CN218548704U - Battery cell with directional explosion spraying device, battery unit and battery pack - Google Patents

Abstract

The utility model relates to a take directional blowout device's electric core, battery unit and battery package, electric core include plastic-aluminum membrane body, explosion-proof valve, and the plastic-aluminum membrane body has the electric core holding chamber of encapsulation electric core body, and the non-banding position on the week side of plastic-aluminum membrane body is formed with outside bellied convex closure structure, have in the convex closure structure with the assembly chamber of electric core holding chamber intercommunication, explosion-proof valve installs structural and with the assembly chamber intercommunication of convex closure. The utility model discloses set up the convex closure structure, and form the assembly chamber in the convex closure structure, structural explosion-proof valve that sets up of convex closure again, when electric core takes place the thermal runaway, the thermal runaway gas can be assembled the intracavity gathering, and then from the structural explosion-proof valve of convex closure explode and spout, the convex closure structure can set up the arbitrary non-banding position in aluminium-plastic film body week side, thereby can realize the directional blowout of inside electric core body, to a great extent has simplified the module and the design that the pack was spread about heat, the cost of module and pack has effectively been reduced.

Description

Battery cell with directional explosion spraying device, battery unit and battery pack

Technical Field

The utility model relates to a new energy battery technical field, concretely relates to take directional electric core, battery cell and the battery package that explodes and spout the device.

Background

The soft package battery core comprises internal battery core pole pieces (positive pole pieces and negative pole pieces), a diaphragm, electrolyte, an aluminum plastic film, tabs (positive tabs and negative tabs), top seal sealant and the like. Briefly, the inside of the soft package battery cell is chemical substances, the outside is an aluminum-plastic film package with 0.12-0.15 mm, and the aluminum-plastic film generally has a three-layer structure, the inside is a package PP layer with a general thickness of 0.025-0.075 mm, the middle is an aluminum foil layer with a general thickness of 0.075-0.12 mm, and the outside is a PA protective layer with a general thickness of 0.025-0.05 mm. Since the aluminum-plastic film has weak mechanical strength and can basically bear very small pressure under the condition of thin thickness, the aluminum-plastic film is considered to be a weak material with the pressure of about 2.5 atm; moreover, since the package is formed by thermocompression bonding of the inner PP layer, the pressure that can be actually endured for a long time is smaller, and it is generally considered to be 1.5atm or less. The conditions of thermal runaway generated inside the battery cell generally include the following conditions: internal short circuit, overcharge, external short circuit, overhigh temperature, serious lithium precipitation inside the battery cell, damage to the battery cell from the outside and the like. When the inside of a soft package battery core is out of control due to various reasons, the heating temperature inside the battery core is rapidly increased in a short time, the pressure generated by gas inside the battery core is rapidly increased, the aluminum plastic film packaged by the battery core can crack in a short time due to poor strength to generally form blasting, and the strength of the aluminum plastic film at each position is basically consistent, so that the aluminum plastic film can crack or even explode at any position, directional blasting cannot be formed, and even cracking or blasting cannot be formed at a required position, namely directional blasting cannot be formed.

According to national standard GB38031, need realize controllable heat of certain degree at whole battery system level and spread even no heat at present, it is more difficult to realize to laminate polymer battery system, because electric core level all can produce the blasting in all directions, smog even flame all can be diffused in all directions and even explode and spout, this need strengthen the protection at the module level at the pack level, just can realize national standard GB38031 at the battery system level about the requirement of thermal runaway, this design development to module and pack is more difficult to realize, or, the cost of increase module pack that can show. If can realize directional exploding at electric core level and spout, module/pack only need do relevant precaution in the directional direction of exploding of soft package to need not do fire prevention in all directions and handle. Therefore, the design of the module/pack is obviously simplified, the protection requirement of the module pack for heat spreading is obviously reduced, and the cost of the module pack is obviously reduced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a realize directional explosion at electric core rank and spout, reduce the protection demand that module and pack heat spread, and then reduce the cost of module and pack, provide a take directional electric core, battery cell and the battery package that explodes and spout the device.

