Battery pack and electric device

Abstract

The embodiment of the application provides a battery pack and an electric equipment, the battery pack comprises: a box body, an upper cover and a mounting assembly, the box body is provided with an accommodating cavity, the accommodating cavity has an opening, the upper cover is connected to the box body and blocks the opening, the mounting assembly is connected to one side of the upper cover away from the accommodating cavity in a first direction, wherein the mounting assembly is brazed and fixed with the upper cover. The flexibility of the position design of the mounting assembly in the embodiment of the application is better, and the matching flexibility of the battery pack and the battery pack installation space in the electric equipment is also improved, which helps to improve the reliability of the connection of the battery pack and the electric equipment.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and electrical equipment. Background Technology

[0002] With the development of new energy technologies, power battery packs are being used more and more widely in various electrical devices. Among them, battery packs are usually equipped with mounting structures for connecting with electrical devices.

[0003] In related technologies, the mounting structure of the battery pack needs to pass through the inside of the battery pack. However, due to the limitations of the complex internal structure of the battery pack, the design flexibility of the mounting structure position is poor. Furthermore, when the mounting structure position cannot be designed flexibly, it is difficult to match the limited battery pack installation space in the electrical equipment, and it is also difficult to ensure the reliability of the connection between the battery pack and the electrical equipment. Utility Model Content

[0004] This application aims to provide a battery pack and electrical equipment to solve the problem of poor flexibility in the design of existing battery pack mounting structures.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, this application discloses a battery pack, the battery pack comprising:

[0007] A housing, wherein the housing is provided with a receiving cavity, and the receiving cavity has an opening;

[0008] The top cover is connected to the housing and seals the opening;

[0009] And a mounting assembly connected to the side of the upper cover away from the receiving cavity, wherein the mounting assembly is brazed to the upper cover.

[0010] Optionally, the mounting assembly includes a reinforcing plate, a support plate, and fasteners. The reinforcing plate is brazed to the upper cover, and the support plate is welded to the side of the reinforcing plate opposite to the upper cover. The fasteners are at least partially connected between the reinforcing plate and the support plate and at least partially pass through the support plate.

[0011] Optionally, the battery pack has a first orientation, the fastener includes a connected head and a rod, the support plate is provided with a mounting hole that penetrates the support plate along the first orientation, and in a projection plane perpendicular to the first orientation, the orthographic projection area of ​​the mounting hole is smaller than the orthographic projection area of ​​the head and larger than the orthographic projection area of ​​the rod; the head of the fastener is connected between the reinforcing plate and the support plate, and the rod of the fastener passes through the support plate via the mounting hole.

[0012] Optionally, the reinforcing plate is provided with a positioning groove, and the head of the fastener is at least partially located within the positioning groove.

[0013] Optionally, the support plate and the reinforcing plate are fixed by laser welding.

[0014] Optionally, the support plate is further provided with welding holes, and the reinforcing plate and the support plate form weld marks around the welding holes and are connected to each other.

[0015] Optionally, the battery pack has a first direction, the thickness of the reinforcing plate along the first direction is T3mm, and the penetration depth of the laser welding between the bearing plate and the reinforcing plate is H1mm, satisfying: T3>H1.

[0016] Optionally, the battery pack has a first direction and a second direction that are perpendicular to each other, and a plurality of the support plates are connected to one of the reinforcing plates, with the plurality of support plates spaced apart along the first direction or the second direction.

[0017] Optionally, one of the carrier plates is used to pass through one of the fasteners, or one of the carrier plates is used to pass through multiple of the fasteners.

[0018] Optionally, the battery pack has a first direction, the upper cover includes a flow channel plate and a bottom plate, the flow channel plate has a flow channel groove, the bottom plate is connected to the flow channel plate and surrounds the flow channel groove to form a flow channel cavity, wherein the bottom plate is disposed near the receiving cavity and blocks the opening, and the reinforcing plate is brazed and fixed to the side of the flow channel plate away from the bottom plate along the first direction.

[0019] Optionally, the reinforcing plate, the flow channel plate, and the base plate are all fixed together by brazing.

[0020] Optionally, the reinforcing plate, the flow channel plate, and the base plate all include multiple layers of structural layers continuously arranged along the first direction, wherein the multiple structural layers include at least two of the following: ternary aluminum alloy layers, quaternary aluminum alloy layers, pentylene aluminum alloy layers, lignin aluminum alloy layers, and septeminate aluminum alloy layers; wherein...

[0021] The adjacent structural layers between the reinforcing plate and the flow channel plate are made of the same aluminum alloy, and the adjacent structural layers between the flow channel plate and the base plate are made of the same aluminum alloy.

[0022] Optionally, the reinforcing plate may be provided with a solder layer on the side near the flow channel plate, or the flow channel plate may be provided with a solder layer on the side near the reinforcing plate, wherein the melting point of the solder layer is lower than the melting point of the structural layer;

[0023] Optionally, the flow channel plate may be provided with a solder layer on the side near the base plate, or the base plate may be provided with a solder layer on the side near the flow channel plate, wherein the melting point of the solder layer is lower than the melting point of the structural layer.

