A sodium ion battery pack and its voltage control system

Abstract

The invention relates to the technical field of battery packs, in particular to a sodium ion battery pack and a voltage control system thereof, wherein the sodium ion battery pack comprises a battery seat and a sealing cover, wherein an assembly frame is assembled in the battery seat, battery cells are arranged in the assembly frame, and series gaskets are installed at both ends of the assembly frame, a power connection slot and a positioning seat are arranged on the assembly frame, and a card slot is arranged on the sealing cover according to the distribution of the battery cells, and a sensor is installed in the card slot, a power connection column is arranged on the sensor, and a positioning foot is arranged on the sensor to be connected with an assembly structure on the positioning seat, a magnetic top plate is arranged on the top surface of the sensor, and a guide groove is arranged on the sealing cover, a replacement seat and a mounting seat arranged side by side are driven and installed on the guide groove, an electromagnetic plate is arranged in the replacement seat, and a push rod is obliquely arranged on the mounting seat, and a reserve slot and a recovery slot are installed on the battery seat, so as to achieve the purpose of optimizing the assembly process of the voltage monitoring sensor and ensuring that the sensor can be automatically replaced when damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a sodium ion battery pack and a voltage control system thereof. Background Art

[0002] Sodium-ion battery is a new type of high-performance battery with advantages such as high energy density, good safety and abundant materials. It is regarded as an important development direction in the future fields of electric vehicles and energy storage systems. Combining sodium-ion battery cells into battery packs is the main way to use sodium-ion batteries.

[0003] Voltage control is of great significance in sodium-ion battery packs. Ensuring the stability and consistency of the voltage of battery cells can effectively improve safety. During the charging and discharging process of sodium-ion battery packs, voltage fluctuations can cause reactions inside the battery, which may cause safety problems such as thermal runaway and short circuits. By accurately controlling the voltage, overcharging or overdischarging can be avoided, reducing the possibility of internal reactions in the battery, thereby improving the safety of the battery pack. However, in sodium-ion battery packs, the assembly of monitoring units for each battery cell is very cumbersome, the wiring process is complicated, and after the monitoring unit is damaged, the process of replacing it with a new one will also affect the normal use of the battery pack. Summary of the invention

[0004] The purpose of the present invention is to provide a sodium ion battery pack and a voltage control system thereof, so as to optimize the assembly process of the voltage monitoring sensor and ensure that the sensor can be automatically replaced when damaged, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sodium ion battery pack, comprising a battery seat and a sealing cover, wherein an assembly frame is assembled in the battery seat, and a battery cell is arranged in the assembly frame, and series gaskets are installed at both ends of the assembly frame to connect with the battery cell, a controller is installed on the battery seat, and the controller is electrically connected to the battery cell, a power connection slot and a positioning seat are arranged on the assembly frame, and a card slot is arranged on the sealing cover according to the distribution of the battery cell, and a sensor is installed in the card slot, and a power connection post is arranged on the sensor, and the power connection post is inserted into the power connection slot The sensor can be connected in parallel with the battery cell, the sensor is provided with a positioning foot connected to the assembly structure on the positioning seat, and the assembly structure can be unlocked by magnetic force, the top surface of the sensor is provided with a magnetic top plate, and the sealing cover is provided with a guide groove, the guide groove is driven to install a replacement seat and a matching seat arranged side by side, and an electromagnetic plate is provided in the replacement seat, and a push rod is obliquely provided on the matching seat, the electromagnetic plate and the push rod are controlled by a controller, and a reserve slot and a recovery slot are installed on the battery seat, the reserve slot and the recovery slot can supply and recover the sensor respectively.

[0006] Preferably, the sealing cover is assembled on the top surface of the battery seat, and a positioning base is provided on the battery seat, a limited assembly groove is provided in the battery seat, and the assembly frame is arranged in the limited assembly groove.

[0007] Preferably, the battery cells are arranged in an assembly frame, and adjacent battery cells are connected to each other via series gaskets. The controller is installed at the end of the battery holder, and the controller, the battery cells and the sensor are in the same circuit.

[0008] Preferably, the power connection slot and the positioning seat are both arranged on the top surfaces of both sides of the assembly frame, and the card slot is located above the battery cell. The sensor is a voltage sensor, and a sealing structure is arranged on the side wall of the sensor.

