Power battery system and vehicle

Abstract

The present application belongs to the technical field of power batteries. Disclosed is a power battery system, comprising a battery box, a battery module, and a bearing structure. A top wall of the battery box is provided with at least one frame groove having two ends penetrating therethrough. The battery box is internally provided with an accommodating space. The at least one frame groove divides the accommodating space into at least two first spaces and at least one second space that are in communication with one another. For each frame groove, the two ends of the frame groove are connected, corresponding first spaces are respectively distributed on both sides in the width direction of the groove, and corresponding second spaces are distributed on one side of the frame groove in the depth direction of the groove. The battery module comprises at least one first battery module and at least one second battery module. A corresponding first battery module is provided in each first space, and a corresponding second battery module is provided in each second space. The bearing structure is located in the first space and the second space, and the bearing structure supports and blocks the at least one first battery module and the at least one second battery module.

Description

Power battery system and vehicle

[0001] The present application claims priority to the Chinese patent application No. 202410862455.8, filed on June 28, 2024, to the Chinese Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of power battery, for example, to a power battery system and a vehicle. BACKGROUND

[0003] In recent years, various battery structure innovation technologies of de-modularization and integration have been introduced in the field of power batteries and gradually applied.

[0004] At present, the mainstream scheme in commercial vehicles often adopts industry standard packs to construct a power battery system. For example, for new energy pure electric traction, when matching an nkWh power battery system, 6 sets of n / 6kWh or 4 sets of n / 4kWh industry standard packs are often used, which are hung behind the cab or on the side of the chassis, and are centrally placed. The standard packs are connected in series and parallel to form a group to meet the electric power configuration requirements of the vehicle. However, the industry standard packs are limited by the structure, and from the perspective of structural innovation, they cannot meet the requirement of higher specific energy of the system. For example, the lightweight degree of the power battery system itself and the vehicle needs to be further improved, and the space utilization of the system itself and the vehicle is limited, and the integration degree of the vehicle is not high. SUMMARY

[0005] The purpose of the present application is to provide a power battery system and a vehicle.

[0006] The present application adopts the following technical solutions:

[0007] The power battery system comprises:

[0008] A battery box, the battery box has an accommodation space inside, the top wall of the battery box is provided with at least one frame slot penetrating through both ends, the at least one frame slot divides the accommodation space into at least two first spaces and at least one second space in communication, for each frame slot, the frame slot penetrates through both ends, and corresponding first spaces are distributed on both sides of the frame slot in the slot width direction, and corresponding second spaces are distributed on one side of the frame slot in the slot depth direction;

[0009] A battery module, the battery module comprises at least one first battery module and at least one second battery module, each first space is provided with a corresponding first battery module, and each second space is provided with a corresponding second battery module; and

[0010] A force bearing structure is arranged in the accommodation space, and the force bearing structure limits the at least one first battery module and the at least one second battery module.

[0011] Optionally, the battery box comprises a first half shell and a second half shell, the first half shell and the second half shell are buckled to each other to form the accommodation space, and the first half shell comprises a concave-convex structure plate having at least one concave structure and at least two convex structures arranged alternately.

[0012] For each concave structure, two sides of the concave structure have corresponding convex structures respectively, the concave structure is concave in a direction of the first half shell pointing to the second half shell, and the concave structure and the second half shell have a corresponding second space, and the vehicle frame slot is arranged in the concave structure.

[0013] For each convex structure, the convex structure is convex in a direction of the second half shell pointing to the first half shell, and the convex structure and the second half shell have a corresponding first space.

[0014] Optionally, the second half shell comprises an inner plate and an outer skin, the inner plate is opposite to the concave-convex structure plate, the outer skin is located on a side of the inner plate away from the concave-convex structure plate, and the outer skin and the inner plate are spaced to form a hollow layer therebetween.

[0015] Optionally, the first half shell is integrally bent and formed from a plate material.

