Battery pack

Abstract

According to exemplary embodiments, a battery pack is provided. The battery pack may comprise: a pack housing including a base plate, a cross beam extending on the base plate, and a side wall on an edge of the base plate; a battery cell assembly including battery cells arranged on the base plate in a first direction, and first and second side beams spaced apart from each other in the first direction with the battery cells therebetween; and a lift band between the battery cell assembly and the pack housing. The lift band may include a first portion between the base plate and the battery cells, a second portion connected to the first portion and overlapping the first side beam in the first direction, and a third portion connected to the second portion and overlapping the first side beam in a perpendicular direction perpendicular to a mounting surface of the base plate.

Description

battery pack

[0001] The present invention relates to a battery pack. The present application claims the benefit of Korean application No. 10-2025-0000834, filed on January 3, 2025, which is incorporated herein by reference in its entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] The technological development trend for rechargeable batteries in mobility is the improvement of energy density and safety. Here, the energy density of a rechargeable battery is defined as the maximum electrical energy that can be stored by the battery's mass. As high energy density is directly linked to driving efficiency and range in mobility applications, various studies are being conducted to improve this energy density.

[0004] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with improved manufacturing process efficiency and easy after-sales service.

[0005] According to exemplary embodiments for solving the above-described problem, a battery pack is provided. The battery pack may include: a pack housing comprising a base plate, a cross beam extending on the base plate, and a side wall on the edge of the base plate; a battery cell assembly comprising battery cells arranged in a first direction on the base plate, and first and second side beams spaced apart from the first direction with the battery cells in between; and a lift band between the battery cell assembly and the pack housing. The lift band may include: a first portion between the base plate and the battery cells; a second portion connected to the first portion and overlapping with the first side beam in the first direction; and a third portion connected to the second portion and overlapping with the first side beam in a vertical direction perpendicular to the mounting surface of the base plate.

[0006] It may further include a fourth part connected to the first part and overlapping with the second side beam in the first direction; and a fifth part connected to the fourth part and overlapping with the second side beam in the vertical direction.

[0007] The lift band above may include a first guide pin on the third part.

[0008] The first guide pin above can face the cross beam.

[0009] The above cross beam may include a guide hole corresponding to the first guide pin.

[0010] The first guide pin can face the first side beam.

[0011] The first side beam may include a guide hole corresponding to the first guide pin.

[0012] The lift band may further include a second guide pin on the third portion. The first guide pin may face the cross beam. The second guide pin may face the first side beam.

[0013] The cross beam may include a guide hole corresponding to the first guide pin. The first side beam may include a guide hole corresponding to the second guide pin.

[0014] The above third part may include a bolting hole. The above first side beam may include a bolting hole.

[0015] It may further include a fixing device that penetrates the bolting hole of the third part and the bolting hole of the first side beam.

[0016] The above lift band may include a third guide pin on the fifth part.

[0017] The third guide pin may face the side wall. The side wall may include a guide hole corresponding to the third guide pin.

[0018] The third guide pin may face the second side beam. The second side beam may include a guide hole corresponding to the third guide pin.

[0019] The lift band may further include a fourth guide pin on the fifth portion. The third guide pin may face the side wall. The fourth guide pin may face the second side beam. The side wall may include a guide hole corresponding to the third guide pin. The second side beam may include a guide hole corresponding to the fourth guide pin.

[0020] A battery pack according to exemplary embodiments of the present invention includes a lifting band between the pack housing and the battery cell assembly. Accordingly, when a quality issue occurs in the battery cell assembly, the battery cell assembly can be easily separated and replaced.

[0021] A lifting band according to exemplary embodiments of the present invention includes guide pins that can be coupled to a pack housing or a battery cell assembly. Accordingly, the lifting band can be easily fastened during the manufacture of a battery pack, thereby improving the efficiency of the battery pack manufacturing process.

[0022] The effects obtainable from the exemplary embodiments of the present invention are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects resulting from the implementation of the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0023] FIG. 1 is a top view of a battery pack according to exemplary embodiments.

[0024] FIG. 2 is a cross-sectional view of a battery pack according to exemplary embodiments.

[0025] FIG. 3 is a cross-sectional view of a battery pack according to exemplary embodiments.

[0026] FIG. 4 is a perspective view of a lifting band according to exemplary embodiments.

[0027] FIG. 5 is a cross-sectional view of a battery pack according to exemplary embodiments.

[0028] FIG. 6 is a cross-sectional view of a battery pack according to exemplary embodiments.

[0029] FIG. 7 is a perspective view of a lifting band according to exemplary embodiments.

[0030] FIG. 8 is a cross-sectional view of a battery pack according to exemplary embodiments.

[0031] FIG. 9 is a perspective view of a lifting band according to exemplary embodiments.

[0032] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0033] Therefore, 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; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0034] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0035] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0036]

[0037] (1st embodiment)

[0038] FIG. 1 is a top view of a battery pack (100) according to exemplary embodiments.

[0039] FIG. 2 is a cross-sectional view of a battery pack (100) according to exemplary embodiments. FIG. 2 shows a cross-section along A-A' of FIG. 1.

[0040] FIG. 3 is a cross-sectional view of a battery pack (100) according to exemplary embodiments. FIG. 3 shows a cross-section along B-B' of FIG. 1.

[0041] FIG. 4 is a perspective view of a lifting band (130) according to exemplary embodiments.

[0042] FIG. 5 is a cross-sectional view of a battery pack (100) according to exemplary embodiments. FIG. 5 illustrates a cross-section along C-C' of FIG. 1.

[0043]

[0044] Referring to FIGS. 1 to 5, the battery pack (100) may include a pack housing (110), a plurality of battery cell assemblies (120), a lifting band (130), and TIM (Thermal Interface Material) layers (170).

[0045] The pack housing (110) may include a base plate (111), a center beam (112), cross beams (113), and side walls (114). Here, two directions substantially parallel to the mounting surface (111M) of the base plate (111) are defined as the X direction and the Y direction, and a direction substantially perpendicular to the mounting surface (111M) of the base plate (111) is defined as the Z direction. The X direction, the Y direction, and the Z direction may be substantially perpendicular to each other.

[0046] The base plate (111) can support a plurality of battery cell assemblies (120). The base plate (111) may have a flat plate shape.

[0047] The center beam (112) and cross beams (113) can partition the space in which the battery cell assembly (120) is mounted. The center beam (112) and cross beams (113) can be surrounded by side walls (114). The center beam (112) and cross beams (113) can divide the space defined by the pack housing (110).

[0048] The center beam (112) may extend in the X direction. The center beam (112) may be formed by an extrusion process together with the base plate (111) or welded to the base plate (111). The center beam (112) may isolate the battery cell assemblies (120) in the Y direction.

[0049] Each of the cross beams (113) can intersect the center beam (112). Each of the cross beams (113) can extend in the Y direction. The cross beams (113) can isolate a plurality of battery cell assemblies (120) in the X direction.

[0050] Each cross beam (113) may include guide holes (113H1, see FIG. 2) and bolting holes (113H2, see FIG. 5). The guide holes (113H1) may be configured for alignment with the lifting band (130). Each of the guide holes (113H1) may accommodate each of the guide pins (140) of the lifting band (130). The bolting holes (113H2) may be configured for connection with the side beam (122A). The side beam (122A) may be connected to the cross beam (113) by fasteners (160A) that penetrate the bolting holes (113H2) of the cross beam (113) and the bolting holes (122AH2) of the side beam (122A).

[0051] The side wall (114) may be substantially perpendicular to the base plate (111). The side wall (114) may be adjacent to the edge portions of the base plate (111). The side wall (114) may be joined to the edge portions of the base plate (111). The side wall (114) may horizontally surround a plurality of battery cell assemblies (120).

[0052] The side wall (114) may include guide holes (114H1, see FIG. 2) and bolting holes (114H2, see FIG. 5). The guide holes (114H1) may be configured for alignment with the lifting band (130). Each of the guide holes (114H1) may accommodate each of the guide pins (140) of the lifting band (130). The bolting holes (114H2) may be configured for connection with the side beam (122B). The side beam (122B) may be connected to the side wall (114) by fasteners (160B) that penetrate the bolting holes (114H2) of the side wall (114) and the bolting holes (122BH2) of the side beam (122B).

[0053]

[0054] A plurality of battery cell assemblies (120) may be placed on the mounting surface (111M) of the base plate (111) of the pack housing (110). The battery cell assemblies (120) may be arranged in the X direction and the Y direction. In this example, three battery cell assemblies (120) are arranged in the X direction and two battery cell assemblies are arranged in the Y direction, so that the plurality of battery cell assemblies (120) form a matrix of 2 rows and 3 columns, but this is for illustrative purposes only and does not limit the technical concept of the present invention in any sense.

