Battery module

Abstract

A battery module is disclosed. According to one embodiment of the present invention, the battery module may include: a housing providing an internal space and having a top plate; a battery cell located within the housing; a first cover located inside the housing, coupled to a lower surface of the top plate, and having a first separation line; and a second cover located inside the housing, coupled to a lower surface of the first cover, and having a second separation line.

Description

Technical Field

[0001] This disclosure relates to a battery module.

[0002] This application claims priority to Korean Patent Application No. 10-2024-0108814, filed in Korea on August 14, 2024, the disclosure of which is incorporated herein by reference. Background Technology

[0003] With the significant increase in demand for portable electronic products such as smartphones, tablets, and smartwatches, and the growing prevalence of electric vehicles, there has been active research into batteries installed in portable electronic products, especially rechargeable and dischargeable secondary batteries.

[0004] Currently, commercially available rechargeable batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium rechargeable batteries. Among them, lithium rechargeable batteries have a small or no memory effect, so they have received more attention than nickel-based rechargeable batteries because their advantages are that they can be recharged whenever convenient, have 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, wherein a separator is located between the positive and negative electrode plates; and a sealed package or battery casing that houses the electrode assembly together with an electrolyte solution.

[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 included in a metal can and bag-type secondary batteries in which the electrode assembly is included in a bag of aluminum laminates.

[0007] Recently, rechargeable batteries have been widely used in medium and large-sized devices such as electric vehicles and energy storage systems (ESS) for powering and storing energy, as well as in smaller devices such as portable electronic devices. Multiple rechargeable batteries can be electrically connected and stored within a module housing to form a battery module. Each rechargeable battery included in a battery module can then be referred to as a battery cell. Furthermore, multiple battery modules can be connected to each other to form a battery pack.

[0008] However, if a battery pack includes multiple battery modules, and each battery module includes multiple battery cells, as described above, the battery pack may be susceptible to thermal cascading effects between battery modules or battery cells. For example, if an event such as thermal runaway occurs within one battery module, it is necessary to prevent the propagation of thermal runaway to other battery modules or other battery cells. Without proper prevention of thermal runaway propagation between battery modules or battery cells, an event occurring in a particular battery module or battery cell can lead to a cascading thermal reaction in other battery modules or other battery cells, potentially resulting in or escalating an explosion or fire.

[0009] Specifically, if an event such as thermal runaway occurs within a battery module, gases or flames can be randomly emitted to the outside. If this emission is not properly controlled, the gases or flames may be emitted towards another battery module, potentially causing a thermal cascade in that module. In particular, module terminals may be located on the front side of the battery module, and components such as module busbars may be present for electrical connection to another battery module or battery pack. Therefore, if a flame is emitted to the front side of a battery module, the module terminals may be damaged inside the battery pack, leading to an electrical short circuit. Furthermore, since another battery module may be located on the front side of a particular battery module, if a flame is emitted to the front of that module, the emitted flame may be directed to another battery module, potentially causing a fire to spread between battery modules.

[0010] If heat transfer between battery modules or battery cells is not properly controlled, a voltage drop in the battery module or battery pack can occur rapidly. This can cause devices equipped with battery modules or battery packs to shut down suddenly, leading to unexpected damage. For example, if a sudden voltage drop occurs in the battery pack while an electric vehicle is in operation, it may not be possible to ensure sufficient time to move the electric vehicle to a safe location.

[0011] Furthermore, if a fire or explosion suddenly occurs due to the inability to properly control heat transfer between battery modules or battery cells, there is a high probability of causing accidents to users. For example, in the event of thermal runaway in an electric vehicle, if sufficient time is not guaranteed before it develops into a full-blown fire, occupants may not be able to escape safely. Summary of the Invention

[0012] Technical issues

[0013] This disclosure is designed to address the problems of the prior art, and therefore aims to provide a battery module with an improved structure to properly control emissions of flames, etc., generated inside the battery module, as well as a battery pack and a vehicle including the battery module.

[0014] This disclosure also aims to provide a structure that can smoothly discharge exhaust gases generated inside the battery module.

[0015] This disclosure also aims to provide a structure that can prevent externally generated exhaust gases from flowing into the battery module.

