Battery pack lower box body structure and electric vehicle liquid cooling battery

Abstract

The invention discloses a battery pack lower box body structure and an electric vehicle liquid cooling battery, and relates to the technical field of vehicle-mounted batteries, and the battery pack lower box body structure comprises a box body and a sealing plate; an accommodating groove is concavely formed in the box body and is used for accommodating the battery module; the end face, opposite to the containing groove, of the bottom of the box body is a cooling end face, a cooling structure is arranged on the cooling end face, and a cooling medium circulates in the cooling structure and is used for cooling the battery module; the sealing plate is installed at the bottom of the box body opposite to the cooling end face and used for sealing the cooling structure. According to the technical scheme, the box body is concavely provided with the containing groove for containing the battery module, the other end face of the bottom of the containing groove is arranged as the cooling end face, the cooling structure is arranged on the cooling end face, and the cooling medium circulates in the cooling structure and is used for cooling the battery module; according to the arrangement, even if the cooling medium leaks, the cooling medium also leaks on the outer side of the bottom of the accommodating groove, and potential safety hazards caused by contact between the cooling medium and the battery module are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted batteries, and in particular to a lower box structure of a battery pack and a liquid-cooled battery for an electric vehicle. Background Art

[0002] At present, with the promotion of new energy vehicles, the lithium-ion battery industry has developed rapidly. With the increasing demand of users for fast charging of new energy vehicles and long battery cycle life, it is necessary to further improve the temperature uniformity of battery cells; at the same time, due to the demand for long driving range of new energy vehicles, the battery energy density is getting higher and higher, so the requirements for battery thermal management are also getting higher and higher; the battery must meet the adaptability requirements of harsh environments, and at the same time, the demand for suppressing thermal runaway of the battery is also getting higher and higher. It is increasingly important to effectively dissipate heat from lithium-ion batteries. The existing cooling structure mostly adopts a water-cooling structure set at the bottom of the battery pack. The water-cooling structure is in direct contact with the bottom of the battery module and cools the battery module, so that there is a temperature difference between the upper and lower parts of the battery module along its thickness direction. This temperature difference will affect the service life of the battery pack, reduce the usability of the battery pack, and increase the risk of thermal runaway of the battery. There are also the following risks: if the water-cooling liquid in the water-cooling structure leaks, it will directly penetrate into the battery module, thereby causing the risk of short circuit and leakage, and thus causing serious safety hazards in the use of the car. Summary of the invention

[0003] The main purpose of the present invention is to propose a battery pack lower box structure and an electric vehicle liquid-cooled battery, aiming to provide a battery pack lower box structure and an electric vehicle liquid-cooled battery that prevent the water-cooling medium from contacting the battery module.

[0004] To achieve the above-mentioned purpose, the battery pack lower box structure proposed in the present invention includes:

[0005] A box body is provided with a receiving groove for receiving a battery module; an end surface of the bottom of the box body facing away from the receiving groove is provided as a cooling end surface, and a cooling structure is provided on the cooling end surface, and a cooling medium flows through the cooling structure for dissipating heat from the battery module; and

[0006] A sealing plate is installed at the bottom of the box body opposite to the cooling end surface to seal the cooling structure.

[0007] In one embodiment, the cooling structure comprises:

[0008] an inlet and an outlet for cooling medium to enter and exit the cooling structure; and,

[0009] A plurality of flow channels are provided, which are evenly spaced, and both ends are respectively connected to the inlet and the outlet, so that the cooling medium flows in the flow channels.

[0010] In one embodiment, the flow channel is formed by being recessed in the cooling end surface.

[0011] In one embodiment, the connection mode of the plurality of flow channels includes series connection and / or parallel connection.

[0012] In one embodiment, the cooling structure further includes a spoiler disposed at the flow channel to adjust the flow rate of the cooling medium.

[0013] In one embodiment, a plurality of spoilers are provided, and are evenly spaced apart along the extension direction of the flow channel.

[0014] In one embodiment, the cooling structure further includes a plurality of electrically controlled valves, and the plurality of electrically controlled valves are arranged in a one-to-one correspondence with the flow channels.

[0015] In one embodiment, a plurality of reinforcing ribs are protruding from the bottom of the receiving groove and are evenly spaced.

