A battery and a battery pack having the same

Abstract

The application discloses a battery and a battery pack with the same, the battery comprising: a shell, an insulating coating is arranged on the side surface of the shell; the side surface comprises two oppositely arranged first surfaces, and a blank area without the insulating coating is arranged on the first surface; the shell, the insulating coating and the blank area on the two first surfaces satisfy: 0.014mm≤(S1(D1+D2)) / S2≤0.9mm, wherein S1 is the total area of the blank area on the two first surfaces, with the unit of mm 2 , S2 is the total area of the side surface, with the unit of mm 2 , D1 is the thickness of the side surface of the shell where the blank area is arranged in the direction perpendicular to the first surface, with the unit of mm, and D2 is the thickness of the insulating coating in the direction perpendicular to the first surface, with the unit of mm. Thus, the battery will not be deformed due to excessive clamping force in the spraying process, meanwhile, the insulating performance of the battery shell after spraying can be ensured, and the failure risk of the battery is reduced.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to a battery and a battery pack having the battery. Background Technology

[0002] Batteries, as energy storage or power supply devices, are widely used in various electrical devices. To meet electrical safety requirements, the outer surface of the battery casing needs to be effectively insulated, for example, by spraying an insulating coating onto the outer surface of the battery casing.

[0003] Currently, to improve the efficiency of coating the outer surface of batteries, the batteries are often clamped before coating. However, clamping often has adverse effects on the batteries. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a battery and a battery pack having the same, which at least mitigates the adverse effects on the battery caused by clamping during the battery coating process.

[0005] On one hand, the present invention provides a battery comprising: a housing, wherein an insulating coating is provided on the side surface of the housing; the side surface includes two first surfaces disposed opposite each other, wherein there are blank areas on the first surfaces without the insulating coating, and the housing, the insulating coating, and the blank areas on the two first surfaces satisfy the following: 0.014mm≤(S1(D1+D2)) / S2≤0.9mm, 0.05≤S1 / S2≤0.4, Wherein, S1 is the total area of ​​the blank areas on the two first surfaces, in mm. 2 S2 is the total area of ​​the side surface, in mm. 2 D1 is the thickness of the side of the shell where the blank area is set in the direction perpendicular to the first surface, in mm; D2 is the thickness of the insulating coating in the direction perpendicular to the first surface, in mm.

[0006] On the other hand, the present invention also provides a battery pack, which includes a battery module and a base plate, wherein the battery module is bonded to the base plate by structural adhesive; the battery module includes a plurality of batteries as described above, and the plurality of batteries are arranged in a plurality of configurations.

[0007] According to the battery and battery pack provided by the present invention, by reasonably setting the size of the clamping area and the thickness of the insulating coating during spraying, the battery can be prevented from deforming due to excessive clamping force during the spraying process, and the insulation performance of the battery casing after spraying can be ensured, thereby reducing the risk of battery failure. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of an exemplary battery of the present invention.

[0010] Figure 2 This is a front view of an exemplary battery.

[0011] Figure 3 This is the front view of another exemplary battery.

[0012] Figure 4 This is the front view of another exemplary battery.

[0013] Figure 5 This is the front view of another exemplary battery.

[0014] Figure 6 This is the front view of another exemplary battery.

[0015] Figure 7 Right view of another exemplary battery.

[0016] Figure 8 Right view of another exemplary battery.

[0017] Figure 9 Right view of another exemplary battery.

[0018] Figure 10 Right view of another exemplary battery.

[0019] Figure 11 Right view of another exemplary battery.

[0020] In the picture, 100. Battery; 10. Casing; 11. Insulating coating; 12. Blank area; 20. Cover plate. Detailed Implementation

[0021] In one related technology, when spraying an insulating coating onto the outer surface of a battery casing, multiple outer surfaces of the battery casing are sprayed one by one using a spray gun. This spraying method has low spraying efficiency. In another related technology, the battery casing is clamped before spraying. This spraying method allows multiple outer surfaces of the battery casing to be sprayed simultaneously, thereby improving spraying efficiency.

[0022] The inventors discovered that in the method of spraying after clamping the battery casing, the battery casing often undergoes significant deformation or has unsatisfactory insulation due to improper clamping area settings.

[0023] To solve the above problems, the inventors made many attempts and finally creatively proposed the following solution: by controlling the ratio of the area of ​​the clamping region, the thickness of the battery casing, and the thickness of the insulating coating to the total area of ​​the side of the battery, the battery casing will not only not deform during clamping, but the insulating effect of the insulating coating after spraying can also be ensured, reducing the risk of battery failure.

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, the terminology used in the description of this invention is for illustrative purposes only and is not intended to limit the scope of the invention. The terms "comprising" and / or "including" are used to specify the presence of said elements, steps, operations, and / or components, but do not exclude the presence or addition of one or more other elements, steps, operations, and / or components. The terms "first," "second," etc., may be used to describe various elements, do not represent an order, and do not limit these elements. Moreover, in the description of this invention, unless otherwise stated, "a plurality of" means two or more. These terms are used only to distinguish one element from another. These and / or other aspects become apparent in conjunction with the following drawings, and those skilled in the art will more readily understand the description of the embodiments of the invention. The drawings are used for illustrative purposes only to depict the embodiments of the invention. Those skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods shown in the invention can be employed without departing from the principles of the invention.

[0027] For ease of understanding, in the attached diagram, the X-axis represents the width of the battery, the Y-axis represents the length of the battery, and the Z-axis represents the height of the battery.