[0024] Optionally, the length extension direction of the reinforcing plate intersects with the length extension direction of the flow channel groove.

[0025] Secondly, this application also discloses an electrical device including a battery pack as described in any of the preceding claims, wherein the battery pack is connected to the electrical device via the mounting assembly.

[0026] In this embodiment, since the mounting component is connected to the side of the top cover away from the receiving cavity and is brazed to the top cover, the mounting component does not need to pass through the battery pack. Therefore, when designing the position of the mounting component, there is no need to consider the limitations and influences of the internal structure of the battery pack. The mounting component can be connected to any position on the side of the top cover away from the receiving cavity, providing good flexibility in the design of the mounting component's position. This connection method also improves the flexibility of matching the battery pack with the battery pack installation space in the electrical equipment, thereby helping to improve the reliability of the connection between the battery pack and the electrical equipment. Furthermore, this brazing fixing method allows the mounting component and the top cover to be formed together in the brazing furnace, reducing manufacturing costs. The battery pack top cover does not need to have mounting holes, which also improves the battery pack's sealing performance and further ensures the reliability of the battery pack.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a schematic diagram of the battery pack structure in an embodiment of this application;

[0030] Figure 2 This is an exploded schematic diagram of the battery pack in an embodiment of this application;

[0031] Figure 3 This is a top view of the battery pack in an embodiment of this application;

[0032] Figure 4 yes Figure 3 Sectional view A-A;

[0033] Figure 5 yes Figure 4 One of the enlarged schematic diagrams of section B in the middle;

[0034] Figure 6 yes Figure 4 Part B enlarged schematic diagram, part two;

[0035] Figure 7 yes Figure 3 C-C section view;

[0036] Figure 8 yes Figure 7 One of the enlarged schematic diagrams of section D in the middle;

[0037] Figure 9 yes Figure 7 Second enlarged schematic diagram of section D;

[0038] Figure 10 This is a schematic diagram of the structure of the mounting component in an embodiment of this application;

[0039] Figure 11 This is an exploded view of the mounted components in an embodiment of this application.

[0040] Reference numerals: 10 - Mounting assembly, 11 - Reinforcing plate, 111 - Positioning groove, 12 - Bearing plate, 121 - Mounting hole, 122 - Welding hole, 13 - Fastener, 131 - Head, 132 - Rod, 20 - Top cover, 21 - Flow channel plate, 211 - Flow channel groove, 22 - Bottom plate, 23 - Flow channel cavity, 30 - Box body, 31 - Receiving cavity, 32 - Bottom protective plate, 40 - Thermal conductive layer, 50 - Battery cell, X - First direction, Y - Second direction, Z - Third direction. Detailed Implementation

[0041] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0042] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0043] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] With the development of new energy technologies, power battery packs are being used more and more widely in various electrical devices. These battery packs typically have a mounting structure for connecting to the electrical equipment. For example, more and more power battery packs are being used in vehicles. When used in vehicles, the battery pack is usually located under the vehicle chassis and has a mounting structure for connection. Furthermore, for CTB battery packs, the top cover can also be used directly as the vehicle chassis, thus greatly improving the vehicle's space utilization.

[0046] However, in related technologies, the battery pack mounting structure needs to penetrate the interior of the battery pack. Due to the complex internal structure of the battery pack, the design flexibility of this mounting structure is poor. Furthermore, when the mounting structure cannot be flexibly designed, it is difficult to match the limited battery pack installation space in the electrical equipment, and it is also difficult to guarantee the reliability of the connection between the battery pack and the electrical equipment. When the battery pack is mounted on the vehicle chassis, or when the battery pack cover is used as the vehicle chassis, this mounting structure makes it difficult to guarantee the battery pack's sealing performance and the reliability of the connection with the vehicle.

[0047] To address the aforementioned issues, this application provides a battery pack, as shown in the figure. The battery pack provided in this application has three perpendicular directions: a first direction X, a second direction Y, and a third direction Z. In this application embodiment, the first direction X is the height direction of the battery pack, and the second direction Y and the third direction Z are the length and width directions of the battery pack, respectively. The battery pack may include a housing 30, a top cover 20, and a mounting assembly 10. The housing 30 has a receiving cavity 31 with an opening. The top cover 20 is connected to the housing 30 and seals the opening. The mounting assembly 10 is connected to the side of the top cover 20 along the first direction X away from the receiving cavity 31, wherein the mounting assembly 10 is brazed to the top cover 20.

