Heat dissipation structure, battery module, heat dissipation system and control method of heat dissipation system

Abstract

The present invention provides a heat dissipation structure, a battery module, a heat dissipation system, and a control method for the heat dissipation system. Among them, the heat dissipation structure includes: a liquid cooling pipe, which is located on the side of the connection row of the battery module away from the battery cell assembly, and the extending direction of the liquid cooling pipe is parallel to the extending direction of the connection row, so as to dissipate heat from the battery module by introducing flowing coolant into the liquid cooling pipe; an insulating member, which is strip-shaped, and the extending direction of the insulating member is parallel to the extending direction of the liquid cooling pipe. The insulating member is located between the liquid cooling pipe and the connection row to insulate between the liquid cooling pipe and the connection row, and the insulating member is in contact with both the liquid cooling pipe and the connection row to transfer the heat of the connection row to the liquid cooling pipe. The heat dissipation structure provided by the present invention solves the problem of poor heat dissipation effect at the connection row of the battery module in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of heat conduction, and more particularly, to a heat dissipation structure, a battery module, a heat dissipation system, and a control method for the heat dissipation system. Background Art

[0002] A battery module is an assembly capable of providing electrical energy and is one of the secondary structures constituting a battery system. Existing battery modules include battery cells, a metal frame, and busbars, and do not integrate a heat dissipation module. Its heat dissipation function is achieved by installing a liquid cooling plate at the bottom of the battery box. The installed liquid cooling plate needs to bear the weight of all battery modules. Therefore, the liquid cooling plate not only contains a large amount of liquid medium but also requires a certain strength, so the currently used liquid cooling plate accounts for a relatively large proportion of the box.

[0003] The pole of a lithium-ion battery is connected to the metal foil of the internal winding core of the battery cell. Obviously, the thermal resistance from the winding core to the connection row is much smaller than the thermal resistance from the winding core to the outer shell of the battery cell.

[0004] However, most of the current heat dissipation forms of battery modules only target the bottom or side of the battery cells, and there are few heat dissipations for the connection rows. In addition to the fact that the connection rows are charged and it is difficult to solve the insulation and safety problems, the complex shape of the connection rows is also an important reason. Summary of the Invention

[0005] The main object of the present invention is to provide a heat dissipation structure, a battery module, a heat dissipation system, and a control method for the heat dissipation system to solve the problem of poor heat dissipation effect at the connection row of the battery module in the prior art.

[0006] To achieve the above object, according to one aspect of the present invention, a heat dissipation structure is provided, including: a liquid cooling tube located on the side of the connection row of the battery module away from the battery cell assembly, the extending direction of the liquid cooling tube being parallel to the extending direction of the connection row to dissipate heat from the battery module by passing flowing coolant into the liquid cooling tube; an insulating member being strip-shaped, the extending direction of the insulating member being parallel to the extending direction of the liquid cooling tube, the insulating member being located between the liquid cooling tube and the connection row to insulate between the liquid cooling tube and the connection row, and the insulating member being in contact with both the liquid cooling tube and the connection row to transfer the heat of the connection row to the liquid cooling tube.

[0007] Further, the heat dissipation structure further includes: a fixing member, the extending direction of the fixing member being parallel to the extending direction of the liquid cooling tube, the fixing member having a mounting groove and an opening part communicating with the mounting groove; wherein, the fixing member is made of an insulating material, the insulating member is arranged on the side of the fixing member close to the opening part to enclose a mounting space through the insulating member and the fixing member, the liquid cooling tube is located in the mounting space, and the fixing member is detachably mounted on the battery module to fix the liquid cooling tube and the insulating member on the battery module.

[0008] Further, the fixing member further includes: two side portions, the extending directions of the two side portions are both parallel to the extending direction of the connection row, and the two side portions are arranged at intervals relative to each other; a connecting portion, the extending direction of the connecting portion is parallel to the extending direction of the connection row, and both sides of the connecting portion are respectively connected to the two side portions to form an installation groove through the connecting portion and the two side portions; an opening portion is located on one side of the two side portions away from the connecting portion; wherein, both sides of the two side portions away from the connecting portion have mounting surfaces, and both mounting surfaces are in contact with the insulating member to form an installation space through the insulating member and the fixing member.

[0009] Further, each side portion includes: two mounting portions, the two mounting portions are respectively arranged at both ends of the corresponding side portion in the extending direction, and the two mounting portions are respectively used for connecting to the two end plates of the battery module.

[0010] Further, the fixing member further includes: an avoidance groove, the avoidance groove is located on one side of the fixing member, and the output end of the connection row extends out of the fixing member through the avoidance groove.

[0011] Further, the insulating member is a ceramic sheet, and the insulating member is pasted on one side of the fixing member close to the connection row to form an installation space through the insulating member and the fixing member.

[0012] Further, the liquid cooling pipe includes: a main cooling section, the extending direction of the main cooling section is parallel to the extending direction of the connection row; two bending sections, the two bending sections are respectively arranged at both ends of the main cooling section, and the extending directions of the two bending sections are opposite to each other so that the liquid cooling pipe forms a Z-shaped structure, and the outlet and the inlet of the liquid cooling pipe are respectively located at the free ends of the two bending sections.

[0013] Further, the outer peripheral surface of the liquid cooling pipe includes two relatively arranged flat surfaces and two partial arc surfaces connected to the two flat surfaces, and one of the flat surfaces is attached to the surface of the insulating member away from the connection row.

[0014] According to the second aspect of the present invention, there is provided a battery module, including a battery cell assembly formed by stacking a plurality of battery cells, and a plurality of connection rows connected to the positive or negative electrodes of each battery cell. The battery module further includes: a plurality of heat dissipation structures, the heat dissipation structures are the above-mentioned heat dissipation structures, the plurality of heat dissipation structures are located on one side of the corresponding connection row away from the battery cell assembly, and the insulating members of the heat dissipation structures are in contact with the connection rows, and the liquid cooling pipes in the plurality of heat dissipation structures are connected in series with each other to form a liquid cooling pipe group.

[0015] Further, the plurality of connection rows are divided into two groups, the two groups of connection rows are arranged at intervals, and one heat dissipation structure is correspondingly arranged at each group of connection rows; the liquid cooling pipes of the two heat dissipation structures corresponding to the two groups of connection rows are connected and communicated with each other.

