Battery cell and battery pack

Abstract

The utility model relates to battery technology field discloses a kind of battery cell and battery package.Electricity core includes: battery cell shell, at least one end along X direction has the opening being communicated with its inside;Cover plate, it is correspondingly arranged with opening and covers opening, and the outer surface of cover plate is equipped with functional area;Insulating adhesive layer, coating is in the outer circumferential surface of battery cell shell and the outer surface of cover plate, and the edge between the insulating adhesive layer on the outer surface of cover plate and the edge of functional area leaves gap a.The utility model replaces the insulating film of electricity core outer surface into insulating coating, can be realized comprehensive and even insulating protection by coating the insulating adhesive layer in the outer circumferential surface of battery cell shell and the outer surface of cover plate, effectively insulates the electrical interference and physical damage of external environment, can also avoid the problem that insulating film and structural glue appear bonding failure due to insufficient adhesion force.In addition, the gap a reserved between the edge of insulating adhesive layer on the outer surface of cover plate and the edge of functional area can avoid functional area, prevent insulating coating from covering or polluting functional area.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery cell and battery pack. Background Technology

[0002] New energy batteries are widely used in various fields such as transportation power supply, power storage power supply, new energy storage power supply, aerospace and military industry due to their advantages such as large capacity, high working voltage, strong charge retention capacity and long cycle life.

[0003] A battery pack typically consists of multiple battery cells, which are fixed inside the pack's casing. A battery cell generally includes a cover, casing, electrode assembly, electrode assembly end plates, bare cell insulating sheets, insulating film (blue film), and a cover plate patch. The cover is welded to the casing and forms a sealed space protecting the electrode assembly. The bare cell insulating sheets cover the electrode assembly to protect it and prevent short circuits caused by contact between the electrode assembly and the casing. The electrode assembly end plates secure the tabs and provide space for their protection. The insulating film (blue film) mainly covers the outside of the casing, providing external insulation.

[0004] In general, in order to ensure that multiple cells can be relatively firmly assembled inside the battery pack, structural adhesive is usually applied between two adjacent cells and between multiple cells and the inner wall of the battery pack, so as to bond and fix the cells inside the battery pack.

[0005] However, during the use of the battery pack, the bonding between the insulating film and the structural adhesive may fail due to insufficient adhesion, thus affecting the long-term reliability of the battery cells. Utility Model Content

[0006] In view of this, the present invention provides a battery cell and battery pack to solve the problem of bonding failure of the insulating film and structural adhesive on the outside of conventional battery cells due to insufficient adhesion.

[0007] In a first aspect, this utility model provides a battery cell, comprising: The battery cell casing has an opening communicating with its interior at at least one end along the X direction; A cover plate is provided corresponding to and covers the opening, and the outer surface of the cover plate is provided with functional areas; An insulating adhesive layer is applied to the outer peripheral surface of the cell housing and the outer surface of the cover plate, with a gap a between the edge of the insulating adhesive layer on the outer surface of the cover plate and the edge of the functional area.

[0008] Beneficial effects: Compared to conventional bonding using insulating film and structural adhesive, this invention replaces the insulating film on the outer surface of the battery cell with an insulating coating. This achieves comprehensive and uniform insulation protection through the insulating adhesive layer applied to the outer circumference of the battery cell casing and the outer surface of the cover plate, effectively isolating electrical interference and physical damage from the external environment. It also avoids bonding failure due to insufficient adhesion between the insulating film and the structural adhesive. Furthermore, the pre-reserved gap 'a' between the edge of the insulating adhesive layer on the outer surface of the cover plate and the edge of the functional area avoids the functional area, preventing the insulating coating from covering or contaminating it, thus ensuring the normal and stable operation of the corresponding functions.

[0009] In one alternative embodiment, the thickness of the insulating adhesive layer is 100 μm to 250 μm.

[0010] Beneficial effects: This invention sets the thickness of the insulating coating to 100μm to 250μm, which not only forms a sufficiently dense insulating barrier to effectively block the electrical connection between the cell casing and the external structure, but also avoids the increase in the overall volume and weight of the cell due to excessive coating thickness. This prevents additional space occupation within the battery pack or increased cell load, ensuring that the energy density of the battery pack is not significantly affected. Simultaneously, the suitable thickness makes it easier for the coating to form a uniform and stable film during adhesion, reducing potential localized insulation weaknesses caused by uneven thickness and further improving the reliability of insulation protection.

