CN221080259U - Explosion-proof nick has battery case, secondary cell and consumer of breach - Google Patents

Abstract

The utility model relates to a battery shell with a notch in an explosion-proof notch, a secondary battery and electric equipment, wherein the battery shell comprises a shell, the explosion-proof notch is arranged on the outer surface or the inner surface of the shell, the shape of the explosion-proof notch is a curve with the notch formed by cutting off a section of the closed curve, and the linear width of the notch is 0.1-80 mm. According to the utility model, the explosion-proof nicks are directly etched on the shell, so that the explosion-proof effect of the explosion-proof structure is prevented from being influenced due to poor welding effect; the curve with the notch is adopted as the shape of the explosion-proof notch, and the explosion-proof notch can be conveniently formed by adopting a laser etching mode.

Description

Explosion-proof nick has battery case, secondary cell and consumer of breach

Technical Field

The utility model belongs to the technical field of secondary batteries, and relates to a battery shell with a notch in an explosion-proof notch, a secondary battery and electric equipment.

Background

At present, new energy automobiles and electric automobiles become a new development trend of the automobile industry; the secondary battery is also widely applied to the field of new energy sources as a power source of equipment such as pure electric vehicles, plug-in hybrid electric vehicles, electric bicycles and the like. At present, most of secondary batteries adopt lithium batteries packaged by an aluminum shell, a pressure relief hole is generally formed in a top cover of the battery, and an explosion-proof valve is welded at the pressure relief hole so as to release internal pressure when the internal pressure of the battery is large, so that safety accidents such as explosion and the like of the battery are prevented. However, when the pressure in the battery is changed and the pressure is too large, if the stability of the explosion-proof valve welded on the top cover is insufficient, the whole explosion-proof valve is easily flushed during pressure relief, thereby damaging the safety of the battery and the whole battery system. In addition, the conventional method requires to open holes in the top cover and separately manufacture the explosion-proof valve, and requires high-precision laser welding equipment, the welding requires sealing and cannot burn through the thinner explosion-proof valve, the explosion-proof valve also requires separately punching scores, the material of the explosion-proof valve still depends on an inlet, the cost is high, and the integrity of a battery shell is not facilitated.

Disclosure of utility model

Aiming at the defects in the prior art, the utility model aims to solve the technical problems that: a battery case, a secondary battery and electric equipment with an explosion-proof notch are provided.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

The battery shell with the notch in the explosion-proof notch comprises a shell, wherein the explosion-proof notch is arranged on the outer surface or the inner surface of the shell, the shape of the explosion-proof notch is a curve with the notch formed by cutting off a section of the closed curve, and the linear width of the notch is 0.1-80 mm.

Further, the ratio of the thickness of the shell to the score residual value of the explosion-proof score is 1.1-30; the closed curve is a quasi-circular curve.

Further, the shape of the explosion-proof nick is a circular arc, the diameter of the circular arc is 5 mm-80 mm, and the radian of the circular arc is 30-355 degrees.

Further, the ratio of the thickness of the shell to the score residual value of the explosion-proof score is 1.5-10; the diameter of the circular arc is 10-18 mm, and the radian of the circular arc is 180-330 degrees.

Further, the shell is a cuboid and comprises a top surface, a bottom surface opposite to the top surface, two wide side surfaces and two narrow side surfaces, and the explosion-proof nicks are etched on the narrow side surfaces and/or the bottom surface; the anti-explosion nick is in the shape of an arc or an elliptical arc, and a notch of the arc or the elliptical arc faces the long side direction of the narrow side surface or the bottom surface.

Further, the shape of the explosion-proof nick is an ellipse with a notch, and the distance between two focuses of the ellipse is 5 mm-80 mm; the difference between the length of the major axis of the ellipse and the distance between the two focuses of the ellipse is 5 mm-80 mm, and the difference is smaller than or equal to the distance between the two focuses of the ellipse; the center point of the notch is located on the long axis of the ellipse.

