Battery pack

Abstract

The application discloses a battery pack, comprising a heat management assembly, a first heat exchange plate, a second heat exchange plate and a battery module, the battery module comprising a plurality of battery monomers arranged along a first direction; the first heat exchange plate is provided with a first port, a second port and a third port, the second heat exchange plate is provided with a fourth port, a fifth port and a sixth port, the heat management assembly comprises a first pipeline in communication with the first port and the fourth port, a second pipeline in communication with the second port and the fifth port, a third pipeline in communication with the third port and the sixth port, a fourth pipeline in communication with the second pipeline and the third pipeline at two ends, and a control valve group, the control valve group is provided with a liquid inlet for inputting fluid to exchange heat with the battery module and a liquid outlet for outputting fluid, the control valve group has a switchable first state and a second state, in the first state, the liquid inlet and the first pipeline are in communication, and the liquid outlet and the fourth pipeline are in communication, in the second state, the liquid inlet and the fourth pipeline are in communication, and the liquid outlet and the first pipeline are in communication.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery pack. Background Art

[0002] With the development of the new energy industry, the market demand for the endurance of power batteries has further increased. In order to achieve a large capacity of battery packs, they are often arranged in multiple rows and layers of battery cells. When the battery cells are arranged in one direction, the size of the battery pack in that direction is larger. The increase in the number of battery cells makes thermal management more difficult, which is mainly reflected in the temperature difference control. The thermal management of battery packs in the existing technology is mostly controlled by liquid cooling plates. The liquid cooling plate usually includes a water inlet and a water outlet. When cooling the battery pack, the battery cells close to the water inlet have a better cooling effect, and the battery cells close to the water outlet have a relatively poor cooling effect, which may cause a large temperature difference in different areas of the battery pack. For battery packs with more and larger battery cells arranged in one direction, due to the concentrated battery cells and poor heat dissipation, the temperature of the battery cells in the middle position is often higher, and the temperature of the battery cells at both ends is relatively lower. When the battery pack is subjected to high-temperature cooling and low-temperature heating, it is more difficult to control the temperature difference. Summary of the Invention

[0003] An object of the present invention is to provide a battery pack that helps reduce the temperature difference between different areas during cooling and heating processes of the battery pack.

[0004] The application discloses a battery pack, comprising a heat management assembly, oppositely arranged first and second heat exchange plates, and a battery module between the first and second heat exchange plates, the first and second heat exchange plates comprising flow channels for fluid, the heat management assembly being configured to supply fluid to the flow channels of the first and second heat exchange plates to exchange heat between the first and second heat exchange plates and the battery module, the battery module comprising a plurality of battery cells arranged in a first direction; the first heat exchange plate is provided with a first port, a second port and a third port in communication with the flow channel thereof, the first port being located in the middle of the first heat exchange plate in the first direction, the second and third ports being located at the two ends of the first heat exchange plate respectively, the second heat exchange plate is provided with a fourth port, a fifth port and a sixth port in communication with the flow channel thereof, the fourth port being located in the middle of the second heat exchange plate in the first direction, the fifth and sixth ports being located at the two ends of the second heat exchange plate respectively, the heat management assembly comprises a first pipeline in communication with the first and fourth ports, a second pipeline in communication with the second and fifth ports, a third pipeline in communication with the third and sixth ports, a fourth pipeline in communication with the second and third pipelines at the two ends respectively, and a control valve group, the control valve group is provided with a liquid inlet for inputting fluid to exchange heat with the battery module and a liquid outlet for outputting the fluid, the control valve group has a first state and a second state which can be switched, in the first state, the liquid inlet and the first pipeline are in communication, and the liquid outlet and the fourth pipeline are in communication, in the second state, the liquid inlet and the fourth pipeline are in communication, and the liquid outlet and the first pipeline are in communication.

[0005] In some embodiments, the control valve group comprises a first hydraulic port in communication with the first pipeline and a second hydraulic port in communication with the fourth pipeline, the control valve group being a two-position four-way directional valve, in the first state, the control valve group is located at a first valve position, the liquid inlet and the first hydraulic port are in communication, and the liquid outlet and the second hydraulic port are in communication, in the second state, the control valve group is located at a second valve position, the liquid inlet and the second hydraulic port are in communication, and the liquid outlet and the first hydraulic port are in communication.

[0006] In some embodiments, a third heat exchange plate is further included between the first heat exchange plate and the second heat exchange plate, the third heat exchange plate including a flow channel for passing fluid to exchange heat with the battery module, and the third heat exchange plate is provided with a seventh port, an eighth port and a ninth port connected to the flow channel. The seventh port is located in the middle of the third heat exchange plate along the first direction, the eighth port and the ninth port are respectively located at two ends of the third heat exchange plate, the first pipe is connected to the seventh port, the second pipe is connected to the eighth port, and the third pipe is connected to the ninth port. The battery module includes a plurality of battery cells located between the first heat exchange plate and the third heat exchange plate and a plurality of battery cells located between the second heat exchange plate and the third heat exchange plate.

