Box cover assembly, box body, battery pack and electric equipment

Abstract

The utility model provides a kind of box cover assembly, box, battery pack and electric equipment, box cover assembly structure includes heat-conducting pedestal and cover, heat-conducting pedestal has the first side and second side of setting away, first side is used to set towards battery cell, first side has recess for the explosion valve of battery cell to exhaust, reduce battery pack security risk.Cover is set in the second side of heat-conducting pedestal, cover and heat-conducting pedestal are suitable for surrounding formation to convey the first flow channel of heat exchange liquid, cover is provided with matching groove, second side has positioning protrusion, and matching groove is installed with positioning protrusion cooperation.So, the matching groove of cover is set with the positioning protrusion of heat-conducting pedestal and installs cooperation, avoid cover and heat-conducting pedestal misplacement, improve subsequent cover and heat-conducting pedestal welding quality.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cover assembly, a housing, a battery pack, and electrical equipment. Background Technology

[0002] The battery pack casing includes a cover assembly. In related technologies, the cover typically consists of a liquid cooling plate and a cover plate, which are welded together to form a liquid cooling channel. However, during welding, the liquid cooling plate and cover plate are prone to shifting or misaligning, which will seriously affect the quality of the cover assembly. Utility Model Content

[0003] The present invention provides a cover assembly, a housing, a battery pack, and electrical equipment, which aims to prevent the liquid cooling plate and the cover from shifting or misaligning during welding, thereby improving the quality of the cover assembly.

[0004] In a first aspect, embodiments of the present invention provide a box cover assembly.

[0005] In one embodiment, the lid assembly includes:

[0006] A heat-conducting base having a first side and a second side disposed opposite to each other, the first side being disposed toward the battery cell, and the first side having a groove for venting the explosion-proof valve of the battery cell.

[0007] A cover portion is provided on the second side of the heat-conducting base, and the cover portion and the heat-conducting base are adapted to enclose and form a first flow channel for conveying heat exchange fluid;

[0008] The cover portion is provided with a mating groove, and the second side has a positioning protrusion, wherein the mating groove and the positioning protrusion are fitted together.

[0009] In one embodiment, the first side is partially recessed to correspond to a partial protrusion on the second side, such that the first side forms the groove and the second side forms the positioning protrusion.

[0010] In this embodiment of the invention, a stamping process is used to achieve a localized depression on the first side and a corresponding localized protrusion on the second side. Compared to other processing methods, such as machining, stamping eliminates the need for material removal piece by piece; instead, it directly forms the heat-conducting base through rapid extrusion by a die, significantly shortening processing time and improving production efficiency. During the stamping process, the material undergoes plastic deformation under the action of the die, resulting in work hardening at the depression on the first side and the protrusion on the second side of the heat-conducting base. This work hardening increases the strength and hardness of the material, enhancing the overall structural strength of the heat-conducting base, enabling it to better withstand external loads and vibrations, and extending the service life of the cover assembly.

[0011] In one embodiment, the inner wall of the first flow channel is at least partially irregular.

[0012] In this embodiment of the invention, a turbulence structure is formed on the inner wall of the first flow channel. This turbulence structure breaks the laminar flow state of the coolant within the first flow channel, creating more complex flow paths and vortices. This facilitates thorough mixing of coolants at different temperatures, preventing excessively high or low local temperatures in the coolant within the first flow channel, resulting in a more uniform temperature distribution throughout the entire capping section and thus improving heat dissipation efficiency. The turbulence structure increases the turbulence of the coolant within the first flow channel, thereby enhancing the contact and collision between the coolant and the inner wall of the first flow channel, as well as the heat source. This accelerates the transfer of heat from the heat source to the coolant, thereby improving heat exchange efficiency and more effectively removing heat generated by the equipment. The turbulence structure also reduces the thickness of the thermal boundary layer between the coolant and the inner wall of the first flow channel. Since the thermal boundary layer is one of the main obstacles to heat transfer, a thinner thermal boundary layer reduces thermal resistance, making it easier for heat to transfer from the liquid cooling plate to the coolant, further improving heat dissipation performance.

[0013] In one embodiment, the portion of the cover facing away from the heat-conducting base is recessed toward the heat-conducting base to form a corresponding boss on the side of the cover facing the heat-conducting base.

[0014] In this embodiment of the invention, the cover portion is recessed towards the heat-conducting base by stamping, forming a corresponding boss on the side of the cover portion facing the heat-conducting base. Compared to other processing methods, such as cutting, stamping eliminates the need for material removal; instead, it directly forms the cover portion through rapid extrusion by a die, significantly shortening processing time and improving production efficiency. During the stamping process, the material undergoes plastic deformation under the action of the die, resulting in work hardening in the recessed and corresponding boss areas of the cover portion. This work hardening increases the strength and hardness of the material, enhancing the overall structural strength of the cover portion, enabling it to better withstand external loads and vibrations, and extending the service life of the cover assembly.

[0015] In one embodiment, the heat-conducting base and the cover are fixed by brazing.

[0016] In this embodiment of the invention, brazing fills the gap between the heat-conducting base and the cover by melting the brazing filler metal, forming a metallurgical bond with high strength. This bond can withstand significant pressure and vibration, ensuring that the first flow channel will not loosen or leak during long-term use. When the battery pack is frequently charged and discharged or subjected to external vibrations, the brazed connection maintains stable performance, reducing the risk of failure due to connection failure. The dense weld seam effectively prevents heat exchange fluid from leaking from the first flow channel, avoiding performance degradation or safety hazards caused by leakage. Brazing materials typically have good corrosion resistance, resisting the erosion of chemicals that may be present in the heat exchange fluid, extending the service life of the first flow channel. The extremely low thermal resistance of the brazed connection ensures rapid heat transfer between the heat-conducting base and the cover, improving the heat exchange efficiency between the first flow channel and the battery cell. The uniform weld seam ensures even heat distribution within the flow channel, preventing localized overheating or undercooling and improving the temperature consistency of the battery pack. Brazing eliminates the need for additional fasteners (such as bolts and nuts), reducing the number of components, simplifying the structure, and making the battery pack more compact. This compact design helps optimize internal space utilization and improve energy density.

