Battery pack and electric device

Abstract

The utility model relates to battery technology field discloses a kind of battery pack and electrical device, through integration acquisition module and first communication module on flexible circuit board, the voltage, temperature and so on state information of each battery monomer can be transferred to the control unit of whole vehicle by second communication module in battery protection unit wireless, completely save flexible circuit board connector in traditional link, voltage / temperature sampling wire harness, LMU unit, BMU unit and all communication wire harness between it, replace multi-stage wired topology with simple wireless scheme, significantly reduce the number of parts, assembly man-hours and wire harness copper consumption, directly reduce material cost and manufacturing cost, while improve in-pack space utilization and signal transmission reliability, provide simple, scalable technical path for electric vehicle battery system cost reduction and efficiency improvement.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] As a core component in the energy storage and conversion process, batteries occupy a pivotal position in the energy application field of today's society and are now widely and deeply used in many fields such as electric vehicles.

[0003] However, the development of the electric vehicle segment still faces some pressing practical problems. Among them, high costs are two particularly prominent factors. Objectively, the huge investments required in battery research and development, manufacturing, and vehicle integration make it difficult to significantly reduce the overall cost in the short term, which to some extent restricts the promotion and popularization of electric vehicles.

[0004] Therefore, improvements to existing technologies are necessary.

[0005] The above information is provided as background information only to aid in understanding this utility model, and does not confirm or acknowledge whether any of the above content can be used as prior art relative to this utility model. Utility Model Content

[0006] This utility model provides a battery pack and power supply device to solve the problems existing in the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] In a first aspect, this utility model provides a battery pack, including a battery box and a cell assembly, a data acquisition assembly, and a battery protection unit disposed within the battery box; wherein...

[0009] The battery cell assembly includes a plurality of battery cells, each of which has an electrode post. The acquisition component is located on the side of the battery cell assembly with the electrode post in the height direction. The acquisition component includes a flexible circuit board and an acquisition module and a first communication module integrated on the flexible circuit board.

[0010] The flexible circuit board is used to collect the status information of each battery cell through the acquisition module, and transmit the status information to the battery protection unit through the first communication module;

[0011] The battery protection unit is used to transmit the status information to the vehicle control unit through the built-in second communication module.

[0012] The first communication module is a wireless communication module, and the second communication module is either a wireless communication module or a wired communication module.

[0013] Furthermore, the battery pack also includes several connecting pieces and metal fuses;

[0014] Each battery cell is connected to the flexible circuit board via a corresponding connecting piece, and each connecting piece is provided with a corresponding metal fuse.

[0015] Furthermore, the battery pack includes an exhaust channel inside the battery box;

[0016] Each of the battery cells is provided with a battery pressure relief valve on the side of its length closest to the exhaust channel, and the battery pressure relief valve is connected to the exhaust channel through a pipeline.

[0017] Furthermore, in the battery pack, the battery pressure relief valve is located at the midpoint of the battery cell along its height direction.

[0018] Furthermore, in the battery pack, the battery box is provided with a middle beam, and the exhaust channel is formed in the middle beam;

[0019] The battery cell assemblies are respectively disposed on opposite sides of the intermediate beam;

[0020] The battery box has an air outlet corresponding to the position of the middle beam, which is connected to the exhaust channel, and the air outlet is equipped with an exhaust pressure relief valve.

[0021] Furthermore, in the battery pack, a sensor and an axial flow fan are installed in the exhaust channel;

[0022] The sensor is used to detect the pressure value in the exhaust passage and transmit the detected pressure value to the battery protection unit, which in turn transmits the pressure value to the vehicle control unit.

[0023] The axial flow fan is powered by the battery protection unit and operates under the control of the vehicle control unit when the pressure value changes.

[0024] Furthermore, in the battery pack, the battery box includes a lower box body, an upper box cover, an upper liquid cooling plate, and a lower liquid cooling plate;

[0025] The upper box cover is used to cover the lower box body;

[0026] The lower liquid cooling plate is disposed in the lower housing and is located on the side of the battery cell assembly away from the upper housing cover in the height direction;

[0027] The upper liquid cooling plate is disposed inside the upper casing cover and is located on the side of the battery cell assembly closer to the upper casing cover in the height direction.

[0028] Furthermore, in the battery pack, the battery box also includes a three-way pipe, through which the upper liquid cooling plate and the lower liquid cooling plate are connected;

[0029] The diameter of the internal flow channel of the upper liquid cooling plate is larger than the diameter of the internal flow channel of the lower liquid cooling plate, and the width of the internal flow channel of the upper liquid cooling plate is larger than the width of the internal flow channel of the lower liquid cooling plate.

