CN220628169U - Cover plate assembly, secondary battery and electronic device - Google Patents
Cover plate assembly, secondary battery and electronic device Download PDFInfo
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- CN220628169U CN220628169U CN202322289477.3U CN202322289477U CN220628169U CN 220628169 U CN220628169 U CN 220628169U CN 202322289477 U CN202322289477 U CN 202322289477U CN 220628169 U CN220628169 U CN 220628169U
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
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- 229910052802 copper Inorganic materials 0.000 description 5
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- 239000003792 electrolyte Substances 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
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- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model provides a cover plate assembly, a secondary battery and electronic equipment, wherein the cover plate assembly comprises a cover plate body, a lower insulating part and an electrode leading-out part, wherein the lower insulating part is arranged on one side of the cover plate body; the connecting plate comprises a terminal connecting region, a lug connecting region and a transition connecting region; the side edge of the connecting plate far away from the terminal connecting area is concave inwards to form a first hole site; at least one second hole site is arranged on the transition connection region, a fusing part is formed between the first hole site and the second hole site, and the length of the fusing part is smaller than the width of the lug connection region. When the battery core is short-circuited, the structure fuses at the fusing part after heat is increased, so that the battery core is broken, and the explosion of the battery core caused by the short circuit is prevented; the weight of the connecting plate can be reduced, and the quality energy density of the battery can be improved.
Description
Technical Field
The utility model relates to the field of batteries, in particular to an electrode lead-out piece, a cover plate assembly, a secondary battery and electronic equipment.
Background
Batteries are widely used in electronic devices such as cellular phones, notebook computers, electric vehicles, electric automobiles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like. Currently common batteries include cadmium nickel batteries, hydrogen nickel batteries, lithium ion batteries, secondary alkaline zinc manganese batteries, and the like. The lithium ion battery has the advantages of high specific energy, high specific power, long service life, low cost and the like, and becomes a main flow power battery of the new energy automobile.
In order to improve the safety performance and the installation efficiency of the battery, the traditional anode and cathode connecting sheets and ultrasonic welding protecting sheets are cancelled by welding the winding core and the cover plate of the lithium ion battery, and the winding core is directly welded on the pole bottom plate by laser through the pole lugs, so that the pole bottom plate needs to be made large. After the pole bottom plate is made big, the cross-sectional area of pole bottom plate fuse department grow, leads to the heat that the pole bottom plate fuses in electric core short circuit test great, consequently is difficult to pass short circuit test.
Disclosure of Invention
In view of the above drawbacks of the prior art, the present utility model provides a cap assembly, a secondary battery, and an electronic device to improve the problem that a post base plate is difficult to fuse due to a large cross-sectional area of a fusing part.
To achieve the above and other related objects, the present utility model provides a cap assembly, including a cap body, a lower insulating member, and an electrode lead-out member, wherein a through hole is provided in the cap body, the lower insulating member is disposed at one side of the cap body, the electrode lead-out member includes a connection plate and an electrode terminal, the electrode terminal penetrates through the lower insulating member and is at least partially disposed in the through hole, and at least a partial region of the connection plate abuts against one side of the lower insulating member facing away from the cap body; the connecting plate comprises a terminal connecting region, a tab connecting region and a transition connecting region for connecting the terminal connecting region and the tab connecting region; the side edges of the connecting plates far away from the terminal connecting areas are concave inwards to form first hole sites, and the connecting plate areas on two sides of the first hole sites form the lug connecting areas; the transition connection region is provided with at least one second hole site, the second hole site is communicated with the side edge of the connecting plate, a fusing part is formed between the first hole site and the second hole site, and the length of the fusing part is smaller than the width of the tab connection region.
In an example of the cover plate assembly of the present utility model, the transition connection regions on two sides of the terminal connection region are respectively provided with the second hole site, the second hole site is communicated with a side edge of the connection plate near the terminal connection region, and the fusing part is formed between corner apexes of the first hole site and the second hole site.
