CN209929442U - Vaporizing plate for battery pack heat exchange system and its connection structure with heat exchange system - Google Patents

Abstract

The utility model discloses a temperature equalization plate for a heat exchange system of a battery pack and a connection structure thereof with the heat exchange system. The temperature equalization plate comprises a cover plate and a flow channel plate, and a return-shaped flow channel is formed on the flow channel plate. And the flow channel forms the liquid inlet section from the liquid inlet to the half of the flow channel, and forms the liquid outlet section from the end of the liquid inlet section to the liquid outlet of the flow channel, and the liquid inlet section and the liquid outlet section are staggered layer by layer. The cover plate is covered on the flow channel plate, and each temperature equalization plate is connected in series to form a whole temperature equalization plate, and the whole temperature equalization plate and the heat exchange plate of the heat exchange system are connected in parallel between the liquid inlet pipe and the liquid outlet pipe. The utility model adopts the utility model to cool or heat the battery modules in the battery pack, and the heat exchange plate and the temperature equalizing plate are respectively set in consideration of the thermal field distribution of the battery modules in the battery pack, so as to ensure that each battery module is Uniformity of temperature field distribution.

Description

Vaporizing plate for battery pack heat exchange system and its connection structure with heat exchange system

technical field

The embodiments of the utility model relate to the technical field of electric vehicle accessories, in particular to a temperature equalizing plate for a heat exchange system of a battery pack and a connection structure thereof with the heat exchange system.

Background technique

The temperature factor is an important factor affecting the performance and life of lithium batteries. Since the battery module in the battery pack of a new energy vehicle will inevitably generate heat during the charging and discharging process, in the field of lithium batteries, a water-cooling plate is usually installed in the battery pack to improve the heat dissipation efficiency of the lithium battery. However, due to the limitation of the space inside the battery pack, some battery modules are arranged in a single layer, and some battery modules are arranged in multiple layers. Compared with the battery modules arranged in a single layer, they are arranged in multiple layers. The heat generated by the surrounding of the cloth battery module must be greater than that of the single-layer arrangement. Therefore, simply using a water cooling plate cannot solve the problem of uneven temperature field distribution of the battery modules in the battery pack.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a temperature equalizing plate for a battery pack heat exchange system and a connection structure thereof with the heat exchange system, so as to solve the problem of heat dissipation of the battery module and the problem of uneven temperature field distribution.

The embodiment of the present utility model provides a temperature equalizing plate for a battery pack heat exchange system, which includes a cover plate and a flow channel plate. The flow channel plate is formed with a return-shaped flow channel, and the flow channel extends from the liquid inlet to the flow channel. A liquid inlet section is formed at half of the liquid inlet section, and a liquid outlet section is formed from the end of the liquid inlet section to the liquid outlet of the flow channel. The liquid inlet section and the liquid outlet section are staggered layer by layer, and the cover plate covers the flow channel plate.

Further, in the above-mentioned temperature equalizing plate for a heat exchange system of a battery pack, the cover plate is covered with thermally conductive silica gel.

Further, in the above-mentioned temperature equalizing plate for a heat exchange system of a battery pack, wherein: the bottom surface of the flow channel plate is provided with a buffer and heat insulation foam.

The utility model also discloses a connection structure between a temperature equalizing plate and a heat exchange system. The heat exchange system includes at least one heat exchange plate, a liquid inlet pipe and a liquid outlet pipe. The temperature equalizing plate is provided with multiple pieces, and The temperature equalization plates are grouped to form at least one group of temperature equalization plates as a whole, and each temperature equalization plate located in the same group of temperature uniformity plates is connected in series, and the whole temperature equalization plates of each group and each heat exchange plate are connected in parallel with the liquid inlet pipe. and the outlet pipe.

The substantive features and significant technical progress of the present utility model are reflected in: the utility model can be used to cool or heat the battery modules in the battery pack, and the heat exchange can be set separately in consideration of the thermal field distribution of the battery modules in the battery pack. Plate and temperature uniformity plate to ensure the uniformity of temperature field distribution of each battery module.

