KR-102963878-B1 - BATTERY MODULE AND BATTERY PACK INCLUDING THE SAME

Abstract

A battery module according to one embodiment of the present invention comprises at least one battery cell assembly including a plurality of cylindrical battery cells arranged with their sides adjacent to each other, a case for housing the battery cell assembly, a fixing resin layer disposed on at least one side of the longitudinal end of the plurality of cylindrical battery cells and fixing the plurality of cylindrical battery cells, and a heat transfer resin layer formed between the fixing resin layer and the case and in contact with the fixing resin layer and the case.

Inventors

• 김희규
• 최범
• 최승빈

Assignees

• 주식회사 엘지에너지솔루션

Dates

Publication Date

20260511

Application Date

20210729

Claims (11)

1. At least one battery cell assembly comprising a plurality of cylindrical battery cells arranged with their sides adjacent to each other; A case for housing the above battery cell assembly; A fixing resin layer disposed on at least one side of the longitudinal end of the plurality of cylindrical battery cells and fixing the plurality of cylindrical battery cells; and It includes a heat transfer resin layer formed between the fixed resin layer and the case and in contact with the fixed resin layer and the case, and The above battery cell assembly further includes an intermediate case that surrounds the sides of the plurality of cylindrical battery cells, and The above case is positioned on the outer side of the intermediate case and is formed to correspond to the longitudinal end and the side of the plurality of cylindrical battery cells, and The above heat transfer resin layer is a battery module formed between the intermediate case and the case.
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4. In paragraph 1, The above case is in the form of a tube with the top and bottom each open, and a battery module in which an upper cover and a lower cover are attached to the top and bottom respectively.
5. In Paragraph 4, The above upper cover is a battery module comprising a plurality of resin injection holes for injecting a heat transfer resin to form the heat transfer resin layer.
6. In paragraph 5, The plurality of resin injection holes are battery modules formed adjacent to the case.
7. In Paragraph 4, A battery module comprising at least one first projection portion that is inserted into and coupled to the inner side of the case and protrudes toward the case from the side of the upper cover.
8. In paragraph 1, The above intermediate case is a battery module comprising at least one second projection protruding from the outer surface of the intermediate case toward the case.
9. In paragraph 1, The above case is a battery module comprising at least one third projection protruding from the inner surface of the case toward the intermediate case.
10. In Paragraph 4, The upper cover is inserted into and coupled to the inside of the case, and The above case is a battery module comprising at least one fourth projection protruding from the inner surface of the case toward the upper cover.
11. A battery pack comprising at least one battery module according to any one of claims 1, 4 to 10.

Description

Battery module and battery pack including the same The present invention relates to a battery module including a cylindrical battery cell and a battery pack including the same, and in particular to a battery module capable of efficiently dissipating heat generated in the battery cell to the outside and a battery pack including the same. Recently, with rising energy prices due to the depletion of fossil fuels and growing concern over environmental pollution, the demand for eco-friendly alternative energy sources is becoming an indispensable factor for future life. Accordingly, research on various power generation technologies, such as nuclear, solar, wind, and tidal power, is continuing, and significant interest is also being shown in power storage devices to utilize this generated energy more efficiently. Furthermore, as technological development and demand for mobile devices and electric vehicles increase, the demand for batteries as energy sources is rapidly rising, and accordingly, extensive research is being conducted on batteries capable of meeting various requirements. In particular, regarding materials, there is high demand for lithium-ion batteries, such as lithium-ion polymer batteries, which possess advantages like high energy density, discharge voltage, and output stability. Secondary batteries are classified according to the structure of the electrode assembly, which consists of a stacked structure comprising a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes. Representative examples include the jelly-roll type (wound type) electrode assembly, which consists of long sheet-type positive and negative electrodes wound with a separator interposed, and the stack type (stacked type) electrode assembly, which consists of multiple positive and negative electrodes cut into units of a predetermined size and sequentially stacked with a separator interposed. Recently, to address the problems associated with the jelly-roll type and stack type electrode assemblies, an advanced electrode assembly structure—a hybrid of the jelly-roll and stack types—has been developed. This stack/folding type electrode assembly consists of unit cells, each containing a predetermined number of positive and negative electrodes stacked with a separator interposed, positioned on a separator film and sequentially wound. Depending on the intended use, these electrode assemblies are housed in pouch cases, cylindrical cans, prismatic cases, etc., to manufacture batteries. Among these, cylindrical batteries have the advantages of being easy to manufacture and having a high energy density per unit weight, so they are used as energy sources for various devices ranging from portable computers to electric vehicles. In addition, battery modules containing multiple cylindrical batteries can be used as energy sources for small vehicles, etc. However, in the case of a battery module containing multiple cylindrical cells as described above, the energy density is high, and therefore, it is necessary to dissipate the heat generated within the cells more efficiently to the outside. To this end, conventional methods have assembled numerous components for heat dissipation. However, in this case, there is a problem in that the large number of components inside the pack actually increases thermal resistance, making it impossible to achieve a sufficient heat dissipation effect. FIG. 1 is a drawing illustrating a battery module according to one embodiment of the present invention. Figure 2 is a drawing showing the state of the battery module case of Figure 1 before assembly. Figure 3 is a cross-sectional view of part A of Figure 1. Figure 4 is a drawing showing the upper surface of Figure 1. Figure 5 is a diagram illustrating a method of injecting a heat transfer resin to form a heat transfer resin layer in the battery module of Figure 1. FIG. 6 is an enlarged view of a portion corresponding to part C of FIG. 4 in another embodiment of the present invention. FIG. 7 is a cross-sectional view of a portion corresponding to portion B of FIG. 1 in another embodiment of the present invention. FIGS. 8A and FIGS. 8B are drawings illustrating a cross-section of a portion corresponding to part B of FIG. 1 and a portion corresponding to part C of FIG. 4, respectively, in another embodiment of the present invention. Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification. Furthermore, the size and thickness of each component shown in the dra