Multi-layer stacked battery pack and vehicle

Abstract

Provided in the present application are a multi-layer stacked battery pack and a vehicle. The battery pack comprises: single-layer modules, each of which comprises a frame body and a battery module, wherein the frame body comprises a frame and a base plate, which are connected at the bottom and enclose a battery cavity for accommodating the battery module; and an upper cover. The plurality of single-layer modules are stacked in the direction of height; of every two adjacent single-layer modules, the base plate of the upper single-layer module is connected to the frame of the lower single-layer module to seal the battery cavity; and the upper cover is connected to the frame of the single-layer module at the top.

Description

A multi-layer stacked battery pack and a vehicle

[0001] The present application claims priority to Chinese patent applications No. 2024215203313 and 2024108652030, filed on June 28, 2024, with the Chinese Patent Office, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a multi-layer stacked battery pack and a vehicle. BACKGROUND

[0003] Electric vehicles mainly use electric power to provide driving force. In order to improve the endurance, in the case of limited battery energy density, the volume of the battery pack often needs to be relatively large, and the large-volume battery pack will affect the overall size of the vehicle body. TECHNICAL PROBLEM

[0004] The battery pack of the related art needs to increase the outer frame, which occupies a lot of space, so that more batteries cannot be placed in the limited space of the vehicle body, and more electric power cannot be provided. Moreover, the structure of such a battery pack has many types of components, and the cost is high. TECHNICAL SOLUTION

[0005] The present application provides a multi-layer stacked battery pack, comprising:

[0006] a single-layer module, comprising a frame body and a battery module, the frame body comprising a frame and a bottom plate, the bottom plate being connected to the bottom of the frame, and the frame and the bottom plate being arranged to form a battery cavity for accommodating the battery module; and

[0007] an upper cover;

[0008] Among the plurality of single-layer modules, the bottom plate of the single-layer module in the upper layer is connected to the frame of the single-layer module in the lower layer to close the battery cavity, and the upper cover is connected to the frame of the single-layer module at the top. ADVANTAGEOUS EFFECTS

[0009] The multi-layer stacked battery pack and the vehicle provided by the present application have the following advantageous effects: the battery pack comprises a plurality of single-layer modules and an upper cover, the plurality of single-layer modules are stacked in the height direction, the bottom plate of the single-layer module in the upper layer is connected to the frame of the single-layer module in the lower layer to close the battery cavity, i.e., the battery cavity of the single-layer module in the lower layer is closed by the single-layer module in the upper layer, the single-layer modules are stacked and connected together, and no additional outer frame is needed to fix the plurality of single-layer modules, thereby simplifying the structure, reducing the overall volume of the battery pack, saving the occupied space, and being particularly suitable for scenarios where the occupied space of the battery is limited, such as electric vehicles, electric bicycles, and other devices using batteries as power sources. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 is a perspective view of a battery pack according to the present application;

[0011] Fig. 2 is an exploded view of the battery pack according to the present application;

[0012] Fig. 3 is an exploded view of a single-layer module according to the present application;

[0013] Fig. 4 is an exploded view of a frame according to the present application;

[0014] Fig. 5 is a structural view of one of the side beams according to the present application;

[0015] Fig. 6 is a sectional view of two single-layer modules according to the present application;

[0016] Fig. 7 is an enlarged view of region A in Fig. 6;

[0017] Fig. 8 is a perspective view of a single-layer module according to the present application, as seen from the front end;

[0018] Fig. 9 is a perspective view of a single-layer module according to the present application, as seen from the rear end;

[0019] Fig. 10 is a schematic view of a liquid cooling solution for a single-layer module according to the present application;

[0020] Fig. 11 is a structural view of a vehicle according to the present application.

