WO2023024580A1

WO2023024580A1 - Battery monitoring apparatus and battery apparatus

Info

Publication number: WO2023024580A1
Application number: PCT/CN2022/092226
Authority: WO
Inventors: 余爱水; 艾超; 曹华俊; 汤剑涛
Original assignee: 华为技术有限公司
Priority date: 2021-08-27
Filing date: 2022-05-11
Publication date: 2023-03-02
Also published as: CN115911620A

Abstract

A battery monitoring apparatus and a battery apparatus. The battery apparatus comprises a plurality of cells, a housing, and a battery monitoring apparatus. The cells and the battery monitoring apparatus are both accommodated within the housing. The battery monitoring apparatus is used to monitor the state of the cells. The battery monitoring apparatus comprises a plurality of sensors and a processor. The plurality of sensors are used to sense a plurality of parameters of the cells, and the processor is used to determine state information of the cells according to the plurality of parameters and to report the state information to an external apparatus by means of a first processing line and a second processing line. By integrating the plurality of sensors into the battery apparatus, the real-time monitoring of battery state is effectively implemented under limited impact on the electrochemical performance of a battery.

Description

Battery monitoring device and battery device

Cross References to Related Applications

This application claims the priority of a Chinese patent with application number 202110998017.0 and application title "Battery Monitoring Device and Battery Device" filed with the China Patent Office on August 27, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of batteries, in particular to a battery monitoring device and a battery device.

Background technique

With the development of lithium-ion battery technology, lithium-ion batteries have been widely used in fields such as electric vehicles and electronic products.

Lithium-ion batteries are prone to failure due to overheating, over-discharge, over-charging or short-circuit, and the chemical energy of lithium-ion batteries can be quickly converted into thermal energy, which can easily lead to heat accumulation inside the lithium-ion battery, causing thermal runaway, which will eventually lead to Hazardous situations such as fire and explosion occur. For example, the consequences of thermal runaway of the power battery pack of an electric vehicle are very serious, and often lead to safety accidents such as car crashes and fatalities. Therefore, it is of great significance to monitor the battery status in real time.

Contents of the invention

The present application provides a battery monitoring device and a battery device, which can conveniently realize real-time monitoring of the battery state under the condition of limited influence on the discharge capacity and capacity retention rate of the battery.

In the first aspect, the embodiment of the present application provides a battery monitoring device, which is used to monitor the state of the cells in the battery device, and the battery monitoring device includes a plurality of sensors, a processor and a processing circuit; the plurality of sensors are used for Sensing various parameters of the electric core; the processor is electrically connected to the multiple sensors, and is used to receive the various parameters, so as to determine the state information of the electric core according to the various parameters; the The processing circuit is electrically connected to the processor, and the processing circuit includes a first processing circuit and a second processing circuit, and both the first processing circuit and the second processing circuit are used to report the status information of the battery cell to an external device.

By adopting the embodiments of the present application, the real-time monitoring of the battery state can be effectively realized under the condition of limited influence on the electrochemical performance of the battery, and the problems existing in the battery cell can be accurately warned. The technical solution of the embodiment of the present application increases the safety and reliability of the battery, and can quickly give feedback and give an alarm before the battery becomes abnormal, so as to protect the life safety of the user.

In a possible design, the first processing line is led out from a first lead-out port on the battery device, and the second processing line is led out together with the negative port of the battery device. Based on such a design, the first processing circuit and the second processing circuit can report the status information of the battery cell to an external device.

In a possible design, both the first processing line and the second processing line are led out from a coaxial connector on the battery device. Based on such a design, the first processing circuit and the second processing circuit can report the status information of the battery cell to an external device.

In a possible design, the first processing circuit is derived from a second outlet port on the battery device, and the second processing circuit is derived from a third outlet port on the battery device. Based on such a design, the first processing circuit and the second processing circuit can report the status information of the battery cell to an external device.

In a possible design, the multiple sensors include at least one of a temperature sensor, a pressure sensor, a voltage sensor, a current sensor, a pressure sensor, or a gas sensor.

In the second aspect, an embodiment of the present application provides a battery device, which includes a plurality of battery cells, a casing, and the battery monitoring device as described above, wherein the battery cells and the battery monitoring device accommodate within the housing.

By adopting the embodiment of the present application, by embedding the battery monitoring device inside the battery device, it is possible to sensitively monitor parameters such as temperature, stress and air pressure inside the battery with limited influence on the discharge capacity and capacity retention rate of the battery, and to Quickly output these signals to external devices, so that real-time monitoring of the battery status can be realized, and the batteries with problems can be accurately notified. In addition, the technical solution of the embodiment of the present application increases the safety and reliability of the battery, and can quickly feedback and give an alarm when the battery is abnormal, so as to protect the life safety of the user.

