Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, and relates to the technical field of batteries, on one hand, the battery pack comprises a box body, a battery cell module, a bottom liquid cooling plate and at least two side liquid cooling plates. The box body has an accommodating cavity. And the battery cell module is mounted in the accommodating cavity. The bottom liquid cooling plate is arranged at the bottom of the battery cell module and is used for cooling the bottom of the battery cell module. The at least two side surface liquid cooling plates are arranged on the side surfaces of the battery cell modules, the side surface liquid cooling plates are used for dissipating heat of the side surfaces of the battery cell modules, and every two adjacent side surface liquid cooling plates are arranged in a mirror symmetry manner. The bottom liquid cooling plate is fixedly connected with the side liquid cooling plates, and all the side liquid cooling plates are connected to the bottom liquid cooling plate in parallel. According to the invention, all the side liquid cooling plates can be arranged to be connected to the bottom liquid cooling plate in parallel, so that the flow resistance can be effectively reduced, the cooling liquid is ensured to flow among the liquid cooling plates, and an efficient heat dissipation effect is realized.

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] In related technical fields, the lifespan and charge / discharge rate of power batteries and energy storage batteries are largely constrained by the battery's own high-temperature conditions. Currently, the demand for high heat dissipation efficiency in batteries poses a severe challenge to the cooling system design at the bottom of the battery.

[0003] To improve the fast charging capability of electric vehicles, reduce the risk of battery pack thermal runaway, and extend battery life, battery cooling technology has developed a variety of multi-faceted cooling solutions.

[0004] However, existing multi-faceted cooling solutions often result in significant flow resistance, thus limiting further improvements in cooling efficiency. Utility Model Content

[0005] This application provides a battery pack and electrical device that enables all side liquid cooling plates to be connected in parallel to the bottom liquid cooling plate, thereby effectively reducing flow resistance and ensuring the flow of coolant between the liquid cooling plates, thus achieving a high-efficiency heat dissipation effect.

[0006] In one aspect, this application provides a battery pack, which includes a housing, a cell module, a bottom liquid cooling plate, and at least two side liquid cooling plates.

[0007] The enclosure has a receiving cavity. The battery cell module is installed inside the receiving cavity. A bottom liquid cooling plate is located at the bottom of the battery cell module to dissipate heat from the bottom of the battery cell module.

[0008] At least two side liquid cooling plates are set on the side of the cell module. The side liquid cooling plates are used to dissipate heat from the side of the cell module. Adjacent side liquid cooling plates are arranged in a mirror-symmetrical manner.

[0009] The bottom liquid cooling plate is fixedly connected to the side liquid cooling plates, and all the side liquid cooling plates are connected in parallel to the bottom liquid cooling plate.

[0010] The casing has an internal cavity for housing the battery cell modules, which are installed within this cavity to ensure their stability and safety. To effectively control the heat generated by the battery cell modules during operation, a bottom liquid cooling plate is installed at the bottom of the modules. The main function of the bottom liquid cooling plate is to effectively dissipate heat from the bottom of the battery cell modules, ensuring that the battery pack will not suffer from overheating that could affect its performance or safety during prolonged operation.

[0011] In addition to the bottom liquid cooling plate, this application also includes at least two side liquid cooling plates, which are installed on both sides of the cell module. The main function of the side liquid cooling plates is to dissipate heat from the sides of the cell module, thereby further improving the overall heat dissipation effect of the battery pack. To achieve optimal heat dissipation, adjacent side liquid cooling plates are arranged in a mirror-symmetrical structure, which ensures that heat is evenly dissipated from both sides of the cell module. The assembly positions of the two side liquid cooling plates are also mirror-symmetrical.

[0012] Furthermore, to ensure the efficient operation of the entire cooling system, the bottom liquid cooling plate and the side liquid cooling plates are tightly connected together using a fixed connection. All side liquid cooling plates are configured to connect to the bottom liquid cooling plate in parallel, ensuring the flow of coolant between the plates and achieving efficient heat dissipation. Moreover, the parallel connection effectively reduces flow resistance, further guaranteeing heat dissipation efficiency.

[0013] This design allows the battery pack to maintain good heat dissipation performance in various operating environments, ensuring battery stability and extending its lifespan.

[0014] The principle behind the parallel connection of pipes in the above structure to reduce flow resistance is that when fluid flows through multiple parallel pipes, the total flow cross-sectional area increases, thereby reducing the fluid velocity. This reduced velocity leads to decreased flow resistance, as flow resistance is proportional to the square of the velocity. This reduces pressure loss in the pipes, contributing to improved heat dissipation efficiency of the entire system.

[0015] In some examples, side liquid cooling plates are provided on both sides of the battery cell module, and at least two battery cell modules are arranged side by side to form a combined module, in which adjacent battery cell modules share a side liquid cooling plate.

[0016] The flow rate in the shared side liquid cooling plate of the merged modules is greater than the flow rate in the non-shared side liquid cooling plates. Alternatively, the flow rate in the side liquid cooling plates is adjustable. Or, the flow rate of the side liquid cooling plates can be adjusted to a preset flow rate and marked during the production process.

[0017] In some specific embodiments, each cell module is equipped with side liquid cooling plates on both sides. These cell modules are arranged side by side to form a combined module. In the combined module, two adjacent cell modules share a single side liquid cooling plate. This arrangement can greatly save space and avoid unnecessary waste.

[0018] Specifically, the coolant flow rate in these shared side liquid cooling plates is higher than that in the non-shared side liquid cooling plates. This is because the shared liquid cooling plates need to cool two cell modules, thus requiring a higher flow rate to ensure sufficient cooling effect. In this way, the temperature of each cell module can be effectively controlled, thereby improving the overall performance and lifespan of the battery.

[0019] In some examples, each merged module contains three battery cell modules connected in parallel, which are adapted to four side liquid cooling plates.

[0020] The three battery cell modules include a first module, a second module, and a third module, and the four side liquid cooling plates include a first liquid cooling plate, a second liquid cooling plate, a third liquid cooling plate, and a fourth liquid cooling plate.

[0021] The first module has a first liquid cooling plate and a second liquid cooling plate on each side. The second module has a second liquid cooling plate and a third liquid cooling plate on each side. The first module and the second module share the second liquid cooling plate. The third module has a third liquid cooling plate and a fourth liquid cooling plate on each side. The second module and the third module share the third liquid cooling plate.

[0022] The first liquid cooling plate and the second liquid cooling plate are symmetrically arranged with respect to the first module, the second liquid cooling plate and the third liquid cooling plate are symmetrically arranged with respect to the second module, and the third liquid cooling plate and the fourth liquid cooling plate are symmetrically arranged with respect to the third module.

[0023] The above-described exemplary configuration includes a combined module, in which each combined module contains three battery cell modules connected in series or parallel. These three battery cell modules are adapted to four side liquid cooling plates. The three battery cell modules are referred to as the first module, the second module, and the third module, respectively, while the four side liquid cooling plates are referred to as the first liquid cooling plate, the second liquid cooling plate, the third liquid cooling plate, and the fourth liquid cooling plate, respectively.

