Battery case

Abstract

The present application relates to the technical field of batteries, and discloses a battery case, comprising a surrounding frame, a bottom plate, a middle beam, and a first heat insulation plate. The surrounding frame is configured to be annular. The bottom plate is connected to the surrounding frame. The bottom plate and the surrounding frame define an accommodating space. The bottom plate comprises a heat exchange plate. In a direction perpendicular to the bottom plate, the heat exchange plate and the accommodating space are arranged opposite to each other. Two ends of the middle beam in a length direction are respectively connected to the surrounding frame so as to partition the accommodating space. The first heat insulation plate is arranged between the middle beam and the heat exchange plate. A thermal conductivity coefficient of the first heat insulation plate is less than that of the heat exchange plate. 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 facing the bottom plate. The first bottom wall, the first heat insulation plate, and the heat exchange plate are fixedly connected by means of riveting connectors. In the direction perpendicular to the bottom plate, the dimension of the first heat insulation plate is D1, the dimension of the heat exchange plate is D2, and the dimension of the first bottom wall is D3, and the following condition is met: 0.14≤D1 / (D1+D2+D3)≤0.46.

Description

Battery box

[0001] This application claims priority to Chinese Patent Application No. 202411427507.5, filed on October 14, 2024, entitled "Battery Housing", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery housing. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0004] Battery reliability is a crucial factor in battery manufacturing. Therefore, improving battery reliability is a pressing technical challenge in battery technology. Summary of the Invention

[0005] This application provides a battery housing, a battery, and an electrical device. The technical solution of this application can improve the reliability of the battery.

[0006] To achieve the above objectives, the main technical solutions adopted in this application include:

[0007] This application provides a battery housing, including a frame, a base plate, a central beam, and a first heat insulation plate. The frame is annular. The base plate is connected to the frame, and the base plate and the frame enclose a receiving space. The base plate includes a heat exchange plate, which is disposed opposite to the receiving space along a direction perpendicular to the base plate. The central beam is connected to the frame at both ends along its length to separate the receiving space. The first heat insulation plate is disposed between the central beam and the heat exchange plate, and the thermal conductivity of the first heat insulation plate is less than that of the heat exchange plate. The thermal conductivity of the hot 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 facing the bottom plate, the first bottom wall, the first heat insulation plate and the heat exchange plate are fixedly connected by a riveting connector, 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.

[0008] In the above scheme, the first bottom wall, the first heat insulation plate, and the heat exchange plate are fixedly connected by riveting connectors, which allows for quick and simple fixation of the first bottom wall, the first heat insulation plate, and the heat exchange plate. This simple operation saves time and effort, improving battery production efficiency. Simultaneously, the dimensions of the first heat insulation plate are D1, the heat exchange plate is D2, and the thickness of the first bottom wall is D3, satisfying: 0.14≤D1 / (D1+D2+D3)≤0.46. This ensures, on the one hand, that the first heat insulation plate has sufficient structural strength, reducing the probability of it being crushed during the riveting process, thus improving the reliability of the battery casing; on the other hand, it prevents the first heat insulation plate from being excessively thick, reducing the likelihood that the riveting force will be insufficient to seal the heat exchange plate and the central beam. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 is a schematic diagram of a vehicle according to some embodiments of this application;

[0011] Figure 2 is a perspective view of the battery box in some embodiments of this application;

[0012] Figure 3 is a top view of a single battery cell in some embodiments of this application;

[0013] Figure 4 is a cross-sectional view of Figure 3 along the AA direction;

[0014] Figure 5 is a magnified view of a portion of circled D in Figure 4;

[0015] Figure 6 is a cross-sectional view of Figure 3 along the BB direction;

[0016] Figure 7 is a partially enlarged schematic diagram of circle E in Figure 6;

[0017] Figure 8 is a partially enlarged schematic diagram of circle F in Figure 6;

[0018] Figure 9 is a cross-sectional view of Figure 3 along the CC direction;

[0019] Figure 10 is a partially enlarged schematic diagram of circle G in Figure 9.

[0020] Reference numerals: Battery housing 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, central beam 130, first top wall 130a, first bottom wall 130b, first central beam 131, second central beam 132, first heat insulation plate 141, accommodating space 101, battery compartment 101a, electrical compartment 101b, riveted connector 160, first protruding edge 111a, second protruding edge 112a. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0023] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0026] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0027] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0028] In some embodiments, the battery can be a battery pack, which includes a battery housing and individual battery cells, with the individual battery cells or battery modules housed within the battery housing.

[0029] In some embodiments, the battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0030] In recent years, electric vehicles have experienced rapid development. In this field, batteries, as the power source, play an irreplaceable and crucial role. As a core component of electric vehicles, batteries have high requirements for stability.

[0031] Currently, in battery housings, a heat insulation section is typically installed between the central beam and the heat exchange plate to reduce the rate of heat transfer. The heat exchange plate, heat insulation section, and central beam can be fixedly connected by threaded fasteners or welding. However, using threaded fasteners or welding is cumbersome, time-consuming, and labor-intensive, resulting in low production efficiency for battery housings.

