Battery pack structure of solid sodium battery

Abstract

The utility model discloses a battery pack structure of a solid sodium battery. The battery pack structure comprises an outer box assembly, a heat preservation assembly, an inner box assembly, a plurality of heat preservation layers, a heater, a heat insulation assembly, a battery core assembly and a main busbar leading-out assembly, the heat preservation assembly is arranged in the outer box assembly, the inner box assembly is arranged in the heat preservation assembly, the battery cell assembly is arranged in the inner box assembly, the heat insulation assembly, the heater and the heat preservation layers are sequentially arranged on the top of the battery cell assembly and installed in the outer box assembly, and the total busbar leading-out assembly is arranged on the surface of the battery cell assembly. And the battery is electrically connected with the battery core assembly.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and in particular to a battery pack structure for a solid sodium battery. Background Technology

[0002] Sodium-sulfur batteries and sodium salt batteries offer advantages such as high safety, high specific energy, high charge-discharge efficiency, and low cost, making them excellent electrochemical energy storage power sources. Sodium-sulfur batteries are a type of high-temperature sodium battery, a molten salt battery composed of liquid sodium and sulfur. They feature high energy density, high charge-discharge efficiency, long cycle life, and are manufactured using inexpensive and non-toxic materials, primarily for stationary energy storage. Sodium salt batteries, also a type of high-temperature sodium battery, are characterized by stable product properties, high safety (intrinsically safe cells), long service life, wide application range, readily available and non-toxic raw materials, and simple and pollution-free waste recycling processes. They have been applied in 25 countries worldwide, used in energy storage projects such as solar and wind power integration, peak management, and communication base stations.

[0003] The main reason currently limiting the development of sodium-sulfur batteries is safety; while the main limitations on sodium salt batteries are cost, maintainability, easy leakage of vacuum insulation layers, and the need for high temperatures during use. Therefore, there is an urgent need to solve the cost and reliability issues of high-temperature sodium batteries, and to develop a product series to facilitate their widespread application.

[0004] To address the problems in related technologies, this utility model provides a battery pack structure for a solid sodium battery. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a battery pack structure for a solid-state sodium battery.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A battery pack structure for a solid sodium battery includes an outer casing assembly, an insulation assembly, an inner casing assembly, several insulation layers, a heater, a thermal insulation component, a cell assembly, and a main busbar lead-out assembly.

[0008] The insulation assembly is located inside the outer casing assembly, the inner casing assembly is located inside the insulation assembly, the battery cell assembly is located inside the inner casing assembly, the thermal insulation component, the heater, and several insulation layers are sequentially located on top of the battery cell assembly and installed inside the outer casing assembly, and the main busbar lead-out component is located on the surface of the battery cell assembly and is electrically connected to the battery cell assembly.

[0009] Furthermore, the battery cell assembly includes multiple battery cells, a rear insulating plate, side insulating plates, spacer insulating plates, a bottom insulating plate, and rear elastic high-temperature resistant insulation cotton. Side insulating plates are fixedly installed on both sides of the bottom insulating plate. The bottom of the rear insulating plate is fixedly connected to the bottom insulating plate, and both sides of the rear insulating plate are fixedly connected to the side insulating plates. The rear elastic high-temperature resistant insulation cotton is disposed on the back of the rear insulating plate, thereby forming a square structure with a top and front opening and a hollow interior. Multiple battery cells are disposed within the square structure, and spacer insulating plates are disposed between the multiple battery cells.

[0010] Furthermore, the main busbar lead-out assembly includes an insulating ceramic block, a positive busbar, a negative busbar, and an insulating layer assembly; the insulating layer assembly is installed on the surface of the cell assembly, the insulating ceramic block is installed on the insulating layer assembly, the positive busbar and the negative busbar are installed on the insulating ceramic block, and the positive busbar and the negative busbar are also electrically connected to the positive and negative poles of the cell assembly.

[0011] Furthermore, the outer casing assembly includes an upper cover and a lower casing, with the lower casing located below the upper cover and fixedly connected to it. A sealing strip is also provided between the upper cover and the lower casing.

[0012] Furthermore, the lower housing surface is also provided with several welding screws, which are connected to the BMS battery management system.

[0013] Furthermore, the insulation assembly and several insulation layers all contain insulation material, which is a nanomaterial, and the thickness of the insulation material is 1mm to 200mm, with a temperature resistance range of 25℃ to 1000℃.

[0014] Furthermore, the heating plate is a specially designed thin-film heater that is resistant to high temperatures.