[0011] In one optional embodiment, the thickness of the insulating adhesive layer on the outer peripheral surface of the battery cell housing is 100 μm to 150 μm; the thickness of the insulating adhesive layer on the outer surface of the cover plate is 100 μm to 250 μm.

[0012] Beneficial effects: This utility model sets the thickness of the insulating adhesive layer on the outer periphery of the battery cell shell to 100μm to 150μm, which can provide reliable insulation protection for the battery cell shell, effectively blocking the electrical connection between the battery cell and the external structure, and avoid the redundancy of the overall volume of the battery cell caused by excessively thick insulating adhesive layer, thus ensuring the adaptability of the battery cell in the assembly space. Meanwhile, controlling the thickness of the insulating adhesive layer on the outer surface of the cover plate to 100μm to 250μm can form targeted insulation protection for the cover plate, enhance the electrical isolation effect between the cover plate and the external connectors, and at the same time, this thickness range can take into account the structural stability of the adhesive layer, reducing the impact of external friction and collision on the insulation performance of the cover plate.

[0013] In one optional implementation, the gap a ranges from 1mm ≤ a ≤ 1.5mm along the Y and / or Z directions.

[0014] Beneficial effects: Along the Y and / or Z directions, the gap a is controlled within 1mm ≤ a ≤ 1.5mm. This design ensures that the insulating adhesive layer has sufficient coverage width on the outer surface of the cover plate, avoiding a decrease in the insulation performance of the cover plate due to insufficient width of the insulating adhesive layer; at the same time, it avoids contamination of the functional areas on the cover plate due to excessively wide insulating adhesive layer.

[0015] In one alternative embodiment, the surface dyne value of the insulating adhesive layer is greater than 35 N / m.

[0016] Beneficial effects: The surface dyne value of the insulating adhesive layer is greater than 35 N / m, which can improve the wettability and adhesion of the insulating adhesive layer surface, so that the insulating adhesive layer can better adhere to the structural adhesive, enhance the adhesion between the two, and effectively reduce the peeling problem caused by insufficient adhesion.

[0017] In one alternative embodiment, the insulation resistance of the insulating adhesive layer is greater than 1 GΩ under a DC voltage of 500 volts.

[0018] Beneficial effects: The insulation resistance is greater than 1 GΩ under 500 volt DC voltage, ensuring that the insulating adhesive layer has good insulation performance, thereby effectively blocking current leakage and reducing the risk of short circuit.

[0019] In one alternative embodiment, the insulating adhesive layer has a flame retardancy rating of UL94V0.

[0020] Beneficial effects: The flame retardancy reaches UL94V0 level, meaning that the insulating layer can quickly self-extinguish when exposed to high temperatures or open flames, preventing the spread of fire and improving the safety performance of the battery cell. These characteristics work together to ensure the insulation reliability of the battery cell while also enhancing its structural stability and safety, providing comprehensive protection for the long-term stable operation of the battery cell.

[0021] In one alternative embodiment, the insulating adhesive layer is made of polyurethane acrylate.

[0022] Beneficial effects: Polyurethane acrylate has excellent adhesion properties, allowing it to adhere tightly to the outer periphery of the battery cell casing and the outer surface of the cover plate after coating. Furthermore, this material possesses strong chemical corrosion resistance and temperature resistance, enabling it to adapt to the complex environment inside the battery cell, resist electrolyte erosion and temperature fluctuations, extend the service life of the insulating adhesive layer, and thus improve the overall stability and durability of the battery cell.

[0023] Secondly, this utility model also provides a battery pack, comprising: Box; Multiple of the aforementioned battery cells are arranged side-by-side inside the housing; Structural adhesive is applied to the bottom surface of each of the battery cells and to opposite sides in the direction of the arrangement of the battery cells. The structural adhesive is bonded and fixed to the insulating adhesive layer to fix each of the battery cells to the housing.

[0024] Beneficial effects: Compared to bonding the insulating film with structural adhesive, bonding the insulating layer with structural adhesive creates a stable connection, ensuring the secure installation of the battery cells within the casing. This effectively resists external forces such as vibration and impact that the battery pack may experience during use, improving overall structural stability. Secondly, the compact and rational layout of multiple battery cells arranged side-by-side makes full use of the casing space. The application of structural adhesive not only reliably fixes the battery cells to the casing but also does not add excessive volume, contributing to the miniaturization design of the battery pack.

