阅读说明：本技术 多极耳电芯结构 (Multi-tab battery cell structure ) 是由 刘海 戈志敏 王乾 宾术 韦向红 黎莉 彭希虹 张文瑞 于 2021-09-17 设计创作，主要内容包括：本发明提供一种多极耳电芯结构。所述多极耳电芯结构包括正极极片、负极极片以及隔膜,所述正极极片、所述负极极片以及所述隔膜依次叠放并卷绕成卷芯,所述正极极片具有至少一个正极耳,所述负极级片具有至少一个负极耳,所述正极耳位于所述卷芯的一侧,所述负极耳位于所述卷芯的另一侧。本发明的多极耳电芯结构与现有多极耳重叠结构相比,多极耳极片改善结构,解决对设备的依赖性,其采用连接片结构将多极耳进行连接,对卷绕设备的要求和极耳位置的要求更低,提高电芯制备的生产优率。(The invention provides a multi-tab battery cell structure. The multi-tab battery cell structure comprises a positive pole piece, a negative pole piece and a diaphragm, wherein the positive pole piece, the negative pole piece and the diaphragm are sequentially stacked and wound into a winding core, the positive pole piece is provided with at least one positive tab, the negative pole piece is provided with at least one negative tab, the positive tab is positioned on one side of the winding core, and the negative tab is positioned on the other side of the winding core. Compared with the existing multi-tab overlapping structure, the multi-tab battery cell structure has the advantages that the multi-tab pole piece improves the structure, the dependence on equipment is solved, the multi-tab is connected by adopting the connecting sheet structure, the requirements on winding equipment and the tab position are lower, and the production yield of battery cell preparation is improved.)

1. The multi-tab battery cell structure is characterized by comprising a positive pole piece, a negative pole piece and a diaphragm, wherein the positive pole piece, the negative pole piece and the diaphragm are sequentially stacked and wound into a winding core, the positive pole piece is provided with at least one positive tab, the negative pole piece is provided with at least one negative tab, the positive tab is positioned on one side of the winding core, and the negative tab is positioned on the other side of the winding core.

2. The multi-tab battery cell structure of claim 1, wherein the number of the positive tabs is multiple, the positive tabs are connected through a first connecting piece, the number of the negative tabs is multiple, and the negative tabs are connected through a second connecting piece.

3. The multi-tab battery cell structure of claim 1, wherein the number of the positive tabs is 2, one of the positive tabs is a first positive tab, the other positive tab is a second positive tab, and the first positive tab and the second positive tab are connected through the first connecting plate.

4. The multi-tab battery cell structure of claim 1, wherein the number of the positive tabs is 2, one of the positive tabs is a first positive tab, the other of the positive tabs is a second positive tab, the first positive tab and the second positive tab are connected through the first connecting piece, the number of the negative tabs is 2, one of the negative tabs is a first negative tab, the other of the negative tabs is a second negative tab, and the first negative tab and the second negative tab are connected through the second connecting piece.

5. The multi-tab cell structure of claim 4, wherein the first and second connection tabs are each at least one of copper, nickel, aluminum, silver.

6. The multi-tab cell structure of claim 3, wherein the first connection tab is T-shaped.

7. The multi-tab cell structure of claim 5, wherein the first connecting tab is L-shaped and the second connecting tab is L-shaped.

Technical Field

The invention relates to the technical field of lithium ion batteries, in particular to a multi-tab battery cell structure.

Background

The lithium ion battery has the advantages of high working voltage, high energy density, long cycle life, no memory effect and the like, so the lithium ion battery is widely applied to the aspects of notebook computers, digital products, mobile communication and the like.

With the rapid development of electronic devices, people also put higher demands on lithium ion batteries, especially high-rate lithium ion batteries. For example, please refer to fig. 1, CN201620868345.3 electric core mainly adopts a pole piece with a multi-pole tab structure, the requirement for alignment between the pole tab position and the winding machine is high by adopting the multi-pole tab structure, the equipment universality is not strong, the problem of pole tab dislocation is easy to occur, the production yield is affected, and the production cost is high.

