CN218070122U

CN218070122U - Current collecting component, end cover assembly, battery module and electric equipment

Info

Publication number: CN218070122U
Application number: CN202222017803.0U
Authority: CN
Inventors: 王烽; 王静霞
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2022-12-16
Anticipated expiration: 2032-08-02

Abstract

The utility model relates to a mass flow component, end cover subassembly, battery module and consumer, include: a switching part; and the lug connecting part comprises a transition welding part, a bending part and a lug welding part which are sequentially connected, the transition welding part is connected with the switching part, the lug welding part is used for being connected with a lug of the electrode assembly, the bending part and the lug welding part can be lapped below the lug, and at least one part of the projection of the bending part in the direction of the switching part does not fall on the switching part. The outside portion of turning over an in-process kink can contact and jack-up utmost point ear to make and form certain clearance between utmost point ear and the side reason of switching portion, this clearance can prevent that remaining burr, sharp awl structure such as drape over one's shoulders the edge of utmost point ear and switching portion from contacting, thereby protect utmost point ear not by the fish tail and avoid being torn under the vibration environment, guarantee utmost point ear safety and battery safety in utilization and reliability.

Description

Current collecting component, end cover assembly, battery module and electric equipment

Technical Field

The utility model relates to a battery manufacturing technical field especially relates to a mass flow component, end cover subassembly, battery module and consumer.

Background

The battery is the energy supply subassembly that is used for supplying with the electric energy on the new energy automobile, and its working property and stability will direct influence new energy automobile's performance and reliability. Generally, a battery is mainly composed of an end cap, a current collecting member and an electrode assembly, and the current collecting member is connected to terminals on the end cap and tabs of the electrode assembly, respectively, to transmit current. During production, the transition welding part of the current collecting component is welded and fixed with the switching part, the lug welding part and the lug of the electrode component are welded and fixed firstly, and then the integral folding is carried out, and at the moment, a bending part is formed between the transition welding part and the lug welding part.

At present, the kink set up highly and the side reason of switching portion sets up highly collocation not reasonable enough, can cause to turn over the back when utmost point ear and utmost point ear welding part, and utmost point ear can overlap joint on the side reason of kink and switching portion, and the easy fish tail utmost point ear of remaining burr, the flash of a knife or a sword etc. of because of processing on the side reason of switching portion this moment leads to utmost point ear to be torn when electrode subassembly vibration even, has greatly influenced the safe in utilization and the reliability of battery.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide an mass flow component, end cover subassembly, battery module and consumer, aim at solving prior art utmost point ear and turn over the easy fish tail and tear of back, influence the problem of battery safety in utilization and reliability.

In one aspect, the present application provides a current collecting member, including:

a switching part; and

utmost point ear connecting portion, utmost point ear connecting portion are including the transition weld part, kink and utmost point ear weld part that connect gradually, the transition weld part with the portion of switching is connected, utmost point ear weld part is used for being connected with electrode subassembly's utmost point ear, the kink with utmost point ear weld part can the overlap joint in the below of utmost point ear, the kink is in at least partly of the projection of portion's direction of switching does not fall in the portion of switching is last.

The current collecting member of the above-described aspect is applied to a process field where an electrode assembly is connected to an end cap to assemble a battery. Particularly, the transition part is used for being connected with a pole on the end cover, the pole lug connecting part is fixedly connected with the transition part through the transition welding part, the pole lug welding part is fixedly connected with a pole lug of the electrode assembly, and then the pole lug and the pole lug welding part need to be turned over.

The technical solution of the present application is further described below:

in one embodiment, the bent part is in an arc-shaped structure, the distance from the bent part to the side edge of the adapter part is d, and the radius of the bent part is r; wherein d = (0.5-1) r.

In one embodiment, the adapter portion is provided with a first protection structure for facing a side wall of the electrode assembly, and the first protection structure is arranged opposite to a tab of the electrode assembly.

