Battery pack bottom protection plate and battery pack

Abstract

The embodiment of the utility model discloses a battery pack bottom protection plate and a battery pack. The battery pack bottom protection plate comprises a bottom protection plate body and a buffer material, a cavity is formed in the bottom protection plate body, at least one through hole communicated with the outside of the bottom protection plate body is formed in the bottom protection plate body, the cavity can be filled with the buffer material through the through hole, and therefore when the battery pack bottom protection plate is subjected to high-strength impact, the buffer material can be prevented from falling off. Energy can be absorbed through the buffer material in the cavity, so that the impact on the battery pack can be effectively relieved, and the battery pack is protected from being damaged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack bottom guard plate and a battery pack. Background Art

[0002] With the rapid development of the new energy vehicle market, the safety performance of the battery pack, as one of the power energy sources of new energy vehicles, directly affects the performance of the entire vehicle and the driving experience. In related technologies, the battery pack is generally arranged at the bottom of the vehicle body, and a bottom guard plate is set at the bottom of the battery pack to absorb the impact energy from the road surface, thereby reducing the direct impact on the battery pack. Usually, the bottom guard plate is made of steel plate, but the energy absorption of steel plate is poor, resulting in the bottom guard plate being unable to effectively absorb energy and protect the battery pack when facing harsh working conditions such as ball hitting or bottoming. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present application provides a battery pack bottom guard plate and a battery pack, aiming to solve the technical problem of poor energy absorption of the bottom guard plate in the prior art.

[0004] To solve the above problems, in a first aspect, the present application provides a battery pack bottom guard plate, which includes:

[0005] A bottom guard plate body, wherein a cavity is formed inside the bottom guard plate body;

[0006] A cushioning material is filled in the cavity;

[0007] Wherein, at least one through hole is provided on the bottom guard plate body, and the cavity is connected with the outside of the bottom guard plate body through the through hole.

[0008] Furthermore, in the battery pack bottom guard plate, the bottom guard plate body comprises:

[0009] First layer board;

[0010] A second layer board, fixedly connected to the first layer board;

[0011] Wherein, the first layer board is stacked on the second layer board, and the cavity is formed between the first layer board and the second layer board.

[0012] Furthermore, in the battery pack bottom guard plate, a surface of the second layer plate close to the first layer plate is recessed to form the cavity.

[0013] Furthermore, in the battery pack bottom guard plate, at least one of the first layer plate and the second layer plate is an aluminum plate.

[0014] Furthermore, in the battery pack bottom guard plate, a plurality of through holes are provided on the bottom guard plate body, and the plurality of through holes include buffer material injection holes and exhaust holes.

[0015] Furthermore, in the battery pack bottom guard plate, the buffer material injection hole and the exhaust hole are located on the same surface of the bottom guard plate body; or / and,

[0016] The diameter of the buffer material injection hole is not less than the diameter of the exhaust hole.

[0017] Furthermore, in the battery pack bottom guard plate, the plurality of buffer material injection holes are respectively close to the four corners of the bottom guard plate body; or / and,

[0018] The plurality of exhaust holes are evenly distributed on the same surface of the bottom guard plate body.

[0019] Furthermore, in the battery pack bottom guard plate, at least two sizes of mounting points are provided on the bottom guard plate body, and the battery pack bottom guard plate is installed on the bottom of the vehicle body through the mounting points.

[0020] Furthermore, in the battery pack bottom guard plate, the buffer material is foamed glue.

[0021] In a second aspect, the present application also provides a battery pack, which includes:

[0022] As described in the first aspect, the battery pack bottom guard plate,

[0023] A battery cell assembly is attached to a surface of the bottom guard plate body.

[0024] The battery pack bottom guard plate provided in the present application includes a bottom guard plate body and a buffer material. A cavity is formed inside the bottom guard plate body, and at least one through hole connected to the outside of the bottom guard plate body is provided on the bottom guard plate body. The buffer material can be filled in the cavity through the through hole, and then when the battery pack bottom guard plate is subjected to a high-intensity impact, energy can be absorbed through the buffer material in the cavity, thereby effectively alleviating the impact on the battery pack and protecting the battery pack from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of the structure of the battery bottom guard plate provided in an embodiment of the present application;

[0027] Figure 2 An exploded view of the battery bottom guard plate provided in an embodiment of the present application;

[0028] Figure 3 A top view of a battery bottom guard plate provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of the partial structure of the battery bottom guard plate provided in an embodiment of the present application;

[0030] Figure 5 A top view of the second layer board provided in an embodiment of the present application;

[0031] Figure 6 A bottom view of the battery bottom guard plate provided in an embodiment of the present application;

[0032] Figure 7 A schematic diagram of the structure of the second layer board provided in an embodiment of the present application.

