Insulating film, battery, battery module, battery device and electric equipment

Abstract

The utility model relates to an insulating film, a battery, a battery module, a battery device and electric equipment, the insulating film is used for the battery, the battery comprises a shell and a battery cell, the battery cell is accommodated in the shell, the battery cell comprises a battery cell monomer and a tab, the length direction of the battery cell is a first direction, the tab is connected to the end part of the battery cell monomer in the first direction, and the insulating film is suitable for coating the battery cell. A through hole is formed in the insulating film, the minimum distance between the through hole and the end part of the battery cell monomer in the first direction is greater than or equal to a first preset distance, and the first preset distance is the minimum electrical insulating distance between the tab and the shell. The insulating film can restrain the problem of high-voltage risk after the electrolyte in the battery leaks.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to an insulating film, a battery, a battery module, a battery device and electrical equipment. Background Art

[0002] The basic structure of a soft-pack battery module is that multiple battery cells are connected in series to form a battery cell, and an insulating film is wrapped around the battery cell. The battery cell is then placed in a metal shell or insulating shell to form a battery. The insulating film is mainly used to isolate the battery cell from the metal shell to prevent short circuits or leakage. In order to fix the battery cell in the shell, structural glue is poured into the battery to bond the battery cell to the metal shell. In order to make the bonding stronger, holes are opened in the insulating film on the bottom of the battery cell to make it easier for the structural glue to enter the battery cell.

[0003] In actual use, soft-pack batteries may experience extreme situations such as overcharging, over-discharging, and low-temperature discharge. The internal gas production increases and breaks through the aluminum-plastic film seal, causing electrolyte leakage. When the electrolyte accumulates on the metal shell, multiple battery cells are short-circuited through the metal shell and the tray, which may cause thermal runaway of the battery. When thermal runaway occurs in the battery, the generated electrolyte will accumulate at the bottom of the battery module, and the structural adhesive will lose its sealing effect under the corrosion of the electrolyte. The prior art opens holes at equal distances on the bottom insulating film of the battery. Since the hole positions are not distinguished and the holes are relatively dense, when the electrolyte leaks, the exposed metal ear part of the battery's series welding is too close to the electrical insulation distance of the metal shell, which is easy to overlap and cause high-voltage arcing. That is, the existing insulating film cannot suppress the high-voltage risk after the electrolyte leaks in the battery. Utility Model Content

[0004] The utility model aims to provide an insulating film, a battery, a battery module, a battery device and an electrical equipment, so as to solve the problem that the insulating film cannot suppress the high voltage risk after the electrolyte in the battery leaks.

[0005] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides an insulating film for a battery, wherein the battery comprises a shell and a battery cell, wherein the battery cell is accommodated in the shell, wherein the battery cell comprises a battery cell unit and a pole ear, wherein the length direction of the battery cell is a first direction, and the pole ear is connected to the end of the battery cell unit in the first direction, and the insulating film is suitable for covering the battery cell, wherein the insulating film is provided with a through hole, and the minimum distance between the through hole and the end of the battery cell unit in the first direction is greater than or equal to a first preset distance, and the first preset distance is the minimum electrical insulation distance between the pole ear of the battery cell and the shell.

[0007] In one embodiment, the minimum distance between the through hole and the end of the battery cell in the first direction is less than or equal to a second preset distance, and the second preset distance is greater than the first preset distance.

[0008] In one implementation, a dimension of the through hole in the first direction is a, satisfying: 5 mm ≤ a ≤ 10 mm.

[0009] In one embodiment, the width direction of the battery cell is the second direction, the height direction of the battery cell is the third direction, the size of the battery cell in the second direction is h1, the size of the battery cell in the third direction is h2, and the size of the insulating film in the second direction after flattening is h3, satisfying: 2(h1+h2)+5mm≤h3≤2(h1+h2)+10mm.

[0010] In one embodiment, there are a plurality of battery cells, the plurality of battery cells are electrically connected in the first direction, and each of the battery cells is correspondingly provided with a group of the through holes.

[0011] In one embodiment, each group of through holes is arranged at equal intervals in the first direction and / or the second direction, and the second direction is the width direction of the battery cell.

