Battery pack and electric device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a lower cover, a liquid cooling plate and at least one battery module. The liquid cooling plate is fixedly connected with the lower cover and jointly defines a sealed containing space. The liquid cooling plate is provided with a liquid cooling channel and a mounting portion. The liquid cooling channel is located on a first surface of the liquid cooling plate. The mounting portion is located on a second surface of the liquid cooling plate. The second surface is arranged opposite to the first surface. The battery module is arranged in the containing space and is fixedly connected with the mounting portion. The application integrates design, reduces weight and cost, improves energy density and reduces maintenance cost.

Description

Technical Field

[0001] This application relates to the field of power batteries, and more specifically, to a battery pack and an electrical device. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the battery pack technology, as a core component, is constantly evolving. Currently, both mainstream MTP (Module to Pack) and CTP (Cell to Pack) packing methods use a battery under-pallet as the mounting support structure for the battery cells, and this pallet is used to connect and fix the battery to the vehicle body. The manufacturing processes of the battery under-pallet mainly include aluminum profile welding, steel welding, and casting. Pallets manufactured using these processes account for a significant proportion of the weight of the power battery system, directly affecting the overall vehicle's lightweight level and energy efficiency.

[0003] To further enhance integration, the industry has proposed innovative battery pack technologies such as CTC (Cell to Chassis) and CTB (Cell to Body), which directly integrate battery cells into the vehicle body structure, eliminating the need for the traditional battery tray design. While this highly integrated solution reduces system weight and improves space utilization, it also brings new challenges: when a single battery cell in the system fails, due to the deep integration of the cell with the vehicle body structure, the repair process requires disassembling the entire integrated structure, leading to complex after-sales maintenance operations, significantly increased labor costs, and potentially even requiring repairs to the vehicle body structure. Utility Model Content

[0004] The purpose of this application is to provide a battery pack and power device that can eliminate the battery tray, thereby reducing weight, lowering costs and increasing efficiency. This not only improves energy density but also reduces after-sales maintenance costs while retaining the traditional modular assembly method.

[0005] In a first aspect, the present invention provides a battery pack, the battery pack including a lower cover, a liquid cooling plate and at least one battery module, the liquid cooling plate being fixedly connected to the lower cover and jointly defining a sealed accommodating space, and the liquid cooling plate having a liquid cooling channel and a mounting part, the liquid cooling channel being located on a first surface of the liquid cooling plate, the mounting part being located on a second surface of the liquid cooling plate, the second surface being disposed opposite to the first surface, and the battery module being placed in the accommodating space and fixedly connected to the mounting part.

[0006] In an optional embodiment, the mounting portion consists of a first mounting section and a second mounting section, which are arranged in a crisscross pattern.

[0007] In an optional embodiment, the first mounting portion extends along the length direction of the liquid cooling plate, and the second mounting portion extends along the width direction of the liquid cooling plate, wherein the length direction is perpendicular to the width direction.

[0008] In an optional embodiment, the mounting part is provided with a lower cover connecting nut and a battery module connecting nut, and a plurality of the lower cover connecting nuts are arranged along a closed path, and the battery module connecting nuts are all located within the closed area of ​​the closed path.

[0009] In an optional embodiment, the battery pack further includes a lower cover connector, the lower cover having a through hole, the lower cover connector passing through the through hole and fixed to the lower cover connecting nut.

[0010] In an optional embodiment, the battery pack further includes a module connector, wherein the battery module has a through hole, and the module connector passes through the through hole and is fixed to the battery module connecting nut.

[0011] In an optional embodiment, the liquid cooling plate is provided with a collector at each end, each collector is provided with a connector, each connector is in fluid communication with the liquid cooling channel, and at least one connector is used for water inlet and at least one connector is used for water outlet.

[0012] In an optional embodiment, the battery pack further includes a thermally conductive adhesive layer located between the liquid cooling plate and the battery module.

[0013] In an optional embodiment, the battery pack further includes a buffer layer located between the battery module and the lower cover.

