Battery pack with supporting structure and multi-layer structure

Abstract

The invention discloses a supporting structure, which is used in a battery pack with a multilayer structure to support a plurality of battery modules stacked along the height direction, and comprises a battery box body, a battery box cover and a plurality of battery modules, and is characterized in that the battery box body comprises a base; the tray is located between the adjacent battery modules in the height direction, in the adjacent battery modules, the battery module located on the lower portion bears the tray, and the tray bears the battery module located on the upper portion; the base is independently connected with the tray so as to support the tray. The supporting structure provided by the invention can effectively disperse the pressure borne by the battery module at the lower part, especially the battery module at the bottom layer, solves the problem that the battery module at the bottom layer bears all the stress of the battery module at the upper layer, and improves the structural strength and the structural stability of the battery pack with the multi-layer structure. The invention also discloses a battery pack with a multilayer structure.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack with a supporting structure and a multi-layer structure. Background Art

[0002] At present, the power batteries used in new energy vehicles mainly include lithium iron phosphate batteries, ternary lithium batteries, etc. Although the battery energy density continues to increase, compared with traditional fuel vehicles, the range of electric vehicles is still far behind. Therefore, improving battery energy density has become an important research direction for the new energy vehicle industry.

[0003] CTP (Cell to Pack) technology eliminates the module structure in traditional battery packs and integrates the battery cells directly into the battery packs, simplifying the battery pack design and thus improving the space utilization and energy density of the battery packs.

[0004] In order to improve the energy density of new energy vehicle batteries, researchers have begun to focus on the technology of stacking cells in the Z-direction space (i.e. the space in the height direction of the battery pack). By optimizing the arrangement of cells and the design of the battery pack structure, the reasonable layout of cells in the Z-direction space can be achieved, thereby improving the battery energy density.

[0005] The invention patent with application number 202410745877.7 discloses a battery pack structure for a new energy light truck. An upper battery module and a lower battery module are stacked in the battery box to form a double-layer module structure. The upper battery module and the lower battery module are both composed of end plates, upper side bars, lower side bars and middle side bars to form a battery stacking module structure. The upper side bars and the lower side bars are respectively arranged on the upper edge and the lower edge of the side of the battery stacking module structure, and are connected to the end plates at both ends to form a square frame structure. The top and bottom sides of the end plates both adopt a card slot structure. The end plates of the upper battery module correspond one-to-one to the end plates of the lower battery module, and each pair of end plates is provided with a plurality of long tie rods, which pass through the corresponding end plates of the lower battery module from the end plates of the upper battery module and are assembled to the lower shell of the battery pack.

[0006] The above patent solves the technical problem that the existing new energy light truck battery pack structure is difficult to disassemble and maintain. However, since the upper battery module is directly stacked on the lower battery module, the lower battery module bears all the pressure of the upper battery module, which will affect the capacity, internal resistance, stability and other parameters of the battery cells in the lower battery module. This impact may shorten the battery life and reduce its stability. On the other hand, the structural strength of its battery pack is limited, which may lead to a decrease in the structural stability of the entire battery pack, thereby affecting the safety and reliability of the entire vehicle.

[0007] Therefore, it is necessary to solve the problem of unreasonable support structure design of the existing double-layer battery pack, which leads to high stress on the bottom battery module, low structural strength and poor structural stability. Summary of the invention

[0008] The present invention proposes a supporting structure, which designs a base and a tray that are adapted to the design and use of multiple battery modules in a multi-layer battery pack, so that the base and the battery modules located below jointly support the tray and the battery modules located above, so that the base and the battery modules located below disperse the pressure of the battery modules located above, thereby solving the problem that the bottom battery module bears all the forces of the battery modules located above it, and improving the structural strength and structural stability of the supporting structure.

[0009] In the first aspect, an embodiment of the present invention discloses a support structure for use in a multi-layer battery pack to support multiple battery modules stacked in a height direction, comprising: a battery case, the battery case comprising a base; a tray, the tray being located between battery modules adjacent in the height direction, wherein the battery module located at the bottom of the adjacent battery modules receives the tray, and the tray receives the battery module located at the top; the base is separately connected to the tray to provide support for the tray.

[0010] By adopting the above technical solution, the base provides support for the tray and the battery module located below supports the tray. That is to say, the base and the battery module located below jointly bear the pressure of the tray and the battery module located above the tray. This can effectively disperse the pressure on the battery modules located below, especially the battery modules on the bottom layer, and improve the structural strength and stability of the supporting structure.

[0011] Optionally, the pallet includes: a pallet cross beam, which is provided with a plurality of pallet cross beams, and the plurality of pallet cross beams are arranged along the length direction; a pallet longitudinal beam, which is provided with a pallet longitudinal beam top surface and a pallet longitudinal beam bottom surface, wherein the bottom surface of the pallet longitudinal beam is placed on a battery module located below, so that the battery module located below supports the pallet; the top surface of the pallet longitudinal beam supports the battery module located above and is connected to the battery module located above; each pallet cross beam is connected to each pallet longitudinal beam, and each pallet cross beam is perpendicular to each pallet longitudinal beam.

[0012] Optionally, the support structure includes: multiple cooling components stacked in the height direction; wherein the cooling components include: a first cooling component, arranged on the base; a second cooling component, integrated on the bottom surface of the tray; and the cooling components are connected to a cooling system arranged outside the battery pack.

[0013] Optionally, the second cooling assembly is integrated into the bottom surface of the pallet through an integrated connector; the pallet longitudinal beam is provided with a first hollow portion, corresponding to the position of the integrated connector, and the integrated connector passes through the pallet longitudinal beam to enter the first hollow portion; the pallet cross beam is provided with a second hollow portion, corresponding to the position of the integrated connector, and the integrated connector passes through the pallet cross beam to enter the second hollow portion; and / or the first hollow portion includes at least one trapezoidal hollow structure, and the second hollow portion includes at least one trapezoidal hollow structure.

[0014] In a second aspect, the present invention provides a multi-layer battery pack, comprising: a support structure as provided in any embodiment of the first aspect, and a plurality of battery modules stacked in a height direction.

[0015] By adopting the above technical solution, the base provides support for the tray and the battery module located below supports the tray. That is to say, the base and the battery module located below jointly bear the pressure of the tray and the battery module located above the tray. This can effectively disperse the pressure on the battery modules located below, especially the battery modules on the bottom layer, and improve the structural strength and stability of the multi-layer battery pack.

