Battery cell and battery module including the same

Abstract

A battery cell according to an embodiment of the present invention may include an electrode assembly, a battery case that houses the electrode assembly, electrode leads connected to the electrode assembly and protruding to the outside of the battery case, and a heat-insulating case that houses the battery case and has a slit through which the electrode leads pass.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0124726, filed on September 29, 2022, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a battery cell for effectively preventing heat propagation, and a battery module including the same. [Background technology]

[0003] Secondary batteries that can be charged and discharged do not require replacement of battery cells, making them suitable for use as internal battery cells. As the stability and capacity of secondary batteries have been rapidly improved, they are being applied to a variety of devices.

[0004] For example, secondary batteries are widely used as energy sources for wireless mobile devices, which are small multi-functional products, or wearable devices worn on the body, as well as for energy sources and energy storage systems (ESS) for electric vehicles and hybrid electric vehicles, which are presented as alternatives to conventional gasoline and diesel vehicles that cause air pollution.

[0005] In particular, in order to use secondary batteries as large-capacity, high-power energy sources, battery modules including multiple battery cells and battery packs including multiple battery modules are used. As secondary batteries are used as large-capacity, high-power energy sources, ensuring the safety of secondary batteries has become a major concern.

[0006] Conventionally, to prevent the lifespan of secondary batteries from being rapidly shortened due to temperature when used for long periods of time, cooling systems have been designed based on the amount of heat generated by the secondary battery's operating environment and the reliable operating temperature. However, if a single battery cell in a battery module or battery pack exceeds its critical temperature due to abnormal heat generation, thermal runaway (TR) may occur, leading to thermal propagation (TP) to surrounding battery cells. This can lead to safety issues such as fire.

[0007] Conventionally, heat insulating plates have been placed between battery cells to prevent such heat propagation, but because gases and flames generated in the battery cells tend to bypass the heat insulating plates, there is a limit to how well they can delay or prevent thermal runaway. Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a battery cell that can effectively delay or prevent heat propagation, and a battery module including the same. [Means for solving the problem]

[0009] A battery cell according to an embodiment of the present invention may include an electrode assembly, a battery case that houses the electrode assembly, electrode leads connected to the electrode assembly and protruding to the outside of the battery case, and a heat-insulating case that houses the battery case and has a slit through which the electrode leads pass.

[0010] The slit may extend parallel to the entire width direction of the battery case.

[0011] One side of the heat insulating case may be open.

[0012] The slit may be connected to one open surface of the insulating case.

[0013] The heat insulating case may include at least one material selected from the group consisting of mica, aerogel, and silicon.

[0014] The thickness of the heat insulating case may be equal to or greater than the thickness of the battery case.

[0015] The heat insulating case may have a vent hole formed on a surface different from the surface on which the slit is formed.

[0016] The heat-insulating case may include an elastic layer made of an elastic material, and a heat-insulating layer laminated on the elastic layer and having higher heat-insulating properties than the elastic layer.

[0017] The elastic layer may include a polyurethane material.

[0018] The thickness of one side of the heat insulating case may be thinner than the thickness of the other side of the heat insulating case.

[0019] A battery module according to an embodiment of the present invention may include a case, a plurality of battery cells housed in the case, and a heat sink for dissipating heat from the plurality of battery cells. At least some of the plurality of battery cells may include an electrode assembly, a battery case housing the electrode assembly, electrode leads connected to the electrode assembly and protruding outside the battery case, and a heat insulating case housing the battery case and having slits through which the electrode leads pass.

[0020] One side of the heat insulating case is open, and the battery case can be in contact with the heat sink through the open side of the heat insulating case.

[0021] One surface of the heat insulating case may be in contact with the heat sink, and the thickness of the one surface of the heat insulating case may be thinner than the thickness of the other surface of the heat insulating case.

[0022] The heat insulating case may have a vent hole formed on the opposite side of the heat sink.

[0023] A battery cell according to an embodiment of the present invention may include an electrode assembly, a battery case that houses the electrode assembly, and a thermal insulation layer that is coated on an outer surface of the battery case and has a thickness at least partially equal to or greater than a thickness of the battery case.

[0024] The outer surface of the battery case may include a first region coated with the heat insulating layer and a second region that is not coated with the heat insulating layer or is coated with the heat insulating layer at a thickness thinner than that of the first region.

