CN209626264U - Secondary cell - Google Patents
Secondary cell Download PDFInfo
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- CN209626264U CN209626264U CN201920415323.5U CN201920415323U CN209626264U CN 209626264 U CN209626264 U CN 209626264U CN 201920415323 U CN201920415323 U CN 201920415323U CN 209626264 U CN209626264 U CN 209626264U
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- switching piece
- top cover
- secondary cell
- tab
- recessed portion
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- 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
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Abstract
The embodiment of the present application provides secondary cell, and the secondary cell includes: top cover, is equipped with mounting hole；Electric connecting part, including pole and switching piece, pole pass through mounting hole, and connection sheet is located at below top cover and is electrically connected with pole；Electrode assembly, including ontology and tab, tab extend at the top of ontology, and tab includes interconnecting piece, and connecting portion is fixedly connected in the lower section of switching piece, and with switching piece；Wherein, the bottom of top cover is provided with recessed portion, has gap between short transverse, the bottom wall and switching piece of recessed portion.The lower section of top cover is switching piece and tab, after recessed portion is arranged in top cover, in the position of recessed portion, top cover is not contacted with switching piece and tab, to reduce the risk for damaging top cover when switching piece is connect with tab, especially when switching piece and tab welding, the setting of the recessed portion can reduce the risk that heat transfer to the top cover in welding process causes top cover to damage, to improve the reliability of secondary cell in process, and improve the production efficiency of secondary cell.
Description
[technical field]
This application involves energy storage device technical field more particularly to a kind of secondary cells.
[background technique]
Secondary cell includes top cover, electrode assembly and electric connecting part, wherein electrode assembly includes tab, electrical connection section
Part is fixedly connected with top cover, and including switching piece and pole, wherein switching piece is used for connecting tab and pole, to realize pole
Being electrically connected between ear and pole.
Due to switching piece between top cover at a distance from short transverse it is smaller, when being connected between switching piece and tab
When, there is the risk of damage top cover, the secondary cell is caused to damage.
[utility model content]
In view of this, the embodiment of the present application provides a kind of secondary cell, to solve switching piece in the prior art and pole
When ear connects the problem of damage top cover.
The embodiment of the present application provides a kind of secondary cell, and the secondary cell includes:
Top cover is equipped with mounting hole；
Electric connecting part, including pole and switching piece, the pole pass through the mounting hole, and the connection sheet is located at described
It is electrically connected below top cover and with the pole；
Electrode assembly, including ontology and tab, the tab extend at the top of the ontology, and the tab includes connecting
Socket part, the connecting portion are fixedly connected in the lower section of the switching piece, and with the switching piece；
Wherein, the bottom of the top cover is provided with recessed portion, along short transverse, the bottom wall of the recessed portion and the switching
There is gap between piece.
Preferably, the switching piece connect with the tab welding and forms welding surface；
The welding surface is at least surrounded in the projection of the recessed portion side wall.
Preferably, the depth of the recessed portion is 0.3mm~0.6mm.
Preferably, in the recessed portion, all had between each side wall and the edge of the corresponding welding surface it is default away from
From the pre-determined distance is 1mm~5mm.
Preferably, the projection of the switching piece covers the projection of the recessed portion, and the outer edge of the switching piece exceeds
The side wall of the recessed portion.
Preferably, the cap base is provided with multiple connectors, and the switching piece is provided with receiving hole, the receiving hole
It is oppositely arranged with the connector；
The connector is connect with the switching piece by the receiving hole.
Preferably, the connector includes auxiliary section and limiting section；
For the matching part in the receiving hole, the limiting section protrudes from the lower surface of the switching piece.
Preferably, along from the top cover to the direction of the tab, the receiving hole includes the first hole section and the second hole section,
The sectional area of first hole section is less than the sectional area of second hole section；
The connector includes auxiliary section and limiting section, and the auxiliary section is adapted with first hole section；
The limiting section is located in second hole section；
Alternatively, a part of the limiting section exceeds second hole section.
Preferably, the tab position opposite with the connector is provided with relief portion, at least part of limit
Portion is located in the relief portion.
Preferably, the secondary cell further includes shell；
The material of the top cover and the shell includes high molecular material.
