CN207719276U - A kind of battery pack temperature uniforming heat radiation structure - Google Patents

Abstract

The utility model provides a battery pack uniform temperature heat dissipation structure, which comprises a plurality of sequentially arranged battery modules, a plurality of water cooling plates, a plurality of distribution pipes and a plurality of collectors; the battery module is arranged by a plurality of battery modules connected in series A plurality of water-cooled plates include an upper water-cooled plate and a lower water-cooled plate respectively arranged on both sides of the battery module. Both ends of the upper water-cooled plate and the lower water-cooled plate are provided with distribution pipes and headers, which are respectively connected to the distribution pipes or collectors. The flow pipe forms a cooling water circuit; each battery module includes a plurality of single cells and multiple temperature equalizers interspersed between the single cells; each temperature equalizer is composed of two layers of insulating and heat conducting sheets The main body and the ends located at both ends of the main body, the main body is attached to the side of the adjacent single cell, the main body is interposed with a heat insulating film between two layers of insulating and heat-conducting sheets, and the end is against the battery module Water-cooled plates on both sides. The battery pack heat dissipation structure provided by the utility model has the advantages of compact structure, short heat transfer distance and high heat dissipation efficiency.

Description

A battery pack heat dissipation structure

【Technical field】

The utility model relates to the technical field of batteries, in particular to a battery pack heat dissipation structure for uniform temperature.

【Background technique】

With the increasing energy crisis and environmental pollution problems, energy-saving and environmentally friendly new energy vehicles have been rapidly developed. The power of new energy vehicles comes from the battery pack. The battery pack has a compact structure. The battery generates a lot of heat during high-rate charging and discharging. The heat is easy to accumulate, and it is easy to cause local overheating or uneven temperature, which will easily lead to battery performance degradation, capacity and life attenuation. It even leads to the occurrence of thermal runaway of the battery. Therefore, in order to maximize the performance and life of the battery pack, it is necessary to optimize the structure of the battery pack and add a heat sink for thermal management.

According to the heat transfer medium used, the battery thermal management system can be divided into: thermal management system using air cooling, thermal management system using liquid cooling and thermal management system using phase change materials to dissipate heat. The air-cooled thermal management system is easy to use and simple in structure, but due to the dense layout of the cells, the large resistance to air flow, the internal flow field is difficult to organize, and there are many dead zones in the flow, which can easily lead to local high temperature in the battery box; and the convective heat transfer coefficient of the air Small, not suitable for high thermal load conditions such as high-rate charging and discharging of batteries. The thermal management system adopts liquid cooling or phase change materials for heat dissipation. The sensible heat of liquid cooling is large, and the latent heat of phase change is large. However, the structure of liquid cooling and phase change heat dissipation is complex and the reliability is low; there are many supporting accessories, the cost is high, and many The metal material reduces the overall energy density of the battery pack.

In view of this, it is necessary to provide a battery pack heat dissipation structure to overcome the above-mentioned defects.

【Content of utility model】

The purpose of the utility model is to provide a battery pack heat dissipation structure to ensure the consistency of the working temperature of the power battery and high heat dissipation efficiency.

In order to achieve the above purpose, the utility model provides a battery pack heat dissipation structure, which includes a plurality of sequentially arranged battery modules, a plurality of water cooling plates, a plurality of distribution pipes and a plurality of collectors; each battery module consists of A plurality of battery modules arranged in series; multiple water-cooled plates include upper water-cooled plates and lower water-cooled plates respectively arranged on both sides of each battery module, and one upper water-cooled plate or one lower water-cooled plate is connected with a battery module One side of each battery module is attached; two ends of the upper water-cooled plate are respectively provided with a distribution pipe, and two ends of the lower water-cooled plate are respectively provided with a collector pipe, and the upper water-cooled plate and the lower water-cooled plate are respectively provided with a distribution pipe. The cooling water circuit is formed by connecting pipes to distribution pipes or headers respectively; each battery module includes multiple single cells and multiple temperature equalizers interspersed between multiple single cells; each temperature equalizer Including the main body and the ends located at both ends of the main body, the main body of each temperature spreader is attached to the side of the adjacent single cell; each temperature spreader is made of two layers of insulating and heat conducting sheets, and each The main body of each temperature equalizing plate is sandwiched with a heat insulating film between two layers of insulating and heat conducting plates; the ends of each temperature equalizing plate are against the water cooling plates on both sides of the battery module respectively.

In a preferred embodiment, every two adjacent battery modules share an upper water-cooling plate and a lower water-cooling plate; the upper water-cooling plates located at both ends of multiple battery modules are connected to each distribution pipe through pipes, located at The lower water cooling plates at both ends of the plurality of battery modules are connected to each header through pipes.