[0016] Optionally, the first half shell further comprises two first side plates, the at least one concave structure and the at least two convex structures are alternately concave and convex in a first direction, and the two first side plates are arranged opposite to each other at two ends of the concave-convex structure plate in the first direction.

[0017] The second half shell comprises a bottom plate and two second side plates, the two second side plates are arranged opposite to each other at two ends of the bottom plate in a second direction, and the first direction is perpendicular to the second direction.

[0018] Two ends of the concave-convex structure plate in the second direction are respectively connected to the two second side plates, two ends of the bottom plate in the first direction are respectively connected to the two first side plates, and each first side plate is connected to a corresponding second side plate.

[0019] Optionally, each first battery module comprises two layers of first battery groups stacked in an up-down direction, the second battery module comprises one second battery group, and the two layers of first battery groups and the second battery group each comprise at least one battery cluster, and each battery cluster comprises a plurality of batteries.

[0020] Optionally, the load-bearing structure includes a bottom frame, a top frame, and a plurality of vertical frames arranged at intervals in the horizontal direction. The bottom frame and the plurality of vertical frames are both arranged at the bottom of the battery box. The top frame is arranged on the plurality of vertical frames and is spaced up and down from the bottom frame. Each second battery pack and each first battery pack in the lower layer are both arranged between the bottom frame and the top frame and are both blocked by the adjacent vertical frames. Each first battery pack in the upper layer is arranged on the side of the top frame背离 the bottom frame.

[0021] Optionally, the load-bearing structure includes a plurality of cross bars and a plurality of longitudinal bars. The bottom frame is formed by horizontally and vertically intersecting connection of some cross bars and some longitudinal bars. The top frame is formed by horizontally and vertically intersecting connection of another part of cross bars and another part of longitudinal bars.

[0022] Optionally, the material of the load-bearing structure is CP820 / 1180DP.

[0023] Optionally, the two layers of first battery packs include the at least one battery cluster and at least two liquid cooling components arranged alternately in the third direction. Each side of each battery cluster has a corresponding liquid cooling component. Each battery cluster is composed of a plurality of batteries stacked in the thickness direction of the battery. The thickness direction of the battery, the third direction, and the stacking direction of the two layers of first battery packs are perpendicular to each other in pairs.

[0024] Optionally, the two layers of first battery packs further include a bracket. Each battery cluster is arranged on the bracket. The bracket includes a plurality of longitudinal beams and a plurality of cross beams that are cross-connected. The cross-sections of the plurality of longitudinal beams and the plurality of cross beams are both in a "channel" shape.

[0025] Optionally, an insulating coating is provided on the surface of each battery and is bonded to the bracket.

[0026] Optionally, along the groove width direction of the at least one vehicle frame groove, two vehicle frame grooves are spacedly provided on the top wall of the battery box. The accommodation space includes three first spaces. The three first spaces and the two vehicle frame grooves are alternately distributed along the groove width direction of the vehicle frame groove.

[0027] Optionally, a first connection part is provided outside the top wall of the battery box, and a second connection part is provided outside the bottom wall of the battery box.

[0028] A vehicle includes a vehicle frame and the above-mentioned power battery system. The vehicle frame is located in the at least one vehicle frame groove. Description of the Drawings

[0029] FIG. 1 is a schematic structural diagram of the power battery system provided in the embodiment of the present application when arranged on a vehicle frame;

[0030] FIG. 2 is an exploded schematic diagram of the power battery system provided in the embodiment of the present application;

[0031] Fig. 3 is a structural schematic diagram of a force bearing structure according to an embodiment of the present application;

[0032] Fig. 4 is a structural schematic diagram of a first battery pack according to an embodiment of the present application;