In the application, the lower section of top cover is switching piece and tab, therefore, after recessed portion is arranged in top cover, in recessed portion
Position, top cover are not contacted with switching piece and tab, so as to reduce the risk for damaging top cover when switching piece is connect with tab, especially
It is when switching piece and tab welding, and the setting of the recessed portion, which can reduce heat transfer to the top cover in welding process, to be caused
The risk of top cover damage, to improve the reliability of secondary cell in process, and improves the production efficiency of secondary cell.
[Detailed description of the invention]
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application, for this field
For those of ordinary skill, without creative efforts, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the structural schematic diagram of secondary cell provided herein in a specific embodiment；
Fig. 2 is the explosive view of Fig. 1；
Fig. 3 is the bottom view of top cover in Fig. 2；
Fig. 4 is the structural schematic diagram of electrode assembly in Fig. 2；
Fig. 5 is sectional view along A-A of the secondary cell in the first specific embodiment in Fig. 1；
Fig. 6 is the partial enlarged view of I part of Fig. 5；
Fig. 7 is the cross-sectional view of top cover in Fig. 6；
Fig. 8 is sectional view along A-A of the secondary cell in second of specific embodiment in Fig. 1；
Fig. 9 is the partial enlarged view of II part in Fig. 8；
Figure 10 is the cross-sectional view of top cover in Fig. 9；
Figure 11 is the cross-sectional view of electric connecting part in Fig. 9；
Figure 12 is B-B direction cross-sectional view of the secondary cell in the first specific embodiment in Fig. 1；
Figure 13 is the partial enlarged view of III part in Figure 12；
Figure 14 is the structural schematic diagram that Figure 13 removes sealing ring.
Appended drawing reference:
1- top cover；
11- recessed portion；
111- bottom wall；
112- side wall；
113- welding surface；
12- mounting hole；
13- connector；
The auxiliary section 131-；
132- limiting section；
14- seal chamber；
141- seal groove；
2- electrode assembly；
21- ontology；
22- tab；
221- interconnecting piece；
222- extension；
222a- relief portion；
3- electric connecting part；
31- switching piece；
311- receiving hole；
The first hole section of 311a-；
The second hole section of 311b-；
The lower surface 312-；
32- pole；
321- groove；
4- sealing ring；
5- shell.
[specific embodiment]
In order to better understand the technical solution of the application, the embodiment of the present application is retouched in detail with reference to the accompanying drawing
It states.
It will be appreciated that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.Base
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
Its embodiment, shall fall in the protection scope of this application.
The term used in the embodiment of the present application is only to be not intended to be limiting merely for for the purpose of describing particular embodiments
The application.In the embodiment of the present application and the "an" of singular used in the attached claims, " described " and "the"
It is also intended to including most forms, unless the context clearly indicates other meaning.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, indicate
There may be three kinds of relationships, for example, A and/or B, can indicate: individualism A, exist simultaneously A and B, individualism B these three
Situation.In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".
It should be noted that the nouns of locality such as "upper", "lower" described in the embodiment of the present application, "left", "right" are with attached drawing
Shown in angle come what is be described, should not be construed as the restriction to the embodiment of the present application.In addition, within a context, it is also necessary to
Understand, when mentioning an element and being connected to another element "upper" or "lower", can not only be connected directly between another
Perhaps "lower" can also be indirectly coupled to another element "upper" or "lower" by intermediary element for one element "upper".
Please refer to attached drawing 1~13, wherein Fig. 1 is the knot of secondary cell provided herein in a specific embodiment
Structure schematic diagram；Fig. 2 is the explosive view of Fig. 1；Fig. 3 is the bottom view of top cover in Fig. 2；Fig. 4 is that the structure of electrode assembly in Fig. 2 is shown
It is intended to；Fig. 5 is sectional view along A-A of the secondary cell in the first specific embodiment in Fig. 1；Fig. 6 is the office of I part of Fig. 5
Portion's enlarged drawing；Fig. 7 is the cross-sectional view of top cover in Fig. 6；Fig. 8 be Fig. 1 in A-A of the secondary cell in second of specific embodiment to
Cross-sectional view；Fig. 9 is the partial enlarged view of II part in Fig. 8；Figure 10 is the cross-sectional view of top cover in Fig. 9；Figure 11 is to be electrically connected in Fig. 9
The cross-sectional view of component；Figure 12 is B-B direction cross-sectional view of the secondary cell in the first specific embodiment in Fig. 1；Figure 13 is Figure 12
In III part partial enlarged view；Figure 14 is the structural schematic diagram that Figure 13 removes sealing ring.
