CN219610526U - Winding type lithium battery cell - Google Patents

Abstract

The utility model discloses a winding type lithium battery cell, which comprises a shell, wherein one end of the shell is clamped with an end cover piece, an insert is integrally formed in the shell, a core body inserted in the shell is sleeved outside the insert, the core body comprises a positive plate, a negative plate and a separation film, the positive plate, the negative plate and the separation film are wound together, the separation film is positioned between the positive plate and the negative plate, grooves distributed in an equidistant structure are formed on the outer walls of two sides of the shell, and a plurality of line grooves distributed in an equidistant structure are formed on the outer walls of one side of the positive plate and the outer wall of one side of the negative plate. The design of the line grooves can increase the areas of the positive plate and the negative plate under the same isolating film, so that the energy density of the battery core formed by the positive plate, the negative plate and the isolating film is increased, and the requirement of the existing product can be met without changing the size of the battery.

Description

Winding type lithium battery cell

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a winding type lithium battery cell.

Background

Lithium batteries are batteries containing lithium (including metallic lithium, lithium alloys, lithium ions and lithium polymers) in electrochemical systems, and the electrode cores of lithium batteries mainly comprise two main modes of lamination type and winding type.

The novel winding type lithium battery cell with the application number of CN201921668890.8 and the authorized bulletin date of 20200421 comprises a core body, wherein the core body consists of a shell and a cell body, the cell body is arranged inside the shell, extension bending spaces are arranged on the side walls of the shell, which are parallel to each other, the extension bending spaces consist of bending protrusions, the bending protrusions are provided with a plurality of groups, the bending protrusions are connected with each other, the bending protrusions are arranged on the same plane side by side, the extension bending spaces on the shell are symmetrical with each other, the bending protrusions are arranged on the shell of the core body, and the plurality of groups of bending protrusions are connected in parallel to form the extension bending spaces.

The winding type lithium battery cell is generally formed by winding a positive plate, a separation film and a cathode plate, but the sizes of the positive plate and the cathode plate are generally smaller than or equal to the separation film, so that in order to increase the energy density in the battery cell, a larger separation film is needed, the volume of the lithium battery cell is increased, and the requirement of the existing product cannot be met, therefore, the design of the winding type lithium battery cell is needed to solve the problems.

Disclosure of Invention

The utility model aims to provide a winding type lithium battery cell to solve the defects in the prior art.

In order to achieve the above object, the present utility model provides the following technical solutions:

the utility model provides a coiling formula lithium cell electricity core, includes the casing, casing one end joint has end cover spare, the inside integrated into one piece of casing has the plug-in components, and the plug-in components outside has cup jointed the core of pegging graft in the inside casing, the core includes positive plate, negative plate and barrier film, positive plate, negative plate and barrier film twine together, the barrier film is located between positive plate, the negative plate, all set up the recess that is equidistant structural distribution on the casing both sides outer wall, a plurality of is equidistant structural distribution's line groove has been seted up on positive plate, negative plate one side outer wall.

Further, the end cover piece comprises a cover body, and a second glue injection groove is formed in the outer wall of the side face of the cover body.

Furthermore, two connecting columns are inserted into the outer wall of one side of the cover body, and the two connecting columns are respectively electrically connected with the positive plate and the negative plate.

Further, a placement groove is formed in the side inner wall of the shell close to one end, and the cover body is clamped inside the placement groove.

Further, a first glue injection groove communicated with the second glue injection groove is formed in the inner wall of the side face of the placement groove, and a glue injection hole is formed in the inner wall of one side of the glue injection groove.

Further, the shell comprises an adhesive layer, a second metal layer is adhered to the outer wall of the side face of the adhesive layer, and an outer layer is adhered to the outer wall of the side face of the second metal layer.

Further, a first metal layer is adhered to the inner wall of the side face of the bonding layer, and an inner layer is adhered to the outer wall of the side face of the metal layer.

In the technical scheme, the winding type lithium battery cell provided by the utility model has the advantages that (1) through the arranged line grooves, the areas of the positive plate and the negative plate can be increased under the same isolating film by the design of the line grooves, so that the energy density of the cell formed by the positive plate, the negative plate and the isolating film is increased, and the requirement of the existing product can be met without changing the size of the battery; (2) Through the first glue injection groove, the second glue injection groove and the glue injection holes, when the end cover piece is installed in the installation groove, sealing glue can be added into a structure formed by the first glue injection groove and the second glue injection groove through the glue injection holes, so that the end cover piece is fixed on the shell, and the sealing property between the end cover piece and the shell can be improved; (3) Through the first metal layer, the second metal layer and the adhesive layer, the adhesive layer is a mixture of latex, polyurethane glue and the like, and the explosion-proof performance and the anti-falling performance of the shell can be improved by matching the structure formed by the first metal layer and the second metal layer.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.

