Battery box body, battery system and electric vehicle

Abstract

The utility model relates to a power battery, in particular to a battery box body, a battery system and an electric vehicle, the battery box body comprises a bottom plate and four side plates, the side plates are side main plates made of thin steel plates, and the side main plates comprise vertical webs, upper mounting edges and lower mounting edges, and the upper mounting edges and the lower mounting edges are provided with a plurality of coaxial mounting holes; the four side plates are arranged in a square frame shape and are welded; bottom plate mounting supports are fixed to the bottoms of the inner side faces of the webs. A sealing step is arranged on the mounting edge of each side main plate; outer corner pieces are fixed to the outer sides of the adjacent connecting positions of the main plates on the two sides, the four edges of the outer corner pieces are correspondingly welded to the upper installation edge, the lower installation edge and the two adjacent web plates, and right-angle bent cavities are formed by the outer corner pieces and the main plates on the outer sides of the connecting ends. And a plurality of web supporting pieces of which the upper and lower ends are correspondingly and fixedly connected with the upper and lower mounting edges are fixed on the outer sides of at least one pair of opposite webs. The side plates of the battery box body are mainly made of the thin plates, and the thin plates are formed through roller rolling or compression molding, so that the weight of the battery box body can be effectively reduced, and the energy density of a battery system is improved.

Description

Technical Field

[0001] The utility model relates to a power battery, and more specifically, to a battery box body, a battery system and an electric vehicle. Background Art

[0002] Electric vehicles such as electric construction machinery have characteristics such as large power consumption and long continuous operation time, so the required battery capacity is large. To meet the power consumption requirements of electric vehicles, a multi-layer electric box integrated battery system is often adopted thereon. In this battery system, the electric box is formed by stacking multiple layers of battery box bodies, and multiple groups of battery modules are installed in each battery box body.

[0003] Each layer of battery box body in the battery system is a support for the upper layer of electric box. Each layer of battery module is relatively heavy, and at the same time, the shaking of the vehicle body during the operation of the electric vehicle drives the shaking of the battery system, which requires a relatively high strength for the battery box body. To meet its strength requirements, the battery box body of the existing battery system is usually made of thick steel plates welded together, which results in a heavy mass, a bulky structure and a low energy density of the battery system. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a battery box body, a battery system and an electric vehicle, so as to reduce the weight of the battery box body.

[0005] A battery box body of the utility model includes a bottom plate and four side plates. Each side plate includes a side main plate made of thin steel plate. The side main plate includes a vertical web and mounting edges arranged horizontally at the upper and lower edges of the web; a plurality of coaxially arranged mounting holes are provided on the upper and lower mounting edges;

[0006] The four side plates are arranged in a square frame shape, and the ends of the side main plates on each side are welded to the ends of the adjacent side main plates; a bottom plate mounting bracket for fixedly connecting with the bottom plate is fixed at the bottom of the inner side surface of the web of each side main plate;

[0007] A sealing step for placing a sealing strip is arranged at a position close to the inner side of the upper mounting edge of each side main plate, and the sealing step is lower than the upper mounting surface of the mounting edge, and the sealing steps are flush and connected end to end with the sealing steps on the adjacent side main plates;

[0008] An outer corner member is fixed on the outer side of the adjacent joints of the two side main plates; the outer corner member is made of a thin plate bent, and its four sides are respectively welded to the upper and lower mounting edges and the adjacent two webs and form a right-angled bending cavity with the outer sides of the connecting ends of the two side main plates;

[0009] A plurality of web support members are fixed on the outer side of the web of at least a pair of opposite side main plates, and the upper and lower ends of each web support member are fixedly connected to the upper and lower mounting edges correspondingly.

[0010] In the battery box of the utility model, the web support is made of a steel pipe, and the upper and lower mounting edges are provided with mounting holes coaxially aligned with the inner hole of the steel pipe.

[0011] In the battery box of the utility model, or the web support member includes a groove-shaped bent plate, the groove of which is welded to the outer side surface of the web, and the upper and lower ends are fixedly connected to the upper and lower mounting edges. Further, the upper and lower mounting edges have mounting holes opposite to the two ends of the web support member. The web support member also includes a steel pipe, which is arranged in the groove of the groove-shaped bent plate, and the two ends of the steel pipe are connected to the upper and lower mounting edges and the inner hole is coaxial with the corresponding mounting holes on the upper and lower mounting edges.

[0012] In the battery box of the utility model, two webs are provided with inner corner pieces at the connection, the inner corner pieces are formed by bending at ninety degrees, and two parts perpendicular to each other are correspondingly fitted and welded to the inner side surfaces of the two webs.

[0013] In the battery box of the utility model, hanging holes are arranged at two positions corresponding to and parallel to the two webs.

