CN220209106U - End cap assembly, battery and energy storage device - Google Patents

Abstract

The utility model discloses an end cover assembly, a battery and an energy storage device, wherein the end cover assembly comprises: the pole, the cover plate and the heat dissipation piece. The cover plate is provided with an outer side face and an inner side face which are opposite to each other along the thickness direction of the cover plate, the pole is arranged on the cover plate in a penetrating mode, the radiating piece is located between the pole and the cover plate, at least one side surface of the radiating piece is in contact heat exchange with the pole, and at least the other side surface of the radiating piece is in contact heat exchange with the cover plate. The end cover assembly can improve the heat dissipation efficiency of the pole.

Description

End cap assembly, battery and energy storage device

Technical Field

The utility model relates to the technical field of batteries, in particular to an end cover assembly, a battery and an energy storage device.

Background

When the battery is used for a long time, overcharged or in a high temperature environment, the battery core in the battery can generate heat accumulation, and as the heat of the battery core is accumulated continuously in the battery, the internal structure (such as an insulating structure) of the battery is easily damaged, so that a short circuit occurs in the battery, the thermal runaway of the battery is further caused, a large amount of heat and combustible gas are generated, and the risk of combustion explosion exists.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present utility model is to provide an end cap assembly capable of improving heat dissipation efficiency to a pole.

The utility model also provides a battery with the end cover assembly.

The utility model also provides an energy storage device with the battery.

An end cap assembly according to an embodiment of the present utility model includes: the cover plate is provided with an outer side surface and an inner side surface which are opposite in the thickness direction of the cover plate; the pole is arranged on the cover plate in a penetrating way; the heat dissipation piece is located between the pole and the cover plate, at least one side surface of the heat dissipation piece is in contact heat exchange with the pole, and at least the other side surface of the heat dissipation piece is in contact heat exchange with the cover plate.

According to the end cover assembly provided by the embodiment of the utility model, the heat of the pole can be directly emitted to the outside of the battery, and meanwhile, the heat of the pole can be conducted to the cover plate through the heat-radiating piece, so that the cover plate can participate in the heat radiation of the pole, the heat-emitting path of the pole is increased, the heat radiation efficiency of the pole can be improved, the heat radiation path of the battery core through the pole is also increased, and the overall heat radiation efficiency of the battery can be improved.

In some embodiments, the end cap assembly further comprises: the lower plastic is attached to the inner side face of the cover plate and used for fixing the heat dissipation piece, and the heat dissipation piece is arranged on the inner side face of the cover plate and at least in contact with the inner side face of the cover plate for heat exchange. Therefore, the heat dissipation part is arranged on the inner side surface of the cover plate through the lower plastic, after the heat of the pole is transferred to the heat dissipation part, the heat of the heat dissipation part can be transferred to the cover plate from the inner side surface of the cover plate, and the thickness of the cover plate is smaller, namely, the conduction path of the heat in the cover plate is shorter, so that the cover plate can have higher heat dissipation efficiency.

In some embodiments, the end cap assembly further comprises: and the upper plastic is arranged on the outer side surface of the cover plate and is provided with a pole through hole, the pole penetrates through the pole through hole, and the heat dissipation part is positioned outside the orthographic projection range of the cover plate. From this, the utmost point post is fixed in the utmost point post via hole, and goes up the plastic and fix at the apron to realize the fixed setting of utmost point post on the apron, can improve simultaneously heat conduction and radiating efficiency to the utmost point post.

Further, the end cap assembly further comprises: the sealing piece is sleeved on the pole and is positioned between the pole and the heat dissipation piece. Therefore, the sealing element can improve the sealing performance and the insulativity between the cover plate and the pole, and meanwhile, the heat dissipation efficiency of the heat dissipation element to the pole can be improved.

Further, the heat dissipation piece and the sealing piece are arranged at intervals, so that an avoidance space for avoiding deformation of the sealing piece is formed. From this, can reduce or avoid the setting position of radiating member to produce the skew under the extrusion of sealing member, make radiating member and post and apron can keep stable contact, guarantee that radiating member can play stable heat conduction effect between post and apron.

