CN116598729A

CN116598729A - End cover assembly, battery cell, battery assembly and energy storage system

Info

Publication number: CN116598729A
Application number: CN202310851851.6A
Authority: CN
Inventors: 李茂松
Original assignee: Shenzhen Haichen Energy Storage Control Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Shenzhen Haichen Energy Storage Control Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-07-12
Filing date: 2023-07-12
Publication date: 2023-08-15

Abstract

The application provides an end cover assembly, a battery cell, a battery assembly and an energy storage system. The end cap assembly includes: the top cover is provided with a first surface and a second surface which are arranged opposite to each other; the positive pole is arranged on the top cover in a penetrating way, the top of the positive pole is exposed out of the first surface, and the negative pole is arranged on the top cover in a penetrating way, and the top of the negative pole is exposed out of the first surface; the upper plastic comprises positive pole upper plastic and negative pole upper plastic, wherein the positive pole upper plastic is arranged around the outer peripheral surface of the top of the positive pole post, the top surface of the positive pole upper plastic is provided with a first positive pole mark, the negative pole upper plastic is arranged around the outer peripheral surface of the top of the negative pole post, and the top surface of the negative pole upper plastic is provided with a first negative pole mark; the top patch is attached to the first surface, the position, close to the plastic on the positive electrode, on the top patch is provided with a second positive electrode mark, and the position, close to the plastic on the negative electrode, on the top patch is provided with a second negative electrode mark, so that a machine or an operator can intuitively identify the polarity of the pole, and production efficiency is improved.

Description

End cover assembly, battery cell, battery assembly and energy storage system

Technical Field

The application relates to the field of electronics, in particular to an end cover assembly, a battery cell, a battery assembly and an energy storage system.

Background

In the field of energy storage batteries, whether the positive electrode and the negative electrode of a pole in the energy storage battery can be accurately identified or not is related to important aspects such as installation accuracy, production efficiency and operation safety of the energy storage battery. In conventional energy storage batteries, positive/negative electrode marks are usually disposed on the upper plastic surface surrounding the pole, so as to mark and distinguish the polarity of the pole. However, the positive/negative electrode label disposed on the upper plastic has a problem of low identification, which limits the improvement of the production efficiency of the energy storage battery.

Disclosure of Invention

In view of the above problems, the embodiments of the present application provide an end cap assembly, a battery cell, a battery assembly, and an energy storage system, so that a machine or an operator can intuitively identify the polarity of the pole.

Embodiments of the first aspect of the present application provide an end cap assembly comprising:

the top cover is provided with a first surface and a second surface which are arranged opposite to each other;

the positive pole is arranged on the top cover in a penetrating mode, the top of the positive pole is exposed out of the first surface, and the negative pole is arranged on the top cover in a penetrating mode, and the top of the negative pole is exposed out of the first surface;

The upper plastic comprises positive pole upper plastic and negative pole upper plastic, the positive pole upper plastic surrounds the outer peripheral surface of the top of the positive pole post, the bottom surface of the positive pole upper plastic is attached to the first surface, the top surface of the positive pole upper plastic is provided with a first positive pole mark, the negative pole upper plastic surrounds the outer peripheral surface of the top of the negative pole post, the bottom surface of the negative pole upper plastic is attached to the first surface, and/or the top surface of the negative pole upper plastic is provided with a first negative pole mark;

the top patch is attached to the first surface, a second anode mark is arranged on the top patch at a position close to the plastic on the anode, and/or a second cathode mark is arranged on the top patch at a position close to the plastic on the cathode.

Optionally, the second positive electrode mark has a maximum width D of orthographic projection on the first surface ₁ The maximum width of the orthographic projection of the first positive electrode mark on the first surface is D ₂ The maximum width D ₁ And the maximum width D ₂ The method meets the following conditions: d is more than or equal to 1.5 ₁ /D ₂ ≤1.8；

The maximum width of the orthographic projection of the second negative electrode mark on the first surface is D ₃ The front projection of the first negative mark on the first surface 1111 has a maximum width D ₄ The maximum width D ₃ And the maximum width D ₄ The method meets the following conditions: d is more than or equal to 1.5 ₃ /D ₄ ≤1.8。

Optionally, a perpendicular line from the center point of the first positive electrode mark to the central axis of the positive electrode post is a first connecting line, and a perpendicular line from the center point of the second positive electrode mark to the central axis of the positive electrode post is a second connecting line, wherein an included angle between the second connecting line and the first connecting line is 80-90 degrees; and/or the number of the groups of groups,

the perpendicular line from the central point of the first negative electrode mark to the central axis of the negative electrode column is a third connecting line, and the perpendicular line from the central point of the second negative electrode mark to the central axis of the negative electrode column is a fourth connecting line, wherein the included angle between the third connecting line and the fourth connecting line is 80-90 degrees.

Optionally, two first positive electrode marks are arranged on the top surface of the plastic on the positive electrode, and a connecting line of the two first positive electrode marks is intersected with the central axis of the positive electrode post; and/or the number of the groups of groups,

the plastic top surface is equipped with two first negative pole marks on the negative pole, the connecting wire of two first negative pole marks with the axis of negative pole post intersects.

Optionally, the plastic on the positive electrode has a thickness range D ₅ The first positive electrode mark is a groove, the groove is recessed in the surface of the plastic on the positive electrode along the direction of the plastic on the positive electrode pointing to the top cover, and the first positive electrode mark has a dimension range D in the thickness direction of the plastic on the positive electrode ₆ The size range D ₆ And the thickness range D ₅ The ratio of (2) is as follows: d is more than or equal to 0.08 ₆ /D ₅ Less than or equal to 0.1; and/or the number of the groups of groups,

the plastic on the negative electrode has a thickness range D ₇ The first negative electrode mark is a groove, the groove is recessed in the surface of the negative electrode along the direction of the plastic on the negative electrode pointing to the top cover, and the first negative electrode mark has a dimension range D in the thickness direction of the plastic on the negative electrode ₈ The size range D ₈ And the thickness range D ₇ The ratio of (2) is as follows: d is more than or equal to 0.08 ₈ /D ₇ ≤0.1。

Optionally, the second positive electrode mark has a nearest distance range L with the periphery of the plastic on the positive electrode adjacent to the second positive electrode mark ₁ The nearest distance range L ₁ The method meets the following conditions: l is less than or equal to 2mm ₁ Less than or equal to 8mm; and/or the number of the groups of groups,

the second negative electrode mark and the plastic on the negative electrode are adjacent to the periphery of the second negative electrode mark and have a nearest distance range L ₂ The nearest distance range L ₂ The method meets the following conditions: l is less than or equal to 2mm ₂ ≤8mm。

Optionally, the upper plastic is further provided with an injection molding point and a thimble position, the injection molding point is arranged on the surface of the upper plastic, which is away from the top cover, a vertical line from the central point of the injection molding point to the central axis of the pole is a fifth connecting line, and a vertical line from the central point of the first positive electrode mark or the first negative electrode mark to the central axis of the pole is a sixth connecting line, wherein an included angle between the fifth connecting line and the sixth connecting line is 80-90 degrees;

The ejector pin position is arranged on the surface of the upper plastic, which is away from the top cover, a perpendicular line from the center point of the ejector pin position to the central axis of the pole is a seventh connecting line, wherein an included angle between the seventh connecting line and the sixth connecting line is 80-90 degrees, and the ejector pin position and the injection molding point are oppositely arranged on two opposite sides of the central axis of the pole.

Optionally, the second positive electrode mark is an indentation, and the indentation is arranged on the surface of the top patch, which is away from the top cover; and/or the number of the groups of groups,

the second negative electrode mark is an indentation, and the indentation is arranged on the surface of the top patch, which is away from the top cover.

Optionally, the second positive electrode identifier penetrates through the top patch along the thickness direction of the top patch; and/or the number of the groups of groups,

the second negative electrode mark penetrates through the top patch along the thickness direction of the top patch.

Optionally, the top patch has a first color, the end cap assembly further includes a label sheet, the label sheet is disposed on a side of the second positive label and the second negative label adjacent to the top cap, and the first label sheet has a third color, the third color being different from the first color.

Optionally, the second positive electrode identifier is provided with a plurality of edges which are connected in a bending way, and at least two adjacent edges in the plurality of edges are connected through an arc angle; and/or the number of the groups of groups,

the second negative electrode mark is provided with a plurality of edges which are connected in a bending way, and at least two adjacent edges in the plurality of edges are connected through an arc angle.

In a second aspect, the present application provides a battery cell, which includes an electrode assembly, a case, and the end cap assembly, wherein the electrode assembly is disposed in the case, and the end cap assembly is electrically connected to the electrode assembly.

An embodiment of a third aspect of the present application provides a battery assembly, where the battery assembly includes a harness isolation board, a plurality of connection tabs, and a plurality of battery units, where the connection tabs and the battery units are disposed at intervals on two opposite sides of the harness isolation board, and the plurality of battery units are electrically connected through the plurality of connection tabs;

the connecting tab set up in go up the plastic and deviate from one side of top cap, just connect the tab including anodal connection tab and negative pole connection tab, anodal connection tab electricity connect in the positive pole, negative pole connection tab electricity connect in the negative pole post, anodal connection tab be in orthographic projection on the first surface with first anodal sign and at least one of second anodal sign is in orthographic projection on the first surface staggers the setting, just the negative pole is connected the tab orthographic projection on the first surface with at least one of first negative pole sign and second negative pole sign is in orthographic projection on the first surface staggers the setting.

An embodiment of a fourth aspect of the present application provides an energy storage system comprising:

user load;

the electric energy conversion device is used for converting other forms of energy into electric energy, the electric energy conversion device is electrically connected with the user load, and the electric energy converted by the electric energy conversion device is used for supplying power for the user load; and

according to the battery assembly provided by the embodiment of the application, the battery assembly is respectively and electrically connected with the user load and the electric energy conversion device, the battery assembly stores the electric energy converted by the electric energy conversion device, and the battery assembly supplies power for the user load.

