Secondary battery assembly

Abstract

An embodiment of the present invention relates to a secondary battery assembly including a plurality of cells, a case forming an accommodation space for accommodating the plurality of cells, and a non-combustible gas accommodated in the accommodation space together with the plurality of cells to mitigate or delay heat propagation.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Korean Patent Application No. 10-2023-0092246, filed on Jul. 17, 2023, which is incorporated herein by reference in its entirety. Technical Field

[0002] Embodiments of the present invention relate to a secondary battery assembly. Specifically, embodiments of the present invention relate to a structure of a secondary battery assembly capable of delaying thermal propagation (TP). Background Art

[0003] The working principle of lithium secondary batteries is electrochemical redox reaction. More specifically, the working principle of lithium secondary batteries is to generate electrical energy through the movement of lithium ions between the negative electrode and the positive electrode during the charge and discharge cycle. During the charging process, a voltage is applied to move lithium ions from the positive electrode to the negative electrode. During the discharge cycle, the lithium ions move back from the negative electrode to the positive electrode, and the electrons flow from the negative electrode to the positive electrode through an external circuit, thereby providing current to the load connected to the external circuit. In the case of lithium secondary batteries, during the discharge cycle, the lithium ions in the negative electrode escape from the negative electrode (a process called de-intercalation) and move to the positive electrode through the electrolyte and the separator.

[0004] In recent years, due to the occurrence of fire or explosion accidents during the use of lithium secondary batteries, social concerns about the safety of battery use have been increasing. Based on these social concerns, a major development task for lithium secondary batteries in the near future is to eliminate instabilities such as fire and explosion caused by thermal runaway of secondary battery cells. Summary of the invention

[0005] According to an embodiment of the present invention, the air is air advantageously exhausted from the interior of a secondary battery assembly or the interior of a secondary battery assembly easily filled with an incombustible gas.

[0006] According to embodiments of the present invention, the problem advantageously solved by the embodiments is to minimize or prevent the ignition and explosion of a secondary battery assembly.

[0007] According to yet another embodiment of the present invention, the life span and stability of a secondary battery assembly are greatly improved.

[0008] Moreover, the secondary battery assembly of the present invention can be widely used in electric vehicles using batteries, battery charging stations, energy storage systems (ESS), and green technology fields such as photovoltaic power generation and wind power generation. In addition, the secondary battery assembly of the present invention can be used in environmentally friendly electric vehicles including electric vehicles and hybrid vehicles to prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0009] A secondary battery assembly according to an embodiment of the present invention may include: a plurality of battery cells; a case forming a receiving space for receiving the plurality of battery cells; and a non-combustible gas filled in the receiving space.

[0010] In addition, the secondary battery assembly may further include: first and second holes penetrating the case and communicating with the accommodation space; and first and second closing members connected to the case to close the first and second holes.

[0011] In addition, when the non-combustible gas is injected into the accommodation space through the first hole, at least a portion of the gas in the accommodation space may be discharged through the second hole.

[0012] The first closing member and the second closing member may each include a hole sealing portion for sealing the first hole and the second hole.

[0013] The first hole and the second hole may be formed on one surface of the housing.

[0014] A distance from the first hole to the second hole may be longer than a length of an edge of a surface of the housing.

[0015] The first hole and the second hole may be located diagonally on one surface of the housing.

[0016] The inner diameter size of the first hole may be different from the inner diameter size of the second hole.

[0017] The housing may include: a receiving body including an opening portion at a top; and a receiving cover connected to the receiving body to close the opening portion, and the first hole and the second hole may be located on the receiving cover.

[0018] The housing may further include a body seal portion located between the receiving body and the receiving cover.

[0019] A plurality of the first hole and a plurality of the second hole may be provided respectively.

[0020] The plurality of first holes may be located in a first region adjacent to one edge in one surface of the housing, and the plurality of second holes may be located in a second region different from the first region in one surface of the housing.

