Lithium battery system for engineering machinery vehicle

Abstract

The utility model discloses a lithium battery system for an engineering machinery vehicle, which comprises a box body and a box cover, the box body and the box cover are butted, sealed and matched, the box cover comprises a connecting plate, a maintenance window and an accommodating bin are integrally arranged on the connecting plate, and the connecting plate is matched with a waterproof nut and is detachably matched with a flange of the box body; a maintenance cover is cooperatively arranged on the maintenance window; the containing bin and the box body are matched to form a double-layer structure with the through interior so as to contain components arranged in the box body. The electrical plug connector is arranged on the side edge of the accommodating bin, so that when the protection grade of the electrical plug connector reaches IP67, water attached to the electrical plug connector can be effectively prevented from seeping into the battery box along with the internal wire harness after the electrical plug connector is used for a long time, and the waterproof performance of the whole battery box is prevented from being damaged; and a waterproof nut 26 with a boss of 2.5 mm and a special sealing strip with the thickness of 5 mm are matched, so that the effective area of the compressed sealing strip reaches 50%, the risk of water leakage is reduced, and the remaining service life of the whole lithium battery system is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium batteries for vehicles, and in particular relates to a lithium battery system for engineering machinery vehicles. Background Art

[0002] At present, the protection level of lithium battery systems for engineering vehicles manufactured and used in China is mostly IP54. However, in reality, most engineering vehicles operate outdoors and are frequently exposed to rain and snow, and the protection of the entire vehicle is relatively simple. Therefore, IP54 still cannot ensure the safe operation of the lithium battery system. In most cases, an insulation fault will be reported, causing the battery system to automatically cut off power, affecting its use. Utility Model Content

[0003] In order to make up for the deficiencies of the prior art, the utility model provides a lithium battery system for an engineering machinery vehicle, so as to improve the protection level of the entire lithium battery system.

[0004] The lithium battery system for engineering machinery vehicles includes a box body and a box cover, which are butt-jointed and sealed. The box cover includes a connecting plate on which a maintenance window and a storage compartment are integrally provided. The connecting plate is detachably engaged with the flange of the box body by means of a waterproof nut; a maintenance cover is provided on the maintenance window; the storage compartment and the box body cooperate to form an internally connected double-layer structure to accommodate components arranged in the box body.

[0005] Furthermore, an electrical connector is provided on a side wall of the accommodating compartment adjacent to the maintenance window.

[0006] Furthermore, a sealing strip is provided between the maintenance window and the maintenance cover, and a handle is provided on the maintenance cover.

[0007] Furthermore, the box body and the box cover are sealed together by a sealing ring.

[0008] Furthermore, a mounting frame is provided on the inner wall of the box, and an electrical mounting plate and a module mounting plate are laid on the mounting frame. The electrical mounting plate is provided corresponding to the maintenance window for installing electrical components; the module mounting plate is provided corresponding to the accommodating compartment for installing battery modules; and the box below the electrical mounting plate and the module mounting plate is also used for laying battery modules.

[0009] Furthermore, lifting ears and lining blocks are provided on the corresponding two side outer walls of the box body, threaded holes are provided on the lining blocks for fixing to the whole vehicle, and lifting holes are provided on the lifting ears for lifting the box body; and a pressure relief valve is provided on one side wall.

[0010] Furthermore, a plurality of reinforcing ribs are provided at the bottom of the box.

[0011] Furthermore, the waterproof nut is a waterproof nut with a 2.5mm boss.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] (1) The electrical connector is arranged on the side of the storage compartment. While the protection level of the electrical connector itself reaches IP67, it can effectively prevent the water attached to the electrical connector from seeping into the battery box along with the internal wiring harness after a long period of use, thereby destroying the waterproof performance of the entire battery box; with a waterproof nut 26 with a 2.5mm boss and a 5mm thick special sealing strip, it is ensured that the effective area of ​​the sealing strip reaches 50% after compression, reducing the risk of water leakage and helping to extend the remaining service life of the entire lithium battery system.

[0014] (2) The present application has a simple structure and is easy to assemble. It adopts a waterproof design, and the protection level of the lithium battery system reaches IP67. Through reasonable layout, two upper and lower assembly areas are set up in the box body to avoid space waste. In addition, the storage compartment is integrated into the box cover, and the storage compartment and the box body form an internal through-double-layer structure, which increases the number of battery modules while reducing the structure of the entire battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the main structural diagram of the utility model;

[0016] Figure 2 This is a side structural diagram of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the utility model;

[0018] Figure 4 This is the bottom structure diagram of the utility model;

[0019] Figure 5 This is an explosion diagram of the utility model;

[0020] Figure 6 This is the internal structure diagram of the box of this utility model.

[0021] In the figure: 10-box, 11-mounting frame, 12-electrical installation plate, 13-module installation plate, 14-flange, 20-box cover, 21-connecting plate, 22-maintenance window, 23-accommodation compartment, 24-maintenance cover, 25-sealing strip, 26-waterproof nut, 27-handle, 30-electrical connector, 40-sealing ring, 50-lifting ear, 60-lining block, 70-reinforcement rib. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the present invention is further described below with reference to the accompanying drawings.

[0023] like Figures 1-6 The illustrated embodiment is a lithium battery system for engineering vehicles, comprising a housing 10 and a housing cover 20, which are butt-jointed and sealed. The housing cover 20 includes a connecting plate 21, integrally provided with a maintenance window 22 and a storage compartment 23. The connecting plate 21 is removably engaged with the flange 14 of the housing 10 by means of a waterproof nut 26. A maintenance cover 24 is provided on the maintenance window 22 to facilitate the installation and subsequent maintenance of components and wiring harnesses within the battery system. The storage compartment 23 cooperates with the housing 10 to form an internally connected double-layer structure to accommodate the components arranged within the housing 10. A sealing strip 25 is provided between the maintenance window 22 and the maintenance cover 24, and a handle 27 is provided on the maintenance cover 24 to facilitate opening the maintenance cover 24.