Further, the shape of the explosion-proof nick is a runway shape with a nick, and the explosion-proof nick comprises two semicircular nicks which are symmetrically arranged and two straight-line section nicks which are connected with corresponding endpoints of the two semicircular nicks, wherein the diameter of the circle is 5 mm-80 mm, and the length of the straight-line section nick is 5 mm-80 mm; the center point of the notch is positioned on a straight line connecting the circle centers of the two semicircular scores.

Further, the straight line width of the notch is 1 mm-5 mm.

Further, the shell is made of stainless steel materials or aluminum alloy materials.

A secondary battery includes a battery case having an explosion-proof score with a notch.

An electrical device includes a secondary battery.

According to the utility model, the explosion-proof notch is directly etched on the cuboid shell, so that the explosion-proof structure and the shell are integrated, and the explosion-proof effect of the explosion-proof structure is prevented from being influenced by poor welding effect. Through setting up the thickness of casing and the ratio of nick residual value, can ensure that explosion-proof nick can in time tear open in order to release the inside high-pressure gas of casing when the inside atmospheric pressure of casing reaches predetermined atmospheric pressure value range, prevent that the battery from exploding, ensure producer and user's personal safety. The curve with the notch is adopted as the shape of the explosion-proof notch, and the explosion-proof notch can be conveniently formed by adopting a laser etching mode.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

Fig. 1 and 2 are schematic structural views of an embodiment of a battery case with an explosion-proof notch according to the present utility model.

Fig. 3 is a schematic structural view of a circular explosion-proof score with a notch.

Fig. 4 is a schematic structural view of an oval explosion-proof score with a notch.

Fig. 5 is a schematic view of a racetrack-shaped explosion-proof score with notches.

Fig. 6 is a schematic cross-sectional view of an explosion vent.

The meaning of the reference numerals in the drawings are:

A housing-100; a top surface-111; a bottom surface-112; wide side-121; narrow sides-131; explosion-proof nick-200; notch-201; semicircular scores-211, 212; straight line segment scores-221, 222.

Detailed Description

The following description of the embodiments of the utility model is given by way of specific examples, the illustrations provided in the following examples merely illustrate the basic idea of the utility model, and the following examples and features of the examples can be combined with one another without conflict.

Referring to fig. 1 and 2, an embodiment of a battery case with an explosion-proof score having a notch according to the present utility model includes a case 100, and an explosion-proof score 200 is provided on an outer surface or an inner surface of the case 100, thereby forming an explosion-proof structure. In this embodiment, the housing 100 is made of a stainless steel material, and the thickness of the stainless steel material may be 0.05mm to 0.8mm, and the housing 100 is made of a stainless steel material with a thickness ranging from 0.1mm to 0.3mm, where the thickness of the stainless steel material housing 100 is 0.20mm±0.005mm. Of course, the housing 100 may be made of an aluminum alloy material, and when an aluminum alloy material is used, the thickness of the aluminum alloy material may be 0.2mm to 1.5mm, and an aluminum alloy material having a thickness of 0.5mm is generally selected to make the housing 100. The case 100 of the secondary battery in the related art is generally made of an aluminum alloy material, and is made of a thicker aluminum alloy material because the aluminum alloy material is relatively soft. When the explosion-proof scores 200 are formed on the case 100 of the aluminum alloy material, a groove is generally formed in advance in the region of the explosion-proof scores 200 by punching or the like to thin the thickness of the region, and then the explosion-proof scores 200 are formed in the groove. In the case that the strength requirements of the case 100 of the battery are the same, the case 100 made of the stainless steel material may be made of a thinner material than the case 100 made of the aluminum alloy material, so that the explosion-proof score 200 may be directly formed on the case 100 without first punching a groove in the case 100. For example, the thickness of the stainless steel material housing 100 in this embodiment is 0.20mm±0.005mm, which is much smaller than the thickness of 0.5mm commonly used when the housing 100 is made of an aluminum alloy material.