[0021] The non-combustible gas may be one selected from the group consisting of nitrogen, argon, helium, carbon dioxide, or a combination thereof.

[0022] The secondary battery assembly may further include: a first hole formed on one side surface of the case; and a second hole formed on the other side surface of the case opposite to the first hole.

[0023] Furthermore, the height of the first hole and the height of the second hole may be different based on the bottom surface of the housing.

[0024] A secondary battery assembly may include: a plurality of battery cells; and a case forming a receiving space for receiving the plurality of battery cells; and a pressure of the receiving space may be maintained at a preset vacuum pressure lower than an air pressure outside the case.

[0025] A secondary battery assembly may include: a plurality of battery cells; and a housing forming a housing space for housing the plurality of battery cells; and an oxygen concentration in the housing space may be maintained below a preset permissible combustion concentration.

[0026] According to one embodiment of the present invention, the air inside the secondary battery assembly can be exhausted or the inside of the secondary battery assembly can be easily filled with a non-combustible gas.

[0027] According to another embodiment of the present invention, fire and explosion of a secondary battery assembly can be minimized or prevented.

[0028] According to still another embodiment of the present invention, the life span and stability of a secondary battery assembly can be improved.

[0029] The above and other features and advantages will be better understood through the following drawings and detailed description of the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A simplified schematic diagram showing an exploded view of a secondary battery assembly according to an embodiment of the present invention.

[0031] Figure 2 A housing according to an embodiment of the present invention is shown.

[0032] Figure 3 A and Figure 3 B shows a first hole and a second hole according to an embodiment of the present invention.

[0033] Figure 4A and Figure 4B Variations of the first hole and variations of the second hole according to an embodiment of the present invention are shown.

[0034] Figure 5 Another secondary battery assembly according to an embodiment of the present invention is shown.

[0035] Figure 6 Still another secondary battery assembly according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0036] Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The configuration or control method of the device described below is only used to describe the embodiments of the present invention and is not intended to limit the scope of the present invention. The same reference numerals used throughout the specification represent the same components.

[0037] Specific terms used in this specification are for convenience of description only and are not intended to limit the described embodiments.

[0038] As used in this specification, a singular expression includes a plural expression unless the context clearly dictates otherwise.

[0039] Figure 1 An exploded simplified schematic diagram of a secondary battery assembly 300 according to an embodiment of the present invention is shown.

[0040] The secondary battery assembly 300 according to the embodiment of the present invention is a general term for a battery module or a battery pack. A battery module refers to a secondary battery assembly in which a plurality of cells are combined in one or more quantities and placed in a housing to protect them from external impact, heat, vibration, etc. In addition, a battery pack refers to a secondary battery assembly that accommodates a predetermined number of battery modules to achieve a final desired voltage or power.

[0041] In addition, the secondary battery assembly 300 according to the embodiment of the present invention may refer to a cell-to-pack (CTP) structured battery that generates a desired voltage or power by accommodating a predetermined number of cells and omitting a battery module.

[0042] Reference Figure 1 The secondary battery assembly 300 according to the embodiment of the present invention may include a plurality of battery cells 110 (see Figure 2 ) and a shell forming a receiving space 319 for receiving a plurality of battery cells 110.

[0043] Reference Figure 1 , a plurality of battery cells 110 are combined together in a certain number and accommodated in a battery module 200, and the battery module 200 may be accommodated in a housing 310. Therefore, a secondary battery assembly 300 according to an embodiment of the present invention may include: a battery module 200 including a plurality of battery cells 110; and a housing 310 forming an accommodation space 319 for accommodating the battery module 200.

[0044] The secondary battery assembly 300 according to the embodiment of the present invention may include a non-combustible gas G filled into the accommodation space 319 to prevent the battery cell 110 or the battery module 200 from catching fire or exploding. Since the non-combustible gas G is generally colorless and transparent, and the space filled with the non-combustible gas G is the accommodation space 319, Figure 1 In FIG. 3 , the accommodation space 319 and the non-combustible gas are shown as being directed to the same position.

