Battery pack and electric device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a box body having a containing cavity; a battery cell assembly contained in the containing cavity; and a liquid cooling assembly. The liquid cooling assembly comprises a liquid cooling plate having a liquid cooling flow channel for cooling liquid to flow, and the liquid cooling plate is used for heat exchange with the battery cell assembly. The liquid cooling plate is provided with an inlet and an outlet, and the inlet and the outlet are arranged at intervals along the length direction of the box body. The application improves the temperature uniformity in different directions of the battery pack, avoids local overheating, and realizes efficient thermal management of the battery pack in a limited space.

Description

Technical Field

[0001] This application relates to a battery pack and electrical equipment, belonging to the field of new energy battery technology. Background Technology

[0002] With the rapid growth of the electric vehicle market, the performance and structural design of new energy power battery packs, as the core energy storage and supply unit of electric vehicles, directly affect the vehicle's range, safety, and cost control. In the current development of electric vehicle platforms, OEMs have placed higher demands on the battery pack's capacity, outer envelope size, and internal space layout.

[0003] In the process of conceiving and implementing this application, the applicant discovered at least the following problems: Currently, in terms of thermal management, the flow channel design of existing cold plates mostly relies on empirical layout and lacks refined simulation verification for module distribution, resulting in uneven distribution of coolant flow rate and insufficient heat dissipation efficiency in local areas, making it difficult to meet the rapid temperature control requirements of high energy density battery packs.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content

[0005] This application provides a battery pack and electrical device that improves the temperature uniformity of the battery pack in different directions, avoids local overheating, and achieves efficient thermal management of the battery pack in a limited space.

[0006] This application provides a battery pack, including:

[0007] The box-shaped enclosure has a receiving cavity;

[0008] The battery cell assembly is housed within the housing cavity;

[0009] The liquid cooling assembly includes a liquid cooling plate having liquid cooling channels for the flow of coolant, and the liquid cooling plate is used to exchange heat for the battery cell assembly.

[0010] The liquid cooling plate is equipped with a liquid inlet and a liquid outlet, which are spaced apart along the length of the housing.

[0011] The beneficial effects of this application are: by setting the inlet and outlet of the liquid coolant at intervals along the length of the housing, the coolant can flow through most of the liquid cooling plate, which helps to form a longer and wider heat exchange path, thereby improving the temperature uniformity of the battery pack in different directions, avoiding local overheating, and achieving efficient thermal management of the battery pack in a limited space.

[0012] In some alternative embodiments, the housing is provided with at least two lifting lugs, the at least two lifting lugs are located on the same side of the housing, and one of the at least two lifting lugs is located between the liquid inlet and the liquid outlet.

[0013] It should be noted that placing the lifting lugs between the liquid inlet and outlet makes full use of the area in the middle of the liquid cooling plate, which usually has high structural strength, and avoids direct interference between the lifting lugs and the joints of the liquid cooling pipeline. This ensures the stability and safety of the hoisting and simplifies the layout of the external pipeline.

[0014] In some alternative implementations, the battery pack also includes at least two electrical compartments, each located at a different position within the receiving cavity.

[0015] It should be noted that by setting up multiple electrical compartments and distributing them in different locations within the housing, the functional modules are arranged in a distributed manner, which helps to optimize the utilization of the internal space of the enclosure, facilitates the management of wiring harness routing, and may shorten the length of the internal high-voltage connectors.

[0016] In some alternative implementations, at least two electrical compartments include a first electrical compartment and a second electrical compartment;

[0017] The first electrical compartment is located on the first side of the enclosure along the length of the enclosure, and the first electrical compartment extends along the width of the enclosure;

[0018] The second electrical compartment is located on the second side of the enclosure along the width direction, and extends along the length direction of the enclosure.

[0019] It should be noted that the space around and on the sides of the container is fully utilized, which is a three-dimensional space utilization solution that makes the internal layout efficient and orderly.

[0020] In some alternative implementations, the extension dimension of the second electrical compartment along the length of the enclosure is smaller than the extension dimension of the second side of the enclosure.

[0021] It should be noted that this design gives the battery pack greater design flexibility and scalability, making it easier to iterate on subsequent models or adapt to the needs of different customers, and making full use of the vehicle's layout space.

