Battery pack, battery system and engineering machinery

Abstract

The invention discloses a battery pack, a battery system and engineering machinery, and the battery pack comprises a box body (1) which comprises a bottom plate (11), a plurality of side plates which are vertically arranged on the bottom plate (11) and are detachably connected with the bottom plate (11), and a top plate (15) which covers the side plates and is detachably connected with the side plates; the first battery module assembly (2) comprises a first tray (21) and a plurality of first battery cell modules; the first tray (21) is stacked on the bottom plate (11) and is detachably connected with the bottom plate (11); the plurality of first battery cell modules are arranged on the first tray (21).

Description

Technical Field

[0001] The present invention relates to the field of engineering machinery, and in particular to a battery pack, a battery system and engineering machinery. Background Art

[0002] At present, for large-scale construction machinery, such as loaders and graders of dozens of tons and mining trucks of hundreds of tons, the power required for the whole machine ranges from one thousand to three thousand kWh, and the voltage platform is also above 800V. This requires the number of battery cells connected in series to be more than 250, and the operating conditions of these large-scale construction machinery are relatively harsh, which requires higher structural strength of the battery pack.

[0003] In order to meet the requirements of large-capacity, high-voltage complete battery systems, the number of battery packs that need to be connected in series and parallel increases for traditional small-capacity and low-voltage single battery packs, and the number of battery packs that need to be connected may reach dozens or more. For such a large battery system, its assembly processability and maintainability become increasingly complicated, and the installation bracket of such a large battery system is also relatively complicated, occupying a larger space in the entire vehicle. Summary of the invention

[0004] The present invention aims to provide a battery pack and a battery system which are beneficial to improving strength.

[0005] According to one aspect of an embodiment of the present invention, the present invention provides a battery pack, the battery pack comprising:

[0006] The box body comprises a bottom plate, a plurality of side plates erected on the bottom plate and respectively connected to the bottom plate in a detachable manner, and a top plate covering the plurality of side plates and respectively connected to the plurality of side plates in a detachable manner; and

[0007] The first battery module assembly includes a first tray stacked on the bottom plate and detachably connected to the bottom plate and a plurality of first battery cell modules arranged on the first tray.

[0008] In some embodiments, the battery pack also includes a second battery module assembly disposed above the first battery module assembly, the second battery module assembly includes a second tray stacked on the first battery module assembly and a plurality of second battery cell modules disposed on the second tray, and the second tray is connected to the first tray.

[0009] In some embodiments, the first tray is connected to the bottom plate by a plurality of bottom plate connecting screw members, and the plurality of bottom plate connecting screw members are arranged along an edge of the first tray.

[0010] In some embodiments,

[0011] The first tray includes a first tray body and a first frame arranged above the first tray body, and the tray body protrudes from the frame at both ends of the first tray in the longitudinal direction.

[0012] The bottom plate connecting screw member comprises a first screw connecting member and a second screw connecting member which respectively connect two parts of the first tray body which protrude from the frame in the longitudinal direction and the bottom plate.

[0013] In some embodiments, the threaded member connecting the base plate includes a third threaded connector connecting one lateral end of the first pallet and the base plate, a recessed portion is provided on the side of the first pallet along the lateral end of the first pallet perpendicular to the base plate, and a third threaded connector mounting hole matching the third threaded connector is provided on the bottom surface of the recessed portion parallel to the base plate.

[0014] In some embodiments, the second pallet and the first pallet are connected by a plurality of first pallet connecting screws, and the plurality of first pallet connecting screws are arranged along an edge of the second pallet.

[0015] In some embodiments, the first pallet connecting screw member includes a fourth screw connection member and a fifth screw connection member respectively connecting two ends of the second pallet in the longitudinal direction of the second pallet and the first pallet.

[0016] In some embodiments, the first pallet connecting screw member includes a sixth screw connection member connecting a transverse end of the second pallet and the first pallet.

[0017] In some embodiments,

[0018] The first pallet includes a first pallet body, a first frame provided on the first pallet body, and a first crossbeam extending in the transverse direction of the first pallet, wherein both ends of the first crossbeam are respectively connected to the first frame;

[0019] The second pallet includes a second pallet body, a second frame provided on the second pallet body, and a second crossbeam extending in the transverse direction of the second pallet, wherein both ends of the second crossbeam are respectively connected to the second frame;

[0020] The first tray connecting screw member includes a seventh screw connection member connecting the second beam and the first beam.

[0021] In some embodiments,

[0022] The first tray also includes a first longitudinal beam extending in the longitudinal direction of the first tray, two ends of the first longitudinal beam are respectively connected to the first frame, and the first longitudinal beam intersects with the first transverse beam;

[0023] The second tray also includes a second longitudinal beam extending in the longitudinal direction of the second tray, two ends of the second longitudinal beam are respectively connected to the second frame, and the second longitudinal beam intersects with the second transverse beam;

[0024] The first pallet connecting screw member includes an eighth screw connection member connecting the second longitudinal beam and the first longitudinal beam.

