CN220628170U

CN220628170U - Electrode lead-out member, end cap assembly, secondary battery, and electronic device

Info

Publication number: CN220628170U
Application number: CN202322290933.6U
Authority: CN
Inventors: 曹星宇; 陈虎; 赵功威
Original assignee: Vision Power Technology Hubei Co ltd; Yuanjing Power Technology Ordos Co ltd; Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Vision Power Technology Hubei Co ltd; Yuanjing Power Technology Ordos Co ltd; Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2023-08-24
Filing date: 2023-08-24
Publication date: 2024-03-19
Anticipated expiration: 2033-08-24

Abstract

The utility model provides an electrode lead, an end cap assembly, a secondary battery, and an electronic device. The electrode lead-out member includes: the connecting plate is provided with a pole connecting region, a pole lug connecting region and a connecting part for connecting the pole connecting region and the pole lug connecting region, and a hollowed-out part is arranged between at least two pole lug connecting regions on the connecting plate; a pole terminal disposed on the pole connection region; wherein, the connecting part is provided with a lightening hole communicated with the hollowed-out part; and along the length direction of the tab connection region, the shortest distance from the lightening hole to the side wall of the connection plate is smaller than the width of the tab connection region. The weight of the connecting plate is reduced, and the energy density of the battery monomer is improved. When the battery core is short-circuited, the electrode lug connection area and the electrode post connection area can be conveniently and quickly fused under the condition of heat rising.

Description

Electrode lead-out member, end cap assembly, secondary battery, and electronic device

Technical Field

The utility model relates to the technical field of batteries, in particular to an electrode lead-out piece, an end cover assembly, a secondary battery and electronic equipment.

Background

In the existing welding scheme of the lithium ion battery winding core and the end cover, the traditional positive and negative connecting sheets and the ultrasonic welding protecting sheets are omitted, one end of the electrode lug is connected with the winding core, the other end of the electrode lug is welded with the electrode post bottom plate, the winding core is directly welded on the electrode post bottom plate through the electrode lug in a laser mode, and therefore electric connection of the winding core and the end cover is achieved. The pole bottom plate needs to be made large in this way, but in the traditional scheme, the weight of the pole bottom plate is large, especially on the negative side, and the weight of the pole bottom plate on the negative side is large because the pole bottom plate is made of copper, and the copper density is high. In addition, in the scheme, the cross section area of the position of the pole bottom plate fuse link is large, so that the heat required by fusing the pole bottom plate is large in the cell short circuit test, the pole bottom plate is not easy to fuse quickly, and the short circuit test is difficult to pass. Accordingly, there is a need to provide an electrode lead, an end cap assembly, a battery, and an electronic device.

Disclosure of Invention

In view of the above drawbacks of the prior art, an object of the present utility model is to provide an electrode lead-out member, an end cap assembly, a secondary battery, and an electronic device, so as to solve the problem that the cross-sectional area of a post base plate is large and is not easy to be quickly fused when a cell is shorted in the prior art.

To achieve the above and other related objects, the present utility model provides an electrode lead-out member comprising: the pole connecting device comprises a connecting plate and pole terminals, wherein a pole connecting region, a pole lug connecting region and connecting parts for connecting the pole lug connecting region and the pole lug connecting region are arranged on the connecting plate, and a hollowed-out part is arranged between at least two pole lug connecting regions on the connecting plate; the pole terminal is arranged on the pole connecting area; wherein, the connecting part is provided with a lightening hole communicated with the hollowed-out part; and along the length direction of the tab connection region, the shortest distance from the lightening hole to the side wall of the connecting plate is smaller than the width of the tab connection region.

In an embodiment of the utility model, the weight-reducing hole has a first side wall and a second side wall perpendicular to each other, the first side wall is formed on one side of the tab connection area facing the hollowed-out portion and parallel to the outer end surface of the tab connection area, the second side wall is formed on one side of the connection area facing the hollowed-out portion, and the distance from one side of the connection area facing away from the hollowed-out portion to the second side wall is smaller than the distance from the outer end surface of the tab connection area to the first side wall.

In an embodiment of the present utility model, the weight-reducing hole further has a third sidewall parallel to the first sidewall, and a distance d between the third sidewall and the first sidewall ₁ The distance from the outer end surface of the tab connection region to the first side wall is d ₂ 0.1d ₂ <d ₁ <0.5d ₂ 。

In an embodiment of the utility model, an avoidance portion is disposed at a side of the pole connection region facing the hollowed-out portion.