In a preferred embodiment, the distribution pipe is used for introducing cooling water and distributing it to the water cooling plate, and the collecting pipe is used for collecting and discharging the cooling water of the water cooling plate.

In a preferred embodiment, the two upper water cooling plates or the two lower water cooling plates located on both sides of a battery module are respectively connected to the distribution pipe and the collector through pipes, and the upper water cooling plates located on the same side of a battery module are connected to the The lower water cooling plate is connected to the distribution pipe or header through pipes.

In a preferred embodiment, each single battery cell is a cylindrical battery core and includes cylindrical side surfaces, and the cross section of the main body of each temperature spreader is wavy and surrounds part of the side surfaces of the single battery core.

In a preferred embodiment, the two ends of each temperature equalizing sheet are parallel to each other, and a thermal conductive coating is coated between the two layers of insulating heat conducting sheets located at the ends of each temperature equalizing sheet.

The battery pack heat dissipation structure with uniform temperature provided by the utility model, through the combination of the temperature uniform sheet and the water cooling plate, has a compact structure, short heat transfer distance, and high heat dissipation efficiency; The thermal film reduces the thermal influence between each single cell and achieves the purpose of uniformity and heat dissipation.

【Description of drawings】

Fig. 1 is a structural schematic diagram of a battery pack heat dissipation structure provided by the utility model.

FIG. 2 is a schematic structural diagram of a battery module in the battery pack heat dissipation structure shown in FIG. 1 .

FIG. 3 is a structural schematic diagram of a temperature equalizing plate in the temperature equalizing heat dissipation structure of the battery pack shown in FIG. 1 .

【Detailed ways】

In order to make the purpose, technical solution and beneficial technical effects of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementations described in this specification are only for explaining the utility model, not for limiting the utility model.

Please refer to FIG. 1 , the utility model provides a battery pack heat dissipation structure 100 , which includes a plurality of battery modules 10 , a plurality of water cooling plates 20 , a plurality of distribution pipes 30 and a plurality of collectors 40 . Each battery module group 10 is formed by a plurality of battery modules 11 arranged in series. A plurality of water-cooled plates 20 include an upper water-cooled plate 21 and a lower water-cooled plate 22 respectively arranged on both sides of each battery module 10, and an upper water-cooled plate 21 or a lower water-cooled plate 22 is connected with each battery in a battery module 10 One side of the module 11 is attached. Both ends of the upper water-cooling plate 21 are respectively provided with a distribution pipe 30, and both ends of the lower water-cooling plate 22 are respectively provided with a header 40, and the upper water-cooling plate 21 and the lower water-cooling plate 22 pass through the pipeline 23 respectively. It is connected to the distribution pipe 30 or the header pipe 40 to form a cooling water circuit.

An upper water cooling plate 21 and a lower water cooling plate 22 are shared between every two adjacent battery modules 10 , so that the overall structure is compact. The upper water cooling plates 21 located at both ends of the multiple battery modules 10 are connected to each distribution pipe 30 through pipes 23 ; the lower water cooling plates 22 located at both ends of the multiple battery modules 10 are connected to each header 40 through pipes 23 . The distribution pipe 30 is used for introducing cooling water and distributing it to the water cooling plate 20 , and the collecting pipe 40 is used for collecting and discharging the cooling water of the water cooling plate 20 . Two upper water cooling plates 21 or two lower water cooling plates 22 located on both sides of a battery module 10 are respectively connected to the distribution pipe 30 and the header 40 through pipes 23, and the upper water cooling plate 21 located on the same side of a battery module 10 The lower water cooling plate 22 is connected to the distribution pipe 30 or the header 40 through the pipe 23, so that the flow direction of the cooling water in the two upper water cooling plates 21 or the two lower water cooling plates 22 on both sides of each battery module 10 is opposite , and the flow direction of the cooling water in the upper water-cooled plate 21 and the lower water-cooled plate 22 located on the same side of a battery module 10 is opposite to avoid overheating of one end of the battery module 10 .