[0024] Specifically, the first module is equipped with a first liquid cooling plate and a second liquid cooling plate on each side, while the second module is equipped with a second liquid cooling plate and a third liquid cooling plate on each side. It is worth noting that the first and second modules share the same second liquid cooling plate. As for the third module, it is equipped with a third liquid cooling plate and a fourth liquid cooling plate on each side, while the second and third modules share the same third liquid cooling plate.

[0025] In these configurations, the first and second liquid cooling plates are symmetrically arranged relative to the first module, meaning they are arranged symmetrically on both sides of the first module. Similarly, the second and third liquid cooling plates are also symmetrically arranged relative to the second module, indicating they are arranged symmetrically on both sides of the second module. Finally, the third and fourth liquid cooling plates are also symmetrically arranged relative to the third module, meaning they are arranged symmetrically on both sides of the third module.

[0026] In some examples, the bottom of the merged module is provided with a bottom liquid cooling plate, and the first, second, third and fourth liquid cooling plates are all connected in parallel to the bottom liquid cooling plate.

[0027] The ends of the first liquid cooling plate and the second liquid cooling plate are connected in parallel through parallel pipes, and the ends of the third liquid cooling plate and the fourth liquid cooling plate are connected in parallel through parallel pipes.

[0028] A bottom liquid cooling plate is installed at the bottom of the combined module, and the first, second, third, and fourth liquid cooling plates are all connected to this bottom liquid cooling plate in parallel. Specifically, one end of the first liquid cooling plate is connected to one end of the second liquid cooling plate through parallel piping, forming a parallel connection. Similarly, one end of the third liquid cooling plate is also connected to one end of the fourth liquid cooling plate through parallel piping, forming another parallel connection. This arrangement ensures that the coolant flows between the liquid cooling plates, thereby improving the overall cooling efficiency.

[0029] Since each side liquid cooling plate includes a side plate inlet and a side plate outlet, the parallel piping also appears in pairs. That is, taking the parallel connection of the first liquid cooling plate and the second liquid cooling plate as an example, the side plate inlets of the first liquid cooling plate and the second liquid cooling plate are first connected by piping, the two piping are connected and combined into one, and then connected in parallel with the bottom liquid cooling plate through a metal water nozzle welded to the bottom liquid cooling plate; similarly, the side plate outlets of the first liquid cooling plate and the second liquid cooling plate are first connected by piping, the two piping are connected and combined into one, and then connected in parallel with the bottom liquid cooling plate through a metal water nozzle welded to the bottom liquid cooling plate.

[0030] In some examples, the bottom liquid cooling plate and the side liquid cooling plate are arranged in a serpentine pattern with at least two parallel flow channels.

[0031] The coolant flow paths within the bottom and side liquid cooling plates are arranged in at least two parallel serpentine patterns. This configuration allows the coolant to more effectively cover the entire surface of the cooling plates during flow, resulting in better heat dissipation. Even in extreme cases where a single flow path becomes blocked, the overall heat dissipation performance is not significantly affected because the other flow paths remain unobstructed, thus ensuring stable system operation and continuous cooling of the equipment. This design not only improves heat dissipation efficiency but also enhances system reliability, ensuring good heat dissipation performance under various operating environments.

[0032] In some examples, the liquid inlet of the side liquid cooling plate is located above the liquid outlet of the side liquid cooling plate, and the direction above is the opposite of the bottom liquid cooling plate of the side liquid cooling plate.

[0033] The side plate inlet is located above the inlet area inside the corresponding flow channel, and the side plate outlet is located above the outlet area inside the corresponding flow channel.

[0034] In some specific embodiments, the side plate inlet of the side liquid cooling plate is positioned above the side plate outlet. This arrangement ensures that after the liquid enters through the side plate inlet, it can flow smoothly along the internal flow channels of the side liquid cooling plate and finally exit through the side plate outlet. Furthermore, this arrangement keeps the upper portion of the side liquid cooling plate away from the bottom liquid cooling plate, thus providing sufficient space and a smooth path for liquid flow.

[0035] In some examples, at least two cell modules are arranged side by side to form a merged module, in which adjacent cell modules share a side liquid cooling plate.

[0036] There are at least two merging modules, with adjacent merging modules spaced apart within the receiving cavity. The merging modules can be disassembled and replaced relative to the entire housing.

[0037] At least two cell modules are arranged side-by-side to form a combined module. In this combined module, adjacent cell modules share a single side liquid cooling plate. This arrangement not only saves space but also improves cooling efficiency.

[0038] The battery system incorporates at least two modules. These modules are spaced apart within the housing for easy maintenance and replacement. Each module can be independently removed and installed from the housing, significantly simplifying maintenance and improving system maintainability. This modular design makes the entire battery system more flexible and reliable.

[0039] In some examples, an adhesive limiting strip is provided between the side liquid cooling plate and the battery cell module. The adhesive limiting strip is used to limit the gap between the side liquid cooling plate and the battery cell module and to ensure that the gap error at different positions is lower than a preset value. The gap is filled with thermally conductive structural adhesive.

[0040] The adhesive limiting strip is used to ensure the heat dissipation effect and overall structural stability of the battery module, and to further optimize the contact between the side liquid cooling plate and the cell module, ensuring that the gap between them is uniform and the error is controlled within a preset range. The function of this adhesive limiting strip is to restrict and fix the gap between the liquid cooling plate and the cell module, ensuring that the gap error at different positions is below a preset value, thereby guaranteeing the heat dissipation performance and structural stability of the entire battery module. To further improve heat dissipation efficiency, thermally conductive structural adhesive is filled into the gap. This structural adhesive not only has good thermal conductivity but also serves to fix and seal, ensuring tight contact between the liquid cooling plate and the cell module.

[0041] After the side liquid cooling plate and the side of the module are connected with thermally conductive structural adhesive, they are rigidly fixed with bolts and mounting brackets to prevent displacement of the side liquid cooling plate when multiple rows of modules are hoisted.

[0042] In some examples, the gap size is 'a', where 0.5mm ≤ a ≤ 5mm. The thickness of the thermally conductive structural adhesive is 'b', where 0.5mm ≤ b ≤ 5mm, and the thickness of the thermally conductive structural adhesive is matched to the gap size.

[0043] The gap dimension between the liquid cooling plates is set to 'a', with a value between 0.5 mm and 5 mm. This setting ensures proper dimensional accuracy between the liquid cooling plates to meet heat dissipation and structural strength requirements. Simultaneously, the thickness of the thermally conductive structural adhesive is set to 'b', also between 0.5 mm and 5 mm. The function of the thermally conductive structural adhesive is to fill the gap between the liquid cooling plates to ensure good heat conduction. To ensure that the thermally conductive structural adhesive can effectively fill the gap and perform its thermal conductivity function, its thickness is matched to the gap dimension, thereby ensuring tight contact and good thermal conductivity between the liquid cooling plates.

[0044] Secondly, this application provides an electrical device, including the aforementioned battery pack and housing, with the battery pack disposed within the housing.

