Bottom protection plate assembly, battery pack box body, battery pack and vehicle

Abstract

The utility model provides a bottom guard plate assembly, a battery pack box body, a battery pack and a vehicle. The bottom guard plate assembly comprises a bottom plate, a guard plate and a buffer structure, the bottom plate and the protective plate are stacked and fixedly connected, the bottom plate is provided with a bearing surface, and the bearing surface is used for bearing a battery cell; the buffer structure is arranged in the bottom plate, and / or the buffer structure is arranged in the protective plate; the buffer structure extends in the direction parallel to the bearing face. The bottom protection plate assembly is provided with the buffering structure, the buffering structure has good strength and mechanical performance, can effectively buffer and absorb energy, improves the performance of the bottom protection plate assembly for resisting external load impact, and can effectively absorb and weaken impact force and prevent loads from piercing the bottom protection plate assembly when facing large-strength load impact. Therefore, the borne battery cell is protected from being damaged, and the use safety of the battery pack is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to an underbody guard plate assembly, a battery pack box, a battery pack and a vehicle. Background Art

[0002] With the rapid development of electric vehicles, people have higher and higher safety requirements for electric vehicles. As the power source of electric vehicles, the safety of the power battery pack is an important indicator to measure the safety performance of electric vehicles. In electric vehicles, the power battery pack is often placed at the bottom of the vehicle to provide power output for the vehicle. When the vehicle encounters steep slopes, potholes and other uneven road conditions during driving, the vehicle is prone to bumps and shakes. At this time, the battery pack is easily damaged by foreign objects under the vehicle, causing fires, explosions and other accidents.

[0003] Therefore, in the prior art, the bottom of the battery pack is usually protected by increasing the thickness of the battery pack bottom plate or connecting a reinforcing plate to the battery pack bottom plate to prevent the battery pack from being damaged by foreign objects under the vehicle. However, this protection method has limited ability to resist load impact. When the strength of foreign objects under the vehicle is relatively large, it is still easy to pierce the bottom plate of the battery pack, causing the seal of the battery pack to fail, and even damaging the battery cells inside the battery pack, which seriously threatens the safety of the battery pack. Utility Model Content

[0004] In view of this, the utility model provides a bottom guard plate assembly, a battery pack box, a battery pack and a vehicle, so as to at least solve the problem in the prior art that the bottom of the battery pack has limited protection capability and cannot resist the impact of high-intensity loads.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] The utility model provides a bottom guard plate assembly, comprising a bottom plate, a guard plate and a buffer structure;

[0007] The bottom plate and the guard plate are stacked and fixedly connected, wherein the bottom plate has a bearing surface, and the bearing surface is used to bear the battery cell;

[0008] The buffer structure is arranged in the bottom plate, and / or the buffer structure is arranged in the guard plate; the buffer structure is extended and arranged in a direction parallel to the bearing surface.

[0009] Optionally, a coolant channel is provided in the base plate.

[0010] Optionally, the guard plate includes an upper guard plate and a lower guard plate, the upper guard plate is fixedly connected to the bottom plate, and the lower guard plate is fixedly connected to the upper guard plate;

[0011] A first chamber is formed between the upper guard plate and the lower guard plate, and the buffer structure is arranged in the first chamber.

[0012] Optionally, the upper guard plate has a recessed portion, and the first chamber is formed between the recessed portion and the lower guard plate; the shape and layout position of the recessed portion are the same as the shape and layout position of the coolant flow channel.

[0013] Optionally, the average thickness of the upper guard plate is smaller than the average thickness of the buffer structure, and the average thickness of the lower guard plate is smaller than the average thickness of the buffer structure.

[0014] Optionally, at least one of the upper guard plate and the lower guard plate is a composite plate.

[0015] Optionally, a second chamber is further provided in the bottom plate, and the buffer structure is provided in the second chamber.

[0016] Optionally, the second chamber is stacked with the coolant channel, and the second chamber is located on a side close to the guard plate.

[0017] Optionally, along a direction perpendicular to the bearing surface, a projection of the coolant flow channel is located within a projection of the second chamber.

[0018] Optionally, the buffer structure is also arranged between the bottom plate and the guard plate.

