Battery pack and method of manufacturing the battery pack

Abstract

Embodiments provide a method of manufacturing a battery pack. The method includes preparing a battery pack housing including a bottom plate, a sidewall, and a crossbeam, assembling a pull tab to the battery pack housing, and installing a battery cell assembly in the battery pack housing.

Description

Technical Field

[0001] This disclosure relates to a battery pack and a method for manufacturing the battery pack. This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0105498, filed on August 7, 2024, the entire contents of which are incorporated herein by reference. Background Technology

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as power sources for various types of wireless devices, such as mobile phones, laptops, and cordless vacuum cleaners. Recently, due to the significant reduction in the manufacturing cost per unit capacity of secondary batteries caused by increased energy density and economies of scale, and the increase in the driving range of battery electric vehicles (BEVs) to the same level as gasoline vehicles, the primary use of secondary batteries has shifted from mobile devices to mobility.

[0003] The trend in the technological development of secondary batteries for mobility applications is towards increased energy density and safety. Here, the energy density of a secondary battery is a value obtained by dividing the maximum level of electrical energy that the battery can store by its mass. High energy density in secondary batteries is directly related to the driving efficiency and range of mobility applications; therefore, various studies are underway to improve the energy density of secondary batteries. Summary of the Invention

[0004] Technical issues

[0005] This disclosure aims to provide a battery pack that can be serviced aftermarket and a method for manufacturing the battery pack.

[0006] Technical solution

[0007] An embodiment provides a method for manufacturing a battery pack. The method includes preparing a battery pack housing including a base plate, side walls, and crossbeams; assembling lifting straps to the battery pack housing; and installing individual battery cell assemblies within the battery pack housing.

[0008] The battery pack housing may also include a guide pin located on the crossbeam, and the lifting strap may include holes, with a portion of the holes in the lifting strap being penetrated by the guide pin.

[0009] Installing the battery cell assembly into the battery pack housing may include fastening the battery cell assembly and the lifting strap together by bolting.

[0010] An embodiment provides a housing-strip assembly, including: a battery pack housing, the battery pack housing including a base plate, sidewalls, and a first crossbeam and a second crossbeam; and a lifting strap located between the first crossbeam and the second crossbeam. The lifting strap includes: a lifting portion extending in a first direction parallel to a mounting surface of the base plate; an extension portion connected to the lifting portion and having a width greater than the lifting portion in a second direction perpendicular to the first direction; a vertical portion connected to the extension portion and perpendicular to the lifting portion; and a connecting portion protruding from the vertical portion in the first direction.

[0011] The vertical section can face the first crossbeam.

[0012] The joint can overlap with the first crossbeam in each of the first and second directions perpendicular to the third direction.

[0013] The joint may include a hole.

[0014] The battery pack housing may include a guide pin embedded in the first crossbeam and passing through a hole.

[0015] An embodiment provides a battery pack. The battery pack includes: a battery pack housing, the battery pack housing including a base plate and a first crossbeam and a second crossbeam located on the base plate, the first crossbeam and the second crossbeam being spaced apart from each other in a first direction and extending in a second direction perpendicular to the first direction; a battery cell assembly disposed between the first crossbeam and the second crossbeam, the battery cell assembly including a plurality of battery cells arranged in the first direction and a first side beam and a second side beam spaced apart from each other, the plurality of battery cells being located between the first side beam and the second side beam; and a lifting strap located between the battery cell assembly and the base plate.

[0016] The lifting strap may include a first fastening part located between the first side beam and the first cross beam, and a second fastening part located between the second side beam and the second cross beam.

[0017] The first fastening part may include a hole.

[0018] The battery pack housing may also include a first guide pin embedded in the first crossbeam and passing through a hole.

[0019] The battery cell assembly may also include a through hole and a fastening device for securing the lifting strap and the first side beam together.

[0020] Beneficial effects

[0021] According to embodiments of this disclosure, the battery pack includes a battery cell assembly, a base plate, and a lifting strap between the battery cell assembly and the base plate. Therefore, when a quality problem occurs in a portion of the battery cell assembly, the battery cell assembly with the quality problem can be separated and replaced with another battery cell assembly.

[0022] The effects achievable by the embodiments of this disclosure are not limited to those described above, and those skilled in the art to which the embodiments of this disclosure pertain will clearly derive and understand other effects not described herein based on the following description. In other words, those skilled in the art can derive unintended effects from the embodiments of this disclosure when implementing them. Attached Figure Description

[0023] Figure 1 This is a flowchart of a battery pack manufacturing method according to an embodiment.