[0033] Fig. 5 is an exploded schematic diagram of the first battery pack according to an embodiment of the present application. 100, battery box; 110, frame slot; 120, first space; 130, second space; 200, first half shell; 210, concave-convex structure plate; 211, concave structure; 212, convex structure; 220, first side plate; 230, first connecting part; 300, second half shell; 310, inner plate; 320, outer skin; 330, bottom plate; 340, second side plate; 410, first battery pack; 411, battery cluster; 412, liquid cooling member; 413, bracket; 4131, longitudinal beam; 4132, transverse beam; 414, current collecting pipe; 420, second battery pack; 500, force bearing structure; 510, underframe; 5101, transverse bar; 5102, longitudinal bar; 520, stand; 530, roof; 540, connecting frame; 601, main beam. DETAILED DESCRIPTION

[0034] In the description of the present application, unless specifically defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0037] Chinese patent CN117141218B discloses a power battery system, which comprises a plurality of battery unit assemblies and a control circuit assembly, the control circuit assembly is electrically connected with the battery unit assemblies, each battery unit assembly comprises a plurality of battery units arranged in layers, the battery unit comprises a battery unit housing, a battery core, a first electrical connector and a slave controller, the battery unit housing encapsulates the battery core, the first electrical connector and the slave controller. One group of battery unit assemblies is arranged in the middle hollow area of the chassis frame, and the other two groups of battery unit assemblies are symmetrically arranged on both sides of the middle hollow area, at least part of the battery unit assemblies is located below the chassis frame longitudinal beam; the control circuit unit is arranged below the chassis frame longitudinal beam and between the adjacent two groups of battery unit assemblies. The patent combines the power battery system with the frame to a certain extent, which improves the space utilization of the power battery on the chassis.

[0038] In the above-mentioned patent, the encapsulated battery units are stacked and spliced to form a battery unit assembly, and the battery unit assembly is further assembled with a control circuit assembly to form a power battery system. The power battery system is applied to a vehicle, and the lightweight degree of the power battery system and the vehicle needs to be further improved, the space utilization of the power battery system and the vehicle is limited, and the integration degree of the vehicle is not high.

[0039] As shown in FIGS. 1-5, the present embodiment provides a power battery system, which comprises a battery box 100, a battery module and a force bearing structure 500.

[0040] As shown in FIG. 1 and FIG. 2, the top wall of the battery box 100 is provided with at least one frame slot 110 penetrating through both ends, the battery box 100 has an accommodating space inside, the at least one frame slot 110 divides the accommodating space into at least two first spaces 120 and at least one second space 130 in communication, for each frame slot, the frame slot 110 penetrates through both ends, and corresponding first spaces 120 are distributed on both sides of the frame slot 110 in the slot width direction, and corresponding second spaces 130 are distributed on one side of the frame slot 110 in the slot depth direction. In this embodiment, the number of second spaces 130 is equal to and one-to-one corresponds to the number of frame slots 110. The frame slot 110 is used to cooperate with the frame of the vehicle, accommodate the frame of the vehicle, improve the space utilization of the power battery system on the vehicle, improve the integration of the vehicle, and realize the short wheelbase of the vehicle. For example, the frame slot 110 is located outside the accommodating space, and the slot opening faces upward, and the slot depth direction is a downward direction.

[0041] For example, along the slot width direction of the at least one frame slot 110, the top wall of the battery box 100 is provided with two frame slots 110 at intervals, the accommodating space includes three first spaces 120, the three first spaces 120 are alternately distributed along the slot width direction of the two frame slots 110, and the accommodating space includes two second spaces 130, which are both located below the corresponding frame slot 110. The frame includes two main beams 601 arranged side by side along the running direction of the vehicle, and the main beams 601 are cooperatively fitted into the frame slots 110 corresponding thereto.

