Battery and battery pack

Abstract

The utility model discloses a battery and a battery pack, the battery comprises: a housing, at least one end of which is provided with a mounting hole; the cover plate is arranged in the mounting hole, the cover plate surface of the cover plate comprises a first area and a second area, the first area is arranged along the periphery of the second area, the first area is provided with an insulating coating, and the second area is provided with an insulating glue layer; the electrode column is arranged on the cover plate; the insulating plate is adhered to the surface of the cover plate through an insulating adhesive layer; wherein 0.12 F / m < = (d1 / D) * K < = 7F / m; k is the dielectric constant of the insulating glue layer; the shortest distance between the outer edge of the first area and the electrode column is D; the shortest distance between the outer edge of the second area and the electrode column is d1. The stripping risk of the insulating adhesive layer can be reduced, the insulating property of the insulating adhesive layer is ensured, the risk of falling of the insulating plate can be reduced, and the insulating property of the battery is improved.

Description

Technical Field

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

[0002] Batteries, as energy storage devices, are primarily used to power devices that require electrical energy. To ensure battery safety, the battery casing has insulating layers and other insulating structures to guarantee its insulation performance. Especially in battery modules composed of multiple batteries, the insulation structure further enhances the insulation between the batteries.

[0003] The battery casing has a surface for mounting electrode posts. Because the electrode posts protrude from this surface, it is impossible to ensure uniform coating by simply spraying an insulating layer. Therefore, an insulating adhesive with insulating properties is generally used to mount an insulating plate on the surface with electrode posts. The electrode posts can pass through the openings in the insulating plate, and the insulating plate can cover the surface to achieve insulation.

[0004] However, the insulating board is at risk of detachment, and the insulating adhesive is at risk of peeling off, affecting the battery's insulation performance. Especially in high-temperature and high-humidity environments, water seepage can cause the insulating layer on the battery's metal casing to peel off from the casing, leading to battery insulation failure.

[0005] Therefore, how to improve insulation performance has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the present invention provides a battery to improve insulation performance. The present invention also provides a battery pack.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A battery comprising:

[0009] The housing has a mounting hole at at least one end;

[0010] A cover plate is disposed in the mounting hole. The surface of the cover plate includes a first region and a second region. The first region is disposed along the outer periphery of the second region. The first region has an insulating coating, and the second region has an insulating adhesive layer.

[0011] Electrode posts are disposed on the cover plate;

[0012] An insulating board is bonded to the surface of the cover plate by an insulating adhesive layer;

[0013] in,

[0014] 0.12F / m≤(d1 / D)×K≤7F / m;

[0015] K is the dielectric constant of the insulating adhesive layer;

[0016] The shortest distance between the outer edge of the first region and the electrode post is D;

[0017] The shortest distance between the outer edge of the second region and the electrode post is d1.

[0018] This utility model also provides a battery pack, including at least two batteries and a busbar electrically connected to the electrode posts of at least two of the batteries;

[0019] At least one of the batteries is a battery as described above.

[0020] The battery provided by this utility model, through the above-mentioned settings, sets (d1 / D)×K within the above-mentioned range, which can not only prevent the insulating adhesive layer and the insulating plate from peeling off and ensure the insulating performance of the insulating adhesive layer, but also reduce the complexity of the spraying process of the insulating coating, thereby effectively improving the insulation performance of the battery.

[0021] The battery pack provided by this utility model has the above-mentioned battery, and therefore has the same technical effect as the above-mentioned battery, which will not be described in detail here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the battery structure provided in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of a battery with the insulation plate removed, provided in an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of the cover plate surface provided in an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the insulating plate provided in an embodiment of the present utility model. Detailed Implementation

[0027] This utility model discloses a battery to improve insulation performance. This utility model also provides a battery pack.

