Battery bottom protection plate, battery pack and vehicle

Abstract

The utility model discloses a battery bottom guard plate, battery pack and vehicle, including bottom plate and protective layer, the protective layer is provided the outside of bottom plate, the scratch resistance of protective layer is higher than the scratch resistance of bottom plate. The battery bottom protection plate disclosed by the utility model is good in scratch resistance and wear resistance, the condition that the battery bottom protection plate is easily scratched and damaged is avoided, and the overall protection performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly to a battery bottom guard plate, a battery pack and a vehicle. Background Art

[0002] In recent years, new energy vehicles have developed rapidly. As the power source of new energy vehicles, the performance of power batteries directly determines the use experience of vehicles. In order to balance the weight of the vehicle and reduce the center of gravity, the power batteries in the prior art are usually installed at the chassis of the vehicle and are easily contacted with foreign objects on the road surface. Therefore, the bottom protection of the battery is particularly important. However, the battery bottom guard plates in the prior art have problems such as poor abrasion resistance and easy to be scratched and damaged. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to some extent.

[0004] To this end, an embodiment of the utility model provides a battery bottom guard plate, which has good scratch resistance and wear resistance, avoids the situation of being easily scratched and damaged, and improves the overall protection performance.

[0005] An embodiment of the utility model further provides a battery pack including the above battery bottom guard plate.

[0006] An embodiment of the utility model further provides a vehicle including the above battery pack.

[0007] The battery bottom guard plate of the embodiment of the utility model includes:

[0008] A bottom plate;

[0009] A protective layer, which is arranged on the outer side of the bottom plate, and the scratch resistance of the protective layer is higher than that of the bottom plate.

[0010] In some embodiments, the bottom plate has a cell area opposite to the cell, and in the thickness direction of the bottom plate, the projection of the cell area is within the projection range of the protective layer.

[0011] In some embodiments, the bottom plate includes:

[0012] A metal layer;

[0013] A first support layer and a second support layer, which are respectively arranged on both sides of the metal layer in the thickness direction, and the second support layer is located between the metal layer and the protective layer.

[0014] In some embodiments, the base plate includes a frame, the frame is disposed on the outer peripheral side of the metal layer, and the frame and the metal layer are both disposed between the first supporting layer and the second supporting layer.

[0015] In some embodiments, the thickness of the metal layer is consistent with the thickness of the frame.

[0016] In some embodiments, there are multiple metal layers, and the frame is provided with multiple matching holes, and the multiple metal layers are respectively embedded in the multiple matching holes.

[0017] In some embodiments, the material of the protective layer includes polyurea;

[0018] And / or, the first supporting layer, the second supporting layer, and the frame are made of continuous glass fiber thermoplastic composite material;

[0019] And / or, the metal layer is a steel plate.

[0020] In some embodiments, in the thickness direction of the bottom plate, the projection of the metal layer coincides with the projection of the battery core area, and the protective layer only covers the surface area of ​​the second supporting layer corresponding to the projection of the metal layer.

[0021] In some embodiments, a ratio of a thickness dimension of the protective layer to a thickness dimension of the second supporting layer is no greater than 1.

[0022] In some embodiments, the base plate includes a first flat plate portion and a second flat plate portion, the second flat plate portion is arranged on the peripheral side of the first flat plate portion and is staggered with the first flat plate portion in the thickness direction of the base plate, the protective layer is arranged on the first flat plate portion, and the second flat plate portion is provided with a connection hole for connecting to the box body of the battery pack.

[0023] The battery pack of the embodiment of the utility model includes a battery bottom guard plate as described in any of the above embodiments.

[0024] The vehicle of the embodiment of the utility model includes a battery pack as described in any of the above embodiments.

[0025] Beneficial effects: The battery bottom guard plate, battery pack and vehicle of the embodiments of the utility model have good scratch resistance and wear resistance, which avoids the situation of being easily damaged by scratches and improves the overall protection performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a side view schematic diagram of the battery bottom guard plate of an embodiment of the utility model.

[0027] Figure 2 It is an exploded schematic diagram of the battery bottom guard plate of an embodiment of the utility model.

