CN219759893U - Current collector and battery - Google Patents

Abstract

The utility model relates to the technical field of batteries, in particular to a current collector and a battery, and aims to solve the problem that the conductivity of a battery core is low due to the fact that the welding area of a tab of an existing battery is small. For this purpose, the current collector comprises a first body and a second body, wherein the first body is connected with the second body through a connecting piece, the first body is provided with a containing part, the second body is extended to form a protruding part matched with the shape of the containing part, the containing part and the protruding part are arranged at intervals, the current collector is connected with the pole through the first body and the protruding part, and the current collector is connected with the pole through the second body. According to the utility model, the accommodating part is arranged on the first body, the protruding part is arranged on the second body, so that the welding area of the tab and the current collector is enlarged on the premise of ensuring the welding effect, the welding area of the tab is enlarged, and the overcurrent capacity of the battery is improved under the condition that the manufacturing cost is not required to be increased.

Description

Current collector and battery

Technical Field

The utility model relates to the technical field of batteries, and particularly provides a current collector and a battery.

Background

The lithium ion battery as a novel secondary battery has the advantages of high energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large energy storage, electric traffic power sources and the like. The common lithium ion battery has three types of cylinder, square and soft package, and the cylinder type lithium ion battery has high energy density due to small redundant space inside the battery and long cycle life due to relatively small expansion of the round winding core.

The battery core of the cylindrical battery is a full tab or a multi-tab, the tab of the battery core needs to be subjected to tab flattening treatment, the tab after flattening needs to be welded and conducted with a pole or a cover plate on one side opposite to the pole, in the prior art, the tabs at two ends of the battery core are respectively conducted with the pole and the cover plate through a current collecting disc, after the battery is installed, a liquid injection through groove is formed in the periphery of a contact area of the current collecting disc and the pole so as to facilitate electrolyte injection into the battery, if the tab is welded in the opposite area of the contact area of the pole, the welding area of the tab is blocked by the liquid injection through groove due to the arrangement of the liquid injection through groove, the welding continuity is difficult to ensure, and the welding effect is affected, so that the tab welding is usually carried out on the periphery of the contact area of the current collecting disc, the welding area of the tab is smaller, and the conductivity of the battery core is reduced.

In summary, the welding area of the tab of the existing battery is smaller, resulting in lower conductivity of the battery core.

Accordingly, there is a need in the art for a new current collector and battery that addresses the above-described problems

Disclosure of Invention

The utility model aims to solve the technical problems, namely the problem that the conductive capacity of the battery core is weakened due to the fact that the welding area of the tab of the existing battery is smaller.

In a first aspect, the present utility model provides a current collector, where the current collector includes a first body and a second body, the first body is connected with the second body through a connecting piece, the first body is provided with a containing portion, the second body extends to form a protruding portion adapted to the shape of the containing portion, the containing portion is spaced from the protruding portion, and the current collector is connected with a pole through the first body and the protruding portion, and is connected with a tab through the second body.

In a preferred embodiment of the current collector, the receiving portion includes a first receiving groove configured to receive the protruding portion and a second receiving groove configured to receive the connecting member.

In the preferred technical scheme of the current collector, the accommodating part and the protruding part are arranged at intervals to form a reserved gap, and the reserved gap comprises a first gap, a second gap and a third gap which are communicated with each other.

In a preferred embodiment of the current collector, a fourth gap is formed between the receiving portion and the connecting member, and the fourth gap communicates with the third gap.

In the preferred technical scheme of the current collector, the plurality of accommodating parts are circumferentially arranged around the first body and uniformly distributed, and the plurality of protruding parts are arranged in one-to-one correspondence with the plurality of accommodating parts on the second body.

In a preferred embodiment of the current collector, the connector is provided with a groove structure to form a safety connection member.

In the preferred technical scheme of the current collector, a connecting portion is arranged on the first body, one end of the connecting piece is connected with the connecting portion, and the other end of the connecting piece is connected with the second body.

