CN220491966U - Battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries and discloses a battery pack, which comprises a battery and a heat exchange plate, wherein the heat exchange plate is attached to the battery, the heat exchange plate comprises a plurality of heat exchange medium channels which are arranged at intervals along a first direction, and the opposite ends of the heat exchange plate along a second direction are respectively provided with a heat exchange medium inlet and a heat exchange medium outlet, wherein the first direction is intersected with the second direction, the heat exchange medium channels comprise a first flow channel and a liquid outlet flow channel, and the heat exchange medium inlet, the first flow channel, the liquid outlet flow channel and the heat exchange medium outlet are sequentially communicated along the first direction; the total flow area of the liquid outlet channels is larger than that of the first channels. According to the battery pack, the total flow area of the liquid outlet channels is larger than that of the first channel, so that the problem of uneven heat exchange effect is solved.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

Thermal management is the process of adjusting and controlling the temperature or temperature difference thereof by heating or cooling means according to the requirements of specific objects. The battery pack releases a certain amount of energy when charged or discharged, and therefore, it is necessary to cool the battery pack. In the low-temperature environment of the battery pack, electrolyte of the battery pack is sticky, so that internal resistance of a lithium battery in the battery pack is increased, and negative electrode materials are seriously polarized, so that lithium ion deposition, coating phenomena and the like are caused, usable capacity and discharge rate of the lithium battery are reduced, the energy released by the lithium ion battery along with temperature reduction is reduced, capacity is reduced, voltage is reduced, and finally battery endurance is greatly reduced. Therefore, the battery pack needs to be heated. Cooling or heating the battery pack is the thermal management of the battery pack. The battery pack is provided with a heat exchange plate, the battery is attached to the heat exchange plate, a heat exchange medium channel is arranged in the heat exchange plate, and the heat exchange medium channel is filled with heat exchange medium, so that the battery is cooled or heated, and the purpose of heat management of the battery is achieved. The heat exchanger plates are the key to the thermal management component.

The heat exchange medium channel design of the conventional geothermal heat exchange plate from the heat exchange medium inlet to the heat exchange medium outlet is uniform, the longer the flowing distance of the heat exchange medium in the heat exchange medium channel is, the larger the temperature change of the heat exchange medium is, and the worse the heat exchange capacity is, so that the heat exchange medium positioned at the tail end of the flowing direction obviously worsens the heat management effect of the battery along the flowing direction of the heat exchange medium, and further the heat management effect of the battery is uneven, which is unfavorable for the stable performance and the service life of the battery.

Disclosure of Invention

The utility model aims to provide a battery pack so as to solve the problems of unreasonable structure of a heat exchange plate flow channel and uneven heat management effect in the existing battery pack.

In order to achieve the above object, the present utility model provides a battery pack comprising a battery and a heat exchange plate attached to the battery,

the heat exchange plate comprises at least one heat exchange medium channel, a plurality of heat exchange medium channels are arranged at intervals along a first direction, and a heat exchange medium inlet and a heat exchange medium outlet are respectively arranged at two opposite ends of the heat exchange plate along a second direction, wherein the first direction is intersected with the second direction, the heat exchange medium channel comprises a first runner and a second runner, and the heat exchange medium inlet, the first runner, the second runner and the heat exchange medium outlet are sequentially communicated along the second direction;

the total flow area of the plurality of second flow channels is greater than the total flow area of the first flow channels.

Preferably, each heat exchange medium channel comprises a first flow channel and a plurality of second flow channels, two adjacent second flow channels are arranged at intervals along the first direction, and the first flow channels are communicated with the plurality of second flow channels.

Preferably, each second flow passage comprises a plurality of sub-flow sections along the second direction, each sub-flow section comprises a plurality of sub-flow passages, the sub-flow passages of two adjacent sub-flow sections in the second direction are communicated, the number of the sub-flow passages of the sub-flow sections increases from section to section along the second direction towards one end of the heat exchange medium outlet, and the total flow area of the sub-flow sections increases from section to section along the second direction towards one end of the heat exchange medium outlet.

Preferably, one of the sub-flow passages of the sub-flow section communicates with a plurality of the sub-flow passages of an adjacent sub-flow section adjacent to the heat exchange medium outlet.

Preferably, the widths of the plurality of sub-flow channels decrease segment by segment along the second direction, and the pitches of the plurality of sub-flow channels between the first directions decrease segment by segment along the second direction.

Preferably, the distance between two adjacent second flow channels in the first direction is smaller than the distance between two adjacent first flow channels in the first direction.

