Patent ID: 12249737

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The following description is of the best presently contemplated mode of carrying out the present disclosure. This description is not to be taken in a limiting sense but is made merely for the purpose of describing the general principles of the invention. The scope of the invention should be determined by referencing the appended claims.

FIG.1is a schematic cross-sectional side view showing a lithium battery cell, andFIG.2toFIGS.7A and7Billustrate manufacturing processes of a lithium battery cell manufacturing method. Referring toFIG.1, a lithium battery cell100includes an upper cover module110, a first battery electrode group120, a second battery electrode group130and a plurality of first electrode connection straps140. The upper cover module110includes a first electrode terminal111, an upper covering plate114, an upper insulation ring112and a lower insulation ring116.

The upper insulation ring112is disposed on the upper covering plate114, and the lower insulation ring116is disposed under the upper covering plate114. The upper insulation ring112and the lower insulation ring116fix the first electrode terminal111in the upper covering plate114to electrically isolate the first electrode terminal111from the upper covering plate114.

In addition, the first battery electrode group120includes a first tab122, and the second battery electrode group130includes a second tab132. The first tab122and the second tab132are electrically connected to the first electrode connection straps140. It is worth noting that a plurality of first electrode connection straps140are stacked together and have the same width and length. The figure shows the first electrode connection straps140formed a stacked type. That is to say, a plurality of first electrode connection straps140have approximately the same area or a plurality of first electrode connection straps140have the same resistance so as to allow the two battery electrode groups connected to the electrode terminal have the same resistance, thereby smoothly and stably outputting a power by the lithium battery cell100.

The first electrode connection straps140include a first end142, a second end144and a middle part146disposed between the first and second ends142,144. The first end142of the first electrode connection straps140is welded to the first tab122, and the second end144of the first electrode connection straps140is welded to the second tab132. The middle part146of the first electrode connection straps140is welded to the first electrode terminal111. Therefore, the first tab122and the second tab132can electrically connect to the first electrode terminal111by the first electrode connection straps140.

Furthermore, at the path from the middle part146to the first end142, the first electrode connection straps140includes an even number of first bending parts, for example, a first bending part161and a first bending part162. In addition, at the path from the middle part146to the second end144, the first electrode connection straps140includes an even number of second bending parts, for example, a second bending part163and a second bending part164, the first bending part161and the second bending part163are symmetrical to each other, and the first bending part162and the second bending part164are symmetrical to each other.

In some embodiments, the first bending part161is a first U-shaped bending part, and the first bending part162is a second U-shaped bending part, the first U-shaped bending part is disposed near the first tab122, the second U-shaped bending part is connected to the first U-shaped bending part, and the first U-shaped bending part is arranged opposite to the second U-shaped bending part. The electrical connection of first electrode connection straps140, from the first end142to the middle part146, passes the two first bending parts161,162.

In some embodiments, the second bending part163is another one first U-shaped bending part, and the second bending part164is another one second U-shaped bending part, the another one first U-shaped bending part is disposed on both sides of the second tab132, the another one second U-shaped bending part is connected to the another one first U-shaped bending part, and the another one first U-shaped bending part is arranged opposite to the another one second U-shaped bending part. The electrical connection of first electrode connection straps140, from the second end144to the middle part146, passes the two second bending parts163,164.

In some embodiments, the first electrode terminal111is a positive electrode terminal or a negative electrode terminal.

In some embodiments, when the first electrode terminal111is a positive electrode terminal, the first electrode connection straps140shows a stack with a plurality of aluminum electrode connection straps. In addition, the first electrode terminal111is an aluminum electrode terminal.

In some embodiments, when the first electrode terminal111is a negative electrode terminal, the first electrode connection straps140comprise a plurality of copper electrode connection straps. In addition, the first electrode terminal111is a copper electrode terminal.

In some embodiments, the lithium battery cell100further comprises a housing150, be fixed to the upper covering plate114of the upper cover module110, to seal the first battery electrode group120and the second battery electrode group130.

In some embodiments, the housing150is a metal housing, for example, an aluminum housing, to be fixed to the upper covering plate114of the upper cover module110by laser welding.

Further referring toFIG.2toFIGS.7A and7B, a lithium battery cell manufacturing method is disclosed. First, as shown inFIG.2, a plurality of first electrode connection straps140are provided and stacked together. The first electrode connection straps140have the same width and length, and the first electrode connection straps140include a first end142, a second end144and a middle part146. The first electrode connection straps140can have the same resistance value since the first electrode connection straps140having the same width and length, i.e. a same area, and stacking together.

Furthermore, in the lithium battery cell manufacturing method, a first battery electrode group120and a second battery electrode group130are provided, the first battery electrode group120includes a first tab122extending from electrode sheets of the first battery electrode group120, and the second battery electrode group130includes a second tab132extending from electrode sheets of the second battery electrode group130.

The first battery electrode group120further includes a third tab222, and the second battery electrode group130further includes a fourth tab232. In addition, a plurality of second electrode connection straps240are stacked together. The second electrode connection straps240have the same width and length, and the second electrode connection straps240include a first end242, a second end244and a middle part246. When the first electrode connection straps140are positive, the second electrode connection straps240are negative. When the first electrode connection straps140are negative, the second electrode connection straps240are positive. The following description mainly focuses on the manufacturing process of the first electrode connection straps140, while a part of the description is supplemented by the manufacturing process of the second electrode connection straps240.