In one embodiment, the adapter part is further provided with a second protection structure on the side wall facing the electrode assembly, and the second protection structure is arranged opposite to the membrane of the electrode assembly.

In one embodiment, the first protection structure and the second protection structure are arranged as chamfers, the length of a right-angle side of each chamfer is C0.1-C1, and the angle of each chamfer is 0-90 degrees.

In one embodiment, a third protection structure is disposed on a side wall of the adapter portion facing the bending portion, and the third protection structure is disposed opposite to the bending portion.

In one embodiment, the peripheral corners of the adapter part are provided with convex arc structures.

In one embodiment, the bending part and the tab welding part are subjected to upsetting thinning treatment, the thickness values of the bending part and the tab welding part are set to be H1, and the thickness value of the transition welding part is set to be H2; wherein, H1= (0.5-0.8) H2.

In another aspect, the present application also provides an end cap assembly comprising:

the end cover comprises an end cover body, wherein a positive pole column and a negative pole column are arranged on the end cover body at intervals; and

according to the current collecting member, the number of the current collecting members is two, the two current collecting members are respectively a positive current collecting member and a negative current collecting member, the positive current collecting member is connected with the positive pole, and the negative current collecting member is connected with the negative pole.

In one embodiment, the overall thickness of the tab connection part of the negative current collecting member is 20% to 50% less than the overall thickness of the tab connection part of the positive current collecting member.

In another aspect, the present application also provides a battery, comprising:

an electrode assembly including a positive electrode tab and a negative electrode tab;

a case in which the electrode assembly is mounted; and

the end cover assembly is arranged at the opening of the shell in a covering manner, the positive current collecting member is connected with the positive electrode tab, and the negative current collecting member is connected with the negative electrode tab.

In addition, this application still provides a battery module, and it includes as above-mentioned battery.

On the other hand, this application still provides a consumer, and it includes as above-mentioned battery module.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present application;

fig. 2 is an assembled structure view of the cap assembly, the positive current collecting member and the negative current collecting member of fig. 1;

fig. 3 is a schematic structural view of the positive current collecting member of fig. 2;

FIG. 4 is a schematic view of the structure of FIG. 3 from another perspective;

fig. 5 is an assembly structure view of the adapter portion and the tab connection portion;

fig. 6 is a structural view illustrating a process of thinning the bent portion and the tab welding portion 322.

Description of the reference numerals:

100. a battery; 10. an electrode assembly; 11. a tab; 20. an end cap assembly; 21. an end cap body; 22. a positive pole column; 23. a negative electrode post; 30. a positive current collecting member; 31. a pole connecting part; 32. a tab connecting part; 321. a transition weld; 322. a tab welding part; 323. a bending section; 33. a switching part; 331. a first protective structure; 332. a second protective structure; 333. a third protection structure; 334. a side edge; 40. a negative current collecting member; 50. and (5) reinforcing ribs.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

As shown in fig. 1 and 2, a battery 100 is provided for the practice of the present application, which includes: an end cap assembly 20, a case (not shown), an electrode assembly 10, and an electrolyte. The electrode assembly 10 is mounted in the case, and the electrode assembly 10 includes a positive electrode tab and a negative electrode tab; the end cover assembly 20 covers the opening of the housing, the positive current collecting member 30 is connected with the positive electrode tab, and the negative current collecting member 40 is connected with the negative electrode tab.

The end cap assembly 20 includes: an end cap body 21 and a collecting member. The end cover body 21 is provided with a positive electrode pole 22 and a negative electrode pole 23 at intervals; the two current collecting members are respectively a positive current collecting member 30 and a negative current collecting member 40, the positive current collecting member 30 is connected with the positive pole post 22, and the negative current collecting member 40 is connected with the negative pole post 23.

The electrode assembly 10 is composed of a positive electrode plate, a negative electrode plate, and a separator. Battery 100 operates primarily by virtue of metal ions moving between the positive and negative pole pieces. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear.

Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the anodal mass flow body protrusion in the anodal mass flow body of coating the negative pole active substance layer of uncoated negative pole active substance layer, the anodal mass flow body of uncoated negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current can be passed through without fusing, a plurality of positive electrode tabs are stacked together, and a plurality of negative electrode tabs are stacked together.

The material of the separator may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly 10 may have a winding type structure or a lamination type structure, and the embodiment of the present application is not limited thereto.

As shown in fig. 1 and 2, the positive current collecting member 30 and the negative current collecting member 40 are respectively installed at both ends of the end cover body 21 in the length direction, and an installation space is defined therebetween. The electrode assembly 10 is disposed in the mounting space so as to be compactly assembled with the end cap assembly 20. It should be noted that an insulating layer is further installed on the bottom surface of the end cap body 21, and the insulating layer prevents the electrode assembly 10 from directly contacting the end cap body 21 to cause a short circuit. For example, the insulating layer may be any one of a rubber pad, a foam pad, and the like.

With continued reference to fig. 2 to 5, a current collecting member according to an embodiment of the present disclosure is shown, which includes: an adapter portion 33 and a tab connecting portion 32. The tab connecting portion 32 is mounted on the lower end of the adaptor portion 33. In addition, the current collecting member further comprises a pole connecting portion 31, the pole connecting portion 31 is connected with the upper end, far away from the pole connecting portion 32, of the adapter portion 33, and the pole connecting portion 31 is used for being connected with a pole.

It should be noted that, the pole connecting portion 31, the adapting portion 33 and the tab connecting portion 32 are preferably an integrally formed structure, so as to ensure high structural strength and good structural performance. Wherein, utmost point post connecting portion 31 adopts the welding mode fixed with utmost point post, connects firmly reliably. The adaptor portion 33 is integrally bent and connected to the pole connecting portion 31, and the adaptor portion 33 extends toward the lower side of the end cap body 21, perpendicular or approximately perpendicular to each other. The tab connecting portion 32 and the adapting portion 33 are welded and fixed, and the connection is stable and reliable.

In this embodiment, the tab connection portion 32 includes a transition welding portion 321, a bending portion 323, and a tab welding portion 322 that are connected in sequence, the transition welding portion 321 is connected to the adapter portion 33, the tab welding portion 322 is used for being connected to the tab 11 of the electrode assembly 10, the bending portion 323 and the tab welding portion 322 can be overlapped below the tab 11, and at least a portion of a projection of the bending portion 323 in the direction of the adapter portion 33 does not fall on the adapter portion 33. In other words, at least a portion of the bent portion 323 is disposed higher than the side edge 334 of the adaptor portion 33.

In summary, the implementation of the technical solution of the present embodiment has the following beneficial effects: the current collecting member of the above-described aspect is applied to a process field where the electrode assembly 10 is connected to an end cap to assemble the battery 100. Specifically, the adaptor portion 33 is used for being connected with a pole on an end cover, the tab connection portion 32 is connected and fixed with the adaptor portion 33 through the transition welding portion 321, the tab welding portion 322 is further connected and fixed with the tab 11 of the electrode assembly 10, and then the tab 11 and the tab welding portion 322 need to be turned over, in this process, at least a part of a projection of the bent portion 323 in the direction of the adaptor portion 33 does not fall on the adaptor portion 33, that is, at least a part of the bent portion 323 is set higher than the side edge 334 of the adaptor portion 33 close to the bent portion 323, so that an outer side portion of the bent portion 323 contacts and jacks up the tab 11 during the turning over process, so that a certain gap is formed between the tab 11 and the side edge 334 of the adaptor portion 33, the gap can prevent the tab 11 from contacting with a pointed cone structure such as burrs and flash remaining on the side edge 334 of the adaptor portion 33, thereby protecting the tab 11 from being scratched and being torn under a vibration environment, and ensuring safety and reliability of the tab 11 and use of the battery 100.

