Battery and battery pack

Abstract

Battery, comprehensive a housing (400) provided with a mounting hole at at least one end; a cover plate disposed in the mounting hole, wherein a cover plate surface (100) of the cover plate comprises a first portion (110) and a second portion (120), the first portion (110) is disposed along the perimeter of the second portion (120), the first portion (110) has an insulating coating, and the second portion (120) has an insulating adhesive layer; a terminal post (200) disposed on the cover plate; an insulating plate (300) connected to the cover plate surface (100) via an insulating adhesive layer; where 0.12 F / m ≤ (d1 / D) × K ≤ 7 F / m K is the dielectric constant of the insulating adhesive layer; the shortest distance between the outer edge of the first section (110) and the terminal post (200) is D; the shortest distance between the outer edge of the second section (120) and the terminal post (200) is d1.

Description

TECHNICAL FIELD

[0001] The present utility model relates to the technical field of battery equipment, in particular to a battery and a battery pack. BACKGROUND OF THE INVENTION

[0002] As energy storage devices, batteries are primarily used to power devices that require electrical energy. To ensure safety during battery use, the surface of the battery case is provided with an insulating structure, such as an insulating layer, to ensure the battery's insulating performance. Especially in a battery array consisting of multiple batteries, the insulating performance between batteries can be improved by applying an insulating structure.

[0003] The battery casing has a surface on which terminal posts are mounted. Because the terminal posts protrude from the surface, spraying the insulating layer cannot ensure uniformity. Therefore, an insulating adhesive with insulating properties is usually used to apply an insulating plate to the surface with the terminal posts. The terminal posts can be inserted through openings in the insulating plate, and the insulating plate can cover the surface to achieve the required insulation performance.

[0004] However, there is a risk that the insulation plate will fall off and the insulation adhesive will peel off, compromising the battery's insulation performance. Especially in high-temperature and high-humidity environments, there is a risk that water will penetrate beneath the insulation layer on the surface of the battery's metal casing, causing it to peel off, and resulting in the battery's insulation failure.

[0005] Therefore, the question of how to improve insulation performance has become a problem that must be solved by a specialist. SUMMARY OF THE UTILITY MODEL

[0006] In view of the above, the present utility model provides a battery for improving insulation performance. The present utility model also provides a battery pack.

[0007] To solve the above problem, the present utility model uses the following technical solutions: A battery with: a housing having a mounting hole at at least one end; a cover plate disposed in the mounting hole, the cover plate surface of the cover plate comprising a first portion and a second portion, the first portion being disposed along the periphery of the second portion, the first portion having an insulating coating, and the second portion having an insulating adhesive layer; a terminal post arranged on the cover plate; an insulating plate which is connected to the cover plate surface via the insulating adhesive layer; wherein 0.12 F / m≤(d1 / D)×K≤7 F / m; K is the dielectric constant of the insulating adhesive layer; the shortest distance between the outer edge of the first section and the terminal post is D; the shortest distance between the outer edge of the second section and the terminal post is d1.

[0008] The present utility model further provides a battery pack comprising at least two batteries and a bus bar electrically connecting terminal posts of the at least two batteries; at least one of the batteries is a battery as described above.

[0009] With the above arrangement, the battery according to the present utility model sets (d1 / D)×K within the above range, which can not only avoid the peeling of the insulating adhesive layer and the insulating plate to 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 insulating performance of the battery.

[0010] The battery pack of the present utility model has the above-mentioned battery and therefore has the same technical effects as the above-mentioned battery, which is not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] To better illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings required to describe the specific embodiments or the prior art are briefly presented below. It is understood that the drawings described below represent some embodiments of the present application. A person skilled in the art can derive other drawings based on these drawings without any creative effort. Fig. 1 is a schematic diagram of the structure of the battery according to an embodiment of the present utility model; Fig. 2 is a schematic diagram of the structure of the battery with the insulation plate removed according to an embodiment of the present utility model; Fig. 3 is a schematic diagram of the structure of the cover plate surface according to an embodiment of the present utility model. Fig. 4 is a schematic diagram of the structure of the insulating plate according to an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] The present utility model discloses a battery for improving insulation performance. The present utility model also provides a battery pack.

