CN212571262U

CN212571262U - Laminated battery core and soft package battery

Info

Publication number: CN212571262U
Application number: CN202021450910.7U
Authority: CN
Inventors: 林真龙; 洪丽
Original assignee: Shanghai Cenat New Energy Co Ltd
Current assignee: Shanghai Cenat New Energy Co Ltd
Priority date: 2020-07-21
Filing date: 2020-07-21
Publication date: 2021-02-19
Anticipated expiration: 2030-07-21

Abstract

The utility model provides a laminated cell and a soft package battery; the laminated battery cell comprises a plurality of layers of pole pieces and a plurality of layers of diaphragms which are alternately laminated; the pole piece includes the body and locates the ear on the body, but the ear is including the dull and stereotyped section that is used for being connected with utmost point ear and the preliminary treatment section of elastic bending, and the dull and stereotyped section links to each other with the preliminary treatment section, and the preliminary treatment section links to each other with the body. By adopting the above scheme, when each ear is connected with the tab, the bending of the pretreatment section can be used for avoiding the pulling body of the ear, so that the deformation of the connection part of the ear and the body can be avoided, the contraction of the diaphragm can be avoided, and the potential safety hazard can be reduced.

Description

Laminated battery core and soft package battery

Technical Field

The utility model belongs to the technical field of the battery, more specifically say, relate to a range upon range of formula electricity core and laminate polymer battery.

Background

The naked electric core of the lithium ion battery has a laminated structure and a winding structure, the laminated structure is that the positive plate, the diaphragm and the negative plate are alternatively superposed together or the negative plate, the diaphragm and the positive plate are alternatively superposed together to prepare the electric core, and then the electric core is arranged in the battery shell to prepare the battery. Since the battery with the stacked structure can be suitable for the production of batteries with various types and capacities, the battery with the stacked structure is widely applied to the technical field of lithium ion batteries. The laminated lithium ion battery is generally formed by alternately laminating N (N is a positive integer) positive plates and N +1 negative plates, and adjacent positive plates and negative plates are separated by a diaphragm. Although the positive and negative electrode sheets and the separator are relatively thin, a battery usually requires tens of positive and negative electrode sheets and separators to be alternately stacked to form a battery core with a certain thickness, and then the electrode sheet ears are welded with metal conductive handles (commonly called as tabs) of the battery so as to be electrically connected with an external device. Just because electric core after the lamination possesses certain thickness, when pole piece ear and electrically conductive handle welding, owing to receive the great pressure of welding jig, range upon range of pole piece ear can be to the intermediate level extrusion, this can make the ear tensile of pole piece and the junction of pole piece body, and make pole piece ear and this body junction of pole piece also receive the tensile force, and lead to the junction of pole piece ear and pole piece body to warp, may lead to the diaphragm shrink even, and cause electric core self discharge's potential safety hazard.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a range upon range of formula electricity core to when the pole piece ear and the utmost point ear of the range upon range of formula electricity core that exist among the solution correlation technique are connected, can make the junction of pole piece ear and pole piece body warp, may lead to the diaphragm shrink even, and cause the problem of electric core self discharge's potential safety hazard.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions: providing a laminated cell, which comprises a plurality of layers of pole pieces and a plurality of layers of diaphragms which are alternately laminated; the pole piece includes the body and locates the ear on the body, and the ear includes the dull and stereotyped section of being connected with utmost point ear and the preliminary treatment section that can elastically bend, and the dull and stereotyped section links to each other with the preliminary treatment section, and the preliminary treatment section links to each other with the body.

By adopting the above scheme, when ear and utmost point ear are connected, can avoid ear's pulling body through the bending of preliminary treatment section, and then can avoid ear and this body junction to warp to avoid the diaphragm shrink, reduce the potential safety hazard.

In an alternative embodiment, the pre-treatment section is curved in an arc-shaped configuration.

By adopting the scheme, when the lug parts of the pole pieces are extruded towards the direction of the pole pieces in the middle layer, the body of the pole pieces can be prevented from being stretched because the pretreatment section is bent into an arc shape; and the pretreatment section is arranged to be arc-shaped, so that the processing and the manufacturing are convenient.

In an alternative embodiment, the lengths of the pretreatment sections corresponding to the ear portions located in the middle layer to the ear portions located in the edge layer are sequentially increased.

