Battery pack and electric device

Abstract

The application discloses a battery pack and an electric equipment, and belongs to the technical field of batteries. The battery pack comprises a box body, a battery module and a heat exchange part. The bottom of the box body is provided with a first heat exchange flow channel used for conveying heat exchange liquid. The battery module is installed in the box body, and the bottom of the battery module is in heat conduction connection with the bottom of the box body. The heat exchange part is arranged on the top of the battery module. The heat exchange part is provided with a second heat exchange flow channel used for conveying heat exchange liquid, and the heat exchange part is in heat conduction connection with the top of the battery module. The heat exchange part provided with the second heat exchange flow channel is arranged on the top of the battery module, so that the upper and lower surfaces of the battery module are cooled. The double-sided cooling can effectively reduce the temperature gradient in the battery module, avoid local overheating, and improve the cycle life and safety of the battery. The first heat exchange flow channel is directly integrated on the bottom of the box body, so that the space for installing the battery module in the box body is reduced, the capacity of the battery pack is prevented from being reduced, and the weight of the battery pack is also reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack and electrical device. Background Technology

[0002] To avoid a large temperature difference between the top and bottom of the battery module, related technologies typically install a first heat exchanger on the top of the battery module and a second heat exchanger on the bottom of the housing. After the battery module is installed in the housing, the bottom of the battery module is thermally connected to the second heat exchanger. However, this method reduces the space available for installing the battery module inside the housing, resulting in a decrease in the battery pack capacity. Utility Model Content

[0003] This application provides a battery pack and electrical equipment, aiming to solve the problem in the related art that the reduced space for installing battery modules inside the casing leads to a decrease in the battery pack's capacity.

[0004] To achieve the above objectives, according to a first aspect of this application, a battery pack is provided, comprising:

[0005] The housing has a first heat exchange channel formed at its bottom, which is used to transport heat exchange fluid.

[0006] A battery module is installed inside the housing, with its bottom thermally connected to the bottom of the housing; and...

[0007] A heat exchange section is located on the top of the battery module. The heat exchange section forms a second heat exchange channel for conveying heat exchange fluid. The heat exchange section is thermally connected to the top of the battery module.

[0008] Optionally, it also includes a first heat-conducting part, through which the battery module and the side wall of the housing are thermally connected.

[0009] Optionally, the material of the first thermally conductive part includes at least one of thermally conductive adhesive, thermally conductive metal, thermally conductive ceramic, or foam.

[0010] Optionally, at least one of the heat exchange section and the bottom of the housing is thermally connected to the first heat-conducting section.

[0011] Optionally, multiple battery modules are provided, and the multiple battery modules are arranged at intervals inside the housing;

[0012] The battery pack also includes a second heat-conducting part, and two adjacent battery modules are thermally connected through the second heat-conducting part.

[0013] Optionally, the material of the second thermally conductive part includes at least one of thermally conductive adhesive, thermally conductive silicone, thermally conductive metal, thermally conductive ceramic, or foam.

[0014] Optionally, at least one of the bottom of the housing and the heat exchange section is thermally connected to the second heat-conducting section.

[0015] Optionally, the housing is provided with an opening;

[0016] The heat exchange section is covered by the opening and connected to the housing.

[0017] Optionally, a sealing ring is also included, which is sandwiched between the heat exchange section and the periphery of the opening to seal the gap between the heat exchange section and the housing.

[0018] According to a second aspect of this application, an electrical device is provided, including a battery pack as described above.

[0019] According to a third aspect of this application, an electrical device is provided, including a battery pack as described above. In the battery pack of this application embodiment, a first heat exchange channel is provided at the bottom of the housing, and a heat exchange section with a second heat exchange channel is provided at the top of the battery module, achieving double-sided heat dissipation of the battery module. Double-sided cooling can effectively reduce the temperature gradient inside the battery module, avoiding localized overheating, thereby improving the battery's cycle life and safety. Through thermally conductive connections, the bottom and top of the battery module are made into close contact with the bottom of the housing and the heat exchange section, respectively, reducing thermal resistance and improving heat conduction efficiency. The heat exchange fluid transported in the heat exchange channel can quickly absorb and carry away the heat generated by the battery module, achieving efficient heat exchange and ensuring that the battery module operates within a suitable temperature range. Furthermore, the first heat exchange channel is directly integrated into the bottom of the housing, eliminating the need for an additional bottom heat exchange section, reducing the space occupied by the battery module inside the housing, preventing a decrease in battery pack capacity, and also reducing the weight of the battery pack. The second heat exchange channel is located at the top and is thermally connected to the top of the battery module, making full use of the space at the top of the battery pack and avoiding the occupation of surrounding space in traditional side cooling or bottom cooling designs.