[0013] The technical scheme in the embodiment of the present utility model will be described clearly and completely below in conjunction with the drawings in the embodiment of the present utility model. It is obvious that the described embodiment is only a part of the embodiment of the present utility model, not the entire embodiment. Based on the embodiment of the present utility model, all other embodiments obtained by a person skilled in the art without creative effort fall within the scope of the present utility model.

[0014] As in the Fig. As shown in Figures 1 to 4, one embodiment of the present invention provides a battery comprising a case 400, a cover plate, a terminal post 200, and an insulating plate 300. The case 400 is provided with a mounting hole at at least one end; the cover plate is disposed in the mounting hole. The cover plate surface 100 of the cover plate includes a first portion 110 and a second portion 120. The first portion 110 is disposed along the periphery of the second portion 120. The first portion 110 has an insulating coating, and the second portion 120 has an insulating adhesive layer. The terminal post 200 is disposed on the cover plate. The insulating plate 300 is bonded to the cover plate surface 100 via the insulating adhesive layer.

[0015] In the present embodiment, 0.12 F / m≤(dl / D)×K≤7 F / m, where K is the dielectric constant of the insulating adhesive layer; the shortest distance between the outer edge of the first portion 110 and the terminal post 200 is D; and the shortest distance between the outer edge of the second portion 120 and the terminal post 200 is d1. Investigations have shown the following:

[0016] 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 easily peeled off relative to the cover plate, resulting in the cover plate surface 100 being insulated only by the remaining part of the insulating adhesive layer, and the insulating performance of the insulating adhesive layer being too poor to meet the insulation requirements of the cover plate surface 100. The risk of insulation failure on the cover plate surface 100 is relatively high, which can easily lead to short circuits between the battery itself and other batteries, which in turn causes battery safety issues.

[0017] If (d1 / D)×K is too small, the insulation of the cover plate surface 100 relies too heavily on the insulating coating, which requires a high spray quality for the insulating layer. Furthermore, the distance between the insulating coating and the terminal post 200 is too small. When spraying the insulating layer, it is necessary to avoid spraying the insulating coating onto the terminal post 200. The spraying process of the insulating coating increases the complexity, which affects the production efficiency of the battery.

[0018] With the above arrangement, the battery according to the embodiment of the present utility model sets (d1 / D)×K within the above range, so that the peeling of the insulating adhesive layer and the insulating plate can be avoided, which not only can prevent the peeling of the insulating adhesive layer and the insulating plate to ensure the insulating performance of the insulating adhesive layer, but also reduces the complexity of the spraying process of the insulating coating, thereby effectively improving the insulating performance of the battery.

[0019] Note that the shortest distance D between the outer edge of the first section 110 and the terminal post 200 and the shortest distance d1 between the outer edge of the second section 120 and the terminal post 200 may be the dimensions in the same direction (the same one direction) on the cover plate surface 100. That is, the direction of the shortest distance between the outer edge of the first section 110 and the terminal post 200 is the same as the direction of the shortest distance between the outer edge of the second section 120 and the terminal post 200.

[0020] In some embodiments, 0.12 F / m≤(d1 / D)×K≤7 F / m, that is, the value range of (d1 / D)×K is 0.12 F / m-7 F / m. By setting (d1 / D)×K within a reasonable range, peeling of the insulating adhesive layer and the insulating plate 300 can be effectively prevented. That is, if (d1 / D)×K is greater than 7 F / m, there is a possibility that part of the insulating adhesive layer and the insulating plate 300 bonded to the insulating adhesive layer will peel off relative to the cover plate; if (d1 / D)×K is less than 0.12 F / m, the distance between the insulating coating and the terminal post 200 is too small, which complicates the spraying process of the insulating coating and affects the production efficiency of the battery.

[0021] That is, (d1 / D)×K can be set to 0.12 F / m. In the present embodiment, based on preventing the peeling of the insulating adhesive layer and the insulating plate 300, the distance between the insulating coating and the terminal post 200 can be largely prevented from affecting the spraying process of the insulating coating, thereby ensuring the production efficiency of the battery.

[0022] (d1 / D)×K can also be set to 7 F / m. In the present embodiment, the distance between the insulating coating and the terminal post 200 is large enough to facilitate the spraying process of the insulating coating. Furthermore, based on ensuring the production efficiency of the battery, the connection stability of the insulating adhesive layer and the insulating plate 300 with respect to the cover plate can be satisfied, and the peeling of the insulating adhesive layer and the insulating plate 300 can be effectively prevented.