[0016] Further, the battery module further includes a first connecting pipe, which is arranged between the liquid cooling pipes of two sets of heat dissipation structures, so that one liquid cooling pipe is communicated with the other liquid cooling pipe.

[0017] Further, the battery module includes end plates arranged at both ends in the length direction of the battery cell assembly, and both ends of each heat dissipation structure are respectively connected to the corresponding end plates through fasteners, so as to fix each heat dissipation structure relative to the corresponding connection row.

[0018] Further, the battery module includes a pressing plate, the extending direction of the pressing plate is parallel to the length direction of the battery cell assembly, the pressing plate is arranged on one side of the battery cell assembly close to the connection row, the pressing plate is located in the middle of the width direction of the battery cell assembly, and both ends in the length direction of the pressing plate are respectively connected to the two end plates to clamp the end plates.

[0019] Further, each end plate includes: two first connection parts, the two first connection parts are respectively arranged corresponding to the two heat dissipation structures, and the two heat dissipation structures and the corresponding first connection parts are connected through first fasteners; a second connection part, the second connection part is located between the two first connection parts, the second connection part is arranged corresponding to the pressing plate, and the pressing plate and the second connection part are connected through second fasteners.

[0020] Further, each end plate includes: two third connection parts which are parallel and spaced apart from each other, the two third connection parts are arranged on the side of the end plate far from the battery cell assembly, and the two third connection parts are located at one end of the end plate far from the heat dissipation structure, so that the battery module is fixed on the corresponding battery box body through the third connection parts.

[0021] Further, the battery module further includes: two side plates, the two side plates are located on both sides in the width direction of the battery module, and the two side plates are welded to the two end plates.

[0022] Further, each of the two side plates includes: a first plate body part, the first plate body part is parallel to the length direction of the battery module; two second plate body parts, the two second plate body parts are oppositely arranged at both ends of the first plate body part, the two second plate body parts are parallel to the end plates, and the two second plate body parts are respectively used for welding with the corresponding end plates.

[0023] Further, each of the two end plates includes: two welding grooves, the two welding grooves are respectively located at both ends of the end plate along the width direction of the battery module, and the two welding grooves are respectively arranged corresponding to the second plate body parts of the two side plates for welding with the corresponding second plate body parts.

[0024] Further, the battery module further includes a plurality of heat dissipation structures arranged on both sides in the width direction of the battery module, and the liquid cooling pipes of each heat dissipation structure in the battery module are connected in series with each other to form a liquid cooling pipe group.

[0025] According to a third aspect of the present invention, a heat dissipation system is provided, comprising: a refrigeration device for refrigerating a coolant; a liquid cooling device including a battery box having at least one battery module, and the battery module is the above-mentioned battery module; wherein, the liquid cooling pipe groups of each battery module are connected in series to form a liquid cooling pipeline of the corresponding battery box, and the battery box is cooled by introducing the coolant into the liquid cooling pipeline.

[0026] According to a fourth aspect of the present invention, a control method for a heat dissipation system is provided. The control method for the heat dissipation system is used to control the above-mentioned heat dissipation system, and the control method for the heat dissipation system includes: collecting temperature signals in a plurality of battery boxes of the heat dissipation system; when the highest temperature T among the collected plurality of temperature signals is greater than a first preset temperature T1, introducing the coolant into the liquid cooling pipeline of the battery box and making the refrigeration device of the heat dissipation system in a non-working state; when the highest temperature T among the collected plurality of temperature signals is greater than a second preset temperature T2, turning on the refrigeration function of the refrigeration device to refrigerate the coolant; when the highest temperature T among the collected plurality of temperature signals is less than a third preset temperature T3, turning off the refrigeration function of the refrigeration device; wherein, the second preset temperature T2 is greater than the third preset temperature T3, and the third preset temperature T3 is greater than the first preset temperature T1.

[0027] Applying the technical solution of the present invention, the heat dissipation structure provided by the present invention includes a liquid cooling pipe on a side of a connection row of the battery module away from the battery cell assembly, and an insulating member disposed between the liquid cooling pipe and the connection row. The insulating member is in contact with the liquid cooling pipe and the connection row respectively to transfer the heat of the connection row to the liquid cooling pipe while ensuring the insulation between the liquid cooling pipe and the connection row. The heat dissipation structure of the present invention is specifically for dissipating heat from the connection row. Under the condition of ensuring the insulation of the connection row, heat dissipation at the connection row is achieved, and the technical effect of improving the heat dissipation efficiency of the battery module is achieved. The problem of poor heat dissipation at the connection row of the battery module in the prior art is solved. The problem that the thermal resistance of heat transfer from the wound core inside the battery cell to the connection row is much smaller than that of heat transfer to the outer shell of the battery cell, so the heat at the connection row is large and the temperature is high is solved. At the same time, since the connection row is located above the battery module, that is, the upper part of the battery box, the heat dissipation structure of the present invention solves the problem that in the prior art, the liquid cooling plate is installed at the bottom of the battery box, which not only needs to have a heat dissipation function but also needs to support the weight of the battery module, so the proportion of the battery box occupied by the liquid cooling plate is relatively large. Description of the Drawings

[0028] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0029] Figure 1 The structural schematic diagram of a heat dissipation structure according to an embodiment of the present invention is shown;

[0030] Figure 2 is shown Figure 1 the exploded view of the heat dissipation structure shown;

[0031] Figure 3 The structural schematic diagram of a battery module according to an embodiment of the present invention is shown;

[0032] Figure 4 is shown Figure 3 the exploded view of the battery module shown;

[0033] Figure 5 is shown Figure 3 the structural schematic diagram of the end plate of the battery module shown;

[0034] Figure 6 shows a plurality of Figure 3 the assembly schematic diagram of the battery modules shown;

[0035] Figure 7 is shown Figure 6 the connection schematic diagram of the plurality of liquid cooling tubes shown; and

[0036] Figure 8 The structural schematic diagram of a heat dissipation system according to an embodiment of the present invention is shown.