[0014] In the battery box of the utility model, the bottom plate mounting bracket is composed of a long hollow profile, one side of which is welded to the corresponding inner side of the web, and the end is connected to the end of the bottom plate mounting bracket on the adjacent web. The bottom surface is flush with the mounting surface of the lower mounting edge and is provided with a bottom plate edge mounting step for accommodating the edge of the bottom plate.

[0015] The utility model provides a technical solution to achieve its purpose: a battery system comprising a cover plate and a plurality of the aforementioned battery boxes; the battery boxes are stacked up and down, and the lower mounting edge of the upper battery box fits the upper mounting edge of the lower battery box; a sealing strip is placed on the sealing step at the top of each battery box; a plurality of battery modules are arranged in the battery box of each layer; the cover plate covers the upper side of the uppermost battery box and is fixedly connected to the upper mounting edge of the uppermost battery box by bolts at the four edges, and the battery boxes are fixedly connected by bolt assemblies in cooperation with the upper and lower mounting edges.

[0016] The technical solution of the utility model to achieve its purpose is: an electric vehicle, which has the above-mentioned battery system.

[0017] Compared with the prior art, the side plates of the battery box in the utility model are mainly made of thin plates, and the thin plates are formed by rolling or molding, which can effectively reduce the weight of the battery box and improve the energy density of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the battery system of the utility model.

[0019] Figure 2It is an exploded view of the battery system of the present utility model.

[0020] Figure 3 It is a schematic structural view of the battery box of the present utility model.

[0021] Figure 4 It is an exploded view of the battery box of the present utility model.

[0022] Figure 5 It is a sectional view of the battery box of the present utility model.

[0023] Figure 6 It is Figure 5 a partial enlarged view at position A in

[0024] Figure 7 It is a schematic view of the electric vehicle of the present utility model.

[0025] Names and serial numbers of components in the figure:

[0026] Battery system 100, control system 200, motor 300

[0027] Battery box 10, cover plate 20, short bolt assembly 30, long bolt assembly 40, sealing ring 50, battery module 60.

[0028] Left side plate 11, outer corner part 12, front side plate 13, bottom plate mounting bracket 14, right side plate 15, side main board 150, web 151, upper mounting edge 152, lower mounting edge 153, sealing step 154, inner corner part 16, rear side plate 17, bottom plate 18, steel pipe 19, channel-shaped bent plate 21, rivet nut 22, rivet 23, water pipe 24. Specific embodiments

[0029] The following describes the specific implementation manners in conjunction with the accompanying drawings.

[0030] Figures 3 to 6 The battery box 10 in an embodiment of the present utility model is shown. The battery box 10 includes a bottom plate 18 and four side plates. The four side plates are respectively a left side plate 11, a right side plate 15, a front side plate 13, and a rear side plate 17. A water pipe 24 for coolant to flow in and out, electrical connectors, high-voltage positive and negative connectors, etc. are installed on the front side plate 13.

[0031] As Figure 3 shown, each side plate includes a side main board 150 made of thin steel plate. The side main board 150 includes a vertical web 151, and upper and lower mounting edges 152 and 153 that are horizontally arranged corresponding to the upper and lower edges of the web 151. A plurality of coaxially arranged mounting holes are provided on the upper and lower mounting edges 152 and 153.

[0032] As Figure 4As shown, the left side plate 11, the right side plate 15, the front side plate 13, and the rear side plate 17 are arranged in a square frame shape, and the ends of the main side plates 150 on each side are welded to the ends of the adjacent main side plates 150; at the bottom of the inner side of the web 151 of each main side plate 150, a bottom plate mounting bracket 14 for fixedly connecting to the bottom plate is fixed.

[0033] As Figure 4 shown, at a position near the inner side of the upper mounting edge of each main side plate 150, a sealing step 154 lower than the upper mounting surface of the mounting edge and for placing a sealing strip is provided, and the sealing steps 154 on each main side plate 150 are flush and connected to the ends of the sealing steps 154 on the adjacent main side plates 150.

[0034] On the outside of the adjacent joints of the two main side plates 150, an outer corner piece 12 is fixed; the outer corner piece 2 is made by bending a square thin plate, and its four sides are respectively welded to the upper mounting edge 151, the lower mounting edge 152, and the two adjacent webs 151, and form a cavity with a right-angle bend on the outside of the connecting ends of the two main side plates 150. The outer corner piece 12 and the main side plate 150 form a double-layer structure at the corner of the battery box 10, strengthening the connection strength of the two main side plates and also improving the bearing capacity of the box.

[0035] Hanging holes are provided at two positions on the outer corner piece 12 corresponding to and parallel to the two webs 150. When lifting, the hanging holes are connected to the sling.

[0036] On the outside of the webs 151 of at least a pair of opposite main side plates 150, a plurality of web support members are fixed, and the upper and lower ends of each web support member are respectively fixedly connected to the upper and lower mounting edges.