[0025] In some embodiments, the battery pack also includes a third battery module assembly arranged above the first battery module assembly, the side plate includes a first side plate and a second side plate opposite to the first side plate, the inner surface of the first side plate and the inner surface of the second side plate are respectively provided with a first support component and a second support component, and the third battery module assembly is placed on the first support component and the second support component.

[0026] In some embodiments,

[0027] The first supporting member is provided with a first mounting hole for connecting the third battery module assembly;

[0028] The second supporting component is provided with a second mounting hole for connecting the third battery module assembly.

[0029] In some embodiments, the third battery module assembly includes a third tray and a third battery cell module disposed on the third tray, and the third tray is connected to the first supporting component and the second supporting component through the first mounting hole and the second mounting hole, respectively.

[0030] According to another aspect of the present invention, a battery system is further provided. In some embodiments, the battery system includes a battery pack group, the battery pack group includes multiple layers of battery packs, and each layer of battery packs includes the multiple battery packs mentioned above arranged side by side.

[0031] In some embodiments, the battery system further includes a clamping bracket disposed on a side of the battery pack and a clamping component connecting the clamping bracket and a side plate of the battery pack.

[0032] In some embodiments,

[0033] The clamping component comprises a pin shaft, a flange connected to one end of the pin shaft and a clamping bolt, wherein the flange is provided with a first bolt hole allowing the clamping bolt to pass through;

[0034] The clamping bracket is provided with a pin hole for allowing the pin to pass through and a second bolt hole for allowing the clamping bolt to pass through;

[0035] The side plate is provided with a clamping bracket connection hole, which includes a threaded hole adapted to the clamping bolt.

[0036] The pin passes through the pin hole on the clamping bracket and abuts or connects with the side plate of the battery pack. The flange is arranged on the side of the clamping bracket away from the battery pack. The clamping bolt passes through the first bolt hole and the second bolt hole and is threadedly connected with the threaded hole.

[0037] In some embodiments, the clamping bracket connection hole also includes a pin connection hole connected to the pin.

[0038] According to another aspect of the present invention, there is provided a construction machine comprising the above-mentioned battery system.

[0039] By applying the technical solution of the present invention, the first tray is connected to the bottom plate of the box body as a whole, which is beneficial to improving the structural strength of the battery pack and preventing the battery module assembly from shaking in the box body, thereby improving the strength and safety of the battery pack.

[0040] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0042] Figure 1 A schematic diagram showing the structure of a battery pack according to an embodiment of the present invention is shown;

[0043] Figure 2 A schematic diagram showing the exploded structure of a box of a battery pack according to an embodiment of the present invention is shown;

[0044] Figure 3 A schematic diagram showing the structure of a bottom plate of a box body of a battery pack according to an embodiment of the present invention;

[0045] Figure 4 A schematic diagram showing the three-dimensional structure of a first side plate of a box body of a battery pack according to an embodiment of the present invention is shown;

[0046] Figure 5 A schematic diagram of the three-dimensional structure of the first side plate of the box body of the battery pack according to an embodiment of the present invention is shown at another angle;

[0047] Figure 6 A schematic diagram showing the three-dimensional structure of a third side plate of a box body of a battery pack according to an embodiment of the present invention is shown;

[0048] Figure 7 A schematic diagram of the three-dimensional structure of the third side plate of the box body of the battery pack of the embodiment of the present invention is shown from another angle;

[0049] Figure 8 A partial enlarged structural schematic diagram of the third side plate A of the box body of the battery pack of the embodiment of the present invention is shown;

[0050] Fig. 9 A schematic diagram showing the three-dimensional structure of the top plate of the box body of the battery pack according to an embodiment of the present invention is shown;

[0051] Fig.10A schematic diagram showing the structure of multiple battery module assemblies inside a battery pack according to an embodiment of the present invention is shown;

[0052] Fig.11 A schematic diagram showing the three-dimensional structure of a first tray of a first battery module assembly inside a battery pack according to an embodiment of the present invention is shown;

[0053] Fig.12 A schematic diagram showing the three-dimensional structure of a battery system according to an embodiment of the present invention is shown;

[0054] Fig.13 A schematic diagram showing the three-dimensional structure of a clamping component of a battery system according to an embodiment of the present invention; and

[0055] Fig.14 A schematic flow chart of the assembly process of a battery pack according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0056] 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 described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0058] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0059] In the description of the present invention, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate positions or positional relationships 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0060] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0061] If there is no special explanation, the "include" and "comprising" mentioned in the present invention represent open-ended or closed-ended expressions. For example, the "include" and "comprising" may represent that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0062] If not specifically stated, in the present invention, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0063] like Figures 1 to 2 and Fig.10 As shown, the battery pack of this embodiment includes a box body 1 and a first battery module assembly 2. The box body 1 includes a bottom plate 11, a plurality of side plates erected on the bottom plate 11 and detachably connected to the bottom plate 11, and a top plate 15 covered on the plurality of side plates and detachably connected to the plurality of side plates. The first battery module assembly 2 includes a first tray 21 stacked on the bottom plate 11 and detachably connected to the bottom plate 11 and a plurality of first battery cell modules arranged on the first tray 21.

