Battery monitoring device and battery

Abstract

A battery monitoring device, characterized in that the battery monitoring device comprises: a base, one side of the base being mounted and fixed to one side of a magnetic shielding structure layer; a housing mounted and fixed to the other side of the magnetic shielding structure layer; a first groove being provided on the side of the base to which the magnetic shielding structure layer is mounted and fixed, a gas sensor being arranged in the first groove; the other side of the base contacting a battery tab and being provided with a second groove, a third groove, and a fourth groove, the third groove being located between the second groove and the fourth groove, a first strain sensor being arranged in the second groove, a second strain sensor being arranged in the third groove, and a temperature sensor being arranged in the fourth groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of batteries, in particular a battery monitoring device and a battery. STATE OF THE ART

[0002] With the development of new energy technologies, issues of battery safety have become increasingly important.

[0003] Improper use, short circuit, or the like may cause thermal runaway of the energy storage battery, which may cause serious consequences, therefore it is necessary to monitor various parameters in real time during the operation of energy storage batteries to provide early warnings and reduce the damage caused by thermal runaway of the battery.

[0004] Current technology uses a variety of different sensors to monitor key battery locations. However, since these sensors are independent, wiring space and costs increase. Furthermore, these sensors are electrical signal sensors and are susceptible to electromagnetic interference, which affects data accuracy. CONTENTS OF THE PRESENT UTILITY MODEL

[0005] In view of the above problems, a battery monitoring device and a battery are proposed to overcome or at least partially solve the above problems.

[0006] A battery monitoring device comprising: a base, one side of the base being mounted and fixed to one side of a magnetic shielding structure layer; a housing mounted and fixed on the other side of the magnetic shielding structure layer; wherein a first groove is provided on the side of the base to which the magnetic shielding structure layer is mounted and fixed, wherein a gas sensor is arranged in the first groove; wherein the other side of the base contacts a battery tab and is provided with a second groove, a third groove and a fourth groove, the third groove being located between the second groove and the fourth groove, a first strain sensor being arranged in the second groove, a second strain sensor being arranged in the third groove, a temperature sensor being arranged in the fourth groove.

[0007] Optionally, a plastic film structure is additionally arranged between the magnetic shielding structure layer and the housing.

[0008] Optionally, the magnetic shielding structure layer is provided with several ventilation holes.

[0009] Optionally, the housing is also provided with a window structure, with the position of the window structure being opposite the first groove.

[0010] Optionally, the base further comprises a fifth groove connected to the first groove and a sixth groove connected to the second groove, wherein an optical fiber transmission line is arranged in the fifth groove and the sixth groove.

[0011] Optionally, the temperature sensor consists of a pre-stressed optical fiber Bragg grating encapsulated in a quartz capillary.

[0012] Optionally, the first strain sensor is a strain sensor from a microelectromechanical system.

[0013] Optionally, the second strain sensor is an optical fiber Bragg grating sensor.

[0014] Optionally, the gas sensor is a fiber optic hydrogen sensor.

[0015] Optionally, the base is also provided with several positioning holes that penetrate the base.

[0016] Optionally, the magnetic shielding structure layer is provided with multiple mounting holes, with the mounting holes corresponding to the positioning holes.

[0017] A battery comprising a battery monitoring device as described above, wherein the battery monitoring device is mounted and secured to a tab of the battery.

[0018] The embodiments of the present utility model have the following advantages: In the present utility model, a temperature sensor, a strain sensor, and a gas sensor are integrated into the first, second, third, and fourth grooves of the base, so that multiple parameters of the battery tab can be synchronously monitored, thereby effectively reducing wiring space and costs; furthermore, the magnetic shielding structure layer can reduce electromagnetic interference and improve the accuracy of sensor data acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly explain the technical solutions of the present utility model, the drawings required for the descriptions in the present utility model are briefly described below. Obviously, the attached drawings in the following description represent only some embodiments of the present utility model, and other drawings can be obtained from these drawings without any creative effort by those skilled in the art. Fig. 1 is a schematic structural diagram of a battery monitoring device provided by an embodiment of the present invention; Fig. 2 is a schematic structural diagram of the base provided by an embodiment of the present utility model; Fig. 3 is a schematic structural diagram of a magnetic shielding structure layer provided in an embodiment of the present utility model; Fig. 4 is a schematic structural diagram of a housing of a magnetic shielding structure layer provided in an embodiment of the present utility model.

