CN216793951U

CN216793951U - Battery and battery pack

Info

Publication number: CN216793951U
Application number: CN202220383086.0U
Authority: CN
Inventors: 孙倩倩; 张璐璐
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-06-21
Anticipated expiration: 2032-02-24

Abstract

The utility model relates to the technical field of batteries and provides a battery and a battery pack. The battery includes: the battery shell is provided with an explosion-proof valve; the battery comprises a battery core, the battery core is arranged in a battery shell and comprises a first tab, the first tab is electrically connected with the battery shell, and after the explosion-proof valve is opened, the first tab is electrically disconnected with the battery shell. The first tab of the battery core is electrically connected with the battery shell, and after the explosion-proof valve is opened, the charging or discharging of the battery is disconnected, so that the charging or discharging of the battery is disconnected in the pressure relief process of the battery, the heat generation is stopped, and the safety performance of the battery is improved.

Description

Battery and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery and a battery pack.

Background

In the related art, when the internal pressure of the battery is too high, the explosion-proof valve can be broken to realize pressure relief, so that the safety problem is avoided.

However, in the prior art, even if the pressure relief is realized by the explosion-proof valve, the battery is still in a connected state, so that the problem of a large amount of heat generation also occurs.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery and a battery pack, which are used for improving the performance of the battery.

According to a first aspect of the present invention, there is provided a battery comprising:

the battery shell is provided with an explosion-proof valve;

the battery comprises a battery core, wherein the battery core is arranged in a battery shell and comprises a first tab, the first tab is electrically connected with the battery shell, and the first tab is electrically disconnected with the battery shell after the explosion-proof valve is opened.

The battery comprises a battery shell and a battery core, wherein the battery core is arranged in the battery shell, and an explosion-proof valve is arranged on the battery shell. The first tab of the battery core is electrically connected with the battery shell, and after the explosion-proof valve is opened, the charging or discharging of the battery is disconnected, so that the charging or discharging of the battery is disconnected in the pressure relief process of the battery, the heat generation is stopped, and the safety performance of the battery is improved.

According to a second aspect of the present invention, there is provided a battery pack comprising the above battery.

The battery pack comprises a battery, wherein the battery comprises a battery shell and a battery cell, the battery cell is arranged in the battery shell, and an explosion-proof valve is arranged on the battery shell. The first tab of the battery core is electrically connected with the battery shell, and after the explosion-proof valve is opened, the charging or discharging of the battery is disconnected, so that the charging or discharging of the battery is disconnected in the pressure relief process of the battery, the heat generation is stopped, and the safety performance of the battery pack is improved.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

FIG. 1 is a schematic diagram of a battery shown in accordance with an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating a cross-sectional configuration of a battery according to an exemplary embodiment;

fig. 3 is a schematic diagram illustrating a partial cross-sectional structure of a battery according to an exemplary embodiment.

The reference numerals are illustrated below:

10. a battery case; 11. an explosion-proof valve; 12. a weakened area; 13. a housing member; 14. a cover plate; 20. an electric core; 21. a first tab; 211. recessing; 22. a second tab; 30. a pole column; 40. a collector plate.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood as a specific case by a person skilled in the art.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a battery, please refer to fig. 1 to fig. 3, the battery includes: the battery comprises a battery shell 10, wherein an explosion-proof valve 11 is arranged on the battery shell 10; the battery cell 20 is disposed in the battery case 10, the battery cell 20 includes a first tab 21, the first tab 21 is electrically connected to the battery case 10, and after the explosion-proof valve 11 is opened, the first tab 21 is electrically disconnected from the battery case 10, so that charging or discharging of the battery is interrupted.

The battery of one embodiment of the utility model comprises a battery shell 10 and a battery core 20, wherein the battery core 20 is arranged in the battery shell 10, and an explosion-proof valve 11 is arranged on the battery shell 10. The first tab 21 of the battery cell 20 is electrically connected to the battery case 10, and after the explosion-proof valve 11 is opened, the charging or discharging of the battery is disconnected, so that the charging or discharging of the battery is disconnected during the pressure relief of the battery, thereby stopping the heat generation, and improving the safety performance of the battery.

