Pole piece assembly and battery module

Abstract

The utility model provides a pole piece assembly and a battery module, the pole piece assembly comprises a first pole piece, a second pole piece and a diaphragm, the polarity of the second pole piece is opposite to that of the first pole piece, the diaphragm is arranged between the first pole piece and the second pole piece, and the first pole piece, the second pole piece and the diaphragm are arranged in a winding or laminating manner; the temperature sensor is arranged on at least one of the first pole piece, the second pole piece and the diaphragm, and the temperature sensor is used for detecting the temperature of at least one of the first pole piece, the second pole piece and the diaphragm and outputting a signal. By applying the technical scheme of the utility model, the technical problem that the operation of the battery pack cannot be monitored in the prior art can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to an electrode assembly and a battery module. Background Art

[0002] Lithium-ion batteries have been widely used in the fields of energy storage systems and new energy vehicles. However, their safety problems have not been completely solved. In recent years, fire and explosion accidents related to lithium-ion batteries have been frequently reported, seriously endangering people's lives and property. The safety of lithium-ion batteries has become the main bottleneck restricting the large-scale and industrial application of lithium-ion batteries. Since lithium-ion batteries will inevitably age during long-term use, these phenomena are likely to cause problems such as thermal spread of the battery pack. If the abnormality of the battery is not detected in time, an irreparable accident will occur, thus reducing the safety of the battery pack during operation. Summary of the Utility Model

[0003] The embodiments of the utility model provide an electrode assembly and a battery module, which can improve the technical problem that the operation of the battery pack cannot be monitored in the related art.

[0004] In a first aspect, the embodiments of the utility model provide an electrode assembly, which includes: a first electrode, a second electrode, the polarity of the second electrode is opposite to that of the first electrode, a separator disposed between the first electrode and the second electrode, the first electrode, the second electrode and the separator are wound or stacked; a temperature sensor disposed on at least one of the first electrode, the second electrode and the separator, and the temperature sensor is used to detect the temperature of at least one of the first electrode, the second electrode and the separator and output a signal.

[0005] In one embodiment, a first sink is provided on the surface of the first electrode and / or the second electrode, and the temperature sensor is disposed in the first sink.

[0006] In one embodiment, the first electrode and / or the second electrode includes a current collector layer and an active layer, the active layer is disposed on one side of the current collector layer, the active layer is provided with a first sink, and the temperature sensor is disposed in the first sink.

[0007] In one embodiment, a second sink is provided on one side of the separator, and the temperature sensor is disposed in the second sink.

[0008] In one embodiment, the electrode assembly further includes a transmission member connected to the temperature sensor, and the transmission member is used to communicate with an external communication component, so as to receive the signal output by the temperature sensor and transmit the signal to the external communication component.

[0009] In one embodiment, at least one of the first electrode, the second electrode and the separator is provided with a third sink, and the transmission member is disposed in the third sink.

[0010] In one embodiment, the electrode sheet assembly includes a plurality of temperature sensors, and the plurality of temperature sensors are arranged in an array on at least one of the first electrode sheet, the second electrode sheet, and the separator.

[0011] In one embodiment, the distance between two adjacent temperature sensors in the first direction is L1, where 4 mm ≤ L1 ≤ 25 mm, and the first direction is the length direction of the first electrode sheet.

[0012] In one embodiment, the distance between two adjacent temperature sensors in the second direction is L2, where 1 mm ≤ L2 ≤ 5 mm, and the second direction is the width direction of the first electrode sheet.

[0013] In one embodiment, an insulating coating is provided on the surface of the temperature sensor.

[0014] In one embodiment, the material of the insulating coating includes at least one of polyimide, polypyromellitimide, polyetherimide, and polyamide-imide.

[0015] In one embodiment, the transmission member includes an optical fiber.

[0016] In a second aspect, an embodiment of the present invention provides a battery module, and the battery module includes the above-mentioned electrode sheet assembly.

