Battery pack and electric equipment

Abstract

The invention discloses a battery pack and electric equipment, and relates to the technical field of batteries, and the battery pack comprises a shell, a battery cell assembly, a flue assembly and a liquid cooling assembly. The shell is provided with an accommodating cavity; the battery core assembly is mounted in the accommodating cavity; at least part of the flue assembly is located in the accommodating cavity, and the flue assembly is arranged on one side of the battery cell assembly. The liquid cooling assembly is at least partially located in the containing cavity, and the liquid cooling assembly and the flue assembly are located on the same side of the battery cell assembly. The flue assembly comprises at least one smoke exhaust pipeline, the liquid cooling assembly comprises at least one liquid cooling pipeline, an assembling space is arranged between the side, provided with the anti-explosion valve, of the battery cell assembly and the inner wall of the containing cavity, and the smoke exhaust pipeline and the liquid cooling pipeline are located in the assembling space. And the smoke exhaust pipeline and the liquid cooling pipeline are distributed in the assembly space in parallel. According to the battery pack, the occupied space of the flue assembly and the liquid cooling assembly is smaller, the structure of the battery pack is more compact, and the energy density of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] The battery pack is made up of multiple components, including the battery cell component, flue component and liquid cooling component. These components are closely connected through connecting devices to ensure the efficient operation of the entire system.

[0003] Specifically, the flue assembly is used to quickly exhaust smoke when a cell assembly fails or is abnormal, thereby avoiding potential safety risks. The liquid cooling assembly is responsible for regulating the temperature of the cell assembly to ensure that it operates within the optimal temperature range, thereby maintaining the stability of the battery pack and extending its service life.

[0004] However, the flue assembly and liquid cooling assembly each occupy a certain amount of space in design, which limits the overall energy density of the battery pack to a certain extent. Summary of the invention

[0005] The present application provides a battery pack and an electrical device, which can reduce the space occupied by a flue assembly and a liquid cooling assembly, make the structure of the battery pack more compact, and improve the energy density of the battery pack.

[0006] In a first aspect, the present application provides a battery pack, which includes a shell, a battery cell assembly, a flue assembly and a liquid cooling assembly.

[0007] The housing has a receiving cavity. The battery core assembly is installed in the receiving cavity. The battery core assembly includes at least one battery core unit, and each battery core unit is provided with an explosion-proof valve.

[0008] The flue assembly is arranged on a side of the battery core assembly having an explosion-proof valve, at least one explosion-proof valve is adapted to the flue assembly, and the flue assembly includes at least one smoke exhaust pipe.

[0009] The liquid cooling component and the flue component are located on the same side of the battery core component. The liquid cooling component directly or indirectly abuts against the area to be cooled of the battery core component. The liquid cooling component includes at least one liquid cooling pipe.

[0010] An assembly space is provided between one side of the battery core assembly on which the explosion-proof valve is provided and the inner wall of the accommodating cavity, and the smoke exhaust pipe and the liquid cooling pipe are located in the assembly space.

[0011] In the direction of the opening of the explosion-proof valve, at least one smoke exhaust pipe and at least one liquid cooling pipe are distributed side by side in the assembly space.

[0012] The accommodating cavity in the above structure is used to accommodate other components. The battery cell assembly is installed in the accommodating cavity. The battery cell assembly is composed of at least one battery cell unit, and each battery cell unit is equipped with an explosion-proof valve to ensure that the pressure can be safely released when an abnormality occurs in the battery.

[0013] The flue assembly is arranged on the side of the battery cell assembly with the explosion-proof valve, ensuring that it is consistent with the opening direction of the explosion-proof valve. The explosion-proof valve is adapted to the flue assembly so that when the explosion-proof valve is opened, the gas can be smoothly discharged through the flue assembly. The flue assembly mainly includes at least one exhaust pipe for guiding the gas to be discharged from the outside of the battery pack.

[0014] The liquid cooling assembly is on the same side of the battery cell assembly as the flue assembly to ensure effective cooling during battery operation. The liquid cooling assembly directly or indirectly contacts the heat dissipation area of ​​the battery cell assembly to reduce the battery temperature by conducting heat. Coolant flows in the liquid cooling pipe to remove the heat generated by the battery cell assembly during charging or use.

[0015] An assembly space is specially set up between the side of the battery cell assembly where the explosion-proof valve is set and the inner wall of the accommodating chamber for easy installation and maintenance. The exhaust pipe and liquid cooling pipe are arranged in this assembly space, making the layout of the entire system more compact and orderly.

[0016] In the direction of the explosion-proof valve opening, at least one smoke exhaust pipe and at least one liquid cooling pipe are arranged side by side in the assembly space. This layout not only saves space, but also makes the flow path of gas and coolant more reasonable, improving the overall efficiency and safety of the system. Through this design, the battery pack can effectively dissipate heat and gas while ensuring safety, ensuring the stable operation of the battery.

[0017] In some examples, at least one smoke exhaust duct and at least one liquid cooling duct are at least partially alternately arranged.

[0018] The above structure can make the layout of the smoke exhaust pipe and the liquid cooling pipe more stable and reasonable, and realize the layout of the liquid cooling pipe in the gap between adjacent smoke exhaust pipes, so that the liquid cooling pipe can make full use of the space in the battery pack and improve the space utilization rate. In addition, the overall space occupied by the smoke exhaust pipe and the liquid cooling pipe can be smaller, the structure of the battery pack can be more compact, and the energy density of the battery pack can be improved.

[0019] In some examples, the flue assembly further includes a mica board, which covers the explosion-proof valve on the battery cell assembly. The mica board is provided with an engraved structure compatible with the explosion-proof valve, and each engraved structure corresponds to an explosion-proof valve.

[0020] At least one smoke exhaust inlet is arranged on the smoke exhaust pipe, the explosion-proof valve corresponds to the smoke exhaust inlet one by one, and the engraved structure is located between the smoke exhaust inlet and the explosion-proof valve.

