Battery pack

Abstract

A battery pack is disclosed. The battery pack includes: a base plate; the lower battery module is positioned on the upper surface of the bottom plate; an inner cover including a top portion covering an upper surface of the lower battery module and having a flow path formed therein; and an upper battery module mounted on an upper surface of the inner cover.

Description

Technical Field

[0001] This disclosure relates to a battery pack.

[0002] This application claims priority to Korean Patent Application No. 10-2024-0030734, filed on March 4, 2024, the disclosure of which is incorporated herein by reference. Background Technology

[0003] With the rapid growth in demand for portable electronic products such as laptops, cameras, and mobile phones, as well as the full commercialization of robots and electric vehicles, research is actively underway on high-performance rechargeable batteries.

[0004] Currently, rechargeable batteries available on the market include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium rechargeable batteries. Among these rechargeable batteries, lithium rechargeable batteries have little or no memory effect, so they receive more attention than nickel-based rechargeable batteries because they have the advantages of being able to be charged at any convenient time, having a very low self-discharge rate, and high energy density.

[0005] Lithium-ion secondary batteries mainly consist of lithium-based oxides and carbon materials used as positive and negative electrode active materials, respectively. A lithium-ion secondary battery includes: an electrode assembly comprising a positive electrode plate and a negative electrode plate coated with positive and negative electrode active materials, respectively, with a separator between the positive and negative electrode plates; and a battery casing for housing and sealing the electrode assembly and electrolyte solution together.

[0006] Generally, based on the shape of the battery casing, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is contained in a metal can and pouch-type secondary batteries in which the electrode assembly is contained in a pouch of aluminum laminate.

[0007] Recently, secondary batteries have been widely used in medium and large devices such as electric vehicles and energy storage systems (ESS) for driving and storing electrical energy, as well as small devices such as portable electronic devices. Multiple secondary batteries can be electrically connected and stored inside a module housing to form a battery module. Alternatively, multiple battery modules can be connected to each other to form a battery pack.

[0008] However, if multiple secondary batteries (cells) or multiple battery modules are crammed into a small space, they may be susceptible to thermal events. Specifically, if an event such as thermal runaway occurs in a single cell, it can generate high-temperature gases, flames, or heat. If these gases, flames, or heat are transferred to other cells within the same battery module, a chain reaction of explosions, such as heat propagation, may occur. Furthermore, this chain reaction can not only cause fires or explosions in the corresponding battery module, but may also lead to fires or explosions in other battery modules.

[0009] Furthermore, in the case of medium to large battery packs, such as those in electric vehicles, which include a large number of battery cells and modules to increase output and / or capacity, the risk of thermal cascading reactions may be further increased. Additionally, where the battery pack is installed in the electric vehicle, users such as the driver may be nearby. Therefore, if a thermal event occurring in a particular battery cell or module is not properly controlled and a chain reaction occurs, it could not only cause significant property damage but also personal injury. Therefore, it is necessary to properly control thermal events occurring in battery cells or modules to improve the thermal stability of the battery pack. Summary of the Invention

[0010] Technical issues This disclosure is designed to address these and other issues.

[0011] This disclosure aims to provide a battery pack with improved safety in the event of a thermal event.

[0012] This disclosure also aims to provide a battery pack capable of suppressing the propagation of heat to adjacent battery modules in the event of a thermal event.

[0013] This disclosure also aims to provide a battery pack with improved cooling efficiency.

[0014] Technical solution In one aspect of this disclosure, a battery pack is provided, comprising: a base plate; a lower battery module located on an upper surface of the base plate; an inner cover including a top covering the upper surface of the lower battery module and having flow paths formed therein; and an upper battery module mounted on the upper surface of the inner cover.

[0015] Additionally, the inner cover may include a side portion that covers one side of the lower battery module and has a flow path communicating with the top.

[0016] Additionally, the side panels can be mounted on the base plate.

[0017] In addition, the base plate can have internal flow paths.

[0018] In addition, the flow path of the base plate and the flow path of the inner cover can be connected to each other.

