CN217848213U - Explosion-proof structure of battery - Google Patents

Abstract

The application is suitable for the technical field of battery safety protection, and particularly provides a battery explosion-proof structure which comprises a shell and an explosion-proof wire; the shell is used for accommodating the battery cell; the explosion-proof line is arranged on the inner surface and/or the outer surface of the shell, the explosion-proof line is a groove formed in the surface of the shell, the groove is a linear groove body extending on the surface of the shell, the surface where the explosion-proof line is located is an opening surface which is circular, regular polygon or rectangle, the opening surface is provided with a central point, the explosion-proof line passes through the central point of the opening surface, and the opening depth of the explosion-proof line is 40% -80% of the thickness of the shell. The technical problem that a battery explosion-proof wire cannot be opened when thermal runaway occurs in the prior art is solved.

Description

Explosion-proof structure of battery

Technical Field

The application relates to the technical field of battery safety protection, in particular to a battery explosion-proof structure.

Background

The lithium ion battery has the advantages of high energy density, long cycle life, environmental protection and the like, and is widely applied to the fields of wearing, digital code, energy storage, power and the like. The safety of the battery is always concerned, and the importance of the safety of the battery is particularly prominent for wearing products. In order to ensure the safety of the battery, battery manufacturers have taken numerous safety measures. The most common measure is to etch an explosion-proof wire on a battery, but the specifications and sizes of the explosion-proof wires of manufacturers are different at present, the pressure relief pressure of the battery is unknown, and the phenomenon that part of the explosion-proof wires of the product battery cannot be opened when thermal runaway occurs does not exist, so that an accurate explosion-proof wire etching scheme is not provided.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a battery explosion-proof structure, solves the battery explosion-proof line that exists among the prior art and can't open the technical problem when thermal runaway takes place.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: provided is a battery explosion-proof structure, characterized by comprising:

the battery comprises a shell, a battery core and a battery cover, wherein the shell is internally used for accommodating the battery core; and

the explosion-proof line is arranged on the inner surface and/or the outer surface of the shell, the explosion-proof line is a groove formed in the surface of the shell, the groove is a linear groove body extending on the surface of the shell, the surface where the explosion-proof line is located is a set surface, the set surface is circular, regular polygon or rectangular, the set surface is provided with a central point, the explosion-proof line passes through the central point of the set surface, and the set depth of the explosion-proof line is 40% -80% of the thickness of the shell.

In one embodiment, the opening depth of the explosion-proof line is 70% of the thickness of the shell.

In one embodiment, the explosion-proof line extends on the surface of the shell to form a circular arc shape, and the width of the groove is gradually increased from the groove bottom to the notch.

In one embodiment, the corresponding central angle of the explosion-proof line is 150-240 degrees.

In one embodiment, the corresponding central angle of the explosion-proof line is 180 degrees.

In one embodiment, the number of the explosion-proof lines is two, the two explosion-proof lines are tangent, and the tangent point is the central point.

In one embodiment, the central point is a midpoint of the two explosion-proof lines in the length direction.

In one embodiment, the radius of the circle where the explosion-proof line is located is 2.0mm-3.5mm.

In one embodiment, the radius of the circle where the explosion-proof line is located is 3.5mm.

In one embodiment, the shell is further provided with a reinforcing rib, the reinforcing rib is arranged on the opening surface, the arrangement extending shape of the reinforcing rib on the opening surface is matched with the arrangement extending shape of the explosion-proof wire on the opening surface, the distance between the reinforcing rib and the explosion-proof wire is 0.1mm-2mm, and the reinforcing rib is a stepped structure formed by stamping the shell and with one convex side and the other concave side.

The beneficial effects of the battery explosion-proof structure that this explosion-proof structure has set up the explosion-proof line, wherein the specific setting depth of explosion-proof line accounts for 40% -80% of casing thickness, in this degree of depth accounts for the within range, can guarantee that the explosion-proof line plays and splits before the casing, avoid the casing to explode, play the effect of pressure release in advance, if account for less than 40%, then explosion-proof line intensity is great, can not split easily, can not play the pressure release effect like this, if account for more than 80%, then in-process at transportation etc. because factors such as collision may lead to the explosion-proof line to split, also do not accord with operation requirement this moment, so 40% -80% of explosion-proof line depth that this application provided accounts for casing thickness belongs to the range of ideal, can guarantee effectively that the explosion-proof line splits the effect of pressure release in advance, prevent the accident of battery explosion from taking place, and the explosion-proof line passes through the central point of face, can reduce explosion-proof line's intensity that splits to a certain extent, make it easy.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a housing of a battery explosion-proof structure provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of an arrangement form of an explosion-proof line and a reinforcing rib in an explosion-proof structure of a battery provided in an embodiment of the present application;