[0028] <Example Battery> like Figure 1 As shown, an embodiment of the present invention describes a battery 100. The overall structure of the battery 100 will be illustrated below. It should be understood that the structure of the battery 100 is not limited to the following description. For example, one or more elements introduced below may be omitted or replaced, and the layout relationship between some of these elements may also be changed.

[0029] like Figures 2 to 11 As shown, the battery 100 includes a housing 10 and a cover plate 20, wherein the side of the housing 10 is provided with an insulating coating 11 and a blank area 12.

[0030] Battery 100 is an energy storage unit capable of repeated charging and discharging, and can be understood as a "secondary battery". In this invention, the concept of "secondary battery" can be, but is not limited to, lithium-ion secondary batteries, sodium-ion secondary batteries, lead-acid batteries, and nickel-metal hydride batteries, etc.

[0031] The battery 100 can be, for example, a prismatic battery, or other types of batteries with two opposing surfaces on its sides. The sides of the casing 10 can be understood as all surfaces adjacent to the surface where the terminals of the battery 100 are located, or as surfaces perpendicular to the surface where the terminals of the battery 100 are located. The battery 100 of the present invention will be described in detail below using a prismatic battery as an example.

[0032] See also Figures 2 to 11 The housing 10 can be understood, for example, as a cavity with an opening at one end, for accommodating the battery cell (not shown in the figure) of the battery 100. The cover plate 20 is used to seal the opening of the housing 10. The plane on which the cover plate 20 is located can be called the top surface, the surface of the housing 10 opposite to the cover plate 20 can be called the bottom surface, and all surfaces of the housing 10 located between the top surface and the bottom surface can be collectively referred to as the side surfaces of the housing 10, and the side surfaces here refer to the outer side surfaces of the housing 10.

[0033] An insulating coating 11 is provided on the side of the casing 10. It is understood that the casing 10 is generally made of metal materials such as aluminum or steel to improve the overall strength of the battery, prevent damage to the cell structure, and provide strong conductivity. Providing an insulating coating 11 on the side of the casing 10 can improve the insulation performance of the casing 10 and enhance the safety of the battery 100 during use.

[0034] The side of the housing 10 has two opposing first surfaces. The two first surfaces may be, for example, two surfaces opposing each other in the width direction of the battery 100, or two surfaces opposing each other in the length direction of the battery 100.

[0035] Blank areas 12 are provided on each of the two first surfaces. The blank areas 12 can be understood as areas on the sides of the casing 10 where the insulating coating 11 is not applied, i.e., exposed areas of the casing 10. The clamp can be held in the blank areas 12 to hold the battery 100. The better the clamping effect on the battery 100, the more effectively the battery 100 can be prevented from detaching or loosening from the clamp, allowing the spraying device to better achieve spraying on the surface of the battery casing. It is understood that setting the blank areas 12 on the two opposing first surfaces can improve the stability of the clamping and prevent the battery 100 from falling off during the spraying process.

[0036] Preferably, the blank areas 12 are arranged in a corresponding manner on the two first surfaces; or, the orthographic projections of the two blank areas 12 on the first surfaces at least partially overlap.

[0037] That is, the number and size of the blank areas 12 on the two first surfaces are equal, and the orthographic projections of the two blank areas 12 on the battery cell coincide. In this way, the clamping forces on the two first surfaces can be balanced during the clamping process of the battery 100, ensuring the stability of the battery 100 clamping.

[0038] The two blank areas 12 have at least partial overlap in their orthographic projections on the first surface. For example, it can be understood that the blank areas 12 on the two first surfaces can also be staggered. This ensures that the blank areas 12 between adjacent batteries do not correspond after the batteries are assembled, thereby increasing the creepage distance between adjacent batteries and avoiding safety risks such as external short circuits caused by metal casing overlap.

[0039] Optionally, the blank area 12 can be a regular shape such as square, circle, oval, or rhombus, or it can be other irregular shapes. It can be adapted to the shape of the fixture during use. This application does not specifically limit the shape of the blank area 12.

[0040] During the clamping and spraying process of the battery 100, the size of the blank area 12 not only affects the clamping force but also the insulation performance of the battery 100 after spraying. For example, if the blank area 12 is set to be large, the clamping force acts on the housing 10 over a larger area, making it less likely for the housing 10 to deform during clamping; however, after spraying, the area of ​​the insulating coating 11 on the side of the housing 10 will be relatively small, which will adversely affect the insulation performance of the battery 100. Conversely, if the blank area 12 is set to be small, the clamping force acts on the housing 10 over a smaller area, and the housing 10 will deform due to greater clamping stress during clamping; however, after spraying, the area ratio of the insulating coating 11 on the side of the housing 10 will be relatively higher, thus improving the insulation performance of the battery 100.

[0041] The inventors discovered that the deformation problem of the casing 10 can be improved by increasing the thickness of the casing 10, but if the thickness of the casing 10 is too large, it will have an adverse effect on the energy density of the battery 100; the insulation performance of the battery 100 can be improved by increasing the thickness of the insulating coating 11, but the thickness of the insulating coating 11 will also have an adverse effect on the energy density of the battery 100.

[0042] Therefore, the inventors discovered that by reasonably setting the proportion of the blank area 12 on the side of the casing 10, the thickness of the insulating coating 11, and the thickness of the casing 10, the relationship between the deformation of the casing 10 and the insulation performance of the battery 100 can be balanced.