[0021] The reference numerals in the embodiments of the present application are explained as follows:

[0022] Battery pack 100, single-layer module 10, frame 11, side frame 111, side beam 1111, end beam 1112, upper flange 1113, vertical reinforcing rib 11131, lower flange 1114, first mounting hole 1115, second mounting hole 1116, groove 1117, vertical rib 1118, horizontal reinforcing rib 11181, horizontal rib 1119, bottom plate 112, heat-conducting glue 113, anti-expansion beam 114, anti-expansion reinforcing rib 1141, sealing foam 115, connecting screw 116, nut member 117, screw bushing 118, battery module 12, battery cell 121, upper cover 20, first liquid cooling cavity 31, second left liquid cooling cavity 32, second right liquid cooling cavity 33, third left liquid cooling cavity 34, third right liquid cooling cavity 35, fourth liquid cooling cavity 36, first partition rib 41, second partition rib 42, first passage 51, second passage 52, third passage 53, fourth passage 54, fifth passage 55, first sealing rib 61, second sealing rib 62, third sealing rib 63, fourth sealing rib 64, fifth sealing rib 65, sixth sealing rib 66, seventh sealing rib 67, liquid inlet 81, liquid outlet 82. Embodiments of the present application

[0023] Referring to FIGS. 1-3, the multi-layer stacked battery pack 100 of the present embodiment includes a plurality of single-layer modules 10 and an upper cover 20.

[0024] The single-layer module 10 includes a frame 11 and a battery module 12. The frame 11 includes a side frame 111 and a bottom plate 112 connected to the bottom of the side frame 111. The side frame 111 and the bottom plate 112 form a battery cavity 122 for accommodating the battery module 12. The plurality of single-layer modules 10 are stacked along the height direction. In the adjacent two layers of single-layer modules 10, the bottom plate 112 of the single-layer module 10 in the upper layer is connected to the upper portion of the side frame 111 of the single-layer module 10 in the lower layer to close the battery cavity 122. The upper cover 20 is connected to the upper portion of the side frame 111 of the single-layer module 10 at the top.

[0025] In the present embodiment, the battery pack 100 includes a plurality of single-layer modules 10 and an upper cover 20. The plurality of single-layer modules 10 are stacked along the height direction. The bottom plate 112 of the single-layer module 10 in the upper layer is connected to the side frame 111 of the single-layer module 10 in the lower layer to close the battery cavity 122. That is, the single-layer module 10 in the upper layer is used to close the battery cavity 122 of the single-layer module 10 in the lower layer. The single-layer modules 10 are stacked and connected together, and there is no need to additionally provide an outer frame to fix the plurality of single-layer modules 10. The structure is simplified, the overall volume of the battery pack 100 is reduced, the occupied space is saved, and it is particularly suitable for scenarios where the occupied space of the battery is limited, such as electric vehicles, electric bicycles, and other devices that use batteries as power sources.

[0026] The number of single-layer modules 10 included in the battery pack 100 can be two, three, or more. As shown in FIGS. 1-2, the number of single-layer modules 10 is four.

[0027] The upper cover 20 is connected to the single-layer module 10 at the top to close the battery cavity 122 of the single-layer module 10. The upper cover 20 can be made of a non-metal material, such as plastic.

[0028] In the adjacent two layers of single-layer modules 10, the frame 11 of the single-layer module 10 in the upper layer is detachably connected to the frame 11 of the single-layer module 10 in the lower layer. In this way, when the battery pack 100 fails, the single-layer modules 10 can be easily disassembled for maintenance of the single-layer module 10 with a fault. The detachable connection can be, for example, screw connection or clamping. In other examples, the bottom plate 112 of the single-layer module 10 in the upper layer is detachably connected to the side frame 111 of the single-layer module 10 in the lower layer.

[0029] Please refer to FIG. 3-4, the lower part of the frame 111 is provided with a lower flange 1114, the lower flange 1114 is provided with a first mounting hole 1115, the upper part of the frame 111 is provided with an upper flange 1113, the upper flange 1113 is provided with a second mounting hole 1116, the first mounting hole 1115 is aligned with the second mounting hole 1116. The first mounting hole 1115 and the second mounting hole 1116 can be both screw through holes or rivet through holes, or either one is a threaded hole. When assembling, please refer to FIG. 6-7, the connecting piece (such as connecting screw 116 or rivet) is connected through the first mounting hole 1115 of the upper frame 111 and the second mounting hole 1116 of the lower frame 111.

[0030] The battery pack 100 further comprises a connecting screw 116 and a nut piece 117.

