Battery pack system with end plate for dispersing internal pressure

Abstract

This disclosure relates to a battery pack system comprising multiple battery modules having stacked battery cells. The multiple battery modules are secured to multiple seating portions within a battery housing. The housing includes a base plate forming its bottom surface, and multiple transverse members projecting upward from the base plate and extending parallel to each other. A set of longitudinal members intersects these transverse members, thereby forming defined seating portions. Two end plates are connected to these transverse members, thereby forming parallel sidewalls. The distance between the mutually facing pressing surfaces of the end plates is precisely adjusted and fixed.

Description

[0001] Cross-citation of related applications

[0002] This application claims priority to Korean Patent Application No. 10-2024-0189064, filed with the Korean Intellectual Property Office on December 17, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a battery pack system having end plates for dispersing internal pressure, and more specifically, to a battery pack system configured such that surface pressure is uniformly applied to battery modules arranged in a high-density battery housing. Background Technology

[0004] Battery pack systems are widely used in various fields such as electric vehicles, energy storage systems (ESS), and home appliances.

[0005] Traditional battery pack systems can be classified by their connecting units, such as battery modules, battery arrays, and battery cells.

[0006] Each battery cell is typically formed in the shape of a plate.

[0007] The battery cells are stacked in a wide-area contact manner to form a predetermined number of battery cells.

[0008] Battery cells can be assembled in a stacked structure and tightly packaged to achieve high energy density per unit area.

[0009] However, to achieve high energy density within a limited space, careful analysis of thermal expansion, shock, vibration, and load between battery cells is necessary. Each battery module and battery system must be designed based on the results of this analysis.

[0010] Battery systems are constantly being charged and discharged due to their nature. This causes each battery cell to undergo micro-expansion and contraction.

[0011] In addition, due to repeated charging and discharging, the numerous battery modules integrated into the battery casing undergo physical and chemical changes as well as aging.

[0012] It is natural for some battery modules to degrade as they are repeatedly charged and discharged and used over time.

[0013] Therefore, it is necessary to propose technologies to design more stable and longer-lasting battery pack structures by solving these problems. Summary of the Invention

[0014] The purpose of this disclosure is to address a conventional problem, namely, the reduced physical lifespan of a battery pack system due to the concentration of forces that connect and secure the battery cells and / or battery modules within a portion of the battery pack system.

[0015] Another objective of this disclosure is to address the conventional problem that, in order to increase the internal durability of the battery casing, the battery casing is designed with a complex and difficult-to-manufacture structure, or additional devices are required to provide additional durability.

[0016] Another objective of this disclosure is to address the conventional problem that the maintenance and repair of battery modules connected in a complex structure requires a complex and time-consuming process of disconnecting and reconnecting the individual battery modules.

[0017] Therefore, the lifespan of the battery pack system can be significantly extended if the pressure can be evenly distributed on the surface of each battery module installed in the battery housing, if stress concentration can be prevented in some areas, or if the temperature of each battery cell can be easily controlled by the structure to prevent heat generation.

[0018] The purpose of this disclosure is not limited to the foregoing purposes, and other unmentioned purposes should be clearly understood from the following description.

[0019] A battery pack system according to an embodiment of the present disclosure includes a battery module, a battery housing, a base plate, a transverse member, a longitudinal member, and an end plate.

[0020] The battery module may include multiple battery cells connected in a multi-layer stacked structure. A mounting portion with a predetermined size may be provided in the battery housing, and the battery module may be mounted in each mounting portion. A base plate may form the bottom surface of the battery housing, and the base plate may be a plate-like member. Multiple transverse members may be arranged parallel to each other, serving as separators projecting vertically upwards along the upper surface of the base plate. Multiple longitudinal members may intersect with the transverse members, forming multiple grid-like mounting portions as separators projecting vertically upwards along the upper surface of the base plate. A pair of end plates may be connected to the two ends of the transverse members to form two parallel sidewalls, and the distance between the pressing surfaces facing each other at the two ends of the transverse members may be adjusted and fixed.

[0021] In a battery pack system according to an embodiment of the present disclosure, the battery housing may include: a pair of sidewall portions, which are wall structures configured to be joined and separated along two side ends of a base plate; and mounting ends, extending outward from each sidewall portion and having at least one extension coupling seat.