[0042] The battery module includes at least one first battery module and at least one second battery module, each first space 120 is provided with a corresponding first battery module, and each second space 130 is provided with a corresponding second battery module. In this embodiment, the number of first battery modules is equal to and one-to-one corresponds to the number of first spaces 120, and the first battery modules are located in the corresponding first spaces 120, and the number of second battery modules is equal to and one-to-one corresponds to the number of second spaces 130, and the second battery modules are located in the corresponding second spaces 130. Due to the existence of the frame slot 110, the first space 120 and the second space 130 cannot be kept at the same height, so the first space 120 is filled with a first battery module adapted to the size thereof, and the second space 130 is filled with a second battery module adapted to the size thereof, thereby improving the energy density of the power battery system and the space utilization of the power battery system and the vehicle.

[0043] The force bearing structure 500 is arranged in the accommodating space, and the force bearing structure 500 limits at least one first battery module and at least one second battery module. That is, the force bearing structure 500 is connected and fixed with the battery box 100 in the accommodating space, the force bearing structure 500 limits the battery module, and the battery box 100 cooperates to protect the structure of the entire power battery system.

[0044] The power battery system provided by the embodiment has the battery box 100 designed to have the top wall of the battery box 100 provided with the frame groove 110, and the accommodation space in the battery box 100 is formed into the second space 130 and the first spaces 120 on both sides of the second space 130. The first battery modules and the second battery modules are reasonably arranged in the first spaces 120 and the second space 130. Compared with the background technology, the second battery modules are additionally arranged without changing the overall volume, and the space utilization of the battery box 100 is further improved. Moreover, the battery box 100 protects the first battery modules and the second battery modules, and the bearing structure 500 provides the first battery modules and the second battery modules with the limit in the battery box 100, so that the first battery modules and the second battery modules do not need to have the module shells by themselves, the space utilization in the battery box 100 is further improved, the lightweight degree of the battery box 100 is improved, and the high integration of the vehicle is facilitated.

[0045] As shown in FIGS. 2, 4 and 5, each first battery module includes two layers of first battery groups 410 stacked in an up-down direction, and each second battery module includes one layer of second battery groups 420. Each of the two layers of first battery groups 410 and the second battery group 420 includes at least one battery cluster 411, and each battery cluster 411 includes a plurality of batteries. The first spaces 120 are arranged with the two layers of first battery groups 410, and the second spaces 130 are arranged with the one layer of second battery groups 420. The space utilization is improved, and the space utilization of the power battery system is improved. Moreover, the battery clusters 411 are not different from each other, and the first battery groups 410 and the second battery groups 420 are easily connected in series and in parallel to form the battery module, the electrical connection is convenient, and the consistency of the battery module is high. In the embodiment, the three first spaces 120 are arranged with six first battery groups 410, and the two second spaces 130 are arranged with two second battery groups 420.

[0046] When the two layers of first battery groups 410 or the second battery group 420 include a plurality of battery clusters 411, the battery clusters 411 are arranged side by side in a horizontal direction. In the embodiment, the first battery group 410 includes three battery clusters 411 arranged side by side in the horizontal direction, and the second battery group 420 includes one battery cluster 411. The battery module composed of the six first battery groups 410 and the two second battery groups 420 includes a total of 20 battery clusters 411.

[0047] As shown in FIGS. 1 and 2, the battery box 100 includes a first half shell 200 and a second half shell 300. The first half shell 200 and the second half shell 300 are buckled to each other to form the accommodation space. The first half shell 200 includes a concave-convex structure plate 210 provided with at least one concave structure 211 and at least two convex structures 212 arranged alternately.

[0048] For each recess structure 211, the two sides of the recess structure 211 have corresponding protrusion structures 212 respectively, the recess structure 211 is recessed in the direction of the second half shell 300 from the first half shell 200, the recess structure 211 and the second half shell 300 have corresponding second spaces 130, and the recess structure 211 has corresponding frame grooves 110;

[0049] For each protrusion structure 212, the protrusion structure 212 is protruded in the direction of the first half shell 200 from the second half shell 300, and the protrusion structure 212 and the second half shell 300 have corresponding first spaces 120. In the embodiment, the first spaces 120 correspond to the protrusion structures 212 one by one, and the second spaces 130 and the frame grooves 110 correspond to the recess structures 211 one by one. By the buckling of the first half shell 200 and the second half shell 300, the closed battery box 100 is formed, the battery box 100 has simple structure, the recess structures 211 and the protrusion structures 212 on the concave-convex structure plate 210 form the frame grooves 110, and the containing space in the battery box 100 is divided into the first spaces 120 and the second spaces 130 which are communicated with each other, the containing space still stores the whole battery module as a whole, which is beneficial to improve the space utilization of the power battery system and the vehicle.

