TWM509980U - Lithium battery Core - Google Patents

Description

Lithium battery

This creation is about a lithium battery cell, especially one that can be used for charging and discharging of high current and high current, and to ensure safe use.

At present, the lithium battery core mainly comprises a casing, and the casing is internally provided with an electrolyte solution and a lithium battery core, and the lithium battery core is continuously wound by a positive electrode sheet, a separator film and a negative electrode sheet. Wherein, the positive electrode tab is welded with the positive electrode tab, and the positive electrode tab is welded to the inner wall of the housing to electrically connect the housing to the positive terminal. The negative electrode tab is welded to the negative electrode tab, and the negative electrode tab is welded upward to the bottom of the negative terminal of the housing. In this way, a nut can be respectively screwed through the outer screw of the positive terminal and the top of the negative terminal, and then the different terminals are respectively fixed to output positive and negative power respectively.

However, the above-mentioned negative electrode tab is additionally taken out from the negative electrode sheet and then welded to the bottom of the negative electrode terminal, and the processing procedure is complicated; and the positive electrode tab is welded to the inner wall of the casing and the negative electrode tab is welded to the negative electrode terminal, and the solder joint thereof The quality is not easy to control, and it is often a point-like contact. Therefore, it is easy to cause problems of poor conduction and heat dissipation. It is only suitable for small-current energy storage, and is not suitable for charging and discharging of high-rate and high-current.

In view of this, in order to provide a structure that is different from the conventional technology, and improve The shortcomings described by the creator have accumulated many years of experience and continuous research and development improvements.

One of the purposes of the present invention is to provide a lithium battery cell by forming a negative electrode tab group and a positive electrode tab group on both sides of the winding core, and making the negative electrode conductive sheet and the positive electrode conductive sheet have a large area and a negative electrode tab, respectively. The group and the positive pole group form an electrical connection structure, which can solve the problem of poor conduction and heat dissipation of the conventional lithium battery, and can effectively conduct electricity and heat dissipation to ensure safe use.

One of the purposes of the present invention is to provide a lithium battery cell by forming a negative electrode tab group and a positive electrode tab group on both sides of the winding core, and making the negative electrode conductive sheet and the positive electrode conductive sheet have a large area and a negative electrode tab, respectively. The group and the positive electrode group form an electrical connection structure, and the welding point of the conventional lithium battery can be solved as a point contact, the quality of which is not easy to control, and only suitable for the problem of small current energy storage, and can satisfy the high rate and high current. Charge and discharge use requirements.

For the purpose of the above creation, a lithium battery core provided by the present invention comprises a lower casing and a cover covering the top end of the lower casing, and the cover plate is provided with a first wiring component and a second wiring component, and the lower casing The body content is provided with an electrolyte solution and at least one core, the core has a negative electrode set and a positive electrode set, the negative electrode set is electrically connected to the first wiring component, and the positive electrode set and the second wiring component are electrically connected. The main technical feature of the connection is that the negative electrode tab group and the positive electrode tab group are respectively located on two sides of the winding core; the bottom of the first wiring assembly is combined with the negative electrode conductive sheet, and the negative electrode conductive sheet includes the first positioning portion and the first extension portion. The first positioning portion is electrically connected to the first wire connecting component, the first extending portion extends downward from a side of the first positioning portion in a direction substantially perpendicular to the first positioning portion, and the first extending portion is coupled to the negative electrode tab. And the bottom of the second wiring assembly is combined with the positive conductive sheet, the positive conductive sheet includes a second positioning portion and a second extending portion, the second positioning portion is electrically connected to the second wiring assembly, and the second extending portion is second One of the positioning parts In schematic extends downwardly in a direction perpendicular to the second positioning portion, the extension portion and the second electrode tab connected to the positive group.

In implementation, the cross section of the first extending portion and the cross section of the second extending portion are respectively U-shaped; the first positioning portion and the first extending portion are in an inverted L shape.

In implementation, the negative electrode conductive sheet further includes a third extending portion, and the third extending portion extends downward from the other side of the first positioning portion in a direction substantially perpendicular to the first positioning portion, the first positioning portion, the first extending portion, and The third extension has an inverted U shape.