The embodiment of the present application provides a kind of secondary cell, and as depicted in figs. 1 and 2, which includes: top cover 1, shell
5 and one or more electrode assemblies 2 inside shell 5, wherein shell 5 can be cuboid or other shapes, and have
Opening, top cover 1 is covered in the opening, and is fixedly connected with shell 5, to close electrode assembly 2 and the electrolyte inside shell 5.
Specifically, which includes the first pole piece, the second pole piece and partition, wherein the first pole piece and the second pole piece
In, one is positive plate, and another one is negative electrode tab, and partition is the insulation system between the first pole piece and the second pole piece, just
The active material of pole piece is coated on the coating area of positive plate, and the active material of negative electrode tab is coated on the coating area of negative electrode tab.
Meanwhile the part extended by the coating area of positive plate is the part extended by the coating area of negative electrode tab as positive pole ear
As negative lug.
In embodiment as shown in Figure 4, which includes two electrode assemblies 2 that W is stacked in the width direction, and two
Electrode assembly 2 includes ontology 21 (being formed by the first pole piece, the second pole piece and partition) and two tabs 22 (positive pole ear and cathode
Tab), and two tabs 22 are electrically connected with two electric connecting parts 3 respectively.
As shown in figure 11, which includes switching piece 31 and pole 32, wherein the pole 32 passes through top cover 1
Mounting hole 12, and the pole 32 is exposed to outside, meanwhile, which connect with the interconnecting piece 221 of tab 22, so as to
Tab 22 and pole 32 are electrically connected by switching piece 31.
Specifically, the switching piece 31 and tab 22 are metal material, and Laser Welding or supersonic welding can be used therebetween
Mode achieve a fixed connection and be electrically connected, when welding, pass through the interconnecting piece that switching piece 31 and tab 22 are heated in laser emission
221 surface, surface heat are internally spread by heat transfer, and the parameter by controlling laser pulse makes 221 He of interconnecting piece
Switching piece 31 melts, and forms specific molten bath.Under normal conditions, temperature when laser welding is up to thousands of degree.
As shown in Fig. 6 and Fig. 9, in the secondary cell, along height direction H, top cover 1 is located at the upper of switching piece 31 and tab 22
There is the risk of damage top cover 1 in heat when side, switching piece 31 and 22 laser welding of tab, the secondary cell is caused to damage.This
In application, the risk of the damage of top cover 1 mainly is reduced by improving the structure of top cover 1.
Specifically, as shown in Fig. 3, Fig. 6 and Fig. 9, the bottom of the top cover 1 is provided with recessed portion 11, recessed along height direction H
There is gap between the bottom wall 111 and switching piece 31 of concave portion 11.
In the application, as shown in Fig. 6 and Fig. 9, the lower section of top cover 1 is switching piece 31 and tab 22, therefore, in top cover 1
After recessed portion 11 is arranged in bottom, in the position of recessed portion 11, top cover 1 is not contacted with switching piece 31 and tab 22, so as to drop
The risk of top cover 1 is damaged when low switching piece 31 is fixedly connected with tab 22, especially when switching piece 31 and tab 22 use laser
When the mode of welding connects, the setting of the recessed portion 11, which can reduce the heat transfer in welding process to top cover 1, leads to top cover 1
The risk of damage to improve the reliability of secondary cell in process, and improves the production efficiency of secondary cell.
Meanwhile in the application, which can be made with shell 5 of high molecular material, i.e., top cover 1 and shell 5 have exhausted
Edge specifically includes PP material, and is formed by modes such as injection molding, extrusion, moldings, and Laser Welding can be used in top cover 1 and shell 5
It connects, the modes such as ultrasonic welding, landfilling area are fixedly connected and seal.Compared with the top cover of existing metal material and shell, this Shen
Please in secondary cell without adding insulating layer, insulation can be realized by top cover 1 and top cover 5, so as to save space, subtract
The volume and quality of small secondary cell improve energy density.When tab 22 and switching piece 31 weld, the top cover 1 of high molecular material
The top cover of middle metal structure is more easier to damage compared to the prior art, and in the present embodiment, above-mentioned recessed portion is arranged in 1 bottom of top cover
After 11, the risk of 1 melted by heat of top cover of high molecular material can be effectively reduced.
