CN111900512B

CN111900512B - Battery component

Info

Publication number: CN111900512B
Application number: CN201910367857.XA
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2019-05-05
Filing date: 2019-05-05
Publication date: 2023-06-23
Anticipated expiration: 2039-05-05
Also published as: CN111900512A

Abstract

The technical scheme of the invention provides a battery assembly, which comprises a temperature equalizing device, wherein the temperature equalizing device comprises a first plate and a second plate, a first flow passage is formed in the temperature equalizing device, and the first plate and the second plate are fixed and the joint is sealed. The first plate comprises a first plate surface and the second plate comprises a second plate surface, and the first plate surface is in direct or indirect contact with the battery. The battery assembly further comprises a heat exchange device, the heat exchange device comprises a third plate and a fourth plate, and a second flow passage is formed in the heat exchange device. The third plate further comprises a third plate surface corresponding to the second plate surface, the third plate surface is fixed with the fourth plate surface, the joint of the third plate surface and the fourth plate surface is sealed, and the third plate surface is in direct or indirect contact with the second plate surface. The temperature equalizing device is arranged between the battery and the heat exchanging device, so that the heat exchanging device exchanges heat with the battery through the temperature equalizing device, and the heat transfer uniformity between the heat exchanging device and the battery can be improved, thereby improving the temperature uniformity of the battery.

Description

Battery component

Technical Field

The invention relates to the field of batteries, in particular to a battery assembly.

Background

The battery of the electric vehicle or the hybrid electric vehicle generates heat when being charged and discharged, and the battery needs to be cooled in order to enable the battery to work normally. The battery is typically cooled using a battery cooling device, which is typically in thermal contact with the battery assembly via a thermally conductive pad. With intensive research on battery performance, there is a greater demand for temperature uniformity in current batteries, and thus, the demand for uniformity of heat transfer between a cooling device and a battery pack is also increasing.

Disclosure of Invention

The technical scheme of the invention provides a battery assembly, which comprises a battery, wherein the battery assembly comprises a temperature equalizing device, the temperature equalizing device comprises a first plate and a second plate, the first plate and the second plate are fixed and the joint is sealed, a first flow channel is formed in the temperature equalizing device, the first plate is provided with a first plate surface, the second plate is provided with a second plate surface, and the first plate surface is in direct or indirect contact with the battery;

the battery assembly further comprises a heat exchange device, the temperature equalization device is arranged between the heat exchange device and the battery, the heat exchange device comprises a third plate and a fourth plate, the third plate and the fourth plate are fixed and the joint is sealed, and a second flow channel is formed in the heat exchange device; the heat exchange device further comprises a first interface and a second interface, the first interface is communicated with one end of the second flow channel, the second interface is communicated with the other end of the second flow channel, the third plate is provided with a third plate surface corresponding to the second plate surface, the third plate surface is in direct or indirect contact with the second plate surface, and the temperature equalizing device is detachably fixed with the heat exchange device, so that the heat exchange device can exchange heat with the battery through the temperature equalizing device.

In the battery pack provided by the scheme, the temperature equalizing device is arranged between the battery and the heat exchange device, so that the heat exchange device exchanges heat with the battery through the temperature equalizing device, the heat transfer uniformity between the heat exchange device and the battery can be improved, and the temperature uniformity of the battery is improved.

Drawings

FIG. 1 shows a schematic perspective view of one embodiment of the present invention;

FIG. 2 shows a schematic view, partially in section, of the battery assembly of FIG. 1 taken along line A-A;

FIG. 3 shows an exploded view of the battery assembly of FIG. 1;

FIG. 4 shows a schematic cross-sectional view of the battery assembly of FIG. 1 along line C-C;

FIG. 5 shows a schematic perspective view of another embodiment of the present invention;

FIG. 6 shows a schematic partial cross-sectional view of the battery assembly of FIG. 5 taken along line B-B;

FIG. 7 shows an enlarged partial schematic view of the battery assembly of FIG. 6;

FIG. 8 shows a schematic cross-sectional view of yet another embodiment of the invention;

FIG. 9 shows a schematic perspective view of yet another embodiment of the present invention;

FIG. 10 shows a schematic cross-sectional view of yet another embodiment of the present invention;

FIG. 11 shows a system schematic of an embodiment of the present invention;

fig. 12 shows a system schematic of another embodiment of the invention.

