CN218182409U - But utmost point post subassembly, battery top cap and power battery of pressure release - Google Patents
But utmost point post subassembly, battery top cap and power battery of pressure release Download PDFInfo
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- CN218182409U CN218182409U CN202221122655.2U CN202221122655U CN218182409U CN 218182409 U CN218182409 U CN 218182409U CN 202221122655 U CN202221122655 U CN 202221122655U CN 218182409 U CN218182409 U CN 218182409U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model particularly relates to a utmost point post subassembly, battery top cap and power battery that can discharge, utmost point post unit mount are on the apron, and utmost point post subassembly includes utmost point post body and encircles the connecting piece of parcel at utmost point post body cylinder, connecting piece and utmost point post body fixed connection, and the connecting piece includes main part and the weak part that is used for the pressure release, and weak part sets up in the main part, during the utmost point post through-hole on the main part embedding apron to with apron sealing connection. When the battery takes place thermal runaway, the weak part that the connecting piece of utmost point post subassembly set up can be broken through or high temperature melts and wears by atmospheric pressure, make utmost point post body break away from the apron, and then make utmost point post through-hole switch on and form exhaust passage, the inside gas of battery is discharged from utmost point post through-hole, consequently need not set up explosion-proof valve again and be used for the pressure release, owing to need not set up explosion-proof valve, the area of utmost point post through-hole obtains promoting, the exhaust velocity who makes utmost point post through-hole accelerates, explosion-proof valve part has been reduced simultaneously, production efficiency and goodness have been promoted.
Description
Technical Field
The utility model belongs to the technical field of battery production manufacturing, concretely relates to utmost point post subassembly, battery top cap and power battery that can let out pressure.
Background
With the coming of the information-oriented high-tech era, the application form of energy is changing, and the demand of renewable, pollution-free, small and discrete mobile high-performance power sources is rapidly increasing. Green and high-efficiency secondary batteries are being vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.
At present, an explosion-proof sheet formed by stamping special aluminum materials in the industry is welded to a cover plate of a lithium ion battery or an aluminum shell through hole by laser to be used as an explosion-proof valve, and the explosion pressure is controlled by notches punched on the explosion-proof sheet. Such explosion-proof valves are usually arranged separately from the pole, occupying the head cover space. When the battery seal size is less, when utmost point post occupation space is big, the area of reserving for the explosion-proof piece is little, and exhaust rate is slow, probably leads to the battery explosion disintegration when taking place the thermal runaway, and the explosion-proof piece area is little simultaneously means the specification of same blasting atmospheric pressure, and the residual thickness of explosion-proof piece nick is little, and is higher to the requirement of punching press precision, and production efficiency and goodness are low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an: to prior art not enough, provide a utmost point post subassembly, battery top cap and the power battery that can discharge, through set up weak part at utmost point post subassembly, carry out the pressure release when the battery takes place thermal runaway, weak part can be broken through or be melted through by high temperature by atmospheric pressure, makes utmost point post break away from the lid board, and then makes utmost point post through-hole switch on, and gas can follow utmost point post through-hole and release pressure, because the area of utmost point post through-hole is big, therefore exhaust speed is fast.
In order to realize the purpose, the utility model adopts the following technical scheme:
in a first aspect, the application discloses can leak utmost point post subassembly of pressure installs on the apron, utmost point post subassembly includes utmost point post body and encircles the parcel and be in the connecting piece of utmost point post body cylinder, the connecting piece with utmost point post body fixed connection, the connecting piece includes the main part and is used for the weak part of pressure release, weak part set up in the main part, the main part embedding in the utmost point post through-hole on the apron, and with apron sealing connection.
Optionally, the connecting member has a first surface and a second surface opposite to the first surface; the plane of the first surface at the weakened portion is lower than the plane of the first surface at the main body portion, and/or the plane of the second surface at the weakened portion is lower than the plane of the second surface at the main body portion.
Optionally, the main part includes first components and second components, first components centers on the setting of utmost point post body, the second components centers on first components sets up, just weak portion sets up first components with between the second components, first components the second components with weak portion integrated into one piece, first components is used for fixed connection utmost point post body, the second components is used for fixed connection the apron.