[0025] A battery module according to an embodiment of the present invention may include a case, a plurality of battery cells housed in the case, and a heat sink for dissipating heat from the plurality of battery cells. At least some of the plurality of battery cells may include an electrode assembly, a battery case accommodating the electrode assembly, and a heat insulating layer coated on an outer surface of the pouch-shaped battery case, the heat insulating layer having a thickness equal to or greater than the thickness of the battery case.

[0026] The outer surface of the battery case may include a first region coated with the thermal insulating layer and a second region not coated with the thermal insulating layer and in contact with the heat sink.

[0027] The outer surface of the battery case includes a first region coated with the insulating layer and a second region coated with the insulating layer at a thickness thinner than that of the first region, and the insulating layer coated in the second region can contact the heat sink. [Effects of the Invention]

[0028] According to a preferred embodiment of the present invention, an insulating case or insulating layer can delay or prevent heat propagation to other surrounding battery cells or the spread of fire even if thermal runaway and fire occur in one battery cell.

[0029] Furthermore, by making the thickness of the heat insulating case or heat insulating layer equal to or greater than the thickness of the battery case, a sufficient heat insulating effect can be ensured.

[0030] In addition, by making the portion of the insulating case or insulating layer that comes into contact with the heat sink open or thin, it is possible to prevent the insulating case or insulating layer from reducing the heat dissipation performance of the battery cell, and to enable the battery cell to dissipate heat effectively.

[0031] Other effects that can be easily predicted by a person skilled in the art from the configurations according to the preferred embodiments of the present invention can also be included. [Brief explanation of the drawings]

[0032] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical concept of the present invention. Therefore, the present invention should not be interpreted as being limited only to the matters shown in these drawings. [Figure 1] 1 is an exploded perspective view of a battery module according to an embodiment of the present invention; [Figure 2] FIG. 1 is an exploded perspective view of a battery cell according to an embodiment of the present invention. [Figure 3] FIG. 1 is a perspective view of a battery cell according to an embodiment of the present invention. [Figure 4] 1 is a cross-sectional view of a battery cell according to an embodiment of the present invention. [Figure 5] FIG. 5 is a cross-sectional view showing a modified example of the battery cell shown in FIG. [Figure 6] FIG. 10 is a perspective view of a battery cell according to another embodiment of the present invention. [Figure 7] FIG. 10 is a cross-sectional view of a battery cell according to another embodiment of the present invention. [Figure 8] FIG. 10 is a perspective view of a battery cell according to yet another embodiment of the present invention. [Figure 9] FIG. 10 is a cross-sectional view of a battery cell according to yet another embodiment of the present invention. [Figure 10] FIG. 10 is a cross-sectional view showing a modified example of the battery cell shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0033] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily understand the preferred embodiments of the present invention. However, the present invention may be realized in various different forms and is not limited to the following embodiments.

[0034] In order to clearly explain the present invention, detailed descriptions of parts that are not relevant to the explanation or related known technologies that may obscure the gist of the present invention will be omitted, and in this specification, when adding reference symbols to components in each drawing, the same or similar reference symbols will be used throughout the specification to refer to the same or similar components.

[0035] Furthermore, the terms and words used in this specification and claims should not be interpreted in a limited way to their ordinary and dictionary meanings, but should be interpreted in a way that is consistent with the technical idea of ​​the present invention, in accordance with the principle that an inventor can appropriately define the concept of a term in order to best explain his or her invention.

[0036] FIG. 1 is an exploded perspective view of a battery module according to one embodiment of the present invention.

[0037] A battery module 1 according to one embodiment of the present invention can include a case 10, a plurality of battery cells 100 housed in the case 10, and a heat sink 30 that dissipates heat from the plurality of battery cells 100.

[0038] The case 10 may form the exterior of the battery module 1. The case 10 may be substantially box-shaped. The case 10 may have an internal space. For example, the case 10 may include a body 11 having both open ends and end plates 12 that cover both open ends of the body 11.

[0039] The main body 11 can extend in the overall length direction of the battery cells 100 (for example, the direction aligned with the X-axis in FIG. 1), which will be described later. In the following, an example will be described in which the overall length direction of the battery cells 100 (for example, the direction aligned with the X-axis) is aligned in the front-to-rear direction.

