Battery monomer and its bloating repair method, battery device and power-using device

Abstract

The present application discloses a battery cell and a method for repairing its bloating, a battery device and an electrical device. The battery cell includes a shell, an electrode assembly and an end cap assembly. The shell has an opening. The electrode assembly is arranged inside the shell. The end cap assembly is covered at the opening. The end cap assembly includes an end cap and an insulating member. The insulating member is arranged on the side of the end cap facing the electrode assembly. The insulating member protrudes toward one side of the electrode assembly to form a ridge. The repair method includes the following steps: drilling a hole into the end cap of the battery cell to form a through hole; exhausting the inside of the shell; injecting glue into the ridge; waiting for the glue to solidify to form a sealing portion; using a sealing member to seal the through hole; wherein, in the height direction of the battery cell, the orthographic projection of the through hole is within the range of the orthographic projection of the ridge. The present application reduces the risk of short circuit in the battery cell and improves the reliability of the battery cell.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell and a method for repairing its bloating, a battery device, and an electrical device. Background Art

[0002] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0003] In the development of battery technology, how to improve the reliability of battery cells is a research direction in battery technology. Summary of the invention

[0004] The embodiments of the present application provide a battery cell and a method for repairing the flatulence thereof, a battery device and an electrical device, which can improve the reliability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a method for repairing bloating of a battery cell, wherein the battery cell comprises a shell, an electrode assembly and an end cap assembly, wherein the shell has an opening, the electrode assembly is arranged inside the shell, the end cap assembly is covered at the opening, the end cap assembly comprises an end cap and an insulating member, the insulating member is arranged on a side of the end cap facing the electrode assembly, the insulating member protrudes toward one side of the electrode assembly to form a bulge, and the repair method comprises the following steps:

[0006] Drilling holes into the end caps of the battery cells to form through holes;

[0007] Exhaust the inside of the shell;

[0008] injecting glue into the raised portion;

[0009] Wait for the glue to solidify and form a sealing part;

[0010] Using seals to block through holes;

[0011] In the height direction of the battery cell, the orthographic projection of the through hole is located within the range of the orthographic projection of the raised portion.

[0012] In the above scheme, since the position of the through hole corresponds to the raised part, when drilling a hole in the end cover, the metal chips generated will only fall into the raised part, reducing the probability of the metal chips falling into the shell and contacting the electrode assembly, thereby reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell. After the metal chips generated by drilling fall into the raised part, glue is injected into the raised part to form a sealing part, which seals the metal chips and prevents the metal chips from moving from the gap between the end cover and the insulating member to the inside of the shell to a certain extent, further reducing the risk of short circuit.

[0013] In some embodiments, along the width direction of the battery cell, the raised portion includes a plurality of sub-grooves arranged in sequence, and adjacent sub-grooves are separated by reinforcing ribs; along the height direction, the orthographic projection of the through hole does not overlap with the orthographic projection of the reinforcing rib.

[0014] In the above scheme, the damage of the reinforcing ribs during drilling can be avoided to a certain extent, thereby ensuring the overall strength of the end cover.

[0015] In some embodiments, the end cover includes two first sides arranged opposite to each other along the width direction, and two second sides arranged opposite to each other along the length direction of the battery cell, the first side is connected to the second side, and the length of the first side is greater than the length of the second side; the through hole is arranged near the first side.

[0016] In the above solution, the risk of damaging the reinforcing ribs during drilling can be further reduced.

[0017] In some embodiments, before the step of exhausting the interior of the housing, the step further includes:

[0018] A waterproof membrane is attached to the through hole of the end cover.

[0019] In the above scheme, by pasting a waterproof film after drilling, moisture can be prevented from entering the interior of the battery cell through the through hole to a certain extent, further improving the reliability of the battery cell.

[0020] In some embodiments, along the width direction of the battery cell, the raised portion includes a plurality of sub-grooves arranged sequentially; along the height direction, the orthographic projection of the through hole is located within the range of the orthographic projection of one of the sub-grooves, and the sealing portion is located in the sub-groove.