[0022] Alternatively, in a battery pack system according to an embodiment of the present disclosure, a pair of end plates may be respectively mounted inside a pair of sidewall portions, and each end plate may be spaced apart from an adjacent corresponding sidewall portion of the pair of sidewall portions by a predetermined distance.

[0023] In a battery pack system according to an embodiment of the present disclosure, each end plate may include a guide groove into which at least a portion of one end of each transverse member is inserted to intersect vertically, and the guide groove may be formed at a position vertically corresponding to the end of each transverse member.

[0024] Alternatively, in a battery pack system according to an embodiment of the present disclosure, each end plate may include an exposed surface opposite to the pressing surface and a plurality of protruding ribs projecting from the exposed surface in a normal direction, the exposed surface being arranged toward the side opposite to the seat, and the protruding ribs being arranged in a transverse direction.

[0025] In a battery pack system according to an embodiment of the present disclosure, each end plate may include a plate-shaped connector that protrudes horizontally from an exposed surface in a normal direction along the upper end of each guide slot to have a predetermined area, and each end plate may have a greater length in the vertical direction than the transverse member, such that its upper end is formed higher, and each guide slot opens toward the lower part of the end plate.

[0026] Alternatively, in a battery pack system according to an embodiment of the present disclosure, each lateral member may include an intersecting end, a guiding surface, and at least one vertical connecting hole disposed in the guiding surface, the intersecting end being formed to have a lower constant height in a predetermined region at each of its two ends, and the guiding surface being formed as a flat upper surface at the intersecting end.

[0027] In a battery pack system according to an embodiment of the present disclosure, the shape and size of the guide groove can be configured to correspond to the intersecting end, the intersecting end extending through the guide groove and orthogonal to the end plate, the plate-shaped connector may include a corresponding connecting hole, which is a through hole formed above the vertical connecting hole, the vertical connecting hole and the corresponding connecting hole are arranged vertically, and the battery pack system may also include a vertical connecting member extending through the corresponding connecting hole and the vertical connecting hole to connect the corresponding connecting hole and the vertical connecting hole to each other.

[0028] Alternatively, in a battery pack system according to an embodiment of the present disclosure, the corresponding connection hole is formed as an elongated hole extending in the longitudinal direction of the plurality of said transverse members and having a predetermined length.

[0029] In a battery pack system according to an embodiment of the present disclosure, the intersecting end may include a protective member that extends upward while wrapping around at least a portion of the outer periphery of an end of a guide surface, and the intersecting end also includes a pressing end that is connected to both sides of the protective member and has an edge that is formed perpendicular to the exposed surface of the end plate along the two side ends of the guide surface.

[0030] Alternatively, in a battery pack system according to an embodiment of the present disclosure, the plurality of protruding ribs may further include a reinforcing surface configured to connect the ends of at least two protruding ribs in a vertical direction.

[0031] In a battery pack system according to an embodiment of the present disclosure, a plurality of protruding ribs may protrude in the normal direction of the exposed surface to have a predetermined shape pattern.

[0032] Alternatively, in a battery pack system according to an embodiment of this disclosure, multiple protruding ribs may protrude from the exposed surface at least two different heights.

[0033] In a battery pack system according to an embodiment of the present disclosure, the plurality of protruding ribs may have at least two different thicknesses. Attached Figure Description

[0034] The above and other features of this disclosure will now be described in detail with reference to certain embodiments of this disclosure illustrated in the accompanying drawings. In this description, the drawings are given by way of illustration only and therefore do not limit the scope of this disclosure. In the drawings:

[0035] Figure 1 This is a view showing the structure used to fix multiple battery modules in a conventional battery pack system;

[0036] Figure 2 This is a cross-sectional view showing the internal structure of a battery pack system according to an embodiment of the present disclosure;

[0037] Figure 3 This is a partial cross-sectional view showing the structure of the battery module connected to the mounting portion in a battery pack system according to an embodiment of the present disclosure;

[0038] Figure 4 This is a front view of an end plate configured to apply surface pressure in a battery pack system according to an embodiment of the present disclosure.

[0039] Figure 5 This is a partial cross-sectional view showing the structure of an end plate connected to the end of a transverse member in a battery pack system according to an embodiment of the present disclosure, the transverse member forming a plurality of seating portions together with a longitudinal member;

[0040] Figure 6 and Figure 7This is a state view showing the process of assembling end plates along one side end of each of a plurality of transverse members in a battery pack system according to an embodiment of the present disclosure.

