Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises a battery shell, a battery cover and a battery cover, the pole assembly is arranged on the top wall; the first part covers at least part of the side wall, the second part extends out from the first part, an overlapping part is formed on the second part, the overlapping part comprises at least two layers of second parts, the second parts are connected in a bonding manner, and the peeling strength between the second parts is s; wherein in the thickness direction of the battery, the width size of the top wall is a, the width size of the orthographic projection of the part, located on the outer side of the top wall, of the pole assembly on the top wall is b, the width size of the second part is c, and when b / a is larger than or equal to 0.5, c * s is 0.4 N-8N, the situation that the overlapped part tilts to drive the whole second part to tilt can be avoided, and the risk that the second part warps is reduced; and the reliable over-current capability of the pole assembly can be ensured, so that the safe use performance of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] In the related art, a battery may include a cell and a pole assembly, and the cell and the pole assembly are electrically connected. In order to meet the battery's demand for overcurrent capacity, the size of the battery's pole assembly is getting larger and larger. Therefore, the blue film used to cover the outside of the battery is prone to warping, thereby affecting the safety performance of the battery. Utility Model Content

[0003] The utility model provides a battery to improve the use performance of the battery.

[0004] The utility model provides a battery, comprising:

[0005] A battery housing, the battery housing comprising a side wall and a top wall, the side wall and the top wall being connected;

[0006] A pole assembly, the pole assembly is arranged on the top wall, and at least a part of the pole assembly is located outside the top wall;

[0007] An insulating film, the insulating film is disposed on the outer surface of the battery housing, the insulating film includes a first part and a second part, the first part covers at least a part of the side wall, the second part extends from the first part and covers a part of the top wall, the second part is formed with an overlapping part, the overlapping part includes at least two layers of second parts, and the second parts are bonded and connected, and the peel strength between the second parts is s;

[0008] Among them, along the thickness direction of the battery, the width dimension of the top wall is a, the width dimension of the positive projection of the part of the pole assembly located outside the top wall on the top wall is b, the width dimension of the second part is c, and when b / a≥0.5, c×s is 0.4N-8N.

[0009] The battery of the utility model embodiment includes a battery shell, a pole assembly and an insulating film. The pole assembly is arranged on the top wall of the battery shell, thereby occupying a certain space of the top wall, and the first part of the insulating film covers at least part of the side wall, and the second part extends from the first part to cover part of the top wall. The overlapping part formed by the second part includes at least two layers of second parts, and the second parts are bonded and connected, thereby ensuring the connection ability between the overlapping parts and reducing the risk of warping of the second part. The peel strength between the second parts is s, along the thickness direction of the battery, the width dimension of the top wall is a, the width dimension of the positive projection of the part of the pole assembly located outside the top wall on the top wall is b, and the width dimension of the second part is c. When b / a≥0.5, c×s is 0.4N-8N, thereby avoiding the warping of the overlapping part and driving the overall warping of the second part, reducing the risk of warping of the second part, and ensuring that the pole assembly can have a reliable current capacity, thereby improving the safe use performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0011] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0012] Figure 2 is a schematic diagram of an exploded structure of a battery according to an exemplary embodiment;

[0013] Figure 3 is a schematic diagram of an exploded structure of a battery according to another exemplary embodiment;

[0014] Figure 4 is a schematic structural diagram of a battery according to a first exemplary embodiment;

[0015] Figure 5 is a schematic structural diagram of a battery according to a second exemplary embodiment;

[0016] Figure 6 is a schematic structural diagram of a battery according to a third exemplary embodiment.