[0055] Hereinafter, the technical concept of the present invention is described with reference to an embodiment in which each of the plurality of battery cell assemblies (120) does not include a module frame (i.e., an embodiment in which the battery pack (100) is of the modular type). However, this is a non-limiting example and does not limit the technical concept of the present invention in any sense. A person skilled in the art will be able to easily arrive at a plurality of battery cell assemblies including a module frame and a modular type battery pack including the same based on what is described herein.

[0056] Each of the plurality of battery cell assemblies (120) may include a plurality of battery cells (121) and side beams (122A, 122B).

[0057] Each of the plurality of battery cells (121) may include an electrode assembly, an electrolyte, and a case. Each of the plurality of battery cells (121) may be any one of a cylindrical battery cell, a prismatic battery cell, and a pouch-type battery cell. The electrode assembly of the cylindrical battery cell is embedded in a cylindrical metal can. The electrode assembly of the prismatic battery cell is embedded in a prismatic metal can. The electrode assembly of the pouch-type battery cell is embedded in a pouch case containing an aluminum laminate sheet.

[0058] An electrode assembly includes an anode, a cathode, and a separator interposed between the anode and the cathode. A jelly roll type electrode assembly is formed by winding an anode, a cathode, and a separator interposed between them. A stack type electrode assembly includes a plurality of anodes, a plurality of cathodes, and a plurality of separators interposed between them, which are stacked sequentially.

[0059] According to exemplary embodiments, a plurality of battery cells (121) may form a plurality of banks. A plurality of banks may include one or more parallel-connected battery cells (121). A plurality of banks may be connected in series with each other. The number of battery cells (121) included in each of the plurality of banks and the number of banks connected in series with each other may be determined according to the voltage and current to be output through each of the plurality of battery cell assemblies (120).

[0060] According to exemplary embodiments, each of the battery cell assemblies (120) may further include a plurality of separators. The plurality of separators may be interposed between the plurality of battery cells (121). The plurality of separators may include a flexible material and may absorb swelling of the plurality of battery cells. According to exemplary embodiments, the plurality of separators may be thermal barriers. According to exemplary embodiments, each of the plurality of separators may have a high melting temperature and low thermal conductivity. According to exemplary embodiments, each of the plurality of separators may include a flame-retardant material, such as ceramic and coated glass material. According to exemplary embodiments, the plurality of separators may be configured to release a fire retarding material and a fire extinguishing agent in the event of a thermal runaway event.

[0061]

[0062] Side beams (122A, 122B) may be spaced apart from each other in the X direction with a plurality of battery cells (121) in between. Side beams (122A, 122B) may support the battery cells (121) in the X direction. Side beams (122A, 122B) may have substantially the same shape as each other. Side beams (122A, 122B) may include aluminum. Side beams (122A, 122B) may be provided by an extrusion process. Side beams (122A, 122B) may be arranged symmetrically with respect to the plurality of battery cells (121). Side beam (122A) may include a coupling portion (122A1) and a plate portion (122A2). Side beam (122B) may include a coupling portion (122B1) and a plate portion (122B2). Each of the side beams (122A, 122B) can have a shape approximately like the Greek letter 'Γ'.

[0063] The plate portion (122A2) of the side beam (122A) may have a flat plate shape substantially perpendicular to the X direction. The joining portion (122A1) of the side beam (122A) may include a plurality of bolting holes (122AH1, see FIG. 3) and a plurality of bolting holes (122AH2, see FIG. 5).

[0064] Referring to FIG. 3, the connecting portion (122A1) of the side beam (122A) may include a plurality of bolting holes (122AH1). A fixer (150A) may be connected to the bolting holes (122AH1) of the connecting portion (122A1) of the side beam (122A). The fixer (150A) may pass through the bolting holes (122AH1) of the connecting portion (122A1) and the bolting holes (133H) of the lifting band (130). The fixer (150A) may secure the lifting band (130) to the side beam (122A).

[0065] Referring to FIG. 5, the connecting portion (122A1) of the side beam (122A) may include bolting holes (122AH2). A fixer (160A) may be connected to the bolting holes (122AH2) of the connecting portion (122A1) of the side beam (122A). The fixer (160A) may pass through the bolting holes (122AH2) of the connecting portion (122A1) and the bolting holes (113H2) of the cross beam (113). The fixer (160A) may secure the side beam (122A) to the cross beam (113).

