CN216213971U - End cover assembly, power battery and electric device - Google Patents
End cover assembly, power battery and electric device Download PDFInfo
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- CN216213971U CN216213971U CN202122508451.4U CN202122508451U CN216213971U CN 216213971 U CN216213971 U CN 216213971U CN 202122508451 U CN202122508451 U CN 202122508451U CN 216213971 U CN216213971 U CN 216213971U
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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 relates to an end cover assembly, a power battery and an electric device, wherein the end cover assembly comprises: an end cover plate; the conducting piece is positioned on one side of the end cover plate and is provided with a conducting area, a first insulating area and a second insulating area, and the conducting area is provided with a preset resistor; a first current collecting member for connecting the electrode assembly; a second current collecting member for connecting the electrode assembly; under the low temperature state, the first current collecting component is contacted with the first insulation area, the second current collecting component is contacted with the second insulation area, under the high temperature state, the conducting piece is expanded and deformed, so that the first current collecting component and the second current collecting component are converted into contact with the conductive area, the electrode assembly, the first current collecting component, the conducting piece and the second current collecting component form an electrifying loop, the current on the electrode assembly flows through the conducting piece, the current of the electrode assembly can be reduced, the electrode assembly discharges with smaller current, the temperature in the power battery is favorably reduced, and the power battery is prevented from being exploded.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to an end cover assembly, a power battery and an electric device.
Background
Electric vehicles, energy storage power stations, and the like generally require the use of power batteries having a large capacity as power sources. In addition to high capacity, these power batteries should have good safety and long cycle life, so as to meet the use standards and meet the needs of people.
Generally, when a battery is subjected to improper use, such as overcharge, short circuit or exposure to a high-temperature environment, the battery is liable to generate a large amount of gas and heat due to internal reaction, and even internal short circuit occurs to cause thermal runaway. In order to reduce the internal air pressure of the battery, an explosion-proof valve is usually installed on the end cover of the battery, and the explosion-proof valve is opened to release the pressure when the internal air pressure of the battery reaches a certain value, so as to eliminate the safety hazard caused by high air pressure. However, after the battery is decompressed, the inside of the battery still has high energy, and if the external high-temperature environment cannot be changed, the high-energy substances inside the battery still can react violently and burn and explode, which causes unpredictable damage.
SUMMERY OF THE UTILITY MODEL
Accordingly, there is a need to provide an end cap assembly, a power battery and an electric device, which can effectively reduce the temperature inside the power battery and prevent the power battery from exploding
An end cap assembly comprising:
an end cover plate;
the conducting piece is positioned on one side of the end cover plate and is provided with a conducting area, a first insulating area and a second insulating area, and the conducting area is provided with a preset resistor;
a first current collecting member for connecting the electrode assembly;
a second current collecting member for connecting the electrode assembly;
under the low temperature state, the first current collecting component is contacted with the first insulation area, the second current collecting component is contacted with the second insulation area, and under the high temperature state, the conducting piece is expanded and deformed, so that the first current collecting component and the second current collecting component are both converted into contact with the conductive area.
According to the end cover assembly, under a high-temperature state, the conducting piece expands and deforms, the first current collecting component is converted from being in contact with the first insulation area to being in contact with the conducting area, the second current collecting component is converted from being in contact with the second insulation area to being in contact with the conducting area, so that the electrode assembly, the first current collecting component, the conducting piece and the second current collecting component form a power-on loop, current on the electrode assembly flows through the conducting piece, and the conducting area of the conducting piece has preset resistance, so that the current of the electrode assembly can be reduced, the electrode assembly discharges with small current, the SOC of the electrode assembly is reduced, the temperature inside a power battery is reduced, and the power battery is prevented from exploding.