[0023] (d1 / D)×K can also be set to 0.14 F / m, 0.5 F / m, 3 F / m, 5 F / m or 6.8 F / m, etc., which will not be described in detail here, and all of the above values ​​can achieve the effect of preventing the peeling of the insulating adhesive layer and the insulating plate 300 and ensuring the production efficiency of the battery.

[0024] Of course, the range of (d1 / D)×K can also be set to other values. The specific values ​​depend on the actual battery structure and processing requirements. There are no specific restrictions, and they all fall within the scope of protection.

[0025] During the assembly process of the battery according to the present embodiment of the present utility model, a terminal post hole may be arranged on the cover plate, and the terminal post 200 may be at least partially arranged in the terminal post hole, such that the terminal 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 terminal post 200 may not be arranged in the terminal post hole, etc.

[0026] In the present embodiment, the value range of K is 1 F / m-8 F / m, i.e., the maximum value of the dielectric constant of the insulating adhesive layer is 8 F / m and the minimum value is 1 F / m. The dielectric constant of the insulating adhesive layer can also take other values, e.g., 3 F / m, 5 F / m, or 7 F / m, etc.

[0027] If the material of the insulating adhesive layer is different, the range of values ​​of the dielectric constant is also different.

[0028] For example, if the insulating adhesive layer is an acrylic adhesive, the K value range is 3.0 F / m - 3.4 F / m. In embodiments with different thicknesses of the insulating adhesive layer, the dielectric constant of the insulating adhesive layer also varies and ranges between 3.0 F / m and 3.4 F / m. Specifically, the insulating adhesive layer made of acrylic adhesive can be 3.0 F / m, 3.1 F / m, 3.2 F / m, 3.3 F / m, or 3.4 F / m, etc.

[0029] Alternatively, the insulating adhesive layer can also be a double-sided adhesive made of PET (polyethylene terephthalate), and the K value range is 3.0 F / m-3.5 F / m. Specifically, the insulating adhesive layer made of double-sided PET adhesive can be 3.0 F / m, 3.1 F / m, 3.2 F / m, 3.3 F / m, 3.4 F / m, or 3.5 F / m, etc.

[0030] The insulating adhesive layer can also be a double-sided acrylic adhesive, and the value range of K is 2.5 F / m-3.5 F / m. Specifically, the insulating adhesive layer made of double-sided acrylic adhesive can be 2.5 F / m, 2.8 F / m, 3.0 F / m, 3.3 F / m, or 3.5 F / m, etc.

[0031] In some embodiments, the first portion 110 and the second portion 120 partially overlap, that is, the insulating coating of the first portion 110 may partially overlap with the insulating adhesive layer of the second portion 120. With the above arrangement, a portion where an insulation failure occurs due to the interval arrangement between the first portion 110 and the second portion 120 is effectively avoided. The insulating adhesive layer and the insulating coating partially overlap. Even if the insulating adhesive layer and the insulating plate 300 peel off from the cover plate surface 100 in the overlap region, the insulating effect of that portion can be achieved by the insulating coating. It is also possible for the first portion 110 and the second portion 120 not to overlap, that is, the first portion 110 and the second portion 120 are relatively independent.In the present embodiment, the first portion 110 and the second portion 120 may be in contact with each other, that is, the edge of the first portion 110 is in contact with the edge of the second portion 120, so that there is no spaced portion between the first portion 110 and the second portion 120. It is also possible that the first portion 110 and the second portion 120 are arranged at intervals, and that other insulating layers (such as insulating films, etc.) may be arranged in the spaced portion between the first portion 110 and the second portion 120.