The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a take directional explosion-proof device's electric core, includes plastic-aluminum membrane body, blast valve, the plastic-aluminum membrane body has the electric core holding chamber of encapsulation electric core body, non-banding position on the week side of plastic-aluminum membrane body is formed with outside bellied convex closure structure, have in the convex closure structure with the assembly chamber of electric core holding chamber intercommunication, the blast valve is installed the convex closure is structural and with the assembly chamber intercommunication.

The beneficial effects of the utility model are that: the utility model discloses a set up the convex closure structure on the plastic-aluminum membrane casing of electricity core, and form the assembly chamber in the convex closure structure, structural explosion-proof valve that sets up of convex closure again, when electric core takes place the thermal runaway, the thermal runaway gas can assemble in the assembly intracavity, and then from the structural explosion-proof valve blowout of convex closure, the convex closure structure can set up the arbitrary non-banding position in plastic-aluminum membrane body week side, thereby can realize the directional blowout of inside electric core body, to a great extent simplified module and pack and wrapped the design about heat stretchs, the cost of module and pack is effectively reduced, show the reliability that has improved product heat and has spread.

The utility model provides a take directional blowout device's electric core, includes plastic-aluminum membrane body, explosion-proof valve, the plastic-aluminum membrane body has the electric core holding chamber of encapsulation electric core body, the non-banding position on the week side of electric core body is formed with inside sunken pit structure, the plastic-aluminum membrane body of pit structure and relative position department surrounds and forms the assembly chamber, explosion-proof valve install with on the plastic-aluminum membrane body of pit structure mutual disposition and with assembly chamber intercommunication.

The utility model has the advantages that: the utility model discloses a set up the pit structure on electric core body, for example set the pole piece to the special-shaped pole piece that has the recess, and form the assembly chamber in the pit structure, set up explosion-proof valve on the plastic-aluminum membrane body that corresponds again in the pit structure, when electric core takes place the thermal runaway, the thermal runaway gas can assemble the intracavity gathering, and then the explosion-proof valve that corresponds from the pit structure explodes and spouts, the pit structure can set up the arbitrary non-banding position in the all sides of plastic-aluminum membrane body, thereby can realize the directional blowout of inside electric core body, to a great extent simplified module and pack about the design that the heat stretchs, effectively reduced the cost of module and pack, show the reliability that has improved product heat and has spread.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, the explosion-proof valve is arranged on the side face where the lug of the battery cell is located; preferably, the explosion-proof valve is arranged adjacent to the tab.

The beneficial effect of adopting the further scheme is that: because the banding position of utmost point ear place side is weak relatively, takes place thermal runaway easily, sets up explosion-proof valve in utmost point ear banding position, makes thermal runaway gas can discharge from explosion-proof valve position rapidly.

Further, explosion-proof valve includes support piece and rupture membrane, support piece has the pressure release passageway, the pressure release passageway with electric core holding chamber intercommunication, the rupture membrane is fixed support piece is last and will the pressure release passageway covers completely, the structural pilot hole of having seted up of convex closure structure or pit, support piece's periphery lateral wall is fixed in the pilot hole.

The beneficial effect of adopting the further scheme is that: when the thermal runaway happens in the battery core due to various reasons, the pressure is gradually or instantly increased, the temperature is also gradually or instantly increased, the pressure relief channel of the support piece is filled with high-temperature and high-pressure gas, when the pressure reaches the pressure value set by the explosion-proof membrane, the explosion-proof membrane is cracked, and the high-temperature and high-pressure gas forms directional explosion spraying through the explosion-proof membrane.

Further, the peripheral side wall of the support member is combined in the assembly hole through injection molding, and the aluminum-plastic film body at the assembly hole is embedded in an annular groove formed in the peripheral side wall of the support member.

The beneficial effect of adopting the further scheme is that: in order to avoid unnecessary damage to the electrical core basic structure of the aluminum-plastic film and the like, the supporting piece can be made of low-temperature injection molding materials, such as PP materials and the like, and then the supporting piece is pressed at the assembling hole of the aluminum-plastic film body through low-temperature injection molding processes such as hot pressing and the like, so that the supporting piece and the aluminum-plastic film body are connected into a whole.

Further, explosion-proof valve still includes the clamping ring, the clamping ring will rupture membrane crimping is fixed support piece deviates from on the one end terminal surface in electric core holding chamber.

The beneficial effect of adopting the further scheme is that: through setting up the clamping ring, make things convenient for rupture membrane's crimping to be fixed.

Further, explosion-proof valve still includes the protection film, the protection film is fixed the rupture membrane deviates from one side in electric core holding chamber.

The beneficial effect of adopting the further scheme is that: the protection film sets up in the outermost of rupture membrane, can protect the rupture membrane, avoids appearing the outer artificial damage, and the protection film generally adopts the mode of bonding to be connected with rupture membrane or support piece's outer end terminal surface and becomes whole.

Further, the explosion-proof membrane is made of an aluminum membrane or a composite body of the aluminum membrane and polypropylene, and the thickness of the explosion-proof membrane is smaller than that of the aluminum-plastic membrane used by the aluminum-plastic membrane body.

The beneficial effect of adopting the further scheme is that: the thickness of the explosion-proof membrane is set to be smaller than that of the aluminum-plastic membrane, so that the aluminum sheet can be conveniently burst and sprayed by thermal runaway gas.

A battery unit comprises a plurality of battery cells, wherein the battery cells are stacked and arranged, and at least part of the battery cells adopt the battery cells.

The utility model has the advantages that: the utility model discloses a battery unit can realize directional explosion from electric core rank and spout, and to a great extent has simplified the design that module and pack wrapped about heat stretchs, has effectively reduced the cost of module and pack package, the improvement that is showing the reliability that product heat stretchs.

The battery pack comprises a box body and the battery unit, wherein an exhaust passage is arranged on the box body, and the explosion-proof valve is communicated with the exhaust passage in the battery pack.

Drawings

Fig. 1 is a schematic view of the structure of the soft package battery of the present invention;

FIG. 2 isbase:Sub>A partially enlarged view of the cross-sectional structure A-A of FIG. 1;

fig. 3 is a schematic diagram of a three-dimensional structure of the soft package battery of the present invention;

FIG. 4 is an enlarged view of the portion A in FIG. 3;

fig. 5 is a schematic diagram of a three-dimensional structure of the soft package battery of the present invention;

FIG. 6 is an enlarged schematic view of the portion B in FIG. 5;

fig. 7 is a schematic perspective view of the supporting member of the present invention;

fig. 8 is a schematic sectional view of the supporting member of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

100. an electric core;

1. a first aluminum plastic film body; 11. an assembly hole; 12. a battery cell accommodating cavity; 13. an assembly chamber; 14. the edge sealing position of the tab is carried out; 15. a convex hull structure;

2. a second aluminum plastic film body; 3. an explosion-proof valve; 31. a support member; 32. an explosion-proof membrane; 33. a pressure relief channel; 34. pressing a ring; 35. a protective film; 36. an annular groove; 4. a tab; 5. a cell body;

A. the width of the peripheral side surface of the first aluminum-plastic film body; B. the width of the peripheral side surface of the second aluminum plastic film body.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Example 1

