Battery

Abstract

The present application relates to the field of battery energy technology, and in particular to a battery. The battery includes a shell, a shell cover, an explosion-proof sheet, and a battery cell located in the shell. The shell cover is arranged on the shell, and the shell cover is provided with a mounting hole. The explosion-proof sheet covers the mounting hole and is connected to the shell cover. The explosion-proof sheet includes a reinforcement part and an explosion-proof part. The reinforcement part is welded to the side wall of the mounting hole. The explosion-proof part is located in the reinforcement part, and the explosion-proof part is provided with an explosion-proof notch. By welding the explosion-proof sheet on the shell cover, the explosion-proof sheet can be made of different materials to achieve a better explosion-proof effect. In addition, the method of welding the explosion-proof sheet is conducive to reducing the requirements for the location of the explosion-proof notch. The reinforcement parts arranged around the explosion-proof part can effectively protect the explosion-proof part when it falls, and prevent the explosion-proof notch from being dropped open, thereby solving the problem that the explosion-proof valve is easily dropped open when the battery falls, causing explosion-proof failure and battery failure.

Description

Technical Field

[0001] The present application relates to the field of battery energy technology, and in particular to a battery. Background Art

[0002] As the market demand for battery capacity increases, battery technology has developed rapidly, and people have put forward higher requirements for battery energy density, fast charging capability, and charge and discharge rate. High energy density fast charging batteries are also the development trend of consumer batteries. As a result, the gas production and short circuit risks of batteries during use continue to increase. In order to solve the problem of explosion caused by battery failure and harm to users, the existing technology has designed explosion-proof valves to release pressure when the battery fails.

[0003] However, many explosion-proof valves of batteries currently cannot be activated. The main reasons are: 1. Making explosion-proof notches on the shell or shell cover is a relatively common method to achieve explosion-proof, but since the notches only change the local strength of the shell by changing the thickness of the shell or shell cover, thereby playing an explosion-proof role, this method has certain failure cases; 2. The position of the explosion-proof notches on the shell or shell cover is unreasonable, which is not conducive to the opening of the explosion-proof valve, resulting in failure of the explosion-proof valve; 3. When the battery with explosion-proof notches falls, the explosion-proof valve is easily opened, resulting in failure of the explosion-proof valve, thereby causing battery failure. Utility Model Content

[0004] Based on this, the present application provides a battery to solve the problem in the related art that the battery shell has poor explosion-proof properties and explosion-proof failure, resulting in battery failure.

[0005] On the one hand, the present application provides a battery, comprising a shell, a shell cover, an explosion-proof plate, and a battery cell located in the shell, wherein the shell cover is arranged on the shell, the shell cover is provided with a mounting hole, the explosion-proof plate covers the mounting hole, and is connected to the shell cover;

[0006] The explosion-proof disc includes a reinforcement portion and an explosion-proof portion, and the reinforcement portion is welded to the side wall of the mounting hole;

[0007] The explosion-proof part is located inside the reinforcement part, and explosion-proof notches are arranged on the explosion-proof part.

[0008] In a possible implementation, the linear expansion coefficient of the bursting disk is greater than the linear expansion coefficient of the shell cover.

[0009] In a possible implementation, the distance between the edge of the mounting hole and the edge of the housing and / or the housing cover is greater than or equal to 5 mm, and / or

[0010] The ratio of the area of ​​the mounting hole to the area of ​​the surface of the shell and / or shell cover where the mounting hole is arranged is in the range of 1%-15%.

[0011] In a possible implementation, the battery further includes a connector, and the side surface of the reinforcement portion is connected to the shell cover via the connector, and the surface of the connector is not higher than the surface of the shell cover.

[0012] In a possible implementation, along the thickness direction of the explosion-proof plate, the thickness of the reinforcement portion is H1, the thickness of the explosion-proof portion is H2, and the thickness of the explosion-proof notch is H3; wherein H1, H2 and H3 satisfy:

[0013] 1 / 3H1≤H2≤2 / 3H1; and / or

[0014] 1 / 4H2≤H3≤2 / 3H2.

[0015] In a possible implementation, along the width direction of the explosion-proof disk, the width of the explosion-proof disk is W1, the width of the explosion-proof portion is W2; the width of the explosion-proof notch itself is W3; wherein W1, W2 and W3 satisfy:

[0016] W1 ranges from 3mm to 40mm; and / or

[0017] W2 ranges from 1mm to 38mm; and / or

[0018] The range of W3 is 0.01mm-2mm.