[0019] Additionally, the battery pack may include a first fastening member configured to attach the inner cover to the upper battery module.

[0020] In addition, the battery pack may also include a first flame-retardant component disposed between the lower battery module and the inner cover.

[0021] In addition, the battery pack may also include a second flame-retardant component disposed between the inner cover and the upper battery module.

[0022] Additionally, the battery pack may include a third flame-retardant component located inside the top.

[0023] Additionally, the battery pack may include sidewalls mounted on the upper surface of the base plate and configured to cover the inner cover and the upper battery module.

[0024] Additionally, the battery pack may include a battery pack cover configured to cover the upper surface of the upper battery module.

[0025] Additionally, the lower battery module may include a module housing having an internal space and vent holes formed on its upper surface; and multiple battery cells arranged inside the module housing.

[0026] In addition, the battery pack may also include a fourth flame-retardant component disposed between the side and the lower battery module.

[0027] In addition, the battery pack may also include a fifth flame-retardant component, disposed inside the side.

[0028] Additionally, the battery pack may include a second fastening member configured to attach the inner cover to the base plate.

[0029] In another aspect of this disclosure, a vehicle including a battery pack according to this disclosure is also provided.

[0030] Beneficial effects According to at least one embodiment of this disclosure, the thermal stability of the battery pack can be improved.

[0031] According to at least one embodiment of this disclosure, heat propagation can be suppressed.

[0032] According to at least one embodiment of this disclosure, the cooling efficiency of the battery pack can be improved. Attached Figure Description

[0033] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, serve to provide a further understanding of the technical features of the present disclosure; therefore, the present disclosure is not to be construed as limited to the drawings.

[0034] Figure 1This is a diagram illustrating a battery pack according to an embodiment of the present disclosure.

[0035] Figure 2 It shows that some parts have been separated. Figure 1 A diagram of the battery pack.

[0036] Figure 3 It is shown Figure 2 A diagram of the battery module.

[0037] Figure 4 It shows that some parts have been separated. Figure 3 A diagram of the battery module.

[0038] Figure 5 This is a diagram illustrating a battery pack with some components separated according to an embodiment of the present disclosure.

[0039] Figure 1 This is a diagram illustrating a battery pack according to an embodiment of the present disclosure.

[0040] Figure 2 It shows that some parts have been separated. Figure 1 A diagram of the battery pack.

[0041] Figure 3 It is shown Figure 2 A diagram of the battery module.

[0042] Figure 4 It shows that some parts have been separated. Figure 3 A diagram of the battery module.

[0043] Figure 5 This is a diagram illustrating a battery pack with some components separated according to an embodiment of the present disclosure.

[0044] Figure 6 It is shown Figure 5 A diagram of the combined structure.

[0045] Figure 7 It is along Figure 6 The cross-sectional view taken by the cutting line A-A'.

[0046] Figure 8 It is along Figure 6 The cross-sectional view taken by the cutting line B-B'.

[0047] Figure 9 It is shown Figure 8 The diagram shows a modified embodiment.

[0048] Figure 10 It is shown Figure 9 A magnified view of part F.

[0049] Figure 11 It is shown Figure 9The diagram shows a modified embodiment.

[0050] Figure 12 It is shown Figure 11 A magnified view of part G.

[0051] Figure 13 It is shown Figure 11 A magnified view of part H.

[0052] Figure 14 This is a diagram illustrating a battery pack with some components separated according to another embodiment of the present disclosure.

[0053] Figure 15 It is shown Figure 14 A diagram of the combined structure.

[0054] Figure 16 It is along Figure 15 The cross-sectional view taken by the cutting line C-C'.

[0055] Figure 17 This is a diagram illustrating a battery pack with some components separated according to yet another embodiment of the present disclosure.

[0056] Figure 18 It is shown Figure 17 A diagram of the combined structure.

[0057] Figure 19 It is along Figure 17 The cross-sectional view taken by the cutting line D-D'. Detailed Implementation

[0058] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Before the description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its general or dictionary meaning, but rather is interpreted based on the meaning and concepts corresponding to the technical aspects of the present disclosure, on the principle of allowing the inventors to appropriately define the terminology for the best interpretation.