[0021] In the above solution, the cost of glue injection can be reduced by injecting glue only in the sub-grooves corresponding to the through holes.

[0022] In some embodiments, the material of the glue includes polyurethane hot melt adhesive, which does not react with the electrolyte, is resistant to high temperature and high pressure, and can be cured quickly.

[0023] In some embodiments, after the step of sealing the through hole with a sealant, the step further includes: sticking a sealant on the through hole of the end cover.

[0024] In the above solution, the sealant enhances the sealing effect at the through hole.

[0025] In some embodiments, the sealant covers the seal to further enhance the sealing effect.

[0026] In a second aspect, an embodiment of the present application further provides a battery cell prepared according to the above-mentioned repair method.

[0027] In some embodiments, the distance between the through hole and the edge of the end cap is L, the through hole is circular, the diameter of the through hole is D, and L and D satisfy: 1≤L / D≤14.

[0028] In the above scheme, the ridge is generally located at the edge of the end cap, and the distance between the through hole and the edge of the end cap is within a suitable range, so that the orthographic projection of the through hole is within the range of the orthographic projection of the ridge in the height direction of the battery cell. At the same time, the diameter of the through hole is within a suitable range, which not only ensures the exhaust speed to a certain extent, but also reduces the risk of external moisture entering the battery cell.

[0029] In some embodiments, L and D satisfy: 2.5≤L / D≤10.

[0030] In the above solution, it is further ensured that the orthographic projection of the through hole can be located within the range of the orthographic projection of the raised portion, further reducing the risk of external moisture entering the interior of the battery cell.

[0031] In a third aspect, an embodiment of the present application further provides a battery device, comprising the above-mentioned battery cell.

[0032] In a fourth aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery device, and the battery device is used to provide electrical energy.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0036] Figure 2 An exploded view of a battery device according to some embodiments of the present application;

[0037] Figure 3 A schematic diagram of the structure of a battery module according to some embodiments of the present application;

[0038] Figure 4 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0039] Figure 5 It is a schematic flow chart of a method for repairing battery monomer bloating in some embodiments of the present application;

[0040] Figure 6 is an exploded schematic diagram of an end cap assembly of some embodiments of the present application;

[0041] Figure 7 is a partial schematic diagram of the end caps of some other embodiments of the present application;

[0042] Figure 8 is a schematic diagram of the structure of the end caps of some embodiments of the present application;

[0043] Fig. 9 is a partial schematic diagram of an end cap of some embodiments of the present application;

[0044] Fig.10 It is a schematic diagram of the structure of the end caps of other embodiments of the present application;

[0045] Fig.11 is a schematic flow chart of a method for repairing battery monomer bloating in other embodiments of the present application;

[0046] Fig.12 is a partial schematic diagram of the end caps of other embodiments of the present application;

[0047] Fig.13 is a schematic flow chart of a method for repairing battery monomer bloating in some other embodiments of the present application;

[0048] Fig.14 yes Fig.10 A magnified schematic diagram of point A;

[0049] Fig.15 yes Fig.10 An enlarged schematic diagram of the through hole diameter marked at A.

[0050] Description of reference numerals:

[0051] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, upper cover; 30, housing; 400, battery module; 20, battery cell; 22, housing; 21, end cover assembly; 23, electrode assembly; 26, electrode terminal; 40, end cover; 41, through hole; 42, first side; 43, second side; 50, insulating member; 51, raised portion; 512, sub-groove; 513, reinforcing rib; 60, sealing member; 70, waterproof membrane; 80, sealing portion; X, length direction; Y, width direction; Z, height direction. DETAILED DESCRIPTION

