Battery module, battery pack, and vehicle

Abstract

This application discloses a battery module, a battery pack, and a vehicle. The battery module includes multiple battery cells, two end plates, a side plate assembly, an integrated busbar, a top stamped cold plate, and a bottom stamped cold plate. The side plate assembly includes two side plates, both ends of which are fixedly connected to the corresponding end plates along their length. The top stamped cold plate has a top cold plate lug at its end in the stacking direction of the battery cells, and the top cold plate lug is detachably connected to the end plates. The bottom stamped cold plate is connected to the side plates. The top stamped cold plate is bonded to the integrated busbar via a thermally conductive adhesive pad, and the bottom stamped cold plate is bonded to the bottom of the battery cells via a thermally conductive structural adhesive. The end plates and side plates form an integral frame to compensate for the insufficient rigidity of the stamped cold plates. The detachable connection between the top cold plate lug and the end plates, and the connection between the bottom stamped cold plate and the side plates, achieve precise positioning of the cold plates. The bonding of the thermally conductive adhesive pad and the thermally conductive structural adhesive achieves heat dissipation and prevents misalignment, thereby improving the vibration and impact resistance of the battery module and extending its service life.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery module, a battery pack, and a vehicle. Background Technology

[0002] In the field of power battery modules, the top and bottom double-layer liquid cooling structure is widely used in rigid-shell cell modules due to its high heat dissipation efficiency. However, in related technologies, unreasonable connection methods between the top and bottom cold plates and the module can easily lead to problems such as cold plate misalignment, flow channel misalignment, and even failure of the connection between the cell and the integrated busbar when the battery pack is vibrated or impacted. This can affect the heat dissipation stability and structural stability, and reduce the service life of the module. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a battery module, a battery pack, and a vehicle that can improve the vibration and shock resistance of the battery module, and enhance the stability and service life of the battery module.

[0004] In a first aspect, this application provides a battery module, which includes multiple battery cells, two end plates, a side plate assembly, an integrated busbar, a top stamped cold plate, and a bottom stamped cold plate; Multiple battery cells are stacked sequentially along their thickness direction and clamped together by two end plates; The side plate assembly includes two side plates, which are respectively disposed on both sides of the width direction of the multiple cells and extend along the stacking direction of the multiple cells. Both ends of the side plates in the length direction are fixedly connected to the corresponding end plates. The integrated busbar is connected to the terminals of multiple battery cells; Both the top and bottom stamped cold plates have integrated liquid cooling channels. The top stamped cold plate has a top cold plate lug at the end of the cell stacking direction. The top cold plate lug is detachably connected to the end plate. The bottom stamped cold plate is connected to the side plate. The top stamped cold plate is bonded to the integrated busbar via a thermally conductive adhesive pad, while the bottom stamped cold plate is bonded to the bottom of the battery cell via a thermally conductive structural adhesive.

[0005] According to the battery module of this application, the insufficient rigidity of the stamped cold plate is compensated by the integral frame formed by the end plate and the side plate. The cold plate is accurately positioned by the detachable connection between the top cold plate hanging ear and the end plate and the connection between the bottom stamped cold plate and the side plate. The bonding of thermally conductive pads and thermally conductive structural adhesive achieves the dual effects of heat dissipation and anti-misalignment. Ultimately, the vibration and impact resistance of the battery module is improved, the risk of cold plate displacement, flow channel misalignment and failure of cell and integrated busbar connection is reduced, the service life of the module is extended, and the advantages of low cost, easy molding and strong adaptability of stamped cold plate are retained.

[0006] According to one embodiment of this application, the side plate assembly further includes at least one intermediate side plate, the plurality of cells include multiple rows distributed along their width direction, the intermediate side plate is disposed between two adjacent rows of cells and extends along the stacking direction of the cells, the longitudinal end of the intermediate side plate is fixedly connected to the end plate, and both the side plate and the intermediate side plate are bonded to the side of the adjacent cells.

[0007] According to one embodiment of this application, the end of the side plate in the longitudinal direction is bent toward the end plate to form a side bend, and the side bend is welded to the end plate. The end plate is provided with a slot, and the end of the middle side plate passes through the slot and is welded to the end plate; The bottom of the side plate is provided with a folded edge, and the folded edge is provided with a connecting hole. The folded edge is fixedly connected to the bottom stamped cold plate on the side in the width direction of the cell through the connecting hole.

[0008] Secondly, this application provides a battery pack comprising: At least one battery module as described in any of the technical solutions in the first aspect; The housing includes multiple longitudinal beams extending along the stacking direction of the battery cells and multiple transverse beams extending along the width direction of the battery cells. The multiple longitudinal beams are spaced apart along the width direction of the battery cells, and the multiple transverse beams are spaced apart along the stacking direction of the battery cells. The multiple longitudinal beams and multiple transverse beams are connected in an alternating manner. The battery module is installed in the installation space enclosed by two adjacent longitudinal beams and two adjacent transverse beams. The two end plates of the battery module are detachably connected to the adjacent transverse beams, and the connection positions of the two end plates to the corresponding transverse beams are the same as the spacing between the adjacent longitudinal beams.

[0009] According to the battery pack of this application, the symmetrical connection position combined with the frame-type box structure can significantly reduce the excitation difference at both ends of the battery module, reduce the risk of module torsion, cell misalignment and stamping cold plate displacement. Combined with the anti-vibration structure of the battery module itself, it further improves the overall vibration and impact resistance of the battery pack, ensures the structural stability and operational reliability of the battery module under complex working conditions, and extends the overall service life of the battery pack. At the same time, the improved box structure also provides comprehensive and reliable external protection for the battery module.

[0010] According to one embodiment of this application, the battery pack includes multiple battery modules, which are arranged along the stacking direction of the cells. The housing includes at least three crossbeams, with a battery module provided between every two adjacent crossbeams. The at least three crossbeams include two side crossbeams spaced apart along the cell stacking direction, and at least one intermediate crossbeam disposed between the two side crossbeams. The side crossbeams and the intermediate crossbeams have the same height, and the width of the intermediate crossbeam is twice the width of the side crossbeams in the cell stacking direction.

[0011] According to one embodiment of this application, a support member is provided between the side plate of the battery module and the longitudinal beam. The two sides of the support member in the thickness direction abut against the side plate and the longitudinal beam respectively to constrain the deformation of the middle position of the side plate.

[0012] According to one embodiment of this application, the housing is provided with a plurality of mounting holes for connection with the vehicle body. The plurality of mounting holes are arranged at intervals along the stacking direction of the battery cells. In the stacking direction of the battery cells, at least a portion of the plurality of mounting holes are provided in correspondence with the crossbeams. The mounting holes corresponding to the crossbeams are located at the centerline of the crossbeams along their width direction.

[0013] According to one embodiment of this application, the dynamic response excitation amplification factor from the mounting hole corresponding to the crossbeam to the acceleration response point of the battery module near the mounting hole is ≤5. The dynamic response excitation amplification factor is the ratio of the response acceleration of the battery module at the acceleration response point near the mounting hole to the fixed-frequency input acceleration of the corresponding mounting hole.

