CN113013526B

CN113013526B - Battery cover plate, battery and preparation method of battery

Info

Publication number: CN113013526B
Application number: CN202110362208.8A
Authority: CN
Inventors: 杨昆仑; 李正东; 陈志勇
Original assignee: Guangdong Mic Power New Energy Co Ltd
Current assignee: Guangdong Mic Power New Energy Co Ltd
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2022-10-11
Anticipated expiration: 2041-04-02
Also published as: CN113013526A; WO2022206951A1

Abstract

The disclosure provides a battery cover plate, a battery and a preparation method of the battery. The battery cover plate includes: the cover plate penetrates along the thickness direction of the cover plate to form a first through hole; at least one part of the base is positioned in the first through hole, and an insulating part is arranged between the base and the cover plate; the base penetrates through the base along the thickness direction of the base to form a second through hole; at least one part of the cover cap is positioned in the second through hole and is detachably connected with the base, the cover cap and the base are in a separated state, and the second through hole is used as a liquid injection hole.

Description

Battery cover plate, battery and preparation method of battery

Technical Field

The disclosure relates to the technical field of batteries, in particular to a battery cover plate, a battery with the battery cover plate and a preparation method of the battery.

Background

A lithium ion battery is a large-capacity, high-power battery, which is mainly applied to small devices, for example, a lithium ion battery may be applied to a mobile phone. The lithium ion battery generally comprises a battery cover plate assembly, a battery can, electrolyte and a battery roll core formed by winding a positive plate, a negative plate and diaphragm paper.

Be provided with the opening on the battery apron, the opening part is provided with the block, and the block draws forth the electric current as an electrode of battery, need additionally set up the through-hole on the battery apron simultaneously as annotating the liquid hole, and consequently prior art's battery assembling process is loaded down with trivial details, and battery apron intensity is lower.

Disclosure of Invention

An object of the present disclosure is to provide a battery cap plate, a battery having the same, and a method of manufacturing the battery.

According to a first aspect of the present disclosure, a battery cover plate is provided. The battery cover plate includes:

the cover plate penetrates along the thickness direction of the cover plate to form a first through hole;

at least one part of the base is positioned in the first through hole, and an insulating part is arranged between the base and the cover plate; the base penetrates through the base along the thickness direction of the base to form a second through hole;

and at least one part of the cover cap is positioned in the second through hole and is detachably connected with the base, and the second through hole is used as a liquid injection hole when the cover cap is separated from the base.

Optionally, a connecting portion is disposed between the base and the cap.

Optionally, an inner thread is formed on an inner wall of the second through hole, an outer thread is formed on at least a part of an outer wall of the cap, and the base and the cap are screwed.

Optionally, the cap is embedded in the second through hole, and a sealing film is arranged between the cap and the base.

Optionally, the insulating member is disposed on an inner circumferential surface of the first through hole, and at least one of two ends of the insulating member extends outward in a radial direction of the first through hole and covers a surface of the cover plate.

Optionally, the insulating member further includes an insulating support arm along an axial direction of the first through hole;

the cover plate is provided with a containing groove along the thickness direction, and the insulating support arm is embedded in the containing groove.

Optionally, the base comprises a first base and a second base connected with the first base;

the first base is connected with the cover plate, and the second base penetrates through the first through hole.

Optionally, a first connecting surface is formed on one side of the first base, which is close to the second base, a second connecting surface is formed on one side of the second base, which is close to the first base, and the first connecting surface and the second connecting surface are oppositely arranged and connected;

along the radial direction of the first through hole, the size of the first connecting surface is larger than that of the second connecting surface, and the first connecting surface is arranged above a pole lug and is used for being electrically connected with the pole lug.

Optionally, the insulating member is disposed on an inner circumferential surface of the first through hole, and an upper end of the insulating member extends outward in a radial direction of the first through hole and covers an outer surface of the cover plate.

Optionally, the cover plate, the base and the insulating member are an integrally formed part.

According to a second aspect of the present disclosure, a battery is provided. The battery comprises a shell and the battery cover plate of the first aspect;

an opening is formed in one side of the shell, the battery cover plate covers the opening, and the cover plate is welded with the shell.

Optionally, at least a portion of the base extends to the inside of the case in a state where the battery cover covers the opening.