[0016] Optionally, each battery module includes: a battery cell portion, including a plurality of battery cell groups arranged along the length direction, the battery cell portion is provided with a first side surface and a second side surface relatively arranged along the length direction, and a third side surface and a fourth side surface relatively arranged along the width direction, and the length direction, width direction and height direction are perpendicular to each other, a frame, the battery cell portion is installed in the frame, the frame includes: cross beams, a plurality of cross beams are arranged along the length direction, the cross beams include: end cross beams, respectively arranged on the outer side surfaces of the first side surface and the second side surface; middle cross beams, respectively arranged between each adjacent two battery cell groups; longitudinal beams, respectively arranged on the outer side surfaces of the third side surface and the fourth side surface; each longitudinal beam is connected to each cross beam.

[0017] Optionally, the battery module located above is provided with a first shoulder, which protrudes in the width direction relative to the battery module located above, and the first shoulder is fixedly connected to the tray so that the tray receives the battery module located above; the battery module located below is provided with a second shoulder, which protrudes in the width direction relative to the battery module located below, and the second shoulder is used to receive the tray.

[0018] Optionally, the bottom surface of the pallet longitudinal beam is placed on the second shoulder so that the second shoulder receives the pallet; and the top surface of the pallet longitudinal beam receives the first shoulder and is connected to the first shoulder.

[0019] Optionally, the tray is provided with a first through hole, which passes through the tray along the height direction; the first shoulder is provided with a first notch; the second shoulder is provided with a second through hole, which passes through the second shoulder along the height direction; the base is provided with a third through hole, which is arranged along the height direction; the first through hole, the third through hole, the first notch and the second through hole are arranged relatively along the height direction; the first connecting member passes through the first through hole, the second through hole and the third through hole to fix the tray to the base.

[0020] Optionally, a multi-layer battery pack includes a support column, the support column is provided with a fourth through hole, the fourth through hole passes through the support column along the height direction; the first through hole, the fourth through hole, the third through hole, the first notch and the second through hole are relatively arranged along the height direction; the first connecting member passes through the first through hole, the second through hole, the fourth through hole and the third through hole to fix the tray to the base.

[0021] Optionally, the battery module located at the bottom layer is provided with a third shoulder, the third shoulder protrudes in the width direction relative to the battery module at the bottom layer, and the third shoulder is fixedly connected to the base.

[0022] Optionally, at least part of the longitudinal beams of the battery module located in the upper layer is located at the intersection of the pallet cross beam and the pallet longitudinal beam of the pallet. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 An exploded view showing a battery pack with a multi-layer structure in an embodiment of the present invention;

[0024] Figure 2 A three-dimensional diagram showing a battery pack with a multi-layer structure in an embodiment of the present invention;

[0025] Figure 3 An exploded view of a top battery module in an embodiment of the present invention is shown;

[0026] Figure 4 An exploded view of a bottom battery module in an embodiment of the present invention is shown;

[0027] Figure 5 A perspective view showing an integrated component of a tray and a second cooling assembly in an embodiment of the present invention;

[0028] Figure 6 A three-dimensional diagram showing some components of a battery pack in an embodiment of the present invention Figure 1 ;

[0029] Figure 7 A three-dimensional diagram showing some components of a battery pack in an embodiment of the present invention Figure 2 ;

[0030] Figure 8 A three-dimensional diagram showing some components of a battery pack in an embodiment of the present invention Figure 3 . DETAILED DESCRIPTION

[0031] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0032] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0033] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0034] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] refer to Figure 1 and Figure 2 An embodiment of the present invention discloses a support structure for use in a multi-layer battery pack 10 to support multiple battery modules stacked along a height direction, i.e., the Z direction shown in the figure, including a battery box 108 and a tray 104.

[0037] The battery box 108 includes a base 112. Specifically, the battery box 108 includes a bottom surface, and a mounting frame is provided on the inner surface of the bottom surface, and the mounting frame is also the base 112 in this embodiment.

[0038] The tray 104 is located between battery modules that are adjacent in the height direction, i.e., the Z direction. Among the adjacent battery modules, the battery module located at the bottom (for example, Figure 2 The first battery module 107 shown in FIG. 1 is supported by the tray 104, and the tray 104 is supported by the battery module located above (for example, Figure 2 The second battery module 103 is shown. The base 112 is separately connected to the tray 104 to provide support for the tray 104.

[0039] By adopting the above technical solution, the base 112 of the battery box 108 provides support for the tray 104, and the battery module located below supports the tray 104. That is to say, the base 112 and the battery module located below jointly bear the pressure of the tray 104 and the battery module located above the tray 104. This can effectively disperse the pressure on the battery modules located below, especially the battery modules on the bottom layer, solves the problem that the battery modules on the bottom layer bear all the forces of the battery modules located above it, and improves the structural strength and structural stability of the supporting structure.

[0040] In some possible embodiments provided by the present invention, reference is made to Figure 2 , Figure 5 and Figure 7 The pallet 104 includes a pallet crossbeam 1041 and a pallet longitudinal beam 1042. The pallet crossbeam 1041 has a plurality of pallet crossbeams 1041, and the plurality of pallet crossbeams 1041 are arranged along the length direction, i.e., the Y direction. The pallet longitudinal beam 1042 is provided with a pallet longitudinal beam top surface 1045 and a pallet longitudinal beam bottom surface 1046. The bottom surface 1046 of the pallet longitudinal beam 1042 is placed on the battery module located below, so that the battery module located below receives the pallet 104. The top surface 1045 of the pallet longitudinal beam 1042 receives the battery module located above and is connected to the battery module located above. Each pallet crossbeam 1041 is connected to each pallet longitudinal beam 1042, and each pallet crossbeam 1041 is perpendicular to each pallet longitudinal beam 1042.

[0041] In this embodiment, the tray 104 is set as a frame structure to enhance the structural strength of the tray 104. In particular, when a car collides, the support structure inside the car will also be impacted. The frame structure of the tray 104 can ensure its structural strength in the width direction, i.e., the X direction, and the length direction, i.e., the Y direction, to reduce the impact force when the support structure is hit, and to avoid damage to the support structure or safety problems caused by external impact. The bottom surface 1046 of the tray longitudinal beam 1042 is placed on the battery module located below, and the top surface 1045 of the tray longitudinal beam 1042 receives the battery module located above and is connected to the battery module located above, so that the stacking of multiple battery modules is realized, and the multiple battery modules are all frame structures, which improves the overall structural stability and enhances the structural strength.