[0064] In this embodiment, the first tray 21 is connected to the bottom plate 11 of the box body 1 as a whole, which is beneficial to improving the structural strength of the battery pack and preventing the battery module assembly from shaking in the box body 1, so as to improve the strength and safety of the battery pack.

[0065] Furthermore, in an embodiment of the present invention, the box body 1 is an assembled box body, so the first tray 21 can be first connected to the bottom plate 11 of the box body 1 to facilitate the installation of the first battery cell module on the first tray 21, and then the side panels and the top panel 15 can be installed on the bottom plate 11, which is beneficial to improving the convenience and efficiency of assembly.

[0066] Referring to FIG. 10 , the battery pack further includes a second battery module assembly 3 disposed above the first battery module assembly 2. The second battery module assembly 3 includes a second tray 31 stacked on the first battery module assembly 2 and a plurality of second battery cell modules disposed on the second tray 31. The second tray 31 is connected to the first tray 21.

[0067] In this embodiment, multiple layers of battery module assemblies can be stacked in the battery pack box 1, each battery module assembly includes multiple battery cell modules, and the second battery module assembly 3 is directly stacked above the first battery module assembly 2, which is beneficial to saving space, reducing the volume of the battery pack, and improving the energy density of the battery pack.

[0068] The first tray 21 is connected to the bottom plate 11 via a plurality of bottom plate connecting screws, which are arranged along the edge of the first tray 21, thereby ensuring the stability of the connection between the first tray 21 and the bottom plate 11, thereby preventing the first battery module assembly 2 from shaking relative to the box body 1 and ensuring the stability and safety of the battery module assembly.

[0069] The first pallet 21 includes a first pallet body and a first frame arranged above the first pallet body. The tray body protrudes from the frame at both ends of the longitudinal direction of the first pallet 21 respectively. The bottom plate threaded member includes a first threaded connector 22 and a second threaded connector 23 that respectively connect the two parts of the first pallet body that protrude from the frame in the longitudinal direction and the bottom plate 11. The two ends of the first pallet body along the longitudinal direction are respectively connected to the bottom plate 11, which is beneficial to improving the stability of the first battery module assembly 2.

[0070] See also Fig.10 and Fig.11The bottom plate threaded member includes a third threaded connector 24 connecting one end of the first tray 21 along the lateral direction of the first tray 21 and the bottom plate 11. A recessed portion 218 is provided on the side perpendicular to the bottom plate 11 of one end of the first tray 21 along the lateral direction of the first tray 21. A third threaded connector mounting hole matching the third threaded connector 24 is provided on the bottom surface of the recessed portion 218 parallel to the bottom plate 11. The recessed portion 218 for mounting the third threaded connector 24 is provided on the end surface of one lateral end of the first tray 21. Compared with providing a protruding portion for mounting the third threaded connector 24, it is beneficial to reduce the lateral size of the first tray 21, reduce the volume of the battery pack, and improve the energy density of the battery pack.

[0071] In some embodiments, the second tray 31 and the first tray 21 are connected by a plurality of first tray connecting screws, and the plurality of first tray connecting screws are arranged along the edge of the second tray 31. The second battery module assembly 3 is connected as a whole through the first battery module assembly 2 and the box body 1, which is conducive to improving the stability and safety of the battery module in the battery pack.

[0072] The first pallet connecting screws include a fourth screw connection member 32 and a fifth screw connection member 33 that respectively connect both ends of the second pallet 31 in the longitudinal direction of the second pallet 31 and the first pallet 21 .

[0073] In some embodiments, the first tray connecting screw member includes a sixth screw connection member 34 connecting one end of the second tray 31 in the lateral direction of the second tray 31 and the first tray 21 .

[0074] The fourth threaded connector 32 and the fifth threaded connector 33 are respectively connected to the first tray 21 at both longitudinal ends of the second tray 31, and the sixth threaded connector 34 are respectively connected to the first tray 21 at both lateral ends of the second tray 31, thereby improving the stability and safety of the second battery module assembly 3.

[0075] See also Fig.10 and 11 The first tray 21 includes a first tray body, a first frame provided on the first tray body and a first crossbeam 216 extending in the transverse direction of the first tray 21, and two ends of the first crossbeam 216 are respectively connected to two side frames of the first frame which are respectively located at two ends of the transverse direction of the first tray 21 and are opposite to each other; the second tray 31 includes a second tray body, a second frame provided on the second tray body and a second crossbeam extending in the transverse direction of the second tray 31, and two ends of the second crossbeam are respectively connected to two side frames of the second frame which are respectively located at two ends of the transverse direction of the second tray 31 and are opposite to each other; the first tray connecting screw member includes a seventh threaded connector 35 connecting the second crossbeam and the first crossbeam 216, which further improves the integrity of the battery pack and the stability of the battery module.