[0017] By applying the technical solution of the present invention, temperature sensors are provided on at least one of the first electrode sheet, the second electrode sheet, and the separator. In this way, when thermal runaway occurs during the use of the battery, the temperature sensors can timely monitor the abnormal temperature of the battery, thereby improving the safety of the battery pack during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a three-dimensional schematic diagram of the electrode sheet assembly provided by the embodiment of the present invention;

[0020] Figure 2 is a three-dimensional schematic diagram of another perspective of the electrode sheet assembly provided by the embodiment of the present invention;

[0021] Figure 3 is a three-dimensional schematic diagram of the first electrode sheet or the second electrode sheet provided by the embodiment of the present invention;

[0022] Figure 4 is a front view schematic diagram of the first electrode sheet or the second electrode sheet provided by the embodiment of the present invention;

[0023] Figure 5 It is a schematic cross-sectional view of the temperature sensor provided by the embodiment of the present utility model.

[0024] Among them, the above-mentioned drawings include the following reference numerals:

[0025] 10. First pole piece;

[0026] 20. Second pole piece;

[0027] 30. Diaphragm;

[0028] 40. Temperature sensor; 41. Positioning unit; 42. Acquisition unit; 43. Conversion unit;

[0029] 50. Transmission member;

[0030] 61. First sinking groove; 62. Second sinking groove; 63. Third sinking groove;

[0031] X. First direction; Y. Second direction. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

[0033] As Figures 1 to 5 shown, in a first aspect, the embodiment of the present utility model provides a pole piece assembly, and the pole piece assembly includes: a first pole piece 10, a second pole piece 20, the polarity of the second pole piece 20 is opposite to that of the first pole piece 10, a diaphragm 30 disposed between the first pole piece 10 and the second pole piece 20, the first pole piece 10, the second pole piece 20 and the diaphragm 30 are wound or laminated; a temperature sensor 40 disposed on at least one of the first pole piece 10, the second pole piece 20 and the diaphragm 30, and the temperature sensor 40 is used to detect the temperature of at least one of the first pole piece 10, the second pole piece 20 and the diaphragm 30 and output a signal.

[0034] Applying the technical solution of the present utility model, a temperature sensor 40 is disposed on at least one of the first pole piece 10, the second pole piece 20 and the diaphragm 30. In this way, when thermal runaway occurs during the use of the battery, the temperature sensor 40 can timely monitor the abnormal temperature of the battery, thereby improving the safety of the battery pack during operation.

[0035] In this application, X is the first direction and Y is the second direction.

[0036] Meanwhile, the temperature sensor 40 in the present application includes a positioning unit 41, a collection unit 42, and a conversion unit 43. The function of the positioning unit 41 is as follows: after collecting the dimension information of the first electrode tab 10 or the second electrode tab 20, it calculates the number of temperature sensors 40 that can be configured for this type of first electrode tab 10 or second electrode tab 20 based on the dimensions of the first electrode tab 10 or the second electrode tab 20 at the maximum level. At the same time, it determines the dimension specifications of the temperature sensor 40, and then manufactures the positioning unit 41 to ensure the consistency of this batch of temperature sensors 40;

[0037] The function of the temperature signal collection unit 42 is: this unit is used to collect the temperature inside the battery and store and transmit it to the temperature signal conversion unit 43;

[0038] The temperature signal conversion unit 43: this unit is used to convert the collected temperature signal, convert the temperature signal into visual data, transmit it to the transmission member 50, and then transmit it by the transmission member 50 to the outside of the battery for analysis and processing, which is used for on-line monitoring and analysis of the temperature inside the battery.

[0039] In an embodiment, a first sinking groove is provided on the surface of the first electrode tab 10 and / or the second electrode tab 20, and the temperature sensor 40 is arranged in the first sinking groove.

[0040] In an embodiment, the first electrode tab 10 and / or the second electrode tab 20 includes a current collector layer and an active layer. The active layer is arranged on one side of the current collector layer, and a first sinking groove 61 is provided in the active layer. The temperature sensor 40 is arranged in the first sinking groove 61. With this setting, the space of the first electrode tab 10 and / or the second electrode tab 20 is reasonably utilized, and the temperature sensor 40 does not occupy additional installation space, which is conducive to the miniaturization development of the first electrode tab 10 and / or the second electrode tab 20.