[0033] Among them, 10 is the bottom guard plate body, 100 is the through hole, 101 is the buffer material injection hole, 102 is the first exhaust hole, 103 is the second exhaust hole, 104 is the rivet hole, 200 is the first layer of plate, 300 is the second layer of plate, 301 is the first groove, 302 is the second groove, 303 is the third groove, 400 is the buffer layer, and 500 is the mounting point. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] It should be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0036] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. that may be mentioned in the description of this application indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] As analyzed in the background technology of this application, the existing battery pack bottom guard plate has a technical problem of poor energy absorption effect. In order to solve the above technical problem, this application provides a battery pack bottom guard plate and a battery pack.

[0038] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of the battery bottom guard plate provided in the embodiment of the present application. Figure 1 As shown, a battery pack bottom guard plate comprises:

[0039] The bottom guard plate body 10 has a cavity formed inside the bottom guard plate body 10;

[0040] A cushioning material is filled in the cavity;

[0041] Among them, at least one through hole 100 is provided on the bottom guard plate body 10 , and the cavity is connected with the outside of the bottom guard plate body 10 through the through hole 100 .

[0042] Specifically, the cavity formed inside the body of the battery bottom guard plate provided by the present application (i.e., the bottom guard plate body 10) can be filled with a buffer material, and the buffer material can be poured in the form of a fluid through the through hole 100 on the bottom guard plate body 10, thereby forming a buffer layer 400 inside the battery pack bottom guard plate. Since the buffer material can absorb impact energy, the battery bottom guard plate can resist high-energy impacts when the thickness is small, and can also effectively buffer under harsh working conditions such as ball hitting and bottoming, protecting the battery pack from damage.

[0043] In the present application, one or more through holes 100 may be provided on the bottom guard plate body 10, and at least one through hole 100 is connected to the cavity formed inside the bottom guard plate body 10, so that the buffer material can be easily poured into the cavity in the form of a fluid. At the same time, the through hole 100 may be located on the upper surface of the bottom guard plate body 10, or on the lower surface of the bottom guard plate body 10, or on the side of the bottom guard plate body 10. It can be understood that the present application only requires the presence of a through hole 100 on the bottom guard plate body 10 that allows the cavity to communicate with the outside world, and the position of the through hole 100 on the bottom guard plate body 10 can be selected according to actual conditions, and the present application does not make specific restrictions.

[0044] Meanwhile, the cushioning material described in the present application may be foam glue, which is a kind of glue with foaming and bonding properties, and includes polyurethane prepolymer, foaming agent, catalyst, cross-linking agent, etc. When the foam glue is sprayed out from the aerosol can, the foamy polyurethane material will expand rapidly and react with the air or moisture in the contacted matrix to form foam, and then a cushioning layer 400 may be formed in the cavity inside the bottom guard plate body 10. It should be noted that other cushioning materials may also be selected without departing from the principle of the present utility model, as long as they can automatically rebound, absorb large amounts of energy, are lightweight, and can be poured into the cavity through the through hole 100.

[0045] The battery pack bottom guard plate provided in the present application includes a bottom guard plate body 10 and a buffer material. A cavity is formed inside the bottom guard plate body 10, and at least one through hole 100 connected to the outside of the bottom guard plate body 10 is provided on the bottom guard plate body 10. The buffer material can be filled in the cavity through the through hole 100, and then when the battery pack bottom guard plate is subjected to a high-intensity impact, energy can be absorbed through the buffer material in the cavity, thereby effectively alleviating the impact on the battery pack and protecting the battery pack from damage.

[0046] In some embodiments, Figure 2 As shown, the bottom guard plate body 10 includes:

[0047] First layer board 200;

[0048] The second layer board 300 is fixedly connected to the first layer board 200;

[0049] The first layer board 200 is stacked on the second layer board 300 , and a cavity is formed between the first layer board 200 and the second layer board 300 .

