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EP-4742405-A1 - BATTERY MODULE AND BATTERY PACK

EP4742405A1EP 4742405 A1EP4742405 A1EP 4742405A1EP-4742405-A1

Abstract

The invention provides a battery module (1) and a battery pack (2). The battery module (1) includes a plurality of cells (10), an integrated busbar (20) and a fireproof strip (30). A pressure relief valve (111) is arranged on a top of each cell (10), and the integrated busbar (20) is arranged on a side of all tops of the plurality of cells (10). The fireproof strip (30) is arranged on a side of the integrated busbar (20) away from the cells (10). The fireproof strip (30) is provided with a plurality of through hole (31), and each through hole (31) of the plurality of through holes (31) corresponds to one pressure relief valve (111).

Inventors

  • REN, Chaoju
  • HUANG, YI
  • ZHANG, Guojiang

Assignees

  • Eve Energy Co., Ltd.

Dates

Publication Date
20260513
Application Date
20251106

Claims (11)

  1. A battery module (1), characterized by comprising: a plurality of cells (10), each cell (10) of the plurality of cells (10) being provided with a pressure relief valve (111) on a top of each cell (10); an integrated busbar (20) arranged on a side of all tops of the plurality of cells (10); a fireproof strip (30) arranged on a side of the integrated busbar (20) away from the cells (10), wherein the fireproof strip (30) is provided with a plurality of through holes (31), and each through hole (31) of the plurality of through holes (31) corresponds to one pressure relief valve (111).
  2. The battery module (1) according to claim 1, wherein an insulating part (32) is provided within each through hole (31), and an edge of the insulating part (32) is connected with a side wall of the through hole (31) by a weakening structure (34).
  3. The battery module (1) according to claim 2, wherein the weakening structure (34) comprises a plurality of connecting ribs arranged at intervals along the edge of the insulating part (32).
  4. The battery module (1) according to any one of claims 1 to 3, wherein a side surface of the fireproof strip (30) is provided with an insulating film (33) covering the plurality of through holes (31), and a thickness of the insulating film (33) is smaller than a thickness of the fireproof strip (30).
  5. The battery module (1) according to any one of claims 1 to 4, wherein the pressure relief valve (111) has a circular ring shape, the through hole (31) is a circular hole, and a diameter of the through hole (31) is greater than an outer diameter of the pressure relief valve (111) and smaller than an outer diameter of the cell (10).
  6. The battery module (1) according to any one of claims 1 to 5, wherein the cell (10) comprises a first electrode (113) and a second electrode (114) arranged on a same end face of the cell as the pressure relief valve (111), the first electrode (113) is arranged around the pressure relief valve (111), and the pressure relief valve (111) is arranged around the second electrode (114).
  7. The battery module (1) according to claim 6, wherein the pressure relief valve (111) is connected with the second electrode (114).
  8. The battery module (1) according to claim 6 or 7, wherein the integrated busbar (20) comprises a main busbar (21), the main busbar (21) comprises a plurality of conductive strips (211) arranged along a first direction, and the plurality of conductive strips (211) are configured for connecting a plurality of cells (10) in series; each conductive strip (211) comprises a first subpart (2111) connected with the first electrode (113), a second subpart (2112) connected with the second electrode (114), and a first weakening part (2113) configured for connecting the first subpart (2111) and the second subpart (2112), the second subpart (2112) and at least part of the first weakening part (2113) are exposed through the through hole (31), a cross-sectional area of each of the first subpart (2111) and the second subpart (2112) is greater than a cross-sectional area of the first weakening part (2113).
  9. The battery module (1) according to claim 8, wherein each of the conductive strips (211) comprises a second weakening part (2114) connecting two adjacent second subparts (2112), the second weakening part (2114) is exposed through the through hole (31), a cross-sectional area of the second subpart (2112) is greater than a cross-sectional area of the second weakening part (2114).
  10. The battery module (1) according to claim 9, wherein the integrated busbar (20) comprises a bracket (22) arranged between the main busbar (21) and the cells (10), the bracket (22) supports the main busbar (21), each of the conductive strips (211) comprises a connecting arm (2115), both ends of the connecting arm (2115) are connected with two adjacent second weakening parts (2114), the bracket (22) is provided with a groove (221), and the connecting arm (2115) is arranged in the groove (221).
  11. A battery pack (2), comprising the battery module (1) according to any one of claims 1 to 10.