[0019] Optionally, a third chamber is formed between the bottom plate and the guard plate, and the buffer structure is disposed in the third chamber.

[0020] Optionally, a sealing member is further included; the sealing member is arranged between the bottom plate and the guard plate, and is used to seal the third chamber.

[0021] Optionally, the buffer structure has a thickness of 0.05 mm to 100 mm.

[0022] Optionally, the buffer structure is any one of a non-Newtonian fluid, a microporous foamed polypropylene material and a glass fiber material.

[0023] The utility model provides a battery pack box, comprising any one of the above-mentioned bottom guard plate components.

[0024] The utility model provides a battery pack, comprising a battery cell and the aforementioned battery pack box, wherein the battery cell is placed in the battery pack box.

[0025] Optionally, along a direction perpendicular to the bearing surface, a projected area of ​​the buffer structure is larger than a projected area of ​​the battery cell.

[0026] The utility model provides a vehicle, comprising the above-mentioned battery pack.

[0027] Compared with the prior art, the bottom guard plate assembly, battery pack box, battery pack and vehicle described in the utility model have the following advantages:

[0028] In the bottom guard plate assembly of the utility model, a buffer structure is provided in the bottom plate and / or the guard plate. The buffer structure has good strength and mechanical properties, can effectively buffer and absorb energy, and improve the performance of the bottom guard plate assembly in resisting external load impact. When facing high-intensity load impact, the buffer structure can effectively absorb and weaken the impact force to prevent the load from piercing the bottom guard plate assembly, thereby protecting the carried battery cells from damage and ensuring the safe use of the battery pack.

[0029] The battery pack box, battery pack and vehicle of the present invention have the same or similar advantages as the prior art and the aforementioned bottom guard plate assembly, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0031] Figure 1 It is a schematic diagram of a buffer structure arranged in a guard plate in an embodiment of the utility model;

[0032] Figure 2 It is a cross-sectional schematic diagram of a guard plate in an embodiment of the utility model;

[0033] Figure 3 It is a schematic diagram of a buffer structure arranged in a bottom plate in an embodiment of the utility model;

[0034] Figure 4 It is a cross-sectional schematic diagram of the bottom plate in the embodiment of the utility model;

[0035] Figure 5 It is a schematic diagram of a buffer structure arranged between a bottom plate and a guard plate in an embodiment of the utility model;

[0036] Figure 6 It is a schematic cross-sectional view between the bottom plate and the guard plate in an embodiment of the utility model.

[0037] Description of reference numerals:

[0038] 1-bottom plate, 11-cooling liquid flow channel, 12-second chamber, 2-protective plate, 21-upper protective plate, 210-recessed portion, 22-lower protective plate, 23-first chamber, 3-buffer structure, 4-thermal conductive structural adhesive, 5-third chamber, 6-seal, 7-battery cell, 8-frame. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the utility model can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0041] It should be understood that the reference to "some embodiments" throughout the specification means that specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the utility model. Therefore, the "in some embodiments" appearing in various places throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0042] The following describes in detail a bottom guard plate assembly, a battery pack box, a battery pack and a vehicle provided by the utility model by listing specific embodiments.

[0043] Reference Figures 1 to 4 The utility model provides a bottom guard plate assembly, comprising a bottom plate 1, a guard plate 2 and a buffer structure; the bottom plate 1 and the guard plate 2 are stacked and fixedly connected, wherein the bottom plate 1 has a bearing surface, and the bearing surface is used to bear a battery cell 7; the buffer structure is arranged in the bottom plate 1, and / or the buffer structure is arranged in the guard plate 2; the buffer structure is extended and arranged in a direction parallel to the bearing surface.

