Battery pack with supporting structure and multi-layer structure

Abstract

The utility model 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 plurality of battery modules and a plurality of battery modules, 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 utility model 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 utility model also discloses a battery pack with a multilayer structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, especially a supporting structure, a battery pack with a multilayer structure. BACKGROUND

[0002] At present, the power battery used by new energy vehicles mainly includes lithium iron phosphate battery, ternary lithium battery and the like. Although the battery energy density is continuously improved, compared with traditional fuel vehicles, the cruising range of electric vehicles still has a large gap. Therefore, improving the battery energy density has become an important research direction of the new energy vehicle industry.

[0003] The CTP (Cell to Pack) technology cancels the module structure in the traditional battery pack, integrates the battery cell directly to the battery pack, simplifies the battery pack design, and thus improves the space utilization rate and energy density of the battery pack.

[0004] In order to improve the battery energy density of new energy vehicles, researchers have begun to focus on the technology of stacking battery cells in the Z-direction space (i.e. the space in the height direction of the battery pack). By optimizing the battery cell arrangement method, battery pack structure design and other methods, the rational layout of the battery cells in the Z-direction space is realized, thereby improving the battery energy density.

[0005] The utility model patent with the application number 202410745877.7 discloses a battery pack structure of a new energy light truck. The upper layer battery module and the lower layer battery module are stacked and arranged in the battery box to form a double-layer module structure of the battery pack. The upper layer battery module and the lower layer battery module are both composed of end plates, upper edge strips, lower edge strips and middle edge strips to form a battery cell stacking module structure. The upper edge strips and the lower edge strips are respectively arranged at the upper edge and the lower edge of the side edge of the battery cell stacking module structure and are connected with the end plates at both ends to form a square frame structure. The top side and the bottom side of the end plate are both provided with a clamping groove structure. The end plate of the upper layer battery module corresponds to the end plate of the lower layer battery module. Each pair of end plates is provided with a plurality of long pull rods. The long pull rods pass through the corresponding end plate of the lower layer battery module from the end plate of the upper layer battery module and are assembled to the lower shell of the battery pack.

[0006] Although the above-mentioned patent solves the technical problems of the existing new energy light truck battery pack structure that is not easy to disassemble and maintain. However, since the upper layer battery module is directly stacked on the lower layer battery module, the lower layer battery module bears all the pressure of the upper layer battery module, which will affect the capacity, internal resistance, stability and other parameters of the battery cells in the lower layer battery module. This influence may shorten the service life of the battery and reduce its stability. On the other hand, the structural strength of the battery pack is limited, which may lead to a decrease in the structural stability of the entire battery pack, and thus affect 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 causes large stress, low structural strength and poor structural stability of the bottom battery module. Utility model content

[0008] The utility model provides a support structure, through design and a plurality of battery module in the battery pack of multilayer structure adaptation design, the base of adaptation use, tray, make the base and the battery module below support tray and the battery module above, make the base and the battery module below disperse bear the pressure of the battery module above, solved the problem that the bottom battery module bears the whole stress of the battery module above it, and improved the structural strength, structural stability of support structure.

[0009] In a first aspect, the embodiments of the utility model disclose a support structure for supporting a plurality of battery modules stacked along a height direction in a battery pack of a multilayer structure, comprising: a battery box body, the battery box body comprising a base; a tray, the tray being located between adjacent battery modules along the height direction, among the adjacent battery modules, the battery module below receiving the tray, and the tray receiving the battery module above; the base is separately connected with the tray to provide support for the tray.

[0010] By the above technical scheme, the base provides support for the tray, and the battery module below receives the tray, that is, the base and the battery module below jointly bear the pressure of the tray and the battery module above received on the tray, which can effectively disperse the pressure borne by the battery module below, especially the bottom battery module, and improve the structural strength and stability of the support structure.

[0011] Optionally, the tray comprises: a plurality of tray cross beams arranged along the length direction; a tray longitudinal beam provided with a tray longitudinal beam top surface and a tray longitudinal beam bottom surface, wherein the bottom surface of the tray longitudinal beam is placed on the battery module below to enable the battery module below to receive the tray; the top surface of the tray longitudinal beam receives the battery module above and is connected with the battery module above; each tray cross beam is connected with each tray longitudinal beam, and each tray cross beam is perpendicular to each tray longitudinal beam.

[0012] Optionally, the support structure comprises: a plurality of cooling assemblies stacked along the height direction; wherein the cooling assembly comprises: a first cooling assembly arranged on the base; and a second cooling assembly integrated on the bottom surface of the tray; the cooling assembly is connected with a cooling system arranged outside the battery pack.

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

[0014] In a second aspect, the utility model provides a kind of battery pack of multi-layer structure, comprising: support structure as any one of preceding first aspect embodiment is provided, and multiple battery modules are stacked along height direction.

[0015] The above technical solution is adopted, the tray is supported by the base, and the battery module located below receives the tray, that is, the base and the battery module located below jointly bear the pressure of the tray and the battery module located above received on the tray, which can effectively disperse the pressure borne by the battery module located below, especially the battery module of bottom layer, and improve the structural strength and structural stability of the battery pack of multi-layer structure.