Detailed Description

As shown in fig. 1 to 3, in one embodiment of the battery assembly, which includes the battery 5, the battery assembly includes the temperature equalizing device 1, and the temperature equalizing device 1 includes the first plate 13 and the second plate 12. The first plate and the second plate are fixed and the joint is sealed, a first flow channel 16 is formed in the temperature equalizing device 1, the first plate 13 comprises a first plate surface 11, the second plate 12 comprises a second plate surface 19, and the first plate surface is in direct or indirect contact with the battery 5. It should be noted that "indirect contact" means that other components, such as a heat conductive pad, an adhesive material, and the like, may be disposed between the battery 5 and the first plate surface 11.

The battery assembly further comprises a heat exchange device 3, the temperature equalizing device 1 is arranged between the heat exchange device 3 and the battery 5, the heat exchange device 3 comprises a third plate 31 and a fourth plate 32, and a second flow passage 36 is formed in the heat exchange device 3. The heat exchange device 3 further comprises a first interface 34 and a second interface 35, the first interface 34 is communicated with one end of the second flow channel 36, the second interface is communicated with the other end of the second flow channel, the third plate 31 further comprises a third plate surface 37 corresponding to the second plate surface 19, and the third plate is fixed with the fourth plate and the joint is sealed. Fluid may enter the second flow path 36 from the first port 34 and exit from the second port 35. The battery assembly further includes a second fin 38, the second fin 38 being disposed in the second flow channel.

As shown in fig. 2, the second plate surface 19 is in direct or indirect contact with the third plate surface 37 when the battery assembly is in the mounted state. The heat exchange device 3 indirectly exchanges heat with the battery 5 through the temperature equalizing device 1, and the temperature equalizing device 1 improves the heat transfer uniformity between the heat exchange device 3 and the battery 5. This is because a first flow passage is provided in a part of the region between the heat exchange device 3 and the battery 5, and the liquid is contained in the first flow passage, so that the specific heat of the liquid in the first flow passage is large. The temperature change of the heat exchange device 3 does not affect the first plate surface 11 of the temperature equalizing device 1 immediately, and the temperature change of the third plate surface 37 of the heat exchange device is delayed from the first plate surface 11. It should be noted that "indirect contact" means that other components, such as a thermal pad, may be disposed between the second plate surface 19 and the third plate surface 37.

The second flow channels 36 are disposed in correspondence with the first flow channels 16, and the first flow channels 16 may extend in a direction parallel or substantially parallel to the first plate surface 11, and the second flow channels 36 may also extend in a direction parallel or substantially parallel to the first plate surface 11. The liquid in the first flow channel can exchange heat with the fluid in the second flow channel.

The temperature equalizing device 1 further comprises a third interface 14 and a fourth interface 15, wherein the third interface is communicated with one end of the first flow channel 16, and the fourth interface is communicated with the other end of the first flow channel 16. Fluid can enter the first flow channel 16 through the third port 14 and then flow out through the fourth port 15. The temperature equalizing device further includes a first fin 18, where the first fin 18 is disposed in the first flow channel 16, and the first fin may be a spoiler fin. The third interface is communicated with an inlet of an external water pump, the fourth interface is communicated with an outlet of the external water pump, and fluid flowing into the temperature equalizing device 1 can circularly flow between the temperature equalizing device 1 and the external water pump. So that the heat exchange device can exchange heat with the temperature equalizing device, and the temperature equalizing device can exchange heat with the battery. During the flowing process, the cold and hot parts of the fluid in the temperature equalizing device 1 can be mixed, so that the temperature uniformity of the first plate surface 11 of the temperature equalizing device 1 can be relatively high. The first fins 18 can play a role of disturbing the fluid, so that the cold fluid and the hot fluid can be mixed more fully, and the temperature uniformity of the temperature equalizing device 1 can be further improved.

The battery 5 may include a plurality of

battery cells

51,52,53, and the first plate surface 11 may be in direct or indirect contact with each of the

battery cells

51,52,53, and each of the battery cells is disposed corresponding to the first flow channel 16, such that temperature uniformity among the battery cells is improved.

