A power battery liquid cooling device and an electric vehicle

Abstract

The embodiment of the application provides a power battery liquid cooling device and an electric vehicle, and relates to the technical field of batteries. The power battery liquid cooling device comprises an upper cover plate, a cell fixing support, a cell assembly, a liquid cooling plate, a battery package frame, a lower bottom plate and a reinforcing support bottom plate; the upper cover plate, the battery package frame and the lower bottom plate are matched and installed, and the upper cover plate, the battery package frame and the lower bottom plate form an installation space of the cell assembly; the cell assembly comprises a plurality of cells, a plurality of first cell installation grooves are arranged on the cell fixing support, the plurality of first cell installation grooves and the plurality of cells are matched one by one, the first cell installation groove is sleeved on the first part of the cell, and the cell fixing support is abutted in the limiting groove of the battery package frame; the liquid cooling plate is provided with a plurality of second cell installation grooves, and the second cell installation groove is sleeved on the second part of the cell; and the reinforcing support bottom plate is fixedly installed on the lower bottom plate. The power battery liquid cooling device can realize the technical effects of improving the structural strength and the cooling efficiency.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a power battery liquid cooling device and an electric vehicle. Background Technology

[0002] Currently, new energy vehicles refer to automobiles that use unconventional vehicle fuels as their power source (or use conventional vehicle fuels but employ new onboard power devices), integrating advanced technologies in vehicle power control and drive, resulting in vehicles with advanced technical principles and new technologies and structures. One type of new energy vehicle uses a power battery, whose normal operating temperature is -30℃ to 55℃. Excessively high or low temperatures will affect the performance of the power battery. For example, a reduction in battery capacity can easily lead to thermal runaway, or even risks such as fire and explosion. Existing cooling methods for prismatic and pouch cells include air cooling and liquid cooling. Liquid cooling primarily involves placing the liquid cooling plate under the cell, which accounts for 90% of current market models. Another type places the liquid cooling plate on top of the cell, such as BYD's blade battery.

[0003] In current technologies, power battery charging is gradually moving towards high-power charging of 700V, 800V, and even 900V. All supercars, due to their performance requirements, such as 1.9-second acceleration and high-speed track demands, require high-power discharge from their battery cells. However, the cooling mechanisms located at the bottom and top of the battery cells are increasingly unable to meet the needs of future vehicle models, exhibiting poor structural strength and low cooling efficiency. Summary of the Invention

[0004] The purpose of this application is to provide a power battery liquid cooling device and an electric vehicle, which can achieve the technical effects of improving structural strength and cooling efficiency.

[0005] In the first part, the embodiments of this application provide a power battery liquid cooling device, including an upper cover plate, a cell fixing bracket, a cell assembly, a liquid cooling plate, a battery pack frame, a lower base plate, and a reinforcing support base plate;

[0006] The upper cover, the battery pack frame, and the lower base plate are fitted together, and the upper cover, the battery pack frame, and the lower base plate constitute the installation space for the battery cell assembly.

[0007] The battery cell assembly includes multiple battery cells. The battery cell fixing bracket is provided with multiple first battery cell mounting slots. The multiple first battery cell mounting slots are matched with the multiple battery cells one by one. The first battery cell mounting slots are sleeved on the first part of the battery cell. The battery cell fixing bracket abuts against the limiting slot of the battery pack frame.

[0008] The liquid cooling plate is provided with a plurality of second cell mounting slots, and the second cell mounting slots are sleeved on the second part of the cell.

[0009] The reinforced support base plate is fixedly installed on the lower base plate.

[0010] In the above implementation process, the power battery liquid cooling device sets a second cell mounting slot in the liquid cooling plate so that the cells are installed in the second cell mounting slot, thereby ensuring that each cell has a large surface in contact with the liquid cooling plate, which plays a role in temperature control and improves cooling efficiency. The first mounting slot of the cell fixing bracket is fitted onto the first part of the cell, and the cell fixing bracket fills the space between cells and between the cell and the battery pack frame, serving to fix and limit the cells and improve structural strength. Therefore, the power battery liquid cooling device can achieve the technical effects of improving structural strength and cooling efficiency.

