Battery pack and vehicle including same

Abstract

A battery pack according to the present invention comprises: at least one battery assembly having a plurality of battery cells; and a pack case having an accommodation space in which the battery assembly is accommodated, and having a pack lead covering the accommodation space, wherein the pack lead has a spacer which is disposed between the battery assembly and the pack lead and spaces the battery assembly and the pack lead apart from each other.

Description

Battery pack and vehicle including same

[0001] The present invention relates to a battery pack and a vehicle including the same, and more particularly, to a battery pack having an improved structure so as to appropriately control the emission of flames and the like generated inside a battery assembly, and a vehicle including the same.

[0002] This application claims priority to Korean Patent Application No. 10-2024-0101817, filed July 31, 2024, and Korean Patent Application No. 10-2024-0123076, filed September 10, 2024, the entire contents of which are incorporated herein by reference.

[0003] As demand for portable electronic devices such as smartphones, tablet PCs, and smartwatches increases significantly and electric vehicles become increasingly widespread, research is actively being conducted on the batteries used in these devices, especially secondary batteries that can be repeatedly charged and discharged.

[0004] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based secondary batteries.

[0005] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. Lithium secondary batteries comprise an electrode assembly comprising positive and negative plates coated with the positive and negative electrode active materials, respectively, with a separator interposed between them, and an outer case, i.e., a battery case, that seals and encloses the electrode assembly together with an electrolyte.

[0006] In general, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is built into a metal can and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0007] Recently, secondary batteries are widely used for power and energy storage not only in small devices such as portable electronic devices but also in medium- to large-sized devices such as electric vehicles and energy storage systems (ESS). Multiple secondary batteries can be electrically connected and housed within a module case to form a single battery module. Each secondary battery within a battery module can be referred to as a battery cell. Furthermore, multiple such battery modules can be connected to form a single battery pack.

[0008] However, when a battery pack contains multiple battery modules, each of which contains multiple battery cells, it may be vulnerable to a thermal chain reaction between battery modules or between battery cells. For example, if an event such as thermal runaway occurs within a single battery module, the propagation of this thermal runaway to other battery modules or cells must be prevented. If the propagation of thermal runaway between battery modules or cells is not properly prevented, an event occurring in a specific battery module or battery cell may trigger a chain reaction of thermal reactions in other battery modules or cells, potentially causing an explosion or fire, or potentially increasing its scale.

[0009] In particular, if an event such as thermal runaway occurs in a single battery module, gas or flames may be randomly discharged to the outside. If the discharge of gas or flames is not properly controlled, there is a risk that the gas or flames may be discharged toward other battery modules, causing a thermal chain reaction in the other battery modules. In particular, the front side of the battery module may have module terminals, which may be configured to electrically connect to other battery modules or battery packs, such as module bus bars. Therefore, if flames are discharged toward the front side of such a battery module, the module terminals may be damaged within the battery pack, causing an electrical short. Furthermore, since other battery modules may be present at the front side of the battery module, if flames are discharged toward the front side of a specific battery module, the discharged flames may easily spread to other battery modules, potentially causing a fire to spread between battery modules.

[0010] Failure to properly control thermal transfer between battery modules or battery cells can lead to a sudden voltage drop in the battery module or battery pack. This can lead to a sudden shutdown of the device equipped with the battery module or battery pack, resulting in unexpected damage. For example, if a voltage drop in a battery pack occurs suddenly while an electric vehicle is in operation, there is no time to move the vehicle to a safe location.

[0011] Moreover, if thermal propagation between battery modules or cells fails to be properly controlled, resulting in a sudden fire or explosion, there is a high possibility of causing casualties. For example, if thermal runaway occurs in an electric vehicle, if a certain amount of time is not allowed for a full-blown fire to develop, occupants may not be able to escape safely.

[0012] The present invention was created in consideration of the above-described problems, and its primary purpose is to provide a battery pack having an improved structure so as to appropriately control the emission of flames and the like generated inside a battery assembly, and an automobile including the same.

[0013] In addition, another object of the present invention is to provide a battery pack and a vehicle including the same, wherein a space between the battery assembly and the pack lead can be secured when a thermal event occurs.

[0014] In addition, another object of the present invention is to provide a battery pack and a vehicle including the same that can smoothly secure a venting space when a thermal event occurs.

[0015] In addition, another object of the present invention is to provide a battery pack capable of guiding the flow of venting gas when a thermal event occurs, and a vehicle including the same.

[0016] In addition, another object of the present invention is to provide a battery pack with improved manufacturability and a vehicle including the same.

[0017] The technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention described below.

[0018] A battery pack according to the present invention comprises: at least one battery assembly having a plurality of battery cells; and a pack case having a receiving space in which the battery assembly is received and a pack lead covering the receiving space; wherein the pack lead has a spacer disposed between the battery assembly and the pack lead and spaced apart from the battery assembly and the pack lead.

[0019] The above spacer can form a venting space by spacing out the battery assembly and the pack lead.

[0020] The battery assembly further includes a top plate that covers the plurality of battery cells and is disposed on the pack lead side, and the spacer is disposed between the top plate and the pack lead and can space the top plate and the pack lead apart.

[0021] The above battery assembly may have at least one venting hole provided on the spacer side.

[0022] The above spacer may be provided on the inner surface of the pack lead.

[0023] The pack lid is provided to cover the upper portion of the receiving space, and the spacer may be provided on the lower surface of the pack lid.

[0024] The above spacer can be formed integrally with the pack lead.

[0025] The spacer may be formed in a forming shape in which at least a portion of the pack lead protrudes toward the battery assembly.

[0026] The above spacer may include a material having heat resistance.

[0027] The above spacer may be positioned to pressurize the battery assembly.

[0028] In the above battery assembly, the plurality of battery cells are stacked and arranged, and the spacers are provided in a plurality and can be arranged in a direction parallel to the stacking direction of the plurality of battery cells.

[0029] The above pack case may further include a venting device that connects the receiving space and the outside with each other.

[0030] The above spacer may be positioned at an end of the battery assembly and may include an elastic pad member.

[0031] A battery pack according to the present invention may be formed such that, in the battery assembly, the plurality of battery cells are stacked and arranged, and the spacer extends in a direction parallel to the stacking direction of the plurality of battery cells.

[0032] The spacer may be provided as a spacer bracket having a coupling portion coupled to the pack lead and a protrusion protruding toward the battery assembly.

[0033] The spacer is provided in a plurality, and at least some of the plurality of spacers can be placed at at least some of each corner of the battery assembly.

[0034] A vehicle according to the present invention comprises at least one battery pack according to the present invention.

[0035] According to the present invention, a battery pack having an improved structure and a vehicle including the same can be provided so as to appropriately control the emission of flames and the like generated inside a battery assembly by a pack lead having a spacer.

[0036] In addition, a battery pack and a vehicle including the same can be provided, in which a space between a battery assembly and a pack cover can be secured when a thermal event occurs by a pack lead having a spacer.

[0037] In addition, a battery pack and a vehicle including the same can be provided, which can secure a venting space when a thermal event occurs by a pack lead having a spacer.

[0038] In addition, a battery pack and a vehicle including the same can be provided, which can guide the flow of venting gas when a thermal event occurs by a pack lead having a spacer.

[0039] In addition, a spacer is provided in the form of a bracket, so that a battery pack and a vehicle including the same with improved manufacturability can be provided.

[0040] The effects of the present invention are not limited to the effects described above, and effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention pertains from this specification and the attached drawings.

[0041] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0042] FIG. 1 is a perspective view showing the overall appearance of a battery pack according to one embodiment of the present invention.

[0043] Figure 2 is a perspective view showing the pack lead in Figure 1 disassembled.

[0044] Figure 3 is a perspective view showing a pack lead according to one embodiment of the present invention as viewed from below.

[0045] Fig. 4 is a cross-sectional perspective view showing the AA' section of Fig. 1.

[0046] Figure 5 is a side cross-sectional view showing the BB' section of Figure 1 and the flow of venting gas.

[0047] Figure 6 is a cross-sectional side view showing the pack lead swelling when a thermal event occurs in Figure 5.

[0048] FIG. 7 is a perspective view showing the flow of venting gas with the pack lead removed from the battery pack according to one embodiment of the present invention.

[0049] Figure 8 is a perspective view showing the overall appearance of a battery assembly according to one embodiment of the present invention.

[0050] Figure 9 is a perspective view showing the battery assembly of Figure 8 in an exploded view.

[0051] Fig. 10 is an enlarged perspective view of the battery cell of Fig. 9.

[0052] FIG. 11 is a perspective view showing a spacer with a pad member further arranged in a pack lead according to one embodiment of the present invention, viewed from below.

[0053] Fig. 12 is a perspective view showing a pack lead viewed from below according to a modified example of one embodiment of the present invention.

[0054] Fig. 13 is a perspective view showing a pack lead viewed from below according to another embodiment of the present invention.

[0055] Figure 14 is a perspective view showing the separation bracket in Figure 13, separated and enlarged.

[0056] Fig. 15 is a perspective view showing a pack lead viewed from below according to a modified example of another embodiment of the present invention.

[0057] Figure 16 is a perspective view showing the separation bracket in Figure 15, separated and enlarged.

[0058] FIG. 17 is a perspective view showing a pack lead viewed from below according to another modified example of another embodiment of the present invention.

[0059] Figure 18 is a perspective view showing the separation bracket in Figure 17, separated and enlarged.

[0060] Fig. 19 is a drawing showing a vehicle according to one embodiment of the present invention.

[0061] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0062] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0063] Furthermore, the present invention includes various embodiments. For each embodiment, redundant descriptions of substantially identical or similar components will be omitted, and the differences will be described.

[0064] FIG. 1 is a perspective view showing the overall appearance of a battery pack according to one embodiment of the present invention, FIG. 2 is a perspective view showing an exploded view of the pack lead in FIG. 1, FIG. 3 is a perspective view showing a pack lead according to one embodiment of the present invention as seen from below, FIG. 4 is a cross-sectional perspective view showing the AA' cross-section of FIG. 1, and FIG. 5 is a side cross-sectional view showing the BB' cross-section of FIG. 1 and the flow of venting gas.

[0065] Hereinafter, a battery pack (10) according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5. A battery pack (10) according to an embodiment of the present invention may include at least one battery assembly (100) and a pack case (200).

[0066] The battery assembly (100) may include a plurality of battery cells (110). The battery cells (110) may be secondary batteries. The battery cells (110) may be, for example, pouch-shaped battery cells (110). However, the battery cells (110) are not limited thereto, and may also be provided as cylindrical or square battery cells (110).

[0067] In the battery assembly (100), a plurality of battery cells (110) may be stacked and arranged. The plurality of battery cells (110) may be stacked, for example, along the X direction.

[0068] A receiving space (S) may be formed in the pack case (200). At least one battery assembly (100) may be received in the receiving space (S). A plurality of battery assemblies (100) may be received in the receiving space (S).