[0017] In one embodiment, the mating groove is provided through the cover portion along the direction from the first side to the second side.

[0018] In the embodiments of this utility model, the through-hole design of the mating groove provides a clear positioning reference for the installation of the cover. During installation, the operator can quickly and accurately install the cover and the heat-conducting base into the designated position by inserting the positioning protrusion of the heat-conducting base into the mating groove, thus improving the assembly efficiency of the heat-conducting base and the cover. Furthermore, the through-hole design allows the solder to be discharged promptly during the flow process, avoiding local accumulation within the groove. This helps reduce the problem of excessive solder residue after welding and reduces the unevenness of the weld joint thickness. Uniform solder coating reduces stress concentration in the weld joint, improving its strength and reliability. Simultaneously, uniform solder distribution also helps reduce defects such as porosity and cracks during the welding process.

[0019] In one embodiment, it further includes a heat insulation portion, which is disposed on the side of the cover portion away from the heat-conducting base and connected to the cover portion.

[0020] In the embodiments of this utility model, the insulation section has excellent heat insulation performance, which can reduce heat loss from the first flow channel plate and maintain a stable temperature. The insulation section can buffer external impacts and vibrations, preventing direct mechanical damage to the cover section and extending the service life of the cover plate assembly. The good insulation performance of the insulation section can reduce the energy required for heating or cooling the cover section, lowering operating costs. Furthermore, the insulation section can prevent moisture from entering the cover section, avoiding problems such as rust and corrosion. Since the design of the first flow channel of the cover section cannot be observed visually after the insulation section is in place, it protects the product's appearance and structure to a certain extent.

[0021] In one embodiment, the insulation part includes insulation cotton or foam.

[0022] In one embodiment, an insulating portion is further included, which is disposed on the first side to provide electrical isolation between the heat-conducting base and the battery cell.

[0023] In embodiments of this invention, if there is an electrical connection between the battery cell and the heat-conducting base, short circuits may occur due to insulation failure, leading to serious safety accidents such as overheating, fire, or even explosion. The insulating part, located on the first side, electrically isolates the heat-conducting base from the battery cell, effectively blocking abnormal current conduction paths, avoiding short circuit risks, and ensuring the electrical safety of the battery pack. During operation, the battery cell generates an electromagnetic field. If there is insufficient insulation between it and the heat-conducting base, electromagnetic interference may be conducted to other components through the heat-conducting base, affecting the electrical performance of the entire system. The insulating part can block the propagation of electromagnetic interference, ensuring the normal operation of all electronic components within the system and improving the system's stability and reliability. If there is an electrical connection between the battery cell and the heat-conducting base, electrochemical corrosion may occur in humid environments, leading to increased contact resistance and aggravated heating. The insulating part can effectively isolate the battery cell from the heat-conducting base, preventing electrochemical corrosion and extending the battery pack's lifespan.

[0024] In one embodiment, the insulating part is provided with a clearance hole, which is correspondingly provided and connected to the groove, and the clearance hole is used to avoid the explosion-proof valve.

[0025] In this embodiment of the present invention, the high-temperature gas after the battery cell is depressurized is prevented from causing the insulation part to melt. After the insulation part melts, the melted liquid drips onto the battery cell pressure relief valve, causing the pressure relief valve to be covered and blocked, thus affecting the battery cell's venting and pressure relief.

[0026] In one embodiment, the insulating portion includes at least one of a PC board, a PET board, a mica board, and an epoxy resin board.

[0027] In one embodiment, the material of the heat-conducting base includes at least one selected from aluminum and aluminum alloys; and / or,

[0028] The material of the cover includes at least one of aluminum and aluminum alloys.

[0029] In the embodiments of this invention, aluminum and aluminum alloys possess excellent thermal conductivity, enabling them to rapidly conduct heat generated by the battery cell to the cover, improving heat dissipation efficiency and thus reducing the operating temperature of the battery cell. Aluminum and aluminum alloys have relatively low density, and using these materials as a thermal conductive base can significantly reduce the overall weight of the cover assembly. Aluminum and aluminum alloys possess a certain degree of strength and rigidity, preventing damage to the thermal conductive base due to deformation or breakage. Aluminum and aluminum alloys can form a dense oxide film in air, preventing further oxidation reactions; this anti-oxidation property helps maintain the long-term stability of the thermal conductive base. Compared to some other high-performance thermal conductive materials, aluminum and aluminum alloys are relatively inexpensive. This helps reduce the manufacturing cost of the battery pack and improve the product's cost-effectiveness.

[0030] In the embodiments of this invention, aluminum and aluminum alloys possess extremely high thermal conductivity, enabling rapid transfer of heat generated by the battery cell to the heat exchange fluid, significantly improving heat dissipation efficiency. Aluminum and aluminum alloys have low density, significantly reducing the weight of the cover compared to traditional heat dissipation materials such as copper. A dense oxide film easily forms on the surface of aluminum and aluminum alloys, providing excellent corrosion resistance. In liquid cooling systems, this property helps prevent corrosion of the cover by the cooling medium, extending its service life. Compared to precious metals such as copper, aluminum and aluminum alloys are less expensive, helping to reduce the manufacturing cost of the cover. Due to the excellent corrosion resistance and mechanical properties of aluminum and aluminum alloys, the maintenance cost of the cover is low during long-term use, reducing the frequency of replacement and repair.

[0031] Secondly, this application also provides a housing, comprising:

[0032] The main body of the box has an open receiving cavity for accommodating the battery module;

[0033] As described above, the lid assembly covers the opening and is connected to the box body.

