Negative electrode guide sheet end face welding battery capable of reducing internal resistance of battery

Abstract

The utility model discloses a battery capable of reducing internal resistance of a battery and welded on the end surface of a negative electrode guide sheet, which comprises a hollow battery cell, a positive electrode guide sheet and a negative electrode guide sheet, and the positive electrode guide sheet and the negative electrode guide sheet are respectively and correspondingly contacted and conducted with the positive electrode end and the negative electrode end of the battery cell. A welding assembly for increasing the contact area with the battery cell is arranged on the negative electrode guide sheet, and the battery cell and the negative electrode guide sheet are welded by the welding assembly. The battery has the effects that the positive electrode guide sheet and the negative electrode guide sheet are in contact conduction with the positive electrode and the negative electrode of the battery core, and the end surface of the negative electrode guide sheet is welded with the battery core, so that the contact area is increased and the internal resistance of the battery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery with negative electrode lead end face welding for reducing the internal resistance of the battery. Background Art

[0002] The traditional cylindrical battery manufacturing process involves first applying electrode material to the positive and negative electrodes, then separating them with a separator to form a separator-positive electrode-separator-negative electrode stack. The battery is then wound to form a core. The corresponding tabs are then welded to the positive and negative electrodes, extending toward the positive or negative ends. The core is then placed directly inside a steel casing, and the tabs are welded to the bottom of the casing and the cap to form the battery. However, the tabs extending from the battery electrodes are small, resulting in a high internal resistance in the battery after welding. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a battery with negative electrode lead end face welding which reduces the internal resistance of the battery.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A battery with negative electrode conductor end face welding for reducing battery internal resistance comprises: a hollow battery cell, a positive electrode conductor and a negative electrode conductor, wherein the positive electrode conductor and the negative electrode conductor are respectively in contact and conductive with the positive terminal and the negative terminal of the battery cell, and the negative electrode conductor is provided with a welding assembly for increasing the contact area with the battery cell, and the welding assembly welds the battery cell to the negative electrode conductor.

[0006] In one embodiment, the battery cell includes a positive electrode sheet, a separator and a negative electrode sheet. The positive electrode sheet, the separator and the negative electrode sheet are stacked and wound in sequence to form a hollow battery cell, and the innermost layer and the outermost layer of the battery cell are both the separator.

[0007] In one embodiment, a negative electrode tab is welded to a section of the negative electrode sheet in the battery cell facing the negative electrode conductor, the negative electrode tab is in contact with and connected to the negative electrode conductor, and the welding assembly is arranged on the end face of the negative electrode conductor located on the outside of the battery cell.

[0008] In one embodiment, the welding assembly includes internal welding points and external welding points, and the internal welding points and the external welding points are arranged in pairs. There are two pairs of internal welding points and two pairs of external welding points. The two pairs of internal welding points are symmetrically distributed, and the two pairs of external welding points are symmetrically distributed. The two pairs of internal welding points and the two pairs of external welding points are staggered with each other.

[0009] In one embodiment, both the internal welding point and the external welding point are conductively connected to the negative electrode tab.

[0010] In one embodiment, an opening is provided between two adjacent pairs of the internal welding points and the external welding points, and the opening passes through the upper and lower sides of the negative electrode conductor. The opening is used for air convection to improve the heat dissipation effect of the negative electrode conductor and to prevent the negative electrode conductor from being deformed by welding and affecting other positions of the negative electrode conductor.

[0011] In one embodiment, cutouts are provided on two opposite outer sides of the negative electrode conductor, and the two cutouts are arranged in parallel to achieve a positioning effect.

[0012] In one embodiment, the positive electrode lead and the negative electrode lead are both disc-shaped.

[0013] In one embodiment, the positive electrode lead and the negative electrode lead are both made of conductive metal.

[0014] Compared with the prior art, the present invention has at least the following advantages:

[0015] The utility model discloses a battery with negative electrode lead end face welding for reducing battery internal resistance. A positive electrode lead and a negative electrode lead are respectively provided at both ends of the battery cell to connect the positive electrode sheet and the negative electrode sheet in the battery cell. An internal welding point and an external welding point are provided on the negative electrode sheet. The contact area and the conductive area between the negative electrode lead and the battery cell are increased by welding, thereby reducing the internal resistance of the battery and improving the battery rate performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for use in the embodiments.

[0017] Figure 1 This is a schematic structural diagram of a battery with negative electrode lead end face welding for reducing battery internal resistance provided by the utility model;

[0018] Figure 2 This is a schematic cross-sectional view of a battery with negative electrode lead end face welding for reducing battery internal resistance provided by the utility model;

[0019] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0020] Figure 4 for Figure 2 Schematic diagram of the enlarged portion B.

