Garden electric vehicle power battery pack control system and garden electric vehicle thereof

Abstract

The utility model provides a kind of garden electric vehicle power battery pack control system, including multiple structures same power battery pack and main BMS control module;Multiple power battery packs form parallel structure;The power battery pack includes electric core group, charge-discharge control circuit, power supply interface and sub BMS control module;The positive pole of the power battery pack is electrically connected with power supply interface through charge-discharge control circuit, and the power supply interface is electrically connected with whole vehicle drive control system, and the control end of the charge-discharge control circuit is connected with sub BMS control module, and the sub BMS control module is connected with main BMS control module communication, and the main BMS control module is connected with whole vehicle drive control system communication, by above structure, effectively reduce security risk, entire system can be made with good scalability, convenient to use.

Description

Technical Field

[0001] This utility model relates to a battery pack control system, and more particularly to a power battery pack control system for a garden electric vehicle and the garden electric vehicle thereof. Background Technology

[0002] In garden electric vehicles, the current battery power system generally adopts a multi-pack parallel architecture with small capacity. In this architecture, the internal self-protection power cut-off device of a single battery pack is not available. Instead, the positive and negative terminals of a single battery pack are directly led out through wires and connected to the main controller of the PDU (Power Distribution Unit). This has the following drawbacks:

[0003] When a single battery pack experiences a cell failure protection fault or an external lead short circuit, causing the cell to be over-discharged, existing technology cannot quickly and effectively cut off the power supply output circuit of the battery pack, resulting in severe damage to the cell and potentially causing a fire. Therefore, it poses a serious safety hazard.

[0004] On the other hand, the battery packs in the existing technology have limited capacity. In order to increase the range, the number of battery packs needs to be increased. However, the connection structure of the battery packs in the existing garden electric vehicles makes the aforementioned safety hazards more prominent.

[0005] Therefore, in order to solve the above-mentioned technical problems, it is urgent to propose a new technical approach. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a power battery pack control system for garden electric vehicles. By setting up a multi-battery pack structure with each battery pack connected in parallel and a charging and discharging control circuit in each battery pack, the battery packs of the garden electric vehicle are independent of each other during charging and discharging. When any battery pack fails, the faulty battery pack can be disconnected in time, so as not to affect other battery packs and effectively reduce safety hazards. Moreover, since each battery pack has its own BMS control module and a main BMS control module is set up, combined with the parallel structure, the whole system has good scalability and is easy to use.

[0007] This utility model provides a power battery pack control system for a garden electric vehicle, which includes multiple power battery packs with the same structure and a main BMS control module.

[0008] Multiple power battery packs are connected in parallel.

[0009] The power battery pack includes a cell group, a charge and discharge control circuit, a power supply interface, and a sub-BMS control module;

[0010] The positive terminal of the power battery pack is electrically connected to the power supply interface through a charge / discharge control circuit. The power supply interface is electrically connected to the vehicle drive control system. The control terminal of the charge / discharge control circuit is connected to the sub-BMS control module. The sub-BMS control module is communicatively connected to the main BMS control module. The main BMS control module is communicatively connected to the vehicle drive control system.

[0011] Furthermore, the charge / discharge control circuit includes a PMOS transistor QC and a PMOS transistor QD;

[0012] The drain of the PMOS transistor QC is connected to the positive terminal of the battery cell assembly, the source of the PMOS transistor QC is connected to the source of the PMOS transistor QD, and the drain of the PMOS transistor QD is connected to the power supply interface; the gates of the PMOS transistors QD and QC are respectively connected to the control output terminal of the sub-BMS control module.

[0013] Furthermore, the power battery pack also includes a pre-charging branch, which includes a current-limiting resistor R1 and a control switch. One end of the resistor R1 is connected to the drain of the PMOS transistor QD, and the other end of the resistor R1 is connected to the input terminal of the control switch. The output terminal of the control switch is connected to the drain of the PMOS transistor QC, and the control terminal of the control switch is connected to the control terminal of the sub-BMS control module.

[0014] Furthermore, the control switch is a MOSFET Q1.

[0015] Furthermore, the power battery pack also includes a fuse F, and the drain of the PMOS transistor QC is connected to the positive terminal of the cell assembly through the fuse F.

