Battery pack

Abstract

The battery pack of the present disclosure includes: a pack case including a lower case formed with a through hole; a plurality of battery cells disposed on the lower case; a cross member having a lower end hole and a first side end hole communicating with the through hole formed therein, the cross member being disposed between the plurality of battery cells in the lower case; and a liquid curing member which is injected through the through hole.

Description

Technical Field

[0001] The present disclosure relates to a secondary battery, and in particular to a battery pack. Background Art

[0002] Secondary batteries can be reused after multiple charging and discharging. Secondary batteries are widely used in the industry due to their economical and environmentally friendly characteristics. Secondary batteries are used as battery packs in vehicles and the like. The battery pack includes a plurality of battery cells electrically connected to each other and a housing for protecting the battery cells. A solution for improving the rigidity and cooling performance of the housing is required. Summary of the invention

[0003] One of several objects of the present disclosure is to provide a battery pack capable of improving rigidity and cooling performance.

[0004] The present disclosure can be widely used in green technology fields such as solar power generation, wind power generation, etc. In addition, the present disclosure can be used in environmental protection devices such as electric vehicles and hybrid vehicles for preventing climate change by suppressing air pollution and greenhouse gas emissions.

[0005] According to an embodiment, the battery pack includes: a battery pack shell, which includes a lower shell formed with a perforation; a plurality of battery cells, which are arranged on the lower shell; a cross component, on which a lower end hole and a first side end hole connected to the perforation are formed, and the cross component is arranged between the plurality of battery cells in the lower shell; and a liquid curing component, which is injected through the perforation.

[0006] In an embodiment, the cross component may include: a lower end component having a lower end hole formed thereon; an upper end component disposed on an upper portion of the lower end component; and a side end component having a first side end hole formed thereon and combined with the lower end component and the upper end component.

[0007] In an embodiment, the cross component may further include: a middle end component, which is arranged between the lower end component and the upper end component and is combined with the side end component.

[0008] In an embodiment, the height of the first side end hole based on the lower end member may be lower than the height of the middle end member based on the lower end member.

[0009] In an embodiment, the liquid curing component may be injected through the through hole, the lower end hole, the first flow path between the lower end component and the middle end component, and the first side end hole.

[0010] In an embodiment, a second side end hole may be further formed in the side end member, and a height of the second side end hole based on the lower end member is higher than a height of the middle end member based on the lower end member.

[0011] In an embodiment, the height of the liquid-cured part based on the lower end part may be lower than the height of the second side end hole based on the lower end part.

[0012] In an embodiment, it may be that the gas generated in any one of the plurality of battery cells moves along the second flow path between the upper end member and the middle end member through the second side end hole.

[0013] In an embodiment, the battery may further include: a bus bar electrically connected to an electrode tab included in one of the plurality of battery cells; and an insulating cover having a vent hole formed therein and surrounding an outer end of the bus bar.

[0014] In an embodiment, it may be that the gas generated in any one of the plurality of battery cells moves through the exhaust hole, the second side end hole, and the second flow path between the upper end member and the middle end member.

[0015] In an embodiment, the height of the liquid solidified part based on the lower end part may be lower than the height of the exhaust hole based on the lower end part.

[0016] In an embodiment, an injection hole for injecting the liquid curing component may be formed in the insulating cover, and a height of the injection hole based on the lower end component is lower than a height of the exhaust hole based on the lower end component.

[0017] In an embodiment, the first side end hole may be opposite to the electrode tab or the bus bar.

[0018] In an embodiment, the lower housing may include: an upper plate on which a plurality of battery cells and a cross member are disposed; a lower plate disposed below the upper plate; and a heat sink disposed between the lower plate and the upper plate.

[0019] In an embodiment, the liquid curing component may be injected into between the lower plate and the heat sink through the perforation.

[0020] In an embodiment, the method may further include: a stopper inserted into the through hole after the liquid curing component is injected.

[0021] In an embodiment, it may be that the liquid-curable component includes polyurethane.

[0022] The present disclosure may provide a battery pack for improving rigidity and cooling performance.

[0023] The present disclosure can simplify the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a top view of a battery pack according to an embodiment.

[0025] Figure 2FIG. 1 is a diagram for explaining a battery pack case according to an embodiment.

[0026] Figure 3 and Figure 4 FIG. 1 is a diagram for explaining an injection path of a liquid curing component according to an embodiment.

[0027] Figure 5 is a cross-sectional view of a battery pack including a liquid-curable component according to an embodiment.

