Bottom protection plate, battery and electric device

Abstract

The utility model discloses a bottom protection plate, a battery and an electric device. The bottom protection plate is used for the battery and comprises an insulating plate, a metal plate and a composite plate, and the insulating plate, the metal plate and the composite plate are sequentially connected in a stacked mode in the thickness direction of the bottom protection plate. According to the bottom protection plate, on one hand, the side, provided with the insulating plate, of the bottom protection plate can be close to the side of the single battery to prevent the single battery from being connected with the metal plate, and on the other hand, the composite plate is arranged on the metal plate, so that the thickness of the metal plate can be reduced under the condition that the bottom protection plate has certain rigidity. The weight of the metal plate accounts for a high proportion of the weight of the bottom protective plate, so that the weight of the bottom protective plate can be reduced by reducing the thickness of the metal plate.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a bottom guard plate, a battery and an electrical device. Background Art

[0002] With the increasing development of new energy vehicles, the requirements for passive protection of batteries are becoming higher and higher, especially the requirements for bottom protection. For bottom protection assessment, relevant tests are gradually transformed into strong inspection tests, including but not limited to bottom ball hitting and vehicle bottom scraping, which poses a great challenge to the passive protection of inverted batteries.

[0003] In the related art, the bottom guard plate of the inverted battery generally adopts a large flat steel plate + PVC coating technology. However, the thickness of the large flat steel plate is large, resulting in a large weight of the bottom guard plate. Utility Model Content

[0004] In view of the above problems, the present application provides a bottom guard plate, a battery and an electrical device, which can reduce the weight of the bottom guard plate while ensuring that the bottom guard plate has a certain rigidity.

[0005] In a first aspect, the present application provides a bottom guard plate, which is used for a battery. The bottom guard plate includes an insulating plate, a metal plate and a composite plate. Along the thickness direction of the bottom guard plate, the insulating plate, the metal plate and the composite plate are stacked and connected in sequence.

[0006] In the technical solution of the embodiment of the present application, the bottom guard plate can be used as the bottom guard plate of the battery housing. Along the thickness direction of the bottom guard plate, the insulating plate, the metal plate and the composite plate are sequentially stacked and connected. On the one hand, the side of the bottom guard plate where the insulating plate is arranged can be the side close to the battery cell to prevent the battery cell from connecting with the metal plate. On the other hand, the composite plate is arranged on the metal plate to reduce the thickness of the metal plate while ensuring that the bottom guard plate has a certain rigidity. Since the weight of the metal plate accounts for a high proportion of the weight of the bottom guard plate, the reduction in the thickness of the metal plate can reduce the weight of the bottom guard plate.

[0007] In some embodiments, the metal plate is provided with a plurality of reinforcing ribs, the plurality of reinforcing ribs are arranged at intervals along a first direction, the reinforcing ribs extend along a second direction, and the first direction is perpendicular to the second direction.

[0008] By arranging a plurality of reinforcing ribs on the metal plate and the reinforcing ribs extending along the second direction, the rigidity of the metal plate along the second direction can be increased, thereby reducing or avoiding deformation of the bottom guard plate when impacted by external obstacles.

[0009] In some embodiments, the bottom guard plate includes a surrounding plate, the surrounding plate is connected to the periphery of the metal plate, the surrounding plate and the metal plate form a receiving cavity, and the insulating plate is located in the receiving cavity.

[0010] The accommodating cavity allows the bottom guard plate to be positioned to a certain extent when it is installed in the box body. Specifically, a part of the battery cell located outside the accommodating cavity can be accommodated in the accommodating cavity to position the bottom guard plate, thereby facilitating the installation of the bottom guard plate and improving assembly efficiency.

[0011] In some embodiments, the bottom guard plate includes a flange edge, the flange edge is connected to the edge of the enclosure away from the metal plate, and the flange edge is provided with a mounting hole.

[0012] By providing the flange edge, the bottom guard plate can be assembled with the box body, and the fasteners can pass through the mounting holes and be connected with the box body, thereby achieving a fixed connection between the bottom guard plate and the box body.

[0013] In some embodiments, a first air barrier is formed between the insulating plate and the metal plate, and / or a second air barrier is formed between the composite plate and the metal plate.

[0014] Improved the thermal insulation performance of the battery.

[0015] In some embodiments, the metal plate includes a first surface and a second surface along a thickness direction, the first surface is provided with a first recess, the insulating plate is connected to the first surface and covers the first recess to form the first air barrier, and / or;

[0016] The second surface is provided with a second recess, and the composite board is connected to the second surface and covers the second recess to form the second air barrier.