[0052] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0053] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0054] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0055] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0056] In the present application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells or magnesium-ion battery cells, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0057] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0058] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0059] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0060] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0061] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0062] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0063] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0064] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0065] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0066] Please refer to Figure 2 , Figure 2 An exploded view of a device provided in some embodiments of the present application. The battery device 100 includes a battery case and a battery cell 20. In some embodiments, the battery case may include an upper cover 10 and a case 30, the upper cover 10 and the case 30 cover each other, and the upper cover 10 and the case 30 jointly define a receiving cavity for accommodating the battery cell 20. The case 30 may be a hollow structure with one end open, the upper cover 10 may be a plate-like structure, the upper cover 10 covers the open side of the case 30, so that the upper cover 10 and the case 30 jointly define a receiving cavity; the upper cover 10 and the case 30 may also be hollow structures with one side open, and the open side of the upper cover 10 covers the open side of the case 30. Of course, the battery case formed by the upper cover 10 and the case 30 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0067] Figure 3 This is a schematic diagram of the structure of the battery module of some embodiments of the present application. In the battery device 100, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box; of course, the battery device 100 can also be a battery module 400 in the form of multiple battery cells 20 first connected in series, in parallel, or in mixed connection, and the multiple battery modules 400 are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0068] Each battery cell 20 may be a secondary battery cell or a primary battery cell, or a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0069] Please refer to Figure 4 , Figure 4 Schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application. A battery cell 20 refers to the smallest unit constituting a battery. The battery cell 20 includes an end cap assembly 21, a housing 22, an electrode assembly 23 and other functional components.

[0070] The end cap assembly 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap assembly 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap assembly 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap assembly 21 is not easy to deform when it is squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 26 can be provided on the end cap assembly 21. The electrode terminal 26 can be used to electrically connect with the electrode assembly 23 to output or input the electrical energy of the battery cell 20. In some embodiments, the end cap assembly 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap assembly 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap assembly 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap assembly 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0071] Battery cells will decay over time, and the gas generated inside the battery cells after decay will cause the shell to swell. In order to repair the performance of these degraded batteries and reuse them for a second time and give full play to the value of the battery cells, holes are usually drilled on the battery cells to exhaust gas. However, the metal chips generated during the drilling process can easily fall into the shell, and short-circuit after contacting the electrode assembly, reducing the reliability of the battery cells.

[0072] In order to solve the above technical problems, an embodiment of the present application provides a method for repairing battery cell bloating, wherein the battery cell includes a shell, an electrode assembly and an end cover assembly, the electrode assembly is arranged inside the shell, the end cover assembly is covered at the opening, the end cover assembly includes an end cover and an insulating member, the insulating member is arranged on the side of the end cover facing the electrode assembly, and the insulating member protrudes toward the side of the electrode assembly to form a bulge, and the repair method includes the following steps: drilling a hole in the end cover of the battery cell to form a through hole; venting the inside of the shell; and sealing the through hole with a sealing member; wherein, in the height direction along the battery cell, the orthographic projection of the through hole is within the range of the orthographic projection of the bulge.

[0073] In the above scheme, since the position of the through hole corresponds to the raised portion, when drilling a hole on the end cover, the metal chips generated will only fall into the raised portion, reducing the probability of metal chips falling into the shell and contacting the electrode assembly, thereby reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell.

[0074] Figure 5 1 is a flow chart of a method for repairing battery monomer bloating in some embodiments of the present application. Figure 5 As shown, in the first aspect, the embodiment of the present application provides a method for repairing bloating of a battery cell 20, wherein the battery cell 20 comprises a shell 22, an electrode assembly 23 and an end cap assembly 21, wherein the shell 22 has an opening, the electrode assembly 23 is arranged inside the shell 22, the end cap assembly 21 is covered at the opening, the end cap assembly 21 comprises an end cap 40 and an insulating member 50, the insulating member 50 is arranged on a side of the end cap 40 facing the electrode assembly 23, the insulating member 50 protrudes toward one side of the electrode assembly 23 to form a bulge 51, and the repair method comprises the following steps:

[0075] Figure 6 It is a schematic diagram of an exploded view of the end cover assembly of some embodiments of the present application.

[0076] like Figure 6 As shown, S10 , drilling a hole into the end cover 40 of the battery cell 20 to form a through hole 41 .

[0077] S20, exhausting the interior of the housing 22;

[0078] Figure 7 It is a partial schematic diagram of the end caps of some other embodiments of the present application.

[0079] like Figure 7 As shown, S21 , inject glue into the raised portion 51 .