Fig. 1 is a schematic diagram of an overall structure of a winding type lithium battery cell according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram of an internal structure of a casing provided by an embodiment of a winding type lithium battery cell according to the present utility model.

Fig. 3 is a schematic structural diagram of an end cap member according to an embodiment of the present utility model.

Fig. 4 is a schematic structural diagram of a casing material provided in an embodiment of a winding type lithium battery cell according to the present utility model.

Fig. 5 is a schematic diagram of a core structure provided in an embodiment of a winding type lithium battery cell according to the present utility model.

Reference numerals illustrate:

1. a housing; 2. an end cap member; 3. a groove; 4. an insert; 5. a core; 6. a placement groove; 7. a first glue injection groove; 8. a glue injection hole; 9. a cover body; 10. a connecting column; 11. a second glue injection groove; 12. an inner layer; 13. a first metal layer; 14. an adhesive layer; 15. a second metal layer; 16. an outer layer; 17. a positive plate; 18. a cathode sheet; 19. a separation film; 20. line grooves.

Detailed Description

In order to make the technical scheme of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings.

As shown in fig. 1-5, the winding type lithium battery cell provided by the embodiment of the utility model comprises a shell 1, an end cover 2 is clamped at one end of the shell 1, an insert 4 is integrally formed inside the shell 1, a core body 5 inserted inside the shell 1 is sleeved outside the insert 4, the core body 5 comprises a positive plate 17, a cathode plate 18 and a separation film 19, the positive plate 17, the cathode plate 18 and the separation film 19 are wound together, the separation film 19 is positioned between the positive plate 17 and the cathode plate 18, grooves 3 distributed in equidistance structures are formed in the outer walls of two sides of the shell 1, and a plurality of line grooves 20 distributed in equidistance structures are formed in the outer walls of one side of the positive plate 17 and the outer wall of one side of the cathode plate 18.

Specifically, in this embodiment, including casing 1, casing 1 one end joint has end cover 2, casing 1 inside integrated into one piece has plug-in components 4, plug-in components 4 are convenient for make core 5 install inside casing 1, and plug-in components 4 outside cup joint the core 5 of pegging graft inside casing 1, still be provided with tab (not shown) on the core 5, core 5 includes positive plate 17, negative plate 18 and barrier film 19, barrier film 19 is made by polyamide, positive plate 17, negative plate 18 and barrier film 19 twine together, barrier film 19 is located between positive plate 17, negative plate 18, all offered the recess 3 that are equidistant structural distribution on casing 1 both sides outer wall, the design of recess 3 can improve casing 1 heat conduction radiating capacity for this lithium cell core heat dissipation is accelerated, positive plate 17, a plurality of line groove 20 that are equidistant structural distribution is offered on the outer wall of negative plate 18 side, the design of line groove 20 can increase the area of positive plate 17, negative plate 18 under equal barrier film 19, make positive plate 17, negative plate 18 and barrier film 19's electric capacity that constitutes the electric capacity of electric core that has improved, the electric capacity of electric capacity that has improved.

According to the winding type lithium battery cell provided by the utility model, the area of the positive plate 17 and the area of the cathode plate 18 can be increased under the same isolating film 19 by the design of the line groove 20, so that the energy density of the cell formed by the positive plate 17, the cathode plate 18 and the isolating film 19 can be increased, and the requirement of the existing product can be met without changing the size of the battery.

In another embodiment provided by the utility model, as shown in fig. 2-3, the end cover 2 comprises a cover 9, a second glue injection groove 11 is formed on the outer wall of the side surface of the cover 9, two connecting columns 10 are inserted into the outer wall of one side of the cover 9, the connecting columns 10 are convenient for the connection between the core 5 and the outside, the two connecting columns 10 are respectively electrically connected with a positive plate 17 and a negative plate 18, a placement groove 6 is formed at the position, close to one end, of the inner wall of the side surface of the shell 1, the cover 9 is clamped in the placement groove 6, a first glue injection groove 7 communicated with the second glue injection groove 11 is formed on the inner wall of the side surface of the placement groove 6, the first glue injection groove 7 is matched with the second glue injection groove 11 to form a complete glue injection groove, the subsequent glue injection is convenient, and a glue injection hole 8 is formed in the inner wall of one side of the first glue injection groove 7, so that the sealing glue is convenient for injecting the sealing glue into the first glue injection groove 7, and the end cover 2 and the shell 1 are adhered together.