As shown in fig. 1 to 8, the electrical core 100 with the directional blasting device of this embodiment includes an aluminum-plastic film body and an explosion-proof valve 3, the aluminum-plastic film body has a cell holding cavity 12 for packaging the electrical core body 5, a non-edge sealing position on the circumferential side of the aluminum-plastic film body is formed with a convex hull structure 15 protruding outward, an assembly cavity 13 communicating with the cell holding cavity 12 is provided in the convex hull structure 15, and the explosion-proof valve 3 is installed on the convex hull structure 15 and is communicated with the assembly cavity 13. The convex hull structure 15 may be at any position on the peripheral side of the packaging region of the aluminum-plastic film body, that is, at any position on the peripheral side of the entire thickness direction of the aluminum-plastic film body, and may be in a side sealing region or a top sealing region, taking fig. 1 as an example. This embodiment is through setting up the convex closure structure on the plastic-aluminum membrane casing at electric core, and form the assembly chamber in the convex closure structure, structural explosion-proof valve that sets up of convex closure again, when electric core takes place the thermal runaway, the thermal runaway gaseous gathering in the assembly intracavity, and then from the structural explosion-proof valve blowout of convex closure, the convex closure structure can set up the arbitrary non-banding position in plastic-aluminum membrane body week side, thereby can realize the directional blowout of inside electric core body, to a great extent has simplified module and pack and has covered the design about thermal spread, the cost of module and pack package has effectively been reduced, show the reliability that has improved product thermal spread.

The explosion-proof valve 3 of the embodiment can select various assembling positions according to different sealing edge forms and the arrangement positions of the pole lugs 4.

For a three-edge cell, the explosion-proof valve 3 can be arranged on one peripheral side surface of the non-edge of the three-edge cell.

And in the second explosion-proof valve assembly position, for the three-edge cell, the explosion-proof valve 3 can be arranged on the peripheral side surface where one edge sealing of the three-edge cell is located, and the edge sealing is not provided with a lug 4.

And for the three-edge-sealed battery cell, the explosion-proof valve 3 can be arranged on the peripheral side surface where one edge seal of the three-edge-sealed battery cell is located, and the edge seal is provided with a tab 4, as shown in fig. 1.

And the explosion-proof valve is assembled at the fourth position, and for the four edge-sealed battery cells, the explosion-proof valve 3 can be arranged on the peripheral side surface where one edge seal of the four edge-sealed battery cells is located, and the edge seal is not provided with a lug 4.

And the anti-explosion valve is assembled at the fifth position, and for the four-edge-sealed battery cell, the anti-explosion valve 3 can be arranged on the peripheral side surface where one edge seal of the four-edge-sealed battery cell is located, and the edge seal is provided with a lug 4.

As shown in fig. 1 and fig. 2, in a preferred embodiment of the present invention, the explosion-proof valve 3 is disposed on a side surface of the battery cell 100 where the tab 4 is located; further preferably, the explosion-proof valve 3 is arranged adjacent to the tab 4. Because the edge sealing position of the side face where the pole lug is located is relatively weak, thermal runaway is easy to occur, and the explosion-proof valve is arranged at the pole lug edge sealing position 14, so that thermal runaway gas can be rapidly discharged from the position of the explosion-proof valve.

Another preferred scheme of this embodiment is that, as shown in fig. 2, the aluminum-plastic film body may be divided into a first aluminum-plastic film body 1 and a second aluminum-plastic film body 2 located on two sides of the plane where the sealing edge is located according to the plane where the sealing edge is located, the first aluminum-plastic film body 1 and the second aluminum-plastic film body 2 are mutually buckled to form the electrical core accommodating cavity 12, the width a of the circumferential side surface of the first aluminum-plastic film body 1 is greater than the width B of the circumferential side surface of the second aluminum-plastic film body 2, and the explosion-proof valve 3 is disposed on the circumferential side surface of the first aluminum-plastic film body 1. The explosion-proof valve is arranged on the aluminum-plastic film shell on one side with a wider width, so that the explosion-proof valve has enough installation space, and the interference of the sealing edge of the aluminum-plastic film body is avoided. Further, if the width of the second aluminum-plastic film body 2 is small enough, that is, there is only one thickness of the aluminum-plastic film body, as shown in fig. 2, that is, the sealing edge is on one side of the whole cell, that is, the thickness of the whole cell is left for assembling the explosion-proof valve.