In an example of the cover plate assembly of the present utility model, a minimum distance d between the sidewall of the first hole and a center line of the terminal connection region extending in the width direction of the connection plate 1 A minimum distance d between the side wall of the second hole site and the center line of the terminal connection region extending along the width direction of the connection plate 2 。
In an example of the cover plate assembly of the present utility model, a minimum distance h from a top wall of the first hole to a center line of the terminal connection region extending along a length direction of the connection plate 1 A minimum distance h from the bottom wall of the second hole to the center line of the terminal connection area extending along the length direction of the connection plate 2 。
In an example of the cover plate assembly of the present utility model, a protrusion that mates with the second hole site is disposed on a side of the lower insulating member facing the connecting plate, and the protrusion mates with the second hole site in a nested manner.
In an example of the cover plate assembly, the cover plate assembly further comprises an upper insulating member and a sealing member, wherein the upper insulating member is sleeved on the electrode terminal and fixed on one side of the cover plate main body, which is away from the lower insulating member, and the sealing member is sleeved on the electrode terminal, which is close to the connecting plate.
In an example of the cover plate assembly of the present utility model, the cover plate assembly includes a first electrode lead and a second electrode lead, and the second hole on the first electrode lead is not interchangeable with the second hole on the second electrode lead.
In an example of the cover plate assembly of the present utility model, the second hole on the first electrode lead-out member is different in shape or arrangement position from the second hole on the second electrode lead-out member.
The utility model also provides a secondary battery, which comprises a shell, an electrode assembly and the cover plate assembly, wherein the electrode assembly is accommodated in the shell, the electrode assembly comprises a main body part and a tab connected with the main body part, the tab of the electrode assembly is connected with the electrode lead-out piece in a tab connection area, and the cover plate body of the cover plate assembly covers the opening of the shell.
The utility model also provides electronic equipment comprising the secondary battery.
The cover plate component is provided with the first hole site and the second hole site which penetrate through the connecting plate of the electrode leading-out piece along the thickness direction, and the length of the fusing part between the first hole site and the second hole site is smaller than the width of the lug connecting area. In addition, the arrangement of the first hole site and the second hole site can also reduce the weight of the connecting plate, and the quality energy density of the battery is improved.
The lower insulating part of the cover plate assembly is provided with the convex part matched with the second hole site, and the convex part is nested and matched with the second hole site, so that the lower insulating part can be prevented from being misplaced and the assembly is prevented from being influenced. Secondly, set up the recess of cavity type with the one side that the convex part deviates from the connecting plate, can realize reducing the weight to lower insulating part, set up the drain hole in the recess, can be with the quick derivation of electrolyte of inflow recess when annotating the liquid.
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 an exploded view of a cover assembly according to one embodiment of the present utility model;
FIG. 2 is a schematic view of an electrode lead-out member of a cover plate assembly according to an embodiment of the utility model;
FIG. 3 is a top view of an electrode lead-out member of a cover plate assembly according to an embodiment of the present utility model;
FIG. 4 is a side view of an electrode lead in an embodiment of a cover plate assembly of the present utility model;
FIG. 5 is an enlarged partial schematic view of area A of FIG. 4;
FIG. 6 is a top view of an electrode lead-out member of a cover plate assembly according to an embodiment of the present utility model;
FIG. 7 is a schematic cross-sectional view of FIG. 6 taken along the B-B direction;
FIG. 8 is a schematic view of a lower insulator of the cover assembly according to an embodiment of the present utility model;
FIG. 9 is a schematic diagram of the overall structure of a cover assembly according to an embodiment of the utility model;
fig. 10 is a schematic view of a structure of a secondary battery according to an embodiment of the present utility model;
fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the utility model.