[0016] In one embodiment, a plurality of mounting holes are provided at the bottom of the receiving groove, so that the battery module can be tightly connected to the bottom of the receiving groove by bolts.

[0017] The present invention also provides a liquid-cooled battery for an electric vehicle, wherein the liquid-cooled battery for an electric vehicle comprises a lower box structure of a battery pack as described in any one of the above items.

[0018] The technical solution of the present invention is to provide a box body with a recessed accommodating groove for accommodating the battery module, and the other end face of the bottom of the accommodating groove is set as a cooling end face, on which a cooling structure is arranged, and a cooling medium flows through the cooling structure for dissipating heat from the battery module; at the same time, the sealing plate is arranged and installed on the bottom of the box body relative to the cooling end face to seal the cooling structure; with such an arrangement, even if the cooling medium leaks, it will be on the outside of the bottom of the accommodating groove, and the cooling medium will not contact the battery module to cause a safety hazard. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of an embodiment of a lower box structure of a battery pack provided by the present invention;

[0021] Figure 2 for Figure 1 Bottom view of

[0022] Figure 3 for Figure 2 Internal view with the seal plate removed.

[0023] Description of Figure Numbers:

[0024] 100, battery pack lower box structure; 1, box; 11, receiving groove; 111, reinforcing rib; 112, mounting hole; 12, cooling end surface; 121, cooling structure; 1211, inlet; 1212, outlet; 1213, flow channel; 1214, spoiler; 1215, electric control valve;

[0025] 200. Liquid-cooled battery for electric vehicles.

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] At present, with the promotion of new energy vehicles, the lithium-ion battery industry has developed rapidly. With the increasing demand of users for fast charging of new energy vehicles and long battery cycle life, it is necessary to further improve the temperature uniformity of battery cells; at the same time, due to the demand for long driving range of new energy vehicles, the battery energy density is getting higher and higher, so the requirements for battery thermal management are also getting higher and higher; the battery must meet the adaptability requirements of harsh environments, and at the same time, the demand for suppressing thermal runaway of the battery is also getting higher and higher. It is increasingly important to effectively dissipate heat from lithium-ion batteries. The existing cooling structure mostly adopts a water-cooling structure set at the bottom of the battery pack. The water-cooling structure is in direct contact with the bottom of the battery module and cools the battery module, so that there is a temperature difference between the upper and lower parts of the battery module along its thickness direction. This temperature difference will affect the service life of the battery pack, reduce the usability of the battery pack, and increase the risk of thermal runaway of the battery. There are also the following risks: if the water-cooling liquid in the water-cooling structure leaks, it will directly penetrate into the battery module, thereby causing the risk of short circuit and leakage, and thus causing serious safety hazards in the use of the car.

[0031] In order to solve the above problems, the present invention proposes a battery pack lower box structure and an electric vehicle liquid-cooled battery, aiming to provide a battery pack lower box structure and an electric vehicle liquid-cooled battery that prevent the water-cooling medium from contacting the battery module. Figures 1 to 3 A schematic structural diagram of an embodiment of the lower box structure of a battery pack provided by the present invention.

[0032] Please refer to Figures 1 to 3 In one embodiment of the present invention, the lower box structure 100 of the battery pack includes a box 1 and a sealing plate 2; the box 1 is concavely provided with a receiving groove 11 for receiving a battery module; the end surface of the bottom of the box 1 facing away from the receiving groove 11 is set as a cooling end surface 12, and the cooling end surface 12 is provided with a cooling structure 121, and a cooling medium flows through the cooling structure 121 to dissipate heat from the battery module; the sealing plate 2 is installed at the bottom of the box 1 relative to the cooling end surface 12 to seal the cooling structure 121.

[0033] The technical solution of the present invention is to provide a housing 1 with a recessed receiving groove 11 for receiving the battery module, and the other end face of the bottom of the receiving groove 11 is set as a cooling end face 12, on which a cooling structure 121 is provided, and a cooling medium flows through the cooling structure 121 for dissipating heat from the battery module; at the same time, the sealing plate 2 is installed at the bottom of the housing 1 relative to the cooling end face 12 to seal the cooling structure 121; with such a configuration, even if the cooling medium leaks, it will be on the outside of the bottom of the receiving groove 11, and the cooling medium will not contact the battery module to cause a safety hazard.