[0037] Wherein, the above-mentioned drawings include the following reference numerals:

[0038] 1. Liquid cooling tube; 2. Insulating part; 3. Fixing part; 31. Connecting part; 32. Side part; 320. Mounting part; 33. Avoidance groove; 34. Mounting groove; 10. Heat dissipation structure; 20. Battery module; 21. Battery cell assembly; 210. Battery cell; 22. Connection row; 23. End plate; 231. First connection part; 232. Second connection part; 233. Third connection part; 234. Welding groove; 235. Reinforcing rib; 236. Weight reduction groove; 24. Side plate; 25. Pressing plate; 26. First connecting pipe; 27. Second connecting pipe; 28. Third connecting pipe; 30. Battery box; 300. Battery management system; 310. Liquid cooling pipeline; 40. Heat dissipation system; 41. Liquid supply device; 42. Driving pump; 43. Heat exchanger; 431. Temperature detection component; 44. Compressor; 45. Expansion valve; 46. Condenser; 47. Controller; 48. Flow valve. Detailed implementation manners

[0039] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0040] As Figure 1 and Figure 7 shown, the present invention provides a heat dissipation structure, including: a liquid cooling pipe 1, the liquid cooling pipe 1 is located on a side of a connection row 22 of a battery module away from a cell assembly 21, and an extending direction of the liquid cooling pipe 1 is parallel to an extending direction of the connection row 22, so as to dissipate heat from the battery module by introducing flowing cooling liquid into the liquid cooling pipe 1; an insulating member 2, the insulating member 2 is strip-shaped, an extending direction of the insulating member 2 is parallel to the extending direction of the liquid cooling pipe 1, the insulating member 2 is located between the liquid cooling pipe 1 and the connection row 22, so as to insulate between the liquid cooling pipe 1 and the connection row 22, and the insulating member 2 is in contact with both the liquid cooling pipe 1 and the connection row 22, so as to transfer heat of the connection row 22 to the liquid cooling pipe 1.

[0041] The heat dissipation structure provided by the present invention includes a liquid cooling pipe 1 located on a side of a connection row 22 of a battery module away from a cell assembly 21, and an insulating member 2 disposed between the liquid cooling pipe 1 and the connection row 22. Among them, the insulating member 2 is in contact with the liquid cooling pipe 1 and the connection row 22 respectively, so as to transfer heat of the connection row 22 to the liquid cooling pipe 1 while ensuring insulation between the liquid cooling pipe 1 and the connection row 22. The heat dissipation structure of the present invention is specifically for dissipating heat from the connection row. Under the condition of ensuring insulation of the connection row 22, heat dissipation at the connection row 22 is achieved, and the technical effect of improving the heat dissipation efficiency of the battery module is achieved. The problem that the heat dissipation effect at the connection row of the battery module in the prior art is poor is solved. The problem that the thermal resistance of heat transfer from the wound core inside the cell to the connection row 22 is much smaller than the thermal resistance of heat transfer to the cell housing, so the heat at the connection row 22 is large and the temperature is high is solved. At the same time, since the connection row 22 is located above the battery module, that is, at the upper part of the battery box, the heat dissipation structure of the present invention solves the problem that in the prior art, the liquid cooling plate is installed at the bottom of the battery box, and it not only needs to have a heat dissipation function, but also needs to have a function of supporting the weight of the battery module. Therefore, the proportion of the battery box occupied by the liquid cooling plate is relatively large.

[0042] Preferably, the heat dissipation structure further includes: a fixing member 3, an extending direction of the fixing member 3 is parallel to the extending direction of the liquid cooling pipe 1, the fixing member 3 has an installation groove 34 and an opening part communicating with the installation groove 34; among them, the fixing member 3 is made of an insulating material, the insulating member 2 is disposed on a side of the fixing member 3 close to the opening part, so as to enclose an installation space through the insulating member 2 and the fixing member 3, the liquid cooling pipe 1 is located in the installation space, and the fixing member 3 is detachably installed on the battery module, so as to fix the liquid cooling pipe 1 and the insulating member 2 on the battery module.

[0043] Specifically, there is an interference fit between the installation groove 34 of the fixing member 3 and the liquid cooling pipe 1 to fix the liquid cooling pipe 1 in the installation groove 34. Additionally, the fixing member 3 is made of plastic, with reinforcing ribs provided on the fixing member 3, and weight-reducing holes are machined on the non-main load-bearing parts of the fixing member 3 to reduce the material used for the fixing member 3 while ensuring its load-bearing capacity, reduce the processing cost, and reduce the weight of the fixing member 3.

[0044] As Figure 1 and Figure 2 shown, the fixing member 3 further includes: two side parts 32, the extending directions of the two side parts 32 are both parallel to the extending direction of the connection row 22, and the two side parts 32 are arranged relatively spaced apart; a connecting part 31, the extending direction of the connecting part 31 is parallel to the extending direction of the connection row 22, and both sides of the connecting part 31 are respectively connected to the two side parts 32 to enclose the installation groove 34 through the connecting part 31 and the two side parts 32; the opening part is located on the side of the two side parts 32 away from the connecting part 31; wherein, both sides of the two side parts 32 away from the connecting part 31 have installation surfaces, and both installation surfaces are in contact with the insulating member 2 to enclose an installation space through the insulating member 2 and the fixing member 3. In this way, the liquid cooling pipe 1 is located in the installation space enclosed by the insulating member 2 and the fixing member 3.

[0045] As Figure 1 shown, each side part 32 includes: two installation parts 320, the two installation parts 320 are respectively arranged at both ends of the corresponding side part 32 in its extending direction, and the two installation parts 320 are respectively used for connecting to the two end plates 23 of the battery module.

[0046] Specifically, one fixing member 3 has two side parts 32, and both ends of each side part 32 include installation parts 320, so one fixing member 3 has four installation parts 320.

[0047] As Figure 1 shown, the fixing member 3 further includes: an avoidance groove 33, the avoidance groove 33 is located on one side of the fixing member 3, and the output end of the connection row 22 extends out of the fixing member 3 through the avoidance groove 33.

