EP-4738589-A1 - BATTERY PACK

EP4738589A1EP 4738589 A1EP4738589 A1EP 4738589A1EP-4738589-A1

Abstract

The present application relates to the field of lithium battery technology, and particularly to a battery pack. The battery pack includes a cell module, at least one thermal protection component, a plurality of support bars, a bottom plate, a housing, and a gas passage crossbeam. The bottom plate is connected to the housing such that the bottom plate and the housing together enclose an accommodation space. The bottom of the cell module is provided with at least one row of explosion-proof valves. The cell module is disposed on the thermal protection component, and each thermal protection component is disposed corresponding to one row of explosion-proof valves. The thermal protection component is disposed on the bottom plate with the support bars disposed on both sides of each thermal protection component. The cell module is disposed on the bottom plate via the support bars, such that two support bars disposed on both sides of the thermal protection component, the thermal protection component, and the bottom of the cell module together enclose an exhaust passage. The gas passage crossbeam is disposed on the bottom plate, and the exhaust passage is in communication with the gas passage crossbeam. The housing includes an exhaust portion, and the exhaust passage is in communication with the exhaust portion via the gas passage crossbeam. The battery pack of the present application improves the discharge speed of vent gas and achieves electrical and thermal separation within the battery pack.

Inventors

CHEN, Xuchao
QIN, Chengshuo
TANG, LIJUAN
LI, GUOBING
YANG, CHONG

Assignees

SVOLT Energy Technology Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20240628

Claims (20)