[0044] Specifically, the bottom guard plate assembly can serve as a part of the battery pack body, used to carry the battery cell 7. The bottom guard plate assembly includes a bottom plate 1, a guard plate 2 and a buffer structure. The bottom plate 1 and the guard plate 2 are stacked and fixedly connected. The methods of fixing the bottom plate 1 and the guard plate 2 include but are not limited to welding, fastener assembly connection, adhesive connection, etc. The connection form is not limited in this embodiment. The bottom plate 1 and the guard plate 2 can be made of aluminum, steel or composite materials, have good strength and rigidity, can effectively carry the battery cell 7 and resist external load impact. In some preferred embodiments, the bottom plate 1 and the guard plate 2 can be processed into plates with a tensile strength greater than 50MPA to ensure the ability of the bottom plate 1 and the guard plate 2 to resist external load impact. The bottom plate 1 has a bearing surface, which is located on the side of the bottom plate 1 away from the guard plate 2. The flatness of the bearing surface is required to be high, and it can fully contact the surface of the battery cell 7 to play a stable bearing role. In some embodiments, the base plate 1 can be a plate-like structure with a higher flatness requirement, and its surface away from the guard plate 2 is the bearing surface. In other embodiments, the base plate 1 is a plate-like structure with a lower flatness requirement, and the portion of its surface away from the guard plate 2 is the bearing surface.

[0045] There are three implementation modes for setting the buffer structure in the bottom guard plate assembly. In the first implementation mode, Figure 3 and Figure 4 As shown, the bottom plate 1 has a cavity structure inside, and the buffer structure is arranged in the cavity of the bottom plate 1; in the second embodiment, as shown in Figure 1 and Figure 2As shown, the guard plate 2 has a cavity structure inside, and the buffer structure is arranged in the cavity of the guard plate 2; in the third embodiment, the bottom plate 1 and the guard plate 2 both have a cavity structure, and the buffer structure is arranged in the cavity of the bottom plate 1 and the guard plate 2 respectively. The buffer structure has good strength and mechanical properties, and can effectively buffer and absorb energy, thereby improving the performance of the bottom guard plate assembly to resist the impact of external loads. It can be understood that in the first and second embodiments above, the structure of the bottom guard plate assembly is simpler, the processing method is easier, and the processing cost is lower. In the third embodiment above, the buffer energy absorption of the bottom guard plate assembly is better, and the ability to resist the impact of external loads is stronger. The buffer structure can be a non-Newtonian fluid, which refers to a fluid that does not satisfy Newton's law of internal friction, such as petroleum, toothpaste, a concentrated solution or suspension of a polymer, etc. Of course, as a buffer structure, a concentrated solution or suspension of a polymer can be selected. In practical applications, the buffer structure can be encapsulated using a high-strength fiber bag or an ordinary plastic bag, and then the encapsulated buffer structure is installed in the cavity of the bottom plate 1 and / or the guard plate 2. The buffer structure can also be MPP (Microcellular Polypropylene foam, microporous foamed polypropylene) material. MPP material refers to a polypropylene porous foam material with a pore size of less than 100 μm. Its pore size is small and the loss of mechanical properties is small, which helps to save materials and reduce the total weight and volume of the buffer structure. At the same time, the MPP material has excellent shock absorption, buffering, heat insulation, energy absorption and other characteristics. The buffer structure can also be a glass fiber material. The glass fiber material has the characteristics of light weight, high strength, corrosion resistance, electrical insulation, etc. In some preferred embodiments, a seal 6 can be added to the cavity of the base plate 1 and / or the guard plate 2. The seal 6 includes but is not limited to a rubber seal ring, a silicone seal ring, etc., and the specific form is not limited in this embodiment. The seal 6 can seal the buffer structure in the cavity of the base plate 1 and / or the guard plate 2 to avoid leakage of the buffer structure.

