Battery box

Abstract

The present application relates to the field of battery technology, and discloses a battery box, comprising a surrounding frame, a bottom plate, a middle beam and a first heat insulation plate; the surrounding frame is annular in structure; the bottom plate is connected to the surrounding frame, and the bottom plate and the surrounding frame enclose a storage space, and the bottom plate comprises a heat exchange plate, and the heat exchange plate and the storage space are arranged opposite to each other in a direction perpendicular to the bottom plate; the middle beam is respectively connected to the surrounding frame at both ends in the length direction to separate the storage space; the first heat insulation plate is arranged between the middle beam and the heat exchange plate, and the thermal conductivity of the first heat insulation plate is less than the thermal conductivity of the heat exchange plate; wherein, the middle beam has a first top wall and a first bottom wall, the first top wall and the first bottom wall are both arranged parallel to the bottom plate, and the first bottom wall is arranged toward the bottom plate, the first bottom wall, the first heat insulation plate and the heat exchange plate are fixedly connected by rivet connectors, and in a direction perpendicular to the bottom plate, the size of the first heat insulation plate is D1, the size of the heat exchange plate is D2, and the size of the first bottom wall is D3, satisfying: 0.14≤D1 / (D1+D2+D3)≤0.46.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] During the manufacturing process of batteries, the reliability of batteries is an issue that cannot be ignored. Therefore, how to improve the reliability of batteries is a technical problem that needs to be solved urgently in battery technology. Summary of the invention

[0004] The present application provides a battery box, a battery and an electrical device. The technical solution of the present application can improve the reliability of the battery.

[0005] In order to achieve the above objectives, the main technical solutions adopted in this application include:

[0006] The embodiment of the present application provides a battery box, comprising a surrounding frame, a bottom plate, a middle beam and a first heat insulation plate; the surrounding frame is constructed in a ring shape; the bottom plate is connected to the surrounding frame, and the bottom plate and the surrounding frame enclose a storage space, and the bottom plate comprises a heat exchange plate, and the heat exchange plate and the storage space are arranged opposite to each other in a direction perpendicular to the bottom plate; the middle beam is respectively connected to the surrounding frame at both ends in the length direction to separate the storage space; the first heat insulation plate is arranged between the middle beam and the heat exchange plate, and the thermal conductivity of the first heat insulation plate is smaller than the thermal conductivity of the heat exchange plate; wherein the middle beam has a first top wall and a first bottom wall , the first top wall and the first bottom wall are both arranged parallel to the bottom plate, the first bottom wall is arranged toward the bottom plate, the first bottom wall, the first heat insulation plate and the heat exchange plate are fixedly connected by rivet connectors, and along the direction perpendicular to the bottom plate, the size of the first heat insulation plate is D1, the size of the heat exchange plate is D2, and the size of the first bottom wall is D3, satisfying: 0.14≤D1 / (D1+D2+D3)≤0.46, the D1 satisfies: 1mm≤D1≤2mm, and the (D1+D2+D3) satisfies: 4mm≤(D1+D2+D3)≤7mm.

[0007] In the above scheme, the first bottom wall, the first heat insulation plate and the heat exchange plate are fixedly connected by rivet connectors, so that the first bottom wall, the first heat insulation plate and the heat exchange plate can be quickly and simply fixed, which is simple to operate, saves time and effort, and improves the production efficiency of the battery. At the same time, the size of the first heat insulation plate is D1, the size of the heat exchange plate is D2, and the thickness of the first bottom wall is D3, which satisfies: 0.14≤D1 / (D1+D2+D3)≤0.46. Therefore, on the one hand, it ensures that the first heat insulation plate has sufficient structural strength, reducing the probability of the first heat insulation plate being crushed under the riveting process, thereby improving the reliability of the battery box; on the other hand, the thickness of the first heat insulation plate is not too thick, reducing the probability that the rivet force is insufficient to seal the heat exchange plate and the center beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0009] Figure 1 A schematic diagram of a vehicle according to some embodiments of the present application;

[0010] Figure 2 A three-dimensional diagram of a battery box in some embodiments of the present application;

[0011] Figure 3 A top view of a battery cell in some embodiments of the present application;

[0012] Figure 4 for Figure 3 Cross-sectional view along AA direction;

[0013] Figure 5 for Figure 4 The enlarged partial view of D is circled;

[0014] Figure 6 for Figure 3 Cross-sectional view along direction BB;

[0015] Figure 7 for Figure 6 The enlarged schematic diagram of the part E is circled;

[0016] Figure 8 for Figure 6 The enlarged schematic diagram of the part F is circled;

[0017] Fig. 9 for Figure 3 Cross-sectional view along CC direction;

[0018] Fig.10 for Fig. 9 A partial enlarged schematic diagram of G is circled.

[0019] [Explanation of the accompanying drawings] Battery box 100, frame 110, first side beam 111, second side beam 112, third side beam 113, fourth side beam 114, bottom plate 120, heat exchange plate 121, first heat exchange plate 121a, second heat exchange plate 121b, middle beam 130, first top wall 130a, first bottom wall 130b, first middle beam 131, second middle beam 132, first heat insulation board 141, accommodating space 101, battery compartment 101a, electrical compartment 101b, rivet connector 160, first flange 111a, second flange 112a. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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 those skilled in the art without creative work are within the scope of protection of the present application.

[0021] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application 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 drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0022] Reference to "embodiments" in this application 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 in this application may be combined with other embodiments.

[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. 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 application generally indicates that the associated objects before and after are in an "or" relationship.

[0025] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0026] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0027] In some embodiments, the battery may be a battery pack, which includes a battery case and battery cells, wherein the battery cells or battery modules are accommodated in the battery case.

[0028] In some embodiments, the battery cell may be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material by charging after the battery cell is discharged. The battery cell may be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., and the embodiments of the present application are not limited thereto.

[0029] In recent years, electric vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role. As the core component of electric vehicles, batteries have high requirements in terms of stability.

[0030] At present, in a battery box, a heat insulation part can usually be set between the center beam and the heat exchange plate to reduce the heat transfer rate. The heat exchange plate, the heat insulation part and the center beam can be fixedly connected by threaded fasteners or welding. However, the connection method using threaded fasteners or welding is cumbersome and time-consuming, so the production efficiency of the battery box is low.

[0031] In view of this, in order to improve the production efficiency of the battery case while also taking into account the structural stability of the battery case, some embodiments of the present application provide a battery case, which includes a surrounding frame, a bottom plate, a middle beam and a first heat insulation board.

