CN209929443U - Battery pack heat exchange system - Google Patents

Abstract

The utility model discloses a battery pack heat exchange system, which comprises a liquid inlet pipe, a liquid outlet pipe, a heat exchange plate and a temperature equalizing plate, wherein for each battery module which is arranged in a single layer, each battery module is supported on the heat exchange plate; for the battery module whole body which is arranged in a multilayer mode, each battery module in the battery module whole body corresponds to one temperature equalizing plate respectively, each battery module in the battery module whole body is supported on the corresponding temperature equalizing plate, all the temperature equalizing plates supported below the same battery module whole body are connected in series to form a group of temperature equalizing plate whole body, and all the temperature equalizing plate whole bodies and all the heat exchange plates are connected in parallel between the liquid inlet pipe and the liquid outlet pipe. Adopt the utility model discloses can cool off and heat the battery module in the battery package, and consider the condition that battery module thermal field distributes in the battery package and guaranteed each battery module temperature field distribution homogeneity.

Description

Battery pack heat exchange system

technical field

The embodiments of the utility model relate to the technical field of electric vehicle accessories, in particular to a battery pack 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 the heat exchange plate cannot solve the problem of uneven temperature field distribution of the battery modules in the battery pack. In addition, the lithium battery has lithium precipitation due to charging at low temperature, and dendrite particles will be generated after electrochemistry to pierce the separator, resulting in an internal short circuit inside the battery. In severe cases, thermal runaway is caused. For this reason, we must heat the battery before charging at low temperature, so that the battery can quickly reach the working temperature range.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a battery pack heat exchange system, which solves the problem of heat dissipation of the battery module and the problem of uneven temperature field distribution, and simultaneously solves the problem of unstable performance of the battery module in a low temperature state.

The embodiment of the present invention provides a heat exchange system for a battery pack. The battery pack includes at least one battery module arranged in a single layer, and at least one group of battery modules formed by a plurality of battery modules is arranged in a multi-layer arrangement. The battery module as a whole, including the liquid inlet pipe, the liquid outlet pipe, the heat exchange plate and the temperature equalizing plate, for each battery module arranged in a single layer, each battery module is supported on the heat exchange plate; The battery modules are arranged as a whole, each battery module in the battery module as a whole corresponds to a temperature equalizing plate, and each battery module in the battery module as a whole is supported on the corresponding temperature uniform plate, and is supported on the same temperature plate. Each temperature equalizing plate under the whole battery module is connected in series to form a whole group of temperature equalizing plates, and the whole of each group of temperature equalizing plates and each heat exchange plate are connected in parallel between the liquid inlet pipe and the liquid outlet pipe.

Further, in the above battery pack heat exchange system, the sum error of the flow channel volume in a single heat exchange plate and the flow channel volume of each temperature equalizing plate in the whole temperature equalizing plate is less than 10%.

Further, in the above battery pack heat exchange system, wherein: the temperature equalizing plate 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 is divided into two parts from the liquid inlet to the flow channel A liquid inlet section is formed at one of the positions, 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.

Further, in the above battery pack heat exchange system, the cover plate is covered with thermally conductive silica gel.

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

Still further, in the above battery pack heat exchange system, wherein: the heat exchange plate includes a cover plate and a flow channel plate, a flow channel is formed on the flow channel plate, and the flow channel includes a straight section flow channel and a curved section flow channel. The straight section flow channels are distributed in parallel on the flow channel plate, the curved section flow channels are connected to the adjacent straight section flow channels, and the cover plate covers the flow channel plate.

Still further, in the above battery pack heat exchange system, the cover plate is covered with thermally conductive silica gel.

Still further, in the above battery pack heat exchange system, wherein: the bottom surface of the flow channel plate is provided with a buffer and heat insulation foam.

The substantive features and significant technical progress of the present utility model are reflected in: (1) The utility model can be used to cool the battery modules in the battery pack, and the thermal field distribution of the battery modules in the battery pack can be set up separately in consideration of the thermal field distribution of the battery packs. The exchange plate and the temperature equalizing plate ensure the uniformity of heat dissipation distribution in the temperature field of each battery module. (2) The utility model also adopts thermal fluid to transfer heat to the battery module by means of thermal conduction, so that the battery module can quickly reach work. The temperature range ensures that the battery module can work normally under cold conditions, and at the same time considers the thermal field distribution of the battery module in the battery pack, so that the battery heating temperature field distribution is more uniform.

Description of drawings

Figure 1 is a schematic diagram of the connection between the cooling and heating system and the battery pack;

Figure 2 is a schematic structural diagram of a cooling and heating system;

Figure 3 is a schematic diagram of a cooling and heating system circulation pipe;

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. The battery pack heat exchange system of the utility model 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 1d, and a first temperature equalizing plate. 2a, the second temperature uniformity plate 2b, the third temperature uniformity plate 2c, and the fourth temperature uniformity 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 battery module 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, the sixth battery The 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 of the present invention 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 small heat 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 The liquid outlet of the temperature plate 2b 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, and the first heat exchange plate The liquid outlets of 1b, 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 . For example, 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 and the first heat The series connection of the exchange plates 1b is regarded as a whole heat exchange plate. The first temperature uniformity plate 2a, the second temperature uniformity plate 2b, the third temperature uniformity plate 2c, and the fourth temperature uniformity plate 2d are connected in series to form a whole set of temperature uniformity plates. The heat exchange plate as a whole, the second heat exchange plate 1c , The third heat exchange plate 1d and the temperature equalizing plate are integrally connected in parallel between the liquid inlet pipe 3 and the liquid outlet pipe 4 .

