CN220491966U - Battery pack - Google Patents

Abstract

The utility model relates to the field of battery technology and discloses a battery pack, which includes a battery and a heat exchange plate. The heat exchange plate is attached to the battery. The heat exchange plate includes a plurality of heat exchange medium channels spaced apart along a first direction. The opposite ends of the hot plate along the second direction are respectively provided with a heat exchange medium inlet and a heat exchange medium outlet, wherein the first direction intersects with the second direction, and the heat exchange medium channel includes a first flow channel and a liquid outlet flow channel. The medium inlet, the first flow channel, the liquid outlet flow channel and the heat exchange medium outlet are sequentially connected along the first direction; the total flow area of the plurality of liquid outlet flow channels is greater than the total flow area of the plurality of first flow channels. The battery pack of the present invention solves the problem of uneven heat exchange effect by arranging multiple liquid outlet flow channels with a total flow area larger than the total flow area of the first flow channel.

Description

a battery pack

Technical field

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

Background technique

Thermal management is a process that uses heating or cooling means to adjust and control the temperature or temperature difference of a specific object according to the requirements of the object. The battery pack releases a certain amount of energy when charging or discharging, so the battery pack needs to be cooled. When the battery pack is in a low-temperature environment, the electrolyte of the battery pack becomes viscous, which causes the internal resistance of the lithium battery in the battery pack to increase. In addition, the negative electrode material is seriously polarized, causing lithium ion deposition and coating phenomena, which will reduce the available capacity of the lithium battery. , The discharge rate decreases. As the temperature of the lithium-ion battery decreases, the energy it can release decreases, the capacity decreases, the voltage becomes lower, and ultimately the battery life 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. Among them, a heat exchange plate is usually provided in the battery pack, the battery is attached to the heat exchange plate, a heat exchange medium channel is provided in the heat exchange plate, and the heat exchange medium is filled into the heat exchange medium channel to cool the battery. Or heating to achieve the purpose of battery thermal management. Heat exchange plates are the key to thermal management components.

The existing heat exchange plate has a uniform heat exchange medium channel design from the heat exchange medium inlet to the heat exchange medium outlet. The longer the flow distance of the heat exchange medium in the heat exchange medium channel, the greater the temperature change of the heat exchange medium. Therefore, along the flow direction of the heat exchange medium, the thermal management effect of the heat exchange medium at the end of the flow direction on the battery becomes significantly worse, which in turn leads to uneven thermal management effect of the battery, which is not conducive to the stable performance and use of the battery. life.

Utility model content

The purpose of this utility model is to provide a battery pack to solve the problems of unreasonable flow channel structure of the heat exchange plate and uneven thermal management effect in the existing battery pack.

In order to achieve the above purpose, the present utility model provides a battery pack, which includes a battery and a heat exchange plate, and the heat exchange plate is attached to the battery.

The heat exchange plate includes at least one heat exchange medium channel. A plurality of the heat exchange medium channels are spaced apart along the first direction. The opposite ends of the heat exchange plate along the second direction are respectively provided with a heat exchange medium inlet and an exchange medium channel. Heat medium outlet, wherein the first direction intersects the second direction, the heat exchange medium channel includes a first flow channel and a second flow channel, the heat exchange medium inlet, the first flow channel, the The second flow channel and the heat exchange medium outlet are sequentially connected 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 of the heat exchange medium channels includes one first flow channel and a plurality of second flow channels, and two adjacent second flow channels are spaced apart along the first direction. The first flow channel communicates with a plurality of second flow channels.

Preferably, each second flow channel includes a plurality of sub-flow sections along the second direction, each of the sub-flow sections includes a plurality of sub-flow channels, and two adjacent sub-flow sections in the second direction The sub-flow channels of the sub-flow segments are connected, the number of the sub-flow channels of the sub-flow segments increases segment by segment along the second direction toward one end of the heat exchange medium outlet, and the total flow area of the sub-flow segments is along the The second direction increases gradually toward one end of the heat exchange medium outlet.

Preferably, one of the sub-flow channels in the sub-flow section is connected to a plurality of the sub-flow channels in the adjacent sub-flow sections close to the heat exchange medium outlet.