[0016] Optionally, each battery module comprises: a cell part including a plurality of cell groups arranged along a length direction, the cell part being provided with a first side and a second side oppositely arranged along the length direction, and a third side and a fourth side oppositely arranged along a width direction, the length direction, the width direction, and a height direction being perpendicular to each other; and a frame, the cell part being installed in the frame, the frame comprising: a plurality of transverse beams arranged along the length direction, each transverse beam comprising: an end transverse beam arranged at an outer side of the first side and the second side, respectively; a middle transverse beam arranged between each adjacent two cell groups; and a longitudinal beam arranged at an outer side of the third side and the fourth side, respectively; each longitudinal beam being connected with each transverse beam.

[0017] Optionally, the battery module located above is provided with a first shoulder part protruding along the width direction with respect to the battery module located above, the first shoulder part being fixedly connected with the tray so that the tray receives the battery module located above; and the battery module located below is provided with a second shoulder part protruding along the width direction with respect to the battery module located below, the second shoulder part being used for receiving the tray.

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

[0019] Optionally, the tray is provided with a first through hole penetrating 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 penetrating the second shoulder along the height direction; the base is provided with a third through hole arranged along the height direction; the first through hole, the third through hole, the first notch and the second through hole are oppositely arranged along the height direction; and the first connecting piece penetrates the first through hole, the second through hole and the third through hole to fixedly connect the tray and the base.

[0020] Optionally, the battery pack of the multi-layer structure comprises a support column, the support column is provided with a fourth through hole penetrating 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 oppositely arranged along the height direction; and the first connecting piece penetrates the first through hole, the second through hole, the fourth through hole and the third through hole to fixedly connect the tray and the base.

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

[0022] Optionally, at least part of the longitudinal beams of the battery module at the upper layer are located at the intersection of the tray cross beams and the tray longitudinal beams of the tray. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 An exploded view of the battery pack of the multi-layer structure in the embodiment of the utility model is shown;

[0024] Figure 2 A perspective view of the battery pack of the multi-layer structure in the embodiment of the utility model is shown;

[0025] Figure 3 An exploded view of the top layer battery module in the embodiment of the utility model is shown;

[0026] Figure 4 An exploded view of the bottom layer battery module in the embodiment of the utility model is shown;

[0027] Figure 5 A perspective view of the integrated piece of the tray and the second cooling assembly in the embodiment of the utility model is shown;

[0028] Figure 6 A perspective view of part of the components of the battery pack in the embodiment of the utility model is shown Figure 1 ;

[0029] Figure 7 A perspective view of part of the components of the battery pack in the embodiment of the utility model is shown Figure 2 ;

[0030] Figure 8 A perspective view of part of the components of the battery pack in the embodiment of the utility model is shown Figure 3. DETAILED DESCRIPTION

[0031] The above and other advantages and effects of the present application will become readily apparent to those of ordinary skill in the art from the following description thereof taken in conjunction with the accompanying drawings. Although the description of the present application will be made in connection with preferred embodiments, it will be readily apparent to those of ordinary skill in the art that the application is not limited to the preferred embodiments. In fact, those of ordinary skill in the art will readily appreciate that the application can be practiced with other alternatives or modifications to the preferred embodiments. In order to provide a thorough and enabling disclosure of the application as it can be practiced in any

[0032] It should be noted that in the description of the present application, similar reference numerals and letters in the drawings represent similar items, and thus, once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings.

[0033] The terms "first", "second", and the like, are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected", and "connection" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be connected inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present embodiment can be understood according to the specific circumstances.

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

[0036] Reference Figure 1 and Figure 2 The embodiments of the present application disclose a support structure for a battery pack 10 of a multi-layer structure to support a plurality of battery modules stacked in a height direction, i.e., a Z direction shown in the figure, including a battery box 108 and a tray 104.

[0037] The battery box 108 comprises a base 112. Specifically, the battery box 108 comprises a bottom surface, and the inner surface of the bottom surface is provided with a mounting frame, i.e., the base 112 in the embodiment.

[0038] The tray 104 is located between adjacent battery modules in the height direction, i.e., the Z direction. Among the adjacent battery modules, the lower battery module (exemplarily, the first battery module 107 shown) receives the tray 104, and the tray 104 receives the upper battery module (exemplarily, the second battery module 103 shown). Figure 2 The base 112 is separately connected with the tray 104 to provide support for the tray 104. Figure 2

[0039] With the above technical solution, the base 112 of the battery box 108 provides support for the tray 104, and the lower battery module receives the tray 104, that is, the base 112 and the lower battery module jointly bear the pressure of the tray 104 and the upper battery module received on the tray 104, which can effectively disperse the pressure borne by the lower battery module, especially the bottom layer battery module, solve the problem that the bottom layer battery module bears the entire stress of the battery module above it, and improve the structural strength and structural stability of the support structure.