[0024] Figures 2 to 8 This is a diagram used to describe a method for manufacturing a battery pack according to an embodiment.

[0025] Figure 9 This is a perspective view of the battery pack according to an embodiment. Detailed Implementation

[0026] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before describing the embodiments of the present disclosure, the terms or expressions used in this specification and claims should not be construed as limited to terms or expressions as commonly understood or defined in common dictionaries, but should be understood based on the principle that the inventors of this application may appropriately define the terms or expressions to best interpret the present disclosure according to the meanings and concepts corresponding to the present disclosure.

[0027] Therefore, the configurations shown in the embodiments and accompanying drawings described herein are merely examples of this disclosure and do not reflect all the technical concepts of this disclosure. It should be understood that various equivalents and modifications have been made to replace this configuration as of the filing date of this application.

[0028] When it is determined that well-known configurations or functions related to the description of this disclosure obscure the subject matter of this disclosure due to unnecessary details, these configurations or functions will not be described in detail.

[0029] Because embodiments of this disclosure are provided to illustrate the disclosure more fully to those skilled in the art, the shapes, dimensions, etc., of the components shown in the drawings may be shown enlarged, omitted, or schematically for clarity. Therefore, it should not be construed that the dimensions or proportions of the components fully reflect their actual dimensions or proportions.

[0030] (First embodiment)

[0031] Figure 1 This is a flowchart of a battery pack manufacturing method according to an embodiment.

[0032] Figures 2 to 8 This is a diagram used to describe a method for manufacturing a battery pack according to an embodiment.

[0033] More specifically, Figure 2 A battery pack housing 110 and a plurality of lifting straps 130 are shown according to an embodiment. Figure 3 This is a perspective view of the lifting band at 130 degrees. Figure 4 and Figure 5 This is a perspective view showing the battery cell assembly 120 mounted on the battery pack housing 110. Figure 7 It is along Figure 6 The sectional view taken by line 6I-6I', and Figure 8 It is along Figure 6 The sectional view taken from line 6II-6II'.

[0034] Reference Figure 1 and Figure 2 In P110, a battery pack housing 110 can be fabricated. The battery pack housing 110 may include a base plate 111, side walls 112, 113, 114, and 115, and crossbeams 116, 117, and 118. Here, two directions substantially parallel to the mounting surface 111M of the base plate 111 are defined as the X-axis and Y-axis directions, and a direction substantially perpendicular to the mounting surface 111M of the base plate 111 is defined as the Z-axis direction. The X-axis, Y-axis, and Z-axis directions may be substantially perpendicular to each other.

[0035] The base plate 111 may have a flat plate shape. Side walls 112, 113, 114, and 115 may be substantially perpendicular to the base plate 111. Side walls 112, 113, 114, and 115 may be adjacent to the edge portion of the base plate 111. Side walls 112, 113, 114, and 115 may be joined to the edge portion of the base plate 111.

[0036] The base plate 111 may include multiple plates bonded together by friction stir welding. Each of the multiple plates of the base plate 111 and each of the sidewalls 112 and 113 may be provided by an extrusion process.

[0037] The extrusion direction of each of the plurality of plates of base plate 111 and side walls 112 and 113 can be the X-axis direction. That is, except for deformation due to additional tooling, the YZ cross section of each of the plurality of plates of base plate 111 and side walls 112 and 113, according to their position in the X-axis direction, can be constant. Here, the YZ cross section can be substantially parallel to the Y-axis and Z-axis directions and substantially perpendicular to the X-axis direction. Base plate 111 and side walls 112 and 113 can be arranged in the Y-axis direction. Side walls 114 and 115 and crossbeams 116, 117 and 118 can also be provided by an extrusion process.

[0038] The base plate 111 may include an intermediate beam 111CB. The intermediate beam 116 may project from the mounting surface 111M in the Z-axis direction. The intermediate beam 116 may extend in the X-axis direction.

[0039] Each of sidewalls 112 and 113 may be substantially perpendicular to the Y-axis direction. Each of sidewalls 114 and 115 may be substantially perpendicular to the X-axis direction.

