Battery with safety monitoring function, battery system and electric automobile

Abstract

The utility model discloses a battery with safety monitoring, a battery system and an electric vehicle, the battery comprises a single battery main body and a battery monitor, the battery monitor comprises a data monitoring unit, a data processing unit and a display; the data monitoring unit is arranged in the single battery main body and is used for collecting state data of the single battery main body; the data processing unit is arranged on the outer side of the single battery main body, respectively receives the state data acquired by the data monitoring unit according to a first preset condition and outputs a display signal, and the display is arranged on the outer side of the single battery main body and receives and displays the display signal transmitted by the data processing unit. According to the battery provided by the invention, the air pressure, the expansion force, the cathode potential, the voltage, the current and the temperature in the battery are monitored in real time through the safety detector, and multi-data conjoint analysis is performed through the data processing unit, so that early warning of a single battery safety accident is realized, and the early warning accuracy of the single battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and in particular to a battery, a battery system and an electric vehicle with safety monitoring. Background Art

[0002] In the new energy vehicle battery energy storage market, electrochemical energy storage systems based on lithium-ion batteries have become a new driving force for industrial development, but safety has always been the focus of various industries on lithium-ion batteries. In recent years, lithium battery fire accidents have occurred both at home and abroad, causing serious economic losses and adverse social impacts. Safety issues have gradually become the primary issue for the large-scale application of lithium batteries in new energy vehicles. Existing new energy vehicles usually use multiple single cells to form a battery module, and multiple battery modules to form a battery system for power supply and operation. At present, most battery systems use a unified battery management system to monitor and manage the information of single cells, but the battery management system generally collects the voltage, current and temperature of the battery to estimate the SOC, SOP and SOH of the battery and realize the monitoring of the battery status. Only collecting and monitoring the voltage, current and temperature of the battery cannot provide early warning of a short circuit in the battery. In addition, all cells share a battery management system and a warning threshold, which is very easy to produce false alarms and missed alarms. Utility Model Content

[0003] The present application provides a battery, a battery system and an electric vehicle with safety monitoring to solve the technical problems that the prior art cannot provide early warning of battery short circuits, and that a shared battery management system is prone to false alarms and missed alarms, so as to achieve the technical effects of monitoring the health status of the battery, providing early warning of battery short circuits, swelling and lithium deposition, and improving the accuracy of battery warnings.

[0004] To solve the above technical problems, in a first aspect, the present application provides a battery with safety monitoring, comprising a single battery body and a battery monitor installed on the single battery body;

[0005] The battery monitor includes a data monitoring unit, a data processing unit and a display;

[0006] The data monitoring unit is arranged inside the single battery body and is used to collect status data of the single battery body;

[0007] The data processing unit is arranged outside the single battery body, and the data processing unit receives the state data collected by the air pressure monitoring unit, the expansion force monitoring unit and the three-electrode monitoring unit respectively according to a first preset condition, and outputs a display signal; the first preset condition includes a collection time period and / or a collection cycle;

[0008] The display is installed outside the single battery body, and receives the display signal transmitted by the data processing unit and displays it.

[0009] Preferably, the data monitoring unit includes an air pressure monitoring unit, an expansion force monitoring unit and a three-electrode monitoring unit.

[0010] Preferably, the single cell body comprises a top cover, the top cover is provided with an explosion-proof valve, the air pressure monitoring unit is an air pressure monitor, and the air pressure monitor is arranged close to the explosion-proof valve.

[0011] Preferably, the single battery body includes a battery cell and a shell, and the battery cell is arranged in the shell; the expansion force monitoring unit is a thin film pressure sensor, and the thin film pressure sensor is multiple and attached to the inside of the battery cell and / or between the battery cell and the shell.

[0012] Preferably, the single cell body includes a negative electrode column, the three-electrode monitoring unit is electrically connected to the negative electrode column, and the three-electrode monitoring unit includes a reference electrode, which is a lithium-plated copper wire and is insulated and wrapped by a diaphragm.