[0030] Furthermore, in the battery pack, the battery box also includes upper heat insulation foam, lower heat insulation foam, adhesive sheet and thermally conductive pad;

[0031] The upper heat-insulating foam is disposed between the upper box cover and the upper liquid cooling plate;

[0032] The thermally conductive pad is disposed between the upper liquid cooling plate and the battery cell assembly;

[0033] The lower thermal insulation foam is disposed between the lower housing and the lower liquid cooling plate;

[0034] The adhesive sheet is applied to the side of the lower liquid cooling plate facing the battery cell assembly for bonding the battery cell assembly.

[0035] Secondly, this utility model provides an electrical device, including the battery pack provided in the first aspect above.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] This utility model provides a battery pack and power supply device that integrates a data acquisition module and a first communication module on a flexible circuit board. The voltage, temperature, and other status information of each battery cell can be wirelessly transmitted to the vehicle's control unit via a second communication module within the battery protection unit. This completely eliminates the need for flexible circuit board connectors, voltage / temperature sampling harnesses, LMU units, BMU units, and all communication harnesses in the traditional link. It replaces the multi-level wired topology with a simple wireless solution, significantly reducing the number of parts, assembly time, and copper consumption of the harnesses, directly reducing material and manufacturing costs. At the same time, it improves the utilization rate of space within the pack and the reliability of signal transmission, providing a simple and scalable technical path for cost reduction and efficiency improvement in electric vehicle battery systems.

[0038] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a three-dimensional structural diagram of a battery pack provided in an embodiment of the present utility model;

[0041] Figure 2 This is an exploded view of a battery pack provided in an embodiment of this utility model;

[0042] Figure 3 This is a partial structural diagram of a battery pack with the top cover removed, provided by an embodiment of this utility model;

[0043] Figure 4 It is a utility model Figure 3 Top view;

[0044] Figure 5 This is a schematic diagram of the assembly structure of the battery cell assembly and the data acquisition assembly provided in this embodiment of the utility model;

[0045] Figure 6 This is a partial structural diagram of the connection between the battery cell and the exhaust channel provided in this embodiment of the utility model;

[0046] Figure 7 This is a schematic diagram of the lower housing structure provided in an embodiment of the present utility model;

[0047] Figure 8 This is a partial structural diagram of the lower housing from another angle provided in an embodiment of the present invention;

[0048] Figure 9 This is a partial structural diagram of a battery pack provided in an embodiment of the present invention.

[0049] Reference numerals in the drawings:

[0050] Battery box 1, cell assembly 2, acquisition assembly 3, battery protection unit 4, second communication module 5, connecting piece 6, metal fuse 7, exhaust channel 8, air outlet 9, exhaust pressure relief valve 10, axial flow fan 11, three-way pipe 12.

[0051] Battery cell 201, terminal post 202, battery pressure relief valve 203;

[0052] Flexible circuit board 301, data acquisition module 302, first communication module 303;

[0053] Lower housing 101, upper housing cover 102, upper liquid cooling plate 103, lower liquid cooling plate 104, upper thermal insulation foam 105, lower thermal insulation foam 106, adhesive sheet 107, thermally conductive pad 108. Detailed Implementation

[0054] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0055] Example 1

[0056] Please refer to Figure 1-5 This utility model embodiment provides a battery pack, including a battery box 1 and a cell assembly 2, a data acquisition assembly 3, and a battery protection unit 4 disposed within the battery box 1; wherein,

[0057] The battery cell assembly 2 is composed of several individual battery cells 201. Each individual battery cell 201 is equipped with a terminal post 202, a design that provides the necessary physical interface for subsequent signal acquisition and transmission. The acquisition component 3 is carefully positioned on the side of the battery cell assembly 2 with the terminal post 202 in the height direction. This layout facilitates the efficient acquisition of relevant information from the individual battery cells 201. The acquisition component 3 includes a flexible circuit board 301, and an acquisition module 302 and a first communication module 303 integrated on the flexible circuit board 301.

[0058] The flexible circuit board 301 plays a crucial role in information acquisition and transmission. With the help of the acquisition module 302, it can collect the status information of each battery cell 201 in real time and accurately. This status information includes key parameters such as voltage and temperature. The acquired status information is then rapidly and stably transmitted to the battery protection unit 4 via the first communication module 303.

[0059] The battery protection unit 4 then plays a further role, transmitting the status information received from the acquisition component 3 to the vehicle's control unit (not shown in the figure) via its built-in second communication module 5. In this way, the vehicle control unit can monitor the real-time operating status of each battery cell 201 within the battery pack, thus providing strong support for the safe operation and efficient management of the entire vehicle.

[0060] It should be noted that in this embodiment of the present invention, the first communication module 303 is a wireless communication module, such as a common Bluetooth module; while the second communication module 5 is also flexible and can be either a wireless communication module (such as a Bluetooth module) or a wired communication module. This diverse design allows for flexible selection and configuration according to different application scenarios and actual needs.