[0050] In this embodiment, both the first layer plate 200 and the second layer plate 300 can be metal layer plates, and the bottom guard plate body 10 can be formed by stacking and fixing two layers (the first layer plate 200 and the second layer plate 300). After the first layer plate 200 is stacked on the second layer plate 300, a gap needs to be left between the first layer plate 200 and the second layer plate 300. After the gap is sealed, a cavity inside the bottom guard plate body 10 can be formed. Among them, the surface of the first layer plate 200 away from the second layer plate 300 can be used as the upper surface of the battery panel bottom guard plate and can carry the battery pack, and the surface of the second layer plate 300 away from the first layer plate 200 can be used as the lower surface of the battery pack bottom guard plate. At the same time, the through hole 100 can be provided on the surface of the first layer plate 200 away from the second layer plate 300, and can also be provided on the surface of the second layer plate 300 away from the first layer plate 200.

[0051] In some embodiments, Figure 5 and Figure 7 As shown, a surface of the second layer plate 300 close to the first layer plate 200 is recessed to form a cavity inside the bottom guard plate body 10 .

[0052] In this embodiment, in order to ensure that the buffer material is poured into the cavity in the form of a fluid and a buffer layer 400 is formed in the cavity, the present application can recess a surface of the second layer plate 300 close to the first layer plate 200 (i.e., the upper surface of the second layer plate 300) to form a first groove 301 on the second layer plate 300. After the first layer plate 200 is stacked on the second layer plate 300, the first groove 301 can be used as the cavity inside the bottom guard plate body 10. At the same time, a through hole 100 can be set on the first layer plate 200, and then after the first layer plate 200 is stacked on the second layer plate 300, the cavity can be connected to the outside through the through hole 100 to facilitate the pouring of the buffer material. Among them, the second layer plate 300 can be formed by stamping in one piece, and the first groove 301 is formed on the upper surface of the second layer plate 300. A certain width needs to be reserved between the side of the first groove 301 and the adjacent side of the second layer board 300 so that the first layer board 200 can be fixed at this position after being stacked on the second layer board 300 .

[0053] It should be noted that the present application can also make a depression on a surface of the first layer 200 close to the second layer 300 to form a cavity, and at the same time set a through hole 100 on the second layer 300, which can also realize the injection of buffer material.

[0054] In some embodiments, at least one of the first layer plate 200 and the second layer plate 300 is an aluminum plate.

[0055] Specifically, the existing designs of battery pack bottom guard plates generally use steel plates as battery pack bottom guard plates. The steel plates need to be electrophoresed first to meet the requirements of the 720 salt spray test for the battery pack bottom guard plates. After the electrophoresis is completed, it is also necessary to spray insulating material on the surface of the steel plate to form a PVC coating on the surface of the steel plate to meet the bottom ball impact standard of the battery pack bottom guard plate. However, during the use of the battery pack bottom guard plate made of steel plates, over time, there is a risk of corrosion and rust on the surface of the battery pack bottom guard plate. At the same time, since the thickness of the steel plate is generally 1.0 thickness, the strength of the battery pack bottom guard plate is relatively weak, resulting in the battery pack bottom guard plate being prone to failure when subjected to a strong bottom ball impact.

[0056] To this end, the battery pack bottom guard plate provided in the present application is stacked with two metal layers, which increases the thickness of the battery pack bottom guard plate, can improve the strength of the battery pack bottom guard plate, and can also meet the requirements of the bottom support test of the battery pack bottom guard plate. At the same time, at least one of the metal layers is an aluminum plate, which can eliminate the need for electrophoresis and spraying on the aluminum plate, reducing the risk of salt spray failure of the battery pack bottom guard plate, and a buffer layer 400 is provided between the two metal layers, so that when the battery pack bottom guard plate is subjected to a high-intensity impact, the battery pack can be effectively relieved from the impact and protected from damage. Preferably, both the first layer 200 and the second layer 300 are aluminum plates, which not only increases the strength of the battery pack bottom guard plate, but also reduces the weight of the battery pack bottom guard plate, while also reducing the risk of salt spray failure of the product, and meeting the requirements of the bottom ball impact and bottom support test.

[0057] In some embodiments, the first layer plate 200 and the second layer plate 300 are riveted and fixed using rivets.

[0058] Specifically, Figure 3 As shown, the present application can set a plurality of rivet holes 104 at the edge positions of the first layer plate 200 and the second layer plate 300. When the first layer plate 200 and the second layer plate 300 are riveted and fixed by rivets, the first layer plate 200 and the second layer plate 300 can be fixed by rivets on the plurality of rivet holes 104 set at the edge positions of the first layer plate 200 and the second layer plate 300. The rivet holes 104 are evenly distributed at the edge positions of the first layer plate 200 and the second layer plate 300, so that after the buffer material is poured into the inner cavity of the bottom guard plate body 10 in the form of a fluid, the overflow of the buffer material can be avoided. In addition, the rivets can be core-pulling rivets, and the number of rivets on the bottom guard plate of the battery pack can be 92.