[0013] Preferably, the data monitoring unit also includes a current monitoring unit, a voltage monitoring unit and / or a temperature monitoring unit; the single battery body also includes a positive electrode column and a negative electrode column; the voltage monitoring unit is connected to the positive electrode column and the negative electrode column, and outputs the status data to the data processing unit, and the status data includes voltage data; the current monitoring unit is connected to the positive electrode column and / or the negative electrode column, and outputs the status data to the data processing unit, and the status data includes current data; the temperature monitoring unit outputs the status data to the data processing unit, and the status data includes temperature data.

[0014] Preferably, it also includes an alarm and / or a communication unit;

[0015] The communication unit is connected to the data processing unit, and is used to receive the data transmitted by the data processing unit and send it outward; the alarm is connected to the data processing unit, and the data processing unit determines whether the status data is abnormal according to a second preset condition, and if so, outputs an alarm instruction, and the alarm receives the alarm instruction and alarms; the second preset condition includes an air pressure threshold, a pressure threshold, a current threshold, a voltage threshold, and / or a temperature threshold.

[0016] Preferably, the display is a touch screen, and the display is also used to set the first preset condition and / or the second preset condition.

[0017] In a second aspect, the present application also provides a battery system, which includes a power supply battery and a BMS battery management system, wherein the power supply battery is composed of a plurality of batteries electrically connected as described above, and the BMS battery management system is communicatively connected to battery monitors of all the batteries.

[0018] In a third aspect, the present application also provides an electric vehicle, which includes the battery system as described above.

[0019] The present application provides a battery with safety monitoring, a battery system and an electric vehicle, wherein the battery includes a single cell body and a battery monitor installed on the single cell body, the battery monitor includes a data monitoring unit, a data processing unit and a display; the data monitoring unit is arranged inside the single cell body, including an air pressure monitoring unit, an expansion force monitoring unit and a three-electrode monitoring unit; the data processing unit is arranged outside the single cell body, the data processing unit receives the state data collected by the air pressure monitoring unit, the expansion force monitoring unit and the three-electrode monitoring unit respectively according to a first preset condition, and outputs a display signal, the display is installed outside the single cell body, the display receives the display signal transmitted by the data processing unit and displays it. The battery with safety monitoring provided by the present application monitors the air pressure, expansion force, negative electrode potential, voltage, current and temperature inside the battery in real time through a safety detector, performs joint analysis of multiple data through a data processing unit, realizes monitoring of the battery health status, and issues such as battery short circuit, expansion and lithium deposition are warned at an early stage, thereby improving the accuracy of single cell warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of a battery with safety monitoring provided by a preferred embodiment of the present application;

[0021] Figure 2 It is a two-dimensional plan view of a battery with safety monitoring provided by a preferred embodiment of the present application;

[0022] Figure 3 It is a schematic diagram of the structure of a battery monitor provided by a preferred embodiment of the present application;

[0023] Reference numerals:

[0024] 1- single battery body, 2- battery monitor, 3- display, 4- top cover, 5- battery shell, 6- battery cell, 7- positive electrode column, 8- negative electrode column, 9- explosion-proof valve, 10- data monitoring unit, 11- data processing unit, 12- alarm, 13- communication unit, 101- air pressure monitoring unit, 102- expansion force monitoring unit, 103- three-electrode monitoring unit, 104- current monitoring unit, 105- voltage monitoring unit, 106- temperature monitoring unit, 111- processor, 112- memory. DETAILED DESCRIPTION

[0025] The following is a detailed description of the implementation methods of the present application in conjunction with the accompanying drawings. The examples are provided only for illustrative purposes and cannot be understood as limiting the present application. The accompanying drawings are only for reference and illustration purposes and do not constitute a limitation on the scope of protection of the patent of the present application. Based on the examples in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0026] In order to solve the technical problems that the existing technology is unable to provide early warning of battery short circuit, and that sharing a battery management system is very prone to false alarms and missed alarms, the embodiments of the present application provide a battery with safety monitoring, which detects the battery health status and provides early warning of problems such as battery short circuit, swelling and lithium deposition, thereby achieving the technical effect of improving the accuracy of battery warning.

