CN216793926U

CN216793926U - Battery and battery pack

Info

Publication number: CN216793926U
Application number: CN202220385726.1U
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 cell, a battery shell and a battery cover, wherein the battery cell is arranged in the battery shell and comprises a battery cell main body and a lug, and one side of the lug, which faces the battery shell, is provided with a groove; the groove forms an air storage space, and at least part of the vertical projection of the air storage space on the battery shell is intersected with the explosion-proof valve. When the battery provided by the application is applied, the gas generated in the battery can be stored in the gas storage space, and the gas can act on the corresponding explosion-proof valve. It is worth noting that the explosion-proof valve can burst after the gas in the gas storage space reaches a certain pressure, so as to ensure the safety performance of the battery. The battery forms the gas storage space through the grooves of the lugs, the gas storage space of the explosion-proof valve does not need to be arranged on the shell member independently, the preparation process can be simplified, and meanwhile, the gas storage space arranged in the battery core can enable the explosion-proof valve to normally exert the explosion-proof function, so that the safety performance of the battery can be ensured.

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

Pure electric vehicles are emerging as a new energy vehicle, and the power source of the traditional vehicle is changed from fuel oil to batteries. For the battery, its stability is of great concern.

In the related art, an explosion-proof valve needs to be provided in the battery to ensure the safety performance of the battery, and in the related art, a space for the explosion-proof valve to burst is generally separately provided on the cover plate. It is worth noting that the explosion-proof valve is separately arranged on the cover plate, so that the complexity of the whole process for preparing the cover plate is greatly improved.

Therefore, how to prepare a battery with simple process and capable of normally playing the function of an explosion-proof valve is a technical problem which needs to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery and a battery pack, which are convenient for smooth explosion of an explosion-proof valve on the premise of simplifying a preparation process.

In order to achieve the purpose, the utility model provides the following technical scheme:

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 cell, a battery shell and a battery cover, wherein the battery cell is arranged in the battery shell and comprises a battery cell main body and a lug, and one side of the lug, which faces the battery shell, is provided with a groove; the groove forms an air storage space, and at least part of the vertical projection of the air storage space on the battery shell is intersected with the explosion-proof valve.

The battery that this application provided includes battery case and electric core, and it is internal that battery case is arranged in to electric core, and the utmost point ear of electric core is equipped with the gas storage space, and this gas storage space's at least part corresponds explosion-proof valve. When the battery provided by the application is applied, the gas generated in the battery can be stored in the gas storage space, and the gas can act on the corresponding explosion-proof valve. It is worth noting that the explosion-proof valve can burst after the gas in the gas storage space reaches a certain pressure, so as to ensure the safety performance of the battery.

The battery provided by the application forms the gas storage space through the grooves of the tabs, and the gas storage space of the explosion-proof valve is not required to be arranged on the shell member independently, so that the preparation process can be simplified. Meanwhile, the gas storage space arranged in the battery core can enable the explosion-proof valve to normally exert the explosion-proof function, so that the safety performance of the battery can be ensured.

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

The battery pack provided by the application forms the gas storage space through the groove of the lug, so that the gas storage space of the explosion-proof valve does not need to be separately arranged on the shell member, and the preparation process can be simplified. Meanwhile, the gas storage space arranged in the battery core can enable the explosion-proof valve to normally exert the explosion-proof function, so that the safety performance of the battery can be ensured.

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 partial cross-sectional view of a battery provided in an embodiment of the present application;

fig. 2 is a schematic partial perspective view of a battery according to an embodiment of the present disclosure;

fig. 3 is a second partial cross-sectional view of a battery provided in accordance with an embodiment of the present application;

fig. 4 is a schematic partial perspective view of a battery according to an embodiment of the present disclosure;

fig. 5 is a third partial cross-sectional view of a battery provided in an embodiment of the present application.

The reference numerals are illustrated below:

10-a battery case; 11-an explosion-proof valve; 111-a weakening; 12-a shell part; 13-a cover plate; 20-electric core; 21-a cell body; 22-a tab; 221-grooves; 30-a collector tray; 31-vent through hole.

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 by those skilled in the art as the case may be.

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.