In one embodiment, the first current collecting member has a first protrusion, and the second current collecting member has a second protrusion, the first protrusion being in contact with the first insulating region and the second protrusion being in contact with the second insulating region in a low temperature state; in a high temperature state, the first bump is in contact with the conductive region, and the second bump is in contact with the conductive region. By providing the first and second protrusions, the first current collecting member can be accurately brought into contact with the conductive region or the first insulating region, and the second current collecting member can be accurately brought into contact with the conductive region or the second insulating region.
In one embodiment, the connector further comprises an insulating member located on one side of the conducting member, which is away from the end cover plate, the first current collecting member and the second current collecting member are both located on one side of the insulating member, which is away from the conducting member, and the insulating member is provided with a first abdicating hole for the first protrusion to penetrate through and a second abdicating hole for the second protrusion to penetrate through.
In one embodiment, the insulation member is provided with a limit groove, the conduction member is movably accommodated in the limit groove, and the first and second abdicating holes are both arranged at the bottom of the limit groove. Carry on spacingly through the spacing groove to the piece that switches on, prevent to switch on the great skew of piece, can allow again to switch on the piece and can take place the inflation deformation relative to the spacing groove under high temperature state.
In one embodiment, the terminal cover further comprises a first pole column arranged on the terminal cover plate and a second pole column arranged on the terminal cover plate, wherein the first pole column is connected with the first current collecting member, and the second pole column is connected with the second current collecting member.
In one embodiment, the first current collecting member has a first convex pillar abutting against the first pole, and the second current collecting member has a second convex pillar abutting against the second pole. Through setting up first projection and second projection, make first mass flow component can be stably connected with first utmost point post, make second mass flow component can be stably connected with second utmost point post.
In one embodiment, the explosion-proof device further comprises an explosion-proof valve arranged on the end cover plate, the conducting piece is connected with the explosion-proof valve, and when the explosion-proof valve is opened, the conducting piece is driven to move, so that the conducting area is in contact with the end cover plate, the first current collecting member and the second current collecting member, or the first current collecting member and the second current collecting member are connected with the end cover plate. The safety performance of the electrode assembly is effectively enhanced.
In one embodiment, the first current collecting member and/or the second current collecting member has a fusing portion configured to be easily fused by heat. When the voltage of the electrode assembly is higher during overcharge, the temperatures of the first current collecting component and the second current collecting component are increased, and when the temperature exceeds the preset temperature, the fusing part is fused, so that the electrifying loop is disconnected, and the safety performance of the electrode assembly is effectively enhanced.
A power battery comprises an electrode assembly and the end cover assembly.
An electric device comprises the power battery.
Drawings
Fig. 1 is a front view of a power cell according to an embodiment of the present invention;
FIG. 2 is an axial cross-sectional view A-A of the power cell shown in FIG. 1;
FIG. 3 is an exploded view of the power cell shown in FIG. 1;
FIG. 4 is a partially exploded view of the end cap assembly shown in FIG. 3;
fig. 5 is a schematic structural diagram of a conducting piece of a power battery according to another embodiment of the utility model;
fig. 6 is a schematic structural view of the first current collecting member and the second current collecting member shown in fig. 3;
fig. 7 is an enlarged schematic diagram of the power battery shown in fig. 2 at the position B.
The meaning of the reference symbols in the drawings is:
the terminal cover plate 31, the first pole hole 310, the second pole hole 311, the mounting hole 312, the conducting element 32, the conducting area 320, the first insulating area 321, the second insulating area 322, the connecting area 323, the first current collecting member 33, the first protrusion 330, the first protrusion 331, the second current collecting member 34, the second protrusion 340, the second protrusion 341, the bent portion 342, the end cover patch 35, the insulating element 36, the first abdicating hole 360, the second abdicating hole 361, the limiting groove 362, the first through hole 363, the second through hole 364, the first pole 37, the first sealing ring 370, the second pole 38, the second sealing ring 380, the explosion-proof valve 39, the protection plate 391, the insulating sleeves 40, 50 and the blue membrane 60.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "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 are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.
