CN212161952U - Battery case and battery - Google Patents
Battery case and battery Download PDFInfo
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- CN212161952U CN212161952U CN202021199067.XU CN202021199067U CN212161952U CN 212161952 U CN212161952 U CN 212161952U CN 202021199067 U CN202021199067 U CN 202021199067U CN 212161952 U CN212161952 U CN 212161952U
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Abstract
The utility model discloses a battery case and battery belongs to battery safety technical field. The utility model provides a battery case includes battery case and explosion-proof valve structure, and explosion-proof valve structure is including the glue film, rete and the combined material layer that stack gradually the setting, and the annular structure of glue film for having the bleeder vent, and the first face of bonding of glue film bonds on battery case's outer wall to have and predetermine adhesive strength, the bleeder vent is just to setting up with the explosion-proof valve installing port, and the rete bonds on the second face of bonding of glue film, and covers the bleeder vent setting. The explosion-proof valve structure of the battery shell is bonded at the explosion-proof valve mounting opening on the battery shell through the glue layer, preset bonding strength is achieved between the explosion-proof valve structure and the battery shell, the size of the preset bonding strength is controlled to control the explosion pressure value of the explosion-proof valve structure, the structure is simple, cost is low, and the explosion-proof purpose and the reliability are high.
Description
Technical Field
The utility model relates to a battery safety technical field especially relates to a battery case and battery.
Background
With the increasingly strict environmental requirements and the rapid development of science and technology, new energy automobiles are more and more widely used in daily life of people. The pure electric vehicle is an important component of a new energy vehicle, and the pure electric vehicle adopts a battery as a power source, so the manufacturing cost and the use safety of the battery are critical factors for determining the future development of the pure electric vehicle.
The explosion-proof valve is one of safe unblock parts when battery thermal runaway, and present explosion-proof valve adopts thimble blasting and spring blasting more, has the defect that the structure is complicated, manufacturing and design cost are all higher. Therefore, how to provide an explosion-proof valve with low cost and high reliability is a technical problem which needs to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a battery case, this battery case's explosion-proof valve structure is simple structure not only, with low costs, and the reliability is high.
To achieve the purpose, the utility model adopts the following technical proposal:
a battery case, comprising:
a battery case provided with an explosion-proof valve mounting port;
explosion-proof valve structure sets up explosion-proof valve installing port department, explosion-proof valve structure is including the glue film, rete and the combined material layer that stack gradually the setting, the annular structure of glue film for having the bleeder vent, the first face of bonding of glue film bonds on battery case's the outer wall to preset bonding strength has, the bleeder vent with explosion-proof valve installing port is just to setting up, the rete bonds on the second face of bonding of glue film, and covers the bleeder vent sets up.
Preferably, the glue layer is provided with a blasting notch, and the film layer covers the blasting notch.
Preferably, the explosion notch is a triangular opening with a preset included angle, so that the explosion-proof valve structure has a preset explosion pressure value.
Preferably, the number of the explosion-proof valve mounting openings is multiple;
the anti-explosion valve structure comprises an anti-explosion vent valve and an anti-explosion non-vent valve, the anti-explosion vent valve and the anti-explosion non-vent valve are respectively arranged at the installation openings of the anti-explosion valves, the film layer of the anti-explosion vent valve is a breathable film, and the film layer of the anti-explosion non-vent valve is a non-breathable film.
Preferably, the explosion-proof valve structure further comprises a fireproof structure, and the fireproof structure is bonded on the inner wall surface of the battery shell and is arranged opposite to the explosion-proof valve mounting opening.
Preferably, the fireproof structure comprises a plane metal net and a curved metal net which are arranged in a stacked mode, a first vent hole is formed in the plane metal net, a second vent hole is formed in the curved metal net, and the first vent hole is communicated with the second vent hole.
Preferably, a preset fire retardant distance is arranged between the plane metal net and the curved metal net.
Preferably, the cross-sectional shape of the explosion-proof valve structure can be a circle or a regular polygon.
Preferably, the explosion-proof valve mounting opening is provided in a side surface of the battery case, and the explosion-proof valve structure is provided in a side of the battery case.
Another object of the present invention is to provide a battery, which has high safety and low cost.
To achieve the purpose, the utility model adopts the following technical proposal:
a battery comprises the battery shell.