[0045] Electrical devices equipped with the battery pack described in this application can have all side liquid cooling plates connected in parallel to the bottom liquid cooling plate, thereby effectively reducing flow resistance and ensuring the flow of coolant between the various liquid cooling plates, thus achieving a highly efficient heat dissipation effect. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the examples or prior art description will be briefly introduced below. Obviously, the drawings described below are only some examples of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the structure of a battery pack with two merged modules hidden in the housing, as shown in one example of this application.

[0048] Figure 2 This is a schematic diagram of the structure of the side liquid cooling plate of the battery pack after an explosion, as shown in one example of this application.

[0049] Figure 3 This is a schematic diagram of the bottom liquid cooling plate in a battery pack in one example of this application.

[0050] Figure 4 This is a cross-sectional view of the bottom liquid cooling plate in a battery pack, as shown in one example of this application.

[0051] Figure 5 This is a schematic diagram of the side liquid cooling plate in a battery pack of one example of this application.

[0052] Figure 6 This is a cross-sectional view of the side liquid cooling plate in a battery pack, as shown in one example of this application.

[0053] Figure 7 for Figure 6 The diagram at point A shows a partially enlarged view of the alignment of the side plate inlet, outlet, and flow channel.

[0054] Figure 8 This is a schematic diagram of the battery pack structure in one example of this application after the casing and some of the cell modules are hidden.

[0055] Figure 9 This is a schematic diagram of the battery pack structure in one example of this application after the casing and all cell modules are hidden.

[0056] Figure 10 This is a schematic diagram of the structure in one example of this application when the bottom liquid cooling plate and the side liquid cooling plate are connected by parallel pipes.

[0057] Figure 11 This is a schematic diagram of the structure in one example of this application, showing the bottom liquid cooling plate and the side liquid cooling plate connected by parallel pipes, with part of the side liquid cooling plate hidden.

[0058] Figure label:

[0059] 1000, Combined Module; 1001, First Module; 1002, Second Module; 1003, Third Module; 1004, First Liquid Cooling Plate; 1005, Second Liquid Cooling Plate; 1006, Third Liquid Cooling Plate; 1007, Fourth Liquid Cooling Plate; 1100, First Combined Module; 1200, Second Combined Module; 200, Cell Module; 300, Bottom Liquid Cooling Plate; 310, Bottom Plate Liquid Inlet; 320, Bottom Plate Liquid Outlet; 330, Bottom Plate Flow Channel; 340, Parallel Liquid Inlet; 350, Parallel Liquid Return Port; 400, Side Liquid Cooling Plate; 410, Side Plate Liquid Inlet; 420, Side Plate Liquid Outlet; 430, Side Plate Flow Channel; 500, Parallel Piping; 600, Mounting Bracket. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and examples. It should be understood that the specific examples described herein are merely illustrative and not intended to limit the scope of this application.

[0061] In the current technological field, the lifespan and charge / discharge rate of power batteries and energy storage batteries are largely limited by the high temperatures of the batteries themselves. To address this challenge, bottom-cooling solutions for batteries face significant hurdles. To improve the fast-charging capability of electric vehicles, reduce the risk of battery pack thermal runaway, and extend battery life, battery cooling technology has developed a multi-faceted cooling solution. This solution distributes coolant from the main parallel pipeline to the side liquid cooling plates through a water distribution box and a shunt. However, this solution also introduces some problems.

[0062] First, the water distribution box occupies a large space, and the welding connection between the water distribution box and the casing is complex, requiring a high degree of sealing. This makes the manufacturing process of the battery pack's lower casing more challenging. Second, the side inlet / outlet parallel piping assembly and the branch parallel piping occupy a large space and have a complex structure. High precision is required during the battery pack module installation and water pipe assembly. Furthermore, the numerous water pipe joints pose a greater challenge to the system's stability.

[0063] Placing two liquid cooling plates between adjacent modules can improve cooling efficiency, but it is costly and increases the number of water pipe joints. This leads to reduced space utilization and increased flow resistance. The overall series structure of the side cooling plates results in high overall flow resistance, which may lead to a lower side flow distribution ratio, thus failing to fully utilize the three-sided cooling effect.

[0064] In the side-mounted cold plate series structure, the heat exchange efficiency decreases along the flow path, resulting in an excessive temperature difference between the coolant at the inlet and outlet of the side-mounted cold plate. This may lead to inconsistent cooling or heating effects on the battery cells on both sides, resulting in a large overall temperature difference in the battery pack. Finally, placing the inlet and outlet of the side-mounted liquid cooling plate directly on the bottom liquid cooling plate reduces the number of water pipes, but the water pipe arrangement occupies space in the middle area, affecting the layout of the high and low voltage wiring harnesses and control modules in the battery pack.

[0065] To solve the above technical problems, please refer to Figures 1-11 As shown, the first aspect of this application proposes a battery pack in which all side liquid cooling plates 400 are configured to be connected in parallel to the bottom liquid cooling plate 300, thereby effectively reducing flow resistance and ensuring the flow of coolant between the liquid cooling plates, thus achieving a high-efficiency heat dissipation effect.

[0066] Reference Figure 1 and Figure 2 In some examples, this application provides a battery pack including a housing, a cell module 200, a bottom liquid cooling plate 300, and at least two side liquid cooling plates 400.

[0067] The housing has a receiving cavity. The battery cell module 200 is installed in the receiving cavity. A bottom liquid cooling plate 300 is disposed at the bottom of the battery cell module 200, and the bottom liquid cooling plate 300 is used to dissipate heat from the bottom of the battery cell module 200.

[0068] At least two side liquid cooling plates 400 are disposed on the side of the cell module 200, and the side liquid cooling plates 400 are used to dissipate heat from the side of the cell module 200.

[0069] The bottom liquid cooling plate 300 is fixedly connected to the side liquid cooling plates 400, and all the side liquid cooling plates 400 are connected in parallel to the bottom liquid cooling plate 300. This combination of liquid cooling plates improves the overall heat dissipation efficiency of the battery pack, thereby increasing its charging power and further improving charging efficiency, achieving fast charging. Specifically, the parallel connection effectively reduces the flow resistance of the corresponding coolant.

[0070] Specifically, the housing has an internal cavity for housing the battery cell module 200. The battery cell module 200 is installed within the cavity to ensure its stability and safety. To effectively control the heat generated by the battery cell module 200 during operation, a bottom liquid cooling plate 300 is installed at the bottom of the battery cell module 200. The main function of the bottom liquid cooling plate 300 is to effectively dissipate heat from the bottom of the battery cell module 200, ensuring that the battery pack will not be affected by overheating during long-term operation, thus preventing any impact on performance or safety.

[0071] In addition to the bottom liquid cooling plate 300, this application also includes at least two side liquid cooling plates 400, which are mounted on both sides of the cell module 200. The main function of the side liquid cooling plates 400 is to dissipate heat from the sides of the cell module 200, thereby further improving the overall heat dissipation effect of the battery pack. To achieve optimal heat dissipation, the mounting positions of the two side liquid cooling plates 400 are also mirrored.