[0012] In one implementation, the first preset distance is d1, which satisfies: 30 mm ≤ d1 ≤ 50 mm.

[0013] In a second aspect, the utility model provides a battery, comprising:

[0014] case:

[0015] A battery cell is contained in the housing, wherein the battery cell comprises a battery cell and a tab, wherein the tab is connected to an end of the battery cell in the first direction;

[0016] Structural adhesives;

[0017] The insulating film described in any one of the various embodiments of the first aspect, the insulating film covers the battery cell, the structural adhesive bonds the battery cell and the shell through the through hole, the minimum distance between the through hole opened by the insulating film and the end of the battery cell in the first direction is greater than or equal to a first preset distance, and the first preset distance is the minimum electrical insulation distance between the tab and the shell.

[0018] In one embodiment, there are a plurality of battery cells, and the plurality of battery cells are spaced apart in a second direction, and the through hole corresponds to at least a partial gap between two adjacent battery cells in the second direction, and the second direction is a width direction of the battery cells.

[0019] In one embodiment, the battery further includes a spacer and a circuit board, the spacer includes a bracket and a connecting piece, the bracket is arranged at the end of the battery cell in the first direction, the bracket clamps the pole ear, the connecting piece is arranged on the bracket, the connecting piece is connected to the pole ear, and the circuit board is connected to the connecting piece.

[0020] In one embodiment, the shell is provided with a grouting hole, and the grouting hole is arranged corresponding to the through hole.

[0021] In one embodiment, the shell includes a first plate and a second plate arranged opposite to each other, the space between the first plate and the second plate is a receiving space, and the shell also includes a partition, which divides the receiving space into a plurality of sub-spaces, and each of the sub-spaces receives the battery cell.

[0022] In one embodiment, the first plate, the second plate and the partition are an integrated structure.

[0023] In a third aspect, the utility model provides a battery module, comprising a housing and a battery as described in any one of the various embodiments of the second aspect, wherein the battery is accommodated in the housing.

[0024] In a fourth aspect, the utility model provides a battery device, comprising a battery as described in any one of the various embodiments of the second aspect or a battery module as described in any one of the various embodiments of the third aspect.

[0025] In a fifth aspect, the utility model provides an electrical equipment, including an electrical device and a battery device as described in any one of the various embodiments of the fourth aspect, wherein the battery device is used to supply power to the electrical device.

[0026] The utility model arranges an insulating film to cover the battery cell, and the pole ear of the battery cell is located at the end of the battery cell in the length direction of the battery cell, and the minimum distance between the through hole on the insulating film and the end of the battery cell monomer in the length direction of the battery cell is greater than or equal to a first preset distance, wherein the first preset distance is the minimum electrical insulation distance between the pole ear and the battery shell, so that the position of the through hole avoids the position of the pole ear of the battery cell, increases the electrical insulation distance between the pole ear and the metal shell, and reduces the risk of high-voltage arcing caused by thermal failure after electrolyte leakage in the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a perspective view of a battery of an embodiment;

[0029] Figure 2 is an exploded view of a partial structure of a battery according to an embodiment;

[0030] Figure 3 is a perspective view of a partial structure of a battery according to an embodiment;

[0031] Figure 4 The exploded view of another part of the structure of a battery according to an embodiment.

[0032] Description of reference numerals:

[0033] 100-battery, 10-insulating film, 11-through hole, 20-battery cell, 211-battery cell monomer, 212-ear, 22-first top surface, 23-second top surface, 30-spacer, 31-bracket, 32-connecting piece, 40-circuit board, 50-housing, 51-first plate, 52-second plate, 53-partition, 54-subspace, 60-grouting hole, X-first direction, Y-second direction, Z-third direction. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0036] Unless otherwise defined, all technical and scientific terms used in this utility model have the same meaning as those commonly understood by technicians in the technical field of this utility model. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more related listed items.

[0037] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0038] For reference Figure 1 The utility model provides a battery module, including a shell and a battery 100, wherein the battery 100 is accommodated in the shell.

[0039] The shell mainly protects the battery module, prevents external impact, and prevents dust and water. The shell is usually made of metal or plastic materials, and the metal materials include aluminum alloy, stainless steel, etc., without limitation.