[0014] According to one embodiment of this application, the acceleration response points of the battery module include a first end acceleration response point, a middle acceleration response point, and a second end acceleration response point that are spaced apart along the stacking direction of the battery cells. The difference in response acceleration between the first end acceleration response point, the middle acceleration response point, and the second end acceleration response point is ≤30%, and the difference in vibration phase angle between the first end acceleration response point, the middle acceleration response point, and the second end acceleration response point is ≤10%.

[0015] Thirdly, this application also provides a vehicle that includes a battery pack as described in any of the technical solutions in the second aspect, the battery pack being used to provide electrical energy to the vehicle.

[0016] The beneficial effects of the vehicle provided in the third aspect of this application are the same as those of the battery pack provided in the second aspect, and will not be repeated here.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is an exploded structural diagram of the battery module provided in the embodiments of this application; Figure 2 This is a partial structural schematic diagram of the battery module provided in the embodiments of this application; Figure 3 This is a schematic diagram of a partial explosion structure of a battery provided in an embodiment of this application; Figure 4 This is a partial side view of the battery structure provided in an embodiment of this application; Figure 5 This is a schematic diagram of the excitation transmission path from battery pack mounting to module response point in the embodiments of this application; Figure 6 This is a deformation response diagram of the battery module in the embodiment of this application at the vibration mode resonance point inside the box.

[0019] Figure label: 1000. Battery pack; 100. Battery module; 101. Cell; 1. Cell stack; 2. First end plate; 3. Second end plate; 4. Side plate; 5. Middle side plate; 6. Bottom stamped cold plate; 7. Top stamped cold plate; 8. Integrated busbar; 9. Structural adhesive; 10. Top cold plate mounting lug; 11. Thermally conductive structural adhesive; 12. Thermally conductive silicone pad; 13. Connection hole; 14. Side crossbeam; 15. Middle crossbeam; 16. First mounting hole; 17. Second mounting hole; 18. Third mounting hole; 20. Mounting hole; 21. Foam; 141. Side crossbeam mounting hole; 151. Middle crossbeam mounting hole; 102. Terminal post; 301. First end acceleration response point; 302. Second end acceleration response point; 303. Middle acceleration response point; 401. EPDM foam; 402. Support component. Detailed Implementation

[0020] In the field of power battery modules, the top and bottom double-layer liquid cooling structure is widely used in rigid-shell cell modules due to its high heat dissipation efficiency. However, in related technologies, unreasonable connection methods between the top and bottom cold plates and the module can easily lead to problems such as cold plate misalignment, flow channel misalignment, and even failure of the connection between the cell and the integrated busbar when the battery pack is vibrated or impacted. This can affect the heat dissipation stability and structural stability, and reduce the service life of the module.

[0021] Specifically, the traditional bottom cooling module is to bond the bottom of the aluminum shell of the battery cell to the cold plate, and weld the battery cell terminal to the high-voltage aluminum busbar to realize the series and parallel connection of adjacent battery cells. The aluminum busbar is made of 1060-O state and has a groove in the middle bend to absorb the flatness and vibration in the height direction. In the horizontal direction, since the difference in horizontal sway between adjacent battery cells is small, the resulting tensile force is within the range that the aluminum busbar can bear.

[0022] When a top liquid cooler is added to the module to form a double-layer liquid cooler, the top cold plate is bonded to all aluminum busbars as a whole. The horizontal traction range expands from adjacent cells to all cells in the entire module, and increases with the length of the module. This creates internal stress along the entire force transmission path, causing failure at the weakest point (the welded area on the side of the cell top cover). In addition to vibration disturbance causing misalignment between module cells, excitation differences at the module mounting points can also cause misalignment of the cells at both ends of the module along their length. These failures mainly occur in long modules with a length L≥1m. When long modules vibrate, their own disturbance is large, and the excitation displacement and phase difference of the end plates on both sides are even greater.

[0023] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0024] The following is for reference. Figures 1-6 This application describes a battery module and a battery pack according to embodiments thereof.

[0025] Please see Figure 1 and Figure 2 This application provides a battery module 100, which includes multiple battery cells 101, two end plates, a side plate assembly, an integrated busbar 8, a top stamped cold plate 7, and a bottom stamped cold plate 6.

[0026] Multiple battery cells 101 are stacked sequentially along their thickness direction and clamped by two end plates; the side plate assembly includes two side plates 4, which are respectively located on both sides of the width direction of the multiple battery cells 101 and extend along the stacking direction of the multiple battery cells 101. Both ends of the side plates 4 in the length direction are fixedly connected to the corresponding end plates; the integrated busbar 8 is connected to the pole posts 102 of the multiple battery cells 101; liquid cooling channels are integrated in the top stamped cold plate 7 and the bottom stamped cold plate 6. The top stamped cold plate 7 has a top cold plate lug 10 at the end of the battery cell 101 in the stacking direction. The top cold plate lug 10 is detachably connected to the end plate. The bottom stamped cold plate 6 is connected to the side plates 4; the top stamped cold plate 7 is bonded to the integrated busbar 8 by a thermally conductive adhesive pad, and the bottom stamped cold plate 6 is bonded to the bottom of the battery cell 101 by a thermally conductive structural adhesive 11.

[0027] First, it should be noted that in related technologies, the commonly used cold plates for liquid cooling modules are mainly divided into stamped cold plates and extruded cold plates. Each has its advantages and disadvantages and is applicable to different scenarios: Extruded cold plates are usually formed by processing solid profiles, which have high structural strength and rigidity and are not easily deformed or misaligned under vibration and impact conditions. However, their processing technology is complex and difficult to form, especially for large-size and irregularly shaped flow channels, and the material utilization rate is low and the production cost is high, making it difficult to meet the design requirements of lightweight, low-cost and diversified power battery modules. On the other hand, stamped cold plates form internal flow channels by stamping sheet metal. Their processing technology is simple and the forming efficiency is high. They can flexibly adapt to module designs of different sizes and flow channel layouts. The material utilization rate is high and the production cost is lower, which is more in line with the development trend of large-scale production and lightweighting of power battery modules. However, their wall thickness is relatively thin and their rigidity is relatively weak. When subjected to vibration or impact, they are more prone to displacement, warping and flow channel misalignment, which will affect the cooling effect and structural reliability. This embodiment is based on the advantages of stamped cold plates, while specifically addressing their inherent defects. It features a specially designed overall structure for the battery module 100 and the assembly and fixing methods for the stamped cold plates.

[0028] The battery cell 101 can be a square-shell battery cell 101. Multiple battery cells 101 are stacked sequentially along their own thickness direction to form a battery cell stack 1. Adjacent battery cells 101 can be bonded and fixed together by structural adhesive 9. The two end plates can be a first end plate 2 and a second end plate 3, respectively. The first end plate 2 and the second end plate 3 are respectively set at both ends of the battery cell stack 1 along the stacking direction. The two end plates cooperate with each other to clamp and fix the battery cell stack 1, so that the battery cells 101 maintain a stable relative position and avoid relative displacement under vibration or impact conditions. At the same time, it provides basic installation support for the entire module.