The explosion-proof valve 3 of the embodiment can adopt an explosion-proof valve with any structure in the prior art, and only pressure relief can be realized. The embodiment also provides a preferable scheme of the explosion-proof valve 3, which is as follows.

As shown in fig. 2 and fig. 4 to 8, the explosion-proof valve 3 includes a support member 31 and an explosion-proof membrane 32, the support member 31 has a pressure relief channel 33, the pressure relief channel 33 is communicated with the cell accommodating cavity 12, the explosion-proof membrane 32 is fixed on the support member 31 and completely covers the pressure relief channel 33, assembly holes 11 are formed in the convex hull structure and the concave pit structure, and the peripheral side wall of the support member 31 is fixed in the assembly holes 11. When the thermal runaway happens in the battery core due to various reasons, the pressure is gradually or instantly increased, the temperature is also gradually or instantly increased, the pressure relief channel of the support piece is filled with high-temperature and high-pressure gas, when the pressure reaches the pressure value set by the explosion-proof membrane, the explosion-proof membrane is cracked, and the high-temperature and high-pressure gas forms directional explosion spraying through the explosion-proof membrane.

Optionally, the rupture membrane 32 may be disposed in the assembly cavity 13 inside the aluminum-plastic film body, or may be disposed on the support member 31 outside the aluminum-plastic film body, and both functions of directional pressure relief can be achieved.

As shown in fig. 5 to 8, the outer peripheral side wall of the support member 31 is coupled to the fitting hole 11 by injection molding, and the aluminum plastic film body at the fitting hole 11 is fitted into the annular groove 36 formed in the outer peripheral side wall of the support member 31. In order to avoid unnecessary damage to the electrical core foundation structure such as the aluminum-plastic film, the supporting piece can be made of low-temperature injection molding materials such as PP materials, and then the supporting piece is pressed at the assembling hole of the aluminum-plastic film body through low-temperature injection molding processes such as hot pressing, so that the supporting piece and the aluminum-plastic film body are connected into a whole. The low-temperature injection molding process adopts conventional battery edge fixing process equipment, the part of the aluminum-plastic film body is placed into a mold, and the support piece is formed at low temperature and then combined with the aluminum-plastic film body.

Further, as shown in fig. 2 and fig. 6, the explosion-proof valve 3 further includes a pressing ring 34, and the pressing ring 34 fixes the explosion-proof membrane 32 on an end surface of the supporting member 31 away from the battery cell accommodating cavity 12 in a crimping manner. Through setting up the clamping ring, make things convenient for rupture membrane's crimping to be fixed.

Preferably, in order to protect the rupture disk 32, as shown in fig. 2 and 6, the explosion-proof valve 3 further includes a protective film 35, and the protective film 35 is fixed on a side of the rupture disk 32 facing away from the cell accommodating cavity 12. The protection film sets up in the outermost of rupture membrane, can protect the rupture membrane, avoids appearing the outer artificial destruction, and the protection film generally adopts the mode of bonding to become whole with rupture membrane or support piece's outer end terminal surface connection.

The protective film 35 of the present embodiment can be a thermoplastic plastic film, such as PE material, which can be melted rapidly when thermal runaway occurs.

Specifically, the rupture membrane 32 of this embodiment is thermally pressed and compounded on the supporting member 31, the rupture membrane 32 is made of an aluminum membrane or a composite of the aluminum membrane and polypropylene, and the thickness of the rupture membrane 32 is smaller than that of an aluminum-plastic membrane used for preparing the aluminum-plastic membrane body. The aluminum plastic film is formed by compounding polypropylene (PP), polyamide (PA) and an aluminum film. The thickness of the explosion-proof membrane is set to be smaller than that of the aluminum-plastic membrane, the explosion-proof membrane is a weak area, the pressure born by the explosion-proof membrane is smaller than the strength of the aluminum-plastic membrane, when the internal pressure of the battery cell reaches the limit of the explosion-proof membrane, the explosion-proof membrane is cracked and exploded, high-temperature high-pressure gas or substances are sprayed out from an explosion-proof opening to form explosion, and directional explosion in the direction and position is carried out after explosion. And the cracking explosion-proof pressure value of the explosion-proof membrane can be set, different thicknesses can be set, and different cracking explosion-proof pressure effects are achieved.

