A zero-voltage charging device for sodium-ion battery

Abstract

The utility model discloses a zero voltage of a kind of sodium ion battery is started to charge device belongs to battery charging technical field.The device includes charging pile, battery and charging handle, and charging pile is equipped with reset button and control panel, and battery is built-in BMS and battery cell, and charging handle connects charging pile and battery.Control panel is communicated with BMS by CAN bus, and the monitoring and charging control of battery state are realized.The utility model can safely and reliably activate sodium ion battery in power shortage or power feeding state without disassembling battery pack, so that it recovers normal charging function, the device is easy to operate, and battery activation can be completed by pressing reset button only, especially suitable for sodium ion battery maintenance of electric bicycle and other equipment.

Description

Technical Field

[0001] This utility model belongs to the field of battery charging technology, specifically relating to a zero-voltage charging device for sodium-ion batteries. Background Technology

[0002] Currently, after prolonged periods of inactivity, electric bicycle batteries often experience problems with proper discharge. Specifically, although the battery retains some charge, the over-discharge protection mechanism of the Battery Management System (BMS) forcibly disconnects the discharge circuit, preventing the battery from discharging or being activated by a conventional charger. This phenomenon is particularly pronounced in electric bicycles using sodium-ion batteries. Although sodium-ion batteries have a relatively wide range of cell voltage limits, traditional charging methods are ineffective in handling situations where the battery is depleted or unable to discharge its charge.

[0003] In existing technologies, a common approach is to add high and low voltage detection loops to the charger circuit to determine whether the battery is in a discharged state, and then attempt to activate charging. However, this method not only increases circuit complexity but may also lead to misjudgment or activation failure. In addition, some solutions require disassembling the battery pack to manually reset the BMS, but disassembly operations pose safety hazards such as short circuits and leakage, which are high risks for non-professionals.

[0004] Therefore, there is an urgent need for a solution that is easy to operate and safe and reliable, without disassembling the battery pack, to solve the charging problem of sodium-ion batteries when they are depleted or unable to release their charge. Summary of the Invention

[0005] The purpose of this invention is to provide a zero-voltage charging device for sodium-ion batteries. This device, through the setting of a charging handle and a reset button, can safely and reliably activate sodium-ion batteries in a depleted or discharged state without disassembling the battery pack, and restore them to normal charging function.

[0006] To solve the aforementioned technical problems, this utility model adopts the following technical solution: a zero-voltage charging device for sodium-ion batteries, comprising a charging pile and a battery, with a charging handle connected between the charging pile and the battery. The battery has a built-in BMS and battery cells, and the charging pile is equipped with a reset button for triggering the BMS. This utility model solves the problem of traditional charging methods being unable to activate depleted or discharged batteries through the coordinated work of the charging pile, battery, and charging handle. Specifically, the charging handle connects the charging pile and the battery, greatly improving safety and convenience. The battery has a built-in BMS and battery cells; the BMS monitors the battery status and controls the switching of MOSFETs, while the reset button on the charging pile triggers the BMS, putting the battery into a rechargeable state. Compared to existing technologies, this design avoids the drawbacks of requiring manual BMS reset or complex detection circuitry in traditional methods.

[0007] The charging pile includes a control board, which communicates with the BMS via a CAN bus. CAN bus is a communication protocol widely used in automotive electronics and industrial control, offering advantages such as strong anti-interference capabilities, long transmission distances, and support for multi-device communication.

[0008] The reset button can be a key, touch switch, or relay contact. After the reset button is triggered, the control board sends a MOSFET turn-on command to the BMS via the CAN bus. Traditionally, to detect whether the battery is depleted, a high- and low-voltage circuit needs to be added to the charger circuit for detection before charging. This invention adds a reset button to the charging station, which is connected to the battery via a charging handle. When the reset button is pressed, the control board sends a MOSFET turn-on command to the BMS via the CAN bus, ensuring that the battery charging circuit is correctly activated.

[0009] The charging handle includes a handle grip and a connector.

[0010] The connector includes a positive charging interface and a negative charging interface. The connector also includes at least two auxiliary contacts for data interaction with the battery management system (BMS). Preferably, it employs two main charging contacts and four auxiliary contacts, enabling real-time reading of battery parameters, detection of whether the battery is in a discharged or depleted state, and sending charging or discharging control commands.

[0011] The control board of the charging pile interacts with the BMS via a communication bus (CAN, 485, or one-wire communication), and can maintain communication even when the battery voltage is 0V.

