CN219610686U - Battery cover plate and battery - Google Patents

Abstract

The utility model belongs to the technical field of energy storage, and discloses a battery cover plate and a battery. The cover plate body is vertically provided with a pole column hole. The pole is penetrated in the pole hole, a countersunk head hole is penetrated in the pole, the countersunk head of the countersunk head hole is positioned on the upper side of the pole, and the countersunk head hole is used for the pole lug group to stretch in. The welding piece is subjected to hot melting to enable the tab group and the pole to be connected into a whole, and the cooled welding piece is used for sealing the countersunk holes. According to the utility model, the tab group is locally positioned in the counter sunk hole, the connection position of the tab group and the pole is positioned on the pole, so that the occupation of the internal space of the shell is less, the space between the tab and the battery cell in the shell is saved, the winding core can be designed to be wider, and the energy density of the battery is improved. The battery including the battery cover plate has higher energy density.

Description

Battery cover plate and battery

Technical Field

The utility model relates to the technical field of energy storage, in particular to a battery cover plate and a battery.

Background

The battery mainly comprises a shell, a battery cover plate, a pole and a winding core (electric core) arranged in the shell, wherein the pole is arranged on the battery cover plate in a penetrating mode, a pole lug group is arranged on the winding core, one end, far away from the winding core, of the pole lug group is bent to be horizontal, and the pole lug group is connected with the pole on the battery cover plate through a connecting sheet, so that the pole can be electrified with the winding core. However, in the battery with the design, a space for placing the bent tab is reserved between the tab and the winding core, and the tab group occupies more space inside the shell, so that the width of the winding core is narrower, and the energy density of the battery is lower.

Therefore, the above-described problems are to be solved.

Disclosure of Invention

The utility model aims to provide a battery cover plate and a battery so as to improve the energy density of the battery.

To achieve the purpose, the utility model adopts the following technical scheme:

in one aspect, the present utility model provides a battery cover plate comprising:

the cover plate body is vertically provided with a pole hole;

the pole is penetrated through the pole hole, a countersunk head hole is penetrated through the pole, the countersunk head of the countersunk head hole is positioned on the upper side of the pole, and the countersunk head hole is used for the pole lug group to extend in; and

and the tab group is welded with the pole column into a whole through the welding piece, and the counter bore is sealed.

Preferably, the battery cover plate further comprises a connecting piece, one end of the connecting piece is welded with the tab group, and the other end of the connecting piece penetrates through the counter bore and is welded with the pole post into a whole through the welding piece.

Preferably, the connection part of the connecting piece and the tab group is coated with high-temperature gummed paper.

Preferably, the welding piece is an aluminum sheet, and the aluminum sheet fills the counter bore so as to seal the counter bore.

Preferably, the battery cover plate further comprises an upper plastic and a lower plastic, wherein the upper plastic and the lower plastic are respectively arranged on the upper side and the lower side of the cover plate body, and the pole hole penetrates through the cover plate body, the upper plastic and the lower plastic at the same time.

Preferably, the cover plate body further includes:

the explosion-proof valve is arranged in the explosion-proof hole.

Preferably, the cover plate body further includes:

a bursting disc for blocking the bursting hole;

and the weak part is arranged on the explosion-proof sheet and used for breaking the explosion-proof sheet so as to allow the gas exhausted by the explosion-proof valve to pass through.

Preferably, the part of the tab group extending into the countersunk hole is bent, and is lapped on the bottom wall of the countersunk head and connected with the bottom wall of the countersunk head.

Preferably, the cover plate body is provided with a liquid injection hole, the liquid injection hole is used for injecting electrolyte, a sealing plug is arranged in the liquid injection hole, and the sealing plug is used for sealing the liquid injection hole.

In another aspect, the utility model provides a battery, which comprises a shell, a winding core and a battery cover plate as described above, wherein the shell is provided with an opening, the winding core is arranged in the shell, and the battery cover plate seals the opening.