[0040] In some possible embodiments of the utility model, referring to Figure 2 , Figure 5 and Figure 7 , the tray 104 comprises a tray cross beam 1041 and a tray longitudinal beam 1042. The tray cross beam 1041 has a plurality of tray cross beams 1041 arranged in the length direction, i.e., the Y direction. The tray longitudinal beam 1042 is provided with a tray longitudinal beam top surface 1045 and a tray longitudinal beam bottom surface 1046. The bottom surface 1046 of the tray longitudinal beam 1042 is placed on the lower battery module to enable the lower battery module to receive the tray 104. The top surface 1045 of the tray longitudinal beam 1042 receives and is connected with the upper battery module. Each tray cross beam 1041 is connected with each tray longitudinal beam 1042, and each tray cross beam 1041 is perpendicular to each tray longitudinal beam 1042.

[0041] ​In the embodiment, the tray 104 is arranged in a frame structure, which enhances the structural strength of the tray 104. Especially when the automobile collides, the support structure located in the interior of the automobile is also impacted, and the tray 104 in the frame structure can ensure the structural strength in the width direction, i.e., the X direction, and the length direction, i.e., the Y direction, reduce the impact force when the support structure is impacted, and avoid damage or safety problems of the support structure due to the impact of external force. 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 and is connected with the battery module located above, so that the stacking of the multiple layers of battery modules is realized, and the multiple layers of battery modules are all in the frame structure, which improves the overall structural stability and enhances the structural strength.

[0042] In some possible embodiments of the utility model, with reference to Figure 1 , the support structure comprises a plurality of cooling assemblies. The plurality of cooling assemblies are stacked along the height direction, i.e., the Z direction. Among them, the cooling assembly comprises a first cooling assembly 109 and a second cooling assembly 105. The first cooling assembly 109 is arranged on the base 112 and is used for cooling the bottom layer of battery modules. With reference to Figure 5 , the second cooling assembly 105 is integrated on the bottom surface of the tray 104 and is used for cooling the battery cell 207 supported thereby. The cooling assembly is connected with the cooling system arranged outside the battery pack 10. The cooling system outside the battery pack 10 can provide the first cooling assembly 109 and the second cooling assembly 105 with cooling substances, so as to realize the cooling of each layer of battery modules of the battery pack 10.

[0043] In the embodiment, the battery module located in the upper layer is cooled and radiated by the second cooling assembly 105, and the battery module located in the lower layer is cooled and radiated by the first cooling assembly 109, so that each layer of battery cells in the battery pack 10 has a good cooling and radiating effect.

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

[0045] With reference to Figure 5 , in some possible embodiments of the utility model, the second cooling assembly 105 is integrated on the bottom surface of the tray 104 through the integrated connecting piece 16. With reference to Figure 8, the tray longitudinal beam 1042 is provided with a first hollow part 171 corresponding to the position of the integrated connecting piece 16. The integrated connecting piece 16 penetrates the tray longitudinal beam 1042 into the first hollow part 171. The tray transverse beam 1041 is provided with a second hollow part (not shown in the figure) corresponding to the position of the integrated connecting piece 16. The integrated connecting piece 16 penetrates the tray transverse beam 1041 into the second hollow part (not shown in the figure). And / or, the first hollow part 171 comprises at least one trapezoidal hollow structure 1711, and the second hollow part 172 comprises at least one trapezoidal hollow structure (not shown in the figure).

[0046] With reference to Figure 5 In some possible embodiments, the second cooling assembly 105 is integrated on the bottom surface of the tray 104 through the integrated connecting piece 16. With reference to Figure 8 , the tray longitudinal beam 1042 is provided with a first hollow part 171 corresponding to the position of the integrated connecting piece 16. The integrated connecting piece 16 penetrates the tray longitudinal beam 1042 into the first hollow part 171. The tray transverse beam 1041 is provided with a second hollow part (not shown in the figure) corresponding to the position of the integrated connecting piece 16. The integrated connecting piece 16 penetrates the tray transverse beam 1041 into the second hollow part (not shown in the figure).

[0047] In the embodiment, the integrated connecting piece 16 is accommodated through the first hollow part 171 and the second hollow part (not shown in the figure), which on the one hand saves the space of the tray longitudinal beam 1042 and the tray transverse beam 1041, and on the other hand enables the integrated connecting piece 16 to quickly and conveniently penetrate the tray longitudinal beam 1042 and the tray transverse beam 1041.

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

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

[0050] With reference to Figure 8 In some possible embodiments, the tray longitudinal beam 1042 is provided with a first hollow part 171 corresponding to the position of the integrated connecting piece 16. The integrated connecting piece 16 penetrates the tray longitudinal beam 1042 into the first hollow part 171. The tray transverse beam 1041 is provided with a second hollow part (not shown in the figure) corresponding to the position of the integrated connecting piece 16. The integrated connecting piece 16 penetrates the tray transverse beam 1041 into the second hollow part. The first hollow part 171 comprises at least one trapezoidal hollow structure 1711, and the second hollow part comprises at least one trapezoidal hollow structure.

[0051] In the embodiment, the tray 104 is provided with both the hollow part and the at least one trapezoidal hollow structure, and has the technical effects of the hollow part and the hollow structure, which have been described above and will not be repeated here.