In some embodiments, the first battery electrode group120is formed by alternately stacking a plurality of aluminum electrode sheets and copper electrode sheets, and the second battery electrode group130is formed by a similar structure. When the first electrode terminal111is positive, a plurality of aluminum electrode sheets of the first battery electrode group120and the second battery electrode group130respectively stack and extend to form the first tab122and the second tab132, and a plurality of copper electrode sheets of the first battery electrode group120and the second battery electrode group130respectively stack and extend to form the third tab222and the fourth tab232.

Referring toFIGS.2and3, the first end142of first electrode connection straps140is welded to the first tab122, and the second end144of the first electrode connection straps140is welded to the second tab132. Meanwhile, the first end242of the second electrode connection straps240is welded to the third tab222, and the second end244of the second electrode connection straps240is welded to the fourth tab232.

In some embodiments, the lithium battery cell manufacturing method further utilizes an ultrasonic welding to weld the first end142of first electrode connection straps140on the first tab122, and to weld the second end144of the first electrode connection straps140on the second tab132. Meanwhile, the lithium battery cell manufacturing method further utilizes an ultrasonic welding to weld the first end of242of the second electrode connection straps240on the third tab222, and to weld the second end244of the second electrode connection straps240on the fourth tab232. In addition, an upper cover module110is further provided, and the upper cover module110includes a first electrode terminal111and a second electrode terminal211.

Referring toFIGS.3and4, the middle part146of the first electrode connection straps140is welded to the first electrode terminal111, and the middle part246of the second electrode connection straps240is welded to the second electrode terminal211. Therefore, the upper cover module110is approximately located between the first battery electrode group120and the second battery electrode group130. In some embodiments, the length, from the first electrode terminal111to the first tab122, of the first electrode connection straps140approximately equals to the length, from the first electrode terminal111to the second tab132, of the first electrode connection straps140. In addition, the length, from the second electrode terminal211to the third tab222, of the second electrode connection straps240approximately equals to the length, from the second electrode terminal211to the fourth tab232, of second electrode connection straps240.

In some embodiments, the lithium battery cell manufacturing method utilizes a laser welding to weld the middle part146of the first electrode connection straps140on the first electrode terminal111, and the middle part246of the second electrode connection straps240on the second electrode terminal211.

Continuously referring toFIGS.4and5, along the arrow direction510and the arrow direction520, the first electrode connection straps140, from the middle part146to the first end142, and the first electrode connection straps140, from the middle part146to the second end144, are symmetrically bent as a center on the first electrode terminal111. Similarly, along the arrow direction510and the arrow direction520, the second electrode connection straps240are symmetrically bent as a center on the second terminal211. A lithium battery cell structure with the forementioned bended electrode connection straps is shown inFIG.5.

Continuously referring toFIGS.6A and6B,FIG.6Ais a perspective diagram showing a semi-finished structure of the lithium battery cell andFIG.6Bis a side view thereof. As shown InFIG.6B, the second electrode terminal211and the first electrode terminal111are overlapped through the visual line. As shown inFIGS.6A and6B, along the arrow direction710, the first electrode connection straps140are bent between the middle part146and the first end142. Similarly, along the arrow direction720, the first electrode connection straps140are bent between the middle part146and the second end144. The first electrode connection straps140are symmetry fold based on the middle part146as a center. Meanwhile, along the arrow direction710and the arrow direction720, the second electrode connection straps240are also bent to formed a symmetry fold the second electrode connection straps240.

Referring toFIGS.7A and7B, the folded first electrode connection straps140, from the middle part146to the first end142, include an even number of first bending parts, for example, the first bending part161and the first bending part162, and the first electrode connection straps140, form the middle part146to the second end144, includes an even number of second bending parts, for example, the second bending part163and the second bending part164. The first bending part161and the second bending part163are symmetrical to each other, and the first bending part162and the second bending part164are symmetrical to each other.

In some embodiments, the lithium battery cell manufacturing method further includes the step of laser welding the upper covering plate114on the housing150to seal the first battery electrode group120and the second battery electrode group130so as to form the lithium battery cell100as illustrated inFIG.1. The housing150is a metal housing, for example, an aluminum housing, to weld to the upper covering plate114of the upper cover module110by laser welding. Through twice bending processes, the electrode connection straps140can be disposed on both sides of the first tab122. In addition, the required lengths of both sides of the first electrode connection straps140are the same through twice bending processes so that the wrinkle on the electrode connection straps can be avoided and the production quality of the lithium battery cell is improved.

Accordingly, the lithium battery cell and manufacturing method thereof can effectively avoid the wrinkle formed on the electrode connection straps, reduce the amount of material of the electrode connection belt, reduce the material inventory in the storage, simplify the manufacturing process and improve the production quality of the lithium battery.

As is understood by a person skilled in the art, the foregoing preferred embodiments of the present invention are illustrative of the present invention rather than limiting of the present invention. It is intended that various modifications and similar arrangements be included within the spirit and scope of the appended claims, the scope of which should be accorded the broadest interpretation so as to encompass all such modifications and similar structures.