Battery box body, battery system and engineering vehicle

Abstract

The invention relates to a battery box, a battery system and an engineering vehicle, and the battery box comprises a frame assembly (1) which comprises a first frame (11) and a second frame (12) which are oppositely arranged along a first direction (X), and a third frame (13) and a fourth frame (14) which are oppositely arranged along a second direction (Y); the heat exchange plate (2) is vertically connected with the frame assembly (1), and an accommodating space is formed by the heat exchange plate (2) and the frame assembly (1); the battery module (3) is arranged in the accommodating space; the first frame (11), the second frame (12), the third frame (13), the fourth frame (14) and the heat exchange plate (2) are formed through extrusion. The first direction (X) is perpendicular to the second direction (Y).

Description

Technical Field

[0001] The present disclosure relates to the field of power batteries, and in particular to a battery box, a battery system and an engineering vehicle. Background Art

[0002] Due to the natural advantages of electricity prices and the reduction of battery costs, pure electric solutions are becoming more and more popular in the field of commercial vehicles. However, in actual applications, commercial vehicles usually use standard boxes to group together, which requires additional frames on the outside, greatly limiting the improvement of the system's energy density.

[0003] The battery stacking solution in the related art still has a lot of room for improvement in terms of space utilization, and the layout of the pipelines also causes waste of space outside the battery box. Summary of the invention

[0004] In view of this, the embodiments of the present disclosure provide a battery box, a battery system and an engineering vehicle, which can improve the integration level.

[0005] In one aspect of the present disclosure, a battery box is provided, comprising:

[0006] A frame assembly, comprising a first frame and a second frame arranged opposite to each other along a first direction, and a third frame and a fourth frame arranged opposite to each other along a second direction;

[0007] A heat exchange plate is vertically connected to the frame assembly and forms a receiving space together with the frame assembly; and

[0008] A battery module is arranged in the accommodation space;

[0009] Wherein, the first frame, the second frame, the third frame, the fourth frame and the heat exchange plate are formed by extrusion;

[0010] The first direction is perpendicular to the second direction.

[0011] In some embodiments, the battery case further comprises:

[0012] A first beam is formed by extrusion, extends along a first direction, and is spaced apart from the first frame along a second direction, the first beam is connected to the third frame and the fourth frame respectively, and the first beam is configured to divide the accommodation space into a first installation space and a second installation space;

[0013] Connecting devices, including conductive connectors, pipe assemblies, wiring harness assemblies and / or control assemblies;

[0014] The connecting device is arranged in the first installation space, and the battery module is arranged in the second installation space.

[0015] In some embodiments, the battery case further comprises:

[0016] The second beam is formed by extrusion, extends along the second direction, is arranged in the second installation space, and is configured to divide the second installation space into a plurality of sub-spaces to carry a plurality of battery modules.

[0017] In some embodiments, the first frame has a first reinforcement portion and a second reinforcement portion protruding out of the battery box along the second direction, and the first reinforcement portion and the second reinforcement portion are spaced apart along the third direction;

[0018] The battery box also includes:

[0019] Plug-in devices, including high-voltage junction boxes, water diversion ports, explosion-proof valves, maintenance switches and / or low-voltage connectors;

[0020] The plug-in device is connected to the first frame and is arranged in a third installation space between the first reinforcement portion and the second reinforcement portion along a third direction;

[0021] The first installation space is close to the first frame, and the third direction is perpendicular to the first direction and the second direction.

[0022] In some embodiments, the first frame further has a first connection portion protruding toward the inside of the battery box along the second direction, and the first frame is connected to the heat exchange plate through the first connection portion;

[0023] The first connecting part has a cavity inside.

[0024] In some embodiments, the third frame and the fourth frame have reinforcing ribs arranged at intervals therein.

[0025] In some embodiments, the third frame and the fourth frame respectively have a second connection portion and a third connection portion protruding toward the inside of the battery box along the first direction, the third frame is connected to the heat exchange plate through the second connection portion, and the fourth frame is connected to the heat exchange plate through the third connection portion;

[0026] The second connection part and the third connection part have cavities inside.

[0027] In some embodiments, the second beam has a fourth connection portion extending along the first direction toward the third frame and the fourth frame respectively, and the second beam is connected to the heat exchange plate through the fourth connection portion;

[0028] The fourth connecting portion has a cavity inside.