[0050] As shown in FIG. 2, optionally, the first half shell 200 further includes two first side plates 220, at least one recess structure 211 and at least two protrusion structures 212 are alternately recessed and protruded in the first direction, and the two first side plates 220 are oppositely arranged at the two ends of the concave-convex structure plate 210 in the first direction;

[0051] The second half shell 300 includes a bottom plate 330 and two second side plates 340, the two second side plates 340 are oppositely arranged at the two ends of the bottom plate 330 in the second direction, and the first direction is perpendicular to the second direction; and

[0052] The two ends of the concave-convex structure plate 210 in the second direction are respectively connected with the two second side plates 340, the two ends of the bottom plate 330 in the first direction are respectively connected with the two first side plates 220, and each first side plate 220 is connected with the corresponding second side plate 340. The first half shell 200 and the second half shell 300 are sealingly connected, which is different from the traditional industry standard package scheme, and the total sealing interface length of the power battery system is shortened. The first half shell 200 has simple structure, no flange and corner, which is different from the non-metallic power battery upper box structure of the traditional phase change material (PCM), sheet molding compound (SMC) and resin transfer molding (RTM), and can be directly formed by bending thin-walled metal material. In the embodiment, the first half shell 200 is integrally formed by bending the plate material, which has low manufacturing cost and high reliability.

[0053] In the embodiment, the first direction is the length direction of the battery box 100, and the second direction is in the width direction of the battery box 100.

[0054] In the embodiment, the walls of the concave structure 211 and the convex structure 212 are horizontal and vertical, so that the first space 120 or the second space 130 has a regular shape (e.g., a box shape), which is conducive to reasonable arrangement of the battery module.

[0055] As shown in FIG. 2, optionally, the second half shell 300 includes an inner plate 310 and an outer skin 320. The inner plate 310 is opposite to the concave-convex structure plate 210, and the outer skin 320 is located on a side of the inner plate 310 away from the concave-convex structure plate 210 and is spaced from the inner plate 310 to form a hollow layer therebetween. The hollow layer can form static air or be filled with a thermal insulation material to isolate the battery adjacent to one side thereof from the air outside the battery box 100, thereby ensuring that the temperature fields of the accommodation spaces on the side of the inner plate 310 and the side of the concave-convex structure plate 210 are substantially consistent, solving the problem of temperature difference between the upper and lower layers of the first battery pack 410 and effectively improving the electrical performance and service life. In the embodiment, the inner plate 310 and the outer skin 320 jointly constitute the bottom plate 330 of the second half shell 300.

[0056] As shown in FIG. 3, the force bearing structure 500 includes a bottom frame 510, a top frame 530, and a plurality of vertical frames 520 arranged in a horizontal direction. The bottom frame 510 and the plurality of vertical frames 520 are arranged at the bottom of the battery box 100, and the top frame 530 is arranged on the plurality of vertical frames 520 and is spaced from the bottom frame 510. Each second battery pack 420 and each first battery pack 410 located in the lower layer are arranged between the bottom frame 510 and the top frame 530 and are stopped by adjacent vertical frames 520. Each first battery pack 410 located in the upper layer is arranged on a side of the top frame 530 away from the bottom frame 510. Unlike the conventional flat and equal-thickness aluminum profile main force bearing structure scheme, the force bearing structure 500 in the embodiment is a three-dimensional interwoven structure, which meets the overall strength and rigidity requirements of the power battery system.