[0032] In view of this, in order to improve the production efficiency of the battery box while also taking into account the structural stability of the battery box, some embodiments of this application provide a battery box, which includes a frame, a base plate, a central beam and a first heat insulation plate.

[0033] The frame structure is ring-shaped, with a base plate connected to the frame, forming an enclosing space. The base plate includes a heat exchange plate, which is positioned opposite the enclosing space along a direction perpendicular to the base plate. A central beam is connected to the frame at both ends along its length to separate the enclosing space. A first heat insulation plate is positioned between the central beam and the heat exchange plate, and the thermal conductivity of the first heat insulation plate is less than that of the heat exchange plate. The central beam has a first top wall and a first bottom wall, both of which are parallel to the base plate, with the first bottom wall facing the base plate. The first bottom wall, the first heat insulation plate, and the heat exchange plate are fixedly connected by rivet connectors. Along a direction perpendicular to the base plate, the dimensions of the first heat insulation plate are D1, the heat exchange plate is D2, and the first bottom wall is D3, satisfying: 0.14≤D1 / (D1+D2+D3)≤0.46.

[0034] In the above scheme, the first bottom wall, the first heat insulation plate, and the heat exchange plate are fixedly connected by riveting connectors, which allows for quick and simple fixation of the first bottom wall, the first heat insulation plate, and the heat exchange plate. This simple operation saves time and effort, improving battery production efficiency. Simultaneously, the dimensions of the first heat insulation plate are D1, the heat exchange plate is D2, and the thickness of the first bottom wall is D3, satisfying: 0.14≤D1 / (D1+D2+D3)≤0.46. This ensures, on the one hand, that the first heat insulation plate has sufficient structural strength, reducing the probability of it being crushed during the riveting process, thus improving the reliability of the battery casing; on the other hand, it prevents the first heat insulation plate from being excessively thick, reducing the likelihood that the riveting force will be insufficient to seal the heat exchange plate and the central beam.

[0035] The battery disclosed in this application can be used, but is not limited to, in vehicles, and can also be used in other electrical devices with structural beams, wherein the battery is able to avoid the structural beams of other electrical devices.

[0036] The battery disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft that have longitudinal beams and are designed to allow the battery to avoid these structural beams. A power system for such an electrical device can be constructed using the battery disclosed in this application.

[0037] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, heavy trucks, buses, spacecraft, etc. Among them, electric toys can include stationary 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.

[0038] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0039] Please refer to Figure 1, which is a schematic diagram of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The type of vehicle 1000 can be a sedan, SUV, heavy truck, or bus, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0040] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0041] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0042] This application provides a battery housing in some embodiments. Please refer to Figures 2-9. Figure 2 is a perspective view of the battery housing in some embodiments of this application. Figure 3 is a top view of a single battery cell in some embodiments of this application. Figure 4 is a cross-sectional view of Figure 3 along the AA direction. Figure 5 is a partial enlarged view of circled D in Figure 4. Figure 6 is a cross-sectional view of Figure 3 along the BB direction. Figure 7 is a partial enlarged schematic diagram of circled E in Figure 6. Figure 8 is a partial enlarged schematic diagram of circled F in Figure 6. Figure 9 is a cross-sectional view of Figure 3 along the CC direction. Figure 10 is a partial enlarged schematic diagram of circled G in Figure 9.

[0043] According to an embodiment of this application, the battery box 100 may include a frame 110, a base plate 120, a central beam 130, and a first heat insulation plate 141.

[0044] As the name suggests, the frame 110 and the base plate 120 form the frame structure of the battery box 100. The battery cells or electrical components inside the battery box 100 can be directly or indirectly installed on the frame 110 and the base plate 120.

[0045] The frame 110 can be made of metal, such as steel, to ensure that the frame 110 has sufficient structural strength.

[0046] The frame 110 can be constructed as a ring structure. For example, the frame 110 may 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 may be arranged opposite each other in one direction, and the third side beam 113 and the fourth side beam 114 may be arranged opposite each other in another direction.

[0047] The base plate 120 is connected to the frame 110. For example, along the thickness direction of the base plate 120, the base plate 120 can be fixedly connected to the frame 110, and the base plate 120 and the frame 110 enclose a receiving space 101. This receiving space 101 can be a space for accommodating a single battery cell or a space for accommodating electrical components, and this application does not limit it.

[0048] The base plate 120 includes a heat exchange plate 121. The heat exchange plate 121 is disposed opposite to the housing space 101 in a direction perpendicular to the base plate 120. The heat exchange plate 121 can exchange heat with the battery cells in the housing space 101, thereby adjusting the temperature of the battery cells and ensuring that the battery cells are at a suitable operating temperature.

[0049] The central beam 130 is connected to the frame 110 at both ends along its length. The central beam 130 is disposed within the space enclosed by the frame 110 and the base plate 120 (i.e., the accommodating space 101). Thus, the central beam 130 can divide the accommodating space 101, which can be divided into spaces for accommodating battery cells and spaces for accommodating electrical components, etc. This application does not specifically limit the division of this space. For example, the central beam 130 can be connected to the first side beam 111 and the second side beam 112 at both ends along its length.

