A sodium electric high-multiplying starting power battery pack

Abstract

The utility model provides a kind of sodium electricity high rate starting power supply battery pack, belong to power battery technical field.The battery pack can be discharged at low temperature environment, can be self-protected under overload, overloading, product life is extended, and the safety and reliability of product are improved.The lower end of the battery module of the power battery pack is inserted in the lower barrel, the bottom of the battery module is bonded with the lower barrel, the upper cover is sealed on the open top of the lower barrel to realize the packaging of the battery module, the negative pole column and the positive pole column inside and outside the shell are fixedly arranged on the upper cover, the busbar leading-out assembly arranged on the battery module is connected with the negative pole column and the positive pole column, and the negative pole column and the positive pole column are respectively connected to form negative pole conduction and positive pole conduction, and the electrical equipment is connected to the negative pole column and the positive pole column outside the shell to supply power.The power battery pack is developed based on the physical and chemical properties of sodium battery, has strong temperature variation resistance, is matched with control assembly, has improved operation stability and reliability, and has greatly improved product market competitiveness.

Description

Technical Field

[0001] This utility model belongs to the field of power battery technology, and in particular relates to a sodium-ion high-rate starting power battery pack. Background Technology

[0002] Existing lithium-ion batteries exhibit significant defects in low-temperature environments (<0℃): increased electrolyte viscosity leads to a decrease in lithium-ion migration rate, resulting in increased internal resistance (by 30%-50%), significant capacity decay, and a 20%-30% reduction in discharge efficiency. Furthermore, they are prone to voltage instability, triggering low-temperature protection mechanisms that restrict charging functionality, and even causing automatic shutdown. Lead-acid batteries, at 0℃, show an internal resistance increase of 0.3Ω compared to 25℃, with charge / discharge capacities decreasing to 60%-70% and 50%-60%, respectively. Cycle life is also accelerated due to issues such as SEI film thickening and lithium deposition. These defects result in halved battery range in winter, requiring temperatures to rise above 15℃ for normal charging, severely limiting their application in low-temperature scenarios. Low-temperature charging also accelerates electrode aging and shortens battery life. Lead-acid batteries are similarly limited by increased internal resistance at low temperatures (15%-20% increase for every 10℃ drop), a sharp decrease in capacity (only 60%-70% charge capacity at 0℃), and a 40%-50% decrease in ion migration rate.

[0003] In comparison, sodium-ion batteries have the following technological advantages: High efficiency of ion transport: The Stokes radius of sodium ions (2.8 Å) is smaller than that of lithium ions (3.8 Å), reducing migration resistance in the electrolyte by 30%; the diffusion rate at -40℃ is 5-8 times that of lithium ions, and the charge transfer impedance is significantly reduced.

[0004] Low-temperature stability: The solvation energy (194 kJ / mol) is lower than that of lithium ions (239 kJ / mol), making it easier to detach from the solvent shell; the freezing point of the acetonitrile-based electrolyte is as low as -80℃, and the ionic conductivity is still >10 mS / cm at -40℃.

[0005] Interface optimization: Film-forming additives reduce the low-temperature impedance of the SEI film by 60%; the layered oxide cathode material achieves a cycle efficiency of 95% at -30℃ to -40℃.

[0006] Structural reliability: The aluminum foil negative electrode current collector avoids the low-temperature brittleness of the copper foil, reducing internal resistance by 15%; the self-heating effect is weak, and it can start at -40℃ without complex temperature control.

[0007] In light of the technological barriers and future development prospects in the field of battery technology, this utility model provides a sodium-based power battery pack to meet market needs. Utility Model Content

[0008] To address the problems existing in the background technology, this utility model provides a sodium-ion battery pack with a high-rate starting capability. This battery pack conforms to the electrochemical reaction of sodium-ion batteries, can discharge at a high rate in low-temperature environments, can self-protect under overload and overload conditions, extends product life, and improves product safety and reliability.