[0011] Furthermore, the device also includes a plurality of inter-cell buffer pads, which are matched one-to-one with the plurality of second cell mounting slots;

[0012] In the battery cell assembly, every two battery cells are installed in a second battery cell mounting slot, and a battery cell buffer pad is provided between the two battery cells in a second battery cell mounting slot.

[0013] In the above implementation process, a cell-to-cell buffer pad is placed between every two cells, so that the structure of "cell-cell-to-cell buffer pad-cell" is integrated and placed in the second cell mounting slot of the liquid cooling plate; thus, the cells, the liquid cooling plate, and the cell-to-cell buffer pad form an arrangement of "cell-cell-to-cell buffer pad-cell-liquid cooling plate-cell-to-cell buffer pad-cell-liquid cooling plate".

[0014] Furthermore, the liquid cooling plate is provided with a coolant outlet and a coolant inlet. The coolant enters the liquid cooling plate through the coolant inlet and flows to the coolant outlet through the plate edge channel and the inter-slot channel of the liquid cooling plate.

[0015] Furthermore, the device also includes an upper cover fixing mechanism and a lower bottom fixing mechanism. The upper cover is fixedly installed on the battery pack frame via the upper cover fixing mechanism, and the lower bottom plate is fixedly installed on the battery pack frame via the lower bottom fixing mechanism.

[0016] Furthermore, the device also includes a first thermal insulation foam and a second thermal insulation foam, wherein the first thermal insulation foam is installed between the upper cover plate and the cell assembly, and the second thermal insulation foam is installed between the liquid cooling plate and the battery pack frame.

[0017] In the above implementation process, the first thermal insulation foam is placed between the cell assembly and the top cover to prevent the cell from contacting the top cover, and plays a role in insulating and heat preservation of the cell; the second thermal insulation foam is placed between the cell assembly and the battery pack frame. The function of the second thermal insulation foam is to isolate the heat of the liquid cooling plate from being transferred to the battery pack frame, and prevent the occurrence of temperature runaway.

[0018] Furthermore, the device also includes a first sealing gasket and a second sealing gasket, the first sealing gasket being installed between the upper cover plate and the battery pack frame, and the second sealing gasket being installed between the lower base plate and the battery pack frame.

[0019] In the above implementation process, the first sealing gasket and the second sealing gasket are used to ensure the airtightness requirements of the power battery liquid cooling device.

[0020] Furthermore, the bottom plate is provided with multiple positioning slots, which are matched one by one with the multiple battery cells, and the positioning slots are used to fix the bottom of the battery cells.

[0021] In the above process, the two ends of the battery cell are fixed by the positioning groove of the bottom plate and the battery cell fixing bracket, respectively; thus, the battery cell is precisely fixed by these two fixing methods.

[0022] Furthermore, the positioning groove is provided with structural adhesive, and the battery cell is fixedly bonded to the positioning groove by the structural adhesive.

[0023] In the above process, structural adhesive is applied to the positioning groove of the bottom plate to firmly stick the battery cell to the bottom plate, thereby achieving a fixing effect.

[0024] Furthermore, the reinforcing support base plate is provided with multiple reinforcing ribs, and the included angle between the reinforcing ribs and the positioning groove is between 45° and 135°.

[0025] In the above process, the reinforcing ribs and the positioning grooves are at an angle of 45° to 135°. Within this angle range, the reinforcing support base plate can provide good support for the lower base plate.

[0026] Secondly, embodiments of this application provide an electric vehicle, which includes the power battery liquid cooling device described in any of the first aspects.

[0027] Other features and advantages disclosed in this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology disclosed in this application.