[0048] In this embodiment, since the mounting component 10 is connected to the side of the upper cover 20 away from the receiving cavity 31, and the mounting component 10 is brazed to the upper cover 20, the mounting component 10 does not need to pass through the battery pack. Therefore, when designing the position of the mounting component 10, there is no need to consider the limitations and influences of the internal structure of the battery pack. The mounting component 10 can be connected to any position on the side of the upper cover 20 away from the receiving cavity 31, providing good flexibility in the position design. This connection method also improves the flexibility of matching the battery pack with the battery pack installation space in the electrical equipment, thereby helping to improve the reliability of the connection between the battery pack and the electrical equipment. Furthermore, with this welding connection method, the mounting component 10 can be formed together with the upper cover 20 in the brazing furnace, reducing manufacturing costs. Also, the upper cover 20 of the battery pack does not need to have mounting holes 121, which improves the sealing performance of the battery pack and further ensures its reliability.

[0049] The housing 30 also includes a bottom protective plate 32, which is connected to the side of the housing 30 away from the top cover 20. In practical applications, when the bottom of the battery pack is impacted, the bottom protective plate 32 can provide a certain buffering effect and reduce the impact on the battery cells 50 inside the battery pack.

[0050] In specific applications, the mounting component 10 can be brazed to the top cover 20. The mounting component 10 and the top cover 20 can be placed together in a brazing furnace. A brazing filler metal with a melting point lower than that of the top cover 20 and the mounting component 10 is selected. The filler metal is heated above its melting point using methods such as flame heating, thermal induction heating, or vacuum heating, while the furnace temperature is controlled below the melting points of the top cover 20 and the mounting component 10. This causes the filler metal to melt while the top cover 20 and the mounting component 10 remain solid. During this process, the liquid filler metal fills the gap between the top cover 20 and the mounting component 10 through capillary action and undergoes atomic diffusion, forming a strong metallurgical bond. After a period of time, the filler metal completely fills the gap between the top cover 20 and the mounting component 10. Then, the temperature inside the brazing furnace is lowered to slowly restore the internal temperature to room temperature, and the filler metal returns to a solid state, thus connecting the mounting component 10 and the top cover 20 together. In addition, the upper cover 20 and the mounting component 10 can be designed so that the inner structure remains solid as the main structure layer, and the outermost structure is used as brazing filler metal to connect the upper cover 20 and the mounting component 10 by melting.

[0051] In this embodiment, the mounting component 10 can be welded to any position of the upper cover 20 via brazing, without being limited by the internal structure of the battery pack. This improves the flexibility of the mounting component 10's position and facilitates matching the position of the mounting component 10 with the battery installation space in the electrical equipment. Furthermore, since the melting point of the brazing filler metal is lower than that of the upper cover 20 and the mounting component 10, high temperatures can be avoided from damaging the structure of the upper cover 20 and the mounting component 10 during the melting process, ensuring the structural stability of the upper cover 20 and the mounting component 10 after welding. Welding in a brazing furnace results in more uniform heating of the components to be welded, allowing for better control of welding-induced deformation and reducing the probability that deformation of the upper cover 20 and the mounting component 10 will affect the connection strength between them. This makes the connection between the mounting component 10 and the upper cover 20 more stable and reliable.

[0052] Optionally, the mounting assembly 10 includes a reinforcing plate 11, a support plate 12, and a fastener 13. The reinforcing plate 11 is brazed and fixed to the upper cover 20, the support plate 12 is welded and fixed to the side of the reinforcing plate 11 away from the upper cover 20, and the fastener 13 is at least partially connected between the reinforcing plate 11 and the support plate 12 and at least partially passes through the support plate 12. Through this combined mounting structure, the reinforcing plate 11 can be welded and fixed at any position on the top cover 20. The setting of the reinforcing plate 11 allows for a larger welding area between the mounting structure and the top cover 20, thereby ensuring the connection strength and reliability between the entire mounting assembly 10 and the top cover 20, and reducing the risk of the battery pack detaching from the electrical equipment due to a loose connection between the mounting assembly 10 and the top cover 20. Furthermore, the welding connection between the reinforcing plate 11 and the support plate 12 results in a higher connection strength. With the fastener 13 at least partially connected between the reinforcing plate 11 and the support plate 12, the connection reliability between the fastener 13 and the two is ensured. The contact surface between the fastener 13 and the support plate 12 can provide effective and stable support and traction for the entire battery pack. When the battery pack is connected to the electrical equipment through the mounting assembly 10, the risk of the battery pack falling off can be effectively avoided.

[0053] Optionally, the fastener 13 includes a head 131 and a rod 132 connected together. The support plate 12 is provided with a mounting hole 121, which penetrates the support plate 12 along a first direction X. In a projection plane perpendicular to the first direction X, the orthographic projection area of ​​the mounting hole 121 is smaller than the orthographic projection area of ​​the head 131 and larger than the orthographic projection area of ​​the rod 132. The head 131 of the fastener 13 is connected between the reinforcing plate 11 and the support plate 12, and the rod 132 of the fastener 13 passes through the support plate 12 through the mounting hole 121. Thus, since the projected area of ​​the mounting hole 121 is smaller than the projected area of ​​the head 131 but larger than the projected area of ​​the rod 132, when the fastener 13 passes through the mounting hole 121 of the support plate 12, its head 131 can be limited between the support plate 12 and the reinforcing plate 11, while the rod 132 can pass through the mounting hole 121. Therefore, the mounting assembly 10 can achieve the hoisting of the battery pack through the limiting cooperation between the fastener 13 and the support plate 12. It should be noted that the projected area of ​​the mounting hole 121 can be formed by the projection of its hole wall.

