Battery cell, battery assembly, and moving means

Abstract

According to the present disclosure, a battery cell capable of effectively delaying the propagation of heat to an adjacent battery cell even when thermal runaway occurs, a battery assembly capable of improving thermal stability, and a moving means capable of reducing the risk of burning due to fire, may comprise: an electrode assembly; a cell case including a main body portion accommodating the electrode assembly and a terrace portion disposed outside the main body portion; an electrode lead drawn out of the cell case through the terrace portion; and a foamable refractory member disposed on the terrace portion side.

Description

Battery cells, battery assemblies and vehicles

[0001] This disclosure claims the benefit of the priority date of Patent Application No. 10-2024-0037551, filed with the Korean Intellectual Property Office on March 19, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to a battery cell.

[0003] Additionally, the present disclosure relates to a battery assembly.

[0004] Additionally, the present disclosure relates to a means of transportation.

[0005] A means of transportation such as an electric vehicle may include a battery assembly as its power source.

[0006] A battery assembly may include a battery module or a battery pack. The battery module or battery pack may include a plurality of battery cells. Thermal runaway (TR) may refer to a situation in which the internal temperature of a battery increases sequentially, leading to an explosion. Thermal runaway may occur when a mechanical, electrical, and / or thermal abnormality (abuse) occurs in the battery.

[0007] In a battery assembly, if a thermal runaway phenomenon occurs in a single battery cell, the resulting flame and exhaust may be emitted from that cell, spreading heat to adjacent battery cells. Flames emitted from a single battery cell can easily spread to adjacent battery cells, particularly through electrode leads. The electrode leads may be components that electrically connect the battery cells to the outside world.

[0008] Fire-resistant coatings are materials that expand when exposed to flame, forming a fire-resistant insulating layer. When exposed to flame, the fire-resistant coating transforms into char, protecting the substrate from flame and heat.

[0009] The present disclosure seeks to provide a battery cell capable of effectively delaying heat propagation to adjacent battery cells even when thermal runaway occurs.

[0010] The present disclosure seeks to provide a battery assembly capable of improving thermal stability.

[0011] The present disclosure seeks to provide a means of transportation that can reduce the risk of total destruction by fire.

[0012] One specific embodiment of the present disclosure is a battery cell comprising: an electrode assembly; a cell case including a main body portion accommodating the electrode assembly and a terrace portion disposed on the outside of the main body portion; an electrode lead extending out of the cell case through the terrace portion; and a foamed refractory member disposed on the side of the terrace portion.

[0013] The above body part forms a receiving space for receiving the electrode assembly, the thickness of the terrace part may be smaller than the thickness of the body part, and the width of the electrode lead side of the terrace part may be smaller than the width of the body part side of the terrace part.

[0014] The above-mentioned foamed refractory member is arranged on the surface of the terrace portion, and the width of the electrode lead side of the above-mentioned foamed refractory member may be smaller than the width of the body side of the above-mentioned foamed refractory member.

[0015] The above-mentioned foamable refractory member can expand at a temperature above a predetermined temperature.

[0016] The shape of the above foamed refractory member can correspond to the shape of the above terrace portion.

[0017] The above foamed refractory member may be a paint covering at least a portion of the surface of the terrace portion.

[0018] The battery cell may further include a porous member disposed between the terrace portion and the foamed refractory member.

[0019] The width of the electrode lead side of the porous member may be smaller than the width of the main body side of the porous member.

[0020] The shape of the above porous member can correspond to the shape of the above terrace portion.

[0021] The above porous member can cover the surface of the terrace portion.

[0022] The thickness of the above porous member may be smaller than the thickness of the above main body.

[0023] The above porous member may have a plurality of through holes.

[0024] Each cross-section of the plurality of through holes is a polygon with a preset area, and the plurality of through holes can be spaced apart at preset intervals.

[0025] At least some of the plurality of through holes may be filled with the foamed refractory material.

[0026] The above foamed refractory member can pass through at least some of the plurality of through holes.

[0027] The thickness of the above-mentioned foamed refractory member may be smaller than the thickness of the above-mentioned porous member.