In implementation, the second positioning portion and the second extending portion are in an inverted L shape. The positive electrode conductive sheet further includes a fourth extending portion, and the fourth extending portion extends downward from the other side of the second positioning portion in a direction substantially perpendicular to the second positioning portion, and the second positioning portion, the second extending portion and the fourth extending portion The department is in inverted U shape.

In the implementation, the present invention further includes a first conductive sheet and a second conductive sheet. The first conductive sheet is attached to the first positioning portion of the negative electrode conductive sheet, and the second conductive sheet is attached to the second positioning portion of the positive electrode conductive sheet. .

In implementation, the top end of the negative electrode tab group forms a first upper corner, the bottom end of the negative pole group forms a first lower corner; and the top end of the positive pole group forms a second upper corner, the bottom of the positive pole set The end forms a second lower corner.

In practice, the creation further includes an insulating rubber sleeve, the lower casing is made of a metal material, and the insulating rubber sleeve is sleeved and placed between the winding core and the lower casing.

In order to facilitate a deeper understanding of this creation, it is detailed later:

1‧‧‧Lithium battery core

2‧‧‧ Lower case

3‧‧‧ Cover

31‧‧‧ top board

32‧‧‧Insulation sheet

4‧‧‧First wiring assembly

5‧‧‧Second wiring assembly

6‧‧‧Volume core

61‧‧‧Negative polar ear set

611‧‧‧Negative pole

612‧‧‧The first upper corner

613‧‧‧First undercut

62‧‧‧ positive pole set

621‧‧‧ positive pole

622‧‧‧Second upper corner

623‧‧‧Second corner

7‧‧‧Negative conductive sheet

71‧‧‧First Positioning Department

72‧‧‧First Extension

73‧‧‧First conductive sheet

74‧‧‧ Third Extension

8‧‧‧ positive conductive sheet

81‧‧‧Second Positioning Department

82‧‧‧Second extension

83‧‧‧Second conductive sheet

84‧‧‧ Fourth Extension

9‧‧‧Insulating rubber sleeve

91‧‧‧Insulation board

Fig. 1 is an exploded view of the first embodiment of the present invention.

Figure 2 is a perspective view of the first embodiment of the present invention.

Figure 3 is a perspective view showing the first and second conductive sheets of the second embodiment of the present invention.

Figure 4 is a perspective view of the first and second conductive sheets of the third embodiment of the present invention.

Figure 5 is a perspective view of the fourth embodiment of the present invention.

Please refer to the first embodiment and the second embodiment. The first embodiment of the lithium battery cell 1 includes a lower casing 2, a cover plate 3, a first wiring assembly 4, and a second wiring assembly 5. At least one core 6, a negative conductive sheet 7, and a positive conductive sheet 8.

The lower casing 2 is a hollow rectangular body having an opening at the top end, and the lower casing 2 is provided with an electrolyte solution, and the cover plate 3 is closed at the top end of the lower casing 2 to close the opening. The cover plate 3 includes a top plate 31 and an insulating sheet 32. The top plate 31 and the insulating sheet 32 overlap each other. The first and second wiring assemblies (4, 5) are respectively located above the two rubber sleeves on the surface of the cover plate 3.

The core 6 is housed in the lower casing 2. The core 6 is preferably laminated with a long strip of positive electrode, a first separator, a strip of negative electrode and a second separator. A plurality of negative electrode tabs 611 are formed on one side of the winding core 6, and the plurality of negative electrode tabs 611 are laminated and pressurized to form a negative electrode tab group 61; and a plurality of negative electrode tabs 61 are formed on the other side of the winding core 6. The positive electrode tabs 621 are stacked and pressurized to form a positive electrode tab group 62. The top end and the bottom end of the negative electrode tab group 61 and the positive electrode tab group 62 are respectively chamfered so that the top end of the negative electrode tab group 61 forms a first upper corner 612, and the bottom end of the negative electrode tab group 61 forms a The first lower corner 613 has a second upper corner 622 formed at the top end of the positive electrode tab group 62, and a second lower corner 623 is formed at the bottom end of the positive electrode tab group 62.