[0029] The side plate assembly includes two side plates 4, which are located on both sides of the cell stack 1 in the width direction and extend along the stacking direction of the cells 101. The two ends of the side plates 4 in the length direction are fixedly connected to the first end plate 2 and the second end plate 3, respectively. This connection method makes the end plates, side plates 4 and the cell stack 1 form a closed and stable integral frame structure, which can not only provide all-round constraint on the cell stack 1, but also provide a reliable installation foundation for the top stamped cold plate 7 and the bottom stamped cold plate 6, effectively make up for the problem of insufficient rigidity of the stamped cold plate, limit the warping and movement of the cold plate, and prevent the cold plate from shifting due to insufficient rigidity.

[0030] The integrated busbar 8 is located above the cell stack 1 and is connected to the terminal post 102 of each cell 101 to realize the series or parallel connection between the cells 101, complete the collection and transmission of electrical energy, and ensure the stability of the module's power output.

[0031] The top stamped cold plate 7 and the bottom stamped cold plate 6 are located at the upper and lower parts of the battery module 100, respectively. Both of them have integrated liquid cooling channels. The cooling medium can circulate inside the liquid cooling channels and efficiently remove the heat generated by the cell 101 during operation through heat exchange, thereby achieving bidirectional heat dissipation of the module and ensuring the stable operating temperature of the cell 101.

[0032] The top stamped cold plate 7 has a top cold plate lug 10 at its end near the stacking direction of the battery cell 101. The top cold plate lug 10 is detachably connected to the end plate. This connection method utilizes the high strength of the end plate to precisely position and constrain the end of the stamped cold plate, limiting its movement in the stacking and width directions and preventing misalignment of the flow channel due to cold plate displacement. Furthermore, it facilitates the disassembly, maintenance, and replacement of the stamped cold plate, taking advantage of its ease of forming and mass production. In some examples, the top cold plate lug 10 can be connected to the end plate via bolts.

[0033] The top stamped cold plate 7 is bonded to the integrated busbar 8 via a thermally conductive adhesive pad. This pad not only has excellent thermal conductivity, efficiently transferring heat generated by the integrated busbar 8 and the battery cell 101 terminals 102 to the top stamped cold plate 7 for rapid heat dissipation, but also possesses excellent ductility. When the battery module 100 is subjected to vibration or impact, it can deform to absorb some of the misalignment between the battery cells 101, preventing the misalignment from being transferred to the connection between the integrated busbar 8 and the terminals 102, thus reducing the risk of connection failure. Simultaneously, it accommodates slight warping deformation of the stamped cold plate, ensuring a tight fit between the top cold plate and the integrated busbar 8, preventing poor adhesion from affecting heat dissipation. The thermally conductive adhesive pad can be a thermally conductive silicone pad 12.

[0034] The bottom stamped cold plate 6 is directly connected to the side plate 4, so that the bottom stamped cold plate 6 and the side plate assembly form a stable assembly relationship, further improving the positional stability of the stamped cold plate in the vibration environment, ensuring the fit between the bottom cold plate and the bottom of the battery cell 101, and ensuring heat dissipation efficiency.

[0035] The bottom stamped cold plate 6 is bonded to the bottom of the battery cell 101 by thermally conductive structural adhesive 11. The thermally conductive structural adhesive 11 has strong bonding strength, which can realize a large-area reliable connection between the bottom stamped cold plate 6 and the bottom of the battery cell 101, further limiting the positional displacement of the bottom stamped cold plate 6. At the same time, its good thermal conductivity can improve the heat transfer efficiency between the bottom of the battery cell 101 and the cold plate, making the battery cell 101 more uniformly heated and avoiding local overheating that could affect the lifespan of the battery cell 101.

[0036] In actual implementation, the integral frame structure effectively constrains the cell stack 1 and the cold plate. The detachable connection between the top cold plate lug 10 and the end plate, and the connection between the bottom cold plate and the side plate 4, together solve the defects of insufficient rigidity and easy displacement of the stamped cold plate. The bonding method of the thermally conductive pad and the thermally conductive structural adhesive 11 not only ensures heat dissipation efficiency, but also absorbs the misalignment of the cell 101 through the extensibility of the thermally conductive pad, reducing the risk of connection failure.

[0037] According to the battery module 100 provided in the embodiments of this application, the insufficient rigidity of the stamped cold plate is compensated by the overall frame formed by the end plate and the side plate 4. The cold plate is accurately positioned by the detachable connection between the top cold plate hanging ear 10 and the end plate and the connection between the bottom cold plate and the side plate 4. The bonding of the thermally conductive pad and the thermally conductive structural adhesive 11 achieves the dual effects of heat dissipation and anti-misalignment. Ultimately, the vibration resistance and impact resistance of the battery module 100 are improved, the risk of cold plate displacement, flow channel misalignment and connection failure between the cell 101 and the integrated busbar 8 is reduced, the service life of the module is extended, and the advantages of low cost, easy molding and strong adaptability of stamped cold plate are retained.

[0038] Please see Figure 1 According to some embodiments of this application, the side plate assembly may further include at least one intermediate side plate 5, and the plurality of battery cells 101 include multiple rows distributed along their width direction. The intermediate side plate 5 is disposed between two adjacent rows of battery cells 101 and extends along the stacking direction of the battery cells 101. The longitudinal end of the intermediate side plate 5 is fixedly connected to the end plate, and both the side plate 4 and the intermediate side plate 5 are bonded to the side of the adjacent battery cell 101.

[0039] When there are a large number of battery cells 101 and they are arranged in multiple rows along the width direction, the side plate assembly includes not only two side plates 4, but also at least one middle side plate 5.

[0040] The number of intermediate side plates 5 can be set according to the number of columns of battery cells 101, for example, one, two or more can be set to adapt to the stacking layout requirements of battery cells 101 of different specifications. The intermediate side plates 5 are set between two adjacent columns of battery cells 101 and extend along the stacking direction of battery cells 101. The ends of the intermediate side plates 5 in the length direction are fixedly connected to the end plates, so that the intermediate side plates 5, the side plates 4 and the end plates together form a multi-segment constraint frame, which further improves the overall structural rigidity of the battery module 100.

[0041] Both the side plate 4 and the middle side plate 5 are bonded to the side of the adjacent battery cell 101. The bonding method can be to use insulating adhesive to form a stable overall connection between the side plate and the battery cell 101, and to prevent relative sliding between the battery cell 101 and the side plate.

[0042] The middle side plate 5 can independently constrain the multiple rows of cells 101, restricting the movement and displacement of the cells 101 in the width direction. Under vibration or impact conditions, it reduces the mutual influence between the multiple rows of cells 101, further reducing the possibility of cell 101 misalignment. At the same time, in conjunction with the heat dissipation and positioning structure of the top stamped cold plate 7 and the bottom stamped cold plate 6, it further improves the structural stability and heat dissipation uniformity of the battery module 100.