[0032] To facilitate processing and improve insulation performance, in the embodiment in which the first portion 110 and the second portion 120 partially overlap, the first portion 110 and the second portion 120 may have an overlap portion, and the width of the overlap portion between the first portion 110 and the second portion 120 may further be set within a value range of 1-10 mm. In the present embodiment, the direction of the width of the overlap portion is the extending direction of the shortest distance between the outer edge of the first portion 110 and the terminal post 200. With the above arrangement, the overlap portion is prevented from being too large to cause scrap, and it is also prevented from being too small and inconvenient to process.In the present embodiment, the overlap portion formed by the overlap of the first portion 110 and the second portion 120 is covered with both the insulating coating and the insulating adhesive layer. To ensure the utilization of the insulating adhesive layer, the insulating layer in the overlap portion may first be processed by spraying or other methods, and then the insulating adhesive layer may be arranged on the insulating coating to ensure the bonding effect of the insulating adhesive layer in the overlap region, so that the insulating adhesive layer in the overlap portion functions to bond the insulating plate 300.Of course, for other considerations, the insulating adhesive layer may first be arranged in the overlapping portion of the planned overlap of the first portion 110 and the second portion 120, and then the insulating coating may be applied to the insulating adhesive layer in the overlapping portion by spraying or other methods. There are no specific restrictions on this, and both are within the scope of protection.

[0033] Since the insulating coating has a greater roughness than the cover plate surface 100, the insulating adhesive layer covering the insulating coating is more likely to peel off in the overlap portion where the first portion 110 and the second portion 120 partially overlap. Therefore, 0.12 F / m≤(d1 / D)×K≤6.8 F / m can be further set, that is, the value range of (d1 / D)×K is 0.12 F / m-6.8 F / m, which can effectively prevent the risk of peeling off the insulating adhesive layer and the insulating plate 300 relative to the cover plate surface 100. That is, in the present embodiment, (d1 / D)×K is 0.12 F / m, 0.4 F / m, 2 F / m, 3.5 F / m, 5 F / m, or 6.8 F / m, etc., which will not be described in detail here, and all of the above values ​​can satisfy the effect of preventing the peeling of the insulating adhesive layer and the insulating plate 300 and ensuring the efficiency of battery manufacturing.

[0034] In the present embodiment, the thickness of the insulating adhesive layer is greater than the thickness of the insulating coating. The thicker the thickness, the greater the creepage distance and the better the insulation effect. Preferably, the thickness of the insulating adhesive layer is greater than the thickness of the insulating coating, which not only ensures the insulating effect of the insulating adhesive layer but also facilitates the spray processing of the insulating coating. With the above arrangement, the thickness of the insulating adhesive layer is greater than the thickness of the insulating coating, so that the thickness of the insulating adhesive layer is greater, and even if the insulating adhesive layer partially peels off, the thickness of the part of the insulating adhesive layer remaining on the cover plate surface 100 can be guaranteed.That is, the insulating adhesive layer partially peels off along its thickness direction. When a portion of the insulating adhesive layer peels off along the thickness direction of the insulating adhesive layer, another portion of the insulating adhesive layer remains on the cover plate surface 100 along the thickness direction of the insulating adhesive layer. The thickness of the other portion of the insulating adhesive layer is less than the thickness of the insulating adhesive layer. The other portion of the insulating adhesive layer can meet the creepage distance requirements, thereby ensuring the insulating effect of the cover plate surface 100.

[0035] In some embodiments, the thickness of the insulating adhesive layer is between 0.05 and 0.9 mm. That is, the thickness of the insulating adhesive layer may be 0.05 mm, 0.1 mm, 0.5 mm, or 0.9 mm, etc., which is not specifically limited and depends on the actual design requirements of the battery.

[0036] In some specific embodiments, the thickness of the insulating layer ranges from 0.03 to 0.8 mm. That is, the thickness of the insulating layer can be 0.03 mm, 0.1 mm, 0.4 mm, or 0.8 mm, etc., and there is no specific limitation; it depends on the actual design requirements of the battery.

[0037] In an embodiment where the shortest distance D between the outer edge of the first section 110 and the terminal post 200 and the shortest distance d1 between the outer edge of the second section 120 and the terminal post 200 represent dimensions in the same direction on the cover plate surface 100, the width of the first section 110 is (D-d1). Furthermore, the width (D-d1) of the first section 110 is between 1 mm and 18 mm. In the present embodiment, the value range of d1 can be 1 mm-53 mm, the value range of D can be 2 mm-55 mm, and the value range of d1 / D can be 0.1-0.9. That is, (D-d1) can be 1 mm, 2 mm, 5 mm, 10 mm or 18 mm, d1 can be 1 mm, 10 mm, 25 mm or 53 mm, and D can be 2 mm, 10 mm, 25 mm or 55 mm, d1 / D can be 0.1, 0.2, 0.5 or 0.9.