[0021] In the above structure of the present application, the flue assembly includes a mica board, a smoke exhaust pipe and a flue buffer in sequence along the direction away from the battery cell assembly. Among them, the mica board is used to cover the explosion-proof valve above the battery cell assembly to provide protection and isolation for the explosion-proof valve. In order to ensure a better fit with the explosion-proof valve, an engraved structure adapted to the explosion-proof valve is specially provided on the mica board. Each engraved structure corresponds to an explosion-proof valve. This engraved structure not only ensures the normal operation of the explosion-proof valve, but also improves the overall safety performance. When the battery cell assembly generates violent smoke, the smoke can break through the engraved structure and guide the smoke into the smoke exhaust pipe.

[0022] The smoke exhaust duct can be set between the mica board and the flue buffer to play a role in directional smoke exhaust. The setting of the smoke exhaust duct not only helps to guide the smoke to be discharged smoothly, but also effectively reduces the direct impact of the smoke on the battery cell components. In addition, the smoke exhaust duct can also take into account the requirements of thermal expansion and mechanical strength to ensure that it can remain stable under high temperature and high pressure environments.

[0023] In some examples, the flue assembly further includes a flue buffer, which is located on the side of the smoke exhaust pipe away from the explosion-proof valve, one side of the flue buffer abuts against the smoke exhaust pipe, and the other side of the flue buffer abuts against the inner wall of the accommodating chamber.

[0024] The flue buffer can be set on one side of the smoke exhaust pipe. Its function is to abut and fix the smoke exhaust pipe to prevent it from being displaced during operation. It can also have the functions of buffering and vibration reduction, reducing tolerance, etc. The other side of the flue buffer abuts the inner wall of the accommodating cavity, so that the entire flue buffer can play a role in buffering and shock absorbing the smoke exhaust pipe. The above-mentioned design can not only absorb the stress caused by thermal expansion or mechanical vibration, but also reduce the noise generated during the flow of smoke, thereby improving the stability and reliability of the entire system. Through this multi-level structural design, the flue assembly can effectively protect the battery cell assembly and ensure its safe and stable operation under various working conditions.

[0025] In some examples, the smoke exhaust duct includes a duct body and at least one heat-resistant insulation layer, the at least one heat-resistant insulation layer is wrapped around the outer circumference of the duct body, and an avoidance cutout is provided in the area corresponding to the heat-resistant insulation layer and the explosion-proof valve.

[0026] The heat-resistant insulating layer can be flue mica paper and / or flue insulation layer. The main function of adding mica paper and insulation layer to the flue in the battery pack is to improve the safety performance of the battery pack. Mica paper has excellent high temperature resistance and can provide effective protection when the battery overheats, preventing heat from spreading to other parts of the battery pack, thereby avoiding more serious safety accidents. At the same time, mica paper also has good insulation properties, which can prevent short circuits between electrodes inside the battery pack and ensure the normal operation of the battery.

[0027] The smoke exhaust duct mentioned in the present application is wrapped by at least one layer of flue mica paper and / or flue insulation layer. This design can play a role of protection and isolation, ensuring that the smoke exhaust duct can still work normally in an environment of high temperature and harmful gases, thereby extending the service life of the battery pack and improving its safety. The presence of the flue mica paper and the flue insulation layer can not only effectively isolate heat transfer and prevent heat from damaging other components inside the battery pack (such as undamaged battery cells), but also reduce the interference of the external environment on the battery pack, ensuring that the battery pack can operate stably under various complex conditions. In addition, this wrapping layer can also play a certain role in fire prevention and heat insulation, further improving the overall safety performance of the battery pack.

[0028] In some examples, at least one group of bars are provided on the battery cell assembly, the bar and the explosion-proof valve are on the same side of the battery cell assembly, the bar and the explosion-proof valve are spaced apart, the liquid cooling pipe is directly or indirectly connected to the bar, and the liquid cooling pipe and the bar can perform heat exchange.

[0029] At least one group of bars is configured on the battery cell assembly. These bars are located away from the main part of the battery cell assembly. The liquid cooling pipe is arranged on the other side of these bars, specifically on the side away from the battery cell assembly relative to the bars. Each bar is connected to at least one pole, which is a key component in the battery cell assembly and is responsible for conducting current. Since the battery cell assembly generates a lot of heat during operation, and these heat sources are mainly concentrated on the poles, the temperature of the poles can be indirectly adjusted by cooling the bars. In this way, the overall temperature of the battery cell assembly can be effectively controlled, thereby ensuring the performance and safety of the battery.

[0030] In some examples, a thermal pad is provided between the liquid cooling pipe and the bar.

[0031] The introduction of the thermal pad in the above structure further improves the thermal conductivity of the battery. The presence of the thermal pad allows the heat on the battery to be dispersed more evenly, and the dispersed heat can be more effectively exchanged with the liquid cooling pipe. This improved heat exchange efficiency is higher, thereby further improving the heat dissipation performance of the entire battery pack.

[0032] In some examples, the liquid cooling assembly includes a thermal pad, a liquid cooling pipe, and a liquid cooling buffer in sequence along a direction away from the battery cell assembly, and the thermal pad covers a tab on the battery cell assembly.

[0033] The liquid cooling pipe is arranged between the heat conducting pad and the liquid cooling buffer. The liquid cooling buffer is arranged on one side to abut against the smoke exhaust pipe, and the other side of the liquid cooling buffer abuts against the inner wall of the accommodating cavity.

[0034] The above-mentioned liquid cooling assembly includes a thermal pad, a liquid cooling pipe and a liquid cooling buffer in sequence along the direction away from the battery cell assembly. The thermal pad can be used to cover the bar above the battery cell assembly to ensure that heat can be effectively transferred from the battery cell assembly through the bar to the thermal pad. The liquid cooling pipe can be placed between the thermal pad and the liquid cooling buffer to serve as a channel for the flow of coolant, and the thermal pad can be heat exchanged through the liquid cooling pipe. One side of the liquid cooling buffer is close to the exhaust pipe, and the other side is close to the inner wall of the accommodating cavity, thereby ensuring that the liquid cooling assembly can be stably fixed in space.

[0035] In some examples, the battery pack further includes a flexible circuit board, which is disposed between two adjacent groups of tabs, and a plurality of explosion-proof valves are disposed between the two adjacent groups of tabs.