[0017] By setting a depression on the metal plate and cooperating with an insulating plate and a composite plate, during the assembly of the bottom guard plate, the insulating plate is connected to the first surface of the metal plate so that the first depression can form a first air barrier, and the composite plate is connected to the second surface of the metal plate so that the second depression can form a second air barrier. The air barrier is formed in a simple and efficient manner.

[0018] In some embodiments, a plurality of the first air barriers and a plurality of the second air barriers are alternately arranged along the first direction.

[0019] At the first air barrier, the metal plate is spaced apart from the insulating plate, and the second surface of the metal plate is connected to the composite plate. At the second air barrier, the metal plate is spaced apart from the composite plate, and the first surface of the metal plate is connected to the insulating plate. Therefore, along the front-to-back direction, the connection between the metal plate and the insulating plate and the connection between the metal plate and the composite plate are alternately arranged, so that the plurality of first air barriers and the plurality of second air barriers are alternately arranged along the front-to-back direction. In addition, when the plurality of first air barriers and the plurality of second air barriers are formed, the rigidity of the bottom guard plate can be ensured.

[0020] In some embodiments, the insulating plate is connected to the metal plate by a sealant, and the composite plate is connected to the metal plate by a structural sealant.

[0021] The insulation board and metal board are connected by sealant to ensure the sealing performance. The metal board and composite board are connected by structural sealant to ensure the sealing performance and bonding strength.

[0022] In a second aspect, an embodiment of the present application provides a battery, which includes the bottom guard plate in the above embodiment.

[0023] In some embodiments, the battery includes a battery cell and a case, the case is provided with a accommodating cavity, the accommodating cavity has an opening formed on a side of the case along a third direction, the bottom guard plate is connected to the case and covers the opening, the battery cell is fixed in the accommodating cavity, the battery cell includes a pole, the pole faces the insulating plate and is spaced apart from the insulating plate.

[0024] The pole is spaced from the insulating plate. On the one hand, it can provide space for related components (such as busbar components, low-voltage sampling plates, etc.) to connect to the pole. On the other hand, it can prevent the pole from hitting the insulating plate and causing damage to the pole and insulating parts.

[0025] In some embodiments, the battery includes a support bracket, the battery cell includes a second shell, the pole is provided on a side of the second shell along a third direction, and the support bracket separates the second shell and the insulating plate.

[0026] The support bracket separates the second shell and the insulating plate, so that the pole can be separated from the insulating plate.

[0027] In some embodiments, the supporting bracket and the insulating plate are connected via a buffer layer.

[0028] The buffer layer can buffer external impact force, reduce the external impact force transmitted from the insulating plate to the supporting bracket, and further reduce the external impact force transmitted to the battery cell, thereby protecting the battery cell.

[0029] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0032] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0033] Figure 2 A schematic diagram of the structure of a battery in some embodiments of the present application;

[0034] Figure 3 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0035] Figure 4 A top view of a battery according to some embodiments of the present application;

[0036] Figure 5 for Figure 4 A schematic cross-sectional view of a battery along line AA;

[0037] Figure 6 for Figure 5 An enlarged schematic diagram of part B of a battery;

[0038] Figure 7 This is a schematic diagram of the exploded structure of the bottom guard plate of some embodiments of the present application;

[0039] Figure 8 A top view of a bottom guard plate of some embodiments of the present application;

[0040] Fig. 9 for Figure 8 A schematic cross-sectional view of the bottom guard plate along the CC line;

[0041] Fig.10 for Fig. 9 An enlarged schematic diagram of the bottom guard plate D portion;

[0042] Fig.11 for Fig. 9 An enlarged schematic diagram of the bottom guard plate E portion;

[0043] Fig.12 This is a schematic diagram of the structure of the support bracket, buffer layer, double-sided tape and structural adhesive of some embodiments of the present application.

[0044] The reference numerals in the specific implementation manner are as follows:

[0045] Vehicles 1000;

[0046] Battery 100, controller 200, motor 300;

[0047] A first housing 10;

[0048] Battery cell 20, pole 201, second shell 202;

[0049] Box body 30, accommodating cavity 301, opening 302, fastener 303;

[0050] Bottom guard plate 40, insulating plate 401, metal plate 402, composite plate 403, reinforcing rib 404, enclosure 405, accommodating cavity 406, flange edge 407, mounting hole 408, first air barrier 409, second air barrier 410, first surface 411, second surface 412, first recess 413, second recess 414, sealant 415, structural sealant 416;

[0051] Sealing ring 50;

[0052] Support bracket 60;

[0053] Buffer layer 70;

[0054] Double-sided tape 80;

[0055] Structural adhesive 90. DETAILED DESCRIPTION

[0056] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0058] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0059] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0060] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0061] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0062] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0063] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0064] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0065] The inventor of this application has noticed that the passive protection requirements for power batteries are getting higher and higher, especially the bottom protection requirements. For the bottom protection assessment, the relevant tests are gradually transformed into strong inspection tests, including but not limited to bottom ball hitting and vehicle bottom scraping, which is a great challenge for the passive protection of inverted batteries. In the current market, inverted batteries are not widely used. The bottom guard plate of inverted batteries generally adopts large flat steel plate + PVC coating technology. However, the large flat steel plate is thick, which makes the bottom guard plate heavier.

