Battery cell and battery module including same

Abstract

A battery cell according to an embodiment of the present invention may comprise: an electrode assembly; a battery case accommodating the electrode assembly; an electrode lead connected to the electrode assembly and protruding to the outside of the battery case; and a heat-insulating case that accommodates the battery case and has a slit through which the electrode lead passes.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2022-0124726, filed on September 29, 2022, and all contents disclosed in the document of the Korean Patent Application are incorporated as a part of this specification. Technical Field

[0004] The present invention relates to a battery cell for effectively preventing heat propagation and a battery module including the battery cell. Background Art

[0005] Secondary batteries that can be charged and discharged are suitable for use as built-in battery cells because they do not require replacement of battery cells, and as stability and capacity of secondary batteries are rapidly improved, secondary batteries are applied to various devices.

[0006] For example, secondary batteries are widely used not only as energy sources for wireless mobile devices that are small multifunctional products or wearable devices worn on the human body, but also as energy sources or power storage systems (ESS) for electric vehicles and hybrid vehicles that are proposed as alternatives to existing gasoline vehicles and diesel vehicles that cause air pollution.

[0007] In particular, in order to use secondary batteries as a large-capacity and high-output energy source, a battery module including a plurality of battery cells or a battery pack including a plurality of battery modules is being used. As described above, since secondary batteries are used as a large-capacity and high-output energy source, the issue of ensuring the safety of secondary batteries has become an important subject of concern.

[0008] According to the related art, in order to prevent the secondary battery from rapidly shortening its life due to temperature during long-term use, a cooling system has been designed based on a heat release rate and a reliable operating temperature according to the use environment of the secondary battery. However, when a battery cell provided in a battery module or a battery pack exceeds a critical temperature due to abnormal heat generation, thermal runaway (TR) may occur, and heat propagation (TP) to surrounding battery cells may occur. This may cause safety issues such as fire.

[0009] In order to prevent such heat propagation in the related art, a heat insulating plate is provided between the battery cells. However, since the gas and flame generated from the battery cells flow around the heat insulating plate, there is a limit to sufficiently delaying or preventing thermal runaway. Summary of the invention

[0010] Technical issues

[0011] An object of the present invention to solve the above-mentioned problems is to provide a battery cell capable of effectively delaying or preventing heat propagation and a battery module including the battery cell.

[0012] Technical Solution

[0013] A battery cell according to an embodiment of the present invention may include: an electrode assembly; a battery case configured to accommodate the electrode assembly; an electrode lead connected to the electrode assembly to protrude to the outside of the battery case; and an insulating case configured to accommodate the battery case and define a slit in the insulating case for the electrode lead to pass through.

[0014] The slit may extend parallel to a width direction of the battery case.

[0015] One surface of the thermally insulating casing may be open.

[0016] The slit may be connected to an open one surface of the insulating casing.

[0017] The insulating housing may include at least one material selected from mica, aerogel or silicon.

[0018] The thickness of the thermal insulation case may be greater than or equal to the thickness of the battery case.

[0019] In the thermally insulating case, the exhaust hole may be defined in a surface different from a surface defining the slit.

[0020] The thermal insulation case may include: an elastic layer having an elastic material; and a thermal insulation layer stacked on the elastic layer and having a thermal insulation property higher than that of the elastic layer.

[0021] The elastic layer may include a polyurethane material.

[0022] One surface of the thermal insulation case may have a thickness smaller than a thickness of another surface of the thermal insulation case.

[0023] The battery module according to an embodiment of the present invention may include: a housing; a plurality of battery cells accommodated in the housing; and a radiator configured to dissipate heat for the plurality of battery cells. At least a portion of the plurality of battery cells may include: an electrode assembly; a battery housing configured to accommodate the electrode assembly; an electrode lead connected to the electrode assembly to protrude to the outside of the battery housing; and an insulating housing configured to accommodate the battery housing and defining a slit through which the electrode lead passes.

[0024] One surface of the thermal insulation case may be open, and the battery case may be in contact with the heat sink through the open one surface of the thermal insulation case.

[0025] One surface of the thermal insulation case may be in contact with the heat sink, and the one surface of the thermal insulation case may have a thickness smaller than a thickness of another surface of the thermal insulation case.

[0026] In the thermally insulating housing, the exhaust holes may be defined at opposite sides of the heat sink.

[0027] A battery cell according to an embodiment of the present invention may include: an electrode assembly; a battery case configured to accommodate the electrode assembly; and an insulating layer applied on an outer surface of the battery case, and at least a portion of the insulating layer has a thickness greater than or equal to that of the battery case.

