CN218586058U - Battery core and single battery - Google Patents

Abstract

The utility model discloses an electric core, include: the negative plate is provided with a first blank area; the negative electrode tab is partially arranged in the first blank area; the first blank area and the part, located in the first blank area, of the negative electrode tab are covered by the first insulation glue layer; the positive plate is provided with a second blank area; the positive electrode lug is partially arranged in the second blank area; the second insulating glue layer covers the second blank area and the part, located in the second blank area, of the positive electrode tab; the diaphragm is arranged between the positive plate and the negative plate; and the first ceramic layer is arranged on the positive plate and covers the first insulating glue layer. The utility model discloses an electricity core has higher reliability.

Description

Battery core and single battery

Technical Field

The utility model belongs to the technical field of the battery technique and specifically relates to an electricity core and battery cell are related to.

Background

In the related art, tabs are welded on the pole pieces, and after the pole pieces are manufactured into a battery cell, current in the battery cell is led out through the tabs or is flushed into the battery cell through the tabs. Usually, tab welding back on the pole piece, can be on tab and pole piece cover the adhesive tape to prevent that lithium is appeared in the electric core, however, after covering the adhesive tape for tab and pole piece, the adhesive tape is soaked by electrolyte, drops easily and falls into in the electrolyte, thereby influences the reliability of electric core.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an electric core, it has higher reliability.

The utility model discloses still provide a battery cell who has above-mentioned electric core.

According to the utility model discloses electric core of first aspect embodiment, include: the negative plate is provided with a first blank area; a negative electrode tab partially arranged in the first blank area; the first insulation glue layer covers the first blank area and the part, located in the first blank area, of the negative pole tab; the positive plate is provided with a second blank area; the positive electrode lug is partially arranged in the second blank area; the second insulating glue layer covers the second blank area and a part of the diaphragm of the positive electrode tab in the second blank area, and is arranged between the positive electrode plate and the negative electrode plate; and the first ceramic layer is arranged on the positive plate and covers the first insulating glue layer.

According to the utility model discloses electric core has following beneficial effect at least: after covering the negative plate through first ceramic layer, can guarantee that the negative plate is difficult to take place to analyse lithium, first ceramic layer also can not drop because of being soaked the back by electrolyte simultaneously, consequently, electric core has higher reliability.

According to the utility model discloses an electricity core of some embodiments, electricity core still includes the second ceramic layer, the second ceramic layer sets up on the negative pole piece, and cover in second insulating glue layer.

According to the utility model discloses an electricity core of some embodiments, the positive pole piece is close to one side of first blank area be provided with the fourth blank area that first blank area corresponds, first ceramic layer set up in the fourth blank area, the negative pole piece is close to one side of second blank area be provided with the third blank area that the second blank area corresponds, the second ceramic layer set up in the third blank area.

According to the utility model discloses an electric core of some embodiments, electric core by the positive plate the diaphragm the negative pole piece is convoluteed and is formed.

According to the utility model discloses an electricity core of some embodiments, the width of first insulation glue film is greater than the width in first blank area, the length of first insulation glue film is greater than the length in first blank area.

According to the utility model discloses an electricity core of some embodiments, the width of first ceramic layer is greater than the width of first insulation glue film, the length of first ceramic layer is greater than the length of first insulation glue film.

According to the utility model discloses an electricity core of some embodiments, the width of second insulating glue layer is greater than the blank width of second, the length of second insulating glue layer is greater than the blank length of second.

According to the utility model discloses an electricity core of some embodiments, the width of second ceramic layer is greater than the width of second insulating glue film, the length of second ceramic layer is greater than the length of second insulating glue film.

According to the utility model discloses an electric core of some embodiments, follow the length direction of negative pole piece, first blank set up in the centre of negative pole piece, follow the length direction of positive plate, the blank set up of second in the centre of positive plate.

According to the utility model discloses a single battery of second aspect embodiment includes;

a housing provided with a storage chamber;

the electrical core of any of the embodiments of the first aspect, disposed in the storage cavity.

According to the utility model discloses cell has following beneficial effect at least: the battery cell has high reliability, so that the battery cell has high reliability.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention will be further described with reference to the following drawings and examples, in which:

fig. 1 is a schematic view of a positive electrode tab and a negative electrode tab in the related art;

fig. 2 is a schematic diagram of positive and negative plates of a cell according to some embodiments of the present invention;

fig. 3 is a schematic diagram of positive and negative plates of a cell according to some embodiments of the present invention;

fig. 4 is a schematic diagram of a cell of some embodiments of the present invention.

