JPWO2021073200A5

JPWO2021073200A5 -

Info

Publication number: JPWO2021073200A5
Application number: JP2022520899A
Authority: JP
Publication date: 2023-02-28
Anticipated expiration: 2040-07-30

Claims

an electrode unit including a main body and first and second tabs extending from the main body;
a case having a housing cavity that houses the main body and a first opening that communicates with the housing cavity;
The first tab covers the first opening and has a first clearance hole therethrough, and the first tab is welded through the first clearance hole on a side away from the receiving cavity. a first cover plate;
a sealing plate sealingly connected to a side of the first cover plate remote from the receiving cavity and covering the first escape hole;
including
An outer surface of the first cover plate away from the housing cavity is recessed into the housing cavity to form a first recess having a bottom plate, and the first escape hole is the bottom plate. Located on one side along the thickness direction of the secondary battery,
The first tab has a connecting portion and a fixing portion, the fixing portion is located in the first recess and is connected to the bottom plate, and the connecting portion is connected to the fixing portion. provided by bending against, and drilled in the first relief hole,
The secondary battery, wherein the first cover plate has an inner surface facing the housing cavity, and the bottom plate protrudes from the inner surface in a direction toward the housing cavity.

The number of the first relief holes is two, and the two first relief holes are located on both sides along the thickness direction of the bottom plate,
The number of the electrode units is two, the two electrode units are arranged side by side along the thickness direction, and the first tabs of each of the two electrode units 2. The secondary battery according to claim 1 , wherein the fixing portions of the two first tabs are passed through the two first escape holes and are stretched along a direction in which the two first tabs approach each other.

The first recess has a first segment and a second segment continuously distributed in the height direction of the secondary battery, and the first segment accommodates the second segment. located on the side away from the cavity, and the orthographic projection of the second segment in the height direction is located within the orthographic projection of the first segment in the height direction,
3. The secondary battery according to claim 1, wherein at least part of said fixing portion is accommodated in said second segment, and said sealing plate is accommodated in said first segment.

The first recess has a first side wall facing the first segment, a second side wall facing the second segment, and a transition section, and the first side wall and the second side wall 4. The secondary battery according to claim 3 , wherein the sidewalls are connected to each other through the transition portion, and the sealing plate is positioned on the side of the transition portion away from the accommodation cavity.

The edge of the sealing plate has a welding area, and a reinforcing bar is provided on the inner surface of the first cover plate facing the receiving cavity, and the reinforcing bar is positive in the height direction of the electrode unit. 5. The secondary battery according to claim 3 , wherein the projection covers the orthographic projection of the welding area in the height direction.

Further comprising a partition plate, the partition plate being positioned between the first cover plate and the main body portion, the partition plate being provided with a second relief hole penetrating therethrough, The secondary battery according to any one of claims 1 to 5 , wherein the first tab is passed through the first escape hole and the second escape hole.

7. The secondary battery according to claim 6 , wherein orthographic projections of said second escape hole and said first escape hole in the height direction of said electrode unit at least partially overlap.

The partition plate has a first surface facing the first cover plate and a second surface facing the main body, and the first surface is recessed into the second surface, 8. The secondary battery according to claim 6 , wherein a second recess is formed, and at least a portion of said bottom plate is positioned within said second recess.

a first electrode terminal electrically connected to the first tab; and a second electrode terminal electrically connected to the second tab, the first electrode terminal comprising: Electrically connected to said first cover plate and said case, said second electrode terminal being provided insulated from said first cover plate and said case, according to any one of claims 1 to 8 The secondary battery according to any one of items.

Further comprising a second cover plate, the case has a second opening communicating with the receiving cavity, and the second opening and the first opening respectively correspond to the secondary openings of the case. The second cover plate covers the second opening, and the first electrode terminal and the second electrode terminal are located at both ends along the height direction of the battery. is also provided on the second cover plate, and the first tab is electrically connected to the first electrode terminal through the first cover plate, the case, and the second cover plate in order. 10. The secondary battery according to claim 9 , wherein said second tab is provided insulated from said second cover plate.

A method for manufacturing a secondary battery according to any one of claims 1 to 10,
The electrode unit including a main body and first and second tabs extending from the main body is provided in a housing cavity of a case, and the first tab communicates with the housing cavity of the case. an electrode unit assembly step toward the first opening that
A first cover plate having a first relief hole therethrough covers the first opening, the first tab extends through the first relief hole, and the first tab of the first cover plate extends through the first relief hole. a first cover plate covering step of welding on the side facing away from the receiving cavity;
a sealing step of sealingly connecting a sealing plate to a side of the first cover plate remote from the receiving cavity and covering the first escape hole with the sealing plate;
including
Prior to said first cover plate covering step, further comprising:
Stamping the first cover plate forms a first recess having a bottom plate in the surface of the first cover plate, the bottom plate extending from the first cover plate in a direction toward the receiving cavity. provided protruding from an inner surface facing the housing cavity, and the first escape hole is located on one side of the bottom plate along the thickness direction of the secondary battery,
The first cover plate covering step further includes covering the first cover plate over the first opening and forming the first recess on the side of the first cover plate away from the receiving cavity. a first tab having a connecting portion and a fixing portion is passed through the first relief hole, the connecting portion is bored in the first relief hole, and the fixing portion is attached to the connecting portion A manufacturing method including bending the fixing portion against the first recess to provide the fixing portion in the first recess, and connecting the fixing portion to the bottom plate.

Prior to said first cover plate covering step, further comprising:
covering the first opening with a partition having a second relief hole therethrough, and passing the first tab through the second relief hole;
In the first cover plate covering step, the partition plate is further covered with a first cover plate, and the first tab is passed through the second escape hole and the first escape hole in order. The manufacturing method of the secondary battery according to claim 11 , comprising: