CN217719732U

CN217719732U - Battery safety monitoring device and battery

Info

Publication number: CN217719732U
Application number: CN202123448388.6U
Authority: CN
Inventors: 曲云鹏; 汪晓林; 梁钊
Original assignee: Borderless Suzhou New Material Technology Co ltd
Current assignee: Borderless Suzhou New Material Technology Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-11-01
Anticipated expiration: 2031-12-30

Abstract

The application provides a battery safety monitoring device and a battery, which belong to the technical field of battery safety and are used for monitoring the expansion state of the battery, wherein the battery comprises a battery body, and the battery safety monitoring device comprises a flexible monitoring body and a monitor; the flexible monitoring body is used for extending along the surface of the battery body, the extending path of the flexible monitoring body passes through the easily-expandable position of the battery body, the flexible monitoring body can elastically deform along with the expansion of the battery body at the easily-expandable position, the monitor is electrically connected with the flexible monitoring body, and the monitor is used for monitoring the deformation information of the flexible monitoring body and obtaining the expansion information of the battery body according to the deformation information; the battery adopts the flexible monitoring body in the battery safety monitoring device. This application aims at solving the technical problem that can't monitor whether the battery takes place the inflation danger among the prior art.

Description

Battery safety monitoring device and battery

Technical Field

The application belongs to the technical field of battery safety, and particularly relates to a battery safety monitoring device and a battery.

Background

The existing batteries and the like are more and more widely used, the safety problem of the batteries is more and more important, and the expansion condition is often generated in the use process of the batteries, so that the quality problems and even dangers of the batteries are often caused, such as the fire and explosion of electric vehicles or electric automobiles. Generally speaking, the power source used by the electric automobile is a battery pack, the battery pack is a battery module formed by a plurality of battery cells through monitoring devices of a plurality of battery cells after series-parallel connection, and the battery module is prepared through an integral protection circuit and a structural design.

The conventional battery monitoring is that some judgments are carried out through the voltage and the electric current condition of test battery, can judge more easily to battery capacity and life-span etc. but battery in use charge-discharge fast can lead to the battery inflation, and the inflation just leads to dangers such as fire, explosion easily to a certain extent, and current monitoring devices can't monitor whether the battery takes place the inflation to and the inflation state of monitoring battery.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a battery safety monitoring device and battery, aim at solving the technical problem that can't monitor whether the battery takes place the inflation danger among the prior art.

A first object of the present application is to provide a battery safety monitoring device for monitoring a swelling state of a battery, the battery including a battery body, the battery safety monitoring device including a flexible monitoring body and a monitor; the flexible monitoring body is used for extending along the surface of the battery body, the extending path of the flexible monitoring body passes through the easy-expansion position of the battery body, the flexible monitoring body can elastically deform along with the expansion of the battery body at the easy-expansion position, the monitor is electrically connected with the flexible monitoring body, and the monitor is used for monitoring the deformation information of the flexible monitoring body and obtaining the expansion information of the battery body according to the deformation information.

Further, the battery body is battery package, battery module or electric core, the battery package includes the battery module that a plurality of arrays were arranged, the battery module includes the electric core that a plurality of arrays were arranged.

Further, the flexible monitoring body comprises a fiber sensor, the fiber sensor can deform based on tension or pressure, so that resistance value changes occur, and the monitor can monitor the resistance value changes of the fiber sensor.

Furthermore, the monitor comprises a monitoring circuit and a monitoring unit, the monitoring circuit is electrically connected with the flexible monitoring body and forms a loop with the flexible monitoring body, and the monitoring unit is electrically connected with the monitoring circuit and is used for acquiring the deformation information.

Furthermore, the flexible monitoring body is arranged around the battery body in a linear or net shape.

Furthermore, the monitor still includes alarm unit, alarm unit with monitor unit communication connection is used for when monitor unit monitors the deformation volume of flexible monitoring body surpasss and sets for the suggestion of reporting to the police when the scope.