[0080] S22, wait for the glue to solidify to form a sealing portion 80.

[0081] Figure 8 It is a schematic diagram of the structure of the end cover of some embodiments of the present application.

[0082] like Figure 8 As shown, S30, using the sealing member 60 to seal the through hole 41;

[0083] In the height direction Z along the battery cell 20 , the orthographic projection of the through hole 41 is located within the range of the orthographic projection of the raised portion 51 .

[0084] The insulating member 50 is a component located between the end cap 40 and the electrode assembly 23. The insulating member 50 can be a plastic member. The insulating member 50 can be prefabricated from plastic or assembled from various plastic parts. The material is an insulating material. The insulating member 50 can be a component of other materials, such as a rubber member. The insulating member 50 mainly has two functions. One is that it can be used to isolate the electrical connection components in the shell 22 from the end cap 40, one is to reduce the risk of short circuit, and the other is to effectively support the end face of the electrode assembly 23. After the electrode assembly 23 is assembled into the shell and the end cap 40 is welded, the internal winding core of the electrode assembly 23 is in a state of slight pressure. If the restraint is not enough, it will easily affect the life of the winding core or cause a short circuit. Therefore, the insulating member 50 can effectively support the end face of the winding core to reduce the possibility of the electrode assembly 23 moving up and down. The insulating member 50 can be connected to the end cap 40 by bonding or clamping.

[0085] The interior of the raised portion 51 is a hollow groove structure. The raised portion 51 can support the main part of the insulating member 50 and can abut against the electrode assembly 23 to increase the fixing effect on the electrode assembly 23 and reduce the possibility of vibration or shaking of the electrode assembly 23 in the shell 22.

[0086] Raised portions 51 may be provided at opposite ends of the end cover 40 along the length direction X of the battery cell 20 to support both ends of the electrode assembly 23 .

[0087] In step S10, a hole may be drilled in the end cap 40 by a punching device, but the insulating member 50 will not be damaged. The through hole 41 may be circular, rectangular, square or other shapes.

[0088] “In the height direction Z along the battery cell 20, the orthographic projection of the through hole 41 is within the range of the orthographic projection of the raised portion 51” means that the area of ​​the through hole 41 is less than or equal to the area of ​​the raised portion 51, and the outer contour of the through hole 41 does not exceed the outer contour of the raised portion 51. Metal chips generated by drilling directly fall into the raised portion 51 and will not directly fall into the interior of the housing 22.

[0089] Even if the insulating member 50 is fixed to the end cap 40, there is still inevitably a certain gap between the insulating member 50 and the end cap 40. In step S20, a pressurized shaping device can be used to shape the shell 22 to restore the bloated shell 22, so that the excess gas in the shell 22 is discharged from the through hole 41. The specific gas discharge path is: from the inside of the shell 22 to the gap between the insulating member 50 and the end cap 40, and then discharged to the outside of the battery cell 20 through the through hole 41.

[0090] In addition, the excess gas inside the shell 22 can be discharged by means of negative pressure vacuuming.

[0091] In steps S21 and S22 , the glue may be an easily curable glue, such as polyurethane hot melt glue, acrylate glue or UV glue, etc., which can be cured in a short time at room temperature to form a solid sealing portion 80 .

[0092] Even though the end cap 40 and the insulating member 50 are fixed, there is still a small gap between the end cap 40 and the insulating member 50. Metal chips are free in the sealed space of the raised portion 51 of the insulating member 50, and after a long period of vibration, they may escape into the interior of the battery cell 20, causing the battery cell 20 to short-circuit and cause a fire failure event.

[0093] In step S30, the shape of the seal 60 can match the through hole 41 so that the seal 60 can be just stuck in the through hole 41. For example, if the through hole 41 is circular, the seal 60 can be a steel column; or if the through hole 41 is rectangular, the seal 60 can be a steel block. The size of the seal 60 can be slightly larger than the size of the through hole 41, so that the seal 60 and the through hole 41 have an interference fit, thereby increasing the sealing effect of the seal 60. The seal 60 can be made of corrosion-resistant, high-temperature-resistant, and high-pressure-resistant materials, such as steel, aluminum alloy, etc.