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

[0053] In a second aspect, with reference to Figure 1 and Figure 2 The utility model provides a kind of multi-layer structure's battery pack 10, including the support structure as described in any one of the first aspect above, and multiple battery modules stacked along the height direction.

[0054] It can also be said that the multi-layer structure's battery pack 10 includes battery box 108 and stacking assembly.

[0055] Among them, battery box 108 includes base 112. Specifically, battery box 108 includes bottom surface, and the inner surface of bottom surface is provided with mounting frame, which is base 112 in the embodiment.

[0056] Stacking assembly is located in battery box 108, and is installed on base 112. That is, stacking assembly is installed on the mounting frame of the bottom surface of battery box 108. Stacking assembly includes multiple battery modules and tray 104. Multiple battery modules are stacked along the height direction, i.e. Z direction. Tray 104 is located between adjacent battery modules along the height direction, i.e. Z direction. In adjacent battery modules, the battery module (exemplarily, such as Figure 2 The first battery module 107 shown) under the tray 104, and the tray 104 receives the battery module (exemplarily, such as Figure 2 The second battery module 103 shown) above. Base 112 is separately connected with tray 104 to provide support for tray 104.

[0057] With the above technical scheme, the base 112 of the battery box 108 provides support for the tray 104, and the battery module under the tray 104, that is, the base 112 and the battery module under the tray 104 jointly bear the pressure of the tray 104 and the battery module above the tray 104, which can effectively disperse the pressure borne by the battery module under the tray 104, especially the bottom layer battery module, solve the problem that the bottom layer battery module bears the entire stress of the battery module above it, and improve the structural strength and stability of the multi-layer structure's battery pack 10.

[0058] In addition, the multi-layer battery pack 10 provided by this utility model stacks each layer of battery modules as a whole, and then installs them into the battery box 108 from bottom to top, which improves the cell assembly efficiency and thus improves the overall energy density of the pack in the same volume.

[0059] refer to Figure 3 and Figure 4 In some possible embodiments provided by this utility model, each battery module includes a cell and a frame.

[0060] In this embodiment, the battery cell section is a stack of batteries comprising multiple battery cell groups. Specifically, the battery cell section includes multiple battery cell groups 2076 arranged along the length direction, i.e., the Y direction. (See reference...) Figure 3 and Figure 4 The battery cells 207 are arranged in a row along the width direction, i.e., the X direction shown in the figure. Multiple rows of battery cells are arranged side by side to form a battery cell group 2076. For example, as shown... Figure 3 As shown, the cell assembly 2076 may include two rows of cells, or the cell assembly 2076 may include three rows of cells.

[0061] The battery cell has a first side surface 211 and a second side surface 212 arranged opposite each other along the length direction (Y direction), and a third side surface 213 and a fourth side surface 214 arranged opposite each other along the width direction (X direction). The length direction (Y direction), the width direction (X direction), and the height direction (Z direction) are perpendicular to each other.

[0062] For example, refer to Figure 4 Each cell 207 has two opposite sides 207B arranged along the width direction (X direction). The sides 207B of multiple rows of cells are coplanar, forming two sides of the cell group, that is, the cell group 2076 forms two sides along the width direction (X direction). The sides of multiple cell groups 2076 are coplanar, forming the first side 211 and the second side 212.

[0063] Each cell 207 has two narrower side surfaces 207A along its length direction (Y direction). The narrower side surfaces 207A of multiple rows of cells are coplanar, forming two narrower side surfaces, that is, the cell assembly 2076 forms two narrower side surfaces along its length direction (Y direction). The narrower side surfaces of multiple cell assemblies 2076 are coplanar, forming a third side surface 213 and a fourth side surface 214.

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

[0065] In this embodiment, the frame formed by the cross beams and the longitudinal beams 209 enhances the structural strength of the battery pack 10 in each battery module. Especially when the automobile is in a collision, a large impact force is generated in the width direction, i.e., the X direction, and the length direction, i.e., the Y direction, and the battery module with the frame structure effectively reduces the impact force caused by the automobile 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] Exemplarily, referring to Figure 2 Each longitudinal beam 209 and each cross beam are connected through the cross-longitudinal beam connector 210, which facilitates disassembly and installation and is conducive to subsequent maintenance and repair, thereby reducing the cost of subsequent maintenance and repair.

[0067] Compared with the frame structure provided with only the end cross beams 2051 and the longitudinal beams 209, the frame structure provided with the middle cross beams 2052, the end cross beams 2051, and the longitudinal beams 209 surrounds the four side surfaces of each cell group 2076 in the cell part, has good stability for each cell group 2076, enhances the structural strength of the battery module, and can also withstand a large cell cyclic 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 particularly important when the vehicle is subjected to a collision or external impact, as it can protect the cells from damage.

[0068] At the same time, the middle cross beam 2052 separates each adjacent two cell groups 2076 and can also effectively isolate the adjacent cell groups 2076, prevent the spread of thermal runaway, i.e., prevent heat and flames from spreading from one cell group to another, thereby improving the overall safety of the battery system. Secondly, the middle cross beam 2052 can limit the relative movement between the cells 207 due to expansion, contraction, or vibration, reduce such interference, and prolong the service life of the cells 207. Furthermore, since the cell groups 2076 are clearly separated by the middle cross beam 2052, a faulty cell group 2076 can be individually removed or replaced without having to disassemble the entire battery pack. Therefore, the provision of the middle cross beam 2052 makes it more convenient to maintain or replace the cells of the battery pack.

