A sodium-ion battery pack

Abstract

This invention relates to the field of sodium-ion battery technology, and in particular to a sodium-ion battery pack, comprising a sodium-ion module. The bottom of the sodium-ion module is connected to a sodium-ion PACK liquid cooling plate, and the top of the sodium-ion module is respectively provided with an A-plate module insulating cover and a B-plate module insulating cover. A series positive and negative copper busbar is connected to one side of the front of the sodium-ion module. This invention's sodium-ion battery pack employs a liquid cooling system combining a sodium-ion PACK liquid cooling plate with internal coolant channels. Alternating layers of adhesive strips and heat-dissipating gel are laid between the sodium-ion PACK liquid cooling plate and the bottom of the sodium-ion module, enabling rapid heat conduction away from the battery module. The coolant channels within the internal components of the sodium-ion PACK liquid cooling plate serve as liquid flow chambers, where ethylene glycol coolant circulates, further carrying away heat. This effectively controls the temperature of the battery pack during operation, preventing performance degradation and safety accidents due to excessive temperature, and extending battery life.

Description

Technical Field

[0001] This invention relates to the field of sodium-ion battery technology, specifically to a sodium-ion battery pack. Background Technology

[0002] With the growing global demand for clean energy and sustainable development, electric vehicles, energy storage systems, and other fields have experienced rapid development. As a core component of these systems, the performance and safety of batteries are crucial. Sodium-ion batteries, as an emerging battery technology, offer numerous advantages. First, sodium is abundant and widely distributed in the Earth's crust, and its low cost gives sodium-ion batteries a significant cost advantage for large-scale applications.

[0003] Sodium-ion batteries generate heat during charging and discharging. If the heat cannot be dissipated in time, the battery temperature will rise, affecting the battery's performance and lifespan, and may even cause safety accidents. Existing battery packs have inadequate heat dissipation designs, resulting in low heat dissipation efficiency and an inability to effectively control battery temperature. In terms of electrical connections, there are unreasonable layouts and unreliable connections, which increases the risk of battery pack failure. To solve the above technical problems, we have designed a sodium-ion battery pack. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] The purpose of this invention is to provide a sodium-ion battery pack with the advantages of reasonable electrical connection layout and good heat dissipation, which solves the problem of low heat dissipation efficiency caused by unreasonable heat dissipation design of existing battery packs.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sodium-ion battery pack, comprising a sodium-ion module, a sodium-ion PACK liquid cooling plate connected to the bottom of the sodium-ion module, an A-plate module insulating cover and a B-plate module insulating cover respectively disposed on the top of the sodium-ion module, a total positive copper busbar connected to one side of the front of the sodium-ion module, a total negative copper busbar connected to the other side of the front of the sodium-ion module, a module series copper busbar connected to the rear of the sodium-ion module, a sodium-ion PACK liquid cooling box cover sleeved on the outside of the sodium-ion module, a plug-in sealing plate connected to the surface of the sodium-ion PACK liquid cooling box cover, and an MSD socket penetratingly connected to the surface of the plug-in sealing plate.

[0007] Preferably, a communication port socket is connected through the top of the plug-in sealing plate surface, and a PACK positive socket and a PACK negative socket are respectively provided through one side of the plug-in sealing plate surface.

[0008] Preferably, the front side of the sodium ion module is connected to the left copper busbar of the MSD, and the right copper busbar of the MSD is connected to one side of the left copper busbar of the MSD.

[0009] Preferably, an American fast-acting fuse is connected to the front side of the sodium ion module, and one side of the American fast-acting fuse is connected to the right copper busbar of the MSD.

[0010] Preferably, a window sealing plate is embedded in the surface of the sodium ion PACK liquid cooling box cover, and the window sealing plate is sealed to the connection between the sodium ion PACK liquid cooling box cover and the sealing ring.

[0011] Preferably, a sodium ion PACK fire nozzle is connected through the surface of the sodium ion PACK liquid cooling tank cover, and a sodium ion PACK explosion-proof valve is provided through the surface of the sodium ion PACK liquid cooling tank cover and below the sodium ion PACK fire nozzle.

[0012] Preferably, an ethylene glycol coolant inlet is provided on one side of the surface of the sodium ion PACK liquid cooling plate, and an ethylene glycol coolant outlet is provided on the other side of the surface of the sodium ion PACK liquid cooling plate.