[0028] The battery cell may further include an adhesive member disposed between the terrace portion and the porous member.

[0029] The above adhesive member can attach the terrace portion and the foamed refractory member.

[0030] Another specific example of the present disclosure is a battery assembly comprising: an assembly case including a receiving space; a cell assembly disposed in the receiving space; and a bus bar assembly disposed between the assembly case and the cell assembly; wherein the cell assembly includes a plurality of battery cells, and at least one battery cell of the cell assembly includes: an electrode assembly; a cell case including a main body portion that accommodates the electrode assembly and a terrace portion disposed outside the main body portion; an electrode lead extended to the outside of the cell case through the terrace portion; and a foamed refractory member disposed on the terrace portion side.

[0031] The above-mentioned foamable refractory member can be placed only in a battery cell including the foamable refractory member.

[0032] The above-mentioned foamable refractory member can expand when the temperature of the main body of the battery cell including the foamable refractory member is higher than a preset temperature.

[0033] Another specific example of the present disclosure is a moving means comprising: a body part; and a power supply part; wherein the power supply part includes a battery assembly, the battery assembly including an assembly case including a receiving space; a cell assembly disposed in the receiving space; and a bus bar assembly disposed between the assembly case and the cell assembly; wherein the cell assembly includes a plurality of battery cells, and at least one battery cell of the cell assembly includes an electrode assembly; a cell case including a body part that accommodates the electrode assembly and a terrace part disposed outside the body part; an electrode lead extended to the outside of the cell case through the terrace part; and a foamed fireproof member disposed on the terrace part side.

[0034] The battery cell of the present disclosure can effectively delay the spread of heat to adjacent battery cells even when thermal runaway occurs.

[0035] The battery assembly of the present disclosure can improve thermal stability.

[0036] The means of transportation of the present disclosure can reduce the risk of total destruction by fire.

[0037] Figure 1 is a front view of a battery cell of one specific example.

[0038] Figure 2 is a bottom cross-sectional view of a battery cell of one specific example.

[0039] Figure 3 is an exploded perspective view of a portion of a battery cell of one specific example.

[0040] Figure 4 is an enlarged view of the bottom surface of a battery cell of one specific example.

[0041] Figure 5 is a front view of a porous member of one specific example.

[0042] Figure 6 is an exploded perspective view of a battery assembly of one specific example.

[0043] Figure 7 is a plan cross-sectional view of a battery assembly of one specific example.

[0044] Figure 8 is a plan cross-sectional view of a battery assembly of one specific example.

[0045] Figure 9 is a perspective view of a specific example of a moving means.

[0046] Hereinafter, the present disclosure will be described in detail with reference to the attached drawings. However, this description is for illustrative purposes only. The scope of the present disclosure is not limited to the specific embodiments described as examples.

[0047] One specific example of the present disclosure is a battery cell (110). The battery cell (110) may include an electrode assembly (111), a cell case (113), electrode leads (115, 117), and a foamable refractory member (119).

[0048] Figure 1 is a front view of a battery cell (110) of one specific example.

[0049] Referring to FIG. 1, a battery cell (110) may include a cell case (113) that accommodates an electrode assembly (111), electrode leads (115, 117) extending outward from the cell case (113), and a foamed refractory member (119) disposed in the cell case (113).

[0050] Referring to FIG. 1, the battery cell (110) may include an electrode assembly (111) and a cell case (113) that accommodates the electrode assembly (111). The battery cell (110) may refer to a basic unit of a secondary battery capable of charging and discharging electric energy.

[0051] Referring to FIG. 1, the cell case (113) may include a main body portion (1131) and a terrace portion (1133). The main body portion (1131) may accommodate the electrode assembly (111). The remaining portion of the cell case (113) excluding the main body portion (1131), i.e., the portion disposed on the outside of the main body portion (1131), may be a terrace portion (1133).

[0052] Referring to FIG. 1, the electrode leads (115, 117) can be extended to the outside from the cell case (113). The electrode leads (115, 117) can be extended to the outside through a terrace portion (1133) of the cell case (113). The terrace portion (1133) can be positioned between the main body portion (1131) and the electrode leads (115, 117). Since the electrode leads (115, 117) are extended to the outside of the cell case (113), flames and heat generated by thermal runaway of the battery cell (110) can easily spread to an adjacent location through the electrode leads (115, 117).

