Adaptive multi-temperature working condition sodium-ion battery ac pulse internal heating control module

Abstract

The utility model provides a kind of sodium ion battery alternating current pulse internal heating control module suitable for multiple temperature conditions, it is related to battery management and thermal management technical field.The utility model directly generates alternating current in the both ends of sodium ion battery pack by alternating current pulse generation unit, realizes spontaneous heating using sodium ion battery pack internal impedance, and heating rate is much higher than traditional external heating mode, so it can be adapted to multiple temperature conditions such as low temperature (-20 ℃ to-40 ℃);Filter unit effectively smooths the waveform of alternating current, reduces the possible electrochemical polarization side reaction of high-frequency alternating current to sodium ion battery pack;Hardware interlock unit passes through hardware logic circuit, to avoid absolute dependence on software logic, eliminate the conflict short circuit of the alternating current loop for heating and main charge-discharge loop working simultaneously at physical level, greatly improve the electrical reliability and safety of system under multiple temperature severe conditions.

Description

Technical Field

[0001] This utility model relates to the field of battery management and thermal management technology, and in particular to an AC pulse internal heating control module for sodium-ion batteries that is adapted to multiple temperature conditions. Background Technology

[0002] Sodium-ion batteries are widely used in energy storage systems and low-speed electric vehicles. At room temperature, sodium-ion batteries exhibit good rate charge-discharge performance. However, at low temperatures ranging from -20°C to -40°C, the viscosity of the electrolyte inside the sodium-ion battery increases, the ion diffusion rate decreases, and the charge transfer resistance at the electrode-electrolyte interface increases. This leads to a reduction in the battery's usable discharge capacity and output power. Furthermore, high-current charging at low temperatures easily results in sodium dendrite deposition. The deposited sodium dendrites consume active materials and reduce battery life, and pose a safety hazard of puncturing the separator and causing an internal short circuit. Therefore, low-temperature preheating of sodium-ion batteries is necessary.

[0003] Currently, most common battery heating technologies employ external heat conduction methods, such as applying a PTC (Positive Temperature Coefficient) heating film to the outside of the battery cell or laying a liquid thermal plate at the bottom of the battery module. In this approach, heat must be conducted through the battery casing and multiple internal structures to the inside of the cell, resulting in a long heat transfer path and high thermal resistance. This leads to increased heating time, reduced energy utilization efficiency, and the formation of a temperature gradient within the cell. Uneven internal temperature distribution can cause mechanical stress imbalances, affecting battery life. Furthermore, the added heating films, pipes, and other components increase the size and structural complexity of the battery pack, reducing the overall energy density of the system.

[0004] Another heating method is to use alternating current pulses to generate Joule heat inside the battery (i.e., internal self-heating). Alternating current passes through the battery and generates heat using the battery's ohmic and polarization resistance. The heat generation sites are distributed at the electrode active interfaces, resulting in a high heating rate and a more uniform internal temperature distribution, thus reducing the temperature gradient.

[0005] However, existing AC self-heating systems have the following drawbacks: First, some AC heating solutions require external bidirectional inverters or alternating signal generators, which occupy a large space, have low system integration, and are difficult to integrate directly into the battery pack. Second, existing heating control logic mainly relies on the software algorithm of the microcontroller unit (MCU) in the Battery Management System (BMS), using software instructions to control contactors and switching transistors to switch between heating and normal charging / discharging modes. In operating environments with electromagnetic interference, the microcontroller may experience program execution errors, crashes, or resets. If the AC pulse heating circuit is accidentally triggered when the main charging / discharging circuit contactor is closed, a short-circuit conflict will occur between the DC main charging / discharging circuit and the high-frequency heating circuit, potentially damaging power devices or causing battery thermal runaway. Therefore, the current technology lacks an AC internal heating module with high integration and error-proofing protection achieved through pure hardware circuitry. Utility Model Content

[0006] In view of this, the technical problem to be solved by this utility model is: how to achieve efficient, uniform and safe internal heating of sodium-ion batteries in a low-temperature environment, so as to solve the technical problems of low heating efficiency, uneven temperature distribution, low system integration and reliance on software control in the prior art.

