CN208819974U - Secondary cell - Google Patents

Abstract

The utility model provides a kind of secondary cell comprising electrode assembly, shell, cap assembly, switching component and insulator.Electrode assembly is contained in shell.Cap assembly includes lamina tecti and first electrode terminal, and lamina tecti is connected to shell and has first end sub-aperture, and first electrode terminal is set to lamina tecti and covering first end sub-aperture.It transfers component connection electrode component and first electrode terminal, insulator will transfer component and lamina tecti separates.Component of transferring includes main part and interconnecting piece, and main part is set to the side of the close electrode assembly of lamina tecti and is connected to electrode assembly, and interconnecting piece extends from the side of the separate electrode assembly of main part and protrudes into first end sub-aperture.Interconnecting piece is connected to first electrode terminal and is equipped with limit hole.Insulator includes first part and protrusion, and first part is looped around the outside of interconnecting piece, and protrusion extends from the side of the close interconnecting piece of first part and is inserted into limit hole.

Description

Secondary cell

Technical field

The utility model relates to field of batteries more particularly to a kind of secondary cells.

Background technique

Secondary cell generally includes electrode assembly, accommodates the shell of electrode assembly and is fixed on the cap assembly of shell, The lamina tecti of cap assembly is by housing seal.Cap assembly further includes the electrode terminal for protruding from lamina tecti, for setting with outside Standby electrical connection.In order to improve the energy density of secondary cell, electrode terminal can be arranged on the outside of lamina tecti, to avoid electrode The inner space of terminal occupancy secondary cell.And in order to realize the charge and discharge of electrode assembly, electrode terminal is needed through switching structure Part is electrically connected with the tab of electrode assembly.Switching component is contained in shell, in order to connect with the electrode terminal in outside, is then needed Across lamina tecti.Common mode is that terminal hole is opened up on lamina tecti, and interconnecting piece outstanding is arranged on switching component, connects Portion protrudes into terminal hole and is fixed on electrode terminal.For the ease of assembly, interconnecting piece and terminal hole are usually clearance fit；It is welding When interconnecting piece and electrode terminal, on the basis of the central axis of terminal hole, and due to the presence of clearance fit, interconnecting piece is easy laser It is shaken in terminal hole, causes interconnecting piece to deviate setting position, be easy to cause failure welding.

Utility model content

In view of the problems in the background art, the purpose of this utility model is to provide a kind of secondary cells, can prevent Rotation stop connection member shakes during the welding process, avoids failure welding, guarantees the quality of secondary cell.

To achieve the goals above, the utility model provides a kind of secondary cell comprising electrode assembly, shell, top Cap assemblies, switching component and insulator.Electrode assembly is contained in shell.Cap assembly includes lamina tecti and first electrode end Son, lamina tecti are connected to shell and have first end sub-aperture, and first electrode terminal is set to lamina tecti and covering first end sub-aperture. It transfers component connection electrode component and first electrode terminal, insulator will transfer component and lamina tecti separates.Switching component include Main part and interconnecting piece, main part are set to the side of the close electrode assembly of lamina tecti and are connected to electrode assembly, interconnecting piece Extend from the side of the separate electrode assembly of main part and protrudes into first end sub-aperture.Interconnecting piece is connected to first electrode terminal and sets There is limit hole.Insulator includes first part and protrusion, and first part is looped around the outside of interconnecting piece, raised from first part Side close to interconnecting piece extends and is inserted into limit hole.

Interconnecting piece includes roof and side wall, and roof is fixed on first electrode terminal, and side wall connects main part and roof.Roof Recess portion of the opening towards electrode assembly is surrounded with side wall, at least part of limit hole is formed in side wall.

Limit hole penetrates through side wall.Preferably, protrusion is interference fitted with limit hole.

Limit hole is multiple and being provided at circumferentially spaced along side wall, and in the raised only limit hole of insertion portion.

Side wall is four and four side walls surround rectangular box.

Each side wall has been respectively formed on limit hole, and protrusion is at least inserted into the limit hole on two opposite side walls.

Limit hole is strip, and side wall is greater than 1mm in width of the limit hole along the end of extending direction.

The material of insulator is flexible plastic cement.

Electrode assembly includes the first tab；The secondary cell further includes thermistor, connects the first tab and main part.

The beneficial effects of the utility model are as follows: in this application, passing through the cooperation of protrusion and limit hole, the company of may be implemented Positioning of the socket part in first end sub-aperture avoids switching component from shaking during the welding process, avoids failure welding, guarantee secondary The quality of battery.