[0031] In some examples, the connecting screw 116 is connected with the nut piece 117 after continuously passing through the first mounting hole 1115 of the upper frame 111 and the second mounting hole 1116 of the lower frame 111. Thus, after stacking two single-layer modules 10 together, the two are connected together by the connecting screw 116 and the nut piece 117. The number of the first mounting hole 1115, the second mounting hole 1116, the connecting screw 116 and the nut piece 117 corresponds one by one, and can be multiple, arranged along the length direction X on both sides of the frame 111, and uniformly distributed.

[0032] In other examples, the upper flange 1113 is provided with a threaded hole (not shown), and the first mounting hole 1115 is aligned with the threaded hole. The connecting screw 116 is connected with the threaded hole of the lower frame 111 after passing through the first mounting hole 1115 of the upper frame 111. Thus, after stacking two single-layer modules 10 together, the two are connected together by the connecting screw 116. The number of the first mounting hole 1115, the threaded hole and the connecting screw 116 corresponds one by one, and can be multiple, arranged along the length direction X on both sides of the frame 111, and uniformly distributed.

[0033] Please continue to refer to FIG. 6 and FIG. 7, the nut piece 117 can be a sleeve with a flange end, the sleeve is inserted into the second mounting hole 1116, the flange end of the sleeve abuts against the bottom of the upper flange 1113, the sleeve is provided with a screw thread inside, and the connecting screw 116 is connected with the screw thread inside the sleeve after passing through the first mounting hole 1115 of the upper frame 111.

[0034] In order to improve the connection strength, a screw bushing 118 can also be arranged in the first mounting hole 1115, the screw bushing 118 is inserted into the first mounting hole 1115, and the connecting screw 116 is connected with the nut piece 117 after passing through the screw bushing 118.

[0035] After the plurality of single-layer modules 10 are connected into one body as the battery pack 100, the battery pack 100 needs to be installed on a mounting base through mounting screws, and the mounting base can be the chassis of a vehicle or the shell of a certain device. The first mounting hole 1115 of the bottom frame 111 is also used for the mounting screws to pass through for connection with the mounting base. Thus, the bottom frame 111 does not need to additionally open a mounting hole, but realizes the connection with the mounting base through the first mounting hole 1115, greatly simplifying the structure of the frame 111 and reducing the cost.

[0036] The structure of the single-layer module 10 is introduced below.

[0037] Please refer to Figs. 3 and 4 again, the single-layer module 10 includes a frame 11 and a battery module 12, the frame 11 includes a frame 111 and a bottom plate 112, the bottom plate 112 is connected with the bottom of the frame 111, and the frame 111 and the bottom plate 112 surround to form a battery cavity 122 for accommodating the battery module 12. The bottom plate 112 is connected with the bottom of the frame 111, so that the frame 11 is in the form of a box with an open top. The bottom plate 112 can be composed of multiple plates. During assembly, the heat-conducting glue 113 is first applied on the bottom of the battery cavity 122, and then the battery module 12 is placed in the battery cavity 122 and fixed. The heat-conducting glue 113 can transfer the heat generated by the battery module 12 to the bottom plate 112 to improve the heat dissipation efficiency. The thickness of the heat-conducting glue 113 can be 1 mm.

[0038] The frame 111 includes two edge beams 1111 opposite to each other and two end beams 1112 opposite to each other, and the two edge beams 1111 and the two end beams 1112 form a frame structure. The upper flange 1113 is formed on the upper outer side of the edge beam 1111, and the lower flange 1114 is formed on the lower outer side of the edge beam 1111.

[0039] Please refer to Fig. 5, which shows the structure of the left edge beam 1111, and the right edge beam 1111 is a mirror image of the left edge beam 1111 in structure. The edge beam 1111 includes a vertical rib 1118 and a horizontal rib 1119, the vertical rib 1118 and the horizontal rib 1119 are vertically connected at the bottom of the vertical rib 1118, and the horizontal rib 1119 is located on the inner side of the vertical rib 1118, and the upper flange 1113 and the lower flange 1114 are located on the outer side of the vertical rib 1118. The vertical rib 1118 and the horizontal rib 1119 are vertically connected, which can improve the bending strength of the edge beam 1111 in the height direction and the left-right direction with smaller weight and volume, thereby improving the overall strength of the frame 11, better protecting the battery module 12, and being conducive to improving the stability and safety of the battery pack 100.