[0043] Please see Figure 1 According to some embodiments of this application, the end of the side plate 4 in the length direction is bent towards the end plate to form a side bend, and the side bend is welded to the end plate.

[0044] The side plate 4 is bent at its long end toward the side closest to the end plate to form a side bend. The side bend increases the contact area between the side plate 4 and the end plate, making the connection between the two more stable and reliable. The side bend is fixed to the welding boss reserved on the end plate by welding. The connection formed by welding has high strength and can effectively withstand the load caused by vibration and impact, preventing the side plate 4 from loosening or separating from the end plate, and further strengthening the structural strength of the overall frame.

[0045] Please see Figure 1 According to some embodiments of this application, the end plate may be provided with a slot, and the end of the middle side plate 5 passes through the slot and is welded to the end plate.

[0046] The end plate is provided with a slot. The end of the middle side plate 5 passes through the slot and is then welded to the end plate. The slot can position and limit the end of the middle side plate 5, reducing the positioning difficulty of the middle side plate 5 during assembly. At the same time, it restricts the movement of the middle side plate 5 in the width and thickness directions of the cell 101. The welding method after passing through the slot further ensures the connection strength between the middle side plate 5 and the end plate, so that the middle side plate 5 can stably separate and constrain the multiple rows of cells 101, improving the overall regularity and stability of the cell stack 1.

[0047] Please see Figure 1 According to some embodiments of this application, the bottom of the side plate 4 may be provided with a folded edge, and the folded edge is provided with a connecting hole 13. The folded edge is fixedly connected to the bottom stamped cold plate 6 on the side in the width direction of the cell 101 through the connecting hole 13.

[0048] The bottom of the side plate 4 is provided with a folded edge, which extends along the length of the side plate 4. A connecting hole 13 is provided on the folded edge. The bottom stamped cold plate 6 is fixedly connected to the folded edge on the side of the cell 101 in the width direction through the connecting hole 13. This connection method can be bolt connection, screw connection, or riveting connection. The folded edge increases the connection area between the side plate 4 and the bottom stamped cold plate 6, so that the side of the bottom stamped cold plate 6 can also be effectively fixed, further limiting the warping and displacement of the bottom stamped cold plate 6 under vibration conditions. At the same time, it makes the bottom stamped cold plate 6 and the side plate 4 form an integrated assembly structure, further compensating for the problem of insufficient rigidity of the stamped cold plate itself, and ensuring stable contact and efficient heat dissipation between the bottom stamped cold plate 6 and the bottom of the cell 101.

[0049] Both the bottom stamped cold plate 6 and the top stamped cold plate 7 are mechanically connected to the assembled battery cell 101 module through assembly holes, avoiding the displacement of the cold plate flow channel and the reduction of cooling effect caused by the lack of mechanical assembly.

[0050] In some embodiments, in the multi-row battery cells 101, each row of battery cells 101 is stacked sequentially along its own thickness direction. A U-shaped rubber pad and aerogel are attached between the large surfaces of two adjacent battery cells 101. The U-shaped rubber pad can buffer the vibration impact between battery cells 101, reduce frictional damage between the large surfaces of battery cells 101, and help fix the relative position of battery cells 101. The aerogel has both heat insulation and buffering functions, which can reduce heat transfer between battery cells 101, avoid local overheating, and further absorb the deformation caused by vibration. Together with the thermally conductive rubber pad, it can improve the vibration and buffering effect of the module. PC insulating sheets and MPP foam 21 are attached to the two outer sides of each row of battery cells 101 in the width direction. The PC insulating sheet plays an insulating and protective role, preventing short circuits between battery cells 101 and side plates 4 and middle side plates 5. MPP foam 21 further enhances the buffering effect, reduces the impact of vibration on the sides of battery cells 101, and fills the small gaps between battery cells 101 and side plates, improving the fit.

[0051] In some embodiments, the integrated busbar 8 adopts a high-voltage integrated structure, internally including a high-voltage connection section and a low-voltage and temperature signal sampling section. The high-voltage connection section is used to realize series or parallel connection between battery cells 101, and the low-voltage and temperature signal sampling section is used to collect the voltage and temperature signals of each battery cell 101 in real time, facilitating timely monitoring of the working status of the battery cell 101 and ensuring the safe use of the battery module 100. The high-voltage aluminum busbar in the integrated busbar 8 is fixedly connected to the terminal post 102 of the battery cell 101 by laser welding, resulting in high connection strength and stable conductivity. The positive and negative terminals of the high-voltage aluminum busbar are connected to the output terminals of the module, respectively, to achieve stable power output. All high-voltage aluminum busbars have the same thickness, and the upper surface of the aluminum busbar is higher than the top of the integrated busbar 8, which can avoid interference between components, facilitate assembly and subsequent maintenance, and further improve the reliability of the high-voltage connection. The top surface of the high-voltage aluminum busbar is connected to the top stamped cold plate 7 through a thermally conductive rubber pad.

[0052] Please see Figure 1 , Figure 3 and Figure 4 , Figure 4 The X-axis represents the stacking direction of cell 101, and the Z-axis represents the height direction of cell 101.

[0053] Based on the same considerations, this application also provides a battery pack 1000.

[0054] The battery pack 1000 includes at least one battery module 100 and a housing based on the above-described technical solutions.

[0055] It should be noted that since the battery pack 1000 provided in this application embodiment includes the battery module 100 of any of the above technical solutions, it has the technical features and technical effects of the battery module 100 of any of the above technical solutions, which will not be elaborated here.

[0056] The number of battery modules 100 can be set according to the overall capacity requirements of the battery pack 1000. For example, one, two or more can be set, and there is no specific limit here.

[0057] The housing includes multiple longitudinal beams extending along the stacking direction of the battery cells 101 and multiple transverse beams extending along the width direction of the battery cells 101. The multiple longitudinal beams are spaced apart along the width direction of the battery cells 101, and the multiple transverse beams are spaced apart along the stacking direction of the battery cells 101. The multiple longitudinal beams and multiple transverse beams are connected in an alternating manner. The battery module 100 is disposed in the installation space enclosed by two adjacent longitudinal beams and two adjacent transverse beams. The two end plates of the battery module 100 are detachably connected to the two adjacent transverse beams, and the connection positions of the two end plates and the corresponding transverse beams are the same as the spacing between the adjacent longitudinal beams.

[0058] The enclosure adopts a frame structure, including longitudinal and transverse beams, a bottom plate, and a cover plate. The bottom plate is located at the bottom of the enclosure, and the cover plate is located at the top. The bottom plate and cover plate are fixedly connected to the longitudinal and transverse beams, respectively, forming a closed enclosure space that provides dustproof, waterproof, and mechanical protection for the internal battery module 100, ensuring the overall structural integrity of the battery pack 1000. Foam 21 can be installed between the battery module 100 and the bottom and cover plates to support the battery module 100 and provide cushioning.