[0050] The heat exchange plate 121 can be connected to the frame 110, and is arranged opposite to the receiving space 101 in a direction perpendicular to the base plate 120. It should be noted that the direction perpendicular to the base plate 120 is also the thickness direction of the base plate 120.

[0051] A battery cell can be installed in the housing space 101. Meanwhile, the heat exchange plate 121 is arranged opposite to the housing space 101 in a direction perpendicular to the base 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 work at a suitable temperature.

[0052] Along the direction perpendicular to the base plate 120, the first heat insulation plate 141 is disposed between the middle beam 130 and the heat exchange plate 121. The first heat insulation plate 141 can separate the middle beam 130 and the heat exchange plate 121, so that the heat exchange plate 121 will not directly contact the middle beam 130.

[0053] Meanwhile, the thermal conductivity of the first heat insulation plate 141 is less than that of the heat exchange plate 121, thereby reducing the heat transferred from the heat exchange plate 121 to the central beam 130, thus maximizing the heat exchange between the heat exchange plate 121 and the battery cells.

[0054] In the embodiments of this application, the central 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 in other words, 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 arranged opposite each other in a direction perpendicular to the bottom plate 120.

[0055] The first bottom wall 130b, the first heat insulation plate 141, and the heat exchange plate 121 are fixedly connected by a rivet connector 160, which allows the first bottom wall 130b, the first heat insulation plate 141, and the heat exchange plate 121 to be fixed quickly and easily. The operation is simple, time-saving, and labor-saving, thus improving the production efficiency of the battery.

[0056] Along the thickness direction of the frame, the dimensions of the first heat insulation plate 141 are D1, the dimensions of the heat exchange plate 121 are D2, and the thickness of the first bottom wall 130b is D3, satisfying: 0.14≤D1 / (D1+D2+D3)≤0.46.

[0057] The rivet connector 160 needs to pass through the first bottom wall 130b, the first heat 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 heat insulation plate 141 within the fixed thickness.

[0058] 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. This application does not limit the specific value of D1 / (D1+D2+D3), as long as D1 / (D1+D2+D3) meets the above range.

[0059] Generally speaking, the larger the size D1 of the first heat insulation plate 141, the better its structural strength. Since 0.14≤D1 / (D1+D2+D3)≤0.46, on the one hand, it ensures that the first heat insulation plate 141 has sufficient structural strength, reducing the probability of the first heat insulation plate 141 being crushed during the riveting process. It also reduces the probability that the heat insulation effect of the first heat insulation plate 141 will be poor due to the size D1 being too small, thereby improving the reliability of the battery box 100. On the other hand, the thickness of the first heat insulation plate 141 is not too thick, reducing the probability that the riveting force is insufficient to seal the heat exchange plate 121 and the central beam 130.

[0060] According to some embodiments of this application, D1 satisfies: 1mm≤D1≤2mm, and (D1+D2+D3) satisfies: 4mm≤(D1+D2+D3)≤7mm.

[0061] For example, the size D1 of the first heat insulation plate 141 can be 1mm, 1.25mm, 1.5mm, 1.75mm, or 2mm. This ensures that the first heat insulation plate 141 has the effect of blocking heat transfer, while also reducing the probability of the overall energy density of the battery being lower due to the excessive thickness of the first heat insulation plate 141.

[0062] (D1+D2+D3) can be 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm or 7mm. This 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 this application.

[0063] Therefore, on the one hand, the dimensions 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 are sufficient to provide enough strength to support the riveted connector. On the other hand, the dimensions 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 are not too large, thereby significantly reducing the overall energy density of the battery.

[0064] In some embodiments of this application, the size of the first heat insulation plate 141 along the direction perpendicular to the base plate 120 can be 1mm-2mm. For example, the size D1 of the first heat insulation plate 141 can be 1mm, 1.25mm, 1.5mm, 1.75mm, or 2mm. This ensures that the first heat insulation plate 141 effectively blocks heat transfer while also reducing the likelihood of a decrease in the overall energy density of the battery due to excessive thickness of the first heat insulation plate 141.

[0065] Along the direction perpendicular to the base plate 120, the dimension D2 of the heat exchange plate 121 can be 1.8mm-2.4mm. For example, the dimension of the heat exchange plate 121 can be 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, or 2.4mm. This improves the structural strength of the heat exchange plate 121 while ensuring sufficient heat exchange capacity.

[0066] Along the direction perpendicular to the base plate 120, the dimensions of the first bottom wall 130b can be 1.6mm-2.5mm. For example, the dimensions 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. This ensures that the first bottom wall 130b has sufficient structural strength, while preventing situations where the dimensions of the first bottom wall 130b in the direction perpendicular to the base plate 120 are too large, which could lead to difficulties in riveting or a significant reduction in the energy density of the battery.

[0067] In addition, in this application, the direction perpendicular to the base plate 120 is represented by X in the accompanying drawings, the first direction is represented by Y, and the second direction is represented by Z.

[0068] In some embodiments of this application, the ratio of the projected area of ​​the first heat insulation plate 141 to the projected area of ​​the middle beam 130 along the direction perpendicular to the base plate 120 is not greater than 1.2. For example, the ratio of the projected area of ​​the first heat insulation plate 141 to the projected area of ​​the middle beam 130 can be 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, etc.