Further, the welding surface 113 of switching piece 31 and tab 22 is at least surrounded in the projection of the side wall 112 of recessed portion 11.
Wherein, the welding surface 113 of switching piece 31 and tab 22 both is intersection and the face welded, i.e. the welding surface 113 is
The face that the welding track of switching piece 31 and tab 22 is surrounded.
In the present embodiment, the side wall 112 of the recessed portion 11 can at least surround the welding between switching piece 31 and tab 22
Track, therefore, between the bottom wall 111 of the welding surface 113 between height direction H, switching piece 31 and tab 22 and recessed portion 11
Gap is all had, i.e. the recessed portion 11 can avoid the welding track between switching piece 31 and tab 22 completely, thus further
Reduce the risk that top cover 1 damages.
Specifically, as shown in figure 4, tab 22 in ontology 21 after extending, it is connected with electric connecting part 3, in view of being electrically connected
The position of relay part 3, the tab 22 need to bend inwards, and form interconnecting piece 221, which is used for and 31 laser of switching piece
Welding, in order to both improve the reliability of laser welding, the welding surface of interconnecting piece 221 and switching piece 31 do not answer it is too small, therefore,
The contact area of interconnecting piece 221 and switching piece 31 does not answer too small, the i.e. size of interconnecting piece 221 L and width direction W along its length
It does not answer too small.
Specifically, when the interconnecting piece 221 of tab 22 and switching piece 31 weld, molten bath that the two is formed can towards top cover 1 (to
On) direction protrusion, therefore when the depth of the recessed portion 11 is too small, which has the risk contacted with top cover 1, causes to push up
Lid 1 is burned, and still, when the depth of the recessed portion 11 is excessive, required 1 thickness of top cover is larger, improves the weight of top cover 1,
Reduce the energy density of secondary cell.
Therefore, in the present embodiment, the depth of above-mentioned recessed portion 11 is 0.3mm~0.6mm, as shown in fig. 6, in the recessed portion
11 position, the distance between the upper surface of switching piece 31 and the bottom wall 111 of recessed portion 11 are 0.3mm~0.6mm, so as to
It enough avoids contacting when molten bath is raised to top cover 1 with top cover 1, further increases the safety of top cover 1, and it is thick to can be avoided top cover 1
Spending big caused secondary cell energy density reduces.
Specifically, the depth of the recessed portion 11 can be 0.4mm, can also reasonably select recessed portion 11 according to above-mentioned two factor
Thickness.
Meanwhile in interconnecting piece 221 and 31 welding process of switching piece, the 113 Edge Distance recessed portion 11 of welding surface of the two
When side wall 112 is closer, however it remains the risk of damage top cover 1 in welding process, and the Edge Distance recessed portion of welding surface 113
11 side wall 112 farther out when, the area of the recessed portion 11 is excessive or the area of welding surface 113 is too small, the area mistake of recessed portion 11
It may cause connector 13 greatly and be arranged that position is smaller, influence being fixedly connected for switching piece 31 and top cover 1, and the face of welding surface 113
The too small soldering reliability reduced between tab 22 and switching piece 31 of product.
Therefore, it as shown in figure 3, in the recessed portion 11, is all had between each side wall 112 and the edge of corresponding welding surface 113
Pre-determined distance, and the pre-determined distance is 1mm~5mm, so as to prevent tab 22 and switching piece 31 from damaging top cover 1 when welding,
It can also ensure that soldering reliability between the two, meanwhile, which will not occupy the setting position of connector 13, guarantee
Switching piece 31 is capable of fixing with top cover 1 and connect.
Specifically, above-mentioned pre-determined distance concretely 2mm can also reasonably select pre-determined distance according to above-mentioned two factor
Specific value.