[0016] However, the technical problems to be solved by this disclosure are not limited thereto, and those skilled in the art will clearly understand from the following disclosure other problems not mentioned herein.

[0017] Technical solution

[0018] In one aspect of this disclosure, a battery module is provided, the battery module comprising: a housing providing an interior space and having a top plate; a battery cell located within the housing; a first cover located inside the housing, coupled to a lower surface of the top plate, and having a first serration line; and a second cover located inside the housing, coupled to a lower surface of the first cover, and having a second serration line.

[0019] Furthermore, the first and second scribing lines can have different patterns.

[0020] In addition, the first scribe line may include: a main line having a first end and a second end; and a cross line located between the first end and the second end and extending in a direction intersecting the main line.

[0021] In addition, the intersecting lines may include a first intersecting line and a second intersecting line arranged along the length direction of the main line.

[0022] Furthermore, the second scribe line may include a third intersecting line located between the first end and the first intersecting line and extending along the direction intersecting the main line.

[0023] Furthermore, the second scoring line may include a fourth intersecting line located between the first intersecting line and the second intersecting line and extending along the direction intersecting the main line.

[0024] In addition, the first scribe line may also include an auxiliary line extending from the first end in a direction away from the second end.

[0025] In addition, the top plate may have vent holes that expose the first notch line.

[0026] Furthermore, the vent hole can be configured to have a diameter longer than the first notch line.

[0027] Furthermore, the second scribe line can be formed on the portion facing the first scribe line.

[0028] Furthermore, the first serration line can be formed to extend through the first cover.

[0029] Furthermore, the second serration line can be formed to penetrate the second cover.

[0030] In addition, the battery module may also include a first adhesive member disposed between the first cover and the top plate.

[0031] In addition, the first adhesive member may have an exposure hole that communicates with the vent hole and exposes the first score line.

[0032] In addition, the battery module may also include a second adhesive member disposed between the first cover and the second cover.

[0033] According to another aspect of this disclosure, the battery pack includes a battery module according to this disclosure.

[0034] A vehicle according to another aspect of this disclosure includes a battery module according to this disclosure.

[0035] Beneficial effects

[0036] According to at least one embodiment of this disclosure, when gas or flame is generated inside the battery module, the emission of such gas or flame can be appropriately controlled.

[0037] According to at least one embodiment of this disclosure, the electrical safety of the battery module can be improved.

[0038] According to at least one embodiment of this disclosure, heat propagation can be suppressed.

[0039] According to at least one embodiment of this disclosure, the transmission of thermal events caused by flames or gases outside the battery module can be suppressed. Attached Figure Description

[0040] The accompanying drawings illustrate preferred embodiments of the present disclosure and are intended to provide a further understanding of the technical features of the present disclosure together with the foregoing disclosure; therefore, the present disclosure is not to be construed as limited to the drawings.

[0041] Figure 1 This is a diagram illustrating a battery module according to an embodiment of the present disclosure.

[0042] Figure 2 It is shown Figure 1 An exploded view of some components of the battery module.

[0043] Figure 3 It is shown Figure 2 Enlarged views of some components.

[0044] Figure 4 It is shown Figure 1 A magnified view of part C.

[0045] Figure 5 It is shown Figure 3 Enlarged view of the second engraving line on the second cover.

[0046] Figure 6 It is shown Figure 1 The diagram of the second notch line in part C.

[0047] Figure 7 It is along Figure 1 A cross-sectional view taken from line A-A'.

[0048] Figure 8 It is shown Figure 7 The diagram shows a modified embodiment.

[0049] Figure 9 It is along Figure 1 The cross-sectional view taken by line B-B'.

[0050] Figure 10 It is shown Figure 9 The diagram shows a modified embodiment.

[0051] Figure 11 This shows what happens when a thermal event occurs. Figure 7 A graph showing the changes in [the data / process].

[0052] Figure 12 This shows what happens when a thermal event occurs. Figure 1 A graph showing the changes in [the data / process].

[0053] Figure 13 This is a diagram illustrating some components of a battery pack according to an embodiment of the present disclosure.