[0032] The frame is constructed in a ring shape, the bottom plate is connected to the frame, the bottom plate and the frame enclose a storage space, the bottom plate includes a heat exchange plate, and the heat exchange plate is arranged opposite to the storage space in a direction perpendicular to the bottom plate; the middle beam is respectively connected to the frame at both ends in the length direction to separate the storage space; the first heat insulation plate is arranged between the middle beam and the heat exchange plate, and the thermal conductivity of the first heat insulation plate is smaller than the thermal conductivity of the heat exchange plate; wherein the middle beam has a first top wall and a first bottom wall, the first top wall and the first bottom wall are both arranged parallel to the bottom plate, the first bottom wall is arranged toward the bottom plate, the first bottom wall, the first heat insulation plate and the heat exchange plate are fixedly connected by rivet connectors, and in a direction perpendicular to the bottom plate, the size of the first heat insulation plate is D1, the size of the heat exchange plate is D2, and the size of the first bottom wall is D3, satisfying: 0.14≤D1 / (D1+D2+D3)≤0.46.

[0033] In the above scheme, the first bottom wall, the first heat insulation plate and the heat exchange plate are fixedly connected by rivet connectors, so that the first bottom wall, the first heat insulation plate and the heat exchange plate can be quickly and simply fixed, which is simple to operate, saves time and effort, and improves the production efficiency of the battery. At the same time, the size of the first heat insulation plate is D1, the size of the heat exchange plate is D2, and the thickness of the first bottom wall is D3, which satisfies: 0.14≤D1 / (D1+D2+D3)≤0.46. Therefore, on the one hand, it ensures that the first heat insulation plate has sufficient structural strength, reducing the probability of the first heat insulation plate being crushed under the riveting process, thereby improving the reliability of the battery box; on the other hand, the thickness of the first heat insulation plate is not too thick, reducing the probability that the rivet force is insufficient to seal the heat exchange plate and the center beam.

[0034] The battery disclosed in the embodiment of the present application can be used in, but not limited to, vehicles, and can also be used in other electrical devices with structural beams, wherein the battery can avoid the structural beams of other electrical devices.

[0035] The battery disclosed in the embodiment of the present application can be used, but not limited to, in an electrical device having a longitudinal beam such as a vehicle, a ship or an aircraft, and the battery can avoid the structural beam. The power supply system of the electrical device can be composed of the battery disclosed in the present application.

[0036] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a heavy truck, a bus, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0037] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0038] Please refer to Figure 1 , Figure 1 Schematic diagram of vehicle 1000 of some embodiments of the present application. 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. The type of vehicle 1000 may be a sedan, an off-road vehicle, a heavy truck or a bus, etc. A battery 400 is provided inside the vehicle 1000, and the battery 400 may be provided at the bottom, the head or the tail of the vehicle 1000. The battery 400 may be used to power the vehicle 1000, for example, the battery 400 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0039] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 400 to supply power to the motor 300 , for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000 .

[0040] In some embodiments of the present application, the battery 400 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0041] Some embodiments of the present application provide a battery box, please refer to Figure 2-Figure 9 , Figure 2 This is a three-dimensional diagram of a battery box in some embodiments of the present application. Figure 3 This is a top view of a battery cell in some embodiments of the present application. Figure 4 for Figure 3 Cross-sectional view along AA direction, Figure 5 for Figure 4 The enlarged view of the part D is circled. Figure 6 for Figure 3 Cross-sectional view along BB direction, Figure 7 for Figure 6The enlarged schematic diagram of the part E is circled. Figure 8 for Figure 6 The enlarged schematic diagram of the part F is circled. Fig. 9 for Figure 3 Cross-sectional view along CC direction, Fig.10 for Fig. 9 A partial enlarged schematic diagram of G is circled.

[0042] The battery box 100 according to the embodiment of the present application may include a surrounding frame 110 , a bottom plate 120 , a middle beam 130 and a first heat insulation board 141 .

[0043] As the name implies, the frame 110 and the bottom plate 120 are the framework structure of the battery box 100 , and the battery cells or electrical components in the battery box 100 can be directly or indirectly mounted on the frame 110 and the bottom plate 120 .

[0044] The surrounding frame 110 may be made of metal, such as steel, so as to ensure that the surrounding frame 110 has sufficient structural strength.

[0045] The frame 110 can be constructed as an annular structure. For example, the frame 110 can include a first side beam 111, a third side beam 113, a second side beam 112 and a fourth side beam 114 connected end to end. The first side beam 111 and the second side beam 112 can be arranged relative to each other in one direction, and the third side beam 113 and the fourth side beam 114 can be arranged relative to each other in another direction.

[0046] The bottom plate 120 is connected to the frame 110. For example, along the thickness direction of the bottom plate 120, the bottom plate 120 can be fixedly connected to the frame 110, and the bottom plate 120 and the frame 110 enclose a receiving space 101. The receiving space 101 can be a space for receiving battery cells or a space for receiving electrical components, which is not limited in this application.

[0047] The bottom plate 120 includes a heat exchange plate 121, which is arranged opposite to the accommodating space 101 in a direction perpendicular to the bottom plate 120. The heat exchange plate 121 can exchange heat with the battery cells in the accommodating space 101, thereby adjusting the temperature of the battery cells and ensuring that the battery cells are at a suitable operating temperature.

[0048] Both ends of the middle beam 130 in the length direction are connected to the surrounding frame 110, and the middle beam 130 is disposed in the space (i.e., the accommodation space 101) surrounded by the surrounding frame 110 and the bottom plate 120, so that the middle beam 130 can separate the accommodation space 101, and the accommodation space 101 can be separated into a space for accommodating battery cells and a space for accommodating electrical components, etc., which is not specifically limited in this application. For example, both ends of the middle beam 130 in the length direction are connected to the first side beam 111 and the second side beam 112, respectively.

[0049] The heat exchange plate 121 can be connected to the surrounding frame 110, and the heat exchange plate 121 is arranged opposite to the accommodation space 101 along a direction perpendicular to the bottom plate 120. It should be noted that the direction perpendicular to the bottom plate 120 is also the thickness direction of the bottom plate 120.

[0050] A battery cell can be arranged in the accommodating space 101, and the heat exchange plate 121 and the accommodating space 101 are arranged relative to each other in a direction perpendicular to the bottom plate 120. The heat exchange plate 121 can be in direct or indirect contact with the battery cell. The heat exchange plate 121 can adjust the temperature of the battery cell so that the battery cell can always operate at a suitable temperature.

[0051] The first heat insulating plate 141 is disposed between the center beam 130 and the heat exchanging plate 121 in a direction perpendicular to the bottom plate 120 . The first heat insulating plate 141 can separate the center beam 130 from the heat exchanging plate 121 , so that the heat exchanging plate 121 does not directly contact the center beam 130 .

