CN208849034U - A kind of secondary cell - Google Patents

Abstract

The embodiment of the present application provides a kind of secondary cell, comprising: shell has accommodating chamber；Electrode assembly is located in accommodating chamber；Lamina tecti is connected to shell；Pole is set to lamina tecti；Electrode assembly includes ontology and tab, and tab extends outwardly from ontology, and ontology has along two ends that secondary cell length direction L is distributed, and end includes first area and second area, and second area is located at the downside of first area；Switching piece is used for connecting tab and pole, at least partly relayed covering of first area, second area not relayed covering；Insulating part, jacketed electrode component, and there is the side plate being correspondingly arranged with end, side plate part corresponding with second area is equipped with through-hole.The intrinsic bubble of electrode assembly is expelled to insulating part from second area, it is discharged outside secondary cell by through-hole from insulating part, the risk that bubble occupies electrode assembly positive and negative anodes channel is reduced, the risk that analysis lithium phenomenon occurs for electrode assembly is reduced, improves the performance of secondary cell.

Description

A kind of secondary cell

[technical field]

This application involves energy storage device technical field more particularly to a kind of secondary cells.

[background technique]

Battery core includes electrode assembly, and the both ends of the electrode assembly are respectively connected with switching piece, in order to realize the exhausted of the battery core Edge, electrode assembly are wrapped up after being connected with switching piece by insulation system.

When the battery core works, electrochemical reaction occurs between positive and negative anodes, bubble, and the bubble generated are generated in reaction process It is present between positive and negative anodes, occupies the channel between positive and negative anodes, electrochemical reaction between the positive and negative anodes of the electrode assembly is caused to subtract It is weak, analysis lithium phenomenon occurs, reduces the performance of battery.

[utility model content]

In view of this, the embodiment of the present application provides a kind of battery and its secondary cell, it is electric in the prior art to solve The bubble of pole component internal can not be discharged and lead to the problem of analysis lithium phenomenon occurs.

The embodiment of the present application provides a kind of secondary cell, comprising:

Shell has accommodating chamber；

Lamina tecti is connected to the shell；

Pole is set to the lamina tecti；

Electrode assembly is located in the accommodating chamber, and the electrode assembly includes ontology and tab, the tab and the pole Column extends outwardly from the ontology, and the ontology has along two ends that the secondary cell length direction L is distributed, the end Portion includes first area and second area, and the second area is located at the downside of the first area；

Switching piece, for connecting the tab and the pole, the first area at least partly by the switching piece Covering, the second area are not covered by the switching piece；

Insulating part, coats the electrode assembly, and has the side plate being correspondingly arranged with the end, the side plate with it is described The corresponding part of second area is equipped with through-hole.

Preferably, the through-hole is only located at side plate part corresponding with the second area.

Preferably, the through-hole is multiple, and area ratio of the sum of the area of multiple through-holes with the second area It is 0.3~0.8.

Preferably, distribution density of the through-hole on the side plate is 2~6/cm2.

Preferably, the shape of the through-hole is one of circle, diamond shape, triangle or a variety of.

Preferably, the secondary cell further includes electrolyte, and the through-hole can also be used to electrolyte and flow into or out The insulating part.

Preferably, the insulating part includes bottom plate, front side board, back side panel, the first big panel and the second largest panel；

The first big panel is respectively connected with first point of side plate along the both ends of the secondary cell length direction L, and described Two big panels are respectively connected with second point of side plate along the both ends of the secondary cell length direction L；

Be overlapped positioned at first point of side plate of front side and second point of plate portion, and gluing, with formed it is described before Side plate；

Be overlapped positioned at first point of side plate of rear side and second point of plate portion, and gluing, with formed it is described after Side plate；

First point of side plate is connected with the through-hole of second point of side plate lap.

