CN219164265U

CN219164265U - BMS overcharge protection circuit and electronic product

Info

Publication number: CN219164265U
Application number: CN202223424258.3U
Authority: CN
Inventors: 郑通明; 田本武
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-06-09
Anticipated expiration: 2032-12-16

Abstract

The utility model discloses a BMS (battery management system) overcharge protection circuit and an electronic product, wherein the circuit comprises a first acquisition circuit, a second acquisition circuit, a first main control circuit and a relay, wherein the first acquisition circuit is used for acquiring a first cell voltage and a first cell temperature of a target cell, generating first cell information and transmitting the first cell information to the first main control circuit; the second acquisition circuit is used for acquiring a second cell voltage and a second cell temperature of the target cell, generating second cell information and transmitting the second cell information to the first main control circuit; the first main control circuit is used for judging whether the target battery cell meets the preset overcharge condition according to the first battery cell information and the second battery cell information, if so, determining that the target battery cell has an overcharge phenomenon and generating overcharge alarm information and a target control instruction of the relay; the relay is used for executing the operation matched with the target control instruction. Therefore, the utility model is beneficial to improving the accuracy and safety of the overcharge protection of the BMS.

Description

BMS overcharge protection circuit and electronic product

Technical Field

The utility model relates to the technical field of batteries, in particular to a BMS (battery management system) overcharge protection circuit and an electronic product.

Background

BMS (Battery Management System) is battery management system, mainly in order to intelligent management and maintain each battery unit, prevents that the battery from appearing overcharging and overdischarging to extension battery's life monitors the state of battery, and can realize the real-time remote monitoring to BMS battery management system, need not to detect on site, has alleviateed the maintenance degree of difficulty of group battery.

At present, for the treatment of the overcharge phenomenon of the BMS in the circuit, the single voltage is generally collected and judged whether the single voltage reaches an overcharge protection threshold, and if the single voltage reaches the overcharge protection threshold, the control relay is disconnected to realize the overcharge protection. However, the existing process for the overcharge of the BMS relies on the collected monomer voltage to determine whether overcharge protection exists, which easily results in an error in determining whether the overcharge exists in the BMS, and thus in a malfunction. It is important to provide a new BMS overcharge protection circuit to improve the accuracy and intelligence of overcharge protection of the BMS.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a BMS overcharge protection circuit and an electronic product, which can improve the accuracy of judging whether the BMS overcharge phenomenon exists in a charging loop, and can timely cut off the charging loop when the overcharge exists, so that the accuracy and the intelligence of the overcharge protection of the BMS are improved, the aim of overcharge protection in a battery system (such as a single battery system) is fulfilled, and the safety of the battery system is further improved.

In order to solve the technical problems, the first aspect of the utility model discloses a BMS overcharge protection circuit, which comprises a first acquisition circuit, a second acquisition circuit, a first main control circuit and a relay, wherein:

the first end of the first acquisition circuit is used for being electrically connected with the first end of the target battery cell, the first end of the second acquisition circuit is used for being electrically connected with the second end of the target battery cell, the first end of the first main control circuit is electrically connected with the second end of the first acquisition circuit, and the second end of the first main control circuit is electrically connected with the relay;

the first acquisition circuit is used for acquiring a first cell voltage and a first cell temperature of the target cell, generating first cell information according to the first cell voltage and the first cell temperature, and transmitting the first cell information to the first main control circuit;

the second acquisition circuit is used for acquiring a second cell voltage and a second cell temperature of the target cell, generating second cell information and transmitting the second cell information to the first main control circuit;

the first main control circuit is used for judging whether the target battery cell meets a preset overcharging condition according to the first battery cell information and the second battery cell information to obtain a judging result, determining that the target battery cell has an overcharging phenomenon when the judging result is used for indicating that the target battery cell meets the preset overcharging condition, generating overcharging alarm information according to the first battery cell information, and generating a target control instruction aiming at the relay according to the first battery cell information;

And the relay is used for executing the operation matched with the target control instruction so as to realize the overcharge protection of the target battery cell.

As an optional implementation manner, in the first aspect of the present utility model, the BMS overcharge protection circuit further includes a second master circuit, wherein:

the first end of the second main control circuit is electrically connected with the third end of the first main control circuit, and the second end of the second main control circuit is used for being electrically connected with a driving console corresponding to the target battery cell;

the second main control circuit is used for transmitting the overcharge alarm information generated by the first main control circuit to the driving console corresponding to the target cell so that the overcharge alarm information is displayed in the display equipment of the driving console corresponding to the target cell.

As an optional implementation manner, in the first aspect of the present utility model, the BMS overcharge protection circuit further includes a third collecting circuit, wherein:

the first end of the third acquisition circuit is used for being electrically connected with the third end of the target battery cell, and the second end of the third acquisition circuit is electrically connected with the second end of the second acquisition circuit;

the third acquisition circuit is used for acquiring a third cell temperature of the target cell;

And the third acquisition circuit and the second acquisition circuit use the same CAN line.