[0028] Figure 3 It is a schematic diagram of the bottom side of the battery bottom protection plate according to an embodiment of the present utility model.

[0029] Figure 4 It is a schematic diagram of the bottom plate according to an embodiment of the present utility model.

[0030] Reference numerals:

[0031] 1 - Bottom plate; 11 - First support layer; 12 - Metal layer; 13 - Second support layer; 14 - Frame; 141 - Fitting hole; 142 - Connection hole; 15 - Cell area; 16 - Locking area; 17 - First flat part; 18 - Second flat part;

[0032] 2 - Protection layer. Detailed implementation manners

[0033] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0034] The present utility model is based on the inventor's discovery and recognition of the following facts and problems:

[0035] In the related art, since the battery pack is exposed to the bottom of the whole vehicle over a large area, the bottom of the battery pack is easily damaged by stones, bricks, speed bumps, slopes, etc. Such damage occurs at the bottom of the battery pack, is not easily detected and has strong concealment. If the user cannot discover and handle it in time, the internal cells, high - voltage components, etc. of the battery pack will be continuously squeezed, thus easily causing safety accidents such as thermal runaway, fire and explosion.

[0036] Secondly, the bottom protection plate of the battery pack in the prior art usually adopts a design of steel plate plus bottom - sprayed PVC. In actual use, the probability of PVC layer peeling off is relatively high and it is easily scratched. When the PVC is scratched or peeled off, the exposed steel plate is easily rusted and corroded, resulting in a shortened life cycle of the bottom protection plate and also weakening the bottom protection of the whole vehicle, which is not conducive to driving safety.

[0037] The battery bottom protection plate according to an embodiment of the present utility model will be described below.

[0038] As Figure 1 and Figure 2 shown, the battery bottom protection plate according to an embodiment of the present utility model includes a bottom plate 1 and a protection layer 2. Among them, the bottom plate 1 is used to be installed on the bottom side of the battery pack, and the bottom plate 1 has a certain structural strength, so as to meet the use requirements of bottom protection.

[0039] The protective layer 2 is provided on the outer side of the bottom plate 1. For example, the protective layer 2 can be sprayed on the bottom side of the bottom plate 1. The scratch resistance of the protective layer 2 is higher than that of the bottom plate 1. Thus, when the vehicle is running, due to the protection of the protective layer 2, the bottom plate 1 will not be scratched by stones, bricks, etc. on the road surface, thereby achieving a good protection effect.

[0040] It should be noted that the quality of the scratch resistance can be judged by the scratch resistance grade. The scratch resistance grade is a quantitative index for evaluating the scratch resistance of materials through a series of test methods. The test conditions for scratch resistance include the radius, thickness, surface hardness of the scratch head, and the scratching speed, etc. Through these tests, physical properties such as the compressive yield strength, strain hardening performance, tensile strength, tensile toughness, tensile strain hardening performance, and friction coefficient of the material can be evaluated. The overall scratch resistance performance can be judged by the specific indexes of these tests.

[0041] In addition, the scratch resistance test can adopt test methods specified by ISO, and the scratch resistance of a single coating or a multi-layer composite coating system of paint, varnish or related products can be determined by using a scribe needle loaded with a specified load under specified conditions. These standards can provide a basis for evaluating the hardness and scratch resistance of the coating surface.

[0042] For the battery bottom guard plate of the embodiment of the present utility model, the bottom plate 1 can make the bottom guard plate have better impact resistance. By providing a protective layer 2 on the bottom side of the bottom plate 1, the scratch resistance and wear resistance of the battery bottom guard plate can be improved through the protective layer 2, avoiding the situation that the battery bottom guard plate is easily scratched and damaged, and improving the overall protection performance.

[0043] In some embodiments, the bottom plate 1 has a battery cell area 15 opposite to the battery cell. For example, the battery cell is placed above the bottom plate 1, and the battery cell area 15 can be regarded as the area formed by the projection of the battery cell on the bottom plate 1.