[0069] In other words, along the direction perpendicular to the base plate 120, the projected area of ​​the first heat insulation plate 141 can be less than or equal to the projected area of ​​the middle beam 130. This ensures both the stability and sealing of the connection between the first heat insulation plate 141 and the middle beam 130, and also prevents the first heat insulation plate 141 from extending excessively into the sub-cavities formed by the middle beam 130 separating the accommodating space 101. In fact, the first heat insulation plate may not even extend into the sub-cavities formed by the middle beam separating the accommodating space 101, reducing the probability of interference between the first heat insulation plate and the battery cells or electrical components in the sub-cavities.

[0070] Of course, along the direction perpendicular to the base plate 120, the projected area of ​​the first heat insulation plate 141 can be larger than the projected area of ​​the central beam 130. Therefore, a portion of the first heat insulation plate 141 can extend into the sub-cavity separated by the central beam 130. It should be noted that the portion of the first heat insulation plate 141 extending into the sub-cavity separated by the central beam 130 is the electrical compartment 101b, which houses electrical components. The first heat insulation plate 141 will not extend into the battery compartment 101a, which houses individual battery cells.

[0071] In some embodiments of this application, the projection of the first heat insulation plate 141 falls within the projection of the central beam 130 along a direction perpendicular to the base plate 120. Therefore, in a direction perpendicular to the base plate 120, the first heat insulation plate 141 does not protrude from the central beam 130, thus preventing interference between the first heat insulation plate 141 and components within the multiple sub-cavities separated by the central beam 130, and also preventing interference with the frame.

[0072] Along the first direction, the projected size of the first heat insulation plate 141 is smaller than the projected size of the middle beam 130, and the first direction, the length direction of the middle beam 130, and the thickness direction of the base plate 120 are perpendicular to each other. The middle beam 130 divides the receiving space 101 in the first direction, thereby dividing the receiving space 101 into multiple sub-chambers. Since the projected size of the first heat insulation plate 141 is smaller than the projected size of the middle beam 130 along the first direction, the first heat insulation plate 141 will not extend into the sub-chambers, reducing the probability of the first heat insulation plate 141 interfering with the battery cells or electrical components in the sub-chambers.

[0073] According to some embodiments of this application, along a first direction, the projection of the first heat insulation plate 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.

[0074] Along the first direction, the first edge and the third edge are on the same side and the distance between the first edge and the third edge is no greater than 5mm, and the second edge and the fourth edge are on the same side and the distance between the second edge and the fourth edge is no greater than 5mm.

[0075] 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 no greater than 5mm, and the distance between the second edge and the fourth edge is no greater than 5mm, on the one hand, along the first direction, it is ensured that neither end of the first heat insulation plate 141 extends into the corresponding sub-cavity. On the other hand, it is ensured that the size of the first heat insulation plate 141 is not too small, so that the heat insulation effect and sealing effect are insufficient.

[0076] According to some embodiments of this application, along the direction perpendicular to the base plate 120, the projection of the first heat insulation plate 141 falls into the projection of the middle beam 130; along the first direction, the size of the projection of the first heat insulation plate 141 is equal to the size of the projection of the middle beam 130, and the first direction, the length direction of the middle beam 130 and the direction perpendicular to the base plate 120 are perpendicular to each other.

[0077] In the above scheme, the central beam 130 divides the accommodating space 101 in the first direction, thereby dividing the accommodating space 101 into multiple sub-chambers. Since the projected size of the first heat insulation plate 141 along the first direction is equal to the projected size of the central beam 130, the two ends of the first heat insulation plate 141 in the first direction can be flush with the two ends of the central beam 130 in the first direction. The first heat insulation plate 141 will not extend into the sub-chamber, reducing the probability of the first heat insulation plate 141 interfering with the battery cells or electrical components in the sub-chamber.

[0078] In some embodiments of this application, the accommodating space 101 includes a battery compartment 101a and an electrical compartment 101b, and a central beam 130 is used to separate the battery compartment 101a and the electrical compartment 101b. That is, the central beam 130 has the battery compartment 101a on one side in the thickness direction and the electrical compartment 101b on the other side.

[0079] In other embodiments, there are multiple battery compartments 101a, and a central beam 130 is used to separate two adjacent battery compartments 101a. That is, the central beam 130 has a battery compartment 101a on one side and a battery compartment 101a on the other side in the thickness direction.

[0080] In other embodiments, there are multiple battery compartments 101a, with a portion of the central beam 130 used to separate the battery compartments 101a and the electrical compartments 101b. That is, this portion of the central beam 130 has a battery compartment 101a on one side and an electrical compartment 101b on the other side in the thickness direction. Another portion of the central beam 130 is used to separate two adjacent battery compartments 101a. That is, this portion of the central beam 130 has a battery compartment 101a on one side and a battery compartment 101a on the other side in the thickness direction.

[0081] According to some embodiments of this application, the central beam 130 includes a first central beam 131, which is 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 plate 141 in the direction perpendicular to the bottom plate 120 has a first edge and a second edge, and the projection of the first central 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 both face the electrical compartment 101b, and the second edge and the fourth edge both face the battery compartment 101a. Along the first direction, the first edge extends beyond the third edge, and the second edge does not extend beyond the fourth edge. The first direction, the length direction of the central beam, and the direction perpendicular to the bottom plate 120 are perpendicular to each other.