[0028] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is an exploded structural diagram of the power battery liquid cooling device provided in the embodiments of this application;

[0031] Figure 2 This is a schematic diagram of the assembly structure between the battery cell fixing bracket and the battery cell provided in the embodiments of this application;

[0032] Figure 3 This is a schematic diagram of the assembly structure between the cell fixing bracket, the cell, and the battery pack frame provided in an embodiment of this application.

[0033] Figure 4 A schematic diagram of the assembly structure of the battery cell and liquid cooling plate provided in an embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the structure of the liquid cooling plate provided in an embodiment of this application;

[0035] Figure 6 A schematic diagram of the structure between the top cover plate, the first thermal insulation foam, and the battery cell provided in an embodiment of this application;

[0036] Figure 7 This is a schematic diagram of the structure of the lower base plate provided in an embodiment of this application;

[0037] Figure 8 A schematic diagram of the assembly structure of the bottom plate and the battery cell provided in an embodiment of this application;

[0038] Figure 9 This is a structural schematic diagram of the lower base plate and the reinforcing support base plate provided in the embodiments of this application.

[0039] Icons: Top cover plate 100; Top cover fixing mechanism 110; Cell fixing bracket 200; Cell assembly 300; Cell 310; Liquid cooling plate 400; Cell buffer pad 410; Battery pack frame 500; Bottom plate 600; Positioning groove 601; Structural adhesive 602; Bottom fixing mechanism 610; Reinforcing support base plate 700; First heat insulation foam 810; Second heat insulation foam 820; First sealing gasket 910; Second sealing gasket 920. Detailed Implementation

[0040] 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, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0042] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0043] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0044] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0045] This application provides a power battery liquid cooling device and an electric vehicle, which can be applied to the cooling structure of a power battery. The power battery liquid cooling device uses a second cell mounting slot on a liquid cooling plate to house the cells, ensuring each cell has a large surface area in contact with the liquid cooling plate, thus controlling temperature and improving cooling efficiency. A first mounting slot of a cell fixing bracket is fitted onto the first part of the cell, and the fixing bracket fills the space between cells and between the cell and the battery pack frame, serving to fix and limit the cells, improving structural strength. Therefore, this power battery liquid cooling device achieves the technical effects of improved structural strength and cooling efficiency.

[0046] Please see Figure 1 , Figure 1 This is an exploded structural diagram of the power battery liquid cooling device provided in the embodiment of this application. The power battery liquid cooling device includes an upper cover plate 100, a cell fixing bracket 200, a cell assembly 300, a liquid cooling plate 400, a battery pack frame 500, a lower base plate 600, and a reinforcing support base plate 700.

[0047] For example, the upper cover 100, the battery pack frame 500 and the lower base plate 600 are fitted together, and the upper cover 100, the battery pack frame 500 and the lower base plate 600 constitute the installation space of the cell assembly 300.

[0048] For example, the upper cover 100, the battery pack frame 500 and the lower base plate 600 form a sealed mounting space for mounting the cell assembly 300.

[0049] In some implementation scenarios, the top cover 100 can be a steel plate with a design thickness of 0.5mm to 2mm; for example, preferably 0.7mm. The top cover 100 can also be an aluminum plate with a design thickness of 1mm to 5mm; for example, preferably 2mm. The top cover 100 can also be a polymer material with a design thickness of 1.5mm to 5mm; for example, preferably 2.5mm.

[0050] For example, the cell assembly 300 includes a plurality of cells 310, and the cell fixing bracket 200 is provided with a plurality of first cell mounting slots. The plurality of first cell mounting slots are matched one by one with the plurality of cells 310. The first cell mounting slots are sleeved on the first part of the cell 310, and the cell fixing bracket 200 abuts against the limiting slot of the battery pack frame 500.