[0022] In some alternative embodiments, the liquid cooling channel includes a connected inlet channel and an outlet channel, with at least two inlet channels and an outlet channel, the inlet port being connected to the inlet channel and the outlet port being connected to the outlet channel.

[0023] It should be noted that the design using multiple inlet and outlet flow channels can be considered as a multi-inlet and multi-outlet or parallel flow channel layout. This design can distribute the coolant more evenly to various areas of the liquid cooling plate, further reducing the temperature difference between different battery cells.

[0024] In some alternative implementations, at least two inlet channels are located on opposite sides of the liquid cooling plate, and the length of the inlet channel is greater than the length of the outlet channel.

[0025] It should be noted that arranging the longer inlet channels on opposite sides of the liquid cooling plate ensures that the coolant is fully distributed before entering the main heat exchange zone, while the shorter central outlet channel collects and flows out, which helps to establish a stable and uniform flow field.

[0026] In some alternative embodiments, the box body includes a lid, a frame, and a protective panel, with the lid and the protective panel respectively located on opposite sides of the frame, and the lid, frame, and protective panel forming a receiving cavity.

[0027] The liquid cooling plate is located between the battery cell assembly and the protective plate.

[0028] It should be noted that the three-layer structure separates the load-bearing (frame), sealing (the joint surface with the cover and bottom plate), and protective functions. This modular design makes assembly, inspection, and maintenance very convenient. For example, the bottom protective plate can be removed separately to inspect or replace the liquid cooling plate, or the cover can be opened to directly access the battery cells without damaging the entire enclosure.

[0029] In some alternative embodiments, the enclosure further includes a first sealing ring and a second sealing ring, the first sealing ring being located between the enclosure cover and the frame, and the second sealing ring being located between the frame and the protective plate.

[0030] It should be noted that by placing sealing rings between each layer, multiple sealing barriers are formed. This design greatly improves the battery pack's sealing rating (IP rating), effectively preventing the intrusion of water, vapor, and dust, ensuring the safety of the cells and electrical components, and extending the battery pack's lifespan.

[0031] In addition, this application also provides an electrical device including the aforementioned battery pack.

[0032] The battery pack and electrical equipment provided in this application include the aforementioned battery pack; the battery pack includes a housing with a receiving cavity; a cell assembly housed within the receiving cavity; and a liquid cooling assembly including a liquid cooling plate with a liquid cooling channel for coolant flow, and the liquid cooling plate is used for heat exchange of the cell assembly; the liquid cooling plate is provided with an inlet and an outlet, which are spaced apart along the length of the housing.

[0033] By arranging the inlet and outlet of the coolant at intervals along the length of the housing, the coolant can flow through most of the liquid cooling plate, which helps to form a longer and wider heat exchange path, thereby improving the temperature uniformity of the battery pack in different directions, avoiding local overheating, and achieving efficient thermal management of the battery pack in a limited space. Attached Figure Description

[0034] The above and other objects, features, and advantages of embodiments of this application will become more readily understood through the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application will be described by way of example and non-limitation, wherein:

[0035] Figure 1 This is a schematic diagram of the exploded structure of the battery pack according to an embodiment of this application;

[0036] Figure 2 This is a partial schematic diagram of a battery pack according to an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of the liquid cooling plate in the battery pack according to an embodiment of this application;

[0038] Figure 4 This is a cross-sectional view of the assembly of the liquid cooling plate and the housing in the battery pack of this application embodiment.

[0039] Figure label:

[0040] 100-battery pack;

[0041] 110 - Enclosure;

[0042] 111-Hanging lug;

[0043] 112 - Box lid;

[0044] 113-Framework;

[0045] 114 - Protective plate;

[0046] 115 - First sealing ring;

[0047] 116 - Second sealing ring;

[0048] 120 - Battery cell assembly;

[0049] 130-Liquid Cooling Plate;

[0050] 131 - Liquid cooling channel;

[0051] 1311 - Liquid inlet channel;

[0052] 1312 - Liquid outlet channel;

[0053] 132 - Liquid Inlet;

[0054] 133-liquid outlet;

[0055] 140 - Electrical Warehouse;

[0056] 141-First Electrical Warehouse;

[0057] 142 - Second Electrical Warehouse;

[0058] 150-Large flange rivet nut;

[0059] 160 - Bolt parts. Detailed Implementation

[0060] 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. All other obtained embodiments are within the scope of protection of this application. In the absence of conflict, the following embodiments and features can be combined with each other.