[0052] At the same time, the thermal conductivity of the first heat insulation plate 141 is smaller than that of the heat exchange plate 121 , thereby reducing the heat transferred from the heat exchange plate 121 to the center beam 130 , so that the heat exchange plate 121 can exchange heat with the battery cells to the greatest extent.

[0053] In an embodiment of the present application, the center beam 130 has a first top wall 130a and a first bottom wall 130b. The first top wall 130a and the first bottom wall 130b are both arranged parallel to the bottom plate 120. The first bottom wall 130b is arranged toward the bottom plate 120, or the first bottom wall 130b is closer to the bottom plate 120 than the first top wall 130a. The first top wall 130a and the first bottom wall 130b are relatively arranged in a direction perpendicular to the bottom plate 120.

[0054] The first bottom wall 130b, the first heat insulation plate 141 and the heat exchange plate 121 are fixedly connected by rivet connectors 160, so that the first bottom wall 130b, the first heat insulation plate 141 and the heat exchange plate 121 can be quickly and simply fixed, which is simple to operate, saves time and effort, and improves the production efficiency of the battery.

[0055] Along the thickness direction of the frame, the size of the first heat insulation plate 141 is D1, the size of the heat exchange plate 121 is D2, and the thickness of the first bottom wall 130b is D3, satisfying: 0.14≤D1 / (D1+D2+D3)≤0.46.

[0056] The rivet connector 160 needs to pass through the first bottom wall 130b, the first insulation plate 141 and the heat exchange plate 121. Since the rivet force is within a fixed range, D1+D2+D3 is also within a fixed range. D1 / (D1+D2+D3) represents the proportion of the thickness of the first insulation plate 141 within the fixed thickness.

[0057] For example, D1 / (D1+D2+D3) can be 0.14, 0.18, 0.22, 0.26, 0.3, 0.34, 0.38, 0.42 or 0.46. The present application does not limit the specific value of D1 / (D1+D2+D3), as long as D1 / (D1+D2+D3) meets the above range.

[0058] Generally speaking, the larger the size D1 of the first heat insulation board 141, the better the structural strength of the first heat insulation board 141. Since 0.14≤D1 / (D1+D2+D3)≤0.46, on the one hand, it can ensure that the first heat insulation board 141 has sufficient structural strength, reducing the probability of the first heat insulation board 141 being crushed during the riveting process, and also reducing the probability of the first heat insulation board 141 having poor insulation effect due to the size D1 of the first heat insulation board 141 being too small, thereby improving the reliability of the battery box 100; on the other hand, the thickness of the first heat insulation board 141 is not too thick, reducing the probability that the riveting force is insufficient to seal the heat exchange plate 121 and the center beam 130.

[0059] According to some embodiments of the present application, D1 satisfies: 1mm≤D1≤2mm, and (D1+D2+D3) satisfies: 4mm≤(D1+D2+D3)≤7mm.

[0060] For example, the size D1 of the first heat insulation board 141 may be 1 mm, 1.25 mm, 1.5 mm, 1.75 mm or 2 mm. Thus, the first heat insulation board 141 is ensured to have the effect of blocking heat transfer, while also reducing the probability of the overall energy density of the battery being reduced due to the excessive thickness of the first heat insulation board 141.

[0061] (D1+D2+D3) can be 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm or 7mm. The present application does not limit the specific value of (D1+D2+D3). As long as (D1+D2+D3) satisfies: 4mm≤(D1+D2+D3)≤7mm, it is within the protection scope of the present application.

[0062] Therefore, on the one hand, the overall size of the first bottom wall 130b, the first heat insulation plate 141 and the heat exchange plate 121 in the direction perpendicular to the bottom plate 120 is sufficient so as to have sufficient strength to support the rivet connector. On the other hand, the overall size of the first bottom wall 130b, the first heat insulation plate 141 and the heat exchange plate 121 in the direction perpendicular to the bottom plate 120 is not too large, thereby significantly reducing the overall energy density of the battery.

[0063] In some embodiments of the present application, the size of the first heat insulation board 141 may be 1 mm-2 mm in a direction perpendicular to the bottom plate 120. For example, the size D1 of the first heat insulation board 141 may be 1 mm, 1.25 mm, 1.5 mm, 1.75 mm or 2 mm. In this way, the first heat insulation board 141 is ensured to have the effect of blocking heat transfer, while also reducing the probability of the overall energy density of the battery being reduced due to the excessive thickness of the first heat insulation board 141.

[0064] The size D2 of the heat exchange plate 121 may be 1.8 mm to 2.4 mm in a direction perpendicular to the bottom plate 120. For example, the size of the heat exchange plate 121 may be 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm or 2.4 mm. Thus, the structural strength of the heat exchange plate 121 is improved while ensuring that the heat exchange plate 121 has sufficient heat exchange capacity.

[0065] In the direction perpendicular to the bottom plate 120, the size of the first bottom wall 130b can be 1.6mm-2.5mm. For example, the size of the first bottom wall 130b can be 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm or 2.5mm. In this way, the first bottom wall 130b is guaranteed to have sufficient structural strength, while the first bottom wall 130b is not too large in the direction perpendicular to the bottom plate 120, which will cause riveting difficulties or significantly reduce the energy density of the battery.

[0066] In addition, in the present application, the direction perpendicular to the bottom plate 120 is represented by X in the drawings, the first direction is represented by Y, and the second direction is represented by Z.

[0067] In some embodiments of the present application, the ratio of the projected area of ​​the first heat insulation board 141 to the projected area of ​​the middle beam 130 along the direction perpendicular to the bottom plate 120 is not greater than 1.2. For example, the ratio of the projected area of ​​the first heat insulation board 141 to the projected area of ​​the middle beam 130 may be 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, etc.

[0068] That is to say, along the direction perpendicular to the bottom plate 120, the projection area of ​​the first heat insulation board 141 can be less than or equal to the projection area of ​​the middle beam 130. This ensures the connection stability and sealing between the first heat insulation board 141 and the middle beam 130, and also prevents the first heat insulation board 141 from excessively extending into the sub-chamber formed after the accommodation space 101 is divided by the middle beam 130. The first heat insulation board 141 does not even extend into the sub-chamber formed after the accommodation space 101 is divided by the middle beam, thereby reducing the probability of interference between the first heat insulation board 141 and the battery cells or electrical components in the sub-chamber.

[0069] Of course, along the direction perpendicular to the bottom plate 120, the projection area of ​​the first heat insulation board 141 can be larger than the projection area of ​​the middle beam 130, so that a portion of the first heat insulation board 141 can extend into the sub-chamber separated by the middle beam 130. It should be noted that a portion of the first heat insulation board 141 can extend into the sub-chamber separated by the middle beam 130 to be the electrical compartment 101b for accommodating electrical components. The first heat insulation board 141 will not extend into the battery compartment 101a for accommodating battery cells.