Compared with the prior art, the beneficial effects of the application are that: compared with the prior art, this battery safety monitoring device is through the flexible monitoring body of easy inflation position installation at battery body, the flexible monitoring body sets up with the surface laminating of easy inflation position, and certain extension length has in easy inflation position, therefore, when the easy inflation position of battery body takes place inflation or swell, the surface that the flexible monitoring body can enough follow battery body takes place to warp, and then produce deformation, the monitor is connected with flexible monitoring body electricity, for the power supply of flexible monitoring body, at the in-process that flexible monitoring body warp, the monitor is used for monitoring the deformation information of the flexible monitoring body, and obtain the inflation information of battery body according to deformation information, thereby make the user can detect whether the battery takes place risks such as inflation and swell, and can predict the inflation state and the trend of battery, mention the effect of warning to the user, be favorable to improving the security in the battery use.

A second objective of the present application is to provide a battery, which includes a battery body and a flexible monitoring body, the flexible monitoring body is the flexible monitoring body in the battery safety monitoring device described in any of the above, the flexible monitoring body has a first connection end and a second connection end, and the first connection end and the second connection end are used to be electrically connected to a monitor.

Furthermore, the battery body is a battery module or a battery core, the battery module comprises a plurality of battery cores arranged in an array, the flexible monitoring body comprises at least one annular monitoring body, and the monitoring body surrounds and is attached to the outer surface of each battery body; the monitoring bodies on the same battery body are arranged in parallel at intervals.

Further, the battery further comprises a shell with a containing cavity arranged inside, the battery body is contained in the containing cavity, and the flexible monitoring body is wound and attached to the shell.

Furthermore, a tightening device is connected to the flexible monitoring body and is used for tightening the flexible monitoring body on the battery body.

Compared with the prior art, the beneficial effects of the application are that: compared with the prior art, the flexible monitoring body of this battery's the easy inflation position installation of battery body, the flexible monitoring body sets up with the surface laminating of easy inflation position, and certain extension length has in easy inflation position, therefore, when the easy inflation position of battery body takes place inflation or swell, the surface that the flexible monitoring body can follow the battery body takes place to warp, and then produce deformation, the monitor is connected with flexible monitoring body electricity, for the power supply of flexible monitoring body, at the in-process of flexible monitoring body deformation, the flexible monitoring body passes through the electric energy and turns into the signal of telecommunication that the monitor can receive with the deformation signal of flexible monitoring body, the monitor can carry out analysis processes to the signal of telecommunication simultaneously according to the procedure, thereby make the user can detect whether the risk such as battery takes place inflation and swell, and can predict the inflation state and the trend of battery, mention the effect of warning to the user, be favorable to improving the security in the battery use.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a first schematic structural diagram of a battery safety monitoring device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a battery safety monitoring device according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a battery according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a battery according to an embodiment of the present disclosure;

fig. 5 is a schematic structural view of a single battery module in fig. 3;

fig. 6 is a first schematic structural diagram of a single cell in fig. 3;

fig. 7 is a structural diagram ii of a single cell in fig. 3;

fig. 8 is a schematic structural diagram three of a single battery cell in fig. 3;

FIG. 9 is a schematic representation of the relationship between the length of a flexible monitoring body under tension and its internal resistance change;

FIG. 10 is a schematic representation of the diameter of a flexible monitoring body as it is subjected to pressure as it changes in internal resistance.

Description of the reference numerals: 1. a battery pack; 11. an electric core; 12. a battery module; 2. a monitor; 3. a flexible monitoring body; 4. a tightening device; 5. a housing.

Detailed Description

Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "upward," "vertical," "horizontal," "bottom," "inner," "outer," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience in describing the present application and for simplicity in description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present application.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments.

Referring to fig. 1-5, one of the objectives of the present invention is to provide a battery safety monitoring device for monitoring the expansion state of a battery, wherein the battery includes a battery body, and the battery safety monitoring device includes a flexible monitoring body 3 and a monitor 2; the flexible monitoring body 3 is used for extending along the surface of the battery body and is arranged, the extending path of the flexible monitoring body 3 passes through the easy-expansion position of the battery body, the flexible monitoring body 3 can expand along with the battery body at the easy-expansion position and generate elastic deformation, the monitor 2 is electrically connected with the flexible monitoring body 3, and the monitor 2 is used for monitoring the deformation information of the flexible monitoring body 3 and obtaining the expansion information of the battery body according to the deformation information.