[0061] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0062] 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.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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. 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.

[0064] In conceiving and implementing this application, the applicant discovered at least the following problems: Existing power battery packs typically employ a traditional liquid cooling system and an integrated housing design. The liquid cooling system directly contacts the module through a cold plate, utilizing coolant circulation for thermal management.

[0065] In terms of thermal management, the flow channel design of existing cold plates relies heavily on empirical layout, lacking refined simulation verification for module distribution. This results in uneven coolant flow rate distribution and insufficient heat dissipation efficiency in local areas, making it difficult to meet the rapid temperature control requirements of high-energy-density battery packs. At the same time, to meet thermal management performance requirements, the thickness of the cold plate and the complexity of the flow channels are often over-designed, further exacerbating space occupation and cost issues.

[0066] The battery pack proposed in this application, by arranging the inlet and outlet of the liquid coolant at intervals along the length of the housing, allows the coolant to flow through most of the liquid cooling plate area, which helps to form a longer and wider heat exchange path, thereby improving the temperature uniformity of the battery pack in different directions, avoiding local overheating, and achieving efficient thermal management of the battery pack in a limited space.

[0067] The battery pack provided in this application will be described in detail below with reference to specific embodiments.

[0068] Figure 1 This is an exploded view of the battery pack according to an embodiment of this application. Figure 2 This is a partial schematic diagram of the battery pack according to an embodiment of this application. Figure 3 This is a schematic diagram of the liquid cooling plate in the battery pack according to an embodiment of this application.

[0069] like Figures 1 to 3 As shown in the figure, this application embodiment proposes a battery pack 100, including:

[0070] Box 110 has a receiving cavity;

[0071] The battery cell assembly 120 is housed within the receiving cavity;

[0072] The liquid cooling assembly includes a liquid cooling plate 130, which has a liquid cooling channel 131 for the flow of coolant, and is used to exchange heat with the cell assembly 120.

[0073] The liquid cooling plate 130 is provided with a liquid inlet 132 and a liquid outlet 133, which are spaced apart along the length of the housing 110.

[0074] It is understandable that the purpose of the containment cavity is to house the battery. It is also easy to understand that the containment cavity is sealed to prevent side reactions from occurring inside the battery cell, which could affect the cell's performance.

[0075] For example, the size or shape of the receiving cavity is matched with the size and shape of the battery. Specifically, it can be adjusted according to the actual situation. This application embodiment does not impose too many limitations here.

[0076] In this embodiment, the battery can be configured as a rectangular structure. The battery can be located inside the housing 110.

[0077] Understandably, housing 110 can be used to support the battery.

[0078] The dimensions of the aforementioned housing 110 can be set according to actual needs, and this embodiment of the application does not impose any restrictions on them.

[0079] In addition, it should be noted that the shape of the box 110 is not limited in this embodiment. For example, the box 110 can be a regular shape such as a cuboid or a cylinder. Of course, the box 110 can also be other irregular shapes.

[0080] In one possible implementation, the housing 110 can be a rectangular structure, and the size of the housing 110 can be greater than or equal to the size of the battery, so that the housing 110 can carry the battery.

[0081] It should be noted that the battery cell assembly 120 is composed of multiple battery cells (which can be square, cylindrical or pouch batteries) connected in series and parallel, and the whole assembly is housed in the receiving cavity of the housing 110.

[0082] The liquid cooling system is used to cool or heat the battery cell assembly 120 during operation to maintain it within its optimal operating temperature range. The core of the liquid cooling system is the liquid cooling plate 130, which is located at the bottom of the battery cell assembly 120. The liquid cooling plate 130 has liquid cooling channels 131 machined inside for the flow of coolant.

[0083] The liquid cooling plate 130 has liquid cooling channels 131, which can effectively remove the heat generated by the battery through the coolant. Liquid cooling technology is generally more efficient than air cooling, and can reduce the battery temperature faster, prevent overheating, and improve battery efficiency and lifespan.

[0084] The liquid cooling plate 130 is provided with an inlet 132 and an outlet 133, which are spaced apart along the length of the housing 110. External cooling pipes are connected to the inlet 132 and the outlet 133 respectively. The coolant flows in from the inlet 132, flows through the flow channel inside the entire liquid cooling plate 130, and flows out from the outlet 133, exchanging heat with the battery cell assembly 120 above it during this process.