[0041] Figure 8 This is a schematic diagram illustrating the structure of an end plate connected to the end of each transverse member in a battery pack system according to an embodiment of the present disclosure; and

[0042] Figure 9 This is a partial perspective view showing the connection between the end of the transverse member and the end plate in a battery pack system according to another embodiment of the present disclosure. Detailed Implementation

[0043] The embodiments disclosed herein will be described in detail below with reference to the accompanying drawings.

[0044] Identical or similar parts are indicated by identical or similar reference numerals, and redundant descriptions may be omitted.

[0045] When a component is referred to as a “connection” or “link” to another component, the component may be directly connected to or linked to the other component or there may be other components in between.

[0046] On the other hand, when a component is described as "directly connected" or "directly coupled" to another component, it means that there are no other components in between.

[0047] In this specification, the terms "comprising" or "having" mean that the features, steps, operations, components, parts, or combinations thereof described herein are present, without excluding any one of them.

[0048] When a part, component, unit, device, element, etc. of this disclosure is described as having a purpose or performing an operation or function, such part, component, unit, device, or element shall be regarded herein as "configured to" satisfy the said purpose or perform the said operation or function.

[0049] The first direction (X-axis), the second direction (Y-axis), and the third direction (Z-axis) described in this paper are used to describe solid shapes in three-dimensional space and are orthogonal to each other.

[0050] Figure 1 This is a view showing the structure for fixing multiple battery modules 20 in a conventional battery pack system.

[0051] like Figure 1 As shown, the battery module 20 includes a plurality of battery cells 10. The battery cells 10 are typically flat, plate-like structures that are stacked and connected to each other. The connection unit comprising the plurality of battery cells 10 connected in a stacked structure is referred to as the battery module 20.

[0052] A battery pack system refers to the close installation of multiple battery modules 20 in a predetermined space.

[0053] The battery module 20 can be received in a predetermined space, such as the space between or within the base structure 40 and the fixing member 50. Alternatively, the battery module 20 can be fixed by applying external force to the pressing member 60.

[0054] However, as shown in the figure, the structure of a conventional battery pack system results in an uneven distribution of physical forces applied to the battery module 20 and the battery cell 10.

[0055] Therefore, there are often small gaps between parts of the battery module 20 or battery cell 10, and some areas are subjected to higher pressure than the surrounding areas, resulting in reduced efficiency of the battery pack.

[0056] This disclosure relates to a battery pack system having an end plate 500 for dispersing internal pressure.

[0057] In the embodiments of this disclosure, multiple battery modules 20, comprising multiple battery cells 10 connected in a stacked structure, are received, and surface pressure is distributed to firmly and stably support the battery modules 20. The battery pack system according to embodiments of this disclosure includes a battery housing 30, in which the battery modules 20 can be seated with high energy density. Sealing portions 32 are formed in the battery housing 30 to hold the battery modules 20 in a grid-like arrangement.

[0058] The battery module 20 fixed to the seat 32 can receive surface pressure that is evenly distributed inward from both ends of the end plate 500.

[0059] Figure 2 This is a cross-sectional view showing the internal structure of a battery pack system according to an embodiment of the present disclosure. Figure 3 This is a partial cross-sectional view showing the structure of the battery module 20 connected to the mounting portion 32 in a battery pack system according to an embodiment of the present disclosure.

[0060] like Figure 2 and Figure 3 As shown, the battery pack system according to an embodiment of the present disclosure includes a battery module 20, a battery housing 30, a base plate 100, a transverse member 200, a longitudinal member 300, and an end plate 500.

[0061] The battery module 20 is a unit structure that connects multiple battery cells 10 in series or in parallel and is designed to have a predetermined voltage and capacity.

[0062] The battery cell 10 is a basic unit for storing electrochemical energy. The battery cell 10 can be implemented in various forms, such as a lithium-ion battery or a lithium polymer battery.

[0063] Each battery cell 10 has specific standards, voltage, and capacity. The battery cell 10 typically has a structure in which the positive electrode, negative electrode, electrolyte, and spacer are received in an aluminum or steel plate casing.

[0064] The battery module 20 is composed of stacked battery cells 10, so as to have multiple layers. Insulators or buffer pads are inserted between each battery cell 10 to protect the battery cell 10 from electrical short circuits or shocks.