When the cell inside the battery is damaged, a large amount of heat is emitted and/or gas is released, so that the pressure inside the casing 100 expands rapidly, and if the pressure is not released in time, when the air pressure inside the casing 100 is too high, the risk of explosion occurs. In this embodiment, if the air pressure in the casing 100 is too high, the explosion-proof notch 200 will be torn off under the action of high air pressure as the air pressure increases, so that the air in the casing 100 is discharged from the torn-off position of the explosion-proof notch 200, thereby releasing the high-pressure air in the casing 100, preventing the explosion of the battery and guaranteeing the personal safety of the producer and the user. The air pressure value at which the explosion-proof notch 200 is torn is the tearing air pressure value of the explosion-proof structure. In addition, since the explosion-proof notch 200 is directly etched on the casing 100 to form the explosion-proof structure in the embodiment, the explosion-proof structure and the casing 100 are integrated, compared with the prior art in which the pressure relief hole is formed and the explosion-proof valve is welded at the pressure relief hole, the process is simpler, the welding process is not needed, and the explosion-proof effect affecting the explosion-proof structure due to poor effect of the welding process is avoided.

In this embodiment, the housing 100 is a rectangular parallelepiped with a sheet shape, and includes a top surface 111, a bottom surface 112 opposite to the top surface 111, two wide side surfaces 121 opposite to each other, and two narrow side surfaces 131 opposite to each other. The case 100 of this shape can be used for the production of a blade battery, a square battery, etc., and since the two wide sides 121 are closely adhered to the batteries adjacent to both sides during the installation of the aforementioned batteries, respectively, the explosion-proof scores 200 are prevented from being torn, the explosion-proof scores 200 are not generally provided on the two wide sides 121 of the case 100. In addition, the top surface 111 of the case 100 is typically a top cover plate of a battery, and the electrode and other components are provided thereon, so that the area for providing the explosion-proof score 200 is small, and the explosion-proof score 200 is prevented from being provided on the top surface 111. Thus, the vent score 200 is typically disposed on one of the narrow sides 131 or the bottom 112. It is not excluded to press the anti-explosion notch 200 on the top cover plate, if the anti-explosion notch is disposed on the top cover plate, the volume of the product to be processed can be reduced, and the dual requirements of the punching device on the size and the precision can be reduced.

Because the housing 100 of the blade battery is long, considering that when a certain cell fails, there may be a large difference in air pressure in different areas of the housing, the location of the failed cell may also affect the explosion-proof effect of the explosion-proof structure if it is too far from the explosion-proof score 200. Accordingly, the explosion proof score 200 is provided on the narrow side 131 in this embodiment. The number of the explosion-proof scores 200 may be more than one, and may be determined specifically according to the length of the case 100 (i.e., the length of the case 100 in the z-axis direction in fig. 1 and 2). Generally, an explosion-proof structure formed by explosion-proof scores 200 is provided every 300mm in the length direction of the casing 100, and only one explosion-proof score 200 is provided for the casing 100 with the length of not more than 600 mm. If the length of the case 100 is greater than 600mm, each 300mm is increased by one explosion-proof notch 200, and each explosion-proof notch 200 is uniformly arranged along the length direction of the case 100, so that the explosion-proof notch 200 is arranged in a relatively close range when any part of the battery cells fail, and the explosion-proof notch 200 can be normally torn to discharge the expanded gas in the case 100 when the gas pressure in the case 100 reaches the tearing gas pressure value, thereby preventing the explosion of the battery.

The explosion-proof nick 200 is formed by laser etching; the laser etching is to utilize high-energy laser beam to irradiate the surface of the etched workpiece to melt and gasify the workpiece to form a groove with a certain depth, so as to realize the purpose of etching the material. The laser etching has the characteristics of high precision, small width of the notch, high etching yield, high stability, no consumable, no pollution and low cost. In the prior art, the explosion-proof notch 200 of the aluminum alloy shell is generally formed by adopting a stamping mode, and limited by a stamping process, the existing machine cannot meet requirements of machining size and high precision, high-precision stamping equipment with extremely large purchase or input quantity is required, the manufacturing cost is extremely high, the depth of the formed explosion-proof notch 200 cannot be accurately controlled by the existing stamping equipment, and the cross section width (namely the groove width) of the explosion-proof notch 200 is generally wider. The depth and width of the scores can be precisely controlled by forming the explosion-proof scores 200 through laser etching, so that the groove width of the explosion-proof scores 200 can be greatly reduced.