Fig. 1 is a partial cross-sectional view of a battery provided in an embodiment of the present application. Fig. 2 is a perspective view of the structure corresponding to fig. 1. As shown in fig. 1 and 2, the present embodiment provides a battery, including:

the battery shell 10, the battery shell 10 has explosion-proof valves 11;

the battery cell 20 is arranged in the battery shell 10, the battery cell 20 includes a battery cell main body 21 and a tab 22, a groove 221 is formed on one side of the tab 22 facing the battery shell 10, the groove 221 forms a gas storage space, and at least a part of the gas storage space in a vertical projection of the battery shell 10 intersects with the explosion-proof valve 11.

It should be understood that the cell main body 21 and the tab 22, and the tab 22 and the groove 221 are schematically separated by a dotted line in fig. 1 for clarity of representation of the positional relationship.

When the battery provided by the embodiment of the application is applied, the gas generated inside the battery can be stored in the gas storage space, and the gas can act on the corresponding explosion-proof valve 11. It should be noted that the explosion-proof valve 11 will burst after the gas in the gas storage space reaches a certain pressure, so as to ensure the safety performance of the battery.

It should be noted that, in the battery provided in the embodiment of the present application, the air storage space is formed by the grooves 221 of the tabs 22, and it is not necessary to separately provide the air storage space of the explosion-proof valve 11 on the case member 12, which can simplify the manufacturing process. Meanwhile, the gas storage space of the battery cell 20 enables the explosion-proof valve 11 to normally perform an explosion-proof function, so that the safety performance of the battery can be ensured.

It should be understood that the cell body 21 may be formed by winding, or may be stacked and prepared by a lamination process. When the electric core main body 21 is formed by winding, the electric core main body 21 is also called a winding core body, and the winding core body may be a cylinder shape matching the shape of the casing member 12 shown in fig. 2, and may also be a square column shape, which is not described herein again. In forming the core body, a support member is typically employed as an internal support member for the winding structure. Illustratively, taking the support member as a cylindrical shape as an example, the specific process of forming the winding core is as follows: forming a roll core around the support member with a tape; after the core is formed, the support member inside the core is withdrawn.

In addition, it should be noted that the material belt is formed by a diaphragm and a pole piece, wherein the pole piece specifically includes a first pole piece and a second pole piece separated by the diaphragm, and the first pole piece and the second pole piece are located on two sides of the diaphragm. When the first pole piece is positive, the second pole piece is negative. And the polarities of the first pole piece and the second pole piece can be interchanged. It is worth noting that the first pole piece is connected with the pole column, or the second pole piece is connected with the pole column.

It is noted that the grooves 221 of the tab 22 may be formed by kneading the tab 22, and may also be formed by cutting the tab 22.

In one embodiment, the grooves 221 on the tab 22 are formed by cutting.

Specifically, the portion of the tab 22 corresponding to the bottom of the groove 221 may be cut off by a certain length, so that the tab 22 is matched with each portion to form a groove 221 structure, the bottom and the side wall of the groove 221 may be a plane, a concave-convex surface or an inclined surface, and may be specifically set as required, which is not described herein again.

It is noted that there are various methods of forming the grooves 221 by cutting the tab 22. In one possible implementation: before winding to form a winding core body, the tab 22 corresponding to the bottom of the groove 221 is cut to a certain size. After the winding operation is completed, the tab 22 of the cut-off portion forms the bottom of the groove 221, and the tab 22 of the uncut portion forms the sidewall of the groove 221. It is worth noting that the method can simplify the preparation process of the battery provided by the embodiment of the application, so that the production efficiency can be improved. In another possible implementation: the cell main body 21 is formed by winding, and then the tab 22 corresponding to the groove 221 is cut off.

In one embodiment, the portion of the tab 22 corresponding to the groove 221 is completely cut away along the direction of the cell main body 21 pointing to the tab 22, so as to increase the air storage space.

In another embodiment, the minimum dimension of the portion of the tab 22 corresponding to the groove 221 along the direction of the cell main body 21 pointing to the tab 22 is 1mm to 3 mm. Illustratively, it may be chosen from any of the following values: 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0 mm.