[0017] The following are the descriptions of the reference numerals:

[0018] 10. Battery case; 11. Side wall; 12. Top wall; 20. Post assembly; 30. Insulating film; 31. First part; 32. Second part; 321. Long side segment; 322. Short side segment; 33. Overlapping part. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0020] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0021] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0022] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0023] An embodiment of the present utility model provides a battery, please refer to Figures 1 to 6The battery comprises: a battery housing 10, the battery housing 10 comprises a side wall 11 and a top wall 12, the side wall 11 and the top wall 12 are connected; a pole assembly 20, the pole assembly 20 is arranged on the top wall 12, and at least a part of the pole assembly 20 is located outside the top wall 12; an insulating film 30, the insulating film 30 is arranged on the outer surface of the battery housing 10, the insulating film 30 comprises a first part 31 and a second part 32, the first part 31 covers at least a part of the side wall 11, and the second part 32 extends from the first part 31, And covers the portion of the top wall 12, the second portion 32 forms an overlapping portion 33, the overlapping portion 33 includes at least two layers of second portions 32, and the second portions 32 are bonded and connected, and the peel strength between the second portions 32 is s; wherein, along the thickness direction of the battery, the width dimension of the top wall 12 is a, the width dimension of the positive projection of the portion of the pole assembly 20 located outside the top wall 12 on the top wall 12 is b, the width dimension of the second portion 32 is c, and when b / a≥0.5, c×s is 0.4N-8N.

[0024] A battery according to an embodiment of the utility model includes a battery case 10, a pole assembly 20 and an insulating film 30. The pole assembly 20 is arranged on the top wall 12 of the battery case 10, thereby occupying a certain space of the top wall 12. The first part 31 of the insulating film 30 covers at least a part of the side wall 11, and the second part 32 extends from the first part 31 to cover a part of the top wall 12. The overlapping part 33 formed by the second part 32 includes at least two layers of the second part 32, and the second parts 32 are bonded to each other, thereby ensuring the connection ability between the overlapping parts 33 and reducing the risk of warping of the second part 32. The peel strength between the second part 32 is s, and along the thickness direction of the battery, the width dimension of the top wall 12 is a, the width dimension of the positive projection of the part of the pole assembly 20 located outside the top wall 12 on the top wall 12 is b, and the width dimension of the second part 32 is c. When b / a≥0.5, c×s is 0.4N-8N, thereby avoiding the overlapping part 33 from warping and causing the second part 32 to warp as a whole, reducing the risk of warping of the second part 32, and ensuring that the pole assembly 20 can have a reliable current-carrying capacity, thereby improving the safe use performance of the battery.

[0025] It should be noted that if Figure 2 and Figure 3 As shown, the battery housing 10 includes a side wall 11 and a top wall 12 connected to each other, and the pole assembly 20 is arranged on the top wall 12, and at least part of the pole assembly 20 is located outside the top wall 12, so that when the subsequent batteries are grouped, the pole assembly 20 can be conveniently electrically connected to the busbar. The battery housing 10 is formed with a chamber for accommodating a battery cell, and at least part of the pole assembly 20 is located outside the top wall 12, that is, at least part of the pole assembly 20 is located outside the top wall 12 away from the chamber.

[0026] like Figure 1 As shown, the insulating film 30 is disposed on the outer surface of the battery housing 10 , that is, the insulating film 30 can be coated on the outer side of the battery housing 10 away from the chamber, thereby forming insulating protection for the battery housing 10 , and the insulating film 30 can be a blue film.

[0027] Combination Figures 1 to 3 As shown, the insulating film 30 includes a first part 31 and a second part 32, the first part 31 covers at least a part of the side wall 11, and the second part 32 extends from the first part 31 and covers a part of the top wall 12, that is, the second part 32 extends from the first part 31 and is folded to form a folded edge, which is used to cover a part of the top wall 12, thereby maximizing the insulation protection of the battery.

[0028] Combination Figure 1 , Figures 4 to 6 As shown, the second part 32 is formed with an overlapping part 33, and the overlapping part 33 includes at least two layers of the second part 32, that is, at least two layers of the second part 32 are overlapped, thereby eliminating the need to cut the second part 32, and improving the manufacturing efficiency of the battery to a certain extent. By bonding the overlapping second parts 32, the fixing ability of the overlapping part 33 can be guaranteed, and the overall fixing ability of the second part 32 can be prevented from being affected by the warping of the overlapping part 33.