[0027] See also Figure 1 and 2 As shown, in an embodiment of the present application, a battery with safety monitoring is provided, the battery comprising a single cell body 1 and a battery monitor 2 mounted on the single cell body 1, the battery monitor 2 being connected to the positive electrode column 7 and the negative electrode column 8 of the single cell body 1 for supplying power to the battery monitor 2.

[0028] The battery monitor 2 includes a data monitoring unit 10 , a data processing unit 11 and a display 3 .

[0029] The data monitoring unit 10 and the data processing unit 11 are connected to each other, and the data processing unit 11 is connected to the display 3 .

[0030] In the preferred embodiment of the present application, the data monitoring unit 10 is disposed inside the single battery body 1 and includes an air pressure monitoring unit 101 , an expansion force monitoring unit 102 and a three-electrode monitoring unit 103 ;

[0031] The data processing unit 11 is arranged on the outside of the single battery body 1. The data processing unit 11 receives the status data collected by the air pressure monitoring unit 101, the expansion force monitoring unit 102 and the three-electrode monitoring unit 103 respectively according to the first preset condition, and outputs a display signal. The status data includes: air pressure monitoring data, expansion force monitoring data and three-electrode monitoring data.

[0032] In a preferred embodiment of the present application, the first preset condition includes: data collection time period, data collection frequency and cycle, etc. The setting of the first preset condition can realize the acquisition of data of a specific time period, specific frequency and cycle according to needs, so as to make the safety monitoring of the battery more targeted.

[0033] The display 3 is mounted on the outside of the single battery body 1 , and receives and displays the display signal transmitted by the data processing unit 11 . In other embodiments, the display 3 may be a touch screen, which may be used to input and set the first preset condition.

[0034] like Figures 1-2 As shown, the battery with safety monitoring disclosed in the present application has a single cell body 1 including a battery case 5, a top cover 4 and a battery cell 6. A positive electrode column 7, a negative electrode column 8 and an explosion-proof valve 9 are arranged on the top cover 4, and the battery cell 6 is arranged inside the battery case 5. The battery cell 6 includes a positive electrode material, a negative electrode material and an isolation material. An electrolyte is injected into the battery cell 6. Under the action of the electrolyte, a potential difference will occur between the positive electrode material and the negative electrode material. The positive electrode material and the negative electrode material are electrically connected to the top cover 4, so that a potential difference is generated between the positive electrode column 7 and the negative electrode column 8 on the top cover 4.

[0035] like Figure 3 As shown, the battery monitor 2 includes a display 3, a data monitoring unit 10 and a data processing unit 11. The data monitoring unit 10 is arranged inside the single battery body 1, and includes an air pressure monitoring unit 101, an expansion force monitoring unit 102 and a three-electrode monitoring unit 103. The display 3 and the data processing unit 11 are installed on the outside of the top cover 4 of the single battery body 1, and are connected to the positive pole 7 and the negative pole 8 of the single battery body 1. The data processing unit 11 is connected to the data monitoring unit 10 through various circuits, including an air pressure monitoring circuit, an expansion force monitoring circuit, and a three-electrode monitoring circuit. The air pressure monitoring circuit is connected to the air pressure monitoring unit 101, the expansion force monitoring circuit is connected to the expansion force monitoring unit 102, and the three-electrode monitoring circuit is connected to the three-electrode monitoring unit 103.

[0036] In a preferred embodiment of the present application, the data processing unit 11 includes a processor 111 and a memory 112 connected to each other. The processor 111 is used to receive data and perform data analysis and processing, and to send corresponding processing signals; the memory 112 is used to store data.

