CN217983596U - Current collecting component, end cover assembly, battery module and electric equipment - Google Patents

Abstract

The application discloses mass flow component, end cover subassembly, battery module and consumer, this mass flow component includes: the connecting part is overlapped on the switching part and is connected with the switching part; the tab welding part is connected with the connecting part; the lug welding part is from being close to one side of connecting portion is towards keeping away from one side of connecting portion, at least part the thickness of lug welding part increases gradually. The application provides a current collection component does benefit to utmost point ear welding part inflection.

Description

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

Technical Field

The application relates to the technical field of batteries, in particular to a current collecting component, an end cover assembly, a battery module and electric equipment.

Background

With the increasing improvement of the electric automobile technology, the electric automobile is closer to the daily life of people. The electric automobile has higher requirements on the safety performance of the lithium ion battery for providing energy for the electric automobile, and the requirements on the energy density of the battery core are higher and higher.

The current collecting component of the battery is used for connecting the battery cover plate and the battery core, and in order to improve the energy density of the electrode, the current collecting component of the battery in the prior art is bent after being welded and assembled with the pole lug of the electrode component, so that the internal space occupied by the current collecting component is reduced to improve the energy density of the electrode component.

However, the tab connecting plate and the guide plate of the conventional current collecting member are vertically connected, so that the tab connecting plate and the guide plate are easily rebounded when being bent inwards, and the subsequent assembly with an aluminum shell is affected.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present application and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

It is a primary object of the present application to provide a current collecting member that facilitates the folding back of a tab weld.

In order to achieve the purpose of the application, the following technical scheme is adopted in the application:

according to a first aspect of the present application, there is provided a current collecting member including:

a switching part;

the connecting part is superposed on the switching part and is connected with the switching part;

a tab welding part connected to the connection part; the lug welding part is from being close to one side of connecting portion is towards keeping away from one side of connecting portion, at least part the thickness of lug welding part increases gradually.

According to the current collecting component provided by the embodiment, the thickness of at least part of the lug welding part is gradually increased from the side close to the connecting part to the side far away from the connecting part, so that the thickness of the lug welding part is designed into a form with gradually changed thickness, the thickness of the lug welding part is relatively reduced on the premise of ensuring enough strength of the lug welding part, the effect of folding back the lug welding part is facilitated, the cost can be effectively reduced, the space is saved, and the phenomenon of springback after the lug welding part is folded back is avoided; in addition, the thickness of utmost point ear weld part has been attenuate relatively, can leave more clearances at electric core side, reduces the problem of side swell, also can avoid utmost point ear weld part and aluminum hull side internal face contact, especially with the contact of negative pole, has reduced the risk of inside short circuit.

According to an embodiment of the present application, the tab welding portion is from being close to one side of connecting portion is kept away from one side of connecting portion, the thickness of tab welding portion is crescent earlier, later reduces gradually.

According to the current collecting component provided by the embodiment, the thickness of the lug welding part is gradually increased and then gradually reduced, so that the thickness of the lug welding part is designed to be gradually changed, the thickness of the middle area of the lug welding part is larger, the sufficient strength of the lug welding part is ensured, the thickness of the edge areas on two sides of the lug welding part is smaller, the thickness of the lug welding part is relatively reduced, the effect of the return of the lug welding part is facilitated, the cost can be effectively reduced, the space is saved, and the phenomenon of resilience after the return of the lug welding part is avoided; in addition, the thickness of utmost point ear welding part has been attenuate relatively, can leave more clearances at electric core side, reduces the problem of side swell, also can avoid utmost point ear welding part and aluminum hull side internal face contact, especially with the contact of negative pole, has further reduced the risk of internal short circuit.

According to an embodiment of the present application, the current collecting member further includes:

and the bent part is connected between the connecting part and the lug welding part, and the thickness of the bent part is less than or equal to the minimum thickness of the connecting part.

The current collecting component provided by the embodiment can effectively reduce the cost, save the space and avoid the phenomenon of springback after the tab welding part is folded back through the bending part by enabling the thickness of the bending part to be less than or equal to the minimum thickness of the tab welding part and properly adjusting the thickness of the bending part.

According to an embodiment of the present application, when the tab welding portion and the connecting portion are located on the same plane, the bending portion is in an arc shape protruding toward one side of the adapting portion; the tab welding part can be folded back to one side of the switching part through the bending part.

