MTC large power battery system

Abstract

The utility model discloses an MTC (Machine Type Communication) large-scale power battery system, which comprises an upper box body assembly, a lower box body assembly and a power distribution unit (PDU) box cover, the upper box body unit comprises an upper box body and a first battery module arranged in the upper box body; the upper box body comprises a bottom plate and a side plate surrounding the periphery of the bottom plate, and the bottom plate is provided with a mounting port for a busbar to pass through; and the lower box body assembly is arranged at the bottom of the upper box body assembly and comprises a lower box body and a second battery module arranged in the lower box body. A multi-layer battery module assembly mode is established, high integration of batteries is realized, and the energy density of the system is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery module processing, in particular to an MTC large-scale power battery system. Background Art

[0002] MTC (Module to Chassis) technology is a design that integrates battery modules directly into the vehicle chassis. By optimizing the layout and mounting methods of the battery modules, this technology achieves a close integration of the battery and chassis, thereby improving the structural efficiency and safety of the entire vehicle. It is particularly applicable in the field of new energy vehicles.

[0003] At present, most of the new energy engineering machinery commonly seen on the market use standard box power batteries, but standard box power batteries can only be assembled into single-layer battery modules, and new energy engineering machinery simply relies on the stacking of standard boxes, resulting in a larger system size, low energy density, numerous wiring harnesses outside the box, and greatly reduced maintenance convenience. Utility Model Content

[0004] The purpose of this utility model is to provide an MTC large-scale power battery system, establish a multi-layer battery module assembly mode, achieve high battery integration, and greatly improve the energy density of the system.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] The utility model discloses an MTC large power battery system, comprising:

[0007] The upper box assembly includes a plurality of upper box units assembled in an upper and lower assembly, and a PDU cover disposed on the top of the uppermost upper box unit; the upper box unit includes an upper box body and a first battery module disposed within the upper box body; the upper box body includes a bottom plate and side plates surrounding the outer periphery of the bottom plate, the bottom plate having an installation opening for the busbar to pass through;

[0008] The lower box assembly is arranged at the bottom of the upper box assembly, and includes a lower box and a second battery module arranged in the lower box.

[0009] Each battery module is connected in series via a busbar to form a complete high-voltage circuit, ultimately outputting power to the vehicle through the PDU assembly on the PDU cover. Each layer of the box unit and the lower box assembly are bolted together to form a closed box assembly, with support castings installed outside the box to improve the structural reliability of the entire package.

[0010] A further solution: the upper box assembly further includes a first BMS slave device disposed on a side of the first battery module.

[0011] A further solution: the lower box assembly also includes a second BMS slave device arranged on the side of the second battery module.

[0012] The BMS slave is responsible for detecting the voltage, current, temperature and other status of the single battery and performing balancing control to ensure the overall performance and safety of the battery pack.

[0013] A further solution: a first inspection port is provided on the side of the side panel close to the installation port, and a second inspection port is provided on the side away from the installation port; a first inspection cover is provided on the top of the first inspection port; a second inspection cover is provided on the top of the second inspection port.

[0014] The second inspection port facilitates quick disconnection of the inter-layer busbar to facilitate later maintenance, and the first inspection port facilitates the inspection of the first BMS slave machine.

[0015] A further solution: the bottom plate and the bottom of the lower box body are both liquid cooling plates.

[0016] The liquid cooling plate effectively reduces the operating temperature of the battery module, extending battery life and improving vehicle performance. The upper housing is made of aluminum alloy, and the liquid cooling plate is also an extruded aluminum alloy profile. These are welded using TIG and FSW techniques to form an integrated liquid cooling system.

[0017] A further solution: the cross section of the upper box assembly is smaller than the cross section of the lower box assembly.

[0018] A further solution is that a mounting frame matching the bottom plate of the upper box body is provided on the lower box cover.

[0019] The outer frame of the installation frame is connected to the side plate of the upper box through bolts, and the busbar passing through the installation port opened on the liquid cooling plate of the lowest upper box is connected in series with the lower box.