[0066] The plate portion (122B2) of the side beam (122B) may have a flat plate shape substantially perpendicular to the X direction. The joining portion (122B1) of the side beam (122B) may include a plurality of bolting holes (122BH1, see FIG. 3) and a plurality of bolting holes (122BH2, see FIG. 5).

[0067] Referring to FIG. 3, a fixer (150B) can be coupled to the bolting hole (122BH1) of the joint portion (122B1) of the side beam (122B). The fixer (150B) can pass through the bolting hole (122BH1) of the joint portion (122B1) and the bolting hole (135H) of the lifting band (130). The fixer (150B) can secure the lifting band (130) to the side beam (122B).

[0068] Referring to FIG. 5, a fixer (160B) can be attached to a bolting hole (122BH2) of a joint portion (122B1) of a side beam (122B). The fixer (160B) can pass through the bolting hole (122BH2) of the joint portion (122B1) and the bolting hole (114H2) of the side wall (114). The fixer (160B) can fix the side beam (122B) to the side wall (114).

[0069] According to exemplary embodiments, the side beam (122A) may include a groove into which the second portion (132) and the third portion (133) of the lifting band (130) are inserted. According to exemplary embodiments, the side beam (122B) may include a groove into which the fourth portion (134) and the fifth portion (135) of the lifting band (130) are inserted.

[0070]

[0071] The lifting band (130) can be attached to each of the side beams (122A, 122B). The lifting band (130) may include a metal material. The lifting band (130) may include a first part (131), a second part (132), a third part (133), a fourth part (134), a fifth part (135), and guide pins (140).

[0072] The first part (131) may extend in the X direction. The first part (131) may overlap with a plurality of battery cells (121) in the Z direction. The first part (131) may come into contact with a plurality of battery cells (121). The first part (131) may support a plurality of battery cells (121). Accordingly, the lifting band (130) can prevent or mitigate sagging of the plurality of battery cells (121) when placing battery cell assemblies (120) on the pack housing (110) or lifting the battery cell assemblies (120) from the pack housing (110). Accordingly, not only is assembly efficiency improved during the manufacturing of the battery pack (100), but after-sales service can also be facilitated.

[0073] The first part (131) may include end portions (131E1, 131E2) and a central portion (131C). The central portion (131C) may be located between the end portions (131E1, 131E2). The width in the Y direction of the central portion (131C) may be smaller than the width in the Y direction of the end portion (131E1). The width in the Y direction of the central portion (131C) may be smaller than the width in the Y direction of the end portion (131E2). The width in the X direction of the central portion (131C) may be larger than the width in the X direction of the end portion (131E1). The width in the X direction of the central portion (131C) may be larger than the width in the X direction of the end portion (131E1). According to exemplary embodiments, the first part (131) may be H-shaped. The shape of the first part (131) can be changed according to the size of the battery cell assemblies (120) and the number of battery cells (121), etc.

[0074] The second part (132) and the fourth part (134) may each be connected to the first part (131). The second part (132) and the fourth part (134) may be spaced apart from each other in the X direction with the first part (131) in between. The second part (132) and the fourth part (134) may extend in the Z direction. The lifting band (130) may include a curved portion between the second part (132) and the first part (131) and a curved portion between the fourth part (134) and the first part (131). The second part (132) may overlap with the plate portion (122A2) of the first side beam (122A) in the X direction. The second part (132) may overlap with the cross beam (113) in the X direction. The second part (132) may cover the cross beam (113). The fourth part (134) may overlap with the plate portion (122B2) of the second side beam (122B) in the X direction. The fourth part (134) may overlap with the side wall (114) in the X direction. The fourth part (134) may cover the side wall (114).

[0075] The third part (133) may be connected to the second part (132). Referring to FIG. 4, the third part (133) may include a plurality of segments. The plurality of segments may be spaced apart from each other in the Y direction. Each segment may extend in the X direction. The lifting band (130) may include a curved portion between each segment of the third part (133) and the second part (132). The segments of the third part (133) may be spaced apart from the first part (131) in the Z direction with the second part (132) in between. The third part (133) may be composed of segments to reduce the weight of the lifting band (130).

[0076] Each of the segments of the third part (133) may include bolting holes (133H) for connection with the fixers (150A). Each of the fixers (150A) may pass through the bolting hole (122AH1) of the side beam (122A) and the bolting hole (133H) of the third part (133). The fixers (150A) may secure the lifting band (130) to the side beam (122A).