[0028] The outer surface of the battery case may include: a first region coated with the heat insulating layer; and a second region to which the heat insulating layer is not applied or is applied to a thickness smaller than that of the first region.

[0029] A battery module according to an embodiment of the present invention may include: a housing; a plurality of battery cells accommodated in the housing; and a heat sink configured to dissipate heat from the plurality of battery cells. At least a portion of the plurality of battery cells may include: an electrode assembly; a battery housing configured to accommodate the electrode assembly; and a heat insulating layer applied to an outer surface of the pouch-type battery housing, and at least a portion of the heat insulating layer having a thickness greater than or equal to that of the battery housing.

[0030] The outer surface of the battery case may include: a first region coated with the heat insulating layer; and a second region not coated with the heat insulating layer and in contact with the heat sink.

[0031] The outer surface of the battery case may include: a first region coated with the heat insulating layer; and a second region coated with the heat insulating layer with a thickness less than that of the first region, wherein the heat insulating layer applied to the second region may contact the heat sink.

[0032] Beneficial Effects

[0033] According to the preferred embodiments of the present invention, even if thermal runaway and fire occur in one battery cell, the thermal runaway or fire can be delayed or prevented from spreading to other surrounding battery cells by the thermal insulation case or the thermal insulation layer.

[0034] In addition, the heat insulating case or the heat insulating layer may have a thickness equal to or greater than that of the battery case. Therefore, a sufficient heat insulating effect can be ensured.

[0035] Furthermore, in the insulating case or the insulating layer, a portion contacting the heat sink may be opened or formed thinner to prevent heat dissipation performance of the battery cell from being deteriorated by the insulating case or the insulating layer, thereby effectively dissipating heat from the battery cell.

[0036] Furthermore, effects that are obvious to those skilled in the art can be predicted from the configuration according to the embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The following drawings attached to this specification illustrate preferred embodiments of the present invention and detailed descriptions for further understanding of the technical spirit of the present invention as well as the present invention, and therefore, the present invention should not be construed as being limited to the drawings.

[0038] Figure 1 is an exploded perspective view of a battery module according to one embodiment of the present invention.

[0039] Figure 2 is an exploded perspective view of a battery cell according to one embodiment of the present invention.

[0040] Figure 3 is a perspective view of a battery cell according to one embodiment of the present invention.

[0041] Figure 4 is a cross-sectional view of a battery cell according to one embodiment of the present invention.

[0042] Figure 5 It is shown Figure 4 A cross-sectional view of a modified example of a battery cell is shown.

[0043] Figure 6 is a perspective view of a battery cell according to another embodiment of the present invention.

[0044] Figure 7 is a cross-sectional view of a battery cell according to another embodiment of the present invention.

[0045] Figure 8 is a perspective view of a battery cell according to still another embodiment of the present invention.

[0046] Fig. 9 is a cross-sectional view of a battery cell according to still another embodiment of the present invention.

[0047] Fig.10 It is shown Fig. 9 A cross-sectional view of a modified example of a battery cell is shown. DETAILED DESCRIPTION

[0048] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily perform the present invention. However, the present invention can be implemented in several different forms and is not limited or constrained by the following examples.

[0049] In order to explain the present invention clearly, detailed description of parts that are not related to the description of the main points of the present invention or related known technologies that may unnecessarily obscure the present invention is omitted, and in this specification, reference numerals are added to the components in each accompanying drawing. In this case, the same or similar reference numerals are assigned to the same or similar elements throughout the specification.

[0050] Furthermore, the terms or words used in the present specification and claims should not be restrictively interpreted as ordinary meanings or dictionary-based meanings, but should be interpreted as meanings and concepts consistent with the scope of the present invention based on the principle that the inventor can appropriately define the concepts of the terms in order to best describe and interpret his or her invention.

[0051] Figure 1 is an exploded perspective view of a battery module according to one embodiment of the present invention.

[0052] A battery module 1 according to one embodiment of the present invention may include a case 10 , a plurality of battery cells 100 accommodated in the case 10 , and a heat sink 30 that dissipates heat from the plurality of battery cells 100 .

[0053] The housing 10 may define the appearance of the battery module 1. The housing 10 may have a substantially box shape. The housing 10 may have an internal space. For example, the housing 10 may include a main body 11 with both ends open and an end plate 12 covering both open ends of the main body 11.

