Power battery system and engineering machinery

Abstract

The utility model discloses a power battery system and engineering machinery, and the power battery system comprises a first battery frame, a second battery frame and a third battery frame which are separated from one another, are installed at the rear part of a rotary platform, and provide electric energy for the engineering machinery to drive a motor; a plurality of battery support plates for mounting battery packs are horizontally arranged on the first battery frame, the second battery frame and the third battery frame respectively, and the same number of battery packs are uniformly arranged on the first battery frame, the second battery frame and the third battery frame; wherein the first battery frame is located behind a cab, and the height of the first battery frame is lower than the sight height of a driver in the cab; the uppermost layer of the second battery frame is provided with a first supporting plate for mounting a battery heat dissipation system; and a second supporting plate for mounting a high-voltage junction box is arranged on the uppermost layer of the third battery frame. And a battery frame split and layered layout scheme is adopted, so that the overall stability of the engineering machinery power battery system is improved.

Description

Technical Field

[0001] The utility model belongs to the field of engineering machinery and relates to a power battery system and engineering machinery. Background Art

[0002] In recent years, the world has been focusing on developing emerging industries related to new energy. For example, the technologies of a series of new energy electric vehicles and buses launched in the automotive industry have gradually matured.

[0003] However, the development of new energy technologies in the construction machinery industry is still in its early stages. The electric construction machinery currently launched by various manufacturers, such as electric excavators, are mainly rechargeable excavators. The power required for electric construction machinery is usually much higher than that required for electric vehicles, and the batteries are prone to failure or even scrapping when hit. Therefore, the main difficulty in its development and design lies in the high requirements for the layout of the battery pack, the reliability of the fixed structure, and the stability of the entire battery system. Utility Model Content

[0004] Purpose: To overcome the deficiencies of the prior art, the utility model provides a power battery system and engineering machinery to improve the overall stability of the power battery system of the engineering machinery.

[0005] Technical solution: To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] According to a first aspect of the utility model, a power battery system is provided, the power battery system comprising a first battery frame, a second battery frame and a third battery frame which are separated from each other and installed at the rear of a rotary platform to provide electric energy for an engineering machine to drive a motor;

[0007] A plurality of battery support plates for mounting battery packs are horizontally arranged on the first battery frame, the second battery frame and the third battery frame, and the same number of battery packs are evenly arranged;

[0008] The first battery frame is located behind the cab, and the height of the first battery frame is lower than the sight height of the driver in the cab;

[0009] The uppermost layer of the second battery frame is provided with a first support plate for mounting a battery cooling system;

[0010] The uppermost layer of the third battery frame is provided with a second supporting plate for mounting a high-voltage junction box.

[0011] In some embodiments of the present invention, the first battery frame, the second battery frame and the third battery frame are all cubic frames, and the four corners of the battery support plate are connected and installed at the corresponding four corners of the battery frame through connectors and shock absorbers.

[0012] Furthermore, in some embodiments of the present invention, at least one weight-reducing hole is opened in the middle of the battery support plate.

[0013] Furthermore, in some embodiments of the present invention, reinforcing ribs are provided on both sides of the bottom of the battery support plate along its length direction.

[0014] In some embodiments of the present invention, the first battery frame, the second battery frame and the third battery frame each include four vertically arranged frame bending plates and a plurality of horizontally arranged frame reinforcement beams, and both ends of the frame reinforcement beams are respectively connected to two adjacent frame bending plates.

[0015] In some embodiments of the present invention, the frame bending plates of the first battery frame, the second battery frame and the third battery frame are provided with water pipe holes for passing through heat dissipation water pipes, and wire holes for passing through high-voltage wire harnesses.

[0016] In some embodiments of the present invention, at least one rectangular weight-reducing hole is provided on the second support plate.

[0017] In some embodiments of the present invention, an L-shaped reinforcement rib and a reinforcement plate are provided at the bottom of the second support plate, wherein the reinforcement plate is arranged along the length direction of both sides of the bottom of the second support plate, and the L-shaped reinforcement rib is arranged along the width direction of the second support plate, and the two ends of the L-shaped reinforcement rib are respectively connected to the inner side of the reinforcement plate.

