Battery and battery pack with same

Abstract

The invention discloses a battery and a battery pack with the same, the battery comprises: a shell, the side surface of which is provided with an insulating coating; the side surface comprises two first surfaces which are oppositely arranged, and a blank area without an insulating coating is arranged on each first surface; the shell, the insulating coating and the blank areas on the two first surfaces meet the condition that 0.014 mm < = (S1 (D1 + D2)) / S2 < = 0.9 mm, S1 is the total area of the blank areas on the two first surfaces, the unit is mm2, S2 is the total area of the side surfaces, the unit is mm2, D1 is the thickness of the side surfaces, where the blank areas are arranged, of the shell in the direction perpendicular to the first surfaces, the unit is mm, and S2 is the thickness of the side surfaces, where the blank areas are arranged, of the shell in the direction perpendicular to the first surfaces. D2 is the thickness of the insulating coating in the direction perpendicular to the first surface, and the unit is mm. The battery is prevented from being deformed due to too large clamping force in the spraying process; and meanwhile, the insulating property of the battery shell after being sprayed can be ensured, and the failure risk of the battery is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery and a battery pack having the battery. Background Art

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

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

[0004] In order to solve the above problems, the object of the present invention is to provide a battery and a battery pack having the same, aiming to at least improve the problem of adverse effects on the battery caused by clamping during the battery spraying process.

[0005] In one aspect, the present invention provides a battery, comprising: a housing, an insulating coating provided on a side surface of the housing; the side surface comprising two first surfaces disposed opposite each other, a blank area on each of the first surfaces not provided with the insulating coating, wherein the housing, the insulating coating, and the blank areas on the two first surfaces satisfy the following conditions:

[0006] 0.014mm≤(S1(D1+D2)) / S2≤0.9mm

[0007] 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, 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, and D2 is the thickness of the insulating coating in the direction perpendicular to the first surface, in mm.

[0008] 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 an array.

[0009] According to the battery and battery pack provided by the present invention, by reasonably setting the size of the clamping area during spraying and the thickness of the insulating coating, on the one hand, the battery will not be deformed due to excessive clamping force during the spraying process. At the same time, it can also ensure the insulation performance of the battery shell after spraying, thereby reducing the risk of battery failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0011] Figure 1 is a schematic structural diagram of an exemplary battery of the present invention;

[0012] Figure 2 is a front view of an exemplary battery;

[0013] Figure 3 is a front view of another exemplary battery;

[0014] Figure 4 is a front view of another exemplary battery;

[0015] Figure 5 is a front view of another exemplary battery;

[0016] Figure 6 is a front view of another exemplary battery;

[0017] Figure 7 is a right side view of another exemplary battery;

[0018] Figure 8 is a right side view of another exemplary battery;

[0019] Figure 9 is a right side view of another exemplary battery;

[0020] Figure 10 is a right side view of another exemplary battery;

[0021] Figure 11 A right side view of another exemplary battery.

[0022] In the figure,

[0023] 100. Battery; 10. Housing; 11. Insulation coating; 12. Blank area; 20. Cover. DETAILED DESCRIPTION

[0024] In one related technique, when spraying an insulating coating on the outer surface of a battery casing, a spray gun is used to spray each of the multiple outer surfaces of the battery casing one by one. This spraying method has low spraying efficiency. In another related technique, the battery casing is clamped before spraying. This spraying method can spray multiple outer surfaces of the battery casing simultaneously, thereby improving spraying efficiency.

[0025] The inventors have discovered that when spraying after clamping the battery casing, the battery casing may be significantly deformed or have unsatisfactory insulation due to an unreasonable setting of the clamping area.

[0026] In order to solve the above problems, the inventors made many attempts and finally creatively proposed the following solution: by controlling the proportional relationship between the area of ​​the clamping area, the thickness of the battery shell, and the thickness of the insulating coating relative to the total area of ​​the battery side, the battery shell will not only not deform during the clamping process, but also ensure the insulating effect of the insulating coating after spraying, thereby reducing the risk of battery failure.

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, in the description of the present invention, the terms used are for illustrative purposes only and are not intended to limit the scope of the present invention. The terms "comprise" and / or "include" are used to specify the presence of the 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" and the like may be used to describe various elements, do not represent an order, and do not limit these elements. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. These terms are only used to distinguish one element from another. These and / or other aspects become apparent in conjunction with the following drawings, and it is easier for a person of ordinary skill in the art to understand the description of the embodiments of the present invention. The accompanying drawings are used to depict the embodiments of the present invention for illustrative purposes only. Those skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods shown in the present invention can be adopted without departing from the principles of the present invention.

[0030] For ease of understanding, in the accompanying drawings, the X-axis is the width direction of the battery, the Y-axis is the length direction of the battery, and the Z-axis is the height direction of the battery.