Description of element reference numerals
10. An electronic device; 11. a working section; 100. a secondary battery; 110. a housing; 120. an electrode assembly; 130. a cover plate assembly; 131. a cover plate body; 132. a lower insulating member; 1321. a convex portion; 133. an upper insulating member; 134. a seal; 135. a pressure release mechanism; 140. an electrode lead; 141. a connecting plate; 1411. a terminal connection region; 1412. a tab connection region; 1413. a transition connection region; 1414. a first hole site; 1415. a second hole site; 142. an electrode terminal; 1421. an annular groove; 1422. an annular boss; 143. a first electrode lead; 144. and a second electrode lead.
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.
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.
The drawings provided in the following embodiments merely illustrate the basic idea of the present utility model by way of illustration, and only the components related to the present utility model are shown in the drawings, not according to the number, shape and size of the components in actual implementation, the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated. It should be understood that the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like are used in this specification for descriptive purposes only and not for purposes of limitation, and that the utility model may be practiced without materially departing from the novel teachings and without departing from the scope of the utility model.
In the following description, numerous details are set forth in order to provide a more thorough explanation of embodiments of the present utility model, it will be apparent, however, to one skilled in the art that embodiments of the present utility model may be practiced without these specific details, in other embodiments, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the embodiments of the present utility model.
Referring to fig. 1 to 11, the present utility model provides a cap assembly 130, a secondary battery 100, and an electronic device 10. The secondary battery 100 includes a case 110, an electrode assembly 120, and a cap plate 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 cap plate assembly 130 includes a cap plate 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 cap plate body 131, and the electrode lead-out member 140 penetrates through the lower insulating member 132 and the cap plate 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 a current of the electrode assembly 120; the cover plate 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. 1, 2 and 10, the cap assembly 130 of the present utility model includes a cap body 131, a lower insulating member 132 and an electrode lead-out member 140, wherein the lower insulating member 132 is disposed on a side of the cap body 131 facing the electrode assembly 120 to isolate the cap body 131 from the electrode assembly 120, thereby electrically insulating the two. The cover plate body 131 is provided with a through hole, the electrode lead-out member 140 comprises a connecting plate 141 and an electrode terminal 142, the electrode terminal 142 protrudes out of the surface of the connecting plate 141 and is in an integrated structure with the connecting plate 141, the electrode terminal 142 penetrates through the lower insulating member 132 and is at least partially arranged in the through hole of the cover plate body 131, and at least partial area of the connecting plate 141 is abutted against one side of the lower insulating member 132, which is away from the cover plate body 131.
Referring to fig. 2 to 5, in some embodiments, the connection plate 141 is a plate-shaped structure and is made of a conductive material, such as copper or aluminum. The connection plate 141 includes a terminal connection region 1411, a tab connection region 1412, and a transition connection region 1413 for connecting the terminal connection region 1411 and the tab connection region 1412, the terminal connection region 1411 being for connection with the electrode terminal 142, the tab connection region 1412 being for connection with a tab of the electrode assembly 120. The electrode terminal 142 is disposed at the terminal connection region 1411, and may be integrally formed with the connection plate 141, or may be formed by fixedly connecting two separate members together by welding, for example, friction welding. Further, the terminal connection region 1411 is higher than the transition connection region 1413 in the thickness direction of the connection plate 141, that is, the terminal connection region 1411 is provided with an annular boss 1422, and the electrode terminal 142 is provided on the annular boss 1422, so that the flatness of the connection surface and the reliability of welding can be ensured. The electrode terminal 142 is a solid structure made of a conductive material to ensure the overcurrent area of the electrode terminal 142 and the stability of current transmission. The electrode terminal 142 may be provided in a column-shaped structure to facilitate connection with an external electronic device or a charging device. The end surface of the electrode terminal 142 facing away from the connection plate 141 is recessed to form a recess for connection with an electrical consumer or a charging device. Threads can be arranged on the inner wall of the concave part, so that convenience of connection is improved. The electrode terminal 142 may be made of a metal material having a certain strength, and further, the electrode terminal 142 is made of a metal including aluminum, such as an aluminum alloy, or the like. When the electrode lead 140 is a negative electrode lead, the electrode terminal 142 and the connection plate 141 are made of different materials, for example, the electrode terminal 142 is made of an aluminum alloy, and the connection plate 141 is made of a copper material; when the electrode lead 140 is a positive electrode lead, the electrode terminal 142 and the connection plate 141 are made of the same material, for example, an aluminum alloy.