[0077] Each segment of the third part (133) may include a guide pin (140). The guide pin (140) may be located between adjacent bolting holes (133H). The guide pin (140) may face the cross beam (113). The guide pin (140) may be received in a guide hole (113H1) of the cross beam (113). The guide hole (113H1) may be formed at a position corresponding to the guide pin (140). The guide hole (113H1) may have a shape complementary to the guide pin (140).

[0078] However, the shape of the third part (133) is not limited to that described above. According to other exemplary embodiments, the third part (133) may be formed as a single plate rather than a plurality of segments.

[0079] The fifth part (135) may be connected to the fourth part (134). Referring to FIG. 4, the fifth part (135) may include a plurality of segments. The plurality of segments may be spaced apart from each other in the Y direction. Each segment may extend in the X direction. The lifting band (130) may include a curved portion between each segment of the fifth part (135) and the fourth part (134). The segments of the fifth part (135) may be spaced apart from the first part (131) in the Z direction with the fourth part (134) in between. The fifth part (135) is composed of segments, which can reduce the weight of the lifting band (130).

[0080] Each of the segments of the fifth part (135) may include bolting holes (135H) for connection with the fixers (150B). Each of the fixers (150B) may pass through the bolting hole (122BH1) of the side beam (122B) and the bolting hole (135H) of the fifth part (135). The fixers (150B) may secure the lifting band (130) to the side beam (122B).

[0081] Each segment of the fifth part (135) may include a guide pin (140). The guide pin (140) may be located between adjacent bolting holes (135H). The guide pin (140) may face the side wall (114). The guide pin (140) may be received in a guide hole (114H1) of the side wall (114). The guide hole (114H1) may be formed at a position corresponding to the guide pin (140). The guide hole (114H1) may have a shape complementary to the guide pin (140).

[0082] However, the shape of the fifth part (135) is not limited to that described above. According to other exemplary embodiments, the fifth part (135) may be formed as a single plate rather than a plurality of segments.

[0083] A battery pack (100) according to exemplary embodiments of the present invention comprises a lifting band (130) including guide pins (140) and a pack housing (110) including guide holes (113H1, 114H1), so that the lifting band (130) can be easily and precisely seated at an accurate position in the pack housing (110). Accordingly, the efficiency and accuracy of the assembly process of the battery pack (100) can be improved.

[0084] In FIGS. 1 to 5, a battery cell assembly (120) between a cross beam (113) and a side wall (114) is described as an example, but the above description is applicable in the same or similar way to battery cell assemblies (120) between adjacent cross beams (113). That is, a lifting band (130) coupled to the side beams (122A, 122B) of the battery cell assembly (120) may be guided with respect to two adjacent cross beams (113).

[0085]

[0086] TIM layers (170) may be provided on the base plate (111) of the pack housing (110). TIM layers (170) may be interposed between each of the plurality of battery cell assemblies (120) and the base plate (111). The TIM layers (170) may comprise a resin composition. The TIM layers (170) may be provided by a thermal resin application process.

[0087] According to exemplary embodiments, TIM layers (170) may not be interposed between the first portion (131) of the lifting band (130) and the base plate (111). According to exemplary embodiments, two TIM layers (170) spaced apart in the Y direction with the first portion (131) of the lifting band (130) in between each battery cell assembly (120) and the base plate (111) may be interposed. That is, the first portion (131) of the lifting band (130) may be interposed between the TIM layers (170) in the Y direction. The first portion (131) of the lifting band (130) of each of the plurality of battery cell assemblies (120) may be at the same level with respect to the mounting surface (111M) of the base plate (111) and the TIM layers (170). However, this is merely an example and does not limit the technical concept of the present invention in any sense.

[0088] The resin composition may be a room-temperature curable composition. That is, the curing reaction of the resin composition may begin and proceed at room temperature. The curing reaction of the resin composition may be accelerated at a temperature higher than room temperature. At a temperature higher than room temperature, the curing reaction rate of the resin composition may be faster than the curing reaction rate of the resin composition at room temperature. As a non-limiting example, the main component of the resin composition may be any one of silicone resin, polyol resin, epoxy resin, and acrylic resin.

[0089] The curing agent of the resin composition can be selected according to the main component of the resin composition. For example, if the main component of the resin composition is a silicone resin, the curing agent may be a siloxane compound; if the main component of the resin composition is a polyol resin, the curing agent may be an isocyanate compound; if the main component of the resin composition is an epoxy resin, the curing agent may be an amine compound; and if the main component of the resin composition is an acrylic resin, the curing agent may be an isocyanate compound.