[0009] Preferably, a limiting hole is provided at the bottom of the positioning foot, and a positioning groove is provided on the positioning seat, the positioning foot can be inserted into the positioning groove, a wedge-shaped block is movably installed on the positioning seat through a spring guide rod, and the wedge-shaped block can be connected to the limiting hole.

[0010] Preferably, a slide groove is provided on the positioning seat, and a pull rod is movably installed in the slide groove, the pull rod is connected to the end of the spring guide rod through a traction line, and a magnetic end block is provided on the pull rod.

[0011] Preferably, the guide groove is horizontally arranged in the middle of the sealing cover, and a screw pair is arranged in the guide groove, a nut seat is connected to the screw pair, and the replacement seat and the matching seat are installed on the nut seat.

[0012] Preferably, the electromagnetic plate is installed on the top of the replacement seat, and the push rod is an electric push rod, and the push rod is installed obliquely on the side wall of the mounting seat.

[0013] Preferably, the reserve slot is vertically arranged, and spare sensors are stacked in the reserve slot, the recovery slot is located at the end of the battery holder, and an inclined guide plate is arranged on the recovery slot.

[0014] A voltage control system for a sodium ion battery pack, the voltage control system comprising: a battery management system for monitoring, managing and controlling the operating state of the entire battery pack; a voltage sensor for real-time monitoring the voltage of each single cell of the battery pack; a current sensor for real-time monitoring the charge and discharge current of the battery pack; a voltage management module for managing and controlling the overall voltage of the battery pack according to a feedback signal of the voltage sensor; a charge and discharge control module for controlling the charge and discharge process of the battery pack according to a feedback signal of the current sensor; and a protection module for protecting the safe operation of the battery pack.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In the sodium ion battery pack of the present invention, the battery cells are sub-assembled in an assembly frame with a power connection structure, which can complete the assembly work more quickly and accurately, and the sensor can be quickly assembled without wiring through the assembly frame, saving the time cost of the early assembly and later maintenance of the voltage control system, and ensuring that the voltage control system can work normally.

[0017] 2. The assembly frame of the present invention is a structure for small-scale assembly of battery cells. After the battery cells are installed therein, the positive and negative poles are connected to the series gaskets, so that the battery cells are connected in series by utilizing the external wiring of the series gaskets. After the battery cells are connected in series, they are connected to the controller, and the charging and discharging of the batteries can be managed by the controller. At the same time, the positive and negative poles of the battery are partially exposed on the assembly frame through the power connection slot, and the power connection post of the sensor is inserted into the power connection slot, so that the parallel installation of the sensor can be completed quickly, and the voltage of each battery cell can be monitored without separate wiring.

[0018] 3. The sensor of the present invention can be connected to the power supply and fixed by connecting the power supply column with the power supply slot, and connecting the positioning foot with the positioning seat. When a sensor is damaged, the replacement seat can be moved to the position of the sensor after positioning by the voltage control system. The sensor can be automatically disassembled through magnetic force, and a new sensor can be automatically installed through the mounting seat, ensuring that the voltage control system can maintain voltage monitoring of each battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the battery base and battery cell structure of the present invention.

[0021] Figure 3 It is a schematic diagram of the battery base structure of the present invention.

[0022] Figure 4 Schematic diagram of the battery cell structure of the present invention.

[0023] Figure 5 It is a schematic diagram of the positioning seat structure of the present invention.

[0024] Figure 6 It is a schematic diagram of the sealing cover and sensor structure of the present invention.

[0025] Figure 7 Schematic diagram of the sealing cover structure of the present invention.

[0026] Figure 8 Schematic diagram of the sensor structure of the present invention.

[0027] Fig. 9It is a schematic diagram of the installation of the replacement seat and the mounting seat structure of the present invention.

[0028] Fig.10 It is a schematic diagram of the replacement seat and the mounting seat structure of the present invention.

[0029] Fig.11 It is a block diagram of the voltage control system of the present invention.