Referring to fig. 2 and 3, the terminal connection region 1411 is disposed on one side of the connection plate 141, and the side edge of the connection plate 141 away from the terminal connection region 1411 is concaved inward to form a first hole 1414, so that the connection plate 141 regions on both sides of the first hole 1411 form a tab connection region 1412, and the transition connection region 1413 is located in the transition region between the terminal connection region 1411 and the tab connection region 1412. At least one second hole 1415 is formed in the transitional connection area 1413, the second hole 1415 is communicated with the side edge of the connection plate 141, and at this time, a fusing part is formed in a region between the first hole 1414 and the second hole 1415. It should be noted that, the first hole 1414 and the second hole 1415 penetrate along the thickness direction of the connection plate 141, the length of the fusing part is denoted as C, and the width of the tab connection region 1412 is denoted as a, so that the length C of the fusing part is smaller than the width a of the tab connection region 1412. Furthermore, the arrangement of the first hole 1414 and the second hole 1415 can also reduce the weight of the connection plate 141 and improve the mass energy density of the battery.
Referring to fig. 3 and 6, in an embodiment, the transition connection regions 1413 on both sides of the terminal connection region 1411 are provided with second hole sites 1415, and the second hole sites 1415 are penetrated with the side edges of the connection plate 141 near the terminal connection region 1411. The first hole 1414 is provided at a position apart from the terminal connection region 1411 in the connection plate 141 between the second hole 1415 on both sides. The shapes of the first hole 1414 and the second hole 1415 are not limited, and in some embodiments, the first hole 1414 and the second hole 1415 may be polygonal, for example, the first hole 1414 and the second hole 1415 are both U-shaped holes, and the U-shaped openings of the first hole 1414 and the second hole 1415 face opposite directions, so that the area between the angular vertices of the first hole 1414 and the second hole 1415 forms a fuse.
Referring to fig. 3, in one embodiment, the bottom wall of the second hole 1415 is higher than the top wall of the first hole 1414, and specifically, the center position of the terminal connection area 1411 is denoted as an origin O, and a center line extending along the length direction of the connection plate 141 and passing through the origin O is denoted as m 1 The center line passing through the origin O and extending in the width direction of the connection plate 141 is denoted as m 2 Top wall of first hole 1414 is located at center line m 1 The minimum distance of (2) is denoted as h 1 Side of the first hole 1414 to the center line m 2 The minimum distance of (2) is denoted as d 1 The bottom wall of the second hole 1415 extends to the center line m 1 The minimum distance of (2) is denoted as h 2 Sidewall of the second hole 1415 extends to a center line m 2 The minimum distance of (2) is denoted as d 2 Then, h 1 ＜h 2 ，d 1 ＞d 2 。
Referring to fig. 1 and 10, in some embodiments, the shape of the cover body 131 is adapted to the shape of the housing 110, for example, the housing 110 is a square housing, and the cover body 131 is a square flat plate structure matched with the square housing. When the housing 110 has other shapes, the shape of the cover body 131 can be other shapes corresponding to the housing 110. Optionally, the 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 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. 