[0015] Furthermore, the plurality of cells are cells connected in series with N cells and in parallel with M cells, where N = 1 to 10 and M = 1 to 10.

[0016] Furthermore, handles are provided on both sides of the lower housing.

[0017] Furthermore, square holes are provided on the surfaces of the lower housing, the insulation assembly, and the inner housing assembly.

[0018] Compared with existing technologies, this invention is widely used in high-temperature sodium batteries, especially sodium-sulfur batteries and sodium salt batteries. This sodium battery pack has advantages such as simple manufacturing, low raw material and manufacturing costs, high maintainability, and higher reliability due to the absence of a vacuum insulation device, thus eliminating leakage problems. Furthermore, it can be developed into a product series, which is beneficial for product promotion and application. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the battery pack structure and BMS battery management system of a solid sodium battery provided in Embodiment 1;

[0020] Figure 2 This is a battery pack structure diagram of a solid sodium battery provided in Example 1;

[0021] Figure 3 This is a cross-sectional view of the battery pack structure of a solid sodium battery provided in Embodiment 1;

[0022] Figure 4 This is an exploded view of the battery pack structure of a solid sodium battery provided in Example 1;

[0023] Figure 5 This is a structural diagram of the outer casing assembly provided in Embodiment 1;

[0024] Figure 6 This is a structural diagram of the sealing strip provided in Example 1;

[0025] Figure 7 This is a structural diagram of the thermal insulation assembly provided in Example 1;

[0026] Figure 8 This is a structural diagram of the inner box assembly provided in Embodiment 1;

[0027] Figure 9 These are structural diagrams of several insulation layers provided in Example 1;

[0028] Figure 10 This is a structural diagram of the heater provided in Embodiment 1;

[0029] Figure 11 This is a structural diagram of the heat insulation component provided in Embodiment 1;

[0030] Figure 12 These are cross-sectional views of several insulation layers, heaters, and thermal insulation components provided in Embodiment 1;

[0031] Figure 13 This is a structural diagram of the battery cell assembly provided in Embodiment 1;

[0032] Figure 14 This is an exploded view of the battery cell assembly provided in Example 1;

[0033] Figure 15 This is a structural diagram of the main busbar lead-out component provided in Embodiment 1;

[0034] Figure 16 This is an exploded view of the main busbar lead-out assembly provided in Embodiment 1;

[0035] The components include: 1. Outer casing assembly; 11. Top cover; 12. Lower casing; 13. Sealing strip; 14. Welding screw; 2. Insulation assembly; 3. Inner casing assembly; 4. Several insulation layers; 5. Heater; 6. Thermal insulation component; 7. Cell assembly; 71. Cell; 72. Rear insulation board; 73. Side insulation board; 74. Spacer insulation board; 75. Bottom insulation board; 76. Rear elastic high-temperature resistant insulation cotton; 8. Main busbar lead-out assembly; 81. Insulating ceramic block; 82. Positive busbar; 83. Negative busbar; 84. Insulation layer assembly; 9. Handle; 10. BMS battery management system; A. Square hole. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0037] The purpose of this invention is to address the shortcomings of existing technologies by providing a battery pack structure for a solid-state sodium battery.

[0038] Example 1

[0039] This embodiment provides a battery pack structure for a solid-state sodium battery, such as... Figure 1-4 As shown, it includes an outer casing assembly 1, an insulation assembly 2, an inner casing assembly 3, several insulation layers 4, a heater 5, a thermal insulation component 6, a battery cell assembly 7, and a main busbar lead-out assembly 8;

[0040] The insulation assembly 2 is located inside the outer casing assembly 1, the inner casing assembly 3 is located inside the insulation assembly 2, the battery cell assembly 7 is located inside the inner casing assembly 3, the thermal insulation component 6, the heater 5, and several insulation layers 4 are sequentially located on the top of the battery cell assembly 4 and installed inside the outer casing assembly 1, and the main busbar lead-out component 8 is located on the surface of the battery cell assembly 7 and is electrically connected to the battery cell assembly 4.

[0041] like Figure 5 As shown, the outer casing assembly 1 includes an upper cover 11, a lower casing 12, and a sealing strip 13.

[0042] The upper cover 11 has a cuboid structure with a groove in the center for placing the sealing strip 13, and rivet holes or other fastener holes around its perimeter for connecting to the lower housing. Its shape and size should match the lower housing 12 to ensure a tight fit. The material of the upper cover 11 needs to have certain strength and high-temperature resistance; it can be made of metal, such as stainless steel, to ensure stability and safety in high-temperature environments. The upper cover 11 protects the internal battery components, preventing external environmental influences on the battery pack. Together with the lower housing 11, it forms the overall outer shell of the battery pack, ensuring its structural integrity.