[0041] Meanwhile, the current collector layer is the part in the electrode for collecting and transmitting current, and it needs to be in close contact with the active layer to effectively collect current. Common current collector layer materials include: Copper foil: Commonly used as the negative current collector in batteries because of its good conductivity, moderate cost, and easy processing. Aluminum foil: Commonly used as the positive current collector in lithium-ion batteries because of its good conductivity, soft texture, and low cost. Nickel sheet, nickel foam, and titanium sheet: These materials also have good conductivity and mechanical strength and can be used as electrode current collectors under specific conditions. Composite current collectors: Such as PET copper foil, PET aluminum foil, etc., which are made by plating copper or aluminum on a polymer base film, and have the advantages of being thin, highly conductive, and having good mechanical strength. The active layer is the main part where electrochemical reactions occur in the electrode, and the selection of its material directly determines the performance of the electrochemical device. Common active layer materials include: Carbon materials: Such as activated carbon, carbon nanotubes, graphene, etc., which have a high specific surface area and good conductivity, and are commonly used in the active layer of supercapacitors. Metal oxides: Such as ruthenium oxide, manganese oxide, nickel oxide, etc., which can undergo reversible redox reactions under specific electrochemical conditions to store and release energy. Conductive polymers: Such as polypyrrole, polyaniline, etc., which not only have good conductivity but also can be chemically modified to adjust their electrochemical properties. Composite materials: Composed of carbon materials, metal oxides, and conductive polymers, etc., to combine their respective advantages and improve electrochemical performance.

[0042] In one embodiment, a second sink 62 is provided on one side of the separator 30, and the temperature sensor 40 is disposed in the second sink 62. With this arrangement, the space of the separator 30 is reasonably utilized, and the temperature sensor 40 does not occupy additional installation space, which is conducive to the miniaturization development of the separator 30.

[0043] In one embodiment, the electrode assembly further includes a transmission member 50 connected to the temperature sensor 40. The transmission member 50 is used for communication connection with an external communication component to receive the signal output by the temperature sensor 40 and transmit the signal to the external communication component. With this arrangement, users can monitor the operating state of the battery module in a timely manner to improve the stability of the battery module during operation.

[0044] In one embodiment, at least one of the first electrode 10, the second electrode 20, and the separator 30 is provided with a third sink 63, and the transmission member 50 is disposed in the third sink 63. With this arrangement, the space of the first electrode 10, the second electrode 20, and the separator 30 is reasonably utilized, and the transmission member 50 does not occupy additional installation space, which is conducive to the miniaturization development of the first electrode 10, the second electrode 20, and the separator 30.

[0045] In one embodiment, the electrode assembly includes a plurality of temperature sensors 40, and the plurality of temperature sensors 40 are arranged in an array on at least one of the first electrode 10, the second electrode 20, and the separator 30. With such an arrangement, it is possible to allow the plurality of temperature sensors 40 to work simultaneously, thereby achieving parallel operation and improving the overall monitoring efficiency. At the same time, the array arrangement adopts a compact design method, arranging the plurality of temperature sensors 40 closely together, so that the required installation space can be saved and the space utilization rate can be improved.

[0046] In one embodiment, the distance between two adjacent temperature sensors 40 in the first direction is L1, where 4 mm ≤ L1 ≤ 25 mm, and the first direction is the length direction of the first electrode 10. When L1 > 25 mm, the distance between two adjacent temperature sensors 40 is too far. Since the areas of the first electrode 10, the second electrode 20, and the separator 30 are fixed, this will reduce the number of temperature sensors 40 arranged and also reduce the monitoring area of the temperature sensors 40, thereby reducing the accuracy of the device during monitoring. When L1 < 4 mm, the distance between two adjacent temperature sensors 40 is too small, which may cause signal interference between the temperature sensors 40, thereby reducing the stability of the device when monitoring temperature. Therefore, setting 4 mm ≤ L1 ≤ 25 mm can not only ensure the number of temperature sensors 40 arranged, improve the monitoring area of the temperature sensors 40, which is beneficial to ensuring the accuracy of the device during monitoring, but also prevent signal interference between the temperature sensors 40, thereby improving the stability of the device when monitoring temperature. Optionally, L1 can be set to values such as 4 mm, 15 mm, or 25 mm, etc. The specific setting should be selected according to the usage environment of the temperature sensors 40 and will not be specifically limited here.