[0048] As Figure 3 shown, the avoidance groove 33 is the outlet of the connection row 22. When the heat dissipation structure is arranged at the connection row 22 with a positive output end, the avoidance groove 33 is correspondingly arranged with the output end of the positive connection row 22 so that the positive output end can extend out of the fixing member 3 to be used as the positive electrode of the battery module to connect with other devices; when the heat dissipation structure is arranged at the connection row 22 with a negative output end, the avoidance groove 33 is correspondingly arranged with the negative output end of the connection row 22 so that the negative output end can extend out of the fixing member 3 to be used as the negative electrode of the battery module to connect with other devices.

[0049] In addition, other openings can be reasonably arranged in the heat dissipation structure according to various signal acquisition requirements of the battery module.

[0050] As Figure 2 shown, the insulating part 2 is a ceramic sheet, and the insulating part 2 is pasted on one side of the fixing part 3 close to the connection row 22 to form an installation space by the insulating part 2 and the fixing part 3. The insulating part 2 is made of ceramic material, and the ceramic material has good insulation and heat conductivity, which can not only play an insulating role between the liquid cooling pipe 1 and the connection row 22, but also timely transfer the heat at the connection row 22 to the liquid cooling pipe 1 evenly, improving the heat dissipation efficiency of the heat dissipation structure.

[0051] Specifically, the liquid cooling pipe 1 includes: a main cooling section, the extending direction of the main cooling section is parallel to the extending direction of the connection row 22; two bending sections, the two bending sections are respectively arranged at both ends of the main cooling section, and the extending directions of the two bending sections are opposite to each other, so that the liquid cooling pipe 1 forms a Z-shaped structure, and the outlet and inlet of the liquid cooling pipe 1 are respectively located at the free ends of the two bending sections.

[0052] Preferably, the outer peripheral surface of the liquid cooling pipe 1 includes two relatively arranged planes and two partial arc surfaces connected to the two planes, and one of the planes is attached to the surface of the insulating part 2 far from the connection row 22.

[0053] Specifically, the main cooling section of the liquid cooling pipe 1 is pressed into a flat pipe with two parallel upper and lower planes to increase the contact area between the liquid cooling pipe 1 and the insulating part 2 and improve the heat conduction efficiency. The cross sections of the two bending sections are standard circles, which is convenient for the installation and sealing between the liquid cooling pipe 1 and other pipes and reduces the flow resistance of the coolant at this place.

[0054] The heat dissipation structure of the present invention is composed of a liquid cooling pipe 1, an insulating part 2, a fixing part 3 and screws. An installation groove 34 for the liquid cooling pipe 1 is arranged on the fixing part 3. The liquid cooling pipe 1 is processed with a plane corresponding to the plane of the insulating part 2. The insulating part 2 is adhesively bonded to the bottom of the fixing part 3 by glue. The liquid cooling pipe 1 is fixed between the insulating part 2 and the fixing part 3. At the same time, the plane of the liquid cooling pipe 1 is attached to the plane of the insulating part 2. Then the whole heat dissipation structure is installed at the corresponding position of the battery module and locked and fixed with screws.

[0055] As Figures 3 to 4, the present invention provides a battery module, which includes a battery cell assembly 21 formed by stacking a plurality of battery cells 210, and a plurality of connection bars 22 connected to the positive or negative electrodes of each battery cell 210. The battery module further includes: a plurality of heat dissipation structures 10, the heat dissipation structures 10 being the above-mentioned heat dissipation structures. A plurality of heat dissipation structures 10 are located on the side of the corresponding connection bar 22 away from the battery cell assembly 21, and the insulating member 2 of the heat dissipation structure contacts the connection bar 22. The liquid cooling tubes 1 in the plurality of heat dissipation structures 10 are connected in series with each other to form a liquid cooling tube group. In this way, by introducing a coolant into the liquid cooling tube group, heat dissipation at the connection bar 22 of the battery module is achieved.

[0056] As Figure 4 shown, the plurality of connection bars 22 are divided into two groups, the two groups of connection bars 22 are arranged at intervals, and one heat dissipation structure 10 is correspondingly arranged at each connection bar 22; the liquid cooling tubes 1 of the two heat dissipation structures corresponding to the two groups of connection bars 22 are connected and communicated with each other.

[0057] Correspondingly, the surface of the connection bar 22 close to the heat dissipation structure is a plane with a relatively large area, so that the connection bar 22 and the insulating member 2 of the heat dissipation structure 10 can be in large-area contact, ensuring the heat conduction efficiency between the connection bar 22 and the insulating member 2.

[0058] Specifically, the plurality of battery cells 210 are sequentially stacked along the length direction of the battery module. Each battery cell 210 has a positive output terminal and a negative output terminal. The series or parallel connection between the battery cells is realized through the connection bar 22. Therefore, the output terminals in the battery module are arranged in two groups, and the connection bars 22 are also arranged in two groups. The extending directions of the two groups of connection bars 22 are parallel to the length direction of the battery module. Therefore, the two heat dissipation structures 10 correspondingly arranged with the two groups of connection bars 22 are also parallel to the length direction of the battery module.

[0059] As Figure 3 shown, the battery module further includes a first connection pipe 26. The first connection pipe 26 is arranged between the liquid cooling tubes 1 of the two heat dissipation structures to connect one liquid cooling tube 1 and another liquid cooling tube 1. The two ends of the first connection pipe 26 are respectively connected to the liquid cooling tubes 1 of the two heat dissipation structures 10 to connect the liquid cooling tubes 1 of the two heat dissipation structures 10. The first connection pipe 26 is a flexible rubber pipe. The two ends of the first connection pipe 26 are respectively clamped at the openings of the bent sections of the corresponding liquid cooling tubes 1 by wire snap rings to connect the two liquid cooling tubes 1.

[0060] Specifically, the battery module includes end plates 23 arranged at both ends in the length direction of the battery cell assembly 21. The two ends of each heat dissipation structure are respectively connected to the corresponding end plate 23 through fasteners to fix each heat dissipation structure relative to the corresponding connection bar 22.

[0061] The battery module includes a pressing plate 25. The extending direction of the pressing plate 25 is parallel to the length direction of the battery cell assembly 21. The pressing plate 25 is disposed on one side of the battery cell assembly 21 close to the connection row 22. The pressing plate 25 is located in the middle of the width direction of the battery cell assembly 21. The two ends of the pressing plate 25 in the length direction are respectively connected to the two end plates 23 to clamp the end plates 23. In this way, the pressing plate 25 can press the battery module in the height direction of the battery module.