Preferably, two opposite ends of the heat exchange plate along the second direction are respectively provided with a heat exchange medium inflow groove and a heat exchange medium outflow groove which extend along the first direction, a plurality of first flow passages are communicated with the heat exchange medium inlet through the heat exchange medium inflow groove, and a plurality of second flow passages are communicated with the heat exchange medium outlet through the heat exchange medium outflow groove.

Preferably, the heat exchange plate comprises a cover plate and a base plate, the cover plate and the base plate are in sealing connection to form the heat exchange plate, the cover plate is provided with the heat exchange medium channel, or

The base plate is provided with the heat exchange medium channel, or

The opposite surfaces of the base plate and the cover plate are respectively provided with the heat exchange medium channel.

Preferably, the height H of the heat exchange medium channel accounts for 50% -75% of the total thickness H of the heat exchange plate in the third direction.

Preferably, the heat exchange plate further comprises a first joint communicating with the first flow channel through the heat exchange medium inlet and a second joint communicating with the second flow channel through the heat exchange medium outlet.

Preferably, the solar cell module further comprises a box body, wherein the box body is provided with a containing cavity, and the battery and the heat exchange plate are arranged in the containing cavity; or (b)

The frame body, the frame body with the heat exchange plate jointly prescribes a limit to hold the chamber, the battery is located hold the intracavity.

Compared with the prior art, the utility model provides a battery pack, which has the beneficial effects that: the battery pack comprises a battery and a heat exchange plate, the heat exchange plate is attached to the battery, and the heat exchange plate is attached to the battery due to the fact that a heat exchange medium is arranged in the heat exchange plate, and heat exchange is carried out between the battery and the heat exchange medium in the heat exchange plate, so that heat management of the battery pack is achieved. The heat exchange plate comprises at least one heat exchange medium channel, the opposite ends of the heat exchange plate along the second direction are respectively provided with a heat exchange medium inlet and a heat exchange medium outlet, the heat exchange medium inlet is used for entering heat exchange medium, the heat exchange medium outlet is used for flowing out of the heat exchange medium, the heat exchange medium enters the heat exchange medium channel at the heat exchange medium inlet, the heat exchange medium is discharged from the heat exchange medium outlet after heat exchange is carried out on the heat exchange medium in the heat exchange medium channel, the heat exchange medium flows through the heat exchange medium inlet, the heat exchange medium channel and the heat exchange medium outlet to realize the flow circulation of the heat exchange medium, the opposite ends of the heat exchange medium inlet and the heat exchange medium outlet along the second direction are arranged to ensure the heat management coverage area of the heat exchange medium channel along the second direction, the heat management effect of the heat exchange medium channel of the battery is ensured, the heat exchange medium channel comprises a first flow channel and a second flow channel, the heat exchange medium inlet, the first flow channel, the second flow channel and the heat exchange medium outlet are sequentially communicated along the second direction, and the heat exchange medium flows out of the heat exchange medium outlet from the heat exchange medium inlet after entering the second flow channel from the first flow channel, so as to form a complete heat exchange medium circulation path through the heat exchange medium channel, and complete heat exchange medium circulation path is realized. The total flow area of the plurality of second flow channels is greater than the total flow area of the first flow channels. When the heat exchange medium enters the first flow passage from the heat exchange medium inlet, the heat exchange between the heat exchange medium and the battery is less, so that the heat management effect of the heat exchange medium in the first flow passage is better. After the heat exchange medium passes through the first flow channel, partial heat exchange is carried out between the heat exchange medium and the battery in the first flow channel, so that the heat exchange capacity of the heat exchange medium entering the second flow channel is reduced, the total flow area of the second flow channel is larger than that of the first flow channel by increasing the total flow area of the second flow channel, the heat absorption area of the second flow channel is increased, the heat absorption capacity of the heat exchange medium in the second flow channel is improved, the technical problem that the heat exchange medium channel has large difference in heat management effect between the heat exchange medium inlet end and the heat exchange medium outlet end is solved, the overall heat management effect of the heat exchange plate in the second direction is uniform, and the overall heat management effect of the battery is more uniform.

Drawings

Fig. 1 is a schematic overall structure of an embodiment of the present utility model.

Fig. 2 is an exploded view of a heat exchanger plate according to an embodiment of the present utility model.

Fig. 3 is a schematic structural diagram of a substrate according to an embodiment of the utility model.

Fig. 4 is a schematic structural diagram of a heat exchange medium channel according to an embodiment of the present utility model.

FIG. 5 is a cross-sectional view taken at A-A in FIG. 3 in accordance with the present utility model;

FIG. 6 is a cross-sectional view taken at B-B in FIG. 3 in accordance with the present utility model;

FIG. 7 is an enlarged schematic view of the structure of the present utility model at C in FIG. 5;

FIG. 8 is an enlarged schematic view of the structure of the present utility model at D in FIG. 6;

FIG. 9 is a structural comparison of FIGS. 5 and 6 in accordance with the present utility model;

fig. 10 is a schematic structural diagram of a cover plate according to an embodiment of the utility model.