[0054] The main body 11 may be arranged along the length direction of the battery cell 100 (eg, parallel to the Figure 1 The length direction of the battery cell 100 (eg, the direction parallel to the X-axis) extends in the direction of the front-rear direction, which will be described later. Hereinafter, the description will be made by taking the example that the length direction of the battery cell 100 (eg, the direction parallel to the X-axis) is parallel to the front-rear direction.

[0055] The body 11 may have a top surface, a bottom surface, and two side surfaces of the housing 10. The front and rear surfaces of the body 11 may be open. The unit stack 20 in which a plurality of battery cells 100 are stacked may be accommodated in the inner space of the body 11 through the open front or rear surface of the body 11.

[0056] The body 11 may be integrally provided, but is not limited thereto, and furthermore, a plurality of plates may be coupled to each other.

[0057] A pair of end plates 12 may be provided. When the unit stack 20 is accommodated in the body 11, the end plates 12 may respectively cover the open front and rear surfaces of the body 11. Each of the end plates 12 may be coupled to the body 11.

[0058] 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 on one another in a thickness direction (eg, a direction parallel to the Y-axis).

[0059] The cell stack 20 may be provided with a bus bar frame on which electrode leads 115 (see FIG. 1 ) electrically connecting the plurality of battery cells 100 are mounted. Figure 2 ) busbar. For example, the electrode lead 115 of each battery cell 100 may protrude to both sides in the length direction of the battery cell 100. In this case, a busbar frame may be provided at each of both ends of the unit stack 20 in the length direction, and the end plate 12 may cover the busbar frame.

[0060] The plurality of battery cells 100 may be in contact with the heat sink 30. Therefore, the heat sink 30 may effectively dissipate heat from the plurality of battery cells 100.

[0061] The heat sink 30 may be provided on the housing 10, more specifically, on the inner bottom surface of the body 11. However, it is not limited thereto, and the housing 10, more specifically, the bottom surface of the body may be used as the heat sink 30.

[0062] Figure 2 is an exploded perspective view of a battery cell according to one embodiment of the present invention, Figure 3 is a perspective view of a battery cell according to one embodiment of the present invention, and Figure 4 is a cross-sectional view of a battery cell according to one embodiment of the present invention.

[0063] The battery cell 100 according to one embodiment of the present invention may include an electrode assembly 110 (see Figure 4 ), electrode lead 115, battery casing 120 and insulation casing 130.

[0064] The electrode assembly 110 may be provided by alternately stacking positive and negative electrodes and a separator therebetween. That is, the electrode assembly 110 may include a plurality of electrodes and a separator disposed between the plurality of electrodes to insulate the plurality of electrodes from each other. The electrode assembly 110 may be housed in a battery case 120. The electrode assembly 110 includes a stacking type, a winding core type, a stacking and folding type, etc., but is not limited thereto.

[0065] The electrode assembly 110 may include an electrode tab connected to an electrode lead 115, which will be described later. The electrode tab may be formed by cutting uncoated portions of the positive and negative electrodes, or may be formed by connecting a separate conductive member to each uncoated portion.

[0066] The electrode lead 115 may be connected to the electrode assembly 110, more specifically, to the electrode tab. The electrode lead 115 may protrude to the outside of the battery case 120. The electrode lead 115 may be provided as a pair electrically connected to the positive electrode and the negative electrode, respectively. For example, a pair of electrode leads 115 may protrude to both sides in the length direction of the battery cell 100. However, it is not limited thereto, and in addition, the pair of electrode leads 115 may protrude in the same direction relative to the length direction of the battery cell 100.

[0067] The battery case 120 may accommodate the electrode assembly 110 .

[0068] Hereinafter, description will be made by taking as an example that the battery case 120 is a pouch type battery case formed by molding a laminate sheet, However, the present embodiment is not limited thereto.

[0069] In the battery case 120, a cup portion 121 having a pocket shape may be formed in at least one of a pair of cases connected by a bridge 123. In addition, when the bridge 123 is folded while the electrode assembly 110 is accommodated in the cup portion 121, the pair of cases may be joined to each other to form a sealing portion 122.

[0070] The sealing portion 122 may be disposed along the periphery of the cup-shaped portion 121. Portions of the sealing portion 122 disposed at opposite sides of the bridge 123 may be folded laterally at least once, and may preferably be double-sided folded (DSF). In addition, the electrode lead 115 may protrude to the outside through the non-folded sealing portion 122. The configuration of the pouch-type battery case is a well-known technique, and thus a detailed description will be omitted.