[0020] Explanation of reference numerals: Base 1, Positioning hole 104, First groove 109, Second groove 107, Third groove 105, Fourth groove 106, Fifth groove 110, Sixth groove 108, Magnetic shielding structure layer 2, Ventilation hole 201, Mounting hole 202, Housing 3, Window structure 301. DETAILED DESCRIPTION

[0021] Below, the technical solutions in the embodiments of the present utility model are described clearly and completely with reference to the drawings. Obviously, the described embodiments are some of the embodiments of the present utility model, not all of them. All other embodiments that a person of ordinary skill in the art can derive from the embodiments of the present utility model without creative effort are within the scope of the present utility model.

[0022] Terms in the description and claims of the present utility model such as "first" and "second" are used to distinguish similar objects, not to describe a particular order or sequence. It should be understood that the data thus used are interchangeable under appropriate circumstances, so that the embodiments of the present utility model can be carried out in orders other than those shown or described herein, and the objects distinguished by "first", "second", or the like usually belong to one category, and the number of objects is not limited. For example, the first object may be one or more. Furthermore, "and / or" in the description and claims represents at least one of the connected objects, and the character " / " generally indicates that the previously and subsequently connected objects are in an "or" relationship.

[0023] It should be understood that reference in this specification to "some embodiments" means that a particular feature, structure, or characteristic related to the embodiments is included in at least one embodiment of the present invention. Therefore, the appearance of "in some embodiments" in various places in this specification does not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0024] With reference to Fig. 1 is a schematic structural diagram of a battery monitoring device provided by an embodiment of the present utility model, comprising: A base 1, one side of the base 1 being mounted and fixed to one side of a magnetic shielding structure layer 2; a housing 3 mounted and fixed on the other side of the magnetic shielding structure layer 2.

[0025] As in Fig. 2, a first groove 109 is provided on the side where the magnetic shielding structure layer 2 is mounted and fixed of the base 1, a gas sensor is arranged in the first groove 109; the other side of the base 1 contacts a battery tab and is provided with a second groove 107, a third groove 105 and a fourth groove 106, the third groove 105 being located between the second groove 107 and the fourth groove 106, a first strain sensor is arranged in the second groove 107, a second strain sensor is arranged in the third groove 105, and a temperature sensor is arranged in the fourth groove 106.

[0026] In practical applications, the base 1 can be made of a polyimide film as a flexible support platform that directly contacts the surface of the battery tab, and the area of ​​the base 1 corresponds to the battery tab. The polyimide material features high temperature resistance, corrosion resistance, high strength, and light weight, allowing the base 1 to be used as the core support of the battery monitoring device mounted on the tab of the energy storage battery. Furthermore, it features high reliability in extreme environments, good thermal expansion matching with fiber optic sensors, and is suitable for micromachining.

[0027] The magnetic shielding structure layer 2 serves to shield electromagnetic interference, can shield high-frequency and low-frequency electromagnetic interference during battery charging and discharging, prevent the interference from the gas sensor, the first strain sensor, the second strain sensor, and the temperature sensor, and can also serve as an intermediate layer for isolating the functional coating and the external mechanical protection, thus improving the data acquisition accuracy and stability of the battery monitoring device.