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 expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. 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.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1 and fig. 2, fig. 1 is a front view of a power battery according to an embodiment of the utility model, and fig. 2 is an axial sectional view of the power battery shown in fig. 1. The power battery comprises a casing 10, an electrode assembly 20 and an end cap assembly 30, wherein the casing 10 is a metal shell, specifically, the casing 10 is an aluminum shell, the electrode assembly 20 is accommodated in the casing 10, and the end cap assembly 30 is located outside the casing 10 and is connected with the electrode assembly 20.
Referring to fig. 3 and 4, fig. 3 is an exploded view of the power cell shown in fig. 1, and fig. 4 is a partially exploded view of the end cap assembly shown in fig. 3. The end cap assembly 30 includes an end cap plate 31, a conductive element 32, a first current collecting member 33 and a second current collecting member 34, wherein the conductive element 32 is disposed on one side of the end cap plate 31 and has a conductive region 320, a first insulating region 321 and a second insulating region 322, and the conductive region 320 has a predetermined resistance. The first current collecting member 33 and the second current collecting member 34 are used to connect the electrode assembly 20; in the low temperature state, the first current collecting member 33 is in contact with the first insulating region 321, and the second current collecting member 34 is in contact with the second insulating region 322, and in the high temperature state, the temperature of the high temperature state is much higher than that of the low temperature state, and the conductive member 32 is expanded and deformed, so that both the first current collecting member 33 and the second current collecting member 34 are in contact with the conductive region 320.
It is understood that, in a low temperature state, i.e., in a normal state, the first current collecting member 33 is in contact with the first insulation region 321 and the second current collecting member 34 is in contact with the second insulation region 322, and at this time, the electrode assembly 20, the first current collecting member 33, the lead 32, and the second current collecting member 34 do not form a current-carrying loop, so that current on the electrode assembly 20 does not flow through the lead 32. In a high temperature State, the conductive member 32 is expanded by heat, the conductive region 320 presses the first insulating region 321 and the second insulating region 322 to be displaced, so that the first insulating region 321 is displaced from the first current collecting member 33, the second insulating region 322 is displaced from the second current collecting member 34, and the conductive region 320 corresponds to the first current collecting member 33 and the second current collecting member 34, so that the first current collecting member 33 and the second current collecting member 34 are both in contact with the conductive region 320, and at this time, the electrode assembly 20, the first current collecting member 33, the conductive member 32, and the second current collecting member 34 form a current conducting loop, and a current on the electrode assembly 20 flows through the conductive member 32, and since the conductive region 320 of the conductive member 32 has a predetermined resistance, the current on the electrode assembly 20 can be reduced, the electrode assembly 20 is discharged with a small current, and the SOC (State of Charge, abbreviated as SOC), where SOC is the state of charge of electrode assembly 20, referring to the available state of charge remaining in electrode assembly 20.
In the high temperature state, the electrode assembly 20 is discharged with a small current by forming an energizing circuit through the electrode assembly 20, the first current collecting member 33, the conducting member 32, and the second current collecting member 34: when the capacity of the electrode assembly 20 is 150Ah, the voltage of the electrode assembly 20 is 4.2V, and the internal resistance of the electrode assembly 20 is 0.5m Ω, and the electrode assembly 20, the first current collecting member 33, the conductive member 32, and the second current collecting member 34 do not form a current-carrying loop, the current when the electrode assembly 20 is discharged is 84000A, which is obtained from the formula of I ═ V/R. The lead-through 32 is made of high manganese alloy (Mn72Cr18Ni10), wherein the content of Mn is 66%, and the thermal expansion coefficient of the lead-through 32 is 30 x 10-6When the length of the conductive region 320 is 150mm, the width of the conductive region 320 is 20mm, and the resistance of the conductive region 320 is 0.080 Ω, and thus the electrode assembly 20, the first current collecting member 33, the conductive member 32, and the second current collecting member 34 form a current-carrying loop, the resistance in the current-carrying loop is the sum of the resistance of the electrode assembly 20 and the resistance of the conductive region 320, i.e., R is 0.0005+0.08 is 0.0805 Ω, and I is V/R formula, the electrode assembly 20, the first current collecting member 33, the conductive member 32, and the second current collecting member 34 form a current-carrying loopThe current in the energizing circuit is about 50A, i.e., the current at which electrode assembly 20 discharges is about 50A, much less than 84000A, and electrode assembly 20 can discharge to 0% SOC at a rate of 0.33C with a small current.
