Electric wheelchair lithium battery hibernation monitoring device
Patent Information
- Application Number
- CN202522490753.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-24
- Publication Date
- 2026-09-18
- Estimated Expiration
- 2035-11-24
AI Technical Summary
[0003]本实用新型为解决现有电动轮椅存在所使用的锂电池不具有锂电池是否进入休眠状态监测功能，不利于提高老年人群体在使用电动轮椅时的使用监测安全有效性，存在一定安全隐患问题等现状而提供的一种可以直观观察电池有无进入休眠状态，有利于老年人电池简单操作使用，提高电动轮椅使用安全性，也对维修人员易于电池故障排查的电动轮椅锂电池休眠监测装置
[0006] The beneficial effects of this invention are: it allows for direct monitoring and observation of whether the lithium battery used in electric wheelchairs has entered a dormant state, which is beneficial for the elderly to understand and easily operate the lithium battery in electric wheelchairs, improving the safety of electric wheelchair use, and also making it easier for maintenance personnel to troubleshoot battery faults. LED1 provides a continuous dormant monitoring and visualization effect. When the battery is in working condition, LED1 is always lit; when the battery is in dormant condition, LED1 is turned off, which can directly inform the end user of the battery status, thus preventing misjudgment of the battery status.
Smart Images
Figure CN224774663U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an electric wheelchair, and more particularly to an electric wheelchair lithium battery dormancy monitoring device used to monitor and determine the lithium battery in an electric wheelchair. Background Technology
[0002] With the continuous development and updating of electric wheelchair technology, electric wheelchairs have been widely accepted and used. However, the main beneficiaries of current electric wheelchairs are the elderly, especially those with limited mobility. The elderly often have slightly slower cognitive and responsiveness to things compared to younger people. The lithium batteries used in current electric wheelchairs do not have a function to monitor whether the lithium battery has entered a dormant state. This is not conducive to improving the safety and effectiveness of monitoring when the elderly use electric wheelchairs, posing certain safety hazards and making it difficult for the elderly to predict their condition when using electric wheelchairs. Utility Model Content
[0003] This invention addresses the shortcomings of existing electric wheelchairs, such as the lack of monitoring functionality to detect whether the lithium batteries have entered a dormant state. This lack of monitoring hinders safety and effectiveness for elderly users, posing potential safety hazards. The invention provides a lithium battery dormant state monitoring device for electric wheelchairs, allowing for direct observation of whether the battery has entered a dormant state. This facilitates easy battery operation for the elderly, improves the safety of electric wheelchairs, and makes battery troubleshooting easier for maintenance personnel. The specific technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: an electric wheelchair lithium battery dormancy monitoring device, comprising a series-parallel battery pack of lithium battery cells, characterized in that it further includes a protection board, a discharge MOS transistor assembly, and an indicator light switch assembly. The positive terminal of the lithium battery discharge port is electrically connected to the positive terminal of the series-parallel battery pack of lithium battery cells. The negative terminal of the series-parallel battery pack of lithium battery cells is connected in series with the discharge MOS transistor assembly and then electrically connected to the negative terminal of the lithium battery discharge port. An indicator light switch assembly is connected in parallel between the positive and negative terminals of the lithium battery discharge port. The indicator light switch assembly is electrically connected to the protection board. The protection board is used to provide automatic dormancy control detection for the series-parallel battery pack of lithium battery cells. The indicator light switch assembly is used for continuous dormancy monitoring visualization of the automatic dormancy control detection. When the battery is in working condition, the indicator light is always on. When the battery is in dormancy, the indicator light is off. This allows for intuitive monitoring and observation of whether the lithium battery used in the electric wheelchair has entered a dormancy state, which is beneficial for the elderly to understand and operate the electric wheelchair lithium battery, improves the safety of electric wheelchair use, and also facilitates battery fault diagnosis for maintenance personnel.
[0004] Preferably, the discharge MOS transistor assembly includes a first switching diode and a second switch connected in parallel, with the cathode of the first switching diode electrically connected to the negative terminal of the lithium battery discharge port. This improves the simplicity, reliability, and effectiveness of the discharge process.