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figures 1-4 As shown, this embodiment of the present invention provides a battery, including a housing 400, a cover plate, electrode posts 200, and an insulating plate 100. The housing 400 has a mounting hole at at least one end; the cover plate is disposed in the mounting hole; the cover plate surface 100 includes a first region 110 and a second region 120, the first region 110 being disposed along the outer periphery of the second region 120, the first region 110 having an insulating coating, and the second region 120 having an insulating adhesive layer; the electrode posts 200 are disposed on the cover plate; the insulating plate 100 is bonded to the surface of the cover plate 300 by the insulating adhesive layer.

[0030] Wherein, 0.12F / m≤(d1 / D)×K≤7F / m, K is the dielectric constant of the insulating adhesive layer; the shortest distance between the outer edge of the first region 110 and the electrode post 200 is D; the shortest distance between the outer edge of the second region 120 and the electrode post 200 is d1.

[0031] Research has found that:

[0032] If (d1 / D)×K is too large, part of the insulating adhesive layer and the insulating plate 300 bonded to the insulating adhesive layer are easy to peel off from the cover plate. As a result, the cover plate surface 100 is only insulated by the remaining part of the insulating adhesive layer. Moreover, the insulation performance of the insulating adhesive layer is too poor and cannot meet the insulation requirements of the cover plate surface 100. The insulation failure risk of the cover plate surface 100 is relatively large, which can easily cause short circuits in the battery itself and with other batteries, leading to battery safety problems.

[0033] If (d1 / D)×K is too small, the insulation of the cover plate surface 100 will rely too much on the insulating coating, which will require high quality of the insulating coating. Furthermore, if the insulating coating is too close to the electrode post 200, it will be necessary to avoid spraying the insulating coating onto the electrode post 200. This will increase the complexity of the insulating coating spraying process and affect the battery production efficiency.

[0034] The battery provided in this embodiment of the utility model, by setting (d1 / D)×K within the above range, can not only avoid the peeling of the insulating adhesive layer and the insulating plate, ensuring the insulation performance of the insulating adhesive layer, but also reduce the complexity of the spraying process of the insulating coating, thereby effectively improving the insulation performance of the battery.

[0035] It should be noted that the shortest distance D between the outer edge of the first region 110 and the electrode post 200 and the shortest distance d1 between the outer edge of the second region 120 and the electrode post 200 can be dimensions in the same direction on the cover plate surface 100. That is, the direction of the shortest distance between the outer edge of the first region 110 and the electrode post 200 is the same as the direction of the shortest distance between the outer edge of the second region 120 and the electrode post 200.

[0036] In some embodiments, 0.12F / m ≤ (d1 / D)×K ≤ 7F / m, that is, the value range of (d1 / D)×K is 0.12F / m-7F / m. By setting (d1 / D)×K within a reasonable range, peeling between the insulating adhesive layer and the insulating plate 300 can be effectively avoided. That is, when (d1 / D)×K is greater than 7F / m, there is a probability that part of the insulating adhesive layer and the insulating plate 300 bonded to the insulating adhesive layer will peel off from the cover plate; when (d1 / D)×K is less than 0.12F / m, the distance between the insulating coating and the electrode post 200 is too close, which greatly increases the complexity of the insulating coating spraying process and will affect the battery production efficiency.

[0037] That is, (d1 / D)×K can be made to be 0.12F / m. In this embodiment, while avoiding the peeling of the insulating adhesive layer and the insulating plate 300, it is possible to avoid the insulating coating from being too close to the electrode post 200, which would affect the spraying process of the insulating coating and ensure the production efficiency of the battery.

[0038] Alternatively, (d1 / D)×K can be 7F / m. In this embodiment, the distance between the insulating coating and the electrode post 200 is far enough to facilitate the spraying operation of the insulating coating. While ensuring the production efficiency of the battery, it can also meet the connection stability of the insulating adhesive layer and the insulating plate 300 relative to the cover plate, effectively preventing the insulating adhesive layer and the insulating plate 300 from peeling off.

[0039] It is also possible to make (d1 / D)×K 0.14F / m, 0.5F / m, 3F / m, 5F / m or 6.8F / m, etc., which will not be listed here, and all of them can achieve the effect of avoiding peeling of the insulating adhesive layer and the insulating board 300 and ensuring the battery production efficiency.