Optionally, any one of the first split part and the post body is provided with a first convex part, the other one of the first split part and the post body is provided with a first concave part, and the first convex part is in concave-convex fit with the first concave part; and/or any one of the second split part and the cover plate is provided with a second convex part, the other one of the second split part and the cover plate is provided with a second concave part, and the second convex part is in concave-convex fit with the second concave part.
Optionally, the weak portion is disposed around the center of the post body and located outside the first split portion and inside the second split portion, wherein the weak portion is an annular groove.
Optionally, the connecting piece further includes a reinforcing portion, the reinforcing portion is disposed on the main body portion and/or the weak portion, and the reinforcing portion is used for reinforcing the structural strength of the pole assembly.
In a second aspect, the present application further discloses a battery top cover, which comprises a cover plate and a first aspect, wherein the pole assemblies are arranged on the cover plate at two intervals.
Optionally, a liquid injection port is further formed in the cover plate, and the liquid injection port is located between the two pole assemblies.
In a third aspect, the application further discloses a power battery, which includes a battery core, a casing and the battery top cover of the second aspect, wherein the battery core is accommodated in the casing, and the cover plate in the battery top cover is hermetically connected with the casing.
Optionally, the ratio of the area of the pole through hole to the capacity of the power battery ranges from 200 mm to 2500mm 2 :100Ah。
The utility model discloses at least, following beneficial effect has:
this application sets up weak part at utmost point post subassembly's connecting piece, when the battery takes place thermal runaway, weak part can be broken through or high temperature melten through by atmospheric pressure, make utmost point post body break away from the apron, and then make utmost point post through-hole switch on and form exhaust passage, the inside gaseous follow utmost point post through-hole of battery discharges, consequently, need not set up explosion-proof valve again and be used for the pressure release, simultaneously because need not set up explosion-proof valve, consequently, the area of utmost point post through-hole can obtain promoting, the exhaust velocity who makes utmost point post through-hole also obtains corresponding promotion, and owing to need not set up explosion-proof valve, consequently, need not carry out the nick to explosion-proof piece again, the parts have been reduced simultaneously, production efficiency and goodness have been promoted.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic perspective view of a pole assembly according to an embodiment of the present invention.
Fig. 2 is an exploded view of the three-dimensional structure of the pole assembly according to the embodiment of the present invention.
Fig. 3 is a schematic structural view of a pole assembly according to an embodiment of the present invention.
Fig. 4 is a schematic perspective view of a battery top cover according to an embodiment of the present invention.
Fig. 5 is a schematic perspective view of a cover plate according to an embodiment of the present invention.
Fig. 6 is a schematic structural view of a battery top cover according to an embodiment of the present invention.
Fig. 7 is an exploded view of the battery top cover according to the embodiment of the present invention.
Fig. 8 is a schematic perspective view of a power battery according to an embodiment of the present invention.
Wherein the reference numerals are as follows:
1-pole assembly; 11-pole body; 12-a connector; 121-a body portion; 1211 — a first split portion; 1212-a second split; 122-a weakening; 123-a reinforcement;
2-cover plate; 21-pole through hole; 22-a liquid injection port;
3-a shell;
4-electric core; 41-a body portion; 42-a first tab; 43-a second tab;
51-a first convex portion; 52-a first recess; 53-a second projection; 54-second recess.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
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.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may include, for example, fixed connections, detachable connections, or integral connections; 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 according to specific situations by those of ordinary skill in the art.
The following examples are further detailed with reference to fig. 1 to 8, but are not intended to limit the present invention.
As shown in fig. 1 to 7, the pole assembly 1 capable of releasing pressure in the embodiment of the present application is installed on the power battery cover plate 2, the pole assembly 1 includes the pole body 11 and the connecting piece 12 wrapped around the cylindrical surface of the pole body 11, the connecting piece 12 is fixedly connected with the pole body 11, the connecting piece 12 includes a main body portion 121 and a weak portion 122 for releasing pressure, the weak portion 122 is arranged on the main body portion 121, and the main body portion 121 is embedded in the pole through hole 21 on the cover plate 2 and is hermetically connected with the cover plate 2.