[0040] The main body 11 may form the top, bottom, and both side surfaces of the case 10. The front and back surfaces of the main body 11 may be open. A cell stack 20, in which a plurality of battery cells 100 are stacked, may be accommodated in the internal space of the main body 11 through the open front or back surface of the main body 11.

[0041] The main body 11 may be formed as a single unit, but is not limited thereto, and may of course be formed by joining a plurality of plates together.

[0042] The end plates 12 may be provided in pairs. When the cell stack 20 is housed in the main body 11, the end plates 12 may cover the open front and rear surfaces of the main body 11. The end plates 12 may be fastened to the main body 11.

[0043] A plurality of battery cells 100 may be stacked side by side to form a cell stack 20. The plurality of battery cells 100 may be stacked side by side in the thickness direction (for example, the direction aligned with the Y axis).

[0044] The cell stack 20 may be provided with a bus bar frame on which bus bars are provided to electrically connect the electrode leads 115 (see FIG. 2 ) of the plurality of battery cells 100. For example, the electrode leads 115 of each battery cell 100 may protrude from both sides in the overall length direction of the battery cell 100. In this case, the bus bar frames may be provided at both ends in the overall length direction of the cell stack 20, and the end plates 12 may cover the bus bar frames.

[0045] The plurality of battery cells 100 can be in contact with the heat sink 30. Therefore, the heat sink 30 can effectively dissipate heat from the plurality of battery cells 100.

[0046] The heat sink 30 may be disposed on the case 10, more specifically, on the inner bottom surface of the main body 11. However, this is not limiting, and it goes without saying that the case 10, more specifically, the bottom surface of the main body 11 may also function as the heat sink 30.

[0047] FIG. 2 is an exploded perspective view of a battery cell according to one embodiment of the present invention, FIG. 3 is a perspective view of a battery cell according to one embodiment of the present invention, and FIG. 4 is a cross-sectional view of a battery cell according to one embodiment of the present invention.

[0048] A battery cell 100 according to one embodiment of the present invention may include an electrode assembly 110 (see FIG. 4), an electrode lead 115, a battery case 120, and a heat insulating case .

[0049] The electrode assembly 110 may be formed by alternately stacking positive and negative electrodes with separators sandwiched between them. That is, the electrode assembly 110 may include a plurality of electrodes and separators interposed between the electrodes to insulate the electrodes from each other. The electrode assembly 110 may be housed in a battery case 120. The electrode assembly 110 may be of a stack type, a jelly roll type, a stack and folding type, or the like, but is not limited thereto.

[0050] The electrode assembly 110 may include electrode tabs connected to electrode leads 115, which will be described later. The electrode tabs may be formed by cutting the uncoated portions of the positive and negative electrodes, or by connecting a separate conductive member to the uncoated portions.

[0051] The electrode lead 115 may be connected to the electrode assembly 110, more specifically, to an electrode tab. The electrode lead 115 may protrude to the outside of the battery case 120. A pair of electrode leads 115 may be provided, electrically connected to a positive electrode and a negative electrode. For example, the pair of electrode leads 115 may protrude from both sides in the overall length direction of the battery cell 100. However, the present invention is not limited thereto, and it goes without saying that the pair of electrode leads 115 may protrude in the same direction in the overall length direction of the battery cell 100.

[0052] The battery case 120 can accommodate the electrode assembly 110 .

[0053] Hereinafter, the battery case 120 will be described as a pouch-shaped battery case formed by molding a laminate sheet, but the present invention is not limited to this.

[0054] The battery case 120 may have a pocket-shaped cup portion 121 formed in at least one of a pair of cases connected by a bridge 123. When the bridge 123 is folded with the electrode assembly 110 accommodated in the cup portion 121, the pair of cases may be joined together to form a seal portion 122.

[0055] The sealing portion 122 may be formed along the edge of the cup portion 121. A portion of the sealing portion 122 opposite the bridge 123 may be side-folded at least once, preferably double-side folded (DSF). The electrode lead 115 may protrude to the outside through the unfolded sealing portion 122. The construction of a pouch-type battery case is well known, and a detailed description thereof will be omitted.

[0056] The heat insulating case 130 can accommodate the battery case 120. The heat insulating case 130 can have a substantially box shape, but is not limited thereto.

[0057] The heat insulating case 130 may include a material having higher heat insulating properties than the battery case 120. For example, the heat insulating case 130 may include at least one of mica, aerogel, and silicon.

