Bottom protection structure for battery pack and battery pack

Abstract

The invention relates to the technical field of battery packs, and discloses a bottom protection structure for a battery pack and the battery pack, the bottom protection structure for the battery pack comprises a liquid cooling plate, a bottom protection plate and a buffer layer; the bottom of the liquid cooling plate comprises a non-flow channel area and a protruding flow channel area; the bottom protection plate is arranged at the bottom of the liquid cooling plate, and the bottom protection plate and the liquid cooling plate are arranged at intervals; the buffer layer is arranged between the liquid cooling plate and the bottom protection plate, and the bottom of the buffer layer abuts against the bottom protection plate; in the flow channel area, the top of the buffer layer abuts against the liquid cooling plate; according to the present invention, the impact force can be effectively absorbed and dispersed when the different regions of the battery pack are impacted so as to ensure that the battery cells in the battery pack are not extruded when the battery pack is subjected to the external force effect, such that the battery pack can be prevented from being damaged, and the battery pack is prevented from being damaged. And the protection level of the battery cells in the battery pack is improved, and the overall safety of the battery pack is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a bottom protection structure for a battery pack and a battery pack. Background Art

[0002] As environmental awareness continues to increase worldwide, the market demand for new energy vehicles has shown an upward trend year by year. However, in the context of this booming development, the safety of new energy vehicle battery packs has always been a major challenge restricting the development of the industry. During vehicle driving, the battery pack is susceptible to a variety of external factors such as road bumps and foreign objects on the road surface, and may encounter bottom bumps. Such bumps may not only cause damage to the battery pack structure, but also pose a risk of causing serious safety accidents such as fires, posing a threat to the overall safety of the vehicle and the safety of life and property of passengers. Summary of the invention

[0003] In view of this, the present invention provides a bottom protection structure for a battery pack and a battery pack to solve or improve the problem that the battery pack is easily affected by various external factors such as road bumps and foreign objects on the road surface, and may then encounter bottom bumps, causing damage to the battery pack structure.

[0004] In a first aspect, the present invention provides a bottom protection structure for a battery pack, comprising a liquid cooling plate, a bottom protective plate and a buffer layer; the bottom of the liquid cooling plate comprises a non-flow channel area and a protruding flow channel area; the bottom protective plate is arranged at the bottom of the liquid cooling plate and is spaced apart from the liquid cooling plate; the buffer layer is arranged between the liquid cooling plate and the bottom protective plate, and the bottom of the buffer layer abuts against the bottom protective plate; in the flow channel area, the top of the buffer layer abuts against the liquid cooling plate; in the non-flow channel area, the top of the buffer layer is spaced apart from the liquid cooling plate and forms a spacing area.

[0005] Beneficial effects: by arranging a bottom guard plate at the bottom of the liquid cooling plate, when the battery pack is subjected to external impact, the bottom guard plate at the bottom of the battery pack is first contacted, and the bottom guard plate deforms and absorbs the impact energy at the same time; by arranging a buffer layer between the bottom guard plate and the liquid cooling plate, when the impact point is in the non-flow channel area, the bottom guard plate deforms to absorb energy and contacts the buffer layer, the buffer layer is squeezed, and further absorbs the impact energy through its own extrusion, collapse and bending deformation, and because in the non-flow channel area, the buffer layer and the liquid cooling plate are spaced apart and form a spacing area, it is ensured that the buffer layer will not touch the liquid cooling plate during the deformation process, thereby preventing the extrusion of the liquid cooling plate, and further reducing the impact energy transmitted to the battery cell; when the impact point is in the flow channel area, the bottom guard plate and the buffer layer are deformed synchronously, the buffer layer collapses and absorbs energy, and the flow channel area absorbs energy by deformation, ensuring that the deformation of the buffer layer will not touch the battery cell above the liquid cooling plate, effectively preventing direct extrusion of the battery cell, thereby reducing the impact energy borne by the battery cell. The present invention realizes that when different areas of a battery pack are impacted, impact force can be effectively absorbed and dispersed, thereby ensuring that when the battery pack is subjected to external force, the battery cells inside the battery pack are not squeezed, thereby improving the level of protection for the battery cells inside the battery pack and ensuring the overall safety of the battery pack.