The shape of the anti-explosion notch 200 may be a closed curve which does not form a sharp included angle, such as a quasi-circular curve, a spline curve, etc. For example: the shape of the anti-explosion notch 200 can be a closed circular curve such as a circle, an ellipse or a runway, of course, the shape of the anti-explosion notch 200 can also be a hyperbola, a skip tongue line, a parabola or other curves. The use of a rounded-like curve or spline for the vent score 200 avoids the inclusion of sharp angles in the shape of the vent score 200, thereby facilitating laser etching. If the shape of the explosion-proof notch 200 includes a sharp included angle, the laser irradiation position of the laser etching apparatus cannot turn along the sharp included angle at the previous moving speed, and the stay needs to occur at the corner point of the included angle, and then the direction is changed to complete turning, so that the overall time of laser etching can be increased. In addition, when the laser irradiation position stays at the corner point, the laser is also required to be turned off temporarily to avoid excessive etching depth at the corner point, and the laser is turned on again after the direction is changed, so that the control process of the laser equipment is increased. In the embodiment, the explosion-proof nick 200 adopts a quasi-circular curve, and no sharp included angle is formed on the curve because the quasi-circular curve is an integrally smooth curve; when the laser etching explosion-proof notch 200 is used, the laser irradiation position of the laser etching equipment can be conveniently moved at a constant speed, and the phenomenon that the whole etching process time is increased due to the fact that the laser irradiation position stays at the corner point of an included angle due to turning is avoided.

When the shape of the explosion-proof notch 200 is a closed curve, the situation that the starting point and the ending point of each etching coincide occurs when the laser is used to etch the explosion-proof notch 200. Under normal conditions, the starting point and the end point are etched in each etching period, so that each etching period etches 2 times at the starting point (end point) of the etching, thereby increasing the etching depth at the position and possibly leading to the situation that the position is etched through. To avoid this, a curve with a notch 201 is generally selected as the shape of the explosion-proof score 200.

For example: the shape of the explosion-proof nick can be a curve with a notch formed by cutting a section on a closed curve, and the value range of the straight line width W3 of the notch 201 can be 0.1 mm-80 mm. For example, a curve with a notch 201 may be formed by cutting a section of the closed curve, and the curve with the notch 201 is used as the shape of the anti-explosion notch 200, so that the situation that the starting point and the ending point of etching coincide can be avoided, and the depths of the anti-explosion notches 200 are equal everywhere. Since laser etching is not required at the notch 201, the time of laser etching can also be shortened by forming the notch 201 on the explosion-proof score 200. For the same closed curve, the longer the length of the cut-off curve at the notch 201 is, the shorter the time required for laser etching is, and of course, if the length of the cut-off curve at the notch 201 is too long, the tearing air pressure value of the explosion-proof structure is increased. In order to avoid the influence of overlong cut-off curve length at the notch 201 on the tearing air pressure value of the explosion-proof structure, and simultaneously to minimize the time required by laser etching, the notch 201 is generally formed by cutting off only a small section of curve of the closed curve, and the linear width at the notch 201 is generally 1mm less than or equal to W3 less than or equal to 5mm, in the range, the linear width of the notch 201 hardly influences the tearing air pressure value of the explosion-proof structure. Of course, when the linear width W3 of the notch 201 is larger, the tearing air pressure value of the explosion-proof structure may be increased, and the tearing air pressure value of the explosion-proof structure may be reduced by changing other parameters of the explosion-proof notch 200. In addition, by leaving the notch 201 on the explosion-proof notch 200 without etching, when the explosion-proof notch 200 is torn due to the expansion of the gas inside the shell caused by the heat generation of the battery cell, the notch 201 is of normal thickness and cannot be torn, so that the connection between the area enclosed by the explosion-proof notch 200 and the shell 100 can be ensured, and the secondary damage to other battery cells or water-cooled plates and peripheral connection circuits caused by the fact that the area enclosed by the explosion-proof notch 200 is torn integrally and is flushed by high pressure can be avoided.