[0046] Since the external force impacts on the bottom guard plate assembly during the process of carrying the battery cell 7 are mostly vertical forces, the direction of the force intersects with the direction of the bearing surface, and the two are closer to vertical, the force-bearing part of the bottom guard plate assembly is the side of the guard plate 2 away from the bottom plate 1, and the force is transmitted from the guard plate 2 to the bottom plate 1, and then from the bottom plate 1 to the carried battery cell 7. Therefore, in the embodiment of the utility model, the buffer structure is extended and arranged in a direction parallel to the bearing surface on the bottom plate 1, that is, the extending arrangement direction of the buffer structure is parallel to the surface of the battery cell 7 close to the bottom plate 1, which can increase the range of the buffer structure to buffer the external force impact to a certain extent, thereby improving the protection ability of the bottom guard plate 2 protection assembly. Furthermore, in order to ensure the buffering energy absorption capacity of the buffer structure, the thickness of the buffer structure can be set to 0.05mm~100mm. Of course, if the strength of the bottom plate 1 and / or the guard plate 2 is greater, the total amount of the buffer structure that needs to be filled can be less, and the thickness of the buffer structure can be set to be thinner accordingly. If the strength of the bottom plate 1 and / or the guard plate 2 is smaller, the total amount of the buffer structure that needs to be filled needs to be more, and the thickness of the buffer structure can be set to be thicker accordingly. In addition, if the battery pack is used in a good scenario, such as the battery pack is placed in an energy storage cabinet or an integrated cabinet and is in a static state for a long time, the bottom of the battery pack is not easily impacted by external force or the external force impact is small, then the thickness of the buffer structure can be set closer to 0.05mm; if the battery pack is used in a general scenario, such as the battery pack is used in electric vehicles that often travel on flat roads, the bottom of the battery pack is easily impacted by external force, but the external force impact will not be too large, then the thickness of the buffer structure can be set closer to 50mm; if the battery pack is used in a relatively bad scenario, such as the battery pack is used in electric vehicles that often travel on mountain roads, steep slopes, and bumpy roads, the bottom of the battery pack is easily impacted by large external force, then the thickness of the buffer structure can be set closer to 100mm.

[0047] In summary, a buffer structure is provided in the bottom plate 1 and / or the guard plate 2 of the bottom guard plate assembly of the utility model. The buffer structure has good strength and mechanical properties, can effectively buffer and absorb energy, and improve the performance of the bottom guard plate assembly to resist external load impact. When facing high-intensity load impact, the buffer structure can effectively absorb and weaken the impact force to prevent the load from piercing the bottom guard plate assembly, thereby protecting the carried battery cell 7 from damage and ensuring the safe use of the battery pack.

[0048] Optionally, refer to Figure 4 A coolant channel 11 is provided in the base plate 1 .

[0049] Specifically, in this embodiment, a coolant flow channel 11 is provided in the bottom plate 1. The coolant flow channel 11 can be punched by a stamping process, that is, the bottom plate 1 is composed of two stamping plates. The coolant flow channel 11 can also be processed by a machining process. The coolant flow channel 11 is used to circulate the coolant. During the flow of the coolant, it will absorb and take away part of the heat generated by the battery cell 7 during the charging and discharging process, thereby achieving heat dissipation and cooling of the battery cell 7 and the battery pack. In the case where there is a coolant flow channel 11 in the bottom plate 1, it is equivalent to directly using the liquid cooling plate as the bottom plate 1. The liquid cooling plate is arranged at the bottom of the battery pack, which can not only carry the battery cell 7, but also achieve heat dissipation and cooling of the battery cell 7. In some embodiments, a thermally conductive structural adhesive 4 is further provided between the base plate 1 and the guard plate 2. The thermally conductive structural adhesive 4 is mainly composed of a resin matrix and a thermally conductive functional filler, and has both strong bonding ability and thermal conductivity. It is provided between the base plate 1 and the guard plate 2 to further enhance the connection reliability between the base plate 1 and the guard plate 2, and at the same time helps to transfer the heat on the base plate 1 to the guard plate 2, and then diffuse it to the external environment, thereby realizing heat dissipation and cooling inside the battery pack.

[0050] Optionally, refer to Figure 1 and Figure 2 In the embodiment where the buffer structure is disposed in the guard plate 2, the guard plate 2 includes an upper guard plate 21 and a lower guard plate 22. Both the upper guard plate 21 and the lower guard plate 22 are plates with relatively high strength performance. The upper guard plate 21 is fixedly connected to the lower guard plate 22. The forms of fixed connection include but are not limited to welding, fastener assembly connection, adhesive connection, etc., wherein the upper guard plate 21 is located on the side close to the bottom plate 1 and is fixedly connected to the bottom plate 1. Similarly, the forms of fixed connection between the upper guard plate 21 and the bottom plate 1 also include but are not limited to welding, fastener assembly connection, adhesive connection, etc. After the upper guard plate 21 and the lower guard plate 22 are fixedly connected, a first chamber 23 is formed between the upper guard plate 21 and the lower guard plate 22, and the buffer structure is filled in the first chamber 23.