Fig. 11 is a cross-sectional view showing the internal structure of a substrate according to an embodiment of the present utility model.

Fig. 12 is an enlarged schematic view of the structure at a in fig. 6 according to an embodiment of the present utility model.

In the figure:

100. a heat exchange plate; 200. a battery;

1. a cover plate; 11. a heat exchange medium inlet; 12. a heat exchange medium outlet;

2. a substrate; 20. a heat exchange medium channel; 201. a first flow passage; 202. a second flow passage; 2021. a substream segment; 2022. a sub-runner; 21. the heat exchange medium flows into the groove; 22. heat exchange medium outflow groove

3. A first joint; 4. a second joint;

x, a first direction; y, second direction; z, the second direction.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application.

Referring to fig. 1 to 12 together, the embodiment of the utility model provides a battery pack, which includes a battery 200 and a heat exchange plate 100, wherein the heat exchange plate 100 is attached to the battery 200, and it should be noted that the heat exchange plate 100 may be attached to one side of the battery 200 or may be attached to multiple sides of the battery 200, and the heat exchange plate 100 may be attached to the battery 200 due to the heat exchange medium flowing through the heat exchange plate 100, and the heat exchange plate 100 exchanges heat with the battery 200 to realize thermal management of the battery 200.

As shown in fig. 2 to 3, the heat exchange plate 100 includes at least one heat exchange medium channel 20, wherein when there are a plurality of heat exchange medium channels 20, two adjacent heat exchange medium channels 20 are disposed at intervals along the first direction X. The plurality of heat exchange medium channels 20 are arranged at intervals in the first direction X, so that the heat exchange coverage area of the heat exchange medium channels 20 in the first direction X of the heat exchange plate 100 is larger, and the thermal management effect on the battery 200 in the first direction X is improved. The opposite ends of the heat exchange plate 100 along the second direction Y are respectively provided with a heat exchange medium inlet 11 and a heat exchange medium outlet 12, the heat exchange medium inlet 11 is used for entering heat exchange medium, the heat exchange medium outlet 12 is used for flowing out of the heat exchange medium, the heat exchange medium enters the heat exchange medium channel 20 at the heat exchange medium inlet 11, after the heat exchange medium channel 20 exchanges heat with the battery 200, the heat exchange plate 100 is discharged through the heat exchange medium outlet 12, the heat exchange medium is sequentially communicated along the second direction Y through the heat exchange medium inlet 11, the heat exchange medium channel 20 and the heat exchange medium outlet 12, the opposite ends of the heat exchange medium inlet 11 and the heat exchange medium outlet 12 along the second direction Y are arranged so as to ensure the coverage area of the heat exchange medium channel 20 in the second direction Y, the arrangement of the heat exchange medium channel 20 is ensured in the second direction Y, the heat management effect of the battery 200 in the second direction Y is ensured, the heat exchange medium channel 20 comprises a first flow channel 201 and a second flow channel 202, the heat exchange medium inlet 11, the first flow channel 201, the second flow channel 202 and the heat exchange medium outlet 12 are sequentially communicated along the second direction Y, the heat exchange medium flows out of the heat exchange medium inlet 201 from the heat exchange medium inlet 201 and the second flow channel 100, and the heat exchange medium flows out of the heat exchange medium through the heat exchange medium outlet 12, and the heat exchange medium flows through the heat exchange medium channel 100, and the whole circulation path is realized. The first direction X intersects with the second direction Y, and a plurality of heat exchange medium channels 20 are arranged at intervals in the first direction X, and the second direction Y extends to the heat exchange medium channels 20, so that the heat management effect of the battery 200 is ensured in both directions, and the heat management capability of the battery 200 is improved.

As shown in fig. 2 to 3, the total flow area of the plurality of second flow channels 202 is larger than the total flow area of the first flow channels 201. When the first flow channels 201 are plural, the total flow area of the second flow channels 202 is larger than the total flow area of the first flow channels 201. Fig. 5 is a cross-sectional view at A-A in fig. 3, to show that a plurality of first flow channels 201 are arranged at intervals in a first direction X, and flow areas of the plurality of first flow channels 201 are marked in the figure, wherein a total flow area of the first flow channels 201 is a sum of flow areas of the plurality of first flow channels. Fig. 7 is an enlarged view of fig. 5 at C, and the blank space denoted 201 in fig. 7 is a flow area of the first flow channel 201. Fig. 6 is a cross-sectional view at B-B in fig. 3 to show that a plurality of second flow channels 202 are arranged at intervals in the first direction X, fig. 8 is an enlarged structural view at D in fig. 6, the blank area denoted 202 in fig. 8 is the flow area of one second flow channel 202, and the total flow area of the second flow channels is the sum of the flow areas of the plurality of second flow channels in fig. 6. As shown in fig. 9, taking one heat exchange medium passage 20 as an example, one heat exchange medium passage includes one first flow passage 201 and two second flow passages 202, and in the case where the first flow passage 201 and the second flow passage 202 are identical in the third direction Z, the widths of the two second flow passages 202 in the first direction X are larger than the widths of the first flow passage 201 in the first direction, and thus, the total flow area of the two second flow passages is larger than the total flow area of the first flow passage. Wherein the calculation method of the "total flow area" referred to herein is the same.