[0037] As Figure 4 shown, web support members are provided in the left side plate 11 and the right side plate 15, and web support members can also be provided on the rear side plate 17. Inlet and outlet water pipes, electrical connectors, high-voltage positive and negative connectors, etc. are installed on the front side plate 13. When space permits, web support members can also be provided on the front side plate 13.

[0038] Optionally, the web support member is composed of a steel pipe 19, and the upper mounting edge 152 and the lower mounting edge 153 both have mounting holes coaxially aligned with the inner hole of the steel pipe 19. The upper and lower ends of the steel pipe 19 are welded to the upper mounting edge 152 and the lower mounting edge 153. When connecting two battery boxes 10, the bolt in the bolt assembly passes through the mounting holes on the upper and lower mounting edges and the inner hole of the steel pipe 18 to lock and fixedly connect the upper and lower battery boxes.

[0039] In some embodiments, the web support member may also be composed of a channel-shaped bent plate 21. The notch of the channel-shaped bent plate 21 is welded to the outer side surface of the web 151, and the upper and lower ends are correspondingly welded to the upper mounting edge 152 and the lower mounting edge 153. The channel-shaped bent plate 21 and the side main board 150 form a cylindrical closed structure, thereby effectively enhancing the strength and load-bearing capacity of the side main board 150. Optionally, the upper mounting edge 152 and the lower mounting edge 153 are provided with mounting holes opposite to the two ends of the web support member. When connecting two battery boxes, the bolts in the bolt assembly pass through the mounting holes on the upper mounting edge 152 and the lower mounting edge 153 and the grooves of the channel-shaped bent plate to lock and fixedly connect the upper and lower battery boxes.

[0040] In some embodiments, the web support member includes both a steel pipe 19 and a channel-shaped bent plate 21 at the same time. The steel pipe 19 is arranged in the groove of the channel-shaped bent plate 21, and its two ends are connected to the upper mounting edge 152 and the lower mounting edge 153, and the inner hole of the steel pipe 19 is coaxial with the corresponding mounting holes on the upper mounting edge 152 and the lower mounting edge 153. The notch of the channel-shaped bent plate 21 is welded to the outer side surface of the web 151, and the upper and lower ends are correspondingly welded to the upper mounting edge 152 and the lower mounting edge 153.

[0041] Optionally, as Figure 3 Figure 4 shown, inner corner pieces 16 are provided at the connection of the two webs 151. The inner corner pieces 16 are formed by bending a square thin plate at a right angle, and its two mutually perpendicular parts are correspondingly bonded and welded to the inner side surfaces of the two webs 151. The inner corner pieces 16 are used to improve the connection strength of the ends of the two side main boards 150.

[0042] The bottom plate mounting bracket 14 is composed of a long strip-shaped hollow profile. One side surface thereof is adhesively welded to the inner side surface of the corresponding web 151, the end is connected to the end of the bottom plate mounting bracket 14 on the adjacent web 151, and the bottom surface is flush with the mounting surface of the lower mounting edge and is provided with a bottom plate edge mounting step for accommodating the edge of the bottom plate 18.

[0043] As Figure 5 Figure 6 shown, the edge of the bottom plate 18 is located on the bottom plate edge mounting step and is fixedly connected to the bottom plate mounting bracket 14 through a rivet nut 22 and a rivet 23. The bottom plate can be a general metal plate or a liquid cooling plate with a cooling flow channel provided inside.

[0044] In this embodiment, the side main board, the outer corner piece 12, the inner corner piece 16, the support bent plate 21, etc. are all made of thin steel plates, and the thickness of the thin steel plates is 1.5 to 3 millimeters. The thin steel plates are formed into corresponding parts such as the side main board 150, the outer corner piece 12, the inner corner piece 16, the support bent plate 21, etc. by being roll-pressed by corresponding rollers and then cut to a fixed length, or are formed by die pressing after being cut.

[0045] This embodiment also discloses a battery system, asFigure 1 Figure 2 As shown, the battery system 100 includes a cover plate 20 and a plurality of the aforementioned battery boxes 10. A plurality of battery modules 60 are arranged in each layer of the battery boxes 10. The battery boxes 10 of each layer are stacked vertically, and the lower mounting edge 153 of the upper-layer battery box is attached to the upper mounting edge 152 of the lower-layer battery box; the mounting holes on the mutually attached upper mounting edge 152 and lower mounting edge 153 are coaxially aligned one by one.

[0046] Sealing strips are placed on the sealing steps at the top of each layer of the battery boxes 10, and the sealing strips on each side plate are connected to form a sealing ring 50; the lower mounting edge 153 of the upper-layer battery box 10 presses the sealing ring 50 into the sealing step at the top of the lower-layer battery box 10.