[0029] In some embodiments, the third frame and the fourth frame are provided with mounting holes for stacking.

[0030] In another aspect of the present disclosure, there is provided a battery system, comprising:

[0031] A plurality of battery boxes as in any of the above embodiments, wherein the third frame and the fourth frame of each battery box are provided with mounting holes, and two adjacent layers of battery boxes are connected via the mounting holes.

[0032] In some embodiments, the battery system further comprises:

[0033] A cover plate connected to a battery case located at a top layer of the multi-layer battery case; and

[0034] The power distribution device is arranged on the cover plate and connected to the wiring harness of the battery box, and the high-voltage outlet direction of the power distribution device is downward;

[0035] Among them, the battery box has two high-voltage junction boxes, the outlet directions of the two high-voltage junction boxes are arranged relatively, and both are close to the high-voltage outlet direction of the power distribution device.

[0036] In some embodiments, the battery system further comprises:

[0037] The pipeline assembly passes through the cover plate and is connected to the power distribution device and the battery box respectively;

[0038] The protective member is arranged on the cover plate and is configured to seal the gap between the pipeline assembly and the cover plate.

[0039] In some embodiments, the battery system further comprises:

[0040] The heat-insulating component is arranged outside the battery boxes and connected to the cover plate.

[0041] In another aspect of the present disclosure, there is provided an engineering vehicle, comprising:

[0042] A battery system as in any of the above embodiments.

[0043] Therefore, according to the embodiment of the present disclosure, the frame assembly and heat exchange plate of the battery box are made of profiles, which can be flexibly laid out and easily expanded, easy to assemble and disassemble, and can also reduce the weight and manufacturing cost of the battery box, thereby achieving a higher degree of integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0045] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0046] Figure 1 is a schematic structural diagram of some embodiments of a battery box according to the present disclosure;

[0047] Figure 2 is a schematic structural diagram of other embodiments of the battery box according to the present disclosure;

[0048] Figure 3 is a top view of some embodiments of a battery case according to the present disclosure;

[0049] Figure 4 is a side view of some embodiments of a battery case according to the present disclosure;

[0050] Figure 5 is a cross-sectional view of some embodiments of a battery case according to the present disclosure;

[0051] Figure 6 are cross-sectional views of other embodiments of the battery case according to the present disclosure;

[0052] Fig. 7A is a cross-sectional view of a first frame of some embodiments of a battery case according to the present disclosure;

[0053] Figure 7B is a cross-sectional view of a third frame of some embodiments of a battery box according to the present disclosure;

[0054] Figure 7C is a cross-sectional view of a second beam according to some embodiments of the battery case of the present disclosure;

[0055] Fig.7D is a cross-sectional view of a heat exchange plate according to some embodiments of the battery case of the present disclosure;

[0056] Figure 8 is a schematic diagram of the structure of some embodiments of the battery system according to the present disclosure;

[0057] Fig. 9 is a side view of some embodiments of a battery system according to the present disclosure;

[0058] Fig.10 is a top view of a cover plate according to some embodiments of the battery system of the present disclosure;

[0059] Fig.11 is a cross-sectional view of some embodiments of the battery system according to the present disclosure;

[0060] Fig.12 yes Fig.11 Partial schematic diagram of area A in the middle.

[0061] In the figure:

[0062] 1. Frame assembly; 10. Mounting hole; 11. First frame; 110. Third mounting space; 111. First reinforcement; 112. Second reinforcement; 113. First connection; 12. Second frame; 13. Third frame; 131. Second connection; 14. Fourth frame; 141. Third connection; 15. Lifting hole; 2. Heat exchange plate; 3. Battery module; 41. First beam; 42. Second beam; 421. Fourth connection; 51. First mounting space; 52. Second mounting space; 6. Connecting device; 61. Conductive connection Connectors; 62, pipeline components; 63, wiring harness components; 64, control components; 7, plug-in device; 71, high-voltage junction box; 711, positive connector; 712, negative connector; 72, water inlet; 73, explosion-proof valve; 74, maintenance switch; 75, low-voltage connector; 81, cover plate; 82, protective parts; 821, box connector; 822, gland; 823, sealing plate; 83, insulation parts; 91, power distribution device; 910, power distribution device connector; 92, low-voltage control device; 93, high-voltage wiring harness; 94, low-voltage wiring harness; 95, water pipe;

[0063] X, first direction; Y, second direction; Z, third direction.