Further, as shown in fig. 6, the projection of switching piece 31 covers the projection of recessed portion 11, and the switching piece 31 is outer
Edge exceeds the side wall 112 of recessed portion 11, so that the bottom wall 111 for limiting switching piece 31 towards recessed portion 11 moves, prevents from transferring
Piece 31 is contacted with the bottom wall 111 of recessed portion 11, and the recessed portion 11 can not play the role of avoiding welding heat when the two contacts.Cause
This, the distance between upper surface of the bottom wall 111 of the recessed portion 11 everywhere and switching piece 31 is the depth of recessed portion 11, to protect
After the recessed portion 11 is arranged in card, the damage of top cover 1 can be avoided.
In embodiment as shown in Figure 3, since the secondary cell includes two electrode assemblies 2, and each electrode assembly 2 is distinguished
Including two tabs 22 (positive pole ear and negative lug), therefore, which is provided with 4 recessed portions 11 and the present embodiment
In, there are four rectangular recess for the bottom setting of the top cover 1.
Certainly, above-mentioned recessed portion 11 is not limited only to as rectangular recess, can also be other shapes commonly used in the art, such as
Square, circle etc., as long as the welding surface of tab 22 Yu switching piece 31 can be surrounded.It is limited to the size of top cover 1, this implementation
Recessed portion 11 is preferably rectangular in shape in example.
In the above various embodiments, as shown in figure 3, top cover 1 offers two mounting holes 12, two mounting holes 12 are respectively used to the two poles of the earth
After column 32 passes through, and pole 32 passes through mounting hole 12, switching piece 31 is fixedly connected with top cover 1, thus by electric connecting part 3 and top
Lid 1 is fixed.
Specifically, in the present embodiment, which is that high molecular material is made, and switching piece 31 includes with top cover 1
Therefore metal material can be connected between top cover 1 and switching piece 31 by 13 rivet hot of connector.Meanwhile switching piece 31 is provided with appearance
Receive hole 311, along height direction H, which is oppositely arranged with connector 13, the mistake of connector 13 and 31 rivet hot of switching piece
Cheng Zhong, 13 melted by heat of connector, the material after fusing enters in receiving hole 311, and forms in receiving hole 311, i.e. the company
After fitting 13 and 31 rivet hot of switching piece, at least part of connector 13 is located in receiving hole 311, to realize connecting column 13 and turn
The rivet hot of contact pin 31 connects.
When the secondary cell forms, the pole 32 of electric connecting part 3 is passed through to the mounting hole 12 of top cover 1 first, then will
Switching piece 31 and top cover 1 are by 13 rivet hot of connector, then by switching piece 31 and 22 laser welding of tab.It, should in the present embodiment
When top cover 1 and electric connecting part 3 use the connection type of rivet hot, top cover 1 and 3 height direction H of electric connecting part can be reduced
Size improves the capacity of secondary cell to both reduce space occupied in the secondary battery.
Further, as shown in figure 4, along height direction H, the position opposite with connector 13 of tab 22 is provided with relief portion
222a。
In the application, by the way that relief portion 222a is arranged, enable connector 13 for connecting switching piece 31 Yu top cover 1
Enough it is located in relief portion 222a, it, can so as to reduce top cover 1, switching piece 31 and tab 22 along the size of height direction H
Enough reduce occupied by three along the space of height direction H, and then improves the capacity of the secondary cell.
Meanwhile the tab 22 further includes the extension 222 beyond interconnecting piece 221, and the extension 222 is located at interconnecting piece
221 inside, above-mentioned relief portion 222a are set to the extension 222.Wherein, as shown in Fig. 4, Fig. 6 and Fig. 9, " inside " be with
Defined on the basis of the center line of electrode assembly 2, the direction close to the center line be it is interior, the direction of the separate center line is outer.
Therefore, in the present embodiment, a part (interconnecting piece 221) of tab 22 is used to weld with switching piece 31, another part
(extension 222) is provided with the relief portion 222a for avoiding connector 13, and relief portion 222a avoids tab 22 and switching
Both welding region between piece 31, thus guarantee that there is biggish bonding area between tab 22 and switching piece 31, improve
Soldering reliability.