In a preferred embodiment of the above current collector, the current collector further includes a first liquid injection member, and the first liquid injection member is disposed through the second body.

In a preferred embodiment of the above current collector, a second liquid injection member is formed between the first body and the second body, and the first liquid injection member and the second liquid injection member are communicated.

In a second aspect, the present utility model also provides a battery comprising a current collector according to any one of the above preferred embodiments.

Under the condition that the technical scheme is adopted, the current collector comprises the first body and the second body, the first body is connected with the second body through the connecting piece, the first body is provided with the containing part, the second body is extended to form the protruding part which is matched with the appearance of the containing part, the containing part and the protruding part are arranged at intervals, wherein the current collector is connected with the pole through the first body and the protruding part, and is connected with the pole through the second body. According to the utility model, the accommodating part is arranged on the first body, the protruding part is arranged on the second body, so that the welding area of the tab and the current collector is enlarged on the premise of ensuring the welding effect, the welding area of the tab is enlarged, and the overcurrent capacity of the battery is improved under the condition that the manufacturing cost is not required to be increased.

Drawings

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of a prior art current collector;

FIG. 2 is a schematic view of a prior art tab weld area of a current collector;

fig. 3 is a block diagram of a current collector according to a first preferred embodiment of the present utility model;

fig. 4 is a block diagram of a current collector according to a second preferred embodiment of the present utility model;

reference numerals:

1. a first body; 11. a housing part; 12. a connection part; 2. a second body; 21. a boss; 22. a first liquid injection member; 3. reserving a gap; 31. a first gap; 32. a second gap; 33. a third gap; 4. a second liquid injection member; 41. a first liquid injection groove; 42. a second liquid injection groove; 5. a connecting piece; 51. a connecting block; 52. a groove structure; 6. and a fourth gap.

Detailed Description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model. For example, the present utility model does not limit the specific type of the vehicle to which the battery is applied, and a person skilled in the art can set the specific type of the vehicle according to the actual use requirement, for example, the vehicle may be an oil vehicle, an electric vehicle, a sedan vehicle, or an SUV vehicle, which are not limitative. Those skilled in the art can adapt it as desired to suit a particular application.

It should be noted that in the description of the present utility model, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either a fixed connection or a removable connection, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Referring to fig. 1 and 2, in the prior art, the surface where the A1 region and the B1 region on the current collector are located is the first surface of the current collector, the A1 region is a region (excluding the C region) surrounded by the outside of the circle with the radius of R1 and the inside of the circle with the radius of R2, the opposite surface where the A1 region and the B1 region are located is the second surface, the region corresponding to the A1 region in the second surface is the welding region of the tab, that is, the area between the R1 and the R2 in the second surface is the weldable area of the tab, the welding wire can be welded in the weldable area, the radius of the B1 region (excluding the C region) is R0, when the current collector is installed in the battery and in place, the B1 region is in close contact with the tab (not shown in the figure), the R0 is less than R1 and less than R2, and the region between the R0 and R2 is the tab, if the tab is welded in the region within the R0, the tab is not welded, the welding effect is difficult to reduce, that is not affected by the welding force of the tab in the welding region, that is not shown in the welding region.

Referring next to fig. 3 and 4, in order to solve the above problems, to expand the welding area of the tab and improve the overcurrent capacity of the battery, the current collector of the present utility model includes a first body 1 and a second body 2, the first body 1 is connected with the second body 2 through a connecting member 5, the first body 1 is provided with a receiving portion 11, the second body 2 is extended to form a protruding portion 21 adapted to the shape of the receiving portion 11, the receiving portion 11 is spaced from the protruding portion 21, wherein the current collector is connected with the tab through the first body 1 and the protruding portion 21, and is connected with the tab through the second body 2.

