CN213150880U

CN213150880U - Secondary battery

Info

Publication number: CN213150880U
Application number: CN202022147293.XU
Authority: CN
Inventors: 孙光林; 鲁俊文; 阚光伟; 张耀
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2021-05-07
Anticipated expiration: 2030-09-27

Abstract

The application discloses a secondary battery, which comprises a naked battery cell, a shell and a top cover, wherein the naked battery cell comprises a coating area and empty foil areas positioned at two ends of the coating area; the naked battery cell is accommodated in the shell, and the shell at least comprises an opening; the top cover is sealed at the opening end of the shell, and two ends of the top cover are respectively and electrically connected with the first pin and the second pin; the first pin and the second pin respectively comprise an L-shaped connecting part and a conductive part electrically connected with the connecting part; the conductive part is electrically connected with the empty foil area, and a support plate is electrically connected to one side of the conductive part close to the coating area; the support plate is in obtuse-angled relation to the conductive portion. This application can effectively fix empty paper tinsel district and coating district through the backup pad, reduces empty paper tinsel district and coating district vibration amplitude under the condition of vibration, impact, avoids the too big empty paper tinsel district of causing of amplitude to weld and seal the juncture foil material and tear.

Description

Secondary battery

Technical Field

The present disclosure relates to energy storage devices, and particularly to a secondary battery.

Background

With the rapid development of the intelligent mobile terminal and the electric automobile industry, it has become a necessary trend to research and develop a lithium ion battery with high specific capacity, high rate performance, long cycle life, rapid charge and discharge, safety and reliability. Various vibration impact loads generated in the driving process of the electric automobile can seriously influence the service life of the power battery. Therefore, the vibration and impact resistance of the battery is critical to ensure the safety, reliability and durability of the entire vehicle.

At present, secondary power battery top cap pin on the market passes through ultrasonic bonding positive and negative pole ear to the realization switches on naked electric core electric current to naked electric core outside by inside. Typically, the bare cell top cap pin consists of a positive pin and a negative pin. The bare cell at the pin side is divided into a coating material area and a hollow foil welding area, and the coating material area contains active substances, so that the mass of a coating part is larger than that of a hollow foil area. In vibration and impact process, the difference of the quality of the empty foil area and the coating material area on both sides makes the acceleration of the two different, easily causes the foil cracking of the empty foil area and the welding and printing junction, influences the performance of the naked electric core, and even seriously can cause the safety risk of the short circuit of the battery.

In view of the above, it is desirable to provide a secondary battery having vibration and impact resistance to overcome the above-mentioned disadvantages

SUMMERY OF THE UTILITY MODEL

A primary object of the present application is to provide a secondary battery, which is intended to ensure reliability and durability of the secondary battery by improving vibration and impact resistance of the secondary battery.

In order to achieve the purpose, the secondary battery provided by the application comprises a naked battery cell, a shell and a top cover, wherein the naked battery cell comprises a coating area and empty foil areas positioned at two ends of the coating area; the naked battery cell is accommodated in the shell, and the shell at least comprises an opening; the top cover is sealed at the opening end of the shell, and two ends of the top cover are respectively and electrically connected with the first pin and the second pin; the first pin and the second pin respectively comprise an L-shaped connecting part and a conductive part electrically connected with the connecting part; the conductive part is electrically connected with the empty foil area, and a support plate is electrically connected to one side of the conductive part close to the coating area; the support plate is in obtuse-angled relation to the conductive portion.

Optionally, the top cover includes a first terminal and a second terminal, and the first terminal and the second terminal are respectively connected to the first pin and the second pin.

Optionally, the connecting portion is provided with a pole post hole, and the first pin and the second pin are connected with the first pole post and the second pole post through the pole post hole.

Optionally, the pole hole is disposed in an edge area of the side of the connection portion away from the conductive portion.

The pole column hole is arranged in the edge area of one side far away from the conductive part, so that the distance between the pole column hole and the conductive part is increased, the impact torque borne by the conductive part and the connecting part at the connecting part is effectively weakened, and the impact vibration resistance effect is obvious.

Optionally, the connecting portion has a crack stop groove at a connection portion with the conductive portion.

Optionally, the crack stop groove is a V-shaped groove.

The V-shaped crack arrest groove can increase the curvature radius of the connecting part and the conductive part, and effectively release stress accumulation in the impact vibration process.

Optionally, the fillet of the edge of the support plate can avoid that foil is punctured by sharp corners in the vibration impact process, resulting in a short circuit risk.