[0065] Alternatively, a separate housing or frame structure can be attached to the outside of the battery module 20.

[0066] As shown in the figure, the battery casing 30 has a partition structure in which a plurality of partitioned seating portions 32 are formed.

[0067] The base plate 100 forms the bottom surface of the lower end of the battery housing 30. The base plate 100 is a plate-like structure disposed on the flat surface of the lower end of the battery housing 30 to support the components mounted thereon.

[0068] The transverse member 200 and the longitudinal member 300 are mounted on the upper surface of the base plate 100.

[0069] The transverse member 200 and the longitudinal member 300 protrude vertically upward from the upper surface of the base plate 100 to separate the space.

[0070] Multiple transverse members 200 are arranged in parallel on the upper surface of the base plate 100, and multiple longitudinal members 300 that intersect the transverse members 200 perpendicularly are arranged in parallel on the upper surface of the base plate 100.

[0071] Multiple transverse members 200 and multiple longitudinal members 300 intersect each other to form a grid-like seating portion 32 that occupies most of the upper surface of the base plate 100.

[0072] Each seating portion 32 is a space formed by the upper surface of the base plate 100 forming the bottom surface, a pair of transverse members 200 and a pair of longitudinal members 300 forming four side walls, and the battery module 20 is received and installed in this space.

[0073] Each of the transverse member 200 and the longitudinal member 300 may be made of metal or rigid composite plastic to withstand impact or vibration.

[0074] The longitudinal member 300 can be divided into a fixed unit 310 that is durable and resistant to external forces and a functional unit 320 that is manufactured to facilitate assembly or perform a predetermined function.

[0075] Multiple mounting portions 32 of predetermined sizes are disposed in the battery housing 30. A battery module 20 is mounted in each mounting portion 32, and the battery module 20 connected to each mounting portion 32 is arranged such that the stacked surfaces of the battery cells 10 disposed in the battery module are oriented in a specific direction.

[0076] It may also be provided with a first sidewall portion 110 and a second sidewall portion 120 forming two side surfaces of the battery housing 30 along the two side ends of the base plate 100.

[0077] The first sidewall portion 110 and the second sidewall portion 120 can be connected to the base plate 100 on both sides of the battery casing 30, and can also be separated from the base plate.

[0078] The first sidewall portion 110 and the second sidewall portion 120 may include a first mounting end 112 and / or a second mounting end 122 having a predetermined shape and size.

[0079] The first mounting end 112 and / or the second mounting end 122 may be provided with at least one extension connector.

[0080] The extension connectors provided on the first mounting end 112 and / or the second mounting end 122 can be fastened to individual external structures, vehicle chassis, etc.

[0081] In addition, the battery housing 30 may also include a link module 34 configured to transmit electrical energy, refrigerant or data to the outside (i.e., outside the vehicle) and to receive electrical energy, refrigerant or data from the outside (i.e., outside the vehicle).

[0082] A pair of end plates 500 are respectively disposed inside the first side wall portion 110 and the second side wall portion 120.

[0083] End plate 500 can be connected to both ends of transverse member 200. End plate 500 stably fixes both ends of multiple transverse members 200.

[0084] The end plate 500 may have flat pressing surfaces 510 formed on two inner surfaces facing each other.

[0085] Thus, by adjusting and fixing the distance between the pressing surfaces 510 (flat surfaces facing each other), multiple battery modules 20 arranged therebetween can be fixed with constant surface pressure.

[0086] The end plate 500 can be installed inside the first side wall portion 110 and the second side wall portion 120 respectively, and a predetermined distance can be formed between each of the side wall portions 110 and 120 and the corresponding end plate 500.

[0087] The spaces formed between one end plate 500 and the first sidewall portion 110 and between the other end plate 500 and the second sidewall portion 120 are provided for flexible response to micro-deformation of the battery cell 10 or battery module 20, manufacturing dimensional deviations, thermal expansion due to charging and discharging, etc.

[0088] Figure 4 This is a front view of an end plate 500 configured to apply surface pressure in a battery pack system according to an embodiment of the present disclosure. Figure 5 This is a partial cross-sectional view showing the structure of an end plate 500 connected to the end of a transverse member 200 in a battery pack system according to an embodiment of the present disclosure, the transverse member forming a plurality of seating portions 32 together with a longitudinal member 300. Figure 6 and Figure 7 This is a state view showing the process of assembling an end plate 500 along one side end of each of a plurality of transverse members 200 in a battery pack system according to an embodiment of the present disclosure.