Preferably, the width of the plurality of sub-flow channels decreases step by step along the second direction, and the spacing between the plurality of sub-flow channels in the first direction decreases step by step 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, opposite ends of the heat exchange plate along the second direction are respectively provided with heat exchange medium inflow grooves and heat exchange medium outflow grooves extending along the first direction, and a plurality of the first flow channels pass through the exchanger. The heat medium inflow groove is connected to the heat exchange medium inlet, and the plurality of second flow channels are connected to the heat exchange medium outlet through the heat exchange medium outflow groove.

Preferably, the heat exchange plate includes a cover plate and a base plate, the cover plate and the base plate are sealingly connected to form the heat exchange plate, and the cover plate is provided with the heat exchange medium channel, or

The substrate is provided with the heat exchange medium channel, or

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

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 includes a first joint and a second joint, the first joint is connected to the first flow channel through the heat exchange medium inlet, and the second joint is connected through the heat exchange medium outlet. connected to the second flow channel.

Preferably, it also includes a box body, the box body has a receiving cavity, and the battery and the heat exchange plate are both located in the receiving cavity; or

A frame body, the frame body and the heat exchange plate jointly define an accommodation cavity, and the battery is disposed in the accommodation cavity.

The utility model provides a battery pack. Compared with the prior art, the beneficial effect is that the battery pack includes a battery and a heat exchange plate. The heat exchange plate is attached to the battery. Since the heat exchange plate has a heat exchange medium, the heat exchange plate can The hot plate is attached to the battery, and heat exchange occurs between the battery and the heat exchange medium in the heat exchange plate to achieve thermal management of the battery pack. The heat exchange plate includes at least one heat exchange medium channel. 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 the entry of the heat exchange medium. The heat exchange medium The outlet is used for the outflow of the heat exchange medium. The heat exchange medium enters the heat exchange medium channel at the heat exchange medium inlet. After heat exchange with the battery in the heat exchange medium channel, the heat exchange medium is discharged from the heat exchange plate through the heat exchange medium outlet. The heat medium realizes flow circulation of the heat exchange medium through the heat exchange medium inlet, the heat exchange medium channel and the heat exchange medium outlet. The heat exchange medium inlet and the heat exchange medium outlet are arranged at opposite ends in the second direction to ensure that the heat exchange medium The thermal management coverage area of the channel in the second direction enables the battery to have a heat exchange medium channel arrangement in the second direction to ensure the thermal management effect of the battery in the second direction. The heat exchange medium channel includes a first flow channel and a third flow channel. The two flow channels, the heat exchange medium inlet, the first flow channel, the second flow channel and the heat exchange medium outlet are connected in sequence along the second direction. The heat exchange medium enters the first flow channel from the heat exchange medium inlet and enters the second flow channel from the first flow channel. After the passage, the heat exchange plate flows out from the heat exchange medium outlet to form a complete heat exchange medium channel path, and the heat exchange medium realizes the circulation of the heat exchange medium through the heat exchange medium channel path. 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 channel from the heat exchange medium inlet, there is less heat exchange between the heat exchange medium and the battery. Therefore, the heat management effect of the heat exchange medium in the first flow channel is better. When the heat exchange medium passes through the first flow channel and performs partial heat exchange with the battery in the first flow channel, the heat exchange capacity of the heat exchange medium entering the second flow channel decreases. By increasing the total flow area of the second flow channel, Make the total flow area of the second flow channel larger than the total flow area of the first flow channel, increase the heat absorption area of the second flow channel, and improve the heat absorption capacity of the heat exchange medium in the second flow channel, thereby solving the problem of the heat exchange medium channel. The technical problem of the large difference in thermal management effect between the inlet end of the heat exchange medium and the outlet end of the heat exchange medium makes the overall thermal management effect of the heat exchange plate in the second direction uniform, and the overall thermal management effect of the battery is more uniform.

Description of the drawings

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

Figure 2 is an exploded structural view of the heat exchange plate according to the embodiment of the present utility model.

Figure 3 is a schematic structural diagram of a substrate according to an embodiment of the present invention.

Figure 4 is a schematic structural diagram of the heat exchange medium channel according to the embodiment of the present invention.