[0009] The technical solution adopted by this utility model to solve its technical problem is: a sodium-ion high-rate starting power supply battery pack, including a shell and a battery module encapsulated inside the shell. The shell includes a lower barrel and a top cover. The lower end of the battery module is inserted into the lower barrel, and the bottom of the battery module is bonded to the lower barrel. The top cover seals the top opening of the lower barrel to encapsulate the battery module. A negative terminal and a positive terminal are fixedly provided on the top cover to connect the inside and outside of the shell. A current-conducting lead-out component provided on the battery module is connected to both the negative terminal and the positive terminal, respectively forming negative and positive conduction. The electrical device is powered by connecting to the negative terminal and the positive terminal outside the shell. A handle is hinged on the outside of the top cover.

[0010] The battery module includes a busbar output assembly, a limiting assembly, a sheet metal support assembly, a control assembly, and a battery pack. The battery pack includes multiple battery cells stacked and bonded along the thickness direction. Each battery cell is a soft-pack sodium-ion battery. The busbar output assembly is connected to each battery cell. The limiting assembly covers and is disposed on the four sides and bottom of the battery pack. The sheet metal support assembly is U-shaped and mounted on the bottom and sides of the battery pack. The sheet metal support assembly is fastened to the outside of the limiting assembly. The control assembly is fixedly disposed on the sheet metal support assembly. The control assembly is connected to the busbar output assembly via a data acquisition line, thereby realizing the drive and control connection of the battery pack.

[0011] The busbar assembly includes a negative lead-out aluminum busbar, a positive lead-out aluminum busbar, a negative electrode connecting aluminum busbar, a positive electrode connecting aluminum busbar, a fuse, and multiple series-connected aluminum busbars. The multiple series-connected aluminum busbars are connected in series to connect multiple battery cells to form a battery pack. The negative lead-out aluminum busbar is fixedly located at the negative terminal of the battery pack, and the positive lead-out aluminum busbar is fixedly located at the positive terminal of the battery pack. One end of the negative electrode connecting aluminum busbar is connected to the negative terminal post, and the other end of the negative electrode connecting aluminum busbar is connected to the negative lead-out aluminum busbar. One end of the positive electrode connecting aluminum busbar is connected to the positive terminal post, and the other end of the positive electrode connecting aluminum busbar is connected to the positive lead-out aluminum busbar through the fuse. The acquisition line is connected to the negative lead-out aluminum busbar, the positive lead-out aluminum busbar, and the multiple series-connected aluminum busbars.

[0012] The fuse is made of aluminum busbar or fuse. The aluminum busbar has a fuse groove. One end of the aluminum busbar is fixedly connected to the positive lead aluminum busbar by a fixing screw and a fixing nut. An insulating seat is fixedly installed on the outer wall of the sheet metal support assembly. The mating end of the aluminum busbar and the positive lead aluminum busbar is fixedly connected to the insulating seat by a fixing screw.

[0013] The limiting component includes multiple EVA, multiple epoxy boards and multiple MPPs. EVA is attached to each side of the battery pack. Epoxy boards are spaced between the EVA and the sheet metal support component. Epoxy boards are placed between the bottom surface of the battery pack and the sheet metal support component. MPPs are sandwiched between the epoxy boards and the bottom surface of the battery pack. Epoxy boards are placed between the battery pack and the busbar lead-out component.

[0014] The sheet metal support assembly has a U-shaped bottom with a flat bottom. Multiple feet are provided at the top edge of the sheet metal support for connecting with the top cover, and the top of each foot is horizontal.

[0015] The control components are either a balance board or a BMS.

[0016] Multiple riveting holes are provided on the epoxy board between the current-drawing component and the battery pack. Riveting holes are also provided at the alignment points on the sheet metal bracket. Plastic rivets are riveted into the two aligned riveting holes to achieve a fixed connection between the epoxy board and the sheet metal bracket.

[0017] Anti-slip bolts are fixedly installed on both the negative electrode connecting aluminum busbar and the positive electrode connecting aluminum busbar. The anti-slip bolts on the negative electrode connecting aluminum busbar are connected to the negative electrode post, and the anti-slip bolts on the positive electrode connecting aluminum busbar are connected to the positive electrode post.