Specifically, for connector 13 with before 31 rivet hot of switching piece, which can be cylindrical structure, the company of the structure
Fitting 13 has the advantages that structure is simple, after rivet hot, since there are material fusing reshapings for the connector 13 during rivet hot
Process, therefore, the shape of the connector 13 and non-primary cylindrical structure after rivet hot.
In the first embodiment, the receiving hole 311 of the switching piece 31 is cylindrical hole, (Fig. 5~7 as shown in Fig. 5~Fig. 7
Shown in for each component after secondary cell molding, i.e. after connector 13 and 31 rivet hot of switching piece structure), the switching piece 31 with connect
After 13 rivet hot of fitting, which includes auxiliary section 131 and limiting section 132, wherein auxiliary section 131 is located at cylindrical container
In hole 311, and since the material of the connector 13 melts, which fills up the receiving hole 311.Meanwhile such as Fig. 6 institute
Show, which protrudes from the lower surface 312 of switching piece 31, and after rivet hot, the material that connector 13 melts fails whole receivings
In in above-mentioned receiving hole 311, a part is overflowed out of receiving hole 311, and forms limiting section 132, and along height direction H, at least
Partial limiting section 132 is located in corresponding relief portion 222a.
In another embodiment, as shown in Fig. 8~11 (shown in Fig. 8~11 for after secondary cell molding, i.e. connector
13 with 31 rivet hot of switching piece after each component structure), along from top cover 1, to the direction H1 of tab 22, which includes first
Hole section 311a and the second hole section 311b, and sectional area of the sectional area of first hole section 311a less than the second hole section 311b.
Meanwhile after connector 13 and 31 rivet hot of switching piece, which includes including 131 He of auxiliary section
Limiting section 132, wherein in embodiment as shown in Figure 9, auxiliary section 131 is adapted with the first hole section 311a, limiting section 132 with
Second hole section 311b is adapted, i.e., in the embodiment, limiting section 132 does not protrude from the lower surface 312 of switching piece 31.
Alternatively, (not shown), a part of the limiting section 132 are located at the second hole section 311b in another embodiment
Interior, another part exceeds second hole section 311b, i.e. a part of limiting section 132 protrudes from the lower surface 312 of switching piece 31,
And the limiting section 132 protrudes from the part of 31 lower surface 312 of switching piece and is located in above-mentioned relief portion 222a.
It is appreciated that the receiving hole 311 of varying aperture is under same depth in the present embodiment compared with cylindrical container hole
With bigger volume, the material after more connectors 13 melts can be accommodated, in embodiment as shown in Figure 9, connector
13 materials melted with connector 13 during 31 rivet hot of switching piece are entirely located in the receiving hole 311 (i.e. auxiliary section 131 and limit
Position portion 132 is entirely located in receiving hole 311), which is not present the part for protruding from the lower surface 312 of switching piece 31, this
When, the extension 222 of tab 22 can be not provided with above-mentioned relief portion 222a.Certainly, in another embodiment, when the ruler of connector 13
When very little larger or switching piece 31 thickness is smaller, even if the receiving hole 311 of switching piece 31 is variable diameter hole, the connector 13 after rivet hot
There are still the parts for protruding from lower surface 132, and therefore, in the present embodiment, when receiving hole 311 is variable diameter hole, extension 222 is still
Above-mentioned relief portion 222a need to be set.
Further, in the above various embodiments, which includes multiple tabs 22, and each tab 22 is along height direction H
It is stacked, and each tab 22, after stretching out in ontology 21, in order to weld with switching piece 31, each tab 22 bends inwards, each pole
After ear 22 is bent, inner end is mutually staggered along height direction H, i.e., the inward flange of each extension 222 is mutually wrong along height direction H
It opens, therefore, in the electrode assembly 2, each tab 22, along direction from inside to outside, respectively prolongs after the extension of ontology 21 and bending inwards
Size after the stacking of extending portion 222 along height direction H is gradually increased, as shown in Fig. 6 and Fig. 9.Wherein, such as Fig. 4, Fig. 6 and Fig. 9 institute
Show, " inside " is defined on the basis of the center line of electrode assembly 2, and the direction close to the center line is interior, separate center
The direction of line is outer.