[0059] In some embodiments, Figure 3 and Figure 4 As shown, a plurality of through holes 100 are provided on the bottom guard plate, and the plurality of through holes 100 include a plurality of buffer material injection holes 101 and a plurality of exhaust holes.

[0060] In this embodiment, four buffer material pouring holes 101 are evenly distributed on the bottom guard plate body 10, and are respectively close to a corner of the bottom guard plate body 10. When the buffer material is poured into the bottom guard plate body 10, the buffer material can be evenly distributed in the cavity inside the bottom guard plate body 10 to form a buffer layer 400. At the same time, the four buffer material pouring holes 101 can be located on the first layer board 200. The four buffer material pouring holes 101 can be connected to form a rectangle, which can be regarded as the shape of the first layer board 200 reduced in a certain proportion.

[0061] At the same time, twelve exhaust holes are also evenly distributed on the bottom guard plate body 10 , which can play a role in exhaust when the bottom guard plate body 10 is poured with buffer material, so that the buffer material can be evenly distributed in the cavity inside the bottom guard plate body 10 to form a buffer layer 400 .

[0062] It should be noted that the diameters of the twelve exhaust holes may be the same or different. Preferably, the twelve exhaust holes provided in the present application are divided into two types of exhaust holes of different diameters, namely, the first exhaust hole 102 and the second exhaust hole 103, wherein the exhaust holes with larger diameters are the first exhaust holes 102, of which there are four, and the exhaust holes with smaller diameters are the second exhaust holes 103, of which there are eight. The eight exhaust holes with smaller diameters are close to their respective corresponding buffer material pouring holes 101, and the four exhaust holes with smaller diameters are far away from their respective corresponding buffer material pouring holes 101. At the same time, the four exhaust holes with smaller diameters are respectively distributed at the four corners of the bottom guard plate body 10. The above-mentioned design method can not only achieve the effect of uniform exhaust, but also prevent excessive buffer material from overflowing from the exhaust holes during the process of pouring buffer material into the bottom guard plate body 10.

[0063] In some embodiments, Figure 3 and Figure 4 As shown, the buffer material injection hole 101 and the exhaust hole are located on the same surface of the bottom guard plate body 10.

[0064] Specifically, in order to prevent excessive overflow of buffering material from the exhaust holes during the process of pouring the buffering material into the guard plate body, and to speed up the pouring of the buffering material, the present application preferably locates the buffering material pouring hole 101 and the exhaust hole on the same surface of the bottom guard plate body 10, that is, the buffering material pouring hole 101 and the exhaust hole are both located on the first layer of the plate 200.

[0065] In some embodiments, Figure 3 and Figure 4 As shown, the diameter of the buffer material pouring hole 101 is not less than the diameter of the exhaust hole.

[0066] In this embodiment, the diameter of the buffer material injection hole 101 can be larger than the diameter of the exhaust hole, and the number of the buffer material injection holes 101 can be smaller than the number of the exhaust holes, thereby accelerating the exhaust while increasing the injection of the buffer material, thereby improving the injection efficiency of the buffer material.

[0067] It should be noted that the number and diameter of the buffer material injection holes 101 and the exhaust holes can be selected according to actual applications, and this application does not make any specific restrictions.

[0068] In some embodiments, Figure 4 and Figure 6 As shown, at least two sizes of mounting points 500 are provided on the bottom guard plate body 10 , and the battery pack bottom guard plate is installed on the bottom of the vehicle body through the mounting points 500 .

[0069] Specifically, the mounting point 500 is a fixing point where the battery pack bottom guard plate is installed on the bottom of the vehicle body, and the position of the mounting point 500 can be designed according to the installation position of the battery pack bottom guard plate on the bottom of the vehicle body of the electric vehicle.

[0070] At the same time, a plurality of mounting points 500 may be provided on the bottom guard plate body 10, and the plurality of mounting points 500 are divided into mounting points 500 of two sizes, and both mounting points 500 of two sizes may be formed by a surface depression of the second layer plate 300 away from the first layer plate 200, that is, after a surface depression of the second layer plate 300 away from the first layer plate 200 to form a plurality of second grooves 302 and a plurality of third grooves 303, the plurality of second grooves 302 may be used as mounting points 500 of one size, and the plurality of third grooves 303 may be used as mounting points 500 of another size. For example, a surface depression of the second layer plate 300 away from the first layer plate 200 to form two second grooves 302 and three third grooves 303, the two second grooves 302 are respectively located on the left and right sides of the surface, and the three third grooves 303 are distributed in the middle of the surface, and are arranged in sequence from top to bottom. Among them, the second groove 302 and the third groove 303 can both be fitted with the first layer of board 200. In order to prevent the buffer material from overflowing from the mounting point 500 during pouring, a plurality of rivet holes 104 can be evenly arranged in the second groove 302 and the third groove 303, and the third groove 303 can be tightly fitted with the first layer of board 200 through rivets.