[0028] Figure 6 FIG. 1 is a diagram for explaining a lower housing according to an embodiment.

[0029] Figure 7 is a cross-sectional view of a battery pack according to an embodiment.

[0030] Reference numerals:

[0031] 10, 10a: battery pack, 110: battery cell, 200: battery pack housing, 210: lower housing, 300: cross member, 400: liquid curing member, 500: stopper DETAILED DESCRIPTION

[0032] The structural or functional descriptions of the embodiments disclosed in this specification or application are merely illustrative for the purpose of illustrating the embodiments of the technical concepts according to the present invention. In addition to the embodiments disclosed in this specification or application, the embodiments of the technical concepts according to the present invention can also be implemented in various forms, and the technical concepts of the present invention are not limited to the embodiments described in this specification or application.

[0033] Figure 1 is a top view of a battery pack according to an embodiment. Figure 2 FIG. 1 is a diagram for explaining a battery pack case according to an embodiment. Figure 1 This is a top view of the battery pack in the xy plane. Figure 2 This is a perspective view of the battery pack casing relative to the xyz axis.

[0034] refer to Figure 1 and Figure 2 , the battery pack 10 may include a plurality of battery cells 110 , a pack case 200 , and a cross member 300 .

[0035] Each of the plurality of battery cells 110 may be a secondary battery capable of repeated charge and discharge. In an embodiment, for example, the battery cells 110 may be various types of secondary batteries such as lithium ion batteries, vanadium ion batteries, all-solid-state batteries, metal air batteries, sodium ion batteries, and aluminum ion batteries.

[0036] The battery pack housing 200 can accommodate a plurality of battery cells 110. In an embodiment, the battery pack housing 200 may include a lower housing 210, an upper housing (not shown), and a side housing 230. For example, the lower housing 210 and the upper housing may be spaced apart in the height direction. For example, the height direction may be the z-axis direction. The side housing 230 may be combined with the lower housing 210 and the upper housing. The side housing 230 may surround the side ends of the lower housing 210 and the upper housing. Among them, the lower housing 210, the upper housing, and the side housing 230 may be combined with each other in various ways. In an embodiment, the lower housing 210, the upper housing, and the side housing 230 may be manufactured by independent components, thereby combining with each other by bolts, welding, etc. In another embodiment, the lower housing 210, the upper housing, and the side housing 230 may be manufactured by an integral component. In this case, the lower housing 210, the upper housing, and the side housing 230 may be combined with each other to form the internal space of the battery pack housing 200.

[0037] The cross component 300 may be disposed on the lower housing 210. The cross component 300 may divide the internal space of the battery pack housing 200 into a plurality of accommodation spaces 250. For example, the cross component 300 may include at least one of a "-" shape and a "+" shape. In this case, the accommodation space 250 may be a space surrounded by the side housing 230, the lower housing 210, the upper housing, and the cross component 300. A plurality of battery cells 110 may be configured in each of the plurality of accommodation spaces 250. In addition, the cross component 300 may be combined with at least one of the lower housing 210 and the side housing 230. In an embodiment, the cross component 300 may be manufactured by an independent component and then combined with at least one of the lower housing 210 and the side housing 230 by bolts, welding, etc. In another embodiment, the cross component 300 may be manufactured by an integral component with at least one of the lower housing 210 and the side housing 230.

[0038] In an embodiment, the cross member 300 may include at least one of various materials such as aluminum, stainless steel (Steel Use Stainless, SUS), and engineering plastics.

[0039] A plurality of battery cells 110 may be stacked in one direction in the accommodation space 250. For example, the one direction may be the x-axis direction, but this is only one embodiment, and the embodiment may be modified to be in the y-axis direction.

[0040] In an embodiment, a first side hole 331h may be formed in the intersection part 300. The first side hole 331h may be a portion of a path for injecting a liquid solidifying component. In an embodiment, a second side hole 333h may be formed in the intersection part 300. The second side hole 333h may be a portion of a path for discharging gas of the battery cell 110.

[0041] Figure 3 and Figure 4 FIG. 1 is a diagram for explaining an injection path of a liquid curing component according to an embodiment. Figure 3 is a top view showing the battery pack on the xy plane, Figure 4 It is shown Figure 3 Figure 1 is a diagram of the A1-A2 section.

[0042] refer to Figure 3 and Figure 4 , a plurality of battery cells 110 and a cross member 300 may be disposed on the lower case 210 . The cross member 300 may be disposed between the plurality of battery cells 110 .