[0040] For reference Figure 1 , Figure 2 and Figure 3 The utility model provides a battery 100, comprising a shell 50, a battery cell 20, a structural adhesive and an insulating film 10. The battery cell 20 is accommodated in the shell 50. The insulating film 10 covers the battery cell 20, and the structural adhesive adheres the battery cell 20 and the shell 50 through the through hole 11.

[0041] The length direction of the battery cell 20 is the first direction X, the width direction of the battery cell 20 is the second direction Y, and the height direction of the battery cell 20 is the third direction Z.

[0042] The battery 100 of the present invention is a soft pack battery 100, so the shell 50 is made of metal material, specifically, the shell 50 is an aluminum plastic film, and the corresponding battery 100 is a soft pack battery. The shell 50 is provided with a connection hole, and there can be multiple connection holes, which are arranged at intervals on the shell 50.

[0043] For reference Figure 2 The battery cell 20 includes a battery cell 211 and a tab 212, and the tab 212 is connected to the end of the battery cell 211 in the first direction X. A plurality of battery cells 20 are arranged at intervals in the second direction Y. The battery cell 20 also includes an aluminum-plastic film, and the tab 212 is connected and fixed to the positive and negative electrodes of the battery cell 211, and the connection method can be welding, crimping, screwing, etc., without limitation. The type of the tab 212 can be a single-pole tab, a bipolar tab, a full-pole tab, etc., without limitation. The aluminum-plastic film is suitable for coating the battery cell 211, which can reduce the weight of the battery cell 211 and realize the lightweight of the battery 100. The battery cell 211 also includes an electrolyte, and the aluminum-plastic film is also used to contain the electrolyte. The battery cell 211 can be square or blade-shaped, which is convenient for the integration of the battery cell 20.

[0044] When there are multiple battery cells 20, the multiple battery cells 20 are connected in series, and the arrangement of the battery cells 20 can be M-shaped or U-shaped, generally 8S (i.e., 8 battery cells 20 connected in series) or 12S (i.e., 12 battery cells 20 connected in series), and the total positive and negative leads of the battery cells 20 are connected at the same end. The M-shaped arrangement can more effectively utilize space and improve the overall energy density of the battery 100; the U-shaped arrangement can improve the stability and safety of the battery 100.

[0045] For reference Figure 2In one embodiment, the battery 100 further includes a spacer 30, and the battery further includes a spacer 30 and a circuit board 40. The spacer 30 includes a bracket 31 and a connecting piece 32. The bracket 31 is arranged at the end of the battery cell 20 in the first direction X. The bracket 31 clamps the pole ear 212. The connecting piece 32 is arranged on the bracket 31. The connecting piece 32 is connected to the pole ear 212, and the circuit board 40 is connected to the connecting piece 32. The spacer 30 is arranged at the end of the battery 100, and can also connect two adjacent battery cells 20. The number of the bracket 31 and the connecting piece 32 can be multiple, and the connecting piece 32 is connected and fixed to the bracket 31. The connecting piece 32 can be an aluminum sheet, a copper sheet, etc., without limitation. The connecting piece 32 is used to provide a medium for connecting adjacent battery cells 20 in series, provide additional structural support and a current transmission path, and the pole ear 212 of the battery cell 20 is connected and fixed to the connecting piece 32 to realize the series connection of the battery cells 20. The connection method can be welding, crimping, etc., without limitation. After the connection is completed, the tabs 212 and the connecting pieces 32 are both exposed metal. The bracket 31 is an insulating bracket 31, and the specific material can be polypropylene (PP), polyethylene (PE), etc. The bracket 31 is used to limit the position of the battery cell 20, control the distance between the battery cells 20, and support the structure of the battery cell 20.

[0046] The insulating film 10 covering the battery cell 20 can isolate the distance between the different positive and negative electrodes of the battery 100 to prevent a short circuit inside the battery 100. On the other hand, the insulating film 10 can prevent foreign objects from colliding with the battery 100 and causing damage to the battery 100.