In a possible design, the battery cell includes a plurality of sequentially stacked negative pole pieces, separators and positive pole pieces, and the battery monitoring device is arranged on the last negative pole piece of the battery cell.

In a possible design, the battery monitoring device is arranged between two battery cells. Based on such a design, the battery monitoring device can monitor the state of the battery cells.

In a possible design, the battery monitoring device is arranged between the battery cell and the housing. Based on such a design, the battery monitoring device can monitor the state of the battery cells.

In a possible design, the housing includes a cover plate, and a positive port, a negative port, and a safety valve are arranged on the cover plate, and the safety valve is located between the positive port and the negative port, the The safety valve is used to discharge the gas in the battery device.

In a possible design, the cover plate is also provided with a first lead-out port, the first processing line of the battery monitoring device is led out from a first lead-out port on the battery device, and the second line processing line Lead out together with the negative terminal of the battery unit. Based on such a design, the first processing circuit and the second processing circuit can report the status information of the battery cell to an external device.

In a possible design, a coaxial connector is further provided on the cover, and both the first processing circuit and the second processing circuit of the battery monitoring device are led out from the coaxial connector.

In a possible design, the cover plate is further provided with a second outlet port and a third outlet port, the first processing circuit is led out from the second outlet port, and the second processing circuit is exported from the The third lead-out port is exported. Based on such a design, the first processing circuit and the second processing circuit can report the status information of the battery cell to an external device.

Using the battery monitoring device and battery device in the embodiment of the present application, by embedding the battery monitoring device inside the battery device, it is possible to sensitively monitor the temperature, stress and air pressure inside the battery with limited influence on the electrochemical performance of the battery parameters, and can quickly output these signals to external devices, so that real-time monitoring of the state of the battery can be realized, and the problem of the battery can be accurately warned. The technical solution of the embodiment of the present application increases the safety and reliability of the battery, and can quickly give feedback and give an alarm before the battery becomes abnormal, so as to protect the life safety of the user.

Description of drawings

FIG. 1 is a schematic diagram of a battery device according to an embodiment of the present application.

FIG. 2 is another schematic diagram of the battery device of the embodiment of the present application.

Fig. 3 is a diagram of a specific application scenario of the battery device according to the embodiment of the present application.

Fig. 4 is another specific application scenario diagram of the battery device according to the embodiment of the present application.

FIG. 5 is a schematic structural diagram of a battery monitoring device according to an embodiment of the present application.

Fig. 6 is a diagram of a specific application scenario of the battery monitoring device according to the embodiment of the present application.

FIG. 7 is another specific application scenario diagram of the battery monitoring device according to the embodiment of the present application.

FIG. 8 is another specific application scenario diagram of the battery monitoring device according to the embodiment of the present application.

FIG. 9 is another specific application scenario diagram of the battery monitoring device according to the embodiment of the present application.

Fig. 10 is a schematic diagram of the line output of the battery monitoring device according to the embodiment of the present application.

Fig. 11 is another schematic diagram of the line output of the battery monitoring device according to the embodiment of the present application.

Fig. 12 is another schematic diagram of the line output of the battery monitoring device according to the embodiment of the present application.

FIG. 13 is another schematic diagram of the line output of the battery monitoring device according to the embodiment of the present application.

Fig. 14 is another schematic diagram of the line output of the battery monitoring device according to the embodiment of the present application.

Fig. 15 is another schematic diagram of the line output of the battery monitoring device according to the embodiment of the present application.

Fig. 16 is a schematic diagram of the placement of the battery monitoring device and the welding of tabs according to the embodiment of the present application.

Fig. 17 is a schematic diagram of welding of tabs and connecting pieces of the battery device according to the embodiment of the present application.

FIG. 18 is a schematic diagram of welding the pole connecting piece and the pole of the battery device according to the embodiment of the present application.

Fig. 19 is a schematic diagram of welding the pole assembly into the case and the cover plate and the case according to the embodiment of the present application.

FIG. 20 is a schematic diagram of the line output and the cover plate of the battery device according to the embodiment of the present application.

FIG. 21 is another schematic diagram of the line output and the cover plate of the battery device according to the embodiment of the present application.

FIG. 22 is another schematic diagram of the line output and the cover plate of the battery device according to the embodiment of the present application.