Optionally, the material of the supporting plate corresponds to the material of the conductive part connected thereto.

Optionally, the obtuse angle is 120 ° to 150 °.

This application technical scheme passes through the conductive part electricity of first pin and second pin is connected with the backup pad, the backup pad orientation coating district is buckled, can effectively be fixed empty paper tinsel district is close to the foil material of coating district one side perk, steps up simultaneously coating district passes through under the condition of vibration, impact the backup pad can effectual reduction coating district vibration amplitude, avoids the too big empty paper tinsel district that causes of amplitude to tear at the juncture foil material with coating district.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

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

fig. 2 is a schematic structural view of a first lead tab 30 of the secondary battery shown in fig. 1;

FIG. 3 is a side view of the first tab 30 of FIG. 2;

fig. 4 is a top view of the first tab 30 shown in fig. 2.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Naked electric core	31	Second leading ear
11	Coating zone	32	Connecting part
				12	Empty foil zone	33	Conductive part
20	Top cover	34	Pole hole
				21	First pole	35	Crack-stopping groove
22	Second pole	36	Supporting plate
				30	First leading ear	W1	Obtuse angle

The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that all the directional indications (such as up, down, left, right, front, and rear … …) in the embodiment of the present application are only used to explain the relative position relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indication is changed accordingly.

Also, the meaning of "and/or" and/or "appearing throughout is meant to encompass three scenarios, exemplified by" A and/or B "including scenario A, or scenario B, or scenarios where both A and B are satisfied.

In addition, descriptions in this application as to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

Naked electric core divide into coating district and empty paper tinsel district, because of the coating district contains active substance, can lead to the quality of coating part to be greater than the regional quality of empty paper tinsel, and at vibration and impact in-process, the difference of the empty paper tinsel district of both sides and coating material district quality for both accelerations are different, cause empty paper tinsel region easily and weld seal juncture foil material fracture, influence naked electric core performance, the serious safety risk that can take place the short circuit of battery even.

In view of the above, the present application provides a secondary battery.

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, fig. 1 is a schematic structural diagram of a secondary battery according to an embodiment of the present disclosure; fig. 2 is a schematic structural view of a first lead tab 30 of the secondary battery shown in fig. 1; FIG. 3 is a side view of the first tab 30 of FIG. 2; fig. 4 is a top view of the first tab 30 shown in fig. 2. In the embodiment of the present application, the secondary battery includes a bare cell 10, a case, and a top cap 20.

The bare cell 10 includes a coated region 11 and empty foil regions 12 located at both ends of the coated region 11.

The bare cell 10 is enclosed in a casing, which comprises at least one opening.

The top cover 20 is sealed at the opening end of the housing, the top cover 20 includes a first pole column 21 and a second pole column 22 disposed at two ends, and the first pole column 21 and the second pole column 22 are electrically connected to the first pin 30 and the second pin 31 respectively.

In one embodiment, the first electrode post 21 may be a positive electrode post, the second electrode post 22 may be a negative electrode post, the first pin 30 and the second pin 31 connected to the first electrode post 21 and the second electrode post 22 are a positive electrode pin and a negative electrode pin, respectively, and the material of the first pin 30 may be any suitable positive electrode pin material in the art, such as aluminum; the second lead 31 material can be any suitable negative lead material known in the art, such as copper. In one embodiment, the first terminal post 21 may be a negative terminal post, the second terminal post 22 may be a positive terminal post, and the first pin 30 and the second pin 31 correspondingly connected to the first terminal post 21 and the second terminal post 22 are a negative pin and a positive pin, respectively.

Each of the first and second leads 30 and 31 includes a connection portion 32 in an "L" shape and a conductive portion 33 electrically connected to the connection portion 32.

The connecting portion 32 is provided with a pole hole 34, the first pin 30 and the second pin 31 are connected with the first pole 21 and the second pole 22 through the pole hole 34, in the embodiment of the present application, the pole hole 34 is arranged in the edge area of the connecting portion 32 far away from the conductive portion 33, it can be understood that the pole hole 34 is arranged in the edge area of the connecting portion 32 far away from the conductive portion 33, the distance between the pole hole 34 and the conductive portion 33 is increased, the impact torque force borne by the conductive portion 33 and the connecting portion 32 at the connecting portion is effectively weakened, and the impact vibration resistance effect is obvious.