The fluid in the first flow passage 16 may be a cooling fluid, such as a water-glycol mixture. The fluid within the second flow passage 36 may be a refrigerant, such as R134a, R744, etc. As the refrigerant flows through the second flow passage, the temperature of the refrigerant gradually increases, and since the specific heat of the refrigerant is relatively small, the temperature of the refrigerant increases greatly along the second flow passage, which is located in the heat exchange device, resulting in relatively poor temperature uniformity on the third plate surface 37. After the temperature equalizing device is added, the specific heat of the cooling liquid is relatively large, the cooling liquid is in a flowing state, and the temperature uniformity of the first plate surface 11 of the temperature equalizing device is relatively high. I.e. the temperature equalizing device 1 improves the uniformity of heat transfer between the heat exchanging device 3 and the battery 5.

As shown in fig. 1, the temperature equalizing device 1 and the heat exchanging device 3 are detachably fixed, and when the battery assembly is in a detached state, the second plate surface 19 is separated from the third plate surface 37. The second plate 19 and the third plate 37 may be planar to increase the contact area therebetween. Alternatively, the second plate surface 19 and the third plate surface 37 may have concave-convex shapes, but the second plate surface 19 and the third plate surface 37 need to have substantially complementary shapes to increase the contact area therebetween. The second plate may be made of a material with high heat conductivity, such as metal, silica gel, etc., which is beneficial to heat conduction at the second plate surface 19. The first plate and the second plate can be made of aluminum or aluminum alloy, the aluminum or aluminum alloy has strong heat conduction capacity, the heat exchange is facilitated to be enhanced, and the battery assembly has lighter weight.

In this embodiment, the heat exchange device 3 may be connected to the vehicle body, and the temperature equalizing device 1 may be fixed to the battery 5 to form part of a detachable battery pack (shown by a broken line in fig. 1), which is detachable from the vehicle body, and the advantage of the detachable battery pack is known, for example, the power exchanging operation is performed more quickly. In addition, when the detachable battery pack is charged at the charging station, the battery 5 also heats up. The battery 5 can be cooled by the second plate surface 19 during charging.

As shown in fig. 3 and 4, the second plate 12 includes a sixth plate 122 disposed on the back of the second plate 19, the second plate 12 further includes a first flange 123 and a first rib 124 protruding from the sixth plate 122, and the first plate 13 is fixed to the first flange 123 and the first rib 124 and the connection is sealed. The first flange 123 surrounds at least the first rib 124, one end of the first rib 124 is connected to one side of the first flange 123, and the other end of the first rib 124 is not connected to the other side of the first flange 123, so that a gap through which fluid can flow is formed. The second plate 12 and the first plate 13 define a first flow channel 16 therebetween. The first rib 124 may divide the first flow passage 16 into a U-shape. The third interface 14 and the fourth interface 15 are both disposed on one side of the first rib 124 connected to the first flange 123, and the third interface and the fourth interface are respectively disposed on two sides of the first rib 124. The temperature difference between the inflow end and the outflow end of the first flow channel is the largest, so that heat exchange between the inflow end and the outflow end of the fluid can further improve the temperature uniformity of the first plate surface 11. I.e. to make the temperature uniformity of the temperature equalizing device 1 high. The first plate 13 may be a flat plate, and the heights of the first ribs and the first flanges protruding from the sixth plate 122 may be the same or substantially the same.

In another embodiment of the temperature equalizing device 1, the first plate 13 includes a fifth plate 131 disposed on the back of the first plate 11, the first plate 13 further includes a first flange 123 protruding from the fifth plate 131 and a first rib 124, and the connection portion between the second plate 12 and the first flange 123 and the first rib 124 is sealed.

In other embodiments of the temperature equalizing device, the temperature equalizing device may be provided with a plurality of first ribs, which may partition the second flow path into a serpentine shape. The first flow channel may comprise a plurality of parallel flow channels, one end of each parallel flow channel is communicated with the third interface, and the other end of each parallel flow channel is communicated with the fourth interface. The fluid is distributed more uniformly in the temperature equalizing device, and the temperature of the temperature equalizing device is distributed more uniformly.