As an alternative embodiment, in the first aspect of the present utility model, the BMS overcharge protection circuit further includes an alarm circuit, wherein:

the first end of the alarm circuit is electrically connected with the fourth end of the first main control circuit;

the alarm circuit is used for receiving the overcharge alarm information generated by the first main control circuit and generating an alarm signal according to the overcharge alarm information.

As an optional implementation manner, in the first aspect of the present utility model, the first acquisition circuit includes a first information acquisition module, a daisy chain module, and a first control module, where:

the first end of the first information acquisition module is used for being electrically connected with the first end of the target battery cell, the second end of the first information acquisition module is electrically connected with the first end of the daisy chain module, the second end of the daisy chain module is electrically connected with the first end of the first control module, and the second end of the first control module is electrically connected with the first end of the first main control circuit;

the first information acquisition module is used for acquiring the battery cell temperature of the target battery cell and acquiring the battery cell voltage of the target battery cell;

The daisy chain module is used for transmitting the cell temperature of the target cell and the cell voltage of the target cell to the first control module;

the first control module is used for generating first cell information according to the first cell voltage and the first cell temperature.

As an optional implementation manner, in the first aspect of the present utility model, the first main control circuit includes a second control module, a second information acquisition module, an isolation communication module, and a driving control module, where:

the first end of the second control module is electrically connected with the first end of the isolation communication module, the first end of the second information acquisition module is electrically connected with the second end of the isolation communication module, and the first end of the driving control module is electrically connected with the second end of the second control module;

the second information acquisition module is used for receiving the first cell information and the second cell information and transmitting the first cell information and the second cell information to the isolation communication module;

the isolation communication module is used for executing preset isolation operation on the first cell information and the second cell information so as to update the first cell information and the second cell information;

The second control module is configured to determine whether the target battery cell meets a preset overcharge condition according to the first battery cell information and the second battery cell information, obtain a determination result, determine that the target battery cell has an overcharge phenomenon when the determination result is used to indicate that the target battery cell meets the preset overcharge condition, and generate overcharge alarm information according to the first battery cell information;

and the driving control module is used for generating a target control instruction aiming at the relay according to the overcharge alarm information.

As an optional implementation manner, in the first aspect of the present utility model, the third acquisition circuit includes a third control module, a filtering module, an ADC module, and an isolation optocoupler module, where:

the first end of the filtering module is used for being electrically connected with the third end of the target battery cell, the second end of the filtering module is electrically connected with the first end of the ADC module, the second end of the ADC module is electrically connected with the first end of the isolation optocoupler module, the second end of the isolation optocoupler module is electrically connected with the first end of the third control module, and the second end of the third control module is electrically connected with the second end of the second acquisition circuit;

The filtering module is used for collecting the alternative cell temperature of the target cell and executing preset filtering operation on the alternative cell temperature so as to update the alternative cell temperature;

the ADC module is used for executing format conversion operation on the alternative cell temperature so as to update the alternative cell temperature;

the isolation optocoupler module is used for unidirectionally transmitting the temperature of the alternative battery cell to the third control module;

and the third control module is used for determining a third cell temperature of the target cell according to the alternative cell temperature.

As an optional implementation manner, in the first aspect of the present utility model, the first information collecting module includes a cell temperature detecting sub-module, a cell voltage detecting sub-module, and an equalization control sub-module, where:

the first end of the battery cell temperature detection sub-module is electrically connected with the first end of the equalization control sub-module, and the first end of the battery cell voltage detection sub-module is electrically connected with the second end of the equalization control sub-module;

the battery cell temperature detection submodule is used for acquiring the battery cell temperature of the target battery cell;

the battery cell voltage detection submodule is used for collecting the battery cell voltage of the target battery cell;

And the equalization control submodule is used for carrying out equalization charge on the target battery cell according to the battery cell temperature of the target battery cell and the battery cell voltage of the target battery cell.

As an optional implementation manner, in the first aspect of the present utility model, the third acquisition circuit further includes a multiple-way switch module, a power module, and an isolated power module, where:

the first end of the multi-way switch module is electrically connected with the third end of the filter module, the second end of the multi-way switch module is electrically connected with the third end of the ADC module, the first end of the isolation power module is electrically connected with the fourth end of the ADC module, the first end of the power module is electrically connected with the second end of the isolation power module, and the second end of the power module is electrically connected with the third end of the third control module;

the multi-path switch module is used for adjusting the oscillation frequency corresponding to the temperature of the alternative battery cell so that the oscillation frequency corresponding to the temperature of the alternative battery cell meets the preset frequency condition;

the power supply module is used for supplying power to the ADC module and the third control module;

the isolation power supply module is used for adjusting the voltage of the power supply module for supplying power to the ADC module.

The second aspect of the utility model discloses an electronic product, which comprises a shell, a battery core arranged in the shell and a circuit board, wherein the circuit board comprises the lead BMS overcharge protection circuit disclosed in any one of the first aspects.

Compared with the prior art, the embodiment of the utility model has the following beneficial effects:

the utility model provides a BMS (battery management system) overcharge protection circuit and an electronic product, wherein the circuit comprises a first acquisition circuit, a second acquisition circuit, a first main control circuit and a relay, wherein the first acquisition circuit is used for acquiring a first cell voltage and a first cell temperature of a target cell, generating first cell information and transmitting the first cell information to the first main control circuit; the second acquisition circuit is used for acquiring a second cell voltage and a second cell temperature of the target cell, generating second cell information and transmitting the second cell information to the first main control circuit; the first main control circuit is used for judging whether the target battery cell meets the preset overcharge condition according to the first battery cell information and the second battery cell information, if so, determining that the target battery cell has an overcharge phenomenon, and generating overcharge alarm information and a target control instruction of the relay; the relay is used for executing the operation matched with the target control instruction. Therefore, the utility model can improve the accuracy of judging whether the BMS overcharge phenomenon exists in the charging loop, and can cut off the charging loop in time when the overcharge exists, thereby improving the accuracy and the intelligence of the overcharge protection of the BMS, achieving the aim of overcharge protection in a battery system (such as a single battery system), and further protecting and improving the safety of the battery system.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a BMS overcharge protection circuit according to an embodiment of the present utility model;

fig. 2 is a schematic diagram illustrating a structure of another BMS overcharge protection circuit according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a first acquisition circuit according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a first master control circuit according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a third acquisition circuit according to the present disclosure;

FIG. 6 is a schematic structural diagram of a first information acquisition module according to the present disclosure;

FIG. 7 is a schematic diagram of a third acquisition circuit according to another embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of an electronic product according to an embodiment of the present utility model.

Detailed Description

For a better understanding and implementation, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, unless explicitly specified and limited otherwise, the term "electrically connected" in the description of the utility model and in the claims and in the above-mentioned figures should be understood in a broad sense, for example, as a fixed electrical connection, as a removable electrical connection, or as an integral electrical connection; can be mechanically and electrically connected or can be mutually communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. Furthermore, the terms first, second and the like in the description and in the claims of the utility model and in the foregoing figures, are used for distinguishing between different objects and not for describing a particular sequential order, and are not intended to cover any exclusive inclusion. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model discloses a BMS overcharge protection circuit which can improve the accuracy of judging whether a BMS overcharge phenomenon exists in a charging loop, and can cut off the charging loop in time when overcharge exists, so that the accuracy and the intelligence of the BMS overcharge protection are improved, the aim of overcharge protection in a battery system (such as a single battery system) is fulfilled, and the safety of the battery system is further protected and improved. The following will describe in detail.

Example 1

Referring to fig. 1, fig. 1 is a schematic diagram of a BMS overcharge protection circuit according to an embodiment of the present utility model, which can not only improve the accuracy of judging whether a BMS overcharge phenomenon exists in a charging circuit, thereby being beneficial to improving the accuracy of performing overcharge protection on the BMS, but also being beneficial to improving the intelligence of performing overcharge protection on the BMS. As shown in fig. 1, the BMS overcharge protection circuit includes a first acquisition circuit, a second acquisition circuit, a first main control circuit, and a relay, wherein:

the first end of the first acquisition circuit is used for being electrically connected with the first end of the target cell, the first end of the second acquisition circuit is used for being electrically connected with the second end of the target cell, the first end of the first main control circuit is electrically connected with the second end of the first acquisition circuit, and the second end of the first main control circuit is electrically connected with the relay;

the second acquisition circuit is used for acquiring second cell voltage and second cell temperature of the target cell, generating second cell information and transmitting the second cell information to the first main control circuit;

the first main control circuit is used for judging whether the target battery cell meets preset overcharge conditions according to the first battery cell information and the second battery cell information to obtain a judging result, determining that the target battery cell has an overcharge phenomenon when the judging result is used for indicating that the target battery cell meets the preset overcharge conditions, generating overcharge alarm information according to the first battery cell information, and generating a target control instruction for the relay according to the first battery cell information;

In the embodiment of the utility model, the target battery core is a target battery which is required to be subjected to overcharge protection detection. Optionally, the first cell voltage of the target cell collected by the first collecting circuit is a single cell voltage, the first cell temperature of the target cell collected by the first collecting circuit is a single cell temperature, the second cell voltage of the target cell collected by the second collecting circuit is a single cell voltage, and the second cell temperature of the target cell collected by the second collecting circuit is a single cell temperature.

In the embodiment of the utility model, the first cell information includes, but is not limited to, a first cell voltage and a first cell temperature; the second cell information includes, but is not limited to, a second cell voltage and a second cell temperature.

