Single cell and battery equipment
By using an insulating film to cover the acquisition device in a single battery cell, the problem of the acquisition module being easily damaged during high-voltage testing was solved, and normal performance and production efficiency were improved after high-voltage testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- EVE POWER CO LTD
- Filing Date
- 2026-05-28
- Publication Date
- 2026-06-30
Smart Images
Figure CN122315291A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of battery manufacturing technology, and more particularly to a single battery cell and battery equipment. Background Technology
[0002] With the development of IoT technology, the application of individual battery cells integrating data acquisition modules is becoming increasingly widespread. These modules rely on the battery cell itself for power to achieve real-time monitoring of cell parameters such as voltage and temperature. During production, high-voltage testing is essential to ensure the insulation safety of individual battery cells. Current manufacturing processes typically connect the data acquisition module to the individual battery cell first, followed by encapsulation and high-voltage testing. However, during high-voltage testing, the high voltage applied between the battery cell's tabs and the casing can cause breakdown and damage to the semiconductor devices inside the acquisition module, leading to defects in the entire battery cell and severely impacting production yield and manufacturing costs. Summary of the Invention
[0003] The present invention provides a single-cell battery and battery device to solve at least one of the problems mentioned in the background art.
[0004] The single-cell battery according to the embodiments of this application includes a housing, an electrode assembly, a data acquisition device, and an insulating film. The electrode assembly is disposed inside the housing. The data acquisition device is located inside the housing and electrically connected to the electrode assembly for acquiring parameters of the single-cell battery. The insulating film covers at least a portion of the data acquisition device and is soluble when in contact with an electrolyte, so that the data acquisition device is at least partially exposed to the internal environment of the housing.
[0005] In the single-cell battery of this application embodiment, the insulating film covers at least a portion of the data acquisition device. During high-voltage testing of the single-cell battery, the high voltage of the high-voltage test cannot break down the sensitive elements of the data acquisition device due to the insulating effect of the insulating film, effectively preventing the high voltage from affecting the data acquisition device or even causing it to fail. This ensures the normal performance of the single-cell battery after high-voltage testing. Furthermore, when electrolyte is injected into the single-cell battery, the electrolyte dissolves at least a portion of the insulating film, exposing at least a portion of the data acquisition device to the internal environment of the casing. This avoids the influence of the insulating film on the data acquisition device, enabling the data acquisition device to accurately acquire information from inside the single-cell battery. The partial dissolution of the insulating film can be achieved simultaneously with electrolyte injection, eliminating the need for a separate dissolution process for the insulating film. This effectively controls the overall production time and improves production efficiency.
[0006] In some embodiments, the insulating film completely covers the surface of the acquisition device.
[0007] In the above embodiments, the insulating film completely covers the surface of the acquisition device, and the acquisition device is completely isolated from the external environment, which can ensure the insulation of the acquisition device to the greatest extent and effectively prevent high voltage breakdown.
[0008] In some embodiments, the ratio of the surface area of the insulating film dissolved by the electrolyte to the surface area of the acquisition device is ≥0.4.
[0009] In the above embodiment, the insulating film completely covers the surface of the acquisition device. When electrolyte is injected into the cell, at least 40% of the surface area of the insulating film can come into contact with the electrolyte and dissolve, ensuring that the acquisition device accurately acquires information from inside the cell.
[0010] In some embodiments, the insulating film is made of a polymer that can be dissolved by the electrolyte.
[0011] In the above embodiments, the insulating film is made of a high molecular polymer that can be dissolved by the electrolyte. When the electrolyte is injected into the single cell, the electrolyte reacts with the insulating film and dissolves it. In this way, the insulating film can react and dissolve immediately upon contact with the electrolyte. The dissolution method is reliable and does not require additional steps to dissolve the insulating film, which reduces the overall production complexity and can effectively improve production efficiency.
[0012] In some embodiments, the insulating film includes at least one of a polyamide film and a polyethylene film.
[0013] In the above embodiments, the insulating film material is readily available and low in cost, which can effectively reduce the overall manufacturing cost of a single battery cell.
[0014] In some embodiments, the thickness of the insulating film ranges from 0.01 mm to 0.5 mm.