[0090] The inorganic filler of the resin composition may have relatively high thermal conductivity. According to exemplary embodiments, the thermal conductivity of the inorganic filler of the resin composition may be about 1 W / mK or higher. According to exemplary embodiments, the thermal conductivity of the inorganic filler of the resin composition may be 5 W / mK or higher. According to exemplary embodiments, the thermal conductivity of the inorganic filler of the resin composition may be 10 W / mK or higher. According to exemplary embodiments, the thermal conductivity of the inorganic filler of the resin composition may be about 15 W / mK or higher.

[0091] According to exemplary embodiments, the inorganic filler of the resin composition may include ceramic. For example, the inorganic filler of the resin composition may include any one of aluminum oxide (Al2O3), aluminum nitride (AlN), boron nitride (BN), silicon nitride (Si3N4), silicon carbide (SiC), beryllium oxide (BeO), zinc oxide (ZnO), aluminum hydroxide (Al(OH)3), and boehmite. The resin composition may also include a carbon filler. The resin composition may include, for example, any one of fumed silica, clay, and calcium carbonate.

[0092]

[0093] Although not illustrated in the drawing, the battery pack (100) may include exhaust devices. The exhaust devices may be coupled to any one of the side walls (114). The side wall (114) coupled to the exhaust devices may include an exhaust path connected to the exhaust devices. The exhaust devices may be configured to delay thermal propagation by releasing high-temperature gas inside the battery pack (100) to the outside when at least one of the plurality of battery cell assemblies (120) is in a thermal runway state.

[0094] Here, thermal runaway of multiple battery cell assemblies (120) is a state in which a temperature change of multiple battery cell assemblies (120) further accelerates the temperature change, which is an uncontrollable positive feedback. Multiple battery cell assemblies (120) in a thermal runaway state exhibit a rapid temperature rise and emit a large amount of high-pressure gas and combustion residue.

[0095] The battery pack (100) may include a lead coupled to a side wall (114). The lead may cover elements placed inside the battery pack (100), such as battery cell assemblies (120) and electrical components. The lead may be secured to the battery pack (100) by mechanical coupling means, such as a bolt.

[0096] The battery pack (100) may further include interbusbars. Multiple battery cell assemblies (120) may be connected in series by the interbusbars, and the battery pack (100) may output a high voltage.

[0097] The battery pack (100) may further include electrical components. The electrical components may be placed within the pack housing (110). The electrical components may be placed between one of the side walls (114) where exhaust devices are installed and a plurality of battery cell assemblies (120).

[0098] Electrical components may include, for example, a BMS. The BMS may be configured to perform monitoring, balancing, and control of the battery pack. Monitoring of the battery pack (100) may include measuring the voltage and current of specific nodes within a plurality of battery cell assemblies (120) and measuring the temperature of set locations within the battery pack (100). The battery pack (100) may include sensors for measuring the voltage, current, and temperature described above.

[0099] Balancing of the battery pack (100) is an operation that reduces deviations between multiple battery cell assemblies (120). Control of the battery pack (100) includes preventing overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack (100) can operate under optimal conditions, and accordingly, the shortening of the lifespan of each of the multiple battery cell assemblies (120) can be prevented.

[0100] The electrical components may further include a cooling device, a Power Relay Assembly (PRA), and a safety plug. The cooling device may include a cooling fan. The cooling fan can prevent overheating of each of the multiple battery cell assemblies (120) by circulating air inside the battery pack (100). The PRA may be configured to supply or cut off power from the high-voltage battery to an external load (e.g., a vehicle motor). The PRA can protect the multiple battery cell assemblies (120) and the external load (e.g., a vehicle motor) by cutting off power supply to the external load (e.g., a vehicle motor) in situations where abnormal voltage occurs, such as a voltage surge.

[0101]

[0102] (2nd Example)

[0103] FIGS. 6 and FIGS. 7 are drawings for illustrating a battery pack (100') according to other exemplary embodiments.

[0104] FIG. 6 is a cross-sectional view showing a battery pack (100') according to exemplary embodiments. FIG. 6 shows a cross-section along A-A' of FIG. 1.

[0105] FIG. 7 is a perspective view showing a lifting band (130') according to exemplary embodiments.

[0106] In FIGS. 6 and 7, the components having the same drawing numbers as in FIGS. 1 to 5 may be described as described above in the first embodiment, and such descriptions will be omitted. Hereinafter, the components of the second embodiment that differ from the first embodiment will be described in detail.