In the embodiment of the utility model, optionally, when the judging result is used for indicating that the target battery cell does not meet the preset overcharging condition, it is determined that the target battery cell does not have the overcharging phenomenon, the process can be ended, or the first acquisition circuit and the second acquisition circuit can be controlled to continuously acquire the battery cell voltage and the battery cell temperature of the target battery cell, and the first main control circuit is controlled to execute the operation of judging whether the target battery cell meets the preset overcharging condition according to the first battery cell information and the second battery cell information.

In an embodiment of the present utility model, optionally, generating a target control instruction for the relay according to the first cell information includes: and generating a target control instruction for the opening operation of the relay according to the first cell information.

In the embodiment of the present utility model, further, the relay performs an operation matched with the target control instruction to implement overcharge protection of the target battery cell, including: the relay executes the disconnection operation matched with the target control instruction so as to realize the overcharge protection of the target battery cell.

In the embodiment of the present utility model, further optionally, according to the first cell information and the second cell information, determining whether the target cell meets a preset overcharge condition, to obtain a determination result includes:

judging whether the first cell voltage is matched with the second cell voltage or not to obtain a first judgment sub-result; judging whether the first cell temperature is matched with the second cell temperature or not to obtain a second judgment sub-result; judging whether the first judgment sub-result is used for indicating that the first battery cell voltage is matched with the second battery cell voltage and the second judgment sub-result is used for indicating that the first battery cell temperature is matched with the second battery cell temperature, and judging whether the first battery cell voltage meets a preset overcharge condition and the first battery cell temperature meets the preset overcharge condition when the first judgment sub-result is used for indicating that the first battery cell voltage is matched with the second battery cell voltage and the second judgment sub-result is used for indicating that the first battery cell temperature is matched with the second battery cell temperature, so as to obtain a judgment result;

when the first judgment sub-result is used for indicating that the first battery cell voltage is not matched with the second battery cell voltage and/or the second judgment sub-result is used for indicating that the first battery cell temperature is not matched with the second battery cell temperature, judging whether the first battery cell voltage meets the preset overcharge condition or not and whether the first battery cell temperature meets the preset overcharge condition or not, and obtaining a judgment result.

It can be seen that implementing the BMS overcharge protection circuit described in fig. 1 can gather the first cell voltage and the first cell temperature of the target cell through the first acquisition circuit and generate first cell information, transmit the first cell information to the first master control circuit, and gather the second cell voltage and the second cell temperature of the target cell through the second acquisition circuit and generate second cell information, transmit the cell confidence to the first master control circuit, and judge whether the target cell meets preset overcharge conditions based on the first master control circuit according to the first cell information and the second cell information, if yes, determine that the target cell has an overcharge alarm, and generate target control instructions for the relay according to the first cell information, and control the relay to execute operations matched with the target control instructions, can be favorable to improving the accuracy and reliability of judging whether the target cell has an overcharge phenomenon based on the first cell information and the second cell information, judge whether the target cell has an overcharge phenomenon, if yes, then determine that the target cell has an overcharge alarm information exists, and generate an overcharge alarm according to the first cell information, and generate an overcharge alarm instruction according to the first cell information, and control instruction is favorable to the accuracy and the intelligent control instruction, and the intelligent control circuit can further improve the accuracy and the reliability of the overcharge protection circuit.

In an alternative embodiment, as shown in fig. 2, fig. 2 is a schematic structural diagram of another BMS overcharge protection circuit disclosed in the embodiment of the present utility model, where the BMS overcharge protection circuit further includes a second master control circuit, and the second master control circuit includes:

and the second main control circuit is used for transmitting the overcharge alarm information generated by the first main control circuit to the driving console corresponding to the target cell so that the overcharge alarm information is displayed in the display equipment of the driving console corresponding to the target cell.

In this optional embodiment, optionally, the driving console corresponding to the target battery cell may be a marine driving console, or may be a driving console corresponding to other devices, which is not limited in the embodiment of the present utility model. Optionally, the display device of the driving console corresponding to the target battery cell may be a display screen, or may be a smart phone, a smart tablet or other devices with display functions, which is not limited by the embodiment of the present utility model.

Therefore, the implementation of the alternative embodiment can transmit the overcharge alarm information generated by the first main control circuit to the driving console corresponding to the target battery cell through the second main control circuit, so that the overcharge alarm information is displayed in the display equipment of the driving console corresponding to the target battery cell, an operator of the driving console corresponding to the target battery cell can know the overcharge alarm information in real time, the comprehensiveness and timeliness of the operator of the driving console corresponding to the target battery cell in checking the overcharge alarm information can be improved, and further the operator of the driving console corresponding to the target battery cell can execute corresponding overcharge protection operation according to the overcharge alarm information, thereby being beneficial to improving timeliness and safety of overcharge protection on the BMS, and timely cutting off a charging loop when the single voltage and/or the single battery reaches an overcharge protection threshold value, and improving the safety of the battery system based on the overcharge independent protection.