[0051] For example, the battery cell 310 is sleeved in the first battery cell mounting groove of the battery cell fixing bracket 200, the battery cell 310 abuts against the surface of the first battery cell mounting groove, and the battery cell fixing bracket 200 abuts against the limiting groove of the battery pack frame 500; thus, the battery cell fixing bracket 200 fills the space between the battery cells 310 and between the battery cells 310 and the battery pack frame 500, thereby playing a role in fixing and limiting the battery cell 310.

[0052] In some embodiments, the first part of the battery cell 310 is the upper middle section of the battery cell 310, and the second part of the battery cell 310 is the lower middle section of the battery cell 310.

[0053] For example, the cells 310 in the cell assembly 300 are arranged side by side in parallel.

[0054] For example, the liquid cooling plate 400 is provided with a plurality of second cell mounting slots, which are sleeved on the second part of the cell 310.

[0055] For example, a second cell mounting slot is provided for mounting the cell 310, so that each cell 310 has a large surface in contact with the liquid cooling plate 400, which plays a role in temperature control and improves cooling efficiency.

[0056] For example, the reinforcing support base plate 700 is fixedly installed on the lower base plate 600.

[0057] For example, the structural strength of the entire power battery liquid cooling device is improved by strengthening the support base plate 700 to reinforce the strength of the lower base plate 600.

[0058] For example, such as Figure 1 As shown, there can be multiple cell fixing brackets 200, cell assemblies 300, and liquid cooling plates 400, and each cell fixing bracket 200, cell assembly 300, and liquid cooling plate 400 corresponds to another cell.

[0059] In some embodiments, the power battery liquid cooling device provides a second cell mounting slot on the liquid cooling plate 400, allowing the cells 310 to be installed within the slot. This ensures that each cell 310 has a large surface area in contact with the liquid cooling plate, thus controlling the temperature and improving cooling efficiency. The first mounting slot of the cell fixing bracket 200 is fitted onto the first part of the cell 310, and the cell fixing bracket 200 fills the space between cells 310 and between the cell 310 and the battery pack frame 500, thus fixing and limiting the cells 310 and improving structural strength. Therefore, the power battery liquid cooling device achieves the technical effects of improved structural strength and cooling efficiency.

[0060] Please see Figure 2 and Figure 3 , Figure 2This is a schematic diagram of the assembly structure between the battery cell fixing bracket and the battery cell provided in the embodiments of this application. Figure 3 This is a schematic diagram of the assembly structure between the cell fixing bracket, the cell, and the battery pack frame provided in the embodiments of this application.

[0061] For example, such as Figure 2 As shown, the cell fixing bracket 200 is sleeved on the upper middle section of the cell 310. One cell 310 is placed and installed in each first cell mounting slot of the cell fixing bracket 200, and the function of the cell fixing bracket 200 is to fix the cell 310. Figure 3 As shown, the frame of the cell fixing bracket 200 is specially designed to fill the cell 310 and the battery pack frame 500, so that the cell fixing bracket 200 can play a limiting role in restricting the cell 310 within the entire battery pack frame 500.

[0062] Please see Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the assembly structure of the battery cell and liquid cooling plate provided in an embodiment of this application. Figure 5 This is a schematic diagram of the structure of the liquid cooling plate provided in an embodiment of this application.

[0063] For example, the power battery liquid cooling device also includes a plurality of inter-cell buffer pads 410, which are matched one-to-one with a plurality of second cell mounting slots; in the cell assembly 300, every two cells 310 are installed in a second cell mounting slot, and an inter-cell buffer pad 410 is provided between the two cells 310 in a second cell mounting slot.

