Battery pack

Abstract

According to an example embodiment, a battery pack is provided. The battery pack can include a battery pack case including a bottom plate, a cross beam extending on the bottom plate, and a side wall on an edge of the bottom plate; a battery cell assembly including battery cells arranged in a first direction on the bottom plate and a first side beam and a second side beam spaced apart from each other in the first direction, wherein the battery cells are interposed between the first side beam and the second side beam; and a lifting belt between the battery cell assembly and the battery pack case. The lifting belt can include a first portion between the bottom 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 vertical direction perpendicular to a mounting surface of the bottom plate.

Description

Technical Field

[0001] This disclosure relates to a battery pack. This application claims the benefit of Korean Patent Application No. 10-2025-0000834, filed on January 3, 2025, the disclosure of which is incorporated herein by reference. Background Technology

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various wireless devices, such as mobile phones, laptops, and cordless vacuum cleaners. Recently, due to improvements in energy density and economies of scale, the manufacturing cost per unit capacity of secondary batteries has significantly decreased, and the driving range of battery electric vehicles (BEVs) has increased to a level comparable to that of internal combustion engine vehicles. Therefore, the primary application of secondary batteries has shifted from mobile devices to mobility applications.

[0003] Key trends in the technological development of secondary batteries for mobility applications are improvements in energy density and safety. Here, the energy density of a secondary battery refers to the maximum electrical energy it can store divided by its mass. Since high energy density is directly related to driving efficiency and the range of mobility applications, various research efforts are underway to improve the energy density of secondary batteries. Summary of the Invention

[0004] Technical issues

[0005] The technical problem to be solved by the present invention is to provide a battery pack with improved manufacturing efficiency and convenient after-sales service.

[0006] Technical solution

[0007] According to an exemplary embodiment for solving the above-described problems, a battery pack is provided. The battery pack may include: a battery pack housing including a base plate, a crossbeam extending on the base plate, and sidewalls on the edges of the base plate; a battery cell assembly including battery cells arranged along a first direction on the base plate and first and second side beams spaced apart from each other along the first direction, the battery cells being inserted between the first and second side beams; and a lifting belt located between the battery cell assembly and the battery pack housing. The lifting belt may include: a first portion located 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 vertical direction perpendicular to the mounting surface of the base plate.

[0008] The battery pack may also include: a fourth portion connected to the first portion and overlapping the second side beam in a first direction; and a fifth portion connected to the fourth portion and overlapping the second side beam in a vertical direction.

[0009] The lifting belt may include a first guide pin on the third part.

[0010] The first guide pin can face the crossbeam.

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

[0012] The first guide pin can face the first side beam.

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

[0014] The lifting belt may also include a second guide pin on the third section. The first guide pin may face the crossbeam. The second guide pin may face the first side beam.

[0015] The crossbeam 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.

[0016] The third part may include bolt holes. The first side beam may include bolt holes.

[0017] The battery pack may also include fasteners that pass through bolt holes in the third section and bolt holes in the first side beam.

[0018] The lifting belt may include a third guide pin on the fifth part.

[0019] The third guide pin may face the sidewall. The sidewall may include a guide hole corresponding to the third guide pin.

[0020] 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.

[0021] The lifting belt may also include a fourth guide pin on the fifth part. 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.

[0022] Beneficial effects

[0023] The battery pack according to an exemplary embodiment of the present disclosure includes a lifting belt between the battery pack housing and the battery cell assembly. Therefore, when a quality problem occurs in the battery cell assembly, the battery cell assembly can be easily separated and replaced.

[0024] The lifting belt according to an exemplary embodiment of this disclosure includes guide pins that can be coupled to a battery pack housing or a battery cell assembly. Therefore, fastening the lifting belt during battery pack manufacturing becomes easier, thereby improving the efficiency of the battery pack manufacturing process.

[0025] The effects obtainable from the exemplary embodiments of this disclosure are not limited to those described above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of this disclosure pertain. That is, those skilled in the art can also derive unintended effects from the exemplary embodiments of this disclosure resulting from their practice. Attached Figure Description

[0026] Figure 1 This is a top view of a battery pack according to an exemplary embodiment.

[0027] Figure 2 This is a cross-sectional view of a battery pack according to an exemplary embodiment.

[0028] Figure 3 This is a cross-sectional view of a battery pack according to an exemplary embodiment.

[0029] Figure 4 This is a perspective view of the lifting belt according to an exemplary embodiment.

[0030] Figure 5 This is a cross-sectional view of a battery pack according to an exemplary embodiment.