According to the current collecting component provided by the embodiment, when the tab welding part and the connecting part are in the same plane, the bending part is in the shape of an arc protruding towards one side of the switching part, and after the tab welding part is folded back to one side of the switching part through the bending part, the bending part forms the arc groove, so that the bending radius of the bending position is increased, the bending stress is reduced, the difficulty in folding due to stress concentration can be avoided, the strength of the bending part is relatively increased, the fracture risk is reduced, and the problem that the tab welding part is easy to fracture when being folded back in the prior art is solved; simultaneously, the bellied circular arc section of inflection can increase the distance with switching portion after the tab welding portion inflection, and then can raise the relative switching portion of the utmost point ear of welding on the tab welding portion by a take the altitude, makes utmost point ear and switching portion's side have certain clearance to can avoid utmost point ear by foreign matter fish tail such as the burr of switching portion side.

According to an embodiment of the present application, the thickness of the connection portion is greater than or equal to the thickness of the tab welding portion and the thickness of the bending portion.

The current collecting component provided by the embodiment has the advantages that the thickness of the connecting part is larger than or equal to that of the lug welding part, so that the thickness of the connecting part is relatively larger, and the connecting strength between the connecting part and the adapter part can be ensured.

According to an embodiment of the present application, the tab welding portion is provided with a reinforcing rib.

The current collecting component provided by the embodiment has the advantages that the reinforcing ribs are arranged on the lug welding portion, the structural strength of the lug welding portion is enhanced, the strength of the lug welding portion during folding back is further enhanced, and the situations of fracture, distortion and the like are not prone to occurring during folding back.

According to a second aspect of the present application, there is provided an end cap assembly comprising two current collecting members as described above, one of the two current collecting members being a positive current collecting member and the other being a negative current collecting member.

According to the end cover assembly provided by the embodiment, the current collecting component enables the thickness of at least part of the lug welding part to be gradually increased from one side close to the connecting part to one side far away from the connecting part, the thickness of the lug welding part is designed to be in a thickness gradual change mode, the thickness of the lug welding part is relatively reduced on the premise of ensuring the strength of the lug welding part to be enough, the effect of the return of the lug welding part is easy, the cost can be effectively reduced, the space is saved, and the phenomenon of resilience after the return of the lug welding part is avoided; in addition, the thickness of utmost point ear weld part has been attenuate relatively, can leave more clearances at electric core side, reduces the problem of side swell, also can avoid utmost point ear weld part and aluminum hull side internal face contact, especially with the contact of negative pole, has reduced the risk of inside short circuit.

According to an embodiment of the present application, a thickness of the tab welding part of the positive current collecting member is greater than a thickness of the tab welding part of the negative current collecting member.

The end cover assembly provided by the embodiment is convenient to turn over and save materials, and meanwhile, the flow guide capacity of the flow guide of the tab welding part of the positive electrode current collecting component is ensured.

According to an embodiment of the present application, a thickness of the connection part of the positive current collecting member is greater than a thickness of the connection part of the negative current collecting member.

The end cover assembly provided by the embodiment is convenient to turn over and save materials, and meanwhile, the flow guiding capacity of the flow guiding of the connecting part of the positive current collecting component is guaranteed.

According to a third aspect of the present application, there is provided a battery including:

the battery cell comprises a battery cell body and a lug;

in the end cover assembly, the tab welding part is connected with the tab.

In the battery provided by the embodiment, the current collecting component in the end cover assembly enables the thickness of at least part of the lug welding part to be gradually increased from one side close to the connecting part to one side far away from the connecting part, so that the thickness of the lug welding part is designed to be gradually changed, the thickness of the lug welding part is relatively reduced on the premise of ensuring enough strength of the lug welding part, the effect of folding back the lug welding part is facilitated, the cost can be effectively reduced, the space is saved, and the phenomenon of springback after the lug welding part is folded back is avoided; in addition, the thickness of utmost point ear weld part has been attenuate relatively, can leave more clearances at electric core side, reduces the problem of side swell, also can avoid utmost point ear weld part and aluminum hull side internal face contact, especially with the contact of negative pole, has reduced the risk of inside short circuit.

According to a fourth aspect of the present application, there is provided a battery module including the above-described battery.

According to the battery module provided by the embodiment, the current collecting component in the battery enables the thickness of at least part of the lug welding part to be gradually increased from one side close to the connecting part to one side far away from the connecting part, so that the thickness of the lug welding part is designed to be gradually changed, the thickness of the lug welding part is relatively reduced on the premise of ensuring enough strength of the lug welding part, the effect of folding back the lug welding part is facilitated, the cost can be effectively reduced, the space is saved, and the phenomenon of springback after the lug welding part is folded back is avoided; in addition, the thickness of utmost point ear weld part has been attenuate relatively, can leave more clearances at electric core side, reduces the problem of side swell, also can avoid utmost point ear weld part and aluminum hull side internal face contact, especially with the contact of negative pole, has reduced the risk of inside short circuit, has improved battery module's reliability.

