CN214956989U - Lamination structure and soft-packaged battery cell - Google Patents

Abstract

The utility model relates to a battery field provides a lamination and laminate structure and laminate core. The lamination structure comprises a negative plate, a positive plate and a diaphragm plate, wherein a first through hole is formed in the middle of the negative plate, and a first negative electrode lug and a second negative electrode lug which are oppositely arranged are connected to the edge of the first through hole; the positive plate is inserted between two adjacent negative plates, the middle part of the positive plate is provided with a second through hole which is aligned with the first through hole, the edge of the second through hole is connected with a first positive lug and a second positive lug which are oppositely arranged, and the first positive lug and the second positive lug are staggered with the first negative lug and the second negative lug in the thickness direction; the middle part of the diaphragm is provided with a third through hole. When the soft package battery cell manufactured by the lamination structure is charged under a high-rate and/or low-temperature environment, the current can be uniformly distributed to all positions of the negative plate through the first negative electrode lug and the second negative electrode lug and can be uniformly distributed to all positions of the positive plate through the first positive electrode lug and the second positive electrode lug, so that the distribution uniformity of the current density can be improved.

Description

Lamination structure and soft-packaged battery cell

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a lamination and soft-packaged electrical core.

Background

The lamination structure of traditional laminate core includes a plurality of negative pole pieces, at least one range upon range of positive plate between two adjacent negative pole pieces of range upon range of setting along the thickness direction usually to and separate the diaphragm between adjacent negative pole piece and positive plate, wherein, in one side of lamination structure, the negative pole piece is protruding to be equipped with the negative pole ear, and the positive plate is protruding to be equipped with in the thickness direction with the positive ear that the negative pole ear staggers.

However, when the soft package battery cell manufactured based on the above lamination structure is charged under a high-rate and/or low-temperature environment, the current densities of the positive plate and the negative plate are easily distributed unevenly, so that the problems of lithium precipitation, low capacity, low power density, serious heat generation, poor cycle and the like are easily caused.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a lamination structure to when solving the soft-packaged electrical core that current lamination structure made and charging under big multiplying power and/or low temperature environment, the current density of positive plate and negative pole piece easily distributes inhomogeneous technical problem.

In order to achieve the above object, the utility model adopts the following technical scheme: a lamination stack, comprising:

the cathode plates are stacked along the thickness direction, the middle parts of the cathode plates are provided with first through holes, the edges of the first through holes are connected with first cathode lugs and second cathode lugs which are oppositely arranged, the first cathode lugs of the cathode plates are stacked along the thickness direction, and the second cathode lugs of the cathode plates are stacked along the thickness direction;

the positive plate is inserted between two adjacent negative plates, a second through hole which is aligned with the first through hole is formed in the middle of the positive plate, the edge of the second through hole is connected with a first positive lug and a second positive lug which are oppositely arranged, the first positive lug of each positive plate is arranged in a stacking mode in the thickness direction of the positive plate, the second positive lug of each positive plate is arranged in a stacking mode in the thickness direction of the positive plate, and the first positive lug and the second positive lug are staggered with the first negative lug and the second negative lug in the thickness direction;

and the plurality of diaphragm sheets are separated between the adjacent negative pole sheets and the positive pole sheets, and the middle parts of the diaphragm sheets are provided with third through holes which are aligned with the first through holes and the second through holes.

Through adopting above-mentioned scheme, when the soft-packaged electrical core that laminated structure made charges under big multiplying power and/or low temperature environment, the electric current can be via locating the middle part of negative pole piece and relative first negative pole ear and the positive ear evenly distributed to the each department of negative pole piece of first negative pole ear and the positive ear evenly distributed to the each department of positive pole piece of relative first positive pole ear and the positive ear evenly distributed of second that set up of middle part and relative of positive pole piece, thereby can ensure and improve the current density distribution homogeneity of each positive pole piece and each negative pole piece of laminated structure, and then can reduce the soft-packaged electrical core that laminated structure made to a certain extent and appear the risk of separating lithium, low-capacitance, power density is low, the heat production is serious, poor scheduling problem.

