CN220628171U - End cap assembly, secondary battery, and electronic device - Google Patents
End cap assembly, secondary battery, and electronic device Download PDFInfo
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- CN220628171U CN220628171U CN202322296288.9U CN202322296288U CN220628171U CN 220628171 U CN220628171 U CN 220628171U CN 202322296288 U CN202322296288 U CN 202322296288U CN 220628171 U CN220628171 U CN 220628171U
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- 239000000178 monomer Substances 0.000 abstract description 3
- 230000000630 rising effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 230000001603 reducing effect Effects 0.000 description 7
- 238000004880 explosion Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000011149 active material Substances 0.000 description 4
- 239000013543 active substance Substances 0.000 description 4
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000006183 anode active material Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- 239000013585 weight reducing agent Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
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- 230000002441 reversible effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
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- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 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
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides an end cap assembly, a secondary battery and an electronic device, wherein the end cap assembly comprises: an end cap body and an electrode lead; the electrode lead-out piece comprises a connecting plate and a pole terminal, the connecting plate is positioned on one side of the end cover body, a pole connection region, a pole lug connection region and a connection part for connecting the pole lug connection region and the pole lug connection region are arranged on the connecting plate, a hollowed-out part is arranged between at least two pole lug connection regions on the connecting plate, the pole terminal is arranged on the pole lug connection region, and at least part of the pole terminal penetrates through the end cover body; wherein, offered the heavy groove that subtracts on the connecting portion, the length direction that subtracts heavy groove along the utmost point ear connecting region extends, and the cross-sectional area of connecting portion along subtracting heavy groove extending direction is less than the cross-sectional area of utmost point ear connecting region along end cover body width direction. 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
Technical Field
The utility model relates to the technical field of batteries, in particular to 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 cover plate, 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, and therefore the electric connection of the winding core and the cover plate 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 larger, so that the heat required by fusing the pole bottom plate is larger in the cell short circuit test, the pole bottom plate is difficult to quickly dissolve, and the short circuit test is difficult to pass. Accordingly, it is desirable to provide an end cap assembly, a secondary 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 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 battery cell is shorted in the prior art.
To achieve the above and other related objects, the present utility model provides an end cap assembly comprising: the electrode lead-out piece comprises a connecting plate and a pole terminal, wherein the connecting plate is positioned on one side of the end cover body, a pole 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 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 lug connecting region, and the pole terminal at least partially penetrates through the end cover body; the connecting part is provided with a weight-reducing groove, the weight-reducing groove extends along the length direction of the lug connecting area, and the cross section area of the connecting part along the extending direction of the weight-reducing groove is smaller than the cross section area of the lug connecting area along the width direction of the end cover body.
In an embodiment of the present utility model, the weight-reducing groove is communicated with the hollow portion and penetrates through the connecting portion along the length direction of the end cover body.
In an embodiment of the present utility model, the tab connection region has a width d 2 The thickness of the tab connection region is h 2 Along the thickness direction of the tab connection region, the depth of the groove of the weight-reducing groove on the connection portion is h 1 The slotting length of the weight-reducing slot is d 1 D is then 1 *(h 2 -h 1 )<d 2 *h 2 。
In an embodiment of the utility model, the weight-reducing groove is formed on one side of the connecting portion facing toward and/or facing away from the end cover body.
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 groove on the first electrode lead-out member is different from the weight-reducing groove on the second electrode lead-out member in shape and/or in arrangement position.
In an embodiment of the present utility model, the weight-reducing groove on the first electrode lead-out member penetrates the connection portion along the length direction of the tab connection region, the weight-reducing groove on the second electrode lead-out member extends along the length direction of the tab connection region, and the length of the weight-reducing groove on the second electrode lead-out member is smaller than the length of the connection portion.
In an embodiment of the utility model, a positioning hole is formed in the connecting plate, a lower insulating member is arranged between the end cover body and the connecting plate, the connecting plate is abutted against one side of the lower insulating member, which is away from the end cover body, and a positioning part matched with the positioning hole is arranged on the lower insulating member.