Specifically, as shown in fig. 3, as the current collector of the first preferred embodiment, the accommodating portion 11 is formed by recessing the first body 1 toward the direction close to the center, the protruding portion 21 is formed by extending the second body 2 toward the direction close to the center, the area of the protruding portion 21 contacting the post is the a area, the B2 area of the first body 1 and the a area of the second body 2 are connected to the post in the state that the post and the current collector are connected in place, the area opposite to the A1 area of the second body 2 is welded to the tab, as can be seen from comparison between fig. 2 and 3, the accommodating portion 11 is arranged such that the original B1 area becomes the B2 area, the protruding portion 21 is arranged such that the original A1 area becomes the A2 area, the area of the B2 area is smaller than the area of the B1 area, the area of the second body 2 corresponding to the A2 area is the welding area of the tab, and the tab is further known as the welding area of the tab is larger because the area of the A1 area becomes the tab is larger.

To sum up, through setting up accommodation portion 11 in first body 1, set up bellying 21 on second body 2, can enlarge the area that can weld of utmost point ear, and the area that enlarges is regional a's area, and the welding area of utmost point ear grow, and then promotes the overflow ability of battery, and simultaneously, bellying 21 belongs to second body 2, and bellying 21 and second body 2 are as a whole promptly, when carrying out utmost point ear welding, can guarantee welded continuity to effectively guarantee the welding effect.

The current collector of the utility model is of a disc-shaped structure, but the current collector is not limited to the disc-shaped structure, and the current collector can be of other shape structures, namely, the current collector is welded with the positive electrode lug of the battery cell, or the current collector is welded with the negative electrode lug of the battery cell, and the shape structure and the electric property of the current collector can be set by a person skilled in the art according to practical situations.

With continued reference to fig. 3, in the preferred embodiment, the accommodating portion 11 and the boss 21 are disposed at intervals to form a reserved gap 3, the reserved gap 3 includes a first gap 31, a second gap 32 and a third gap 33 that are communicated, the first gap 31, the second gap 32 and the third gap 33 are disposed around the boss 21, so that the cross section of the reserved gap 3 is in a "U" shape, the first gap 31 and the third gap 33 are distributed on the current collector along the radial direction, the second gap 32 is disposed on the current collector in an arc direction, which is only a preferred arrangement manner, or alternatively, the first gap 31 and the third gap 33 are disposed in parallel with each other, the second gap 32 is in a straight strip shape, and the shape of the reserved gap 3 can be set by a person skilled in the art according to the actual situation.

The setting of reserve clearance 3, under the condition that the battery breaks down, owing to hold portion 11 and bellying 21 contactless for first body 1 and second body 2 are connected through connecting piece 5 only, if connecting piece 5 disconnection, disconnection first body 1 and second body 2's electric connection can avoid causing because of hold portion 11 and bellying 21's contact, and first body 1 and second body 2 still exist electric connection.

Further, the accommodating portion 11 includes a first accommodating groove provided to be able to accommodate the boss 21, and a second accommodating groove provided to be able to accommodate the connection member 5. Specifically, as shown in fig. 3, the area surrounded by the first gap 31, the second gap 32 and the third gap 33 is a first accommodating groove, the protruding portion 21 is located in the first accommodating groove, the area where the connecting piece 5 is located is a second accommodating groove, which is a preferred arrangement, and the accommodating portion 11 may also include only the first accommodating groove and only the protruding portion 21 may be accommodated, which may be set by a person skilled in the art according to the actual situation.

Furthermore, in the present preferred example, four accommodating portions 11 are circumferentially provided around the first body 1 and uniformly distributed, and four protruding portions 21 are provided in one-to-one correspondence with the plurality of accommodating portions 11 on the second body 2.

It should be noted that, the present utility model does not limit the specific number of the accommodating portion 11 and the protruding portion 21, and the number of the accommodating portion 11 and the protruding portion 21 may be the same, may be three, two or five, and may be other numerical values; the number of the accommodating portions 11 and the number of the protruding portions 21 may be different, and in case of different types, the number of the accommodating portions 11 may be larger than the number of the protruding portions 21, and may be set by a person skilled in the art according to actual situations.