[0069] The pack case (200) may be provided with a pack lid (210). The pack lid (210) may cover a receiving space (S). The pack lid (210) may cover at least one battery assembly (100). The pack lid (210) may cover a plurality of battery assemblies (100).

[0070] The pack lead (210) may include a spacer (300). The spacer (300) may be placed between the battery assembly (100) and the pack lead (210). The spacer (300) may space the battery assembly (100) and the pack lead (210).

[0071] A plurality of spacers (300) may be provided. The spacers (300) may be provided corresponding to each of a plurality of battery assemblies (100). A plurality of spacers (300) may be provided for one battery assembly (100). For example, FIG. 3 illustrates an area 'A' corresponding to a battery assembly (100), and four spacers (300) may be provided in the area 'A'. The number and positions of the spacers (300) are not limited to FIG. 3. (Hereinafter, the area 'A' illustrated in other drawings should also be understood as a portion of the pack lead (210) corresponding to the battery assembly (100), similarly to the above.)

[0072] The spacer (300) may be provided on the pack lead (210) and may be provided so as to protrude from the pack lead (210) toward the battery assembly (100). The distance between the pack lead (210) and the battery assembly (100) may be proportional to the protruding length of the spacer (300). The distance between the pack lead (210) and the battery assembly (100) may be approximately similar to the protruding length of the spacer (300).

[0073] In conventional battery packs, when a thermal event, such as thermal runaway, occurs in a specific battery cell, the pack case can become thermally deformed or melted due to the high temperatures. This narrows the gap between the battery assembly and the pack lead, making it difficult for flames generated within the battery assembly to be properly dissipated. As a result, flames cannot be completely dissipated to the outside and can flow into adjacent battery cells or battery assemblies, accelerating thermal runaway and heat transfer.

[0074] However, the battery pack (10) according to the present invention has a pack lead (210) equipped with a spacer (300), so that even when a thermal event occurs in the battery pack (10), the gap between the battery assembly (100) and the pack lead (210) can be maintained by the spacer (300). As a result, the battery pack (10) according to the present invention can have a structure improved so as to appropriately control the discharge of flames, etc. generated inside the battery assembly (100).

[0075]

[0076] Meanwhile, the pack case (200) may have a bottom portion (230) and a side wall portion (220). The bottom portion (230) may form the bottom of the pack case (200). The side wall portion (220) may surround the bottom portion (230). By the bottom portion (230) and the side wall portion (220), an accommodation space (S) may be formed inside the pack case (200). The pack case (200) may further have a partition frame (240). The partition frame (240) may be arranged across the accommodation space (S) and may partition the accommodation space (S). Meanwhile, the pack case (200) may further have a venting device (400), and a detailed description of the venting device (400) will be described later.

[0077]

[0078] The spacer (300) can form a venting space (VS) by spacing the battery assembly (100) and the pack lead (210). When a thermal event occurs in any battery cell (110) of the battery assembly (100), high-temperature flames, gases, and solid discharges (hereinafter collectively referred to as "venting gas (VG)") can be discharged from the battery cell (110). The venting space (VS) can be understood as a space in which such venting gas (VG) flows.

[0079] In the case of conventional battery packs, there was a problem that the pack case could be thermally deformed or melted by high-temperature venting gas, and the venting space could become narrow or blocked when a thermal event occurred.

[0080] However, the battery pack (10) according to the present invention has the advantage that a venting space (VS) through which venting gas (VG) can flow can be smoothly formed by the spacer (300), and even when a thermal event occurs, the venting space (VS) can be maintained without narrowing by the spacer (300), so that the venting gas (VG) can be smoothly discharged. As a result, the venting gas (VG) can be completely discharged to the outside, and can be prevented from flowing into an adjacent battery cell (110) or battery assembly (100), thereby preventing thermal runaway and acceleration of thermal transfer phenomena.

[0081]

[0082] The battery assembly (100) may further include a top plate (130). The top plate (130) may cover a plurality of battery cells (110) in the battery assembly (100). The top plate (130) may be disposed on the pack lead (210) side of the battery assembly (100). That is, the top plate (130) may be disposed at a position adjacent to the pack lead (210) in the battery assembly (100). The top plate (130) may be disposed, for example, on the upper side or the +Z direction side of the battery assembly (100).

[0083] The spacer (300) can space the top plate (130) and the pack lead (210). By the spacer (300), a venting space (VS) can be formed between the top plate (130) and the pack lead (210).

[0084] When the battery pack (10) is configured as described above, a space can be formed between the top plate (130) covering the plurality of battery cells (110) of the battery assembly (100) and the pack lead (210), which is separated by a spacer (300), so that the plurality of battery cells (110) and the pack lead (210) can be more securely separated.

[0085]

[0086] The battery assembly (100) may have at least one venting hole (VH). The venting hole (VH) may be a hole through which venting gas (VG) may pass. The venting hole (VH) may be arranged on the spacer (300) side of the battery assembly (100). A plurality of venting holes (VH) may be provided. The venting hole (VH) may be provided in the top plate (130). The venting hole (VH) may be in communication with the space between the battery assembly (100) and the pack lid (210) separated by the spacer (300). The venting hole (VH) may be in communication with the venting space (VS).

[0087] When the battery assembly (100) is provided with a venting hole (VH) as described above, the venting gas (VG) can be discharged into the space formed between the battery assembly (100) and the pack lid (210), or the venting space (VS), through the venting hole (VH). Therefore, when a thermal event occurs, the venting gas (VG) generated from the battery cell (110) can be discharged more smoothly.