In an embodiment of the present utility model, the electrode lead-out member includes a first electrode lead-out member and a second electrode lead-out member having opposite polarities, and the weight-reducing hole of the first electrode lead-out member is different from the weight-reducing hole of the second electrode lead-out member in arrangement position and/or shape.

In an embodiment of the utility model, a side of the lightening hole of the first electrode lead-out piece, which is away from the hollowed-out portion, is a linear end face, and a side of the lightening hole of the second electrode lead-out piece, which is away from the hollowed-out portion, is an arc end face.

In one embodiment of the present utility model, there is also provided an end cap assembly comprising: the electrode lead-out member comprises an end cover body, a lower insulating member and any one of the electrode lead-out members, wherein the end cover body is provided with a through hole; the lower insulating piece is arranged on one side of the end cover body; the post terminal of the electrode lead-out part penetrates through the lower insulating part and is at least partially arranged in the through hole, and at least partial area on the connecting plate of the electrode lead-out part is abutted to one side, deviating from the end cover body, of the lower insulating part.

In an embodiment of the present utility model, the connecting plate is provided with a positioning hole, and the lower insulating member is provided with a positioning portion matched with the lightening hole and/or the positioning hole.

In an embodiment of the present utility model, there is also provided a secondary battery including: a housing, an electrode assembly and any one of the above end cap assemblies, the electrode assembly being received within the housing, the electrode assembly comprising a body portion and a tab connected to the body portion; the electrode assembly is characterized in that the electrode lug and the electrode lead-out piece are connected in the electrode lug connection area, and the end cover body of the end cover assembly is covered at the opening of the shell.

In an embodiment of the present utility model, there is also provided an electronic device including the above secondary battery.

In summary, the utility model provides an electrode lead-out member, an end cover assembly, a secondary battery and an electronic device, wherein the electrode lead-out member is provided with a hollowed-out part between two lug connection areas of a connecting plate, so that the weight of the connecting plate is greatly reduced, and the energy density of a battery monomer is improved. In addition, set up the lightening hole with fretwork portion intercommunication between the utmost point ear connecting region and the utmost point post connecting region of connecting plate, and along utmost point ear connecting region length direction, the shortest distance of lightening hole to connecting plate lateral wall is less than utmost point ear connecting region width. Therefore, when the overcurrent area of the connecting plate is ensured, the battery cell can be short-circuited, under the condition of heat rise, the quick fusing between the lug connection area and the pole connection area is convenient, and the dangerous situations such as explosion and fire caused by the short circuit of the battery cell are effectively prevented. By arranging the lightening holes, the weight of the connecting plate can be further lightened, and the overcurrent protection function can be realized when the battery cells are in short circuit.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view showing the structure of an electrode lead-out member according to an embodiment of the present utility model;

FIG. 2 is a top view of an electrode lead-out member according to an embodiment of the present utility model;

FIG. 3 is a top view of an electrode lead-out member according to an embodiment of the present utility model;

FIG. 4 shows a cross-sectional view of FIG. 3 taken along the direction B-B;

FIG. 5 shows a partial enlarged view of area A of FIG. 4;

FIG. 6 is a schematic view showing the structure of an electrode lead-out member with a relief portion according to an embodiment of the present utility model;

FIG. 7 shows a cross-sectional view of FIG. 6 along the direction C-C;

FIG. 8 is an enlarged view of a portion of region D of FIG. 7;

FIG. 9 is an exploded view of an end cap assembly according to one embodiment of the present utility model;

FIG. 10 is a schematic view of the overall structure of an end cap assembly according to an embodiment of the present utility model;

fig. 11 is a schematic view showing the structure of a secondary battery according to an embodiment of the present utility model;

fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the utility model.

Description of element numbers:

100. a secondary battery; 110. a housing; 120. an electrode assembly; 130. an end cap assembly; 131. an end cap body; 1311. a through hole; 132. a lower insulating member; 1321. a positioning part; 133. an upper insulating member; 134. a seal; 135. a pressure release mechanism; 140. an electrode lead; 141. a connecting plate; 142. a post connection region; 1421. an avoidance unit; 143. a tab connection region; 1431. the outer end surface of the lug connection area; 144. a connection part; 145. a hollowed-out part; 146. a lightening hole; 1461. a first sidewall; 1462. a second sidewall; 1463. a third sidewall; 147. a post terminal; 150. a first electrode lead; 160. a second electrode lead; 10. an electronic device; 11. a working part.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

Please refer to fig. 1 to 12. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the utility model, are included in the spirit and scope of the utility model which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs and to which this utility model belongs, and any method, apparatus, or material of the prior art similar or equivalent to the methods, apparatus, or materials described in the examples of this utility model may be used to practice the utility model.