[0015] In the above embodiments, the thickness range of the insulating film is set to 0.01mm~0.5mm, which ensures both the rapid dissolution of the insulating film and the high voltage protection of the acquisition device. By controlling the amount of material used, the cost is further controlled.
[0016] In some embodiments, the insulating film can withstand a voltage ≥200V.
[0017] In the above embodiments, the withstand voltage characteristic of the insulating film of not less than 200V can ensure the safety of the data acquisition device when performing high voltage tests on individual battery cells.
[0018] In some embodiments, the insulation resistance of the insulating film is >2MΩ.
[0019] In the above embodiments, the insulation resistance of the insulating film is >2MΩ, which further ensures the safety of the data acquisition device when performing high-voltage testing on individual battery cells.
[0020] In some embodiments, the acquisition device is used to acquire the voltage, current, temperature of the individual battery cell and the air pressure inside the casing.
[0021] In the above embodiments, the acquisition device can collect various information from a single battery cell, thus enabling the acquisition device to have a high degree of integration.
[0022] In some embodiments, the housing includes a body and a cover plate detachably connected to the body, with the collection device disposed on the cover plate.
[0023] In the above embodiments, the acquisition device is set on the cover plate. When the cover plate is installed to the housing, the acquisition device can be installed together, which is beneficial to improving installation efficiency and effectively utilizing the space occupied by the individual battery cell, thereby improving the structural compactness of the individual battery cell.
[0024] In some embodiments, the cover plate has a liquid injection hole that penetrates the cover plate, and the liquid injection hole and the collection device at least partially overlap in the thickness direction of the cover plate.
[0025] In the above embodiments, the structure of the injection hole is simple, and the method of injecting electrolyte through the injection hole is simple and reliable. When the electrolyte is injected into the shell, it can contact at least part of the insulating film on the surface of the collection device. By reasonably setting the relative positional relationship between the injection hole and the collection device, it is ensured that at least part of the insulating film is dissolved.
[0026] This application also provides a battery device including a plurality of individual cells according to any of the above embodiments.
[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of the present invention; Figure 2 This is a structural schematic diagram of a single battery cell according to another perspective of an embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of the data acquisition device according to an embodiment of the present invention.
[0029] Explanation of reference numerals in the attached figures: 100-Single cell, 10-Housing shell, 11-Body, 12-Cover plate, 121-Injection hole, 20-Electrode assembly, 30-Collection device, 40-Insulating film, 50-Explosion-proof valve. Detailed Implementation
[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote 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 exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0034] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0035] Please see Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a partial structural schematic diagram of the single battery cell 100 according to an embodiment of the present invention. Figure 2 This is a structural schematic diagram of the single battery cell 100 according to another perspective of an embodiment of the present invention. Figure 3 This is a cross-sectional schematic diagram of the data acquisition device 30 according to an embodiment of the present invention.
[0036] The single-cell battery 100 of this application includes a housing 10, an electrode assembly 20, a data acquisition device 30, and an insulating film 40. The electrode assembly 20 is disposed inside the housing 10. The data acquisition device 30 is located inside the housing 10 and is electrically connected to the electrode assembly 20 for acquiring parameters of the single-cell battery 100. The insulating film 40 covers at least a portion of the data acquisition device 30 and is soluble when in contact with the electrolyte, so that the data acquisition device 30 is at least partially exposed to the internal environment of the housing 10.
[0037] In the single-cell battery 100 of this application embodiment, the insulating film 40 covers at least a portion of the data acquisition device 30. During high-voltage testing of the single-cell battery 100, the high voltage of the high-voltage test cannot break down the sensitive element of the data acquisition device 30 due to the insulating effect of the insulating film 40, effectively preventing the high voltage from affecting the data acquisition device 30 or even causing the data acquisition device 30 to fail, ensuring the normal performance of the single-cell battery 100 after high-voltage testing. Furthermore, when electrolyte is injected into the single-cell battery 100, the electrolyte dissolves at least a portion of the insulating film 40, so that the data acquisition device 30 is at least partially exposed to the internal environment of the housing 10, avoiding the influence of the insulating film 40 on the data acquisition device 30. The data acquisition device 30 can achieve accurate acquisition of information inside the single-cell battery 100. At least a portion of the insulating film 40 can be dissolved at the same time as the electrolyte is injected, eliminating the need for a separate dissolution process of the insulating film 40, effectively controlling the overall production time, and improving production efficiency.