[0088]

[0089] Meanwhile, when a plurality of venting holes (VH) are provided, the plurality of venting holes (VH) may be spaced apart from each other. A spacer (300) may be placed between the venting holes (VH) that are spaced apart from each other. The spacer (300) may be placed so as not to interfere with the venting holes (VH). For example, when viewed from the direction toward the battery assembly (100) from the pack lid (210), the spacer (300) may be placed at a position that does not overlap with the venting holes (VH).

[0090]

[0091] The spacer (300) may be provided on the inner side of the pack lead (210). Here, the inner side may be understood as a portion of the pack lead (210) facing the battery assembly (100) or a portion facing the battery assembly (100).

[0092] In this way, when the spacer (300) is provided on the inner surface of the pack lead (210), the inner surface of the pack lead (210) and the battery assembly (100) can be spaced apart, which has the advantage that the pack lead (210) and the battery assembly (100) can be spaced apart more securely.

[0093]

[0094] The pack lid (210) may be provided to cover the upper portion of the receiving space (S). The pack lid (210) may be provided to cover, for example, a +Z-direction side portion of the receiving space (S). In this case, the pack lid (210) may cover the upper portion of the battery assembly (100). The spacer (300) may be provided on the lower surface of the pack lid (210). For example, the spacer (300) may be provided on the -Z-direction side portion of the pack lid (210). The spacer (300) may be arranged on the lower surface of the pack lid (210) so as to face the battery assembly (100). The spacer (300) may protrude downward or in the -Z-direction from the lower surface of the pack lid (210) toward the battery assembly (100).

[0095] When configured as described above, the battery assembly (100) and the pack lead (210) can be spaced apart from each other on the upper side of the battery assembly (100), and a venting space (VS) can be formed between the upper side of the battery assembly (100) and the lower side of the pack lead (210). Therefore, so-called upper venting can be effectively implemented.

[0096]

[0097] The spacer (300) may be formed integrally with the pack lead (210). The spacer (300) may protrude from the pack lead (210) in a direction toward the battery assembly (100), and may be formed integrally with the pack lead (210). In this case, the spacer (300) and the pack lead (210) may be manufactured at once.

[0098] In this way, when the spacer (300) is formed integrally with the pack lead (210), the manufacturability of the spacer (300) and the pack lead (210) can be improved, and the spacer (300) can be more firmly fixed to the pack lead (210).

[0099]

[0100] The spacer (300) may be formed in a forming shape. Specifically, the spacer (300) may be formed such that at least a portion of the pack lead (210) protrudes toward the battery assembly (100). In addition, a portion of the spacer (300) on the opposite side of the battery assembly (100) may have a recessed shape from the pack lead (210).

[0101] In this way, when the spacer (300) is formed in a forming form, since the spacer (300) and the pack lead (210) can be manufactured by pressing a single thin plate-shaped member, the manufacturability of the spacer (300) and the pack lead (210) can be further improved, and the weight of the pack lead (210) can be reduced.

[0102]

[0103] The spacer (300) may include a heat-resistant material. For example, the spacer (300) may include a metal material that is resistant to high temperatures. For example, the spacer (300) may include a SUS material. The spacer (300) may be composed of the same material as the pack lid (210).

[0104] In this way, when the spacer (300) includes a material having heat resistance, deformation of the spacer (300) due to high temperature can be effectively prevented.

[0105]

[0106] The spacer (300) can be positioned to pressurize the battery assembly (100). The spacer (300) can pressurize the battery assembly (100) while in direct contact with the battery assembly (100).

[0107] When the spacer (300) is positioned as described above, the spacer (300) can be closely attached to the battery assembly (100), thereby reducing the assembly tolerance of the battery pack (10). In addition, even when external impact or vibration is applied, the pack lead (210) can be maintained more firmly.

[0108]

[0109] In the battery assembly (100), a plurality of battery cells (110) may be arranged in a stacked manner. For example, the plurality of battery cells (110) may be arranged in a stacked manner along the X-axis direction. A plurality of spacers (300) may be provided. The plurality of spacers (300) may be arranged in a direction parallel to the stacking direction of the plurality of battery cells (110). That is, the plurality of spacers (300) may form a row in the stacking direction of the battery cells (110). Along the row direction of the plurality of spacers (300), two adjacent spacers (300) may be spaced apart from each other. For example, as illustrated in area 'A' of FIG. 3, in one battery assembly (100), two spacers (300) may be arranged in a row in a spaced manner along the X-direction.

[0110] When a plurality of spacers (300) are arranged as described above, there is an advantage in that the space between the pack lead (210) and the battery assembly (100), or the venting space (VS), can be expanded. In addition, since the plurality of spacers (300) form a row, there is also an advantage in that the venting gas (VG) discharged from the battery cell (110) can be guided in the row direction of the plurality of spacers (300).

[0111]

[0112] Meanwhile, the battery assembly (100) may further include at least one bulkhead member (170). The bulkhead member (170) may be placed on the outside of the stacked battery cells (110) or may be placed between the stacked battery cells (110).

[0113] The bulkhead member (170) may be provided, for example, for every four battery cells (110).

[0114] The bulkhead member (170) may be provided, for example, to have a function of absorbing swelling of the battery cell (110).

[0115] The bulkhead member (170) may be provided with a function of blocking, for example, high temperature heat or flames.

[0116] The bulkhead member (170) may be provided, for example, to have the function of cooling the battery cell (110).