The negative electrode conductive sheet 7 is formed by bending a flat plate, and includes a first positioning portion 71. And a first extending portion 72, the first extending portion 72 extends downward from a side of the first positioning portion 71 in a direction substantially perpendicular to the first positioning portion 71, so that the first positioning portion 71 and the first extending portion 72 The vertical length of the first extension portion 72 is preferably 1/3 or more of the vertical height of the negative electrode tab group 61. The first positioning portion 71 is attached to the first and second conductive sheets 73. The first positioning portion 71 and the first conductive sheet 73 are located below the cover plate 3, and the first wiring assembly 4 is coupled and fixed upward by riveting. The first positioning portion 71, the first conductive sheet 73 and the first wiring assembly 4 are electrically connected. The first extension portion 72 is joined to the negative electrode tab group 61 on the side of the winding core 6 by welding.

The positive conductive sheet 8 is formed by bending a flat plate, and includes a second positioning portion 81 and a second extending portion 82. The second extending portion 82 is substantially perpendicular to the second side of the second positioning portion 81. The direction of the positioning portion 81 extends downward so that the second positioning portion 81 and the second extending portion 82 are substantially in an inverted L shape, and the vertical length of the second extending portion 82 is preferably 1 of the vertical height of the positive electrode tab group 62. /3 or more. The second positioning portion 81 is attached to the second conductive member 83, and the second positioning portion 81 and the second conductive sheet 83 are located under the cover plate 3, and the second wiring assembly 5 is coupled and fixed upward by riveting. The second positioning portion 81, the second conductive sheet 83, and the second wiring assembly 5 are electrically connected. The second extension portion 82 connects the positive electrode tab group 62 on the other side of the winding core 6 by welding.

Referring to FIG. 3 , which is a second embodiment of the present lithium battery cell 1 , which is different from the first embodiment in that after the first extension portion 72 and the second extension portion 82 are respectively bent, The cross section of the first extending portion 72 and the cross section of the second extending portion 82 are respectively U-shaped, thereby increasing the welding area of the first extending portion 72 and the negative electrode tab group 61, and increasing the second extending portion 82 and the positive electrode tab group. 62 welding area.

Referring to FIG. 4 , it is a third embodiment of the lithium battery cell 1 , wherein the negative electrode conductive sheet 7 further includes a third extending portion 74 , and the third extending portion 74 is formed by the first positioning portion 71 . The other side extends downward in a direction substantially perpendicular to the first positioning portion 71, so that the first positioning portion 71, the first extending portion 72, and the third extending portion 74 are in an inverted U shape. The positive conductive sheet 8 further includes a fourth extending portion 84. The fourth extending portion 84 extends downward from the other side of the second positioning portion 81 in a direction substantially perpendicular to the second positioning portion 81, so that the second positioning portion 81, The second extension portion 82 and the fourth extension portion 84 have an inverted U shape. Therefore, the first extension portion 72 and the third extension portion 74 can be respectively soldered to the negative electrode tab group 61 on the side of the different winding cores 6, and the second extension portion 82 and the fourth extension portion 84 are respectively soldered to different ones. The positive electrode tab group 62 on the other side of the core 6 is used to increase the number of cores 6 in the lower casing 2.

As shown in FIG. 5, it is a fourth embodiment of the lithium battery cell 1 in which the lower casing 2 is made of a metal material, and an insulating rubber sleeve 9 is fitted around the periphery of the core 6. And sandwiched between the core 6 and the lower casing 2, and an insulating plate 91 is positioned between the bottom of the cover 3 and the top of the core 6 to prevent short circuit.

Therefore, this creation has the following advantages:

1. The negative electrode tab group and the positive electrode tab group are respectively formed on the two sides of the core of the creation, and the negative electrode conductive sheet and the positive electrode conductive sheet are electrically connected to the negative electrode tab group and the positive electrode tab group respectively in a large area manner. It not only stabilizes the voltage and current of the conduction, but also satisfies the charging and discharging requirements of high-rate and high-current, and can effectively dissipate heat to increase the service life of the product and ensure safe use.

2. The core of the creation is cut at the top end and the bottom end of the negative electrode tab group and the positive electrode tab group respectively. Therefore, when the electrolyte is filled in the housing, the electrolyte is facilitated by the positive and negative electrodes. The sheet absorbs quickly and prevents short circuits.