[0047] The type of structural adhesive can be polyurethane, polyimide, silicone rubber, etc., without limitation. After the battery 100 is assembled, the structural adhesive is injected into the interior from the connection hole on the shell 50. The structural adhesive is used to bond the battery cell 20 and the metal shell to improve the structural stability of the battery 100. Therefore, it is necessary to open a hole in the insulating film 10 so that the structural adhesive can directly contact the battery cell 20 to facilitate the potting of the structural adhesive.

[0048] For reference Figure 2 and Figure 4 In one embodiment, the battery 100 further includes a circuit board 40. The circuit board 40 may be a flexible printed circuit board 40 (FDC). The FDC is mainly composed of a flexible insulating substrate and a conductive circuit. The flexible material may be polyimide (PI), polyester film (PET), etc. The conductive circuit may be made of a metal foil (such as copper foil, aluminum foil, etc.) or conductive ink, and a circuit pattern is formed on the flexible substrate by printing, etching, and other processes. The circuit board 40 is connected to the connecting piece 32 of the spacer 30, and the connection method may be pin welding. The circuit board 40 is used to collect voltage data of the battery 100. The battery cell 20 has a first top surface 22 and a second top surface 23 that are relatively arranged in the third direction Z, and the circuit board 40 is in close contact with the first top surface 22.

[0049] For reference Figure 1In one embodiment, the housing 50 is provided with a grouting hole 60, and the grouting hole 60 is arranged corresponding to the through hole 11 on the insulating film 10. There can be multiple grouting holes 60, which are arranged at intervals on the housing 50. The shape of the grouting hole 60 can be circular, elliptical, rectangular, etc., without limitation. Optionally, the grouting hole 60 is circular, and the diameter of the grouting hole 60 is 5 mm.

[0050] The grouting holes 60 are provided to provide a channel for injecting structural adhesive into the interior of the shell 50 .

[0051] For reference Figure 1 In one embodiment, the shell 50 includes a first plate 51 and a second plate 52 that are arranged opposite to each other, and the space between the first plate 51 and the second plate 52 is a receiving space. The shell 50 also includes a partition 53, and the partition 53 divides the receiving space into a plurality of sub-spaces 54, and each sub-space 54 receives a battery cell 20.

[0052] The number of battery cells 20 housed in each subspace 54 may be one or more, without limitation.

[0053] Optionally, the grouting holes 60 are opened on the first plate 51 .

[0054] The first plate 51, the second plate 52 and the partition plate 53 can be aluminum plates, steel plates, etc., without limitation. There can be multiple partition plates 53, and the partition plates 53 can be connected to the first plate 51 and the second plate 52 by welding, clamping, bonding, etc., without limitation.

[0055] The first plate 51 , the second plate 52 and the partition plate 53 may form a harmonica-shaped tray, which provides an assembly space for the battery cells 20 and also provides structural support for the battery device.

[0056] In one embodiment, the first plate 51, the second plate 52 and the partition 53 are an integrated structure. That is, the first plate 51, the second plate 52 and the partition 53 are an integrated structure prepared by an integrated process, and the integrated process can be stamping, casting, etc., without limitation. The housing 50 of the integrated structure is convenient for assembling the battery device.

[0057] The utility model provides a battery device, including a battery 100 or a battery module. There are multiple batteries 100 or battery modules.

[0058] When there are multiple battery modules, the battery device also includes a connecting bar, which connects adjacent battery modules to achieve electrical connection of the battery modules. The connecting bar can be a copper bar, an aluminum bar, a nickel strip connecting bar, etc., without limitation.

[0059] Optionally, the battery device further comprises a tray, and the battery 100 or the battery module is placed on the tray. Optionally, the first plate 51 and the second plate 52 of the battery 100 can serve as the tray, and no tray is required.

[0060] The tray is used to support and fix the battery 100 or battery module. The tray is usually made of metal or plastic materials, among which metal materials such as aluminum alloy and stainless steel have high strength and corrosion resistance, and are suitable for battery 100 systems under high load and harsh environment. Plastic materials such as nylon, polycarbonate, fiberglass, etc. have light weight and good insulation performance, and are suitable for some application scenarios with high weight and cost requirements.