[0069] The multi-layer battery pack provided by this utility model is a CTP (Cell to Pack) multi-layer stacked structure, which omits the traditional standardized module stage and directly integrates the battery cells 207 onto the battery pack 10, achieving a high degree of integration of the battery cells 207 and effectively improving the space utilization and energy density of the battery pack 10. Furthermore, the CTP multi-layer stacked structure omits the traditional standardized module stage, simplifying the product structure of the battery pack 10, reducing the number of components in the battery pack 10, and improving manufacturing efficiency. Specifically, the CTP multi-layer stacked structure can eliminate the side plates in the traditional module structure, eliminating the installation gaps in the traditional module structure and allowing for the stacking of more battery cells 207. Additionally, series connectors (or connecting pieces) are typically used between modules to connect the various modules, thereby forming the complete circuit of the battery pack 10. CTP technology, by optimizing the layout and connection method of the battery cells, can significantly reduce the number of series connectors. This not only reduces costs but also reduces the internal resistance of the battery pack and improves energy transfer efficiency.

[0070] In some possible embodiments provided by this utility model, reference is made to Figure 3 and combined Figure 1 The upper battery module (exemplarily, such as the second battery module 103) is provided with a first shoulder 2091. The first shoulder 2091 protrudes in the width direction, i.e., the X direction, relative to the upper battery module. The first shoulder 2091 is fixedly connected to the tray 104 so that the tray 104 receives the upper battery module (exemplarily, such as the second battery module 103).

[0071] refer to Figure 4 and combined Figure 1 The battery module located below (exemplarily, such as...) Figure 2 The first battery module 107 shown has 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 is used to receive the tray 104.

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

[0073] In this embodiment, reference Figure 3The first shoulder 2091 is provided with an eighth through hole and a ninth through hole 2095, which penetrate the first shoulder 2091 along the height direction, i.e., the Z direction. (Reference) Figure 5 The tray 104 is provided with a ninth through hole and a tenth through hole 1044, which penetrate the tray 104 along the height direction, i.e., the Z direction. Figure 1 The third connector 111 shown passes through the eighth through hole, the ninth through hole 2095, the ninth through hole, and the tenth through hole 1044 to fix the upper battery module, namely the second battery module 103, onto the tray 104.

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

[0075] In this embodiment, compared to directly connecting the tray 104 to the longitudinal beam 209 of the upper battery module, connecting the tray 104 to the upper battery module via the first shoulder 2091 can effectively distribute 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, making it easier to inspect and maintain the battery module.

[0076] By placing the tray 104 and the upper battery module on top of the lower battery module, the lower battery module, through the second shoulder 1073, can more stably bear the load on it when the battery pack vibrates, thus improving the structural stability of the battery pack and reducing displacement caused by vibration. Furthermore, the second shoulder 1073 can act as a buffer layer, improving the shock absorption capacity of the battery pack structure.

[0077] It should be noted that this utility model provides a multi-layer battery pack, which includes multiple layers of battery modules stacked sequentially, and each pair of adjacent battery modules includes a lower battery module and an upper battery module.

[0078] A multi-layered battery pack may include two layers: a bottom battery module and a top battery module. For example, such as...Figure 2 and Figure 3 As shown in FIG. 1, the battery pack 100 includes a battery module 103 located at the top layer, a battery module 107 located at the bottom layer, and a battery module 105 located at the middle layer.

[0079] The battery pack of the multi-layer structure can also include a three-layer and above structure, i.e., including 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 battery modules of the multi-layer structure are the same. That is, the battery modules of the multi-layer structure all include a cell part and a frame, and the frame includes a cross beam, a longitudinal beam 209, and the longitudinal beam 209 is provided with two shoulder parts arranged oppositely along the height direction, i.e., the Z direction. Exemplarily, on the longitudinal beam 209 of the battery module at each layer, a first shoulder part 2091 and a second shoulder part 1073 are arranged oppositely along the height direction, i.e., the Z direction.

[0081] In some other possible embodiments, the battery module located at the bottom layer and the battery module located at the middle layer are the same in structure, i.e., the structure of the battery module includes a cell part and a frame, and the frame includes a cross beam, a longitudinal beam 209, and the longitudinal beam 209 is provided with two shoulder parts arranged oppositely along the height direction, i.e., the Z direction. The structure of the above two is different from the structure of the battery module located at the top layer, because the battery module located at the top layer has no battery module above it, and thus the first shoulder part 2091 for receiving the tray 104 is omitted. That is, the structure of the battery module located at the top layer includes a cell part and a frame, and the frame includes a cross beam, a longitudinal beam 209, and a second shoulder part 1073 provided on the longitudinal beam 209.