[0061] The unique feature of this embodiment lies in the ingenious integration of the acquisition module 302 and the first communication module 303 onto the flexible circuit board 301. This enables the voltage, temperature, and other status information of each battery cell 201 to be wirelessly transmitted to the vehicle's control unit via the second communication module 5 within the battery protection unit 4. This innovative design completely eliminates the cumbersome flexible circuit board connectors, voltage / temperature sampling harnesses, LMU units, BMU units, and all communication harnesses between them found in traditional links. Replacing the multi-level wired topology with a simple and efficient wireless solution brings significant advantages in several aspects. On the one hand, it greatly reduces the number of parts, simplifies the assembly process, and effectively reduces assembly time; on the other hand, the copper consumption of the harnesses is also significantly reduced due to the reduction in the use of harnesses. These improvements are directly reflected in the reduction of material and manufacturing costs, saving enterprises a significant amount of production costs. At the same time, this design also improves the space utilization rate inside the battery pack, allowing the battery pack to integrate more functional components within a limited space, further improving the overall performance of the battery system. Furthermore, compared to wired transmission, wireless transmission reduces signal interference and attenuation during transmission, thus significantly improving signal transmission reliability. In summary, this invention provides a simple and highly scalable technical approach for cost reduction and efficiency improvement in electric vehicle battery systems, possessing broad application prospects and significant practical value.

[0062] Please refer to this again. Figure 5 In one embodiment of this invention, the battery pack also includes two important components: several connecting pieces 6 and a metal fuse 7.

[0063] Each battery cell 201 is connected to the flexible circuit board 301 via a corresponding connecting piece 6. This connection method not only ensures the reliability of the electrical connection between the battery cell 201 and the flexible circuit board 301, enabling the flexible circuit board 301 to accurately collect the status information of each battery cell 201, but also provides a basis for the installation of subsequent circuit protection measures.

[0064] More importantly, a corresponding metal fuse 7 is installed on each connecting piece 6. As a crucial circuit protection component, the metal fuse 7 responds quickly during normal battery pack operation when abnormal conditions such as overcurrent or short circuits occur. It breaks the circuit by melting itself, effectively preventing excessive current from damaging the battery cell 201, flexible circuit board 301, and other related circuit components, significantly improving the safety and stability of the entire battery pack. This design, with an individual metal fuse 7 on each connecting piece 6, provides independent protection for each battery cell 201, enabling more precise handling of potential local circuit faults and preventing cascading failures of the entire battery pack system due to localized problems. This provides a more reliable guarantee for the safe operation of the battery pack.

[0065] Please refer to this again. Figure 3-5 and in conjunction with references Figure 6 In one embodiment of this invention, the interior of the battery box 1 is carefully designed with a dedicated exhaust channel 8. This well-planned exhaust channel 8 provides crucial protection for the safe operation of the battery pack under special operating conditions.

[0066] Specifically, each battery cell 201 is equipped with a battery pressure relief valve 203 on the side of its length closest to the venting channel 8. The battery pressure relief valve 203 is a critical safety component of the battery cell 201 and plays a vital role. During normal operation of the battery cell 201, it is in a sealed state, ensuring the stable conduct of the internal chemical reactions. However, when the internal pressure of the battery cell 201 rises sharply due to internal faults, overcharging, over-discharging, or external impacts, reaching a dangerous threshold, the battery pressure relief valve 203 will automatically open.

[0067] To safely and quickly discharge high-pressure gas generated inside the battery cell 201 due to abnormal conditions, each battery pressure relief valve 203 is connected to the exhaust channel 8 through a specially designed pipeline. When a battery cell 201 experiences thermal runaway, the high-pressure gas can break through the corresponding battery pressure relief valve 203 and smoothly enter the exhaust channel 8 along the pipeline, and be discharged to the outside of the battery pack 1 through the exhaust channel 8. Each battery cell 201 is independently connected to the exhaust channel 8 through a separate pipeline, avoiding mutual impact and turbulence between the exhaust gases of other battery cells 201, ensuring that the airflow flows rapidly in one direction along a preset path, reducing exhaust resistance, and further shortening the pressure relief response time. Moreover, this design effectively prevents high-pressure gas from accumulating inside the battery pack 1, preventing serious safety accidents such as deformation, rupture, or even explosion of the battery pack 1 due to excessive pressure, greatly improving the safety and reliability of the battery pack.

[0068] Meanwhile, this design, which centrally arranges the battery pressure relief valve 203 near the exhaust channel 8 and connects it to the exhaust channel 8 via a pipeline, also has the advantages of compact structure and reasonable layout. It makes full use of the internal space of the battery box 1, reserving sufficient space for the exhaust system while ensuring the normal installation and use of the individual battery cells 201. This optimizes the overall structure of the battery pack, improving its overall performance and stability. Furthermore, this design facilitates subsequent maintenance and repair work. When it is necessary to inspect, clean, or replace the battery pressure relief valve 203 or the exhaust channel 8, personnel can operate more conveniently and quickly, reducing maintenance costs and time.

[0069] Please refer to this again. Figure 5 In one embodiment of this invention, the location of the critical safety component on the battery cell 201, namely the battery pressure relief valve 203, is further defined. Specifically, the battery pressure relief valve 203 is located at the middle position of the battery cell 201 along its height direction.