When the battery 200 needs to be cooled, the heat exchange medium is a low-temperature fluid, the low-temperature fluid enters from the heat exchange medium inlet 11, and the first flow channel 201 is communicated with the heat exchange medium inlet 11, and at this time, the temperature of the low-temperature fluid is low, so that the cooling effect in the first flow channel 201 is good. When the low-temperature fluid passes through the first flow channel 201, part of the heat of the battery 200 is absorbed in the first flow channel 201, and then the temperature of the low-temperature fluid passing through the first flow channel 201 is higher than the temperature at the heat exchange medium inlet 11, so that the heat absorption capacity of the low-temperature fluid entering the second flow channel 202 is reduced relative to the low-temperature fluid of the first flow channel 201, the total flow area of the second flow channel 202 is increased, the total flow area of the second flow channel 202 is larger than the total flow area of the first flow channel 201, the heat absorption contact area of the second flow channel 202 is increased, the heat absorption capacity of the low-temperature fluid of the second flow channel 202 is increased, and the technical problem that the difference of the cooling effect of the heat exchange medium channel 20 at the heat exchange medium inlet 11 end and the heat exchange medium outlet 12 end is large is solved, so that the overall cooling effect of the heat exchange plate 100 in the second direction Y is uniform, and the whole heat dissipation effect of the battery 200 is more uniform. As an embodiment, the low-temperature fluid is a cooling liquid, such as an ice-water mixture, and the heat exchange medium only needs to cool the battery.

When the battery 200 needs to be heated, the heat exchange medium is a high-temperature fluid, the high-temperature fluid enters from the medium inlet 11, and the first flow channel 201 is communicated with the heat exchange medium inlet 11, at this time, the temperature of the high-temperature fluid is higher, so that the heating effect of the high-temperature fluid in the first flow channel 201 is better. When the high-temperature fluid passes through the first flow channel 201, part of heat is transferred to the battery 200 in the first flow channel 201, and then the temperature of the high-temperature fluid passing through the first flow channel 201 is reduced relative to the temperature at the heat exchange medium inlet 11, so that the heating capacity of the high-temperature fluid entering the second flow channel 202 relative to the high-temperature fluid of the first flow channel 201 is reduced, the total flow area of the second flow channel 202 is increased by increasing the total flow area of the second flow channel 202, the total flow area of the second flow channel 202 is larger than the total flow area of the first flow channel 201, the heating area of the second flow channel 202 is increased, the heating capacity of the high-temperature fluid of the second flow channel 202 is increased, and the technical problem that the difference of the heating effect of the heat exchange medium channel 20 at the heat exchange medium inlet 11 end and the heat exchange medium outlet 12 end is large is solved, the overall heating effect of the heat exchange plate 100 in the second direction Y is uniform, and the overall temperature difference of the battery 200 is small. As an embodiment, the high-temperature fluid is water with a higher temperature, and the heat exchange medium only needs to heat the battery.

Further, as shown in fig. 2 to 3, after the heat exchange medium exchanges heat in the first flow channels 201 in the heat exchange medium channel 20, the heat exchange capacity of the heat exchange medium decreases after entering the second flow channels 202, and the heat exchange medium channel 20 includes one first flow channel 201 and a plurality of second flow channels 202, so that the number of second flow channels 202 is increased to be greater than that of the first flow channels 201, and adjacent second flow channels 202 are arranged at intervals along the first direction X, so that the position distribution of the second flow channels 202 in the first direction X of the heat exchange plate 100 is more uniform. The first flow channels 201 are communicated with the plurality of second flow channels 202, so that the heat exchange medium in the first flow channels 201 is split in the second flow channels 202, the heat exchange medium in the first flow channels 201 is split into the plurality of second flow channels 202, the heat exchange medium is further uniformly distributed in the plurality of second flow channels 202, and the uniformity of the distribution of the heat exchange medium in the heat exchange plate 100 is ensured. As an example, the first flow channels 201 in adjacent heat exchange medium channels 20 are respectively connected to different second flow channels 202, or one second flow channel 202 is respectively communicated with two adjacent first flow channels 201.