[0059] Therefore, the description presented herein is merely a preferred example for illustrative purposes and is not intended to limit the scope of this disclosure. It should be understood that other equivalent substitutions and modifications may be made therein without departing from the scope of this disclosure.

[0060] Figure 1 This is a diagram illustrating a battery pack according to an embodiment of the present disclosure. Figure 2 It shows that some parts have been separated. Figure 1 A diagram of the battery pack.

[0061] Reference Figure 1 and Figure 2 According to embodiments of the present disclosure, a battery pack may include a base plate 110 and a battery module 200.

[0062] The base plate 110 may have a rectangular shape.

[0063] The battery module 200 can be mounted, fixed, coupled, attached, or fastened to the upper surface of the base plate 110. The battery module 200 can be stacked along the vertical direction or the Z-axis direction. Additionally, the battery module 200 can be stacked along the horizontal direction or the Y-axis direction. Furthermore, the battery module 200 can be stacked along the front-back direction or the X-axis direction.

[0064] Multiple battery modules 200 can be configured. These multiple battery modules 200 may include a lower battery module 201 and an upper battery module 202. The upper battery module 202 may be located above the lower battery module 201. The lower battery module 201 may be mounted, fixed, coupled, attached, or fastened to the upper surface of the base plate 110. The structure and configuration of the lower battery module 201 and the upper battery module 202 may be identical. The lower battery module 201 and the upper battery module 202 may be collectively referred to as battery module 200.

[0065] Figure 3 It is shown Figure 2 The diagram shows the battery module 200. Figure 4 It shows that some parts have been separated. Figure 3 The diagram shows the battery module 200.

[0066] Reference Figure 3 and Figure 4 According to embodiments of the present disclosure, the battery module 200 of the battery pack may include a module housing 210, a plurality of battery cells 220, a busbar frame assembly 250, an end cap 230, and a compression pad 240.

[0067] The module housing 210 may have a cuboid shape. The module housing 210 may also be referred to as a frame 210. The module housing 210 may provide internal space. The module housing 210 may have a top surface, a bottom surface, and a pair of side surfaces. Additionally, the module housing 210 may have open shapes on its front and rear surfaces. The module housing 210 may have a vent 211 on its top surface. The vent 211 may connect the interior and exterior of the module housing 210.

[0068] Multiple battery cells 220 can be stacked in the left-right direction or the Y-axis direction. In this case, the battery cell 220 can represent a secondary battery. A secondary battery may include electrode assemblies, electrolyte, electrode leads, and a battery casing. Specifically, the battery cell 220 can be a pouch-type secondary battery. Each battery cell 220 can extend in the front-back direction or the X-axis direction. The electrode leads can protrude towards the front and rear of each battery cell 220.

[0069] Compression pad 240 can be disposed between multiple battery cells 220. Compression pad 240 can be disposed between at least a portion of the battery cells 220 and / or disposed on the outer surface of the laminate.

[0070] Compression pad 240 may contain an elastic material that can absorb the expansion of battery cell 220. For example, compression pad 240 may be made of a foam material such as polyurethane. Alternatively, compression pad 240 may contain a material that can block heat or flame. For example, compression pad 240 may contain an insulating or flame-retardant material, such as silicone or mica.

[0071] The busbar frame assembly 250 can be disposed in front of and behind the plurality of battery cells 220 respectively. The busbar frame assembly 250 can be electrically connected to the electrode leads of the plurality of battery cells 220.

[0072] A pair of end caps 230 can be attached to the front and rear of the module housing 210, respectively. The pair of end caps 230 can cover the front and rear surfaces of the module housing 210. The end caps 230 can be rectangular.

[0073] Figure 5 This is a diagram illustrating a battery pack with some components separated according to an embodiment of the present disclosure. Figure 6 It is shown Figure 5 A diagram of the combined structure. Figure 7 It is along Figure 6 The cross-sectional view taken by the cutting line A-A'. Figure 8 It is along Figure 6 The cross-sectional view taken by the cutting line B-B'.