[0007] This utility model provides an AC pulse internal heating control module for sodium-ion batteries adapted to multiple temperature conditions, comprising: a sodium-ion battery pack; an AC pulse generating unit, whose two ends are electrically connected to the positive and negative terminals of the sodium-ion battery pack respectively, for generating an alternating current passing through the sodium-ion battery pack, one end of the sodium-ion battery pack being connected to a main charging and discharging circuit, the main charging and discharging circuit being connected in parallel with the AC pulse generating unit; a filtering unit, connected in series in the circuit between the AC pulse generating unit and the sodium-ion battery pack, for smoothing and filtering the alternating current; and a hardware interlocking unit, electrically connected to the contactors of the AC pulse generating unit and the main charging and discharging circuit respectively, for blocking the closing action of the contactors through hardware logic circuits when a heating command is received, thereby physically blocking the closing of the main charging and discharging circuit and preventing it from conflicting with the alternating current circuit of the AC pulse generating unit and short-circuiting.

[0008] Optionally, the AC pulse generation unit adopts an H-bridge topology and includes a first power switch, a second power switch, a third power switch, and a fourth power switch; the first power switch and the third power switch form the first arm of the H-bridge topology, and the second power switch and the fourth power switch form the second arm of the H-bridge topology.

[0009] Optionally, the filter unit adopts an LC series resonant circuit, and the filter unit includes an inductor and a capacitor connected in series; one end of the inductor is connected to the common terminal of the first power switch and the third power switch, the other end of the inductor is connected to one end of the capacitor, the other end of the capacitor is connected to one pole of the sodium-ion battery pack, and the common terminal of the second power switch and the fourth power switch is connected to the other pole of the sodium-ion battery pack.

[0010] Optionally, the hardware interlock unit includes a NAND gate logic circuit and a driver chip; the input terminals of the NAND gate logic circuit receive a heating enable command and a contactor status signal respectively, and the output terminal is connected to the driver chip. The driver chip is used to disconnect the contactor when the input signal does not meet the safety conditions, thereby physically blocking the closure of the main charging and discharging circuit.

[0011] Optionally, the first power switch, the second power switch, the third power switch, and the fourth power switch are all silicon carbide MOSFETs.

[0012] Optionally, it also includes a controller, which is electrically connected to the AC pulse generating unit via a pulse width modulation signal line.

[0013] Optionally, the AC pulse generation unit and the filtering unit are integrated on the same metal-based printed circuit board.

[0014] The benefits of implementing this invention include the following: This invention generates alternating current directly across the sodium-ion battery pack via an AC pulse generation unit, utilizing the internal impedance of the sodium-ion battery pack to achieve self-heating, resulting in a heating rate far exceeding that of traditional external heating methods. The filtering unit effectively smooths the waveform of the alternating current, reducing potential electrochemical polarization side reactions caused by high-frequency alternating current to the sodium-ion battery pack, thus minimizing damage. The hardware interlocking unit, through hardware logic circuitry, avoids absolute dependence on software logic, physically preventing conflicting short circuits between the alternating current loop used for heating and the main charging / discharging loop, significantly improving the electrical reliability and safety of the system under harsh multi-temperature conditions. The synergistic operation of these technical features achieves efficient, uniform, and safe internal heating of the sodium-ion battery pack, solving the problems of performance degradation and safety risks associated with sodium-ion batteries in low-temperature environments. Therefore, this invention's sodium-ion battery AC pulse internal heating control module, while meeting the requirements of conventional operating environments, can also adapt to multi-temperature conditions, including low temperatures (-20℃ to -40℃). Attached Figure Description

[0015] Figure 1 As shown in one embodiment, the global connection topology of the sodium-ion battery AC pulse internal heating control module of this utility model is as follows: Figure 2This is a schematic diagram of the circuit principle of the filtering unit and the AC pulse generating unit of the present invention in one embodiment; Figure 3 This is a logic block diagram of the hardware interlock unit of the present invention in one embodiment.

