A battery box cooling flow channel sealing structure and a battery box

Abstract

This invention relates to the field of power battery housing technology, and in particular to a sealing structure for the cooling channel of a battery housing and a battery housing itself. The structure includes a base plate and a sealing strip. The base plate comprises an upper plate and a lower plate, with wedge grooves formed on the inner sides of both plates. Several obliquely arranged wedges are provided on both sides of the sealing strip, each wedge having a trapezoidal cross-section. The wedges cooperate with the wedge grooves to form a temperature-differential wedge locking structure that adaptively adjusts the preload according to temperature changes. A through-type guide channel is embedded within the sealing strip along its length. One end of the guide channel connects to the inner cavity of the liquid cooling channel, and a limit plug is fitted to the end of the sealing strip. The limit plug integrates a liquid collection chamber, and the other end of the guide channel connects to the liquid collection chamber. This invention utilizes a temperature-differential wedge locking structure to automatically adjust the preload, preventing sealing failure and coolant leakage under hot and cold cycling conditions, thus improving the operational stability and service life of the battery housing cooling system.

Description

Technical Field

[0001] This invention relates to the field of power battery housing technology, and in particular to a sealing structure for cooling channels in a battery housing and a battery housing. Background Technology

[0002] Power batteries are the core power source for new energy vehicles. During operation, batteries generate a significant amount of heat. To ensure the battery operates within a suitable temperature range, cooling channels are typically installed inside the battery casing. A cooling medium is circulated through these channels to dissipate the heat generated by the battery. After the cooling channels are manufactured, their ports must be sealed to prevent leakage of the cooling medium, which could affect cooling efficiency or even pose a safety hazard.

[0003] Common sealing methods include welding, adhesive bonding, and snap-on sealing. Welding typically uses a square aluminum block made of the same material as the battery box. However, welding square aluminum blocks can easily cause local deformation of the box, affecting the assembly accuracy of the battery box. Furthermore, the high temperature during welding may cause thermal damage to the battery components inside the box. Adhesive bonding requires high-performance sealant. Under long-term hot and cold cycling conditions, the sealant is prone to aging and failure, leading to sealing failure and leakage of cooling media. In addition, some sealing structures are inconvenient to install and disassemble, hindering subsequent maintenance and cleaning of the flow channels.

[0004] Some existing patents also use a snap-on sealing structure for battery boxes; it mainly uses ordinary snaps combined with a single-layer rubber sealing ring for sliding assembly. Although it avoids the defects of welding and full-surface gluing, it relies solely on the elasticity of the rubber itself to compensate for temperature deformation. Under high and low temperature environments, the expansion coefficients of the profile and the rubber gasket do not match, and the sealing pre-tightening force varies with temperature. The rubber gasket hardens at low temperatures and has insufficient rebound, while the rubber gasket is compressed and permanently deformed at high temperatures. Long-term use still poses a risk of sealing leakage. There is no leakage collection or overpressure relief structure. Once there is even a slight leakage, the coolant will directly enter the cell compartment. The sealing structure and the box frame assembly are independent of each other. During assembly, separate tooling is required to tighten the sealing parts, resulting in many assembly steps and low production efficiency. Summary of the Invention

[0005] In order to address the technical deficiencies mentioned in the background art, the present invention aims to provide a sealing structure for the cooling channel of a battery box and a battery box, thereby solving the technical problems in the prior art where welding sealing of the battery box easily causes box deformation, affects assembly accuracy and easily causes thermal damage, adhesive sealing is prone to aging and failure under long-term hot and cold cycles, resulting in sealing leakage, and the existing sealing structure is inconvenient to disassemble and maintain.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A sealing structure for cooling channels in a battery casing, comprising: The base plate integrates several liquid cooling channels inside. The base plate includes an upper plate and a lower plate. The inner sides of the upper plate and the lower plate are provided with wedge grooves, and several reinforcing ribs are arranged at equal intervals between the upper plate and the lower plate. The space between two adjacent reinforcing ribs forms the liquid cooling channels. A sealing strip is set at both ends of the liquid cooling channel opening. Several obliquely arranged wedge tongues are set on both sides of the sealing strip. A clearance notch for avoiding the reinforcing rib is opened between two adjacent wedge tongues. The cross section of each wedge tongue is an oblique trapezoidal structure. The wedge tongue and the wedge groove cooperate to form a temperature difference wedge locking structure that can adaptively adjust the preload with temperature changes. The sealing strip has a through-type flow guide groove embedded in its length direction. One end of the flow guide groove is connected to the inner cavity of the liquid cooling channel. The end of the sealing strip is equipped with a limit plug. The limit plug has an integrated liquid collection chamber. The other end of the flow guide groove is connected to the liquid collection chamber for collecting a small amount of leaked coolant.