In another alternative embodiment, as shown in fig. 2, the BMS overcharge protection circuit further includes a third harvesting circuit, wherein:

In this optional embodiment, the same way CAN line is used to third acquisition circuit and second acquisition circuit, and the third acquisition circuit is used for gathering the third electric core temperature of target electric core, and the second acquisition circuit CAN be used for gathering the second electric core temperature of target electric core, CAN carry out temperature determination through the third electric core temperature that the third acquisition circuit gathered and the second electric core temperature that the second acquisition circuit gathered like this, CAN improve the accuracy and the reliability of determining the temperature of target electric core, thereby CAN improve the accuracy and the reliability that judge whether the BMS exists the phenomenon of overcharging based on the electric core temperature of target electric core, and then be favorable to improving the accuracy and the security of carrying out the overcharge protection to the BMS.

In this alternative embodiment, CAN is an abbreviation for controller area network (Controller Area Network, CAN), developed by german BOSCH corporation, known as developing and manufacturing automotive electronics, and ultimately becomes the international standard (ISO 11898), one of the most widely used fieldbuses internationally. In north america and western europe, the CAN bus protocol has become the standard bus for automotive computer control systems and embedded industrial control local area networks, and has the J1939 protocol with CAN as the underlying protocol specifically designed for large trucks and heavy duty machinery vehicles.

Therefore, the implementation of the alternative embodiment CAN collect the third cell temperature of the target cell through the third collecting circuit, and the third collecting circuit and the second collecting circuit use the same CAN line, so that the temperature determination CAN be performed through the third cell temperature collected by the third collecting circuit and the second cell temperature collected by the second collecting circuit, the accuracy and the reliability of determining the temperature of the target cell CAN be improved, the accuracy and the reliability of judging whether the BMS has an overcharge phenomenon or not based on the cell temperature of the target cell CAN be improved, and the accuracy and the safety of performing overcharge protection on the BMS are further improved.

In yet another alternative embodiment, as shown in fig. 2, the BMS overcharge protection circuit further includes an alarm circuit, wherein:

and the alarm circuit is used for receiving the overcharge alarm information generated by the first main control circuit and generating an alarm signal according to the overcharge alarm information.

In this optional embodiment, optionally, the alarm signal may be one or more of a voice alarm signal, a visual alarm signal, and a light alarm signal, which is not specifically limited in the embodiment of the present utility model.

In this optional embodiment, optionally, when the alarm signal includes a voice alarm signal, the voice alarm signal is sent to a voice alarm module matched with the voice alarm signal, so that the voice alarm module sends corresponding voice alarm information according to the voice alarm signal; when the alarm signal comprises a lamplight alarm signal, the lamplight alarm signal is sent to a lamplight alarm module matched with the lamplight alarm signal, so that the lamplight alarm module sends corresponding lamplight alarm information according to the lamplight alarm signal. For example, when the alarm signal includes a voice alarm signal, the voice alarm signal is sent to the loudspeaker so that the loudspeaker carries out voice reminding according to the voice alarm information; when the alarm signal comprises a light alarm signal, the light alarm signal is sent to the alarm lamp, so that the alarm lamp carries out light reminding according to the light alarm signal.

It can be seen that implementing this alternative embodiment can receive the alarm information that fills that first main control circuit generated through alarm circuit to according to the alarm information that fills and generate alarm signal, can improve the intelligent of generating alarm signal, and can improve the accuracy and the reliability of generating alarm signal, thereby be favorable to improving the timeliness that operating personnel knows the alarm information of BMS through alarm signal, and then be favorable to improving the timeliness and the intelligent of carrying out the overcharge protection to BMS.

In yet another alternative embodiment, as shown in fig. 3, fig. 3 is a schematic structural diagram of a first acquisition circuit disclosed in an embodiment of the present utility model, where the first acquisition circuit includes a first information acquisition module, a daisy chain module, and a first control module, and where:

the first information acquisition module is used for acquiring the cell temperature of the target cell and the cell voltage of the target cell;

In this alternative embodiment, it should be noted that the second acquisition circuit is identical in structure to the first acquisition circuit.

In this optional embodiment, optionally, generating the first cell information according to the first cell voltage and the first cell temperature includes:

and determining the first cell voltage and the first cell temperature as first cell information.

In this alternative embodiment, the first control module may be an MCU control chip, or may be another chip or module with a control function, which is not limited in the embodiment of the present utility model.

In this alternative embodiment, it should be noted that the daisy chain is a form of signal transmission connection, and the daisy chain circuit mode is to use stacked cables to loop several switches into a stacked group. But the last stacked cable from top to bottom is only redundant backup, and the data packet from the first switch to the last switch is still going through all switches in the middle. In addition, in the daisy chain circuit, signals are transmitted from one device to the next device at a time in a serial mode, so that the independence and the separability of the first cell voltage and the first cell temperature in the process of being transmitted from the first information acquisition module to the first control module through the daisy chain circuit can be ensured, the mutual interference between the first cell voltage and the first cell temperature in the transmission process is reduced, and the accuracy and the reliability of the transmission of the first cell voltage and the first cell temperature can be improved.

