Battery module including sensing assembly and bus bar assembly

Patent metadata

Field	Value
Publication number	US-11830974-B2
Application number	US-201816621322-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Nov 16, 2017
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

A battery module includes: a cell stack defined by a plurality of battery cells each including a positive electrode lead, a negative electrode lead, and at least one of a sensing negative electrode lead and a sensing positive electrode lead; a bus bar assembly including a plurality of connection bus bars electrically connected to one of the positive and negative electrode leads, a plurality of sensing bus bars electrically connected to the sensing negative electrode lead or the sensing positive electrode lead, and a plurality of bus bar frames including a connection accommodating portion for receiving one of connection bus bars and a sensing accommodating portion for receiving one of sensing bus bars; and a sensing assembly including a sensing frame that receives a circuit board electrically connected to the plurality of connection bus bars and the plurality of sensing bus bars.

First claim

What is claimed is:

1. A battery module comprising:
a cell stack defined by a plurality of battery cells stacked on each other, each of the battery cells including a positive electrode lead, a negative electrode lead, and at least one of a sensing negative electrode lead and a sensing positive electrode lead;
a bus bar assembly comprising a plurality of connection bus bars, a plurality of sensing bus bars, and a plurality of bus bar frames, each of the bus bar frames including a connection accommodating portion for receiving one of the connection bus bars and a sensing accommodating portion for receiving one of the sensing bus bars, each of the connection bus bars being electrically connected to one of the positive electrode lead and the negative electrode lead of a respective one of the plurality of battery cells, and each of the plurality of sensing bus bars being electrically connected to the sensing negative electrode lead or the sensing positive electrode lead of a respective one of the plurality of battery cells; and
a sensing assembly comprising a circuit board and a sensing frame mounted on a front surface of the bus bar assembly and receiving the circuit board therein in a board embedding portion, the circuit board being electrically connected to the plurality of connection bus bars and the plurality of sensing bus bars of the bus bar assembly.

2. The battery module of claim 1 , wherein each of the positive electrode leads is provided at one end portion of a respective one of the plurality of battery cells, and each of the negative electrode leads is provided at the other end portion of the respective one of the plurality of battery cells, and
wherein each of the sensing negative electrode leads is provided at the one end portion of a respective one of the plurality of battery cells at a predetermined distance from the respective positive electrode lead, and each of the sensing positive electrode leads is provided at the other end portion of the respective one of the plurality of battery cells at a predetermined distance from the respective negative electrode lead.

3. The battery module of claim 2 , wherein the connection accommodating portion and the sensing accommodating portion of each of the bus bar frames are formed at one side surface of a respective one of the plurality of bus bar frames,
the connection accommodating portions each having a recessed structure such that one of the plurality of connection bus bars is received therein, and the sensing accommodating portions each having a recessed structure such that one of the plurality of sensing bus bars is received therein, and
wherein a partition wall is provided between the connection accommodating portion and the sensing accommodating portion of each of the bus bar frames to partition the respective connection accommodating portion from the respective sensing accommodating portion.

4. The battery module of claim 3 , wherein at least a portion of the one side surface of each of the bus bar frames is accommodated on a terrace portion of a respective one of the battery cells.

5. The battery module of claim 4 , wherein the plurality of bus bar frames are stacked on each other in a stack direction of the plurality of battery cells, and
a connection plate configured to electrically connect the plurality of connection bus bars to each other is fixed to a front surface of each of the plurality of connection bus bars.

6. The battery module of claim 1 , wherein the sensing frame comprises a plurality of insertion grooves configured such that at least a portion of each of the connection bus bars and the sensing bus bars are received within a respective one of the insertion grooves.

7. The battery module of claim 6 , wherein the sensing assembly further comprises a plurality of sensing terminals positioned in the respective insertion grooves, each sensing terminal having one end electrically connected to the circuit board and the other end electrically connected to one of the connection bus bars or the sensing bus bars.

8. The battery module of claim 7 , wherein each of the sensing terminals has a shape of an elongated plate extending in an inward direction from the circuit board, and
each of the sensing terminals has an elastically deformable curved portion at an end portion of the respective sensing terminal in the inward direction.

9. The battery module of claim 7 , wherein the sensing frame comprises a plurality of connection protruding portions protruding in the inward direction for supporting the sensing terminal in a horizontal direction, and
wherein each of the plurality of bus bar frames comprises an insertion portion configured to receive a respective one of the connection protruding portions.

10. The battery module of claim 1 , wherein the connection accommodating portion of each of the bus bar frames comprises a connection pressurizing portion pressurizing a rear side of a respective one of the plurality of connection bus bars such that a front end portion of the respective connection bus bar protrudes outside the connection accommodating portion, and
wherein the sensing accommodating portion of each of the bus bar frames comprises a sensing pressurizing portion pressurizing a rear side of a respective one of the plurality of sensing bus bars such that a front end portion of the respective sensing bus bar protrudes outside the sensing accommodating portion.

11. The battery module of claim 10 , wherein the connection pressurizing portion of each of the bus bar frames comprises a connection support elongated at an oblique angle from a corner of the respective connection accommodating portion, an end portion of the connection support in an elongated direction elastically pressurizing the rear side of the respective connection bus bar, and
wherein the sensing pressurizing portion of each of the bus bar frames comprises a sensing support elongated at an oblique angle from a corner of the respective sensing accommodating portion, an end portion of the sensing support in an elongated direction elastically pressurizing the rear side of the respective sensing bus bar.

12. The battery module of claim 10 , further comprising a stopper at the connection accommodating portion of each of the bus bar frames for blocking a respective one of the connection bus bars from moving forward, and
a stopper at the sensing accommodating portion of each of the bus bar frames for blocking a respective one of the sensing bus bars from moving forward.

13. The battery module of claim 10 , further comprising a bump at the connection accommodating portion of each of the bus bar frames for preventing a respective one of the connection bus bars from being displaced in a horizontal direction, and
a bump at the sensing accommodating portion of each of the bus bar frames for preventing a respective one of the sensing bus bars from being displaced in the horizontal direction.

14. A battery pack comprising at least one battery module according to claim 1 .

15. A vehicle comprising the battery pack according to claim 14 .

16. The battery module of claim 1 , wherein the plurality of bus bar frames includes a respective bus bar frame for each of the battery cells in the cell stack.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Jin Hee-Jun
• Seo Sung-Won
• Lee Yoon-Koo
• Ju Eun-Ah
• Chi Ho-June
• Mun Jeong-O

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title

• H01M10/48 Primary

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H01M10/482 Primary

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M50/211

  adapted for pouch cells · CPC title