[0043] The lower housing 12 is cuboid in shape, with internal space to accommodate other battery components. Its shape and dimensions should match the upper cover 11 to ensure a tight fit. The material of the lower housing 12 needs to have sufficient strength and high-temperature resistance; generally, metal materials such as stainless steel can be used to ensure stability and safety in high-temperature environments. The lower housing 12 is located at the bottom of the battery pack and is connected to the upper cover 11 by rivets or other fasteners, together forming the overall outer shell of the battery pack. The function of the lower housing 12 is to support and protect the internal battery components, providing a stable mounting base for the battery pack, and together with the upper cover 11, forming a sealed shell to prevent external environmental influences on the battery pack.

[0044] The lower housing 12 also has eight welding screws 14 on its surface for fixing the BMS battery management system 10 to the front of the lower housing 12 via the welding screws 14. The BMS battery management system 10 not only controls voltage, current, and temperature, but also has dedicated DC-DC functions, active balancing, isolation circuits, etc. Furthermore, there is an elastic sealing material between the BMS battery management system 10 and the battery pack, which can effectively ensure that the product meets IP55, IP66, IP67, etc.

[0045] like Figure 6 As shown, the sealing strip 13 is elongated and elastic, with a cross-section that may be rectangular, circular, or other shapes. Its size and shape should match the gap between the upper cover 11 and the lower housing 12 to ensure a good seal. The sealing strip 13 is typically made of elastic materials such as rubber, possessing good high-temperature resistance and chemical corrosion resistance. It maintains its elasticity even at high temperatures, effectively preventing dust and moisture from entering the battery pack. The sealing strip 13 is located between the upper cover 11 and the lower housing 12. When the upper cover 11 is connected to the lower housing by rivets or other fasteners, the sealing strip 13 is compressed between them, providing a seal. The main function of the sealing strip 13 is to prevent external dust and moisture from entering the battery pack, ensuring a clean and dry internal environment and improving the reliability and safety of the battery pack.

[0046] In this embodiment, handles 9 are typically provided on both side panels of the lower housing 12 by welding or other fixing methods. The handles 9 are arc-shaped or elongated, ergonomically designed for easy gripping and application of force. Their size and shape should be designed according to the weight of the battery pack and usage requirements to ensure they can support the weight of the battery pack and facilitate handling. The handles 9 are generally made of metal, such as stainless steel, possessing sufficient strength and durability to withstand the weight of the battery pack (over 150 kg) and external forces during handling.

[0047] like Figure 7 As shown, the insulation assembly 2 may consist of multiple insulation layers, with a rectangular shape matching the internal space of the battery pack. It has a certain thickness to provide good insulation. The insulation assembly 2 is divided into outer and inner layers, and there may be adhesive layers or other connecting structures between the layers. The material of the insulation assembly 2 is a nanomaterial or other material with excellent insulation properties, capable of maintaining good insulation over a wide temperature range. Its thickness is generally 1–200 mm, and its temperature resistance range is generally 25℃–1000℃. The insulation assembly 2 is tightly connected to the lower casing 12 by adhesive or other fixing methods, providing insulation for the cell assembly. Its position and shape should be designed according to the internal layout of the battery pack to ensure effective insulation of the cell assembly. The main function of the insulation assembly 2 is to reduce heat loss inside the battery pack, maintain the operating temperature of the battery pack, improve the charging and discharging efficiency and cycle life of the battery pack, and also contribute to improving the safety of the battery pack.

[0048] like Figure 8 As shown, the inner casing assembly 3 is cuboid in shape, with internal space to accommodate the cell assembly and other components. Its size and shape should match the internal layout of the battery pack. The inner casing assembly 3 may have a certain thickness and strength to ensure its function as a good conductor of electrons. The material of the inner casing assembly 3 is a good conductor of electrons, generally a metallic material such as copper or aluminum, which has good electrical conductivity and mechanical strength. The inner casing assembly 3 is installed inside the insulation assembly 2 by welding or other connection methods, located around the cell assembly, and tightly attached to the cell assembly by welding or other connection methods. Its position should facilitate the connection of the inner casing sensor wire to the BMS battery management system 10, so that in case of abnormalities such as cell leakage, the signal can be sent to the BMS through the inner casing sensor wire, thereby realizing alarm and timely handling, and improving the safety of the battery pack.