[0040] Each of the crossbeams 116, 117, and 118 may extend in the Y-axis direction. Crossbeams 116, 117, and 118 may be spaced apart from each other in the X-axis direction. Each of the crossbeams 116, 117, and 118 may be mounted on a base plate 111. Each of the crossbeams 116, 117, and 118 may be welded to the base plate 111 or bolted to it. Crossbeams 116, 117, and 118 may be surrounded by sidewalls 112, 113, 114, and 115.

[0041] Horizontal beam 117 can be located between horizontal beams 116 and 118. Horizontal beam 116 can be located between side wall 114 and horizontal beam 117. Horizontal beam 118 can be located between side wall 115 and horizontal beam 117.

[0042] The thickness of crossbeams 116 and 118 (e.g., their thickness in the X-axis direction) may differ from the thickness of crossbeam 117. The thickness of each of crossbeams 116 and 118 (e.g., their thickness in the X-axis direction) may be less than the thickness of crossbeam 117. The thickness of crossbeams 116 and 118 (e.g., their thickness in the X-axis direction) may be substantially the same.

[0043] Next, refer to Figures 1 to 4 In P120, multiple lifting straps 130 can be assembled to the battery pack housing 110. In this example, the battery pack housing 110 and the lifting straps 130 can be arranged without a fixing method such as bolted connection. According to the embodiment, Figure 2 The workpiece shown can be referred to as a housing-within-a-assembly.

[0044] Multiple lifting straps 130 can be assembled onto the battery pack housing 110 to load the battery cell assembly 120 (see...) Figure 5 The lifting strap 130 can be inserted between crossbeams 116 and 117 or between crossbeams 117 and 118. For example, each of the plurality of lifting straps 130 may contain a metal such as aluminum.

[0045] Each of the plurality of lifting straps 130 may include a lifting portion 131, expansion portions 132 and 133, vertical portions 134 and 135, and fastening portions 136 and 137. According to an embodiment, the expansion portions 132, vertical portions 134, and fastening portions 136 may be symmetrical to the expansion portions 133, vertical portions 135, and fastening portions 137.

[0046] The lifting portion 131 can extend in the X-axis direction. The lifting portion 131 can be substantially perpendicular to the Z-axis direction. The width of the lifting portion 131 in the Y-axis direction can be greater than the thickness of the lifting portion 131 in the Z-axis direction. The lifting portion 131 can contact the base plate 111.

[0047] Extensions 132 and 133 may be spaced apart from each other, with a lifting section 131 between them. Each of extensions 132 and 133 may be connected to the lifting section 131. Each of extensions 132 and 133 may contact the base plate 111. The width of each of extensions 132 and 133 in the Y-axis direction may differ from the width of the lifting section 131 in the Y-axis direction. The width of each of extensions 132 and 133 in the Y-axis direction may be greater than the width of the lifting section 131 in the Y-axis direction. Therefore, when viewed from above, each of the plurality of lifting straps 130 may have an H-shape, a dog bone shape, or a dumbbell shape.

[0048] The vertical portion 134 can be connected to the extension portion 132. The vertical portion 134 can be spaced apart from the lifting portion 131, with the extension portion 132 therebetween. The vertical portion 135 can be connected to the extension portion 133. The vertical portion 135 can be spaced apart from the lifting portion 131, with the extension portion 133 therebetween.

[0049] Each of the vertical portions 134 and 135 may be substantially perpendicular to the lifting portion 131 and each of the extension portions 132 and 133. The vertical portions 134 and 135 may be substantially perpendicular to the X-axis direction. The width of each of the vertical portions 134 and 135 in the Y-axis direction may be substantially the same as the width of each of the extension portions 132 and 133 in the Y-axis direction, but the embodiment is not limited thereto. Each of the vertical portions 134 and 135 may face a corresponding one of the crossbeams 116, 117, and 118.

[0050] Fastening portion 136 can be connected to vertical portion 134. Fastening portion 136 can protrude from vertical portion 134 in the X-axis direction. Fastening portions 136 can be spaced apart from each other in the Y-axis direction. Fastening portions 136 can be spaced apart from extension portion 132, with vertical portion 134 therebetween. Each fastening portion 136 can include hole 136H. A portion of hole 136H can be used for assembling multiple lifting straps 130. A portion of hole 136H can be penetrated by guide pins 116G, 117G, and 118G to guide the assembly of multiple lifting straps 130. A portion of other holes 136H can be used for connection with battery cell assembly 120 (see...). Figure 6 Tighten.

