CN219427948U

CN219427948U - New forms of energy light-duty passenger train is with filling system slowly

Info

Publication number: CN219427948U
Application number: CN202320789764.8U
Authority: CN
Inventors: 陈钦松; 陈新现; 余永龙; 章莉; 叶剑双; 陈晓冰; 骆俊勇; 柳家福
Original assignee: Xiamen Jinlong Automobile New Energy Technology Co ltd
Current assignee: Xiamen Jinlong Automobile New Energy Technology Co ltd
Priority date: 2023-04-11
Filing date: 2023-04-11
Publication date: 2023-07-28
Anticipated expiration: 2033-04-11

Abstract

The utility model discloses a slow charging system for a new energy light bus, which relates to the technical field of electric automobiles and comprises a charger, a controller, a battery management system and at least two charging bases with different charging powers; the controller comprises a temperature detection circuit and a main control chip, wherein the temperature detection circuit is electrically connected with the charging base, and the main control chip is electrically connected with the charger and the temperature detection circuit and is in communication connection with the battery management system. The main control chip judges the selected charging base and whether the temperature of the charging base needs to be acquired according to the charging instruction of the battery management system, so that whether the temperature detection circuit is controlled to acquire the temperature is determined, the defects of the prior art are overcome, the slow charging system can be simultaneously adapted to the charging bases of different signals, and the compatibility and the intelligent level of the slow charging system are effectively improved.

Description

New forms of energy light-duty passenger train is with filling system slowly

Technical Field

The utility model relates to the technical field of electric automobiles, in particular to a slow charging system for a new energy light bus.

Background

The charging system of the new energy bus comprises a vehicle-mounted charger, a DCDC converter, a charging base and other parts, and in order to ensure charging safety, the existing charging system is generally provided with a temperature detection module for collecting the temperature of the charging base before or during charging, and when the temperature abnormality is detected, the charging is not carried out, or the charging is stopped immediately.

However, according to national standard requirements, when a light bus with the length of 4.5-5.4 m is slowly charged, the temperature detection is needed for a charging base with the length of 6.6kW, and the temperature detection is not needed for a charging base with the length of 3.3 kW. This results in the existing charging system being unable to adapt to both 3.3kW and 6.6kW charging bases simultaneously, and therefore has the problem of poor compatibility.

In addition, in order to adapt to the development direction of integration and light weight of electric automobiles, part of new energy buses currently start to use integrated vehicle-mounted chargers and DCDC converters. However, the integrated design of the existing vehicle-mounted charger and the DCDC converter is mostly limited to the integration of a physical layer, but does not involve the deep integration of an electrical layer, so that the overall weight of the vehicle-mounted charger and the DCDC converter is still large, and the light-weight design cannot be truly realized.

Disclosure of Invention

The utility model provides a slow charging system for a new energy light bus, which mainly aims to solve the problems in the prior art.

The utility model adopts the following technical scheme:

a slow charging system for a new energy light bus comprises a charger, a controller, a battery management system and at least two charging bases with different charging powers; the controller comprises a temperature detection circuit and a main control chip, wherein the temperature detection circuit is electrically connected with the charging base, and the main control chip is electrically connected with the charger and the temperature detection circuit and is in communication connection with the battery management system; the main control chip judges the selected charging base and whether the temperature of the charging base needs to be acquired according to the charging instruction of the battery management system, so as to determine whether to control the temperature detection circuit to acquire the temperature.

Further, the charging base comprises a 3.3kW charging base and a 6.6kW charging base; the 3.3kW charging base is not provided with a thermistor, and the 6.6kW charging base is provided with a thermistor electrically connected to the temperature detection circuit.

Further, the charging device further comprises an LED lamp, wherein the LED lamp is connected to the controller and used for prompting the temperature state of the charging base.

Further, the charger comprises a PFC circuit, an OBC circuit and a DCDC conversion circuit which are electrically connected in sequence; the PFC circuit is connected with an external power supply, the OBC circuit is connected with a battery pack, and the DCDC conversion circuit is connected with a storage battery; the main control chip is electrically connected with the OBC circuit and the DCDC conversion circuit.

Still further, the charger also comprises an LV low-voltage circuit, wherein the LV low-voltage circuit is connected between the DCDC conversion circuit and the storage battery.

Still further, PFC circuit is equipped with PFC control chip, OBC circuit is equipped with CLLC control chip, PFC control chip with CLLC control chip passes through CAN bus communication connection.