[0019] In a possible implementation, the width of the reinforcement portion itself ranges from 1 mm to 10 mm; and / or

[0020] Along the length direction of the explosion-proof disk, the length of the explosion-proof disk is L1, and the length of the explosion-proof portion is L2; ​​wherein L1 and L2 satisfy:

[0021] L1 ranges from 3mm to 60mm; and / or

[0022] The range of L2 is 1mm-58mm.

[0023] In a possible implementation, both ends of the explosion-proof notch in the length direction are respectively connected to the reinforcement part, so that the explosion-proof part is divided into a plurality of explosion-proof zones.

[0024] In a possible implementation, the explosion-proof notch is arc-shaped, and two ends of the explosion-proof notch in the length direction are respectively connected to one side of the reinforcement portion in the width direction.

[0025] In a possible implementation, along the width direction of the shell cover, the distance between the center of the burst-proof disk and the edge of the shell cover in the width direction is W4; along the length direction of the shell cover, the distance between the center of the burst-proof disk and the edge of the shell cover in the length direction is L3; along the width direction of the burst-proof disk, the width of the burst-proof disk is W1, and along the length direction of the burst-proof disk, the length of the burst-proof disk is L1, wherein W4 and L3 satisfy:

[0026] W4≥1 / 2W1+5mm; and / or

[0027] L3≥1 / 2L1+5mm.

[0028] In a possible implementation, hot melt adhesive is provided in the shell, and in the thickness direction of the battery, the projection of the explosion-proof sheet and the projection of the hot melt adhesive at least partially overlap.

[0029] The explosion-proof shell and battery provided by the present application are characterized in that the explosion-proof part is arranged in the reinforcement part, the explosion-proof part is provided with explosion-proof notches, the reinforcement part is welded to the side wall of the mounting hole, and the explosion-proof piece is welded on the shell cover. Therefore, the explosion-proof piece can be made of a material different from that of the shell and the shell cover, and a material with better expansion characteristics can be used to make the explosion-proof piece have a better explosion-proof effect. In addition, the explosion-proof method of welding the explosion-proof piece is beneficial to reducing the requirements for the setting position of the explosion-proof notches. The reinforcement parts arranged around the explosion-proof part can effectively protect the explosion-proof part when it falls, and prevent the explosion-proof notches from being dropped open, thereby solving the problem that the explosion-proof valve is easily dropped open when the battery falls, causing explosion-proof failure and leading to battery failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0032] Figure 2 for Figure 1 A schematic diagram of the exploded structure of the battery shown;

[0033] Figure 3 A schematic diagram of the structure of the explosion-proof disk provided in the embodiment of the present application;

[0034] Figure 4 for Figure 3 A cross-sectional view of the explosion-proof disk along direction A shown;

[0035] Figure 5 for Figure 4 An enlarged schematic diagram of part B of the bursting disk is shown;

[0036] Figure 6 for Figure 3 A cross-sectional view of the explosion-proof disk along the direction C shown;

[0037] Figure 7 for Figure 1 A schematic structural diagram of the battery from another perspective;

[0038] Figure 8 for Figure 7 A cross-sectional view of the battery shown along direction D;

[0039] Fig. 9 for Figure 8 An enlarged schematic diagram of the battery portion E is shown;

[0040] Fig.10 for Fig. 9 An enlarged schematic diagram of part F of the battery is shown.

[0041] Description of reference numerals:

[0042] 100-explosion-proof shell; 10-shell; 20-shell cover; 21-mounting hole; 30-explosion-proof plate; 31-reinforcement part; 32-explosion-proof part; 321-explosion-proof area; 33-explosion-proof notch; 40-connector; 200-battery; 201-negative electrode adapter; 202-positive electrode adapter; 203-negative electrode ear insulation glue; 204-positive electrode ear insulation glue; 205-negative electrode reinforcement plate; 206-sealing plate; 207-positive electrode column; 208-positive electrode external insulation glue; 209-positive electrode internal insulation glue; 210-positive electrode ear transfer welding plate; 300-battery cell; 301-negative electrode ear; 302-positive electrode ear. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0044] In the description of this application, it should 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, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0046] The terms "first", "second" and "third" (if any) in the specification and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0047] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0048] As the market demand for battery capacity increases, battery technology has developed rapidly, and people have put forward higher requirements for battery energy density, fast charging capability, and charge and discharge rate. High energy density fast charging batteries are also the development trend of consumer batteries. As a result, the gas production and short circuit risks of batteries during use continue to increase. In order to solve the problem of explosion caused by battery failure and harm to users, the existing technology has designed explosion-proof valves to release pressure when the battery fails.