[0034] Thirdly, this application also provides a battery pack, comprising:

[0035] The enclosure as described above;

[0036] The battery module is installed in the receiving cavity, and the battery module is thermally connected to the cover assembly.

[0037] Fourthly, this application also provides an electrical device, including the battery pack as described above.

[0038] The beneficial effects of the embodiments of this utility model are as follows:

[0039] In this embodiment of the invention, a groove is provided on the first side of the heat-conducting base for venting the explosion-proof valve of the battery cell. When the cover assembly abuts against the battery module, the periphery of the groove is sealed against the battery module, creating a closed pressure relief channel between the inner wall of the groove and the end face of the battery module. When the internal pressure of the battery cell is too high and the explosion-proof valve opens, the high-temperature discharge material is discharged through the closed pressure relief channel, preventing pressure buildup inside the battery cell and reducing the risk of cell rupture or explosion. Furthermore, because the periphery of the groove is sealed against the end face of the battery module, high-temperature discharge material will not leak from the sealed contact point, thus preventing it from spreading to adjacent battery cells or electrical units, reducing battery pack safety hazards and the risk of chain reactions. This pressure relief channel design enables thermoelectric separation, allowing the thermal runaway pressure relief area to be independent of the power transmission area, significantly reducing the probability of internal high-voltage arcing and sparking failure during thermal runaway. Furthermore, the mating groove of the cover portion mates with the positioning protrusion of the heat-conducting base. This mating method not only ensures the accurate relative position between the cover portion and the heat-conducting base, but also enhances the connection stability between the two, preventing misalignment of the cover portion and the heat-conducting base due to vibration, impact, or other factors, and improving the subsequent welding quality of the cover portion and the heat-conducting base. The cover portion and the heat-conducting base are adapted to form a first flow channel a for conveying the heat exchange fluid. This design allows the heat exchange fluid to directly contact the heat-conducting base, transferring heat to the battery cell or absorbing heat from the battery cell through the heat-conducting base, achieving efficient heat exchange. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of a battery pack (partial structure) provided in an embodiment of this utility model;

[0042] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the battery pack (partial structure) shown;

[0043] Figure 3 yes Figure 2 A magnified view of part A shown below;

[0044] Figure 4 yes Figure 2 A magnified view of part B shown below;

[0045] Figure 5This is a structural schematic diagram of the box cover assembly provided in an embodiment of this utility model;

[0046] Figure 6 yes Figure 5 A schematic diagram of the structure of the heat-conducting base from one perspective;

[0047] Figure 7 yes Figure 5 A schematic diagram of the thermally conductive base from another perspective;

[0048] Figure 8 yes Figure 5 A schematic diagram of the structure of the cover shown from one perspective;

[0049] Figure 9 yes Figure 5 A schematic diagram of the structure of the cover from another perspective.

[0050] Explanation of reference numerals in the attached figures:

[0051] 200. Battery module; 10. Case cover assembly; 1. Heat-conducting base; 11. First side; 111. Groove; 12. Second side; 121. Positioning protrusion; 2. Cover part; 22. Mating groove; 23. Boss; 3. Insulation part; 4. Insulation part; 41. Clearance hole; 51. Liquid inlet; 52. Liquid outlet; 53. Liquid inlet hose; 54. Liquid outlet hose; a. First flow channel; a1. Liquid inlet flow channel; a2. Liquid outlet flow channel; 20. Battery cell; 201. Explosion-proof valve. Detailed Implementation

[0052] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0053] Reference Figure 1 and Figure 2The present invention provides an electrical device comprising a battery pack, the battery pack comprising a housing and a battery module 200, the housing comprising a housing body and a housing cover assembly 10, the housing body forming an accommodating cavity with an opening, the battery module 200 being installed in the accommodating cavity, the housing cover assembly 10 covering the opening and connected to the housing body, and the battery module 200 being thermally connected to the housing cover assembly 10.

[0054] It should be noted that the electrical equipment can be vehicles, energy storage power supplies, consumer electronics, medical equipment, or smart cities, etc. Specifically, this application does not limit this.

[0055] Reference Figures 3 to 5 The cover assembly 10 includes a heat-conducting base 1 and a cover portion 2. The heat-conducting base 1 has a first side 11 and a second side 12 disposed opposite to each other. The first side 11 is disposed toward the battery cell 20 and has a groove 111 for venting the explosion-proof valve 201 of the battery cell 20. The cover portion 2 is disposed on the second side 12 of the heat-conducting base 1. The cover portion 2 and the heat-conducting base 1 are adapted to form a first flow channel a for conveying heat exchange fluid. The cover portion 2 is provided with a mating groove 22, and the second side 12 has a positioning protrusion 121. The mating groove 22 is fitted with the positioning protrusion 121.

[0056] In an embodiment of this utility model, the first side 11 of the heat-conducting base 1 is provided with a groove 111 for venting the explosion-proof valve 201 of the battery cell 20. When the cover assembly 10 abuts against the battery module 200, that is, the periphery of the groove 111 is sealed against the battery module 200, so that the inner wall of the groove 111 and the end face of the battery module 200 form a closed pressure relief channel. When the internal pressure of the battery cell 20 is too high, when the explosion-proof valve 201 is opened, the high-temperature discharge material is discharged through the closed pressure relief channel, avoiding the accumulation of pressure inside the battery cell 20, thereby reducing the risk of the battery cell 20 rupture or explosion. Furthermore, since the periphery of the groove 111 is sealed against the end face of the battery module 200, high-temperature discharge will not leak from the sealed contact point between the periphery of the groove 111 and the end face of the battery module 200. This prevents the high-temperature discharge from spreading to the adjacent cells 20 or electrical units, reducing battery pack safety hazards and the risk of chain reactions. This pressure relief channel design enables thermoelectric separation, allowing the thermal runaway pressure relief area to be independent of the power transmission area, significantly reducing the probability of internal high-voltage arcing and sparking failure during thermal runaway. In addition, the mating groove 22 of the cover 2 is fitted with the positioning protrusion 121 of the heat-conducting base 1. This fitting method not only ensures the accurate relative position between the cover 2 and the heat-conducting base 1, but also enhances the connection stability between the two, preventing misalignment of the cover 2 and the heat-conducting base 1 due to vibration, impact, or other factors, and improving the subsequent welding quality of the cover and the heat-conducting base. The cover 2 and the heat-conducting base 1 are adapted to form a first flow channel a for conveying heat exchange fluid. This design allows the heat exchange fluid to directly contact the heat-conducting base 1, and to transfer heat to the battery cell 20 or absorb heat from the battery cell 20 through the heat-conducting base 1, thus achieving efficient heat exchange.