[0013] Preferably, sodium ion pack liquid cooling plate has sodium ion pack fixing points on both sides of its surface. The sodium ion pack liquid cooling plate is made of aluminum. Cooling liquid channels are provided inside the sodium ion pack liquid cooling plate. The sodium ion pack liquid cooling plate is connected to the sodium ion pack liquid cooling box cover by bolts. A mounting bracket is connected to the surface of the sodium ion pack liquid cooling plate, and mounting holes are provided on the surface of the mounting bracket.

[0014] A method for preparing and assembling a sodium-ion battery pack includes the following steps: S1. Module preparation: Select multiple sodium-ion batteries and arrange them into a module. Use insulating materials to isolate the batteries. Install end plates at both ends of the module. Apply external force to squeeze the end plates to make the batteries tightly arranged together. Then use steel strips to tighten the end plates to further fix the structure of the battery module. S2. Battery series material welding: The materials used for battery series connection are accurately welded to the battery terminals through a welding process to achieve series connection between batteries and form battery module units. S3. Preparation of Sodium Ion Pack Liquid Cooling Plate: Aluminum is selected as the main material for sodium ion pack liquid cooling plate. The various parts of sodium ion pack liquid cooling plate are manufactured by mold extrusion molding process. The manufactured parts are subjected to quality inspection to ensure that their dimensional accuracy and surface quality meet the standards. For the bottom parts of sodium ion pack liquid cooling plate, the coolant flow channel is processed by welding method so that it can serve as a liquid flow chamber. Mounting holes are processed on sodium ion pack liquid cooling plate for fastening connection with sodium ion pack liquid cooling box cover. S4. Module Installation: Fix the prepared individual battery modules to the designated positions on the sodium-ion PACK liquid cooling plate with bolts, and lay insulating material at the bottom of the module. S5. Connection between sodium ion pack liquid cooling box cover and module: Pre-process the sodium ion pack liquid cooling box cover to ensure that its front-end wiring mechanism is intact and functioning properly. Install the sodium ion pack liquid cooling box cover onto the sodium ion pack liquid cooling plate, so that the wiring mechanism at the front end of the module and the sodium ion pack liquid cooling box cover are connected to each other through the main positive copper busbar, the main negative copper busbar and the module series copper busbar to form a complete electrical connection path.

[0015] Preferably, the following steps are also included: S6. Install other components: Install the American fast fuse and accurately connect one side of it to the right copper busbar of the MSD to quickly cut off the circuit when an abnormal overcurrent occurs. Install the plug-in sealing plate and connect the MSD socket, communication port socket, PACK positive socket and PACK negative socket through the plug-in sealing plate. S7. Install window sealing plates, and install sodium ion PACK fire nozzles and sodium ion PACK explosion-proof valves; S8. Liquid Cooling System Installation and Commissioning: Install the sodium ion pack liquid cooling plate onto the bottom of the sodium ion pack liquid cooling plate, ensuring it contacts the bottom of the sodium ion module. Connect the ethylene glycol coolant inlet and outlet, inject ethylene glycol coolant into the liquid cooling system, and commission the liquid cooling system to check if the coolant circulation is smooth.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The sodium-ion battery pack of this invention adopts a liquid cooling system that combines a sodium-ion PACK liquid cooling plate with an internal coolant channel. The sodium-ion PACK liquid cooling plate is in good contact with the bottom of the sodium-ion module, which can quickly conduct away the heat generated by the battery module. The coolant channel inside the components of the sodium-ion PACK liquid cooling plate serves as a liquid flow chamber in which ethylene glycol coolant circulates, further carrying away heat. This effectively controls the temperature of the battery pack during operation, avoids battery performance degradation and safety accidents caused by excessive temperature, and extends the battery's service life.

[0017] 2. This invention connects the sodium-ion module and the front-end wiring mechanism of the sodium-ion PACK liquid cooling tank cover by means of a total positive copper busbar, a total negative copper busbar and a module series copper busbar, forming a complete and reliable electrical connection path. This ensures the stable transmission and distribution of electrical energy inside the battery pack, reduces the probability of electrical connection failures, and improves the reliability and stability of the battery pack.

