Vehicle peak power energy storage system based on diode isolation and sodium electric compensation

Abstract

The utility model relates to vehicle peak power energy storage technical field, and disclose vehicle peak power energy storage system based on diode isolation and sodium electricity compensation, include: sodium battery, DC-DC converter, monitoring unit, DC bus, D1 diode and D2 diode, sodium battery links with DC-DC converter, DC-DC converter connects monitoring unit, DC-DC converter and sodium battery all are connected with DC bus, D1 diode is located between sodium battery and DC bus, D2 diode is located between DC-DC converter and DC bus, monitoring unit can perceive vehicle power demand change, cooperates DC-DC converter control, makes sodium battery timely access circuit to supplement lithium battery power output gap, satisfies the peak power demand under the vehicle specific scene, diode can realize sodium battery branch and the effective isolation of relevant circuit, guarantees system operation safety, the mixed passage design formed by diode and DC-DC converter realizes the technical effect of no loop current safety.

Description

Technical Field

[0001] This utility model relates to the field of vehicle peak power energy storage technology, specifically a vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation. Background Technology

[0002] Vehicle energy storage systems specifically refer to hybrid energy storage systems that address peak power demands during vehicle operation. These systems are applied to onboard power systems that require a balance between energy supply stability and peak power output capability.

[0003] In pursuit of high energy density, vehicle-mounted lithium-ion batteries often struggle to provide sustained and extremely high discharge rates. During rapid acceleration, overtaking, and steep inclines, the battery management system limits power output to protect the battery, leading to sluggish acceleration or power limiting, impacting driving experience and safety. Prolonged operation of lithium-ion batteries near peak power accelerates aging, causing rapid degradation in capacity and internal resistance. Using only high-rate lithium-ion batteries to meet peak power requirements drastically increases system costs and imposes extremely stringent thermal management requirements. Therefore, this paper proposes a vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation, in order to solve the technical problems of weak acceleration or power limitation in vehicles, which affect driving experience and safety.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation, comprising:

[0006] A sodium battery, and a DC-DC converter connected to the sodium battery, wherein the DC-DC converter is connected to a monitoring unit, the DC-DC converter and the sodium battery are connected to a DC bus, and a D2 diode is added between the DC-DC converter and the DC bus, and a D1 diode is added between the corresponding sodium battery and the DC bus.

[0007] Normal cruise mode

[0008] When the vehicle's power demand is low, the monitoring unit monitors the power status, the lithium battery current flows to the DC bus, the D1 diode is forward biased and conducts, the DC-DC converter remains off, and the sodium battery remains disconnected from the DC bus through the DC-DC converter.

[0009] Peak demand pattern

[0010] When the vehicle's power demand is high, the monitoring unit detects the power demand signal and starts the DC-DC converter. The DC-DC converter draws power from the sodium battery and performs a boost process. The D2 diode is forward biased and conducts. The sodium battery current is injected into the DC bus through the DC-DC converter, and together with the current output from the lithium battery, it powers the drive motor.

[0011] Preferably, a wire connects the sodium battery and the DC-DC converter, and the wire is laid along the side wall of the sodium battery, with a clamp added between the wire and the sodium battery. The clamp secures the wire, preventing it from shifting or moving during vehicle operation, ensuring stable power transmission between the sodium battery and the DC-DC converter, and reducing the risk of connection failure.

[0012] Preferably, the monitoring unit is connected to the control terminal of the DC-DC converter, and the installation position of the monitoring unit is offset from the heat dissipation vents on the DC-DC converter. This avoids the monitoring unit blocking the heat dissipation vents, ensuring the heat dissipation efficiency of the DC-DC converter, while also ensuring that the monitoring unit is not directly affected by the heat dissipation airflow, maintaining the stability of signal monitoring and transmission.

[0013] Preferably, the D1 diode is connected in series in the main circuit between the sodium battery and the DC bus, and both ends of the D1 diode are connected to the sodium battery and the DC bus respectively with bolt-type terminals. The bolt-type terminals enhance the reliability of the electrical connection between the D1 diode and the sodium battery and the DC bus, and together with the unidirectional conduction function of the D1 diode, further ensure the system's non-circulating current safety and improve the stability of power transmission.

[0014] Preferably, diode D2 is connected in series in the main circuit between the DC-DC converter and the DC bus, and the mounting direction of diode D2 is consistent with that of diode D1. This unified mounting direction ensures that diodes D1 and D2 form a cooperative unidirectional conduction mechanism, effectively blocking the circulating current path, ensuring the safe coordinated power supply of the sodium battery and lithium battery under peak power mode, and improving system operational stability.