[0025] In one optional embodiment, the pull-out strength between the structural adhesive and the insulating adhesive layer is greater than or equal to 10 MPa; and / or, the shear strength between the structural adhesive and the insulating adhesive layer is greater than or equal to 10 MPa.

[0026] Beneficial effects: Higher pull-out strength effectively resists the tensile force of the battery cell in the direction perpendicular to the surface of the insulating adhesive layer, preventing peeling between the battery cell and the structural adhesive; while higher shear strength resists the shear force of the battery cell in the direction parallel to the surface of the insulating adhesive layer, preventing relative displacement of the battery cell under vibration, shaking, etc. This combination of strengths ensures more reliable fixation of the battery cell within the casing, maintaining the overall structural stability of the battery pack even under complex operating conditions and reducing potential failures caused by loose connections. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present invention from another perspective.

[0029] Explanation of reference numerals in the attached figures: 1. Cell housing; 2. Cover plate; 201. Terminal post; 202. Temperature sensing zone; 203. Explosion-proof valve; 3. Insulating adhesive layer. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] To address the problem of bonding failure between the insulating film and structural adhesive on the outside of conventional battery cells due to insufficient adhesion, this utility model provides a battery cell and a battery pack.

[0032] The following is combined with Figures 1 to 2 The following describes embodiments of the present invention.

[0033] According to an embodiment of the present invention, a battery cell is provided, comprising: a battery cell housing 1, a cover plate 2, and an insulating adhesive layer 3.

[0034] Specifically, the cell housing 1 has an opening at least one end along the X direction that communicates with its interior; the cover plate 2 is provided corresponding to the opening and seals the opening, and the outer surface of the cover plate 2 is provided with a functional area; the insulating adhesive layer 3 is coated on the outer peripheral surface of the cell housing 1 and the outer surface of the cover plate 2, and a gap a is left between the edge of the insulating adhesive layer 3 on the outer surface of the cover plate 2 and the edge of the functional area.

[0035] Compared to conventional bonding using insulating film and structural adhesive, this embodiment replaces the insulating film on the outer surface of the battery cell with an insulating coating. This achieves comprehensive and uniform insulation protection through the insulating adhesive layer 3 applied to the outer periphery of the battery cell housing 1 and the outer surface of the cover plate 2, effectively isolating electrical interference and physical damage from the external environment. It also avoids bonding failure due to insufficient adhesion between the insulating film and the structural adhesive. Furthermore, the pre-reserved gap 'a' between the edge of the insulating adhesive layer 3 on the outer surface of the cover plate 2 and the edge of the functional area avoids the functional area, preventing the insulating coating from covering or contaminating it, thus ensuring the normal and stable operation of the corresponding functions.

[0036] It should be noted that, to avoid unnecessary electrical connections between the cover plate 2 and the external structure, an insulating patch is usually applied to the surface of the cover plate 2. However, because conventional battery cells fold part of the insulating film onto the outer surface of the cover plate 2, unevenness of the insulating film often leads to problems such as the insulating patch lifting or falling off when it is applied to the cover plate 2. In contrast, the present invention achieves insulation isolation between the cover plate 2 and the external structure simply by applying an insulating coating. Therefore, compared with conventional solutions, the present invention not only avoids the problem of the insulating patch lifting or falling off, but also eliminates the need for the insulating patch and insulating film, reducing the number of structural components, simplifying the assembly process, and improving the battery cell production efficiency and yield.

[0037] It should be further explained that conventional insulating films generally consist of a substrate layer and an adhesive layer stacked together. The substrate layer is typically made of polyethylene terephthalate (PET) or polypropylene; the adhesive layer is made of acrylic adhesive. PET or polypropylene possesses good mechanical strength, insulation properties, and high-temperature resistance. Therefore, choosing PET or polypropylene as the substrate layer material ensures good strength, providing stable structural support for the adhesive layer, and also allows the insulating film to be well-suited to the working environment of the battery cell. Using acrylic adhesive as the adhesive layer leverages its excellent bonding properties to ensure a secure connection between the insulating film and the battery cell housing 1.