[0089] like Figures 4 to 7 As shown, each end plate 500 can be made of high-rigidity and deformation-resistant metal or composite material.

[0090] Each end plate 500 is a plate-shaped member with a large area along the YZ plane. The end plate 500 includes a pressing surface 510 and an exposed surface 520. The pressing surface is a flat surface, and the exposed surface is the surface opposite to the pressing surface 510 and faces outward relative to the position of the seat 32 (i.e., the exposed surface 520 faces away from the seat 32).

[0091] A plurality of guide slots 540 are formed in the end plate 500. Each guide slot 540 is shaped to allow at least a portion of one end of the corresponding transverse member 200 to extend through it in the vertical direction.

[0092] The number, position, and spacing of the guide grooves 540 can be determined based on the number of transverse members 200 provided in the embodiments of this disclosure and the positions of the two sides of the transverse members when viewed from the vertical direction.

[0093] The guide groove 540 can be an open space in the form of a groove with two sidewalls and a top surface, formed as a downward-facing structure that opens from the lower end of the end plate 500.

[0094] The exposed surface 520 of the end plate 500 may be provided with multiple protruding ribs 530.

[0095] Each protruding rib 530 can be configured as a transversely oriented straight reinforcing plate protruding from the exposed surface 520 in the normal direction (i.e., perpendicular to the exposed surface 520).

[0096] As shown in the figure, multiple protruding ribs 530 can be formed parallel to each other in the transverse direction on the exposed surface 520, and in the area where the guide groove 540 is formed in the end plate 500, some of the protruding ribs 530 can be omitted.

[0097] Multiple protruding ribs 530 protruding from the exposed surface 520 of the end plate 500 can be configured to increase the structural stiffness of the end plate 500 and quickly dissipate internal heat.

[0098] The guide groove 540 is a slot-shaped opening formed in the end plate 500, and allows the intersecting end 230 formed at the end of the transverse member 200 to be vertically inserted and extended through the guide groove.

[0099] The transverse member 200 has a connecting groove 210 formed for cross-connection with the longitudinal member 300 and a pair of intersecting ends 230 formed at both ends.

[0100] Intersecting ends 230 are formed at the ends of the transverse members 200, and each intersecting end 230 includes a region with a uniformly lower height.

[0101] In embodiments of this disclosure, the end plate 500 is higher than the transverse member 200, such that the upper end of each end plate 500 is arranged higher than the transverse member 200.

[0102] Each intersecting end 230 disposed on the transverse member extends vertically through a corresponding guide groove in a guide groove 540 formed in the end plate 500 to connect to the end plate.

[0103] The intersecting end 230 may have a rectangular cross-section, and its uniformly lower upper surface is a flat guide surface 232 in which at least one vertical connecting hole 234 may be formed.

[0104] Alternatively, according to the embodiments to which this disclosure is applied, the guide surface 232 may be provided with a plurality of vertical connecting holes 234 formed at predetermined intervals in the longitudinal direction.

[0105] Each guide groove 540 formed in the end plate 500 is provided with a plate-shaped connector 542, which is a plate-shaped member that protrudes forward from the upper end of the exposed surface 520. The plate-shaped connector 542 can abut against the upper part of the guide surface 232 formed at its corresponding intersecting end 230 of the transverse member 200.

[0106] The plate-shaped connector 542 may be provided with at least one corresponding connecting hole 544, and the corresponding connecting hole 544 and the vertical connecting hole 234 may be oriented and aligned in the vertical direction (i.e., vertically) so that their positions are fixed by the vertical fastening member 600. In other words, at least one corresponding connecting hole 544 and the vertical connecting hole 234 are vertically aligned.

[0107] The vertical connecting hole 234 formed in the guide surface 232 may also be provided with a blind nut made of a highly elastic material to increase the fixing force applied to the outer periphery of the fastening pin 620 of the vertical fastening member 600.

[0108] The vertical fastening member 600 has a wide fastening head 610 that presses down on the upper surface of the plate-shaped connector 542, so that the lower surface of the plate-shaped connector 542 and the guide surface 232 are firmly fixed in abutting position.

[0109] Figure 8 This is a schematic diagram showing the structure in a battery pack system according to an embodiment of the present disclosure, in which an end plate 500 is connected to the end of each transverse member 200.