The utility model has the beneficial effects that:

according to the utility model, the tab group firstly passes through the countersunk hole on the pole, so that the bent part of the tab group is positioned in the countersunk hole, the bent part of the tab group is welded with the bottom wall of the countersunk hole, the connection between the tab group and the pole is realized, and finally the tab group and the pole are connected into a whole through the welded piece after hot melting, so that the connection between the tab group and the pole can be reinforced, the countersunk hole can be sealed, and the connection position of the tab group and the pole is positioned in the countersunk hole of the pole, so that the bent part of the tab group does not occupy the space between the pole and the electric core in the shell, and the occupation of the space in the shell is less, thereby the winding core can be designed to be wider, and the energy density of the battery can be improved. Meanwhile, for the battery cell with a shorter tab group, the connecting piece is welded on the tab group, so that the connecting piece stretches into the countersink and is bent and lapped on the bottom wall of the countersink, and the applicability of the battery cover plate is improved; and, the high temperature gummed paper that the welding position that connecting piece and utmost point ear group set up can also reduce the junction and generate heat the influence that causes to the battery.

Drawings

Fig. 1 is a schematic view of a battery cover plate according to the present utility model;

FIG. 2 is a cross-sectional view of a battery cover plate provided by the present utility model;

FIG. 3 is an enlarged view at A in FIG. 2;

fig. 4 is a schematic structural diagram of a battery cover plate according to a second embodiment.

In the figure:

100. a tab group; 1. a cover plate body; 11. a post hole; 12. explosion-proof holes; 13. a liquid injection hole; 2. a pole; 21. a countersunk hole; 3. a welding member; 4. applying plastic; 5. lower plastic; 6. a connecting piece; 7. high temperature gummed paper.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", etc., azimuth or positional relationship are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description and simplification of operations, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Based on the foregoing, the battery in the prior art mainly comprises a housing, a battery cover plate, a pole and a winding core (winding core) arranged in the housing, wherein the pole is arranged on the battery cover plate in a penetrating manner, a pole lug group is arranged on the winding core, one end of the pole lug group, which is far away from the winding core, is bent to be horizontal, and the pole lug group is connected with the pole post of the cover plate through a connecting sheet, so that the pole post can be electrified with the winding core. However, the battery with the design occupies more space in the shell, so that the width of the winding core is narrower, and the energy density of the battery is lower.

Example 1

Referring to fig. 1 to 3, the present embodiment provides a battery cover and a battery, wherein the battery cover includes a cover body 1, a post 2 and a welding member 3. Wherein, the cover plate body 1 is vertically provided with a pole hole 11, and the pole 2 is arranged in the pole hole 11 in a penetrating way. The counter sunk hole 21 is formed in the pole 2 in a penetrating manner, the counter sunk of the counter sunk hole 21 is located on the upper side of the pole 2, and the counter sunk hole 21 is used for enabling the pole lug group 100 to extend in. The welding member 3 welds the tab group 100 and the pole 2 as one body, and seals the counterbore 21.

In practical application, the tab group 100 passes through the countersunk hole 21 on the pole 2, and the bent part of the tab group 100 is located in the countersunk hole 21, in other words, the bent part of the tab group 100 is lapped on the bottom wall of the countersunk hole, and the bent part of the tab group 100 is welded on the bottom wall of the countersunk hole, and finally the tab group 100 and the pole 2 are welded into a whole through the welding piece 3, and the countersunk hole 21 is sealed, so that the connection between the tab group 100 and the pole 2 is realized. Because the tab group 100 is locally located in the counter bore 21, and the connection position of the tab group 100 and the pole 2 is located on the pole 2, a space for the bent tab group 100 is not needed between the pole 2 and the battery cell, and the occupation of the tab group 100 to the inner space of the shell is less, so that the winding core can be designed to be wider, and the energy density of the battery can be improved.

It should be noted that, two pole holes 11 are formed on the cover plate body 1 corresponding to the positive pole and the negative pole, and the connection modes of the positive pole and the negative pole and the pole ear group 100 are identical, which is not described in detail in this embodiment. In other embodiments, the pole 2 may be cylindrical or square, and when the pole 2 is square, the counter bore 21 formed in the pole 2 may be square or circular. When the pole 2 is cylindrical, the counter bore 21 in the pole 2 is circular in shape. The scheme can adapt to various cover plate structures, and specific requirements and limitations are not made on the cover plate structures.