Specifically, the cover plate is provided with a flange part extending towards the pole, a limit part is arranged on one side of the flange part towards the upper plastic, the limit part is in limit fit with the upper plastic, and the flange part is suitable for pressing against the sealing element. Therefore, the arrangement position of the upper plastic on the cover plate can be defined, namely, the position of the pole penetrating through the cover plate can also be defined. Meanwhile, the flange part presses against the sealing element to limit the arrangement position of the sealing element relative to the cover plate, so that the arrangement positions of the pole and the sealing element relative to the cover plate can be limited, and the sealing and insulation stability between the pole and the cover plate are ensured.

In some embodiments, the heat sink is annular, the heat sink comprising: the axial direction of the pole is provided with a first ring body and a second ring body in sequence, the outer diameter of the first ring body is smaller than that of the second ring body so as to limit a step surface, the lower plastic is provided with a limit flange extending towards the pole, the limit flange is arranged on the step surface, the first ring body is in contact with the cover plate, and the second ring body is in contact with the pole. Therefore, the limiting flange is arranged on the step surface, so that the setting position of the heat dissipation part relative to the lower plastic can be limited, and the connection stability between the heat dissipation part and the lower plastic is improved. The contact surface between the second ring body and the pole is larger, and the heat conduction area between the heat dissipation part and the pole can be increased, so that the heat conduction efficiency between the heat dissipation part and the pole is improved, namely, the heat dissipation effect of the heat dissipation part on the pole is improved.

In some embodiments, the lower plastic is provided with heat exchange holes. Therefore, heat in the battery such as the battery core can be directly conducted to the cover plate through the heat exchange holes, so that the heat in the battery can be dissipated to the outside of the battery through the cover plate, and the heat dissipation effect in the battery is improved. In addition, through set up the heat exchange hole on lower plastic, can reduce the volume of lower plastic, reduce the material cost of lower plastic promptly.

A battery according to an embodiment of the present utility model includes: a housing having an opening; a battery cell housed within the housing; the end cover assembly is the end cover assembly according to the above embodiment, and the end cover assembly covers the opening.

According to the battery provided by the embodiment of the utility model, the end cover assembly is adopted, so that the heat of the pole can be directly radiated out of the battery, and meanwhile, the heat of the pole can be conducted to the cover plate through the heat radiating piece, so that the cover plate can participate in the heat radiation of the pole, the heat radiation path of the pole is increased, the heat radiation efficiency of the pole can be improved, the heat radiation path of the battery core through the pole is also increased, the overall heat radiation efficiency of the battery can be improved, and the thermal runaway risk of the battery is reduced.

According to an embodiment of the present utility model, an energy storage device includes: the battery described in the above embodiment.

According to the energy storage device disclosed by the embodiment of the utility model, the heat of the pole can be directly emitted to the outside of the battery by adopting the battery of the embodiment, and meanwhile, the heat of the pole can be conducted to the cover plate through the heat-radiating piece by arranging the heat-radiating piece, so that the cover plate can participate in the heat radiation of the pole, the heat-emitting path of the pole is increased, the heat radiation efficiency of the pole can be improved, the heat radiation path of the battery core through the pole is also increased, the overall heat radiation efficiency of the battery can be improved, the overall heat radiation efficiency of the energy storage device is further improved, and the thermal runaway risk of the energy storage device is reduced.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is an exploded view of an end cap assembly according to a first embodiment of the present utility model;

FIG. 2 is a cross-sectional block diagram of the end cap assembly of the embodiment of FIG. 1;

FIG. 3 is an enlarged schematic view of the structure shown at A in FIG. 2;

FIG. 4 is an exploded view of an end cap assembly according to a second embodiment of the present utility model;

FIG. 5 is a schematic illustration of the heat sink of the end cap assembly of the embodiment of FIG. 4;

FIG. 6 is a cross-sectional structural view of the end cap assembly of the embodiment of FIG. 4;

FIG. 7 is an enlarged schematic view of the structure shown at B in FIG. 6;

FIG. 8 is a schematic view of a lower plastic according to an embodiment of the utility model;

FIG. 9 is a schematic view of a lower plastic according to another embodiment of the present utility model;

fig. 10 is an exploded structural view of a battery according to an embodiment of the present utility model;

fig. 11 is an exploded structural view of an energy storage device according to an embodiment of the present utility model.

Reference numerals:

battery 1000,

End cap assembly 100,

An outer side surface S1, an inner side surface S2, a step surface S3, an avoidance space V1,

Cover plate 11, flange 111, limit 112,

A pole 12,

A heat sink 13, a first ring 131, a second ring 132,

Lower plastic 14, limit flange 141, heat exchange hole 142,

Upper plastic 15, post via 151,

A sealing member 16,

Cell 200, housing 300,

Battery box 1100, energy storage device 2000.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "thickness," "upper," "lower," "axial," "radial," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model.