Description of main component symbols

100-battery device; 200-external device; 210-external communication unit; 220-external control unit; 230-application unit; 300-notebook computer; 400-electric vehicle; 10-battery monitoring device; 12-temperature sensor; 13- Pressure sensor; 14-voltage sensor; 15-current sensor; 16-air pressure sensor; 20-cell; 201-negative pole piece; 202-diaphragm; 203-positive pole piece; 211-positive pole ear; ; 213-positive connecting piece; 214-negative connecting piece; 30-housing; 31-cover; -coaxial connector; 321-positive pole; 322-negative pole; 40-processor; 41-data interface; 42-control unit; 44-communication processing unit; 45-data processing unit; 46-action execution unit; 417-the first processing circuit; 418-the second processing circuit; 50-pole group;

The following specific embodiments will further describe the present application in detail in conjunction with the above-mentioned drawings.

Detailed ways

It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intervening element at the same time. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements may also be present.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Thermal runaway can refer to an overheating phenomenon in which the temperature of the battery rises sharply due to a series of exothermic chain reactions inside the battery, and the temperature is no longer controllable, which can lead to dangerous situations such as fire, explosion, and combustion of the battery. Therefore, how to accurately and effectively predict thermal runaway before the battery pack catches fire will be of great significance to ensure the safety of the battery.

In a possible implementation, when the pouch battery is stacked, a Bragg optical fiber temperature sensor can be embedded between the diaphragm and the diaphragm inside the pouch battery to monitor the change of the internal temperature of the battery, and the pouch battery A Bragg fiber optic temperature sensor is attached to the outer surface of the pouch battery. It can be understood that the Bragg fiber optic temperature sensor can monitor the temperature inside and outside the pouch battery. However, in the above method, the various performances of the battery will drop sharply, such as the discharge capacity and cycle stability of the battery will all decrease. In addition, the internal state of the battery cannot be understood and mastered, and the internal state of the battery cannot be effectively monitored and monitored. manage.

In another possible implementation, the lithium-ion battery can include 8 pieces of graphite anode with a capacity of 330mAh/g, 7 pieces of nickel-manganese-cobalt (NMC) with a capacity of 150mAh/g, and lithium hexafluorophosphate (LiPF ₆ ). electrolyte, the battery capacity thus assembled was 5Ah. Eight distributed Bragg optical fiber temperature sensors can be bonded to the surface of the pouch battery with epoxy glue, and the eight sensors can be further bonded with insulating tape, so that the device can monitor the temperature change on the outer surface of the pouch battery. However, in the above method, the aluminum-plastic film of the outer packaging has a heat insulation effect, that is, the Bragg optical fiber temperature sensor cannot monitor the temperature change inside the battery in time. Therefore, the above implementation method cannot accurately monitor the safety of the battery and is not practical. high.

In another possible implementation, the anode material, binder, and conductive agent can be mixed and coated on the copper foil anode current collector, and then the Bragg fiber optic temperature sensor (placed in a custom-made tube) is embedded in the slurry, and dry the pole pieces in a vacuum oven. After the pole piece is dried, the Bragg fiber optic temperature sensor can be fixed on the pole piece, and the signal of the Bragg fiber optic temperature sensor is output through the fiber optic line, and the fiber optic line is led out from the middle of the tail of the pouch battery. In addition, in order to prevent the optical fiber line from being corroded by the electrolyte, a layer of polyimide polymer can be coated on its surface. It can be understood that the above-mentioned implementation method can monitor the temperature change inside the battery in time, but the position where the sensor is embedded will reduce the capacity of the battery and also reduce the cycle performance of the battery. In addition, there will be certain challenges to the packaging technology of pouch batteries. If the packaging technology is not good, it will easily lead to the leakage of battery electrolyte.

In view of the above problems, the embodiments of the present application provide a battery monitoring device and a battery device. The sensor can be integrated into the battery, and the battery can be monitored under the condition of limited influence on the discharge capacity and capacity retention rate of the battery. Real-time monitoring of core status, and can quickly output the sensed signal. The battery may include one or more cells, and multiple cells will be used as an example for introduction later.

Please refer to FIG. 1 , which is a schematic diagram of a battery device 100 provided by an embodiment of the present application. The battery device 100 can be electrically connected to an external device 200 . In a possible scenario, the battery device 100 may provide power for the external device 200 . In another possible scenario, the battery device 100 may also output battery status information to the external device 200 .

The battery device 100 in this embodiment may include a battery monitoring device 10 and a battery cell 20 . The battery monitoring device 10 in this embodiment can monitor the status of the battery cell 20 and report the monitored status of the battery cell 20 to the external device 200 . For example, the battery monitoring device 10 may transmit the health status or thermal runaway status of the battery device 100 to the external device 200 .