[0117] The bulkhead member (170) may have functions other than those listed above. The bulkhead member (170) may have different functions simultaneously.

[0118] When a plurality of bulkhead members (170) are provided, one bulkhead member (170) and another bulkhead member (170) may have different functions. For example, the outermost part of the stacked battery assembly (100) may be provided with a function of absorbing swelling of the battery cells (110), and the bulkhead members (170) arranged between the battery cells (110) may have a function of cooling the battery cells (110) or a function of blocking high-temperature heat or flames.

[0119]

[0120] FIG. 6 is a cross-sectional side view showing the pack lead swelling when a thermal event occurs in FIG. 5, and FIG. 7 is a perspective view showing the flow of venting gas after removing the pack lead from a battery pack according to one embodiment of the present invention.

[0121] Referring to FIGS. 6 and 7, it can be seen that when a thermal event occurs in a battery cell (110) and venting gas (VG) is discharged from the battery cell (110), the pack lead (210) swells and becomes deformed. Specifically, when venting gas (VG) is discharged from the battery cell (110), the top plate (130) of the battery assembly (100) may become deformed due to the high temperature and high pressure of the venting gas (VG), and as the top plate (130) becomes deformed, it presses the pack lead (210), so that the pack lead (210) may also become deformed.

[0122] In the case of a conventional battery pack, when the top plate is deformed, the deformed top plate may swell adjacent to the pack lead or become attached to the pack lead, which may cause the space between the top plate and the pack lead to become very narrow, and as a result, the venting gas may not flow smoothly.

[0123] However, in the battery pack (10) according to the present invention, even when the top plate (130) is deformed, the spacer (300) can maintain the distance between the top plate (130) and the pack lead (210), so that the space between the top plate (130) and the pack lead (210), or venting space (VS), can be effectively maintained, and the flow of venting gas (VG) can proceed smoothly. In addition, the venting gas (VG) discharged from the battery assembly (100) toward the pack lead (210) can be smoothly discharged to the outside of the pack case (200).

[0124]

[0125] Referring to FIGS. 1, 2, and 7, the pack case (200) may further include a venting device (400). The venting device (400) may communicate the receiving space (S) inside the pack case (200) with the outside of the pack case (200). Through the venting device (400), the space between the battery assembly (100) and the pack lid (210) or the venting space (VS) and the outside may be communicated with each other.

[0126] The venting device (400) may be provided in the form of a simple hole. Alternatively, the venting device (400) may be configured to open only when a predetermined temperature or internal pressure is formed, thereby connecting the receiving space (S) and the exterior of the pack case (200).

[0127] When a thermal event occurs in the battery pack (10), the venting gas (VG) discharged from the battery cell (110) or battery assembly (100) can be effectively discharged to the outside through the venting device (400) via the venting space (VS).

[0128]

[0129] Meanwhile, as previously mentioned, the pack case (200) may further include a partition frame (240). The partition frames (240) may be provided in multiple numbers. Some of the multiple partition frames (240) may be provided with different heights.

[0130] Among the plurality of partition frames (240), a partition frame (240) having a relatively greater height may be in close contact with the pack lead (210), and a partition frame (240) having a relatively lower height may be spaced apart from the pack lead (210). For example, a partition frame (240) that extends long in the X direction may have a relatively greater height than a partition frame (240) that extends long in the Y direction and may be in close contact with the pack lead (210).

[0131] When the partition frame (240) is provided as described above, the venting gas (VG) discharged from the battery cell (110) or battery assembly (100) can pass through the space between the partition frame (240) of relatively low height and the pack lead (210) and be smoothly discharged to the outside via another battery assembly (100). In contrast, since the venting gas (VG) cannot pass through the partition frame (240) of relatively high height, the venting gas (VG) can be prevented from spreading throughout the entire pack case (200).

[0132]

[0133] FIG. 8 is a perspective view showing the overall appearance of a battery assembly according to one embodiment of the present invention, FIG. 9 is an exploded perspective view showing the battery assembly of FIG. 8, and FIG. 10 is an enlarged perspective view showing the battery cell of FIG. 9.

[0134] Hereinafter, with reference to FIGS. 8 to 10, a battery assembly (100) and a battery cell (110) according to one embodiment of the present invention will be described in more detail.

[0135] The battery assembly (100) may have a predetermined width, length, and height in the X-axis, Y-axis, and Z-axis directions, respectively.

[0136] The battery assembly (100) may include an assembly housing (120). A plurality of battery cells (110) may be stacked and accommodated inside the assembly housing (120). The assembly housing (120) may form the overall exterior of the battery assembly (100).

[0137] The assembly housing (120) may be provided with the aforementioned top plate (130). The assembly housing (120) may further include a cover frame (140) and an end cover. The cover frame (140) may cover the lower side or the -Z direction side of a plurality of battery cells (110), and may cover the left and right sides or both sides in the X direction.

[0138] The cover frame (140) may be provided in a shape with a cross-section in the shape of a 'U'. Accordingly, the upper side or +Z direction side of the cover frame (140) may be opened, and the top plate (130) may be placed in the open portion of the cover frame (140).

[0139] The end cover (150) can cover the front and rear sides and both sides in the Y direction of the plurality of battery cells (110). In the battery assembly (100), the left and right sides and the lower sides of the plurality of battery cells (110) are closed by the cover frame (140), the front and rear sides can be closed by the end cover (150), and the upper side can be opened by the top plate (130) in which the venting hole (VH) is formed. As a result, when the venting gas (VG) is discharged from the battery assembly (100), the flow of the venting gas (VG) can be guided to the upper side of the battery assembly (100).