[0057] For example, the bottom of the second battery pack 420 and the first battery pack 410 in the lower layer is supported by the bottom frame 510, the top is stopped by the top frame 530, and the side is stopped by the vertical frame 520, so as to realize reliable fixation of the first battery pack 410 in the lower layer and the second battery pack 420. Moreover, the bottom of the first battery pack 410 in the upper layer is supported by the top frame 530, the top is stopped by the top wall of the battery box 100, and the side is stopped by the side wall of the battery box 100 and the groove wall of the frame groove 110, so as to realize reliable fixation of the first battery pack 410 in the upper layer.

[0058] As shown in FIG. 3, optionally, the force-bearing structure 500 includes a plurality of horizontal bars and a plurality of vertical bars. The bottom frame 510 is formed by the horizontal bars 5101 and the vertical bars 5102 being connected in a horizontal and vertical staggered manner, and the top frame 530 is formed by another part of the horizontal bars 5101 and another part of the vertical bars 5102 being connected in a horizontal and vertical staggered manner, thereby improving the strength and rigidity of the force-bearing structure 500. In this embodiment, the force-bearing structure 500 can be assembled into one body by welding or screwing. For example, the top frame 530 is fixed on each stand 520 by screwing, and the bottom frame 510 and each stand 520 are fixed on the bottom plate 330 by screwing.

[0059] Optionally, the material of the force-bearing structure 500 is CP820 / 1180DP. CP820 / 1180DP is a high-strength steel material. Compared with the aluminum profile main force-bearing structure scheme, the CP820 / 1180DP can further realize the effects of low cost and low self-weight while meeting the overall strength and rigidity requirements of the power battery system.

[0060] As shown in FIGS. 4 and 5, optionally, the two-layer first battery pack 410 includes at least one battery cluster 411 and at least two liquid cooling pieces 412 arranged alternately along a third direction, each battery cluster 411 has corresponding liquid cooling pieces 412 on both sides, each battery cluster 411 is composed of a plurality of batteries stacked along the thickness direction of the battery, and the thickness direction of the battery, the third direction, and the stacking direction of the two-layer first battery pack 410 are perpendicular to each other. The liquid cooling piece 412 is clamped and fixed between adjacent battery clusters 411, thereby realizing double-sided cooling of each battery in the first battery pack 410 and double-sided utilization of the flow channel. Compared with the traditional scheme, the heat management effect and efficiency are effectively improved, and the corresponding cooling demand of the fast charging of the power battery system and the low energy consumption demand of the long endurance of the whole vehicle are met. In addition, in an extreme temperature change environment, the traditional bottom cooling is easy to produce condensation phenomenon at the bottom of the upper liquid cooling plate, which affects the safety of the power battery insulation. Different from this, the liquid cooling piece 412 in the working state of the present scheme is clamped by the batteries on both sides, the low-temperature surface is not exposed to the air environment in the battery box 100, the generation conditions of the condensation phenomenon are blocked, and the system safety is improved. In this embodiment, the liquid cooling piece 412 is a micro-channel liquid cooling pipe which is bonded to the battery clusters 411 on both sides through a heat-conducting structural adhesive. Optionally, adjacent liquid cooling pieces 412 are connected through a manifold 414 to realize the flow of fluid between the liquid cooling pieces 412. For example, the manifold 414 is arranged at one end of the liquid cooling piece 412 in the length direction.

[0061] In this embodiment, the third direction is the same as the first direction, which is the length direction of the battery box 100, and each battery in the battery cluster 411 is stacked along the width direction of the battery box 100.