In one embodiment, a first connection line between the geometric center of the first positive tab and the geometric center of the second positive tab passes through the center of the second through hole, a second connection line between the geometric center of the first negative tab and the geometric center of the second negative tab passes through the center of the first through hole, and the first connection line and the second connection line are arranged perpendicularly.

By adopting the scheme, the first positive tab and the second positive tab can be symmetrically distributed relative to the center of the second through hole, and on the basis, when the soft package battery cell manufactured by the lamination structure is charged under a high-rate and/or low-temperature environment, the current can be further promoted to be uniformly distributed to all positions of the positive plate through the first positive tab and the second positive tab which are symmetrically distributed relative to the center of the second through hole; similarly, the first negative electrode tab and the second negative electrode tab can be symmetrically distributed relative to the center of the first through hole, and based on this, when the soft package battery cell manufactured by the lamination structure is charged under a high-rate and/or low-temperature environment, the current can be further promoted to be uniformly distributed to all positions of the negative electrode sheet through the first negative electrode tab and the second negative electrode tab which are symmetrically distributed relative to the center of the first through hole; therefore, the current density distribution uniformity of each positive plate and each negative plate of the laminated structure can be improved. In addition, the connecting line of the first positive tab and the second positive tab and the connecting line of the first negative tab and the second negative tab are perpendicularly arranged, and the distance between the first positive tab and the second positive tab and the distance between the first negative tab and the second negative tab can be effectively pulled open, so that the lap short circuit between the first positive tab and the second positive tab and the lap short circuit between the first negative tab and the second negative tab can be further avoided, and the use performance of the laminated structure can be further ensured and improved.

In one embodiment, the second through hole, the first through hole and the third through hole are all rectangular holes or circular holes or hexagonal holes or other polygonal holes with central symmetry.

By adopting the above scheme, the second through hole, the first through hole and the third through hole which are regular in shape and are centrosymmetric can be formed, so that the current density distribution uniformity from the first through hole to each part of the negative plate and from the second through hole to each part of the positive plate can be further improved.

In one embodiment, the first through hole is provided with two parallel first edges, and the first negative electrode tab and the second negative electrode tab are respectively connected to the two first edges; the second through hole is provided with two second edges which are parallel and vertical to the first edge, and the first positive lug and the second positive lug are respectively connected to the two second edges.

Through adopting above-mentioned scheme, can make first anodal ear, first negative pole ear, the anodal ear of second and second negative pole ear distribute in the four sides of rectangle relatively respectively, based on this, can effectively stagger the position that sets up of first anodal ear, first negative pole ear, the anodal ear of second and second negative pole ear to can further avoid the anodal ear of first anodal ear and second and first negative pole ear and second negative pole ear to take place the overlap joint short circuit, can further improve lamination structure's performance.

In one embodiment, the first negative electrode tab and the second negative electrode tab are respectively arranged in the middle of the two first edges; the first positive lug and the second positive lug are respectively arranged in the middle of the two second edges.

Through adopting above-mentioned scheme, can avoid first anodal ear and the positive ear of second and the basis of first negative pole ear and the overlap joint short circuit of second negative pole ear, make first negative pole ear and the setting placed in the middle of the second negative pole ear, and make first anodal ear and the positive ear of second set up placed in the middle, thereby can be when the soft packet battery core that lamination structure made charges under big multiplying power and/or low temperature environment, further make the electric current through the first negative pole ear placed in the middle and each department of second negative pole ear evenly distributed to the negative pole piece, and further make the electric current through the first anodal ear placed in the middle and each department of the anodal ear evenly distributed to the positive pole piece of second, thereby can improve each positive pole piece of lamination structure and the current density distribution homogeneity of each negative pole piece.

In one embodiment, the first through hole has a cross-sectional dimension smaller than that of the second through hole, and the third through hole has a cross-sectional dimension smaller than that of the first through hole.

By adopting the scheme, the negative pole piece can be ensured to basically cover the positive pole piece, and based on the scheme, the negative pole piece can be ensured to basically receive lithium ions provided by the positive pole piece without omission, so that the service performance of the laminated structure can be ensured; and the diaphragm can basically cover the negative plate, so that the isolation effect of the diaphragm on electrons between the positive plate and the negative plate can be ensured, and the service performance of the laminated structure can be further ensured.

