Storage battery assembly and motor vehicle

Abstract

According to one aspect of the present application, there is provided a battery assembly comprising: a tray; the heat insulation plate is contained in the tray, and a groove is formed in the heat insulation plate; the storage battery modules are arranged in the tray in an inverted mode and make contact with the heat insulation plate, and the adjacent storage battery modules are electrically connected through bus bars; and the bus bar is at least partially accommodated in the groove. According to another aspect of the present application, a motor vehicle having the battery assembly described above and a method of forming a battery pack assembly are also provided.

Description

Technical Field

[0001] The present application generally relates to the technical field of vehicle batteries, and more specifically, to a battery assembly and a motor vehicle. Background Art

[0002] With the development of consumers' demand for vehicle fuel saving and environmental protection in the current market, various new energy vehicles, including but not limited to pure electric vehicles (BEV), hybrid electric vehicles (HEV) and plug-in hybrid electric vehicles (PHEV), are becoming more and more popular. These new energy vehicles will become one of the important trends in the future development of the automotive industry due to their advantages of fuel saving, environmental protection and economy.

[0003] Most new energy vehicles have a battery assembly, which is usually composed of a plurality of battery arrays to provide power to the vehicle's electric motor, so that the electric motor alone or together with the vehicle's engine provides driving power to the vehicle.

[0004] A battery assembly usually includes multiple battery modules, most of which are installed in a battery housing composed of a tray and a cover, and the multiple battery modules are packaged together in the battery assembly through a variety of supporting structures in the housing (such as frames, fasteners, bolts, rods, gaskets, rails, walls, plates, brackets, strapping pieces, etc.). When using these types of supporting structures and fixing structures for battery packaging, the battery packaging process may be cumbersome and may cause dimensional deviations of the battery assembly, making packaging challenging.

[0005] Application Contents

[0006] This disclosure summarizes various aspects of the embodiments and should not be used to limit the claims. Other embodiments are conceivable based on the technology described herein, which will be apparent to those of ordinary skill in the art after studying the following drawings and detailed descriptions, and these embodiments are intended to be included within the scope of this application.

[0007] According to one aspect of the present application, a battery assembly is provided, the battery assembly comprising:

[0008] tray;

[0009] A heat insulation board, the heat insulation board is accommodated in the tray and a groove is provided on the heat insulation board;

[0010] A battery module is disposed upside down in the tray and in contact with the heat shield, wherein adjacent battery modules are electrically connected via a bus bar; and

[0011] The bus bar is at least partially received in the groove.

[0012] In one embodiment, a cooling plate is further included, and the cooling plate is connected to the tray to form a housing of the battery assembly.

[0013] In another embodiment, a thermally conductive interface material is further included, and the thermally conductive interface material is disposed between the cooling plate and the battery module.

[0014] In yet another embodiment, wherein the tray has a bottom wall and end walls and side walls extending upwardly from the bottom wall and disposed oppositely;

[0015] The tray also contains:

[0016] a separator beam extending between the end walls; and

[0017] A support beam extends between the side walls.

[0018] In yet another embodiment, the separation beam is disposed on the bottom wall and supports the support beam.

[0019] In yet another embodiment, the separation beams and the support beams form a plurality of receiving portions in the tray, wherein each receiving portion is configured to receive one or more battery modules.

[0020] In yet another embodiment, a plurality of heat insulation plates are respectively disposed between the bottom wall and the battery module in each receiving portion.

[0021] In yet another embodiment, the bottom of the groove of the insulation board abuts against the bottom wall; and the bottom wall has a protrusion extending toward the insulation board outside the position area corresponding to the groove, and the protrusion is configured to abut against the insulation board.

[0022] In yet another embodiment, the busbar includes a main body and connecting ends on both sides of the main body, and the connecting ends are respectively connected to the main body through arms.

[0023] In yet another embodiment, the busbars are adapted to the shape of the grooves and the body is received in the grooves, and each busbar is configured to electrically connect two battery modules.