[0040] Of course, the value range of (d1 / D)×K can also be set to other values. The specific value depends on factors such as the actual structure of the battery and the processing requirements of the battery. There are no specific restrictions here, and all of them are within the protection range.

[0041] In the assembly process of the battery provided by this utility model embodiment, the cover plate can be provided with electrode post holes, and the electrode post 200 is at least partially disposed in the electrode post holes, so that the electrode post 200 has a portion located outside the cover plate (the side of the cover plate facing away from the housing 400) and a portion located inside the cover plate (the side of the cover plate facing the housing 400). Of course, the electrode post 200 can also be disposed without being disposed in the electrode post holes, etc.

[0042] The value of K ranges from 1F / m to 8F / m, meaning that the maximum dielectric constant of the insulating adhesive layer is 8F / m and the minimum is 1F / m. The dielectric constant of the insulating adhesive layer can also be other values, such as 3F / m, 5F / m, or 7F / m.

[0043] The dielectric constant range varies depending on the material of the insulating adhesive layer.

[0044] For example, the insulating layer is made of acrylic adhesive, and the value of K ranges from 3.0 F / m to 3.4 F / m. In embodiments with different insulating layer thicknesses, the dielectric constant of the insulating layer also varies and falls between 3.0 F / m and 3.4 F / m. Specifically, the insulating layer made of acrylic adhesive can have a dielectric constant of 3.0 F / m, 3.1 F / m, 3.2 F / m, 3.3 F / m, or 3.4 F / m, etc.

[0045] Alternatively, the insulating layer can be made of PET (Polyethylene terephthalate) double-sided tape, with K ranging from 3.0F / m to 3.5F / m. Specifically, the insulating layer made of PET double-sided tape can have a strength of 3.0F / m, 3.1F / m, 3.2F / m, 3.3F / m, 3.4F / m, or 3.5F / m, etc.

[0046] Alternatively, the insulating adhesive layer can be made of acrylic double-sided tape, with K ranging from 2.5F / m to 3.5F / m. Specifically, the insulating adhesive layer made of acrylic double-sided tape can have a strength of 2.5F / m, 2.8F / m, 3.0F / m, 3.3F / m, or 3.5F / m, etc.

[0047] In some embodiments, the first region 110 and the second region 120 partially overlap, that is, the insulating coating of the first region 110 can partially overlap with the insulating adhesive layer of the second region 120. This arrangement effectively avoids areas of insulation failure caused by a gap between the first region 110 and the second region 120. By partially overlapping the insulating adhesive layer and the insulating coating, even if the insulating adhesive layer and the insulating plate 300 peel off from the cover plate surface 100, the insulating coating can still provide insulation for the overlapping portion. Alternatively, the first region 110 and the second region 120 can not overlap, that is, the first region 110 and the second region 120 are relatively independent. In this case, the first region 110 and the second region 120 can be in contact, that is, the edge of the first region 110 contacts the edge of the second region 120, so that there is no gap between the first region 110 and the second region 120. The first region 110 and the second region 120 can also be spaced apart, and other insulating layers (such as insulating films) can be provided in the space between the first region 110 and the second region 120.

[0048] For ease of processing and improved insulation performance, in embodiments where the first region 110 and the second region 120 partially overlap, the first region 110 and the second region 120 have an overlapping portion. The width of this overlapping portion can be further ranged from 1 to 10 mm. The direction of the overlapping portion width is the extension direction of the shortest distance between the outer edge of the first region 110 and the electrode post 200. This design avoids waste due to an excessively large overlapping portion and also avoids processing difficulties due to an excessively small overlapping portion width. The overlapping area formed by the first region 110 and the second region 120 covers both the insulating coating and the insulating adhesive layer. To ensure the utilization rate of the insulating adhesive layer, the insulating coating can be processed first in the overlapping area by spraying or other methods, and then the insulating adhesive layer can be applied to the insulating coating. This ensures the adhesion of the insulating adhesive layer in the overlapping area, thereby enabling the insulating adhesive layer in the overlapping area to adhere to the insulating board 300. Of course, for other reasons, the insulating adhesive layer can be placed in the overlap area of ​​the planned first area 110 and second area 120 first, and then an insulating coating can be processed on the insulating adhesive layer in the overlap area by spraying or other methods. There are no specific restrictions here and all are within the protection range.