[0044] In the thickness direction of the bottom plate 1, the projection of the battery cell area 15 is within the projection range of the protective layer 2. For example, as Figure 3 shown, the projection of the battery cell area 15 on the bottom side of the bottom plate 1 can generally be a rectangular area. The protective layer 2 can be provided only within this rectangular area, that is, the projection of the protective layer 2 and the projection of the battery cell area 15 completely coincide, so that the arrangement of the protective layer 2 is more targeted, can meet the arrangement requirements for the protection of the battery cell, and can also reduce the material consumption of the protective layer 2 and lower the cost.

[0045] In some embodiments, the bottom plate 1 includes a metal layer 12, a first support layer 11 and a second support layer 13. The first support layer 11 and the second support layer 13 are respectively provided on both sides of the metal layer 12 in the thickness direction, and the second support layer 13 is located between the metal layer 12 and the protective layer 2.

[0046] For example, as Figure 1 and Figure 2 shown, the metal layer 12, the first support layer 11, and the second support layer 13 can all be generally flat and rectangular. The metal layer 12 can be generally horizontally arranged. The first support layer 11 can cover the upper surface of the metal layer 12, and the second support layer 13 can cover the lower surface of the metal layer 12. The protective layer 2 can be sprayed on the outer side of the second support layer 13, that is, sprayed on the bottom surface of the second support layer 13. Thus, the bottom plate 1 is a composite multi-layer structure, and the overall performance of the bottom plate 1 can be improved by the different characteristics of the materials of different layers.

[0047] In some embodiments, the bottom plate 1 includes a frame 14. The frame 14 is provided on the outer peripheral side of the metal layer 12, and both the frame 14 and the metal layer 12 are provided between the first support layer 11 and the second support layer 13.

[0048] For example, as Figure 2 shown, the frame 14 can be generally square-shaped. The frame 14 can be fixed on the outer peripheral side of the metal layer 12 and extend along the outer peripheral side of the metal layer 12 to close into a circle. During assembly, the frame 14 can be fixed between the first support layer 11 and the second support layer 13, and the metal layer 12 can be located in the sealed space surrounded by the first support layer 11, the frame 14, and the second support layer 13.

[0049] Thus, the metal layer 12 can be completely covered and hidden, avoiding the situation where the metal layer 12 is exposed to the external environment, and further avoiding problems such as easy corrosion of the metal layer 12, which is beneficial to extending the service life of the battery bottom guard plate and can also play a role in improving the overall structural strength of the battery bottom guard plate.

[0050] Optionally, the material of the frame 14 can be the same as the materials of the above-mentioned first support layer 11 and second support layer 13, which facilitates the sealed connection and fixation of the frame 14 with the above-mentioned first support layer 11 and second support layer 13.

[0051] In some embodiments, the thickness dimension of the metal layer 12 is the same as the thickness dimension of the frame 14. For example, as Figure 2 shown, the thickness dimension of the metal layer 12 can be regarded as the dimension of the metal layer 12 in the up and down directions, and the thickness dimension of the frame 14 can be regarded as the dimension of the frame 14 in the up and down directions. Thus, the flatness of the overall upper surface and lower surface after the frame 14 and the metal layer 12 are assembled can be achieved, and further, a large bonding area with the above-mentioned first support layer 11 and the above-mentioned second support layer 13 is ensured, avoiding the situation where assembly gaps are easily generated due to different thicknesses of the frame 14 and the metal layer 12, and further ensuring the overall structural strength and the structural stability of the assembly.

[0052] In some embodiments, there are multiple metal layers 12. A plurality of fitting holes 141 are provided in the housing 14, and the multiple metal layers 12 are respectively embedded in the multiple fitting holes 141. For example, as Figure 2 shown, the housing 14 as a whole can be in the shape of a square frame. Two fitting holes 141 can be provided in the housing 14. Both of the two fitting holes 141 can be rectangular holes, and the two fitting holes 141 are arranged at intervals in the width direction of the battery bottom guard plate.

[0053] As Figure 2 shown, there can be two metal layers 12, and the two metal layers 12 are respectively and correspondingly embedded in the two fitting holes 141 of the housing 14. Thus, the metal layers 12 can correspond to the battery cells at different positions respectively, so that the arrangement of the metal layers 12 is more targeted.