[0042] In some possible embodiments provided by the present invention, reference is made to Figure 1 The support structure includes a plurality of cooling components. The plurality of cooling components are stacked along the height direction, i.e., the Z direction. The cooling components include a first cooling component 109 and a second cooling component 105. The first cooling component 109 is disposed on the base 112 and is used to cool the bottom battery module. Figure 5 The second cooling assembly 105 is integrated on the bottom surface of the tray 104 to cool the battery cell 207 supported thereon. The cooling assembly is connected to a cooling system provided outside the battery pack 10. The cooling system outside the battery pack 10 can provide cooling material to the first cooling assembly 109 and the second cooling assembly 105, thereby cooling the battery modules of each layer of the battery pack 10.

[0043] In this embodiment, the battery modules located on the upper layer are cooled by the second cooling component 105, and the battery modules located on the lower layer are cooled by the first cooling component 109, so that each layer of battery cells in the battery pack 10 has a good cooling and heat dissipation effect.

[0044] In this embodiment, the second cooling assembly 105 and the tray 104 are integrated parts, and the two are fixed by FDS. FDS (Frictional Direct Stamping) is a metal connection technology used in the automotive industry, especially in the manufacture of body structural parts. This technology directly fixes two metal parts together by friction welding without using traditional welding methods or adhesives.

[0045] refer to Figure 5 In some possible embodiments provided by the present invention, the second cooling assembly 105 is integrated with the bottom surface of the tray 104 through an integrated connector 16. Figure 8 , the pallet longitudinal beam 1042 is provided with a first hollow portion 171, corresponding to the position of the integrated connector 16. The integrated connector 16 passes through the pallet longitudinal beam 1042 and enters the first hollow portion 171. The pallet cross beam 1041 is provided with a second hollow portion (not shown in the figure), corresponding to the position of the integrated connector 16. The integrated connector 16 passes through the pallet cross beam 1041 and enters the second hollow portion. And / or, the first hollow portion 171 includes at least one trapezoidal hollow structure 1711, and the second hollow portion 172 includes at least one trapezoidal hollow structure (not shown in the figure).

[0046] refer to Figure 5 In some possible embodiments, the second cooling assembly 105 is integrated with the bottom surface of the tray 104 through an integrated connector 16. Figure 8The pallet longitudinal beam 1042 is provided with a first hollow portion 171, corresponding to the position of the integrated connector 16. The integrated connector 16 passes through the pallet longitudinal beam 1042 and enters the first hollow portion 171. The pallet cross beam 1041 is provided with a second hollow portion (not shown in the figure), corresponding to the position of the integrated connector 16. The integrated connector 16 passes through the pallet cross beam 1041 and enters the second hollow portion (not shown in the figure).

[0047] In this embodiment, the integrated connector 16 is accommodated by the first hollow portion 171 and the second hollow portion (not shown in the figure), which on the one hand saves space for the pallet longitudinal beam 1042 and the pallet cross beam 1041, and on the other hand enables the integrated connector 16 to quickly and conveniently penetrate the pallet longitudinal beam 1042 and the pallet cross beam 1041.

[0048] refer to Figure 8 In some possible embodiments, the first hollow portion 171 includes at least one trapezoidal hollow structure 1711, and the second hollow portion (not shown in the figure) includes at least one trapezoidal hollow structure (not shown in the figure).

[0049] In this embodiment, the trapezoidal hollow structure 1071 can effectively disperse the expansion force of the battery cell and enhance the structural strength and stability.

[0050] refer to Figure 8 In some possible embodiments, the pallet longitudinal beam 1042 is provided with a first hollow portion 171, corresponding to the position of the integrated connector 16. The integrated connector 16 passes through the pallet longitudinal beam 1042 and enters the first hollow portion 171. The pallet cross beam 1041 is provided with a second hollow portion (not shown in the figure), corresponding to the position of the integrated connector 16. The integrated connector 16 passes through the pallet cross beam 1041 and enters the second hollow portion. The first hollow portion 171 includes at least one trapezoidal hollow structure 1711, and the second hollow portion includes at least one trapezoidal hollow structure.

[0051] In this embodiment, the tray 104 is provided with both a hollow portion and at least one trapezoidal hollow structure, which has the technical effects produced by both the hollow portion and the hollow structure, which have been described in detail above and will not be repeated here.

[0052] In some other possible embodiments, the tray longitudinal beams 1042 are all hollow structures, and the tray cross beams 1041 are also all hollow structures. The hollow structure is a non-solid structure, which is helpful to reduce the weight of the tray 104 itself, thereby reducing the weight of the entire battery pack 10.

[0053] Second, refer to Figure 1 and Figure 2 The present invention provides a multi-layer battery pack 10, comprising a support structure as provided in any embodiment of the first aspect described above, and a plurality of battery modules stacked along a height direction.

[0054] It can also be said that the multi-layered battery pack 10 includes a battery case 108 and a stacking assembly.

[0055] The battery box 108 includes a base 112. Specifically, the battery box 108 includes a bottom surface, and a mounting frame is provided on the inner surface of the bottom surface, and the mounting frame is also the base 112 in this embodiment.

[0056] The stacking assembly is located in the battery box 108 and is mounted on the base 112. That is, the stacking assembly is mounted on the mounting frame on the bottom surface of the battery box 108. The stacking assembly includes a plurality of battery modules and a tray 104. The plurality of battery modules are stacked along the height direction, i.e., the Z direction. The tray 104 is located between the battery modules that are adjacent in the height direction, i.e., the Z direction. Among the adjacent battery modules, the battery module located at the bottom (for example, Figure 2 The first battery module 107 shown in FIG. 1 is supported by the tray 104, and the tray 104 is supported by the battery module located above (for example, Figure 2 The second battery module 103 is shown. The base 112 is separately connected to the tray 104 to provide support for the tray 104.