As shown in fig. 3 and 4, the third plate 31 includes a seventh plate 312 disposed on the back of the third plate 37, the third plate 31 further includes a second flange 313 and a second rib 314 protruding from the seventh plate 312, and the connection portion between the fourth plate 32 and the second flange 313 and the second rib 314 is sealed. The second flange 313 surrounds at least the second rib 314, one end of the second rib 314 is connected to one side of the second flange 313, the other end of the second rib 314 is disconnected from the other side of the second flange 313, a gap through which fluid can flow is formed, and the third plate 31 and the fourth plate 32 define the second flow channel 36 therebetween. The second ribs 314 may divide the second flow channel 36 into a U-shape. The first interface 34 and the second interface 35 are disposed on one side of the second rib 314 connected to the second flange 313, and the first interface and the second interface are disposed on two sides of the second rib 314 respectively. As shown in fig. 3 and 4, the first rib 124 and the second rib 314 extend in the same or substantially the same direction, and the third port, the fourth port, the first port, and the second port are all disposed on the same side of the battery assembly. The flow directions of the fluid in the first flow channel and the second flow channel are opposite, namely, the first flow channel and the second flow channel are arranged in a countercurrent way, so that the heat exchange effect between the first flow channel and the second flow channel is relatively good, namely, the heat exchange effect between the temperature equalizing device 1 and the heat exchange device 3 is improved. The dots and interdigitated pattern shown in fig. 4 refer to the flow direction of the fluid, the interdigitated fingers penetrating into the page and the dots penetrating out of the page.

As shown in fig. 11, in one embodiment of the battery cooling system, the battery cooling system includes a cooling circulation system including the heat exchange device 3 and the battery 5, and the battery cooling system further includes a soaking circulation system, the soaking circulation system and the cooling circulation system being independent of each other. The term "independent" means that the internal flow channels are independent and not connected. The temperature equalization circulating system comprises a temperature equalization device 1 and a first pump 105, wherein an inlet of the temperature equalization device 1 is connected with an outlet of the first pump 105, an inlet of the first pump 105 is connected with an outlet of the temperature equalization device 1, one side of the temperature equalization device 1 is in direct or indirect contact with a battery 5, the other side of the temperature equalization device 1 is in direct or indirect contact with a heat exchange device 3, and when the temperature equalization device is in operation, the heat exchange device 3 exchanges heat with the temperature equalization device 1, and the temperature equalization device exchanges heat with the battery 5. The first pump can drive the temperature equalizing circulation system, at this time, the fluid in the temperature equalizing device 1 is in a flowing state, and in the flowing process, the cold and hot parts of the fluid in the temperature equalizing device 1 can be mixed, so that the temperature uniformity of the temperature equalizing device 1 is relatively good. In addition, in the first pump 105, mixing of cold and hot portions of the fluid may also occur. The fluid within the soaking cycle system may be a liquid, such as a water-glycol mixture. In the case of a homogeneous circuit, no change in the phase of the fluid is specified, but is possible in principle.

The cooling circulation system further comprises a compressor 106, a condenser 107, an evaporator 109, a second throttling device 103 and a first throttling device 102, wherein the outlet of the compressor is connected with the inlet of the condenser, the inlets of the second throttling device 103 and the first throttling device 102 are respectively connected with the outlet of the condenser, the outlet of the second throttling device 103 is connected with the inlet of the evaporator, the outlet of the evaporator 109 is connected with the inlet of the compressor, the outlet of the first throttling device is connected with the inlet of the heat exchange device, and the outlet of the heat exchange device is connected with the inlet of the compressor. At this time, the fluid in the cooling circulation system is a refrigerant, for example, R134a, R744, or the like. The refrigerant absorbs heat when passing through the heat exchange means, i.e. indirectly cools the battery 5. It should be noted that the "connection" may be a direct connection or an indirect connection, that is, other components may be disposed between two connected components, for example, a filter, a liquid reservoir, a gas-liquid separator, a solenoid valve, and the like. The evaporator 109 may exchange heat with the cabin 118 to regulate the temperature of the cabin 118.

