CN-115395127-B - Battery cell

CN115395127BCN 115395127 BCN115395127 BCN 115395127BCN-115395127-B

Abstract

The invention provides a battery unit, which is provided with a battery module formed by stacking a plurality of electrode plates along a first direction, and a cooling plate overlapped on the surface of the battery module. The electrode sheet has a coated portion in which an active material is present on at least one surface, and an uncoated portion adjacent to the coated portion and in which no active material is present on both surfaces. The cooling plate has a main body plate that faces the coating portion and cools the battery module, and at least one sensor holder that is mounted along the outer edge of the main body plate and holds a sensor that detects information related to the battery module. In the battery cell, the boundary between the coated portion and the uncoated portion of the electrode sheet and the boundary between the main body plate and the sensor holder in the contact surface of the cooling plate do not overlap in a section extending parallel to each other when viewed in the first direction.

Inventors

NOBUYOSHI FUJIWARA
Fu Tianzi
UEDA HIROO

Assignees

丰田自动车株式会社
株式会社丰田自动织机

Dates

Publication Date: 20260505
Application Date: 20220329
Priority Date: 20210525

Claims (10)

1. A battery cell, comprising: a battery module formed by stacking a plurality of electrode sheets along a first direction, and A cooling plate that is disposed on the surface of the battery module in an overlapping manner, The electrode sheet has a coated portion in which an active material is present on at least one surface, and an uncoated portion adjacent to the coated portion and having two surfaces in which the active material is not present, The cooling plate has a main body plate facing the coating portion and configured to cool the battery module, and at least one sensor holder mounted along an outer edge of the main body plate and configured to hold a sensor that detects information related to the battery module, The abutment surface of the cooling plate against the battery module includes an interface of the body plate and the sensor bracket, When viewed in the first direction, a boundary between the coated portion and the uncoated portion of the electrode sheet and a boundary between the main body plate and the sensor holder in the contact surface of the cooling plate do not overlap in a section extending parallel to each other between the boundary between the coated portion and the uncoated portion and the boundary between the main body plate and the sensor holder.
2. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, At least a part of a boundary between the body plate and the sensor mount in the contact surface is located on the coating portion of the electrode sheet when viewed in the first direction.
3. The battery cell according to claim 1 or 2, wherein, The sensor mount has a first sensor mount mounted along an outer edge of a first side of the body plate and a second sensor mount mounted along an outer edge of a second side of the body plate opposite the outer edge of the first side.
4. The battery cell of claim 3, wherein the battery cell comprises a plurality of cells, A first sensor is held on the first sensor holder, the first sensor detects first information related to the battery module, A second sensor is retained on the second sensor mount, the second sensor detecting second information related to the battery module and different from the first information.
5. The battery cell of claim 4, wherein the battery cell comprises a plurality of cells, The first sensor is a temperature sensor that detects a temperature of the battery module.
6. The battery cell according to claim 4 or 5, wherein, The second sensor is a voltage sensor that detects a voltage of the battery module.
7. The battery cell according to claim 1 or 2, wherein, The main body plate is made of metal, The sensor holder is made of resin.
8. The battery cell according to claim 1 or 2, wherein, The battery module and the cooling plate are provided in plurality, The battery modules and the cooling plates are alternately laminated along the first direction.
9. The battery cell of claim 8, wherein the battery cell comprises a plurality of cells, At least one of the plurality of cooling plates has the body plate and a diaphragm that is identical in shape to the sensor mount and is mounted along an outer edge of the body plate.
10. The battery cell according to claim 1 or 2, wherein, The battery unit further includes a pressing unit configured to press the battery module and the cooling plate in the first direction.

Description

Battery cell Technical Field The present disclosure relates to a battery cell including a battery module and a cooling plate stacked on a surface of the battery module, wherein the battery module is formed by stacking a plurality of electrode sheets. Background An example of a battery cell (e.g., an all-solid-state battery) having the above-described structure is disclosed in japanese patent application laid-open No. 2015-53261. An active material is locally present on at least one surface of an electrode sheet (e.g., an aluminum laminate film) of the battery module. Disclosure of Invention In a battery module in which a plurality of electrode tabs are stacked, the portions of the electrode tabs where the active material is present are less likely to deform than the portions where the active material is not present. Therefore, stress tends to concentrate at the junction of the two parts. The cooling plate is in contact with the surface of the battery module. A sensor holder holding a sensor that detects information related to the battery module is sometimes mounted on the outer edge of a body plate for cooling the battery module in the cooling plate. In this case, a boundary between the main body plate and the sensor holder is formed on the surface of the cooling plate that abuts against the surface of the battery module. At this junction, a step may be generated due to, for example, manufacturing errors. If the step formed at the junction between the main body plate and the sensor holder is in contact with the surface of the battery module, the electrode sheet on the surface is particularly susceptible to damage at the junction between the active material-existing portion and the active material-absent portion of the battery module where stress is likely to occur. In the present specification, a technique capable of reducing damage applied to an electrode sheet in a battery cell having the above-described structure is provided. The battery cell disclosed in the present specification includes a battery module formed by stacking a plurality of electrode sheets along a first direction, and a cooling plate that is disposed on a surface of the battery module in a superimposed manner. The electrode sheet has a coated portion in which an active material is present on at least one surface, and an uncoated portion adjacent to the coated portion and having two surfaces in which the active material is absent. The cooling plate includes a main body plate that faces the coating portion and is configured to cool the battery module, and at least one sensor holder that is mounted along an outer edge of the main body plate and is configured to hold a sensor that detects information related to the battery module. An abutment surface of the cooling plate against the battery module includes an interface of the body plate and the sensor bracket. In the battery cell disclosed in the present specification, a boundary between the coated portion and the uncoated portion in the electrode sheet and a boundary between the main body plate and the sensor holder in the contact surface of the cooling plate do not overlap each other when viewed in the first direction, and the boundary between the coated portion and the uncoated portion and the boundary between the main body plate and the sensor holder extend parallel to each other. In the above battery cell, the boundary between the coated portion and the uncoated portion, which are prone to stress, and the boundary between the main body plate and the sensor holder, which are prone to step, do not overlap in the region extending parallel to each other. In other words, the boundary between the coated portion and the uncoated portion and the boundary between the main body plate and the sensor holder are positionally offset in the region extending parallel to each other. As a result, even when a step is generated at the interface between the main body plate and the sensor holder, the step is less likely to come into contact with the interface between the coated portion and the uncoated portion. Thus, the stress applied to the battery cells is dispersed into stress generated by the contact of the corners of the steps with the surface of the battery module and stress generated at the boundary between the coated portion and the uncoated portion. As a result, the battery cell disclosed in the present specification can reduce damage applied to the electrode sheet. Details and further modifications of the technology disclosed in this specification will be described in the following "detailed description". Drawings Features, advantages, technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals denote like elements, and in which: fig. 1 is a perspective view of a battery cell of an embodiment; Fig. 2 is an exploded view of a battery cell of an embodiment; FIG. 3 is a cr