[0020] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0023] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in an exemplary embodiment of this disclosure;

[0024] Figure 2 yes Figure 1 A cross-sectional view of the battery pack shown;

[0025] Figure 3 yes Figure 1 An exploded view of the battery pack shown.

[0026] Figure 4 This is a schematic diagram of the structure of the heat exchanger provided in an exemplary embodiment of this disclosure;

[0027] Figure 5 yes Figure 4 A schematic diagram of the structure of the heat exchange section and the heat-conducting connection of the plate;

[0028] Figure 6 yes Figure 4 An exploded schematic diagram of the heat exchange section shown.

[0029] Figure 7 yes Figure 4 An exploded schematic diagram of the heat exchange section shown.

[0030] Figure 8 yes Figure 7 A magnified view of part A shown below;

[0031] Figure 9 yes Figure 7 A schematic diagram of the structure of the planar plate shown (from one perspective);

[0032] Figure 10 yes Figure 7 A schematic diagram of the structure of the planar plate shown (from another perspective).

[0033] Explanation of reference numerals in the attached figures:

[0034] 100. Battery pack; 10. Housing; 11. First heat exchange channel; 12. Opening; 20. Battery module; 21. Battery cell; 22. Battery plate; 30. Heat exchange section; 31. Second heat exchange channel; 32. First side; 321. Heat exchange area; 322. Pressure relief area; 323. Groove; 33. Flow channel plate; 331. Mating part; 34. Flat plate; 341. Second side; 342. Positioning part; 40. First heat conduction part; 50. Second heat conduction part; 60. Sealing ring; 80. Insulation layer; 90. Insulating and heat conduction layer; 110. Thermal conductive adhesive. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0036] This application provides an electrical device, including a battery pack 100.

[0037] It should be noted that the electrical equipment can be vehicles, energy storage power supplies, consumer electronics, medical devices, or smart cities, etc. Specifically, this application does not limit this.

[0038] Reference Figures 1 to 3 In one embodiment, the battery pack 100 includes a housing 10, a battery module 20, and a heat exchange section 30. A first heat exchange channel 11 is formed at the bottom of the housing 10 for conveying heat exchange fluid. The battery module 20 is installed inside the housing 10, and the bottom of the battery module 20 is thermally connected to the bottom of the housing 10. The heat exchange section 30 is disposed at the top of the battery module 20, and a second heat exchange channel 31 is formed in the heat exchange section 30 for conveying heat exchange fluid. The heat exchange section 30 is thermally connected to the top of the battery module 20.

[0039] In the battery pack 100 of this embodiment, a first heat exchange channel 11 is provided at the bottom of the housing 10, and a heat exchange section 30 with a second heat exchange channel 31 is provided at the top of the battery module 20, achieving double-sided heat dissipation of the battery module 20. Double-sided cooling effectively reduces the temperature gradient inside the battery module 20, preventing localized overheating and thus improving battery cycle life and safety. Through thermally conductive connections, the bottom and top of the battery module 20 are in close contact with the bottom of the housing 10 and the heat exchange section 30, respectively, reducing thermal resistance and improving heat transfer efficiency. The heat exchange fluid transported in the heat exchange channel can quickly absorb and carry away the heat generated by the battery module 20, achieving efficient heat exchange and ensuring that the battery module 20 operates within a suitable temperature range. Furthermore, the first heat exchange channel 11 is directly integrated into the bottom of the housing 10, eliminating the need for an additional bottom heat exchange section, reducing the space occupied by the battery module 20 within the housing 10, preventing a decrease in the battery pack 100's capacity, and also reducing the weight of the battery pack 100. The second heat exchange channel 31 is located at the top and is thermally connected to the top of the battery module 20, making full use of the space above the battery pack 100 and avoiding the occupation of surrounding space in traditional side cooling or bottom cooling designs.

[0040] Since the housing 10 provides a closed protective space for the battery module 20, it can effectively prevent dust, moisture, impurities, etc. from the external environment from entering the battery module 20 and avoid damaging it. At the same time, the housing 10 can also provide a certain degree of mechanical protection, reducing the damage to the battery module 20 under impact, compression, and other conditions, and improving the safety and reliability of the battery pack 100.