[0016] In the picture: 1. Sodium-ion battery pack; 2. AC pulse generation unit; 201. First power switch; 202. Second power switch; 203. Third power switch; 204. Fourth power switch; 3. Filtering unit; 301. Inductor; 302. Capacitor; 4. Hardware interlocking unit; 401. NAND gate logic circuit; 402. Driver chip; 5. Controller; 6. Main charging and discharging circuit; 7. Contactor. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The step numbers in the following embodiments are only for ease of explanation and do not limit the order of the steps. The execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.

[0018] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0019] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0021] In this embodiment, as Figure 1 The sodium-ion battery AC pulse internal heating control module adapted to multiple temperature conditions, shown, includes: The AC pulse generating unit 2 is electrically connected to the positive and negative terminals of the sodium-ion battery pack 1, respectively, and is used to generate a high-frequency alternating current (AC) passing through the sodium-ion battery pack 1. One end of the sodium-ion battery pack 1 is connected to the main charging and discharging circuit 6, which is connected in parallel with the AC pulse generating unit 2. The filter unit 3 is connected in series in the circuit between the AC pulse generation unit 2 and the sodium-ion battery pack 1, and is used to smooth and filter the high-frequency alternating current. The hardware interlock unit 4 is electrically connected to the contactor 7 of the AC pulse generating unit 2 and the main charging and discharging circuit 6, respectively. When a heating command is received, the hardware logic circuit blocks the closing action of the contactor 7 of the main charging and discharging circuit 6, thereby physically blocking the closing of the main charging and discharging circuit 6 and preventing the main charging and discharging circuit 6 from conflicting and short-circuiting with the alternating current circuit of the AC pulse generating unit 2.

[0022] In this embodiment, the frequency of the high-frequency alternating current is 1 kHz to 10 kHz.

[0023] In this embodiment, as Figure 1 As shown, the sodium-ion battery AC pulse internal heating control module also includes a controller 5, which is electrically connected to the AC pulse generation unit 2 via a pulse width modulation (PWM) signal line. The PWM output port of the controller 5 is electrically connected to the isolation drive terminal of the AC pulse generation unit 2 via a signal line, and achieves bidirectional signal interaction with the hardware interlock unit 4.

[0024] In this embodiment, as Figure 1 As shown, the AC pulse generation unit 2 serves as the core of power conversion. Its DC side input and output terminals are connected to the positive and negative bus of the sodium-ion battery pack 1 via high-voltage copper busbars, forming an alternating current circuit in parallel with the main charging and discharging circuit 6.

[0025] In this embodiment, as Figure 1As shown, the filter unit 3 is connected in series in the energy transmission circuit between the AC side of the AC pulse generation unit 2 and the sodium-ion battery pack 1, and is used to shape and filter the high-frequency alternating current.

[0026] In this embodiment, the high-heat-generating components of the AC pulse generation unit 2 and the filtering unit 3 are highly integrated on the same printed circuit board assembly (PCBA) with an aluminum-based heat dissipation substrate to optimize parasitic inductance under high current and high-frequency switching.

[0027] In this embodiment, as Figure 2 As shown, the AC pulse generation unit 2 adopts an H-bridge topology. The AC pulse generation unit 2 includes a first power switch 201, a second power switch 202, a third power switch 203, and a fourth power switch 204. The first power switch 201 and the third power switch 203 form the first arm of the H-bridge topology, and the second power switch 202 and the fourth power switch 204 form the second arm of the H-bridge topology.

[0028] Specifically, the drain of the first power switch 201 is connected in common with the drain of the second power switch 202, and is connected to the positive terminal of the sodium-ion battery pack 1. The source of the first power switch 201 is electrically connected to the drain of the third power switch 203, and their common connection point forms the midpoint of the first bridge arm; the first power switch 201 and the third power switch 203 are connected in series to form the first bridge arm of the H-bridge topology; the source of the second power switch 202 is electrically connected to the drain of the fourth power switch 204, and their common connection point forms the midpoint of the second bridge arm; the second power switch 202 and the fourth power switch 204 are connected in series to form the second bridge arm of the H-bridge topology. The source of the third power switch 203 is connected in common with the source of the fourth power switch 204, and is electrically connected to the negative terminal of the sodium-ion battery pack 1.

