Battery pack and electric device

Abstract

The present application provides a battery pack and an electric device. The battery pack comprises a case, at least two battery modules, at least one wave-generating portion and a driving mechanism, wherein the case has a battery cavity, in which a cooling liquid is contained; the at least two battery modules are mounted in the battery cavity and arranged at intervals in a first direction; each wave-generating portion is located between two adjacent battery modules and is movably mounted in the battery cavity; and the driving mechanism drives the wave-generating portion to move.

Description

Battery pack and electric device

[0001] The present application claims priority to the Chinese patent application No. 202421265899.5, filed on June 4, 2024, with the Chinese Patent Office, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery pack and an electric device. BACKGROUND

[0003] The immersion heat dissipation technology has extremely high heat dissipation capacity. When the immersion heat dissipation technology is used, the cooling liquid is usually contained in a single battery pack, so that the battery module is in contact with the cooling liquid, and heat exchange is performed between the cooling liquid and the battery module to achieve cooling of the battery module. SUMMARY

[0004] In the related art, the cooling liquid in the battery pack has poor heat exchange effect, and the heat dissipation is uneven.

[0005] In a first aspect, a battery pack is provided, comprising

[0006] a box body, the box body being formed with a battery cavity, and the battery cavity containing a cooling liquid;

[0007] at least two battery modules, installed in the battery cavity, and the at least two battery modules being arranged at intervals along a first direction; and

[0008] at least one wave-making part, each wave-making part being between two adjacent battery modules and being movably installed in the battery cavity;

[0009] a driving mechanism configured to drive the wave-making part to move, so that at least part of the wave-making part is adapted to move close to or away from one of the two adjacent battery modules.

[0010] In a second aspect, an embodiment of the present application provides an electric device comprising a liquid cooling assembly. ADVANTAGEOUS EFFECTS

[0011] In the embodiments of the present application, by storing the cooling liquid in the box and installing at least two battery modules in the box, the at least two battery modules are arranged at intervals along the first direction, so that the cooling liquid can be in full contact with each battery module. When the battery module is heated, the temperature of the cooling liquid in direct contact with the battery module is increased. Since each wave-making part is between the adjacent two battery modules, and each wave-making part is driven by the driving mechanism to move at least part of the wave-making part close to or away from one of the adjacent two battery modules, so that the wave-making part will disturb the cooling liquid around it. This disturbance will induce the cooling liquid to flow, especially when the wave-making part moves close to or away from the battery module, it will push the cooling liquid to flow around the battery module, enhancing the convection of the cooling liquid around the battery module. The cooling liquid with increased temperature can quickly separate from the battery module, and the cooling liquid with low temperature which is not in direct contact with the battery module can quickly contact the battery module, thereby helping to break the temperature boundary layer around the battery module, ensuring that the low-temperature cooling liquid can contact the surface of the battery cell in time to complete heat exchange, thereby improving the heat exchange efficiency of the cooling liquid and the battery module, and making the cooling liquid in the battery pack have good heat exchange effect. In addition, the movement of the wave-making part can also cause the cooling liquid to produce vortex and mixing in the local area. This mixing will mix the cooling liquid with high temperature with the cooling liquid with low temperature, thereby reducing the local temperature. This mixing effect helps to reduce the formation of hot spots, improve the uniformity of cooling, and make the cooling liquid evenly dissipate heat, which helps to reduce the temperature gradient and make the temperature distribution of the surface of the battery module more uniform, thereby improving the performance and service life of the battery pack. When the wave-making part moves, it will continuously destroy and rebuild the cooling liquid boundary layer near the surface of the battery module. This destruction and rebuilding process helps to reduce thermal resistance and improve the ability of the cooling liquid to take away heat from the surface of the battery module. This means that less cooling liquid can be used under the same heat dissipation effect. BRIEF DESCRIPTION OF DRAWINGS

[0012] FIG. 1 is a perspective view of a battery pack according to some implementations of the present application;

[0013] FIG. 2 is a perspective view of a partial structure of the battery pack shown in FIG. 1;

[0014] FIG. 3 is a perspective view of a wave-making part of the battery pack shown in FIG. 2;

[0015] FIG. 4 is a cross-sectional view of the battery pack shown in FIG. 1;

[0016] FIG. 5 is a perspective view of a cover of the battery pack shown in FIG. 1;

[0017] FIG. 6 is a perspective view of a base of the battery pack shown in FIG. 1.