[0031] Figure 6 This is a cross-sectional view of a battery pack according to an exemplary embodiment.

[0032] Figure 7 This is a perspective view of the lifting belt according to an exemplary embodiment.

[0033] Figure 8 This is a cross-sectional view of a battery pack according to an exemplary embodiment.

[0034] Figure 9 This is a perspective view of the lifting belt according to an exemplary embodiment. Detailed Implementation

[0035] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Before the description, it should be noted that the terms or words used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical concept of the present disclosure, based on the principle that the inventor can appropriately define the concepts of the terms in order to best describe his / her own invention.

[0036] Therefore, the embodiments described in this specification and the configurations shown in the accompanying drawings are merely the most preferred embodiments of this disclosure and do not represent all the technical concepts of this disclosure. It should be understood that various equivalents and modifications that can replace these embodiments and configurations may exist at the time of filing this application.

[0037] Furthermore, in describing this disclosure, detailed descriptions of known configurations or functions that are determined to be relevant to this disclosure may obscure the main points of this disclosure, and such detailed descriptions will be omitted.

[0038] The embodiments of this disclosure are provided to describe the disclosure more fully to those skilled in the art. Therefore, for clarity, the shapes and dimensions of the components in the drawings may be exaggerated, omitted, or shown schematically. Consequently, the dimensions or proportions of each component do not perfectly reflect the actual dimensions or proportions.

[0039] (First embodiment)

[0040] Figure 1 This is a top view of the battery pack 100 according to an exemplary embodiment.

[0041] Figure 2 This is a cross-sectional view of the battery pack 100 according to an exemplary embodiment. Figure 2 It shows along Figure 1 The cross section taken by line A-A'.

[0042] Figure 3 This is a cross-sectional view of the battery pack 100 according to an exemplary embodiment. Figure 3 It shows along Figure 1 The cross section taken by line B-B'.

[0043] Figure 4 This is a perspective view of the lifting belt 130 according to an exemplary embodiment.

[0044] Figure 5 This is a cross-sectional view of the battery pack 100 according to an exemplary embodiment. Figure 5 It shows along Figure 1 The cross section taken by line C-C'.

[0045] Reference Figures 1 to 5 The battery pack 100 may include a battery pack housing 110, multiple battery cell assemblies 120, a lifting belt 130, and a thermal interface material (TIM) layer 170.

[0046] The battery pack housing 110 may include a base plate 111, a central beam 112, a crossbeam 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, Y, and Z directions may be substantially perpendicular to each other.

[0047] The base plate 111 can support multiple battery cell modules 120. The base plate 111 can have a flat shape.

[0048] The central beam 112 and the crossbeam 113 can separate the space where the battery cell assembly 120 is installed. The central beam 112 and the crossbeam 113 can be surrounded by the sidewall 114. The central beam 112 and the crossbeam 113 can divide the space defined by the battery pack housing 110.

[0049] The central beam 112 can extend in the X direction. The central beam 112 can be formed together with the base plate 111 by an extrusion process, or it can be welded to the base plate 111. The central beam 112 can isolate the battery cell modules 120 from each other in the Y direction.

[0050] Each crossbeam 113 may intersect with the central beam 112. Each crossbeam 113 may extend in the Y direction. The crossbeams 113 may isolate multiple battery cell modules 120 from each other in the X direction.

[0051] Each crossbeam 113 may include a guide hole 113H1 (see...) Figure 2 ) and bolt hole 113H2 (see Figure 5 Guide holes 113H1 can be configured for alignment with lifting belt 130. Each guide hole 113H1 can accommodate a guide pin 140 of lifting belt 130. Bolt holes 113H2 can be configured for engagement with side beam 122A. Side beam 122A can be engaged with crossbeam 113 via fasteners 160A passing through bolt holes 113H2 of crossbeam 113 and bolt holes 122AH2 of side beam 122A.

[0052] The sidewall 114 may be substantially perpendicular to the base plate 111. The sidewall 114 may be adjacent to an edge portion of the base plate 111. The sidewall 114 may be integrated with an edge portion of the base plate 111. The sidewall 114 may horizontally surround a plurality of battery cell assemblies 120.

[0053] Sidewall 114 may include guide hole 114H1 (see Figure 2 ) and bolt hole 114H2 (see Figure 5Guide holes 114H1 can be configured for alignment with lifting belt 130. Each guide hole 114H1 can accommodate each guide pin 140 of lifting belt 130. Bolt holes 114H2 can be configured for engagement with side beam 122B. Side beam 122B can be engaged with side wall 114 via fasteners 160B passing through bolt holes 114H2 and bolt holes 122BH2 of side beam 122B.