[0036] An escape space is arranged on the flexible circuit board, and the escape space is used to escape the explosion-proof valve and the flue component.

[0037] The design of the battery pack not only includes battery cells, but also adds the configuration of flexible circuit boards. These flexible circuit boards are carefully arranged between two adjacent groups of battery cells to ensure the compactness and functionality of the overall structure. In order to further improve the safety performance of the battery pack, the above-mentioned multiple explosion-proof valves are also set between two adjacent groups of battery cells. The function of these explosion-proof valves is to quickly release the internal pressure when an abnormal situation occurs in the battery, thereby effectively preventing potential dangers.

[0038] In order to ensure that these explosion-proof valves and flue components can operate smoothly in the battery pack, avoidance spaces are specially designed on the flexible circuit board. The existence of these avoidance spaces prevents the explosion-proof valves and flue components from being disturbed by the flexible circuit board during operation, thus ensuring that they can perform their respective functions normally. Through this meticulous design, the overall performance of the battery pack has been significantly improved, and its safety and reliability have also been greatly enhanced.

[0039] The flexible circuit board includes a connecting body, a first detecting sub-body and a second detecting sub-body. The connecting body is provided with a connecting interface for connecting to a battery management system. The first detecting sub-body is electrically connected to one of the two groups of bars, and the second detecting sub-body is electrically connected to the other group of the two groups of bars.

[0040] The connecting body, the first detection sub-body and the second detection sub-body cooperate to form a "U"-shaped structure, and the "U"-shaped structure has a groove-shaped avoidance space.

[0041] In a second aspect, the present application provides an electrical device, including the above-mentioned battery pack and a device body, the device body is provided with a battery assembly cavity, and the battery pack is arranged in the battery assembly cavity.

[0042] The electrical equipment with the above-mentioned battery pack can make the occupied space of the flue assembly and the liquid cooling assembly smaller, make the structure of the battery pack more compact, and improve the energy density of the battery pack. Specifically, the smoke exhaust duct and the liquid cooling duct are designed to be at least partially arranged side by side in the assembly space between the battery cell assembly and the inner wall of the accommodating cavity. This design allows the space occupied by the smoke exhaust duct and the liquid cooling duct in the thickness direction to overlap, thereby significantly reducing the overall space required for the flue assembly and the liquid cooling assembly. In this way, the overall structure of the battery pack becomes more compact, which helps to improve the energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the examples or prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 This is a schematic diagram of the structure of a battery pack in an example of the present application.

[0045] Figure 2 In this application example Figure 1 A cross-sectional schematic diagram showing the alternating arrangement of the flue assembly and the liquid cooling assembly in the battery pack in the middle AA direction.

[0046] Figure 3 For this application Figure 2 An enlarged schematic diagram of the smoke exhaust component structural section at point A in the middle.

[0047] Figure 4 This is a schematic diagram of the structural explosion of the smoke exhaust assembly after the liquid cooling assembly of the battery pack is hidden in an example of the present application.

[0048] Figure 5 For this application Figure 2 An enlarged schematic diagram of the liquid cooling component structural section at B in the middle.

[0049] Figure 6 This is a schematic diagram of the structural explosion of the liquid cooling assembly of the battery pack after the smoke exhaust assembly is hidden in an example of the present application.

[0050] Reference numerals:

[0051] 100, shell; 110, accommodating cavity; 200, battery cell assembly; 210, battery cell unit; 220, explosion-proof valve; 230, bar piece; 300, flue assembly; 310, mica board; 311, engraving structure; 320, smoke exhaust pipe; 321, flue mica paper; 322, smoke exhaust inlet; 330, flue buffer; 340, PC board; 400, liquid cooling assembly; 410, thermal pad; 420, liquid cooling pipe; 421, liquid cooling mica paper; 422, liquid cooling channel; 430, liquid cooling buffer; 440, converging main pipe. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific examples described here are only used to explain the present application and are not used to limit the present application.

[0053] To solve the above technical problems, please refer to Figure 1-Figure 6 As shown, the first aspect of the present application proposes a battery pack, which can reduce the space occupied by the flue assembly 300 and the liquid cooling assembly 400, make the structure of the battery pack more compact, and improve the energy density of the battery pack.

[0054] Reference Figure 1 and Figure 2 As shown, in some examples, the battery pack includes a housing 100 , a battery cell assembly 200 , a flue assembly 300 , and a liquid cooling assembly 400 .

[0055] The housing 100 has a receiving chamber 110 . The battery cell assembly 200 is installed in the receiving chamber 110 . The battery cell assembly 200 includes at least one battery cell unit 210 . Each battery cell unit 210 is provided with an explosion-proof valve 220 .

[0056] The flue assembly 300 is disposed on a side of the battery cell assembly 200 having the explosion-proof valve 220 . At least one explosion-proof valve 220 is adapted to the flue assembly 300 . The flue assembly 300 includes at least one smoke exhaust pipe 320 .

[0057] The liquid cooling assembly 400 and the flue assembly 300 are located on the same side of the battery cell assembly 200 . The liquid cooling assembly 400 directly or indirectly abuts against the area to be cooled of the battery cell assembly 200 . The liquid cooling assembly 400 includes at least one liquid cooling pipe 420 .

[0058] An assembly space is provided between the side of the battery cell assembly 200 where the explosion-proof valve 220 is provided and the inner wall of the accommodating chamber 110 , and the smoke exhaust pipe 320 and the liquid cooling pipe 420 are located in the assembly space.

[0059] In the direction of the opening of the explosion-proof valve 220 , at least one smoke exhaust pipe 320 and at least one liquid cooling pipe 420 are arranged side by side in the assembly space.

[0060] The accommodating chamber 110 in the above structure is used to accommodate other components. The battery cell assembly 200 is installed in the accommodating chamber 110, and the battery cell assembly 200 is composed of at least one battery cell unit 210, and each battery cell unit 210 is equipped with an explosion-proof valve 220 to ensure that the pressure can be safely released when an abnormality occurs in the battery.