With continued reference to fig. 3, in a first preferred embodiment of the current collector, as shown in fig. 3, the current collector further includes a first injection member 22, the first injection member 22 being disposed through the second body 2.

Specifically, the first liquid injection members 22 are in a straight bar-shaped groove structure penetrating through the second body 2, the number of the first liquid injection members 22 is the same as that of the reserved gaps 3, and the four first liquid injection members 22 are communicated with the four reserved gaps 3 one by one, which is a preferred arrangement mode, and the first liquid injection members 22 are not communicated with the reserved gaps 3.

It will be appreciated by those skilled in the art that, although the first liquid injection member 22 has a straight groove structure in the preferred embodiment, this is not limitative, but the first liquid injection member 22 may have a hole structure, an arc-shaped liquid injection groove structure, or other structures, as long as the function of injecting liquid is achieved, and those skilled in the art can set the structure according to the actual situation.

Further, a second liquid injection member 4 is formed between the first body 1 and the second body 2, and the first liquid injection member 22 and the second liquid injection member 4 are communicated. In a first preferred embodiment of the current collector, the second liquid injection member 4 comprises a first liquid injection groove 41, the first liquid injection groove 41 is positioned between the first body 1 and the second body 2, the first liquid injection groove 41 is in an arc-shaped groove structure, the first liquid injection groove 41 is arranged along the circumferential direction of the current collector, the first liquid injection groove 41 is communicated with the middle part of the first liquid injection member 22 to form liquid injection passages, and the number of the liquid injection passages is four

Based on the above structure setting, annotate the trend of liquid passageway and trend for arc trend and radial trend, and four annotate liquid passageway structures are the same, and four first notes cistern 41 can make the electric core annotate liquid evenly in the circumference direction, and four first notes liquid component 22 can make the electric core annotate liquid evenly in the radial direction, and the area grow of annotating the cistern is made in the setting of second notes liquid component 4, can promote annotate liquid speed.

Referring next to fig. 4, as shown in fig. 4, a second preferred embodiment of the current collector, in addition to the first preferred embodiment, the second liquid injection member 4 further includes a second liquid injection groove 42.

Specifically, the second liquid injection groove 42 is disposed in the area C in fig. 3, the second liquid injection groove 42 is an arc groove structure penetrating through the second body 2, the width of the second liquid injection groove 42 in the radial direction is greater than that of the first liquid injection groove 41 in the radial direction, the clockwise end of the second liquid injection groove 42 is communicated with the first liquid injection member 22, the counterclockwise end of the second liquid injection groove 42 is communicated with the first liquid injection groove 41, and the second liquid injection groove 42 is disposed to further increase the liquid injection rate.

With continued reference to fig. 4, in the second preferred embodiment of the current collector, a fourth gap 6 is formed between the receiving portion 11 and the connecting member 5, the fourth gap 6 is in communication with the third gap 33, and the first gap 31, the second gap 32, and the third gap 33 are covered by the pole in the case where the pole and the current collector are connected in place, so that the first gap 31, the second gap 32, and the third gap 33 do not play a role in injecting liquid in the process of injecting liquid, the first and second liquid injection members 22 and 4, and the fourth gap 6 are not covered by the pole, and thus, the fourth gap 6 can play a role in injecting liquid, and the fourth gap 6 can accelerate the injection rate.

Referring next to fig. 3 and 4, in the current collector of the first and second preferred embodiments, the first body 1 is provided with a connection portion 12, one end of the connection member 5 is connected to the connection portion 12, and the other end of the connection member 5 is connected to the second body 2. Specifically, the connecting portion 12 is a protruding structure on the first body 1, the accommodating portion 11 is formed on the first body 1, the connecting portion 12 is formed at the same time, the clockwise end of the connecting member 5 is connected with the connecting portion 12, the counterclockwise end of the connecting member 5 is connected with the protruding portion 21, so as to realize connection between the first body 1 and the second body 2, which is a preferred arrangement mode, or, the clockwise end of the connecting member 5 is connected with the connecting portion 12, and the end of the connecting member 5 far from the first body 1 is directly connected with the second body 2, which can be set by a person skilled in the art according to the actual situation.