[0030] In the figure: 1. battery holder; 2. sealing cover; 3. positioning base; 4. assembly frame; 5. battery cell; 6. series gasket; 7. controller; 8. power connection slot; 9. positioning seat; 10. card slot; 11. sensor; 12. power connection column; 13. positioning slot; 14. positioning foot; 15. limit hole; 16. wedge-shaped card block; 17. spring guide rod; 18. slide slot; 19. pull rod; 20. traction line; 21. magnetic end block; 22. magnetic top plate; 23. guide slot; 24. screw pair; 25. nut seat; 26. replacement seat; 27. mounting seat; 28. electromagnetic plate; 29. ​​push rod; 30. reserve slot; 31. recovery slot. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment. It should be noted that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] See also Figures 1 to 11The present invention provides a technical solution: a sodium ion battery pack, including a battery seat 1 and a sealing cover 2, wherein an assembly frame 4 is assembled in the battery seat 1, and a battery cell 5 is arranged in the assembly frame 4, and two ends of the assembly frame 4 are equipped with series gaskets 6 connected to the battery cell 5, a controller 7 is installed on the battery seat 1, and the controller 7 is electrically connected to the battery cell 5, a power connection slot 8 and a positioning seat 9 are arranged on the assembly frame 4, and a card slot 10 is arranged on the sealing cover 2 according to the distribution of the battery cell 5, and a sensor 11 is installed in the card slot 10, and a power connection post 12 is arranged on the sensor 11, and when the power connection post 12 is inserted into the power connection slot 8, the sensor 1 can be 1 is connected in parallel with the battery cell 5, a positioning foot 14 is provided on the sensor 11 and connected with the assembly structure on the positioning seat 9, and the assembly structure can be unlocked by magnetic force, a magnetic top plate 22 is provided on the top surface of the sensor 11, and a guide groove 23 is provided on the sealing cover 2, a replacement seat 26 and a matching seat 27 arranged side by side are driven and installed on the guide groove 23, an electromagnetic plate 28 is provided in the replacement seat 26, and a push rod 29 is obliquely provided on the matching seat 27, the electromagnetic plate 28 and the push rod 29 are controlled by the controller 7, and a reserve slot 30 and a recovery slot 31 are installed on the battery holder 1, and the reserve slot 30 and the recovery slot 31 can respectively supply and recover the sensor 11.

[0033] The sealing cover 2 is assembled on the top surface of the battery holder 1 , and a positioning base 3 is arranged on the battery holder 1 . A limited assembly groove is arranged in the battery holder 1 , and an assembly frame 4 is arranged in the limited assembly groove.

[0034] The sodium ion battery pack of the present invention uses a battery holder 1 and a sealing cover 2 as a basic frame, and encapsulates a battery cell 5 therein. The battery cell 5 is sub-assembled in an assembly frame 4 with a power connection structure, which can complete the assembly work more quickly and accurately, and the sensor 11 can be quickly assembled without wiring through the assembly frame 4, saving the time cost of the early assembly and later maintenance of the voltage control system.

[0035] The battery cells 5 are arranged in an assembly frame 4 , and adjacent battery cells 5 are connected to each other via series gaskets 6 . The controller 7 is installed at the end of the battery holder 1 , and the controller 7 , the battery cells 5 and the sensor 11 are in the same circuit.

[0036] The assembly frame 4 of the present invention is a structure for small-scale assembly of battery cells 5. After the battery cells 5 are installed therein, the positive and negative poles are connected to the series gasket 6, so that the battery cells 5 are connected in series by utilizing the external wiring of the series gasket 6. After the battery cells 5 are connected in series, they are connected to the controller 7, and the charging and discharging management of the battery can be performed by the controller 7. At the same time, the positive and negative poles of the battery are partially exposed on the assembly frame 4 through the power connection slot 8, and the power connection post 12 of the sensor 11 is inserted into the power connection slot 8, so that the parallel installation of the sensor 11 can be completed quickly, and the voltage of each battery cell 5 can be monitored without separate wiring.

[0037] The power connection slot 8 and the positioning seat 9 are both arranged on the top surfaces of both sides of the assembly frame 4, and the card slot 10 is located above the battery cell 5. The sensor 11 is a voltage sensor 11, and a sealing structure is arranged on the side wall of the sensor 11.

[0038] The sensor 11 is installed by relying on the card slot 10 on the sealing cover 2. After the sealing cover 2 is closed on the battery holder 1, the sensor 11 is inserted into the card slot 10 in turn. The sensor 11 can be connected to the power connection column 12 and the power connection slot 8, and the positioning foot 14 and the positioning seat 9 to complete the power connection and fixation work.