[0029] Combination Figure 4 As shown, along the thickness direction of the battery, the width dimension of the top wall 12 is represented as a, the width dimension of the orthographic projection of the portion of the pole assembly 20 located outside the top wall 12 on the top wall 12 is represented as b, and the width dimension of the second portion 32 is represented as c. The thickness direction of the battery can be represented as X, and the battery can include a battery cell, which is disposed in the battery housing 10, and the thickness direction of the battery is perpendicular to the large surface of the battery cell; or, the thickness direction of the battery is perpendicular to the large surface of the battery housing 10. Figure 4 The a indicated in φ includes the thickness of the insulating film 30 , and during measurement, the insulating film 30 may be removed before measurement.

[0030] The larger the size of the pole assembly 20 in the battery thickness direction, the smaller the folding space of the insulating film 30, the easier it is for the folding edge to warp, that is, the easier it is for the second part 32 to warp, and the smaller the size of the second part 32, the easier it is for the stacked second parts 32 to warp, thereby driving the entire second part 32 to warp, and by controlling the peeling strength s between the second parts 32, it is ensured that the second part 32 is not easy to warp. When the ratio of the width dimension b of the positive projection of the part of the pole assembly 20 located outside the top wall 12 on the top wall 12 to the width dimension a of the top wall 12 is controlled within a certain range, the product of the width dimension c of the second part 32 and the peeling strength s between the second parts 32 is set within a certain range, which can not only ensure the current capacity of the pole assembly 20, but also ensure that the second part 32 is not easy to warp, thereby reliably improving the safe use performance of the battery.

[0031] The ratio of the width dimension b of the orthographic projection of the portion of the pole assembly 20 located outside the top wall 12 on the top wall 12 to the width dimension a of the top wall 12 may be 0.5, 0.51, 0.52, 0.53, 0.54, 0.55 or 0.56, etc.

[0032] The product of the width dimension c of the second portion 32 and the peel strength s between the second portions 32 may be 0.4N, 0.45N, 0.5N, 0.55N, 0.6N, 0.7N, 0.8N, 0.9N, 1N, 1.5N, 2N, 2.5N, 3N, 3.5N, 4N, 4.5N, 5N, 5.5N, 6N, 6.5N, 7N, 7.5N or 8N, etc.

[0033] In one embodiment, when the width dimension a of the top wall 12 is ≤72 mm, c×s is 0.4N-4N, that is, when the overall thickness of the battery is less than a certain size, that is, when the thickness of the battery cell inside the battery casing 10 is less than a certain size, at this time, considering that the thickness of the battery cell is relatively thin and the size of the pole assembly 20 accounts for a larger proportion, the width dimension c of the second part 32 will be relatively smaller. Therefore, the upper limit of the product between the width dimension c of the second part 32 and the peel strength s between the second part 32 can be smaller.

[0034] The width dimension a of the top wall 12 can be 72mm, 70mm, 68mm, 65mm, 62mm, 60mm, 58m, 56mm, 55mm, 52mm, 50mm, 45mm, 40mm or 35mm, etc.

[0035] In one embodiment, there is an arc transition between the side wall 11 and the top wall 12, and the insulating film 30 covers the arc. When the R angle of the arc is ≤3mm, c×s is 1.2N-8N, that is, the smaller the R angle of the arc, the easier it is for the second part 32 of the insulating film 30 to be folded, so the peel strength s between the second parts 32 can be relatively larger, and the lower limit of the product of the width dimension c of the second part 32 and the peel strength s between the second parts 32 can be higher.

[0036] The R angle of the arc can be 3mm, 2.9mm, 2.8mm, 2.5mm, 2.2mm, 2mm, 1.8mm, 1.5mm or 1mm, etc.

[0037] In one embodiment, the Mohs hardness of the second part 32 is 4-6, and c×s is 1.6N-4N. Therefore, the Mohs hardness of the second part 32 can be controlled to control the product of the width dimension c of the second part 32 and the peel strength s between the second parts 32, thereby reducing the risk of the second part 32 warping and appropriately controlling the width dimension c of the second part 32.

[0038] When the Mohs hardness of the second part 32 is relatively small, the width dimension c of the second part 32 may be slightly smaller. When the Mohs hardness of the second part 32 is relatively large, the width dimension c of the second part 32 may be slightly larger, thereby ensuring that the second part 32 is not easily folded.