[0020] A further solution is that a third inspection opening is provided on the lower box cover, and a third inspection cover plate is provided on the upper cover of the third inspection opening.

[0021] The third inspection cover facilitates the inspection of the second BMS slave and the quick disconnection of the busbar, facilitating subsequent maintenance.

[0022] A further solution: the upper box assembly and the lower box assembly are connected by a diagonal brace.

[0023] The two right-angled sides of the diagonal brace are respectively connected to the upper box assembly and the lower box assembly, which increases the connection rigidity of each layer of the box.

[0024] A further solution: the lower box body includes a lower box body body and a lower box cover arranged on the lower box body body.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] This utility model solves the problem that new energy engineering machinery cannot effectively improve energy density by using standard box solutions. By opening installation ports at the same position of each layer of box units for the threaded busbar to pass through, the upper and lower battery modules form a complete high-voltage circuit, which is ultimately output to the vehicle end through the PDU box cover. The upper and lower lines are screwed together to form a closed box assembly, and the mechanical reliability of the entire package is enhanced by reinforced castings such as diagonal braces. The integration of the box and the vehicle frame, the lightweight box, the integrated stacking of modules, and the reliable connection of the high-voltage circuit inside the box make the system have many advantages such as high energy density, high safety, and high reliability.

[0027] By reasonably opening an inspection port in the box, it is convenient to quickly cut off the bus connection between layers, facilitate the inspection of the BMS slave machine, and improve maintenance convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the utility model;

[0029] Figure 2 This is a schematic structural diagram of the utility model from another angle;

[0030] Figure 3 This is an exploded view of the structure of the utility model;

[0031] Figure 4 This is an exploded view of the structure of the utility model from another angle;

[0032] Figure 5 This is a schematic diagram of the upper box structure of the utility model;

[0033] Figure 6 This is a schematic diagram of the structure of the lower box body in the utility model;

[0034] In the figure: 1-upper box assembly, 2-upper box unit, 3-PDU box cover, 4-upper box, 5-first battery module, 6-bottom plate, 7-side plate, 8-mounting port, 9-lower box assembly, 10-lower box, 11-second BMS slave, 12-second battery module, 13-lower box body, 14-lower box cover, 15-mounting frame, 16-first inspection cover, 17-diagonal brace, 18-second inspection cover, 19-first BMS slave, 20-third inspection cover. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the product of the present invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0037] See also Figure 1-6 In this embodiment, a large MTC power battery system includes an upper box assembly 1 and a lower box assembly 9, wherein:

[0038] The upper box assembly 1 includes multiple upper box units 2 installed in an upper and lower combination, and a PDU box cover 3 arranged at the top of the upper box unit 2; the upper box unit 2 includes an upper box 4 and a first battery module 5 arranged in the upper box 4; the upper box 4 includes a bottom plate 6 and side plates 7 surrounding the outer periphery of the bottom plate 6, and the bottom plate 6 is provided with an installation opening 8 for the bus to pass through.

[0039] The lower box assembly 9 is arranged at the bottom of the upper box assembly 1, which includes a lower box 10 and a second battery module 12 arranged in the lower box 10; the lower box 11 includes a lower box body 13 and a lower box cover 14 covering the lower box body 13.

[0040] Each battery module is connected in series via a busbar to form a complete high-voltage circuit, ultimately outputting power to the vehicle through the PDU assembly on the PDU cover 3. Each layer of the box unit 2 and the lower box assembly 2 are screwed together to form a closed box assembly, with support castings installed outside the box to improve the structural reliability of the entire package.

[0041] Furthermore, the upper box assembly 1 also includes a first BMS slave 19 located on the side of the first battery module 5; the lower box assembly 9 also includes a second BMS slave 11 located on the side of the second battery module 12. The BMS slave is responsible for detecting the voltage, current, temperature and other conditions of the single battery cells and performing balancing control to ensure the overall performance and safety of the battery pack.

[0042] Furthermore, a first access opening is provided on the side of the side panel 7 near the mounting opening 8, and a second access opening is provided on the side away from the mounting opening 8. The first access opening is covered with a first access cover 16, and the second access opening is covered with a second access cover 18. The second access opening facilitates quick disconnection of the inter-layer busbar for later maintenance, while the first access opening facilitates maintenance of the first BMS slave.