That is to say, the flexible monitoring body 3 is arranged to extend along the surface of the easy expansion position of the battery body, and can extend along the battery body to form a U shape or a ring shape, and the flexible monitoring body 3 is electrically connected with the monitor 2 and can form a loop with the monitor 2; the flexible monitoring body 3 can be deformed based on the deformation of the easily expandable position, and can convert the deformation amount into an electrical signal through electric energy, and the monitor 2 can receive and process the electrical signal.

Specifically, the battery can adopt a lead-acid battery or a lithium battery, and for the lead-acid battery, the appearance of the storage battery is likely to bulge, wherein one possibility is caused by long-term overcharge, which causes deformation of a storage battery plate shed and expansion of active substances; the other is caused by the blockage of the air outlet of the storage battery and the overcharge, gas in the battery cannot be discharged, and the internal pressure of the battery is increased; for a lithium battery, one is bulging (expansion) caused by overcharge, and overcharge can cause lithium atoms in an anode material to completely run into a cathode material, so that originally full grids of the anode are deformed and collapsed, which is also a main reason for the reduction of the electric quantity of the lithium battery; the other is swelling (expansion) caused by over-discharge, in the first charge and discharge process of the liquid lithium ion battery, an electrode material and an electrolyte react on a solid-liquid interface to form a passivation layer covering the surface of the electrode material, the formed passivation layer film can effectively prevent electrolyte molecules from passing through, but Li < + > can be freely inserted and removed through the passivation layer, and the passivation layer has the characteristics of a solid electrolyte, so that the passivation layer is called a solid electrolyte interface (solid electrolyte interface), SEI for short, the SEI film can protect a negative electrode material, the material structure is not easy to collapse, the cycle life of the electrode material can be prolonged, the SEI film is not invariable, a little change is caused in the charge and discharge process, a part of organic matters can be reversibly changed, the SEI film can be damaged after the battery is over-discharged, the SEI film can be damaged, and the negative electrode material can be collapsed after the SEI of the negative electrode material is protected, so that the swelling phenomenon is formed.

However, in both the lead-acid battery and the lithium battery, after expansion, the external wrapping layer of the whole battery (the battery pack 1) or the external wrapping layer of the independent battery module 12 or the external wrapping layer of the independent battery cell 11 in the battery structure may expand or bulge, and therefore, in order to monitor the expansion state of the battery, the flexible monitoring body 3 is disposed at a position where expansion and bulging are likely to occur, such as the external wrapping layer of the battery (including the whole external wrapping layer of the battery pack 1, the external wrapping layer of the independent battery module 12, and the external wrapping layer of the independent battery cell 11).

The flexible monitoring body 3 can be fixed on the outer surface of the battery body in a sticking (bonding) way, can be arranged in a groove formed on the outer surface of the battery body, or can be directly hung on the outer surface of the battery body, and the mounting way of the flexible monitoring body 3 and the battery body is not limited; the flexible monitoring body 3 can be elastically deformed in the length direction or the extending direction thereof, and the flexible monitoring body 3 has a strong tensile resistance and can be stretched to a length 1 to 10 times of the original length thereof. The flexible monitoring body 3 is a special material which can convert self deformation signals into electric signals through electric energy; specifically, the flexible monitoring body 3 may adopt flexible sensing fibers with conductive properties, and after the flexible sensing fibers are locally deformed, the internal properties (e.g., resistance) of the flexible sensing fibers may be changed, so that the electric signals fed back by the flexible sensing fibers are changed, and whether the flexible monitoring body 3 is deformed or not may be determined according to the fed-back electric signals, and the deformation condition of the flexible monitoring body 3 may be detected, thereby reflecting the expansion condition of the battery.