[0085] Furthermore, by arranging the inlet 132 and outlet 133 at intervals along the length of the housing 110, the coolant is forced to flow through most of the length of the battery pack 100, forming a longer and wider heat exchange path. This effectively solves the problem of insufficient cooling of the cell assembly 120 at the far end of the housing 110, significantly improves the temperature uniformity of the cell assembly 120 in the battery pack 100, avoids local overheating or overcooling, and thus extends the overall lifespan and safety of the battery pack 100.

[0086] The liquid inlet 132 and liquid outlet 133 are arranged in one dimension of the housing 110, which facilitates centralized docking with the external cooling system, reduces the bending and detour of external pipelines, and reduces installation complexity and potential leakage risk.

[0087] With the above configuration, namely, by arranging the inlet 132 and outlet 133 at intervals along the length of the housing 110, the coolant can flow through most of the area of ​​the liquid cooling plate 130, which helps to form a longer and wider heat exchange path, thereby improving the temperature uniformity along the length of the battery pack 100, avoiding local overheating, and achieving efficient thermal management of the battery pack in a limited space.

[0088] In some alternative embodiments, the housing 110 is provided with at least two lifting lugs 111, the at least two lifting lugs 111 being located on the same side of the housing 110, and one of the at least two lifting lugs 111 being located between the liquid inlet 132 and the liquid outlet 133.

[0089] It should be noted that by placing the lifting lug 111 between the liquid inlet 132 and the liquid outlet 133, the area in the middle of the liquid cooling plate 130, which usually has high structural strength, is fully utilized. This avoids direct interference between the lifting lug 111 and the joint of the liquid cooling pipeline, ensuring both the stability and safety of the hoisting and simplifying the layout of the external pipeline.

[0090] Specifically, the layout cleverly utilizes the valuable space between the inlet and outlet 133 to set up the lifting lug 111, avoiding spatial interference between the lifting lug 111 and the connector of the liquid cooling pipeline, making the external structure of the battery pack 100 more compact and neat.

[0091] Furthermore, placing the lifting lug 111 between the two interfaces typically means that the lifting lug 111 is located in the central area of ​​the enclosure 110 where the structural strength is relatively high. This allows the force to be transmitted more evenly to the main structure of the enclosure 110 during hoisting, avoiding the hoisting force from being directly applied to the relatively fragile liquid cooling interfaces or the corners of the enclosure 110, thus improving the stability and safety of the hoisting process.

[0092] It should be noted that, for ease of lifting and transportation, two lifting lugs 111 are provided on the same side of the container 110. Ingeniously, one of the lifting lugs 111 is located precisely between the liquid inlet 132 and the liquid outlet 133. This layout avoids spatial conflicts between the lifting lug 111 and the pipe fittings, resulting in a more compact structure, while also utilizing the better stress distribution in the middle of the container 110.

[0093] In some embodiments, the lifting lug 111 is a stamped part that is welded to the frame 113 of the housing 110.

[0094] In some alternative embodiments, the battery pack 100 also includes at least two electrical compartments 140, which are located at different positions within the receiving cavity.

[0095] It should be noted that by setting up multiple electrical compartments 140 and distributing them in different positions within the housing, the functional modules are arranged in a distributed manner, which is beneficial for optimizing the internal space utilization of the enclosure 110, facilitating the management of wiring harness routing, and potentially shortening the length of internal high-voltage connectors.

[0096] Furthermore, by distributing multiple electrical components within different electrical compartments 140, the layout limitations of a traditional single electrical compartment 140 are broken, achieving functional modularization. By fully utilizing the vehicle's overall space and employing an irregularly shaped protruding design for the electrical compartment 140, the overall energy density of the battery pack is increased, the overall manufacturing cost is reduced, and space utilization is greatly optimized, freeing up more space for the battery cell assembly 120 or making the housing 110 structure more compact.

[0097] Furthermore, the distributed arrangement can shorten the length of high-voltage sampling lines and communication harnesses at different locations from the electrical compartment 140 to the cell assembly 120, reducing harness tangling and lowering internal resistance and signal interference. At the same time, it avoids concentrated heat generation from all electrical components, which is beneficial for heat dissipation.