[0049] Because the insulating coating has a higher roughness relative to the cover surface 100, the insulating adhesive layer covering the insulating coating is more prone to peeling off in the overlapping portion where the first region 110 and the second region 120 partially overlap. Therefore, it is possible to further ensure that 0.12F / m ≤ (d1 / D)×K ≤ 6.8F / m, that is, the value range of (d1 / D)×K is 0.12F / m-6.8F / m, which can effectively avoid the risk of peeling between the insulating adhesive layer and the insulating plate 300 relative to the cover surface 100. That is, in this embodiment, (d1 / D)×K is 0.12F / m, 0.4F / m, 2F / m, 3.5F / m, 5F / m, or 6.8F / m, etc., which will not be listed here, and all of them can satisfy the effect of avoiding peeling between the insulating adhesive layer and the insulating plate 300 and ensuring battery production efficiency.

[0050] In this embodiment, the thickness of the insulating adhesive layer is greater than the thickness of the insulating coating. It is understood that a thicker layer results in a greater creepage distance and better insulation. Preferably, the thickness of the insulating adhesive layer is greater than the thickness of the insulating coating, ensuring both the insulation effect of the adhesive layer and facilitating the spraying process of the insulating coating. By setting the thickness of the insulating adhesive layer greater than the insulating coating, a larger insulating adhesive layer ensures that even if partial peeling occurs, a portion of the insulating adhesive layer remaining on the cover surface 100 is still retained. That is, even if partial peeling occurs along the thickness direction of the insulating adhesive layer, a portion of the insulating adhesive layer remains on the cover surface 100 along the thickness direction, and this other portion is thinner than the original insulating adhesive layer. This other portion of the insulating adhesive layer meets the creepage distance requirements, thus ensuring the insulation effect of the cover surface 100.

[0051] In some specific embodiments, the thickness of the insulating adhesive layer ranges from 0.05 to 0.9 mm. That is, the thickness of the insulating adhesive layer can be 0.05 mm, 0.1 mm, 0.5 mm, or 0.9 mm, etc., without any specific limitation and depending on the actual design requirements of the battery.

[0052] Furthermore, in some specific embodiments, the thickness of the insulating coating ranges from 0.03 to 0.8 mm. That is, the thickness of the insulating coating can be 0.03 mm, 0.1 mm, 0.4 mm, or 0.8 mm, etc., without any specific limitation and depending on the actual design requirements of the battery.

[0053] In an embodiment where the shortest distance D between the outer edge of the first region 110 and the electrode post 200 and the shortest distance d1 between the outer edge of the second region 120 and the electrode post 200 are in the same direction on the cover surface 100, the width of the first region 110 is (D-d1). Further, the width (D-d1) of the first region 110 can range from 1mm to 18mm. Specifically, d1 can range from 1mm to 53mm, D can range from 2mm to 55mm, and d1 / D can range from 0.1 to 0.9. That is, (D-d1) can be 1mm, 2mm, 5mm, 10mm, or 18mm, d1 can be 1mm, 10mm, 25mm, or 53mm, D can be 2mm, 10mm, 25mm, or 55mm, and d1 / D can be 0.1, 0.2, 0.5, or 0.9.

[0054] (D-d1), d1, D, and d1 / D can also be set to other values. The specific values ​​depend on the actual structure of the battery and the processing requirements of the battery. No specific restrictions are imposed here, and all are within the protection range.

