CN217278830U

CN217278830U - Electric fork-lift power battery insulation detection system

Info

Publication number: CN217278830U
Application number: CN202221066687.5U
Authority: CN
Inventors: 陈兵; 周德清; 张树森; 徐永贵; 任海新; 杨云求
Original assignee: Anhui Yijiatong Battery Co ltd
Current assignee: Anhui Yijiatong Battery Co ltd
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2022-08-23
Anticipated expiration: 2032-05-06

Abstract

The utility model discloses an electric fork-lift power battery insulation detection system, which comprises a BMS, a power-on switch and an insulation detection module, wherein the power-on switch is connected with the BMS and is used for controlling and activating the power-on work of the BMS; the BMS is connected with an insulation detection module, and the insulation detection module is arranged at the two ends of the anode and the cathode of the power battery and is used for detecting electric signals reflecting the insulation state; the output end of the BMS is connected with the delay module, and the delay module is connected with the control end of a main positive relay of the power battery. The utility model has the advantages that: the detection circuit is simple and reliable, the detection result is accurate, the battery insulation fault can be accurately detected, the influence of vehicle insulation on the battery insulation fault is avoided, the battery insulation state can be effectively monitored for a battery manufacturer, and after-sale maintenance is facilitated.

Description

Electric fork-lift power battery insulation detection system

Technical Field

The invention relates to the field of electric forklifts, in particular to an insulation detection system for a power battery of an electric forklift.

Background

The electric forklift takes a large-capacity power battery as a power source, and the safety problem of electric appliances exists in the operation process. One of the prerequisites that the main electrical components (motor, electric control and battery) of the electric forklift can normally and safely operate is that the insulation degree of the insulation material meets the requirement. Due to the complexity of the service environment of the electric forklift, when the electric parts of the battery are heated or damp, the insulating material is easy to age, the insulating degree of the insulating material is reduced, and therefore electric leakage or short circuit of the electric parts is possibly caused, and personal injury is brought to users. If the battery has insulation fault, generally, a battery manufacturer is required to inspect and maintain on site in time, the insulation state of the electric forklift can be monitored in real time after the forklift is electrified in the prior art, but after the whole forklift is electrified, a main positive relay of the power battery is closed, the insulation state detected at the moment can only reflect the insulation state of the electric forklift, if the vehicle has insulation fault, an insulation detection system of the battery system can also break down, so that the insulation detection of the battery system is alarmed, and then the insulation fault of the power battery or the insulation fault of the vehicle body can not be confirmed in time when the vehicle reports the insulation fault, and troubles are brought to maintenance and inspection. Therefore, the insulation condition of the battery cannot be accurately detected, and troubles are caused for the maintenance of a battery manufacturer.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide an electric fork-lift insulation detecting system, the mode through time delay control is at the electricity back of going up at every turn and main positive relay closed before carrying out power battery's insulation and detecting, detection electric fork-lift power battery's that can be effective accurate insulating state.

In order to achieve the purpose, the invention adopts the technical scheme that: an insulation detection system for a power battery of an electric forklift comprises a BMS, a power-on switch and an insulation detection module, wherein the power-on switch is connected with the BMS and used for controlling and activating the power-on work of the BMS; the BMS is connected with an insulation detection module, and the insulation detection module is arranged at the two ends of the anode and the cathode of the power battery and is used for detecting electric signals reflecting the insulation state; the output end of the BMS is connected with the delay module, and the delay module is connected with the control end of a main positive relay of the power battery.

The time delay module comprises a time delay relay, the control end of the time delay relay is connected with the BMS, and the switch contact of the time delay relay is connected between the control power supply and the main positive relay in series and used for controlling the action of the contact of the main positive relay.

The BMS is connected with a communication module, and the communication module uploads the insulation data to a battery monitoring server in a wireless communication mode.

The BMS is connected with the positioning module, and the positioning module is used for collecting the position information of the electric forklift and feeding the position information back to the battery monitoring server.

The BMS is communicated with the vehicle CAN network and used for sending the power battery insulation information of the vehicle to the vehicle CAN network, and the human-computer interaction system of the vehicle gives an alarm after acquiring the insulation information in the vehicle CAN network.

The utility model has the advantages that: the detection circuit is simple and reliable, the detection result is accurate, the battery insulation fault can be accurately detected, the influence of vehicle insulation on the battery insulation fault is avoided, the battery insulation state can be effectively monitored for a battery manufacturer, and after-sale maintenance is facilitated.

Drawings

The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:

fig. 1 is the schematic view of the principle of the insulation detection system of the present invention.

Detailed Description

The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.

