Liquid-cooled battery pack

Abstract

The utility model relates to battery structure technical field especially relates to a liquid -cooled battery pack. The battery pack includes: protection subassembly is provided with containing cavity, module is embedded in containing cavity, wherein, the module includes the location shell and the electric core, a plurality of electric core is mutually spaced and is arranged in the shell cavity of location shell, the both ends end face of location shell is provided with the first via hole that links the inside and outside of shell cavity respectively, a plurality of module is along the axial interval arrangement of containing cavity. In the utility model, the protection subassembly is set to the structure of outer square inner circle, improves the anti -ball and side -to -side performance, sets up a plurality of module along the axial interval arrangement of containing cavity, can provide the passage for cooling liquid from one end of containing cavity to the other end of containing cavity, ensures that all electric core can immerse in cooling liquid, avoids the heat accumulation in the battery pack, ensures that the electric core is always in the proper temperature range when working.

Description

Technical Field

[0001] This utility model relates to the field of battery structure technology, and in particular to a liquid-cooled battery pack. Background Technology

[0002] Currently, electric vehicles are becoming increasingly popular. As the driving range of electric vehicles increases, the capacity and charging speed of the battery, as the power source, have become key performance parameters. Existing technologies significantly improve battery capacity and charging speed by integrating multiple cells into a battery pack.

[0003] As a high-energy-density energy storage component in electric vehicles, the safety of the battery pack structure is crucial. Since battery packs are typically located in the chassis area of ​​electric vehicles, they are highly susceptible to collisions. Therefore, most existing battery packs employ buffer springs or elastic structures for protection, resulting in a complex outer casing that is difficult to install, disassemble, and maintain.

[0004] Furthermore, when batteries are charged at high rates, they generate a lot of heat, which can easily create an extremely high temperature environment inside the battery pack, and even cause thermal runaway, resulting in a significant reduction in the performance and lifespan of the battery cells.

[0005] Therefore, it is necessary to optimize the structure of the battery pack so that it has both high impact resistance and high heat dissipation efficiency. Utility Model Content

[0006] This invention aims to solve the technical problems existing in related technologies. To this end, this invention proposes a liquid-cooled battery pack, which optimizes the battery pack structure to improve its impact resistance and heat dissipation efficiency, thereby extending its service life.

[0007] This utility model provides a liquid-cooled battery pack, comprising: A protective component, wherein the protective component is configured as a square column structure having a cylindrical receiving cavity; The module is embedded in the receiving cavity; The module includes a positioning shell and battery cells, with several battery cells arranged at intervals within the cavity of the positioning shell. The two end faces of the positioning shell are respectively provided with a first through hole connecting the inside and outside of the shell cavity, and several modules are arranged at intervals along the axial direction of the receiving cavity.

[0008] According to the present invention, a liquid-cooled battery pack is provided, wherein the positioning shell is configured as two symmetrically installed covers, one end of each cover has a cavity, and a first positioning rod for fixing the battery cell is provided in the cavity.

[0009] According to the present invention, a liquid-cooled battery pack is provided, wherein the first through hole is disposed on the other end face of the cover and communicates with the cavity; Multiple first positioning rods are spaced apart along the edge of the first through hole for clamping the battery cell.

[0010] According to the present invention, a liquid-cooled battery pack is provided with a step on the side of the first positioning rod. The step is located at the end of the first positioning rod that is connected to the first through hole and faces the first through hole.

[0011] According to the present invention, a liquid-cooled battery pack is provided in which the positioning shell is provided with a second positioning rod for separating adjacent modules. The second positioning rod is disposed on the other end face of the cover and extends from the end face of the cover in a direction away from the cover.

[0012] According to the present invention, a liquid-cooled battery pack is provided, the protection component comprising: The support frame is configured as a cuboid with a groove on one side, the groove having a semi-circular cross-section, and the groove extending from one end of the support frame to the other end of the support frame; The mounting plate is equipped with liquid inlets that run through both sides; The two support frames are spliced ​​together with the groove facing each other and the mounting plates are respectively provided at both ends. The liquid inlet coincides with the central axis of the groove.

[0013] According to the present invention, a liquid-cooled battery pack further includes a sealing layer that covers and is disposed on the outer periphery of the module.

[0014] According to the present invention, a liquid-cooled battery pack further includes a heat insulation layer, which is disposed on the outer periphery of the sealing layer.

[0015] According to the present invention, a liquid-cooled battery pack further includes a sealing gasket, which is sandwiched between the mounting plate and the module.

[0016] According to the present invention, a liquid-cooled battery pack is provided in which the module is interference-fitted with the receiving cavity through the sealing gasket and the sealing layer.