[0054] Furthermore, the mounting hole 121 is a stepped hole, comprising a first hole segment and a second hole segment interconnected along the first direction X. The diameter of the first hole segment is larger than that of the second hole segment. The first hole segment is positioned close to the reinforcing plate 11 and forms a limiting cavity with the reinforcing plate 11. The head 131 of the fastener 13 is connected within the limiting cavity, and the shank 132 of the fastener 13 passes through the bearing plate 12 via the second hole segment. In this way, the first hole segment can accommodate at least a portion of the head 131 of the fastener 13, thereby reducing the size of the head 131 of the fastener 13 protruding from the bearing plate 12, reducing the interference of the fastener 13 on the welding connection between the bearing plate 12 and the reinforcing plate 11, and ensuring the welding effect between the bearing plate 12 and the reinforcing plate 11.

[0055] Furthermore, such as Figure 6 As shown, the thickness of the bearing plate 12 along the first direction X is T1mm, and the size of the head 131 of the fastener 13 along the first direction X is T2mm, satisfying: T1>T2. In this way, the head 131 of the fastener 13 can be completely accommodated in the mounting hole 121, further ensuring the tightness of the connection between the bearing plate 12 and the reinforcing plate 11.

[0056] like Figure 11 As shown, the reinforcing plate 11 is provided with a positioning groove 111, and the head 131 of the fastener 13 is at least partially located within the positioning groove 111. The positioning groove 111 ensures the accuracy of the installation point of the fastener 13. Since the connection position between the mounting assembly 10 and the electrical equipment is mainly determined by the position of the fastener 13, after the reinforcing plate 11 is connected to the battery pack cover 20, the head 131 of the fastener 13 can be placed in the positioning groove 111 to achieve the initial positioning of the fastener 13. Then, the mounting hole 121 of the bearing plate 12 is aligned with the rod 132 of the fastener 13 and assembled. In this way, when the bearing plate 12 and the reinforcing plate 11 are welded, the fastener 13 can restrict the displacement of the bearing plate 12 relative to the reinforcing plate 11, ensuring the accuracy of the relative position of the bearing plate 12 and the fastener 13 with the reinforcing plate 11. On the other hand, the positioning groove 111 can also provide clearance space for the head 131 of the fastener 13. The head 131 of the fastener 13 is at least partially located in the positioning groove 111. Through the cooperation between the positioning groove 111 on the reinforcing plate 11 and the mounting hole 121 on the support plate 12, the head 131 of the fastener 13 can be prevented from interfering with the welding operation between the support plate 12 and the reinforcing plate 11, and the connection between the support plate 12 and the reinforcing plate 11 can be tighter.

[0057] Optionally, the reinforcing plate 11 is connected to the top cover 20 by brazing, and the bearing plate 12 is connected to the reinforcing plate 11 by laser welding, so as to balance process cost and connection reliability.

[0058] The reinforcing plate 11 and the upper cover 20 are connected by brazing. During the melting process of the brazing filler metal, high temperature can be avoided to prevent damage to the structure of the upper cover 20 and the reinforcing plate 11, thus ensuring the structural stability of the upper cover 20 and the reinforcing plate 11 after the welded connection. Moreover, the upper cover 20 and the reinforcing plate 11 are heated more evenly under the brazing method, which can better control the deformation caused by welding and reduce the probability that the deformation of the upper cover 20 and the mounting component 10 will affect the connection strength between them, making the connection between the mounting component 10 and the upper cover 20 more stable and reliable.

[0059] Since fasteners 13 are required to be assembled between the support plate 12 and the reinforcing plate 11, the support plate 12, the reinforcing plate 11 and the top cover 20 can be avoided from being placed in the brazing furnace together. After the reinforcing plate 11 and the top cover 20 are brazed in the furnace, the support plate 12 is then brazed to complete the welding operation with the reinforcing plate 11. By using laser welding to connect the reinforcing plate 11 and the support plate 12 together, the connection strength between the two can be guaranteed. Furthermore, the support plate 12 can be made of a material with higher strength than the reinforcing plate 11 to ensure the overall strength and mechanical properties of the entire mounting assembly 10.

