US-20260128400-A1 - POWER STORAGE DEVICE

US20260128400A1US 20260128400 A1US20260128400 A1US 20260128400A1US-20260128400-A1

Abstract

A temperature detection unit includes a first temperature detection portion disposed on a first direction side with respect to a module center, and a second temperature detection portion disposed on a second direction side with respect to the module center. A first detection connector is electrically connected to the first temperature detection portion and is disposed on the first direction side with respect to a module main body. A second detection connector is electrically connected to a second temperature detection portion and is disposed on the second direction side with respect to the module main body.

Inventors

Keisuke SAKASHITA

Assignees

TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date: 20260507
Application Date: 20251021
Priority Date: 20241105

Claims (5)

1 . A power storage device comprising: a cell module including a plurality of power storage cells arranged in an arrangement direction; a bus bar module electrically connected to the cell module; a temperature detection unit; and at least one detection module electrically connected to the temperature detection unit and disposed on one end side of the cell module in the arrangement direction, wherein when it is defined that a direction intersecting the arrangement direction is an intersecting direction, one direction of the intersecting direction is a first direction, and the other direction of the intersecting direction is a second direction, the bus bar module includes a plurality of first bus bars disposed on the first direction side with respect to a module center located at a center of the cell module in the intersecting direction, and a plurality of second bus bars disposed on the second direction side with respect to the module center, the temperature detection unit includes a first temperature detection portion disposed on the first direction side with respect to the module center, the first temperature detection portion being able to detect a temperature of at least one of the plurality of first bus bars, and a second temperature detection portion disposed on the second direction side with respect to the module center, the second temperature detection portion being able to detect a temperature of at least one of the plurality of second bus bars, the detection module includes a module main body, and a first detection connector and a second detection connector each connected to the module main body, the first detection connector is electrically connected to the first temperature detection portion and is disposed on the first direction side with respect to the module main body, and the second detection connector is electrically connected to the second temperature detection portion and is disposed on the second direction side with respect to the module main body.
2 . The power storage device according to claim 1 , wherein the module main body is disposed at a position overlapping the cell module in the arrangement direction.
3 . The power storage device according to claim 1 , wherein the at least one detection module includes a first detection module disposed on one side with respect to the cell module in the arrangement direction, and a second detection module disposed on the other side with respect to the cell module in the arrangement direction, the first detection connector of the first detection module is electrically connected to the first temperature detection portion disposed on the one side with respect to a predetermined position in the arrangement direction, the second detection connector of the first detection module is electrically connected to the second temperature detection portion disposed on the one side with respect to the predetermined position in the arrangement direction, the first detection connector of the second detection module is electrically connected to the first temperature detection portion disposed on the other side with respect to the predetermined position in the arrangement direction, and the second detection connector of the second detection module is electrically connected to the second temperature detection portion disposed on the other side with respect to the predetermined position in the arrangement direction.
4 . The power storage device according to claim 1 , wherein the bus bar module includes a first bus bar connector connected to the first detection connector, a first printed board on which a first wiring that electrically connects the first bus bars and the first bus bar connector is formed, a second bus bar connector connected to the second detection connector, and a second printed board on which a second wiring that electrically connects the second bus bars and the second bus bar connector is formed, the cell module includes a first side surface on the first direction side in the intersecting direction, and a second side surface on the second direction side in the intersecting direction, the first printed board is disposed at a position facing the first side surface, and the second printed board is disposed at a position facing the second side surface.
5 . The power storage device according to claim 1 , wherein the first detection connector includes a first detection pin for temperature detection, the second detection connector includes a second detection pin for temperature detection, and each of the number of the first detection pins and the number of the second detection pins is equal to or greater than a sum of the number of the first bus bars for each of which a temperature is detected by the first temperature detection portion and the number of the second bus bars for each of which a temperature is detected by the second temperature detection portion.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This nonprovisional application is based on Japanese Patent Application No. 2024-193692 filed on November 5, 2024 with the Japan Patent Office, the entire contents of which are hereby incorporated by reference. BACKGROUND Field The present disclosure relates to a power storage device. Description of the Background Art Japanese Patent Laying-Open No. 2024-085194 discloses a secondary battery in which a plurality of battery cells are arranged. The secondary battery includes a bus bar that connects positive electrodes at one end of each battery cell and negative electrodes at the other end of each battery cell. A temperature detection portion, which is a sensor for detecting the temperature of the bus bar, is disposed in the bus bar. A signal from the temperature detection portion disposed in each bus bar is transmitted to a connector provided outside the flexible substrate through the flexible substrate. SUMMARY In the secondary battery (power storage device) described in Japanese Patent Laying-Open No. 2024-085194, the signal is transmitted to the connector from the temperature detection portion disposed in the bus bar at each of the both ends of the battery cell (power storage cell) as described above. For example, when (the pin of) the connector is disposed to face the one end side, it is considered to be difficult to electrically connect the temperature detection portion on the other end side to the connector. Specifically, in order to electrically connect the temperature detection portion on the other end side and the connector by a flexible substrate, the flexible substrate needs to be rounded to reach the one end side. Thus, it is considered that the secondary battery becomes large. The present disclosure has been made to solve the above-described problem, and an object of the present disclosure is to provide a power storage device so as to readily electrically connect a detection module disposed on one end side of a cell module in an arrangement direction of power storage cells and temperature detection portions on both sides in an intersecting direction intersecting the arrangement direction when the temperature detection portions are provided on the both sides. A power storage device according to one aspect of the present disclosure includes: a cell module including a plurality of power storage cells arranged in an arrangement direction; a bus bar module electrically connected to the cell module; a temperature detection unit; and at least one detection module electrically connected to the temperature detection unit and disposed on one end side of the cell module in the arrangement direction. When it is defined that a direction intersecting the arrangement direction is an intersecting direction, one direction of the intersecting direction is a first direction, and the other direction of the intersecting direction is a second direction, the bus bar module includes a plurality of first bus bars disposed on the first direction side with respect to a module center located at a center of the cell module in the intersecting direction, and a plurality of second bus bars disposed on the second direction side with respect to the module center. The temperature detection unit includes a first temperature detection portion disposed on the first direction side with respect to the module center, the first temperature detection portion being able to detect a temperature of at least one of the plurality of first bus bars, and a second temperature detection portion disposed on the second direction side with respect to the module center, the second temperature detection portion being able to detect a temperature of at least one of the plurality of second bus bars. The detection module includes a module main body, and a first detection connector and a second detection connector each connected to the module main body. The first detection connector is electrically connected to the first temperature detection portion and is disposed on the first direction side with respect to the module main body. The second detection connector is electrically connected to the second temperature detection portion and is disposed on the second direction side with respect to the module main body. The foregoing and other objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description of the present disclosure when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a configuration of a power storage device according to the present embodiment. FIG. 2 is a plan view showing a detailed configuration of the power storage device. FIG. 3 is a partially enlarged view showing a cell module and a detection module of FIG. 2. FIG. 4 is a partially enlarged view showing a configuration in the vicinity of a detection module shown in FIG. 2. FIG. 5 is a diagram showing a pin a