[0005] Preferably, the indicator light switch assembly includes a first normally open switch, a first resistor, and a first LED indicator light. One end of the first normally open switch is electrically connected to the positive terminal of the lithium battery discharge port, the other end of the first normally open switch is electrically connected to the first resistor, the other end of the first resistor is electrically connected to the positive terminal of the first LED indicator light, and the negative terminal of the first LED indicator light is electrically connected to the negative terminal of the lithium battery discharge port; the other end of the first normally open switch is electrically connected to a protection board. This improves the convenience and intuitiveness for the elderly to directly monitor and observe whether the lithium battery used in the electric wheelchair has entered a dormant state.
[0006] The beneficial effects of this invention are: it allows for direct monitoring and observation of whether the lithium battery used in electric wheelchairs has entered a dormant state, which is beneficial for the elderly to understand and easily operate the lithium battery in electric wheelchairs, improving the safety of electric wheelchair use, and also making it easier for maintenance personnel to troubleshoot battery faults. LED1 provides a continuous dormant monitoring and visualization effect. When the battery is in working condition, LED1 is always lit; when the battery is in dormant condition, LED1 is turned off, which can directly inform the end user of the battery status, thus preventing misjudgment of the battery status. Attached Figure Description
[0007] Figure 1 This is a schematic diagram of the structure of the electric wheelchair lithium battery dormancy monitoring device of this utility model.
[0008] Figure 2 This is a schematic diagram of the protection board sleep control process of the electric wheelchair lithium battery sleep monitoring device of this utility model. Detailed Implementation
[0009] Figure 1 and Figure 2In the illustrated embodiment, an electric wheelchair lithium battery sleep monitoring device includes a series-parallel connected lithium battery cell battery pack U2, a protection board U1, a discharge MOSFET assembly, and an indicator light switch assembly U3. The positive terminal P+ of the lithium battery discharge port is electrically connected to the positive terminal of the series-parallel connected lithium battery cell battery pack U2. The negative terminal P- of the series-parallel connected lithium battery cell battery pack is connected to the negative terminal P- of the lithium battery discharge port after being connected in series with the discharge MOSFET assembly. An indicator light switch assembly is connected in parallel between the positive terminal and the negative terminal P- of the lithium battery discharge port. The indicator light switch assembly is electrically connected to the protection board. The protection board is used to control the negative terminal of the series-parallel connected lithium battery cell battery pack and has automatic sleep control. The indicator light switch assembly is used for continuous sleep monitoring visualization of the automatic sleep control. When the battery is in working state: LED1 is always lit; when the battery is in sleep state: LED1 is in sleep state and off. This can intuitively inform the end user of the battery status, so as not to misjudge the battery status. Figure 1 The positive terminal P+ of the lithium battery discharge port of the electric wheelchair shown is connected to the load wheelchair on the right side.
[0010] The discharge MOSFET assembly includes a first switching diode D1 and a second switch K2 connected in parallel. The cathode of the first switching diode is electrically connected to the negative terminal of the lithium battery discharge port. K2 is a simplified diagram of the MOSFET (this MOSFET operates in a linear state, equivalent to a low-impedance switch), and D1 is the parasitic diode of the discharge MOSFET.
[0011] The indicator light switch assembly includes a first normally open switch K1, a first resistor R1, and a first LED indicator LED1. One end of the first normally open switch K1 is electrically connected to the positive terminal P+ of the lithium battery discharge port, and the other end of the first normally open switch K1 is electrically connected to the first resistor R1. The other end of the first resistor R1 is electrically connected to the positive terminal of the first LED indicator LED1, and the negative terminal of the first LED indicator LED1 is electrically connected to the negative terminal P- of the lithium battery discharge port. The other end of the first normally open switch K1 is electrically connected to the protection board. After the battery enters sleep mode, an activation signal from the first normally open switch K1 can be sent to the MCU of the protection board through this electrical connection to activate the battery.
[0012] In use, U2 is a series-parallel connected lithium battery pack, U1 is a protection board that controls the negative terminal of the battery and has an automatic sleep mode, U3 is an illuminated switch assembly, P+ is the positive terminal of the battery discharge port, P- is the negative terminal of the battery discharge port, R1 is a 10K protection resistor attached to the illuminated switch, and LED1 is an indicator light. When the illuminated switch assembly U3 is turned on, the first LED indicator LED1 lights up, and the switch triggers the protection board U1 to conduct the MOSFET, allowing the positive terminal P+ and the negative terminal P- of the lithium battery discharge port to discharge. If the battery enters sleep mode, U1 will turn off the MOSFET at the negative terminal B- of the battery, disconnecting the negative terminal of LED1, and LED1 will turn off, indicating that the battery has entered sleep mode. Alternatively, if the illuminated switch U3 is directly turned off, it will trigger the sleep mode of U1, disconnecting the positive terminal of the first LED indicator, and the first LED indicator will turn off, indicating that the battery has entered sleep mode.