Description of drawings

1 is a schematic diagram of the connection between the heat exchange system and the battery pack;

Figure 2 is a schematic structural diagram of a heat exchange system;

Fig. 3 is the schematic diagram of the flow pipe of the heat exchange system;

Fig. 4 is the schematic diagram of the circulation pipeline of Fig. 2;

Figure 5 is a schematic structural diagram of a heat exchange plate;

Figure 6 is a schematic diagram of the structure of a temperature equalizing plate;

FIG. 7 is a schematic diagram of the flow channel of the uniform temperature plate.

Description of reference numerals: 1, heat exchange plate; 1a, small heat exchange plate; 1b, first heat exchange plate; 1c, second heat exchange plate; 1d, third heat exchange plate; 2a, first temperature equalizing plate; 2b, second temperature chamber; 2c, third chamber; 2d, fourth chamber; 11, thermally conductive silica gel; 12, cover plate; 13, flow channel plate; 131, flow channel; 14, buffer heat insulation Foam; 2. Temperature plate; 21. Thermally conductive silica gel; 22. Cover plate; 23. Flow channel plate; 231, Flow channel; 2311, Liquid inlet section; 2312, Liquid outlet section; , liquid inlet pipe; 4, liquid outlet pipe; 5, battery module; 5a, small battery module; 5b, first battery module; 5c, second battery module; 5d, third battery module; 5e, The fourth battery module; 5f, the fifth battery module; 5g, the sixth battery module; 5h, the seventh battery module.

Detailed ways

Exemplary embodiments of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in use, and is only for the convenience of describing the application and simplifying the description, rather than indicating or It is implied that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present application. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance.

As shown in FIG. 1 , the battery module 5 includes a small battery module 5a, a first battery module 5b, a second battery module 5c, a third battery module 5d, a fourth battery module 5e, and a fifth battery module 5f, the sixth battery module 5g and the seventh battery module 5h, wherein the small battery module 5a, the first battery module 5b, the second battery module 5c, and the third battery module 5d are all arranged in a single layer, The fourth battery module 5e, the fifth battery module 5f, the sixth battery module 5g and the seventh battery module 5h form a double-layered battery module as a whole. Correspondingly, as shown in FIG. 2, the battery The package heat exchange system includes a liquid inlet pipe 3, a liquid outlet pipe 4, a small heat exchange plate 1a, a first heat exchange plate 1b, a second heat exchange plate 1c, a third heat exchange plate The second temperature equalization plate 2b, the third temperature equalization plate 2c, and the fourth temperature equalization plate 2d, the small battery module 5a is placed above the small heat exchange plate 1a, the first battery module 5b, the second battery module 5c, the third The three battery modules 5d are respectively placed above the first heat exchange plate 1b, the second heat exchange plate 1c, and the third heat exchange plate 1d, the fourth battery module 5e, the fifth battery module 5f, and the sixth battery module 5g and the seventh battery module 5h are respectively placed above the first temperature equalization plate 2a, the second temperature equalization plate 2b, the third temperature equalization plate 2c, and the fourth temperature equalization plate 2d.

As shown in Figures 3 and 4, the lower liquid inlet pipe 3 is communicated with the liquid inlets of the small heat exchange plate 1a, the second heat exchange plate 1c, the third heat exchange plate 1d and the first temperature equalizing plate 2a. The liquid outlet of the exchange plate 1a is communicated with the liquid inlet of the first heat exchange plate 1b, the liquid outlet of the first temperature equalization plate 2a is communicated with the liquid inlet of the second temperature equalization plate 2b, and the second temperature equalization plate 2b The liquid outlet is communicated with the liquid inlet of the third temperature equalization plate 2c, the liquid outlet of the third temperature equalization plate 2c is communicated with the liquid inlet of the fourth temperature equalization plate 2d, the first heat exchange plate 1b, the third The liquid outlets of the second heat exchange plate 1c, the third heat exchange plate 1d and the fourth temperature equalizing plate 2d are all communicated with the liquid outlet pipe 4 . Under high temperature conditions, each battery module in the battery pack needs to be cooled. Since the small battery module 5a generates less heat, as shown in FIG. 4, the small heat exchange plate 1a can be exchanged with the first heat exchange The series connection of the plates 1b is regarded as a whole heat exchange plate, and the first temperature equalization plate 2a, the second temperature equalization plate 2b, the third temperature equalization plate 2c, and the fourth temperature equalization plate 2d are connected in series to form a group of temperature equalization plates as a whole. The whole heat exchange plate, the second heat exchange plate 1c, the third heat exchange plate 1d and the temperature equalizing plate are connected in parallel between the liquid inlet pipe 3 and the liquid outlet pipe 4 as a whole.