In one embodiment, the plate surface size of the negative plate is larger than that of the positive plate, and the plate surface size of the diaphragm plate is larger than that of the negative plate.

Through adopting above-mentioned scheme to combine the setting of last embodiment, can be at each negative pole piece of lamination structure, each positive plate and each diaphragm piece when counterpointing in the thickness direction, guarantee negative pole piece can cover the positive plate completely, and the diaphragm piece can cover the negative plate completely, based on this, can guarantee basically that the negative pole piece can receive the lithium ion that the positive plate provided without omitting, and the diaphragm piece can form reliable isolation effect to the electron between positive plate and negative pole piece, thereby can further ensure lamination structure's performance.

The utility model provides a purpose still lies in providing a soft-packaged electrical core, including lamination.

By adopting the scheme, the risk of problems of lithium precipitation, low capacity, low power density, serious heat generation, poor circulation and the like of the soft package battery core can be reduced.

In one embodiment, the soft package battery cell further comprises a first negative conductive handle, a second negative conductive handle, a first positive conductive handle and a second positive conductive handle, wherein each first negative tab is bent along the first direction and welded to the first negative conductive handle, each second negative tab is bent along the first direction and welded to the second negative conductive handle, and the second negative conductive handle is further welded to the first negative conductive handle; each first positive lug is bent along the second direction and welded on the first positive conductive handle, each second positive lug is bent along the second direction and welded on the second positive conductive handle, and the second positive conductive handle is also welded with the first positive conductive handle; wherein the second direction is opposite to the first direction.

Through adopting above-mentioned scheme, can form the negative pole and the positive pole of soft-packaged electrical core respectively in the relative both sides on the thickness direction of soft-packaged electrical core, wherein, the negative pole of soft-packaged electrical core is buckled by each first negative pole ear and is buckled and weld in the electrically conductive handle of first negative pole, each second negative pole ear is buckled and weld in the electrically conductive handle of second negative pole, and the electrically conductive handle of first negative pole and the electrically conductive handle welding of second negative pole form, the positive pole of soft-packaged electrical core is buckled and is welded in the electrically conductive handle of first positive pole ear by each first positive pole ear, each second positive pole ear is buckled and is welded in the electrically conductive handle of second positive pole, and the electrically conductive handle welding of first positive pole and second forms, on this basis, can be on the basis of guaranteeing current density distribution homogeneity, improve the performance of soft-packaged electrical core.

In one embodiment, the soft package cell further comprises an insulating glue, and the insulating glue is connected with the bent first negative electrode tab and the bent second negative electrode tab or connected with the bent first positive electrode tab and the bent second positive electrode tab so as to prevent contact short circuit.

By adopting the scheme, the contact short circuit can be effectively prevented by the insulating glue, so that the service performance and the safety performance of the soft package battery cell can be further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a front view of a negative electrode sheet according to an embodiment of the present invention;

fig. 2 is a front view of a positive plate provided in an embodiment of the present invention;

fig. 3 is a front view of a lamination stack according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

100-lamination, 110-negative plate, 111-first through hole, 1111-first edge, 112-first negative tab, 113-second negative tab, 120-positive plate, 121-second through hole, 1211-second edge, 122-first positive tab, 123-second positive tab.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes the specific implementation of the present invention in more detail with reference to specific embodiments:

referring to fig. 1, 2, and 3, an embodiment of the present invention provides a lamination structure 100, including a plurality of negative electrode sheets 110, at least one positive electrode sheet 120, and a plurality of separator sheets, wherein the plurality of negative electrode sheets 110 are stacked along a thickness direction thereof, a first through hole 111 is formed in a middle portion of the negative electrode sheet 110, and a first negative electrode tab 112 and a second negative electrode tab 113 which are oppositely disposed are connected to an edge of the first through hole 111, the first negative electrode tab 112 of each negative electrode sheet 110 is stacked along the thickness direction thereof, and the second negative electrode tab 113 of each negative electrode sheet 110 is stacked along the thickness direction thereof; the positive plate 120 is inserted between two adjacent negative plates 110, the middle of the positive plate 120 is provided with a second through hole 121 aligned with the first through hole 111, the edge of the second through hole 121 is connected with a first positive tab 122 and a second positive tab 123 which are oppositely arranged, the first positive tab 122 of each positive plate 120 is stacked in the thickness direction, the second positive tab 123 of each positive plate 120 is stacked in the thickness direction, and the first positive tab 122 and the second positive tab 123 are staggered with the first negative tab 112 and the second negative tab 113 in the thickness direction; the separator (not shown) is separated between the adjacent negative electrode sheet 110 and the positive electrode sheet 120, and a third through hole (not shown) aligned with the first through hole 111 and the second through hole 121 is formed in the middle of the separator.

It should be noted that, one positive plate 120 is inserted between two adjacent negative plates 110, and both sides of the whole lamination structure 100 are generally the negative plates 110, so the number of the positive plates 120 is generally one less than that of the negative plates 110, and based on this, the two sides of the positive plate 120 facing the two negative plates 110 can be promoted to discharge relatively uniformly, so that the arching phenomenon of the positive plate 120 due to the non-uniform discharge of the two sides can be avoided, and the falling amount of the active material of the positive plate 120 can be effectively reduced.

And a diaphragm is arranged between the adjacent negative pole pieces 110 and the positive pole pieces 120, the number of the diaphragm is basically equal to twice that of the positive pole pieces 120, the diaphragm can separate the positive pole pieces 120 and the negative pole pieces 110, electrons cannot freely pass through the diaphragm, and ions in the electrolyte can freely pass through the diaphragm. Of course, on the basis of not affecting the service performance of the separator sheet, the positive electrode sheet 120 and the negative electrode sheet 110, a plurality of separator sheets may be integrally connected, and this embodiment does not limit this.

After the negative electrode sheets 110, the positive electrode sheets 120 and the separator sheet form the laminated structure 100, the first through holes 111, the second through holes 121 and the third through holes are mostly overlapped in the thickness direction, that is, aligned.

It should be further noted that, in the middle of the negative electrode sheet 110, the first through hole 111, the first negative electrode tab 112, and the second negative electrode tab 113 may be formed by, but not limited to, die cutting, where the first negative electrode tab 112 and the second negative electrode tab 113 can be used together as a metal conductor for leading out the negative electrode sheet 110, and the first negative electrode tab 112 and the second negative electrode tab 113 are disposed opposite to each other, so that, when the soft pack cell manufactured by the lamination structure 100 is charged under a high-rate and/or low-temperature environment, the above arrangement may cause current to be uniformly distributed to all over the negative electrode sheet 110 through the first negative electrode tab 112 and the second negative electrode tab 113 that are disposed opposite to each other.

Similarly, in the middle of the positive electrode sheet 120, the second through hole 121, the first positive electrode tab 122 and the second positive electrode tab 123 can be formed by, but not limited to, die cutting, wherein the first positive electrode tab 122 and the second positive electrode tab 123 can be used together as a metal conductor for leading out the positive electrode sheet 120. And the second through hole 121 is aligned with the first through hole 111, and the first positive tab 122, the second positive tab 123, the first negative tab 112 and the second negative tab 113 are circumferentially spaced and do not substantially overlap in the thickness direction. Thus, a first positive tab 122 can be prevented from being shorted to the first and second negative tabs 112 and 113, and a second positive tab 123 can be prevented from being shorted to the first and second negative tabs 112 and 113. Meanwhile, when the soft package battery cell manufactured by the lamination structure 100 is charged in a high-rate and/or low-temperature environment, the arrangement can also promote the current to be uniformly distributed to all parts of the positive plate 120 through the oppositely arranged first positive tab 122 and second positive tab 123.