Referring to fig. 1 to 12, the present utility model provides an electrode lead 140, an end cap assembly 130, a secondary battery 100, and an electronic device 10. A lightening hole 146 communicated with the hollowed-out portion 145 is formed between the tab connection region 143 and the post connection region 142 of the connection plate 141, and the shortest distance from the lightening hole 146 to the side wall of the connection plate 141 is smaller than the width of the tab connection region 143 along the length direction of the tab connection region 143. Therefore, when the overcurrent area of the connecting plate 141 is ensured, the battery cell can be conveniently and quickly fused between the tab connecting area 143 and the pole connecting area 142 under the condition of heat rise when the battery cell is short-circuited, and dangerous situations such as explosion and fire caused by the short circuit of the battery cell are effectively prevented. By forming the lightening holes 146, the weight of the connecting plate 141 can be lightened, and the overcurrent protection function can be realized when the battery cells are in short circuit.

Referring to fig. 1, 2 and 11, the electrode lead 140 includes: a connection plate 141 and a post terminal 147. The connection plate 141 is provided with a tab connection region 142, a tab connection region 143, and a connection portion 144 for connecting the tab connection region 142 and the tab connection region 143, the tab connection region 143 is symmetrically distributed on both sides of the tab connection region 142 along a length or width direction of the tab connection region 142, and the tab connection region 143 faces one side of the electrode assembly 120, and at least a portion of the region is welded with a tab led out from the electrode assembly 120. The pole terminal 147 is disposed on the pole connection region 142, and a hollowed-out portion 145 is disposed between at least two pole ear connection regions 143 of the connection plate 141. The shape of the hollowed-out portion 145 is not limited as long as the weight of the connecting plate 141 can be effectively reduced, for example, a circle, a square, etc., and preferably, one side of the connecting plate 141 facing away from the pole connection region 142 is concaved inwards to form the hollowed-out portion 145. Particularly, when the electrode lead 140 is a negative electrode lead, the connecting plate 141 of the negative electrode is made of copper, and the density of copper is high, so that the connecting plate 141 of the negative electrode has a large weight, and the hollow portion 145 can greatly reduce the weight of the connecting plate 141. The connecting portion 144 is provided with a lightening hole 146 communicated with the hollow portion 145, and the lightening hole 146 extends to one side away from the hollow portion 145 along the length direction of the tab connecting region 143. By providing the weight reducing holes 146 on the connection plate 141, the weight reducing effect can be further achieved, and the mass density of the battery can be improved. Further, the width of the tab connection region 143 is denoted as d ₂ The shortest distance from the weight-reducing hole 146 to the sidewall of the connection plate 141 along the length direction of the tab connection region 143 is denoted as d ₃ Then the following is satisfied: d, d ₃ <d ₂ . Therefore, in the process of testing the short circuit of the battery core, when the current passing through the connecting plate 141 is too large, the connecting plate 141 can be fused at the connecting part 144 in time, so that the battery is broken, the problems of fire explosion and the like caused by the short circuit of the battery are effectively prevented, and the overcurrent protection of the connecting plate 141 is realized.

With continued reference to fig. 1 and 2, in an embodiment of the present utility model, a post terminal 147 is integrally formed on the post connecting region 142. Through this integrated into one piece structure, increased the area of contact of utmost point post and utmost point ear, enlarged the area that overflows of utmost point post terminal 147 and connecting plate 141, reduced the temperature rise when having reduced the internal resistance, promoted the security performance of battery. And, the welding procedure between the pole terminal 147 and the adapter piece is cancelled, and the production efficiency of the battery cell is improved.