[0018] 3. When an abnormal overcurrent occurs in the circuit, the American-style fast-acting fuse can quickly cut off the circuit, preventing excessive current from damaging the battery module and other electrical components, effectively protecting the safety of the battery pack, and reducing the risk of safety accidents such as fires caused by overcurrent. The American-style fast-acting fuse has the advantages of fast response speed and strong breaking capacity, and can cut off the fault current in milliseconds, effectively protecting the safety of the battery pack. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the sodium ion module and sodium ion PACK liquid cooling plate of the present invention. Figure 3 This is a side view schematic diagram of the sodium ion PACK liquid cooling plate and the sodium ion PACK liquid cooling box cover of the present invention. Figure 4 This is a front view schematic diagram of the sodium ion PACK liquid cooling plate and the sodium ion PACK liquid cooling box cover of the present invention. Figure 5 This is a top view of the sodium ion PACK liquid cooling box cover and mounting bracket of the present invention; Figure 6 These are top views of the insulating covers for module A and module B of the present invention. Figure 7 This is a top view of the sodium ion module and mounting bracket of the present invention; Figure 8 This is a front view schematic diagram of the sodium ion module and sodium ion PACK liquid cooling plate of the present invention.

[0021] In the diagram: 1. Sodium ion module; 2. Sodium ion pack liquid cooling plate; 3. A-version module insulating cover; 4. B-version module insulating cover; 5. Main positive copper busbar; 6. Main negative copper busbar; 7. Module series copper busbar; 8. Sodium ion pack liquid cooling box cover; 9. Plug-in sealing plate; 10. MSD socket; 11. Communication port socket; 12. PACK positive socket; 13. PACK negative socket; 14. MSD left copper busbar; 15. MSD right copper busbar; 16. American fast-acting fuse; 17. Window sealing plate; 18. Sodium ion pack fire nozzle; 19. Sodium ion pack explosion-proof valve; 20. Ethylene glycol coolant inlet; 21. Ethylene glycol coolant outlet; 22. Sodium ion pack fixing point; 23. Mounting bracket; 24. Mounting hole. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1 Please see Figures 1-8 A sodium-ion battery pack includes a sodium-ion module 1, a sodium-ion PACK liquid cooling plate 2 connected to the bottom of the sodium-ion module 1, an A-plate module insulating cover 3 and a B-plate module insulating cover 4 respectively disposed on the top of the sodium-ion module 1, a main positive copper busbar 5 connected to one side of the front of the sodium-ion module 1, a main negative copper busbar 6 connected to the other side of the front of the sodium-ion module 1, a module series copper busbar 7 connected to the rear of the sodium-ion module 1, a sodium-ion PACK liquid cooling box cover 8 covering the outside of the sodium-ion module 1, a plug-in sealing plate 9 connected to the surface of the sodium-ion PACK liquid cooling box cover 8, and a through-hole connection on the surface of the plug-in sealing plate 9. The sodium-ion battery pack features an MSD socket 10 and employs a liquid cooling system that combines a sodium-ion PACK liquid cooling plate 2 with internal coolant channels. The sodium-ion PACK liquid cooling plate 2 maintains good contact with the bottom of the sodium-ion module 1, enabling rapid heat dissipation from the battery module. The coolant channels within the internal components of the sodium-ion PACK liquid cooling plate 2 serve as chambers for liquid flow, where ethylene glycol coolant circulates, further carrying away heat. This effectively controls the temperature of the battery pack during operation, preventing performance degradation and safety accidents caused by excessively high temperatures, and extending battery life.

[0024] A communication port socket 11 is connected through the top of the plug-in sealing plate 9. A PACK positive socket 12 and a PACK negative socket 13 are respectively provided through one side of the plug-in sealing plate 9. By setting the communication port socket 11, PACK positive socket 12 and PACK negative socket 13, a convenient and efficient interface is provided for the interaction between the battery pack and external devices. The presence of the communication port socket 11 enables the battery pack to communicate with monitoring systems, management systems, etc. in real time. The PACK positive socket 12 and PACK negative socket 13 provide standard interfaces for the power input and output of the battery pack. During the charging process, the external power supply transmits power to the inside of the battery pack through these two sockets to charge the battery.

[0025] The front of the sodium-ion module 1 is connected to the left copper busbar 14 of the MSD, and the right copper busbar 15 of the MSD is connected to one side of the left copper busbar 14. The left copper busbar 14 and the right copper busbar 15 of the MSD facilitate the maintenance and safe operation of the battery pack. When the battery pack needs maintenance or repair, the circuit can be cut off by operating the MSD to ensure the safety of the operator. At the same time, it is also convenient to conduct relevant tests and troubleshooting of the battery pack. When troubleshooting circuit faults, the fault area can be isolated by disconnecting the MSD, narrowing down the fault range and improving the efficiency of fault troubleshooting.