According to a third aspect of the present disclosure, a method of manufacturing a battery is provided. The method comprises the following steps:

providing a shell, wherein a battery cell is arranged in the shell;

providing a battery cover plate, welding the cover plate and the shell, and isolating a base and the cover plate through an insulator;

injecting an electrolyte into the housing through a second through hole in the base;

and arranging a cap in the second through hole to seal the battery.

Optionally, before the step of injecting the electrolyte into the housing through the second through hole on the base, the method further includes:

and welding the positive lug of the battery cell with the base, and welding the negative lug of the battery cell with the cover plate or the shell.

welding a negative electrode tab of the battery cell with the cover plate or the shell;

after the step of disposing a cap in the second through-hole to seal the battery, the method further includes:

and welding the positive lug of the battery cell with the cap.

The beneficial effect of this disclosure: the present disclosure provides a battery cover plate including a cover plate, an insulating member, a base, and a cap. Wherein the base can be dismantled with the block and be connected, when the block does not realize the assembly with the base, pours into electrolyte into through the last second through-hole of base. Compared with the prior art, the battery cover plate of the embodiment does not need to be provided with a through hole on the cover plate separately to serve as a liquid injection hole, so that the strength of the battery cover plate is improved.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic diagram illustrating an internal structure of a battery according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a cover and housing combination of a battery of the present disclosure.

Fig. 3 is a schematic structural view illustrating a base and cover assembly of the battery of the present disclosure.

Fig. 4 is a schematic structural view of the battery shown in fig. 1.

Fig. 5 is a schematic view showing an internal structure of a battery according to still another embodiment of the present disclosure.

Fig. 6 is a schematic structural view of the battery shown in fig. 5.

Fig. 7 is a schematic diagram of a battery cover plate structure of the battery shown in fig. 5.

Fig. 8 is a schematic view showing an internal structure of a battery according to still another embodiment of the present disclosure.

Fig. 9 is a schematic view of the structure of the battery shown in fig. 8.

Description of reference numerals:

1-battery cover plate, 11-cover plate, 111-first through hole 111, 12-metal terminal, 121-base, 122-cap, 123-second through hole, 124-sealing film, 13-insulator, 2-shell, 3-cell, 31-tab, 1211-first base, 1212-second base.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

According to one embodiment of the present disclosure, a battery cover plate is provided. Referring to fig. 1 to 9, the battery cap plate 1 includes: a cover plate 11, a base 121, a cap 122 and an insulator 13.

The cover plate 11 is formed with a first through hole 111 penetrating in its thickness direction. At least a portion of the base 121 is located within the first through hole 111. An insulator 13 is disposed between the base 121 and the cover plate 11. The base 121 has a second through hole 123 formed therethrough in a thickness direction thereof. At least a portion of the cap 122 is disposed in the second through hole 123 and detachably connected to the base 121. When the cap 122 is separated from the base 121, the second through-hole 123 serves as a pour hole.

Specifically, referring to fig. 2, the cover plate 11 is provided with a first through hole 111, and the first through hole 111 penetrates through the cover plate 11 in a thickness direction. At least a portion of the base 121 is located in the first through hole 111, that is, the base 121 may be entirely disposed in the first through hole 111 or partially disposed in the first through hole 111. In a state where at least a portion of the base 121 is located in the first through hole 111, an insulator 13 is disposed between the base 121 and the cover plate 11, the insulator 13 isolates the base 121 and the cover plate 11, and the insulator 13 prevents the base 121 and the cover plate 11 from being in direct contact. In the application of the battery cover plate 1 to a battery, the base 121 and the cover plate 11 are separated by the insulating member 13, and the short circuit of the battery caused by the contact between the base 121 and the cover plate 11 is avoided. In one embodiment, the cover plate 11 is made of metal. For example, the cover plate 11 may be made of steel or aluminum.

Referring to fig. 3, the base 121 is formed with a second through hole 123, and the second through hole 123 penetrates through the base 121 in a thickness direction. At least a portion of the cap 122 is located in the second through hole 123, that is, the cap 122 may be located entirely in the second through hole 123 or partially in the second through hole 123.

The cap 122 is detachably connected to the base 121, so that the cap 122 and the base 121 may be in a mutually assembled state or a separated state.