Preferably, the switching piece includes tab interconnecting piece, pole interconnecting piece and guide plate, and the tab interconnecting piece is used for It is connected with the tab, the pole interconnecting piece with the pole of the electrode assembly for being connected；

The tab interconnecting piece and the pole interconnecting piece are connected to the guide plate；

The guide plate is correspondingly arranged with the side plate, and the first area is at least partly covered by the guide plate Lid.

Preferably, the area ratio of the area of the guide plate and the first area is 1/3~3/4.

In the application, due to the second area of ontology in electrode assembly not relayed cover, the sheet of electrode assembly The bubble in internal portion can be expelled in insulating part from the second area；Meanwhile in the side plate of insulating part, with above-mentioned second area Corresponding position offers through-hole, by each through-hole, can be realized bubble and is expelled to outside secondary cell in time out of insulating part, It reduces bubble and occupies the risk in positive and negative anodes channel in electrode assembly, to reduce the risk that analysis lithium phenomenon occurs for electrode assembly, mention The performance and used life of high 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 structural schematic diagram of the secondary cell provided herein in the first specific embodiment；

Fig. 2 removes structural schematic diagram when insulating part for the secondary cell in Fig. 1；

Fig. 3 is the structural schematic diagram of insulating part in Fig. 1；

Fig. 4 is structural schematic diagram of the secondary cell provided herein in second of specific embodiment；

Fig. 5 is the structural schematic diagram of insulating part in Fig. 4.

Appended drawing reference:

1 insulating part

11 front side boards

111 first points of side plates

112 second points of side plates

113 through-holes

114 first notches

115 second notches

12 first big panels

The 13 second largest panels

14 bottom plates

15 folding lines

2 lamina tectis

3 electrode assemblies

31 ontologies

311 first areas

312 second areas

32 tabs

4 switching pieces

41 tab interconnecting pieces

42 guide plates

5 poles

[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 1-5, wherein Fig. 1 is knot of the secondary cell provided herein in the first specific embodiment Structure schematic diagram；Fig. 2 removes structural schematic diagram when insulating part for the secondary cell in Fig. 1；Fig. 3 is the structure of insulating part in Fig. 1 Schematic diagram；Fig. 4 is structural schematic diagram of the secondary cell provided herein in second of specific embodiment；Fig. 5 is exhausted in Fig. 4 The structural schematic diagram of edge part.

In a specific embodiment, the application provides a kind of secondary cell, as depicted in figs. 1 and 2, the secondary cell packet Shell and lamina tecti 2 are included, enclosure interior has accommodating chamber, which is used to accommodate each component of the secondary cell, and passes through Lamina tecti 2 is closed, and the lamina tecti 2 is also connected with pole 5.Wherein, the component in accommodating chamber includes electrode assembly 3, turns Contact pin 4 and insulating part 1, as shown in Fig. 2, the electrode assembly 3 includes ontology 31 and the tab 32 extended from ontology 31, and should Electrode assembly 3 has opposite positive and negative anodes, in Fig. 1, Fig. 2 and embodiment shown in Fig. 4, the electrode assembly 3 it is positive and negative extremely electric The both ends of the L along its length of pole component 3, therefore, the length direction L of secondary cell refers to the distribution with secondary battery anode and cathode The identical direction in direction.

Specifically, as shown in Fig. 2, in the electrode assembly 3, ontology 31 has two be distributed along secondary cell length direction L A end, and each end includes first area 311 and second area 312, first area 311 and second area 312 are along secondary electricity The height direction H in pond is distributed, and second area 312 is located at the lower section of first area 311.

Meanwhile as shown in Fig. 2, the secondary cell further includes two switching pieces 4, which is used for connecting tab 32 and pole Column 5, two switching pieces 4 are respectively arranged on the positive and negative anodes of electrode assembly 3, and corresponding with the both ends of ontology 31 respectively.Wherein, above-mentioned At least partly relayed 4 of the first area 31 of 31 end of body covering, and second area 312 not relayed 4 covering, this Two regions 312 are A along the size of height direction H.