[0045] However, in some embodiments, the non-combustible gas G may be a colored or opaque gas. When the non-combustible gas G is colored or opaque, leakage from the housing 310 may be visually confirmed.

[0046] Generally speaking, non-combustible gas G refers to a gas that cannot burn by itself and is not combustible when combined with other substances. Therefore, non-combustible gas refers to a gas that is not related to combustion.

[0047] For example, the non-combustible gas G may be an inert gas (or rare gas) such as water vapor (H2O), nitrogen (N2), carbon dioxide (CO2), helium (He), argon (AR), etc. Other examples of the non-combustible gas G include chlorofluorocarbons (CFCs) such as Freon gas.

[0048] Considering the operating temperature of the secondary battery assembly 300 including the battery cell 110 and environmental pollution, the non-combustible gas G may be preferably selected from one of the group consisting of nitrogen, argon, helium, carbon dioxide, or a combination thereof.

[0049] In addition, the non-combustible gas G may include other colored gases as described above.

[0050] When the non-combustible gas G is filled into the accommodating space 319, the non-combustible gas can minimize the contact between the multiple battery cells 110 or the battery module 200 and oxygen, so that the non-combustible gas can minimize or suppress the fire or explosion of the multiple battery cells 110 or the battery module 200.

[0051] To this end, the non-combustible gas G may be filled into the accommodation space 319 at a preset filling pressure.

[0052] Also, the secondary battery assembly 300 according to another embodiment of the present invention may maintain the pressure of the accommodation space 319 at a preset vacuum pressure lower than the air pressure outside the case 310 , instead of filling the accommodation space 319 with the combustible gas G.

[0053] In order to minimize or prevent the explosion and ignition of the plurality of battery cells 110 or the battery module 200 located in the accommodation space 319, the contact with oxygen in the air must be delayed or prevented as much as possible. To this end, the accommodation space 319 may be filled with a non-flammable gas G at a filling pressure, or, alternatively, the interior of the accommodation space 319 may be maintained at a vacuum pressure.

[0054] That is, it is designed to fill the accommodation space 319 with non-combustible gas G or maintain the accommodation space 319 in a state close to vacuum to reduce the oxygen concentration in the accommodation space 319. This is because when the oxygen concentration in the accommodation space 319 is maintained lower than the combustible oxygen concentration in the battery cell 110 or the battery module 200, the ignition and explosion of the battery cell 110 or the battery module 200 can be minimized.

[0055] The secondary battery assembly 300 according to the embodiment of the present invention can maintain the oxygen concentration in the accommodation space 319 below a preset allowable combustion concentration. The allowable combustion concentration may vary according to the volume of the case 310, the number of battery cells 110, and the degree of progress of thermal runaway.

[0056] The housing 310 may include: a housing body 311 including an opening portion 3111 at the top; and a housing cover 317 connected to the housing body 311 and adapted to close the opening portion 3111. The housing body 311 may accommodate a plurality of battery cells 110 or battery modules 200 through the opening portion 3111. The housing cover 317 may be connected to the housing body 311 to close the opening portion 3111.

[0057] Even when the opening 3111 is closed, the empty space of the accommodation space 319 may be filled with air. Therefore, the air contained in the accommodation space 319 should be replaced with the non-flammable gas G. The empty space of the accommodation space 319 refers to the space that is usually filled with air after the plurality of battery cells 110 are contained in the accommodation space 319.

[0058] In contrast, the secondary battery assembly 300 according to the embodiment of the present invention may exhaust the air contained in the containing space 319 and maintain the pressure of the containing space 319 lower than the vacuum pressure.

[0059] To this end, the secondary battery assembly 300 may include first and second holes 321 and 325 penetrating the case 310 and communicating with the accommodation space 319. In addition, the secondary battery assembly 300 may include first and second closing members 322 and 326 closing the first and second holes 321 and 325.