The utility model has the advantages that:
the utility model provides a battery case, battery case include battery case and explosion-proof valve structure, and explosion-proof valve structure is including the glue film, rete and the combined material layer that stack gradually the setting, and the annular structure of glue film for having the bleeder vent, and the first face of bonding of glue film bonds on battery case's outer wall to have and predetermine adhesive strength, the bleeder vent is just to setting up with the explosion-proof valve installing port, and the rete bonds on the second face of bonding of glue film, and covers the bleeder vent setting. The explosion-proof valve structure of the battery shell is bonded at the explosion-proof valve mounting opening on the battery shell through the glue layer, preset bonding strength is achieved between the explosion-proof valve structure and the battery shell, the size of the preset bonding strength is controlled to control the explosion pressure value of the explosion-proof valve structure, the structure is simple, cost is low, and the explosion-proof purpose and the reliability are high.
Drawings
Fig. 1 is a schematic structural diagram of a battery case provided by the present invention;
fig. 2 is an exploded view of the battery housing and explosion-proof valve structure provided by the present invention at a certain viewing angle;
FIG. 3 is an enlarged view of portion A of FIG. 2;
fig. 4 is a schematic structural view of the adhesive layer provided by the present invention;
fig. 5 is an exploded view of the battery housing and explosion-proof valve arrangement provided by the present invention from another perspective;
fig. 6 is an exploded view of the fire protection structure provided by the present invention;
fig. 7 is an assembly view of the fire protection structure provided by the present invention.
In the figure:
100. a battery case; 101. an explosion-proof valve mounting port; 200. an explosion-proof vent valve; 300. an explosion-proof non-venting valve;
1. a glue layer; 11. air holes are formed; 12. blasting the notch;
2. a film layer; 21. a gas permeable membrane; 22. a non-breathable film;
3. a composite material layer;
4. a fire-resistant structure; 41. a planar metal mesh; 411. a first vent hole; 42. a curved metal mesh; 421. a second vent.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; 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 in specific cases to those skilled in the art.
The present embodiment provides a battery case, as shown in fig. 1 and 2, which includes a battery case 100 and an explosion-proof valve structure mounted on an explosion-proof valve mounting opening 101 of the battery case 100 to discharge harmful gases when thermal runaway of a battery occurs, thereby achieving the purpose of preventing the occurrence of an explosion phenomenon of the battery.
As shown in fig. 3, the explosion-proof valve structure comprises a glue layer 1, a film layer 2 and a composite material layer 3 which are sequentially stacked. Wherein, glue film 1 is the loop configuration who has bleeder vent 11, and glue film 1 has first bonding face and second bonding face, and first bonding face bonds on battery case 100's outer wall face from battery case 100's outside, and can make glue film 1 and battery case 100 between have preset adhesive strength through the material of control bonding area and/or glue film 1. When the adhesive layer 1 is adhered to the outer wall surface of the battery case 100, it is necessary to ensure that the vent hole 11 is arranged opposite to the explosion-proof valve mounting opening 101. The second face of bonding of glue film 1 is used for bonding with rete 2, and rete 2 covers bleeder vent 11 and sets up, and the harmful gas who reveals from battery case 100 inside can contact with rete 2 through bleeder vent 11. The composite material layer 3 is a sheet structure made of high polymer materials such as PET or PI, and the composite material layer 3 is bonded on the other side face, far away from the glue layer 1, of the film layer 2 so as to protect the film layer 2 and improve the structural strength of the whole explosion-proof valve structure.
This explosion-proof valve structure improves structural strength by bonding battery case 100 and film layer 2 with glue layer 1. And this explosion-proof valve structure makes it have the blast pressure value of settlement through the bonding strength of control glue film 1 and battery case 100, compare the explosion-proof valve that adopts thimble blasting and spring blasting among the prior art, simple structure not only can reduce design and manufacturing cost, and after the pressure of the inside harmful gas of battery to this explosion-proof valve structure is greater than this blast pressure value, glue film 1 can become invalid, and can form the gas vent between battery case 100 and explosion-proof valve structure, with the inside gas of discharge battery case 100, reach the purpose that prevents the battery explosion.