[0049] like Figure 9 , 12As shown, the insulation layers 4 include four insulation layers, each typically cuboid in shape. The size and shape of each insulation layer are designed according to the internal layout of the battery pack to ensure a tight fit with the cell assembly and other components. The thickness of each insulation layer 4 is generally between 1 and 200 mm to provide sufficient insulation. Each insulation layer 4 is made of nanomaterials or other materials with excellent insulation properties, capable of maintaining good insulation performance in high-temperature environments, with a temperature resistance range generally between 25℃ and 1000℃. The four insulation layers are sequentially installed on top of the cell assembly 7 using adhesives or other fixing methods to provide insulation. Each insulation layer 4 may be connected to the others using adhesives or other fixing methods to form a unified insulation system. The main function of each insulation layer 4 is to reduce heat loss within the battery pack, maintain the battery pack's operating temperature, improve the battery pack's charge / discharge efficiency and cycle life, and also contribute to improving the battery pack's safety.

[0050] like Figure 10 , 12 As shown, the heater 5 is typically sheet-like or film-like in shape, possessing a certain degree of flexibility. The heater 5 is positioned between the bottommost insulation layer 4 and the thermal insulation component 6. The size and shape of the heater 5 should match the upper surface of the battery cell assembly 7 to ensure uniform heating. The heater 5 is made of high-temperature resistant heating materials, such as specially designed thin-film heating elements, enabling stable operation in high-temperature environments, uniform heating, and high safety. The heater 5 is connected to the battery pack's control system via wires for heating control as needed. The main function of the heater 5 is to rapidly raise and maintain the battery pack within the operating temperature range of 260℃ to 350℃ when the battery pack's operating temperature is low, ensuring normal charge / discharge performance and cycle life of the battery pack.

[0051] like Figure 11-12 As shown, the thermal insulation component 6 is typically plate-shaped or sheet-shaped, with a certain thickness and strength, serving both thermal and electrical insulation functions. Its size and shape should be designed according to the internal layout of the battery pack to ensure a tight fit with the cell assembly 7 and heater 5; that is, the thermal insulation component 6 is installed between the cell assembly 7 and heater 5 by bonding or other fixing methods. The material of the thermal insulation component 6 is generally mica board, fiberglass board, ceramic fiber cotton, or other materials with good thermal and electrical insulation properties, capable of remaining stable in high-temperature environments. The main function of the thermal insulation component 6 is to prevent heat transfer between the cells, reduce heat loss, and simultaneously ensure the insulation level between the cells and the inner casing assembly, thereby improving the safety and reliability of the battery pack.

[0052] like Figure 13-14As shown, the battery cell assembly 7 is typically rectangular in shape and includes multiple battery cells 71, a rear insulating plate 72, a side insulating plate 73, a spacer insulating plate 74, a bottom insulating plate 75, and a rear elastic high-temperature resistant insulation cotton 76.

[0053] Side insulating plates 73 are fixedly installed on both sides of the bottom insulating plate 72 by welding or other means. The bottom of the rear insulating plate 75 is fixedly connected to the bottom insulating plate 72 by welding or other means. The two sides of the rear insulating plate are fixedly connected to the side insulating plates 73 by welding or other means. The rear elastic high-temperature resistant insulation cotton 76 is set on the back of the rear insulating plate 76 by welding or other means, thus forming a square structure with a top and front opening and a hollow interior. Multiple battery cells 71 are set in the square structure. The spacer insulating plate 72 is set between the multiple battery cells 71 by welding or other means.

[0054] Multiple battery cells 71 are combined in a series-connected, parallel-connected (N = 1–10, M = 1–10) configuration. The cells 71 are connected by connecting tabs. The arrangement and connection structure of the cells 71 should be optimized according to the battery pack design requirements to achieve different voltage and capacity specifications. For example, to achieve multiple combinations in a 10-series-10-parallel configuration (allowing for multiple capacity specifications), some empty cell shells need to be filled internally; the number of empty shells ranges from 0 to 20. The materials of the cells 71 are the electrode and electrolyte materials of sodium-sulfur batteries or sodium salt batteries, featuring high specific energy and high charge / discharge efficiency. The connecting tabs are generally made of highly conductive metals, such as nickel or stainless steel.

[0055] The cells in this embodiment can be adapted to different application scenarios of the battery pack by different series and parallel connections. For example, under high voltage conditions, the number of cells connected in series can be increased; under high current conditions, the number of cells connected in parallel can be increased.