[0043] Furthermore, the bottom plate 6 and the bottom of the lower box body 13 are both liquid cooling plates, which effectively reduce the operating temperature of the battery modules, extend battery life, and improve vehicle performance. The upper box body 4 is made of aluminum alloy, and the liquid cooling plate is also an aluminum alloy extrusion profile. Through TIG and FSW welding, it forms an integrated liquid cooling box.

[0044] Furthermore, the cross-section of the upper box assembly 1 is smaller than the cross-section of the lower box assembly 1, and a mounting frame 15 matching the upper box bottom plate 6 is provided on the lower box cover 14. The mounting frame 15 is provided with several criss-cross reinforcing ribs. The size of the mounting frame 15 matches the upper box unit 2. The outer frame of the mounting frame 15 is connected to the side panel of the upper box 4 by bolts, and the busbar passing through the mounting port 8 opened on the liquid cooling plate of the lowest upper box 4 is connected in series with the lower box 10.

[0045] Furthermore, a third inspection port is provided on the lower box cover 14 , and a third inspection cover plate 20 is provided on the upper cover of the third inspection port. The third inspection cover plate 20 facilitates the inspection of the second BMS slave and the quick disconnection of the busbar for subsequent inspection.

[0046] Furthermore, the upper box assembly 1 and the lower box assembly 9 are connected by a diagonal brace 22, and the two right-angled sides of the diagonal brace 22 are respectively connected to the upper box assembly 1 and the lower box assembly 9, thereby increasing the connection rigidity of each layer of the box.

[0047] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0048] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent modifications made according to the scope of the claims of the present application are within the scope of protection of the claims of the present application.

Claims

1. A large MTC power battery system, characterized in that: include: An upper box assembly (1) comprises a plurality of upper box units (2) assembled in an upper and lower manner, and a PDU box cover (3) arranged at the top of the upper box unit (2); the upper box unit (2) comprises an upper box (4) and a first battery module (5) arranged in the upper box (4); the upper box (4) comprises a bottom plate (6) and side plates (7) surrounding the outer periphery of the bottom plate (6); the bottom plate (6) is provided with an installation opening (8) for a busbar to pass through; The lower box assembly (9) is arranged at the bottom of the upper box assembly (1), and comprises a lower box (10) and a second battery module (12) arranged in the lower box (10).

2. The MTC large power battery system according to claim 1, characterized in that: The upper box assembly (1) further includes a first BMS slave (19) arranged on the side of the first battery module (5).

3. The MTC large power battery system according to claim 1, characterized in that: The lower box assembly (9) further includes a second BMS slave (11) disposed on the side of the second battery module (12).

4. The MTC large power battery system according to claim 1, characterized in that: The side panel (7) is provided with a first inspection opening on a side close to the installation opening (8), and a second inspection opening on a side away from the installation opening (8); the first inspection opening is covered with a first inspection cover plate (16); the second inspection opening is covered with a second inspection cover plate (18).

5. The MTC large power battery system according to claim 1, characterized in that: The bottom plate (6) and the bottom of the lower box body (13) are both liquid cooling plates.

6. The MTC large power battery system according to claim 1, characterized in that: The cross section of the upper box assembly (1) is smaller than the cross section of the lower box assembly (1).

7. The MTC large power battery system according to claim 6, characterized in that: The lower box cover (14) is provided with a mounting frame (15) that matches the upper box bottom plate (6).

8. The MTC large power battery system according to claim 1, characterized in that: A third inspection opening is provided on the lower box cover (14), and a third inspection cover plate (20) is provided on the upper cover of the third inspection opening.

9. The MTC large power battery system according to claim 1, characterized in that: The upper box assembly (1) and the lower box assembly (9) are connected via a diagonal brace (22).

10. The MTC large power battery system according to claim 1, characterized in that: The lower box body (11) comprises a lower box body (13) and a lower box cover (14) arranged on the lower box body (13).

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