[0057] By adopting the above technical solution, the base 112 of the battery box 108 provides support for the tray 104, and the battery module located below supports the tray 104. That is to say, the base 112 and the battery module located below jointly bear the pressure of the tray 104 and the battery module located above the tray 104. This can effectively disperse the pressure on the battery modules located below, especially the battery modules on the bottom layer, solves the problem that the battery modules on the bottom layer bear all the forces of the battery modules located above it, and improves the structural strength and structural stability of the multi-layer battery pack 10.

[0058] In addition, the multi-layered battery pack 10 provided by the present invention stacks the battery modules of each layer as a whole as a module, and then loads them into the battery box 108 from bottom to top, thereby improving the grouping efficiency of the battery cells and thereby achieving an increase in the energy density of the entire pack at the same volume.

[0059] refer to Figure 3 and Figure 4 In some possible embodiments provided by the present invention, each battery module includes a battery core and a frame.

[0060] In this embodiment, the battery cell portion is a battery cell stack including a plurality of battery cell groups. The battery cell portion includes a plurality of battery cell groups 2076 arranged along the length direction, i.e., the Y direction. Figure 3 and Figure 4The cells 207 are arranged in a row along the width direction, that is, the X direction shown in the figure. Multiple rows of cells are arranged side by side to form a cell group 2076. For example, Figure 3 As shown, cell group 2076 may include two rows of cells, or cell group 2076 may include three rows of cells.

[0061] The cell portion is provided with a first side surface 211 and a second side surface 212 arranged opposite to each other along the length direction, i.e., the Y direction, and a third side surface 213 and a fourth side surface 214 arranged opposite to each other along the width direction, i.e., the X direction. The length direction, i.e., the Y direction, the width direction, i.e., the X direction, and the height direction, i.e., the Z direction, are perpendicular to each other.

[0062] For example, reference Figure 4 Each battery cell 207 is provided with two side surfaces 207B opposite to each other along the width direction, i.e., the X direction. The side surfaces 207B of multiple rows of battery cells are coplanar and respectively form two side surfaces of the battery cell group, that is, the battery cell group 2076 forms two side surfaces along the width direction, i.e., the X direction. The side surfaces of multiple battery cell groups 2076 are coplanar and respectively form a first side surface 211 and a second side surface 212.

[0063] Each battery cell 207 is provided with two narrower side surfaces 207A along the length direction, i.e., the Y direction. The narrower side surfaces 207A of multiple rows of battery cells are coplanar to form two narrower side surfaces, that is, the battery cell group 2076 forms two narrower side surfaces along the length direction, i.e., the Y direction. The narrower side surfaces of multiple battery cell groups 2076 are coplanar to form a third side surface 213 and a fourth side surface 214.

[0064] refer to Figure 3 and Figure 4 The battery cell is installed in the frame, and the frame includes a cross beam and a longitudinal beam 209. A plurality of cross beams are arranged along the length direction, i.e., the Y direction, and the cross beams include an end cross beam 2051 and a middle cross beam 2052. The end cross beam 2051 is respectively arranged on the outer side of the first side 211 and the second side 212. The middle cross beam 2052 is respectively arranged between each two adjacent battery cell groups 2076. The longitudinal beams 209 are respectively arranged on the outer side of the third side 213 and the fourth side 214. Each longitudinal beam 209 is connected to each cross beam (including the end cross beam 2051 and the middle cross beam 2052). Reference Figure 3 , each longitudinal beam 209 is perpendicular to each cross beam.

[0065] In this embodiment, in each battery module, the frame formed by the cross beam and the longitudinal beam 209 enhances the structural strength of the battery pack 10. In particular, when a car collides, a large impact force is generated in the width direction, i.e., the X direction, and the length direction, i.e., the Y direction. The battery module with a frame structure effectively reduces the impact force caused by the car collision on the battery pack 10, improves the structural strength of the battery pack 10, and effectively protects the safety of the battery pack 10.

[0066] For example, reference Figure 2 Each longitudinal beam 209 and each cross beam are connected by a cross and longitudinal beam connector 210, which is convenient for disassembly and installation, is beneficial to later maintenance and overhaul, and reduces subsequent maintenance and overhaul costs.

[0067] Compared with the frame structure with only the end cross beam 2051 and the longitudinal beam 209, the frame structure formed by the middle cross beam 2052, the end cross beam 2051 and the longitudinal beam 209 surrounds the four sides of each battery cell group 2076 in the battery cell part, has good stability for each battery cell group 2076, enhances the structural strength of the battery module, and can withstand large battery cell cycle expansion force. The middle cross beam 2052 serves as an additional structural support to enhance the overall rigidity and stability of the battery pack. This is also particularly important when the vehicle is hit by a collision or external impact, as it can protect the battery cells from damage.

[0068] At the same time, the middle crossbeam 2052 is provided to separate each two adjacent battery cell groups 2076, which can also effectively isolate the adjacent battery cell groups 2076, prevent the spread of thermal runaway, that is, prevent heat and flames from spreading from one battery cell group to another, thereby improving the overall safety of the battery system. Secondly, the middle crossbeam 2052 can limit the relative movement between the battery cells 207 due to expansion, contraction or vibration, reduce such interference, and extend the service life of the battery cells 207. Furthermore, since the battery cell groups 2076 are clearly separated by the middle crossbeam 2052, the faulty battery cell group 2076 can be removed or replaced separately without disassembling the battery pack as a whole. Therefore, the provision of the middle crossbeam 2052 makes the battery pack more convenient when maintaining or replacing the battery cells.

[0069] The multi-layered battery pack provided by the present invention is a CTP (Cell to Pack) multi-layer stacking structure, which omits the traditional standardized module link, directly integrates the battery cell 207 on the battery pack 10, realizes the high integration of the battery cell 207, and effectively improves the space utilization and energy density of the battery pack 10. In addition, the CTP multi-layer stacking structure omits the traditional standardized module link, simplifies the product structure of the battery pack 10, reduces the efficiency of the components of the battery pack 10, and improves the manufacturing efficiency. Specifically, the CTP multi-layer stacking structure can omit the side plate in the traditional module structure, eliminate the installation gap of the traditional module structure and use it to stack more battery cells 207. In addition, between the modules, a series bar sheet (or connecting sheet) is usually required to connect each module to form a complete circuit of the battery pack 10. CTP technology can significantly reduce the number of series bar sheets by optimizing the layout and connection method of the battery cells. This not only reduces costs, but also reduces the resistance inside the battery pack and improves the energy transfer efficiency.