According to the end cover assembly, the first positive electrode mark is arranged on the top surface of the plastic on the positive electrode, the first negative electrode mark is arranged on the top surface of the plastic on the negative electrode, the second positive electrode mark is arranged on the top patch at a position close to the plastic on the positive electrode, the second negative electrode mark is arranged on the top patch at a position close to the plastic on the negative electrode, the first positive electrode mark and the second positive electrode mark are both used for marking the polarity of the positive electrode column, the first negative electrode mark and the second negative electrode mark are both used for marking the polarity of the negative electrode column, in order to prevent the problem that the surface exposed by the pole column is oxidized, ash fall and greasy dirt cause the follow-up welding with a connecting bar plate due to long-term contact with air, the first positive electrode mark, the first negative electrode mark and the second negative electrode mark are arranged on the top patch, the second positive electrode mark and the second negative electrode mark are arranged on the top patch, the positive electrode column is prevented from being separated from the surface of the top cover tape (the adhesive tape is not reserved in an end cover assembly product), the positive electrode column is prevented from being formed on the top plastic, the positive electrode mark, the polarity and the polarity of the first positive electrode mark and the second negative electrode mark and the polarity mark are prevented from being covered by the top surface, and the polarity of the positive electrode label is prevented from being damaged, and the polarity recognition column is prevented from being easily produced, and the machine.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an application scenario diagram of an energy storage system provided by an embodiment of the present application;

fig. 2 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

FIG. 3 is a schematic structural view of an end cap assembly provided by an embodiment of the present application;

FIG. 4 is a schematic exploded view of the end cap assembly provided in FIG. 3;

FIG. 5 is a schematic structural view of a cross-section of the end cap assembly provided in FIG. 3 taken along line A-A;

FIG. 6 is a schematic view of a portion of the structure of an end cap assembly provided by an embodiment of the present application;

FIG. 7 is a schematic top view of an end cap assembly according to a first embodiment of the present application;

FIG. 8 is a schematic top view of a second embodiment of an end cap assembly;

FIG. 9 is a schematic top view of an end cap assembly according to a third embodiment of the present application;

FIG. 10 is a schematic view of a plastic on a positive electrode according to an embodiment of the present application;

FIG. 11 is a schematic view of the structure of the section of the plastic on the positive electrode provided in FIG. 10 along line B-B;

FIG. 12 is a schematic view of a plastic on a negative electrode according to an embodiment of the present application;

FIG. 13 is a schematic view of a cross-section of the negative electrode provided in FIG. 12 along line C-C;

FIG. 14 is a schematic top view of an end cap assembly according to a fourth embodiment of the present application;

FIG. 15 is a schematic top view of an end cap assembly according to a fifth embodiment of the present application;

fig. 16 is a schematic bottom view of a top patch according to a sixth embodiment of the present application;

FIG. 17 is a schematic top view of an end cap assembly according to a sixth embodiment of the application;

fig. 18 is a schematic structural diagram of a second positive electrode identifier according to a sixth embodiment of the present application;

fig. 19 is a schematic structural diagram of a second negative electrode label according to a sixth embodiment of the present application.

Reference numerals illustrate:

the energy storage system, the 10-battery unit, the 20-battery assembly, the 30-electric energy conversion device, the 40-wind energy conversion device, the 50-electric network, the 11-end cover assembly, the 13-shell, the 111-top cover, the 112-top patch, the 113-upper plastic, the 114-pole, the 115-identification piece, the 116-connection tab, the 117-liquid injection port, the 118-explosion-proof valve, the 1111-first surface, the 1112-second surface, the 1113-first through hole, the 1121-second positive pole identification, the 1122-second through hole, the 1123-second negative pole identification, the 1131-first positive pole identification, the 1132-third through hole, the 1133-first negative pole identification, the 1134-upper plastic, the 1135-upper plastic, the 1136-injection molding point, the 1137-top pin position, the 1141-positive pole, the 1142-negative pole, the 1161-positive pole connection tab, the 1162-negative pole connection tab, the 113 a-first connecting wire, the 112 a-second connecting wire, the 113 b-third connecting wire, the 1132-fourth connecting wire, the 113 b-third connecting wire, the 113c connecting wire, the seventh connecting wire and the seventh connecting wire.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

It should be noted that, for convenience of explanation, like reference numerals denote like components in the embodiments of the present application, and detailed descriptions of the like components are omitted in the different embodiments for brevity.

Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. It is well known that the main way to generate green electric energy is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources. At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but the problems of strong intermittence and large fluctuation of wind energy, solar energy and the like generally exist, so that the electric network 50 is unstable, electricity consumption peak electricity is insufficient, electricity consumption valley electricity is too much, and unstable voltage can cause damage to the electric power, therefore, the problem of 'wind abandoning and light abandoning' is possibly caused by insufficient electricity consumption requirement or insufficient receiving capability of the electric network 50, and the problem needs to rely on energy storage to be solved. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.

Taking electrochemical energy storage as an example, the present scheme provides a battery assembly 20, wherein a group of chemical batteries are arranged in the battery assembly 20, chemical elements in the chemical batteries are mainly used as energy storage media, and the charging and discharging process is accompanied with chemical reaction or change of the energy storage media, namely, the electric energy generated by wind energy and solar energy is simply stored in the chemical batteries, and the stored electric quantity is released for use when the use of external electric energy reaches a peak, or is transferred to a place with short electric quantity for reuse.

The present energy storage (i.e. energy storage) application scenario is relatively wide, including aspects such as (wind and light) power generation side energy storage, power grid 50 side energy storage, base station side energy storage, user side energy storage, etc., the types of the corresponding battery assembly 20 include:

(1) The large energy storage container applied to the energy storage scene at the side of the power grid 50 can be used as a high-quality active and reactive power regulation power supply in the power grid 50, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid 50 system, relieving peak load power supply pressure and peak regulation and frequency modulation.

(2) The small and medium energy storage electric cabinet is applied to industrial and commercial energy storage scenes (banks, markets and the like) at the user side, and the main operation mode is peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved.

Referring to fig. 1 and 2, fig. 1 is an application scenario diagram of an energy storage system provided by an embodiment of the present application, where a battery assembly 20 provided by the embodiment of the present application is applied to an energy storage system 1, the energy storage system 1 includes an electric energy conversion device 30 (photovoltaic panel), a wind energy conversion device 40 (fan), a power grid 50 and the battery assembly 20, and the battery assembly 20 can be used as an energy storage cabinet and can be installed outdoors. In particular, the photovoltaic panel may convert solar energy into electrical energy during periods of low electricity prices, and the battery assembly 20 is used to store the electrical energy and supply the electrical grid 50 during peak electricity use or to supply electricity during power outage/outage of the electrical grid 50. Wind energy conversion device 40 (wind turbine) may convert wind energy into electrical energy that battery assembly 20 may use to store and supply to grid 50 during peak power usage or to power grid 50 at power outage/outage. The transmission of the electric energy can be performed by adopting a high-voltage cable.

The battery assembly 20 includes a harness isolation board, a plurality of connection tabs 116 and a plurality of battery cells 10 according to claim 12, wherein the connection tabs and the battery cells 10 are disposed at intervals on two opposite sides of the harness isolation board, and the plurality of battery cells 10 are electrically connected through the plurality of connection tabs 116.

The number of the battery cells 10 may be several, and the several battery cells 10 are connected in series or parallel, and the several battery cells 10 are supported and electrically connected by a wire harness isolation board (not shown). In this embodiment, "a plurality of" means two or more. The battery cell 10 may also be provided with an energy storage box for accommodating the battery cell 10.

Referring to fig. 2, an embodiment of the present application provides a battery cell 10, which includes an electrode assembly (not shown), a case 13, and an end cap assembly 11, wherein the electrode assembly is disposed in the case 13, and the end cap assembly 11 is electrically connected to the electrode assembly. The end cap assembly 11 is provided to cover the opening of the housing 13 and to close the housing 13.

The battery assembly 20 generally includes a plurality of battery cells 10 therein, and the plurality of battery cells 10 are connected by an electrical connector such as aluminum bar. In order to prevent the post 114 from being in contact with air oxidation, ash falling and oil stains for a long time, which causes the follow-up welding with the tabs to be unstable, the upper end of the post 114 is adhered with an adhesive tape for isolation, so that the positive/negative electrode marks arranged at the position of the upper plastic 113 cannot be visually identified, and the top patch 112 at the side of the upper plastic 113 is provided with the positive/negative electrode marks.

Referring to fig. 2, 3, 4, 5 and 6, fig. 2 is a schematic structural view of a battery cell according to an embodiment of the present application, fig. 3 is a schematic structural view of an end cap assembly according to an embodiment of the present application, fig. 4 is an exploded structural view of the end cap assembly according to fig. 3, fig. 5 is a schematic structural view of a cross section of the end cap assembly according to A-A line provided in fig. 3, and fig. 6 is a schematic structural view of a portion of the end cap assembly according to an embodiment of the present application. The embodiment of the application also provides an end cover assembly 11, which comprises a top cover 111, a top patch 112, an upper plastic 113 and a pole 114. The top cover 111 has a first surface 1111 and a second surface 1112 disposed opposite to each other. The electrode post 114 includes a positive electrode post 1141 and a negative electrode post 1142, the positive electrode post 1141 is disposed through the top cover 111, the top of the positive electrode post 1141 exposes the first surface 1111, the negative electrode post 1142 is disposed through the top cover 111, and the top of the negative electrode post 1142 exposes the first surface 1111. The upper plastic 113 comprises an anode upper plastic 1134 and a cathode upper plastic 1135, the anode upper plastic 1134 surrounds the outer peripheral surface of the top of the anode post 1141, the bottom surface of the anode upper plastic 1134 is attached to the first surface 1111, a first anode mark 1131 is arranged on the top surface of the anode upper plastic 1134, the cathode upper plastic 1135 surrounds the outer peripheral surface of the top of the cathode post 1142, the bottom surface of the cathode upper plastic 1135 is attached to the first surface 1111, and a first cathode mark 1133 is arranged on the top surface of the cathode upper plastic 1135. The top patch 112 is attached to the first surface 1111, a second positive electrode identifier 1121 is disposed on the top patch 112 near the plastic 1134 on the positive electrode, and a second negative electrode identifier 1123 is disposed on the top patch 112 near the plastic 1135 on the negative electrode.