[0018] Furthermore, in some embodiments of the present invention, the first battery frame, the second battery frame and the third battery frame are arranged along the width direction of the engineering machinery, and their heights increase sequentially.

[0019] According to a second aspect of the present invention, there is provided an engineering machine comprising the power battery system described in the first aspect.

[0020] Beneficial effects: The utility model provides a power battery system and engineering machinery, which have the following advantages: the battery frame is split and layered, and the battery cooling system and high-voltage junction box are fixed above the battery frame. The height of the frame directly behind the cab is lowered, which improves the driver's field of vision in the cab and effectively avoids the center of gravity shift of the whole machine; the overall shock absorption is changed to layered shock absorption, which greatly improves the stability; the high-voltage junction box is adjusted to the top of the frame, which reduces the cost of the high-voltage wiring harness, and the wiring harness layout is neat and beautiful. This technical solution can greatly improve the safety and reliability of the battery system and the stability of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a power battery system in the prior art;

[0022] Figure 2 and Figure 3 This is a schematic diagram of the structure of a power battery system according to an embodiment of the utility model;

[0023] Figure 4 and Figure 5 This is a schematic structural diagram of a second battery frame according to an embodiment of the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of a battery support plate according to an embodiment of the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of a third battery frame according to an embodiment of the utility model;

[0026] Figure 8 This is a schematic structural diagram of a second support plate according to an embodiment of the utility model;

[0027] In the figure: a first battery frame 1, a second battery frame 2, a third battery frame 3; a first support plate 20, a frame bending plate 21, a frame reinforcement beam 22, a frame reinforcement plate 23; a battery support plate 24, a reinforcement rib 240; a shock absorber 25; a second support plate 30, an L-shaped reinforcement rib 300, a reinforcement plate 301. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only used to explain the relative positional relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0031] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0033] The battery system of early electric engineering machinery has a two-row multi-layer layout structure. Rectangular tubes are welded around to form a frame structure. Each layer of battery pack is rigidly connected and directly fixed to the support frame, which is bolted to the frame side beam. The overall battery system adopts overall shock absorption measures, and large shock absorbers are added at the four corners of the bottom to ensure the safety of the battery pack. Figure 1 As shown. This technical solution has the following defects: the heat dissipation system required by the battery system needs to be considered separately, and it is far away from the installation position of the high-voltage junction box, and the cost of the high-voltage wiring harness is relatively high; the total height of the battery frame is too high, blocking the driver's rear view in the cab, and the overall shock absorption method is adopted, the overall shaking is large, especially the upper part of the frame, the visual sense is obvious, and the overall frame cannot be placed on the center line of the whole machine, and the center of gravity of the whole machine cannot be guaranteed, which greatly reduces the stability and safety.

[0034] To this end, the present application provides a power battery system that adopts a split and layered layout of the battery frame, and fixes the battery cooling system and the high-voltage junction box above the battery frame. The height of the frame directly behind the cab is lowered to improve the driver's field of vision in the cab and effectively avoid the center of gravity shift of the whole machine; the overall shock absorption is changed to layered shock absorption, which greatly improves stability; the position of the high-voltage junction box is adjusted to the top of the frame, reducing the cost of the high-voltage wiring harness, and the wiring harness layout is neat and beautiful. This technical solution can greatly improve the safety and reliability of the battery system and the stability of the whole machine.

[0035] In one possible application scenario, the power battery system in this embodiment is used in an electric excavator and is installed at the rear of a rotary platform to provide electrical energy for the excavator to drive the motor.

[0036] like Figure 2 , Figure 3 As shown, a power battery system for engineering machinery includes a first battery frame 1, a second battery frame 2 and a third battery frame 3 which are separated from each other and installed at the rear of a rotary platform to provide electric energy for the engineering machinery to drive the motor;

[0037] A plurality of battery support plates 24 for mounting battery packs are horizontally arranged on the first battery frame 1, the second battery frame 2 and the third battery frame 3, respectively, and the same number of battery packs are evenly arranged;

[0038] The first battery frame 1 is located behind the cab, and the height of the first battery frame 1 is lower than the sight height of the driver in the cab;

[0039] The uppermost layer of the second battery frame 2 is provided with a first support plate 20 for installing a battery cooling system;

[0040] The uppermost layer of the third battery frame 3 is provided with a second support plate 30 for mounting a high-voltage junction box.