[0018] BRIEF DESCRIPTION OF DRAWINGS

[0019] 100, battery pack; 110, box body; 101, base; 102, cover; 103, sealing ring; 111, battery cavity; 112, liquid inlet; 113, liquid outlet; 114, first side wall; 115, second side wall; 116, communication port; 117, device cavity; 118, exhaust port; 120, battery module; 130, wave making part; 131, rotating shaft; 140, driving mechanism; 150, liquid level sensor. Embodiments of the present application

[0020] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is less than that of the second feature.

[0022] In the description of the present embodiment, the terms "up", "down", "left", "right", "front", "back" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used to distinguish the description, and have no special meaning.

[0023] The immersion heat dissipation technology has very high heat dissipation capacity. When the immersion heat dissipation technology is used, the cooling liquid is usually contained in a single battery pack, so that the battery module is in contact with the cooling liquid, and heat exchange is carried out between the cooling liquid and the battery module to realize the cooling of the battery module. In the related art, the cooling liquid in the battery pack has poor heat exchange effect and uneven heat dissipation.

[0024] In view of this, the application provides a battery pack. FIGS. 1-6 are structural schematic diagrams of an embodiment of the battery pack provided by the application. The battery pack provided by the application can improve the heat exchange efficiency between the battery module and the cooling liquid. The battery pack will be described in detail below in combination with the main drawings.

[0025] Referring to FIGS. 1-4, the battery pack 100 includes a box body 110, at least two battery modules 120, at least one wave-making part 130, and a driving mechanism 140. The box body 110 is formed with a battery cavity 111, the battery cavity 111 stores a cooling liquid, the at least two battery modules 120 are installed in the battery cavity 111, the at least two battery modules 120 are arranged at intervals along a first direction, each wave-making part 130 is between two adjacent battery modules 120 and is movably installed in the battery cavity 111, and the driving mechanism 140 is configured to drive the wave-making part 130 to move, so that at least part of the wave-making part 130 is adapted to move close to or away from one of the two adjacent battery modules 120.

[0026] In the embodiments of the present application, by storing the cooling liquid in the tank 110 and installing at least two battery modules 120 in the tank 110, the at least two battery modules 120 are arranged in a first direction with a spacing, so that the cooling liquid can be in full contact with each battery module 120. When the battery module 120 is heated, the temperature of the cooling liquid in direct contact with the battery module 120 rises. Since each wave-making part 130 is located between two adjacent battery modules 120, and each wave-making part 130 is driven by the driving mechanism 140 to move at least part of the wave-making part 130 close to or away from one of the two adjacent battery modules 120, so that the wave-making part 130 will disturb the cooling liquid around it. This disturbance will induce the cooling liquid to flow, especially when the wave-making part 130 moves close to or away from the battery module 120, it will push the cooling liquid to flow around the battery module 120, enhancing the convection of the cooling liquid around the battery module 120. The cooling liquid with a rising temperature can quickly separate from the battery module 120 without direct contact with the battery module 120, and the cooling liquid with a low temperature can quickly contact the battery module 120, thereby helping to break the temperature boundary layer around the battery module 120, ensuring that the low-temperature cooling liquid can contact the surface of the battery cell in time to complete heat exchange, thereby improving the heat exchange efficiency of the cooling liquid and the battery module 120, so that the cooling liquid in the battery pack 100 has good heat exchange effect. In addition, the movement of the wave-making part 130 can also cause the cooling liquid to produce vortex and mixing in the local area. This mixing will mix the cooling liquid with a rising temperature with the cooling liquid with a lower temperature, thereby reducing the local temperature. This mixing effect helps to reduce the formation of hot spots and improve the uniformity of cooling, so that the cooling liquid is evenly cooled, which helps to reduce the temperature gradient and makes the temperature distribution on the surface of the battery module 120 more uniform, thereby improving the performance and life of the battery pack 100. When the wave-making part 130 moves, it will constantly destroy and rebuild the cooling liquid boundary layer near the surface of the battery module 120. This destruction and rebuilding process helps to reduce thermal resistance and improve the ability of the cooling liquid to carry away heat from the surface of the battery module 120. This means that under the same heat dissipation requirement, less cooling liquid can be used to achieve the expected heat dissipation effect.

[0027] It should be noted that in fluid dynamics, the boundary layer is the region where the velocity gradient of the fluid near the solid surface changes significantly.