[0007] In some embodiments, the flow area of ​​the flow channel between the seventh port and the eighth port is twice the flow area between the first port and the second port, and the flow area of ​​the flow channel between the seventh port and the ninth port is twice the flow area between the first port and the third port; and / or, the flow area of ​​the flow channel between the seventh port and the eighth port is twice the flow area between the fourth port and the fifth port, and the flow area of ​​the flow channel between the seventh port and the ninth port is twice the flow area between the fourth port and the sixth port.

[0008] In some embodiments, the flow channel of the third heat exchange plate includes a first S-shaped flow channel and a second S-shaped flow channel, the two ends of the first S-shaped flow channel are respectively connected to the seventh port and the eighth port, and the two ends of the second S-shaped flow channel are respectively connected to the seventh port and the ninth port.

[0009] In some embodiments, the flow channel of the first heat exchange plate includes a third S-shaped flow channel and a fourth S-shaped flow channel, the two ends of the third S-shaped flow channel are respectively connected to the first port and the second port, and the two ends of the fourth S-shaped flow channel are respectively connected to the first port and the third port.

[0010] In some embodiments, the third heat exchange plate comprises a first inner wall and a second inner wall arranged in parallel and opposite, and comprises a third inner wall and a fourth inner wall arranged in parallel and opposite, the third inner wall is perpendicular to the first inner wall, the seventh port, the eighth port and the ninth port are arranged on the first inner wall, the third heat exchange plate further comprises a plurality of partitions parallel to the third inner wall, the plurality of partitions comprises a plurality of first partition groups and one or more first partition plates, the two ends of the partitions of the first partition group are kept apart from the first inner wall and the second inner wall, the first partition plate is located between two adjacent first partition groups, the two ends of the first partition plate are kept apart from one of the first inner wall and the second inner wall and are sealingly connected to the other one, and the two ends of the adjacent first partition plate are opposite to the keeping apart and the sealing connection of the first inner wall and the second inner wall, the end of the partition of the first partition group closest to the third inner wall is in communication with the eighth port, and the end of the partition of the first partition group farthest from the third inner wall is in communication with the seventh port, the plurality of partitions further comprises a plurality of second partition groups and one or more second partition plates, the two ends of the partitions of the second partition group are kept apart from the first inner wall and the second inner wall, the second partition plate is located between two adjacent second partition groups, the two ends of the second partition plate are kept apart from one of the first inner wall and the second inner wall and are sealingly connected to the other one, and the two ends of the adjacent second partition plate are opposite to the keeping apart and the sealing connection of the first inner wall and the second inner wall, the end of the partition of the second partition group closest to the fourth inner wall is in communication with the ninth port, and the end of the partition of the second partition group farthest from the fourth inner wall is in communication with the seventh port.

[0011] In some embodiments, the first heat exchange plate includes a fifth inner wall and a sixth inner wall arranged in parallel and opposite to each other, and a seventh inner wall and an eighth inner wall arranged in parallel and opposite to each other, the seventh inner wall is perpendicular to the fifth inner wall, the first port, the second port and the third port are arranged on the fifth inner wall, the first heat exchange plate also includes a plurality of partitions parallel to the seventh inner wall, the plurality of partitions include a plurality of third partition plate groups and more than one third partition plates, both ends of the partitions of the third partition plate group maintain a gap with the fifth inner wall and the sixth inner wall, the third partition plate is located between two adjacent third partition plate groups, both ends of the third partition plate maintain a gap with one of the fifth inner wall and the sixth inner wall, and are sealed with the other one, and both ends of the adjacent third partition plates maintain a gap and are sealed with the fifth inner wall and the sixth inner wall. On the contrary, the end of the partition of the third partition plate group adjacent to the seventh inner wall is connected to the second port, and the end of the partition of the third partition plate group farthest from the seventh inner wall is connected to the first port. The multiple partitions also include multiple fourth partition plate groups and more than one fourth partition plate. The two ends of the partition of the fourth partition plate group maintain a gap with the fifth inner wall and the sixth inner wall. The fourth partition plate is located between two adjacent fourth partition plate groups. The two ends of the fourth partition plate maintain a gap with one of the fifth inner wall and the sixth inner wall, and are sealed with the other one. The gap and sealed connection between the two ends of the adjacent fourth partition plate and the fifth inner wall and the sixth inner wall are opposite. The end of the partition of the fourth partition plate group adjacent to the eighth inner wall is connected to the third port, and the end of the partition of the fourth partition plate group farthest from the eighth inner wall is connected to the first port.