Further, the thickness of the explosion-proof membrane 32 is 0.02-0.03 mm, and the thickness of the aluminum plastic membrane is 0.075-0.12 mm. Specifically, the thickness of the explosion-proof membrane 32 can be selected to be 0.02mm, 0.022mm, 0.024mm, 0.026mm, 0.027mm and 0.03mm, and the thickness of the aluminum plastic membrane can be selected to be 0.075mm, 0.078mm, 0.08mm, 0.085mm, 0.09mm, 0.095mm, 0.01mm and 0.12mm.

Specifically, the shape of the pressure relief channel 33 in this embodiment may be set arbitrarily, for example, a circular channel, an oval channel, a square channel, an irregular channel, etc. may be adopted, and correspondingly, the shapes of the explosion-proof membrane 32, the protective membrane 35, and the pressing ring 34 may also be a circle, an oval, a square, an irregular shape, etc.

The directional electric core that explodes of this embodiment spouts device, because all kinds of reasons when electric core is inside, pressure is gradually or increase in the twinkling of an eye, and the temperature also can be gradually or increase in the twinkling of an eye, and high temperature high-pressure other are full of at plastic support piece's pressure release passageway, and when pressure reached the pressure value that the rupture membrane set for, the rupture membrane fracture, high temperature high pressure gas passes through the rupture membrane, melts outside protection film fast, and high temperature high pressure gas forms the blasting. The embodiment can carry out directional blowout from the electric core level, especially to soft-packaged electric core, under the inside thermal runaway's of electric core condition, can realize the eruption in specific direction through the explosion-proof valve, erupts high temperature high pressure material in the specific area of specific direction for soft-packaged electric core's thermal runaway can better prevention and control.

Example 2

The electric core of directional blowout device in area of this embodiment, including plastic-aluminum membrane body, blast valve 3, the plastic-aluminum membrane body has the electric core holding chamber 12 of encapsulation electric core body 5, the non-banding position on the week side of electric core body 5 is formed with inside sunken pit structure, the plastic-aluminum membrane body of pit structure and relative position department surrounds formation assembly chamber 13, blast valve 3 install with on the plastic-aluminum membrane body of pit structure relative arrangement and with assembly chamber 13 intercommunication.

This embodiment is through setting up the pit structure on electric core body, for example set the pole piece to the special-shaped pole piece that has the recess, and form the assembly chamber in pit structure, set up explosion-proof valve on the plastic-aluminum membrane body that the pit structure corresponds again, when electric core takes place the thermal runaway, thermal runaway gas can assemble the intracavity gathering, and then from the explosion-proof valve blowout of pit structure correspondence, the pit structure can set up the arbitrary non-banding position in plastic-aluminum membrane body week side, thereby can realize the directional blowout of inside electric core body, to a great extent has simplified the design that module and pack stretch about heat, the cost of module and pack package has effectively been reduced, show the reliability that has improved product thermal stretch.

In this embodiment, the setting position and the setting structure of the explosion-proof valve can refer to those described in embodiment 1, and are not described herein again.

Example 3

The present embodiment provides a battery unit, which includes a plurality of battery cells, where the plurality of battery cells are stacked and arranged, and at least a portion of the battery cells adopt the battery cells of the foregoing embodiment 1 or/and embodiment 2. The battery unit can be a laminated structure formed by stacking a plurality of battery cores and also can be directly set into a battery module. If have the electric core in a plurality of above-mentioned embodiments in the battery module, the explosion-proof valve 3's of a plurality of electric cores the arrangement position set up in same position and orientation can be towards same direction, like this, conveniently sets up corresponding pressure release structure on battery module and subsequent battery package. Of course, the arrangement positions of the explosion-proof valves 3 of a plurality of cells can be set at different positions according to needs, and the orientation can also be set in a required direction according to needs.