It should be noted that " at least partly relayed 4 covering of first area 31 " refers to: the first area 311 Size along height direction H is identical as the size of 4 short transverse of switching piece, and the size of 311 through-thickness W of the first area No more than the size of 4 thickness direction W of switching piece, at this point, first area all covers (not shown) for 311 relayed 4； Alternatively, the first area 311 is identical as the size of 4 short transverse of switching piece along the size of height direction H, and first area 311 The size of through-thickness W is greater than the size of 4 through-thickness W of switching piece, at this point, the part of first area 311 relayed 4 It covers (embodiment as shown in Figure 2).

Further, as shown in Figure 1 and Figure 4, which further includes insulating part 1, which is and electrode assembly 3 compatible insulation boxes, electrode assembly 3 are located in the insulating part 1, to provide insulation protection for electrode assembly 3.Such as Fig. 1 With shown in Fig. 4, L has side plate to the insulating part 1 along its length, and both ends of the side plate respectively with ontology 31 are correspondingly arranged, Specifically, which includes front side board 11 and back side panel, and front side board 11 and back side panel are respectively used to the anode of covering electrode group part 3 Side and negative side.

In the secondary cell course of work, bubble can be generated in electrode assembly 3 in positive and negative anodes electrochemical reaction process, the gas Bubble can occupy positive and negative anodes channel when assembling in electrode assembly 3, and analysis lithium phenomenon occurs so as to cause the electrode assembly 3, reduces by two The performance and used life of primary cell.In the application, mainly promote bubble discharge electricity by opening up through-hole 113 in insulating part 1 Pole component 3 solves above-mentioned technical problem.

Specifically, the side plate of insulating part 1 is corresponding with the both ends of 3 ontology 31 of electrode assembly, and switching piece 4 and side plate It is a part of corresponding, wherein " corresponding " refers to the part that the projection of two components coincides.In the present embodiment, insulating part 1 The end of side plate, switching piece 4 and electrode assembly 3 is the plate structure being parallel to each other, therefore, the top of side plate and electrode assembly 3 The first area 311 of end is corresponding, and lower part is corresponding with second area 312, and the side plate is corresponding with second area 312 Part is provided with through-hole 113.

In the application, due to the second area 312 of ontology 31 in electrode assembly 3 not relayed 4 cover, electrode Bubble inside the ontology 311 of component 31 can be expelled in insulating part 1 from the second area 312；Meanwhile such as Fig. 1 and Fig. 4 institute Show, in the front side board 11 and back side panel of insulating part 1, position corresponding with above-mentioned second area 312 offers through-hole 113, passes through Each through-hole 113 can be realized bubble and be expelled to outside secondary cell out of insulating part 1, reduces bubble and occupies in electrode assembly 3 just The risk in cathode channel, to reduce the risk that analysis lithium phenomenon occurs for electrode assembly 3, improve the performance of secondary cell and use the longevity Life.

Specifically, as shown in Figure 1, in front side board 11 and back side panel, position corresponding with above-mentioned second area 312 is the side The throughput of plate, above the throughput, the non-negotiable portion that position corresponding with first area 311 is the side plate, therefore, this The throughput of side plate offers multiple above-mentioned through-holes 113, meanwhile, non-negotiable portion is not provided with above-mentioned through-hole 113, i.e. through-hole 113 only It is opened in side plate part corresponding with second area 312.

As shown in Figure 1 and Figure 4, each through-hole 113 is in array distribution on corresponding side plate, forms array hole.Wherein, through-hole 113 shape can be one of round, rectangular, triangle, diamond shape or a variety of.Certainly, 113 shape of through-hole in the present embodiment Selection, which can comprehensively consider, to be reduced difficulty of processing and promotes bubble that both sides factor is discharged.

In addition, the sum of area of above-mentioned multiple through-holes 113 is 0.3~0.8 with 312 area ratio of second area.For example, the two Area ratio can be 0.5.

In the present embodiment, when the sum of 113 area of through-hole (less than 0.3) too small with the area ratio of second area 312, insulation The rate of bubble discharge insulating part 1 in part 1 discharges into the rate of insulating part 1 lower than bubble in electrode assembly 3, leads to insulating part 1 Internal pressure increases, and the bubble in electrode assembly 3 can not normally discharge into insulating part 1, so as to cause positive and negative inside electrode assembly 3 Pole channel is occupied by bubble, is caused to analyse the generation of lithium phenomenon, is influenced the performance of secondary battery core.When the sum of 113 area of through-hole and second When 312 area ratio of region excessive (being greater than 0.8), the intensity of the side plate is substantially reduced, and causes the intensity of insulating part 1 insufficient, and electricity There is the risk for passing through through-hole 113 and the short circuit of secondary cell shell in pole component 3.Based on this, in the present embodiment, the face of through-hole 113 The sum of product is preferably 0.3~0.8 with 312 area ratio of second area.

Specifically, distribution density of the above-mentioned through-hole 113 on corresponding side plate is 2~6/cm2.Such as through-hole 113 Distribution density can be 4/cm2.

In the present embodiment, according to the sum of the distribution density of through-hole 113,113 area of through-hole and 312 area ratio of second area The area of settable through-hole 113, so that the side plate after setting through-hole 113 meets the circulating rate requirement and intensity requirement of bubble.

On the other hand, as shown in Figure 1 and Figure 4, in the insulating part 1 of secondary cell, bottom plate 14 and both side plate and two big faces It is realized and is connected by gluing between plate, so that gap or gap very little is not present in 1 bottom of insulating part, cause to be electrolysed Liquid cannot be introduced into insulating part 1 or lower into the rate of insulating part 1, so that the degree of electrolyte infiltration electrode assembly 3 is reduced, Influence the rate and efficiency of electrochemical reaction.

In the present embodiment, above-mentioned each through-hole 113 is except for being discharged in addition to the bubble inside electrode assembly 3, additionally it is possible to for electricity Solution liquid flows into or out electrode assembly 3, is entered absolutely so that electrolyte is removed by the gap of 1 bottom of insulating part and side Other than the inside of edge part 1, additionally it is possible to enter inside insulating part 1 from the through-hole 113, and after electrolyte enters insulating part 1, make in capillary It can flow up under, be contacted with corresponding switching piece 4.Simultaneously as the front side board 11 and back side panel of the insulating part 1 open up There is above-mentioned through-hole 113, electrolyte is entered in insulating part 1 by the through-hole 113 of both side plate, improves infiltration electrolyte Rate and efficiency.

In the above various embodiments, as shown in Figs. 1-5, above-mentioned insulating part 1 includes bottom plate 13, front side board 11, back side panel, first Big panel 12 and the second largest panel 13, wherein bottom plate 13 and lamina tecti 2 are distributed along the height direction H of secondary cell, front side board 11 With back side panel along the length direction L distribution of secondary cell, the first big panel 12 and the second largest panel 13 along the thickness of secondary cell Direction W distribution, and bottom plate 13, front side board 11, back side panel, the first big panel 12 and the second largest panel 13 are panel structure, Concretely structure made of polypropylene or polypropylene material.Meanwhile as shown in Figure 1 and Figure 4, bottom plate 13, front side board 11, rear side Plate, the first big panel 12 and the second largest panel 13 surround the insulating part 1 of rectangular parallelepiped structure, when electrode assembly 3 is placed in the insulation When in part 1, the electrode assembly 3 can be covered from bottom and four sides.

Specifically, as shown in Figure 1 and Figure 4, front side board 11 and back side panel are located at the two sides of the insulating part 1 L along its length Face, the first big panel 12 and the second largest panel 13 are located at the two sides of 1 through-thickness W of the insulating part, bottom plate 14 and both side plate It is connected with the bottom of two big panels.