[0061] In actual use of the battery 100, extreme situations such as overcharge, over discharge, and low-temperature discharge may occur. The internal gas production increases and breaks through the aluminum-plastic film seal, causing electrolyte leakage. When the electrolyte gathers on the shell 50 of the battery 100, multiple battery cells 20 are short-circuited with the tray through the shell 50, which may cause thermal runaway of the battery 100. In addition, when thermal runaway occurs in the battery 100 package, the generated electrolyte will gather at the bottom of the height direction of the battery cell 20, and the structural glue will lose its sealing effect under the corrosion of the electrolyte. The electrolyte will overlap the series position of the battery cell 20 with the metal shell 50 through the opening of the insulating film 10, resulting in high-voltage arc failure in the battery 100, causing the insulation of the battery 100 to be broken down.

[0062] For reference Figure 2 and Figure 3 The utility model provides an insulating film 10 for a battery. The battery 100 includes a shell 50 and a battery cell 20. The length direction of the battery cell 20 is a first direction X. The insulating film 10 is suitable for covering the battery cell 20. The insulating film 10 is provided with a through hole 11. The minimum distance between the through hole 11 and the battery cell 211 in the first direction X is greater than or equal to a first preset distance. The first preset distance is the minimum electrical insulation distance between the tab 212 of the battery cell 20 and the shell 50.

[0063] The material of the insulating film 10 can be polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), Mylar film, etc. Among them, the Mylar film has a higher hardness, a regular shape and is not easy to wrinkle, while the PET film is softer and has a better adhesion effect, and is suitable for a more compact space.

[0064] In one embodiment, the first preset distance is d1, which satisfies: 30mm≤d1≤50mm. Optionally, the first preset distance may be 30mm, 35mm, 40mm, 50mm, etc., without limitation. The first preset distance is the minimum electrical insulation distance between the tab 212 of the battery cell 20 and the shell 50. The minimum electrical insulation distances of battery cells 20 of different sizes are different. The first preset distance can be obtained by testing according to the size of the battery cell 20. A through hole 11 is set on the insulating film 10 according to the first preset distance. The minimum distance between the through hole 11 and the battery cell 211 in the first direction X is greater than or equal to the first preset distance, which increases the electrical insulation distance between the tab 212 and the metal shell 50 and reduces the risk of high-voltage arcing after thermal failure of the battery 100.

[0065] For reference Figure 2 and Figure 4 Optionally, the through hole 11 and the second top surface 23 of the battery cell 20 should be arranged to prevent the structural adhesive from contacting the circuit board 40 and affecting the operation of the circuit board 40. At the same time, the through hole 11 and the second top surface 23 of the battery cell 20 are arranged correspondingly, which can facilitate the structural adhesive to enter the gap between the battery cell monomers 211 and strengthen the contact area between the structural adhesive and the battery cell 20. If the through hole 11 and the side surface of the battery cell 20 in the second direction Y are arranged correspondingly, the structural adhesive only adheres to the position on the side surface of the battery cell 20 corresponding to the through hole 11, so that the contact area between the structural adhesive and the battery cell 20 is reduced.

[0066] The insulating film 10 of the utility model covers the battery cell 20, wherein the pole ear 212 of the battery cell 20 is located at the end of the battery cell 20 in the first direction X, and the minimum distance between the through hole 11 on the insulating film 10 and the end of the battery cell 20 in the first direction X is greater than or equal to the first preset distance, so that the position of the through hole 11 avoids the position of the pole ear 212 of the battery cell 20, increases the electrical insulation distance between the pole ear 212 and the metal shell 50, and reduces the risk of high-voltage arcing after thermal failure of the battery 100.

[0067] In one embodiment, the minimum distance between the through hole 11 and the battery cell 211 in the first direction X is less than or equal to the second preset distance, and the second preset distance is greater than the first preset distance.

[0068] The second preset distance can be 50mm, 45mm, 40mm, etc., without limitation. Optionally, the first preset distance is 30mm, the second preset distance is 50mm, the minimum distance between the through hole 11 and the battery cell 20 in the first direction X is d, and satisfies: 30mm≤d≤50mm, and d can be 30mm, 35mm, 40mm, 45mm, 50mm, etc., without limitation.