[0051] In a further embodiment, Figure 1As shown, the upper guard plate 21 has a recessed portion 210, and a first chamber 23 is formed between the recessed portion 210 and the lower guard plate 22. Since the coolant flow channel 11 on the bottom plate 1 usually protrudes from the surface of the bottom plate 1, the surface of the bottom plate 1 close to the guard plate 2 is an uneven surface. Accordingly, in this embodiment, a recessed portion 210 is provided on the upper guard plate 21 connected to the bottom plate 1. The shape and layout position of the recessed portion 210 are the same as the shape and layout position of the coolant flow channel 11 on the bottom plate 1. For ease of processing, the recessed portion 210 can be formed by stamping, and a first chamber 23 for filling the buffer structure is formed between the recessed portion 210 and the lower guard plate 22, thereby realizing the conformal design of the buffer structure and the coolant flow channel 11, which can not only ensure the protective effect of the buffer structure on the coolant flow channel 11 under external force impact, but also control the resource cost of the buffer structure, and at the same time make the connection between the bottom plate 1 and the upper guard plate 21 more stable and reliable, thereby improving the reliability of the bottom guard plate assembly.

[0052] In a further embodiment, in order to ensure the buffering and energy-absorbing effect of the buffer structure and control the weight of the guard plate 2 at the same time, the average thickness of the upper guard plate 21 is set to be less than the average thickness of the buffer structure, and the average thickness of the lower guard plate 22 is set to be less than the average thickness of the buffer structure. Under the influence of processing errors, the thickness of each part of the upper guard plate 21 and the lower guard plate 22 may be different, and the average thickness of the upper guard plate 21 refers to the average value of the thickness of each part of the upper guard plate 21. In practical applications, the thickness of several specific parts of the upper guard plate 21 can be selected to obtain the value, such as the thickness of the edge part and the thickness of the middle part, and then the average of these thicknesses can be obtained. Similarly, the average thickness of the lower guard plate 22 refers to the average value of the thickness of each part of the lower guard plate 22. In practical applications, the thickness of several specific parts of the lower guard plate 22 can be selected to obtain the value. The average thickness of the buffer structure refers to the average value of the thickness of each part of the buffer structure. If the thickness of the corner part of the buffer structure is too thin, the thickness of other parts of the buffer structure can be selected to obtain the value. In addition, since the lower guard plate 22 needs to provide greater support, the thickness of the lower guard plate 22 can be set greater than the thickness of the upper guard plate 21, or the yield strength of the lower guard plate 22 can be set greater than the yield strength of the upper guard plate 21.

[0053] In a further embodiment, at least one of the upper guard plate 21 and the lower guard plate 22 is a composite plate, and the composite plate is processed from a composite material. The composite material is a new material formed by optimizing and combining material components of different properties. The composite material not only maintains the advantages of the performance of each component material, but also can obtain comprehensive performance that a single component material cannot achieve through the complementarity and association of the performance of each component. The matrix material of the composite material includes two major categories: metal and non-metal. The commonly used metal matrix is ​​aluminum, magnesium, copper, titanium and its alloys, and the commonly used non-metal matrix is ​​synthetic resin, rubber, ceramic, graphite, carbon, etc. In addition, the composite material usually also has a reinforcing material, and the commonly used reinforcing materials are glass fiber, carbon fiber, boron fiber, silicon carbide fiber, asbestos fiber, etc. Composite materials have a small specific gravity, a large specific strength, and are corrosion-resistant. They are usually used to improve the strength of the board, reduce the weight of the board, and at the same time improve the thermal insulation capacity of the board. In the present embodiment, at least one of the upper guard plate 21 and the lower guard plate 22 is made of a composite plate, which can effectively improve the strength of the guard plate 2, reduce the total weight of the guard plate 2, prevent the guard plate 2 from being corroded by the buffer structure, and extend the service life of the guard plate 2. At the same time, it helps to improve the heat insulation ability of the guard plate 2, and prevent the guard plate 2 from rising with the temperature of the battery cell 7, causing burns when people touch it.

