KR-102961462-B1 - Secondary battery and battery module having thereof

KR102961462B1KR 102961462 B1KR102961462 B1KR 102961462B1KR-102961462-B1

Abstract

A pouch-type secondary battery according to one embodiment of the present invention comprises: a cell body member having an electrode assembly accommodated therein and provided adjacent to a cooling plate member; and a heat conducting member provided between the cell body member and the cooling plate member, forming a heat path that transfers heat from the cell body member to the cooling plate member, and provided to be in contact with the cooling plate member with a contact area smaller than the maximum cross-sectional area in the thickness direction of the cell body member; wherein the cell body member comprises a tapered portion at one end adjacent to the cooling plate member; and a recessed portion disposed adjacent to the tapered portion; and the heat conducting member may be formed to correspond to the area of a contact surface portion formed in the region excluding the recessed portion at one end of the cell body member.

Inventors

황동하
김석민
마명환
이서로
전해룡
주승훈
최양규

Assignees

에스케이온 주식회사

Dates

Publication Date: 20260508
Application Date: 20190723

Claims (12)

A cell body member having an electrode assembly accommodated therein and provided adjacent to a cooling plate member; and A heat-conducting member provided between the cell body member and the cooling plate member, forming a heat path for transferring heat from the cell body member to the cooling plate member, and configured to contact the cooling plate member with a contact area smaller than the maximum cross-sectional area in the thickness direction of the cell body member; Includes, The above cell body member is, It includes a tapered portion at one end adjacent to the cooling plate member; and a recessed portion disposed adjacent to the tapered portion. The above heat-conducting member is, A secondary battery formed to correspond to the area of the contact surface formed in the region excluding the recess at one end of the cell body member.
In paragraph 1, A secondary battery characterized by an effective area ratio of 30 to 70 percent, which is the percentage ratio of the contact area between the cooling plate member and the heat conductive member relative to the maximum cross-sectional area in the thickness direction of the cell body member.
In paragraph 1, A secondary battery characterized by an effective area ratio of 35 to 50 percent, which is the percentage ratio of the contact area between the cooling plate member and the heat conductive member relative to the maximum cross-sectional area in the thickness direction of the cell body member.
In paragraph 1, The above-mentioned tapered portion is, The shape is such that the cross-sectional area in the thickness direction decreases as it approaches the end portion adjacent to the above cooling plate member, and The above contact surface is, A secondary battery provided at one end of the above-mentioned tapered portion, forming the smallest cross-sectional area in the thickness direction, and located between the above-mentioned recess and the above-mentioned tapered portion.
In paragraph 4, A secondary battery characterized in that the above-mentioned heat-conducting member is in contact with the above-mentioned contact surface and is formed with the same surface area as the above-mentioned contact surface.
In paragraph 5, A secondary battery characterized in that the above-mentioned heat-conducting member is formed with a cross-sectional area identical to the cross-sectional area of the contact surface portion and has a constant thickness up to the cooling plate member.
In paragraph 1, A secondary battery characterized in that the above-described heat-conducting member contacts the central portion of one end of the cell body member adjacent to the above-described cooling plate member, excluding the recessed portion.
In paragraph 1, The cell body member is a secondary battery characterized by having a thickness percentage ratio relative to height of 5 to 25%.
In paragraph 1, The cell body member is a secondary battery characterized by having a thickness percentage ratio relative to height of 7.5 to 10%.
A secondary battery comprising a cell body member in which an electrode assembly is accommodated internally, and a heat conductive member provided between the cell body member and a cooling plate member; and A housing member comprising a cooling plate member that exchanges heat with the cell body member via the heat conducting member, wherein a plurality of the secondary batteries are accommodated therein; Includes, The above heat-conducting member contacts the cooling plate member with a contact area smaller than the maximum cross-sectional area in the thickness direction of the cell body member, and The cell body member includes a tapered portion and a recessed portion at one end adjacent to the cooling plate member, The above-mentioned heat-conducting member is a battery module formed to correspond to the area of a contact surface formed in the region excluding the recess at one end of the cell body member.
In Paragraph 10, The above-mentioned tapered portion is, The shape is such that the cross-sectional area in the thickness direction decreases as it approaches the end portion adjacent to the above cooling plate member, and The above contact surface is, A battery module provided at one end of the tapered portion, forming the smallest cross-sectional area in the thickness direction, and located between the recess and the tapered portion.
In Paragraph 10, A battery module characterized in that the housing member comprises the cooling plate member at least in the bottom portion.