Referring to fig. 3, it should be noted that the electrode assembly 20 has a positive tab 21 and a negative tab 22, and the first current collecting member 33 is connected to the positive tab 21, i.e., the first current collecting member 33 is electrically connected to the electrode assembly 20 through the positive tab 21. The second current collecting member 34 is connected to the negative electrode tab 22, i.e., the second current collecting member 34 is electrically connected to the electrode assembly 20 through the negative electrode tab 22. Thus, when the first and second current collecting members 33 and 34 are connected to the conductive region 320, the electrode assembly 20, the positive electrode tab 21, the first current collecting member 33, the lead 32, the second current collecting member 34, and the negative electrode tab 22 form a current-carrying loop.
In some embodiments, the power cell further includes an insulating sheath 40 wrapped around the electrode assembly 20, a backing plate 50 disposed on a side of the electrode assembly 20 remote from the end cap assembly 30, and a blue membrane 60 wrapped around the housing 10.
The end cover plate 31 is a metal plate and has high conductivity. Specifically, the end cover plate 31 is an aluminum plate.
In some embodiments, the end cap assembly 30 further includes an end cap patch 35, the end cap patch 35 is attached to a side of the end cap plate 31 facing away from the conducting member 32, and the end cap patch 35 is used to protect the end cap plate 31 from abrasion.
In some embodiments, the end cap assembly 30 further includes a first pole post 37 disposed on the end cap plate 31 and a second pole post 38 disposed on the end cap plate 31. Specifically, as shown in fig. 4, the end cover plate 31 is provided with a first pole post hole 310 and a second pole post hole 311, the first pole post 37 is inserted into the first pole post hole 310, and the second pole post 38 is inserted into the second pole post hole 311. Further, the first pole post 37 is sleeved with a first sealing ring 370, the first sealing ring 370 is in sealing fit with the inner wall of the first pole post hole 310, the second pole post 38 is sleeved with a second sealing ring 380, and the second sealing ring 380 is in sealing fit with the inner wall of the second pole post hole 311. The first pole 37 is connected to the first current collecting member 33, and the second pole 38 is connected to the second current collecting member 34.
In some embodiments, the end cap assembly 30 further includes an explosion-proof valve 39 disposed on the end cap plate 31, the explosion-proof valve 39 being located between the first pole post 37 and the second pole post 38. Specifically, the end cover plate 31 is provided with a mounting hole 312, the mounting hole 312 is located between the first pole hole 310 and the second pole hole 311, and the explosion-proof valve 39 is embedded in the mounting hole 312. When the internal gas pressure of the power battery is excessively increased due to the overcharge, overdischarge, or overheating of the electrode assembly 20 to generate gas, the explosion-proof valve 39 is automatically opened so that the internal gas of the power battery can be discharged to the outside through the position of the explosion-proof valve 39, thereby preventing the internal gas pressure of the power battery from being excessively increased to explode.
Further, a protective sheet 391 is arranged on a side of the explosion-proof valve 39 facing away from the conducting piece 32, and the protective sheet 391 is used for protecting the explosion-proof valve 39 from external wear.