[0034] It can be understood that in some embodiments, the liquid-cooled battery pack of the electric vehicle is composed of a battery module, an upper cover, a box body 1, a liquid cooling plate, a bottom guard plate, a high-voltage distribution plate, etc. The box body 1 is welded into a frame shape by aluminum alloy profiles (or sheet metal), and the liquid cooling plate is directly installed at the bottom of the box body 1, the battery module is fixed in the box body 1, the liquid cooling plate is close to the battery module, and the bottom guard plate is installed at the bottom of the box body 1. Therefore, if the liquid cooling plate leaks, the leaked liquid cooling medium will directly contact the battery module, thereby causing safety hazards. For example, the battery pack will short-circuit, leak electricity, and the system will be disordered. In severe cases, fire or explosion may occur, threatening the safety of the user.

[0035] Specifically, the liquid cooling plate is close to the battery module to achieve heat exchange with the battery module. The liquid cooling plate is brazed by two upper and lower aluminum plates. The upper aluminum plate adopts a flat structure and fits the battery cell. The lower aluminum plate is stamped with a channel for the flow of cooling medium. The upper and lower aluminum plates are brazed into a whole. The cooling medium flows in the liquid cooling plate channel to complete the heat exchange between the battery module and the liquid cooling plate. Therefore, once the liquid cooling plate leaks, the cooling medium therein will contact the battery module without any hindrance, causing the short circuit, leakage, system disorder mentioned above, and in severe cases, fire or explosion, which threatens the safety of users.

[0036] In this embodiment, please refer to Figure 1 , the box body 1 and the liquid cooling plate are integrated and die-casted in one piece, that is, the other side of the bottom end face of the accommodating groove 11 of the box body 1 is the cooling end face 12, and the cooling end face 12 is correspondingly provided with the cooling structure 121, wherein a cooling medium flows in the cooling structure 121; and the battery module is directly mounted on the bottom of the accommodating groove 11 of the box body 1, and the bottom end face of the accommodating groove 11 of the box body 1 is both the support of the battery module and, since the back side thereof is the cooling end face 12, the battery module can be cooled; in addition, the cooling end face 12 of the box body 1 A cooling structure 121 is provided, and the cooling structure 121 is of open design. With such a configuration, the processing and forming process of the box body 1 is simplified, making the box body 1 easier to form, thereby reducing the labor intensity of the operator; at the same time, during use, the sealing plate 2 is required to be installed at the bottom of the box body 1 relative to the cooling end face 12 to seal the cooling structure 121; with such a configuration, the liquid cooling medium and the battery module are physically isolated, and even if the liquid cooling medium leaks, it will not enter the accommodating tank 11, thereby protecting the battery pack from the risk of reduced insulation, leakage, and short circuit.

[0037] For further information, please refer to Figure 3The cooling structure 121 includes an inlet 1211, an outlet 1212, and a flow channel 1213: the inlet 1211 and the outlet 1212 are used for cooling medium to enter and exit the cooling structure 121; a plurality of flow channels 1213 are provided, which are evenly spaced, and both ends are respectively connected to the inlet 1211 and the outlet 1212, so that the cooling medium can flow in the flow channel 1213. It can be understood that in some embodiments, the liquid cooling plate is formed by brazing the upper and lower aluminum plates. On the one hand, the aluminum plate cannot be too thick, especially the depth of the channel punched by the lower plate for the circulation of the cooling medium will not be too deep, which limits the cross-sectional area of ​​the channel and the flow resistance of the flow channel 1213 will be large. On the other hand, since the liquid cooling plate is formed by brazing the upper and lower aluminum plates, there are requirements for the sealing width of the channel for the circulation of the cooling medium. Therefore, the channel of the liquid cooling plate for the circulation of the cooling medium cannot be designed too complicated. This will further limit the flow rate of the cooling medium in the channel, thereby greatly reducing the cooling effect of the battery module. At the same time, since the channel of the liquid cooling plate for the circulation of the cooling medium cannot be designed too complicated, the cooling medium cannot flow to some locations that are not easy to cool down. As a result, the battery pack will not be cooled and heat will not be properly cooled, leaving some hidden dangers that are prone to accidents during the use of the battery.