[0054] Multiple battery cell assemblies 120 can be disposed on the mounting surface 111M of the base plate 111 of the battery pack housing 110. The battery cell assemblies 120 can be arranged along the X and Y directions. In this example, three battery cell assemblies 120 are arranged along the X direction and two battery cell assemblies are arranged along the Y direction, such that the multiple battery cell assemblies 120 form a 2x3 matrix; however, this is for illustrative purposes and does not limit the technical concept of this disclosure in any way.

[0055] In the following description, the technical concept of this disclosure will be described with reference to embodiments in which each of the plurality of battery cell assemblies 120 does not include a module frame (i.e., where the battery pack 100 is a module-less type embodiment, also referred to as a module-less (CTP) type). However, this is a non-limiting example and does not limit the technical concept of this disclosure in any sense. Based on the description herein, those skilled in the art can readily obtain plurality of battery cell assemblies including a module frame and modular battery packs including plurality of battery cell assemblies.

[0056] Each of the multiple battery cell assemblies 120 may include multiple 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 housing. Each of the plurality of battery cells 121 may be any of a cylindrical battery cell, a prismatic battery cell, and a pouch battery cell. The electrode assembly of a cylindrical battery cell is housed in a cylindrical metal can. The electrode assembly of a prismatic battery cell is housed in a prismatic metal can. The electrode assembly of a pouch battery cell is housed in a pouch housing comprising an aluminum laminate.

[0058] An electrode assembly includes a positive electrode, a negative electrode, and a separator inserted between the positive and negative electrodes. A wound electrode assembly is formed by winding the positive electrode, the negative electrode, and the separator inserted between them. A stacked electrode assembly includes multiple positive electrodes, multiple negative electrodes, and multiple separators inserted between the multiple positive electrodes and the multiple negative electrodes in sequence.

[0059] According to an exemplary embodiment, multiple battery cells 121 may constitute multiple groups. Multiple groups may include one or more battery cells 121 connected in parallel. Multiple groups may be connected in series with each other. The number of battery cells 121 included in each of the multiple groups and the number of groups connected in series with each other can be determined based on the voltage and current to be output through each of the multiple battery cell assemblies 120.

[0060] According to an exemplary embodiment, each battery cell assembly 120 may further include a plurality of spacers. The plurality of spacers may be interposed between the plurality of battery cells 121. The plurality of spacers may comprise an elastic material and may absorb the expansion of the plurality of battery cells. According to an exemplary embodiment, the plurality of spacers may be thermal barriers. According to an exemplary embodiment, each of the plurality of spacers may have a high melting temperature and low thermal conductivity. According to an exemplary embodiment, each of the plurality of spacers may comprise a flame-retardant material, such as ceramic or coated glass. According to an exemplary embodiment, the plurality of spacers may be configured to release flame-retardant material and fire extinguishing agent in the event of a thermal runaway event.

[0061] Side beams 122A and 122B may be spaced apart from each other in the X direction, with a plurality of battery cells 121 inserted between side beams 122A and 122B. Side beams 122A and 122B may support the battery cells 121 in the X direction. Side beams 122A and 122B may have substantially the same shape. Side beams 122A and 122B may be made of aluminum. Side beams 122A and 122B may be formed by an extrusion process. Side beams 122A and 122B may be symmetrically arranged relative to the plurality of battery cells 121. Side beam 122A may include a joint 122A1 and a plate portion 122A2. Side beam 122B may include a joint 122B1 and a plate portion 122B2. Each of side beams 122A and 122B may have a shape resembling the Greek letter "Γ".

[0062] The plate portion 122A2 of the side beam 122A may have a flat plate shape that is substantially perpendicular to the X direction. The joint portion 122A1 of the side beam 122A may include a plurality of bolt holes 122AH1 (see...). Figure 3 ) and multiple bolt holes 122AH2 (see Figure 5 ).

[0063] Reference Figure 3 The connecting portion 122A1 of the side beam 122A may include multiple bolt holes 122AH1. A fastener 150A may be engaged with the bolt holes 122AH1 of the connecting portion 122A1 of the side beam 122A. The fastener 150A may pass through the bolt holes 122AH1 of the connecting portion 122A1 and the bolt holes 133H of the lifting belt 130. The fastener 150A can secure the lifting belt 130 to the side beam 122A.