[0107]

[0108] The battery pack (100') differs from the battery pack (100) of FIGS. 1 to 5 in the position of the guide pins (140') of the lifting band (130') and the shape of the side beams (122A', 122B').

[0109] The lifting band (130') may include guide pins (140') on the third part (133) and guide pins (140') on the fifth part (135). The guide pins (140') on the third part (133) may face the side beam (122A'). The guide pins (140') on the third part (133) may face the connecting portion (122A1') of the side beam (122A'). The guide pins (140') on the fifth part (135) may face the side beam (122B'). The guide pins (140') on the fifth part (135) may face the connecting portion (122B1') of the side beam (122B'). The cross beam (113') may not include bolting holes (113H1 in FIG. 2).

[0110] The connecting portion (122A1') of the side beam (122A') may include guide holes (122AH3). Each of the guide holes (122AH3) may accommodate each of the guide pins (140') on the third portion (133). Each of the guide holes (122AH3) may be formed at a position corresponding to each of the guide pins (140') on the third portion (133). Each of the guide holes (122AH3) may have a shape complementary to each of the guide pins (140') of the third portion (133).

[0111] The connecting portion (122B1') of the side beam (122B') may include guide holes (122BH3). Each of the guide holes (122BH3) may accommodate each of the guide pins (140') on the fifth portion (135). Each of the guide holes (122BH3) may be formed at a position corresponding to each of the guide pins (140') on the fifth portion (135). Each of the guide holes (122BH3) may have a shape complementary to each of the guide pins (140') of the fifth portion (135).

[0112] A battery pack (100') according to exemplary embodiments of the present invention comprises a lifting band (130') including guide pins (140') and side beams (122A', 122B') each including guide holes (122AH3, 122BH3), so that the lifting band (130') can be easily aligned and coupled to each of the battery cell assemblies (120). Accordingly, the efficiency and accuracy of the assembly process of the battery pack (100) can be improved.

[0113]

[0114] (3rd Example)

[0115] FIGS. 8 and FIGS. 9 are drawings for illustrating a battery pack (100) according to other exemplary embodiments.

[0116] FIG. 8 is a cross-sectional view showing a battery pack (100) according to exemplary embodiments. FIG. 8 shows a cross-section along A-A' of FIG. 1.

[0117] FIG. 9 is a perspective view showing a lifting band (130) according to exemplary embodiments.

[0118] In FIGS. 8 and 9, the components having the same reference numerals as in FIGS. 1 to 7 may be described as described above in the first and second embodiments, and such descriptions will be omitted. Hereinafter, the components of the third embodiment, which differ from the first and second embodiments, will be described in detail.

[0119]

[0120] The battery pack (100) differs from the battery pack of the first embodiment (100 in FIGS. 1 to 5) and the battery pack of the second embodiment (100' in FIGS. 6 and 7) in that the lifting band (130) includes guide pins (140, 140'). That is, the lifting band (130) of the battery pack (100) includes both the guide pins (140) of the first embodiment and the guide pins (140') of the second embodiment.

[0121] The lifting band (130) may include guide pins (140, 140') on the third part (133) and guide pins (140, 140') on the fifth part (135). The guide pins (140) on the third part (133) may face the cross beam (113). The guide pins (140') on the third part (133) may face the connecting part (122A1') of the side beam (122A'). The guide pins (140) may be on one side of the third part (133) and may be on the other side of the third part (133) and the guide pins (140').

[0122] The guide pins (140) on the fifth part (135) may face the side wall (114). The guide pins (140') on the fifth part (135) may face the connecting portion (122B1') of the side beam (122B'). The guide pins (140) may be on one side of the fifth part (135), and the guide pins (140') may be on the other side of the fifth part (135).

[0123] The cross beam (113) may include guide holes (113H1). Each of the guide holes (113H1) may accommodate each of the guide pins (140) on the third part (133). Each of the guide holes (113H1) may be formed at a position corresponding to each of the guide pins (140) on the third part (133). Each of the guide holes (113H1) may have a shape complementary to each of the guide pins (140) on the third part (133).

[0124] The connecting portion (122A1') of the side beam (122A') may include guide holes (122AH3). Each of the guide holes (122AH3) may accommodate each of the guide pins (140') on the third portion (133). Each of the guide holes (122AH3) may be formed at a position corresponding to each of the guide pins (140') on the third portion (133). Each of the guide holes (122AH3) may have a shape complementary to each of the guide pins (140') on the third portion (133).