[0040] The vertical rib 1118 has a frame-shaped cross section, and the space in the frame is provided with a plurality of transverse reinforcing ribs 11181. The transverse reinforcing ribs 11181 can improve the structural strength of the vertical rib 1118, in particular the bending strength in the left-right direction, thereby improving the overall strength of the frame body 11. Moreover, compared with a solid structure, the vertical rib 1118 with a frame-shaped cross section has a lighter weight, and can provide higher structural strength with a lighter weight. The plurality of transverse reinforcing ribs 11181 can be arranged in a side-by-side manner, or can be arranged at a certain included angle.

[0041] The horizontal rib 1119 also has a frame-shaped cross section. Compared with a solid structure, the horizontal rib 1119 with a frame-shaped cross section has a lighter weight, and can provide higher structural strength with a lighter weight. In some cases, the space in the frame of the horizontal rib 1119 can also be provided with a plurality of reinforcing ribs to improve the structural strength.

[0042] The upper flange 1113 and the lower flange 1114 also have a frame-shaped cross section, and the space in the frame is provided with a vertical reinforcing rib 11131. The vertical reinforcing rib 11131 can improve the structural strength of the upper flange 1113 and the lower flange 1114, in particular the bending strength in the up-down direction (vertical direction), thereby improving the overall strength of the frame body 11.

[0043] Please refer to 3-4 again. The frame 111 also includes two anti-expansion beams 114. The battery module 12 includes a plurality of battery cells 121 arranged along the length direction X of the side beam 1111. The anti-expansion beams 114 are arranged on the inner side of the end beam 1112 facing the battery cells 121. The frame 111 has a cuboid shape, and the plurality of battery cells 121 are arranged along the length direction X of the side beam 1111. During long-period charge-discharge cycles, the battery cells 121 will expand to a certain extent due to lithium extraction and gas production, and the increasing expansion force will cause the structure of the battery module 12 to deform, and even affect the normal use of the battery pack 100. Therefore, it is necessary to suppress the expansion of the battery cells 121. The anti-expansion beams 114 are arranged on the inner side of the end beam 1112 facing the battery cells 121, i.e. the anti-expansion beams 114 are located between the battery cells 121 and the end beam 1112. When the battery cells 121 expand, the expansion force is borne by the anti-expansion beams 114, thereby suppressing the expansion of the battery cells 121, which is beneficial to prevent excessive deformation of the frame body 11, and is beneficial to avoid faults or safety accidents of the battery cells 121 due to expansion.

[0044] The cross section of the anti-expansion beam 114 is also in the shape of a frame, and a plurality of anti-expansion reinforcing ribs 1141 are arranged in the space inside the frame of the anti-expansion beam 114, which are connected to the two sides of the anti-expansion beam 114 along the front-rear direction (length direction X, i.e. the expansion direction of the battery cell 121). The anti-expansion reinforcing ribs 1141 can improve the structural strength of the anti-expansion beam 114, especially the bending strength along the front-rear direction, and thus improve the ability to suppress the expansion of the battery cell 121. The plurality of anti-expansion reinforcing ribs 1141 can be arranged in a side-by-side manner or at a certain angle.

[0045] Similarly, the cross section of the end beam 1112 can also be in the shape of a frame, and a plurality of reinforcing ribs can be arranged in the space inside the frame to improve the structural strength.

[0046] In one embodiment, the side beams 1111, the end beams 1112 and the anti-expansion beam 114 are all made of profiles. The profiles can be made of iron, aluminum or copper and their alloys by rolling, extrusion or casting process, and the cross section has a certain geometric shape. The bottom plate 112, the side beams 1111, the end beams 1112 and the anti-expansion beam 114 can all be made of aluminum profiles extruded. The connection between the side beams 1111 and the end beams 1112 can be screw connection, riveting or welding, and the welding process can be selected from FSW (Stationary shoulder FSW, friction stir welding), CMT (cold metal transfer welding technology), MIG (melt in inert gas welding).