Based on this, when tab 22 extension 222 be arranged relief portion 222a when, due to extension 222 inner end gradually
Outward, therefore, along direction from inside to outside, the sectional area of the relief portion 222a of each extension 222 is gradually reduced, and there are certain or
Certain extensions 222 are not provided with the possibility of relief portion 222a.Specifically, in embodiment as shown in Figure 4, the extension 222
Inward flange open up it is jagged, the notch be above-mentioned relief portion 222a, as shown in figure 3, at least a part of connector 13 be located at should
In notch.Alternatively, in another embodiment, which offers through-hole, which is above-mentioned relief portion 222a.
In the application, relief portion 222a does not answer too small or excessive, and when relief portion 222a is undersized, exist to keep away completely
Allow the risk of connector 13, relief portion 222a it is oversized when, cause 221 area of interconnecting piece of tab 22 smaller, to subtract
The area of welding surface between small interconnecting piece 221 and switching piece 31 reduces the soldering reliability of the two.Therefore, it is avoided in the application
The concrete shape and size of portion 222a can be according to the interconnecting piece 221 of connector 13 and tab 22 along height direction H interference portion
Shape and size setting.
In the above various embodiments, as shown in figure 11, the pole 32 and switching piece 31 are integrally formed, wherein the pole 32 is stretched
It out to outside top cover 1, is electrically connected for the busbar connector with battery modules, switching piece 31 is located inside top cover 1, is used for and top cover 1
It is fixedly connected, and is electrically connected with the tab of electrode assembly 2 22.
In the present embodiment, integrally formed pole 32 has the advantages that simple structure and convenient processing, and energy with switching piece 31
Being fixedly connected between pole 32 and switching piece 31 is saved, enough so as to reduce height occupied by the two.
Specifically, as shown in figure 11, in the electric connecting part 3, pole 32 is cylindrical structure, and switching piece 31 is opposite
Extend outwardly in the periphery wall of pole 32, meanwhile, the bottom of the pole 32 is additionally provided with groove 321, and the depth of the groove 321 can
It is roughly the same with the thickness of switching piece 31.In the present embodiment, after which is set, the weight of electric connecting part 3 can be reduced
Amount, so as to improve the energy density of the secondary cell.
Meanwhile as shown in Fig. 2, there is sealing ring 4, as illustrated in fig. 7 and fig. 10,1 bottom of top cover between switching piece 31 and top cover 1
Portion is also provided with seal groove 141, which is opened in the periphery of mounting hole 12, as shown in figure 14, the periphery of pole 32
Wall, the side wall of the upper surface of switching piece 31 and seal groove 141 and bottom wall surround seal chamber 14, and sealing ring 4 is located at the seal chamber
In 14, and when switching piece 31 is connect with top cover 1, the two compresses the sealing ring 4 along height direction H, to realize secondary cell
Sealing.
To sum up, the height of secondary cell occupied by the cap assembly of the secondary cell in the application is smaller, so as to
The capacity of the secondary cell is improved, meanwhile, top cover 1 and shell 5 are high molecular material, therefore, can be realized the secondary cell
Insulation.
The foregoing is merely the preferred embodiments of the application, not to limit the application, all essences in the application
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the application protection.
Claims (10)
1. a kind of secondary cell, which is characterized in that the secondary cell includes:
Top cover is equipped with mounting hole；
Electric connecting part, including pole and switching piece, the pole pass through the mounting hole, and the switching piece is located at the top cover
It lower section and is electrically connected with the pole；
Electrode assembly, including ontology and tab, the tab extend at the top of the ontology, and the tab includes connection
Portion, the connecting portion are fixedly connected in the lower section of the switching piece, and with the switching piece；
Wherein, the bottom of the top cover is provided with recessed portion, along short transverse (H), the bottom wall of the recessed portion and the switching
There is gap between piece.
2. secondary cell according to claim 1, which is characterized in that
The switching piece connect with the tab welding and forms welding surface；
The welding surface is at least surrounded in the projection of the recessed portion side wall.
3. secondary cell according to claim 1, which is characterized in that
The depth of the recessed portion is 0.3mm~0.6mm.
4. secondary cell according to claim 2, which is characterized in that
In the recessed portion, pre-determined distance is all had between each side wall and the edge of the corresponding welding surface, it is described default
Distance is 1mm~5mm.