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 comprises an electrode assembly body, an electrode lead-out piece, an electrode lug connecting area, an end cover body and an end cover body, wherein the electrode lug of the electrode assembly body is connected with the electrode lead-out piece in the electrode lug connecting area, and the end cover body of the end cover assembly body covers 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 present utility model provides an end cap assembly, a secondary battery and an electronic device, wherein a connection plate of the end cap assembly is provided with a pole connection region and a tab connection region, and the pole connection region and the tab connection region are connected by a connection portion. The connecting part is provided with a weight-reducing groove extending along the length direction of the lug connecting area, and the cross section area of the connecting part along the extending direction of the weight-reducing groove is smaller than the cross section area of the lug connecting area along the width direction of the end cover body. Therefore, when the battery cell is short-circuited, the connecting part can be quickly fused, so that the current conduction of the connecting plate is cut off, and dangerous situations such as explosion and fire caused by the short circuit of the battery cell are effectively prevented. By arranging the weight reduction groove, the weight of the connecting plate can be reduced, and the overcurrent protection function can be realized when the battery cell is in short circuit. In addition, a hollowed-out part is further arranged between the two lug connection areas, so that the weight of the connecting plate is further reduced, and the energy density of the battery monomer is effectively improved.
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 an end cap assembly according to one embodiment of the present utility model;
FIG. 2 is a schematic diagram of an end cap assembly according to an embodiment of the utility model;
FIG. 3 is a top view of an end cap assembly according to one embodiment of the present utility model;
FIG. 4 is a top view of an end cap assembly according to another embodiment of the present utility model;
FIG. 5 shows a cross-sectional view of FIG. 4 along the direction B-B;
FIG. 6 is a side view of FIG. 3;
FIG. 7 shows a partial enlarged view of area A of FIG. 6;
FIG. 8 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. 9 is a cross-sectional view taken along the direction D-D in FIG. 8;
FIG. 10 is a side view of FIG. 8;
FIG. 11 is an enlarged view of a portion of region C of FIG. 10;
FIG. 12 is a schematic view of an end cap assembly according to another embodiment of the present utility model;
FIG. 13 is a top view of an end cap assembly according to another embodiment of the present utility model;
FIG. 14 is a schematic view of the overall structure of an end cap assembly according to an embodiment of the present utility model;
fig. 15 is a schematic view showing the structure of a secondary battery according to an embodiment of the present utility model;
fig. 16 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; 144. a connection part; 145. a hollowed-out part; 146. a weight reduction groove; 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 16. 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 16, the present utility model provides an end cap assembly 130, a secondary battery 100, and an electronic device 10. The connecting part 144 is arranged between the lug connecting area 143 and the pole connecting area 142 of the connecting plate 141, the connecting part 144 is provided with the weight reducing groove 146 extending along the length direction of the lug connecting area 143, and the cross section area of the connecting part 144 along the extending direction of the weight reducing groove 146 is smaller than the cross section area of the lug connecting area 143 along the width direction of the end cover body 131.
Referring to fig. 1, 2 and 13, in one embodiment of the utility model, the end cap assembly 130 comprises: an end cap body 131 and an electrode lead 140. The electrode lead 140 includes a connection plate 141 and a tab terminal 147, the connection plate 141 being located at a side of the end cap body 131 facing the electrode assembly 120, the connection plate 141 being 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 regions 143 are symmetrically distributed at both sides of the tab connection regions 142 along the length or width direction of the tab connection regions 142, and at least a portion of the tab connection regions 143 are welded to tabs led out of the electrode assembly 120 toward one side of the electrode assembly 120. The post terminal 147 is disposed on the post connecting region 142 and passes through the through hole 1311 of the end cap body 131, at least partially through the end cap body 131. A hollowed-out portion 145 is formed between at least two tab connection areas 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.