[0055] For ease of processing, such as Figure 3 As shown, the first region 110 has a frame structure, wherein the width of any side of the frame structure is D-d1. This design facilitates the spraying of the insulating coating on the first region 110 and ensures the symmetry of the first region 110 and the second region 120 on the cover plate surface 100, thereby further improving the insulation performance.

[0056] In the battery provided in this embodiment of the utility model, the cover surface 100 is the small side surface of the battery, which is the side with the smallest area among the multiple outer surfaces of the battery. Taking the battery as a cuboid as an example, the battery has six outer surfaces, of which the housing 400 has five of the six outer surfaces of the battery, and the mounting hole occupies the remaining one of the six outer surfaces of the battery. Through the connection between the cover and the housing 400, the cover surface 100 is the remaining one of the six outer surfaces.

[0057] In embodiments where the battery length is greater than the battery height and the battery height is greater than the battery width, the small side is the surface of the battery casing enclosed by the height edge and the width edge. Since the cover surface 100 is the small side of the battery, the risk of insulation failure is effectively reduced, further improving insulation performance. In the operation of multiple integrated battery modules (battery packs), this facilitates the integration of multiple batteries, and effectively improves integration efficiency when arranging multiple batteries to form a battery module.

[0058] In a battery module (battery pack) formed by combining multiple batteries, the surface enclosed by the length edge and the height edge of the battery casing is the opposite surface, and the opposite surfaces of two adjacent batteries are set opposite each other.

[0059] To reduce or avoid the risk of water peeling and wetting of the insulating adhesive layer and insulating board 300, the small side is perpendicular to the horizontal plane when the battery is normally placed. The angle between the small side and the horizontal plane can range from 85° to 95°, meaning a processing error of ±5° is permissible. Of course, other values ​​can be set for the permissible processing error, such as 3°, 7°, or 10°. When rainwater or condensation is on the small side, the liquid will flow over it under its own gravity, avoiding prolonged contact and thus reducing the risk of peeling and wetting.

[0060] Of course, the smaller side can also be tilted at a certain angle to the horizontal plane. There are no specific restrictions here, and all of them are within the protection range.

[0061] The distance D between the outer edge of the first region 110 and the electrode post 200, and the distance d1 between the outer edge of the second region 120 and the electrode post 200, are dimensions relative to the cover surface 100 in the same direction. For example... Figure 3 As shown, in this embodiment, the distance D between the outer edge of the first region 110 and the electrode post 200 is a dimension along the horizontal direction; the distance d1 between the outer edge of the second region 120 and the electrode post 200 is also a dimension along the horizontal direction.

[0062] To further improve insulation, at least a portion of the surface of the housing 400 has an insulating coating. This insulating coating may include the top surface of the battery. Taking a cuboid battery as an example, the battery has six outer surfaces, and the top surface is the surface enclosed by the battery's length edge and width edge.

[0063] Alternatively, an insulating coating can be applied to all surfaces of the battery casing except for the cover plate surface 100 to ensure the insulation performance of the other surfaces of the battery.

[0064] For ease of processing and to further improve insulation performance, the battery includes at least two electrode posts 200, including a positive electrode post and a negative electrode post, which are located on the same side of the battery. That is, the electrode posts 200 only need to be provided on one side of the battery (the cover surface 100), and the other sides (the surface of the casing 400) can all be coated with an insulating coating by means of spraying or other processing methods to achieve the insulation effect.

[0065] like Figure 3As shown, in this embodiment, the cover plate surface 100 has two electrode posts 200, namely a positive electrode post and a negative electrode post. The two electrode posts 200 are arranged along the height direction, effectively reducing the risk of both electrode posts 200 being simultaneously wetted by water, and further improving the insulation effect.

[0066] Since both the positive and negative electrode posts are located on the cover plate surface 100, heat is prone to accumulate at the cover plate. The insulating adhesive layer is easily melted by the heat, increasing the risk of peeling between the insulating adhesive layer and the insulating plate 300. Therefore, 0.12F / m ≤ (d1 / D)×K ≤ 6.8F / m. That is, the value of (d1 / D)×K ranges from 0.12F / m to 6.8F / m, which can improve the connection strength between the insulating adhesive layer and the insulating plate 300, thereby avoiding the risk of peeling between the insulating adhesive layer and the insulating plate 300 and the cover plate surface 100.