Therefore, the implementation of the alternative embodiment can collect the battery core temperature of the target battery core and collect the battery core voltage of the target battery core through the first information collection module, the battery core temperature of the target battery core and the battery core voltage of the target battery core are transmitted to the first control module through the daisy chain module, the independence and the separability of the first battery core voltage and the first battery core temperature in the process of being transmitted from the first information collection module to the first control module through the daisy chain circuit can be ensured, the mutual interference between the first battery core voltage and the first battery core temperature in the transmission process is reduced, the accuracy and the reliability of transmitting the first battery core voltage and the first battery core temperature can be improved, the first battery core information is generated through the first control module according to the first battery core voltage and the first battery core temperature, the accuracy and the reliability of generating the first battery core information can be improved, and the accuracy and the reliability of judging whether the target battery core meets preset overcharge conditions or not according to the first battery core information and the second battery core information can be improved, and the accuracy and the reliability of being beneficial to the improvement of the accuracy and the safety of overcharge of the BMS and the safety of the battery.

In yet another alternative embodiment, as shown in fig. 4, a schematic structural diagram of a first master control circuit disclosed in the embodiment of the present utility model shown in fig. 4, where the first master control circuit includes a second control module, a second information acquisition module, an isolation communication module, and a driving control module, where:

the second control module is used for judging whether the target battery cell meets the preset overcharge condition according to the first battery cell information and the second battery cell information to obtain a judging result, determining that the target battery cell has an overcharge phenomenon when the judging result is used for indicating that the target battery cell meets the preset overcharge condition, and generating overcharge alarm information according to the first battery cell information;

and the driving control module is used for generating a target control instruction for the relay according to the overcharge alarm information.

In this optional embodiment, optionally, the manner in which the second information collecting module transmits the first battery cell information and the second battery cell information to the isolation communication module may be to transmit the first battery cell information and the second battery cell information to the isolation communication module together, so that the efficiency of transmitting the first battery cell information and the second battery cell information to the isolation communication module can be improved, thereby being beneficial to improving the efficiency of judging whether the target battery cell meets the preset overcharge condition, and further being beneficial to improving the efficiency of generating the overcharge alarm information and generating the target control instruction for the relay.

In this optional embodiment, optionally, the manner of performing the preset isolation operation on the first battery cell information and the second battery cell information may be that the received first battery cell information and the second battery cell information transmitted by the second information acquisition module are subjected to the information isolation operation, so that the first battery cell information and the second battery cell information are separated, so that information independence between the first battery cell information and the second battery cell information can be ensured, and thus accuracy and reliability of judging whether the target battery cell meets the preset overcharge condition can be improved, and further accuracy and reliability of generating the overcharge alarm information and generating the target control instruction for the relay are facilitated to be improved.

In this alternative embodiment, the target control command for the relay may alternatively include a control command to turn off the relay or a control command to turn on the relay.

Therefore, the implementation of the optional embodiment can execute the preset isolation operation on the first cell information and the second cell information through the isolation communication module so as to update the first cell information and the second cell information, and can ensure the information independence between the first cell information and the second cell information, thereby being capable of improving the accuracy and the reliability of judging whether the target cell meets the preset overcharge condition or not, and further being beneficial to improving the accuracy and the reliability of generating the overcharge alarm information and generating the target control instruction for the relay; and whether the target battery cell meets the preset overcharge condition can be judged by the second control module based on the first battery cell information and the second battery cell information, so that the accuracy and reliability of a judgment result can be improved, and further the accuracy and reliability of generating overcharge alarm information and generating a target control instruction for the relay are improved.

In yet another alternative embodiment, as shown in fig. 5, fig. 5 is a schematic structural diagram of a third acquisition circuit disclosed in an embodiment of the present utility model, where the third acquisition circuit includes a third control module, a filtering module, an ADC module, and an isolation optocoupler module, where:

and the third control module is used for determining the third cell temperature of the target cell according to the alternative cell temperature.

In this optional embodiment, optionally, the filtering module performs a preset filtering operation on the candidate cell temperature, including: one or more of mean filtering operation, gaussian filtering operation, median filtering operation, bilateral filtering operation. Therefore, the alternative cell temperature of the target cell can be acquired through the filtering module, and the preset filtering operation is performed on the alternative cell temperature to update the alternative cell temperature, so that the intelligence of processing the alternative cell temperature can be improved, the alternative cell temperature is prevented from being interfered by noise signals, the alternative cell temperature is caused to have errors, and the accuracy of obtaining the alternative cell temperature is improved.