It should be noted that, during the charging or discharging process of the battery, since the first tab 21 of the battery cell 20 is electrically connected to the battery case 10, that is, the battery case 10 is used as a part of the circuit conduction, after the explosion-proof valve 11 is opened, the electrical connection between the first tab 21 and the battery case 10 is disconnected, and then the closed circuit of the battery is disconnected, so that the charging or discharging process of the battery is disconnected. In this embodiment, after the explosion-proof valve 11 is opened, the electrical connection between the first tab 21 and the battery case 10 is disconnected, so that the battery is disconnected during the pressure relief process, the heat generation is stopped, and the safety performance of the battery is improved.

It should be noted that, after the explosion-proof valve 11 is opened, the first tab 21 is electrically disconnected from the battery case 10, and the disconnected electrical connection is that the closed circuit of the battery is disconnected, so that a complete charging or discharging circuit cannot be formed, thereby stopping the operation of the battery. Further, the battery case 10 may serve as a lead-out terminal of the battery, which is opened after the explosion-proof valve 11 is opened, so that the entire closed circuit of the battery is opened.

Explosion-proof valve 11 opens and explodes for explosion-proof valve 11 under specific pressure, and battery internal pressure can be discharged through opening of explosion-proof valve 11 under reaching certain pressure, avoids causing further safety risk. The opening of the explosion-proof valve 11 includes the explosion-proof valve 11 being detached from the battery case 10, i.e., the explosion-proof valve 11 may be partially detached from the battery case 10, or the explosion-proof valve 11 may be completely detached from the battery case 10, or the explosion-proof valve 11 may be exploded by an intermediate area, thereby achieving the pressure relief. Here, the explosion-proof valve 11 is opened and the explosion-proof valve 11 is separated from the battery case 10, so that the explosion-proof valve 11 can release the internal pressure of the battery.

The battery case 10 is provided with the explosion-proof valve 11, that is, after the explosion-proof valve 11 is opened, the sealed space formed by the battery case 10 is released, so that the pressure relief inside the battery is realized, and the safety problem of the battery is avoided.

In some embodiments, as shown in fig. 1 and 2, the first tab 21 is connected to the battery case 10, and the explosion-proof valve 11 may be disposed around the first tab 21 so that the space released by the explosion-proof valve 11 divides the battery case 10 into two parts after the explosion-proof valve 11 is separated from the battery case 10, in which case, one part of the battery case 10 is a part connected to the first tab 21 and the other part of the battery case 10 is a part disconnected from the first tab 21, and if the other part of the battery case 10 is used as a charge and discharge outlet of the battery, charge and discharge of the battery are interrupted, so that the charge or discharge of the battery is interrupted after the explosion-proof valve 11 is separated from the battery case 10, thereby stopping heat generation.

In one embodiment, the first tab 21 is connected to the explosion-proof valve 11 and electrically connected to the battery case 10 through the explosion-proof valve 11, so that when the explosion-proof valve 11 is separated from the battery case 10, the electrical connection between the first tab 21 and the battery case 10 is disconnected, and the charge and discharge of the battery are disconnected, so that when the explosion-proof valve 11 is separated from the battery case 10, the charge or discharge of the battery is disconnected, thereby stopping the heat generation.

In one embodiment, the battery case 10 and the explosion-proof valve 11 are formed separately, that is, after the battery case 10 and the explosion-proof valve 11 are formed separately, the explosion-proof valve 11 is connected to the battery case 10 to block the pressure relief opening of the battery case 10, and after the explosion-proof valve 11 is separated from the battery case 10, the pressure relief opening is released to relieve the pressure of the battery.

The explosion proof valve 11 may be welded to the battery case 10, or the explosion proof valve 11 may be bonded to the battery case 10. The explosion-proof valve 11 may be separated from the battery case 10 when the internal pressure or temperature of the battery reaches a certain level, at which time the explosion-proof valve 11 may be separated from the battery case 10 as a whole, or the explosion-proof valve 11 may be partially separated from the battery case 10. The specific structure of the explosion-proof valve 11 is not limited herein, and may be an explosion-proof structure in the related art, such as an explosion-proof membrane or the like.