[0064] For example, a cell-to-cell buffer pad 410 is placed between every two cells 310, so that the "cell-cell-buffer-cell" structure is integrated and placed in the second cell mounting slot of the liquid cooling plate 400; thus, the cell 310, the liquid cooling plate 400, and the cell-to-cell buffer pad 410 form a "cell-cell-buffer-cell-liquid cooling plate-buffer-cell-liquid cooling plate" arrangement. By setting the above structure, each cell 310 has a large surface in contact with the liquid cooling plate 400 (e.g., ...). Figure 4 As shown, each cell has three sides in contact with the surface of the liquid cooling plate 400, which plays a role in temperature control. Moreover, after charging and discharging, especially during the later stages of the cell's lifespan, the thickness of the cell increases due to electrochemical side reactions, which can compress the entire structure. Therefore, buffer pads need to be added between the cells. This arrangement allows one side of the cell to be temperature-controlled by the liquid cooling plate 400, while the other side contacts the buffer pad 410. The buffer pads absorb the cell expansion, ensuring the reliability of the overall structure.

[0065] For example, the liquid cooling plate 400 is provided with a coolant outlet and a coolant inlet. The coolant enters the liquid cooling plate 400 through the coolant inlet and flows to the coolant outlet through the plate edge channel and the inter-slot channel of the liquid cooling plate.

[0066] For example, the flow direction of the coolant in the liquid cooling plate 400 is shown in [reference needed]. Figure 5 As indicated by the arrow.

[0067] In some embodiments, the edge frame of the liquid cooling plate 400 is a plate edge channel, and the middle frame of the liquid cooling plate 400 is a slot channel.

[0068] For example, the power battery liquid cooling device also includes an upper cover fixing mechanism 110 and a lower bottom fixing mechanism 610. The upper cover plate 100 is fixedly installed on the battery pack frame 500 through the upper cover fixing mechanism 110, and the lower bottom plate 600 is fixedly installed on the battery pack frame 500 through the lower bottom fixing mechanism 610.

[0069] In some implementation scenarios, the top cover fixing mechanism 110 is a top cover locking bolt, which locks the top cover plate 100 to the battery pack frame 500. Optionally, in order to ensure that the airtightness meets the IP67 requirement, the distance between every two top cover locking bolts can be set to about 10cm.

[0070] In some implementation scenarios, the bottom fixing mechanism 610 is a bottom locking bolt, and the bottom plate 600 is fixed to the battery pack frame 500 by the bottom locking bolt.

[0071] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure between the top cover, the first thermal insulation foam, and the battery cell provided in an embodiment of this application.

[0072] For example, the power battery liquid cooling device further includes a first heat-insulating foam 810 and a second heat-insulating foam 820. The first heat-insulating foam 810 is installed between the upper cover plate 100 and the cell assembly 300, and the second heat-insulating foam 820 is installed between the liquid cooling plate 400 and the battery pack frame 500.

[0073] For example, the first thermal insulation foam 810 is disposed between the cell assembly 300 and the upper cover plate 100 to prevent the cell 310 from contacting the upper cover plate 100, and to provide insulation and heat preservation for the cell 310; the second thermal insulation foam 820 is disposed between the cell assembly 300 and the battery pack frame 500. The function of the second thermal insulation foam 820 is to prevent the heat from the liquid cooling plate 400 from being transferred to the battery pack frame 500, thereby preventing temperature runaway.

[0074] In some embodiments, the first thermal insulation foam 810 is made of compressible foam; therefore, when the upper cover 100 presses on the cell 310, the first thermal insulation foam 810 can provide support for the upper cover 2, thereby mitigating the transmission of vibration of the upper cover 100 to the cell 310.

[0075] For example, the power battery liquid cooling device further includes a first sealing gasket 910 and a second sealing gasket 920. The first sealing gasket 910 is installed between the upper cover plate 100 and the battery pack frame 500, and the second sealing gasket 920 is installed between the lower base plate 600 and the battery pack frame 500.

[0076] For example, the first sealing gasket 910 and the second sealing gasket 920 are used to ensure the airtightness requirements of the power battery liquid cooling device.

[0077] In some implementations, the first sealing gasket 910 and the second sealing gasket 920 are used to ensure that the airtightness of the entire battery pack meets the IP67 requirement.