Further, as shown in Figure 1 and Figure 4, above-mentioned front side board 11 and back side panel are by two boards (first point of 111 He of side plate Second point of side plate 112) it is spliced, as shown in Figure 3 and Figure 5, the two sides of the first big panel 12 L along its length are all connected with There is first point of side plate 111, the two sides of the second largest panel 13 L along its length are respectively connected with second point of side plate 112, therefore, when When the insulating part 1 forms, first point of side plate 111 and second point of connection of side plate 112 on front side of big panel form front side board 11, First point of side plate 111 and second point of connection of side plate 112 on rear side of big panel form back side panel.

Specifically, as shown in Figure 1 and Figure 4, it partly overlaps positioned at first point of side plate 111 of front side and second point of side plate 112, And gluing, to form front side board 11；Meanwhile first point of side plate 111 positioned at rear side and second point of side plate 112 partly overlap, and Gluing, to form back side panel.

Alternatively, it is located at first point of side plate 111 and the whole overlappings of second point of side plate 112 of front side, and gluing, it is above-mentioned to be formed Front side board 11；Meanwhile positioned at first point of side plate 111 of rear side and second point of all overlapping, and gluing of side plate 112, after being formed Side plate.

Wherein, above-mentioned first point of side plate 111 and second point of side plate 112 are provided with above-mentioned through-hole 113, and when first point of side When plate 111 is Chong Die with second point of side plate 112, the through-hole 113 of the two lap is connected, to guarantee the gas in electrode assembly 3 Bubble can smoothly be discharged from the through-hole 113, and guarantee that electrolyte can flow into or out insulating part 1 by the through-hole 113.

Therefore, in the application, the both side plate of insulating part 1 is formed by independent two insulation boards gluing, and forms side plate It partly overlaps between two insulation boards or whole is overlapped, being accumulated by glue surface when so as to increase two insulation board gluings, to improve two The reliability of gluing between insulation board, and then the intensity of the side plate is improved, guarantee the insulation performance of 1 side of insulating part.Meanwhile The above-mentioned set-up mode can also reduce operation difficulty when two insulation board gluings, reduce processing cost.

It should be noted that there is inside after being located at first point of side plate 111 and second point of overlapping of side plate 112 of the same side Plate and outer panel, wherein interior plate refers to that the insulation board that inside is located fully or partially at after being overlapped, outer panel refer to being overlapped It is entirely located in the insulation board in outside afterwards.In embodiment as shown in Figure 1, first point of side plate 111 and second point of 112 part of side plate Overlapping, and first point of side plate 111 is the interior plate positioned inside, second point of side plate 112 is the outer panel positioned at outside.

Specifically, as shown in Figure 1, it is viscous by single side adhesive tape positioned at first point of side plate 111 of front side and second point of side plate 112 Patch forms front side board 11, is pasted, is formed by single side adhesive tape positioned at first point of side plate 111 of institute of rear side and second point of side plate 112 Back side panel.Meanwhile the single side adhesive tape is pasted on the outside of the front side board and back side panel, and therefore, embodiment shown in FIG. 1 is come It says, which pastes the exterior portion (part not covered by second point of side plate 112) and second of first point of side plate 111 Divide side plate 112.

Therefore, in the present embodiment, when first point of side plate 111 and second point of side plate 112 partly overlap, after the two overlapping, Both side plate is pasted by single side adhesive tape, has structure simple, is pasted easily a little, and is additionally aided using single side adhesive tape Save cost.

Further, the side plate that outside is entirely located in after overlapping offers the first notch 114, embodiment shown in Fig. 4 In, the side plate that outside is entirely located in after overlapping is second point of side plate 114, therefore, is somebody's turn to do in the edge of second point of side plate 114 First notch 114, single side adhesive tape paste first point of side plate 111 and second point of side plate 112 by first notch 114.

In the present embodiment, by opening up the first notch 114 in the side plate for being located at outside, it is capable of increasing the side plate positioned inside Area exposed to the outside, to improve interior plate when single side adhesive tape pastes first point of side plate 111 and second point of side plate 112 By glue surface product, and then improve the reliability pasted.