[0066] Based on the above considerations, in order to solve the problem of the heavy weight of the bottom guard plate, the inventor of the present application has designed a bottom guard plate after in-depth research. The bottom guard plate includes an insulating plate, a metal plate and a composite plate. Along the thickness direction of the bottom guard plate, the insulating plate, the metal plate and the composite plate are stacked and connected in sequence.

[0067] In such a bottom guard plate, the bottom guard plate can be used as the bottom guard plate of the battery housing. Along the thickness direction of the bottom guard plate, the insulating plate, the metal plate and the composite plate are sequentially stacked and connected. On the one hand, the side of the bottom guard plate where the insulating plate is arranged can be the side close to the battery cell to prevent the battery cell from connecting with the metal plate. On the other hand, the composite plate is arranged on the metal plate to reduce the thickness of the metal plate while ensuring that the bottom guard plate has a certain rigidity. Since the weight of the metal plate accounts for a high proportion of the weight of the bottom guard plate, the reduction in the thickness of the metal plate can reduce the weight of the bottom guard plate.

[0068] The bottom guard plate disclosed in the embodiment of the present application can be applied to batteries, and the batteries can be applied to electrical devices as power sources or various energy storage systems using batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0069] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0070] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0071] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0072] Please refer to Figure 2 and Figure 3 , Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application, Figure 3 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a first shell 10 and a battery cell 20, and the battery cell 20 is accommodated in the first shell 10. Among them, the first shell 10 is used to provide a storage space for the battery cell 20, and the first shell 10 can adopt a variety of structures. In some embodiments, the first shell 10 may include a box body 30 and a bottom guard plate 40, and the box body 30 and the bottom guard plate 40 cover each other, and the box body 30 and the bottom guard plate 40 jointly define a storage space for accommodating the battery cell 20. The box body 30 can be a hollow structure with one end open, and the bottom guard plate 40 can be a plate-shaped structure, and the bottom guard plate 40 covers the open side of the box body 30, so that the bottom guard plate 40 and the box body 30 jointly define a storage space; the bottom guard plate 40 and the box body 30 can also be hollow structures with one side open, and the open side of the bottom guard plate 40 covers the open side of the box body 30. Of course, the shell formed by the bottom guard plate 40 and the box body 30 can be in various shapes, such as a cylinder, a cuboid, etc.

[0073] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the first shell 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the first shell 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0074] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0075] According to some embodiments of this application, please refer to Figures 3 to 10 An embodiment of the present application provides a bottom guard plate 40 for a battery 100. The bottom guard plate 40 includes an insulating plate 401, a metal plate 402 and a composite plate 403. Along the thickness direction of the bottom guard plate 40, the insulating plate 401, the metal plate 402 and the composite plate 403 are stacked and connected in sequence.

[0076] As shown in the figure, Figure 2 and Figure 3 The front-to-back direction may be the length direction of the bottom guard plate 40 , the left-to-right direction may be the width direction of the bottom guard plate 40 , and the up-down direction may be the thickness direction of the bottom guard plate 40 .

[0077] Optionally, the bottom guard plate 40 is roughly rectangular in shape as a whole. When the bottom guard plate 40 is applied to the battery 100, the insulating plate 401 faces the battery cell 20, and the battery cell 20 is separated from the metal plate 402, so as to avoid the battery cell 20 being connected to the metal plate 402 and causing a short circuit in the battery cell 20, thereby forming good insulation protection.

[0078] The present application does not specifically limit the material and thickness of the insulating plate 401. In some examples, the material of the insulating plate 401 may be polycarbonate (PC) or hard rubber. Optionally, the thickness of the insulating plate 401 is selected from the range [0.5 mm, 1 mm]. mm means millimeter.

[0079] The present application does not specifically limit the material and thickness of the metal plate 402. In some examples, the metal plate 402 can be stamped from a steel plate, and the thickness of the steel plate can be selected from the range of [1 mm, 1.5 mm].

[0080] The present application does not specifically limit the material and thickness of the composite plate 403. In one example, the material of the composite plate 403 can be polybutylene terephthalate (PBT) or carbon fiber. The thickness of the composite plate 403 can be selected from the range [1 mm, 1.5 mm].