Disclosure of Invention

Based on the structure, the invention provides the multi-tab battery cell structure, the multi-tab pole piece improves the structure, the dependence on equipment is solved, and the production yield of battery cell preparation is improved.

The invention provides a multi-tab battery cell structure which comprises a positive pole piece, a negative pole piece and a diaphragm, wherein the positive pole piece, the negative pole piece and the diaphragm are sequentially stacked and wound into a winding core, the positive pole piece is provided with at least one positive tab, the negative pole piece is provided with at least one negative tab, the positive tab is positioned on one side of the winding core, and the negative tab is positioned on the other side of the winding core.

Furthermore, the number of the positive lugs is a plurality of, and is a plurality of the positive lugs are connected through the first connecting piece, the number of the negative lugs is a plurality of, and is a plurality of the negative lugs are connected through the second connecting piece.

Furthermore, the number of the positive lugs is 2, one positive lug is a first positive lug, the other positive lug is a second positive lug, and the first positive lug and the second positive lug are connected through the first connecting sheet.

Further, the setting quantity of positive tab is 2, one of them positive tab is first positive tab, another positive tab is the positive tab of second, first positive tab with the positive tab of second passes through first connection piece is connected, the setting quantity of negative tab is 2, one of them negative pole ear is first negative pole ear, another negative pole ear is the second negative pole ear, first negative pole ear with the second negative pole ear passes through the second connection piece is connected.

Further, the first connecting sheet and the second connecting sheet are both at least one of copper, nickel, aluminum and silver.

Further, the first connecting piece is T-shaped.

Furthermore, the first connecting piece is L-shaped, and the second connecting piece is L-shaped.

According to the multi-tab battery cell structure, the positive pole piece, the negative pole piece and the diaphragm are sequentially stacked and wound into the winding core, the positive pole piece is provided with at least one positive tab, the negative pole piece is provided with at least one negative tab, the positive tab is positioned on one side of the winding core, and the negative tab is positioned on the other side of the winding core. Compared with the existing multi-tab overlapping structure, the multi-tab battery cell structure has the advantages that the structure of the multi-tab pole piece is improved, the dependence on equipment is solved, and the production rate of battery cell preparation is improved; specifically, the multi-tab is connected by adopting a connecting piece structure, the requirements on winding equipment and the tab position are lower, and the production yield of battery core preparation is improved.

Drawings

Fig. 1 is a schematic structural diagram of a conventional tab cell structure;

fig. 2 is a schematic structural diagram of a positive electrode plate of the multi-tab cell structure according to the present invention;

fig. 3 is a schematic structural diagram of a negative electrode plate of the multi-tab cell structure of the present invention;

fig. 4 is a schematic structural diagram of a multi-tab cell structure according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a multi-tab cell structure according to another embodiment of the present invention.

Reference numerals

The positive electrode tab comprises a first positive electrode tab 1, a second positive electrode tab 2, a positive electrode pole piece 3, a first negative electrode tab 4, a negative electrode pole piece 5 and a first connecting piece 6.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Referring to fig. 2 to 5, the present invention provides a multi-tab battery cell structure, including a positive electrode tab 3, a negative electrode tab 5, and a diaphragm, where the positive electrode tab, the negative electrode tab, and the diaphragm are sequentially stacked and wound into a roll core, the positive electrode tab has at least one positive electrode tab, the negative electrode tab has at least one negative electrode tab, the positive electrode tab is located on one side of the roll core, and the negative electrode tab is located on the other side of the roll core.

The number of the positive lugs and the number of the negative lugs are not limited, when the number of the positive lugs is multiple, the positive lugs are connected through the first connecting pieces 6, and when the number of the negative lugs is multiple, the negative lugs are connected through the second connecting pieces.

For example, the number of the positive electrode tabs is 2, one positive electrode tab is a first positive electrode tab 1, the other positive electrode tab is a second positive electrode tab 2, and the first positive electrode tab and the second positive electrode tab are connected through the first connecting piece.