[0012] In some embodiments, the number of partitions in the first partition group plus 1 is twice the number of partitions in the third partition group plus 1, and the number of partitions in the second partition group plus 1 is twice the number of partitions in the fourth partition group plus 1.

[0013] Based on the battery pack provided by the present invention, the first heat exchange plate and the second heat exchange plate can perform heat exchange to cool or heat the battery module located therebetween. During cooling, the control valve group is in a first state, and the cooling fluid can flow in through the first port of the first heat exchange plate and the fourth port of the second heat exchange plate through the first pipe, and then flow out through the second port, the third port, the fifth port, and the sixth port, thereby entering the battery pack from the middle along the first direction and flowing out from both ends, thereby reducing the temperature difference between the middle region and the end regions of the battery pack. During heating, the control valve group is in a second state, and the cooling fluid can flow in through the fourth pipe from the second port, the third port of the first heat exchange plate and the fifth port, and the sixth port of the second heat exchange plate, thereby flowing out through the first port and the fourth port, thereby entering the battery pack from both ends along the first direction and flowing out from the middle, thereby reducing the temperature difference between the middle region and the end regions of the battery pack.

[0014] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 Schematic diagram of the structure of a battery pack according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of a partial structure of a battery pack shown;

[0018] Figure 3 for Figure 2 A schematic structural diagram of a portion of the structure shown;

[0019] Figure 4 for Figure 3 A schematic structural diagram of a portion of the structure shown;

[0020] Figure 5 for Figure 4 The schematic diagram of the structural principle of the control valve group shown in FIG.

[0021] Figure 6 for Figure 2 A schematic cross-sectional view of the third heat exchange plate of the battery pack shown;

[0022] Figure 7 for Figure 2 The cross-sectional structural diagram of the first heat exchange plate of the battery pack is shown. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0025] In the description of the present invention, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0028] The battery pack of this embodiment includes a thermal management assembly, a first heat exchange plate 11 and a second heat exchange plate 12 arranged in opposite directions, and a battery module 4 positioned between the first and second heat exchange plates 11, 12. The first and second heat exchange plates 11, 12 include flow channels for passing fluid. The thermal management assembly is used to pass fluid into the flow channels of the first and second heat exchange plates 11, 12 to enable heat exchange between the first and second heat exchange plates 11, 12 and the battery module 4. Fluid is passed through the flow channels of the first and second heat exchange plates 11, 12, and the fluid flows within the flow channels of the first and second heat exchange plates, thereby enabling heat exchange between the first and second heat exchange plates and the battery module 4, thereby cooling or heating the battery module 4. The fluid may be, for example, water, an ethylene glycol solution, or the like.

[0029] The battery module 4 includes a plurality of battery cells 41 arranged along a first direction. In the embodiment shown in the figure, three or more battery cells are arranged along the length direction of the battery pack, two battery cells are arranged along the width direction of the battery pack, and two battery cells are arranged along the height direction of the battery pack. The first direction can be the width direction, length direction or height direction of the battery pack. Figure 1 In the illustrated embodiment, the first direction is the width direction of the battery pack.

[0030] like Figures 1 to 3 As shown, the first heat exchange plate 11 is provided with a first port 21, a second port 22, and a third port 23 that communicate with the flow channel of the first heat exchange plate 11. Along the first direction, the first port 21 is located in the middle of the first heat exchange plate 11, while the second port 22 and the third port 23 are located at opposite ends of the first heat exchange plate 11. That is, along the first direction, the second port 22 and the third port 23 are located on either side of the first port 21. The second heat exchange plate 12 is provided with a fourth port 24, a fifth port 25, and a sixth port 26 that communicate with the flow channel thereof. Along the first direction, the fourth port 24 is located in the middle of the second heat exchange plate 12, while the fifth port 25 and the sixth port 26 are located at opposite ends of the second heat exchange plate 12. That is, along the first direction, the fifth port 25 and the sixth port 26 are located on either side of the fourth port 24. The thermal management assembly includes a first conduit 31 communicating with both the first port 21 and the fourth port 24, a second conduit 32 communicating with both the second port 22 and the fifth port 25, a third conduit 33 communicating with both the third port 23 and the sixth port 26, a fourth conduit 34 communicating at both ends with the second conduit 32 and the third conduit 33, respectively, and a control valve assembly 5. The control valve assembly 5 is provided with a liquid inlet 51 for inputting fluid for heat exchange with the battery module 4, and a liquid outlet 52 for outputting fluid. The control valve assembly 5 has a switchable first state and a second state. In the first state, the liquid inlet 51 communicates with the first conduit 31, and the liquid outlet 52 communicates with the fourth conduit 34. In the second state, the liquid inlet 51 communicates with the fourth conduit 34, and the liquid outlet 52 communicates with the first conduit 31.