[0028] Exemplarily, referring to FIG. 2, in the embodiments of the present application, one end of at least one wave-making part 130 is rotatably mounted in the battery cavity 111 about an axis extending in a second direction, so that a portion of each wave-making part 130 is adapted to approach or move away from one of the two adjacent battery modules 120, and the second direction is arranged transversely to the first direction. Thus, when the wave-making part 130 is driven to rotate about the axis extending in the second direction, it causes the convection of the cooling liquid adjacent to the wave-making part in the battery cavity 111, so that the cooling liquid with increased temperature after heat exchange with the battery module 120 can quickly separate from the battery module 120, and the cooling liquid with low temperature that does not directly contact the battery module 120 can quickly contact the battery module 120 and exchange heat with the battery module 120, achieving the cooling of the battery module 120, thereby improving the heat exchange efficiency. The rotation of the wave-making part 130 causes its portion to continuously approach or move away from the battery module 120, which can cause the cooling liquid to generate vortex and mixing in the local area. Such mixing can mix the cooling liquid with increased temperature with the cooling liquid with lower temperature, thereby reducing the local temperature. Such mixing effect helps to reduce the formation of hot spots, improve the uniformity of cooling, and help to reduce the temperature gradient, so that the temperature distribution on the surface of the battery module 120 is more uniform, thereby improving the performance and life of the battery pack 100. When the wave-making part 130 moves, it continuously destroys and rebuilds the boundary layer of the cooling liquid near the surface of the battery module 120. Such destruction and rebuilding process helps to reduce the thermal resistance and improve the ability of the cooling liquid to take away heat from the surface of the battery module 120. In addition, the rotation of the wave-making part 130 can cause the liquid surface of the cooling liquid to be lifted, which can increase the contact area of the cooling liquid with the surface of the battery module 120, further enhancing the heat exchange effect.

[0029] In addition, the rotation of the wave-making part 130 can optimize the flow path of the cooling liquid in the battery cavity 111, so that the cooling liquid flows more effectively through the surface of the battery module 120, reducing the residence of the cooling liquid in the ineffective area, thereby reducing the demand for the amount of cooling liquid. Due to the improved heat exchange efficiency, the heat generated by the battery module 120 can be taken away by the cooling liquid more quickly, which means that less cooling liquid can be used to achieve the expected heat dissipation effect under the same heat dissipation requirement.

[0030] There are various types of driving mechanisms 140 that can be used to drive at least one wave-making portion 130 to rotate around an axis extending in the second direction. For example, the driving mechanism 140 can include a driving motor and a transmission gear set. In other embodiments, the driving mechanism 140 can also include a swing motor or the like. Exemplarily, the present application does not limit the driving mechanism 140. In addition, the technology of driving the wave-making portion to rotate by using a driving motor and a transmission gear set or a swing motor or the like is mature, and thus the present application does not repeat the details here. Of course, the present application does not limit the installation position of the driving mechanism 140. For example, in some embodiments, the driving mechanism 140 can be installed in the box 110. In other embodiments, the driving mechanism 140 can also be installed outside the box 110.

[0031] The shape of the wave-making portion 130 can be various, such as a spiral shape, a wave shape, a fan shape, or a turbine shape, and the like. Exemplarily, the present application does not limit the shape of the wave-making portion 130. Referring to FIG. 1, in the embodiments of the present application, the first direction and the second direction are arranged to intersect in the horizontal plane, and the wave-making portion 130 is arranged in a plate shape and extends in the second direction. In this way, the wave-making portion 130 can more effectively utilize the space inside the battery pack 100, especially in the horizontal direction. This can reduce the installation space and to some extent can reduce the volume of the battery pack 100. When the wave-making portion 130 extends in the second direction, it helps to form a stable flow pattern of the cooling liquid in the battery pack 100, reduces turbulence and dead zones, and thus ensures that the cooling liquid can uniformly flow through each battery module 120. When the plate-shaped wave-making portion 130 rotates around its axis, it can more effectively stir the cooling liquid, break the thermal boundary layer, and improve the heat exchange efficiency. The plate-shaped wave-making portion 130 usually has a large cross-sectional area, so that more cooling liquid with a temperature rising after heat exchange can quickly separate from the battery module 120, and more cooling liquid with a low temperature that does not directly contact the battery module 120 can quickly contact the battery module 120 and exchange heat with the battery module 120, thereby achieving cooling of the battery module 120 and improving the heat exchange efficiency.

[0032] It should be noted that in the embodiments of the present application, the low temperature is relative to the cooling liquid with a rising temperature after heat exchange. In addition, the wave-making portion 130 can be made of various materials, such as metal, plastic, or ceramic, and the like. Exemplarily, the present application does not limit the material of the wave-making portion 130.