This application improves based on prior art for the realization battery's that can be more accurate insulation detection avoids the battery manufacturer that can't accurately detect the battery insulation fault and cause frequently or wrong carry out the on-the-spot maintenance after sale when insulation detection. The prior art scheme is as follows: the BMS is powered on after the power-on switch is pressed down, the BMS can drive the main positive relay to be closed after the power-on to complete the high voltage on the whole vehicle, simultaneously the insulation condition at two ends of the output end of the power battery is detected through the insulation detection module, then the alarm is given, the insulation detection is carried out according to the mode, because the main positive relay of the power battery is powered and is connected with the whole vehicle actually during the insulation detection, the detected insulation fault can be the insulation fault of the power battery or the insulation fault of the vehicle part connected with the battery, so that the differentiation can not be carried out, the after-sale battery maintenance of a battery manufacturer by a customer mistake can not be carried out, the condition of the insulation fault of the battery can not be differentiated, the after-sale maintenance and the maintenance of a battery supplier are not good, and the insulation detection system in the prior art needs to be improved so as to be capable of differentiating whether the insulation fault of the battery or not, therefore, insulation detection data are provided for the maintenance of a battery manufacturer and the maintenance monitoring of the electric forklift.

The main improvement points of the application based on the prior art are two aspects: 1. aiming at insulation detection, a delay module is added in a control loop of a main positive relay controlled by a BMS (battery management system), a control signal of the BMS is output in a delayed manner, a certain time difference exists between the work of the main positive relay and the detection of the insulation detection module due to the simultaneous output control after the BMS is electrified, namely, the main positive relay is not closed due to the delay action of the delay module when the insulation detection module carries out insulation detection, and the power battery and a vehicle are in an electrically disconnected state, so that the detected insulation state is the insulation state of the power battery, and accurate insulation state detection can be obtained; 2. the integrated wireless communication module monitors the insulation state of the power battery, and is convenient for battery manufacturers to monitor and sell the power battery. The specific scheme is as follows:

as shown in fig. 1, an insulation detection system for a power battery of an electric forklift comprises a BMS, a power-on switch, an insulation detection module and a delay module; the power-on switch is connected with the BMS and is used for controlling and activating the BMS to perform power-on work; the BMS is connected with the insulation detection module, and the insulation detection module is arranged at the two ends of the anode and the cathode of the power battery and is used for detecting electric signals reflecting the insulation state; the output end of the BMS is connected with the delay module, and the delay module is connected with the control end of a main positive relay of the power battery. The working principle is as follows: when the electric forklift needs to be started, the whole forklift enters a power-on stage after the power-on switch is pressed down, the BMS enters self-checking after receiving an electric signal of the power-on switch and respectively sends out control signals for controlling the main positive relay to be closed and controlling the insulation detection module to perform insulation detection on the power battery pack after the self-checking is finished, the insulation detection module performs insulation signal detection after receiving the control signals and feeds the control signals back to the BMS, the main positive relay can be controlled to be closed only after a period of time delay by the control signal for closing the main positive relay, therefore, the main positive relay is still in a delay stage and is not closed when the insulation detection module detects the insulation signal, so that the insulation signal detected by the insulation detection module by the BMS is the insulation signal of the battery, whether the battery has insulation fault or not can be accurately judged based on the insulation signal, and the accurate detection of the insulation fault of the battery is realized.

The power-on switch mainly triggers the vehicle power-on when the electric fork-lift truck needs to be powered on, and the power-on switch can be independently arranged or integrated on the ignition start button of the electric fork-lift truck, and the power-on work of the BMS is driven after the signal is sent out, and meanwhile, the high-voltage action and the like on a VCU of the vehicle can be driven, so that the start of the electric fork-lift truck and the work of the BMS are realized.

BMS is battery management system, mainly handles and controls the temperature, the insulating signal of battery, for the integrated control system of car interior battery package, power battery integration, thereby can send the closed control signal of main positive relay of control respectively after its start-up work and realize starting high pressure, can detect the insulating state signal at battery both ends through insulating detection module simultaneously, judges the insulation of battery based on the state that detects.

The insulation detection module adopts circuits corresponding to a balance bridge method specified by national standards to be arranged at the output positive and negative ends of the power battery pack, and the output end of the insulation detection module is connected with the BMS to send detected data to the BMS in an insulation state of the collector, and the BMS can judge whether insulation faults occur based on the detected data.

The time delay module can be generally set to be between 1 and 3s, the time cannot be too long or too short, the normal power-on use of the vehicle is influenced by the too long time, the detection data of the insulation detection module is inaccurate due to the too short time, and therefore 3s is set to be more proper or between 1 and 3 s. Send the main closed signal that just relays after BMS starts work, this signal needs can control main just relay after the time delay 3s, and simultaneously because insulating detection module will send the detected signal to it after BMS starts work, whether the BMS can judge the battery to have insulation fault in this 3 s' delay time to accurate when battery package insulation fault detects.