[0031] When the battery pack temperature is high and needs to be cooled, the control valve group is switched to the first state. The cooling fluid enters the first pipe 31 from the liquid inlet 51 of the control valve group, then flows from the first pipe 31 to the first port 21 and the fourth port 24, respectively. The fluid entering the first port 21 enters the flow channel of the first heat exchange plate and flows therein to cool the battery module 4. It then flows out from the second port 22 and the third port 23 at both ends of the first heat exchange plate to the second and third pipes, respectively. It then flows through the second and third pipes into the fourth pipe, and then flows out from the liquid outlet 52 through the fourth pipe. The fluid entering the fourth port 24 enters the flow channel of the second heat exchange plate and flows therein to cool the battery module 4. It then flows out from the fifth port 25 and the sixth port 26 at both ends of the second heat exchange plate to the second and third pipes, respectively. It then flows through the second and third pipes into the fourth pipe, and then flows out from the liquid outlet 52 through the fourth pipe. When the battery pack is in a high-temperature state, the temperature of the area in the middle along the first direction is higher than that at both ends. During cooling, the fluid enters from the middle of the first heat exchange plate and the second heat exchange plate and exits from the two ends. The cooling effect of the middle area of ​​the battery module is better, which can reduce the temperature difference between the middle area and the two end areas of the battery pack.

[0032] When the battery pack temperature is low and the battery pack needs to be heated, the control valve group is switched to the second state, and the fluid for heating enters the fourth pipe 34 from the liquid inlet 51 of the control valve group, and then flows into the second pipe 32 and the third pipe 33 respectively. The fluid entering the second pipe 32 flows into the second port 22 and the fifth port 25 respectively, and enters the first heat exchange plate 11 and the second heat exchange plate 12 through the second port 22 and the fifth port 25 respectively. Then, after flowing in the flow channels of the first heat exchange plate 11 and the second heat exchange plate 12 and heating the battery module, it flows out from the first port 21 and the fourth port 24 to the first pipe 31 respectively, and then flows out from the liquid outlet 52 connected to the first pipe 31. The fluid entering the third pipe 33 flows into the third port 23 and the sixth port 26, respectively, and enters the first heat exchange plate 11 and the second heat exchange plate 12 through the third port 23 and the sixth port 26, respectively. After flowing through the flow channels of the first and second heat exchange plates 11 and 12 and heating the battery modules, the fluid flows out of the first port 21 and the fourth port 24, respectively, into the first pipe 31, and then out of the liquid outlet 52 connected to the first pipe 31. When the battery pack is at a relatively low temperature, the temperature of the areas at the ends along the first direction is lower than that in the center. During heating, the fluid enters the ends of the first and second heat exchange plates and exits the center. This results in a better heating effect at the ends of the battery module than in the center, reducing the temperature difference between the center and the ends of the battery pack.

[0033] In some embodiments, as Figure 4 and Figure 5As shown, the control valve group 5 includes a first hydraulic port 54 communicating with the first pipeline 31 and a second hydraulic port 53 communicating with the fourth pipeline 34 (at Figure 5 In the embodiment shown, the liquid inlet 51, the liquid outlet 52, the first hydraulic port 54 and the second hydraulic port 53 of the control valve group correspond to Figure 5 The control valve group 5 is a two-position four-way reversing valve. In the first state, the control valve group 5 is located in the first valve position, the liquid inlet 51 is connected to the first hydraulic port 54, and the liquid outlet 52 is connected to the second hydraulic port 53. In the second state, the control valve group 5 is located in the second valve position, the liquid inlet 51 is connected to the second hydraulic port 53, and the liquid outlet 52 is connected to the first hydraulic port 54.

[0034] In some embodiments, as Figures 1 to 3 As shown, the battery pack also includes a third heat exchange plate 13 located between the first heat exchange plate 11 and the second heat exchange plate 12. The third heat exchange plate 13 includes a flow channel for passing a fluid to exchange heat with the battery module 4. The third heat exchange plate 13 is provided with a seventh port 27, an eighth port 28, and a ninth port 29 connected to the flow channel. Along the first direction, the seventh port 27 is located in the middle of the third heat exchange plate 13, and the eighth port 28 and the ninth port 29 are located at opposite ends of the third heat exchange plate 13. That is, along the first direction, the eighth port 28 and the ninth port 29 are located on either side of the seventh port 27. A first pipe 31 is connected to the seventh port 27, a second pipe 32 is connected to the eighth port 28, and a third pipe 33 is connected to the ninth port 29. The battery module 4 includes a plurality of battery cells 41 located between the first and third heat exchange plates 11 and 13, and a plurality of battery cells 41 located between the second and third heat exchange plates 12 and 13. In this embodiment, when cooling the battery pack, fluid entering the control valve assembly's liquid inlet can flow through the first pipe from the seventh port 27 into the flow channel of the third heat exchange plate, cooling the battery cells located above and below the third heat exchange plate. The fluid then flows out of the eighth and ninth ports 28 and 29 to the first and third pipes. When heating the battery pack, fluid entering the control valve assembly's liquid inlet can flow through the second and third pipes into the eighth and ninth ports 28 and 29, thereby flowing into the flow channel of the third heat exchange plate, heating the battery cells located above and below the third heat exchange plate, and then out of the seventh port 27. This allows the fluid to flow into the middle of the third heat exchange plate and out of both ends when cooling the battery pack, and to flow into the third heat exchange plate and out of the middle when heating the battery pack. The third heat exchange plate effectively exchanges heat with the battery cells located in the portion of the battery module between the first and second heat exchange plates.