[0060] The secondary battery assembly 300 may fill the accommodation space 319 with the non-combustible gas G or exhaust the air in the accommodation space 319 through the first hole 321 and the second hole 325 to maintain a vacuum pressure.

[0061] In addition, the secondary battery assembly 300 may close the first hole 321 and the second hole 325 using the first closing member 322 and the second closing member 326 to block the inside of the accommodation space 319 from the outside.

[0062] In addition, the secondary battery assembly 300 may further include a body seal 318 between the housing body 311 and the housing cover 317. The body seal 318, the first closure member 322, and the second closure member 326 may minimize or prevent the gas contained in the housing space 319 from leaking to the outside or the air outside the housing from flowing into the inside of the housing space 319.

[0063] The first hole 321 and the second hole 325 may be formed on one surface of the housing 310. The first hole 321 and the second hole 325 may be located on the same surface of the housing 310.

[0064] A surface of the housing 310 may refer to any of the following surfaces: a bottom surface 313 of the housing supporting the plurality of battery cells 110 (see Figure 5 ), a side surface of the shell (not shown) extending from any edge of the bottom surface 313 of the shell toward the opening portion 3111 to form a accommodating space 319 together with the bottom surface 313 of the shell, and a top surface of the accommodating space 319 or the accommodating cover 317.

[0065] Preferably, the first hole 321 and the second hole 325 may be formed to penetrate the top surface of the accommodation space 319 (not shown) or the accommodation cover 317. Therefore, the first closing piece 322 and the second closing piece 326 may be connected to the top surface of the accommodation space 319 or the accommodation cover 317 to close the first hole 321 and the second hole 325.

[0066] For example, the first closing member 322 and the second closing member 326 may be connected to the top surface of the receiving space 319 or the receiving cover 317 by welding. The receiving cover 317 and the receiving body 311 may also be connected by welding.

[0067] Figure 2 A housing 311 according to an embodiment of the present invention is shown. Figure 2 An example is shown in which the shape of the housing body 311 is asymmetrical in the X direction. This is in consideration of the fact that the secondary battery assembly 300 is generally located at the bottom of an electric vehicle. However, on the contrary, the housing body 311 and the housing cover 317 may have a symmetrical shape, such as a rectangular shape.

[0068] The housing 311 may house the battery module 200 or the plurality of battery cells 110 therein. The housing 311 may include a partition frame 330 for partitioning the battery module 200 or the plurality of battery cells 110 into a plurality of sections. The partition frame 330 may partition the housing space 319 into a plurality of spaces. The battery module 200 or the plurality of battery cells 110 may be separately located in the plurality of spaces.

[0069] The partition frame 330 may be used to enhance the strength of the receiving body 311. The partition frame 330 may include a first frame 333 extending along the X direction and a second frame 335 extending along the Y direction between the battery modules 200 or the plurality of battery cells 110.

[0070] The secondary battery assembly 300 may further include a sensing portion 650 for measuring the pressure of the non-combustible gas G filled in the accommodation space 319. The sensing portion 650 may be configured to sense that the pressure of the accommodation space 319 is lower than a preset sensing pressure. Therefore, when the non-combustible gas G leaks from the secondary battery assembly 300, the sensing portion 650 may sense that the pressure of the accommodation space 319 is lower than the preset sensing pressure.

[0071] On the contrary, when the internal pressure of the accommodation space 319 is maintained at a vacuum pressure lower than the external pressure, the sensing part 650 may sense that the pressure of the accommodation space 319 increases beyond the vacuum pressure.

[0072] Figure 3 A and Figure 3 B shows a first hole 321 and a second hole 325 according to an embodiment of the present invention.

[0073] As described above, the secondary battery assembly 300 may fill the accommodation space 319 with the non-combustible gas G or exhaust the air in the accommodation space 319 through the first hole 321 and the second hole 325 to maintain the vacuum pressure.

[0074] For example, refer to Figure 3 A, the non-combustible gas G can be injected into the accommodating space 319 through the first hole 321, and the gas remaining in the accommodating space 319 can be discharged through the second hole 325.