In another embodiment, when being located at first point of side plate 111 and completely overlapped second point of side plate 112 of the same side, It is located at outside since first point of side plate 111 and second point of side plate 112 only have a side plate, in order to realize the gluing of the two, The present embodiment uses double-sided adhesive tape, and the double-sided adhesive tape be set to first point of side plate 111 after overlapping and second point of side plate 112 it Between, to realize the gluing of the two.

In the present embodiment, first point of side plate 111 and second point of side plate 112 be by glue surface product double-sided adhesive tape area, Therefore, have the advantages that by glue surface product it is big, can be improved the intensity and insulating reliability of front side board 11 and back side panel.

On the other hand, as shown in Figure 1 and Figure 4, after first point of side plate 111 and second point of side plate 112 are overlapped, it is located at outside Side plate bottom be provided with the second notch 115.In the present embodiment, the side plate positioned at outside is second point of side plate 112, therefore, should The bottom of second point of side plate 112 is provided with the second notch 115.

When the secondary cell is installed in aluminum hull, which can avoid aluminum hull, prevent from stopping due to aluminum hull And cause secondary cell that can not be packed into aluminum hull.Therefore, the shape of second notch 115 is unrestricted.

In the above various embodiments, as shown in Figure 2 and Figure 4, above-mentioned bottom plate 4, the first big panel 12, the second largest panel 13, One point of side plate 111 and second point of side plate 112 are integrally formed, and bottom plate 14 is connected with the first big panel 12, the second largest panel 13, Its connecting place is provided with folding line 15, so that the first big panel 12 and the second largest panel 13 can be turned over easily relative to bottom plate 14 90 ° of folding.Meanwhile first big panel 12 be connected with first point of 111 connecting place of side plate, the second largest panel 13 with second point of side plate 112 Place is provided with folding line 15, so that first point of side plate 111 and second point of side plate 112 can be relative to corresponding 90 ° of big panels Fold, to contribute to form above-mentioned insulating part 1.

Certainly, the two sides of the above-mentioned first big panel 12 can also connect two second points of side plates 112, and the two of the second largest panel 13 Side connects two first points of side plates 111, wherein second point of side plate 112 poststack of attaching most importance to is located at the side plate in outside.Alternatively, this is first big The two sides of panel 12 can be separately connected first point of side plate 111 and second point of side plate 112, and the two sides of the second largest panel 13 are separately connected Second point of side plate 112 and first point of side plate 111, wherein second point of side plate 112 poststack of attaching most importance to is located at the side plate in outside, and is located at The side plate in outside is provided with through-hole 113, is additionally provided with the first notch 114 and the second notch 115.

Specifically, when the secondary cell in the application forms, after lamina tecti 2 is welded in electrode assembly 3, by electrode assembly 3 Bottom surface be aligned with the bottom plate 14 of insulating part 1 in the application, then successively big panel and side plate are turned down along folding line 15, so that two big Panel is (long by two electrode sides covering of electrode assembly 3 respectively by the covering of two of electrode assembly 3 big face, four side plates respectively Spend direction L), realize the insulation covering of electrode assembly 3.

In the above various embodiments, as shown in Fig. 2, tab 32 is stretched out from the both ends of ontology 31, pole in the electrode assembly 3 Column 5 is connected to lamina tecti 2, and extends along the height direction H of secondary cell, meanwhile, the tab 32 and pole 5 pass through switching piece 4 Realize electrical connection.The switching piece 4 includes tab interconnecting piece 41 and pole interconnecting piece (not shown), wherein tab interconnecting piece 41 L extensions along its length, and be connected with tab 32 (tab 32 and tab interconnecting piece 41 weld), pole connecting portion is in ontology Between 31 top and lamina tecti 2, it is connected for the pole 5 with electrode assembly 3, since tab 32 and pole 5 are mutually perpendicular to, because This, tab interconnecting piece 41 and pole interconnecting piece are perpendicular, are connected by guide plate 42 therebetween, to realize tab 32 and pole The electrical connection of column 5.