[0074] Reference Figures 1 to 8 The battery pack according to embodiments of the present disclosure may include an inner cover 400. The inner cover 400 may cover the upper surface of the lower battery module 201. Furthermore, multiple inner covers 400 may be provided. The inner covers 400 may be provided in a one-to-one correspondence with the lower battery module 201. The inner covers 400 may extend along the length direction, X-axis direction, or front-rear direction of the battery module 200.

[0075] The inner cover 400 may include a top 410. The top 410 may have a rectangular plate shape. A flow path 411 may be formed inside the top 410. The flow path 411 of the top 410 may be referred to as the top flow path 411. The top 410 may cover the upper surface of the lower battery module 201.

[0076] The upper battery module 202 can be located on the top 410. In addition, the upper battery module 202 can be mounted, fixed, coupled, attached or fastened to the upper surface of the top 410.

[0077] According to this configuration, the thermal safety of the battery pack can be improved. When a thermal event occurs in the current battery module 201, the inner cover 400 can block or reduce the transfer of heat energy to the upward battery module 202 due to venting, etc. In addition, the top 410 can delay the accumulation of heat energy by having an internal flow path. Therefore, thermal runaway or heat propagation can be suppressed or blocked.

[0078] In addition, when a thermal event occurs, the inner cover 400 can block or reduce the transfer of heat energy from the upper battery module 202 to the lower battery module 201.

[0079] Reference Figures 1 to 8 The inner cover 400 of the battery pack according to an embodiment of the present disclosure may include sides 420 and 430. Sides 420 and 430 may cover the sides of the lower battery module 201. Sides 420 and 430 may extend in the vertical direction or the Z-axis direction. Additionally, sides 420 and 430 may be connected, fastened, coupled, or attached to the top 410. Furthermore, sides 420 and 430 may be configured as a pair. The first side 420 and the second side 430 may be collectively referred to as sides 420 and 430 or a pair of sides 420 and 430. The pair of sides 420 and 430 may be arranged facing each other. The pair of sides 420 and 430 may respectively cover different sides of the battery module 200. The pair of sides 420 and 430 and the top 410 may also be integrally formed.

[0080] Additionally, a pair of side sections 420 and 430 may have internal flow paths 421 and 431. The flow paths 421 and 431 of the pair of side sections 420 and 430 may be referred to as side flow paths 421 and 431.

[0081] According to this configuration, the thermal safety of the battery pack can be improved. When a thermal event occurs in the lower battery module 201, the inner cover 400 can block or reduce the transfer of heat to the adjacent lower battery module 201. In addition, the sides 420 and 430 can delay the accumulation of heat by having side flow paths 421 and 431 inside. Therefore, thermal runaway or heat propagation can be suppressed or blocked.

[0082] Reference Figures 1 to 8 According to embodiments of the present disclosure, the sides 420 and 430 of the battery pack can be mounted, fixed, joined, attached or fastened to the upper surface of the base plate 110.

[0083] According to this configuration disclosed, the thermal safety of the battery pack can be improved by stably installing the inner cover 400.

[0084] Furthermore, this configuration according to the present disclosure can improve the rigidity of the base plate 110 or the battery pack.

[0085] Reference Figures 1 to 8 The battery pack according to embodiments of the present disclosure may include a first fastening member 161. The first fastening member 161 may combine the inner cover 400 and the upper battery module 202. The first fastening member 161 may engage the top 410 with the upper battery module 202. The first fastening member 161 may extend through the top 410.

[0086] According to this configuration disclosed, the thermal safety of the battery pack can be improved by stably installing the inner cover 400.

[0087] Furthermore, this configuration according to the present disclosure can improve the rigidity of the base plate 110 or the battery pack.

[0088] Reference Figures 1 to 8 The battery pack according to embodiments of the present disclosure may include a second fastening member 162. The second fastening member 162 may engage the inner cover 400 with the base plate 110. The second fastening member 162 may engage the sides 420 and 430 with the base plate 110. The second fastening member 162 may penetrate the base plate 110.

[0089] According to this configuration disclosed, the thermal safety of the battery pack can be improved by stably installing the inner cover 400.