[0041] Continue to refer to Figure 2 and Figure 3 In some embodiments, the battery pack 100 further includes a first heat-conducting part 40, through which the battery module 20 is thermally connected to the side wall of the housing 10. This allows for heat dissipation not only through heat exchange channels at the bottom of the housing 10 and the top of the battery module 20, but also through the heat-conducting part 40 connecting the side wall of the battery module 20 to the side wall of the housing 10, further expanding the heat dissipation path. This enables the battery module 20 to conduct and dissipate heat in three-dimensional space, forming a comprehensive heat dissipation network, greatly improving heat dissipation efficiency, effectively preventing localized high-temperature areas inside the battery module 20, and ensuring uniform battery temperature distribution. Furthermore, while performing its heat conduction function, the first heat-conducting part 40 also provides mechanical support. It fills the gap between the battery module 20 and the side wall of the housing 10, increasing the connection strength between the battery module 20 and the housing 10, reducing vibration and shaking of the battery module 20 during vehicle operation, and improving the overall structural stability of the battery pack 100.

[0042] During charging and discharging, the battery expands and contracts due to temperature changes, resulting in thermal stress inside the battery module 20 and between the battery module 20 and the housing 10. The first heat-conducting part 40 has a certain degree of elasticity and flexibility, which can buffer and alleviate these thermal stresses, preventing the battery module 20 from deforming, being damaged, or separating from the housing 10 due to excessive thermal stress, thus extending the service life of the battery pack 100.

[0043] The first heat-conducting part 40 typically uses a highly thermally conductive material, thus enabling rapid heat transfer from the sidewalls of the battery module 20 to the sidewalls of the housing 10. Specifically, the material of the first heat-conducting part 40 can be selected as needed. For example, the first heat-conducting part 40 may include at least one of thermally conductive adhesive, thermally conductive metal, thermally conductive ceramic, or foam. This application does not impose any specific limitations on this. Furthermore, the sidewalls of the housing 10 generally have a large surface area, allowing for more effective heat exchange with the external environment, thereby accelerating heat dissipation and ensuring that the battery module 20 remains within a suitable operating temperature range.

[0044] In some embodiments, at least one of the heat exchange section 30 and the bottom of the housing 10 is thermally connected to the first heat-conducting section 40. Thus, the battery module 20 generates a large amount of heat during charging and discharging. If this heat cannot be dissipated in time, the battery temperature will continue to rise. When the temperature exceeds a certain limit, it may cause thermal runaway of the battery, leading to serious safety accidents such as fire or explosion. By exchanging heat between the heat exchange section 30 and the first heat-conducting section 40, which absorbs heat from the side of the battery module 20, the heat generated on the side of the battery module 20 can be quickly removed, effectively controlling the temperature of the battery module 20 and avoiding safety risks caused by overheating.

[0045] Reference Figure 2 and Figure 3 In some embodiments, multiple battery modules 20 are provided, spaced apart within the housing 10. The battery pack 100 also includes a second heat-conducting part 50, through which adjacent battery modules 20 are thermally connected. Thus, multiple battery modules 20 generate heat during charging and discharging. If this heat cannot be dissipated in time, it can lead to excessively high local temperatures, affecting battery performance and lifespan. The second heat-conducting part 50 connects adjacent battery modules 20, enabling rapid heat transfer from one module to another. The heat is then dissipated to the external environment through the first heat exchange channel 11 at the bottom of the housing 10, the heat exchange part 30 at the top, and the first heat-conducting part 40 on the side, forming a more efficient heat conduction path and significantly improving the overall heat dissipation efficiency of the battery pack 100. Furthermore, uneven heat generation may exist between different battery modules 20; for example, modules closer to the charging port or high-load operating areas may generate more heat. The thermally conductive connection of the second heat-conducting part 50 can distribute heat evenly between modules, avoid local overheating or overcooling, and ensure that all battery modules 20 can operate within a suitable temperature range, thereby improving the overall performance and stability of the battery pack 100.

[0046] In addition, the second heat-conducting part 50, while performing the function of heat conduction, can also serve as a mechanical support and fixation. It can fill the gap between adjacent battery modules 20, increase the connection strength between modules, reduce the relative displacement and shaking of battery modules 20 caused by vibration and bumps during vehicle operation, improve the overall structural stability of battery pack 100, and reduce the risk of damage to battery modules 20 caused by mechanical vibration.