The appearance of the explosion-proof valve structure can be circular, regular quadrangle, regular pentagon or regular polygon with more than five sides, and under the same gluing area, the number of the switching positions between two sides is different due to the different sides, so that the preset explosion pressure values of the explosion-proof valve structures in different shapes are different. Specifically, when the number of the sides is more, the switching positions between the two sides are more, the failure speed of the adhesive layer 1 is slower, and therefore the preset explosion pressure value is larger, so in the explosion-proof valve structures with different shapes, the circular preset explosion pressure value < the regular quadrilateral preset explosion pressure value < the regular pentagonal preset explosion pressure value < the number of the regular polygonal sides is larger than five preset explosion pressure values. The shape of the explosion-proof valve structure can be selected according to the requirement, and it should be noted that the shapes of the adhesive layer 1, the film layer 2 and the composite material layer 3 need to be matched with the shape of the explosion-proof valve mounting port 101. In this embodiment, since the mounting opening 101 of the explosion-proof valve is a rectangular opening, the structure of the explosion-proof valve is a rectangular structure, that is, the adhesive layer 1 is a rectangular ring frame structure, and both the film layer 2 and the composite material layer 3 are rectangular sheet structures.
In order to gradually exhaust harmful gas in the battery to avoid the explosion-proof valve structure from falling off at a high speed due to overlarge internal pressure of the battery, and further avoid the explosion-proof valve structure from falling off at a high speed from causing impact damage to equipment and parts around the battery, as shown in fig. 4, an explosion notch 12 is arranged on the adhesive layer 1, and the explosion notch 12 is communicated with the air holes 11. When the explosion-proof valve structure is installed to the explosion-proof valve installation opening 101, the explosion notch 12 is arranged opposite to the explosion-proof valve installation opening 101 and covered by the film layer 2.
The arrangement of the blasting notch 12 divides the bonding part of the glue layer 1 and the battery case 100 into a less glue part and a more glue part, the bonding area of the less glue part is small, so that the bonding strength of the part is small, and the bonding area of the more glue part is large, so that the bonding strength of the part is large. When the harmful gas in the battery is gradually increased, the pressure in the battery shell 100 is gradually increased, the bonding strength of the glue-lacking part is firstly achieved, at the moment, the glue-lacking part is firstly failed, and the film layer 2 and the composite material layer 3 corresponding to the glue-lacking part are firstly separated from the battery shell 100 to form a smaller exhaust port and exhaust; subsequently, as the pressure inside the battery case 100 is further increased, the adhesive layer 1 around the less adhesive part gradually loses efficacy, and when the adhesive strength of the more adhesive part is reached, the whole film layer 2 falls off and loses efficacy, and the whole film layer 2 and the composite material layer 3 are separated from the battery case 100, so that the overall falling off blasting is realized.
Alternatively, in the present embodiment, the blasting notch 12 is a triangular opening, and the triangular opening may be an isosceles triangular opening or a non-isosceles triangular opening. The triangular opening is provided with a preset included angle, and the size of the preset included angle is controlled, so that the explosion-proof valve structure has a preset explosion pressure value. Specifically, in the embodiment, the width of the glue layer 1 is 3mm to 5mm, the setting range of the preset included angle is 30 degrees to 60 degrees, the corresponding range of the preset burst pressure value is 10kPa to 40kPa, and when the preset included angle is 30 degrees, the corresponding preset burst pressure value is 40 kPa; when the preset included angle is 60 degrees, the corresponding preset blasting pressure value is 10 kPa. Of course, in other embodiments, the shape of the blasting notch 12 may be set to other shapes according to requirements, but in specific design, the blasting pressure value corresponding to other shapes needs to be obtained according to experiments.
In order to reduce the generation of condensation inside the battery under the premise of meeting the requirement of ventilation capacity before thermal runaway of the battery and ensuring the safety performance of the battery, in this embodiment, a plurality of explosion-proof valve mounting ports 101 are provided on the battery shell 100, the explosion-proof valve structure adopts the combination of an explosion-proof ventilation valve 200 and an explosion-proof non-ventilation valve 300, and the explosion-proof ventilation valve 200 and the explosion-proof non-ventilation valve 300 are respectively mounted at the plurality of explosion-proof valve mounting ports 101.