[0037] In a preferred embodiment of the present application, the battery with safety monitoring further includes an alarm 12 and / or a communication unit 13 .

[0038] The alarm 12 and / or the communication unit 13 are both connected to the data processing unit 11 , and the communication unit 13 is used to receive data transmitted by the data processing unit 11 and send it outward.

[0039] The data processing unit 11 determines whether the status data is abnormal according to the second preset condition, and outputs an alarm instruction if it is abnormal. The alarm device 12 receives the alarm instruction and sounds an alarm.

[0040] In a preferred embodiment of the present application, the second preset condition includes thresholds for various status data and other thresholds for determining the battery status. The second preset condition is the same as the first preset condition in that it is set through the display according to specific needs, and the operation is convenient and flexible.

[0041] In other embodiments, the data processing unit 11 may also include only the processor 111 , and send the data to the outside for storage via the communication unit 13 .

[0042] In a preferred embodiment of the present application, the data monitoring unit 10 also includes a current acquisition unit 104, a voltage acquisition unit 105 and a temperature acquisition unit 106. Correspondingly, the data processing unit 11 is also connected to the corresponding current acquisition unit 104, voltage acquisition unit 105 and temperature acquisition unit 106 through a current monitoring circuit, a voltage monitoring circuit and a temperature monitoring circuit.

[0043] In the preferred embodiment of the present application, the current monitoring unit 105 is a Hall current sensor, and the magnetic core and the Hall element of the Hall current sensor are mounted on the positive pole 7 or the negative pole 8 under the top cover 4. The current flowing through the pole will cause the change of the magnetic field around the pole, and the change signal is collected by the Hall current sensor, processed by the data processing unit 11, and output as the charging and discharging current data of the battery cell.

[0044] In the preferred embodiment of the present application, the voltage monitoring unit 105 is connected to the positive pole 7 and the negative pole 8 of the single battery body 1 and outputs the voltage data of the battery. According to the voltage value of the battery, the SOC of the battery, that is, the state of charge of the battery, can be evaluated, which is used to indicate the available state of the remaining charge in the battery, generally expressed as a percentage. When charging or discharging the battery, it is determined whether it is charged to the upper voltage limit or discharged to the lower voltage limit based on the obtained voltage value of the battery, and the alarm 12 is controlled to issue an early warning.

[0045] By monitoring the voltage data and current data of charging and discharging and combining the charging and discharging time, the data processing unit 11 calculates the charging capacity and the discharging capacity, monitors the capacity change of the battery in real time, and obtains the battery capacity attenuation data.

[0046] In a preferred embodiment of the present application, the temperature monitoring unit 106 is a temperature sensor, such as a thermocouple. The temperature sensor is fixed on the temperature test point of the single cell body 1. The temperature test point is set according to specific needs, and is generally set at the center and outside of the large surface of the battery cell, the bottom of the battery cell, and the positive and negative pole ears and positive and negative pole columns. During charging and discharging, it is used to monitor the temperature of the center of the large surface of the battery cell, the outside of the large surface, the bottom of the battery cell, the positive and negative pole ears and the positive and negative pole columns. Different temperature thresholds are set for different temperature test points. When the temperature of the temperature test point exceeds the corresponding temperature threshold, the alarm 12 issues a high temperature warning, and issues a thermal runaway warning in advance.

[0047] In the preferred embodiment of the present application, the air pressure monitoring unit 101 is an air pressure monitor, which is arranged near the explosion-proof valve 9, generally below the explosion-proof valve, and is used to monitor the air pressure inside the battery. When the air pressure inside the battery reaches the air pressure threshold, the alarm 12 sounds an alarm in advance.