Please refer to FIG. 2 and FIG. 3 together. Each battery module 11 includes a plurality of single cells 111 and a plurality of temperature equalizing plates 112 interspersed between the plurality of single cells 111 . Each single cell 111 is a cylindrical cell and includes a cylindrical side. Each temperature equalizer 112 includes a main body 1121 with a wavy cross-section and end portions 1122 located at both ends of the main body 1121 , the main body 1121 of each temperature equalizer 112 is attached to the side of the adjacent single cell 111 and Wrap around some of the sides. Each temperature equalizing sheet 112 is formed by stacking two layers of insulating and heat conducting sheets 1123, and the main body 1121 of each temperature equalizing sheet 112 is sandwiched with a heat insulating film 1124 between the two layers of insulating and heat conducting sheets 1123, so as to weaken the The thermal influence between the single battery cells 111 on both sides of each temperature equalizing sheet 112. The ends 1122 at both ends of each temperature equalizer 112 are parallel and respectively abut against the water-cooled plates 20 on both sides of each battery module 11, which is beneficial to bidirectional heat conduction and improves heat dissipation efficiency; the ends 1122 of each temperature equalizer 112 A heat-conducting coating is applied between the two layers of insulating and heat-conducting sheets 1123, so that the two layers of insulating and heat-conducting sheets 1123 are tightly bonded to reduce heat conduction resistance.

The working principle of the present invention is that heat is generated when the single cell 111 is charged and discharged, and the heat is conducted to the water-cooled plate 20 through the temperature equalizer 112 . The cooling water enters the water-cooled plate 20 from the distribution pipe 30 for heat exchange, and then flows into the collector pipe 40 and discharges the heat of the cooling water to the outside of the battery pack to achieve the purpose of uniform temperature and heat dissipation of the battery pack.

The battery pack uniform temperature heat dissipation structure 100 provided by the utility model dissipates heat through the combination of the temperature uniform sheet 112 and the water-cooled plate 20, and has a compact structure, short heat transfer distance, and high heat dissipation efficiency; A heat insulation film 1124 is sandwiched between them to reduce the thermal influence between each single battery cell 111 and achieve the purpose of uniform temperature and heat dissipation.

The utility model is not limited to the description in the description and the implementation, so those skilled in the art can easily realize additional advantages and modifications, so without departing from the spirit and general concept defined by the claims and equivalent scope Without limitation, the invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein.

Claims (6)

1. A battery pack heat dissipation structure, including a plurality of battery modules arranged in sequence, a plurality of water cooling plates, a plurality of distribution pipes and a plurality of collectors; each battery module is arranged by a plurality of battery modules connected in series It is characterized in that: a plurality of water-cooled plates include an upper water-cooled plate and a lower water-cooled plate respectively arranged on both sides of each battery module, and an upper water-cooled plate or a lower water-cooled plate and each battery in a battery module One side of the module is attached; two ends of the upper water-cooled plate are respectively provided with a distribution pipe, and two ends of the lower water-cooled plate are respectively provided with a collector pipe, and the upper water-cooled plate and the lower water-cooled plate are respectively Connected to distribution pipes or headers to form a cooling water circuit; each battery module includes multiple single cells and multiple temperature equalizers interspersed between multiple single cells; each temperature equalizer includes a main body And the ends located at both ends of the main body, the main body of each temperature equalizer is attached to the side of the adjacent single cell; each temperature equalizer is made of two layers of insulating and heat conducting sheets, and each temperature equalizer The main part of the sheet is sandwiched with a heat insulating film between two layers of insulating and heat conducting sheets; the ends of each temperature equalizing sheet are respectively against the water cooling plates on both sides of the battery module. 2. The battery pack heat dissipation structure according to claim 1, characterized in that: every two adjacent battery modules share an upper water cooling plate and a lower water cooling plate; The upper water-cooling plate is connected to each distribution pipe through a pipe, and the lower water-cooling plate located at both ends of the multiple battery modules is connected to each header through a pipe. 3. The heat dissipation structure of the battery pack according to claim 2, characterized in that: the distribution pipe is used to introduce cooling water and distribute it to the water cooling plate, and the collecting pipe is used to collect and discharge the cooling water of the water cooling plate . 4. The battery pack heat dissipation structure according to claim 3, characterized in that: the two upper water cooling plates or the two lower water cooling plates located on both sides of a battery module are respectively connected to the distribution pipe and the collector pipe through pipes , the upper water-cooling plate and the lower water-cooling plate located on the same side of a battery module are connected to the distribution pipe or the header through pipes. 5. The battery pack heat dissipation structure according to claim 1, characterized in that: each single battery cell is a cylindrical battery cell and includes a cylindrical side, and the cross-section of the main body of each temperature spreader is It is wavy and wraps around part of the side of the cell. 6. The battery pack temperature equalizing heat dissipation structure according to claim 5, characterized in that: the ends of each temperature equalizer are parallel to each other and between the two layers of insulating and heat conducting sheets located at the ends of each temperature equalizer are coated with Has a thermally conductive coating.