[0039] A limiting hole 15 is provided at the bottom of the positioning foot 14, and a positioning groove 13 is provided on the positioning seat 9, and the positioning foot 14 can be inserted into the positioning groove 13. A wedge-shaped block 16 is movably installed on the positioning seat 9 through a spring guide rod 17, and the wedge-shaped block 16 can be connected to the limiting hole 15. A slide groove 18 is provided on the positioning seat 9, and a pull rod 19 is movably installed in the slide groove 18. The pull rod 19 is connected to the end of the spring guide rod 17 through a traction line 20, and a magnetic end block 21 is provided on the pull rod 19.

[0040] The positioning foot 14 can be inserted into the positioning groove 13 of the positioning seat 9. When it is inserted, the wedge-shaped block 16 is first pushed to both sides, and then under the elastic force of the spring guide rod 17, the wedge-shaped block 16 is automatically inserted into the limiting hole 15 of the positioning foot 14, fixing the positioning foot 14 and quickly completing the installation of the sensor 11. If a certain sensor 11 is damaged, after positioning by the voltage control system, the replacement seat 26 is moved to the position of the sensor 11, and the generated magnetic force can act on the magnetic end block 21, so that the pull rod 19 moves in the slide groove 18, and the traction line 20 is used to pull the spring guide rod 17 to pull the wedge-shaped block 16 out of the limiting hole 15, so that the positioning foot 14 can be pulled out of the positioning groove 13, and the sensor 11 completes the automatic disassembly work.

[0041] The guide groove 23 is horizontally arranged in the middle of the sealing cover 2 , and a screw pair 24 is arranged in the guide groove 23 . A nut seat 25 is connected to the screw pair 24 , and a replacement seat 26 and a matching seat 27 are installed on the nut seat 25 .

[0042] The replacement seat 26 is driven by the guide groove 23 and the screw pair 24 in the guide groove 23. When it is detected that a certain sensor 11 has lost its monitoring ability, the screw pair 24 drives the nut seat 25 to move in the guide groove 23, so that the replacement seat 26 is moved to the position of the bad sensor 11 to replace the sensor 11.

[0043] The electromagnetic plate 28 is installed on the top of the replacement seat 26 , and the push rod 29 adopts an electric push rod 29 , and the push rod 29 is obliquely installed on the side wall of the mounting seat 27 .

[0044] The replacement seat 26 is made of a material with a magnetic shielding effect, which can limit the magnetic force of the electromagnetic plate 28 therein. When the replacement seat 26 is at the broken sensor 11, the electromagnetic seat is energized, and the magnetic attraction force generated on the magnetic end block 21 can unlock the assembly structure. Then the magnetic force of the electromagnetic seat can act on the magnetic top plate 22 of the sensor 11, so that the sensor 11 is pulled by the magnetic force and enters the replacement seat 26. Then, the broken sensor 11 is sent to the recovery slot 31 through the movement guidance of the replacement seat 26.

[0045] The reserve slot 30 is vertically arranged, and the spare sensors 11 are stacked in the reserve slot 30 . The recovery slot 31 is located at the end of the battery holder 1 , and an inclined guide plate is arranged on the recovery slot 31 .

[0046] Correspondingly, the mounting seat 27 can install a new sensor 11. The mounting seat 27 can be moved to the bottom of the reserve slot 30, and the sensor 11 is lowered into the mounting seat 27 through the reserve slot 30. Then the mounting seat 27 moves the sensor 11 to the empty slot 10 position, and the sensor 11 is pushed into the slot 10 through the push rod 29, so as to quickly complete the replacement and installation work and ensure that the voltage control system can work normally.

[0047] A voltage control system for a sodium ion battery pack, the voltage control system comprising:

[0048] Battery management system: responsible for monitoring, managing and controlling the operating status of the entire battery pack, including monitoring and control of battery voltage, temperature, current and other parameters.

[0049] Voltage sensor: used to monitor the voltage of each single cell of the battery pack in real time, so as to detect abnormal conditions in time and take control.

[0050] Current sensor: used to monitor the charge and discharge current of the battery pack in real time in order to control the charge and discharge process of the battery pack.

[0051] Voltage management module: manages and controls the overall voltage of the battery pack based on the feedback signal from the voltage sensor.

[0052] Charge and discharge control module: controls the charge and discharge process of the battery pack according to the feedback signal of the current sensor to ensure that it is carried out within a safe range.