[0070] From a structural design perspective, positioning the battery pressure relief valve 203 at the midpoint of the battery cell 201's height allows it to detect internal pressure changes more promptly and effectively, even when the internal pressure distribution within the battery cell 201 is relatively uniform. When the battery cell 201 experiences pressure increases due to various abnormal operating conditions, such as overcharging, over-discharging, or internal short circuits, causing the generation of a large amount of gas, the battery pressure relief valve 203, located in the middle, can react quickly and open promptly to release the high-pressure gas inside, regardless of whether the pressure begins to accumulate at the top, middle, or bottom of the battery cell 201.

[0071] From a safety perspective, this positioning significantly enhances the overall safety of the battery pack. If the battery pressure relief valve 203 is improperly positioned, such as near the top or bottom, in the event of a malfunction in the battery cell 201, it may deform or rupture due to excessive pressure before the valve opens, potentially leading to a more serious safety incident. Positioning the battery pressure relief valve 203 in the middle ensures that gas is released before the internal pressure of the battery cell 201 reaches a dangerous level, effectively preventing excessive expansion and rupture of the battery cell 201. This also prevents high-temperature, high-pressure gas and electrolyte splashes from damaging other components within the battery pack 1, reducing the risk of serious accidents such as fires and explosions.

[0072] Furthermore, from the perspective of overall battery pack layout and space utilization, placing the battery pressure relief valve 203 in the middle of the height of the battery cell 201 has the advantage that gas generated at the upper or lower end of the battery cell 201 can be quickly discharged through the battery pressure relief valve 203 located in the middle of the battery cell 201 into the exhaust channel 8 of the battery box 1. It also facilitates a reasonable and compact layout with the exhaust channel 8 and connecting pipes. This layout makes the entire exhaust system structure simpler and smoother, reduces pipe bends and entanglements, reduces gas resistance during the exhaust process, improves exhaust efficiency, and also helps save internal space in the battery box 1, providing more possibilities for the installation and layout of other components, further improving the overall performance and integration of the battery pack.

[0073] Please refer to this again. Figure 3-4 and in conjunction with references Figure 7-9 In one embodiment of this invention, the structure of the battery box 1 is designed in an innovative and highly practical way. Specifically, a central beam is provided inside the battery box 1. This central beam is not merely a structural support component; it cleverly forms an exhaust channel 8 inside. This design, which integrates the exhaust channel 8 inside the central beam, greatly optimizes the internal space layout of the battery box 1. While ensuring the structural strength of the battery box 1, it provides a dedicated channel for gas exhaust, avoiding the additional occupation of valuable internal space.

[0074] The arrangement of the battery cell assemblies 2 within the battery box 1 is also designed, with them positioned on opposite sides of the central beam. This symmetrical layout not only facilitates a balanced distribution of the overall weight of the battery pack, improving vehicle stability, but also offers significant advantages in battery management and maintenance. For example, when inspecting or replacing the battery cell assemblies 2, staff can operate more conveniently and quickly, improving work efficiency.

[0075] To facilitate the smooth discharge of gas from inside the battery pack, the battery box 1 has a specially designed vent 9 connected to the exhaust channel 8 at the location corresponding to the intermediate beam. The location and design of the vent 9 are crucial as it serves as a key channel for gas discharge from the battery box 1. By placing it at the location corresponding to the intermediate beam, it ensures that the gas discharged from the battery pressure relief valve 203 of each individual battery cell 201 is collected through the exhaust channel 8 and then smoothly discharged to the outside of the battery box 1 through the vent 9.

[0076] More importantly, an exhaust pressure relief valve 10 is installed at the vent 9. The exhaust pressure relief valve 10 is a crucial safety protection device with precise pressure sensing and automatic opening functions. During normal operation of the battery pack, the exhaust pressure relief valve 10 is closed, effectively preventing external air, moisture, and other impurities from entering the battery box 1, ensuring the stability and sealing of the internal environment. However, when a large amount of gas is generated inside the battery pack due to factors such as a malfunction of the battery cell 201, causing the pressure in the exhaust channel 8 to rise to a certain level, the exhaust pressure relief valve 10 will automatically open, quickly and safely venting the high-pressure gas to the outside of the battery box 1. This prevents damage to the battery box 1 and its internal components due to excessive pressure, effectively preventing serious safety accidents such as fires and explosions. Once the internal pressure drops to a safe range, the exhaust pressure relief valve 10 will automatically close again, continuing to perform its sealing and protective function.

[0077] In summary, this design, which integrates the exhaust channel 8 into the intermediate beam, symmetrically arranges the battery cell components 2 on both sides of the intermediate beam, and includes an exhaust port 9 and an exhaust pressure relief valve 10, forms a complete and efficient battery pack exhaust safety system. It not only effectively and promptly removes gases generated inside the battery pack due to abnormal conditions, reducing safety risks, but also features a compact structure and reasonable layout, which helps improve the overall performance and reliability of the battery pack.