Referring to fig. 2 and 3, in an embodiment of the utility model, the weight-reducing hole 146 has a first sidewall 1461 and a second sidewall 1462 perpendicular to each other, the first sidewall 1461 is formed on a side of the tab connection region 143 facing the post connection region 142 and parallel to the outer end surface 1431 of the tab connection region, and the second sidewall 1462 is formed on a side of the connection portion 144 facing the hollow portion 145. The vertical distance d from one side of the connecting portion 144 away from the hollow portion 145 to the second side wall 1462 (i.e. the shortest distance from the weight-reducing hole 146 to the side wall of the connecting plate 141) ₃ The vertical distance d from the tab junction region outer end surface 1431 to the first sidewall 1461 (i.e., the width of the tab junction region 143) ₂ The two conditions are as follows: d, d ₃ <d ₂ . When the current flowing through the connection plate 141 is excessively large due to a short circuit or the like inside the battery, d is a factor ₃ <d ₂ The connecting plate 141 can be fused in time at the connecting part 144, so that the safety performance of the battery is greatly improved, and the short circuit test of the battery core is facilitated.

Referring to fig. 2 to 5, further, considering that if the width of the lightening hole 146 is too large, the current conduction of the connection plate 141 is not facilitated, if the width of the lightening hole 146 is too narrow, the fusing cannot be performed quickly and timely. To avoid this problem, in an embodiment of the present utility model, the weight-reducing hole 146 further has a third sidewall 1463 parallel to the first sidewall 1461, and the distance between the third sidewall 1463 and the first sidewall 1461 (i.e. the width of the weight-reducing hole 146) is d ₁ The distance from the tab junction region outer end surface 1431 to the first side wall 1461 is d ₂ The dimensions between the two satisfy: 0.1d ₂ <d ₁ <0.5d ₂ . When the width of the lightening hole 146 is within the range, the welding area of the tab is not occupied, the overcurrent area of the connecting plate 141 is ensured, and the fuse can be timely melted when the current is overlarge.

Referring to fig. 2 and fig. 6 to fig. 8, consider that when the connection plate 141 is fused, if the side of the tab connection region 143 facing the pole connection region 142 is closer to the edge of the pole connection region 142, the tab located on the tab connection region 143 is overlapped on the pole connection region 142 when the connection portion 144 is fused easily, so that the current conduction condition still exists on the connection plate 141. To improve this, in an embodiment of the present utility model, a relief portion 1421 is disposed on a side of the pole connection region 142 facing the hollowed-out portion 145. The shape of the avoiding portion 1421 is not limited, as long as the distance from the outer edge of the pole connection region 142 to the tab connection region 143 can be increased, so as to avoid that when the connection portion 144 is fused, the tab located near the pole connection region 142 is overlapped on the pole connection region 142, and preferably, in an embodiment of the present utility model, the avoiding portion 1421 is an arc end surface. The arc-shaped end surface increases the distance between the edge of the pole connecting region 142 and the pole lug connecting region 143 while occupying the mounting space of the pole terminal 147 as little as possible, and avoids the phenomenon that the pole lug is lapped on the pole connecting region 142 to generate electric conduction.

Referring to fig. 2 and 9, in order to avoid the situation that the first electrode lead-out member 150 and the second electrode lead-out member 160 are reversely assembled by an operator during the assembly process, in an embodiment of the present utility model, the electrode lead-out member 140 includes the first electrode lead-out member 150 and the second electrode lead-out member 160 with opposite polarities, and the weight reducing holes 146 of the first electrode lead-out member 150 and the weight reducing holes 146 of the second electrode lead-out member 160 are disposed at different positions and/or different shapes. Illustratively, the lightening hole 146 of the first electrode lead 150 extends from the hollowed-out portion 145 to a slope away from the pole connection region 142, and the lightening hole 146 of the second electrode lead 160 extends along the length direction of the tab connection region 143, and by providing different opening positions of the lightening hole 146, the situation that the first electrode lead 150 and the second electrode lead 160 are reversely assembled during the assembly process is avoided. In addition, the weight-reducing holes 146 of the first electrode lead 150 may be provided as elongated holes, the weight-reducing holes 146 of the second electrode lead 160 may be provided as circular holes, and the reverse installation may be avoided by providing different shapes of the weight-reducing holes 146. The lightening holes 146 of the first electrode lead-out member 150 and the lightening holes 146 of the second electrode lead-out member 160 can be respectively provided with different opening positions and shapes, so that an operator can quickly distinguish the polarities of the electrode lead-out members 140 by combining the positions and the shapes, and the specific arrangement mode is not limited herein, and only the polarities of the two electrode lead-out members 140 can be distinguished. Specifically, in an embodiment of the present utility model, a side of the lightening hole 146 of the first electrode lead-out member 150 facing away from the hollow portion 145 is a linear end surface, and a side of the lightening hole 146 of the second electrode lead-out member 160 facing away from the hollow portion 145 is an arc end surface. By setting the lightening holes 146 of the first electrode lead 150 and the lightening holes 146 of the second electrode lead 160 to different shapes, the operators can distinguish in time during the assembly process, and the wrong assembly is avoided.