Further, as shown in fig. 4, the second flow channel 202 includes a plurality of sub-flow sections 2021 along the second direction Y, the sub-flow sections 2021 include a plurality of sub-flow sections 2022, two adjacent sub-flow sections 2021 in the second direction Y are communicated, the number of sub-flow sections 2022 of the sub-flow sections 2021 increases from section to section along the second direction Y, and the total flow area of the sub-flow sections 2021 increases from section to section along the second direction Y. The second flow passage 202 forms a plurality of sub-flow sections 2021 along the second direction Y, the sub-flow sections 2021 include a plurality of sub-flow passages 2022, and since the number of the sub-flow passages 2022 increases gradually along the second direction Y, the more the sub-flow sections 2022 of the sub-flow sections 2021 are closer to one end of the heat exchange medium outlet 12, the more the sub-flow passages 2022 of the sub-flow sections 2021 are closer to one end of the heat exchange medium outlet 12, so as to improve the heat dissipation capability of the heat exchange medium channel 20 close to one end of the heat exchange medium outlet 12, and improve the overall heat dissipation uniformity of the heat exchange medium channel 20.

As an example of this, two sub-flow sections 2021 adjacent in the second direction Y, the sub-flow section 2021 near the heat exchange medium outlet 12 is a lower sub-flow section, the sub-flow section 2021 near the heat exchange medium inlet 11 is an upper sub-flow section, and the number of sub-flow passages 2022 of the lower sub-flow section is at least twice the number of sub-flow passages 2022 of the upper sub-flow section. The larger the multiple, the more uniform the heat dissipation effect of the substream segment 2021.

Further, as shown in fig. 4, one of the sub-flow channels 2022 in the sub-flow section 2021 is communicated with a plurality of sub-flow channels 2022 in an adjacent sub-flow section 2021 near the heat exchange medium outlet 12, so that the sub-flow channels 2022 are gradually branched toward one end of the heat exchange medium outlet 12 in the second direction Y, the number of the sub-flow channels 2022 toward one end of the heat exchange medium outlet 12 in the second direction Y is gradually increased, and the heat dissipation capability toward one end of the heat exchange medium outlet 12 is improved by increasing the number of the sub-flow channels 2022, so that the overall heat dissipation uniformity of the second flow channel 202 is improved.

Further, as shown in fig. 2 to 4, the width of the sub-flow path 2022 of the sub-flow section 2021 decreases stepwise in the second direction Y, and the pitch between the sub-flow paths 2022 of the sub-flow section 2021 decreases stepwise in the second direction Y. In the case where the width of the heat exchange plate 100 in the first direction X is kept constant, since the number of sub-flow passages 2022 of the sub-flow section 2021 toward one end of the heat exchange medium outlet 12 in the second direction Y is gradually increased, the width of the sub-flow passages 2022 in the first direction X and the spacing between adjacent sub-flow passages 2022 in the first direction X are gradually reduced, and the heat radiation uniformity of the second flow passage 202 in the second direction Y is improved by setting the width of the sub-flow passages 2022 and the spacing between adjacent sub-flow passages 2022.

Further, as shown in fig. 2 to 3, the spacing between two adjacent second flow channels 202 in the first direction X is smaller than the spacing between two adjacent first flow channels 201 in the first direction X. Since the total flow area of the second flow channels 202 is larger than that of the first flow channels 201, and at the same time, the spacing between the second flow channels 202 in the first direction X is smaller than that between the adjacent first flow channels 201, so that the heat dissipation uniformity of the second flow channels 202 in the first direction X is improved.

As an embodiment, as shown in fig. 2 to 3, the intervals of the adjacent first flow channels 201 in the first direction X are set to 5-100mm, the intervals of the adjacent second flow channels 202 in the first direction X are set to 1-50mm, the number of the second flow channels 202 arranged in the first direction X is larger than that of the first flow channels 201, and meanwhile, the intervals of the second flow channels 202 in the first direction X are smaller than that of the first flow channels 201, so that the arrangement density of the second flow channels 202 in the first direction X is larger than that of the first flow channels 201, and the cooling effect of the second flow channels 202 is improved more uniformly. Of course, the intervals of the adjacent sub-flow channels 2022 in the first direction X are set to be 1-50mm, the intervals of the sub-flow channels 2022 in the first direction X gradually decrease towards one end of the heat exchange medium outlet 12 along the second direction Y, so that the intervals between the sub-flow channels 2022 near one end of the heat exchange medium outlet 12 gradually decrease, the density of the sub-flow channels 2022 increases, the cooling effect of the cooling tributary at one end of the heat exchange medium outlet 12 is improved, and the uniformity of the cooling effect of the heat exchange plate 100 from the heat exchange medium inlet 11 to the heat exchange medium outlet 12 is further improved.