[0075] When the non-combustible gas G is injected through the first hole 321 , the air inside the accommodating space 319 may be discharged through the second hole 325 . After a certain period of time, the non-combustible gas may also be discharged through the second hole 325 .

[0076] In addition, the secondary battery assembly 300 may check whether the non-combustible gas G is filled into the accommodation space 319 through the second hole 325 to a preset target amount.

[0077] When the discharge of the non-combustible gas G through the second hole 325 is sensed, the secondary battery assembly 300 according to the embodiment of the present invention may stop injecting the non-combustible gas G and close the first hole 321 and the second hole 325 with the first closing member 322 and the second closing member 326 , respectively.

[0078] The inner diameter of the first hole 321 may be different from the inner diameter of the second hole 325 .

[0079] Since the first hole 321 allows the non-combustible gas G to flow therethrough, and the second hole 325 should discharge the residual gas in the accommodating space 319 to maintain the pressure in the accommodating space 319 above a certain level, the size of the first hole 321 may be larger than that of the second hole 325 .

[0080] Since the first hole 321 and the second hole 325 have different functions, the first hole 321 and the second hole 325 may preferably be spaced apart from each other by a certain distance or longer.

[0081] Reference Figure 3 A, the first hole 321 and the second hole 325 may be diagonally located on the receiving cover 317 . Figure 3 A shows the positions of the first hole 321 and the second hole 325 using the top surface of the accommodation space 319 or the accommodation cover 317, but the first hole 321 and the second hole 325 may be located at any position on one side of the housing 310. The diagonal arrangement of the first hole 321 and the second hole 325 allows the inflammable gas G to be retained as much as possible when the inflammable gas G pushes out the air in the accommodation space 319.

[0082] like Figure 3 As shown in Figure A, when the receiving cover 317 is rectangular, any pair of edges 3175 and 3177 of two pairs of opposite edges among the four edges of the receiving cover 317 will be longer than the other pair of edges 3171 and 3173. The other pair of edges 3171 and 3173 may refer to a pair of relatively short edges, while the pair of edges 3175 and 3177 may refer to a pair of relatively long edges.

[0083] At this time, the first hole 321 may be located closer to the edge 3171 than the edge 3173. Likewise, the second hole 325 may be located closer to the edge 3173 than the edge 3171.

[0084] Likewise, the first hole 321 may be located closer to 3175 of the pair of long edges 3175 and 3177 than to the edge 3177. Likewise, the second hole 325 may be located closer to the edge 3177 than to the edge 3175.

[0085] Therefore, the first hole 321 and the second hole 325 may be diagonally located on the receiving cover 317 .

[0086] A distance D1 from the center of the first hole 321 to the center of the second hole 325 may be greater than a length (L1 or L2) of an edge of the accommodating cover 317 on the top surface of the accommodating space 319 or a length of an edge of the accommodating cover 317 on the accommodating cover 317 or a length of an edge of the top surface of the accommodating space 319.

[0087] In some embodiments, an external device (also referred to herein as a discharge device) (not shown) may be used to discharge gas through the second hole 325 and / or to confirm the filling of the non-combustible gas G. Another external device (also referred to herein as an injection device) (not shown) may be used to inject the non-combustible gas G through the first hole 321. The injection device and the discharge device may be connected to the first hole 321 and the second hole 325, respectively. Placing the first hole 321 and the second hole 325 diagonally, as far away from each other as possible, can help prevent one device from interfering with another device and clearly distinguish them.

[0088] In addition, the housing 310 should be able to withstand a pressure of more than 6 bar, which may be generated when the plurality of battery cells 110 accommodated in the housing 310 experience thermal runaway.

[0089] For this purpose, refer to Figure 3 B, the secondary battery assembly 300 may include a hole sealing portion 323 and a hole sealing portion 327 located between the first hole 321 and the first closing member 322 and between the second hole 325 and the second closing member to seal the first hole 321 and the second hole 325, respectively.