[0058] As a result, even if thermal runaway and fire occur in one battery cell 100, the heat insulating case 130 can delay or prevent the heat from spreading to other surrounding battery cells 100 and the fire from spreading.

[0059] The thickness t2 of the heat insulating case 130 may be equal to or greater than the thickness t1 of the battery case 120. This ensures that the heat insulating effect of the heat insulating case 130 is sufficient.

[0060] One side (for example, the bottom side) of the heat insulating case 130 may be open. More specifically, at least a portion of one side of the heat insulating case 130 may be open to form an open portion 133.

[0061] The open side of the heat insulating case 130 faces the heat sink 30 and can be covered by the heat sink 30 .

[0062] The battery case 120 can be in contact with the heat sink 30 through one open surface of the heat insulating case 130. Preferably, the bridge 123 of the battery case 120 and its periphery can be in contact with the heat sink 30 through one open surface of the heat insulating case 130. This prevents the heat dissipation performance of the battery cells 100 from being reduced by the heat insulating case 130, and allows the battery cells 100 to dissipate heat effectively.

[0063] The heat insulating case 130 may have slits 131 through which the electrode leads 115 pass. Thus, the electrode leads 115 of the battery cells 100 may be easily connected to the outside through the slits 131.

[0064] The slit 131 may be connected to one open side of the insulating case 130. More specifically, the slit 131 may extend parallel to the entire width direction of the battery case 120 (e.g., a direction aligned with the Z axis), and one end of the slit 131 may be open. Therefore, when the battery case 120 is housed in the insulating case 130 through the open side of the insulating case 130, the electrode lead 115 may be easily inserted into the slit 131.

[0065] The heat insulating case 130 may have vent holes 132 formed on a surface (e.g., the top surface) different from the surface (e.g., the front and rear surfaces) on which the slits 131 are formed. Therefore, it is possible to minimize the influence of gas discharged from the vent holes 132 on the electrode leads 115 inserted into the slits 131.

[0066] In addition, the vent holes 132 may be formed on a surface (e.g., the top surface) of the heat insulating case 130 that is different from the surface (e.g., both side surfaces) facing the other battery cells 100. Therefore, the influence of gas discharged from the vent holes 132 on the other battery cells 100 can be minimized.

[0067] The vent holes 132 may be formed on a surface (e.g., a top surface) opposite to an open surface (e.g., a bottom surface) of the heat insulating case 130. That is, the vent holes 132 may be formed on the side opposite the heat sink 30.

[0068] The area of ​​the vent hole 132 may be larger than the area of ​​the slit 131. As a result, when the internal pressure of the heat insulating case 130 rises suddenly due to gas generated by thermal runaway or fire inside the heat insulating case 130, the gas can be preferentially and quickly discharged through the vent hole 132. The vent hole 132 is normally closed by a cover, and may be configured to break the cover and open the vent hole 132 when the internal pressure of the heat insulating case 130 rises above a set value.

[0069] Meanwhile, although not shown in the drawings, some of the plurality of battery cells included in the battery module 1 may not include the heat insulating case 130. For example, among the plurality of battery cells, the battery cells 100 including the heat insulating case 130 and the battery cells not including the heat insulating case 130 may be arranged alternately.

[0070] FIG. 5 is a cross-sectional view showing a modified example of the battery cell shown in FIG.

[0071] According to a modified example, the insulating case 130 of the battery cell 100 may have a multi-layer structure made of different materials. More specifically, the insulating case 130 may have an elastic layer 130a made of an elastic material and an insulating layer 130b laminated on the elastic layer 130a and having higher insulating properties than the elastic layer 130a.

[0072] The elastic layer 130a may be laminated on the inner side of the heat insulating layer 130b, but is not limited to this. For example, the elastic layer 130a may be laminated between a pair of heat insulating layers 130b.

[0073] The elastic layer 130a may include a material with a high elastic modulus. For example, it may include a polyurethane material. The elastic layer 130a can cushion impacts applied from outside the battery cell 100 and protect the battery case 120 and the electrode assembly 110 housed therein. In addition, it can minimize deformation of the insulating case 130 due to swelling of the battery case 120.

[0074] The heat insulating layer 130b may be laminated on the elastic layer 130a. An adhesive layer may be provided between the heat insulating layer 130b and the elastic layer 130a. Alternatively, the heat insulating layer 130b may be formed by coating on the surface of the elastic layer 130a.