Specifically, the welding member 3 is an aluminum sheet, and the aluminum sheet is welded and melted with the pole 2 and the tab group 100 to seal the counterbore 21. It can be appreciated that the corrosion resistance of the welding point can be made high by welding the tab 2 and the tab group 100 with the aluminum sheet to ensure the welding quality. The manner of welding the aluminum sheet is the prior art and will not be described in detail.

Preferably, the battery cover plate further comprises an upper plastic 4 and a lower plastic 5, wherein the upper plastic 4 and the lower plastic 5 are respectively arranged on the upper side and the lower side of the cover plate body 1, and the pole holes 11 penetrate through the upper plastic 4, the cover plate body 1 and the lower plastic 5 from top to bottom. It can be understood that the arrangement of the upper plastic 4 and the lower plastic 5 can ensure that the battery cover plate has good insulating performance. It should be noted that in the present embodiment, two upper plastics 4 are provided corresponding to the positive and negative electrode columns, the lower plastics 5 are a whole plastic layer and are adhered to the lower side of the cover plate body 1, and the upper plastics 4 and the lower plastics 5 are all of the prior art and are not described in detail.

In order to improve the applicability of the battery cover plate, the cover plate body 1 further comprises an explosion-proof valve and a sealing plug. The cover plate body 1 is provided with an explosion-proof hole 12, and the explosion-proof valve is arranged in the explosion-proof hole 12. The cover plate body 1 is provided with a liquid injection hole 13, a sealing plug is arranged in the liquid injection hole 13, and the sealing plug is used for sealing the liquid injection hole 13. Specifically, the explosion-proof hole 12 is formed in the middle of the cover plate body 1, and the liquid injection hole 13 is formed between the explosion-proof hole 12 and the negative electrode column hole. It should be noted that, the explosion-proof valve is in the prior art, and details are not described in this embodiment. In practical use, the gas generated by chemical reaction in the battery can be discharged from the battery through the explosion-proof valve, and can rapidly react to excessive internal pressure to prevent explosion of the battery.

It will be appreciated that the electrolyte can be injected into the battery through the injection hole 13 during the battery production process, so that the operation of injecting the electrolyte can be performed more efficiently and accurately. And after electrolyte is injected into the battery, the sealing plug is used for blocking the liquid injection hole 13, so that the sealability of the battery is improved. Of course, in other embodiments, after the sealing plug is used to seal the liquid injection hole 13, a metal sheet may be welded on the periphery of the liquid injection hole 13 to further seal the liquid injection hole 13, so as to further help to improve the tightness of the battery. In addition, the inner wall of the liquid injection hole 13 extends out of a circular ring, and a metal sheet can be directly hot-melted on the inner ring of the liquid injection hole 13, and after the metal sheet is cooled, the liquid injection hole 13 is sealed.

In addition, in order to reduce the production cost of the battery, in other embodiments, the explosion-proof hole 12 and the liquid injection hole 13 may be provided as one hole. When the explosion-proof hole 12 and the liquid injection hole 13 are formed as one hole, it is necessary to inject the electrolyte into the battery during the production process of the battery, and then install the explosion-proof valve into the hole. Of course, the explosion-proof hole 12 and the liquid injection hole 13 are arranged as one hole, and the installation of the blocking valve and the related procedures can be omitted, so that the assembly efficiency in the battery production process can be improved while the production cost of the battery is reduced.

Based on the above, in order to reduce the impact of foreign matters falling into the explosion-proof hole 12 on the efficiency of the explosion-proof valve, the cover plate body 1 further includes an explosion-proof sheet, which seals the explosion-proof hole 12. In actual application, after the explosion-proof valve is installed, the explosion-proof sheet is welded on the periphery of the explosion-proof hole 12, and meanwhile, the explosion-proof sheet is guaranteed to cover the explosion-proof hole 12, so that foreign matters can be effectively reduced from falling into the explosion-proof hole 12.

It should be noted that, in order to ensure the normal operation of the explosion-proof valve, the explosion-proof plate is provided with a weak portion for breaking the explosion-proof plate to allow the gas discharged from the explosion-proof valve to pass through. It can be understood that when the internal pressure of the battery is excessively high due to the gas generated by the chemical reaction, the explosion-proof valve is opened, and the gas breaks through the weak part on the explosion-proof piece and is discharged to the outside of the battery, so that the gas can be normally discharged out of the battery when the internal pressure of the battery is excessively high.