[0007] Preferably, the wedge tongue and the sealing strip are integrally formed, and the connection is set as an arc transition section; the inclination angle of the wedge tongue matches the inclination angle of the wedge tightening groove. After the wedge tongue is installed in the wedge tightening groove, when a low-temperature cooling medium is introduced into the liquid cooling channel, the shrinkage of the wedge tongue is greater than the shrinkage of the corresponding structure of the base plate, so that the inclined trapezoidal wedge tongue can automatically wedge tight under the action of temperature difference, thereby improving the pre-tightening sealing effect.

[0008] Preferably, the sealing strip has a stepped receiving groove on the contact surface with the base plate, and a sealing element is installed in the stepped receiving groove. The sealing element is independently provided with a pressure-expandable sealing block corresponding to the position of each clearance notch. Each sealing block can expand independently under the pressure of the liquid cooling medium to fill the gap between the clearance notch and the reinforcing rib, further improving the sealing reliability and preventing coolant leakage from the gap.

[0009] Preferably, the sealing element adopts a high-low density double-layer composite structure, with a high-density foamed silicone rubber layer as the bottom layer to provide sufficient structural support, and a low-density flexible foam layer as the surface layer to better fit the gap surface and improve the sealing effect.

[0010] Preferably, the guide groove is an embedded semi-circular arc groove structure, and the guide groove is located in the neutral layer position of the sealing strip to avoid the opening of the guide groove from having too much impact on the overall structural strength of the sealing strip and to ensure the structural stability of the sealing strip.

[0011] Preferably, the limiting plug and the end of the sealing strip are detachable assembly structures. The limiting plug is provided with a visual observation window, which is set corresponding to the liquid collection cavity, so that the amount of liquid in the liquid collection cavity can be observed at any time, which is convenient for timely investigation of potential leakage.

[0012] Preferably, the limiting plug is also provided with a water inlet and a drain inlet that connect to the liquid cooling channel. The water inlet and the drain inlet are fitted with transparent sealing caps to facilitate connection to external liquid supply pipelines and to facilitate observation of the sealing condition of the interface.

[0013] Preferably, an openable and closable external drain nozzle is provided on the outside of the liquid collection chamber. The external drain nozzle is used to quickly drain the leaked coolant accumulated in the chamber, which facilitates regular cleaning of the accumulated liquid and allows maintenance to be completed without disassembling the entire sealing structure.

[0014] The present invention also provides a battery box, including a sealing structure for the cooling channel of the battery box as described in any of the above technical solutions, and a box body formed by splicing two transverse side beams and a longitudinal side beam. The bottom of the transverse side beams and the longitudinal side beams are respectively welded and fixed to the bottom plate, and both the transverse side beams and the longitudinal side beams adopt the same hollow double-layer plate structure as the bottom plate to ensure that the overall structural strength of the box is consistent and to reduce the amount of deformation after welding different structures.

[0015] Furthermore, multiple mounting lugs are equidistantly arranged on one side of the transverse side beam, and corresponding lifting holes are provided on the mounting lugs to facilitate the overall lifting, transportation and installation of the battery box; the longitudinal side beam has a long strip opening along its length for sealing the liquid cooling channel, and the sealing strip is slidably inserted from the end of the longitudinal side beam to seal the long strip opening. The disassembly and assembly process does not require welding, making installation convenient, and the liquid cooling channel can be cleaned and repaired by directly pulling out the sealing strip during maintenance.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses a sealing strip with a slanted trapezoidal wedge tongue to form a temperature difference wedge locking structure in conjunction with the liquid cooling channel. It automatically adjusts the wedge preload by utilizing the temperature difference of the cooling medium during operation, and the sealing installation can be completed without welding, avoiding welding deformation and heat damage. At the same time, compared with traditional adhesive sealing, the sealing reliability is higher, it is not easily affected by cold and heat cycle aging, and the risk of sealing leakage is reduced.