[0064] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0065] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0066] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0067] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.

[0068] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0069] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0070] The battery stacking solution in the related technology still has a lot of room for improvement in space utilization, and the layout of the pipelines also causes waste of space outside the battery box. As the integration of the battery system increases, heat is more easily dissipated into the environment, bringing pressure to the vehicle's water cooling unit.

[0071] In view of this, in one aspect of an embodiment of the present disclosure, a battery housing is provided to help improve integration.

[0072] Figure 1 is a schematic structural diagram of some embodiments of the battery box according to the present disclosure, Figure 2 is a schematic structural diagram of other embodiments of the battery box according to the present disclosure, Figure 3 is a top view of some embodiments of the battery case according to the present disclosure, Figure 4 is a side view of some embodiments of the battery case according to the present disclosure, Figure 5 is a cross-sectional view of some embodiments of the battery case according to the present disclosure, Figure 6 are cross-sectional views of other embodiments of the battery case according to the present disclosure, with reference to Figure 1 to Figure 6 The battery box includes: a frame assembly 1, a heat exchange plate 2 and a battery module 3.

[0073] The frame assembly 1 includes a first frame 11 and a second frame 12 arranged opposite to each other along a first direction X, and a third frame 13 and a fourth frame 14 arranged opposite to each other along a second direction Y. The heat exchange plate 2 is vertically connected to the frame assembly 1 and forms a receiving space together with the frame assembly 1. The battery module 3 is arranged in the receiving space.

[0074] The first frame 11, the second frame 12, the third frame 13, the fourth frame 14 and the heat exchange plate 2 are formed by extrusion.

[0075] The heat exchange plate 2 includes but is not limited to being connected to the frame assembly 1 by welding, such as stir friction welding, and the heat exchange plate 2 does not need to be assembled later, which has a higher degree of integration. The heat exchange plate 2 includes but is not limited to being a liquid cooling plate, which is configured to contain coolant and bear the weight of the battery cell. The first frame 11, the second frame 12, the third frame 13, and the fourth frame 14 are connected to each other by welding.

[0076] The frame assembly 1 and the heat exchange plate 2 include but are not limited to aluminum extrusion molding, which can achieve lighter weight and lower cost, and is simpler and more reliable to process than casting molding in related extrusion.

[0077] In this embodiment, the frame assembly 1 and the heat exchange plate 2 of the battery box are both made of profiles, which can be flexibly arranged and easily expanded, easy to assemble and disassemble, and can also reduce the weight and manufacturing cost of the battery box, thereby achieving a higher degree of integration.

[0078] refer to Figure 1 to Figure 6 In some embodiments, the battery box further includes a first beam 41 and a connecting device 6. The first beam 41 is formed by extrusion, extends along the first direction X, and is spaced apart from the first frame 11 along the second direction Y. The first beam 41 is respectively connected to the third frame 13 and the fourth frame 14. The first beam 41 is configured to divide the accommodation space into a first installation space 51 and a second installation space 52.

[0079] The connection device 6 includes a conductive connector 61, a pipe assembly 62, a wiring harness assembly 63 and / or a control assembly 64. The conductive connector 61 includes but is not limited to a bar, and the control assembly 64 includes but is not limited to a sensor and a controller. The connection device 6 is arranged in the first installation space 51, and the first installation space 51 is through along the first direction X. The battery module 3 is arranged in the second installation space 52.

[0080] In this embodiment, the first beam 41 is arranged in the accommodating space and is divided into a second installation space 52 for carrying the battery module 3 and a first installation space 51 for placing the connecting device 6, leaving a dedicated space for the connecting device 6, making maximum use of the space in the box, and improving the utilization rate of the battery box. The first beam 41 between the connecting device 6 and the battery module 3 can also enhance the stability of the battery box, reduce the vibration of the battery box during transportation and use, and protect the battery module 3 and the connecting device 6 from damage.

[0081] refer to Figure 1 to Figure 6In some embodiments, the battery box also includes a second beam 42, which is formed by extrusion, extends along the second direction Y, and is arranged in the second installation space 52, and is configured to divide the second installation space 52 into a plurality of sub-spaces to carry a plurality of battery modules 3.