According to a fifth aspect of the present application, there is provided an electric device including the above battery module.

According to the electric equipment provided by the embodiment, the current collecting component in the battery enables the thickness of at least part of the lug welding part to be gradually increased from one side close to the connecting part to one side far away from the connecting part, so that the thickness of the lug welding part is designed to be gradually changed, the thickness of the lug welding part is relatively reduced on the premise of ensuring enough strength of the lug welding part, the effect of folding back the lug welding part is facilitated, the cost can be effectively reduced, the space is saved, and the phenomenon of springback after the lug welding part is folded back is avoided; in addition, the thickness of utmost point ear weld part has been attenuate relatively, can leave more clearances at electric core side, reduces the problem of side swell, also can avoid utmost point ear weld part and aluminum hull side internal face contact, especially with the contact of negative pole, has reduced the risk of inside short circuit, has improved consumer's reliability.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic view of a current collecting member provided in one embodiment of the present application;

fig. 2 is a schematic view of a current collecting member provided in another embodiment of the present application;

fig. 3 is a schematic view illustrating a tab welding portion provided with reinforcing ribs according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of a bend provided in an embodiment of the present application;

fig. 5 is a schematic view of a tab welding portion being folded back according to an embodiment of the present application;

fig. 6 is a schematic view of a tab weld being folded back according to another embodiment of the present application;

FIG. 7 is a schematic view of an end cap assembly provided in accordance with an embodiment of the present application;

FIG. 8 is a schematic view of a battery provided in one embodiment of the present application;

fig. 9 is a schematic view of a current collecting member with tape according to an embodiment of the present application;

FIG. 10 is a side view of FIG. 9 provided in accordance with an embodiment of the present application.

Description of reference numerals:

10. a current collecting member; 110. a switching part; 120. a pole connecting part; 130. a connecting portion; 140. a bending section; 150. a tab welding part; 160. reinforcing ribs;

11. a positive current collecting member; 12. a negative current collecting member;

20. an end cap assembly; 210. a cover plate; 220. a pole column; 230. a safety valve; 240. a liquid injection hole;

30. a battery; 310. a cell body; 320. a tab; 330. provided is an adhesive tape.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

Embodiments of the present application first provide a current collecting member, as shown in fig. 1, the current collecting member 10 including: the tab welding part 150 includes an adapter part 110, a connection part 130, and a tab welding part, wherein the connection part 130 is stacked on the adapter part 110 and connected with the adapter part 110; the tab welding part 150 is connected to the connection part 130; the tab welding part 150 is gradually increased in thickness at least in part from a side close to the connection part 130 toward a side far from the connection part 130. In an example, the thickness of the tab welding part 150 is gradually increased from the bending part to the outside to form the tab welding part 150 with gradually changed thickness, the thickness of the end close to the bending part can be 0.2mm-0.4mm, the thickness of the end far away from the bending part can be 0.4mm-0.8mm, and the minimum thickness can be 40% -60% of the maximum thickness.

The current collecting component provided by the application, through making the tab welding part 150 move towards the side far away from the connecting part 130 from the side close to the connecting part 130, the thickness of at least part of the tab welding part 150 is gradually increased, the thickness of the tab welding part 150 is designed into a form with gradually changed thickness, on the premise of ensuring the strength of the tab welding part 150 to be enough, the thickness of the tab welding part 150 is relatively reduced, the effect of folding back the tab welding part 150 is easy, the cost can be effectively reduced, the space is saved, and the phenomenon of springback after the tab welding part 150 is folded back is avoided; in addition, the thickness of utmost point ear weld part 150 has been attenuate relatively, can leave more clearances at electric core side, reduces the problem of side swell, also can avoid contact of utmost point ear weld part 150 and aluminum hull side internal face, especially with the contact of negative pole, has reduced the risk of internal short circuit.

In an embodiment of the present application, the tab welding part 150 gradually increases and then gradually decreases in thickness from the side close to the connection part 130 toward the side away from the connection part 130. For example, the thickness of the tab welding part 150 gradually increases from the bent portion to the outside to form the tab welding part 150 with gradually changing thickness, the thickness of the tab welding part 150 near the bent portion may be 0.2mm to 0.4mm, the thickness of the tab welding part in the middle region may be 0.4mm to 0.8mm, the thickness of the tab welding part far from the bent portion may be 0.2mm to 0.4mm, and the minimum thickness may be 40% to 60% of the maximum thickness.