The monitor 2 is electrically connected with the flexible monitoring body 3, the monitor 2 can provide electric energy for the flexible monitoring body 3, so that the flexible monitoring body 3 converts a deformation signal (a tension signal or a pressure signal) into an electric signal through the electric energy, the deformation information of the flexible monitoring body 3 is monitored, and the expansion information of the battery body is obtained according to the deformation information; monitor 2 can adopt cloud platform server etc. and monitor 2 can generate the change curve through the procedure to whether the size of deformation and deformation volume takes place for analysis flexible monitoring body 3, and then reflects whether the battery takes place the inflation and the inflation state and the trend of battery, mentions the effect of warning to the user, is favorable to improving the security in the battery use.

In this embodiment, this battery safety monitoring device is through installing flexible monitoring body 3 in the easy inflation position of battery body, flexible monitoring body 3 sets up with the surperficial laminating of easy inflation position, and have certain extension length in easy inflation position, therefore, when the easy inflation position of battery body takes place inflation or swell, flexible monitoring body 3 can take place to warp along with the surface of battery body, and then produce deformation, monitor 2 is connected with flexible monitoring body 3 electricity, for flexible monitoring body 3 power supply, in the in-process that flexible monitoring body 3 warp, flexible monitoring body 3 passes through the electric energy and turns into the signal of telecommunication that monitor 2 can receive with the deformation signal (pulling force signal or pressure signal) of flexible monitoring body 3, monitor 2 can carry out analysis processes to the signal of telecommunication simultaneously according to the procedure, thereby make the user can detect whether the risk such as battery takes place inflation and swell, and can predict the inflation state and the trend of battery, mention the effect of warning to the user, be favorable to improving the security in the battery use.

In one embodiment, referring to fig. 9 and 10, the flexible monitoring body 3 includes a fiber sensor, the fiber sensor can deform based on tension or pressure to generate a resistance change or change the resistance, the monitor 2 can monitor the resistance change of the fiber sensor, fig. 9 is a schematic diagram illustrating a relationship between a length of the flexible monitoring body and an internal resistance change when the flexible monitoring body 3 is under tension, fig. 10 is a schematic diagram illustrating a relationship between a diameter of the flexible monitoring body and an internal resistance change when the flexible monitoring body 3 is under pressure, nodes in the diagrams are experimental data, and line segments are model data.

Specifically, the flexibility monitoring body 3 includes an outer sleeve body and an electrical conductor which is arranged in the outer sleeve body and can be deformed, and after the deformation of the electrical conductor, an electrical signal changes. The outer sleeve body is a cylindrical structure formed by bendable and telescopic elastic materials. The material of the outer sleeve body can be thermoplastic elastomer, thermosetting elastomer, thermoplastic elastomer or plastic compound, etc., the range of the tensile strain of the material is 0-2000%, and chemical additives can be added into the material to regulate and control the mechanical property, the weather resistance, etc.

The electrical signal in this embodiment is a resistance value, a voltage value, or a current value of the electrical conductor, and the outer casing is electrically connected to the monitor, so that a change in the resistance value of the electrical conductor can be transmitted to the monitor. In particular, the electrical conductor may be a liquid metal, a conductive electrolyte or other liquid, or a solid and deformable conductive substance. The resistance value of the electrical conductor has the following calculation formula:

R＝ρ*L/S (1)

where ρ is the material resistivity of the electrical conductor;

l is the length of the electrical conductor;

s is the area of the cross section of the electrical conductor;

r is the resistance value of the electrical conductor.

The volume of the electrical conductor is calculated as follows:

V＝L*S (2)

where V is the volume of the electrical conductor.

From the formula (1) and the formula (2), the following calculation formula of the resistance value of the electric conductor can be obtained:

R＝L*L*ρ/V

in an alternative embodiment, the flexible monitoring body 3 is a fiber sensor, the fiber sensor can be prepared from sensing fibers and sensing fibers, the fiber sensor forms a matching structure between the sensing fibers and the sensing fibers, the deformation of the sensing fibers can be fed back to the deformation of the sensing fibers, the change of the detection environment is synchronously converted into the signal change of the sensing fibers, and synchronous response between fiber functions is realized.