[0054] In some embodiments, the material of the protective layer 2 includes polyurea. The polyurea coating has good adhesion to various substrates, thus ensuring good adhesion between the protective layer 2 and the second support layer 13 and avoiding the situation that the protective layer 2 easily falls off.

[0055] Secondly, polyurea coatings have strong advantages in terms of impact resistance, wear and scratch resistance, and anti-abnormal noise. In addition, polyurea coatings also have extremely strong advantages in dealing with transient high-impact and blasting, etc. Moreover, compared with materials such as polyvinyl chloride (PVC), the polyurea material has a fast curing speed and is environmentally friendly and pollution-free.

[0056] During use, the polyurea coating material can be formed into a uniform aerosol through a high-pressure spraying device and fall on the second support layer 13. The cured polyurea coating material will form a super tough protective coating on the outer surface of the second support layer 13.

[0057] Due to the strong scratch resistance and impact resistance of the polyurea coating, when the car during driving runs over stones or bricks on the road, splashes, hits the roadside edge, hits when going uphill, drives through muddy roads, passes over speed bumps, or hits the curb, etc., due to the protection of the protective layer 2, the second support layer 13 will not be scratched.

[0058] Due to the spraying method, if the protective layer 2 is scratched, only the scratched area needs to be sprayed. The overall maintenance cost and after-sales service are simple, and the cost-benefit is relatively high. Without the protective layer 2, when the second support layer 13 is scratched, the entire battery pack needs to be repaired and replaced, and both the cost and after-sales service are relatively high. Moreover, when the second support layer 13 is scratched, the metal layer will be exposed, causing a risk of rust. The super tough protective layer 2 also exhibits super strong acid resistance, alkali resistance, chemical resistance, and corrosion resistance, thus fully meeting the usage requirements of bottom protection.

[0059] The polyurea coating also has extremely strong advantages during high-speed impact. When an electric vehicle is traveling at high speed and encounters impacts from stones or obstacles, the polyurea coating can quickly increase hardness and consume most of the energy, thereby effectively reducing the impact force caused by impacts such as stones, preventing the stones from penetrating, reducing the damage to the battery pack by the stones or obstacles, and fully ensuring the safety of the battery pack during use.

[0060] In some embodiments, the first support layer 11, the second support layer 13, and the frame 14 are made of continuous fiberglass thermoplastic composite materials. As Figure 1 shown, both the first support layer 11 and the second support layer 13 can be fiberglass layers (glass fiber layers). The fiberglass layer can be prepared by completely infiltrating continuous glass fibers with a thermoplastic resin in a molten state through high-temperature heating. The continuous glass fibers can be unidirectional continuous fibers or woven continuous fibers. The thermoplastic resin can be materials such as PP (polyethylene), PA (nylon), etc.

[0061] The frame 14 can also be processed and formed using a fiberglass layer. Thus, during processing, the first support layer 11, the frame 14, and the second support layer 13 can be hot-pressed and formed. Thereby, the sealing of the outer peripheral side of the metal layer 12 is ensured, and the situation where the metal layer 12 is exposed is avoided.

[0062] In some embodiments, the metal layer 12 is a steel plate. The steel plate has relatively high structural strength, thus fully meeting the usage requirements for bottom protection. In some other embodiments, the metal layer 12 can also be other metal materials such as aluminum or aluminum alloy.

[0063] In some embodiments, in the thickness direction of the bottom plate 1, the projection of the metal layer 12 coincides with the projection of the battery cell area 15. The protective layer 2 only covers the surface area of the second support layer 13 corresponding to the projection of the metal layer 12, and the frame is provided with connection holes 142 for fasteners to pass through.

[0064] Specifically, as Figure 3 shown, the projection of the metal layer 12 in the up and down direction can be regarded as the above-mentioned battery cell area 15, that is, the area of the metal layer 12 is generally consistent with the area of the above-mentioned battery cell area 15. When arranging the protective layer 2, the protective layer 2 can be sprayed only within the range enclosed by the projection of the metal layer 12 on the second support layer 13.

