CN217114680U - Explosion-proof structure and power battery - Google Patents

Abstract

The utility model provides an explosion-proof structure and a power battery, wherein the explosion-proof structure comprises a main body part and a welding part annularly arranged on the edge of the main body part, and the main body part protrudes out of the welding part; the main body part comprises a blasting groove, and a blasting sheet is arranged at the bottom of the blasting groove. The utility model discloses at the blasting in-process, the rupture disk flew out under the blast groove guide effect, avoids the non-directional blasting to cause the safety problem, in addition, because the rupture disk sets up in the blast groove, annotating the liquid in-process, avoids electrolyte contact rupture disk, effectively improves durability, stability and the security of battery explosion-proof structure.

Description

Explosion-proof structure and power battery

Technical Field

The utility model belongs to the technical field of power battery, a explosion-proof structure and power battery are related to.

Background

The existing automobile power battery (such as a lithium ion battery) generally has a large volume in order to meet the high-power requirement when an automobile runs. Therefore, more and more gas is generated in the power battery due to electrochemical reaction, and in order to prevent explosion accidents caused by excessive gas generated in the power battery, the conventional power battery is provided with an explosion-proof valve. The working principle of the explosion-proof valve is that when the gas generated in the power battery reaches a certain pressure, the explosion-proof valve is opened to discharge the gas in the power battery, so that the explosion caused by excessive gas accumulation in the power battery is avoided.

The explosion-proof structure of the explosion-proof top cover of the power battery is mainly characterized in that a thinner rupture disc is firstly processed by a stamping method, then the rupture disc is welded on a corresponding explosion-proof hole on the explosion-proof top cover, when explosion danger occurs, the internal pressure of the battery rises to a certain degree, the rupture disc can fly out at a non-directional high speed, and when a single battery cell test is carried out, a tester is easily injured; and the rupture disk structure on the existing market mostly adopts the plane structure, and when the power battery of its preparation is annotated the liquid, because electrolyte can spill over and annotate the liquid hole, electrolyte can dip the risk in the rupture disk this moment.

CN206022439U discloses an rupture membrane and top cap piece integrated into one piece's explosion-proof top cap of power battery, including the top cap piece, the part of top cap piece forms the recess through processing, the top cap piece forms the rupture membrane in the region of recess bottom, be equipped with the minimum score that bursts of intensity on the rupture membrane, when the inside pressure of power battery is greater than the pressure that the score can bear that bursts, the rupture membrane splits along the score that bursts, form the inside and outside exhaust hole of intercommunication power battery, discharge high temperature highly compressed gas outside the power battery, avoid the battery explosion, be equipped with the linking arm in the score that bursts, be used for after the rupture membrane splits along the score that bursts, the rupture membrane still links together with the top cap piece, avoid the rupture membrane to fly out at a high speed and hinder the people, the top of recess is equipped with the screening glass, be used for avoiding the rupture membrane to be accidentally bruised by the foreign object. The utility model discloses a saved processes such as stamping rupture membrane, welding, the sealed detection of welding seam, the process is simpler, and the cost is lower to the performance is more reliable.

CN107170918A discloses an explosion-proof cover cap of a lithium ion power battery and a manufacturing method thereof, the explosion-proof cover cap comprises a sealing ring, the sealing ring is wrapped by a steel cap, an explosion-proof valve, a spacing ring and an aluminum hole plate, a bulge is arranged at the position of the steel cap far away from the battery, a recess is arranged at the position of the explosion-proof valve facing the battery and forms a cap-shaped structure, one surface of the explosion-proof valve is connected with the steel cap, the other surface of the explosion-proof valve is connected with the aluminum hole plate, the spacing ring is arranged between the explosion-proof valve and the aluminum hole plate, a flanging structure only covering the side surface of the edge of the steel cap is arranged at the edge of the explosion-proof valve, and the steel cap is separated from the sealing ring by the flanging structure. The flanging structure in this scheme is used for separating steel cap and sealing washer, and flanging structure can effectively avoid the electrolyte of battery to pass through the gap between steel cap and the explosion-proof valve to ooze, wherein because flanging structure only covers the side at steel cap edge, consequently can reduce the sealing end height, increase slot rolling shoulder height than the structure of borduring, realizes widening the pole piece and promotes the purpose of capacity, also can reduce the consumptive material simultaneously, practices thrift the cost.