It should be noted that, the battery case 10 provided in the embodiment of the present application is provided with a terminal post, and the terminal post is at least partially disposed inside the battery case 10. When the minimum value of the size of the tab 22 corresponding to the bottom of the groove 221 is 1 mm-3 mm, the side wall and the bottom of the groove 221 are both formed by the tab 22, and the pole arranged in the groove 221 can be directly and electrically connected with the tab 22. In other words, when the tab 22 corresponding to the bottom of the groove 221 is not cut to the bottom, the flow area between the tab 22 and the terminal can be increased, and thus the overall flow capacity of the battery can be ensured.

In the specific configuration of the explosion-proof valve 11, in a possible embodiment, the explosion-proof valve 11 may be provided as an integral structure with the battery case 10. Specifically, a weak region may be provided at the battery case 10 to form the explosion-proof valve 11. Illustratively, the battery case 10 may be formed by combining a thin plate with a thick plate, wherein the position of the thin plate corresponds to the position of the explosion-proof valve 11. In another possible embodiment, a separate explosion-proof valve 11 may be fixed to the battery case 10.

In one embodiment, continuing to refer to the structure illustrated in fig. 1 and 2, the explosion proof valve 11 has a weakened portion 111. When the gas in the gas storage space acts on the explosion-proof valve 11, the weakening portion 111 is cracked by the gas to exert the explosion-proof effect.

For example, with continued reference to the structure shown in fig. 1 and 2, the weakened portion 111 is a notch provided on the side of the battery case 10 facing away from the battery cell 20. Specifically, the battery case 10 at the notch is weak, and when the gas in the gas storage space reaches a certain pressure, the gas acts on the notch, so that the explosion-proof valve 11 is burst from the notch. It is understood that the battery case 10 in the score surrounding area is peeled off when the explosion-proof valve 11 is exploded.

It should be understood that the score as shown in fig. 1 and 2 is a continuous structure, and the continuous score can ensure that the explosion-proof valve 11 can be normally opened when the pressure in the gas storage space acts on all parts of the weakening portion 111, so as to improve the safety performance and ensure that the gas can be effectively discharged when the gas is generated inside the battery. Of course, the nicks can also be formed by a multi-section discontinuous structure, and can be specifically arranged according to requirements, which is not described herein again.

In one embodiment, the end surface of the battery cell 20 facing the battery case 10 has a central region, and the weakened portion 111 surrounds at least a portion of the central region.

It should be understood that the "central region" refers to a partial region located relatively in the center of one side end surface of the battery cell 20, and the central region may be a circular region or a continuous region with another shape. When the weakened portion 111 is a continuous annular structure, the weakened portion 111 completely surrounds the central region; when the weakened portion 111 is non-annular or ring-like in configuration, the weakened portion 111 surrounds at least a portion of the central region.

In order to further increase the air storage space, in a specific embodiment, please continue to refer to the structure shown in fig. 1 and fig. 2, there may be provided: the portions of the tabs 22 located in the central region are not in contact with the battery case 10.

Illustratively, the uncut portion (i.e., the portion located in the central region) of the tab 22 located in the space surrounded by the groove 221, which is separated by the dotted line in fig. 1, may be cut to a certain length to prevent the tab 22 from contacting the battery case 10. It should be noted that, this structural arrangement can further increase the gas storage space, and simultaneously, can increase the area of conducting annular groove 221 and inside utmost point ear 22 for the indent department atress of explosion-proof valve 11 is even, in order to further promote the security performance of the battery that this application embodiment provided.

It is noted that the portions of the tabs 22 outside the central region may be in contact with the battery case 10. The manner of contact is illustratively direct contact or welding.

In one embodiment, the weakened portion 111 is located at the bottom wall of the groove 221 in the vertical projection of the tab 22. Illustratively, as shown in fig. 1, the bottom wall of the groove 221 refers to a surface of the groove 221 facing the explosion-proof valve 11.