Referring to fig. 3, the shape of the explosion-proof notch 200 is a circular shape with a notch 201. The diameter D1 of the circle is in the range of 5mm to 80mm, preferably 10 mm.ltoreq.d1.ltoreq.18 mm, and d1=15 mm may be taken, for example. In the figure, the length of the notch 201 is 2mm, the notch 201 may be disposed at any position of the circle, and the notch 201 faces the length direction of the rectangular surface where the explosion-proof notch 200 is located (i.e., when the explosion-proof notch 200 is disposed on the narrow side 131 of the case 100, the notch 201 faces the z-axis direction of fig. 1 and 2, and when the explosion-proof notch 200 is disposed on the bottom 112 of the case 100, the notch 201 faces the x-axis direction of fig. 1 and 2).

Referring to fig. 4, a schematic structural view of the explosion-proof notch 200 when the shape is an ellipse with a notch 201 is shown. The major axis of the ellipse coincides with the length direction of the housing 100 (i.e., the major axis of the ellipse is parallel to the z-axis of the coordinate system of fig. 1 and 2). The distance L1 between two focuses of the ellipse is more than or equal to 5mm and less than or equal to 80mm, and is preferably more than or equal to 25mm and less than or equal to 50mm, and L1 is less than or equal to 80 mm. The difference between the length L2 of the major axis of the ellipse and the distance L1 between the two focuses of the ellipse is 5mm less than or equal to (L2-L1) less than or equal to 80mm, and the value of (L2-L1) is less than or equal to the value of L1, preferably 10mm less than or equal to (L2-L1) less than or equal to 18mm; for example, l1=35 mm and l2—l1=15 mm may be taken. In the figure, the length of the notch 201 is 2mm, and the notch 201 is preferably disposed at one end point of the major axis of the ellipse.

Referring to fig. 5, the explosion-proof score 200 is a track-shaped score with a notch 201. The explosion-proof notch 200 includes a semicircular notch 211 and a semicircular notch 212 which are symmetrically arranged, and two straight-line segment notches (221, 222) connecting corresponding ends of the semicircular notch 211 and the semicircular notch 212. Wherein, straight line segment score 221 is used for connecting a pair of endpoints corresponding to semi-arc score 211 and semi-arc score 212, and straight line segment score 222 is used for connecting another pair of endpoints corresponding to semi-arc score 211 and semi-arc score 212. The direction of the linear segment score 221 and the linear segment score 222 coincides with the length direction of the case 100 (i.e., the linear segment score 221 and the linear segment score 222 are parallel to the z-axis of the coordinate system in fig. 1 and 2). The diameter D2 of the semicircular scores 211 and 212 is in the range of 5 mm-80 mm, preferably 10 mm-18 mm and D2 is less than or equal to 10 mm; the length L3 of the straight line section nick 221 and the straight line section nick 222 is more than or equal to 5mm and less than or equal to L3 and less than or equal to 80mm; for example, d2=15mm, l3=35 mm may be taken. In the figure, the length of the notch 201 is 2mm, and the notch 201 is preferably disposed at the midpoint of the semicircular arc notch 211 or the semicircular arc notch 212.

When the ratio of the notch 201 to the closed curve is large, the actual shape of the notch cannot be expressed accurately by the notch length, and in this case, the shape of the notch may be expressed by the ratio of the length of the closed curve to the length of the cut-off portion, and the ratio of the length of the closed curve to the length of the cut-off portion may be in the range of 12/11 to 72. Taking a closed curve shape as an example, the shape of the explosion-proof notch 200 after forming the notch 201 is an arc of 30 ° to 355 °. In general, the ratio of the length of the closed curve to the length of the cut-off portion is 2 to 12, that is, the explosion-proof score 200 generally takes the shape of an arc of 180 ° to 330 °, preferably 270 °. Of course, the explosion-proof score 200 may be an arc with an arc degree θ of 60 °, 90 °, 120 °, or 150 °. In the same situation, when the explosion prevention score 200 is in the shape of an arc with an arc degree θ smaller than 90 °, the air pressure required for tearing the explosion prevention score 200 will be significantly increased, when the explosion prevention score 200 is in the shape of an arc with an arc degree θ between 90 ° and 180 °, the air pressure required for tearing the explosion prevention score 200 will be significantly decreased with the increase of the arc degree θ of the arc, and when the explosion prevention score 200 is in the shape of an arc with an arc degree θ larger than 180 °, the air pressure required for tearing the explosion prevention score 200 will be less changed with the arc degree θ of the arc.