[0064] Reference Figure 5 The connecting portion 122A1 of the side beam 122A may include bolt holes 122AH2. A fastener 160A may be connected to the bolt holes 122AH2 of the connecting portion 122A1 of the side beam 122A. The fastener 160A may pass through the bolt holes 122AH2 of the connecting portion 122A1 and the bolt holes 113H2 of the crossbeam 113. The fastener 160A can secure the side beam 122A to the crossbeam 113.

[0065] The plate portion 122B2 of the side beam 122B may have a flat plate shape that is substantially perpendicular to the X direction. The joint portion 122B1 of the side beam 122B may include a plurality of bolt holes 122BH1 (see...). Figure 3 ) and multiple bolt holes 122BH2 (see Figure 5 ).

[0066] Reference Figure 3 Fastener 150B can be engaged with bolt hole 122BH1 of joint 122B1 of side beam 122B. Fastener 150B can pass through bolt hole 122BH1 of joint 122B1 and bolt hole 135H of lifting belt 130. Fastener 150B can secure lifting belt 130 to side beam 122B.

[0067] Reference Figure 5 Fastener 160B can be engaged with bolt hole 122BH2 in joint 122B1 of side beam 122B. Fastener 160B can pass through bolt hole 122BH2 in joint 122B1 and bolt hole 114H2 in side wall 114. Fastener 160B can secure side beam 122B to side wall 114.

[0068] According to an exemplary embodiment, side beam 122A may include a groove into which a second portion 132 and a third portion 133 of lifting belt 130 are inserted. According to an exemplary embodiment, side beam 122B may include a groove into which a fourth portion 134 and a fifth portion 135 of lifting belt 130 are inserted.

[0069] The lifting belt 130 can be integrated into each of the side beams 122A and 122B. The lifting belt 130 may be made of metal. The lifting belt 130 may include a first part 131, a second part 132, a third part 133, a fourth part 134, a fifth part 135, and a guide pin 140.

[0070] The first portion 131 can extend in the X direction. The first portion 131 can overlap with multiple battery cells 121 in the Z direction. The first portion 131 can contact multiple battery cells 121. The first portion 131 can support multiple battery cells 121. Therefore, when the battery cell assembly 120 is placed on the battery pack housing 110 or when the battery cell assembly 120 is lifted from the battery pack housing 110, the lifting belt 130 can prevent or alleviate the sagging of multiple battery cells 121. Therefore, assembly efficiency can be improved not only during the manufacturing of the battery pack 100, but also after-sales service can be facilitated.

[0071] The first portion 131 may include end portions 131E1 and 131E2 and a central portion 131C. The central portion 131C may be located between the end portions 131E1 and 131E2. The width of the central portion 131C in the Y direction may be smaller than the width of the end portion 131E1 in the Y direction. The width of the central portion 131C in the Y direction may be smaller than the width of the end portion 131E2 in the Y direction. The width of the central portion 131C in the X direction may be greater than the width of the end portion 131E1 in the X direction. The width of the central portion 131C in the X direction may be greater than the width of the end portion 131E1 in the X direction. According to an exemplary embodiment, the first portion 131 may have an H-shape. The shape of the first portion 131 may vary depending on the size of the battery cell assembly 120 and the number of battery cells 121.

[0072] The second portion 132 and the fourth portion 134 can each be connected to the first portion 131. The second portion 132 and the fourth portion 134 can be spaced apart from each other in the X direction, with the first portion 131 inserted between the second portion 132 and the fourth portion 134. The second portion 132 and the fourth portion 134 can extend in the Z direction. The lifting belt 130 may include a curved portion between the second portion 132 and the first portion 131, and a curved portion between the fourth portion 134 and the first portion 131. The second portion 132 can overlap with the plate portion 122A2 of the first side beam 122A in the X direction. The second portion 132 can overlap with the crossbeam 113 in the X direction. The second portion 132 can cover the crossbeam 113. The fourth portion 134 can overlap with the plate portion 122B2 of the second side beam 122B in the X direction. The fourth portion 134 can overlap with the side wall 114 in the X direction. The fourth portion 134 can cover the side wall 114.

[0073] Part 3, 133, can be connected to Part 2, 132. (See reference...) Figure 4The third portion 133 may include multiple segments. These segments may be spaced apart from each other in the Y direction. Each segment may extend in the X direction. The lifting belt 130 may include curved portions between each segment of the third portion 133 and the second portion 132. The segments of the third portion 133 may be spaced apart from the first portion 131 in the Z direction, with the second portion 132 interposed between the segments of the third portion 133 and the first portion 131. The third portion 133 is composed of segments, thereby reducing the weight of the lifting belt 130.