[0017] The above-mentioned one or more technical solutions of this utility model have at least one of the following technical effects: setting the protective component as an outer square and inner circle structure improves the performance of ball impact and side impact protection; setting several modules arranged at intervals along the axial direction of the receiving cavity can provide a channel for the coolant to flow from one end of the receiving cavity to the other end of the receiving cavity, ensuring that all battery cells can be immersed in the coolant, avoiding heat accumulation in the battery pack, and ensuring that the battery cells are always in a suitable temperature range when they are working.

[0018] In addition to the technical problems solved by this utility model, the technical features of the technical solutions constituted by this utility model, and the advantages brought about by these technical features, as described above, other technical features of this utility model and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings, or can be learned through the practice of this utility model. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 An exploded view of the battery pack provided in an embodiment of this utility model.

[0021] Figure 2 This is a three-dimensional structural diagram of the battery pack provided in an embodiment of the present utility model.

[0022] Figure 3 This is a front view of the battery pack provided in an embodiment of the present invention.

[0023] Figure 4 for Figure 3 A cross-sectional view of section AA of the battery pack.

[0024] Figure 5 An exploded view of the module provided in an embodiment of this utility model.

[0025] Figure 6 A three-dimensional structural diagram of the cover provided in an embodiment of this utility model. Figure label: 100. Protective component; 110. Receiving cavity; 120. Support frame; 130. Mounting plate; 131. Liquid inlet; 200. Module; 210. Positioning shell; 211. Cover; 212. First through hole; 213. First positioning rod; 214. Step; 215. Second positioning rod; 220. Battery cell; 300. Sealing layer; 400. Heat insulation layer; 500. Sealing gasket. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] In an embodiment of this utility model, a liquid-cooled battery pack is described.

[0028] like Figure 1 and Figure 2 As shown, the battery pack mainly includes a protection component 100 and a module 200.

[0029] The protection assembly 100 is configured as a square column structure with a cylindrical receiving cavity 110. Specifically, the exterior of the protection assembly 100 is configured as a square column, which has a strong resistance to ball impacts and side impacts. The cylindrical receiving cavity 110 inside the protection assembly 100 gives the battery pack a high pressure resistance, thereby improving the heat dissipation efficiency of the battery pack by increasing the pressure and flow rate of the coolant.

[0030] Preferably, the protective component 100 can be made of high-strength aluminum alloy (such as 6061 or 7075 aluminum alloy) to ensure structural strength while also meeting the requirements of lightweight design. The square outer contour design helps to disperse the impact force and reduce local stress concentration, while the cylindrical inner cavity facilitates the uniform distribution of coolant and improves heat dissipation uniformity.

[0031] The protection component 100 has a liquid inlet 131 at each end, which communicates with the receiving cavity 110. The diameter of the liquid inlet 131 can be adjusted according to the coolant flow rate requirements to ensure sufficient circulation.

[0032] Module 200 is embedded in receiving cavity 110. The external shape of module 200 is set as a cylinder adapted to receive cavity 110. Module 200 includes positioning shell 210 and battery cells 220. A plurality of battery cells 220 are arranged at intervals within the shell cavity of positioning shell 210. Figure 4 and Figure 5 As shown, the battery cell 220 is arranged parallel to the axial direction of the positioning shell 210. Multiple battery cells 220 are aligned at their ends within the cavity of the positioning shell 210. The battery cell 220 can be a cylindrical lithium-ion cell with a spacing of 1mm to 5mm, which ensures both a compact structure and sufficient space for coolant flow.

[0033] The positioning shell 210 has a first through hole 212 on each of its two end faces, connecting the inside and outside of the shell cavity. The diameter of the first through hole 212 can be set in a specific ratio to the diameter of the battery cell to ensure that the coolant fully covers the end face of the battery cell. The first through hole 212 facilitates the entry and exit of coolant into and out of the positioning shell 210, improves the battery heat dissipation efficiency, and thus ensures that the battery is always kept within a suitable temperature range during use.

[0034] Several modules 200 are arranged at intervals along the axial direction of the receiving cavity 110 to form a flow channel through both ends of the receiving cavity 110, so that the coolant can flow through each module 200 sequentially from the liquid inlet 131. This solves the problem of heat generation and uneven temperature of the cell 220 when charging at a high charging rate, and improves the battery life.