[0047] It should be noted that the material of the second heat-conducting part 50 can be selected as needed. For example, the material of the second heat-conducting part 50 may include at least one of thermally conductive adhesive, thermally conductive metal, thermally conductive ceramic, or foam. Specifically, this application does not limit this.

[0048] In some embodiments, at least one of the bottom of the housing 10 and the heat exchange section 30 is thermally connected to the second heat-conducting section 50. Thus, when the bottom of the housing 10 is thermally connected to the second heat-conducting section 50, heat generated on the side of the battery module 20 can be transferred to the bottom of the housing 10 in contact with it through the second heat-conducting section 50. When the heat exchange section 30 is thermally connected to the second heat-conducting section 50, heat generated on the side of the battery module 20 can be transferred to the heat exchange section 30 in contact with it through the second heat-conducting section 50. This design effectively removes heat from the side of the battery module 20, improving the heat dissipation efficiency of the side of the battery module 20 and ensuring that the battery module 20 maintains a good operating temperature under various conditions.

[0049] Furthermore, when the bottom of the housing 10 and the heat exchange section 30 are simultaneously connected to the second heat-conducting section 50, the advantages of both can be fully utilized to achieve synergistic heat dissipation. This synergistic heat dissipation method can greatly improve the heat removal capacity of the battery module 20, making the temperature of the battery module 20 more uniform and stable, and reducing performance degradation and safety hazards caused by local overheating.

[0050] Refer again Figure 2 and Figure 3 In some embodiments, the housing 10 has an opening 12, and the heat exchange section 30 covers the opening 12 and is connected to the housing 10. Thus, the heat exchange section 30 can both cover the opening 12 and exchange heat with the top of the battery module 20. This design allows the heat exchange section 30 to function as both a cover and a heat dissipation component, eliminating the need for a separate cover and a dedicated top heat dissipation device, thus simplifying the overall structure of the battery system. Within a limited space, this design allows for a more efficient layout of the battery module 20 and other components, improving space utilization.

[0051] It should be noted that the heat exchange unit 30 is detachably connected to the housing 10. Thus, when the heat exchange unit 30 malfunctions or needs cleaning, the detachable connection method (such as bolt connection, snap connection, etc.) allows maintenance personnel to easily remove the heat exchange unit 30 from the housing 10 for inspection, repair or cleaning.

[0052] Reference Figure 3 In some embodiments, the battery pack 100 further includes a sealing ring 60, which is sandwiched around the periphery of the heat exchange section 30 and the opening 12 to seal the gap between the heat exchange section 30 and the housing 10. This prevents moisture from entering the battery pack 100, avoiding short circuits and damage to the battery module 20 and other electronic components due to moisture. Simultaneously, in dusty environments, it also prevents dust intrusion, reducing wear and corrosion of the internal components of the battery pack 100 and extending the equipment's service life.

[0053] In some embodiments, the battery pack 100 further includes a third heat-conducting section, through which the bottom of the battery module 20 and the bottom of the housing 10 are thermally connected. Thus, the battery module 20 generates a large amount of heat during charging and discharging. If this heat cannot be dissipated in time, it will cause the module temperature to rise, affecting battery performance and lifespan. The bottom of the battery module 20 is typically one of the areas where heat accumulates most severely. The third heat-conducting section can quickly conduct the heat generated at the bottom of the battery module 20 to the bottom of the housing 10, where it exchanges heat with the heat exchange fluid in the first heat exchange channel 11 at the bottom of the housing 10. This effectively reduces the temperature at the bottom of the module, preventing battery performance degradation due to localized overheating and extending the lifespan of the battery module 20.

[0054] It should be noted that the type of the third thermal conductive part can be selected as needed. For example, the type of the third thermal conductive part may include thermally conductive adhesive, thermally conductive silicone, or thermally conductive gel, etc. Specifically, this application does not limit this.