[0035] In some embodiments, the flow area of ​​the flow channel between the seventh port 27 and the eighth port 28 is twice the flow area of ​​the flow channel between the first port 21 and the second port 22, and the flow area of ​​the flow channel between the seventh port 27 and the ninth port 29 is twice the flow area of ​​the flow channel between the first port 21 and the third port 23. The flow area is also the cross-sectional area of ​​the flow channel. In this embodiment, when cooling and heating the battery pack, the flow rate of the fluid flowing between the seventh port 27 and the ninth port 29 is greater than that between the first port 21 and the third port 23, nearly twice. Since the third heat exchange plate contacts the battery cells on both the upper and lower surfaces at the same time, the heat exchange demand is greater. This embodiment can make the distribution of the fluid flow rate between the seventh port 27 and the ninth port 29 and the fluid flow rate between the first port 21 and the third port 23 more coordinated. The flow area of ​​the flow channel between the seventh port 27 and the eighth port 28 is twice the flow area of ​​the flow channel between the fourth port 24 and the fifth port 25. The flow area of ​​the flow channel between the seventh port 27 and the ninth port 29 is twice the flow area of ​​the flow channel between the fourth port 24 and the sixth port 26. In this embodiment, when cooling and heating the battery pack, the flow rate of the fluid flowing between the seventh port 27 and the ninth port 29 is greater than that between the fourth port 24 and the fifth port 25, nearly twice as much. Because the third heat exchange plate is in contact with the battery cells on both its top and bottom surfaces, the heat exchange demand is greater. This embodiment can achieve a more coordinated distribution of the fluid flow between the seventh port 27 and the ninth port 29 and the fluid flow between the fourth port 24 and the fifth port 25.

[0036] In some embodiments, as Figure 6 As shown, the flow channels of the third heat exchange plate 13 include a first S-shaped channel and a second S-shaped channel. The two ends of the first S-shaped channel are connected to the seventh port 27 and the eighth port 28, respectively. The two ends of the second S-shaped channel are connected to the seventh port 27 and the ninth port 29, respectively. Fluid flowing in the first S-shaped channel, for example, from the eighth port 28 into one end of the first S-shaped channel, will first flow away from the eighth port 28 to one end, then turn back and flow toward the eighth port 28, forming an S-shaped flow direction. The flow in the second S-shaped channel is similar. The channel shape of this embodiment can improve the heat exchange efficiency between the third heat exchange plate and the battery cells.

[0037] In some embodiments, as Figure 7As shown, the flow channel of the first heat exchange plate 11 includes a third S-shaped flow channel and a fourth S-shaped flow channel. The two ends of the third S-shaped flow channel are connected to the first port 21 and the second port 22, respectively. The two ends of the fourth S-shaped flow channel are connected to the first port 21 and the third port 23, respectively. A fluid flowing in the third S-shaped flow channel, for example, after flowing from the second port 22 into one end of the third S-shaped flow channel, will first flow away from the second port 22 to one end, then turn back and flow toward the second port 22, forming an S-shaped flow direction. The flow in the fourth S-shaped flow channel is similar. The flow channel shape arrangement of this embodiment can improve the heat exchange effect between the first heat exchange plate and the battery cell. In some embodiments, the flow channel arrangement of the second heat exchange plate is the same as that of the first heat exchange plate.