[0048] In the preferred embodiment of the present application, the expansion force monitoring unit 102 uses a thin film pressure sensor, which is attached to the large surface of the battery cell. The number of thin film pressure sensors can be set one or more according to the number of battery cells in the single battery body 1. For example, the thin film pressure sensor can be attached to the inside of the battery cell of the single battery body 1, and / or between the battery cell and the shell. The attachment position is selected according to the demand for battery expansion force data. When the battery expands to a certain extent, it will damage the module, cause the battery shell to rupture, burn, explode and other safety problems. The expansion force threshold is set. When the battery expansion force reaches the preset expansion force threshold, the alarm 12 will issue a safety warning.

[0049] In a preferred embodiment of the present application, the three-electrode monitoring unit 103 is electrically connected to the negative pole 8, and the three-electrode monitoring unit 103 includes a reference electrode, one end of which is implanted in the battery cell 6 of the single cell body 1. Specifically, a lithium-plated copper wire is used as a reference electrode, and one end of the copper wire that is lithium-plated is implanted in the battery cell. The thin lithium-plated copper wire is covered by a diaphragm so that it is not electrically connected to the positive and negative electrode materials of the battery cell. The lithium-plated copper wire implanted in the battery cell is equivalent to a foreign body in the battery cell, so the thinner the copper wire implanted in the battery cell, the better. The lithium-plated copper wire exposed outside the battery cell is insulated and wrapped with a diaphragm to prevent the thin copper wire from being electrically connected to the pole piece, pole ear, pole column, or top cover, and to prevent the lithium-plated copper wire from being easily broken.

[0050] Through the loop composed of the reference electrode and the negative electrode column 8, the negative electrode voltage can be monitored to determine whether the battery has a risk of lithium deposition. When the battery is charging, the positive electrode potential will continue to rise, and the negative electrode potential will continue to decrease. In theory, when lithium deposition occurs at the negative electrode, the potential of the negative electrode relative to lithium is 0V. However, the actual situation is that during the process of charging the battery, due to the polarization internal resistance and the ohmic internal resistance of the battery itself, the voltage of the negative electrode when lithium deposition occurs is generally below 0 volts or close to 0 volts.

[0051] Theoretically, the lower the negative electrode voltage value, the higher the risk of lithium plating at the negative electrode. The obtained negative electrode voltage value can be used to make a preliminary judgment on the negative electrode lithium plating.

[0052] In the preferred embodiment of the present application, based on the real-time charge and discharge voltage data obtained by the voltage monitoring unit 105, the real-time charge and discharge current data obtained by the current monitoring unit 104, the expansion force monitoring data obtained by the expansion force monitoring unit 102, and the negative electrode voltage obtained by the three-electrode monitoring unit 103, a comprehensive analysis of the lithium plating risk of the battery is performed. Specifically, first, the SOC of the battery is evaluated according to the charge and discharge voltage data; further, the charging capacity and the discharge capacity are calculated according to the charge and discharge voltage data, the current data, and the charge and discharge time, and the capacity change of the battery is monitored in real time to obtain the battery capacity attenuation data; further, according to the SOC, the battery capacity attenuation data and the battery expansion force data, the thickness change of the negative electrode column 8 is judged; finally, according to the thickness change of the negative electrode column 8 and the voltage change of the negative electrode column 8, the negative electrode lithium plating is comprehensively evaluated to improve the accuracy of the negative electrode lithium plating risk assessment.