[0018] Multiple through slots are formed on the epoxy board between the current-leading assembly and the battery pack. On the negative electrode lead-out aluminum busbar, positive electrode lead-out aluminum busbar, negative electrode docking aluminum busbar, positive electrode docking aluminum busbar and multiple series aluminum busbars, through slots are formed to align with the multiple through slots. The tab of each battery cell passes through the aligned through slots and through slots and is welded to the aligned negative electrode lead-out aluminum busbar, positive electrode lead-out aluminum busbar, negative electrode docking aluminum busbar, positive electrode docking aluminum busbar or series aluminum busbar respectively.

[0019] The beneficial effects of this invention are as follows: This power battery pack conforms to the electrochemical reaction of sodium-ion batteries, optimizes the physicochemical properties of the power battery pack, and improves its resistance to temperature changes. The battery pack uses a stacked connection of individual cells and is equipped with control components, ensuring stable operation and high-rate discharge at low temperatures. It also features self-protection under overload and overload conditions, improving product lifespan, enhancing product safety and reliability, and strengthening the product's competitiveness in the market. Attached Figure Description

[0020] In the attached diagram: Figure 1 This is an exploded view of the structure of this utility model, shown as an isometric projection. Figure 1 ; Figure 2 This is an exploded view of the structure of this utility model, shown as an isometric projection. Figure 2 ; Figure 3This is a schematic diagram showing the relationship between the top cover and the sodium ion module of this utility model; In the diagram: 1. Lower bucket; 2. Top cover; 3. Handle; 4. Battery module; 5. Fuse; 201. Negative terminal; 202. Positive terminal; 40. Busbar output assembly; 41. Limiting assembly; 42. Sheet metal support assembly; 43. Control assembly; 44. Battery pack; 401. Series aluminum busbar; 402. Negative lead-out aluminum busbar; 403. Positive lead-out aluminum busbar; 404. Negative lead-out aluminum busbar; 405. Positive lead-out aluminum busbar; 406. Fusible aluminum busbar; 407. Press-fit screw; 408. Anti-slip bolt; 4061. Fixing screw; 4062. Fixing nut; 4063. Insulating base; 4064. Fusible groove; 411, EVA; 412, Epoxy board; 413, MPP; 414, Top EVA; 4121, Riveting hole; 4122, Through groove; 421, Sheet metal bracket; 422, Support leg; 431, Data acquisition line; 441, Battery cell. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0022] A sodium-ion high-rate starting power supply battery pack includes a housing and a battery module 4 encapsulated inside the housing. The housing includes a lower container 1 and an upper cover 2. The lower end of the battery module 4 is inserted into the lower container 1, and the bottom of the battery module 4 is bonded to the lower container 1. The upper cover 2 covers the top opening of the lower container 1, and the edge of the upper cover 2 is fixedly engaged with the edge of the opening of the lower container 1. The engagement is achieved using a common plug-in and slot design, thereby encapsulating the battery module 4. A connection between the inside and outside of the housing is fixedly provided on the upper cover 2. The negative terminal 201 and positive terminal 202 are connected to the current-carrying component 40 on the battery module 4, forming negative and positive conduction respectively. The electrical device is powered by connecting to the negative terminal 201 and positive terminal 202 outside the casing. The upper cover 2 is hinged to a handle 3 for carrying and transferring the power battery pack. The lower bucket 1, upper cover 2 and handle 3 are all made of ABS or PC combined with ABS, which have structural strength and are flame retardant.