[0065] As Figure 3 shown, the outer peripheral contour of the frame 14 can be slightly larger than the first support layer 11 and the second support layer 13. Thus, a part of the frame 14 can extend to the outside of the first support layer 11 and the second support layer 13 and form a locking area 16. The above-mentioned connection holes 142 can be all arranged on the locking area 16 of the frame 14, and there can be multiple connection holes 142 and they are arranged at intervals along the circumferential direction of the frame 14.

[0066] The connection hole 142 is for a fastener to pass through. The fastener can specifically be a bolt or the like. During assembly, the battery bottom guard plate can be connected and fixed to the box body of the battery pack by means of the fastener, thus facilitating the assembly.

[0067] Since the protective layer 2 only corresponds to the cell area 15 (not sprayed on the above-mentioned locking area 16), while the protective layer 2 can effectively protect the cells, it also avoids the problem that the setting of the protective layer 2 in the locking area 16 easily causes the attenuation of the bolt torque, ensures the torque of the bolts in the above-mentioned locking area 16, and further ensures the connection strength between the battery bottom guard plate and the tray or the battery pack box body.

[0068] In some embodiments, the ratio of the thickness dimension of the protective layer 2 to the thickness dimension of the second support layer 13 is not greater than 1. Specifically, the thickness dimension of the protective layer 2 is the dimension of the protective layer 2 in the up-down direction, and the thickness dimension of the second support layer 13 is the dimension of the second support layer 13 in the up-down direction. The thickness of the above-mentioned polyurea layer (protective layer 2) / substrate (second support layer 13) ≤ 1. Thus, while ensuring the impact strength of the protective layer 2, the thickness of the polyurea layer can be reduced, which is beneficial to the thinning of the bottom guard plate, and can also reduce the material consumption of the polyurea layer and the cost of arranging the protective layer 2.

[0069] In some embodiments, the bottom plate 1 includes a first flat portion 17 and a second flat portion 18. The second flat portion 18 is provided on the periphery of the first flat portion 17 and is arranged in a staggered manner with the first flat portion 17 in the thickness direction of the bottom plate 1. The protective layer 2 is provided on the first flat portion 17, and the second flat portion 18 is provided with connection holes 142 for connecting to the box body of the battery pack.

[0070] For example, as Figure 4 shown, the first flat portion 17 can be a rectangular plate as a whole, the second flat portion 18 can be a square frame shape, and the second flat portion 18 can be provided on the outer periphery of the first flat portion 17 and extend along the circumferential direction of the first flat portion 17 to close into a circle. In the up-down direction, the first flat portion 17 and the second flat portion 18 can be arranged in a staggered manner, that is, the first flat portion 17 and the second flat portion 18 are not on the same level. The bottom plate 1 can further include a connecting side wall, and the first flat portion 17 and the second flat portion 18 can be connected by the connecting side wall.

[0071] The above-mentioned protective layer 2 can be provided on the bottom side of the first flat portion 17, and a plurality of connection holes 142 can be provided on the second flat portion 18. The plurality of connection holes 142 can be arranged at intervals along the circumferential direction of the second flat portion 18, and the connection holes 142 are for fasteners for connecting the bottom guard plate to the box body of the battery pack to pass through, so as to ensure the relative independence of the design of the fasteners and the protective layer 2, avoid the situation that the protective layer 2 easily causes the attenuation of the fastener torque, and ensure the connection strength of the fasteners. The battery pack of the embodiment of the present invention will be described below.

[0072] The battery pack of the embodiment of the present utility model includes a battery pack bottom protection plate, and the battery pack bottom protection plate can be the battery bottom protection plate described in any of the above embodiments. The battery pack further includes a box body, and the box body includes a tray, etc. The above battery bottom protection plate can be fixed to the bottom side of the tray through fasteners.

[0073] In some embodiments, in the driving direction, the front half of the battery pack (including the front end face, the front half of the side face, the front half of the top face, etc.) can be sprayed with the above-mentioned protective layer 2, so that when the battery pack is impacted by stones or scratched by foreign objects during the forward movement of the whole vehicle, the battery pack can be effectively protected.

[0074] The vehicle of the embodiment of the present utility model will be described below.