[0098] It should be noted that at least two electrical compartments 140 are used to house electrical components such as the battery management system (BMS), fuses, contactors, and sampling harness interfaces.

[0099] like Figure 1 and Figure 2 As shown, in some alternative embodiments, at least two electrical compartments 140 include a first electrical compartment 141 and a second electrical compartment 142;

[0100] The first electrical compartment 141 is located on the first side of the housing 110 along the length of the housing 110, and the first electrical compartment 141 extends along the width of the housing 110.

[0101] The second electrical compartment 142 is located on the second side of the housing 110 along the width direction of the housing 110, and the second electrical compartment 142 extends along the length direction of the housing 110.

[0102] It should be noted that the space around and on the sides of the box 110 is fully utilized, which is a three-dimensional space utilization solution that makes the internal layout very efficient and orderly.

[0103] Understandably, this structure partitions different electrical functions. For example, the main control unit (BMU) can be placed in the first electrical compartment 141, while power components such as fuses and contactors can be placed in the second electrical compartment 142, achieving separation of strong and weak currents or functional separation, thereby improving safety and EMC (electromagnetic compatibility) performance.

[0104] like Figure 2 As shown, the electrical compartment 140 includes a first electrical compartment 141 and a second electrical compartment 142. The first electrical compartment 141 is located on the first side of the housing 110 along the length direction X of the housing 110, and it is a strip structure that extends along the width direction Y of the housing 110.

[0105] The second electrical compartment 142 is located on the second side of the housing 110 along the width direction Y, and extends along the length direction X of the housing 110. This design, which places the electrical functional modules on different sides, greatly optimizes the internal space and wiring harness layout.

[0106] like Figure 1 and Figure 2 As shown, in some alternative embodiments, the extension dimension of the second electrical compartment 142 along the length direction of the housing 110 is smaller than the extension dimension of the second side of the housing 110.

[0107] It should be noted that this design gives the battery pack 100 greater design flexibility and scalability, making it easier to iterate on subsequent models or adapt to the needs of different customers, and making full use of the vehicle's layout space.

[0108] Furthermore, along the length direction X of the housing 110, the extension dimension of the second electrical compartment 142 (i.e., its length L1) is smaller than the extension dimension of the second side of the housing 110 (i.e., the total length L2 of that side). The length of the second electrical compartment 142 is intentionally shortened, and the space reserved next to it (the L2-L1 area in the attached drawings) can be used to match the layout of the entire vehicle.

[0109] In some alternative embodiments, the liquid cooling channel 131 includes a liquid inlet channel 1311 and a liquid outlet channel 1312 that are connected together. There are at least two liquid inlet channels 1311 and at least two liquid outlet channels 1312. The liquid inlet 132 is connected to the liquid inlet channel 1311 and the liquid outlet 133 is connected to the liquid outlet channel 1312.

[0110] It should be noted that the design using multiple inlet channels 1311 and multiple outlet channels 1312 can be considered as a multi-inlet and multi-outlet or parallel flow channel layout. This design can distribute the coolant more evenly to various areas of the liquid cooling plate 130, further reducing the temperature difference between different battery cells.

[0111] Understandably, the multi-inlet flow channel 1311 and the multi-outlet flow channel 1312 constitute a parallel flow channel system with multiple inlets and outlets. The coolant is split at the inlet and converged at the outlet, which is equivalent to dividing a large-area liquid cooling plate 130 into multiple small, parallel cooling areas, solving the problem of large temperature difference between the front and rear ends in a single flow channel and achieving temperature uniformity.

[0112] like Figures 1 to 3 As shown, in some optional embodiments, at least two liquid inlet channels 1311 are located on opposite sides of the liquid cooling plate 130, and the length of the liquid inlet channel 1311 is greater than the length of the liquid outlet channel 1312.

[0113] It should be noted that arranging the longer inlet channel 1311 on opposite sides of the liquid cooling plate 130 ensures that the coolant is fully distributed before entering the main heat exchange zone, while the shorter central outlet channel 1312 collects and flows out, which is conducive to establishing a stable and uniform flow field.

[0114] By arranging the longer inlet channels 1311 on both sides, it is ensured that the coolant must reach the edge area of ​​the liquid cooling plate 130 that is furthest from the inlet and outlet ports 133 before entering the core heat exchange area, thus ensuring that even the parts of the entire heat exchange surface that are difficult to cool can receive sufficient coolant supply.