[0038] In some embodiments, as Figure 6 As shown, the third heat exchange plate 13 includes a first inner wall 61 and a second inner wall 62 arranged in parallel and opposite to each other, and a third inner wall 63 and a fourth inner wall 64 arranged in parallel and opposite to each other. The third inner wall 63 is perpendicular to the first inner wall 61. The seventh port 27, the eighth port 28 and the ninth port 29 are provided on the first inner wall 61. The third heat exchange plate 13 also includes a plurality of partitions parallel to the third inner wall 63. The plurality of partitions include a plurality of first partition groups 711 and one or more first partition plates 712. Both ends of the partitions of the first partition group 711 maintain a gap with the first inner wall 61 and the second inner wall 62, so that a flow channel through which fluid can flow is formed between the two ends of the partitions of the first partition group 711 and the first inner wall 61 and the second inner wall 62. The first partition plate 712 is located between two adjacent first partition groups 711, that is, the first partition plate separates adjacent first partition groups 711. As shown in FIG. Figure 6In the illustrated embodiment, both ends of the first partition plate 712 maintain a gap with one of the first inner wall 61 and the second inner wall 62, and are sealed with the other. That is, when one end of the first partition plate 712 maintains a gap with the first inner wall 61, the other end of the first partition plate 712 is sealed with the second inner wall 62. When one end of the first partition plate 712 is sealed with the first inner wall 61, the other end of the first partition plate 712 maintains a gap with the second inner wall 62. The gaps maintained and the sealed connections between the two ends of adjacent first partition plates 712 and the first inner wall 61 and the second inner wall 62 are opposite. That is, one of the two adjacent first partition plates maintains a gap with the first inner wall 61 and is sealed with the second inner wall, while the other is sealed with the first inner wall 61 and maintains a gap with the second inner wall 62. The end of the partition of the first partition plate group 711 adjacent to the third inner wall 63 is connected to the eighth port 28. The connection between the end of the partition plate and the eighth port 28 means that the flow channel formed between the partition plates or between the partition plates and the inner wall is connected to the eighth port 28 at the end. In the embodiment shown in the figure, the end of the partition plate of the first partition plate group 711 is connected to the eighth port by maintaining a gap with the first inner wall. The end of the partition plate of the first partition plate group 711 farthest from the third inner wall 63 is connected to the seventh port 27. Figure 6 In the embodiment shown, the partition is connected to the seventh port 27 by maintaining a gap with the first inner wall. Figure 6In the embodiment shown, four first baffle groups are included, and the first baffle group includes three baffles. Four flow paths are formed between the first baffle group adjacent to the first inner wall and the first inner wall and the adjacent first partition plate. When fluid flows into the eighth port 28, the fluid flows into the four flow paths from the end of the first baffle group, then flows to the other end of the first baffle group, and flows from the other end to the four flow paths formed by the next first baffle group, and then flows along the four flow paths toward the eighth port 28, forming an S-shaped flow. The multiple partitions also include multiple second partition groups 721 and more than one second partition plates 722. The two ends of the partitions of the second partition group 721 maintain gaps with the first inner wall 61 and the second inner wall 62. The second partition plate 722 is located between two adjacent second partition groups 721. The two ends of the second partition plate 722 maintain a gap with one of the first inner wall 61 and the second inner wall 62, and are sealed with the other one. That is, when one end of the second partition plate 722 maintains a gap with the first inner wall 61, the other end of the second partition plate 722 is sealed with the second inner wall 62. When one end of the second partition plate 722 is sealed with the first inner wall 61, the other end of the second partition plate 722 maintains a gap with the second inner wall 62. The ends of adjacent second partition plates 722 maintain gaps and sealed connections with the first inner wall 61 and the second inner wall 62 in opposite ways. That is, one of the two adjacent second partition plates 722 maintains a gap with the first inner wall 61 and is sealed with the second inner wall, while the other maintains a sealed connection with the first inner wall 61 and maintains a gap with the second inner wall. The end of the partition plate of the second partition plate group 721 adjacent to the fourth inner wall 64 is connected to the ninth port 29, and this partition plate is connected to the ninth port 29 by maintaining a gap with the first inner wall. The end of the partition plate of the second partition plate group 721 farthest from the fourth inner wall 64 is connected to the seventh port 27, and similarly, this partition plate is connected to the seventh port 27 by maintaining a gap with the first inner wall. The arrangement of the second partition plate group 721 and the second partition plates is similar to that of the first partition plate group 711 and the first partition plate. In the embodiment shown in the figure, the second partition plate group 721 and the second partition plates are arranged symmetrically with the first partition plate group and the first partition plate.