[0140] A busbar frame assembly (160) may be placed between a plurality of battery cells (110) and an end cover (150). The busbar frame assembly (160) may be electrically connected to an electrode lead (112) described later of each of the plurality of battery cells (110).

[0141] A top cover (180) may be placed between a plurality of battery cells (110) and a top plate (130). When a thermal event occurs in a battery cell (110) and venting gas (VG) is discharged, the venting gas (VG) may pass through the top cover (180) and flow toward the pack lid (210). The top cover (180) may block the venting gas (VG) from flowing into other battery cells (110) where a thermal event has not occurred.

[0142] In another embodiment of the present invention, a battery cell (110) provided in a battery assembly (100) may include a cell case (111) and an electrode lead (112).

[0143] The battery cells (110) can be stacked along the width direction or X-axis direction of the battery assembly (100) while standing vertically or in the Z-axis direction inside the battery assembly (100).

[0144] An electrode assembly in which a positive electrode, a negative electrode, and a separator are laminated can be accommodated inside the cell case (111). The cell case (111) can have a receiving portion (111a), a sealing portion (111b), and a folding portion (111c).

[0145] An electrode assembly can be accommodated in the storage unit (111a).

[0146] The sealing portion (111b) may be a portion in which at least a portion of the edge of the storage portion (111a) is sealed.

[0147] The folding portion (111c) may be a portion of the sealing portion (111b) that is folded.

[0148] The electrode leads (112) are electrically connected to the electrode assembly and may protrude toward both sides of the battery cell (110). For example, the electrode leads (112) may protrude toward both sides of the battery cell (110) in the Y-axis direction.

[0149]

[0150] FIG. 11 is a perspective view showing a spacer with a pad member further arranged in a pack lead according to one embodiment of the present invention, viewed from below.

[0151] Referring to FIG. 11, in a pack lead (210) according to one embodiment of the present invention, a pad member (P) may be further arranged in a spacer (300). The pad member (P) may be arranged at an end of the spacer (300) on the side of the battery assembly (100).

[0152] The pad member (P) may be disposed, for example, on the lower or -Z-direction side end of the spacer (300). The pad member (P) may have elasticity. For example, the pad member (P) may include at least one material among silicone, urethane, and polyurethane. The pad member (P) may be fixedly disposed on the spacer (300). The pad member (P) may be disposed between the spacer (300) and the battery assembly (100). The pad member (P) may be compressed between the spacer (300) and the battery assembly (100).

[0153] As described above, when a pad member (P) is further arranged on the spacer (300), the assembly tolerance of the battery pack (10) can be further relaxed. In addition, external shocks or vibrations can be effectively offset.

[0154]

[0155] Fig. 12 is a perspective view showing a pack lead viewed from below according to a modified example of one embodiment of the present invention.

[0156] Referring to FIG. 12, the spacer (300) may be formed in an extended shape. Specifically, the spacer (300) may be formed to extend in a direction parallel to the stacking direction of the plurality of battery cells (110). For example, the spacer (300) may be formed to extend long along the X direction. In this case, for example, as illustrated in area 'A' of FIG. 12, the spacer (300) may be extended long along the X direction so as to cross the battery assembly (100).

[0157] When the spacer (300) is provided as described above, there is an advantage in that the flow of venting gas (VG) can be guided more effectively.

[0158]

[0159] Fig. 13 is a perspective view showing a pack lead according to another embodiment of the present invention as viewed from below, and Fig. 14 is a perspective view showing the separation bracket in Fig. 13 separated and enlarged.

[0160] Hereinafter, with reference to FIGS. 13 and 14, a spacer (300) provided in a pack lid (210) according to another embodiment of the present invention will be described in detail. In the pack lid (210) according to another embodiment of the present invention, the spacer (300) may be provided as a spacer bracket (310). That is, the spacer (300) may be provided in the form of a bracket.

[0161] The spacer (300) illustrated in FIG. 13 may be provided as a spacer bracket (310) illustrated in FIG. 14 (a). In particular, referring to FIG. 14 (a), the spacer bracket (310) may have a connecting portion (311) and a protrusion (312).

[0162] The coupling portion (311) may be a portion coupled to the pack lid (210). The coupling portion (311) may be coupled to the pack lid (210) while facing the pack lid (210). For example, the upper surface of the coupling portion (311) may be coupled to the lower surface of the pack lid (210). The coupling portion (311) may be coupled to the pack lid (210) in various ways. For example, the coupling portion (311) may be coupled to the pack lid (210) by an adhesive method. However, the coupling method of the coupling portion (311) and the pack lid (210) is not limited thereto.

[0163] The protrusion (312) may be a portion protruding toward the battery assembly (100). The protrusion (312) may be provided in a forming form at the joining portion (311). A plurality of protrusions (312) may be provided on one spacer bracket (310). For example, as illustrated in FIG. 14 (a), three protrusions (312) may be provided on one spacer bracket (310).

[0164] Each protrusion (312) may be configured in the same shape. Each protrusion (312) may be spaced apart from each other. Each protrusion (312) may be in contact with the battery assembly (100) or the top plate (130) of the battery assembly (100).

[0165] As described above, when the spacer (300) is provided as a spacer bracket (310), there is an advantage in that the spacer (300) can be easily provided to the pack lead (210). For example, by simply combining the spacer bracket (310) to the pack lead (210) that is not provided with the spacer (300), the spacer (300) can be easily provided to the pack lead (210).