[0082] In this embodiment, the number of second beams 42 can be multiple, and the second beams 42 divide the second installation space 52 into multiple sub-spaces for placing battery modules 3. The battery modules 3 can be arranged more compactly in the box body, maximizing the use of the internal space of the box body. Each divided space can be designed to be of standardized size, which is convenient for the installation and replacement of battery modules of different models and specifications, reduces mutual interference between different battery modules 3, improves the reliability of each battery module 3, and enhances the structural stability of the battery box body.

[0083] Fig. 7A is a cross-sectional view of a first frame of some embodiments of the battery box according to the present disclosure, referring to Figure 1 , Figure 4 and Fig. 7A In some embodiments, the first frame 11 has a first reinforcing portion 111 and a second reinforcing portion 112 protruding out of the battery box along the second direction Y, and the first reinforcing portion 111 and the second reinforcing portion 112 are spaced apart along the third direction Z.

[0084] The battery box also includes a plug-in device 7, including a high-voltage junction box 71, a water inlet 72, an explosion-proof valve 73, a maintenance switch 74 and / or a low-voltage connector 75. The water inlet 72 includes but is not limited to a water inlet and a water outlet. The plug-in device 7 is connected to the first frame 11 and is arranged in the third installation space 110 between the first reinforcement part 111 and the second reinforcement part 112 along the third direction Z.

[0085] The first installation space 51 is close to the first frame 11 , and the third direction Z is perpendicular to both the first direction X and the second direction Y. The first frame 11 is disposed close to the first installation space 51 to facilitate docking with the connection device 6 in the first installation space 51 .

[0086] The thickness of the first frame 11 is greater than that of other frames. The third installation space 110 between the first reinforcement portion 111 and the second reinforcement portion 112 is recessed relative to the first reinforcement portion 111 and the second reinforcement portion 112 to provide an installation space for the plug-in device 7. The installation surface of the third installation space 110 is flat.

[0087] The first reinforcement portion 111 and the second reinforcement portion 112 are two independent cavity structures. The first reinforcement portion 111 includes but is not limited to being arranged at intervals along the first direction X, and the second reinforcement portion 112 includes but is not limited to being continuously extended along the first direction X.

[0088] In this embodiment, the first reinforcing portion 111 and the second reinforcing portion 112 can enhance the structural strength of the first frame 11 and can also provide a suitable installation space for the plug-in device 7, thereby helping to improve the integration of the battery box.

[0089] refer to Figure 4 and Fig. 7A In some embodiments, the first frame 11 further has a first connection portion 113 protruding toward the inside of the battery box along the second direction Y, and the first frame 11 is connected to the heat exchange plate 2 through the first connection portion 113. The first connection portion 113 has a cavity inside.

[0090] The first connection portion 113 includes but is not limited to a small and narrow hollow fin, which is used to connect with the heat exchange plate 2. The heat exchange plate 2 is connected with the first frame 11 by, but is not limited to, friction stir welding.

[0091] In this embodiment, the first connection part 113 connected to the heat exchange plate 2 adopts a hollow structure, which can shorten the heat transfer path when the heat in the heat exchange plate 2 is transferred outward through the first connection part 113, and can effectively reduce the loss caused by heat transfer to the box body, so as to reduce the burden on the water cooling unit of the whole vehicle when the battery boxes are stacked.

[0092] Figure 7B is a cross-sectional view of the third frame of some embodiments of the battery box according to the present disclosure, referring to Figure 5 and Figure 7B In some embodiments, the third frame 13 and the fourth frame 14 have spaced reinforcing ribs inside. In this embodiment, by adding reinforcing ribs inside the profiles of the third frame 13 and the fourth frame 14, compared with external reinforcing ribs, the space occupied by the battery box can be more effectively saved and the energy density of the battery box can be improved.

[0093] refer to Figure 5 and Figure 7B In some embodiments, the third frame 13 and the fourth frame 14 respectively have a second connection portion 131 and a third connection portion 141 protruding toward the inside of the battery box along the first direction X, the third frame 13 is connected to the heat exchange plate 2 through the second connection portion 131, and the fourth frame 14 is connected to the heat exchange plate 2 through the third connection portion 141. The second connection portion 131 and the third connection portion 141 have cavities inside.

[0094] In this embodiment, the third connection part 141 and the second connection part 131 connected to the heat exchange plate 2 adopt a hollow structure, which can shorten the heat transfer path when the heat in the heat exchange plate 2 is transferred outward through the third connection part 141 and the second connection part 131, and can effectively reduce the loss caused by heat transfer to the box body, so as to reduce the burden on the water cooling unit of the whole vehicle when the battery boxes are stacked.