[0053] Among battery safety failures, internal short circuit is a very common and typical failure type in battery cell failure. The causes of internal short circuit include: metal impurities (Fe, Co, Ni, Cr, Cu, etc.) in the battery raw materials, the introduction of metal foreign matter during the manufacturing process, etc., which leads to the formation of lithium dendrites, mechanical deformation, and diaphragm rupture and collapse caused by extreme high temperature, etc., which eventually lead to direct contact between the positive and negative electrodes, causing abnormal self-discharge of the battery, which gradually develops and eventually causes thermal runaway of the battery, which is a type of abnormality that needs to be focused on in battery safety. The early stage of internal short circuit is the micro-short circuit stage. In the micro-short circuit stage, self-discharge develops slowly, and almost no heat is generated during the process. At this time, the voltage drop of the battery is very slow, and there is almost no temperature rise. In the middle stage of internal short circuit, due to the accumulation of heat, the internal short circuit phenomenon of the battery begins to become obvious, the voltage drop rate increases, and the temperature rises rapidly. In the later stage of internal short circuit, the temperature reaches the disintegration temperature of the diaphragm, the internal short circuit of the battery intensifies, an exothermic chain reaction occurs, the temperature rises abnormally, and the diaphragm further disintegrates, causing a large-area internal short circuit, causing the battery to uncontrollably suffer thermal runaway, which is manifested by voltage disappearance and a sharp rise in temperature.

[0054] From the above development of internal short circuit in batteries, it can be known that internal short circuit in batteries evolves from micro short circuit in batteries. For abnormal cells with micro short circuit, the power is gradually consumed during the development of micro short circuit, and the cells gradually deviate from normal ones. Moreover, this process is irreversible, that is, once the difference occurs, it will not be restored by itself without human intervention.

[0055] In a preferred embodiment of the present application, based on the time series of real-time charging and discharging voltage data obtained by the voltage monitoring unit 105, the time series of real-time charging and discharging current data obtained by the current monitoring unit 104, and the time series of real-time charging and discharging temperature data obtained by the temperature monitoring unit 106, the changes in battery voltage, current and temperature are obtained to perform comprehensive analysis and monitoring of battery micro-circuit breaks, thereby providing early warning of battery cell short-circuit failures.

[0056] In the preferred embodiment of the present application, the display 3 adopts a touch screen, which is usually off, and turns on after being touched to display the collected status data. Through the touch screen, people can interact with the battery monitor 2. For example, through the screen interaction interface, the first preset condition, the second preset condition, the alarm frequency and the alarm sound volume can be set.

[0057] Based on the battery with safety monitoring, the present application also provides a battery system, including a power supply battery and a BMS battery management system. The power supply battery is composed of multiple batteries provided in the embodiments of the present application that are electrically connected, and the BMS battery management system is communicatively connected to the battery monitors of all batteries.

[0058] When the battery is used as a single cell, such as energy storage, mobile power supply, etc., the battery monitor 2 of the battery can protect the single cell, such as overcharge and over discharge reminder, overcurrent reminder, overtemperature warning, overpressure warning, excessive expansion force warning, battery cell lithium precipitation warning, etc. When the single cell battery forms a module, the battery monitor 2 of each single cell is connected to the BMS battery management system, which can not only work together but also realize monitoring.

[0059] For the connection method between the single battery and the BMS battery management system, wired connection or wireless connection can be used. In the preferred embodiment of the present application, wireless connection is used to simplify wiring, improve module space utilization, and avoid problems caused by line aging, tangling, etc.

[0060] Based on the battery system, the present application also provides an electric vehicle, which is powered by the battery system disclosed in the present application.

[0061] The battery, battery system and electric vehicle with safety monitoring proposed in the embodiment of the present application are aimed at solving the technical problems that the existing technology cannot provide early warning when a battery short circuit occurs, and that a battery management system is shared, which is very easy to generate false alarms and missed alarms. The battery of the present application includes a single battery body and a battery monitor installed on the single battery body. The battery monitor includes a data monitoring unit, a data processing unit and a display; the data monitoring unit is arranged inside the single battery body, including an air pressure monitoring unit, an expansion force monitoring unit and a three-electrode monitoring unit; the data processing unit is arranged outside the single battery body, and the data processing unit receives the state data collected by the air pressure monitoring unit, the expansion force monitoring unit and the three-electrode monitoring unit according to the first preset condition, and outputs a display signal, and the display is installed outside the single battery body, and the display receives the display signal transmitted by the data processing unit and displays it. The battery with safety monitoring provided in the present application monitors the air pressure, expansion force, negative electrode potential, voltage, current and temperature inside the battery in real time through a safety detector, and performs joint analysis of multiple data through a data processing unit to realize monitoring of the battery health status, early warning of battery short circuit, expansion and lithium precipitation, and improve the accuracy of single battery warning.