[0039] The Mohs hardness of the second portion 32 may be 4, 4.2, 4.5, 4.8, 5, 5.2, 5.5, 5.8 or 6, etc.

[0040] In one embodiment, the thickness of the second part 32 is 80μm-200μm, and c×s is 1.8N-4N. On the basis of ensuring that the second part 32 has a certain structural strength, the fixing ability of the second part 32 can also be guaranteed, reducing the risk of the second part 32 warping, thereby improving the safe use performance of the battery.

[0041] When the thickness of the second part 32 is relatively small, the width dimension c of the second part 32 may be slightly smaller. When the thickness of the second part 32 is relatively large, the width dimension c of the second part 32 should be relatively larger to ensure that the second part 32 is not easily folded.

[0042] The thickness of the second portion 32 may be 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm, 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm, 155μm, 160μm, 165μm, 170μm, 175μm, 180μm, 185μm, 190μm, 195μm or 200μm, etc.

[0043] In one embodiment, along a direction perpendicular to the thickness of the battery and parallel to the top wall 12, the length of the overlapping portion 33 is d, d is 1 mm-10 mm, and c×s is 2N-4N. Therefore, by controlling the length d of the overlapping portion 33, the product of the width dimension c of the second portion 32 and the peel strength s between the second portion 32 can be adjusted to maximize the fixing ability of the second portion 32.

[0044] Combination Figure 4 As shown, along the direction perpendicular to the thickness of the battery and parallel to the top wall 12, the length of the overlapping portion 33 can be expressed as d. When the length d of the overlapping portion 33 is small, the peel strength s between the second portions 32 is larger to ensure that the folded edge is not easily folded. When the length d of the overlapping portion 33 is large, the peel strength s between the second portions 32 can be relatively small, thereby balancing the fixing ability and installation convenience of the second portion 32.

[0045] The length d of the overlapping portion 33 may be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm or 10 mm, etc.

[0046] In one embodiment, the width dimension c of the second part 32 is 1 mm-5 mm, and the fixing ability of the second part 32 can be ensured by controlling the width dimension c of the second part 32, and it can also be avoided that the width dimension c of the second part 32 is too large to interfere with the pole assembly 20, thereby causing the end of the second part 32 to be unable to be reliably fixed, which may affect the stability of the second part 32 and is not conducive to cost control.

[0047] The width dimension c of the second portion 32 may be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm, etc.

[0048] In one embodiment, the peel strength s between the second parts 32 is 10N / 25mm-40N / 25mm, thereby ensuring that the overlapping part 33 can be reliably fixed, reducing the possibility of the overlapping part 33 warping, and thereby improving the overall fixing ability of the second part 32.

[0049] The peel strength s between the second portions 32 may be 0.4 N / mm, 0.5 N / mm, 0.6 N / mm, 0.8 N / mm, 1 N / mm, 1.1 N / mm, 1.2 N / mm, 1.3 N / mm, 1.4 N / mm, 1.5 N / mm or 1.6 N / mm, etc.

[0050] The peel strength s between the second parts 32 can be measured by a peel strength tester. The selection of the peel strength tester is not limited here and can be selected according to the adhesive between the second parts 32. For example, a 180-degree peel strength tester is used to pull the second part 32 to move 10 mm, and the force used in the process is 10 N, then the peel strength s between the second parts 32 can be 1 N / mm.

[0051] In one embodiment, Figure 4 and Figure 5 As shown, the overlapping portion 33 may include two layers of second portions 32. During the process of bending the insulating film 30 to form the second portion 32, the second portion 32 may be cut, thereby allowing the two layers of second portions 32 to overlap, thereby avoiding the cutting process during the assembly process.

[0052] In one embodiment, Figure 6 As shown, the overlapping portion 33 includes three layers of the second portion 32, that is, during the process of bending the insulating film 30 to form the second portion 32, the second portion 32 is not cut. At this time, the portion located at the upper part can basically form a triangular stacking structure, thereby pressing down the single-layer second portion 32 located at the lower part, thereby significantly improving the assembly efficiency of the insulating film 30.

