Composite cooling plate and battery pack

Abstract

The utility model relates to the field of cooling devices, in particular to a composite cooling plate and a battery pack. The composite cooling plate is arranged on one side, provided with an anti-explosion valve, of the battery module so as to cool the battery module, and the composite cooling plate comprises a surface plate and a runner plate; the runner plate is provided with a first groove facing the battery module; the surface plate is located between the battery module and the runner plate, and the surface plate covers the first groove to form a runner; the flat panel is provided with a first through hole, the runner plate is provided with a second through hole, and the first through hole and the second through hole are communicated and are opposite to the area of an anti-explosion valve of the battery module. According to the composite cooling plate provided by the invention, the function of cooling the battery module can be achieved, and the composite cooling plate is also provided with the exhaust channel, so that the battery module subjected to thermal runaway can be exhausted in time, and the safety performance of the battery module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cooling devices, in particular to a composite cooling plate and a battery pack. BACKGROUND

[0002] In the prior art, liquid cooling plates are widely used as an effective heat dissipation device. Liquid cooling plates are usually used inside battery packs, and their main function is to conduct heat from the battery cells through the cooling liquid channel, thereby achieving temperature control of the battery pack. This method can effectively reduce the temperature inside the battery pack, prolong the battery life, and improve the battery performance.

[0003] The design of the liquid cooling plate is mainly to meet the regular heat dissipation needs of the battery pack. The existing liquid cooling plate structure usually only contains the channel of the cooling liquid, without considering the safety protection needs in the case of thermal runaway of the battery. In the case of thermal runaway, the battery cells may generate a large amount of gas, which will be discharged through the explosion-proof valve, but since the existing liquid cooling plate does not provide an exhaust channel for the explosion-proof valve of the battery cell, the gas cannot be effectively discharged when thermal runaway occurs, resulting in a single function of the liquid cooling plate, which cannot fully cope with the thermal runaway of the battery pack. This functional limitation limits the applicability and safety of the liquid cooling plate under extreme conditions. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to provide a composite cooling plate and a battery pack for cooling battery cells, and the composite cooling plate can form an exhaust channel to discharge a large amount of gas generated by the battery cells, thereby coping with the thermal runaway of the battery pack.

[0005] The present application provides a composite cooling plate arranged on one side of a battery module having an explosion-proof valve to cool the battery module, the composite cooling plate comprising a planar plate and a flow channel plate.

[0006] The flow channel plate is provided with a first groove facing the battery module; the planar plate is located between the battery module and the flow channel plate, and the planar plate covers the first groove to form a flow channel.

[0007] The planar plate is provided with a first through hole, and the flow channel plate is provided with a second through hole, the first through hole and the second through hole are in communication, and both are opposite to the area of the explosion-proof valve of the battery module.

[0008] In the above technical solution, further, the first through hole comprises a perforated portion and a communication portion.

[0009] The number of the perforated portions is multiple, and the multiple perforated portions correspond one-to-one to the multiple explosion-proof valves of the battery module.

[0010] The communication portion is connected between two adjacent perforated portions.

[0011] In the technical solution, further, the perforated part is circular.

[0012] And / or the communication part is a zigzag line.

[0013] In the technical solution, further, the side of the flat plate facing the battery module is provided with a relief groove, the groove opening of the relief groove is opposite to the area of the explosion-proof valve, and the first through hole is arranged at the groove bottom of the relief groove.

[0014] In the technical solution, further, a support plate is further included.

[0015] The support plate is located at the side of the flow channel plate away from the flat plate, and the support plate is provided with a second groove matched with the first groove, so that the support plate is connected with the flow channel plate.

[0016] In the technical solution, further, the support plate is provided with a collection groove matched with the second through hole, the groove opening of the collection groove faces the flow channel plate, and the collection groove is in communication with the second through hole.

[0017] In the technical solution, further, the collection groove is filled with fire extinguishing agent, and the groove opening of the collection groove is provided with a sealingly connected isolation film to encapsulate the fire extinguishing agent in the collection groove.

[0018] In the technical solution, further, one of the support plate and the flow channel plate is provided with at least one mounting protrusion, and the other is provided with a mounting hole corresponding to the mounting protrusion, the mounting protrusion is arranged in the mounting hole to connect the support plate and the flow channel plate.

[0019] In the technical solution, further, the side of the flat plate facing the battery module is provided with a heat-conducting pad, the heat-conducting pad is provided with a third through hole, the third through hole is opposite to the area of the explosion-proof valve, and the third through hole is in communication with the first through hole.

[0020] The application further provides a battery pack including a battery module and the composite cooling plate.

[0021] Compared with the prior art, the application has the following beneficial effects:

[0022] The composite cooling plate provided by the application not only has the function of cooling the battery module, but also is provided with an exhaust passage to timely exhaust the battery module in thermal runaway, thereby improving the safety performance of the battery module.