[0078] Please refer to Figure 7-9 In one embodiment of this invention, the exhaust system of the battery pack is designed with greater intelligence. Specifically, a sensor and an axial flow fan 11 are carefully installed inside the exhaust channel 8. The coordinated operation of these two key components provides dual protection for the safe operation of the battery pack.

[0079] The sensor is installed inside the exhaust channel 8, and its main function is to detect the pressure value within the exhaust channel 8 in real time and with high accuracy. For example, a thin-film pressure sensor is selected here, which features high sensitivity and high accuracy. Its unique working principle is based on the piezoresistive effect; when external pressure is applied to the thin film, the film undergoes a small but precise deformation. This deformation changes the resistance value of the bridge circuit attached to the thin film, thereby causing a change in the electrical signal. By accurately measuring this electrical signal, the pressure value within the exhaust channel 8 can be accurately obtained.

[0080] The sensor transmits the detected pressure value to the battery protection unit 4 in real time as an electrical signal. As the core control component of the battery pack, the battery protection unit 4 possesses powerful data processing and transmission capabilities. Upon receiving the pressure signal, it quickly transmits it to the vehicle control unit. The vehicle control unit, acting as the "brain" of the entire vehicle, can comprehensively analyze and process information from various components to make informed and rational decisions.

[0081] The axial flow fan 11 is also located in the exhaust channel 8 and is powered by the battery protection unit 4. This design ensures the stable operation of the axial flow fan 11. When the pressure value in the exhaust channel 8 changes, the vehicle control unit will quickly determine whether the axial flow fan 11 needs to be started based on the pressure data transmitted by the sensor.

[0082] Once the vehicle control unit determines that activation is required, it sends a control signal to start the axial flow fan 11. The axial flow fan 11 works by generating axial airflow through rotating blades, thereby achieving axial flow of air within the exhaust passage 8. This axial flow significantly accelerates the flow velocity of the gas within the exhaust passage 8, allowing the gas to be discharged more quickly through the exhaust relief valve 10 to the outside of the battery pack.

[0083] The coordinated operation of the sensor and the axial flow fan 11 forms an efficient exhaust safety mechanism. Under normal battery pack operation, the pressure in the exhaust channel 8 remains relatively stable. The sensor continuously monitors the pressure value and transmits the data to the battery protection unit 4 and the vehicle control unit. At this time, the axial flow fan 11 is in standby mode.

[0084] However, when a large amount of gas is generated inside the battery pack due to factors such as battery cell 201 malfunction, overcharging, or over-discharging, the pressure in the exhaust channel 8 will rise rapidly. The sensor will immediately detect this pressure change and transmit the abnormal pressure value to the battery protection unit 4 and the vehicle control unit. Upon receiving the signal, the vehicle control unit will quickly analyze and determine the severity of the pressure change. If the pressure rises to a certain level, the vehicle control unit will immediately control the axial flow fan 11 to start operating. The powerful axial airflow generated by the axial flow fan 11 can quickly expel the gas from the exhaust channel 8, effectively reducing the pressure inside the exhaust channel 8, preventing excessive pressure from damaging the battery pack, and avoiding serious safety accidents such as fires and explosions.

[0085] In summary, this intelligent exhaust system design not only improves the safety and reliability of the battery pack, but also allows for flexible adjustment of the exhaust strategy according to actual conditions, achieving efficient and precise control over the battery pack exhaust process.

[0086] Please refer to this again. Figure 2 In one embodiment of this invention, the structure of the battery box 1 is scientifically designed, and the whole is composed of several key parts, namely the lower box body 101, the upper box cover 102, the upper liquid cooling plate 103 and the lower liquid cooling plate 104.

[0087] The lower casing 101, as the basic load-bearing component of the battery box 1, possesses sufficient structural strength and stability, providing reliable protection and support for the battery cell assembly 2 and other related components placed inside. Its design fully considers various mechanical stresses that the battery pack may face during actual use, such as vibration and impact, ensuring that the structural integrity is maintained even under complex working conditions and preventing damage to internal components due to casing deformation.

[0088] The main function of the upper cover 102 is to cover the lower housing 101, forming a closed internal space together to safely encapsulate components such as the battery cell assembly 2. A reliable sealing design is typically used between the upper cover 102 and the lower housing 101 to prevent external moisture, dust, and other impurities from entering the battery pack 1, thereby ensuring a clean and dry internal environment and extending battery life. Simultaneously, the design of the upper cover 102 also considers lightweighting and strength requirements, minimizing its own weight while meeting structural strength requirements to reduce the overall weight of the battery pack and improve the vehicle's energy efficiency.