In a possible scenario, if thermal runaway occurs in the battery device 100, the battery monitoring device 10 may report the thermal runaway information of the battery device 100 to the external device 200, and the external device 200 may send an alarm message , to remind the user to deal with it in time. In another possible scenario, if the battery device 100 is in a healthy state, the battery monitoring device 10 may report the health state information of the battery device 100 to the external device 200, and the external device 200 may issue a prompt Information, that is, the battery device 100 is in a safe state at this time.

It can be understood that the battery device 100 can be applied to mobile terminals, notebook computers, electric vehicles, energy storage systems, underwater battery drive devices, etc., which is not limited in this application.

Please refer to FIG. 2 , which is a schematic structural diagram of a battery device 100 according to an embodiment of the present application. It can be understood that, in a possible implementation manner, the battery device 100 may be a prismatic battery. Specifically, the battery device 100 may further include a casing 30 , and both the battery monitoring device 10 and the battery cell 20 may be accommodated in the casing 30 . The casing 30 may include a cover plate 31 on which a positive port 311 , a negative port 312 , a safety valve 313 , a liquid injection hole 314 and an outlet port 315 may be disposed.

It can be understood that the safety valve 313 in this embodiment can discharge the gas in the battery device 100 . Furthermore, the liquid injection hole 314 can be used for injecting electrolyte solution into the battery device 100 . The outgoing port 315 can be used to connect the line of the battery monitoring device 10 with the external device 200 .

It can be understood that the positive terminal 311 can be used to electrically connect the positive tab of the battery 20 , and the negative terminal 312 can be used to electrically connect the negative tab of the battery 20 .

As shown in FIG. 3 , in a usage scenario, the battery device 100 is applied to a notebook computer 300 as an example for description.

In some embodiments, the battery device 100 may be disposed inside the notebook computer 300. It can be understood that the battery device 100 can be used to provide power for the notebook computer 300, and the battery monitoring device 10 can also report the state information of the monitored batteries to the notebook computer 300, so as to provide power for the battery device 300. When the thermal runaway of the battery device 100 occurs, the user can be reminded to deal with it in time, and a prompt message can also be sent to the user when the battery device 100 is in a healthy state.

For example, if thermal runaway occurs in the battery device 100, the battery monitoring device 10 may transmit thermal runaway information to the notebook computer 300, the display screen of the notebook computer 300 may display an alarm message, and the notebook computer The loudspeaker of 300 can emit an alarm sound to inform the user that the battery device 100 is in a state of thermal runaway at this time, and the situation needs to be dealt with in time. If the battery device 100 is in a safe state, the battery monitoring device 10 can transmit the health status information to the notebook computer 300, and the display screen of the notebook computer 300 can display the battery safety information to inform the user of the current state of the battery. The device 100 is in a safe state.

As shown in FIG. 4 , in another usage scenario, the battery device 100 is applied to an electric vehicle 400 as an example for description.

The battery device 100 may be disposed inside the electric vehicle 400 . The battery device 100 can be a vehicle battery pack, that is, the battery device 100 can be used to provide power for the electric vehicle 400, and the battery monitoring device 10 can report the monitored battery status information to the electric vehicle 400 , so that when thermal runaway occurs in the battery device 100, the vehicle-mounted display screen of the electric vehicle 400 displays warning information to remind the user to deal with it in time, and the vehicle-mounted display screen of the electric vehicle 400 can also , to display the health status of the battery device 100 .

Referring to FIG. 5 , the battery monitoring device 10 provided in the embodiment of the present application will be described below with reference to the accompanying drawings and actual application scenarios.

FIG. 5 is a schematic structural diagram of a battery monitoring device 10 provided by an embodiment of the present application. In this embodiment, the battery monitoring device 10 may include multiple sensors and a processor 40 .

For example, the plurality of sensors may include a temperature sensor 12, a pressure sensor 13, a voltage sensor 14, a current sensor 15, and an air pressure sensor 16, a gas sensor (not shown in the figure), and other types of sensors. It can be understood that the aforementioned sensors can all be used to sense parameters of the battery cell 20 . Wherein, the processor 40 in this embodiment may include a data interface 41 , a control unit 42 , a communication processing unit 44 , a data processing unit 45 and an action execution unit 46 .

It can be understood that the processor 40 can communicate with the above-mentioned sensors, and can receive the parameters of the battery cell 20 sensed by multiple sensors, and the processor 40 can determine the parameters based on the various parameters sensed by the multiple sensors. Describe the state of the battery cell 20.

The data interface 41 can be electrically connected to the plurality of sensors, that is, the data interface 41 can be electrically connected to the temperature sensor 12, the pressure sensor 13, the voltage sensor 14, the current sensor 15, the air pressure sensor 16, the gas sensor and other types of sensors . The data interface 41 can convert the transmission signals between multiple sensors and the control unit 42, and the data interface 41 can also be used to complete receiving and sending between the multiple sensors and the control unit 42, etc. transfer function, etc.

