KR-102962066-B1 - Battery cell assembly, battery pack, and vehicle having the same

KR102962066B1KR 102962066 B1KR102962066 B1KR 102962066B1KR-102962066-B1

Abstract

The battery cell assembly of the present invention comprises: a plurality of battery cells each having a positive terminal and a negative terminal; a housing provided to accommodate the plurality of battery cells; and a plurality of holder assemblies each comprising a positive busbar provided to be detachably provided to each of the plurality of battery cells and provided to be electrically connected by contacting the positive terminal, and a negative busbar provided to be connected to the negative terminal.

Inventors

유동원

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20240206

Claims (20)

A plurality of battery cells equipped with a positive terminal and a negative terminal; A housing provided to accommodate the above plurality of battery cells; and A plurality of holder assemblies, each comprising a positive busbar provided to be detachably provided to each of the plurality of battery cells and electrically connected by contacting the positive terminal, and a negative busbar provided to be connected to the negative terminal; The above cathode busbar is, An anode exposure port that exposes a portion of the anode busbar to the outside; A cathode disc portion coupled to the above housing; and A battery cell assembly characterized by including a negative connection portion that is bent downward from the negative disc portion and extends from the negative disc portion to make direct contact with the negative terminal.
In paragraph 1, A battery cell assembly characterized in that the holder assembly is configured such that when the positive terminal and the positive busbar come into contact, the negative busbar and the negative terminal come into contact.
In paragraph 2, A battery cell assembly characterized in that the holder assembly is configured such that when the battery cell is separated from the holder assembly, the positive terminal and the negative terminal are sequentially separated from the positive busbar and the negative busbar.
In paragraph 1, Each of the above plurality of holder assemblies is, A battery cell assembly characterized by including an anode mold that is electrically insulating and coupled such that a portion of the anode busbar is exposed to the outside.
In paragraph 4, A battery cell assembly characterized in that the positive exposure port is coupled with the positive mold and is arranged so that an exposed portion of the positive busbar is exposed to the outside.
In paragraph 5, The above positive busbar is, Anode disc portion located at the bottom of the anode mold; A positive connection unit having a shape protruding toward the positive terminal from the positive disc portion and arranged to elastically press the positive terminal; and A battery cell assembly characterized by including an anode protrusion extending from the anode disc portion so as to be inserted into the anode exposure port.
In paragraph 6, The above positive connection unit is, A body portion that is electrically conductive and is provided to be inserted into the anode mold; A pressure moving part that is electrically conductive, is provided at the lower part of the body part, is in direct contact with the positive terminal, and is configured to be movable in a direction that applies pressure to the positive terminal; and A battery cell assembly characterized by including an elastic member embedded in the body portion and arranged to elastically press the pressure moving portion toward the positive terminal.
In Paragraph 7, The above positive plate portion has at least one through hole formed therein, and The above positive connection unit is, A battery cell assembly characterized by having a stopper provided on the body portion to prevent the above-mentioned pressurized moving portion from moving in the insertion direction while inserted into the through hole.
In Paragraph 7, The above anode mold is, A mold plate portion provided to cover the upper part of the anode plate portion; and A battery cell assembly characterized by including: a mold protrusion that protrudes upward from the mold disc portion to cover the side of the anode protrusion and has an exposure hole formed therein so that the upper part of the anode protrusion of the combined anode busbar is exposed to the outside.
In paragraph 4, A battery cell assembly characterized in that the negative busbar includes a negative convex portion formed convexly in an upward direction from the negative disc portion to form a receiving space in which the positive mold is received.
In Paragraph 10, The cathode connection part is, A connection opening is formed in a part, A battery cell assembly characterized by having a connecting projection formed that extends long from the inner circumference of the above-mentioned connecting opening and is bent so that a portion protrudes toward the negative terminal to enable elastic pressing.
In Paragraph 10, The cathode connection part is, A battery cell assembly characterized by having a connecting convex portion that protrudes toward the negative terminal in part to enable elastic pressure.
In Paragraph 12, The housing is provided with a receiving portion that accommodates a holder assembly, and A battery cell assembly characterized by having a fixing groove formed in the above-mentioned receiving portion so that the negative connection portion of the negative busbar is inserted therein.
In paragraph 1, The above housing is, A battery cell assembly characterized by having an anode opening formed so that the anode busbar is exposed to the outside and a cathode opening formed so that the cathode busbar is exposed to the outside.
In Paragraph 14, The above housing is, An upper cover provided to cover the upper and middle portions of the plurality of battery cells; and A battery cell assembly characterized by including a lower cover provided to cover the lower portion of the plurality of battery cells.
In paragraph 15, A battery cell assembly further comprising a plurality of connecting members mounted on the upper part of the upper cover, each having at least one of a positive contact portion that contacts the positive busbar through the positive opening and a negative contact portion that contacts the negative busbar through the negative opening.
In Paragraph 16, A battery cell assembly characterized in that the above-mentioned negative busbar is embedded in the above-mentioned upper cover through injection molding.
In paragraph 15, The above lower cover is, A battery cell assembly characterized by having a plurality of mounting grooves having a receiving space for accommodating the lower portion of each of the plurality of battery cells.
A battery pack characterized by including at least one battery cell assembly and a battery management system (BMS) according to any one of claims 1 to 18.
A means of transportation characterized by including a battery pack according to paragraph 19.