[0031] <Exemplary Battery>

[0032] like Figure 1 As shown, a battery 100 according to an embodiment of the present invention is shown. The overall structure of battery 100 is described below by way of example. It should be understood that the structure of battery 100 is not limited to the following description. For example, one or more of the elements described below may be omitted or replaced, and the layout relationships between certain elements may also be altered.

[0033] like Figures 2 to 11 As shown, the battery 100 includes a housing 10 and a cover plate 20 , wherein an insulating coating 11 and a blank area 12 are provided on the side surface of the housing 10 .

[0034] The battery 100 is a storage unit that can be repeatedly charged and discharged, and can be understood as a "secondary battery." In the present invention, the concept of "secondary battery" can include, but is not limited to, lithium-ion secondary batteries, sodium-ion secondary batteries, lead-acid batteries, and nickel-metal hydride batteries.

[0035] The battery 100 may be, for example, a prismatic battery or another type of battery having two opposing side surfaces. The side surfaces of the housing 10 may be understood to include, for example, all surfaces adjacent to the surfaces where the battery 100's terminals are located, or may also be understood to include surfaces perpendicular to the surfaces where the battery 100's terminals are located. The battery 100 of the present invention will be described in detail below using a prismatic battery as an example.

[0036] Continue to see Figures 2 to 11 The housing 10 can be understood as a cavity with an opening at one end for accommodating the battery cells (not shown) 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 referred to as the top surface, the surface of the housing 10 opposite to the cover plate 20 can be referred to as 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.

[0037] An insulating coating 11 is provided on the sides of the housing 10. It will be appreciated that the housing 10 is typically made of a metal material such as aluminum or steel, which enhances the overall strength of the battery, protects the cell structure from damage, and provides strong conductivity. Providing the insulating coating 11 on the sides of the housing 10 improves the insulation performance of the housing 10 and enhances the safety of the battery 100 during use.

[0038] The side surface of the housing 10 has two first surfaces disposed opposite to each other. The two first surfaces may be, for example, two surfaces disposed opposite to each other in the width direction of the battery 100 or two surfaces disposed opposite to each other in the length direction of the battery 100 .

[0039] A blank area 12 is provided on each of the two first surfaces. The blank area 12 can be understood as an area on the side of the shell 10 where the insulating coating 11 is not provided, that is, an exposed area of ​​the shell 10. The clamp can be clamped in the blank area 12 to achieve clamping of the battery 100. The better the clamping effect of the battery 100, the more effectively it can prevent the battery 100 from escaping or loosening from the clamp, so that the spraying device can better achieve spraying of the battery shell surface. It can be understood that setting the blank area 12 on the two opposite first surfaces can improve the stability of the clamping and prevent the battery 100 from falling off during the spraying process.

[0040] Preferably, the arrangements of the blank areas 12 on the two first surfaces correspond to each other; or, the orthographic projections of the two blank areas 12 on the first surface at least partially overlap.

[0041] That is, the blank areas 12 on the two first surfaces are equal in number and size, and the orthographic projections of the two blank areas 12 on the battery cell overlap. This allows the clamping forces on the two first surfaces to be balanced during the clamping process, ensuring the stability of the battery 100 clamping.

[0042] The orthographic projections of the two blank areas 12 on the first surface at least partially overlap. For example, it can be understood that the blank areas 12 on the two first surfaces can also be staggered. This can ensure that the blank areas 12 between adjacent batteries do not correspond after the batteries are grouped, thereby increasing the creepage distance between adjacent batteries and avoiding safety risks such as external short circuits in the battery 100 caused by overlapping metal shells.

[0043] Optionally, the blank area 12 can be a regular shape such as a square, circle, oval or diamond, or can be other irregular shapes. During use, the shape of the blank area 12 can be adaptively adjusted according to the shape of the fixture, and the present application does not specifically limit the shape of the blank area 12.

[0044] During the process of clamping and spraying the battery 100, the size of the blank area 12 will not only affect the size of the clamping force, but also affect the insulation performance of the battery 100 after spraying. For example, if the blank area 12 is set to be larger, the surface area of ​​the clamping force on the shell 10 will be larger, and the shell 10 will not be easily deformed during the clamping process; however, after the spraying is completed, the area of ​​the insulating coating 12 on the side of the shell 10 will be relatively small, which will have an adverse effect on the insulation performance of the battery 100. Conversely, if the blank area 12 is set to be smaller, the surface area of ​​the clamping force on the shell 10 will be smaller, and during the clamping process, the shell 10 will be deformed due to the larger clamping stress; however, after the spraying is completed, the area ratio of the insulating coating 12 on the side of the shell 10 will be relatively increased, and the insulation performance of the battery 100 will be improved.

[0045] The inventors found that the deformation problem of the shell 10 can be improved by increasing the thickness of the shell 10, but if the thickness of the shell 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 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.