Through adopting above-mentioned scheme, when being connected the ear and the utmost point ear of pole piece, the ear that is close to the edge more warp more, increases the length of each preliminary treatment section in proper order, can make things convenient for the ear and the utmost point ear of each pole piece to be connected to reduce the preliminary treatment section and follow each department's deformation range on the length direction, in order to make things convenient for processing and manufacturing.

In an alternative embodiment, in the ear portions of two adjacent layers on the ear side of the middle layer: the length of the ear part close to the edge layer is equal to the sum of the length of the ear part close to the middle layer and the distance between the bodies of the two layers of ear parts corresponding to the pole pieces.

Through adopting above-mentioned scheme, the one end that the body was kept away from to a plurality of ears that messenger that can be good was overlapped aligns to conveniently be connected with utmost point ear.

In an alternative embodiment, of the stacked plurality of pole pieces: the pretreatment section of the pole piece positioned in the middle layer is flat.

By adopting the scheme, the pole piece positioned in the middle layer can be conveniently processed and manufactured, and the pole piece positioned in the middle layer can be used as a reference so as to process other pole pieces.

In an alternative embodiment, the pre-treatment section is curved with the middle portion in a direction toward the ear portion of the intermediate layer; or the middle part of the pretreatment section is bent towards the ear part which is away from the middle layer.

By adopting the scheme, the plurality of stacked ear parts are symmetrically arranged by taking the pole piece in the middle layer as a reference, and the ear parts on two sides can be conveniently connected with the pole lugs.

In an alternative embodiment, the pretreatment section is disposed in a wave shape.

Through adopting above-mentioned scheme, can make things convenient for the deformation of preliminary treatment section, and then when being connected ear and utmost point ear, can avoid tensile pole piece's body.

In an alternative embodiment, in the thickness direction of the ear: the end of the stacked plurality of ears remote from the body is aligned.

By adopting the scheme, the connection of each ear part and the lug can be facilitated.

In an alternative embodiment, each ear further comprises a flat section connecting the body and the pretreatment section.

By adopting the scheme, the good transition connection between each ear part and the body can be ensured, and the body of the pole piece can be prevented from being damaged when the pretreatment section is manufactured.

Another object of the embodiment of the utility model is to provide a laminate battery, including the range upon range of formula electric core as above any embodiment.

The utility model discloses laminate polymer battery has adopted above-mentioned range upon range of formula electricity core, can avoid ear and this body coupling department to warp to avoid the diaphragm shrink, the security is high.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or exemplary technical descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a stacked electrical core according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a pole piece according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a pole piece according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a pole piece provided by the third embodiment of the present invention.

Fig. 5 is the utility model provides a laminate polymer battery's schematic structure diagram.

Wherein, in the drawings, the reference numerals are mainly as follows:

100-soft package battery;

10-a stacked cell; 11-a separator; 12-pole piece; 121-negative plate; 122-positive plate; 13-a body; 14-ear; 141-a flat plate section; 142-a pre-treatment section; 143-a leveling section;

21-pole ear.

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.

In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Reference throughout the specification to "one embodiment," "some embodiments," or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the invention. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The first embodiment is as follows:

referring to fig. 1 and fig. 2, a stacked cell 10 according to an embodiment of the present invention will now be described. The laminated battery core 10 comprises a plurality of layers of pole pieces 12 and a plurality of layers of diaphragms 11, wherein the plurality of layers of pole pieces 12 and the plurality of layers of diaphragms 11 are alternately laminated. The multilayer pole piece 12 is divided into a positive pole piece 122 and a negative pole piece 121, the positive pole piece 122 and the negative pole piece 121 are alternately arranged, and the two sides of each diaphragm 11 are the positive pole piece 122 and the negative pole piece 121 respectively. The pole pieces 12 comprise a body 13 and lug parts 14 arranged on the body 13, the lug parts 14 are used for being connected with the pole lugs, the lamination arrangement of the multiple layers of pole pieces 12 means that the body 13 of the multiple pole pieces 12 is lamination arrangement, the lug parts of the positive pole pieces 122 are lamination arrangement, the lug parts of the negative pole pieces 121 are lamination arrangement, and the lug parts of the positive pole pieces 122 and the lug parts of the negative pole pieces 121 are staggered mutually, so that the lug part of each positive pole piece 122 is connected with one pole lug to form the positive pole of the battery; the ear portion of each negative electrode tab 121 is connected to another tab to form a negative electrode of the battery.