When the cap 122 and the base 121 are in a separated state, the electrolyte is injected through the second through hole 123. The second through-hole 123 serves as a pour hole. For example, the battery cap plate 1 is applied to a battery, and an electrolyte is injected into the battery through the second through-hole 123 while the cap 122 is not yet placed on the second through-hole 123. After the electrolyte is injected into the battery through the second through hole 123, the cap 122 is assembled with the base 121 through the second through hole 123 to seal the battery, and at this time, the second through hole 123 serves as a mounting hole for mounting the cap 122, and the cap 122 seals the battery.

In the assembled state of the cap 122 and the base 121, the cap 122 and the base 121 constitute the metal terminal 12. The metal terminal 12 may be entirely located within the first via hole 111, or may be partially located within the first via hole 111. The metal terminal 12 serves as a lead-out terminal of the battery electrode. In one embodiment, two first through holes 111 may be formed on the cover plate 11, and the two first through holes 111 are spaced apart; the battery cover plate includes two metal terminals 12, and the two metal terminals 12 are respectively located in the first through holes 111. The battery cover plate 1 can be used for a battery with the positive and negative electrodes on the same side. In one embodiment, the cap 122 and the base 121 may be made of metal, or one of them may be made of metal and the other may be made of rubber.

Thus, the battery cap plate 1 according to the embodiment of the present disclosure includes the cap plate 11, the insulator 13, the base 121, and the cap 122. Wherein the base 121 is detachably connected to the cap 122, and when the cap 122 is not assembled with the base 121, the electrolyte is injected through the second through hole 123 of the base 121. Compared with the prior art, the battery cover plate 1 of the present embodiment does not need to be separately provided with a liquid injection hole, the base 121 serving as an electrode leading-out end and the cap 122 are connected in a detachable connection mode, and when the cap 122 and the base 121 are not assembled, electrolyte is injected through the second through hole 123 on the base 121. The battery cover plate 1 provided by the embodiment of the disclosure has a simple structure and is convenient to assemble. In the battery cover plate 1 of the present example, it is not necessary to separately form a through hole in the cover plate 11 as a liquid injection hole, and the strength of the battery cover plate 1 is improved.

In an alternative embodiment, a connection portion is provided between the base 121 and the cap 122. For example, the base 121 and the cap 122 are detachably connected by a connecting portion. For example, the cap 122 may be assembled with the base 121 through a connection portion to form a metal terminal 12, and the metal terminal 12 can serve as a terminal of a battery electrode. For example, the cap 122 is detachable from the base 121 via a connector, and electrolyte is injected into the battery through the second through hole 123.

In an alternative embodiment, referring to fig. 1 and 5, an inner wall of the second through hole 123 is formed with an internal thread, and at least a portion of an outer wall of the cap 122 is formed with an external thread, and the base 121 and the cap 122 are screwed together.

In this embodiment, the base 121 and the cap 122 are detachably connected by a screw connection. Further, in order to enhance the sealability between the base 121 and the cap 122, a sealant is coated on the male screw formed on the outer wall of the base 121 and/or a sealant is coated on the female screw formed on the inner wall of the second through-hole 123.

Specifically, the second through hole 123 is a screw hole in the present embodiment, and the base 121 and the cap 122 are filled with the electrolyte through the screw hole before the assembly is not yet achieved. After the electrolyte is injected through the screw hole, the cap 122 is screw-coupled to the base 121. In this example, the connection portion includes an internal thread and an external thread.

In an alternative embodiment, the connection portion may also be a magnetic component. For example, a first magnetic member is disposed on an inner wall of the second through hole 123, a second magnetic member is disposed on an outer wall of the cap 122, and the base 121 and the cap 122 are detachably connected through the first magnetic member and the second magnetic member.

In an alternative embodiment, referring to fig. 8, the cap 122 is embedded in the second through hole 123, and a sealing film 124 is disposed between the cap 122 and the base 121.

In one embodiment, the second through hole 123 is a stepped hole including a first hole and a second hole communicating with the first hole, the first hole having a radial dimension larger than that of the second hole, and the cap is fixed in the first hole. Specifically, the second through-hole 123 is sealed by the cap 122 by means of heat sealing, for example, a sealing film 123 may be heat-sealed at a step, and the second through-hole 123 may be blocked by the cap 122.