Detailed description of the invention

Fig. 1 is the perspective view according to the secondary cell of the utility model.

Fig. 2 is the schematic diagram according to an embodiment of the secondary cell of the utility model.

Fig. 3 is the enlarged drawing of Fig. 2 Blocked portion.

Fig. 4 is the cross-section diagram according to the electrode assembly of the utility model.

Fig. 5 is the schematic diagram according to the first pole piece of the electrode assembly of the utility model after deployment.

Fig. 6 is the cross-sectional view that A-A makes along Fig. 5.

Fig. 7 is the perspective view according to the switching component of the secondary cell of the utility model.

The side view for the switching component that Fig. 8 is Fig. 7.

Fig. 9 is the schematic diagram according to the switching component and thermistor of the secondary cell of the utility model.

Figure 10 is another schematic diagram according to the switching component and thermistor of the secondary cell of the utility model.

Figure 11 is the schematic diagram according to another embodiment of the secondary cell of the utility model.

Wherein, the reference numerals are as follows:

1 electrode assembly, 41 main part

11 first tab, 42 interconnecting piece

12 second tab, 421 limit hole

13 first pole piece, 422 roof

131 first collector, 423 side wall

132 first active material layer, 424 recess portion

14 second pole piece, 5 insulator

15 diaphragm, 51 first part

2 shell, 52 protrusion

3 cap assembly, 53 second part

31 lamina tecti, 6 thermistor

311 first end sub-aperture X are lateral

32 first electrode terminal Y are longitudinal

33 second electrode terminal Z height directions

4 switching components

Specific embodiment

Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.Below Description only actually at least one exemplary embodiment be it is illustrative, never as to the application and its application or making Any restrictions.Based on the embodiment in the application, those of ordinary skill in the art are in no development creative work premise Under every other embodiment obtained, shall fall in the protection scope of this application.

In the description of the present application unless specifically defined or limited otherwise, term " first ", " second " are only used for describing Purpose, be not understood to indicate or imply relative importance；Term " multiple " refers to two or more；Unless otherwise Regulation or explanation, term " connection ", " fixation " etc. shall be understood in a broad sense, can also be with for example, " connection " may be a fixed connection It is to be detachably connected, or be integrally connected, or electrical connection or signal connect；" connection " can be directly connected, and can also pass through Intermediary is indirectly connected.For the ordinary skill in the art, it can understand that above-mentioned term exists as the case may be Concrete meaning in the application.

The secondary cell of the application can be lithium ion battery.Referring to Figures 1 and 2, in the first embodiment, the two of the application Primary cell includes electrode assembly 1, shell 2, cap assembly 3, switching component 4 and insulator 5.

Referring to Fig. 4, electrode assembly 1 includes that the first pole piece 13, the second pole piece 14 and diaphragm 15, diaphragm 15 are set to the first pole Between piece 13 and the second pole piece 14.Electrode assembly 1 is by being helically wrapped the first pole piece 13, the second pole piece 14 and diaphragm 15 come shape At, and press to form ellipsoidal structure by pressure.Electrode assembly 1 is the core component that secondary cell realizes charging/discharging function.

Referring to figure 5 and figure 6, the first pole piece 13 include the first collector 131 and coated on 131 surface of the first collector the One active material layer 132.First pole piece 13 can be anode pole piece, and the first collector 131 is aluminium foil, the first active material layer 132 Including LiMn2O4, LiFePO4 isoreactivity material.It can be by active material (such as LiMn2O4, LiFePO4), binder, conductive agent And slurry is made in solvent, and then slurry is coated on to two surfaces of the first collector 131, form the first activity after slurry curing Material layer 132.

Only partial region is coated with the first active material layer 132 to first collector 131.Referring to Fig. 6, the first active material layer 132 and first the region coated with the first active material layer 132 of collector 131 form the first coating of the first pole piece 13 Area, the region of uncoated first active material layer 132 of the first collector 131 form the first blank area of the first pole piece 13.

First blank area can be multiple and arranged for interval, after the first 13 coiling and molding of pole piece, the multiple first Blank area is stacked together.

Second pole piece 14 includes the second collector and the second active material layer coated on the second collection liquid surface, and second is living Property material layer and the region coated with the second active material layer of the second collector form the second coating area of the second pole piece 14, The region of uncoated second active material layer of second collector forms the second blank area of the second pole piece 14.Second blank area It can be multiple and arranged for interval, after the second 14 coiling and molding of pole piece, the multiple second blank area is stacked together.Second pole The structure of piece 14 is similar to the structure of the first pole piece 13, and difference is, the material of the second collector can be copper foil, the second activity Material layer includes graphite or silicon isoreactivity material.