[0090] Figure 4A and Figure 4B A variation of the first hole 321 and a variation of the second hole 325 according to an embodiment of the present invention are shown. Figure 4A and Figure 4B As shown, a plurality of the first hole 321 and a plurality of the second hole 325 may be provided respectively.

[0091] The secondary battery assembly 300 may include a plurality of first holes 321 and a plurality of second holes 325 on the top surface of the receiving space 319 or the receiving cover 317 .

[0092] The number of the first holes 321 may be the same as the number of the second holes 325. However, on the contrary, when the non-combustible gas G can be injected through the plurality of first holes 321, the gas remaining in the accommodation space 319 can be discharged through the second holes 325, and the filling of the non-combustible gas G is confirmed, the number of the first holes 321 may be different from the number of the second holes 325.

[0093] Reference Figure 4A When the plurality of first holes 321 and the plurality of second holes 325 are each set to two, the two first holes 321 and the two second holes 325 may be disposed adjacent to a corner where a pair of short edges 3171 and 3173 and a pair of long edges 3175 and 3177 intersect.

[0094] Reference Figure 4A, the spacing between the plurality of first holes 321 may be smaller than the spacing between the first hole 321 in the plurality of first holes 321 and the second hole 325 in the plurality of second holes 325. In this document, the spacing refers to the length from the center of one hole to the center of another hole.

[0095] Likewise, a spacing between the plurality of second holes 325 may be smaller than a spacing between a first hole 321 in the plurality of first holes 321 and a second hole 325 in the plurality of second holes 325 .

[0096] For this purpose, refer to Figure 4B , multiple first holes 321 can be located in a first area A1 adjacent to a first edge of a surface of the shell 310, and multiple second holes 325 can be located in a second area A2 different from the first area and adjacent to an edge opposite to the first edge of the shell 310.

[0097] Preferably, multiple first holes 321 can be located in a first area A1 adjacent to an edge of the top surface of the accommodating space 319 or an edge of the accommodating cover 317, and multiple second holes 325 can be located in a second area A2 of the top surface of the accommodating space 319 or the accommodating cover 317 that is different from the first area.

[0098] For example, the first area A1 may be located closer to the edge 3171 of the pair of short edges 3171 and 3173 , and the second area A2 may be located relatively closer to the other edge 3173 .

[0099] Figure 5 Another secondary battery assembly 300 according to an embodiment of the present invention is shown.

[0100] Reference Figure 5 , the first hole 321 and the second hole 325 may be formed to penetrate a side surface of the accommodation space 319 , ie, a side surface of the housing 310 .

[0101] The case 310 may include a bottom surface 313 of the case supporting the plurality of battery cells 110 and two opposite side surfaces 314 and 315 of side surfaces of the accommodation space 319 extending from any pair of opposite edges of four edges of the bottom surface 313 of the case.

[0102] The first hole 321 may be formed on the side surface 314 of the two opposite side surfaces 314 and 315 of the housing, and the second hole 325 may be formed on the opposite side surface 315 of the housing. It is worth noting that the two opposite side surfaces 314 and 315 are only examples, and the first hole 321 and the second hole 325 may also be formed on two opposite side surfaces in another direction.

[0103] In addition, the first hole 321 and the second hole 325 may be provided in plural.

[0104] Positions of the first hole 321 and the second hole 325 may differ based on the bottom surface 313 of the housing. Since the molecular weight of air in the accommodation space 319 is different from that of the incombustible gas G, in order to effectively exhaust the air in the accommodation space 319 and fill the incombustible gas G, the height H1 of the first hole 321 and the height H2 of the second hole 325 may be different.

[0105] Figure 6 Still another secondary battery assembly 400 according to an embodiment of the present invention is shown.