[0043] When the above three factors satisfy the following relationship, not only can the housing 10 be less prone to deformation during clamping, but the battery 100 can also be guaranteed to have good insulation performance after spraying. If the formula range is too small, the area ratio of the blank area 12 and the total thickness ratio of the housing 10 and the insulating coating 11 will be too small, which will make the battery 100 easy to loosen or slip during clamping, the spraying effect of the spraying device on the exterior of the housing 10 will be poor, and the housing 10 will be prone to deformation. If the formula range is too large, the area ratio of the blank area 12 and the total thickness ratio of the housing 10 and the insulating coating 11 will be too large, which will lead to a greater risk of insulation between adjacent batteries 100 due to the setting of the blank area 12, and there is a greater risk of short circuit due to overlap.

[0044] 0.014mm≤(S1(D1+D2)) / S2≤0.9mm (1) Wherein, S1 is the total area of ​​the blank areas 12 on the two first surfaces, in mm. 2 S1 can be understood as the sum of the areas of the blank areas 12 on the two first surfaces. For example, if there are two blank areas 12 on the two first surfaces, then S1 is the sum of the areas of the two blank areas 12; if there are four blank areas 12 on the two first surfaces, then S1 is the sum of the areas of the four blank areas 12; if there are six blank areas 12 on the two first surfaces, then S1 is the sum of the areas of the six blank areas 12, and so on.

[0045] S2 is the total area of ​​the side surface, in mm. 2 Taking a prismatic battery as an example, the casing 10 has two surfaces opposite each other along the length of the battery 100, which can be called the left side and the right side; it also has two surfaces opposite each other along the width of the battery 100, which can be called the front side and the rear side. S2 is the sum of the areas of the front side, the rear side, the left side, and the right side. Other types of batteries can also calculate S2 using the same method as for prismatic batteries.

[0046] D1 represents the thickness of the side surface of the shell 10 with the blank area 12 in the direction perpendicular to the first surface, in mm. It can be understood that the shell 10 has a uniform thickness, meaning the thickness is equal at all locations, or at least equal at all locations on the side surface of the shell 10. D1 can also be understood as the vertical distance from the inner to the outer side surface at a certain location on the side surface of the shell 10.

[0047] D2 is the thickness of the insulating coating 11 in the direction perpendicular to the first surface, in mm. It can be understood that the thickness of the insulating coating 11 should also be considered a uniform thickness, meaning the thickness of the insulating coating 11 is equal at all locations. D2 can be understood as the vertical distance at a certain location of the insulating coating 11 from the side closest to the housing 10 to the side furthest from the housing 10.

[0048] For ease of description, the above inequality will be referred to as Equation 1 below. Optionally, the value range of Equation 1 can also be 0.015-0.85, 0.018-0.7, 0.02-0.6, 0.025-0.5, 0.03-0.4, 0.035-0.3, 0.04-0.3, 0.05-0.2, 0.06-0.2, 0.07-0.25, 0.08-0.2, or 0.1-0.2, etc. A battery 100 that meets the above range can not only ensure that the casing 10 will not deform or undergo slight deformation that will not substantially affect the battery 100 during the clamping process; it can also ensure the insulation performance of the battery 100 after the coating is completed; in addition, the energy density of the battery 100 will also be within a relatively ideal range.

[0049] It is understandable that, based on Equation 1 satisfying the above range, the thickness D2 of the insulating coating 11 satisfies a certain range of values. For example, D2 satisfies: 0.08mm ≤ D2 ≤ 0.25mm.

[0050] Optionally, D2 can be 0.09mm, 0.1mm, 0.12mm, 0.14mm, 0.15mm, 0.16mm, 0.18mm, 0.2mm, 0.22mm, 0.23mm, or 0.24mm, etc. An insulating coating 11 meeting the above thicknesses is less prone to scratches during the use of the battery 100 and ensures the insulation performance of the battery 100; furthermore, excessive thickness will not adversely affect the energy density of the battery 100, thus keeping the energy density of the battery 100 within a relatively ideal range.

[0051] Similarly, in addition to satisfying Equation 1, the blank area 12 also satisfies the following range of values: 1914mm 2 ≤S1≤90800mm 2And / or 0.05≤S1 / S2≤0.4.

[0052] That is, the blank area 12 must satisfy at least one of the above two inequalities. For example, the total area S1 of the blank area 12 can take values ​​ranging from 1914 mm. 2 -90800mm 2 Alternatively, the proportion of all blank areas 12 on the side of the shell 10 satisfies the value range of S1 / S2, which is 0.05-0.4; or the blank areas 12 simultaneously satisfy both the proportion and size ranges.

[0053] The blank area 12 that meets the above requirements can make the clamping force of the fixture large enough so that the shell 10 will not be severely deformed during the clamping process; at the same time, it will not make the area of ​​the blank area 12 too large, resulting in insufficient area of ​​the insulating coating 11 and affecting the insulation performance of the battery 100.

[0054] Furthermore, in addition to satisfying the range of Equation 1, the side surface area and thickness of the shell 10 further satisfy the following range of values: 38280mm 2 ≤S2≤227000mm 2 And / or 0.2mm≤D1≤2mm.

[0055] That is, the shell 10 must satisfy at least one of the above two inequalities. For example, the lateral surface area S2 of the shell 10 can be in the range of 38280 mm². 2 -227000mm 2 Alternatively, the thickness D1 of the shell 10 may be in the range of 0.2mm - 2mm; or the side area S2 of the shell 10 and the thickness D1 of the shell 10 may both satisfy the above two ranges.