A battery pack, characterized in that the battery pack comprises a cell module, at least one thermal protection component, a plurality of support bars, a bottom plate, a housing, and a gas passage crossbeam, the bottom plate is connected to the housing such that the bottom plate and the housing together enclose an accommodation space for accommodating the cell module; the bottom of the cell module is provided with at least one row of explosion-proof valves, the cell module is disposed on the thermal protection component, and each thermal protection component is disposed corresponding to one row of explosion-proof valves; the thermal protection component is disposed on the bottom plate, with the support bars disposed on both sides of each thermal protection component, and the cell module is disposed on the bottom plate via the support bars, such that two support bars disposed on both sides of the thermal protection component, the thermal protection component, and the bottom of the cell module together enclose an exhaust passage; the gas passage crossbeam is disposed on the bottom plate, and the exhaust passage is in communication with the gas passage crossbeam; and the housing comprises an exhaust portion, and the exhaust passage is in communication with the exhaust portion via the gas passage crossbeam.
The battery pack according to claim 1, characterized in that , a plurality of thermal protection components are disposed on the bottom plate at intervals along a first direction, and each thermal protection component is provided with said support bars on two opposite sides thereof in the first direction, the bottom plate comprises a plurality of strip-shaped through holes, the thermal protection components are disposed in corresponding strip-shaped through holes, wherein the thermal protection components are provided with thinned portions; and the battery pack further comprises a bottom protection plate disposed on the side of the bottom plate facing away from the cell module, the bottom protection plate and the bottom plate are spaced apart in a second direction, such that a buffer cavity is formed between the bottom protection plate and the bottom plate.
The battery pack according to claim 2, characterized in that the housing comprises a front edge beam, a rear edge beam, and two side beams disposed opposite to each other, the two ends of the front edge beam are respectively connected to first ends of the two side beams, and the two ends of the rear edge beam are respectively connected to second ends of the two side beams; the exhaust portion is disposed on the rear edge beam, the gas passage crossbeam comprises a first cavity extending along the first direction, each of the side beams comprises a second cavity extending along a third direction, the first cavity is in communication with the exhaust portion via the second cavity, and the third direction is perpendicular to the first direction.
The battery pack according to claim 3, characterized in that , the cell module comprises a plurality of cell assemblies, each of the cell assemblies comprises a plurality of cells stacked along the third direction, and terminals of the cells are disposed on end faces of the cells in the first direction.
The battery pack according to claim 4, characterized in that the battery pack further comprises a longitudinal beam, the longitudinal beam extends along the third direction perpendicular to the first direction, the gas passage crossbeam and the longitudinal beam divide the accommodation space into a plurality of placement portions, one of the cell assemblies is correspondingly disposed in each of the placement portions, and a side surface of each of the cell assemblies close to the gas passage crossbeam abuts against the gas passage crossbeam.
The battery pack according to claim 5, characterized in that both sides of the gas passage crossbeam that are opposite to each other in the third direction are provided with a plurality of ventilation holes, and each of the ventilation holes is in communication with a corresponding exhaust passage; the edge of the ventilation hole is provided with a sealing strip, and the side surface of the cell assembly close to the gas passage crossbeam fits against the gas passage crossbeam via the sealing strip.
The battery pack according to claim 5, characterized in that the battery pack further comprises a position-limiting strip, the position-limiting strip is fixedly disposed on both sides of the gas passage crossbeam that are opposite to each other in the third direction, and the position-limiting strip extends along the first direction.
The battery pack according to claim 5, characterized in that the battery pack further comprises a front crossbeam and a rear crossbeam both extending along the first direction, two ends of the cell module respectively abut against the front crossbeam and the rear crossbeam; the rear crossbeam further comprises a third cavity extending along the first direction and a gas passage opening, the gas passage opening is disposed offset from the exhaust portion, and the second cavity is in communication with the exhaust portion sequentially via the third cavity and the gas passage opening.
The battery pack according to claim 1, characterized in that the support bar comprises a support body and a plurality of elastic support columns, the elastic support columns are embedded in the support body, and the plurality of elastic support columns are spaced apart along an extending direction of the support body.
The battery pack according to any one of claims 1 to 9, characterized in that the thermal protection component comprises a plurality of thinned portions, and the plurality of thinned portions comprised in each of the thermal protection components are disposed in one-to-one correspondence with a plurality of the explosion-proof valves in a corresponding row.
A battery pack, characterized in that the battery pack comprises a housing, a partition beam, a plurality of cell assemblies, and a bottom plate, the bottom plate is connected to the housing, and the bottom plate and the housing together enclose an accommodation space for accommodating the cell assemblies; the partition beam is connected to the housing to divide the accommodation space into a plurality of accommodation portions, and each of the accommodation portions is provided with one of the cell assemblies correspondingly, the bottom plate comprises at least one strip-shaped through hole, and the bottom of each of the cell assemblies is provided with at least one row of explosion-proof valves, and each row of the explosion-proof valves is in communication with a corresponding strip-shaped through hole.
The battery pack according to claim 11, characterized in that the bottom plate comprises a plurality of strip-shaped through holes spaced apart along a first direction, the partition beam comprises a middle crossbeam and a longitudinal beam, the middle crossbeam and the longitudinal beam are both connected to the housing to divide the accommodation space into four accommodation portions, wherein the middle crossbeam extends along the first direction, the longitudinal beam extends along a second direction, and the first direction is perpendicular to the second direction, the battery pack further comprises a front crossbeam and a rear crossbeam extending along the first direction, the front crossbeam and the rear crossbeam are both connected to the housing, and four cell assemblies are disposed between the front crossbeam and the rear crossbeam.
The battery pack according to claim 12, characterized in that the housing comprises a front edge beam, a rear edge beam, and two side edge beams connected to one another, the front edge beam and the rear edge beam both extend along the first direction, and the side edge beams extend along the second direction, the two ends of the middle crossbeam are respectively connected to the two side edge beams, the two ends of the front crossbeam are respectively connected to the two side edge beams, the two ends of the rear crossbeam are respectively connected to the two side edge beams, and the two ends of the longitudinal beam are respectively connected to the front crossbeam and the rear crossbeam.