[0053] In one embodiment, Figure 3 As shown, the top wall 12 is a cover plate, that is, the top wall 12 is a structure that can be independent of the side wall 11. When manufacturing the battery, the top wall 12 and the side wall 11 can be formed independently and then connected. For example, the top wall 12 and the side wall 11 can be welded.

[0054] The battery housing 10 may further include a bottom wall corresponding to the top wall 12 . The bottom wall and the side wall 11 may be an integrally formed structure, or the bottom wall may be a structure independent of the side wall 11 , which is not limited here.

[0055] It should be noted that, in some embodiments, it is not excluded that the top wall 12 and the side wall 11 are integrally formed structures, such as Figure 2 shown.

[0056] In one embodiment, Figure 5 As shown, the battery is a quadrangular prism battery, and the second part 32 includes a long side segment 321 and a short side segment 322. The long side segment 321 extends along the length direction of the battery, and the short side segment 322 extends along the thickness direction of the battery. Part of the long side segment 321 covers part of the short side segment 322 to form an overlapping portion 33. The long side segment 321 and the short side segment 322 are bonded and connected, and the peel strength between the long side segment 321 and the short side segment 322 is s, thereby ensuring that the long side segment 321 can reliably press the short side segment 322, and the warping of the middle area of ​​the long side segment 321 is less likely to be transmitted to the overlapping portion 33 than the warping of the middle area of ​​the short side segment 322, thereby avoiding the risk of the second part 32 being warped as a whole, thereby ensuring the fixing stability of the second part 32.

[0057] Combination Figure 5 As shown, the second portion 32 includes a long side segment 321 and a short side segment 322. There are two long side segments 321 and two short side segments 322, respectively. The two long side segments 321 are arranged opposite to each other, and the two short side segments 322 are arranged opposite to each other. The long side segments 321 and the short side segments 322 form an overlapping portion 33 in the corner area.

[0058] Combination Figure 4 As shown, the length direction of the battery can be represented as Y.

[0059] In one embodiment, the portion of the long side segment 321 covering the short side segment 322 includes two layers of second portions 32 , that is, when the insulating film 30 is folded, the end of the long side segment 321 can be roughly folded into a triangle, thereby covering the short side segment 322 .

[0060] In one embodiment, the portion of the long side segment 321 covering the short side segment 322 includes a second portion 32 , that is, when the insulating film 30 is folded, the long side segment 321 and the short side segment 322 can be cut apart, thereby achieving the covering of the short side segment 322 by the long side segment 321 .

[0061] In one embodiment, the second part 32 is bonded to the top wall 12, and the peel strength between the second part 32 and the top wall 12 is greater than s, thereby ensuring that the second part 32 can be reliably connected to the top wall 12, reducing the risk of the second part 32 warping, thereby improving the safe use performance of the battery.

[0062] The battery case 10 may be a metal case, for example, the battery case 10 may include steel, aluminum, copper, or the like.

[0063] It should be noted that the battery includes a cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, the stacked portion including a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0064] In one embodiment, the battery may be a quadrangular prism battery. A quadrangular prism battery mainly refers to a battery having a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0065] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0066] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0067] In one embodiment, the battery may be a cylindrical battery, or the battery may be a hexagonal prism battery. The battery may be a wound battery, that is, a first pole piece, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

[0068] An embodiment of the utility model further provides a battery pack, comprising the above-mentioned battery.

[0069] A battery of a battery pack according to an embodiment of the utility model comprises a battery case 10, a pole assembly 20 and an insulating film 30. The pole assembly 20 is arranged on the top wall 12 of the battery case 10 and occupies a certain space of the top wall 12. The first part 31 of the insulating film 30 covers at least a part of the side wall 11, and the second part 32 extends from the first part 31 and covers a part of the top wall 12. The overlapping part 33 formed by the second part 32 comprises at least two layers of the second part 32, and the second parts 32 are bonded and connected to each other, thereby ensuring the connection ability between the overlapping parts 33 and reducing the risk of warping of the second part 32. The peel strength between the second part 32 is s, and along the thickness direction of the battery, the width dimension of the top wall 12 is a, the width dimension of the positive projection of the part of the pole assembly 20 located outside the top wall 12 on the top wall 12 is b, and the width dimension of the second part 32 is c. When b / a≥0.5, c×s is 0.4N-8N, thereby avoiding the overlapping part 33 from warping and causing the second part 32 to warp as a whole, reducing the risk of warping of the second part 32, and ensuring that the pole assembly 20 can have a reliable current-carrying capacity, thereby improving the safe use performance of the battery pack.