Alternatively, the end cap assembly 11 may be applied to a battery cell 10 such as a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, an energy storage battery, or the like. It should be understood that the battery cell 10 illustrated in the drawings is only one form of the battery cell 10, and should not be construed as limiting the battery cell 10 provided by the present application.

Optionally, the pole 114 is used in the end cap assembly 11 to transmit electrical signals. The pole 114 includes a positive pole 1141 and a negative pole 1142.

Optionally, the positive electrode post 1141 is disposed through the top cover 111, and the top of the positive electrode post 1141 exposes the first surface 1111. Note that the top of the positive electrode pillar 1141 is divided in a direction in which the second surface 1112 points toward the first surface 1111. In other words, the portion of the positive electrode pillar 1141 exposed and protruding from the top cover 111 is the top of the positive electrode pillar 1141.

Optionally, the negative electrode post 1142 is disposed through the top cover 111, and a top portion of the negative electrode post 1142 exposes the first surface 1111. Note that the top of the negative electrode pillar 1142 is divided in a direction in which the second surface 1112 points toward the first surface 1111. In other words, the portion of the negative electrode post 1142 exposed and protruding from the top cover 111 is the top of the negative electrode post 1142.

Optionally, the top patch 112 is provided with the second positive electrode identifier 1121 and the second negative electrode identifier 1123 on a surface facing away from the first surface 1111, where the second positive electrode identifier 1121 is used to identify the polarity of the positive electrode column 1141, and the second negative electrode identifier 1123 is used to identify the polarity of the negative electrode column 1142. Specifically, the second positive electrode identifier 1121 may be disposed near the plastic 1134 on the positive electrode, that is, near the positive electrode post 1141, the second negative electrode identifier 1123 may be disposed near the plastic 1135 on the negative electrode, that is, near the negative electrode post 1142, and the second positive electrode identifier 1121 and the second negative electrode identifier 1123 have different shapes according to different polarities of the positive electrode post 114, so as to facilitate the recognition of the polarity of the positive electrode post 114 by a machine or an operator.

Alternatively, the shape of the second positive electrode identifier 1121 may be "+" or approximately "+" when the polarity of the pole 114 is positive ("+"), and the shape of the second negative electrode identifier 1123 may be "-" or approximately "-" when the polarity of the pole 114 is negative ("-"). It should be noted that the shape of the second positive electrode identifier is "+", and it is understood that the shape of the orthographic projection of the second positive electrode identifier 1121 on the first surface 1111 is "+". The shape of the second negative electrode identifier 1123 is "-", and it is understood that the shape of the orthographic projection of the second negative electrode identifier 1123 on the first surface 1111 is "-".

Alternatively, the second positive electrode identifier 1121 and the second negative electrode identifier 1123 may be indentations formed on the surface of the top patch 112.

In one embodiment of the present application, when the second positive electrode label 1121 is an indentation, the shape of the second positive electrode label 1121 is "+", and it is understood that the second positive electrode label 1121 is formed by a plurality of indentation sides. The plurality of indentation sides are surrounded together to form a shape "+", and the shape of the second negative electrode identifier 1123 is "-", which can be understood that the second negative electrode identifier 1123 is formed by a plurality of indentation sides, and the plurality of indentation sides are surrounded together to form "-". In this embodiment, the second positive electrode identifier 1121 and the second negative electrode identifier 1123 may not only form a "+" shape identifier or a "-" shape identifier with a larger size, but also may prevent the second positive electrode identifier 1121 and the second negative electrode identifier 1123 from falling off during the long-term use of the top patch 112, compared with the "+" shape identifier or the "-" shape identifier forming the planar indentation, so that the recognition degree of the second positive electrode identifier 1121 and the second negative electrode identifier 1123 is improved, and the durability is also provided.

Optionally, the end cap assembly 11 includes two poles 114 with different polarities, specifically, one positive pole 1141 and one negative pole 1142.

Optionally, the end cap assembly 11 may further include a fill port 117 and an explosion proof valve 118. The liquid filling port 117 and the explosion-proof valve 118 may be disposed between the positive electrode pillar 1141 and the negative electrode pillar 1142.

Optionally, the plastic 1134 on the positive electrode is disposed around the outer peripheral surface of the top of the positive electrode post 1141, and the plastic 1134 on the positive electrode may be attached to the outer peripheral surface of the top of the positive electrode post 1141.

Optionally, the bottom surface of the plastic 1134 on the positive electrode is attached to the first surface 1111, and the plastic 1134 on the positive electrode may expose the first surface 1111.

Optionally, a first positive electrode identifier 1131 is disposed on the top surface of the plastic 1134 on the positive electrode. It should be noted that the top and bottom surfaces of the plastic 1134 on the positive electrode are divided in the direction that the second surface 1112 points to the first surface 1111. In other words, the surface of the plastic 1134 on the positive electrode exposed and protruding from the top cover 111 is a top surface of the plastic 1134 on the positive electrode, and the top surface and the first surface 1111 may be disposed opposite to each other.

Optionally, the plastic 1135 on the negative electrode surrounds the outer peripheral surface of the top of the negative electrode post 1142, and the plastic on the negative electrode may be attached to the outer peripheral surface of the top of the negative electrode post.

Optionally, the bottom surface of the plastic 1135 on the negative electrode is adhered to the first surface 1111, and the plastic 1135 on the negative electrode may expose the first surface 1111.

Optionally, a first anode identifier 1133 is disposed on the top surface of the plastic 1135 on the anode. It should be noted that the top and bottom surfaces of the plastic 1135 on the negative electrode are divided in the direction that the second surface 1112 points to the first surface 1111. In other words, the surface of the negative electrode plastic 1135 exposed and protruding from the top cover 111 is a top surface of the negative electrode plastic 1135, and the top surface and the first surface 1111 may be disposed opposite to each other.

Optionally, the first positive electrode identifier 1131 is used to identify the polarity of the positive electrode pillar 1141, and the first negative electrode identifier 1133 is used to identify the polarity of the negative electrode pillar 1142. Specifically, the pole 114 is disposed through the upper plastic 113, in other words, the upper plastic 113 is disposed around the pole 114, the first positive electrode identifier 1131 and the first negative electrode identifier 1133 may be disposed on a surface of the upper plastic 113 opposite to and opposite to the first surface 1111, and the surface of the first positive electrode identifier 1131 and the surface of the first negative electrode identifier 1133 may be connected with the upper plastic 113 by bending the surface of the pole 114. The first positive electrode tab 1131 and the first negative electrode tab 1133 may have different shapes according to the polarities of the poles 114, so as to facilitate the machine or the operator to identify the polarities of the poles 114.

Alternatively, when the polarity of the pole 114 is positive ("+"), the shape of the first positive electrode tab 1131 may be "+", or approximately "+", and when the polarity of the pole 114 is negative ("-"), the shape of the first negative electrode tab 1133 may be "-" or approximately "-". It should be noted that the shape of the first positive electrode tab 1131 is "+", and it is understood that the shape of the orthographic projection of the first positive electrode tab 1131 on the first surface 1111 is "+". The shape of the first negative electrode mark 1133 is "-", and it is understood that the shape of the orthographic projection of the first negative electrode mark 1133 on the first surface 1111 is "-".

Optionally, the first positive electrode identifier 1131 and the first negative electrode identifier 1133 may be grooves formed on a surface of the upper plastic 113 facing away from the top cover 111.

Optionally, the front projection of the first positive electrode identifier 1131 on the first surface 1111 and the front projection of the second positive electrode identifier 1121 on the first surface 1111 are offset from each other, in other words, the front projection of the first positive electrode identifier 1131 on the first surface 1111 and the front projection of the second positive electrode identifier 1121 on the first surface 1111 do not overlap each other.

Further alternatively, the first positive electrode identifiers 1131 and the second positive electrode identifiers 1121 are arranged at intervals along the circumferential direction of the pole 114. In other words, the line between the center point of the first positive electrode tab 1131 and the center point of the pole 114 is not on a straight line with the line between the center point of the second positive electrode tab 1121 and the center point of the pole 114.

Optionally, the front projection of the first negative electrode identifier 1133 on the first surface 1111 and the front projection of the second negative electrode identifier 1123 on the first surface 1111 are offset from each other, in other words, the front projection of the first negative electrode identifier 1133 on the first surface 1111 and the front projection of the second negative electrode identifier 1123 on the first surface 1111 do not overlap each other.

Further alternatively, the first negative electrode identifiers 1133 and the second negative electrode identifiers 1123 are arranged at intervals along the circumferential direction of the pole 114. In other words, the line between the center point of the first negative electrode tab 1133 and the center point of the pole 114 is not on a straight line with the line between the center point of the second negative electrode tab 1123 and the center point of the pole 114.

Optionally, the pole 114 is disposed through the top cover 111, the top patch 112 and the upper plastic 113, the top cover 111 is provided with a first through hole 1113, and the first through hole 1113 penetrates through the first surface 1111 and the second surface 1112. The top patch 112 is provided with a second through hole 1122, and the second through hole 1122 is at least partially opposite to the first through hole 1113. The upper plastic 113 is at least partially received in the first through hole 1113 and the second through hole 1122, and the upper plastic 113 is provided with a third through hole 1132, the third through hole 1132 is at least partially opposite to the first through hole 1113 and the second through hole 1122, and the pole 114 is disposed through the first through hole 1113, the second through hole 1122 and the third through hole 1132.