In another embodiment, the base 121 and the cap 122 are connected by an interference fit. Specifically, a sealing film is provided on the inner peripheral surface of the second through-hole 123, and the cap 122 is fitted into the second through-hole 123 with the sealing film 124 between the cap 122 and the base 121. Wherein a sealing film is provided at the junction of the cap 122 and the base 121, the sealability of the cap 122 and the base 121 is improved. On the other hand, providing a sealing film at the joint of the cap 122 and the base 121 improves the joint strength of the cap 122 and the base 121.

In one particular embodiment, the sealing film 124 is a PP composite film. At least a contact portion between the base 121 and the cap 122 is sealed with a PP composite film.

The base 121 and the cap 122 are detachably sealed. In a state where the base 121 and the cap 122 are separated, an electrolyte is injected through the second through hole 123. In the assembled state of the base 121 and the cap 122, the base 121 and the cap 122 are sealingly connected.

It should be noted that the base 121 and the cap are detachably connected by, but not limited to, a screw connection, a thermal compression connection, or an interference fit connection.

Alternatively, as shown in fig. 1, 5 and 8, the insulating member 13 is disposed on the inner circumferential surface of the first through hole 111, and at least one of two ends of the insulating member 13 extends outward in the radial direction of the first through hole 111 and covers one surface of the cap plate 11.

The insulating member 13 is disposed on an inner circumferential surface of the first through hole 111, and the insulating member 13 includes two ends disposed opposite to each other. The oppositely disposed ends include an upper end and a lower end. At least one of the upper and lower ends extends outward in a radial direction of the first through hole 111 and covers a surface of the cover plate.

In one embodiment, referring to fig. 1, the insulating member 13 is disposed on an inner circumferential surface of the first through hole 111, and both ends of the insulating member 13 extend outward in a radial direction of the first through hole 111 and cover upper and lower surfaces of the cover plate 11, respectively.

For example, in fig. 1, the base 121 includes a first base and a second base connected to the first base. The first base is of a cylindrical structure. The second base is located at the lower end of the first base and extends out of the first through hole 111. The second base extends radially outward of the first through hole 111 to cover the outer surface of the insulating member 13 and not beyond the edge of the insulating member 13. For example, the first base and the second base are integrally formed to form the base 121.

The cap 122 includes a first cap body and a second cap body connected to the first cap body. The first cap body is a cylindrical structure and is connected to the base 121 through the second through hole 123. The second cap body is positioned on the first cap body and extends out of the first through hole 111. The second cap extends radially outwardly of the first through hole 111 over the outer surface of the insulator 13 and does not extend beyond the edge of the insulator 13. For example, the first cap body and the second cap body are integrally formed to form the cap 122.

In still another embodiment, as shown in fig. 3 and 6, the insulating member 13 is provided on the inner circumferential surface of the first through hole 111, and the upper end of the insulating member 13 extends outward in the radial direction of the first through hole 111 and covers the upper surface of the cap plate 11.

For example, in fig. 8, the base 121 includes a first base and a second base connected to the first base. The first base is of a cylindrical structure, the lower end of the first base extends out of the first through hole 111 and extends out of the first through hole by a preset distance, and the lower end of the first base is used for being connected with the tab. Because the lower extreme of first base stretches out first through-hole 111, and the first base lower extreme that stretches out first through-hole 111 is connected with the utmost point ear, consequently there is the distance of predetermineeing between utmost point ear and the apron 11 that electric core was drawn forth, wherein the distance of predetermineeing that exists between the two can avoid utmost point ear and 11 contacts of apron. The lower surface of the cover plate 11 in this example is not covered with an insulating member.

A second base of the base 121 is located at the upper end of the first base, and the second base extends along the radial direction of the first through hole 111 and covers a portion of the outer surface of the insulating member 13 and does not extend beyond the edge of the insulating member 13.

Through holes are formed in both the first base and the second base of the base 121, wherein the through hole formed in the first base is communicated with the through hole formed in the second base to form a second through hole 123. The second through hole 123 is a stepped hole in the present embodiment. A cap 122 is placed over the stepped hole, wherein the upper surface of the cap 122 is flush with the upper surface of the second base. The cap 122 in this embodiment is a cylindrical structure.

Further, referring to fig. 5, along the axial direction of the first through hole 111, the insulating member 13 further includes an insulating arm 131, the cover plate 11 is formed with a receiving groove along the thickness direction thereof, and the insulating arm 131 is embedded in the receiving groove.