1 and 8, the shape of the lower insulating member 132 is consistent with that of the cover body 131, and the lower insulating member 132 may be an integral structure or a split structure assembled by various components. Since the cap body 131 is generally made of a metal material having a certain hardness and strength, if the 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 cap body 131 and the electrode assembly 120, so that the 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, 8 and 9, since there is no limiting device between the lower insulating member 132 and the cover plate body 131, the lower insulating member 132 is easily dislocated during the assembly process of the cover plate assembly 130, and is out of the cover plate body 131, which affects the assembly accuracy and the assembly efficiency. The application is provided with a convex part 1321 matched with the second hole site 1415 on one side of the connecting plate 141 of the lower insulating part 132 facing the electrode lead-out part 140, and the convex part 1321 is in nested matching with the second hole site 1415 on the connecting plate 141 so as to realize the positioning of the lower insulating part 132 and prevent deviation. The shape of the convex portion 1321 is not limited here, and it is only necessary to match the shape of the second hole 1415. For example, the second hole 1415 is a U-shaped hole, the convex portion 1321 is a square convex portion matching with the second hole, and the width of the square convex portion is equal to or smaller than the width of the U-shaped hole; if the second hole 1414 has another structure, the convex portion 1321 has another structure matching the other structure. It should be noted that, the dimensions of the protruding portion 1321 are not only required to achieve the positioning of the lower insulating member 132, but also not to affect the mating relationship between the components of the cover assembly 130, so the dimensions of the protruding portion 1321 need to satisfy the following relationship: let h be the height of the protruding portion 1321, d be the depth of the second hole 1414, and b be the gap between the transition area 1413 and the lower insulator 132, where b is the gap generated during the actual assembly process, and preferably b=0.
Referring to fig. 1 and 8, preferably, a side of the protrusion 1321 facing the cover body 131 is configured as a groove, that is, the protrusion 1321 includes a bottom and a side, wherein the side is connected to the lower insulating member 132 and extends in a direction away from the cover body 131, and the bottom is connected to a side of the side away from the cover body 131. The provision of the groove-like convex portion 1321 can play a role in weight reduction of the lower insulator 132. The protruding portion 1321 may be integrally injection-molded with the lower insulator 132, or may be machined after the lower insulator 132 is molded. Further, in order to prevent the electrolyte from being partially stored in the groove of the convex portion 1321 when the battery is filled, a liquid guiding hole is provided on the convex portion 1321 to flow the electrolyte in the groove out of the liquid guiding hole, and the liquid guiding hole may be provided at the bottom of the convex portion, or may be provided at the side portion, or may be provided at both the bottom and the side portion.
Referring to fig. 1, 5 and 7, the cap assembly 100 further includes an upper insulator 133 and a seal 134, the upper insulator 133 and the seal 134 separate and insulate the electrode terminal 142 of the electrode lead 140 from the cap body 131, and the upper insulator 133 and the seal 134 may be made of rubber or other insulating materials. Specifically, the upper insulating member 133 is sleeved at a portion of the electrode terminal 142 extending out of the cover body 131, and is fixed on a side of the cover body 131 facing away from the lower insulating member 132. Preferably, the upper insulator 133 is engaged with the electrode terminal 142 around the circumferential direction of the electrode terminal 142. For example, an annular groove 1421 is formed in the outer periphery of the top of the electrode terminal 142 extending out of the cap body 131, and a positioning ring protruding in the radial direction is formed on the inner side wall of the upper insulator 133, and when the upper insulator 133 is mounted, the positioning ring is embedded in the annular groove 1421, thereby positioning the upper insulator 133 and the electrode lead-out 140. The sealing element 134 is sleeved at a position of the electrode terminal 142 close to the connecting plate 141, for example, an annular boss 1422 protruding from the electrode terminal 142 is arranged at a connection position of the electrode terminal 142 and the connecting plate 141, and the sealing element 134 is sleeved on the annular boss 1422.