In this alternative embodiment, optionally, the ADC module is an ADC circuit, which is a digital-to-analog conversion circuit, i.e. the ADC circuit is capable of converting an analog signal into a digital signal. Further, the ADC module is capable of converting the alternative cell temperature into a digital form that is easier to store, process, transmit, and update the data format of the alternative cell temperature. Thus, format conversion operation can be performed on the alternative cell temperature through the ADC circuit to update the data format of the alternative cell temperature, the data format of the alternative cell temperature can be unified, the efficiency and accuracy of processing the alternative cell temperature can be improved, the accuracy and reliability of determining the third cell temperature of the target cell according to the alternative cell temperature can be improved, and the efficiency of determining the third cell temperature of the target cell according to the alternative cell temperature can be improved.

In this alternative embodiment, optionally, determining the third cell temperature of the target cell according to the alternative cell temperature includes:

and determining the alternative cell temperature as a third cell temperature of the target cell.

Therefore, the alternative embodiment can acquire the alternative cell temperature of the target cell through the filtering module, perform the preset filtering operation on the alternative cell temperature to update the alternative cell temperature, improve the intelligence of processing the alternative cell temperature, and prevent the alternative cell temperature from being interfered by noise signals so that errors occur in the alternative cell temperature, thereby being beneficial to improving the accuracy of obtaining the alternative cell temperature; the format conversion operation can be performed on the alternative cell temperature through the ADC module to update the alternative cell temperature, the format conversion operation can be performed on the alternative cell temperature through the ADC circuit to update the data format of the alternative cell temperature, the data format of the alternative cell temperature can be unified, the efficiency and the accuracy of processing the alternative cell temperature can be improved, the accuracy and the reliability of the third cell temperature of the target cell can be improved, and the efficiency of the third cell temperature of the target cell can be improved; the alternative cell temperature can be unidirectionally transmitted to the third control module through the isolation optocoupler module, unidirectional transmission of the alternative cell temperature can be ensured, and interference of other data can be avoided in the transmission process of the alternative cell temperature, so that the accuracy and reliability of the alternative cell temperature transmission can be improved, the accuracy and reliability of determining the third cell temperature of the target cell can be improved, and the intelligence of determining the third cell temperature can be improved.

In yet another alternative embodiment, as shown in fig. 6, fig. 6 is a schematic structural diagram of a first information collecting module disclosed in an embodiment of the present utility model, where the first information collecting module includes a cell temperature detecting sub-module, a cell voltage detecting sub-module, and an equalization control sub-module, where:

the battery cell temperature detection sub-module is used for acquiring the battery cell temperature of the target battery cell;

the battery cell voltage detection sub-module is used for collecting the battery cell voltage of the target battery cell;

and the equalization control sub-module is used for equalizing charge of the target battery cell according to the battery cell temperature of the target battery cell and the battery cell voltage of the target battery cell.

In this optional embodiment, optionally, the equalizing control submodule performs equalizing charge on the target cell according to the cell temperature of the target cell and the cell voltage of the target cell, including: and determining the equalizing charge parameter of the target battery cell according to the battery cell temperature of the target battery cell and the battery cell voltage of the target battery cell, and equalizing charge is carried out on the target battery cell according to the equalizing charge parameter. Therefore, unbalanced voltage at the battery terminal caused by individual difference, temperature difference and the like of the battery in the use process of the target battery core can be avoided, and the characteristics of each battery monomer in the battery pack can be balanced so as to prolong the service life of the battery.

Therefore, the implementation of the alternative embodiment can acquire the cell temperature of the target cell through the cell temperature detection sub-module and acquire the cell voltage of the target cell through the cell voltage detection sub-module, can acquire the cell temperature of the target cell and acquire the cell voltage of the target cell respectively, can ensure the independence of the acquired cell temperature and the cell voltage, and further improve the accuracy and reliability of the acquired cell temperature and the cell voltage; and carry out equalizing charge to the target electric core according to the electric core temperature of target electric core and the electric core voltage of target electric core through equalizing control submodule, can avoid causing battery terminal voltage unbalance because of reasons such as the individual difference of battery, temperature difference in the use at the target electric core, can reach each battery monomer characteristic in the balanced group battery in order to prolong the life of battery, thereby be favorable to improving the intelligence that protects BMS and be favorable to improving the accuracy and the reliability that carry out the overcharge protection to BMS, and then be favorable to improving the life of extension target electric core, and improve the user and use target electric core and BMS overcharge protection circuit's use experience sense.

In yet another alternative embodiment, as shown in fig. 7, fig. 7 is a schematic structural diagram of another third acquisition circuit disclosed in the embodiment of the present utility model, where the third acquisition circuit further includes a multiple switch module, a power module, and an isolated power module, where:

the multi-path switch module is used for adjusting the oscillation frequency corresponding to the temperature of the alternative battery cell so as to enable the oscillation frequency corresponding to the temperature of the alternative battery cell to meet a preset frequency condition;

and the isolation power supply module is used for adjusting the voltage of the power supply module for supplying power to the ADC module.