The thickness of the tab welding part 150 is designed to be in a thickness gradual change mode by gradually increasing and then gradually reducing the thickness of the tab welding part 150, the thickness of the middle area of the tab welding part 150 is larger, the tab welding part 150 is ensured to have enough strength, the thickness of the edge areas on two sides of the tab welding part 150 is smaller, the thickness of the tab welding part 150 is relatively reduced, the effect of the tab welding part 150 folding back is easy, the cost can be effectively reduced, the space is saved, and the phenomenon of springback after the tab welding part 150 is folded back is avoided; in addition, the thickness of utmost point ear welding part 150 has been attenuate relatively, can leave more clearances at electric core side, reduces the problem of side swell, also can avoid utmost point ear welding part 150 and the contact of aluminium hull side internal face, especially with the contact of negative pole, has further reduced the risk of internal short circuit.

In one embodiment of the present application, as shown in fig. 3 and 4, the current collecting member 10 further includes: a bent portion 140. The bent portion 140 is connected between the connection portion 130 and the tab welding portion 150. The thickness of the bent portion 140 is less than or equal to the minimum thickness of the tab welding portion 150. In an example, the thickness of the bent part 140 is the same as or 70% to 90% of the thickness of the tab welding part 150 at the end near the bent part 140, that is, the same as or 70% to 90% of the minimum thickness of the tab welding part 150. By making the thickness of the bending part 140 less than or equal to the minimum thickness of the tab welding part 150 and by properly making the thickness of the bending part 140, the cost can be effectively reduced, the space can be saved, and the phenomenon of resilience after the tab welding part 150 is folded back through the bending part 140 can be avoided.

In one embodiment of the present application, the thickness of the connection part 130 is greater than or equal to that of the tab welding part 150, and the thickness of the connection part 130 is uniform. For example, the thickness of the connection part 130 may be equal to the maximum thickness of the tab welding part 150 or 110 to 150% of the maximum thickness of the tab welding part 150. By making the thickness of the connection part 130 greater than or equal to the thickness of the tab welding part 150, the thickness of the connection part 130 is relatively large, and the connection strength between the connection part 130 and the adaptor part 110 can be ensured.

In one embodiment of the present application, as shown in fig. 2 and 3, the tab welding part 140 is provided with reinforcing ribs 160. Through set up strengthening rib 160 on utmost point ear welding part 140, strengthened utmost point ear welding part 140's structural strength, and then strengthened the intensity when utmost point ear welding part 140 is turned back, difficult condition such as fracture, distortion appear when turning back. The reinforcing rib 160 may be located on a side of the tab welding part 140 that is folded back and faces the adaptor part 110. The reinforcing rib 160 can be positioned on one side of the tab welding part 140 which faces the adapter part 110 after being folded back, so that the structural strength of the tab welding part 140 can be enhanced on one hand, and the strength of the tab welding part 140 during folding back is further enhanced, so that the tab welding part 140 is not easy to break, distort and deform during folding back; on the other hand, when welding the side of the tab and the tab welding part 140 away from the adapter part 110, the connection surface is relatively flat, and the connection strength between the tab and the tab welding part 140 can be ensured. Of course, the reinforcing rib 160 may be located on one side of the tab welding portion 140 that is separated from the adaptor portion 110 after being folded back, or the reinforcing rib 160 may be located on two opposite sides of the tab welding portion 140 to further enhance the strength of the tab welding portion 140 when being folded back, which is not limited in this application.

In one embodiment of the present application, the reinforcing ribs 160 extend in a direction toward the adaptor portion 110. As shown in fig. 1, the adapter part 110 is a strip shape, an extending direction of the strip shape is an extending direction of the adapter part 110, and an extending direction of the stiffener 160 is perpendicular to or intersects with the extending direction of the adapter part 110. By orienting the extending direction of the reinforcing ribs 160 to the adapter 110, even if the extending direction of the reinforcing ribs is perpendicular to or intersecting with the extending direction of the adapter 110, when the tab welding portion 140 is folded back, the reinforcing ribs 160 can prevent the tab welding portion 140 from being broken, distorted, and the like during folding back, thereby improving the strength of the tab welding portion 140 during folding back. Of course, the extending direction of the reinforcing rib 160 and the extending direction of the adapter 110 may also be parallel, or the extending direction of a part of the reinforcing rib 160 is perpendicular to or intersects with the extending direction of the adapter 110, which is not limited in the present application.

