CN216288854U

CN216288854U - Battery and battery pack

Info

Publication number: CN216288854U
Application number: CN202123050272.7U
Authority: CN
Inventors: 许久凌; 孙倩倩; 张璐璐
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2022-04-12
Anticipated expiration: 2031-12-07

Abstract

The utility model relates to the technical field of batteries and provides a battery and a battery pack. The battery includes: the battery comprises a battery cell, wherein the battery cell comprises a battery cell main body and a lug, the lug extends out of the battery cell main body, and the lug comprises at least two single-sheet lugs; the pressure welding piece is positioned on one side of the lug so as to compress at least two single lugs into the lug; wherein, the pressure welding piece is welded with the compressed tab thereof. Each single lug that will form utmost point ear compresses tightly through the pressure weldment to make the pressure weldment and the utmost point ear welding that compresses tightly, thereby avoid appearing the rosin joint problem between the single lug, with this connection stability who improves pressure weldment and utmost point ear, thereby improve the performance of battery.

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 technology, the tab is formed by ultrasonic pre-welding after a plurality of single tabs are collected, the tab is subsequently welded and connected with the adapter plate, and the tab is electrically connected with the pole after being welded with the pole through the adapter plate. The welding procedures are multiple, the welding cost is increased, the insufficient welding phenomenon easily occurs to the pole lug, and the connection quality of the pole lug and the pole column is influenced.

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 comprises a battery cell, wherein the battery cell comprises a battery cell main body and a lug, the lug extends out of the battery cell main body, and the lug comprises at least two single-sheet lugs;

the pressure welding piece is positioned on one side of the lug so as to compress at least two single lugs into the lug;

wherein, the pressure welding piece is welded with the compressed tab thereof.

The battery comprises a battery core and a pressure welding piece, wherein the battery core is electrically connected with the pressure welding piece. Each single lug that will form utmost point ear compresses tightly through the pressure weldment to make the pressure weldment and the utmost point ear welding that compresses tightly, thereby avoid appearing the rosin joint problem between the single lug, with this connection stability who improves pressure weldment and utmost point ear, thereby improve the performance of battery.

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 cell and a bonding part, and the battery cell is electrically connected with the bonding part. Each single lug that will form utmost point ear compresses tightly through the pressure weldment to make the pressure weldment and the utmost point ear welding that compresses tightly, thereby avoid appearing the rosin joint problem between the single lug, with this connection stability who improves pressure weldment and utmost point ear, thereby improve the performance of group battery.

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 illustrating a partial structure of a battery according to an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating the structure of a post of a battery according to an exemplary embodiment;

fig. 3 is a schematic diagram illustrating the construction of a tab and a bonding member of a battery according to an exemplary embodiment.

The reference numerals are explained below:

10. an electric core; 11. a cell main body; 12. a tab; 20. a pole column; 21. a boss portion; 30. pressing a welded part; 31. and (4) protruding.

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.

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 cell 10, wherein the battery cell 10 comprises a battery cell main body 11 and tabs 12, the tabs 12 extend out from the battery cell main body 11, and the tabs 12 comprise at least two single-piece tabs; the pressure welding piece 30 is positioned on one side of the tab 12, so that at least two single tabs are compressed into the tab 12; wherein the pressure welding piece 30 is welded with the pole lug 12 pressed by the pressure welding piece.

The battery according to one embodiment of the present invention includes a battery cell 10 and a bonding member 30, and the battery cell 10 and the bonding member 30 are electrically connected. Each single lug that will form utmost point ear 12 through pressure weldment 30 compresses tightly to make pressure weldment 30 and the utmost point ear 12 welding that compresses tightly, thereby avoid appearing the rosin joint problem between the single lug, with this connection stability that improves pressure weldment 30 and utmost point ear 12, thereby improve the performance of battery.

It should be noted that the tabs 12 include at least two single tabs, each of which may be a metal sheet, and each of which is a metal sheet, and each of which may be a part of the current collector, or may have other options, and is not specifically limited herein. The utmost point ear 12 that two at least monolithic utmost point ears formed before unprocessed, can have certain clearance between the monolithic utmost point ear, and this embodiment compresses tightly each monolithic utmost point ear through compression-welding piece 30, makes adjacent monolithic utmost point ear contact to when welding pressure-welding piece 30 and utmost point ear 12, can not because monolithic utmost point ear directly has the appearance that the clearance leads to bad problems of welding such as rosin joint.