[0055] Reference Figure 4 In one embodiment, the heat exchange section 30 has a first side 32 facing the battery module 20. The first side 32 forms a heat exchange area 321 and a pressure relief area 322. The heat exchange area 321 is thermally connected to the battery module 20, and the pressure relief area 322 is provided with a groove 323 for venting the explosion-proof valve of the battery module 20. The area of ​​the heat exchange area 321 is S1, and the area of ​​the pressure relief area 322 is S2, wherein 0.1≤S2 / S1≤2. Thus, the heat exchange function and the safety pressure relief function are integrated into the same heat exchange section 30, avoiding the need for separate additional space or components for pressure relief, greatly improving the space utilization rate inside the battery pack 100, and helping to improve the energy density of the battery pack 100. The thermal connection between the heat exchange area 321 and the battery module 20 ensures that the heat of the battery during charging and discharging can be effectively transferred away through the heat exchange fluid, maintaining the battery pack 100 at a suitable temperature and ensuring performance and lifespan. The groove 323 in the pressure relief zone 322 is specifically designed for the explosion-proof valve of the battery module 20. When the battery pack 100 experiences thermal runaway due to overheating, internal short circuit, or other reasons, the explosion-proof valve can open in time, allowing the internal high-pressure gas to be safely discharged through the groove 323, preventing pressure buildup that could lead to an explosion or a more serious chain reaction. The setting of 0.1≤S2 / S1≤2 ensures that the pressure relief zone 322 has sufficient area while also ensuring that the heat exchange zone 321 has sufficient area to contact the battery module 20. This allows the heat exchange section 30 to provide sufficient exhaust space and channels for the explosion-proof valve, ensuring both the pressure relief capacity and good heat dissipation capacity of the heat exchange section 30.

[0056] If the area of ​​the pressure relief zone 322 is too large, resulting in an S2 / S1 ratio greater than 2, it will encroach on the area of ​​the heat exchange zone 321, weakening the overall heat dissipation performance. If the area of ​​the pressure relief zone 322 is too small, resulting in an S2 / S1 ratio less than 0.1, it may cause obstructed venting, preventing timely pressure release and increasing safety risks. If the area of ​​the heat exchange zone 321 is too small, resulting in an S2 / S1 ratio greater than 2, the contact area between the heat exchange fluid and the battery module 20 will be significantly reduced. This will prevent the heat generated by the battery module 20 from being carried away by the heat exchange fluid in time, causing the battery temperature to continue to rise. If the area of ​​the heat exchange zone 321 is too large, resulting in an S2 / S1 ratio less than 0.1, it will encroach on the area of ​​the pressure relief zone 322, causing the pressure relief zone 322 to become too small, thus obstructing venting and preventing timely pressure release, increasing safety risks.

[0057] It should be noted that the values ​​of S2 / S1 can be selected as needed. For example, the values ​​of S2 / S1 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2, etc. Specifically, this application does not limit the values ​​of S2 / S1.

[0058] Reference Figure 3 and Figure 5 In some embodiments, the battery module 20 includes a battery cell 21 and a heat exchanger 22. The terminal of the battery cell 21 is thermally connected to the heat exchange section 30 via the heat exchanger 22. The heat exchanger 22 has a connection surface facing the heat exchange section 30, and the area of ​​the connection surface is S3, where 0.2 ≤ S1 / S3 ≤ 4. Within this ratio range, a suitable contact area can be ensured between the heat exchanger 22 and the heat exchange section 30 for heat exchange, allowing the heat on the heat exchanger 22 to be sufficiently transferred to the heat exchange section 30. This avoids heat accumulation near the heat exchanger 22 due to insufficient area of ​​the heat exchange zone 321, which could cause the battery cell 21 to overheat, affecting battery performance and lifespan. Within this ratio range, suitable materials and sizes can be selected while meeting thermal management requirements, achieving effective cost control. As the connecting component between the terminal of the battery cell 21 and the heat exchange section 30, the heat exchanger 22 needs to withstand a certain amount of mechanical stress. When 0.2≤S1 / S3≤4, stress concentration can be effectively reduced, and the structural durability of battery pack 100 can be improved.

[0059] Furthermore, if the connection area S3 of the heat exchanger 22 is too large, resulting in S1 / S3 being less than 0.2, it means that a large amount of heat is input into the heat exchange section 30 through the heat exchanger 22, causing heat to concentrate locally in the heat exchange zone 321, affecting the efficiency of the heat exchange fluid and the life of the materials. If the area S1 of the heat exchange zone 321 is much larger than the connection area S3 of the heat exchanger 22, resulting in S1 / S3 being greater than 4, it means that the potential of the heat exchange section 30 is not being fully utilized, resulting in waste.