[0047] In one embodiment, the spacing between two adjacent temperature sensors 40 in the second direction is L2, where 1 mm ≤ L2 ≤ 5 mm, and the second direction is the width direction of the first pole piece 10. When L2 > 25 mm, the distance between two adjacent temperature sensors 40 is too far. Since the areas of the first pole piece 10, the second pole piece 20, and the separator 30 are fixed, this will reduce the number of temperature sensors 40 provided, and at the same time reduce the monitoring area of the temperature sensors 40, thereby reducing the accuracy during the monitoring of the device. When L2 < 4 mm, the distance between two adjacent temperature sensors 40 is too small, which may cause signal interference between the temperature sensors 40, thereby reducing the stability of the device when monitoring the temperature. Therefore, setting 4 mm ≤ L2 ≤ 25 mm can not only ensure the number of temperature sensors 40 provided, increase the monitoring area of the temperature sensors 40, which is beneficial to ensuring the accuracy during the monitoring of the device, but also prevent signal interference between the temperature sensors 40, thereby increasing the stability of the device when monitoring the temperature. Optionally, L2 can be set to values such as 4 mm, 15 mm, or 25 mm, etc. The specific setting should be selected according to the usage environment of the temperature sensors 40, and no specific limitation is made here.

[0048] Optionally, the relationship between L1 and L2 is not specifically limited in this application, and the setting should be selected according to the monitoring requirements of the user, so as to improve the applicability and scope of temperature monitoring.

[0049] In one embodiment, an insulating coating is provided on the surface of the temperature sensor 40. This can ensure the stable operation of the temperature sensor 40 and avoid being corroded by the electrolyte at the same time.

[0050] In this application, the main component of the insulating coating is an aromatic heterocyclic polymer compound with an imide group link in its molecular structure, which has excellent mechanical properties, electrical insulation properties, radiation resistance properties, high temperature resistance, wear resistance, and corrosion resistance properties.

[0051] In one embodiment, the material of the insulating coating includes at least one of polyimide, poly(m-phenyleneisophthalamide), polyetherimide, and polyamide-imide.

[0052] In one embodiment, the transmission member 50 includes an optical fiber. The optical fiber can detect very small physical quantity changes, which benefits from the high sensitivity characteristics of light waves when transmitting in the optical fiber. The optical fiber itself is composed of a dielectric and is non-conductive. Therefore, the optical fiber will not be affected by electromagnetic interference when working in an electromagnetic environment. This makes the optical fiber particularly suitable for measurements in strong electromagnetic field environments, such as power systems, communication systems, etc. And the optical fiber has good electrical insulation properties and can work safely and reliably in environments with high voltage and high electric fields. This enables the optical fiber to maintain stable operation.

[0053] Furthermore, the main material of the optical fiber is quartz glass, which has extremely high chemical stability and can resist the erosion of various corrosive substances. Therefore, optical fibers are particularly suitable for long-term stable measurements in harsh environments. This can extend the service life of the optical fiber and reduce the usage cost of the device. Optical fibers are small in size and light in weight, which makes them easy to install and deploy in various devices without imposing an additional burden on the devices. At the same time, as a transmission medium, optical fibers have extremely low transmission loss and extremely high transmission capacity, enabling long-distance and high-quality signal transmission. This gives optical fibers significant advantages in fields such as remote monitoring and distributed measurement. Optical fibers have the ability of distributed measurement, that is, distributed measurement of multiple measurement points can be achieved on a single optical fiber. This further reduces the monitoring cost. And optical fibers can be seamlessly connected to computers and optical fiber transmission systems to achieve real-time acquisition, processing, and analysis of data. This helps to improve the automation level and intelligence level of the system.