[0095] Figure 7Cis a cross-sectional view of the second beam of some embodiments of the battery box according to the present disclosure, with reference to Figure 5 and Figure 7C In some embodiments, the second beam 42 has a fourth connection portion 421 extending along the first direction X toward the third frame 13 and the fourth frame 14, and the second beam 42 is connected to the heat exchange plate 2 through the fourth connection portion 421. The fourth connection portion 421 has a cavity inside.

[0096] The second beam 42 is divided into two parts, the upper part is a profile structure, isolating the battery module 3, and the lower fourth connecting part 421 is a hollow profile. The fourth connecting part 421 extends to both sides of the battery box and is used to connect with the heat exchange plate 2.

[0097] In this embodiment, the fourth connection part 421 connected to the heat exchange plate 2 adopts a hollow structure, which can shorten the heat transfer path when the heat in the heat exchange plate 2 is transferred outward through the fourth connection part 421, and can effectively reduce the loss caused by heat transfer to the box body, so as to reduce the burden on the water cooling unit of the whole vehicle when the battery boxes are stacked.

[0098] Fig.7D is a cross-sectional view of a heat exchange plate according to some embodiments of the battery box of the present disclosure, with reference to Figure 5 and Fig.7D The heat exchange plate 2 is a standard profile structure, and there are multiple regular small cavities inside the profile for containing the coolant. The heat exchange plate 2 can be extruded as a whole, or it can be spliced ​​by multiple profile cold plates.

[0099] refer to Figure 1 and Figure 4 In some embodiments, the third frame 13 and the fourth frame 14 are provided with mounting holes 10 for stacking. A hoisting hole may also be provided below the mounting hole 10. In this embodiment, the mounting hole 10 is used for bolting between battery case layers when the battery cases are stacked, and the hoisting hole 15 is used for hoisting the battery cases.

[0100] Figure 8 is a schematic diagram of the structure of some embodiments of the battery system according to the present disclosure, Fig. 9 is a side view of some embodiments of the battery system according to the present disclosure, Fig.10 is a top view of a cover plate according to some embodiments of the battery system of the present disclosure, with reference to Figure 1 to Figure 10 In another aspect of the embodiments of the present disclosure, a battery system is provided, comprising a plurality of battery cases as in any of the above embodiments, wherein the third frame 13 and the fourth frame 14 of each battery case have mounting holes 10, and two adjacent layers of battery cases are connected via the mounting holes 10.

[0101] In this embodiment, the battery boxes in the battery system are stacked layer by layer, eliminating the frame structure, making full use of the space so that the battery boxes can accommodate more battery cells in a limited space, thereby increasing the energy density of the battery system and improving the integration of the battery system.

[0102] refer to Figure 1 to Figure 10 In some embodiments, the battery system further includes a cover plate 81 and a power distribution device 91. The cover plate 81 is connected to the battery box located at the top layer of the multi-layer battery box, and the power distribution device 91 is arranged on the cover plate 81 and connected to the battery box wiring harness, and the high-voltage outlet direction of the power distribution device 91 is downward. The battery box has two high-voltage junction boxes 71, and the outlet directions of the two high-voltage junction boxes 71 are arranged oppositely and are close to the high-voltage outlet direction of the power distribution device 91.

[0103] The cover plate 81 is placed on the top battery box of the stacked battery boxes to isolate the battery module 3 from the external environment. The cover plate 81 is provided with a power distribution device 91 and a low voltage control device 92 for connecting with the high and low voltage circuits of the vehicle.

[0104] The high and low voltage harnesses outside the battery system are divided into two independent areas: a high voltage harness 93 and a low voltage harness 94. The high voltage harness 93 is connected to the high voltage junction box 71 and the power distribution device connector 910 respectively.

[0105] The positive connector 711 and the negative connector 712 of the high-voltage junction box 71 are arranged opposite to each other, and the outlet directions of the positive connector 711 and the negative connector 712 are close to each other, and the outlet direction of the power distribution device connector 910 is downward. The end surface of the high-voltage junction box 71 of the battery box and the power distribution device connector 910 of the power distribution device 91 are including but not limited to being in the same plane along the vertical direction to reduce the bending of the wire harness.