[0060] It should be noted that the values ​​of S1 / S3 can be selected as needed. For example, the values ​​of S1 / S3 can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.3, 1.7, 2, 2.5, 3, 3.4, 3.8, or 4, etc. Specifically, this application does not limit this. In addition, the method of thermal connection between the heat exchanger 22 and the heat exchanger 30 can be selected as needed. For example, in one embodiment, the heat exchanger 22 can be directly attached to the heat exchanger 30. See reference. Figure 3 In another embodiment, the pad 22 can also be thermally connected to the heat exchange section 30 via thermally conductive adhesive 110. Specifically, this application does not limit this aspect.

[0061] Reference Figure 6 In one embodiment, the heat exchange section 30 includes a flow channel plate 33 and a flat plate 34. The flat plate 34 is disposed on one side of the flow channel plate 33 and forms a second heat exchange flow channel 31 for conveying heat exchange fluid. A groove 323 is formed on the side of the flat plate 34 away from the flow channel plate 33 for venting the explosion-proof valve of the battery module 20. The side of the flat plate 34 away from the flow channel plate 33 is thermally connected to the battery module 20. In this way, when the heat exchange section 30 abuts against the battery module 20, that is, the periphery of the groove 323 is sealed against the battery module 20, so that the inner wall of the groove 323 and the end face of the battery module 20 form a sealed pressure relief channel. When the internal pressure of the battery cell is too high, when the explosion-proof valve opens, the high-temperature discharge material is discharged through the sealed pressure relief channel, avoiding the accumulation of pressure inside the battery cell, thereby reducing the risk of battery cell rupture or explosion. Furthermore, because the periphery of the groove 323 is sealed against the end face of the battery module 20, high-temperature discharge will not leak from the sealed contact point between the periphery of the groove 323 and the end face of the battery module 20. This prevents the high-temperature discharge from spreading to the cells or electrical units adjacent to the periphery of the groove 323, reducing the safety hazards and chain reaction risks of the battery pack 100. This pressure relief channel design enables thermoelectric separation, allowing the thermal runaway pressure relief zone 322 to be independent of the power transmission zone, significantly reducing the probability of internal high-voltage arcing and sparking failure during thermal runaway.

[0062] It should be noted that in the relevant technology, the housing 10 of the battery pack 100 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 technology for the specific structure of the air duct is already mature, it will not be described in detail here.

[0063] Furthermore, the groove 323 is positioned directly above the explosion-proof valve, and the heat exchange channel is located at the top of the cell's terminal post and is thermally connected to the top of the terminal post. Thus, the groove 323, positioned directly above the explosion-proof valve, provides a direct and precise channel for the valve to release gas. When an abnormal situation occurs in the cell (such as overheating or overcharging) causing the explosion-proof valve to open, gas can be quickly and directionally discharged through the groove 323, preventing gas accumulation inside the battery pack 100, effectively reducing the risk of explosion or fire, and improving overall safety. The heat exchange channel, located at the top of the cell's terminal post and thermally connected to the top of the terminal post, can directly dissipate heat from the core heat-generating area of ​​the cell. As a key component for current transmission in the cell, the terminal post generates a significant amount of heat during operation. The heat exchange fluid transported through the heat exchange channel can quickly remove this heat, reducing the terminal post temperature and preventing performance degradation or safety hazards caused by overheating.

[0064] Reference Figures 7 to 10 In one embodiment, the planar plate 34 has a second side 341 facing the flow channel plate 33. The second side 341 is provided with a positioning part 342. The flow channel plate 33 has a mating part 331 adapted to the positioning part 342 on the side facing the planar plate 34. One of the positioning part 342 and the mating part 331 includes a positioning protrusion, and the other includes a positioning groove. In this way, the positioning protrusion and the positioning groove are installed together. This mating method not only ensures the accurate relative position between the flow channel plate 33 and the planar plate 34, but also enhances the connection stability between the two, avoids misalignment of the flow channel plate 33 and the planar plate 34 due to vibration, impact and other factors, and improves the subsequent welding quality of the flow channel plate 33 and the planar plate 34.

[0065] It should be noted that the planar plate 34 and the flow channel plate 33 are fixed by brazing. In this way, the brazing fills the gap between the planar plate 34 and the flow channel plate 33 by melting the brazing filler metal, forming a metallurgical bond with high connection strength. It can withstand greater pressure and vibration, ensuring that the heat exchange channel will not loosen or leak during long-term use.