For example, the insulating support arm 131 is disposed on the insulating member 13, and the insulating support arm 131 is connected to the cover plate 11, so that the connection area between the insulating member 13 and the cover plate 11 is increased, and the connection strength between the insulating member 13 and the cover plate 11 can be further enhanced. In one embodiment, the insulating arm 131 is disposed in a direction perpendicular to the extending direction of the insulating member 13.

In an alternative embodiment, as shown in fig. 1, 5 and 8, the base 121 includes a first base 1211 and a second base 1212 connected to the first base 1211. The first base 1211 is connected to the cover plate 11, and the second base 1212 penetrates the first through hole 111. For example, the radial dimension of the first base 1211 is greater than the radial dimension of the second base 1212, the first base 1211 can be coupled to the upper surface of the cap plate 11 while the insulating member 13 is disposed between the first base 1211 and the upper surface of the cap plate 11. This example improves the reliability of the connection of the base 121 and the cover plate 11.

In one embodiment, referring to fig. 5 and 7, a first connecting surface is formed on a side of the first base 1211 close to the second base 1211, a second connecting surface is formed on a side of the second base 1212 close to the first base 1211, and the first connecting surface and the second connecting surface are oppositely disposed and connected.

In the radial direction of the first through hole 111, the size of the first connection surface is larger than that of the second connection surface, and the first connection surface is disposed above the tab 31 for electrically connecting with the tab 31.

Specifically, referring to fig. 3 and 5, the first base 1211 and the second base 1212 are integrally formed. Through holes are respectively formed in the first base 1211 and the second base 1212, and the through hole formed in the first base 1211 and the through hole formed in the second base 1212 are communicated to form the second through hole 123.

The first base 1211 has a T-shaped structure, in which a lower end of the first base 1211 extends through the first through hole 111, and the lower end of the first base 1211 extends a predetermined distance.

The second base 1212 has a trapezoid structure, wherein the length of the upper base of the second base 1212 is greater than the length of the lower base of the second base 1212.

The first connecting surface formed at the lower end of the first base 1211 is connected to the second connecting surface formed at the upper bottom of the second base 1212. Since the size of the first connection surface is larger than that of the second connection surface along the radial direction of the first through hole 111, the first connection surface is formed with an extension surface with respect to the second connection surface along the radial direction of the first through hole 111 after the first and

second bases

1211 and 1212 are connected.

In the application of the battery cover plate 1 to a battery, the battery includes a case 2 and a battery cell 3 disposed inside the case 2. The battery cell 3 is led out of the tab 31, and the extending surface is located above the tab 31 and electrically connected with the tab 31, for example, the extending surface is welded with the tab 31. Because the extension surface is pressed above the tab 31, the displacement of the tab 31 along the height direction of the battery is limited, the tab 31 is prevented from contacting with the cover plate 11, and the short circuit phenomenon of the battery is prevented.

Further, referring to fig. 5, the insulating member 13 is disposed on the inner circumferential surface of the first through hole 111, and an upper end of the insulating member 13 extends outward in a radial direction of the first through hole 111 and covers the outer surface of the cap plate 11.

Due to the specific structure design of the base 121, the first connection surface formed at the lower end of the first base 1211 of the base 121 can press on the tab 31, so that the displacement of the tab 31 along the height direction of the battery is limited, the tab 31 is prevented from contacting the cover plate 11, and the short circuit phenomenon of the battery is prevented.

Therefore, the insulating member 13 of the present example is disposed on the inner circumferential surface of the first through hole 111, and the insulating member 13 includes an upper end and a lower end which are oppositely disposed, wherein it is only required that the upper end of the insulating member 13 extends outward in the radial direction of the first through hole 111 and covers the outer surface of the cap plate to prevent the base 121 from directly contacting the cap plate 122 to cause a short circuit of the battery.

In an alternative embodiment, the cover plate 11, the base 121 and the insulating member 13 are an integral member.

For example, the cover plate 11, the base 121 and the insulating member 13 are integrally formed by injection molding. The cover plate 11, the base 121 and the insulator 13 are an integral structure. The assembly process of the battery cover plate 1 of the present example is simple and convenient for the user to operate. In one example, when the battery cover 1 is applied to a battery, an integrated structure of the cover 11, the base 121, and the insulator 13 is first connected to the case 2 of the battery. And then the electrolyte is injected through the second via hole 123 formed on the base 121. Finally, the cap 122 is disposed on the second through hole 123 to seal the battery.