[0043] The battery cell 110 may include a main body 111 and an electrode tab 115. The main body 111 may include an electrode assembly. The electrode assembly may include an electrode and an electrolyte. The electrode may include a positive electrode (Cathode) and a negative electrode (Anode). In an embodiment, the electrode assembly may further include a diaphragm to prevent contact between the positive electrode and the negative electrode. In an embodiment, the main body 111 may further include an outer package surrounding the electrode assembly. For example, the outer package may be implemented as various types such as a soft package type, a square type, a cylindrical type, etc. The electrode tab 115 may protrude in the horizontal direction from the main body 111. For example, the horizontal direction may be the y-axis direction or the x-axis direction. The electrode tab 115 may be electrically connected to the electrode of the electrode assembly. For example, the electrode tab 115 may include a first electrode tab electrically connected to the positive electrode and a second electrode tab electrically connected to the negative electrode.

[0044] A through hole 210h may be formed in the lower housing 210. The through hole 210h may be a hole penetrating in the height direction. The height direction may be, for example, the z-axis direction.

[0045] A lower end hole 310h may be formed in the cross member 300. The lower end hole 310h may be a hole that penetrates in the height direction. The height direction may be, for example, the z-axis direction. The lower end hole 310h may be connected to the through hole 210h. That is, the lower end hole 310h may be connected to the through hole 210h. Figure 3 and Figure 4, it is described that the positions of the through hole 210h formed on the lower shell 210 and the lower end hole 310h formed on the cross member 300 are equivalent to the A1-A2 section, but this is only an embodiment, and the positions of the through hole 210h and the lower end hole 310h can be deformed and implemented in various positions such as the position of the central part 310p of the cross member 300 on the xy plane. In the embodiment, the number of the through hole 210h and the lower end hole 310h can be implemented as one or more.

[0046] A first side end hole 331h may be formed in the cross member 300. The first side end hole 331h may be a hole penetrating in the horizontal direction. The horizontal direction may be, for example, the x-axis direction or the y-axis direction.

[0047] In an embodiment, the first side end hole 331h may be opposite to the electrode tab 115 or the bus bar 120. That is, the battery cell 110 may be arranged so that the electrode tab 115 or the bus bar 120 faces the first side end hole 331h.

[0048] In an embodiment, a liquid foam may be injected through the perforation 210h. The liquid foam is a material having fluidity, and may solidify after a reference time has passed after the injection. In an embodiment, the liquid foam injected through the perforation 210h may be injected along the Figure 3 and Figure 4 The dotted arrow moves until solidification. For example, the liquid solidifying component injected through the perforation 210h can be filled into the space between the battery cell 110 and the cross component 300 through the lower end hole 310h and the first side end hole 331h. As the injection amount of the liquid solidifying component increases, the height of the liquid solidifying component filled between the battery cell 110 and the cross component 300 can increase. Among them, the height can refer to the length in the height direction based on the lower shell 210. The height direction can be the z-axis direction.

[0049] In a specific embodiment, the cross member 300 may include a lower end member 310 , an upper end member 320 , and a side end member 330 .

[0050] The lower end hole 310h may be formed in the lower end member 310. The upper end member 320 may be disposed at the upper portion of the lower end member 310. For example, the upper end member 320 may be spaced apart from the lower end member 310 in an upper direction. The upper direction may be the z-axis direction. That is, the lower end member 310 may be disposed at the lower portion of the upper end member 320. For example, the lower end member 310 may be spaced apart from the upper end member 320 in a lower direction. The lower direction may be the -z-axis direction. The upper end member 320 and the lower end member 310 may be disposed parallel to each other.

[0051] The side end member 330 may be combined with the side ends of the lower end member 310 and the upper end member 320. In an embodiment, the side end member 330 may extend in the height direction. The height direction may be the z-axis direction. In an embodiment, the lower end member 310, the upper end member 320, and the side end member 330 may be manufactured from an integral member in a state of being combined with each other. In another embodiment, the lower end member 310, the upper end member 320, and the side end member 330 may be manufactured from independent members, and then combined by bolts, welding, etc.

[0052] A first side end hole 331h may be formed in the side end member 330. In an embodiment, a second side end hole 333h may be further formed in the side end member 330. The first side end hole 331h and the second side end hole 333h may be formed by penetrating in a horizontal direction.

[0053] The first side hole 331h of the side member 330 may communicate with the lower hole 310h of the lower member 310 through the first flow path 310v. That is, the first flow path 310v may connect the lower hole 310h and the first side hole 331h to each other. The first flow path 310v may be a hollow space inside the cross member 300.