In this embodiment, the first interface 34 of the heat exchange device 3 is communicated with the outlet of the external first throttling device 102, the second interface 35 is communicated with the inlet of the external compressor 106, the outlet of the external condenser 107 is connected with the inlet of the external first throttling device 102, and the inlet of the external condenser is connected with the outlet of the external compressor 106. The fluid flowing into the heat exchange device can circulate between the heat exchange device and the external compressor, the first throttling device and the condenser.

The detached battery pack may be charged in a battery charging station. Since the battery generates heat when charged, the battery also needs to be cooled when charged at a charging station. In another embodiment of the battery cooling system, as shown in fig. 12, the soaking cycle system includes at least two soaking devices 1. The third port of each temperature equalizing device 1 is connected to the outlet of the first pump 105, and the inlet of the first pump 105 is connected to the fourth port of each temperature equalizing device. The number of the heat exchange devices 3 can be at least two, the cooling circulation system further comprises a compressor, a condenser and at least two first throttling devices 102, the outlet of the compressor is connected with the inlet of the condenser, the inlet of each first throttling device 102 is connected with the outlet of the condenser, the outlet of each first throttling device 102 is connected with the inlet of the corresponding heat exchange device 3, and the outlet of each heat exchange device is connected with the inlet of the compressor. The battery cooling system can cool a plurality of batteries 5 at the same time. It should be noted that the "connection" may be a direct connection or an indirect connection, that is, other components may be disposed between two connected components, for example, a filter, a liquid reservoir, a gas-liquid separator, a solenoid valve, and the like.

In another embodiment of the battery assembly, the temperature equalizing device includes a first plate and a second plate. The first plate and the second plate are fixed and the joint is sealed, a first runner is formed in the temperature equalizing device, the temperature equalizing device is not provided with a third interface and a fourth interface, namely, two ends of the first runner are arranged in a closed mode. The liquid is sealed in the first flow channel, the specific heat of the liquid is relatively large, the third plate of the heat exchange device does not influence the first plate surface of the temperature equalization device immediately, namely, the temperature change of the first plate surface of the temperature equalization device is delayed from the heat exchange device, and the temperature uniformity of the temperature equalization device can be improved.

As shown in fig. 5 to 7, in still another embodiment of the battery assembly, the temperature equalizing device 1 further includes at least two protruding portions 17 protruding from the second plate surface, the protruding portions 17 are columnar, and the extending direction of the protruding portions 17 is perpendicular or substantially perpendicular to the second plate surface. The boss 17 includes a circumferential wall 171, the boss 17 being secured to the second plate 12. The heat exchange device further comprises at least two first holes 30, the first holes 30 comprising an inner wall portion 301 extending in the extension direction of the protrusions. The joint of the convex part and the second plate surface is kept at a certain distance from the projection of the first runner on the second plate surface.

In other embodiments of the tab 17, the tab 17 may be fixed with the first plate. Alternatively, the protruding portion 17 may be formed integrally with the temperature equalizing device.

As shown in fig. 6 and 7, the first hole 30 is provided opposite to the convex portion 17, at least a part of the convex portion 17 is inserted into the first hole 30 in the first position, and at least a part of the circumferential wall portion 171 of the convex portion 17 is clearance-fitted with the inner wall portion 301 in the first hole. The battery pack is positioned in the direction parallel to the second plate surface 19, namely, the temperature equalizing device and the heat exchanging device are limited in the direction parallel to the second plate surface 19. Due to the at least two protrusions 17 and the at least two first holes 30, no relative rotation between the temperature equalizing device and the heat exchanging device is possible.

In still another embodiment of the battery assembly, as shown in fig. 8, the battery assembly further includes a heat conducting pad 6, the heat conducting pad 6 is disposed between the second plate 19 and the third plate 37, and the heat conducting pad 6 may be made of elastic material, such as silica gel, so that the heat conducting area between the second plate 19 and the third plate 37 is increased, and the heat exchanging capability is enhanced.

In yet another embodiment of the battery assembly, as shown in fig. 9, the second fins 38 are heat dissipating fins and the fluid medium passing through the second fins 38 is air. Air may be delivered by, for example, fans and air ducts, and air may come from outside the vehicle.