[0056] The cell assembly 7 is installed inside the inner casing assembly 3, and its top consists of, in sequence, a thermal insulation component 6, a heater 5, and four insulation layers 4, which are tightly connected to the heater 5 and the main busbar lead-out assembly 8. The cells are connected in series or parallel via connecting tabs to form the required circuit structure. The cell assembly 7 is the core component of the battery pack, responsible for storing and releasing electrical energy, providing the power source for the battery pack. Different series and parallel combinations can adapt to different application scenarios and power requirements.

[0057] like Figure 15-16As shown, the main busbar lead-out assembly 8 includes an insulating ceramic block 81, a positive busbar 82, a negative busbar 83, and an insulating layer assembly 84. The insulating layer assembly 84 is installed on the surface of the cell assembly 7 by welding or other connection methods. The insulating ceramic block 81 is installed on the insulating layer assembly 84. The positive busbar 82 and the negative busbar 83 are installed on the insulating ceramic block 81, and the positive busbar 82 and the negative busbar 83 are also electrically connected to the positive and negative poles of the cell assembly 7.

[0058] The insulating ceramic block 81 has multiple wiring slots for insulation between the positive busbar 82 and the negative busbar 83, voltage measurement line routing, heater 5 wire routing, and insulation measurement lines. This insulating layer has a maximum temperature resistance of 1000℃. The shape and size of the positive busbar 82 and the negative busbar 83 should be designed according to the current output requirements of the battery pack, and are generally plate-shaped or sheet-shaped. The insulating ceramic block 81 is made of ceramic material with good insulation and high temperature resistance. The positive busbar 82 and the negative busbar 83 are generally made of metal material with good conductivity, such as nickel plate or stainless steel plate. The insulating layer assembly 84 is made of high temperature resistant insulating material, such as mica board. The main function of the main busbar lead-out assembly 8 is to realize the overall lead-out of the positive and negative terminals of the battery pack, to combine the electrical energy of the cell assembly 7 for external output, and to charge the internal components. At the same time, the insulating ceramic block 81 and other components achieve insulation between the positive and negative terminals, between measurement lines, and between heater lines, ensuring the safe operation of the battery pack.

[0059] In this embodiment, a square hole A that is compatible with the insulating ceramic block 81 is provided at the corresponding positions of the lower housing 12, the thermal insulation assembly 2, and the inner housing assembly 3, so that the insulating ceramic block 81 passes through the square hole and A is electrically connected to the BMS battery management system 10.

[0060] During assembly, the lower housing 12 is first placed on the assembly table, and then the insulation assembly 2, inner housing assembly 3, battery cell assembly 7, main busbar lead-out assembly 8, heat insulation assembly 6, heater 5, and four insulation layers 4 are placed in sequence. Finally, the upper cover 11 and the lower housing 12 are fixed together with rivets or other fasteners, and the upper cover 11 and the lower housing 12 are provided with sealing strips 13.

[0061] This utility model has the following beneficial effects:

[0062] 1. High security:

[0063] Leakage detection of the inner casing assembly: As a good conductor of electricity, the inner casing assembly can promptly alarm when the battery cell leaks through the sensor line, which facilitates rapid handling of abnormal situations and effectively prevents the accident from escalating.

[0064] Thermal insulation components and insulation assemblies: Thermal insulation components and insulation assemblies are used to reduce heat loss while preventing heat transfer between cells, thereby reducing the risk of thermal runaway and ensuring that the battery pack operates within a safe temperature range.

[0065] 2. Significant cost-effectiveness:

[0066] Low raw material cost: The use of low-cost materials effectively controls the raw material cost of the battery pack.

[0067] Low manufacturing cost: The overall design is simple, the number of parts is small, and the assembly process is simple, which greatly reduces the manufacturing cost in the production process.

[0068] High maintainability: The battery pack structure is designed to facilitate maintenance and component replacement, reducing maintenance costs and difficulty, extending service life, and further improving cost-effectiveness.

[0069] 3. High reliability:

[0070] Excellent sealing performance: The top cover and the lower casing are connected by fasteners such as rivets, and the compression sealing strip forms a good seal, meeting the requirements for dust and water protection, adapting to harsh environments, and enhancing the reliability and durability of the battery pack.

[0071] Excellent thermal insulation: The thermal insulation assembly and insulation layer are made of nanomaterials, which have excellent thermal insulation performance, effectively maintaining the operating temperature of the battery pack, reducing energy consumption, and improving reliability and efficiency.