[0054] Optionally, refer to Figure 3 and Figure 4 In the embodiment where the buffer structure is disposed in the base plate 1 , in addition to the coolant flow channel 11 , the base plate 1 is also provided with a second chamber 12 , and the buffer structure is filled in the second chamber 12 .

[0055] In a further embodiment, the second chamber 12 and the coolant flow channel 11 are stacked, the second chamber 12 is located on the side close to the guard plate 2, and the coolant flow channel 11 is located on the side away from the guard plate 2. The second chamber 12 has an inlet and an outlet of a buffer structure, and the inlet and the outlet can be set at two ends of the second chamber 12 with a large distance between them. The coolant flow channel 11 has an inlet and an outlet, and the inlet and the outlet can be set at two ends of the coolant flow channel 11 with a large distance between them. Since the coolant has good fluidity and is not easy to adhere or bond to the inner wall of the flow channel, while the fluidity of the buffer structure is poor or has no fluidity, the height of the second chamber 12 can be set to 1mm to 50mm and the height of the coolant flow channel 11 can be set to 1mm to 10mm in the direction perpendicular to the bearing surface. Of course, if the strength of the bottom plate 1 is greater, the total amount of the buffer structure to be filled can be less, and the height of the second chamber 12 can be set lower accordingly; if the strength of the bottom plate 1 is weaker, the total amount of the buffer structure to be filled needs to be more, and the height of the second chamber 12 can be set higher accordingly. Figure 4As shown, the coolant flow channel 11 and the second chamber 12 can also be a double-layer structure, with two layers of coolant flow channels 11 stacked and two layers of second chambers 12 stacked, forming a total of four layers of structure in the bottom plate 1. Of course, the coolant flow channel 11 and the second chamber 12 can also be a multi-layer structure, which can be specifically set according to the cooling requirements and the thickness of the bottom plate, and this embodiment is not limited to this.

[0056] In a further embodiment, along a direction perpendicular to the bearing surface, the projection of the coolant channel 11 is arranged to be located within the projection of the second chamber 12 to ensure that the buffer structure protects the coolant channel 11 in the event of an external force impact.

[0057] Optionally, refer to Figure 5 and Figure 6 The buffer structure 3 is also arranged between the base plate 1 and the guard plate 2.

[0058] Specifically, on the basis that the buffer structure 3 is disposed inside the bottom plate 1 and / or the guard plate 2, in this embodiment, the buffer structure 3 is also disposed between the bottom plate 1 and the guard plate 2 to further enhance the strength of the bottom guard plate assembly and the ability to resist external load impact. For example, a third chamber 5 is formed between the bottom plate 1 and the guard plate 2, and the buffer structure 3 is filled in the third chamber 5.

[0059] In a further embodiment, Figure 5 and Figure 6 As shown, the bottom guard plate assembly also includes a seal 6, which is arranged between the bottom plate 1 and the guard plate 2. The seal 6 includes but is not limited to structural adhesive, foam ring, silicone ring, rubber ring, etc., which can effectively seal the third chamber 5 to prevent leakage of the buffer structure 3. The surface of the buffer structure 3 close to the bottom plate 1 can also be provided with a groove, and the shape and layout position of the groove are the same as the shape and layout position of the coolant flow channel 11, so as to realize the conformal design of the buffer structure 3 and the coolant flow channel 11, and ensure the protective effect of the buffer structure 3 on the coolant flow channel 11 under the impact of external force.

[0060] Reference Figure 1 , Figure 3 and Figure 5 The utility model also provides a battery pack box, including any of the above-mentioned bottom guard plate assemblies.

[0061] Specifically, the battery pack box is composed of a frame 8 and a bottom guard plate assembly, which is fixedly connected to the frame 8, and the connection forms include but are not limited to welding, fastener assembly connection, etc. After the connection, the bottom guard plate assembly serves as the bottom of the battery pack box. The bottom guard plate assembly has good strength and resistance to external load impact, thereby improving the overall strength of the battery pack box and the resistance to external load impact.

[0062] Reference Figure 1, Figure 3 and Figure 5 The utility model also provides a battery pack, including a battery cell 7 and the aforementioned battery pack box, wherein the battery cell 7 is placed in the battery pack box.