[0072] Furthermore, to ensure the efficient operation of the entire heat dissipation system, the bottom liquid cooling plate 300 and the side liquid cooling plates 400 are tightly connected together by a fixed connection. All side liquid cooling plates 400 are configured to connect in parallel to the bottom liquid cooling plate 300, which ensures the flow of coolant between the liquid cooling plates, thereby achieving a highly efficient heat dissipation effect. Moreover, the parallel connection effectively reduces flow resistance, further guaranteeing heat dissipation efficiency. With this configuration, the battery pack can maintain good heat dissipation performance under various operating environments, ensuring battery stability and extending its service life.

[0073] The principle behind the parallel connection of pipes in the above structure to reduce flow resistance is that when fluid flows through multiple parallel pipes, the total flow cross-sectional area increases, thereby reducing the fluid velocity. This reduced velocity leads to decreased flow resistance, as flow resistance is proportional to the square of the velocity. This reduces pressure loss in the pipes, contributing to improved heat dissipation efficiency of the entire system.

[0074] In this application, the parallel connection mentioned in relation to the liquid cooling plate specifically refers to the parallel connection method between various pipes (or the combination of flow channels and pipes), not the parallel connection between circuits. In other words, we are discussing the parallel configuration of various cooling pipes in the liquid cooling system, not the circuit connection method between battery cells. As for the parallel connection between different cells, it actually refers to the parallel connection of cells in the circuit, and these are completely different concepts.

[0075] In this application, the parallel design of the liquid cooling plates is to optimize the flow path of the coolant, thereby improving heat dissipation efficiency. This arrangement allows the coolant to be distributed among multiple liquid cooling plates, ensuring that each cell is effectively cooled. The parallel connection between circuits, on the other hand, is to increase the total output current of the battery pack. Although the two are similar in name, their purposes and mechanisms are completely different.

[0076] The two adjacent side liquid cooling plates 400 are arranged in a mirror symmetrical manner. This ensures that heat is evenly dissipated from both sides of the cell module 200. For example, the two sides of the cell module 200 are provided with side liquid cooling plates 400, and the two side liquid cooling plates 400 are mirror symmetrical with respect to the cell module 200.

[0077] Mirror symmetry refers to the mutual mapping of two parts in shape and structure, like a reflection in a mirror. The cell module 200 has a plane of symmetry located in the central region. The purpose of this plane of symmetry is to ensure that the two sides of the module are structurally identical, like a reflection in a mirror. Specifically, the two side liquid cooling plates 400 are placed on opposite sides of the module, and the mounting holes on the two side liquid cooling plates 400 are also designed to be symmetrical. If the module is separated from the central plane of symmetry, each side of the liquid cooling plate will appear as a mirror image of the other. Furthermore, to ensure precise symmetry of the mounting hole positions, recesses are specially designed on the liquid cooling plates, and the positions of these recesses are also mirror-symmetrical with respect to the plane of symmetry. These recesses are recessed portions designed on the liquid cooling plates to serve as positioning references when assembling the mounting bracket 600.

[0078] The enclosure and the cell module 200 can be assembled in various ways. That is, the cell module 200 can be installed upside down inside the enclosure, or it can be installed normally. When installed upside down, the electrode posts of the assembled cell module 200 face downwards. When assembled normally, the electrode posts of the assembled cell module 200 face upwards.

[0079] The bottom liquid cooling plate 300 in this application is provided with a bottom plate inlet 310 and a bottom plate outlet 320, which can be equipped with a detachable water nozzle structure. The bottom liquid cooling plate 300 is provided with a bottom plate flow channel 330 of a certain shape. The bottom liquid cooling plate 300 is also provided with a parallel liquid inlet 340 and a parallel liquid return outlet 350 opposite to the side liquid cooling plates 400. The side liquid cooling plates 400 can be combined in pairs. In the side liquid cooling plates 400, the two side plate inlets 410 can be connected in parallel and then combined into one, and then connected in parallel to the parallel liquid inlet 340 on the bottom liquid cooling plate 300. The two side plate outlets 420 can also be connected in parallel and combined into one, and then connected in parallel to the parallel liquid return outlet 350 on the bottom liquid cooling plate 300. The parallel liquid inlet 340 and the parallel liquid return outlet 350 are located in the upstream area of ​​the bottom liquid cooling plate 300.

[0080] Reference Figure 1 and Figure 2 In some examples, side liquid cooling plates 400 are provided on both sides of the cell module 200, and at least two cell modules 200 are arranged side by side to form a combined module 1000, in which two adjacent cell modules 200 in the combined module 1000 share a side liquid cooling plate 400.

[0081] In some specific embodiments, each cell module 200 is equipped with side liquid cooling plates 400 on both sides. These cell modules 200 are arranged side by side to form a combined module 1000. In the combined module 1000, two adjacent cell modules 200 share a single side liquid cooling plate 400. This arrangement can greatly save space and avoid unnecessary waste.

[0082] Each of the battery cell modules 200 has a side liquid cooling plate 400 on both sides. At least two side liquid cooling plates 400 are connected in parallel through a parallel pipeline 500 to form a parallel liquid inlet connector and a parallel liquid return connector. The parallel liquid inlet connector is connected to the parallel liquid inlet 340 on the bottom liquid cooling plate 300, and the parallel liquid return connector is connected to the parallel liquid return outlet 350 on the bottom liquid cooling plate 300.

[0083] In the above structure, at least two side liquid cooling plates 400 are interconnected via parallel pipes 500, forming a preliminary parallel structure. This parallel structure creates two parallel connectors: a parallel inlet connector and a parallel return connector. The parallel inlet connector is formed by combining the side plate inlets 410 of all connected side liquid cooling plates 400, and the parallel return connector is formed by combining the side plate outlets 420 of all connected side liquid cooling plates 400. Each side liquid cooling plate 400 is connected to a parallel inlet 340 on the bottom liquid cooling plate 300 via a parallel inlet connector, and simultaneously connected to a parallel return port 350 on the bottom liquid cooling plate 300 via a parallel return connector. This design ensures that coolant can be distributed among the various side liquid cooling plates 400, thereby improving the cooling efficiency of the entire cell module 200.

[0084] The flow rate in the shared side liquid cooling plate 400 of the combined module 1000 is greater than the flow rate in the non-shared side liquid cooling plate 400. Alternatively, the flow rate in the side liquid cooling plate 400 is adjustable. Alternatively, the flow rate of the side liquid cooling plate 400 can be adjusted to a preset flow rate and marked during the production process.

[0085] Specifically, the coolant flow rate in these shared side liquid cooling plates 400 is greater than that in the non-shared side liquid cooling plates 400. This is because the shared liquid cooling plates need to provide cooling for two cell modules 200, thus requiring a higher flow rate to ensure sufficient cooling effect. In this way, the temperature of each cell module 200 can be effectively controlled, thereby improving the overall performance and lifespan of the battery.