[0106] As described above, the secondary battery assembly 400 according to the embodiment of the present invention can be applied not only to a battery pack but also to a battery module 200. Figure 6 , the secondary battery assembly 400 may include: a housing 210 (not shown) accommodating a plurality of battery cells; a first hole 221 and a second hole 225 formed to penetrate the housing 210; and a first closing member 222 and a second closing member 226 connected to the housing 210 to close the first hole 221 and the second hole 225. The secondary battery assembly 400 may be injected with a non-combustible gas (not shown) through the first hole 221 and the second hole 225, and the filling of the non-combustible gas is confirmed.

[0107] Embodiments of the present invention can be modified and implemented in various forms, and its scope is not limited to the above-mentioned embodiments. Therefore, if the modified embodiment includes parts of the present invention, it should be considered to fall within the scope of rights of the present invention. In addition, the embodiments can be combined to form other embodiments.

Claims

1. A secondary battery assembly, comprising: Multiple cells; A housing is formed to contain the plurality of battery cells; as well as The containing space is filled with a non-combustible gas.

2. The secondary battery assembly according to claim 1, further comprising: A first hole and a second hole penetrating the housing and communicating with the accommodation space; as well as A first closure member and a second closure member are connected to the housing to close the first hole and the second hole.

3. The secondary battery assembly according to claim 2, wherein: When the non-combustible gas is injected into the accommodation space through the first hole, at least a portion of the gas in the accommodation space is discharged through the second hole.

4. The secondary battery assembly according to claim 2, wherein: The first closing member and the second closing member each include a hole sealing portion for sealing the first hole and the second hole.

5. The secondary battery assembly according to claim 2, wherein: The first hole and the second hole are formed on one surface of the housing. 6 . The secondary battery assembly of claim 5 , wherein a distance from the first hole to the second hole is longer than a length of one edge of one surface of the case.

7. The secondary battery assembly according to claim 5, wherein: The first hole and the second hole are diagonally located on one surface of the housing.

8. The secondary battery assembly according to claim 2, wherein: The inner diameter of the first hole is different from the inner diameter of the second hole.

9. The secondary battery assembly according to claim 2, wherein: The housing includes: a housing body including an opening portion at a top; and a housing cover connected to the housing body to close the opening portion, wherein the first hole and the second hole are located on the housing cover. 10 . The secondary battery assembly according to claim 9 , wherein the case further comprises a body sealing portion between the housing body and the housing cover. 11 . The secondary battery assembly according to claim 2 , wherein the first hole and the second hole are respectively provided in plural numbers.

12. The secondary battery assembly according to claim 11, wherein: The plurality of first holes are located in a first region adjacent to one edge in one surface of the housing, and the plurality of second holes are located in a second region different from the first region in one surface of the housing. 13 . The secondary battery assembly according to claim 1 , wherein the non-combustible gas is one selected from the group consisting of nitrogen, argon, helium, and carbon dioxide, or a combination thereof.

14. The secondary battery assembly according to claim 1, further comprising: a first hole formed on a side surface of the housing; as well as A second hole is formed on the other side surface of the housing opposite to the first hole. 15 . The secondary battery assembly of claim 14 , wherein a height of the first hole and a height of the second hole are different based on a bottom surface of the case.

16. A secondary battery assembly comprising: Multiple cells; as well as A housing is formed to contain the plurality of battery cells; The pressure of the accommodating space is maintained at a preset vacuum pressure lower than the air pressure outside the housing.

17. A secondary battery assembly comprising: Multiple cells; as well as A housing is formed to contain the plurality of battery cells; The oxygen concentration in the containing space is maintained below a preset allowable combustion concentration.

18. A secondary battery assembly comprising: A housing is formed to accommodate a plurality of battery cells. a first hole and a second hole formed on the housing and penetrating the housing to be in fluid communication with the accommodation space, a first closing member and a second closing member configured to close the first hole and the second hole, respectively, and The non-combustible gas filled in the containing space, wherein the size of the first hole is larger than the size of the second hole, and When the non-combustible gas is injected into the accommodation space through the first hole, at least a portion of the gas in the accommodation space is discharged through the second hole.

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