[0057] It should be noted that in the above embodiments, the peripheral sidewalls of the groove 111 include two first sidewalls arranged opposite each other along the length of the groove 111 and two second sidewalls arranged opposite each other along the width of the groove. Furthermore, in related technologies, the main body of the box is provided with an air duct connected to the pressure relief channel. One end of the air duct is connected to the pressure relief channel, and the other end is connected to the outside atmosphere, thereby enabling the smooth discharge of high-temperature ejected waste. Since the specific structure of the air duct is technically mature, it will not be described in detail here.

[0058] The shape of the groove 111 can be selected as needed. For example, refer to... Figure 1In one embodiment, the groove 111 extends along a first direction and corresponds to the explosion-proof valves 201 of a plurality of battery cells 20 arranged along the first direction. The explosion-proof valves 201 of the plurality of battery cells 20 vent through the groove 111. Thus, since a sealed pressure relief channel is formed between the inner wall of the groove 111 and the end face of the battery module 200, when the internal pressure of the plurality of battery cells 20 is too high and the plurality of explosion-proof valves 201 open, the high-temperature discharge material is discharged through the sealed pressure relief channel. Furthermore, since the periphery of the groove 111 is sealed against the end face of the battery module 200, that is, the two second sidewalls of the groove 111 are sealed against the battery module 200, the high-temperature discharge material will not leak from the sealed contact points between the two second sidewalls of the groove 111 and the battery module 200. This prevents the high-temperature discharge material from spreading to the battery cells 20 or electrical units adjacent to the second sidewalls of the groove 111, reducing battery pack safety hazards and the risk of chain reactions.

[0059] In another embodiment, multiple grooves 111 are provided, and each groove 111 corresponds one-to-one with an explosion-proof valve 201 of a plurality of battery cells 20 arranged along the first direction. The explosion-proof valve 201 of each battery cell 20 vents gas through the corresponding groove 111. Thus, since the inner wall of each groove 111 forms a sealed pressure relief channel with the end face of the battery module 200, when the internal pressure of the plurality of battery cells 20 is too high and the plurality of explosion-proof valves 201 open, the high-temperature effluent is discharged through the plurality of sealed pressure relief channels. In addition, since the periphery of the groove 111 is sealed and abuts against the end face of the battery module 200, that is, the two second sidewalls and the two first sidewalls of the groove 111 are sealed and abut against the end face of the battery module 200, the high-temperature discharge will not leak out from the two second sidewalls and the two first sidewalls of the groove 111 where they are sealed and abut against the battery module. This not only prevents the high-temperature discharge from spreading to the battery cell 20 or electrical unit adjacent to the two first sidewalls of the groove 111, but also prevents the high-temperature discharge from spreading to the battery cell 20 or electrical unit adjacent to the two second sidewalls of the groove 111, greatly reducing the safety hazards of the battery pack and the risk of chain reaction.

[0060] Reference Figure 1The groove 111 is located directly above the explosion-proof valve, and the first flow channel a is positioned at the top of the terminal post of the battery cell 20 and is thermally connected to the top of the terminal post. Thus, the groove 111, positioned directly above the explosion-proof valve 201, provides a direct and precise channel for the valve to vent gas. When an abnormal situation occurs in the battery cell 20 (such as overheating or overcharging), causing the explosion-proof valve 201 to open, gas can be quickly and directionally discharged through the groove 111, preventing gas accumulation inside the battery pack, effectively reducing the risk of explosion or fire, and improving overall safety. The first flow channel a is positioned at the top of the terminal post of the battery cell 20 and is thermally connected to the top of the terminal post, enabling direct heat dissipation from the core heat-generating area of ​​the battery cell 20. As a key component for current transmission in the battery cell 20, the terminal post generates a significant amount of heat during operation. The heat exchange fluid transported through the first flow channel a can quickly remove this heat, reducing the terminal post temperature and preventing performance degradation or safety hazards caused by overheating.

[0061] Reference Figure 6 and Figure 7 In one embodiment, the first side 11 is partially recessed to correspond to a partial protrusion on the second side 12, forming a groove 111 on the first side 11 and a positioning protrusion 121 on the second side 12. This achieves a partial recess on the first side 11 and a corresponding protrusion on the second side 12 through stamping. Compared to other processing methods, such as machining, stamping eliminates the need for material removal piece by piece, instead directly forming the material through rapid extrusion by a die, significantly shortening processing time and improving the production efficiency of the heat-conducting base 1. During the stamping process, the material undergoes plastic deformation under the action of the die, resulting in work hardening of the heat-conducting base 1 at the recessed portion of the first side 11 and the protruding portion of the second side 12. This work hardening increases the strength and hardness of the material, enhancing the overall structural strength of the heat-conducting base 1, enabling it to better withstand external loads and vibrations, and extending the service life of the cover assembly 10.

