Battery pack and automobile

Abstract

The application relates to a battery pack and an automobile, which comprise a box body, a wire harness and a plurality of cell assemblies are arranged in the box body, a reinforcing beam fixed with the box body is arranged at the bottom of the space between adjacent cell assemblies, a pressing strip is arranged between the top surfaces of the adjacent cell assemblies, the pressing strip comprises a horizontal part, vertical parts extending upwards are arranged at the two ends of the horizontal part to form a U-shaped structure, the horizontal part is in contact with and fixedly connected with the top surface of the reinforcing beam, the space between the two vertical parts contains the wire harness, the top end of at least one vertical part is provided with a turned-up edge to form a pressing part, and the pressing part covers the edge of the top surface of the cell assembly, the pressing strip of the battery pack can realize multidirectional constraint on the cells, and the constraint reliability is high.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, specifically to a battery pack and an automobile. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] As the core component of electric vehicles, the power battery module is composed of numerous battery cells. To ensure the stability of the cells, after they are fixed with structural adhesive, some designs use a clamping strip structure to press and fix the cells in order to increase structural strength and control cell collisions. Currently, there is a type of battery in which the clamping strip has a limiting protrusion that extends into the gap between two adjacent rows of cells. A fastening bolt passes through the bottom of the limiting protrusion and the internal reinforcing beam of the battery pack. In the above-mentioned battery pack, because there is a large gap between the limiting protrusion and the reinforcing beam, a long fastening bolt is required. Firstly, under long-term vibration conditions, the preload of the fastening bolt will decrease, resulting in a decrease in the constraint force of the clamping strip on the cells. During vehicle acceleration, braking, turning, and especially collisions, the unconstrained cells will squeeze, rub, or impact each other, which may lead to cell shell cracking, internal core deformation, separator puncture, and internal short circuits, etc. The reduced overall structural rigidity of the battery pack leads to changes in vibration modes, increased abnormal noise, and affects the NVH quality of the entire vehicle. If bushings are used to solve this problem, it will increase the number of battery pack components and increase assembly difficulty. Secondly, in the aforementioned battery pack, due to the large space between the pressure strip and the reinforcing beam, it can only be fixed by fastening bolts, and other fixing methods cannot be used. Thirdly, the space between the adjacent rows of cells is equipped with fastening bolts and bushings, which means that the battery pack wiring harness can only be arranged on the outside, reducing the space utilization of the battery pack and increasing the overall volume of the battery pack. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a battery pack and automobile that overcome the defects of the aforementioned battery pack.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, embodiments of the present invention provide a battery pack, including a housing, inside which a wiring harness and multiple rows of battery cell assemblies are provided. A reinforcing beam fixed to the housing is provided at the bottom of the space between adjacent rows of battery cell assemblies. A pressure strip is provided between the top surfaces of adjacent rows of battery cell assemblies. The pressure strip includes a horizontal portion, and vertical portions extending upward at both ends of the horizontal portion to form a U-shaped structure. The horizontal portion contacts and is fixedly connected to the top surface of the reinforcing beam. The space between two vertical portions accommodates the wiring harness. At least one vertical portion has a flange at its top end to form a pressing portion, which covers the edge of the top surface of the battery cell assembly.

[0006] Optionally, the horizontal part is fixedly connected to the top surface of the reinforcing beam by bolts, rivets, or structural adhesive.

[0007] Optionally, the horizontal part is fixed to the top surface of the reinforcing beam by bolts or rivets. The horizontal part is provided with fixing holes that match the bolts or rivets, and the thickness of the horizontal part at the fixing holes is greater than the thickness of the rest of the horizontal part.

[0008] Optionally, the thickness of the horizontal portion at the fixing hole is 18mm-22mm, preferably 20mm.

[0009] Optionally, the pressing part is in direct contact with the top surface of the battery cell assembly; or; A buffer pad is provided between the pressing part and the top surface of the battery cell assembly; or; Structural adhesive is provided between the pressing part and the top surface of the battery cell assembly.

[0010] Optionally, the pressure strip is made of aluminum alloy or composite material.

[0011] Optionally, the surface of the pressure strip is coated with an anti-corrosion and insulating coating.

[0012] Optionally, the horizontal section is provided with multiple wire harness clips, through which the wire harness passes and is secured.

[0013] Optionally, a plurality of reinforcing ribs are provided between the vertical part and the horizontal part.