[0082] It is understandable that the direction of the treatment relative to the base plate 120 is the same as the thickness direction of the base plate.

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

[0084] In some embodiments of this application, the material of the first heat insulation plate 141 may include epoxy resin. For example, the first heat insulation plate 141 may be an epoxy resin component, thereby giving the first heat insulation plate 141 good heat insulation ability and effectively reducing the heat transferred from the heat exchange plate 121 to the central beam 130.

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

[0086] The first heat insulation plate 141 has a first through hole for the riveting connector 160 to pass through. There are multiple first through holes, and each of the multiple first through holes corresponds to a multiple of the first riveting connectors 160. As a result, the multiple riveting connectors 160 can more firmly fix the central beam 130, the first heat insulation plate 141 and the heat exchange plate 121 together.

[0087] For example, the first heat insulation plate 141 can be a single long strip, and the first heat insulation plate 141 is fixed to the central beam 130 by multiple rivet connectors 160. Thus, on the one hand, the assembly efficiency is higher when the first heat insulation plate 141 is a single long strip compared to when the first heat insulation plate 141 is divided into multiple small parts; on the other hand, the heat insulation effect is also better when the first heat insulation plate 141 is a single long strip.

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

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

[0090] For example, N1 / D1 can be 2, 4, 6, 8, 10, or 12. This 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 this application. It should be noted that the thickness of the first heat insulation plate 141 in this application is in millimeters.

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

[0092] In some embodiments of this 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 a first heat insulation plate 141 is disposed between the first heat exchange plate 121a and the central beam 130; the first heat exchange plate 121 is constructed as a flat plate structure, and a heat exchange flow channel is provided inside the second heat exchange plate 121.

[0093] The materials of the first heat exchange plate 121a and the second heat exchange plate 121b can be the same, or the thermal conductivity of the first heat exchange plate 121a and the second heat exchange plate 121b can be the same. This allows 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 has a flat plate structure without grooves. This simplifies its forming and, compared to an uneven structure, results in a shorter heat transfer path. Furthermore, because of its flat plate structure, the first heat exchange plate 121a acts as a heat spreader, allowing for uniform heat transfer to the battery cells and reducing temperature differences between different areas of the battery cells.

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

[0096] In other words, the sides of the first bottom wall 130b and the first heat insulation plate 141 that come into contact with each other are both flat. This makes the first wall and the first heat insulation plate 141 fit together more stably. On the other hand, the sides of the first bottom wall 130b and the first heat insulation plate 141 that face each other do not have grooves, making them easy to form.

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

[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 and improving the sealing performance of the battery box 100.

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

[0100] The larger the size t of the first adhesive layer, the more firmly 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, the less likely the adhesive material is to enter the battery compartment 101a, thereby reducing the impact on the battery cells inside the battery compartment 101a.

[0101] For example, the dimension 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, or 1mm. This application does not limit the specific value of the first adhesive layer; as long as the dimension t of the first adhesive layer meets the above range, it is within the protection scope of this application.

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

[0103] In some embodiments of this 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 this application, the thermal conductivity of the first adhesive layer can be measured using the test standard GB / T 10297-2015.

[0104] Therefore, on the one hand, it ensures that the first adhesive layer has sufficient heat insulation effect, reducing the heat transfer rate in the first adhesive layer; on the other hand, it also ensures that the material selection for the first adhesive layer has sufficient substitutability, reducing the cost of using the first adhesive layer. Of course, when using an adhesive with poor thermal conductivity in the first adhesive layer, it is necessary to ensure sufficient bonding strength.

[0105] In some embodiments of this application, along the second direction, the frame 110 includes a spaced first side beam 111 and a second side beam 112, and the two 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 protruding edge extending toward the receiving space 101, and the projection of the protruding edge overlaps with the projection of the heat exchange plate 121 in a direction perpendicular to the bottom plate 120.

[0107] In other words, either the first side beam 111 or the second side beam 112 may be provided with a protruding edge, or both the first side beam 111 and the second side beam 112 may be provided with a protruding edge.

[0108] In the above solution, since at least one of the first side beam 111 and the second side beam 112 of this application is provided with a convex edge, and the projection of the convex edge overlaps with the projection of the heat exchange plate 121 in the direction perpendicular to the bottom plate 120, the first side beam 111 or / and the second side beam 112 can be conveniently fixedly connected to the heat exchange plate 121, thereby improving the connection efficiency and connection effect.

[0109] According to some embodiments of this application, the convex edge includes a first convex edge 111a and a second convex edge 112a. 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. Along the direction perpendicular to the bottom plate 120, the projection of the first convex edge 111a overlaps with the projection of the heat exchange plate 121, and the projection of the second convex edge 112a overlaps with the projection of the heat exchange plate 121.