[0053] Referring to Fig. 1, the foamable refractory member (119) may be placed on the terrace portion (1133). The foamable refractory member (119) may be placed in a region between the electrode leads (115, 117) and the body portion (1131) excluding the body portion (1131) of the cell case (113). Accordingly, the propagation of heat due to flames and discharges formed by thermal runaway of the battery cell (110) may be effectively delayed.

[0054] The electrode assembly (111) may include at least a unit cell including an anode, a cathode, and a separator disposed between the anode and the cathode. The electrode assembly (111) may include a plurality of the unit cells. The electrode assembly (111) may convert electrical energy into chemical energy or chemical energy into electrical energy using an oxidation-reduction reaction.

[0055] The shape of the cell case (113) can determine the type of the battery cell (110). The type of the battery cell (110) can be classified into a square shape, a cylindrical shape, a pouch shape, a coin shape, etc., depending on the shape of the cell case (113).

[0056] The electrode leads (115, 117) may be electrically connected to the electrode assembly (111). The electrode leads (115, 117) may be electrically connected to the outside of the battery cell (110). The electrode leads (115, 117) may connect the electrode assembly (111) to the outside. If the electrode leads (115, 117) are negative leads, the electrode leads (115, 117) may include nickel. If the electrode leads (115, 117) are positive leads, the electrode leads (115, 117) may include aluminum.

[0057] The above-mentioned foamed refractory member (119) may include a refractory paint. The above-mentioned foamed refractory member (119) may be formed by applying a refractory paint.

[0058] The battery cell (110) may further include an electrolyte. The electrolyte may be injected or placed in the cell case (113) of the battery cell (110) and stored together with the electrode assembly (111).

[0059] Fig. 2 is a bottom cross-sectional view of a battery cell (110) of one specific example. When the center of the battery cell (110) of Fig. 1 is cut in the Y-axis direction, the cross-sectional view of Fig. 2 can be obtained.

[0060] Referring to FIGS. 1 and 2, the cell case (113) may have, for example, a pouch shape. The battery cell (110) may be a pouch-type battery cell (110).

[0061] The pouch-type battery cell (110) can be manufactured by housing and sealing the electrode assembly (111) in the cell case (113). Referring to FIG. 2, the main body (1131) can form a receiving space for accommodating the electrode assembly (111). The volume of the main body (1131) can correspond to the volume of the electrode assembly (111).

[0062] Referring to FIG. 2, the electrode of the electrode assembly (111) can be connected to the electrode leads (115, 117) through electrode tabs (1115, 1117). The electrode tabs (1115, 1117) may be extensions of the electrodes of the electrode assembly (111). The electrode tabs (1115, 1117) may be extensions of the current collectors of the electrodes of the electrode assembly (111). The electrode tabs (1115, 1117) and the electrode leads (115, 117) may be joined by a method such as welding.

[0063] Referring to FIG. 2, the terrace portion (1133) can be formed by sealing a portion of the cell case (113) excluding the main body portion (1131). An insulating film (1119) can be placed between the inside of the cell case (113) corresponding to the terrace portion (1133) and the electrode leads (115, 117). The insulating film (1119) can close the space between the cell case (113) and the electrode leads (115, 117).

[0064] Referring to FIG. 2, the thickness of the terrace portion (1133) may be smaller than the thickness of the main body portion (1131). This may be because the main body portion (1131) can accommodate the electrode assembly (111), and the edge portion is sealed while the electrode leads (115, 117) and (if necessary) the insulating film (1119) are arranged. In the battery assembly (10) formed by assembling a plurality of battery cells (110), the terrace portion (1133) of the battery cell (110) can form an empty space. Therefore, when the foamable refractory member (119) is arranged on the terrace portion (1133) side, the spatial efficiency of the battery assembly (10) can be improved.