Figure 5 is a cross-sectional view of the utility model at A-A in Figure 3;

Figure 6 is a cross-sectional view of the utility model at B-B in Figure 3;

Figure 7 is an enlarged structural schematic diagram of position C in Figure 5 of the present invention;

Figure 8 is an enlarged structural schematic diagram of D in Figure 6 of the present invention;

Figure 9 is a structural comparison diagram of Figures 5 and 6 of the present utility model;

Figure 10 is a schematic structural diagram of the cover plate according to the embodiment of the present invention.

Figure 11 is a cross-sectional view of the internal structure of the substrate according to the embodiment of the present invention.

Figure 12 is an enlarged structural schematic diagram of position A in Figure 6 according to the embodiment of the present invention.

In the picture:

100. Heat exchange plate; 200. Battery;

1. Cover plate; 11. Heat exchange medium inlet; 12. Heat exchange medium outlet;

2. Base plate; 20. Heat exchange medium channel; 201. First flow channel; 202. Second flow channel; 2021. Sub-flow section; 2022. Sub-flow channel; 21. Heat exchange medium inflow tank; 22. Heat exchange medium outflow groove

3. The first connector; 4. The second connector;

X, first direction; Y, second direction; Z, second direction.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments.

Please refer to Figures 1 to 12 together. An embodiment of the present invention provides a battery pack, which includes a battery 200 and a heat exchange plate 100. The heat exchange plate 100 is attached to the battery 200. It should be noted that the heat exchange plate 100 can It can be attached to one side of the battery 200, or can also be attached to multiple sides of the battery 200. Since the heat exchange medium can be passed into the heat exchange plate 100, the heat exchange plate 100 is attached to the battery 200, and the heat exchange medium is in After flowing through the heat exchange plate 100, the battery 200 performs heat exchange with the heat exchange plate 100 to achieve thermal management of the battery 200.

As shown in FIGS. 2 to 3 , the heat exchange plate 100 includes at least one heat exchange medium channel 20 . When there are multiple heat exchange medium channels 20 , two adjacent heat exchange medium channels 20 are spaced apart along the first direction X. set up. A 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 thermal management effect. 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 the entry of heat exchange medium, and the heat exchange medium outlet 12 is used for heat exchange. When the medium flows out, the heat exchange medium enters the heat exchange medium channel 20 at the heat exchange medium inlet 11. After heat exchange between the heat exchange medium channel 20 and the battery 200, it is discharged from the heat exchange plate 100 through the heat exchange medium outlet 12. The heat exchange medium passes through The heat exchange medium inlet 11, the heat exchange medium channel 20 and the heat exchange medium outlet 12 realize the circulation flow of the heat exchange medium. The heat exchange medium inlet 11 and the heat exchange medium outlet 12 are arranged at opposite ends in the second direction Y to ensure that The coverage area of the heat exchange medium of the heat exchange medium channel 20 in the second direction Y enables the battery 200 to have the heat exchange medium channel 20 arranged in the second direction Y, ensuring thermal management of the battery 200 in the second direction Y. As a result, the heat exchange medium channel 20 includes 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 connected in sequence along the second direction Y. The heat medium enters the first flow channel 201 from the heat exchange medium inlet 11 and enters the second flow channel 202 from the first flow channel 201, and then flows out of the heat exchange plate 100 from the heat exchange medium outlet 12 to form a complete heat exchange medium channel path. The heat exchange medium realizes the circulation of the heat exchange medium through the heat exchange medium channel path. Wherein, the first direction X and the second direction Y intersect, there are a plurality of heat exchange medium channels 20 arranged at intervals in the first direction All of the above ensure the thermal management effect of the battery 200 and improve the thermal management capability of the battery 200.