[0014] Secondly, embodiments of the present invention provide an automobile equipped with the battery pack described in the first aspect.

[0015] The beneficial effects of this invention are as follows: The battery pack of the present invention includes a pressure strip comprising a horizontal portion and vertical portions at both ends. The top of the vertical portions has a flange to form a pressing portion. The horizontal portion of the pressure strip contacts and is fixed to the top surface of the reinforcing beam, forming a U-shaped structure. This significantly improves the structural rigidity of the pressure strip, effectively distributing the load of the reinforcing beam. Simultaneously, the U-shaped structure of the pressure strip absorbs energy through plastic deformation upon lateral impact, while maintaining constraint on the battery cells, ensuring the multi-dimensional constraint capability of the pressure strip on the cells. Furthermore, the U-shaped structure formed by the horizontal and vertical portions suppresses the transmission of high-frequency vibrations, increasing the first-order mode frequency of the battery pack. The horizontal part of the pressure strip directly contacts and is fixed to the top surface of the reinforcing beam. On the one hand, this can greatly shorten the length of the bolt shank, making the bolt less prone to loosening under vibration conditions, thus ensuring the constraint force on the battery cell. When the pressure strip and the reinforcing beam are connected, there is no need to use bushings, reducing the number of parts. On the other hand, a space for accommodating the wire harness can be formed between the two vertical parts, eliminating the need for the wire harness to be placed on the outside of the battery cell, improving the space utilization of the enclosure and reducing the overall volume of the battery pack. Thirdly, the pressure strip can be fixed to the top surface of the reinforcing beam using rivets or structural adhesive, allowing for multiple ways to fix the pressure strip to the reinforcing beam, thus improving the applicability to processing technology. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a partial enlarged view of the mating point between the pressure strip, the reinforcing beam, and the battery cell assembly in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the pressure strip structure in Embodiment 1 of the present invention; Among them, 1. enclosure, 2. battery cell assembly, 3. reinforcing beam, 4. wiring harness, 5. pressure strip, 6. wiring harness clip, 7. ceramic fiber cloth; 5-1. Horizontal part, 5-2. Vertical part, 5-3. Pressing part. Detailed Implementation

[0018] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] For ease of description, the words "upper" and "lower" appearing in this invention only indicate that they are consistent with the upper and lower directions of the accompanying drawings and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In this embodiment, the X direction is the length direction of the vehicle, the Y direction is the width direction of the vehicle, and the Z direction is the vertical direction.

[0022] Example 1 This embodiment provides a battery pack, such as Figures 1-3 As shown, the device includes a housing 1, inside which are multiple rows of battery cell assemblies 2. Each row of battery cell assemblies 2 consists of multiple battery cells. The bottom surface of each battery cell assembly 2 is bonded to the bottom surface of the internal cavity of the housing 1 with structural adhesive. A space is provided between two adjacent rows of battery cell assemblies 2, and a reinforcing beam 3 is provided at the bottom of the space. The bottom end of the reinforcing beam 3 is fixedly connected to the housing 1. The reinforcing beam 3 and the housing 1 are connected by bolts, screws, or welding. Preferably, the reinforcing beam 3 is welded to the housing 1. The reinforcing beam 3 is used to increase the structural strength of the entire housing 1. Especially in the event of a side collision or bottom impact, it can effectively disperse local loads and prevent excessive deformation of the housing 1 from damaging the battery cells. A wiring harness 4 is also provided inside the housing. The wiring harness 4 can be installed using existing technology and will not be described in detail here.

[0023] The above structure can be achieved using existing battery pack technology, and further technical details will not be described in detail here.

[0024] A pressure strip 5 is provided between the top surfaces of two adjacent rows of battery cell assemblies. The pressure strip 5 presses the battery cell assembly 2 tightly, increasing the fixing strength of the battery cell assembly 2 and improving the anti-collision performance of the battery cell assembly 2.

[0025] During vehicle operation, especially when cornering at high speed, braking suddenly, or encountering bumpy roads, the battery cells will be subject to inertial forces and tend to shift relative to each other. If there is no effective constraint, it may lead to friction between the battery cells, short circuit, or even thermal runaway. Therefore, by applying pressure to the battery cells through the pressure strip 5, the relative displacement tendency of the battery cells can be effectively constrained, ensuring the safety of the battery pack.