In an alternative embodiment, the base 121 is made of the same material as the cap 122.

For example, the base 121 and the cap 122 may both be made of aluminum. The base 121 is made of the same material as the cap 122, and the base 121 and the cap 122 can serve as the same electrode to draw out a battery current.

For example, the base 121 and the cap 122 may both serve as a positive electrode to draw battery current. For example, the battery cover plate 1 is applied to a battery, and the positive tab of the battery cell 3 is welded to the base 121 or the positive tab of the battery cell 3 is welded to the cap 122.

According to one embodiment of the present disclosure, a battery is provided. Referring to fig. 1 to 9, the battery cover plate 1 comprises a housing 2 and the battery cover plate according to the first aspect. An opening is formed in one side of the shell 2, the battery cover plate 1 covers the opening, and the cover plate 11 is welded with the shell 2.

For example, the housing 2 includes side walls, which surround the housing 2 in the circumferential direction, and the side walls surround the housing in a cylindrical shape or the side walls surround the housing in a cubic structure. At least one end of the case 2 is formed with an opening, and the battery cover plate 1 closes the opening.

In a specific embodiment, the housing 2 comprises side walls and a bottom wall, wherein the side walls and the bottom wall are integrally formed. The end of the case 2 opposite to the bottom wall forms an opening, and the battery cover plate 1 closes the opening.

The cover plate 11 and the housing 2 may be connected by laser welding or resistance welding.

In an alternative embodiment, the cover plate 11 is made of the same material as the housing 2.

For example, the cover plate 11 and the housing 2 are made of steel, the cover plate 11 and the housing 2 can serve as terminals for the same electrode of the battery, and the base 121 and the cap 122 can serve as terminals for the other electrode of the battery. For example, the battery cell 3 includes a positive tab electrically connected to the base 121 or the cap 122, and a negative tab electrically connected to the case cover plate 11 or the case 2, so as to ensure normal use of the battery.

In an alternative embodiment, referring to fig. 5, at least a portion of the base 121 extends to the inside of the case 2 in a state where the battery cover plate 1 covers the opening.

For example, the base 121 includes a first base 1211 and a second base 1212, wherein the second base 1212 extends into the housing 2, so as to further improve the sealing performance between the battery cover 1 and the housing 2.

According to an embodiment of the present disclosure, there is provided a method of manufacturing a battery, the method including the steps of:

providing a shell 2, wherein a battery cell 3 is arranged in the shell 2;

providing a battery cover plate 1, welding a cover plate 11 with the shell 2 and separating a base 121 from the cover plate 11 through an insulator 13;

injecting an electrolyte into the case 2 through a second through hole 123 of the base 121;

disposing a cap 122 within the second through-hole 123 seals the battery.

Specifically, the housing 2 is provided, and the material of the housing 2 may be steel. Casing 2 is formed with and holds the chamber, and electric core 3 is located and holds the intracavity.

The cover plate 11 is welded to the housing 2. The cover plate 11 is penetrated along the thickness direction to form a first through hole 111, and the base 121 is positioned in the first through hole 111; and the base 121 is isolated from the cover plate 11 by the insulator 13. In a preferred embodiment, the cover plate 11, the insulator 13 and the base 12 are integrally formed as a single structural member. The integrated structural member is covered on the housing 2.

Then, the electrolyte is injected into the case 2 through the second through hole 123 formed on the base 121.

Finally, the cap 122 is hermetically connected to the base 121 through the second through hole 123.

Because the cap 122 is detachably connected with the base 121, compared with the prior art, the battery cover plate 1 of the present embodiment does not need to separately provide a through hole on the cover plate 11 as a liquid injection hole, and the strength of the battery cover plate 1 is improved. On the other hand, the cover plate 122 is detachably connected to the base 121, so that the electrolyte can be easily supplied into the case 2.

On the other hand, in this example, the cover plate 11 is welded to the case 2, and then the electrolyte is injected into the case 2 through the second through hole 123 formed in the base 121. In the prior art, in the assembly process of the battery, electrolyte is injected into the shell, and then the battery cover plate and the shell are welded. Compared with the prior art, the battery assembly method changes the assembly sequence of the battery, and avoids the influence of high temperature generated during welding of the shell and the cover plate on the property of the electrolyte injected firstly.