Therefore, how to provide an explosion-proof structure with high durability, good stability and high safety is a technical problem which needs to be solved urgently at present.

SUMMERY OF THE UTILITY MODEL

An it is not enough to prior art existence, the utility model aims to provide an explosion-proof structure and power battery, through setting up the main part protrusion the weld part is and set up the blasting groove, and the piece that explodes in-process flies out under the blasting groove guide effect, avoids the non-directional blasting to cause the safety problem, in addition, because the piece that explodes sets up in the blasting groove, annotates the liquid in-process, avoids electrolyte contact blasting piece, effectively improves durability, stability and the security of battery explosion-proof structure.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides an explosion-proof structure, which comprises a main body part and a welding part annularly arranged on the edge of the main body part, wherein the main body part protrudes out of the welding part; the main body part comprises a blasting groove, and a blasting sheet is arranged at the bottom of the blasting groove.

The utility model discloses a with main part protrusion weld part, the main part sets up the blasting groove, and set up the rupture disk in the blasting inslot, at first at the blasting in-process, the blasting groove provides the blasting guide effect, make the rupture disk can follow the opening direction departure in blasting groove, avoid the personnel safety problem that the non-directional blasting caused, secondly, the rupture disk sets up at the blasting inslot, annotate the liquid in-process, even electrolyte flows the casing, the outer wall in blasting groove can block electrolyte, reduce the contact of electrolyte and rupture disk, thereby avoid electrolyte to corrode the rupture disk, improve the durability of rupture disk, the utility model has the characteristics of simple structure, durability height and security height.

It should be noted that the utility model discloses do not do specific requirements and special restriction to the whole shape of blasting structure, the technical staff in the art can be according to specific operation requirement reasonable setting, for example the blasting structure is circular, runway type or square.

As a preferred embodiment of the present invention, the height of the main body portion is greater than the height of the welding portion.

The utility model improves the overall stability of the explosion-proof structure by arranging the main body part with a height larger than the height of the welding part,

as a preferable aspect of the present invention, the burst groove is formed integrally with the main body portion.

As a preferred technical scheme of the utility model, the outline of blasting groove is circular structure.

In a preferred embodiment of the present invention, the overall thickness of the explosion-proof structure is 0.5mm to 3mm, for example, 0.5mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm or 3.0mm, but the present invention is not limited to the above-mentioned values, and other values not listed in the above-mentioned range of values are also applicable.

The thickness of the welded portion is 0.3mm to 0.8mm, for example, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm or 0.8mm, but the thickness is not limited to the above-mentioned values, and other values not shown in the above-mentioned value range are also applicable.

The depth of the blasting groove is 0.05mm to 0.15mm, for example 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm or 0.15mm, but is not limited to the values listed, and other values not listed in this range of values are equally applicable.

As a preferred technical scheme of the utility model, the lower surface of rupture disk is higher than the upper surface of weld part.

As an optimal technical scheme of the utility model, be close to edge one side of rupture disk, be provided with at least one blasting scoring groove on the rupture disk.

As a preferred technical solution of the present invention, the blasting sheet is provided with one of the blasting scoring grooves, the blasting scoring groove is continuously arranged along the edge of the blasting sheet, the blasting scoring groove includes at least one section of shallow scoring section, and the depth of the shallow scoring section is smaller than the depth of other sections of the blasting scoring groove; or the blasting sheet is provided with at least two blasting scoring grooves which are arranged at intervals along the edge of the blasting sheet.

As a preferred technical solution of the present invention, the cross-sectional shape of the blasting scoring groove includes a rectangle, a V-shape or a trapezoid.

The distance between the bottom of the blast scoring groove and the lower surface of the rupture disc is 0.15mm to 0.75mm, for example 0.15mm, 0.25mm, 0.35mm, 0.45mm, 0.55mm, 0.65mm or 0.75mm, but is not limited to the recited values, and other values not recited in this range of values are equally applicable.

The utility model also provides a power battery, power battery includes the casing, be provided with on the casing like the first aspect explosion-proof construction.