[0015] Preferably, a dust cover is fitted around the outside of the bolt-type terminal block, and the dust cover forms a tight seal with both the sodium battery and the DC bus. This tight seal design prevents dust from entering the wiring area, avoids oxidation or poor contact of the terminal block, extends the service life of the wiring structure, and ensures the long-term reliability of the electrical connection between the D1 diode and related components.

[0016] Preferably, the D2 diode is provided with a heat sink on its exterior, and the heat sink is closely attached to the D2 diode and extends in the horizontal direction. Increasing the heat dissipation area improves the heat dissipation efficiency of the D2 diode, avoids performance degradation or damage due to overheating in peak power mode, ensures continuous and stable operation of the D2 diode, and extends its service life.

[0017] Preferably, the monitoring unit is connected to a signal transmission line, and the signal transmission line of the monitoring unit is laid in parallel with the wires between the sodium battery and the DC-DC converter. Cable ties are added between the signal transmission line and the wires. The parallel layout and cable tie fixation reduce entanglement interference between the signal transmission line and the wires, ensuring the accuracy of signal transmission and the stability of power transmission, while optimizing the neatness of the wiring and facilitating later maintenance.

[0018] Compared with the prior art, this utility model provides a vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation, which has the following advantages:

[0019] This vehicle peak power energy storage system based on diode isolation and sodium battery compensation has a DC-DC converter connected to a monitoring unit. The monitoring unit can sense changes in the vehicle's power demand in a timely manner. With the regulation function of the DC-DC converter, the sodium battery can be connected to the circuit and output power at the appropriate time, effectively supplementing the power output gap of the lithium battery and meeting the vehicle's peak power demand in specific scenarios.

[0020] By placing a D1 diode between the sodium battery and the DC bus and a D2 diode between the DC-DC converter and the DC bus, effective isolation between the sodium battery branch and related circuits can be achieved, avoiding circulating current during system operation and ensuring the safety of the entire energy storage system. At the same time, the hybrid channel design formed by the D1 diode, D2 diode and the DC-DC converter achieves technical effects such as non-circulating current safety, low cost, peak power improvement and extended lithium battery life. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0022] Figure 2 This is a schematic diagram of the usage process of this utility model. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] This utility model provides a technical solution for a vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation, including: (See details) Figure 1 and Figure 2The device includes a sodium battery and a DC-DC converter connected to the sodium battery, wherein the DC-DC converter is connected to a monitoring unit, the DC-DC converter and the sodium battery are connected to a DC bus, and a D2 diode is added between the DC-DC converter and the DC bus, and a D1 diode is added between the corresponding sodium battery and the DC bus.

[0025] By leveraging the synergistic effect of diodes D1 and D2 with the DC-DC converter, physical isolation between the sodium battery branch and the lithium battery branch is achieved, preventing the generation of circulating current between branches and ensuring the safe operation of the system.

[0026] Without relying on high-rate lithium batteries to meet peak power requirements, the intelligent compensation design of sodium batteries significantly reduces the overall system cost and alleviates the design pressure on the thermal management system.

[0027] In peak power scenarios, the sodium battery is quickly replenished with power by the DC-DC converter, effectively making up for the power output gap of the lithium battery, avoiding vehicle acceleration fatigue, and improving driving experience and driving safety.

[0028] Lithium batteries only operate under normal power requirements and do not need to operate at peak power for a long time, which slows down capacity degradation and internal resistance increase, and extends the life of lithium batteries.

[0029] During normal cruise, the DC-DC converter is turned off and the sodium battery branch is completely disconnected, resulting in no additional standby energy consumption and achieving efficient and energy-saving operation of the system.

[0030] A wire connects the sodium battery to the DC-DC converter, and the wire runs along the side wall of the sodium battery. A clamp is installed between the wire and the sodium battery. The wire allows electrical energy from the sodium battery to be transferred to the DC-DC converter, and the clamp secures the wire to the side wall of the sodium battery.

[0031] The monitoring unit is connected to the control terminal of the DC-DC converter, and its installation position is offset from the heat dissipation vents on the DC-DC converter. The monitoring unit transmits the vehicle power signal to the control terminal of the DC-DC converter, and its installation position avoids the heat dissipation vents of the DC-DC converter.

[0032] Diode D1 is connected in series in the main circuit between the sodium battery and the DC bus, and its two ends are connected to the sodium battery and the DC bus respectively via bolt-on terminals. These bolt-on terminals electrically connect Diode D1 to both the sodium battery and the DC bus, allowing Diode D1 to unidirectionally conduct or cut off the current in the main circuit.