In general, the lug portions of the positive electrode sheet 122 and the negative electrode sheet 121 are offset from each other, and therefore, in the present invention, the lug portions to be stacked may be lug portions to which the positive electrode sheets 122 are stacked or lug portions to which the negative electrode sheets 121 are stacked. In the following, several directions will be defined based on the above-mentioned "ear", for example: from the ear portion located in the intermediate layer to the ear portion located in the edge layer, which may be the ear portion where the positive electrode sheets 122 are laminated; the tab portions located in the middle layer may extend to the edge layer tab portions located on both sides, or the tab portions located in the middle layer may extend to the edge layer tab portions located on both sides, among the tab portions of the negative electrode sheet 121 stacked. The laminated pole pieces 12 include a plurality of negative pole pieces 121 and a plurality of positive pole pieces 122 alternately arranged.

The ear part 14 comprises a flat plate section 141 and a pretreatment section 142, the flat plate section 141 is connected with the pretreatment section 142, and the pretreatment section 142 is connected with the body 13; the flat plate sections 141 are used for being connected with the tabs, the preprocessing section 142 can be elastically bent, when each flat plate section 141 is connected with the tabs, each ear 14 is extruded towards the middle, when each flat plate section 141 moves towards the middle, the corresponding preprocessing section 142 can adapt to the deformation, the tensile deformation of the joint of the ear 14 of the pole piece 12 and the body 13 can be avoided, and then the diaphragm can be prevented from shrinking, so that the self-discharge of the battery cell due to the diaphragm shrinkage is prevented, the potential safety hazard is reduced, and the safety of the laminated battery cell 10 is improved.

The utility model provides a range upon range of formula electricity core 10 compares with prior art, when each ear 14 is connected with utmost point ear, can be through the bending of preliminary treatment section 142, and avoid ear 14 to stimulate corresponding body 13, and then can avoid ear 14 to warp with corresponding body 13 junction to avoid diaphragm 11 shrink, reduce the potential safety hazard.

In one embodiment, referring to fig. 2, the pre-treatment section 142 is curved to form an arc shape, which facilitates the manufacturing process; and when the ear 14 of the pole piece 12 is extruded towards the middle layer pole piece 12, the body 13 of the pole piece 12 can be prevented from being stretched because the preprocessing section 14 is bent into an arc shape, and further the deformation of the joint of the ear 14 and the corresponding body 13 can be prevented.

Of course, in some embodiments, bending the pre-treatment section 142 into an arc shape may bring the flat section 141 of each ear 14 closer to the middle layer pole piece 12 to facilitate connection with the tab; and the preprocessing section 142 can also function as a positioning function.

In one embodiment, referring to fig. 1 and 2, from the ear at the middle layer to the ear at the edge layer: the length of each pretreatment segment 142 is sequentially increased; that is, the lengths of the pretreatment sections 142 corresponding to the ear portions located in the middle layer to the ear portions located in the edge layer are sequentially increased. When the ear part of the pole piece 12 is connected with the pole lug, the deformation of the ear part closer to the edge is larger, the length of each pretreatment section 142 is sequentially increased, the flat plate section 141 close to the edge ear part can be close to the position of the middle layer pole piece 12, and the position consistency of one end of each adjacent flat plate section 141 far away from the corresponding body 13 is good, so that the ear part of each pole piece 12 is conveniently connected with the pole lug; in addition, the structure can also reduce the deformation amplitude of the pretreatment section 142 along the length direction, so as to facilitate processing and manufacturing.