[0066] Reference Figure 9 and Figure 10In one embodiment, the planar plate 34 has a partial recess on the side opposite to the flow channel plate 33, correspondingly protruding on the second side 341. This forms a groove 323 on the side of the planar plate 34 opposite to the flow channel plate 33, and a positioning protrusion on the second side 341. Thus, a stamping process is used to achieve a partial recess on the side of the planar plate 34 opposite to the flow channel plate 33, while simultaneously creating a corresponding protrusion on the second side 341. Compared to other processing methods, such as machining, stamping eliminates the need for material removal piece by piece; instead, it directly forms the plate through rapid extrusion using a die, significantly shortening processing time and improving the production efficiency of the planar plate 34. During the stamping process, the material undergoes plastic deformation under the action of the die, resulting in work hardening at the recessed side of the planar plate 34 opposite to the flow channel plate 33 and the protruding part on the second side 341. This work hardening increases the strength and hardness of the material, enhancing the overall structural strength of the planar plate 34, enabling it to better withstand external loads and vibrations, and extending the service life of the heat exchange section 30.

[0067] In one embodiment, the thermal conductivity of the flow channel plate 33 is lower than that of the planar plate 34. Thus, since the planar plate 34 is in direct contact with the battery module 20, it needs to quickly transfer the heat generated by the battery module 20 to the heat exchange channel and exchange heat with the heat exchange fluid. By making the thermal conductivity of the planar plate 34 greater than that of the flow channel plate 33, the contact thermal resistance of the planar plate 34 can be reduced, ensuring efficient heat transfer from the battery module 20 and preventing localized overheating of the battery module 20 that could lead to performance degradation or safety risks. The lower thermal conductivity of the flow channel plate 33 allows it to not only form a heat exchange channel with the planar plate 34 but also serve as insulation, reducing heat or cold exchange between the flow channel plate 33 and the heat exchange fluid. This allows the heat or cold from the heat exchange fluid to be transferred more concentratedly to the battery module 20 through the planar plate 34, thereby improving the heat exchange effect between the heat exchange fluid and the battery module 20.

[0068] It should be noted that the material used to manufacture the planar plate 34 can be selected as needed. For example, the material used to manufacture the planar plate 34 may include pure aluminum, copper, copper-aluminum composite materials, or high thermal conductivity graphite materials, etc. Specifically, this application does not limit this.

[0069] Reference Figure 6In some embodiments, the battery pack 100 further includes a thermal insulation layer 80. The thermal insulation layer 80 is disposed on the side of the flow channel plate 33 facing away from the flat plate 34 and / or the side facing the flat plate 34, and the thermal insulation layer 80 is integrally disposed with the flow channel plate 33. In this way, the thermal insulation layer 80 can effectively block the heat exchange fluid in the flow channel plate 33 from the external environment, and improve the heat exchange efficiency between the heat exchange fluid in the heat exchange channel and the battery module 20. If the thermal insulation layer 80 and the flow channel plate 33 are disposed separately, they need to be fixed by additional connection methods. These connection parts may have risks such as loosening or falling off, affecting the thermal insulation effect and structural stability. The integral disposal eliminates these connection parts, avoids failures caused by connection problems, and improves the reliability of the heat exchange part 30. The integral disposal of the thermal insulation layer 80 and the flow channel plate 33 reduces the number of processes and assembly steps in the production process, reduces labor costs, and greatly simplifies the installation process and improves installation efficiency.

[0070] In one embodiment, the flow channel plate 33 is coated with insulation material on the side facing away from the planar plate 34 and / or the side facing the planar plate 34 to form an insulation layer 80 integrally formed with the flow channel plate 33. Thus, insulation material can be applied to one or both sides of the flow channel plate 33, effectively reducing heat loss from the heat exchange fluid in the heat exchange channel to the external environment, allowing more heat to be transferred towards the planar plate 34, and improving the heat exchange efficiency of the battery module 20. The insulation layer 80 and the flow channel plate 33 are integrally formed through a coating process, with no obvious connection interface between them, eliminating problems such as loosening or detachment due to weak connection between the flow channel plate 33 and the insulation layer 80. The coated insulation layer 80 is thinner and fits more closely to the surface of the flow channel plate 33, making the heat exchange section 30 structurally compact, thereby effectively reducing the space required for installation. The coating process allows the insulation layer 80 to be coated directly during the production of the flow channel plate 33 without the need for additional assembly steps. This greatly simplifies the production process and improves the production of the heat exchange section 30.

