CN-122025911-A - Battery pack and heat transfer tube assembly

CN122025911ACN 122025911 ACN122025911 ACN 122025911ACN-122025911-A

Abstract

The invention belongs to the field of batteries, and particularly relates to a battery pack and a heat transfer tube assembly. The problem of the local too high heat of monomer battery utmost point post in current battery package, cause thermal runaway is solved. The battery pack comprises a plurality of battery components, wherein each battery component comprises a battery module and two heat transfer pipe assemblies, each battery module comprises a plurality of single batteries, the two heat transfer pipe assemblies are respectively arranged on two side polarity terminals, two mutually isolated sub-channels are arranged in each heat transfer pipe, each heat transfer pipe assembly comprises a spliced conductive first hollow component and an insulating second hollow component, the plurality of battery components are sequentially connected in series according to a set sequence, and the heat transfer pipe assemblies are in direct contact with the polarity terminals of the single batteries.

Inventors

LEI ZHENGJUN
ZHANG SANXUE

Assignees

双澳储能科技（西安）有限公司

Dates

Publication Date: 20260512
Application Date: 20250403

Claims (10)

1. A battery pack is characterized by comprising n battery components arranged along a first direction; the battery component comprises a battery module and two heat transfer pipe assemblies; the battery module comprises m single batteries arranged along a second direction, wherein n and m are integers greater than 1, and the first direction is vertical to the second direction; The two heat transfer pipe assemblies extend along the second direction and are arranged at the top of the battery module in parallel along the first direction, wherein one heat transfer pipe assembly is positioned on m polar terminals on one side; Two mutually isolated sub-channels extending along a second direction are arranged in each heat transfer tube assembly, and the two sub-channels and the heat transfer tube assembly have the same size in the second direction; Each heat transfer tube assembly comprises a plurality of sections of first hollow members and second hollow members, wherein the first hollow members are conductive members and are connected with the polar terminals of the single batteries to realize the serial connection of the single batteries in the battery module; In the n battery components, in one outermost heat transfer tube assembly along the first direction, the same side ports of the two sub-channels are respectively used as a total liquid inlet end and a total liquid outlet end; in the other outermost heat transfer tube assembly along the first direction, the ports on the same side of the two sub-channels are connected in series to serve as return turning nodes of the loop, and among the other ports, the sub-channel ports of different heat transfer tube assemblies are sequentially connected in series according to a set sequence to form a closed liquid path from a total liquid inlet end to a total liquid outlet end; After entering the total liquid inlet end, the cooling liquid sequentially flows through one sub-channel in each heat transfer pipe assembly, then sequentially flows through the other sub-channel in each heat transfer pipe assembly through the return circuit turning node, and flows out from the total liquid outlet end.
2. The battery pack according to claim 1, wherein among the remaining ports, ports of two adjacent sub-channels located at the middle position among four sub-channels of adjacent heat transfer pipe assemblies on different battery components on the side of the total liquid inlet end and the total liquid outlet end are connected in series, and ports of two sub-channels located at the outer side are connected in series; And among the four sub-channels of the adjacent heat transfer pipe assemblies, the ports of the two adjacent sub-channels positioned in the middle are connected in series, and the ports of the two sub-channels positioned on the outer side are connected in series on one side far away from the total liquid inlet end and the total liquid outlet end on the same battery component.
3. The battery pack according to claim 1, wherein among the remaining ports, ports of two sub-channels at alternate positions among four sub-channels of adjacent heat transfer pipe assemblies on different battery members on a side of a total liquid inlet end and a total liquid outlet end are connected in series; And ports of two sub-channels which are arranged at alternate positions in four sub-channels of the adjacent heat transfer pipe assemblies are connected in series on the same battery component at one side far away from the total liquid inlet end and the total liquid outlet end.
4. The battery pack of claim 1, wherein the polarity terminals are each provided with a first through groove extending in the first direction, and the heat transfer tube assembly is mounted in the first through groove.
5. The battery pack according to claim 4, wherein a step structure is arranged on the outer wall of the first hollow member along the first direction, the horizontal plane of the step structure is flush with the end face of the side wall of the first through groove, and the welding connection is performed at the joint of the horizontal plane of the step structure and the end face of the side wall of the first through groove.
6. The battery pack of claim 1, wherein the first hollow member and the second hollow member are sealingly connected by a spigot mating structure.
7. The heat transfer pipe assembly is characterized by comprising a spliced pipe body, wherein two mutually isolated sub-channels extending along a second direction are arranged in the pipe body, and the two sub-channels and the heat transfer pipe assembly have the same size in the second direction; The spliced pipe body comprises a plurality of sections of first hollow components and second hollow components, wherein the first hollow components are conductive components and are used for being connected with the polar terminals of the single batteries to realize the serial connection of the single batteries, and the second hollow components are insulating components and are connected between two adjacent sections of first hollow components.
8. The heat transfer tube assembly of claim 7 wherein the outer wall of the first hollow member is provided with a stepped structure along a first direction.
9. The heat transfer tube assembly of claim 7 wherein the first hollow member is sealingly connected to the second hollow member by a spigot mating structure.
10. The heat transfer tube assembly of claim 7 wherein heat dissipating teeth are provided on an inner wall of the tube body.