[0086] Furthermore, the coolant flow rate within the side liquid cooling plate 400 is adjustable. This allows for flexible adjustment of the coolant flow rate according to different operating conditions and ambient temperatures to achieve optimal cooling performance. The aforementioned adjustments are made before assembly or during processing of the side liquid cooling plate 400, resulting in side liquid cooling plates 400 with varying flow rate (flow resistance) parameters. The appropriate side liquid cooling plate 400 can be installed in the desired position as needed.

[0087] This adjustment function can also be applied by setting up certain moving mechanisms or adjustable valves, which can be completed automatically by the control system or manually adjusted by the operator.

[0088] During the battery module manufacturing process, the flow rate of the side liquid cooling plate 400 can be adjusted to a preset level, and this setting value is recorded. The main purpose of this is to ensure that each cell module 200 receives the same cooling effect during production. By ensuring uniform cooling for each cell module, battery consistency and reliability can be improved. This method of adjusting and recording flow rate ensures that each battery module meets predetermined performance requirements before leaving the factory, thus providing end users with a more stable and reliable product.

[0089] Reference Figures 3 to 6 During the molding process, the side liquid cooling plate 400 forms a unidirectional open cavity with a flow channel inside. To control the liquid flow, a plug can be installed at the opening; a plug is a structural component that seals the opening. By changing the installation position of the plug, the flow rate inside the side liquid cooling plate can be adjusted. This adjustment is mainly achieved by changing the resistance of the fluid within the flow channel. Once the plug is welded and fixed in a specific position, the flow rate parameters are determined and cannot be arbitrarily changed.

[0090] In other words, the opening can be sealed by a plug or other structure. By determining the location of the plug, the flow rate within the side liquid cooling plate 400 can be altered. The change in flow rate is mainly reflected in the change of flow resistance within the flow channel. The plug is usually welded to the corresponding location, meaning that the flow rate parameter will be locked after the plug is installed.

[0091] When the flow distribution between each side liquid cooling plate 400 is uneven, the flow rate can be controlled by adjusting the flow resistance between the side plate inlet 410 and the side plate outlet 420 of each individual side liquid cooling plate 400. The side liquid cooling plate 400 is provided with side plate flow channels 430 arranged in a serpentine, U-shaped, or other manner. The side plate flow channel 430 can be a single channel or a multi-channel system with multiple sub-channels arranged in parallel.

[0092] When the liquid flow distribution between the side liquid cooling plates is uneven, the flow can be balanced by adjusting the flow resistance between the inlet and outlet of each side liquid cooling plate. The side liquid cooling plates are designed with flow channels arranged in different patterns such as serpentine or U-shape. These flow channels can be a single channel or a complex flow channel system composed of multiple sub-channels arranged in parallel.

[0093] Flow distribution refers to the distribution of liquid flow across multiple channels. If the distribution is uneven, the cooling effect of some parts may be better or worse than that of other parts. Uneven distribution can be intentionally used to address uneven heat generation sources and ensure overall heat dissipation efficiency.

[0094] Flow resistance refers to the resistance encountered by a fluid during its flow. Changing the flow resistance can adjust the fluid flow rate, resulting in a more uniform distribution of liquid within the liquid cooling plates on all sides. A serpentine flow channel refers to a flow channel layout resembling the shape of a snake, meandering and twisting. This design increases the contact area between the fluid and the channel walls, improving cooling efficiency. A U-shaped flow channel refers to a flow channel layout resembling the shape of the letter "U." This design also increases the length of the liquid flow path, improving cooling efficiency. A single-channel flow system refers to a flow system with only one main flow path in which the liquid flows. A multi-channel flow system refers to a flow system with multiple parallel flow paths, each allowing liquid flow; this design further enhances the flexibility and efficiency of the cooling system.

[0095] Similarly, the flow distribution ratio between the bottom liquid cooling plate 300 and the side liquid cooling plate 400 can be controlled by controlling the flow resistance in a local area between the liquid inlet 410 and the liquid outlet 420 of the side plate of the bottom liquid cooling plate 300. This allows for different flow ratios between the bottom liquid cooling plate 300 and the side liquid cooling plate 400, such as 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, and 8:2.

[0096] In some examples, each merged module 1000 is provided with three battery cell modules 200 connected in parallel, and the three battery cell modules 200 are adapted to four side liquid cooling plates 400.

[0097] The three battery cell modules 200 include a first module 1001, a second module 1002 and a third module 1003, and the four side liquid cooling plates 400 include a first liquid cooling plate 1004, a second liquid cooling plate 1005, a third liquid cooling plate 1006 and a fourth liquid cooling plate 1007.

[0098] The first module 1001 has a first liquid cooling plate 1004 and a second liquid cooling plate 1005 respectively on both sides. The second module 1002 has a second liquid cooling plate 1005 and a third liquid cooling plate 1006 respectively on both sides. The first module 1001 and the second module 1002 share the second liquid cooling plate 1005. The third module 1003 has a third liquid cooling plate 1006 and a fourth liquid cooling plate 1007 respectively on both sides. The second module 1002 and the third module 1003 share the third liquid cooling plate 1006.

[0099] The first liquid cooling plate 1004 and the second liquid cooling plate 1005 are symmetrically arranged with respect to the first module 1001, the second liquid cooling plate 1005 and the third liquid cooling plate 1006 are symmetrically arranged with respect to the second module 1002, and the third liquid cooling plate 1006 and the fourth liquid cooling plate 1007 are symmetrically arranged with respect to the third module 1003.

[0100] The above-described exemplary configuration includes a combined module 1000, in which each combined module 1000 contains three battery cell modules 200 connected in series or parallel. These three battery cell modules 200 are adapted to four side liquid cooling plates 400. The three battery cell modules 200 are referred to as the first module 1001, the second module 1002, and the third module 1003, respectively, while the four side liquid cooling plates 400 are referred to as the first liquid cooling plate 1004, the second liquid cooling plate 1005, the third liquid cooling plate 1006, and the fourth liquid cooling plate 1007, respectively.

[0101] Specifically, the first module 1001 is equipped with a first liquid cooling plate 1004 and a second liquid cooling plate 1005 on both sides, while the second module 1002 is equipped with a second liquid cooling plate 1005 and a third liquid cooling plate 1006 on both sides. It is worth noting that the first module 1001 and the second module 1002 share the same second liquid cooling plate 1005. As for the third module 1003, it is equipped with a third liquid cooling plate 1006 and a fourth liquid cooling plate 1007 on both sides, while the second module 1002 and the third module 1003 share the same third liquid cooling plate 1006.

[0102] In these configurations, the first liquid cooling plate 1004 and the second liquid cooling plate 1005 are symmetrically arranged relative to the first module 1001, meaning they are arranged symmetrically on both sides of the first module 1001. Similarly, the second liquid cooling plate 1005 and the third liquid cooling plate 1006 are also symmetrically arranged relative to the second module 1002, indicating they are arranged symmetrically on both sides of the second module 1002. Finally, the third liquid cooling plate 1006 and the fourth liquid cooling plate 1007 are also symmetrically arranged relative to the third module 1003, meaning they are arranged symmetrically on both sides of the third module 1003.