[0076] In some embodiments, a height of the second border is less than a height of the first border.

[0077] The first tray 21 also includes a first longitudinal beam 215 extending along the longitudinal direction of the first tray 21. Both ends of the first longitudinal beam 215 are respectively connected to two opposite side frames of the first frame which are respectively located at the two ends of the longitudinal direction of the first tray 21. The first longitudinal beam 215 intersects with the first cross beam 216 to divide the space enclosed by the first frame into a plurality of battery cell module placement cavities.

[0078] The second tray 31 also includes a second longitudinal beam extending along the longitudinal direction of the second tray 31, and both ends of the second longitudinal beam are respectively connected to two side frames of the second frame which are respectively located at the two ends of the longitudinal direction of the first tray 21 and are opposite to each other, and the second longitudinal beam intersects with the second cross beam to divide the space enclosed by the second frame into a plurality of battery cell module placement cavities; the first tray connecting screw parts include an eighth threaded connector 36 connecting the second longitudinal beam and the first longitudinal beam 215, which further improves the integrity of the battery pack and the stability of the battery module.

[0079] See also Fig.11 The first frame of the first tray 21 of this embodiment includes a first side frame 211 provided at one end of the first tray 21 in the transverse direction, a second side frame 212 provided at the other end of the first tray 21 in the transverse direction, a third side frame 214 provided at one end of the first tray 21 in the longitudinal direction, and a fourth side frame 217 provided at the other end of the first tray 21 in the longitudinal direction. The two ends of the first crossbeam 216 are respectively connected to the first side frame 211 and the second side frame 212, and the two ends of the first crossbeam 215 are respectively connected to the third side frame 214 and the fourth side frame 217.

[0080] The portion of the first tray 21 protruding from the fourth side frame 217 along the longitudinal direction includes a beam 213 extending in the transverse direction of the first tray 21. The beam 213 has connection holes for connecting to the bottom plate 11, and the first threaded connector 22 and the second threaded connector 23 pass through the connection holes on the beam 213 at both ends of the longitudinal direction of the first tray 21 to connect to the bottom plate 11.

[0081] A water cooling plate 2110 for cooling the battery module is disposed on the portion of the first tray 21 that protrudes from the fourth side frame 217 along the longitudinal direction.

[0082] Furthermore, threaded connection parts 219 for connecting the side frames, the second cross beam and the second longitudinal beam of the second pallet 31 are respectively provided on the side frames of the first frame, the first cross beam 216 and the first longitudinal beam 215 .

[0083] The side frames, second cross beams and second longitudinal beams of the second pallet 31 are respectively provided with through holes opposite to the threaded connection parts 219. The fourth threaded connection member 32 and the fifth threaded connection member 33 respectively pass through the through holes on the side frames at both ends of the longitudinal direction of the second pallet 31 and are connected to the threaded connection parts 218 on the third side frame 214 and the fourth side frame 217 of the first pallet 21.

[0084] The two groups of sixth threaded connectors 34 pass through the through holes on the side frames at both ends of the second tray 31 and are connected to the threaded connectors 219 on the first side frame 211 and the second side frame 212 of the first tray 21 .

[0085] The seventh threaded connector 35 passes through the through hole on the second cross beam of the second pallet 31 and is connected to the threaded connector 219 on the first cross beam 216 of the first pallet 21. The eighth threaded connector 36 passes through the through hole on the second longitudinal beam of the second pallet 31 and is connected to the threaded connector 219 on the first longitudinal beam 215 of the first pallet 21.

[0086] The battery pack also includes a third battery module assembly 4 arranged above the first battery module assembly 2, the side panel includes a first side panel 12 and a second side panel 14 opposite to the first side panel 12, the inner surface of the first side panel 12 and the inner surface of the second side panel 14 are respectively provided with a first support component 121 and a second support component, and the third battery module assembly 4 is placed on the first support component 121 and the second support component.

[0087] The first supporting component 121 is provided with a first mounting hole for connecting the third battery module assembly 4 ; the second supporting component is provided with a second mounting hole for connecting the third battery module assembly 4 .

[0088] The third battery module assembly 4 includes a third tray and a third battery cell module arranged on the third tray. The third tray is connected to the first support component 121 and the second support component through the first mounting hole and the second mounting hole respectively.

[0089] The third tray 41 includes a third tray body and a third frame. The side frames of the third frame located at both ends of the longitudinal direction of the third tray 41 are connected to the side frames at both ends of the longitudinal direction of the second tray 31 through the ninth threaded connector 42 and the tenth threaded connector 43 respectively.

[0090] The side frames of the third frame, which are respectively located at the two transverse ends of the third tray 41 , are connected to the side frames at the two transverse ends of the second tray 31 through the eleventh threaded connector 44 .

[0091] In some embodiments, a height of the third border is less than a height of the first border.