Using the above technical solution, the principle is as follows: the cooling liquid flows in through the liquid inlet pipe 3, and the cooling liquid flows out from the liquid outlet pipe 4 after passing through the heat exchange plate 1 and the temperature equalizing plate 2. For the battery modules 5 arranged in a single layer, the The heat exchange plate 1 is connected in parallel between the liquid inlet pipe 3 and the liquid outlet pipe 4 to cool down. For the battery modules arranged in multiple layers as a whole, each battery module 5 is stacked close to each other, so the heat is higher than that of the battery modules 5 arranged in a single layer. The same as the first to third heat exchange plates The structure can not fully dissipate heat, and because the battery modules 5 are stacked close to each other, if the heat exchange plates are connected in parallel, each heat exchange plate will be connected to the liquid inlet pipe 3 and the liquid outlet pipe 4 respectively. However, there is no space for the inlet and outlet pipe joints on each board. Therefore, each battery module 5 in the whole battery module arranged in multiple layers is provided with a temperature equalizing plate 2 below, and each temperature equalizing plate 2 is connected in series, which is different from the parallel heat exchange plate 1 . Due to the series connection mode, if the heat exchange plates 1 are connected in series, the cooling liquid passes through the heat exchange plates at all levels. Since heat exchange occurs every time it passes through the heat exchange plates, the temperature of the cooling liquid in the heat exchange plates at the latter stage will be high. The temperature field around each battery module 5 is unevenly distributed due to the heat exchange plate in the previous stage. The temperature equalization plate 2 connected in series not only has a cooling function but also has a temperature equalization function. In order to ensure the uniformity of heat dissipation, the total error between the flow channel area of a single heat exchange plate 1 and the flow channel volume of each temperature uniform plate 2 in the whole of each temperature uniform plate 2 in series is less than 10%. The overall flow channel volume of the heat exchange plate 1 and the temperature equalization plate is similar, which ensures that the heat dissipation is similar, so that the temperature of each battery module 5 does not differ too much.

Specifically, as shown in FIG. 3 and FIG. 5 , the heat exchange plate 1 includes thermally conductive silica gel 11 , a cover plate 12 , a flow channel plate 13 and a buffer insulation foam 14 , and a flow channel 131 is formed on the flow channel plate 13 . 131 includes a straight section flow channel and a curved section flow channel, the straight section flow channel is distributed on the flow channel plate 13 in parallel, and the curved section flow channel connects adjacent straight section flow channels. The cover plate 12 covers the flow channel plate 13 , the thermally conductive silica gel 11 covers the cover plate 12 , and the buffer and heat insulation foam 14 is bonded to the bottom surface of the flow channel plate 13 .

As shown in FIG. 6 and FIG. 7 , the temperature equalizing plate 2 includes thermally conductive silica gel 21 , a cover plate 22 , a flow channel plate 23 and a buffer and thermal insulation foam 24 , and a flow channel 231 is formed on the flow channel plate 23 . 23 is formed with a back-shaped flow channel 231, and the flow channel 231 forms a liquid inlet section 2311 from the liquid inlet to half of the flow channel 231, and forms a liquid outlet section from the end of the liquid inlet section 2311 to the liquid outlet of the flow channel, The liquid inlet section 2311 and the liquid outlet section 2322 are staggered layer by layer in the formed return-shaped flow channel. The cover plate 22 covers the flow channel plate 23 , the thermally conductive silica gel 21 covers the cover plate 22 , and the buffer and heat insulation foam 24 is bonded to the bottom surface of the flow channel plate 23 . The principle of the temperature equalizing plate is: the temperature of the cooling liquid in the liquid inlet section is relatively low, and the temperature of the cooling liquid in the liquid outlet section is relatively high due to the heat exchange of the cooling liquid in the liquid inlet section, and the liquid inlet section and the liquid outlet section are staggered. , which can cause heat exchange between the adjacent liquid inlet and outlet sections during convection, so as to achieve the effect of uniform temperature.