[0082] In some possible embodiments of the utility model, with reference to Figure 2 , Figure 5 and Figure 7The tray 104 comprises a tray cross beam 1041 and a tray longitudinal beam 1042. The tray cross beam 1041 is provided in plurality, and the plurality of tray cross beams 1041 are arranged along the length direction, i.e. the Y direction. The tray longitudinal beam 1042 is provided with a tray longitudinal beam top surface 1045 and a tray longitudinal beam bottom surface 1046. The bottom surface 1046 of the tray longitudinal beam 1042 is placed on the second shoulder portion 1073, so that the second shoulder portion 1073 supports the tray 104. The top surface 1045 of the tray longitudinal beam 1042 supports and is connected with the first shoulder portion 2091. Each tray cross beam 1041 is connected with each tray longitudinal beam 1042, and each tray cross beam 1041 is perpendicular to each tray longitudinal beam 1042. In the embodiment, the tray 104 is arranged in a frame structure, so as to enhance the structural strength of the tray 104. Especially when the automobile is in collision, the battery pack 10 located in the automobile is also impacted, the frame structure of the tray 104 can ensure the structural strength of the tray 104 in the width direction, i.e. the X direction, and the length direction, i.e. the Y direction, reduce the impact force when the battery pack 10 is impacted, and avoid damage or safety problems of the battery pack 10 and the battery cell 207 due to external force impact. The bottom surface 1046 of the tray longitudinal beam 1042 is placed on the second shoulder portion 1073, the top surface 1045 of the tray longitudinal beam 1042 supports and is connected with the first shoulder portion 2091, the stacking of the multi-layer battery module is realized, and the multi-layer battery module is in a frame structure, so as to improve the overall structural stability of the battery pack and enhance the structural strength.

[0083] In some possible embodiments of the present application, further reference is made to Figure 5 The tray 104 is provided with a first through hole 1043 penetrating the tray 104 along the height direction, i.e. the Z direction. Figure 3 The first shoulder portion 2091 is provided with a first notch 2092. Figure 4 The second shoulder portion 1073 is provided with a second through hole 1074 penetrating the second shoulder portion 1073 along the height direction, i.e. the Z direction. Figure 6 The base 112 is provided with a third through hole 1121 extending 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 oppositely arranged along the height direction, i.e. the Z direction. The first connecting member 106 (as shown in Figure 2 The first connecting member 106 penetrates the first through hole 1043, the second through hole 1074 and the third through hole 1121 to fixedly connect the tray 104 and the base 112.

[0084] Exemplarily, the first connecting member 106 is a bolt. The connecting mode of the tray 104 and the base 112 is arranged as bolt fastening installation, which is convenient for disassembly, beneficial to later maintenance and repair, and reduces the cost of maintenance and repair.

[0085] refer to Figure 1 to Figure 6 In this embodiment, since the first connector 106 needs to fix the tray 104 to the base 112, the first connector 106 will pass through the battery module located above (i.e., as shown in the image). Figure 1 The second battery module 103 shown has a first shoulder 2091, a tray 104, and a battery module located below it (i.e., as shown in the diagram). Figure 1 The second through hole 1074 of the second shoulder 1073 of the first battery module 107) and the third through hole 1121 of the base 112 are shown.

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

[0087] In some possible embodiments provided by this utility model, reference is made to Figure 2 , Figure 6 and Figure 7 The multi-layered battery pack 10 includes support pillars 15. (Reference) Figure 6 The support column 15 is provided with a fourth through hole 151. The fourth through hole 151 extends through 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 opposite each other along the height direction, i.e., the Z direction. The first connector 106 passes through 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 abuts against the tray 104 along the height direction, i.e., the Z direction, and the other end abuts against the base 112. It is a rigid structure that can effectively support the tray 140.

[0089] In some possible embodiments provided by this utility model, reference is made to Figure 4 and combined Figure 1 The battery module located at the bottom layer has a third shoulder 1071. The third shoulder 1071 protrudes relative to the bottom battery module in the width direction, i.e., the X direction, and is fixedly connected to the base 112.

[0090] refer to Figure 4 For example, such as Figure 4 The first battery module 107 shown is the bottom battery module. The third shoulder 1071 protrudes from the bottom battery module along the width direction (X direction) toward the side away from the battery cell. The bottom battery module is fixedly connected to the base 112 via the third shoulder 1071.

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

[0092] In some possible embodiments, the third shoulder 1071 is provided with a third notch 1072. The first notch 2092 and the third notch 1072 are oppositely arranged along the height direction, i.e., the Z direction, and neither of them hinders the first connecting piece 106 from connecting the tray 104 and the base 112.

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

[0094] In some possible embodiments, referring to 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 in butt joint with the eighth through hole 1122. Referring to Figure 1 , the battery module at the bottom layer further includes a second connecting piece 110. Referring to Figure 1 and Figure 4 , the second connecting piece 110 passes through the seventh through hole 1075 and the eighth through hole 1122 to connect the battery module at the bottom layer to the base 112.