[0110] Since the first side beam 111 and the second side beam 112 of this application are respectively provided with a first protruding edge 111a and a second protruding edge 112a, and along the direction perpendicular to the bottom plate 120, the projection of the first protruding edge 111a overlaps with the projection of the heat exchange plate 121, and the projection of the second protruding edge 112a 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 protruding edge 111a and the heat exchange plate 121 can be fixedly connected by friction welding, and the second protruding edge 112a and the heat exchange plate 121 can also be fixedly connected by friction welding.

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

[0113] Since the first heat insulation plate 141 is connected to the first convex edge 111a and the second convex edge 112a at both ends in the second direction, on the one hand, the heat insulation effect of the first heat insulation plate 141 is better, which can effectively block the heat transferred from the heat exchange plate 121 to the middle beam 130. On the other hand, the sealing performance of the first heat insulation plate 141 is better, making it less likely for dust, impurities or condensate to enter between the middle beam 130 and the heat exchange plate 121.

[0114] In some embodiments of this application, along the second direction, the two ends of the first heat insulation plate 141 are spaced apart from the first convex edge 111a and the second convex edge 112a respectively, and the distance between them is E, which satisfies: 3mm≤E≤7mm.

[0115] For example, along the second direction, the distance between the first convex edge 111a and the first heat insulation plate 141, and the distance between the second convex edge 112a and the first heat insulation plate 141 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm and 7mm.

[0116] Since the two ends of the first heat insulation plate 141 are spaced apart from the first convex edge 111a and the second convex edge 112a respectively along the second direction, the probability of the first heat insulation plate 141 being squeezed by the expansion due to the temperature rise of the first heat insulation plate 141 is reduced, 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 this application, along a direction perpendicular to the base plate 120, the first protruding edge 111a and the second protruding edge 112a both protrude from the side of the first heat insulation plate 141 facing the receiving space 101; along a direction perpendicular to the base plate 120, the first side portion facing the heat exchange plate 121 protrudes to contact the first heat insulation plate 141.

[0118] Meanwhile, since the bottom of the central beam 130 not only contacts the sides of the first convex edge 111a and the second convex edge 112a facing the first receiving space 101, but also contacts the side of the first heat insulation plate 141 facing the first receiving space 101, the middle region of the bottom of the central beam 130 protrudes more than the two end regions along the length of the central beam 130. The protruding middle region contacts the first heat insulation plate 141, while the two end regions contact the first convex edge 111a and the second convex edge 112a, respectively.

[0119] In other words, stepped sections are formed in the middle area and at both ends. Consequently, along the length of the central beam 130, the first protruding edge 111a and the second protruding edge 112a are respectively positioned opposite the protruding middle area. This results in a more stable connection between the central beam 130 and the frame 110, and a higher overall strength for the battery box 100.

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

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

[0122] Therefore, on the one hand, it can be ensured that the first heat insulation plate 141 has sufficient hardness and sufficient support strength under the riveting process. On the other hand, it can be ensured that the first heat insulation plate 141 has a certain deformation, reducing the probability that the first heat insulation plate 141 will be easily crushed due to excessive hardness.

[0123] According to some embodiments of this application, the central beam 130 includes a first central beam 131 and a second central beam 132. The first central beam 131 is connected to the frame 110 at both ends in the length direction to divide the accommodating space 101 into a battery compartment 101a and an electrical compartment 101b. The second central beam 132 is connected to the frame 110 at both ends in the length direction to separate the battery compartment 101a.

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

[0125] The battery compartment 101a can contain multiple individual battery cells, and the electrical compartment 101b can contain electrical components, such as a battery management system.

[0126] The first central beam 131 has an electrical compartment 101b and a battery compartment 101a on both sides of its thickness direction, and the second central beam 132 has a battery compartment 101a on both sides of its thickness direction.

[0127] 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 central beam 131 and the heat exchange plate 121, the heat exchange between the heat exchange plate 121 and the first central beam 131 can be reduced, and the transfer of heat to the space outside the battery compartment 101a can be reduced.

[0128] In addition, a second heat insulation plate is provided between the second central beam 132 and the heat exchange section, so that the heat of the heat exchange plate 121 can be transferred to the second central beam 132. However, since battery cells are provided on both sides of the second central beam 132 in the thickness direction, the heat can also be indirectly transferred to the battery cells.

[0129] Along the direction perpendicular to the base plate 120, the thickness of the first heat insulation plate 141 is greater than the thickness of the second heat insulation plate. Since the first central beam 131 is closer to the outer region of the battery compartment 101a than the second central beam 132, making the thickness of the first heat insulation plate 141 greater than the thickness of the second heat insulation plate reduces the heat transferred from the heat exchange plate 121 to the outside of the battery compartment 101a.

[0130] According to some embodiments of this application, a second heat insulation plate (not shown) is also provided between the second central beam 132 and the heat exchange plate 121. Along the direction perpendicular to the bottom plate 120, the thickness of the first heat insulation plate 141 is greater than the thickness of the second heat insulation plate.

[0131] In other words, even if battery cells are provided on both sides of the second central beam 132 in the thickness direction, a second heat insulation plate can be provided between the second central beam 132 and the heat exchange plate 121 to reduce the heat transferred from the heat exchange plate 121 to the second central beam 132.