Correspondingly, in the middle of the diaphragm, the third through hole may be formed by, but not limited to, die cutting. Based on the arrangement of the third through hole, on the basis of the isolation effect of the barrier diaphragm, the electrical connection of the first negative electrode tabs 112 in the opposite position, the electrical connection of the second negative electrode tabs 113 in the opposite position, the electrical connection of the first positive electrode tabs 122 in the opposite position, and the electrical connection of the second positive electrode tabs 123 in the opposite position are facilitated.

Alternatively, the positive electrode tab 120 is a positive electrode tab 120 made of aluminum foil, and the negative electrode tab 110 is a negative electrode tab 110 made of copper foil.

In summary, by adopting the above-mentioned scheme, when the soft package battery cell manufactured by the lamination structure 100 is charged under a high rate and/or low temperature environment, the current can be uniformly distributed to each position of the negative electrode sheet 110 through the first negative electrode tab 112 and the second negative electrode tab 113 which are arranged in the middle of the negative electrode sheet 110 and are arranged oppositely, and can be uniformly distributed to each position of the positive electrode sheet 120 through the first positive electrode tab 122 and the second positive electrode tab 123 which are arranged in the middle of the positive electrode sheet 120 and are arranged oppositely, so that the current density distribution uniformity of each positive electrode sheet 120 and each negative electrode sheet 110 of the lamination structure 100 can be ensured and improved, and the risk of problems of lithium precipitation, low capacity, low power density, serious heat generation, poor cycle, and the like of the soft package battery cell manufactured by the lamination structure 100 can be reduced to a certain extent.

Referring to fig. 1, 2, and 3, in the present embodiment, a first connection line between the geometric center of the first positive tab 122 and the geometric center of the second positive tab 123 passes through the center of the second through hole 121, a second connection line between the geometric center of the first negative tab 112 and the geometric center of the second negative tab 113 passes through the center of the first through hole 111, and the first connection line and the second connection line are perpendicular to each other.

By adopting the above scheme, the first positive tab 122 and the second positive tab 123 are symmetrically distributed with respect to the center of the second through hole 121, and based on this, when the soft-package battery cell manufactured by the lamination structure 100 is charged under a high-rate and/or low-temperature environment, the current is further promoted to be uniformly distributed to all parts of the positive plate 120 through the first positive tab 122 and the second positive tab 123 symmetrically distributed with respect to the center of the second through hole 121; similarly, the first negative electrode tab 112 and the second negative electrode tab 113 can be symmetrically distributed with respect to the center of the first through hole 111, and based on this, when the soft pack cell manufactured by the lamination structure 100 is charged under a high-rate and/or low-temperature environment, the current can be further promoted to be uniformly distributed to all parts of the negative electrode sheet 110 through the first negative electrode tab 112 and the second negative electrode tab 113 symmetrically distributed with respect to the center of the first through hole 111; so that the uniformity of the current density distribution of each positive electrode tab 120 and each negative electrode tab 110 of the laminated structure 100 can be improved.

In addition, the first connecting line and the second connecting line are arranged perpendicularly, and the distances between the first positive tab 122 and the second positive tab 123 and between the first negative tab 112 and the second negative tab 113 can be effectively increased, so that the lap short circuit between the first positive tab 122 and the second positive tab 123 and between the first negative tab 112 and the second negative tab 113 can be further avoided, and the use performance of the lamination structure 100 can be further ensured and improved.

Referring to fig. 1, 2, and 3, in the present embodiment, the second through hole 121, the first through hole 111, and the third through hole are all rectangular holes, circular holes, hexagonal holes, or other polygonal holes with symmetrical centers.

By adopting the above scheme, the second through hole 121, the first through hole 111 and the third through hole which are regular in shape and symmetrical in center can be formed, so that the uniformity of current density distribution from the first through hole 111 to the negative electrode sheet 110 and the uniformity of current density distribution from the second through hole 121 to the positive electrode sheet 120 can be further improved.

Referring to fig. 1, fig. 2 and fig. 3, in the present embodiment, the first through hole 111 has two parallel first edges 1111, and the first negative tab 112 and the second negative tab 113 are respectively connected to the two first edges 1111; the second through hole 121 has two second edges 1211 parallel to and perpendicular to the first edge 1111, and the first positive tab 122 and the second positive tab 123 are connected to the two second edges 1211, respectively.

