Lithium ion battery and battery cell thereof

By using a positive and negative electrode sheet with electrode ears in the lithium-ion battery cell and insulating the protruding diaphragm, the cost and space brought about by the use and installation steps of insulating gaskets in the prior art is solved. The problem has achieved simplification and cost reduction in battery production.

CN222191070UActive Publication Date: 2024-12-17MIANYANG CHUANGMING INTELLIGENT BATTERY CO LTD +1
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Patent Information

Application Number
CN202420232004.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-01-30
Publication Date
2024-12-17
Estimated Expiration
2034-01-30

AI Technical Summary

Technical Problem

In the production process, existing lithium-ion batteries require insulating gaskets to prevent contact short circuits of positive and negative electrodes, resulting in increased equipment costs and space requirements.

Method used

A lithium-ion battery cell is designed, and a positive electrode sheet and a negative electrode sheet with a positive electrode ear and a negative electrode ear are used to replace the insulating gasket with a diaphragm protruding to the first and second ends. The housing and cover are isolated, thus eliminating the use and installation steps of insulating gaskets.

Benefits of technology

It effectively solves the cost and space problems caused by the use and installation steps of insulating gaskets, simplifies the production process, and reduces equipment costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a lithium ion battery and a battery cell thereof. The battery cell comprises a positive pole piece with a positive pole lug, a negative pole piece with a negative pole lug and a diaphragm for insulating and separating the positive pole piece from the negative pole piece. The transverse width size of the diaphragm is larger than the transverse width size of the positive pole piece and the transverse width size of the negative pole piece, the diaphragm is provided with a first tail end and a second tail end in the transverse width direction, the first tail end and the second tail end both protrude out of the positive pole piece and the negative pole piece, the positive pole lug protrudes out of the first tail end of the diaphragm in the transverse width direction of the positive pole piece, and the negative pole lug protrudes out of the second tail end of the diaphragm in the transverse width direction of the negative pole piece. And the negative pole lug protrudes out of the second tail end of the diaphragm in the transverse width direction of the negative pole piece. According to the battery cell disclosed by the utility model, the first tail end and the second tail end, which are opposite to each other, of the diaphragm protrude out of the positive pole piece and the negative pole piece, the first tail end of the diaphragm plays a role in isolating the shell, the positive pole piece and the negative pole piece, and the second tail end of the diaphragm plays a role in isolating the cover body, the positive pole piece and the negative pole piece; and the use of an insulating spacer is omitted.
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Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a lithium ion battery and a battery core thereof. Background Art

[0002] With the continuous increase in the market share of new energy vehicles, a good platform will be provided for the vigorous development of the power battery industry, thereby accelerating the pace of development of the battery industry.

[0003] Among them, for mainstream batteries in the market (such as cylindrical batteries), insulating gaskets are used to prevent short circuits between positive and negative electrodes. Since insulating gaskets are required, the production process needs to add an operation step of installing insulating gaskets, which results in the addition of a mechanical arm and an induction transmission device to the integrated equipment, increasing space and equipment costs.

[0004] Therefore, a lithium ion battery and a battery cell thereof are provided to overcome one or more of the above-mentioned defects. Utility Model Content

[0005] An object of the utility model is to provide a lithium ion battery cell to omit an insulating gasket and its installation steps, thereby solving the cost and space problems caused by the steps.

[0006] Another object of the present invention is to provide a lithium-ion battery to omit the insulating gasket and the installation steps thereof, thereby solving the cost and space problems caused by the steps.

[0007] To achieve the above-mentioned purpose, the lithium-ion battery cell of the utility model comprises a positive electrode sheet with a positive electrode tab, a negative electrode sheet with a negative electrode tab, and a diaphragm insulating and separating the positive electrode sheet and the negative electrode sheet. The diaphragm has a transverse width dimension greater than the transverse width dimensions of both the positive electrode sheet and the negative electrode sheet, and the diaphragm has a first end and a second end opposite to each other in the transverse width direction, and the first end and the second end both protrude from the positive electrode sheet and the negative electrode sheet, and the positive electrode tab protrudes from the first end of the diaphragm in the transverse width direction of the positive electrode sheet, and the negative electrode tab protrudes from the second end of the diaphragm in the transverse width direction of the negative electrode sheet.

[0008] Compared with the prior art, the first end and the second end of the diaphragm protrude from the positive electrode sheet and the negative electrode sheet, and the first end of the diaphragm plays an insulating role in isolating the shell, the positive electrode sheet and the negative electrode sheet, and the second end of the diaphragm plays an insulating role in isolating the cover body, the positive electrode sheet and the negative electrode sheet. Therefore, the lithium-ion battery cell of the utility model eliminates the use of an insulating gasket, thereby eliminating the installation step of the insulating gasket and solving the cost and space problems caused by the installation step.

[0009] Preferably, the positive electrode sheet, the negative electrode sheet and the separator are in a roll shape; or, the positive electrode sheet, the negative electrode sheet and the separator are in a folded shape that is folded back and forth.

[0010] Preferably, the positive electrode sheet and the negative electrode sheet have the same lateral width.

[0011] Preferably, the positive electrode plate is arranged flush with the negative electrode plate in the lateral width direction of the positive electrode plate.

[0012] Preferably, the positive electrode sheet is staggered with the negative electrode sheet in the lateral width direction of the positive electrode sheet.

[0013] Preferably, the first end and the second end of the separator protrude from the positive electrode plate by the same amount.

[0014] To achieve the above-mentioned purpose, the lithium-ion battery of the utility model comprises a shell, a cover body assembled and connected to the shell, and the aforementioned battery cell. The first end of the diaphragm abuts against one of the cover body and the shell, and the positive electrode tab is welded to the one, the second end of the diaphragm abuts against the other of the cover body and the shell, and the negative electrode tab is welded to the other.

[0015] Compared with the prior art, the first end and the second end of the diaphragm protrude from the positive electrode sheet and the negative electrode sheet, and the first end of the diaphragm plays an insulating role in isolating the shell, the positive electrode sheet and the negative electrode sheet, and the second end of the diaphragm plays an insulating role in isolating the cover body, the positive electrode sheet and the negative electrode sheet. Therefore, the lithium-ion battery of the utility model eliminates the use of an insulating gasket, thereby eliminating the installation step of the insulating gasket and solving the cost and space problems caused by the installation step.

[0016] Preferably, the cover is located directly above the shell.

[0017] Preferably, the shell is cylindrical in shape, the cover is a round cover, and the battery core is a wound battery core.

[0018] Preferably, the shell is a steel shell or an aluminum shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of a battery cell in a lithium-ion battery of the present invention.

[0020] Figure 2 yes Figure 1 A three-dimensional view of the battery cell shown at another angle.

[0021] Figure 3 yes Figure 1 A plan view of the battery cell is shown.

[0022] Figure 4 It is a plan view showing the positional relationship between the separator, the positive electrode sheet with the positive electrode tab, and the negative electrode with the negative electrode tab when not wound.

[0023] Figure 5 It shows that it contains Figure 3 A plan view of a lithium-ion battery of the cell shown, with only the housing and cover being cut away. DETAILED DESCRIPTION

[0024] Embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals represent like elements.

[0025] See also Figures 1 to 4 , applied to Figure 5 The battery cell 10 of the lithium-ion battery 100 shown in the figure comprises a positive electrode sheet 11 with a positive electrode tab 111, a negative electrode sheet 12 with a negative electrode tab 121, and a separator 13 for insulating and separating the positive electrode sheet 11 from the negative electrode sheet 12. Figure 1 and Figure 2 As an example, the positive electrode sheet 11, the negative electrode sheet 12 and the separator 13 are all in a roll shape, so that the battery cell 10 is a wound battery cell, that is, by Figure 4 The stacked positive electrode sheet 11, negative electrode sheet 12 and separator 13 are wound together; obviously, in other embodiments, the positive electrode sheet 11, negative electrode sheet 12 and separator 13 can also be designed to be folded back and forth, so that the battery cell 10 is a folded battery cell, that is, by Figure 4 The stacked positive electrode sheet 11, negative electrode sheet 12 and separator 13 are folded back and forth according to a preset shape (such as but not limited to a "Z" shape), so they are not Figure 1 and Figure 2 Limits shown.