As shown in FIGS. 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 there are multiple first flow channels 201 , the total flow area of the plurality of second flow channels 202 is greater than the total flow area of the plurality of first flow channels 201 . 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 the first direction X, and the flow areas of the plurality of first flow channels 201 are marked in the figure, where , the total flow area of the first flow channel 201 is the sum of the flow areas of multiple first flow channels. Among them, FIG. 7 is an enlarged view of position C in FIG. 5 , and the blank space marked 201 in FIG. 7 is the flow area of a first flow channel 201 . Figure 6 is a cross-sectional view at B-B in Figure 3 to show that a plurality of second flow channels 202 are spaced in the first direction X. Figure 8 is an enlarged structural view of D in Figure 6. In Figure 8 The blank space marked 202 is the flow area of one second flow channel 202, and the total flow area of the second flow channel is the sum of the flow areas of multiple second flow channels in Figure 6. As shown in Figure 9, taking a heat exchange medium channel 20 as an example, a heat exchange medium channel includes a first flow channel 201 and two second flow channels 202. The third flow channel between the first flow channel 201 and the second flow channel 202 is When the direction Z is the same, the width of the two second flow channels 202 in the first direction X is greater than the width of the first flow channel 201 in the first direction. Therefore, the total flow area of the two second flow channels is larger than the The total flow area of the first channel. Among them, the calculation method of "total circulation area" referred to in this article is the same.

Among them, when the battery 200 needs to be cooled, the heat exchange medium is a low-temperature fluid, and the low-temperature fluid enters from the heat exchange medium inlet 11. The first flow channel 201 is connected with the heat exchange medium inlet 11. At this time, the temperature of the low-temperature fluid is relatively low, so , the cooling effect in the first flow channel 201 is better. When the low-temperature fluid passes through the first flow channel 201 , it absorbs part of the heat of the battery 200 , and then the temperature of the low-temperature fluid after passing through the first flow channel 201 rises relative to the temperature at the heat exchange medium inlet 11 , causing the inlet to The heat absorption capacity of the low-temperature fluid in the second flow channel 202 is reduced relative to the low-temperature fluid in the first flow channel 201. 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 that of the first flow channel 201. The total circulation area increases the heat absorption contact area of the second flow channel 202 and improves the heat absorption capacity of the low-temperature fluid in the second flow channel 202, thereby solving the problem of the heat exchange medium channel 20 having a contact with the heat exchange medium at the heat exchange medium inlet 11 end. The technical problem of large difference in cooling effect at the outlet 12 end makes the overall cooling effect of the heat exchange plate 100 in the second direction Y uniform, and the overall heat dissipation of the battery 200 is more uniform. As one embodiment, the low-temperature fluid is a cooling liquid, such as a mixture of ice and water. Of course, the heat exchange medium can be used as long as it can cool down 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. The first flow channel 201 is connected to the heat exchange medium inlet 11. At this time, the temperature of the high-temperature fluid is relatively high. Therefore, the first flow The high-temperature fluid in Channel 201 has a better heating effect. When the high-temperature fluid passes through the first flow channel 201, part of the heat is transferred to the battery 200 in the first flow channel 201, and the temperature of the high-temperature fluid after passing through the first flow channel 201 is relatively lower than the temperature at the heat exchange medium inlet 11, resulting in The heating capacity of the high-temperature fluid entering the second flow channel 202 is lower than that of the high-temperature fluid in the first flow channel 201. 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 that of the first flow channel 201. The total circulation area increases the heating area of the second flow channel 202 and improves the heating capacity of the high-temperature fluid in the second flow channel 202, thus solving the problem between the heat exchange medium inlet 11 end of the heat exchange medium channel 20 and the heat exchange medium outlet 12 The technical problem of large difference in heating effect between the two ends is eliminated, so that 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 one embodiment, the high-temperature fluid is water with a relatively high temperature. Of course, the heat exchange medium only needs to be able to heat the battery.

Further, as shown in Figures 2 to 3, in the heat exchange medium channel 20, after the heat exchange medium performs heat exchange in the first flow channel 201, therefore, after the heat exchange medium enters the second flow channel 202, the heat exchange capacity is The heat exchange medium channel 20 includes a first flow channel 201 and a plurality of second flow channels 202. Increase the number of the second flow channels 202 so that the number of the second flow channels 202 is greater than the number of the first flow channels 201, and Adjacent second flow channels 202 are spaced apart 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 channel 201 is connected to a plurality of second flow channels 202, so that the heat exchange medium in the first flow channel 201 is divided into the second flow channels 202, and the heat exchange medium in the first flow channel 201 is divided into a plurality of second flow channels. 202, the heat exchange medium is evenly distributed in the plurality of second flow channels 202 to ensure uniform distribution of the heat exchange medium in the heat exchange plate 100. As one embodiment, 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 connected to two adjacent first flow channels 201 respectively. .

