WO2024094179A1

WO2024094179A1 - End cover assembly of battery, battery cell, energy storage device, and electrical apparatus

Info

Publication number: WO2024094179A1
Application number: PCT/CN2023/129627
Authority: WO
Inventors: 张亮亮; 熊永锋; 阳明; 徐卫东
Original assignee: 厦门海辰储能科技股份有限公司
Priority date: 2022-11-04
Filing date: 2023-11-03
Publication date: 2024-05-10
Also published as: CN218827490U

Abstract

Disclosed in the present solution are an end cover assembly of a battery, a battery cell, an energy storage device, and an electrical apparatus. The end cover assembly (100) comprises a cover plate (10) and a pole (20). Two opposite sides of the cover plate (10) are a cover inner side (11) and a cover outer side (12); the cover plate (10) is provided with a protrusion (13) on at least one side surface of the cover inner side (11) and the cover outer side (12); the protrusion (13) is annular; the area surrounded by the protrusion (13) is a recess (15); the cover plate (10) is provided with a liquid injection hole (14) penetrating in the thickness direction of the cover plate (10); and the liquid injection hole (14) is located in the recess (15). The pole (20) is sealingly connected to the interior of the liquid injection hole (14).

Description

Battery end cap assembly, battery monomer, energy storage device and electrical equipment

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure is based on Chinese patent application No. 2022229769479 (application date is 2022-11-04), and claims the priority of the above-mentioned Chinese patent application. The entire contents of the above-mentioned Chinese patent application are hereby introduced into the present disclosure as a reference.

Technical Field

The present disclosure relates to the field of batteries, and in particular to an end cover assembly of a battery, a battery cell, an energy storage device and an electrical equipment.

Background technique

The battery usually includes a shell, an end cover and a battery cell. The shell is used to place the battery cell, and the end cover is arranged at the end of the shell to close the battery. In the prior art, the end cover of the battery usually adopts a flat plate structure, and the structural strength of the flat plate end cover is relatively low. In addition, the end cover usually needs to be separately provided with a liquid injection hole and an electrode column. The large number of openings reduces the structural strength of the end cover, which is easy to be damaged when the battery collides, posing a great safety hazard.

Summary of the invention

The present disclosure aims to solve at least one of the technical problems existing in the prior art. To this end, the present disclosure provides an end cap assembly of a battery, which has fewer openings, higher structural strength and higher safety.

The present disclosure also aims to provide a battery cell having the end cover assembly.

The present disclosure also aims to provide an energy storage device having the above-mentioned battery.

The present disclosure also aims to provide an electrical device having the above energy storage device.

According to the end cap assembly of the battery of the embodiment of the present disclosure, the end cap assembly comprises: a cover plate and an electrode column. The opposite sides of the cover plate are the inner side of the cover and the outer side of the cover, the cover plate is provided with a convex portion on at least one surface of the inner side of the cover and the outer side of the cover, the convex portion is annular, and the area surrounded by the convex portion is a concave portion, the cover plate is provided with a liquid injection hole penetrating along the thickness direction of the cover plate, the liquid injection hole is located in the concave portion; the electrode column is sealed and connected in the liquid injection hole.

According to the end cap assembly of the battery in the embodiment of the present disclosure, the end cap assembly is arranged at the end of the battery, the side of the cover plate facing the outside of the battery is the outside of the cover, and the side of the cover plate facing the inside of the battery is the inside of the cover. A convex portion is arranged on the cover plate, and the area surrounded by the convex portion constitutes a concave portion. The convex portion and the concave portion are respectively arranged on the surface of the inside of the cover and/or the outside of the cover, which can increase the structural strength of the cover plate and make the cover plate less likely to deform when subjected to impact. After the battery is injected with electrolyte through the injection hole, the injection hole can be sealed by the electrode column. The electrode column can also complete the current conduction work of the battery as a seal, which can reduce the number of openings on the cover plate, thereby increasing the structural strength of the cover plate. Therefore, by providing a convex portion on the cover plate As well as reducing the number of openings, the structural strength of the cover plate can be increased, thereby making the end cover assembly more reliable and improving safety.

According to a battery cell of an embodiment of the second aspect of the present disclosure, the battery cell comprises: a shell, a winding core and an end cover assembly of the battery described in any one of the above embodiments, the shell has an opening; the winding core is accommodated in the shell; the end cover assembly covers the opening, the inner side of the cover of the cover plate is arranged toward the winding core, and the electrode column is connected and conductive to the winding core.

According to the battery cell of the second aspect of the present disclosure, by installing the above-mentioned end cover assembly on the battery cell, the structural strength of the battery cell can be increased while the structure of the battery cell can be made simpler, thereby improving the safety of the battery cell.

An energy storage device according to an embodiment of the third aspect of the present disclosure includes the battery cell in the above embodiment.