[0026] Traditional battery pack straps are made of plastic materials, metal materials or composite materials. Due to insufficient material strength, plastic straps can only provide limited restraint force to the battery cell assembly in the Z direction (vertical direction), and have poor restraint effect in the Y direction (horizontal direction). Moreover, they are prone to creep or aging under long-term vibration and temperature change environments, resulting in a decrease in pre-tightening force and loss of effective restraint on the battery cell assembly. Especially in high-energy density battery packs, there are many battery cells and they are arranged closely, which requires higher mechanical properties of the straps. Traditional plastic straps are difficult to meet the requirements. Therefore, in this embodiment, the strap adopts a metal strap or a composite material strap. Preferably, a metal strap is used. The strap 5 in this embodiment adopts an aluminum alloy strap, which has high structural strength and high mechanical properties, meets the usage requirements under long-term vibration or temperature change environments, and is also convenient for processing and manufacturing with low processing costs.

[0027] In order to improve the restraint ability of the strap 5 in the X, Y, and Z directions of the vehicle, in this embodiment, the strap 5 is designed as a "ji" - shaped structure, including a horizontal part 5 - 1. Both ends of the horizontal part 5 - 1 are provided with vertical parts 5 - 2 extending upward. A U - shaped structure is formed between the horizontal part 5 - 1 and the two vertical parts 5 - 2. The U - shaped structure is arranged between two adjacent columns of battery cell assemblies 2. Through the U - shaped structure, the Y - direction movement of the battery cell assembly 2 can be restricted.

[0028] At least one top end of the vertical part 5 - 2 is provided with a flanging extending outward to form a pressing part 5 - 3. The pressing part 5 - 3 is perpendicularly arranged with respect to the vertical part 5 - 2 so that the entire lower surface of the pressing part 5 - 3 can cooperate with the top surface of the battery cell assembly 2. The pressing part 5 - 3 covers the side edge of the top surface of the battery cell assembly 2, applies a downward pressure to the battery cell assembly 2, and presses the battery cell assembly 2 tightly to restrict the Z - direction displacement of the battery cell assembly 2.

[0029] In this embodiment, both top ends of the two vertical parts 5 - 2 are provided with flangings extending outward to form pressing parts 5 - 3. The horizontal part 5 - 1 is in contact with the top surface of the reinforcing beam 3 and is fixedly connected to the top of the reinforcing beam 3. The horizontal part 5 - 1, the vertical part 5 - 2, and the pressing part 5 - 3 form a "ji" - shaped structure.

[0030] The strap 5 is made of aluminum alloy material. In this embodiment, the strap 5 is formed from an aluminum alloy blank by using a stamping process or a molding process. The stamping process is suitable for mass production, with high efficiency and low cost; the molding process is more suitable for the forming of complex curved surfaces or thick - wall structures. The stamping process and the molding process adopt existing process methods and will not be described in detail here.

[0031] In this embodiment, the total width of the entire pressing strip 5 is 5 mm - 500 mm, the total height is 10 mm - 500 mm, the total width of the U-shaped structure formed by the horizontal part 5-1 and the vertical part 5-2 is 8 mm - 498 mm. An arc transition is adopted between the bottom ends of the horizontal part 5-1 and the vertical part 5-2, and an arc transition is adopted between the top end of the vertical part 5-2 and the pressing part 5-3. The curvature radius of the arc is 0.2 mm - 50 mm. The length of the pressing part is 2 mm - 450 mm, the thickness is 0.5 mm - 20 mm, and the thickness of the horizontal part is 0.5 mm - 20 mm, ensuring the connection strength between the horizontal part 5-1 and the reinforcing beam 3.

[0032] It can be understood that those skilled in the art can select the pressing strip 5 with corresponding dimensions according to the gap size between the battery packs corresponding to the battery cell assemblies 2, and no detailed description will be given here.

[0033] The pressing strip 5 adopts a "ji" - shaped structure, and the bottom of the pressing strip 5 is in contact with and fixedly connected to the top surface of the reinforcing beam 3. Compared with the traditional pressing strip, it can significantly improve the structural stiffness of the pressing strip itself, thereby effectively sharing the load of the reinforcing beam 3 inside the box body. The pressing force of the pressing part 5-3 on the battery cell assembly 2 can be transmitted to the reinforcing beam 3 inside the box body 1. The pressing strip 5, the battery cell assembly 2, and the reinforcing beam 3 inside the box body 1 are stressed together, improving the overall torsional stiffness of the battery pack. Under the dynamic conditions of the whole vehicle, this stress - sharing mechanism can effectively inhibit the distortion of the box body 1 and ensure the relative position stability between the battery cells. Moreover, the U-shaped structure formed by the horizontal part 5-1 and the vertical part 5-2 can inhibit the transmission of high-frequency vibration and improve the first-order modal frequency of the battery pack.