[0067] To improve the adhesion of the insulating board 300, the edges of the projection area of ​​the insulating board 300 onto the cover surface 100 coincide with the edges of the projection area of ​​the insulating adhesive layer onto the cover surface 100. That is, the edges of the insulating board 300 and the insulating adhesive layer are aligned, thus avoiding gaps between the edges of the insulating board 300 and the cover surface 100, and preventing the insulating adhesive layer from overflowing the insulating board 300. This ensures the adhesion of the insulating board 300 while avoiding material waste of the insulating adhesive layer.

[0068] Furthermore, the battery also includes a battery cell, which is located within the housing 400 and electrically connected to the electrode post 200. Specifically, the housing 400 and the cover plate form a relatively closed cavity, in which the battery cell is located and electrically connected to the portion of the electrode post 200 that passes through the electrode post hole on the cover plate and extends into the cavity.

[0069] In some embodiments, when the insulating plate 300 is peeled off from the cover plate surface 100, the insulating adhesive layer consists of a first adhesive layer and a second adhesive layer. The first adhesive layer is connected to the cover plate surface 100, and the second adhesive layer is connected to the insulating plate 300. The peeling of the insulating plate 300 from the cover plate surface 100 can be caused by factors such as aging of the insulating adhesive layer or deformation of the insulating plate 300 due to aging, or it can be caused by external force applied to the insulating plate 300. Since the first adhesive layer is connected to the cover plate surface 100 and the second adhesive layer is connected to the insulating plate 300 when the insulating plate 300 is peeled off, the first adhesive layer ensures the insulation effect on the cover plate surface 100.

[0070] Of course, by adjusting the material of the insulating plate 300 and the roughness of the contact surface between the insulating plate 300 and the insulating adhesive layer, the insulating adhesive layer can be connected to the cover plate surface 100 when the insulating plate 300 is peeled off, and the insulating plate 300 can be separated from the insulating adhesive layer. No specific restrictions are made here.

[0071] Preferably, to ensure that the insulating adhesive layer can be divided into a first adhesive layer and a second adhesive layer, the thickness of the insulating adhesive layer is in the range of 0.05-0.9 mm. That is, the thickness of the insulating adhesive layer can be 0.05 mm, 0.1 mm, 0.5 mm, or 0.9 mm, etc.

[0072] This utility model embodiment also provides a battery pack, including at least two batteries and a busbar electrically connected to the electrode posts of at least two batteries; at least one of the batteries is a battery as described above.

[0073] Since the aforementioned battery has the aforementioned technical effects, the battery pack containing the aforementioned battery should also have the same technical effects, which will not be described in detail here.

[0074] In some embodiments, the electrode posts 200 are located on a surface of the battery pack that is perpendicular to the horizontal plane when the battery pack is in its normal placement state. That is, the surface of the battery pack that is perpendicular to the horizontal plane when the battery pack is in its normal placement state may include the small side surfaces of multiple batteries. In other words, when multiple batteries are arranged, the small side surfaces of the batteries have electrode posts 200 and are located on the same surface and arranged to form a surface of the battery pack, which is perpendicular to the horizontal plane.

[0075] Since the surface of electrode post 200 is perpendicular to the horizontal plane (ground), the probability of water immersion on the surface of electrode post 200 can be effectively avoided, further reducing the risk of peeling off the insulating adhesive layer and insulating plate 300. Therefore, it is possible to ensure that 0.14F / m ≤ (d1 / D)×K ≤ 7F / m. That is, the value range of (d1 / D)×K is 0.14F / m-7F / m, which ensures the spraying efficiency of the insulating coating while avoiding the risk of peeling.