[0115] The long inlet and short outlet structure facilitates the formation of a stable flow field pattern where the coolant flows from both sides towards the center and from the far end towards the near end. When the coolant flows in the long inlet channel 1311, the pressure and flow velocity are initially balanced, and then it is quickly discharged through the short outlet channel 1312, reducing flow resistance and pressure loss and improving cooling efficiency.

[0116] It should be noted that the working process is as follows: After the coolant enters through the inlet 132, it is diverted into two longer inlet channels 1311 on the left and right, thus fully covering the two edge areas of the liquid cooling plate 130; then the coolant turns at the end of the channels, flowing from both sides towards the center, entering the shorter central outlet channel 1312, and finally exiting from the outlet 133. This design effectively promotes the uniform distribution of coolant on the plate surface, reduces flow dead zones, and achieves a more uniform temperature control effect for the battery cell assembly 120.

[0117] Figure 4 This is a cross-sectional view of the assembly of the liquid cooling plate and the housing in the battery pack of this application embodiment.

[0118] like Figures 1 to 4 As shown, in some optional embodiments, the box 110 includes a box cover 112, a frame 113 and a protective plate 114. The box cover 112 and the protective plate 114 are respectively disposed on opposite sides of the frame 113, and the box cover 112, the frame 113 and the protective plate 114 form a receiving cavity.

[0119] The liquid cooling plate 130 is located between the cell assembly 120 and the protective plate 114.

[0120] It should be noted that the three-layer structure separates the load-bearing (frame 113), sealing (the mating surface with the cover 112 and the bottom plate), and protective functions. This modular design makes assembly, inspection, and maintenance very convenient. For example, the bottom protective plate 114 can be removed separately to inspect or replace the liquid cooling plate 130, or the cover 112 can be opened to directly access the battery cells without damaging the entire enclosure 110.

[0121] Furthermore, the housing 110 constitutes the external structure of the battery pack 100, and an internal cavity is formed therein. In this embodiment, the housing 110 adopts a modular design, including a cover 112, a frame 113, and a protective plate 114.

[0122] In some embodiments, the cover 112 and the protective plate 114 are respectively installed on the upper and lower sides of the frame 113 by bolts or other fasteners, thereby jointly forming a receiving cavity. The protective plate 114 is mainly used for bottom protection and installation support.

[0123] Furthermore, the frame 113 bears the main structural strength, the bottom protective plate 114 is specifically designed to cope with impacts and scratches at the bottom, and the liquid cooling plate 130 is protected between the battery cell and the protective plate 114, resulting in higher safety and reliability.

[0124] In some embodiments, the liquid cooling plate 130 is fixed to the bottom of the frame 113 by the large flange rivet nut 150, and the protective plate 114 is connected to the large flange rivet nut 150 by bolts 160.

[0125] like Figures 1 to 3 As shown, in some optional embodiments, the housing 110 further includes a first sealing ring 115 and a second sealing ring 116, the first sealing ring 115 being located between the housing cover 112 and the frame 113, and the second sealing ring 116 being located between the frame 113 and the protective plate 114.

[0126] It should be noted that by setting sealing rings between each layer, multiple sealing barriers are formed. This design greatly improves the sealing rating (IP rating) of the battery pack 100, effectively preventing the intrusion of water, vapor, and dust, ensuring the safety of the battery cells and electrical components, and extending the service life of the battery pack 100.

[0127] Specifically, a first sealing ring 115 (such as a rubber O-ring or a shaped sealing ring) is provided at the mating surface between the cover 112 and the frame 113. A second sealing ring 116 is provided at the mating surface between the frame 113 and the protective plate 114. The first sealing ring 115 and the second sealing ring 116 are pressed between their respective mating surfaces, forming two independent sealing lines that together ensure the airtightness and watertightness of the containment cavity, meeting higher-level protection requirements.

[0128] The layered enclosure 110 structure and the partitioned electrical compartments 140 make the assembly, maintenance and replacement of the battery pack 100 more convenient. For example, the protective plate 114 can be removed separately to inspect the liquid cooling plate 130 or replace the cell assembly 120 without damaging the entire enclosure 110 structure.