[0081] The battery 100 used by the bottom guard plate 40 may be an inverted battery 100, and the battery 100 includes a case body 30, a bottom guard plate 40 and a battery cell 20. The case body 30 is provided with a accommodating cavity 301, and the accommodating cavity 301 is formed with an opening 302 on a side surface of the case body 30 along a third direction. The bottom guard plate 40 is connected to the case body 30 and covers the opening 302. The battery cell 20 is fixed in the accommodating cavity 301, and the battery cell 20 includes a pole 201, and the pole 201 faces the insulating plate 401 and is spaced from the insulating plate 401.

[0082] One or more battery cells 20 may be disposed in the accommodation cavity 301. Figure 3 In the embodiment, a plurality of battery cells 20 are arranged in the accommodating cavity 301, and the plurality of battery cells 20 are arranged along the first direction and the second direction. The plurality of battery cells 20 can be electrically connected in series, in parallel or in a mixed manner. Optionally, the battery cells 20 can be glued to the box body 30 by means of structural adhesive. Figure 3 In the embodiment, the first direction is the front-to-back direction, the second direction is the left-to-right direction, and the third direction is the up-down direction.

[0083] Please combine Figures 4 to 6 When the inverted battery 100 is installed in the vehicle 1000, the pole 201 of the battery cell 20 faces downward, the composite plate 403 of the bottom guard plate 40 faces the ground, and the insulating plate 401 faces the accommodation space. It can be understood that the bottom guard plate 40 is not limited to being used in the inverted battery 100, but can also be used in the upright battery 100. When the upright battery 100 is installed in the vehicle 1000, the pole 201 of the battery cell 20 faces upward, the composite plate 403 of the bottom guard plate 40 faces the ground, and the insulating plate 401 faces the accommodation space.

[0084] In summary, by forming a three-layer sandwich structure, the bottom guard plate 40 is composed of an insulating plate 401, a metal plate 402 and a composite plate 403 along the thickness direction. On the one hand, the thickness of the metal plate 402 can be reduced and the weight of the bottom guard plate 40 can be reduced. On the other hand, the insulating plate 401 can also provide good insulation protection for the battery cell 20.

[0085] According to some embodiments of the present application, optionally, the metal plate 402 is provided with a plurality of reinforcing ribs 404 , the plurality of reinforcing ribs 404 are arranged at intervals along a first direction, the reinforcing ribs 404 extend along a second direction, and the first direction is perpendicular to the second direction.

[0086] When the battery 100 with the bottom guard plate 40 is installed on the vehicle 1000, the bottom guard plate 40 is easily hit by external obstacles (such as ground stone foundation, gravel, etc.). By providing a plurality of reinforcing ribs 404 on the metal plate 402, and the reinforcing ribs 404 extend along the second direction, the rigidity of the metal plate 402 along the second direction can be increased, and the deformation of the bottom guard plate 40 when hit by external obstacles can be reduced or avoided.

[0087] In one embodiment, please combine Figure 7 The second direction is the left-right direction, which may refer to the left-right direction of the vehicle 1000 (i.e., the lateral direction of the vehicle 1000), and the first direction is the front-back direction, which may refer to the front-back direction of the vehicle 1000 (i.e., the longitudinal direction of the vehicle 1000). That is, the reinforcing ribs 404 extend in the lateral direction to increase the lateral rigidity of the metal plate 402. The plurality of reinforcing ribs 404 are arranged at intervals in the longitudinal direction.

[0088] It can be understood that in other embodiments, the second direction may refer to the front-to-back direction of the vehicle 1000 (i.e., the longitudinal direction of the vehicle 1000), the first direction may refer to the left-to-right direction of the vehicle 1000 (i.e., the lateral direction of the vehicle 1000), and the second direction and the first direction may also be other directions, which are not specifically limited here.

[0089] Optionally, the reinforcing ribs 404 may be formed by stamping the metal plate 402 . Compared with providing additional reinforcing ribs 404 on the metal plate 402 , the reinforcing ribs 404 formed by stamping have a simple structure, low cost and high production efficiency.

[0090] According to some embodiments of the present application, optionally, please refer to Figures 8 to 10 The bottom guard plate 40 includes a surrounding plate 405 , which is connected to the periphery of the metal plate 402 . The surrounding plate 405 and the metal plate 402 form a receiving cavity 406 , and the insulating plate 401 is located in the receiving cavity 406 .