The energy storage device according to the embodiment of the present disclosure uses the above-mentioned battery cell, which is beneficial to improving the safety of the energy storage device.

The electrical equipment according to the embodiment of the fourth aspect of the present disclosure includes the energy storage device in the above embodiment.

According to the electrical equipment of the embodiment of the present disclosure, the safety of the electrical equipment is increased by adopting the above-mentioned energy storage device.

Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present disclosure will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG. 1 is a cross-sectional view of an end cap assembly according to an embodiment of the present disclosure.

FIG. 2 is a top view of a cover plate of an end cap assembly according to an embodiment of the present disclosure.

FIG3 is a cross-sectional view of a battery cell according to an embodiment of the second aspect of the present disclosure.

FIG. 4 is a schematic diagram of an electrical device according to an embodiment of the fourth aspect of the present disclosure.

Reference numerals:
Battery cell 1, end cap assembly 100, cover plate 10, cover inner side 11, cover outer side 12, convex portion 13, injection hole 14,
The recess 15 , the edge 16 , the electrode column 20 , the sealing ring 30 , the shell 200 , the opening 210 , the winding core 300 , the energy storage device Y, and the electrical equipment Z.

Detailed ways

Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and cannot be understood as limiting the present disclosure.

In the description of the present disclosure, it is to be understood that the terms "center", "upper", "lower", "inner", and "outer" are used to represent the The orientation or positional relationship indicated by the above is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

The end cap assembly 100 of a battery, a battery cell 1, an energy storage device Y, and an electrical device Z according to an embodiment of the present disclosure are described below with reference to FIGS. 1 to 4 .

As shown in FIG. 1 and FIG. 2 , the end cap assembly 100 of a battery according to an embodiment of the present disclosure includes: a cover plate 10 and an electrode column 20 .

The two opposite sides of the cover plate 10 are the cover inner side 11 and the cover outer side 12. The cover plate 10 is provided with a convex portion 13 on at least one surface of the cover inner side 11 and the cover outer side 12. The convex portion 13 is annular, and the area surrounded by the convex portion is a concave portion 15. The cover plate 10 is provided with a liquid injection hole 14 that passes through the cover plate 10 in the thickness direction, and the liquid injection hole 14 is located in the concave portion 15. The electrode column 20 is sealed and connected in the liquid injection hole 14.

Specifically, the end cover assembly 100 is arranged at the end of the battery, the side of the cover plate 10 facing the outside of the battery is the cover outer side 12, and the side of the cover plate 10 facing the inside of the battery is the cover inner side 11. A convex portion 13 is arranged on the cover plate 10, and the area surrounded by the convex portion 13 constitutes a concave portion 15. The convex portion 13 and the concave portion 15 are respectively arranged on the surface of the cover inner side 11 and/or the cover outer side 12, which can increase the structural strength of the cover plate 10 and make the cover plate 10 not easily deformed when subjected to impact.

When the battery is produced, it is necessary to inject electrolyte into the assembled battery. Usually, a separate injection hole 14 is opened on the cover plate 10, and the electrolyte is injected into the battery through the injection hole 14. After the injection is completed, the injection hole 14 is sealed with a sealing nail to prevent leakage of the electrolyte. While opening the injection hole 14, an opening for installing the electrode column 20 is also required to be opened on the surface of the cover plate 10. Opening multiple holes on the surface of the cover plate 10 will reduce the structural strength of the cover plate 10, making the cover plate 10 prone to damage. In the present disclosure, after the electrolyte is injected into the battery, by sealing the electrode column 20 in the injection hole 14, the current can be conducted through the electrode column 20 while the injection hole 14 is sealed, so that the number of openings on the cover plate 10 can be reduced, thereby increasing the structural strength of the cover plate 10.

According to the end cap assembly 100 of the battery of the embodiment of the present disclosure, by providing the convex portion 13 and the concave portion 15 on the cover plate 10 and reducing the number of openings, the structural strength of the cover plate 10 can be increased, thereby making the end cap assembly 100 more reliable and improving safety.

It can be understood that the specific position of the protrusion 13 on the cover plate 10 may include multiple schemes, for example: the protrusion 13 may be set on the inner side 11 of the cover plate 10, or on the outer side 12 of the cover plate 10, or on both the inner side 11 and the outer side 12 of the cover plate 10, so as to improve the structural strength of the cover plate 10. Accordingly, the recess 15 formed by the area surrounded by the protrusion 13 may have different schemes according to different settings of the protrusion 13, and can be set according to actual needs.

The concave portion 15 formed by the convex portion 13 is provided with a liquid injection hole 14, when the electrolyte is injected into the battery, The electrolyte overflowing from the injection hole 14 can be temporarily accumulated in the recess 15, preventing the electrolyte from overflowing the cover plate 10, thereby increasing safety. The protrusion 13 is formed in a ring shape, which can further increase the structural strength of the cover plate 10 and improve safety.