[0071] Refer again Figure 6In some embodiments, the heat exchange section 30 further includes an insulating thermally conductive layer 90, which is used for thermally conductive connection with the battery module 20. The insulating thermally conductive layer 90 is integrally formed with the planar plate 34. This integral structure eliminates significant contact thermal resistance between the planar plate 34 and the insulating thermally conductive layer 90, improving the heat exchange efficiency between the battery module 20 and the heat exchange section 30. The integrated design allows for uniform conduction and dissipation of heat generated by the battery module 20, preventing localized overheating and improving the overall operational stability and reliability of the battery module 20. The integral molding of the insulating thermally conductive layer 90 and the planar plate 34 eliminates insulation gaps or weak points caused by loose assembly or connection, effectively preventing leakage between the battery module 20 and the heat exchange section 30 and ensuring safe operation. During long-term use, the integral structure prevents loosening or separation between the insulating thermally conductive layer 90 and the planar plate 34 due to environmental factors (such as vibration and temperature changes), ensuring long-term stability of insulation performance and reducing safety hazards caused by insulation failure. The integrated design reduces the number of parts and simplifies the design of the heat exchange section 30. Compared to the traditional split structure, it eliminates the need for additional connecting parts and complex assembly processes, making the entire heat dissipation system more compact and lightweight. This helps save space and reduce weight, meeting the miniaturization and lightweight design requirements of the battery module 20.

[0072] It should be noted that the material of the insulating thermally conductive layer 90 can be selected as needed. For example, the material of the insulating thermally conductive layer 90 includes at least one of epoxy resin, polyimide, and polytetrafluoroethylene. Specifically, this application does not limit the specific type of material of the insulating thermally conductive layer 90.

[0073] In one embodiment, an insulating and thermally conductive material is coated on the side of the planar plate 34 opposite to the flow channel plate 33 to form an insulating and thermally conductive layer 90 integrally formed with the planar plate 34. This coating process ensures that the insulating and thermally conductive material adheres tightly to the planar plate 34, eliminating the contact thermal resistance caused by uneven contact surfaces or air gaps in traditional assembly methods. Heat can be transferred more rapidly from the planar plate 34 to the insulating and thermally conductive layer 90, and then from the insulating and thermally conductive layer 90 to the battery module 20, significantly improving heat exchange efficiency. This helps maintain the battery module 20 and other devices at suitable operating temperatures, improving their performance and lifespan. Furthermore, the coating process is relatively simple and can be performed directly during the production of the planar plate 34 without additional assembly steps, improving production efficiency. Additionally, the amount of insulating and thermally conductive material used can be precisely controlled according to actual needs, avoiding material waste.

[0074] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0075] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0076] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0077] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery pack, characterized in that, include: The housing has a first heat exchange channel formed at its bottom, which is used to transport heat exchange fluid. A battery module is installed inside the housing, and the bottom of the battery module is thermally connected to the bottom of the housing. as well as, A heat exchange section is located on the top of the battery module. The heat exchange section forms a second heat exchange channel for conveying heat exchange fluid. The heat exchange section is thermally connected to the top of the battery module.

2. The battery pack according to claim 1, characterized in that, It also includes a first heat-conducting part, through which the battery module and the side wall of the housing are thermally connected.

3. The battery pack according to claim 2, characterized in that, The material of the first thermally conductive part includes at least one of thermally conductive adhesive, thermally conductive metal, thermally conductive ceramic, or foam.

4. The battery pack according to claim 2, characterized in that, At least one of the heat exchange section and the bottom of the housing is thermally connected to the first heat-conducting section.

5. The battery pack according to any one of claims 1 to 4, characterized in that, Multiple battery modules are provided, and the multiple battery modules are arranged at intervals inside the box. The battery pack also includes a second heat-conducting part, and two adjacent battery modules are thermally connected through the second heat-conducting part.

6. The battery pack according to claim 5, characterized in that, The material of the second thermally conductive part includes at least one of thermally conductive adhesive, thermally conductive silicone, thermally conductive metal, thermally conductive ceramic, or foam.

7. The battery pack according to claim 5, characterized in that, At least one of the bottom of the housing and the heat exchange section is thermally connected to the second heat-conducting section.

8. The battery pack according to any one of claims 1 to 4, characterized in that, The box body is provided with an opening; The heat exchange section is covered by the opening and connected to the housing.

9. The battery pack according to claim 8, characterized in that, It also includes a sealing ring, which is sandwiched between the heat exchange section and the periphery of the opening to seal the gap between the heat exchange section and the housing.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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