[0059] The longitudinal beams extend along the stacking direction of the battery cells 101, and multiple longitudinal beams are arranged at intervals along the width direction of the battery cells 101; the cross beams extend along the width direction of the battery cells 101, and multiple cross beams are arranged at intervals along the stacking direction of the battery cells 101. The longitudinal beams and cross beams are intersected and fixedly connected to form a stable frame body. The frame body is subjected to uniform force, which can effectively transmit and disperse external excitation and improve the overall rigidity of the battery pack 1000.

[0060] Two adjacent longitudinal beams and two adjacent transverse beams enclose each other to form an installation space. The battery module 100 is arranged within this installation space, which provides circumferential restraint to the battery module 100, limiting its movement within the housing. It can be understood that with two longitudinal beams, they can serve as the outer frame beams of the housing. With three or more longitudinal beams, the central longitudinal beam can also serve as the internal intermediate longitudinal beam, determined by the internal structural layout of the housing. The same applies to the transverse beams, which will not be elaborated upon here.

[0061] The two end plates of the battery module 100 are detachably connected to the adjacent crossbeams. This detachable connection can be achieved using bolts, screws, or other methods, facilitating the assembly, disassembly, and maintenance of the battery module 100. It should be noted that the end plates of the battery module 100 can be directly connected to the crossbeams or to a support structure on the crossbeams facing inwards towards the inside of the housing.

[0062] The connection points between the two end plates and the crossbeams are kept at the same distance as the adjacent longitudinal beams. In related technologies, the connection points between the two ends of the battery module and the housing are often asymmetrical or inconsistent in distance from the housing beams. When the battery pack is subjected to vibration or impact, the external excitation received by the two end plates differs significantly, easily leading to uneven stress on both ends of the module and relative torsional deformation. This further exacerbates the stress damage at the connection between the cell and the integrated busbar, and also increases the risk of displacement and misalignment of the stamped cold plate. This solution sets the connection points of the two end plates to be the same as the distance between the adjacent longitudinal beams, making the support structure at both ends of the battery module symmetrical. The path and amplitude of the external excitation transmitted from the housing to the two end plates tend to be consistent, effectively reducing the excitation difference between the two end plates and avoiding torsion and misalignment of the module due to uneven stress on both ends, thus improving the stress environment of the module from the source.

[0063] by Figure 3 and Figure 4 For example, in the figure, the first end plate 2 of the battery module 100 is directly opposite the side crossbeam 14, and the second end plate 3 is directly opposite the middle crossbeam 15. The first end plate 2 is connected to the side crossbeam 14 through the side crossbeam mounting hole 141, and the second end plate 3 is connected to the middle crossbeam 15 through the middle crossbeam mounting hole 151. The distance between the side crossbeam mounting hole 141 and the longitudinal beam, and the distance between the middle crossbeam mounting hole 151 and the longitudinal beam are the same.

[0064] According to the battery pack 1000 provided in the embodiments of this application, the symmetrical connection positions combined with the frame-type box structure can significantly reduce the excitation difference at both ends of the battery module 100, reduce the risk of module torsion, cell misalignment, and stamping cold plate displacement. Combined with the anti-vibration structure of the battery module 100 itself, the overall vibration and impact resistance of the battery pack 1000 is further improved, ensuring the structural stability and operational reliability of the battery module 100 under complex working conditions, extending the overall service life of the battery pack 1000. At the same time, the improved box structure also provides comprehensive and reliable external protection for the battery module 100.

[0065] Please see Figure 3 and Figure 4 According to some embodiments of this application, the battery pack 1000 may include a plurality of battery modules 100, which are arranged along the stacking direction of the cells 101. The housing includes at least three crossbeams, with a battery module 100 disposed between every two adjacent crossbeams. The at least three crossbeams include two side crossbeams 14 spaced apart along the stacking direction of the cells 101, and at least one intermediate crossbeam 15 disposed between the two side crossbeams 14. The side crossbeams 14 and the intermediate crossbeams 15 have the same height, and the width of the intermediate crossbeam 15 is twice the width of the side crossbeams 14 in the stacking direction of the cells 101.

[0066] Multiple battery modules 100 can be installed inside the battery pack 1000. The multiple battery modules 100 are arranged sequentially along the stacking direction of the cells 101. The number of crossbeams of the box is at least three. A space is formed between two adjacent crossbeams to accommodate a single battery module 100. A battery module 100 is provided between every two adjacent crossbeams, so that each battery module 100 is arranged in an orderly manner in the box along the stacking direction of the cells 101, thereby realizing a reasonable expansion of the capacity of the battery pack 1000.

[0067] The at least three crossbeams of the housing are of two types: two side crossbeams 14 and at least one middle crossbeam 15. The two side crossbeams 14 are distributed at intervals along the stacking direction of the battery cells 101 in the outer area of ​​the housing, and the middle crossbeam 15 is disposed between the two side crossbeams 14 to separate adjacent battery modules 100.

[0068] The number of intermediate crossbeams 15 can be set according to the number of battery modules 100. For example, one, two or more can be set to adapt to the arrangement requirements of different numbers of battery modules 100.

[0069] The side beams 14 and the middle beams 15 are at the same height to ensure the flatness of the top and bottom of the box, which facilitates the assembly of the bottom plate, cover plate and other accessories, and makes the overall force of the box more even.

[0070] In the stacking direction of the battery cells 101, the width of the middle crossbeam 15 is set to twice the width of the side crossbeams 14, so that the middle crossbeam 15 has higher structural strength and rigidity. As a shared load-bearing structure that separates adjacent battery modules 100, the middle crossbeam 15 needs to bear the force transmitted by the battery modules 100 on both sides at the same time. Increasing its width can effectively improve the load-bearing capacity and deformation resistance of the middle crossbeam 15, avoid bending or deformation of the middle crossbeam 15 due to large force, and ensure the positioning accuracy and installation stability of each battery module 100 in the box.

[0071] By setting up the above-mentioned crossbeam structure, multiple battery modules 100 can be arranged in a symmetrical and stable manner within the housing, further reducing the difference in excitation at both ends of each battery module 100, further reducing the risk of torsion or misalignment of the battery modules 100, improving the overall structural rigidity and vibration and impact resistance of the battery pack 1000, and ensuring the consistency and reliability of the working state of multiple battery modules 100.

[0072] Please see Figure 3 According to some embodiments of this application, a support member 402 is provided between the side plate 4 of the battery module 100 and the longitudinal beam. The two sides of the support member 402 in the thickness direction abut against the side plate 4 and the longitudinal beam respectively to constrain the deformation of the middle position of the side plate 4.