[0106] In this embodiment, the outgoing direction of the high-voltage junction box 71 is toward the inside of the battery box and is arranged relatively, and the outgoing direction of the distribution device 91 is toward the battery box. This can shorten the length of the wire harness, reduce the bending of the wire harness, optimize the layout of the wire harness pipeline, save space outside the package, and help improve the integration of the battery system.

[0107] refer to Figure 1 to Figure 10 In some embodiments, the battery system further includes a pipeline assembly and a protective member 82. The pipeline assembly passes through the cover plate 81 and is respectively connected to the power distribution device 91 and the battery box. The protective member 82 is disposed on the cover plate 81 and is configured to block the gap between the pipeline assembly and the cover plate 81.

[0108] The pipeline assembly includes a water pipe 95, a high-voltage wire harness 93 and a low-voltage wire harness 94, and the protective member 82 includes but is not limited to a box-penetrating joint 821, a gland 822 and a sealing plate 823. The box-penetrating joint 821 is used around the water pipe 95, and the pipeline connects the two ends of the joint without damaging the cover plate 81; the high-voltage wire harness 93 is blocked by a gland 822, and the low-voltage wire harness 94 is protected by a sealing plate 823.

[0109] When the battery system is used in a loader, since the loader's operating scene is full of dust and corrosive liquids, the wiring harness, water pipes, etc. are blocked by the protective member 82 when crossing the skin between the battery box and the distribution device to avoid the formation of weak areas susceptible to corrosion.

[0110] In this embodiment, by providing the protective member 82, the risk of weak points in the avoidance area is reduced when the pipelines and wiring harnesses pass through the cover plate 81, foreign matter and corrosive liquids are prevented from invading the area where the stacked batteries are located, thereby improving the reliability of the battery system.

[0111] Fig.11 is a cross-sectional view of some embodiments of the battery system according to the present disclosure, Fig.12 yes Fig.11 Partial schematic diagram of area A in the middle, reference Fig.11 and Fig.12 The areas where the frame assembly 1, the second beam 42 and the heat exchange plate 2 are connected all adopt a hollow structure. When the heat in the heat exchange plate 2 is transferred outward, the heat transfer path is shortened by more than 60% through these hollow areas, effectively reducing the loss caused by heat transfer to the box.

[0112] refer to Figure 1 to Figure 10 In some embodiments, the battery system further includes a thermal insulation member 83, which is connected to the cover plate 81. The thermal insulation member 83 is disposed outside the stacked battery boxes, covers the periphery of the battery boxes, and isolates the stacked battery boxes from the external environment.

[0113] In this embodiment, the insulation member 83 outside the box is a composite structure, which is a layer of steel plate plus a layer of compressible foam. The foam is pressed against the surface of the stacked box by the steel plate, and the air in the cavity is sealed in the cavity, and the outside air cannot enter the cavity, which greatly reduces the heat transfer path. In addition, the foam can also play a role in heat preservation, so that the heat input to the battery by the vehicle water cooling unit will not be easily dissipated into the air, which can effectively reduce the burden of the stacked box on the vehicle water cooling unit.

[0114] In another aspect of the embodiments of the present disclosure, there is provided an engineering vehicle, comprising: a battery system as described in any of the above embodiments.

[0115] In this embodiment, the engineering vehicles include but are not limited to loaders. The engineering vehicles use a stacked battery system, which can make full use of the limited space inside the vehicle, improve the energy density of the battery system, and increase the vehicle's endurance. The modular battery system is easy to install and maintain, and the number of layers and capacity of the battery box can be adjusted according to the specific needs of the engineering vehicle. The battery system can be flexibly configured to meet the needs of different work tasks.

[0116] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0117] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A battery box, characterized in that: include: A frame assembly (1), comprising a first frame (11) and a second frame (12) arranged opposite to each other along a first direction (X), and a third frame (13) and a fourth frame (14) arranged opposite to each other along a second direction (Y); A heat exchange plate (2) vertically connected to the frame assembly (1) and forming a receiving space together with the frame assembly (1); and A battery module (3) is arranged in the accommodation space; Wherein, the first frame (11), the second frame (12), the third frame (13), the fourth frame (14) and the heat exchange plate (2) are formed by extrusion; The first direction (X) is perpendicular to the second direction (Y).