In one embodiment, referring to fig. 1 and 2, from the ear portion located in the middle layer to the ear portion located in the edge layer, two adjacent ear portions: the length of the ear near the edge is equal to the sum of the length of the ear near the middle and the distance between the two ears corresponding to the body 13 of the pole piece 12. That is, from the ear part located in the middle layer to the adjacent two ear parts located in the ear part on one side, the two ear parts are respectively the ear part close to the middle layer and the ear part close to the edge, and the pole pieces 12 corresponding to the two ear parts are both the positive pole piece 122 or both the negative pole pieces 121; the distance between the bodies 13 of the two pole pieces 12 corresponding to the two ears is the sum of the thickness of the two diaphragms 11 and the thickness of one pole piece with opposite polarity between the two pole pieces 12. Taking the corresponding ear portions of the two negative electrode tabs 121 as examples: a positive plate 122 and two separators 11 are arranged between the two negative plates 121, the distance between the two negative plates 121 is the sum of the thickness of the two separators 11 and the thickness of the positive plate 122, and the length of the ear part corresponding to the negative plate 121 close to the edge is equal to the sum of the length of the ear part close to the middle negative plate 121, the thickness of the two separators 11 and the thickness of one positive plate 122. Similarly, taking the corresponding ear portions of the two positive plates 122 as an example: a negative electrode plate 121 and two separators 11 are arranged between the two positive electrode plates 122, the distance between the two positive electrode plates 122 is the sum of the thickness of the two separators 11 and the thickness of the negative electrode plate 121, the length of the ear part corresponding to the positive electrode plate 122 close to the edge is equal to the sum of the length of the ear part close to the middle positive electrode plate 122 and the thickness of the two separators 11 and the thickness of one negative electrode plate 121, and here, the length of the ear part 14 is the sum of the length of the flat plate section 141 after the pretreatment section 142 is flattened. This structure can guarantee that each ear is kept away from the one end of corresponding body 13 and is the alignment setting when each ear extrudes to the intermediate level and removes to be connected with utmost point ear.

In one embodiment, referring to fig. 1 and 2, the stacked plurality of pole pieces 12 refers to a plurality of positive pole pieces 122 and a plurality of negative pole pieces 121 which are alternately stacked. Among the laminated plurality of pole pieces 12: the pretreatment section 142 of the pole piece 12 positioned in the middle layer is in a flat plate shape, the ear part of the pole piece 12 positioned in the middle layer can be not pretreated, the processing and the manufacturing can be facilitated, and the pole piece 12 positioned in the middle layer can be used as a reference so as to process other pole pieces.

In one embodiment, the length of the ear of two pole pieces 12 adjacent to the middle layer pole piece 12 is equal to the sum of the length of the ear of the middle layer pole piece 12 and the thickness of one diaphragm 11; the two pole pieces 12 adjacent to the middle pole piece 12 refer to two pole pieces which are located on two sides of the middle pole piece 12 and are closest to the middle pole piece 12, and in addition, the polarity of the two pole pieces is opposite to that of the middle pole piece 12; this configuration allows the ears of the two pole pieces 12 adjacent to the middle layer pole piece 12 to be aligned away from one end of the corresponding body 13.

In one embodiment, referring to fig. 1, the pretreatment section 142 is bent toward the ear of the intermediate layer at the middle, and this structure can reduce the space occupied by the ear to increase the energy density of the fabricated laminated battery cell 10. In addition, the structure can enable the plurality of laminated ear parts to be symmetrically arranged by taking the middle layer pole piece 12 as a reference, and the ear parts at two sides can be conveniently connected with the pole lugs.

In some embodiments, the pretreatment section 142 may also be bent in a direction from the middle toward the middle layer ear, and this structure may allow the stacked multiple ears to be symmetrically disposed with reference to the middle layer pole piece 12, and may facilitate connection between the ears on both sides and the tab.

In one embodiment, referring to fig. 1, along the thickness of the ear 14: the stacked plurality of ear portions 14 are arranged in alignment with one end away from the corresponding body 13 to facilitate connection of each ear portion 14 with a corresponding tab.

Example two:

referring to fig. 1 and fig. 3, the laminated cell 10 of the present embodiment differs from the laminated cell 10 of the first embodiment in that:

in this embodiment, the pretreatment sections 142 of the ear 14 are arranged in a wave shape, that is, the pretreatment sections 142 of the ear 14 are bent in a wave shape, so that the height of the pretreatment sections 142 protruding to the corresponding pole piece 12 can be reduced, and the space occupied by each pretreatment section 142 is further reduced; and this structure can also make things convenient for the deformation of preliminary treatment section 142, and then when being connected ear 14 with utmost point ear, can avoid tensile pole piece 12's body 13 to avoid ear 14 and corresponding body 13 junction to warp, in order to avoid diaphragm 11 shrink, reduce the potential safety hazard. In still other embodiments, the pre-treatment section 142 may be curved in a C-shape. In still other embodiments, the pre-treatment section 142 may be bent to directly position the plate section 141 for connection with the tab.