[0033] Referring to FIGS. 2 and 3, the first direction and the second direction are arranged to intersect in a horizontal plane, and the other end of the wave-making part 130 is rotatably connected to the box body 110 through a rotating shaft 131, the rotating shaft 131 is arranged to extend along the second direction, and the rotating shaft 131 is arranged adjacent to the top wall of the box body 110. In this way, since the first direction and the second direction are arranged to intersect, the wave-making part 130 can correspond to more areas of the battery module 120 when rotating, so that more cooling liquid with a temperature increased after heat exchange with the battery module 120 can be quickly separated from the battery module 120, and more cooling liquid with a low temperature that does not directly contact the battery module 120 can be quickly contacted with the battery module 120 and heat-exchanged with the battery module 120 to cool the battery module 120, thereby improving the heat exchange efficiency. The rotating shaft 131 is arranged to extend along the second direction, so that the wave-making part 130 can generate a large stirring effect when rotating, which helps to break the thermal boundary layer in the cooling liquid and enhances the heat exchange efficiency. Through the stirring effect of the wave-making part 130, the cooling liquid can flow and distribute more effectively, reducing the stagnation and waste of the cooling liquid, and reducing the demand for the amount of cooling liquid under the same heat dissipation effect.

[0034] In addition, the rotating shaft 131 is arranged adjacent to the top wall of the box body 110, so that the wave-making part 130 can rotate at a smaller angle when the same heat dissipation effect is required, which can reduce the rotating space required for the rotation of the wave-making part 130 to some extent, so that the structure of the battery pack 100 is more compact. The rotating shaft 131 is arranged adjacent to the top wall of the box body 110, so that the wave-making part 130 is easier to install and disassemble, which is convenient for subsequent maintenance and maintenance work.

[0035] For example, referring to FIG. 2, in the embodiment of the present application, the first direction and the second direction are arranged to be perpendicular in a horizontal plane, so that this design allows the wave-making part 130 to avoid interference with other components inside the box body 110 when rotating, and also avoids occupying too much space.

[0036] It should be noted that in other embodiments, the rotating shaft 131 can also be arranged in the middle of the wave-making plate. For example, the present application does not limit this. In addition, in other embodiments, the first direction and the second direction can also intersect in a vertical plane. For example, the present application does not limit this.

[0037] In some embodiments, the at least one wave-making part 130 is slidingly installed in the battery cavity 111 along the first direction, and the driving mechanism 140 drives the at least one wave-making part 130 to move along the first direction, so that the wave-making part 130 will generate disturbance to the cooling liquid around it. This disturbance will induce the cooling liquid to flow, especially when the wave-making part 130 approaches or moves away from the battery module 120, it will push the cooling liquid to flow around the battery module 120, enhancing the convection of the cooling liquid around the battery module 120, so that the cooling liquid with a high temperature can quickly separate from the battery module 120, and the cooling liquid with a low temperature can quickly contact the battery module 120 without direct contact, thereby helping to break the temperature boundary layer around the battery module 120, ensuring that the low-temperature cooling liquid can contact the surface of the battery cell in time to complete heat exchange, thereby improving the heat exchange efficiency of the cooling liquid and the battery module 120. In addition, the movement of the wave-making part 130 can also cause the cooling liquid to generate vortex and mixing in the local area, and this mixing will mix the cooling liquid with a high temperature with the cooling liquid with a low temperature, thereby reducing the local temperature. This mixing effect helps to reduce the formation of hot spots, improve the uniformity of cooling, and help to reduce the temperature gradient, so that the temperature distribution on the surface of the battery module 120 is more uniform, thereby improving the performance and life of the battery pack 100. When the wave-making part 130 moves, it will constantly destroy and rebuild the cooling liquid boundary layer near the surface of the battery module 120. This destruction and rebuilding process helps to reduce thermal resistance and improve the ability of the cooling liquid to carry away heat from the surface of the battery module 120. This means that under the same heat dissipation requirement, less cooling liquid can be used to achieve the expected heat dissipation effect. In addition, the sliding of the at least one wave-making part 130 along the first direction can cause the liquid surface of the cooling liquid to be lifted, which can increase the contact area between the cooling liquid and the surface of the battery module 120, further enhancing the heat exchange effect, and improving the performance and safety of the battery pack 100. The sliding installation method makes the movement of the wave-making part 130 in the battery cavity 111 more stable and reliable. This design can reduce the risk of damage or failure of the wave-making part 130 caused by mechanical vibration or external force impact, and improve the safety and reliability of the entire battery pack 100.