In some embodiments, the conducting member 32 is disposed corresponding to the explosion-proof valve 39, that is, the limiting groove 362 is disposed corresponding to the mounting hole 312, and the conducting member 32 is connected to the explosion-proof valve 39. Specifically, the conducting member 32 has a connecting region 323 thereon, the connecting region 323 is located between the first insulating region 321 and the second insulating region 322, and the connecting region 323 is fixedly connected to the explosion-proof valve 39. When the explosion-proof valve 39 is opened, the conducting piece 32 is driven to move, so that the conducting area 320 is in contact with the end cover plate 31, the first current collecting member 33 and the second current collecting member 34, or the first current collecting member 33 and the second current collecting member 34 are in direct contact with the end cover plate 31, so that the electrode assembly 20, the first current collecting member 33, the conducting piece 32, the end cover plate 31 and the second current collecting member 34 form a conducting loop, that is, the electrode assembly 20, the positive tab 21, the first current collecting member 33, the end cover plate 31, the second current collecting member 34 and the negative tab 22 form a conducting loop, at this time, the external voltage detecting meter detects the voltage jump of the electrode assembly 20, and can play a role of warning, if the voltage of the electrode assembly 20 is high, the first current collecting member 33 and/or the second current collecting member 34 can be fused, if the end cover plate 31 plays a role of protecting the electrode assembly 20, the safety performance of the electrode assembly 20 is effectively enhanced.
In some embodiments, the end cap assembly 30 further includes an insulating member 36 positioned at a side of the conductive member 32 facing away from the end cap plate 31, i.e., the conductive member 32 is positioned between the end cap plate 31 and the insulating member 36, the insulating member 36 is disposed on the electrode assembly 20, and the first collecting member 33 and the second collecting member 34 are both positioned at a side of the insulating member 36 facing away from the conductive member 32. In the present embodiment, the insulating member 36 is plastic. The insulation member 36 is provided with a limit groove 362, the limit groove 362 is arranged on one side of the insulation member 36 facing the end cover plate 31, the conducting member 32 is movably accommodated in the limit groove 362, the conducting member 32 is limited by the limit groove 362, so that the conducting member 32 is prevented from being greatly deviated, and the conducting member 32 is allowed to expand and deform relative to the limit groove 362 in a high-temperature state. The insulating member 36 is provided with a first yielding hole 360 and a second yielding hole 361, the first yielding hole 360 and the second yielding hole 361 are both disposed at the bottom of the limiting groove 362, and the first yielding hole 360 and the second yielding hole 361 are respectively disposed at two ends of the limiting groove 362. The insulating member 36 is further provided with a first through hole 363 and a second through hole 364, the first through hole 363 and the second through hole 364 are respectively located outside two ends of the limiting slot 362, and the first through hole 363 and the second through hole 364 are respectively correspondingly communicated with the first pole hole 310 and the second pole hole 311.
In the embodiment shown in fig. 4, the first insulating region 321 is spaced apart from the second insulating region 322, the conductive region 320 is located between the first insulating region 321 and the second insulating region 322, and the connecting region 323 is located in the middle of the conductive member 32. In the embodiment shown in fig. 5, the first insulating region 321 is disposed opposite to the second insulating region 322 with a gap therebetween, the conductive region 320 is disposed around the first insulating region 321 and the second insulating region 322, and the connecting region 323 is located in the middle of the conductive element 32.
Referring to fig. 6 and 7, fig. 6 is a schematic structural view of the first current collecting member and the second current collecting member shown in fig. 3, and fig. 7 is an enlarged schematic view of a portion B of the power battery shown in fig. 2. The first collecting member 33 has a first protrusion 330 thereon, the first protrusion 330 being located at one end of the first collecting member 33, the second collecting member 34 having a second protrusion 340, the second protrusion 340 being located at one end of the second collecting member 34. In a low temperature state, the first protrusion 330 contacts the first insulating region 321, and the second protrusion 340 contacts the second insulating region 322. Specifically, the first protrusion 330 contacts the first insulating region 321 through the first relief hole 360, and the second protrusion 340 contacts the second insulating region 322 through the second relief hole 361. In a high temperature state, the first bump 330 contacts the conductive region 320, and the second bump 340 contacts the conductive region 320. Specifically, the first bump 330 contacts the conductive region 320 through the first yielding hole 360, and the second bump 340 contacts the conductive region 320 through the second yielding hole 361. By providing the first and second protrusions 330 and 340, the first current collecting member 33 can be accurately brought into contact with the conductive region 320 or the first insulating region 321, and the second current collecting member 34 can be accurately brought into contact with the conductive region 320 or the second insulating region 322.