[0056] S2 satisfies the above range. On the one hand, it will not make the side area of ​​the housing 10 too large, which can avoid the housing 10 itself having a large deformation amount and being more prone to deformation during clamping. On the other hand, it will not make the side area of ​​the housing 10 too small, which can avoid the battery 100 itself being too small. When it is integrated into the battery pack, the housing 10 will greatly affect the space utilization rate of the battery pack and reduce the energy density of the battery pack.

[0057] It should be noted that there is at least one blank area 12 on each first surface. That is, the number of blank areas 12 on each first surface can be one or more. Among them, there are at least two, that is, when there are multiple blank areas 12 on the first surface, the number can be two, three, or four, etc. Setting one blank area 12 on each first surface facilitates spraying, that is, all areas on the side of the housing 10 except for the two blank areas 12 can be sprayed simultaneously. When there are multiple blank areas 12 on each first surface, the application surface of the clamping force can be more evenly distributed on the first surface, that is, the force on the housing 10 is more uniform and the clamping stability is better. However, the area between adjacent blank areas 12 also needs to be sprayed, and the spraying process is more complicated than the spraying process involving only one blank area 12. In use, the number of blank areas 12 on each first surface can be determined comprehensively based on factors such as the size of the side area of ​​the housing 10 and the shape or size of the clamp. This application does not make a special limitation on the number of blank areas 12 on each first surface.

[0058] In one alternative embodiment, the side of the housing 10 also has two opposing second surfaces, the area of ​​the first surface being larger than the area of ​​the second surface.

[0059] See Figure 2 The blank area 12 is, for example, located in the central region of the first surface. Taking a prismatic battery as an example again: that is, the blank area 12 is disposed on the two larger sides of the battery 100, i.e., on two surfaces opposite each other in the width direction of the battery 100, and the blank area 12 is located in the central region of that surface. This central region can be understood, for example, as the area formed by radiating outwards a certain distance from the intersection of the diagonals of the first surface.

[0060] In this embodiment, the first surface has a relatively large area. After the coating is applied, the area covered by the insulating coating 11 on the first surface is also relatively large, thus the battery 100 has a better insulation effect. At the same time, by placing the blank area 12 in the center of the first surface, the clamping force is evenly distributed across the entire surface of the first surface, avoiding the problem of clamping damage caused by excessive local force on the first surface.

[0061] When the first surface is a larger side surface of the housing 10, the clamping area of ​​the first surface needs to be increased to better clamp the battery 100. At this time, the housing 10, the insulating coating 11, and the blank area 12 satisfy the following: 0.07mm≤(S1(D1+D2)) / S2≤0.9mm (2) For ease of description, the above relationship will be referred to as Equation 2 below. That is, in this embodiment, when Equation 2 is in the range of 0.07-0.9, not only can the housing 10 be less prone to deformation during clamping, but the battery 100 can also be ensured to have good insulation performance after spraying.

[0062] Optionally, the range of Equation 2 can be 0.08-0.85, 0.1-0.8, 0.25-0.8, 0.25-0.75, 0.3-0.7, 0.35-0.65, 0.4-0.6, 0.4-0.55, or 0.45-0.5, etc. Equation 2 can also choose other appropriate ranges, and is not limited to the ranges listed above.

[0063] Alternatively, see Figures 3 to 6 The blank area 12 can also be located at the edge of the first surface. That is, the blank area 12 is placed on the first surface with a large area and is close to one edge of the first surface. This edge area can be understood, for example, as the area close to any one of the four edges of the first surface. The blank area 12 and this edge have a certain distance L2, such that 0mm < L2 ≤ 1.5mm. In this way, while improving the clamping strength, the risk of short circuit due to edge contact between adjacent batteries 100 can also be avoided.

[0064] It can be understood that the distance between the blank area 12 and its nearest edge on the first surface can be interpreted as the perpendicular distance between the blank area 12 and the edge whose parallel edge is closest to that edge, and that edge. For example, when the blank area 12 is located near the upper edge of the first surface, the distance between the blank area 12 and the upper edge can be understood as the distance between the blank area 12 and the upper edge whose parallel edge is closest to the upper edge, and that upper edge (i.e., the distance between the upper edge of the blank area 12 and the upper edge of the first surface); as another example, when the blank area 12 is located near the lower edge of the first surface, the distance between the blank area 12 and the lower edge can be understood as the distance between the blank area 12 and the lower edge whose parallel edge is closest to the lower edge, and that lower edge (i.e., the distance between the lower edge of the blank area 12 and the lower edge of the first surface). When the blank area 12 is located in other areas, the distance between the blank area 12 and the corresponding edge on the first surface can be referred to the above explanation, and will not be repeated here.

[0065] like Figure 3 As shown, the edge region can be understood as the area formed by extending downwards a certain distance along the height direction of the battery 100, starting from the upper edge of the first surface; for example... Figure 4 As shown, the edge region can be understood as the area formed by extending upwards a certain distance along the height direction of the battery 100, starting from the lower edge of the first surface; for example... Figure 5As shown, the edge region can be understood as the area extending a certain distance to the left along the length of the battery 100, starting from the right edge of the first surface; for example... Figure 6 The edge region can be understood as the region formed by extending a certain distance to the right along the length direction of the battery 100, starting from the left edge of the first surface.