[0062] Reference Figure 3In one embodiment, the inner wall of the first flow channel a is at least partially irregularly shaped, thus forming a turbulence structure. This turbulence structure breaks the laminar flow of the coolant within the first flow channel a, creating more complex flow paths and vortices. This facilitates thorough mixing of coolants at different temperatures, preventing excessively high or low local temperatures within the first flow channel a, resulting in a more uniform temperature distribution across the entire cover portion 2, thereby improving heat dissipation efficiency. The turbulence structure increases the turbulence of the coolant within the first flow channel a, enhancing contact and collision between the coolant and the inner wall of the first flow channel a, as well as the heat source. This accelerates the transfer of heat from the heat source to the coolant, thereby improving heat exchange efficiency and more effectively removing heat generated by the equipment. The turbulence structure also reduces the thickness of the thermal boundary layer between the coolant and the inner wall of the first flow channel a. Since the thermal boundary layer is one of the main obstacles to heat transfer, a thinner thermal boundary layer reduces thermal resistance, making it easier for heat to transfer from the liquid cooling plate to the coolant, further improving heat dissipation performance.

[0063] Reference Figure 3 , Figure 8 as well as Figure 9 In one embodiment, the portion of the cover 2 facing away from the heat-conducting base 1 is recessed towards the heat-conducting base 1, forming a corresponding boss 23 on the side of the cover 2 facing the heat-conducting base 1. Thus, by using a stamping process, the portion of the cover 2 facing away from the heat-conducting base 1 is recessed towards the heat-conducting base 1, forming a corresponding boss 23 on the side of the cover 2 facing the heat-conducting base 1. Compared to other processing methods, such as machining, stamping eliminates the need for material removal piece by piece; instead, it directly forms the cover through rapid extrusion by a die, significantly shortening processing time and improving the production efficiency of the cover 2. During the stamping process, the material undergoes plastic deformation under the action of the die, resulting in work hardening in the recessed areas and the areas where the corresponding boss 23 is formed. This work hardening increases the strength and hardness of the material, enhancing the overall structural strength of the cover 2, enabling it to better withstand external loads and vibrations, and extending the service life of the cover assembly 10.

[0064] It should be noted that the boss 23 is thermally connected to the heat-conducting base 1, which allows heat to be transferred more evenly from the cover 2 to the heat-conducting base 1. On the heat-conducting base 1, heat can diffuse more quickly, avoiding local overheating or undercooling, improving the uniformity of temperature distribution within the battery module 200, which helps to improve the performance and consistency of the battery pack and extend its service life.

[0065] In one embodiment, the heat-conducting base 1 and the cover 2 are fixed by brazing. In this way, the brazing fills the gap between the heat-conducting base 1 and the cover 2 with molten filler metal, forming a metallurgical bond with high strength, capable of withstanding significant pressure and vibration, ensuring that the first flow channel a will not loosen or leak during long-term use. When the battery pack is frequently charged and discharged or subjected to external vibrations, the brazed connection maintains stable performance, reducing the risk of failure due to connection failure. The dense weld seam formed by brazing effectively prevents the heat exchange fluid from leaking from the first flow channel a, avoiding performance degradation or safety hazards caused by leakage. The brazing material typically has good corrosion resistance, resisting the erosion of chemicals that may be present in the heat exchange fluid, extending the service life of the first flow channel a. The extremely low thermal resistance of the brazed connection ensures rapid heat transfer between the heat-conducting base 1 and the cover 2, improving the heat exchange efficiency between the first flow channel a and the battery cell. The uniform weld seam formed by brazing ensures even heat distribution within the flow channel, avoiding localized overheating or undercooling, and improving the temperature consistency of the battery pack. Brazing eliminates the need for additional fasteners (such as bolts and nuts), reducing the number of components, simplifying the structure, and making the battery pack more compact. This compact design helps optimize internal space utilization and improve energy density.

[0066] It should be noted that, in other embodiments, the method of fixing the heat-conducting base 1 and the cover 2 can be selected as needed. For example, in some embodiments, the heat-conducting base 1 and the cover 2 can also be fixedly connected by screws or by adhesive. Specifically, this application does not limit this.

[0067] Reference Figure 4 , Figure 8 as well as Figure 9 In one embodiment, the mating groove 22 extends through the cover portion 2 along the direction from the first side 11 to the second side 12. This through-hole design of the mating groove 22 provides a clear positioning reference for the installation of the cover portion 2. During installation, the operator can quickly and accurately install the cover portion 2 and the heat-conducting base 1 into the designated position by inserting the positioning protrusion 121 of the heat-conducting base 1 into the mating groove 22, improving the assembly efficiency of the heat-conducting base 1 and the cover portion 2. Furthermore, the through-hole design of the mating groove 22 allows the solder to be discharged promptly during the flow process, avoiding local accumulation within the groove. This helps reduce the problem of excessive solder residue after welding and reduces the thickness unevenness of the weld joint. Uniform solder coating reduces stress concentration in the weld joint, improving its strength and reliability. Simultaneously, uniform solder distribution also helps reduce defects such as porosity and cracks during the welding process.

[0068] Reference Figures 3 to 5In one embodiment, the lid assembly 10 further includes a heat insulation section 3, which is located on the side of the lid 2 away from the heat-conducting base 1 and connected to the lid 2. Thus, the heat insulation section 3 has excellent heat insulation performance, reducing heat loss from the first flow channel a plate and maintaining a stable temperature. The heat insulation section 3 can buffer external impacts and vibrations, preventing direct mechanical damage to the lid 2 and extending the service life of the lid assembly. The good heat insulation performance of the heat insulation section 3 reduces the energy required for heating or cooling the lid 2, lowering operating costs. Furthermore, the heat insulation section 3 prevents moisture from entering the lid 2, avoiding problems such as rust and corrosion. Since the design of the first flow channel a of the lid 2 is not visible after the heat insulation section 3 is applied, it protects the product's appearance to a certain extent.