[0070] In some possible embodiments provided by the present invention, reference is made to Figure 3 Combined with Figure 1 , the battery module located above (for example, the second battery module 103) is provided with a first shoulder 2091. The first shoulder 2091 protrudes relative to the battery module located above in the width direction, i.e., the X direction. The first shoulder 2091 is fixedly connected to the tray 104 so that the tray 104 receives the battery module located above (for example, the second battery module 103).

[0071] refer to Figure 4 Combined with Figure 1 , the battery module located below (for example, Figure 2 The first battery module 107 shown is provided with a second shoulder 1073. The second shoulder 1073 protrudes in the width direction, i.e., the X direction, relative to the battery module located below, and the second shoulder 1073 is used to receive the tray 104.

[0072] For example, reference Figure 3 The second battery module 103 is provided with a protruding flange along the width direction (ie, the X direction) toward the side away from the battery cell group 2076, which forms a first shoulder 2091. More specifically, referring to Figure 3 The longitudinal beam 209 of the second battery module 103 is provided with a longitudinal beam top surface 2093A and a longitudinal beam bottom surface 2094A along the height direction Z. The first shoulder 2091 is provided on the longitudinal beam bottom surface 2094A and protrudes toward a side away from the battery cell group 2076 along the width direction, ie, the X direction.

[0073] In this embodiment, reference Figure 3 The first shoulder 2091 is provided with an eighth through hole and a ninth through hole 2095, and the eighth through hole and the ninth through hole 2095 penetrate the first shoulder 2091 along the height direction, that is, the Z direction. Figure 5 The tray 104 is provided with a ninth through hole and a tenth through hole 1044 , and the ninth through hole and the tenth through hole 1044 penetrate the tray 104 along the height direction, ie, the Z direction. Figure 1 The third connecting member 111 shown in the figure passes through the eighth through hole, the ninth through hole 2095 , the ninth through hole 1044 to fix the upper battery module, ie, the second battery module 103 , on the tray 104 .

[0074] refer to Figure 1 The first battery module 107 is provided with a protruding flange along the width direction (ie, the X direction) toward the side away from the battery cell group 2076, which forms a second shoulder 1073. More specifically, referring to Figure 4The longitudinal beam 209 of the first battery module 107 is provided with a longitudinal beam top surface 2093B and a longitudinal beam bottom surface 2094B along the height direction Z. The second shoulder 1073 is provided on the longitudinal beam top surface 2093B and protrudes toward a side away from the battery cell group 2076 along the width direction, ie, the X direction.

[0075] In this embodiment, compared with directly connecting the tray 104 to the longitudinal beam 209 of the upper battery module, the tray 104 is connected to the upper battery module through the first shoulder 2091. The first shoulder 2091 can effectively disperse the pressure of the tray 104 and reduce stress concentration; the first shoulder 2091 can more evenly transfer the load to the entire cross-section of the longitudinal beam 209 of the upper battery module; the first shoulder 2091 provides additional operating space for inspection and maintenance, which is more convenient for inspecting and maintaining the battery module.

[0076] The tray 104 and the battery module located above are placed on the battery module located below. The battery module located below can more stably bear the load located thereon, that is, the tray 104 and the battery module located above, when the battery pack vibrates, through the second shoulder 1073, thereby improving the structural stability of the battery pack and reducing the displacement caused by vibration. Furthermore, the second shoulder 1073 can serve as a buffer layer to improve the shock absorption capacity of the battery pack structure.

[0077] It should be noted that the present invention provides a multi-layer battery pack, which includes multiple layers of battery modules stacked in sequence, and each of two adjacent layers of battery modules includes a battery module located at a lower layer and a battery module located at an upper layer.

[0078] The multi-layer battery pack may include a two-layer structure, namely, a battery module located at the bottom layer (that is, a battery module located at the bottom) and a battery module located at the top layer (that is, a battery module located at the top). Figure 2 and Figure 3 As shown, it includes a battery module 107 located at the bottom and a battery module 103 located at the top.

[0079] A multi-layer battery pack may also include three or more layers, namely, a battery module located at the bottom layer, a battery module located at the middle layer, and a battery module located at the top layer.

[0080] In some possible embodiments, the structures of the multi-layer battery modules are the same. That is, the structures of the multi-layer battery modules all include a battery core and a frame, and the frame includes a crossbeam and a longitudinal beam 209, and the longitudinal beam 209 is provided with two shoulders arranged oppositely in the height direction, i.e., the Z direction. Exemplarily, on the longitudinal beam 209 of each layer of the battery module, a first shoulder 2091 and a second shoulder 1073 are arranged oppositely in the height direction, i.e., the Z direction.

[0081] In some other possible embodiments, the battery module at the bottom layer has the same structure as the battery module at the middle layer, that is, the structure of the battery module includes a battery core and a frame, the frame includes a crossbeam and a longitudinal beam 209, and the longitudinal beam 209 is provided with two shoulders arranged oppositely in the height direction, i.e., the Z direction. The structures of the aforementioned two are different from the structure of the battery module at the top layer, because the battery module at the top layer no longer has a battery module arranged above it, and thus the first shoulder 2091 for receiving the tray 104 is omitted. In other words, the structure of the battery module at the top layer includes a battery core and a frame, and the frame includes a crossbeam, a longitudinal beam 209, and a second shoulder 1073 arranged on the longitudinal beam 209.

[0082] In some possible embodiments provided by the present invention, reference is made to Figure 2 , Figure 5 and Figure 7 The pallet 104 includes a pallet cross beam 1041 and a pallet longitudinal beam 1042. The pallet cross beam 1041 has a plurality of pallet cross beams 1041, and the plurality of pallet cross beams 1041 are arranged along the length direction, i.e., the Y direction. The pallet longitudinal beam 1042 is provided with a pallet longitudinal beam top surface 1045 and a pallet longitudinal beam bottom surface 1046. The bottom surface 1046 of the pallet longitudinal beam 1042 is placed on the second shoulder 1073, so that the second shoulder 1073 receives the pallet 104. The top surface 1045 of the pallet longitudinal beam 1042 receives the first shoulder 2091 and is connected to the first shoulder 2091. Each pallet cross beam 1041 is connected to each pallet longitudinal beam 1042, and each pallet cross beam 1041 is perpendicular to each pallet longitudinal beam 1042. In this embodiment, the pallet 104 is configured as a frame structure, which enhances the structural strength of the pallet 104. In particular, when a car collides, the battery pack 10 inside the car will also be impacted. The frame structure of the tray 104 can ensure its structural strength in the width direction, i.e., the X direction, and the length direction, i.e., the Y direction, and reduce the impact force when the battery pack 10 is hit, thereby preventing the battery pack 10 and the battery cell 207 from being damaged or causing safety problems due to external impact. The bottom surface 1046 of the tray longitudinal beam 1042 is placed on the second shoulder 1073, and the top surface 1045 of the tray longitudinal beam 1042 receives the first shoulder 2091 and is connected to the first shoulder 2091, thereby realizing the stacking of multi-layer battery modules, and the multi-layer battery modules are all frame structures, which improves the overall structural stability of the battery pack and enhances the structural strength.