[0038] (D-d1), d1, D, and d1 / D can also be set to other values. The specific values ​​depend on the actual battery structure and processing requirements. There are no specific restrictions, and they all fall within the scope of protection.

[0039] To simplify processing, the first section 110, as in Fig. 3, a frame structure, wherein the width of any side of the frame structure is D-d1. With the above arrangement, it is convenient to spray the insulating coating onto the first portion 110, and the symmetry of the first portion 110 and the second portion 120 on the cover plate surface 100 can also be ensured, thereby further improving the insulating performance.

[0040] In the battery according to the embodiment of the present utility model, the cover plate surface 100 is the small side surface of the battery, and the small side surface is the side surface with the smallest area among the multiple outer surfaces of the battery. For example, in a rectangular prismatic battery, the battery has six outer surfaces, the case 400 occupies 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. Due to the connection between the cover plate and the case 400, the cover plate surface 100 is the remaining one of the six outer surfaces.

[0041] In an embodiment where the length of the battery is greater than the height of the battery and the height of the battery is greater than the width of the battery, the small side surface is the area of ​​the battery case surrounded by the height edge and the width edge. Since the cover plate surface 100 is the small side surface of the battery, the risk of insulation failure is effectively reduced and the insulation performance is further improved. When integrating multiple batteries into a battery module (battery pack), the integration of multiple batteries is facilitated, and when multiple batteries are arranged to form a battery module, the integration efficiency can be effectively improved.

[0042] In a battery module (battery pack) formed by a combination of several batteries, the surfaces enclosed by the longitudinal edge and the vertical edge of the battery case are opposite surfaces, and the opposite surfaces of two adjacent batteries are arranged opposite each other.

[0043] In order to reduce or avoid the risk of peeling and water penetration into the insulating adhesive layer and the insulating plate 300, the small side surface is relatively perpendicular to the horizontal plane when the battery is normally arranged, and the angle between the small side surface and the horizontal plane can be within the range of 85°-95°, that is, the allowable processing error is ±5°. Of course, the allowable processing error can also be set to other values, such as 3°, 7°, or 10°. When liquids such as rain or condensation water are present on the small side surface, the liquid will flow through the small side surface due to its own gravity to avoid long-term contact with the small side surface, thereby reducing the risk of peeling and penetration.

[0044] Of course, the small side surface can also be inclined at a certain angle to the horizontal plane, which is not expressly restricted here and falls within the scope of protection.

[0045] The distance D between the outer edge of the first section 110 and the terminal post 200 and the distance d1 between the outer edge of the second section 120 and the terminal post 200 are the dimensions in the same direction (the same one direction) relative to the cover plate surface 100. As in Fig. 3, in the present embodiment, the distance D between the outer edge of the first portion 110 and the terminal post 200 is the dimension along the horizontal direction; the distance d1 between the outer edge of the second portion 120 and the terminal post 200 is also the dimension along the horizontal direction.

[0046] To further improve the insulating effect, at least a portion of the surface of the housing 400 has an insulating coating. In the present embodiment, this at least portion of the surface of the housing 400 with an insulating coating can enclose the top surface of the battery. For example, a rectangular-prismatic battery has six outer surfaces, and the top surface of the battery is the surface enclosed by the longitudinal edge of the battery and the lateral edge of the battery.

[0047] It is also possible to apply an insulating coating to all other surfaces of the battery case except the cover plate surface 100 to ensure the insulating performance of other surfaces of the battery.

[0048] To facilitate processing and further improve insulation performance, the battery includes at least two terminal posts 200, including a positive terminal post and a negative terminal post, and the positive terminal post and the negative terminal post are located on the same surface of the battery. That is, it is only necessary to provide the terminal post 200 on one surface of the battery (the cover plate surface 100), and the other surfaces (the surface of the casing 400) can be provided with an insulating coating by spraying or other processing methods to achieve an insulating effect.

[0049] As in Fig.As shown in Figure 3, the cover plate surface 100 in the present embodiment has two terminal posts 200, namely a positive terminal post and a negative terminal post. In the present embodiment, the two terminal posts 200 are arranged in the height direction, which effectively reduces the risk of the two terminal posts 200 being wetted by water at the same time and further improves the insulation effect.

