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KR-102964089-B1 - BATTERY MODULE AND METHOD THEREOF

KR102964089B1KR 102964089 B1KR102964089 B1KR 102964089B1KR-102964089-B1

Abstract

A battery module according to one embodiment of the present invention comprises at least one battery cell having a vent portion, a heat dissipation case having a film bonding surface and at least a flow path groove provided at a step with respect to the film bonding surface, and a heat dissipation portion having a cooling flow path through which coolant flows along the at least one flow path groove, wherein the heat dissipation portion may be mounted on the at least one battery cell such that when the battery cell ignites internally, the heat dissipation film is damaged by the opening pressure of the vent portion, and the coolant flows down from the cooling flow path to the battery cell through the damaged portion.

Inventors

  • 정민용
  • 최범
  • 금종윤
  • 안수준
  • 정재헌

Assignees

  • 주식회사 엘지에너지솔루션

Dates

Publication Date
20260512
Application Date
20220104

Claims (20)

  1. At least one battery cell having a vent portion; and A heat dissipation unit comprising a heat dissipation case having a film bonding surface and at least a flow path groove provided with a step difference with respect to the film bonding surface, and a heat dissipation film bonded to the film bonding surface of the heat dissipation case to cover the flow path groove, thereby providing a cooling flow path through which cooling water flows along the at least one flow path groove. A battery module characterized in that the above-mentioned heat dissipation part is mounted on at least one battery cell such that, in the event of internal ignition of the battery cell, the heat dissipation film is damaged by the opening pressure of the above-mentioned vent part, and the coolant flows down from the cooling path to the battery cell through the damaged part.
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  3. In Article 1, A battery module characterized in that the above-mentioned heat dissipation film is a thin film having heat dissipation and insulation properties and a thickness in the micrometer (㎛) range.
  4. In Article 1, A battery module characterized in that the above-mentioned heat dissipation film is a film in which a polymer resin film is compressed onto an aluminum film.
  5. In Article 1, A battery module characterized in that the above-mentioned heat dissipation film is a film formed by laminating and pressing a polypropylene (PP) film, an aluminum film, a nylon film, and a PET film.
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  7. In Article 1, A battery module characterized in that the above-mentioned at least one Euro home includes a reference home and at least one branch home branched from the reference home.
  8. In Article 7, A battery module characterized in that at least one branch groove is parallel to the arrangement direction of the battery cell, is connected to the reference groove, but is partitioned from one another.
  9. In claim 7, the heat dissipation part is, A port installed in the heat dissipation case so as to be in communication with the above reference groove; and A battery module characterized by further including a cooling unit connected to the above port and supplying or recovering coolant through the above port.
  10. In Article 9, A battery module characterized by the above-mentioned port being joined to the heat dissipation case by any one of an adhesive, a heterogeneous bonding method, or a bolting method.
  11. In Article 9, A battery module characterized in that the gap between the above port and the heat dissipation case is sealed by a sealing member.
  12. In Article 1, The above-mentioned heat dissipation case is a battery module characterized by being injection-molded from synthetic resin by a vacuum injection molding process.
  13. In Article 12, A battery module characterized in that the above synthetic resin is a polypropylene (PP)-based resin.
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Description

Battery Module and Method of Manufacturing Battery Module The present invention relates to a battery module, and more specifically, to a battery module and a method for manufacturing a battery module in which, when an internal fire occurs in a battery cell, the heat dissipation film of the heat dissipation part is torn by the pressure of the vent part of the battery cell opening, and coolant flows down into the battery cell through the torn heat dissipation film, thereby suppressing the flame of the ignited battery cell at an early stage and preventing continuous fire of the battery cell. Basically, the battery module (10) has a structure in which a heat sink (12) is attached to at least one battery cell (11). The heat sink (12) is formed by attaching aluminum plates to each other by a brazing method, or is composed of aluminum plates and plastic plates attached by a heterogeneous bonding method. Generally, the battery cell (11) has a vent (11a) at the bottom. When ignition occurs inside the battery cell, the vent (11a) opens due to the internal pressure of the battery cell, and flames are ejected to the outside of the battery cell (11). However, when the lower part of the battery cell is attached to the heat sink (12), if ignition occurs inside the battery cell, the heat sink blocks the vent of the battery cell, so the vent does not open when the battery cell (11) ignites. If the vent (11a) of the battery cell cannot open, the internal pressure of the battery cell continues to increase, and eventually, the internal pressure of the battery cell generated by the flame tears the side of the battery cell and ejects out through the side of the battery cell. There was a problem where flames ejected from the side of the battery cell (11) were transferred to adjacent battery cells, causing a chain reaction of ignition. FIG. 1 is a drawing for explaining lateral ignition when a battery cell ignites in a battery module according to the prior art. FIG. 2 schematically illustrates a perspective view of a battery module according to one embodiment of the present invention. FIG. 3 schematically illustrates a cross-sectional view of a battery module according to one embodiment of the present invention. FIG. 4 schematically illustrates a cross-sectional view of the combination of a heat dissipation case and a heat dissipation film according to one embodiment of the present invention. FIG. 5 schematically illustrates a cross-section of a heat dissipation film according to one embodiment of the present invention. FIG. 6 schematically illustrates a cross-sectional view of the combination of a heat dissipation unit and a battery cell according to one embodiment of the present invention. FIG. 7 is a diagram illustrating the process of suppressing the flame of a battery cell by discharging cooling water from a heat dissipation part when an internal ignition of one battery cell occurs in a battery module according to one embodiment of the present invention. FIGS. 8 and 9 are drawings for explaining a method for manufacturing a battery module according to an embodiment of the present invention. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present application to specific embodiments and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present application. In describing the present application, detailed descriptions of related prior art are omitted if it is determined that such detailed descriptions may obscure the essence of the present application. Terms such as "first," "second," etc., may be used to describe various components, but components should not be limited by these terms. The terms are used solely for the purpose of distinguishing one component from another. The terms used in this application are used merely to describe specific embodiments and are not intended to limit this application. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Therefore, the configurations illustrated in the embodiments described in this specification are merely the most preferred embodiments of this application and do not represent all of the technical ideas of this application; thus, various equivalents and modifications that can replace them may exist at the time of filing this application. In addition, the drawings attached to this application should be understood as being en