[0054] In an embodiment, the cross member 300 may further include a middle member 350. The middle member 350 may be disposed between the lower member 310 and the upper member 320. For example, the middle member 350 may be spaced apart from the lower member 310 in an upward direction and spaced apart from the upper member 320 in a downward direction. The middle member 350 may be disposed in parallel with the lower member 310 and the upper member 320. The side ends of the middle member 350 may be combined with the side members 330.

[0055] In an embodiment, the first flow path 310v may be formed between the lower end part 310 and the middle end part 350. In an embodiment, the liquid curing part may be injected through the through hole 210h, the lower end hole 310h, the first flow path 310v, and the first side end hole 331h.

[0056] In an embodiment, the second flow path 320v may be formed between the upper end member 320 and the middle end member 350. The second flow path 320v may be a hollow space inside the cross member 300. The second flow path 320v may be communicated with the second side end hole 333h of the side end member 330. The second side end hole 333h and the second flow path 320v may be equivalent to a channel for discharging gas generated in the battery cell 110.

[0057] In an embodiment, the battery pack 10 may further include a bus bar 120. The bus bar 120 may be electrically connected to the electrode tabs 115 of the battery cell 110. For example, the bus bar 120 may be electrically connected to the electrode tabs 115 of two or more battery cells 110 arranged in the same accommodation space. In an embodiment, the bus bar 120 may include a conductive material having a conductivity higher than a reference value to flow current. Conductivity, as a quantity indicating the degree to which current flows smoothly in an object, represents an inherent property of a substance. For example, the conductive material may include at least one metal of copper, aluminum, gold, silver, iron, tungsten, platinum, and lead.

[0058] In an embodiment, the battery pack 10 may further include an insulating cover 130. The insulating cover 130 may be configured to surround the outer end of the bus bar 120. In an embodiment, the insulating cover 130 may include an insulating material having a conductivity lower than a reference value so that current hardly flows. For example, the insulating material may include at least one of PP (polypropylene), MPPO (modified polyphenylene oxide), PC (polycarbonate) series resin, and rubber.

[0059] The injection hole 131h may be formed in the insulating cover 130. The injection hole 131h may be formed by penetrating in the horizontal direction, for example. The injection hole 131h may be equivalent to a channel for the liquid solidification component to pass into the space between the battery cell 110 and the insulating cover 130.

[0060] The insulating cover 130 may be formed with a vent hole 133h. The vent hole 133h may be formed by penetrating in a horizontal direction, for example. The vent hole 133h may be equivalent to a channel for discharging gas generated in the battery cell 110.

[0061] Figure 5 is a cross-sectional view of a battery pack including a liquid-curable component according to an embodiment. Figure 5 A battery pack is shown injected with a liquid curing component.

[0062] refer to Figure 5 , the battery pack 10a may include a plurality of battery cells 110, a lower housing 210, a cross component 300, and a liquid curing component 400. A perforation 210h may be formed in the lower housing 210. A plurality of battery cells 110 and a cross component 300 may be disposed on the lower housing 210. The cross component 300 may be disposed between the plurality of battery cells 110. A lower end hole 310h and a first side end hole 331h communicating with the perforation 210h may be formed in the cross component 300. The liquid curing component 400 may be injected through the perforation 210h.

[0063] In an embodiment, the liquid curing part 400 may include at least one of an insulating material and a flame retardant material. For example, the insulating material may include at least one of materials such as plastic resin, epoxy, polypropylene, polyurethane, etc. The flame retardant material may include at least one of materials such as silicone, mica, ceramics (e.g., board, cotton), flame retardant rubber, silicon oxide, etc.

[0064] The liquid curing component 400 is injected in a liquid state with fluidity, and after injection, solidification may occur. The liquid curing component 400 may have at least one of insulation and flame retardancy in a solidified state. In this case, the liquid curing component 400 may form a path to guide the gas generated in the battery cell 110 to move along the path. Moreover, the liquid curing component 400 may reduce or prevent thermal runaway of the battery cell 110.

[0065] In one embodiment, the cross member 300 may include a lower end member 310, an upper end member 320, and a side end member 330. In one embodiment, the cross member 300 may further include a middle end member 350.

[0066] In an embodiment, the liquid curing component 400 may be injected through the perforation 210h and filled into the first flow path between the lower end component 310 and the middle end component 350. In an embodiment, the liquid curing component 400 may be injected through the perforation 210h, the first flow path and the first side end hole 331h, and the liquid curing component 400 may be filled into the space between the cross component 300 and the battery cell 110.