[0046] Therefore, the inventors found that by properly setting the proportion of the blank area 12 on the side of the shell 10, the thickness of the insulating coating 11 and the thickness of the shell 10, the relationship between the deformation of the shell 10 and the insulation performance of the battery 100 can be balanced.

[0047] When the above three factors satisfy the following relationship, not only can the shell 10 be less likely to deform during the clamping process, but it can also ensure that the battery 100 has good insulation performance after the spraying is completed. If the formula range is too small, the area ratio of the blank area 12 and the overall thickness ratio of the shell 10 and the insulating coating 11 are too small, which makes the battery 100 easy to loosen or slip during the clamping process, and the spraying effect of the spray device on the outside of the shell 10 is poor, and the shell 10 is prone to deformation; if the formula range is too large, the area ratio of the blank area 12 and the overall thickness ratio of the shell 10 and the insulating coating 11 are too large, and the insulation risk between adjacent batteries 100 is greater due to the setting of the blank area 12, and there is a risk of overlapping short circuits.

[0048] 0.014mm≤(S1(D1+D2)) / S2≤0.9mm (1)

[0049] 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.

[0050] S2 is the total area of ​​the side, in mm 2 Taking a prismatic battery as an example, the side surfaces of the housing 10 have two sides arranged opposite each other in the length direction of the battery 100, which can be referred to as the left side and the right side; and two sides arranged opposite each other in the width direction of the battery 100, which can be referred to as the front side and the rear side. S2 is the sum of the areas of the front side, rear side, left side, and right side. Other types of batteries can also calculate S2 using the same calculation method as for prismatic batteries.

[0051] D1 is the thickness of the side of the housing 10 where the blank area 12 is provided, in a direction perpendicular to the first surface, in mm. It is understood that the housing 10 has a uniform thickness, meaning that the thickness is equal at all locations on the housing 10, or at least the thickness is equal at all locations on the side of the housing 10. D1 can be understood as the vertical distance from the inner side to the outer side at a certain location on the side of the housing 10.

[0052] D2 is the thickness of the insulating coating 11 perpendicular to the first surface, measured in mm. It is understood that the thickness of the insulating coating 12 should also be considered uniform, meaning that the thickness of the insulating coating 12 is the same at all locations. D2 can be understood as the vertical distance from a specific location on the insulating coating 12, from the side closest to the housing 10 to the side further away from the housing 10.

[0053] For ease of description, the above inequality is referred to as Formula 1 below. Optionally, the value range of Formula 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. The battery 100 that meets the above range can not only ensure that the shell 10 will not be deformed or slightly deformed without causing substantial impact on the battery 100 during the clamping process; it can also ensure the insulation performance of the battery 100 after the spraying is completed; in addition, the energy density of the battery 100 will also be within a relatively ideal range.

[0054] It is understandable that, on the basis that Formula 1 satisfies the above range, the thickness D2 of the insulating coating 11 satisfies a certain value range. For example, D2 satisfies: 0.08 mm ≤ D2 ≤ 0.25 mm.

[0055] Optionally, D2 may be 0.09 mm, 0.1 mm, 0.12 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.23 mm, or 0.24 mm, etc. The insulating coating 11 having the aforementioned thickness is not easily scratched during use of the battery 100 and can ensure the insulation performance of the battery 100. Furthermore, the energy density of the battery 100 is not adversely affected by excessive thickness, thereby keeping the energy density of the battery 100 within a relatively ideal range.

[0056] Similarly, the blank area 12 not only satisfies Formula 1, but also satisfies the following value range:

[0057] 1914mm 2≤S1≤90800mm 2 , and / or 0.05≤S1 / S2≤0.4.

[0058] That is, the blank area 12 satisfies at least one of the above two inequalities. For example, the total area S1 of the blank area 12 has a value range of 1914 mm 2 -90800mm 2 ; or the proportion of all blank areas 12 on the side of the shell 10 satisfies the value range of S1 / S2 of 0.05-0.4; or the blank area 12 satisfies both the proportion and size ranges.

[0059] The blank area 12 that meets the above area can make the surface of the clamping force of the clamp large enough, and will not cause serious deformation of the shell 10 during the clamping process; at the same time, the area of ​​the blank area 12 will not be too large, resulting in insufficient area of ​​the insulating coating 11, affecting the insulation performance of the battery 100.

[0060] Furthermore, on the basis of satisfying the range of formula 1, the side area and thickness of the housing 10 further satisfy the following value ranges:

[0061] 38280mm 2 ≤S2≤227000mm 2 , and / or 0.2mm≤D2≤2mm.

[0062] That is, the housing 10 satisfies at least one of the above two inequalities. For example, the range of the side area S2 of the housing 10 is 38280 mm 2 -227000mm 2 ; or the thickness D2 of the shell 10 has a value range of 0.2mm-2mm; or the side area S2 of the shell 10 and the thickness D2 of the shell 10 both satisfy the above two value ranges.