[0029] In this embodiment, because the charge transfer impedance of the sodium-ion battery pack 1 increases significantly at low temperatures (e.g., -20°C to -40°C), an alternating current with a frequency in the range of 1kHz to 10kHz needs to be applied during the heating process. In this embodiment, the first power switch 201, the second power switch 202, the third power switch 203, and the fourth power switch 204 are all silicon carbide (SiC) MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) devices with a withstand voltage of 1200V. The high electron mobility of SiC material enables it to maintain extremely low switching losses even at switching frequencies above 10kHz, effectively preventing overheating failure of the internal heating control module of the sodium-ion battery's AC pulse.

[0030] In this embodiment, as Figure 3 As shown, controller 5 outputs a complementary PWM drive signal with a dead time (e.g., 2 microseconds to 5 microseconds to prevent shoot-through between the upper and lower transistors). When the first power switch 201 and the fourth power switch 204 are turned on, the current flows in the forward direction through the sodium-ion battery pack 1; subsequently, after the dead time, the second power switch 202 and the third power switch 203 are turned on, and the current flows in the reverse direction through the sodium-ion battery pack 1. Since the electrochemical reaction of the sodium-ion battery pack 1 within the polarization range is highly reversible, this high-frequency alternating current pulse will not induce sodium deposition side reactions, but will purely utilize the internal ohmic resistance and polarization resistance of the battery to generate Joule heat, achieving uniform heating of the sodium-ion battery pack 1 from the inside out.

[0031] In this embodiment, as Figure 1 and Figure 2 As shown, the filter unit 3 adopts an LC series resonant circuit. The filter unit 3 includes an inductor 301 and a capacitor 302 connected in series. One end of the inductor 301 is connected to the common terminal (i.e., the first bridge arm) of the first power switch 201 and the third power switch 203, and the other end is connected to the negative terminal of the sodium-ion battery pack 1 through the non-polar thin film capacitor 302. The common terminal of the second power switch 202 and the fourth power switch 204 is connected to the other terminal of the sodium-ion battery pack 1, thereby forming a complete circuit of the LC series resonant circuit.

[0032] In this embodiment, the LC series resonant circuit has two core functionalities in its hardware design: The first layer is resonant current limiting. The parameter values ​​of inductor 301 and capacitor 302 are matched according to the operating frequency of PWM, so that the operating frequency of PWM is in the inductive region or near the quasi-resonant point. The square wave voltage is converted into a smooth sinusoidal current waveform through inductive reactance, and the pulse peak current is strictly limited to the maximum allowable rate (such as 2C to 3C) of sodium-ion battery pack 1. The second layer is for DC blocking and shock protection. The series capacitor 302 acts as a DC blocking capacitor, ensuring that in extreme cases (such as the failure of a single MOSFET), DC current cannot continuously flow through the sodium-ion battery pack 1, thus completely blocking the possibility of DC short circuit from the physical link.

[0033] In this embodiment, as Figure 3 As shown, the hardware interlock unit 4 includes a NAND gate logic circuit 401 and an isolated driver chip 402; the input terminal of the NAND gate logic circuit 401 receives the heating enable command and the contactor 7 status signal respectively, and the output terminal is connected to the input terminal of the driver chip 402.

[0034] In this embodiment, as Figure 2As shown, the driver chip 402 is connected to the gates of the first power switch 201, the second power switch 202, the third power switch 203, and the fourth power switch 204, respectively, and is used to control the first power switch 201, the second power switch 202, the third power switch 203, and the fourth power switch 204 to be turned on or off. On the one hand, the driver chip 402 performs level conversion and power amplification, amplifying the weak logic signal output from the NAND gate logic circuit 401 into voltage and current signals sufficient to drive the first power switch 201 and the fourth power switch 204 to be turned on or off quickly. On the other hand, as a hardware-level safety control terminal, when the input signal does not meet safety conditions, the driver chip 402 is used to disconnect the contactor 7, thereby physically blocking the closure of the main charging and discharging circuit 6.