Further alternatively, the second positive electrode identifier 1121 and the second negative electrode identifier 1123 are disposed adjacent to the second through hole, so as to be disposed adjacent to the pole 114 and identify the polarity of the pole 114.

Further alternatively, the pole 114 is disposed through the third through hole of the upper plastic 113, in other words, the upper plastic 113 is disposed around at least a portion of the peripheral side surface of the pole 114.

Further alternatively, the pole 114 partially protrudes from the first surface 1111 along the arrangement direction of the top cover 111 and the top patch 112. The upper plastic 113 is partially received in the first through hole and the second through hole, and the other portion of the upper plastic 113 protrudes from the first surface 1111 along the arrangement direction of the top cover 111 and the top patch 112.

Optionally, the end cap assembly 11 further includes a connection tab 116, when the end cap assembly 11 is applied to a multi-core battery, in other words, when the end cap assembly 11 is applied to a battery assembly 20 including a plurality of battery cells 10, the pole 114 is electrically connected to the connection tab 116, and the connection tab 116 may be electrically connected to the pole 114 between different energy storage units, thereby enabling transmission of electrical signals between the plurality of energy storage units.

Alternatively, the connecting tab 116 may be disposed on a surface of the pole 114 protruding from and opposite to the first surface 1111, and at least partially covers a surface of the upper plastic 113 protruding from and opposite to the first surface 1111.

Optionally, at least one of the front projection of the connection tab 116 on the first surface 1111 and the front projection of the first positive electrode mark 1131 on the first surface 1111 and the front projection of the second positive electrode mark 1121 on the first surface 1111 are staggered with each other. At least one of the front projection of the connecting tab 116 on the first surface 1111 and the front projection of the first negative electrode mark 1133 on the first surface 1111 and the front projection of the second negative electrode mark 1123 on the first surface 1111 are staggered with each other. In other words, the front projection of the connection tab 116 on the first surface 1111 and at least one of the front projection of the first positive electrode tab 1131 on the first surface 1111 and the front projection of the second positive electrode tab 1121 on the first surface 1111 do not overlap each other. At least one of the front projection of the connecting tab 116 on the first surface 1111 and the front projection of the first negative electrode mark 1133 on the first surface 1111 and the front projection of the second negative electrode mark 1123 on the first surface 1111 are non-overlapping. In other words, when the front projection of the connection tab 116 on the first surface 1111 covers, or partially covers, the front projection of the first positive electrode tab 1131 on the first surface 1111, the front projections of the connection tab 116 on the first surface 1111 and the front projections of the second positive electrode tab 1121 on the first surface 1111 are staggered with each other, so as to facilitate the identification of the polarity of the positive electrode post 1141. When the front projection of the connection tab 116 on the first surface 1111 or the front projection of the first negative electrode mark 1133 on the first surface 1111 is partially covered, the front projections of the connection tab 116 on the first surface 1111 and the front projections of the second negative electrode mark 1123 on the first surface 1111 are staggered, so as to facilitate the identification of the polarity of the positive electrode post 1141.

Optionally, before the pole 114 is connected to the connection tab 116, in order to prevent the exposed surface of the pole 114 from being oxidized, ash and oil dirt from being dropped due to long-term contact with air, and causing a problem of weak welding with the connection tab 116, an adhesive tape (not shown) may be applied to the surface of the pole 114 facing away from the top cover 111 to isolate the surface, and the adhesive tape may cover, or partially cover, the first positive electrode label 1131 and the first negative electrode label 1133. It should be noted that the adhesive tape is applied only selectively before the pole 114 is not connected to the connection tab 116, and the adhesive tape is not retained in the end cap assembly 11 product, and it should be understood that the adhesive tape should not be construed as limiting the end cap assembly 11 provided in this embodiment.

Note that, the front projection of the upper plastic 113 on the top patch 112 and the second positive electrode identifier 1121 and the second negative electrode identifier 1123 are staggered, in other words, the front projection of the upper plastic 113 on the top patch 112 is not covered by the second positive electrode identifier 1121 and the second negative electrode identifier 1123. In other words, the second positive electrode identifier 1121 and the second negative electrode identifier 1123 are exposed on the top patch 112 and the upper plastic 113, so that a machine or an operator can intuitively identify the second positive electrode identifier 1121 and the second negative electrode identifier 1123.

Alternatively, the top cover 111 may be a light aluminum sheet.

In the end cover assembly 11 of the embodiment of the application, the second positive electrode identifier 1121 is arranged on the top patch 112 at a position close to the plastic 1134 on the positive electrode, the second negative electrode identifier 1123 is arranged on the top patch 112 at a position close to the plastic 1135 on the negative electrode, the second positive electrode identifier 1121 is used for identifying the polarity of the positive electrode column, the second negative electrode identifier 1123 is used for identifying the polarity of the negative electrode column, in order to prevent the problem that the surface exposed by the pole column 114 is in contact with air for a long time and is oxidized, ash and oil stains are caused to be in weak welding with the connecting tab 116, an adhesive tape (the adhesive tape is not reserved in the end cover assembly 11 product) is adhered on the surface of the pole column 114 facing away from the top cover 111 for isolation, the second positive electrode identifier 1121 and the second negative electrode identifier 1123 are arranged on the top patch 112, the first positive electrode identifier 1131 and the first negative electrode identifier 1133 are arranged on the upper plastic 113, the situation that the polarity of the pole 114 cannot be identified due to the fact that the first positive pole identifier 1131 and the second positive pole identifier 1121 are simultaneously covered by the adhesive tape can be avoided, the situation that the polarity of the pole 114 cannot be identified due to the fact that the first negative pole identifier 1133 and the second negative pole identifier 1123 are simultaneously covered by the adhesive tape can be avoided, and therefore a machine or an operator can intuitively identify the polarity of the pole 114, identification errors of the polarity of the pole 114 are avoided, identification speed is improved, production efficiency and product preparation yield are further improved greatly, risks and hidden dangers caused by the identification errors of the polarity of the pole 114 are avoided, and electrochemical safety performance of the battery cell 10 applied to the end cover assembly 11 and the end cover assembly 11 is guaranteed to a great extent.

Referring to fig. 7, fig. 7 is a schematic top view of an end cap assembly according to an embodiment of the application. The second positive electrode marker 1121 has a maximum width D of the front projection on the first surface 1111 ₁ The front projection of the first positive electrode mark 1131 on the first surface 1111 has a maximum width D ₂ The maximum width D ₁ And the maximum width D ₂ The method meets the following conditions: d is more than or equal to 1.5 ₁ /D ₂ Less than or equal to 1.8. The second negative electrode mark 1123 has a maximum width D in front projection on the first surface 1111 ₃ The front projection of the first negative electrode mark 1133 on the first surface 1111 has a maximum width D ₄ The maximum width D ₃ And the maximum width D ₄ The method meets the following conditions: d is more than or equal to 1.5 ₃ /D ₄ ≤1.8。

Optionally, the second positive electrode identifier 1121 has a maximum width D in front projection on the first surface 1111 ₁ It is understood that the maximum width D ₁ The distance value between the two maximum spacing points of the orthographic projection of the second positive electrode marker 1121 on the first surface 1111 is shown.

Optionally, aThe front projection of the first positive electrode mark 1131 on the first surface 1111 has a maximum width D ₂ It is understood that the maximum width D ₂ The distance value between the two maximum points of the distance of the front projection of the first positive pole sign 1131 on the first surface 1111 is set.

Optionally, the maximum width D of the second positive electrode identifier 1121 ₁ Greater than the maximum width D of the first positive electrode tab 1131 ₂ Because the upper plastic 113 is arranged around the pole 114, when the pole 114 is adhered with the adhesive tape for isolation, the first positive electrode mark 1131 arranged on the surface of the upper plastic 113 can be easily shielded, at this time, a machine or an operator can distinguish the polarity of the pole 114 through the second positive electrode mark 1121, and the second positive electrode mark 1121 has the maximum width D ₁ Is provided to facilitate visual identification of the polarity of the pole 114, and the second positive electrode tab 1121 can be designed to have a larger maximum width D because the surface of the top patch 112 opposite the top cover 111 is generally larger than the surface of the upper plastic 113 opposite the top cover 111 ₁ Thereby improving the identification of the second positive electrode tab 1121.

Optionally, the maximum width D ₁ And the maximum width D ₂ Has a ratio D between ₁ /D ₂ Said ratio D ₁ /D ₂ The method meets the following conditions: d is more than or equal to 1.5 ₁ /D ₂ Less than or equal to 1.8, in particular, the maximum width D ₁ And the maximum width D ₂ Ratio D between ₁ /D ₂ May be, but is not limited to, 1.5, or 1.55, or 1.6, or 1.65, or 1.7, or 1.75, or 1.8, etc. The maximum width D ₁ And the maximum width D ₂ If the ratio is too small, the second positive electrode marker 1121 cannot be visually recognized when the first positive electrode marker 1131 is blocked, and the maximum width D ₁ And the maximum width D ₂ The ratio of the two is too large, and more area is required on the top patch 112 to set the second positive electrode identifier 1121, which is detrimental to the adhesion of the top patch 112 to the top cover 111。

Optionally, the second negative electrode identifier 1123 has a maximum width D in front projection on the first surface 1111 ₃ It is understood that the maximum width D ₃ The distance value between the two points of maximum spacing of the orthographic projection of the second negative electrode marker 1123 on the first surface 1111 is identified.

Optionally, the maximum width of the orthographic projection of the first negative electrode identifier 1133 on the first surface 1111 is D ₄ It is understood that the maximum width D ₄ The distance value between the two points of maximum spacing of the front projection of the first negative electrode 1133 on the first surface 1111 is identified.