It should be noted that, the utility model discloses well power battery's kind can be according to operation requirement reasonable selection, for example power battery is lithium ion battery, including the casing that has injected into electrolyte, is provided with electric core in the casing, and electric core is including the anodal diaphragm and the negative pole that stack gradually the setting, and wherein electric core can be lamination electric core and also can be coiling electric core, has seted up the blast hole on the shell, the first aspect the welding portion welding of explosion-proof structure set up on the blast hole.

Exemplarily, the operations of the liquid injection process and the blasting process of the power battery are provided, which specifically include the following steps:

electrolyte is injected into the shell of the battery through the liquid injection hole, if the electrolyte overflows and flows to the explosion-proof structure, the main body part protrudes from the welding part, and the main body part is internally provided with the explosion groove, so that the outer wall of the explosion groove blocks the electrolyte from flowing in, and the electrolyte is prevented from contacting with the explosion piece;

after the battery is assembled, if the internal pressure of the battery rises to the blasting pressure in the use process, the blasting mark groove is broken, and the blasting piece flies out along the opening direction of the blasting groove.

The numerical range of the present invention includes not only the point values listed above, but also any point values between the above numerical ranges not listed, which is limited to space and for the sake of brevity, the present invention does not exhaust the specific point values included in the range.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a with main part protrusion weld part, the main part sets up the blasting groove, and set up the rupture disk in the blasting inslot, at first at the blasting in-process, the blasting groove provides the blasting guide effect, make the rupture disk can follow the opening direction departure in blasting groove, avoid the personnel safety problem that the non-directional blasting caused, secondly, the rupture disk sets up at the blasting inslot, annotate the liquid in-process, even electrolyte flows the casing, the outer wall in blasting groove can block electrolyte, reduce the contact of electrolyte and rupture disk, thereby avoid electrolyte to corrode the rupture disk, improve the durability of rupture disk, the utility model has the characteristics of simple structure, durability height and security height.

Drawings

Fig. 1 is a schematic view of an explosion-proof structure provided in an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of an explosion-proof structure provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a blasting score line groove in an explosion-proof structure according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another blasting score line groove in an explosion-proof structure according to an embodiment of the present invention.

Wherein, 1-main body part; 2-a weld; 3-rupture disk; 4-blasting marking groove.

Detailed Description

It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.

It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly, and may for example be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

In a specific embodiment, the present invention provides an explosion-proof structure, as shown in fig. 1 and 2, the explosion-proof structure includes a main body portion 1 and a welding portion 2 annularly disposed on an edge of the main body portion 1, wherein the main body portion 1 protrudes from the welding portion 2; the main body part 1 comprises a blasting groove, and a blasting sheet 3 is arranged at the bottom of the blasting groove. Optionally, the blasting structure is circular, racetrack, or square in appearance.

Specifically, the height of the main body 1 is greater than that of the welding part 2, and further, the blast groove is integrally formed with the main body 1, and the outer contour of the blast groove is a circular structure.

Specifically, as shown in fig. 2, wherein a represents the thickness of the welding part 2, B represents the thickness of the explosion-proof structure having a thickness of 0.5mm to 3mm, the thickness of the welding part 2 is 0.3mm to 0.8mm, and the depth of the explosion groove is 0.05mm to 0.15 mm.

Specifically, the lower surface of the rupture disk 3 is higher than the upper surface of the welding portion 2.

Specifically, at least one blasting score line groove 4 is arranged on the rupture disk 3 near one side of the edge of the rupture disk 3. Further as shown in fig. 3, be provided with a blasting mark groove 4 on the rupture disk 3, blasting mark groove 4 is followed the edge of rupture disk 3 sets up in succession, blasting mark inslot includes one section at least shallow mar section, the degree of depth of shallow mar section is less than the degree of depth of other sections in blasting mark groove effectively avoids 3 degrees of weakness of rupture disk, takes place to damage under normal operating mode, takes place the problem of blasting in advance. Or, as shown in fig. 4, at least two blasting score grooves 4 are formed in the rupture disk 3, and the blasting score grooves 4 are arranged at intervals along the edge of the rupture disk 3.

Specifically, the cross-sectional shape of the blast scoring groove includes a rectangle, a V shape or a trapezoid, and further, as shown in fig. 2, the distance between the bottom of the blast scoring groove 4 and the lower surface of the rupture disk 3 is 0.15mm to 0.75mm, that is, C represents the distance between the bottom of the blast scoring groove 4 and the lower surface of the rupture disk 3.