[0065] The width of the electrode leads (115, 117) may be smaller than the width of the electrode assembly (111). The shape of the edge portion may be modified to correspond to the shape of the electrode leads (115, 117) that are extended outward while sealing the electrode leads (115, 117). Accordingly, the width of the electrode leads (115, 117, electrode leads that are extended outward) of the terrace portion (i.e., the length in the Z-axis direction of FIG. 1) may be smaller than the width of the terrace portion (1133) on the main body portion (1131) side. For example, the terrace portion (1133) may have a shape in which the width narrows in the direction from the main body portion (1131) toward the electrode leads (115, 117). A battery cell (110) having such a terrace portion (1133) shape can be more easily coupled to a bus bar.

[0066] Referring to FIG. 2, the foamable refractory member (119) may be disposed on the surface of the terrace portion (1133). The foamable refractory member (119) may be disposed on one or both sides of the cell case (113) at a position corresponding to the terrace portion (1133). In addition, the foamable refractory member (119) may be disposed on the front and rear sides of the terrace portion (1133) with the porous member (118) described below interposed therebetween.

[0067] The above-mentioned foamed refractory member (119) may be formed by applying a refractory paint on the terrace portion (1133). The above-mentioned foamed refractory member (119) may be arranged on the surface of the terrace portion (1133). The width of the above-mentioned foamed refractory member (119) on the electrode lead (115, 117) side may be smaller than the width of the above-mentioned foamed refractory member (119) on the main body (1131) side.

[0068] The type of the above-mentioned fire-resistant paint is not particularly limited as long as it can form a char that can block the inflow of external flame and oxygen and the spread of heat by foaming and / or expanding when exposed to flame. The above-mentioned foam-resistant member (119) can expand at a temperature higher than a predetermined temperature. Specifically, the above-mentioned foam-resistant member (119) can expand when the temperature of the battery cell (110) is higher than the predetermined temperature.

[0069] The shape of the above foamed refractory member (119) may correspond to the shape of the terrace portion (1133).

[0070] For some shapes to correspond to each other may mean that they have the same or similar shapes and can be superimposed on each other.

[0071] The above-mentioned foamable refractory member (119) can be formed by applying a foamable refractory paint. That is, the above-mentioned foamable refractory member (119) can be a paint that covers at least a portion of the surface of the terrace portion (1133).

[0072] The battery cell (110) may further include a porous member (118). The porous member (118) may be disposed between the terrace portion (1133) and the foamed refractory member (119). The porous member (118) may be disposed between the surface of the terrace portion (1133) and the foamed refractory member (119). Since the foamed refractory member (119) may be formed by applying a foamed refractory paint, the porous member (118) may allow the foamed refractory paint to be applied more smoothly to the cell case (113) through its pores. As a result, the porous member (118) may allow the foamed refractory member (119) to be better attached to the terrace portion (1133).

[0073] Figure 3 is an exploded perspective view of a portion of a battery cell (110) of one specific example.

[0074] Referring to FIG. 3, the foamed refractory member (119) and the porous member (118) may be arranged on the terrace portion (1133). The porous member (118) may be arranged between the foamed refractory member (119) and the terrace portion (1133).

[0075] The porous member (118) may include a material having sufficient stiffness. As a result, the porous member (118) can support the foamed refractory member (119), and the foamed refractory member (119) can maintain a shape corresponding to the porous member (118).

[0076] Referring to FIG. 3, the width of the electrode lead (115, 117) side of the porous member (118) may be smaller than the width of the main body (1131) side of the porous member (118). Accordingly, spatial constraints resulting from the introduction of additional members into the battery cell (110) may be reduced.

[0077] Referring to FIG. 3, the shape of the porous member (118) may correspond to the shape of the terrace portion (1133). The porous member (118) may cover the surface of the terrace portion (1133). The porous member (118) may cover at least a portion of the surface of the terrace portion (1133). Meanwhile, since the foamed refractory member (119) may be formed by applying a refractory paint, the foamed refractory member (119) may have a shape that penetrates the pores of the porous member (118).

[0078] The thickness of the porous member (118) may be smaller than the thickness of the main body portion (1131). This may mean that the porous member (118) may be placed within the empty space formed by the terrace portion (1133) without changing the volume of the empty space.