FIG. 3 isbase:Sub>A schematic view of the structure of FIG. 2 taken along line A-A;

FIG. 4 is a schematic structural diagram of an explosion-proof line arrangement according to another embodiment of the present application;

FIG. 5 is a schematic structural diagram of an explosion-proof line arrangement according to yet another embodiment of the present application;

FIG. 6 is a schematic structural diagram of an explosion-proof line configuration according to yet another embodiment of the present application;

FIG. 7 is a graph showing the relationship between the ratio of the depth of the explosion-proof line to the thickness of the shell and the pressure relief pressure;

FIG. 8 is a graph showing the relationship between the central angle and the pressure relief pressure corresponding to the explosion-proof line;

fig. 9 is a graph showing the relationship between the radius of the circle on which the explosion-proof line is located and the pressure relief pressure.

In the figure, 1, a housing; 2. explosion-proof wire; 3. reinforcing ribs; 4. a center point; 5. an upper cover; 6. a lower cover; 7. a side wall.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present application, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.

In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Referring to fig. 1, 2 and 3, the present application provides an embodiment of a battery explosion-proof structure, which includes a housing 1 and an explosion-proof wire 2; the battery of the application can be a lithium battery, a sodium battery and a zinc battery.

The shell 1 is a structure with an inner cavity, and the inner cavity is used for accommodating the battery core; the shell 1 is used for accommodating the battery cell so as to protect the battery cell, the inner cavity of the shell 1 is a relatively closed space, so that the influence of the outside on the working environment of the battery cell can be prevented, and meanwhile, when the battery cell is out of control thermally and expands, the shell 1 can bear certain pressure;

the material that casing 1 can adopt is selected according to specific needs, can be steel casing, plastic-aluminum membrane shell, aluminum alloy shell, aluminum hull etc. can select the different materials of resistance to compression according to the pressure intensity that its needs bore.

In order to prevent the explosion of the shell 1 after the limit bearing strength is exceeded, the explosion-proof line 2 is provided, and the explosion-proof line 2 can be arranged on the inner surface and/or the outer surface of the shell 1, and generally, the explosion-proof line 2 is arranged on the outer surface of the shell 1 for convenience of arrangement.

The explosion-proof line 2 is a groove formed in the surface of the shell 1, the groove is a linear groove body extending on the surface of the shell 1, the surface where the explosion-proof line 2 is located is a set surface, the set surface is circular, regular polygon or rectangular, the set surface is provided with a central point 4, the explosion-proof line 2 passes through the central point 4 of the set surface, and the set depth of the explosion-proof line 2 is 40% -80% of the thickness of the shell 1.

Specifically, explosion-proof line 2 is the recess that has certain degree of depth for the sculpture on casing 1 surface to this recess extends along casing 1's surface, forms the cell body of line form, is called the line form cell body, so call explosion-proof line 2, because the recess has certain degree of depth, so reduced casing 1's thickness relatively, reduced casing 1's intensity, can produce earlier than casing 1 and break, thereby reach the effect of pressure release.

By a linear channel, the groove extends along the length of the linear channel.

The housing 1 used in this embodiment is a circular or regular polygonal or rectangular housing having at least one open face with a center point 4.

When the opening surface is a circle, the central point 4 is a central point, when the opening surface is a rectangle, the central point 4 is an intersection point of two diagonal lines, and when the opening surface is a regular polygon, the central point 4 is a center of an inscribed circle or an circumscribed circle. The centre point 4 can be defined as the point which is equidistant from the perpendicular to the sides of the opening face (in the case of a circle, the distance is the length of the radius) or from the line connecting the end corners of the opening face.

The central point 4 is far away from the break angle of the shell 1, the strength is relatively low, and the explosion-proof line 2 passes through the central point 4, so that the strength of the shell 1 is further reduced, the rupture and the pressure relief are facilitated, and the opening depth of the explosion-proof line 2 provided by the embodiment is 40% -80% of the thickness of the shell 1 and is correspondingly set based on the condition that the explosion-proof line 2 passes through the central point 4.