Further, as shown in fig. 7, the height H of the heat exchange medium channel 20 in the third direction Z accounts for 50% -75% of the total thickness H of the heat exchange plate 100, so that the heat exchange medium channel 20 is set to a larger height in the third direction Z on the basis of maintaining the overall supporting strength of the heat exchange plate 100, the capacity of the cooling liquid in the heat exchange medium channel 20 is increased, and the heat dissipation effect of the heat exchange medium channel 20 is improved. Wherein the first direction X, the second direction Y, and the third direction Z intersect each other.

Further, as shown in fig. 2 to 3, the heat exchange plate 100 is provided at opposite ends thereof in the second direction Y with a heat exchange medium inflow groove 21 and a heat exchange medium outflow groove 22 extending in the first direction X, respectively, and the first flow passages 201 of the plurality of heat exchange medium passages 20 communicate with the heat exchange medium inlet 11 through the heat exchange medium inflow groove 21 and the second flow passages 202 of the plurality of heat exchange medium passages 20 communicate with the heat exchange medium outlet 12 through the heat exchange medium outflow groove 22. The heat exchange medium inflow groove 21 is located between the heat exchange medium inlet 11 and the first flow channels 201, a buffer space is provided for cooling liquid to enter from the heat exchange medium inlet 11 through the heat exchange medium inflow groove 21, so that the flow speed of the cooling liquid entering the first flow channels 201 is more stable, and meanwhile, the plurality of first flow channels 201 are respectively communicated with the heat exchange medium inflow groove 21, so that the cooling liquid in the heat exchange medium inflow groove 21 is split into the plurality of first flow channels 201, and the splitting of the cooling liquid is more uniform. The heat exchange medium outflow groove 22 is located between the heat exchange medium outlet 12 and the second flow channels 202, the plurality of second flow channels 202 are all communicated with the heat exchange medium outflow groove 22, cooling liquid enters the heat exchange medium outflow groove 22 from the second flow channels 202, and the heat exchange medium outflow groove 22 provides collecting space for the plurality of second flow channels 202, so that the flow rate of the cooling liquid entering the heat exchange medium outlet 12 is more stable. By the arrangement of the heat exchange medium inflow groove 21 and the heat exchange medium outflow groove 22, the cooling liquid in the heat exchange medium channel 20 flows more smoothly and more stably. The shapes of the heat exchange medium inflow groove 21 and the heat exchange medium outflow groove 22 are not limited, and as an embodiment, the heat exchange medium outflow groove 22 and the heat exchange medium inflow groove 21 are rectangular extending along the first direction X, which is more convenient for processing, and meanwhile, the connection of the first flow channel 201 and the second flow channel 202 arranged at intervals along the first direction X can be satisfied, and the requirement of heat dissipation uniformity of the first flow channel 201 and the second flow channel 202 in the first direction X can be satisfied.

As an example, as shown in fig. 2 to 3, the widths of the heat exchange medium inflow groove 21 and the heat exchange medium outflow groove 22 in the second direction Y are greater than or equal to 0.1mm, and the heat exchange medium inflow groove 21 and the heat exchange medium outflow groove 22 are provided at a certain width to provide a moderate buffer space for the cooling liquid. The depths of the heat exchange medium inflow groove 21 and the heat exchange medium outflow groove 22 are respectively consistent with the thickness of the heat exchange medium channel 20 in the third direction Z, so that the flow of the heat exchange medium is smoother.

Further, as shown in fig. 2 and fig. 5 to fig. 7, the heat exchange plate 100 includes a cover plate 1 and a base plate 2, and the cover plate 1 and the base plate 2 are connected in a sealing manner to form the heat exchange plate 100, so as to avoid leakage of a heat exchange medium. It should be noted that the connection manner of the cover plate 1 and the base plate 2 includes, but is not limited to, laser welding, ultrasonic welding, adhesive bonding or hot pressing, and nano injection molding. The heat exchange plate 100 is divided into a cover plate 1 and a base plate 2, and the heat exchange plate 100 is of a split structure, so that the heat exchange medium channel 20 can be processed more conveniently. The heat exchange medium channel 20 in the cover plate 1 is in a groove structure, the opening of the heat exchange medium channel 20 faces the base plate 2, and the notch of the heat exchange medium channel 20 is sealed through the base plate 2 to form a flow channel structure. Or, the base plate 2 is provided with a heat exchange medium channel 20, the heat exchange medium channel 20 in the base plate 2 is of a groove structure, the opening of the heat exchange medium channel 20 faces the cover plate 1, and the notch of the heat exchange medium channel 20 is sealed through the cover plate 1 to form a flow channel structure. The heat exchange medium channel 20 is arranged on the cover plate 1 or the base plate 2, the processing method is simple, the assembly method is simple, and the arrangement of the heat exchange medium channel 20 in the heat exchange plate 100 can be realized.