[0039] In some embodiments, as Figure 7As shown, the first heat exchange plate 11 includes a fifth inner wall 65 and a sixth inner wall 66 arranged in parallel and opposite to each other, and a seventh inner wall 67 and an eighth inner wall 68 arranged in parallel and opposite to each other, the seventh inner wall 67 and the fifth inner wall 65 are perpendicular, the first port 21, the second port 22 and the third port 23 are arranged on the fifth inner wall 65, the first heat exchange plate 11 also includes a plurality of partitions parallel to the seventh inner wall 67, the plurality of partitions include a plurality of third partition plate groups 731 and more than one third partition plate 732, both ends of the partitions of the third partition plate group 731 maintain a gap with the fifth inner wall 65 and the sixth inner wall 66, the third partition plate 732 is located between two adjacent third partition plate groups 731, both ends of the third partition plate 732 maintain a gap with one of the fifth inner wall 65 and the sixth inner wall 66, and are sealed with the other one, and the gaps and sealed connections between the two ends of the adjacent third partition plates 732 and the fifth inner wall 65 and the sixth inner wall 66 are opposite, tightly The end of the partition of the third partition plate group 731 adjacent to the seventh inner wall 67 is connected to the second port 22, and the end of the partition of the third partition plate group 731 farthest from the seventh inner wall 67 is connected to the first port 21. The multiple partitions also include multiple fourth partition plate groups 741 and one or more fourth partition plates 742. Both ends of the partitions of the fourth partition plate group 741 maintain gaps with the fifth inner wall 65 and the sixth inner wall 66. The fourth partition plate 742 is located between two adjacent fourth partition plate groups 741. Both ends of the fourth partition plate 742 maintain a gap with one of the fifth inner wall 65 and the sixth inner wall 66, and are sealed with the other one. The gap and sealed connection between the two ends of the adjacent fourth partition plate 742 and the fifth inner wall 65 and the sixth inner wall 66 are opposite. The end of the partition of the fourth partition plate group 741 adjacent to the eighth inner wall 68 is connected to the third port 23, and the end of the partition of the fourth partition plate group 741 farthest from the eighth inner wall 68 is connected to the first port 21. The arrangement of the third partition plate group, the third separator plate, the fourth partition plate group and the fourth separator plate in the first heat exchange plate is similar to the arrangement of the first partition plate group, the first separator plate, the second partition plate group and the second separator plate of the third heat exchange plate in the above embodiment. The main difference is that the number of partitions in the third partition plate group and the fourth partition plate group is less than the number of partitions in the first partition plate group and the second partition plate group, and the number of the third separator plate and the fourth separator plate is more than the number of the first separator plate and the second separator plate.

[0040] In some embodiments, as Figure 6 and Figure 7As shown, the result of adding 1 to the number of the first partition plate group 711 is twice the result of adding 1 to the number of the third partition plate group 731, and the result of adding 1 to the number of the second partition plate group 721 is twice the result of adding 1 to the number of the fourth partition plate group 741. The number of parallel flow paths formed by the partition plates of the first partition plate group is twice the number of parallel flow paths of the third partition plate group 731, and the number of parallel flow paths of the second partition plate group 721 is twice the number of parallel flow paths of the fourth partition plate group 741, so that the flow rate of the fluid can be more evenly distributed.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit the present application; although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, all of them should be covered in the technical solution range of the present application.

Claims

1. A battery pack, characterized in that: The heat exchanger of claim 1, wherein the heat exchanger has a first port and a second port located at the bottom of the heat exchanger, wherein the heat exchanger has a first port and a second port located at the bottom of the heat exchanger, wherein the heat exchanger has a second port and a third ... In the middle of the second heat exchange plate, the fifth port and the sixth port are respectively located at the two ends of the second heat exchange plate, and the thermal management component includes a first pipe communicating with the first port and the fourth port, a second pipe communicating with the second port and the fifth port, a third pipe communicating with the third port and the sixth port, a fourth pipe whose two ends are respectively connected to the second pipe and the third pipe, and a control valve group, the control valve group is provided with a liquid inlet for inputting fluid for heat exchange with the battery module and a liquid outlet for outputting the fluid, the control valve group has a switchable first state and a second state, in the first state, the liquid inlet is connected to the first pipe, and the liquid outlet is connected to the fourth pipe, and in the second state, the liquid inlet is connected to the fourth pipe, and the liquid outlet is connected to the first pipe.

2. The battery pack according to claim 1, wherein: The control valve group includes a first hydraulic port communicating with the first pipeline and a second hydraulic port communicating with the fourth pipeline. The control valve group is a two-position four-way reversing valve. In the first state, the control valve group is located in the first valve position, the liquid inlet is communicated with the first hydraulic port, and the liquid outlet is communicated with the second hydraulic port. In the second state, the control valve group is located in the second valve position, the liquid inlet is communicated with the second hydraulic port, and the liquid outlet is communicated with the first hydraulic port.

3. The battery pack according to claim 1, wherein: It also includes a third heat exchange plate located between the first heat exchange plate and the second heat exchange plate, the third heat exchange plate including a flow channel for passing fluid to exchange heat with the battery module, and the third heat exchange plate is provided with a seventh port, an eighth port and a ninth port connected to the flow channel. Along the first direction, the seventh port is located in the middle of the third heat exchange plate, and the eighth port and the ninth port are respectively located at two ends of the third heat exchange plate. The first pipe is connected to the seventh port, the second pipe is connected to the eighth port, and the third pipe is connected to the ninth port. The battery module includes a plurality of battery cells located between the first heat exchange plate and the third heat exchange plate and a plurality of battery cells located between the second heat exchange plate and the third heat exchange plate.