[0079] Referring to FIG. 3, the porous member (118) may have a plurality of through holes. That is, the porous member (118) may have a plurality of holes that penetrate in the direction (X-axis direction of FIG. 3) toward the terrace portion (1133) from the foamed refractory member (119).

[0080] Figure 4 is an enlarged view of the bottom surface of a battery cell (110) of one specific example.

[0081] Referring to FIG. 4, the foamed refractory member (119) can fill at least a portion of the plurality of through holes. The foamed refractory member (119) can pass through at least a portion of the plurality of through holes. This is because the foamed refractory member (119) is formed by applying a foamed refractory paint onto the terrace portion (1133) on which the porous member (118) is arranged.

[0082] Referring to FIG. 4, most of the foamable refractory paint can be impregnated into the through holes of the porous member (118). A portion of the foamable refractory paint can form a thin film on the surface of the porous member (118). That is, the thickness of the foamable refractory paint (119) can be smaller than the thickness of the porous member (118). Here, the thickness of the foamable refractory paint (119) can mean the thickness of the portion of the foamable refractory paint (119) exposed on the surface of the porous member (118). In addition, this can also mean that the amount of the refractory paint used can be reduced when the porous member (118) has a mesh structure including a plurality of through holes.

[0083] Fig. 5 is a front view of a porous member (118) of one specific example. Specifically, Fig. 5 is a front view of the porous member (118) and a partially enlarged view thereof.

[0084] Referring to Fig. 5, the porous member (118) may have a mesh structure including a plurality of through holes. In the mesh structure, the shape or arrangement of the through holes is not particularly limited. Meanwhile, if the through holes have a certain shape and are regularly arranged, the foamed refractory member (119) may have a more stable bonding force and shape and be fixed to the terrace portion (1133).

[0085] Referring to Fig. 5, in the mesh structure, the plurality of through holes may have a cross-section of a polygon (octagon in Fig. 5) having a predetermined area. For example, the cross-sectional shape of the through holes may be a circle or a polygon having a predetermined area. Specifically, the cross-sectional shape of the through holes may be a square, a regular hexagon, or a regular octagon having a predetermined area. This may mean that the cross-sectional shape of the through holes is constant.

[0086] Referring to FIG. 5, the plurality of through holes in the mesh structure may be spaced apart at predetermined intervals. The plurality of through holes may be spaced apart at predetermined intervals in the porous member (118). This may mean that the through holes are regularly arranged in the porous member (118).

[0087] The porous member (118) may be coupled or attached to the terrace portion (1133) via an adhesive member (not shown). That is, the battery cell (110) may further include an adhesive member (not shown) disposed between the terrace portion (1133) and the porous member (118). The adhesive member may include a double-sided adhesive tape, etc. In addition, the foamed refractory member (119) may pass through some of the through holes of the porous member (118). At this time, the adhesive member may attach the terrace portion (1133) and the foamed refractory member (119).

[0088] In this way, a battery cell (110) including a foamed refractory member (119) disposed at a specific location of the cell case (113), specifically, a terrace portion (1133) of the cell case (113), can delay the spread of heat and flame to adjacent battery cells (110) even if a thermal runaway phenomenon occurs. In addition, this advantage can be improved by further disposing a porous member (118) between the terrace portion (1133) and the foamed refractory member (119).

[0089] The present disclosure relates, in another specific example, to a battery assembly (10).

[0090] The battery assembly (10) may include a battery module and a battery pack. Typically, a battery module may refer to a structure in which a plurality of battery cells (110) are assembled. In addition, a battery pack may refer to a structure in which a plurality of battery modules are assembled. Recently, a technology has been known for obtaining a battery pack directly by omitting the process of manufacturing battery cells (110) into a battery module. The battery assembly (10) of the present disclosure may also include a battery pack in which a battery module is omitted. A battery module and a battery pack may have in common that they include a plurality of battery cells (110) and a case that accommodates them.

[0091] Figure 6 is an exploded perspective view of a battery assembly (10) of one specific example.

[0092] Referring to FIG. 6, the battery assembly (10) may include an assembly case (200) including a receiving space and a cell assembly (100) arranged in the receiving space. The cell assembly (100) may include a plurality of battery cells (110).