[0071] The insulation case 130 may accommodate the battery case 120. The insulation case 130 may have a substantially box shape, but is not limited thereto.

[0072] The insulation case 130 may include a material having insulation properties greater than those of the battery case 120. For example, the insulation case 130 may include at least one material selected from mica, aerogel, or silicon.

[0073] As a result, even if thermal runaway or fire occurs in one battery cell 100 , occurrence of heat propagation or diffusion of the fire to other surrounding battery cells 100 may be delayed or prevented by the heat insulating case 130 .

[0074] The thickness t2 of the insulation case 130 may be greater than or equal to the thickness t1 of the battery case 120. As a result, the insulation effect of the insulation case 130 may be sufficiently ensured.

[0075] One surface (eg, bottom surface) of the insulation case 130 may be opened. In more detail, at least a portion of one surface of the insulation case 130 may be opened to form an opening 133 .

[0076] The opened one surface of the insulation case 130 may be a surface facing the heat sink 30 , and may be covered by the heat sink 30 .

[0077] The battery case 120 may contact the heat sink 30 through one open surface of the heat insulating case 130. Preferably, the bridge 123 of the battery case 120 and the periphery of the bridge 123 may contact the heat sink 30 through one open surface of the heat insulating case 130. As a result, the heat dissipation performance of the battery cell 100 may be prevented from being deteriorated due to the heat insulating case 130, and the heat dissipation of the battery cell 100 may be effectively performed.

[0078] A slit 131 through which the electrode lead 115 passes may be defined in the heat insulating case 130. Therefore, the electrode lead 115 of the battery cell 100 may be easily connected to the outside through the slit 131.

[0079] The slit 131 may be connected to one open surface of the insulating case 130. In more detail, the slit 131 may extend in parallel with the width direction of the battery case 120 (e.g., in parallel with the Z-axis direction), and one end of the slit 131 may be open. Therefore, when the battery case 120 is accommodated in the insulating case 130 through the open one surface of the insulating case 130, the electrode lead 115 may be easily inserted into the slit 131.

[0080] In the insulating housing 130, the exhaust hole 132 may be defined in a surface (e.g., a top surface) different from the surface (e.g., a front surface and a rear surface) on which the slit 131 is defined. Therefore, the influence of the gas exhausted through the exhaust hole 132 on the electrode lead 115 inserted into the slit 131 may be minimized.

[0081] Therefore, the vent hole 132 may be defined in a surface (eg, top surface) of the insulating case 130 different from a surface (eg, both surfaces) facing another battery cell 100. Therefore, the influence of the gas exhausted through the vent hole 132 on another battery cell 100 may be minimized.

[0082] The exhaust hole 132 may be defined in an opposite surface (eg, top surface) of an open surface (eg, bottom surface) of the insulation case 130. That is, the exhaust hole 132 may be defined at opposite sides of the heat sink 30.

[0083] The area of ​​the exhaust hole 132 may be larger than the area of ​​the slit 131. Therefore, if the internal pressure of the insulating case 130 increases rapidly due to gas generated by thermal runaway or fire within the insulating case 130, the gas may be preferentially and rapidly discharged through the exhaust hole 132. The exhaust hole 132 is usually closed with a cover, and when the internal pressure of the insulating case 130 increases above a set value, the cover may be broken to open the exhaust hole 132.

[0084] Although not shown in the drawings, some of the plurality of battery cells provided in the battery module 1 may not include the insulating case 130. For example, the battery cells 100 including the insulating case 130 and the battery cells not including the insulating case 130 among the plurality of battery cells may be alternately arranged.

[0085] Figure 5 It is shown Figure 4 A cross-sectional view of a modified example of a battery cell is shown.

[0086] According to a modified example, the insulating case 130 of the battery cell 100 may have a multilayer structure made of different materials. In more detail, the insulating case 130 may have an elastic layer 130a made of an elastic material and an insulating layer 130b stacked on the elastic layer 130a and having an insulating property greater than that of the elastic layer 130a.

[0087] The elastic layer 130a may be stacked inside the heat insulating layer 130b, but is not limited thereto. For example, the elastic layer 130a may be stacked between a pair of heat insulating layers 130b.

[0088] The elastic layer 130a may include a material having a high elastic modulus. For example, the elastic layer 130a may include a polyurethane material. The elastic layer 130a may protect the battery case 120 and the electrode assembly 110 accommodated in the battery case 120 by buffering the impact applied from the outside of the battery cell 100. In addition, the deformation of the insulating case 130 caused by the expansion of the battery case 120 may be minimized.