[0049] However, many explosion-proof valves of batteries currently cannot be activated. The main reasons are: 1. Making explosion-proof notches on the shell or shell cover is a relatively common method to achieve explosion-proof, but since the notches only change the local strength of the shell by changing the thickness of the shell or shell cover, thereby playing an explosion-proof role, this method has certain failure cases; 2. The position of the explosion-proof notches on the shell or shell cover is unreasonable, which is not conducive to the opening of the explosion-proof valve, resulting in failure of the explosion-proof valve; 3. When the battery with explosion-proof notches falls, the explosion-proof valve is easily opened, resulting in failure of the explosion-proof valve, thereby causing battery failure.

[0050] After repeated thinking and verification, the inventors found that if the material of the explosion-proof plate is replaced with a material with better expansion properties, and the explosion-proof plate is connected to the shell or shell cover by welding, a better explosion-proof effect can be achieved. In addition, the welding method can widen the setting position of the explosion-proof plate, reducing the requirements for the location of the explosion-proof notch. Reinforcing ribs are set on the periphery of the explosion-proof plate to effectively protect the explosion-proof plate when it falls and prevent the explosion-proof plate from being dropped. This solves the problem that the explosion-proof valve is easily dropped when the battery falls, causing explosion-proof failure and leading to battery failure.

[0051] In view of this, the present application provides a battery, comprising a shell, a shell cover, an explosion-proof plate and a battery cell located in the shell, the shell cover is arranged on the shell, the shell cover is provided with a mounting hole, the explosion-proof plate covers the mounting hole and is connected to the shell cover; the explosion-proof plate comprises a reinforcement part and an explosion-proof part, the reinforcement part is welded to the side wall of the mounting hole; the explosion-proof part is located in the reinforcement part, and the explosion-proof part is provided with an explosion-proof notch.

[0052] The explosion-proof part is arranged in the reinforced part, explosion-proof notches are arranged on the explosion-proof part, the reinforced part is welded to the side wall of the mounting hole, and the explosion-proof piece is welded on the shell cover. Therefore, the explosion-proof piece can be made of a material different from that of the shell and the shell cover, and a material with better expansion characteristics can be used to make the explosion-proof piece have a better explosion-proof effect. In addition, explosion-proofing by welding the explosion-proof piece is beneficial to reducing the requirements for the location of the explosion-proof notches. The reinforced parts arranged around the explosion-proof part can effectively protect the explosion-proof part when it falls, and prevent the explosion-proof notches from being dropped open, thereby solving the problem that the explosion-proof valve is easily dropped open when the battery falls, causing explosion-proof failure and leading to battery failure.

[0053] The contents of the present application will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can understand the contents of the present application more clearly and in detail.

[0054] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application. Figure 2 for Figure 1 Schematic diagram of the exploded structure of the battery shown. Figure 3 A schematic diagram of the structure of the explosion-proof disk provided in an embodiment of the present application. Figure 4 for Figure 3 The cross-sectional view of the bursting disk along direction A is shown. Figure 5 for Figure 4 An enlarged schematic diagram of part B of the bursting disk is shown. Figure 6 for Figure 3 The cross-sectional view of the bursting disk is shown along the C direction. Figure 7 for Figure 1 A schematic structural diagram of the battery shown from another perspective. Figure 8 for Figure 7 The battery is shown in a cross-sectional view along direction D. Fig. 9 for Figure 8An enlarged schematic diagram of portion E of the battery is shown. Fig.10 for Fig. 9 An enlarged schematic diagram of part F of the battery is shown.

[0055] like Figure 1 and Figure 2 As shown, the battery 200 provided in the embodiment of the present application includes an explosion-proof housing 100 and a battery cell 300. The battery cell 300 is located in the explosion-proof housing 100.

[0056] The explosion-proof shell 100 is used to encapsulate the battery cell 300 to protect the battery cell 300. During the use of the battery 200, if the gas production of the battery cell 300 is too high or a short circuit occurs, the battery 200 will fail and explode. The explosion-proof shell 100 can relieve the pressure on the battery 200, thereby reducing the damage to the user.