[0013] The advantages of this design are: it allows for direct observation of whether the battery has entered a dormant state, is simple and clear, facilitates easy battery operation for the elderly, and makes it easier for maintenance personnel to troubleshoot battery faults.
[0014] The advantages of this design scheme compared to previous designs are: LED1 serves as a continuous monitoring and visualization tool. When the battery is in working condition, LED1 is always lit. When the battery is in sleep mode, LED1 is turned off, which can intuitively inform the end user of the battery status and prevent misjudgment of the battery status.
[0015] Figure 2 The sleep control process for the protection board shown is as follows: S1, the protection board monitors the battery discharge current; S2. Determine if the discharge current is ≥1A; S3. In step S2 above, if the determination is yes, then the following task is executed: S31. The wheelchair is determined to be in working condition, and sleep time monitoring is not performed; S32. With the battery powered on, the discharge MOSFET is turned on, and LED1 is lit. S4. After completing step S3 above, return to the loop and repeat step S2 above; S5. In step S2 above, if the determination is negative, then the following task is performed: S51. The wheelchair is determined to be in standby or off state; S52. When the battery is in the power-on state, the MOSFET is turned on and LED1 is lit. S53. The protection board starts a sleep timer; S6. Determine whether the timer in step S5 above has reached 15 hours; S7. If the above S6 step is not true, then continue timing and return to the above S6 step while continuing timing; S8. If the above step S6 is correct, then perform the following task: S81. The battery is in sleep mode, the discharge MOSFET is turned off, and LED1 is off; S82. The protection board enters sleep mode; S9. In step S8 above, after the protection board enters the sleep state, it is determined whether K1 is triggered; S10. If the above step S9 is not found to be true, then the following task is performed: S101. Battery is activated; S102. The battery is switched on, the discharge MOSFET is turned on, and LED1 is lit. S103. The protection board continues to monitor the discharge current and returns to the cycle of step S1 above; S11. If the above step S9 is correct, then perform the following task: S111. The battery is in sleep mode, the discharge MOSFET is turned off, and LED1 is off; S112. The protection board enters a sleep state and returns to the loop to step S9 above.
[0016] The above content and structure describe the basic principles, main features, and advantages of this utility model, which should be understood by those skilled in the art. The examples and descriptions above are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A powered wheelchair lithium battery hibernation monitoring device comprising lithium battery cell series-parallel connected battery pack, characterized in that: It also includes a protection board, a discharge MOSFET assembly, and a switch assembly with indicator lights. The positive terminal of the lithium battery discharge port is electrically connected to the positive terminal of the series-parallel connected lithium battery cell battery pack. The negative terminal of the series-parallel connected lithium battery cell battery pack is connected in series with the discharge MOSFET assembly and then electrically connected to the negative terminal of the lithium battery discharge port. A switch assembly with indicator lights is connected in parallel between the positive and negative terminals of the lithium battery discharge port and is electrically connected to the protection board. The protection board is used to provide automatic sleep control monitoring for the series-parallel connected lithium battery cell battery pack. The switch assembly with indicator lights is used for continuous sleep monitoring visualization of automatic sleep control detection. When the battery is in working state, the indicator light is always on. When the battery is in sleep state, the indicator light is off.
2. The electric wheelchair lithium battery hibernation monitoring device according to claim 1, characterized in that: The discharge MOS transistor assembly includes a first switching diode and a second switch connected in parallel. The cathode of the first switching diode is electrically connected to the negative terminal of the lithium battery discharge port.
3. The electric wheelchair lithium battery hibernation monitoring device according to claim 1, characterized in that: The indicator light switch assembly includes a first normally open switch, a first resistor, and a first LED indicator light. One end of the first normally open switch is electrically connected to the positive terminal of the lithium battery discharge port, the other end of the first normally open switch is electrically connected to the first resistor, the other end of the first resistor is electrically connected to the positive terminal of the first LED indicator light, and the negative terminal of the first LED indicator light is electrically connected to the negative terminal of the lithium battery discharge port. The other end of the first normally open switch is electrically connected to the protection board.