It should be noted that, when the weakening portion 111 completely faces the groove 221, the acting area of the gas in the gas storage space and the weakening portion 111 can be increased to ensure that the weakening portion 111 acts. In another specific embodiment, as shown in fig. 3 and 4, the battery provided in the embodiment of the present application further includes a current collecting plate 30, the current collecting plate 30 is disposed between the tab 22 and the battery case 10, and the current collecting plate 30 is provided with a vent hole 31 at a position corresponding to the weakening portion 111 in a vertical projection of the battery case 10, where the vent hole 31 is communicated with the air storage space.

The cell main body 21 is electrically connected to the current collecting plate 30 via the tab 22. It should be understood that since the current collecting disc 30 has a large area, the connection area of the tab 22 to the battery case 10 can be increased by providing the current collecting disc 30 to increase the current capacity.

When the exhaust through holes 31 on the collecting plate 30 are provided, the collecting plate 30 may be provided with at least one or more exhaust through holes 31. In one embodiment, when at least two exhaust through holes 31 are provided on the collecting plate 30, the at least two exhaust through holes 31 are spaced apart from each other along the weakened portion 111 in a vertical projection of the collecting plate 30. Illustratively, two, three, four, five, six, or more exhaust through holes 31 may be provided on the collecting plate 30, wherein each exhaust through hole 31 may be provided at intervals along the vertical projection of the weakened portion 111 on the collecting plate 30. For example, when the weakening part 111 has a ring shape, a vertical projection of the weakening part 111 on the collecting plate 30 also has a ring shape, and the plurality of exhaust through holes 31 may be arranged at intervals along the projection of the ring shape. Of course, the interval setting may be uniform interval setting or non-uniform interval setting, and may be specifically set according to requirements, which is not described herein again.

When the shape of the exhaust through hole 31 is set, the exhaust through hole 31 may be a waist-shaped hole, a circular hole or a polygonal hole extending along the annular projection, and may be specifically set as required, which is not described herein again. When the size of the exhaust through holes 31 is set, the exhaust through holes 31 on the collecting plate 30 may be set to be larger-diameter through holes, and each exhaust through hole 31 may be formed by a plurality of small holes. Even more, in one embodiment, only one air-permeable through-hole with a large aperture may be provided in the current collecting plate 30. Specifically, the portions of the current collecting disk 30 that are located in the central region within the vertical projection of the current collecting disk 30 are all removed.

In one embodiment, with continued reference to the structure shown in fig. 3, the portion of the current collecting plate 30 in the vertical projection of the battery case 10 in the central region within the battery case 10 is not rigidly connected to the battery case 10. It is understood that the non-strongly fixed connection means: when the explosion-proof valve 11 bursts, the collecting plate 30 and the battery case 10 can be smoothly disconnected. In one possible embodiment, only contact is made between the current collecting plate 30 and the battery case 10, but no other connecting structure is provided therebetween; in another possible embodiment, the current collecting plate 30 and the battery case 10 are connected only by means of adhesive or the like with a low bonding strength.

It should be noted that, since the portion of the current collecting plate 30 corresponding to the central region is only connected to the battery case 10 in a non-rigid manner, when the gas in the gas storage space acts on the explosion-proof valve 11 through the gas exhaust through hole 31, the explosion-proof valve 11 can be normally exploded under the action of the gas, so as to ensure the safety performance of the battery.

It is noted that a portion of the current collecting plate 30, which is located outside the vertical projection of the central region of the battery case 10, may be in contact with the battery case 10. The manner of contact is illustratively direct contact or welding. The tab 22 and the current collecting plate 30 may be connected by direct contact, conductive adhesive bonding, or welding.

It should be noted that in this embodiment, the collecting disc 30 and the shell member 12 are in contact at both positions within and outside the corresponding central region, so that the contact area between the collecting disc 30 and the shell member 12 is large, and the flow capacity can be improved.

In another embodiment, referring to the structure shown in fig. 5, the portion of the current collecting plate 30 that is within the vertical projection of the cell housing 10 in the central region does not contact the cell housing 10. Illustratively, the cell housing 10 forms an escape space, and the collecting plate 30 does not contact the cell housing 10 at least in a portion located within a vertical projection of the central region.