[0050] Since both the positive and negative terminal posts are located on the cover plate surface 100, heat buildup is easily generated on the cover plate, and the insulating adhesive layer is easily melted by the heat, increasing the risk of peeling of the insulating adhesive layer and the insulating plate 300. Therefore, 0.12 F / m≤(d1 / D)×K≤6.8 F / m. That is, the value range of (d1 / D)×K is 0.12 F / m-6.8 F / m, which can improve the bonding strength between the insulating adhesive layer and the insulating plate 300, thereby avoiding the risk of peeling of the insulating adhesive layer and the insulating plate 300 relative to the cover plate surface 100.

[0051] In order to improve the bonding effect of the insulating plate 300, the projected area of ​​the insulating plate 300 to the cover plate surface 100 overlaps with the edge of the projected area of ​​the insulating adhesive layer to the cover plate surface 100. That is, the edge of the insulating plate 300 is aligned with the edge of the insulating adhesive layer, that is, a gap between the edge of the insulating plate 300 and the cover plate surface 100 is avoided, and the insulating adhesive layer is prevented from overflowing the insulating plate 300, thereby ensuring the bonding effect of the insulating plate 300 and avoiding material waste of the insulating adhesive layer.

[0052] The battery further includes a cell located within the housing 400 and electrically connected to the terminal post 200. The housing 400 and the cover plate form a relatively enclosed cavity, and the cell is located within the cavity and electrically connected to the portion of the terminal post 200 that extends through the terminal post hole in the cover plate and projects into the cavity.

[0053] In some embodiments, the insulating adhesive layer is divided into a first adhesive layer and a second adhesive layer in a state where the insulating plate 300 is detached from the cover plate surface 100. The first adhesive layer is bonded to the cover plate surface 100, and the second adhesive layer is bonded to the insulating plate 300. The detachment 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 aging and deformation of the insulating plate 300, or by an external force acting on the insulating plate 300. Since the first adhesive layer is bonded to the cover plate surface 100 and the second adhesive layer is bonded to the insulating plate 300, the first adhesive layer ensures the insulating effect on the cover plate surface 100 when the insulating plate 300 detaches from the cover plate surface 100.

[0054] Of course, the material of the insulating plate 300 and the roughness of the contact surface between the insulating plate 300 and the insulating adhesive layer can also be adjusted so that the insulating adhesive layer is bonded to the cover plate surface 100 when the insulating plate 300 is detached from the cover plate surface 100 and the insulating plate 300 is separated from the insulating adhesive layer. There are no specific restrictions here.

[0055] To ensure that the insulating adhesive layer can be divided into the first adhesive layer and the second adhesive layer, the thickness of the insulating adhesive layer is preferably between 0.05 and 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.

[0056] An embodiment of the present invention further provides a battery pack comprising at least two batteries and a bus bar electrically connecting the terminal posts of the at least two batteries; at least one of the batteries is one of the aforementioned batteries.

[0057] Since the above-mentioned battery has the above-mentioned technical effects, the battery pack containing the above-mentioned battery should also have the same technical effects, which are not discussed in detail here.

[0058] In some embodiments, the terminal post 200 is located on the surface of the battery pack that is perpendicular to the horizontal plane when the battery pack is normally positioned. This means that the surface of the battery pack that is perpendicular to the horizontal plane when the battery pack is normally positioned may include the small side surfaces of multiple batteries. This means that when multiple batteries are present, the small side surfaces of the batteries have terminal posts 200 and lie on the same plane, forming a surface of the battery pack that is perpendicular to the horizontal plane.

[0059] Since the surface where the terminal post 200 is located is perpendicular to the horizontal plane (ground), the probability of the surface where the terminal post 200 is located being soaked with water can be effectively avoided, and the risk of peeling of the insulating adhesive layer and the insulating plate 300 is further reduced, so that 0.14 F / m≤(d1 / D)×K≤7 F / m can be achieved. That is, the value range of (d1 / D)×K is 0.14 F / m-7 F / m, which ensures the spraying efficiency of the insulating layer while avoiding the risk of peeling.

[0060] The various embodiments of the present utility model will be described step by step, with each embodiment focusing on the differences from other embodiments. Identical and similar parts between the embodiments may be referenced to one another.

[0061] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined in the present utility model may be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model is not limited to the embodiments shown in the present utility model, but corresponds to the widest possible scope consistent with the principles and novel features disclosed in the present utility model.