In still another embodiment of the present utility model, as shown in fig. 4, the casing 1 includes the adhesive layer 14, the second metal layer 15 is adhered to the outer wall of the side surface of the adhesive layer 14, the outer layer 16 is adhered to the outer wall of the side surface of the second metal layer 15, the outer layer 16 is made of high-strength polyethylene plastic, the first metal layer 13 is adhered to the inner wall of the side surface of the adhesive layer 14, and the adhesive layer 14 made of a mixture of latex, polyurethane glue, etc. is matched with the structure formed by the first metal layer 13 and the second metal layer 15, so that the explosion-proof performance and the anti-falling performance of the casing 1 can be improved, the inner layer 12 is adhered to the outer wall of the side surface of the first metal layer 13, and the inner layer 12 is made of plastic with high flame retardance.

Working principle: when the lithium battery cell is assembled, the wound core body 5 can be inserted into the shell 1, at the moment, the installation and positioning of the core body 5 can be realized through the plug-in 4, then the end cover piece 2 is clamped into the installation groove 6, the lugs on the core body 5 are connected with the connecting column 10, then the sealant is added into the structure formed by the first glue injection groove 7 and the second glue injection groove 11 through the glue injection hole 8, the end cover piece 2 is fixed on the shell 1, the tightness between the end cover piece 2 and the shell 1 can be improved, and then when the lithium battery cell operates, the heat conduction and heat dissipation capacity of the shell 1 can be improved through the design of the groove 3, the heat dissipation of the lithium battery cell is accelerated, the area of the positive plate 17 and the cathode plate 18 can be increased under the same isolating film 19 through the design of the line groove 20, the energy density of the cell formed by the positive plate 17, the cathode plate 18 and the isolating film 19 is increased, the capacitance of the battery is improved, the bonding layer 14 formed by the mixture of latex, the glue and the like is matched with the first metal layer 13 and the second metal layer 15, and the explosion-proof performance of the shell 1 can be improved.

While certain exemplary embodiments of the present utility model have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the utility model. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the utility model, which is defined by the appended claims.

Claims (7)

1. The utility model provides a coiling formula lithium battery cell, includes casing (1), its characterized in that, casing (1) one end joint has end cover spare (2), inside integrated into one piece of casing (1) has plug-in components (4), and plug-in components (4) outside has cup jointed core (5) of pegging graft inside casing (1), core (5) include positive plate (17), negative plate (18) and barrier film (19), positive plate (17), negative plate (18) and barrier film (19) twine together, barrier film (19) are located between positive plate (17), negative plate (18), all set up on casing (1) both sides outer wall be equidistant structural distribution's recess (3), a plurality of line groove (20) that are equidistant structural distribution have been seted up on positive plate (17), negative plate (18) one side outer wall.

2. The winding type lithium battery cell according to claim 1, wherein the end cover (2) comprises a cover body (9), and a second glue injection groove (11) is formed in the outer wall of the side face of the cover body (9).

3. The winding type lithium battery cell according to claim 2, wherein two connecting posts (10) are inserted into the outer wall of one side of the cover body (9), and the two connecting posts (10) are respectively electrically connected with the positive plate (17) and the negative plate (18).

4. The winding type lithium battery cell according to claim 2, wherein a placement groove (6) is formed in the side inner wall of the shell (1) near one end, and the cover body (9) is clamped inside the placement groove (6).

5. The winding type lithium battery cell according to claim 4, wherein a first glue injection groove (7) communicated with a second glue injection groove (11) is formed in the inner wall of the side face of the placement groove (6), and a glue injection hole (8) is formed in the inner wall of one side of the first glue injection groove (7).

6. A coiled lithium battery cell according to claim 1, wherein the casing (1) comprises an adhesive layer (14), a second metal layer (15) is adhered to the side outer wall of the adhesive layer (14), and an outer layer (16) is adhered to the side outer wall of the second metal layer (15).

7. The wound lithium battery cell according to claim 6, wherein the first metal layer (13) is adhered to the inner side wall of the adhesive layer (14), and the inner layer (12) is adhered to the outer side wall of the first metal layer (13).