[0069] The minimum distance between the through hole 11 and the end of the battery cell 20 in the first direction X is greater than the second preset distance, which will result in a reduction in the portion of the battery cell 20 that can be bonded with the structural adhesive, and will affect the bonding strength of the structural adhesive; the minimum distance between the through hole 11 and the battery cell 20 group in the first direction X is less than or equal to the second preset distance, which can ensure that the portion of the battery cell 20 in contact with the structural adhesive accounts for a proportion of the battery cell 20, so that the structural adhesive can effectively bond the battery cell 20 and the shell 50, which is beneficial to improving the structural stability of the battery 100.

[0070] In one implementation, the dimension of the through hole 11 in the first direction X is a, which satisfies: 5 mm ≤ a ≤ 10 mm.

[0071] a can be 5 mm, 6 mm, 8 mm, 10 mm, etc., without limitation. The through hole 11 can be circular, elliptical, rectangular, etc., without limitation.

[0072] When a<5mm, the size of the through hole 11 is too small, and the corresponding contact area between the structural adhesive and the battery cell 20 is small, which makes the bonding strength of the structural adhesive to the battery cell 20 and the shell 50 small, which is not conducive to the structural strength of the battery cell 20; when a>10mm, the size of the through hole 11 is too small, and the protective effect of the insulating film 10 itself on the battery cell 20 is reduced; when 5mm≤a≤10mm, the size of the through hole 11 can take into account both the connection strength of the structural adhesive to the battery cell 20 and the shell 50 and the protective strength of the insulating film 10 to the battery cell 20.

[0073] In one embodiment, the size of the battery cell 20 in the second direction Y is h1, the size of the battery cell 20 in the third direction Z is h2, and the size of the insulating film 10 in the second direction Y after being flattened is h3, satisfying: 2(h1+h2)+5mm≤h3≤2(h1+h2)+10mm. The flattening of the insulating film 10 means that the insulating film 10 has not yet covered the battery cell 20. It can be considered that the insulating film 10 extends in the first direction X and the second direction Y when unfolded, the first direction X is the length direction of the insulating film 10, and the second direction Y is the width direction of the insulating film 10.

[0074] In one embodiment, the length of the insulating film 10 in the first direction X is consistent with the length of the battery 100 in the first direction X, wherein the length of the battery 100 in the first direction X includes the length of the battery cell 20 in the first direction X and the length of the spacer 30 in the first direction X. Optionally, the length of the insulating film 10 in the first direction X may be 1600 mm, 1650 mm, 1700 mm, etc., without limitation.

[0075] h1 can be 45mm, 48mm, 50mm, 52mm, etc., and h2 can be 85mm, 88mm, 90mm, 92mm, etc., without limitation. Optionally, h1 is 50mm, h2 is 90mm, and 285mm≤h3≤290mm is met, and h3 can be 285mm, 286mm, 288mm, 290mm.

[0076] In one embodiment, the through hole 11 is disposed in the middle region of the insulating film 10 in the second direction Y after being flattened, and after the insulating film 10 covers the battery 100 , the through hole 11 is correspondingly disposed on the second top surface 23 of the battery cell 20 .

[0077] When 2(h1+h2)+5mm≤h3≤2(h1+h2)+10mm, there can be some surplus when the insulating film 10 covers the battery 100, which is convenient for pressing and sticking the insulating film 10, and can ensure that the insulating film 10 is not excessive and causes waste.

[0078] For reference Figure 2 and Figure 4 In one embodiment, there are multiple battery cells 20, and the multiple battery cells 20 are electrically connected in the first direction X, and each battery cell 20 is correspondingly provided with a group of through holes 11.

[0079] Each group of through holes 11 may include a plurality of through holes 11 , and the plurality of through holes 11 are arranged at intervals on the insulating film 10 .

[0080] The multiple battery cells 20 are connected in series in the first direction X through the spacer 30 , and each battery cell 20 is correspondingly provided with a through hole 11 , so that the structural adhesive can bond each battery cell 20 and the shell 50 , which is beneficial to improving the structural stability of the battery 100 .

[0081] In one embodiment, each group of through holes 11 is arranged at equal intervals in the first direction X and / or the second direction Y.

[0082] The distance between two adjacent through holes 11 in the first direction X is d2, and d2 can be 15 mm, 18 mm, 20 mm, 22 mm, etc.