[0089] The heat insulating layer 130b may be stacked 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 applied on the surface of the elastic layer 130a.

[0090] The heat insulating layer 130b may include a material having a heat insulating property greater than that of the battery case 120. For example, the heat insulating layer 130b may include at least one material selected from mica, aerogel, or silicon.

[0091] To fully ensure the insulation effect of the insulation layer 130b, the thickness of the insulation layer 130b may be greater than or equal to the thickness of the battery case 120. When there are multiple insulation layers 130b, the sum of the thicknesses of the multiple insulation layers 130b may be greater than or equal to the thickness of the battery case 120.

[0092] Figure 6 is a perspective view of a battery cell according to another embodiment of the present invention, and Figure 7 is a cross-sectional view of a battery cell according to another embodiment of the present invention.

[0093] Hereinafter, contents overlapping with those of the aforementioned embodiment will be omitted, and differences will be mainly described.

[0094] The insulation case 130 of the battery cell 100 ′ according to another embodiment of the present invention may include one surface 134 in contact with the heat sink 30 . The one surface 134 may define a bottom surface of the insulation case 130 .

[0095] The one side 134 may be prepared separately from the other surface of the insulation case 130 so as to be disposed to cover the above-mentioned opening 133. However, it is not limited thereto, and the one side 134 may be integrated with the other surface of the insulation case 130.

[0096] As a result, since the battery case 130 is completely surrounded by the heat insulating case 130 , when thermal runaway or fire occurs in one battery cell 100 ′, occurrence of heat propagation or diffusion of fire to other battery cells 100 ′ can be more reliably delayed or prevented.

[0097] The battery case 120 may release heat to the heat sink 30 through one surface 134 of the insulation case 130. Preferably, the bridge 123 of the battery case 120 and the periphery of the bridge 123 may contact one surface 134 of the insulation case 130, and one surface 134 may contact the heat sink 30.

[0098] In order to minimize the deterioration of heat dissipation performance due to the one side 134 of the insulation case 130 , the thickness t3 of the one side 134 may be smaller than the thickness t2 of the other surface of the insulation case 130 .

[0099] Figure 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.

[0100] Hereinafter, contents overlapping with the aforementioned embodiment will be omitted, and differences will be mainly described.

[0101] A battery cell 100″ according to another embodiment of the present invention may include an insulating layer 140 applied on the outer surface of the battery case 120 instead of the insulating case 130. Therefore, when compared with the aforementioned embodiment, since it is not necessary to prepare the insulating case 130, it has an advantage of simplifying the manufacturing process.

[0102] In order to sufficiently ensure the heat insulating effect of the heat insulating layer 140 , the thickness t4 of at least a portion of the heat insulating layer 140 may be greater than or equal to the thickness t1 of the battery case 120 .

[0103] As a result, even if thermal runaway and fire occur in one battery cell 100 ″, the thermal insulation layer 140 can delay or prevent the occurrence of heat propagation or diffusion of the fire to other surrounding battery cells 100 ″.

[0104] 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 not coated with the heat insulating layer 140. The second region 120b may be in contact with the heat sink 30.

[0105] For example, the second region 120b may be the bottom surface of the battery case 120. In more detail, the second region 120b may be the outer surface of the bridge 123 and the periphery of the bridge 123. In addition, the first region 120a may be the remaining outer surface except the second region 120b.

[0106] As a result, the heat dissipation performance of the battery cell 100 ″ may be prevented from being deteriorated due to the heat insulating layer 140 , and the heat of the battery cell 100 ″ may be effectively dissipated.

[0107] Although not shown in the drawings, some of the plurality of battery cells provided in the battery module 1 may not include the insulation layer 140. For example, battery cells 100" including the insulation layer 140 and battery cells not including the insulation layer 140 may be alternately arranged among the plurality of battery cells.

[0108] Fig.10 It is shown Fig. 9 A cross-sectional view of a modified example of a battery cell is shown.

[0109] According to a modified example, the heat insulating layer 140 of the battery cell 100 ″ may be applied on substantially the entire outer surface of the battery case 120 .

[0110] 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 thinner thickness than the first region 120a. In addition, the heat insulating layer 140 applied to the second region 120b may contact the heat sink 30.

[0111] In more detail, the thickness t5 of the heat insulating layer 140 applied on the second region 120b may be thinner than the thickness t4 of the heat insulating layer 140 applied on the first region 120a. As a result, deterioration of heat dissipation performance caused by the heat insulating layer 140 applied on the second region 120b may be minimized.