For example, the number of the positive electrode tabs is 2, one of the positive electrode tabs is a first positive electrode tab 1, the other of the positive electrode tabs is a second positive electrode tab 2, the first positive electrode tab and the second positive electrode tab are connected through the first connecting sheet, the number of the negative electrode tabs is 2, one of the negative electrode tabs is a first negative electrode tab 4, the other negative electrode tab is a second negative electrode tab, and the first negative electrode tab and the second negative electrode tab are connected through the second connecting sheet.

The first connecting sheet and the second connecting sheet can be one or a combination of metals such as copper, nickel, aluminum, silver and the like. For example, the first and second connection pieces are both made of copper or nickel or aluminum or silver material.

And under the premise of ensuring that the positive tab is positioned on the same side after being wound into the battery cell and the negative tab is positioned on the other side, the positive tab and the negative tab can be positioned at any positions of the winding core.

Wherein the first connecting sheet and the second connecting sheet are shaped according to the requirement of a winding core. For example, the first connecting piece may be T-shaped, or the first connecting piece may be L-shaped and the second connecting piece may be L-shaped.

In one embodiment, the multi-tab cell structure includes a positive electrode tab, a negative electrode tab and a diaphragm, the positive electrode tab includes two tabs, the first positive electrode tab is located at the leftmost side of the positive electrode tab, the second positive electrode tab is located at one third of the left side of the positive electrode tab, the negative electrode tab is one tab, and the first negative electrode tab is located at one third of the right side of the negative electrode tab; the positive pole piece, the diaphragm and the negative pole piece are sequentially stacked and wound into a roll core. All positive lugs are located on the same side of the winding core and connected through a T-shaped first connecting piece, all negative lugs are located on the other side of the winding core, and the first connecting piece is made of a copper nickel-plated belt.

In another embodiment, the multi-tab cell structure includes a positive electrode tab, a negative electrode tab and a diaphragm, the positive electrode tabs are two tabs, the first positive electrode tab is located at the leftmost side of the positive electrode tab, and the second positive electrode tab is located at one third of the left side of the positive electrode tab; the negative electrode tab is a tab, the first negative electrode tab is positioned at one third of the right side of the negative electrode tab, the positive electrode tab, the diaphragm and the negative electrode tab are sequentially stacked and wound into a winding core, all the positive electrode tabs are positioned at the same side of the winding core and are connected through a first connection piece in a straight shape, all the negative electrode tabs are positioned at the other side of the winding core, and the first connection piece is made of a nickel tape.

As can be appreciated, in yet another embodiment, the multi-tab cell structure includes a positive electrode tab, a negative electrode tab and a diaphragm, the positive electrode tabs are two tabs, the first positive electrode tab is located at the leftmost side of the positive electrode tab, and the second positive electrode tab is located at one third of the left side of the positive electrode tab; the cathode lug is a lug, the first cathode lug is positioned at the leftmost side of the cathode pole piece, the second cathode lug is positioned at one half of the cathode pole piece, the diaphragm and the cathode pole piece are sequentially stacked and wound into a winding core, all the cathode lugs are positioned at the same side of the winding core and are connected through an L-shaped first connecting piece, all the cathode lugs are positioned at the other side of the winding core and are connected through an L-shaped second connecting piece, and the first connecting piece and the second connecting piece are made of copper nickel-plated tapes.

According to the multi-tab battery cell structure, the positive pole piece, the negative pole piece and the diaphragm are sequentially stacked and wound into the winding core, the positive pole piece is provided with at least one positive tab, the negative pole piece is provided with at least one negative tab, the positive tab is positioned on one side of the winding core, and the negative tab is positioned on the other side of the winding core. Compared with the existing multi-tab overlapping structure, the multi-tab battery cell structure has the advantages that the structure of the multi-tab pole piece is improved, the dependence on equipment is solved, and the production rate of battery cell preparation is improved; specifically, the multi-tab is connected by adopting a connecting piece structure, the requirements on winding equipment and the tab position are lower, and the production yield of battery core preparation is improved.

The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.