[0066] For the preferred option, please continue reading. Figure 3 The blank area 12 is located on the first surface near the edge of the cover plate 20. That is, the blank area 12 is located on the first surface near the upper edge. In this way, the clamping force of the clamp is distributed across the cover plate 20, and the cover plate 20 has high strength. This can improve the stability of the clamping to a certain extent, and thus allow for appropriate adjustment of the range of Equation 1. The inventors have found that in this embodiment, the housing, the insulating coating, and the blank area satisfy the following: 0.014mm≤(S1(D1+D2)) / S2≤0.7mm (3) For ease of description, the above relationship will be referred to as Equation 3 below. That is, in this embodiment, when Equation 3 is in the range of 0.014-0.7, it can not only prevent the housing 10 from deforming during the clamping process, but also ensure that the battery 100 has good insulation performance after the coating is completed.

[0067] Optionally, the range of Equation 3 can be 0.016-0.6, 0.018-0.55, 0.02-0.05, 0.025-0.45, or 0.03-0.4, etc. Equation 3 can also choose other appropriate ranges, not limited to those listed above.

[0068] In one alternative embodiment, the side of the housing 10 also has two opposing second surfaces, the area of ​​the first surface being smaller than the area of ​​the second surface.

[0069] See Figure 7 The blank area 12 is located in the central region of the first surface. Taking a prismatic battery as an example again: that is, the blank area 12 is located on two smaller sides of the battery 100, i.e., on two surfaces opposite each other along the length of the battery 100, and the blank area 12 is located in the central region of that surface. This central region can be understood, for example, as the area radiating outwards from the intersection of the diagonals of the first surface at a certain distance.

[0070] In this embodiment, the first surface has a relatively small area, resulting in a relatively large proportion of the blank area 12 on the first surface. This allows the clamping force to be more effectively distributed across the first surface, reducing the risk of deformation of the housing 10 during clamping. Furthermore, by positioning the blank area 12 in the center of the first surface, the clamping force is evenly distributed across the entire surface, preventing localized damage caused by excessive force on the first surface.

[0071] Because the risk of deformation of the housing 10 is reduced during clamping, the range of Formula 1 can be adjusted appropriately. The inventors discovered that in this embodiment, the housing, insulating coating, and blank area satisfy the following: 0.03mm≤(S1(D1+D2)) / S2≤0.56mm (4) For ease of description, the above relationship will be referred to as Equation 4 below. That is, in this embodiment, when Equation 4 is in the range of 0.03-0.56, not only can the housing 10 be less prone to deformation during clamping, but the battery 100 can also be ensured to have good insulation performance after spraying.

[0072] Optionally, the range of Equation 4 can be 0.04-0.5, 0.05-0.45, 0.06-0.4, 0.07-0.35, 0.08-0.3, 0.09-0.25, 0.1-0.2, 0.12-0.25, or 0.15-0.2, etc. Equation 4 can also choose other appropriate ranges, and is not limited to the ranges listed above.

[0073] Alternatively, see Figures 8 to 11 The blank area 12 can also be set in the edge region near the first surface. That is, the blank area 12 is set on the first surface with a smaller area and is placed near one edge of the first surface. This edge region can be understood, for example, as the region near any one of the four edges of the first surface. The blank area 12 and this edge have a certain distance L3, such that 0mm < L3 ≤ 1.5mm. In this way, while improving the clamping strength, the risk of short circuit due to edge contact between adjacent batteries 100 can also be avoided.

[0074] It can be understood that the distance between the blank area 12 and its nearest edge on the first surface can be interpreted as the perpendicular distance between the blank area 12 and the edge whose parallel edge is closest to that edge, and that edge. For example, when the blank area 12 is located near the upper edge of the first surface, the distance between the blank area 12 and the upper edge can be understood as the distance between the blank area 12 and the upper edge whose parallel edge is closest to the upper edge, and that upper edge (i.e., the distance between the upper edge of the blank area 12 and the upper edge of the first surface); as another example, when the blank area 12 is located near the lower edge of the first surface, the distance between the blank area 12 and the lower edge can be understood as the distance between the blank area 12 and the lower edge whose parallel edge is closest to the lower edge, and that lower edge (i.e., the distance between the lower edge of the blank area 12 and the lower edge of the first surface). When the blank area 12 is located in other areas, the distance between the blank area 12 and the corresponding edge on the first surface can be referred to the above explanation, and will not be repeated here.

[0075] like Figure 8 As shown, the edge region can be understood as the area formed by extending downwards a certain distance along the height direction of the battery 100, starting from the upper edge of the first surface; for example... Figure 9 As shown, the edge region can be understood as the area formed by extending upwards a certain distance along the height direction of the battery 100, starting from the lower edge of the first surface; for example... Figure 10 As shown, the edge region can be understood as the area extending a certain distance to the left along the length of the battery 100, starting from the right edge of the first surface; for example... Figure 11 The edge region can be understood as the region formed by extending a certain distance to the right along the length direction of the battery 100, starting from the left edge of the first surface.

[0076] For the preferred option, please continue reading. Figure 8 The blank area 12 is located on the first surface near the edge of the cover plate 20. That is, the blank area 12 is located on the first surface near the upper edge. In this way, the clamping force of the clamp is distributed across the cover plate 20, and the cover plate 20 has high strength. This can improve the stability of the clamping to a certain extent, and thus allow for appropriate adjustment of the range of Equation 1. The inventors have found that in this embodiment, the housing, the insulating coating, and the blank area satisfy the following: 0.014mm≤(S1(D1+D2)) / S2≤0.4mm (5) For ease of description, the above relationship will be referred to as Equation 5 below. That is, in this embodiment, when Equation 5 is in the range of 0.014-0.4, it can not only prevent the housing 10 from deforming during the clamping process, but also ensure that the battery 100 has good insulation performance after the coating is completed.