Further, the chip model of the main control chip is LQFP100.

Further, the battery charger also comprises a low-voltage auxiliary power supply electrically connected with the controller and the charger.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the main control chip judges the selected charging base and whether the temperature of the charging base needs to be acquired according to the charging instruction of the battery management system, so that whether the temperature detection circuit is controlled to acquire the temperature is determined, the defects of the prior art are overcome, the slow charging system can be simultaneously adapted to the charging bases with different signals, and the compatibility and the intelligent level of the slow charging system are effectively improved.

2. According to the utility model, the vehicle-mounted charger and the DCDC converter are deeply integrated on the electrical level, so that the light-weight requirement of the new energy bus can be better met.

Drawings

Fig. 1 is a functional block diagram of the present utility model.

Fig. 2 is a circuit configuration diagram of the present utility model.

FIG. 3 is a schematic diagram of a temperature detection circuit according to the present utility model.

Fig. 4 is a circuit board diagram of a main control chip in the present utility model.

Detailed Description

Specific embodiments of the present utility model will be described below with reference to the accompanying drawings. Numerous details are set forth in the following description in order to provide a thorough understanding of the present utility model, but it will be apparent to one skilled in the art that the present utility model may be practiced without these details.

As shown in fig. 1 and 2, a slow charging system for a new energy light bus comprises a charger, a controller, a battery management system and at least two charging bases with different charging powers; the controller comprises a temperature detection circuit and a main control chip, wherein the temperature detection circuit is electrically connected to the charging base, and the main control chip is electrically connected to the charger and the temperature detection circuit and is in communication connection with the battery management system. The main control chip judges the selected charging base and whether the temperature of the charging base needs to be acquired according to the charging instruction of the battery management system, so as to determine whether to control the temperature detection circuit to acquire the temperature.

As shown in fig. 1 and 2, specifically, the charging base includes a 3.3kW charging base and a 6.6kW charging base, the 3.3kW charging base is not provided with a thermistor, and the 6.6kW charging base is provided with a thermistor electrically connected to the temperature detection circuit. When the charging instruction received by the main control chip is 3.3kW for charging, the temperature acquisition is not needed, and the temperature detection circuit does not work at the moment, so that the normal charging is not influenced by failure due to the fact that no signal is detected; when the charging instruction received by the main control chip is 6.6kW for charging, the temperature acquisition is required, and the main control chip controls the temperature detection circuit to detect the resistance value of the thermistor at the moment, and the temperature value of the charging base is judged. Therefore, the utility model can intelligently identify whether the temperature detection of the charging base is needed or not through the information interaction between the main control chip and the battery management system, so that the slow charging system can be simultaneously adapted to the charging bases with different signals, thereby improving the compatibility and the intelligent level of the slow charging system.

Fig. 3 is a structural diagram of a temperature detection circuit, and the working principle of the temperature detection circuit is as follows: the temperature change of the charging base can cause the resistance value of the thermistor to change, so that the voltage and the current acquired by the temperature detection circuit can change accordingly; the control chip can judge the current temperature value of the charging base through corresponding change table look-up according to the voltage and the current acquired by the temperature detection circuit.

As shown in fig. 1 and 2, the slow charging system further includes an LED lamp connected to the controller for prompting the temperature state of the charging base. According to the utility model, the LED lamp is provided with the green light and the red light, when the temperature of the charging base is detected to be abnormal, the red light is turned on, and when the temperature of the charging base is detected to be normal, or the temperature acquisition is not needed, the green light is turned on, so that a user can more intuitively judge the temperature state of the charging base, and the product experience of the user is higher and more safe.

As shown in fig. 1 and 2, the slow charging system further comprises a low-voltage auxiliary power supply electrically connected to the controller and the charger. The controller and the charger share one power supply, which is beneficial to reducing the production cost and simplifying the equipment structure.

As shown in fig. 1 and 2, the charger comprises a PFC circuit, an OBC circuit and a DCDC conversion circuit which are electrically connected in sequence; the PFC circuit is connected with an external power supply, the OBC circuit is connected with the battery pack, and the DCDC conversion circuit is connected with the storage battery; the main control chip is electrically connected with the OBC circuit and the DCDC conversion circuit. In addition, the charger is also provided with an LV low-voltage circuit, and the LV low-voltage power supply is connected between the DCDC conversion circuit and the storage battery, so that a low-voltage filtering effect can be achieved, and the anti-interference performance is improved. According to the utility model, the vehicle-mounted charger and the DCDC converter are deeply integrated on the electrical level, so that the light-weight requirement can be better met.