[0166] In addition, when the spacer (300) is provided as a spacer bracket (310), the spacer (300) can be appropriately applied in various positions and numbers, so that the design expandability and deformability of the pack lead (210) having the spacer (300) can be improved.

[0167]

[0168] Meanwhile, referring to Fig. 14 (b), a pad member (P) may be further arranged on the spacer bracket (310). The pad member (P) may be composed of the same material as the pad member (P) arranged on the spacer (300) according to one embodiment of the present invention, as described with reference to Fig. 11.

[0169] The pad member (P) may be disposed at an end of the protrusion (312). For example, it may be disposed at a lower end or a -Z-side end of the protrusion (312). The pad member (P) may be fixedly disposed on the protrusion (312). The pad member (P) may be disposed between the protrusion (312) and the battery assembly (100). The pad member (P) may be compressed between the protrusion (312) and the battery assembly (100).

[0170] As described above, when a pad member (P) is further arranged on the spacer bracket (310) or the protrusion (312), the assembly tolerance of the battery pack (10) can be further relaxed. In addition, external shocks or vibrations can be effectively offset.

[0171]

[0172] Fig. 15 is a perspective view showing a pack lead as viewed from below according to a modified example of another embodiment of the present invention, and Fig. 16 is a perspective view showing the separation bracket in Fig. 15 separated and enlarged.

[0173] Hereinafter, with reference to FIGS. 15 and 16, a spacer (300) provided in a pack lid (210) according to a modified example of another embodiment of the present invention will be described in detail. The spacer (300) according to a modified example of another embodiment of the present invention may be formed in an extended shape. Specifically, the spacer (300) illustrated in FIG. 15 may be provided as an elongated spacer bracket (310) as illustrated in FIG. 16 (a).

[0174] The spacing bracket (310) may be formed to extend in a direction parallel to the stacking direction of the plurality of battery cells (110). For example, the spacing bracket (310) may be extended long along the X direction, extending across the battery assembly (100).

[0175] A spacer bracket (310) according to a modified example of another embodiment of the present invention may be provided with a connecting portion (311) and a protrusion (312), similar to the connecting bracket (310) described in another embodiment of the present invention. The connecting portion (311) may be configured in an elongated shape. A plurality of protrusions (312) may be arranged in a row along the longitudinal direction of the connecting portion (311).

[0176] When the spacer bracket (310) is provided as described above, the productivity of the pack lead (210) having the spacer (300) can be improved. For example, since more protrusions (312) can be provided on the joint portion (311), the number of joint portions (311) can be reduced relative to the number of protrusions (312), so that the cost and time required for the jointing process of the pack lead (210) and the spacer bracket (310) can be reduced.

[0177] Meanwhile, referring to FIG. 16 (b), a pad member (P) may be further arranged in a spacer bracket (310) according to a modified example of another embodiment of the present invention, similarly to the spacer bracket (310) according to another embodiment of the present invention illustrated in FIG. 14 (b). The description of the spacer bracket (310) according to a modified example of another embodiment of the present invention is replaced with the description of the pad member (P) arranged in the spacer bracket (310) according to another embodiment of the present invention described above and FIG. 14 (b).

[0178]

[0179] Fig. 17 is a perspective view showing a pack lead according to another modified example of another embodiment of the present invention as viewed from below, and Fig. 18 is a perspective view showing the separation bracket in Fig. 17 separated and enlarged.

[0180] Hereinafter, with reference to FIGS. 17 and 18, a spacer (300) provided in a pack lid (210) according to another modified example of another embodiment of the present invention will be described in detail. The spacer (300) according to another modified example of another embodiment of the present invention is provided as a spacer bracket (310), but may be formed in a non-extended form. Specifically, the spacer (300) illustrated in FIG. 17 may be provided as a spacer bracket (310) formed in a non-extended form, as illustrated in FIG. 18 (a).

[0181] In another modified example of another embodiment of the present invention, a spacer bracket (310) is provided such that the connecting portion (311) and the protrusion (312) correspond one to one, so that one connecting portion (311) may be provided with one protrusion (312).

[0182] When the spacing bracket (310) is provided as described above, there is an advantage in that the spacer (300) provided as the spacing bracket (310) can be placed only at the required location in the space between the pack lead (210) and the battery assembly (100).

[0183] Meanwhile, referring to FIG. 18 (b), a pad member (P) may be further arranged in a spacer bracket (310) according to a modified example of another embodiment of the present invention, similarly to the spacer bracket (310) according to another embodiment of the present invention illustrated in FIG. 14 (b). The description of the spacer bracket (310) according to another modified example of another embodiment of the present invention is replaced with the description of the pad member (P) arranged in the spacer bracket (310) according to another embodiment of the present invention described above and FIG. 14 (b).

[0184]

[0185] A plurality of spacers (300) are provided, and at least some of the plurality of spacers (300) can be placed at at least some of each corner of the battery assembly (100).

[0186] For example, as shown in area A of FIG. 17, some of the plurality of spacers (300) arranged in the area of ​​the pack lead (210) corresponding to the battery assembly (100) may be arranged at each of the four corners of area A. At this time, the spacers (300) may be provided as spacer brackets (310) as shown in FIGS. 17 and 18, but this is merely an example, and it is of course possible to provide them in a forming form, such as the spacers (300) provided in the pack lead (210) according to one embodiment of the present invention.

[0187] When the spacer (300) is provided as described above, each corner of the battery assembly (100) can be evenly supported, which has the advantage that the battery assembly (100) and the pack lead (210) can be stably and firmly placed relative to each other.