[0054] Figure 14 This is a diagram illustrating a battery pack according to an embodiment of the present disclosure. Detailed Implementation

[0055] The preferred embodiments of this disclosure will now be described in detail 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 and dictionary meaning, but should be interpreted based on the principle that the inventors are allowed to appropriately define terms for best interpretation, according to the meanings and concepts corresponding to the technical aspects of this disclosure.

[0056] 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 equivalents and modifications may be made thereto without departing from the scope of this disclosure.

[0057] Figure 1This is a diagram illustrating a battery module 200 according to an embodiment of the present disclosure. Figure 2 It is shown Figure 1 An exploded view of some components of the battery module 200. Figure 3 It is shown Figure 2 Enlarged views of some components.

[0058] refer to Figures 1 to 3 The battery module 200 may include a housing 210. The housing 210 may have a cuboid shape. The housing 210 may include a top plate 210a and a lower frame 210b. The housing 210 may provide internal space. The lower frame 210b may have a base plate and a pair of side plates. The top plate 210a may have a rectangular shape. The top plate 210a may be mounted, fastened, connected, fixed, or attached to the pair of side plates. For example, the top plate 210a may be welded to the lower frame 210b. The housing 210 may have an open front and rear side. The top plate 210a may have a vent 211. The vent 211 allows communication between the interior and exterior of the housing 210.

[0059] Battery cell 220 may be located within housing 210. Battery cell 220 may refer to a rechargeable battery. In particular, battery cell 220 may be a pouch-type rechargeable battery. However, the shape of battery cell 220 is not limited to a pouch shape, and battery cell 220 may have various shapes, such as cylindrical or cuboid. Multiple battery cells 220 may be provided. Battery cells 220 may be accommodated inside housing 210.

[0060] The first cover 400 may be located inside the housing 210. The first cover 400 may have a rectangular shape. The first cover 400 may be located below the top plate 210a. The first cover 400 may be attached, fastened, attached, or fixed to the lower surface of the top plate 210a. The first cover 400 may contain a refractory material. The first cover 400 may contain a heat-resistant material. The first cover 400 may contain a flame-retardant material. For example, the first cover 400 may contain a ceramic material. The first cover 400 may contain a fire-resistant material.

[0061] The first cap 400 may include a first notch line 410. The first notch line 410 may be used as a term encompassing and collectively referring to a perforation line 410, a slotted line 410, a cut line 410, a break line 410, a tear line 410, or a separation line 410. The first notch line 410 may be configured to be easily separated by pressure applied to the first cap 400.

[0062] The second cover 300 may be located inside the housing 210. The second cover 300 may have a rectangular shape. The second cover 300 may be located below the first cover 400. The second cover 300 may be joined, fastened, attached, or fixed to the lower surface of the first cover 400. The second cover 300 may contain a refractory material. The second cover 300 may contain a heat-resistant material. The second cover 300 may contain a flame-retardant material. For example, the second cover 300 may contain a ceramic material. The second cover 300 may contain a fire-resistant material. The first cover 400 and the second cover 300 may be made of the same material. The first cover 400 and the second cover 300 may have the same thickness. The first cover 400 and the second cover 300 may have the same dimensions. For example, the thickness of the first cover 400 may be 0.127 mm. For example, the thickness of the second cover 300 may be 0.127 mm.

[0063] The second cover 300 may include a second score line 310. The second score line 310 may be used as a term encompassing and collectively referring to a perforation line 310, a slotted line 310, a cut line 310, a break line 310, a tear line 310, or a separation line 310. The second score line 310 may be configured to be easily separated by pressure applied to the second cover 300.

[0064] When a thermal event occurs from battery cell 220, the vent gas G can be released through the top plate 210a of housing 210. The vent gas G can separate the second scribe line 310. The vent gas G can separate the first scribe line 410. As a result, the vent gas G can be discharged to the outside of battery module 200. At the same time, when battery module 200 is exposed to the vent gas G generated from the outside, the first cover 400 and the second cover 300 can prevent the vent gas G generated from the outside from flowing into battery module 200. As a result, the propagation of thermal events can be suppressed or prevented.