[0026] A fast-acting fuse 16 is connected to the front of the sodium-ion module 1. One side of the fast-acting fuse 16 is connected to the right copper busbar 15 of the MSD. When an abnormal overcurrent occurs in the circuit, the fast-acting fuse 16 can quickly cut off the circuit to prevent excessive current from damaging the battery module and other electrical components, effectively protecting the safety of the battery pack and reducing the risk of safety accidents such as fires caused by overcurrent. The fast-acting fuse 16 has the advantages of fast response speed and strong breaking capacity. It can cut off the fault current in milliseconds, effectively protecting the safety of the battery pack.

[0027] A window sealing plate 17 is inlaid and connected to the surface of the sodium-ion PACK liquid cooling box cover 8. The window sealing plate 17 is sealed to the connection between the sodium-ion PACK liquid cooling box cover 8 and the sealing ring. By setting the sealing ring, external liquids, dust and other impurities can be prevented from entering the battery pack, protecting the internal electrical components from damage, ensuring that the battery pack can work normally in various harsh environments, and improving the reliability and service life of the battery pack.

[0028] A sodium-ion pack fire nozzle 18 is connected through the surface of the sodium-ion pack liquid cooling tank cover 8. A sodium-ion pack explosion-proof valve 19 is installed through the surface of the sodium-ion pack liquid cooling tank cover 8 and below the sodium-ion pack fire nozzle 18. In case of emergency such as thermal runaway of the battery pack, the sodium-ion pack fire nozzle 18 can quickly spray fire-fighting medium when it detects a thermal runaway signal. This fire-fighting medium has high fire extinguishing performance, can quickly suppress the spread of fire, reduce the internal temperature of the battery pack, and prevent the fire from expanding further. The sodium-ion pack explosion-proof valve 19 can automatically open in time when the internal pressure of the battery pack is too high, quickly discharge the high-pressure gas inside, reduce the internal pressure of the battery pack, and prevent the battery pack from exploding due to excessive pressure. This combination design of fire nozzle and explosion-proof valve forms a complete emergency safety mechanism, which greatly improves the survivability of the battery pack in the face of emergency and ensures the safety of personnel and equipment.

[0029] One side of the sodium ion pack liquid cooling plate 2 has an ethylene glycol coolant inlet 20, and the other side has an ethylene glycol coolant outlet 21. The inlet and outlet provide convenient interfaces for the injection and discharge of coolant. When installing the liquid cooling system for the first time, ethylene glycol coolant can be injected into the system through the inlet and the air in the system can be discharged through the outlet to ensure that the system is full of coolant and avoid air resistance that affects the heat dissipation effect.

[0030] Both sides of the sodium-ion pack liquid cooling plate 2 are provided with sodium-ion pack fixing points 22. The sodium-ion pack liquid cooling plate 2 is made of aluminum. The sodium-ion pack liquid cooling plate 2 has a coolant flow channel inside. The sodium-ion pack liquid cooling plate 2 is connected to the sodium-ion pack liquid cooling box cover 8 by bolts. The surface of the sodium-ion pack liquid cooling plate 2 is connected to a mounting bracket 23. The surface of the mounting bracket 23 has mounting holes 24. By setting the sodium-ion pack fixing points 22, it is easy to fix the liquid cooling plate to the component and ensure the stable installation of the liquid cooling plate. Aluminum is selected as the main material. Aluminum has the characteristics of light weight and good thermal conductivity, which can reduce the overall weight of the battery pack and facilitate heat conduction. The internal coolant flow channel and the connection with the sodium-ion pack liquid cooling plate 2 by bolts ensure the structural integrity and sealing of the liquid cooling system, improve heat dissipation efficiency and reliability. By setting the mounting bracket 23 and mounting holes 24, it is easy to fix the sodium-ion pack liquid cooling plate 2 to the sodium-ion pack liquid cooling box cover 8, and the connection is stable.