3. The negative conductive sheet of the present invention can extend the first extending portion and the third extending portion at the same time, and the positive conductive sheet can extend the second extending portion and the fourth extending portion at the same time, so that the negative electrode tabs of different winding cores can be respectively welded. The group and the positive electrode set are used to increase the number of cores and provide high-rate and high-current products.

In summary, according to the content disclosed above, this creation can achieve the intended purpose, providing a charging and discharging use requirement that can not only meet the high rate and high current, but also can effectively improve the conduction and heat dissipation effects, and can ensure the use. The safe lithium battery core is of great value for industrial use, and it proposes a new type of patent application according to law.

1‧‧‧Lithium battery core

2‧‧‧ Lower case

3‧‧‧ Cover

31‧‧‧ top board

32‧‧‧Insulation sheet

4‧‧‧First wiring assembly

5‧‧‧Second wiring assembly

6‧‧‧Volume core

61‧‧‧Negative polar ear set

611‧‧‧Negative pole

612‧‧‧The first upper corner

613‧‧‧First undercut

62‧‧‧ positive pole set

621‧‧‧ positive pole

622‧‧‧Second upper corner

623‧‧‧Second corner

7‧‧‧Negative conductive sheet

71‧‧‧First Positioning Department

72‧‧‧First Extension

73‧‧‧First conductive sheet

8‧‧‧ positive conductive sheet

81‧‧‧Second Positioning Department

82‧‧‧Second extension

83‧‧‧Second conductive sheet

Claims (10)

A lithium battery core includes a lower casing and a cover plate attached to a top end of the lower casing, the cover plate is provided with a first wiring component and a second wiring component, wherein the lower casing is provided with an electrolyte solution and At least one core, the core has a negative electrode set and a positive electrode set, the negative electrode set is electrically connected to the first wiring component, and the positive electrode set is electrically connected to the second wiring component The negative electrode tab group and the positive electrode tab group are respectively located on two sides of the winding core; the bottom of the first wiring assembly is combined with a negative electrode conductive sheet, and the negative electrode conductive sheet includes a first positioning portion and a The first extending portion is electrically connected to the first connecting component, and the first extending portion extends downward from a side of the first positioning portion in a direction substantially perpendicular to the first positioning portion. And the first extension portion is coupled to the negative electrode tab group; and the bottom portion of the second wiring assembly is coupled to a positive electrode conductive sheet, the positive electrode conductive sheet includes a second positioning portion and a second extending portion, and the second positioning portion is The second wiring component is electrically connected, A second portion extending in a schematic vertically extending from one side of the second positioning portion in a direction of the second positioning portion of the downwardly extending portion and the second electrode tab connected to the positive group. The lithium battery cell according to claim 1, wherein the cross section of the first extension portion and the cross section of the second extension portion are U-shaped, respectively. The lithium battery cell according to claim 1 or 2, wherein the first positioning portion and the first extending portion are in an inverted L shape. The lithium battery cell of claim 3, wherein the negative electrode conductive sheet further comprises a third extension portion, the third extension portion being substantially perpendicular to the first side of the first positioning portion The direction of the positioning portion extends downward, and the first positioning portion, the first extending portion and the third extending portion are in an inverted U shape. The lithium battery cell according to claim 1 or 2, wherein the second positioning portion and the The second extension is in an inverted L shape. The lithium battery cell of claim 5, wherein the positive electrode conductive sheet further comprises a fourth extension portion, the fourth extension portion being substantially perpendicular to the second side of the second positioning portion The direction of the positioning portion extends downward, and the second positioning portion, the second extending portion and the fourth extending portion are in an inverted U shape. The lithium battery cell of claim 1, further comprising a first conductive sheet and a second conductive sheet, the first conductive sheet being attached to the first positioning portion of the negative conductive sheet, The second conductive sheet is attached to the second positioning portion of the positive electrode conductive sheet. The lithium battery cell according to claim 1, wherein the top end of the negative electrode tab group forms a first upper corner, and the bottom end of the negative electrode tab group forms a first lower corner. The lithium battery cell according to claim 1, wherein the top end of the positive electrode tab group forms a second upper corner, and the bottom end of the positive electrode tab group forms a second lower corner. The lithium battery cell of claim 1, further comprising an insulating rubber sleeve, wherein the lower casing is made of a metal material, and the insulating rubber sleeve is sleeved with the core and sandwiched between the core and Between the lower casings.