[0070] In some embodiments of the present application, along the direction perpendicular to the bottom plate 120, the projection of the first heat insulation board 141 falls within the projection of the middle beam 130. Therefore, in the direction perpendicular to the bottom plate 120, the first heat insulation board 141 does not protrude from the middle beam 130, so that the first heat insulation board 141 does not interfere with the components in the multiple sub-chambers separated by the middle beam 130, and of course does not interfere with the frame.

[0071] Along the first direction, the size of the projection of the first heat insulation board 141 is smaller than the size of the projection of the middle beam 130, and the first direction, the length direction of the middle beam 130, and the thickness direction of the bottom plate 120 are perpendicular to each other. The middle beam 130 divides the accommodation space 101 in the first direction, so that the accommodation space 101 can be divided into a plurality of sub-chambers. Since along the first direction, the size of the projection of the first heat insulation board 141 is smaller than the size of the projection of the middle beam 130, the first heat insulation board 141 will not extend into the sub-chamber, reducing the probability of the first heat insulation board 141 interfering with the battery cells or electrical components in the sub-chamber.

[0072] According to some embodiments of the present application, along the first direction, the projection of the first heat insulation board 141 has a first edge and a second edge, and the projection of the middle beam 130 has a third edge and a fourth edge;

[0073] Along the first direction, the first edge and the third edge are located on the same side and the distance between the first edge and the third edge is not greater than 5 mm, and the second edge and the fourth edge are located on the same side and the distance between the second edge and the fourth edge is not greater than 5 mm.

[0074] The first edge will not protrude beyond the third edge, and the second edge will not protrude beyond the fourth edge. Since the distance between the first edge and the third edge is not greater than 5 mm, and the distance between the second edge and the fourth edge is not greater than 5 mm, on the one hand, along the first direction, it is ensured that both ends of the first thermal insulation board 141 do not extend into the corresponding sub-chamber, and on the other hand, it is ensured that the size of the first thermal insulation board 141 is not too small, resulting in insufficient thermal insulation and sealing effects.

[0075] According to some embodiments of the present application, along a direction perpendicular to the bottom plate 120, the projection of the first heat insulation board 141 falls within the projection of the center beam 130; along the first direction, the size of the projection of the first heat insulation board 141 is equal to the size of the projection of the center beam 130, and the first direction, the length direction of the center beam 130 and the direction perpendicular to the bottom plate 120 are perpendicular to each other.

[0076] In the above solution, the center beam 130 divides the accommodation space 101 in the first direction, so that the accommodation space 101 can be divided into a plurality of sub-chambers. Since the size of the projection of the first heat insulation board 141 along the first direction is equal to the size of the projection of the center beam 130, the two ends of the first heat insulation board 141 in the first direction can be flush with the two ends of the center beam 130 in the first direction, and the first heat insulation board 141 will not extend into the sub-chamber, reducing the probability of the first heat insulation board 141 interfering with the battery cells or electrical components in the sub-chamber.

[0077] In some embodiments of the present application, the accommodating space 101 includes a battery compartment 101a and an electrical compartment 101b, and the middle beam 130 is used to separate the battery compartment 101a and the electrical compartment 101b. That is, one side of the middle beam 130 in the thickness direction is the battery compartment 101a, and the other side is the electrical compartment 101b.

[0078] In other embodiments, there are multiple battery compartments 101a, and the middle beam 130 is used to separate two adjacent battery compartments 101a. In other words, one side of the middle beam 130 in the thickness direction is a battery compartment 101a, and the other side is also a battery compartment 101a.

[0079] In other embodiments, there are multiple battery compartments 101a, and a portion of the middle beam 130 is used to separate the battery compartment 101a from the electrical compartment 101b. That is, one side of this portion of the middle beam 130 in the thickness direction is the battery compartment 101a, and the other side is the electrical compartment 101b. Another portion of the middle beam 130 is used to separate two adjacent battery compartments 101a. That is, one side of this portion of the middle beam 130 in the thickness direction is the battery compartment 101a, and the other side is also the battery compartment 101a.

[0080] According to some embodiments of the present application, the middle beam 130 includes a first middle beam 131, and the first middle beam 131 is respectively connected to the frame 110 at both ends in the length direction to separate the battery compartment 101a and the electrical compartment 101b; along the first direction, the projection of the first heat insulation board 141 in the direction perpendicular to the bottom plate 120 has a first edge and a second edge, and the projection of the first middle beam 131 in the direction perpendicular to the bottom plate 120 has a third edge and a fourth edge, the first edge and the third edge are both facing the electrical compartment 101b, and the second edge and the fourth edge are both facing the battery compartment 101a, along the first direction, the first edge exceeds the third edge, and the second edge does not exceed the fourth edge, and the first direction, the length direction of the middle beam and the direction perpendicular to the bottom plate 120 are perpendicular to each other.

[0081] That is to say, the first center beam 131 is also the center beam 130 , and the above-mentioned structural limitations and parameter limitations on the center beam 130 can also be applied to the first center beam 131 .

[0082] It can be understood that the direction of the bottom plate 120 is the thickness direction of the bottom plate.

[0083] In the above scheme, the spaces on both sides of the first central beam 131 in the first direction are the battery compartment 101a and the electrical compartment 101b respectively. Since the space in the electrical compartment 101b is relatively ample, the first edge can exceed the third edge along the first direction, so that the first heat insulation board 141 can extend into the electrical compartment, and the second edge does not exceed the fourth edge, so that the first heat insulation board 141 will not extend into the battery compartment 101a.

[0084] In some embodiments of the present application, the material of the first heat insulation board 141 may include epoxy resin. For example, the first heat insulation board 141 may be an epoxy resin piece, thereby making the first heat insulation board 141 have good heat insulation ability and effectively reducing the heat transferred from the heat exchange plate 121 to the center beam 130.

[0085] According to some embodiments of the present application, there are multiple rivet connectors 160, and the multiple rivet connectors 160 are arranged at intervals;

[0086] The first heat insulation board 141 has a first through hole for the rivet connector 160 to pass through, and there are multiple first through holes, and the multiple first through holes correspond one to one to the multiple rivet connectors 160. Therefore, the multiple rivet connectors 160 can more firmly fix the center beam 130, the first heat insulation board 141 and the heat exchange plate 121 together.

[0087] For example, the first heat insulation board 141 may be a whole long strip, and the first heat insulation board 141 is fixed to the center beam 130 through a plurality of rivet connectors 160. Therefore, on the one hand, the first heat insulation board 141 is a whole long strip, and the assembly efficiency is higher than that of the first heat insulation board 141 being divided into a plurality of small parts. On the other hand, the first heat insulation board 141 is a whole long strip, and the heat insulation effect is also better.