In yet another embodiment of the battery assembly, as shown in fig. 10, the battery assembly may include an elastic element 7, and the elastic element 7 may increase the pressure between the second plate 19 and the third plate 37 so that the second plate 19 and the third plate 37 are closely attached. The fourth plate comprises a fourth plate surface 39. When the battery pack is mounted on the vehicle body, one end of the elastic element 7 is abutted against the fourth plate surface, the elastic element 7 is in a compressed state, the other end of the elastic element 7 is abutted against other parts of the vehicle body, and the elastic element 7 can apply force to the fourth plate towards the second plate. The elastic element 7 may be a spring.

It should be noted that: the above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, for example, the directions of "front", "rear", "left", "right", "up", "down", etc., and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention may be combined, modified or substituted with each other, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present invention are intended to be included in the scope of the claims of the present invention.

Claims

1. A battery assembly comprising a battery (5), characterized in that the battery assembly comprises a temperature equalizing device (1), the temperature equalizing device (1) comprises a first plate (13) and a second plate (12), the first plate (13) and the second plate (12) are fixed and the joint is sealed, a first flow channel (16) is formed in the temperature equalizing device (1), the first plate (13) is provided with a first plate surface (11), the second plate (12) is provided with a second plate surface (19), and the first plate surface (11) is directly or indirectly contacted with the battery (5);

the battery assembly further comprises a heat exchange device (3), the temperature equalization device is arranged between the heat exchange device and the battery, the heat exchange device (3) comprises a third plate (31) and a fourth plate (32), the joint of the third plate and the fourth plate is fixed and sealed, and a second flow channel (36) is formed in the heat exchange device (3); the heat exchange device (3) further comprises a first interface (34) and a second interface (35), the first interface (34) is communicated with one end of the second flow channel (36), the second interface is communicated with the other end of the second flow channel (36), the third plate (31) is provided with a third plate surface (37) corresponding to the second plate surface (19), the temperature equalizing device is fixed with a battery, and the temperature equalizing device (1) is detachably fixed with the heat exchange device (3);

when the battery assembly is in an installation state, the third plate surface (37) is in direct or indirect contact with the second plate surface (19), so that the heat exchange device can exchange heat with the battery through the temperature equalizing device; when the battery assembly is in a disassembled state, the second plate surface is separated from the third plate surface;

when the battery assembly works, the specific heat of the fluid located in the first flow channel is larger than that of the fluid located in the second flow channel.

2. The battery assembly according to claim 1, wherein the temperature equalizing device (1) further comprises a third interface (14) and a fourth interface (15), the third interface is communicated with one end of the first flow channel (16), the fourth interface is communicated with the other end of the first flow channel (16), the third interface is communicated with an inlet of an external water pump, the fourth interface is communicated with an outlet of the external water pump, and fluid flowing into the temperature equalizing device can circulate between the temperature equalizing device and the external water pump.

3. The battery assembly according to claim 1 or 2, wherein the battery (5) comprises a plurality of battery cells (51, 52, 53), the first plate surface (11) is in direct or indirect contact with each of the battery cells, each of the battery cells (51, 52, 53) corresponds to the first flow channel (16), the second flow channel (36) is provided corresponding to the first flow channel (16), the first flow channel (16) extends in a direction parallel or substantially parallel to the first plate surface (11), and the second flow channel (36) extends in a direction parallel or substantially parallel to the first plate surface (11).

4. The battery assembly according to claim 2, wherein the second plate (12) comprises a sixth plate (122) arranged on the back of the second plate (19), the second plate (12) further comprises a first flange (123) protruding from the sixth plate (122) and a first rib (124), the first plate (13) being fixed to the first flange (123) and the first rib (124) and the connection being sealed;

or, the first plate (13) comprises a fifth plate surface (131) arranged on the back surface of the first plate surface (11), the first plate (13) further comprises a first flange (123) and a first rib (124) protruding from the fifth plate surface (131), and the joint between the second plate (12) and the first flange (123) and the first rib (124) is sealed;

-said first flange (123) surrounding at least said first rib (124), one end of said first rib (124) being connected to one side of said first flange (123), the other end of said first rib (124) being unconnected to the other side of said first flange (123), said second plate (12) defining said first flow channel (16) with said first plate (13);

the third interface (14) and the fourth interface (15) are close to one side of the first rib (124) connected with the first flange (123), and the third interface and the fourth interface are respectively arranged on two sides of the first rib (124).