In the description of the utility model, a "first feature" or "second feature" may include one or more of such features. In the description of the present utility model, "plurality" means two or more. In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween. In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

An end cap assembly 100, a battery, and an energy storage device according to an embodiment of the present utility model are described below with reference to the accompanying drawings.

As shown in fig. 1-3, an end cap assembly 100 according to an embodiment of the present utility model includes: a pole 12, a cover plate 11 and a heat sink 13.

The cover plate 11 has an outer side surface S1 and an inner side surface S2 opposite to each other along the thickness direction thereof, the pole 12 is penetrated through the cover plate 11, the heat sink 13 is located between the pole 12 and the cover plate 11, at least one side surface of the heat sink 13 is in contact with the pole 12 for heat exchange, and at least the other side surface is in contact with the cover plate 11 for heat exchange.

It should be noted that, the end cap assembly 100 is disposed on the battery, and the pole 12 is disposed not in direct contact with the cover plate 11, so as to avoid the battery from generating a short circuit.

It can be understood that the pole 12 is in contact with the electric core in the battery, the heat of the electric core can be conducted to the pole 12, and the pole 12 is communicated with the space outside the battery, so that the heat of the pole 12 can be dissipated outside the battery, and the heat dissipation of the pole 12 and the inside of the battery is realized.

Therefore, the heat of the pole 12 can be conducted to the cover plate 11 through the heat dissipation piece 13 by arranging the heat dissipation piece 13 and simultaneously contacting the pole 12 and the cover plate 11, the cover plate 11 has higher heat conductivity, and the area of the cover plate 11 on the outer surface of the battery is larger, so that the heat of the cover plate 11 can be better dissipated outside the battery.

The end cover assembly 100 of this application, the heat of utmost point post 12 can directly distribute outside the battery, simultaneously, through setting up radiating part 13, the heat of utmost point post 12 can be conducted to apron 11 through radiating part 13 to make apron 11 also can participate in the heat dissipation of utmost point post 12, increased the heat dissipation route of utmost point post 12, can improve the radiating efficiency of utmost point post 12, also increased the radiating route that the battery core passes through utmost point post 12, can improve the holistic radiating efficiency of battery.

The material having a thermal conductivity of less than 0.2W/(m·k) is a heat insulating material and is unfavorable for heat dissipation, and the material of the heat sink 13 is a material having a thermal conductivity of more than 0.2W/(m·k).

In some embodiments, the heat dissipation member 13 is made of pp+boron nitride, and the pp+boron nitride is made of pp+boron nitride by adding a boron nitride component into PP, so that the thermal conductivity of pp+boron nitride can be increased to 0.5W/(m·k), thereby ensuring that the heat dissipation member 13 has sufficient thermal conductivity to conduct heat to the pole 12.

In some embodiments, the pole 12 comprises: an upper pole and a lower pole, the lower pole being adjacent to the inner side S2 of the cover plate 11, the upper pole being adjacent to the outer side S1 of the cover plate 11. The projection of the upper pole on the lower pole is positioned in the lower pole, the heat dissipation piece 13 is in contact heat exchange with the lower pole, and the heat dissipation piece 13 is positioned outside the projection range of the upper pole on the lower pole.

Therefore, the heat of the battery core is firstly conducted to the lower pole, and the heat of the lower pole can be transferred to the outside of the battery through the upper half pole, and meanwhile, the heat of the lower pole can also be conducted to the cover plate 11 through the heat dissipation piece 13 and finally transferred to the outside of the battery. Therefore, the lower pole is provided with two different heat dissipation paths, and the heat dissipation part 13 can increase one heat dissipation path while not changing the heat dissipation path of the original upper half pole, so that the heat dissipation efficiency of the lower pole is improved, namely the heat dissipation efficiency of the battery cell is improved.

In some embodiments, as shown in fig. 1-3, the end cap assembly 100 further includes: the lower plastic 14, the lower plastic 14 is attached to the inner side surface S2 of the cover plate 11 and is used for fixing the heat dissipation member 13, and the heat dissipation member 13 is disposed on the inner side surface S2 of the cover plate 11 and is in contact heat exchange with at least the inner side surface S2 of the cover plate 11.