The embodiment of the application sets up weak part 122 at connecting piece 12 of utmost point post subassembly 1, when the battery takes place thermal runaway, weak part 122 can be broken through or high temperature melts by atmospheric pressure, make utmost point post body 11 break away from apron 2, and then make utmost point post through-hole 21 switch on and form exhaust passage, the inside gas of battery is discharged from utmost point post through-hole 21, consequently, need not set up explosion-proof valve again and be used for the pressure release, simultaneously because need not set up explosion-proof valve, consequently, the area of utmost point post through-hole 21 can obtain the promotion, the exhaust velocity that makes utmost point post through-hole 21 also obtains corresponding promotion, and owing to need not setting up explosion-proof valve, consequently, need not carry out the nick to explosion-proof piece again, the part has been reduced simultaneously, production efficiency and goodness have been promoted.
In an alternative embodiment of the present application, the connecting member 12 has a first surface and a second surface opposite to the first surface; the first surface is lower at the plane of the weakened portion 122 than the first surface is at the plane of the body portion 121, and/or the second surface is lower at the plane of the weakened portion 122 than the second surface is at the plane of the body portion 121.
Specifically, after the pole post assembly 1 is assembled to the battery, one side of the connecting member 12 away from the battery cell 4 is a first surface, and one side of the connecting member 12 close to the battery cell 4 is a second surface.
The plane of the first surface at the weakened portion 122 is lower than the plane of the first surface at the main body portion 121, that is, the weakened portion 122 is a recessed structure, and the weakened portion 122 is recessed at the first surface.
The plane of the second surface at the weakened portion 122 is lower than the plane of the second surface at the main body portion 121, that is, the weakened portion 122 is a recessed structure, and the weakened portion 122 is recessed at the second surface.
The plane of the first surface at the weakened portion 122 is lower than the plane of the first surface at the main body portion 121 and the plane of the second surface at the weakened portion 122 is lower than the plane of the second surface at the main body portion 121, i.e. the weakened portion 122 is a recessed structure, and the weakened portion 122 is recessed at both the first surface and the second surface.
The connecting member 12 may be made of a metal material, such as aluminum, and formed by welding, or the connecting member 12 may be made of a non-metal material, such as PPS plastic, and formed by injection molding. The weakened portion 122 of the connector 12 may be formed by laser etching or may be integrally formed during injection molding.
By making the first surface lower than the first surface at the plane of the weak portion 122 at the plane of the main body portion 121 and/or making the second surface lower than the second surface at the plane of the weak portion 122 at the plane of the main body portion 121, the thickness of the weak portion 122 is made smaller than the thickness of the main body portion 121, thereby reducing the structural strength of the connecting member 12 at the weak portion 122, when thermal runaway occurs in the battery, the weak portion 122 can be more easily broken by the pressure inside the battery due to the reduction in the structural strength of the weak portion 122, or at high temperatures, the weak portion 122 can be quickly melted through because the thickness of the weak portion 122 is thinner than the thickness of the main body portion 121. Wherein, when the depth of the recess structure is the same, the weak portion 122 is recessed on both the first surface and the second surface, and the burst timeliness of the weak portion 122 is the best.
In an alternative embodiment of the present application, the main body portion 121 includes a first body portion 1211 and a second body portion 1212, the first body portion 1211 is disposed around the pole body 11, the second body portion 1212 is disposed around the first body portion 1211, the weak portion 122 is disposed between the first body portion 1211 and the second body portion 1212, the first body portion 1211, the second body portion 1212 and the weak portion 122 are integrally formed, the first body portion 1211 is configured to be fixedly connected to the pole body 11, and the second body portion 1212 is configured to be fixedly connected to the cover plate 2.
Specifically, the main body 121 is configured to include a first body portion 1211 and a second body portion 1212, the first body portion 1211 is configured to surround the post body 11 and is fixedly connected to the post body 11, so that the post body 11 and the connector 12 can be tightly connected, the second body portion 1212 is configured to surround the first body portion 1211 and is fixedly connected to the cover plate 2, so that the cover plate 2 and the connector 12 can be tightly connected, the weak portion 122 is configured between the first body portion 1211 and the second body portion 1212, and the three portions are integrally formed, that is, the first body portion 1211 and the second body portion 1212 are connected together through the weak portion 122 to form a whole, so that the connector 12 can fixedly connect the post body 11 to the cover plate 2, and the weak portion 122 is configured between the first body portion 1211 and the second body portion 1212 for pressure relief, if the weak portion 122 is configured between the first body portion 1211 and the second body portion 1212, if the position of the weak portion 122 and the first body portion is replaced, the structural strength of the connection structure between the connector 12 and the post body 11 is reduced, and the sealing performance is easily reduced if the weak portion 122 is removed from the cover plate 2, and the connection assembly is easily removed from the cover plate 1212.