[0035] In this embodiment, inductor 301 is connected between the first power switch 201 and the driver chip 402.

[0036] In this embodiment, the specific workflow of the hardware interlock unit 4 is as follows: The controller 5 sends a high-level heating enable command to the first input terminal of the NAND gate logic circuit 401; The battery management system (BMS) of the sodium-ion battery pack 1 is connected to the second input terminal of the NAND gate logic circuit 401 through the auxiliary contact (normally closed contact, usually written as NC contact) of the contactor 7 of the main charging and discharging circuit 6.

[0037] Decision logic: Only when the main discharge contactor 7 is confirmed to be in the open state (second input terminal is high level) and the controller 5 issues a heating command (first input terminal is high level), will the NAND gate logic circuit 401 output a valid signal, transmitting the heating enable command to the subsequent driver chip 402. Upon receiving the valid signal, the driver chip 402 starts working, amplifying and level-shifting the input pulse width modulation (PWM) drive signal to generate multiple drive signals that meet the turn-on level requirements of the silicon carbide (SiC) MOSFET. Specifically, the driver chip 402 integrates a level shifting circuit and a complementary push-pull output architecture. It achieves level shifting by converting the input low-voltage PWM signal into an alternating voltage signal with positive and negative dual power supply biases, and expands the output current using the low on-resistance characteristics of the internal output stage, thereby achieving power amplification.

[0038] The specific physical process by which the driver chip 402 controls the first power switch 201, the second power switch 202, the third power switch 203, and the fourth power switch 204 to turn on or off is as follows: In response to the input PWM drive signal, the driver chip 402 dynamically injects or extracts ampere-level transient currents into or from the gates of the corresponding first power switch 201, second power switch 202, third power switch 203, and fourth power switch 204 at its multiple drive output terminals, in order to overcome the parasitic junction capacitance at their gates and satisfy the high d... i / d t The transient charging current demand rapidly pushes the gate-source voltage of the transistor to a preset on-threshold level or pulls it down to an off-threshold level, thereby forcibly controlling the first power switch 201, the second power switch 202, the third power switch 203, and the fourth power switch 204 to precisely alternately turn on and off at a high frequency of 1kHz to 10kHz, ultimately driving the alternating current to safely pass through the sodium-ion battery pack 1. Once the contactor 7 malfunctions or is in a closed state (i.e., the main charging / discharging circuit 6 is discharging or charging externally), the second input terminal becomes low, and the hardware logic gate instantly pulls down the enable pin of the driver chip 402, forcibly locking the output of the PWM drive signal.

[0039] In this embodiment, the locking mechanism of the hardware interlock unit 4 ensures that the AC pulse generation unit 2 will not start when the sodium-ion battery pack 1 is under load (working) regardless of whether the software logic of the controller 5 runs out of control, crashes, or enters an infinite loop. This avoids damage to electrical equipment or high-voltage arcing caused by the mutual interference between the high-frequency alternating current pulse and the DC load.

[0040] In some embodiments, the NAND gate logic circuit 401 in the hardware interlock unit 4 can also be replaced by a hardware equivalent logic determination circuit composed of other basic logic gate circuits such as AND gate, NOR gate or XOR gate.

[0041] In other embodiments, the hardware interlock unit 4 may also be a hardware logic interlock circuit built with discrete transistors (such as bipolar transistors or MOSFETs). By using two control signals to directly control the bias state of the transistors, the hardware-level lock-up function can be achieved without relying on digital logic chips. The driver chip 402 can only be turned on when both input signals meet the safety conditions at the same time, and the input terminal of the driver chip 402 is forcibly pulled low in any other state.

[0042] In other embodiments, besides the LC series resonant circuit, the filter unit 3 can also employ a π-type CLC low-pass filter circuit or an LCL resonant topology network. When using an LCL resonant topology network, the decoupling characteristics of the dual inductor elements can be utilized to further suppress high-frequency switching shear. i / d tThe surge voltage impact on the sodium-ion battery pack 1 is reduced. This makes the waveform of the alternating current injected into the sodium-ion battery pack 1 closer to a pure sine wave, thereby further reducing the potential damage of high-frequency harmonics to the electrochemical interface inside the sodium-ion battery.