[0047] In one embodiment, the single-layer module 10 further comprises sealing foam 115, which is laid on the top of the frame 111 and surrounds the battery module 12. The top of the frame 111 is provided with a groove 1117 for accommodating the sealing foam 115, and the bottom of the upper frame 111 presses the lower sealing foam 115 in the groove 1117. In this way, the sealing property of the battery cavity 122 can be improved, thereby protecting the battery module 12 inside. In some examples, the original thickness of the sealing foam 115 is 5 mm, and the depth of the groove 1117 is 2.5 mm. After being pressed by the upper frame 111, the thickness of the sealing foam 115 in the groove 1117 is pressed to 2.5 mm.

[0048] The frame 111 is mainly composed of two side beams 1111 and two end beams 1112, and each side beam 1111 and end beam 1112 is provided with a groove 1117 for placing the sealing foam 115.

[0049] Please refer to FIGS. 8-10, and the following describes the liquid cooling scheme of the single-layer module 10.

[0050] The battery module 12 generates heat during operation and needs to be cooled in time to prevent performance degradation or even safety accidents. In this embodiment, the battery module 12 is cooled by liquid cooling.

[0051] This embodiment illustrates the front, back, left and right directions of the single-layer module 10. These four directions are proposed only for the convenience of describing the technical solutions.

[0052] The two horizontal ribs 1119 have two bottom plates 112. The left horizontal rib 1119 is provided with a first cold liquid cavity 31, the left bottom plate 112 is provided with a second cold liquid cavity, the right bottom plate 112 is provided with a third cold liquid cavity, and the right horizontal rib 1119 is provided with a fourth cold liquid cavity 36. The first cold liquid cavity 31 is in communication with the second cold liquid cavity, the second cold liquid cavity is in communication with the third cold liquid cavity, and the third cold liquid cavity is in communication with the fourth cold liquid cavity 36. The first cold liquid cavity 31, the second cold liquid cavity, the third cold liquid cavity and the fourth cold liquid cavity 36 are all used for storing cooling liquid. In this way, the cooling liquid can flow in each cold liquid cavity, which can accelerate the cooling speed of the two horizontal ribs 1119 and the two bottom plates 112, and then improve the cooling efficiency of the battery module 12. In theory, each cold liquid cavity can be further divided into smaller cold liquid cavities. The cooling liquid can be a special cooling liquid used for battery cooling, or water.

[0053] The left bottom plate 112 is provided with a first partition rib 41 extending along the length direction X of the edge beam 1111. The first partition rib 41 divides the second cold liquid cavity into a second left cold liquid cavity 32 and a second right cold liquid cavity 33, and the second left cold liquid cavity 32 and the second right cold liquid cavity 33 are in communication. The right bottom plate 112 is provided with a second partition rib 42 extending along the length direction X of the edge beam 1111. The second partition rib 42 divides the third cold liquid cavity into a third left cold liquid cavity 34 and a third right cold liquid cavity 35, and the third left cold liquid cavity 34 and the third right cold liquid cavity 35 are in communication. The advantage of subdividing the cold liquid cavity is to increase the flow path of the cooling liquid, thereby improving the cooling efficiency.

[0054] The first cold liquid cavity 31, the second left cold liquid cavity 32, the second right cold liquid cavity 33, the third left cold liquid cavity 34, the third right cold liquid cavity 35 and the fourth cold liquid cavity 36 are in communication in sequence. The six cold liquid cavities are in communication in sequence, which can increase the flow path of the cooling liquid, thereby improving the cooling efficiency.

[0055] The first channel 51 connecting the first cold liquid cavity 31 and the second left cold liquid cavity 32 is close to the rear end of the frame body 11, the second channel 52 connecting the second left cold liquid cavity 32 and the second right cold liquid cavity 33 is close to the front end of the frame body 11, the third channel 53 connecting the second right cold liquid cavity 33 and the third left cold liquid cavity 34 is close to the rear end of the frame body 11, the fourth channel 54 connecting the third left cold liquid cavity 34 and the third right cold liquid cavity 35 is close to the front end of the frame body 11, and the fifth channel 55 connecting the third right cold liquid cavity 35 and the fourth cold liquid cavity 36 is close to the rear end of the frame body 11. Thus, the six cold liquid cavities are connected in series to realize a serpentine circuit of the cooling liquid and improve the cooling efficiency.