[0090] Furthermore, this configuration according to the present disclosure can improve the rigidity of the base plate 110 or the battery pack.

[0091] Reference Figures 1 to 8 The battery pack according to embodiments of the present disclosure may include a third fastening member 163. The third fastening member 163 may connect the lower battery module 201 to the base plate 110. The third fastening member 163 may penetrate the base plate 110.

[0092] Reference Figures 1 to 8 The battery pack according to embodiments of the present disclosure may have a base plate 110 with flow paths formed internally. The flow path 111 of the base plate 110 may be referred to as the bottom flow path 111. In this case, the base plate 110 may also be referred to as a heat sink 110. The bottom flow path 111 may communicate with the flow path of the inner cover 400. The bottom flow path 111 may communicate with the side flow paths 421 and 431. Additionally, the bottom flow path 111 may communicate with the top flow path 411.

[0093] Cooling air or cooling fluid can flow along the bottom flow path 111, side flow paths 421 and 431, and top flow path 411. For example, a portion of the cooling fluid flowing along the bottom flow path 111 can branch and flow into the first side flow path 421. The cooling fluid flowing into the first side flow path 421 can flow along the top flow path 411 and the second side flow path 431, and then converge back into the bottom flow path 111.

[0094] According to this configuration disclosed, the cooling efficiency of the battery pack can be improved.

[0095] Furthermore, this configuration according to the present disclosure can improve thermal safety. When a thermal event occurs in the current battery module 201, the inner cover 400 can block or reduce the transfer of heat to adjacent battery modules 200 by allowing cooling fluid to flow along the bottom flow path 111, the side flow paths 421 and 431, and the top flow path 411. Therefore, thermal runaway or heat propagation can be suppressed or blocked.

[0096] Reference Figures 1 to 8 The battery pack according to embodiments of the present disclosure may include sidewalls 120. Sidewalls 120 may form the exterior of the battery pack. Sidewalls 120 may be mounted, secured, coupled, attached, or fastened to the upper surface of the base plate 110. The battery pack may include four sidewalls 120. The sidewalls 120 and the base plate 110 may form an interior space. Sidewalls 120 may cover at least one of the inner cover 400, the lower battery module 201, and the upper battery module 202.

[0097] Reference Figures 1 to 8 The battery pack according to embodiments of the present disclosure may include a battery pack cover 150. The battery pack cover 150 may form the exterior of the battery pack. The battery pack cover 150 may be mounted, secured, coupled, attached, or fastened to a sidewall 120. The battery pack cover 150 may cover an interior space. The battery pack cover 150 may cover at least one of an inner cover 400, a lower battery module 201, and an upper battery module 202.

[0098] In the following text, features that differ from the foregoing embodiments will be described, and features that are the same as those in the foregoing embodiments will not be described in detail again.

[0099] Figure 9 It is shown Figure 8 The diagram shows a modified embodiment. Figure 10 It is shown Figure 9 A magnified view of part F. (Refer to...) Figure 9 and Figure 10According to an embodiment of the present disclosure, the top 410 of the inner cover 400 of the battery pack may include a third flame-retardant member 503. The third flame-retardant member 503 may comprise a flame-retardant material. Additionally, the third flame-retardant member 503 may comprise an insulating material. Furthermore, the third flame-retardant member 503 may comprise a heat-resistant material. Additionally, the third flame-retardant member 503 may comprise a fire-resistant material. For example, the third flame-retardant member 503 may comprise aerogel, mica, silicone, etc.

[0100] The third flame-retardant member 503 may be disposed inside the top 410. Furthermore, the third flame-retardant member 503 may be disposed in the top flow path 411. Even if the third flame-retardant member 503 is disposed in the top flow path 411, the top flow path 411 may communicate with the first side flow path 421 and the second side flow path 431. The third flame-retardant member 503 may have a pad shape. Furthermore, the third flame-retardant member 503 may extend along the top 410 in the front-back direction or the left-right direction.