In an embodiment, the connecting portion 32 is provided with a crack stop groove 35 at the connection position with the conductive portion 33, and in the embodiment of the present application, the crack stop groove 35 is a V-shaped groove, it can be understood that the V-shaped crack stop groove 35 can increase the curvature radius of the connection position between the conductive portion 33 and the connecting portion 32, and effectively release stress accumulation during the impact vibration process.

The conductive portion 33 is electrically connected to the empty foil region 12, and the conductive portion 33 is electrically connected to the support plate 36 on a side close to the coating region 11.

The supporting plate 36 and the conductive portion 33 form an obtuse angle relationship, when the conductive portion 33 is electrically connected with the empty foil area 12 of the bare cell 10, the supporting plate 36 is located at one side edge of the empty foil area 12 close to the coating area 11 and inclines towards the coating area 11, the foil material of the empty foil area 12 is pressed by the conductive portion 33 to cause the edge to tilt upwards by a certain angle, the supporting plate 36 inclines towards the coating area 11, the foil material tilted at one side of the empty foil area 12 close to the coating area 11 can be fixed, the amplitude of the empty foil area 12 at the boundary can be reduced, meanwhile, the coating area 11 can be effectively tightened, the vibration amplitude of the coating area 11 is reduced under the conditions of vibration and impact, the phenomenon that the foil material at the boundary of the empty foil area 12 and the coating area 11 is torn due to the overlarge amplitude is avoided, the obtuse angle W1 is 120-150 degrees, the W1 can be 120 degrees, 130 degrees, the 145 degrees and the 150 degrees, which can be understood, the obtuse angle is overlarge, and, easily causing tearing of the foil in the empty foil region 12; the obtuse angle is too small and the distance between the support plate 36 and the coating zone 11 is too large to effectively clamp the coating zone 11. In one embodiment, the corners of the side of the support plate 36 that is inclined towards the coating zone 11 are rounded, it being understood that the rounded edges are rounded, so as to avoid the risk of short-circuiting when the foil is pierced by sharp corners during the vibration impact. The material of the support plate 36 corresponds to the material of the conductive portion 33 to which it is connected.

To sum up, this application technical scheme passes through the conductive part 33 electricity of first pin 30 and second pin 31 is connected with backup pad 36, and backup pad 36 becomes the obtuse angle relation with conductive part 22, can effectively fix the foil of empty foil district 12 perk, steps up simultaneously coating district 11 can reduce coating district 11 vibration amplitude through backup pad 36 under the condition of vibration, impact, avoids the too big empty foil district 12 of leading to the fact of amplitude to tear at the juncture foil with coating district 11.

The above description is only an alternative embodiment of the present application, and not intended to limit the scope of the present application, and all modifications and equivalents of the structure, which can be directly or indirectly applied to other related technical fields within the spirit of the present application are included in the scope of the present application.

Claims

1. A secondary battery comprising: the battery comprises a naked battery cell, a shell and a top cover, wherein the naked battery cell comprises a coating area and empty foil areas positioned at two ends of the coating area; the naked battery cell is accommodated in the shell, and the shell at least comprises an opening; the top cover is sealed at the opening end of the shell, and two ends of the top cover are respectively and electrically connected with the first pin and the second pin; the LED lamp is characterized in that the first pin and the second pin respectively comprise an L-shaped connecting part and a conductive part electrically connected with the connecting part; the conductive part is electrically connected with the empty foil area, and a support plate is electrically connected to one side of the conductive part close to the coating area; the support plate is in obtuse-angled relation to the conductive portion.

2. The secondary battery of claim 1, wherein the top cap comprises a first pole post and a second pole post, and the first pole post and the second pole post are respectively connected with the first pin and the second pin correspondingly.

3. The secondary battery according to claim 2, wherein the connecting portion is provided with a pole post hole, and the first pin and the second pin are connected with the first pole post and the second pole post through the pole post hole.

4. The secondary battery according to claim 3, wherein the post hole is provided in an edge region of the connecting portion on a side away from the conductive portion.

5. The secondary battery according to claim 1, wherein the connecting portion has a crack stop groove formed at a connection with the conductive portion.

6. The secondary battery according to claim 5, wherein the crack stopper groove is a V-shaped groove.

7. The secondary battery of claim 1, wherein the corners of the support plate are rounded.

8. The secondary battery according to claim 1, wherein a material of the support plate corresponds to a material of the conductive portion to which the support plate is connected.

9. The secondary battery according to claim 1, wherein the obtuse angle is 120 ° to 150 °.