Wherein, the sensing fiber is an environment sensing material, including but not limited to shape memory polymer fiber, hydrogel fiber, shape memory polymer doped fiber and other sensitive deformation materials and doped materials. The sensing fiber comprises an electrical material, including but not limited to a liquid metal, a piezoelectric material, a piezoresistive material, and the like, which can generate an electrical signal along with deformation. The sensing fiber can be packaged by using a flexible and insulating material such as Polydimethylsiloxane (PDMS) and the like, so that the electrical performance of the internal material is not influenced.

The cooperating structure formed between the sensing fiber and the sensing fiber includes but is not limited to a linear structure such as a spiral structure, a winding structure, a planar woven structure, a planar structure, or a combination of the linear structure and the planar structure, and can be selected according to the shape of the easy-to-swell position of the battery. The deformation quantity of sensing fibers is used as a detection target, electric signals comprise but are not limited to resistance signals, current signals, capacitance signals, pressure signals and the like, a matching structure is formed between the sensing fibers and the sensing fibers, and the deformation of the sensing fibers can be sensitively and accurately fed back to the deformation of the sensing fibers, so that the change of a detection environment is synchronously converted into the signal change of the sensing fibers, and synchronous response among fiber functions is realized.

The fiber sensor is assembled with different materials through a mechanical structure, so that the different materials are separated in sensing and sensing functions after mechanical action is carried out on the different materials, synchronous response among fiber functions is realized, and a sensor combination with high sensitivity, multiple functions and multiple modes can be formed. And, because of the separation on the material, can make the sensor realize better leakproofness, help the use of battery under the complicated environment.

Furthermore, the sensing fibers comprise tension or pressure sensing fibers, temperature sensing fibers, humidity sensing fibers and the like, so that the ambient temperature and the ambient humidity around the battery can be detected, the use state and the environment of the battery can be monitored, and the safety of the use environment of the battery is improved.

In another alternative embodiment, the flexible monitoring body 3 may be a flexible tension or pressure sensing fiber rope, which is prepared by mixing high-strength fibers with conductive substances, so that a mechanical signal generated during the stretching process of the flexible tension or pressure sensing fiber rope can be converted into an electrical signal, the mechanical signal is generated by the deformation of the flexible tension or pressure sensing fiber rope, the deformation signal is equal to the mechanical signal, the monitor 2 detects the stretching resistance of the flexible tension or pressure sensing fiber rope, and the monitor 2 can feed back the expansion deformation condition of the battery through a time-resistance change rate curve.

In one embodiment, the monitor 2 includes a monitoring circuit electrically connected to the flexible monitoring body 3 and forming a loop with the flexible monitoring body 3, and a monitoring unit electrically connected to the monitoring circuit and configured to acquire deformation information.

That is, the battery safety monitoring device comprises a flexible monitoring body 3, a monitoring circuit and a monitoring unit; the flexible monitoring body 3 is used for extending along the surface of the easy expansion position of the battery, and the monitoring circuit is connected with the flexible monitoring body 3 and forms a loop with the flexible monitoring body 3; the flexible monitoring body 3 can be deformed based on the deformation of the easily-expanded position, and can convert the deformation into an electric signal through electric energy, the monitoring unit is electrically connected (or in communication connection) with the monitoring circuit, and the monitoring unit can receive and process the electric signal.

The monitoring unit adopts monitoring terminal, and flexible monitoring body 3 transmits monitoring data for monitoring terminal through the signal of telecommunication to upload monitoring data to detection center service cloud platform, can accomplish real time monitoring, and can judge and predict life-span and the danger of being surveyed the battery according to uploading data. Specifically, the monitoring unit comprises a signal monitor, a signal collector and a signal transmitter, wherein the signal collector is used for collecting and storing electric signals, the signal transmitter is used for transmitting the electric signals outwards, one end of the signal collector is electrically connected with the signal monitor, the other end of the signal collector is electrically connected with the signal transmitter, and the battery safety monitoring device further comprises a power supply which is used for supplying electric energy to the signal monitor, the signal collector and the signal transmitter.