[0092] The third tray 41 further includes a third crossbeam extending in the transverse direction of the third tray 41, and two ends of the third crossbeam are respectively connected to two side frames of the third frame located at two ends of the transverse direction of the third tray 41. The third crossbeam and the second crossbeam are connected by a twelfth threaded connector 45.

[0093] The third tray 41 also includes a third longitudinal beam extending in the longitudinal direction of the third tray 41, and the two ends of the third longitudinal beam are respectively connected to the two side frames of the third frame respectively located at the two ends of the longitudinal direction of the third tray 41. The third longitudinal beam and the second longitudinal beam are connected by a thirteenth threaded connector 46. The third longitudinal beam and the third cross beam intersect to divide the space surrounded by the third frame into a plurality of battery module placement cavities. The battery module M1, the battery module M2, the battery module M3 and the battery module M4 are respectively placed in the plurality of battery placement cavities.

[0094] Further, see Figure 1 and Figure 2 The side panels of this embodiment include a first side panel 12, a second side panel 14 arranged opposite to the first side panel 12, a third side panel 13 arranged between the first side panel 12 and the second side panel 14, and a fourth side panel 16 opposite to the third side panel 13. The first side panel 12, the second side panel 14, the third side panel 13 and the fourth side panel 16 enclose a rectangular space. A first sealing component 17 is arranged between two adjacent side panels, and the first sealing component 17 is a sealing strip extending along the edge of the side panel. Second sealing components 18 are respectively arranged between the side panel and the bottom panel 11 and between the side panel and the top panel 15. The second sealing component 18 includes a rectangular sealing gasket.

[0095] See also Figure 3 The bottom plate 1 is provided with a bottom plate seal groove 111 for accommodating the second sealing member 18 between the bottom plate 11 and the side plate. The bottom plate 1 is also provided with a side plate mounting hole 112 for mounting the side plate. In some embodiments, the side plate mounting hole comprises a countersunk hole.

[0096] The bottom plate 1 is also provided with a tray mounting hole 113 for mounting the first tray 31. In some embodiments, the tray mounting hole 113 comprises a threaded hole. The first threaded connector 22, the second threaded connector 23, and the third threaded connector 24 all pass through the through hole on the first tray 31 and are threadedly matched with the corresponding tray mounting hole 113.

[0097] See also Figure 4 and 5 In this embodiment, a first supporting component 121 supporting the third battery module assembly 4 is provided on the inner surface of the first side plate 12, and a component mounting portion for connecting the third battery module assembly 4 is provided on the first supporting component 121. In some embodiments, the component mounting portion includes a threaded hole.

[0098] A first top plate mounting portion 123 for connecting to the top plate 15 is provided on the top surface of the first side plate 12. In some embodiments, the first top plate mounting portion 123 includes a threaded hole. A first bottom plate mounting portion for connecting to the bottom plate 11 is provided on the bottom surface of the first side plate 12. In some embodiments, the first bottom plate mounting portion includes a threaded hole. The first bottom plate mounting portion is adapted to the side plate mounting hole 112 on the bottom plate 1.

[0099] In some embodiments, the side panels of the box body 1 are provided with clamping bracket mounting holes. The clamping bracket mounting holes include first clamping bracket connecting holes 124 provided on the first side panel 12. The first side panel 12 is also provided with a first hoisting hole 125 and a first weight reduction hole 126 for connecting a hoisting device.

[0100] The structure of the second side plate 14 is substantially the same as that of the first side plate 12 , and will not be described in detail herein.

[0101] See also Figures 6 to 8 The third side plate 13 is provided with side plate limiting parts 131 for limiting the movement of the first side plate 12 and the second side plate 14 on both sides. The third side plate 13 is also provided with side plate sealing grooves 132 for accommodating the first sealing component 17 on both sides.

[0102] The top surface of the third side plate 13 is provided with a second top plate mounting portion 133 for connecting to the top plate 15. In some embodiments, the second top plate mounting portion 123 includes a threaded hole. The bottom surface of the third side plate 13 is provided with a second bottom plate mounting portion for connecting to the bottom plate 11. In some embodiments, the second bottom plate mounting portion includes a threaded hole.

[0103] The clamping bracket mounting hole includes a second clamping bracket connecting hole 134 provided on the third side plate 13. The third side plate 13 is also provided with connecting structures 135 for connecting adjacent side plates on both sides. In some embodiments, the connecting structure 135 includes a countersunk hole. The third side plate 13 is also provided with a second hoisting hole 136 and a second weight reduction hole 137 for connecting a hoisting device.

[0104] The structure of the fourth side plate 16 is substantially the same as that of the third side plate 13 , and will not be described in detail herein.

[0105] See also Fig. 9 The top plate 15 is also provided with a limit structure for limiting the movement of the side plate relative to the top plate 15. The top plate 15 is provided with a side plate connecting structure 152 for connecting the side plate. In some embodiments, the connecting structure 152 includes a countersunk hole. In some embodiments, the top plate 15 is also provided with high and low voltage connectors, explosion-proof valves, water faucet installation holes, etc.