[0024] In this embodiment, an electrical connector 30 is provided on a side wall of the accommodating compartment 23 adjacent to the maintenance window 22, that is, the electrical connector 30 is provided on the side of the accommodating compartment 23. While the protection level of the electrical connector 30 itself reaches IP67, it effectively prevents water attached to the electrical connector 30 from seeping into the battery box along with the internal wiring harness after being used for too long, thereby destroying the waterproof performance of the entire battery box (when placed horizontally, it is difficult for water to penetrate into the battery box; the original electrical connector was set above the battery box, and because of the height difference, after a long time, water attached to the electrical connector is easy to seep into the battery system along with the internal wiring harness).

[0025] The box body 10 is 3mm thick and is welded using hem welding (the sheet metal edges are bent inward 20mm to increase the effective welding area). The exterior of the box body 10 is fully laser welded to further ensure waterproofing. The interior of the box body 10 is welded in sections using a double-sealed welding method to ensure overall structural strength. The box body 10 and the lid 20 are sealed together by a sealing ring 40. In this embodiment, both the sealing ring 40 and the sealing strip 25 are 5mm thick. The waterproof nut 26 has a 2.5mm boss.

[0026] It can be understood that the connections between the box body 10 and the box cover 20, and the maintenance window 22 and the maintenance cover 24 all adopt a flanged joint method, with a waterproof nut 26 with a 2.5mm boss and a 5mm thick special sealing strip to ensure that the effective area of ​​the sealing strip after compression reaches 50% (the original waterproof area with a 1.5mm boss and a 5mm thick sealing strip resulted in an effective area of ​​the sealing strip after compression of only 30%, which was prone to plastic deformation and caused waterproof failure).

[0027] Continue reading Figure 5 and Figure 6It can be seen that a mounting frame 11 is provided on the inner wall of the box body 10, on which an electrical mounting plate 12 and a module mounting plate 13 are laid. The electrical mounting plate 12 is provided corresponding to the maintenance window 22 and is used to install electrical components, including charging relays, discharge relays, fuses, shunts, BMS main control, 4G modules, pre-charge resistors, pre-charge relays, etc. The module mounting plate 13 is provided corresponding to the storage compartment 23 and is used to install battery modules; and the box body 10 below the electrical mounting plate 12 and the module mounting plate 13 is also used to lay battery modules. That is, the interior of the box body 10 is divided into two assembly areas, upper and lower, by the cooperation of the electrical mounting plate 12 and the module mounting plate 13. The battery modules are laid in the lower assembly area, and the electrical components and battery modules are laid in the upper assembly area.

[0028] Furthermore, the outer walls of the battery box 10 are provided with lifting ears 50 and pads 60 on the corresponding sides. The pads 60 have threaded holes for securing the battery box to the vehicle, and the lifting ears 50 have lifting holes for lifting the battery box 10. A pressure relief valve is installed on one side wall to ensure air circulation inside and outside the battery box. The bottom of the battery box 10 is equipped with several reinforcing ribs 70, each with weight-reducing holes to reduce weight.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lithium battery system for an engineering vehicle, comprising a box body (10) and a box cover (20), wherein the box body (10) and the box cover (20) are butt-jointed and sealed, and characterized in that: The box cover (20) includes a connecting plate (21), on which a maintenance window (22) and a storage compartment (23) are integrally provided. The connecting plate (21) is detachably engaged with a waterproof nut (26) and a flange (14) of the box body (10); a maintenance cover (24) is engaged with the maintenance window (22); and the storage compartment (23) and the box body (10) form an internally connected double-layer structure to accommodate components arranged in the box body (10).

2. The lithium battery system for construction machinery vehicles according to claim 1, characterized in that: An electrical connector (30) is provided on a side wall of the accommodating compartment (23) adjacent to the maintenance window (22).

3. The lithium battery system for construction machinery vehicles according to claim 1, characterized in that: A sealing strip (25) is provided between the maintenance window (22) and the maintenance cover (24), and a handle (27) is provided on the maintenance cover (24).

4. The lithium battery system for construction machinery vehicles according to claim 1, characterized in that: The box body (10) and the box cover (20) are sealed together via a sealing ring (40).

5. A lithium battery system for an engineering vehicle according to claim 1 or 4, characterized in that: The inner wall of the box body (10) is provided with a mounting frame (11), and an electrical mounting plate (12) and a module mounting plate (13) are arranged on the mounting frame (11). The electrical mounting plate (12) is arranged corresponding to the maintenance window (22) and is used for installing electrical components; the module mounting plate (13) is arranged corresponding to the accommodating compartment (23) and is used for installing battery modules; and the box body (10) below the electrical mounting plate (12) and the module mounting plate (13) is also used for laying battery modules.

6. The lithium battery system for construction machinery vehicles according to claim 5, characterized in that: The outer walls on both sides of the box body (10) are provided with lifting ears (50) and lining blocks (60), the lining blocks (60) are provided with threaded holes for fixing to the entire vehicle, and the lifting ears (50) are provided with lifting holes for lifting the box body (10); and a pressure relief valve is provided on one side wall.

7. The lithium battery system for construction machinery vehicles according to claim 5, characterized in that: A plurality of reinforcing ribs (70) are provided at the bottom of the box body (10).

8. The lithium battery system for construction machinery vehicles according to claim 5, characterized in that: The waterproof nut (26) is a waterproof nut with a 2.5 mm boss.

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