In an alternative embodiment of the present application, either one of the first body portion 1211 and the post body 11 is provided with a first convex portion 51, the other one of the first body portion 1211 and the post body 11 is provided with a first concave portion 52, and the first convex portion 51 is in concave-convex fit with the first concave portion 52; and/or any one of the second split portion 1212 and the cover plate 2 is provided with a second convex portion 53, the other one of the second split portion 1212 and the cover plate 2 is provided with a second concave portion 54, and the second convex portion 53 and the second concave portion 54 are in concave-convex fit.
Specifically, one of the first body portion 1211 and the post body 11 is provided with a first convex portion 51, the other of the first body portion 1211 and the post body 11 is provided with a first concave portion 52, and the first convex portion 51 is in concave-convex fit with the first concave portion 52, and the structure includes: the first split 1211 is provided with a first convex part 51, the pole body 11 is provided with a first concave part 52, and the first concave part 52 is in concave-convex fit with the first convex part 51; the pole body 11 is provided with a first convex portion 51, the first body portion 1211 is provided with a first concave portion 52, and the first concave portion 52 is in concave-convex fit with the first convex portion 51. Through the concave-convex fit arrangement of the first convex portion 51 and the first concave portion 52, not only is the connection area of the connection structure between the first body portion 1211 and the post body 11 increased, but also the concave-convex fit arrangement of the first convex portion 51 and the first concave portion 52 enables the first body portion 1211 and the post body 11 to form a clamping connection, the connection strength of the first body portion 1211 and the post body 11 is further enhanced, and the connection strength of the first body portion 1211 and the post body 11 is enhanced, so that the connection member 12 and the post body 11 are enhanced.
Specifically, any one of the second body portion 1212 and the cap plate 2 is provided with a second protrusion 53, the other one of the second body portion 1212 and the cap plate 2 is provided with a second recess 54, and the second protrusion 53 and the second recess 54 are in concave-convex fit, and the above structure includes: the second split portion 1212 is provided with a second convex portion 53, the cover plate 2 is provided with a second concave portion 54, and the second convex portion 53 is in concave-convex fit with the second concave portion 54; the cover plate 2 is provided with a second convex portion 53, the second divided portion 1212 is provided with a second concave portion 54, and the second convex portion 53 is in concave-convex fit with the second concave portion 54. Through the concave-convex cooperation setting of second convex part 53 and second concave part 54, not only increased the connection area of the connection structure between second part 1212 and apron 2, the concave-convex cooperation of second convex part 53 and second concave part 54 simultaneously can make and form the joint between second part 1212 and apron 2, further strengthen the joint strength of second part 1212 and apron 2, because the joint strength of second part 1212 and apron 2 is strengthened, and then can make the joint strength of connecting piece 12 and apron 2 strengthen, also make the joint strength of utmost point post subassembly 1 and apron 2 strengthen.
Preferably, in the embodiment of the present application, the first convex portion 51 is provided in the first split portion 1211, the first concave portion 52 is provided in the pole body 11, the second convex portion 53 is provided in the second split portion 1212, and the second concave portion 54 is provided in the lid plate 2. Through the setting, the connection strength between the connecting piece 12 and the pole body 11 and the cover plate 2 is increased, and the pole body 11 can be prevented from deforming.
In an alternative embodiment of the present application, the weak portion 122 is disposed around the center of the pole body 11 and located outside the first split portion 1211 and inside the second split portion 1212, wherein the weak portion 122 is an annular groove.
Specifically, by disposing the weak portion 122 around the center of the electrode body 11 and locating outside the first body portion 1211 and inside the second body portion 1212, when thermal runaway occurs in the battery, the weak portion 122 is broken or melted through, so that the electrode body 11 falls off from the cover plate 2 at the first body portion 1211, and an exhaust channel is formed for exhausting gas inside the battery, and the formed exhaust channel can reach the maximum. The weak portion 122 is provided as an annular groove, so that the weak portion 122 is thinner than the main body portion 121 and is more easily broken by air pressure or melted through at high temperature.
In an alternative embodiment of the present application, the connecting member 12 further includes a reinforcing portion 123, the reinforcing portion 123 is disposed on the main body portion 121 and/or the weak portion 122, and the reinforcing portion 123 is used for reinforcing the structural strength of the pole assembly 1.