In some embodiments, the bent portion 323 has a circular arc structure. Therefore, the arc arch outside the bending part 323 jacks up the tab 11 in the folding process, so that a non-contact safety gap is formed between the tab 11 and the side edge 334 of the adapter part 33, and the arc arch of the bending part 323 contacts with the tab 11, so that the tab 11 is not scratched.

The distance that the bent part 323 is higher than the side edge 334 of the adapter part 33 is set as d, and the radius of the bent part 323 is set as r; wherein d = (0.5-1) r. In the numerical ratio setting range, the gap formed between the tab 11 and the side edge 334 of the adapter 33 is not too small, so that some high burrs still have the risk of scratching the tab 11; meanwhile, the gap is not too large, so that excessive gap margin is caused, and the thickness of the transition welding part 321 and the whole tab 11 is increased, so that the occupied space is too large.

With reference to fig. 2, fig. 4 and fig. 5, in addition, on the basis of any of the above embodiments, the adapter 33 is provided with a first protection structure 331 on a side wall facing the electrode assembly 10, and the first protection structure 331 is provided to be opposite to the tab 11 of the electrode assembly 10. Specifically, the first protection structure 331 is a chamfer, and by providing the chamfer, even if the tab 11 contacts with the side edge 334 of the adapter 33 after being turned over, the tab 11 is only overlapped on the chamfer and does not directly contact with sharp burrs or the like on the side edge 334 of the adapter 33, so as to reduce the risk that the tab 11 is scratched or cracked. Of course, the first protection structure 331 in other embodiments may also be other structures with the function of protecting the tab 11, such as round corners.

Further, the adaptor 33 is further provided with a second protection structure 332 on a side wall facing the electrode assembly 10, and the second protection structure 332 is arranged opposite to the membrane of the electrode assembly 10. Specifically, the second protection structure 332 is a chamfer slope, and by providing the chamfer slope, even when the membrane is turned over and contacts with the side edge 334 of the adapter 33, the membrane is only overlapped on the chamfer slope and does not directly contact with sharp burrs or the like on the side edge 334 of the adapter 33, so that the risk of scratching or cracking of the membrane is reduced. Of course, the second protection structure 332 in other embodiments may also be a rounded corner or other structures having the function of protecting the tab 11.

In this embodiment, the first protection structure 331 and the second protection structure 332 are configured as chamfers, a length of a right-angle side of each chamfer is C0.1-C1, and an angle of each chamfer is 0-90 °. Therefore, the size of the chamfer can be flexibly designed according to actual needs, the product diversity is improved on the premise of ensuring the safety of the tab 11 and the diaphragm, and the adaptability of the adapter part 33 facing different electrode assemblies 10 is improved. It should be noted that the angle of the chamfer should not include both the 0 ° and 90 ° extremes.

In addition, in still other embodiments, a third protection structure 333 is disposed on a sidewall of the adaptor portion 33 facing the bending portion 323, and the third protection structure 333 is disposed opposite to the bending portion 323. Specifically, the third protection structure 333 is also configured as a chamfer slope, which can increase the safety distance between the side edge 334 of the adapting portion 33 and the bending portion 323, and can avoid the structure scratches such as burrs and burrs left on the side edge 334 of the adapting portion 33 during the bending process of the bending portion 323. Of course, in other embodiments, the third protection structure 333 may be a rounded corner or other structures having the function of protecting the hinge 323.

Further, in still other embodiments, the peripheral corners of the adaptor portion 33 are provided with convex arc structures. At this time, the peripheral corners of the adapting portion 33 are smooth convex arc surfaces, which can prevent the tab 11, the membrane, the bending portion 323 and the like from being accidentally scratched by the burrs and other structures on the side edge 334 of the adapting portion 33 during the installation of the electrode assembly 10.