The value of the tear gas pressure at the vent score 200 is primarily affected by the score residual T of the vent score 200 and the thickness T of the housing 100. The thickness of the case 100 refers to the wall thickness of the case 100, that is, the thickness of the material used to manufacture the case 100, and not the thickness of the entire battery case. Referring to fig. 6, a score residual of the explosion proof score 200 is defined as a thickness of the case 100 remaining after the explosion proof score 200 is thinned. If the ratio T/T of the thickness T of the case 100 to the score residual T of the explosion-proof score 200 is large, the strength of the case 100 is greatly reduced, and when the battery collides with other products during use, the case 100 is highly likely to be broken, so that external gas enters the case 100 through the breaking port to chemically react with the material of the battery cell, thereby causing the battery to fail, and even possibly causing a battery explosion accident. If the ratio of T/T is small, when the internal air pressure of the battery reaches the upper limit air pressure, the pressure relief opening formed by tearing the explosion-proof notch 200 will be small, so that the gas in the battery cannot be discharged in time, and the battery may be excessively expanded to cause explosion.

In this embodiment, the ratio of the thickness T of the case 100 to the score residual T of the explosion-proof score 200 is 1.1.ltoreq.T/t.ltoreq.30, and the ratio of T/T is generally in the range of 1.5 to 10. For example: when the case 100 is made of a stainless steel material having a thickness of 0.05mm to 0.8mm under the condition that the ratio range of T/T is satisfied, the score residual T of the explosion-proof score 200 is generally 0.01mm to 0.3mm, preferably 0.01mm to 0.08mm. When the case 100 is made of an aluminum alloy material having a thickness of 0.2mm to 1.5mm, the score residual t of the explosion-proof score 200 is generally 0.05mm to 0.5mm, preferably 0.05mm to 0.2mm. In particular, in the present embodiment, when the case 100 is made of a stainless steel material with a thickness of 0.20mm±0.005mm, the score residual value t of the explosion-proof score 200 is generally set in the following range: t is more than or equal to 0.02mm and less than or equal to 0.08mm.

With continued reference to fig. 6, in this embodiment, the cross-sectional shape of the anti-explosion notch 200 is trapezoidal; the connecting part of the trapezoid waist and the lower bottom is of a round corner structure. Of course, in other embodiments, the cross-sectional shape of the anti-explosion score 200 may be V-shaped or U-shaped. The lower bottom width of the section of the explosion-proof notch 200 has a value within the range of 0-0.5 mm. When the cross-sectional shape of the explosion-proof notch 200 is a trapezoid, the included angle a between the waist of the trapezoid and the vertical direction (i.e. the height of the trapezoid) and the value of the width W1 of the bottom of the trapezoid will also have a certain influence on the tearing air pressure value of the explosion-proof structure. The included angle a between the waist of the trapezoid and the height of the trapezoid is within the range of 5-60 degrees; preferably 25 DEG.ltoreq.a.ltoreq.45 deg. The width W1 of the bottom of the trapezoid is preferably 0.03mm or more and W1 or less and 0.1mm or less.

In this embodiment, the stainless steel material case 100 with a thickness of 0.20mm±0.005mm is used, and the explosion-proof notch 200 with a trapezoid cross section and a circular shape with a notch 201 as the whole is used as the verification object, so that the influence of the ratio of the thickness T of the case 100 to the notch residual value T of the explosion-proof notch 200 on the explosion-proof effect is verified. Wherein, the shell 100 is in a cuboid shape, the explosion-proof nick 200 is arranged on the narrow side surface 131, the straight line width of the notch 201 is 2mm, the width W1 of the lower bottom of the trapezoid is 0.08mm, the included angle between the waist of the trapezoid and the height of the trapezoid is more than or equal to 25 degrees and less than or equal to 45 degrees, and the diameter of the circle is 15mm. Since the thickness of the stainless steel material case 100 is not easily changed, in the case that the thickness T of the stainless steel material case 100 is fixed, the ratio of T/T is changed by changing the score residual value T, and a plurality of times of verification is performed for each value of the score residual value T, and the verification data are shown in table 1:

TABLE 1

The pressing speed in the table is the speed at which the pressure is charged into the casing 100 during the test. Since the above verification is concerned only with the value of the tearing air pressure when the explosion-proof score 200 is torn, the process of the explosion of the case 100 is not simulated, and thus the time required for tearing the explosion-proof score 200 is not taken as a verification parameter.