Optionally, the maximum width D of the second negative electrode identifier 1123 ₃ Greater than the maximum width D of the first negative electrode tab 1133 ₄ Because the upper plastic 113 is arranged around the pole 114, when the pole 114 is adhered with the adhesive tape for isolation, the first negative electrode identifier 1133 arranged on the surface of the upper plastic 113 can be easily shielded, at this time, a machine or an operator can distinguish the polarity of the pole 114 through the second negative electrode identifier 1123, and the second negative electrode identifier 1123 has the maximum width D ₁ Is provided to facilitate visual identification of the polarity of the pole 114, and the second negative indicia 1123 may be designed to be larger than the maximum width D, since the surface of the top patch 112 opposite the top cover 111 is generally larger than the surface of the upper plastic 113 opposite the top cover 111 ₁ Thereby improving the identification of the second negative electrode tab 1123.

Optionally, the maximum width D ₃ And the maximum width D ₄ Has a ratio D between ₃ /D ₄ Said ratio D ₃ /D ₄ The method meets the following conditions: d is more than or equal to 1.5 ₃ /D ₄ Less than or equal to 1.8, in particular, the maximum width D ₃ And the maximum width D ₄ Ratio D between ₃ /D ₄ May be, but is not limited to, 1.5, or 1.55, or 1.6, or 1.65, or 1.7, or 1.75, or 1.8, etc. The maximum width D ₃ And the maximum width D ₄ If the ratio is too small, the second negative electrode mark 1123 cannot be visually recognized when the first negative electrode mark 1133 is blocked, and the maximum width D ₃ And the maximum width D ₄ The ratio between the two is too large, and more area is required on the top patch 112 to set the second negative electrode identifier 1123, and the adhesion of the top patch 112 to the top cover 111 is not facilitated.

Referring to fig. 8, fig. 8 is a schematic top view of an end cap assembly according to a second embodiment of the application. The perpendicular line from the center point of the first positive electrode identifier 1131 to the central axis of the positive electrode post 1141 is a first connecting line 113a, and the perpendicular line from the center point of the second positive electrode identifier 1121 to the central axis of the positive electrode post 1141 is a second connecting line 112a, where an included angle between the second connecting line 112a and the first connecting line 113a is 80 ° to 90 °. The perpendicular line from the center point of the first negative electrode identifier 1133 to the central axis of the negative electrode column 1142 is a third connecting line 113b, and the perpendicular line from the center point of the second negative electrode identifier 1123 to the central axis of the negative electrode column 1142 is a fourth connecting line 112b, where an included angle between the third connecting line 113b and the fourth connecting line 112b is 80 ° -90 °.

Optionally, a perpendicular from a center point of the first positive electrode identifier 1131 to a central axis of the positive electrode post 1141 is a first connection line 113a, and it is understood that the center point of the first positive electrode identifier 1131 is a center point of a cross section of the first positive electrode identifier 1131 on a surface of the top patch 112 facing away from the top cover 111, the central axis of the positive electrode post 1141 is perpendicular to the first surface, and a perpendicular from the center point of the first positive electrode identifier 1131 to the central axis of the positive electrode post 1141 is the first connection line 113a.

Optionally, a perpendicular line from the center point of the second positive electrode identifier 1121 to the central axis of the positive electrode post 1141 is a second connecting line 112a, and it is understood that the center point of the second positive electrode identifier 1121 is a center point of a cross section of the second positive electrode identifier 1121 on the surface of the top patch 112 facing away from the top cover 111.

Optionally, a perpendicular from the center point of the first negative electrode identifier 1133 to the central axis of the negative electrode post 1142 is the third connecting line 113b, it is understood that the center point of the first negative electrode identifier 1133 is the center point of the cross section of the first negative electrode identifier 1133 on the surface of the top patch 112 facing away from the top cover 111, the central axis of the negative electrode post 1142 is perpendicular to the first surface, and a perpendicular from the center point of the first negative electrode identifier 1133 to the central axis of the negative electrode post 1142 is the first connecting line 113a.

Optionally, a perpendicular from the center point of the second negative electrode identifier 1123 to the central axis of the negative electrode post 1142 is a fourth connecting line 112b, which is understood that the center point of the second negative electrode identifier 1123 is the center point of the cross section of the second negative electrode identifier 1123 on the surface of the top patch 112 facing away from the top cover 111.

Optionally, an included angle between the second connecting line and the first connecting line is a, and the included angle a is 80 °, or 81 °, or 82 °, or 83 °, or 84 °, or 85 °, or 86 °, or 87 °, or 88 °, or 89 °, or 90 °, or the like. When the included angle a between the second connection line and the first connection line is too small, the misalignment between the first positive electrode identifier 1131 and the second positive electrode identifier 1121 is smaller, and the first positive electrode identifier 1131 and the second positive electrode identifier 1121 are easily covered at the same time, so that the polarity of the pole 114 is difficult to distinguish. When the included angle a between the second connection line and the first connection line is too large, the cross section of the pole 114 protruding out of the top cover 111 is circular, and the dislocation between the first positive electrode identifier 1131 and the second positive electrode identifier 1121 is still smaller, so that the first positive electrode identifier 1131 and the second positive electrode identifier 1121 are easily covered at the same time, and the polarity of the pole 114 is difficult to distinguish.

Optionally, an included angle between the fourth connecting line 112b and the third connecting line 113b is b, where the included angle b is 80 °, or 81 °, or 82 °, or 83 °, or 84 °, or 85 °, or 86 °, or 87 °, or 88 °, or 89 °, or 90 °, or the like. When the included angle b between the fourth connection line 112b and the third connection line 113b is too small, the misalignment between the first negative electrode identifier 1133 and the second negative electrode identifier 1123 is small, and the first negative electrode identifier 1133 and the second negative electrode identifier 1123 are easily covered at the same time, so that the polarity of the polar column 114 is difficult to distinguish. When the included angle b between the fourth connecting line 112b and the third connecting line 113b is too large, the cross section of the pole 114 protruding out of the top cover 111 is circular, the dislocation between the first negative electrode identifier 1133 and the second negative electrode identifier 1123 is still smaller, so that the first negative electrode identifier 1133 and the second negative electrode identifier 1123 are easily covered at the same time, and the polarity of the pole 114 is difficult to distinguish.

In a preferred embodiment, the included angle a between the second wire and the first wire is 90 °, the included angle b between the fourth wire and the third wire is 90 °, the first positive electrode identifier 1131 and the second positive electrode identifier 1121 are staggered by 90 °, and the first negative electrode identifier 1133 and the second negative electrode identifier 1123 are staggered by 90 °, so that when the connection tab 116 is electrically connected to the connection tab 116, the connection tab 116 extends along the direction of the first wire or extends along the direction perpendicular to the first wire, the end cap assembly 11 can ensure that at least one of the first positive electrode identifier 1131 and the second positive electrode identifier 1121 can be exposed in at least one direction, and at least one of the first negative electrode identifier 1133 and the second negative electrode identifier 1123 can be exposed, so that the connection tab 114 is convenient for identifying the polarity after the connection tab 114 is electrically connected to the connection tab 116.

Referring to fig. 9, fig. 9 is a schematic top view of an end cap assembly according to a third embodiment of the application. The top surface of the plastic 1134 on the positive electrode is provided with two first positive electrode identifiers 1131, and the connecting line of the two first positive electrode identifiers 1131 is intersected with the central axis of the positive electrode post 1141. The top surface of the plastic 1135 on the negative electrode is provided with two first negative electrode identifiers 1133, and the connecting line of the two first negative electrode identifiers 1133 is intersected with the central axis of the negative electrode column 1142.

Alternatively, the connection between the two first positive electrode identifiers 1131 may be understood as a connection between the center point of one of the first positive electrode identifiers 1131 and the center point of the other first positive electrode identifier 1131.

Optionally, the central axis of the positive post 1141 is perpendicular to the first surface 1111.

The connection line of the two first positive electrode identifiers 1131 intersects with the central axis of the positive electrode post 1141, that is, the connection line of the two first positive electrode identifiers 1131 is perpendicular to the central axis of the positive electrode post 1141. In other words, the two first positive electrode identifiers 1131 are symmetrically disposed about the central axis of the positive electrode post 1141, so that the first positive electrode identifier 1131 can be intuitively identified from multiple angles, and further, the polarity of the positive electrode post 1141 can be intuitively identified, and when one of the two first positive electrode identifiers 1131 is covered or worn, the polarity of the positive electrode post 1141 can be also identified by the other one of the two first positive electrode identifiers 1131.

Alternatively, the connection between the two first anode identifiers 1133 may be understood as a connection between the center point of one of the first anode identifiers 1133 and the center point of the other first anode identifier 1133.

Optionally, the central axis of the cathode post 1142 is perpendicular to the first surface 1111.

The connection line of the two first anode identifiers 1133 intersects with the central axis of the positive electrode post 1141, that is, the connection line of the two first anode identifiers 1133 is perpendicular to the central axis of the negative electrode post 1142. In other words, the two first negative electrode identifiers 1133 are symmetrically disposed about the central axis of the negative electrode post 1142, so that the first negative electrode identifier 1133 can be intuitively identified from multiple angles, and further, the polarity of the negative electrode post 1142 can be intuitively identified, and when one of the two first negative electrode identifiers 1133 is covered or worn, the polarity of the negative electrode post 1142 can be also identified by the other of the two first negative electrode identifiers 1133.

Referring to fig. 10, 11, 12 and 13, fig. 10 is a schematic structural view of the plastic on the positive electrode provided in the embodiment of the present application, fig. 11 is a schematic structural view of the plastic on the positive electrode provided in fig. 10 in a section along line B-B, fig. 12 is a schematic structural view of the plastic on the negative electrode provided in the embodiment of the present application, and fig. 13 is a schematic structural view of the plastic on the negative electrode provided in fig. 12 in a section along line C-C. The plastic 1134 on the positive electrode has a thickness range D ₅ The first positive electrode mark 1131 is a groove, the groove is recessed on the surface of the plastic 1134 along the direction of the plastic 1134 on the positive electrode pointing to the top cover 111, and the first positive electrode mark 1131 has a dimension range D in the thickness direction of the plastic 1134 on the positive electrode ₆ The size range D ₆ And the thickness range D ₅ The ratio of (2) is as follows: d is more than or equal to 0.08 ₆ /D ₅ Less than or equal to 0.1. And/or the plastic 1135 on the cathode has a thickness range D ₇ The first negative electrode identifier 1133 is a groove, the groove is recessed on the surface of the negative electrode upper plastic 1135 along the direction that the negative electrode upper plastic 1135 points to the top cover 111, and the first negative electrode identifier 1133 has a dimension range D in the thickness direction of the negative electrode upper plastic 1135 ₈ The thickness range D ₇ And the size range D ₈ The ratio of (2) is as follows: d is more than or equal to 0.08 ₈ /D ₇ ≤0.1。

Optionally, the thickness range D ₅ It is understood that the distance range between two points at which the distance of the plastic 1134 in the thickness direction is the largest on the positive electrode is the value.