[0061] The flue assembly 300 is arranged on the side of the battery cell assembly 200 having the explosion-proof valve 220, ensuring that the opening direction is consistent with the explosion-proof valve 220. The explosion-proof valve 220 is adapted to the flue assembly 300, so that when the explosion-proof valve 220 is opened, the gas can be smoothly discharged through the flue assembly 300. The flue assembly 300 mainly includes at least one exhaust pipe 320, which is used to guide the gas to be discharged outside the battery pack.

[0062] The liquid cooling assembly 400 and the flue assembly 300 are located on the same side of the battery cell assembly 200 to ensure effective cooling during battery operation. The liquid cooling assembly 400 directly or indirectly contacts the heat dissipation area of ​​the battery cell assembly 200 to reduce the temperature of the battery by conducting heat. Cooling liquid flows in the liquid cooling pipe 420 to remove the heat generated by the battery cell assembly 200 during charging or use.

[0063] An assembly space is specially provided between the side of the battery cell assembly 200 where the explosion-proof valve 220 is provided and the inner wall of the accommodating chamber 110 for easy installation and maintenance. The smoke exhaust pipe 320 and the liquid cooling pipe 420 are both arranged in this assembly space, making the layout of the entire system more compact and orderly.

[0064] In the direction of the opening of the explosion-proof valve 220, at least one smoke exhaust pipe 320 and at least one liquid cooling pipe 420 are arranged side by side in the assembly space. Such a layout not only saves space, but also makes the flow path of gas and coolant more reasonable, improving the overall efficiency and safety of the system. Through this design, the battery pack can effectively dissipate heat and gas while ensuring safety, ensuring the stable operation of the battery.

[0065] The above structure allows the smoke exhaust pipe 320 and the liquid cooling pipe 420 to be at least partially arranged side by side, so that the space occupied by the two can overlap in the thickness direction, thereby making the space occupied by the flue assembly 300 and the liquid cooling assembly 400 smaller, making the structure of the battery pack more compact, and improving the energy density of the battery pack.

[0066] The smoke exhaust duct 320 and the liquid cooling duct 420 are designed to be at least partially arranged side by side in the assembly space between the battery cell assembly 200 and the inner wall of the accommodating chamber 110. This design allows the smoke exhaust duct 320 and the liquid cooling duct 420 to overlap in the thickness direction, thereby significantly reducing the overall space required for the flue assembly 300 and the liquid cooling assembly 400. In this way, the overall structure of the battery pack becomes more compact, which helps to improve the energy density of the battery pack, so that it can store more electrical energy in a limited space, which is of great significance for improving the performance and application range of the battery pack.

[0067] The above-mentioned liquid cooling component 400 can effectively cool the battery cell assembly 200, so that the battery cell assembly 200 can be better maintained at a suitable operating temperature. Suitable operating temperature refers to the temperature range in which the battery can maintain a stable state during the charging and discharging process. Within this temperature range, the battery cell assembly 200 can operate normally and is not prone to potential problems such as capacity decay, short circuit, and open circuit. This temperature condition helps to ensure the performance and life of the battery and avoid unstable battery performance or damage caused by excessively high or low temperatures. Therefore, selecting and maintaining a suitable battery operating temperature is crucial to the long-term stability and safety of the battery.

[0068] The battery pack of this application is referred to as CTP in English. CTP is the abbreviation of "Cell to Pack", which is a battery manufacturing technology. It refers to the process of directly assembling a battery pack from a single battery cell, eliminating the intermediate module step. A battery module refers to a combination of multiple batteries in a certain way, usually including components such as batteries, connecting pieces, and protection circuits. It is the basic unit of a battery pack. In some battery systems, multiple modules are combined into a battery pack to meet greater energy storage needs.

[0069] The traditional battery pack structure is a battery cell module battery pack chassis, while CTP technology directly connects the key structure ―― The module eliminates the internal structure of the battery cell and directly integrates the battery cell into the battery pack, so that the battery pack of the same volume can accommodate more batteries and the volume utilization rate reaches 55%.

[0070] Furthermore, CTP's upgraded version CTP 3.0 Kirin battery. On the basis of the module-free structure, the crossbeams, vertical beams, water-cooled plates, and thermal insulation pads are integrated into a multifunctional elastic interlayer. The functional modules share the bottom space of the battery pack, and water-cooled plates are placed between the cells, increasing the heat exchange area by 4 times. The internal volume utilization rate of the battery pack reaches 72%. According to official propaganda: The energy density of the lithium iron phosphate version is 160Wh / kg, and the ternary high nickel can reach 255Wh / kg, with a range of more than 1,000 kilometers. Supports 5-minute fast hot start and 10-minute fast charge. Low temperature performance has been improved.

[0071] Reference Figure 1 and Figure 2 As shown, in some examples, the smoke exhaust duct 320 and the liquid cooling duct 420 are at least partially alternately arranged in the assembly space. It can also be said that at least one smoke exhaust duct 320 and at least one liquid cooling duct 420 are at least partially alternately arranged. The above structure can make the layout of the smoke exhaust duct 320 and the liquid cooling duct 420 more stable and reasonable, and realize the layout of the liquid cooling duct 420 in the gap between adjacent smoke exhaust ducts 320, so that the liquid cooling duct 420 can make full use of the space in the battery pack and improve space utilization. In addition, the overall occupied space of the smoke exhaust duct 320 and the liquid cooling duct 420 can be made smaller, the structure of the battery pack can be made more compact, and the energy density of the battery pack can be improved.

[0072] The above-mentioned alternating arrangement is not limited to the alternating arrangement of two adjacent pipes of different types. For example, assuming that the exhaust pipe 320 is a and the liquid cooling pipe 420 is b, the alternating arrangement of the two is not limited to the "ababab" arrangement, but can also be the "abbabbabb" arrangement, or can be an irregular alternating arrangement such as "abbaabaaa". Specifically, adaptive adjustment can be made according to parameters such as the size of a single battery cell unit 210 in the battery cell assembly 200, the pole spacing, and the number of explosion-proof valves 220.