[0038] However, in actual use of the battery cell, it was found that the substrate layer and the adhesive layer also had peeling problems due to insufficient adhesion. Based on this, this embodiment of the utility model uses an insulating adhesive layer 3 to replace the insulating film on the outer surface of the battery cell. This not only retains the advantages of the substrate layer and adhesive layer in the insulating film in terms of insulation performance, high temperature resistance, and adhesion performance, but also avoids the delamination problem of the insulating film. The specific reasons are as follows: The insulating adhesive layer 3 in this embodiment is an integral structure in which the insulating material is sprayed onto the surface of the battery cell shell 1 using a UV spraying process (i.e., ultraviolet spraying process). It does not have a delamination structure like the substrate layer and adhesive layer in the insulating film. Therefore, there is no need to worry about peeling problems between different layers due to insufficient adhesion. It can avoid the occurrence of delamination problems from the structural root. At the same time, with the UV spraying process, it can ensure that the insulating adhesive layer 3 and the battery cell shell 1 form a tight bond, improving the durability and reliability of the battery cell's insulation protection.

[0039] Furthermore, to ensure that the insulation withstand voltage performance and flame retardant performance of the battery cell do not decrease after the insulation film is replaced, the insulation withstand voltage performance and flame retardant performance of the insulation adhesive layer 3 in this embodiment cannot be lower than the performance of the insulation film.

[0040] For example, the test process for the insulation withstand voltage performance of the insulating adhesive layer 3 is as follows: Under the test conditions of DC voltage of volts and 2 seconds, check whether the leakage current can be controlled within 1mA.

[0041] Furthermore, the application of insulating adhesive layer 3 to the outer surface of the battery cell in this embodiment has at least the following advantages: 1. The coating thickness and size can be flexibly adjusted as needed. Specifically, the insulating adhesive layer 3 is not limited to the pre-formed specifications. Its thickness can be flexibly adjusted according to the specific insulation performance requirements of different areas of the battery cell by precisely controlling the electrostatic spraying parameters (such as spraying time and the amount of spraying material). For areas requiring higher insulation levels, the thickness can be appropriately increased, while for areas with relatively lower insulation requirements, the coating can be thinned. In terms of size, it can be sprayed specifically according to the actual shape and range of the battery cell. Whether it's a regular plane or a complex curved surface, it ensures precise coverage within the preset area, effectively avoiding the problem of insufficient coverage or redundancy that may occur due to the fixed size of the insulating film, thus improving adaptability and material utilization. Conversely, the thickness of the insulating film is fixed during manufacturing and cannot be specifically adjusted according to the insulation needs of different areas of the battery cell. For areas with high insulation requirements, it is difficult to enhance protection by increasing the thickness, while in areas with lower insulation requirements, the fixed thickness leads to unnecessary material consumption.

[0042] 2. When the coating has defects such as appearance, the rework of the battery cell is less difficult. Specifically, when the coating has defects such as appearance, there is no need to disassemble or process the battery cell in a complicated way. The defective coating can be effectively removed by simple methods such as wiping with alcohol or ultrasonic cleaning. The whole process is simple and quick, and will not damage the battery cell itself, thus reducing the difficulty of rework and improving rework efficiency. In contrast, if the insulation film has similar problems, it often needs to be completely peeled off and replaced. This is not only cumbersome, but may also damage the surface of the battery cell during the peeling process, further increasing the cost and difficulty of rework.

[0043] It should be further noted that, in this embodiment, the functional area on the cover plate 2 refers to the area on the cover plate 2 used for setting structures such as the electrode post 201, the explosion-proof valve 203, and the temperature sensing area 202. Furthermore, the battery cell in this embodiment can be, but is not limited to, a square battery cell, a blade battery cell, and a cylindrical battery cell.

[0044] Taking blade battery cells as an example, such as Figure 1 and Figure 2 As shown, the cell housing 1 of a blade battery cell generally has a pair of openings and a pair of cover plates 2. The pair of openings are arranged opposite each other along the X direction; the pair of cover plates 2 respectively cover their corresponding openings.

[0045] According to one embodiment of this utility model, the thickness of the insulating adhesive layer 3 is 100μm to 250μm. This embodiment sets the insulating coating thickness to 100μm to 250μm, which not only forms a sufficiently dense insulating barrier to effectively block the electrical connection between the cell housing 1 and the external structure, but also avoids increasing the overall volume and weight of the cell due to excessive coating thickness. This prevents additional space occupation within the battery pack or increased cell load, ensuring that the energy density of the battery pack is not significantly affected. Simultaneously, the suitable thickness makes it easier for the coating to form a uniform and stable film during adhesion, reducing potential localized insulation weaknesses caused by uneven thickness and further improving the reliability of insulation protection.