Diaphragm 15 can for polyethylene (PE) film, polypropylene (PP) film, PP PE PP sandwich diaphragm.

After 1 coiling and molding of electrode assembly, multiple first blank areas of the first pole piece 13 are stacked together and as electrode Multiple second blank areas of first tab 11 of component 1, the second pole piece 14 are stacked together and the second pole as electrode assembly 1 Ear 12.

The wireline reel of electrode assembly 1 is parallel to short transverse Z, and the first tab 11 and the second tab 12 are set to electrode assembly 1 along the upper end of short transverse Z.

Referring to Figures 1 and 2, shell 2 can have hexahedral shape or other shapes.Accommodating chamber is formed inside shell 2, to hold Nano electrode component 1 and electrolyte.Shell 2 forms opening at one end, and electrode assembly 1 can be placed into shell 2 via the opening Accommodating chamber.Shell 2 can be made of the material of conductive metal, it is preferable that shell 2 is made of the aluminum or aluminum alloy of high reliablity.

Cap assembly 3 includes lamina tecti 31, first electrode terminal 32 and second electrode terminal 33.Lamina tecti 31 is set to shell Body 2 and the opening for covering shell 2, so that electrode assembly 1 is enclosed in shell 2.Lamina tecti 31 can connect by welding It is connected to shell 2.First electrode terminal 32 and second electrode terminal 33 are set to cover board 31, and first electrode terminal 32 is electrically connected to First tab 11, second electrode terminal 33 are electrically connected to the second tab 12.

Lamina tecti 31 has first end sub-aperture 311 up and down, and first electrode terminal 32 can be fixed to by connector The outside of lamina tecti 31, meanwhile, first electrode terminal 32 is from outer side covering first end sub-aperture 311.First electrode terminal 32 and top Sealing ring is equipped between cover board 31, first electrode terminal 32 realizes the sealing of first end sub-aperture 311 by compresses seal.

Referring to Fig. 3, the first tab 11 and first electrode terminal 32 of 4 connection electrode component 1 of component of transferring, thus by electrode The electric current of component 1 is transferred to first electrode terminal 32, realizes that secondary cell externally exports.In order to avoid lamina tecti 31 and electrode group The components conductings such as part 1 and switching component 4, are usually arranged the inside of lamina tecti 31 (i.e. towards the side of electrode assembly 1) and insulate Body 5, insulator 5 can be fixed on lamina tecti 31 by way of injection molding.Insulator 5 can will switching (or the electrode assembly of component 4 1) it is separated with the insulation of lamina tecti 31, avoids lamina tecti 31 that first tab 11 of electrode assembly 1 and the second tab 12 are connected, prevent Short circuit.

Component 4 of transferring includes main part 41 and interconnecting piece 42, and main part 41 is set to the close electrode assembly 1 of lamina tecti 31 Side and be connected to electrode assembly 1, interconnecting piece 42 extends from the side of the separate electrode assembly 1 of main part 41 and protrudes into first Terminal hole 311.Main part 41 is tabular, and interconnecting piece 42 is prominent relative to the surface of the separate electrode assembly 1 of main part 41.Even Socket part 42 is connected to first electrode terminal 32 and is equipped with limit hole 421.

Insulator 5 includes first part 51, protrusion 52 and second part 53, and second part 53 is set to main part 41 and top Between cover board 31, first part 51 is connected with second part 53 and extends in first end sub-aperture 311.First part 51 is looped around In other words the outside of interconnecting piece 42 has through-hole in the middle part of first part 51, interconnecting piece 42 is inserted into the through-hole.Protrusion 52 from The side of the close interconnecting piece 42 of first part 51 extends and is inserted into limit hole 421.First part 51 far from interconnecting piece 42 one It is close to the hole wall of first end sub-aperture 311 side.Both wherein, interconnecting piece 42 and 51 clearance fit of first part, thus simplify Assembly technology.

The secondary cell of the application can assemble as steps described below: one) being welded to the first tab 11 of electrode assembly 1 and turn The main part 41 of connection member 4.2) interconnecting piece 42 for component 4 of transferring is inserted into the through-hole of first part 51, and inserts protrusion 52 Enter the limit hole 421 of interconnecting piece 42, wherein insulator 5 and cap assembly 3 first pass through injection molding in advance and be linked together.3) by interconnecting piece 42 are welded as a whole with first electrode terminal 32.4) electrode assembly 1 is packed into shell 2, then welded case 2 and lamina tecti 31.