[0063] S2 satisfies the above range. On the one hand, the side area of ​​the shell 10 will not be too large, which can avoid the shell 10 itself from being deformed too much and the problem of deformation being more likely to occur during the clamping process. On the other hand, the side area of ​​the shell 10 will not be too small, which can avoid the battery 100 itself being too small. When it is integrated into the battery pack, the shell 10 will greatly affect the space utilization in the battery pack and reduce the energy density of the battery pack.

[0064] 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, multiple is at least two, that is, when the number of blank areas 12 on the first surface is multiple, the number can be two, three or four, etc. Providing a blank area 12 on each first surface can facilitate spraying, that is, all areas on the side of the shell 10 except the two blank areas 12 can be sprayed at the same time. In the case where there are multiple blank areas 12 on each first surface, the surface where the clamping force acts can be distributed more evenly on the first surface, that is, the force on the shell 10 is more evenly distributed, and the clamping stability is better, but 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, it can be comprehensively determined based on factors such as the size of the side area of ​​the shell 10 and the shape or size of the fixture. The present application does not specifically limit the number of blank areas 12 on each first surface.

[0065] In an optional embodiment, the side surface of the housing 10 further has two second surfaces that are opposite to each other, and the area of ​​the first surface is larger than that of the second surface.

[0066] See also Figure 2 , the blank area 12 is, for example, located in the center of the first surface. Still taking the prismatic battery as an example: that is, the blank area 12 is provided on the two larger side surfaces 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 center of these surfaces. This center area can be understood, for example, as the area radiating outward a certain distance from the intersection of the diagonals of the first surface as the center.

[0067] In this embodiment, the first surface has a relatively large area. After spraying, the insulating coating 11 covers a relatively large area of ​​the first surface, thereby providing the battery 100 with a better insulation effect. Furthermore, by locating the blank area 12 in the center of the first surface, the clamping force is evenly distributed across the entire first surface, avoiding the problem of clamping damage caused by excessive force in a certain area of ​​the first surface.

[0068] When the first surface is a larger side surface of the housing 10, it is necessary to increase the clamping area of ​​the first surface to better clamp the battery 100. In this case, the housing 10, the insulating coating 11 and the blank area 12 meet the following requirements:

[0069] 0.07mm≤(S1(D1+D2)) / S2≤0.9mm (2)

[0070] For ease of description, the above relationship is hereinafter referred to as Equation 2. That is, in this embodiment, when Equation 2 is within the range of 0.07-0.9, not only can the housing 10 be less likely to deform during the clamping process, but it can also ensure that the battery 100 has good insulation performance after spraying.

[0071] Optionally, the range of Formula 2 may 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. Formula 2 may also be selected from other appropriate ranges, and is not limited to the ranges listed above.

[0072] Alternatively, see Figures 3 to 6 , the blank area 12 can also be located in the edge area of ​​the first surface. That is, the blank area 12 is set on the first surface with a larger area, and is close to one edge of the first surface. The edge area can be understood as an area close to any one of the four sides of the first surface. There is a certain distance L2 between the blank area 12 and the edge, and 0mm<L2≤1.5mm. In this way, on the basis of improving the clamping strength, the risk of short circuit between adjacent batteries 100 due to edge contact can also be avoided.

[0073] It can be understood that the distance between the blank area 12 and the edge on the first surface to which it is close can be understood as the vertical distance between the edge and the side of the blank area 12 that is parallel to and closest to the edge. For example, when the blank area 12 is located in the upper edge area close to 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 and the side that is parallel to and closest to the upper edge and the upper edge (i.e., the distance between the upper edge of the blank area 12 and the upper edge of the first surface); for another example, when the blank area 12 is located in the lower edge area close to 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 and the side that is parallel to and closest to the lower edge and the 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 refer to the above description and will not be repeated here.

[0074] like Figure 3 As shown, the edge area can be understood as an area formed by taking the upper edge of the first surface as a starting point and extending downward by a certain distance in the height direction of the battery 100; Figure 4 As shown, the edge area can be understood as an area formed by taking the lower edge of the first surface as a starting point and extending upward by a certain distance in the height direction of the battery 100; Figure 5As shown, the edge area can be understood as an area formed by taking the right edge of the first surface as a starting point and extending a certain distance to the left in the length direction of the battery 100; Figure 6 The edge region may be understood as a region formed by taking the left edge of the first surface as a starting point and extending a certain distance to the right in the length direction of the battery 100 .

[0075] Preferably, continue to see Figure 3 , the blank area 12 is located in the edge area of ​​the first surface near the cover plate 20. That is to say, the blank area 12 is set in the area near the upper edge of the first surface. In this way, the clamping force of the clamp will be dispersed on the cover plate 20, and the cover plate 20 has a higher strength. The stability of the clamping can be improved to a certain extent, and the range of formula 1 can be appropriately adjusted. The inventors found that in this embodiment, the shell, the insulating coating and the blank area meet the following requirements:

[0076] 0.014mm≤(S1(D1+D2)) / S2≤0.7mm (3)

[0077] For ease of description, the above relationship is hereinafter referred to as Equation 3. That is, in this embodiment, when Equation 3 is within the range of 0.014-0.07, not only can the housing 10 be less likely to deform during the clamping process, but it can also ensure that the battery 100 has good insulation performance after spraying.