[0028] In practical applications, the magnetic shielding structure layer 2 can be composed of a composite of a permalloy foil and a stainless steel mesh, with the permalloy foil and the stainless steel mesh bonded by a conductive silver adhesive. The magnetic shielding structure layer 2 can be assembled and fixed on the polyimide base 1 by hot-press bonding in combination with laser welding and other methods, combined with the protective layer and edge insulation treatment to achieve efficient electromagnetic shielding (can simultaneously shield high-frequency and low-frequency electromagnetic interference), corrosion resistance, and flexible compatibility.

[0029] The housing 3 may be made of a flexible material such as silica gel and serves as a packaging protection layer to provide protection for the battery monitoring device. Specifically, the housing 3 can provide mechanical protection (preventing scratches, vibrations, and impacts), insulation protection (preventing direct contact between the magnetic shielding structure layer 2 and the battery tab), and sealing protection (blocking external water vapor and contaminants), among other functions for the battery monitoring device.

[0030] In practical applications, the casing 3 can be arranged on the magnetic shielding structure layer 2 after being processed by processes such as scraping, molding, and step-by-step curing, which, in combination with the edge sealing and breathable design, provides mechanical protection, environmental insulation, and flexible compatibility for the battery monitoring device, thus ensuring long-term and stable operation under extreme battery working conditions.

[0031] The first groove 109, the second groove 107, the third groove 105, and the fourth groove 106 may be formed by laser etching. The first groove 109 and the second groove 107 may be rectangular grooves.

[0032] The third groove 105 and the fourth groove 106 can be arranged side by side. The second strain sensor provided in the third groove 105 and the temperature sensor provided in the fourth groove 106 can measure the temperature and strain of the battery tab synchronously, thereby decoupling the temperature monitoring from the strain monitoring.

[0033] The first strain sensor arranged in the second groove 107 can further ensure the stability and reliability of the strain monitoring.

[0034] The gas sensor arranged in the first groove 109 is used to monitor relevant parameters of the gas released during operation of the battery (for example, the hydrogen released during electrolysis of the battery) to confirm whether the battery is functioning normally.

[0035] In some embodiments of the present utility model, it is provided that a plastic film structure is additionally arranged between the magnetic shielding structure layer and the housing.

[0036] In practical applications, the plastic film structure can be an ePTFE (expanded polytetrafluoroethylene) film. Adding an ePTFE film between the magnetic shielding structure layer and the housing allows air to escape, prevents coating bubbles, and prevents the silica gel material of the housing from liquefying and penetrating the mesh holes of the magnetic shielding structure layer.

[0037] In some embodiments of the present utility model, it is provided that the magnetic shielding structure layer is provided with a plurality of ventilation holes.

[0038] As in Fig. As shown in Figure 3, the magnetic shielding structure layer 2 is provided with a plurality of ventilation holes 201. Since the magnetic shielding structure layer 2 is mounted and fixed above the gas sensor arranged in the first groove 109, a plurality of ventilation holes 201 are provided to allow the gas released from the battery to escape freely, thus not affecting the gas monitoring.

[0039] In practical applications, ultraviolet lasers or other methods can be used to punch holes in the magnetic shielding structure layer 2 made of permalloy foil to form a plurality of ventilation holes 201.

[0040] In some embodiments of the present utility model, it is provided that the housing is further provided with a window structure, wherein the position of the window structure is opposite the first groove.

[0041] As in Fig. 4, the housing 3 is further provided with a window structure 301, the position of the window structure 301 being opposite (e.g., directly above) the first groove 109 to ensure that the gas released from the battery can pass through the window structure 301 and fully contact the gas sensor in the first groove 109.

[0042] In some examples, an ePTFE film is provided between the magnetic shielding structure layer and the housing. The ePTFE film can be exposed through the window structure 301 to form a "breathable island," allowing gas to flow through the ePTFE film while preventing the liquid silica gel of the housing from penetrating the magnetic shielding structure layer or the base.

[0043] In some embodiments of the present utility model, the temperature sensor is provided to consist of a biased optical fiber Bragg grating encapsulated in a quartz capillary.