[0053] Protection module: includes battery overcharge protection, over-discharge protection, over-temperature protection and other functions, used to protect the safe operation of the battery pack.

[0054] The voltage control system is mainly arranged in the controller 7, which is responsible for the logic control and instruction execution of the entire voltage control system to ensure the normal operation and control of the system.

[0055] When the sodium ion battery pack of the present invention is used: first, the sodium ion battery pack of the present invention uses the battery holder 1 and the sealing cover 2 as the basic frame, and the battery cells 5 are encapsulated therein. The battery cells 5 are sub-assembled in the assembly frame 4 with the power connection structure, which can complete the assembly work more quickly and accurately, and the sensor 11 can be quickly assembled without wiring through the assembly frame 4, saving the time cost of the early assembly and later maintenance of the voltage control system. The assembly frame 4 is a structure for small-scale assembly of the battery cells 5. After the battery cells 5 are installed therein, the positive and negative electrodes are connected to the series gasket 6, so that the external wiring of the series gasket 6 is used to connect the battery cells 5 in series. After the battery cells 5 are connected in series, they are connected to the controller 7, and the controller 7 can be used for power supply. The charging and discharging management of the battery. At the same time, the positive and negative poles of the battery are exposed through the power connection slot 8 on the assembly frame 4. The power connection post 12 of the sensor 11 is inserted into the power connection slot 8, and the parallel installation of the sensor 11 can be quickly completed. The voltage of each battery cell 5 can be monitored without separate wiring. The sensor 11 is installed by relying on the card slot 10 on the sealing cover 2. After the sealing cover 2 is closed on the battery holder 1, the sensor 11 is inserted into the card slot 10 in turn. The sensor 11 can be connected to the power connection slot 8 through the connection of the power connection post 12 and the connection of the positioning foot 14 and the positioning seat 9 to complete the power connection and fixation work. The positioning foot 14 can be inserted into the positioning slot 13 of the positioning seat 9. When it is inserted, the wedge-shaped card block 16 is first pushed to both sides, and then Then, under the elastic force of the spring guide rod 17, the wedge-shaped block 16 is automatically inserted into the limiting hole 15 of the positioning foot 14, fixing the positioning foot 14, and quickly completing the installation of the sensor 11. If a certain sensor 11 is damaged, after positioning by the voltage control system, the replacement seat 26 is moved to the position of the sensor 11, and the generated magnetic force can act on the magnetic end block 21, so that the pull rod 19 moves in the slide groove 18, and the spring guide rod 17 is pulled by the traction line 20 to pull the wedge-shaped block 16 out of the limiting hole 15, so that the positioning foot 14 can be pulled out of the positioning groove 13, and the sensor 11 completes the automatic disassembly work, and the replacement seat 26 is limited by the guide groove 23 and the screw pair 24 in the guide groove 23. When it is detected After a certain sensor 11 loses its monitoring capability, the nut seat 25 is driven to move in the guide groove 23 by the screw pair 24, so that the replacement seat 26 is moved to the position of the bad sensor 11 to replace the sensor 11. The replacement seat 26 is made of a material with a magnetic shielding effect as a whole, which can limit the magnetic force of the electromagnetic plate 28 therein. When the replacement seat 26 is at the bad sensor 11, the electromagnetic seat is energized, and the magnetic attraction generated on the magnetic end block 21 can unlock the assembly structure. Then the magnetic force of the electromagnetic seat can act on the magnetic top plate 22 of the sensor 11, so that the sensor 11 is pulled by the magnetic force and enters the replacement seat 26. Then, the bad sensor 11 is sent to the recovery slot 31 through the movement guidance of the replacement seat 26. Correspondingly,The mounting seat 27 can be used to install a new sensor 11. The mounting seat 27 can be moved to the bottom of the reserve slot 30, and the sensor 11 is placed into the mounting seat 27 through the reserve slot 30. Then, the mounting seat 27 moves the sensor 11 to the empty slot 10, and the push rod 29 pushes the sensor 11 into the slot 10, so as to quickly complete the replacement and installation work and ensure that the voltage control system can work normally.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sodium ion battery pack, comprising a battery holder (1) and a sealing cover (2), characterized in that: The battery seat (1) is equipped with an assembly frame (4), and a battery cell (5) is arranged in the assembly frame (4), and two ends of the assembly frame (4) are equipped with series gaskets (6) connected to the battery cell (5), the battery seat (1) is equipped with a controller (7), and the controller (7) is electrically connected to the battery cell (5), the assembly frame (4) is equipped with a power connection slot (8) and a positioning seat (9), and the sealing cover (2) is equipped with a card slot (10) according to the distribution of the battery cell (5), and a sensor (11) is installed in the card slot (10), and the sensor (11) is provided with a power connection post (12), and when the power connection post (12) is inserted into the power connection slot (8), the sensor (11) can be connected in parallel with the battery cell (5), and the sensor ( The sensor (11) is provided with a positioning foot (14) connected to an assembly structure on a positioning seat (9), and the assembly structure can be unlocked by magnetic force, the top surface of the sensor (11) is provided with a magnetic top plate (22), and the sealing cover (2) is provided with a guide groove (23), the guide groove (23) is driven to install a replacement seat (26) and a matching seat (27) arranged side by side, and an electromagnetic plate (28) is provided in the replacement seat (26), and a push rod (29) is obliquely provided on the matching seat (27), the electromagnetic plate (28) and the push rod (29) are controlled by a controller (7), and a storage tank (30) and a recovery tank (31) are installed on the battery seat (1), and the storage tank (30) and the recovery tank (31) can respectively supply and recover the sensor (11); A limiting hole (15) is provided at the bottom of the positioning foot (14), and a positioning groove (13) is provided on the positioning seat (9), the positioning foot (14) can be inserted into the positioning groove (13), a wedge-shaped clamping block (16) is movably mounted on the positioning seat (9) via a spring guide rod (17), and the wedge-shaped clamping block (16) can be connected to the limiting hole (15); The positioning seat (9) is provided with a slide groove (18), and a pull rod (19) is movably installed in the slide groove (18), the pull rod (19) is connected to the end of the spring guide rod (17) through a traction line (20), and a magnetic end block (21) is provided on the pull rod (19); The guide groove (23) is horizontally arranged in the middle of the sealing cover (2), and a screw rod pair (24) is arranged in the guide groove (23), a nut seat (25) is connected to the screw rod pair (24), and a replacement seat (26) and a matching seat (27) are installed on the nut seat (25); The electromagnetic plate (28) is mounted on the top of the replacement seat (26), and the push rod (29) is an electric push rod (29), and the push rod (29) is tiltedly mounted on the side wall of the mounting seat (27).