Further, the first current collecting member 33 has a first convex pillar 331, the first convex pillar 331 is located at one end of the first current collecting member 33 far away from the first protrusion 330, and the first convex pillar 331 is correspondingly abutted to the first pole 37. That is, the first current collecting member 33 is electrically connected to the first pole 37 through the second protrusion 340. Specifically, the first protruding column 331 passes through the first through hole 363 and correspondingly abuts against the first pole 37. The second current collecting member 34 has a second protrusion 341, the second protrusion 341 is located at one end of the second current collecting member 34 far from the second protrusion 340, and the second protrusion 341 abuts against the second pole 38, that is, the second current collecting member 34 is electrically connected with the second pole 38 through the second protrusion 340. Specifically, the second pillar 341 abuts the second pillar 38 through the second through hole 364. By providing the first convex column 331 and the second convex column 341, the first current collecting member 33 can be stably connected to the first pole 37, and the second current collecting member 34 can be stably connected to the second pole 38.
The first current collecting member 33 has a fusing portion, or the second current collecting member 34 has a fusing portion, or both the first current collecting member 33 and the second current collecting member 34 have a fusing portion, and the fusing portion is configured to be easily fused by heat. It can be understood that, at the time of overcharge, since the voltage of the electrode assembly 20 is high, the first current collecting member 33 and the second current collecting member 34 are increased in temperature, and when the temperature exceeds a preset temperature, the fusing part is fused, so that the energizing circuit is disconnected, effectively enhancing the safety performance of the electrode assembly 20. In the present embodiment, the first current collecting member 33 is not provided with the fusing part, and the second current collecting member 34 has the fusing part, specifically, the fusing part of the second current collecting member 34 is a bent part 342, as shown in fig. 6, so that when the electrode assembly 20 is overcharged, the bent part 342 is easily fused.
In the power battery of the utility model, under a high temperature state, the conducting piece 32 is expanded and deformed, the first current collecting member 33 is changed from being in contact with the first insulating region 321 to being in contact with the conducting region 320, the second current collecting member 34 is changed from being in contact with the second insulating region 322 to being in contact with the conducting region 320, so that the electrode assembly 20, the first current collecting member 33, the conducting piece 32 and the second current collecting member 34 form an electrifying loop, the current on the electrode assembly 20 flows through the conducting piece 32, and the conducting region 320 of the conducting piece 32 has a preset resistance, so that the current of the electrode assembly 20 can be reduced, the electrode assembly 20 is discharged with a smaller current, the SOC of the electrode assembly 20 is reduced, the temperature inside the power battery is favorably reduced, and the explosion of the power battery is prevented.
The utility model also provides an electric device which comprises the power battery. The power battery pack provides power for the electric device or serves as an energy storage energy unit of the electric device. The electric device may be any electric device suitable for various batteries, such as a battery car, an electric toy, an electric tool, an electric vehicle, a ship, a spacecraft, and the like, for example, a spacecraft including an airplane, a rocket, a space shuttle, a spacecraft, and the like.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An end cap assembly (30), comprising:
an end cover plate (31);
the conducting piece (32) is positioned on one side of the end cover plate (31) and is provided with a conducting area (320), a first insulating area (321) and a second insulating area (322), and the conducting area (320) is provided with a preset resistance;
a first current collecting member (33) for connecting the electrode assembly (20);
a second current collecting member (34) for connecting the electrode assembly (20);
in a low temperature state, the first current collecting member (33) is in contact with the first insulation region (321), the second current collecting member (34) is in contact with the second insulation region (322), and in a high temperature state, the conducting piece (32) is expanded and deformed, so that the first current collecting member (33) and the second current collecting member (34) are both in contact with the conductive region (320).