[0065] refer to Figures 1 to 3 The first scribe line 410 and the second scribe line 310 can have different patterns. The first scribe line 410 can be separated more easily than the second scribe line 310. The minimum pressure required to separate the first scribe line 410 can be lower than the minimum pressure required to separate the second scribe line 310.

[0066] If a thermal event occurs at battery cell 220, the high-pressure exhaust gas G can sequentially separate the second notch line 310 and the first notch line 410 and be discharged to the outside of battery module 200. Simultaneously, if battery module 200 is exposed to the exhaust gas G generated from the outside, the second notch line 310 can support the first notch line 410 to prevent separation of the first notch line 410.

[0067] When the battery module 200 is exposed to exhaust gas G generated from the outside, the second score line 310 may remain in place even if the first score line 410 separates. Therefore, the exhaust gas G generated from the outside can be prevented from flowing into the battery module 200.

[0068] refer to Figures 1 to 3 Multiple battery cells 220 can be configured. These multiple battery cells 220 can be stacked along a left-right direction or a Y-axis direction. Each battery cell 220 may include a receiving portion 221 for accommodating electrode assemblies, a first sealing portion 222 protruding forward and backward from the receiving portion 221, and a second sealing portion 223 protruding towards the top of the receiving portion 221. Furthermore, each battery cell 220 may include electrode leads 224 protruding forward and backward from the first sealing portion 222, respectively. Each battery cell 220 may extend along a front-back direction or an X-axis direction. The electrode leads 224 may protrude forward and backward from the receiving portion 221, respectively.

[0069] The pad 250 may be located between multiple battery cells 220. The pad 250 may be located between at least some of the battery cells 220 and / or at the periphery of the stack. For example, the pad 250 may be configured to be located between every four battery cells 220 stacked in the left-right direction.

[0070] The pad 250 may contain an elastic material to absorb the expansion of the battery cell 220. For example, the pad 250 may be made of a foam material such as polyurethane. Alternatively, the pad 250 may contain a material that can block heat or flame. For example, the pad 250 may contain a heat-insulating or fire-retardant material such as silicone or mica.

[0071] The busbar frame assembly 230 can be disposed on the front and rear sides of the plurality of battery cells 220 respectively. The busbar frame assembly 230 can be electrically connected to the electrode leads 224 of the plurality of battery cells 220.

[0072] A pair of end caps 240 can be attached to the front and rear sides of the housing 210, respectively. The pair of end caps 240 can cover the front and rear sides of the housing 210. The end caps 240 can have a rectangular shape. The end caps 240 can form the appearance of the battery module 200.

[0073] The battery module 200 may include power terminals 231 projecting forward toward the housing 210. The power terminals 231 may be disposed on the busbar frame assembly 230. The power terminals 231 may protrude from the busbar assembly 230. The power terminals 231 may be configured as a pair. The power terminals 231 may be exposed to the exterior of the battery module 200.

[0074] refer to Figures 1 to 3The top plate 210a may have vents 211. Multiple vents 211 may be provided. Vents 211 may be elongated along the front-rear direction or the X-axis direction. Vents 211 may expose the first cover 400. Vents 211 may expose first notches 410. Multiple first notches 410 may be provided. Multiple vents 211 may be arranged to correspond one-to-one with multiple first notches 410. Vents 211 may connect the interior of the housing 210 to the exterior.

[0075] If a thermal event occurs in the battery cell 220, the high-pressure exhaust gas G can sequentially separate the second scribe line 310 and the first scribe line 410, and be discharged to the outside of the battery module 200 through the exhaust port 211.

[0076] If the battery module 200 is exposed to exhaust gas G generated from the outside, the second score line 310 may remain intact even if the first score line 410 separates. Therefore, exhaust gas G generated from the outside can be prevented from flowing into the battery module 200 through the exhaust port 211.

[0077] refer to Figures 1 to 3 The first adhesive member 260 may be disposed between the first cover 400 and the top plate 210a. The first adhesive member 260 may have a sheet-like shape. For example, the first adhesive member 260 may be double-sided tape. The first adhesive member 260 may have a rectangular shape. The first adhesive member 260 may have the same dimensions as the top plate 210a. The first adhesive member 260 may have the same dimensions as the first cover 400.