[0017] 2. By setting up a guide channel and a collection chamber, the present invention can collect the small amount of leaked coolant in a centralized manner, preventing the coolant from leaking directly into the tank, thus improving safety performance. Moreover, the leakage situation can be intuitively monitored through the visual observation window, and maintenance and cleaning can be completed without damaging the tank structure, greatly improving maintenance convenience.

[0018] 3. When the sealing structure of this invention is applied to the battery box, the pre-tightening force can be automatically adjusted by the temperature difference wedge locking structure to avoid sealing failure and coolant leakage in the battery box under hot and cold cycling conditions. At the same time, the collected leaked coolant can be centrally treated to prevent the leaked liquid from affecting the normal operation of the battery module, thereby improving the operational stability and service life of the battery box cooling system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall assembly of the battery box of the present invention; Figure 2 This is a top view of the battery box of the present invention; Figure 3 This is a side view of the battery box of the present invention; Figure 4 yes Figure 2 A cross-sectional view of the AA plane; Figure 5 yes Figure 4 Enlarged view of the structure at point a; Figure 6 yes Figure 2 A cross-sectional view of the BB plane; Figure 7 This is an exploded view of the base plate and sealing strip of the present invention; Figure 8 This is a schematic diagram of the structure of the base plate in this invention; Figure 9 yes Figure 8 Enlarged view of the structure at point b in the middle; Figure 10 This is a schematic diagram of the sealing strip in this invention; Figure 11 yes Figure 10 Enlarged view of the structure at point c in the middle; Figure 12 This is a longitudinal sectional view of the sealing strip in this invention.

[0020] Explanation of the reference numerals in the figure: 1. Base plate; 11. Upper plate; 12. Lower plate; 13. Reinforcing rib; 14. Liquid cooling channel; 15. Wedge groove; 2. Sealing strip; 21. Guide channel; 22. Clearance notch; 23. Receiving groove; 3. Wedge tongue; 4. Limiting plug; 41. Liquid collection chamber; 42. External drain nozzle; 5. Sealing element; 51. Sealing block; 6. Water inlet interface; 7. Drain interface; 8. Transparent sealing cover; 9. Box body; 91. Transverse side beam; 92. Longitudinal side beam; 921. Long strip opening; 93. Mounting crossbeam; 94. Intermediate crossbeam; 10. Mounting lug; 101. Lifting hole; 102. Lifting lug connecting plate; 103. Reinforcing block; 104. Threaded mounting hole; 105. Connecting rib. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0022] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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, the above terms should not be construed as limiting this invention.

[0023] In the description of this invention, the use of terms such as "a number" means one or more, with "more than" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while terms like "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the number of indicated technical features, or the sequential relationship between indicated technical features.

[0024] The following is in conjunction with the appendix Figure 1-12 The present invention provides a more detailed description of a sealing structure for a cooling channel in a battery box and an embodiment of the battery box.

[0025] A sealing structure for the cooling channels of a battery casing, such as Figure 7-9 As shown, it includes a base plate 1 and a sealing strip 2. The base plate 1 specifically includes an upper plate 11 and a lower plate 12. Several reinforcing ribs 13 are arranged at equal intervals between the upper plate 11 and the lower plate 12. The space between two adjacent reinforcing ribs 13 directly forms a liquid cooling channel 14.

[0026] In some implementations, such as Figure 10-12 As shown, several obliquely arranged wedge tongues 3 are provided on both sides of the sealing strip 2. The wedge tongues 3 and the sealing strip 2 are integrally formed, and the connection is set as an arc transition section. A clearance notch 22 for avoiding the reinforcing rib 13 is opened between two adjacent wedge tongues 3. The cross section of each wedge tongue 3 is an oblique trapezoidal structure. The inner side of the upper plate 11 and the lower plate 12 is pre-opened with a wedge tightening groove 15 corresponding to the position of the wedge tongue 3. The inclination angle of the wedge tightening groove 15 matches the inclination angle of the wedge tongue 3. After the wedge tongue 3 is inserted into the wedge tightening groove 15, the wedge tongue 3 and the liquid cooling channel 14 cooperate to form a temperature difference wedge tightening locking structure that can adaptively adjust the pre-tightening force according to temperature changes.