[0057] Specifically, the explosion-proof housing 100 includes a housing 10, a housing cover 20 and an explosion-proof disk 30. The housing cover 20 is disposed on the housing 10. The explosion-proof disk 30 is disposed on the housing 10 and / or the housing cover 20. The housing 10 cooperates with the housing cover 20 to accommodate the battery cell 300. The linear expansion coefficient of the explosion-proof disk 30 is greater than 23*10^-6 / k. The explosion-proof disk 30 is used to release pressure when the internal pressure of the battery is too high to ensure the safety of the battery.

[0058] The linear expansion coefficient of the bursting disk 30 is greater than the linear expansion coefficient of the housing cover 20 .

[0059] In the embodiment of the present application, the explosion-proof housing 100 is a steel shell, which improves the safety performance of the battery 200.

[0060] At 0-100°C, the linear expansion coefficient of the shell 10 and the shell cover 20 is 16*10^-6 / k. It is obvious that within the temperature range of 0-100°C, when the battery undergoes thermal runaway, the explosion-proof plate 30 can undergo linear deformation to a greater extent than the shell 10 and the shell cover 20, so the explosion-proof plate 30 is easier to open.

[0061] In a possible implementation, the explosion-proof housing 100 further includes an insulating layer, which is disposed on the inner surfaces of the housing 10 and the housing cover 20 to prevent the internal components of the battery from directly contacting the steel housing.

[0062] The housing 10 and / or the housing cover 20 are provided with a mounting hole 21. The mounting hole 21 corresponds to the explosion-proof disk 30. The explosion-proof disk 30 covers the mounting hole 21. The mounting hole 21 is used for welding and mounting the explosion-proof disk 30, so that the explosion-proof disk 30 is connected to the housing 10 and / or the housing cover 20.

[0063] like Figures 3 to 6As shown, the explosion-proof sheet 30 includes a reinforcement portion 31 and an explosion-proof portion 32. The reinforcement portion 31 is arranged around the explosion-proof portion 32. The reinforcement portion 31 is annular. The explosion-proof portion 32 is arranged in the reinforcement portion 31. An explosion-proof notch 33 is arranged on the explosion-proof portion 32. The explosion-proof portion 32 is a pressure relief portion of the explosion-proof sheet 30, and explodes when the air pressure is too high through the explosion-proof notch 33, thereby releasing the pressure inside the battery 200.

[0064] Specifically, the reinforcement portion 31 is welded to the side wall of the mounting hole 21 .

[0065] The explosion-proof plate 30 is generally convex on all sides (reinforced portion 31 ) and has a concave structure in the center (explosion-proof portion 32 ), and the concave area is used to design an explosion-proof notch 33 .

[0066] The reinforcement part 31 is used to protect the explosion-proof part 32, which is equivalent to the reinforcement rib on the explosion-proof plate 30, and can effectively protect the explosion-proof part 32. When the battery 200 falls, it prevents the explosion-proof part 32 from falling off, causing the explosion-proof plate 30 to fail.

[0067] In a possible implementation, the explosion-proof disc 30 may be directly provided with an explosion-proof portion 32, and an explosion-proof notch 33 may be provided on the explosion-proof portion 32. In a possible implementation, the explosion-proof disc 30 is an integrally formed structure, which improves the stability of the structure of the explosion-proof disc 30 and facilitates processing and manufacturing.

[0068] In a possible implementation, the explosion-proof disk 30 is made of a material different from that of the housing 10 and the housing cover 20 .

[0069] In a possible implementation, the explosion-proof disk 30 is made of a metal material and can be directly connected to the housing 10 or the housing cover 20 by welding.

[0070] Preferably, the explosion-proof disk 30 is made of MFX2 aluminum material, and the linear expansion coefficient of MFX2 aluminum material is 23.5*10^-6 / k at 0-100°C.

[0071] MFX2 aluminum is a high-performance, high-formability aluminum material with excellent formability in terms of bulging (Erichsen value of 10.5 or more, cupping test), excellent heat dissipation (conductivity of 50% IACS or more), and a tensile strength of 110 (N / mm 2 ), yield stress is 65(N / mm 2 ), electrical conductivity is 51 (% IACS), thermal conductivity is 200 (W / m·℃). In addition, MFX2 aluminum has a total elongation of 40% and a local elongation of 10% or more. Therefore, compared with the materials of the shell 10 and the shell cover 20 currently used, MFX2 aluminum has better expansion characteristics and can play a better explosion-proof role.

[0072] In a possible implementation, the ratio of the area of ​​the mounting hole 21, that is, the area of ​​the explosion-proof disk 30, to the area of ​​the surface of the housing 10 and / or the housing cover 20 where the mounting hole 21 is provided is in the range of 1%-15%.