[0067] In an embodiment, the battery pack 10a may further include an insulating cover 130. An injection hole 131h may be formed in the insulating cover 130. In this case, the liquid curing part 400 may be injected through the perforation 210h, the first flow path, the first side end hole 331h, and the injection hole 131h, and fill the space between the insulating cover 130 and the battery cell 110.

[0068] The liquid curing component 400 of the present disclosure can improve the structural rigidity of the filled portion. In an embodiment, the liquid curing component 400 can suppress the temperature rise of the battery cell 110. In this case, the liquid curing component 400 can suppress the thermal runaway phenomenon of the battery cell 110.

[0069] In an embodiment, a second side end hole 333 h may be further formed in the side end part 330 .

[0070] In the embodiment, the height h3 of the liquid curing member 400 based on the upper end href of the lower end member 310 may be lower than the height h4 of the second side end hole 333h based on the upper end href of the lower end member 310. This is to prevent the liquid curing member 400 from being injected into the second flow path 320v through the second side end hole 333h.

[0071] In the embodiment, the height h1 of the first side end hole 331h based on the upper end href of the lower end member 310 may be lower than the height h2 of the middle end member 350 based on the upper end href of the lower end member 310. In the embodiment, the height h4 of the second side end hole 333h based on the upper end href of the lower end member 310 may be higher than the height h2 of the middle end member 350 based on the upper end href of the lower end member 310. That is, the first flow path and the second flow path 320v may be divided from each other based on the middle end member 350, and the first flow path and the second flow path 320v are respectively connected to the first flow path and the second flow path 320v.

[0072] In an embodiment, gas generated in any one of the plurality of battery cells 110 may move along the second flow path 320 v between the upper end member 320 and the middle end member 350 through the second side end hole 333 h .

[0073] In an embodiment, the battery pack 10a may further include an insulating cover 130 formed with a vent hole 133h. The vent hole 133h may be connected to the second side end hole 333h. In this case, the gas generated in any one of the plurality of battery cells 110 may be discharged to the outside along the vent hole 133h, the second side end hole 333h, and the second flow path 320v.

[0074] Figure 6 FIG. 1 is a diagram for explaining a lower housing according to an embodiment.

[0075] refer to Figure 6 In an embodiment, the lower housing 210 may include an upper plate 211 , a lower plate 213 , and a heat sink 215 .

[0076] The upper plate 211 may be disposed on the upper portion of the lower plate 213. That is, the lower plate 213 may be disposed on the lower portion of the upper plate 211. The upper plate 211 and the lower plate 213 may be spaced apart from each other in the height direction and disposed in parallel. For example, the height direction may be the z-axis direction. A plurality of battery cells 110 and a cross member 300 may be disposed at the upper end of the upper plate 211.

[0077] The heat sink 215 may be disposed between the lower plate 213 and the upper plate 211. The heat sink 215 may absorb heat from other objects and disperse or transfer the absorbed heat. For example, the heat sink 215 may include a material having a thermal conductivity higher than a reference value.

[0078] In an embodiment, the heat sink 215 may include a first portion in contact with the upper plate 211 and a second portion spaced apart from the upper plate 211 in a height direction. The distance between the first portion and the through hole 210h in the horizontal direction may be smaller than the distance between the second portion and the through hole 210h in the horizontal direction. The horizontal direction may be, for example, the y-axis direction or the z-axis direction. In an embodiment, the heat sink 215 may further include a third portion connecting the first portion and the second portion.

[0079] In an embodiment, the liquid curing component 400 may be injected into the through hole 210h formed on the lower housing 210. In this case, the liquid curing component 400 may be injected between the lower plate 213 and the radiator 215 through the through hole 210h. The liquid curing component 400 injected between the lower plate 213 and the radiator 215 may prevent heat loss of the radiator 215. The liquid curing component 400 injected between the lower plate 213 and the radiator 215 may improve the structural rigidity of the lower housing 210 and prevent damage caused by physical impact.

[0080] Figure 7 is a cross-sectional view of a battery pack according to an embodiment.

[0081] refer to Figure 7 The battery pack 10b may include a plurality of battery cells 110, a lower housing 210, a cross member 300, and a liquid solidification member 400. A perforation 210h (refer to Figure 4 ). A plurality of battery cells 110 and a cross member 300 may be disposed on the lower housing 210. The cross member 300 may be disposed between the plurality of battery cells 110. A lower end hole 310h and a first side end hole 331h communicating with the through hole 210h may be formed in the cross member 300. The liquid curing member 400 may be injected through the through hole 210h.