[0095] Exemplarily, the second connecting piece 110 is a bolt. The connection mode of the battery module at the bottom layer and the base 112 is set to be bolt fastening installation, which facilitates disassembly, is beneficial 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 arranged corresponding to the seventh through hole 1075 arranged on the third shoulder 1071 along the height direction, i.e., the Z direction. The second notch 1078 provides an operation space for the operator, which facilitates the operator to pass the second connecting piece 110 through the seventh through hole 1075 and the eighth through hole 1122 to realize the connection of the battery module at the bottom layer and the base 112.

[0097] The battery pack 10 with the multi-layer structure provided by the utility model is characterized in that the base 112 is connected with the tray 104 and the battery module located at the bottom layer at the same time.

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

[0099] In some possible embodiments provided by the utility model, the battery pack 10 with the multi-layer structure further comprises an upper cover 101. The upper cover 101 covers the battery box 108, so as to encapsulate the stacked assembly in the battery pack 10. The upper cover 101 of the battery pack 10 with the multi-layer structure is encapsulated with the battery box 108, so as to realize the sealed connection of the battery pack 10.

[0100] Referring to Figure 2 and Figure 3 , the specific assembly process of the battery pack 10 provided by the utility model is explained by taking the battery pack with the double-layer structure as an example.

[0101] Firstly, the battery module of each layer is grouped.

[0102] Referring to Figure 3 , the main components of the battery module of each layer include a plastic cover plate 201, a CCS 202 (Cells Contact System, i.e., a battery connection system), an output pole protection cover 203, an output pole base 204, a cross beam (an end cross beam 2051 and a middle cross beam 2052), a aerogel felt 206, a battery cell 207, an end insulation sheet 208, a longitudinal beam 209 and a cross-longitudinal beam connecting piece 210.

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

[0104] The end cross beam 2051, the end insulation sheet 208 and the longitudinal beam 209 are connected, and the middle cross beam 2052, the end insulation sheet 208 and the longitudinal beam 209 are connected. The longitudinal beam 209 is segmented extruded by an external extrusion tool. Specifically, as shown in Figure 3 the D1 region, the D2 region, the D3 region and the D4 region of the longitudinal beam 209 are extruded by the external extrusion tool respectively. The end cross beam 2051 and the longitudinal beam 209 and the middle cross beam 2052 and the longitudinal beam 209 are fastened and installed by using the cross-beam connecting piece 210.

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

[0106] After the production of each layer of the battery module is completed, the stacking installation is performed.

[0107] Reference Figure 2 The two-layer structure 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] The bottom of the battery box 108 is provided with a first cooling plate 109.

[0109] When the stacking of the stacked components in the battery pack 10 is performed, the third shoulder 1071 of the battery module 107 located at the bottom layer is fixedly installed with the base 112 of the battery box 108 through the second connecting piece 110, so as to realize the fixed installation of the battery module 107 located at the bottom layer on the battery box 108.

[0110] The tray 104 is placed on the second shoulder 1071 of the battery module 107 located at the bottom layer, so that the second shoulder 1071 bears the tray 104 above it. The tray 104 is fixedly installed with the base 112 of the battery box 108 through the first connecting piece 106, so as to realize the support of the base 112 to the tray 104.

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

[0112] Then, the first shoulder 2091 of the second battery module 103 is fixed on the tray 104 through the third connecting piece 111, so as to realize the fixed installation of the second battery module 103 and the tray 104.

[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. The installation of the double-layer structure battery pack is completed.

[0114] The battery pack 10 with the multi-layer structure provided by the utility model improves the grouping efficiency of the battery cells, and further realizes the improvement of the overall energy density under the same volume.

[0115] In some other possible embodiments, the battery pack includes three or more battery modules. Figure 2 The structure of the battery module at the top layer is the same as that of the second battery module 103 shown in the above Table 1. Figure 2 The structure of the battery module at the top layer is the same as that of the second battery module 103 shown in the above Table 1. Figure 2 The structure of the battery module at the top layer is the same as that of the second battery module 103 shown in the above Table 1.

[0116] The specific assembly method of the battery pack with three layers is also to complete the grouping 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 battery pack with the double-layer structure described above. The battery module at the bottom layer is installed on the base first. Then the tray is placed on the second shoulder of the battery module at the bottom layer, and the tray and the base are connected. Then the first shoulder of the battery module at the middle layer is fixedly connected with the tray. Another tray is placed on the second shoulder of the battery module at the middle layer, and the other tray and the base are connected. Then the first shoulder of the battery module at the top layer is fixedly connected with the other tray, and the stacking of the battery modules is completed.

[0117] The specific assembly method of the battery pack with three or more layers is similar to this, and thus is not described herein.

[0118] The battery pack 10 with the multi-layer structure provided by the utility model realizes the fixed installation of the multi-layer battery modules through the cell stacking frame structure (the cross beam and the longitudinal beam of each battery module) and the box support (i.e. the shoulder provided on each battery module), improves the stability of the structure of the battery pack, and the structural strength, and can effectively disperse the pressure borne by the battery module below, especially the battery module at the bottom layer, and solves the problem that the battery module at the bottom layer bears all the stress of the battery module above it.