[0060] For example, in this application, the reinforcing plate 11 and the supporting plate 12 are made of aluminum alloy, and the fastener 13 is made of carbon steel bolts. In specific applications, the reinforcing plate 11 and the upper cover 20 can be placed in a brazing furnace, and the reinforcing plate 11 and the upper cover 20 can be connected as a whole by melting and solidifying the brazing filler metal. Then, the upper cover 20 and the reinforcing plate 11 can be removed from the brazing furnace as a whole, and the supporting plate 12 can be welded to the side of the reinforcing plate 11 away from the upper cover 20 by laser welding. It should be noted that since the fastener 13 is at least partially connected between the reinforcing plate 11 and the supporting plate 12, before welding the supporting plate 12 and the reinforcing plate 11, the fastener 13 needs to be passed through the supporting plate 12 from the side of the supporting plate 12 closest to the reinforcing plate 11, so that one end of the fastener 13 is engaged between the supporting plate 12 and the reinforcing plate 11, and the other end passes through the supporting plate 12. The fastener 13 is engaged between the support plate 12 and the reinforcing plate 11, and the other end of the fastener 13 passes through the support plate 12 and is connected to the installation point of the electrical equipment, so as to realize the connection between the mounting component 10 and the electrical equipment, thereby mounting the battery pack in the electrical equipment.

[0061] like Figure 11 As shown, the support plate 12 is also provided with welding holes 122; the reinforcing plate 11 and the support plate 12 form weld marks around the welding holes 122 and are connected to each other. Specifically, the reinforcing plate 11 and the support plate 12 are fixed by laser welding. It can be understood that when the reinforcing plate 11 and the support plate 12 are laser welded, the laser energy can be directly applied to the support plate 12 and the reinforcing plate 11, thereby improving the energy utilization efficiency.

[0062] In practical applications, the welding operation can be carried out continuously along the circumferential edge of the welding hole 122, so that a continuous circumferential weld can be formed around the through hole, which improves the connection strength and effect between the bearing plate 12 and the reinforcing plate 11.

[0063] like Figure 11 As shown, there are multiple welding holes 122, which are spaced around the fastener 13. The design of multiple welding holes 122 optimizes the stress distribution of the connection between the support plate 12 and the reinforcing plate 11, making the connection strength between the support plate 12 and the reinforcing plate 11 in the circumferential direction of the fastener 13 more uniform. This ensures the uniformity of the connection strength between the support plate 12 and the reinforcing plate 11 at different positions. When the fastener 13 is connected to electrical equipment, it reduces the risk of the reinforcing plate 11 and the support plate 12 detaching due to excessive force at a single connection point.

[0064] like Figure 9 As shown, the thickness of the reinforcing plate 11 along the first direction X is T3mm, and the penetration depth of the laser welding between the bearing plate 12 and the reinforcing plate 11 is H1mm, satisfying: T3 > H1. It can be understood that since the bearing plate 12 and the reinforcing plate 11 are connected by laser welding, and the welding hole 122 is a through hole, by controlling the thickness of the reinforcing plate 11 to be greater than the laser welding penetration depth, the welding energy during the laser welding process of the bearing plate 12 and the reinforcing plate 11 can be prevented from penetrating the reinforcing plate 11, thus preventing further damage to the upper cover 20 connected to the reinforcing plate 11 by the welding energy.

[0065] It should be noted that in some optional embodiments of this application, the top cover 20 can be a cold plate of the battery pack, and its interior can be filled with a heat exchange medium. In the case that the welding energy cannot penetrate the reinforcing plate 11, the integrity of the cold plate can be guaranteed, thereby ensuring the normal operation of the cold plate.

[0066] In specific applications, the parameters for laser welding, such as laser power, pulse width, and laser frequency, can be selected according to the thickness of the reinforcing plate 11 and the materials of the bearing plate 12 and the reinforcing plate 11, in order to control the welding penetration depth.

[0067] like Figure 10As shown, a reinforcing plate 11 is connected to multiple bearing plates 12, which are spaced apart along the first direction X or the second direction Y. This increases the number of connection points between the reinforcing plate 11 and the bearing plates 12, which can disperse the concentrated load connected to the bearing plates 12 and the reinforcing plate 11, ensuring the reliability of the connection between the reinforcing plate 11 and the bearing plates 12. In addition, since fasteners 13 are also connected between the bearing plates 12 and the reinforcing plate 11, the number of fasteners 13 connected between the bearing plates 12 and the reinforcing plate 11 is also increased. With a fixed number of reinforcing plates 11, the number of connection points for the entire mounting assembly 10 to connect with the electrical equipment is increased, ensuring the connection effect between the mounting assembly 10 and the electrical equipment.

[0068] In specific applications, the reinforcing plate 11 can be a rectangular structure, and multiple supporting plates 12 can be evenly spaced along the length of the reinforcing plate 11. For example, in an embodiment of this application, two supporting plates 12 are connected to one reinforcing plate 11, and the two supporting plates 12 are symmetrically arranged on both sides of the reinforcing plate 11 along the second direction Y.