[0078] The first adhesive member 260 may have an exposure hole 261. Multiple exposure holes 261 may be provided. The multiple exposure holes 261 may be arranged to correspond one-to-one with multiple vent holes 211. The multiple exposure holes 261 may be arranged to correspond one-to-one with multiple first score lines 410. The exposure holes 261 can expose the first score lines 410. The exposure holes 261 may have the same shape as the vent holes 211. The exposure holes 261 may have the same size as the vent holes 211. Each first score line 410 can be exposed to the outside of the battery module 200 through the exposure holes 261 and the vent holes 211.

[0079] refer to Figures 1 to 3 The second adhesive member 270 can be disposed between the second cover 300 and the first cover 400. The second adhesive member 270 can have a sheet-like shape. For example, the second adhesive member 270 can be double-sided tape. The second adhesive member 270 can have a rectangular shape. The second adhesive member 270 can have the same dimensions as the top plate 210a. The second adhesive member 270 can have the same dimensions as the first adhesive member 260. The second adhesive member 270 can have the same dimensions as the second cover 300.

[0080] Reference Figures 1 to 3 Multiple second scribing lines 310 can be provided. Multiple second scribing lines 310 can be arranged to correspond one-to-one with multiple first scribing lines 410. Multiple first vent holes 211, multiple exposure holes 261, multiple first scribing lines 410, and multiple second scribing lines 310 can be arranged to correspond one-to-one. First vent holes 211 can face exposure holes 261. First scribing lines 410 can face exposure holes 261. Second scribing lines 310 can face first scribing lines 410.

[0081] Figure 4 It is shown Figure 1 A magnified view of part C.

[0082] refer to Figure 4 The first scribe line 410 may include a main line 401. The main line 401 may include a first end 401a and a second end 401b. The main line 401 may be a straight line connecting the first end 401a and the second end 401b. The main line 401 may extend along the front-back direction or the X-axis direction.

[0083] Cross lines 404 and 405 can be located between the first end 401a and the second end 401b. Cross lines 404 and 405 can extend in the direction of intersecting the main line 401. Cross lines 404 and 405 can extend in the left-right direction or the Y-axis direction.

[0084] The first notch line 410 includes a main line 401 and intersecting lines 404 and 405, thereby increasing the opening area of ​​the first cover 400 when a thermal event occurs.

[0085] Multiple cross lines 404 and 405 can be configured. Cross lines 404 and 405 may include a first cross line 404 and a second cross line 405. The first cross line 404 and the second cross line 405 may be arranged along the front-back direction or the X-axis direction. The first scribe line 410 may have a herringbone shape.

[0086] The first scribe line 410 has multiple intersecting lines 404 and 405, which allows the opening area of ​​the first cover 400 to be enlarged in the event of a thermal event, even if the first vent 211 has an elongated shape in the front-back direction.

[0087] refer to Figure 4 The first notch line 410 may include a first auxiliary line 402 extending from the first end 401a. The first auxiliary line 402 may extend from the first end 401a in a direction away from the second end 401b. The first auxiliary line 402 may extend forward from the first end 401a or along the +X axis direction. The first auxiliary lines 402 may be configured as a pair. The pair of first auxiliary lines 402 may extend to form an angle D. The angle D may be less than 180 degrees.

[0088] The first notch line 410 may include a second auxiliary line 403 extending from the second end 401b. The second auxiliary line 403 may extend from the second end 401b in a direction away from the first end 401a. The second auxiliary line 403 may extend rearward from the second end 401b or along the -X-axis direction. The second auxiliary lines 403 may be configured as a pair. The pair of second auxiliary lines 403 may extend to form an angle D. The angle D may be less than 180 degrees.

[0089] The first notch line 410 includes auxiliary lines 402 and 403, thereby increasing the opening area of ​​the first cover 400 when a thermal event occurs.