In this embodiment, the control unit 42 may be the main control module of the processor 40, and the control unit 42 may be electrically connected to the temperature sensor 12, the pressure sensor 13, the air pressure sensor 16, and the gas sensor. and other types of sensors. Wherein, the control unit 42 can control the temperature sensor 12 to collect the temperature signal of the battery cell 20, the control unit 42 can also control the pressure sensor 13 to collect the pressure signal of the battery cell 20, the control The unit 42 can also control the air pressure sensor 16 (such as a gas sensor) to collect the air pressure parameters of the battery cell 20 . It can be understood that the temperature signal and the pressure signal collected by the temperature sensor 12 and the pressure sensor 13 are all analog signals, therefore, the control unit 42 can simulate the temperature signal and the pressure signal through the data interface 41 digital conversion, so as to transmit the converted digital signal to the data processing unit 45.

The control unit 42 can also be electrically connected to the voltage sensor 14 and the current sensor 15 . Wherein, the control unit 42 can also control the voltage sensor 14 to collect the voltage value of the battery cell 20 , and the control unit 42 can also control the current sensor 15 to collect the current value of the battery cell 20 . It can be understood that the voltage signal and the current signal collected by the voltage sensor 14 and the current sensor 15 are all analog signals, therefore, the control unit 42 can also carry out the voltage signal and the current signal through the data interface 41 Analog-to-digital conversion, so as to transmit the converted digital signal to the data processing unit 45 .

It can be understood that in this embodiment, the data processing unit 45 may be used to process and analyze the parameters of the multiple sensors. In this manner, the data processing unit 45 can perform analysis and processing based on the relevant parameters collected by the above-mentioned multiple sensors, thereby further determining the state of the battery cell 20 . The communication processing unit 44 can be electrically connected to the external device 200 . Thus, after the data processing unit 45 determines the state of the battery cell 20 , it can send it to the external device 200 through the communication processing unit 44 , and then feed it back to the external device 200 (such as an on-board chip). It can be understood that, in a possible implementation manner, the communication processing unit 44 may transmit information to the external device 200 in a manner of wired communication or wireless communication.

In a possible design, the data processing unit 45 may include a micro control unit (Micro Control Unit, MCU) core, wherein the MCU core may be used for data processing. The data processing unit 45 can also be used to optimize the control algorithm. It can be understood that the processor 40 in this embodiment can also include a clock unit and a power supply unit. Wherein, the clock unit may be used to control the clock of the processor 40 . The power supply unit can be used to provide power and power management for various units in the processor 40 .

In this embodiment, the action execution unit 46 may be electrically connected to the control unit 42 , and the action execution unit 46 may be configured to execute control instructions from the control unit 42 . It can be understood that, in some possible designs, the action execution unit 46 can be a protection device for the battery device 100, and the action execution unit 46 can be used to cut off the battery output, cut off the battery input (such as overshoot protection), Temperature rise protection, low temperature protection and overload protection, etc.

In a possible implementation manner, the temperature sensor 12 , pressure sensor 13 , air pressure sensor 16 , gas sensor and other types of sensors can all be arranged on different surfaces of the battery cell 20 .

Based on the above design, the embodiment of the present application can design a multi-channel parameter acquisition scheme, and after the analysis and processing by the data processing unit 45, the calculation result can be sent to the on-board chip through the communication processing unit 44. Therefore, the embodiment of the present application can realize high-speed and real-time transmission of signals, and can integrate multiple sensors into the battery monitoring device. In addition, it can also be displayed in real time on the large screen of the vehicle, and an alarm prompt can be issued in case of danger, so as to realize real-time monitoring of the battery status.

Please refer to FIG. 6 , which is a diagram of a specific application scenario of the battery monitoring device 10 according to an embodiment of the present application. As shown in FIG. 6 , in this embodiment, the cell 20 may include a negative pole piece 201 , a separator 202 or a solid electrolyte and a positive pole piece 203 stacked in sequence.

It can be understood that, in a possible implementation manner, the battery monitoring device 10 can be embedded in the battery cell 20, and in a specific implementation process, the battery monitoring device 10 can be embedded in the last of the battery cell 20 On a piece of negative electrode sheet 201 (for example, on the current collector side). Based on such a design, the battery monitoring device 10 can monitor the state of the battery cell 20, for example, the battery monitoring device 10 can obtain various parameters of the battery cell 20, and the battery monitoring device 10 can also be based on A variety of parameters are obtained to determine the state of the battery cell 20 . Among them, various parameters may include the temperature, pressure and air pressure, voltage and current of the battery core.