[0044] In practical applications, an optical fiber can be embedded in the fourth groove 106, and a temperature sensor is placed on top of the optical fiber. The temperature sensor consists of a pre-strained optical fiber Bragg grating (FBG) encapsulated in a quartz capillary with a low coefficient of thermal expansion. By encapsulating the FGB in the quartz capillary, the FGB only responds to a temperature change; after pre-strain, the FBG is always in a strained state to avoid strain errors caused by the relaxation of the FBG as temperatures decrease.

[0045] In some embodiments of the present utility model, it is provided that the first strain sensor is a strain sensor of a microelectromechanical system.

[0046] The strain sensor for a microelectromechanical system (MEMS) is a microsensor manufactured using semiconductor micromachining technology. In the present embodiment, the MEMS strain sensor can measure battery strain and features high sensitivity and miniaturization, further improving the reliability and stability of battery strain monitoring.

[0047] In some embodiments of the present utility model, it is provided that the second strain sensor is an optical fiber Bragg grating sensor.

[0048] In practical applications, the second strain sensor may be a bare fiber optic Bragg grating sensor embedded directly into the third groove and in contact with the base to monitor the battery's strain parameters.

[0049] In some embodiments of the present utility model, the base further comprises a fifth groove connected to the first groove and a sixth groove connected to the second groove; wherein an optical fiber transmission line is arranged in the fifth groove and the sixth groove.

[0050] As in Fig. As shown in Figure 2, the base 1 further includes a fifth groove 110 connected to the first groove 109 and a sixth groove 108 connected to the second groove 107. An optical fiber transmission line is arranged in the fifth groove 110 and the sixth groove 108. The optical fiber transmission line in the fifth groove 110 is used to transmit the data detected by the gas sensor, and the optical fiber transmission line in the sixth groove 108 is used to transmit the data detected by the first strain sensor.

[0051] In practical applications, the optical fiber transmission line in the fifth groove 110 and the sixth groove 108, after being led out of the battery monitoring device, can be connected to a corresponding demodulator and a capture card to capture data.

[0052] In some embodiments of the present utility model, it is provided that the gas sensor is an optical fiber hydrogen sensor.

[0053] In practical applications, the optical fiber hydrogen sensor can consist of an optical fiber embedded in the first groove and an FBG at its end. In some examples, the FBG can be bonded to a palladium-based composite material (such as palladium nanowire or graphene composite film). When the battery produces hydrogen, it will adhere to the palladium film, causing the film to deform and thus changing the FBG wavelength, thus enabling strain monitoring. To improve the stability of the optical fiber hydrogen sensor, a certain thickness of silicon nitride can be deposited on the surface of the palladium film to prevent electrolyte corrosion. The FBG can be a conventional FBG, or a hydrogen-sensitive FBG can be engraved into a tilted optical fiber grating (tilted fiber Bragg grating, TFBG).Subsequently, the sensitivity of hydrogen monitoring can be increased by surface plasmon resonance (SPR).

[0054] In practical applications, the palladium membrane area can also be partially covered with an ePTFE film as a breathable and waterproof membrane that allows hydrogen to pass through but blocks the penetration of silica gel.

[0055] In some embodiments of the present utility model, it is provided that the base is further provided with a plurality of positioning holes penetrating the base.

[0056] As in Fig. 2, the base 1 is further provided with a plurality of positioning holes 104 penetrating the base 1. The battery monitoring device can be positioned, mounted, and secured on the battery tab via the positioning holes 104, for example, by laser welding.

[0057] In some embodiments of the present utility model, it is provided that the magnetic shielding structure layer is provided with a plurality of mounting holes, wherein the mounting holes correspond to the positioning holes.

[0058] As in Fig. 3, the magnetic shielding structure layer 2 is provided with a plurality of mounting holes 202 that correspond to the positioning holes 104 and are used for mounting and fixing the magnetic shielding structure layer 2 to the base 1 and the battery tab.

[0059] In some embodiments of the present utility model, a battery is further provided in which the battery monitoring device described above is mounted and fixed to the battery tab.