[0056] In one embodiment, the frame body 11 further comprises a first sealing rib 61, a second sealing rib 62, a third sealing rib 63, a fourth sealing rib 64, a fifth sealing rib 65, a sixth sealing rib 66 and a seventh sealing rib 67. The first sealing rib 61 is connected with the left lateral rib 1119 and seals the front end of the first cold liquid cavity 31, the second sealing rib 62 is connected with the left lateral rib 1119 and the left bottom plate 112 and seals the rear end of the first cold liquid cavity 31 and the second left cold liquid cavity 32, the third sealing rib 63 is connected with the left bottom plate 112 and seals the front end of the second left cold liquid cavity 32 and the second right cold liquid cavity 33, the fourth sealing rib 64 is connected with the two bottom plates 112 and seals the rear end of the second right cold liquid cavity 33 and the third left cold liquid cavity 34, the fifth sealing rib 65 is connected with the right bottom plate 112 and seals the front end of the third left cold liquid cavity 34 and the third right cold liquid cavity 35, the sixth sealing rib 66 is connected with the right bottom plate 112 and the right lateral rib 1119 and seals the rear end of the third right cold liquid cavity 35 and the fourth cold liquid cavity 36, and the seventh sealing rib 67 is connected with the right lateral rib 1119 and seals the front end of the fourth cold liquid cavity 36. Thus, the six cold liquid cavities can be sealed by the seven sealing ribs (the first four are in front and the last three are in rear). The sealing ribs can be sealed by welding, or sealed by interference fit or adhesive bonding.

[0057] Two side beams 1111 and two bottom plates 112 protrude along the length direction X of the side beams 1111 from the outer side of the end beam 1112 located at the front end of the frame body 11, the liquid inlet interface 81 and the liquid outlet interface 82 are both located at the outer side of the end beam 1112, one of the liquid inlet interface 81 and the liquid outlet interface 82 communicates with the first cold liquid cavity 31, and the other communicates with the fourth cold liquid cavity 36. The liquid inlet interface 81 communicates with the first cold liquid cavity 31, and the liquid outlet interface 82 communicates with the fourth cold liquid cavity 36. The liquid inlet interface 81 and the liquid outlet interface 82 can both be in the form of an elbow. The cooling liquid enters the first cold liquid cavity 31 through the liquid inlet interface 81, sequentially flows through the first cold liquid cavity 31, the second left cold liquid cavity 32, the second right cold liquid cavity 33, the third left cold liquid cavity 34, the third right cold liquid cavity 35 and the fourth cold liquid cavity 36, forms a serpentine loop, and finally flows out from the liquid outlet interface 82. The arrow in each cold liquid cavity indicates the flow direction of the cooling liquid. Based on this liquid cooling scheme, the battery module 12 has very high cooling efficiency, can maintain good working performance and high safety.

[0058] In some examples, the single-layer module 10 can also adopt the form of an existing CTP (Cell to Pack).

[0059] The embodiment of the present application provides a multi-layer stacked battery pack 100. The battery pack 100 is stacked by a plurality of single-layer modules 10, the single-layer module 10 can be mainly made of a profile, the overall volume of the battery pack 100 is small, more electric quantity can be stored in a limited space, and the types of structural members are reduced, and the overall cost of the battery pack 100 is reduced.

[0060] The advantages of the multi-layer stacked battery pack 100 provided by the embodiment are specifically listed as follows:

[0061] 1. The single-layer module 10 fully utilizes space to arrange the maximum number of battery cells 121, and the reinforced aluminum profile frame body 11 replaces the frame in the prior art, so that the structure is simplified;

[0062] 2. In the stacking of the plurality of single-layer modules 10, the profile bottom plate 112 of the upper single-layer module 10 can be used as the cover body of the lower single-layer module 10, and finally the entire battery pack has only one upper cover 20, compared with the prior art, three upper covers 20 (if four layers are stacked) are reduced, and the number and cost are reduced;

[0063] 3. In the prior art, the sealing of a battery pack is accomplished by a lower shell and a cover. The connection between the two requires M5 screws to be arranged at an average spacing of 70-80mm, and the number of screws is generally around 36. In the stacking of multiple single-layer modules 10 provided in this embodiment, except for the top cover 20 and the frame 111 which are riveted with core-pulling rivets similar to M5 screws, with the number of rivets being about 36, the bottom of the upper layer can serve as the cover of the lower layer between the other layers, which has good rigidity. The connecting screws 116 between the stacked layers can be M6 screws, which can reduce the number to 14, while ensuring the mechanical connection strength.