The battery pack according to claim 13, characterized in that the bottom plate comprises a plurality of strip-shaped plate members extending along the second direction, a strip-shaped through hole is formed between two adjacent strip-shaped plate members, each of the strip-shaped plate members is simultaneously connected to the front crossbeam, the middle crossbeam, and the rear crossbeam, among the plurality of strip-shaped plate members, two of the strip-shaped plate members are respectively connected to the two side edge beams, and one of the strip-shaped plate members is connected to the longitudinal beam.
The battery pack according to claim 14, characterized in that the two of the strip-shaped plate members, the two side edge beams, the front edge beam, and the rear edge beam are integrally formed by profile extrusion.
The battery pack according to claim 14, characterized in that the front crossbeam, the middle crossbeam, and the rear crossbeam each is connected to the plurality of strip-shaped plate members through a rivet, and the front crossbeam, the middle crossbeam, and the rear crossbeam each has a hollow structure.
The battery pack according to claim 14, characterized in that the battery pack further comprises a cooling plate and a thermally conductive structural adhesive, the cooling plate is connected to the housing and located at the top of the cell assemblies, and the cooling plate is bonded to the cell assemblies via the thermally conductive structural adhesive.
The battery pack according to claim 17, characterized in that the battery pack further comprises a bottom protection plate, the bottom protection plate is connected to the housing and located at the bottom of the cell assemblies, an external bolt is capable of sequentially passing through the cooling plate and the middle crossbeam and connecting to the bottom protection plate, an external bolt is capable of sequentially passing through the cooling plate, the longitudinal beam, and a corresponding strip-shaped plate member and connecting to the bottom protection plate.
The battery pack according to claim 17, characterized in that the battery pack further comprises a structural adhesive and an adhesive-applying position-limiting strip, the adhesive-applying position-limiting strip is disposed at the edge of the strip-shaped plate member, the structural adhesive is disposed inside the adhesive-applying position-limiting strip, the cell assemblies and the bottom plate are bonded together via the structural adhesive.
The battery pack according to claim 18, characterized in that the battery pack further comprises a plurality of thermal protection components and a plurality of support bars, the plurality of support bars are disposed on the bottom protection plate and spaced apart along the first direction, each of the thermal protection components is bridged via two adjacent support bars, and the thermal protection components are disposed on the side of the support bars facing away from the bottom protection plate, such that the two adjacent support bars, the bottom protection plate, and a corresponding thermal protection component together enclose an exhaust passage; the cell assemblies are disposed on the thermal protection components, among the explosion-proof valves comprised in each of the cell assemblies, each row of the explosion-proof valves is connected to a corresponding thermal protection component through a corresponding strip-shaped through hole, and the housing comprises an exhaust portion, and each exhaust passage is in communication with the exhaust portion.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application claims priority to a Chinese patent application filed with the China National Intellectual Property Administration on June 28, 2023, with application number 202321671845.4 and invention title "Battery Pack", claims priority to a Chinese patent application filed with the China National Intellectual Property Administration on June 28, 2023, with application number 202321671807.9 and invention title "Battery Pack", and claims priority to a Chinese patent application filed with the China National Intellectual Property Administration on June 28, 2023, with application number 202321674025.0 and invention title "Battery Pack", the entire contents of which are incorporated by reference into the present application. TECHNICAL FIELD The present application relates to the field of lithium battery technology, and particularly relates to a battery pack. BACKGROUND With the rise of new energy vehicles, the design of battery packs flourished with diverse approaches. Safety design of battery packs has now become a hot prominent research focus, with hot topics including thermal runaway safety and the layout configurations of battery packs. On one hand, in traditional designs, explosion-proof valves for battery cells are typically disposed on the top or sides of the cell module, while no dedicated exhaust channels are provided at the top or sides of the battery pack to facilitate gas flow. A large amount of gas inside the battery pack not only affects terminals of the cell module, but also slows down the venting of gases released from the cell explosion-proof valves to the outside of the battery pack. Therefore, such existing battery pack structures fail to achieve thermal and electrical separation, while also exhibiting slow gas discharge. On the other hand, conventional battery packs often consist of multiple cells assembled into modules which are directly installed into the housing of the battery pack. However, traditional battery pack designs have low assembly efficiency. To address this issue, blade battery pack structures have emerged. An existing blade battery pack divides an accommodation space of the housing into four parts through a crossbeam and a longitudinal beam, with each part correspondingly installing one cell module and a bottom plate support disposed at a bottom. However, in the existing blade battery pack, since the bottom plate support is disposed at the bottom of the cell module, an explosion-proof valve disposed at the bottom of the cell module has inconvenient gas discharge, and the blade battery pack has a large weight. SUMMARY The purpose of the present application is to provide a battery pack to solve a problem that an existing battery pack structure fails to achieve thermal and electrical separation, has slow gas discharge, or has excessive battery pack weight. According to a first aspect of the present application, a battery pack is provided, the battery pack includes a cell module, at least one thermal protection component, a plurality of support bars, a bottom plate, a housing, and a gas passage crossbeam, the bottom plate is connected to the housing such that the bottom plate and the housing together enclose an accommodation space for accommodating the cell module; the bottom of the cell module is provided with at least one row of explosion-proof valves, the cell module is disposed on the thermal protection component, and each thermal protection component is disposed corresponding to one row of explosion-proof valves; the thermal protection component is disposed on the bottom plate, with the support bars disposed on both sides of each thermal protection component, and the cell module is disposed on the bottom plate via the support bars, such that two support bars disposed on both sides of the thermal protection component, the thermal protection component, and the bottom of the cell module together enclose an exhaust passage; the gas passage crossbeam is disposed on the bottom plate, and the exhaust passage is in communication with the gas passage crossbeam; the housing includes an exhaust portion, and the exhaust passage is in communication with the exhaust portion via the gas passage crossbeam. Optionally, a plurality of thermal protection components are disposed on the bottom plate at intervals along a first direction, and each thermal protection component is provided with said support bars on two opposite sides thereof in the first direction, the bottom plate includes a plurality of strip-shaped through holes, the thermal protection components are disposed in corresponding strip-shaped through holes, and the thermal protection components are provided with thinned portions; the battery pack further includes a bottom protection plate disposed on the side of the bottom plate facing away from the cell module, the bottom protection plate and the bottom plate are spaced apart in a second direction, such that a buffer cavity is formed