It should be noted that there is no specific limitation on the shape of the protrusion 13. The protrusion 13 can be a circular ring with a circular outer contour, a ring with a square outer contour, or even a ring with a triangular outer contour, which can be selected according to the specific shape of the battery.

In some embodiments, the protrusion 13 is formed on the cover plate 10 by integral stamping. The protrusion 13 is formed by a portion of the cover plate 10 protruding from one side of the cover inner side 11 and the cover outer side 12 to the other side of the cover inner side 11 and the cover outer side 12.

Specifically, before the cover plate 10 is stamped, the cover plate 10 is a flat plate structure, and the structural strength of the cover plate 10 is low at this time, and it is easy to be damaged when it is impacted. When the cover plate 10 is stamped, the cover plate 10 will protrude from the inner side 11 of the cover to the outer side 12 of the cover, or from the outer side 12 of the cover to the inner side 11 of the cover, to form a convex portion 13. At this time, the cross section of the cover plate 10 is a shape that protrudes to one side. At this time, the cover plate 10 has stronger pressure resistance and impact resistance, stronger structural strength, and can improve safety. In addition, by stamping the cover plate 10 in one piece, the processing efficiency is higher and the processing cost is lower.

Therefore, through integrated stamping, the structural strength of the cover plate 10 can be improved while reducing the processing cost.

It can be understood that the cross-sectional shape of the cover plate 10 is related to the outer contour of the stamping die used for integrated stamping. The shape of the stamping die can be adjusted as needed. For example, the shape of the stamping die can be wavy, and the cross-sectional shape of the cover plate 10 after stamping is also wavy, which can further increase the structural strength of the cover plate 10.

In some embodiments, the end cap assembly 100 of the battery further includes a sealing ring 30 sleeved on the edge of the cover plate 10 .

Specifically, when the battery is assembled, the end cover assembly 100 needs to be connected to the battery shell 200. A sealing ring 30 is set at the edge of the cover plate 10 to increase the sealing between the end cover assembly 100 and the shell 200, prevent the electrolyte from leaking from the connection between the two, and thus improve the reliability of the battery.

Optionally, the cover plate 10 is a metal plate, and the sealing ring 30 is an insulating member.

Specifically, the electrode column 20 is sealed and connected at the injection hole 14 and contacts the cover plate 10. During the use of the battery, the electrode column 20 is used to conduct current for the battery. At this time, there is also current on the cover plate 10. The cover plate 10 is covered on the shell 200. The sealing ring 30 between the cover plate 10 and the shell 200 is set as an insulating part to prevent a short circuit between the shell 200 and the cover plate 10.

Thereby, the safety of the battery can be improved.

It should be noted that the material of the sealing ring 30 is not specifically limited here. The sealing ring 30 can be made of rubber or polytetrafluoroethylene, which can be selected according to actual needs.

As shown in FIG. 1 and FIG. 2, further, the edge of the cover plate 10 is an edge portion 16, the edge portion 16 is arranged around the convex portion 13, and the sealing ring 30 is arranged on the edge portion 16. The end cap assembly 100 can be connected to the battery housing 200 through the edge portion 16 of the cover plate 10, so that the battery housing 200 forms an insulating seal. The edge portion 16 can limit the sealing ring 30, so that the sealing ring 30 is not easy to slip off and fall off, thereby improving the sealing insulation between the cover plate 10 and the housing 200.

As shown in FIG3 , a battery cell 1 according to an embodiment of the second aspect of the present disclosure comprises: a housing 200, a winding core 300 and an end cap assembly 100 of a battery according to any of the above embodiments, wherein the housing 200 has an opening 210. The core 300 is accommodated in the housing 200. The end cap assembly 100 covers the opening 210, the cover inner side 11 of the cover plate 10 is arranged toward the winding core 300, and the electrode column 20 is connected to the winding core 300.

According to the battery cell 1 of the second embodiment of the present disclosure, by installing the above-mentioned end cover assembly 100 on the battery cell 1, the structural strength of the battery cell 1 can be increased while the structure of the battery cell 1 can be made simpler, thereby improving the safety of the battery cell 1.

Furthermore, the battery cell 1 also includes a current collecting plate, which is arranged in the housing 200, and between the winding core 300 and the cover plate 10. An air storage cavity is arranged in the current collecting plate or between the current collecting plate and the cover plate 10, and a through hole connecting the air storage cavity is arranged on the current collecting plate. The current collecting plate is used to conduct the current in the battery cell 1. When the battery cell 1 collides or fails, and the electrolyte in the battery cell 1 leaks, the electrolyte can flow into the air storage cavity through the through hole on the current collecting plate, and the air storage cavity can be buffered, thereby preventing the electrolyte from damaging the external environment and improving safety.