[0090] For example, the length L1 of the first notch line 410 in the front-back direction or the X-axis direction can be 133.4 mm. The length L1 from the front end of the first auxiliary line 402 to the rear end of the second auxiliary line 403 can be 133.4 mm. The distance L2 from the front end of the first auxiliary line 402 to the first cross line 404 can be 44.5 mm. The distance L3 from the second cross line 405 to the rear end of the second auxiliary line 403 can be 44.5 mm. The length W1 of the first cross line 404 in the left-right direction or the Y-axis direction can be 19 mm. The first cross line 404 can be composed of two parts. Each of the two parts constituting the first cross line 404 can have a length of 7.5 mm. The two parts constituting the first cross line 404 can have a gap as large as the distance W2. W2 can be 4 mm. The length W1 of the second cross line 405 in the left-right direction or the Y-axis direction can be 19 mm. The second cross line 405 can be composed of two parts. Each of the two parts constituting the second cross line 405 can have a length of 7.5 mm. The two parts that make up the second cross line 405 can have a gap as large as the distance W2. W2 can be 4mm.

[0091] refer to Figure 4 The vent 211 may have a size larger than that of the first scribe line 410. The diameter of the vent 211 in the front-back direction or the X-axis direction may be greater than the length L1 of the first scribe line 410. The diameter of the vent 211 in the left-right direction or the Y-axis direction may be greater than the length W1 of the intersecting lines 404 and 405.

[0092] Figure 5 It is shown Figure 3 Enlarged view of the second etched line 310 on the second cover 300.

[0093] refer to Figure 5The second scribe line 310 may include a third intersecting line 301. The third intersecting line 301 may be located between the first end 401a and the second end 401b. The third intersecting line 301 may extend in a direction intersecting the main line 401. The third intersecting line 301 may extend in a left-right direction or a Y-axis direction.

[0094] The second serration 310 includes a third cross line 301, thereby opening the second cover 300 and facilitating the opening of the first cover 400 in the event of a thermal event. Furthermore, the second serration 310 supports the first serration 410, thereby preventing the first serration 410 from being opened by external gases.

[0095] The second scribe line 310 may include a fourth intersecting line 302. The second scribe line 310 may include a fifth intersecting line 303. The third intersecting line 301, the fourth intersecting line 302, and the fifth intersecting line 303 may be arranged along the front-back direction or the X-axis direction.

[0096] The second etched line 310 includes multiple intersecting lines 301, 302, 303, such that even if the first vent 211 has an elongated shape in the front-rear direction, the second cover 300 can be opened and the first cover 400 can be easily opened in the event of a thermal event.

[0097] The length W4 of the third intersecting line 301 in the left-right direction or the Y-axis direction can be 19 mm. The third intersecting line 301 can consist of two parts. Each of the two parts constituting the third intersecting line 301 can have a length of 7.5 mm. The two parts constituting the third intersecting line 301 can have a gap as large as the distance W5. W5 can be 4 mm.

[0098] The length W4 of the fourth intersecting line 302 in the left-right direction or the Y-axis direction can be 19 mm. The fourth intersecting line 302 can consist of two parts. Each of the two parts constituting the fourth intersecting line 302 can have a length of 7.5 mm. The two parts constituting the fourth intersecting line 302 can have a gap as large as the distance W5. W5 can be 4 mm.

[0099] The length W4 of the fifth intersecting line 303 in the left-right direction or the Y-axis direction can be 19 mm. The fifth intersecting line 303 can consist of two parts. Each of the two parts constituting the fifth intersecting line 303 can have a length of 7.5 mm. The two parts constituting the fifth intersecting line 303 can have a gap as large as the distance W5. W5 can be 4 mm.

[0100] Figure 6 It is shown Figure 1 The second notch line 310 in part C is shown in the figure.

[0101] refer to Figure 6The second scribe line 310 is indicated by a dashed line to show the relative position of the first scribe line 410 and the second scribe line 310. (See reference) Figures 4 to 6 The third cross line 301 can be located between the first end 401a and the first cross line 404. For example, the distance L4 between the front end of the first auxiliary line 402 and the third cross line 301 can be 23mm. Since the third cross line 301 is located between the first end 401a and the first cross line 404, the second scribe line 310 can stably support the first scribe line 410.