Description

Battery pack and heat transfer tube assembly Technical Field The invention belongs to the field of batteries, and particularly relates to a battery pack and a heat transfer tube assembly. Background At present, a common battery pack is formed by electrically connecting a plurality of battery modules together. The temperature control of the battery pack is always a focus of attention in the field, and most of the existing battery packs adopt an air cooling or liquid cooling mode to control the temperature of the whole battery pack. However, since the battery cell pole in the battery pack is the most concentrated part of heat, when the local heat of the pole is too high, the thermal runaway of the battery cell in the battery pack is most likely to occur. Disclosure of Invention The invention aims to provide a battery pack and a heat transfer tube assembly, which solve the problem that the local heat of a single battery pole in the existing battery pack is too high to cause thermal runaway. A first aspect of the present invention provides a battery pack including n battery members arranged in a first direction; The battery component comprises a battery module and two heat transfer pipe components; the battery module comprises m single batteries arranged along a second direction, wherein n and m are integers greater than 1, and the first direction is vertical to the second direction; The two heat transfer pipe assemblies extend along the second direction and are arranged at the top of the battery module in parallel along the first direction, wherein one heat transfer pipe assembly is positioned on m polar terminals on one side; Two mutually isolated sub-channels extending along a second direction are arranged in each heat transfer tube assembly, and the two sub-channels and the heat transfer tube assembly have the same size in the second direction; Each heat transfer tube assembly comprises a plurality of sections of first hollow members and second hollow members, wherein the first hollow members are conductive members and are connected with the polar terminals of the single batteries to realize the serial connection of the single batteries in the battery module; In the n battery components, in one outermost heat transfer tube assembly along the first direction, the same side ports of the two sub-channels are respectively used as a total liquid inlet end and a total liquid outlet end; in the other outermost heat transfer tube assembly along the first direction, the ports on the same side of the two sub-channels are connected in series to serve as return turning nodes of the loop, and among the other ports, the sub-channel ports of different heat transfer tube assemblies are sequentially connected in series according to a set sequence to form a closed liquid path from a total liquid inlet end to a total liquid outlet end; After entering the total liquid inlet end, the cooling liquid sequentially flows through one sub-channel in each heat transfer pipe assembly, then sequentially flows through the other sub-channel in each heat transfer pipe assembly through the return circuit turning node, and flows out from the total liquid outlet end. According to the invention, the heat transfer pipe component is directly contacted with the polar terminal (positive electrode/negative electrode) of the single battery to dissipate heat, so that the preferential cooling of the battery tab/terminal area is realized. The area is easy to generate local high temperature due to the current collecting effect, and can be cooled down rapidly by direct cooling, so that chain reaction caused by hot spots, such as SE I film decomposition, lithium dendrite growth and the like, can be effectively avoided. In addition, the heat transfer pipe assembly adopts a splicing structure and can be used as an electric connecting piece, so that the serial connection of all single batteries in the battery component is realized, and the structure of the whole battery module is simpler. In addition, the invention adopts a double-channel serial cooling structure, and has the core design that two mutually isolated sub-channels (the two sub-channels can be respectively defined as a liquid inlet sub-channel and a liquid outlet sub-channel) are arranged in each heat transfer tube assembly, the same-side ports of the two sub-channels of one outermost heat transfer tube assembly are respectively used as a total liquid inlet end and a total liquid outlet end, the sub-channels of each heat transfer tube assembly in the middle are connected in series according to a set sequence, and the same-side ports of the two sub-channels of the other outermost heat transfer tube assembly are connected in series to be used as loop turning nodes. After entering the total liquid inlet end, the cooling liquid sequentially flows through one sub-channel (liquid inlet sub-channel) in each heat transfer tube assembly, then sequentially flows through the other sub-channel (liquid outlet