[0078] Optionally, the range of Formula 3 may be 0.016-0.6, 0.018-0.55, 0.02-0.0.5, 0.025-0.45, or 0.03-0.4, etc. Formula 3 may also be selected from other appropriate ranges, and is not limited to the ranges listed above.

[0079] In an optional embodiment, the side surface of the housing 10 further has two second surfaces that are opposite to each other, and the area of ​​the first surface is smaller than the area of ​​the second surface.

[0080] See also Figure 7 , the blank area 12 is located in the center of the first surface. Still taking the prismatic battery as an example: that is, the blank area 12 is provided on the two smaller side surfaces of the battery 100, i.e., on two surfaces opposite each other in the longitudinal direction of the battery 100, and the blank area 12 is located in the center of these surfaces. This center area can be understood, for example, as the area radiating outward a certain distance from the intersection of the diagonals of the first surface as the center.

[0081] In this embodiment, the first surface has a relatively small area, so the blank area 12 occupies a relatively large proportion of the first surface. This allows the clamping force to be more effectively distributed across the first surface, thereby reducing the risk of deformation of the housing 10 during clamping. Furthermore, by locating the blank area 12 in the center of the first surface, the clamping force is evenly distributed across the entire first surface, avoiding the problem of clamping damage caused by excessive force on a localized area of ​​the first surface.

[0082] It is precisely because the risk of deformation of the housing 10 during clamping is reduced that the range of Formula 1 can be appropriately adjusted. The inventors found that in this embodiment, the housing, the insulating coating, and the blank area meet the following requirements:

[0083] 0.03mm≤(S1(D1+D2)) / S2≤0.56mm (4)

[0084] For ease of description, the above relationship is hereinafter referred to as Equation 4. That is, in this embodiment, when Equation 4 is within the range of 0.03-0.56, not only can the housing 10 be less likely to deform during the clamping process, but it can also ensure that the battery 100 has good insulation performance after spraying.

[0085] Optionally, the range of Formula 4 may 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. Formula 4 may also be selected from other appropriate ranges, and is not limited to the ranges listed above.

[0086] Alternatively, see Figures 8 to 11 , the blank area 12 can also be set in the edge area close to the first surface. That is, the blank area 12 is set on the first surface with a smaller area and close to one edge of the first surface. The edge area can be understood as an area close to any one of the four edges of the first surface. There is a certain distance L3 between the blank area 12 and the edge, and 0mm<L3≤1.5mm. In this way, on the basis of improving the clamping strength, the risk of short circuit between adjacent batteries 100 due to edge contact can also be avoided.

[0087] It can be understood that the distance between the blank area 12 and the edge on the first surface to which it is close can be understood as the vertical distance between the edge and the side of the blank area 12 that is parallel to and closest to the edge. For example, when the blank area 12 is located in the upper edge area close to 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 and the side that is parallel to and closest to the upper edge and the upper edge (i.e., the distance between the upper edge of the blank area 12 and the upper edge of the first surface); for another example, when the blank area 12 is located in the lower edge area close to 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 and the side that is parallel to and closest to the lower edge and the 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 refer to the above description and will not be repeated here.

[0088] like Figure 8 As shown, the edge area can be understood as an area formed by taking the upper edge of the first surface as a starting point and extending downward by a certain distance in the height direction of the battery 100; Figure 9 As shown, the edge area can be understood as an area formed by taking the lower edge of the first surface as a starting point and extending upward by a certain distance in the height direction of the battery 100; Figure 10 As shown, the edge area can be understood as an area formed by taking the right edge of the first surface as a starting point and extending a certain distance to the left in the length direction of the battery 100; Figure 11 The edge region may be understood as a region formed by taking the left edge of the first surface as a starting point and extending a certain distance to the right in the length direction of the battery 100 .

[0089] Preferably, continue to see Figure 8 , the blank area 12 is located in the edge area of ​​the first surface near the cover plate 20. That is to say, the blank area 12 is set in the area near the upper edge of the first surface. In this way, the clamping force of the clamp will be dispersed on the cover plate 20, and the cover plate 20 has a higher strength. The stability of the clamping can be improved to a certain extent, and the range of formula 1 can be appropriately adjusted. The inventors found that in this embodiment, the shell, the insulating coating and the blank area meet the following requirements:

[0090] 0.014mm≤(S1(D1+D2)) / S2≤0.4mm (5)

[0091] For ease of description, the above relationship is hereinafter referred to as Equation 5. That is, in this embodiment, when Equation 5 is within the range of 0.14-0.4, not only can the housing 10 be less likely to deform during the clamping process, but it can also ensure that the battery 100 has good insulation performance after spraying.