[0006] In an optional embodiment, a protruding structure is provided on a side of the buffer layer facing the liquid cooling plate, and the protruding structure is arranged in the spacing area and spaced apart from the bottom of the liquid cooling plate.

[0007] Beneficial effects: By setting the raised structure, the overall strength of the buffer layer can be increased, so that it can better maintain structural integrity when subjected to external impact, thereby more effectively absorbing and dispersing energy; and the raised structure can also change the energy absorption path of the buffer layer when subjected to impact, so that the energy is more evenly distributed in the buffer layer, avoiding damage to the buffer layer caused by excessive local energy.

[0008] In an optional embodiment, the distance between the top of the protruding structure and the bottom of the liquid cooling plate is greater than or equal to 1 mm.

[0009] Beneficial effect: By setting the distance between the top of the raised structure and the bottom of the liquid cooling plate to be greater than or equal to 1 mm, it is ensured that there is a sufficient distance interval between the raised structure and the liquid cooling plate, providing the necessary deformation space for the raised structure, so that when the battery pack faces external impact, it can effectively prevent direct hard collision between the buffer layer and the liquid cooling plate, significantly enhancing the impact resistance and stability of the overall structure of the battery pack.

[0010] In an optional embodiment, the width of the protruding structure is greater than or equal to 2.5 mm.

[0011] Beneficial effect: By setting the width of the raised structure to be greater than or equal to 2.5 mm, the surface area of ​​the buffer layer can be increased to a certain extent, thereby providing more energy absorption area. When the buffer layer is impacted, the raised structure can more effectively absorb and disperse the impact energy, thereby improving the overall energy absorption efficiency.

[0012] In an optional embodiment, at least one through hole is provided in the buffer layer.

[0013] Beneficial effects: Through the design of the through holes, the buffer layer can absorb and disperse the impact energy through the deformation of the through holes and the compression characteristics of the buffer layer itself when impacted, thereby effectively reducing the impact force and protecting the impacted area; the design of the through holes not only promotes the uniform distribution of the impact force inside the buffer layer, preventing cracks or failures caused by local stress concentration, but also achieves lightweighting while ensuring the original performance of the buffer layer, reducing the weight of the overall structure; and by flexibly adjusting the size, number and distribution of the through holes, the performance of the buffer layer can be finely optimized without relying on more expensive materials or complex processes, thereby achieving the dual goals of meeting performance requirements and controlling production costs.

[0014] In an optional embodiment, the through hole is a circular hole, and the diameter of the circular hole is less than 25 mm.

[0015] Beneficial effects: Since the processing process of the circular hole is more stable and controllable, the scrap rate and production cost are effectively reduced; by setting the diameter of the circular hole to less than 25mm, the impact force can be dispersed in a smaller area, so that the buffer layer can absorb energy more evenly when impacted, thereby improving the overall impact resistance; the design of the circular hole and the reasonable aperture can not only enhance the structural strength of the buffer layer, but also make the buffer layer more stable when subjected to external force, less prone to deformation or failure, and can reduce the defects and stress concentration points inside the buffer layer, thereby improving the overall stability and durability of the buffer layer, and effectively absorbing energy.

[0016] In an optional embodiment, the through hole is a parallelogram hole, and the height of the parallelogram hole is less than 25 mm.

[0017] Beneficial effects: The design of the parallelogram hole is relatively simple, easy to process and manufacture, which can reduce production costs and improve production efficiency. The hole height less than 25mm can ensure that the material has better flexibility and deformation ability while maintaining sufficient strength, thereby more effectively absorbing impact energy.

[0018] In an optional embodiment, the through hole is a triangular hole, and the diameter of the inscribed circle of the triangular hole is less than 25 mm.

[0019] Beneficial effects: Since the triangle has a stable structural characteristic, when the buffer layer is impacted, the triangular hole design can more effectively disperse and absorb the impact force; the restriction that the inscribed circle diameter is less than 25mm ensures that the size of the through hole is moderate, which can effectively absorb energy without weakening the overall strength of the buffer layer due to the through hole being too large, and also ensures the feasibility and economy of processing.

[0020] In an optional embodiment, the buffer layer has a thickness ranging from 2.5 to 17 mm.

[0021] Beneficial effects: The buffer layer with a thickness of nearly 17 mm usually has a higher energy absorption capacity and better buffering effect, and is suitable for occasions that need to withstand greater impact forces; while the buffer layer with a thickness of nearly 2.5 mm may provide a certain amount of energy absorption protection while maintaining lightness, and is suitable for occasions with strict requirements on weight and thickness; therefore, the thickness range of the buffer layer is set between 2.5 and 17 mm, and the most appropriate buffer layer thickness can be selected according to specific application requirements and cost budget to achieve a balance between performance and cost; and because the processing and manufacturing process of the buffer layer needs to take the material thickness factor into account, within this thickness range, it can be easier to perform processing operations such as cutting, bending, and forming, thereby achieving comprehensive optimization of performance, cost and processing efficiency.

[0022] In an optional embodiment, the flow channel area is provided in plurality, and the plurality of flow channel areas are arranged in parallel.

[0023] Beneficial effect: By setting multiple flow channel areas in parallel, even if a local flow channel area is subjected to external extrusion or deformation, the coolant can still flow normally in the remaining parallel flow channel areas, thereby avoiding the overall thermal management efficiency degradation caused by local blockage, ensuring that the thermal management efficiency of the entire liquid cooling plate can be maintained at a stable and efficient level, and can significantly improve its ability to resist external impact risks and the stability of the overall structure while ensuring the heat dissipation capacity of the liquid cooling plate.

[0024] In an optional embodiment, a plurality of convex ribs are provided on a side of the bottom guard plate facing the buffer layer, the plurality of convex ribs are arranged in sequence and spaced apart, and the convex ribs abut against the bottom of the buffer layer.

[0025] Beneficial effect: By setting convex ribs on the bottom guard plate, the local stiffness of the bottom guard plate is improved, thereby enhancing the overall stiffness of the bottom guard plate. While ensuring that the basic strength of the guard plate is effectively guaranteed, its energy absorption capacity can be further improved. It not only optimizes the mechanical properties of the bottom guard plate, enabling it to better disperse stress and reduce deformation when subjected to external impact, but also improves the overall safety and stability of the battery pack.

[0026] In an optional embodiment, the height of the rib ranges from 1.7 to 5 mm.

[0027] Beneficial effect: By setting the height range of the ribs between 1.7 and 5 mm, not only the local and overall stiffness of the bottom guard plate is enhanced, so that it can better maintain structural stability and reduce deformation when facing external impact or vibration, but also the unnecessary increase in the thickness of the battery pack due to the addition of the ribs is avoided. It not only optimizes the mechanical properties of the bottom guard plate, but also significantly improves the space utilization and overall compactness of the battery pack, achieving dual optimization of the bottom guard plate structural stiffness and battery pack thickness control.

[0028] In an optional embodiment, the thickness of the bottom guard plate ranges from 0.7 to 1.2 mm.

[0029] Beneficial effect: By setting the thickness of the bottom guard plate between 0.7 and 1.2 mm, the lightweight design goal of the bottom guard plate is achieved while ensuring that the bottom guard plate provides sufficient protection for the battery pack; compared with the unreasonable design of too large or too small thickness, the 0.7-1.2 mm bottom guard plate not only significantly reduces material consumption and processing difficulty, but also improves production efficiency and product yield, and effectively controls production costs while ensuring high-quality product output, and has higher economic benefits.

[0030] In an optional embodiment, the bottom guard plate is a steel guard plate.

[0031] Beneficial effects: Since the steel guard plate has good impact resistance and rigidity, it can deform and absorb energy when impacted, thereby protecting the battery cells inside the battery pack. It not only improves the overall impact resistance and structural stability of the battery pack, but also extends the service life of the battery cells.

[0032] In a second aspect, the present invention further provides a battery pack, comprising the above-mentioned bottom protection structure for the battery pack.

[0033] Because the battery pack includes a bottom protection structure for the battery pack, which has the same effect as the bottom protection structure for the battery pack, it is not repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1It is a schematic structural diagram of a bottom protection structure for a battery pack according to an embodiment of the present invention;

[0036] Figure 2 Another structural schematic diagram of a bottom protection structure for a battery pack according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic structural diagram of a buffer layer provided with a protruding structure according to an embodiment of the present invention;

[0038] Figure 4 It is a structural schematic diagram of a buffer layer provided with through holes according to an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1. Liquid cooling plate; 11. Non-flow channel area; 12. Flow channel area; 13. Flow channel plate; 14. Top plate; 2. Bottom guard plate; 21. Raised ribs; 3. Buffer layer; 31. Raised structure; 32. Through hole; 4. Spacer area. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0042] In the related art, a support rib is provided on the side of the buffer layer 3 away from the bottom guard plate 2. The support rib protrudes upward and is used to contact the non-flow channel area 11, and the flow channel area 12 is arranged at an interval without contact with the buffer layer 3; since the support rib is in direct contact with the non-flow channel area 11, when the bottom guard plate 2 of the battery pack is squeezed or hit by an external force, the external force can be transmitted to the non-flow channel area 11 through the buffer layer 3 and the support rib, so that the bottom guard plate 2 will not touch the flow channel area 12 when it is deformed, so as to prevent the bottom guard plate 2 from deforming and squeezing the flow channel area 12. However, since the liquid cooling plate 1 is in direct contact with the battery cell in the non-flow channel area 11, and there is no buffer area between the two, when the buffer layer 3 and the support rib transmit the external force to the non-flow channel area 11, the liquid cooling plate 1 in the non-flow channel area 11 is deformed and directly squeezes the battery cell, causing damage to the battery cell.

[0043] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0044] According to an embodiment of the present invention, on the one hand, a bottom protection structure for a battery pack is provided, comprising a liquid cooling plate 1, a bottom protective plate 2 and a buffer layer 3; the bottom of the liquid cooling plate 1 comprises a non-flow channel area 11 and a protruding flow channel area 12; the bottom protective plate 2 is arranged at the bottom of the liquid cooling plate 1, and is spaced apart from the liquid cooling plate 1; the buffer layer 3 is arranged between the liquid cooling plate 1 and the bottom protective plate 2, and the bottom of the buffer layer 3 abuts against the bottom protective plate 2; in the flow channel area 12, the top of the buffer layer 3 abuts against the liquid cooling plate 1; in the non-flow channel area 11, the top of the buffer layer 3 is spaced apart from the liquid cooling plate 1 and forms a spacer area 4.

[0045] By setting a bottom guard plate 2 at the bottom of the liquid cooling plate 1, when the battery pack is subjected to external impact, the bottom guard plate 2 at the bottom of the battery pack is first contacted, and the bottom guard plate 2 is deformed and absorbs the impact energy at the same time; by setting a buffer layer 3 between the bottom guard plate 2 and the liquid cooling plate 1, when the impact point is in the non-flow channel area 11, the bottom guard plate 2 is deformed to absorb energy and contact the buffer layer 3, and the buffer layer 3 is squeezed, and further absorbs the impact energy through its own extrusion, collapse and bending deformation, and because in the non-flow channel area 11, the buffer layer 3 and the liquid cooling plate 1 The intervals are set and the interval area 4 is formed to ensure that the buffer layer 3 will not touch the liquid cooling plate 1 during the deformation process, thereby preventing the liquid cooling plate 1 from being squeezed, and further reducing the impact energy transmitted to the battery cell; when the impact point is in the flow channel area 12, the bottom guard plate 2 and the buffer layer 3 are deformed synchronously, the buffer layer 3 collapses and absorbs energy, and the flow channel area 12 absorbs energy by deformation, ensuring that the deformation of the buffer layer 3 will not touch the battery cell above the liquid cooling plate 1, effectively preventing direct squeezing of the battery cell, thereby reducing the impact energy borne by the battery cell. The present invention realizes that different areas of the battery pack can effectively absorb and disperse the impact force when impacted, ensuring that the battery cells inside the battery pack are not squeezed when the battery pack is subjected to external force, improving the protection level of the battery cells inside the battery pack, and ensuring the overall safety of the battery pack.

[0046] In a specific embodiment, the buffer layer 3 can be made of modified polyphenylene ether foam or nylon foam and other energy-absorbing materials. The density of these two materials ranges from 140 kg / m 3 ~350kg / m 3 , with good energy absorption capacity; the energy absorption of energy-absorbing materials accounts for about 10% to 25%, which can absorb and disperse energy when the battery pack is impacted to protect the battery module.

[0047] In a specific implementation, the material tensile strength of the buffer layer 3 is ≥2.5 MPa, the elongation after fracture is ≥2%, and the stress distribution under a compression rate of 10% is 2-7 MPa.

[0048] In a specific embodiment, in the flow channel area 12 , the top of the buffer layer 3 is bonded to the liquid cooling plate 1 , and the bottom of the buffer layer 3 is bonded to the bottom guard plate 2 .

[0049] In one embodiment, a protruding structure 31 is provided on a side of the buffer layer 3 facing the liquid cooling plate 1 . The protruding structure 31 is disposed in the spacing area 4 and is spaced apart from the bottom of the liquid cooling plate 1 .

[0050] By setting the protruding structure 31, the overall strength of the buffer layer 3 can be increased, so that it can better maintain its structural integrity when subjected to external impact, thereby more effectively absorbing and dispersing energy; and the protruding structure 31 can also change the energy absorption path of the buffer layer 3 when subjected to impact, so that the energy is more evenly distributed in the buffer layer 3, thereby avoiding damage to the buffer layer 3 caused by excessive local energy.

[0051] In a specific implementation, the buffer layer 3 may be provided with a protruding structure 31 on both the side close to the liquid cooling plate 1 and the side close to the bottom guard plate 2 .

[0052] In a specific embodiment, the height of the protrusion structure 31 is d, and 0≤d<the height of the flow channel region 12 .

[0053] Specifically, when the height of the protruding structure 31 is 0, the buffer layer 3 is a solid flat plate structure.

[0054] In one embodiment, the distance between the top of the protruding structure 31 and the bottom of the liquid cooling plate 1 is greater than or equal to 1 mm.

[0055] By setting the distance between the top of the protruding structure 31 and the bottom of the liquid cooling plate 1 to be greater than or equal to 1 mm, it is ensured that there is a sufficient distance interval between the protruding structure 31 and the liquid cooling plate 1, and the necessary deformation space is provided for the protruding structure 31, so that when the battery pack faces external impact, it can effectively prevent direct hard collision between the buffer layer 3 and the liquid cooling plate 1, thereby significantly enhancing the impact resistance and stability of the overall structure of the battery pack.

[0056] In one embodiment, the width of the protruding structure 31 is greater than or equal to 2.5 mm.

[0057] By setting the width of the protruding structure 31 to be greater than or equal to 2.5 mm, the surface area of ​​the buffer layer 3 can be increased to a certain extent, thereby providing more energy absorption area. When the buffer layer 3 is impacted, the protruding structure 31 can more effectively absorb and disperse the impact energy, thereby improving the overall energy absorption efficiency.

[0058] In one embodiment, at least one through hole 32 is disposed on the buffer layer 3 .

[0059] Through the design of the through holes 32, when the buffer layer 3 is impacted, the impact energy can be absorbed and dispersed through the deformation of the through holes 32 and the compression characteristics of the buffer layer 3 itself, thereby effectively reducing the impact force and protecting the impacted area; the design of the through holes 32 not only promotes the uniform distribution of the impact force inside the buffer layer 3, preventing cracks or failures caused by local stress concentration, but also achieves lightweighting while ensuring the original performance of the buffer layer 3, thereby reducing the weight of the overall structure; and by flexibly adjusting the size, number and distribution of the through holes 32, the performance of the buffer layer 3 can be finely optimized without relying on more expensive materials or complex processes, thereby achieving the dual goals of meeting performance requirements and controlling production costs.

[0060] In one embodiment, the through hole 32 is a circular hole, and the diameter of the circular hole is less than 25 mm.

[0061] Since the processing process of the circular hole is more stable and controllable, the scrap rate and production cost are effectively reduced; by setting the diameter of the circular hole to be less than 25 mm, the impact force can be dispersed in a smaller area, so that the buffer layer 3 can absorb energy more evenly when impacted, thereby improving the overall impact resistance; the design of the circular hole and the reasonable aperture can not only enhance the structural strength of the buffer layer 3, but also make the buffer layer 3 more stable when subjected to external force, less prone to deformation or failure, and can reduce the defects and stress concentration points inside the buffer layer 3, thereby improving the overall stability and durability of the buffer layer 3, and can effectively absorb energy.

[0062] In one embodiment, the through hole 32 is a parallelogram hole, and the height of the parallelogram hole is less than 25 mm.

[0063] The design of the parallelogram hole is relatively simple, easy to process and manufacture, which can reduce production costs and improve production efficiency. The hole height less than 25mm can ensure that the material has better flexibility and deformation ability while maintaining sufficient strength, thereby more effectively absorbing impact energy.

[0064] In one embodiment, the through hole 32 is a triangular hole, and the diameter of the inscribed circle of the triangular hole is less than 25 mm.

[0065] Since the triangle has a stable structural characteristic, when the buffer layer 3 is impacted, the triangular hole design can more effectively disperse and absorb the impact force; the restriction that the inscribed circle diameter is less than 25 mm ensures that the size of the through hole 32 is moderate, which can effectively absorb energy without weakening the overall strength of the buffer layer 3 due to the through hole 32 being too large, and also ensures the feasibility and economy of processing.

[0066] In a specific embodiment, the through hole 32 can also be a rectangular hole, the minimum side length of the rectangular hole is less than 25mm; or the through hole 32 can also be a diamond hole, the minimum diagonal of the diamond hole is less than 25mm; or the through hole 32 can also be a trapezoidal hole, the height of the trapezoidal hole is less than 25mm, etc. Specifically, the through hole 32 can also be an opening of other shapes, and the length of the line connecting the two nearest points is less than 25mm. This design can adjust the opening structure of the buffer layer 3 according to actual needs, thereby improving the safety and stability of the battery pack.

[0067] In one embodiment, the thickness of the buffer layer 3 is in the range of 2.5 to 17 mm.

[0068] The buffer layer 3 with a thickness of nearly 17 mm usually has a higher energy absorption capacity and a better buffering effect, and is suitable for occasions that need to withstand a larger impact force; while the buffer layer 3 with a thickness of nearly 2.5 mm may provide a certain amount of energy absorption protection while maintaining lightness, and is suitable for occasions with strict requirements on weight and thickness; therefore, the thickness range of the buffer layer 3 is set between 2.5 and 17 mm, and the most appropriate thickness of the buffer layer 3 can be selected according to specific application requirements and cost budget to achieve a balance between performance and cost; and because the processing and manufacturing process of the buffer layer 3 needs to take the material thickness factor into consideration, within this thickness range, cutting, bending, forming and other processing operations can be more easily performed, thereby achieving comprehensive optimization of performance, cost and processing efficiency.

[0069] In one embodiment, a plurality of the flow channel regions 12 are provided, and the plurality of the flow channel regions 12 are arranged in parallel.

[0070] By arranging multiple flow channel areas 12 in parallel, even if a local flow channel area 12 is subjected to external extrusion or deformation, the coolant can still flow normally in the remaining parallel flow channel areas 12, thereby avoiding the overall thermal management efficiency reduction caused by local blockage, ensuring that the thermal management efficiency of the entire liquid cooling plate 1 can be maintained at a stable and efficient level, and can significantly improve its ability to resist external impact risks and the stability of the overall structure while ensuring the heat dissipation capacity of the liquid cooling plate 1.

[0071] In a specific embodiment, the liquid cooling plate 1 is generally composed of a flow channel plate 13 and a top plate 14. The flow channel plate 13 and the top plate 14 are connected to each other, and the flow channel plate 13 protrudes toward the side away from the top plate 14, so that a flow channel area 12 is formed between the top plate 14 and the flow channel plate 13. Cooling liquid can be set in the flow channel area 12 as required. The specific shape of the flow channel area 12 can be determined according to design requirements. For example, the flow channel area 12 can be an S-shaped flow channel or a long strip flow channel.

[0072] In a specific embodiment, multiple flow channel areas 12 arranged in parallel inside the liquid cooling plate 1 are arranged in parallel at equal intervals along the width direction of the liquid cooling plate 1, so that the coolant can flow through them at the same time; when the coolant flows in from the inlet, it will first be divided along these flow channel areas 12, and then gathered and discharged through the outlet; ensuring the uniform distribution and efficient flow of the coolant in the liquid cooling plate 1, thereby achieving a good heat dissipation effect.

[0073] In a specific implementation, the protruding structures 31 of the buffer layer 3 are designed to conform to the shape of the liquid cooling plate 1 and are distributed at intervals according to the design of the flow channel of the liquid cooling plate 1 .

[0074] In one embodiment, a plurality of convex ribs 21 are provided on a side of the bottom guard plate 2 facing the buffer layer 3 , the plurality of convex ribs 21 are arranged in sequence and spaced apart, and the convex ribs 21 abut against the bottom of the buffer layer 3 .

[0075] By providing the convex rib 21 on the bottom guard plate 2, the local stiffness of the bottom guard plate 2 is improved, thereby enhancing the overall stiffness of the bottom guard plate 2. On the premise of ensuring that the basic strength of the protective plate is effectively guaranteed, its energy absorption capacity can be further improved. This not only optimizes the mechanical properties of the bottom guard plate 2, enabling it to better disperse stress and reduce deformation when subjected to external impact, but also improves the overall safety and stability of the battery pack.

[0076] In one embodiment, the height of the rib 21 is in the range of 1.7 to 5 mm.

[0077] By setting the height range of the rib 21 between 1.7 and 5 mm, not only the local and overall stiffness of the bottom guard plate 2 is enhanced, so that it can better maintain structural stability and reduce deformation when facing external impact or vibration, but also the unnecessary increase in the thickness of the battery pack due to the addition of the rib 21 is avoided. Not only the mechanical properties of the bottom guard plate 2 are optimized, but also the space utilization and overall compactness of the battery pack are significantly improved, achieving dual optimization of the structural stiffness of the bottom guard plate 2 and the thickness control of the battery pack.

[0078] In one embodiment, the thickness of the bottom guard plate 2 is in the range of 0.7 to 1.2 mm.

[0079] By setting the thickness of the bottom guard plate 2 between 0.7 and 1.2 mm, the lightweight design goal of the bottom guard plate 2 is achieved while ensuring that the bottom guard plate 2 provides sufficient protection for the battery pack; compared with the unreasonable design with excessively large or small thickness, the bottom guard plate 2 with a thickness of 0.7 to 1.2 mm not only significantly reduces material consumption and processing difficulty, but also improves production efficiency and product yield, and effectively controls production costs while ensuring high-quality product output, thus having higher economic benefits.

[0080] In one embodiment, the bottom guard plate 2 is a steel guard plate.

[0081] Because the steel guard plate has good impact resistance and rigidity, it can deform and absorb energy when impacted, thereby protecting the battery cells inside the battery pack. It not only improves the overall impact resistance and structural stability of the battery pack, but also extends the service life of the battery cells.

[0082] In a specific implementation, the bottom guard plate 2 is made of hot-formed steel with a yield strength of ≥950Mpa and a tensile strength of ≥1300Mpa.

[0083] According to an embodiment of the present invention, on the other hand, a battery pack is provided, comprising the above-mentioned bottom protection structure for the battery pack.

[0084] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A bottom protection structure for a battery pack, characterized in that: include: A liquid cooling plate (1), wherein the bottom of the liquid cooling plate (1) comprises a non-flow channel area (11) and a protruding flow channel area (12); A bottom guard plate (2) is arranged at the bottom of the liquid cooling plate (1) and is spaced apart from the liquid cooling plate (1); A buffer layer (3) is arranged between the liquid cooling plate (1) and the bottom guard plate (2), and the bottom of the buffer layer (3) abuts against the bottom guard plate (2); in the flow channel area (12), the top of the buffer layer (3) abuts against the liquid cooling plate (1); in the non-flow channel area (11), the top of the buffer layer (3) is spaced from the liquid cooling plate (1) to form a spacing area (4).

2. The bottom protection structure for a battery pack according to claim 1, characterized in that: A protruding structure (31) is provided on one side of the buffer layer (3) facing the liquid cooling plate (1); the protruding structure (31) is arranged in the spacing area (4) and is spaced apart from the bottom of the liquid cooling plate (1).

3. The bottom protection structure for a battery pack according to claim 2, characterized in that: The distance between the top of the protruding structure (31) and the bottom of the liquid cooling plate (1) is greater than or equal to 1 mm; And / or, the width of the protruding structure (31) is greater than or equal to 2.5 mm.

4. The bottom protection structure for a battery pack according to claim 1, characterized in that: The buffer layer (3) is provided with at least one through hole (32).

5. The bottom protection structure for a battery pack according to claim 4, characterized in that: The through hole (32) is a circular hole, and the diameter of the circular hole is less than 25 mm; And / or, the through hole (32) is a parallelogram hole, and the height of the parallelogram hole is less than 25 mm; And / or, the through hole (32) is a triangular hole, and the diameter of the inscribed circle of the triangular hole is less than 25 mm.

6. The bottom protection structure for a battery pack according to any one of claims 1 to 5, characterized in that: The thickness of the buffer layer (3) ranges from 2.5 to 17 mm.

7. The bottom protection structure for a battery pack according to any one of claims 1 to 5, characterized in that: A plurality of the flow channel regions (12) are provided, and the plurality of the flow channel regions (12) are arranged in parallel.

8. The bottom protection structure for a battery pack according to any one of claims 1 to 5, characterized in that: A plurality of convex ribs (21) are provided on one side of the bottom guard plate (2) facing the buffer layer (3); the plurality of convex ribs (21) are arranged in sequence and at intervals, and the convex ribs (21) abut against the bottom of the buffer layer (3).

9. The bottom protection structure for a battery pack according to claim 8, characterized in that: The height of the convex rib (21) ranges from 1.7 to 5 mm.

10. The bottom protection structure for a battery pack according to any one of claims 1 to 5 or 9, characterized in that: The thickness of the bottom guard plate (2) is in the range of 0.7 to 1.2 mm; And / or, the bottom guard plate (2) is a steel guard plate.

11. A battery pack, characterized in that: A bottom protection structure for a battery pack comprising any one of claims 1 to 10.

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