[0038] Therefore, please refer to Figure 3 It can be understood that, in another embodiment, the cooling structure 121 includes the inlet 1211, the outlet 1212, and the flow channel 1213: the inlet 1211 and the outlet 1212 are used for the cooling medium to enter and exit the cooling structure 121; the flow channel 1213 is provided with a plurality of evenly spaced arrangements, and both ends are respectively connected to the inlet 1211 and the outlet 1212, so that the cooling medium flows in the flow channel 1213, thereby, the cooling medium is filled into the flow channel 1213 through the inlet 1211, and the flow channel 1213 is provided with a plurality of evenly spaced arrangements on the cooling end surface 12, thereby ensuring that the battery pack can dissipate heat at every position where the cooling end surface 12 is heated, thereby protecting the normal heat dissipation of the battery pack, and at the same time, such an arrangement further simplifies the arrangement of the box body 1, simplifies the structure, and facilitates production, thereby reducing the processing cost.

[0039] For further information, please refer to Figure 3, the flow channel 1213 is recessed in the cooling end face 12. It can be understood that in some embodiments, the liquid cooling plate and the lower box body 1 of the battery pack are installed by welding or FDS, the battery module is installed on the box body 1, and the battery module and the liquid cooling plate are closely attached by thermal conductive glue between the battery module and the liquid cooling plate; the installation tolerance of the battery module and the liquid cooling plate will affect the efficiency of heat exchange and the temperature uniformity of the module; and because the battery pack has high sealing requirements, long installation process, many installed equipment, and high cost of the battery pack, the flow channel 1213 is recessed in the cooling end face 12. Compared with the traditional flow channel 1213, which is set with a convex plate, the processing method is easier, and the stamping mold can be directly used for rapid molding. The flow channel 1213 set with a transmission convex plate is not easy to process, and due to the processing error, it is easy to cause the height of the convex to be inconsistent, which in turn affects the subsequent sealing process.

[0040] It can be understood that in this embodiment, the other side of the bottom of the accommodating groove 11 of the box body 1 adopts an open structure, with the inlet 1211 for the cooling medium to flow in and the outlet 1212 for the cooling medium to flow out, and the flow channel 1213 is designed at the battery cell facing the battery module. The flow channel 1213 is open and can be achieved by one-time stamping using a stamping die, which is convenient for forming and processing. After the sealing plate 2 is installed, the open flow channel 1213 of the box body 1 and the sealing plate 2 at the bottom form a sealed flow channel 1213. The cooling end face 12 of the box body 1 and the sealing plate 2 at the bottom that form the flow channel 1213 are all open in design, and there are many sealing solutions for the flow channel 1213, and the sealing effect is good.

[0041] For further information, please refer to Figure 3 , the connection mode of the multiple flow channels 1213 includes series connection, and / or parallel connection. It can be understood that the battery module is composed of many battery cells, so the heat dissipation requirement of the battery cell near the middle position of the module is higher than that of the battery cell near the edge position. In addition, the temperature of the cooling medium at the inlet 1211 is lower than that at the outlet 1212. The flow channel 1213 on the box body 1 adopts an open design, and the shape and cross-sectional area of ​​the flow channel 1213 can be adjusted according to the heat dissipation requirements of the battery cell of the battery module. It can also be designed as a plurality of parallel flow channels 1213 or series flow channels 1213. In this embodiment, two flow channels 1213 are connected in parallel.

[0042] For further information, please refer to Figure 3, the cooling structure 121 also includes a spoiler 1214, which is arranged at the flow channel 1213 to adjust the flow rate of the cooling medium. It can be understood that the flow rate of the cooling medium in the flow channel 1213 determines its heat dissipation efficiency for the battery cells of the battery module. In some embodiments, since the cooling medium flows relatively slowly in the flow channel 1213, and since the design of the flow channel 1213 is very consistent with the principle of fluidity, the flow of the cooling medium in the flow channel 1213 of the cooling end face 12 occurs in a laminar flow phenomenon, thus, only the cooling medium close to or close to the cooling end face 12 can absorb and take away the heat generated by the battery cells of the battery module, so that the heat dissipation efficiency required for the battery module cannot be achieved. Therefore, in another embodiment, the cooling structure 121 also includes the spoiler 1214, which is arranged at the flow channel 1213 to adjust the flow rate of the cooling medium.