[0070] In one embodiment, the battery pack is a battery module or a battery pack.

[0071] The battery module includes a plurality of batteries, and the battery module may further include an end plate and a side plate, and the end plate and the side plate are used to fix the plurality of batteries.

[0072] It should be noted that multiple batteries can be arranged in a battery box after forming a battery module, and multiple batteries can be fixed by end plates and side plates. Multiple batteries can be directly arranged in the battery box, that is, there is no need to group multiple batteries, in which case the end plates and side plates can be removed.

[0073] Those skilled in the art will readily come up with other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present utility model, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0074] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that: include: A battery housing (10), the battery housing (10) comprising a side wall (11) and a top wall (12), the side wall (11) and the top wall (12) being connected; A pole assembly (20), wherein the pole assembly (20) is arranged on the top wall (12), and at least a portion of the pole assembly (20) is located outside the top wall (12); An insulating film (30), the insulating film (30) being arranged on the outer surface of the battery housing (10), the insulating film (30) comprising a first portion (31) and a second portion (32), the first portion (31) covering at least a portion of the side wall (11), the second portion (32) extending from the first portion (31) and covering a portion of the top wall (12), the second portion (32) forming an overlapping portion (33), the overlapping portion (33) comprising at least two layers of the second portions (32), the second portions (32) being bonded to each other, and the peel strength between the second portions (32) being s; Wherein, along the thickness direction of the battery, the width dimension of the top wall (12) is a, the width dimension of the positive projection of the portion of the pole assembly (20) located outside the top wall (12) on the top wall (12) is b, the width dimension of the second portion (32) is c, and when b / a≥0.5, c×s is 0.4N-8N.

2. The battery according to claim 1, characterized in that When a≤72mm, c×s is 0.4N-4N.

3. The battery according to claim 1, characterized in that There is an arc transition between the side wall (11) and the top wall (12), the insulating film (30) covers the arc, and when the R angle of the arc is ≤3mm, c×s is 1.2N-8N.

4. The battery according to claim 1, characterized in that The Mohs hardness of the second portion (32) is 4-6, and c×s is 1.6N-4N.

5. The battery according to claim 1, characterized in that The thickness of the second portion (32) is 80 μm-200 μm, and c×s is 1.8N-4N.

6. The battery according to claim 1, characterized in that Along a direction perpendicular to the thickness direction of the battery and parallel to the top wall (12), the length of the overlapping portion (33) is d, d is 1 mm-10 mm, and c×s is 2N-4N.

7. The battery according to any one of claims 1 to 6, characterized in that c is 1mm-5mm.

8. The battery according to any one of claims 1 to 6, characterized in that s is 0.4N / mm-1.6N / mm.

9. The battery according to any one of claims 1 to 6, characterized in that The overlapping portion (33) includes three layers of the second portion (32).

10. The battery according to any one of claims 1 to 6, characterized in that The battery is a quadrangular prism-type battery, the second part (32) comprises a long side segment (321) and a short side segment (322), the long side segment (321) extends along the length direction of the battery, the short side segment (322) extends along the thickness direction of the battery, a portion of the long side segment (321) covers a portion of the short side segment (322) to form the overlapping portion (33), the long side segment (321) and the short side segment (322) are bonded and connected, and the peel strength between the long side segment (321) and the short side segment (322) is s.

11. The battery according to any one of claims 1 to 6, characterized in that The second part (32) is bonded to the top wall (12), and the peel strength between the second part (32) and the top wall (12) is greater than s.

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