[0062] As shown in Figures 4 and 5, optionally, the two-layer first battery pack 410 also includes a bracket 413, with each battery cluster 411 mounted on the bracket 413. The bracket 413 includes multiple intersecting longitudinal beams 4131 and multiple transverse beams 4132, the cross-sections of which are all U-shaped. Unlike the traditional large-area flat structure of aluminum profile base plate 330 (wall thickness 2-3mm), the bracket 413 in this design achieves low cost and low weight. In this embodiment, the intersections of the longitudinal beams 4131 and transverse beams 4132 are welded by resistance welding.

[0063] Optionally, the battery surface is provided with an insulating coating and is bonded to the bracket 413. For example, windows are opened on both sides of the bottom area of ​​the battery. The windows on both sides mean that the insulating coating is used instead of the blue film in the area close to the edge on both sides. The bonding strength between the insulating coating and the structural adhesive is significantly better than that of the blue film, which effectively reduces the amount of structural adhesive used and improves the bonding strength between the battery and the bracket 413.

[0064] Optionally, the top wall of the battery box 100 is provided with a first connecting part 230, and the bottom wall of the battery box 100 is provided with a second connecting part. Thus, the power battery system can be fixed to the vehicle by a combination of bottom support and top suspension. Unlike the traditional bottom support type fixing, the load distribution of the power battery system bracket (the connection medium between the power battery system and the vehicle) is more even and reasonable, which can support the lightweight design of the power battery system bracket.

[0065] In this embodiment, the raised structure 212 of the concave-convex structure plate 210 has an opening, and the first connecting part 230 is disposed on the top frame 530 and extends upward through the opening of the concave-convex structure plate 210 to connect with the whole vehicle. The top frame 530 is provided with a sealing element, which seals the opening inside the battery box 100 to achieve a sealing effect.

[0066] In this embodiment, the second connecting part is arranged outside the base plate 330 and connected to the whole vehicle.

[0067] This embodiment also provides a vehicle including a frame and the aforementioned power battery system, the frame being located within at least one frame slot 110. The vehicle in this embodiment can be a commercial vehicle.

Claims

1. A power battery system, including: A battery box (100) has an internal accommodating space. The top wall of the battery box (100) is provided with at least one frame slot (110). The at least one frame slot (110) divides the accommodating space into at least two connected first spaces (120) and at least one second space (130). For each frame slot, the two ends of the frame slot (110) are connected, and corresponding first spaces (120) are distributed on both sides in the slot width direction. The corresponding second spaces (130) are distributed on one side of the frame slot (110) in the slot depth direction. A battery module, comprising at least one first battery module and at least one second battery module, wherein a corresponding first battery module is disposed in each first space (120) and a corresponding second battery module is disposed in each second space (130); as well as A load-bearing structure (500) is disposed within the receiving space, and the load-bearing structure (500) limits the at least one first battery module and the at least one second battery module.

2. The power battery system according to claim 1, wherein, The battery box (100) includes a first half-shell (200) and a second half-shell (300), which are fastened together to form the receiving space. The first half-shell (200) includes a concave-convex structure plate (210), which has at least one recessed structure (211) and at least two protruding structures (212) arranged alternately. For each recessed structure (211), there are corresponding protruding structures (212) on both sides of the recessed structure (211). The recessed structure (211) is recessed in the direction from the first half shell (200) to the second half shell (300). There is a corresponding second space (130) between the recessed structure (211) and the second half shell (300). There is a corresponding frame groove (110) inside the recessed structure (211). For each of the protruding structures (212), the protruding structure (212) protrudes in the direction from the second half-shell (300) to the first half-shell (200), and there is a corresponding first space (120) between the protruding structure (212) and the second half-shell (300).

3. The power battery system according to claim 2, wherein, The second half-shell (300) includes an inner plate (310) and an outer skin (320). The inner plate (310) is opposite to the concave-convex structural plate (210), and the outer skin (320) is located on the side of the inner plate (310) away from the concave-convex structural plate (210), and forms a hollow layer between the inner plate (310) and the outer skin.