[0073] The battery module 100 uses a stamped cold plate, which has relatively weak rigidity. The side plate 4, as an important part of the module frame, extends along the stacking direction of the cells 101 and has a long length. When subjected to vibration or impact, the middle area of ​​the side plate 4 is most prone to bending, warping and other deformations because it is far away from the end plates at both ends. This causes the bottom stamped cold plate 6 to shift and the cell stack 1 to misalign, affecting the stability of the module structure.

[0074] The support member 402 is disposed between the side plate 4 and the longitudinal beam, and is located in the middle region of the side plate 4. One side of the support member 402 in the thickness direction abuts against the middle of the side plate 4, and the other side abuts against the longitudinal beam, thereby providing support and limiting the middle position of the side plate 4, restricting the bending and warping deformation of the middle part of the side plate 4, keeping the side plate 4 in a straight state as a whole, and ensuring its constraint effect on the battery cell stack 1. Specifically, the two ends of the support member 402 in the length direction are located between the two end plates.

[0075] The support component 402 can be made of various structural components with certain rigidity and buffering performance, such as rigid foam, rubber sheet, plastic support block, or lightweight composite material plate. It can provide reliable support rigidity and absorb some impact energy during vibration, avoiding damage to the side plate 4 or longitudinal beam caused by rigid support. In some examples, the support component 402 can be foam, and the filling area is controlled by EPDM foam 401 to ensure that the foam covers all the cells 101 of the battery module 100. Specifically, the distance between the top of the foam and the weld between the top cover of the cell and the side of the bottom plate is 10-20mm, the height of the foam is greater than or equal to 70mm, the elastic modulus of the foam is 80-100MPa, and the adhesive shear and peel strength is greater than or equal to 1MPa. When disassembling the module, a special adhesive remover can be used to dissolve the foam, allowing the module to be disassembled without damage.

[0076] The support component 402 achieves constraint through abutment, simplifying assembly and eliminating the need for complex fixing methods such as welding or bonding. It also adapts to minor gap changes between the side plate 4 and the longitudinal beam, ensuring continuous and stable support. Effective constraint on the deformation of the middle part of the side plate 4 further reduces the relative misalignment between the cells 101, lowering the risk of displacement of the bottom stamped cold plate 6 due to side plate deformation. Combined with the symmetrical connection structure at both ends of the module, this makes the stress on the entire battery module 100 more uniform, further improving the vibration and impact resistance of the battery pack 1000 and ensuring the structural stability and heat dissipation reliability of the battery module 100 under complex working conditions.

[0077] Please see Figure 3 and Figure 4 According to some embodiments of this application, the housing is provided with a plurality of mounting holes 20 for connecting to the vehicle body. The plurality of mounting holes 20 are arranged at intervals along the stacking direction of the battery cells 101. In the stacking direction of the battery cells 101, at least some of the plurality of mounting holes 20 are provided in correspondence with the crossbeams, and the mounting holes 20 corresponding to the crossbeams are located at the centerline of the crossbeams along their own width direction.

[0078] The mounting hole 20 is a key structure for connecting the battery pack 1000 to the vehicle body. It is used to fix the battery pack 1000 on the vehicle body. Its setting position directly affects the stress state and vibration resistance of the battery pack 1000. In related technologies, the mounting hole 20 often has problems such as uneven distribution and mismatch with the position of the box beam. This results in the excitation transmitted by the vehicle body not being evenly distributed, which easily causes stress concentration in local areas of the battery pack, thereby aggravating the deformation and damage inside the module.

[0079] The enclosure is provided with multiple mounting holes 20. The number of mounting holes 20 is not specifically limited and can be flexibly set according to the size and weight of the battery pack 1000 and the vehicle body installation requirements. The multiple mounting holes 20 are evenly spaced along the stacking direction of the battery cells 101, so that the connection points between the battery pack 1000 and the vehicle body are evenly distributed along the stacking direction, ensuring that the battery pack 1000 is subjected to balanced force as a whole and avoiding excessive local force that could cause the enclosure to deform.

[0080] In the stacking direction of the battery cells 101, at least some of the mounting holes 20 form a one-to-one positional relationship with the crossbeam (the mounting holes 20 and the crossbeam are not corresponding in the figure, and the figure is only one example of this application). That is, these mounting holes 20 are in the same position as the crossbeam in the stacking direction. The vibration or impact excitation generated by the vehicle body can be directly transmitted to the crossbeam with higher stiffness through the mounting holes 20, and then evenly transmitted from the crossbeam to the longitudinal beam and the battery module 100, avoiding the excitation from acting directly on the weak area of ​​the box and reducing the risk of local deformation of the box.

[0081] To facilitate understanding of the solution, such as Figure 4 As shown, by way of example, the plurality of mounting holes 20 may include a first mounting hole 16, a second mounting hole 17 and a third mounting hole 18. The first mounting hole 16 corresponds to one of the side crossbeams 14, the third mounting hole 18 corresponds to the middle crossbeam 15 adjacent to the side crossbeam 14 corresponding to the first mounting hole 16, and the second mounting hole 17 is located at the middle position between the first mounting hole 16 and the third mounting hole 18.

[0082] This corresponding arrangement enables a shorter and more direct excitation transmission path. Combined with the high structural stiffness of the crossbeam itself, it effectively disperses external excitation, reduces the imbalance in excitation transmission, and further reduces the torsion and misalignment tendencies at both ends of the battery module 100 caused by excitation differences. It also works synergistically with the aforementioned symmetrical connection of the end plates and the constraint of the side plate deformation by the support member 402, thereby improving the overall vibration and impact resistance of the battery pack 1000.

[0083] The mounting holes 20 corresponding to the crossbeam are all arranged at the centerline of the crossbeam along its own width direction, that is, at the centerline of the crossbeam in the stacking direction of the battery cells 101. This arrangement can ensure that the external excitation is transmitted symmetrically along the width direction of the crossbeam, so that the force on both sides of the crossbeam is consistent, and avoid the crossbeam from bending or deflecting due to excessive force on one side. At the same time, it ensures that the path and magnitude of the excitation transmitted to both ends of the battery module 100 are consistent, further reducing the excitation difference between the two ends of the module, and reducing the possibility of torsional deformation of the module from the source.

[0084] Please see Figure 4 According to some embodiments of this application, the dynamic response excitation amplification factor of the mounting hole 20 corresponding to the crossbeam to the acceleration response point of the battery module 100 near the mounting hole 20 is ≤5; wherein, the dynamic response excitation amplification factor is the ratio of the response acceleration of the acceleration response point of the battery module 100 near the mounting hole 20 to the fixed frequency input acceleration of the corresponding mounting hole 20.

[0085] The excitation transmission effect between the mounting hole 20 and the battery module 100 is quantitatively limited. By controlling the range of the dynamic response excitation amplification factor, the vibration and impact resistance of the battery pack 1000 is guaranteed from a quantitative perspective, preventing external excitation from being amplified after transmission and causing damage to the internal structure of the battery module 100. The mounting hole 20 corresponds one-to-one with the crossbeam and is located at the centerline of the crossbeam's width direction to optimize the excitation transmission path and reduce the excitation difference between the two ends of the module. By limiting the dynamic response excitation amplification factor, it is further ensured that this optimized design can achieve the expected effect and realize the controllability of excitation transmission.