Specifically, the casing 1 provided in this embodiment may be cylindrical, preferably cylindrical, or may be a columnar structure with a polygonal cross section, such as a special-shaped battery or a rectangular parallelepiped, and if the casing is a special-shaped battery, at least one surface of the casing needs to have the central point 4.

As shown in fig. 1-3, the preferred housing of this embodiment is cylindrical, and when cylindrical, includes an upper cover 5, a sidewall 7, and a lower cover 6. The side wall 7 and the lower cover 6 are of an integral structure and are obtained by stamping steel. The connection between the upper cover 5 and the side wall 7 may be laser welded or may be mechanically riveted. The explosion-proof wire is generally arranged on the upper cover 5 or the lower cover 6, so that pressure relief is facilitated.

Therefore, the battery explosion-proof structure provided by the application has the beneficial effects that the explosion-proof structure is provided with the explosion-proof wire 2, wherein the specific setting depth of the explosion-proof wire 2 accounts for 40% -80% of the thickness of the shell 1, and in the range of the depth, the explosion-proof wire 2 can be ensured to crack before the shell 1, so that the explosion of the shell 1 is avoided, and the effect of pressure relief in advance is achieved, if the depth is less than 40%, the explosion-proof wire 2 has higher strength and cannot crack easily, so that the pressure relief effect cannot be achieved, when the depth is more than 80%, the explosion-proof wire 2 can be caused to crack due to factors such as collision and the like in the process of failing to achieve the pressure relief pressure or transportation, and the use requirement is not met at this moment, so that the depth of the explosion-proof wire 2 accounts for 40% -80% of the thickness of the shell 1, the effect of pressure relief and cracking of the explosion-proof wire 2 in advance can be effectively ensured, and the accident of battery explosion can be prevented, and the explosion-proof wire 2 passes through the central point 4 provided with the surface, and the strength of the explosion-proof wire 2 can be reduced to a certain extent, and the center point can be easy to crack.

As a preferable embodiment of the explosion-proof structure of the battery provided in this embodiment, the opening depth of the explosion-proof line 2 is 70% of the thickness of the case 1.

The embodiment provides an optimal opening depth ratio of 70%, namely the depth of the explosion-proof line 2 is 70% of the whole thickness of the shell 1, and under the ratio, the explosion-proof line can not only be cracked under certain pressure, but also be prevented from being cracked under daily collision, and the effect is good.

As shown in fig. 7, a relationship diagram of the pressure relief pressure and the depth of the explosion-proof line 2 is shown under the condition that other parameters affecting the pressure relief pressure are fixed (for example, the material, strength, and wiring of the explosion-proof line), as can be seen from fig. 7, when the pressure relief pressure is greater than 80%, the pressure relief pressure is significantly reduced, which is not practical, because the internal pressure of the housing 1 is slightly increased, the explosion-proof line 2 is broken, unless the housing 1 is made of a material with a particularly high strength, which causes an increase in cost, it must be lower than 80%, the pressure relief pressure is increased along with the reduction of the ratio, but cannot be too low, which is greater than 40%, and if the pressure relief pressure is less than 40%, the pressure relief pressure is too high, which cannot achieve a good pressure relief, and it is necessary to change other parameter conditions, for example, the strength of the housing 1 must be greatly reduced, which is not practical, which causes the collision damage of the housing 1, so 40% -80% selected in this embodiment is a more ideal range. So 40% -80% provided by this embodiment is the best choice to meet the conventional setup.

It should be noted that the pressure relief pressure value shown on the Y axis in fig. 7 is not fixed, but when other parameters are changed, for example, when the strength of the case 1 is increased or the wiring of the explosion-proof wire 2 is decreased, the pressure relief pressure is correspondingly increased, and when the wiring of the explosion-proof wire 2 with decreased strength is increased, the case 1 with proper material and proper strength can be selected according to specific needs, etc., and fig. 7 is only for showing the trend of the change relationship between the depth ratio and the pressure relief pressure. In order to ensure the pressure relief effect and prevent the pressure relief pressure from being too small, the explosion-proof line 2 is adopted in the embodiment, and the depth of the explosion-proof line 2 accounts for 40-80% of the thickness of the shell 1, and is preferably 70%.