4. The power battery system according to claim 2, wherein, The first half-shell (200) also includes two first side plates (220), the at least one recessed structure (211) and the at least two protruding structures (212) are alternately recessed and protruding along a first direction, and the two first side plates (220) are disposed opposite to each other at both ends of the recessed and protruding structure plate (210) in the first direction; The second half shell (300) includes a bottom plate (330) and two second side plates (340). The two second side plates (340) are oppositely arranged at both ends of the bottom plate (330) in the second direction, and the first direction is perpendicular to the second direction. And Both ends of the concave-convex structure plate (210) in the second direction are respectively butted against the two second side plates (340), both ends of the bottom plate (330) in the first direction are respectively butted against the two first side plates (220), and each first side plate (220) is butted against the corresponding second side plate (340).

5. The power battery system according to claim 4, wherein, The first half shell (200) is integrally formed by bending a sheet material.

6. The power battery system according to claim 1, wherein, Each first battery module includes two layers of first battery groups (410) stacked one above the other, the second battery module includes one layer of second battery groups (420), the two layers of first battery groups (410) and the second battery groups (420) all include at least one battery cluster (411), and each battery cluster (411) includes a plurality of batteries.

7. The power battery system according to claim 6, wherein, The bearing structure (500) includes a bottom frame (510), a top frame (530) and a plurality of vertical frames (520) arranged at intervals in the horizontal direction. The bottom frame (510) and the plurality of vertical frames (520) are both arranged at the bottom of the battery box (100), the top frame (530) is arranged on the plurality of vertical frames (520) and is spaced apart from the bottom frame (510) vertically. Each second battery group (420) and each first battery group (410) located in the lower layer are both arranged between the bottom frame (510) and the top frame (530) and are both blocked by the adjacent vertical frames (520), and each first battery group (410) located in the upper layer is arranged on the side of the top frame (530)背离 the bottom frame (510).

8. The power battery system according to claim 7, wherein, The bearing structure (500) includes a plurality of cross bars (5101) and a plurality of longitudinal bars (5102). The bottom frame (510) is formed by crosswise connection of some cross bars (5101) and some longitudinal bars (5102), and the top frame (530) is formed by crosswise connection of another part of cross bars (5101) and another part of longitudinal bars (5102).

9. The power battery system according to claim 1, wherein, The material of the bearing structure (500) is CP820 / 1180DP.

10. The power battery system according to claim 6, wherein, The two layers of first battery groups (410) include the at least one battery cluster (411) and at least two liquid cooling components (412) arranged alternately in the third direction. Each side of each battery cluster (411) has a corresponding liquid cooling component (412). Each battery cluster (411) is composed of a plurality of batteries stacked in the thickness direction of the battery, and the thickness direction of the battery, the third direction and the stacking direction of the two layers of first battery groups (410) are perpendicular to each other in pairs.

11. The power battery system according to claim 10, wherein, The two layers of first battery groups (410) further include a bracket (413). Each battery cluster (asd411) is arranged on the bracket (413). The bracket (413) includes a plurality of longitudinal beams (4131) and a plurality of cross beams (4132) connected crosswise. The cross sections of the plurality of longitudinal beams (4131) and the plurality of cross beams (4132) are both in a "U" shape.

12. The power battery system according to claim 11, wherein, Each battery surface has an insulating coating and is bonded to the bracket (413).

13. The power battery system according to any one of claims 1-11, wherein, Along the width direction of the at least one frame slot (110), the top wall of the battery box (100) is provided with two frame slots (110) spaced apart. The accommodating space includes three first spaces (120), and the three first spaces (120) and the two frame slots (110) are alternately distributed along the width direction of the frame slots (110).

14. The power battery system according to any one of claims 1-11, wherein, The battery box (100) has a first connecting part (230) on the outside of the top wall and a second connecting part on the outside of the bottom wall.

15. A vehicle, comprising a frame and a power battery system as claimed in any one of claims 1-14, the frame being located within the at least one frame slot (110).

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