[0075] The vehicle of the embodiment of the present utility model includes a battery pack, and the battery pack can be the battery pack described in any of the above embodiments. The vehicle can be a new energy vehicle, specifically, it can be a car, a truck, a bus, a bus, etc.

[0076] For the vehicle of the embodiment of the present utility model, the battery bottom protection plate of the vehicle has advantages such as impact resistance, wear and scratch resistance, anti-abnormal noise, corrosion resistance, etc. In addition, it also has extremely strong advantages in dealing with transient high-impact and blasting, etc., thus fully meeting the use requirements for protecting the bottom side of the battery pack.

[0077] The protective layer sprayed on the battery bottom protection plate of the embodiment of the present utility model can effectively protect the glass fiber layer (which can be regarded as the second support layer) of the bottom plate, and has high after-sales efficiency and low cost.

[0078] For the protective layer spraying of the embodiment of the present utility model, it can be selectively sprayed only in the cell area. While effectively protecting the cells, it can also protect the torque of the bolt locking area, and will not cause bolt torque attenuation due to the increase of the coating layer, ensuring the connection strength between the battery bottom protection plate and the tray, and also reducing the spraying area of the protective layer, which can effectively reduce the cost.

[0079] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present utility model. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present utility model.

Claims

1. A battery bottom guard plate, characterized in that: include: Bottom plate (1); A protective layer (2), the protective layer (2) being arranged on the outer side of the bottom plate (1), the scratch resistance of the protective layer (2) being higher than the scratch resistance of the bottom plate (1).

2. The battery bottom guard plate according to claim 1, characterized in that: The base plate (1) has a battery cell area (15) opposite to the battery cell, and in the thickness direction of the base plate (1), the projection of the battery cell area (15) is located within the range of the projection of the protective layer (2).

3. The battery bottom guard plate according to claim 2, characterized in that: The bottom plate (1) comprises: Metal layer (12); A first supporting layer (11) and a second supporting layer (13), wherein the first supporting layer (11) and the second supporting layer (13) are respectively arranged on both sides of the metal layer (12) in a thickness direction, and the second supporting layer (13) is located between the metal layer (12) and the protective layer (2).

4. The battery bottom guard plate according to claim 3, characterized in that: The base plate (1) comprises a frame (14), wherein the frame (14) is arranged on the outer peripheral side of the metal layer (12), and the frame (14) and the metal layer (12) are both arranged between the first supporting layer (11) and the second supporting layer (13).

5. The battery bottom guard plate according to claim 4, characterized in that: The thickness of the metal layer (12) is consistent with the thickness of the frame (14).

6. The battery bottom guard plate according to claim 4, characterized in that: There are a plurality of the metal layers (12), a plurality of matching holes (141) are provided in the frame (14), and the plurality of the metal layers (12) are respectively embedded in the plurality of matching holes (141).

7. The battery bottom guard plate according to claim 4, characterized in that: The material of the protective layer (2) includes polyurea; And / or, the first supporting layer (11), the second supporting layer (13), and the frame (14) are made of a continuous glass fiber thermoplastic composite material; And / or, the metal layer (12) is a steel plate.

8. The battery bottom guard plate according to claim 4, characterized in that: In the thickness direction of the bottom plate (1), the projection of the metal layer (12) coincides with the projection of the battery core area (15), and the protective layer (2) only covers the surface area of ​​the second supporting layer (13) corresponding to the projection of the metal layer (12).

9. The battery bottom guard plate according to claim 3, characterized in that: The ratio of the thickness of the protective layer (2) to the thickness of the second supporting layer (13) is not greater than 1.

10. The battery bottom guard plate according to any one of claims 1 to 9, characterized in that: The bottom plate (1) comprises a first flat plate portion (17) and a second flat plate portion (18), wherein the second flat plate portion (18) is arranged on the peripheral side of the first flat plate portion (17) and is arranged offset with the first flat plate portion (17) in the thickness direction of the bottom plate (1), the protective layer (2) is arranged on the first flat plate portion (17), and the second flat plate portion (18) is provided with a connection hole (142) for connecting to a box body of a battery pack.

11. A battery pack, characterized in that: It comprises a battery bottom guard plate as described in any one of claims 1 to 10 above.

12. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 11 above.

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