[0069] Optionally, one support plate 12 is used to pass through one fastener 13, or one support plate 12 is used to pass through multiple fasteners 13. When one support plate 12 passes through one fastener 13, the mounting hole 121 of the support plate 12 can be located at the center of the support plate 12. This simplifies the structure of the entire mounting assembly 10, thereby improving the installation efficiency between the support plate 12 and the reinforcing plate 11. Furthermore, when each support plate 12 bears the force transmitted by only one fastener 13, the force distribution is relatively concentrated, reducing local stress concentration caused by uneven force distribution between the fastener 13 and the support plate 12, thereby improving the structural stability of the entire mounting assembly 10. When a carrier plate 12 passes through multiple fasteners 13, the multiple fasteners 13 work together to better resist external vibration and impact when the battery pack is connected to the electrical equipment through the mounting assembly 10, preventing the connection from loosening or falling off, and improving the reliability and durability of the entire mounting assembly 10. In addition, the multiple fasteners 13 can be used as a redundant design. If one fastener 13 becomes loose or falls off, the remaining fasteners 13 can still provide a tightening effect, further ensuring the reliability of the mounting assembly 10.

[0070] It should be noted that if the distance between adjacent fasteners 13 is too small or their number is too large, it will increase the overall weight of the battery pack, reduce the overall energy density of the battery pack, and make it difficult to control the welding dimensional tolerances between the support plate 12 and the reinforcing plate 11. If the distance between adjacent fasteners 13 is too large, it will be difficult to guarantee the traction force on the bottom battery pack of the mounting assembly 10. In practical applications, the minimum distance between adjacent fasteners 13 can be controlled to be 180mm ≤ H ≤ 220mm to avoid the above problems.

[0071] like Figure 5 , Figure 8 As shown, the upper cover 20 includes a flow channel plate 21 and a bottom plate 22. The flow channel plate 21 has a flow channel groove 211. The bottom plate 22 is connected to the flow channel plate 21 and surrounds the flow channel groove 211 to form a flow channel cavity 23. The bottom plate 22 is located near the receiving cavity 31 and seals the opening. The reinforcing plate 11 is brazed and fixed to the side of the flow channel plate 21 away from the bottom plate 22 along the first direction X. By using the upper cover 20 as a cold plate for the battery pack, heat dissipation of the battery cells 50 in the receiving cavity 31 can be achieved. By brazing and fixing the reinforcing plate 11 to the flow channel plate 21, the position of the reinforcing plate 11 can be flexibly set at any position on the side of the flow channel plate 21 away from the bottom plate 22, which improves the positional flexibility of the reinforcing plate 11 and ensures the positional flexibility of the entire mounting assembly 10, making it easy to adapt to the layout space of the electrical equipment.

[0072] It should be noted that in this structure, since the top cover 20 is located at the top of the battery pack as a cold plate, the battery cell 50 is actually inverted in the pre-accommodation cavity 31. The bottom of the battery cell 50 is connected to the top cover 20 through the thermally conductive layer 40 to improve the heat exchange efficiency. The thermally conductive layer 40 can be a thermally conductive structural adhesive. The thermally conductive structural adhesive can not only play a role in heat transfer, but also serve as a connecting layer to connect the top cover 20 and the battery cell 50, thereby reducing the vibration of the battery cell 50.

[0073] Optionally, the reinforcing plate 11, the flow channel plate 21, and the base plate 22 are all fixed together by brazing. It should be noted that in related technologies, the flow channel plate 21 and the base plate 22 can usually be formed into one piece by brazing. When the reinforcing plate 11 is brazed to the flow channel plate 21 and the base plate 22, the reinforcing plate 11 can be placed together with the flow channel plate 21 and the base plate 22 in a brazing furnace. The connection between the flow channel plate 21 and the base plate 22 and the connection between the flow channel plate 21 and the reinforcing plate 11 can be completed simultaneously, reducing the processing steps of the entire battery pack and improving the production efficiency of the battery pack.

[0074] Optionally, the reinforcing plate 11, the flow channel plate 21, and the base plate 22 all include multi-layer structural layers continuously arranged along the first direction X. The multi-layer structural layers include at least two of the following: a tri-series aluminum alloy layer, a quadri-series aluminum alloy layer, a quinary-series aluminum alloy layer, a hexa-series aluminum alloy layer, and a sept-series aluminum alloy layer. Among them, the adjacent structural layers between the reinforcing plate 11 and the flow channel plate 21 are homo-series aluminum alloy layers, and the adjacent structural layers between the flow channel plate 21 and the base plate 22 are homo-series aluminum alloy layers. When the reinforcing plate 11, the flow channel plate 21, and the base plate 22 are connected by brazing, this design of setting the adjacent structural layers as homo-series aluminum alloys allows the adjacent structural layers to reach their melting points at roughly the same time in the brazing furnace, since homo-series aluminum alloys have the same or similar melting points. That is, the aluminum alloys of the adjacent structural layers can melt in a shorter time period, and then the furnace temperature can be reduced to restore them to a solid state, thereby improving the welding efficiency.