[0027] Furthermore, the base plate 1 is made of aluminum alloy, and the wedge tongue 3 is made of engineering plastic with a thermal expansion coefficient greater than that of aluminum alloy. When a low-temperature cooling medium is introduced into the liquid cooling channel 14 to cool the battery module, the overall temperature decreases, and the contraction of the wedge tongue 3 is greater than the contraction of the corresponding structure of the base plate 1. The inclined trapezoidal wedge tongue 3 will automatically wed inward along the wedge groove 15 under the action of temperature difference, automatically increasing the sealing pre-tightening force. When the liquid cooling channel 14 stops flowing and the overall temperature rises, the expansion of the wedge tongue 3 is greater than the expansion of the corresponding structure of the base plate 1. At this time, the inclined trapezoidal structure can avoid excessive increase of pre-tightening force causing structural deformation, and always maintain a suitable pre-tightening sealing force, thereby solving the sealing failure problem caused by the mismatch of the expansion coefficients of aluminum profile and engineering plastic under high and low temperature environments.

[0028] In some implementations, such as Figure 4 , 5 As shown in Figures 11 and 12, a through-type flow guide groove 21 is embedded in the interior of the sealing strip 2 along the length direction. The flow guide groove 21 is an embedded semi-circular arc groove structure and is located in the neutral layer position of the sealing strip 2 to avoid the opening frame affecting the overall structural strength of the sealing strip 2.

[0029] Furthermore, the sealing strip has through holes at the inlet and outlet positions of the liquid cooling channel 14. These through holes are connected to the guide groove 21. One end of the guide groove 21 is connected to the inner cavity of the liquid cooling channel 14 through the through hole. The end of the sealing strip 2 is detachably fitted with a limiting plug 4. The limiting plug 4 has an integrated liquid collection chamber 41 inside. The other end of the guide groove 21 is connected to the liquid collection chamber 41. When a small amount of leakage occurs in the liquid cooling channel 14, the coolant will flow along the guide groove 21 into the liquid collection chamber 41 for centralized collection, preventing the leaked coolant from directly entering the battery cell compartment and causing safety hazards.

[0030] Meanwhile, a visual observation window is provided at the position of the limiting plug 4 corresponding to the liquid collection chamber 41, allowing direct observation of the amount of liquid accumulated in the liquid collection chamber 41 from the outside, and timely detection of potential leakage. In addition, an openable and closable external drain nozzle 42 is also provided on the outside of the liquid collection chamber 41. When it is necessary to clean the accumulated liquid, the external drain nozzle 42 can be opened directly to drain the liquid without disassembling the entire sealing structure, making maintenance very convenient.

[0031] In some implementations, such as Figure 10-12 As shown, a stepped receiving groove 23 is provided on the mating surface of the sealing strip 2 and the base plate 1. A sealing element 5 is installed in the stepped receiving groove 23. Each sealing element 5 is independently provided with a pressure-expandable sealing block 51 corresponding to the position of each clearance notch 22. The sealing element 5 adopts a high-low density double-layer composite structure. The bottom layer is a high-density foamed silicone rubber layer, which provides stable structural support. The surface layer is a low-density flexible foam layer, which can better fit the irregular gap surface.

[0032] Furthermore, when pressurized coolant is introduced into the liquid cooling channel 14, the pressure of the coolant will squeeze the sealing block 51. After being pressed, the sealing block 51 expands on its own and automatically fills the assembly gap between the clearance notch 22 and the reinforcing rib 13, effectively preventing coolant from leaking from this gap and further improving the overall sealing reliability.

[0033] In some implementations, such as Figure 1-5 As shown, the limiting plug 4 is also equipped with an inlet 6 and a drain 7 that connect to the liquid cooling channel 14. Both the inlet 6 and the drain 7 are fitted with transparent sealing caps, which can quickly connect to the external liquid supply pipeline and directly observe the sealing status of the interface, making it convenient to detect leakage problems at the interface in a timely manner.