As shown in fig. 2 and 3, as a preferred embodiment of the explosion-proof structure of the battery provided in this embodiment, the explosion-proof line 2 extends on the surface of the housing 1 to form a circular arc shape, and the width of the groove gradually increases from the groove bottom to the notch.

In particular, the explosion-proof line 2 extends on the surface of the housing 1, preferably in the shape of a circular arc, because the arc has a greater length for the same area, and conversely, the arc has a smaller area for the same length of the explosion-proof line 2.

Moreover, the width of the groove is gradually increased from the groove bottom to the notch, and particularly, the groove body with the U-shaped or V-shaped section can be used.

Further, the embodiment also provides that when the explosion-proof line 2 is in the shape of a circular arc, the central angle corresponding to the explosion-proof line 2 is preferably 150-240 °. Of which 180 is preferred.

Specifically, in the present embodiment, the central angle is selected to be 150 ° to 240 °, as shown in fig. 8, the corresponding relationship between the pressure relief pressure of the explosion-proof wire 2 and the central angle is that the pressure relief pressure is the smallest at 180 °, and the pressure relief pressure gradually increases from 180 ° to 300 °, and the pressure relief pressure gradually decreases from 150 ° to 180 °. Therefore, the pressure relief pressure is small at 150-240 degrees, the pressure relief effect can be further ensured, and the explosion-proof wire 2 is easy to crack.

Similarly, the pressure relief value shown on the Y axis in fig. 8 is not fixed, and when other parameters affecting the pressure relief pressure are changed, it will also correspondingly rise or fall, for example, when the central angle is 150 ° to 240 °, if the strength of the casing 1 is greater, the pressure relief pressure corresponding to the Y axis will also increase, and when the strength of the casing 1 is smaller, the pressure relief pressure corresponding to the Y axis will decrease, and other parameters may be optionally set as required, but the change trend is unchanged, so this embodiment selects 150 ° to 240 °. Wherein preferred 180, the pressure release pressure that corresponds this moment is less, and easy explosion-proof line 2 splits, guarantees the pressure release effect.

Specifically, the reason why the central angle of 150 ° to 240 ° is selected in the present embodiment is that the pressure relief pressure is generally expected to be 1.5 to 2.5MPa in the conventional battery, and in fig. 8, the conventional setting is selected for other parameter conditions such as the strength of the housing 1, and it can be known from fig. 8 that the central angle of 150 ° to 240 ° selected in the present embodiment can make the pressure relief pressure within the range of 1.5 to 2.5MPa, so as to meet the use requirement of the conventional battery.

The 150-240 selected for this embodiment is the most suitable angle selected for the conventional arrangement for the most widely used conventional batteries.

Fig. 7 and 8 are graphs showing the corresponding relationship among the depth ratio, the central angle and the pressure relief pressure, respectively, when other parameter conditions are changed, the pressure relief pressure value of the Y axis in the two graphs can be correspondingly changed, and both the two graphs select a numerical interval corresponding to the lower pressure relief pressure, and the pressure relief pressure in the numerical interval can not be too low, so that the effect is better, and the pressure relief effect can be ensured. It should be noted that the pressure relief pressure corresponding to the depth ratio of 40% to 80% in fig. 7 is not in the range of 1.5-2.5MPa, because other conditions affecting the pressure relief pressure, such as the strength of the housing, may be selected greatly, and when other conditions are changed, for example, when all the conditions are set conventionally, the value of the Y axis corresponding to the depth ratio of 40% to 80% is in the range of 1.5-2.5MPa, and fig. 7 only shows the change trend.

As shown in fig. 2, in this embodiment, it is preferable that two explosion-proof lines 2 are adopted, and two explosion-proof lines 2 are tangent, and the tangent point is the central point 4.

Specifically, this embodiment adopts two explosion-proof lines 2, has further reduced 1 intensity of casing, has guaranteed its pressure release effect to two explosion-proof lines 2 all adopt arc, and can all adopt the central angle to be 180 degrees arc, and two explosion-proof lines 2 are tangent, and the tangent point is located central point 4, makes two explosion-proof lines 2 all through central point 4 like this, can further reduce pressure release pressure.