[0073] The flue assembly 300 further includes a mica plate 310, which covers the explosion-proof valve 220 on the battery cell assembly 200. The mica plate 310 is provided with an engraved structure 311 adapted to the explosion-proof valve 220, and each engraved structure 311 corresponds to one explosion-proof valve 220;

[0074] At least one smoke exhaust inlet 322 is disposed on the smoke exhaust pipe 320 , the explosion-proof valve 220 corresponds to the smoke exhaust inlet 322 one by one, and the engraved structure 311 is located between the smoke exhaust inlet 322 and the explosion-proof valve 220 .

[0075] Reference Figure 3 As shown, in some examples, the flue assembly 300 includes a mica board 310, a smoke exhaust pipe 320 and a flue buffer 330 in sequence in a direction away from the battery cell assembly 200, the mica board 310 covers the explosion-proof valve 220 on the battery cell assembly 200, and the mica board 310 is provided with an engraved structure 311 adapted to the explosion-proof valve 220;

[0076] The smoke exhaust pipe 320 is disposed between the mica board 310 and the flue buffer 330 . The flue buffer 330 is disposed such that one side thereof abuts against the smoke exhaust pipe 320 , and the other side thereof abuts against the inner wall of the accommodating chamber 110 .

[0077] In the above structure of the present application, the flue assembly 300 includes a mica board 310, a smoke exhaust pipe 320 and a flue buffer 330 in sequence along the direction away from the battery cell assembly 200. Among them, the mica board 310 is used to cover the explosion-proof valve 220 above the battery cell assembly 200 to provide protection and isolation for the explosion-proof valve 220. In order to ensure a perfect fit with the explosion-proof valve 220, an engraved structure 311 adapted to the explosion-proof valve 220 is specially provided on the mica board 310. This engraved structure 311 not only ensures the normal operation of the explosion-proof valve 220, but also improves the overall safety performance. When the battery cell assembly 200 generates intense smoke, the smoke can break through the engraved structure 311 and guide the smoke into the smoke exhaust pipe 320.

[0078] The smoke exhaust duct 320 can be arranged between the mica plate 310 and the flue buffer 330 to play a role in directional smoke exhaust. The arrangement of the smoke exhaust duct 320 not only helps to guide the smoke to be discharged smoothly, but also can effectively reduce the direct impact of the smoke on the battery cell assembly 200. In addition, the smoke exhaust duct 320 can also take into account the requirements of thermal expansion and mechanical strength to ensure that it can remain stable even in high temperature and high pressure environments.

[0079] The flue buffer 330 can be arranged on one side of the smoke exhaust pipe 320, and its function is to abut and fix the smoke exhaust pipe 320 to prevent it from being displaced during operation, and it can also have the functions of buffering and vibration reduction, reducing tolerance, etc. The other side of the flue buffer 330 abuts against the inner wall of the accommodating chamber 110, so that the entire flue buffer 330 can play a role in buffering and shock absorbing the smoke exhaust pipe 320. The above-mentioned design can not only absorb the stress caused by thermal expansion or mechanical vibration, but also reduce the noise generated during the flow of smoke, thereby improving the stability and reliability of the entire system. Through this multi-level structural design, the flue assembly 300 can effectively protect the battery cell assembly 200, ensuring that it can operate safely and stably under various working conditions.

[0080] A PC board 340 may be provided between the mica board 310 and the battery cell assembly 200. The PC board 340 has the dual functions of insulation and heat conduction. Such a PC board 340 can not only effectively prevent current leakage and ensure the safe operation of the entire system, but also help disperse and conduct the heat generated by the battery cell assembly 200 during operation, thereby improving the overall heat dissipation efficiency. Through this design, the performance and service life of the battery pack can be further improved, ensuring that the electrical equipment with the battery pack remains stable and reliable during long-term operation.

[0081] Reference Figure 3 As shown, in some examples, the smoke exhaust duct includes a duct body and at least one heat-resistant insulation layer, at least one heat-resistant insulation layer is wrapped around the outer peripheral side of the duct body, and an avoidance cut is provided in the area corresponding to the heat-resistant insulation layer and the explosion-proof valve.

[0082] Specifically, the circumference of the smoke exhaust duct 320 in the battery pack is wrapped with at least one layer of flue mica paper 321 and / or a flue insulation layer.

[0083] The heat-resistant insulating layer may be flue mica paper 321 and / or flue insulation layer. The main function of adding mica paper and insulation layer to the flue in the battery pack is to improve the safety performance of the battery pack. Mica paper has excellent high temperature resistance and can provide effective protection when the battery overheats, preventing heat from spreading to other parts of the battery pack, thereby avoiding more serious safety accidents. At the same time, mica paper also has good insulation properties, which can prevent short circuits between electrodes inside the battery pack and ensure the normal operation of the battery.

[0084] The corresponding materials may include but are not limited to the following:

[0085] Mica paper: Made from natural mica sheets through a special process, it has excellent high temperature resistance, corrosion resistance and insulation properties.

[0086] Glass fiber cloth: It has good heat resistance and insulation properties and can be used as the insulating layer material inside the battery pack.

[0087] Polyimide film: This material has extremely high temperature resistance and insulation properties, and is suitable for insulation protection of battery packs in high temperature environments.

[0088] Alumina fiber cloth: It has good high temperature resistance and insulation properties, while also providing a certain mechanical strength, and is suitable for heat insulation and insulation protection of battery packs.

[0089] By rationally selecting and using these materials, the safety performance of the battery pack can be significantly improved, ensuring the stability and reliability of the battery in various working environments.

[0090] The smoke exhaust duct 320 mentioned in the present application is surrounded by at least one layer of flue mica paper 321 and / or flue insulation layer. This design can play a role of protection and isolation, ensuring that the smoke exhaust duct 320 can still work normally in an environment of high temperature and harmful gases, thereby extending the service life of the battery pack and improving its safety. The presence of the flue mica paper 321 and the flue insulation layer can not only effectively isolate heat transfer and prevent heat from damaging other components inside the battery pack (such as undamaged battery cells 210), but also reduce the interference of the external environment on the battery pack, ensuring that the battery pack can operate stably under various complex conditions. In addition, this wrapping layer can also play a certain role in fire prevention and heat insulation, further improving the overall safety performance of the battery pack.