2. The battery box according to claim 1, characterized in that: Also includes: a first beam (41) formed by extrusion, extending along the first direction (X), and spaced apart from the first frame (11) along the second direction (Y); the first beam (41) being connected to the third frame (13) and the fourth frame (14), respectively; and the first beam (41) being configured to divide the accommodation space into a first installation space (51) and a second installation space (52); A connecting device (6), comprising a conductive connecting piece (61), a pipeline assembly (62), a wiring harness assembly (63) and / or a control assembly (64); Wherein, the connecting device (6) is arranged in the first installation space (51), and the battery module (3) is arranged in the second installation space (52).

3. The battery case according to claim 2, characterized in that: Also includes: The second beam (42) is formed by extrusion, extends along the second direction (Y), is arranged in the second installation space (52), and is configured to divide the second installation space (52) into a plurality of subspaces to carry a plurality of the battery modules (3).

4. The battery case according to claim 2, characterized in that: The first frame (11) comprises a first reinforcing portion (111) and a second reinforcing portion (112) protruding toward the outside of the battery box along the second direction (Y), and the first reinforcing portion (111) and the second reinforcing portion (112) are arranged at intervals along the third direction (Z); Wherein, the battery box also includes: A plug-in device (7), comprising a high-voltage junction box (71), a water inlet (72), an explosion-proof valve (73), a maintenance switch (74) and / or a low-voltage connector (75); The plug-in device (7) is connected to the first frame (11), and is arranged in the third installation space (110) between the first reinforcement portion (111) and the second reinforcement portion (112) along the third direction (Z); The first installation space (51) is close to the first frame (11), and the third direction (Z) is perpendicular to the first direction (X) and the second direction (Y).

5. The battery case according to claim 4, characterized in that: The first frame (11) further comprises a first connection portion (113) protruding toward the inside of the battery box along the second direction (Y), and the first frame (11) is connected to the heat exchange plate (2) via the first connection portion (113); Wherein, the first connecting portion (113) has a cavity inside.

6. The battery case according to claim 1, characterized in that: The third frame (13) and the fourth frame (14) have reinforcing ribs arranged at intervals inside.

7. The battery case according to claim 6, characterized in that: The third frame (13) and the fourth frame (14) respectively have a second connection portion (131) and a third connection portion (141) protruding toward the interior of the battery box along the first direction (X); the third frame (13) is connected to the heat exchange plate (2) via the second connection portion (131); and the fourth frame (14) is connected to the heat exchange plate (2) via the third connection portion (141); Wherein, the second connecting portion (131) and the third connecting portion (141) have cavities inside.

8. The battery case according to claim 3, characterized in that: The second beam (42) has a fourth connection portion (421) extending along the first direction (X) towards the third frame (13) and the fourth frame (14), respectively, and the second beam (42) is connected to the heat exchange plate (2) via the fourth connection portion (421); Wherein, the fourth connecting portion (421) has a cavity inside.

9. The battery case according to any one of claims 1 to 8, characterized in that: The third frame (13) and the fourth frame (14) are provided with mounting holes (10) for stacking.

10. A battery system, characterized in that: include: A plurality of battery cases according to any one of claims 1 to 9, wherein the third frame (13) and the fourth frame (14) of each battery case are provided with a mounting hole (10), and two adjacent layers of the battery cases are connected via the mounting holes (10).

11. The battery system according to claim 10, characterized in that: Also includes: A cover plate (81) connected to the battery box located at the top layer of the plurality of battery boxes; and A power distribution device (91) is arranged on the cover plate (81) and is connected to the battery box wiring harness, with the high-voltage outlet direction of the power distribution device (91) being downward; The battery box has two high-voltage junction boxes (71), and the outlet directions of the two high-voltage junction boxes (71) are arranged opposite to each other and are both close to the high-voltage outlet direction of the power distribution device (91).

12. The battery system according to claim 11, characterized in that: Also includes: A pipeline assembly passes through the cover plate (81) and is respectively connected to the power distribution device (91) and the battery box; The protective member (82) is disposed on the cover plate (81) and is configured to seal a gap between the pipeline assembly and the cover plate (81).

13. The battery system according to claim 11, characterized in that: Also includes: The heat-insulating component (83) is disposed outside the plurality of battery boxes and is connected to the cover plate (81).

14. An engineering vehicle, characterized in that: include: A battery system as claimed in any one of claims 10 to 13.

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