[0077] Optionally, the range of Equation 5 can be 0.016-0.35, 0.018-0.3, 0.02-0.25, 0.03-0.2, 0.05-0.15, 0.06-0.1, 0.08-0.1, 0.09-0.25, or 0.1-0.2, etc. Equation 5 can also choose other appropriate ranges, and is not limited to the ranges listed above.

[0078] In one optional embodiment, the battery 100 further includes an explosion-proof valve disposed on a third surface of the vertical side of the housing 10. Meanwhile, the distance L4 between the blank area 12 and the third surface in the direction perpendicular to the third surface is ≥ 4 mm. For example, the third surface can be the surface where the battery 100's terminals are located, or a surface disposed opposite to the plane where the battery 100's terminals are located.

[0079] It is understandable that explosion-proof valves are generally thinned or have defects addressed, meaning that the strength of the area where the explosion-proof valve is located is relatively low. Setting the blank area 12 at a distance of more than 4mm from the plane where the explosion-proof valve is located can improve the stability of clamping and also minimize the deformation of the housing 10 at the blank area 12.

[0080] Optionally, the explosion-proof valve can be installed on the cover plate 20, or on the surface of the housing 10 opposite to the cover plate 20, i.e., on the bottom surface of the housing 10. Specifically, when the explosion-proof valve is installed on the cover plate 20, the blank area 12 can be located on the edge area near the bottom edge of the first surface; when the explosion-proof valve is installed on the bottom surface of the housing 10, the blank area 12 can be located on the edge area near the cover plate 20 of the first surface.

[0081] In one alternative embodiment, the battery 100 further includes an insulating film covering the blank area 12. This allows the blank area 12 to be insulated, improving the safety performance of the battery 100 during use. The insulating element can be, for example, an insulating separator or an insulating coating.

[0082] The insulating diaphragm can be, for example, polyethylene terephthalate, polyimide, polypropylene, or acrylic adhesive. When the insulating diaphragm is an insulating coating, its material can be different from the insulating coating 11 on the side of the housing 10. Its material can be, for example, polyethylene terephthalate, polyimide, mica, UV coating material, epoxy resin, etc.

[0083] Furthermore, a portion of the insulating film overlaps with the insulating coating 11. It can be understood that the area covered by the insulating film is larger than the area of ​​its corresponding blank area 12, thus further improving the insulation effect of the battery 100. Simultaneously, it can also be understood that the thickness of the overlapping portion of the insulating film and the insulating coating 11 is greater than the thickness of the other overlapping portions of the insulating film.

[0084] Taking a square blank area 12 as an example: for example, the upper edge of the insulating film extends above the upper edge of the blank area 12 on the first surface, so the upper part of the insulating film will overlap with the insulating coating 11; for another example, the upper edge and lower edge of the insulating film extend above the upper edge of the blank area 12 and below its lower edge on the first surface, so the upper and lower parts of the insulating film will overlap with the insulating coating 11; for yet another example, the extension distance of the four edges of the insulating film on the first surface is greater than the extension distance of the four sides of the corresponding blank area 12 on the first surface, so the insulating film will overlap with the insulating coating 11 on all sides.

[0085] <Example Battery Pack> This invention also provides a battery pack, including a battery module and a base plate, wherein the battery module is bonded to the base plate by structural adhesive; the battery module includes a plurality of batteries 100 as described above, and the plurality of batteries 100 are arranged in a plurality of configurations.

[0086] In one optional embodiment, the blank areas 12 between adjacent batteries 100 are staggered. That is, the orthographic projection of the blank area 12 of one adjacent battery 100 onto the first surface of the other battery 100 does not overlap with the blank area 12 on that first surface. This prevents the blank areas 12 of adjacent batteries 100 from contacting each other, avoiding the problem of short circuits caused by contact between adjacent batteries 100.

[0087] In one optional embodiment, among the plurality of batteries 100, the blank areas 12 between two adjacent batteries 100 are arranged opposite each other; an insulating partition is provided between two adjacent batteries 100, and the insulating partition covers the blank areas 12. The insulating partition can isolate the two blank areas 12 arranged opposite each other between two adjacent batteries 100, so that even if the blank areas 12 of two batteries 100 are arranged opposite each other, they will not contact each other, thereby avoiding short circuit between two adjacent batteries 100.

[0088] In one alternative embodiment, the blank area 12 is located near the edge of the first surface close to the bottom plate, and the structural adhesive is at least partially located within the blank area 12. It is understood that in this embodiment, the blank area 12 is located at the edge region of the first surface near the bottom edge. In this case, the structural adhesive will rise upwards under the pressure of the battery 100, so that the risen structural adhesive is partially or completely located within the blank area 12, thus partially or completely covering the blank area 12. This can improve the insulation performance of the blank area 12, and may even eliminate the need for additional insulation treatment of the blank area 12, thereby saving production costs to some extent.

[0089] The following specific embodiments will illustrate the impact of the casing 10, insulating coating 11, and blank area 12 on the performance of the battery 100.