Further, as shown in Figure 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 channels 2022. Two adjacent sub-flow sections in the second direction Y 2021 are connected, the number of sub-flow channels 2022 of the sub-flow section 2021 increases step by step along the second direction Y, and the total flow area of the sub-flow section 2021 increases step by step along the second direction Y. The second flow channel 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 channels 2022. Since the number of the sub-flow channels 2022 increases section by section along the second direction Y, the closer the sub-flow sections are to each other. The greater the number of sub-flow channels 2022 in the sub-flow section 2021 at one end of the heat exchange medium outlet 12, the closer the total flow area of the sub-flow channels 2022 in the sub-flow section 2021 at one end of the heat exchange medium outlet 12 is to increase the total flow area of the sub-flow channels 2022 close to the heat exchange medium outlet 12. The heat dissipation capacity of the heat exchange medium channel 20 at one end of the outlet 12 improves the overall heat dissipation uniformity of the heat exchange medium channel 20 .

As one embodiment, among the two adjacent sub-flow sections 2021 in the second direction Y, the sub-flow section 2021 close to the heat exchange medium outlet 12 is the lower sub-flow section, and the sub-flow section 2021 close to the heat exchange medium inlet 11 is the upper sub-flow section. In the sub-flow section, the number of sub-flow channels 2022 in the lower sub-flow section is at least twice the number of sub-flow channels 2022 in the upper sub-flow section. Among them, the larger the multiple, the more uniform the heat dissipation effect of the sub-flow section 2021.

Further, as shown in Figure 4, one of the sub-flow channels 2022 in the sub-flow section 2021 is connected with multiple sub-flow channels 2022 in the adjacent sub-flow section 2021 close to the heat exchange medium outlet 12, so that the sub-flow channels 2022 gradually divides the flow toward the heat exchange medium outlet 12 in the second direction Y. The number of sub-flow channels 2022 toward the heat exchange medium outlet 12 in the second direction Y gradually increases. By increasing the number of sub-flow channels 2022, the direction is improved. The heat dissipation capability of one end of the heat exchange medium outlet 12 improves the overall heat dissipation uniformity of the second flow channel 202 .

Further, as shown in Figures 2 to 4, the width of the sub-flow channel 2022 of the sub-flow section 2021 is gradually reduced along the second direction Y, and the width of the sub-flow channel 2022 of the sub-flow section 2021 is between the first direction The spacing decreases step by step along the second direction Y. When the width of the heat exchange plate 100 remains constant in the first direction The width in the first direction X and the spacing between adjacent sub-flow channels 2022 in the first direction The heat dissipation uniformity of the second flow channel 202 in the second direction Y is improved.

Further, as shown in FIGS. 2 to 3 , the distance between two adjacent second flow channels 202 in the first direction X is smaller than the distance between adjacent first flow channels 201 in the first direction X. Since the total flow area of the second flow channel 202 is larger than the total flow area of the first flow channel 201, and at the same time, the distance between the second flow channels 202 in the first direction X is smaller than the distance between the adjacent first flow channels 201, the improvement The heat dissipation uniformity of the second flow channel 202 in the first direction X.

As one embodiment, as shown in FIGS. 2 to 3 , the spacing between adjacent first flow channels 201 in the first direction X is set at 5-100 mm, and the spacing between adjacent second flow channels 202 in the first direction The spacing is set at 1-50 mm. The number of second flow channels 202 arranged in the first direction X is greater than the number of first flow channels 201. At the same time, the spacing of the second flow channels 202 in the first direction The spacing of 201 makes the arrangement density of the second flow channels 202 in the first direction X greater than that of the first flow channels 201, thereby improving the cooling effect of the second flow channels 202 to be more uniform. Of course, the spacing between adjacent sub-flow channels 2022 in the first direction X is set at 1-50 mm, and the spacing between the sub-flow channels 2022 in the first direction The distance between the sub-flow channels 2022 near the end of the heat exchange medium outlet 12 gradually decreases, and the density of the sub-flow channels 2022 increases, which improves the cooling effect of the cooling branch flow at one end of the heat exchange medium outlet 12, thereby improving the efficiency of the heat exchange plate 100. The uniformity of the cooling effect between the heat medium inlet 11 and the heat exchange medium outlet 12.