[0102] refer to Figures 4 to 6 The fourth cross line 302 can be located between the first cross line 404 and the second cross line 405. The fourth cross line 302 can be located at the center of the length L1 of the first notch line 410. For example, the distance L6 between the front end of the first auxiliary line 402 and the fourth cross line 302 can be 66.7 mm.

[0103] refer to Figures 4 to 6 The fifth cross line 303 can be located between the second end 401b and the second cross line 405. For example, the distance L5 between the rear end of the second auxiliary line 403 and the fifth cross line 303 can be 23mm. Since the fifth cross line 303 is located between the second end 401b and the second cross line 405, the second scribe line 310 can stably support the first scribe line 410.

[0104] Figure 7 It is along Figure 1 A cross-sectional view taken from line A-A'.

[0105] refer to Figure 7 The first notch line 410 can be formed to penetrate the first cover 400. Therefore, the first notch line 410 can be separated more easily.

[0106] Figure 8 It is shown Figure 7 The diagram shows a modified embodiment.

[0107] refer to Figure 8 The first notch 410 may not penetrate the first cover 400. For example, the first notch 410 may be formed to a depth of approximately half the thickness of the first cover 400. Separation Figure 8 The minimum pressure required for the first notch line 410 in the embodiment can be higher than that required for separation. Figure 7 The minimum pressure required for the first notch line 410 in the embodiment.

[0108] Figure 9 It is along Figure 1 The cross-sectional view taken by line B-B'.

[0109] refer to Figure 9The second score line 310 can be formed to penetrate the second cover 300. Therefore, the second score line 310 can be separated more easily.

[0110] Figure 10 It is shown Figure 9 The diagram shows a modified embodiment.

[0111] refer to Figure 10 The second notch 310 may not penetrate the second cover 300. For example, the second notch 310 may be formed to a depth of approximately half the thickness of the second cover 300. Separation Figure 10 The minimum pressure required for the second notch line 310 in the embodiment can be higher than that for separation. Figure 9 The minimum pressure required for the second notch line 310 in the embodiment.

[0112] Figure 11 This shows what happens when a thermal event occurs. Figure 7 A graph showing the changes in [the data / process].

[0113] refer to Figure 11 When a thermal event occurs in battery cell 220, the vent gas G can be released through the second seal 223. The vent gas G can apply pressure to the second cover 300 to open the second notch 310. If the second notch 310 is open, the vent gas G can apply pressure to the first cover 400 to open the first notch 410. If the first notch 410 is open, the vent gas G can be released to the outside of battery module 200 through vent 211.

[0114] Figure 12 This shows what happens when a thermal event occurs. Figure 1 A graph showing the changes in [the data / process].

[0115] refer to Figure 12 When a thermal event occurs, the exhaust gas G can be discharged through a specific vent 211a. At this time, the first notch 410 facing the remaining vent 211b can remain closed. Therefore, the exhaust gas G can be prevented from flowing into the battery module 200 through the remaining vent 211b.

[0116] Figure 13 This is a diagram showing some components of a battery pack 1000 according to an embodiment of the present disclosure. Figure 14 This is a diagram illustrating a battery pack 1000 according to an embodiment of the present disclosure.

[0117] Reference Figure 13 and Figure 14 The battery pack 1000 according to embodiments of the present disclosure may include the battery module 200 of the present disclosure. The battery pack 1000 may include a plurality of battery modules 200.

[0118] The battery pack housing 100 may include a base frame 110. The base frame 110 may have a rectangular shape. The base frame 110 may have a flat shape. The base frame 110 may form the appearance of the battery pack 1000. The base frame 110 may provide internal space for the battery pack 1000.

[0119] The battery pack housing 100 may include sidewalls 120. Sidewalls 120 may be mounted, fastened, connected, secured, or attached to the upper surface of the base frame 110. Sidewalls 120 may consist of four pieces. Sidewalls 120 may be arranged along the perimeter of the base frame 110. Sidewalls 120 may shape the appearance of the battery pack 1000. Sidewalls 120 may provide internal space.

[0120] The battery pack housing 100 may include a battery pack cover 150. The battery pack cover 150 may have a rectangular frame shape.