[0014] Secondly, this utility model provides an electrical device, which includes a vehicle body beam and a battery pack as described in the foregoing embodiments, wherein the liquid cooling plate of the battery pack is fixedly connected to the vehicle body beam.

[0015] Compared to existing technologies, the beneficial effects of this application are: This application integrates the design of the lower cover, liquid cooling plate and battery module, and adopts the method of mounting the battery module on the mounting part, eliminating the lower battery tray, thereby reducing weight, cost and increasing efficiency. It not only improves energy density, but also reduces after-sales maintenance costs while retaining the traditional module assembly method. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall structure of the battery pack and the vehicle body beam is shown in some embodiments; Figure 2 An exploded view of the battery pack and body beams in some embodiments is shown; Figure 3 A three-dimensional structural schematic diagram of the liquid cooling plate is shown in some embodiments; Figure 4 A plan view of the lower cover is shown in some embodiments; Figure 5 A three-dimensional structural schematic diagram of the battery module is shown in some embodiments.

[0018] Explanation of key component symbols: 10-Battery pack; 100-Lower cover; 110-Through hole; 120-Lower cover connector; 200-Liquid cooling plate; 210-Liquid cooling channel; 220-Mounting section; 221-First mounting section; 222-Second mounting section; 220a-Lower cover connecting nut; 220b-Battery module connecting nut; 230-Current collector; 231-Connector; 300-Battery module; 310-Through hole; 320-Module connector; 400-Battery management system; 500-Power distribution box; 600-Output connector; 700-Thermal conductive adhesive layer; 800-Buffer layer; 20-Body beam. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown 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.

[0020] 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.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction 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.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] This embodiment applies to MTB (Module to Bracket) battery systems, and is a novel battery integration technology that directly integrates the battery module 300 onto the vehicle bracket or chassis. It has advantages such as high volume utilization, light weight, and improved vehicle performance.

[0025] Please see Figures 1 to 3This embodiment provides a battery pack 10 for indirect application in electrical devices or energy storage devices. Of course, individual battery cells can also be directly applied in electrical devices or energy storage devices without using a battery pack; no specific limitations are made on the application scenarios of individual battery cells here.

[0026] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc.

[0027] Vehicles can be gasoline-powered cars, natural gas-powered cars, new energy vehicles, etc., and new energy vehicles can be pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, space shuttles, drones, spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers; energy storage devices include energy storage containers, energy storage cabinets, energy storage power stations, wind power generation devices, solar power generation devices, mobile power devices, and temporary power supply devices; no specific restrictions are placed on the types of electrical devices and energy storage devices here.

[0028] The battery pack 10 includes a lower cover 100, a liquid cooling plate 200, and at least one battery module 300.

[0029] The lower cover 100 is made of high-strength composite material.

[0030] The liquid cooling plate 200 is fixedly connected to the lower cover 100 and together they define a sealed containment space, ensuring the internal sealing of the battery pack 10, reducing the impact of the external environment on the battery pack 10, and extending the service life of the battery pack 10.

[0031] In this embodiment, the liquid cooling plate 200 and the lower cover 100 are fixedly connected by bolts.

[0032] The liquid cooling plate 200 is provided with a liquid cooling channel 210 and a mounting part 220. The liquid cooling channel 210 is located on the first surface of the liquid cooling plate 200, and the mounting part 220 is located on the second surface of the liquid cooling plate 200. The second surface is arranged opposite to the first surface. The battery module 300 is placed in the receiving space and fixedly connected to the mounting part 220.

[0033] The first surface is the side of the liquid cooling plate 200 facing the lower cover 100, which is defined as the lower surface, and the second surface is defined as the upper surface.

[0034] In practical applications, the liquid cooling plate 200 is formed from aluminum profiles.

[0035] The mounting section 220 is located on the lower surface of the liquid cooling plate 200, and the mounting section 220 is composed of a first mounting section 221 and a second mounting section 222, which are arranged in a crisscross pattern.