[0075] For example, in the embodiments of this application, the reinforcing plate 11, the flow channel plate 21, and the bottom plate 22 all include a six-series aluminum alloy layer located in the middle along the thickness direction, and a three-series aluminum alloy layer disposed on both sides of the six-series aluminum alloy layer along the thickness direction. The three-series aluminum alloy between the reinforcing plate 11 and the flow channel plate 21, and the three-series aluminum alloy between the flow channel plate 21 and the bottom plate 22 have the same or similar melting points. Therefore, the two sides of the flow channel plate 21 can be welded to the reinforcing plate 11 and the bottom plate 22 in a shorter time, which speeds up the welding efficiency.

[0076] Optionally, the reinforcing plate 11 may be provided with a solder layer on the side near the flow channel plate 21, or the flow channel plate 21 may be provided with a solder layer on the side near the reinforcing plate 11. The melting point of the solder layer is lower than that of the structural layer. In this way, the solder layer with a lower melting point can act as the solder for brazing, so that the solder layer can melt at a low temperature in the furnace, thereby speeding up the manufacturing efficiency.

[0077] In some alternative embodiments, the flow channel plate 21 is provided with a solder layer on the side near the bottom plate 22, or the bottom plate 22 is provided with a solder layer on the side near the flow channel plate 21, wherein the melting point of the solder layer is lower than that of the structural layer. In this way, the solder layer with a lower melting point can act as the solder for brazing, so that the solder layer can melt even at a low furnace temperature, thereby speeding up the manufacturing efficiency.

[0078] For example, in this embodiment, the reinforcing plate 11 near the flow channel plate 21 is further provided with a four-layer aluminum alloy on the outside of the three-layer aluminum alloy, and the flow channel plate 21 near the bottom plate 22 is also provided with a four-layer aluminum alloy on the outside of the three-layer aluminum alloy. It should be noted that the type of aluminum alloy layer is not specifically limited in this embodiment, as long as it meets the structural strength and welding requirements.

[0079] Optionally, the length extension direction of the reinforcing plate 11 intersects with the length extension direction of the flow channel 211. Reinforcing ribs are provided between the flow channel 211. Since the thickness of the flow channel plate 21 is relatively smaller and its structural strength is lower at the position opposite to the flow channel 211, by designing the length extension direction of the reinforcing plate 11 to intersect with the length extension direction of the flow channel 211, the flow channel 211 and the reinforcing ribs are actually alternately distributed along the length extension direction of the reinforcing plate 11. This avoids the reinforcing plate 11 and the flow channel 211 being directly opposite each other in the first direction X, reducing the risk of decreased connection strength between the flow channel 211 and the reinforcing plate 11 due to the lower structural strength of the flow channel 211.

[0080] like Figures 1-4 and Figure 7 As shown, there are multiple mounting components 10, and the multiple mounting components 10 are spaced apart on the upper cover 20 along the second direction Y and / or the third direction Z.

[0081] Understandably, by setting multiple mounting components 10, each mounting component 10 can be connected to the electrical device, increasing the number of connection points between the battery pack and the electrical device, thereby improving the reliability of the connection between the battery pack and the electrical device, reducing the risk of the battery pack detaching from the electrical device, and ensuring the safety of the battery pack.

[0082] For example, in this embodiment of the application, there are two mounting components 10, and the two mounting components 10 are spaced apart along the third direction Z.

[0083] In summary, the battery pack provided in this application embodiment may include at least the following advantages:

[0084] In this embodiment, since the mounting component 10 is connected to the side of the upper cover 20 away from the receiving cavity 31, and the mounting component 10 is brazed to the upper cover 20, the mounting component 10 does not need to pass through the battery pack. Therefore, when designing the position of the mounting component 10, there is no need to consider the limitations and influences of the internal structure of the battery pack. The mounting component 10 can be connected to any position on the side of the upper cover 20 away from the receiving cavity 31, providing good flexibility in the position design. This connection method also improves the flexibility of matching the battery pack with the battery pack installation space in the electrical equipment, thereby helping to improve the reliability of the connection between the battery pack and the electrical equipment. Furthermore, this brazing method allows the mounting component 10 and the upper cover 20 to be formed together in the brazing furnace, reducing manufacturing costs. Also, the upper cover 20 of the battery pack does not need to have mounting holes 121, which improves the sealing performance of the battery pack and further ensures its reliability.

[0085] This application also provides an electrical device, which includes a main body and a battery pack as described in any of the above embodiments, wherein the battery pack is connected to the main body via the mounting component 10.

[0086] It should be noted that in this embodiment, the structure of the battery pack is the same as that of any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0087] In some embodiments of this application, the battery pack is applied to a vehicle. The battery pack is connected to the floor of the vehicle via a mounting assembly 10. Alternatively, the battery pack can be connected to the vehicle chassis via the mounting assembly 10, or the top cover 20 of the battery pack can be used directly as the vehicle chassis. In specific applications, a mounting beam can be provided at the bottom of the vehicle, with mounting holes on the beam. Fasteners 13 of the mounting assembly 10 can pass through the mounting holes from bottom to top, and then the other side of the mounting hole is locked with a locking member to connect the battery pack to the vehicle via the mounting assembly 10.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, The battery pack includes: The box (30) is provided with a receiving cavity (31) having an opening; A top cover (20) is attached to the housing (30) and seals the opening; And a mounting assembly (10) connected to the side of the upper cover (20) away from the receiving cavity (31), wherein the mounting assembly (10) is brazed to the upper cover (20).