[0129] The battery pack provided in this application includes a housing with a receiving cavity; a battery cell assembly housed in the receiving cavity; and a liquid cooling assembly including a liquid cooling plate with a liquid cooling channel for coolant flow, and the liquid cooling plate is used to exchange heat with the battery cell assembly; the liquid cooling plate is provided with an inlet and an outlet, which are spaced apart along the length of the housing.

[0130] By arranging the inlet and outlet of the coolant at intervals along the length of the housing, the coolant can flow through most of the liquid cooling plate, which helps to form a longer and wider heat exchange path, thereby improving the temperature uniformity of the battery pack in different directions, avoiding local overheating, and achieving efficient thermal management of the battery pack in a limited space.

[0131] In addition, this application embodiment also provides an electrical device, including a battery pack 100.

[0132] It should be noted that the electrical equipment can be, but is not limited to, electric vehicles, electric buses, electric trucks, electric construction machinery, energy storage containers, uninterruptible power supplies (UPS), electric ships, or electric aircraft. Because this electrical equipment utilizes the aforementioned safe, reliable, and structurally robust battery pack 100, its overall safety and reliability are enhanced.

[0133] It should be noted that the specific structure of the battery pack 100 will not be discussed in detail here; please refer to the above.

[0134] 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.

[0135] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack (100), characterized in that, include: The housing (110) has a receiving cavity; The battery cell assembly (120) is housed within the receiving cavity; A liquid cooling assembly, the liquid cooling assembly including a liquid cooling plate (130), the liquid cooling plate (130) having a liquid cooling channel (131) for coolant flow, and the liquid cooling plate (130) for heat exchange of the battery cell assembly (120); The liquid cooling plate (130) is provided with an inlet (132) and an outlet (133), and the inlet (132) and the outlet (133) are spaced apart along the length of the housing (110).

2. The battery pack (100) according to claim 1, characterized in that, The housing (110) is provided with at least two lifting lugs (111), the at least two lifting lugs (111) are located on the same side of the housing (110), and one of the at least two lifting lugs (111) is located between the liquid inlet (132) and the liquid outlet (133).

3. The battery pack (100) according to claim 1, characterized in that, The battery pack (100) also includes at least two electrical compartments (140), which are located at different positions in the receiving cavity.

4. The battery pack (100) according to claim 3, characterized in that, At least two electrical compartments (140) include a first electrical compartment (141) and a second electrical compartment (142); The first electrical compartment (141) is located on the first side of the box (110) along the length direction of the box (110), and the first electrical compartment (141) extends along the width direction of the box (110); The second electrical compartment (142) is located on the second side of the housing (110) along the width direction of the housing (110), and the second electrical compartment (142) extends along the length direction of the housing (110).

5. The battery pack (100) according to claim 4, characterized in that, Along the length of the housing (110), the extension dimension of the second electrical compartment (142) is smaller than the extension dimension of the second side of the housing (110).

6. The battery pack (100) according to any one of claims 1-5, characterized in that, The liquid cooling channel (131) includes a liquid inlet channel (1311) and a liquid outlet channel (1312) that are connected. There are at least two liquid inlet channels (1311) and at least two liquid outlet channels (1312). The liquid inlet (132) is connected to the liquid inlet channel (1311), and the liquid outlet (133) is connected to the liquid outlet channel (1312).

7. The battery pack (100) according to claim 6, characterized in that, At least two of the liquid inlet channels (1311) are located on opposite sides of the liquid cooling plate (130), and the length of the liquid inlet channel (1311) is greater than the length of the liquid outlet channel (1312).

8. The battery pack (100) according to any one of claims 1-5, characterized in that, The box body (110) includes a box cover (112), a frame (113) and a protective plate (114). The box cover (112) and the protective plate (114) are respectively disposed on opposite sides of the frame (113). The box cover (112), the frame (113) and the protective plate (114) form the receiving cavity. The liquid cooling plate (130) is located between the cell assembly (120) and the protective plate (114).

9. The battery pack (100) according to claim 8, characterized in that, The housing (110) also includes a first sealing ring (115) and a second sealing ring (116). The first sealing ring (115) is located between the housing cover (112) and the frame (113), and the second sealing ring (116) is located between the frame (113) and the protective plate (114).

10. An electrical appliance, characterized in that, Includes the battery pack (100) as described in any one of claims 1 to 9.

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