The opposite surfaces of the base plate 2 and the cover plate 1 are respectively provided with a heat exchange medium channel 20. The heat exchange medium channels 20 are arranged on the base plate 2, the heat exchange medium channels 20 are also arranged on the cover plate 1, and the heat exchange medium channels 20 on the base plate 2 and the heat exchange medium channels 20 on the cover plate 1 can be respectively two independent heat exchange medium channels 20. Because the cover plate 1 and the base plate 2 are both provided with the heat exchange medium channels 20, the number of the heat exchange medium channels 20 is increased, the capacity of the heat exchange medium in the heat exchange plate 100 is larger, and the cooling effect is better. The heat exchange medium channels 20 on the base plate 2 and the cover plate 1 are of groove structures, the grooves are oppositely arranged, the positions and the structures of the heat exchange medium channels 20 on the cover plate 1 and the base plate 2 are correspondingly arranged, so that the heat exchange medium channels 20 on the base plate 2 and the cover plate 1 are communicated through the grooves, the depth of the heat exchange medium channels 20 in the third direction Z is improved, namely the capacity of heat exchange medium in the heat exchange plate 100 is larger, and the heat exchange effect is better.

As an example, as shown in fig. 5, the cover plate 1 is manufactured by punching, extruding or casting, the thickness of the cover plate 1 is set to 0.1-5mm, and the cover plate 1 is made of a metal material such as copper alloy, aluminum alloy or magnesium alloy. Because the metal material heat conductivity is better, the base plate 2 is provided with the heat exchange medium channel 20 of the groove structure, the notch of the heat exchange medium channel 20 faces the cover plate 1, the notch of the heat exchange medium channel 20 is sealed through the cover plate 1, at least the cover plate 1 is in abutting contact with the battery 200, heat exchange between the heat exchange medium in the heat exchange plate 100 and the battery is accelerated, and the heat conduction efficiency between the battery 200 and the heat exchange medium of the heat exchange plate 100 is improved.

As an embodiment, as shown in fig. 1, the cover plate 1 or the base plate 2 is fixed at a position with high heat of the battery 200 by an adhesive, and the adhesive is a heat-conducting structural adhesive or a heat-conducting structural adhesive tape.

As an example, as shown in fig. 2 to 3, the substrate 2 is formed by injection molding, the thickness is set to 0.1mm-20mm, the material of the substrate 2 is plastic, such as nylon, polyphenylene sulfide, polybutylene terephthalate, polypropylene, etc., and when the substrate 2 is plastic, the low-temperature heat preservation of the power battery 200 is performed by utilizing the low thermal conductivity of the plastic material.

Further, as shown in fig. 2 and 6, the heat exchange plate 100 further comprises a first joint 3 and a second joint 4, the heat exchange plate 100 is provided with a heat exchange medium inlet 11 and a heat exchange medium outlet 12, the first joint 3 is communicated with the first flow channel 201 through the heat exchange medium inlet 11, and the second joint 4 is communicated with the second flow channel 202 through the heat exchange medium outlet 12. The heat exchange medium enters the first flow channel 201 from the first connector 3, is discharged from the second flow channel 202 through the second connector 4, and is more convenient to access and discharge the heat exchange medium through the arrangement of the first connector 3 and the second connector 4. As an embodiment, the first connector 3 and the second connector 4 are both disposed on the cover plate 1 or the base plate 2, or the first connector 3 is disposed on the cover plate 1, the second connector 4 is disposed on the base plate 2, or the first connector 3 is disposed on the base plate 2, and the second connector 4 is disposed on the cover plate 1, so long as the first connector 3 can communicate with the heat exchange medium inlet 11, and the second connector 4 can communicate with the heat exchange medium outlet 12. Of course, as an example, the first connector 3 communicates with the heat exchange medium inflow groove 21 through the heat exchange medium inlet 11, and the second connector 4 communicates with the heat exchange medium outflow groove 22 through the heat exchange medium outlet 12.