[0091] The accommodating cavity 406 can accommodate a part of the battery cell 20, and the other part of the battery cell 20 can be accommodated in the accommodating cavity 301. When the battery 100 is assembled, the opening 302 of the accommodating cavity 301 of the box body 30 faces upward, and the battery cell 20 is loaded into the accommodating cavity 301 with the pole 201 of the battery cell 20 facing upward, and fixed by structural adhesive. Then, the bottom guard plate 40 is installed on the box body 30 from top to bottom in a manner that the accommodating cavity 406 faces the accommodating cavity 301, so that the bottom guard plate 40 covers the opening 302 of the accommodating cavity 301. Then, the bottom guard plate 40 and the box body 30 can be fixed by bolts to form a first shell 10 for accommodating the battery cell 20, so that the battery cell 20 is accommodated in the accommodating space formed by the accommodating cavity 301 and the accommodating cavity 406. Furthermore, a sealing ring 50 may be provided between the bottom guard plate 40 and the box body 30 , and the sealing ring 50 seals and connects the bottom guard plate 40 and the box body 30 , so that the accommodation space jointly formed by the accommodation cavity 301 and the accommodation cavity 406 is a relatively closed accommodation space.

[0092] After assembly, the battery 100 can be installed upside down on the vehicle 1000, with the poles 201 of the battery cells 20 facing downward and the bottom guard plate 40 facing the ground.

[0093] The accommodating cavity 406 allows the bottom guard plate 40 to be positioned to a certain extent when it is installed in the box body 30. Specifically, a portion of the battery cell 20 located outside the accommodating cavity 301 can be accommodated in the accommodating cavity 406 to position the bottom guard plate 40, thereby facilitating the installation of the bottom guard plate 40 and improving assembly efficiency.

[0094] According to some embodiments of the present application, optionally, please refer to Figures 8 to 10 The bottom guard plate 40 includes a flange edge 407 , which is connected to the edge of the enclosure 405 away from the metal plate 402 , and the flange edge 407 is provided with a mounting hole 408 .

[0095] exist Figure 7 In the embodiment, the flange edge 407 is connected to the front, rear, left, and right edges of the enclosure 405 and extends in a direction away from the enclosure 405, so that the bottom guard plate 40 can be connected to the box body 30 from the front, rear, left, and right directions. The mounting holes 408 of the flange edge 407 can be passed through by fasteners 303 (such as bolts), and the fasteners 303 pass through the mounting holes 408 to connect to the box body 30, thereby locking the box body 30 and the bottom guard plate 40.

[0096] By providing the flange edge 407 , the bottom guard plate 40 can be assembled with the box body 30 , and the fastener 303 can penetrate the mounting hole 408 to be connected with the box body 30 , thereby achieving a fixed connection between the bottom guard plate 40 and the box body 30 .

[0097] Optionally, the flange 407, the enclosure 405 and the metal plate 402 are connected to form an integral structure. The flange 407, the enclosure 405 and the metal plate 402 can be formed by stamping and bending a plate.

[0098] According to some embodiments of the present application, optionally, a first air barrier 409 is formed between the insulating plate 401 and the metal plate 402 , and a second air barrier 410 is formed between the composite plate 403 and the metal plate 402 .

[0099] The first air barrier 409 can reduce the contact area between the insulating plate 401 and the metal plate 402, thereby reducing the heat transfer area between the insulating plate 401 and the metal plate 402. Since the insulating plate 401 is facing the accommodation space, the heat transferred from the inside of the battery 100 to the metal plate 402 through the insulating plate 401 can be reduced, thereby improving the thermal insulation performance of the battery 100.

[0100] The second air barrier 410 can reduce the contact area between the metal plate 402 and the composite plate 403, thereby reducing the heat transfer area between the metal plate 402 and the composite plate 403. Since the composite plate 403 is located at the outermost layer of the battery 100, the heat transferred from the inside of the battery 100 to the composite plate 403 through the metal plate 402 can be reduced, thereby improving the thermal insulation performance of the battery 100.

[0101] In summary, the first air barrier 409 reduces the heat transfer from the insulating plate 401 to the metal plate 402 inside the battery 100, and the second air barrier 410 reduces the heat transfer from the metal plate 402 to the composite plate 403, which greatly improves the thermal insulation performance of the battery 100.

[0102] Optionally, see Figure 7 The insulating plate 401 and the metal plate 402 can be connected by sealant 415 to form a closed space for the first air barrier 409, and the metal plate 402 and the composite plate 403 can be connected by structural sealant 416 to form a closed space for the second air barrier 410, thereby further improving the thermal insulation performance of the battery 100.

[0103] According to some embodiments of the present application, optionally, a first air barrier 409 is formed between the insulating plate 401 and the metal plate 402, or a second air barrier 410 is formed between the composite plate 403 and the metal plate 402. The heat preservation performance of the battery 100 can also be improved.