[0043] Specifically, the spoiler 1214 is designed in the flow channel 1213. The spoiler 1214 has two main functions. On the one hand, the spoiler 1214 can be added at a position with high heat exchange requirements, so as to increase the heat exchange area and heat exchange rate between the cooling end face 12 and the cooling medium, thereby making the temperature of the battery module more uniform. On the other hand, in the parallel flow channels 1213, the flow resistance of the flow channels 1213 can be adjusted by setting the number, shape, height, etc. of the spoilers 1214, so as to balance the flow rate of the cooling medium in the parallel flow channels 1213 and make the temperature of the entire battery module more uniform.

[0044] For further information, please refer to Figure 3, the spoiler 1214 is provided with a plurality of pieces, and is evenly spaced along the extension direction of the flow channel 1213. It can be understood that, as mentioned above, the spoiler 1214 can increase the heat exchange area and heat exchange rate between the cooling end surface 12 and the cooling medium, so that the temperature of the battery module is better, and in the parallel flow channels 1213, the flow resistance of the flow channels 1213 can be adjusted by setting the number, shape, height, etc. of the spoilers 1214, and the flow rate of the cooling medium in the parallel flow channels 1213 can be balanced to make the temperature of the entire battery module better. Therefore, in this embodiment, the spoiler 1214 is provided with a plurality of pieces. , they are evenly spaced along the extension direction of the flow channel 1213, thereby, the spoiler 1214 is convexly arranged at any position of the flow channel 1213, and there is no need to distinguish whether the position corresponding to the cooling end face 12 is the concentration point of the battery cells of the battery module, and the heat exchange area and heat exchange rate between the cooling end face 12 and the cooling medium can be increased for each position of the flow channel 1213 of the cooling end face 12, thereby further improving the heat dissipation capacity of the cooling end face 12 for the battery pack.

[0045] In addition, please refer to Figure 1 and Figure 3 , the cooling structure 121 also includes a plurality of electrically controlled valves 1215, and the plurality of electrically controlled valves 1215 are arranged in a one-to-one correspondence with each of the flow channels 1213. It can be understood that the flow rate and inlet and outlet of the cooling medium also need to be controlled by switches. Thus. The cooling structure 121 also includes a plurality of electrically controlled valves 1215, and the plurality of electrically controlled valves 1215 are arranged in a one-to-one correspondence with each of the flow channels 1213. In this embodiment, since only two flow channels 1213 are provided, only two electrically controlled valves 1215 need to be connected to the two flow channels 1213 respectively. The two electrically controlled valves 1215 are provided on the flow channel 1213 of the box body 1. The working mode of the flow channel 1213 is adjusted by adjusting the electrically controlled valves 1215. In the present embodiment, there are two flow channels 1213 and two electrically controlled valves 1215. The flow channel 1213 in the box body 1 can be designed to be multiple, and the corresponding electrically controlled valves 1215 can also be increased to multiple. Thus, there will be more combinations of working modes of the flow channel 1213, and there will be more ways to adjust the temperature uniformity of the battery module.

[0046] It can be understood that the flow channel 1213 of the box body 1 can also be designed in levels according to the heat dissipation requirements of the battery module, and the area with high heat dissipation requirements is designed in one of the flow channels 1213, and the areas with different heat dissipation requirements are designed in different flow channels 1213. The flow channel 1213 is connected to the electric control valve 1215. The opening of the electric control valve 1215 can be controlled to adjust the working mode of the flow channel 1213, so that the temperature uniformity of the battery module can be better controlled, for example:

[0047] 1. When the temperature uniformity of the battery module is normal, only the flow channel 1213 in the area where heat dissipation is required is opened, so that the heat-prone parts can dissipate heat as quickly as possible, and the thermal management system is energy-saving and efficient;

[0048] 2. When the temperature of the battery module rises rapidly locally, only the corresponding flow channel 1213 may be opened to increase the heat dissipation through the coordination of the flow velocity and the spoiler 1214;

[0049] 3. When temperature differences occur at multiple locations of the battery module, multiple flow channels 1213 need to be opened. The flow channels 1213 can be connected in series, in parallel, or in a combination of series and parallel to make the temperature of the battery module tend to be consistent;

[0050] 4. When the battery module generates a lot of heat during super-fast charging, all the flow channels 1213 operate in parallel and the cooling medium flow rate is at the maximum, the heat exchange efficiency of the cooling medium is adjusted to the maximum, and the battery module is cooled as quickly as possible. After the temperature of the battery module drops to the set value, the flow channels 1213 are changed to series, parallel or series-parallel to adjust the temperature uniformity of the battery module to the best.