The utility model also provides a power battery, power battery includes the casing, be provided with on the casing like the first aspect explosion-proof construction. Optionally, the power battery is a lithium ion battery, and includes a casing into which an electrolyte is injected, a battery cell is arranged in the casing, the battery cell includes a positive diaphragm and a negative diaphragm which are sequentially stacked, the battery cell may be a laminated battery cell or a wound battery cell, a bursting hole is formed in the casing, and on the first aspect, the welding portion 2 of the explosion-proof structure is welded and arranged on the bursting hole.

Exemplarily, the operations of the liquid injection process and the blasting process of the power battery are provided, which specifically include the following steps:

electrolyte is injected into the shell of the battery through the liquid injection hole, if the electrolyte overflows and flows to the explosion-proof structure, the main body part 1 protrudes from the welding part 2, and a blasting groove is arranged in the main body part 1, the outer wall of the blasting groove blocks the electrolyte from flowing in, so that the electrolyte is prevented from contacting with the blasting sheet 3;

after the battery is assembled, if the internal pressure of the battery rises to the explosion pressure in the use process, the explosion score line groove 4 is broken, and the explosion piece 3 flies out along the opening direction of the explosion groove.

The utility model, by projecting the main body part 1 out of the welding part 2, arranging the main body part 1 with the blasting groove and arranging the blasting sheet 3 in the blasting groove, firstly during the blasting process, the blasting groove provides blasting guide function, so that the blasting sheet 3 can fly out along the opening direction of the blasting groove, thereby avoiding personnel safety problem caused by non-directional blasting, secondly, the blasting sheet 3 is arranged in the blasting groove, in the liquid injection process, even if the electrolyte flows out of the shell, the outer wall of the blasting tank can block the electrolyte, the contact between the electrolyte and the blasting sheet 3 is reduced, thereby avoiding the electrolyte from corroding the rupture disk 3 and improving the durability of the rupture disk 3, furthermore, the utility model also arranges that the thickness of the main body part 1 is larger than that of the welding part 2, thereby improve explosion-proof construction's overall stability, the utility model has the characteristics of simple structure, durability height and security height etc.

The applicant states that the above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceived by those skilled in the art within the technical scope of the present invention are all within the protection scope and the disclosure scope of the present invention.

Claims (10)

1. The explosion-proof structure is characterized by comprising a main body part and a welding part annularly arranged on the edge of the main body part, wherein the main body part protrudes out of the welding part;

the main body part comprises a blasting groove, and a blasting sheet is arranged at the bottom of the blasting groove.

2. An explosion proof structure according to claim 1 wherein the height of the main body portion is greater than the height of the weld portion.

3. A blast-resistant construction according to claim 1, wherein the blast groove is formed integrally with the main body part.

4. An explosion vent according to claim 1, wherein the profile of the blast groove is of circular configuration.

5. The blast-resistant construction according to claim 1, characterized in that the overall thickness of the blast-resistant construction is 0.5mm to 3 mm; the thickness of the welding part is 0.3 mm-0.8 mm; the depth of the blasting groove is 0.05 mm-0.15 mm.

6. The explosion proof structure of claim 1 wherein the lower surface of the rupture disc is higher than the upper surface of the welded portion.

7. An explosion-proof structure as claimed in claim 1, wherein at least one blast scoring groove is provided on the rupture disc adjacent to one side of the edge of the rupture disc.

8. The blast-resistant structure according to claim 7, wherein the blast chip is provided with one blast scoring groove, the blast scoring groove is continuously arranged along the edge of the blast chip, the blast scoring groove comprises at least one section of shallow scoring segment, and the depth of the shallow scoring segment is smaller than that of other sections of the blast scoring groove; or the blasting sheet is provided with at least two blasting scoring grooves which are arranged at intervals along the edge of the blasting sheet.

9. The blast-resistant structure according to claim 7, wherein the sectional shape of the blast scoring groove comprises a rectangle, a V-shape, or a trapezoid;

the distance between the bottom of the blasting scoring groove and the lower surface of the rupture disk is 0.15-0.75 mm.

10. A power battery, characterized in that the power battery comprises a housing, and the explosion-proof structure of any one of claims 1-9 is arranged on the housing.

Images