[0092] Optionally, the range of Formula 5 may 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. Formula 5 may also select other appropriate ranges, and is not limited to the ranges listed above.

[0093] In an optional embodiment, the battery 100 further includes an explosion-proof valve disposed on a third surface of a vertical side surface of the housing 10. Furthermore, the blank area 12 is perpendicular to the third surface and has a distance L4 ≥ 4 mm from the third surface. For example, the third surface may be the surface on which the battery 100 terminals are located, or a surface disposed opposite the plane on which the battery 100 terminals are located.

[0094] It is understood that explosion-proof valves are generally thinned or defect-treated, meaning that the strength of the area where the explosion-proof valve is located is relatively low. Providing the blank area 12 at a distance of more than 4 mm from the plane where the explosion-proof valve is located can improve clamping stability and minimize deformation of the housing 10 in the blank area 12.

[0095] Optionally, the explosion-proof valve is disposed on the cover plate 20, or on the surface of the housing 10 opposite the cover plate 20, that is, on the bottom surface of the housing 10. Specifically, when the explosion-proof valve is disposed on the cover plate 20, the blank area 12 can be disposed at the edge of the first surface near the bottom edge; when the explosion-proof valve is disposed on the bottom surface of the housing 10, the blank area 12 can be disposed at the edge of the first surface near the cover plate 20.

[0096] In an optional embodiment, the battery 100 further includes an insulating film that covers the blank area 12. In this manner, the blank area 12 can be insulated by the insulating film, thereby improving the safety of the battery 100 during use. The insulating member can be, for example, an insulating diaphragm or an insulating coating.

[0097] The insulating membrane may be made of, for example, polyethylene terephthalate, polyimide, polypropylene, or acrylic adhesive. When the insulating membrane is an insulating coating, its material may be different from the insulating coating 11 on the side of the housing 10. The material may be, for example, polyethylene terephthalate, polyimide, mica, UV coating material, epoxy resin, or the like.

[0098] Furthermore, some areas of the insulating film overlap with the insulating coating 11. It is understood that the coverage area of ​​the insulating film is larger than the area of ​​the corresponding blank area 12, which can further improve the insulation effect of the battery 100. It is also 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.

[0099] Take the square blank area 12 as an example: for example, the upper edge of the insulating film extends on the first surface to above the upper edge of the blank area 12, so that 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 on the first surface to above the upper edge of the blank area 12 and below its lower edge, respectively, so that the upper and lower parts of the insulating film will overlap with the insulating coating 11; for 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 that the insulating film will overlap with the insulating coating 11 on the top, bottom, left and right.

[0100] <Exemplary Battery Pack>

[0101] An embodiment of the present invention further 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 an array.

[0102] In an optional embodiment, the blank areas 12 between two adjacent batteries 100 are arranged in a staggered arrangement. That is, the orthographic projection of the blank area 12 of one of the two adjacent batteries 100 on the first surface of the other battery 100 does not overlap with the blank area 12 on the first surface. This prevents the blank areas 12 of the two adjacent batteries 100 from contacting each other, thus avoiding the problem of short circuits caused by contact between the blank areas 12 of the two adjacent batteries 100.

[0103] In an optional embodiment, the blank areas 12 between two adjacent batteries 100 are arranged opposite each other. An insulating separator is provided between the two adjacent batteries 100, and the insulating separator covers the blank area 12. The insulating separator can isolate the two blank areas 12 between the two adjacent batteries 100. In this way, even if the blank areas 12 of the two batteries 100 are arranged opposite each other, they will not contact each other, thereby preventing the two adjacent batteries 100 from short-circuiting.

[0104] In an optional embodiment, the blank area 12 is close to the edge of the first surface close to the bottom plate, and the structural adhesive is at least partially located in the blank area 12. It is understandable that in this embodiment, the blank area 12 is located in the edge area of ​​the first surface close to the bottom edge. At this time, the structural adhesive will climb upward under the extrusion of the battery 100, so that part or all of the climbing structural adhesive is located in the blank area 12, and it can be partially or completely covered by the blank area 12. In this way, the insulation performance of the blank area 12 can be improved, and it may even be unnecessary to perform additional insulation treatment on the blank area 12, which can also save production costs to a certain extent.

[0105] The following will describe the effects of the housing 10 , the insulating coating 11 , and the blank area 12 on the performance of the battery 100 through specific embodiments.