[0047] The cover plate 20 covers the upper side of the topmost layer of the battery boxes 10 and is fixedly connected to the upper mounting edge 152 of the topmost layer of the battery boxes 10 by bolts along the four peripheral edges. The battery boxes 10 are fixedly connected to each other through bolt assemblies in cooperation with the upper mounting edge 152 and the lower mounting edge 153.

[0048] There are two types of bolt assemblies for connecting the boxes. One is the short bolt assembly 30, which is used to connect the mutually attached upper mounting edge 152 and lower mounting edge 153. The other bolt assembly is the long bolt assembly 40, and its bolts pass through a plurality of upper mounting edges 152 and lower mounting edges 153.

[0049] This embodiment also discloses an electric vehicle having the aforementioned battery system 100. The electric vehicle can be a construction machine, such as a loader, an excavator, etc., or a road vehicle, such as a truck, a bus, etc. As Figure 7 shown, the battery system 100 is electrically connected to the motor 300 through the control system 200 to provide driving power for the motor 300.

[0050] In this embodiment, the side main board 150 of the battery box 10 is mainly made of thin steel plate, and the thin steel plate is formed by roll rolling or die pressing, which can effectively reduce the weight of the battery box 10 and improve the energy density of the battery system.

Claims

1. A battery box, characterized in that: It includes a bottom plate and four side plates, each side plate includes a side main plate made of a thin steel plate, and the side main plate includes a vertical web, and horizontally arranged mounting edges located at the upper and lower edges of the web; a plurality of upper and lower coaxial mounting holes are arranged on the upper and lower mounting edges; The four side plates are arranged in a square frame shape, and the end of each side main plate is welded to the end of the adjacent side main plate; the bottom of the inner side of the web of each side main plate is fixed with a bottom plate mounting bracket for fixed connection with the bottom plate; A sealing step is provided near the inner side of the upper mounting edge of each side main board, which is lower than the mounting surface on the mounting edge and is used to place the sealing strip. Each sealing step is flushly connected with the end of the sealing step on the adjacent side main board; External corner pieces are fixed on the outside of the adjacent joints of the two main boards; the external corner pieces are made by bending thin plates, and the four sides thereof are correspondingly welded to the upper and lower mounting edges and the two adjacent webs, and form a right-angled cavity with the two main boards at the outside of the connecting ends; A plurality of web support members are fixed to the outer sides of the webs of at least one pair of opposite side main boards, and the upper and lower ends of each web support member are fixedly connected to the upper and lower mounting edges respectively.

2. The battery box according to claim 1, characterized in that: The web support is made of a steel pipe, and the upper and lower mounting edges are provided with mounting holes coaxially aligned with the inner hole of the steel pipe.

3. The battery box according to claim 1, characterized in that: The web support member comprises a groove-shaped bent plate, the groove of which is welded to the outer side surface of the web, and the upper and lower ends are fixedly connected to the upper and lower mounting edges respectively.

4. The battery box according to claim 3, characterized in that: The upper and lower mounting edges are provided with mounting holes opposite to the two ends of the web support member.

5. The battery box according to claim 4, characterized in that: The web support also includes a steel pipe, which is arranged in the groove of the groove-shaped bent plate, with its two ends connected to the upper and lower mounting edges and the inner hole being coaxial with the corresponding mounting holes on the upper and lower mounting edges.

6. The battery box according to claim 1, characterized in that: The two webs are provided with inner corner pieces at the connection, the inner corner pieces are formed by bending at 90 degrees, and the two parts perpendicular to each other are correspondingly fitted and welded on the inner side surfaces of the two webs.

7. The battery box according to claim 1, characterized in that: The two positions of the outer corner piece corresponding to and parallel to the two webs are both provided with hanging holes.

8. The battery case according to any one of claims 1 to 7, characterized in that: The bottom plate mounting bracket is composed of a long hollow profile, one side of which is welded to the corresponding inner side of the web, and the end is connected to the end of the bottom plate mounting bracket on the adjacent web. The bottom surface is flush with the mounting surface of the lower mounting edge and is provided with a bottom plate edge mounting step for accommodating the edge of the bottom plate.

9. A battery system, characterized in that: It comprises a cover plate and a plurality of battery cases according to any one of claims 1 to 8; the battery cases are stacked up and down, and the lower mounting edge of the battery case of the upper layer fits with the upper mounting edge of the battery case of the lower layer; a sealing strip is placed on the sealing step on the top of each layer of battery cases; a plurality of battery modules are arranged in the battery case of each layer; the cover plate covers the upper side of the topmost layer of battery cases and is fixedly connected to the upper mounting edge of the topmost layer of battery cases by bolts along the four edges, and the battery cases are fixedly connected by bolt assemblies in cooperation with the upper and lower mounting edges.

10. An electric vehicle, characterized in that: A battery system as claimed in claim 9.

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