[0110] like Figure 8 As shown, in the battery pack system according to an embodiment of the present disclosure, the corresponding connection hole 544 of the plate-shaped connector 542 provided at the upper end of each guide groove 540 that is open in one direction can be formed as an elongated hole (or a short groove).

[0111] In this case, the longitudinal direction of the corresponding connection hole 544 can be parallel to the normal direction of the pressing surface 510 provided on the end plate 500.

[0112] The corresponding connection hole 544 with a predetermined length resists possible expansion or deformation through the battery module 20, and the end plate 500 and the intersecting end 230 are fixed in position to slide in the lateral direction to prevent large pressure from being applied to the specific battery module 20 or battery cell 10.

[0113] Furthermore, as shown in the figure, the multiple protruding ribs 530 formed on the exposed surface 520 may have the same length (height), but the ends of at least two protruding ribs 530 may be connected to each other as a reinforcing surface to increase the structural stiffness.

[0114] Each of the plurality of protruding ribs 530 may be formed such that the plurality of protruding ribs have at least two different lengths (heights) protruding from the exposed surface 520, and the protruding ribs 530 may be formed to have at least two different thicknesses.

[0115] Alternatively, the protruding ribs 530 may be formed on the exposed surface 520 in a manner that protrudes in accordance with a series of patterns (such as predetermined shapes).

[0116] According to the embodiments to which this disclosure is applied, each protruding rib 530 formed on the exposed surface 520 may be configured such that the central portion 502 and the two side portions 504 have different heights or thicknesses.

[0117] Figure 9 This is a partial perspective view showing the connection between the end of the transverse member 200 and the end plate 500 in a battery pack system according to another embodiment of the present disclosure.

[0118] like Figure 9 As shown, in a battery pack system according to another embodiment of the present disclosure, the intersecting ends 230 formed on each transverse member 200 may also be provided with plate-shaped protective members 240 extending upward from the end of their guide surface 232.

[0119] The protective member 240 can extend upward from the end of the guide surface 232 to physically protect the vertical fastening member 600 fastened to the plate-shaped connector 542 from the outside.

[0120] In addition, plate-shaped members extending from both sides of the protective member 240 along the two side ends of the guide surface 232 can also be provided.

[0121] A plate-like member formed along each of the two sides of the guide surface 232 and extending from the protector 240 may be configured as a press end 242 having an end edge that extends in the vertical direction and faces directly toward the exposed surface 520.

[0122] In this case, the guide surface 232 can be formed between the pressing end 242 and the transverse member 200 at a predetermined distance, and the end plate 500 can be assembled such that when the two ends connected to the plurality of transverse members 200 and the areas in which the intersecting ends 230 and the guide surface 232 are formed, as well as the guide groove 540, intersect each other vertically, the end plate 500 moves downward from above.

[0123] According to this disclosure, by dispersing the pressure applied to the battery module or battery cell connected to the battery housing, the pressure can be applied evenly to the battery module or battery cell, thereby extending the life of the battery pack system.

[0124] According to this disclosure, uniform surface pressure can be applied to the battery module without adding additional components or manufacturing processes to the battery casing, which can shorten the manufacturing cycle and reduce production costs.

[0125] According to this disclosure, a pair of end plates has a structure that can press multiple battery modules arranged therebetween with a distributed force, while allowing sufficient space in the battery housing to accommodate external forces or deformation of the battery cells.

[0126] According to this disclosure, the stability of the battery pack system can be further improved by enabling the end plates of the battery cells or battery modules fixed on both sides to move in response to the deformation of some battery cells or battery modules.

[0127] The effects of this disclosure are not limited to those described above, and those skilled in the art should clearly understand from the above description other effects not mentioned in this disclosure.

[0128] Embodiments of this disclosure have been described above with reference to the accompanying drawings. The described embodiments and drawings are given by way of example, and it should be understood that various modifications can be made to this disclosure within the scope of the disclosed technical concept.

[0129] The described embodiments are considered part of this disclosure, and the scope of this disclosure is not limited to the described embodiments.

[0130] The scope of this disclosure is determined by the technical concept described in the claims.

[0131] Even if the described embodiments do not explicitly describe the operation or effect of a particular construction, the operation or effect that can be predicted by the construction is also within the scope of this disclosure.