[0073] By adjusting the area ratio of the explosion-proof disc 30, the bursting pressure value of the explosion-proof disc 30 can be adjusted. When the area of ​​the explosion-proof disc 30 accounts for 1% to 15% of the area of ​​the housing 10 and / or the housing cover 20, when the battery 200 short-circuits or produces too much gas, when the gas pressure reaches a preset value of 0.1 MPa to 4 MPa, the explosion-proof disc 30 made of MFX2 aluminum material will explode and release pressure in time, thereby preventing the battery 200 from failing and protecting the safety of the user.

[0074] In a possible implementation, the area of ​​the explosion-proof disk 30 is between 10 square millimeters and 100 square millimeters.

[0075] like Figure 3 As shown, in the embodiment of the present application, the explosion-proof disc 30 is roughly elliptical, wherein the short axis direction of the ellipse is the width direction of the explosion-proof disc 30 , and the long axis direction of the ellipse is the length direction of the explosion-proof disc 30 .

[0076] In a possible implementation, along the length direction of the explosion-proof disk 30 , the length of the explosion-proof disk 30 is L1, that is, the length of the outer periphery of the reinforcement portion 31 is L1. The length of the explosion-proof portion 32 is L2, that is, the length of the inner periphery of the reinforcement portion 31 is L2.

[0077] Among them, L1 and L2 satisfy: the range of L1 is 3mm-60mm; the range of L2 is 1mm-58mm.

[0078] In a possible implementation, along the width direction of the explosion-proof disk 30 , the width of the explosion-proof disk 30 is W1 , that is, the width of the outer circumference of the reinforcement portion 31 is W1 . The width of the explosion-proof portion 32 is W2 , that is, the width of the inner circumference of the reinforcement portion 31 is W2 .

[0079] The explosion-proof notch 33 is a strip-shaped mark carved on the explosion-proof portion 32, and is used to control the rupture position and shape of the explosion-proof portion 32. The width of the explosion-proof notch 33 itself is W3.

[0080] Among them, W1, W2 and W3 satisfy: the range of W1 is 3mm-40mm; the range of W2 is 1mm-38mm; the range of W3 is 0.01mm-2mm.

[0081] In a possible implementation, the annular reinforcement portion 31 has a width ranging from 1 mm to 10 mm.

[0082] A reinforcing portion 31 of sufficient width can protect the explosion-proof disc 30 when it falls, and prevent the explosion-proof notch 33 from falling open. If the reinforcing portion 31 is too wide, the overall strength of the explosion-proof disc 30 will be too large, and the explosion-proof notch 33 cannot be opened during normal use. Therefore, in the embodiment of the present application, the width of the reinforcing portion 31 ranges from 1 mm to 10 mm.

[0083] In a possible implementation, both ends of the explosion-proof notch 33 in the length direction are respectively connected to the reinforcing portion 31 , thereby dividing the explosion-proof portion 32 into a plurality of explosion-proof zones 321 .

[0084] In a possible implementation, two explosion-proof notches 33 are provided, and the two explosion-proof notches 33 divide the explosion-proof portion 32 into three explosion-proof areas 321 .

[0085] In a possible implementation, the two explosion-proof notches 33 are symmetrically arranged along the width direction of the explosion-proof disk 30 .

[0086] The symmetrically designed explosion-proof notches 33 can improve the structural strength of the explosion-proof disc 30 and prevent the explosion-proof notches 33 from opening when the disc 30 falls.

[0087] In a possible implementation, the explosion-proof notch 33 is arc-shaped, and two ends of the explosion-proof notch 33 in the length direction are respectively connected to one side of the reinforcement portion 31 in the width direction.

[0088] The arc-shaped explosion-proof notch 33 can disperse the force more evenly when the explosion-proof notch 33 is subjected to pressure or impact force, thereby preventing the explosion-proof notch 33 from opening when falling.

[0089] The shape of the explosion-proof notch 33 can be designed according to the actual explosion-proof requirements of the battery 200 and is not limited to an arc shape, but can also be other shapes such as a circle, an S shape, a V shape, etc.

[0090] In a possible implementation, along the thickness direction of the explosion-proof plate 30 , the thickness of the reinforcement portion 31 is H1 , the thickness of the explosion-proof portion 32 is H2 , and the thickness of the explosion-proof notch 33 is H3 .

[0091] Among them, H1, H2 and H3 satisfy: 1 / 3H1≤H2≤2 / 3H1; 1 / 4H2≤H3≤2 / 3H2.