[0012] This invention relates to a sodium-ion battery zero-voltage charging device that supports multiple communication methods, including CAN bus, RS485 bus, and one-wire communication. The design of these communication protocols ensures that the Battery Management System (BMS) can still function normally even in extreme cases where the battery voltage is 0V. Specifically, the charging pile's control board interacts with the battery's BMS through the aforementioned communication methods, monitoring the battery status and sending control commands. When the battery is in a low-charge or depleted state, the user only needs to press the reset button, and the control board will continuously send MOSFET turn-on commands to the BMS via RS485 (or one-wire or CAN bus). If the MOSFET does not turn on after three attempts, it will be forcibly turned on. This multi-protocol compatible design significantly improves the device's reliability and applicability, solves the communication interruption problem caused by excessively low battery voltage in traditional methods, and avoids the risks of disassembling the battery pack. It is simple to operate and safe and efficient.

[0013] Specifically, when the battery is detected to be in a depleted state, the BMS is first powered on and the charging MOSFET is turned on, and then the battery is charged with a small current. That is: first, the BMS is powered on, turning on the charging MOSFET, and then the battery is charged with a small current. Once the normal voltage is reached, normal charging begins. When the battery is detected to be in a discharged state, the charging and discharging MOSFETs are triggered to turn on synchronously via the reset button. The reset button on the charging pile is used to trigger the charging and discharging MOSFET synchronous turn-on command of the BMS protection board. If the charging pile detects that the sodium-ion battery shows a SOC (State of Charge) state but cannot discharge normally or activate charging, then the battery is in a discharged state. When the battery is connected to the charging pile and the reset button is pressed, the control board sends three consecutive MOSFET turn-on commands to the BMS via the CAN bus, and then actively requests status register data. After the control board parses the MOSFET status code fed back by the BMS, it triggers the voice module to announce "Reset successful" or "Reset failed".

[0014] The charging pile is equipped with a voice module, which is used to broadcast the status code feedback result based on the status code fed back by the BMS.

[0015] The charging station is equipped with a status indicator light to display the charging status of the battery.

[0016] The beneficial effects of this invention are as follows: Through the coordinated operation of the charging station, battery, and charging handle, batteries in a depleted or discharged state can be safely and conveniently activated. The charging handle is compatible with sodium-ion battery interfaces of different specifications, expanding the applicability of the device. Users only need to connect the charging handle and press the reset button; the system can automatically identify the battery status and execute the corresponding charging strategy without disassembling the battery pack, achieving plug-and-play functionality. The charging handle integrates detection and communication functions; connecting the fast-charging station and battery can complete detection, activation, and restoration of charging function within 5 seconds, significantly improving maintenance efficiency and battery reliability. The charging station is equipped with voice prompts and status indicator lights, making the operation process simple and intuitive. This invention can reduce the maintenance cost of sodium-ion batteries, reduce the probability of battery depletion leading to unusable conditions, and the design of the reset button and charging handle ensures both operational safety and improved ease of use, making it suitable for battery maintenance in devices such as electric bicycles. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the charging handle described in Embodiment 1.

[0019] Figure 2 This is a schematic diagram of the connector for the charging handle described in Embodiment 1.

[0020] Explanation of reference numerals in the attached diagram: 1-Handle grip; 2-Connector; 21-Positive charging interface; 22-Negative charging interface; 23-Auxiliary contact. Detailed Implementation

[0021] 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.

[0022] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Example 1

[0024] like Figure 1 and Figure 2 As shown, a zero-voltage charging device for sodium-ion batteries includes a charging station and a battery. A charging handle connects the charging station and the battery. The battery incorporates a battery management system (BMS) and battery cells. The charging station has a reset button to trigger the BMS. This invention solves the problem of traditional charging methods failing to activate depleted or discharged batteries through the coordinated operation of the charging station, battery, and charging handle. Specifically, the charging handle connects the charging station and battery, greatly improving safety and convenience. The battery incorporates a BMS and battery cells. The BMS monitors the battery status and controls the switching of MOSFETs, while the reset button on the charging station triggers the BMS, putting the battery into a rechargeable state. Compared to existing technologies, this design avoids the drawbacks of manually resetting the BMS or adding complex detection circuits in traditional methods.

[0025] The charging pile includes a control board, which communicates with the BMS via a CAN bus. CAN bus is a communication protocol widely used in automotive electronics and industrial control, offering advantages such as strong anti-interference capabilities, long transmission distances, and support for multi-device communication.