[0069] It should be noted that the insulation part 3 typically uses materials with good thermal insulation properties, such as at least one of foam plastic, aerogel, thermal insulation cotton, and expanding foam. Specifically, this application does not limit this. Furthermore, in the embodiments of this application, the insulation part 3 includes polyurethane thermal insulation cotton. Because the thermal conductivity of the foaming agent used in polyurethane thermal insulation cotton is lower than that of air, its closed-cell nature and high resistance to gas diffusion give it superior thermal insulation performance, reducing heat loss from the first flow channel a plate. The closed-cell structure of the polyurethane thermal insulation cotton also provides good waterproof and moisture-proof properties, preventing moisture from penetrating the first flow channel a plate and avoiding problems such as rust and corrosion. Of course, in other embodiments, the specific type of insulation part 3 can be selected as needed, and this application does not limit this.

[0070] In one embodiment, the cover assembly 10 further includes an insulating part 4, which is disposed on the first side 11 to electrically isolate the heat-conducting base 1 and the battery cell 20. Thus, if there is an electrical connection between the battery cell 20 and the heat-conducting base 1, insulation failure may lead to a short circuit, causing serious safety accidents such as overheating, fire, or even explosion. The insulating part 4, disposed on the first side 11, electrically isolates the heat-conducting base 1 from the battery cell 20, effectively blocking abnormal current conduction paths, avoiding short-circuit risks, and ensuring the electrical safety of the battery pack. During operation, the battery cell 20 generates an electromagnetic field. If there is a lack of effective insulation between it and the heat-conducting base 1, electromagnetic interference may be conducted to other components through the heat-conducting base 1, affecting the electrical performance of the entire system. The insulating part 4 can block the propagation of electromagnetic interference, ensuring the normal operation of each electronic component within the system and improving the stability and reliability of the system. If there is an electrical connection between the battery cell 20 and the heat-conducting base 1, electrochemical corrosion may occur in humid environments, leading to increased contact resistance and aggravated heating. The insulation part 4 can effectively isolate the battery cell 20 from the heat-conducting base 1, prevent electrochemical corrosion, and extend the service life of the battery pack.

[0071] Reference Figure 1The groove 111 extends along the first direction and corresponds to the explosion-proof valves 201 of the multiple battery cells 20 arranged along the first direction. The explosion-proof valves 201 of the multiple battery cells 20 exhaust gas through the groove 111. Since the inner wall of the groove 111 and the end face of the battery module 200 form a closed pressure relief channel, when the internal pressure of the multiple battery cells 20 is too high, the multiple explosion-proof valves 201 open and the high-temperature discharge is discharged through the closed pressure relief channel. However, the high-temperature discharge will spread along the first direction to the adjacent battery cells 20 or electrical units, resulting in battery pack safety hazards and chain reaction risks. By setting an insulating part 4, and having a weak area corresponding to the explosion-proof valve 201, when the explosion-proof valve 201 is opened, the high-temperature and high-pressure ejected material causes the weak area to rupture, allowing the high-temperature and high-pressure ejected material to smoothly enter the groove 111. The unruptured part of the insulating part 4 divides the pressure relief channel into multiple closed sub-channels spaced apart. These multiple closed sub-channels correspond one-to-one with multiple explosion-proof valves 201. When the internal pressure of multiple battery cells 20 is too high, the multiple explosion-proof valves 201 open, and the high-temperature ejected material is discharged through the multiple sub-channels, preventing pressure from accumulating inside the battery cells 20, thereby reducing the risk of battery cell 20 rupture or explosion. In addition, since the periphery of the sub-channels is sealed and abuts against the end face of the battery module 200, it can not only prevent the high-temperature ejected material from spreading to adjacent battery cells 20 or electrical units along the first direction, but also prevent the high-temperature ejected material from spreading to adjacent battery cells 20 or electrical units along the second direction. The second direction intersects with the first direction, thereby greatly reducing the safety hazards and chain reaction risks of the battery pack.

[0072] Reference Figure 5 In one embodiment, the insulating part 4 is provided with a clearance hole 41, which is correspondingly provided with and connected to the groove 111. The clearance hole is used to avoid the explosion-proof valve 201. In this way, the high-temperature gas after the battery cell 20 is depressurized will prevent the insulating part 4 from melting. After the insulating part 4 melts, the melted liquid will drip onto the pressure relief valve of the battery cell 20, causing the pressure relief valve to be covered and blocked, thus affecting the venting and pressure relief of the battery cell 20.

[0073] It should be noted that the type of insulating part 4 can be selected as needed. For example, in some embodiments, the insulating part 4 includes at least one of PC board, PET board, mica board, and epoxy resin board. Of course, in other embodiments, the type of insulating part 4 can be selected as needed, and this application does not limit it in this regard.

[0074] In one embodiment, the heat-conducting base 1 is made of at least one of aluminum and aluminum alloys. Aluminum and aluminum alloys possess excellent thermal conductivity, enabling them to rapidly conduct heat generated by the battery cell 20 to the cover portion 2, improving heat dissipation efficiency and thus reducing the operating temperature of the battery cell 20. Aluminum and aluminum alloys have relatively low density, and using these materials as the heat-conducting base 1 can significantly reduce the overall weight of the cover assembly 10. Aluminum and aluminum alloys possess a certain strength and rigidity, preventing damage to the heat-conducting base 1 due to deformation or breakage. Aluminum and aluminum alloys can form a dense oxide film in air, preventing further oxidation reactions; this anti-oxidation property helps maintain the long-term stability of the heat-conducting base 1. Compared to some other high-performance thermally conductive materials, aluminum and aluminum alloys are relatively inexpensive. This helps reduce the manufacturing cost of the battery pack and improve the product's cost-effectiveness.

[0075] Furthermore, the thermally conductive base 1, made of at least one of aluminum and aluminum alloys, maintains structural and performance stability at high temperatures. It retains its physical and chemical properties within a certain temperature range, without deformation or performance degradation. Under sustained high temperatures, the thermally conductive base 1 exhibits high plasticity and low resistance, with intensified atomic diffusion accompanied by complete recrystallization, which is beneficial for improving the microstructure. It also boasts excellent heat dissipation; the thermally conductive base 1 effectively dissipates internal heat, reducing the temperature inside the battery pack and preventing overheating of the battery cell 20.