[0075] The heat insulating layer 130b may include a material having higher heat insulating properties than the battery case 120. For example, the heat insulating layer 130b may include at least one of mica, aerogel, and silicon.

[0076] To ensure a sufficient insulating effect of the insulating layer 130b, the thickness of the insulating layer 130b may be equal to or greater than the thickness of the battery case 120. When there are multiple insulating layers 130b, the sum of the thicknesses of the multiple insulating layers 130b may be equal to or greater than the thickness of the battery case 120.

[0077] FIG. 6 is a perspective view of a battery cell according to another embodiment of the present invention, and FIG. 7 is a cross-sectional view of a battery cell according to another embodiment of the present invention.

[0078] Hereinafter, the same content as in the above-described embodiment will be used, and the differences will be mainly described.

[0079] The heat insulating case 130 of the battery cell 100' according to another embodiment of the present invention may include a surface 134 that contacts the heat sink 30. The surface 134 may form the bottom surface of the heat insulating case 130.

[0080] The one surface 134 may be prepared separately from the other surfaces of the heat insulating case 130 and may be provided to cover the opening 133. However, the present invention is not limited to this, and the one surface 134 may be formed integrally with the other surfaces of the heat insulating case 130.

[0081] As a result, the battery case 120 is completely surrounded by the insulating case 130, so that when thermal runaway or a fire occurs in one battery cell 100', the propagation of heat to other battery cells 100' or the spread of flames can be delayed or prevented with even higher reliability.

[0082] Meanwhile, the battery case 120 can release heat to the heat sink 30 through the surface 134 of the heat insulating case 130. Preferably, the bridge 123 of the battery case 120 and its periphery can be in contact with the surface 134 of the heat insulating case 130, and the surface 134 can be in contact with the heat sink 30.

[0083] In order to minimize the reduction in heat dissipation performance due to the one surface 134 of the heat insulating case 130, the thickness t3 of the one surface 134 may be thinner than the thickness t2 of the other surface of the heat insulating case 130.

[0084] FIG. 8 is a perspective view of a battery cell according to still another embodiment of the present invention, and FIG. 9 is a cross-sectional view of a battery cell according to still another embodiment of the present invention.

[0085] Hereinafter, the same content as in the above embodiment will be omitted, and the differences will be mainly described.

[0086] A battery cell 100″ according to yet another embodiment of the present invention may include a heat insulating layer 140 coated on the outer surface of the battery case 120 instead of the heat insulating case 130. Therefore, compared to the above-described embodiment, there is no need to prepare the heat insulating case 130, which has the advantage of simplifying the manufacturing process.

[0087] To ensure a sufficient heat insulating effect of the heat insulating layer 140, the thickness t4 of at least a portion of the heat insulating layer 140 can be equal to or greater than the thickness t1 of the battery case 120.

[0088] As a result, even if thermal runaway and fire occur in one battery cell 100'', the heat insulating layer 140 can delay or prevent heat from spreading to other surrounding battery cells 100'' and the spread of the fire.

[0089] The outer surface of the battery case 120 may include a first region 120a coated with the thermal insulating layer 140 and a second region 120b not coated with the thermal insulating layer 140. The second region 120b may be in contact with the heat sink 30.

[0090] For example, the second region 120b may be the bottom surface of the battery case 120. More specifically, the second region 120b may be the outer surface of the bridge 123 and its periphery, and the first region 120a may be the remaining outer surface excluding the second region 120b.

[0091] This prevents the heat dissipation performance of the battery cell 100'' from being reduced by the heat insulating layer 140, and allows the battery cell 100'' to dissipate heat effectively.

[0092] Meanwhile, although not shown in the drawings, some of the plurality of battery cells included in the battery module 1 may not include the thermal insulating layer 140. For example, among the plurality of battery cells, battery cells 100'' including the thermal insulating layer 140 and battery cells not including the thermal insulating layer 140 may be arranged alternately.

[0093] FIG. 10 is a cross-sectional view showing a modified example of the battery cell shown in FIG.

[0094] According to a variant, the heat insulating layer 140 of the battery cell 100 ″ can be coated over substantially the entire outer surface of the battery case 120 .

[0095] In this case, the outer surface of the battery case 120 may include a first region 120a coated with the heat insulating layer 140 and a second region 120b coated with the heat insulating layer 140 at a thickness thinner than that of the first region 120a. The heat insulating layer 140 coated in the second region 120b may contact the heat sink 30.