Further, as shown in Figure 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, on the basis of maintaining the overall support strength of the heat exchange plate 100. , the heat exchange medium channel 20 is set to a larger height in the third direction Z, thereby increasing the capacity of the cooling liquid in the heat exchange medium channel 20 and improving the heat dissipation effect of the heat exchange medium channel 20 . Among them, the first direction X, the second direction Y and the third direction Z intersect with each other.

Further, as shown in Figures 2 to 3, the opposite ends of the heat exchange plate 100 along the second direction Y are respectively provided with a heat exchange medium inflow groove 21 and a heat exchange medium outflow groove 22 extending along the first direction X. The first flow channel 201 of each heat exchange medium channel 20 is connected to the heat exchange medium inlet 11 through the heat exchange medium inlet groove 21, and the second flow channels 202 of the plurality of heat exchange medium channels 20 are connected to the heat exchange medium through the heat exchange medium outflow groove 22. Exit 12 is connected. The heat exchange medium inflow groove 21 is located between the heat exchange medium inlet 11 and the first flow channel 201. The heat exchange medium inflow groove 21 provides a buffer space for the cooling liquid after entering from the heat exchange medium inlet 11, so that the cooling liquid enters the first flow channel. 201, the flow rate is more stable. At the same time, the plurality of first flow channels 201 are respectively connected with the heat exchange medium inflow groove 21, so that the cooling liquid in the heat exchange medium inflow groove 21 is diverted to the plurality of first flow passages 201, so that the cooling liquid is more divided. for uniformity. The heat exchange medium outflow groove 22 is located between the heat exchange medium outlet 12 and the second flow channel 202. The plurality of second flow channels 202 are all connected with the heat exchange medium outflow groove 22. The cooling liquid enters the heat exchange medium from the second flow channel 202. The outflow groove 22 and the heat exchange medium outflow groove 22 provide a collection space for the plurality of second flow channels 202, so that the flow rate of the cooling liquid into the heat exchange medium outlet 12 is more stable. Through the arrangement of the heat exchange medium inflow groove 21 and the heat exchange medium outflow groove 22, the cooling liquid flow in the heat exchange medium channel 20 is made smoother and more stable. The shapes of the heat exchange medium inflow groove 21 and the heat exchange medium outflow groove 22 are not limited. As one embodiment, the heat exchange medium outflow groove 22 and the heat exchange medium inflow groove 21 are both rectangular shapes extending along the first direction X. , is more convenient for processing, and at the same time can meet the connection of the first flow channel 201 and the second flow channel 202 arranged at intervals along the first direction .

As one of the embodiments, as shown in FIGS. 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 0.1 mm. The heat medium outflow groove 22 is set 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, making the flow of the heat exchange medium smoother.

Further, as shown in Figure 2 and Figures 5 to 7, the heat exchange plate 100 includes a cover plate 1 and a base plate 2. The cover plate 1 and the base plate 2 are sealingly connected to form the heat exchange plate 100 to avoid leakage of the heat exchange medium. It should be noted that the connection method between 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. The heat exchange plate 100 has a split structure, which is more convenient for processing the heat exchange medium channel 20. Among them, the heat exchange medium channel 20 in the cover plate 1 has a groove structure. The opening of the heat exchange medium channel 20 faces the base plate 2. The slot of the heat exchange medium channel 20 is sealed by 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 has a groove structure. The opening of the heat exchange medium channel 20 faces the cover plate 1, and the heat exchange medium channel 20 is passed through the cover plate 1. The slot seal of the medium channel 20 forms a flow channel structure. The heat exchange medium channel 20 is provided on the cover plate 1 or the base plate 2. The processing method is simple and the assembly method is simple, and the heat exchange medium channel 20 can be installed in the heat exchange plate 100.