[0093] The battery assembly (10) may include a busbar assembly (300) disposed between the assembly case (200) and the cell assembly (100). The busbar assembly (300) may be disposed between the electrode leads (115, 117) of the battery cells (110) and the assembly case (200). The busbar assembly (300) may electrically connect a plurality of battery cells (110) constituting the cell assembly (100). The busbar assembly (300) may include a busbar frame (310) forming its skeleton and a lead insertion portion (320) to which the electrode leads (115, 117) of the battery cells (110) are connected.

[0094] The assembly case (200) may include a case body (210) that accommodates the cell assembly (100). The case body (210) may have a structure in which one side and an opposite side thereof are perforated. An imprint that can indicate a terminal of a battery cell (110) may be formed on an upper surface adjacent to the perforated side of the case body (210). The assembly case (200) may further include a case end plate (220) that closes the perforated side. The busbar assembly (300) may be disposed between the cell assembly (100) and the case end plate (220).

[0095] The above battery assembly (10) may include a plurality of battery cells (110) of the present disclosure. Therefore, the description of the battery assembly (10) regarding the battery cells (110) may be applied as is.

[0096] When thermal runaway occurs in the battery cell (110), the process by which the battery assembly (10) delays heat and flame propagation is described in more detail with reference to FIGS. 7 and 8.

[0097] Fig. 7 is a planar cross-sectional view of a battery assembly (10) of one embodiment before thermal runaway occurs. Fig. 8 is a planar cross-sectional view of a battery assembly (10) of one embodiment after thermal runaway (TR) occurs.

[0098] Referring to FIG. 7, the foamed refractory member (119) may be placed only in a battery cell (110) including the foamed refractory member (119) before thermal runaway occurs. The foamed refractory member (119) placed in one battery cell (110) may not come into contact with another adjacent battery cell (110) before thermal runaway occurs. The foamed refractory member (119) may not directly or indirectly connect a plurality of adjacent battery cells (110).

[0099] As described above, the foamable refractory member (119) may expand when the temperature of the battery cell (110) is higher than a preset temperature. Specifically, the foamable refractory member (119) may expand when the temperature of the battery cell (110) in which the foamable refractory member (119) is placed is higher than a preset temperature.

[0100] Referring to Fig. 8, when thermal runaway (TR) occurs in the battery cell (110), heat may be generated due to flames, discharged substances, and vent gases. This heat may be transferred to the terrace portion (1133), and the foamed refractory member (119) may expand. At this time, the foamed refractory member (119) may expand to form a char. Heat and oxygen, etc. may not be transferred to the area surrounded by the char. At this time, the expanded foamed refractory member (119) may fill the empty space between the terrace portions (1133) of adjacent battery cells (110). As a result, heat and flame caused by thermal runaway may be prevented or delayed from spreading to adjacent cells.

[0101] A battery assembly (10) including a plurality of battery cells (110) in which a foamable refractory member (119) is arranged at a specific location in a cell case (113) of a specific shape in this way can exhibit thermally stable behavior. This is because the spread of heat and flame to other battery cells (110) adjacent to the battery cell (110) can be sufficiently prevented or delayed.

[0102] Another specific example of the present disclosure is a means of transportation (1). The means of transportation (1) may include, for example, a two-wheeled vehicle such as an electric kickboard, an electric vehicle, or a flying device such as a drone.

[0103] The moving means (1) of the present disclosure may include the battery assembly (10). The electric energy generated by the battery assembly (10) may serve as the power source for the moving means (1). The moving means (1) of the present disclosure may include a body; and a power supply unit; and the power supply unit may include the battery assembly (10) of the present disclosure.