Thereby, the heat sink 13 is disposed on the inner side surface S2 of the cover 11 through the lower plastic 14, and after the heat of the pole 12 is transferred to the heat sink 13, the heat of the heat sink 13 can be transferred from the inner side surface S2 of the cover 11 to the cover 11. Since the heat of the cover 11 is emitted into the air at the outer side S1 thereof, the transfer direction of the heat in the cover 11 is along the thickness direction of the cover 11, and the thickness of the cover 11 is small, i.e., the conduction path of the heat in the cover 11 is short, so that the cover 11 can have high heat dissipation efficiency.

In some embodiments, as shown in fig. 1-3, the end cap assembly 100 further includes: the upper plastic 15, the upper plastic 15 is disposed on the outer side surface S1 of the cover plate 11, the upper plastic 15 has a post via 151, the post 12 passes through the post via 151, and the heat dissipation element 13 is located outside the orthographic projection range of the post via 151 on the cover plate 11.

Thus, the pole 12 is fixed in the pole via 151, and the upper plastic 15 is fixed on the cover 11, so as to realize the fixed arrangement of the pole 12 on the cover 11.

It will be appreciated that the heat transfer path within the pole 12 is transferred out of the battery along the portion of the pole 12 within the pole via 151.

Therefore, the heat dissipation member 13 is disposed outside the range of the pole via 151, so that the heat conduction path of the pole 12 through the heat dissipation member 13 will not affect the original heat conduction and dissipation path of the pole 12, which is equivalent to adding a heat conduction and dissipation path of the pole 12 on the original path, thereby improving the heat conduction and dissipation efficiency of the pole 12.

Further, the end cap assembly 100 further includes: the sealing element 16 is sleeved on the pole 12, and is positioned between the pole 12 and the heat dissipation element 13.

It will be appreciated that the pole 12 is threaded through the cover plate 11, i.e. the seal 16 is located between the pole 12 and the cover plate 11. Thereby, the sealing member 16 can improve the sealability between the cap plate 11 and the electrode post 12 to reduce or prevent the generation of liquid leakage at the electrode post 12 by the electrolyte inside the battery or the like. Meanwhile, the sealing member 16 is an insulating material, that is, the sealing member 16 can also function to isolate the electrode post 12 from the cap plate 11, thereby maintaining an insulating arrangement between the cap plate 11 and the electrode post 12.

In addition, the sealing member 16 can isolate the pole 12 and the heat dissipation member 13 in the radial direction of the pole 12, so that the heat conduction path of the pole 12 along the axial direction thereof is not affected by the heat dissipation member 13, and thus the heat conduction and dissipation path of the pole 12 and the heat conduction and dissipation path of the pole 12 through the heat dissipation member 13 and the cover plate 11 are kept independent, so as to ensure the stable heat dissipation effect of the two heat dissipation paths on the pole 12.

Further, the heat sink 13 is spaced apart from the sealing member 16 to form a relief space V1 for relieving deformation of the sealing member 16.

It will be appreciated that, in order to ensure the sealing effect of the seal 16, the seal 16 is typically an interference fit between the post 12 and the cover plate 11, and the seal 16 is subject to deformation under the pressure of the interference fit,

therefore, when the sealing element 16 deforms, the avoiding space V1 can accommodate the volume change of the sealing element 16 caused by deformation, so that the deformation of the sealing element 16 is reduced or avoided to squeeze the heat dissipation element 13, namely, the deviation of the setting position of the heat dissipation element 13 is reduced or avoided under the extrusion of the sealing element 16, the contact between the heat dissipation element 13 and the pole 12 and the cover plate 11 can be kept stable, and the heat dissipation element 13 can play a stable heat conduction effect between the pole 12 and the cover plate 11.

Specifically, the cover plate 11 has a flange portion 111 extending toward the pole 12, a limiting portion 112 is disposed on a side of the flange portion 111 facing the upper plastic 15, the limiting portion 112 is in limiting fit with the upper plastic 15, and the flange portion 111 is adapted to press against the sealing member 16.

Therefore, the upper plastic 15 is matched with the limiting part 112 to limit the installation position of the upper plastic 15 on the cover plate 11, namely, the position of the pole 12 penetrating through the cover plate 11 can be limited. Meanwhile, the flange 111 presses against the sealing member 16 to define the arrangement position of the sealing member 16 relative to the cover plate 11, so that the arrangement positions of the pole 12 and the sealing member 16 relative to the cover plate 11 can be defined, thereby reducing or avoiding movement of the sealing member 16 or the pole 12 relative to the cover plate 11, and ensuring sealing and insulation stability between the pole 12 and the cover plate 11.