5. The battery assembly according to any one of claims 1, 2, 4, wherein,

the third plate (31) comprises a seventh plate surface (312) arranged on the back surface of the third plate surface (37), the third plate (31) further comprises a second flange (313) and a second rib (314) which are protruded from the seventh plate surface (312), and the joint between the fourth plate (32) and the second flange (313) as well as the second rib (314) is sealed;

or, the fourth plate comprises a fourth plate surface (39), the fourth plate (32) comprises an eighth plate surface (323) arranged on the back surface of the fourth plate surface (39), the fourth plate (32) further comprises a second flange (313) and a second rib (314) protruding from the eighth plate surface (323), and the joint of the third plate, the second flange and the second rib is fixed and sealed;

-said second flange (313) surrounding at least said second rib (314), one end of said second rib (314) being connected to one side of said second flange (313), the other end of said second rib (314) being unconnected to the other side of said second flange (313), said third plate (31) and said fourth plate (32) defining said second flow channel (36) therebetween;

the first interface (34) and the second interface (35) are close to one side of the second rib (314) connected with the second flange (313), and the first interface and the second interface are respectively arranged on two sides of the second rib (314).

6. The battery assembly according to any one of claims 1, 2, 4, characterized in that the temperature equalizing device (1) further comprises at least two protrusions (17) protruding from the second plate surface (19), the protrusions (17) comprising circumferential wall portions (171), the protrusions (17) being fixed or integral with the first plate and/or the second plate and the protrusions (17) extending in a direction perpendicular or substantially perpendicular to the second plate surface, the connection of the protrusions to the second plate surface being kept at a distance from the projection of the first flow channel on the second plate surface;

the heat exchange device (3) further comprises at least two first holes (30), the first holes (30) comprising an inner wall portion (301) extending in the extension direction of the protruding portion (17);

the first hole is provided opposite to the protruding portion, at least a part of the protruding portion (17) is inserted into the first hole (30), and at least a part of a circumferential wall portion (171) of the protruding portion (17) is clearance-fitted with an inner wall portion (301) of the first hole.

7. The battery assembly according to claim 1, characterized in that it comprises an elastic element (7), the fourth plate comprising a fourth plate face (39); one end of the elastic element (7) is abutted against the fourth plate surface (39), the elastic element is in a compressed state, and the elastic force of the elastic element faces the temperature equalizing device (1).

8. The battery assembly of claim 1, further comprising a first fin (18) and a second fin (38), the first fin (18) being disposed in the first flow channel and the second fin (38) being disposed in the second flow channel;

a heat conducting pad is arranged between the battery and the temperature equalizing device, and a heat conducting pad (6) is arranged between the temperature equalizing device and the heat exchanging device.

9. The battery assembly of claim 1, wherein the first interface of the heat exchange device communicates with an outlet of an external first throttling device, the second interface communicates with an inlet of the external compressor, an outlet of an external condenser is connected with an inlet of the external first throttling device, and an inlet of the external condenser is connected with an outlet of the external compressor;

the fluid flowing into the heat exchange device can circularly flow between the heat exchange device and the external compressor, the first throttling device and the condenser.

10. The battery assembly according to claim 4, wherein the first plate (13) is a flat plate, and the first ribs and the first flange protrusions may have the same or substantially the same height from the sixth plate surface (122);

the first flow channel comprises a plurality of parallel flow channels, one end of each parallel flow channel is communicated with the third interface, and the other end of each parallel flow channel is communicated with the fourth interface.

11. The battery assembly of claim 3, wherein the battery assembly comprises a plurality of battery cells,

12. A battery pack according to claim 3, wherein the temperature equalizing device (1) further comprises at least two protrusions (17) protruding from the second plate surface (19), the protrusions (17) comprising circumferential wall portions (171), the protrusions (17) being fixed or integrally structured with the first plate and/or the second plate, and the extending direction of the protrusions (17) being perpendicular or substantially perpendicular to the second plate surface, the connection of the protrusions to the second plate surface being kept at a distance from the projection of the first flow channel on the second plate surface;