Go to compress tightly each monolithic utmost point ear through pressure weldment 30, not only can guarantee the reliability that compresses tightly, and can save to compress tightly monolithic utmost point ear through other peripheral hardware parts, and will press weldment 30 to weld on utmost point ear 12, can further guarantee welded stability, increase welding strength, avoid haring utmost point ear 12.

The battery includes a cell 10 and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell 10 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 cell 10 is disposed within a battery housing.

In an embodiment, pressure welding piece 30 and utmost point ear 12 laser welding, utmost point ear 12 realizes the compaction through pressure welding piece 30, and utmost point ear 12 can have the unable compaction problem of comparatively serious when adopting laser welding, consequently, in this embodiment, can guarantee when pressure welding piece 30 and utmost point ear 12 laser welding through being provided with pressure welding piece 30 compaction utmost point ear 12, can not appear the clearance between the monolithic utmost point ear and avoid appearing poor welding such as rosin joint, and laser welding can guarantee the welding effect of pressure welding piece 30 and utmost point ear 12 again.

In certain embodiments, it is not excluded that the tab 12 is compacted by the bonding material 30 and then the bonding material 30 is joined to the tab 12 by ultrasonic welding or resistance welding.

It is to be noted that the battery may be provided with no terminal, or with only one terminal (positive terminal or negative terminal). The bonding material 30 may be located on the upper side or the lower side of the tab 12, and the battery cell 10 may be directly charged and discharged through at least one of the bonding material 30 and the tab 12. Alternatively, the pressure-welding members 30 and the tabs 12 may be electrically connected with the battery case, thereby achieving charge and discharge through the battery case. The present embodiment is described with respect to only one of the tabs 12, and it is necessary to ensure that the positive and negative tabs are not short-circuited.

In one embodiment, as shown in fig. 1, the battery further includes a pole 20, and the pole 20 is connected to the tab 12, so that the battery cell 10 can be charged and discharged through the pole 20. Pressure welding piece 30 can be located utmost point ear 12 and deviate from one side of utmost point post 20, and utmost point ear 12 of electric core main part 11 is located between pressure welding piece 30 and utmost point post 20, and each monolithic utmost point ear that will form utmost point ear 12 through pressure welding piece 30 compresses tightly to make pressure welding piece 30 and the utmost point ear 12 welding that compresses tightly, thereby avoid appearing the rosin joint problem between the monolithic utmost point ear, with this connection stability who improves pressure welding piece 30, utmost point ear 12 and utmost point post 20. The pole 20 may include two poles, one being a positive pole and the other being a negative pole.

In one embodiment, an adapter sheet may be disposed between the tab 12 and the pole 20, that is, the tab 12 and the pole 20 are connected through the adapter sheet. The pressure welding piece 30, the tab 12, the adapter plate and the pole 20 can be welded integrally, for example, the pressure welding piece 30, the tab 12, the adapter plate and the pole 20 can be welded integrally by laser welding. In some embodiments, it is not excluded that the bonding members 30 are welded to the tabs 12 first, and then to the tabs and the posts 20.

In one embodiment, the tab 12 is in direct contact with the post 20, i.e., no adaptor sheet may be disposed between the tab 12 and the post 20, thereby reducing the number of connection parts and simplifying the battery structure.

In one embodiment, the pressure welding member 30, the tab 12 and the pole 20 are integrally welded, which not only simplifies the connection process, but also reduces the problem of structural damage caused by multiple welding, thereby improving the welding quality.

In one embodiment, the pressure welding piece 30, the tab 12 and the pole 20 are welded by laser, the pressure welding piece 30 can compress the tab 12 on the pole 20, and then the pressure welding piece 30, the tab 12 and the pole 20 are welded by laser in an integrated manner, so that the welding quality is ensured, and the welding effect can be improved.

In some embodiments, the pressure welding member 30 may be welded to the tab 12 first, and then the tab 12 is welded to the post 20. For example, the pressure welding member 30 may perform a first welding with the tab 12 by laser welding, and then perform a second welding with the tab 12 and the post 20 by resistance welding, or perform a second welding with the tab 12 and the post 20 by laser welding.

In one embodiment, the hardness of the pressure welding piece 30 is greater than that of the tab 12, and the hardness of the pressure welding piece 30 is less than that of the pole 20, so that the hardness of the pressure welding piece 30 can be reduced properly on the basis of ensuring that the pressure welding piece 30 can reliably press the tab 12, thereby improving the welding effect and preventing the tab 12 from being crushed due to the excessive hardness of the pressure welding piece 30.