[0054] Of course, in other embodiments of the present application, the transmission member 50 can also be set as an RFID (Radio Frequency Identification) electronic tag, also known as a radio frequency identification tag or a wireless radio frequency identification tag, which is a non-contact automatic identification technology. It automatically identifies the target object through radio frequency signals and obtains relevant data. The identification process does not require manual intervention and can work in various harsh environments. The main features of the RFID electronic tag: Non-contact identification: The RFID electronic tag does not need to be in contact with the identification device to read or write data, which makes the operation more convenient. Fast identification: The RFID technology can identify multiple tags simultaneously, greatly improving the speed and efficiency of identification. Strong penetration: The RFID signal can penetrate non-metallic or non-transparent materials such as paper, wood, and plastic for identification. Strong environmental adaptability: The RFID technology can work in various harsh environments, such as high temperature, high humidity, oil pollution, etc. High security: The RFID technology has an encryption function to prevent data from being tampered with or forged. Classification of RFID electronic tags: Classified by power supply method: Passive (passive) RFID electronic tag: It does not have a battery inside and is powered and communicates by receiving the microwave signal sent by the reader. Active (active) RFID electronic tag: It has a battery inside and can actively send radio frequency signals to the reader for communication.

[0055] In a second aspect, an embodiment of the present invention provides a battery module, and the battery module includes the above-mentioned pole piece assembly.

[0056] Applying the technical solution of the present utility model, a temperature sensor 40 is provided on at least one of the first electrode sheet 10, the second electrode sheet 20 and the separator 30. In this way, when thermal runaway occurs during the use of the battery, the temperature sensor 40 can timely monitor the abnormal temperature of the battery, thereby improving the safety of the battery pack during operation.

[0057] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0059] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as limiting the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0060] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0061] In addition, it should be noted that using terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statement, the above terms have no special meanings, and thus cannot be construed as limiting the protection scope of the present utility model.

[0062] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A pole piece assembly, characterized in that, The electrode assembly includes: A first electrode; A second electrode, the second electrode having a polarity opposite to that of the first electrode; A separator disposed between the first electrode and the second electrode, the first electrode, the second electrode, and the separator being wound or laminated; A temperature sensor disposed on at least one of the first electrode, the second electrode, and the separator, the temperature sensor being configured to detect the temperature of at least one of the first electrode, the second electrode, and the separator and output a signal.

2. The pole piece assembly according to claim 1, wherein, A first sink is provided on the surface of the first electrode and / or the second electrode, and the temperature sensor is disposed in the first sink.

3. The pole piece assembly according to claim 2, characterized in that, The first electrode and / or the second electrode includes a current collector layer and an active layer, the active layer being disposed on one side of the current collector layer, and the active layer having the first sink.

4. The electrode sheet assembly according to claim 1, characterized in that, A second sink is provided on one side of the separator, and the temperature sensor is disposed in the second sink.

5. The electrode sheet assembly according to claim 4, characterized in that, The electrode assembly further includes a transmission member connected to the temperature sensor, the transmission member being configured to communicate with an external communication component to receive the signal output by the temperature sensor and transmit the signal to the external communication component.

6. The pole piece assembly according to claim 5, characterized in that, A third sink is provided on at least one of the first electrode, the second electrode, and the separator, and the transmission member is disposed in the third sink.

7. The pole piece assembly according to any one of claims 1-6, characterized in that, The electrode assembly includes a plurality of the temperature sensors, and the plurality of temperature sensors are arranged in an array on at least one of the first electrode, the second electrode, and the separator.

8. The pole piece assembly according to claim 7, wherein, The distance between two adjacent temperature sensors in a first direction is L1, 4 mm ≤ L1 ≤ 25 mm, and the first direction is the length direction of the first electrode.

9. The electrode sheet assembly according to claim 7, wherein The distance between two adjacent temperature sensors in a second direction is L2, 1 mm ≤ L2 ≤ 5 mm, and the second direction is the width direction of the first electrode.

10. The electrode sheet assembly according to claim 1, characterized in that, An insulating coating is provided on the surface of the temperature sensor.

11. The electrode sheet assembly according to claim 10, characterized in that, The material of the insulating coating includes at least one of polyimide, poly(metaphenylene isophthalamide), polyetherimide, and polyamide-imide.

12. The pole piece assembly according to claim 5, wherein, The transmission member includes an optical fiber.

13. A battery module, characterized in that, The battery module includes the electrode assembly according to any one of claims 1-12.

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