Description

Battery cell assembly, battery pack, and vehicle having the same The present invention relates to a battery cell assembly, a battery pack, and a means of transportation including the same, and more specifically, to a battery assembly, a battery pack, and a means of transportation including the same in which the maintenance costs of the battery assembly, the battery pack, and the means of transportation including the same can be reduced by facilitating the replacement of individual battery cells. Recently, rechargeable secondary batteries are being widely used as an energy source for wireless mobile devices. Furthermore, secondary batteries are attracting attention as an energy source for electric vehicles and hybrid electric vehicles, which are being proposed as solutions to address air pollution caused by conventional gasoline and diesel vehicles that use fossil fuels. Consequently, the types of applications utilizing secondary batteries are becoming highly diversified due to their advantages, and it is expected that secondary batteries will be applied to a wider range of fields and products in the future than they are today. Generally, secondary batteries may be equipped with multiple battery cells. These battery cells are classified according to the shape of the battery case into cylindrical and prismatic battery cells, in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and pouch-type battery cells, in which the electrode assembly is embedded in a pouch-type case made of an aluminum laminate sheet. The electrode assembly embedded in the battery case is a power generation element capable of charging and discharging, consisting of a positive electrode, a negative electrode, and a separator structure interposed between the positive and negative electrodes. It is classified into a jelly-roll type, which is wound with a separator interposed between long sheet-type positive and negative electrodes coated with active material, and a stack type, in which a plurality of positive and negative electrodes of a predetermined size are sequentially stacked with a separator interposed between them. FIG. 1 is a cross-sectional view schematically showing the welding process of a general battery cell (30) and a bus bar (50). FIG. 2 is a perspective view schematically showing the appearance of a battery cell assembly (40) including battery cells (30) fixed using a conventional adhesive (60). Referring to FIGS. 1 and 2, in the field of high technology, a battery pack (not shown) including a battery cell assembly (or battery cell stack) composed of a plurality of battery cells (30) and a battery management system is used to supply power to various electronic devices. As shown in FIG. 1, the battery cell assembly (40) is generally electrically connected by a method such as resistance welding using a resistance welding rod (20) between the electrode terminals (10) of each of the plurality of battery cells (30) mounted inside and a bus bar (50) in the form of a metal plate. In addition, as shown in FIG. 2, there were cases where the battery cells (30) of a conventional battery cell assembly were fixed using an adhesive (60) (potting resin) or the like inside the outer case (not shown) of the battery cell assembly (40) so that the electrical connection would not be damaged by external impact. However, in the case of a battery cell assembly (40) of this prior art, if problems such as over-discharge, damage, or short circuit occur in some of the battery cells (30) among the multiple battery cells (30) during use, it was difficult to individually replace only the battery cells (30) that had problems. That is, since multiple battery cells (30) are connected to a bus bar (50), when separated from the bus bar (50), damage to the bus bar (50) occurs, and the electrical connection of the normal battery cells (30) is easily disconnected. In addition, in order to separate the battery cells (30) fixed inside the outer case with adhesive (60), the adhesive (60) must be removed, but the cost and time required for the work of removing the adhesive (60) were high, making it inefficient. Therefore, it was inevitable that the battery assembly (40) of the prior art be replaced with a minimum unit, such as a module assembly consisting of several battery cells (30) that are not fixed with adhesive (60), or replaced with a completely new battery cell assembly (40). This replacement method has the problem of increasing maintenance costs for the battery cell assembly (40) and causing environmental pollution, because normal battery cells must be discarded along with defective battery cells, and recycling of the discarded battery cells is difficult. There is a need to develop battery assemblies, battery packs, and means of transportation containing them that can solve these problems. Figure 1 is a cross-sectional view schematically showing the welding process of a typical battery cell and a busbar. FIG. 2 is a schematic