[0094] In the above solution, since the position of the through hole 41 corresponds to the raised portion 51, when drilling a hole in the end cover 40, the metal chips generated will only fall into the raised portion 51, reducing the probability of the metal chips falling into the interior of the housing 22 and contacting the electrode assembly 23, thereby reducing the risk of short circuit of the battery cell 20 and improving the reliability of the battery cell 20. After the metal chips generated by drilling fall into the raised portion 51, glue is injected into the raised portion 51 to form a sealing portion 80, which seals the metal chips and prevents the metal chips from moving from the gap between the end cover 40 and the insulating member 50 to the interior of the housing 22 to a certain extent, further reducing the risk of short circuit.

[0095] Fig. 9 It is a partial schematic diagram of the end cap of some embodiments of the present application.

[0096] like Fig. 9As shown, in some embodiments, the raised portion 51 includes a plurality of sub-grooves 512 arranged in sequence, and adjacent sub-grooves 512 are separated by reinforcing ribs 513; in the height direction Z, the orthographic projection of the through hole 41 does not overlap with the orthographic projection of the reinforcing rib 513.

[0097] The sub-grooves 512 may be in the shape of a square, a rectangle or other irregular polygons, and the shapes and sizes of the sub-grooves 512 may be the same or different.

[0098] For example, the multiple sub-grooves 512 of each raised portion 51 are arranged in sequence along the width direction Y of the battery cell 20, and the reinforcing ribs 513 are side walls used to separate adjacent sub-grooves 512. The reinforcing ribs 513 can not only separate the sub-grooves 512, but also have the function of increasing the strength of the raised portion 51.

[0099] In the above solution, it is possible to avoid damaging the reinforcing rib 513 during drilling to a certain extent, thereby ensuring the overall strength of the end cover 40 .

[0100] Fig.10 It is a schematic structural diagram of the end caps of other embodiments of the present application.

[0101] like Fig.10 As shown, in some embodiments, the end cover 40 includes two first side edges 42 arranged opposite to each other along the width direction Y, and two second side edges 43 arranged opposite to each other along the length direction X of the battery cell 20, the first side edge 42 is connected to the second side edge 43, and the length of the first side edge 42 is greater than the length of the second side edge 43; the through hole 41 is arranged near the first side edge 42.

[0102] That is, the first side 42 is a long side, and the second side 43 is a short side. The through hole 41 is arranged as close to the first side 42 as possible, so that the through hole 41 is not above the reinforcing rib 513 as much as possible.

[0103] In the above solution, the risk of damaging the reinforcing rib 513 during drilling can be further reduced.

[0104] Fig.11 It is a flow chart of a method for repairing battery monomer bloating according to other embodiments of the present application.

[0105] like Fig.11 As shown, in some embodiments, before step S20 of exhausting the interior of the housing 22, the method further includes:

[0106] Fig.12 It is a partial schematic diagram of the end caps of other embodiments of the present application.

[0107] like Fig.12 As shown, S11, a waterproof film 70 is attached to the through hole 41 of the end cover 40.

[0108] If moisture enters the interior of the battery cell 20 through the through hole 41 , it will cause a chemical reaction inside the battery cell 20 , generating gas, and even causing serious problems such as short circuit and leakage.

[0109] The waterproof film 70 can be quickly attached within 1 minute after drilling, so that the waterproof film 70 covers the entire through hole 41 , thereby reducing the risk of external water vapor entering the interior of the battery cell 20 through the through hole 41 .

[0110] The waterproof membrane 70 may be a one-way breathable membrane made of a polymer waterproof material, which can achieve one-way ventilation, allowing the gas inside the battery cell 20 to be discharged, and prohibiting external moisture from entering the battery cell 20. Alternatively, the waterproof membrane 70 may be an ordinary waterproof breathable membrane, which is bidirectionally breathable but waterproof.

[0111] In the above solution, by attaching the waterproof film 70 after drilling, moisture can be prevented from entering the interior of the battery cell 20 through the through hole 41 to a certain extent, further improving the reliability of the battery cell 20.