[0038] It should be noted that the wave-making part 130 and the box body 110 are connected through a sliding structure, which includes a sliding part extending in the first direction and a matching part matched with the sliding part. The sliding part is arranged on the box body 110, and the matching part is arranged on the wave-making part 130. In this way, the sliding structure provides precise guidance for the wave-making part 130 through the sliding part and the matching part extending in the first direction. This ensures that the wave-making part 130 slides along the predetermined path inside the box body 110, thereby ensuring the directionality and effectiveness of the cooling liquid flow. The design of the sliding structure makes the installation and disassembly of the wave-making part 130 more simple. For example, the sliding part can include a sliding groove or a sliding rod, and the matching part can correspondingly include a protrusion and a sliding hole. The specific arrangement of the sliding part and the matching part is not limited in the present application.

[0039] In some embodiments, there is a gap between the wave-making part 130 and the bottom wall of the box body 110. In this way, the gap between the wave-making part 130 and the bottom wall of the box body 110 can reduce the resistance of the wave-making part 130 during movement and reduce noise. In addition, the presence of the gap allows the cooling liquid to flow freely below the wave-making part 130, reducing flow resistance caused by direct contact with the bottom wall. This unobstructed flow path allows the cooling liquid to flow more smoothly, thereby improving heat dissipation efficiency. When the cooling liquid encounters resistance during flow, energy loss occurs. The design of the gap significantly reduces this energy loss, as the cooling liquid can flow more freely, reducing energy consumption due to factors such as friction, turbulence, etc. Since the cooling liquid can flow more smoothly, it can cover the surface of the battery module 120 more effectively and carry away more heat. This helps to improve heat dissipation and ensure that the battery pack 100 operates within the optimal temperature range, thereby prolonging the life of the battery pack 100 and improving the stability of the system. The presence of the gap reduces the stagnation of the cooling liquid near the bottom wall of the box body 110. Cooling liquid stagnation can cause local temperature rise, affecting heat dissipation. The design of the gap helps to ensure uniform distribution of the cooling liquid over the entire surface of the battery module 120, reducing temperature differences.

[0040] In some embodiments, the gap B is in the range of 3mm≤B≤6mm. This range ensures that there is enough space for the coolant to flow underneath the wave-making portion 130, avoiding the restriction of flow due to a too small gap, and also avoiding the reduction of contact area between the wave-making portion 130 and the coolant due to a too large gap. This optimization enables the coolant to cover the battery modules 120 more evenly, improving the heat dissipation effect. Within this gap range, the resistance encountered by the coolant when flowing is moderate, avoiding excessive energy consumption due to too large resistance, and also avoiding reduced heat dissipation effect due to too small resistance. This balance helps to reduce energy loss and improve the efficiency of the heat dissipation system. An appropriate gap B helps to prevent the coolant from stagnating near the bottom wall of the tank 110. Stagnant coolant can cause local temperature rise, affecting the heat dissipation effect. Within this gap range, the coolant can flow smoothly, reducing stagnation.

[0041] More illustratively, the gap between the at least one wave-making portion 130 and the bottom wall of the tank 110 can be 3mm, 3.1mm, 3.2mm, 3.4mm, 3.5mm, 3.6mm, 4mm, 4.1mm, 4.4mm, 4.5mm, 4.7mm, 4.9mm, 5.3mm, 5.5mm, 5.8mm, 6mm, etc. Illustratively, the present application does not limit this.

[0042] Referring to FIGS. 1 and 2, in some embodiments, the tank 110 is further provided with an inlet 112 and an outlet 113. Along the first direction, the inlet 112 and the outlet 113 are respectively arranged on the two sides of the at least one wave-making portion 130. The inlet 112 and the outlet 113 are both in communication with the battery cavity 111. In this way, such a layout can ensure that the coolant forms an effective circulation flow path in the battery cavity 111. The coolant enters from the inlet 112, is pushed by the wave-making portion 130 and exchanges heat with the battery modules 120, and finally flows out from the outlet 113, forming a complete circulation. This flow path can maximize the utilization efficiency of the coolant, ensuring that the battery modules 120 are uniformly cooled. When the coolant circulates in the battery cavity 111, it can carry away the heat generated by the battery modules 120 and be discharged through the outlet 113. Since the inlet 112 and the outlet 113 are respectively arranged on the two sides of the wave-making portion 130, the coolant can cover more surfaces of the battery modules 120 during the flow process, thereby improving the heat dissipation efficiency. This helps to keep the battery modules 120 within the optimal working temperature range and prolong the service life of the battery pack 100. By arranging the inlet 112 and the outlet 113 on the two sides of the wave-making portion 130, it can be ensured that the coolant forms a continuous and stable flow in the battery cavity 111, avoiding the accumulation of heat in a certain area. This design helps to reduce the temperature gradient inside the battery modules 120 and reduce the performance degradation and safety hazards caused by uneven temperature.