[0074] Each section of the third part 133 may include bolt holes 133H for engaging with fasteners 150A. Each fastener 150A may pass through bolt holes 122AH1 of the side beam 122A and bolt holes 133H of the third part 133. Fasteners 150A may secure the lifting belt 130 to the side beam 122A.

[0075] Each segment of the third part 133 may include a guide pin 140. The guide pin 140 may be located between adjacent bolt holes 133H. The guide pin 140 may face the crossbeam 113. The guide pin 140 may be received in a guide hole 113H1 of the crossbeam 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.

[0076] However, the shape of the third portion 133 is not limited thereto. According to other exemplary embodiments, the third portion 133 may be formed as a single plate instead of multiple segments.

[0077] Part 5, 135, can be connected to Part 4, 134. (See reference...) Figure 4 The fifth portion 135 may include multiple segments. These segments may be spaced apart from each other in the Y direction. Each segment may extend in the X direction. The lifting belt 130 may include curved portions between each segment of the fifth portion 135 and the fourth portion 134. The segments of the fifth portion 135 may be spaced apart from the first portion 131 in the Z direction, and the fourth portion 134 is inserted between the segments of the fifth portion 135 and the first portion 131. The fifth portion 135 is composed of segments, thereby reducing the weight of the lifting belt 130.

[0078] Each section of the fifth part 135 may include bolt holes 135H for engaging with fasteners 150B. Each fastener 150B may pass through bolt holes 122BH1 of the side beam 122B and bolt holes 135H of the fifth part 135. Fasteners 150B may secure the lifting belt 130 to the side beam 122B.

[0079] Each segment of the fifth part 135 may include a guide pin 140. The guide pin 140 may be located between adjacent bolt holes 135H. The guide pin 140 may face the sidewall 114. The guide pin 140 may be received in a guide hole 114H1 in the sidewall 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.

[0080] However, the shape of the fifth portion 135 is not limited thereto. According to other exemplary embodiments, the fifth portion 135 may be formed as a single plate instead of multiple segments.

[0081] The battery pack 100 according to an exemplary embodiment of the present disclosure includes a lifting belt 130 with guide pins 140 and a battery pack housing 110 with guide holes 113H1, 114H1, such that the lifting belt 130 can be easily and accurately positioned in the correct location on the battery pack housing 110. Therefore, the efficiency and accuracy of the assembly process of the battery pack 100 can be improved.

[0082] although Figures 1 to 5 A battery cell assembly 120 between a crossbeam 113 and a side wall 114 is shown as an example, but the above description can be applied in the same or similar way to battery cell assemblies 120 between adjacent crossbeams 113. That is, the lifting belts 130 of the side beams 122A, 122B attached to the battery cell assembly 120 can be guided relative to two adjacent crossbeams 113.

[0083] The TIM layer 170 can be disposed on the base plate 111 of the battery pack housing 110. The TIM layer 170 can be interposed between each of the plurality of battery cell assemblies 120 and the base plate 111. The TIM layer 170 can comprise a resin composition. The TIM layer 170 can be formed by an application process of thermally conductive resin.

[0084] According to an exemplary embodiment, the TIM layer 170 may not be inserted between the first portion 131 of the lifting belt 130 and the base plate 111. According to an exemplary embodiment, two TIM layers 170 spaced apart in the Y direction and with the first portion 131 of the lifting belt 130 inserted between them may be inserted between each battery cell 120 and the base plate 111. That is, the first portion 131 of the lifting belt 130 may be inserted between the TIM layers 170 in the Y direction. The first portion 131 of the lifting belt 130 of each of the plurality of battery cell assemblies 120 may be at the same height as the TIM layer 170 relative to the mounting surface 111M of the base plate 111. However, this is merely an example and does not limit the technical concept of this disclosure in any way.

[0085] The resin composition can be a room-temperature curable composition. That is, the curing reaction of the resin composition can begin and proceed at room temperature. The curing reaction of the resin composition can be accelerated at temperatures above room temperature. The curing reaction rate of the resin composition at temperatures above room temperature can be faster than the curing reaction rate of the resin composition at room temperature. As a non-limiting example, the base resin of the resin composition can be any one of silicone resin, polyol resin, epoxy resin, and acrylic resin.