[0188]

[0189] Above, preferred examples of a battery pack (10) according to the present invention have been described. The technical idea of ​​the present invention is not limited to these examples, and may also include combinations of any two or more of them.

[0190]

[0191] Meanwhile, the battery pack (10) according to the present invention may further include various devices for controlling charging and discharging of battery cells (110), such as a BMS (Battery Management System), a current sensor, a fuse, etc., although not shown.

[0192]

[0193] Fig. 19 is a drawing showing a vehicle according to one embodiment of the present invention.

[0194] Hereinafter, referring to FIG. 19, the battery pack (10) according to the present invention can be applied to a vehicle (V) such as an electric vehicle or a hybrid vehicle. That is, the vehicle (V) according to the present invention can include the battery pack (10) according to the present invention. The battery pack (10) can be installed in a body frame or a trunk space under a vehicle seat. In addition to the battery pack (10), the vehicle (V) according to an embodiment of the present invention can further include various other components included in the vehicle. For example, the vehicle (V) according to an embodiment of the present invention can further include a body, a motor, a control device such as an ECU (electronic control unit), etc., in addition to the battery pack (10) according to an embodiment of the present invention.

[0195] In addition, it goes without saying that the battery pack (10) according to one embodiment of the present invention may be equipped in other devices, apparatuses, and facilities, such as energy storage systems that use secondary batteries, in addition to automobiles (V).

[0196]

[0197] As described above, the present invention has been described with reference to the attached drawings, focusing on preferred embodiments. However, it will be apparent to those skilled in the art that numerous obvious modifications can be made without departing from the scope of the present invention. Accordingly, the scope of the present invention should be construed as encompassing such numerous modifications by the appended claims.

[0198] [Explanation of symbols]

[0199] 10: Battery pack

[0200] 100: Battery assembly

[0201] 110: Battery cell

[0202] 111: Cell Case

[0203] 111a: Storage compartment

[0204] 111b: Sealing part

[0205] 111c: Folding section

[0206] 112: Electrode lead

[0207] 120: Assembly housing

[0208] 130: Top plate

[0209] 140: Cover frame

[0210] 150: End cover

[0211] 160: Busbar frame assembly

[0212] 170: Bulkhead member

[0213] 180: Top cover

[0214] 200: Pack Case

[0215] 210: Pack Lead

[0216] 220: Side wall

[0217] 230: Bottom

[0218] 240: Partition frame

[0219] 300: Spacer

[0220] 310: Spacing bracket

[0221] 311: Joint

[0222] 312: Protrusion

[0223] 400: Venting Device

[0224] S: Reception space

[0225] VG: Venting gas

[0226] VH: Venting Hall

[0227] VS: Venting space

[0228] P: Pad member

[0229] V: Car

Claims

1. At least one battery assembly having a plurality of battery cells; and A pack case having a receiving space in which the battery assembly is received and a pack lead covering the receiving space; The above pack lead is, A battery pack characterized by having a spacer disposed between the battery assembly and the pack lead and spacing the battery assembly and the pack lead apart.

2. In paragraph 1, The above spacer, A battery pack characterized in that a venting space is formed by spacing the battery assembly and the pack lead apart from each other.

3. In paragraph 1, The above battery assembly, A top plate is further provided to cover the plurality of battery cells and is placed on the pack lead side, The above spacer, A battery pack characterized in that it is disposed between the top plate and the pack lead, and spaced apart from the top plate and the pack lead.

4. In paragraph 1, The above battery assembly, A battery pack characterized by having at least one venting hole provided on the spacer side.

5. In paragraph 1, The above spacer, A battery pack characterized in that it is provided on the inner side of the pack lead.

6. In paragraph 1, The above pack lead is, Provided to cover the upper part of the above-mentioned accommodation space, The above spacer, A battery pack characterized in that it is provided on the lower surface of the pack lead.

7. In paragraph 1, The above spacer, A battery pack characterized in that it is formed integrally with the pack lead.

8. In paragraph 7, The above spacer, A battery pack characterized in that at least a portion of the pack lead is formed in a forming shape protruding toward the battery assembly.

9. In paragraph 1, The above spacer, A battery pack characterized by including a material having heat resistance.

10. In paragraph 1, The above spacer, A battery pack characterized in that it is arranged to pressurize the above battery assembly.

11. In paragraph 1, In the above battery assembly, the plurality of battery cells are stacked and arranged, The above spacer, It is equipped with multiple pieces, A battery pack characterized in that the plurality of battery cells are arranged in a direction parallel to the stacking direction.

12. In paragraph 1, The above pack case is, A battery pack characterized in that it further comprises a venting device that connects the above-mentioned receiving space and the outside with each other.

13. In paragraph 1, The above spacer, A battery pack characterized by having an elastic pad member disposed at an end of the battery assembly.

14. In paragraph 1, In the above battery assembly, the plurality of battery cells are stacked and arranged, The above spacer, A battery pack characterized in that it is formed by extending in a direction parallel to the stacking direction of the plurality of battery cells.

15. In paragraph 1, The above spacer, A battery pack characterized in that it is provided with a spacer bracket having a coupling portion coupled to the pack lead and a protrusion protruding toward the battery assembly.

16. In paragraph 1, The above spacer, Equipped with multiple pieces, A battery pack, characterized in that at least some of the plurality of spacers are disposed at at least some of each corner of the battery assembly.

17. A vehicle characterized by including at least one battery pack according to any one of claims 1 to 16.

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