In one embodiment, referring to fig. 3 and 4, the flexible monitoring body 3 is arranged in a linear or net-like or spiral shape around the easily expandable position of the battery body.

In this embodiment, the battery body is a battery pack 1, a battery module 12 or an electric core 11, the battery pack 1 includes the battery modules 12 arranged in a plurality of arrays, and the battery module 12 includes the electric cores 11 arranged in a plurality of arrays. The easy expansion position of battery body mainly refers to electric core 11 outside in battery module 12, the outside (surface) of independent battery module 12 and the outside (surface) of whole battery package 1 in the battery body, its outside all is equipped with parcel layer or shell 5, flexible monitoring body 3 is linear or netted or spiral and encloses and form the annular, annular flexible monitoring body 3 encloses and establishes the surface at electric core 11 parcel layer, one or several positions in the surface of independent module parcel layer and the whole parcel layer of battery package 1, flexible monitoring body 3 can enclose and establish the one deck annular, or enclose and establish the annular that forms the multilayer interval arrangement along the length of battery body or direction of height, in order to carry out comprehensive monitoring, improve the security.

In one embodiment, the flexible monitoring body 3 is a flexible fiber conductor made of a heat-resistant material.

In this embodiment, since the battery body generates a large amount of heat in the battery body during charging and discharging, the internal and external temperatures of the battery are increased, and the heat resistance of the flexible monitoring body 3 is enhanced, thereby ensuring the service life of the whole monitoring device.

In one embodiment, the monitor 2 further comprises an alarm unit, the alarm unit is in communication connection with the monitoring unit, and is used for giving an alarm when the monitoring unit monitors that the deformation amount of the flexible monitoring body 3 exceeds a preset range, that is, the flexible monitoring body 3 is provided with an early warning line, and when the deformation amount of the flexible monitoring body 3 reaches the early warning line, that is, the battery reaches the safety early warning line.

In the embodiment, the alarm unit can adopt an audible and visual alarm, and prompts a user that the battery has the expansion risk through sound or light, so that the safety of the battery in the use process is improved.

A second object of the present application is to provide a battery, as shown in fig. 3 and 4, the battery includes a battery body 1 and a flexible monitoring body 3, the flexible monitoring body 3 is the flexible monitoring body 3 in the above battery safety monitoring device, the flexible monitoring body 3 is disposed along a surface of an easily expandable position of the battery body, the flexible monitoring body 3 can be deformed based on deformation of the easily expandable position, and can convert a deformation amount (deformation signal) into an electrical signal by electrical energy; the flexible monitoring body 3 is provided with a first connecting end and a second connecting end, the first connecting end and the second connecting end are used for being electrically connected with the monitor 2, the monitor 2 can receive and process electric signals, and the deformation signals comprise tension signals or pressure signals and the like.

Specifically, the battery body is circular or three-dimensional, and the easily expandable position of the battery body at least includes the outside (outer surface) of the battery cell 11 in the battery body, the outside (outer surface) of the independent module in the battery body, and the outside (outer surface) of the entire battery body.

The monitor 2 comprises a monitoring circuit and a monitoring unit, the monitoring circuit is connected with the flexible monitoring body 3 and forms a loop with the flexible monitoring body 3, and the monitoring circuit is used for providing electric energy for the flexible monitoring body 3; the flexible monitoring body 3 can be based on the deformation of easy inflation position and produce deformation, and can turn into the deformation volume the signal of telecommunication through the electric energy, the monitoring unit electricity is connected (or communication connection) in monitoring circuit, the monitoring unit can receive and handle the signal of telecommunication, transmit monitoring data for monitor terminal through the signal of telecommunication, and upload monitoring data to detection center service cloud platform, form the inflation data of battery, can accomplish real time monitoring, judge whether the battery is in safety range, and can judge and predict life-span and danger of being surveyed the battery according to uploading data.