[0021] Description of the accompanying drawings: 10. Battery cell; 11. Positive electrode sheet; 12. Diaphragm; 13. Negative electrode sheet; 20. Positive electrode conductor; 30. Negative electrode conductor; 31. Internal welding point; 32. External welding point; 33. Opening; 34. Incision; 35. Taikai; 40. Negative electrode tab. DETAILED DESCRIPTION

[0022] In order to facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0023] A battery with negative electrode lead end face welding to reduce battery internal resistance, referring to Figure 1 and Figure 2 , including a hollow battery cell 10, a positive electrode conductor 20, and a negative electrode conductor 30. The battery cell 10 includes a positive electrode sheet 11, a separator 12, and a negative electrode sheet 13. The positive electrode sheet 11, separator 12, and negative electrode sheet 13 are stacked and wound in sequence to form a hollow wound battery cell 10. There are multiple positive electrode sheets 11, separators 12, and negative electrode sheets 13 in the battery cell 10. The separator 12 is disposed between the positive electrode sheet 11 and the negative electrode sheet 13. The innermost and outermost layers of the battery cell 10 are both separators 12, which are used to separate the positive electrode sheet 11 from the negative electrode sheet 13.

[0024] Further, refer to Figure 3 and Figure 4 The positive electrode conductor 20 and the negative electrode conductor 30 are respectively in contact with the positive terminal and the negative terminal of the battery cell 10, the positive electrode of the battery cell 10 faces the positive electrode conductor 20, and the negative electrode of the battery cell 10 faces the negative electrode conductor 30. The positive electrode conductor 20 and the negative electrode conductor 30 are respectively connected to the positive electrode and the negative electrode of the battery cell 10 to form a current flow channel.

[0025] Further, refer to Figure 1 and Figure 2 The battery cell 10 in this embodiment has a cylindrical structure, and the two ends of the cylinder are the positive electrode and the negative electrode of the battery cell 10 respectively. The two ends of the battery cell 10 are vertically connected to the positive electrode conductor 20 and the negative electrode conductor 30 respectively. The positive electrode conductor 20 and the negative electrode conductor 30 both have good conductivity and can conduct and collect current from the positive and negative electrodes of the battery cell 10.

[0026] Further, refer to Figure 1 and Figure 2 The positive electrode conductor 20 and the negative electrode conductor 30 are both made of conductive metal. The positive electrode conductor 20 can be an aluminum sheet or a nickel sheet, and the negative electrode conductor 30 can be a copper sheet, a tinned metal sheet or a nickel sheet.

[0027] Further, refer to Figure 1 and Figure 2In order to further increase the contact area between the positive electrode sheet 11 and the negative electrode sheet 13 and the positive electrode conductor 20 and the negative electrode conductor 30, the positive electrode conductor 20 and the negative electrode conductor 30 are both arranged in a disc shape.

[0028] Reference Figure 1 Since the area of ​​the tab leading out of the electrode in the prior art is small, which makes the internal resistance of the battery large, a welding assembly is provided on the negative electrode conductor 30 to increase the contact area.

[0029] Reference Figure 2 and Figure 3 A negative electrode tab 40 is welded to the end of the negative electrode sheet 13 in the battery cell 10 that faces the negative electrode conductor 30. The end of the negative electrode tab 40 that is away from the negative electrode sheet 13 is in contact with the end face of the negative electrode conductor 30 that faces the inside of the battery cell 10. A welding assembly is provided on the end face of the negative electrode conductor 30 that is located outside the battery cell 10. The welding assembly includes internal welding points 31 and external welding points 32. The internal welding points 31 and external welding points 32 are arranged in pairs. There are two pairs of internal welding points 31 and external welding points 32 on the negative electrode conductor 30. The two pairs of internal welding points 31 are symmetrically distributed, and the two pairs of external welding points 32 are symmetrically distributed. The two pairs of internal welding points 31 and the two pairs of external welding points 32 are staggered with each other.

[0030] Reference Figure 1 The internal welding points 31 and external welding points 32 are arranged in a rectangular shape. The internal welding points 31 and external welding points 32 are used to electrically connect to the negative electrode tab 40, thereby increasing the conductive area of ​​the battery cell 10, reducing the internal resistance, and improving the energy conversion rate of the battery. After the battery cell 10 is prepared, welding is performed using the internal welding points 31 and external welding points 32 on the negative electrode conductor 30. This increases the contact area and conductive area between the negative electrode conductor 30 and the battery cell 10, thereby reducing the internal resistance of the battery.

[0031] Further, refer to Figure 1 An opening 33 is provided between two adjacent pairs of internal welding points 31 and external welding points 32. The opening 33 extends through the upper and lower sides of the negative electrode conductor 30 and is arranged in a strip shape. An opening 33 is provided between each pair of adjacent internal welding points 31 and external welding points 32. Multiple openings 33 are evenly distributed along the circumference of the negative electrode conductor 30. The openings 33 are used for air convection to improve the heat dissipation effect of the negative electrode conductor 30, preventing excessive temperatures from affecting battery performance during welding and battery charging and discharging. Secondly, the openings can also prevent deformation of the negative electrode conductor 30 due to welding from affecting other parts of the negative electrode conductor 30, thereby improving deformation of the negative electrode conductor 30.