It can be understood that the state of the battery cell 20 may affect the working state of the entire battery device 100 . In a possible situation, one of the battery cells 20 has thermal runaway or is about to experience thermal runaway. If it cannot be detected and controlled in time, thermal diffusion may occur in the battery cell 20, causing the entire battery device 100 to burn or even explode. . For this reason, in the embodiment of the present application, a corresponding battery monitoring device 10 can be configured on the last negative electrode sheet 201 of each battery cell 20, so that thermal runaway can occur or will occur in one or more battery cells 20. When the battery device 100 burns and explodes, it can be detected and controlled in time to avoid dangerous situations such as combustion and explosion of the battery device 100.

The battery monitoring device 10 can send the monitored status information of the battery cell 20 to the external device 200 . The external device 200 can obtain thermal runaway information or health status information for one or more battery cells, so as to give an early warning for the one or more battery cells 20 .

Please refer to FIG. 7 , which is another specific application scenario diagram of the battery monitoring device 10 according to the embodiment of the present application. As shown in FIG. 7 , in this embodiment, the battery device 100 may include a plurality of battery cells 20 . The battery monitoring device 10 can be disposed between two battery cells 20 .

Based on such a design, the battery monitoring device 10 can monitor the parameters of the battery cell 20 and determine the state of the battery cell 20 according to the monitored parameters.

It can be understood that in another possible scenario, that is, when the designed capacity of the battery device 100 is relatively large, multiple battery monitoring devices 10 may be provided. As shown in FIG. 8 , the battery device 100 is described by taking five battery cells 20 as an example. In other scenarios, the number of battery cells 20 can be adjusted according to actual conditions.

For example, in the scenario shown in FIG. 8 , five battery cells 20 may be arranged in the casing 30 in sequence and side by side. Exemplarily, a battery monitoring device 10 may be provided between the first battery cell 20 and the second battery cell 20, and no battery monitoring device 10 is provided between the second battery cell 20 and the third battery cell 20. The battery monitoring device 10 is not provided between the three battery cells 20 and the fourth battery cell 20 , and the battery monitoring device 10 is provided between the fourth battery cell 20 and the fifth battery cell 20 . It can be understood that the placement of the battery monitoring device 10 in the above scenario is only an example.

Please refer to FIG. 9 , which is another specific application scenario diagram of the battery monitoring device 10 according to the embodiment of the present application. As shown in FIG. 9 , in this embodiment, the battery monitoring device 10 may be disposed between the battery cell 20 and the casing 30 . Based on the various placement positions of the battery monitoring device 10 described above, the battery monitoring device 10 can conveniently realize real-time monitoring of the state of the battery device 100 under the condition of limited influence on the electrochemical performance of the battery.

Please refer to FIG. 10 , which is a schematic structural diagram of the line output of the battery monitoring device 10 provided by an embodiment of the present application. The battery monitoring device 10 may include processing circuitry, wherein the processing circuitry may be electrically connected to the processor 40 . Specifically in the implementation manner of the present application, the processing circuit may include a first processing circuit 417 and a second processing circuit 418 . The first processing circuit 417 and the second processing circuit 418 may be electrically connected to the processor 40, for obtaining the status information of the battery device 100 from the processor 40, and converting the obtained The status information is reported to the external device 200 .

It can be understood that the first processing circuit 417 and the second processing circuit 418 may be electrically connected to the external device 200 . The external device 200 can further know the state of the battery device 100 according to the received state information of the battery device 100 .

In some possible implementation manners, the external device 200 may include an external communication unit 210 , an external control unit 220 and an application unit 230 .

The external communication unit 210 can be electrically connected to the battery monitoring device 10 to obtain status information of the battery device 100 from the battery monitoring device 10 . The external control unit 220 can perform two-way communication with the external communication unit 210, specifically, the external control unit 220 can analyze the acquired state information of the battery device 100, and can determine that the battery cell 20 Whether the temperature, pressure, current, voltage or air pressure, gas, etc. are abnormal. In addition, the external control unit 220 can also be used to output control instructions to the battery monitoring device 10 after analyzing and determining the state information. The application unit 230 can be used to output warning information, for example, the application unit 230 can be a central control display screen.

The first processing circuit 417 can be led out from an outlet port 315 on the cover plate 31 .

Please also refer to FIG. 11 , in this embodiment, the first processing circuit 417 can be led out from the outlet port 315 on the cover plate 31 . The second processing circuit 418 can be exported together with the negative port 312 on the cover plate 31 , that is, the first processing circuit 417 of the battery monitoring device 10 can share an output port with the negative port of the battery device 100 .