[0033] Diode D2 is connected in series in the main circuit between the DC-DC converter and the DC bus, and its mounting orientation is the same as that of diode D1. Diode D2 enables unidirectional current conduction in the main circuit between the DC-DC converter and the DC bus, and its mounting orientation ensures that the current conduction direction is consistent with that of diode D1.

[0034] The bolt-type terminal block is fitted with a dust cover, which forms a tight seal with both the sodium battery and the DC bus. The dust cover ensures a tight seal between the bolt-type terminal block and the sodium battery and DC bus, thus isolating the bolt-type terminal block from external dust.

[0035] The D2 diode has an external heat sink that is tightly fitted to the diode and extends horizontally. The heat sink dissipates the heat generated by the D2 diode during operation, and its horizontal extension expands the heat dissipation range.

[0036] The monitoring unit is connected to a signal transmission line, which runs parallel to the wires connecting the sodium battery and the DC-DC converter. Cable ties connect the signal transmission line to the wires. The signal transmission line transmits the power monitoring signal from the monitoring unit, and the cable ties keep the signal transmission line parallel and fixed to the wires connecting the sodium battery and the DC-DC converter.

[0037] This solution: The monitoring unit monitors the vehicle's power status; the signal transmission line transmits the power monitoring signal from the monitoring unit; cable ties keep the signal transmission line parallel and fixed to the wires between the sodium battery and the DC-DC converter; the lithium battery current flows to the DC bus; the bolt-type terminal connects the D1 diode to the sodium battery and the DC bus; the D1 diode enables unidirectional conduction of current in the main circuit; the dust cover forms a tight seal between the bolt-type terminal and the sodium battery and the DC bus; and the dust cover isolates the bolt-type terminal from external dust.

[0038] The DC-DC converter remains off, the wires disconnect the power transmission path of the sodium battery, and the clamps fix the wires to the side wall of the sodium battery. The sodium battery remains disconnected from the DC bus through the DC-DC converter.

[0039] The monitoring unit detects the vehicle power demand signal and transmits the vehicle power signal to the control terminal of the DC-DC converter. The DC-DC converter starts up, and the wires transmit the electrical energy from the sodium battery to the DC-DC converter. The clamps fix the wires to the side wall of the sodium battery. The DC-DC converter draws power from the sodium battery and performs voltage boosting.

[0040] The D2 diode enables unidirectional current conduction in the main circuit between the DC-DC converter and the DC bus. The heat sink dissipates the heat generated by the D2 diode during operation. The sodium battery current is injected into the DC bus through the DC-DC converter. The lithium battery ensures a continuous current flow to the DC bus, which, together with the current output from the sodium battery, powers the drive motor.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation, characterized in that, include: A sodium battery, and a DC-DC converter connected to the sodium battery, wherein the DC-DC converter is connected to a monitoring unit, the DC-DC converter and the sodium battery are connected to a DC bus, and a D2 diode is added between the DC-DC converter and the DC bus, and a D1 diode is added between the corresponding sodium battery and the DC bus.

2. The vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation according to claim 1, characterized in that: A wire is connected between the sodium battery and the DC-DC converter, and the wire is laid along the side wall of the sodium battery, with a clamp added between the wire and the sodium battery.

3. The vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation according to claim 1, characterized in that: The monitoring unit is connected to the control terminal of the DC-DC converter, and the installation position of the monitoring unit is offset from the heat dissipation vent on the DC-DC converter.

4. The vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation according to claim 1, characterized in that: The D1 diode is connected in series in the main circuit between the sodium battery and the DC bus, and both ends of the D1 diode are connected to the sodium battery and the DC bus respectively with bolt-type terminals.

5. The vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation according to claim 1, characterized in that: The D2 diode is connected in series in the main circuit between the DC-DC converter and the DC bus, and the mounting direction of the D2 diode is the same as that of the D1 diode.

6. The vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation according to claim 4, characterized in that: The bolt-type terminal block is fitted with a dust cover, and the dust cover forms a tight seal with the sodium battery and the DC bus.

7. The vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation according to claim 1, characterized in that: The D2 diode is provided with a heat sink on its exterior, and the heat sink is closely attached to the D2 diode and extends in the horizontal direction.

8. The vehicle peak power energy storage system based on diode isolation and sodium-ion battery compensation according to claim 2, characterized in that: The monitoring unit is connected to a signal transmission line, and the signal transmission line of the monitoring unit is laid in parallel with the wire between the sodium battery and the DC-DC converter. A cable tie is added between the signal transmission line and the wire.

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