[0031] Example 2 A method for preparing and assembling a sodium-ion battery pack includes the following steps: S1. Module preparation: Select multiple sodium-ion batteries and arrange them into a module. Use insulating materials to isolate the batteries. Install end plates at both ends of the module. Apply external force to squeeze the end plates to make the batteries tightly arranged together. Then use steel strips to tighten the end plates to further fix the structure of the battery module. S2. Battery series material welding: The materials used for battery series connection are accurately welded to the battery terminals through a welding process to achieve series connection between batteries and form battery module units. S3. Preparation of Sodium Ion PACK Liquid Cooling Plate 2: Aluminum is selected as the main material of sodium ion PACK liquid cooling plate 2. The various parts of sodium ion PACK liquid cooling plate 2 are manufactured by mold extrusion molding process. The manufactured parts are subjected to quality inspection to ensure that their dimensional accuracy and surface quality meet the standards. For the bottom parts of sodium ion PACK liquid cooling plate 2, the coolant flow channel is processed by welding method so that it can serve as a liquid flow chamber. Mounting holes 24 are processed on sodium ion PACK liquid cooling plate 2 for fastening connection with sodium ion PACK liquid cooling box cover 8. S4. Module installation: Fix the prepared individual battery modules to the designated positions on the sodium-ion PACK liquid cooling plate 2 with bolts, and lay insulating material at the bottom of the module. S5. Connection between sodium ion PACK liquid cooling box cover 8 and module: Pre-process sodium ion PACK liquid cooling box cover 8 to ensure that its front-end wiring mechanism is intact and functioning normally. Install sodium ion PACK liquid cooling box cover 8 onto sodium ion PACK liquid cooling plate 2, so that the module and the wiring mechanism at the front end of sodium ion PACK liquid cooling box cover 8 are connected to each other through the main positive copper busbar 5, the main negative copper busbar 6 and the module series copper busbar 7 to form a complete electrical connection path.

[0032] It also includes the following steps: S6. Install other components: Install the American fast fuse 16 and accurately connect one side of it to the right copper busbar of MSD 15. It will quickly cut off the circuit when an abnormal overcurrent occurs. Install the plug-in sealing plate 9 and connect the MSD socket 10, communication port socket 11, PACK positive socket 12 and PACK negative socket 13 through the plug-in sealing plate 9. S7. Install window sealing plate 17, sodium ion PACK fire nozzle 18 and sodium ion PACK explosion-proof valve 19; S8. Liquid cooling system installation and commissioning: Install the sodium ion PACK liquid cooling plate 2 to the bottom of the sodium ion PACK liquid cooling plate 2, so that it contacts the bottom of the sodium ion module 1. Connect the ethylene glycol coolant inlet 20 and the ethylene glycol coolant outlet 21. Inject ethylene glycol coolant into the liquid cooling system. Commission the liquid cooling system and check whether the coolant circulation is smooth.

[0033] It should be noted that any content not described in detail in this specification belongs to the prior art known to those skilled in the art. The specific embodiments described herein are merely illustrative examples of the spirit of the invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A sodium-ion battery pack, comprising a sodium-ion module (1), characterized in that: The bottom of the sodium ion module (1) is connected to a sodium ion PACK liquid cooling plate (2). The top of the sodium ion module (1) is respectively provided with an A-version module insulation cover (3) and a B-version module insulation cover (4). One side of the front of the sodium ion module (1) is connected to a total positive copper busbar (5). The other side of the front of the sodium ion module (1) is connected to a total negative copper busbar (6). The rear side of the sodium ion module (1) is connected to a module series copper busbar (7). The sodium ion module (1) is covered with a sodium ion PACK liquid cooling box cover (8). The surface of the sodium ion PACK liquid cooling box cover (8) is connected to a plug-in sealing plate (9). The surface of the plug-in sealing plate (9) is connected to an MSD socket (10).

2. A sodium-ion battery pack according to claim 1, characterized in that: A communication port socket (11) is connected through the top of the surface of the plug-in sealing plate (9), and a PACK positive socket (12) and a PACK negative socket (13) are respectively provided through one side of the surface of the plug-in sealing plate (9).

3. A sodium-ion battery pack according to claim 1, characterized in that: The front side of the sodium ion module (1) is connected to the left copper busbar of the MSD (14), and the right copper busbar of the MSD (15) is connected to one side of the left copper busbar of the MSD (14).

4. A sodium-ion battery pack according to claim 3, characterized in that: The front side of the sodium ion module (1) is connected to an American fast-acting fuse (16), and one side of the American fast-acting fuse (16) is connected to the right copper busbar (15) of the MSD.