Reference numerals are as follows:

the battery comprises a battery cell 100, a first insulating adhesive layer 110, a second insulating adhesive layer 120, an active material 130, a positive electrode sheet 200, a second blank region 210, a fourth blank region 220, a negative electrode sheet 300, a first blank region 310, a third blank region 320, a separator 400, a first ceramic layer 500, a second ceramic layer 600, adhesive paper 700, a positive electrode tab 800 and a negative electrode tab 900.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the terms in the present invention by combining the specific contents of the technical solution.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1 and fig. 2, in some embodiments, the battery cell 100 includes: the positive plate 200, the positive tab 800, the second insulating glue layer 120, the negative plate 300, the negative tab 900, the first insulating glue layer 110, the separator 400, and the first ceramic layer 500, the positive plate 200 is provided with a second blank space 210, for example, the second blank space 210 is a groove, the second blank space 210 is free of the active material 130, the positive tab 800 is provided in the second blank space 210, and thus, the positive tab 800 can be welded at the second blank space 210, and the second insulating glue layer 120 covers the second blank space 210 and the part of the positive tab 800 located in the second blank space 210, so that the surrounding active material 130 can be prevented from dissociating on the second blank space 210 and the positive tab 800; the separator 400 is positioned between the positive electrode sheet 200 and the negative electrode sheet 300 and respectively wraps the two opposite surfaces of the positive electrode sheet 200 to separate the positive electrode sheet 200 from the negative electrode sheet 300, or the separator 400 respectively wraps the two opposite surfaces of the negative electrode sheet 300 to separate the positive electrode sheet 200 from the negative electrode sheet 300; the first ceramic layer 500 is disposed on the positive electrode tab 200 and covers the first insulating adhesive layer 110. Specifically, after the negative electrode sheet 300 is covered by the first ceramic layer 500, it can be ensured that the negative electrode sheet 300 is not easy to generate lithium deposition, and meanwhile, the first ceramic layer 500 does not fall off after being soaked by the electrolyte, so that the battery cell 100 has high reliability.

Specifically, the first insulating adhesive layer 110 may enable the negative electrode tab 900 and the first blank area 310 to have no active material 130 thereon, so that the problem of lithium deposition in the battery cell 100 may not occur, and further, in order to prevent burrs generated after cutting the negative electrode sheet 300 from penetrating through the first insulating adhesive layer 110, therefore, the first ceramic layer 500 is selected to cover the first insulating adhesive layer 110 and a portion of the separator 400, it is conceivable that the first ceramic layer 500 has better burr penetration resistance than the adhesive tape 700 in the related art, and is not easily affected by the electrolyte to fall off, and similarly, the positive electrode sheet 200 of the battery cell 100 is also the same, and further, the reliability of the battery cell 100 is better.

Further, a second ceramic layer 600 may be further provided to the second insulation glue layer 120 of the positive electrode tab 800. In some embodiments, the battery cell 100 further includes a second ceramic layer 600, and the second ceramic layer 600 is disposed on the negative electrode sheet 300 and covers the second insulating adhesive layer 120. Specifically, after the positive electrode plate 200 is covered by the second ceramic layer 600, it can be ensured that the positive electrode plate 200 is not easy to generate lithium deposition, and meanwhile, the second ceramic layer 600 does not fall off after being soaked by the electrolyte, so that the battery cell 100 has high reliability.

Further, since the second blank area 210 and the first blank area 310 do not have the active material 130, the active material can be welded to the positive electrode tab 800 and the negative electrode tab 900 as a current collector, and the current collector plays a role in transmitting current.

Still further, when manufacturing a single battery, the positions of the second ceramic layer 600 and the first ceramic layer 500 to be coated can be set before the active material 130 is coated on the current collector, and the volumes of the second ceramic layer 600 and the first ceramic layer 500 to be coated are set at the same time, in this case, the thicknesses of the second ceramic layer 600 and the first ceramic layer 500 must be larger than the thicknesses of metal burrs of the positive plate 200 and the negative plate 300 after being cut, so that lithium precipitation caused by penetration of the burrs can be prevented, and the thicknesses of the second ceramic layer 600 and the first ceramic layer 500 are smaller than the thicknesses of the positive plate 200 and the negative plate 300 after the active material 130 is coated on the positive plate 200 and the negative plate 300;

further, after the positions of the second ceramic layer 600 and the first ceramic layer 500 to be coated are set, the positions of the second ceramic layer 600 and the first ceramic layer 500 to be coated are located by debugging the running parameters of equipment or by an induction device, and then the second ceramic layer 600 and the first ceramic layer 500 can be coated and dried by a gravure coating process, a spraying process or a painting process;