[0083] The distance between two adjacent through holes 11 in the second direction Y is d3, and d3 can be 12 mm, 12.5 mm, 13 mm, 13.5 mm, etc.

[0084] The through holes 11 arranged at equal intervals in the first direction X and / or the second direction Y, that is, the multiple through holes 11 in each group of through holes 11 are arranged in an array. On the one hand, it is convenient to perform the punching operation on the insulating film 10, and on the other hand, the bonding strength between the battery cell 20 and the shell 50 is evenly distributed, which is beneficial to improving the structural strength of the battery 100.

[0085] For reference Figure 2 In one embodiment, the battery cell 20 includes a plurality of battery cell monomers 211 , the plurality of battery cell monomers 211 are spaced apart in the second direction Y, and the through hole 11 is correspondingly arranged in at least a portion of the gap between two adjacent battery cell monomers 211 in the second direction Y.

[0086] The multiple battery cells 211 are spaced apart in the second direction Y, and the battery cells 211 are limited in the second direction Y by the bracket 31 of the spacer 30 , and the tabs 212 are welded to the connecting pieces 32 on the bracket 31 , so that the multiple battery cells 20 are integrated into the battery 100 .

[0087] The cell monomers 211 are arranged in m rows, i.e., the cell monomers 211 form (m-1) slits, where m≥2 and is a positive integer. The number of rows of the through holes 11 in the second direction Y is less than or equal to (m-1), i.e., a through hole 11 is arranged correspondingly on each slit, and there are also some gaps where no through hole 11 is arranged correspondingly.

[0088] The through holes 11 are arranged corresponding to at least part of the gap positions of the battery cells 211 in the second direction Y, so that the structural adhesive can fill the gaps between adjacent battery cells 211 through the through holes 11, thereby increasing the contact area between the structural adhesive and the battery cell 20 and enhancing the structural strength of the battery 100.

[0089] The utility model provides an electric device, comprising an electric device and a battery device as described in any one of the above embodiments, wherein the battery device is used to supply power to the electric device.

[0090] Electrical equipment may include washing machines, televisions, etc., and electrical devices may include distribution boxes, transformers, light bulbs, etc., without restriction.

[0091] The technical solution of the utility model is described in detail below through specific embodiments.

[0092] The first preset distance is 30 mm.

[0093] Example 1

[0094] The battery 100 covered with the insulating film 10 of the present invention is provided, that is, the minimum distance between the through hole 11 on the insulating film 10 of the battery cell 20 and the end of the battery cell 20 in the first direction X is 30 mm.

[0095] Comparative Example 1

[0096] A battery 100 covered with an insulating film 10 having through holes 11 at equal intervals is provided, i.e., the through holes 11 on the insulating film 10 are arranged at equal intervals and densely, wherein the minimum distance between the through holes 11 and the end of the battery cell 211 in the first direction X is 5 mm, which is less than the first preset distance.

[0097] The experimental steps are as follows: using a ceramic needle to pierce a 1 mm hole at the end of the battery cell 20 in the battery 100 (the end of the battery cell 20 refers to the end close to another battery cell 20), and the battery 100 is placed on a metal tray; using the insulating film 10 provided in Example 1 and Comparative Example 1 to cover the battery 100, respectively, and pouring structural glue at the bottom of the battery cell 20; injecting 10 ml of electrolyte at the connection between two adjacent battery cells 20 to ensure that the electrolyte overlaps the shell 50 and the tray of the battery 100; connecting 600 V high voltage in series between the battery cells 20, with a current limiting of 60 A, to observe whether arcing and fire occur, and whether the loop current increases, so as to determine whether the insulation of the battery 100 is broken down.

[0098] The observation results are as follows: after the high voltage was applied for 4 hours, the battery 100 of Example 1 had no arcing and fire, indicating that the battery 100 had no insulation breakdown; after the high voltage was applied for 1 hour, the battery 100 of Comparative Example 1 had arcing and fire, indicating that the insulation of the battery 100 was broken down.