[0034] This embodiment also provides a battery box, such as Figure 1-6 As shown, the enclosure includes the aforementioned sealing structure, as well as a box body 9 formed by splicing two transverse side beams 91 and two longitudinal side beams 92 together. The bottoms of the transverse side beams 91 and the longitudinal side beams 92 are welded and fixed to the bottom plate 1, and both adopt the same hollow double-layer plate structure as the bottom plate 1 to ensure that the overall structural strength of the box is consistent and to reduce the amount of deformation at different positions after welding.

[0035] Furthermore, the housing body 9 is equipped with two sets of mounting beams 93, which are symmetrically distributed on the base plate 1. A middle beam 94 is provided in the middle between the two sets of mounting beams 93. The two ends of the middle beam 94 are welded and fixed to the transverse side beams 91, and the bottom of the middle beam 94 is fixedly connected to the base plate 1 with structural adhesive. Multiple positioning mounting holes are provided on the end face of the mounting beam 93 facing the battery module. The battery module can be fixedly connected to the mounting beam 93 through the positioning mounting holes without the need for additional connecting brackets, thus simplifying the installation process of the battery module.

[0036] In some implementations, such as Figure 1-3 As shown, multiple mounting lugs 10 are arranged at equal intervals on one side of the transverse side beam 91. Each mounting lug 10 has a lifting hole 101. The lifting hole 101 is gourd-shaped. The gourd-shaped hole can be adapted to different specifications of lifting connectors, which facilitates the overall lifting, transportation and installation of the battery box.

[0037] Furthermore, the lifting lug 10 includes a lifting lug connecting plate and a reinforcing block. The lifting lug connecting plate is designed with an arched structure, and multiple threaded mounting holes 104 arranged in a rectangular array are provided on the lifting lug connecting plate 102. The axis of the threaded mounting holes 104 is perpendicular to the plate surface of the transverse side beam 91. During installation, external bolts are directly engaged with the threaded mounting holes 104 on the lifting lug connecting plate 102, eliminating the need to drill holes in the transverse side beam 91 and avoiding damage to its structural strength. Connecting ribs 105 are integrally formed at the bottom of the lifting lug connecting plate 102. The connecting ribs 105 are spaced along the length of the transverse side beam 91, and their ends are welded to the lifting lug connecting plate 102 and the transverse side beam 91 respectively, further improving the connection stability of the lifting lug connecting plate 102 and preventing cracking of the connection part after the lifting lug connecting plate 102 is subjected to stress. The reinforcing block 103 fills the cavity between the lifting lug connecting plate 102 and the transverse side beam 91. Its shape is adapted to fit the inner side of the lifting lug connecting plate 102, and the inner side of the reinforcing block 103 is also fitted and fixed to the plate surface of the transverse side beam 91. The three form a stable composite stress structure.

[0038] In some implementations, such as Figure 4 As shown, the longitudinal side beam 92 has a long opening along its length, which is used for the sealing strip to slide into from the end of the longitudinal side beam to directly seal the opening of the liquid cooling channel. The entire installation process does not require welding, the assembly process is simple, and the production efficiency is high. During subsequent maintenance, the sealing strip can be directly pulled out to clean and repair the liquid cooling channel, making disassembly and maintenance very convenient.

[0039] The working principle of this invention: During the operation of the battery box, the liquid cooling channel 14 continuously supplies low-temperature cooling medium to dissipate heat from the battery module. At this time, the wedge tongue 3, which forms the sealing structure, shrinks more than the base plate 1 due to its own material shrinkage. The wedge tongue 3 with its inclined trapezoidal cross-section will automatically wedge into the wedge groove 15 under the action of temperature difference, automatically increasing the overall pre-tightening force and ensuring the sealing reliability under low-temperature operating conditions. This avoids the sealing failure problem caused by aging and delamination of traditional adhesive structures due to hot and cold cycles. When there is a slight leakage in the liquid cooling channel 14, the leaked coolant will flow into the guide groove 21 along the assembly gap between the sealing strip 2 and the base plate 1, and then... The coolant is collected centrally by flowing into the collection chamber 41 of the limiting plug 4 through the guide channel 21, preventing the coolant from leaking directly into the battery compartment and affecting the operation of the battery cells. The staff can directly observe the amount of liquid in the collection chamber 41 through the visual observation window to judge the leakage situation. When it is necessary to clean the liquid, simply open the external drain nozzle 42 to complete the drainage. There is no need to disassemble the sealing structure, making maintenance very convenient. When it is necessary to clean and repair the inside of the liquid cooling channel 14, simply pull out the sealing strip 2 from the long open end 921. The disassembly and assembly process does not require damage to the casing structure. After the repair is completed, it can be slid back in, greatly improving the convenience of maintenance.