It should be noted that all embodiments adopted in the present embodiment that can further reduce the pressure relief pressure can ensure that the pressure relief pressure is within a reasonable interval, usually 1.5-2.5MPa, in order to ensure the pressure relief effect within a reasonable interval, and not to make the pressure relief pressure too small, because too small, it may break when the pressure relief is not needed, or break due to collision, which are all undesirable.

Further, the central point 4 is the middle point of the two explosion-proof lines 2 in the length direction. With central point 4 setting at the mid point on explosion-proof line 2 length direction, played the effect of symmetry, it is more pleasing to the eye to make explosion-proof line 2 can be effectively be in the position placed in the middle of seting up the face, guarantee the pressure release effect.

The embodiment also provides another preferable embodiment of the explosion-proof wire 2, namely the radius parameter of the circle where the circular arc is located when the explosion-proof wire 2 adopts the circular arc shape, and the radius of the circle where the explosion-proof wire 2 is located is 2.0mm-3.5mm. Preferably 3.5mm.

Similar to the selection manner of the central angle, as shown in fig. 9, the present embodiment provides a relationship diagram corresponding to the radius and the pressure relief pressure, specifically, under the condition that other parameter conditions are fixed, along with the change of the radius, the change diagram of the pressure relief pressure is also provided, that is, along with the increase of the radius, the pressure relief pressure is smaller, so that the radius with the smaller pressure relief pressure is selected to be 2.0mm to 3.5mm, preferably 3.5mm, so that the pressure relief effect can be ensured, and the explosion-proof line 2 can be smoothly cracked.

Also, as shown in fig. 9, the pressure relief pressure of the conventional battery is expected to be 1.5-2.5MPa, and under the condition that other parameter conditions such as the strength of the housing 1 and the like are selected to be conventionally set, the radius of 2.0mm-3.5mm selected by the embodiment can enable the pressure relief pressure to be in the range of 1.5-2.5MPa, so that the use requirement of the conventional battery is met.

However, considering the limitation of the cell diameter, the radius cannot be too large, so the radius is selected to be 2.0mm-3.5mm, so only the corresponding pressure relief pressure value at the radius of 2.0mm-3.5mm is provided in fig. 9, and is in the range of 1.5-2.5MPa, if the cell diameter is larger, the radius can also be selected to be larger than 3.5mm, but the corresponding pressure relief pressure needs to be larger than 1.5MPa.

The radius selected in this embodiment is 2.0mm-3.5mm, which is also the most suitable selected length for conventional batteries, conventional settings and conventional cell sizes.

It is emphasized that the conventional settings of the parameters influencing the pressure relief pressure mentioned in the present application are known in the art, such as the thickness of the housing 1, the material of the housing 1, the strength of the housing 1, etc., which are of industry standard. For example, the material can be selected from steel, aluminum plastic film, aluminum alloy, aluminum and the like, the thickness of the shell 1 is set by millimeter or centimeter, the wiring of the explosion-proof wire 2 is set conventionally by one or more wires, and the explosion-proof wire 2 is set unconventionally if the whole shell 1 is covered with the explosion-proof wire 2 without gaps.

Under unconventional settings, even if the depth ratio, the central angle and the radius of the explosion-proof wire 2 all meet the requirements of the application, the pressure relief pressure cannot meet the requirements, for example, the strength of the shell 1 is too high, the pressure relief pressure cannot be reduced even if the depth ratio reaches 90%, and the pressure relief pressure cannot be reduced even if the central angle is 180 degrees, and the pressure relief pressure cannot be reduced if the radius is larger; for another example, if the strength of the casing 1 is too low, the pressure relief pressure cannot be achieved even if the depth ratio is less than 40%, the pressure relief pressure cannot be achieved even if the central angle is much larger or much smaller than 180 degrees, and the pressure relief pressure cannot be achieved even if the radius is too small, and finally the casing 1 is easily broken.

Therefore, the depth ratio, the central angle and the radius selected by the application are the most suitable choices for the conventional use, and the better effect is achieved.

Note that the relational diagrams in fig. 7, 8, and 9 in the present application are obtained through simulation and experiment.