2. A sodium ion battery pack according to claim 1, characterized in that: The sealing cover (2) is assembled on the top surface of the battery seat (1), and a positioning base (3) is provided on the battery seat (1). A limited position assembly groove is provided in the battery seat (1), and the assembly frame (4) is arranged in the limited position assembly groove.

3. A sodium ion battery pack according to claim 1, characterized in that: The battery cells (5) are arranged in an assembly frame (4), and adjacent battery cells (5) are connected to each other via series gaskets (6). The controller (7) is installed at the end of the battery holder (1), and the controller (7) is in the same circuit as the battery cells (5) and the sensor (11).

4. A sodium ion battery pack according to claim 1, characterized in that: The power connection slot (8) and the positioning seat (9) are both arranged on the top surfaces of both sides of the assembly frame (4), and the card slot (10) is located above the battery cell (5). The sensor (11) is a voltage sensor (11), and a sealing structure is arranged on the side wall of the sensor (11).

5. A sodium ion battery pack according to claim 1, characterized in that: The reserve slot (30) is arranged vertically, and spare sensors (11) are stacked in the reserve slot (30); the recovery slot (31) is located at the end of the battery seat (1), and an inclined guide plate is arranged on the recovery slot (31).

6. A voltage control system for a sodium ion battery pack according to any one of claims 1 to 5, characterized in that: The voltage control system includes: Battery management system, which is used to monitor, manage and control the operating status of the entire battery pack; Voltage sensor, used to monitor the voltage of each single cell of the battery pack in real time; Current sensor, used to monitor the charge and discharge current of the battery pack in real time; A voltage management module is used to manage and control the overall voltage of the battery pack according to the feedback signal of the voltage sensor; A charge and discharge control module, used to control the charge and discharge process of the battery pack according to the feedback signal of the current sensor; Protection module, used to protect the safe operation of the battery pack.

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