[0024] In yet another embodiment, wherein the arm is configured as an elastic arm, the elastic arm is compressed and restored in the longitudinal direction.

[0025] In yet another embodiment, the connection end includes connection holes, and the connection holes are configured to respectively receive poles of adjacently arranged battery modules.

[0026] In yet another embodiment, the thermal insulation board has a substantially uniform thickness.

[0027] In yet another embodiment, the battery module comprises independent single cells, wherein the groove at least extends across two single cells.

[0028] In yet another embodiment, the battery module comprises a plurality of battery cells, wherein the groove extends across at least two battery modules.

[0029] In yet another embodiment, the support beam is fixedly connected to the side wall and is arranged to form a second gap with the bottom wall.

[0030] In yet another embodiment, the busbars are disposed in the grooves of adjacent heat insulation plates through the second gap to connect the battery modules disposed on both sides of the support beam.

[0031] In yet another embodiment, the elastic arm is compressed when the battery module abuts against the connection terminal.

[0032] According to another aspect of the present invention, there is also provided a motor vehicle having the battery assembly described above.

[0033] According to another aspect of the present invention, there is also provided a method for forming a battery pack assembly, comprising:

[0034] Providing a battery pack housing;

[0035] Providing a heat shield within the battery pack housing, wherein the heat shield comprises a plurality of grooves;

[0036] providing a bus bar within the recess;

[0037] One or more battery modules are placed within the battery pack housing such that the bus bars make electrical contact with the electrode terminals of the battery modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] For a better understanding of the present application, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily drawn to scale, and related elements may be omitted, or in some cases the scale may have been exaggerated in order to emphasize and clearly illustrate the novel features described herein. In addition, as is known in the art, the system components may be arranged differently. Moreover, in the drawings, throughout the several views, the same reference numerals represent corresponding parts.

[0039] Figure 1 is an exploded schematic diagram of a battery assembly according to an embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of a tray portion of a battery assembly according to an embodiment of the present invention;

[0041] Figure 3is a cross-sectional schematic diagram of a busbar mounting structure of a battery assembly according to an embodiment of the present invention;

[0042] Figure 4 is a cross-sectional schematic diagram of a busbar mounting structure of a battery assembly according to another embodiment of the present invention;

[0043] Figure 5 is a schematic structural diagram of a groove provided on a heat insulation board according to an embodiment of the present invention;

[0044] Figure 6 is a cross-sectional schematic diagram of a busbar mounting structure of a battery assembly according to another embodiment of the present invention;

[0045] Figure 7 is a schematic diagram of electrical connection between a battery module and a bus bar of a battery assembly according to an embodiment of the present invention;

[0046] Figure 8 It is a schematic flow chart of a method for forming a battery pack assembly according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] Embodiments of the present disclosure are described below. However, it should be understood that the disclosed embodiments are merely examples, and other embodiments may take various alternative forms. The drawings are not necessarily drawn to scale; certain features may be exaggerated or minimized to show the details of specific components. Therefore, the specific structural and functional details disclosed herein should not be interpreted as limiting, but merely as a representative basis for teaching those skilled in the art to use the present application in various ways. As will be understood by those of ordinary skill in the art, the various features shown and described with reference to any one of the figures may be combined with the features shown in one or more other figures to produce embodiments that are not explicitly shown or described. The combination of features shown provides representative embodiments for typical applications. However, various combinations and modifications of features consistent with the teachings of the present disclosure may be desirable for certain specific applications or embodiments.