after the second ceramic layer 600 and the first ceramic layer 500 are coated, the volume and the appearance of the second ceramic layer 600 and the first ceramic layer 500 can be confirmed through a full inspection and a sampling inspection, and a detection instrument can perform detection through an optical detection device, weighing and the like;

after the second ceramic layer 600 and the first ceramic layer 500 are coated, the active material 130 coating may be performed on the positive electrode sheet 200 and the negative electrode sheet 300, respectively, the active material 130 coating may be performed in a gravure coating manner, and the active material 130 coating avoids the areas of the second ceramic layer 600 and the first ceramic layer 500, so as to reserve the second ceramic layer 600 and the first ceramic layer 500; alternatively, the active material 130 is coated without reservation, so that the active material 130 covers the second ceramic layer 600 and the first ceramic layer 500, the surface active material 130 of the second ceramic layer 600 and the first ceramic layer 500 is removed after coating, the second ceramic layer 600 and the first ceramic layer 500 are reserved for protecting the positive plate 200 and the negative plate 300, and the active material 130 on the surfaces of the second ceramic layer 600 and the first ceramic layer 500 can be removed by laser cleaning or scraping. So, cover the back through second ceramic layer 600 and first ceramic layer 500 positive plate 200, negative pole piece 300, can guarantee that positive plate 200, negative pole piece 300 are difficult to take place to analyse the lithium, and second ceramic layer 600 and first ceramic layer 500 also can not drop because of being soaked by electrolyte after simultaneously, consequently, electric core 100 has higher reliability.

Referring to fig. 2 and 3, in some embodiments, a fourth blank area 220 corresponding to the first blank area 310 is disposed on a side of the positive electrode sheet 200 close to the first blank area 310, a first ceramic layer 500 is disposed in the fourth blank area 220, a third blank area 320 corresponding to the second blank area 210 is disposed on a side of the negative electrode sheet 300 close to the second blank area 210, and a second ceramic layer 600 is disposed in the third blank area 320. Specifically, after the positive electrode sheet 200, the negative electrode sheet 300 and the separator 400 are wound, the positive electrode sheet 200, the separator 400 and the negative electrode sheet 300 are sequentially arranged, that is, the separator 400 is arranged after the positive electrode sheet 200, the negative electrode sheet 300 is arranged after the separator 400, the separator 400 is arranged after the negative electrode sheet 300, and the positive electrode sheet 200 is arranged after the separator 400, so that after the third blank area 320 corresponds to the second blank area 210, the second ceramic layer 600 may be arranged in the third blank area 320 to cover the second insulating adhesive layer 120, so as to protect the positive electrode tab 800. Meanwhile, since the second ceramic layer 600 is disposed in the third blank area 320, compared with the case that the adhesive tape 700 is attached to the negative electrode sheet 300 in the related art, the adhesive tape 700 has a certain thickness, so that the thickness of the negative electrode sheet 300 is indirectly increased on the negative electrode sheet 300 when the adhesive tape 700 is attached, so that the length of the negative electrode sheet 300 that can be wound is reduced when winding is performed, it is conceivable that the adhesive tape 700 is also applied to the positive electrode sheet 200, so that the energy density of the battery cell 100 is reduced, and after the second ceramic layer 600 is disposed in the third blank area 320, the thickness of the adhesive tape 700 is reduced, so that the positive electrode sheet 200 and the negative electrode sheet 300 can be wound for more turns, and the energy density of the battery cell 100 is improved. The same applies to the negative electrode tab 900.

Referring to fig. 3 and 4, in some embodiments, the battery cell 100 is formed by winding a positive electrode sheet 200, a separator 400, and a negative electrode sheet 300. Specifically, the battery cell 100 of the winding structure formed by winding has low processing cost, and high efficiency and high quality can be easily achieved no matter manual, semi-automatic or full-automatic winding is performed.

In some embodiments, the battery cell 100 is formed by sequentially stacking the positive electrode sheet 200, the separator 400, and the negative electrode sheet 300. Specifically, the battery core 100 formed by lamination has better charge and discharge power, higher utilization rate of the lamination structure, larger area of the loaded pole piece and higher energy density.

Referring to fig. 2 and 3, in some embodiments, the width of the first insulation adhesive layer 110 is greater than the width of the first blank area 310, and the length of the first insulation adhesive layer 110 is greater than the length of the first blank area 310. Specifically, the first adhesive layer 110 may completely cover the first blank region 310 and the anode tab 900 in the first blank region 310, so as to ensure that the anode tab is not affected by the active material 130, and prevent the lithium precipitation problem.