[0034] The U-shaped structure formed by the horizontal part 5-1 and the vertical part 5-2 can also absorb energy through plastic deformation during side collisions, while maintaining the binding force on the battery cell assembly 2, making the battery pack have better collision safety.

[0035] The horizontal part 5-1 is in contact with and fixed to the top surface of the reinforcing beam 3 inside the box body. In this embodiment, the horizontal part 5-1 is fixed to the top of the reinforcing beam 3 through multiple bolts. The multiple bolts are evenly distributed along the length direction of the horizontal part 5-1, and the adjacent bolts are spaced 10 mm - 500 mm apart. Those skilled in the art can set the spacing of the adjacent bolts according to the specifications of the battery pack, and no detailed description will be given here.

[0036] Since the horizontal part 5-1 is directly connected to the reinforcing beam 3, multiple bolts can be arranged along the length direction of the horizontal part 5-1. The pressing part 5-3 can generate a uniformly distributed pressing force on the battery cell assembly 2, reducing the pressure deviation on the top surface of the battery cell assembly 2 and avoiding the problem of edge stress concentration caused by the traditional pressing strip being fixed only through two ends.

[0037] Meanwhile, since the top surfaces of the horizontal section 5-1 and the reinforcing beam 3 are in direct contact, short bolts can be used to fix the horizontal section 5-1 and the reinforcing beam 3. Under vibration conditions, the bolts are not easy to loosen, ensuring the constraint force on the battery cells. This avoids the battery cells from being squeezed, rubbed, or impacted due to loss of constraint during vehicle acceleration, braking, turning, and especially collisions, which could lead to battery cell shell cracking, internal core deformation, separator puncture, and internal short circuits. This also avoids the problem of reduced overall battery pack structural rigidity, which would lead to changes in vibration modes, increased abnormal noise, and affect the overall NVH quality of the vehicle.

[0038] In this embodiment, since the horizontal part 5-1 is in contact with the top surface of the reinforcing beam 3, there are no bolts or other components in the space above the horizontal part 5-1. Therefore, this space can be used as a space to accommodate the wire harness 4. The wire harness 4 in the box 1 is located in the space above the horizontal part 5-1 and between the two vertical parts 5-2.

[0039] In this way, the wiring harness 4 does not need to be placed on the outside of the battery cell, which improves the space utilization of the housing 1 and reduces the volume of the entire battery pack. At the same time, the wiring harness 4 is wrapped in the space formed by the two vertical parts 5-2 of the pressure strip 5 and is located between two adjacent rows of battery cell assemblies 2, which also enhances its anti-interference ability and physical protection.

[0040] Furthermore, when bolts are used to fix the horizontal part 5-1 and the reinforcing beam 3, the horizontal part 5-1 is provided with a first fixing hole, and the reinforcing beam 3 is provided with a second fixing hole. The second fixing hole is a threaded hole, and the first fixing hole is a smooth hole or a threaded hole that matches the second fixing hole. After the bolt passes through the first fixing hole, it is threadedly connected to the reinforcing beam 3 through the second fixing hole, thereby achieving the fixation of the horizontal part 5-1 and the reinforcing beam 3.

[0041] When the first fixing hole is a threaded hole, the parameters and direction of rotation of the threaded hole of the first fixing hole are completely consistent with the parameters and direction of rotation of the second fixing hole, ensuring that the bolt can pass smoothly through the first fixing hole and the second fixing hole, and be threadedly connected to the horizontal part 5-1 and the reinforcing beam 3 through the first fixing hole and the second fixing through hole.

[0042] Since the location of the first fixing hole in the horizontal part 5-1 would weaken the structural strength, a local thickening is made at the location of the first fixing hole in the horizontal part 5-1. Specifically, a thickened boss is set at the location of the first fixing hole in the horizontal part 5-1. The coverage area of ​​the thickened boss can be set according to actual needs. The first fixing hole is opened on the thickened boss. By increasing the local thickness of the horizontal part 5-1 through the thickened boss, the structural strength of the horizontal part 5-1 at the location of the first fixing hole is ensured. At the same time, by setting the thickened boss, the horizontal part 5-1 can withstand the preload and working load of the bolt, avoid fatigue cracks caused by stress concentration, and ensure the service life of the pressure strip 5.