In this embodiment, through installing flexible monitoring body 3 in the easy inflation position of battery body, flexible monitoring body 3 sets up with the surperficial laminating of easy inflation position, and have certain extension length in easy inflation position, therefore, when the easy inflation position of battery body takes place inflation or swell, flexible monitoring body 3 can take place to warp along the surface of battery body, and then produce deformation, monitor 2 is connected with flexible monitoring body 3 electricity, for flexible monitoring body 3 power supply, in the in-process that flexible monitoring body 3 warp, flexible monitoring body 3 passes through the deformation signal conversion of electric energy with flexible monitoring body 3 to the signal of telecommunication that monitor 2 can receive, monitor 2 can carry out analysis processes according to the procedure signal of telecommunication simultaneously, thereby make the user can detect whether the risk such as battery takes place inflation and swell, and can predict the inflation state and the trend of battery, mention the effect of warning to the user, be favorable to improving the security in the battery use.

In one embodiment, as described with reference to fig. 3 to 7, the battery body is a battery pack 1 or a battery module 12 or a battery cell 11, the battery pack 1 includes a plurality of battery modules 12 arranged in an array, the battery module 12 includes a plurality of battery cells 11 arranged in an array, and the flexible monitoring body 3 extends along an outer surface of each battery cell 11 and/or an outer surface of each battery module 12 and/or an outer surface of the entire battery pack 1.

In this embodiment, the battery pack 1 includes a plurality of battery cells 11, the plurality of battery cells 11 are connected in series, parallel and other complex circuits to form the battery module 12, the plurality of battery modules 12 are connected in series, parallel and other complex circuits to form the battery pack 1 with a larger capacity, wherein when the battery body swells, it may be that one or more battery cells 11 in the battery body swell, and further the battery module 12 and the battery pack 1 swell, so in order to detect and judge the swelling condition of the battery body more accurately, the flexible monitoring body 3 is wound on the outer surface of each battery cell 11, the outer surface of each battery module 12 and the outer surface of the whole battery pack 1, and the precision of the flexible monitoring body 3 can reach the micron level (1 × 10) (1 × 10 variation precision of the flexible monitoring body 3 can reach the micron level)^-6m), the laminating and the winding of the flexible monitoring body 3 can be directed against single electric core 11, acquire the inflation data of single electric core 11, also can be directed against single battery module 12 and whole battery package 1, acquire the inflation data of whole battery body, judge the whole damage of battery body according to the inflation data, still wherein the inflation that the damage of single electric core 11 or single battery module 12 led to, detect more accurately.

In one embodiment, referring to fig. 3 to 8, the flexible monitoring body 3 includes at least one annular monitoring body, and the monitoring body surrounds and is attached to an outer surface of each battery body, that is, the monitoring body surrounds and is attached to an outer surface of each battery cell 11 and/or an outer surface of each battery module 12 and/or an outer surface of the entirety of the plurality of battery modules 12; the monitoring bodies on the same battery body are arranged in parallel at intervals.

In this embodiment, the flexible monitoring body 3 includes at least one annular or ring-shaped monitoring body, the monitoring body may be enclosed in a linear or net-shaped or spiral shape at an easily expandable position of the battery body, and the flexible monitoring body 3 is enclosed in a linear or net-shaped or spiral shape to form a ring; generally, the outermost layer of each cell 11 and the outermost layer of each battery module 12 are wrapped with wrapping layers (sealing layers or shells), and when the battery module 12 expands, the wrapping layers can expand (bulge), so that the monitoring body is surrounded on the outer surface of the wrapping layers and is tightly attached to the outer surface of the wrapping layers, and when the battery module 12 expands, the monitoring body is extruded to deform; in addition, the surface of the battery package 1 that a plurality of battery module 12 are constituteed also can wrap up parcel layer (sealing layer or casing) usually, when one of them battery module 12 takes place the inflation, can extrude the parcel layer of outside battery package 1, and then make the parcel layer of battery body take place inflation (swell) phenomenon, the event will be monitored the body and enclose the surface of establishing at the parcel layer of battery package 1, and hug closely the surface on parcel layer, when one of them battery module 12 inflation, thereby draw the parcel layer of pressing battery package 1, and then draw and press the monitoring body, make it take place to warp.