[0083] In some possible embodiments provided by the present invention, continue to refer to Figure 5 The tray 104 is provided with a first through hole 1043, and the first through hole 1043 penetrates the tray 104 along the height direction, that is, the Z direction. Figure 3 The first shoulder 2091 is provided with a first notch 2092. Figure 4The second shoulder 1073 is provided with a second through hole 1074, and the second through hole 1074 penetrates the second shoulder 1073 along the height direction, that is, the Z direction. Figure 6 The base 112 is provided with a third through hole 1121, and the third through hole 1121 extends along the height direction, i.e., the Z direction. The first through hole 1043, the third through hole 1121, the first notch 2092, and the second through hole 1074 are arranged opposite to each other along the height direction, i.e., the Z direction. The first connecting member 106 (such as Figure 2 As shown in the figure, the first through hole 1043, the second through hole 1074 and the third through hole 1121 are penetrated to fix the tray 104 and the base 112 together.

[0084] Exemplarily, the first connecting member 106 is a bolt. The connection mode between the tray 104 and the base 112 is set to be bolt-fastened installation, which is easy to disassemble, conducive to later maintenance and repair, and reduces the cost of maintenance and repair.

[0085] refer to Figures 1 to 6 In this embodiment, since the first connecting member 106 needs to fix the tray 104 and the base 112, the first connecting member 106 will pass through the battery module located above (ie, Figure 1 The first shoulder 2091 of the second battery module 103 shown in FIG. 1 , the tray 104, and the battery module located below (ie, Figure 1 The second through hole 1074 of the second shoulder 1073 of the first battery module 107 is shown, and the third through hole 1121 of the base 112.

[0086] In some possible embodiments, in order to facilitate the fixed connection between the tray 104 and the base 112 , a first notch 2092 is provided on the first shoulder 2091 .

[0087] In some possible embodiments provided by the present invention, reference is made to Figure 2 , Figure 6 and Figure 7 The multi-layered battery pack 10 includes a support column 15. Figure 6 , the support column 15 is provided with a fourth through hole 151. The fourth through hole 151 penetrates the support column 15 along the height direction, i.e., the Z direction. The first through hole 1043, the fourth through hole 151, the third through hole 1121, the first notch 2092, and the second through hole 1074 are arranged relatively along the height direction, i.e., the Z direction. The first connecting member 106 penetrates the first through hole 1043, the second through hole 1074, the fourth through hole 151, and the third through hole 1121 to fix the tray 104, the second shoulder 1073, and the base 112.

[0088] In this embodiment, one end of the support column 15 along the height direction, ie, the Z direction, abuts against the tray 104 , and the other end abuts against the base 112 . The support column 15 is a rigid structure and can effectively support the tray 140 .

[0089] In some possible embodiments provided by the present invention, reference is made to Figure 4 Combined with Figure 1 The battery module at the bottom layer is provided with a third shoulder 1071 . The third shoulder 1071 protrudes along the width direction, ie, the X direction, relative to the battery module at the bottom layer, and the third shoulder 1071 is fixedly connected to the base 112 .

[0090] refer to Figure 4 , for example, Figure 4 The first battery module 107 shown is a battery module located at the bottom layer. The third shoulder 1071 protrudes relative to the battery module at the bottom layer along the width direction, i.e., the X direction, toward a side away from the battery core. The battery module at the bottom layer is fixedly connected to the base 112 through the third shoulder 1071.

[0091] In this embodiment, the third shoulder 1071 can effectively disperse the load from the battery module located at the bottom layer and the overall load from the multi-layer stacked battery modules, reducing stress concentration; the third shoulder 1071 provides additional operating space for inspection and maintenance, making it easier to inspect and maintain the battery modules.

[0092] In some possible embodiments, the third shoulder 1071 is provided with a third notch 1072. Along the height direction, ie, the Z direction, the first notch 2092 and the third notch 1072 are arranged opposite to each other, and neither of them hinders the first connector 106 from connecting the tray 104 and the base 112.

[0093] In this embodiment, reference Figure 2 and Figure 4 The third notch 1072 is used to provide an accommodation space for the support column 15 .

[0094] In some possible embodiments, reference Figure 4 The third shoulder 1071 is provided with a seventh through hole 1075. The seventh through hole 1075 penetrates the third shoulder 1071 along the height direction, i.e., the Z direction. Correspondingly, the base 112 is provided with an eighth through hole 1122. The seventh through hole 1075 is connected to the eighth through hole 1122. Figure 1 The battery module at the bottom layer also includes a second connector 110. Figure 1 and Figure 4 The second connecting member 110 passes through the seventh through hole 1075 and the eighth through hole 1122 to connect the battery module located at the bottom layer to the base 112 .

[0095] Exemplarily, the second connecting member 110 is a bolt. The connection mode between the battery module at the bottom and the base 112 is set to be bolt-fastened installation, which is easy to disassemble, conducive to later maintenance and repair, and reduces the cost of maintenance and repair.

[0096] In some possible embodiments, the second shoulder 1073 is provided with a second notch 1078. The second notch 1078 is provided along the height direction, i.e., the Z direction, corresponding to the seventh through hole 1075 provided on the third shoulder 1071. The second notch 1078 provides an operating space for the operator, so that the operator can pass the second connector 110 through the seventh through hole 1075 and the eighth through hole 1122 to achieve the connection between the bottom battery module and the base 112.