[0032] Further, refer to Figure 1, cutouts 34 are provided on the two opposite outer sides of the negative electrode conductor 30. The two cutouts 34 are arranged in parallel. The two cutouts 34 are respectively located on the two outer sides of the negative electrode conductor 30 to play a positioning role when the negative electrode conductor 30 is welded to the battery cell 10.

[0033] Further, refer to Figure 1 A platform 35 is provided at the center of the negative electrode conductor 30. The platform 35 can be used to cooperate with the platform at the bottom of the battery cup. The platform 35 of the negative electrode conductor 30 is in contact with or directly welded to the platform at the bottom of the battery cup.

[0034] The battery cell 10 of this battery connects the positive electrode sheet 11 and the negative electrode sheet 13 in the battery cell 10 by arranging a positive electrode conductor 20 and a negative electrode conductor 30 at both ends, and an internal welding point 31 and an external welding point 32 are provided on the negative electrode sheet 13. By welding, the contact area and conductive area between the negative electrode conductor 30 and the battery cell 10 are increased, thereby reducing the internal resistance of the battery and improving the battery rate performance. In addition, the base plate 35 in the middle part of the negative electrode conductor 30 can cooperate with the base plate at the bottom of the battery cup to form a contact connection or the negative electrode conductor 30 and the battery cup can be directly welded.

[0035] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person of ordinary skill in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A battery with negative electrode lead end face welding for reducing battery internal resistance, characterized in that: include: A hollow battery cell (10), a positive electrode conductor (20) and a negative electrode conductor (30), wherein the positive electrode conductor (20) and the negative electrode conductor (30) are respectively in contact with and conductive with the positive terminal and the negative terminal of the battery cell (10), and the negative electrode conductor (30) is provided with a welding assembly for increasing the contact area with the battery cell (10), and the welding assembly welds the battery cell (10) and the negative electrode conductor (30).

2. A battery with negative electrode lead end face welding for reducing battery internal resistance according to claim 1, characterized in that: The battery cell (10) comprises a positive electrode sheet (11), a separator (12) and a negative electrode sheet (13); the positive electrode sheet (11), the separator (12) and the negative electrode sheet (13) are sequentially stacked and wound to form the battery cell (10) with a hollow structure; the innermost layer and the outermost layer of the battery cell (10) are both the separator (12).

3. A battery with negative electrode lead end face welding for reducing battery internal resistance according to claim 2, characterized in that: A negative electrode tab (40) is welded to a section of the negative electrode sheet (13) in the battery cell (10) facing the negative electrode conductor (30), the negative electrode tab (40) is in contact with and connected to the negative electrode conductor (30), and the welding assembly is arranged on the end surface of the negative electrode conductor (30) located outside the battery cell (10).

4. A battery with negative electrode lead end face welding for reducing battery internal resistance according to claim 3, characterized in that: The welding assembly comprises internal welding points (31) and external welding points (32), the internal welding points (31) and the external welding points (32) are arranged in pairs, there are two pairs of the internal welding points (31) and the external welding points (32), the two pairs of the internal welding points (31) are symmetrically distributed, the two pairs of the external welding points (32) are symmetrically distributed, and the two pairs of the internal welding points (31) and the two pairs of the external welding points (32) are staggered.

5. A battery with negative electrode lead end face welding for reducing battery internal resistance according to claim 4, characterized in that: The internal welding point (31) and the external welding point (32) are both electrically connected to the negative electrode tab (40).

6. A battery with negative electrode lead end face welding for reducing battery internal resistance according to claim 5, characterized in that: An opening (33) is provided between two adjacent pairs of the internal welding points (31) and the external welding points (32), and the opening (33) passes through the upper and lower sides of the negative electrode conductor (30). The opening (33) is used for air convection to improve the heat dissipation effect of the negative electrode conductor (30) and to prevent the negative electrode conductor (30) from being deformed by welding and affecting other positions of the negative electrode conductor (30).

7. A battery with negative electrode lead end face welding for reducing battery internal resistance according to claim 6, characterized in that: Cutouts (34) are provided on two opposite outer sides of the negative electrode conductor (30), and the two cutouts (34) are arranged in parallel. The two cutouts (34) are used to achieve a positioning effect.

8. A battery with negative electrode lead end face welding for reducing battery internal resistance according to claim 1, characterized in that: The positive electrode conductor (20) and the negative electrode conductor (30) are both arranged in a disc shape.

9. A battery with negative electrode lead end face welding for reducing battery internal resistance according to claim 1, characterized in that: The positive electrode conductor (20) and the negative electrode conductor (30) are both made of conductive metal.

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