The embodiment also provides a battery pack, which comprises a box body and the battery unit, wherein the box body is provided with an exhaust channel, and the explosion-proof valve 3 is communicated with the exhaust channel in the battery pack.

The battery unit and the battery package of this embodiment can realize directional explosion from electric core level, and to a great extent has simplified the design that module and pack were wrapped about heat is stretchd, has effectively reduced the cost of module and pack, the improvement that is showing that product heat stretchs reliability.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be directly contacting the second feature or the first and second features may be indirectly contacting the second feature through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (11)

1. The utility model provides an electric core of directional blowout device in area, its characterized in that, includes plastic-aluminum membrane body, explosion-proof valve (3), the plastic-aluminum membrane body has electric core holding chamber (12) of encapsulation electric core body (5), non-banding position on the week side of plastic-aluminum membrane body is formed with outside bellied convex closure structure (15), have in convex closure structure (15) with assembly chamber (13) of electric core holding chamber (12) intercommunication, explosion-proof valve (3) are installed on convex closure structure (15) and with assembly chamber (13) intercommunication.

2. The utility model provides an electric core of directional blowout device in area, its characterized in that, includes plastic-aluminum membrane body, blast valve (3), the plastic-aluminum membrane body has electric core holding chamber (12) of encapsulation electric core body (5), non-banding position on the week side of electric core body (5) is formed with inside sunken pit structure, the plastic-aluminum membrane body of pit structure and relative position department surrounds formation assembly chamber (13), blast valve (3) install with on the plastic-aluminum membrane body of pit structure relative arrangement and with assembly chamber (13) intercommunication.

3. The battery cell with the directional blasting device according to any one of claims 1 or 2, wherein the anti-explosion valve (3) is arranged on the side surface of the battery cell where the tab (4) is located.

4. The battery cell with the directional blowout device according to claim 3, wherein the explosion-proof valve (3) is arranged adjacent to the tab (4).

5. The battery cell with the directional blowout device according to any one of claims 1 or 2, wherein the explosion-proof valve (3) comprises a support member (31) and an explosion-proof membrane (32), the support member (31) has a pressure relief channel (33), the pressure relief channel (33) is communicated with the cell accommodating cavity (12), the explosion-proof membrane (32) is fixed on the support member (31) and completely covers the pressure relief channel (33), the convex hull structure or the concave hull structure is provided with an assembly hole (11), and a peripheral side wall of the support member (31) is fixed in the assembly hole (11).

6. The electric core with the directional bursting device as claimed in claim 5, wherein the peripheral side wall of the support member (31) is integrated in the assembly hole (11) by injection molding, and the aluminum plastic film body at the assembly hole (11) is embedded in an annular groove (36) formed on the peripheral side wall of the support member (31).

7. The battery cell with the directional bursting device according to claim 5, wherein the bursting valve (3) further comprises a pressing ring (34), and the pressing ring (34) fixes the bursting diaphragm (32) in a pressing manner on an end face of the supporting member (31) away from the cell accommodating cavity (12).

8. The battery cell with the directional bursting device according to claim 5, wherein the bursting valve (3) further comprises a protection film (35), and the protection film (35) is fixed on the side of the bursting film (32) departing from the battery cell accommodating cavity (12).

9. The electric core with the directional blasting device according to claim 5, wherein the rupture membrane (32) is made of an aluminum membrane or a composite of the aluminum membrane and polypropylene, and the thickness of the rupture membrane (32) is smaller than that of the aluminum-plastic membrane used for the aluminum-plastic membrane body.

10. A battery unit comprising a plurality of cells arranged in a stack, at least some of the cells being formed from cells according to any of claims 1 to 9.

11. A battery pack, characterized by comprising a case and the battery unit of claim 10, wherein the case is provided with an exhaust passage, and the explosion-proof valve (3) is communicated with the exhaust passage in the battery pack.

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