[0097] In the multi-layered battery pack 10 provided by the present invention, the base 112 is connected to the tray 104 and the battery module at the bottom layer at the same time. That is, the base 112 is provided with both the third through hole 1121 connected to the tray 104 and the eighth through hole 1122 connected to the battery module at the bottom layer, so the positions of the through holes need to be reasonably set. Exemplarily, the third through hole 1121 on the base 112 and the eighth through hole 1122 on the base 112 are staggered.

[0098] In some possible embodiments provided by the present invention, reference is made to Figure 8 , at least part of the longitudinal beams 209 of the battery module located on the upper layer are located at the intersection of the tray cross beam 1041 and the tray longitudinal beam 1042 of the tray 104, i.e., at A shown in the figure. That is to say, in this embodiment, the tray 104 not only supports the first shoulder 2091 of the battery module located on the upper layer, but also supports at least part of the longitudinal beams 209 of the battery module located on the upper layer. In this way, the tray 104 can more stably support the battery module located on the upper layer, and can effectively disperse the pressure of the battery module located on the upper layer.

[0099] In some possible embodiments provided by the present invention, the multi-layer battery pack 10 further includes an upper cover 101. The upper cover 101 covers the battery box 108 to encapsulate the stacked assembly in the battery pack 10. The upper cover 101 of the multi-layer battery pack 10 is encapsulated with the battery box 108 to achieve a sealed connection of the battery pack 10.

[0100] refer to Figure 2 and Figure 3 , taking a double-layer battery pack as an example to illustrate the specific assembly process of the multi-battery pack 10 provided by the present invention.

[0101] First, the battery modules of each layer are grouped.

[0102] refer to Figure 3The main components of the battery module of each layer include: plastic cover 201, CCS202 (Cells Contact System, i.e. battery connection system), output pole protection cover 203, output pole base 204, cross beams (end cross beam 2051 and middle cross beam 2052), aerogel felt 206, battery cell 207, end insulation sheet 208, longitudinal beam 209 and cross and longitudinal beam connector 210.

[0103] The battery cells 207 are stacked with the aerogel felt 206. The aerogel felt 206 has fireproof and flame retardant properties, plays a role in heat insulation, and improves the safety of the battery system.

[0104] Connect the fixed end cross beam 2051, the end insulation sheet 208 and the longitudinal beam 209, as well as the middle cross beam 2052, the end insulation sheet 208 and the longitudinal beam 209. The longitudinal beam 209 is extruded in sections by an external extrusion tool. Specifically, as Figure 3 As shown, the D1 area, D2 area, D3 area, and D4 area of ​​the longitudinal beam 209 are respectively extruded by an external extrusion tool, and the end cross beam 2051 and the longitudinal beam 209 as well as the middle cross beam 2052 and the longitudinal beam 209 are fastened and installed by using the cross and longitudinal beam connector 210 .

[0105] Then, the output pole base 204 is installed on the end cross beam 2051 on one side. The CCS 202 is laid flat and the busbar (i.e., busbar, or busbar) is welded. After welding, the plastic cover plate 201 and the output pole protection cover 203 are covered to complete the production of a single-layer battery module.

[0106] After completing the production of each layer of battery modules, they are stacked and installed in boxes.

[0107] refer to Figure 2 The two-layer battery pack 10 includes a first battery module 107 and a second battery module 103. In this embodiment, the first battery module 107 is a battery module located at the bottom layer, and the second battery module 103 is a battery module located at the top layer.

[0108] A first cooling plate 109 is provided at the bottom of the battery box 108 .

[0109] When stacking the stacking components in the battery pack 10 , the third shoulder 1071 of the battery module 107 at the bottom layer is first fixedly mounted to the base 112 of the battery box 108 through the second connecting member 110 , so that the battery module 107 at the bottom layer is fixedly mounted on the battery box 108 .

[0110] The tray 104 is placed on the second shoulder 1071 of the battery module 107 at the bottom layer, so that the second shoulder 1071 supports the tray 104 above it. The tray 104 is fixedly mounted to the base 112 of the battery box 108 through the first connector 106, so that the base 112 supports the tray 104.

[0111] The second cooling plate 105 and the tray 104 are integrated parts, and the two are fixed by the metal connection technology of FDS.

[0112] Then, the first shoulder 2091 of the second battery module 103 is fixed to the tray 104 through the third connecting member 111 , so that the second battery module 103 and the tray 104 are fixedly installed.

[0113] The upper cover sealing ring 102 is attached to the battery box 108, and finally the upper cover 101 of the battery pack is installed to complete the installation of the double-layer battery pack.

[0114] The multi-layered battery pack 10 provided by the present invention stacks the battery modules of each layer as a whole as a module, and then sequentially loads them into the interior of the battery box 108 from bottom to top, thereby improving the grouping efficiency of the battery cells and thereby achieving an increase in the energy density of the entire pack at the same volume.

[0115] In some other possible embodiments, the battery pack includes three or more layers of battery modules. Figure 2 The structure of the first battery module 107 shown in FIG. 1 is the same as that of the battery module 107 shown in FIG. Figure 2 The structure of the second battery module 103 shown in FIG. 1 is the same as that of the battery module in the middle layer. Figure 2 The structure of the first battery module 107 shown in China is similar. The longitudinal beam of the battery module located at the bottom layer is provided with a third shoulder and a second shoulder, and the third shoulder and the second shoulder are arranged oppositely along the height direction, i.e., the Z direction. The longitudinal beam of the battery module located in the middle layer is provided with a first shoulder and a second shoulder, and the first shoulder and the second shoulder are arranged oppositely along the height direction, i.e., the Z direction. There are multiple battery modules located in the middle layer. Each two adjacent battery modules are stacked along the height direction, i.e., the Z direction, and can therefore be referred to as a battery module located above and a battery module located below relative to each other.

[0116] The specific assembly method of the three-layer battery pack is also to complete the group production of each layer of battery modules first, and then stack the multi-layer battery modules. The assembly method of the multi-layer battery module stacking is similar to the assembly method of the aforementioned double-layer battery pack. First, install the battery module located on the bottom layer on the base. Then place the tray on the second shoulder of the battery module located on the bottom layer, and connect the tray to the base. Then fix the first shoulder of the battery module located in the middle layer to the tray. Place another tray on the second shoulder of the battery module located in the middle layer, and connect the other tray to the base. Then fix the first shoulder of the battery module located on the top layer to the other tray to complete the stacking of the battery modules.