[0106] The batteries 100 used in all embodiments are sample batteries from the same batch. The batteries 100 are clamped by the same fixture, and the insulating coating 11 is sprayed on the side of the shell 10 of each battery 100. The proportion of the blank area 12 on the first surface, the thickness of the shell 10, and the thickness of the insulating coating 11 are detailed in Table 1. Other process steps and process parameters are the same. During the spraying process, under each set of the same parameters, the battery 100 is clamped at four different positions. The four positions are:

[0107] Clamping solution A1: located in the central area of ​​the two large sides of the housing 10;

[0108] Clamping solution A2: located at the edge areas of the two large sides of the housing 10 close to the cover plate 20;

[0109] Clamping solution A3: located in the central area of ​​the two small side surfaces of the housing 10;

[0110] Clamping solution A4: located at the edge areas of the two small side surfaces of the housing 10 close to the cover plate 20 .

[0111] The specific test method is:

[0112] 1. Detection of deformation of the shell 10: During the clamping and spraying process of the above-mentioned battery samples, the clamping jaws of the clamping tooling are selected to have the same size structure according to the area of ​​the blank area 12, and the clamping force is 500N. After spraying is completed, check the surface of the shell 10 at the corresponding position of the blank area 12 to observe whether there are scratches, clamp marks, deformation, etc., and record the results in the table.

[0113] 2. Insulation test of battery 100: prepare four normal qualified batteries, spray the sides and bottom of the shell 10 with insulating coating with a thickness of 50 microns, attach a 0.2mm insulating patch to the cover 20, and leave a 5mm*5mm cover area on the insulating patch. All other performances meet the production requirements. At the same time, other structural forms are the same as the battery sample to be tested. Then select another battery sample mentioned above, place the four normal qualified batteries around the sample battery, and set a 3mm PC insulating pad between each adjacent battery. The upper surface of the PC insulating pad is flush with the upper surface of the corresponding battery. Connect the positive pole of the insulation withstand voltage tester to the bare leakage part of the cover 20 of the sample battery, and the negative pole is connected to the bare leakage parts of the covers of the four adjacent normal qualified batteries in turn. Start the tester and record the leakage current parameters of each test respectively, and record the largest one among the current parameters in the table.

[0114] The withstand voltage meter was adjusted to the DC voltage 4000V position for 60 seconds to obtain the maximum leakage current during the test in mA. A leakage current greater than 0.5 was considered unqualified. Table 1 Specific parameters of each embodiment Test results

[0115]

[0116]

[0117] In Examples 1 to 30, sample batteries with the same data in each group were sprayed using different clamping positions. After spraying, the surface of the battery shell in the clamping area was observed, and no signs of damage or deformation were found, meeting the design requirements for battery surface deformation. 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.

[0118] In the clamping scheme A1, the shell surface inspection and battery insulation performance of Examples 1 to 30 are qualified and meet the design requirements. Among them, it was found during the test that when the clamping area is located in the central area of ​​the large surface of the shell, in Examples 13 to 23, the shell will be slightly deformed due to the small proportion of the blank area. Although the surface of the sample battery after spraying did not deform or damage, it also affected the spraying effect during the spraying process. Since the overall area of ​​the large surface of the shell is large, and the exposed part is located in the middle, and the other four sides are covered with insulating coatings, the influence of slight deformation of the shell on the spraying can be avoided by increasing the area proportion of the blank area while meeting the insulation performance.

[0119] In the clamping scheme A2, the shell surface inspection and battery insulation performance of Examples 1 to 30 are all qualified and meet the design requirements. Among them, it was found during the test that when the clamping area is located near the edge of the large surface of the shell, the side of the shell also bears part of the force during clamping, and the clamped part of the shell is relatively strong, and no slight deformation will occur. However, in Examples 1 to 3, Examples 7 to 12, and Examples 24 to 26, due to the large proportion of the blank area and the exposed part of the battery surface is located at one edge of the shell, in the sample batteries under the same set of parameters, the insulation test data of the A2 clamping scheme are generally larger than the insulation test values ​​of the A1 clamping scheme. Although they are all within the qualified range, if the clamping conditions are met, a smaller proportion of the blank area can be selected to increase the proportion of the insulating coating, thereby enhancing the insulation protection performance of the battery.

[0120] In clamping schemes A3 and A4, the shell surface inspection and battery insulation performance of Examples 1 to 30 are all qualified and meet the design requirements. Since the clamping positions of these two schemes are located on two relatively small side surfaces of the shell, the area of ​​the side surfaces is smaller than that of the large surface, so the overall strength will be stronger than that of the large surface. However, the coverage area of ​​the insulating coating will also be relatively reduced, so when selecting the proportion of the blank area, the insulation performance needs to be considered under the premise of meeting the clamping conditions.

[0121] 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 acceptable, the thicker casing and insulating coating increase the weight and space occupied by the battery, affecting the energy density of the battery and battery pack.

[0122] 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 acceptable, the thinner casing and insulating coating can lead to risks of easy damage to the casing and scratching of the insulating coating during battery assembly and subsequent use in electrical equipment, thereby increasing the risk of thermal runaway.