[0078] Please see Figures 7 to 9 , Figure 7 This is a structural schematic diagram of the lower base plate provided in an embodiment of this application. Figure 8 This is a schematic diagram of the assembly structure of the bottom plate and the battery cell provided in an embodiment of this application. Figure 9 This is a structural schematic diagram of the lower base plate and the reinforcing support base plate provided in the embodiments of this application.

[0079] For example, the bottom plate 600 is provided with a plurality of positioning grooves 601, which are matched one by one with a plurality of battery cells 310. The positioning grooves 601 are used to fix the bottom of the battery cells 310.

[0080] For example, the two ends of the battery cell 310 are fixed by the positioning groove 601 of the bottom plate 600 and the battery cell fixing bracket 200, respectively; thus, the battery cell 310 is precisely fixed in these two fixing methods.

[0081] For example, the positioning groove 601 is provided with structural adhesive 602, and the battery cell 310 is fixedly bonded to the positioning groove 601 by the structural adhesive 602.

[0082] For example, by applying structural adhesive 602 into the positioning groove 601 of the lower base plate 600, the battery cell 310 is firmly adhered to the lower base plate 600, thereby achieving a fixing effect.

[0083] In some embodiments, the structural adhesive 602 also has a heat insulation function, preventing the heat of the battery cell 310 from being transferred to the bottom plate 600, thereby avoiding poor temperature control.

[0084] For example, the reinforcing support base plate 700 is provided with a plurality of reinforcing ribs, and the included angle between the reinforcing ribs and the positioning groove 601 is between 45° and 135°.

[0085] For example, the function of the lower base plate 600 is to support the battery cells 310 of the entire battery cell assembly 300. By opening a positioning groove 601 on the lower base plate 600, each battery cell 310 is placed on the positioning groove 601, which works together with the battery cell fixing bracket 200 to limit the position of the battery cell 310.

[0086] In some implementation scenarios, the bottom plate 600 is preferably a sheet metal part, with a recommended range of 0.5mm to 3mm and a preferred thickness of 1mm.

[0087] In some implementation scenarios, the bottom plate 600 can also be made of aluminum profiles, such as extruded aluminum or cast aluminum.

[0088] For example, since the lower base plate 600 is bent when the positioning groove 601 is provided, its rigidity is inevitably insufficient. Therefore, when the battery cell 310 is placed on the lower base plate 600, there is a possibility of unstable assembly. Therefore, a reinforcing support base plate 700 is provided and installed on the lower base plate 600 to improve structural strength. In this embodiment, the reinforcing support base plate 700 is provided with multiple reinforcing ribs, and the reinforcing ribs of the reinforcing support base plate 700 are at an angle of 45° to 135° with the positioning groove 601 of the lower base plate 600. Within this angle range, the reinforcing support base plate 700 can provide good support for the lower base plate 600.

[0089] Exemplary, embodiments of this application provide an electric vehicle, the electric vehicle including as follows Figure 1 Place Figure 9 The power battery liquid cooling device shown.

[0090] By way of example, the power battery liquid cooling device and electric vehicle provided in the embodiments of this application have at least the following advantages:

[0091] (1) The liquid cooling plate 400 contacts the side of the cell 310 and forms an arrangement of "cell-cell buffer pad-cell-liquid cooling plate-cell buffer pad-cell-liquid cooling plate"; thus, each cell 310 has a large surface in contact with the liquid cooling plate 400, which plays a role in temperature control; after charging and discharging, especially in the later stages of life, the thickness of the cell 310 will increase due to electrochemical side reactions. The arrangement of "cell-cell buffer pad-cell-liquid cooling plate-cell buffer pad-cell-liquid cooling plate" allows one side of the cell 310 to be temperature controlled by the liquid cooling plate 400, and the other side to contact the inter-cell buffer pad 410, relying on the inter-cell buffer pad 410 to absorb the expansion of the cell 310.