In one embodiment of the present application, a plurality of reinforcing ribs 160 are provided on the tab welding part 140, and the plurality of reinforcing ribs 160 are arranged in parallel. As shown in fig. 3, the plurality of ribs 160 are arranged in parallel, and the extending direction of each of the plurality of ribs 160 is perpendicular to the extending direction of the adapter section 110. Through a plurality of strengthening ribs 160 parallel arrangement, can further increase utmost point ear welding portion 140's structural strength, intensity when further reinforcing utmost point ear welding portion 140 inflection, and then more difficult the condition such as fracture, distortion appear when utmost point ear welding portion 140 inflection. Of course, the plurality of ribs 160 may also be disposed in a non-parallel manner, or only a portion of the plurality of ribs 160 may be disposed in a parallel manner, which is not limited in the present application.

In one embodiment of the present application, the distance between two adjacent reinforcing ribs 160 is the same. As shown in fig. 3, the plurality of reinforcing ribs 160 are arranged in parallel, and the plurality of reinforcing ribs 160 are uniformly distributed on the tab welding part 140 at the same interval. Through making the distance between two adjacent strengthening ribs 160 the same, even a plurality of strengthening ribs 160 interval the same distance evenly distributed on utmost point ear welding portion 140, can further increase utmost point ear welding portion 140's structural strength, intensity when further reinforcing utmost point ear welding portion 140 inflection, and then the condition such as more difficult appearance fracture, distortion when utmost point ear welding portion 140 inflection. Of course, the distance between two adjacent reinforcing ribs 160 may also be different, or only some of the reinforcing ribs 160 may have the same distance, which is not limited in the present application.

In an embodiment of the present application, the reinforcing ribs 160 and the tab welding part 140 are formed as an integral structure, and when the tab welding part 140 is formed, the reinforcing ribs 160 are protruded structures formed by a stamping process from the tab welding part 140, so that the bar-shaped protruded structures are used as the reinforcing ribs 160. The reinforcing ribs 160 and the tab welding part 140 are integrated, so that the strength improvement effect of the reinforcing ribs 160 on the tab welding part 140 can be enhanced; meanwhile, the formation of the reinforcing rib 160 is facilitated, the manufacturing cost of the current collecting member 10 is reduced, and the manufacturing efficiency is improved. Of course, the reinforcing ribs 160 may be connected to the tab welding part 140 by welding, bonding, or the like, which is not limited in this application.

In an embodiment of the present application, the reinforcing ribs 160 penetrate through the opposite sides of the tab welding portion 140 in the longitudinal direction, and the reinforcing ribs 160 penetrate through the opposite sides of the tab welding portion 140 in the longitudinal direction, so that the structural strength of the tab welding portion 140 can be further increased, the strength of the tab welding portion 140 during the folding back can be further enhanced, and the tab welding portion 140 is further less prone to fracture, distortion and other situations during the folding back. Of course, the reinforcing ribs 160 do not penetrate through the opposite sides of the tab welding part 140 in the length direction, for example, one of the two ends of the reinforcing ribs 160 extends to the side of the tab welding part 140, or both of the two ends of the reinforcing ribs 160 extend to the side of the tab welding part 140, or only a part of the reinforcing ribs 160 penetrate through the opposite sides of the tab welding part 140 in the length direction, which is not limited in the present application.

Wherein, the width and thickness of the reinforcing ribs 160 and the distribution mode of the reinforcing ribs 160 can be specifically set by those skilled in the art according to the stress condition when the tab welding part 140 is folded back; the section of the reinforcing rib 160 perpendicular to the length direction can be in a shape of a segment, a triangle, a rectangle, a trapezoid, an irregular shape or the like; all change on the width of strengthening rib, thickness and strengthening rib distribution mode, and with the technical scheme that this application technological effect is the same, all belong to the scope of protection of this application.

In an embodiment of the present application, as shown in fig. 3 and 4, when the tab welding part 150 and the connection part 130 are located on the same plane, the bent part 140 has an arc shape protruding toward one side of the adaptor part 110; the tab welding part 150 may be folded back to one side of the adaptor part 110 by the bending part 140.