In one embodiment, as shown in fig. 2, a protruding portion 21 is disposed at one end of the pole post 20 facing the tab 12, and the provision of the protruding portion 21 can increase the flow area of the pole post 20, thereby avoiding the problem that the pole post 20 is thick and difficult to melt, and ensuring the connection stability between the pole post 20 and the tab 12.

In some embodiments, the protruding portion 21 may be used to compress the tab 12, considering that the tab 12 is formed by gathering a plurality of single tabs, and when each single tab is gathered, the middle single tab may be longer than other single tabs because it does not need to be gathered upward or downward, that is, one side of the tab 12 away from the cell main body 11 may have a relatively thin problem, at this time, the protruding portion 21 provided on the post 20 may contact with a relatively thin portion of the tab 12, so as to ensure reliable contact between the tab 12 and the post 20, and ensure subsequent welding reliability.

In one embodiment, the number of the protruding portions 21 is at least two, that is, a plurality of protruding portions 21 are distributed on the pole 20 at intervals and contact with the tab 12, so as to increase the flow area of the pole 20 and avoid the pole 20 being thicker and less prone to melting. In this embodiment, the protruding portion 21 may be a bump, and a plurality of bumps are distributed on the pole 20 at intervals, as shown in fig. 2. The arrangement of the plurality of protruding portions 21 reduces the laser welding power of the pole 20 and the tab 12, and can avoid welding through the tab 12.

In some embodiments, the contact surface of the pole 20 and the tab 12 may be a plane or a curved surface, which is not limited herein.

In one embodiment, the battery may include a battery cell 10, two tabs 12 respectively extending from two sides of the cell body 11, one tab being a positive tab and the other tab being a negative tab, and each tab 12 may correspond to a welding press 30 and be connected to a corresponding terminal 20, or only one of the two tabs 12 may correspond to a welding press 30. The pole 20 may be disposed on the cover plate. The cover plate can be connected to the housing part, so that the electrical core 10 is arranged in the installation space formed by the cover plate and the housing part, i.e. the cover plate and the housing part form a housing.

In an embodiment, the battery may include at least two battery cells 10, that is, the number of the battery cells 10 is at least two, and one pressure welding piece 30 is pressed on the tabs 12 of at least two battery cells 10 at the same time, and the polarity of each tab 12 pressed by one pressure welding piece 30 is the same, that is, the tab is a positive tab or a negative tab at the same time, so as to ensure that a plurality of battery cells may form one battery, and on the basis of improving the battery energy, the formation of the battery cells 10 may be facilitated, and the energy requirements of different batteries may be met.

In some embodiments, as shown in fig. 1, the battery may include two battery cells 10, the tabs 12 of the two battery cells 10 are butted, and one press-welding member 30 is simultaneously pressed on the two tabs 12, wherein the two tabs 12 may share one pole 20, so as to achieve reliable connection of the press-welding member 30, the two tabs 12 and the one pole 20. In some embodiments, it is not excluded that the pole 20 may comprise two electrically connected sub-pole poles, whereas two tabs 12 connect the two sub-pole poles, respectively.

In one embodiment, the pressure-welding member 30 may include a plate body that is pressed onto the tab 12.

In one embodiment, as shown in fig. 3, the pressure welding member 30 is provided with a protrusion 31, and the protrusion 31 is pressed on one end of the tab 12 far away from the cell main body 11, i.e. the protrusion 31 can be reliably pressed on the tab 12.

Considering that the tab 12 is formed by gathering a plurality of single tabs, when each single tab is gathered, the middle single tab is longer than other single tabs because the single tab does not need to be gathered upwards or downwards, that is, one side of the tab 12 far away from the cell main body 11 is relatively thin, at this time, the projection 31 arranged on the pressure welding piece 30 can contact with the relatively thin portion of the tab 12, so as to ensure the reliable contact between the pressure welding piece 30 and the tab 12, and ensure the subsequent welding reliability.

When the battery includes two electric cores 10, after the utmost point ear 12 butt joint of two electric cores 10, the middle part of two utmost point ears 12 can be thinner relatively, consequently can form a recess, and protruding 31 on the pressure weldment 30 this moment can reliably press and establish in the recess to guarantee that pressure weldment 30 can play the effect that compresses tightly to the middle part of two utmost point ears 12, guarantee subsequent welding reliability with this.