[0112] In some embodiments, along the width direction Y of the monomer, the raised portion 51 includes a plurality of sub-grooves 512 arranged in sequence; along the height direction Z, the orthographic projection of the through hole 41 is located within the range of the orthographic projection of one of the sub-grooves 512 , and the sealing portion 80 is located in the sub-groove 512 .

[0113] That is to say, when the raised portion 51 includes multiple sub-grooves 512 , glue is only injected into the sub-groove 512 below the through hole 41 , and the amount of glue is just enough to fill the sub-groove 512 , and there is no need to inject more glue to overflow into other sub-grooves 512 .

[0114] In the above solution, the cost of injecting glue can be reduced by injecting glue only into the sub-grooves 512 corresponding to the through holes 41 .

[0115] In some embodiments, the material of the glue includes polyurethane hot melt adhesive.

[0116] Polyurethane hot melt adhesive refers to hot melt adhesive containing carbamate groups or isocyanate groups in the molecular chain. Polyurethane hot melt adhesive does not react with electrolyte, is resistant to high temperature and high pressure, and can cure quickly.

[0117] Fig.13 It is a flow chart of a method for repairing battery cell bloating in some other embodiments of the present application.

[0118] like Fig.13 As shown, in some embodiments, after the step S30 of sealing the through hole 41 with the sealing member 60, the following steps are further included:

[0119] S40 , sticking the sealant to the through hole 41 of the end cover 40 .

[0120] The sealant can be an aluminum foil tape, butyl rubber or other sealing tape. The sealant can be applied only to the outer periphery of the seal 60 along the edge of the through hole 41 , or the sealant can be applied to the entire seal 60 and the outer periphery of the edge of the through hole 41 .

[0121] In the above solution, the sealant enhances the sealing effect at the through hole 41 .

[0122] In some embodiments, the sealant covers the seal 60 to further enhance the sealing effect.

[0123] In a second aspect, the embodiment of the present application further provides a battery cell 20 prepared according to the above-mentioned repair method.

[0124] Fig.14 yes Fig.10 An enlarged schematic diagram of point A. Fig.15 yes Fig.10 An enlarged schematic diagram of the through hole diameter marked at A.

[0125] like Fig.14 As shown, in some embodiments, the distance between the through hole 41 and the edge of the end cap 40 is L. Fig.15 As shown, the through hole 41 is circular, and the diameter of the through hole 41 is D, and L and D satisfy: 1≤L / D≤14.

[0126] Optionally, L / D can be any value from 1 to 14. Exemplarily, L / D can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 and 14.

[0127] It should be noted that the “spacing L between the through hole 41 and the edge of the end cap 40” refers to the vertical distance from the center of the through hole 41 to the first side 42 or the second side 43 of the end cap 40. For example, if the through hole 41 is circular, the “spacing L between the through hole 41 and the edge of the end cap 40” refers to the vertical distance from the center of the through hole 41 to the first side 42 or the second side 43.

[0128] If the raised portion 51 extends along the width direction Y of the battery cell 20 and is provided at both ends of the battery cell 20 along the length direction X, the distance between the through hole 41 and the second side 43 is L, so that the through hole 41 can be more accurately located above the raised portion 51 .

[0129] In the above solution, the ridge 51 is generally located at the edge of the end cover 40, and the distance between the through hole 41 and the edge of the end cover 40 is within a suitable range, so that the orthographic projection of the through hole 41 is within the range of the orthographic projection of the ridge 51 along the height direction Z of the battery cell 20. At the same time, the diameter of the through hole 41 is within a suitable range, which not only ensures the exhaust speed to a certain extent, but also reduces the risk of external moisture entering the battery cell 20.

[0130] In some embodiments, L and D satisfy: 2.5≤L / D≤10.

[0131] Optionally, L / D may be any value between 2.5 and 10. Exemplarily, L / D may be 2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, or 9.5.

[0132] In the above solution, it is further ensured that the orthographic projection of the through hole 41 can be located within the range of the orthographic projection of the raised portion 51 , further reducing the risk of external moisture entering the interior of the battery cell 20 .