It should be noted that the reinforcing portion 123 of the present application is a rib, and the rib is provided to protrude from the first surface and/or the second surface. That is, when the reinforcing ribs are provided at the weak portions 122, they may be dot-shaped protrusions uniformly arranged in the annular groove. The reinforcing ribs may be uniformly arranged strip-shaped protrusions when disposed on the main body portion 121. When the reinforcing ribs are disposed on the main body 121 and the weak portion 122, the reinforcing ribs may be uniformly arranged strip-shaped protrusions, and have cross nodes with the annular grooves of the weak portion 122.
Specifically, since the weak portion 122 is provided in the connector 12, the pole assembly 1 is prevented from being deformed in order to secure the strength of the connector 12, and therefore, the structural strength of the connector 12 can be enhanced by providing the reinforcing portion 123 in the main body portion 121 and/or the weak portion 122.
As shown in fig. 4 to 7, the battery top cap of the embodiment of the present application includes a cover plate 2 and the terminal post assemblies 1 of the above embodiments, and two terminal post assemblies 1 are disposed on the cover plate 2 at intervals.
Specifically, the cover plate 2 is provided with two pole through holes 21, and the pole assembly 1 is arranged at the positions of the two pole through holes 21.
Wherein, two utmost point post subassemblies 1 on the battery top cap are positive post subassembly 1 one, and another is negative pole post subassembly 1, and the difference between them lies in that the material that utmost point post body 11 in positive post subassembly 1 used is different with the material that utmost point post body 11 of negative pole post subassembly 1 used, and the material that utmost point post body 11 of negative pole post subassembly 1 used is copper or copper aluminium combined material, and the position that is in battery case 3 on the utmost point post body 11 promptly is the copper product to reduce negative pole electrochemical corrosion.
The battery top cap of this application embodiment is through using the utmost point post subassembly 1 of above-mentioned embodiment, consequently need not set up the explosion-proof hole of explosion-proof valve at apron 2, and then can increase utmost point post through-hole 21's area, through the area of increase utmost point post through-hole 21, when the battery takes place thermal runaway, can be faster with the inside gas outgoing of battery, apron 2 is provided with two utmost point post through-holes 21 simultaneously, consequently can further improve exhaust velocity.
In an alternative embodiment of the present application, the cover plate 2 is further provided with a liquid injection port 22, and the liquid injection port 22 is located between the two pole assemblies 1.
Specifically, annotate liquid mouth 22 including annotating the liquid hole, annotate the liquid hole and be used for to 3 inside injected electrolyte of battery case, will annotate liquid mouth 22 and set up between two utmost point posts for can be quick even infiltration electric core 4 through annotating the electrolyte that the liquid hole was annotated, if will annotate the region of liquid mouth 22 setting outside between two utmost point post subassemblies 1, then can not be quick even infiltration electric core 4 through annotating the electrolyte that the liquid hole was annotated, and the side of electric core 4 to another side need be followed to electrolyte promptly, and the influence is annotated liquid efficiency. Meanwhile, the cover plate 2 is provided with the explosion-proof valve, so that the area of the liquid injection port 22 can be correspondingly increased, and the liquid injection speed is increased.
Optionally, the liquid injection port 22 further includes an air exhaust hole for evacuating and pressurizing the inside of the battery case 3. Through will annotating liquid mouth 22 and set up to annotate liquid hole and aspirating hole to the passageway that will annotate liquid and ventilate separates, makes annotate the liquid and can go on in step with bleeding/pressurization, is favorable to improving battery and annotates liquid efficiency. Furthermore, annotate the liquid hole and have two, the aspirating hole has one and is located two and annotates the liquid hole centre.
As shown in fig. 8, the power battery according to the embodiment of the present application includes a battery cell 4, a casing 3, and the above-mentioned battery top cover, where the battery cell 4 is accommodated in the casing 3, and a cover plate 2 in the battery top cover is hermetically connected to the casing 3.
Specifically, the battery cell 4 includes a first pole piece, a second pole piece, and a spacer, where the spacer is used to separate the first pole piece from the second pole piece. The first and second pole pieces have opposite polarities, that is, one of the first and second pole pieces is a positive pole piece, and the other of the first and second pole pieces is a negative pole piece.