[0048] In order to simplify the battery packaging process and reduce the size deviation of the battery assembly during the assembly process, the present invention provides a battery assembly 10. Figure 1As shown, in a non-limiting embodiment of the present invention, the battery assembly 10 includes a tray 12, and the tray 12 is arranged at the bottom of the battery assembly 10. The tray 12 has two side walls 121 extending in a first direction X and two end walls 122 extending in a second direction Z. A partition beam 124 extending between the two end walls 122 and a support beam 123 extending between the two side walls 121 are arranged in the tray 12. The two ends of the support beam 123 are fixedly connected to the two side walls 121 by fasteners or welding or other fixed connection methods known in the art. It can be understood that the support beam 123 and the partition beam 124 can also be integrally formed with the tray 12 by pressing and other processes. In this embodiment, the partition beam 124 is fixedly arranged on the bottom wall 126 of the tray 12, and the support beam 123 is arranged above the partition beam 124 and fixedly connected to the partition beam 124 at the intersection of the two. In this way, the support beam 123 is fixedly connected to the side wall 121 and the partition beam 124 respectively, thereby enhancing the load-bearing capacity and structural rigidity of the support beam 123 .

[0049] Then as Figure 1 and Figure 2 As shown, a partition beam 124 and a plurality of support beams 123 - five in this embodiment, it is understood that the number of support beams 123 can be adjusted according to the number of battery modules 15 to be arranged and the requirements of structural rigidity - a plurality of accommodating portions 125 for the battery modules 15 are formed in the tray 12, and the volume of each accommodating portion 125 is set according to the volume of the battery module 15. Figure 1 and 2 In the illustrated embodiment, the volume of each receiving portion 125 is respectively configured to accommodate one or two battery modules 15. It is understood that in one embodiment of the present invention, the battery module 15 may be a single cell that is independent of each other, and in other embodiments, the battery module 15 may also include a plurality of single cells encapsulated by a battery housing.

[0050] Then as Figure 1 As shown, a heat insulation board 13 is respectively arranged in each receiving portion 125. In the embodiment of the present invention, the heat insulation board 13 is made of mica material. The heat insulation board 13 made of mica material is used in the power battery system of the vehicle, which can achieve the effect of insulation and heat insulation, slowing down or blocking the spread of thermal runaway events. In this embodiment, each heat insulation board 13 is respectively adapted to the shape of the bottom of each receiving portion 125, so that each heat insulation board 13 is respectively arranged in each receiving portion 125. The heat insulation board 13 has a substantially uniform thickness as a whole, so that it can be conveniently and flatly arranged in each receiving portion 125.

[0051] like Figure 2As shown, each heat insulation board 13 is provided with a groove 131, and the groove 131 is formed by mechanical processing. In an embodiment of the present invention, the groove 131 is configured to extend across at least two independent single cells or two battery modules 15. It is understandable that in other embodiments, the groove 131 can be configured to extend across multiple single cells or battery modules 15. In one embodiment of the present invention, the heat insulation board 13 is a mica board. During the production process of the mica board, multiple layers of mica paper are stacked and pressed. After the pressing of the mica board is completed, the edge is trimmed to ensure the flatness of the edge of the mica board. Subsequently, the mica board is cut by laser cutting to obtain the groove 131. In another embodiment of the present invention, the mica board is mainly composed of a mica base board and a resin layer. The resin layer is molded onto the mica base board by a molding device so that the two are tightly connected and fit. Subsequently, the groove 131 is opened on the mica board by stamping. Those skilled in the art will appreciate that the above-mentioned methods of making the mica board and forming the grooves are exemplary and do not constitute limitations on the materials and processing methods of the heat insulation board 13 of the present invention.