[0086] The curing agent of the resin composition can be selected based on the base resin of the resin composition. For example, when the base resin of the resin composition is a silicone resin, the curing agent can be a siloxane compound; when the base resin of the resin composition is a polyol resin, an isocyanate compound can be used as a curing agent; when the base resin of the resin composition is an epoxy resin, the curing agent can be an amine compound; and when the base resin of the resin composition is an acrylic resin, the curing agent can be an isocyanate compound.

[0087] The inorganic filler in the resin composition can have a relatively high thermal conductivity. According to an exemplary embodiment, the thermal conductivity of the inorganic filler in the resin composition can be about 1 W / mK or greater. According to an exemplary embodiment, the thermal conductivity of the inorganic filler in the resin composition can be 5 W / mK or greater. According to an exemplary embodiment, the thermal conductivity of the inorganic filler in the resin composition can be 10 W / mK or greater. According to an exemplary embodiment, the thermal conductivity of the inorganic filler in the resin composition can be about 15 W / mK or greater.

[0088] According to an exemplary embodiment, the inorganic filler of the resin composition may comprise ceramics. For example, the inorganic filler of the resin composition may comprise any one of alumina (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 comprise carbon fillers. The resin composition may also comprise any one of, for example, fumed silica, clay, and calcium carbonate.

[0089] Although not shown in the accompanying drawings, the battery pack 100 may include a venting device. The venting device may be integrated into one of the sidewalls 114. The sidewall 114 integrated into the venting device may include a venting path connected to the venting device. The venting device may be configured to delay heat propagation by venting high-temperature gases inside the battery pack 100 to the outside when at least one of the plurality of battery cell assemblies 120 is in a thermal runaway state.

[0090] Here, thermal runaway of multiple battery cell modules 120 is a state in which the temperature changes of multiple battery cell modules 120 further accelerate the temperature changes, which is an uncontrollable positive feedback. Multiple battery cell modules 120 in the thermal runaway state exhibit rapid temperature rise and emit large amounts of high-pressure gas and burning debris.

[0091] The battery pack 100 may include a cover attached to a sidewall 114. The cover may cover components disposed inside the battery pack 100, such as battery cell assembly 120 and electrical components. The cover may be secured to the battery pack 100 by a mechanical fastening device such as bolts.

[0092] The battery pack 100 may also include an intermediate busbar. Multiple battery cell modules 120 can be connected in series via the intermediate busbar, and the battery pack 100 can output a high voltage.

[0093] The battery pack 100 may also include electrical components. These electrical components may be housed within the battery pack housing 110. They may be located between one of the sidewalls 114, where an venting device is installed, and the plurality of battery cell assemblies 120.

[0094] Electrical components may include, for example, a battery management system (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 at specific nodes within multiple individual cell assemblies 120 and measuring the temperature at designated locations within the battery pack 100. The battery pack 100 may include sensors for measuring the aforementioned voltage, current, and temperature.

[0095] Balancing the battery pack 100 is an operation to reduce deviations between the multiple battery cell modules 120. Controlling 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, thereby preventing a shortened lifespan for each of the multiple battery cell modules 120.

[0096] Electrical components may also include cooling devices, power relay assemblies (PRAs), safety plugs, etc. Cooling devices may include cooling fans. The cooling fans prevent each of the multiple battery cell assemblies 120 from overheating by circulating air within the battery pack 100. The PRA can be configured to supply or disconnect power from the high-voltage battery to an external load (e.g., a vehicle engine). In the event of an abnormal voltage such as a voltage surge, the PRA can protect the multiple battery cell assemblies 120 and the external load (e.g., the vehicle engine) by disconnecting power to the external load (e.g., the vehicle engine).

[0097] (Second Embodiment)

[0098] Figure 6and Figure 7 This is a diagram used to illustrate a battery pack 100' according to other exemplary embodiments.

[0099] Figure 6 This is a cross-sectional view showing a battery pack 100' according to an exemplary embodiment. Figure 6 It shows along Figure 1 The cross section taken by line A-A'.

[0100] Figure 7 This is a perspective view showing the lifting belt 130' according to an exemplary embodiment.

[0101] exist Figure 6 and Figure 7 In, it has the same Figures 1 to 5 Components with the same reference numerals may have the same description applied to them as in the first embodiment described above, and the same descriptions will be omitted. Hereinafter, the description will focus on the second embodiment, which differs from the first embodiment.

[0102] Battery pack 100' and Figures 1 to 5 The difference in the battery pack 100 lies in the position of the guide pin 140' of the lifting belt 130' and the shape of the side beams 122A' and 122B'.