[0088] According to some embodiments of the present application, the number of the first through holes is N1, satisfying: 2≤N1 / D1≤12.

[0089] N1 / D1 represents the number of first through holes opened on the first heat insulation board 141 per unit thickness. The larger N1 / D1 is, the weaker the strength of the first heat insulation board 141 is, and the smaller N1 / D1 is, the better the strength of the first heat insulation board 141 is.

[0090] For example, N1 / D1 can be 2, 4, 6, 8, 10, or 12. The present application does not limit the specific value of N1 / D1. As long as the value of N1 / D1 is within the above range, it is within the protection scope of the present application. It should be noted that the unit of the thickness of the first heat insulation board 141 in the present application is millimeter.

[0091] Since the number of the first through holes and the size of the first heat insulation board 141 in the thickness direction of the frame satisfy the above relationship, on the one hand, it ensures that the first heat insulation board 141 has sufficient structural strength, reducing the probability of the first heat insulation board 141 being crushed during the riveting process due to insufficient strength of the first heat insulation board 141. On the other hand, it also alleviates the problem of poor sealing connection between the heat exchange plate 121 and the first center beam 131 due to the excessive size of the first heat insulation board 141 in the thickness direction of the frame.

[0092] In some embodiments of the present application, along the thickness direction of the frame, the heat exchange plate 121 includes a first heat exchange plate 121a and a second heat exchange plate 121b connected in sequence, and the first heat insulation plate 141 is arranged between the first heat exchange plate 121a and the center beam 130; the first heat exchange plate 121 is constructed as a flat plate structure, and a heat exchange channel is arranged in the second heat exchange plate 121.

[0093] The material of the first heat exchange plate 121a and the material of the second heat exchange plate 121b may be the same, or the thermal conductivity of the first heat exchange plate 121a and the thermal conductivity of the second heat exchange plate 121b may be the same, thereby allowing heat to be transferred between the first heat exchange plate 121a and the second heat exchange plate 121b at a relatively even rate.

[0094] The first heat exchange plate 121a is constructed as a flat plate structure, and there are no grooves on the first heat exchange plate 121a. Therefore, on the one hand, the first heat exchange plate 121a is simple to shape, and on the other hand, compared with the uneven structure of the first heat exchange plate 121a, the flat plate-shaped first heat exchange plate 121a has a shorter heat transfer path. Of course, since the first heat exchange plate 121a is constructed as a flat plate structure, the first heat exchange plate 121a is equivalent to a heat spreader, which can evenly transfer heat to the battery cell and reduce the working temperature difference of each area on the battery cell.

[0095] According to some embodiments of the present application, the first bottom wall 130 b and the first heat insulation board 141 respectively have a first side surface and a second side surface in contact with each other, and both the first side surface and the second side surface are configured as planes.

[0096] That is to say, the sides of the first bottom wall 130b and the first insulation board 141 that are in contact with each other are both planes, so that, on the one hand, the first wall and the first insulation board 141 can be more stably matched, and on the other hand, there are no grooves on the sides of the first bottom wall 130b and the first insulation board 141 facing each other, so molding is easy.

[0097] In some embodiments of the present application, a first adhesive layer is provided between the heat exchange plate 121 and the first heat insulation plate 141. Before the rivet connector 160 passes through the heat exchange plate 121, the first heat insulation plate 141 and the middle beam 130, the first heat insulation plate 141 needs to be pre-positioned on the heat exchange plate 121. The present application uses the first adhesive layer to pre-bond the first heat insulation plate 141 to the middle beam 130, thereby reducing the probability of the first heat insulation plate 141 being offset or even falling off during the process of the rivet connector 160 passing through the heat exchange plate 121, the first heat insulation plate 141 and the middle beam 130 to achieve fastening.

[0098] It should be noted that after the rivet connector 160 passes through the first adhesive layer, the first adhesive layer will deform as the rivet connector 160 moves, thereby sealing the gap between the rivet connector 160 and the first bottom wall 130b, thereby improving the sealing performance of the battery box 100.

[0099] According to some embodiments of the present application, along the thickness direction of the frame, the size of the first adhesive layer is t, satisfying: 0.05mm≤t≤1mm.

[0100] The larger the size t of the first adhesive layer is, the more securely the first heat insulation plate 141 can be positioned on the heat exchange plate 121 . The smaller the size t of the first adhesive layer is, the less likely the adhesive will enter the battery compartment 101 a , thereby reducing the impact on the battery cells in the battery compartment 101 a .

[0101] For example, the size t of the first adhesive layer can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm. The present application does not limit the specific value of the first adhesive layer. As long as the size t of the first adhesive layer meets the above range, it is within the protection scope of the present application.

[0102] Thus, on the one hand, it can ensure that the first heat insulation plate 141 can be firmly positioned on the heat exchange plate 121, and on the other hand, it can ensure that the thickness of the first adhesive layer is not too thick and overflows into the accommodation space 101 in large quantities, thereby affecting the battery cells.

[0103] In some embodiments of the present application, the thermal conductivity of the first adhesive layer is greater than or equal to 0.38 W / (mK). It should be noted that in the present application, the thermal conductivity of the first adhesive layer can be measured using the test standard of GB / T 10297-2015.

[0104] Thus, on the one hand, the first adhesive layer is ensured to have sufficient heat insulation effect and reduce the heat transfer rate in the first adhesive layer, and on the other hand, the material selection of the first adhesive layer is ensured to have sufficient substitutability and reduce the use cost of the first adhesive layer. Of course, when the first adhesive layer uses adhesive with poor thermal conductivity, it is necessary to ensure sufficient bonding strength.

[0105] In some embodiments of the present application, along the second direction, the surrounding frame 110 includes a first side beam 111 and a second side beam 112 spaced apart, and both ends of the first middle beam 131 are respectively connected to the first side beam 111 and the second side beam 112, and the second direction is parallel to the length direction of the first middle beam 131;

[0106] At least one of the first side beam 111 and the second side beam 112 is provided with a convex edge extending toward the accommodating space 101 , and along a direction perpendicular to the bottom plate 120 , a projection of the convex edge partially overlaps with a projection of the heat exchange plate 121 .

[0107] That is, any one of the first side beam 111 and the second side beam 112 may be provided with a convex edge, or both of the first side beam 111 and the second side beam 112 may be provided with a convex edge.

[0108] In the above scheme, since at least one of the first side beam 111 and the second side beam 112 of the present application is provided with a convex edge, and the projection of the convex edge partially overlaps with the projection of the heat exchange plate 121 along the direction perpendicular to the bottom plate 120, it is convenient to fix the first side beam 111 and / or the second side beam 112 to the heat exchange plate 121, thereby improving the connection efficiency and connection effect.