[0133] In a third aspect, an embodiment of the present application further provides a battery device 100 , comprising the above-mentioned battery cell 20 .

[0134] In a fourth aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery device 100, and the battery device 100 is used to provide electrical energy.

[0135] According to some embodiments of the present application, the present application provides a method for repairing bloating of a battery cell 20, wherein the battery cell 20 includes a shell 22, an electrode assembly 23 and an end cover assembly 21, wherein the electrode assembly 23 is arranged inside the shell 22, and the end cover assembly 21 is covered at the opening, and the end cover assembly 21 includes an end cover 40 and an insulating member 50, wherein the insulating member 50 is arranged on a side of the end cover 40 facing the electrode assembly 23, and the insulating member 50 protrudes toward one side of the electrode assembly 23 to form a protrusion 51, and the repair method includes the following steps: drilling a hole into the end cover 40 of the battery cell 20 to form a through hole 41; venting the inside of the shell 22; injecting glue into the protrusion 51; waiting for the glue to cure to form a sealing portion 80; and using a sealing member 60 to seal the through hole 41; wherein, in the height direction Z along the battery cell 20, the orthographic projection of the through hole 41 is located within the range of the orthographic projection of the protrusion 51. In some embodiments, before the step S20 of exhausting the interior of the shell 22 , the method further includes: S11 , attaching a waterproof film 70 to the through hole 41 of the end cover 40 .

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for repairing battery monomer bloating, characterized in that: The battery cell comprises a shell, an electrode assembly and an end cap assembly, the shell has an opening, the electrode assembly is arranged inside the shell, the end cap assembly is covered at the opening, the end cap assembly comprises an end cap and an insulating member, the insulating member is arranged on a side of the end cap facing the electrode assembly, the insulating member protrudes toward one side of the electrode assembly to form a ridge, and the ridge comprises a plurality of sub-grooves arranged in sequence along the width direction of the battery cell, and the repair method comprises the following steps: Drilling a hole into the end cover of the battery cell to form a through hole; exhausting the interior of the housing; injecting glue into the raised portion; Waiting for the glue to solidify to form a sealing portion; Using a sealing member to seal the through hole; Wherein, in the height direction of the battery cell, the orthographic projection of the through hole is located within the range of the orthographic projection of the raised portion.

2. The repair method according to claim 1, characterized in that: Adjacent sub-grooves are separated by reinforcing ribs; In the height direction, the orthographic projection of the through hole does not overlap with the orthographic projection of the reinforcing rib.

3. The repair method according to claim 2, characterized in that: The end cover comprises two first side edges arranged opposite to each other along the width direction, and two second side edges arranged opposite to each other along the length direction of the battery cell, the first side edge is connected to the second side edge, and the length of the first side edge is greater than the length of the second side edge; The through hole is arranged close to the first side.

4. The repair method according to claim 1, characterized in that: Before the step of exhausting the interior of the housing, the method further includes: A waterproof film is attached to the through hole of the end cover.

5. The repair method according to claim 1, characterized in that: In the height direction, the orthographic projection of the through hole is located within the range of the orthographic projection of one of the sub-grooves, and the sealing portion is located in the sub-groove.

6. The repair method according to claim 1, characterized in that: The material of the glue includes polyurethane hot melt adhesive.

7. The repair method according to claim 1, characterized in that: After the step of sealing the through hole with a sealant, the step further includes: The sealant is pasted on the through hole of the end cover.

8. The repair method according to claim 7, characterized in that: The sealant covers the sealing member.

9. A battery cell, characterized in that: Prepared according to the repair method according to any one of claims 1-8.

10. The battery cell according to claim 9, characterized in that: The distance between the through hole and the edge of the end cover is L, the through hole is circular, the diameter of the through hole is D, and L and D satisfy: 1≤L / D≤14.

11. The battery cell according to claim 9, characterized in that: The L and D satisfy: 2.5≤L / D≤10.

12. A battery device, characterized in that: Comprising a battery cell according to any one of claims 9 to 11.

13. An electrical device, characterized in that: The battery device according to claim 12 is included, and is used to provide electrical energy.

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