It can be understood that, in a possible implementation manner, the outlet port 315 may be located between the positive port 311 of the battery device 100 and the safety valve 313 .

Please also refer to FIG. 12 , which is a schematic structural diagram of the line output of the battery monitoring device 10 provided by another embodiment of the present application.

The difference from Fig. 10 and Fig. 11 is that in this embodiment, as shown in Fig. 12, both the first processing circuit 417 and the second processing circuit 418 can be derived from the same coaxial connector 316, thus It can be electrically connected with the external device 200 .

Furthermore, as shown in FIG. 13 , in a possible implementation manner, the coaxial joint 316 may be disposed between the positive port 311 of the battery device 100 and the safety valve 313 .

Please also refer to FIG. 14 , which is a schematic structural diagram of the line output of the battery monitoring device 10 provided by another embodiment of the present application.

The difference from FIG. 10 and FIG. 11 is that, in this embodiment, as shown in FIG. 14 , the first processing circuit 417 and the second processing circuit 418 can be connected from Exported at the ports in between.

Furthermore, as shown in FIG. 15 , in a possible implementation manner, the cover plate 31 is also provided with an outlet port 317 and an outlet port 318, and the first processing circuit 417 and the second processing circuit 418 can be are exported from the outgoing port 317 and the outgoing port 318 respectively. Specifically, the outlet port 317 and the outlet port 318 may be located between the anode port 311 and the safety valve 313 . It can be understood that, in some possible implementation manners, both the outgoing port 317 and the outgoing port 318 may be BMA connectors.

Using the embodiments of the present application, by embedding the battery monitoring device (including multiple sensors and processors) inside the battery device, the temperature inside the battery can be sensitively monitored with limited influence on the electrochemical performance of the battery , stress and air pressure and other parameters, and can quickly output these signals to external devices. In addition, even if the wiring is drawn out from the inside of the battery device, the battery device still has good airtightness. Therefore, the interior of the battery device in the embodiment of the present application has characteristics of state measurability, safety and controllability.

The following further introduces the manufacturing method of the battery device 100 according to the embodiment of the present application.

As shown in FIG. 16 , first, the battery monitoring device 10 (comprising a plurality of sensors and processors) is placed on the last negative electrode sheet 201 of the negative electrode of the battery cell 20, and the first processing circuit of the battery monitoring device 10 417 and the second processing circuit 418 lead out the lines. Since the battery device 100 has a large number of pole pieces, it is necessary to pre-weld the positive pole tab 211 and the negative pole tab 212 . As shown in FIG. 17 , the positive tab 211 of the battery device 100 is welded to the positive connecting piece 213, and the negative tab 212 is welded to the negative connecting piece 214, wherein the material of the positive connecting piece 213 can be aluminum. The material of the negative electrode connecting sheet 214 may be nickel-plated copper. As shown in FIG. 18 , the positive pole tab 211 and the negative pole tab 212 are then welded to the positive pole pole 321 and the negative pole pole 322 on the cover plate 31 of the battery device 100 . As shown in FIG. 19 , the pole group 50 (including the battery cell and the battery monitoring device) is put into the casing 30 and welded with the cover plate 31 . Then inject the electrolyte from the liquid injection hole 314, form and extract gas, and seal the liquid injection hole (that is, weld the liquid injection hole 314). It can be understood that the embodiment shown in FIG. 7 (that is, the battery monitoring device is embedded between the cells) and the embodiment shown in FIG. 9 (that is, the battery monitoring device is embedded between the casing and the cells) The manufacturing method of the device can be the same as the above-mentioned manufacturing method, and will not be repeated here.

Three wiring schemes of the battery device 100 in the embodiment of the present application will be introduced below.

The first line lead-out solution is: as shown in FIG. 20 , the second processing line 418 of the battery monitoring device 10 can be lead out from the negative port 312 of the battery device 100 (leading position 1), and the battery monitor The first processing circuit 417 of the device 10 can be led out from a place located between the positive connecting piece 213 and the negative connecting piece 214 (ie leading out position 2). Then, it can be exported again from the corresponding position. For example, the first processing line 417 can be led out from the outlet port 315 , and the second processing line 418 can be led out together with the negative port 312 of the battery device 100 . It can be understood that the negative terminal 312 of the cover plate 31 may be a perforated port. The design of the negative terminal 312 has a welding position and a hole for the negative tab of the battery core, so that the processor line can be drawn out, and the hole can be provided with a layer of insulating sleeve to prevent the line from contacting.