[0052] Continue to refer Figure 2, the position of the groove 131 is determined according to the position of the bus bar 16 of the battery module 15. The battery assembly 10 of this embodiment includes a plurality of battery modules 15. Each battery module 15 is composed of a plurality of battery cells arranged along the second direction Z and encapsulated in the housing of the battery module 15. In an embodiment of the present invention, the battery module 15 is arranged inverted, that is, the electrical connection components (such as poles) of the battery module 15 are arranged toward the bottom wall 126 of the tray 12. The battery modules 15 are electrically connected to each other through the bus bar 16, and the bus bar 16 is arranged in the groove 131 of each insulation board 13. In this embodiment, when the battery module 15 is placed inverted in the accommodating portion 125 of the tray 12, the upper surfaces of adjacent battery modules 15 are in contact with the bus bar 16 arranged in the groove 131 to achieve electrical connection between adjacent battery modules 15. In the specific embodiment described, the bus bar 16 is at least partially accommodated in the groove 131, and the two ends of the bus bar 16 extend out of the groove 131 and are electrically connected to the electrode terminals of the battery module 15. The groove 131 may at least partially span two battery cells, and the connection of the two single cells is completed by the bus bar 16 located therein. In the present embodiment, the groove 131 may at least partially span two battery modules to complete the connection of the two battery modules. In other embodiments, the bus bar 16 may be completely located in the groove 131. In one or more embodiments herein, the groove 131 may face a portion of the two battery cells and span the exhaust valves of at least two battery cells. In other positions, the groove 131 may face the adjacent electrode terminals of the two battery cells without spanning the exhaust valve of any battery cell. In one or more embodiments, other battery cells may not correspond to any position of the groove 131. Compared with the prior art method of fixing the poles and busbars 16 of the battery module 15 by fasteners, the battery module 15 is inverted to rely on its own gravity to achieve close engagement between the poles and the busbars 16, thereby achieving electrical connection with the busbars 16. This simplifies the packaging process of the battery assembly 10, reduces the use of fasteners, and saves packaging costs. In addition, such a packaging method can also reduce the overall height of the battery assembly 10, making it more suitable for power batteries for small and medium-sized vehicles. In this embodiment, the battery module 15 is supported by a partition beam 124 and a support beam 123. In addition, each busbar 16 only needs to electrically connect two adjacent battery modules 15, without considering the positions of all battery modules 15, thereby reducing the requirements for assembly tolerances.

[0053] Combination Figure 1 and Figure 2 Please refer to the attached Figure 3In two adjacent receiving portions 125 separated by the support beam 123, the battery modules 15 in the adjacent receiving portions 125 can also be electrically connected through the bus bar 16. Figure 2 and Figure 3 As shown, the support beam 123 is supported by the partition beam 124 disposed on the bottom wall 126 of the tray 12 and a second gap H is formed between the bottom surface of the support beam 123 and the bottom wall 126 of the tray 12. Figure 3 In the illustrated embodiment, the second gap H allows the busbars 16 to be disposed in the grooves 131 opened in adjacent heat insulation plates 13 through the second gap H during installation, thereby achieving connection between adjacent battery modules 15 through the connection holes 164 of the busbars 16 .

[0054] Continue as Figure 3 As shown, in one embodiment of the present invention, the busbar 16 has a main body 161 and connecting ends 162 on both sides of the main body 161, and the connecting ends 162 are connected to the main body 161 through arms 163. The connecting ends 162 are used to connect to the poles of the battery modules 15, so as to achieve electrical connection between different battery modules 15. In this embodiment, the busbar 16 is integrally formed. The busbar 16 is adapted to the shape of the groove 131 as a whole, so that the busbar 16 can be installed in the groove 131 and its movement in the first direction X and the second direction Z is restricted by the groove 131. In this embodiment, the groove 131 spans across two battery modules separated by a support beam, completing the connection between different modules without affecting the overall strength of the battery pack. As shown in the figure, the groove 131 is opposite to the bottom of the support beam. In one embodiment of the present invention, Figure 3 As shown, the arm 163 of the bus bar 16 is configured as an elastic arm, and a bending section is provided on the arm 163 so that the arm 163 has elasticity in the third direction Y, so that the arm 163 can be compressed in the third direction Y when pressed by the battery module 15, and can be reset when the battery module 15 is removed. In this embodiment, the bus bar 16 is configured to extend beyond the surface of the heat insulation board 13 in the third direction Y to a greater height than the distance between the battery module 15 and the surface of the heat insulation board 13 when the battery module 15 is installed, so that after the battery module 15 is installed upside down, pressure can be applied to the bus bar 16 in the third direction Y, so that the battery module 15 can be tightly engaged with the bus bar 16 and the assembly tolerance in the third direction Y is eliminated. Figure 6In another embodiment of the present invention shown, the arm 163 of the bus bar 16 does not have an elastic structure. In this embodiment, the bus bar 16 is adapted to the shape of the groove 131, and the bus bar 16 is arranged in the groove 131. When the battery module 15 is arranged inverted, the battery module 15 contacts the connecting end 162 of the bus bar 16 to press the bus bar 16 and insert the pole of the battery module 15 into the connecting hole 164 of the connecting end 162 to achieve electrical connection between different battery modules 15.