Optionally, the first pole piece, the second pole piece and the spacer are all in a belt-shaped structure, and the first pole piece, the second pole piece and the spacer are wound into a whole and form a winding structure. The coiled structure may be a cylindrical structure, a flat structure, or other shaped structure.
Optionally, the first pole piece, the second pole piece, and the separator are all in a belt-shaped structure, and the first pole piece, the separator, and the second pole piece are sequentially stacked to form a stacked structure. The laminated structure may be a cylindrical structure, a flat structure, or a structure of other shape.
The battery cell 4 includes a body portion 41, a first tab 42, and a second tab 43, and the first tab 42 and the second tab 43 protrude from the body portion 41 when viewed from the external shape of the battery cell 4. The body 41 is composed of a first pole piece, a second pole piece and a separator, wherein a first tab 42 is led out for the first pole piece, and a second tab 43 is led out for the second pole piece. Correspondingly, one of the first tab 42 and the second tab 43 is a tab with positive polarity, and the other is a tab with negative polarity.
The first tab 42 and the second tab 43 may extend from the same side of the body portion 41, or may extend from opposite sides.
Illustratively, the first tab 42 and the second tab 43 are provided on the same side of the body portion 41, in other words, the first tab 42 and the second tab 43 are provided on the same end of the battery cell 4. Optionally, a first tab 42 and a second tab 43 are located at one end of the electric core 4 facing the cover plate 2, the first tab 42 is a positive tab and is electrically connected to the post body 11 of the positive post assembly 1, and the second tab 43 is a negative tab and is electrically connected to the post body 11 of the negative post assembly 1.
Specifically, the housing 3 includes a side wall surrounding an edge of the bottom wall, and a bottom wall connected to an end of the side wall. The side wall is a square tubular structure, the bottom wall is a plate-shaped structure, and the shape of the bottom wall corresponds to that of the side wall.
Optionally, one end of the side wall forms an opening, and the bottom wall is connected to the other end of the side wall facing away from the opening. The side walls and the bottom wall may be of integrally formed construction, i.e. the housing 3 is an integrally formed member. Of course, the side wall and the bottom wall may also be two members provided separately and then joined together by welding, riveting, bonding, or the like.
The opening of casing 3 is covered to apron 2 lid of this application embodiment, and apron 2 seals with casing 3 through laser welding and forms the sealed chamber that is used for holding electric core 4. Power battery has adopted foretell battery top cap for power battery is when taking place thermal runaway, and utmost point post subassembly 1 can in time open utmost point post through-hole 21 and form pressure release channel, with the inside gas outgoing of power battery, simultaneously, because utmost point post subassembly 1 can be used for the pressure release, therefore power battery need not set up explosion-proof valve again, has reduced part and manufacturing procedure, has reduced manufacturing cost, has promoted production efficiency.
In an optional embodiment of the present application, the ratio of the area of the pole through hole 21 to the capacity of the power battery ranges from 200 mm to 2500mm 2 :100Ah。
The inventor tests that when batteries with different chemical systems generate different types of thermal runaway, the gas generation rate is about 7-90L/s/100Ah, the ratio of the area of the pole through-hole 21 to the battery capacity is set to 200 to 2500mm in the embodiment of the present application 2 100Ah, the pole through hole 21 is arranged, so that even if the battery is out of control thermally, the highest gas discharging and generating speed in the battery is achieved under the capacity, the gas discharging speed of the pole through hole 21 is still larger than or equal to the gas generating speed, and the gas is not retained in the battery to increase the internal pressure of the battery.
It should be noted that the shape of the pole through hole 21 is not particularly limited in the present application, and for example, the shape of the pole through hole 21 may be square, and accordingly, the outer contour of the connector 12 inserted into the pole through hole 21 is also square. It is understood that the shape of the post through-hole 21 may also be other shapes such as a circle, a rhombus, a trapezoid, etc., as long as the range of the ratio of the area of the post through-hole 21 to the battery capacity is the above-mentioned range.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a can leak utmost point post subassembly of pressure, installs on apron (2), its characterized in that, include utmost point post body (11) and encircle the parcel and be in connecting piece (12) of utmost point post body (11) cylinder, connecting piece (12) with utmost point post body (11) fixed connection, connecting piece (12) include main part (121) and be used for the weak part (122) of pressure release, weak part (122) set up in main part (121), main part (121) embedding in utmost point post through-hole (21) on apron (2), and with apron (2) sealing connection.