[0038] Specifically, the casing 10 of the single-cell battery 100 is an outer cover encapsulating the internal materials of the single-cell battery 100, such as the positive electrode, negative electrode, and electrolyte. As a fundamental component of the single-cell battery 100 structure, the casing 10 provides a fixed physical space for the internal electrode assembly 20 and the collection device 30, while isolating the internal environment of the single-cell battery 100 from the external environment, preventing air and moisture leakage and electrolyte leakage. Furthermore, the casing 10 is effectively resistant to electrolyte corrosion, ensuring the normal operation of the single-cell battery 100 and preventing environmental pollution and harm to the human body. For example, the casing 10 can be an aluminum casing, a steel casing, etc. The electrode assembly 20 is the core reaction unit of the single-cell battery 100, composed of positive electrode, negative electrode, and separator combined by winding or stacking. Through a reversible chemical reaction, the electrode assembly 20 realizes the external work of electrons and the migration of lithium ions, directly determining the capacity, voltage, and output power of the single-cell battery 100.
[0039] The data acquisition device 30 in this embodiment is a miniaturized electronic unit integrated inside the individual battery cell 100 for real-time sensing and acquisition of the operating status information of the individual battery cell 100. The data acquisition device 30 is pre-installed below the liquid injection hole 121 of the housing of the individual battery cell 100, establishes a permanent electrical connection with the positive and negative terminals, and includes at least one functional sensor that needs to be exposed to the internal environment of the housing 10, such as a barometric pressure sensor, to provide a data foundation for the safety monitoring, status assessment, and intelligent management of the individual battery cell 100. The insulating film 40 is a thin solid coating layer covering the surface of the data acquisition device 30, which has the characteristics of electrical insulation and being dissolvable by electrolyte.
[0040] During the manufacturing stage of the single cell 100, the insulating film 40 on the surface of the acquisition device 30 provides physical isolation for the acquisition device 30, which can avoid damage to the acquisition device 30 that may be caused during the early manufacturing process to a certain extent. When the single cell 100 is subjected to high voltage testing, due to the insulating effect of the insulating film 40, the high voltage cannot be directly applied to the acquisition device 30, which can protect the sensitive components of the acquisition device 30 from damage. In this way, the structural and performance safety of the acquisition device 30 during the high voltage testing process of the single cell 100 can be ensured, and the acquisition device 30 located inside the housing 10 of the single cell 100 can still operate efficiently and accurately after the high voltage testing of the single cell 100.
[0041] In the electrolyte injection process of the single battery cell 100, the electrolyte injected into the casing of the single battery cell 100 comes into direct contact with the insulating film 40 on the surface of the acquisition device 30 located inside the casing. Due to the soluble nature of the insulating film 40 in the electrolyte, when the insulating film 40 comes into contact with the electrolyte during injection, the electrolyte causes the insulating film 40 to begin dissolving. Ultimately, the sensitive element of the acquisition device 30 is exposed to the internal environment of the single battery cell 100, and the functional sensor on the acquisition device 30, covered by the insulating film 40, begins to work normally, realizing the accurate acquisition and transmission of information about the internal environment of the single battery cell 100. The injection of electrolyte and the dissolution of the insulating film 40 are basically synchronized, making full use of the electrolyte injection time of the single battery cell 100 and effectively improving the overall production efficiency.
[0042] In some embodiments of this application, after the liquid injection is completed, a portion of the insulating film 40 remains covering a portion of the surface of the acquisition device 30. It should be noted that the portion of the acquisition device 30 covered by the insulating film 40 does not affect the operation of the functional sensors at the corresponding positions on the acquisition device 30; that is, the operation of the sensors on the acquisition device 30 corresponding to the undissolved portion of the insulating film 40 is not affected by the insulating film 40.
[0043] In some embodiments, during the manufacturing stage of the insulating film 40 covering the acquisition device 30, the insulating film 40 may cover a portion of the surface of the acquisition device 30. After liquid injection is completed, the insulating film 40 may be completely dissolved or partially retained. It should be noted that by using the method of the insulating film 40 only covering a portion of the surface of the acquisition device 30, the insulating film 40 can still protect the sensitive elements on the acquisition device 30 during high-voltage testing of the single cell 100, achieving high-voltage protection with a smaller coverage area.