[0026] At the same time, the lateral width D of the diaphragm 13 3 Greater than the horizontal width D of the positive electrode sheet 11 1 , the transverse width D of the diaphragm 13 3 It is also larger than the horizontal width D of the negative electrode plate 12 2 The diaphragm 13 has a first end 131 and a second end 132 opposite to each other in its transverse width direction (i.e., indicated by the double arrow A), and the first end 131 of the diaphragm 13 protrudes from the positive electrode sheet 11 and the negative electrode sheet 12, and the second end 132 of the diaphragm 13 protrudes from the positive electrode sheet 11 and the negative electrode sheet 12, as shown in FIG. Figure 4 As shown; Optionally, as an example, Figure 4Based on the above, the first end 131 of the diaphragm 13 protrudes downward from the positive electrode sheet 11 and the negative electrode sheet 12, and the second end 132 of the diaphragm 13 protrudes upward from the positive electrode sheet 11 and the negative electrode sheet 12; obviously, in other embodiments, the protruding direction of the first end 131 of the diaphragm 13 and the protruding direction of the second end 132 can also be other directions, so it is not necessary to use Figure 4 Limits shown.

[0027] Furthermore, the positive electrode tab 111 protrudes from the first end 131 of the diaphragm 13 in the horizontal width direction of the positive electrode sheet 11 (i.e., indicated by the double arrow A), so as to ensure that the positive electrode sheet 11 separated by the first end 131 of the diaphragm 13 in the horizontal width direction can be welded to the shell 20 with the help of the positive electrode tab 111; the negative electrode tab 121 protrudes from the second end 132 of the diaphragm 13 in the horizontal width direction of the negative electrode sheet 12, so as to ensure that the negative electrode sheet 12 separated by the second end 132 of the diaphragm 13 in the horizontal width direction can be welded to the cover 30 with the help of the negative electrode tab 121, as shown in FIG. Figure 5 It should be noted that although Figure 5 The welding between the negative electrode tab 121 and the cover 30 and the welding between the positive electrode tab 111 and the shell 20 are shown; obviously, in other embodiments, the welding between the negative electrode tab 121 and the shell 20 and the welding between the positive electrode tab 111 and the cover 30 can also be made, so it is not shown in FIG. Figure 5 More specifically, as follows:

[0028] like Figure 4 As shown, the horizontal width D of the positive electrode sheet 11 1 and the horizontal width D of the negative electrode sheet 12 2 The positive electrode sheet 11 is arranged in a staggered manner with the negative electrode sheet 12 in the lateral width direction of the positive electrode sheet 11, for example, Figure 4 As an example, the positive electrode sheet 11 is offset upwardly by a preset distance relative to the negative electrode sheet 12, so that the positive electrode sheet 11 and the negative electrode sheet 12 are offset from each other, so that the value of the first end 131 of the diaphragm 13 protruding from the negative electrode sheet 12 is smaller than the value of the second end 132 of the diaphragm 13 protruding from the negative electrode sheet 12; obviously, in other embodiments, the positive electrode sheet 11 can also be offset downwardly by a preset distance relative to the negative electrode sheet 12, or the positive electrode sheet 11 is arranged flush with the negative electrode sheet 12 in the horizontal width direction of the positive electrode sheet 11 (as indicated by the double arrow A), so it is not necessary to Figure 4 In addition, the first end 131 and the second end 132 of the separator 13 protrude from the positive electrode sheet 11 by the same amount, so that the center lines of the separator 13 and the positive electrode sheet 11 in the longitudinal direction coincide with each other. Figure 4As shown; such a design can effectively control the protrusion of the first end 131 and the second end 132 of the diaphragm 13 from the positive electrode 11, thereby preventing the protrusion from being too large and affecting the welding of the positive electrode tab 111 and the negative electrode tab 121, and preventing the protrusion from being too short and having no insulation effect.

[0029] See also Figure 5 The lithium-ion battery 100 of the present invention includes a shell 20, a cover body 30 assembled and connected to the shell 20, and the aforementioned battery cell 10. Optionally, as an example, the shell 20 is cylindrical in shape, the cover body 30 is a round cover body, and the battery cell 10 is a wound battery cell, so that the lithium-ion battery 100 of the present invention is a cylindrical battery; obviously, in other embodiments, when the battery cell 10 is a folded battery cell, the shell 20 at this time can be made into a square shell, and correspondingly, the cover body 30 can be made into a square cover. In addition, the first end 131 of the diaphragm 13 abuts against the shell 20, and the positive electrode tab 111 is welded to the shell 20. Specifically, the first end 131 of the diaphragm 13 abuts against the bottom 21 of the shell 20, and the positive electrode tab 111 is welded to the bottom 21 of the shell 20; and the second end 132 of the diaphragm 13 abuts against the cover body 30, and the negative electrode tab 121 is welded to the cover body 30. The state is shown in FIG. Figure 5 Specifically, Figure 5 In the embodiment, as an example, the cover 30 is located directly above the housing 20, and the housing 20 is a steel shell or an aluminum shell, so that the housing 20 can be manufactured by a stretching process, thereby simplifying the manufacturing process of the housing 20. It should be noted that although Figure 5 The figure shows that the first end 131 of the diaphragm 13 is in contact with the housing 20, and the positive electrode tab 111 is welded to the housing 20; the second end 132 of the diaphragm 13 is in contact with the cover 30, and the negative electrode tab 121 is welded to the cover 30; however, according to actual needs, the first end 131 of the diaphragm 13 can also be in contact with the cover 30 and the second end 132 of the diaphragm 13 can be in contact with the housing 20, and correspondingly, the positive electrode tab 111 is welded to the cover 30 and the negative electrode tab 121 is welded to the housing 20, so this is not used. Figure 5 Limits shown.