2. The battery pack according to claim 1, characterized in that, The mounting assembly (10) includes a reinforcing plate (11), a support plate (12), and a fastener (13). The reinforcing plate (11) is brazed and fixed to the upper cover (20). The support plate (12) is welded and fixed to the side of the reinforcing plate (11) away from the upper cover (20). The fastener (13) is at least partially connected between the reinforcing plate (11) and the support plate (12) and at least partially passes through the support plate (12).

3. The battery pack according to claim 2, characterized in that, The battery pack has a first direction (X), the fastener (13) includes a head (131) and a rod (132) connected together, the support plate (12) is provided with a mounting hole (121), the mounting hole (121) penetrates the support plate (12) along the first direction (X), along the first direction (X) in a projection plane perpendicular to the first direction (X), the orthographic projection area of ​​the mounting hole (121) is smaller than the orthographic projection area of ​​the head (131) and larger than the orthographic projection area of ​​the rod (132); the head (131) of the fastener (13) is connected between the reinforcing plate (11) and the support plate (12), and the rod (132) of the fastener (13) passes through the support plate (12) through the mounting hole (121).

4. The battery pack according to claim 3, characterized in that, The reinforcing plate (11) is provided with a positioning groove (111), and the head (131) of the fastener (13) is at least partially located in the positioning groove (111).

5. The battery pack according to claim 2, characterized in that, The support plate (12) and the reinforcing plate (11) are fixed by laser welding.

6. The battery pack according to claim 5, characterized in that, The support plate (12) is also provided with welding holes (122); The reinforcing plate (11) and the bearing plate (12) form a weld mark around the welding hole (122) and are connected to each other.

7. The battery pack according to claim 5, characterized in that, The battery pack has a first direction (X), the thickness of the reinforcing plate (11) along the first direction (X) is T3mm, and the weld penetration between the bearing plate (12) and the reinforcing plate (11) is H1mm, satisfying: T3>H1.

8. The battery pack according to claim 2, characterized in that, The battery pack has a first direction (X) and a second direction (Y) that are perpendicular to each other. A plurality of the support plates (12) are connected to a reinforcing plate (11), and the plurality of support plates (12) are spaced apart along the first direction (X) or the second direction (Y).

9. The battery pack according to claim 2, characterized in that, One of the support plates (12) is used to pass through one of the fasteners (13), or one of the support plates (12) is used to pass through multiple of the fasteners (13).

10. The battery pack according to claim 2, characterized in that, The battery pack has a first direction (X). The top cover (20) includes a flow channel plate (21) and a bottom plate (22). The flow channel plate (21) has a flow channel groove (211). The bottom plate (22) is connected to the flow channel plate (21) and surrounds the flow channel groove (211) to form a flow channel cavity (23). The bottom plate (22) is located near the receiving cavity (31) and blocks the opening. The reinforcing plate (11) is brazed and fixed to the flow channel plate (21) on the side away from the bottom plate (22) along the first direction (X).

11. The battery pack according to claim 10, characterized in that, The reinforcing plate (11), the flow channel plate (21), and the base plate (22) are all fixed together by brazing.

12. The battery pack according to claim 11, characterized in that, The reinforcing plate (11), the flow channel plate (21), and the base plate (22) all include multiple layers of structural layers continuously arranged along the first direction (X). These multiple structural layers include at least two of the following: a ternary aluminum alloy layer, a quaternary aluminum alloy layer, a quinary aluminum alloy layer, a hexa-aluminum alloy layer, and a sept-aluminum alloy layer. The adjacent structural layers between the reinforcing plate (11) and the flow channel plate (21) are aluminum alloy layers of the same series, and the adjacent structural layers between the flow channel plate (21) and the base plate (22) are aluminum alloy layers of the same series.

13. The battery pack according to claim 12, characterized in that, The battery pack meets one of the following conditions: A) The reinforcing plate (11) is provided with a solder layer on the side near the flow channel plate (21), or the flow channel plate (21) is provided with a solder layer on the side near the reinforcing plate (11), wherein the melting point of the solder layer is lower than the melting point of the structural layer; B) The flow channel plate (21) is provided with a solder layer on the side near the bottom plate (22), or the bottom plate (22) is provided with a solder layer on the side near the flow channel plate (21), wherein the melting point of the solder layer is lower than the melting point of the structural layer.

14. The battery pack according to claim 10, characterized in that, The length extension direction of the reinforcing plate (11) intersects with the length extension direction of the flow channel groove (211).

15. An electrical appliance, characterized in that, It includes a main body and a battery pack as described in any one of claims 1 to 14, wherein the battery pack is connected to the main body via the mounting assembly (10).

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