[0101] According to this configuration, the thermal safety of the battery pack can be improved. In the event of a thermal event in the current battery module 201, the inner cover 400 may be damaged. Even if the inner cover 400 is damaged, the third flame-retardant member 503 can block or reduce the transfer of heat to the adjacent upper battery module 202. Therefore, thermal runaway or heat propagation can be suppressed or blocked.

[0102] Figure 11 It is shown Figure 9 The diagram shows a modified embodiment. Figure 12 It is shown Figure 11 A magnified view of part G. Figure 13 It is shown Figure 11 A magnified view of part H. (Refer to...) Figures 11 to 13 According to embodiments of the present disclosure, the sides 420 and 430 of the inner cover 400 of the battery pack may include a fifth flame-retardant member 505. The fifth flame-retardant member 505 may be disposed inside the sides 420 and 430. The fifth flame-retardant member 505 may be provided as a pair. Additionally, the fifth flame-retardant member 505 may be disposed in the side flow paths 421 and 431. Even if the fifth flame-retardant member 505 is disposed in the side flow paths 421 and 431, the side flow paths 421 and 431 may communicate with the top flow path 411. The fifth flame-retardant member 505 may have a pad shape. Furthermore, a third flame-retardant member 503 may extend along the sides 420 and 430 in a front-rear direction or a vertical direction.

[0103] According to this configuration, the thermal safety of the battery pack can be improved. In the event of a thermal event in the lower battery module 201, the inner cover 400 may be damaged. Even if the inner cover 400 is damaged, the fifth flame-retardant member 505 can block or reduce the transfer of heat to the adjacent lower battery module 201 or upper battery module 202. Therefore, thermal runaway or heat propagation can be suppressed or blocked.

[0104] Figure 14 This is a diagram illustrating a battery pack with some components separated according to another embodiment of the present disclosure. Figure 15 It is shown Figure 14 A diagram of the combined structure. Figure 16 It is along Figure 15 The cross-sectional view taken by the cutting line C-C'.

[0105] Reference Figures 14 to 16 The battery pack according to embodiments of the present disclosure may include a first flame-retardant member 501. The first flame-retardant member 501 may be disposed between the lower battery module 201 and the inner cover 400. Additionally, the first flame-retardant member 501 may be disposed between the upper surface of the lower battery module 201 and the top 410. Furthermore, the first flame-retardant member 501 may be joined, attached, fixed, or fastened to the lower surface of the top 410. Additionally, the first flame-retardant member 501 may extend along the top 410 in a front-back direction or a left-right direction.

[0106] According to this configuration, the thermal safety of the battery pack can be improved. When a thermal event occurs in the current battery module 201, the first flame-retardant member 501 can prevent damage to the inner cover 400. Furthermore, even if the inner cover 400 is damaged, the first flame-retardant member 501 can block or reduce the transfer of heat to the adjacent upper battery module 202. Therefore, thermal runaway or heat propagation can be suppressed or blocked.

[0107] Reference Figures 14 to 16 The battery pack according to embodiments of the present disclosure may include a second flame-retardant member 502. The second flame-retardant member 502 may be disposed between the upper battery module 202 and the inner cover 400. Additionally, the second flame-retardant member 502 may be disposed between the lower surface of the upper battery module 202 and the top 410. Furthermore, the second flame-retardant member 502 may be coupled, attached, fixed, or fastened to the upper surface of the top 410 or the lower surface of the upper battery module 202. Additionally, the second flame-retardant member 502 may extend along the top 410 in a front-back direction or a left-right direction.

[0108] According to this configuration, the thermal safety of the battery pack can be improved. In the event of a thermal event in the current battery module 201, the inner cover 400 may be damaged. Even if the inner cover 400 is damaged, the second flame-retardant member 502 can block or reduce the transfer of heat to the adjacent upper battery module 202. Therefore, thermal runaway or heat propagation can be suppressed or blocked.

[0109] Figure 17 This is a diagram illustrating a battery pack with some components separated according to yet another embodiment of the present disclosure. Figure 18 It is shown Figure 17 A diagram of the combined structure. Figure 19 It is along Figure 17 The cross-sectional view taken by the cutting line D-D'.