[0023] The battery module 4 includes a busbar lead-out assembly 40, a limiting assembly 41, a sheet metal support assembly 42, a control assembly 43, and a battery pack 44. The battery pack 44 includes multiple battery cells 441 stacked and bonded along the thickness direction. Each battery cell 441 is a pouch sodium-ion battery. Adjacent battery cells 441 are bonded with hot melt adhesive or flexible adhesives such as double-sided tape. The busbar lead-out assembly 40 is connected to each battery cell 441. The limiting assembly 41 covers and is disposed on the four sides and bottom of the battery pack 44. The sheet metal support assembly 42 is U-shaped and supports the battery pack. At the bottom and sides of the battery pack 44, the sheet metal support assembly 42 is fastened to the outside of the limiting assembly 41. The control assembly 43 is fixedly mounted on the sheet metal support assembly 42. The control assembly 43 is connected to the busbar output assembly 40 through the acquisition line 431, thereby realizing the drive and control connection of the battery pack 44. The top of the busbar output assembly 40 is provided with a top EVA 414 with adhesive backing, with the adhesive backing facing the busbar output assembly 40. It is pasted on the upper part of the busbar output assembly 40 and the acquisition line 431, limiting the acquisition line 431 and protecting the busbar output assembly 40 from the risk of short circuit caused by metal objects.

[0024] The busbar assembly 40 includes a negative lead-out aluminum busbar 402, a positive lead-out aluminum busbar 403, a negative electrode connecting aluminum busbar 404, a positive electrode connecting aluminum busbar 405, a fuse, and multiple series-connected aluminum busbars 401. The multiple series-connected aluminum busbars 401 are connected in series to multiple battery cells 441 to form a battery pack 44. The negative lead-out aluminum busbar 402 is fixedly disposed at the negative terminal of the battery pack 44, and the positive lead-out aluminum busbar is fixedly disposed at the positive terminal of the battery pack 44. One end of the negative electrode connecting aluminum busbar 404 is connected to the negative electrode post 201, and the other end of the negative electrode connecting aluminum busbar 403 is connected to the negative lead-out aluminum busbar 404. 2. When connected, the negative electrode connecting aluminum busbar 404 is fixedly connected to the negative electrode lead-out aluminum busbar 402 by the rivet screw 407. One end of the positive electrode connecting aluminum busbar 405 is connected to the positive electrode post 202, and the other end of the positive electrode connecting aluminum busbar 405 is connected to the positive electrode lead-out aluminum busbar 403 through the fuse. The acquisition line 431 is connected to the negative electrode lead-out aluminum busbar 402, the positive electrode lead-out aluminum busbar 403, and multiple series aluminum busbars 401. The negative electrode lead-out aluminum busbar 402, the positive electrode lead-out aluminum busbar 403, the negative electrode connecting aluminum busbar 404, the positive electrode connecting aluminum busbar 405, and the multiple series aluminum busbars 401 can be replaced with copper busbars.

[0025] The fusible element is a fusible aluminum busbar 406 or a fuse 5. The fusible aluminum busbar 406 has a fusible groove 4064. One end of the fusible aluminum busbar 406 is fixedly connected to the positive lead aluminum busbar 403 by a fixing screw 4061 and a fixing nut 4062. An insulating seat 4063 is fixedly installed on the outer wall of the sheet metal support assembly 42. The mating end of the fusible aluminum busbar 406 and the positive lead aluminum busbar 405 is fixedly connected to the insulating seat 4063 by a fixing screw 4061 to achieve stable insulation support and fixation.

[0026] The fuse groove 4064 is set according to the maximum cold start current (CCA) of the power battery pack, and an upper limit coefficient of 10-20% can also be reserved. Once the maximum value of the upper limit is exceeded, the fuse aluminum busbar 406 will automatically melt to protect the power battery pack. The fuse 5 is a finished product purchased externally.

[0027] The purpose of setting up fuses is to: prevent short circuits between the positive and negative electrodes of the power battery pack; prevent over-discharge from causing insufficient ion migration speed in the electrodes, increased internal resistance, and a drop in voltage plateau; prevent over-discharge from causing a rapid increase in battery surface temperature, which may lead to thermal runaway; prevent over-discharge from causing the graphite layer of the negative electrode to crack, resulting in a capacity decay of up to 30% after 200 cycles; prevent over-discharge from shortening the battery's cycle life; and prevent over-discharge from potentially causing battery overheating, sodium deposition, SEI film growth, and other problems, increasing the risk of explosion and fire.