It should be noted here that the above technical solutions are only preferred solutions, and the heat exchange system can be designed according to the arrangement of the battery modules 5 in the battery pack. The battery pack contains at least one battery module arranged in a single layer. 5. At least one group of battery modules composed of a plurality of battery modules 5 in a multi-layer arrangement as a whole, for each battery module 5 arranged in a single layer, lay a heat exchange plate 1 under each battery module 5 , For the battery module as a whole in a multi-layer arrangement, each battery module 5 in the battery module as a whole corresponds to a temperature equalizing plate 2, and the temperature uniformity plate 2 is laid under each battery module 5 in the battery module as a whole to support The temperature equalization plates 2 under the same group of battery modules are connected in series to form a whole group of temperature equalization plates. Therefore, the number of battery modules 5 arranged in a single layer means the number of heat exchange plates 1 and the number of sets of heat exchange plates 1 . The battery module as a whole arranged in multiple layers is how many sets of temperature equalizing plates as a whole. Each temperature equalizing plate in each group is connected in series, and each group of temperature equalizing plates is connected in parallel with each heat exchange plate 1 in parallel with the liquid inlet. Between pipe 3 and outlet pipe 4.

In addition, in some cold regions, the battery module 5 needs to be heated, and hot water is introduced from the liquid inlet pipe 3, and the heat exchange plate 1 plays a heating role to heat the battery module 5 in the charging state to ensure that The working stability of the battery module 5. Similarly, the temperature equalization plate 2 can play the role of heating and temperature equalization, so as to ensure that the temperature field around the battery modules 5 located on each temperature equalization plate 2 is evenly distributed.

It can be seen from the above description that the battery module 5 in the battery pack can be cooled or heated by using the present invention, and the heat exchange plate 1 and the temperature equalization plate 2 are respectively set in consideration of the thermal field distribution of the battery module in the battery pack. , ensuring the uniformity of the temperature field distribution of each battery module 5 .

Of course, the above are only typical examples of the present utility model. In addition, the present utility model can also have other various specific embodiments. All technical solutions formed by equivalent replacement or equivalent transformation are all within the scope of the present utility model. within the range.

Claims (4)

1. A temperature equalizing plate for a battery pack heat exchange system, characterized in that: it comprises a cover plate and a flow channel plate, and the flow channel plate is formed with a back-shaped flow channel, and the flow channel is from the liquid inlet to the flow channel two. A liquid inlet section is formed at one part of the liquid inlet section, and a liquid outlet section is formed from the end of the liquid inlet section to the liquid outlet of the flow channel. The liquid inlet section and the liquid outlet section are alternately arranged layer by layer, and the cover plate covers the flow channel plate. 2 . The temperature equalizing plate for a battery pack heat exchange system according to claim 1 , wherein the cover plate is covered with thermally conductive silica gel. 3 . 3 . The temperature equalizing plate for a battery pack heat exchange system according to claim 1 , wherein the bottom surface of the flow channel plate is provided with buffering and heat insulating foam. 4 . 4. A connection structure of a temperature equalizing plate and a heat exchange system, characterized in that: the heat exchange system comprises at least one heat exchange plate, a liquid inlet pipe and a liquid outlet pipe, and the temperature equalization plate is provided with multiple pieces, and The temperature equalization plates are grouped to form at least one group of temperature equalization plates as a whole, and each temperature equalization plate located in the same group of temperature uniformity plates is connected in series, and the whole temperature equalization plates of each group and each heat exchange plate are connected in parallel with the liquid inlet pipe. and the outlet pipe.

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