Claims

[1] Battery, comprising a housing (400) provided with a mounting hole at at least one end; a cover plate disposed in the mounting hole, wherein a cover plate surface (100) of the cover plate comprises a first portion (110) and a second portion (120), the first portion (110) is disposed along the perimeter of the second portion (120), the first portion (110) has an insulating coating, and the second portion (120) has an insulating adhesive layer; a terminal post (200) disposed on the cover plate; an insulating plate (300) connected to the cover plate surface (100) via an insulating adhesive layer; where 0.12 F / m≤(d1 / D)×K≤7 F / m K is the dielectric constant of the insulating adhesive layer; the shortest distance between the outer edge of the first section (110) and the terminal post (200) is D; the shortest distance between the outer edge of the second section (120) and the terminal post (200) is d1. [2] Battery according to claim 1, characterized by that the value range of K is 1 F / m-8 F / m. [3] Battery according to claim 1 or 2, characterized by that the insulating adhesive layer is an acrylate adhesive and the value range of K is 3.0 F / m-3.4 F / m; or the insulating adhesive layer is double-sided PET adhesive and the value range of K is 3.0 F / m-3.5 F / m; or the insulating adhesive layer is double-sided acrylic adhesive and the value range of K is 2.5 F / m-3.5 F / m. [4] Battery according to one of the preceding claims, characterized by that the first section (110) and the second section (120) do not overlap. [5] Battery according to one of the preceding claims, characterized by that the first section (110) and the second section (120) partially overlap and the width of the overlap section between the first section (110) and the second section (120) is in the range of 1-10 mm; the direction of the width of the overlap section is the extension direction of the shortest distance between the outer edge of the first section (110) and the terminal post (200). [6] Battery according to claim 5, characterized by that 0.12F / m≤(dl / D)×K≤6.8F / m. [7] Battery according to one of the preceding claims, characterized by that the thickness of the insulating adhesive layer is greater than the thickness of the insulating coating; and / or the thickness of the insulating adhesive layer is in the range of 0.05-0.9 mm; and / or the thickness of the insulating coating is in the range of 0.03-0.8 mm. [8] Battery according to one of the preceding claims, characterized by that the width (D-d1) of the first section (110) is between 1 mm and 18 mm; and / or the value range of d1 is 1 mm to 53 mm; and / or the value range of D is 2 mm to 55 mm; and / or the value range of d1 / D is 0.1 to 0.

9. [9] Battery according to one of the preceding claims, characterized by that the cover plate surface (100) is the small side surface of the battery, and that the small side surface is the side with the smallest area among the plurality of outer surfaces of the battery. [10] Battery according to one of the preceding claims, characterized by that at least part of the surface of the housing has the insulating coating. [11] Battery according to one of the preceding claims, characterized bythat the battery comprises at least two terminal posts (200) and the at least two terminal posts (200) comprise a positive terminal post and a negative terminal post and the positive terminal post and the negative terminal post are arranged on the same surface of the battery. [12] Battery according to claim 11, characterized by that 0.12F / m≤(dl / D)×K≤6.8F / m. [13] Battery according to one of the preceding claims, characterized by that the projected area of ​​the insulating plate (300) to the cover plate surface (100) overlaps with the edge of the projected area of ​​the insulating adhesive layer to the cover plate surface (100). [14] Battery according to one of the preceding claims, characterized by that the battery further comprises a cell located in the housing (400) and electrically connected to the terminal post (200). [15] Battery according to one of the preceding claims, characterized byin a state in which the insulating plate (300) is detached from the cover plate surface (100), the insulating adhesive layer is divided into a first adhesive layer and a second adhesive layer, the first adhesive layer is bonded to the cover plate surface (100), and the second adhesive layer is bonded to the insulating plate (300). [16] Battery pack, characterized by that it comprises at least two batteries and a busbar electrically connecting the terminal posts of the at least two batteries; at least one of the batteries is a battery according to any one of the preceding claims. [17] Battery pack according to claim 16, characterized by that the terminal post (200) is located on a surface of the battery pack that is perpendicular to a horizontal plane when the battery pack is normally placed. [18] Battery pack according to claim 16 or 17, characterized by that 0.14 F / m≤(dl / D)×K≤7 F / m.

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