[0028] The limiting component 41 includes multiple EVA 411, multiple epoxy boards 412, multiple MPP 413, and a top EVA 414. EVA 411 is attached to each side of the battery pack 44. Epoxy boards 412 are spaced between the EVA 411 and the sheet metal support component 42. Epoxy boards 412 are placed between the bottom surface of the battery pack 44 and the sheet metal support component 42. MPP 413 is sandwiched between the epoxy boards 412 and the bottom surface of the battery pack 44. Epoxy boards 412 are placed between the battery pack 44 and the busbar output component 40. A top EVA 414 is provided on the top of the battery pack 44.

[0029] The EVA411 is configured in various sizes depending on its placement. The EVA411 located on the two side facades where the battery pack 44 and the sheet metal support assembly 42 cooperate, covers the entire side facade of the battery pack 44 and has a thickness of 1 to 2 mm to prevent scratching the battery pack 44 during assembly. The EVA411 located on the two side facades where the battery pack 44 and the sheet metal support assembly 42 do not cooperate is configured as a strip with varying thicknesses of 1 to 5 mm to fill the gap between the battery pack 44 and the lower tank 1, ensuring that the battery pack 44 remains in a stable position.

[0030] The MPP413 is configured as a strip, with a glue gap between each MPP413. The battery pack 44 is bonded to the sheet metal support assembly 42 with structural adhesive to prevent the battery pack 44 from moving around in the sheet metal support assembly 42. At the same time, the strip-shaped MPP413 helps the battery pack 44 dissipate heat.

[0031] Both EVA411 and MPP413 have compressive elasticity. EVA411 is configured to adjust the dimensional tolerance of the battery pack 44 in the horizontal direction, while MPP413 is made of a relatively hard material to provide sufficient support for the battery pack 44 and adjust the dimensional tolerance in the vertical direction.

[0032] The epoxy board 412 is used for pressure resistance insulation to prevent the battery pack 44 from directly contacting the sheet metal support assembly 42. On the one hand, direct contact cannot meet the pressure resistance requirements, and on the other hand, avoiding direct contact can prevent the risk of short circuit of the battery pack 44 under vibration and impact conditions.

[0033] Both EVA411 and MPP413 are equipped with single-sided adhesive to achieve bonding. The epoxy board 412 is made of FR4 material, and CR can also be used for EVA411.

[0034] The sheet metal support assembly 42 has a U-shaped support bracket 421 with a flat bottom. Multiple feet 422 for connecting with the upper cover 2 are provided at the top edge of the sheet metal support bracket 421. The top of each foot 422 is horizontal.

[0035] The sheet metal bracket 421 is made of metal materials such as SGCC or SPCC to ensure the structural strength of the battery pack 44. Each support leg 422 is covered with a silicone pad or EVA 411 on the horizontal top surface that abuts against the top cover 2 for transition buffering, to prevent multiple sheet metal support legs 422 from scratching the top cover 2. In addition, the silicone pad and EVA 411 have a certain compressible elasticity, which can compensate for the dimensional error of the sheet metal bracket 421, so as to ensure that the battery pack 44 is stably located inside the shell.

[0036] The control component 43 is selected as either an equalization board or a BMS. The equalization board is a common equalization board used in sodium batteries on the market. It is also an active equalization board, which uses inductors, capacitors or transformers to transfer energy from high-voltage cells to low-voltage cells. It is highly efficient and energy-saving, but the circuit is complex and the cost is high. The BMS is an existing battery management system.

[0037] Differences in manufacturing processes and usage environments of individual battery cells 441 can lead to inconsistent internal resistance and capacity, which can accelerate battery aging over time. Control component 43 reduces the damage to individual cells caused by overcharging or over-discharging by adjusting voltage and charge state, thus extending the overall battery pack life. In addition, the total capacity of the battery pack 44 is limited by the worst-performing individual cell. The balancing technology of control component 43 makes the voltage of each individual battery cell 441 more consistent, avoiding the weakest link effect and maximizing the potential of the battery pack. Imbalance may lead to local overheating or overvoltage, causing the risk of thermal runaway. The balancing technology of control component 43 prevents individual battery cells from entering a dangerous state by dynamically adjusting energy distribution.