[0040] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sealing structure for a cooling channel in a battery casing, characterized in that, include: The base plate integrates several liquid cooling channels inside. The base plate includes an upper plate and a lower plate. The inner sides of the upper plate and the lower plate are provided with wedge grooves, and several reinforcing ribs are arranged at equal intervals between the upper plate and the lower plate. The space between two adjacent reinforcing ribs forms the liquid cooling channels. A sealing strip is set at both ends of the liquid cooling channel opening. Several obliquely arranged wedge tongues are set on both sides of the sealing strip. A clearance notch for avoiding the reinforcing rib is opened between two adjacent wedge tongues. The cross section of each wedge tongue is an oblique trapezoidal structure. The wedge tongue and the wedge groove cooperate to form a temperature difference wedge locking structure that can adaptively adjust the preload with temperature changes. The sealing strip has a through-type flow guide groove embedded in its length direction. One end of the flow guide groove is connected to the inner cavity of the liquid cooling channel. The end of the sealing strip is equipped with a limit plug. The limit plug has an integrated liquid collection chamber. The other end of the flow guide groove is connected to the liquid collection chamber for collecting a small amount of leaked coolant.

2. The sealing structure for the cooling channel of the battery box according to claim 1, characterized in that, The wedge tongue and the sealing strip are integrally formed, and the connection is set as an arc transition section; the inclination angle of the wedge tongue matches the inclination angle of the wedge groove.

3. The sealing structure for the cooling channel of the battery housing according to claim 2, characterized in that, The sealing strip has a stepped receiving groove on the contact surface with the base plate. A sealing element is installed in the stepped receiving groove. Each sealing element has an independently pressurized and expandable sealing block at the position of each clearance notch. Each sealing block can expand and fill the gap between the clearance notch and the reinforcing rib under the pressure of the liquid cooling medium.

4. The sealing structure for the cooling channel of the battery housing according to claim 3, characterized in that, The sealing element adopts a high-low density double-layer composite structure, with a high-density foamed silicone rubber layer as the bottom layer and a low-density flexible foam layer as the surface layer.

5. The sealing structure for the cooling channel of the battery box according to claim 1, characterized in that, The guide channel is an embedded semi-circular arc groove structure, and the guide channel is located at the neutral layer position of the sealing strip.

6. The sealing structure for the cooling channel of the battery housing according to claim 1, characterized in that, The limiting plug and the end of the sealing strip are detachable assembly structures. The limiting plug is provided with a visual observation window, which is set in the liquid collection chamber.

7. The sealing structure for the cooling channel of the battery housing according to claim 1, characterized in that, The limiting plug is also provided with a water inlet and a drain inlet that connect to the liquid cooling channel, and the water inlet and drain inlet are fitted with transparent sealing caps.

8. The sealing structure for the cooling channel of the battery box according to claim 1, characterized in that, An external drain nozzle that can be opened and closed is provided on the outside of the liquid collection chamber. The external drain nozzle is used to quickly drain the leaked coolant accumulated in the chamber.

9. A battery box, characterized in that, The battery box includes a sealing structure for the cooling channel as described in any one of claims 1-8, and also includes a box body formed by splicing two transverse side beams and a longitudinal side beam, wherein the bottom of the transverse side beams and the longitudinal side beams are respectively welded and fixed to the bottom plate, and both the transverse side beams and the longitudinal side beams adopt the same hollow double-layer plate structure as the bottom plate.

10. The battery box according to claim 9, characterized in that, Multiple mounting lugs are arranged at equal intervals on one side of the transverse side beam, and the mounting lugs are provided with corresponding lifting holes; the longitudinal side beam is provided with a long strip opening along its length for sealing the liquid cooling flow channel, and the sealing strip is slidably inserted from the end of the longitudinal side beam to seal the long strip opening.

Images