[0104] According to some embodiments of the present application, optionally, the metal plate 402 includes a first surface 411 and a second surface 412 along the thickness direction, the first surface 411 is provided with a first recess 413, the insulating plate 401 is connected to the first surface 411 and covers the first recess 413 to form a first air barrier 409, and the second surface 412 is provided with a second recess 414, and the composite plate 403 is connected to the second surface 412 and covers the second recess 414 to form a second air barrier 410.

[0105] Please combine Figure 7 and Fig.11 The thickness direction of the metal plate 402 is the up-down direction, the first surface 411 of the metal plate 402 is the upper surface, and the second surface 412 is the lower surface.

[0106] The present application does not specifically limit the shape and number of the depressions. Optionally, the metal plate 402 is formed by stamping with a plurality of reinforcing ribs 404 arranged at intervals along the first direction. With the upper surface as a reference, the reinforcing ribs 404 protrude toward the lower surface. The area corresponding to the plurality of reinforcing ribs 404 on the upper surface is formed as a plurality of first depressions 413 arranged at intervals along the first direction, and on the lower surface, the area between two adjacent reinforcing ribs 404 is formed as a second depression 414, and the plurality of second depressions 414 are arranged at intervals along the first direction.

[0107] The insulating plate 401 is connected to the upper surface of the metal plate 402 and covers the first recess 413 to form a first air barrier 409. The composite plate 403 is connected to the lower surface of the metal plate 402 and covers the second recess 414 to form a second air barrier 410.

[0108] It is understandable that in other embodiments, the depression is not limited to being formed by the above-mentioned method of forming the reinforcing rib 404 by stamping, but can also be formed by grooving, drilling blind holes, etc. on the upper and lower surfaces of the metal plate 402, and the present application does not make specific limitations here.

[0109] By setting a recess on the metal plate 402, in conjunction with the insulating plate 401 and the composite plate 403, during the assembly of the bottom guard plate 40, the insulating plate 401 is connected to the first surface 411 of the metal plate 402, so that the first recess 413 can form a first air barrier 409, and the composite plate 403 is connected to the second surface 412 of the metal plate 402, so that the second recess 414 can form a second air barrier 410. The method of forming the air barrier is simple and efficient.

[0110] In other embodiments, a spacer may be used to separate the insulating plate 401 and the metal plate 402 to form a first air barrier 409 , and to separate the composite plate 403 and the metal plate 402 to form a second air barrier 410 .

[0111] According to some embodiments of the present application, optionally, the metal plate 402 includes a first surface 411 and a second surface 412 along the thickness direction, the first surface 411 is provided with a first recess 413, the insulating plate 401 is connected to the first surface 411 and covers the first recess 413 to form a first air barrier 409, or, the second surface 412 is provided with a second recess 414, and the composite plate 403 is connected to the second surface 412 and covers the second recess 414 to form a second air barrier 410. The formation method of the first air barrier 409 or the second air barrier 410 is simple and efficient.

[0112] According to some embodiments of the present application, optionally, a plurality of first air barriers 409 and a plurality of second air barriers 410 are alternately arranged along the first direction.

[0113] Please combine Figure 7 and Fig.11 The first direction is the front-to-back direction, and the plurality of first air barriers 409 and the plurality of second air barriers 410 are alternately arranged along the front-to-back direction.

[0114] At the first air barrier layer 409, the metal plate 402 is spaced apart from the insulating plate 401, and the second surface 412 of the metal plate 402 is connected to the composite plate 403. At the second air barrier layer 410, the metal plate 402 is spaced apart from the composite plate 403, and the first surface 411 of the metal plate 402 is connected to the insulating plate 401. Therefore, along the front-to-back direction, the connection between the metal plate 402 and the insulating plate 401 and the connection between the metal plate 402 and the composite plate 403 are alternately arranged, so that the plurality of first air barrier layers 409 and the plurality of second air barrier layers 410 are alternately arranged along the front-to-back direction, and in the case where the plurality of first air barrier layers 409 and the plurality of second air barrier layers 410 are formed, the rigidity of the bottom guard plate 40 can be ensured.

[0115] According to some embodiments of the present application, optionally, the insulating plate 401 is connected to the metal plate 402 via a sealant 415 , and the composite plate 403 is connected to the metal plate 402 via a structural sealant 416 .

[0116] When the bottom guard plate 40 is connected to the box body 30, the insulating plate 401 faces the accommodating space, and the insulating plate 401 is located inside the battery 100. The bonding strength requirement between the insulating plate 401 and the metal plate 402 is relatively low, and the insulating plate 401 and the metal plate 402 only need to be sealed. Therefore, the insulating plate 401 and the metal plate 402 are connected by the sealant 415, which can connect the metal plate 402 and the insulating plate 401, and further enable the first air barrier 409 to form a closed space.