In addition, the present application may also adopt other wiring forms of the explosion-proof wire 2, specifically, may be:

the explosion-proof wire 2 is in a shape of a line segment with a certain length, or adopts a combined arrangement form of the line segment and a circular arc, and the specific embodiment thereof can be as follows: 1. as shown in fig. 4, one end of each of the three line segments is a central point 4, and included angles between the three line segments are 120 degrees; 2. as shown in fig. 5, the form of a cross of two line segments is adopted, and the cross point is a central point 4; 3. as shown in fig. 6, a combination of a semicircular arc tangent to the center point 4 and a line segment whose one end passes through the center point 4 is used.

The present application may take wiring forms including, but not limited to, the embodiments described above.

As shown in fig. 2 and 3, as a preferred embodiment provided by the present embodiment, a reinforcing rib 3 is further provided on the housing 1, the reinforcing rib 3 is provided on the opening surface so as to be able to better break the explosion-proof wire 2, the reinforcing rib 3 is provided on the opening surface, the arrangement extension shape of the reinforcing rib 3 on the opening surface is adapted to the arrangement extension shape of the explosion-proof wire 2 on the opening surface, and the distance between the reinforcing rib 3 and the explosion-proof wire 2 is 0.1 to 2mm.

Specifically, the shell 1 at the reinforcing rib 3 is thinner and is closer to the explosion-proof line 2, and when pressure is generated inside the battery, the pressure at the position of the reinforcing rib 3 is larger, so that the explosion-proof line 2 nearby is more favorable for cracking, and a safety protection effect is achieved.

The shape of the reinforcing ribs 3 is similar to that of the explosion-proof thread 2, for example, when the explosion-proof thread 2 is semicircular, the reinforcing ribs 3 are also semicircular and are consistent with the extending direction of the explosion-proof thread 2, and the distance between the reinforcing ribs and the explosion-proof thread is only 0.1-2mm.

As shown in fig. 3, the reinforcing rib 3 is a stepped structure formed by stamping the housing 1 and having a convex side and a concave side. Corresponding to the case 1 being displaced after punching, the thickness of the joint between the reinforcing rib 3 and the adjacent case 1 is reduced after the displacement, specifically, the thickness at the position L in fig. 3 is reduced compared with the thickness of the case 1.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. Battery explosion-proof construction, characterized by, includes:

the battery comprises a shell, a battery core and a battery cover, wherein the shell is used for accommodating the battery core; and

the explosion-proof line is arranged on the inner surface and/or the outer surface of the shell, the explosion-proof line is a groove formed in the surface of the shell, the groove is a linear groove body extending on the surface of the shell, the surface where the explosion-proof line is located is a circular, regular polygonal or rectangular opening surface, the opening surface is provided with a central point, the explosion-proof line passes through the central point of the opening surface, and the opening depth of the explosion-proof line is 40% -80% of the thickness of the shell.

2. The battery explosion-proof structure of claim 1, wherein the explosion-proof line is opened to a depth of 70% of the thickness of the case.

3. The explosion-proof structure for batteries according to claim 1 or 2, wherein the explosion-proof line extends on the surface of the case to form a circular arc shape, and the width of the groove becomes gradually larger from the groove bottom to the notch.

4. The explosion proof structure for battery as claimed in claim 3, wherein the explosion proof line corresponds to a central angle of 150 ° to 240 °.

5. The battery explosion prevention structure of claim 4, wherein said explosion prevention line corresponds to a central angle of 180 °.

6. The battery explosion-proof structure of claim 3, wherein there are two explosion-proof lines, the two explosion-proof lines are tangent, and the tangent point is the central point.

7. The battery explosion-proof structure of claim 6, wherein said central point is a midpoint of the two explosion-proof lines in a length direction.

8. The battery explosion-proof structure of claim 3, wherein the radius of the circle on which the explosion-proof wire is located is 2.0mm to 3.5mm.

9. The explosion proof structure for battery as claimed in claim 8, wherein the radius of the circle on which the explosion proof line is located is 3.5mm.

10. The battery explosion-proof structure of claim 1, wherein a reinforcing rib is further provided on the housing, the reinforcing rib is provided on the opening surface, the arrangement extension shape of the reinforcing rib on the opening surface is matched with the arrangement extension shape of the explosion-proof wire on the opening surface, the distance between the reinforcing rib and the explosion-proof wire is 0.1mm-2mm, and the reinforcing rib is a stepped structure formed by stamping the housing with one side protruding and the other side recessed.

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