[0082] In an embodiment, the battery pack 10b may further include a stopper 500. The stopper 500 may be inserted into the through hole 210h after the liquid curing member 400 is injected into the through hole 210h. The stopper 500 may prevent the injected liquid curing member 400 from being discharged through the through hole 210h.

[0083] In an embodiment, the stopper 400 may be implemented by a bolt coupled to the through hole 210h by a thread. In another embodiment, the stopper 500 may be implemented by a rubber or polymer material inserted into the through hole 210h in an interference-insertion manner.

[0084] In an embodiment, the battery pack 10 b may further include an insulating cover 130 .

[0085] In an embodiment, a vent hole 133h for discharging gas generated in the battery cell 110 may be formed in the insulating cover 130. In this case, a height h3 of the liquid solidifying part 400 based on the lower end part 310 may be lower than a height h5 of the vent hole 133h of the insulating cover 130 based on the lower end part 310.

[0086] In an embodiment, an injection hole 131h for injecting the liquid curing member 400 may be formed in the insulating cover 130. The height (not shown) of the injection hole 131h of the insulating cover 130 based on the lower end member 310 may be lower than the height h5 of the exhaust hole 133h of the insulating cover 130 based on the lower end member 310.

Claims

1. A battery pack comprising: A battery pack housing including a lower housing formed with a perforation; A plurality of battery cells, which are arranged on the lower housing; a cross member having a lower end hole and a first side end hole formed thereon and communicating with the through hole, wherein the cross member is disposed between the plurality of battery cells in the lower housing; as well as The liquid curing component is injected through the perforations.

2. The battery pack according to claim 1, wherein: The cross-member comprises: a lower end member having the lower end hole formed thereon; an upper end member disposed on an upper portion of the lower end member; and A side end component is formed with the first side end hole, and the side end component is combined with the lower end component and the upper end component.

3. The battery pack according to claim 2, wherein: The cross-member also includes: The middle end member is disposed between the lower end member and the upper end member and is coupled to the side end member.

4. The battery pack according to claim 3, wherein: The height of the first side end hole based on the lower end member is lower than the height of the middle end member based on the lower end member.

5. The battery pack according to claim 4, wherein: The liquid curing component is injected through the through hole, the lower end hole, the first flow path between the lower end component and the middle end component, and the first side end hole.

6. The battery pack according to claim 4, wherein: A second side end hole is also formed in the side end member. The height of the second side end hole based on the lower end member is higher than the height of the middle end member based on the lower end member.

7. The battery pack according to claim 6, wherein: The height of the liquid solidified component based on the lower end component is lower than the height of the second side end hole based on the lower end component.

8. The battery pack according to claim 6, wherein: Gas generated in any one of the plurality of battery cells moves along a second flow path between the upper end member and the middle end member through the second side end hole.

9. The battery pack according to claim 6, wherein: The battery pack further comprises: a bus bar electrically connected to an electrode tab included in one of the plurality of battery cells; and An insulating cover is formed with exhaust holes therein, and the insulating cover surrounds the outer end of the bus bar.

10. The battery pack according to claim 9, wherein: Gas generated in any one of the plurality of battery cells moves through the exhaust hole, the second side end hole, and a second flow path between the upper end member and the middle end member.

11. The battery pack according to claim 9, wherein: The height of the liquid solidifying member based on the lower end member is lower than the height of the exhaust hole based on the lower end member.

12. The battery pack according to claim 9, wherein: The insulating cover is provided with an injection hole for injecting the liquid curing component. The height of the injection hole based on the lower end member is lower than the height of the exhaust hole based on the lower end member.

13. The battery pack according to claim 9, wherein: The first side end hole is opposite to the electrode tab or the bus bar.

14. The battery pack according to claim 1, wherein: The lower housing comprises: an upper plate on which the plurality of battery cells and the cross member are disposed; a lower plate disposed at a lower portion of the upper plate; and The heat sink is arranged between the lower plate and the upper plate.

15. The battery pack according to claim 14, wherein: The liquid curing component is injected into between the lower plate and the heat sink through the through hole.

16. The battery pack according to claim 1, wherein: The battery pack further comprises: A stopper is inserted into the through hole after the liquid curing component is injected.

17. The battery pack according to claim 1, wherein: The liquid curing component includes at least one of an insulating material and a flame retardant material.

Images