The embodiment also provides a battery, and it includes foretell battery cover plate, casing and book core, and the casing has the opening, and the book core is installed in the casing, battery cover plate shutoff opening to make the book core in this battery can design wider, and then help promoting the energy density of battery.

Example two

Referring to fig. 4, the present embodiment is different from the first embodiment in that in the present embodiment, the battery cover further includes a connecting member 6, one end of the connecting member 6 is welded to the tab group 100, and the other end passes through the counter bore 21 and is welded to the pole 2 integrally by the welding member 3.

When the tab group 100 extending from the winding core is short, that is, the length of the tab group 100 is not enough to be lapped on the bottom wall of the countersink 21, the connecting piece 6 can be welded on the tab group 100, and one end of the connecting piece 6 far away from the tab group 100 passes through the countersink 21 and is bent, so that the bent part of the connecting piece 6 is lapped on the bottom wall of the countersink 21 and welded with the bottom wall of the countersink, and finally the countersink 21 is sealed by an aluminum sheet, so that the connection between the winding core and the post 2 can be realized, thereby being beneficial to improving the applicability of the battery cover plate.

In order to ensure the reliability of the battery operation, the connection part of the connecting piece 6 and the tab group 100 is coated with high-temperature gummed paper 7. It can be appreciated that the arrangement of the high-temperature gummed paper 7 can avoid the influence of the heating at the connection part (welding part) between the connecting piece 6 and the tab group 100 on the winding core.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A battery cover plate, comprising:

the cover plate body (1) is vertically provided with a pole hole (11);

the pole column (2) is penetrated through the pole column hole (11), a countersunk head hole (21) is penetrated through the pole column (2), the countersunk head of the countersunk head hole (21) is positioned on the upper side of the pole column (2), and the countersunk head hole (21) is used for the pole lug group (100) to extend in; and

and the welding piece (3), the tab group (100) and the pole post (2) are welded into a whole through the welding piece (3), and the counter bore (21) is sealed.

2. A battery cover plate according to claim 1, further comprising a connecting member (6), wherein one end of the connecting member (6) is welded to the tab group (100), and the other end passes through the counter bore (21) and is welded to the pole (2) integrally by the welding member (3).

3. A battery cover plate according to claim 2, characterized in that the connection of the connecting piece (6) and the tab group (100) is covered with a high temperature adhesive paper (7).

4. A battery cover plate according to claim 1, characterized in that the welding element (3) is an aluminum sheet, which fills the counter bore (21) to achieve sealing of the counter bore (21).

5. The battery cover plate according to claim 1, further comprising an upper plastic (4) and a lower plastic (5), wherein the upper plastic (4) and the lower plastic (5) are respectively disposed on the upper side and the lower side of the cover plate body (1), and the pole hole (11) penetrates through the cover plate body (1), the upper plastic (4) and the lower plastic (5) at the same time.

6. A battery cover according to claim 1, wherein the cover body (1) further comprises:

explosion-proof valve, explosion-proof hole (12) have been seted up on apron body (1), be provided with in explosion-proof hole (12) explosion-proof valve.

7. A battery cover according to claim 6, wherein the cover body (1) further comprises:

a bursting disc for blocking the bursting hole (12);

and the weak part is arranged on the explosion-proof sheet and used for breaking the explosion-proof sheet so as to allow the gas exhausted by the explosion-proof valve to pass through.

8. A battery cover according to claim 1, wherein the tab group (100) is folded over and connected to the bottom wall of the counter-sunk hole (21).

9. The battery cover plate according to claim 1, wherein the cover plate body (1) is provided with a liquid injection hole (13), the liquid injection hole (13) is used for injecting electrolyte, and a sealing plug is arranged in the liquid injection hole and used for sealing the liquid injection hole (13).

10. A battery comprising a housing, a winding core and a battery cover according to any one of claims 1-9, the housing having an opening, the winding core being mounted in the housing, the battery cover sealing the opening.