[0062] The above-mentioned embodiments only express several preferred implementation modes of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the utility model, and these improvements and substitutions should also be regarded as the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be based on the protection scope of the claims.

Claims

1. A battery with safety monitoring, characterized in that: A battery comprising a single battery body and a battery monitor mounted on the single battery body; The battery monitor includes a data monitoring unit, a data processing unit and a display; The data monitoring unit is arranged inside the single battery body and is used to collect status data of the single battery body; The data processing unit is arranged outside the single battery body, and receives the status data collected by the data monitoring unit according to a first preset condition, and outputs a display signal, wherein the status data includes: air pressure monitoring data, expansion force monitoring data and three-electrode monitoring data; the first preset condition includes a collection time period and / or a collection cycle; The display is installed outside the single battery body, and receives the display signal transmitted by the data processing unit and displays it.

2. The battery with safety monitoring as claimed in claim 1, characterized in that: The data monitoring unit includes an air pressure monitoring unit, an expansion force monitoring unit and a three-electrode monitoring unit.

3. The battery with safety monitoring as claimed in claim 2, characterized in that: The single cell body comprises a top cover, on which an explosion-proof valve is arranged, and the air pressure monitoring unit is an air pressure monitor, which is arranged close to the explosion-proof valve.

4. The battery with safety monitoring as claimed in claim 2, characterized in that: The single battery body comprises a battery cell and a shell, wherein the battery cell is arranged in the shell; The expansion force monitoring unit is a thin film pressure sensor, there are multiple thin film pressure sensors, and the thin film pressure sensors are attached inside the battery core and / or between the battery core and the shell.

5. The battery with safety monitoring as claimed in claim 2, characterized in that: The single cell body comprises a negative electrode column, the three-electrode monitoring unit is electrically connected to the negative electrode column, and the three-electrode monitoring unit comprises a reference electrode, which is a lithium-plated copper wire and is insulated and wrapped by a diaphragm.

6. The battery with safety monitoring as claimed in claim 2, characterized in that: The data monitoring unit also includes a current monitoring unit, a voltage monitoring unit and / or a temperature monitoring unit; The single cell body also includes a positive electrode column and a negative electrode column; The voltage monitoring unit is connected to the positive pole and the negative pole, and outputs the status data to the data processing unit, wherein the status data also includes voltage data; The current monitoring unit is connected to the positive pole and / or the negative pole, and outputs the status data to the data processing unit, wherein the status data also includes current data; The temperature monitoring unit outputs the status data to the data processing unit, and the status data also includes temperature data.

7. The battery with safety monitoring according to claim 1 or 6, characterized in that: Also includes an alarm and / or a communication unit; The communication unit is connected to the data processing unit and is used to receive data transmitted by the data processing unit and send it outward; The alarm is connected to the data processing unit, and the data processing unit determines whether the status data is abnormal based on a second preset condition, and outputs an alarm instruction if so. The alarm receives the alarm instruction and alarms; the second preset condition includes an air pressure threshold, a pressure threshold, a current threshold, a voltage threshold, and / or a temperature threshold.

8. The battery with safety monitoring as claimed in claim 7, characterized in that: The display is a touch screen, and the display is also used to set the first preset condition and / or the second preset condition.

9. A battery system, characterized in that: The battery system includes a power supply battery and a BMS battery management system, wherein the power supply battery is composed of a plurality of batteries electrically connected as described in any one of claims 1 to 8, and the BMS battery management system is communicatively connected to battery monitors of all the batteries.

10. An electric vehicle, characterized in that: The electric vehicle comprises the battery system as claimed in claim 9.

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