[0121] The battery pack cover 150 can be installed, fastened, connected, secured, or attached to the side wall 120. The battery pack cover 150 can cover the internal space of the battery pack 1000.

[0122] The battery pack 1000 may include partition walls 600. Partition walls 600 may include a first partition wall 610 and a second partition wall 620. Multiple partition walls 600 may be provided. Partition walls 600 may be mounted, fastened, fixed, connected, or attached to the upper surface of the base frame 110. Partition walls 600 may divide the internal space of the battery pack 1000. Battery modules 200 may be located within the spaces divided by partition walls 600.

[0123] The battery pack 1000 may include a venting device 500. The venting device 500 may be mounted on a side wall 120. For example, the venting device 500 may be mounted on the front side wall 120. For example, the venting device 500 may be a valve. When the pressure inside the battery pack housing 100 increases, the venting device 500 may open to release gas. Furthermore, the venting device 500 may prevent outside air from flowing into the battery pack housing 100. Multiple venting devices 500 may be provided.

[0124] In addition, the battery pack 1000 according to this disclosure may also include various components other than the battery module 200, such as various components of the battery pack 1000 known at the time of filing of this application, such as BMS, busbar, relay, current sensor, etc.

[0125] Additionally, components such as a BMS, busbars, relays, and current sensors may be included as components of the battery module 200 according to this disclosure. In this case, components such as a BMS, busbars, relays, and current sensors may be provided inside the housing 210. In this case, the battery module may also be referred to as a battery pack.

[0126] The battery module 200 according to this disclosure can be applied to vehicles such as electric vehicles or hybrid electric vehicles. That is, a vehicle according to this disclosure may include the battery module 200 according to this disclosure or a battery pack according to this disclosure. Furthermore, in addition to the battery module or battery pack, a vehicle according to this disclosure may also include various other components included in the vehicle. For example, in addition to the battery module 200 according to this disclosure, a vehicle according to this disclosure may also include a body, a motor, and control devices such as an ECU (electronic control unit).

[0127] This disclosure has been described in detail. However, it should be understood that while the detailed description and specific examples indicate preferred embodiments of this disclosure, they are given by way of illustration only, as various changes and modifications within the scope of this disclosure will become apparent to those skilled in the art from the detailed description.

Claims

1.A battery module comprising: a case that provides a space inside and has a top plate; a battery cell located inside the case; a first cover located inside the case, coupled to a lower surface of the top plate, and having a first score line; and a second cover located inside the case, coupled to a lower surface of the first cover, and having a second score line. 2.The battery module of claim 1, the first score line and the second score line have different patterns. wherein 3.The battery module of claim 1, the first score line includes: wherein a main line having a first end and a second end; and a cross line located between the first end and the second end and extending in a direction crossing the main line. 4.The battery module of claim 3, the cross line includes a first cross line and a second cross line arranged along a length direction of the main line. wherein 5.The battery module of claim 4, the second score line includes a third cross line located between the first end and the first cross line and extending in the direction crossing the main line. wherein 6.The battery module of claim 4, the second score line includes a fourth cross line located between the first cross line and the second cross line and extending in the direction crossing the main line. wherein 7.The battery module of claim 3, the first score line further includes an auxiliary line extending from the first end in a direction away from the second end. wherein 8.The battery module of claim 1, the top plate has a vent hole exposing the first score line. wherein, 9.The battery module of claim 8, the vent hole is configured to have a diameter longer than the first score line. wherein 10.The battery module of claim 1, the second score line is formed at a portion facing the first score line. wherein, 11.The battery module of claim 1, the first score line is formed to penetrate through the first cover. wherein 12.The battery module of claim 1, the second score line is formed to penetrate through the second cover. wherein 13.The battery module of claim 1, further comprising: a first adhesive member arranged between the first cover and the top plate. 14.The battery module of claim 13, the first adhesive member has an exposed hole communicating with the vent hole and exposing the first score line. wherein 15.The battery module of claim 1, further comprising: a second adhesive member arranged between the first cover and the second cover. 16.A battery pack comprising the battery module according to any one of claims 1 to 15. 17.A vehicle comprising the battery module according to any one of claims 1 to 15. ​

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