[0062] Preferably, a pressing plate reinforcing rib is convexly provided on the side of the pressing plate 25 away from the battery module to improve the strength of the pressing plate 25.

[0063] As Figure 5 shown, each end plate 23 includes: two first connection portions 231, the two first connection portions 231 are respectively arranged corresponding to the two heat dissipation structures 10, and the two heat dissipation structures 10 and the corresponding first connection portions 231 are connected by first fasteners; a second connection portion 232, the second connection portion 232 is located between the two first connection portions 231, the second connection portion 232 is arranged corresponding to the pressing plate 25, and the pressing plate 25 and the second connection portion 232 are connected by second fasteners.

[0064] Specifically, first threaded holes are provided on both of the two first connection portions 231, and corresponding first through holes are provided on the fixing members 3 of the two heat dissipation structures 10, so as to fixedly connect each heat dissipation structure 10 with the corresponding end plate 23 by passing the first fasteners through the first through holes and tightening them in the first threaded holes.

[0065] Optionally, the pressing plate 25 is a sheet metal part made of aluminum alloy, or the pressing plate 25 is made of other materials. The two ends of the pressing plate 25 in the length direction are bent 90 degrees towards the direction close to the end plate 23 to form pressing plate connection portions for connecting with the end plate 23. Second threaded holes parallel to the length direction of the battery module are provided on the second connection portion 232, and corresponding second through holes are provided on the pressing plate connection portions, so as to fixedly connect the two ends of the pressing plate 25 with the two end plates 23 respectively by passing the second fasteners through the second through holes and tightening them in the second threaded holes, thereby transferring the vibration force generated in the height direction of the battery module to the radial direction of the second threaded holes, and avoiding the situation that the second fasteners become loose due to insufficient thread strength of the second threaded holes.

[0066] Preferably, a chamfer is machined at the edge of the second connection portion 232 of the end plate 23 close to the upper part of the battery module, and the chamfer should be larger than the inner chamfer formed after the bending of the pressing plate connection portion of the pressing plate 25 to ensure that the pressing plate 25 can act on each battery cell 210.

[0067] Specifically, each end plate 23 includes: two third connecting parts 233 that are parallel to each other and spaced apart, and the two third connecting parts 233 are arranged on the side of the end plate 23 away from the battery cell assembly 21. The two third connecting parts 233 are located at one end of the end plate 23 away from the heat dissipation structure 10, so that the battery module is fixed to the corresponding battery box through the third connecting parts 233.

[0068] The function of the third connecting part 233 of the end plate 23 is to fix the battery module on the bottom plate of the battery box. Compared with the prior art solution of passing a long bolt through the entire end plate and connecting it to the battery box, the third connecting part 233 of the present invention greatly reduces the length of the bolts used, reduces the force arm of the bolts, and at the same time reduces the weight of the battery module.

[0069] The battery module further includes: two side plates 24, which are located on both sides in the width direction of the battery module, and the two side plates 24 are welded to the two end plates 23 respectively.

[0070] Specifically, the two side plates each include: a first plate body part that is parallel to the length direction of the battery module; two second plate body parts that are oppositely arranged at both ends of the first plate body part, and the two second plate body parts are parallel to the end plate 23, and the two second plate body parts are respectively used for welding with the corresponding end plate 23.

[0071] The side plate 24 is made of aluminum alloy. The two second plate body parts are bent 90 degrees to the same side at both ends in the length direction of the first plate body part, so as to transfer the stress generated by the expansion of the battery cell 210 in the battery module to the length direction of the side plate 24. To ensure the welding strength, the side plate 24 needs a certain width, which results in strength redundancy of the side plate 24. Therefore, the side plate 24 is punched to reduce the mass of the side plate 24 while ensuring the strength of the side plate 24.

[0072] Since the connection between the end plate 23 and the side plate 24 is a welded connection, the end plate 23 is made of the same material as the side plate 24 or an alloy material with welding performance similar to that of the side plate 24.

[0073] Correspondingly, each of the two end plates 23 includes: two welding grooves 234, which are respectively located at both ends of the end plate 23 along the width direction of the battery module, and the two welding grooves 234 are respectively arranged corresponding to the second plate body parts of the two side plates, so as to be used for welding with the corresponding second plate body parts. At the same time, chamfers with a larger diameter are machined at the edges of the two welding grooves 234 near both ends in the width direction of the battery module to reduce the stress concentration at the bent part of the side plate 24.

[0074] In addition, a plurality of reinforcing ribs 235 and a plurality of weight-reducing grooves 236 are also provided on the end plate 23 to reduce the weight of the battery module while ensuring that the end plate 23 has sufficient strength. The end plate 23 has the same height and width as the square-shell battery cell. If dielectric protection is required for the end plate 23 or the side plate 24, the end plate 23 needs to increase the thickness dimension for installing the protection component.

[0075] The battery module provided by the present invention is a square-shell battery module. Among them, foam is pasted on both sides of the battery cell assembly 21 along the length direction of the battery module, and the battery cell assembly 21 is clamped between two end plates 23. Foam is also pasted between the end plate 23 and the battery cell assembly 21. The two end plates 23 are squeezed by equipment or other external forces so that a predetermined distance is reached between the two end plates 23. Then, the two side plates 24 are welded to the welding grooves 234 of the end plate 23, and the pressing plate 25 is installed at the corresponding position of the battery module and locked and fixed with screws.

[0076] In addition, the battery module further includes a plurality of heat dissipation structures provided on both sides in the width direction of the battery module. The liquid cooling pipes 1 of each heat dissipation structure in the battery module are connected in series with each other to form a liquid cooling pipe group.

[0077] When the battery module of the present invention works under the condition of continuous high-rate charge and discharge, not only a heat dissipation structure 10 needs to be provided on the side of the connection row 22 away from the battery cell assembly 21, but also more heat dissipation structures 10 need to be added on both sides in the width direction of the battery module to dissipate heat from multiple parts of the battery module. In addition, threaded holes need to be added at the corresponding positions of the end plate 23 to fix the heat dissipation structures 10 located on both sides of the battery module. Considering the height of the battery module, if the structure is relatively compact, the width of the side plate 24 needs to be reduced to reserve a position for installing the heat dissipation structure.