[0051] In addition, please refer to Figure 1 , the bottom of the receiving groove 11 is provided with a plurality of reinforcing ribs 111, which are evenly spaced. It is understandable that the inside of the battery module also needs to dissipate heat along its height direction, so the bottom of the receiving groove 11 is provided with a plurality of reinforcing ribs 111, which are evenly spaced, wherein the reinforcing ribs 111 are convexly provided at the bottom of the receiving groove 11, and are connected to the cooling end surface 12 to a certain extent, so that the heat between the battery modules can be transferred to the cooling end surface 12, thereby accelerating the heat dissipation efficiency of the battery module.

[0052] For further information, please refer to Figure 1The bottom of the receiving groove 11 is provided with a plurality of mounting holes 112, so that the battery module is tightly connected to the bottom of the receiving groove 11 by bolts. It can be understood that air is a poor conductor of heat. In order to enhance the heat dissipation capacity of the cooling end surface 12 for the battery module, the bottom of the receiving groove 11 is provided with a plurality of mounting holes 112, so that the battery module is tightly connected to the bottom of the receiving groove 11 by bolts. In this way, the cooling end surface 12 will directly physically cool the battery module without the interference of air, and at the same time, the installation of the battery module and the box body 1 will be further strengthened.

[0053] The present invention also proposes an electric vehicle liquid-cooled battery 200, which includes the battery pack lower box structure 100. The specific structure of the battery pack lower box structure 100 refers to the above embodiment. Since the electric vehicle liquid-cooled battery 200 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0054] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery pack lower box structure, characterized in that: include: A box body is provided with a receiving groove for receiving a battery module; an end surface of the bottom of the box body facing away from the receiving groove is provided as a cooling end surface, and a cooling structure is provided on the cooling end surface, and a cooling medium flows through the cooling structure for dissipating heat from the battery module; and A sealing plate is installed at the bottom of the box body opposite to the cooling end surface to seal the cooling structure.

2. The lower box structure of the battery pack according to claim 1, characterized in that: The cooling structure comprises: an inlet and an outlet for cooling medium to enter and exit the cooling structure; and, A plurality of flow channels are provided, which are evenly spaced, and both ends are respectively connected to the inlet and the outlet, so that the cooling medium flows in the flow channels.

3. The lower box structure of the battery pack as claimed in claim 2, characterized in that: The flow channel is formed by being recessed in the cooling end surface.

4. The lower box structure of the battery pack as claimed in claim 2, characterized in that: The connection mode of the plurality of flow channels includes series connection and / or parallel connection.

5. The lower box structure of the battery pack as claimed in claim 2, characterized in that: The cooling structure further comprises a spoiler, which is arranged at the flow channel and is used to adjust the flow rate of the cooling medium.

6. The lower box structure of the battery pack as claimed in claim 5, characterized in that: The spoilers are provided in plurality and are evenly arranged at intervals along the extending direction of the flow channel.

7. The lower box structure of the battery pack as claimed in claim 2, characterized in that: The cooling structure further includes a plurality of electrically controlled valves, and the plurality of electrically controlled valves are arranged in a one-to-one correspondence with the flow channels.

8. The lower box structure of the battery pack according to claim 1, characterized in that: A plurality of reinforcing ribs are protruding from the bottom of the accommodating groove and are evenly spaced.

9. The lower box structure of the battery pack according to claim 1, characterized in that: The bottom of the accommodating groove is provided with a plurality of mounting holes, so that the battery module can be tightly connected to the bottom of the accommodating groove by bolts.

10. A liquid-cooled battery for an electric vehicle, characterized in that: The electric vehicle liquid-cooled battery includes a battery pack lower box structure as described in any one of claims 1-9.

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