[0110] Reference Figures 17 to 19 The battery pack according to embodiments of the present disclosure may include a fourth flame-retardant member 504. The fourth flame-retardant member 504 may be disposed between the lower battery module 201 and the inner cover 400. Furthermore, the fourth flame-retardant member 504 may be disposed between the lower battery module 201 and sides 420 and 430. The fourth flame-retardant member 504 may be provided as a pair. Furthermore, the fourth flame-retardant member 504 may be coupled, attached, fixed, or fastened to the inner surfaces of the sides 420 and 430. Furthermore, the fourth flame-retardant member 504 may extend along the sides 420 and 430 in a front-rear direction or a vertical direction. The lower battery module 201 may be located between a pair of fourth flame-retardant members 504.

[0111] According to this configuration, the thermal safety of the battery pack can be improved. In the event of a thermal event in the lower battery module 201, the fourth flame-retardant member 504 can prevent damage to the inner cover 400. Furthermore, even if the inner cover 400 is damaged, the fourth flame-retardant member 504 can block or reduce the transfer of heat to the adjacent lower battery module 201 or upper battery module 202. Therefore, thermal runaway or heat propagation can be suppressed or blocked.

[0112] In addition, the battery pack according to this disclosure may also include various components, such as components of a battery pack known at the time of filing of this application, such as a BMS, busbars, relays, current sensors, etc.

[0113] Vehicles according to this disclosure may include the battery pack described above. The battery pack according to this disclosure can be used in vehicles such as electric vehicles or hybrid vehicles. In addition to the battery pack, vehicles according to this disclosure may also include various other components included in the vehicle, such as the vehicle body, electric motors, and control devices such as ECUs (electronic control units).

[0114] The use of terms such as up, down, left, right, front, and back to indicate direction is for ease of description, but it will be apparent to those skilled in the art that these terms may vary depending on the position of the element or the observer.

[0115] This disclosure has been described in detail. However, it should be understood that, in illustrating preferred embodiments of this disclosure, the detailed description and specific examples are given only by way of illustration, as various changes and modifications within the scope of this disclosure will become apparent to those skilled in the art based on this detailed description.

Claims

1. A battery pack, comprising: Base plate; The lower battery module is located on the upper surface of the base plate; The inner cover includes a top that covers the upper surface of the lower battery module and has flow paths formed inside it; as well as The upper battery module is installed on the upper surface of the inner cover.

2. The battery pack according to claim 1, wherein, The inner cover also includes a side portion that covers one side of the lower battery module and has a flow path communicating with the top.

3. The battery pack according to claim 2, wherein, The side portion is mounted on the base plate.

4. The battery pack according to claim 1, wherein, The base plate has flow paths formed inside.

5. The battery pack according to claim 4, wherein, The flow path of the base plate and the flow path of the inner cover are connected to each other.

6. The battery pack of claim 1, further comprising a first fastening member configured to engage the inner cover with the upper battery module.

7. The battery pack according to claim 1 further includes a first flame-retardant component disposed between the lower battery module and the inner cover.

8. The battery pack according to claim 1 further includes a second flame-retardant component disposed between the inner cover and the upper battery module.

9. The battery pack according to claim 1 further includes a third flame-retardant member disposed inside the top.

10. The battery pack of claim 1, further comprising a sidewall mounted on the upper surface of the base plate and configured to cover the inner cover and the upper battery module.

11. The battery pack of claim 1, further comprising a battery pack cover configured to cover the upper surface of the upper battery module.

12. The battery pack according to claim 1, wherein, The lower battery module includes: The module housing has an internal space and vents formed on its upper surface; and Multiple battery cells are arranged inside the module housing.

13. The battery pack according to claim 2 further includes a fourth flame-retardant member disposed between the side portion and the lower battery module.

14. The battery pack according to claim 2 further includes a fifth flame-retardant member disposed inside the side portion.

15. The battery pack of claim 1, further comprising a second fastening member configured to engage the inner cover with the base plate.

16. A vehicle comprising the battery pack according to any one of claims 1 to 15.

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