Heat exchange medium channels 20 are respectively provided on the opposite surfaces of the base plate 2 and the cover plate 1 . The base plate 2 is provided with a heat exchange medium channel 20, and the cover plate 1 is also provided with a heat exchange medium channel 20. The heat exchange medium channel 20 on the base plate 2 and the heat exchange medium channel 20 on the cover plate 1 can be two independent exchangers. Thermal medium channel 20. Since both the cover plate 1 and the base plate 2 are provided with heat exchange medium channels 20, the number of 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 both groove structures and the slots are arranged oppositely. The positions and structures of the heat exchange medium channels 20 on the cover plate 1 and the base plate 2 are set correspondingly, so that the base plate 2 and the cover plate The heat exchange medium channel 20 on 1 is connected through the slot, which helps to increase the depth of the heat exchange medium channel 20 in the third direction Z, that is, the heat exchange medium capacity in the heat exchange plate 100 is larger and the heat exchange effect is better. .

As one embodiment, as shown in Figure 5, the cover plate 1 is made by stamping, extrusion or casting. The thickness of the cover plate 1 is set at 0.1-5mm. The cover plate 1 is made of metal materials, such as copper alloy and aluminum alloy. Or magnesium alloy, etc. Since metal materials have good thermal conductivity, the base plate 2 is provided with a heat exchange medium channel 20 with a groove structure. The notch of the heat exchange medium channel 20 faces the cover plate 1, and the notch of the heat exchange medium channel 20 is sealed by the cover plate 1. At least the cover plate 1 is in close contact with the battery 200, which accelerates the heat exchange between the heat exchange medium in the heat exchange plate 100 and the battery, and improves the heat conduction efficiency between the battery 200 and the heat exchange medium of the heat exchange plate 100.

As one of the embodiments, as shown in FIG. 1 , the cover 1 or the substrate 2 is fixed on the high-heat position of the battery 200 through adhesive. The adhesive is a thermally conductive structural glue or a thermally conductive structural tape.

As one embodiment, as shown in Figures 2 to 3, the substrate 2 is formed by injection molding, with a thickness set at 0.1mm-20mm. The material of the substrate 2 is plastic, such as nylon, polyphenylene sulfide, polybutylene terephthalate. Diester, polypropylene, etc., when the substrate 2 is made of plastic, the low thermal conductivity of the plastic material is used to insulate the power battery 200 at low temperature.

Further, as shown in Figures 2 and 6, the heat exchange plate 100 also includes 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 The heat exchange medium inlet 11 communicates with the first flow channel 201 , and the second joint 4 communicates 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 joint 3 and is discharged from the second flow channel 202 through the second joint 4. The arrangement of the first joint 3 and the second joint 4 makes it easier to access and discharge the heat exchange medium. . As one embodiment, both the first connector 3 and the second connector 4 are provided on the cover plate 1 or the base plate 2, or the first connector 3 is provided on the cover plate 1, and the second connector 4 is provided on the base plate 2, or the first connector 3 It is provided on the base plate 2 and the second joint 4 is provided on the cover plate 1 , as long as the first joint 3 can communicate with the heat exchange medium inlet 11 and the second joint 4 can communicate with the heat exchange medium outlet 12 . Of course, as one embodiment, the first joint 3 is connected to the heat exchange medium inflow groove 21 through the heat exchange medium inlet 11 , and the second joint 4 is connected to the heat exchange medium outflow groove 22 through the heat exchange medium outlet 12 .

Further, the battery pack also includes: a box body with a receiving cavity, in which the battery 200 and the heat exchange plate 100 are disposed; the battery 200 and the heat exchange plate 100 are fixed and limited through the receiving cavity, so that the battery 200 and the heat exchange plate 100 are fixed and limited. At least one side of the heat exchange plate 100 is in contact with the battery 200 to ensure the heat exchange effect of the heat exchange plate 100 on the battery 200 . Or a frame, the frame and the heat exchange plate 100 jointly define a receiving cavity, and the battery 200 is disposed in the receiving cavity. The battery 200 is fixed and limited through the accommodation cavity, preventing the battery 200 from moving away from the heat exchange plate 100 and ensuring the heat exchange effect of the heat exchange plate 100 on the battery 200. Among them, the battery 200 is fixed through the frame to achieve lightweight installation.