In this embodiment, the stainless steel material housing 100 with a thickness of 0.20mm±0.005mm is used, and the explosion-proof notch 200 with a trapezoidal cross section and an arc overall shape is used as a verification object, so that the influence of the arc notch 201 on the explosion-proof effect in the direction of the length of the rectangular surface and in the direction of the width of the rectangular surface is verified. Wherein, the shell 100 is in a cuboid shape, the explosion-proof nick 200 is arranged on the narrow side surface 131, the nick residual value t is 0.08mm, the width W1 of the lower bottom of the trapezoid is 0.08mm, the included angle between the waist of the trapezoid and the height of the trapezoid is more than or equal to 25 degrees and less than or equal to 45 degrees, and the diameter of the circular arc is 15mm. The validation data are shown in table 2:

TABLE 2

As is clear from the verification data in table 2, the tearing air pressure of the circular arc notch 201 in the longitudinal direction of the rectangular surface is significantly smaller than the tearing air pressure of the circular arc notch 201 in the width direction of the rectangular surface.

In this embodiment, the stainless steel material housing 100 with a thickness of 0.20mm±0.005mm is also used, and the explosion-proof notch 200 with a trapezoid cross section and a circular overall shape with a notch 201 is used as a verification object, so that the influence of the diameter of the circular shape on the explosion-proof effect is verified. Wherein, the shell 100 is in a cuboid shape, the explosion-proof nick 200 is arranged on the narrow side surface 131, the straight line width of the notch 201 is 2mm, the width W1 of the lower bottom of the trapezoid is 0.08mm, the included angle between the waist of the trapezoid and the height of the trapezoid is more than or equal to 25 degrees and less than or equal to 45 degrees, and the nick residual value t is 0.04mm. Multiple verifications were made for each diameter, with the verification data shown in table 3:

TABLE 3 Table 3

The valve opening time in the table refers to the time required from the start of pressurization to the tearing of the explosion-proof score 200; since the verification and the subsequent verification are both simulations of the process of blasting the casing 100, a valve opening time parameter is added, and the valve opening time is more ideal in the range of 30s to 40 s.

In this embodiment, the stainless steel material housing 100 with a thickness of 0.20mm±0.005mm is also used, and the explosion-proof notch 200 with a trapezoid cross section, an arc of 120 ° overall shape and an arc diameter of 15mm is used as a verification object, so that the influence of the width W1 of the bottom of the trapezoid on the explosion-proof effect is verified. Wherein the shell 100 is in a cuboid shape, the explosion-proof notch 200 is arranged on the narrow side face 131, the notch residual value t is 0.04mm, and the included angle between the waist of the trapezoid and the height of the trapezoid is 25 degrees or more and less than or equal to 45 degrees. Multiple verifications were made for each trapezoidal bottom width W1, with verification data as shown in table 4:

TABLE 4 Table 4

In this embodiment, the stainless steel shell 100 with a thickness of 0.20mm±0.005mm is further used, and the explosion-proof nick 200 with a trapezoid cross section and an arc overall shape is used as a verification object, so that the influence of the radian θ (the ratio of the length of the closed curve to the length of the cut-off portion) and the diameter of the arc on the explosion-proof effect are verified. Wherein the shell 100 is in a cuboid shape, the explosion-proof notch 200 is arranged on the narrow side face 131, the notch residual value t is 0.04mm, and the included angle between the waist of the trapezoid and the height of the trapezoid is 25 degrees or more and less than or equal to 45 degrees. The radian θ and diameter of each arc were verified multiple times, and the verification data are shown in table 5:

TABLE 5

In this embodiment, the explosion-proof structure is formed by directly etching the explosion-proof notch 200 on the rectangular casing 100, so that the explosion-proof structure and the casing 100 are integrated, and the explosion-proof effect of the explosion-proof structure due to poor welding effect is avoided. By setting the ratio of the thickness of the case to the score residual value within a predetermined range, it is possible to ensure that the explosion-proof score 200 is torn off in time when the air pressure inside the case 100 reaches the predetermined air pressure range, so that the air inside the case 100 is discharged from the torn-off position of the explosion-proof score 200, thereby releasing the high-pressure air inside the case 100, preventing the explosion of the battery, and ensuring the personal safety of the producer and the user. The shape of the explosion-proof notch 200 is a curve with a notch, so that the explosion-proof notch 200 can be conveniently formed by adopting a laser etching mode.

The utility model also discloses a secondary battery which can be a power battery or an energy storage battery, and the shell of the secondary battery can adopt the battery shell with the notch provided with the explosion-proof notch in any embodiment. Of course, the secondary battery further includes a battery cell housed in a battery case and other necessary structures for a conventional secondary battery, which are prior art and are not described herein.

The utility model also discloses electric equipment, which comprises the secondary battery in any embodiment, so as to supply power to the electric equipment through the secondary battery. For example, the electric equipment can be a new energy electric automobile or a hybrid electric automobile. It can be understood that the electric equipment can also be an electric tool, an energy storage device, a power device or other devices driven by electric power such as a mobile phone, a tablet personal computer, a computer, an unmanned aerial vehicle and the like.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the claims of the present utility model.

Claims (10)

1. An explosion-proof nick has a notched battery housing characterized in that: the anti-explosion device comprises a shell, wherein an anti-explosion notch is formed on the outer surface or the inner surface of the shell, the shape of the anti-explosion notch is a curve with a notch formed by cutting off a section of the closed curve, and the linear width of the notch is 0.1-80 mm; the shell is cuboid and comprises a top surface, a bottom surface opposite to the top surface, two wide side surfaces and two narrow side surfaces, the explosion-proof nicks are etched on the narrow side surfaces and/or the bottom surface, and the nicks face the length direction of the narrow side surfaces or the bottom surface.

2. The explosion-proof scored battery case with notches of claim 1, wherein: the ratio of the thickness of the shell to the notch residual value of the explosion-proof notch is 1.1-30; the closed curve is a quasi-circular curve.

3. The explosion-proof scored battery case with notches as set forth in claim 2, wherein: the anti-explosion nick is arc-shaped, the diameter of the arc is 5 mm-80 mm, and the radian of the arc is 30-355 degrees.

4. The explosion-proof scored battery case with notches of claim 3, wherein: the ratio of the thickness of the shell to the notch residual value of the explosion-proof notch is 1.5-10; the diameter of the circular arc is 10-18 mm, and the radian of the circular arc is 180-330 degrees.

5. The explosion-proof scored battery case with notches as set forth in claim 2, wherein: the shape of the explosion-proof nick is an ellipse with a notch, and the distance between two focuses of the ellipse is 5 mm-80 mm; the difference between the length of the major axis of the ellipse and the distance between the two focuses of the ellipse is 5 mm-80 mm, and the difference is smaller than or equal to the distance between the two focuses of the ellipse; the center point of the notch is located on the long axis of the ellipse.

6. The explosion-proof scored battery case with notches as set forth in claim 2, wherein: the explosion-proof nick is in a runway shape with a nick and comprises two semicircular nicks which are symmetrically arranged and two straight-line section nicks which are connected with corresponding endpoints of the two semicircular nicks, the diameter of the circle is 5 mm-80 mm, and the length of the straight-line section nick is 5 mm-80 mm; the center point of the notch is positioned on a straight line connecting the circle centers of the two semicircular scores.

7. The explosion-proof scored battery case with notches as in claim 5 or 6, wherein: the straight line width of the notch is 1 mm-5 mm.

8. The explosion-proof scored battery case with notches of claim 1, wherein: the shell is made of stainless steel materials or aluminum alloy materials.

9. A secondary battery characterized in that: a battery case comprising an explosion-proof score having a notch as claimed in any one of claims 1 to 8.

10. An electrical consumer, characterized in that: a secondary battery comprising the battery according to claim 9.