[0016] Furthermore, the sub-BMS control module is connected to the main BMS control module via a CAN bus.

[0017] Furthermore, the main BMS control module is connected to the vehicle drive control system via a CAN bus.

[0018] Accordingly, the present invention also provides a garden electric vehicle, which has the above-mentioned garden electric vehicle power battery pack control system.

[0019] The beneficial effects of this utility model are as follows: By setting up a multi-battery pack structure with each battery pack connected in parallel and a charging and discharging control circuit in each battery pack, the battery packs of the garden electric vehicle are independent during charging and discharging. When any battery pack malfunctions, the faulty battery pack can be disconnected in time, thus not affecting other battery packs and effectively reducing safety hazards. Moreover, since each battery pack has its own BMS control module and a main BMS control module is set up, combined with the parallel structure, the entire system has good scalability and is easy to use. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0022] The present invention will be further described in detail below:

[0023] This utility model provides a power battery pack control system for a garden electric vehicle, which includes multiple power battery packs with the same structure and a main BMS control module.

[0024] Multiple power battery packs are connected in parallel.

[0025] The power battery pack includes a battery pack (BaP for short), a charge and discharge control circuit, a power supply interface (PSI for short) and a sub-BMS control module.

[0026] The positive terminal of the power battery pack is electrically connected to the power supply interface PSI via a charge / discharge control circuit. The power supply interface is electrically connected to the vehicle drive control system. The control terminal of the charge / discharge control circuit is connected to the sub-BMS control module. The sub-BMS control module is communicatively connected to the main BMS control module. The main BMS control module is communicatively connected to the vehicle drive control system. The battery cells BaP of the power battery pack supply power to the vehicle drive control system via the power supply interface PSI. Simultaneously, during charging, the electrical energy obtained by the vehicle drive control system from the grid is converted into DC and then charged to the battery cells BaP via the power supply interface and the charge / discharge control circuit. Through the above structure, by setting up a multi-battery pack structure, and by setting up a charge / discharge control circuit in each battery pack, the battery packs of the garden electric vehicle are independent of each other during charging and discharging. When any battery pack fails, it can be disconnected in time, so as not to affect other battery packs and effectively reduce safety hazards. Moreover, since each battery pack has its own BMS control module and a main BMS control module is set up, combined with the parallel structure, the entire system has good scalability and is easy to use.

[0027] In the above structure, information from all sub-BMS control modules is uploaded to the main BMS control module and then transmitted to the vehicle drive control system. The vehicle drive control system itself carries a controller to achieve vehicle control. The sub-BMS control modules and the main BMS control module are implemented using existing technologies, and their structure and principles will not be elaborated here. Due to the use of sub- and main BMS control modules, the stability of data transmission can be guaranteed. Even if any battery pack fails and does not work, it will not affect the working status of other battery packs, thus ensuring the stability of the entire system.

[0028] In this embodiment, the charge / discharge control circuit includes a PMOS transistor QC and a PMOS transistor QD;

[0029] The drain of the PMOS transistor QC is connected to the positive terminal of the battery cell assembly BaP, the source of the PMOS transistor QC is connected to the source of the PMOS transistor QD, and the drain of the PMOS transistor QD is connected to the power supply interface. The gates of the PMOS transistors QD and QC are respectively connected to the control output terminal of the sub-BMS control module. Through the above structure, the charging and discharging of the battery cell assembly can be controlled. For example, if the battery cell temperature is too high or the battery cell charging current is too large, the circuit can be disconnected to protect the battery cell assembly and ensure the safety of the entire system. The fault signals of the battery cell assembly include temperature, current, and voltage, which are detected by existing temperature, current, and voltage sensors and then transmitted to the sub-BMS control module, which controls the on / off state of the charging and discharging circuit.