[0055] Next reference Figure 4 The busbar mounting structure of the battery assembly in another embodiment shown in the figure, in this embodiment, the bottom of the groove 131 on the heat shield 13 abuts against the bottom wall 126 of the tray 12, and except for the position of the groove 131, there is a first gap h between the lower surface of the rest of the heat shield 13 and the bottom wall 126. The bottom wall 126 has a plurality of protrusions 127 extending upward, and the plurality of protrusions 127 are arranged to abut against other areas of the heat shield 13 except for the position of the groove 131 and the lower surface of the heat shield 13, thereby enhancing the strength and stability of the heat shield 13. As described above, Figure 3 As described above, the battery module 15 is invertedly arranged in the receiving portion 125 and abuts against the heat insulation board 13, and the bottom wall 126 with the protrusion 127 provides better support performance for the heat insulation board 13. It can be understood by those skilled in the art that the number of the protrusions 127 can be set according to the thickness of the heat insulation board 13 and / or the weight of the battery module 15.

[0056] exist Figure 5 In the illustrated embodiment, the angle α between the bottom and the side wall of the groove 131 provided on the heat insulation board 13 is an angle greater than 90°. Compared with the groove 131 having a right angle bottom angle of 90°, the angle greater than 90° makes the groove 131 easier to process and reduces the difficulty of processing. It also makes the angle between the main body 161 and the arm 163 of the bus bar 16 adapted to the groove 131 greater than 90°. As described in the above embodiment, when the battery module 15 is invertedly pressed on the bus bar 16, it will contact the upper surface of the connecting end 162 of the bus bar 16 to apply a downward force F. When the angle between the main body 161 and the arm 163 is greater than 90°, the connecting end 162 of the bus bar 16 is moved laterally outward and the connecting end 162 of the bus bar 16 is pressed on the upper surface of the heat insulation board 13. In the above manner, the accuracy requirement for the angle between the main body 161 and the arm 163 when processing the bus bar 16 can be reduced. In some other embodiments, the groove 131 has a stepped structure, and the bus bar 16 is shown in a stepped shape that fits the stepped structure. The stepped structure enables the bus bar 16 to be accurately positioned and not easily moved, thereby making the connection more convenient and stable to a certain extent.

[0057] Then refer to the attached Figure 7 , which shows the connection between the connection hole 164 on the connection end 162 of the bus bar 16 and the pole of the battery module 15. As described above, by setting the bus bar 16 in the groove 131 and setting the battery module 15 upside down, the battery module 15 can insert the pole into the connection hole 164 of the connection end 162 of the bus bar 16 through contact with the bus bar 16, and the battery module 15 and the bus bar 16 can be tightly connected by the gravity of the battery module 15 to achieve electrical connection between the battery modules 15. This connection method can achieve a tight connection between the bus bar 16 and the battery module 15 on the one hand, and on the other hand, it is no longer necessary to use fasteners to fix the pole and bus bar of the battery module 15, which simplifies the assembly process and reduces the longitudinal height of the battery assembly 10.