[0092] (2) The cell fixing bracket 200 is sleeved on the first part of the cell 310 and fills the space between the cells 310 and between the cells 310 and the battery pack frame 500; the bottom plate 600 is provided with a positioning groove 601, and the cell fixing bracket 200 and the positioning groove 601 limit and fix the cells 310 from both ends, so that the cell 310 is more accurately positioned.

[0093] (3) The base plate 700 is reinforced with reinforcing ribs, which are arranged at 45° to 135° with the positioning groove on the lower base plate 600. The stable frame structure of the stroke space ensures that the rigidity and strength of the support for the battery cell 310 meet the requirements.

[0094] In all embodiments of this application, "large" and "small" are relative terms, "more" and "less" are relative terms, and "upper" and "lower" are relative terms. The embodiments of this application will not elaborate further on the expression of such relative terms.

[0095] It should be understood that the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0096] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0097] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

1. A power battery liquid cooling device, characterized in that, This includes the top cover, cell mounting bracket, cell assembly, liquid cooling plate, battery pack frame, bottom plate, and reinforcing support plate; The upper cover, the battery pack frame, and the lower base plate are fitted together, and the upper cover, the battery pack frame, and the lower base plate constitute the installation space for the battery cell assembly. The battery cell assembly includes multiple battery cells. The battery cell fixing bracket is provided with multiple first battery cell mounting slots. The multiple first battery cell mounting slots are matched with the multiple battery cells one by one. The first battery cell mounting slots are sleeved on the first part of the battery cell. The battery cell fixing bracket abuts against the limiting slot of the battery pack frame. The liquid cooling plate is provided with a plurality of second cell mounting slots, and the second cell mounting slots are sleeved on the second part of the cell. The reinforced support base plate is fixedly installed on the lower base plate; The device also includes a plurality of inter-cell buffer pads, which are matched one-to-one with the plurality of second cell mounting slots; In the battery cell assembly, every two battery cells are installed in a second battery cell mounting slot, and a battery cell buffer pad is provided between the two battery cells in a second battery cell mounting slot. The liquid cooling plate is provided with a coolant outlet and a coolant inlet. The coolant enters the liquid cooling plate through the coolant inlet and flows to the coolant outlet through the plate edge channel and the inter-slot channel of the liquid cooling plate.

2. The liquid cooling device for power battery according to claim 1, characterized in that, The device further includes an upper cover fixing mechanism and a lower bottom fixing mechanism. The upper cover plate is fixedly installed on the battery pack frame through the upper cover fixing mechanism, and the lower bottom plate is fixedly installed on the battery pack frame through the lower bottom fixing mechanism.

3. The liquid cooling device for power battery according to claim 1, characterized in that, The device also includes a first thermal insulation foam and a second thermal insulation foam. The first thermal insulation foam is installed between the upper cover plate and the cell assembly, and the second thermal insulation foam is installed between the liquid cooling plate and the battery pack frame.

4. The liquid cooling device for power battery according to claim 1, characterized in that, The device further includes a first sealing gasket and a second sealing gasket, the first sealing gasket being installed between the upper cover plate and the battery pack frame, and the second sealing gasket being installed between the lower base plate and the battery pack frame.

5. The liquid cooling device for power battery according to claim 1, characterized in that, The bottom plate is provided with multiple positioning slots, which are matched one by one with the multiple battery cells. The positioning slots are used to fix the bottom of the battery cells.

6. The liquid cooling device for power battery according to claim 5, characterized in that, The positioning groove is provided with structural adhesive, and the battery cell is fixedly bonded to the positioning groove by the structural adhesive.

7. The liquid cooling device of the power battery according to claim 5, characterized in that, The reinforced support base plate is provided with multiple reinforcing ribs, and the included angle between the reinforcing ribs and the positioning groove is between 45° and 135°.

8. An electric vehicle characterized by comprising: The electric vehicle includes a power battery liquid cooling device as described in any one of claims 1 to 7.

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