[0132] Since the first central beam 131 is closer to the outer region of the first accommodating space 101 than the second central beam 132, the thickness of the first heat insulation plate 141 is made greater than the thickness of the second heat insulation plate, thereby reducing the heat transferred from the heat exchange plate 121 to the outside of the battery compartment 101a.

[0133] According to some embodiments of this application, the central beam 130 includes a first central beam 131 and a second central beam 132. The first central beam 131 is connected to the frame 110 at both ends in the length direction to divide the accommodating space 101 into a battery compartment 101a and an electrical compartment 101b. The second central beam 132 is connected to the frame 110 at both ends in the length direction to separate the battery compartment 101a.

[0134] A second heat insulation plate is also provided between the second central beam 132 and the heat exchange section. There are multiple second central beams 132 and heat exchange sections, and they correspond one-to-one with each other. Along the direction perpendicular to the bottom plate 120, the thickness ratio of any two of the multiple second heat insulation plates is 0.9-1.1.

[0135] For example, the thickness ratio of any two of the multiple second insulation panels can be 0.9, 0.95, 1, 1.05, or 1.1.

[0136] In the above scheme, there are multiple second central beams 132 and multiple second heat insulation plates, and they correspond one-to-one with each other. The thickness ratio of any two of the multiple second heat insulation plates is 0.9-1.1, so the thickness difference of the multiple second heat insulation plates is not large, ensuring that heat can be evenly transferred to the multiple second central beams 132, thereby improving the temperature uniformity of multiple battery cells.

[0137] According to some embodiments of this application, the heat exchange plate 121 has a heat exchange channel 102, and the projection of the first heat insulation plate 141 does not overlap with the projection of the heat exchange channel 102 in a direction perpendicular to the base plate 120.

[0138] This further reduces the heat transferred from the heat exchange plate 121 toward the central beam 130, allowing the heat from the heat exchange plate 121 to be mainly transferred to the battery cells inside the battery compartment 101a, thereby better regulating the temperature of the battery cells.

[0139] According to some embodiments of this 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.

[0140] The greater 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 from the heat exchange plate 121 is to 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.

[0141] 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 can be 5mm, 7mm, 9mm, 11mm, 13mm, 15mm, 17mm, 19mm or 250mm.

[0142] Therefore, on the one hand, the heat transferred from the heat exchange plate 121 to the first heat insulation plate 141 is further reduced, and on the other hand, the problem of the flow channel area in the heat exchange plate 121 being too small due to the large distance between the heat exchange flow channel 102 and the first heat insulation plate 141 is avoided, thus ensuring that the heat exchange plate 121 can effectively regulate the temperature of the battery cells.

[0143] The battery of the present application embodiment is briefly described below.

[0144] The battery according to the embodiments of this application includes the battery housing 100 and the battery cell described above. The battery cell is disposed in the frame of the battery housing 100, and the heat exchange plate 121 of the heat exchange section of the battery housing 100 is used to exchange heat for the battery cell.

[0145] Because the battery in this embodiment of the application is equipped with the battery housing 100 described above, the battery has high production efficiency and the battery stability is also significantly improved.

[0146] The electrical equipment of the present application embodiment is briefly described below.

[0147] The electrical device according to the embodiments of this application includes the battery described above, which is used to provide electrical energy. Because the electrical device of the embodiments of this application is equipped with the battery described above, the production efficiency of the electrical device is high, and the stability of the electrical device is also significantly improved.

[0148] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0149] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0150] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0151] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery case characterized by comprising: include: The frame is circular in shape. A base plate is connected to the frame, and the base plate and the frame enclose a receiving space. The base plate includes a heat exchange plate, which is arranged opposite to the receiving space along a direction perpendicular to the base plate. A central beam, which is connected to the surrounding frame at both ends along its length to separate the accommodating space; A first heat insulation plate is disposed between the central beam and the heat exchange plate, and the thermal conductivity of the first heat insulation plate is less than that of the heat exchange plate. The central beam has a first top wall and a first bottom wall, both of which are parallel to the base plate. The first bottom wall faces the base plate. The first bottom wall, the first heat insulation plate, and the heat exchange plate are fixedly connected by riveting connectors. In the direction perpendicular to the base 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.

2. The battery pack of claim 1, wherein The D1 satisfies: 1mm≤D1≤2mm, and the (D1+D2+D3) satisfies: 4mm≤(D1+D2+D3)≤7mm.

3. The battery pack of claim 1, wherein, Along a direction perpendicular to the base plate, the ratio of the projected area of ​​the first heat insulation plate to the projected area of ​​the middle beam is no greater than 1.

2.

4. The battery pack of claim 1, wherein, Along a direction perpendicular to the base plate, the projection of the first heat insulation plate falls into the projection of the middle beam; Along the first direction, the projected size of the first heat insulation plate is smaller than the projected size of the middle beam, and the first direction, the length direction of the middle beam, and the direction perpendicular to the bottom plate are all perpendicular to each other.

5. The battery pack of claim 4, wherein, Along the first direction, the projection of the first heat insulation plate has a first edge and a second edge, and the projection of the middle 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 no greater than 5mm, 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 no greater than 5mm.