[0104] [Explanation of symbols]

[0105] 1: Means of transportation

[0106] 10: Battery assembly

[0107] 100: Cell assembly 110: Battery cell

[0108] 111: Electrode assembly

[0109] 1115, 1117: Electrode tab 1119: Insulating film

[0110] 113: Cell Case

[0111] 1131: Main body 1133: Terrace

[0112] 115, 117: Electrode leads

[0113] 118: Porous member 119: Foamed refractory member

[0114] 200: Assembly case 210: Case body 220: Case end plate

[0115] 300: Busbar assembly 310: Busbar frame 320: Lead insert

Claims

1. Electrode assembly; A cell case including a main body portion that accommodates the electrode assembly and a terrace portion disposed on the outside of the main body portion; An electrode lead extending out of the cell case through the terrace portion; and A foamed fireproof member arranged on the terrace side; A battery cell comprising:

2. In paragraph 1, The above main body portion forms a receiving space for receiving the electrode assembly, The thickness of the above terrace portion is smaller than the thickness of the above main body portion, A battery cell in which the width of the electrode lead side of the above terrace portion is smaller than the width of the body side of the above terrace portion.

3. In paragraph 1, The above foamed refractory member is arranged on the surface of the terrace portion, A battery cell in which the width of the electrode lead side of the above-mentioned foamable refractory member is smaller than the width of the body side of the above-mentioned foamable refractory member.

4. In paragraph 1, The above-mentioned foamable refractory member is a battery cell that expands at a temperature above a predetermined temperature.

5. In paragraph 1, The shape of the above foamed refractory member is a battery cell corresponding to the shape of the above terrace portion.

6. In paragraph 1, The above foamed refractory member is a battery cell that is a paint covering at least a portion of the surface of the terrace portion.

7. In paragraph 1, A porous member disposed between the terrace portion and the foamed refractory member; A battery cell further comprising:

8. In paragraph 7, A battery cell in which the width of the electrode lead side of the porous member is smaller than the width of the main body side of the porous member.

9. In paragraph 7, The shape of the above porous member is a battery cell corresponding to the shape of the above terrace portion.

10. In paragraph 7, The above porous member is a battery cell covering the surface of the terrace portion.

11. In paragraph 7, A battery cell in which the thickness of the porous member is smaller than the thickness of the main body.

12. In paragraph 7, The above porous member is a battery cell having a plurality of through holes.

13. In paragraph 12, The cross-section of each of the above plurality of through holes is a polygon with a preset area, The above plurality of through holes are spaced apart from each other at preset intervals in the battery cell.

14. In paragraph 12, A battery cell wherein at least some of the plurality of through holes are filled with the foamed refractory material.

15. In paragraph 12, The above foamed refractory member is a battery cell passing through at least some of the plurality of through holes.

16. In paragraph 7, A battery cell wherein the thickness of the above foamed refractory member is smaller than the thickness of the above porous member.

17. In paragraph 7, An adhesive member disposed between the terrace portion and the porous member; A battery cell further comprising:

18. In paragraph 17, The above adhesive member is a battery cell that attaches the terrace portion and the foamed refractory member.

19. Assembly case containing a receiving space; A cell assembly arranged in the above-mentioned receiving space; and A busbar assembly disposed between the assembly case and the cell assembly; Including, The above cell assembly comprises a plurality of battery cells, A battery assembly comprising: at least one battery cell of the cell assembly; a cell case including a main body portion that accommodates the electrode assembly and a terrace portion disposed on the outside of the main body portion; an electrode lead extended to the outside of the cell case through the terrace portion; and a foamed refractory member disposed on the side of the terrace portion.

20. In paragraph 19, A battery assembly in which the above-mentioned foamable refractory member is disposed only in battery cells including the foamable refractory member.

21. In paragraph 19, The above-mentioned foamable refractory member is a battery assembly that expands when the temperature of the main body of the battery cell including the foamable refractory member is higher than a preset temperature.

22. Body; and Power supply unit; Including, The above power supply unit includes a battery assembly, The battery assembly comprises an assembly case including a receiving space; a cell assembly disposed in the receiving space; and a busbar assembly disposed between the assembly case and the cell assembly; The above cell assembly comprises a plurality of battery cells, At least one battery cell of the above cell assembly A means of transportation comprising: an electrode assembly; a cell case including a main body portion that accommodates the electrode assembly and a terrace portion disposed on the outside of the main body portion; an electrode lead extended to the outside of the cell case through the terrace portion; and a foamed refractory member disposed on the side of the terrace portion.

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