[0076] It should be noted that, in the embodiments of this application, the material of the heat-conducting base 1 includes AL-3003MOD material. Since AL-3003MOD is an aluminum-manganese alloy, it has high thermal conductivity. The heat-conducting base 1 made of this material can quickly conduct the heat generated by the battery cell 20 to the cover portion 2, improving the heat dissipation efficiency of the battery cell 20. AL-3003MOD aluminum alloy has moderate hardness and good mechanical properties, with a tensile strength ≥130MPa, yield strength ≥115MPa, and elongation ≥5%. This strength and toughness can withstand certain mechanical stress and vibration, ensuring the structural stability of the cover assembly 10. AL-3003MOD aluminum alloy has good corrosion resistance, and a dense oxide film easily forms on its surface, resisting the erosion of various chemicals. This helps extend the service life of the heat-conducting base 1, reduce maintenance costs, and adapt to various complex environmental conditions. The AL-3003MOD material helps reduce the overall weight of the cover assembly 10, conforming to the trend of lightweight design. Compared with other high-performance thermally conductive materials, AL-3003MOD aluminum alloy has a relatively low cost, which helps to reduce the manufacturing cost of the cover assembly 10.

[0077] In some embodiments, the cover 2 is made of at least one of aluminum and aluminum alloys. Aluminum and aluminum alloys have extremely high thermal conductivity, enabling rapid transfer of heat generated by the battery cell 20 to the heat exchange fluid, significantly improving heat dissipation efficiency. Aluminum and aluminum alloys have low density, significantly reducing the weight of the cover 2 compared to traditional heat dissipation materials such as copper. A dense oxide film easily forms on the surface of aluminum and aluminum alloys, providing excellent corrosion resistance. In liquid cooling systems, this property helps prevent corrosion of the cover 2 by the cooling medium, extending its service life. Compared to precious metals such as copper, aluminum and aluminum alloys are less expensive, helping to reduce the manufacturing cost of the cover 2. Due to the excellent corrosion resistance and mechanical properties of aluminum and aluminum alloys, the cover 2 has low maintenance costs during long-term use, reducing the frequency of replacement and repair.

[0078] Furthermore, the cover portion 2, made of at least one of aluminum and aluminum alloys, maintains structural and performance stability at high temperatures. It retains its physical and chemical properties within a certain temperature range, without deformation or performance degradation. Under sustained high temperatures, the cover portion 2, made of at least one of aluminum and aluminum alloys, exhibits high plasticity and low resistance, with intensified atomic diffusion accompanied by complete recrystallization, which is beneficial for improving the microstructure. It also has excellent heat dissipation; the cover portion 2, made of at least one of aluminum and aluminum alloys, has excellent thermal conductivity, effectively dissipating internal heat, reducing the temperature inside the battery pack, and preventing overheating of the battery cell 20.

[0079] It should be noted that, in the embodiments of this application, the material of the cover part 2 includes AL-3003 / 4343MOD material. AL-3003 belongs to the aluminum-manganese alloy series, possessing excellent corrosion resistance, resisting the erosion of various chemicals, maintaining good rust prevention in humid environments, and being easy to process and form, meeting the manufacturing needs of complex shapes and structures. It also has excellent weldability, facilitating various welding operations during the manufacturing process. 4343 aluminum alloy is an aluminum-silicon alloy with good brazing performance and a high silicon content. In composite aluminum plates, it is typically used as a brazing layer or surface coating to improve the brazing effect and surface properties of the aluminum plate, such as enhancing wear resistance and heat resistance. After the two are combined, the cover part 2 possesses both the corrosion resistance, ease of processing, and weldability of AL-3003, and through the addition of the 4343 alloy, it achieves better brazing performance and specific surface properties. The AL-3003 / 4343MOD material has high thermal conductivity, which can quickly conduct the heat generated by the battery pack to the cooling medium, significantly improving heat dissipation efficiency and maintaining the battery cell 20 within a suitable operating temperature range, avoiding performance degradation or safety hazards caused by overheating.

[0080] Meanwhile, aluminum and aluminum alloys have a lower density, which significantly reduces the weight of the cover 2 compared to traditional heat dissipation materials such as copper. This helps to improve the driving range of electric vehicles, reduce energy consumption, and enhance the portability and installation flexibility of the energy storage system. This material combines the excellent processing performance and formability of 3003 aluminum alloy with the high strength and corrosion resistance of 4343 aluminum alloy, giving the cover 2 high strength and rigidity. It can withstand the mechanical stress and vibration generated during battery pack operation, ensuring its structural stability. It maintains stable performance even under long-term use, is not prone to fatigue failure, and can be used for extended periods in harsh environments, extending its service life and reducing maintenance costs.

[0081] Reference Figure 3 In some embodiments, the first flow channel a has multiple inlet channels a1 and multiple inlet channels a2. The multiple inlet channels a1 are connected in parallel, the multiple inlet channels a2 are connected in parallel, and each inlet channel a1 corresponds one-to-one with its corresponding inlet channel a2. Thus, the parallel connection of multiple inlet channels a1 ensures that the coolant is evenly distributed to each heat exchange area, avoiding excessively high or low flow rates in certain areas, thereby improving the overall heat exchange efficiency. The parallel connection reduces the flow resistance of the coolant in the flow channel, allowing the coolant to flow more smoothly and accelerating the heat exchange rate. The series connection of each inlet channel a1 with its corresponding inlet channel a2 allows the coolant to form a complete flow path within a single heat exchange unit, extending the residence time of the coolant in the heat exchange area and further enhancing the heat exchange effect. The parallel arrangement of multiple inlet channels a1 and a2 provides redundancy. If one channel becomes blocked or malfunctions, the others can continue to operate, ensuring stable operation of the heat exchange system. The one-to-one correspondence of the inlet channels a1 and a2 ensures a uniform coolant supply to each heat exchange area, preventing localized overheating or overcooling and improving system stability and reliability.