[0041] In this application, a split and layered layout of the battery frame is adopted, and the battery cooling system and the high-voltage junction box are fixed above the battery frame. In some specific applications, the overall battery system frame is divided into a first battery frame 1, a second battery frame 2, and a third battery frame 3. Four battery packs are arranged on each battery frame to avoid the center of gravity of the whole machine from shifting. The frame height changes sequentially, and the battery frame behind the cab has the lowest height, thereby solving the problem of blocking the field of view in the original solution. Each battery frame is designed with a high-strength bottom plate that is directly fixed to the slewing platform by bolts.

[0042] In the present application, the frame structures of the first battery frame 1, the second battery frame 2 and the third battery frame 3 are basically the same, and the first battery frame 1, the second battery frame 2 and the third battery frame 3 are all cubic frames; in addition to being based on the first battery frame 1, the top layer of the second battery frame 2 is provided with a first support plate 20 for installing a battery cooling system; the top layer of the third battery frame 3 is provided with a second support plate 30 for installing a high-voltage junction box.

[0043] In some embodiments, Figure 2 , Figure 3 As shown, the first battery frame 1, the second battery frame 2 and the third battery frame 3 are arranged along the width direction of the engineering machinery, and their heights increase successively.

[0044] The following specifically describes the structural composition of the second battery frame 2 and the third battery frame 3. In some embodiments, the second battery frame 2 is taken as an example. Figure 4 , Figure 5 As shown, the second battery frame 2 battery frame includes four vertically arranged frame bending plates 21 and a plurality of horizontally arranged frame reinforcement beams 22, and the two ends of the frame reinforcement beam 22 are respectively connected to two adjacent frame bending plates 21; thereby forming a layered cubic frame structure.

[0045] Furthermore, in some embodiments, a frame reinforcing plate 23 is further provided at the connection between the frame bending plate 21 and the frame reinforcing beam 22. Figure 4 As shown, the frame reinforcement plate 23 is a right-angled triangle plate structure, wherein one right-angle side of the frame reinforcement plate 23 is connected to the frame bending plate 21, and the other right-angle side is connected to the corresponding frame reinforcement plate 23. More specifically, in some practical applications, the battery frame is welded by the bending plate 21, the reinforcement beam 22, and the reinforcement plate 23.

[0046] like Figure 5 As shown, the four corners of the battery support plate 24 are connected and installed at the corresponding four corners of the battery frame through connectors and shock absorbers 25 respectively.

[0047] More specifically, in some practical applications, the connecting member may be a bolt, and the four corners of each layer of battery support plate 24 are respectively installed at the four corners of the battery frame by bolts and shock absorbers 25. In this application, the battery shock absorption adopts layered shock absorption, and shock absorbers 25 are added at the four corners below each layer of battery support plate. This makes each battery frame have better shock absorption performance.

[0048] In some embodiments, Figure 6As shown, at least one weight-reducing hole is opened in the middle of the battery support plate 24; this technical solution is to reduce the weight of the battery support plate. Further, in this embodiment, there are 4 weight-reducing holes, all of which are rounded square holes.

[0049] In some embodiments, Figure 6 As shown, in order to reduce weight while ensuring the supporting strength of the battery support plate 24 , reinforcing ribs 240 are provided on both sides of the bottom of the battery support plate 24 along its length direction.

[0050] In some embodiments, the frame bending plates 21 of the first battery frame 1, the second battery frame 2 and the third battery frame 3 are provided with water pipe holes for the passage of heat dissipation water pipes, and wire holes for the passage of high-voltage wire harnesses, wherein the heat dissipation water pipes are used to water-cool the battery packs at corresponding positions, and each battery pack is connected to a high-voltage junction box via a high-voltage wire harness.

[0051] In some embodiments, Figure 7 , Figure 8 As shown, at least one rectangular weight-reducing hole is provided on the second support plate 30. This technical solution is to reduce the weight of the second support plate 30. Further, in this embodiment, there are 4 rectangular weight-reducing holes, all of which are rounded rectangular holes.