Referring to fig. 1 to 3, at least a portion of the tab connection region 142 is connected to a tab terminal 147, and at least a portion of the tab connection region 143 is electrically connected to a tab of the motor assembly by welding. Specifically, the pole terminal 147 is integrally formed on the pole connection region 142, and the pole terminal 147 at least partially penetrates the end cap body 131. The connecting portion 144 of the connecting plate 141 is provided with a weight-reducing groove 146 and extends along the length direction of the tab connecting region 143, and the cross-sectional area of the connecting portion 144 along the extending direction of the weight-reducing groove 146 is smaller than the cross-sectional area of the tab connecting region 143 along the width direction of the end cover body 131. By providing the weight-reducing groove 146 on the connecting plate 141, the weight of the connecting plate 141 can be effectively reduced, the cross-sectional area of the connecting portion 144 can be greatly reduced, and when the current flowing through the connecting portion 144 is too large, the connecting portion 144 can generate more heat, and a local overheat fusing phenomenon is easy to occur. Therefore, the region where the tab connection region 143 and the pole connection region 142 are communicated is easier to break, the short circuit test of the battery cell is facilitated, and the electrical safety is protected. The problems of fire explosion and the like caused by short circuit of the battery are effectively prevented, and overcurrent protection of the connecting plate 141 is realized.
Referring to fig. 1, 2 and 4, in order to minimize the cross-sectional area of the connecting portion 144, in an embodiment of the utility model, the weight-reducing groove 146 is communicated with the hollow portion 145 and penetrates the connecting portion 144 along the length direction of the end cover body 131. Along the length direction of the tab connection region 143, the length of the weight-reducing groove 146 is the same as the length of the connection portion 144. By setting the length of the weight-reducing groove 146 and the length of the connecting portion 144 to be the same, the cross-sectional area of the connecting portion 144 can be reduced to the maximum extent without affecting the flow area of the connecting plate 141, and the weight of the connecting plate 141 can be reduced together with the hollowed-out portion 145.
Referring to fig. 2 to 6, in order to perform an overcurrent protection function on the connection plate 141, it is required that the connection portion 144 is first fused when an excessive current flows through the connection plate 141. Therefore, in one embodiment of the present utility model, the tab connection region 143 has a width d 2 The tab connection region 143 has a thickness h 2 When the weight-reducing grooves 146 are not formed, the thickness of the connection portion 144 is the same as that of the tab connection region 143, and h is the same as that of the tab connection region 2 . The depth h of the groove 146 on the connecting portion 144 is the thickness direction of the tab connecting region 143 1 The length of the weight-reducing groove 146 is d 1 D is then 1 *(h 2 -h 1 )<d 2 *h 2 . Since the depth of the groove 146 is smaller than the thickness of the connecting portion 144, the connecting portion 144 provided with the groove 146 has a residual thickness h in the thickness direction of the connecting plate 141 2 -h 1 . Therefore, the cross-sectional area of the connecting portion 144 along the extending direction of the weight-reducing groove 146 is d 1 *(h 2 -h 1 ). And the cross-sectional area of the tab connection region 143 in the thickness direction thereof is d 2 *h 2 . Thus (2)Compared with the prior art, after the weight-reducing groove 146 is formed, the cross-sectional area of the connecting portion 144 is reduced, and the cross-sectional area of the connecting portion 144 is smaller than the cross-sectional area of the tab connecting region 143 along the extending direction of the weight-reducing groove 146, so that the current density flowing through the connecting portion 144 is greater. Therefore, under the same current condition, the heat generated at the connection portion 144 is higher, and when the current is too large, the connection portion 144 is fused first, so that the electrical safety is protected, and the short circuit test of the battery cell is facilitated.
Referring to fig. 1, 2, and 5-7, in an embodiment of the utility model, a weight-reducing groove 146 is formed on a side of the connecting portion 144 facing toward and/or away from the end cap body 131. Wherein the weight-reducing groove 146 is a blind groove, i.e. the grooving depth of the weight-reducing groove 146 is smaller than the thickness of the connecting plate 141. The concrete slotting mode is not limited, so long as the weight reducing effect can be achieved, and meanwhile, when the current is too large, the connecting portion 144 can be conveniently and rapidly broken. Illustratively, the weight-reducing groove 146 may be formed on a side of the connecting portion 144 facing the end cover body 131, the weight-reducing groove 146 may be formed on a side of the connecting portion 144 facing away from the end cover body 131, and the weight-reducing groove 146 may be formed on both a side of the connecting portion 144 facing the end cover body 131 and a side of the connecting portion 144 facing away from the end cover body 131.