[0072] Stable heater performance: The heater uses a special thin-film heating element that is resistant to high temperatures and provides uniform heating, ensuring that the battery pack quickly and stably reaches the operating temperature and improving reliability and performance in low-temperature environments.

[0073] 4. Strong applicability and scalability:

[0074] Multiple series and parallel combinations: The cell assembly supports different series and parallel combinations to meet the needs of various application scenarios, such as high voltage or high current scenarios. Different voltage and capacity specifications can be achieved by adjusting the combination method, making it widely applicable.

[0075] Product serialization: The overall design facilitates the formation of product series, which is conducive to large-scale promotion and application, meets the needs of different customers and markets, and promotes the development and market expansion of high-temperature sodium battery technology.

[0076] 5. Reasonable structural design:

[0077] Easy assembly: The components are reasonably designed and the connection methods are simple and reliable, such as the rivet connection between the top cover and the lower box, and the tight fit between the thermal insulation assembly and the heat insulation component, which makes the entire battery pack assembly process efficient and convenient, improves production efficiency and ensures assembly quality.

[0078] Optimized spatial layout: The internal structure is compact and the layout of each component is reasonable, making full use of space. This makes the battery pack compact and small in size, which is easy to install and use in different devices and systems, improving space utilization efficiency and system integration.

[0079] 6. Good protection and environmental adaptability:

[0080] Handle design for easy handling: The handles on both sides have strong load-bearing capacity, are ergonomic, facilitate the handling and movement of battery packs, improve operational convenience, and reduce labor intensity.

[0081] Comprehensive protection features: The BMS and battery pack are sealed with elastic material, which enables the product to achieve a high level of protection, effectively preventing the influence of external environmental factors and enhancing the reliability and stability of the battery pack in harsh environments.

[0082] Example 2

[0083] The battery pack structure of the solid-state sodium battery provided in this embodiment differs from that in Embodiment 1 in that:

[0084] This embodiment uses a configuration of 2 parallel and 12 series cells as an example for illustration.

[0085] Preparation phase: Ensure the assembly table is clean and tidy, and prepare all necessary components and tools, including the lower enclosure, insulation assembly, inner enclosure assembly, 4 insulation layers, heater, thermal insulation components, 24 battery cells, connecting pieces, laser welding equipment, main busbar lead-out components, internal measuring lines, upper cover assembly, rivets, etc.

[0086] Placement of the lower enclosure: The lower enclosure assembly is precisely placed on the assembly table to ensure that its position is correct and stable, providing a solid foundation for the installation of subsequent components.

[0087] Installation of the insulation assembly: Place the insulation assembly into the lower housing in sequence. The insulation material is a nanomaterial with excellent insulation effect. The thickness is generally 1 to 200 mm, and the temperature resistance is generally 25℃ to 1000℃, ensuring that the insulation performance meets the working requirements of the battery pack.

[0088] Inner box assembly: Place the inner box assembly into the insulation assembly.

[0089] Placement of insulating plates in the battery cell assembly: The insulating plates in the battery cell assembly are carefully placed at the bottom and around the inner box assembly. These insulating plates are usually made of materials such as mica to ensure the insulation level between the battery cell and the inner box assembly, effectively preventing heat loss and short circuits between battery cells.

[0090] Battery cell installation: According to the design requirements of the drawings, place 24 battery cells into the lower housing assembly with the heat insulation board installed in sequence, ensuring that the battery cells are arranged neatly and tightly, and that the battery cells are isolated from each other by the spacer insulation board to prevent short circuits between the battery cells.

[0091] Thermal insulation component: Place the thermal insulation component on top of the battery cell.

[0092] Placement of the heating plate: According to the drawing instructions, place the heater between the upper part of the heat insulation component and the insulation layer. This heater is a special heater with high temperature resistance and a thin film heating element. The working temperature is generally in the range of 260℃~350℃, which ensures that the battery pack can maintain a suitable temperature during operation and improves battery performance and life.

[0093] Main busbar lead-out assembly installation: The negative busbar and positive busbar are sequentially inserted into the battery pack. These busbars are usually made of materials such as nickel plates and stainless steel plates, and are used to realize the overall lead-out of the positive and negative terminals of the battery pack, ensuring that the current can be stably and efficiently combined and transmitted.