[0092] Preferably, H2=2 / 3H1, H3=2 / 3H2.

[0093] In a possible implementation, the distance between the edge of the mounting hole 21 and the edge of the housing 10 and / or the housing cover 20 is greater than or equal to 5 mm. That is, the distance between the edge of the explosion-proof disk 30 and the edge of the housing 10 and / or the housing cover 20 is greater than or equal to 5 mm.

[0094] like Figure 7 As shown, the explosion-proof disk 30 is disposed on the shell cover 20 , and the width direction of the explosion-proof disk 30 is parallel to the width direction of the shell cover 20 .

[0095] In the width direction of the housing cover 20, the distance between the center of the burst disk 30 and the edge of the housing cover 20 in the width direction is W4.

[0096] In the length direction of the shell cover 20, the distance between the center of the explosion-proof disk 30 and the edge of the shell cover 20 in the length direction is L3.

[0097] Among them, W4 and L3 satisfy: W4≥1 / 2W1+5mm; L3≥1 / 2L1+5mm.

[0098] In a possible implementation, hot melt adhesive is provided in the housing 10 , and in the thickness direction of the battery, the projection of the explosion-proof sheet 30 at least partially overlaps with the projection of the hot melt adhesive.

[0099] The explosion-proof method of making explosion-proof notches on the shell 10 or the shell cover 20 by changing the thickness of the shell 10 or the shell cover 20 needs to be set at a suitable position to achieve a better explosion-proof effect. For example, the explosion-proof notches on the shell 10 or the shell cover 20 need to avoid adhesive materials such as hot melt adhesive inside the battery, because when the battery fails and produces a large amount of gas, the above-mentioned adhesive tape will adhere to the explosion-proof notches, resulting in the explosion-proof valve being unable to be broken through by the gas, resulting in a situation where pressure cannot be relieved.

[0100] The explosion-proof method of welding the explosion-proof disc 30 on the shell 10 or the shell cover 20 will reduce the requirements for the location of the explosion-proof disc 30. It is only necessary to control the distance between the edge of the explosion-proof disc 30 (i.e., the edge of the reinforcement part 31) and the edge of the shell 10 or the shell cover 20 within a range of ≥5mm when welding the explosion-proof disc 30, and then effectively weld the explosion-proof disc 30. Moreover, the explosion-proof disc 30 is made of a material different from that of the shell 10 and the shell cover 20, such as MFX2 aluminum, which has a smoother surface and will not adhere to adhesive materials such as hot melt adhesive. Therefore, in the thickness direction of the battery 200, the projection of the location where the explosion-proof disc 30 is set can overlap with the hot melt adhesive at least partially, or can be parallel to the hot melt adhesive and other materials. When the battery fails and produces a large amount of gas, due to the material characteristics of the explosion-proof disc 30, it will become the weakest part of the entire battery. The explosion-proof disc 30 does not need to avoid the hot melt adhesive inside the battery, and will not fail. It can be effectively opened by the gas for pressure relief.

[0101] like Figures 8 to 10 As shown, in a possible implementation, the thickness of the reinforcing portion 31 is equal to the thickness of the housing 10 and / or the housing cover 20 , and the surface of the reinforcing portion 31 is flush with the surface of the housing 10 and / or the housing cover 20 .

[0102] Specifically, the explosion-proof housing 100 further includes a connector 40. The connector 40 is used to connect the side surface of the reinforcement portion 31 with the housing 10 and / or the housing cover 20. The surface of the connector 40 is not higher than the surface of the housing 10 and / or the housing cover 20.

[0103] In a possible implementation, the connector 40 is melted solder paste, such as tin paste.

[0104] After the explosion-proof disc 30 is welded to the housing 10 and / or the housing cover 20 through the connector 40, the explosion-proof disc 30 and the connector 40 are kept flush with the surface of the housing 10 and / or the housing cover 20. They do not protrude from the battery 200, which can reduce the impact of welding the explosion-proof disc 30 and the connector 40 on the thickness of the battery 200, thereby improving the appearance flatness and the energy density of the battery.

[0105] In a possible implementation, the explosion-proof disk 30 is welded to the side wall of the installation hole 21 by a tunnel furnace.

[0106] like Fig.10 As shown, during tunnel furnace welding, solder paste is applied to the side of the reinforcement portion 31 and the side wall of the mounting hole 21, and the tunnel is heated. At high temperature, the solder paste bonds the explosion-proof disk 30 to the side wall of the mounting hole 21 to form a connector 40. The welding mark of the connector 40 will not be higher than the shell 10 and / or the shell cover 20, and the weld will be smooth and will not protrude. Therefore, the problem of the protruding weld caused by other welding methods affecting the thickness of the battery 200 can be effectively solved.