[0125] The side wall (114) may include guide holes (114H1). Each of the guide holes (114H1) may accommodate each of the guide pins (140) on the fifth part (135). Each of the guide holes (114H1) may be formed at a position corresponding to each of the guide pins (140) on the fifth part (135). Each of the guide holes (114H1) may have a shape complementary to each of the guide pins (140) on the fifth part (135).

[0126] The connecting portion (122B1') of the side beam (122B') may include guide holes (122BH3). Each of the guide holes (122BH3) may accommodate each of the guide pins (140') on the fifth portion (135). Each of the guide holes (122BH3) may be formed at a position corresponding to each of the guide pins (140) on the fifth portion (135). Each of the guide holes (122BH3) may have a shape complementary to each of the guide pins (140') on the fifth portion (135).

[0127] FIGS. 8 and 9 illustrate an embodiment in which each guide pin (140) and each guide pin (140') are aligned in the Z direction, but are not limited thereto. According to other exemplary embodiments, each guide pin (140) may not be aligned with each guide pin (140') in the Z direction.

[0128] A battery pack (100) according to exemplary embodiments of the present invention comprises a lifting band (130) comprising guide pins (140) and a pack housing (110) comprising guide holes (113H1, 114H1), so that the lifting band (130) can be easily and precisely seated on the pack housing (110). In addition, the battery pack (100) comprises a lifting band (130) comprising guide pins (140') and side beams (122A', 122B') each comprising guide holes (122AH3, 122BH3), so that the lifting band (130) can be easily coupled to each of the battery cell assemblies (120). Accordingly, the efficiency and accuracy of the assembly process of the battery pack (100) can be improved.

[0129]

[0130] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

Claims

1. A pack housing comprising a base plate, a cross beam extending on the base plate, and a side wall on the edge of the base plate; A battery cell assembly comprising battery cells arranged in a first direction on a base plate, and first and second side beams spaced apart from the first direction with the battery cells in between; and Includes a lift band between the battery cell assembly and the pack housing, and The above lift band is, A first portion between the base plate and the battery cells; A second part connected to the first part and overlapping with the first side beam in the first direction; and A battery pack comprising a third part connected to the second part and overlapping with the first side beam in a vertical direction perpendicular to the mounting surface of the base plate.

2. In Paragraph 1, A fourth part connected to the first part and overlapping with the second side beam in the first direction; and A battery pack characterized by further including a fifth part connected to the fourth part and overlapping in a vertical direction with the second side beam.

3. In Paragraph 1, A battery pack characterized in that the lift band above includes a first guide pin on the third part.

4. In Paragraph 3, A battery pack characterized in that the first guide pin faces the cross beam.

5. In Paragraph 4, A battery pack characterized in that the cross beam includes a guide hole corresponding to the first guide pin.

6. In Paragraph 3, A battery pack characterized in that the first guide pin faces the first side beam.

7. In Paragraph 6, A battery pack characterized in that the first side beam includes a guide hole corresponding to the first guide pin.

8. In Paragraph 3, The above lift band further includes a second guide pin on the third part, and The first guide pin faces the cross beam, and A battery pack characterized in that the second guide pin faces the first side beam.

9. In Paragraph 8, The above cross beam includes a guide hole corresponding to the first guide pin, and A battery pack characterized in that the first side beam includes a guide hole corresponding to the second guide pin.

10. In Paragraph 1, The above third part includes a bolting hole, and A battery pack characterized in that the first side beam includes a bolting hole.

11. In Paragraph 10, A battery pack characterized by further including a fixing member penetrating the bolting hole of the third part and the bolting hole of the first side beam.

12. In Paragraph 1, A battery pack characterized in that the above-mentioned lift band includes a third guide pin on the fifth part.

13. In Paragraph 12, The third guide pin above faces the side wall, and A battery pack characterized in that the above-mentioned side wall includes a guide hole corresponding to the third guide pin.

14. In Paragraph 12, The third guide pin faces the second side beam, and A battery pack characterized in that the second side beam includes a guide hole corresponding to the third guide pin.

15. In Paragraph 12, The above lift band further includes a fourth guide pin on the fifth part, and The third guide pin faces the side wall, and The above-mentioned fourth guide pin faces the above-mentioned second side beam, and The above side wall includes a guide hole corresponding to the third guide pin, and A battery pack characterized in that the second side beam includes a guide hole corresponding to the fourth guide pin.

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