Referring to fig. 2 and 3, in some embodiments, the width of the first ceramic layer 500 is greater than the width of the first adhesive layer 110, and the length of the first ceramic layer 500 is greater than the length of the first adhesive layer 110. Specifically, the first ceramic layer 500 may completely cover the first adhesive layer 110 to further protect the first blank region 310 and the negative electrode tab 900 in the first blank region 310 from the active material 130 on the basis of the first adhesive layer 110, thereby preventing the problem of lithium precipitation, and thus, the reliability of the battery cell 100 is high.

Referring to fig. 2 and 3, in some embodiments, the width of the second insulating adhesive layer 120 is greater than the width of the second blank region 210, and the length of the second insulating adhesive layer 120 is greater than the length of the second blank region 210. Specifically, the second insulation glue layer 120 may completely cover the second blank area 210 and the positive electrode tab 800 in the second blank area 210, so as to ensure that the positive electrode tab is not affected by the active material 130, and prevent the lithium deposition problem.

Referring to fig. 2 and 3, in some embodiments, the width of the second ceramic layer 600 is greater than the width of the second adhesive layer 120, and the length of the second ceramic layer 600 is greater than the length of the second adhesive layer 120. Specifically, the second ceramic layer 600 may completely cover the second adhesive layer 120 to further protect the second blank region 210 and the positive electrode tab 800 in the second blank region 210 from the active material 130 on the basis of the second adhesive layer 120, so as to prevent the problem of lithium precipitation, and thus, the reliability of the single battery is high.

Referring to fig. 4, in some embodiments, along the length direction of the negative electrode sheet 300, the first blank region 310 is disposed in the middle of the negative electrode sheet 300, and along the length direction of the positive electrode sheet 200, the second blank region 210 is disposed in the middle of the positive electrode sheet 200. Specifically, since the second blank region 210 and the first blank region 310 are respectively located at the intermediate positions of the positive electrode tab 200 and the negative electrode tab 300, when the battery cell 100 is charged, a current flows from the positive electrode tab 800 and the negative electrode tab 900 to flow to both ends of the positive electrode tab 200 and the negative electrode tab 300, and further, the charging speed set at the intermediate position is faster than the case where the positive electrode tab 800 and the negative electrode tab 900 are respectively disposed at one ends of the positive electrode tab 200 and the negative electrode tab 300.

In some embodiments, a cell, comprising: a housing and the battery cell 100 of any of the above embodiments, the housing being provided with a storage cavity; the battery cells 100 are disposed in the storage cavity. Specifically, since the reliability of the battery cell 100 of the unit battery is high, the unit battery has high reliability.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. Electric core, its characterized in that includes:

the negative plate is provided with a first blank area;

a negative electrode tab partially arranged in the first blank area;

the first insulation glue layer covers the first blank area and the part, located in the first blank area, of the negative pole tab;

the positive plate is provided with a second blank area;

the positive electrode lug is partially arranged in the second blank area;

the second insulating glue layer covers the second blank area and the part, located in the second blank area, of the positive electrode tab;

a separator disposed between the positive electrode sheet and the negative electrode sheet;

and the first ceramic layer is arranged on the positive plate and covers the first insulating glue layer.

2. The battery cell of claim 1, further comprising a second ceramic layer disposed on the negative electrode sheet and covering the second insulating glue layer.

3. The battery cell of claim 2, wherein a fourth blank area corresponding to the first blank area is disposed on one side of the positive electrode sheet close to the first blank area, the first ceramic layer is disposed in the fourth blank area, a third blank area corresponding to the second blank area is disposed on one side of the negative electrode sheet close to the second blank area, and the second ceramic layer is disposed in the third blank area.

4. The battery cell of claim 1, wherein the battery cell is formed by winding the positive electrode sheet, the separator and the negative electrode sheet.

5. The battery cell of claim 1, wherein the width of the first layer of insulating glue is greater than the width of the first blank area, and the length of the first layer of insulating glue is greater than the length of the first blank area.

6. The cell of claim 5, wherein the width of the first ceramic layer is greater than the width of the first layer of adhesive insulation, and the length of the first ceramic layer is greater than the length of the first layer of adhesive insulation.

7. The battery core according to claim 2, wherein the width of the second insulating glue layer is greater than the width of the second blank area, and the length of the second insulating glue layer is greater than the length of the second blank area.

8. The electrical core of claim 7, wherein the width of the second ceramic layer is greater than the width of the second layer of insulation paste, and the length of the second ceramic layer is greater than the length of the second layer of insulation paste.

9. The electric core according to claim 1, wherein the first blank region is disposed in the middle of the negative electrode sheet along the length direction of the negative electrode sheet, and the second blank region is disposed in the middle of the positive electrode sheet along the length direction of the positive electrode sheet.

10. A battery cell, comprising:

a housing provided with a storage chamber;

the electrical core of any of claims 1-9, disposed within the storage cavity.

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