[0091] The flue buffer 330 includes at least one of flue foam, rubber pad, silicone pad, spring, and shrapnel. The function of the flue buffer 330 is to further reduce the vibration and noise generated during the flow of smoke and improve the stability and service life of the overall system. The flue buffer 330 can include a variety of different materials, such as flue foam, which has good sound absorption and buffering properties; rubber pads, whose elasticity can absorb part of the vibration; silicone pads, which have excellent high temperature resistance and aging resistance; springs and shrapnel, which can provide a certain elastic force during the flow of smoke and further reduce vibration and impact. The material selection of these buffers can be selected according to actual needs. One or more combinations can be used to achieve the best buffering effect.

[0092] Reference Figure 3 and Figure 4 As shown, in some examples, at least one explosion-proof valve 220 is provided on the battery cell assembly 200, and at least one exhaust inlet 322 is provided on the exhaust pipe 320, and the explosion-proof valve 220 corresponds to the exhaust inlet 322. The above structure can ensure the adaptability of the exhaust pipe 320 and the explosion-proof valve 220, and improve the exhaust effect of the battery pack.

[0093] In the present application, at least one explosion-proof valve 220 is provided on the battery cell assembly 200, and the battery cell assembly 200 may include a plurality of battery cell units 210, and each battery cell unit 210 may be provided with an explosion-proof valve 220, and these explosion-proof valves 220 may have sufficient explosion-proof functions. At the same time, at least one smoke exhaust inlet 322 may be provided on the smoke exhaust pipe 320, and the smoke exhaust inlet 322 may match the explosion-proof valve 220.

[0094] Through the above design, each explosion-proof valve 220 can correspond one-to-one with a smoke exhaust inlet 322, thereby ensuring the best adaptability between the smoke exhaust pipe 320 and the explosion-proof valve 220. It not only improves the smoke exhaust effect of the battery pack, but also ensures that the battery pack can work more safely under high temperature or abnormal conditions. Through the design of the explosion-proof valve 220, when a dangerous situation occurs in the battery pack, the explosion-proof valve 220 can be opened quickly to discharge the generated smoke and gas through the corresponding smoke exhaust inlet 322, thereby effectively preventing the risk of explosion or fire caused by excessive internal pressure of the battery pack. This design not only improves the safety performance of the battery pack, but also ensures the stability and reliability of the battery pack in various working environments.

[0095] Refer to 5 and Figure 6 As shown, in some examples, at least one group of bar pieces 230 are provided on the battery cell assembly 200, the bar pieces 230 and the explosion-proof valve 220 are on the same side of the battery cell assembly 200, the bar pieces 230 and the explosion-proof valve 220 are spaced apart, the liquid cooling pipe 420 is directly or indirectly connected to the bar pieces 230, and the liquid cooling pipe 420 and the bar pieces 230 can perform heat exchange.

[0096] The liquid cooling pipe 420 is disposed on the side of the bar 230 away from the battery cell assembly 200. Each bar 230 is connected to at least one pole, and most of the heat sources of the battery cell assembly 200 are on the pole. By cooling the bar 230, the temperature of the pole can be indirectly regulated. In turn, the temperature of the battery cell assembly 200 can be regulated.

[0097] At least one group of bars 230 is configured on the battery cell assembly 200. These bars 230 are located away from the main part of the battery cell assembly 200. The liquid cooling pipe 420 is arranged on the other side of these bars 230, specifically on the side away from the battery cell assembly 200 relative to the bars 230. At least one pole is connected to each bar 230, which is a key component in the battery cell assembly 200 and is responsible for conducting current. Since the battery cell assembly 200 generates a lot of heat during operation, and these heat sources are mainly concentrated on the poles, the temperature of the poles can be indirectly adjusted by cooling the bars 230. In this way, the overall temperature of the battery cell assembly 200 can be effectively controlled, thereby ensuring the performance and safety of the battery.

[0098] In some examples, the battery pack further includes a flexible circuit board, which is disposed between two adjacent groups of bar sheets 230, and a plurality of explosion-proof valves are disposed between the two adjacent groups of bar sheets. An escape space is disposed on the flexible circuit board, and the escape space is used to escape the explosion-proof valve and the flue assembly.

[0099] This design allows the smoke exhaust pipe 320, the liquid cooling pipe 420 and the space occupied by the flexible circuit board in the thickness direction to overlap, thereby reducing the overall space required for the flue assembly 300, the liquid cooling assembly 400 and the flexible circuit board. The compact design of the battery pack is achieved, the energy density of the battery pack is improved, and more electrical energy can be stored in a limited space.

[0100] In order to further improve the safety performance of the battery pack, the above-mentioned multiple explosion-proof valves 220 are also arranged between two adjacent groups of battery cells. The function of these explosion-proof valves 220 is to quickly release the internal pressure when an abnormal situation occurs in the battery, thereby effectively preventing potential dangers.

[0101] In order to ensure that these explosion-proof valves 220 and flue components 300 can operate smoothly in the battery pack, avoidance spaces are specially designed on the flexible circuit board. The existence of these avoidance spaces prevents the explosion-proof valves 220 and flue components 300 from being disturbed by the flexible circuit board during operation, thereby ensuring that they can perform their respective functions normally. Through this meticulous design, the overall performance of the battery pack has been significantly improved, and its safety and reliability have also been greatly enhanced.

[0102] The flexible circuit board includes a connecting body, a first detecting sub-body and a second detecting sub-body. The connecting body is provided with a connecting interface for connecting to a battery management system. The first detecting sub-body is electrically connected to one of the two groups of bars, and the second detecting sub-body is electrically connected to the other group of the two groups of bars.

[0103] The connecting body, the first detection sub-body and the second detection sub-body cooperate to form a "U"-shaped structure, and the "U"-shaped structure has a groove-shaped avoidance space.