When the tab welding part 150 and the connecting part 130 are in the same plane, the bending part 140 is in an arc shape protruding towards one side of the adapter part 110, as shown in fig. 5 and 6, after the tab welding part 150 is folded back to one side of the adapter part 110 through the bending part 140, the bending part 140 forms an arc-shaped groove, the bending radius of the bending position is increased, the bending stress is reduced, the difficulty in folding due to stress concentration can be avoided, the strength of the bending part is relatively increased, the fracture risk is reduced, and the problem that the tab welding part 150 is easy to fracture when being folded back in the prior art is solved; simultaneously, the bellied circular arc section of inflection can increase the distance with switching portion 110 after 150 inflection of utmost point ear welding part, and then can raise the certain height with the relative switching portion 110 of utmost point ear of welding on utmost point ear welding part 150, makes utmost point ear and switching portion 110's side have certain clearance to can avoid utmost point ear by foreign matter fish tail such as burr of switching portion 110 side.

In an embodiment of the present application, as shown in fig. 5, when the tab welding part 150 is folded back to one side of the adaptor part 110 by the bending part 140, the tab welding part 150 and the connecting part 130 are located on the same side of the adaptor part 110. When the tab welding portion 150 can be folded back to one side of the adapter portion 110 through the bending portion 140, the tab welding portion 150 and the connecting portion 130 are located on the same side of the adapter portion 110, and the arc-shaped section is folded back, so that the distance between the folded tab welding portion 150 and the adapter portion 110 can be further increased, the tab welded on the tab welding portion 150 can be further raised by a certain height relative to the adapter portion 110, the gap between the tab and the side edge of the adapter portion 110 is relatively increased, and the tab can be further prevented from being scratched by foreign matters such as burrs on the side edge of the adapter portion 110.

When the reinforcing rib 160 is disposed on a side of the tab welding portion 150 opposite to the adaptor portion 110 (the connecting portion 130), the reinforcing rib 160 may extend to the bending portion 140, for example, one end of the reinforcing rib 160 is located at the tab welding portion 150, and the other end extends to a side of the bending portion close to the adaptor portion 110. By allowing the reinforcing rib 160 to extend to the bent portion 140, the connection strength of the structure of the current collecting member 10 can be further improved.

In an embodiment of the present application, as shown in fig. 6, when the tab welding portion 150 is foldable to one side of the transition portion 110 through the bending portion 140, the tab welding portion 150 and the connection portion 130 are located on two opposite sides of the transition portion 110. Through making utmost point ear welding part 150 and connecting portion 130 be located the both sides that the portion 110 carried on the back mutually, kink 140 has wrapped up the side of portion 110 that switches to thoroughly avoided utmost point ear by the contact of portion 110 side, consequently can not appear the condition that utmost point ear is by foreign matter fish tail such as burr of portion 110 side that switches.

When the reinforcing portion of the reinforcing rib 160 is disposed on a side of the tab welding portion 150 opposite to the adaptor portion 110, the reinforcing rib 160 may extend to the bending portion 140 or extend to the connecting portion 130, for example, one end of the reinforcing rib 160 is located at the tab welding portion 150, and the other end extends to a side of the bending portion close to the adaptor portion 110, or the other end extends and is fixed to an edge of the connecting portion 130. By allowing the reinforcing rib 160 to extend to the bent portion 140 or the connecting portion 130, the connection strength of the structure of the current collecting member 10 can be further improved.

In an embodiment of the present application, the connecting portion 130, the bent portion 140 and the tab welding portion 150 are an integral structure, and the connecting portion 130, the bent portion 140 and the tab welding portion 150 may be formed by a single metal plate through processes of die cutting, stamping and the like. The bent portion 140 is formed through a stamping process, so that the thickness of the bent portion 140 can be relatively reduced, and the bending of the bent portion 140 is facilitated, thereby further avoiding the situation that the bent portion 140 is broken when the tab welding portion 150 is folded back. Of course, the connection portion 130, the bent portion 140, and the tab welding portion 150 may be formed as separate bodies and connected together by welding or the like.

In one embodiment of the present application, as shown in fig. 1, the current collecting member 10 further includes: the pole connecting portion 120. The pole connecting portion 120 is connected to the adapting portion 110, and the pole connecting portion 120 is used for connecting with the pole 220, so as to electrically connect the pole tab and the pole 220 together. Wherein, the pole connecting portion 120 is L-shaped after being connected with the switching portion 110.

The pole connecting portion 120 and the adapter portion 110 may be integrated, and the pole connecting portion 120 and the adapter portion 110 may be formed by a single metal plate through processes such as die cutting and bending. By making the post connecting portion 120 and the adapter portion 110 an integrated structure, the connection strength of the post connecting portion 120 and the adapter portion 110 is improved, and further the strength of the current collecting member 10 is improved; meanwhile, the conductivity of the current collecting member 10 is ensured, and the problem that the conductivity of the current collecting member 10 is affected due to the overlarge resistance of the connecting part 130 when the pole connecting part 120 is connected with the adapter part 110 in a welding mode, an adhesion mode and the like is avoided.