[0103] The lifting belt 130' may include guide pins 140' on the third part 133 and guide pins 140' on the fifth part 135. Guide pins 140' on the third part 133 may face the side beam 122A'. Guide pins 140' on the third part 133 may face the joint 122A1' of the side beam 122A'. Guide pins 140' on the fifth part 135 may face the side beam 122B'. Guide pins 140' on the fifth part 135 may face the joint 122B1' of the side beam 122B'. The crossbeam 113' may not include bolt holes. Figure 2 (113H1 in the middle).

[0104] The joint 122A1' of the side beam 122A' may include guide holes 122AH3. Each guide hole 122AH3 may accommodate each guide pin 140' on the third part 133. Each guide hole 122AH3 may be formed at a position corresponding to each guide pin 140' on the third part 133. Each guide hole 122AH3 may have a shape complementary to each guide pin 140' of the third part 133.

[0105] The joint 122B1' of the side beam 122B' may include guide holes 122BH3. Each guide hole 122BH3 may accommodate each guide pin 140' on the fifth part 135. Each guide hole 122BH3 may be formed at a position corresponding to each guide pin 140' on the fifth part 135. Each guide hole 122BH3 may have a shape complementary to each guide pin 140' of the fifth part 135.

[0106] The battery pack 100' according to an exemplary embodiment of the present disclosure includes a lifting belt 130' and side beams 122A' and 122B'. The lifting belt 130' includes a guide pin 140', and the side beams 122A' and 122B' respectively include guide holes 122AH3 and 122BH3, so that the lifting belt 130' can be easily aligned and attached to each battery cell assembly 120. Therefore, the efficiency and accuracy of the assembly process of the battery pack 100 can be improved.

[0107] (Third embodiment)

[0108] Figure 8 and Figure 9 This is a diagram illustrating a battery pack 100 according to other exemplary embodiments.

[0109] Figure 8 This is a cross-sectional view showing a battery pack 100 according to an exemplary embodiment. Figure 8 It shows along Figure 1 The cross section taken by line A-A'.

[0110] Figure 9 This is a perspective view showing the lifting belt 130" according to an exemplary embodiment.

[0111] exist Figure 8 and Figure 9 In, it has the same Figures 1 to 7 Components with the same reference numerals may have the above description applied to the first and second embodiments, and the same descriptions will be omitted. Hereinafter, the description will focus on the configuration of the third embodiment, which differs from the first and second embodiments.

[0112] Battery pack 100" and the battery pack of the first embodiment ( Figures 1 to 5 100) and the battery pack of the second embodiment ( Figure 6 and Figure 7 The difference between the lifting belt 130" and the lifting belt 130" is that the lifting belt 130" of the battery pack 100" includes two guide pins 140 and 140'. That is, the lifting belt 130" of the battery pack 100" includes the guide pin 140 of the first embodiment and the guide pin 140' of the second embodiment.

[0113] The lifting belt 130" may include guide pins 140 and 140' on the third part 133 and guide pins 140 and 140' on the fifth part 135. Guide pin 140 on the third part 133 may face the crossbeam 113. Guide pin 140' on the third part 133 may face the joint 122A1' of the side beam 122A'. Guide pin 140 may be on one surface of the third part 133, and guide pin 140' may be on the other surface of the third part 133.

[0114] The guide pin 140 on the fifth part 135 may face the side wall 114. The guide pin 140' on the fifth part 135 may face the joint 122B1' of the side beam 122B'. The guide pin 140 may be on one surface of the fifth part 135, and the guide pin 140' may be on the other surface of the fifth part 135.

[0115] The crossbeam 113 may include guide holes 113H1. Each guide hole 113H1 may receive each guide pin 140 on the third part 133. Each guide hole 113H1 may be formed at a position corresponding to each guide pin 140 on the third part 133. Each guide hole 113H1 may have a shape complementary to each guide pin 140 on the third part 133.

[0116] The joint 122A1' of the side beam 122A' may include guide holes 122AH3. Each guide hole 122AH3 may accommodate each guide pin 140' on the third part 133. Each guide hole 122AH3 may be formed at a position corresponding to each guide pin 140' on the third part 133. Each guide hole 122AH3 may have a shape complementary to each guide pin 140' on the third part 133.

[0117] The sidewall 114 may include guide holes 114H1. Each guide hole 114H1 may receive each guide pin 140 on the fifth part 135. Each guide hole 114H1 may be formed at a position corresponding to each guide pin 140 on the fifth part 135. Each guide hole 114H1 may have a shape complementary to each guide pin 140 on the fifth part 135.