[0060] The embodiments of the present utility model have the following advantages: In the present utility model, a temperature sensor, a strain sensor, and a gas sensor are integrated into the first, second, third, and fourth grooves of the base, so that multiple parameters of the battery tab can be synchronously monitored, thereby effectively reducing wiring space and costs; furthermore, the magnetic shielding structure layer can reduce electromagnetic interference and improve the accuracy of sensor data acquisition.

[0061] In practical applications, the battery monitoring device provided by the utility model can realize multi-parameter measurement of temperature, strain, and hydrogen of energy storage battery cells through a layered integrated structural design, and is particularly suitable for the condition detection of the tab of a lithium-ion battery. The battery monitoring device features small size, simple structure, and resistance to electromagnetic interference. It provides a highly integrated, interference-free, and corrosion-resistant multi-parameter optical fiber sensor for simultaneous monitoring of the tab temperature, strain, and hydrogen of energy storage batteries, improving the reliability of battery safety management.

[0062] Finally, it should be noted that in this article, relational terms such as "first" and "second" or the like are used merely to distinguish one entity or operation from another entity or operation and do not necessarily require or imply any actual relationship or order between those entities or operations. Furthermore, the terms "comprises," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, procedure, item, or terminal device containing a list of elements may include not only those elements but also other elements not expressly listed, or may also include elements inherent in such a process, procedure, item, or terminal device. Without further limitation, a term defined by the statement "comprises" includes...’ does not exclude the presence of additional identical elements in the process, procedures, article or terminal which it comprises.

[0063] The above information is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. All modifications, equivalent substitutions, improvements, and the like made within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

[1] Battery monitoring device, characterized by that the battery monitoring device comprises: a base, one side of the base being mounted and fixed to one side of a magnetic shielding structure layer; a housing mounted and fixed on the other side of the magnetic shielding structure layer; wherein a first groove is provided on the side of the base to which the magnetic shielding structure layer is mounted and fixed, wherein a gas sensor is arranged in the first groove; wherein the other side of the base contacts a battery tab and is provided with a second groove, a third groove, and a fourth groove, the third groove being located between the second groove and the fourth groove, wherein a first strain sensor is arranged in the second groove, wherein a second strain sensor is arranged in the third groove, wherein a temperature sensor is arranged in the fourth groove. [2] Battery monitoring device according to claim 1, characterized by that a plastic film structure is additionally arranged between the magnetic shielding structure layer and the housing. [3] Battery monitoring device according to one of the preceding claims, characterized by that the magnetic shielding structure layer is provided with several ventilation holes. [4] Battery monitoring device according to one of the preceding claims, characterized by that the housing is further provided with a window structure, the position of the window structure being opposite the first groove. [5] Battery monitoring device according to one of the preceding claims, characterized by that the base further comprises a fifth groove connected to the first groove and a sixth groove connected to the second groove; wherein an optical fiber transmission line is arranged in the fifth groove and the sixth groove. [6] Battery monitoring device according to one of the preceding claims, characterized by that the temperature sensor consists of a biased optical fiber Bragg grating encapsulated in a quartz capillary. [7] Battery monitoring device according to one of the preceding claims, characterized by that the first strain sensor is a strain sensor of a microelectromechanical system. [8] Battery monitoring device according to one of the preceding claims, characterized by that the second strain sensor is an optical fiber Bragg grating sensor. [9] Battery monitoring device according to one of the preceding claims, characterized by that the gas sensor is an optical fiber hydrogen sensor. [10] Battery monitoring device according to one of the preceding claims, characterized by that the base is also provided with several positioning holes that penetrate the base. [11] Battery monitoring device according to claim 10, characterized by that the magnetic shielding structure layer is provided with a plurality of mounting holes, the mounting holes corresponding to the positioning holes. [12] Battery, characterized by that a battery monitoring device according to one of claims 1 to 11 is mounted and fastened to a tab of the battery.

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