[0089] The lower liquid cooling plate 104 is cleverly positioned inside the lower housing 101, precisely located on the side of the cell assembly 2 away from the upper housing cover 102 in the height direction. The lower liquid cooling plate 104 typically has a flow channel structure inside, allowing the coolant to circulate within these channels. During battery pack operation, the cell assembly 2 generates a significant amount of heat. The lower liquid cooling plate 104 transfers this heat to the coolant through heat exchange with the bottom of the cell assembly 2. The coolant, carrying heat, flows out of the lower liquid cooling plate 104, is cooled by an external heat dissipation device, and then flows back to the lower liquid cooling plate 104, forming a continuous cooling cycle. This effectively controls the temperature at the bottom of the cell assembly 2, preventing performance degradation, shortened lifespan, or even safety accidents caused by excessively high temperatures.

[0090] The upper liquid cooling plate 103 is located inside the upper cover 102, on the side of the cell assembly 2 closest to the upper cover 102 in the height direction. Similar to the lower liquid cooling plate 104, the upper liquid cooling plate 103 also has flow channels for coolant flow. It absorbs the heat generated at the top of the cell assembly 2 through heat exchange with the top of the cell assembly 2, and transfers the heat to the coolant, which then carries the heat out of the battery pack 1 for heat dissipation. The upper liquid cooling plate 103 and the lower liquid cooling plate 104 work together to form a comprehensive, three-dimensional cooling system, which can dissipate heat from the cell assembly 2 more evenly and effectively, ensuring that the cell assembly 2 operates within a suitable temperature range and improving the overall performance and reliability of the battery pack.

[0091] In summary, this design, which places the upper liquid cooling plate 103 and the lower liquid cooling plate 104 in the upper cover 102 and the lower housing 101 respectively, and at different positions in the height direction of the battery cell assembly 2, makes full use of the internal space of the battery box 1, achieves efficient heat dissipation of the battery cell assembly 2, and also helps to optimize the overall structural layout of the battery pack, improve the integration and space utilization of the battery pack.

[0092] Please refer to this again. Figure 2 In one embodiment of this invention, the battery box 1 further includes a three-way pipe 12 in addition to the original lower box body 101, upper box cover 102, upper liquid cooling plate 103 and lower liquid cooling plate 104. This design brings a more efficient and reasonable layout to the liquid cooling system of the battery pack.

[0093] The three-way pipe 12 plays a crucial role in the liquid cooling system of the battery pack 1, cleverly connecting the upper liquid cooling plate 103 and the lower liquid cooling plate 104. Through the three-way pipe 12, the coolant can form a complete circulation loop between the upper and lower liquid cooling plates 103 and 104. Specifically, after flowing out from the external heat dissipation device, the coolant enters one port of the three-way pipe 12 via a specific pipe, and then flows to the upper and lower liquid cooling plates 103 and 104 respectively, according to the system design requirements. After absorbing heat from the battery cell assembly 2 inside the upper and lower liquid cooling plates 103 and 104, the coolant converges again through the other port of the three-way pipe 12 and flows back to the external heat dissipation device for cooling. This cycle repeats continuously, dissipating heat from the battery cell assembly 2 and ensuring that the battery pack remains within a suitable operating temperature range.

[0094] Furthermore, this embodiment features a carefully designed internal flow channel size for the upper liquid cooling plate 103 and the lower liquid cooling plate 104. The internal flow channel of the upper liquid cooling plate 103 is larger than that of the lower liquid cooling plate 104 in both the diameter and width, two key parameters. This differentiated design is not arbitrary but based on in-depth research into the thermal distribution characteristics of the battery pack and the heat dissipation efficiency of the liquid cooling system.

[0095] From a thermal distribution perspective, the heat distribution at the top and bottom of the battery cell assembly 2 is uneven during operation. Generally, due to the complexity of the internal chemical reactions and the uneven heat conduction of the battery cell assembly 2, the top may generate relatively more heat. Since the upper liquid cooling plate 103 is located near the top of the battery cell assembly 2, it needs to bear a greater heat dissipation burden. Therefore, designing a larger internal flow channel for the upper liquid cooling plate 103 increases the coolant flow rate. With increased coolant flow, more heat can be removed per unit time, thereby more effectively reducing the temperature at the top of the battery cell assembly 2 and preventing performance degradation and safety hazards caused by localized overheating.

[0096] The lower liquid cooling plate 104 is located near the bottom of the battery cell assembly 2. Although it absorbs some heat, its heat dissipation requirements are relatively lower compared to the top. The smaller internal flow channel size can reduce the amount of coolant used while meeting heat dissipation requirements, thus reducing the energy consumption of the liquid cooling system. At the same time, the smaller flow channel size also helps to increase the flow rate of the coolant within the flow channel, enhancing the heat exchange efficiency between the coolant and the lower liquid cooling plate 104, and further improving the heat dissipation effect.

[0097] In summary, this scheme, which differentiates the internal flow channel dimensions of the upper liquid cooling plate 103 and the lower liquid cooling plate 104 based on the varying heat dissipation requirements of different parts of the battery cell assembly 2, fully demonstrates the scientific and rational nature of the battery pack liquid cooling system design in this embodiment. It not only achieves precise heat dissipation for the battery cell assembly 2 and improves the overall heat dissipation efficiency of the battery pack, but also optimizes the energy consumption of the liquid cooling system and reduces operating costs.