[0123] In Comparative Examples 1-3, insulation performance tests of battery samples with identical process parameters and different clamping methods revealed that all sample batteries met the required insulation conditions. However, the surface of the battery casing was damaged and deformed due to clamping, compromising the structural safety of the battery cells within.

[0124] In Comparative Examples 3-6, insulation performance tests of battery samples with identical process parameters and different clamping methods revealed no clamping marks or deformation or damage on the surface of the battery cases. However, the batteries did not meet the insulation performance requirements during the insulation performance tests and were deemed unqualified.

[0125] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0126] Furthermore, persons of ordinary skill in the art will appreciate that although some embodiments described herein include certain features and not other features included in other embodiments, the combination of features from different embodiments is intended to be within the scope of the invention and to form different embodiments.

[0127] It will be appreciated by those skilled in the art that although the present invention has been described with reference to exemplary embodiments, various changes may be made and equivalents may be substituted for its elements without departing from the scope of the present invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present invention without departing from the essential scope of the present invention.

Claims

1. A battery, characterized in that: The invention comprises a shell, wherein the side surface of the shell is provided with an insulating coating; The side surface includes two first surfaces arranged opposite to each other, and a blank area on the first surface where no insulating coating is provided; The housing, the insulating coating, and the blank areas on the two first surfaces meet the following requirements: 0.014mm≤(S1(D1+D2)) / S2≤0.9mm 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, 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, and D2 is the thickness of the insulating coating in the direction perpendicular to the first surface, in mm.

2. The battery according to claim 1, wherein There are one or more blank areas on the first surface.

3. The battery according to claim 2, wherein The plurality of blank areas are spaced apart, and the interval L1 between two adjacent blank areas satisfies: 15mm≤L1≤60mm.

4. The battery according to claim 2, wherein The side surface further includes two second surfaces arranged opposite to each other, and the area of ​​the first surface is larger than the area of ​​the second surface.

5. The battery according to claim 4, wherein The blank area is located in the central area of ​​the first surface, and the housing, the insulating coating, and the blank areas on the two first surfaces meet the following requirements: 0.07mm≤(S1(D1+D2)) / S2≤0.9mm.

6. The battery according to claim 4, wherein At least one of the blank areas is close to an edge of the first surface, and a distance L2 between the blank area and the edge satisfies: 0mm<L2≤1.5mm.

7. The battery according to claim 6, wherein A cover plate is further included, at least one of the blank areas is close to an edge of the cover plate on the first surface, and the housing, the insulating coating, and the blank areas on the two first surfaces meet the following requirements: 0.014mm≤(S1(D1+D2)) / S2≤0.7mm.

8. The battery according to claim 2, wherein The side surface further includes two second surfaces arranged opposite to each other, and the area of ​​the first surface is smaller than the area of ​​the second surface.

9. The battery according to claim 8, wherein The blank area is located in the central area of ​​the first surface, and the housing, the insulating coating, and the blank areas on the two first surfaces meet the following requirements: 0.03mm≤(S1(D1+D2)) / S2≤0.56mm.

10. The battery according to claim 8, wherein At least one of the blank areas is close to an edge of the first surface, and a distance L3 between the blank area and the edge satisfies: 0mm<L3≤1.5mm.

11. The battery according to claim 10, wherein A cover plate is further included, wherein the blank area is close to an edge of the cover plate on the first surface, and the housing, the insulating coating, and the blank areas on the two first surfaces meet the following requirements: 0.014mm≤(S1(D1+D2)) / S2≤0.4mm.

12. The battery according to claim 1, wherein The insulating coating satisfies: 0.08mm≤D2≤0.25mm.

13. The battery according to claim 1, wherein The blank area meets the following requirements: 1914mm 2 ≤S1≤90800mm 2 , and / or 0.05≤S1 / S2≤0.

4.

14. The battery according to claim 1, wherein The housing satisfies: 38280mm 2 ≤S2≤227000mm 2 , and / or 0.2mm≤D2≤2mm.

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

16. The battery according to any one of claims 1 to 14, wherein: It also includes an insulating film, which covers the blank area and is connected to the blank area through an adhesive layer.

17. The battery according to claim 16, wherein A partial area of ​​the insulating film overlaps with a partial area of ​​the insulating coating layer.

18. The battery according to any one of claims 1 to 14, characterized in that The first surface is provided with a first blank area, and the other first surface opposite thereto is provided with a second blank area, and 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 according to any one of claims 1 to 14, and the plurality of batteries are arranged in an array.

20. The battery pack according to claim 19, wherein: Among the plurality of batteries, the blank areas between two adjacent batteries are arranged in a staggered manner.

21. The battery pack according to claim 19, wherein: Among the plurality of batteries, the blank areas between two adjacent batteries are arranged relative to each other; An insulating partition is provided between two adjacent batteries, and the insulating partition covers the blank area.

22. The battery pack according to claim 19, wherein: The blank area is close to an edge of the first surface close to the bottom plate, and the structural adhesive is at least partially located in the blank area.

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