Referring to fig. 2 and fig. 8 to fig. 11, 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. 1 and 2, 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 grooves 146 of the first electrode lead-out member 150 and the weight reducing grooves 146 of the second electrode lead-out member 160 are disposed at different positions and/or different shapes. Illustratively, the weight-reducing grooves 146 of the first electrode lead-out member 150 are formed on the side of the connecting portion 144 facing toward and away from the end cover body 131, and the weight-reducing grooves 146 of the second electrode lead-out member 160 are formed on the side of the connecting portion 144 facing toward the end cover body 131, so that the situation that the first electrode lead-out member 150 and the second electrode lead-out member 160 are reversely assembled in the assembling process is avoided by arranging different opening positions of the weight-reducing grooves 146. In addition, the length of the slot of the weight-reducing groove 146 of the first electrode lead-out member 150 may be set to be the same as the length of the connection portion 144, and the length of the slot of the weight-reducing groove 146 of the second electrode lead-out member 160 may be set to be smaller than the length of the connection portion 144, so that the reverse installation may be avoided by providing different shapes of the weight-reducing groove 146. The weight reducing grooves 146 of the first electrode lead-out member 150 and the weight reducing grooves 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.
Referring to fig. 1, 2 and 12, in particular, in an embodiment of the utility model, the weight-reducing groove 146 on the first electrode lead-out member 150 penetrates the connection portion 144 along the length direction of the tab connection region 143, the weight-reducing groove 146 on the second electrode lead-out member 160 extends along the length direction of the tab connection region 143, and the length of the weight-reducing groove 146 on the second electrode lead-out member 160 is smaller than the length of the connection portion 144. Because the length of the weight-reducing groove 146 is different, an operator can quickly distinguish between the first electrode lead 150 and the second electrode lead 160, avoiding mis-assembly.
Referring to fig. 1, 2, 5 and 13, when the length of the weight-reducing slot 146 is smaller than the length of the connecting portion 144, the width of the tab connection region 143 is d 2 The tab connection region 143 has a thickness h 2 When the weight-reducing grooves 146 are not formed, the thickness of the connection portion 144 is the same as that of the tab connection region 143, and h is the same as that of the tab connection region 2 . The depth h of the groove 146 on the connecting portion 144 is the thickness direction of the tab connecting region 143 1 The length of the weight-reducing groove 146 is d 3 The length of the connecting portion 144 is d 1 . The cross-sectional area of the connecting portion 144 along the extending direction of the weight-reducing groove 146 is: (d) 1 -d 3 )*h 2 +d 3 *(h 2 -h 1 ). From the foregoing, it is necessary to ensure that the cross-sectional area of the connection portion 144 along the extending direction of the weight-reducing slot 146 is smaller than that of the tab connection region. Therefore, the two needs to meet the following conditions: (d) 1 -d 3 )*h 2 +d 3 *(h 2 -h 1 )<d 2 *h 2 。
Referring to fig. 1, 2 and 14, in an embodiment of the utility model, a positioning hole is formed on a connecting plate 141, a lower insulating member 132 is disposed between the end cover body 131 and the connecting plate 141, the connecting plate 141 abuts against a side of the lower insulating member 132 facing away from the end cover body 131, and a positioning portion 1321 matching the positioning hole is formed on the lower insulating member 132. Illustratively, a positioning hole is formed in the tab connection region 143, and the positioning portion 1321 is adapted to the positioning hole, so that the positioning of the lower insulating member 132 is achieved by inserting the positioning portion 1321 into the positioning hole.
Referring to fig. 1 and 14, 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 an integral structure or a split structure assembled by various components. 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 and 15, 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, 2 and 15, 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. 1 and 15, in some embodiments, the shape of the end cover body 131 is adapted to the shape of the housing 110, for example, the housing 110 is a square housing 110, and the end cover 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. 15, 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.