[0051] Fastening portion 137 can be connected to vertical portion 135. Fastening portion 137 can protrude from vertical portion 135 in the X-axis direction. Fastening portions 137 can be spaced apart from each other in the Y-axis direction. Fastening portions 137 can be spaced apart from extension portion 133, with vertical portion 135 therebetween. Each fastening portion 137 can include hole 137H. A portion of hole 137H can be used for assembling multiple lifting straps 130. A portion of hole 137H can be penetrated by guide pins 116G, 117G, and 118G to guide the assembly of multiple lifting straps 130. A portion of other holes 137H can be used for connection with battery cell assembly 120 (see...). Figure 6 Tighten.

[0052] Fasteners 136 and 137 may face the upper surface (i.e., the surface perpendicular to the Z-axis direction) of one of the crossbeams 116, 117, and 118. Crossbeam 117 is inserted between crossbeams 116 and 118, thus allowing for a greater number of fasteners 136 and 137 overlapping in the Z-axis direction than each of crossbeams 116 and 118. Fasteners 136 and 137 may be inserted between crossbeams 116, 117, and 118 and the side beams 125 of the battery cell assembly 120.

[0053] Next, refer to Figure 1 and Figures 5 to 8 The battery cell assembly 120 can be mounted on the battery pack housing 110. The battery cell assembly 120 can be placed in a space separated by the intermediate beam 111CB and the crossbeams 116, 117, and 118. The battery cell assembly 120 mounted on the battery pack housing 110 can be located on the base plate 111. The battery cell assembly 120 may include multiple battery cells 121, side beams 125, and mounting devices 129.

[0054] 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 a cylindrical battery cell, a prismatic battery cell, or a pouch battery cell. The electrode assembly of a cylindrical battery cell is embedded in a cylindrical metal can. The electrode assembly of a prismatic battery cell is embedded in a prismatic metal can. The electrode assembly of a pouch battery cell is embedded in a pouch housing comprising an aluminum laminate.

[0055] An electrode assembly may include a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. A wound electrode assembly is manufactured by winding a positive electrode, a negative electrode, and a separator inserted between the positive and negative electrodes. A stacked electrode assembly may include multiple positive electrodes and multiple negative electrodes stacked sequentially, and multiple separators inserted between the multiple positive electrodes and the multiple negative electrodes.

[0056] According to an embodiment, multiple battery cells 121 can form 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 by the voltage and current output through the battery cell assembly 120.

[0057] According to an embodiment, the battery cell assembly 120 may further include a plurality of pads. The plurality of pads may be interposed between the plurality of battery cells 121. The plurality of pads may contain an elastic material and absorb the expansion of the plurality of battery cells 121.

[0058] Side beams 125 may be spaced apart from each other, with multiple battery cells 121 between them. The side beams 125 may have generally the same shape. The side beams 125 may contain a metal such as aluminum. The side beams 125 may be provided by an extrusion process. The side beams 125 may be arranged symmetrically with respect to the multiple battery cells 121. Each side beam 125 may include a plate portion 125P and a joint portion 125C. Each side beam 125 may have a generally Γ shape resembling the Greek character.

[0059] Each side beam 125's plate portion 125P may have a flat plate shape perpendicular to the X-axis direction. The joint portion 125C of each side beam 125 may include multiple bolt holes.

[0060] Plate portion 125P may be substantially parallel to each of the Y-axis and Z-axis directions. Plate portion 125P may be substantially perpendicular to the X-axis direction. The thickness of joint portion 125C in the X-axis direction may be greater than the thickness of plate portion 125P in the X-axis direction. Joint portion 125C may protrude outward relative to plate portion 125P in the battery cell assembly 120. Joint portion 125C may be connected to plate portion 125P. Joint portion 125C may be connected to the upper part of plate portion 125P.

[0061] Each of the side beams 125 of the battery cell assembly 120 can be coupled to a corresponding one of the plurality of lifting straps 130. P130 may include securing each of the side beams 125 of the battery cell assembly 120 to a corresponding one of the plurality of lifting straps 130 via fastening devices 129. For example, each fastening device 129 may be a bolt. Each fastening device 129 may be coupled to a base plate 111.

[0062] Therefore, the hole 136H of each fastener 136 and the hole 137H of each fastener 137 can be penetrated by one of the fixing device 129 and the guide pins 116G, 117G and 118G. The guide pins 116G, 117G and 118G can be at least partially embedded in the crossbeams 116, 117 and 118, but the embodiment is not limited thereto.