[0043] Referring to FIGS. 1 and 4, in some embodiments, the box 110 includes oppositely arranged first and second side walls 114 and 115, each wave-making part 130 is arranged from the first side wall 114 to the second side wall 115 and forms a plurality of accommodation spaces for the battery cavities 111, each of which accommodates a battery module 120, the inlet 112 and the outlet 113 are arranged on the first side wall 114 and communicate with different accommodation spaces, and at least one wave-making part 130 is arranged spaced apart from the second side wall 115 to form a communication port 116 between the at least one wave-making part 130 and the second side wall 115, the communication port 116 communicates between two adjacent accommodation spaces. In this way, the battery cavities 111 are divided into a plurality of accommodation spaces by the wave-making parts 130, each of which accommodates a battery module 120, so that each battery module 120 can be independently cooled. This design can more accurately control the temperature of each battery module 120, preventing performance degradation or safety hazards caused by local overheating. The inlet 112 and the outlet 113 are arranged on the first side wall 114 and communicate with different accommodation spaces, and at least one wave-making part 130 is arranged spaced apart from the second side wall 115 to form a communication port 116, so that two adjacent accommodation spaces can communicate with each other, meaning that the cooling liquid can flow from one accommodation space to another after entering the inlet 112, and then be discharged from the outlet 113, realizing the circulation of the cooling liquid in the battery cavities 111 and improving the heat exchange efficiency between the cooling liquid and the battery modules 120. In addition, this design can promote the flow of cooling liquid between different accommodation spaces, achieve balanced distribution of heat, and avoid overheating or overcooling in a certain area.

[0044] In some embodiments, the inlet 112 and / or the outlet 113 is provided with a solenoid valve arranged to open or close the inlet 112 and / or the outlet 113. In this way, the solenoid valve can accurately open or close the inlet 112 and / or the outlet 113 as needed, thereby achieving precise control of the flow of cooling liquid. This control can be adjusted according to the specific needs and operating state of the battery pack 100 to ensure that the cooling liquid in the battery pack 100 circulates in the best state. By setting the solenoid valve, the inlet 112 and / or the outlet 113 can be quickly closed when an abnormality occurs inside the battery pack 100 or emergency shutdown is required, avoiding safety hazards such as cooling liquid leakage or overheating of the battery pack 100. This helps to protect the safety of the battery pack 100 and its surrounding equipment, reducing potential risks. By precisely controlling the flow of cooling liquid, unnecessary waste and loss can be avoided. For example, when the temperature of the battery pack 100 is low, the flow of cooling liquid can be reduced to reduce energy consumption; when the temperature of the battery pack 100 is high, the flow of cooling liquid can be increased to improve the cooling effect. This adjustment helps to improve the energy efficiency ratio of the battery system and reduce operating costs.

[0045] Referring to FIG. 1, the battery pack 100 further comprises a liquid level sensor 150 installed on the box 110 and configured to detect the liquid level of the cooling liquid. In this way, the liquid level sensor 150 can monitor the liquid level of the cooling liquid in real time, ensuring that the cooling liquid is always maintained at an appropriate level. When the liquid level is below or above the preset safety threshold, the liquid level sensor 150 can trigger a warning system to timely remind the operator to handle, thereby avoiding performance degradation or safety hazards caused by insufficient or excessive cooling liquid. By monitoring the liquid level of the cooling liquid in real time, the battery pack 100 can ensure stable cooling effect under every working condition. This helps to improve the stability and reliability of the battery pack 100 and prolong its service life. The liquid level sensor 150 can help the operator accurately control the amount of added cooling liquid and avoid waste. Through real-time monitoring and warning, the operator can timely discover and solve the abnormal situation of the cooling liquid level, avoiding downtime maintenance due to failure. Abnormal cooling liquid level may cause the battery pack 100 to overheat, damage, or even cause a fire and other safety hazards. The use of the liquid level sensor 150 can timely discover these potential risks and take appropriate measures to handle, thereby ensuring the safe operation of the battery pack 100.