[0098] Please refer to this again. Figure 2 In one embodiment of this invention, the battery box 1 of the utility model is further equipped with several key components, namely upper heat insulation foam 105, lower heat insulation foam 106, adhesive board 107 and thermal conductive pad 108, based on the original structure. The synergistic effect of these components provides comprehensive protection for the safe and stable operation of the battery pack.

[0099] The upper thermal insulation foam 105 is cleverly positioned between the upper cover 102 and the upper liquid cooling plate 103. During battery pack operation, the coolant in the upper liquid cooling plate 103 absorbs heat generated at the top of the battery cell assembly 2, causing its own temperature to rise. If this heat is directly transferred to the upper cover 102, it may cause the upper cover 102 to overheat, thus affecting the overall performance and safety of the battery pack. The upper thermal insulation foam 105, with its excellent thermal insulation properties, effectively blocks the heat transferred from the upper liquid cooling plate 103 to the upper cover 102, acting as a solid thermal barrier. This firmly confines the heat to the area at and below the upper liquid cooling plate 103, preventing the upper cover 102 from deforming or aging due to excessive temperature, thereby extending the service life of the upper cover 102 and ensuring the structural integrity of the battery pack.

[0100] The thermally conductive pad 108, located between the upper liquid cooling plate 103 and the battery cell assembly 2, plays a crucial role in heat conduction. The battery cell assembly 2 generates a significant amount of heat during operation, which needs to be dissipated promptly and effectively to maintain its normal operating temperature. The thermally conductive pad 108, with its excellent thermal conductivity, adheres tightly to the surfaces of both the upper liquid cooling plate 103 and the battery cell assembly 2, filling the tiny gaps between them and reducing thermal resistance. Through the thermally conductive pad 108, the heat generated at the top of the battery cell assembly 2 can be rapidly and efficiently transferred to the upper liquid cooling plate 103, where the coolant carries the heat away, achieving rapid heat dissipation for the battery cell assembly 2. This efficient heat conduction mechanism helps maintain the temperature uniformity of the battery cell assembly 2, preventing localized overheating and improving its performance and reliability.

[0101] The lower insulating foam 106 is positioned between the lower housing 101 and the lower liquid cooling plate 104. Its function is similar to that of the upper insulating foam 105, but it targets heat transfer from the lower part. After absorbing heat generated at the bottom of the battery cell assembly 2, the temperature of the lower liquid cooling plate 104 also rises. If this heat is directly conducted to the lower housing 101, it may adversely affect the lower housing 101, especially under extreme conditions. Excessive temperature may cause a decrease in the material performance of the lower housing 101, or even lead to safety hazards. The lower insulating foam 106 effectively reduces heat conduction from the lower liquid cooling plate 104 to the lower housing 101, lowers the temperature of the lower housing 101, protects the structure and performance of the lower housing 101, and ensures stable operation of the battery pack under various environments.

[0102] An adhesive sheet 107 is applied to the side of the lower liquid cooling plate 104 facing the cell assembly 2, and its main function is to bond the cell assembly 2. During the battery pack assembly process, it is crucial to securely fix the cell assembly 2 to the lower liquid cooling plate 104. The adhesive sheet 107 has excellent adhesive properties, forming a strong bond between the cell assembly 2 and the lower liquid cooling plate 104, ensuring that the cell assembly 2 will not shift or loosen due to vibration, impact, or other factors during vehicle operation. This robust bonding method not only helps maintain the stability of the battery pack's internal structure but also improves the overall shock resistance of the battery pack, reducing safety issues such as short circuits and damage that may be caused by the shaking of the cell assembly 2, thus providing a reliable guarantee for the safe operation of the battery pack.

[0103] In summary, the upper heat insulation foam 105, the lower heat insulation foam 106, the adhesive sheet 107, and the thermally conductive pad 108 in the battery box 1 of this embodiment each perform their respective functions and work together to build an efficient, safe, and stable internal environment for the battery pack, providing solid technical support for the reliable operation of electric vehicles.

[0104] Although this utility model uses terms such as upper cover, lower casing, and battery cell assembly frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

[0105] Example 2

[0106] This utility model provides a second embodiment of an electrical device, including a battery pack as described in the first embodiment above.

[0107] It should be noted that the electrical device is powered by the battery pack formed by connecting several individual battery cells in parallel or series.

[0108] It is understandable that an electrical device, in addition to a battery pack for providing electrical energy, should also include an object that receives electrical energy, namely the electrical user. The battery pack is connected to the electrical user, and the electrical user can perform the set functions under the drive of electrical energy.