It is to be noted that when the explosion-proof valve 11 is entirely detached from the battery case 10, the charge or discharge of the battery is interrupted. When a part of the explosion-proof valve 11 is separated from the battery case 10, the charging or discharging of the battery can be disconnected by adjusting the structural design, for example, a part of the explosion-proof valve 11 is electrically connected with the battery case 10, and a part of the explosion-proof valve is connected in an insulating manner, and the electrically connected part can be relatively weak compared with the insulating part, so that when the battery is decompressed, the electrically connected part can be more easily disconnected, and thus the electrical connection between the first tab 21 and the battery case 10 can be disconnected.

In one embodiment, the explosion-proof valve 11 is disposed in the middle of the battery case 10, and the first tab 21 is in direct contact with the explosion-proof valve 11 and is spaced apart from the battery case 10, so that the end of the first tab 21 close to the explosion-proof valve 11 is located in the explosion-proof valve 11, thereby preventing the first tab 21 from contacting the battery case 10, and thus ensuring that the first tab 21 is reliably electrically disconnected from the battery case 10 after the explosion-proof valve 11 is opened.

The explosion-proof valve 11 is disposed at the middle of the battery case 10, i.e., a portion of the battery case 10 is disposed around the explosion-proof valve 11.

In one embodiment, the explosion-proof valve 11 is circular, which not only facilitates the connection with the first tab 21, but also has a relatively simple structure, which is beneficial to improving the molding efficiency of the battery.

The battery can be a cylindrical battery, the first tab 21 can be substantially a torus and can be reliably connected with the circular explosion-proof valve 11, at this time, the end portions of the first tab 21 close to the explosion-proof valve 11 are all located in the explosion-proof valve 11, that is, the orthographic projection of the first tab 21 toward the explosion-proof valve 11 is all located in the explosion-proof valve 11, and a certain gap can be formed between the first tab 21 and the portion of the battery case 10 surrounding the explosion-proof valve 11, so as to avoid direct contact or indirect contact between the first tab 21 and the battery case 10.

In one embodiment, a part of the battery case 10 and the explosion-proof valve 11 are integrally formed, which not only improves the forming efficiency of the structure, but also ensures the strength of the structure.

In some embodiments, as shown in fig. 1 to 3, the junction of the battery case 10 and the explosion-proof valve 11 includes a weakened area 12, so that the battery case 10 and the explosion-proof valve 11 can be reliably separated, thereby ensuring that the battery has a reliable pressure relief capacity.

A part of the battery case 10 and the explosion-proof valve 11 are integrally formed, that is, the explosion-proof valve 11 also belongs to a part of the battery case 10, and the embodiment divides the two in terms of structural form, for example, the connection between the battery case 10 and the explosion-proof valve 11 includes a weakened area 12, while the area inside the weakened area 12 may be the explosion-proof valve 11, and the area outside the weakened area 12 may be the battery case 10. Of course, the area inside the weakened area 12 may also be a part of the battery case 10, and the area outside the weakened area 12 may include other parts of the battery case 10 and the explosion-proof valve 11. In this embodiment, it is emphasized that the explosion-proof valve 11 can be detached from the battery case 10 and the charge or discharge of the battery can be disconnected.

In one embodiment, the weakened area 12 includes a score, such that after the internal pressure of the battery reaches a certain preset value, the weakened area 12 can be burst, such that the explosion-proof valve 11 is opened. And when the battery current is great, weakened area 12 also can realize the disconnection to the charging or the discharging of disconnection battery, so as to avoid causing the safety problem, weakened area 12 can be used as the fusing portion, improves the safety protection performance of battery.

In some embodiments, the weakened region 12 may include a thinned region, i.e., the thickness of the weakened region 12 may be smaller than the thickness of the battery case 10, and the thickness of the weakened region 12 may be smaller than the thickness of the explosion-proof valve 11.