4. The battery pack according to claim 3, wherein: The flow area of ​​the flow passage between the seventh port and the eighth port is twice the flow area of ​​the flow passage between the first port and the second port, and the flow area of ​​the flow passage between the seventh port and the ninth port is twice the flow area of ​​the flow passage between the first port and the third port; And / or, the flow area of ​​the flow channel between the seventh port and the eighth port is twice the flow area of ​​the flow channel between the fourth port and the fifth port, and the flow area of ​​the flow channel between the seventh port and the ninth port is twice the flow area of ​​the flow channel between the fourth port and the sixth port.

5. The battery pack according to claim 3 or 4, wherein: The flow channel of the third heat exchange plate includes a first S-shaped flow channel and a second S-shaped flow channel. Both ends of the first S-shaped flow channel are respectively connected to the seventh port and the eighth port. Both ends of the second S-shaped flow channel are respectively connected to the seventh port and the ninth port.

6. The battery pack according to claim 5, wherein: The flow channel of the first heat exchange plate includes a third S-shaped flow channel and a fourth S-shaped flow channel. Both ends of the third S-shaped flow channel are respectively connected to the first port and the second port. Both ends of the fourth S-shaped flow channel are respectively connected to the first port and the third port.

7. The battery pack according to claim 6, wherein: The heat exchanger plate includes a first inner wall and a second inner wall arranged in parallel and opposite to each other, and a third inner wall and a fourth inner wall arranged in parallel and opposite to each other, the third inner wall being perpendicular to the first inner wall, the seventh port, the eighth port and the ninth port being arranged on the first inner wall, the third heat exchanger plate further includes a plurality of partitions parallel to the third inner wall, the plurality of partitions including a plurality of first partition plate groups and one or more first partition plates, both ends of the partitions of the first partition plate group maintain a gap with the first inner wall and the second inner wall, the first partition plate is located between two adjacent first partition plate groups, both ends of the first partition plate maintain a gap with one of the first inner wall and the second inner wall, and are sealed with the other one, and the gaps and sealed connections between the two ends of the adjacent first partition plates and the first inner wall and the second inner wall are opposite, tightly connected. The end of the partition of the first partition group adjacent to the third inner wall is connected to the eighth port, and the end of the partition of the first partition group farthest from the third inner wall is connected to the seventh port. The multiple partitions also include multiple second partition groups and more than one second partition plates. The ends of the partitions of the second partition group maintain gaps with the first inner wall and the second inner wall. The second partition plate is located between two adjacent second partition groups. The two ends of the second partition plate maintain a gap with one of the first inner wall and the second inner wall, and are sealed with the other one. The gaps and sealed connections between the two ends of the adjacent second partition plates and the first inner wall and the second inner wall are opposite. The end of the partition of the second partition group adjacent to the fourth inner wall is connected to the ninth port, and the end of the partition of the second partition group farthest from the fourth inner wall is connected to the seventh port.

8. The battery pack according to claim 7, wherein: The first heat exchange plate includes a fifth inner wall and a sixth inner wall arranged in parallel and opposite to each other, and a seventh inner wall and an eighth inner wall arranged in parallel and opposite to each other, the seventh inner wall and the fifth inner wall being perpendicular to each other, the first port, the second port and the third port being arranged on the fifth inner wall, the first heat exchange plate also includes a plurality of partitions parallel to the seventh inner wall, the plurality of partitions including a plurality of third partition plate groups and more than one third partition plates, both ends of the partitions of the third partition plate group maintain a gap with the fifth inner wall and the sixth inner wall, the third partition plate is located between two adjacent third partition plate groups, both ends of the third partition plate maintain a gap with one of the fifth inner wall and the sixth inner wall, and are sealed with the other one, and the gaps and sealed connections between the two ends of the adjacent third partition plates and the fifth inner wall and the sixth inner wall are opposite, tightly connected. The two ends of the partition of the third partition plate group adjacent to the seventh inner wall are connected to the second port, and the end of the partition of the third partition plate group farthest from the seventh inner wall is connected to the first port. The multiple partitions also include multiple fourth partition plate groups and more than one fourth partition plate. The two ends of the partition of the fourth partition plate group maintain a gap with the fifth inner wall and the sixth inner wall. The fourth partition plate is located between two adjacent fourth partition plate groups. The two ends of the fourth partition plate maintain a gap with one of the fifth inner wall and the sixth inner wall, and are sealed with the other one. The gap and sealed connection between the two ends of the adjacent fourth partition plate and the fifth inner wall and the sixth inner wall are opposite. The end of the partition of the fourth partition plate group adjacent to the eighth inner wall is connected to the third port, and the end of the partition of the fourth partition plate group farthest from the eighth inner wall is connected to the first port.

9. The battery pack according to claim 8, wherein: The number of partitions in the first partition plate group plus 1 is twice the number of partitions in the third partition plate group plus 1, and the number of partitions in the second partition plate group plus 1 is twice the number of partitions in the fourth partition plate group plus 1.

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