[0046] Referring to FIG. 4, in the embodiments of the present application, the box 110 is further formed with a device cavity 117, the device cavity 117 is communicated with the battery cavity 111 through a mounting hole, and the driving mechanism 140 is at least partially installed in the device cavity 117. The driving mechanism 140 is drivingly connected with at least one wave-making part 130 through the mounting hole. In this way, without affecting the heat dissipation and performance of the battery module 120, a suitable installation space is provided for the driving mechanism 140, the overall integration of the box 110 is improved, and the design not only realizes the protection of the driving mechanism 140, but also makes the installation, debugging and maintenance operation of the driving mechanism 140 convenient. In addition, the battery pack 100 can also have an attractive structure. Although the driving mechanism 140 will generate a certain amount of heat, since it is installed in the device cavity 117 and is relatively independent of the battery cavity 111, the negative impact on the heat dissipation of the battery module 120 is avoided.

[0047] In some embodiments, referring to FIG. 1 and FIG. 5, the box 110 is further provided with an exhaust port 118, which is communicated with the battery cavity 111. In this way, the battery pack 100 will generate heat during operation, causing the internal pressure of the box 110 to rise. The exhaust port 118 can timely exhaust these gases to prevent the internal pressure of the box 110 from being too high to damage the battery module 120.

[0048] It should be noted that the setting position of the exhaust port 118 is various, for example, in some embodiments, the exhaust port 118 is arranged on the side wall of the box body 110, and in the embodiments of the present application, the exhaust port 118 is arranged on the top of the box body 110, so that according to the principle of hot air rising, arranging the exhaust port 118 on the top of the box body 110 can more effectively exhaust the hot air in the box body 110. This helps to reduce the temperature in the battery cavity 111 and ensure that the battery module 120 works in an appropriate temperature range. In addition, since there is cooling liquid inside the battery cavity 111, arranging the exhaust port 118 on the top can prevent the cooling liquid from overflowing during the exhaust process. Arranging the exhaust port 118 on the top can simplify the installation and maintenance process. The exhaust port 118 is provided with an exhaust valve, so that the opening and closing of the exhaust port 118 can be accurately controlled, and adjusted according to the pressure and temperature conditions inside the box body 110. Such accurate control helps to maintain the stability of the internal environment of the box body 110 and ensures that the battery module 120 works in the best state. The design of the exhaust valve can prevent gas from flowing back into the box body 110 and avoid damaging the battery module 120. By adjusting the opening degree of the exhaust valve, the noise and vibration generated during the exhaust process can be reduced. This is of great significance to improve the operation stability of the battery pack 100 and reduce noise pollution.

[0049] Referring to FIGS. 1, 5 and 6, in some embodiments, the box body 110 includes a base 101 and a cover 102, which together enclose the battery cavity 111, wherein the base 101 and the cover 102 are detachably connected, so that the installation and disassembly process of the battery module 120 becomes simple and fast. Such a design can significantly improve work efficiency during the production, maintenance and replacement of the battery pack 100. When the battery pack 100 needs to be repaired or maintained, the cover 102 can be easily disassembled to directly access the components inside the battery cavity 111. This can facilitate the inspection, cleaning or replacement of key components such as the battery module 120, thereby prolonging the service life of the battery pack 100.

[0050] It should be noted that there are various ways to achieve detachable connection of the base 101 and the cover 102, for example, the base 101 and the cover 102 can be threadedly connected or flange connected, etc. Exemplarily, the present application does not limit this.

[0051] Exemplarily, a sealing ring 103 is further arranged between the base 101 and the cover 102, and sealingly abuts the base 101 and the cover 102 respectively. In this way, the arrangement of the sealing ring 103 can prevent leakage of the cooling liquid. In addition, the sealing effect of the sealing ring 103 can ensure the stability of the internal environment of the battery pack 100, thereby maintaining the performance stability of the battery module 120. Since the sealing effect of the sealing ring 103 can effectively prevent leakage of the cooling liquid, the frequency of maintenance and replacement of the battery pack 100 can be reduced, thereby reducing the maintenance cost.

[0052] The embodiments of the present application also provide a power-using device, which comprises the battery pack 100. The specific structure of the battery pack 100 is referred to the embodiments. Since the power-using device adopts all the technical solutions of all the embodiments, it at least has all the beneficial effects brought by the technical solutions of the embodiments, which will not be repeated here.