[0119] In addition, the battery pack with the multi-layer structure is connected with the tray, the base and the battery module at the bottom layer through the non-module and the different through holes arranged on the base, the cell integration of the higher battery pack of the pickup truck and other light truck models is effectively improved, and the overall energy density of the battery pack is improved. In addition, the number of parts is greatly reduced, the series connection of the module and the module side plate is cancelled, the number of output base and output protection cover is reduced, and the product cost is effectively reduced. Meanwhile, the frame structure of each layer of battery module and the stacking of the multi-layer battery module are installed by bolts, the maintenance economy of the post-maintenance has good beneficial effects, and the manufacturing process is simple, and large-scale production is beneficial.

[0120] Although the utility model has been illustrated and described by referring to certain preferred embodiments of the utility model, those skilled in the art should understand that the above is the further detailed description of the utility model in combination with specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple inferences or replacements, without departing from the spirit and scope of the utility model.

Claims

1. A support structure for use in a battery pack of a multistory structure to support a plurality of battery modules stacked in a height direction, characterized by, The support structure comprises: a battery box comprising a base; a tray located between adjacent battery modules in the height direction, among the adjacent battery modules, the lower battery module supports the tray, and the tray supports the upper battery module; the base is separately connected with the tray to provide support for the tray.

2. The support structure of claim 1, wherein, The tray comprises: a plurality of tray cross beams arranged in the length direction; a tray longitudinal beam provided with a tray longitudinal beam top surface and a tray longitudinal beam bottom surface, wherein the bottom surface of the tray longitudinal beam is placed on the lower battery module to enable the lower battery module to support the tray; the top surface of the tray longitudinal beam supports and is connected with the upper battery module; each tray cross beam is connected with each tray longitudinal beam, and each tray cross beam is perpendicular to each tray longitudinal beam.

3. The support structure of claim 1, wherein, The support structure comprises: a plurality of cooling assemblies stacked in the height direction; wherein the cooling assembly comprises: a first cooling assembly provided on the base; a second cooling assembly integrated on the bottom surface of the tray; the cooling assembly is connected with a cooling system provided outside the battery pack.

4. The support structure of claim 3, wherein the second cooling assembly is integrated on the bottom surface of the tray through an integrated connector; the tray longitudinal beam is provided with a first hollow part corresponding to the position of the integrated connector, and the integrated connector passes through the tray longitudinal beam into the first hollow part; the tray cross beam is provided with a second hollow part corresponding to the position of the integrated connector, and the integrated connector passes through the tray cross beam into the second hollow part; and / or the first hollow part comprises at least one trapezoidal hollow structure, and the second hollow part comprises at least one trapezoidal hollow structure.

5. A multi-layered structural battery pack, characterized by, The support structure comprises: the support structure according to any one of claims 1 to 4, and a plurality of battery modules stacked in the height direction.

6. The multi-layered structural battery pack of claim 5, wherein, Each battery module comprises: a cell part comprising a plurality of cell groups arranged in the length direction, the cell part being provided with a first side surface and a second side surface arranged opposite in the length direction, and a third side surface and a fourth side surface arranged opposite in the width direction, the length direction, the width direction and the height direction being perpendicular to each other, a frame, the cell part being installed in the frame, the frame comprising: a plurality of cross beams arranged in the length direction, the cross beam comprising: an end cross beam provided on the outer side surface of the first side surface and the second side surface, respectively; a middle cross beam provided between each adjacent two cell groups, respectively; a longitudinal beam provided on the outer side surface of the third side surface and the fourth side surface, respectively; each longitudinal beam is connected with each cross beam.

7. The multi-layer structure battery pack of claim 5, wherein the upper battery module is provided with a first shoulder part protruding in the width direction relative to the upper battery module, and the first shoulder part is fixedly connected with the tray to enable the tray to support the upper battery module. The lower battery module is provided with a second shoulder portion protruding in the width direction relative to the lower battery module, and the second shoulder portion is used to support the tray.

8. The multi-layered battery pack of claim 7, wherein, The bottom surface of the tray beam is placed on the second shoulder portion, so that the second shoulder portion supports the tray; The top surface of the tray beam supports and connects with the first shoulder portion.

9. The multi-layered battery pack of claim 8, wherein, The tray is provided with a first through hole penetrating the tray in the height direction; The first shoulder portion is provided with a first notch; The second shoulder portion is provided with a second through hole penetrating the second shoulder portion in the height direction; The base is provided with a third through hole arranged in the height direction; The first through hole, the third through hole, the first notch and the second through hole are arranged opposite in the height direction; A first connecting member penetrates the first through hole, the second through hole and the third through hole to fixedly connect the tray and the base.

10. The multi-layered structural battery pack of claim 9, wherein, A support column is provided with a fourth through hole penetrating the support column in 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 in the height direction; The first connecting member penetrates the first through hole, the second through hole, the fourth through hole and the third through hole to fixedly connect the tray and the base.

11. The multi-layered structural battery pack of claim 5, wherein, The bottom layer battery module is provided with a third shoulder portion protruding in the width direction relative to the bottom layer battery module, and the third shoulder portion is fixedly connected with the base.

12. The multi-layered structural battery pack of claim 5, wherein, At least part of the longitudinal beams of the upper layer battery module is located at the intersection of the tray beams and the tray beams of the tray.

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