As shown in fig. 2, specifically, the PFC circuit includes an EMI filter, an interleaved parallel boost_pfc, a PFC driving isolation chip, and a PFC control chip. The OBC circuit comprises a CLLC primary side, a CLLC secondary side, an HV output turn-off path, a CLLC control chip and a drive isolation chip. The DCDC conversion circuit comprises a phase-shifting full-bridge synchronous rectification, a driving transformer, a driving isolation chip and a DCDC single board. The PFC control chip and the CLLC control chip are in communication connection through the CAN bus, and the main control chip is electrically connected with the CLLC control chip and the DCDC single board. The main control chip and the charger are connected into the CAN bus, so that the OBC circuit and the DCDC conversion circuit CAN realize CAN awakening and CAN dormancy, and the static energy consumption is almost zero.

As shown in fig. 2, as a preferable scheme: the PFC control chip and the CLLC control chip are both selected as DSP28034 chips, and the DCDC single board is selected as UCC28950 chips.

As shown in fig. 2 and 4, as a preferable scheme: the main control chip selects an LQFP100 chip. Specifically, a 46-pin of the control chip is used as a temperature detection signal acquisition end and is connected to the temperature detection circuit. Pins 64, 70, 71 and 73 of the LQFP100 chip are all connected to the DCDC single board, wherein the pin 64 is used as a clock signal output end, the pin 70 is used as a low-voltage overcurrent signal acquisition end of the DCDC single board, the pin 71 is used as a high-voltage overcurrent signal acquisition end of the DCDC single board, and the pin 73 is used as a low-voltage short-circuit signal acquisition end of the DCDC single board. Pins 76 and 77 of the LQFP100 chip are connected to the CLLC control chip, and pins 76 and 77 are respectively used as a control signal output end and a signal acquisition end of the CLLC control chip.

As shown in fig. 2 and 3, as a preferable scheme: the light bus referred to in this embodiment is a light bus of 4.5m to 5m, more precisely a logistics car.

The foregoing is merely illustrative of specific embodiments of the present utility model, but the design concept of the present utility model is not limited thereto, and any insubstantial modification of the present utility model by using the design concept shall fall within the scope of the present utility model.

Claims

1. A slow charging system for a new energy light bus is characterized in that: the battery charging system comprises a charger, a controller, a battery management system and at least two charging bases with different charging powers; the controller comprises a temperature detection circuit and a main control chip, wherein the temperature detection circuit is electrically connected with the charging base, and the main control chip is electrically connected with the charger and the temperature detection circuit and is in communication connection with the battery management system; the main control chip judges the selected charging base and whether the temperature of the charging base needs to be acquired according to the charging instruction of the battery management system, so as to determine whether to control the temperature detection circuit to acquire the temperature.

2. The slow charging system for a new energy light bus as set forth in claim 1, wherein: the charging base comprises a 3.3kW charging base and a 6.6kW charging base; the 3.3kW charging base is not provided with a thermistor, and the 6.6kW charging base is provided with a thermistor electrically connected to the temperature detection circuit.

3. The slow charging system for a new energy light bus as set forth in claim 1, wherein: the charging device further comprises an LED lamp, wherein the LED lamp is connected to the controller and used for prompting the temperature state of the charging base.

4. The slow charging system for a new energy light bus as set forth in claim 1, wherein: the charger comprises a PFC circuit, an OBC circuit and a DCDC conversion circuit which are electrically connected in sequence; the PFC circuit is connected with an external power supply, the OBC circuit is connected with a battery pack, and the DCDC conversion circuit is connected with a storage battery; the main control chip is electrically connected with the OBC circuit and the DCDC conversion circuit.

5. The slow charging system for the new energy light bus as set forth in claim 4, wherein: the charger further comprises an LV low-voltage circuit, and the LV low-voltage circuit is connected between the DCDC conversion circuit and the storage battery.

6. The slow charging system for the new energy light bus as set forth in claim 4, wherein: the PFC circuit is provided with a PFC control chip, the OBC circuit is provided with a CLLC control chip, and the PFC control chip is in communication connection with the CLLC control chip through a CAN bus.

7. The slow charging system for a new energy light bus as set forth in claim 1, wherein: the chip model of the main control chip is LQFP100.

8. The slow charging system for a new energy light bus as set forth in claim 1, wherein: the low-voltage auxiliary power supply is electrically connected with the controller and the charger.