[0109] According to some embodiments of the present application, the convex edge includes a first convex edge 111a and a second convex edge 112a, and the first side beam 111 and the second side beam 112 are respectively provided with the first convex edge 111a and the second convex edge 112a extending toward the accommodating space 101. In a direction perpendicular to the bottom plate 120, the projection of the first convex edge 111a partially overlaps with the projection of the heat exchange plate 121, and the projection of the second convex edge 112a partially overlaps with the projection of the heat exchange plate 121.

[0110] Since the first convex edge 111a and the second convex edge 112a are respectively provided on the first side beam 111 and the second side beam 112 of the present application, and along the direction perpendicular to the bottom plate 120, the projection of the first convex edge 111a partially overlaps with the projection of the heat exchange plate 121, and the projection of the second convex edge 112a partially overlaps with the projection of the heat exchange plate 121, it is convenient to fix the first side beam 111 and the second side beam 112 to the heat exchange plate 121 respectively.

[0111] In some embodiments, the first flange 111 a and the heat exchange plate 121 may be fixedly connected by friction welding, and the second flange 112 a and the heat exchange plate 121 may also be fixedly connected by friction welding.

[0112] In some embodiments of the present application, along the second direction, two ends of the first heat insulation board 141 are in contact with the first convex edge 111 a and the second convex edge 112 a respectively.

[0113] Since the first heat insulation board 141 is respectively connected to the first flange 111a and the second flange 112a at both ends in the second direction, on the one hand, the first heat insulation board 141 has a better heat insulation effect and can effectively block the heat transferred from the heat exchange plate 121 to the central beam 130. On the other hand, the first heat insulation board 141 has a better sealing performance and it is not easy for dust, impurities or condensed water to enter between the central beam 130 and the heat exchange plate 121.

[0114] In some embodiments of the present application, along the second direction, two ends of the first heat insulation board 141 are respectively spaced apart from the first flange 111a and the second flange 112a and the spacing distance is E, satisfying: 3mm≤E≤7mm.

[0115] For example, along the second direction, the distance between the first flange 111a and the first insulation board 141 and the distance between the second flange 112a and the first insulation board 141 may be 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, and 7 mm.

[0116] Since the two ends of the first heat insulation plate 141 are respectively spaced apart from the first flange 111a and the second flange 112a along the second direction, the probability of the first heat insulation plate 141 expanding due to temperature increase and squeezing the first flange 111a and the second flange 112a is reduced, thereby effectively reducing the probability of deformation of the first heat insulation plate 141, thereby improving the overall structural stability of the battery box 100.

[0117] According to some embodiments of the present application, along a direction perpendicular to the bottom plate 120 , the sides of the first flange 111a and the second flange 112a facing the accommodating space 101 both protrude beyond the sides of the first heat insulation plate 141 facing the accommodating space 101 ; along a direction perpendicular to the bottom plate 120 , the side portion of the first heat exchange plate 121 protrudes to contact the first heat insulation plate 141 .

[0118] At the same time, since the bottom of the middle beam 130 not only contacts the side of the first convex edge 111a and the second convex edge 112a facing the first accommodating space 101, but also contacts the side of the first heat insulation board 141 facing the first accommodating space 101. Therefore, in the length direction of the middle beam 130, the middle area of ​​the bottom of the middle beam 130 is protruding compared with the two end areas, the protruding middle area contacts the first heat insulation board 141, and the two end areas contact the first convex edge 111a and the second convex edge 112a respectively.

[0119] That is, the middle area and the two end areas form step portions respectively. Thus, along the length direction of the middle beam 130, the first flange 111a and the second flange 112a are also arranged opposite to the protruding middle area respectively. Thus, the connection between the middle beam 130 and the surrounding frame 110 is more stable, and the overall strength of the battery box 100 is higher.

[0120] According to some embodiments of the present application, the room temperature tensile strength of the first heat insulation board 141 is not less than 135 MPa.

[0121] For example, the hardness of the first heat insulation board 141 may be 135 MPa, 140 MPa, 145 MPa, 150 MPa or 155 MPa.

[0122] Therefore, on the one hand, it can be ensured that the hardness of the first insulation board 141 is sufficient under the riveting process, and the first insulation board 141 has sufficient supporting strength. On the other hand, it can be ensured that the first insulation board 141 has a certain deformation amount, reducing the probability of the first insulation board 141 being easily crushed due to excessive hardness.

[0123] According to some embodiments of the present application, there may be a plurality of middle beams 130, including a first middle beam 131 and a second middle beam 132, the first middle beam 131 is respectively connected to the surrounding frame 110 at both ends in the length direction to separate the accommodating space 101 into a battery compartment 101a and an electrical compartment 101b, and the second middle beam 132 is respectively connected to the surrounding frame 110 at both ends in the length direction to separate the battery compartment 101a;

[0124] A first heat insulation board 141 is arranged between the first center beam 131 and the heat exchange plate 121, and the second center beam 132 is in contact with the heat exchange plate 121; or, a first heat insulation board 141 is arranged between the first center beam 131 and the heat exchange plate 121, and a second heat insulation board is also arranged between the second center beam 132 and the heat exchange plate 121, and along the direction perpendicular to the bottom plate 120, the thickness of the first heat insulation board 141 is greater than the thickness of the second heat insulation board.

[0125] That is to say, the first center beam 131 is also the center beam 130 , and the second center beam 132 is also the center beam 130 . The above structural and parameter limitations on the center beam 130 can also be applied to the first center beam 131 and the second center beam 132 .

[0126] A plurality of battery cells may be disposed in the battery compartment 101a, and electrical components may be disposed in the electrical compartment 101b. For example, a battery management system may be disposed in the electrical compartment 101b.

[0127] The first middle beam 131 has an electrical compartment 101 b and a battery compartment 101 a on both sides of its thickness direction, and the second middle beam 132 has a battery compartment 101 a on both sides of its thickness direction.

[0128] In the above scheme, since the heat exchange plate 121 is mainly used to regulate the temperature of the battery cells in the battery compartment 101a, by placing the first heat insulation plate 141 between the first center beam 131 and the heat exchange plate 121, the heat exchange between the heat exchange plate 121 and the first center beam 131 can be reduced, thereby reducing the heat transfer to the space outside the battery compartment 101a.

[0129] In addition, a second heat insulating plate is provided between the second center beam 132 and the heat exchange plate 121, so that the heat of the heat exchange plate 121 can be transferred to the second center beam 132. However, since battery cells are provided on both sides of the second center beam 132 in the thickness direction, the heat can also be indirectly transferred to the battery cells.