The connecting piece 5 enables the first body 1 and the second body 2 to be connected into an integral structure, so that the installation of the current collector is facilitated, and the integral stability of the internal structure of the battery can be improved under the condition that the current collector is installed in place.

Further, the connector 5 is provided with a groove structure 52 to form a safety connection member.

Specifically, as shown in fig. 3, the connecting piece 5 includes a connecting block 51, a groove structure 52 is disposed in the connecting block 51, the connecting block 51 connects the first body 1 and the second body 2, the groove structure 52 is disposed in the connecting block 51, so that the thickness of the connecting piece 5 is smaller than that of the current collector, more heat is generated when the battery is short-circuited, the connecting piece 5 is fused, the connection between the first body 1 and the second body 2 is disconnected, the protruding portion 21 is covered by the pole under the condition that the current collector is in place, however, an insulating piece is disposed between the protruding portion 21 and the pole, so that the protruding portion 21 and the pole are in an insulating connection state after the first body 1 and the second body 2 are disconnected, the pole is prevented from being connected with the pole through the protruding portion 21, the electrical connection between the pole and the pole is completely disconnected, the battery is prevented from being continuously heated, and serious accidents are caused, and the safety of the battery is improved.

In the utility model, the connecting piece 5 can also play a role of buffering, further ensure the welding effect and ensure the overcurrent capacity of the current collector.

It should be noted that, the current collector of the present utility model may be manufactured by integral molding, or the first body 1 and the second body 2 may be fixedly connected by the connecting piece 5, which can be set by a person skilled in the art according to the actual situation.

It should be noted that, the specific structure of the connector 5 is not limited in the present utility model, and the connector 5 may be a connecting bridge structure for connecting the first body 1 and the second body 2, or may be a connecting rod structure, so long as the connector can be fused when the battery is short-circuited, and a person skilled in the art can set the connector according to the actual situation.

In a second aspect, the utility model also claims a battery comprising a current collector according to any of the above preferred embodiments.

Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.

Claims (10)

1. The utility model provides a current collector, its characterized in that, current collector includes first body and second body, first body pass through the connecting piece with the second body is connected, first body is equipped with the accommodation portion, the second body extend be formed with accommodation portion appearance looks adaptation's bellying, accommodation portion with bellying interval sets up, wherein, current collector passes through first body with bellying is connected with the utmost point post, through the second body is connected with the utmost point ear.

2. The current collector of claim 1, wherein the receiving portion comprises a first receiving slot configured to receive the boss and a second receiving slot configured to receive the connector.

3. The current collector of claim 1, wherein the receiving portion and the protruding portion are disposed at intervals to form a reserve gap, the reserve gap including a first gap, a second gap, and a third gap in communication.

4. A current collector according to claim 3 wherein a fourth gap is formed between the receiving portion and the connecting member, the fourth gap being in communication with the third gap.

5. The current collector according to any one of claims 1 to 4, wherein a plurality of the receiving portions are circumferentially disposed around the first body and uniformly distributed, and a plurality of the protruding portions are disposed on the second body in one-to-one correspondence with a plurality of the receiving portions.

6. The current collector according to any one of claims 1 to 4 wherein the connector is provided with a groove arrangement to form a secure connection member.

7. The current collector according to any one of claims 1 to 4, wherein a connection part is provided on the first body, one end of the connection member is connected to the connection part, and the other end of the connection member is connected to the second body.

8. The current collector of any of claims 1-4, further comprising a first liquid injection member disposed through the second body.

9. The current collector of claim 8, wherein a second injection member is formed between the first body and the second body, the first injection member and the second injection member being in communication.

10. A battery comprising the current collector of any one of claims 1 to 9.