[0094] Placement and welding of connecting plates: Connecting plates are precisely placed in a 2-parallel, 12-series configuration to combine the battery cells in series and parallel, where N=12 (series) and M=2 (parallel) to adapt to different application scenarios. Laser welding equipment is used to weld the connecting plates, ensuring a strong and reliable connection between the connecting plates and the battery cells. Welding parameters are strictly controlled during the welding process to avoid welding defects.

[0095] Busbar welding: Use appropriate welding technology to weld the positive and negative busbars to ensure a stable and reliable electrical connection between the busbars and the connecting pieces. After welding, conduct strict inspection to ensure that the welding quality meets the requirements.

[0096] Leading out internal measurement lines: The internal measurement lines are led out from the main lead-out insulation component. These measurement lines include voltage acquisition lines, temperature acquisition lines, insulation test lines, etc. The insulation layer has the ability to withstand temperatures up to 1000℃, ensuring that various data inside the battery pack can still be accurately collected in high-temperature environments, providing real-time monitoring data for the battery management system.

[0097] Installation of the top cover: Place the top cover stably and accurately on top of the battery pack. The top cover is connected to the lower casing with rivets or other fasteners. After connection, the sealing strip can be compressed to form a good sealing effect to meet the requirements of dustproof and waterproof scenarios, effectively protecting the internal components of the battery pack from the influence of the external environment.

[0098] Rivet fixing: Rivets are used to firmly fix the upper cover to the lower casing, ensuring that the entire battery pack structure is stable and robust, and can withstand various mechanical stresses during transportation and use. At the same time, the sealing strip can better perform its sealing function under the compression of the rivets, improving the protection level of the battery pack.

[0099] Example 3

[0100] The battery pack structure of the solid-state sodium battery provided in this embodiment differs from that in Embodiment 1 in that:

[0101] This embodiment uses a configuration of 3 parallel and 10 series cells as an example for illustration.

[0102] Preparation phase: Ensure the assembly table is clean and tidy, and prepare all necessary components and tools, including the lower enclosure, insulation assembly, inner enclosure assembly, 4 insulation layers, heater, thermal insulation components, 30 battery cells, connecting pieces, laser welding equipment, main busbar lead-out components, internal measuring lines, top cover assembly, rivets, etc.

[0103] Placement of the lower enclosure: The lower enclosure assembly is precisely placed on the assembly table to ensure that its position is correct and stable, providing a solid foundation for the installation of subsequent components.

[0104] Installation of the insulation assembly: Place the insulation assembly into the lower housing in sequence. The insulation material is a nanomaterial with excellent insulation effect. The thickness is generally 1 to 200 mm, and the temperature resistance is generally 25℃ to 1000℃, ensuring that the insulation performance meets the working requirements of the battery pack.

[0105] Inner box assembly: Place the inner box assembly into the insulation assembly.

[0106] Placement of insulating plates in the battery cell assembly: The insulating plates in the battery cell assembly are carefully placed at the bottom and around the inner box assembly. These insulating plates are usually made of materials such as mica to ensure the insulation level between the battery cell and the inner box assembly, effectively preventing heat loss and short circuits between battery cells.

[0107] Battery cell installation: According to the design requirements of the drawings, place 30 battery cells into the lower housing assembly with the heat insulation board installed in sequence, ensuring that the battery cells are arranged neatly and tightly, and that the battery cells are isolated from each other by the spacer insulation board to prevent short circuits between the battery cells.

[0108] Thermal insulation component: Place the thermal insulation component on top of the battery cell.

[0109] Placement of the heating plate: According to the drawing instructions, place the heater between the upper part of the heat insulation component and the insulation layer. This heater is a special heater with high temperature resistance and a thin film heating element. The working temperature is generally in the range of 260℃~350℃, which ensures that the battery pack can maintain a suitable temperature during operation and improves battery performance and life.

[0110] Main busbar lead-out assembly installation: The negative busbar and positive busbar are sequentially inserted into the battery pack. These busbars are usually made of materials such as nickel plates and stainless steel plates, and are used to realize the overall lead-out of the positive and negative terminals of the battery pack, ensuring that the current can be stably and efficiently combined and transmitted.

[0111] Placement and welding of connecting plates: Connecting plates are precisely placed in a 3-parallel, 10-series configuration to combine the battery cells in series and parallel, where N=10 (series) and M=3 (parallel) to adapt to different application scenarios. Laser welding equipment is used to weld the connecting plates, ensuring a strong and reliable connection between the connecting plates and the battery cells. Welding parameters are strictly controlled during the welding process to avoid welding defects.