Referring to fig. 1, in an embodiment, the cover assembly 130 includes two electrode lead-out members with opposite polarities, which are respectively denoted as a first electrode lead-out member 143 and a second electrode lead-out member 144, the first electrode lead-out member 143 is connected to the positive electrode tab of the electrode assembly 120, and the second electrode lead-out member 144 is connected to the negative electrode tab of the electrode assembly 120. The first electrode lead 143 and the second electrode assembly 144 may be disposed at the same end of the battery or may be disposed at different ends, specifically determined by the tab of the electrode assembly 120. If the positive electrode tab and the negative electrode tab are distributed at the same end of the electrode assembly 120, the first electrode lead 143 and the second electrode lead 144 are located at the same end of the battery; if the positive electrode tab and the negative electrode tab are disposed at different ends of the electrode assembly, the first electrode lead 143 and the second electrode lead 144 are disposed at different ends of the battery, corresponding to the positive electrode tab and the negative electrode tab. In this application, the positive electrode tab and the negative electrode tab are disposed at the same end of the electrode assembly 120, and thus, the first electrode lead 143 and the second electrode lead 144 are disposed at the same end of the battery.
Referring to fig. 1 and 2, specifically, two ends of the cover body 131 are respectively provided with a first through hole for passing through the electrode terminals 142 of the first electrode lead-out member 143 and the second electrode lead-out member 144, and two ends of the lower insulating member 132 are correspondingly provided with a second through hole for passing through the electrode terminals 142 of the first electrode lead-out member 143 and the second electrode lead-out member 144. The electrode terminals 142 of the first and second electrode lead-out members 143 and 144 sequentially pass through the second and first through holes and are sealed and insulated on the cap plate body 131 by the upper insulating member 133, and the connection plates of the first and second electrode lead-out members 143 and 144 respectively abut against one sides of the lower insulating member 132 facing away from the cap plate body 131. The lower insulator 132 is provided with a convex portion 1321 at a position corresponding to the connecting plate of the first electrode lead-out member 143 and the connecting plate of the second electrode lead-out member 144, so that the positioning effect is better.
Referring to fig. 1, in order to prevent the first electrode lead 143 and the second electrode lead 144 from being connected reversely, in an embodiment, the second holes 1415 on the two electrode lead connecting plates 141 are configured not to be interchangeable, that is, the positions or shapes of the second holes 1415 on the connecting plates 141 to which the first electrode lead 143 and the second electrode lead 144 are connected are different, and the first electrode lead 143 and the second electrode lead 144 can be distinguished by the shapes or positions. Specifically, the second hole 1415 of the first electrode lead 143 has a first shape, and the second hole 1415 of the second electrode lead 144 has a second shape, and the first shape is different from the second shape. For example, the first shape is a U-shaped hole and the second shape is a polygonal hole; the second hole 1415 of the first electrode lead 143 is disposed at a first position of the connection plate 141, the second hole 1415 of the second electrode lead 144 is disposed at a second position of the connection plate 141, and the first position and the second position are respectively disposed at different positions of the transition connection region 1413; and the like, is not limited herein, and only the polarities of the two electrodes need to be discriminated.
Referring to fig. 1 and 10, the cap plate 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 143 and the second electrode lead 144, 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. 10, the secondary battery 100 of the present utility model may be a lithium ion secondary battery, a sodium ion secondary battery, a lithium iron phosphate secondary battery, 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. 10, 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 the active material, and the uncoated region is wound to form a positive electrode tab of the electrode assembly. 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. Taking a lithium ion secondary battery 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). To protect and insulate the battery cell, the electrode assembly 120 may be covered with an insulating film, which may be made of 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, 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 cover assembly 130 is sealed and plugged on the opening of the housing 110, and the first electrode lead-out piece 143 and the second electrode lead-out piece 144 are respectively connected with the first tab and the second tab in a welding manner.
Referring to fig. 11, an electronic device 10 provided by the present utility model includes a working portion 11 and a battery pack, wherein 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 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 may be a unit part capable of taking the electric power of the battery pack and making a corresponding work, such as a blade rotating 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 application does not particularly limit the electronic device.