[0096] More specifically, the thickness t5 of the thermal insulation layer 140 coated in the second region 120b may be thinner than the thickness t4 of the thermal insulation layer 140 coated in the first region 120a, thereby minimizing the reduction in heat dissipation performance due to the thermal insulation layer 140 coated in the second region 120b.

[0097] The above description is merely an illustrative example of the technical concept of the present invention, and various modifications and variations may be made by a person having ordinary skill in the art to which the present invention pertains without departing from the essential characteristics of the present invention.

[0098] Therefore, the embodiments disclosed in the present invention are for illustrative purposes only and are not intended to limit the technical idea of ​​the present invention, and the scope of the technical idea of ​​the present invention is not limited by such embodiments.

[0099] The scope of protection of the present invention should be interpreted by the appended claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0100] 1 Battery Module 10 cases 20 cell stack 30 Heatsink 100 battery cells 110 Electrode assembly 115 Electrode Lead 120 Battery Case 130 Insulated Case 131 Slit 132 Vent Hole 133 Open area 140 Insulation Layer

Claims

1. an electrode assembly; a battery case that houses the electrode assembly; an electrode lead connected to the electrode assembly and protruding to the outside of the battery case; a heat-insulating case that houses the battery case and has a slit through which the electrode lead passes.

2. The battery cell according to claim 1 , wherein the slit extends parallel to the entire width direction of the battery case.

3. The battery cell according to claim 1 , wherein one side of the insulating case is open.

4. The battery cell according to claim 3 , wherein the slit is connected to one open surface of the insulating case.

5. The battery cell according to claim 1 , wherein the insulating case includes at least one material selected from the group consisting of mica, aerogel, and silicon.

6. The battery cell according to claim 1 , wherein the thickness of the insulating case is equal to or greater than the thickness of the battery case.

7. The battery cell according to claim 1 , wherein the heat insulating case has a vent hole formed on a surface different from the surface on which the slit is formed.

8. The heat insulating case is an elastic layer having an elastic material; The battery cell according to claim 1 , further comprising: a heat insulating layer laminated on the elastic layer and having higher heat insulating properties than the elastic layer.

9. The battery cell of claim 8 , wherein the elastic layer comprises a polyurethane material.

10. The battery cell according to claim 1 , wherein the thickness of one side of the insulating case is thinner than the thickness of the other side of the insulating case.

11. Case and a plurality of battery cells housed in the case; a heat sink that dissipates heat from the plurality of battery cells, At least some of the plurality of battery cells an electrode assembly; a battery case that houses the electrode assembly; an electrode lead connected to the electrode assembly and protruding to the outside of the battery case; a heat-insulating case that houses the battery case and has a slit through which the electrode lead passes.

12. One side of the heat insulating case is open, The battery module according to claim 11 , wherein the battery case contacts the heat sink through an open surface of the insulating case.

13. One surface of the heat insulating case is in contact with the heat sink, The battery module according to claim 11 , wherein the thickness of the one surface of the heat insulating case is thinner than the thickness of the other surface of the heat insulating case.

14. The battery module according to claim 11 , wherein the heat insulating case has a vent hole formed on a side opposite to the heat sink.

15. an electrode assembly; a battery case that houses the electrode assembly; a heat insulating layer coated on the outer surface of the battery case, the thickness of at least a portion of which is equal to or greater than the thickness of the battery case.

16. The outer surface of the battery case is a first region coated with the heat insulating layer; a second region in which the thermal insulating layer is not coated or is coated with a thickness thinner than that of the first region.

17. Case and a plurality of battery cells housed in the case; a heat sink that dissipates heat from the plurality of battery cells, At least some of the plurality of battery cells an electrode assembly; a pouch-shaped battery case that accommodates the electrode assembly; a heat insulating layer coated on the outer surface of the battery case, the thickness of at least a portion of which is equal to or greater than the thickness of the battery case.

18. The outer surface of the battery case is a first region coated with the heat insulating layer; 18. The battery module of claim 17, further comprising: a second region where the thermal insulating layer is not coated and contacts the heat sink.

19. The outer surface of the battery case is a first region coated with the heat insulating layer; a second region in which the heat insulating layer is coated to a thickness thinner than that of the first region; The battery module according to claim 17 , wherein the heat insulating layer coated on the second region contacts the heat sink.

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