[0103] In some examples, the bottom of the merged module 1000 is provided with a bottom liquid cooling plate 300, and the first liquid cooling plate 1004, the second liquid cooling plate 1005, the third liquid cooling plate 1006 and the fourth liquid cooling plate 1007 are all connected in parallel to the bottom liquid cooling plate 300.

[0104] The ends of the first liquid cooling plate 1004 and the second liquid cooling plate 1005 are connected in parallel through a parallel pipe 500, and the ends of the third liquid cooling plate 1006 and the fourth liquid cooling plate 1007 are connected in parallel through a parallel pipe 500.

[0105] A bottom liquid cooling plate 300 is provided at the bottom of the integrated module 1000, and the first liquid cooling plate 1004, the second liquid cooling plate 1005, the third liquid cooling plate 1006, and the fourth liquid cooling plate 1007 are all connected to the bottom liquid cooling plate 300 in parallel. Specifically, one end of the first liquid cooling plate 1004 is connected to one end of the second liquid cooling plate 1005 through a parallel pipe 500, forming a parallel relationship. Similarly, one end of the third liquid cooling plate 1006 is also connected to one end of the fourth liquid cooling plate 1007 through a parallel pipe 500, forming another parallel relationship. This arrangement ensures that the coolant flows between the liquid cooling plates, thereby improving the overall cooling efficiency.

[0106] Since each side liquid cooling plate 400 includes a side plate liquid inlet 410 and a side plate liquid outlet 420, the parallel pipes 500 also appear in pairs. That is, taking the parallel connection of the first liquid cooling plate 1004 and the second liquid cooling plate 1005 as an example, the side plate liquid inlet 410 of the first liquid cooling plate 1004 and the side plate liquid inlet 410 of the second liquid cooling plate 1005 are first connected by pipes, and the two pipes are connected and combined into one before being connected in parallel with the bottom liquid cooling plate 300 through a metal water nozzle welded to the bottom liquid cooling plate 300. Similarly, the side plate liquid outlet 420 of the first liquid cooling plate 1004 and the side plate liquid outlet 420 of the second liquid cooling plate 1005 are first connected by pipes, and the two pipes are connected and combined into one before being connected in parallel with the bottom liquid cooling plate 300 through a metal water nozzle welded to the bottom liquid cooling plate 300.

[0107] The liquid cooling system, consisting of all the liquid cooling plates, also includes at least one coolant pump. The coolant pump can be mounted on the battery pack, and its specific location can be rotated as needed, for example, it can be connected to the bottom liquid cooling plate 300. The coolant pump is used to drive the coolant to circulate between the first liquid cooling plate 1004, the second liquid cooling plate 1005, the third liquid cooling plate 1006, and the fourth liquid cooling plate 1007.

[0108] In addition, the integrated module 1000 may also include at least one liquid-cooled temperature sensor for monitoring the temperature of the coolant. The temperature sensor may be located on the bottom liquid-cooled plate 300, or on any one of the first liquid-cooled plate 1004, the second liquid-cooled plate 1005, the third liquid-cooled plate 1006, and the fourth liquid-cooled plate 1007. By monitoring the temperature, the operating status of the coolant pump can be adjusted in real time to ensure that the battery pack operates within its optimal temperature range.

[0109] The above structure can be achieved by directly connecting the side liquid cooling plates 400 in parallel through water nozzles welded to the bottom liquid cooling plate 300. This saves a large number of parallel pipes 500 connecting the side liquid cooling plates 400 and the side liquid cooling plates 400 and the bottom liquid cooling plate 300, saving material quantity and space, and improving the overall structural stability and sealing of the solution.

[0110] In some examples, the bottom liquid cooling plate 300 and the side liquid cooling plate 400 are arranged in a serpentine pattern with at least two parallel flow channels.

[0111] The coolant flow paths within the bottom liquid cooling plate 300 and the side liquid cooling plate 400 are arranged in at least two parallel serpentine patterns. This arrangement allows the coolant to more effectively cover the entire surface of the cooling plate during flow, resulting in better heat dissipation. Even in extreme cases where a single flow path becomes blocked, the overall heat dissipation performance is not significantly affected because the other flow paths remain unobstructed, thus ensuring stable system operation and continuous cooling of the equipment. This design not only improves heat dissipation efficiency but also enhances system reliability, ensuring good heat dissipation performance under various operating environments.

[0112] In some examples, the side plate liquid inlet 410 of the side liquid cooling plate 400 is located above the side plate liquid outlet 420, and the direction above is the opposite of the side liquid cooling plate 400 from the bottom liquid cooling plate 300.

[0113] The side liquid cooling plate 400 has a liquid inlet end and a liquid outlet end. The area where the liquid inlet end is located is the liquid inlet area, and the area where the liquid outlet end is located is the liquid outlet area. The side plate liquid inlet 410 is located above the liquid inlet area inside the corresponding flow channel, and the side plate liquid outlet 420 is located above the liquid outlet area inside the corresponding flow channel. See details below. Figure 7 .

[0114] In some specific embodiments, the side plate inlet 410 of the side liquid cooling plate 400 is positioned above the side plate outlet 420. This arrangement ensures that after the liquid enters through the side plate inlet 410, it can flow smoothly along the internal flow channel of the side liquid cooling plate 400 and finally be discharged through the side plate outlet 420. Furthermore, this arrangement keeps the upper portion of the side liquid cooling plate 400 away from the bottom liquid cooling plate 300, thus providing sufficient space and a smooth path for liquid flow.

[0115] Furthermore, the side plate inlet 410 is positioned above the inlet area inside the corresponding flow channel to ensure that the liquid can smoothly enter the flow channel and begin its cooling cycle. Similarly, the side plate outlet 420 is cleverly positioned above the outlet area inside the corresponding flow channel so that the liquid can smoothly drain out after completing its cooling task. This arrangement not only optimizes the liquid flow path but also ensures maximum cooling efficiency.

[0116] The side liquid cooling plate 400 has a side plate inlet 410 connected upstream of the bottom liquid cooling plate 300 in terms of coolant flow, and a side plate outlet 420 connected downstream of the bottom liquid cooling plate 300 relative to the side plate inlet 410 in terms of coolant flow. This connection means that the coolant first enters the side liquid cooling plate 400 through the inlet, then flows through the entire side liquid cooling plate, and finally flows out through the outlet downstream of the bottom liquid cooling plate. This design ensures that the coolant flows throughout the entire side liquid cooling plate 400 and carries away heat to help dissipate heat and maintain the normal operating temperature of the battery cell.

[0117] The upstream position mentioned above refers to the location closer to the liquid inlet in the liquid flow path compared to the downstream position. The downstream position refers to the location closer to the liquid outlet in the liquid flow path compared to the upstream position.

[0118] Figures 8 to 11 In some examples, at least two cell modules 200 are arranged side by side to form a combined module 1000, in which adjacent two cell modules 200 share a side liquid cooling plate 400.

[0119] At least two merging modules 1000 are provided, with two adjacent merging modules 1000 spaced apart in the receiving cavity, and the merging modules 1000 can be disassembled and replaced relative to the entire housing.