[0043] The thickness of the horizontal portion 5-1 at the thickened boss is increased to 18mm-22mm, preferably 20mm. It is understood that those skilled in the art can set the thickness of the horizontal portion at the thickened boss according to actual needs, and will not be described in detail here.

[0044] Furthermore, the horizontal part 5-1 is provided with a plurality of first mounting holes, and correspondingly, the top of the reinforcing beam 3 is provided with a second mounting hole that matches the first mounting holes. A wire harness clip 6 is installed at the first mounting hole and the second mounting hole. The wire harness clip 6 is connected to the wire harness 4 and is used to fix the wire harness 4.

[0045] The wire harness clip 6 can be made using existing technology. It includes a clip and part that is fixed to the reinforcing beam 3 and the horizontal part 5-1 through the first mounting hole and the second mounting hole, and a wire harness fixing part provided in the clip and part for the wire harness 4 to pass through. The existing structure can be used, and its specific structure will not be described in detail here.

[0046] By setting the wiring harness clip 6, the wiring harness of the battery pack can be arranged neatly, which facilitates later inspection and maintenance.

[0047] Furthermore, in order to better ensure the structural strength of the pressure strip 5, a plurality of reinforcing ribs are provided between the horizontal part 5-1 and the vertical part 5-2. The reinforcing ribs are rectangular, triangular or other shapes. Those skilled in the art can set them according to actual needs, and will not be described in detail here.

[0048] The reinforcing ribs can significantly improve the torsional and bending resistance of the pressure strip 5, and enhance the constraint ability of the pressure strip 5 on the battery cell assembly 2.

[0049] The surface of the pressure strip 5 is also coated with an anti-corrosion and insulating coating to enhance the anti-corrosion and insulation properties of the pressure strip 5, effectively prevent metal corrosion and electrical short circuits, and ensure the stability of the pressure strip during long-term use.

[0050] In this embodiment, the anti-corrosion insulating coating can be made of existing anti-corrosion insulating materials, such as epoxy resin or polyurethane. Those skilled in the art can select the type of anti-corrosion insulating coating according to actual needs, which will not be described in detail here.

[0051] In another embodiment, the surface of the pressure strip 5 is not coated with an anti-corrosion and insulating coating. Instead, the surface of the pressure strip is treated with electrophoresis to form an electrophoretic paint, thereby improving the anti-corrosion and insulating properties of the pressure strip. Existing technologies can be used for the electrophoretic treatment method, which will not be described in detail here. The electrophoretic paint has advantages such as uniform film thickness, strong adhesion, and excellent corrosion resistance, thus improving the reliability of the anti-corrosion and insulating properties of the pressure strip 5 surface.

[0052] The pressing part 5-3 is located above the edge of the top surface of the cell assembly 2. The pressing part 5-3 is in direct contact with the top surface of the cell assembly 2 and is used to apply a pressing force to the cell assembly 2.

[0053] Preferably, the contact surface of the pressing part 5-3 with the cell assembly 2 can be slightly roughened to increase the coefficient of friction and prevent slippage. For example, multiple grooves can be provided on the surface of the pressing part 5-3 that contacts the cell assembly 2 to form anti-slip texture, thereby increasing the friction between the pressing part 5-3 and the cell assembly 2.

[0054] In another embodiment, a plurality of protrusions arranged in an array can be provided on the surface of the pressing part 5-3 to increase the friction between the pressing part 5-3 and the battery cell assembly 2.

[0055] In this embodiment, during assembly, the pressure strip 5, consisting of a U-shaped structure formed by a horizontal part 5-1 and a vertical part 5-2, extends into the space between two adjacent rows of battery cell assemblies 2 until the horizontal part 5-1 contacts the top surface of the reinforcing beam 3 and the pressing part 5-3 is in contact with the edge of the top surface of the battery cell assembly 2.

[0056] During this process, the two vertical parts 5-2 cooperate with the side of the battery cell assembly 2 to play a guiding role, which can realize the rapid and accurate positioning of the pressure strip assembly, greatly improving the assembly efficiency and consistency.