It should be noted that the weakened area 12 may also be a weakened area, that is, the strength of the weakened area 12 is relatively low by controlling the material properties, so that after the internal pressure of the battery reaches a certain preset value, the weakened area 12 can be burst, so that the explosion-proof valve 11 is opened.

In one embodiment, the explosion-proof valve 11 may be an aluminum plate, a copper plate, a nickel plate, a steel plate, or the like.

In one embodiment, as shown in fig. 1 and 2, the battery case 10 includes: a housing member 13; a cover plate 14, wherein the cover plate 14 is connected with the housing part 13 to seal the battery cell 20; wherein, the cover plate 14 is provided with an explosion-proof valve 11. The housing part 13 comprises an open end, and the cover 14 seals the open end, thereby sealing the cell 20. The housing member 13 and the cover plate 14 may be connected by welding, riveting, or the like. Housing member 13 and cover plate 14 may be laser welded, or housing member 13 and cover plate 14 may be ultrasonically welded, or housing member 13 and cover plate 14 may be resistance welded.

In some embodiments, the cover plate 14 and the housing member 13 can be connected in an insulating manner, in which case, the cover plate 14 can be used as a connection terminal for charging or discharging the battery, and after the explosion-proof valve 11 is separated from the cover plate 14, it is necessary to ensure that the electrical connection of the cover plate 14 and the first tab 21 is disconnected, so that the charging or discharging of the battery can be ensured.

In some embodiments, the cover plate 14 and the housing member 13 may be electrically connected, in which case the cover plate 14 may serve as a connection terminal for charging or discharging the battery, and after the explosion-proof valve 11 is separated from the cover plate 14, it is necessary to ensure that the electrical connection of the cover plate 14 and the first tab 21 is disconnected, so that the charging or discharging of the battery is disconnected. Alternatively, the housing member 13 may serve as a connection terminal for charging or discharging the battery, and after the explosion-proof valve 11 is separated from the cover plate 14, it is necessary to ensure that the housing member 13 is electrically disconnected from the first tab 21, so that it is ensured that the charging or discharging of the battery is disconnected.

In one embodiment, the cover plate 14 is a steel plate, an aluminum plate, a copper plate or a nickel plate, and on the basis of ensuring the structural strength, when the cover plate 14 is integrally formed with the explosion-proof valve 11, the steel plate, the aluminum plate, the copper plate or the nickel plate can also be used as the explosion-proof valve 11.

In some embodiments, housing piece 13 may include a main portion and a cover portion, which may be separate structures, which may be similar in structure to cover plate 14, and which may be disposed opposite cover plate 14. The body portion and the cover portion may be welded or otherwise connected.

In some embodiments, the housing member 13 is an integrally formed structure, which is not only simple to manufacture, but also relatively high in manufacturing efficiency, and can ensure reliable sealing performance.

In some embodiments, it is not excluded that the explosion-proof valve 11 is provided to the housing member 13.

In one embodiment, as shown in fig. 2, the battery cell 20 further includes a second tab 22, and the battery further includes a terminal post 30, wherein the terminal post 30 is disposed on the housing member 13 in an insulated manner and electrically connected to the second tab 22, so that the terminal post 30 serves as one electrical connection end of the battery and the battery housing 10 serves as the other electrical connection end.

The post 30 may be in direct electrical connection with the second pole ear 22. Alternatively, the pole post 30 may be electrically connected to the second pole ear 22 by a current collecting plate 40, as shown in FIG. 2. The second tab 22 may be provided with a conductive adhesive to increase the reliable electrical connection of the second tab 22 to the post 30 or to increase the reliable electrical connection of the second tab 22 to the current collecting plate 40.

In some embodiments, the cover plate 14 and the housing member 13 can be electrically connected, and the terminal post 30 is insulated from the housing member 13, in which case the housing member 13 and the terminal post 30 can serve as two electrical connection terminals, and further, the housing member 13 and the terminal post 30 can serve as electrical connection terminals on the same side of the battery. Alternatively, the cover 14 and the post 30 serve as electrical connection terminals on both sides of the battery. And after the explosion-proof valve 11 is opened, the charging or discharging of the battery is cut off, so that the charging or discharging of the battery is cut off in the process of the pressure relief of the battery.