In one embodiment, referring to fig. 2, the battery further includes a housing 5 having a receiving cavity therein, the battery body is received in the receiving cavity, and the flexible monitoring body 3 is wound around and attached to the housing 5.

In the present embodiment, the flexible monitoring body 3 may be disposed on the inner surface or the outer surface of the housing 5, and the gap between the battery body and the housing 5 is generally very small, so that the battery body expands and then extrudes the outer housing 5 to expand together, and therefore the flexible monitoring body 3 is adopted in the present embodiment to detect the expansion or bulge state of the housing 5, so as to reflect the expansion of the whole battery.

In one embodiment, referring to fig. 1 to 5, a tightening device 4 is connected to the flexible monitoring body 3, and the tightening device 4 is used for tightening the flexible monitoring body 3 on the battery body or the housing 5, so that the flexible monitoring body 3 is connected with the battery body or the housing 5 more tightly, and when the flexible monitoring body 3 is loosened, the flexible monitoring body 3 can be tightened, and the detection accuracy is ensured.

The foregoing is considered as illustrative only of the preferred embodiments of the invention, and is presented only for the purpose of illustrating the principles of the invention and not in any way to limit its scope. Any modifications, equivalents and improvements made within the spirit and principles of the present application and other embodiments of the present application without the exercise of inventive faculty will occur to those skilled in the art and are intended to be included within the scope of the present application.

Claims

1. A battery safety monitoring device for monitoring the expansion state of a battery, the battery comprising a battery body, characterized in that the battery safety monitoring device comprises a flexible monitoring body and a monitor; the flexible monitoring body is used for extending along the surface of the battery body, the extending path of the flexible monitoring body passes through the easy-expansion position of the battery body, the flexible monitoring body can elastically deform along with the expansion of the battery body at the easy-expansion position, the monitor is electrically connected with the flexible monitoring body, and the monitor is used for monitoring the deformation information of the flexible monitoring body and obtaining the expansion information of the battery body according to the deformation information.

2. The battery safety monitoring device according to claim 1, wherein the battery body is a battery pack, a battery module or a battery cell, the battery pack includes a plurality of battery modules arranged in an array, and the battery module includes a plurality of battery cells arranged in an array.

3. The battery safety monitoring device according to claim 1 or 2, wherein the flexible monitoring body comprises a fiber sensor, the fiber sensor is capable of deforming based on tension or pressure, and further generating resistance change, and the monitor is capable of monitoring the resistance change of the fiber sensor.

4. The battery safety monitoring device according to claim 1 or 2, wherein the monitor includes a monitoring circuit and a monitoring unit, the monitoring circuit is electrically connected to the flexible monitoring body and forms a loop with the flexible monitoring body, and the monitoring unit is electrically connected to the monitoring circuit for acquiring the deformation information.

5. The battery safety monitoring device according to claim 1 or 2, wherein the flexible monitoring body is arranged around the battery body in a linear or net shape.

6. The battery safety monitoring device according to claim 4, wherein the monitor further comprises an alarm unit, the alarm unit is in communication with the monitoring unit and is used for giving an alarm when the deformation of the flexible monitoring body monitored by the monitoring unit exceeds a preset range.

7. A battery comprising a battery body and a flexible monitoring body, wherein the flexible monitoring body is used in the battery safety monitoring device according to any one of claims 1 to 6, and the flexible monitoring body has a first connection end and a second connection end, and the first connection end and the second connection end are used for being electrically connected with a monitor.

8. The battery of claim 7, wherein the battery body is a battery module or a cell, the battery module comprises a plurality of cells arranged in an array, and the flexible monitoring body comprises at least one monitoring body in a ring shape, and the monitoring body surrounds and is attached to the outer surface of each battery body; the monitoring bodies on the same battery body are arranged in parallel at intervals.

9. The battery according to claim 7 or 8, wherein the battery further comprises a housing having a receiving cavity therein, the battery body is received in the receiving cavity, and the flexible monitoring body is wound around and attached to the housing.

10. The battery according to claim 7 or 8, wherein a tightening device is connected to the flexible monitoring body, and the tightening device is used for tightening the flexible monitoring body on the battery body.