[0057] Then move the pressure strip 5 so that the first fixing hole of the horizontal part 5-1 and the second fixing hole of the reinforcing beam 3 are aligned. Then screw the bolts into the first fixing hole and the second fixing hole, and the pressing part 5-3 presses and fixes the battery cell assembly 2.

[0058] Install the wiring harness clip 6 on the horizontal part 5-1 and the reinforcing beam 3, and then place the battery pack wiring harness into the space above the horizontal part 5-1 and between the two vertical parts 5-2 and connect it to the wiring harness clip 6.

[0059] The wire harness clip 6 makes the wire harness 4 more neat and standardized, which greatly facilitates later inspection and maintenance.

[0060] A ceramic fiber cloth 7 is laid on the surface of the battery cell assembly 2. The pressing part 5-3 is located between the ceramic fiber cloth 7 and the top surface of the battery cell assembly 2. The method of laying the ceramic fiber cloth 7 can be adopted using existing technology, and will not be described in detail here.

[0061] Ceramic fiber cloth 7 has excellent high temperature resistance, insulation and cushioning properties, which can delay the spread of fire in the early stage of thermal runaway and absorb some mechanical impact.

[0062] In this embodiment, only the structure of the pressure strip 5 and its connection with the reinforcing beam 3 are improved. The rest of the battery pack structure can use existing technology and will not be described in further detail here.

[0063] For the battery pack of this embodiment, the entire pressing strip 5 forms a "ji" - shaped structure. While improving the assembly efficiency of the pressing strip 5, it can significantly enhance the structural stiffness of the pressing strip itself, thereby effectively sharing the load of the reinforcing beam. At the same time, the "ji" - shaped structure of the pressing strip 5 can absorb energy through plastic deformation when subjected to side collisions, while maintaining the binding force on the battery cells, ensuring the multi - dimensional constraint ability of the pressing strip 5 on the battery cells. At the same time, the U - shaped structure formed by the horizontal part 5 - 1 and the vertical part 5 - 2 can suppress the transmission of high - frequency vibrations and increase the first - order modal frequency of the battery pack. The horizontal part 5 - 1 of the pressing strip 5 is in direct contact with and fixed to the top surface of the reinforcing beam 3. On the one hand, it can greatly shorten the rod length of the bolt. Under vibration conditions, the bolt is not easily loosened, ensuring the binding force on the battery cell assembly 2. On the other hand, a space for accommodating the wiring harness 4 can be formed between the two vertical parts 5 - 2. The wiring harness 4 does not need to be arranged outside the battery cell assembly 2, improving the space utilization rate of the box body 1, reducing the volume of the entire battery pack, and enhancing the adaptability of the battery pack to the installation space.

[0064] In this embodiment, only the pressing strip 5 is improved, and the remaining structures of the battery pack, such as the structure and layout position of the battery cell assembly 2 and the reinforcing beam 3, and the setting method of the wiring harness 4, are not changed. The improvement is convenient and the transformation cost is low.

[0065] Embodiment 2 This embodiment provides a battery pack. Compared with Embodiment 1, the top surface of the horizontal part 5 - 1 and the reinforcing beam 3 are connected by rivets. The horizontal part 5 - 1 and the reinforcing beam 3 are provided with fixing holes matching the rivets, and the horizontal part 5 - 1 has a thickening boss at the fixing holes. The remaining structures of this embodiment are the same as those of Embodiment 1 and will not be repeated here.

[0066] In this embodiment, the horizontal part 5 - 1 and the reinforcing beam 3 are fixed by rivets. There is no need for thread processing on the reinforcing beam 3 and the horizontal part 5 - 1, which is more convenient for processing. Moreover, the horizontal part 5 - 1 and the reinforcing beam 3 are riveted, the connection is more reliable, and the anti - vibration performance is better.

[0067] Embodiment 3 This embodiment provides a battery pack. Compared with Embodiment 1, the top surface between the horizontal part 5 - 1 and the reinforcing beam 3 is adhesively fixed by structural adhesive, and the horizontal part 5 - 1 does not have a thickening boss. The remaining structures of this embodiment are the same as those of Embodiment 1 and will not be repeated here.