[0099] Therefore, the insulating film 10 of the present invention is used to wrap the battery cell 20, wherein the end of the battery cell 20 is the joint where the battery cells 20 are connected in series, and the pole ear 212 of the battery cell 20 is located at the end of the battery cell 20, and the minimum distance between the through hole 11 on the insulating film 10 and the battery cell 211 in the length direction of the battery cell 20 is greater than or equal to the first preset distance, so that the position of the through hole 11 avoids the position of the pole ear 212 of the battery cell 20, increases the electrical insulation distance between the pole ear 212 and the metal shell, and reduces the risk of high-voltage arcing after thermal failure of the battery 100.

[0100] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0101] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An insulating film for a battery, characterized in that: The battery includes a shell and a battery cell, the battery cell is accommodated in the shell, the battery cell includes a battery cell and a pole ear, the length direction of the battery cell is a first direction, the pole ear is connected to the end of the battery cell in the first direction, the insulating film is suitable for covering the battery cell, the insulating film is provided with a through hole, the minimum distance between the through hole and the end of the battery cell in the first direction is greater than or equal to a first preset distance, and the first preset distance is the minimum electrical insulation distance between the pole ear and the shell.

2. The insulating film according to claim 1, wherein The minimum distance between the through hole and the end of the battery cell in the first direction is less than or equal to a second preset distance, and the second preset distance is greater than the first preset distance.

3. The insulating film according to claim 1, wherein The dimension of the through hole in the first direction is a, which satisfies: 5mm≤a≤10mm.

4. The insulating film according to claim 1, wherein The width direction of the battery cell is the second direction, the height direction of the battery cell is the third direction, the size of the battery cell in the second direction is h1, the size of the battery cell in the third direction is h2, and the size of the insulating film in the second direction after being flattened is h3, satisfying: 2(h1+h2)+5mm≤h3≤2(h1+h2)+10mm.

5. The insulating film according to claim 1, wherein There are a plurality of the battery cells, the plurality of the battery cells are electrically connected in the first direction, and each of the battery cells is correspondingly provided with a group of the through holes.

6. The insulating film according to claim 5, characterized in that Each group of through holes is arranged at equal intervals in the first direction and / or the second direction, and the second direction is the width direction of the battery cell.

7. The insulating film according to any one of claims 1 to 6, characterized in that: The first preset distance is d1, which satisfies: 30mm≤d1≤50mm.

8. A battery, characterized in that: include: case: A battery cell is contained in the housing, wherein the battery cell comprises a battery cell and a tab, wherein the tab is connected to an end of the battery cell in the first direction; Structural adhesives; The insulating film as described in any one of claims 1 to 7, wherein the insulating film covers the battery cell, the structural adhesive bonds the battery cell and the shell through the through hole, and the minimum distance between the through hole opened by the insulating film and the end of the battery cell in the first direction is greater than or equal to a first preset distance, and the first preset distance is the minimum electrical insulation distance between the tab and the shell.

9. The battery according to claim 8, characterized in that There are a plurality of battery cells, and the plurality of battery cells are spaced apart in a second direction. The through hole corresponds to at least a partial gap between two adjacent battery cells in the second direction, and the second direction is a width direction of the battery cells.

10. The battery according to claim 8, characterized in that The battery also includes a spacer and a circuit board, the spacer includes a bracket and a connecting piece, the bracket is arranged at the end of the battery cell in the first direction, the bracket clamps the pole ear, the connecting piece is arranged on the bracket, the connecting piece is connected to the pole ear, and the circuit board is connected to the connecting piece.

11. The battery according to claim 8, characterized in that The shell is provided with a grouting hole, and the grouting hole is arranged corresponding to the through hole.

12. The battery according to claim 8, characterized in that The shell includes a first plate and a second plate that are arranged opposite to each other, the space between the first plate and the second plate is a receiving space, and the shell also includes a partition that divides the receiving space into a plurality of sub-spaces, each of which receives the battery cell.

13. The battery according to claim 12, characterized in that The first plate, the second plate and the partition are an integrated structure.

14. A battery module, characterized in that: The invention comprises a housing and a battery as claimed in any one of claims 8 to 13, wherein the battery is accommodated in the housing.

15. A battery device, characterized in that: Comprising the battery according to any one of claims 8 to 13 or the battery module according to claim 14.

16. An electrical equipment, characterized in that: It comprises an electric device and the battery device as claimed in claim 15, wherein the battery device is used to supply power to the electric device.

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