[0052] In some embodiments, Figure 8 As shown, in order to reduce weight while ensuring the supporting strength of the second support plate 30, an L-shaped reinforcement rib 300 and a reinforcement plate 301 are provided at the bottom of the second support plate 30, wherein the reinforcement plate 301 is arranged along the length direction of the second support plate 30, and the L-shaped reinforcement rib 300 is arranged along the width direction of the second support plate 30, and the two ends of the L-shaped reinforcement rib 300 are respectively connected to the inner side of the reinforcement plate 301.

[0053] An engineering machine includes the above-mentioned power battery system. In some embodiments, the engineering machine is an electric excavator. Figure 3 As shown, the three battery frames are designed with high-strength bottom plates and are fixed to the rear of the rotating platform by bolts.

[0054] In summary, the utility model provides a power battery system for engineering machinery, with a new structure and layout design. The overall frame is changed to a split form, the height of the frame directly behind the cab is lowered, the driver's field of vision is improved, and the center of gravity of the whole machine is effectively avoided from shifting; the overall shock absorption is changed to layered shock absorption, which greatly improves the stability; the high-voltage junction box is adjusted to the top of the frame, the cost of the high-voltage wire harness is reduced, and the layout of the wire harness is neat and beautiful. This technical solution can greatly improve the safety and reliability of the battery system and the stability of the whole machine.

[0055] The technical means disclosed in the scheme of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above-mentioned technical features. The above has disclosed the utility model with preferred embodiments, but it is not used to limit the utility model. Any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A power battery system for construction machinery, characterized in that: The power battery system includes a first battery frame, a second battery frame and a third battery frame which are separated from each other and installed at the rear of the rotary platform to provide electric energy for the engineering machinery to drive the motor; A plurality of battery support plates for mounting battery packs are horizontally arranged on the first battery frame, the second battery frame and the third battery frame, and the same number of battery packs are evenly arranged; The first battery frame is located behind the cab, and the height of the first battery frame is lower than the sight height of the driver in the cab; The uppermost layer of the second battery frame is provided with a first support plate for mounting a battery cooling system; The uppermost layer of the third battery frame is provided with a second supporting plate for mounting a high-voltage junction box.

2. The power battery system according to claim 1, characterized in that: The first battery frame, the second battery frame and the third battery frame are all cubic frames, and the four corners of the battery support plate are connected and installed at the corresponding four corners of the battery frame through connectors and shock absorbers.

3. The power battery system according to claim 2, characterized in that: At least one weight-reducing hole is opened in the middle of the battery support plate.

4. The power battery system according to claim 3, characterized in that: Reinforcing ribs are arranged on both sides of the bottom of the battery support plate along its length direction.

5. The power battery system according to claim 1, characterized in that: The first battery frame, the second battery frame and the third battery frame each include four vertically arranged frame bending plates and a plurality of horizontally arranged frame reinforcement beams, and two ends of the frame reinforcement beams are respectively connected to two adjacent frame bending plates.

6. The power battery system according to claim 1, characterized in that: The frame bending plates of the first battery frame, the second battery frame and the third battery frame are provided with water pipe holes for the heat dissipation water pipes to pass through, and wire holes for the high-voltage wire harnesses to pass through.

7. The power battery system according to claim 1, characterized in that: At least one rectangular weight-reducing hole is disposed on the second support plate.

8. The power battery system according to claim 7, characterized in that: The bottom of the second support plate is provided with an L-shaped reinforcement rib and a reinforcement plate, wherein the reinforcement plate is arranged along the length direction of both sides of the bottom of the second support plate, the L-shaped reinforcement rib is arranged along the width direction of the second support plate, and the two ends of the L-shaped reinforcement rib are respectively connected to the inner side of the reinforcement plate.

9. The power battery system according to any one of claims 1 to 8, characterized in that: The first battery frame, the second battery frame and the third battery frame are arranged along the width direction of the engineering machinery, and their heights increase successively.

10. An engineering machine, characterized in that: A power battery system comprising any one of claims 1 to 9.

Images