[0068] Adopting the method of this embodiment, the horizontal part 5 - 1 does not have a thickening boss, simplifying the structure of the pressing strip 5, reducing the processing difficulty of the pressing strip 5. Moreover, when the horizontal part 5 - 1 and the reinforcing beam 3 are assembled, mechanical connectors such as bolts or rivets are omitted, further reducing the weight of the battery pack and simplifying the assembly process, and improving the assembly efficiency.

[0069] Since the horizontal part 5-1 and the top surface of the reinforcing beam 3 are directly attached, the horizontal part 5-1 and the reinforcing beam 3 can be fixed with rivets or structural adhesive instead of bolts. This allows for multiple ways to fix the pressure strip 5 to the reinforcing beam 3, and the optimal assembly method can be selected according to different vehicle models, thus improving the applicability of the processing technology when assembling the pressure strip 5.

[0070] Example 4 This embodiment provides a battery pack. Compared with Embodiment 1, the pressing part 5-3 does not directly contact the top surface of the cell assembly. A buffer pad is provided between the pressing part 5-3 and the top surface of the cell assembly 2. The buffer pad is made of a flexible material, such as a rubber pad or a silicone pad. Those skilled in the art can set it according to actual needs, and it will not be described in detail here. The buffer pad allows the cell assembly 2 and the pressing part 5-3 to flexibly fit together, avoiding damage to the surface of the cell assembly 2 caused by the pressing part 5-3. It is especially suitable for use with surface-sensitive soft-pack cells.

[0071] The remaining structure of this embodiment is the same as that of Embodiment 1, and will not be described again here.

[0072] Example 5 This embodiment provides a battery pack. Compared with embodiment 4, structural adhesive is provided between the pressing part 5-3 and the cell assembly 2. The pressing part 5-3 and the cell assembly 2 are bonded and fixed by structural adhesive, which further enhances the constraint force and improves the overall rigidity. The rest of the structure of this embodiment is the same as that of embodiment 4, and will not be described in detail here.

[0073] Example 6 This embodiment provides a car, which is an electric vehicle, equipped with the battery pack described in Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, or Embodiment 5. The remaining structure of the car can adopt existing technology and will not be described in detail here.

[0074] The vehicle of this embodiment, by using the battery pack of embodiment 1, 2, 3, 4, or 5, significantly improves the safety of the entire vehicle and has broad market application prospects.

[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, comprising a housing, wherein a wiring harness and multiple rows of battery cell assemblies are disposed inside the housing, a reinforcing beam fixed to the housing is provided at the bottom of the space between adjacent rows of battery cell assemblies, and a pressure strip is provided between the top surfaces of adjacent rows of battery cell assemblies, characterized in that, The pressure strip includes a horizontal part, with vertical parts extending upward at both ends of the horizontal part to form a U-shaped structure. The horizontal part contacts and is fixedly connected to the top surface of the reinforcing beam. The space between the two vertical parts accommodates the wire harness. At least one vertical part has a flange at its top to form a pressing part, which covers the edge of the top surface of the battery cell assembly.

2. The battery pack as described in claim 1, characterized in that, The horizontal section is fixed to the top surface of the reinforcing beam by bolts, rivets, or structural adhesive.

3. The battery pack as described in claim 1, characterized in that, The horizontal section is fixed to the top surface of the reinforcing beam by bolts or rivets. The horizontal section is provided with fixing holes that match the bolts or rivets. The thickness of the horizontal section at the fixing holes is greater than the thickness of the rest of the horizontal section.

4. The battery pack as described in claim 3, characterized in that, The thickness of the horizontal portion at the fixing hole is 18mm-22mm, preferably 20mm.

5. The battery pack as described in claim 1, characterized in that, The pressing part is in direct contact with the top surface of the battery cell assembly; or; A buffer pad is provided between the pressing part and the top surface of the battery cell assembly; or; Structural adhesive is provided between the pressing part and the top surface of the battery cell assembly.

6. The battery pack as described in claim 1, characterized in that, The pressure strip is made of aluminum alloy or fiber composite material.

7. The battery pack as described in claim 1, characterized in that, The surface of the pressure strip is coated with an anti-corrosion and insulating coating.

8. The battery pack as claimed in claim 1, characterized in that, The horizontal section is equipped with multiple wire harness clips, through which the wire harness passes and is secured.

9. The battery pack as claimed in claim 1, characterized in that, Multiple reinforcing ribs are provided between the vertical and horizontal sections.

10. A car, characterized in that, The battery pack is provided according to any one of claims 1-9.

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