Claims

1. A battery pack (100) comprising: a box (110) formed with a battery cavity (111) in which a cooling liquid is stored; at least two battery modules (120) mounted in the battery cavity (111) and spaced apart along a first direction; and at least one wave-making part (130) each of which is located between two adjacent battery modules (120) and movably mounted in the battery cavity (111) ; a driving mechanism (140) configured to drive the wave-making part (130) to move at least a portion of the wave-making part (130) to be close to or away from one of the two adjacent battery modules (120). One end of at least one wave-making part (130) is rotatably mounted in the battery cavity (111) about an axis extending along a second direction, so that a portion of each wave-making part (130) is adapted to be close to or away from one of the two adjacent battery modules (120), and the second direction is arranged transversely to the first direction.

2. The battery pack (100) of claim 1, wherein, The first direction and the second direction are arranged transversely in a horizontal plane.

3. The battery pack (100) of claim 2, wherein, The wave-making part (130) is arranged in a plate shape and extends along the second direction. The first direction and the second direction are arranged transversely in a horizontal plane.

4. The battery pack (100) according to claim 2 or 3, wherein The other end of at least one wave-making part (130) is rotatably connected to the box (110) through a rotating shaft (131), the rotating shaft (131) extends along the second direction, and the rotating shaft (131) is arranged adjacent to the top wall of the box (110). The first direction and the second direction are arranged perpendicularly in a horizontal plane.

5. The battery pack (100) according to any one of claims 2 to 4, wherein, At least one wave-making part (130) is slidably mounted in the battery cavity (111) along the first direction, and the driving mechanism (140) drives at least one wave-making part (130) to move along the first direction.

6. The battery pack (100) according to any one of claims 1 to 5, wherein The wave-making part (130) and the box (110) are connected through a sliding structure, the sliding structure comprises a sliding part extending along the first direction and a matching part adapted to the sliding part, the sliding part is arranged on the box (110), and the matching part is arranged on the wave-making part (130).

7. The battery pack (100) of claim 6, wherein, At least one wave-making part (130) has a gap with the bottom wall of the box (110).

8. The battery pack (100) according to any one of claims 1 to 7, wherein The gap is B, wherein 3mm≤B≤6mm.

9. The battery pack (100) of claim 8, wherein, The box (110) is further provided with a liquid inlet (112) and a liquid outlet (113), along the first direction, the liquid inlet (112) and the liquid outlet (113) are arranged on both sides of at least one wave-making part (130), and the liquid inlet (112) and the liquid outlet (113) are in communication with the battery cavity (111).

10. The battery pack (100) according to any one of claims 1 to 9, wherein ​ 11. The battery pack (100) of claim 10, wherein, The box (110) comprises a first side wall (114) and a second side wall (115) oppositely arranged, each of the wave-making parts (130) is arranged from the first side wall (114) to the second side wall (115) and forms a plurality of accommodating spaces for the battery modules (120) with the battery cavity (111); The liquid inlet (112) and the liquid outlet (113) are arranged on the first side wall (114), and the liquid inlet (112) and the liquid outlet (113) are communicated with different accommodating spaces; At least one of the wave-making parts (130) is arranged spaced apart from the second side wall (115) to form a communication port (116) between the at least one wave-making part (130) and the second side wall (115), and the communication port (116) is communicated between two adjacent accommodating spaces.

12. The battery pack (100) according to claim 10 or 11, wherein The liquid inlet (112) and / or the liquid outlet (113) are provided with a solenoid valve arranged to open or close the liquid inlet (112) and / or the liquid outlet (113).

13. The battery pack (100) according to any one of claims 1 to 12, further comprising a liquid level sensor (150) mounted on the box (110), the liquid level sensor (150) being configured to detect the liquid level of the cooling liquid.

14. The battery pack (100) according to any one of claims 1 to 13, wherein, The box (110) is further formed with a device cavity (117) communicated with the battery cavity (111) through a mounting hole, and the driving mechanism (140) is at least partially mounted in the device cavity (117), and the driving mechanism (140) is drivingly connected with at least one of the wave-making parts (130) through the mounting hole.

15. The battery pack (100) according to any one of claims 1 to 14, wherein, The box (110) is further provided with an exhaust port (118) communicated with the battery cavity (111).

16. The battery pack (100) according to any one of claims 1 to 15, wherein The box (110) comprises a base (101) and a cover (102), and the base (101) and the cover (102) jointly enclose the battery cavity (111), wherein the base (101) and the cover (102) are detachably connected.

17. The battery pack (100) of claim 16, wherein, The base (101) and the cover (102) are further provided with a sealing ring (103) sealingly abutting with each other.

18. An electrical equipment comprising the battery pack (100) according to any one of claims 1 to 17.

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