[0046] It is understood that the thickness of the insulating adhesive layer 3 can be, but is not limited to, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm, 210μm, 220μm, 230μm, 240μm, 250μm or any value between the two.

[0047] According to one embodiment of the present invention, the thickness of the insulating adhesive layer 3 on the outer peripheral surface of the battery cell housing 1 is 100μm to 150μm; the thickness of the insulating adhesive layer 3 on the outer surface of the cover plate 2 is 100μm to 250μm. This embodiment of the present invention sets the thickness of the insulating adhesive layer 3 on the outer peripheral surface of the battery cell housing 1 to 100μm to 150μm, which provides reliable insulation protection for the battery cell housing 1, effectively blocking the electrical connection between the battery cell and the external structure, and also avoids redundancy in the overall volume of the battery cell due to excessively thick insulating adhesive layer 3, ensuring the adaptability of the battery cell in the assembly space. Controlling the thickness of the insulating adhesive layer 3 on the outer surface of the cover plate 2 to 100μm to 250μm provides targeted insulation protection for the cover plate 2, enhancing the electrical isolation effect between the cover plate 2 and external connectors. At the same time, this thickness range can take into account the structural stability of the adhesive layer, reducing the impact of external friction and collision on the insulation performance of the cover plate 2.

[0048] According to one embodiment of this utility model, the value of gap a along the Y direction and / or Z direction is 1mm ≤ a ≤ 1.5mm. Controlling the gap a along the Y direction and / or Z direction to 1mm ≤ a ≤ 1.5mm ensures that the insulating adhesive layer 3 has sufficient coverage width on the outer surface of the cover plate 2, preventing a decrease in the insulation performance of the cover plate 2 due to insufficient width of the insulating adhesive layer 3; at the same time, it also prevents the insulating adhesive layer 3 from being too wide, which could contaminate the functional areas on the cover plate 2.

[0049] It is understandable that the value of 'a' can be, but is not limited to, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, or any value between any two of these values.

[0050] According to one embodiment of the present invention, the surface dyne value of the insulating adhesive layer 3 is greater than 35 N / m. A surface dyne value greater than 35 N / m improves the wetting and adhesion properties of the insulating adhesive layer 3, allowing it to better bond with the structural adhesive, enhancing the adhesion between the two, and effectively reducing peeling problems caused by insufficient adhesion.

[0051] According to one embodiment of this utility model, under a DC voltage of 500 volts, the insulation resistance of the insulating adhesive layer 3 is greater than 1 GΩ. It can be understood that an insulation resistance greater than 1 GΩ under a DC voltage of 500 volts ensures that the insulating adhesive layer 3 has good insulation performance, thereby effectively blocking current leakage and reducing the risk of short circuits.

[0052] According to one embodiment of this utility model, the flame retardancy of the insulating adhesive layer 3 is UL94V0. It can be understood that a flame retardancy rating of UL94V0 means that the insulating adhesive layer 3 can quickly self-extinguish when exposed to high temperatures or open flames, preventing the spread of fire and improving the safety performance of the battery cell. These features work together to ensure the insulation reliability of the battery cell while also enhancing the structural stability and safety of the battery cell, providing comprehensive protection for the long-term stable operation of the battery cell.

[0053] According to one embodiment of this utility model, the insulating adhesive layer 3 is made of polyurethane acrylate. Specifically, polyurethane acrylate has good adhesion properties, and after coating, it can tightly adhere to the outer peripheral surface of the battery cell housing 1 and the outer surface of the cover plate 2. In addition, this material also has strong chemical corrosion resistance and temperature resistance, can adapt to the complex environment inside the battery cell, resist electrolyte erosion and temperature fluctuations, extend the service life of the insulating adhesive layer 3, and thus improve the overall stability and durability of the battery cell.

[0054] According to an embodiment of the present invention, another aspect provides a battery pack, including: a housing, a plurality of the above-described battery cells, and structural adhesive.