The second line drawing scheme is: as shown in FIG. 21 , the first processing line 417 and the second processing line 418 of the battery monitoring device 10 can be drawn out from the place between the positive connecting piece 213 and the negative connecting piece 214 (that is, lead out position 2). Then, it can be exported again from the corresponding position. For example, the first processing line 417 and the second processing line 418 of the battery monitoring device 10 can be led out from the coaxial connector 316 .

The third line drawing scheme is: as shown in FIG. 22 , the first processing line 417 and the second processing line of the battery monitoring device 10 can be drawn out from between the positive connecting piece 213 and the negative connecting piece 214 (that is, the leading out position 2 locations). Then, it can be exported again from the corresponding position. For example, the first processing circuit 417 and the second processing circuit 418 of the battery monitoring device 10 are respectively derived from the outgoing port 317 and the outgoing port 318 .

By using the battery monitoring device and the battery device in the embodiment of the present application, by embedding the battery monitoring device (including multiple sensors and processors) inside the battery device, it is possible to sensitively monitor the battery with limited influence on the electrochemical performance of the battery. Internal parameters such as temperature, stress, and air pressure can quickly output these signals to external devices, so that real-time monitoring of the state of the battery can be realized, and real-time warnings of problems with the battery can be realized. In addition, the technical solution of the embodiment of the present application increases the safety and reliability of the battery, and can quickly feedback and give an alarm when the battery is abnormal, so as to protect the life safety of the user.

The above is only a preferred implementation mode of the application, and is not intended to limit the application in any form. Although the application is a preferred implementation mode disclosed above, it is not intended to limit the application. Any skilled person familiar with this field , without departing from the scope of the technical solution of the present application, when the technical content disclosed above can be used to make some changes or be modified into equivalent implementations with equivalent changes, but as long as it does not depart from the technical solution of the present application, according to the technical content of the present application In essence, any simple modification, equivalent change and modification made to the above embodiments still fall within the scope of the technical solution of the present application.

Claims

A battery monitoring device, used for monitoring the state of the battery cell in the battery device, characterized in that the battery monitoring device includes a plurality of sensors, a processor and a processing circuit;

The plurality of sensors are used to sense various parameters of the battery cell;

The processor is electrically connected to the plurality of sensors, and is configured to receive the various parameters, so as to determine the state information of the battery cell according to the various parameters;

The processing circuit is electrically connected to the processor, and the processing circuit includes a first processing circuit and a second processing circuit, and both the first processing circuit and the second processing circuit are used to convert the state of the electric core The information is reported to an external device.
The battery monitoring device according to claim 1, wherein:

The first processing line is led out from a first lead-out port on the battery device, and the second processing line is led out together with the negative terminal of the battery device.
The battery monitoring device according to claim 1, wherein:

Both the first processing line and the second processing line are led out from coaxial connectors on the battery device.
The battery monitoring device according to claim 1, wherein:

The first processing circuit is derived from a second outlet port on the battery device, and the second processing circuit is derived from a third outlet port on the battery device.
The battery monitoring device according to any one of claims 1-4, characterized in that,

The plurality of sensors includes at least one of a temperature sensor, a pressure sensor, a voltage sensor, a current sensor, a barometric pressure sensor or a gas sensor.
A battery device, characterized in that the battery device includes a plurality of battery cells, a casing, and the battery monitoring device according to any one of claims 1-5, wherein the battery cells and the battery monitoring device housed in the housing.
The battery device according to claim 6, wherein,

The cell includes a plurality of sequentially stacked negative pole pieces, separators or solid electrolytes and positive pole pieces, and the battery monitoring device is arranged on the last negative pole piece of the battery core.
The battery device according to claim 6, wherein,

The battery monitoring device is arranged between two batteries.
The battery device according to claim 6, wherein,

The battery monitoring device is arranged between the battery core and the casing.
The battery device according to any one of claims 6-9, characterized in that,

The housing includes a cover plate, on which a positive port, a negative port, and a safety valve are arranged, and the safety valve is located between the positive port and the negative port, and the safety valve is used for disabling the battery The gas in the device is exhausted.
The battery device according to claim 10, wherein,

The cover plate is also provided with a first lead-out port, the first processing line of the battery monitoring device is led out from a first lead-out port on the battery device, and the second line processing line is connected to the negative port of the battery device Export together.
The battery device according to claim 10, wherein,

A coaxial connector is also provided on the cover, and the first processing circuit and the second processing circuit of the battery monitoring device are both led out from the coaxial connector.
The battery device according to claim 10, wherein,

The cover plate is also provided with a second lead-out port and a third lead-out port, the first processing circuit is led out from the second lead-out port, and the second processing circuit is led out from the third lead-out port.