[0038] Multiple riveting holes 4121 are provided on the epoxy board 412 between the current collection component 40 and the battery pack 44. Riveting holes 4121 are also provided at the alignment points on the sheet metal bracket 421. Plastic rivets are riveted into the two aligned riveting holes 4121 to achieve a fixed connection between the epoxy board 412 and the sheet metal bracket 421.

[0039] Anti-slip bolts 408 are fixedly installed on both the negative electrode connecting aluminum busbar 404 and the positive electrode connecting aluminum busbar 405. The anti-slip bolts 408 on the negative electrode connecting aluminum busbar 404 are connected to the negative electrode post 201, and the anti-slip bolts 408 on the positive electrode connecting aluminum busbar 405 are connected to the positive electrode post 202.

[0040] Multiple through slots 4122 are formed on the epoxy plate 412 between the current output component 40 and the battery pack 44. The negative lead aluminum busbar 402, positive lead aluminum busbar 403, negative electrode connecting aluminum busbar 404, positive electrode connecting aluminum busbar 405 and multiple series aluminum busbars 401 are all aligned with the multiple through slots 4122 and have through slots. The tab of each battery cell 441 passes through the aligned through slots and through slots 4122 and is welded to the aligned negative lead aluminum busbar 402, positive lead aluminum busbar 403, negative electrode connecting aluminum busbar 404, positive electrode connecting aluminum busbar 405 or series aluminum busbar 401 respectively.

[0041] The epoxy board 412 is provided to achieve insulation, pressure resistance and positioning limit functions, and the width of the insertion groove is greater than or equal to the width of the through groove 4122.

[0042] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sodium-ion high-rate starting power supply battery pack, characterized in that: The battery module (4) includes a housing and a battery module (4) encapsulated inside the housing. The housing includes a lower barrel (1) and a top cover (2). The lower end of the battery module (4) is inserted into the lower barrel (1), and the bottom of the battery module (4) is bonded to the lower barrel (1). The top cover (2) covers the top opening of the lower barrel (1) to encapsulate the battery module (4). A negative terminal (201) and a positive terminal (202) connecting the inside and outside of the housing are fixedly provided on the top cover (2). A busbar lead-out assembly (40) and a negative terminal are provided on the battery module (4). (201) and positive terminal (202) are both connected, forming negative and positive terminals respectively. The electrical equipment is powered by connecting the negative terminal (201) and positive terminal (202) to the outside of the casing. The top cover (2) is hinged with a handle (3). The control component (43) of the battery module (4) is fixedly mounted on the sheet metal support component (42). The control component (43) is connected to the busbar output component (40) through the acquisition line (431) to achieve the drive and control connection of the battery group (44).

2. The sodium-ion high-rate starting power supply battery pack according to claim 1, characterized in that: The battery module (4) includes a busbar lead-out component (40), a limiting component (41), a sheet metal support component (42), a control component (43), and a battery pack (44). The battery pack (44) includes multiple battery cells (441) stacked and bonded along the thickness direction. Each battery cell (441) is a soft-pack sodium-ion battery. The busbar lead-out component (40) is connected to each battery cell (441). The limiting component (41) is covered and disposed on the four sides and bottom of the battery pack (44). The sheet metal support component (42) is U-shaped and mounted on the bottom and both sides of the battery pack (44). The sheet metal support component (42) is fastened to the outside of the limiting component (41).