[0090] All batteries 100 used in all embodiments were from the same batch of sample batteries. The batteries 100 were held in the same clamp, and an insulating coating 11 was sprayed onto the side of the casing 10 of each battery 100. The percentage of the blank area 12 on the first surface, the thickness of the casing 10, and the thickness of the insulating coating 11 are detailed in Table 1. Other processes and parameters were the same. During the spraying process, under each set of identical parameters, the battery 100 was clamped at four different locations. These four locations were: Clamping scheme A1: Located in the central area of ​​the two large sides of the housing 10; Clamping scheme A2: Located on the two large sides of the housing 10 near the edge of the cover plate 20; Clamping scheme A3: Located in the central area of ​​two small side surfaces of housing 10; Clamping scheme A4: Located on the two small sides of the housing 10 near the edge of the cover plate 20.

[0091] The specific testing method is as follows: 1. Deformation detection of housing 10: During the clamping and spraying process of the above battery sample, the clamping jaws of the clamping fixture are selected with the same size structure according to the area of ​​the blank area 12, and the clamping force is 500N. After the spraying is completed, check the surface of housing 10 at the corresponding position of the blank area 12 to observe whether there are scratches, clamping marks, deformation, etc., and record the results in the table.

[0092] 2. Insulation test of battery 100: Prepare four normal and qualified batteries. Spray an insulating coating on the sides and bottom of the casing 10, with a coating thickness of 50 micrometers. Attach a 0.2mm insulating patch to the cover plate 20, with 5mm of the insulating patch protruding. All other performance characteristics of the 5mm cover plate area meet production requirements, and other structural forms are the same as those of the battery sample to be tested. Select another battery sample as described above, and place four normal qualified batteries around the sample battery. Place a 3mm PC insulating pad between each adjacent battery, with the upper surface of the PC insulating pad flush with the upper surface of the corresponding battery. Connect the positive terminal of the insulation withstand voltage tester to the exposed part of the cover plate 20 of the sample battery, and connect the negative terminal to the exposed parts of the cover plates of the four adjacent normal qualified batteries in turn. Start the tester and record the leakage current parameters for each test. Record the largest current parameter in the table.

[0093] In this test, the withstand voltage gauge was set to the 4000V DC voltage range for 60 seconds, and the maximum leakage current (in mA) was measured. A leakage current greater than 0.5 mA was considered unqualified. Table 1 shows the test results for specific parameters in each embodiment. In Examples 1-30, sample batteries with the same data were sprayed using different clamping positions. After spraying, the surface of the battery casing in the clamping area was observed and no damage or deformation was found, which met the design requirements for the amount of deformation on the battery surface. In the insulation test, no breakdown or leakage occurred in the sample batteries, and the insulation performance between any two adjacent batteries met the design requirements, with no risk of insulation failure.

[0094] In clamping scheme A1, the surface inspection and battery insulation performance of Examples 1-30 were all qualified, meeting the design requirements. However, during the testing, it was found that when the clamping area was located in the center of the large surface area of ​​the casing, in Examples 13-23, slight deformation of the casing occurred due to the small proportion of the unused area. Although no deformation or damage occurred on the surface of the sample battery after spraying, it still affected the spraying effect. Since the overall area of ​​the large surface area of ​​the casing is large, and the exposed portion is located in the center while the other four sides are covered with an insulating coating, the impact of slight casing deformation on the spraying can be avoided by increasing the proportion of the unused area, provided that the insulation performance is met.

[0095] In clamping scheme A2, the shell surface inspection and battery insulation performance of Examples 1-30 were all qualified, meeting the design requirements. During the test, it was found that when the clamping area was located near the edge of the shell's large surface, the shell side also bore some force during clamping, resulting in high strength in the clamped portion of the shell and no slight deformation. However, in Examples 1-3, 7-12, and 24-26, due to the larger proportion of the unused area and the exposed battery surface located at one edge of the shell, the insulation test data for the A2 clamping scheme were generally larger than those for the A1 clamping scheme in the sample batteries under the same set of parameters. Although all were within the acceptable range, under the condition of meeting the clamping requirements, a smaller proportion of the unused area could be selected to increase the proportion of the insulating coating, thereby enhancing the battery's insulation protection performance.

[0096] In clamping schemes A3 and A4, the surface inspection of the casing and the battery insulation performance of Examples 1-30 are all qualified, meeting the design requirements. Since the clamping positions in both schemes are located on two relatively small sides of the casing, the area of ​​the sides is smaller than the larger surface, resulting in greater overall strength. However, the coverage area of ​​the insulating coating is also relatively smaller. Therefore, when selecting the proportion of the blank area, insulation performance needs to be considered while meeting the clamping conditions.

[0097] In Examples 23, 29, and 30, the battery casing and insulating coating are relatively thick. Although the battery casing surface is intact and the insulation performance is qualified, the thicker casing and insulating coating increase the battery's weight and the space occupied in the middle, which affects the energy density of the battery and the battery pack.

[0098] In Examples 26-28, the battery casing and insulating coating are relatively thin. Although the battery casing surface is intact and the insulation performance is qualified, the thin casing and insulating coating may lead to risks such as easy damage to the casing and easy scratching of the insulating coating during battery assembly and subsequent use of electrical equipment, thereby increasing the risk of battery thermal runaway.

[0099] In Comparative Examples 1-3, insulation performance tests on battery samples with the same process parameters but different clamping methods revealed that all samples met the requirements and insulation conditions. However, the battery casing surface was damaged and deformed due to clamping, affecting the structural safety of the internal battery cells.