Optionally, the thickness range D ₇ It is understood that the distance range between two points at which the distance of the plastic 1135 in the thickness direction is the largest on the negative electrode is the value.

Optionally, the first positive electrode identifier 1131 is a groove, and the groove is recessed in the surface of the plastic 1134 on the positive electrode along the direction of the plastic 1134 on the positive electrode pointing to the top cover 111, which can be understood as that the groove is formed on the surface of the plastic 1134 on the positive electrode opposite to and deviating from the top cover 111.

Optionally, the first negative electrode identifier 1133 is a groove, and the groove is recessed in the surface of the negative electrode upper plastic 1135 along the direction of the negative electrode upper plastic 1135 pointing to the top cover 111, which can be understood that the groove is formed on the surface of the negative electrode upper plastic 1135 opposite to and facing away from the top cover 111.

Optionally, the first positive electrode mark 1131 has a thickness direction of the plastic 1134 on the positive electrodeSize range D ₆ The size range D ₆ The distance range value between two points with the largest distance between the first positive electrode mark 1131 and the plastic 1134 in the thickness direction of the positive electrode can be obtained.

Optionally, the first negative electrode label 1133 has a dimension range D in the thickness direction of the plastic 1135 on the negative electrode ₈ The size range D ₈ The first negative electrode mark 1133 may have a distance range value between two points with the greatest distance in the thickness direction of the plastic 1135 on the negative electrode.

Optionally, the size range D ₆ And the thickness range D ₅ Ratio D of (2) ₆ /D ₅ May be, but is not limited to, 0.08, or 0.085, or 0.088, or 0.09, or 0.092, or 0.095, or 0.098, or 0.1, etc.

Optionally, the size range D ₈ And the thickness range D ₇ Ratio D of (2) ₈ /D ₇ May be, but is not limited to, 0.08, or 0.085, or 0.088, or 0.09, or 0.092, or 0.095, or 0.098, or 0.1, etc.

The size range D of the first positive electrode tab 1131 ₆ And the thickness range D of the plastic 1134 on the positive electrode ₅ When the ratio of the first positive electrode mark 1131 is too large, the structural stability of the plastic 1134 on the positive electrode is affected, so that the plastic 1134 on the positive electrode is easy to deform, break or the like in the long-time use process, and the size range D of the first positive electrode mark 1131 ₆ And the thickness range D of the plastic 1134 on the positive electrode ₅ If the ratio of (c) is too small, the first positive electrode tab 1131 is not easily observed or recognized, and the first positive electrode tab 1131 is easily worn out and obscured during long-term use of the end cap assembly 11. Similarly, the size range D of the first negative electrode tab 1133 ₈ And the thickness range D of the plastic 1134 on the positive electrode ₇ When the ratio of the first anode mark 1133 is too large, the structural stability of the plastic 1135 on the anode is affected, so that the plastic 1134 on the anode is easy to deform, break or the like in the long-time use process, and the size range D of the first anode mark 1133 ₈ And the thickness range D of the plastic 1135 on the negative electrode ₇ If the ratio of (c) is too small, the first negative indicia 1133 may not be easily observed or identified, and the first negative indicia 1133 may be easily worn out and obscured during prolonged use of the end cap assembly 11. The size range D of the first positive electrode tab 1131 ₆ And the thickness range D of the plastic 1134 on the positive electrode ₅ The ratio of (2) is as follows: d is more than or equal to 0.08 ₆ /D ₅ Less than or equal to 0.1, the size range D of the first negative electrode identification 1133 ₈ And the thickness range D of the plastic 1135 on the negative electrode ₇ The ratio of (2) is as follows: d is more than or equal to 0.08 ₈ /D ₇ And less than or equal to 0.1, the structural stability of the plastic 1134 on the positive electrode and the plastic 1135 on the negative electrode can be kept, and meanwhile, the first positive electrode mark 1131 and the first negative electrode mark 1133 cannot be blurred due to abrasion, so that the polarity of the pole 114 can be visually identified in the long-term use process of the end cover assembly 11.

Referring to fig. 14, fig. 14 is a schematic top view of an end cap assembly according to a fourth embodiment of the application. The second positive electrode marker 1121 has a nearest distance L from the plastic 1134 on the positive electrode to the periphery of the second positive electrode marker 1121 ₁ The nearest distance range L ₁ The method meets the following conditions: l is less than or equal to 2mm ₁ Less than or equal to 8mm. And/or, the second negative electrode identifier 1123 has a nearest distance range L between the negative electrode plastic 1135 and the periphery of the negative electrode plastic 1133 adjacent to the second negative electrode identifier 1123 ₂ The nearest distance range L ₂ The method meets the following conditions: l is less than or equal to 2mm ₂ ≤8mm。

Optionally, the on-anode plastic 1134 is adjacent to the periphery of the second anode identifier 1121, and it is understood that the on-anode plastic 1134 is located closest to the second anode identifier 1121 in a cross section, and the cross section is parallel to the first surface 1111 and in the same plane as the second anode identifier 1121.

Optionally, the nearest distance range L ₁ It will be appreciated that the second positive electrode tab 1121 and the plastic 1134 on the positive electrode are adjacent to the periphery of the second positive electrode tab 1121The value between the closest two points.

Optionally, the on-anode plastic 1135 is adjacent to the periphery of the second anode identifier 1123, and it is understood that the on-anode plastic 1135 is located closest to the second anode identifier 1123 in a cross-section, which is parallel to the first surface 1111 and in the same plane as the second anode identifier 1123.

Optionally, the nearest distance range L ₂ It will be appreciated that the distance between the second negative electrode identifier 1123 and the periphery of the negative electrode upper plastic 1135 adjacent to the second negative electrode identifier 1123 is the closest value.

Optionally, the distance range L ₁ May be, but is not limited to, 2 mm, or 3mm, or 4 mm, or 5 mm, or 6 mm, or 7 mm, or 8 mm, or other numerical ranges, etc.

Optionally, the distance range L ₂ May be, but is not limited to, 2 mm, or 3mm, or 4 mm, or 5 mm, or 6 mm, or 7 mm, or 8 mm, or other numerical ranges, etc.

When the distance is within the range L ₁ When the distance between the second positive electrode identifier 1121 and the plastic 1134 on the positive electrode is too large, the distance between the second positive electrode identifier 1121 and the positive electrode post 1141 is too large, so that the second positive electrode identifier 1121 is easily misunderstood and is not used for marking the polarity of the positive electrode post 114, and the polarity of the positive electrode post 1141 is not easily and intuitively identified. When the distance is within the range L ₁ Too small, too close a distance between the second positive electrode identifier 1121 and the plastic 1134 on the positive electrode may also make a distance between the second positive electrode identifier 1121 and the positive electrode post 1141 too close, so that when the positive electrode post 1141 is attached with an adhesive tape or connected with the connection tab 116, the second positive electrode identifier 1121 is covered together, and thus, the polarity of the positive electrode post 1141 is not easy to be visually identified.

Similarly, when the distance is within the range L ₂ When the distance between the second negative electrode identifier 1123 and the plastic 1134 on the positive electrode is too large, the distance between the second negative electrode identifier 1123 and the negative electrode post 1142 is too large, so thatThe second negative electrode identifier 1123 is easily misunderstood and is not a label for the polarity of the negative electrode pillar 1142, and the polarity of the negative electrode pillar 1142 is not easily visually recognized. When the distance is within the range L ₁ Too small, the second negative electrode identifier 1123 is too close to the plastic 1135 on the negative electrode, which also makes the second negative electrode identifier 1123 too close to the negative electrode post 1142, so that the negative electrode post 1142 is covered together with the second negative electrode identifier 1123 when the adhesive tape is applied or the connection tab 116 is connected, and thus the polarity of the negative electrode post 1142 is not easy to be visually identified.

Referring to fig. 15, fig. 15 is a schematic top view of an end cap assembly according to a fifth embodiment of the present application. The upper plastic 113 further has an injection molding point 1136 and a thimble position 1137, the injection molding point 1136 is disposed on a surface of the upper plastic 113 facing away from the top cover 111, a perpendicular line from a center point of the injection molding point 1136 to a central axis of the pole 114 is a fifth connecting line 113c, and a perpendicular line from a center point of the first positive electrode identifier 1131 or the first negative electrode identifier 1133 to the central axis of the pole 114 is a sixth connecting line 113d, wherein an included angle between the fifth connecting line 113c and the sixth connecting line 113d is 80-90 °. The thimble position 1137 is disposed on the surface of the upper plastic 113 facing away from the top cover 111, a perpendicular line from a center point of the thimble position 1137 to a central axis of the pole 114 is a seventh connecting line 113e, where an included angle between the seventh connecting line 113e and the sixth connecting line 113d is 80 ° to 90 °, and the thimble position 1137 and the injection molding point 1136 are disposed on opposite sides of the central axis of the pole 114.

Optionally, the injection molding point 1136 is disposed on a surface of the upper plastic 113 facing away from the top cover 111, and the injection molding point 1136 and the first positive electrode identifier 1131 or the first negative electrode identifier 1133 are located on the same surface of the upper plastic 113.