Optionally, the current collecting plate is a conductor, and one end of the electrode column 20 located on the inner side 11 of the cover is connected to the current collecting plate. After the battery cell 1 is packaged, the electrode column 20 is sealed and connected in the injection hole 14, so that the battery cell 1 has good sealing. The electrode column 20 is connected and connected to the current collecting plate, so that the current in the battery cell 1 can be led out, so that the battery cell 1 completes the discharge.

The energy storage device Y according to the embodiment of the third aspect of the present disclosure includes the battery cell 1 in the above embodiment.

Specifically, the energy storage device Y may include a battery box on which a plurality of battery cells 1 are mounted and arranged to achieve a concentrated arrangement of the battery cells 1. When the energy storage device Y includes a plurality of battery cells 1, and each battery cell 1 adopts the above structure, the structural strength of the energy storage device Y can be increased, thereby improving safety.

According to the energy storage device Y of the embodiment of the present disclosure, by adopting the above-mentioned battery, the safety of the energy storage device Y is improved.

As shown in FIG. 4 , the electrical equipment Z according to the embodiment of the fourth aspect of the present disclosure includes the energy storage device Y in the above embodiment.

In the disclosed solution, the structure of the electric device Z is not limited. For example, the electric device Z can be a mobile device such as a vehicle, a ship, a small aircraft, etc., which includes a power source, and the power source includes the above-mentioned energy storage device Y. The electric energy provided by the energy storage device Y provides driving force for the electric device Z. The mobile device can be a pure electric device, that is, the driving force of the electric device Z is all electric energy, and the power source only includes the energy storage device Y. The mobile device can also be a hybrid power device, and the power source includes the energy storage device Y and other power devices such as an engine. Taking the vehicle shown in Figure 4 as an example, in some embodiments, the electric device Z is a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, an electric tricycle or a two-wheeled electric vehicle, etc.

For another example, the electrical equipment Z is an energy storage device such as an energy storage cabinet, which can be used as a charging cabinet for mobile devices or as an energy storage device for other devices. For example, solar power generation equipment can be equipped with an energy storage cabinet, and the electricity generated by solar power generation is temporarily stored in the energy storage cabinet to power street lamps, bus stops and other devices.

According to the electric device Z of the embodiment of the present disclosure, the safety of the electric device Z is increased by adopting the above-mentioned energy storage device Y.

In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that a specific feature, structure, material or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Although embodiments of the present disclosure have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

A battery end cap assembly, characterized by comprising:

A cover plate, wherein two opposite sides of the cover plate are a cover inner side and a cover outer side, the cover plate is provided with a convex portion on at least one surface of the cover inner side and the cover outer side, the convex portion is annular, and the area surrounded by the convex portion is a concave portion, and the cover plate is provided with a liquid injection hole penetrating along the thickness direction of the cover plate, and the liquid injection hole is located in the concave portion;

An electrode column is sealed and connected in the injection hole.
The end cover assembly of the battery according to claim 1 is characterized in that the convex portion is formed on the cover plate by integral stamping; and the convex portion is formed by a part of the cover plate protruding from one side of the inner side of the cover and the outer side of the cover to the other side of the inner side of the cover and the outer side of the cover.
The end cover assembly of a battery according to claim 1 or 2, characterized in that the cover plate is a circular plate, the convex portion is annular, and the injection hole is located at the center of the concave portion.
The end cover assembly of a battery according to any one of claims 1 to 3, further comprising a sealing ring sleeved on the edge of the cover plate.
The end cover assembly of the battery according to claim 4, characterized in that the cover plate is a metal plate and the sealing ring is an insulating member.
The end cover assembly of the battery according to claim 4 is characterized in that the edge of the cover plate is an edge portion, the edge portion is arranged around the convex portion, and the sealing ring is arranged on the edge portion.
A battery cell, characterized by comprising:

a housing having an opening;

A winding core, contained in the shell;

According to any one of claims 1 to 6, the end cap assembly of the battery covers the opening, the inner side of the cover of the cover plate is arranged toward the winding core, and the electrode column is connected and conductive to the winding core.
The battery cell according to claim 7, further comprising:

A collecting disk is arranged in the shell, the collecting disk is located between the winding core and the cover plate, an air storage cavity is provided in the collecting disk or between the collecting disk and the cover plate, and a through hole connected to the air storage cavity is provided on the collecting disk.
The battery cell according to claim 8, characterized in that the current collecting disk is a conductor, and one end of the electrode column located on the inner side of the cover is connected to the current collecting disk.
An energy storage device, characterized by comprising a battery cell according to any one of claims 7 to 9.
An electrical equipment, characterized by comprising the energy storage device according to claim 10.