[0030] Compared with the prior art, the first end 131 and the second end 132 of the diaphragm 13 protrude from the positive electrode sheet 11 and the negative electrode sheet 12, and the first end 131 of the diaphragm 13 plays an insulating role in isolating the shell 20, the positive electrode sheet 11 and the negative electrode sheet 12, and the second end 132 of the diaphragm 13 plays an insulating role in isolating the cover 30, the positive electrode sheet 11 and the negative electrode sheet 12. Therefore, the battery cell 10 of the lithium-ion battery 100 of the present invention eliminates the use of insulating gaskets, thereby eliminating the installation step of insulating gaskets, and solving the cost and space problems caused by the installation step. Similarly, since the lithium-ion battery 100 of the present invention includes the battery cell 10, the lithium-ion battery 100 of the present invention can eliminate the use of insulating gaskets, thereby eliminating the installation step of insulating gaskets, and solving the cost and space problems caused by the installation step.

[0031] It is worth noting that the direction indicated by the double arrows in the drawings is the horizontal width direction. In addition, since the positive electrode tab 111 is welded to one of the cover 30 and the shell 20, and the negative electrode tab 121 is welded to the other of the cover 30 and the shell 20, an insulation design is required between the cover 30 and the shell 20, but this is well known in the art and will not be described here.

[0032] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A lithium-ion battery cell, comprising a positive electrode sheet with a positive electrode tab, a negative electrode sheet with a negative electrode tab, and a separator insulating and separating the positive electrode sheet from the negative electrode sheet, It is characterized in that The diaphragm has a transverse width dimension greater than that of both the positive electrode sheet and the negative electrode sheet. The diaphragm has a first end and a second end opposite to each other in the transverse width direction. Both the first end and the second end protrude from the positive electrode sheet and the negative electrode sheet. The positive electrode tab protrudes from the first end of the diaphragm in the transverse width direction of the positive electrode sheet, and the negative electrode tab protrudes from the second end of the diaphragm in the transverse width direction of the negative electrode sheet.

2. The battery cell according to claim 1, It is characterized in that The positive electrode sheet, the negative electrode sheet and the separator are in a roll shape; or, the positive electrode sheet, the negative electrode sheet and the separator are in a folded shape that is folded back and forth.

3. The battery cell according to claim 1, It is characterized in that The positive electrode sheet and the negative electrode sheet have the same transverse width.

4. The battery cell according to claim 3, It is characterized in that The positive electrode sheet is arranged flush with the negative electrode sheet in the lateral width direction of the positive electrode sheet.

5. The battery cell according to claim 3, It is characterized in that The positive electrode sheet is arranged in a staggered manner with respect to the negative electrode sheet in the lateral width direction of the positive electrode sheet.

6. The battery cell according to claim 1, It is characterized in that The first end and the second end of the separator protrude from the positive electrode plate by the same amount.

7. A lithium ion battery comprising a housing and a cover body assembled and connected to the housing, It is characterized in that The lithium-ion battery also includes a battery cell according to any one of claims 1 to 6, wherein the first end of the diaphragm abuts against one of the cover and the shell, and the positive electrode tab is welded to the one, and the second end of the diaphragm abuts against the other of the cover and the shell, and the negative electrode tab is welded to the other.

8. The lithium ion battery according to claim 7, It is characterized in that The cover is located directly above the shell.

9. The lithium ion battery according to claim 7, It is characterized in that The shell is cylindrical in shape, the cover is a round cover, and the battery core is a wound battery core.

10. The lithium ion battery according to claim 7, It is characterized in that The shell is a steel shell or an aluminum shell.