5. A sodium-ion battery pack according to claim 1, characterized in that: A window sealing plate (17) is inlaid on the surface of the sodium ion PACK liquid cooling box cover (8), and the window sealing plate (17) is sealed to the sodium ion PACK liquid cooling box cover (8) by a sealing ring.

6. A sodium-ion battery pack according to claim 1, characterized in that: A sodium ion PACK fire nozzle (18) is connected through the surface of the sodium ion PACK liquid cooling box cover (8), and a sodium ion PACK explosion-proof valve (19) is provided through the surface of the sodium ion PACK liquid cooling box cover (8) and below the sodium ion PACK fire nozzle (18).

7. A sodium-ion battery pack according to claim 1, characterized in that: An ethylene glycol coolant inlet (20) is provided on one side of the surface of the sodium ion PACK liquid cooling plate (2), and an ethylene glycol coolant outlet (21) is provided on the other side of the surface of the sodium ion PACK liquid cooling plate (2).

8. A sodium-ion battery pack according to claim 1, characterized in that: Sodium ion PACK liquid cooling plate (2) has sodium ion PACK fixing points (22) on both sides of its surface. The sodium ion PACK liquid cooling plate (2) is made of aluminum. Cooling liquid channels are provided inside the sodium ion PACK liquid cooling plate (2). The sodium ion PACK liquid cooling plate (2) is connected to the sodium ion PACK liquid cooling box cover (8) by bolts. A mounting bracket (23) is connected to the surface of the sodium ion PACK liquid cooling plate (2). Mounting holes (24) are opened on the surface of the mounting bracket (23).

9. A method for preparing and assembling a sodium-ion battery pack according to any one of claims 1-8, characterized in that... Includes the following steps: S1. Module preparation: Select 13 sodium-ion batteries and arrange them in series to form an independent module. Use insulating materials to isolate the batteries. Install end plates at both ends of the module and use external force to squeeze the end plates to make the batteries tightly arranged together. Then use steel strips to tighten the end plates to further fix the structure of the battery module. S2. Battery series material welding: The materials used for battery series connection are accurately welded to the battery terminals through a welding process to achieve series connection between batteries and form battery module units. S3, Sodium ion PACK liquid cooling plate (2) preparation: Aluminum is selected as the main material of sodium ion PACK liquid cooling plate (2). The parts of sodium ion PACK liquid cooling plate (2) are manufactured by mold extrusion molding process. The manufactured parts are inspected to ensure that their dimensional accuracy and surface quality meet the standards. For the bottom parts of sodium ion PACK liquid cooling plate (2), the cooling liquid flow channel is processed by welding method so that it can serve as a liquid flow chamber. Mounting holes are processed on sodium ion PACK liquid cooling plate (2) for fastening connection with sodium ion PACK liquid cooling box cover (8). S4. Module installation: The prepared individual battery modules are fixed to the designated positions of the sodium-ion PACK liquid cooling plate (2) with bolts, and insulating material is laid at the bottom of the module. S5. Connection between sodium ion PACK liquid cooling box cover (8) and module: Pre-process the sodium ion PACK liquid cooling box cover (8) to ensure that its front-end wiring mechanism is intact and functioning normally. Install the sodium ion PACK liquid cooling box cover (8) onto the sodium ion PACK liquid cooling plate (2) so that the wiring mechanism at the front end of the module and the sodium ion PACK liquid cooling box cover (8) are connected to each other through the main positive copper busbar (5), the main negative copper busbar (6) and the module series copper busbar (7) to form a complete electrical connection path.

10. A sodium-ion battery pack according to claim 9, characterized in that: It also includes the following steps: S6. Install other components: Install the American fast fuse (16), accurately connect one side of it to the right copper busbar of MSD (15), and quickly cut off the circuit when an abnormal overcurrent occurs. Install the plug-in sealing plate (9), and connect the MSD socket (10), communication port socket (11), PACK positive socket (12) and PACK negative socket (13) through the plug-in sealing plate (9). S7. Install window sealing plate (17), sodium ion PACK fire nozzle (18) and sodium ion PACK explosion-proof valve (19). S8. Liquid cooling system installation and commissioning: Install the sodium ion PACK liquid cooling plate (2) to the bottom of the sodium ion PACK liquid cooling plate (2) so that it contacts the bottom of the sodium ion module (1), connect the ethylene glycol coolant inlet (20) and the ethylene glycol coolant outlet (21), inject ethylene glycol coolant into the liquid cooling system, commission the liquid cooling system, and check whether the coolant circulation is smooth.

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