[0109] The electrical devices applicable to the use of the battery pack described in this embodiment can take many forms, such as electric vehicles, unmanned aerial vehicles, power tools, etc. Power tools include metal cutting power tools, cleaning tools, such as electric drills, electric wrenches, vacuum cleaners, robot vacuum cleaners, etc. This application embodiment does not impose any special limitations on the above-mentioned electrical devices.

[0110] Because the battery pack provided in this embodiment has excellent electrical performance, it is beneficial for the electrical device to be used in outdoor energy storage, short-term backup power and mobile energy storage applications, thus making the application scenarios of the electrical device more extensive.

[0111] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this utility model, this should not limit the scope of patent protection of this utility model. Any technical solutions resulting from equivalent structural or procedural substitutions or modifications made based on the essential concept of this utility model and utilizing the content described in the text and drawings of this utility model, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this utility model.

Claims

1. A battery pack, characterized in that, It includes a battery box (1) and a cell assembly (2), a data acquisition assembly (3), and a battery protection unit (4) disposed within the battery box (1); wherein, The battery cell assembly (2) includes a plurality of battery cells (201), each of the battery cells (201) having a terminal post (202), and the acquisition component (3) is disposed on the side of the battery cell assembly (2) having the terminal post (202) in the height direction; the acquisition component (3) includes a flexible circuit board (301) and an acquisition module (302) and a first communication module (303) integrated on the flexible circuit board (301). The flexible circuit board (301) is used to collect the status information of each battery cell (201) through the acquisition module (302) and transmit the status information to the battery protection unit (4) through the first communication module (303). The battery protection unit (4) is used to transmit the status information to the vehicle control unit through the built-in second communication module (5); The first communication module (303) is a wireless communication module, and the second communication module (5) is a wireless communication module or a wired communication module.

2. The battery pack according to claim 1, characterized in that, It also includes several connecting pieces (6) and metal fuses (7); Each of the battery cells (201) is connected to the flexible circuit board (301) via a corresponding connecting piece (6), and each connecting piece (6) is provided with a corresponding metal fuse (7).

3. The battery pack according to claim 1, characterized in that, The battery box (1) is provided with an exhaust channel (8); Each of the battery cells (201) is provided with a battery pressure relief valve (203) on one side of its length near the exhaust channel (8), and the battery pressure relief valve (203) is connected to the exhaust channel (8) through a pipeline.

4. The battery pack according to claim 3, characterized in that, The battery pressure relief valve (203) is located at the middle position of the battery cell (201) along its height direction.

5. The battery pack according to claim 3, characterized in that, The battery box (1) is provided with a middle beam, and the exhaust channel (8) is formed in the middle beam. The battery cell assembly (2) is respectively disposed on opposite sides of the intermediate beam; The battery box (1) has an air outlet (9) connected to the exhaust channel (8) at the position corresponding to the middle beam, and the air outlet is equipped with an exhaust pressure relief valve (10).

6. The battery pack according to claim 3, characterized in that, The exhaust channel (8) is equipped with a sensor and an axial flow fan (11). The sensor is used to detect the pressure value in the exhaust channel (8) and transmit the detected pressure value to the battery protection unit (4), which in turn transmits the pressure value to the vehicle control unit. The axial flow fan (11) is powered by the battery protection unit (4) and is used to operate under the control of the vehicle control unit when the pressure value changes.

7. The battery pack according to claim 1, characterized in that, The battery box (1) includes a lower box body (101), an upper box cover (102), an upper liquid cooling plate (103) and a lower liquid cooling plate (104). The upper box cover (102) is used to cover the lower box body (101). The lower liquid cooling plate (104) is disposed inside the lower housing (101) and is located on the side of the battery cell assembly (2) away from the upper housing cover (102) in the height direction; The upper liquid cooling plate (103) is disposed inside the upper box cover (102) and is located on the side of the battery cell assembly (2) close to the upper box cover (102) in the height direction.

8. The battery pack according to claim 7, characterized in that, The battery box (1) also includes a three-way pipe (12), through which the upper liquid cooling plate (103) and the lower liquid cooling plate (104) are connected; The diameter of the internal flow channel of the upper liquid cooling plate (103) is greater than the diameter of the internal flow channel of the lower liquid cooling plate (104), and the width of the internal flow channel of the upper liquid cooling plate (103) is greater than the width of the internal flow channel of the lower liquid cooling plate (104).

9. The battery pack according to claim 7, characterized in that, The battery box (1) also includes an upper heat insulation foam (105), a lower heat insulation foam (106), an adhesive board (107), and a thermally conductive pad (108). The upper heat insulation foam (105) is disposed between the upper box cover (102) and the upper liquid cooling plate (103); The thermally conductive pad (108) is disposed between the upper liquid cooling plate (103) and the battery cell assembly (2); The lower thermal insulation foam (106) is disposed between the lower housing (101) and the lower liquid cooling plate (104); The adhesive plate (107) is applied to the side of the lower liquid cooling plate (104) facing the cell assembly (2) for bonding the cell assembly (2).

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

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