[0044] Thus, by covering the surface of the acquisition device 30 with the insulating film 40, the acquisition device 30 is protected from high voltage during the high voltage test of the single cell 100, preventing high voltage from damaging the acquisition device 30. It also avoids the influence of the insulating film 40 on the acquisition device 30 after the high voltage test, ensuring the normal operation of the acquisition device 30 after the high voltage test.
[0045] Please see Figure 3 In some embodiments, the insulating film 40 completely covers the surface of the acquisition device 30.
[0046] In the above embodiment, the insulating film 40 completely covers the surface of the acquisition device 30, and the acquisition device 30 is completely isolated from the external environment, which can ensure the insulation of the acquisition device 30 to the greatest extent and effectively prevent high voltage breakdown.
[0047] Specifically, the insulating film 40 completely covers the surface of the data acquisition device 30, meaning that the insulating film 40 completely covers the entire outer surface of the data acquisition device 30 in a three-dimensional manner, achieving complete coverage of the surface of the data acquisition device 30. There are no exposed areas on the surface of the data acquisition device 30, ensuring complete isolation between the data acquisition device 30 and the internal environment of the individual battery cell 100 during the early stages of manufacturing. For example, a sealed insulating film 40 can be applied to the surface of the data acquisition device 30 manually or automatically. The pressure sensor of the data acquisition device 30 can be located at any position on the surface of the data acquisition device 30. Alternatively, the insulating film 40 can be applied to the data acquisition device 30 through impregnation, coating, or other methods. The pressure sensor can be positioned on the data acquisition device 30 directly below the injection hole 121. During injection, the portion of the insulating film 40 directly below the injection hole 121 first contacts the electrolyte and begins to dissolve, ensuring that the pressure sensor at the corresponding position is exposed after the insulating film 40 dissolves, thus ensuring that the data acquisition device 30 can successfully acquire pressure information.
[0048] As a complete physical barrier, the insulating film 40 protects the entire data acquisition device 30 from mechanical damage and dust contamination during the early stages of manufacturing the individual battery cell 100. During high-voltage testing of the individual battery cell 100, the insulating film 40's insulation properties block all discharge paths, isolating the entire acquisition device and effectively preventing it from being broken down by high voltage. Furthermore, the complete encapsulation method simplifies the process of covering the data acquisition device 30 with the insulating film 40, eliminating the need for precise positioning of the encapsulation area, thus improving operational efficiency and reducing production costs.
[0049] Please see Figure 3 In some embodiments, the ratio of the surface area of the insulating film 40 dissolved by the electrolyte to the surface area of the collection device 30 is ≥0.4.
[0050] In the above embodiment, the insulating film 40 completely covers the surface of the acquisition device 30. When electrolyte is injected into the cell 100, at least 40% of the surface area of the insulating film 40 can contact the electrolyte and dissolve, ensuring that the acquisition device 30 accurately acquires the information inside the cell 100.
[0051] Specifically, when the insulating film 40 completely covers the surface of the acquisition device 30, the surface area of the insulating film 40 that is dissolved by the electrolyte is the surface area of the part of the insulating film 40 that actually contacts the electrolyte during the electrolyte injection process. The insulating film 40 dissolves at the same time as it comes into contact with the electrolyte, and finally exposes the surface of the acquisition device 30 that was originally covered by the dissolved part of the insulating film 40 to the internal environment of the single cell 100. The surface area of the acquisition device 30 is the sum of the areas of all the outer surfaces of the acquisition device 30. When the acquisition device 30 is completely covered by the insulating film 40, the surface area of the insulating film 40 before it begins to dissolve by the electrolyte is almost equal to the surface area of the acquisition device 30.