In some embodiments, the cover plate 14 and the housing member 13 may be disposed in an insulated manner, and the terminal post 30 is disposed in an insulated manner in the housing member 13, in which case the cover plate 14 and the terminal post 30 serve as electrical connection terminals on both sides of the battery.

In one embodiment, a recess 211 is formed at the outer circumference of the first tab 21 so as to ensure the first tab 21 to be coupled with the explosion proof valve 11. The first tab 21 may be cut to form a recess 211.

Note that the battery includes a cell and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stack including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein the polarities of the first electrode and the second electrode can be interchanged.

The battery case 10 may be a cylindrical structure. In some embodiments, it is not excluded that the battery case 10 may be a rectangular body structure.

An embodiment of the utility model also provides a battery pack comprising the battery.

The battery pack of one embodiment of the present invention includes a battery, and the battery includes a battery case 10 and a battery cell 20, wherein the battery cell 20 is disposed in the battery case 10, and an explosion-proof valve 11 is disposed on the battery case 10. The first tab 21 of the battery cell 20 is electrically connected to the battery case 10, and after the explosion-proof valve 11 is opened, the charging or discharging of the battery is cut off, so that the charging or discharging of the battery is cut off during the pressure relief of the battery, thereby stopping the heat generation, and improving the safety performance of the battery pack.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery can be square battery, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixing a plurality of batteries. The battery can be a cylindrical battery, and the battery module can further comprise a bracket, and the battery can be fixed on the bracket.

The battery pack includes a plurality of batteries and a case for fixing the plurality of batteries.

It should be noted that, the battery pack includes a plurality of batteries, and a plurality of batteries are disposed in the box body. Wherein, a plurality of batteries can form and install in the box behind the battery module. Or, a plurality of batteries can directly set up in the box, need not to carry out the group to a plurality of batteries promptly, utilizes the box to fix a plurality of batteries.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery, comprising:

the battery comprises a battery shell (10), wherein an explosion-proof valve (11) is arranged on the battery shell (10);

the battery comprises a battery core (20), wherein the battery core (20) is arranged in the battery shell (10), the battery core (20) comprises a first tab (21), the first tab (21) is electrically connected with the battery shell (10), and after the explosion-proof valve (11) is opened, the first tab (21) is electrically disconnected with the battery shell (10).

2. The battery according to claim 1, characterized in that the first tab (21) is connected to the explosion-proof valve (11) and is electrically connected to the battery case (10) through the explosion-proof valve (11).

3. The battery according to claim 2, wherein the explosion-proof valve (11) is arranged in the middle of the battery shell (10), and the first tab (21) is in direct contact with the explosion-proof valve (11) and is arranged at a distance from the battery shell (10) so that the ends of the first tab (21) close to the explosion-proof valve (11) are both located in the explosion-proof valve (11).

4. The battery according to claim 3, characterized in that the explosion-proof valve (11) is circular.

5. The battery according to any one of claims 1 to 3, characterized in that a portion of the battery case (10) is of an integrally formed structure with the explosion-proof valve (11);

wherein the connection of the battery housing (10) to the explosion-proof valve (11) comprises a weakened area (12).

6. The battery according to claim 5, wherein the weakened area (12) comprises a score.

7. The battery according to any one of claims 1 to 3, wherein the battery case (10) comprises:

a housing part (13);

a cover plate (14), wherein the cover plate (14) is connected with the housing part (13) to seal the battery core (20);

wherein the cover plate (14) is provided with the explosion-proof valve (11).

8. The battery according to claim 7, wherein the battery core (20) further comprises a second tab (22), and the battery further comprises a pole (30), and the pole (30) is insulated from the housing member (13) and electrically connected to the second tab (22).

9. The battery according to any one of claims 1 to 3, wherein the battery is a cylindrical battery.

10. A battery pack characterized by comprising the battery according to any one of claims 1 to 9.