Referring to fig. 2 and 9-11, in an embodiment of the present utility model, there is further provided an end cap assembly 130, including: the end cap body 131 and the electrode lead-out member 140 of any one of the above, the lower insulating member 132 is disposed at a side of the end cap body 131 facing the electrode assembly 120 to isolate the end cap body 131 from the electrode assembly 120, so that the two are electrically insulated. The end cover body 131 is provided with a through hole 1311, the post terminal 147 of the electrode lead-out member 140 penetrates through the lower insulating member 132 and is at least partially arranged in the through hole 1311 on the end cover body 132, and at least part of the area of the connecting plate 141 of the electrode lead-out member 140 is abutted against one side of the lower insulating member 132, which is away from the end cover body 132.

Referring to fig. 9 to 8, the shape of the lower insulating member 132 is consistent with that of the end cap body 131, and the lower insulating member 132 may be of an integral structure or a split structure assembled from various parts. Since the end cap body 131 is generally made of a metal material having a certain hardness and strength, if the end cap body 131 is directly contacted with the electrode assembly 120, the electrode assembly 120 is directly shorted, and thus, the lower insulator 132 is disposed between the end cap body 131 and the electrode assembly 120, so that the end cap body 131 and the electrode assembly 120 can be insulated. The material of the lower insulating member 132 is generally an insulating plastic.

Referring to fig. 1, 2, 9 and 10, considering that there is no limiting device between the lower insulating member 132 and the end cap body 131, when the end cap assembly 130 is assembled, the lower insulating member 132 is separated from the lower side of the end cap body 131 due to lack of limiting, so that misalignment occurs between the lower insulating member 132 and the end cap body 131. To improve this problem, in one embodiment of the present utility model, the connection plate 141 is provided with a positioning hole (not shown), and the lower insulating member 132 is provided with a positioning portion 1321 matching the weight-reducing hole 146 and/or the positioning hole. The lower insulator 132 is provided with a positioning portion 1321 protruding toward the electrode lead 140, and the positioning portion 1321 is inserted into the weight reducing hole 146 to position the lower insulator 132. Further, a positioning hole may be further formed in the tab connection region 143 of the connection plate 141, and the positioning portion 1321 on the lower insulating member 132 is adapted to the positioning hole, and when the positioning portion 1321 is mounted, the positioning portion and the positioning hole are nested and matched to realize positioning of the lower insulating member 132. Specifically, the positioning portion 1321 may have a cylindrical structure, the positioning hole is a circular hole, and the positioning hole is adapted to the positioning portion 1321, and when assembled, the positioning portion 1321 is inserted into the positioning hole at a corresponding position, so as to fix the lower insulating member 132.

Referring to fig. 9 and 11, the cap assembly 130 further includes a pressure relief mechanism 135, and the pressure relief mechanism 135 is used to relieve the internal pressure or temperature of the secondary battery 100 when the internal pressure or temperature of the secondary battery 100 reaches a predetermined value. Illustratively, the pressure relief mechanism 135 is located between the first electrode lead 150 and the second electrode lead 160, and the pressure relief mechanism 135 may be a component such as an explosion proof valve, an explosion proof piece, a gas valve, a pressure relief valve, or a safety valve.

Referring to fig. 1 and 11, the present utility model also provides a secondary battery 100. The secondary battery 100 includes a case 110, an electrode assembly 120 and the above-mentioned end cap assembly 130, the electrode assembly 120 is accommodated in the case 110, the electrode assembly 120 includes a main body portion and a tab connected to the main body portion, the end cap assembly 130 includes an end cap body 131, a lower insulating member 132 and an electrode lead-out member 140, the lower insulating member 132 is disposed at one side of the end cap body 131, and the electrode lead-out member 140 penetrates through the lower insulating member 132 and the end cap body 131 to be mounted in a sealing and insulating manner and is electrically connected with the tab of the electrode assembly 120 to lead out the current of the electrode assembly 120; the end cover body 131 is sealed at the opening of the housing 110 to form a closed battery environment with the housing 110, so as to prevent liquid or other foreign matters from affecting the normal operation of the battery.

