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CN-122000646-A - Battery module

CN122000646ACN 122000646 ACN122000646 ACN 122000646ACN-122000646-A

Abstract

The invention relates to a battery module, comprising a battery element, a1 st collector electrically connected with the battery element, a2 nd collector arranged opposite to the 1 st collector and electrically connected with the 1 st collector, and a plurality of resin insulators arranged between the 1 st collector and the 2 nd collector, wherein the battery element comprises a positive electrode, a negative electrode and a resin spacer arranged between the positive electrode and the negative electrode, the part of the 1 st collector and the 2 nd collector, which is arranged between the positive electrode and the negative electrode, is electrically insulated by the insulator, the part of the 1 st collector and the 2 nd collector, which is not arranged between the two, is electrically connected, the melting point of the resin of the insulator is lower than the melting point of the resin of the spacer, and the insulator is melted by the heat generated by the electrification of the 1 st collector and the 2 nd collector and expands between the two.

Inventors

  • MATSUI NOBUO

Assignees

  • 丰田自动车株式会社

Dates

Publication Date
20260508
Application Date
20251031
Priority Date
20241106

Claims (5)

  1. 1. A battery module is provided with: A battery element; a 1 st current collector electrically connected to the battery element; a2 nd current collector disposed so as to face the 1 st current collector and electrically connected to the 1 st current collector, and A plurality of resin insulators disposed between the 1 st collector and the 2 nd collector, The battery element is provided with: A positive electrode; Negative electrode, and A resin separator disposed between the positive electrode and the negative electrode, The portion of the 1 st collector and the 2 nd collector between which the insulator is arranged is electrically insulated by the insulator, the portion between which the insulator is not arranged is electrically connected, The melting point of the resin of the insulator is lower than that of the resin of the spacer, The insulator is melted by heat generated by energizing the 1 st current collector and the 2 nd current collector, and spreads between the 1 st current collector and the 2 nd current collector.
  2. 2. The battery module according to claim 1, The thickness of the insulator is thinner than the thickness of the 1 st collector and thinner than the thickness of the 2 nd collector.
  3. 3. The battery module according to claim 1 or 2, The plurality of insulators are arranged in a 1 st direction and extend in a2 nd direction different from the 1 st direction.
  4. 4. The battery module according to claim 3, The width of the insulator in the 1 st direction is narrower than the width between the insulator and the insulator adjacent in the 1 st direction.
  5. 5. The battery module according to claim 1 or 2, The resin of the insulator has a melting point higher than an upper limit value of a temperature at which the battery module is normally used.

Description

Battery module Technical Field The technology disclosed in this specification relates to a battery module. Background A battery module is disclosed in japanese patent laid-open No. 2007-66806. The battery module of japanese patent application laid-open No. 2007-66806 includes a 1 st current collector, a 2 nd current collector electrically connected to the 1 st current collector, a plurality of insulators arranged between the 1 st current collector and the 2 nd current collector, and a battery element electrically connected to the 1 st current collector. The 1 st current collector and the 2 nd current collector are electrically insulated by an insulator at a portion where the insulator is disposed therebetween, and are electrically connected at a portion where the insulator is not disposed therebetween. Disclosure of Invention In the battery module, for example, an excessive current flows due to an external short circuit or the like. Then, the battery module is considered to be abnormally heated, and the battery element is damaged. Accordingly, the present specification provides a technique capable of suppressing abnormal temperature rise of a battery module. In embodiment 1 of the present technology, a battery module includes a battery element, a1 st collector electrically connected to the battery element, a 2 nd collector disposed so as to face the 1 st collector and electrically connected to the 1 st collector, and a plurality of resin insulators disposed between the 1 st collector and the 2 nd collector. The battery element includes a positive electrode, a negative electrode, and a resin separator disposed between the positive electrode and the negative electrode. The 1 st collector and the 2 nd collector are electrically insulated by the insulator at a portion between which the insulator is arranged, and are electrically connected at a portion between which the insulator is not arranged. The melting point of the resin of the insulator is lower than the melting point of the resin of the spacer. The insulator is melted by heat generated by energizing the 1 st current collector and the 2 nd current collector, and spreads between the 1 st current collector and the 2 nd current collector. According to this structure, when the 1 st and 2 nd collectors abnormally generate heat due to an excessive current flowing through the battery module, the insulator melts and spreads between the 1 st and 2 nd collectors. This can cut off or suppress the current passing through the 1 st current collector and the 2 nd current collector. As a result, excessive current can be suppressed from flowing through the battery module, and abnormal temperature rise of the battery module can be suppressed. In addition, the battery element can be protected by melting the insulator before the melting of the separator. In claim 2, in the above-described claim 1, the thickness of the insulator may be smaller than the thickness of the 1 st current collector and smaller than the thickness of the 2 nd current collector. In claim 3, in the above-described 1 or 2, a plurality of the insulators may be arranged in the 1 st direction and may extend in a2 nd direction different from the 1 st direction. In the 4 th aspect, in the 3 rd aspect, the width of the insulator in the 1 st direction may be narrower than the width between the insulator and the insulator adjacent to each other in the 1 st direction. In claim 5, in any one of the above-described 1 to 4, the melting point of the resin of the insulator may be higher than an upper limit value of the temperature at which the battery module is normally used. Drawings Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like numerals denote like elements. Fig. 1 is a diagram schematically showing a battery module of an embodiment. FIG. 2 is a section view II-II of FIG. 1; fig. 3 is a diagram schematically showing a battery module of the embodiment. Detailed Description The battery module 2 of the embodiment is described with reference to the drawings. As shown in fig. 1, a battery module 2 of the embodiment includes a plurality of battery elements 10 and an exterior body 30 accommodating the plurality of battery elements 10. The battery module 2 further includes, in each of the plurality of battery elements 10, a positive electrode 1 st collector 20 and a negative electrode 1 st collector 22 for collecting electricity generated by the battery element 10. The battery module 2 further includes a positive electrode 2 nd collector 50 and a negative electrode 2 nd collector 52 for collecting electricity generated by the plurality of battery elements 10. Further, the battery module 2 includes a plurality of positive electrode insulators 40 disposed between the positive electrode 1 st current collector 20 and the positive electrode 2 nd current collector 50, and a plurali