In this application, by the cooperation of protrusion 52 and limit hole 421, interconnecting piece 42 may be implemented in first end sub-aperture Positioning in 311 avoids switching component 4 from shaking during the welding process, avoids failure welding, guarantee the quality of secondary cell.

The material of insulator 5 is flexible plastic cement.In the process for the through-hole that interconnecting piece 42 is inserted into first part 51 In, protrusion 52 can under the action of interconnecting piece 42 flexible deformation；When interconnecting piece 42 and first electrode terminal 32 contact, protrusion 52 position is opposite with the position of limit hole 421, so protrusion 52 restores to the original state and is inserted into limit hole 421.

Referring to Fig. 3 and Fig. 7, interconnecting piece 42 includes roof 422 and side wall 423, and roof 422 is by being fixedly welded on the first electricity Extreme son 32, side wall 423 extends from the edge of roof 422 and connects main part 41 and roof 422.Roof 422 and side wall 423 enclose At opening towards the recess portion 424 of electrode assembly 1, at least part of limit hole 421 is formed in side wall 423.Switching component 4 can lead to It crosses stamped sheet metal to be made, and forms recess portion 424 at the position of punching press.

Compared with solid interconnecting piece 42, the interconnecting piece 42 of the application can reduce the weight of switching component 4, meanwhile, also Energy needed for welded connection 42 and first electrode terminal 32 can be reduced.

When welding roof 422 and first electrode terminal 32, the heat for welding generation is passed via side wall 423 and main part 41 It is directed at electrode assembly 1, to reduce heat transfer, high temperature is avoided to influence the performance of electrode assembly 1, the preferred limit hole 421 of the application penetrates through Side wall 423.Specifically, the application reduces the sectional area of side wall 423 by the limit hole 421 of setting perforation, to reduce biography It is directed at the heat of electrode assembly 1, improves the performance of electrode assembly 1.

In addition, sectional area (i.e. perpendicular to the area in the section of short transverse Z) of the side wall 423 at limit hole 421 is smaller, Therefore, when secondary cell occurs short-circuit because unexpected, the electric current that increased dramatically can blow side wall 423, to cut off short circuit, prevent Only secondary cell is on fire, explodes.Meanwhile the weight of switching component 4 can also be reduced by the limit hole 421 of setting perforation, it mentions The energy density of high secondary cell.

Referring to Fig. 3, since limit hole 421 is that through-hole causes convex so protrusion 52 may be slided in limit hole 421 Playing 52 locating effect reduces.It is therefore preferred that protrusion 52 is interference fitted with limit hole 421, can exist in this way to avoid protrusion 52 Sliding in limit hole 421, guarantees the locating effect of protrusion 52, avoids failure welding.

Limit hole 421 is multiple and being provided at circumferentially spaced along side wall 423, and the limit hole of 52 only insertion portion of protrusion In 421.In other words, protrusion 52 is not inserted at least one limit hole 421.The limit hole 421 for being not inserted into protrusion 52 can To play logical wind action, to distribute the heat that welding generates in time, avoid electrode assembly 1 by the influence of high temperature.

In the prior art, interconnecting piece 42 is usually cylinder, and in welding, interconnecting piece 42 may be in first end sub-aperture Rotation in 311 leads to the dislocation of component 4 of transferring, influences the quality of secondary cell.And in application, referring to Fig. 7, side wall 423 is four A and four side walls 423 surround rectangular box, and first part 51 is looped around the outside (in other words, first of interconnecting piece 42 The through-hole of part 51 is rectangular opening), therefore, the application can rotate to avoid interconnecting piece 42, improve assembly precision.

Referring to Fig. 3 and Fig. 7, each side wall 423 has been respectively formed on limit hole 421.Protrusion 52 is at least inserted into two opposite sides Limit hole 421 on wall 423 can guarantee that protrusion 52 is limited from opposite two sides in this way, to improve locating effect, keep away Exempt from interconnecting piece 42 to shake during the welding process.

Referring to Fig. 7 and Fig. 8, limit hole 421 is preferably strip, and the limit hole 421 of strip is easy to process, while can also Enough maximize the area of limit hole 421.Side wall 423 is greater than 1mm in width L of the limit hole 421 along the end of extending direction, It is just able to satisfy requirement of the side wall 423 to intensity and conveyance capacity in this way.