[0035] Furthermore, such as Figure 1 , Figure 5 and Figure 6 As shown, the positioning shell 210 can be configured as two symmetrically mounted covers 211. One end of each cover 211 has a recess. The covers 211 can be made of engineering plastics (such as PA66+30%GF) or aluminum alloy, possessing good mechanical strength and insulation properties. The depth of the recess is slightly greater than half the length of the battery cell to ensure that the battery cell is completely fixed when the two covers 211 are closed. Thus, the battery cell 220 can be installed and replaced simply by interlocking or separating the two covers 211, greatly reducing the difficulty of assembling and disassembling the module 200.

[0036] In order to maintain a stable gap between the battery cell 220 and the positioning shell 210, a first positioning rod 213 is also provided in the cavity of the cover 211. The first positioning rod 213 extends from the bottom of the cavity to the opening along the axial direction of the cover 211.

[0037] Multiple first positioning rods 213 are arranged circumferentially to form a plug-in structure for fixing the end of the battery cell 220.

[0038] Furthermore, a first through hole 212 is provided on the other end face of the cover 211. And, the first through hole 212 communicates with the cavity.

[0039] Multiple first positioning rods 213 are spaced apart along the edge of the first through hole 212 for clamping the battery cell 220. The arrangement of the first positioning rods 213 can be adjusted according to the shape of the battery cell. For example, when the battery cell is cylindrical, the multiple first positioning rods 213 are arranged in a ring; or, when the battery cell is rectangular, the multiple first positioning rods 213 are arranged in a matrix.

[0040] Preferably, the first positioning rod 213 extends axially along the cover 211. A step 214 is provided on the side of the first positioning rod 213. The step 214 is located at the end of the first positioning rod 213 that is connected to the first through hole 212.

[0041] Furthermore, the step 214 is located on the side of the first positioning rod 213 facing the first through hole 212, which ensures that when the battery cell 220 is embedded in the cover 211, the end of the battery cell 220 maintains a certain distance from the first through hole 212. In this way, the end face of the battery cell 220 can also be completely immersed in the coolant, improving the heat exchange efficiency of the battery cell 220.

[0042] In this embodiment, the protective component 100 is configured with an outer square and inner circle structure, which improves the performance against ball impacts and side collisions. Several modules 200 are arranged at intervals along the axial direction of the receiving cavity 110, which can provide a channel for the coolant to flow from one end of the receiving cavity 110 to the other end of the receiving cavity 110, ensuring that all cells 220 can be immersed in the coolant, avoiding heat accumulation in the battery pack, and ensuring that the cells 220 are always within a suitable temperature range when they are working.

[0043] Based on the above embodiments, another embodiment of the present invention introduces a liquid-cooled battery pack.

[0044] like Figures 1 to 3 As shown, in order to achieve an interference fit between the module 200 and the protection component 100, and at the same time reduce the difficulty of assembly and disassembly operations, the cylindrical receiving cavity 110 of the protection component 100 is configured to be formed by splicing two cuboids with grooves.

[0045] Specifically, the protection assembly 100 includes a support frame 120 and a mounting plate 130. The support frame 120 is configured as a cuboid with a groove on one side. The groove has a semi-circular cross-section. The groove extends from one end of the support frame 120 to the other end. The mounting plate 130 is provided with liquid inlets 131 extending through both sides.

[0046] Two support frames 120 are joined together with grooves facing each other. The ends of the two support frames 120 are connected using mounting plates 130. The mounting plates 130 are connected to the support frames 120 by bolts, with 4 to 8 bolts evenly distributed around the perimeter of the mounting plates 130. The liquid inlet 131 coincides with the central axis of the groove.

[0047] In this embodiment, the protective component 100 has a simple structure, is easy to disassemble and install, is easy to process, and has a low manufacturing cost; and by optimizing the structure of the protective component 100, the anti-collision performance of the battery pack is improved, which can reduce the damage to the battery cell 220 caused by collision and improve the service life of the battery cell 220.

[0048] Based on the above embodiments, another embodiment of the present invention introduces a liquid-cooled battery pack.

[0049] In order to ensure that a flow channel is formed between the two ends of the receiving cavity 110 among the multiple positioning shells 210, a second positioning rod 215 is also provided on the end face of the positioning shell 210 to ensure that adjacent positioning shells 210 are spaced apart.

[0050] like Figure 4 and Figure 5 As shown, the positioning shell 210 is provided with a second positioning rod 215 for separating adjacent modules 200. The second positioning rod 215 is provided on the other end face of the cover 211. Furthermore, the second positioning rod 215 extends from the end face of the cover 211 in a direction away from the cover 211. The number of second positioning rods 215 is 3 to 6, and they are evenly distributed circumferentially along the end face of the cover 211.