With continued reference to fig. 15, the case 110 of the secondary battery 100 includes an end wall and a side wall disposed circumferentially of the end wall, with a stable sealing and electrical connection therebetween, and the connection between the end wall and the side wall may be achieved in various manners, such as in the form of integral stamping, integral casting, or split welding. 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. 1 and 15, 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. 15 and 16, 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, the utility model provides an end cover assembly, a secondary battery and an electronic device, wherein a pole connection region and a tab connection region are arranged on a connection plate of the end cover assembly, and the pole connection region and the tab connection region are connected through a connection part. The connecting part is provided with a weight-reducing groove extending along the length direction of the lug connecting area, and the cross section area of the connecting part along the extending direction of the weight-reducing groove is smaller than the cross section area of the lug connecting area along the width direction of the end cover body. Therefore, when the battery cell is short-circuited, the connecting part can be quickly fused, so that the current conduction of the connecting plate is cut off, and dangerous situations such as explosion and fire caused by the short circuit of the battery cell are effectively prevented. By arranging the weight reduction groove, the weight of the connecting plate can be reduced, and the overcurrent protection function can be realized when the battery cell is in short circuit. In addition, a hollowed-out part is further arranged between the two lug connection areas, so that the weight of the connecting plate is further reduced, and the energy density of the battery monomer is effectively 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 (10)
1. An end cap assembly, comprising:
an end cap body;
the electrode lead-out piece comprises a connecting plate and a pole terminal, wherein the connecting plate is positioned on one side of the end cover body, a pole 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 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 lug connecting region, and the pole terminal at least partially penetrates through the end cover body;
the connecting part is provided with a weight-reducing groove, the weight-reducing groove extends along the length direction of the lug connecting area, and the cross section area of the connecting part along the extending direction of the weight-reducing groove is smaller than the cross section area of the lug connecting area along the width direction of the end cover body.
2. The end cap assembly of claim 1, wherein the weight-reducing slot is in communication with the hollowed-out portion and extends through the connecting portion along a length of the end cap body.
3. The end cap assembly of claim 2 wherein said tab connection region has a width d 2 The thickness of the tab connection region is h 2 Along the thickness direction of the tab connection region, the depth of the groove of the weight-reducing groove on the connection portion is h 1 The slotting length of the weight-reducing slot is d 1 Then
d 1 *(h 2 -h 1 )<d 2 *h 2 。
4. The end cap assembly of claim 1, wherein the weight-reducing slot is open on a side of the connecting portion facing toward and/or away from the end cap body.
5. The end cap assembly of claim 1, wherein a side of the pole connection region facing the hollowed-out portion is provided with a relief portion.
6. The end cap assembly of claim 1, wherein the electrode lead-out comprises a first electrode lead-out and a second electrode lead-out of opposite polarity, wherein the weight-reducing groove on the first electrode lead-out is shaped differently and/or positioned differently than the weight-reducing groove on the second electrode lead-out.
7. The end cap assembly of claim 6, wherein the weight-reducing groove on the first electrode lead-out member extends through the connection portion along a length of the tab connection region, the weight-reducing groove on the second electrode lead-out member extends along a length of the tab connection region, and the length of the weight-reducing groove on the second electrode lead-out member is less than the length of the connection portion.
8. The end cover assembly of claim 1, wherein the connecting plate is provided with a positioning hole, a lower insulating member is arranged between the end cover body and the connecting plate, the connecting plate is abutted against one side of the lower insulating member, which is away from the end cover body, and the lower insulating member is provided with a positioning part matched with the positioning 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 1 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 housing.
10. An electronic device comprising the secondary battery according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322296288.9U CN220628171U (en) | 2023-08-24 | 2023-08-24 | End cap assembly, secondary battery, and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322296288.9U CN220628171U (en) | 2023-08-24 | 2023-08-24 | End cap assembly, secondary battery, and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220628171U true CN220628171U (en) | 2024-03-19 |
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ID=90232038
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322296288.9U Active CN220628171U (en) | 2023-08-24 | 2023-08-24 | End cap assembly, secondary battery, and electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220628171U (en) |
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2023
- 2023-08-24 CN CN202322296288.9U patent/CN220628171U/en active Active
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