[0052] The ratio of the surface area of the insulating film 40 dissolved by the electrolyte to the surface area of the acquisition device 30 is ≥0.4. That is, the ratio of the surface area of the insulating film 40 dissolved by the electrolyte to the total surface area of the insulating film 40 before it begins to be dissolved by the electrolyte is ≥0.4. For example, this ratio can be 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, etc. In this way, the electrolyte can contact a sufficient amount of the surface area of the insulating film 40, so that the key parts of the acquisition device 30 are exposed to the internal environment of the single cell 100. This prevents the insulating film 40 from covering the key parts and affecting the acquisition accuracy of the acquisition device 30, ensuring that the acquisition device 30 accurately acquires information from the single cell 100, and providing a guarantee for the normal operation of the acquisition device 30 of the single cell 100 after electrolyte injection.
[0053] In one embodiment of this application, the main component of the electrolyte solvent is a carbonate polymer, and the main component of the insulating film 40 is polyethylene. Carbonate groups are grafted onto its main chain to improve its solubility in the electrolyte solvent. The polymer material constituting the insulating film 40 contains a mass percentage or molar percentage of carbonate structural units ≤10%. For example, its proportion can be 10%, 9.75%, 9.5%, 9.25%, 9%, 8.75%, 8.5%, 8.25%, 8%, 7.75%, 7.5%, 7.25%, 7%, etc. Furthermore, a small amount of side chains containing carbonate groups can be grafted onto its main chain. The carbonate groups in the insulating film 40, through similarity-to-miscibility and dipole interaction with the electrolyte solvent molecules, cause the polymer chains to gradually solubilize, dissociate, and disperse, thereby achieving dissolution and further improving the solubility of the insulating film 40 in the electrolyte solvent.
[0054] The electrolyte injection time is ≥110s, meaning the time required to complete the electrolyte injection process is greater than or equal to 110s. For example, the injection time can be 110s, 112s, 115s, 117s, 120s, 122s, 125s, 127s, 130s, etc. The insulating film 40 is dissolved at least partially by the electrolyte within an injection time of not less than 110s, exposing the key parts of the acquisition device 30. In this embodiment, the ratio of the surface area of the insulating film 40 dissolved by the electrolyte to the surface area of the sampling device 30 ranges from 40.5% to 42.5%. For example, the ratio can be 40.5%, 40.75%, 41%, 41.25%, 41.5%, 41.75%, 42%, 42.25%, or 42.5%. After the insulating film 40 is partially dissolved, the key parts of the sampling device 30 are exposed, ensuring its normal operation. Within this ratio range, the longer the injection time, the larger the corresponding ratio. It can be understood that after the insulating film 40 is dissolved to a certain extent, the ratio no longer changes with the extension of the injection time.
[0055] Please see Figure 3 In some embodiments, the insulating film 40 is made of a polymer that can be dissolved by an electrolyte.
[0056] In the above embodiments, the insulating film 40 is made of a polymer that can be dissolved by the electrolyte. When the electrolyte is injected into the single cell 100, the electrolyte reacts with the insulating film 40 and dissolves it. In this way, the insulating film 40 can react and dissolve immediately upon contact with the electrolyte. The dissolution method is reliable and does not require additional steps to dissolve the insulating film 40, which reduces the overall production complexity and can effectively improve production efficiency.
[0057] Specifically, the polymer that can be dissolved by the electrolyte is a polymer material that can undergo molecular chain dissociation and dispersion in the organic solvent of the electrolyte in the electrolyte of the single cell 100, thereby changing from a solid state to a dissolved state. When the electrolyte comes into contact with the insulating film 40, the solvent molecules of the electrolyte penetrate into the insulating film 40, causing the polymer chains of the insulating film 40 to dissociate and disperse. The insulating film 40 changes from a solid state to a dissolved state, releasing the coating effect on the corresponding area surface of the acquisition device 30. The dissolved polymer material is dispersed in the electrolyte and does not affect the performance of the single cell 100. In addition, due to the chemical reaction between the insulating film 40 and the electrolyte, the insulating film 40 cannot be restored after being dissolved, ensuring that the insulating film 40 on the surface of the acquisition device 30 can be reliably removed in one go.
[0058] Please see Figure 3 In some embodiments, the insulating film 40 includes at least one of a polyamide film and a polyethylene film.
[0059] In the above embodiments, the insulating film 40 is made of readily available and low-cost materials, which can effectively reduce the overall manufacturing cost of the single cell 100.