[0086] The dynamic response excitation amplification factor is the ratio of the response acceleration at the acceleration response point of the battery module 100 near the corresponding mounting hole 20 to the fixed-frequency input acceleration of the mounting hole 20. Simply put, it is the amplification factor of the acceleration after the external excitation is transmitted from the mounting hole 20 to the end of the battery module 100.

[0087] The fixed-frequency input acceleration is the external excitation acceleration transmitted from the vehicle body to the battery pack 1000 through the mounting hole 20, while the response acceleration is the actual acceleration experienced by the module after the excitation is transmitted to the acceleration response point at the end of the battery module 100. The ratio of the two directly reflects the degree of amplification during the excitation transmission process. The smaller the ratio, the smaller the amplification during the excitation transmission process, and the smaller the excitation impact experienced by the module. If the ratio is too large, the excitation will be significantly amplified, and the force on the end of the module will increase sharply, which can easily lead to problems such as cell 101 misalignment, stamping cold plate displacement, and connection failure between the integrated busbar 8 and the terminal post 102.

[0088] The dynamic response excitation amplification factor of the mounting hole 20 corresponding to the crossbeam to the acceleration response point of the battery module 100 near the mounting hole 20 is ≤5. This limit is a reasonable range obtained through multiple tests. Figure 5 As shown, Figure 5 The diagram illustrates the transmission path from the excitation at mounting hole 20 to the acceleration response point, as well as the factors affecting the excitation along this path, including but not limited to the distance from mounting hole 20 to the crossbeam mounting hole, the width of the crossbeam, the height of the crossbeam, the cross-sectional shape of the crossbeam, and the distance from the crossbeam to the module. Adjusting these parameters regulates the dynamic response excitation amplification factor. A dynamic response excitation amplification factor ≤ 5 ensures that the excitation experienced by the module is within acceptable limits during normal vehicle operation (including bumpy conditions, rapid acceleration, and rapid deceleration), while avoiding excessive structural complexity and increased costs due to an excessively low factor setting. It should be noted that the acceleration response point is the critical stress point on the end of the battery module 100 closest to the corresponding mounting hole 20. Its position corresponds to the mounting hole 20 in the stacking direction of the cell 101, ensuring accurate acquisition of the actual response acceleration experienced by the module end and guaranteeing the accuracy of the factor calculation.

[0089] This application achieves effective control of the excitation amplification factor through multiple structural combinations: First, the mounting holes 20 correspond one-to-one with the crossbeams in the stacking direction of the battery cells 101 and are located at the centerline of the crossbeam width direction, so that the external excitation is transmitted along the center of the beam with the highest stiffness, avoiding additional bending moment and local amplification due to eccentric force; Second, the connection positions of the end plates at both ends of the battery module 100 and the longitudinal beams are symmetrical and the spacing with the adjacent crossbeams is the same, ensuring that the path length and stiffness distribution of the excitation transmitted to both ends of the module are consistent, reducing excitation amplification caused by asymmetrical transmission paths; Third, the support member 402 set between the side plate 4 and the longitudinal beam can effectively constrain the deformation of the middle part of the side plate, improve the overall stiffness of the module, and reduce the resonance amplification trend during vibration; Finally, the thermally conductive pads, U-shaped rubber pads, and other buffer structures used inside the battery module 100 can absorb part of the excitation energy in the transmission path, further weakening the acceleration amplification amplitude.

[0090] The above structure works together from multiple angles, including centering the transmission path, symmetrical force distribution, improved overall stiffness, and buffering energy absorption, to prevent excessive amplification when the external excitation input from the mounting hole 20 is transmitted to the acceleration response point at the end of the battery module 100. This keeps the dynamic response excitation amplification factor stable within 5, ensuring that the battery module 100 will not suffer structural damage due to amplified excitation under vehicle vibration and impact conditions.

[0091] Please see Figure 1 and Figure 4For ease of understanding, in the stacking direction of the battery cells 101, the battery module 100 has a first end near the first end plate 2 and a second end near the second end plate 3. The first end is near the first mounting hole 16 and the second end is near the third mounting hole 18. The dynamic response excitation amplification factor from the first mounting hole 16 to the first end acceleration response point 301 of the battery module 100 is ≤5, and the dynamic response excitation amplification factor from the third mounting hole 18 to the second end acceleration response point 302 of the battery module 100 is ≤5.

[0092] Please see Figure 4 and Figure 6 , Figure 6 The X-axis direction is the stacking direction of the battery cells 101, and the Y-axis direction is the width direction of the battery cells 101. According to some embodiments of this application, the acceleration response points of the battery module 100 include a first end acceleration response point 301, a middle acceleration response point 303, and a second end acceleration response point 302, which are spaced apart along the stacking direction of the battery cells 101. The difference in response acceleration between the first end acceleration response point 301, the middle acceleration response point 303, and the second end acceleration response point 302 is ≤30%, and the vibration phase angle difference between the first end acceleration response point 301, the middle acceleration response point 303, and the second end acceleration response point 302 is ≤10%.

[0093] This embodiment further limits the consistency of dynamic response at different positions on the battery module 100. By controlling the acceleration difference and phase angle difference, it ensures that the module is subjected to uniform force, thereby fundamentally reducing the torsional deformation and relative misalignment of the cell stack 1.

[0094] Multiple acceleration response points are spaced apart on the battery module 100 along the stacking direction of the cells 101. Specifically, they include a first end acceleration response point 301, a middle acceleration response point 303, and a second end acceleration response point 302. The first end acceleration response point 301 and the second end acceleration response point 302 are located at the two ends of the battery module 100 along the stacking direction, respectively. The middle acceleration response point 303 is located in the middle area of ​​the battery module 100 along the stacking direction. The three response points can comprehensively reflect the vibration response state of different areas of the module.

[0095] Under vibration excitation, the difference in response acceleration between the first end acceleration response point 301, the middle acceleration response point 303, and the second end acceleration response point 302 does not exceed 30%, and the vibration phase angle difference does not exceed 10%. The small difference in response acceleration indicates that the vibration intensity at both ends and the middle of the battery module 100 is similar, preventing excessive acceleration and severe stress in localized areas, thus avoiding significant relative displacement between the cells 101 due to localized acceleration differences. The small vibration phase angle difference indicates that the vibration pace of each part of the module is basically consistent, preventing phase deformation such as one end vibrating first and the other later, or one end vibrating upwards and the other downwards. This significantly reduces the tendency for the battery module 100 to undergo overall torsional deformation, reduces warping and displacement of the stamped cold plate due to torsional deformation, and protects the connection between the integrated busbar 8 and the terminal post 102 of the cell 101 from tearing or loosening.