[0063] Each side beam 125 may include a groove 125G. The groove 125G may be in the plate portion 125P. The groove 125G may be part of the plate portion 125P and is recessed in the X-axis direction. The groove 125G may be located approximately at the center of the plate portion 125P in the Y-axis direction. The vertical portion 134 of the corresponding lifting strap 130 in the lifting strap 130 may be inserted into the groove 125G of one side beam 125, and the vertical portion 135 of the corresponding lifting strap 130 in the lifting strap 130 may be inserted into the groove 125G of another side beam 125.

[0064] The side beam 125 can be fixed to the base plate 111 by long bolts passing through the side beam 125 and the crossbeams 116, 117 and 118. A TIM layer 140 can be further inserted between the battery cell assembly 120 and the base plate 111. The TIM layer 140 may contain a resin composition. The TIM layer 140 can be provided by a thermoplastic resin coating process.

[0065] The battery cell assembly 120 may also include a first integrated circuit assembly, a second integrated circuit assembly, and a flexible flat cable (FFC) assembly. The first integrated circuit assembly may include an insulating frame, integrated circuits, busbars, sensing boards, sensing strips, temperature sensors, wires, and an insulating cover. The first integrated circuit assembly can provide electrical connections between the plurality of battery cells 121, output the final voltage of the plurality of battery cells 121, and includes physical and functional components for measuring the voltage (or current) of nodes within a circuit composed of the plurality of battery cells 121.

[0066] Except that the second integrated circuit component does not include a busbar, the second integrated circuit component is substantially the same as the first integrated circuit component. The first and second integrated circuit components can be electrically connected via an FFC component. Therefore, signals sensed by the second integrated circuit component (e.g., temperature and voltage) can be transmitted to the first integrated circuit component via the FFC component.

[0067] (Second Embodiment)

[0068] Figure 9 A battery pack 100 according to an embodiment is shown.

[0069] It can be executed repeatedly Figure 1 The P130 is used to supply battery pack 100. (See reference...) Figure 2 and Figure 9 The battery pack 100 may include a battery pack housing 110, multiple battery cell assemblies 120, and multiple lifting straps 130. The battery pack 100 is the final form of a battery system to be installed in mobile devices, etc.

[0070] Multiple battery cell assemblies 120 may be located on the mounting surface 111M of the base plate 111 of the battery pack housing 110. The battery cell assemblies 120 may be arranged in the X-axis and Y-axis directions. In this example, two battery cell assemblies 120 are arranged in the X-axis direction and two battery cell assemblies 120 are arranged in the Y-axis direction, such that the multiple battery cell assemblies 120 form a matrix of two rows and two columns; however, the technical concept of this disclosure should not be construed as limited to this in any sense.

[0071] The base plate 111 can support multiple battery cell modules 120. The side walls 112, 113, 114 and 115 can horizontally surround the multiple battery cell modules 120.

[0072] The lifting portion 131 of each of the plurality of lifting straps 130 may overlap with a corresponding one of the plurality of battery cell assemblies 120 in the Z-axis direction. The lifting portion 131 of each of the plurality of lifting straps 130 may be aligned with the center of the plurality of battery cell assemblies 120 (e.g., its center in the Y-axis direction).

[0073] The battery pack 100 may include a venting device. The venting device may be integrated with one of sidewalls 112, 113, 114, and 115. The sidewalls 112, 113, 114, and 115 integrated with the venting device may include venting paths connected to the venting device. The venting device may be configured to delay heat propagation by venting hot gases from the interior of the battery pack 100 to the exterior when at least one of the plurality of battery cell assemblies 120 is in a thermal runaway state.

[0074] Here, the thermal runaway state of multiple battery cell modules 120 is a state in which the temperature change of multiple battery cell modules 120 accelerates the temperature change, that is, runaway positive feedback. The temperature of the multiple battery cell modules 120 in the thermal runaway state rises rapidly, and a large amount of high-pressure gas and combustion debris are emitted.

[0075] The battery pack 100 may include a cover that engages with sidewalls 112, 113, 114, and 115. The cover may cover internal components of the battery pack 100, such as battery cell assemblies 120 and electronic components. The cover may be secured to the battery pack 100 by a mechanical fastening device (e.g., bolts).

[0076] The battery pack 100 may also include an intermediate busbar. Due to the intermediate busbar, multiple battery cell modules 120 can be connected in series, and the battery pack 100 can output a high voltage.