[0112] Busbar welding: Use appropriate welding technology to weld the positive and negative busbars to ensure a stable and reliable electrical connection between the busbars and the connecting pieces. After welding, conduct strict inspection to ensure that the welding quality meets the requirements.

[0113] Leading out internal measurement lines: The internal measurement lines are led out from the main lead-out insulation component. These measurement lines include voltage acquisition lines, temperature acquisition lines, insulation test lines, etc. The insulation layer has the ability to withstand temperatures up to 1000℃, ensuring that various data inside the battery pack can still be accurately collected in high-temperature environments, providing real-time monitoring data for the battery management system.

[0114] Installation of the top cover: Place the top cover stably and accurately on top of the battery pack. The top cover is connected to the lower casing with rivets or other fasteners. After connection, the sealing strip can be compressed to form a good sealing effect to meet the requirements of dustproof and waterproof scenarios, effectively protecting the internal components of the battery pack from the influence of the external environment.

[0115] Rivet fixing: Rivets are used to firmly fix the upper cover to the lower casing, ensuring that the entire battery pack structure is stable and robust, and can withstand various mechanical stresses during transportation and use. At the same time, the sealing strip can better perform its sealing function under the compression of the rivets, improving the protection level of the battery pack.

[0116] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery pack structure for a solid-state sodium battery, characterized in that, It includes an outer casing assembly, an insulation assembly, an inner casing assembly, several insulation layers, a heater, a thermal insulation component, a battery cell assembly, and a main busbar lead-out assembly; The insulation assembly is located inside the outer casing assembly, the inner casing assembly is located inside the insulation assembly, the battery cell assembly is located inside the inner casing assembly, the thermal insulation component, the heater, and several insulation layers are sequentially located on top of the battery cell assembly and installed inside the outer casing assembly, and the main busbar lead-out component is located on the surface of the battery cell assembly and is electrically connected to the battery cell assembly.

2. The battery pack structure of a solid-state sodium battery according to claim 1, characterized in that, The battery cell assembly includes multiple battery cells, a rear insulating plate, side insulating plates, spacer insulating plates, a bottom insulating plate, and rear elastic high-temperature resistant insulation cotton. Side insulating plates are fixedly installed on both sides of the bottom insulating plate. The bottom of the rear insulating plate is fixedly connected to the bottom insulating plate, and both sides of the rear insulating plate are fixedly connected to the side insulating plates. The rear elastic high-temperature resistant insulation cotton is placed on the back of the rear insulating plate, thus forming a square structure with an open top and front and a hollow interior. Multiple battery cells are placed inside the square structure, and spacer insulating plates are placed between the multiple battery cells.

3. The battery pack structure of a solid-state sodium battery according to claim 1, characterized in that, The main busbar lead-out assembly includes an insulating ceramic block, a positive busbar, a negative busbar, and an insulating layer assembly. The insulating layer assembly is installed on the surface of the cell assembly, the insulating ceramic block is installed on the insulating layer assembly, the positive busbar and the negative busbar are installed on the insulating ceramic block, and the positive busbar and the negative busbar are also electrically connected to the positive and negative poles of the cell assembly.

4. The battery pack structure of a solid-state sodium battery according to claim 1, characterized in that, The outer casing assembly includes an upper cover and a lower casing. The lower casing is located below the upper cover and is fixedly connected to the upper cover. A sealing strip is also provided between the upper cover and the lower casing.

5. The battery pack structure of a solid-state sodium battery according to claim 4, characterized in that, The lower housing surface is also provided with several welding screws, which are connected to the BMS battery management system.

6. The battery pack structure of a solid-state sodium battery according to claim 1, characterized in that, The insulation assembly and several insulation layers all contain insulation material, which is a nanomaterial, with a thickness of 1mm to 200mm and a temperature resistance range of 25℃ to 1000℃.

7. The battery pack structure of a solid-state sodium battery according to claim 1, characterized in that, The heating plate is a specially designed thin-film heater that is resistant to high temperatures.

8. The battery pack structure of a solid-state sodium battery according to claim 2, characterized in that, The multiple cells are cells connected in series with N cells and in parallel with M cells, where N = 1 to 10 and M = 1 to 10.

9. The battery pack structure of a solid-state sodium battery according to claim 4, characterized in that, Handles are provided on both sides of the lower housing.

10. The battery pack structure of a solid-state sodium battery according to claim 4, characterized in that, The surfaces of the lower box, the insulation assembly, and the inner box assembly are all provided with square holes.

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