[0107] In a possible implementation, the outer surface of the bursting disk 30 is coated with an anti-corrosion coating to improve its durability.

[0108] The explosion-proof shell 100 provided in the embodiment of the present application includes a shell 10, a shell cover 20 and an explosion-proof plate 30. The shell cover 20 is arranged on the shell 10. The shell cover 20 is provided with a mounting hole 21. The mounting hole 21 corresponds to the explosion-proof plate 30. The explosion-proof plate 30 includes a reinforcement part 31 and an explosion-proof part 32. The reinforcement part 31 is welded to the side wall of the mounting hole 21. The explosion-proof part 32 is arranged in the reinforcement part 31. The explosion-proof part 32 is provided with an explosion-proof notch 33.

[0109] The explosion-proof portion 32 is arranged in the reinforcement portion 31, and an explosion-proof notch 33 is arranged on the explosion-proof portion 32. The reinforcement portion 31 is welded to the side wall of the mounting hole 21, so that the explosion-proof piece 30 is welded on the shell cover 20. Therefore, the explosion-proof piece 30 can be made of a material different from that of the shell 10 and the shell cover 20, and a material with better expansion characteristics can be used to make the explosion-proof piece 30 have a better explosion-proof effect. In addition, the explosion-proof method of welding the explosion-proof piece 30 is beneficial to reducing the requirements for the setting position of the explosion-proof notch 33. The reinforcement portion 31 arranged around the explosion-proof portion 32 can effectively protect the explosion-proof portion 32 when it falls, and prevent the explosion-proof notch 33 from being dropped open, thereby solving the problem that the explosion-proof valve is easily dropped open when the battery falls, causing explosion-proof failure and battery failure.

[0110] In addition, the embodiment of the present application further provides a battery 200 , which includes an explosion-proof housing 100 and a battery cell 300 . The battery cell 300 is located in the explosion-proof housing 100 .

[0111] The battery 200 further includes a negative electrode adapter 201, a positive electrode adapter 202, a negative electrode ear insulation glue 203, a positive electrode ear insulation glue 204, a negative electrode reinforcement sheet 205, a sealing sheet 206, a positive electrode column 207, a positive electrode external insulation glue 208, a positive electrode internal insulation glue 209 and a positive electrode ear welding sheet 210. The battery cell 300 is provided with a negative electrode ear 301 and a positive electrode ear 302.

[0112] The battery 200 is not limited to a lithium battery, and in the future this technology may be applied to sodium batteries, etc. In the present embodiment, a lithium-ion battery is preferred.

[0113] The specific structure, working principle and function of the explosion-proof housing 100 have been described in detail in the above embodiments and will not be repeated here. It should be noted that the preparation process of the lithium-ion battery 200 is as follows:

[0114] The first step: assemble the negative electrode reinforcement sheet 205, the positive electrode column 207, the positive electrode external insulating glue 208, the positive electrode internal insulating glue 209 and the positive electrode ear transfer welding sheet 210 with the shell 10 into a shell assembly.

[0115] Step 2: ultrasonically weld the negative electrode adapter 201 and the negative electrode ear 301 together, and affix the negative electrode ear insulating glue 203; ultrasonically weld the positive electrode adapter 202 and the positive electrode ear 302 together, and affix the positive electrode ear insulating glue 204.

[0116] Step 3: Apply solder paste evenly to the side of the reinforcement part 31 of the explosion-proof disc 30 and the side wall of the mounting hole 21, assemble the explosion-proof disc 30 and the mounting hole 21, and then weld them together in a tunnel furnace to ensure that the shell cover 20 is flat and has no protrusions after the explosion-proof disc 30 is welded.

[0117] Step 4: The assembled battery cell 300 and the assembled housing 10 are welded together by laser.

[0118] Step 5: The shell cover 20 with the explosion-proof disk 30 assembled and welded together with the shell 10 with the battery cell 300 are then laser welded together.

[0119] Step 6: After baking, liquid injection and other processes.

[0120] Step 7: Laser weld the sealing sheet 206 and the injection hole on the shell 10 together, and then proceed to the subsequent process to obtain a lithium-ion battery.

[0121] The electrolyte is a commercially available conventional electrolyte, and the lithium salt therein is LiFP6.