Wherein, as shown in Fig. 2, guide plate 42 is correspondingly arranged with the end of ontology 31 and the side plate of insulating part 1, specifically Ground, the guide plate 42 is parallel with side plate, and in the side plate, and first area 311 is at least partly covered by the guide plate 42.

Further, the area ratio of the area of the guide plate 42 and first area 311 is 1/3~3/4.

Therefore, in the present embodiment, a part (1/3~3/4) of first area 311 is directed to the covering of plate 42, and when guiding When plate 42 covers the area excessive (be greater than 3/4) of first area 311, tab 32 and tab interconnecting piece 41 are from the end of ontology 31 After L stretches out along its length, the space of 3 through-thickness W of electrode assembly may be occupied, the compactedness of secondary cell is unfavorable for. When guide plate 42 covers area too small (less than 1/3) of first area 311, because 42 area of guide plate is smaller, lead to its overcurrent Area is smaller, and when secondary cell long-term work, which has the risk of fever at guide plate 42.Based on this, this implementation In example, the area of guide plate 42 and the area ratio of first area 311 are preferably 1/3~3/4.

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 (9)

1. a kind of secondary cell, comprising:

Shell has accommodating chamber；

Lamina tecti is connected to the shell；

Pole is set to the lamina tecti；

Electrode assembly is located in the accommodating chamber, and the electrode assembly includes ontology and tab, the tab from the ontology to Outer extension, the ontology have along two ends that the secondary cell length direction L is distributed, and the end includes first area And second area, the second area are located at the downside of the first area；Switching piece, for connecting the tab and the pole Column, the first area are at least partly covered by the switching piece, and the second area is not covered by the switching piece；

Insulating part coats the electrode assembly, and has the side plate being correspondingly arranged with the end, the side plate and described second The corresponding part in region is equipped with through-hole.

2. secondary cell according to claim 1, which is characterized in that the through-hole is only located at the side plate and described second The corresponding part in region.

3. secondary cell according to claim 2, which is characterized in that the through-hole is multiple, and multiple through-holes The area ratio of the sum of area and the second area is 0.3~0.8.

4. secondary cell according to claim 1, which is characterized in that distribution density of the through-hole on the side plate be 2~6/cm2.

5. secondary cell according to claim 1, which is characterized in that the shape of the through-hole is circle, diamond shape, triangle One of or it is a variety of.

6. secondary cell according to any one of claims 1 to 5, which is characterized in that the secondary cell further includes electricity Liquid is solved, the through-hole can also be used to electrolyte and flow into or out the insulating part.

7. secondary cell according to any one of claims 1 to 5, which is characterized in that the insulating part includes bottom plate, preceding Side plate, back side panel, the first big panel and the second largest panel；

The first big panel is respectively connected with first point of side plate along the both ends of the secondary cell length direction L, described second largest Panel is respectively connected with second point of side plate along the both ends of the secondary cell length direction L；

It is overlapped positioned at first point of side plate of front side and second point of plate portion, and gluing, to form the front side board；

It is overlapped positioned at first point of side plate of rear side and second point of plate portion, and gluing, to form the back side panel；

First point of side plate is connected with the through-hole of second point of side plate lap.

8. secondary cell according to any one of claims 1 to 5, which is characterized in that

The switching piece includes tab interconnecting piece, pole interconnecting piece and guide plate, and the tab interconnecting piece is used for and the tab It is connected, the pole interconnecting piece with the pole for being connected；

The tab interconnecting piece and the pole interconnecting piece are connected to the guide plate；

The guide plate is correspondingly arranged with the side plate, and the first area is at least partly covered by the guide plate.

9. secondary cell according to claim 8, which is characterized in that the area of the guide plate and the first area Area ratio is 1/3~3/4.