Further, the battery pack further includes: the box body is provided with a containing cavity, and the battery 200 and the heat exchange plate 100 are arranged in the containing cavity; the battery 200 and the heat exchange plate 100 are fixed and limited through the accommodating cavity, so that at least one side of the heat exchange plate 100 is abutted against the battery 200, and the heat exchange effect of the heat exchange plate 100 on the battery 200 is ensured. Or a frame, which defines a receiving chamber together with the heat exchange plate 100, and the battery 200 is disposed in the receiving chamber. The battery 200 is fixed and limited through the accommodating cavity, the battery 200 is prevented from being far away from the heat exchange plate 100, and the heat exchange effect of the heat exchange plate 100 on the battery 200 is ensured. The battery 200 is fixed by a frame, and a lightweight arrangement is realized.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims (11)

1. A battery pack is characterized by comprising a battery (200) and a heat exchange plate (100), wherein the heat exchange plate (100) is attached to the battery (200),

the heat exchange plate (100) is provided with at least one heat exchange medium channel (20), a plurality of heat exchange medium channels (20) are arranged at intervals along a first direction, opposite ends of the heat exchange plate (100) along a second direction (Y) are respectively provided with a heat exchange medium inlet (11) and a heat exchange medium outlet (12), wherein the first direction (X) is intersected with the second direction (Y), the heat exchange medium channels (20) comprise a first runner (201) and a second runner (202), and the heat exchange medium inlet (11), the first runner (201), the second runner (202) and the heat exchange medium outlet (12) are sequentially communicated along the second direction (Y);

the total flow area of the plurality of second flow channels (202) is greater than the total flow area of the first flow channels (201).

2. The battery pack according to claim 1, wherein each of the heat exchange medium passages (20) includes one of the first flow passages (201) and a plurality of the second flow passages (202), adjacent two of the second flow passages (202) being disposed at intervals along the first direction (X), each of the first flow passages (201) being in communication with the plurality of the second flow passages (202).

3. The battery pack according to claim 2, wherein each of the second flow channels (202) comprises a plurality of sub-flow sections (2021) along the second direction (Y), each of the sub-flow sections (2021) comprises a plurality of sub-flow channels (2022), the sub-flow channels (2022) of two adjacent sub-flow sections (2021) in the second direction (Y) are in communication, the number of sub-flow channels (2022) of the sub-flow sections (2021) increases in sections along the second direction (Y) towards one end of the heat exchange medium outlet (12), and the total flow area of the sub-flow sections (2021) increases in sections along the second direction (Y) towards one end of the heat exchange medium outlet (12).

4. A battery pack according to claim 3, wherein one of the sub-flow channels (2022) of the sub-flow sections (2021) communicates with a plurality of the sub-flow channels (2022) in an adjacent sub-flow section (2021) near the heat exchange medium outlet (12).

5. A battery pack according to claim 3, wherein the widths of the sub-flow channels (2022) of the plurality of sub-flow segments (2021) decrease segment by segment along the second direction (Y), and the pitches of the sub-flow channels (2022) of the plurality of sub-flow segments (2021) between the first direction (X) decrease segment by segment along the second direction (Y).

6. The battery pack according to claim 1, wherein a spacing between adjacent two of the second flow channels (202) in a first direction (X) is smaller than a spacing between adjacent two of the first flow channels (201) in the first direction (X).

7. The battery pack according to claim 1, wherein the heat exchange plate (100) is provided with a heat exchange medium inflow groove (21) and a heat exchange medium outflow groove (22) extending in the first direction (X) at opposite ends thereof in the second direction (Y), respectively, and a plurality of the first flow passages (201) communicate with the heat exchange medium inlet (11) through the heat exchange medium inflow groove (21), and a plurality of the second flow passages (202) communicate with the heat exchange medium outlet (12) through the heat exchange medium outflow groove (22).

8. The battery pack according to claim 1, wherein the heat exchange plate (100) comprises a cover plate (1) and a base plate (2), the cover plate (1) and the base plate (2) are connected in a sealing manner to form the heat exchange plate (100), the cover plate (1) is provided with the heat exchange medium channel (20), or

The base plate (2) is provided with the heat exchange medium channel (20), or

The opposite surfaces of the base plate (2) and the cover plate (1) are respectively provided with the heat exchange medium channels (20).

9. The battery pack according to claim 1, wherein: the height H of the heat exchange medium channels (20) in the third direction (Z) is 50-75% of the total thickness H of the heat exchange plate (100).

10. The battery pack according to claim 1, wherein: the heat exchange plate (100) further comprises a first joint (3) and a second joint (4), wherein the first joint (3) is communicated with the first flow channel (201) through the heat exchange medium inlet (11), and the second joint (4) is communicated with the second flow channel (202) through the heat exchange medium outlet (12).

11. The battery pack according to claim 1, further comprising a case having a receiving chamber, wherein the battery (200) and the heat exchange plate (100) are both disposed in the receiving chamber; or (b)

The frame body and the heat exchange plate (100) jointly define a containing cavity, and the battery (200) is arranged in the containing cavity.