[0055] Specifically, multiple of the aforementioned battery cells are arranged side by side inside the housing; structural adhesive is applied to the bottom surface of each battery cell and to the opposite sides in the direction of the multiple battery cell arrangement, and the structural adhesive is bonded and fixed to the insulating adhesive layer 3 to fix each battery cell to the housing.

[0056] Compared to bonding the insulating film to the structural adhesive, bonding the insulating adhesive layer 3 to the structural adhesive creates a stable connection, ensuring the secure installation of the battery cells within the casing. This effectively resists external forces such as vibration and impact that the battery pack may experience during use, improving overall structural stability. Secondly, the compact and rational layout of multiple battery cells arranged side-by-side makes full use of the casing space. The application of the structural adhesive not only reliably fixes the battery cells to the casing but also avoids adding excessive volume, contributing to the miniaturization design of the battery pack.

[0057] It should be noted that before the aforementioned battery cells are assembled into the battery pack, they must undergo tests for impact resistance, electrolyte resistance, acid and alkali resistance, salt spray resistance, and seawater immersion. Only after these tests are completed and the insulating adhesive layer 3 does not exhibit any signs of paint peeling, cracking, splitting, peeling, or blistering can it be used in the battery pack. This ensures that the insulation and withstand voltage performance of the battery cells meet the design requirements.

[0058] For example, the impact strength test process is as follows: In the impact strength test conducted according to the national standard GB / T1732, after a positive impact with an energy of 5J, the coating is observed through a 4x magnifying glass to see if there are any defects such as paint peeling or cracks.

[0059] According to one embodiment of this utility model, the pull-out strength between the structural adhesive and the insulating adhesive layer 3 is greater than or equal to 10 MPa; and / or, the shear strength between the structural adhesive and the insulating adhesive layer 3 is greater than or equal to 10 MPa. It is understood that higher pull-out strength can effectively resist the tensile force of the battery cell in the direction perpendicular to the surface of the insulating adhesive layer 3, preventing peeling between the battery cell and the structural adhesive; while higher shear strength can resist the shear force of the battery cell in the direction parallel to the surface of the insulating adhesive layer 3, preventing relative displacement of the battery cell under vibration, shaking, or other conditions. This assurance of both strengths makes the fixation of the battery cell within the casing more reliable, maintaining the overall structural stability of the battery pack even under complex working conditions, and reducing potential faults caused by loose connections.

[0060] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, include: The battery cell casing has an opening communicating with its interior at at least one end along the X direction; A cover plate is provided corresponding to and covers the opening, and the outer surface of the cover plate is provided with a functional area; An insulating adhesive layer is applied to the outer peripheral surface of the cell housing and the outer surface of the cover plate, with a gap a between the edge of the insulating adhesive layer on the outer surface of the cover plate and the edge of the functional area.

2. The battery cell according to claim 1, characterized in that, The thickness of the insulating adhesive layer is 100 μm to 250 μm.

3. The battery cell according to claim 2, characterized in that, The thickness of the insulating adhesive layer on the outer peripheral surface of the battery cell housing is 100μm to 150μm; the thickness of the insulating adhesive layer on the outer surface of the cover plate is 100μm to 250μm.

4. The battery cell according to claim 1, characterized in that, Along the Y and / or Z directions, the value of the gap a ranges from 1mm ≤ a ≤ 1.5mm.

5. The battery cell according to claim 1, characterized in that, The surface dyne value of the insulating adhesive layer is greater than 35 N / m.

6. The battery cell according to claim 1, characterized in that, Under a DC voltage of 500 volts, the insulation resistance of the insulating adhesive layer is greater than 1 GΩ.

7. The battery cell according to claim 1, characterized in that, The flame retardancy of the insulating adhesive layer is UL94V0.

8. The battery cell according to claim 1, characterized in that, The insulating adhesive layer is made of polyurethane acrylate.

9. A battery pack, characterized in that, include: Box; The battery cells according to any one of claims 1 to 8 are arranged side by side in the housing; Structural adhesive is applied to the bottom surface of each of the battery cells and to opposite sides in the direction of the arrangement of the battery cells. The structural adhesive is bonded and fixed to the insulating adhesive layer to fix each of the battery cells to the housing.

10. The battery pack according to claim 9, characterized in that, The tensile strength between the structural adhesive and the insulating adhesive layer is greater than or equal to 10 MPa; and / or, the shear strength between the structural adhesive and the insulating adhesive layer is greater than or equal to 10 MPa.

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