[0122] The battery 200 provided in the embodiment of the present application is provided with an explosion-proof portion 32 in the reinforcement portion 31, and an explosion-proof notch 33 is provided on the explosion-proof portion 32. The reinforcement portion 31 is welded to the side wall of the mounting hole 21, so that the explosion-proof plate 30 is welded on the shell cover 20. Therefore, the explosion-proof plate 30 can be made of a material different from that of the shell 10 and the shell cover 20, and a material with better expansion characteristics can be used to make the explosion-proof plate 30 have a better explosion-proof effect. In addition, the explosion-proof method of welding the explosion-proof plate 30 is beneficial to reducing the requirements for the setting position of the explosion-proof notch 33. The reinforcement portion 31 arranged around the explosion-proof portion 32 can effectively protect the explosion-proof portion 32 when it falls, and prevent the explosion-proof notch 33 from being dropped open, thereby solving the problem that the explosion-proof valve is easily dropped open when the battery falls, causing explosion-proof failure and leading to battery failure.

[0123] 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 it. 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 with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: It comprises a shell, a shell cover, an explosion-proof plate and a battery cell located in the shell, wherein the shell cover is arranged on the shell, the shell cover is provided with a mounting hole, the explosion-proof plate covers the mounting hole and is connected to the shell cover; The explosion-proof plate comprises a reinforcement portion and an explosion-proof portion, and the reinforcement portion is welded to the side wall of the mounting hole; The explosion-proof part is located inside the reinforcement part, and explosion-proof notches are arranged on the explosion-proof part.

2. The battery according to claim 1, characterized in that The linear expansion coefficient of the explosion-proof disk is greater than the linear expansion coefficient of the shell cover.

3. The battery according to claim 1, characterized in that in, The distance between the edge of the mounting hole and the edge of the housing and / or the housing cover is greater than or equal to 5 mm, and / or The ratio of the area of ​​the mounting hole to the area of ​​the surface of the shell and / or the shell cover where the mounting hole is arranged is in the range of 1%-15%.

4. The battery according to claim 1, characterized in that The battery further includes a connecting piece, and the side surface of the reinforcing portion is connected to the shell cover through the connecting piece, and the surface of the connecting piece is not higher than the surface of the shell cover.

5. The battery according to claim 1, characterized in that Along the thickness direction of the explosion-proof plate, the thickness of the reinforcement portion is H1, the thickness of the explosion-proof portion is H2, and the thickness of the explosion-proof notch is H3; wherein H1, H2 and H3 satisfy: 1 / 3H1≤H2≤2 / 3H1; and / or 1 / 4H2≤H3≤2 / 3H2.

6. The battery according to claim 1, characterized in that Along the width direction of the explosion-proof plate, the width of the explosion-proof plate is W1, the width of the explosion-proof portion is W2; the width of the explosion-proof notch itself is W3; wherein W1, W2 and W3 satisfy: W1 ranges from 3mm to 40mm; and / or W2 ranges from 1mm to 38mm; and / or The range of W3 is 0.01mm-2mm.

7. The battery according to claim 1, characterized in that The width of the reinforcement portion itself ranges from 1 mm to 10 mm; and / or Along the length direction of the explosion-proof disk, the length of the explosion-proof disk is L1, and the length of the explosion-proof portion is L2; ​​wherein L1 and L2 satisfy: L1 ranges from 3mm to 60mm; and / or The range of L2 is 1mm-58mm.

8. The battery according to claim 1, characterized in that Both ends of the explosion-proof notch in the length direction are respectively connected to the reinforcement part, so that the explosion-proof part is divided into a plurality of explosion-proof zones.

9. The battery according to claim 1, characterized in that The explosion-proof notch is arc-shaped, and two ends of the explosion-proof notch in the length direction are respectively connected to one side of the reinforcement part in the width direction.

10. The battery according to claim 1, characterized in that Along the width direction of the shell cover, the distance between the center of the bursting disc and the edge of the shell cover in the width direction is W4; along the length direction of the shell cover, the distance between the center of the bursting disc and the edge of the shell cover in the length direction is L3; along the width direction of the bursting disc, the width of the bursting disc is W1, and along the length direction of the bursting disc, the length of the bursting disc is L1, wherein W4 and L3 satisfy: W4≥1 / 2W1+5mm; and / or L3≥1 / 2L1+5mm.

11. The battery according to claim 1, characterized in that Hot melt adhesive is provided in the shell, and in the thickness direction of the battery, the projection of the explosion-proof sheet and the projection of the hot melt adhesive at least partially overlap.

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