Description

Secondary battery and battery module having thereof The present invention relates to a secondary battery and a battery module including the same. With the increasing technological development and demand for mobile devices and electric vehicles, the demand for secondary batteries as an energy source is rapidly rising. A secondary battery is a battery capable of repeated charging and discharging due to the reversible interconversion between chemical and electrical energy. The cell body component of a secondary battery refers to a multilayer outer material (Laminated Film Case) that protects the electrode assembly, which consists of the main components of the secondary battery, such as the positive electrode, negative electrode, separator, and electrolyte. However, these electrode assemblies generate heat during the charging and discharging process, and the temperature rise caused by this heat degrades the performance of the secondary battery. Accordingly, the cell body member in which the electrode assembly is housed is configured to be connected to a cooling plate member, a heat sink, etc., for performing cooling. However, there was a problem in that the shape of the cell body member cooled in conjunction with the conventional cooling plate member and heat sink, and the shape of the heat conductive member capable of mediating between the cell body member and the cooling plate member, could not optimally form cooling performance. In addition, this has led to the problem of increased production costs due to the waste of expensive thermal conductive materials. Therefore, research on secondary batteries and battery modules containing them to solve the aforementioned problems has become necessary. FIG. 1 is a cross-sectional view illustrating a secondary battery of the present invention. FIG. 2 is a perspective view illustrating a secondary battery of the present invention. Figure 3 is a drawing showing the maximum cross-sectional area of the cell body member and the contact area of the heat-conducting member in Figure 2 overlaid for comparison. FIG. 4 is a cross-sectional view illustrating another embodiment of the cell body member in the secondary battery of the present invention. Figure 5 is a graph for presenting the appropriate thermal resistance of a secondary battery that maintains the appropriate temperature of the secondary battery in relation to the present invention. Figure 6 is a graph showing the effective area ratio of a secondary battery cell for appropriate thermal resistance of the secondary battery of the present invention. Figure 7 is a graph showing the percentage ratio of thickness relative to height of a secondary battery cell for appropriate thermal resistance of the secondary battery of the present invention. FIG. 8 is an exploded perspective view illustrating a battery module of the present invention. Preferred embodiments of the present invention will be described below with reference to the attached drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. In the drawings, the shapes and sizes of elements may be exaggerated for clearer explanation. Additionally, in this specification, singular expressions include plural expressions unless the context clearly indicates otherwise, and throughout the specification, the same reference numerals or reference numerals assigned in a similar manner are deemed to refer to the same component or corresponding component. The present invention relates to a secondary battery (10) and a battery module including the same, which can optimally form cooling performance without wasting the heat-conducting member (30). In other words, the secondary battery (10) of the present invention and the battery module including it present a design form that maintains cooling performance while reducing the amount of heat-conducting material (30) used, so as to reduce production costs while maintaining a cooling effect compared to the prior art. Specifically, referring to the drawings, FIG. 1 is a cross-sectional view illustrating the secondary battery (10) of the present invention, FIG. 2 is a perspective view illustrating the secondary battery (10) of the present invention, and FIG. 3 is a drawing showing the maximum cross-sectional area (A1) of the cell body member (11) and the contact area (A2) of the heat conduction member (30) in FIG. 2 superimposed for comparison. And, FIG. 4 is a cross-sectional view illustrating another embodiment of the cell body member (11) in the secondary battery (10) of the present invention. Referring to the drawings above, a pouch-type secondary battery (10) according to one embodiment of the present invention may include a cell body member (11) which is provided adjacent to