In some embodiments, as shown in fig. 4-7, the heat sink 13 is annular, and the heat sink 13 includes: the first ring body 131 and the second ring body 132 are sequentially arranged in the axial direction of the pole 12, the outer diameter of the first ring body 131 is smaller than the outer diameter of the second ring body 132 to define a step surface S3, the lower plastic 14 is provided with a limit flange 141 extending towards the pole 12, the limit flange 141 is erected on the step surface S3, the first ring body 131 is in contact with the cover plate 11, and the second ring body 132 is in contact with the pole 12.

Therefore, the position of the heat sink 13 relative to the lower plastic 14 can be limited by the positioning flange 141 being set on the step surface S3, so as to improve the connection stability between the heat sink 13 and the lower plastic 14. The contact surface between the second ring 132 and the pole 12 is larger, so that the heat conduction area between the heat dissipation element 13 and the pole 12 can be increased, and the heat conduction efficiency between the heat dissipation element 13 and the pole 12 is improved, namely, the heat dissipation effect of the heat dissipation element 13 on the pole 12 is improved.

In some embodiments, as shown in fig. 8 and 9, the lower plastic 14 is provided with heat exchange holes 142.

Therefore, the heat in the battery such as the battery core can be directly conducted to the cover plate 11 through the heat exchange holes 142, so that the heat in the battery can be dissipated to the outside of the battery through the cover plate 11, and the heat dissipation effect in the battery is improved. In addition, by forming the heat exchange holes 142 in the lower plastic 14, the volume of the lower plastic 14 can be reduced, i.e. the material cost of the lower plastic 14 can be reduced.

In the present application, the size, shape and number of the heat exchange holes 142 formed in the lower plastic 14 are not limited. For example, in the example of fig. 8, two square heat exchange holes 142 are formed in the lower plastic 14. For another example, in the example of fig. 9, a plurality of circular apertures are provided in the lower plastic 14.

In some embodiments, the lower plastic 14 is made of a material having a thermal conductivity greater than 0.2W/(mK), so that the lower plastic 14 also has a better thermal conductivity.

It will be appreciated that the lower plastic 14 is disposed between the cover 11 and the battery cell so that insulation between the cover 11 and the battery cell can be maintained.

Therefore, heat of the internal structure of the battery such as the battery core can be directly conducted to the cover plate 11 through the lower plastic 14 besides heat dissipation through the pole 12, and the contact area between the lower plastic 14 and the cover plate 11 is large, so that the heat dissipation efficiency between the lower plastic 14 and the cover plate 11 is high, and the heat dissipation effect in the battery is improved.

As shown in fig. 10, a battery 1000 according to an embodiment of the present utility model includes: housing 300, cell 200, and end cap assembly 100.

The housing 300 has an opening, the battery cell 200 is accommodated in the housing 300, the end cap assembly 100 is the end cap assembly 100 of the above embodiment, and the end cap assembly 100 covers the opening.

The battery 1000 of this application through adopting the end cover assembly 100 of above-mentioned embodiment, the heat of utmost point post 12 can directly distribute outside battery 1000, simultaneously, through setting up radiating member 13, the heat of utmost point post 12 can be conducted to apron 11 through radiating member 13 to make apron 11 also can participate in the heat dissipation of utmost point post 12, increased the heat dissipation route of utmost point post 12, can improve the radiating efficiency of utmost point post 12, also increased the radiating route of electricity core 200 through utmost point post 12, can improve the holistic radiating efficiency of battery 1000, reduce the thermal runaway risk of battery 1000.

The housing 300 of the present embodiment may have a square structure, a circular structure, or other shapes. The case 300 has an inner space accommodating the battery cell 200, one end of the case 300 has an opening communicating with the inner space, and the cap assembly 100 is coupled with the case 300 to seal the opening. Alternatively, the case 300 may be manufactured using a conductive material such as aluminum or an aluminum alloy.

The energy storage device 2000 according to the embodiment of the present utility model includes the battery 1000 of the above embodiment.