[0100] In Comparative Examples 3-6, during the insulation performance tests of battery samples with the same process parameters but different clamping methods, no clamping marks or deformation damage were found on the surface of the battery casings. However, the batteries did not meet the insulation performance requirements during the insulation performance test, and the test results were unqualified.

[0101] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0102] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the invention and form different embodiments.

[0103] Those skilled in the art will understand that although the invention has been described with reference to exemplary embodiments, various changes may be made and its elements may be substituted with equivalents without departing from the scope of the invention. Furthermore, many modifications may be made to adapt particular situations or materials to the teachings of the invention without departing from the essential scope of the invention.

Claims

1. A battery, characterized in that, Includes a housing, the side of which is provided with an insulating coating; The side surface includes two first surfaces arranged opposite each other, and there are blank areas on the first surfaces without an insulating coating; The housing, the insulating coating, and the blank areas on the two first surfaces satisfy the following: 0.014mm≤(S1(D1+D2)) / S2≤0.9mm, 0.05≤S1 / S2≤0.4, Wherein, S1 is the total area of ​​the blank areas on the two first surfaces, in mm. 2 S2 is the total area of ​​the side surface, in mm. 2 D1 is the thickness of the side of the housing where the blank area is set in the direction perpendicular to the first surface, in mm; D2 is the thickness of the insulating coating in the direction perpendicular to the first surface, in mm.

2. The battery as described in claim 1, characterized in that, The blank areas on the first surface are provided with one or more.

3. The battery as described in claim 2, characterized in that, Multiple blank areas are spaced apart, and the interval L1 between two adjacent blank areas satisfies: 15mm≤L1≤60mm.

4. The battery as described in claim 2, characterized in that, The side also includes two second surfaces disposed opposite to each other, wherein the area of ​​the first surface is larger than the area of ​​the second surface.

5. The battery as described in claim 4, characterized in that, The blank area is located in the central region of the first surface, and the blank areas of the shell, the insulating coating, and the two first surfaces satisfy the following: 0.07mm≤(S1(D1+D2)) / S2≤0.9mm.

6. The battery as described in claim 4, characterized in that, At least one of the blank areas is adjacent to an edge of the first surface, and the distance L2 between the blank area and the edge satisfies: 0mm<L2≤1.5mm.

7. The battery as described in claim 6, characterized in that, It also includes a cover plate, at least one of the blank areas being adjacent to the edge of the cover plate on the first surface, and the housing, the insulating coating, and the blank areas on the two first surfaces satisfy the following: 0.014mm≤(S1(D1+D2)) / S2≤0.7mm.

8. The battery as described in claim 2, characterized in that, The side also includes two second surfaces disposed opposite each other, wherein the area of ​​the first surface is smaller than the area of ​​the second surface.

9. The battery as claimed in claim 8, characterized in that, The blank area is located in the central region of the first surface, and the blank areas of the shell, the insulating coating, and the two first surfaces satisfy the following: 0.03mm≤(S1(D1+D2)) / S2≤0.56mm.

10. The battery as claimed in claim 8, characterized in that, At least one of the blank areas is adjacent to an edge of the first surface, and the distance L3 between the blank area and the edge satisfies: 0mm<L3≤1.5mm.

11. The battery as claimed in claim 10, characterized in that, It also includes a cover plate, the blank area being close to the edge of the cover plate on the first surface, and the shell, the insulating coating, and the blank areas on the two first surfaces satisfy the following: 0.014mm≤(S1(D1+D2)) / S2≤0.4mm.

12. The battery as claimed in claim 1, characterized in that, The insulating coating satisfies: 0.08mm≤D2≤0.25mm.

13. The battery as claimed in claim 1, characterized in that, The blank area satisfies: 1914mm 2 ≤S1≤90800mm 2 。 14. The battery as claimed in claim 1, characterized in that, The shell satisfies: 38280mm 2 ≤S2≤227000mm 2 , and / or 0.2mm≤D1≤2mm.

15. The battery according to any one of claims 1-14, characterized in that, It also includes an explosion-proof valve, which is disposed on the third surface of the housing perpendicular to the side surface, and the distance L4 of the blank area from the third surface along the direction perpendicular to the third surface is ≥4mm.

16. The battery according to any one of claims 1-14, characterized in that, It also includes an insulating film that covers the blank area and is bonded to the blank area by an adhesive layer.

17. The battery as claimed in claim 16, characterized in that, A portion of the insulating film overlaps with a portion of the insulating coating.

18. The battery according to any one of claims 1-14, characterized in that, The first surface has a first blank area, and the other first surface has a second blank area. The orthographic projections of the first blank area and the second blank area on the first surface at least partially overlap.

19. A battery pack, characterized in that, It includes a battery module and a base plate, wherein the battery module is bonded to the base plate by structural adhesive; The battery module includes a plurality of batteries as described in any one of claims 1-14, and the plurality of batteries are arranged in an array.

20. The battery pack as claimed in claim 19, characterized in that, In the plurality of batteries, the blank areas between two adjacent batteries are arranged in an alternating pattern.

21. The battery pack as claimed in claim 19, characterized in that, In the plurality of batteries, the blank areas between two adjacent batteries are arranged opposite to each other; An insulating partition is provided between two adjacent batteries, and the insulating partition covers the blank area.

22. The battery pack as claimed in claim 19, characterized in that, The blank area is located near the edge of the first surface close to the base plate, and the structural adhesive is at least partially located within the blank area.

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