[0112] The above-disclosed subject matter is to be considered illustrative rather than restrictive, and the appended claims are intended to cover all such modifications, enhancements, and other embodiments, which fall within the true spirit and scope of the present invention.

[0113] Therefore, the embodiments of the present invention should be regarded as illustrative rather than restrictive, and the technical spirit of the present invention is not limited to the aforementioned embodiments.

[0114] Therefore, the scope of the invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.

[0115] [Description of symbol]

[0116] 1: Battery module 10: Housing

[0117] 20: unit stack 30: heat sink

[0118] 100: Battery cell 110: Electrode assembly

[0119] 115: Electrode lead 120: Battery case

[0120] 130: Insulation shell 131: Slit

[0121] 132: Exhaust hole 133: Opening

[0122] 140: Insulation layer

Claims

1. A battery cell, comprising: Electrode assembly; a battery housing configured to accommodate the electrode assembly; an electrode lead connected to the electrode assembly to protrude outside the battery case; as well as A thermal insulation case is configured to accommodate the battery case and defines a slit therein through which the electrode lead passes.

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

3. The battery cell according to claim 1, wherein: One surface of the thermally insulating casing is open.

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

5. The battery cell according to claim 1, wherein: The insulating shell includes at least one material selected from mica, aerogel or silicon.

6. The battery cell according to claim 1, wherein: The thickness of the thermal insulation shell is greater than or equal to the thickness of the battery shell.

7. The battery cell according to claim 1, wherein: In the heat-insulating case, a gas exhaust hole is defined in a surface different from a surface defining the slit.

8. The battery cell according to claim 1, wherein: The thermal insulation housing comprises: an elastic layer having an elastic material; and A heat insulating layer is stacked on the elastic layer and has a higher heat insulating property than the elastic layer.

9. The battery cell according to claim 8, wherein: The elastic layer includes a polyurethane material.

10. The battery cell according to claim 1, wherein: A thickness of one surface of the thermal insulation case is smaller than a thickness of another surface of the thermal insulation case.

11. A battery module, comprising: case; a plurality of battery cells housed in the housing; as well as a radiator, wherein the radiator dissipates heat from the plurality of battery cells, Wherein, at least a portion of the plurality of battery cells comprises: Electrode assembly; a battery housing configured to accommodate the electrode assembly; an electrode lead connected to the electrode assembly to protrude to the outside of the battery case; and A thermal insulation case is configured to accommodate the battery case and defines a slit therein through which the electrode lead passes.

12. The battery module according to claim 11, wherein: One surface of the thermally insulating housing is open, and The battery case is in contact with the heat sink through one open surface of the heat insulating case.

13. The battery module according to claim 11, wherein: One surface of the heat insulating housing is in contact with the heat sink, and The thickness of the one surface of the thermal insulation case is smaller than the thickness of the other surface of the thermal insulation case.

14. The battery module according to claim 11, wherein: In the heat-insulating housing, exhaust holes are defined at opposite sides of the heat sink.

15. A battery cell, comprising: Electrode assembly; a battery housing configured to accommodate the electrode assembly; as well as A heat insulating layer is applied on the outer surface of the battery case, and the thickness of at least a portion of the heat insulating layer is greater than or equal to the thickness of the battery case.

16. The battery cell according to claim 15, wherein: The outer surface of the battery housing includes: a first region, the first region being coated with the thermal insulation layer; and A second region, the thermal insulation layer is not applied to the second region or is applied to a thickness less than the thickness of the first region.

17. A battery module, comprising: case; a plurality of battery cells housed in the housing; as well as a radiator, wherein the radiator dissipates heat from the plurality of battery cells, Wherein, at least a portion of the plurality of battery cells comprises: Electrode assembly; a battery housing configured to accommodate the electrode assembly; A heat insulating layer is applied on an outer surface of the battery case of the pouch type, and a thickness of at least a portion of the heat insulating layer is greater than or equal to a thickness of the battery case.

18. The battery module according to claim 17, wherein: The outer surface of the battery housing includes: a first region, the first region being coated with the thermal insulation layer; and A second region is not coated with the heat insulating layer and is in contact with the heat sink.

19. The battery module according to claim 17, wherein: The outer surface of the battery housing includes: a first region, the first region being coated with the thermal insulation layer; and a second region, the second region being coated with the heat insulating layer at a thickness less than the thickness of the first region, Wherein, the thermal insulation layer applied to the second region is in contact with the heat sink.

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