The above are only preferred embodiments of the present invention. It should be pointed out that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention. These improvements and replacement should also be regarded as the protection scope of the present utility model.

Claims (11)

1. A battery pack, characterized in that it includes a battery (200) and a heat exchange plate (100), and 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 the heat exchange medium channels (20) are spaced along the first direction. The heat exchange plate (100) is arranged along the second direction. The opposite ends of (Y) are respectively provided with a heat exchange medium inlet (11) and a heat exchange medium outlet (12), wherein the first direction (X) intersects the second direction (Y), and the exchange medium inlet (11) and the heat exchange medium outlet (12) are respectively provided. The heat medium channel (20) includes a first flow channel (201) and a second flow channel (202). The heat exchange medium inlet (11), the first flow channel (201), and the second flow channel (202) And the heat exchange medium outlets (12) are connected in sequence 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 heat exchange medium channel (20) includes one first flow channel (201) and a plurality of second flow channels (202), Two adjacent second flow channels (202) are spaced apart along the first direction (X), and each first flow channel (201) is connected to a plurality of second flow channels (202). 3. The battery pack according to claim 2, characterized in that each second flow channel (202) includes a plurality of sub-flow sections (2021) along the second direction (Y), each of the sub-flow sections (2021). The flow section (2021) includes a plurality of sub-flow channels (2022), and the sub-flow channels (2022) of two adjacent sub-flow sections (2021) in the second direction (Y) are connected. (2021) The number of the sub-flow channels (2022) increases section by section along the second direction (Y) toward one end of the heat exchange medium outlet (12), and the total circulation of the sub-flow sections (2021) The area increases step by step along the second direction (Y) toward one end of the heat exchange medium outlet (12). 4. The battery pack according to claim 3, characterized in that one of the sub-flow channels (2022) of the sub-flow sections (2021) is adjacent to the heat exchange medium outlet (12). A plurality of the sub-flow channels (2022) in the sub-flow section (2021) are connected. 5. The battery pack according to claim 3, characterized in that the width of the sub-flow channels (2022) of the plurality of sub-flow sections (2021) is gradually reduced along the second direction (Y). , the spacing between the sub-flow channels (2022) of the plurality of sub-flow sections (2021) in the first direction (X) is gradually reduced along the second direction (Y). 6. The battery pack according to claim 1, characterized in that the distance between two adjacent second flow channels (202) in the first direction (X) is smaller than the distance between two adjacent second flow channels (202). The spacing between the first channels (201) in the first direction (X). 7. The battery pack according to claim 1, wherein opposite ends of the heat exchange plate (100) along the second direction (Y) are respectively provided with heat exchangers extending along the first direction (X). The heat medium inflow groove (21) and the heat exchange medium outflow groove (22), the plurality of first flow channels (201) are connected to the heat exchange medium inlet (11) through the heat exchange medium inflow groove (21), The plurality of second flow channels (202) are connected to the heat exchange medium outlet (12) through the heat exchange medium outflow groove (22). 8. The battery pack according to claim 1, characterized in that 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) The heat exchange plate (100) is formed by sealing connection, and 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 heat exchange medium channels (20) are respectively provided on the opposite surfaces of the base plate (2) and the cover plate (1). 9. The battery pack according to claim 1, characterized in that: the height h of the heat exchange medium channel (20) accounts for 30% of the total thickness H of the heat exchange plate (100) in the third direction (Z). 50%-75%. 10. The battery pack according to claim 1, characterized in that: the heat exchange plate (100) further includes a first joint (3) and a second joint (4), and the first joint (3) passes through The heat exchange medium inlet (11) is connected to the first flow channel (201), and the second joint (4) is connected to the second flow channel (202) through the heat exchange medium outlet (12). 11. The battery pack according to claim 1, further comprising a box body, the box body having an accommodation cavity, and the battery (200) and the heat exchange plate (100) are both located in the accommodation cavity. inside the cavity; or A frame body, the frame body and the heat exchange plate (100) jointly define an accommodation cavity, and the battery (200) is disposed in the accommodation cavity.