[0120] At least two cell modules 200 are arranged side by side and together form a combined module 1000. In this combined module 1000, two adjacent cell modules 200 share a side liquid cooling plate 400. This arrangement not only saves space but also improves cooling efficiency.

[0121] The number of combined modules 1000 is at least two. The two combined modules 1000 are spaced apart within the housing for easy maintenance and replacement. Each combined module 1000 can be independently removed and installed from the housing, greatly simplifying the maintenance process and improving system maintainability. This modular setup makes the entire battery system more flexible and reliable.

[0122] All parallel pipes 500 are distributed within the intervals between the two combined modules 1000. This arrangement of parallel pipes 500 does not occupy the intermediate area between water pipes, facilitating the layout of the battery pack's high-voltage wiring harness, low-voltage wiring harness, and control unit.

[0123] In some examples, an adhesive limiting strip is provided between the side liquid cooling plate 400 and the cell module 200. The adhesive limiting strip is used to limit the gap between the side liquid cooling plate 400 and the cell module 200, and to ensure that the gap error at different positions is lower than a preset value. The gap is filled with thermally conductive structural adhesive.

[0124] The adhesive limiting strip is used to ensure the heat dissipation effect and overall structural stability of the battery module, and to further optimize the contact between the side liquid cooling plate 400 and the cell module 200, ensuring that the gap between them is uniform and the error is controlled within a preset range. The function of this adhesive limiting strip is to restrict and fix the gap between the liquid cooling plate and the cell module 200, so that the gap error at different positions is lower than a preset value, thereby ensuring the heat dissipation performance and structural stability of the entire battery module. To further improve heat dissipation efficiency, thermally conductive structural adhesive is filled into the gap. This structural adhesive not only has good thermal conductivity but also serves to fix and seal, ensuring tight contact between the liquid cooling plate and the cell module 200.

[0125] After the side liquid cooling plate 400 and the side of the module are connected with thermally conductive structural adhesive, they are rigidly fixed with bolts and mounting brackets 600 to prevent the side liquid cooling plate 400 from shifting when multiple rows of modules are hoisted.

[0126] Both the side liquid cooling plate 400 and the bottom liquid cooling plate 300 are made of aluminum alloy profiles. Their manufacturing process can be either aluminum profile extrusion or stamping and blow molding. Aluminum profile extrusion is a common manufacturing method where aluminum material is heated to a certain temperature and then extruded through a die to obtain the desired shape of the liquid cooling plate. Stamping and blow molding, on the other hand, involves stamping followed by blow molding to achieve the required shape and size of the liquid cooling plate.

[0127] Aluminum alloy was chosen as the primary material for manufacturing the side liquid cooling plate 400 and the bottom liquid cooling plate 300. Aluminum alloy possesses excellent thermal conductivity and mechanical strength, making it suitable for manufacturing liquid cooling plates. To further improve production efficiency and reduce costs, aluminum profile extrusion can be employed, a process that can rapidly produce aluminum alloy profiles with complex shapes and precise dimensions. Alternatively, stamping and blow molding processes can also be used, both of which meet the manufacturing requirements of liquid cooling plates. Stamping allows for rapid forming, while blow molding further enhances the material's strength and stability. Regardless of whether aluminum profile extrusion or stamping and blow molding processes are chosen, the ultimate goal is to ensure the performance and quality of the liquid cooling plates, thereby providing an efficient heat dissipation solution for the battery module.

[0128] In some examples, the gap size is 'a', where 0.5mm ≤ a ≤ 5mm. The thickness of the thermally conductive structural adhesive is 'b', where 0.5mm ≤ b ≤ 5mm, and the thickness of the thermally conductive structural adhesive is matched to the gap size.

[0129] The gap dimension between the liquid cooling plates is set to 'a', with a value between 0.5 mm and 5 mm. This setting ensures proper dimensional accuracy between the liquid cooling plates to meet heat dissipation and structural strength requirements. Simultaneously, the thickness of the thermally conductive structural adhesive is set to 'b', also between 0.5 mm and 5 mm. The function of the thermally conductive structural adhesive is to fill the gap between the liquid cooling plates to ensure good heat conduction. To ensure that the thermally conductive structural adhesive can effectively fill the gap and perform its thermal conductivity function, its thickness is matched to the gap dimension, thereby ensuring tight contact and good thermal conductivity between the liquid cooling plates.

[0130] The battery pack structure includes two integrated modules 1000, designated as the first integrated module 1100 and the second integrated module 1200. These two integrated modules 1000 are intentionally spaced apart to ensure sufficient space between them. Within this spaced area, multiple side liquid cooling plates 400 and a bottom liquid cooling plate 300 are arranged, connected in parallel to form a parallel pipeline 500. This reduces the length of the parallel pipeline 500, effectively lowering the overall volume of the battery pack. This arrangement not only improves space utilization but also optimizes the overall performance of the battery pack.

[0131] Specifically, each cell module 200 is composed of multiple cell components connected in series. These cell components are configured to be connected in series with each other, ultimately forming a complete cell module 200. Each cell module 200 contains multiple sets of cell components, which are cleverly combined to form a combined module 1000. The multiple combined modules 1000 are spaced apart along the length of the battery pack, ensuring sufficient space between each combined module 1000 for heat dissipation and maintenance. This spacing not only helps improve the heat dissipation efficiency of the battery pack but also facilitates future maintenance and upgrades.

[0132] In this application, the thickness of the side liquid cooling plate 400 can be designed to be between 3 mm and 10 mm to meet different heat dissipation requirements. To ensure the insulation performance of the module side, an insulating varnish layer can be sprayed onto the surface of the side liquid cooling plate 400. The thickness of this insulating varnish layer can be controlled between 50 micrometers and 500 micrometers to provide sufficient protection to prevent electrical short circuits or leakage.

[0133] Furthermore, the design of the side liquid cooling plate 400 eliminates the traditional manifold used to isolate the inlet and outlet channels. Instead, effective isolation of the inlet and outlet channels is achieved by welding the end plug of the side liquid cooling plate 400 to the plate body. This design not only simplifies the structure but also improves the reliability of the seal.

[0134] To further save space and optimize the battery pack layout, the inlet and outlet water nozzles of the side liquid cooling plate 400 are located at the ends not exceeding the length of the liquid cooling plate body. This layout significantly reduces the overall length of the liquid cooling plate, allowing for more flexible battery pack layout within a limited space.

[0135] The thermal management solution proposed in this utility model proposal has broad applicability and can adapt to modules with different cell arrangement directions and battery packs with different numbers of modules. Whether the cells are arranged forward, sideways, or upside down, this solution can provide effective thermal management. At the same time, it is also very flexible in terms of the number of modules; whether it is a three-row module or a module with more rows, this solution can provide good heat dissipation performance, ensuring the stable operation of the battery pack in various application scenarios.

[0136] Secondly, this application provides an electrical device, including the aforementioned battery pack and housing, with the battery pack disposed within the housing.