In an embodiment of the application, a chamfer is arranged on the side edge of the adapter part 110, and foreign matters such as burrs on the side edge of the adapter part 110 are removed by the chamfer, so that the tab is prevented from being scratched by the foreign matters such as the burrs on the side edge of the adapter part 110.

Embodiments of the present application also provide an end cap assembly, as shown in fig. 7, the end cap assembly 20 including two current collecting members 10 provided in the above embodiments, one of which is a positive current collecting member 11 and the other of which is a negative current collecting member 12.

The application provides an end cover assembly, through making utmost point ear welding part 150 of collecting component 10 from being close to connecting portion 130 one side towards keeping away from connecting portion 130 one side, at least partial utmost point ear welding part 150's thickness is crescent, make utmost point ear welding part 150's thickness design become the form of thickness gradual change, under the prerequisite of guaranteeing utmost point ear welding part 150 intensity is enough, the thickness of utmost point ear welding part 150 has been thinned relatively, the effect of easy utmost point ear welding part 150 inflection, can effectively reduce cost, save space, the phenomenon that appears kick-backing after avoiding utmost point ear welding part 150 inflection; in addition, the thickness of utmost point ear welding part 150 has been attenuate relatively, can leave more clearances at electric core side, reduces the problem of side swell, also can avoid utmost point ear welding part 150 and the contact of aluminium hull side internal face, especially with the contact of negative pole, has reduced the risk of internal short circuit.

In one embodiment of the present application, the thickness of the tab welding portion of the positive current collecting member 11 is greater than that of the tab welding portion of the negative current collecting member 12; the thickness of the connection portion of the positive current collecting member 11 is greater than that of the connection portion of the negative current collecting member 12. In an example, the overall thickness of the tab welding portion of the negative current collecting member 12 is 20% to 50% smaller than that of the positive current collecting member 11, that is, the thickness of the tab welding portion of the negative electrode is smaller than that of the tab welding portion of the positive electrode, the thickness of the bent portion of the negative electrode is smaller than that of the bent portion of the positive electrode, and the thickness of the negative electrode connecting portion is smaller than that of the positive electrode connecting portion. When the tab welding part of the positive current collecting component 11 is made of aluminum, and the tab welding part of the negative current collecting component 12 is made of copper, the thickness of the positive current collecting component 11 is relatively thicker due to the fact that the overcurrent capacity of aluminum is poorer than that of copper, so that the flow guiding capacity of the tab welding part is guaranteed while the tab welding part is convenient to turn over and saves materials.

Embodiments of the present application also provide a battery, as shown in fig. 8, the battery 30 including: the cell and the end cap assembly 20 provided by the above embodiments. The battery cell comprises a battery cell body 310 and a tab 320, and the tab welding part 150 is connected with the tab 320.

According to the battery provided by the application, the tab welding part 150 of the current collecting component 10 in the end cover assembly 20 is gradually increased from one side close to the connecting part 130 to one side far away from the connecting part 130, at least part of the thickness of the tab welding part 150 is gradually increased, the thickness of the tab welding part 150 is designed to be gradually changed, on the premise that the strength of the tab welding part 150 is enough, the thickness of the tab welding part 150 is relatively reduced, the effect of folding back the tab welding part 150 is easy, the cost can be effectively reduced, the space is saved, and the phenomenon of resilience after the folding back of the tab welding part 150 is avoided; in addition, the thickness of utmost point ear welding part 150 has been attenuate relatively, can leave more clearances at electric core side, reduces the problem of side swell, also can avoid utmost point ear welding part 150 and the contact of aluminium hull side internal face, especially with the contact of negative pole, has reduced the risk of internal short circuit.

In one embodiment of the present application, as shown in fig. 9 and 10, the battery 30 further includes: tape 330. The adhesive tape 330 is adhered to the tab 320 and the cell body 310. After the tab 320 and the tab welding part 150 are turned over, a tape 330 is pasted, one side of the tape 330 covers all the tabs 320 and the tab welding part 150 and can extend to the outer side of the side edge of the adapter part 110, the other side of the tape 330 is pasted on the diaphragm of the cell body 310, the length pasted on the diaphragm is at least 1/3-1/2 of the total length of the tape 330, and the width of the tape 330 is greater than or equal to the length of the tab 320 connecting part 130. The tape 330 may be folded and attached to the tab welding portion 150, or may be folded and attached to the tab welding portion 150.