[0078] As Figures 5 to 8 , the present invention provides a heat dissipation system 40, including: a refrigeration device for refrigerating the coolant; a liquid cooling device including: a battery box 30, the battery box 30 includes at least one battery module 20, and the battery module 20 is the above-mentioned battery module; wherein, the liquid cooling pipe groups of each battery module 20 are connected in series with each other to form the liquid cooling pipeline 310 of the corresponding battery box 30, so as to cool the battery box 30 by introducing the coolant into the liquid cooling pipeline 310.

[0079] As Figure 6 shown, a plurality of battery modules 20 in a battery box 30 are connected in series in sequence, and the positive output end of the connection row 22 of one battery module 20 is connected to the negative output end of the connection row 22 of another battery module 20 to form the battery box 30.

[0080] Specifically, for the assembly connection of two adjacent battery modules 20 among the five battery modules 20 in a mirror-symmetrical form, except that the positive and negative electrodes are mirror-symmetrical and not interchangeable, other structural components are common parts. Among them, the liquid cooling pipe groups of the first battery module 20 and the second battery module 20 are connected through a third connecting pipe 28. In the connection of the remaining battery modules 20, the liquid cooling pipe groups of one battery module 20 and another battery module 20 are connected in series through a second connecting pipe 27 to form a series structure among the liquid cooling pipe groups of the five battery modules 20, that is, to form the liquid cooling pipeline 310 of the battery box 30. The outlet and inlet of the liquid cooling pipeline 310 are on the same side of the battery box 30.

[0081] The heat dissipation system 40 of the present invention includes at least one battery box 30. When there are multiple battery boxes 30, since the pipeline flow resistance of the liquid cooling pipeline 310 is greater than that of the liquid cooling plate, the liquid cooling pipelines 310 of the respective battery boxes 30 in the heat dissipation system 40 are arranged in parallel with each other to introduce coolant into the respective liquid cooling pipelines 310 respectively, so as to dissipate heat from the corresponding battery boxes 30.

[0082] The heat dissipation system 40 further includes: a liquid supply device 41 for supplying coolant to the heat dissipation device; a driving pump 42, the input end of the driving pump 42 is connected to the output end of the liquid supply device 41, the output end of the driving pump 42 is connected to the input end of the heat dissipation structure, and the output end of the heat dissipation structure is connected to the input end of the liquid supply device 41 to form a heat dissipation pipeline, so that the coolant in the liquid supply device 41 flows along the heat dissipation pipeline under the drive of the driving pump 42 to take away the heat of the battery box 30.

[0083] Specifically, the liquid supply device 41 is a water tank, and the driving pump 42 is a water pump.

[0084] The refrigeration device mainly consists of a heat exchanger 43, a compressor 44, an expansion valve 45, and a condenser 46. The coolant in the heat dissipation system 40 is driven by the driving pump 42 to flow through the battery box to take away its heat, and then is refrigerated by the refrigeration device where the heat exchanger is located, and then returns to the liquid supply device to form a circulation loop.

[0085] Specifically, the heat exchanger 43 has a first inlet, a first outlet, a second inlet, and a second outlet; among them, inside the heat exchanger, the first inlet and the first outlet are connected, and the second inlet and the second outlet are connected; outside the heat exchanger, the first inlet is connected to the output end of the heat dissipation structure 10 in the battery box 30, the first outlet is connected to the input end of the liquid supply device 41; the second outlet is connected to the compressor 44; the second inlet is connected to the expansion valve 45; the condenser 46 is arranged on the flow pipeline between the compressor 44 and the expansion valve 45 to form a refrigeration pipeline for refrigerating the coolant.

[0086] The high-temperature coolant in the liquid cooling pipeline 310 of the battery box 30 enters the heat exchanger 43 through the first inlet, and after becoming low-temperature coolant, it flows to the liquid supply device through the first outlet.

[0087] The heat dissipation system 40 has a controller 47, and the controller 47 is connected to the battery management system 300, the heat exchanger 43, the liquid supply device 41, the driving pump 42, the condenser 46, the compressor 44, and the expansion valve 45 of the battery box 30, etc., so as to receive the signals fed back by each component and control the working conditions of each component.

[0088] Temperature detection components 431 are provided at both the first inlet and the first outlet of the heat exchanger 43, so as to detect the temperatures of the coolant at the first inlet and the first outlet and transmit the detection signals to the controller 47, to judge the working state of the heat exchanger 43, and then control the opening and closing of the compressor 44.

[0089] A liquid level detection component is provided in the liquid supply device 41, which is used to detect the liquid level in the liquid supply device 41 and transmit its signal to the controller, so as to give a low liquid level alarm when it is detected that the liquid level in the liquid supply device 41 is lower than the preset value.

[0090] The heat dissipation system 40 includes a plurality of flow valves 48. The plurality of flow valves 48 are provided in one-to-one correspondence with the liquid cooling pipelines 310 of each battery box 30, and are located at the input ends of the corresponding liquid cooling pipelines 310, so as to control the flow rate of the coolant entering the corresponding liquid cooling pipelines 310 by adjusting the opening degrees of the respective flow valves 48. The controller 47 controls the opening degree values of the respective flow valves 48 through the temperature signals of each battery box 30 collected by the battery management system 300, so as to adjust the magnitude of the coolant flow rate and ensure that there is sufficient coolant in the liquid cooling pipeline 310 of each battery box 30.

[0091] The present invention provides a control method for a heat dissipation system. The control method for the heat dissipation system is used to control the above-mentioned heat dissipation system 40. The control method for the heat dissipation system includes: collecting the temperature signals of a plurality of battery boxes 30 in the heat dissipation system 40; when the highest temperature T among the collected plurality of temperature signals is greater than the first preset temperature T1, introducing coolant into the liquid cooling pipeline 310 of the battery box 30 and making the refrigeration device of the heat dissipation system 40 in a non-working state; when the highest temperature T among the collected plurality of temperature signals is greater than the second preset temperature T2, turning on the refrigeration function of the refrigeration device to refrigerate the coolant; when the highest temperature T among the collected plurality of temperature signals is less than the third preset temperature T3, turning off the refrigeration function of the refrigeration device; wherein, the second preset temperature T2 is greater than the third preset temperature T3, and the third preset temperature T3 is greater than the first preset temperature T1.