2. The end cap assembly (30) of claim 1, wherein the first current collecting member (33) has a first protrusion (330), the second current collecting member (34) has a second protrusion (340), and the first protrusion (330) is in contact with the first insulating region (321) and the second protrusion (340) is in contact with the second insulating region (322) in a low temperature state; in a high temperature state, the first bump (330) is in contact with the conductive region (320), and the second bump (340) is in contact with the conductive region (320).
3. The end cover assembly (30) of claim 2, further comprising an insulating member (36) located on a side of the conducting member (32) facing away from the end cover plate (31), wherein the first current collecting member (33) and the second current collecting member (34) are both located on a side of the insulating member (36) facing away from the conducting member (32), and the insulating member (36) is provided with a first recess hole (360) for the first protrusion (330) to pass through and a second recess hole (361) for the second protrusion (340) to pass through.
4. The end cap assembly (30) of claim 3, wherein the insulating member (36) is provided with a limiting groove (362), the conducting member (32) is movably received in the limiting groove (362), and the first and second yielding holes (360, 361) are both disposed at the bottom of the limiting groove (362).
5. The end cap assembly (30) of claim 1, further comprising a first pole post (37) disposed on the end cap plate (31) and a second pole post (38) disposed on the end cap plate (31), the first pole post (37) being connected with the first current collecting member (33) and the second pole post (38) being connected with the second current collecting member (34).
6. The end cap assembly (30) of claim 5, wherein the first current collecting member (33) has a first post (331), the first post (331) abutting the first pole (37), and the second current collecting member (34) has a second post (341), the second post (341) abutting the second pole (38).
7. The end cap assembly (30) of claim 1, further comprising an explosion-proof valve (39) disposed on the end cap plate (31), wherein the conducting member (32) is connected to the explosion-proof valve (39), and wherein when the explosion-proof valve (39) is opened, the conducting member (32) is moved to contact the conductive region (320) with the end cap plate (31), the first current collecting member (33) and the second current collecting member (34), or both the first current collecting member (33) and the second current collecting member (34) are connected to the end cap plate (31).
8. The end cap assembly (30) of claim 7, wherein the first current collecting member (33) and/or the second current collecting member (34) has a fuse portion configured to be easily fused by heat.
9. A power cell comprising an electrode assembly (20) and an end cap assembly (30) according to any one of claims 1 to 8.
10. An electric device comprising the power cell of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122508451.4U CN216213971U (en) | 2021-10-18 | 2021-10-18 | End cover assembly, power battery and electric device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122508451.4U CN216213971U (en) | 2021-10-18 | 2021-10-18 | End cover assembly, power battery and electric device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115000641A (en) * | 2022-08-04 | 2022-09-02 | 江苏时代新能源科技有限公司 | End cover assembly, battery monomer, battery and power consumption device |
| WO2024103201A1 (en) * | 2022-11-14 | 2024-05-23 | 宁德时代新能源科技股份有限公司 | End cover assembly, battery cell, battery, and electrical apparatus |
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2021
- 2021-10-18 CN CN202122508451.4U patent/CN216213971U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115000641A (en) * | 2022-08-04 | 2022-09-02 | 江苏时代新能源科技有限公司 | End cover assembly, battery monomer, battery and power consumption device |
| CN115000641B (en) * | 2022-08-04 | 2022-11-29 | 江苏时代新能源科技有限公司 | End cover assembly, battery monomer, battery and power consumption device |
| WO2024103201A1 (en) * | 2022-11-14 | 2024-05-23 | 宁德时代新能源科技股份有限公司 | End cover assembly, battery cell, battery, and electrical apparatus |
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