[0130] The thickness of the first heat insulation board 141 is greater than the thickness of the second heat insulation board in a direction perpendicular to the bottom plate 120. Since the first center beam 131 is closer to the outer area of ​​the battery compartment 101a than the second center beam 132, the thickness of the first heat insulation board 141 is greater than the thickness of the second heat insulation board, thereby reducing the heat transferred from the heat exchange plate 121 to the outside of the battery compartment 101a.

[0131] According to some embodiments of the present application, a second heat insulation board (not shown) is further provided between the second center beam 132 and the heat exchange plate 121 , and along a direction perpendicular to the bottom plate 120 , the thickness of the first heat insulation board 141 is greater than the thickness of the second heat insulation board.

[0132] That is, even if battery cell groups are arranged on both sides of the second center beam 132 in the thickness direction, a second heat insulation plate can be arranged between the second center beam 132 and the heat exchange plate 121 to reduce the heat transferred from the heat exchange plate 121 to the second center beam 132 .

[0133] Since the first center beam 131 is closer to the outer area of ​​the first accommodating space 101 than the second center beam 132, the thickness of the first heat insulation board 141 is greater than the thickness of the second heat insulation board, thereby reducing the heat transferred from the heat exchange plate 121 to the outside of the battery compartment 101a.

[0134] According to some embodiments of the present application, there may be a plurality of middle beams 130, including a first middle beam 131 and a second middle beam 132, the first middle beam 131 is respectively connected to the surrounding frame 110 at both ends in the length direction to separate the accommodating space 101 into a battery compartment 101a and an electrical compartment 101b, and the second middle beam 132 is respectively connected to the surrounding frame 110 at both ends in the length direction to separate the battery compartment 101a;

[0135] A second heat insulation board is also provided between the second center beam 132 and the heat exchange plate 121. The second center beam 132 and the second heat insulation board are multiple and correspond to each other one by one. Along the direction perpendicular to the bottom plate 120, the ratio of the thickness of any two of the multiple second heat insulation boards is 0.9-1.1.

[0136] That is to say, the first center beam 131 is also the center beam 130 , and the second center beam 132 is also the center beam 130 . The above structural and parameter limitations on the center beam 130 can also be applied to the first center beam 131 and the second center beam 132 .

[0137] For example, the ratio of the thicknesses of any two of the plurality of second thermal insulation boards may be 0.9, 0.95, 1, 1.05, or 1.1.

[0138] In the above scheme, there are multiple second center beams 132 and second heat insulation plates, which correspond to each other one by one. The ratio of the thickness of any two of the multiple second heat insulation plates is 0.9-1.1, so that the thickness of the multiple second heat insulation plates is not much different, ensuring that heat can be evenly transferred to the multiple second center beams 132, thereby improving the temperature uniformity of the multiple battery cells.

[0139] According to some embodiments of the present application, a heat exchange channel 102 is provided in the heat exchange plate 121 , and along a direction perpendicular to the bottom plate 120 , a projection of the first heat insulation plate 141 does not overlap with a projection of the heat exchange channel 102 .

[0140] As a result, the heat transferred from the heat exchange plate 121 to the center beam 130 is further reduced, so that the heat of the heat exchange plate 121 is mainly transferred to the battery cells in the battery compartment 101a, thereby better adjusting the temperature of the battery cells.

[0141] According to some embodiments of the present application, the minimum distance between the projection of the first heat insulation plate 141 and the projection of the heat exchange channel 102 is S, which satisfies: 5mm≤S≤20mm.

[0142] The larger the minimum distance between the projection of the first heat insulation plate 141 and the projection of the heat exchange channel 102, the less likely the heat of the heat exchange plate 121 will be transferred to the first heat insulation plate 141; the smaller the minimum distance between the projection of the first heat insulation plate 141 and the projection of the heat exchange channel 102, the larger the effective heat exchange area of ​​the first heat insulation plate 141 for the battery cell.

[0143] For example, the minimum distance S between the projection of the first heat insulation plate 141 and the projection of the heat exchange channel 102 may be 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, 17 mm, 19 mm or 250 mm.

[0144] Therefore, on the one hand, the heat transferred from the heat exchange plate 121 to the first heat insulation plate 141 is further reduced. On the other hand, the problem of the flow channel area in the heat exchange plate 121 being too small due to the heat exchange channel 102 being too far away from the first heat insulation plate 141 will not occur, thereby ensuring that the heat exchange plate 121 can effectively regulate the temperature of the battery cell.

[0145] The following is a brief description of the battery of the embodiment of the present application.

[0146] The battery according to the embodiment of the present application includes the above-mentioned battery case 100 and a battery cell. The battery cell is disposed in the frame of the battery case 100 , and the heat exchange plate 121 of the battery case 100 is used for heat exchange for the battery cell.

[0147] Since the battery of the embodiment of the present application is provided with the above-mentioned battery case 100, the production efficiency of the battery is high and the stability of the battery is also significantly improved.

[0148] The following is a brief description of the electrical equipment in the embodiments of the present application.

[0149] The electric device according to the embodiment of the present application includes the above-mentioned battery, which is used to provide electric energy. Since the electric device according to the embodiment of the present application is provided with the above-mentioned battery, the production efficiency of the electric device is high, and the stability of the electric device is also significantly improved.

[0150] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0151] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0152] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

[0153] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery box, characterized in that: include: The frame is constructed in a ring shape; A bottom plate connected to the enclosure frame, wherein the bottom plate and the enclosure frame enclose a storage space, wherein the bottom plate comprises a heat exchange plate, and the heat exchange plate is arranged opposite to the storage space in a direction perpendicular to the bottom plate; A middle beam, wherein both ends of the middle beam in the length direction are respectively connected to the surrounding frames to separate the accommodation space; A first heat insulation board is arranged between the center beam and the heat exchange board, and the thermal conductivity of the first heat insulation board is smaller than the thermal conductivity of the heat exchange board; Among them, the center beam has a first top wall and a first bottom wall, the first top wall and the first bottom wall are both arranged parallel to the bottom plate, the first bottom wall is arranged toward the bottom plate, the first bottom wall, the first heat insulation plate and the heat exchange plate are fixedly connected by rivet connectors, and along the direction perpendicular to the bottom plate, the size of the first heat insulation plate is D1, the size of the heat exchange plate is D2, and the size of the first bottom wall is D3, satisfying: 0.14≤D1 / (D1+D2+D3)≤0.46, the D1 satisfies: 1mm≤D1≤2mm, and the (D1+D2+D3) satisfies: 4mm≤(D1+D2+D3)≤7mm.

2. The battery box according to claim 1, characterized in that: Along a direction perpendicular to the bottom plate, a ratio of a projected area of ​​the first heat insulation board to a projected area of ​​the center beam is not greater than 1.