[0060] Specifically, the insulating film 40 can be an insulating film made of polyamide or polyethylene as a substrate, possessing good insulation properties and mechanical strength. The material of the insulating film 40 must ensure its insulation properties and solubility in the electrolyte. Electrolytes commonly used in lithium-ion batteries typically contain carbonate solvents. For polyamide insulating films 40 to dissolve in the electrolyte, the affinity between the insulating film 40 and the electrolyte solvent can be enhanced by introducing polar groups such as carbonate groups, thereby improving solubility. The polyethylene insulating film 40 can be a modified polyethylene film. Chemical modification can make the polyethylene insulating film 40 soluble in the electrolyte, such as grafting carbonate groups onto the polyethylene backbone, thus improving its solubility in the electrolyte.
[0061] Please see Figure 3 In some embodiments, the thickness of the insulating film 40 ranges from 0.01 mm to 0.5 mm.
[0062] In the above embodiment, the thickness range of the insulating film 40 is set to 0.01mm~0.5mm, which not only ensures the rapid dissolution of the insulating film 40, but also ensures the high voltage protection of the acquisition device 30 by the insulating film 40. By controlling the amount of material used, the cost is further controlled.
[0063] Specifically, the thickness of the insulating film 40 covering the surface of the acquisition device 30 is 0.01mm to 0.5mm. For example, the thickness of the insulating film 40 can be 0.01mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc. The withstand voltage of the insulating film 40 is related to the material type and thickness of the insulating film 40. For the same material, the greater the thickness of the insulating film 40, the better its insulation performance and the greater the maximum voltage it can withstand. The closer the thickness of the insulating film 40 is to 0.01mm, the faster its dissolution rate when in contact with the electrolyte. The closer the thickness of the insulating film 40 is to 0.5mm, the higher its withstand voltage. By controlling the thickness of the insulating film 40 within the range of 0.01mm to 0.5mm, the structural safety of the insulating film 40 during the early manufacturing process of the single cell 100 can be ensured, and the acquisition device 30 can be protected from breakdown during high-voltage testing. The insulating film 40 within this thickness range ensures that it can be dissolved by the electrolyte when it comes into contact with the electrolyte, exposing the functional sensors of the acquisition device 30, so as to enable the acquisition device 30 to accurately acquire the internal information of the single cell 100.
[0064] Please see Figure 3 In some embodiments, the insulating film 40 can withstand a voltage ≥200V.
[0065] In the above embodiment, the withstand voltage characteristic of the insulating film 40 of not less than 200V can ensure the safety of the acquisition device 30 when the single cell 100 is subjected to high voltage test.
[0066] Specifically, the insulating film 40 can withstand a voltage of ≥200V, meaning it can withstand at least 200V without breakdown. For example, the insulating film 40 can withstand voltages of 200V, 250V, 300V, 350V, 400V, 450V, 500V, etc., but not less than 200V. This ensures that during high-voltage testing, the insulating film 40 will not break down, preventing the data acquisition device 30 from being exposed to high voltage, effectively protecting the data acquisition device 30 from damage during high-voltage testing. During high-voltage testing of a single cell 100, the internal air gap and creepage distance of the single cell 100 bear most of the high-voltage stress, while the insulating film 40 only needs to withstand the remaining voltage and possible transient spikes. A withstand voltage of not less than 200V is sufficient to prevent the insulating film 40 from breaking down during high-voltage testing, while also providing a wide range of material selection for the insulating film 40, avoiding sacrificing solubility or increasing costs in pursuit of excessively high withstand voltage.
[0067] Please see Figure 3 In some embodiments, the insulation resistance of the insulating film 40 is >2MΩ.
[0068] In the above embodiment, the insulation resistance of the insulating film 40 is >2MΩ, which further ensures the safety of the acquisition device 30 when the single cell 100 is subjected to high voltage testing.
[0069] Specifically, the insulation resistance of the insulating film 40 is greater than 2MΩ, meaning that the insulating film 40 has a greater ability to impede current than 2MΩ. For example, the insulation resistance of the insulating film 40 can be 2MΩ, 3MΩ, 4MΩ, 5MΩ, 6MΩ, 7MΩ, 8MΩ, 9MΩ, 10MΩ, etc. The insulation resistance of the insulating film 40 is greater than 2MΩ, and the polymer material of the insulating film 40 in the embodiments of this application can meet this requirement. This can ensure a small leakage current of the insulating film 40 during high-voltage testing and meet the relevant test requirements. The higher the insulation resistance, the smaller the leakage current of the insulating film 40.