The utility model provides an energy memory 2000 through adopting the battery 1000 of above-mentioned embodiment, the heat of utmost point post 12 can directly distribute outside battery 1000, simultaneously, through setting up radiating member 13, the heat of utmost point post 12 can be conducted to apron 11 through radiating member 13, thereby make apron 11 also can participate in the heat dissipation of utmost point post 12, the heat dissipation route of utmost point post 12 has been increased, the radiating efficiency of utmost point post 12 can be improved, the radiating route of battery cell 200 through utmost point post 12 has also been increased, the holistic radiating efficiency of battery 1000 can be improved, and then the holistic radiating efficiency of energy memory 2000 is improved, reduce the thermal runaway risk of energy memory 2000.

Alternatively, energy storage device 2000 may include, but is not limited to, a single battery, a battery module, a battery pack, a battery system, and the like. The practical application form of the energy storage device 2000 provided in the embodiment of the present application may be, but is not limited to, the listed products, and may also be other application forms, and the embodiment of the present application does not strictly limit the application form of the energy storage device 2000.

In some embodiments, as shown in fig. 11, the energy storage device 2000 further includes a battery box 1100, and a plurality of batteries 1000 are mounted and arranged on the battery box 1100, so as to implement intensive arrangement of the batteries 1000.

It can be appreciated that, because the arrangement among the plurality of batteries 1000 is relatively tight, by adopting the battery 1000 of the above embodiment, the battery 1000 can better emit internal heat through the cover plate 11, so as to improve the heat dissipation efficiency of the plurality of batteries 1000, further improve the overall heat dissipation efficiency of the energy storage device 2000, and reduce the thermal runaway risk of the energy storage device 2000.

Other constructions and operations of the end cap assembly 100, the battery 1000, and the energy storage device 2000 according to embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An end cap assembly, comprising:

a cover plate (11), wherein the cover plate (11) has an outer side surface S1 and an inner side surface S2 which are opposite in the thickness direction of the cover plate;

a pole (12), wherein the pole (12) is penetrated through the cover plate (11);

the heat dissipation piece (13), heat dissipation piece (13) are located between utmost point post (12) and apron (11), and at least one side surface of heat dissipation piece (13) with utmost point post (12) contact heat transfer, at least opposite side surface with apron (11) contact heat transfer.

2. The end cap assembly of claim 1, wherein the end cap assembly (100) further comprises: the lower plastic (14), lower plastic (14) attach in the medial surface S2 of apron (11), and be used for fixed radiating piece (13), radiating piece (13) set up in medial surface S2 of apron (11), and with at least the medial surface S2 contact heat transfer of apron (11).

3. The end cap assembly of claim 1, wherein the end cap assembly (100) further comprises: go up plastic (15), go up plastic (15) set up in lateral surface S1 of apron (11), go up plastic (15) have utmost point post via hole (151), utmost point post (12) wear to establish utmost point post via hole (151), heat dissipation piece (13) are located utmost point post via hole (151) are in the orthographic projection scope of apron (11).

4. The end cap assembly of claim 3, further comprising: and the sealing piece (16) is sleeved on the pole (12) and is positioned between the pole (12) and the heat radiating piece (13).

5. End cap assembly according to claim 4, wherein the heat sink (13) is spaced from the seal (16) to form a relief space V1 that is relieved of deformation of the seal (16).

6. End cap assembly according to claim 4, wherein the cover plate (11) has a flange portion (111) extending towards the pole (12), the flange portion (111) being provided with a stop portion (112) on the side facing the upper plastic (15), the stop portion (112) being in a stop fit with the upper plastic (15), the flange portion (111) being adapted to press against the seal (16).

7. End cap assembly according to claim 2, wherein the heat sink (13) is annular, the heat sink (13) comprising: the axial direction of utmost point post (12) is last first ring body (131) and second ring body (132) that set gradually, the external diameter of first ring body (131) is less than the external diameter of second ring body (132) is in order to inject step surface S3, lower plastic (14) have orientation utmost point post (12) extension limit flange (141), limit flange (141) set up in step surface S3, first ring body (131) with apron (11) contact, second ring body (132) with utmost point post (12) contact.

8. The end cap assembly of claim 2, wherein the lower plastic (14) is provided with heat exchange holes (142).

9. A battery, comprising:

a housing (300), the housing (300) having an opening;

-a battery cell (200), the battery cell (200) being housed within the housing (300);

end cap assembly (100), the end cap assembly (100) being an end cap assembly (100) according to any one of claims 1-8, the end cap assembly (100) being arranged to cover the opening.

10. An energy storage device, characterized by comprising a battery (1000) as claimed in claim 9.