[0082] Reference Figure 5 In one embodiment, the cover assembly 10 further includes an inlet nozzle 51 and an outlet nozzle 52, both of which are located on the first side 11. The inlet nozzle 51 is adapted to pass through the heat-conducting base 1 and connect to a plurality of parallel liquid inlet channels a1, and the outlet nozzle 52 is adapted to pass through the heat-conducting base 1 and connect to a plurality of parallel liquid inlet channels a2. This facilitates the connection of the inlet nozzle and the outlet nozzle to the channels for transporting heat exchange fluid in the liquid cooling plate used to cool the bottom of the battery cell 20. This direct connection reduces the turning and detour of the coolant during the flow process, thereby optimizing the fluid path and reducing the space waste caused by the complexity of the fluid path.

[0083] Continue to refer to Figure 5In some embodiments, the cover assembly 10 further includes an inlet hose 53 and an outlet hose 54. The inlet nozzle 51 is connected to a liquid cooling plate for cooling the bottom of the battery cell 20 via the inlet hose 53, and the outlet nozzle 52 is connected to the liquid cooling plate for cooling the bottom of the battery cell 20 via the outlet hose 54. Thus, the inlet hose 53 and outlet hose 54 have good flexibility and bendability, adapting to different installation spaces and layout requirements. Even in complex installation environments, the inlet nozzle 51 and outlet nozzle 52 of the cover assembly 10 can be easily connected to the liquid cooling plate without the strict limitations on angle and distance imposed by rigid pipe connections. Compared to rigid pipe connections, hose connections are simpler and more convenient. Installers can more easily slip the inlet hose 53 and outlet hose 54 onto the inlet nozzle 51 and outlet nozzle 52 respectively, and secure them with appropriate connectors, reducing installation time and difficulty and improving installation efficiency.

[0084] There are various ways to achieve a thermally conductive connection between the battery module 200 and the cover assembly 10. For example, in one embodiment, the battery module 200 and the cover assembly 10 are in direct contact. In other embodiments, a thermally conductive medium can be provided between the battery module 200 and the cover assembly 10. Specifically, this application does not limit this approach.

[0085] It should be noted that the type of thermal conductive medium can be selected as needed. For example, the thermal conductive medium may include thermally conductive silicone pads, thermally conductive grease, or thermally conductive gel. Specifically, this application does not limit this.

[0086] In some embodiments, the battery pack further includes a liquid cooling plate disposed at the bottom of the battery module 200. The liquid cooling plate exchanges heat with the top and bottom of the battery cell 20 through the cover assembly 10 at the top of the battery module 200 and the liquid cooling plate at the bottom of the battery module 200, respectively, thereby improving the heat dissipation efficiency of the battery module 200 and avoiding the occurrence of temperature gradients in the Z-axis direction of the battery cell 20, thus improving the service life of the battery module 200.

[0087] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A box cover assembly, characterized in that, include: A heat-conducting base having a first side and a second side disposed opposite to each other, the first side being disposed toward the battery cell, and the first side having a groove for venting the explosion-proof valve of the battery cell. A cover portion is provided on the second side of the heat-conducting base, and the cover portion and the heat-conducting base are adapted to enclose and form a first flow channel for conveying heat exchange fluid; The cover portion is provided with a mating groove, and the second side has a positioning protrusion, wherein the mating groove and the positioning protrusion are fitted together.

2. The box cover assembly according to claim 1, characterized in that, The first side is partially recessed to correspond to a partial protrusion on the second side, such that the first side forms the groove and the second side forms the positioning protrusion.

3. The box cover assembly according to claim 1, characterized in that, The inner wall of the first flow channel is at least partially irregular.

4. The box cover assembly according to claim 3, characterized in that, The cover portion is recessed towards the heat-conducting base from the side opposite to the heat-conducting base, so as to form a corresponding boss on the side of the cover portion facing the heat-conducting base.

5. The box cover assembly according to claim 1, characterized in that, The heat-conducting base and the cover are fixed together by brazing.

6. The box cover assembly according to claim 5, characterized in that, The mating groove is provided through the cover portion along the direction from the first side to the second side.

7. The lid assembly according to any one of claims 1 to 6, characterized in that, It also includes a heat insulation part, which is located on the side of the cover part away from the heat-conducting base and connected to the cover part.

8. The box cover assembly according to claim 7, characterized in that, The insulation part includes insulation cotton or foam.

9. The lid assembly according to any one of claims 1 to 6, characterized in that, It also includes an insulating part disposed on the first side for electrically isolating the heat-conducting base and the battery cell.

10. The box cover assembly according to claim 9, characterized in that, The insulating part is provided with a clearance hole, which is corresponding to and connected to the groove. The clearance hole is used to avoid the explosion-proof valve.

11. The box cover assembly according to claim 9, characterized in that, The insulating part includes at least one of PC board, PET board, mica board and epoxy resin board.

12. The lid assembly according to any one of claims 1 to 6, characterized in that, The material of the heat-conducting base includes at least one of aluminum and aluminum alloys; and / or, The material of the cover includes at least one of aluminum and aluminum alloys.

13. A box, characterized in that, include: The main body of the box has an open receiving cavity for accommodating the battery module; The lid assembly as described in any one of claims 1 to 12, wherein the lid assembly covers the opening and is connected to the box body.

14. A battery pack, characterized in that, include: The housing as described in claim 13; The battery module is installed in the receiving cavity, and the battery module is thermally connected to the cover assembly.

15. An electrical appliance, characterized in that, Includes the battery pack as described in claim 14.

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