By adopting the above scheme, the first positive tab 122, the first negative tab 112, the second positive tab 123 and the second negative tab 113 can be relatively distributed on four sides of the rectangle respectively, and based on this, the arrangement positions of the first positive tab 122, the first negative tab 112, the second positive tab 123 and the second negative tab 113 can be effectively staggered, so that the lap short circuit between the first positive tab 122 and the second positive tab 123 and between the first negative tab 112 and the second negative tab 113 can be further avoided, and the use performance of the lamination structure 100 can be further improved.

Referring to fig. 1, fig. 2, and fig. 3, in the present embodiment, the first negative electrode tab 112 and the second negative electrode tab 113 are respectively disposed in the middle of the two first edges 1111; the first positive tab 122 and the second positive tab 123 are respectively disposed in the middle of the two second edges 1211.

By adopting the above scheme, on the basis of avoiding the lap short circuit between the first positive tab 122 and the second positive tab 123 and between the first negative tab 112 and the second negative tab 113, the first negative tab 112 and the second negative tab 113 are arranged in the middle, and the first positive tab 122 and the second positive tab 123 are arranged in the middle, so that when the soft package battery cell manufactured by the lamination structure 100 is charged under a high-rate and/or low-temperature environment, the current is further promoted to be uniformly distributed to all places of the negative tab 110 through the first negative tab 112 and the second negative tab 113 which are arranged in the middle, and the current is further promoted to be uniformly distributed to all places of the positive tab 120 through the first positive tab 122 and the second positive tab 123 which are arranged in the middle, so that the current density distribution uniformity of each positive tab 120 and each negative tab 110 of the lamination structure 100 can be improved.

Referring to fig. 1, 2, and 3, in the present embodiment, a cross-sectional dimension of the first through hole 111 is smaller than a cross-sectional dimension of the second through hole 121, and a cross-sectional dimension of the third through hole is smaller than the cross-sectional dimension of the first through hole 111. Wherein the cross-sections are all perpendicular to the thickness direction of the lamination stack 100.

Illustratively, the cross-sectional dimension of the first through-hole 111 may be retracted by about 1mm relative to the cross-sectional dimension of the second through-hole 121, and the cross-sectional dimension of the third through-hole may be retracted by about 1mm relative to the cross-sectional dimension of the first through-hole 111.

By adopting the above scheme, the negative electrode plate 110 can be ensured to basically cover the positive electrode plate 120, and based on this, the negative electrode plate 110 can be ensured to basically receive the lithium ions provided by the positive electrode plate 120 without omission, so that the service performance of the lamination structure 100 can be ensured; and the separator can be ensured to basically cover the negative plate 110, and based on this, the separation effect of the separator on electrons between the positive plate 120 and the negative plate 110 can be ensured, so that the service performance of the laminated structure 100 can be further ensured.

Referring to fig. 1, 2 and 3, in the present embodiment, the plate surface size of the negative electrode sheet 110 is larger than the plate surface size of the positive electrode sheet 120, and the plate surface size of the separator sheet is larger than the plate surface size of the negative electrode sheet 110. For example, the outer peripheral dimension of the negative electrode sheet 110 is expanded by about 1mm from the outer peripheral dimension of the positive electrode sheet 120, and the outer peripheral dimension of the separator sheet is expanded by about 1mm from the outer peripheral dimension of the negative electrode sheet 110.

By adopting the above scheme and combining the arrangement of the previous embodiment, when each negative plate 110, each positive plate 120 and each diaphragm of the lamination structure 100 are aligned in the thickness direction, it can be ensured that the negative plate 110 can completely cover the positive plate 120, and the diaphragm can completely cover the negative plate 110, based on which, it can be basically ensured that the negative plate 110 can receive lithium ions provided by the positive plate 120 without omission, and the diaphragm can form a reliable isolation effect on electrons between the positive plate 120 and the negative plate 110, thereby further ensuring the use performance of the lamination structure 100.

Referring to fig. 1, fig. 2, and fig. 3, an embodiment of the present invention further provides a flexible package battery cell, which includes a lamination structure 100.