In this optional embodiment, optionally, the multiple switching module may be a multiple switching circuit, or may be another circuit or module capable of adjusting the oscillation frequency, which is not specifically limited in the embodiment of the present utility model; the multipath switch module is an oscillating circuit formed by an inductor and a capacitor, and can discontinuously change the inductance to change the natural frequency range of the oscillating circuit, thereby changing the receiving wave band. Therefore, the oscillating frequency corresponding to the temperature of the alternative battery cell is adjusted through the multi-way switch module, so that the oscillating frequency corresponding to the temperature of the alternative battery cell meets the preset frequency condition, the running stability of the third acquisition circuit can be ensured, and the accuracy and reliability of the third acquisition circuit for determining the temperature of the third battery cell of the target battery cell can be ensured.

Therefore, in the implementation of the alternative embodiment, the oscillation frequency corresponding to the alternative cell temperature can be adjusted through the multi-way switch module so that the oscillation frequency corresponding to the alternative cell temperature meets the preset frequency condition, the oscillation frequency corresponding to the alternative cell temperature can be adjusted so that the oscillation frequency corresponding to the alternative cell temperature meets the preset frequency condition, the stability of the operation of the third acquisition circuit can be ensured, and the accuracy and the reliability of the third acquisition circuit for determining the third cell temperature of the target cell can be ensured; the ADC module and the third control module are powered through the power module, so that the stability of power supply to the ADC module and the third control module can be ensured, and the running stability of the BMS overcharge protection circuit can be improved; and adjust the voltage that power module supplied power to ADC module through keeping apart power module, can prevent that power module from carrying out overcharge to ADC module, be favorable to guaranteeing security and the stability of supplying power to ADC module.

Example two

Referring to fig. 8, fig. 8 is a schematic structural diagram of an electronic product according to an embodiment of the present utility model, wherein the electronic product includes a BMS overcharge protection circuit according to any one of the first embodiment. And the detection function that this electronic product can realize includes but is not limited to can improve the accuracy that judges whether there is BMS overcharge phenomenon in the circuit that charges, when there is the overcharge, can in time cut off the circuit that charges, improves accuracy and the intelligence that carries out overcharge protection to BMS to reach overcharge protection purpose in battery system (like monomer battery system), and then protect the security that improves battery system. It should be noted that, for the detailed description of the BMS overcharge protection circuit, please refer to the detailed description of the related content in the first embodiment, and the detailed description is omitted.

Therefore, implementing the electronic product described in fig. 8 can improve the accuracy of judging whether the overcharge phenomenon of the BMS exists in the charging circuit, and when the overcharge exists, the charging circuit can be cut off in time, so that the accuracy and the intelligence of the overcharge protection of the BMS are improved, the aim of overcharge protection in a battery system (such as a single battery system) is achieved, and the safety of the battery system is further improved.

The foregoing describes in detail a BMS overcharge protection circuit and an electronic product disclosed in the embodiments of the present utility model, and specific embodiments are applied herein to illustrate the principles and implementation of the present utility model, but the foregoing preferred embodiments are not intended to limit the present utility model, and the foregoing description of the embodiments is only for helping to understand the method and core idea of the present utility model; also, it will be apparent to those skilled in the art from this disclosure that various modifications can be made in the specific embodiments and applications without departing from the spirit and scope of the utility model, and the scope of the utility model is therefore defined in the appended claims.

Claims

1. BMS overcharge protection circuit, its characterized in that, BMS overcharge protection circuit includes first acquisition circuit, second acquisition circuit, first master control circuit, relay, wherein:

2. The BMS overcharge protection circuit of claim 1, further comprising a second master circuit, wherein:

3. The BMS overcharge protection circuit of claim 2, further comprising a third harvesting circuit, wherein:

4. The BMS overcharge protection circuit of claim 3, further comprising an alarm circuit, wherein:

5. The BMS overcharge protection circuit of claim 4 wherein said first acquisition circuit comprises a first information acquisition module, a daisy-chain module, a first control module, wherein:

6. The BMS overcharge protection circuit of claim 5, wherein the first master control circuit comprises a second control module, a second information acquisition module, an isolation communication module, a drive control module, wherein:

7. The BMS overcharge protection circuit of claim 6, wherein the third acquisition circuit comprises a third control module, a filter module, an ADC module, an isolation optocoupler module, wherein:

8. The BMS overcharge protection circuit of claim 5, wherein the first information acquisition module comprises a cell temperature detection sub-module, a cell voltage detection sub-module, and an equalization control sub-module, wherein:

9. The BMS overcharge protection circuit of claim 7, wherein the third harvesting circuit further comprises a multi-way switch module, a power module, an isolated power module, wherein:

10. An electronic product comprising a housing, a battery cell arranged in the housing, and a circuit board, wherein the circuit board comprises the BMS overcharge protection circuit of any one of claims 1-9.