[0106] In this embodiment, the battery pack is provided with a first battery module assembly 1, a second battery module assembly 2 and a third battery module assembly 4. The first battery module assembly 1, the second battery module assembly 2 and the third battery module assembly 4 are arranged in order from bottom to top. The battery pack also includes six slave boards 5, an assembly output copper bar 6, a total negative output copper bar 7, two upper and lower layer series copper bars 8, as well as internal pipelines, FPC, external output connectors, MSD, faucet, explosion-proof valve, etc.

[0107] See also Fig.10 The first battery module assembly 2 as the bottom layer includes a first tray 21, a first threaded connector 22 connecting one longitudinal end of the first tray 21 with the bottom plate 11, a second threaded connector 23 connecting the other longitudinal end of the first tray 21 with the bottom plate 11, and a third threaded connector 24 connecting the transverse end of the first tray 21 with the bottom plate 11. The first battery module assembly 2 also includes a first connection row 25 for connecting the cell modules of the first battery module assembly 2.

[0108] In some embodiments, the first threaded connector 22 , the second threaded connector 23 , and the third threaded connector 24 are all bolts.

[0109] The second battery module assembly 3 as the middle layer includes a second pallet 31, a fourth threaded connector 32 connecting one longitudinal end of the second pallet 31 to the first pallet 21, a fifth threaded connector 33 connecting the other longitudinal end of the second pallet 31 to the first pallet 21, a sixth threaded connector 34 connecting the lateral end of the second pallet 31 and the first pallet 21, a seventh threaded connector 35 connecting the first cross beam 216 and the second cross beam, an eighth threaded connector 36 connecting the second longitudinal beam and the first longitudinal beam 215, and a second connecting row 37.

[0110] In some embodiments, the fourth threaded connector 32 , the fifth threaded connector 33 , the sixth threaded connector 34 , the seventh threaded connector 35 , and the eighth threaded connector 36 are all bolts.

[0111] The third battery module assembly 4 as the upper layer includes a third pallet 41, a ninth threaded connector 42 connecting one longitudinal end of the fourth pallet 41 with the second pallet 31, a tenth threaded connector 43 connecting the other longitudinal end of the third pallet 41 with the second pallet 31, an eleventh threaded connector 44 connecting the lateral end of the third pallet 41 and the second pallet 31, a twelfth threaded connector 45 connecting the third cross beam and the second cross beam, a thirteenth threaded connector 36 connecting the third longitudinal beam and the second longitudinal beam, and a third connecting row 37.

[0112] In some embodiments, the ninth threaded connector 42 , the tenth threaded connector 43 , the eleventh threaded connector 44 , the twelfth threaded connector 45 , and the thirteenth threaded connector 36 are all bolts.

[0113] Each layer of battery module assemblies is arranged with four battery modules M1, M2, M3, and M4. The number of battery modules M1 and M4 located at the front is an even number, and the number of battery modules M2 and M3 located at the rear is a base number. This ensures that the first connecting row 25, the second connecting row 37, the third connecting row 47 and other connecting rows between two modules in each layer of the front and rear series battery modules are arranged on the outside, which is convenient for the connection and tightening of the connecting rows between the modules by bolts.

[0114] According to another aspect of the present invention, a battery system is provided. The battery system includes a battery pack group. The battery pack group includes multiple layers of battery packs. Each layer of battery packs includes the multiple battery packs 10 described above arranged side by side.

[0115] The battery system further includes a clamping bracket 20 disposed on a side of the battery pack and a clamping member 30 connecting the clamping bracket 20 and a side plate of the battery pack.

[0116] See also Fig.12 and Fig.13 The clamping component 30 includes a pin 301, a flange 302 connected to one end of the pin 301, and a clamping bolt 303, and the flange 301 is provided with a first bolt hole allowing the clamping bolt 303 to pass through;

[0117] The clamping bracket 20 is provided with a pin hole allowing the pin 301 to pass through and a second bolt hole allowing the clamping bolt 303 to pass through; a clamping bracket connecting hole 134 is provided on the side plate, and the clamping bracket connecting hole 134 includes a threaded hole 1342 adapted to the clamping bolt 303. The pin 301 passes through the pin hole on the clamping bracket 20 and abuts or connects with the side plate of the battery pack 10. The flange 302 is provided on the side of the clamping bracket 20 away from the battery pack 10. The clamping bolt 303 passes through the first bolt hole and the second bolt hole and is threadedly connected with the threaded hole 1342.

[0118] In some embodiments, the clamping bracket connection hole 134 further includes a pin connection hole 1341 connected to the pin 301 .

[0119] The battery system mainly includes a battery pack 10, a clamping bracket 20 and a clamping component 30. The battery pack 10 can be directly pressed together up and down, and leaned against each other left and right. The front, back, left and right sides of the battery pack are clamped by the corresponding clamping brackets 20, and are wedged and fastened by the flange 302 and the pin 301. The pin 301 is wedged into the pin hole 1341 of the clamping bracket connection hole on the four side panels of the assembled box. The clamping bolt 303 presses the flange 302 on the surface of the clamping bracket 20 and is screwed into the bolt threaded hole 1342 of the clamping bracket connection hole on the four side panels.