Referring to fig. 9 and 11, in some embodiments, the shape of the end cap body 131 is adapted to the shape of the housing 110, for example, the housing 110 is a square housing 110, and the end cap body 131 is a square flat plate structure matched with the square housing. When the housing 110 is of other shapes, the shape of the end cap body 131 can be of other shapes correspondingly adapted to the housing 110. Optionally, the end cover body 131 may be made of a material with a certain hardness and strength, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., so that the end cover body 131 is not easy to deform when being extruded and collided, so that the battery can have a higher structural strength, and the safety performance can be improved.

Referring to fig. 11, the secondary battery 100 of the present utility model may be a lithium ion secondary battery 100, a sodium ion secondary battery 100, a lithium iron phosphate secondary battery 100, or the like, which is not limited in this application. The secondary battery 100 may have a cylindrical, rectangular, prismatic, or other shape, etc., and is not limited thereto in this application.

The case 110 of the secondary battery 100 includes an end wall and a side wall disposed along the circumferential direction of the end wall, with stable sealing and electrical connection therebetween, and the connection between the end wall and the side wall may be accomplished in various manners, for example, in the form of integral press molding, integral casting molding, or split welding, etc. The side walls may be square around the end walls or along any other closed loop profile that can mate with the end walls. In this embodiment, the end wall is rectangular, and the side wall is circumferentially disposed along four sides of the end wall, and a square opening is formed at one end of the side wall facing away from the end wall. The case 110 surrounded by the end walls and the side walls has a receiving chamber formed therein for receiving the electrode assembly 120, an electrolyte (not shown), and other necessary components of the battery. Specifically, the size of the case 110 may be determined according to the specific size of the electrode assembly 120. The material of the housing 110 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc., and in order to prevent the housing 110 from rusting during long-term use, a layer of rust-preventing material such as metallic nickel, etc. may be plated on the surface of the housing 110.

Referring to fig. 11, an electrode assembly 120 is received in a case 110, and the electrode assembly 120 is a component in which an electrochemical reaction occurs in the secondary battery 100. The case 110 may contain one or more electrode assemblies 120 therein. The electrode assembly 120 includes a body portion and a tab connected to the body portion, and the electrode assembly 120 is mainly formed by winding or stacking a positive electrode tab and a negative electrode tab, and a separator is generally provided between the positive electrode tab and the negative electrode tab. The positive electrode plate comprises a positive electrode current collector and a positive electrode active substance, and the positive electrode active substance is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a coated region coated with an active material and an uncoated region uncoated with an active material, and the uncoated region is wound to form a positive electrode tab of the electrode assembly 120. The negative electrode plate comprises a negative electrode current collector and a negative electrode active substance, and the negative electrode active substance is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a coated region coated with an active material and an uncoated region uncoated with the active material, and the uncoated region is wound to form a negative electrode tab of the electrode assembly 120. Taking the lithium ion secondary battery 100 as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The separator may be made of PP (polypropylene) or PE (polyethylene). In order to protect and insulate the battery cell, the insulating film can be coated outside the electrode assembly, and the insulating film can be synthesized by PP, PE, PET, PVC or other high polymer materials. The electrode assembly 120 in the present utility model includes a first tab and a second tab facing the opening of the case 110, and the first tab and the second tab are opposite in electrical property, i.e., one is a positive tab and the other is a negative tab. The end cap assembly 130 is sealed and plugged onto the opening of the case 110, and the first electrode lead 150 and the second electrode lead 160 are welded to the first tab and the second tab, respectively.

Referring to fig. 12, the present utility model further provides an electronic device 10, where the electronic device 10 includes a working portion 11 and a battery pack, and the working portion 11 is electrically connected to the battery pack to obtain power support. The battery pack includes a case and a plurality of secondary batteries 100 of the present application, the plurality of secondary batteries 100 being placed in the case in series or parallel with each other, or a mixture of series and parallel. The battery pack may include a battery pack thermal management system, a circuit board, and the like in addition to the secondary battery 100 of the present utility model, and will not be described in detail herein.

As an example, the electronic device 10 is a vehicle, which may be a fuel-oil vehicle, a gas-oil vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended range vehicle, but is not limited thereto. The working section 11 is a vehicle body, and the battery pack is provided at the bottom of the vehicle body and provides electric power support for running of the vehicle or running of electric components in the vehicle.

In other embodiments, the electronic device 10 may also be a cell phone, portable device, notebook computer, boat, spacecraft, electric toy, electric tool, and the like. Spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the working part 11 may be a unit member capable of taking electric power of the battery pack and making a corresponding work, such as a blade rotation unit of a fan, a dust suction working unit of a dust collector, and the like. The electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the present application is not particularly limited to the above-described electronic device 10.

In summary, according to the electrode lead-out piece provided by the utility model, the hollowed-out part is arranged between the two lug connection areas of the connecting plate, so that the weight of the connecting plate is greatly reduced, and the energy density of the battery cell is improved. In addition, set up the lightening hole with fretwork portion intercommunication between the utmost point ear connecting region and the utmost point post connecting region of connecting plate, and along utmost point ear connecting region length direction, the shortest distance of lightening hole to connecting plate lateral wall is less than utmost point ear connecting region width. Therefore, when the overcurrent area of the connecting plate is ensured, the battery cell can be short-circuited, under the condition of heat rise, the quick fusing between the lug connection area and the pole connection area is convenient, and the dangerous situations such as explosion and fire caused by the short circuit of the battery cell are effectively prevented. By arranging the lightening holes, the weight of the connecting plate can be further lightened, and the overcurrent protection function can be realized when the battery cells are in short circuit. In addition, the structure of the transfer piece is canceled, the connecting plate and the pole terminal are integrally formed, the welding procedure is reduced, and the production efficiency of the battery cell is improved. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. An electrode lead-out member, comprising:

the pole lug connecting device comprises a connecting plate, a pole lug and a pole lug, wherein a pole lug connecting region, a pole lug connecting region and a connecting part for connecting the pole lug connecting region and the pole lug connecting region are arranged on the connecting plate;

a post terminal disposed on the post connection region;

wherein, the connecting part is provided with a lightening hole communicated with the hollowed-out part; and along the length direction of the tab connection region, the shortest distance from the lightening hole to the side wall of the connecting plate is smaller than the width of the tab connection region.

2. The electrode lead-out member according to claim 1, wherein the lightening hole has a first side wall and a second side wall perpendicular to each other, the first side wall is formed on a side of the tab connection region facing the hollowed-out portion and parallel to an outer end surface of the tab connection region, the second side wall is formed on a side of the connection region facing the hollowed-out portion, and a distance from a side of the connection portion facing away from the hollowed-out portion to the second side wall is smaller than a distance from the outer end surface of the tab connection region to the first side wall.

3. The electrode lead-out member according to claim 2, wherein the weight-reducing hole further has a third side wall parallel to the first side wall, and the third side wall is spaced from the first side wall by a distance d ₁ The distance from the outer end surface of the tab connection region to the first side wall is d ₂ 0.1d ₂ <d ₁ <0.5d ₂ 。

4. The electrode lead-out member according to claim 1, wherein a side of the post connecting region facing the hollowed-out portion is provided with a relief portion.

5. The electrode lead-out member according to claim 1, wherein the electrode lead-out member comprises a first electrode lead-out member and a second electrode lead-out member which are opposite in polarity, and the lightening holes of the first electrode lead-out member are different in arrangement position and/or shape from the lightening holes of the second electrode lead-out member.

6. The electrode lead-out member according to claim 5, wherein a side of the lightening hole of the first electrode lead-out member facing away from the hollowed-out portion is a linear end face, and a side of the lightening hole of the second electrode lead-out member facing away from the hollowed-out portion is an arc-shaped end face.

7. An end cap assembly, comprising:

the end cover body is provided with a through hole;

the lower insulating piece is arranged on one side of the end cover body;

the electrode lead-out member according to any one of claims 1 to 6, wherein a post terminal of the electrode lead-out member penetrates through the lower insulating member and is at least partially disposed in the through hole, and at least a partial region of the connecting plate of the electrode lead-out member abuts against a side of the lower insulating member facing away from the end cap body.

8. The end cap assembly of claim 7, wherein the connecting plate is provided with a locating hole, and the lower insulator is provided with a locating portion matched with the weight reducing hole and/or the locating hole.

9. A secondary battery, characterized by comprising:

a housing;

an electrode assembly accommodated in the case, the electrode assembly including a body part and a tab connected to the body part; and

The end cap assembly according to any one of claims 7 to 8, wherein the tab of the electrode assembly is connected with the electrode lead-out member at the tab connection region, and the end cap body of the end cap assembly is covered at the opening of the case.

10. An electronic device comprising the secondary battery according to claim 9.