Using the above technical solution, the principle is as follows: when cooling is required, 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 batteries arranged in a single layer The module 5 adopts the heat exchange plate 1 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 will cause insufficient heat dissipation, 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 installed with the liquid inlet pipe 3 and the liquid outlet pipe respectively. 4 connected pipe joints, however there is no space for the inlet and outlet pipe joints on each board. Therefore, the technical solution of the present invention is that, corresponding to each battery module 5 in the whole battery module arranged in multiple layers, a temperature equalizing plate 2 is arranged under it, and each temperature equalizing plate 2 is connected in series to distinguish it from a parallel thermal circuit. Switch board 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. Therefore, the temperature field around each battery module 5 will be unevenly distributed. Therefore, in the present invention, the temperature equalizing plate 2 adopted in series not only has the cooling function, but also has the temperature equalizing function. In order to ensure the uniformity of heat dissipation, the total error between the volume of the flow channel in a single heat exchange plate 1 and the volume of the flow channels of each temperature plate 2 in a group of the whole series of temperature chambers 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 . A return flow channel 231 is formed on the flow channel plate 23 , 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 solution is only a preferred solution, and the cooling system can be designed according to the arrangement of the battery modules 5 in the battery pack during the specific implementation. The battery pack contains at least one battery module 5 arranged in a single layer. , 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, a heat exchange plate 1 is laid 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 respectively, and a temperature equalizing plate 2 is laid under each battery module 5 in the battery module as a whole, and is supported on the The temperature-spreading plates 2 under the same group of battery modules are connected in series to form a whole group of temperature-spreading 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 groups of heat exchange plates 1 . The whole battery module with multi-layer arrangement is how many sets of temperature equalizing plates are there. Each temperature equalizing plate in each group is connected in series, and the whole temperature equalizing plate in each group is connected with each heat exchange plate 1 in parallel with the liquid inlet pipe. 3 and the outlet pipe 4.

In addition, the present invention can also heat the battery module 5 , so that the battery module 5 in the battery pack can be heated under cold conditions, so as to ensure the stability of the battery module 5 . It is only necessary to pass hot water from the liquid inlet pipe 3, and the heat exchange plate 1 becomes a heating plate, which can heat the battery module 5 under charging through heat exchange. The temperature equalization effect ensures the uniformity of the temperature field distribution around the battery modules 5 located on each temperature equalization plate 2 .

It can be seen from the above description that the battery module 5 in the battery pack can be cooled by the utility model, and the heat exchange plate 1 and the temperature equalizing plate 2 are respectively set in consideration of the thermal field distribution of the battery module in the battery pack, so as to ensure The uniformity of heat dissipation distribution in the temperature field of each battery module 5 is improved. In addition, the utility model also adopts thermal fluid to transfer heat to the battery module 5 by means of thermal conduction, so that the battery module 5 can quickly reach the working temperature range and ensure that the battery module 5 can reach the working temperature range quickly. Under these conditions, the battery module can work normally, and at the same time, the thermal field distribution of the battery module 5 in the battery pack is considered, so that the battery heating temperature field distribution is more uniform.

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 (8)

1. The utility model provides a battery package heat exchange system, including at least one battery module that is the individual layer and arranges in the battery package, at least a set of battery module that is the multilayer and arranges the formation that forms that is formed by a plurality of battery modules is whole, its characterized in that: the solar cell module heat exchanger comprises a liquid inlet pipe, a liquid outlet pipe, a heat exchange plate and a temperature-equalizing plate, wherein for each cell module which is arranged in a single layer, each cell module is supported on the heat exchange plate; for the battery module whole body which is arranged in a multilayer mode, each battery module in the battery module whole body corresponds to one temperature equalizing plate, each battery module in the battery module whole body is supported on the corresponding temperature equalizing plate, all the temperature equalizing plates supported below the same battery module whole body are connected in series to form a group of temperature equalizing plate whole body, and all the groups of temperature equalizing plate whole bodies and all the heat exchange plates are connected in parallel between the liquid inlet pipe and the liquid outlet pipe.

2. The battery pack heat exchange system of claim 1, wherein: the total error between the volume of the flow channel in the single heat exchange plate and the volume of the flow channel of each temperature-equalizing plate in the whole temperature-equalizing plate is less than 10 percent.

3. The battery pack heat exchange system of claim 1, wherein: the temperature-uniforming plate comprises a cover plate and a runner plate, wherein a clip-shaped runner is formed on the runner plate, a liquid inlet section is formed from a liquid inlet to one half of the runner, a liquid outlet section is formed from the tail end of the liquid inlet section to a liquid outlet of the runner, the liquid inlet section and the liquid outlet section are arranged in a staggered mode layer by layer, and the cover plate covers the runner plate.

4. The battery pack heat exchange system of claim 3, wherein: the cover plate is covered with heat-conducting silica gel.

5. The battery pack heat exchange system of claim 3, wherein: the bottom surface of the runner plate is provided with buffer heat insulation foam.

6. The battery pack heat exchange system of claim 1, wherein: the heat exchange plate comprises a cover plate and a runner plate, a runner is formed on the runner plate and comprises a straight-line section runner and a bending section runner, the straight-line section runner is distributed on the runner plate in parallel, the bending section runner is connected with the adjacent straight-line section runner, and the cover plate covers the runner plate.

7. The battery pack heat exchange system of claim 6, wherein: the cover plate is covered with heat-conducting silica gel.

8. The battery pack heat exchange system of claim 6, wherein: the bottom surface of the runner plate is provided with buffer heat insulation foam.

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