Alternatively, the center point of the injection molding point 1136 may be understood as the center point of the cross section of the injection molding point 1136 in a direction perpendicular to the arrangement direction of the upper plastic 113 and the top cover 111.

Alternatively, the center point of the thimble seat 1137 may be understood as the center point of the cross section of the thimble seat 1137 along the direction perpendicular to the arrangement direction of the upper plastic 113 and the top cover 111.

Optionally, the center point of the first positive electrode tab 1131 may be understood as the center point of the cross section of the first positive electrode tab 1131 along the direction perpendicular to the arrangement direction of the upper plastic 113 and the top cover 111.

Optionally, the center point of the first negative electrode tab 1133 may be understood as the center point of the cross section of the first negative electrode tab 1133 along the direction perpendicular to the arrangement direction of the upper plastic 113 and the top cover 111.

Optionally, the ejector pin 1137 and the injection molding point 1136 are disposed opposite to each other on opposite sides of the central axis of the pole 114, in other words, the ejector pin 1137 and the injection molding point 1136 are symmetrically disposed with the pole 114 as a central axis.

Optionally, the included angle between the fifth connecting line 113c and the sixth connecting line 113d may be, but not limited to, 80 °, or 81 °, or 82 °, or 83 °, or 84 °, or 85 °, or 86 °, or 87 °, or 88 °, or 89 °, or 90 °, or other angles, etc. When the angle between the fifth connecting line 113c and the sixth connecting line 113d is too large or too small, the first positive electrode mark 1131 or the first negative electrode mark 1133 is far or near the injection molding point 1136, so that the overall shrinkage force of the upper plastic 113 is uneven, and the upper plastic 113 is easy to warp and deform in the molding process.

Optionally, the included angle between the seventh connecting line 113e and the sixth connecting line 113d may be, but not limited to, 80 °, or 81 °, or 82 °, or 83 °, or 84 °, or 85 °, or 86 °, or 87 °, or 88 °, or 89 °, or 90 °, or other angles, etc. When the angle between the seventh connecting line 113e and the sixth connecting line 113d is too large or too small, the first positive electrode identifier 1131 or the first negative electrode identifier 1133 is far or near to the thimble position 1137, so that the overall stress of the upper plastic 113 is uneven, and the upper plastic 113 is easy to deform or break in the demolding process.

Please refer to fig. 7 again. The second positive electrode identifier 1121 is an indentation, and the indentation is disposed on a surface of the top patch 112 facing away from the top cover 111. And/or, the second negative electrode identifier 1123 is an indentation, and the indentation is disposed on the surface of the top patch 112 facing away from the top cover 111.

Optionally, the second positive electrode identifier 1121 is an indentation formed on the surface of the top patch 112. And the second positive electrode tab 1121 is recessed from the surface of the top patch 112 facing away from the top cover 111.

Optionally, the shape of the second positive electrode identifier 1121 is "+", in other words, the second positive electrode identifier 1121 is recessed on the surface of the top patch 112, so that the surface of the top patch 112 can intuitively recognize the indentation with the shape of "+", thereby intuitively recognizing the polarity of the positive electrode post 1141. It should also be noted that, the shape of the second positive electrode identifier 1121 is "+", it is understood that the second positive electrode identifier 1121 is formed by a plurality of indentation edges, that is, the plurality of indentation edges of the second positive electrode identifier 1121 are recessed on the surface of the top patch 112 along the thickness direction of the top patch 112, and the surface of the top patch 112 can be visually identified as an indentation surrounding the "+".

Optionally, the shape of the second negative electrode identifier 1123 is "-", in other words, the second negative electrode identifier 1123 is recessed on the surface of the top patch 112, so that the surface of the top patch 112 can visually identify the indentation with the shape "-", thereby visually identifying the polarity of the negative electrode column 1142. It should also be noted that, the shape of the second negative electrode identifier 1123 is "-", it is understood that the second negative electrode identifier 1123 is formed by a plurality of indentation edges, that is, the plurality of indentation edges of the second negative electrode identifier 1123 are recessed on the surface of the top patch 112 along the thickness direction of the top patch 112, and the surface of the top patch 112 can be visually identified as an indentation surrounding the "-".

In the embodiment of the present application, the plurality of indentation sides are enclosed together to form a shape "+" or a shape "-", so that the second positive electrode identifier 1121 and the second negative electrode identifier 1123 not only can form a "+" shape identifier or a "-" shape identifier with larger dimensions, but also can prevent the second positive electrode identifier 1121 and the second negative electrode identifier 1123 from falling off during the long-term use of the top patch 112 compared with the "+" identifier or the "-" identifier of the planar indentation formed by the planar indentation, so that the recognition degree of the second positive electrode identifier 1121 and the second negative electrode identifier 1123 is improved, and meanwhile, the top patch has durability.

Referring to fig. 16, fig. 16 is a schematic bottom view of a top patch according to a sixth embodiment of the present application. The second positive electrode tab 1121 penetrates the top sheet 112 in the thickness direction of the top sheet 112. And/or, the second negative electrode identifier 1123 penetrates the top patch 112 along the thickness direction of the top patch 112.

Optionally, the second positive electrode identifier 1121 penetrates through the top patch 112 along the thickness direction of the top patch 112, which may be understood that the second positive electrode identifier 1121 is an identifier formed after the top patch 112 is hollowed out.

Optionally, the second negative electrode identifier 1123 penetrates through the top patch 112 along the thickness direction of the top patch 112, which may be understood that the second negative electrode identifier 1123 is an identifier formed after the top patch 112 is hollowed out.

Alternatively, the shape of the second positive electrode identifier 1121 may be "+" or approximately "+", and the shape of the second negative electrode identifier 1123 may be "-" or approximately "-". It should be noted that the shape of the second positive electrode identifier 1121 is "+", and it is understood that the shape of the orthographic projection of the second positive electrode identifier 1121 on the first surface 1111 is "+". The shape of the second negative electrode identifier 1123 is "-", and it is understood that the shape of the orthographic projection of the second negative electrode identifier 1123 on the first surface 1111 is "-".

In the embodiment of the present application, the second positive electrode identifier 1121 and the second negative electrode identifier 1123 are hollow portions formed through the thickness of the top patch 112, which can avoid the situation that the abrasion is easy to occur to the indentation on the top patch 112 and the distinction is difficult to be made in the long-term use process of the end cover assembly 11, and the structural feature of the present application can also enable a machine or an operator to easily distinguish the polarity of the polar column 114 when the top patch 112 expands with heat and contracts with cold, so as to improve the distinction of the second positive electrode identifier 1121 and the second negative electrode identifier 1123.

Alternatively, the first color of the top patch 112 may be, but is not limited to being, black or near black.

Alternatively, the second color of the top cover 111 may be, but is not limited to, silver or approximately silver, and the second color is different from the first color.

Optionally, the top cover 111 is partially exposed through the second positive electrode identifier 1121 and the second negative electrode identifier 1123. In a specific embodiment of the present application, the first color of the top patch 112 is black, the second color of the top cover 111 is silver, and when the second positive electrode identifier 1121 and the second negative electrode identifier 1123 are hollowed-out parts formed through the thickness of the top patch 112, the top cover 111 is exposed through the second positive electrode identifier 1121 and the second negative electrode identifier 1123, so that a machine or an operator can conveniently identify the silver exposed by the second positive electrode identifier 1121 and the second negative electrode identifier 1123, thereby more conveniently identifying the polarity of the pole 114 through the second positive electrode identifier 1121 and the second negative electrode identifier 1123, and greatly improving the identification degree of the second positive electrode identifier 1121 and the second negative electrode identifier 1123.

Please refer to fig. 16 again. The top patch 112 has a first color, the end cap assembly 11 further includes an identification sheet 115, the identification sheet 115 is disposed on a side of the second positive electrode identification 1121 and the second negative electrode identification 1123 adjacent to the top cap 111, and the first identification sheet 115 has a third color, which is different from the first color.

The third color may be, but is not limited to being, red, or orange, or green, or cyan, or blue, or violet, etc., and the third color is different from the first color.

Optionally, the label sheet 115 is attached to the surface of the second positive electrode label 1121 and the second negative electrode label 1123 adjacent to the top cover 111.

Optionally, the front projection of the label 115 on the first surface 1111 covers the front projection of the second positive electrode label 1121 and the second negative electrode label 1123 on the first surface 1111 of the top patch 112.

Optionally, the label 115 is a fluorescent plastic sheet, so that the color of the label 115 exposed by the second positive electrode label 1121 and the second negative electrode label 1123 is more striking and easy to identify.

In the end cover assembly 11 provided in this embodiment, the identification piece 115 is disposed on a side, adjacent to the top cover 111, of the second positive electrode identification 1121 and the second negative electrode identification 1123, and when the second positive electrode identification 1121 and the second negative electrode identification 1123 are hollowed out portions formed by penetrating through the thickness of the top patch 112, the identification piece 115 is exposed through the second positive electrode identification 1121 and the second negative electrode identification 1123, so that a machine or an operator can conveniently identify a third color exposed by the identification piece 115, so that the polarity of the pole 114 is more conveniently identified through the second positive electrode identification 1121 and the second negative electrode identification 1123, and the identification degree of the second positive electrode identification 1121 and the second negative electrode identification 1123 is greatly improved. And the identification piece 115 can avoid the top cover 111 from exposing from the second positive electrode identification 1121 and the second negative electrode identification 1123, so that not only can the top cover 111 be dustproof and insulated, but also the interference of reflection of light on the surface of the top cover 111 can be avoided in the machine identification process, thereby further accelerating the identification of the second positive electrode identification 1121 and the second negative electrode identification 1123 by a machine or an operator, and further distinguishing the polarity of the pole 114 more quickly.