[0051] Furthermore, a second through hole is provided on the end face of the positioning shell 210. The diameter of the second through hole is smaller than the diameter of the first through hole 212. When the positioning shell 210 contains a battery cell 220, the second through hole allows the coolant located between adjacent battery cells 220 to flow out directly, reducing the flow resistance of the coolant.

[0052] Based on the above embodiments, another embodiment of the present invention introduces a liquid-cooled battery pack.

[0053] like Figure 1 As shown in Figure 4, the battery also includes a sealing layer 300. The sealing layer 300 covers and is disposed on the outer periphery of the module 200. The sealing layer 300 is made of elastic rubber. The sealing layer 300 is cylindrical, so that it can be directly fitted onto the outer periphery of the module 200.

[0054] Alternatively, to reduce assembly difficulty, the sealing layer 300 can be made rectangular. In this way, the rectangular sealing layer 300 can be rolled around the outer periphery of the module 200 to cover the module 200.

[0055] Meanwhile, the rubber sealing layer 300 can undergo elastic deformation under the compression of the support frame 120, realizing the interference fit between the module 200 and the protection component 100, preventing the module 200 from moving within the receiving cavity 110 when it is impacted, thereby improving the ball-strike and collision protection performance of the protection component 100.

[0056] Furthermore, the battery pack also includes a heat insulation layer 400. The heat insulation layer 400 is disposed around the outer periphery of the sealing layer 300 to ensure that the temperature inside the battery pack is isolated from the outside environment and to improve heat exchange efficiency.

[0057] Preferably, the battery pack is provided with two heat insulation layers 400, which can better prevent heat transfer between the support frame 120 and the module 200.

[0058] The battery pack also includes a sealing gasket 500. The sealing gasket 500 is annular and made of rubber. The sealing gasket 500 is sandwiched between the mounting plate 130 and the module 200. The module 200 is interference-fitted with the receiving cavity 110 via the sealing gasket 500.

[0059] In this embodiment, by setting a sealing layer 300, a heat insulation layer 400, and a sealing gasket 500, the sealing performance of the battery pack is improved, preventing coolant leakage. At the same time, the heat insulation performance of the battery pack is also improved, ensuring stable temperature inside the battery pack and extending the service life of the battery pack.

[0060] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model 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. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0061] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0062] In this embodiment of the utility model, unless otherwise explicitly 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 indicates 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 indicates 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., 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 the present invention. In this specification, the illustrative expressions of the above terms are not limited to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, 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] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A liquid-cooled battery pack, characterized in that, include: The protective component is provided with a receiving cavity; The module is embedded in the receiving cavity; The module includes a positioning shell and battery cells, with several battery cells arranged at intervals within the cavity of the positioning shell. The positioning shell has a first through hole connecting the inside and outside of the shell cavity on both end faces, and several modules are arranged at intervals along the axial direction of the receiving cavity.

2. The liquid-cooled battery pack according to claim 1, characterized in that, The positioning shell is configured as two symmetrically installed covers, one end of which has a cavity, and a first positioning rod for fixing the battery cell is provided in the cavity.

3. The liquid-cooled battery pack according to claim 2, characterized in that, The first through hole is disposed on the other end face of the cover and communicates with the cavity. Multiple first positioning rods are spaced apart along the edge of the first through hole for clamping the battery cell.

4. The liquid-cooled battery pack according to claim 3, characterized in that, The first positioning rod has a step on its side, which is located at the end of the first positioning rod that is connected to the first through hole and faces the first through hole.

5. The liquid-cooled battery pack according to claim 4, characterized in that, The positioning shell is provided with a second positioning rod for separating adjacent modules. The second positioning rod is located on the other end face of the cover and extends from the end face of the cover in a direction away from the cover.

6. The liquid-cooled battery pack according to any one of claims 1 to 5, characterized in that, The protection component includes: The support frame is configured as a cuboid with a groove on one side, the groove having a semi-circular cross-section, and the groove extending from one end of the support frame to the other end of the support frame; The mounting plate is equipped with liquid inlets that run through both sides; The two support frames are spliced ​​together with the groove facing each other and the mounting plates are respectively provided at both ends. The liquid inlet coincides with the central axis of the groove.

7. The liquid-cooled battery pack according to claim 5, characterized in that, It also includes a sealing layer that covers the outer periphery of the module.

8. The liquid-cooled battery pack according to claim 7, characterized in that, It also includes a heat insulation layer, which covers the outer periphery of the sealing layer.

9. The liquid-cooled battery pack according to claim 8, characterized in that, It also includes a sealing gasket, which is sandwiched between the mounting plate and the module.

10. The liquid-cooled battery pack according to claim 9, characterized in that, The module is interference-fitted with the receiving cavity through the sealing gasket and the sealing layer.

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