[0117] When the bottom guard plate 40 is connected to the box body 30, the composite plate 403 is located at the outermost layer of the bottom guard plate 40. During the use of the vehicle 1000, the composite plate 403 will be impacted by external objects, such as stone foundations, gravel, etc. Therefore, the bonding strength requirements between the composite plate 403 and the metal plate 402 are relatively high. The metal plate 402 and the composite plate 403 are connected by the structural sealant 416. On the one hand, the metal plate 402 and the composite plate 403 can be connected, and the second air barrier layer 410 can further form a closed space. On the other hand, the bonding strength of the structural sealant 416 is greater than that of the sealant 415, which ensures that the bonding strength between the metal plate 402 and the composite plate 403 meets expectations.

[0118] The insulating plate 401 and the metal plate 402 are connected by the sealant 415 to ensure the sealing performance. The metal plate 402 and the composite plate 403 are connected by the structural sealant 416 to ensure the sealing performance and bonding strength.

[0119] According to some embodiments of the present application, the present application also provides a battery 100, comprising a bottom guard plate 40 of any of the above schemes.

[0120] According to some embodiments of the present application, optionally, the battery 100 includes a battery cell 20 and a box body 30, the box body 30 is provided with a accommodating cavity 301, the accommodating cavity 301 is formed with an opening 302 on a side of the box body 30 along a third direction, the bottom guard plate 40 is connected to the box body 30 and covers the opening 302, the battery cell 20 is fixed in the accommodating cavity 301, the battery cell 20 includes a pole 201, the pole 201 faces the insulating plate 401 and is spaced from the insulating plate 401.

[0121] The battery 100 may be an inverted battery 100 . In one embodiment, when the inverted battery 100 is installed in the vehicle 1000 , the poles 201 of the battery cells 20 face downward, and the composite plate 403 of the bottom guard plate 40 faces the ground.

[0122] The pole 201 is spaced from the insulating plate 401. On the one hand, it can provide space for related components (such as busbar components, low-voltage sampling plates, etc.) to connect to the pole 201. On the other hand, it can prevent the pole 201 from hitting the insulating plate 401 and causing damage to the pole 201 and the insulating parts.

[0123] exist Figure 3 In the embodiment, the battery cell 20 is a square shell battery 100. It can be understood that the present application does not specifically limit the structure of the battery cell 20. In other embodiments, the battery cell 20 can be a cylindrical battery 100 or a blade battery 100.

[0124] According to some embodiments of the present application, optionally, the battery 100 includes a support bracket 60 , the battery cell 20 includes a second shell 202 , the pole 201 is arranged on a side of the second shell 202 along a third direction, and the support bracket 60 separates the second shell 202 and the insulating plate 401 .

[0125] Please refer to Figure 6 and Figure 7 The third direction is the up-down direction. The pole 201 is arranged on the lower side of the second shell 202 . The support bracket 60 separates the second shell 202 and the insulating plate 401 , so that the pole 201 can be separated from the insulating plate 401 .

[0126] Optionally, see Figure 3 The battery 100 includes n support brackets 60, each support bracket 60 is in a long strip shape, and multiple battery cells 20 are arranged in m rows along the first direction and in n-1 columns along the second direction. Each support bracket 60 supports the left side or right side of the lower side of the second shell 202 of the battery cells 20 in the same column. Two adjacent columns of battery cells 20 share one support bracket 60. Figure 3 In the embodiment, the battery 100 includes seven support brackets 60, and a plurality of battery cells 20 are arranged in six rows along the left-right direction.

[0127] Optionally, the support bracket 60 can support the shoulder of the battery cell 20, and the shoulder of the battery cell 20 can bear a certain pressure. When the external impact force hits the bottom guard plate 40, the external impact force can be transmitted to the shoulder of the battery cell 20 through the bottom guard plate 40 and the support bracket 60, so that the battery cell 20 can also bear part of the external impact force, reduce the concentration of pressure, and prevent the bottom guard plate 40 from being damaged by excessive force. The low-voltage sampling board, pole 201, battery cell 20, etc. can also be protected by the strength of the battery cell 20 itself. Please combine Figure 5 and Figure 6 The shoulder of the battery cell 20 may refer to the portion of the lower side of the second shell 202 close to the left and right edges.

[0128] According to some embodiments of the present application, optionally, the support bracket 60 and the insulating plate 401 are connected via a buffer layer 70 .