[0120] In the embodiment of the present invention, the first side plate 12 and the second side plate 14 are respectively the left side plate and the right side plate. The third side plate 13 and the fourth side plate 16 are respectively the front side plate and the rear side plate. The first tray 21 is a high-frame tray, and the second tray 31 and the third tray 41 are low-frame trays.

[0121] See also Fig.14 This process mainly introduces the assembly sequence of the left and right side panels, front and rear panels, bottom panel, top panel, sealing components and internal three-layer battery module components of the assembled box. Other common process flows such as battery cell processing, stacking, and gluing are not specifically introduced in this patent. The battery pack assembly process of this embodiment is as follows:

[0122] First, place the bottom plate 11 on the production line, install the bottom high-frame tray (first tray 21) on the bottom plate 11, and then suck the bottom four battery modules stacked and welded on the tooling into the bottom high-frame tray with suction cups, install the middle low-frame tray (second tray 31) on top of the bottom high-frame tray, and suck the middle four battery modules stacked and welded on the tooling into the middle low-frame tray with suction cups, paste a second seal 18 on the groove on the inner surface of the bottom plate 11, install the left and right plates, and install the upper low-frame tray (third tray 41) on the left and right side plate support blocks (first support component 121 and second support component ) and the front, middle and rear end plates and vertical beams of the middle-layer short-frame tray, and the upper four battery modules stacked and welded on the tooling are sucked into the upper short-frame tray (the third tray 41) by suction cups respectively, and the two sealing strips of the rear plate (the first sealing component 17) are pasted on the groove on the inner surface of the rear plate, and then the rear plate is installed, and then the wiring harness, copper busbar and pipes inside the three-layer battery module box are installed, and the two sealing strips of the front plate are pasted on the groove on the inner surface of the front plate, and then the front plate is installed, and then the remaining high and low voltage connectors, explosion-proof valves, pipelines and copper busbars are installed, and the top sealing ring is pasted on the groove on the inner surface of the top plate, and then the top plate is installed, and the installation of a single battery pack is completed.

[0123] In this embodiment, the three-layer battery module is installed by placing each layer of trays and battery cell modules from bottom to top. Alternatively, each layer of trays and modules can be installed on the tooling and then hoisted into the assembled box.

[0124] In this embodiment, the blade battery design can also be used for square cells with poles and explosion-proof valves at the top, but the height dimension of the battery pack will be increased.

[0125] The technical solution of this embodiment achieves the following technical effects:

[0126] (1) The high-strength assembled box 1 is composed of six mounting plates (four side plates, a top plate 15 and a bottom plate 11) assembled by bolt connection. The six mounting plates are cast, with high strength and strong bearing capacity. The upper and lower battery packs can be directly stacked and pressed together, saving the external mounting bracket of the battery system;

[0127] (2) The side panels and top panel 15 of the assembled box body 1 can be installed after the three-layer battery modules and pipelines inside the box body 1 are connected, which simplifies the box-entering process of the three-layer battery cells, reduces the cost of process equipment, and improves production efficiency;

[0128] (3) The box 1 is arranged with three layers and double rows of battery cells in each layer. Compared with the traditional single-layer single-row battery cell arrangement scheme, more battery cells can be arranged, thereby increasing the voltage and power of a single battery pack; reducing the number of series and parallel battery packs in the battery system and simplifying the electrical system architecture.

[0129] The above are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A box body (1) comprises a bottom plate (11), a plurality of side plates erected on the bottom plate (11) and respectively detachably connected to the bottom plate (11), and a top plate (15) covering the plurality of side plates and respectively detachably connected to the plurality of side plates; and The first battery module assembly (2) comprises a first tray (21) stacked on the base plate (11) and detachably connected to the base plate (11), and a plurality of first battery cell modules arranged on the first tray (21).

2. The battery pack according to claim 1, characterized in that: The invention also comprises a second battery module assembly (3) arranged above the first battery module assembly (2), wherein the second battery module assembly (3) comprises a second tray (31) stacked on the first battery module assembly (2) and a plurality of second battery cell modules arranged on the second tray (31), and the second tray (31) is connected to the first tray (21).

3. The battery pack according to claim 1, characterized in that: The first tray (21) is connected to the bottom plate (11) via a plurality of bottom plate connecting screws, and the plurality of bottom plate connecting screws are arranged along the edge of the first tray (21).

4. The battery pack according to claim 3, characterized in that: The first tray (21) comprises a first tray body and a first frame arranged above the first tray body, and the tray body protrudes from the frame at both ends of the first tray (21) in the longitudinal direction. The bottom plate connecting threaded member comprises a first threaded connecting member (22) and a second threaded connecting member (23) which respectively connect two parts of the first tray body protruding from the frame in the longitudinal direction and the bottom plate (11).