The secondary cell further includes thermistor 6, connects the first tab 11 and main part 41.The resistance of thermistor 6 It is directly proportional to temperature.When secondary cell short circuit due to unexpected, the resistance of thermistor 6 can rapidly rise under high temperature action, To reduce electric current in circuit, electrode assembly 1 is avoided to damage at high temperature or on fire.

Thermistor 6 may be disposed at the different surfaces of main part 41.Specifically, in one embodiment, referring to Fig. 9, heat Quick resistance 6 may be disposed at the surface of the close electrode assembly 1 of main part 41, at this point, thermistor 6 and interconnecting piece 42 are located at The two sides of main part 41.First tab 11 is connected to the surface of the separate main part 41 of thermistor 6.In another embodiment, Referring to Fig.1 0, thermistor 6 may be disposed at the surface of the close lamina tecti 31 of main part 41, at this point, thermistor 6 and interconnecting piece 42 are located at the same side of main part 41.First tab 11 is connected to the surface of the separate main part 41 of thermistor 6.

Second embodiment is illustrated below.To simplify the description, second embodiment and first are only mainly introduced below The difference of embodiment, the part not described are referred to first embodiment and are understood.

Referring to Fig.1 1, in a second embodiment, limit hole 421 is simultaneously not penetrated side wall 423.Specifically, the application can rush Side wall 423 is pressed, to form groove in the outer surface of side wall 423, the groove can be used as limit hole 421.Alternatively, of course, Indentation, limit hole 421 of the indentation as the application can also be suppressed on the surface of side wall 423.

Claims (10)

1. a kind of secondary cell, including electrode assembly (1), shell (2), cap assembly (3), switching component (4) and insulator (5)；

Electrode assembly (1) is contained in shell (2)；

Cap assembly (3) includes lamina tecti (31) and first electrode terminal (32), and lamina tecti (31) is connected to shell (2) and has First end sub-aperture (311), first electrode terminal (32) are set to lamina tecti (31) and covering first end sub-aperture (311)；

Switching component (4) connection electrode component (1) and first electrode terminal (32), insulator (5) will switching component (4) and top covers Plate (31) separates；

Switching component (4) includes main part (41) and interconnecting piece (42), and main part (41) is set to the close electricity of lamina tecti (31) It the side of pole component (1) and is connected to electrode assembly (1), interconnecting piece (42) is from the separate electrode assembly (1) of main part (41) Side extends and protrudes into first end sub-aperture (311)；

Interconnecting piece (42) is connected to first electrode terminal (32) and is equipped with limit hole (421)；

Insulator (5) includes first part (51) and protrusion (52), and first part (51) is looped around the outside of interconnecting piece (42), convex (52) are played to extend from the side of the close interconnecting piece (42) of first part (51) and be inserted into limit hole (421).

2. secondary cell according to claim 1, which is characterized in that

Interconnecting piece (42) includes roof (422) and side wall (423), and roof (422) is fixed on first electrode terminal (32), side wall (423) main part (41) and roof (422) are connected；

Roof (422) and side wall (423) surround recess portion (424) of the opening towards electrode assembly (1), and limit hole (421) is at least A part is formed in side wall (423).

3. secondary cell according to claim 2, which is characterized in that limit hole (421) penetrates through side wall (423).

4. secondary cell according to claim 3, which is characterized in that raised (52) and limit hole (421) are interference fitted.

5. secondary cell according to claim 2, which is characterized in that limit hole (421) is multiple and along side wall (423) It is provided at circumferentially spaced, and raised (52) only in the limit hole (421) of insertion portion.

6. the secondary cell according to any one of claim 2-5, which is characterized in that side wall (423) is four and four Side wall (423) surrounds rectangular box.

7. secondary cell according to claim 6, which is characterized in that each side wall (423) has been respectively formed on limit hole (421), and raised (52) are at least inserted into the limit hole (421) on two opposite side walls (423).

8. secondary cell according to claim 7, which is characterized in that limit hole (421) is strip, and side wall (423) It is greater than 1mm in width of the limit hole (421) along the end of extending direction.

9. secondary cell according to claim 1, which is characterized in that the material of insulator (5) is flexible plastic cement.

10. secondary cell according to claim 1, which is characterized in that

Electrode assembly (1) includes the first tab (11)；

The secondary cell further includes thermistor (6), connects the first tab (11) and main part (41).