[0064] 4. The design of standard modules and the use of multiple common structural components (profiles) in each layer can reduce the types of structural components and lower costs.

[0065] Please refer to Figures 1 and 11. Figure 11 is a structural schematic diagram of the vehicle provided in this application.

[0066] This application also provides a vehicle including the aforementioned battery pack 100. The vehicle can be, for example, an electric car, an electric bicycle, an electric tricycle, etc., and can be either a motor vehicle or a non-motor vehicle. The vehicle uses the battery pack 100 as its power battery, which can provide a large driving range with a small footprint, improving the vehicle's space and facilitating its styling design.

Claims

1. A multi-layer stacked battery pack, comprising: a plurality of single-layer modules, each single-layer module comprising a frame and a battery module, the frame comprising a side frame and a bottom plate, the bottom plate being connected to a bottom of the side frame, the side frame and the bottom plate forming a battery cavity for accommodating the battery module; and an upper cover; wherein the plurality of single-layer modules are stacked along a height direction, in any two adjacent single-layer modules, the bottom plate of the single-layer module in the upper layer is connected to the side frame of the single-layer module in the lower layer to close the battery cavity formed by the single-layer module in the lower layer, and the upper cover is connected to the side frame of the single-layer module in the top layer.

2. The multi-layer stacked battery pack of claim 1, wherein, In any two adjacent single-layer modules, the frame of the single-layer module in the upper layer is detachably connected to the frame of the single-layer module in the lower layer, or the bottom plate of the single-layer module in the upper layer is detachably connected to the side frame of the single-layer module in the lower layer.

3. The multi-layer stacked battery pack of claim 1, wherein, The lower part of the side frame is provided with a lower flange, the lower flange is provided with a first mounting hole, the upper part of the side frame is provided with an upper flange, the upper flange is provided with a second mounting hole, and the first mounting hole is aligned with the second mounting hole. 4.The multi-layer stacked battery pack of claim 3, further comprising a connecting piece, the connecting piece being connected to the second mounting hole of the side frame of the single-layer module in the lower layer after passing through the first mounting hole of the side frame of the single-layer module in the upper layer. 5.The multi-layer stacked battery pack of claim 3, further comprising a connecting screw and a nut piece, the connecting screw being connected to the nut piece after successively passing through the first mounting hole of the side frame of the single-layer module in the upper layer and the second mounting hole of the side frame of the single-layer module in the lower layer.

6. The multi-layer stacked battery pack of claim 3, wherein, The first mounting hole of the side frame of the bottom layer is also used for a mounting screw to pass through for connecting with a mounting base.

7. The multi-layer stacked battery pack of any one of claims 3-6, wherein, The side frame comprises two edge beams opposite to each other and two end beams opposite to each other, and the two edge beams and the two end beams form a frame structure.

8. The multi-layer stacked battery pack of claim 7, wherein, The edge beam comprises a vertical rib and a horizontal rib, the vertical rib and the horizontal rib are vertically connected at the lower part of the vertical rib, the horizontal rib is located at the inner side of the vertical rib, and the upper flange and the lower flange are located at the outer side of the vertical rib.

9. The multi-layer stacked battery pack of claim 8, wherein, The two horizontal ribs have two bottom plates therebetween, the left horizontal rib is provided with a first cold liquid cavity, the left bottom plate is provided with a second cold liquid cavity, the right bottom plate is provided with a third cold liquid cavity, the right horizontal rib is provided with a fourth cold liquid cavity, the first cold liquid cavity is communicated with the second cold liquid cavity, the second cold liquid cavity is communicated with the third cold liquid cavity, the third cold liquid cavity is communicated with the fourth cold liquid cavity, and the first cold liquid cavity, the second cold liquid cavity, the third cold liquid cavity and the fourth cold liquid cavity are all used for storing cooling liquid.