[0058] Continue to refer Figure 1 The battery assembly 10 of the present invention further includes a thermally conductive interface material 14 disposed above the battery module 15. In an embodiment of the present invention, the thermally conductive interface material 14 may be a gel-like thermally conductive interface material, which is disposed between the battery module 15 and the cover plate 11 of the battery assembly 10, and can be well bonded between the housing of the battery module 15 and the cover plate 11 of the battery assembly 10 so as to achieve good heat conduction of the battery module 15. In addition, in an embodiment of the present invention, the cover plate 11 is embodied as a cooling plate, which is fixedly connected to the tray 12 on the one hand to achieve the packaging of the battery assembly 10, that is, used as the outer shell of the battery assembly 10. On the other hand, a plurality of fluid channels (not shown in the figure) are provided in the cooling plate 11. In one or more embodiments of the present invention, the fluid channels are formed while the cooling plate 11 is extruded. The fluid channels may be connected to a pump so that a cooling fluid passes through the fluid channels to perform thermal management on the battery assembly 10. In one or more embodiments of the present invention, the cooling fluid may be a low-conductivity coolant. By arranging the cover plate 11 as a cooling plate, the cooling plate can be directly exposed to the outside air to achieve better heat exchange with the outside air. In addition, when the vehicle is started, the flowing outside air can also bring better heat dissipation effect to the cooling plate.

[0059] In addition, a plurality of reinforcing ribs extending along the direction of the fluid channel may be provided in the cooling plate 11. In one or more embodiments of the present invention, the reinforcing ribs extend along the entire surface of the cooling plate 11 and may serve to separate the fluid channel. The reinforcing ribs not only serve as separators of the fluid channel but also increase the structural strength of the cooling plate 11, thereby improving the overall rigidity of the housing of the battery assembly 10.

[0060] The present invention also provides a motor vehicle using the battery assembly 10 described above, the motor vehicle including but not limited to a pure electric vehicle (BEV), a hybrid electric vehicle (HEV), and a plug-in hybrid electric vehicle (PHEV).

[0061] like Figure 8 As shown, the present invention proposes a Figure 1 The flowchart 800 of the molding method of the battery pack assembly shown in the figure comprises: in frame 801, a battery pack shell is provided, and the battery pack shell includes a cover plate 11 and a tray 12. Then in frame 802, a heat insulation board 13 is provided in the tray 12 of the battery pack shell, and the heat insulation board 13 is arranged in the receiving portion 125 formed by the support beam 123 and the partition beam 124 in the tray 12, wherein the heat insulation board 13 includes a plurality of grooves 131 arranged thereon. Next, in frame 803, the busbars 16 are respectively positioned in the corresponding grooves 131, and the grooves 131 are arranged to cross and connect at least two battery modules 15. Subsequently, in frame 804, one or more battery modules 15 are placed in the receiving portion 125 in the battery pack shell, so that the busbar 16 forms an electrical contact with the electrode terminal of the corresponding battery module 15. After completing the above steps, in frame 805, the cover plate 11 and the tray 12 are connected by fasteners to complete the molding process of the entire battery pack. It is understandable that in other embodiments, one or more steps may be combined or the order may be changed without departing from the spirit of the present solution. For example, a bus bar may be provided in one or more grooves of the heat insulation board while providing the heat insulation board.

[0062] Through the above-mentioned molding process, the battery module 15 is placed upside down in the assembly step inside the battery pack shell so that the electrode terminals of the battery module 15 are electrically connected to the bus bar 16 at the corresponding position and the weight of the battery module 15 keeps the two in close fit, thereby eliminating the fasteners and fastening process for electrical connection between the bus bar 16 and the battery module 15, thereby saving assembly time and simplifying the assembly steps.

[0063] In this application, the use of disjunctive conjunctions is intended to include conjunctions. The use of definite or indefinite articles is not intended to indicate cardinality. In particular, reference to "the" object or "a" and "an" objects is intended to represent a possible one of a plurality of such objects. In addition, the conjunction "or" may be used to convey simultaneous features, rather than mutually exclusive solutions. In other words, the conjunction "or" should be understood to include "and / or". The term "include" is inclusive and has the same scope as "comprise".