[0096] This application, through the aforementioned structural design of the alignment of the box beam and mounting hole 20, the symmetrical connection at both ends of the module, and the constraint of the middle support member 402 of the side plate 4, ensures that external excitation is uniformly transmitted and distributed on the battery module 100, naturally achieving the effect of acceleration difference ≤30% and vibration phase angle difference ≤10% at the three positions. This design further ensures the overall coordinated deformation capability of the battery module 100 under vehicle vibration conditions, improves structural stability and vibration resistance reliability, reduces the risks of cell misalignment, cold plate movement, electrical connection failure, etc., and extends the overall service life of the battery pack 1000.

[0097] Based on the same considerations, this application also provides a vehicle.

[0098] The vehicle includes a battery pack 1000 based on any of the above-mentioned technical solutions, and the battery pack 1000 is used to provide electrical energy to the vehicle.

[0099] It should be noted that since the vehicle provided in this application embodiment includes the battery pack 1000 of any of the above technical solutions, it has the technical features and technical effects of the battery pack 1000 of any of the above technical solutions, which will not be repeated here.

[0100] The vehicle is a new energy vehicle, which may include pure electric vehicles, plug-in hybrid electric vehicles, etc. Its core power source is the battery pack 1000. As the core energy storage and power supply component of the vehicle, the battery pack 1000 is used to provide stable power to all electrical equipment such as the vehicle's drive motor, vehicle control system, air conditioning, and headlights, and directly determines the vehicle's range, power performance and driving stability.

[0101] The new energy vehicle also includes conventional structures such as body, drive motor, chassis, control system, and charging system. The chassis is equipped with an installation structure that is compatible with the mounting hole 20 of the battery pack 1000. The battery pack 1000 is fixedly connected to the chassis through the mounting hole 20, adapting to various working conditions during vehicle operation.

[0102] Because the battery pack 1000 in this embodiment has undergone multiple structural optimizations, it has excellent vibration and impact resistance capabilities, and can effectively resist vibration excitation generated during vehicle operation (such as bumpy roads, rapid acceleration, rapid deceleration, turning, etc.), avoiding problems such as misalignment of the battery cells 101 inside the battery pack 1000, displacement of the stamping cold plate, and failure of electrical connections, thereby ensuring the stability of the vehicle's power output.

[0103] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0104] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0105] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0106] In the description of this application, "multiple" means two or more.

[0107] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0108] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0110] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery module, characterized in that, Includes multiple battery cells, two end plates, side plate assemblies, integrated busbars, top stamped cold plate, and bottom stamped cold plate; Multiple said cells are stacked sequentially along their thickness direction and clamped by the two said end plates; The side plate assembly includes two side plates, which are respectively disposed on both sides of the width direction of the plurality of battery cells and extend along the stacking direction of the plurality of battery cells. Both ends of the side plates in the length direction are fixedly connected to the corresponding end plates. The integrated busbar is connected to the terminals of the multiple battery cells; Both the top stamped cold plate and the bottom stamped cold plate have integrated liquid cooling channels. The top stamped cold plate has a top cold plate lug at its end in the stacking direction of the battery cell. The top cold plate lug is detachably connected to the end plate. The bottom stamped cold plate is connected to the side plate. The top stamped cold plate is bonded to the integrated busbar via a thermally conductive adhesive pad, and the bottom stamped cold plate is bonded to the bottom of the battery cell via a thermally conductive structural adhesive.

2. The battery module according to claim 1, characterized in that, The side plate assembly further includes at least one intermediate side plate, and the plurality of battery cells include multiple rows distributed along their width direction. The intermediate side plate is disposed between two adjacent rows of battery cells and extends along the stacking direction of the battery cells. The longitudinal end of the intermediate side plate is fixedly connected to the end plate. Both the side plate and the intermediate side plate are bonded to the side of the adjacent battery cell.

3. The battery module according to claim 2, characterized in that, The side plate is bent at its longitudinal end toward the end plate to form a side bend, and the side bend is welded to the end plate. The end plate is provided with a slot, and the end of the middle side plate passes through the slot and is welded to the end plate; The bottom of the side plate is provided with a folded edge, and the folded edge is provided with a connecting hole. The folded edge is fixedly connected to the bottom stamped cold plate on the side in the width direction of the cell through the connecting hole.

4. A battery pack, characterized in that, include: At least one battery module as described in any one of claims 1-3; The housing includes a plurality of longitudinal beams extending along the stacking direction of the battery cells and a plurality of transverse beams extending along the width direction of the battery cells. The plurality of longitudinal beams are spaced apart along the width direction of the battery cells, and the plurality of transverse beams are spaced apart along the stacking direction of the battery cells. The plurality of longitudinal beams and the plurality of transverse beams are connected in an alternating manner. The battery module is disposed within the installation space formed by two adjacent longitudinal beams and two adjacent transverse beams. The two end plates of the battery module are detachably connected to the adjacent transverse beams, and the connection positions of the two end plates to the corresponding transverse beams are the same as the distance between the two end plates and the adjacent longitudinal beams.

5. The battery pack according to claim 4, characterized in that, The battery pack includes multiple battery modules, which are arranged along the stacking direction of the cells. The housing includes at least three crossbeams, with one battery module between every two adjacent crossbeams. The at least three beams include two side beams spaced apart along the cell stacking direction, and at least one intermediate beam disposed between the two side beams. The side beams and the intermediate beams have the same height, and the width of the intermediate beam is twice the width of the side beams in the cell stacking direction.

6. The battery pack according to claim 4, characterized in that, A support member is provided between the side plate of the battery module and the longitudinal beam. The two sides of the support member in the thickness direction abut against the side plate and the longitudinal beam respectively to constrain the deformation of the middle position of the side plate.

7. The battery pack according to claim 4, characterized in that, The housing is provided with a plurality of mounting holes for connection with the vehicle body. The plurality of mounting holes are arranged at intervals along the stacking direction of the battery cells. In the stacking direction of the battery cells, at least a portion of the plurality of mounting holes are provided in a one-to-one correspondence with the crossbeam. The mounting hole corresponding to the crossbeam is located at the centerline of the crossbeam along its own width direction.

8. The battery pack according to claim 7, characterized in that, The dynamic response excitation amplification factor of the mounting hole corresponding to the crossbeam to the acceleration response point of the battery module near the mounting hole is ≤5. Wherein, the dynamic response excitation amplification factor is the ratio of the response acceleration of the acceleration response point of the battery module near the mounting hole to the fixed-frequency input acceleration corresponding to the mounting hole.

9. The battery pack according to claim 8, characterized in that, The acceleration response points of the battery module include a first end acceleration response point, a middle acceleration response point, and a second end acceleration response point, which are spaced apart along the stacking direction of the battery cells. The difference in response acceleration between the first end acceleration response point, the middle acceleration response point, and the second end acceleration response point is ≤30%, and the difference in vibration phase angle between the first end acceleration response point, the middle acceleration response point, and the second end acceleration response point is ≤10%.

10. A vehicle, characterized in that, Includes a battery pack as described in any one of claims 4-9, the battery pack being used to provide electrical energy to the vehicle.

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