[0036] The first mounting portion 221 extends along the length direction of the liquid cooling plate 200, and the second mounting portion 222 extends along the width direction of the liquid cooling plate 200. The length direction and the width direction are perpendicular to each other. That is, the first mounting portion 221 is defined as a crossbeam, and the second mounting portion is defined as a longitudinal beam.

[0037] The arrangement of longitudinal and transverse beams can improve the strength of the liquid cooling plate 200, thereby enhancing its load-bearing capacity and ensuring the stability of the battery module 300 under load.

[0038] When multiple battery modules 300 are arrayed, the connection position between the lower cover 100 and the liquid cooling plate 200 is the outer ring of the lower cover 100. Therefore, if a closed path is designed on the outer ring of the lower cover 100, then a part of the mounting part 220 should be set along the closed path, and the other part of the mounting part 220 is located within the range of the closed path.

[0039] If the shape of the lower cover 100 is square, then the closed path is square.

[0040] To improve the mounting stability of the battery module 300, it can be designed as follows: two crossbeams and two longitudinal beams within the closed path range form a square, and the size is adapted to the outer contour of a battery module 300. The above-mentioned mounting part 220 is defined as a set of mounting parts, and multiple sets of mounting parts are arranged in an array, with each set of mounting parts matching a corresponding battery module 300.

[0041] Specifically, the mounting part 220 is provided with a lower cover connecting nut 220a and a battery module connecting nut 220b. Multiple lower cover connecting nuts 220a are arranged along a closed path, and the battery module connecting nuts 220b are all located within the closed area of ​​the closed path, that is, the lower cover connecting nut 220a is located on the outer ring of the battery module connecting nut 220b.

[0042] Please see Figures 2 to 4 For the mounting implementation, the battery pack 10 also includes a lower cover connector 120. The lower cover 100 is provided with a through hole 110. The lower cover connector 120 passes through the through hole 110 and is fixed to the lower cover connecting nut 220a.

[0043] Please see Figure 2 , Figure 3 and Figure 5The battery pack 10 also includes a module connector 320. The battery module 300 has a through hole 310. The module connector 320 passes through the through hole 310 and is fixed to the battery module connecting nut 220b.

[0044] Please refer to further information. Figure 2 and Figure 3 The liquid cooling plate 200 has current collectors 230 at both ends. In addition to collecting current, the current collectors 230 also serve to dissipate heat and provide mechanical support.

[0045] Each collector 230 is equipped with a connector 231, and each connector 231 is in fluid communication with the liquid cooling channel 210. At least one connector 231 is used for water inlet, and at least one connector 231 is used for water outlet. The water here refers to a fluid such as a liquid coolant with heat dissipation function. After the liquid coolant is introduced from one connector 231, it flows in the liquid cooling channel 210 to absorb the heat of the battery module 300, and finally exits from one connector 231, thereby achieving the heat dissipation effect.

[0046] Please see Figure 2 This embodiment also includes a battery management system 400, a power distribution box 500, and an output connector 600. The battery management system 400, power distribution box 500, output connector 600, current collector 230, and battery module 300 are electrically connected. The above-mentioned electrical connection method is common knowledge in the art and will not be described in detail here.

[0047] Please see Figure 2 and Figure 3 In this embodiment, the integrated design of the lower cover 100, liquid cooling plate 200 and battery module 300 is adopted. The battery module 300 is mounted on the mounting part 220, eliminating the lower battery tray, thereby reducing weight, cost and increasing efficiency. This not only improves energy density, but also reduces after-sales maintenance costs while retaining the traditional module assembly method. This embodiment eliminates the lower battery tray, achieving further weight reduction, cost reduction, and efficiency improvement, while also improving the assembly efficiency of the power battery system, thereby enhancing the power performance and driving range of new energy vehicles. Compared to the CTP and CTB battery pack configurations, MTB allows for the replacement of individual energy storage units (modules) during after-sales maintenance when a cell fails, eliminating the need for replacing the entire pack and offering greater cost-effectiveness.