Referring to fig. 17, 18 and 19, fig. 17 is a schematic top view of an end cap assembly according to a sixth embodiment of the present application, fig. 18 is a schematic structural view of a second positive electrode label according to the sixth embodiment of the present application, and fig. 19 is a schematic structural view of a second negative electrode label according to the sixth embodiment of the present application. The second positive electrode identifier 1121 has a plurality of edges connected by bending, and at least two adjacent edges of the plurality of edges are connected by an arc angle. And/or, the second negative electrode identifier 1123 has a plurality of edges connected by bending, and at least two adjacent edges of the plurality of edges are connected by an arc angle.

Optionally, in a specific embodiment of the present application, the second positive electrode identifier 1121 has twelve sides that are connected by bending, where the twelve sides are sequentially connected by bending and surrounding to form a hollowed-out portion similar to "+", and each two adjacent sides are connected by an arc angle.

Optionally, in another specific embodiment of the present application, the second negative electrode identifier 1123 has four sides that are connected by bending, the four sides are connected by bending sequentially and surrounding a hollowed-out portion that is similar to "-", and each two adjacent sides are connected by an arc angle.

In this embodiment, when the second positive electrode identifier 1121 and the second negative electrode identifier 1123 are hollow portions formed along the thickness of the top patch 112, the corners of the second positive electrode identifier 1121 and the second negative electrode identifier 1123 formed by hollowing out the top patch 112 may be easily warped and peeled, and in order to prevent the warped and peeled top patch 112, preferably, arc angles are disposed at the outer edges of the second positive electrode identifier 1121 and the second negative electrode identifier 1123, that is, the edges of the second positive electrode identifier 1121 and the second negative electrode identifier 1123, which are connected by bending, are connected by the arc angles, so that the warpage and peeling of the top patch 112 are effectively prevented due to the stress relationship between the two adjacent edges, thereby ensuring the normal operation and good performance of the top patch 112, and further ensuring that the second positive electrode identifier 1121 and the second negative electrode identifier 1123 can keep stable in shape, and further preventing the second positive electrode identifier 1121 and the second negative electrode identifier 1123 from being greatly changed in shape, so that the second positive electrode identifier 1121 and the second negative electrode identifier 1123 cannot be clearly recognized, and the second negative electrode identifier 1123 cannot be clearly recognized by a person, and the operator can easily recognize the shape of the second electrode identifier 1121.

Please refer to fig. 3 again. The connecting tab 116 is disposed on a side of the upper plastic 113 facing away from the top cover 111, the connecting tab 116 includes a positive connecting tab 1161 and a negative connecting tab 1162, the positive connecting tab 1161 is electrically connected to the positive post 1141, the negative connecting tab 1162 is electrically connected to the negative post 1142, the orthographic projection of the positive connecting tab 1161 on the first surface 1111 is staggered with the orthographic projection of at least one of the first positive identifier 1131 and the second positive identifier 1121 on the first surface 1111, and the orthographic projection of the negative connecting tab 1162 on the first surface 1111 is staggered with the orthographic projection of at least one of the first negative identifier 1133 and the second negative identifier 1123 on the first surface 1111.

Optionally, the connection tab 116 is electrically connected to the pole 114, and the connection tab 116 may be electrically connected to the pole 114 by soldering or other means. And the connection tabs 116 include a positive connection tab 1161 and a negative connection tab 1162, the positive connection tab 1161 is electrically connected to the positive post 1141, and the negative connection tab 1162 is electrically connected to the negative post 1142.

Optionally, the connecting tab 116 is aluminum bar.

Optionally, the connecting tab 116 is disposed on a side of the upper plastic 113 facing away from the top cover 111, and is partially disposed opposite to a surface of the upper plastic 113 facing away from the top cover 111.

Optionally, the front projection of the positive connection tab 1161 on the first surface 1111 is staggered from the front projection of at least one of the first positive electrode identifier 1131 and the second positive electrode identifier 1121 on the first surface 1111, in other words, the front projection of the positive connection tab 1161 on the first surface 1111 and the front projection of at least one of the first positive electrode identifier 1131 and the second positive electrode identifier 1121 on the first surface 1111 are not overlapped with each other. In other words, when the front projection of the connection tab 116 on the first surface 1111 covers, or partially covers, the front projection of the first positive electrode tab 1131 on the first surface 1111, the front projections of the connection tab 116 on the first surface 1111 and the front projections of the second positive electrode tab 1121 on the first surface 1111 are staggered with each other. Therefore, when or after the pole 114 and the connection tab 116 are welded, a machine or an operator can observe and identify at least one of the first positive electrode identifier 1131 and the second positive electrode identifier 1121, so that the polarity of the pole 114 is identified by the first positive electrode identifier 1131 or the second positive electrode identifier 1121, and subsequent assembly errors caused by the identification error of the polarity of the pole 114 are avoided, thereby improving the safety of the process and the finished product.

Optionally, the front projection of the negative electrode connection tab 1162 on the first surface 1111 is staggered from the front projection of at least one of the first negative electrode identifier 1133 and the second negative electrode identifier 1123 on the first surface 1111, in other words, the front projection of the positive electrode connection tab 1161 on the first surface 1111 and the front projection of at least one of the first negative electrode identifier 1133 and the second negative electrode identifier 1123 on the first surface 1111 are not overlapped with each other. Therefore, when or after the pole 114 and the connection tab 116 are welded, a machine or an operator can observe and identify at least one of the first negative electrode identifier 1133 and the second negative electrode identifier 1123, so that the polarity of the pole 114 is identified by the first negative electrode identifier 1133 and the second negative electrode identifier 1123, and subsequent assembly errors caused by the identification error of the polarity of the pole 114 are avoided, thereby improving the safety of the process and the production of the finished product.

Reference in the specification to "an embodiment," "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments. Furthermore, it should be understood that the features, structures or characteristics described in the embodiments of the present application may be combined arbitrarily without any conflict with each other, to form yet another embodiment without departing from the spirit and scope of the present application.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above-mentioned preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application.

Claims

1. An end cap assembly, said end cap assembly comprising:

2. The end cap assembly of claim 1, wherein the second positive indicia has a maximum width D in front projection on the first surface ₁ The maximum width of the orthographic projection of the first positive electrode mark on the first surface is D ₂ The maximum width D ₁ And the maximum width D ₂ The method meets the following conditions: d is more than or equal to 1.5 ₁ /D ₂ Less than or equal to 1.8; and/or the number of the groups of groups,

the maximum width of the orthographic projection of the second negative electrode mark on the first surface is D ₃ The maximum width of the orthographic projection of the first negative electrode mark on the first surface is D ₄ The maximum width D ₃ And the maximum width D ₄ The method meets the following conditions: d is more than or equal to 1.5 ₃ /D ₄ ≤1.8。

3. The end cap assembly of claim 1, wherein a perpendicular from a center point of the first positive electrode identifier to a central axis of the positive electrode post is a first line, and a perpendicular from a center point of the second positive electrode identifier to a central axis of the positive electrode post is a second line, wherein an included angle between the second line and the first line is 80 ° -90 °; and/or the number of the groups of groups,

4. The end cap assembly of claim 3, wherein the top surface of the plastic on the positive electrode is provided with two first positive electrode marks, and a connecting line of the two first positive electrode marks is intersected with the central axis of the positive electrode post; and/or the number of the groups of groups,

5. The end cap assembly of claim 1, wherein the plastic on the positive electrode has a thickness in the range D ₅ The first positive electrode mark is a groove, the groove is recessed in the surface of the plastic on the positive electrode along the direction of the plastic on the positive electrode pointing to the top cover, and the first positive electrode mark has a dimension range D in the thickness direction of the plastic on the positive electrode ₆ The size range D ₆ And the thickness range D ₅ The ratio of (2) is as follows: d is more than or equal to 0.08 ₆ /D ₅ Less than or equal to 0.1; and/or the number of the groups of groups,

6. The end cap assembly of claim 1, wherein the second positive electrode label has a closest distance range L from a perimeter of the positive electrode plastic adjacent the second positive electrode label ₁ The nearest distance range L ₁ The method meets the following conditions: l is less than or equal to 2mm ₁ Less than or equal to 8mm; and/or the number of the groups of groups,

7. The end cover assembly of claim 1, wherein the upper plastic is further provided with an injection molding point and a thimble position, the injection molding point is arranged on the surface of the upper plastic, which is away from the top cover, a perpendicular line from the center point of the injection molding point to the central axis of the pole is a fifth connecting line, a perpendicular line from the center point of the first positive electrode mark or the first negative electrode mark to the central axis of the pole is a sixth connecting line, and an included angle between the fifth connecting line and the sixth connecting line is 80-90 degrees;

8. The end cap assembly of claim 1, wherein the second positive electrode is identified as an indentation, and the indentation is disposed on a surface of the top patch facing away from the top cap; and/or the number of the groups of groups,

9. The end cap assembly of claim 1, wherein the second positive electrode label extends through the top patch in a thickness direction of the top patch; and/or the number of the groups of groups,

10. The end cap assembly of claim 9, wherein the top patch has a first color, the end cap assembly further comprising an identification tab disposed on a side of the second positive indicia and the second negative indicia adjacent the top cap, and the first identification tab has a third color, the third color being different from the first color.

11. The end cap assembly of claim 9, wherein the second positive identification has a plurality of sides joined by bends, at least two adjacent sides of the plurality of sides being joined by an arc angle; and/or the number of the groups of groups,

12. A battery cell, comprising an electrode assembly, a housing, and an end cap assembly according to any one of claims 1-11, wherein the electrode assembly is disposed in the housing, and the end cap assembly is electrically connected to the electrode assembly.

13. A battery assembly, comprising a wire harness isolation board, a plurality of connection tabs and a plurality of battery cells according to claim 12, wherein the connection tabs and the battery cells are arranged on two opposite sides of the wire harness isolation board at intervals, and the battery cells are electrically connected through the connection tabs;

14. An energy storage system, comprising:

user load;

the battery assembly of claim 13, wherein the battery assembly is electrically connected to the consumer load and the power conversion device, respectively, the battery assembly storing power converted by the power conversion device, the battery assembly powering the consumer load.