5. secondary cell according to claim 2, which is characterized in that
The projection of the switching piece covers the projection of the recessed portion, and the outer edge of the switching piece is beyond the recessed portion
The side wall.
6. secondary cell according to any one of claims 1 to 5, which is characterized in that
The cap base is provided with multiple connectors, and the switching piece is provided with receiving hole, the receiving hole and the connection
Part is oppositely arranged；
The connector is connect with the switching piece by the receiving hole.
7. secondary cell according to claim 6, which is characterized in that
The connector includes auxiliary section and limiting section；
For the matching part in the receiving hole, the limiting section protrudes from the lower surface of the switching piece.
8. secondary cell according to claim 6, which is characterized in that
Along direction (H1) from the top cover to the tab, the receiving hole includes the first hole section and the second hole section, and described the
The sectional area of one hole section is less than the sectional area of second hole section；
The connector includes auxiliary section and limiting section, and the auxiliary section is adapted with first hole section；
The limiting section is located in second hole section；
Alternatively, a part of the limiting section exceeds second hole section.
9. secondary cell according to claim 7, which is characterized in that
The tab position opposite with the connector is provided with relief portion, and at least part of limiting section is located at described keep away
It allows in portion.
10. secondary cell according to any one of claims 1 to 4, which is characterized in that
The secondary cell further includes shell；
The material of the top cover and the shell includes high molecular material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920415323.5U CN209626264U (en) | 2019-03-29 | 2019-03-29 | Secondary cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920415323.5U CN209626264U (en) | 2019-03-29 | 2019-03-29 | Secondary cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209626264U true CN209626264U (en) | 2019-11-12 |
Family
ID=68458028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920415323.5U Active CN209626264U (en) | 2019-03-29 | 2019-03-29 | Secondary cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209626264U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111326700A (en) * | 2019-12-26 | 2020-06-23 | 湖北锂诺新能源科技有限公司 | Electric connection structure between module electric cores |
| WO2022170488A1 (en) * | 2021-02-09 | 2022-08-18 | 宁德时代新能源科技股份有限公司 | End cover assembly, cell, battery, electric apparatus, and manufacturing method |
| CN115295976A (en) * | 2022-10-08 | 2022-11-04 | 武汉亿纬储能有限公司 | Spacing piece of utmost point ear, top cap subassembly and battery |
| WO2024016453A1 (en) * | 2022-07-20 | 2024-01-25 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electric device |
| WO2024098528A1 (en) * | 2022-11-11 | 2024-05-16 | 厦门海辰储能科技股份有限公司 | Battery end cover assembly, energy storage apparatus and electric device |
| WO2024193178A1 (en) * | 2023-03-23 | 2024-09-26 | 欣旺达动力科技股份有限公司 | Secondary battery |
-
2019
- 2019-03-29 CN CN201920415323.5U patent/CN209626264U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111326700A (en) * | 2019-12-26 | 2020-06-23 | 湖北锂诺新能源科技有限公司 | Electric connection structure between module electric cores |
| WO2022170488A1 (en) * | 2021-02-09 | 2022-08-18 | 宁德时代新能源科技股份有限公司 | End cover assembly, cell, battery, electric apparatus, and manufacturing method |
| WO2024016453A1 (en) * | 2022-07-20 | 2024-01-25 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electric device |
| CN115295976A (en) * | 2022-10-08 | 2022-11-04 | 武汉亿纬储能有限公司 | Spacing piece of utmost point ear, top cap subassembly and battery |
| CN115295976B (en) * | 2022-10-08 | 2023-01-13 | 武汉亿纬储能有限公司 | Spacing piece of utmost point ear, top cap subassembly and battery |
| US11984619B2 (en) | 2022-10-08 | 2024-05-14 | Eve Energy Storage Co., Ltd. | Tab limiting sheet, top cover assembly, and battery |
| WO2024098528A1 (en) * | 2022-11-11 | 2024-05-16 | 厦门海辰储能科技股份有限公司 | Battery end cover assembly, energy storage apparatus and electric device |
| WO2024193178A1 (en) * | 2023-03-23 | 2024-09-26 | 欣旺达动力科技股份有限公司 | Secondary battery |
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