[0137] Electrical devices equipped with the battery pack described in this application can have all the side liquid cooling plates 400 connected in parallel to the bottom liquid cooling plate 300, thereby effectively reducing flow resistance and ensuring the flow of coolant between the liquid cooling plates, thus achieving a highly efficient heat dissipation effect.

[0138] Specifically, the housing has an internal cavity for housing the battery cell module 200. The battery cell module 200 is installed within the cavity to ensure its stability and safety. To effectively control the heat generated by the battery cell module 200 during operation, a bottom liquid cooling plate 300 is installed at the bottom of the battery cell module 200. The main function of the bottom liquid cooling plate 300 is to effectively dissipate heat from the bottom of the battery cell module 200, ensuring that the battery pack will not be affected by overheating during long-term operation, thus preventing any impact on performance or safety.

[0139] In addition to the bottom liquid cooling plate 300, this application also includes at least two side liquid cooling plates 400, which are mounted on both sides of the cell module 200. The main function of the side liquid cooling plates 400 is to dissipate heat from the sides of the cell module 200, thereby further improving the overall heat dissipation effect of the battery pack. To achieve optimal heat dissipation, adjacent side liquid cooling plates 400 are arranged in a mirror-symmetrical structure, ensuring that heat is evenly dissipated from both sides of the cell module 200. The assembly positions of the two side liquid cooling plates 400 are also mirror-symmetrical.

[0140] Furthermore, to ensure the efficient operation of the entire heat dissipation system, the bottom liquid cooling plate 300 and the side liquid cooling plates 400 are tightly connected together by a fixed connection. All side liquid cooling plates 400 are configured to connect in parallel to the bottom liquid cooling plate 300, which ensures the flow of coolant between the liquid cooling plates, thereby achieving a highly efficient heat dissipation effect. Moreover, the parallel connection effectively reduces flow resistance, further guaranteeing heat dissipation efficiency. With this configuration, the battery pack can maintain good heat dissipation performance under various operating environments, ensuring battery stability and extending its service life.

[0141] The enclosure and the cell module 200 can be assembled in various ways. That is, the cell module 200 can be installed upside down inside the enclosure, or it can be installed normally. When installed upside down, the electrode posts of the assembled cell module 200 face downwards. When assembled normally, the electrode posts of the assembled cell module 200 face upwards.

[0142] The aforementioned electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, energy storage devices, amusement equipment, elevators, and lifting equipment, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, containerized energy storage, etc.; amusement equipment can be carousels, drop towers, etc. This application does not impose special restrictions on the aforementioned electrical equipment.

[0143] In the accompanying drawings of this application, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0144] The above are merely preferred examples of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A battery pack, characterized in that, The battery pack includes: The box-shaped enclosure has a receiving cavity; The battery cell module is installed inside the receiving cavity; A bottom liquid cooling plate is disposed at the bottom of the battery cell module, and the bottom liquid cooling plate is used for heat dissipation at the bottom of the battery cell module. Multiple side liquid cooling plates are disposed on the side of the battery cell module, and the side liquid cooling plates are used to dissipate heat from the side of the battery cell module. The bottom liquid cooling plate is fixedly connected to the side liquid cooling plate, and multiple side liquid cooling plates are connected in parallel to the bottom liquid cooling plate.

2. The battery pack as described in claim 1, characterized in that, At least two of the battery cell modules are arranged side by side to form a combined module, wherein two adjacent battery cell modules in the combined module share a side liquid cooling plate; Each of the battery cell modules is provided with a side liquid cooling plate on both sides, and the two side liquid cooling plates are mirror-symmetrical with respect to the battery cell module; at least two of the side liquid cooling plates are connected in parallel through parallel pipelines to form a parallel liquid inlet connector and a parallel liquid return connector. The parallel liquid inlet connector is connected to the parallel liquid inlet on the bottom liquid cooling plate, and the parallel liquid return connector is connected to the parallel liquid return on the bottom liquid cooling plate.

3. The battery pack as described in claim 2, characterized in that, Each of the combined modules is provided with three battery cell modules connected in parallel, and the three battery cell modules are adapted to the four side liquid cooling plates; The three battery cell modules include a first module, a second module, and a third module, and the four side liquid cooling plates include a first liquid cooling plate, a second liquid cooling plate, a third liquid cooling plate, and a fourth liquid cooling plate; The first module has a first liquid cooling plate and a second liquid cooling plate respectively on both sides, the second module has a second liquid cooling plate and a third liquid cooling plate respectively on both sides, the first module and the second module share the second liquid cooling plate, and the third module has a third liquid cooling plate and a fourth liquid cooling plate respectively on both sides, the second module and the third module share the third liquid cooling plate; The first liquid cooling plate and the second liquid cooling plate are symmetrically arranged with respect to the first module, the second liquid cooling plate and the third liquid cooling plate are symmetrically arranged with respect to the second module, and the third liquid cooling plate and the fourth liquid cooling plate are symmetrically arranged with respect to the third module.

4. The battery pack as described in claim 3, characterized in that, The bottom of the merged module is provided with a bottom liquid cooling plate, and the first liquid cooling plate, the second liquid cooling plate, the third liquid cooling plate and the fourth liquid cooling plate are all connected in parallel to the bottom liquid cooling plate; The ends of the first liquid cooling plate and the second liquid cooling plate are connected in parallel through parallel pipelines, and the ends of the third liquid cooling plate and the fourth liquid cooling plate are connected in parallel through parallel pipelines.

5. The battery pack as described in claim 2, characterized in that, The flow rate in the shared side liquid cooling plate of the merged module is greater than the flow rate in the non-shared side liquid cooling plate; or, the flow rate in the side liquid cooling plate is adjustable; or, the flow rate of the side liquid cooling plate can be adjusted to a preset flow rate and marked during the production process.

6. The battery pack as described in any one of claims 1 to 5, characterized in that, The side liquid cooling plate has a liquid inlet located above the liquid outlet, and the direction above it is the side liquid cooling plate away from the bottom liquid cooling plate. The side plate inlet is located above the inlet area inside the corresponding flow channel, and the side plate outlet is located above the outlet area inside the corresponding flow channel.

7. The battery pack as described in any one of claims 2 to 5, characterized in that, At least two merging modules are provided, with adjacent merging modules spaced apart within the receiving cavity, and the merging modules can be disassembled and replaced as a whole relative to the housing.

8. The battery pack as described in any one of claims 1 to 5, characterized in that, An adhesive limiting strip is provided between the side liquid cooling plate and the battery cell module. The adhesive limiting strip is used to limit the gap between the side liquid cooling plate and the battery cell module and to ensure that the gap error at different positions is lower than a preset value. The gap is filled with thermally conductive structural adhesive.

9. The battery pack as described in claim 8, characterized in that, The size of the gap is a, 0.5mm≤a≤5mm; the thickness of the thermally conductive structural adhesive is b, 0.5mm≤b≤5mm, and the thickness of the thermally conductive structural adhesive is adapted to the size of the gap.

10. An electrical appliance, characterized in that, include: The battery pack as described in any one of claims 1 to 9; and, The housing contains the battery pack.

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