It should be noted that, since the portion of the current collecting plate 30 located in the vertical projection of the central region is not in contact with the battery case 10, when the gas in the gas storage space acts on the explosion-proof valve 11 through the gas exhaust through hole 31, the explosion-proof valve 11 can be exploded and normally exploded under the action of the gas, and the safety performance of the battery can be further improved.

In one embodiment, the battery case 10 includes a case member 12 and a cover plate 13, and the cover plate 13 is connected to the case member 12 to seal the battery cell 20.

It should be noted that the sealing connection between the case member 12 and the cover plate 13 can prevent the electrolyte injected into the battery case 10 from overflowing, so as to improve the safety performance of the battery.

In one embodiment, the battery provided by the embodiment of the present application is a cylindrical battery. Specifically, the housing member 12 may be a cylindrical structure, and the housing member 12 includes an annular side plate and a bottom plate, the bottom plate seals one end of the annular side plate, and the cover plate 13 seals the other end opening of the annular side plate. In one possible embodiment, the shell member 12 is of one-piece construction.

It should be noted that when the housing member 12 is a one-piece molded structure, the manufacturing process can be simplified. When the case member 12 provided in the embodiment of the present application is applied, the battery cell 20 may be extended into the case member 12 from the opening side, so as to complete the operation of inserting the battery cell 20 into the case.

In one embodiment, the explosion-proof valve 11 is provided in the cover plate 13. Alternatively, it may be provided at the bottom of the shell member 12.

In a second aspect, an embodiment of the present application provides a battery pack, including any one of the batteries provided in the above technical solutions.

The battery pack provided by the embodiment of the application has the advantages that the gas storage space in the battery is formed in the battery cell 20, the gas storage space of the explosion-proof valve 11 does not need to be independently arranged on the shell member 12, the preparation process can be simplified, and meanwhile, the gas storage space arranged in the battery cell 20 can enable the explosion-proof valve 11 to normally exert an explosion-proof function, so that the safety performance of the battery can be ensured.

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 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 the battery shell (10) is provided with an explosion-proof valve (11);

the battery comprises a battery cell (20), wherein the battery cell (20) is arranged in the battery shell (10), the battery cell (20) comprises a battery cell main body (21) and a lug (22), and a groove (221) is formed in one side, facing the battery shell (10), of the lug (22); the groove (221) forms a gas storage space, and at least part of the vertical projection of the gas storage space on the battery shell (10) is intersected with the explosion-proof valve (11).

2. The battery according to claim 1, wherein the tabs (22) are cut to form the grooves (221).

3. The battery according to claim 1 or 2, wherein the minimum dimension of the part of the tab (22) corresponding to the groove (221) is 1mm to 3mm in the direction in which the cell main body (21) points to the tab (22).

4. The battery according to claim 1 or 2, characterized in that the explosion-proof valve (11) has a weakened portion (111).

5. The battery according to claim 4, wherein the weakened portion is a notch provided on a side of the battery case (10) facing away from the battery cell (20).

6. The battery according to claim 5, characterized in that the end face of the cell (20) facing the battery housing (10) has a central region, the weakened portion (111) surrounding at least part of the central region.

7. The battery according to claim 6, characterized in that the perpendicular projection of the weakened portion (111) at the tab (22) is located at the bottom wall of the groove (221).

8. The battery according to claim 7, wherein the portion of the tab (22) located in the central region is free of contact with the battery case (10).

9. The battery according to claim 7, further comprising a current collecting disc (30), wherein the current collecting disc (30) is disposed between the tab (22) and the battery case (10), and the current collecting disc (30) is provided with an air exhaust through hole (31) at a position of a vertical projection of the battery case (10) corresponding to the weakening portion (111), and the air exhaust through hole (31) is communicated with the air storage space.

10. The battery according to claim 9, characterized in that the portion of the collecting disk (30) in the vertical projection of the battery housing (10) in the central region within the battery housing (10) is connected to the battery housing (10) in a non-positive manner.

11. The cell according to claim 9, characterized in that the portion of the collecting disk (30) in the vertical projection of the cell housing (10) in the central region within the cell housing (10) is free from contact with the cell housing (10).

12. The battery according to claim 1 or 2, wherein the battery is a cylindrical battery.

13. A battery comprising a cell according to any one of claims 1 to 12.