With reference to fig. 6, in one embodiment, the bending portion 323 and the tab welding portion 322 are subjected to a thinning process, the thickness of the bending portion 323 and the tab welding portion 322 is set to H1, and the thickness of the transition welding portion 321 is set to H2; wherein, H1= (0.5-0.8) H2. The entire thickness of the tab connection part 32 of the negative current collecting member 40 is 20 to 50% less than that of the tab connection part 32 of the positive current collecting member 30. The thinning of the pier is a common machining method, and can be understood as reducing the whole thickness or the local thickness of a machined object by adopting a machining method such as extrusion, stamping, beating and the like.

On the premise of ensuring that the strength of the tab connecting part 32 is sufficient, the thicknesses of the tab welding part 322 and the bending part 323 are properly reduced, so that the cost can be effectively reduced, the space of the battery 100 is saved, the bending difficulty is reduced, and the phenomenon of springback after the tab welding part 322 is turned over is avoided;

in order to improve the structural strength of the adapter 33 and ensure that the electrode assembly 10 is stably and reliably supported, the adapter 33 is provided with the reinforcing rib 50 to ensure that the overall structural stability of the battery 100 is good.

In addition, the present application also provides an electric device, which includes a battery module, where the battery module includes the battery 100 according to any of the above embodiments.

The battery 100 may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not particularly limited in the embodiments of the present application. The battery 100 may have a cylindrical shape, a flat body, a rectangular parallelepiped shape, or other shapes, which is not particularly limited in the embodiments of the present application. The battery 100 is generally divided into three types in an encapsulated manner: cylindrical batteries, square batteries and pouch batteries.

The battery module referred to in the embodiments of the present application refers to a single physical module including one or more batteries 100 to provide higher voltage and capacity. For example, the battery module mentioned in the present application may include a battery cell or a battery pack, etc. The battery module generally includes a case for housing one or more batteries 100, and the case prevents liquid or other foreign substances from affecting the charge or discharge of the batteries 100.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Claims

1. A current collecting member, comprising:

a switching part; and

2. The current collecting member according to claim 1, wherein the bent portion is a circular arc-shaped structure, a distance between the bent portion and a side edge of the transition portion is d, and a radius of the bent portion is r; wherein d = (0.5-1) r.

3. The current collecting member according to claim 1, wherein the adapter portion is provided with a first protection structure for facing a sidewall of the electrode assembly, the first protection structure being provided to be opposite to a tab of the electrode assembly.

4. The current collecting member according to claim 3, wherein the adapter portion is further provided with a second protective structure for facing a side wall of the electrode assembly, the second protective structure being disposed opposite to a separator of the electrode assembly.

5. The current collecting member according to claim 4, wherein the first and second protective structures are provided as chamfers having a right angle side of C0.1-C1 and an angle of 0-90 °.

6. The current collecting member according to claim 1, wherein a sidewall of the transition portion facing the bent portion is provided with a third protection structure, the third protection structure being disposed opposite to the bent portion.

7. The current collecting member according to claim 1, wherein peripheral corners of the transition portion are provided in a convex arc-shaped configuration.

8. The current collecting member according to claim 1, wherein the bent portion and the tab welding portion are processed to be thin, and the thickness value of the bent portion and the tab welding portion is set to H1, and the thickness value of the transition welding portion is set to H2; wherein, H1= (0.5-0.8) H2.

9. An end cap assembly, comprising:

the current collecting member according to any one of claims 1 to 8, which is provided in two and is a positive current collecting member and a negative current collecting member, respectively, the positive current collecting member being connected with the positive electrode post, and the negative current collecting member being connected with the negative electrode post.

10. The end cap assembly of claim 9, wherein the overall thickness of the tab connection portion of the negative current collecting member is 20% -50% less than the overall thickness of the tab connection portion of the positive current collecting member.

11. A battery, comprising:

a case in which the electrode assembly is mounted; and

the end cap assembly of claim 9 or 10, capped at the opening of the housing, the positive current collecting member connected to the positive tab and the negative current collecting member connected to the negative tab.

12. A battery module characterized by comprising the battery according to claim 11.

13. An electric device characterized by comprising the battery module according to claim 12.