[0048] Please see Figure 2 The battery pack also includes a thermally conductive adhesive layer 700, which is located between the liquid cooling plate 200 and the battery module 300.

[0049] In this embodiment, a thermally conductive adhesive layer 700 is provided. The thermally conductive adhesive layer 700 serves as a thermally conductive medium between the battery module 300 and the liquid cooling plate 200, conducting the heat of the battery module 300 to the liquid cooling plate 200 for heat dissipation, thereby preventing the battery pack 10 from overheating and exploding.

[0050] In addition, the thermally conductive adhesive layer 700 also has a sealing effect, improving the sealing performance of the battery pack.

[0051] The battery pack also includes a buffer layer 800, which is located between the battery module 300 and the lower cover 100.

[0052] In this embodiment, a buffer layer 800 is provided. The buffer layer 800 is made of buffer foam and is used for bottom protection of the battery module 300 to achieve the effect of buffering and shock absorption.

[0053] Please see Figures 1 to 3 Based on the above, taking a vehicle as an example, this embodiment also provides an electrical device, which includes a vehicle body beam 20 and a battery pack 10 in the above embodiment. The liquid cooling plate 200 of the battery pack 10 is fixedly connected to the vehicle body beam 20.

[0054] In this embodiment, the liquid cooling plate 200 is not only designed as a mounting part 220 for the battery module 300 and the lower cover 100, but also as a vehicle floor, combined with the upper body beam 20, as part of the vehicle floor assembly, serving to install seats and other interior components, thus realizing battery-vehicle integration.

[0055] Since this embodiment includes the battery pack 10 provided in the above embodiments, this embodiment has all the advantages of the above embodiments.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery pack, characterized in that, The device includes a lower cover, a liquid cooling plate, and at least one battery module. The liquid cooling plate is fixedly connected to the lower cover and together defines a sealed receiving space. The liquid cooling plate is provided with a liquid cooling channel and a mounting part. The liquid cooling channel is located on a first surface of the liquid cooling plate, and the mounting part is located on a second surface of the liquid cooling plate. The second surface is disposed opposite to the first surface. The battery module is placed in the receiving space and fixedly connected to the mounting part.

2. The battery pack as described in claim 1, characterized in that, The mounting section consists of a first mounting section and a second mounting section, which are arranged in a crisscross pattern.

3. The battery pack as described in claim 2, characterized in that, The first mounting portion extends along the length direction of the liquid cooling plate, and the second mounting portion extends along the width direction of the liquid cooling plate, with the length direction and the width direction being perpendicular to each other.

4. The battery pack according to any one of claims 1 to 3, characterized in that, The mounting part is provided with a lower cover connecting nut and a battery module connecting nut. Multiple lower cover connecting nuts are arranged along a closed path, and the battery module connecting nuts are all located within the closed area of ​​the closed path.

5. The battery pack as described in claim 4, characterized in that, It also includes a lower cover connector, wherein the lower cover has a through hole, and the lower cover connector passes through the through hole and is fixed to the lower cover connecting nut.

6. The battery pack as described in claim 4, characterized in that, It also includes a module connector, wherein the battery module has a through hole, and the module connector passes through the through hole and is fixed to the battery module connecting nut.

7. The battery pack according to any one of claims 1 to 3, characterized in that, The liquid cooling plate has a collector at each end, and each collector has a connector. Each connector is in fluid communication with the liquid cooling channel, and at least one connector is used for water inlet and at least one connector is used for water outlet.

8. The battery pack according to any one of claims 1 to 3, characterized in that, It also includes a thermally conductive adhesive layer, which is located between the liquid cooling plate and the battery module.

9. The battery pack according to any one of claims 1 to 3, characterized in that, It also includes a buffer layer located between the battery module and the lower cover.

10. An electrical device, characterized in that, It includes a vehicle body beam and a battery pack as described in any one of claims 1 to 9, wherein the liquid cooling plate of the battery pack is fixedly connected to the vehicle body beam.

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