[0064] The above embodiments are possible examples of implementation methods of the present application, and are only given to enable those skilled in the art to clearly understand the principles of the present application. Those skilled in the art should understand that the above discussion of any embodiment is only exemplary and is not intended to imply that the scope disclosed in the embodiments of the present application (including claims) is limited to these examples; under the overall concept of the present application, the technical features in the above embodiments or different embodiments can also be combined with each other, and produce many other changes in different aspects of the embodiments of the present application as described above, which are not provided in the specific implementation method for simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection required by the present application.

Claims

1. A battery assembly, wherein: The battery assembly comprises: tray; a heat insulation board, the heat insulation board being received in the tray and having a groove arranged on the heat insulation board; a battery module, the battery module being disposed upside down in the tray and in contact with the thermal insulation plate, wherein adjacent battery modules are electrically connected via a bus bar; and The bus bar is at least partially received in the groove.

2. The battery assembly according to claim 1, wherein: Also included is a cooling plate connected to the tray to form a housing for the battery assembly.

3. The battery assembly according to claim 2, wherein: The invention also comprises a thermally conductive interface material, wherein the thermally conductive interface material is arranged between the cooling plate and the battery module.

4. The battery assembly according to claim 1, wherein: The tray has a bottom wall and end walls and side walls extending upward from the bottom wall and arranged opposite to each other; and The tray also includes: a separator beam extending between the end walls; A support beam extends between the side walls.

5. The battery assembly according to claim 4, wherein: The partition beam is disposed on the bottom wall and supports the support beam.

6. The battery assembly according to claim 5, wherein: The separation beams and the support beams form a plurality of receiving portions in the tray, wherein each receiving portion is configured to receive one or more battery modules.

7. The battery assembly according to claim 6, wherein: A plurality of heat shields are respectively disposed between the bottom wall and the battery module in each accommodation portion.

8. The battery assembly according to claim 7, wherein: The bottom of the groove of the insulation board abuts against the bottom wall; and the bottom wall has a protrusion extending toward the insulation board outside the position area corresponding to the groove, and the protrusion is configured to abut against the insulation board.

9. The battery assembly according to claim 7, wherein: The bus bar includes a main body and connecting ends at both sides of the main body, and the connecting ends are respectively connected to the main body through arms.

10. The battery assembly according to claim 9, wherein: The bus bars are adapted to the shape of the grooves and the body is received in the grooves, and each of the bus bars is configured to electrically connect two of the battery modules.

11. The battery assembly according to claim 9, wherein: The arm is configured as an elastic arm which is compressed and restored in the longitudinal direction.

12. The battery assembly according to claim 10 or 11, wherein: The connection end includes a connection hole, and the connection hole is configured to respectively receive the poles of the adjacently arranged battery modules.

13. The battery assembly according to claim 1, wherein: The thermal insulation board has a substantially uniform thickness.

14. The battery assembly according to claim 1, wherein: The battery module comprises independent single cells, wherein the groove at least extends across two single cells.

15. The battery assembly according to claim 1, wherein: The battery module includes a plurality of single cells, wherein the groove extends across at least two battery modules.

16. The battery assembly according to claim 5, wherein: The support beam is fixedly connected to the side wall and is arranged to form a second gap with the bottom wall.

17. The battery assembly according to claim 13, wherein: The bus bar is disposed in the groove of the adjacent heat insulation plate through the second gap to connect the battery modules disposed on both sides of the support beam.

18. The battery assembly according to claim 11, wherein: The elastic arm is compressed when the battery module abuts against the connection end.

19. A motor vehicle, wherein: The motor vehicle comprises a battery assembly as claimed in any one of claims 1-18.

20. A method for forming a battery pack assembly, comprising: Providing a battery pack housing; providing a thermal insulation plate within the battery pack housing, wherein the thermal insulation plate comprises a plurality of grooves; providing a bus bar within the recess; One or more battery modules are placed within the battery pack housing such that the bus bars make electrical contact with electrode terminals of the battery modules.

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