[0071] The following is a specific example to describe the assembly process of the battery pack bottom guard plate provided by the present application:

[0072] S1. Use plasma to clean the bonding surface of the second layer board 300 (AL5083-O aluminum plate), and place it on a special tooling after it meets the requirements of the 40# dyne pen test;

[0073] S2, using plasma to clean the bonding surface of the first layer board 200 (AL5083-O aluminum plate), after meeting the 40# dyne pen test requirements, stacking it on the second layer board 300;

[0074] S3, using blind rivets to rivet the first layer plate 200 and the second layer plate 300, the number of the blind rivets being 92;

[0075] S4, pressing the first layer board 200 and the second layer board 300 after riveting and fixing, and then moving them to the position of the glue dispenser to inject foam glue;

[0076] S5. After the foam glue is poured, place it at room temperature for about 30 minutes, then disassemble the tooling, scrape off the foam glue overflowing from the exhaust hole, and then you can get the battery pack bottom guard plate of the present application.

[0077] In some embodiments, the present application also provides a battery pack, which includes: the battery pack bottom guard plate and battery cell assembly mentioned in the above embodiments; wherein the lower surface of the battery cell assembly is attached to the upper surface of the bottom guard plate body 10.

[0078] In this embodiment, the battery pack includes a battery pack bottom protective plate and a battery cell assembly, wherein the lower surface of the battery cell assembly is aligned with the upper surface of the battery pack bottom protective plate, and the battery pack bottom protective plate is specifically used to protect the bottom of the battery pack.

[0079] In some embodiments, the present application also provides an electric vehicle, which includes: a vehicle body and the battery pack mentioned above; wherein the battery pack is arranged on the vehicle body.

[0080] Specifically, the battery pack provided in the present application can be applied to electric vehicles. The battery pack can also be applied to other means of transportation or other charging and discharging equipment, such as mobile power supply stations, electric yachts, etc.

[0081] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A battery pack bottom guard plate, characterized in that: include: A bottom guard plate body, wherein a cavity is formed inside the bottom guard plate body; A cushioning material is filled in the cavity; Wherein, at least one through hole is provided on the bottom guard plate body, and the cavity is connected with the outside of the bottom guard plate body through the through hole.

2. The battery pack bottom guard plate according to claim 1, characterized in that: The bottom guard plate body comprises: First layer board; A second layer board, fixedly connected to the first layer board; Wherein, the first layer board is stacked on the second layer board, and the cavity is formed between the first layer board and the second layer board.

3. The battery pack bottom guard plate according to claim 2, characterized in that: A surface of the second layer plate close to the first layer plate is recessed to form the cavity.

4. The battery pack bottom guard plate according to claim 2, characterized in that: At least one of the first layer plate and the second layer plate is an aluminum plate.

5. The battery pack bottom guard plate according to any one of claims 1 to 4, characterized in that: The bottom guard plate body is provided with a plurality of through holes, and the plurality of through holes include buffer material injection holes and exhaust holes.

6. The battery pack bottom guard plate according to claim 5, characterized in that: The buffer material injection hole and the exhaust hole are located on the same surface of the bottom guard plate body; or / and, The diameter of the buffer material injection hole is not less than the diameter of the exhaust hole.

7. The battery pack bottom guard plate according to claim 5, characterized in that: The plurality of cushioning material injection holes are respectively close to the four corners of the bottom guard plate body; or / and, The plurality of exhaust holes are evenly distributed on the same surface of the bottom guard plate body.

8. The battery pack bottom guard plate according to any one of claims 1 to 4, characterized in that: The bottom guard plate body is provided with at least two sizes of mounting points, and the battery pack bottom guard plate is installed on the bottom of the vehicle body through the mounting points.

9. The battery pack bottom guard plate according to any one of claims 1 to 4, characterized in that: The cushioning material is foamed rubber.

10. A battery pack, characterized in that: include: The battery pack bottom guard plate according to any one of claims 1 to 9, A battery cell assembly is attached to a surface of the bottom guard plate body.

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