[0092] The control method for the heat dissipation system is specifically as follows:

[0093] The controller 47 receives in real time the temperature signals in multiple battery boxes 30 collected by the battery management system 300;

[0094] When the highest temperature T among the multiple collected temperature signals is greater than the first preset temperature T1, the control drive pump 42 is controlled to start working to introduce the coolant into the liquid cooling pipeline 310 of the battery box 30. The coolant starts to flow to take away the heat in the battery box body. At this time, the compressor 44 does not work;

[0095] If the temperature in the battery box 30 continues to rise at this time, when the highest temperature T among the multiple collected temperature signals is greater than the second preset temperature T2, the compressor 44, the condenser 46 and the expansion valve 45 are controlled to start working to refrigerate the coolant; at the same time, the opening degree of the expansion valve 45 is adjusted by collecting the temperature of the coolant to control the temperature difference of the coolant at the first inlet and the second outlet of the heat exchanger 43;

[0096] After the refrigeration function is turned on, the temperature in the battery box 30 drops. When the highest temperature T among the multiple collected temperature signals is less than the third preset temperature T3, the controller 47 controls the compressor 44 to turn off and at the same time controls the expansion valve 45 to turn off, thereby turning off the refrigeration function. Only the drive pump 42 of the heat dissipation system works to provide the coolant to the liquid cooling pipeline 310 of the battery box 30.

[0097] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0098] The heat dissipation structure provided by the present invention includes a liquid cooling pipe 1 located on the side of the connection row 22 of the battery module away from the battery core assembly 21, and an insulating member 2 provided between the liquid cooling pipe 1 and the connection row 22. Among them, the insulating member 2 is in contact with the liquid cooling pipe 1 and the connection row 22 respectively to transfer the heat of the connection row 22 to the liquid cooling pipe 1 while ensuring the insulation between the liquid cooling pipe 1 and the connection row 22.

[0099] The heat dissipation structure of the present invention is specifically for dissipating heat from the connection row. Under the condition of ensuring the insulation of the connection row 22, it realizes the technical effect of dissipating heat at the connection row 22, improving the heat dissipation efficiency of the battery module, solves the problem of poor heat dissipation effect at the connection row of the battery module in the prior art, and solves the problem that the thermal resistance of the heat transfer from the wound core inside the battery core to the connection row 22 is much smaller than the thermal resistance of the heat transfer to the battery core housing, so the heat at the connection row 22 is large and the temperature is high.

[0100] At the same time, since the connection row 22 is located above the battery module, that is, the upper part of the battery box, the heat dissipation structure of the present invention solves the problem in the prior art that the liquid cooling plate is installed at the bottom of the battery box, which not only needs to have a heat dissipation function but also needs to have the function of supporting the weight of the battery module. Therefore, the proportion of the liquid cooling plate in the battery box is relatively large.

[0101] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A heat dissipation structure, characterized in that, Including: A liquid cooling pipe (1), the liquid cooling pipe (1) is located on the side of the connection row (22) of the battery module away from the battery cell assembly (21), and the extending direction of the liquid cooling pipe (1) is parallel to the extending direction of the connection row (22), so as to dissipate heat from the battery module by passing flowing cooling liquid into the liquid cooling pipe (1); An insulating member (2), the insulating member (2) is strip-shaped, the extending direction of the insulating member (2) is parallel to the extending direction of the liquid cooling pipe (1), the insulating member (2) is located between the liquid cooling pipe (1) and the connection row (22), so as to insulate between the liquid cooling pipe (1) and the connection row (22), and the insulating member (2) is in contact with both the liquid cooling pipe (1) and the connection row (22), so as to transfer the heat of the connection row (22) to the liquid cooling pipe (1); A fixing member (3), the extending direction of the fixing member (3) is parallel to the extending direction of the liquid cooling pipe (1), and the fixing member (3) has a mounting groove (34) and an opening part communicating with the mounting groove (34); Wherein, the fixing member (3) is made of insulating material, the insulating member (2) is arranged on the side of the fixing member (3) close to the opening part, so as to enclose a mounting space through the insulating member (2) and the fixing member (3), the liquid cooling pipe (1) is located in the mounting space, and the fixing member (3) is detachably mounted on the battery module, so as to fix the liquid cooling pipe (1) and the insulating member (2) on the battery module; The fixing member (3) further includes: Two side parts (32), the extending directions of the two side parts (32) are both parallel to the extending direction of the connection row (22), and the two side parts (32) are arranged relatively spaced apart; A connecting part (31), the extending direction of the connecting part (31) is parallel to the extending direction of the connection row (22), and both sides of the connecting part (31) are respectively connected to the two side parts (32), so as to enclose the mounting groove (34) through the connecting part (31) and the two side parts (32); the opening part is located on the side of the two side parts (32) away from the connecting part (31); Wherein, both sides of the two side parts (32) away from the connecting part (31) have mounting surfaces, and both mounting surfaces are in contact with the insulating member (2), so as to enclose the mounting space through the insulating member (2) and the fixing member (3); The insulating member (2) is a ceramic sheet, and the insulating member (2) is pasted on the side of the fixing member (3) close to the connection row (22), so as to enclose the mounting space through the insulating member (2) and the fixing member (3).

2. The heat dissipation structure according to claim 1, wherein Each of the side parts (32) includes: Two mounting parts (320), the two mounting parts (320) are respectively arranged at both ends of the corresponding side part (32) in the extending direction, and the two mounting parts (320) are respectively used for connecting to the two end plates (23) of the battery module.

3. The heat dissipation structure according to claim 1, wherein The fixing member (3) further includes: Avoidance groove (33), the avoidance groove (33) is located on one side of the fixing member (3), and the output end of the connection row (22) extends out of the fixing member (3) through the avoidance groove (33).