The adhesive tape 330 can fix the relative position of the battery core tab 320 and the tab welding part 150, protect the tab 320, enhance the anti-shearing and anti-stretching capability of the tab, and prevent the tab from being torn during assembly, transportation or use.

Embodiments of the present application also provide a battery module including the above-described battery 30, such as a battery pack. The battery 30 in the battery module comprises the current collecting component 10, the tab welding part 150 of the current collecting component 10 is gradually increased from one side close to the connecting part 130 to one side far away from the connecting part 130, the thickness of at least part of the tab welding part 150 is gradually increased, the thickness of the tab welding part 150 is designed into a form with gradually-changed thickness, on the premise of ensuring the strength of the tab welding part 150 to be enough, the thickness of the tab welding part 150 is relatively reduced, the effect of folding back the tab welding part 150 is easy, the cost can be effectively reduced, the space is saved, and the phenomenon of springback after the tab welding part 150 is folded back is avoided; in addition, the thickness of relative attenuate utmost point ear welding part 150 can leave more clearances at electric core side, reduces the problem of side swell, also can avoid utmost point ear welding part 150 and the contact of aluminium hull side internal face, especially with the contact of negative pole, has reduced the risk of the inside short circuit of battery, has improved battery module's security. For other advantages of the battery module, please refer to the discussion of the above embodiments, which is not repeated herein.

Embodiments of the present application further provide a power-driven device, which includes the above battery module, and the power-driven device is, for example, a vehicle or an energy storage device. The battery 30 in the electric equipment comprises the current collecting component 10, the tab welding part 150 of the current collecting component 10 is gradually increased in thickness from one side close to the connecting part 130 to one side far away from the connecting part 130, so that the thickness of at least part of the tab welding part 150 is designed to be gradually changed, on the premise of ensuring the strength of the tab welding part 150 to be enough, the thickness of the tab welding part 150 is relatively reduced, the effect of folding back the tab welding part 150 is easy, the cost can be effectively reduced, the space is saved, and the phenomenon of springback after the tab welding part 150 is folded back is avoided; in addition, the thickness of utmost point ear welding part 150 has been attenuate relatively, can leave more clearances at electric core side, reduces the problem of side swell, also can avoid utmost point ear welding part 150 and the contact of aluminium hull side internal face, especially with the contact of negative pole, has reduced the risk of the inside short circuit of battery, has improved the security of consumer. For other beneficial effects of the electric device, please refer to the discussion of the above embodiments, which is not described herein again.

In the examples, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the examples of the application can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred devices or units must have a specific direction, be configured and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present application.

In the description herein, the description of the term "one embodiment" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiment or example. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the claimed embodiments and is not intended to limit the claimed embodiments, and various modifications and changes may be made to the claimed embodiments by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the applied embodiment shall be included in the protection scope of the applied embodiment.

Claims (12)

1. A current collecting member, comprising:

a switching part;

the connecting part is superposed on the switching part and is connected with the switching part;

a tab welding part connected to the connection part; the lug welding part is from being close to one side of connecting portion is towards keeping away from one side of connecting portion, at least part the thickness of lug welding part increases gradually.

2. The current collecting member according to claim 1, wherein the tab welding portion has a thickness that gradually increases and then gradually decreases from a side near the connection portion toward a side away from the connection portion.

3. The current collecting member according to claim 1, further comprising:

and the bent part is connected between the connecting part and the lug welding part, and the thickness of the bent part is less than or equal to the minimum thickness of the lug welding part.

4. The current collecting member according to claim 3, wherein the bent portion has an arc shape protruding toward one side of the transition portion when the tab welding portion and the connection portion are in the same plane; the tab welding part can be folded back to one side of the switching part through the bending part.

5. The current collecting member according to claim 3, wherein a thickness of the connecting portion is greater than or equal to a thickness of the tab welding portion and the bent portion.

6. The current collecting member of claim 1, wherein the tab weld is provided with a reinforcing rib.

7. An end cap assembly comprising two current collecting members according to any one of claims 1 to 6, one of the two current collecting members being a positive current collecting member and the other being a negative current collecting member.

8. The end cap assembly of claim 7, wherein a thickness of the tab weld of the positive current collecting member is greater than a thickness of the tab weld of the negative current collecting member.

9. The end cap assembly of claim 7, wherein a thickness of the connecting portion of the positive current collecting member is greater than a thickness of the connecting portion of the negative current collecting member.

10. A battery, comprising:

the battery cell comprises a battery cell body and a lug;

the end cap assembly of claim 9, said tab weld being connected to said tab.

11. A battery module comprising the battery according to claim 10.

12. An electric device comprising the battery module according to claim 11.

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