[0118] The joint 122B1' of the side beam 122B' may include guide holes 122BH3. Each guide hole 122BH3 may accommodate each guide pin 140' on the fifth part 135. Each guide hole 122BH3 may be formed at a position corresponding to each guide pin 140' on the fifth part 135. Each guide hole 122BH3 may have a shape complementary to each guide pin 140' on the fifth part 135.

[0119] exist Figure 8and Figure 9 The illustration shows an embodiment in which the respective guide pins 140 and 140' are aligned in the Z direction, but this disclosure is not limited thereto. According to other exemplary embodiments, the respective guide pins 140 may not be aligned with the respective guide pins 140' in the Z direction.

[0120] The battery pack 100" according to an exemplary embodiment of the present disclosure includes a lifting belt 130 with guide pins 140 and a battery pack housing 110 with guide holes 113H1 and 114H1, such that the lifting belt 130" can be easily and accurately positioned on the battery pack housing 110. Furthermore, the battery pack 100" includes a lifting belt 130" with guide pins 140' and side beams 122A' and 122B' respectively including guide holes 122AH3 and 122BH3, such that the lifting belt 130" can be easily attached to each battery cell assembly 120. Therefore, the efficiency and accuracy of the assembly process of the battery pack 100 can be improved.

[0121] The present disclosure has been described in more detail above with reference to the accompanying drawings and embodiments. However, the configurations described in the drawings or the embodiments described in this specification are merely one embodiment of the present disclosure and do not represent all the technical concepts of the present disclosure. It should be understood that various equivalents and modifications may exist to replace these configurations and embodiments at the time of filing this application.

Claims

1. A battery pack, comprising: A battery pack housing, the battery pack housing including a base plate, a crossbeam extending on the base plate, and sidewalls on the edge of the base plate; A battery cell assembly, the battery cell assembly including battery cells arranged on the base plate along a first direction, and a first side beam and a second side beam spaced apart from each other along the first direction, the battery cells being inserted between the first side beam and the second side beam; as well as A lifting belt, located between the individual battery cell assembly and the battery pack housing. The lifting belt includes: The first part is located between the base plate and the battery cell; The second part, which is connected to the first part and overlaps with the first side beam in the first direction; and The third part is connected to the second part and overlaps with the first side beam in a vertical direction perpendicular to the mounting surface of the base plate.

2. The battery pack according to claim 1, further comprising: The fourth part is connected to the first part and overlaps with the second side beam in the first direction; as well as The fifth part is connected to the fourth part and overlaps with the second side beam in the vertical direction.

3. The battery pack according to claim 1, wherein, The lifting belt includes a first guide pin on the third part.

4. The battery pack according to claim 3, wherein, The first guide pin faces the crossbeam.

5. The battery pack according to claim 4, wherein, The crossbeam includes a guide hole corresponding to the first guide pin.

6. The battery pack according to claim 3, wherein, The first guide pin faces the first side beam.

7. The battery pack according to claim 6, wherein, The first side beam includes a guide hole corresponding to the first guide pin.

8. The battery pack according to claim 3, wherein, The lifting belt also includes a second guide pin on the third part. The first guide pin faces the crossbeam, and The second guide pin faces the first side beam.

9. The battery pack according to claim 8, wherein, The crossbeam includes a guide hole corresponding to the first guide pin, and The first side beam includes a guide hole corresponding to the second guide pin.

10. The battery pack according to claim 1, wherein, The third part includes bolt holes, and The first side beam includes bolt holes.

11. The battery pack according to claim 10, further comprising: Fasteners that pass through the bolt holes of the third portion and the bolt holes of the first side beam.

12. The battery pack according to claim 1, wherein, The lifting belt includes a third guide pin on the fifth section.

13. The battery pack according to claim 12, wherein, The third guide pin faces the sidewall, and The sidewall includes a guide hole corresponding to the third guide pin.

14. The battery pack according to claim 12, wherein, The third guide pin faces the second side beam, and The second side beam includes a guide hole corresponding to the third guide pin.

15. The battery pack according to claim 12, wherein, The lifting belt also includes a fourth guide pin on the fifth part. The third guide pin faces the sidewall. The fourth guide pin faces the second side beam. The sidewall includes a guide hole corresponding to the third guide pin, and The second side beam includes a guide hole corresponding to the fourth guide pin.

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