It should be noted that the laminated structure 100 may be subjected to welding, packaging, baking, filling, aging, formation, final sealing, capacity grading, aging, and the like to obtain a flexible package battery cell.

Therefore, by adopting the scheme, the risk of problems of lithium precipitation, low capacity, low power density, serious heat generation, poor circulation and the like of the soft package battery cell can be reduced, and particularly, the soft package battery cell is suitable for quick charging and has long cycle life.

In this respect, in this embodiment, the soft package battery cell provided in this embodiment is compared with a conventional soft package battery cell, and specifically, the capacity retention rate of the soft package battery cell and the conventional soft package battery cell in a fast charging capacity (charging time from 0% of SOC (state of charge) to 80% of SOC), 1/3C (charge-discharge rate) charge-discharge cycle at room temperature for 1000 weeks, and an increase condition (voltage range of 2.5 to 4.2V) of DCR (direct Current resistance), are counted, and the comparison results are summarized as follows:

from the data of last table, for traditional soft-packaged electric core, the soft-packaged electric core that this embodiment provided all is obviously superior to traditional soft-packaged electric core in aspects such as ability, circulation conservation rate, DCR growth rate of filling soon. Therefore, the soft-packaged battery cell provided by the embodiment is suitable for quick charging and has a long cycle life.

Referring to fig. 1, fig. 2, and fig. 3, in the present embodiment, the soft package battery cell further includes a first negative conductive handle (not shown), a second negative conductive handle (not shown), a first positive conductive handle (not shown), and a second positive conductive handle (not shown), wherein each first negative tab 112 is bent along a first direction and welded to the first negative conductive handle, each second negative tab 113 is bent along the first direction and welded to the second negative conductive handle, and the second negative conductive handle is further welded to the first negative conductive handle; each first positive tab 122 is bent along the second direction and welded to the first positive conductive handle, each second positive tab 123 is bent along the second direction and welded to the second positive conductive handle, and the second positive conductive handle is also welded to the first positive conductive handle; wherein the second direction is opposite to the first direction.

It should be noted that, each of the first negative electrode tabs 112 aligned in the thickness direction may be bent along the first direction, welded to each other, and externally connected to the first negative conductive handle; similarly, the second negative electrode tabs 113 aligned in the thickness direction may be bent along the first direction, welded to each other, and externally connected to the second negative conductive handle; finally, the first negative conductive handle and the second negative conductive handle can be welded together to form the negative electrode of the soft-packaged cell.

Similarly, each first positive tab 122 aligned in the thickness direction may be bent along the second direction, welded together, and externally connected to the first positive conductive handle; similarly, each second positive tab 123 aligned in the thickness direction may be bent along the second direction, welded together, and externally connected to a second positive conductive handle; finally, the first positive conductive handle and the second positive conductive handle may be welded together to form the positive electrode of the soft-packed cell. And the positive electrode and the negative electrode of the formed soft package battery cell are oppositely positioned on two sides of the soft package battery cell.

Therefore, by adopting the above scheme, can form the negative pole and the positive pole of soft-packaged battery cell respectively in the relative both sides of the thickness direction of soft-packaged battery cell, wherein, the negative pole of soft-packaged battery cell is buckled and is welded in first negative conductive handle by each first negative pole ear 112, each second negative pole ear 113 is buckled and is welded in second negative conductive handle, and first negative conductive handle and the welding of second negative conductive handle form, the positive pole of soft-packaged battery cell is buckled and is welded in first positive conductive handle by each first positive pole ear 122, each second positive pole ear 123 is buckled and is welded in the second positive conductive handle, and first positive conductive handle and the welding of second positive conductive handle form, on the basis of this, can improve the performance of soft-packaged battery cell on the basis of guaranteeing current density distribution homogeneity.

Referring to fig. 1, fig. 2, and fig. 3, in the present embodiment, the flexible package battery cell further includes an insulating glue (not shown in the drawings), and the insulating glue is connected to the bent first negative tab 112 and the bent second negative tab 113, or connected to the bent first positive tab 122 and the bent second positive tab 123, so as to prevent a short circuit.