4. The heat dissipation structure according to claim 1, wherein The liquid cooling pipe (1) includes: A main cooling section, the extending direction of the main cooling section is parallel to the extending direction of the connection row (22); Two bending sections, the two bending sections are respectively arranged at both ends of the main cooling section, and the extending directions of the two bending sections are opposite to each other, so that the liquid cooling pipe (1) forms a Z-shaped structure, and the outlet and inlet of the liquid cooling pipe (1) are respectively located at the free ends of the two bending sections.

5. The heat dissipation structure according to claim 1, characterized in that, The outer peripheral surface of the liquid cooling pipe (1) includes two relatively arranged planes and two partial arc surfaces connected to the two planes, and one of the planes is attached to the surface of the insulating member (2) away from the connection row (22).

6. A battery module includes a battery cell assembly (21) formed by stacking a plurality of battery cells (210), and a plurality of connection bars (22) connected to the positive or negative electrodes of each of the battery cells (210), characterized in that, The battery module further includes: A plurality of heat dissipation structures (10), the heat dissipation structure (10) is the heat dissipation structure according to any one of claims 1 to 5, and a plurality of the heat dissipation structures (10) are located on the side of the corresponding connection row (22) away from the battery cell assembly (21), and the insulating member (2) of the heat dissipation structure is in contact with the connection row (22), and the liquid cooling pipes (1) in the plurality of heat dissipation structures (10) are connected in series with each other to form a liquid cooling pipe group.

7. The battery module according to claim 6, wherein The plurality of connection rows (22) are divided into two groups, the two groups of connection rows (22) are arranged at intervals, and one of the heat dissipation structures (10) is correspondingly arranged at each of the connection rows (22); the liquid cooling pipes (1) of the two heat dissipation structures corresponding to the two groups of connection rows (22) are connected and communicated.

8. The battery module according to claim 7, wherein, The battery module further includes a first connecting pipe (26), the first connecting pipe (26) is arranged between the liquid cooling pipes (1) of the two heat dissipation structures, so that one liquid cooling pipe (1) is connected and communicated with another liquid cooling pipe (1).

9. The battery module according to claim 8, wherein, The battery module includes end plates (23) arranged at both ends in the length direction of the battery cell assembly (21), and both ends of each heat dissipation structure are respectively connected to the corresponding end plate (23) through fasteners to fix each heat dissipation structure relative to the corresponding connection row (22).

10. The battery module according to claim 9, characterized in that, The battery module includes a pressing plate (25), the extending direction of the pressing plate (25) is parallel to the length direction of the battery cell assembly (21), the pressing plate (25) is arranged on the side of the battery cell assembly (21) close to the connection row (22), the pressing plate (25) is located in the middle of the width direction of the battery cell assembly (21), and both ends in the length direction of the pressing plate (25) are respectively connected to the two end plates (23) to clamp the end plates (23).

11. The battery module according to claim 10, characterized in that, Each of the end plates (23) includes: Two first connecting portions (231), the two first connecting portions (231) are respectively arranged corresponding to the two heat dissipation structures (10), and the two heat dissipation structures (10) and the corresponding first connecting portions (231) are connected through first fasteners; A second connecting portion (232), the second connecting portion (232) being located between the two first connecting portions (231), the second connecting portion (232) being arranged corresponding to the pressing plate (25), and the pressing plate (25) and the second connecting portion (232) being connected by a second fastener.

12. The battery module according to claim 9, wherein, Each of the end plates (23) includes: Two third connecting portions (233) that are parallel to each other and spaced apart, the two third connecting portions (233) being arranged on a side of the end plate (23) away from the battery cell assembly (21), the two third connecting portions (233) being located at one end of the end plate (23) away from the heat dissipation structure (10), so that the battery module is fixed to a corresponding battery box through the third connecting portions (233).

13. The battery module according to claim 9, wherein The battery module further includes: Two side plates (24), the two side plates (24) being located on both sides in the width direction of the battery module, and the two side plates (24) being welded to the two end plates (23).

14. The battery module according to claim 13, wherein Each of the two side plates includes: A first plate body portion, the first plate body portion being parallel to the length direction of the battery module; Two second plate body portions, the two second plate body portions being oppositely arranged at both ends of the first plate body portion, the two second plate body portions being parallel to the end plate (23), and the two second plate body portions being respectively used for welding to the corresponding end plate (23).

15. The battery module according to claim 14, wherein Each of the two end plates (23) includes: Two welding grooves (234), the two welding grooves (234) being respectively located at both ends of the end plate (23) along the width direction of the battery module, the two welding grooves (234) being respectively arranged corresponding to the second plate body portions of the two side plates, for welding to the corresponding second plate body portions.

16. The battery module according to claim 6, wherein The battery module further includes a plurality of the heat dissipation structures arranged on both sides in the width direction of the battery module, and the liquid cooling pipes (1) of each of the heat dissipation structures in the battery module are connected in series and communicated with each other to form a liquid cooling pipe group.

17. A heat dissipation system, characterized in that, including: A refrigeration device for refrigerating the coolant; A liquid cooling device, the liquid cooling device including: a battery box (30), the battery box (30) including at least one battery module (20), and the battery module (20) being the battery module according to any one of claims 6 to 16; Wherein, the liquid cooling pipe groups of the respective battery modules (20) are connected in series and communicated with each other to form a liquid cooling pipeline (310) of the corresponding battery box (30), so as to cool the battery box (30) by introducing the coolant into the liquid cooling pipeline (310).

18. A control method for a heat dissipation system, characterized in that, The control method of the heat dissipation system is used to control the heat dissipation system according to claim 17, and the control method of the heat dissipation system includes: Collecting temperature signals in a plurality of battery boxes (30) of the heat dissipation system; When the highest temperature T among the collected plurality of temperature signals is greater than a first preset temperature T1, introducing the coolant into the liquid cooling pipeline (310) of the battery box (30), and making the refrigeration device of the heat dissipation system in a non-working state; When the highest temperature T among the multiple temperature signals collected is greater than the second preset temperature T2, turn on the refrigeration function of the refrigeration device to refrigerate the coolant; When the highest temperature T among the multiple temperature signals collected is less than the third preset temperature T3, turn off the refrigeration function of the refrigeration device; Wherein, the second preset temperature T2 is greater than the third preset temperature T3, and the third preset temperature T3 is greater than the first preset temperature T1.

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