[0077] The battery pack 100 may also include electronic components. The electronic components may be disposed within the battery pack housing 110. The electronic components may be located between a plurality of battery cell assemblies 120 and one of the sidewalls 112, 113, 114 and 115 on which venting devices are mounted.

[0078] For example, the electronic components may include a battery management system (BMS). The BMS may be configured to monitor, balance, and control the battery pack 100. Monitoring the battery pack 100 may include measuring the voltage and current at certain nodes in the plurality of individual battery 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 voltage, current, and temperature as described above.

[0079] Balancing the battery pack 100 is an operation to reduce deviations between the multiple battery cell assemblies 120. Control of the battery pack 100 includes prevention of overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack 100 can operate under optimal conditions to prevent shortening of the lifespan of each of the multiple battery cell assemblies 120.

[0080] Electronic components may also include cooling devices, power relay assemblies (PRAs), safety plugs, etc. Cooling devices may include cooling fans. Cooling fans circulate air within the battery pack 100 to prevent overheating of each of the multiple battery cell assemblies 120. The PRA can be configured to supply power from the high-voltage battery to an external load (e.g., a vehicle's motor) or to disconnect power. In the event of an abnormal voltage such as a voltage surge, the PRA can disconnect power to the external load (e.g., the vehicle's motor) to protect both the multiple battery cell assemblies 120 and the external load.

[0081] The present disclosure has been described in more detail above with reference to the accompanying drawings and embodiments. However, the configurations shown in the drawings or embodiments described in this specification are merely examples of the present disclosure and do not reflect all the technical concepts of the present disclosure. Therefore, it should be understood that various equivalents and modifications have been made to replace the configurations as of the filing date of this application.

Claims

1. A method for manufacturing a battery pack, comprising: Prepare the battery pack casing, including the base plate, side walls, and crossbeams; The lifting strap is assembled to the battery pack housing; as well as The individual battery cells are installed in the battery pack housing.

2. The method according to claim 1, wherein, The battery pack housing also includes guide pins located on the crossbeam. The lifting band includes holes, and A portion of the hole in the lifting band is penetrated by the guide pin.

3. The method according to claim 1, wherein, The step of installing the battery cell assembly in the battery pack housing includes: fastening the battery cell assembly and the lifting strap together by bolt connection.

4. A housing-ribbon assembly, comprising: A battery pack housing, the battery pack housing including a base plate, side walls, and a first crossbeam and a second crossbeam; as well as The lifting strap is located between the first crossbeam and the second crossbeam. The lifting strap includes: a lifting portion extending in a first direction parallel to the mounting surface of the base plate; an extension portion connected to the lifting portion and having a width greater than that of the lifting portion in a second direction perpendicular to the first direction; a vertical portion connected to the extension portion and perpendicular to the lifting portion; and a connecting portion protruding from the vertical portion in the first direction.

5. The housing-belt assembly according to claim 4, wherein, The vertical portion faces the first crossbeam.

6. The housing-belt assembly according to claim 4, wherein, The joint overlaps with the first crossbeam in a third direction perpendicular to each of the first and second directions.

7. The housing-belt assembly according to claim 4, wherein, The joint includes a hole.

8. The housing-belt assembly according to claim 7, wherein, The battery pack housing includes a guide pin embedded in the first crossbeam and passing through the hole.

9. A battery pack, comprising: A battery pack housing, the battery pack housing including a base plate and a first crossbeam and a second crossbeam located on the base plate, wherein the first crossbeam and the second crossbeam are spaced apart from each other in a first direction and extend in a second direction perpendicular to the first direction; A battery cell assembly, disposed between a first crossbeam and a second crossbeam, comprising a plurality of battery cells arranged in a first direction and a first side beam and a second side beam spaced apart from each other, the plurality of battery cells being located between the first side beam and the second side beam; and A lifting strap is located between the battery cell assembly and the base plate.

10. The battery pack according to claim 9, wherein, The lifting strap includes a first fastening part located between the first side beam and the first cross beam, and a second fastening part located between the second side beam and the second cross beam.

11. The battery pack according to claim 10, wherein, The first fastening part includes a hole.

12. The battery pack according to claim 11, wherein, The battery pack housing also includes a first guide pin embedded in the first crossbeam and passing through one of the holes.

13. The battery pack according to claim 11, wherein, The battery cell assembly also includes a fixing device that passes through the hole and secures the lifting strap and the first side beam together.

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