The structure of the explosion-proof ventilation valve 200 is basically the same as that of the explosion-proof non-ventilation valve 300, and the explosion-proof ventilation valve comprises a glue layer 1, a film layer 2 and a composite material layer 3 which are arranged in a stacked mode. The glue layer 1 and the composite material layer 3 of the explosion-proof ventilation valve 200 and the explosion-proof non-ventilation valve 300 are the same, and only the film layer 2 is different. The membrane layer 2 of the explosion-proof vent valve 200 is a vent membrane 21, the vent membrane 21 can allow air and other gases to pass through, when pressure difference is generated inside and outside the battery due to temperature or altitude change in the battery, the air can pass through the vent membrane 21 of the explosion-proof vent valve 200 to enter and exit the battery so as to adjust the pressure difference inside and outside the battery, so that the pressure inside and outside the battery is balanced, and the battery shell 100 is prevented from being broken due to overlarge or undersize internal pressure. The film layer 2 of the explosion-proof non-breathable valve 300 is the non-breathable film 22, and the non-breathable film 22 does not have a breathable function, so that water vapor outside the battery can be effectively prevented from entering the battery, and therefore the purposes of avoiding the generation of condensation inside the battery and improving the safety performance of the battery are achieved.
Specifically, as shown in fig. 1 and 2, in the present embodiment, three explosion-proof valve mounting ports 101 are arranged side by side, wherein an explosion-proof vent valve 200 is mounted at one explosion-proof valve mounting port 101, and an explosion-proof non-vent valve 300 is mounted at the other two explosion-proof valve mounting ports 101. Of course, in other embodiments, the number of the explosion-proof valve mounting ports 101 may be increased or decreased according to the requirement, and correspondingly, the number of the explosion-proof ventilation valve 200 and the explosion-proof non-ventilation valve 300 may also be increased or decreased according to the requirement. Further, the explosion-proof vent valve 200 and the explosion-proof non-vent valve 300 adopt the same type of adhesive layer 1, and the same bonding area with the battery case 100, so as to have the same preset burst pressure value, so as to realize simultaneous burst.
Further, as shown in fig. 5 to 7, the explosion-proof valve structure further includes a fire-proof structure 4, and the fire-proof structure 4 can prevent flame from escaping through the explosion-proof valve mounting port 101 when thermal runaway occurs in the battery, and specifically, the fire-proof structure 4 is bonded to the inner wall surface of the battery case 100 through a structural adhesive layer and is disposed opposite to the explosion-proof valve mounting port 101. It should be noted that the adhesion strength of the fireproof structure 4 to the inner wall surface of the battery case 100 is much greater than the pressure inside the battery during thermal runaway of the battery, so as to ensure the use effect of the fireproof structure 4.
Specifically, as shown in fig. 6 and 7, in the present embodiment, the fire protection structure 4 includes a planar metal mesh 41 and a curved metal mesh 42 that are stacked, the planar metal mesh 41 is manufactured by a profile extrusion process, a first vent hole 411 is formed in the planar metal mesh 41, and the arrangement of the first vent hole 411 not only can achieve the purpose of reducing weight, but also can avoid affecting the gas entering and exiting the explosion-proof valve mounting opening 101. The curved metal net 42 is formed by high-pressure casting, the second vent hole 421 is formed in the curved metal net, the first vent hole 411 is communicated with the second vent hole 421, and the second vent hole 421 can not only achieve the purpose of reducing weight, but also avoid influencing the gas to enter and exit the explosion-proof valve mounting opening 101.
In this embodiment, the planar metal net 41 is a grid structure, the curved metal net 42 is a shell structure, and includes a top plate and a ring edge protruding inwards along the edge of the top plate, the second vent holes 421 are disposed on the top plate, and the planar metal net 41 is connected to the ring edge through a welding process, so that the planar metal net 41 and the curved metal net 42 form a box-shaped structure. Above-mentioned setting makes and has predetermine back-fire relief distance between curved surface metal mesh 42's the roof and the plane metal mesh 41, in this embodiment, does not do the restriction to this predetermine back-fire relief distance, sets for as required. Further, first air vent 411 and the crisscross setting of second air vent 421, the crisscross setting of this air vent combines with both the setting of predetermineeing the back-fire relief distance, can play the back-fire relief performance that improves the battery and the security performance of battery when improving thermal runaway plays dual function.
Optionally, in this embodiment, the first vent holes 411 are rectangular holes, and the second vent holes 421 are strip-shaped holes. Of course, in other embodiments, the shapes of the first ventilating hole 411 and the second ventilating hole 421 may be changed according to the requirement, for example, the first ventilating hole 411 may be a circular hole, and the second ventilating hole 421 may be a kidney-shaped hole.