[0104] Refer to 5 and Figure 6 As shown, in some examples, the liquid cooling pipe 420 is a harmonica plate, and at least two liquid cooling channels 422 are arranged in the harmonica plate; in the above structure, the liquid cooling pipe 420 is arranged in the shape of a harmonica plate, and at least two liquid cooling channels 422 can be arranged inside the harmonica plate. Through the design of this harmonica plate, the heat exchange performance of the liquid cooling pipe 420 is significantly improved. Such a design enables the liquid cooling pipe 420 to more efficiently exchange heat with the battery cell assembly 200, thereby significantly improving the working efficiency of the entire battery pack.

[0105] And / or, a heat conductive pad 410 is provided between the bar 230 and the liquid cooling pipe 420. The introduction of the heat conductive pad 410 in the above structure further improves the heat conductive efficiency of the bar 230. The presence of the heat conductive pad 410 allows the heat on the bar 230 to be dispersed more evenly, and the dispersed heat can be more effectively heat exchanged with the liquid cooling pipe 420. This improved heat exchange efficiency is higher, thereby further improving the heat dissipation performance of the entire battery pack.

[0106] Refer to 5 and Figure 6 As shown, in some examples, the liquid cooling pipe 420 in the battery pack is wrapped with at least one layer of liquid cooling mica paper 421 and / or liquid cooling insulation layer. This is similar to the heat-resistant insulation layer provided on the outer peripheral side of the smoke exhaust pipe 320, and will not be described here.

[0107] The liquid cooling pipe 420 mentioned in the present application is surrounded by at least one layer of liquid cooling mica paper 421 and / or liquid cooling insulation layer. This design can play a role of protection and isolation, ensuring that the liquid cooling pipe 420 can still work normally in an environment of high temperature and harmful gases, thereby extending the service life of the battery pack and improving its safety. The presence of liquid cooling mica paper 421 and liquid cooling insulation layer can not only effectively isolate heat transfer, prevent heat from dissipating in unnecessary areas, and ensure the effectiveness of heat exchange, but also reduce the interference of the external environment on the internal battery pack, ensuring that the battery pack can operate stably under various complex conditions. In addition, this wrapping layer can also play a certain role in fire prevention and heat insulation, further improving the overall safety performance of the battery pack.

[0108] As shown in FIG. 5 , in some examples, the liquid cooling assembly 400 includes a thermal pad 410 , a liquid cooling pipe 420 , and a liquid cooling buffer 430 in sequence in a direction away from the battery cell assembly 200 , and the thermal pad 410 covers the bar 230 on the battery cell assembly 200 ;

[0109] The liquid cooling pipe 420 is disposed between the thermal pad 410 and the liquid cooling buffer 430 . The liquid cooling buffer 430 is disposed with one side abutting against the smoke exhaust pipe 320 and the other side abutting against the inner wall of the accommodating chamber 110 .

[0110] The above-mentioned liquid cooling assembly 400 includes a thermal pad 410, a liquid cooling pipe 420 and a liquid cooling buffer 430 in sequence along the direction away from the battery cell assembly 200. The thermal pad 410 can be used to cover the bar 230 above the battery cell assembly 200 to ensure that heat can be effectively transferred from the battery cell assembly 200 to the thermal pad 410 through the bar 230. The liquid cooling pipe 420 can be arranged between the thermal pad 410 and the liquid cooling buffer 430, and acts as a channel for the flow of coolant. The thermal pad 410 can be heat exchanged through the liquid cooling pipe 420. One side of the liquid cooling buffer 430 is close to the exhaust pipe 320, and the other side is close to the inner wall of the accommodating chamber 110, so as to ensure that the liquid cooling assembly 400 can be stably fixed in space.

[0111] The liquid cooling assembly 400 further includes a main conduit 440 , and the plurality of liquid cooling pipes 420 are simultaneously connected to the main conduit 440 .

[0112] The design of the liquid cooling buffer 430 takes into account a variety of materials and structures to adapt to different application requirements, and may include at least one of flue foam, rubber pad, silicone pad, spring, and spring. These materials and structures can provide the necessary buffering and sealing effects to ensure that the liquid cooling system will not leak or have other problems due to vibration or pressure changes during operation. By reasonably selecting and combining the materials and structures of these buffers, the performance and reliability of the liquid cooling system can be further optimized.

[0113] The height of the explosion-proof valve 220 matches the height of the pole on the battery cell assembly 200, ensuring a perfect fit between the two, thereby significantly improving the utilization of the internal layout space of the battery pack. Through this precise matching, unnecessary space waste can be effectively reduced, making the internal structure of the entire battery pack more compact and efficient.

[0114] In addition, the opening of the explosion-proof valve 220 is matched with the smoke exhaust pipe 320, ensuring seamless connection between the two. This design enables a single smoke exhaust pipe 320 to cover multiple explosion-proof valves 220 at the same time, thereby significantly reducing the number of smoke exhaust pipes 320. Through this optimization, the utilization rate of the internal layout space of the battery pack is further improved, making the overall structure more concise and efficient.

[0115] The height of the smoke exhaust duct 320 in the direction away from the battery cell assembly 200 is higher than the preset value, ensuring the reasonable spatial layout of the smoke exhaust duct 320. At the same time, the height of the liquid cooling duct 420 is lower than the preset value, which can avoid the spatial conflict between the liquid cooling duct 420 and the smoke exhaust duct 320 and ensure that the two can coexist harmoniously. The common occupied height of the flue assembly 300 and the liquid cooling assembly 400 is within the preset range. This design further improves the utilization of space, so that the space inside the battery pack is optimized and utilized to the greatest extent.

[0116] The battery pack adopts an inverted structure. This design makes the battery pack housing 100 include a bottom guard plate, and the poles in the battery cell assembly 200 are all arranged toward the bottom guard plate. This inverted structure not only improves the stability and safety of the battery pack, but also makes the battery pack more flexible and efficient in space utilization. Through this design, the overall structure of the battery pack is more compact, and more battery cell assemblies 200 can be accommodated in a limited space, thereby improving the energy storage capacity and overall performance of the battery pack.

[0117] In a second aspect, an embodiment of the present application further provides an electrical device, including a battery pack and a device body as described above, wherein the device body is provided with a battery assembly cavity, and the battery pack is arranged in the battery assembly cavity.