[0063] Specifically, there are multiple battery cells 7, which are placed in an orderly manner in the battery pack box. The bottom guard plate assembly supports the battery cells 7 in the box. After the multiple battery cells 7 are installed in the battery pack box, the box can be sealed by a cover plate to form a complete battery pack structure.

[0064] In some preferred embodiments, the projection of the battery cell 7 can be arranged to be located within the projection of the buffer structure 3 along a direction perpendicular to the bearing surface on the bottom plate 1 of the bottom guard plate assembly, so as to ensure that the buffer structure 3 can effectively protect the bottom of each battery cell 7, thereby further improving the safety of the battery pack.

[0065] The utility model also provides a vehicle, comprising any one of the above-mentioned battery packs.

[0066] Specifically, the vehicle can be a pure electric vehicle or a hybrid vehicle. The vehicle includes a battery pack of any of the aforementioned items. The battery pack has good overall strength and performance in resisting external load impact, which helps to provide the vehicle with stable and reliable power output and ensure the vehicle's driving safety.

[0067] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bottom guard plate assembly, characterized in that: Including bottom plate, guard plate and buffer structure; The bottom plate and the guard plate are stacked and fixedly connected, wherein the bottom plate has a bearing surface, and the bearing surface is used to bear the battery cell; The buffer structure is arranged in the bottom plate, and / or the buffer structure is arranged in the guard plate; the buffer structure is extended and arranged in a direction parallel to the bearing surface.

2. The bottom guard plate assembly according to claim 1, characterized in that: A cooling liquid flow channel is arranged in the bottom plate.

3. The bottom guard plate assembly according to claim 2, characterized in that: The guard plate comprises an upper guard plate and a lower guard plate, wherein the upper guard plate is fixedly connected to the bottom plate, and the lower guard plate is fixedly connected to the upper guard plate; A first chamber is formed between the upper guard plate and the lower guard plate, and the buffer structure is arranged in the first chamber.

4. The bottom guard plate assembly according to claim 3, characterized in that: The upper guard plate has a recessed portion, and the first chamber is formed between the recessed portion and the lower guard plate; the shape and layout position of the recessed portion are the same as the shape and layout position of the coolant flow channel.

5. The bottom guard plate assembly according to claim 3, characterized in that: The average thickness of the upper guard plate is smaller than the average thickness of the buffer structure, and the average thickness of the lower guard plate is smaller than the average thickness of the buffer structure.

6. The bottom guard plate assembly according to claim 3, characterized in that: At least one of the upper guard plate and the lower guard plate is a composite plate.

7. The bottom guard plate assembly according to claim 2, characterized in that: A second chamber is also provided in the bottom plate, and the buffer structure is provided in the second chamber.

8. The bottom guard plate assembly according to claim 7, characterized in that: The second chamber is stacked with the coolant channel, and the second chamber is located on a side close to the guard plate.

9. The bottom guard plate assembly according to claim 8, characterized in that: Along a direction perpendicular to the bearing surface, a projection of the coolant flow channel is located within a projection of the second chamber.

10. The bottom guard plate assembly according to claim 2, characterized in that: The buffer structure is also arranged between the bottom plate and the guard plate.

11. The bottom guard plate assembly according to claim 10, characterized in that: A third chamber is formed between the bottom plate and the guard plate, and the buffer structure is arranged in the third chamber.

12. The underbody guard assembly according to claim 11, characterized in that: It also includes a sealing member; the sealing member is arranged between the bottom plate and the guard plate and is used for sealing the third chamber.

13. The underbody guard assembly according to claim 1, characterized in that: The thickness of the buffer structure is 0.05 mm to 100 mm.

14. The underbody guard assembly according to claim 1, characterized in that: The buffer structure is any one of a non-Newtonian fluid, a microporous foamed polypropylene material and a glass fiber material.

15. A battery pack box, characterized in that: Comprising the bottom guard plate assembly according to any one of claims 1 to 14.

16. A battery pack, characterized in that: It comprises a battery cell and the battery pack case as claimed in claim 15, wherein the battery cell is placed in the battery pack case.

17. The battery pack according to claim 16, characterized in that: Along a direction perpendicular to the bearing surface, a projection area of ​​the buffer structure is larger than a projection area of ​​the battery cell.

18. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 16 or 17.

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