[0030] In this embodiment, the power battery pack further includes a pre-charging branch, which includes a current-limiting resistor R1 and a control switch. One end of the resistor R1 is connected to the drain of the PMOS transistor QD, and the other end of the resistor R1 is connected to the input terminal of the control switch. The output terminal of the control switch is connected to the drain of the PMOS transistor QC, and the control terminal of the control switch is connected to the control terminal of the sub-BMS control module. In practice, to ensure the stability of the input and output of the battery cell group, a capacitor is connected in parallel between the positive and negative terminals of the entire battery cell group. However, in this structure, without the pre-charging branch, the charging current directly charges the capacitor when the power is applied. At this time, the charging current is relatively large, which can easily cause the capacitor to break down, thereby causing a power supply failure. With the above structure, due to the presence of the pre-charging branch, the pre-charging branch is preferentially turned on when the power is applied. Due to the presence of the current-limiting resistor, the charging current can be reduced. After a certain period of time, the charging and discharging control circuit is turned on, thereby playing a good protective role.

[0031] In this embodiment, the control switch is a MOS transistor Q1. The MOS transistor Q1 can be implemented using a PMOS transistor or an NMOS transistor. Under the above structure, the switching response speed is fast, the conduction loss is low, and the reliability is high.

[0032] In this embodiment, the power battery pack also includes a fuse F. The drain of the PMOS transistor QC is connected to the positive terminal of the battery cell assembly through the fuse F. Although the charging and discharging control circuit can perform protection when the current is too high during charging and discharging, the sensor monitoring has a certain response delay. When the current is too high, such as exceeding the fuse's melting current, if there is no fuse, it will cause the battery cell assembly to burn out or even cause a fire. Through the function of the fuse F, the entire system can be well protected.

[0033] In this embodiment, the sub-BMS control module is connected to the main BMS control module via a CAN bus; the main BMS control module is connected to the vehicle drive control system via a CAN bus. This structure provides high transmission efficiency, good real-time performance, and facilitates the control response of the entire system.

[0034] Accordingly, the present invention also provides a garden electric vehicle, which has the above-mentioned garden electric vehicle power battery pack control system.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A power battery pack control system for a garden electric vehicle, characterized in that: It includes multiple power battery packs with the same structure and a main BMS control module; Multiple power battery packs are connected in parallel. The power battery pack includes a cell group, a charge and discharge control circuit, a power supply interface, and a sub-BMS control module; The positive terminal of the power battery pack is electrically connected to the power supply interface through a charge / discharge control circuit. The power supply interface is electrically connected to the vehicle drive control system. The control terminal of the charge / discharge control circuit is connected to the sub-BMS control module. The sub-BMS control module is communicatively connected to the main BMS control module. The main BMS control module is communicatively connected to the vehicle drive control system.

2. The power battery pack control system for garden electric vehicles according to claim 1, characterized in that: The charge / discharge control circuit includes a PMOS transistor QC and a PMOS transistor QD. The drain of the PMOS transistor QC is connected to the positive terminal of the battery cell assembly, the source of the PMOS transistor QC is connected to the source of the PMOS transistor QD, and the drain of the PMOS transistor QD is connected to the power supply interface; the gates of the PMOS transistors QD and QC are respectively connected to the control output terminal of the sub-BMS control module.

3. The power battery pack control system for garden electric vehicles according to claim 2, characterized in that: The power battery pack also includes a pre-charging branch, which includes a current-limiting resistor R1 and a control switch. One end of the resistor R1 is connected to the drain of the PMOS transistor QD, and the other end of the resistor R1 is connected to the input terminal of the control switch. The output terminal of the control switch is connected to the drain of the PMOS transistor QC, and the control terminal of the control switch is connected to the control terminal of the sub-BMS control module.

4. The power battery pack control system for garden electric vehicles according to claim 3, characterized in that: The control switch is a MOSFET Q1.

5. The power battery pack control system for garden electric vehicles according to claim 2, characterized in that: The power battery pack also includes a fuse F, and the drain of the PMOS transistor QC is connected to the positive terminal of the cell assembly through the fuse F.

6. The power battery pack control system for garden electric vehicles according to claim 1, characterized in that: The sub-BMS control module is connected to the main BMS control module via a CAN bus.

7. The power battery pack control system for garden electric vehicles according to claim 1, characterized in that: The main BMS control module is connected to the vehicle drive control system via a CAN bus.

8. A garden electric vehicle, characterized in that: The garden electric vehicle has a power battery pack control system as described in any one of claims 1-7.

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