2.

3. The battery box according to claim 1, characterized in that: Along a direction perpendicular to the bottom plate, the projection of the first heat insulation board falls within the projection of the middle beam; Along a first direction, a size of a projection of the first heat insulation board is smaller than a size of a projection of the center beam, and the first direction, a length direction of the center beam, and a direction perpendicular to the bottom plate are perpendicular to each other.

4. The battery box according to claim 3, characterized in that: Along the first direction, the projection of the first heat insulation board has a first edge and a second edge, and the projection of the center beam has a third edge and a fourth edge; Along the first direction, the first edge and the third edge are located on the same side and the distance between the first edge and the third edge is not greater than 5 mm, and the second edge and the fourth edge are located on the same side and the distance between the second edge and the fourth edge is not greater than 5 mm.

5. The battery box according to claim 1, characterized in that: Along a direction perpendicular to the bottom plate, the projection of the first heat insulation board falls within the projection of the middle beam; Along a first direction, a size of a projection of the first heat insulation board is equal to a size of a projection of the middle beam, and the first direction, a length direction of the middle beam and a direction perpendicular to the bottom plate are perpendicular to each other.

6. The battery box according to claim 1, characterized in that: The accommodating space includes a battery compartment and an electrical compartment, and the middle beam is used to separate the battery compartment from the electrical compartment, or / and, there are multiple battery compartments, and the middle beam is used to separate two adjacent battery compartments.

7. The battery case according to claim 6, characterized in that: The middle beam comprises a first middle beam, and the first middle beam is respectively connected to the surrounding frame at both ends in the length direction to separate the battery compartment and the electrical compartment; Along the first direction, the projection of the first heat insulation board in the direction perpendicular to the bottom plate has a first edge and a second edge, the projection of the first middle beam in the direction perpendicular to the bottom plate has a third edge and a fourth edge, the first edge and the third edge are both facing the electrical compartment, the second edge and the fourth edge are both facing the battery compartment, along the first direction, the first edge exceeds the third edge, the second edge does not exceed the fourth edge, the first direction, the length direction of the middle beam and the direction perpendicular to the bottom plate are perpendicular to each other.

8. The battery box according to claim 1, characterized in that: There are multiple pull rivet connectors, and the multiple pull rivet connectors are arranged at intervals; The first heat insulation board has a first through hole for the rivet connector to pass through, there are multiple first through holes and the multiple first through holes correspond one-to-one to the multiple rivet connectors, the number of the first through holes is N1, and satisfies: 2≤N1 / D1≤12.

9. The battery box according to claim 1, characterized in that: The first bottom wall and the first heat insulation board respectively have a first side surface and a second side surface contacting each other, and the first side surface and the second side surface are both configured as planes.

10. The battery box according to claim 1, characterized in that: A first adhesive layer is provided between the heat exchange plate and the first heat insulation plate. Along a direction perpendicular to the bottom plate, a size of the first adhesive layer is t, satisfying: 0.05 mm ≤ t ≤ 1 mm.

11. The battery case according to claim 10, characterized in that: The thermal conductivity of the first adhesive layer is greater than or equal to 0.38 W / (mK).

12. The battery case according to claim 1, characterized in that: Along the second direction, the enclosure frame includes a first side beam and a second side beam spaced apart from each other, two ends of the middle beam are respectively connected to the first side beam and the second side beam, and the second direction is parallel to the length direction of the middle beam; At least one of the first side beam and the second side beam is provided with a convex edge extending toward the accommodating space, and along a direction perpendicular to the bottom plate, a projection of the convex edge partially overlaps with a projection of the heat exchange plate.

13. The battery case according to claim 12, characterized in that: The convex edge includes a first convex edge and a second convex edge, the first convex edge is arranged on the first side beam, and the second convex edge is arranged on the second side beam. In a direction perpendicular to the bottom plate, the projection of the first convex edge partially overlaps with the projection of the heat exchange plate, and the projection of the second convex edge partially overlaps with the projection of the heat exchange plate.

14. The battery case according to claim 13, characterized in that: Along the second direction, two ends of the first heat insulation board are in contact with the first convex edge and the second convex edge respectively.

15. The battery case according to claim 13, characterized in that: Along the second direction, two ends of the first heat insulation board are respectively spaced apart from the first convex edge and the second convex edge by a distance E, satisfying: 3mm≤E≤7mm.

16. The battery case according to claim 15, characterized in that: Along a direction perpendicular to the bottom plate, the sides of the first convex edge and the second convex edge facing the first accommodation space both protrude beyond the side of the first heat insulation board facing the first accommodation space; In a direction perpendicular to the bottom plate, the middle beam protrudes toward the side portion of the heat exchange plate to contact the first heat insulation plate.

17. The battery case according to claim 1, characterized in that: The room temperature tensile strength of the first thermal insulation board is not less than 135 MPa.

18. The battery case according to claim 1, characterized in that: There are multiple middle beams, including a first middle beam and a second middle beam, the first middle beam is respectively connected to the surrounding frame at both ends in the length direction to separate the accommodating space into a battery compartment and an electrical compartment, and the second middle beam is respectively connected to the surrounding frame at both ends in the length direction to separate the battery compartment; The first heat insulation plate is arranged between the first center beam and the heat exchange plate, and the second center beam is in contact with the heat exchange plate; or, the first heat insulation plate is arranged between the first center beam and the heat exchange plate, and the second heat insulation plate is further arranged between the second center beam and the heat exchange plate, and along the direction perpendicular to the bottom plate, the thickness of the first heat insulation plate is greater than the thickness of the second heat insulation plate.

19. The battery case according to claim 1, characterized in that: There are multiple middle beams, including a first middle beam and a second middle beam, the first middle beam is respectively connected to the surrounding frame at both ends in the length direction to separate the accommodating space into a battery compartment and an electrical compartment, and the second middle beam is respectively connected to the surrounding frame at both ends in the length direction to separate the battery compartment; A second heat insulation plate is also arranged between the second center beam and the heat exchange plate. The second center beam and the second heat insulation plates are multiple and correspond to each other one by one. Along the direction perpendicular to the bottom plate, the ratio of the thickness of any two of the multiple second heat insulation plates is 0.9-1.

1.

20. The battery case according to claim 1, characterized in that: The heat exchange plate has a heat exchange channel therein, and along a direction perpendicular to the bottom plate, a projection of the first heat insulation plate does not overlap with a projection of the heat exchange channel.

21. The battery case according to claim 20, characterized in that: The minimum distance between the projection of the first heat insulation plate and the projection of the heat exchange channel is S, which satisfies: 5mm≤S≤20mm.

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