[0117] The specific assembly method of a battery pack with more than three layers is similar to this and will not be elaborated here.

[0118] The multi-layer battery pack 10 provided by the present invention realizes the fixed installation of the multi-layer battery modules through the battery cell stacking frame structure (the cross beams and longitudinal beams of each battery cell module) and the box support (that is, the shoulder provided on each battery cell module), thereby improving the structural stability and strength of the battery pack, and can effectively disperse the pressure borne by the battery modules located below, especially the battery modules on the bottom layer, thereby solving the problem that the battery modules on the bottom layer bear all the forces of the battery modules located above it.

[0119] In addition, the multi-layer structure battery pack provided by the present invention realizes the connection between the base and the tray, and the base and the battery module located at the bottom layer by non-modularization and staggered arrangement of different through holes on the base, which effectively improves the cell integration of the higher battery pack of light truck models such as pickup trucks, thereby improving the overall energy density of the battery pack. In addition, the present invention also greatly reduces the number of parts, eliminates the series connection bars and module side panels between modules, reduces the number of output pole bases and output pole protective covers, and effectively reduces product costs. At the same time, the frame structure of each layer of battery modules and the stacking of multi-layer battery modules are fastened and installed with bolts, which has a good beneficial effect on the maintenance economy of later maintenance, and the manufacturing process is simple, which is conducive to large-scale production.

[0120] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A support structure used in a multi-layer battery pack to support multiple battery modules stacked in a height direction, characterized in that: include: A battery box, the battery box comprising a base; A tray is located between the battery modules adjacent to each other along the height direction, wherein the battery module located at the bottom of the adjacent battery modules receives the tray, and the tray receives the battery module located at the top; the base is separately connected to the tray to provide support for the tray.

2. The support structure according to claim 1, characterized in that The tray comprises: There are multiple pallet cross beams, and the multiple pallet cross beams are arranged along the length direction; A pallet longitudinal beam, wherein the pallet longitudinal beam is provided with a pallet longitudinal beam top surface and a pallet longitudinal beam bottom surface, wherein: The bottom surface of the tray longitudinal beam is placed on the battery module located below, so that the battery module located below receives the tray; The top surface of the tray longitudinal beam receives the battery module located above and is connected to the battery module located above; Each of the pallet cross beams is connected to each of the pallet longitudinal beams, and each of the pallet cross beams is perpendicular to each of the pallet longitudinal beams.

3. The support structure according to claim 1, characterized in that include: A plurality of cooling components are stacked along the height direction; wherein, The cooling assembly comprises: A first cooling assembly, disposed on the base; a second cooling assembly integrated into the bottom surface of the tray; The cooling assembly is connected to a cooling system arranged outside the battery pack.

4. The support structure according to claim 3, characterized in that The second cooling assembly is integrated with the bottom surface of the tray through an integrated connector; The pallet longitudinal beam is provided with a first hollow portion corresponding to the position of the integrated connecting piece, and the integrated connecting piece passes through the pallet longitudinal beam and enters into the first hollow portion; The pallet cross beam is provided with a second hollow portion corresponding to the position of the integrated connector, and the integrated connector passes through the pallet cross beam and enters the second hollow portion; and / or, The first hollow portion includes at least one trapezoidal hollow structure, and the second hollow portion includes at least one trapezoidal hollow structure.

5. A multi-layer battery pack, characterized in that: include: The support structure according to any one of claims 1 to 4, And multiple battery modules stacked along the height direction.

6. The multi-layer battery pack according to claim 5, characterized in that: Each of the battery modules comprises: The battery core portion includes a plurality of battery core groups arranged along a length direction, wherein the battery core portion is provided with a first side surface and a second side surface arranged opposite to each other along the length direction, and a third side surface and a fourth side surface arranged opposite to each other along a width direction, wherein the length direction, the width direction, and the height direction are perpendicular to each other, A frame, wherein the battery core is installed in the frame, and the frame comprises: A crossbeam, wherein a plurality of the crossbeams are arranged along the length direction, and the crossbeams include: End cross beams, respectively disposed on the outer side surfaces of the first side surface and the second side surface; A middle cross beam is provided between each two adjacent battery cell groups; longitudinal beams, respectively disposed on the outer sides of the third side surface and the fourth side surface; Each of the longitudinal beams is connected to each of the transverse beams.

7. The multi-layered battery pack according to claim 5, characterized in that: The battery module located above is provided with a first shoulder, the first shoulder protrudes in the width direction relative to the battery module located above, and the first shoulder is fixedly connected to the tray so that the tray receives the battery module located above; The battery module located below is provided with a second shoulder, the second shoulder protrudes along the width direction relative to the battery module located below, and the second shoulder is used to receive the tray.

8. The multi-layered battery pack according to claim 7, characterized in that: The bottom surface of the pallet longitudinal beam is placed on the second shoulder so that the second shoulder receives the pallet; The top surface of the pallet longitudinal beam receives the first shoulder and is connected to the first shoulder.

9. The multi-layered battery pack according to claim 8, characterized in that: The tray is provided with a first through hole, and the first through hole penetrates the tray along the height direction; The first shoulder is provided with a first notch; The second shoulder is provided with a second through hole, and the second through hole penetrates the second shoulder along the height direction; The base is provided with a third through hole, and the third through hole is arranged along the height direction; The first through hole, the third through hole, the first notch and the second through hole are arranged opposite to each other along the height direction; The first connecting member passes through the first through hole, the second through hole, and the third through hole to fixedly connect the tray to the base.

10. The multi-layered battery pack according to claim 9, characterized in that: A support column is included, wherein the support column is provided with a fourth through hole, and the fourth through hole penetrates the support column along the height direction; The first through hole, the fourth through hole, the third through hole, the first notch and the second through hole are arranged opposite to each other along the height direction; The first connecting member passes through the first through hole, the second through hole, the fourth through hole, and the third through hole to fixedly connect the tray to the base.

11. The multi-layered battery pack according to claim 5, characterized in that: The battery module located at the bottom layer is provided with a third shoulder, the third shoulder protrudes along the width direction relative to the battery module at the bottom layer, and the third shoulder is fixedly connected to the base.

12. The multi-layered battery pack according to claim 5, characterized in that: At least part of the longitudinal beams of the battery module located at the upper layer is located at the intersection of the tray cross beam and the tray longitudinal beam of the tray.

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