In one embodiment, the thickness of the protrusion 31 gradually decreases from one end of the tab 12 away from the cell body 11 to the other end of the tab 12 close to the cell body 11, that is, the thickness of the protrusion 31 may change with the thickness of the tab 12, so as to ensure that the pressure welding member 30 can be reliably pressed on the tab 12.

When one pressure welding piece 30 is used for being pressed on one tab 12, the protrusion 31 on the pressure welding piece 30 may change along with the thickness change of the one tab 12, that is, the protrusion 31 may become thinner gradually along one direction, that is, the thickness of the protrusion 31 gradually decreases from one end of the tab 12 far away from the cell main body 11 to the other end of the tab 12 close to the cell main body 11. When one pressure welding piece 30 is used for being pressed on two tabs 12, the protrusion 31 may become thinner gradually in two directions, that is, the thickness of the protrusion 31 gradually decreases along the end portions of the tabs 12 of two battery cells 10 toward the direction close to the other end portions of the tabs 12 of two battery cells 10, so that one pressure welding piece 30 simultaneously presses the two tabs 12, as shown in fig. 3. When the battery includes three or more battery cells 10, the specific structural form of the protrusion 31 is not limited herein, and may be adjusted according to actual requirements, or a plurality of protrusions 31 may be provided to compress.

According to the battery, the compression of the pole lugs is realized through the pressure welding piece, so that the pole lugs are directly welded after the pole lugs are tightly attached to the pole lugs, and the condition that the overcurrent capacity of the battery is influenced due to the fact that insufficient welding and the like occur due to gaps among a plurality of single pole lugs is avoided. And the lug boss is processed on the surface of the pole to increase the flow area and increase the welding area of the pole and the pole lug. The tab can be attached to the pole column after being directly folded without prewelding, and the pressure welding piece compresses the tab, so that the welding procedures are reduced, the production efficiency is improved, and the production cost is reduced.

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

The battery pack according to one embodiment of the present invention includes a battery including a cell 10 and a bonding member 30, and the cell 10 and the bonding member 30 are electrically connected. Each single lug that will form utmost point ear 12 through pressure weldment 30 compresses tightly to make pressure weldment 30 and the utmost point ear 12 welding that compresses tightly, thereby avoid appearing the rosin joint problem between the single lug, with this connection stability that improves pressure weldment 30 and utmost point ear 12, thereby improve the performance of group battery.

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 module may further include an end plate and a side plate for fixing the plurality of batteries.

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, and at this moment, the battery module can be including the end plate and the curb plate of fixed a plurality of batteries. Or, a plurality of batteries can directly set up in the box, need not to carry out in groups a plurality of batteries promptly, utilize the box to fix a plurality of batteries, at this moment, can get rid of end plate and curb plate.

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 cell (10), the battery cell (10) comprises a cell main body (11) and tabs (12), the tabs (12) extend out from the cell main body (11), and the tabs (12) comprise at least two single-piece tabs;

the pressure welding piece (30) is positioned on one side of the lug (12) so as to compress at least two single-piece lugs into the lug (12);

wherein the pressure welding piece (30) is welded with the pole lug (12) pressed by the pressure welding piece.

2. The battery according to claim 1, wherein the pressure welded pieces (30) are laser welded to the tab (12).

3. The battery according to claim 1, characterized in that the battery further comprises a pole (20), the pole (20) being connected with the tab (12).

4. A battery according to claim 3, characterized in that the tab (12) is in direct contact with the pole (20).

5. The battery according to claim 4, characterized in that the pressure-welded pieces (30), the tabs (12) and the poles (20) are integrally laser welded.

6. A battery according to claim 3, characterized in that the end of the pole (20) facing the tab (12) is provided with a projection (21).

7. The battery according to claim 1, characterized in that the number of the battery cells (10) is at least two, and the pressure welding pieces (30) are simultaneously pressed on the tabs (12) of at least two of the battery cells (10).

8. The battery according to any one of claims 1 to 7, characterized in that the pressure welding piece (30) is provided with a protrusion (31), and the protrusion (31) is pressed on one end of the tab (12) far away from the cell main body (11).

9. The battery according to claim 8, wherein the thickness of the protrusion (31) gradually decreases from one end of the tab (12) away from the cell body (11) to the other end of the tab (12) close to the cell body (11).

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