[0026] The reset button can be a key, touch switch, or relay contact. After the reset button is triggered, the control board sends a MOSFET turn-on command to the BMS via the CAN bus. Traditionally, to detect whether the battery is depleted, a high- and low-voltage circuit needs to be added to the charger circuit for detection before charging. This invention adds a reset button to the charging station, which is connected to the battery via a charging handle. When the reset button is pressed, the control board sends a MOSFET turn-on command to the BMS via the CAN bus, ensuring that the battery charging circuit is correctly activated.

[0027] The charging handle includes a handle grip 1 and a connector 2. The connector 2 includes a positive charging interface 21 and a negative charging interface 22, and also includes four auxiliary contacts 23, supporting 485 bus and / or CAN bus and / or one-wire communication. At least one pair of differential signal lines is included in each of the auxiliary contacts 23 for 485 bus communication.

[0028] When the battery is detected to be in a depleted state, the BMS is first powered on and the charging MOSFET is turned on, and then the battery is charged with a small current. That is: first, the BMS is powered on, turning on the charging MOSFET of the BMS, and then the battery is charged with a small current. Once the normal voltage is reached, normal charging is switched on.

[0029] When the battery is detected to be in a depleted state, the reset button triggers the synchronous conduction of the charging and discharging MOSFETs. The reset button on the charging pile is used to trigger the synchronous turn-on command of the charging and discharging MOSFETs on the BMS protection board. If the charging pile detects that the sodium-ion battery shows a SOC (State of Charge) state but cannot discharge normally or activate charging, the battery is in a depleted state. When the battery is connected to the charging pile and the reset button is pressed, the control board sends three consecutive MOSFET turn-on commands to the BMS via the CAN bus, and then actively requests status register data. After parsing the MOSFET status code fed back by the BMS, the control board triggers the voice module to announce "Reset successful" or "Reset failed".

[0030] The charging pile is equipped with a voice module, which is used to broadcast the status code feedback result based on the status code fed back by the BMS.

[0031] The charging station is equipped with a status indicator light to display the charging status of the battery.

[0032] It should be noted that the terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the scope of this application. As shown in this specification, unless the context clearly indicates otherwise, words such as "a," "an," "an," and / or "the" do not specifically refer to the singular and may include the plural. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element.

[0033] It should also be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0034] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the present utility model, and are not intended to limit the implementation methods of the present utility model in any way. Any person skilled in the art can make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in the present utility model, but these should still be regarded as the same technology or embodiment as the present utility model.

[0035] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A zero-voltage charging device for sodium-ion batteries, comprising a charging pile and a battery, characterized in that, A charging handle connects the charging pile to the battery. The battery has a built-in BMS and battery cells. The charging pile is equipped with a reset button to trigger the BMS.

2. The zero-voltage charging device for a sodium-ion battery according to claim 1, characterized in that, The charging pile includes a control board, which communicates with the BMS via a CAN bus.

3. The zero-voltage charging device for a sodium-ion battery according to claim 2, characterized in that, The reset button is a key, a touch switch, or a relay contact. After the reset button is triggered, the control board sends a MOSFET turn-on command to the BMS via the CAN bus.

4. A zero-voltage charging device for a sodium-ion battery according to claim 1, characterized in that, The charging handle includes a handle grip (1) and a connector (2).

5. A zero-voltage charging device for a sodium-ion battery according to claim 4, characterized in that, The connector (2) includes a charging positive interface (21) and a charging negative interface (22), and the connector (2) supports 485 bus and / or CAN bus and / or one-wire communication.

6. A zero-voltage charging device for a sodium-ion battery according to claim 4, characterized in that, The connector (2) includes four auxiliary contacts (23) for data interaction with the battery BMS, and at least one pair of differential signal lines in the auxiliary contacts (23) are used for 485 bus communication.

7. A zero-voltage charging device for a sodium-ion battery according to claim 1, characterized in that, When the battery is detected to be in a depleted state, the BMS is first powered and the charging MOSFET is turned on, and then the battery is charged with a small current.

8. A zero-voltage charging device for a sodium-ion battery according to claim 1, characterized in that, When the battery is detected to be in a depleted state, the charging and discharging MOSFETs are triggered to turn on synchronously via the reset button.

9. A zero-voltage charging device for a sodium-ion battery according to claim 1, characterized in that, The charging pile is equipped with a voice module, which is used to broadcast the status code feedback result based on the status code fed back by the BMS.

10. A zero-voltage charging device for a sodium-ion battery according to claim 1, characterized in that, The charging station is equipped with a status indicator light to display the charging status of the battery.

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