[0129] The buffer layer 70 can buffer the external impact force, reduce the external impact force transmitted from the insulating plate 401 to the support bracket 60 , and further reduce the external impact force transmitted to the battery cell 20 , thereby protecting the battery cell 20 .

[0130] In one example, the buffer layer 70 may be made of foam. Fig.12 The buffer layer 70 may be bonded to the lower side of the support bracket 60 by means of a double-sided adhesive 80 , and the support bracket 60 may be bonded to the second shell 202 of the battery cell 20 by means of a structural adhesive 90 .

[0131] In summary, the battery 100 and the bottom guard plate 40 of the present application have at least the following technical effects: 1) the thickness of the metal plate 402 can be reduced (for example, it can be reduced by 20%), thereby reducing the weight of the bottom guard plate 40; 2) the bottom guard plate 40 is formed by bonding three layers of plates, namely an insulating plate 401, a metal plate 402 (such as a steel plate) and a composite plate 403 (such as a high-strength composite plate), and the height dimension in the up and down directions is low, and the battery 100 has a large space advantage; 3) a reinforcing rib 404 is provided on the metal plate 402 to absorb the impact force of the bottom scraping; 4) the bottom guard plate 40 is connected to the battery cell 20 through the support bracket 60, and can withstand external forces through the battery cell 20 to form a bottom protection structure with better strength, and the low-voltage sampling plate, the pole 201, the battery cell 20, etc. are protected by the strength of the battery cell 20 itself; 5) the air barrier in the bottom guard plate 40 makes the bottom guard plate 40 have good thermal insulation performance. In some examples, compared to a conventional steel plate plus PVC bottom guard plate 40, the thermal conductivity of the bottom guard plate 40 of the present application is reduced by approximately 20% and the weight is reduced by approximately 27%.

[0132] According to some embodiments of the present application, the present application also provides an electrical device, comprising a battery according to any of the above schemes, and the battery is used to provide electrical energy to the electrical device.

[0133] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A bottom guard plate for a battery, characterized in that: The bottom guard plate comprises an insulating plate, a metal plate and a composite plate. Along the thickness direction of the bottom guard plate, the insulating plate, the metal plate and the composite plate are stacked and connected in sequence.

2. The bottom guard plate according to claim 1, characterized in that: The metal plate is provided with a plurality of reinforcing ribs, the plurality of reinforcing ribs are arranged at intervals along a first direction, the reinforcing ribs extend along a second direction, and the first direction is perpendicular to the second direction.

3. The bottom guard plate according to claim 1, characterized in that: The bottom guard plate includes a surrounding plate, the surrounding plate is connected to the periphery of the metal plate, the surrounding plate and the metal plate form a containing cavity, and the insulating plate is located in the containing cavity.

4. The bottom guard plate according to claim 3, characterized in that: The bottom guard plate includes a flange edge, the flange edge is connected to the edge of the enclosure away from the metal plate, and the flange edge is provided with a mounting hole.

5. The bottom guard plate according to claim 1, characterized in that: A first air barrier is formed between the insulating plate and the metal plate, and / or a second air barrier is formed between the composite plate and the metal plate.

6. The bottom guard plate according to claim 5, characterized in that: The metal plate comprises a first surface and a second surface along a thickness direction, the first surface is provided with a first recess, the insulating plate is connected to the first surface and covers the first recess to form the first air barrier, and / or; The second surface is provided with a second recess, and the composite board is connected to the second surface and covers the second recess to form the second air barrier.

7. The bottom guard plate according to claim 5 or 6, characterized in that: A plurality of the first air barriers and a plurality of the second air barriers are alternately arranged along a first direction.

8. The bottom guard plate according to claim 1, characterized in that: The insulating plate is connected to the metal plate by means of a sealant, and the composite plate is connected to the metal plate by means of a structural sealant.

9. A battery, characterized in that: Including the bottom guard plate described in any one of claims 1-8.

10. The battery according to claim 9, characterized in that The battery comprises a battery cell and a box body, the box body is provided with a receiving cavity, the receiving cavity is formed with an opening on a side of the box body along a third direction, the bottom guard plate is connected to the box body and covers the opening, the battery cell is fixed in the receiving cavity, the battery cell comprises a pole, the pole faces the insulating plate and is spaced apart from the insulating plate.

11. The battery according to claim 10, characterized in that The battery includes a support bracket, the battery cell includes a second shell, the pole is arranged on a side surface of the second shell along a third direction, and the support bracket separates the second shell and the insulating plate.

12. The battery according to claim 11, characterized in that The supporting bracket and the insulating plate are connected via a buffer layer.

13. An electrical device, characterized in that: The battery comprising any one of claims 9 to 12 is used for providing electrical energy.

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