[0070] Please see Figures 1-3 In some embodiments, the acquisition device 30 is used to acquire the voltage, current, temperature and air pressure inside the housing 10 of the individual battery cell 100.
[0071] In the above embodiments, the acquisition device 30 can acquire various information from a single battery cell 100, thus enabling the acquisition device 30 to have a high degree of integration.
[0072] Specifically, the voltage of a single cell 100 is the potential difference between the positive and negative terminals of the single cell 100. The acquisition device 30 is connected to the electrode assembly 20. The acquisition device 30's acquisition of voltage information is not affected by the insulating film 40. By acquiring current information, the actual usable capacity of the single cell 100 is evaluated, and overcurrent damage to the single cell 100 is effectively prevented. The acquisition device 30 can acquire the temperature of the single cell 100 in real time, providing a control basis for the thermal management system.
[0073] After the high-voltage test of the individual battery cell 100, the insulating film 40 on the surface of the sampling device is dissolved by the electrolyte injected through the injection hole 121. The air pressure sensor on the surface of the sampling device can collect the air pressure inside the individual battery cell 100. In the event of an abnormal increase in air pressure, such as thermal runaway of the individual battery cell 100, the system can release pressure through the explosion-proof valve 50 to prevent the battery cell from bulging or exploding, thus achieving active safety protection. For example, the acquisition device 30 can also collect stress and strain information of the housing 10 of the individual battery cell 100 and provide timely feedback to the system when the individual battery cell 100 is compressed.
[0074] Please see Figure 1 and Figure 2 In some embodiments, the housing 10 includes a body 11 and a cover plate 12 detachably connected to the body 11, and the collection device 30 is disposed on the cover plate 12.
[0075] In the above embodiment, the acquisition device 30 is mounted on the cover plate 12. When the cover plate 12 is installed to the housing 10, the acquisition device 30 can be installed together, which is beneficial to improving the installation efficiency and effectively utilizing the space occupied by the single cell 100, thereby improving the structural compactness of the single cell 100.
[0076] Specifically, the body 11 of the housing 10 is the main container of the single cell 100, which is used to hold the electrode assembly 20 and the electrolyte. The cover plate 12 is a top sealing component that is detachably connected to the body 11 of the housing 10. For example, the cover plate 12 and the body 11 of the housing 10 can be fixed by welding, riveting or other means. The cover plate 12 and the body 11 together constitute a complete housing 10 structure.
[0077] The collection device 30 is mounted on the cover plate 12 and housed within the space formed by the cover plate 12 and the body 11. Precise positioning of the collection device 30 on the cover plate 12 ensures the corresponding position of the injection hole 121 and the collection device 30, allowing the electrolyte to precisely act on the protective film on the surface of the collection device 30 during injection. The collection device 30 and the cover plate 12 form an integrated assembly, which can be assembled or disassembled together with the cover plate 12, effectively improving overall assembly efficiency. During the manufacturing process of the single battery cell 100, the collection device 30 covered with the insulating film 40 can be first installed on the cover plate 12, and then the cover plate 12 can be installed onto the body 11 as a whole. This effectively simplifies the installation process and improves overall production efficiency.
[0078] Please see Figure 1 and Figure 2 In some embodiments, the cover plate 12 has an injection hole 121 that penetrates the cover plate 12, and the injection hole 121 and the collection device 30 at least partially overlap in the thickness direction of the cover plate 12.
[0079] In the above embodiments, the structure of the injection hole 121 is simple, and the method of injecting electrolyte through the injection hole 121 is simple and reliable. When the electrolyte is injected into the housing 10, it can contact at least part of the insulating film 40 on the surface of the collection device 30. By reasonably setting the relative positional relationship between the injection hole 121 and the collection device 30, it is ensured that at least part of the insulating film 40 is dissolved.
