Battery Module and Assembling Method of the Same

Patent metadata

Field	Value
Publication number	US-2024250395-A1
Application number	US-202418418523-A
Country	US
Kind code	A1
Filing date	Jan 22, 2024
Priority date	Jan 25, 2023
Publication date	Jul 25, 2024
Grant date	—

Abstract

The present disclosure relates to a battery module and an assembling method of the same including: a cell assembly including a plurality of battery cells and a busbar assembly for electrically connecting the plurality of battery cells; a case forming a cell accommodating space for accommodating the cell assembly therein; and a filler portion provided between the plurality of battery cells and the busbar assembly inside the case and including a flame-retardant material.

First claim

What is claimed is:

1 . A battery module comprising:
a cell assembly including a plurality of battery cells and a busbar assembly for electrically connecting the plurality of battery cells; a case defining a cell accommodating space for accommodating the cell assembly therein; and a filler portion provided between the plurality of battery cells and the busbar assembly inside the case and including a flame-retardant material.

2 . The battery module according to claim 1 , wherein the plurality of battery cells each include: a cell body portion generating or storing electrical energy; and a tab portion protruding from the cell body portion toward the busbar assembly and electrically connecting the cell body portion and the bus bar assembly, and
wherein the filler portion is positioned in a filler space defined between one side face of the cell body portion from which the tab portion protrudes and the busbar assembly.

3 . The battery module according to claim 2 , wherein the tab portion includes a first tab and a second tab protruding from the cell body portion toward the busbar assembly along any one direction among directions perpendicular to the height direction of the case,
wherein the busbar assembly includes: a first busbar electrically connected to the first tab and a first busbar frame supporting the first busbar; and a second busbar electrically connected to the second tab and a second busbar frame supporting the second busbar, and wherein the filler space includes: a first filler space provided between a part in which the first tab is positioned and the first busbar frame; and a second filler space provided between a part in which the second tab is positioned and the second busbar frame.

4 . The battery module according to claim 3 , wherein, along a direction from the first filler space to the second filler space, the length of the first filler space is different from the length of the second filler space.

5 . The battery module according to claim 3 , further comprising: a heat dissipating portion positioned between the cell assembly and a bottom face of the cell accommodating space to dissipate heat generated from the plurality of battery cells to the outside through the case, wherein the heat dissipating portion is positioned between the first filler space and the second filler space.

6 . The battery module according to claim 2 , wherein the filler portion is formed of a polymer material that is cured after being injected into the filler space.

7 . The battery module according to claim 2 , wherein the filler portion is filled in the filler space in a liquid form.

8 . The battery module according to claim 2 , wherein the filler portion includes:
a body portion including an insertion groove extending along the height direction of the case to insert the tab portion and electrically connect the tab portion to the bus bar assembly; and a connecting portion extending in a direction from one side of the body portion toward the busbar assembly.

9 . The battery module according to claim 3 , further comprising: a first insulation cover positioned in a direction from the outside of the first busbar frame to one side face of the case which is positioned closer to the first busbar frame, among both side faces facing the first busbar frame, to insulate between the first busbar and the case; and a second insulation cover positioned in a direction from the second busbar frame to the other face of the case to insulate between the second busbar and the case.

10 . The battery module according to claim 9 , wherein the cell assembly further includes a first end plate and a second end plate respectively connected to the first insulation cover and the second insulation cover to surround the plurality of battery cells.

11 . The battery module according to claim 10 , further comprising: a module cover coupled to the first insulation cover, the second insulation cover, the first end plate, and the second end plate.

12 . The battery module according to claim 1 , wherein, based on a bottom face of the cell accommodating space, the maximum height of the filler portion is more than half of the maximum height of the plurality of battery cells positioned in the cell accommodating space.

13 . The battery module according to claim 1 , wherein the case includes: a module body including an opening portion in an upper portion thereof, extending along a first direction, which is any one direction among directions perpendicular to the height direction of the case, and formed in a U-shape of which both side faces perpendicular to the first direction are open;
and a module cover coupled to the module body to close the opening portion.

14 . The battery module according to claim 13 , further comprising: a heat dissipating portion positioned between the cell assembly and a bottom face of the cell accommodating space to dissipate heat generated from the plurality of battery cells to the outside through the case.

15 . The battery module according to claim 1 , wherein the filler portion further includes a heat-resistant material.

16 . A method of assembling a battery module comprising a cell assembly including a plurality of battery cells and a busbar assembly for electrically connecting the plurality of battery cells; and a case defining a cell accommodating space for accommodating the cell assembly therein, the method comprising:
a step of coupling a module cover coupled with one face of the case with the cell assembly; a step of inverting the cell assembly coupled with the module cover; and a step of forming a filler portion between the busbar assembly and the plurality of battery cells .

17 . The method of assembling a battery module according to claim 16 , wherein in the step of forming a filler portion, the filler portion is moved toward the inverted cell assembly to face an inner side of the bus bar assembly.

18 . The method of assembling a battery module according to claim 16 , wherein, in the step of forming a filler portion, the filler portion in a liquid state is injected to be filled between the plurality of battery cells and the bus bar assembly.

19 . The method of assembling a battery module according to claim 17 , further comprising: a step of coupling a module body defining the cell accommodating space together with the module cover with the module cover, after forming of the filler portion.

20 . The method of assembling a battery module according to claim 19 , further comprising: a step of re-inverting the module body after coupling the module body to the module cover.

Assignees

• Sk On Co Ltd

Inventors

• Lee Gang U
• Noh Yun Joo

Classifications

• H01M50/572

  Means for preventing undesired use or discharge · CPC title

• H01M10/0404

  Machines for assembling batteries · CPC title

• H01M50/293

  characterised by the material · CPC title

• H01M50/244

  Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method · CPC title

• H01M50/507 Primary

  comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules · CPC title