[0118] The electrical equipment having the battery pack described above can reduce the space occupied by the flue assembly 300 and the liquid cooling assembly 400, make the structure of the battery pack more compact, and improve the energy density of the battery pack.

[0119] Specifically, a housing chamber 110 is provided inside the housing 100 for accommodating other components. The battery cell assembly 200 is installed in the housing chamber 110, and the housing 100 can ensure the stability and safety of the battery cell assembly 200. The flue assembly 300 is at least partially arranged in the housing chamber 110, and is located on one side of the battery cell assembly 200, so as to facilitate rapid smoke exhaust when a short circuit occurs in the battery cell assembly 200. The liquid cooling assembly 400 is also at least partially arranged in the housing chamber 110, and is on the same side of the battery cell assembly 200 as the flue assembly 300. The battery cell assembly 200 can be effectively cooled by the liquid cooling assembly 400, so that the battery cell assembly 200 can be better maintained at a suitable operating temperature.

[0120] The flue assembly 300 may include at least one exhaust pipe 320, which is used to discharge the smoke generated during the operation of the battery pack to the outside of the battery pack to ensure the cleanliness and safety of the internal environment of the battery pack. The liquid cooling assembly 400 includes at least one liquid cooling pipe 420, which is used to absorb and dissipate the heat generated by the battery cell assembly 200 during operation by circulating coolant, thereby keeping the battery pack operating within a suitable temperature range.

[0121] The smoke exhaust duct 320 and the liquid cooling duct 420 are designed to be at least partially arranged side by side in the assembly space between the battery cell assembly 200 and the inner wall of the accommodating chamber 110. This design allows the smoke exhaust duct 320 and the liquid cooling duct 420 to overlap in the thickness direction, thereby significantly reducing the overall space required for the flue assembly 300 and the liquid cooling assembly 400. In this way, the overall structure of the battery pack becomes more compact, which helps to improve the energy density of the battery pack.

[0122] Among them, the above-mentioned electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, jumping machines, etc. This application does not impose special restrictions on the above-mentioned electrical equipment.

[0123] The same or similar numbers in the drawings of this application correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0124] The above are only preferred examples of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery pack, characterized in that: The battery pack comprises: A housing having a receiving cavity; A battery cell assembly is installed in the accommodating cavity, wherein the battery cell assembly includes at least one battery cell unit, and each of the battery cell units is provided with an explosion-proof valve; A flue assembly is arranged on a side of the battery core assembly having the explosion-proof valve, at least one of the explosion-proof valves is adapted to the flue assembly, and the flue assembly includes at least one smoke exhaust pipe; A liquid cooling component is located on the same side of the battery core component as the flue component, the liquid cooling component directly or indirectly abuts against the area to be cooled of the battery core component, and the liquid cooling component includes at least one liquid cooling pipe; An assembly space is provided between the side of the battery core assembly provided with the explosion-proof valve and the inner wall of the accommodating chamber, and the smoke exhaust pipe and the liquid cooling pipe are located in the assembly space; In the direction of the opening of the explosion-proof valve, at least one of the smoke exhaust pipes and at least one of the liquid cooling pipes are distributed in parallel in the assembly space.

2. The battery pack according to claim 1, characterized in that: At least one of the smoke exhaust pipes and at least one of the liquid cooling pipes are at least partially arranged alternately.

3. The battery pack according to claim 1 or 2, characterized in that: The flue assembly further comprises a mica plate, the mica plate covers the explosion-proof valve on the battery core assembly, and the mica plate is provided with an engraved structure adapted to the explosion-proof valve, and each of the engraved structures corresponds to one of the explosion-proof valves; The smoke exhaust pipe is provided with at least one smoke exhaust inlet, the explosion-proof valve corresponds to the smoke exhaust inlet one by one, and the engraved structure is located between the smoke exhaust inlet and the explosion-proof valve.

4. The battery pack according to claim 1 or 2, characterized in that: The flue assembly further includes a flue buffer, which is located on a side of the smoke exhaust pipe away from the explosion-proof valve, one side of the flue buffer abuts against the smoke exhaust pipe, and the other side of the flue buffer abuts against the inner wall of the accommodating cavity.

5. The battery pack according to claim 1 or 2, characterized in that: The smoke exhaust duct includes a duct body and at least one heat-resistant insulation layer, wherein the at least one heat-resistant insulation layer is wrapped around the outer circumference of the duct body, and an avoidance cutout is provided in the area corresponding to the heat-resistant insulation layer and the explosion-proof valve.

6. The battery pack according to claim 1 or 2, characterized in that: At least one group of bars is arranged on the battery cell assembly, the bar plates and the explosion-proof valve are on the same side of the battery cell assembly, the bar plates and the explosion-proof valve are arranged at intervals, the liquid cooling pipe is directly or indirectly connected to the bar plates, and the liquid cooling pipe and the bar plates can perform heat exchange.

7. The battery pack according to claim 6, characterized in that: A heat conductive pad is arranged between the liquid cooling pipe and the bar.

8. The battery pack according to claim 1 or 2, characterized in that: The liquid cooling assembly includes a thermal pad, the liquid cooling pipe and a liquid cooling buffer in sequence along a direction away from the battery core assembly, and the thermal pad covers the bar on the battery core assembly; The liquid cooling pipe is arranged between the thermal pad and the liquid cooling buffer. The liquid cooling buffer is arranged so that one side thereof abuts against the smoke exhaust pipe, and the other side thereof abuts against the inner wall of the accommodating cavity.

9. The battery pack according to claim 6, characterized in that: The battery pack further includes a flexible circuit board, wherein the flexible circuit board is arranged between two adjacent groups of the bar sheets, and a plurality of explosion-proof valves are arranged between two adjacent groups of the bar sheets; An escape space is provided on the flexible circuit board, and the escape space is used to escape the explosion-proof valve and the flue component.

10. An electrical device, characterized in that: include: The battery pack according to any one of claims 1 to 9; and, The device body is provided with a battery assembly cavity, and the battery pack is arranged in the battery assembly cavity.

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