Description

TECHNICAL FIELD The invention relates to the field of battery technology, in particular to a battery module and a battery pack. BACKGROUND The battery module includes a plurality of cells. In related technology, after a thermal runaway of a cell, a pressure relief valve of the cell would be opened to release a pressure inside the cell. SUMMARY However, the conductive substances inside the cell, such as pole pieces, graphite and metal particles etc., are ejected upwards along with an air flow inside the cell. The conductive substances can easily cause short circuits in other cells within the battery module, thus resulting in a continuous thermal diffusion. Embodiments of the invention provide a battery module. The battery module includes a plurality of cells, an integrated busbar and a fireproof strip. Each cell is provided with a pressure relief valve on a top of each cell, and the integrated busbar is arranged on a side of all tops of the plurality of cells. The fireproof strip is arranged on a side of the integrated busbar facing away from the cells, and the fireproof strip is provided with a plurality of through holes, and each through hole of the plurality of through holes corresponds to one pressure relief valve. The invention also provides a battery pack. The embodiments of the invention provide a battery pack comprising the aforementioned battery module. BENEFICIAL EFFECTS In the embodiments of the invention, a fireproof strip is arranged on a side of the integrated busbar facing away from the cells. The fireproof strip is provided with a plurality of through holes that expose the pressure relief valves on the tops of the cells. When a thermal runaway in a cell appears, the pressure relief valve of the cell opens, and the conductive substances ejected along with the gas can be separated by the fireproof strip, thereby avoiding the technical problem of the continuous thermal diffusion due to the short circuits of other cells in the battery module caused by the contact between the conductive substances and the cells and/or the integrated busbar. For the battery pack provided in the invention, when a cell undergoes a thermal runaway, a pressure relief valve of the cell opens and the conductive substances ejected along with the gas can be separated by the fireproof strip, thereby avoiding the technical problem of the continuous thermal diffusion due to the short circuits of other cells in the battery module caused by the contact between the conductive substances and the cells and/or the integrated busbar, and improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a three-dimensional schematic view of a battery module according to the embodiments of the invention;Fig. 2 is a schematic explosion view of a battery module in Fig. 1;Fig. 3 is an enlarged schematic structure view of a cell in Fig. 1;Fig. 4A is a schematic view of a top view structure of a fireproof strip in Fig. 2;Fig. 4B is another schematic view of a top view structure of a fireproof strip in Fig. 2;Fig. 5A is a schematic explosion view of an integrated busbar in Fig. 2;Fig. 5B is a schematic top view of a partial structure of a battery module in Fig. 1;Fig. 6 is an enlarged schematic structure view of a conductive strip in Fig. 5A;Fig. 7 is an enlarged schematic structure view at point A in Fig. 5A;Fig. 8 is a schematic structural view of a battery pack according to the embodiments of the invention. Reference numerals: battery module 1;cell 10, housing 12, cover plate assembly 11, pressure relief valve 111, pole 112, first electrode 113, second electrode 114;integrated busbar 20, main busbar 21, conductive strip 211, first subpart 2111, second subpart 2112, first weakening part 2113, second weakening part 2114, connecting arm 2115, first busbar end 212, second busbar end 213, bracket 22, groove 221, flexible circuit board 23, connecting piece 231;fireproof strip 30, through hole 31, insulating part 32, weakening structure 34, insulating film 33;first direction D1, second direction D2;battery pack 2. DETAILED DESCRIPTION OF THE EMBODIMENTS Unless otherwise specified in the invention, directional words such as "top" and "bottom" usually refer to the top and bottom of the device under actual conditions of use or working, in particular the directions in the accompanying drawings; and "inside" and "outside" refer to the outline of the device. In the description of the invention, unless otherwise specified and limited, the term "connected to each other", "connected" or "fixed" is to be construed in a broad sense, for example, as fixedly connected, detachably connected, or integrated; mechanically connected or electrically connected; directly connected to each other or indirectly connected to each other via an intermediary; or internally connected between two elements or interactional between two elements. Meanings of the preceding terms in the invention may be understood according to situations. In a first aspect, t