The cover plate component is provided with the first hole site and the second hole site which penetrate through the connecting plate of the electrode leading-out piece along the thickness direction, and the length of the fusing part between the first hole site and the second hole site is smaller than the width of the lug connecting area. And the weight of the connecting plate can be reduced, and the quality energy density of the battery can be improved. The lower insulating piece is provided with the convex part matched with the second hole site, and the convex part is nested and matched with the second hole site, so that the lower insulating piece can be prevented from being misplaced, and the assembly is prevented from being influenced. In addition, set up the recess of cavity type with the one side that the convex part deviates from the connecting plate, can realize reducing the weight to lower insulating part, set up the drain hole in the recess, can be with the quick derivation of electrolyte of inflow recess when annotating the liquid. 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 (10)
1. A cover plate assembly, comprising:
the cover plate body is provided with a through hole;
the lower insulating piece is arranged on one side of the cover plate body; and
The electrode lead-out piece comprises a connecting plate and an electrode terminal, the electrode terminal penetrates through the lower insulating piece and is at least partially arranged in the through hole, and at least a partial area on the connecting plate is abutted with one side, away from the cover plate body, of the lower insulating piece;
the connecting plate comprises a terminal connecting region, a tab connecting region and a transition connecting region for connecting the terminal connecting region and the tab connecting region; the side edges of the connecting plates far away from the terminal connecting areas are concave inwards to form first hole sites, and the connecting plate areas on two sides of the first hole sites form the lug connecting areas;
the transition connection region is provided with at least one second hole site, the second hole site is communicated with the side edge of the connecting plate, a fusing part is formed between the first hole site and the second hole site, and the length of the fusing part is smaller than the width of the tab connection region.
2. The cover plate assembly according to claim 1, wherein the transition connection regions on both sides of the terminal connection region are respectively provided with the second hole sites, and the second hole sites penetrate through side edges of the connection plate near the terminal connection region, and the fusing part is formed between corner apexes of the first hole sites and the second hole sites.
3. The cover plate assembly of claim 1, wherein a minimum distance d from a sidewall of the first hole site to a centerline of the terminal connection region extending in a width direction of the connection plate 1 A minimum distance d between the side wall of the second hole site and the center line of the terminal connection region extending along the width direction of the connection plate 2 。
4. The cover plate assembly of claim 1 wherein the top wall of the first hole location is at a minimum distance h from a centerline of the terminal connection region extending along the length of the connection plate 1 A minimum distance h from the bottom wall of the second hole to the center line of the terminal connection area extending along the length direction of the connection plate 2 。
5. The cover plate assembly of claim 1, wherein a side of the lower insulator facing the connection plate is provided with a protrusion that mates with the second hole site, the protrusion nesting with the second hole site.
6. The cover plate assembly according to claim 1, further comprising an upper insulator and a sealing member, wherein the upper insulator is sleeved on the electrode terminal and fixed on a side of the cover plate body away from the lower insulator, and the sealing member is sleeved on the electrode terminal at a position close to the connecting plate.
7. The cover plate assembly of claim 1, wherein the cover plate assembly comprises a first electrode lead and a second electrode lead, the second hole on the first electrode lead being non-interchangeable with the second hole on the second electrode lead.
8. The cover plate assembly of claim 7, wherein the second hole location on the first electrode lead-out is shaped differently or positioned differently than the second hole location on the second electrode lead-out.
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 cover plate assembly according to any one of claims 1 to 8, wherein the tab of the electrode assembly is connected with the electrode lead-out member at a tab connection region, and a cover plate body of the cover plate assembly is covered at an opening of the housing.
10. An electronic device comprising the secondary battery according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322289477.3U CN220628169U (en) | 2023-08-24 | 2023-08-24 | Cover plate assembly, secondary battery and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322289477.3U CN220628169U (en) | 2023-08-24 | 2023-08-24 | Cover plate assembly, secondary battery and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220628169U true CN220628169U (en) | 2024-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322289477.3U Active CN220628169U (en) | 2023-08-24 | 2023-08-24 | Cover plate assembly, secondary battery and electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220628169U (en) |
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2023
- 2023-08-24 CN CN202322289477.3U patent/CN220628169U/en active Active
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