5. The battery pack according to claim 3, characterized in that: The bottom plate threaded member includes a third threaded connection member (24) connecting one end of the first tray (21) along the lateral direction of the first tray (21) and the bottom plate (11); a recessed portion (218) is provided on a side surface of the first tray (21) along the lateral direction of the first tray (21) perpendicular to the bottom plate (11); and a third threaded connection member mounting hole matched with the third threaded connection member (24) is provided on the bottom surface of the recessed portion (218) parallel to the bottom plate (11).

6. The battery pack according to claim 1, characterized in that: The second pallet (31) and the first pallet (21) are connected via a plurality of first pallet connecting screws, and the plurality of first pallet connecting screws are arranged along an edge of the second pallet (31).

7. The battery pack according to claim 6, characterized in that: The first pallet connecting screw member comprises a fourth screw connection member (32) and a fifth screw connection member (33) respectively connecting two ends of the second pallet (31) along the longitudinal direction of the second pallet (31) and the first pallet (21).

8. The battery pack according to claim 6, characterized in that: The first tray connecting screw member includes a sixth screw connecting member (34) connecting one end of the second tray (31) along the lateral direction of the second tray (31) and the first tray (21).

9. The battery pack according to claim 6, characterized in that: The first tray (21) comprises a first tray body, a first frame arranged on the first tray body, and a first crossbeam (216) extending in the transverse direction of the first tray (21), wherein both ends of the first crossbeam (216) are respectively connected to the first frame; The second tray (31) comprises a second tray body, a second frame arranged on the second tray body and a second crossbeam extending in the transverse direction of the second tray (31), wherein both ends of the second crossbeam are respectively connected to the second frame; The first pallet connecting screw member includes a seventh screw connection member (35) connecting the second cross beam and the first cross beam (216).

10. The battery pack according to claim 9, characterized in that: The first tray (21) further comprises a first longitudinal beam (215) extending in the longitudinal direction of the first tray (21), two ends of the first longitudinal beam (215) are respectively connected to the first frame, and the first longitudinal beam (215) intersects with the first cross beam (216); The second tray (31) further comprises a second longitudinal beam extending in the longitudinal direction of the second tray (31), two ends of the second longitudinal beam are respectively connected to the second frame, and the second longitudinal beam intersects with the second cross beam; The first pallet connecting screw member includes an eighth screw connection member (36) connecting the second longitudinal beam and the first longitudinal beam (215).

11. The battery pack according to claim 1, characterized in that: It also includes a third battery module assembly (4) arranged above the first battery module assembly (2), the side plate includes a first side plate (12) and a second side plate (14) opposite to the first side plate (12), the inner surface of the first side plate (12) and the inner surface of the second side plate (14) are respectively provided with a first supporting component (121) and a second supporting component, and the third battery module assembly (4) is placed on the first supporting component (121) and the second supporting component.

12. The battery pack according to claim 11, characterized in that: The first supporting component (121) is provided with a first mounting hole for connecting the third battery module assembly (4); The second supporting component is provided with a second mounting hole for connecting the third battery module assembly (4).

13. The battery pack according to claim 12, characterized in that: The third battery module assembly (4) comprises a third tray and a third battery cell module arranged on the third tray, and the third tray is connected to the first supporting component (121) and the second supporting component through the first mounting hole and the second mounting hole respectively.

14. A battery system, characterized in that: The invention comprises a battery pack group, wherein the battery pack group comprises multiple layers of battery packs, and each layer of the battery packs comprises a plurality of battery packs (10) according to any one of claims 1 to 13 arranged side by side.

15. The battery system according to claim 14, characterized in that: It also includes a clamping bracket (20) arranged on the side of the battery pack and a clamping component (30) connecting the clamping bracket (20) and the side plate of the battery pack.

16. The battery system according to claim 15, characterized in that: The clamping component (30) comprises a pin shaft (301), a flange (302) connected to one end of the pin shaft (301), and a clamping bolt (303); the flange (301) is provided with a first bolt hole allowing the clamping bolt (303) to pass through; The clamping bracket (20) is provided with a pin hole for allowing the pin (301) to pass through and a second bolt hole for allowing the clamping bolt (303) to pass through; The side plate is provided with a clamping bracket connecting hole (134), and the clamping bracket connecting hole (134) includes a threaded hole (1342) adapted to the clamping bolt (303). The pin shaft (301) passes through the pin shaft hole on the clamping bracket (20) and abuts or is connected to the side plate of the battery pack (10); the flange plate (302) is arranged on the side of the clamping bracket (20) away from the battery pack (10); the clamping bolt (303) passes through the first bolt hole and the second bolt hole and is threadedly connected to the threaded hole (1342).

17. The battery system according to claim 16, characterized in that: The clamping bracket connection hole (134) further comprises a pin shaft connection hole (1341) connected to the pin shaft (301).

18. An engineering machine, characterized in that: A battery system comprising any one of claims 14 to 17.

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