[0080] Specifically, the injection hole 121 is a through hole extending through the cover plate 12 along its thickness direction. After the individual battery cell 100 completes and passes the high-voltage test, the electrolyte is injected into the individual battery cell 100 through the injection hole 121 and wets the electrode assembly 20. During the electrolyte injection, the electrolyte comes into contact with the insulating film 40 on the surface of the acquisition device 30. The injection hole 121 and the acquisition device 30 overlap at least partially in the thickness direction of the cover plate 12, and the vertical projection of the injection hole 121 and the vertical projection of the acquisition device 30 overlap at least partially. When the electrolyte is injected into the individual battery cell 100 through the injection hole 121, the electrolyte in the injection hole 121 and the acquisition device 30 naturally flows onto at least a portion of the surface of the acquisition device 30 and dissolves the insulating film 40 in contact with it.
[0081] For example, the area of the overlapping portion of the injection hole 121 and the collection device 30 in the thickness direction of the cover plate 12 can be set according to the required exposure area of the collection device 30. For example, the larger the area of the overlapping portion of the injection hole 121 and the collection device 30 in the thickness direction of the cover plate 12, the larger the area of the insulating film 40 on the surface of the collection device 30 will be dissolved. In the embodiments of this application, the area of the overlapping portion of the injection hole 121 and the collection device 30 in the thickness direction of the cover plate 12 can ensure sufficient contact between the electrolyte and the insulating film 40, ensuring that the collection device 30 can accurately collect information from the individual battery cell 100.
[0082] This application also provides a battery device including a plurality of individual cells 100 according to any of the above embodiments.
[0083] In the above embodiments, the battery device composed of multiple individual cells 100 according to any of the above embodiments can avoid functional failure caused by direct high voltage during high-voltage testing by the acquisition device 30 inside the multiple individual cells 100 under the action of the insulating film 40. Moreover, the insulating film 40 can be dissolved by the electrolyte during the subsequent electrolyte injection process. In this way, the safety of the acquisition device 30 of the individual cells 100 of the battery device during high-voltage testing can be guaranteed, and the normal operation of the acquisition device 30 after the individual cells 100 have undergone high-voltage testing can also be guaranteed. This is conducive to ensuring the accurate acquisition and transmission of information by the battery device after high-voltage testing.
[0084] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0085] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A single battery cell, characterized in that, include: case; An electrode assembly, wherein the electrode assembly is disposed within the housing; A data acquisition device, located inside the housing and electrically connected to the electrode assembly, is used to acquire parameters of the individual battery cell; An insulating film covering at least a portion of the acquisition device, the insulating film being soluble upon contact with an electrolyte to expose at least partially the acquisition device to the internal environment of the housing.
2. The single-cell battery according to claim 1, characterized in that, The insulating film completely covers the surface of the acquisition device.
3. The single-cell battery according to claim 2, characterized in that, The ratio of the surface area of the insulating film dissolved by the electrolyte to the surface area of the acquisition device is ≥0.
4.
4. The single-cell battery according to claim 1, characterized in that, The electrolyte injection time is ≥110s.
5. The single-cell battery according to claim 1, characterized in that, The insulating film is made of a polymer that can be dissolved by the electrolyte.
6. The single-cell battery according to claim 5, characterized in that, The polymer contains ≤10% by mass or molar percentage of carbonate structural units.
7. The single-cell battery according to claim 5, characterized in that, The insulating film includes at least one of polyamide film and polyethylene film.
8. The single-cell battery according to any one of claims 1-7, characterized in that, The thickness of the insulating film ranges from 0.01 mm to 0.5 mm.
9. The single-cell battery according to any one of claims 1-7, characterized in that, The insulating film can withstand a voltage of ≥200V.
10. The single-cell battery according to any one of claims 1-7, characterized in that, The insulation resistance of the insulating film is >2MΩ.
11. The single-cell battery according to any one of claims 1-7, characterized in that, The data acquisition device is used to collect the voltage, current, temperature of the individual battery cell and the air pressure inside the casing.
12. The single-cell battery according to any one of claims 1-7, characterized in that, The housing includes a body and a cover plate detachably connected to the body, and the collection device is disposed on the cover plate.
13. The single-cell battery according to claim 12, characterized in that, The cover plate has a liquid injection hole that penetrates through the cover plate, and the liquid injection hole and the collection device at least partially overlap in the thickness direction of the cover plate.
14. A battery device, characterized in that, It includes any one of the single-cell battery cells as described in claims 1-13.