It should be noted that the bent first negative electrode tab 112 and the bent second negative electrode tab 113 may have a short-circuit risk with the first positive electrode tab 122 and the second positive electrode tab 123, and thus, where the short-circuit may occur, the short-circuit may be prevented by coating an insulating adhesive.

Therefore, by adopting the scheme, the contact short circuit can be effectively prevented through the insulating glue, so that the service performance and the safety performance of the soft package battery cell can be further improved.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.

Claims (10)

1. A lamination stack, comprising:

the negative pole pieces are stacked along the thickness direction of the negative pole pieces, a first through hole is formed in the middle of each negative pole piece, a first negative pole lug and a second negative pole lug which are oppositely arranged are connected to the edge of the first through hole, the first negative pole lug of each negative pole piece is stacked along the thickness direction of the negative pole piece, and the second negative pole lug of each negative pole piece is stacked along the thickness direction of the negative pole piece;

the positive plate is inserted between two adjacent negative plates, a second through hole which is aligned with the first through hole is formed in the middle of the positive plate, a first positive tab and a second positive tab which are oppositely arranged are connected to the edge of the second through hole, the first positive tab of each positive plate is arranged in a stacking mode in the thickness direction of the first positive tab, the second positive tab of each positive plate is arranged in a stacking mode in the thickness direction of the second positive tab, and the first positive tab and the second positive tab are staggered with the first negative tab and the second negative tab in the thickness direction;

and the plurality of diaphragm sheets are separated between the adjacent negative pole sheets and the positive pole sheets, and the middle parts of the diaphragm sheets are provided with third through holes which are aligned with the first through holes and the second through holes.

2. The lamination stack according to claim 1, wherein a first connection line between the geometric center of the first positive tab and the geometric center of the second positive tab passes through the center of the second through hole, a second connection line between the geometric center of the first negative tab and the geometric center of the second negative tab passes through the center of the first through hole, and the first connection line is disposed perpendicular to the second connection line.

3. A lamination according to claim 1, wherein the second through-hole, the first through-hole and the third through-hole are all rectangular holes or circular holes or hexagonal holes or other centrally symmetric polygonal holes.

4. The lamination stack according to claim 3, wherein the first through hole has two parallel first edges, and the first negative tab and the second negative tab are connected to the two first edges, respectively;

the second through hole is provided with two second edges which are parallel and perpendicular to the first edge, and the first positive lug and the second positive lug are respectively connected to the two second edges.

5. The lamination stack according to claim 4, wherein the first negative electrode tab and the second negative electrode tab are respectively disposed at a middle portion of the first edges; the first positive lug and the second positive lug are respectively arranged in the middle of the two second edges.

6. The lamination structure according to any one of claims 1-5, wherein a cross-sectional dimension of the first through-hole is smaller than a cross-sectional dimension of the second through-hole, and a cross-sectional dimension of the third through-hole is smaller than a cross-sectional dimension of the first through-hole.

7. The lamination stack according to claim 6, wherein the plate surface size of the negative electrode sheet is larger than the plate surface size of the positive electrode sheet, and the plate surface size of the separator sheet is larger than the plate surface size of the negative electrode sheet.

8. A flexible-package cell comprising the laminate structure of any one of claims 1 to 7.

9. The flexible packaging cell of claim 8, further comprising a first negative conductive handle, a second negative conductive handle, a first positive conductive handle, and a second positive conductive handle, wherein each of the first negative tabs is bent in a first direction and welded to the first negative conductive handle, each of the second negative tabs is bent in the first direction and welded to the second negative conductive handle, and the second negative conductive handle is further welded to the first negative conductive handle; each first positive lug is bent along a second direction and welded to the first positive conductive handle, each second positive lug is bent along the second direction and welded to the second positive conductive handle, and the second positive conductive handle is further welded to the first positive conductive handle; wherein the second direction is opposite to the first direction.

10. The flexible package cell of claim 9, further comprising an insulating glue, wherein the insulating glue is connected to the bent first negative tab and the bent second negative tab or the bent first positive tab and the bent second positive tab to prevent contact shorts.

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