[0043] Example 2 This embodiment provides a battery pack based on Embodiment 1.

[0044] In this embodiment, the battery pack integrates the sodium-ion battery AC pulse internal heating control module adapted to multiple temperature conditions, as described in Embodiment 1.

[0045] Example 3 This embodiment provides a vehicle based on the above embodiments.

[0046] The vehicle in this embodiment includes a battery pack as in Embodiment 2, and the battery pack can be used as a power source for the vehicle.

[0047] Example 4 This embodiment provides an energy storage system based on the above embodiments.

[0048] In this embodiment, the energy storage system includes a battery pack as shown in Embodiment 2.

[0049] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A sodium-ion battery AC pulse internal heating control module adapted to multiple temperature conditions, characterized in that, include: An AC pulse generating unit (2) is electrically connected at both ends to the positive and negative terminals of a sodium-ion battery pack (1) to generate an alternating current passing through the sodium-ion battery pack (1). One end of the sodium-ion battery pack (1) is connected to a main charging and discharging circuit (6), which is connected in parallel with the AC pulse generating unit (2). The filter unit (3) is connected in series in the circuit between the AC pulse generation unit (2) and the sodium-ion battery pack (1) to smooth the alternating current; The hardware interlock unit (4) is electrically connected to the contactor (7) of the AC pulse generating unit (2) and the main charging and discharging circuit (6) respectively. When a heating command is received, the hardware logic circuit blocks the closing action of the contactor (7) to physically block the closing of the main charging and discharging circuit (6) and prevent the main charging and discharging circuit (6) from conflicting and short-circuiting with the alternating current circuit of the AC pulse generating unit (2).

2. The sodium-ion battery AC pulse internal heating control module according to claim 1, characterized in that, The AC pulse generation unit (2) adopts an H-bridge topology. The AC pulse generation unit (2) includes a first power switch (201), a second power switch (202), a third power switch (203), and a fourth power switch (204). The first power switch (201) and the third power switch (203) form the first arm of the H-bridge topology, and the second power switch (202) and the fourth power switch (204) form the second arm of the H-bridge topology.

3. The sodium-ion battery AC pulse internal heating control module according to claim 2, characterized in that, The filter unit (3) adopts an LC series resonant circuit. The filter unit (3) includes an inductor (301) and a capacitor (302) connected in series. One end of the inductor (301) is connected to the common terminal of the first power switch (201) and the third power switch (203). The other end of the inductor (301) is connected to one end of the capacitor (302). The other end of the capacitor (302) is connected to one pole of the sodium-ion battery pack (1). The common terminal of the second power switch (202) and the fourth power switch (204) is connected to the other pole of the sodium-ion battery pack (1).

4. The sodium-ion battery AC pulse internal heating control module according to claim 1, characterized in that, The hardware interlock unit (4) includes a NAND gate logic circuit (401) and a driver chip (402). The input terminal of the NAND gate logic circuit (401) receives a heating enable command and a contactor (7) status signal, respectively. The output terminal is connected to the input terminal of the driver chip (402). The driver chip (402) is used to disconnect the contactor (7) when the input signal does not meet the safety conditions, thereby physically blocking the closure of the main charging and discharging circuit (6).

5. The sodium-ion battery AC pulse internal heating control module according to claim 2, characterized in that, The first power switch (201), the second power switch (202), the third power switch (203) and the fourth power switch (204) are all silicon carbide MOSFETs.

6. The sodium-ion battery AC pulse internal heating control module according to claim 1, characterized in that, It also includes a controller (5), which is electrically connected to the AC pulse generation unit (2) via a pulse width modulation signal line.

7. The sodium-ion battery AC pulse internal heating control module according to claim 1, characterized in that, The AC pulse generation unit (2) and the filtering unit (3) are integrated on the same metal-based printed circuit board.

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