6. The battery pack of claim 1, wherein, Along a direction perpendicular to the base plate, the projection of the first heat insulation plate falls into the projection of the middle beam; Along the first direction, the size of the projection of the first heat insulation plate is equal to the size of the projection of the middle beam, and the first direction, the length direction of the middle beam, and the direction perpendicular to the bottom plate are all perpendicular to each other.

7. The battery pack of claim 1, wherein, The accommodating space includes a battery compartment and an electrical compartment, and the central beam is used to separate the battery compartment from the electrical compartment, or / and, there are multiple battery compartments, and the central beam is used to separate two adjacent battery compartments.

8. The battery pack of claim 7, wherein, The central beam includes a first central beam, which is connected to the frame at both ends along its length to separate the battery compartment and the electrical compartment. Along the first direction, the projection of the first heat insulation plate in the direction perpendicular to the base plate has a first edge and a second edge, and the projection of the first central beam in the direction perpendicular to the base plate has a third edge and a fourth edge. The first edge and the third edge both face the electrical compartment, and the second edge and the fourth edge both face the battery compartment. Along the first direction, the first edge extends beyond the third edge, and the second edge does not extend beyond the fourth edge. The first direction, the length direction of the central beam, and the direction perpendicular to the base plate are all perpendicular to each other.

9. The battery pack of claim 1, wherein, There are multiple rivet connectors, and the multiple rivet connectors are arranged at intervals; The first heat insulation plate has a first through hole for the riveting connector to pass through. There are multiple first through holes and each of the multiple first through holes corresponds to one of the multiple first riveting connectors. The number of the first through holes is N1, which satisfies: 2≤N1 / D1≤12.

10. The battery pack of claim 1, wherein, The first bottom wall and the first heat insulation plate each have a first side and a second side that are in contact with each other, and both the first side and the second side are constructed as planes.

11. The battery pack of claim 1, wherein, A first adhesive layer is provided between the heat exchange plate and the first heat insulation plate. The size of the first adhesive layer is t, which satisfies the following condition: 0.05mm≤t≤1mm.

12. The battery pack of claim 11, wherein, The thermal conductivity of the first adhesive layer is greater than or equal to 0.38 W / (mK).

13. The battery pack of claim 1, wherein, Along the second direction, the frame includes a spaced first side beam and a second side beam, and the 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 protruding edge extending toward the receiving space, and the projection of the protruding edge overlaps with the projection of the heat exchange plate in a direction perpendicular to the bottom plate.

14. The battery pack of claim 13, wherein, The convex edge includes a first convex edge and a second convex edge. The first convex edge is disposed on the first side beam, and the second convex edge is disposed on the second side beam. Along the direction perpendicular to the bottom plate, the projection of the first convex edge overlaps with the projection of the heat exchange plate, and the projection of the second convex edge overlaps with the projection of the heat exchange plate.

15. The battery pack of claim 14, wherein, Along the second direction, the two ends of the first heat insulation plate are in contact with the first convex edge and the second convex edge, respectively.

16. The battery pack of claim 14, wherein, Along the second direction, the two ends of the first heat insulation plate are spaced apart from the first convex edge and the second convex edge respectively, and the distance between them is E, which satisfies: 3mm≤E≤7mm.

17. The battery pack of claim 16, wherein, Along the direction perpendicular to the base plate, the sides of the first convex edge and the second convex edge facing the first receiving space both protrude beyond the side of the first heat insulation plate facing the first receiving space; Along a direction perpendicular to the base plate, the middle beam protrudes towards the side portion of the heat exchange plate to contact the first heat insulation plate.

18. The battery pack of claim 1, wherein, The room temperature tensile strength of the first heat insulation board is not less than 135 MPa.

19. The battery pack of claim 1, wherein, The central beam includes a first central beam and a second central beam. The first central beam is connected to the frame at both ends in the length direction to divide the accommodating space into a battery compartment and an electrical compartment. The second central beam is connected to the frame at both ends in the length direction to separate the battery compartment. A first heat insulation plate is disposed between the first central beam and the heat exchange plate, and the second central beam is in contact with the heat exchange plate; or, a first heat insulation plate is disposed between the first central beam and the heat exchange plate, and a second heat insulation plate is disposed between the second central beam and the heat exchange section, wherein the thickness of the first heat insulation plate is greater than the thickness of the second heat insulation plate in a direction perpendicular to the bottom plate.

20. The battery pack of claim 19, wherein, The central beam includes a first central beam and a second central beam. The first central beam is connected to the frame at both ends in the length direction to divide the accommodating space into a battery compartment and an electrical compartment. The second central beam is connected to the frame at both ends in the length direction to separate the battery compartment. A second heat insulation plate is also provided between the second central beam and the heat exchange section. There are multiple second central beams and multiple second heat insulation plates, and they correspond one-to-one with each other. Along the direction perpendicular to the bottom plate, the thickness ratio of any two of the multiple second heat insulation plates is 0.9-1.

1.

21. The battery pack of claim 1, wherein, The heat exchange plate has a heat exchange channel, and the projection of the first heat insulation plate does not overlap with the projection of the heat exchange channel in a direction perpendicular to the base plate.

22. The battery pack of claim 19, wherein, 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.

Images