[0076] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0077] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery, characterized by, The application relates to a battery cover plate and a battery. The battery cover plate comprises a shell (400) provided with a mounting hole at least at one end; a cover plate provided in the mounting hole, wherein a cover plate surface (100) of the cover plate comprises a first area (110) and a second area (120), the first area (110) is arranged along the outer periphery of the second area (120), the first area (110) is provided with an insulating coating, and the second area (120) is provided with an insulating adhesive layer; an electrode column (200) arranged on the cover plate; and an insulating plate (300) adhered to the cover plate surface (100) by the insulating adhesive layer. 0.12F / m <= (d1 / D) * K <= 7F / m. K is the dielectric constant of the insulating adhesive layer. The shortest distance between the outer edge of the first area (110) and the electrode column (200) is D. The shortest distance between the outer edge of the second area (120) and the electrode column (200) is d1. The value range of K is 1F / m-8F / m. The insulating adhesive layer is acrylic adhesive, the value range of K is 3.0F / m-3.4F / m. Or, the insulating adhesive layer is PET double-sided adhesive, the value range of K is 3.0F / m-3.5F / m. Or, the insulating adhesive layer is acrylic ester double-sided adhesive, the value range of K is 2.5F / m-3.5F / m.

2. The battery of claim 1, wherein, The first area (110) and the second area (120) do not overlap.

3. The battery of claim 2, wherein, The first area (110) and the second area (120) partially overlap, the value range of the width of the overlapping part of the first area (110) and the second area (120) is 1-10mm. The direction of the width of the overlapping part is the extension direction of the shortest distance between the outer edge of the first area (110) and the electrode column (200). 0.12F / m <= (d1 / D) * K <= 6.8F / m.

4. The battery of claim 1, wherein, The thickness of the insulating adhesive layer is greater than the thickness of the insulating coating.

5. The battery of claim 1, wherein, And / or, the value range of the thickness of the insulating adhesive layer is 0.05-0.9mm. And / or, the value range of the thickness of the insulating coating is 0.03-0.8mm.

6. The battery of claim 5, wherein, The value range of the width (D-d1) of the first area (110) is 1mm-18mm.

7. The battery of claim 1, wherein, And / or, the value range of d1 is 1mm-53mm. And / or, the value range of D is 2mm-55mm. And / or, the value range of d1 / D is 0.1-0.

9.

8. The battery of claim 1, wherein, The cover plate surface (100) is a small side of the battery, and the small side is the smallest one among the multiple outer surfaces of the battery. At least part of the surface of the shell is provided with the insulating coating. The battery comprises at least two electrode columns (200), at least two of which comprise a positive electrode column and a negative electrode column, and the positive electrode column and the negative electrode column are located on the same side of the battery. 0.12F / m <= (d1 / D) * K <= 6.8F / m.

9. The battery of claim 1, wherein, The projection area of the insulating plate (300) on the cover plate surface (100) is coincident with the edge of the projection area of the insulating adhesive layer on the cover plate surface (100).

10. The battery of claim 1, wherein, ​ 11. The battery of claim 1, wherein, ​ 12. The battery of claim 11, wherein, ​ 13. The battery of claim 1, wherein, ​ 14. The battery of claim 1, wherein, The battery further comprises an electric core which is located in the shell (400) and electrically connected with the electrode post (200).

15. The battery of any one of claims 1-14, wherein, In the state that the insulating plate (300) is peeled off from the surface (100) of the cover plate, the insulating adhesive layer is divided into a first adhesive layer and a second adhesive layer, the first adhesive layer is connected with the surface (100) of the cover plate, and the second adhesive layer is connected with the insulating plate (300).

16. A battery pack, characterized by The battery further comprises a bus bar which comprises at least two batteries and an electrode post electrically connecting the at least two batteries. At least one of the batteries is the battery as claimed in any one of claims 1-15.

17. The battery pack of claim 16, wherein, The electrode post (200) is perpendicular to the surface of the horizontal plane in the normal placement state of the battery pack.

18. The battery pack of claim 17, wherein, 0.14F / m≤(d1 / D)×K≤7F / m.

Images