The time delay module can be realized by adopting a time delay chip and a time delay relay, the time delay relay is introduced by taking the time delay relay as an example, the control end of the time delay relay is connected with the BMS and receives the input of a control signal of the BMS, and a switch contact of the time delay relay is connected between a control power supply and the main positive relay in series and is used for controlling the action of the contact of the main positive relay. When the delay time reaches, the switch contact of the delay relay is closed, the control power supply and the control end of the main positive relay are connected and conducted, the control power supply drives the main positive relay to be closed, and the main positive relay is closed, so that the high-voltage power supply output of the whole vehicle is realized. The control power supply can be obtained by using a low-voltage storage battery or a vehicle-required battery through DCDC conversion.

In a preferred embodiment of the present application, when an accurate battery fault state is detected, the battery fault state needs to be monitored and obtained by a battery manufacturer in time, so that the repair and after-sale of the manufacturer are facilitated, and since the insulation fault of the battery needs to be maintained by the manufacturer, the timely acquisition of the insulation fault information is very important for the maintenance. In the present application, the insulation state is collected and monitored by a communication module. The communication module adopts a 2g communication chip, the cost is low, and the communication speed and the bandwidth meet the requirements. The 2g communication chip is integrated in the BMS or the power battery or integrated on the electric forklift in a plug-in mode, the BMS is connected with the 2g communication chip through a communication protocol, the 2g communication chip transmits data to a battery monitoring server of a battery manufacturer in a 2g communication network mode for remote monitoring, the purpose of monitoring the insulation state in time is achieved, the monitoring server is configured to be in network communication with the 2g communication chip, therefore, the uploading function of the data is achieved, the server can be configured with a display screen and a mouse keyboard for control, or a client side can conveniently check and call the background.

Certainly in order to further know the position of vehicle when electric fork-lift truck insulation fault fast, can be in power battery integrated orientation module or set up BMS into through can network connection vehicle-mounted orientation module, orientation module can gather the positional information of vehicle and upload to battery monitoring server in with data through BMS, for battery manufacturer's after sales service provides positional data, wherein orientation module can be integrated in the battery or on-vehicle location chip, the location chip adopts GPS or big dipper positioning system. Further, an ID identification number of the power battery can be written in the BMS, the identity of the power battery can be distinguished conveniently, the ID is recorded in a sales record database of a battery manufacturer and corresponds to sales record information of the ID, the battery ID and the corresponding sales information can be called quickly when after-sales maintenance is facilitated, the sales information comprises but is not limited to customer information, customer contacts, contact ways, customer addresses and the like, a sales record database is formed, and the sales record database is connected with the battery monitoring server and is convenient to call after-sales.

When the battery insulation fault occurs, a battery manufacturer is required to know the record, and a user of the electric forklift is required to be informed of the record in time, so that unsafe use in the insulation fault state is avoided. And the power battery insulation fault is alarmed through a man-machine interaction system of the vehicle, so that a user is reminded to look up attention. The man-machine interaction system of the vehicle can comprise an alarm, an alarm lamp, a vehicle-mounted central control screen or other man-machine interaction units capable of sending alarm signals on the forklift, and mainly starts an alarm reminding function for people.

This application has realized through the closure of time delay control main positive relay that just the power battery carries out insulation detection before main administrative relay is closed just namely power battery and vehicle are established and are connected, has guaranteed that insulation detection belongs to power battery's insulating state, can accurately detect out power battery's insulation fault, for battery manufacturer's after-sales maintenance provides accurate data support, the manpower after-sales maintenance cost of battery manufacturer that has avoided wrong warning to arouse, and the reason detects more reliably accurately.

It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.

Claims

1. The power battery insulation detection system of the electric forklift comprises a BMS, a power-on switch and an insulation detection module, wherein the power-on switch is connected with the BMS and used for controlling and activating the BMS to be powered on; the BMS is connected with an insulation detection module, and the insulation detection module is arranged at the two ends of the anode and the cathode of the power battery and is used for detecting electric signals reflecting the insulation state; the method is characterized in that: the output end of the BMS is connected with the delay module, and the delay module is connected with the control end of a main positive relay of the power battery.

2. The system for detecting the insulation of the power battery of the electric forklift as claimed in claim 1, wherein: the time delay module comprises a time delay relay, the control end of the time delay relay is connected with the BMS, and the switch contact of the time delay relay is connected between the control power supply and the control end of the main positive relay in series and used for controlling the action of the contact of the main positive relay.

3. The system for detecting the insulation of the power battery of the electric forklift as claimed in claim 1, wherein: the BMS is connected with a communication module, and the communication module uploads the insulation data to a battery monitoring server in a wireless communication mode.

4. The system for detecting insulation of the power battery of the electric forklift as claimed in claim 3, wherein: the BMS is connected with the positioning module, and the positioning module is used for collecting the position information of the electric forklift and feeding the position information back to the battery monitoring server.

5. The system for detecting the insulation of the power battery of the electric forklift as claimed in any one of claims 1 to 4, wherein: the BMS is communicated with the vehicle CAN network and used for sending the power battery insulation information of the vehicle to the vehicle CAN network, and the human-computer interaction system of the vehicle gives an alarm after acquiring the insulation information in the vehicle CAN network.