10. The multi-layer stacked battery pack of claim 9, wherein, Any one or a combination of the left and right bottom plates is provided with a partition rib, specifically, the left bottom plate is provided with a first partition rib extending along the length direction of the edge beam, the first partition rib divides the second cold liquid cavity into a second left cold liquid cavity and a second right cold liquid cavity, and the second left cold liquid cavity and the second right cold liquid cavity are communicated; the right bottom plate is provided with a second partition rib extending along the length direction of the edge beam, the second partition rib divides the third cold liquid cavity into a third left cold liquid cavity and a third right cold liquid cavity, and the third left cold liquid cavity and the third right cold liquid cavity are communicated. The rib divides the third cold liquid chamber into a third left cold liquid chamber and a third right cold liquid chamber, and the third left cold liquid chamber and the third right cold liquid chamber are connected.

11. The multi-layer stacked battery pack of claim 10, wherein, The first cold liquid chamber, the second left cold liquid chamber, the second right cold liquid chamber, the third left cold liquid chamber, the third right cold liquid chamber, and the fourth cold liquid chamber are connected in sequence.

12. The multi-layer stacked battery pack of claim 11, wherein, A first channel connecting the first cold liquid chamber and the second left cold liquid chamber is located near the rear end of the frame; a second channel connecting the second left cold liquid chamber and the second right cold liquid chamber is located near the front end of the frame; a third channel connecting the second right cold liquid chamber and the third left cold liquid chamber is located near the rear end of the frame; a fourth channel connecting the third left cold liquid chamber and the third right cold liquid chamber is located near the front end of the frame; and a fifth channel connecting the third right cold liquid chamber and the fourth cold liquid chamber is located near the rear end of the frame.

13. The multi-layer stacked battery pack of claim 12, wherein, The frame further includes a first sealing rib, a second sealing rib, a third sealing rib, a fourth sealing rib, a fifth sealing rib, a sixth sealing rib, and a seventh sealing rib. The first sealing rib connects to the left-side horizontal rib and blocks the front end of the first cold liquid cavity. The second sealing rib connects to the left-side horizontal rib and the left-side base plate and blocks the rear ends of the first cold liquid cavity and the second left cold liquid cavity. The third sealing rib connects to the left-side base plate and blocks the front ends of the second left cold liquid cavity and the second right cold liquid cavity. The fourth sealing rib connects to the two base plates and blocks the rear ends of the second right cold liquid cavity and the third left cold liquid cavity. The fifth sealing rib connects to the right-side base plate and blocks the front ends of the third left cold liquid cavity and the third right cold liquid cavity. The sixth sealing rib connects to the right-side base plate and the right-side horizontal rib and blocks the rear ends of the third right cold liquid cavity and the fourth cold liquid cavity. The seventh sealing rib connects to the right-side horizontal rib and blocks the front end of the fourth cold liquid cavity.

14. The multi-layer stacked battery pack according to claim 13 further includes an inlet port and an outlet port, the two side beams and the two bottom plates protruding from the outside of the end beam located at the front end of the frame along the length direction of the side beams, the inlet port and the outlet port are both located on the outside of the end beam, one of the inlet port and the outlet port communicates with the first cold liquid chamber, and the other communicates with the fourth cold liquid chamber.

15. The multi-layer stacked battery pack of claim 7, wherein, The frame also includes two anti-expansion beams, and the battery module includes multiple cells arranged along the length of the side beams. The anti-expansion beams are located on the inner side of the end beams facing the cells.

16. The multi-layer stacked battery pack of claim 15, wherein, The side beam, the end beam, and the anti-expansion beam are all made of profiles.

17. The multi-layer stacked battery pack of any one of claims 1 to 6, wherein, The single-layer module also includes sealing foam, which is laid on top of the frame and surrounds the battery module.

18. The multi-layer stacked battery pack of claim 17, wherein, The top of the frame is provided with a groove to accommodate the sealing foam, and the bottom of the upper frame presses the lower sealing foam into the groove.

19. A vehicle comprising a multi-layered stacked battery pack as described in any one of claims 1-18.

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