The present embodiment also provides a battery including a battery case 100 and the above-described explosion-proof valve structure. Wherein the battery case 100 includes an upper case and a lower case disposed opposite to each other, and the explosion-proof valve structure may be disposed on the upper case or the lower case. The battery reduces the manufacturing and design cost by using the explosion-proof valve structure, and is favorable for popularization of the electric automobile using the battery.
Further, an explosion-proof valve mounting opening 101 is opened in a side surface of the upper case or the lower case, and an explosion-proof valve structure is provided in a side of the battery case 100. The arrangement of the explosion-proof valve structure at the side of the battery case 100 has the following advantages: on one hand, harmful gas or flame can be prevented from being directly sprayed to the passenger compartment when the thermal runaway of the battery pack occurs due to the arrangement on the upper surface of the battery shell 100; on the other hand, the anti-explosion valve structure is arranged on the side of the battery shell 100, so that the anti-explosion valve structure can be protected to a certain extent by utilizing the safety distance between the battery shell 100 and the vehicle body, and the reliability of the anti-explosion valve structure is improved.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A battery case, comprising:
a battery case (100) provided with an explosion-proof valve mounting port (101);
explosion-proof valve structure sets up explosion-proof valve installing port (101) department, explosion-proof valve structure is including glue film (1), rete (2) and combined material layer (3) that stack gradually the setting, the loop configuration of glue film (1) for having bleeder vent (11), the first face of bonding of glue film (1) bonds on the outer wall of battery case (100) to preset bonding strength has, bleeder vent (11) with explosion-proof valve installing port (101) are just to setting up, rete (2) bond on the second face of bonding of glue film (1), and cover bleeder vent (11) set up.
2. The battery case according to claim 1,
the glue layer (1) is provided with a blasting notch (12), and the film layer (2) covers the blasting notch (12).
3. The battery case according to claim 2,
the explosion gap (12) is a triangular opening with a preset included angle, so that the explosion-proof valve structure has a preset explosion pressure value.
4. The battery case according to claim 1,
the number of the explosion-proof valve mounting openings (101) is multiple;
the anti-explosion vent valve structure comprises an anti-explosion vent valve (200) and an anti-explosion non-vent valve (300), wherein the anti-explosion vent valve (200) and the anti-explosion non-vent valve (300) are respectively installed at a plurality of anti-explosion valve installation ports (101), the membrane layer (2) of the anti-explosion vent valve (200) is a gas-permeable membrane (21), and the membrane layer (2) of the anti-explosion non-vent valve (300) is a non-gas-permeable membrane (22).
5. The battery can according to any one of claims 1 to 4, wherein the explosion-proof valve structure further comprises a fire-proof structure (4), and the fire-proof structure (4) is bonded to an inner wall surface of the battery case (100) and is disposed opposite to the explosion-proof valve mounting port (101).
6. The battery case according to claim 5,
fireproof structure (4) are including plane metal mesh (41) and curved surface metal mesh (42) of range upon range of setting, be provided with first air vent (411) on plane metal mesh (41), be provided with second air vent (421) on curved surface metal mesh (42), first air vent (411) with second air vent (421) intercommunication.
7. The battery case according to claim 6,
and a preset fire retardant distance is reserved between the plane metal net (41) and the curved metal net (42).
8. The battery case according to claim 1,
the cross-sectional shape of the explosion-proof valve structure can be circular or regular polygon.
9. The battery case according to claim 1,
the explosion-proof valve mounting port (101) is formed in the side face of the battery shell (100), and the explosion-proof valve structure is arranged on the side of the battery shell (100).
10. A battery comprising the battery case according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021199067.XU CN212161952U (en) | 2020-06-24 | 2020-06-24 | Battery case and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021199067.XU CN212161952U (en) | 2020-06-24 | 2020-06-24 | Battery case and battery |
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| Publication Number | Publication Date |
|---|---|
| CN212161952U true CN212161952U (en) | 2020-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021199067.XU Active CN212161952U (en) | 2020-06-24 | 2020-06-24 | Battery case and battery |
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| CN (1) | CN212161952U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114188655A (en) * | 2021-11-24 | 2022-03-15 | 士彩材料科技（苏州）有限公司 | Explosion-proof balance valve capable of automatically realizing blasting at high temperature |
-
2020
- 2020-06-24 CN CN202021199067.XU patent/CN212161952U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114188655A (en) * | 2021-11-24 | 2022-03-15 | 士彩材料科技（苏州）有限公司 | Explosion-proof balance valve capable of automatically realizing blasting at high temperature |
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