Claims

1. A battery pack system, comprising: Multiple battery modules, each of the multiple battery modules comprising multiple battery cells connected in a multi-layer stacked structure; A battery housing having a plurality of mounting portions of a predetermined size therein, wherein each of the plurality of battery modules is mounted in a corresponding mounting portion of the plurality of mounting portions; A base plate, configured to form the bottom surface of the battery casing, the base plate being a plate-shaped member; Multiple transverse members are arranged parallel to each other and protrude upward from the upper surface of the base plate; Multiple longitudinal members intersect with multiple transverse members to form multiple seating portions, the multiple longitudinal members being parallel to each other and projecting upward from the upper surface of the base plate; as well as A pair of end plates, adjustablely connected to opposite ends of the plurality of transverse members, the pair of end plates being parallel to each other and having pressing surfaces facing each other, wherein the distance between the pressing surfaces is adjustable.

2. The battery pack system according to claim 1, wherein, The battery casing includes: A pair of sidewall portions, configured to connect and separate along the respective ends of the base plate; and The mounting end extends outward from each of the sidewall portions.

3. The battery pack system according to claim 2, wherein, The pair of end plates are respectively installed between the plurality of battery modules and the pair of sidewall portions, wherein each end plate is spaced apart from its adjacent corresponding sidewall portion of the pair of sidewall portions by a predetermined distance.

4. The battery pack system according to claim 1, wherein, Each of the end plates includes: An exposed surface, opposite to the pressing surface, faces away from the plurality of seating portions; and Multiple protruding ribs protrude from the exposed surface along the normal direction, and the protruding ribs are arranged in the transverse direction relative to the end plate.

5. The battery pack system according to claim 4, wherein, Each of the end plates includes a plate-shaped connector that projects horizontally from the exposed surface along the normal direction, the plate-shaped connector having a predetermined area.

6. The battery pack system according to claim 4, wherein, Each of the end plates includes a guide slot configured to receive at least a portion of one end of one of the plurality of transverse members, and The guide groove is positioned to correspond to one end of the transverse member in the vertical direction.

7. The battery pack system according to claim 6, wherein, Each of the plurality of said transverse members includes: The intersecting ends are formed within a predetermined region at each of the two ends of the transverse member and have a constant height; A guiding surface, wherein the guiding surface is a flat upper surface formed at the intersecting end; and At least one vertical connecting hole is provided in the guide surface.

8. The battery pack system according to claim 7, wherein, The intersecting ends include: A protective element extending upward from the end of the guide surface; and The pressing end is connected to both sides of the protective member and has edges that are formed along the two side ends of the guide surface perpendicular to the exposed surface of the end plate.

9. The battery pack system according to claim 7, wherein, The shape and size of the guide groove are determined to correspond to the intersecting end, which extends through the guide groove and is orthogonal to the end plate.

10. The battery pack system according to claim 6, wherein, Each of the end plates includes a plate-shaped connector extending horizontally along the upper end of each of the guide slots, the plate-shaped connector having a predetermined area.

11. The battery pack system according to claim 10, wherein, The plate-shaped connector includes a corresponding connecting hole, which is a through hole formed above the vertical connecting hole. The vertical connecting hole and the corresponding connecting hole are aligned vertically. The battery pack system also includes a vertical connecting member that extends through the corresponding connecting hole and the vertical connecting hole to connect the corresponding connecting hole and the vertical connecting hole to each other.

12. The battery pack system according to claim 11, wherein, The corresponding connecting hole is formed as an elongated hole of a predetermined length extending in the longitudinal direction of the plurality of transverse members.

13. The battery pack system according to claim 6, wherein, Each of the end plates is higher in the vertical direction than the height of the plurality of transverse members, such that the upper end of the end plate is formed to be higher, and the guide groove is open toward the lower portion of the end plate.

14. The battery pack system according to claim 4, wherein, The plurality of protruding ribs also include reinforcing surfaces configured to connect the ends of at least two of the protruding ribs in a vertical direction.

15. The battery pack system according to claim 4, wherein, The plurality of the protruding ribs protrude in the normal direction of the exposed surface to have a predetermined shape pattern.

16. The battery pack system according to claim 4, wherein, The protruding ribs protrude from the exposed surface at at least two different heights.

17. The battery pack system according to claim 4, wherein, The plurality of the protruding ribs have at least two different thicknesses.

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