2. The pole assembly of claim 1, wherein the connector (12) has a first surface and a second surface opposite the first surface; the plane of the first surface at the weakened portion (122) is lower than the plane of the first surface at the main body portion (121), and/or the plane of the second surface at the weakened portion (122) is lower than the plane of the second surface at the main body portion (121).
3. The pole post assembly of claim 2, wherein the body portion (121) comprises a first body portion (1211) and a second body portion (1212), the first body portion (1211) being arranged around the pole post body (11), the second body portion (1212) being arranged around the first body portion (1211), and the weakened portion (122) being arranged between the first body portion (1211) and the second body portion (1212), the first body portion (1211), the second body portion (1212) being integrally formed with the weakened portion (122), the first body portion (1211) being for fixedly connecting the pole post body (11), and the second body portion (1212) being for fixedly connecting the cover plate (2).
4. The pole assembly as claimed in claim 3, characterized in that either one of the first body portion (1211) and the pole body (11) is provided with a first convex portion (51), the other one of the first body portion (1211) and the pole body (11) is provided with a first concave portion (52), the first convex portion (51) is in a concavo-convex fit with the first concave portion (52); and/or any one of the second split part (1212) and the cover plate (2) is provided with a second convex part (53), the other one of the second split part (1212) and the cover plate (2) is provided with a second concave part (54), and the second concave part (54) is in concave-convex fit with the second convex part (53).
5. A pole assembly as claimed in claim 3, wherein the weakened portion (122) is arranged around the centre of the pole body (11) outside the first body portion (1211) and inside the second body portion (1212), wherein the weakened portion (122) is an annular groove.
6. Pole assembly according to claim 1, characterized in that the connector (12) further comprises a reinforcement part (123), the reinforcement part (123) being provided to the body part (121) and/or the weakened part (122), the reinforcement part (123) being used to reinforce the structural strength of the pole assembly (1).
7. A battery top cover, characterized in that, comprises a cover plate (2) and the pole assembly (1) of any one of claims 1 to 6, two of the pole assemblies (1) are arranged on the cover plate (2) at intervals.
8. The battery top cover according to claim 7, characterized in that the cover plate (2) is further provided with a liquid injection port (22), and the liquid injection port (22) is positioned between the two pole assemblies (1).
9. A power battery, characterized by comprising a battery core (4), a casing (3) and the battery top cover of claim 8, wherein the battery core (4) is accommodated in the casing (3), and the cover plate (2) in the battery top cover is connected with the casing (3) in a sealing manner.
10. The power battery according to claim 9, wherein the cover plate (2) is provided with a pole through hole (21), and the ratio of the area of the pole through hole (21) to the capacity of the power battery ranges from 200 to 2500mm 2 :100Ah。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221122655.2U CN218182409U (en) | 2022-05-11 | 2022-05-11 | But utmost point post subassembly, battery top cap and power battery of pressure release |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221122655.2U CN218182409U (en) | 2022-05-11 | 2022-05-11 | But utmost point post subassembly, battery top cap and power battery of pressure release |
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| Publication Number | Publication Date |
|---|---|
| CN218182409U true CN218182409U (en) | 2022-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221122655.2U Active CN218182409U (en) | 2022-05-11 | 2022-05-11 | But utmost point post subassembly, battery top cap and power battery of pressure release |
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| CN (1) | CN218182409U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117374488A (en) * | 2023-12-07 | 2024-01-09 | 蜂巢能源科技股份有限公司 | Cover plate and battery |
| CN117855710A (en) * | 2024-03-07 | 2024-04-09 | 蜂巢能源科技股份有限公司 | Cover plate assembly, battery and battery pack |
-
2022
- 2022-05-11 CN CN202221122655.2U patent/CN218182409U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117374488A (en) * | 2023-12-07 | 2024-01-09 | 蜂巢能源科技股份有限公司 | Cover plate and battery |
| CN117374488B (en) * | 2023-12-07 | 2024-02-20 | 蜂巢能源科技股份有限公司 | Cover plate and battery |
| CN117855710A (en) * | 2024-03-07 | 2024-04-09 | 蜂巢能源科技股份有限公司 | Cover plate assembly, battery and battery pack |
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