3. The sodium-ion high-rate starting power supply battery pack according to claim 2, characterized in that: The busbar assembly (40) includes a negative lead-out aluminum busbar (402), a positive lead-out aluminum busbar (403), a negative electrode connecting aluminum busbar (404), a positive electrode connecting aluminum busbar (405), a fuse, and multiple series-connected aluminum busbars (401). The multiple series-connected aluminum busbars (401) are connected in series to multiple battery cells (441) to form a battery pack (44). The negative lead-out aluminum busbar (402) is fixedly disposed at the negative terminal of the battery pack (44), and the positive lead-out aluminum busbar is fixedly disposed at the positive terminal of the battery pack (44). One end of the negative electrode connecting aluminum busbar (404) is connected to the negative electrode post (201), and the other end of the negative electrode connecting aluminum busbar (404) is connected to the negative electrode lead-out aluminum busbar (402). One end of the positive electrode connecting aluminum busbar (405) is connected to the positive electrode post (202), and the other end of the positive electrode connecting aluminum busbar (405) is connected to the positive electrode lead-out aluminum busbar (403) through a fuse. The acquisition line (4301) is connected to the negative electrode lead-out aluminum busbar (402), the positive electrode lead-out aluminum busbar (403), and multiple series aluminum busbars (401).

4. The sodium-ion high-rate starting power supply battery pack according to claim 3, characterized in that: The fuse is made of aluminum busbar (406) or fuse (5). The aluminum busbar (406) has a fuse groove (4064). One end of the aluminum busbar (406) is fixedly connected to the positive lead aluminum busbar (403) by a fixing screw (4061) and a fixing nut (4062). An insulating seat (4063) is fixedly installed on the outer wall of the sheet metal support assembly (42). The mating end of the aluminum busbar (406) and the positive lead aluminum busbar (405) is fixedly connected to the insulating seat (4063) by a fixing screw (4061).

5. A sodium-ion high-rate starting power supply battery pack according to claim 4, characterized in that: The limiting component (41) includes multiple EVA (411), multiple epoxy boards (412) and multiple MPP (413). EVA (411) is attached to each side of the battery pack (44). Epoxy boards (412) are spaced between the EVA (411) and the sheet metal support component (42). Epoxy boards (412) are placed between the bottom surface of the battery pack (44) and the sheet metal support component (42). MPP (413) is sandwiched between the epoxy board (412) and the bottom surface of the battery pack (44). Epoxy boards (412) are placed between the battery pack (44) and the busbar output component (40).

6. The sodium-ion high-rate starting power supply battery pack according to claim 5, characterized in that: The sheet metal support assembly (42) has a U-shaped bottom with a flat bottom. Multiple feet (422) for connecting with the top cover (2) are provided at the top edge of the sheet metal support assembly (421). The top of each foot (422) is horizontal.

7. A sodium-ion high-rate starting power supply battery pack according to claim 6, characterized in that: The control component (43) is selected from either a balance board or a BMS.

8. A sodium-ion high-rate starting power supply battery pack according to claim 7, characterized in that: Multiple rivet holes (4121) are provided on the epoxy board (412) between the busbar lead-out component (40) and the battery pack (44). Rivet holes (4121) are also provided at the alignment position on the sheet metal bracket (421). Plastic rivets are riveted into the two aligned rivet holes (4121) to achieve a fixed connection between the epoxy board (412) and the sheet metal bracket (421).

9. A sodium-ion high-rate starting power supply battery pack according to claim 8, characterized in that: Anti-slip bolts (408) are fixedly installed on both the negative electrode connecting aluminum busbar (404) and the positive electrode connecting aluminum busbar (405). The anti-slip bolts (408) on the negative electrode connecting aluminum busbar (404) are connected to the negative electrode post (201), and the anti-slip bolts (408) on the positive electrode connecting aluminum busbar (405) are connected to the positive electrode post (202).

10. A sodium-ion high-rate starting power supply battery pack according to claim 9, characterized in that: Multiple through slots (4122) are opened on the epoxy plate (412) between the busbar lead-out component (40) and the battery pack (44). On the negative lead-out aluminum busbar (402), positive lead-out aluminum busbar (403), negative electrode docking aluminum busbar (404), positive electrode docking aluminum busbar (405) and multiple series aluminum busbars (401), through slots are opened in alignment with the multiple through slots (4122). The tab of each battery cell (441) passes through the aligned through slots and through slots (4122) and is welded to the aligned negative lead-out aluminum busbar (402), positive lead-out aluminum busbar (403), negative electrode docking aluminum busbar (404), positive electrode docking aluminum busbar (405) or series aluminum busbar (401).

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