Other structures of the laminated battery cell 10 of the present embodiment are the same as those of the laminated battery cell 10 of the first embodiment, and are not described herein again.

Example three:

referring to fig. 1 and fig. 4, the laminated cell 10 of the present embodiment differs from the laminated cell 10 of the second embodiment in that:

in this embodiment, the ear portion 14 further includes a flat section 143, and the flat section 143 connects the body 13 and the pretreatment section 142. The leveling section 143 is provided to ensure a good transition connection between each ear 14 and the body 13, and to avoid damaging the body 13 of the pole piece 12 when the preprocessing section 142 is manufactured. In addition, when the ear portion 14 is manufactured, the ear portion 14 is manufactured into a flat plate shape, and then a section of the flat plate-shaped ear portion 14 is punched into the preprocessing section 142 with a corresponding shape, so that the ear portion can be conveniently processed and manufactured.

Other structures of the laminated battery cell 10 of the present embodiment are the same as those of the laminated battery cell 10 of the second embodiment, and are not described again here.

Referring to fig. 5, an embodiment of the present invention further provides a pouch battery 100, including the stacked electrical core 10 according to any of the above embodiments. This laminate type battery 100 has adopted above-mentioned range upon range of formula electricity core 10, can avoid ear 14 and body 13 junction to warp to avoid diaphragm 11 shrink, the security is high.

In one embodiment, referring to fig. 1 and fig. 5, the multilayer pole piece 12 of the laminated cell 10 is divided into a positive pole piece 122 and a negative pole piece 121, the positive pole piece 122 and the negative pole piece 121 are alternately arranged, and the two sides of each separator 11 are the positive pole piece 122 and the negative pole piece 121 respectively. A plurality of tab portions of the positive electrode tab 122 are stacked, a plurality of tab portions of the negative electrode tab 121 are stacked, and the tab portions of the positive electrode tab 122 and the tab portions of the negative electrode tab 121 are offset from each other, so that the tab portions of the positive electrode tabs 122 are connected to one tab 21 to form a positive electrode of the battery; the ear portion of each negative electrode tab 121 is connected to one tab 21 to form a negative electrode of the battery.

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

Claims

1. The laminated battery cell comprises a plurality of layers of pole pieces and a plurality of layers of diaphragms which are alternately laminated; the pole piece includes the body and locates ear on the body, its characterized in that, ear includes the dull and stereotyped section of being connected with utmost point ear and the preliminary treatment section of elastically bending, the dull and stereotyped section with the preliminary treatment section links to each other, the preliminary treatment section with the body links to each other.

2. The laminated cell of claim 1, wherein the preconditioning section is curved in an arcuate configuration.

3. The laminated cell of claim 2, wherein the length of the pretreatment sections corresponding to the ear portions located at the intermediate layer to the ear portions located at the edge layer increases in order.

4. The laminated cell of claim 3, wherein two adjacent layers of the ear on the ear side of an intermediate layer: the length of the ear part close to the edge layer is equal to the sum of the length of the ear part close to the middle layer and the distance between the bodies of the corresponding pole pieces of the ear part.

5. The laminated cell of claim 4, wherein, in the laminated plurality of pole pieces: the pretreatment section of the pole piece positioned in the middle layer is flat.

6. The laminated cell of claim 2, wherein the pre-treatment section is curved in a direction toward the ear of the intermediate layer at a middle portion; or the middle part of the pretreatment section is bent towards the direction of the ear part which is away from the middle layer.

7. The laminated cell of any one of claims 1 to 6, wherein the pre-treatment section is disposed in an undulating shape.

8. The laminated cell of any one of claims 1-6, wherein, in a thickness direction of the ear: the end of the ear parts far away from the body is arranged in alignment.

9. The laminated cell of any one of claims 1-6, wherein the ear further comprises a flat section, the flat section connecting the body and the pretreatment section.

10. Pouch battery, characterized in that it comprises a laminated cell according to any of claims 1 to 9.