Optionally, before the step of injecting the electrolyte into the housing 2 through the second through hole 123 on the base 121, the method further includes:

and welding the positive tab of the battery cell 3 with the base 121, and welding the negative tab of the battery cell 3 with the cover plate 11 or the shell 2.

Specifically, the battery cell 3 includes a positive electrode tab and a negative electrode tab. The base 121 serves as a positive electrode terminal, and the lid plate 11 or the case 2 serves as a negative electrode terminal. The positive tab of the cell 3 may be welded to the base 121, the negative tab of the cell 3 may be welded to the cover plate 11 or the case 2, and then the electrolyte may be injected into the case 2 through the second through hole 123 of the base 121.

Optionally, before the step of injecting the electrolyte into the case 2 through the second through hole 123 on the base 121, the method further includes:

welding a negative electrode tab of the battery cell 3 with the cover plate 11 or the shell 2;

after the step of disposing the cap 122 in the second through hole 123 to seal the battery, the method further includes:

and welding the positive tab of the battery cell 3 with the cap 122.

Specifically, the base 121 and the cap 122 draw current as the same pole of the battery. The present example welds cap 122 to the positive tab of cell 3.

In the present example, the cell 3 includes a positive electrode tab and a negative electrode tab. The cap 122 serves as a positive electrode terminal, and the lid plate 11 or the case 2 serves as a negative electrode terminal.

Before the step of injecting the electrolyte into the case 2 through the second through hole 123 of the base 121, the negative electrode tab of the cell 3 is welded to the cover plate 11 or the case 2.

After the step of disposing the cap 122 in the second through hole 123 to seal the battery, the positive tab of the battery cell 3 is welded to the cap 122 by a laser disposed outside the case 2.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A battery cover plate, comprising:

at least one part of the base is positioned in the first through hole, and an insulating part is arranged between the base and the cover plate; the base penetrates along the thickness direction to form a second through hole;

the base comprises a first base and a second base, a first connecting surface is formed on one side of the first base, which is close to the second base, a second connecting surface is formed on one side of the second base, which is close to the first base, and the first connecting surface and the second connecting surface are oppositely arranged and connected;

along the radial direction of the first through hole, the size of the first connecting surface is larger than that of the second connecting surface, and the first connecting surface is arranged above a pole lug and is used for being electrically connected with the pole lug;

and at least one part of the cap is positioned in the second through hole and is detachably connected with the base, and the second through hole is used as a liquid injection hole when the cap is separated from the base.

2. The battery cover plate according to claim 1, wherein a connecting portion is provided between the base and the cap.

3. The battery cover plate according to claim 1 or 2, wherein an inner wall of the second through hole is formed with an internal thread, and at least a part of an outer wall of the cap is formed with an external thread, and the base and the cap are screw-coupled.

4. The battery cover plate of claim 1, wherein the cap is embedded in the second through hole, and a sealing film is disposed between the cap and the base.

5. The battery cap plate according to claim 1, wherein the insulating member is provided on an inner circumferential surface of the first through-hole, and at least one of both ends of the insulating member extends outward in a radial direction of the first through-hole and covers a surface of the cap plate.

6. The battery cover plate according to claim 5, wherein the insulating member further includes an insulating arm in an axial direction of the first through hole;

7. The battery cover plate according to claim 1, wherein the first base is connected to the cover plate, and the second base penetrates the first through hole.

8. The battery cover plate according to claim 1, wherein the insulating member is provided on an inner circumferential surface of the first through hole, and an upper end of the insulating member extends outward in a radial direction of the first through hole and covers an outer surface of the cover plate.

9. The battery cover plate according to claim 1, wherein the cover plate, the base and the insulating member are an integrally formed member.

10. A battery comprising a case and the battery cover plate according to any one of claims 1 to 9;

11. The battery of claim 10, wherein at least a portion of the base extends into the housing interior in a state where the battery cover covers the opening.

12. A method of making a cell according to any one of claims 10 to 11, comprising the steps of:

providing a shell, wherein a battery cell is arranged in the shell;

providing a battery cover plate, welding the cover plate with the shell, and separating the base from the cover plate through an insulator;

injecting electrolyte into the housing through a second through hole in the base;

disposing a cap in the second through hole to seal the battery;

before the step of injecting the electrolyte into the housing through the second through hole on the base, the method further comprises:

and welding one polar lug of the battery cell with the base, and welding the other polar lug of the battery cell with the cover plate or the shell.