[0023] The application also provides a battery pack comprising the composite cooling plate described in the above scheme. Based on the above analysis, the battery pack also has the beneficial effects described above, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The first assembly structure diagram of the composite cooling plate and the battery module provided by the present application is shown in the figure.

[0026] Figure 2 The exploded structure diagram of the composite cooling plate provided by the present application is shown in the figure.

[0027] Figure 3 The structure diagram of the composite cooling plate provided by the present application on the plane plate side is shown in the figure.

[0028] Figure 4 The partial cross-sectional structure diagram of the composite cooling plate provided by the present application is shown in the figure.

[0029] Figure 5 The second assembly structure diagram of the composite cooling plate and the battery module provided by the present application is shown in the figure.

[0030] Figure 6 The structure diagram of the flow channel plate provided by the present application is shown in the figure.

[0031] Figure 7 The structure diagram of the support plate provided by the present application is shown in the figure.

[0032] In the figure: 101-plane plate; 102-flow channel plate; 103-battery module; 104-first groove; 105-first through hole; 106-second through hole; 107-punching part; 108-communication part; 109-avoidance groove; 110-support plate; 111-second groove; 112-collection groove; 113-isolation film; 114-mounting protrusion; 115-mounting hole; 116-heat-conducting pad; 117-third through hole; 118-explosion-proof valve. DETAILED DESCRIPTION

[0033] The technical solutions of the present application will be described clearly and completely in the description below in conjunction with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0034] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] Embodiment one

[0037] Referring to Figures 1 to 7 As shown, the composite cooling plate provided by the present application is in surface contact with the battery module 103, and cooling liquid flows in the composite cooling plate to exchange heat with the battery module 103 in countercurrent, thereby achieving cooling of the battery module 103.

[0038] Specifically, the composite cooling plate is arranged on the side of the battery module 103 having the explosion-proof valve 118. The composite cooling plate includes a flat plate 101 and a flow channel plate 102. The flow channel plate 102 is provided with a first groove 104 facing the battery module 103, and the first groove 104 extends zigzag on the flow channel plate 102, which can increase the flow path of the cooling liquid to achieve better cooling effect. The flat plate 101 is located between the battery module 103 and the flow channel plate 102, and the flat plate 101 covers the opening of the first groove 104, that is, the first groove 104 is closed to form a flow channel for the cooling liquid to flow.

[0039] As Figure 1 and Figure 5As shown, the battery module 103 is located directly above the composite cooling plate, and the explosion-proof valve is arranged in an inverted manner. Since the explosion-proof valve 118 of the battery module 103 faces the composite cooling plate, in the case of thermal runaway, the battery module 103 can generate a large amount of gas, which is discharged through the explosion-proof valve. In order to provide an exhaust passage for the explosion-proof valve, a first through hole 105 is formed in the planar plate 101, and a second through hole 106 is formed in the flow channel plate 102, the first through hole 105 and the second through hole 106 are in communication, and both of them are opposite to the area of the explosion-proof valve 118 of the battery module 103, so as to form an exhaust passage. When the explosion-proof valve discharges gas, the gas can be discharged through the first through hole 105 and the second through hole 106 to relieve the pressure of the battery module 103, so as to cope with the thermal runaway of the battery pack.

[0040] It should be noted that the first groove 104 surrounds the periphery of the second through hole 106, and the first groove 104 and the second through hole 106 are not in communication with each other, so that the exhaust passage and the flow channel of the cooling liquid flow are independent of each other.

[0041] The composite cooling plate provided by the present application not only has the function of cooling the battery module 103, but also has an exhaust passage, which can timely exhaust the battery module 103 in thermal runaway and improve the safety performance of the battery module 103.

[0042] In an optional scheme of the embodiment, the first through hole 105 includes a perforated portion 107 and a communication portion 108. The number of the perforated portions 107 is multiple, and the multiple perforated portions 107 correspond to the multiple explosion-proof valves 118 of the battery module 103 one by one. When any one of the explosion-proof valves 118 discharges gas, the corresponding perforated portion 107 forms an exhaust passage to release the gas.

[0043] Further, the two adjacent perforated portions 107 are communicated through the communication portion 108. When the battery module 103 is relieved, the perforated portion 107 can drive the communication portion 108 to crack, so that the first through hole 105 can be completely broken, thereby achieving the purpose of rapid exhaust.

[0044] As shown in detail, Figure 3 The perforated portion 107 is circular to match the circular explosion-proof valve 118. For other shapes of the explosion-proof valve 118, the shape of the perforated portion 107 can be correspondingly arranged. The communication portion 108 is in the form of a broken line, and a sharp structure with weak strength is formed at the communication portion 108. When the battery module 103 is relieved, the communication portion 108 is more likely to be forced to crack, thereby achieving the purpose of rapid exhaust.

[0045] In an optional solution of the embodiment, the side of the flat plate 101 facing the battery module 103 is provided with a relief groove 109, the groove of the relief groove 109 is opposite to the area of the explosion-proof valve 118, so that the relief groove 109 can accommodate the protruding explosion-proof valve 118, and ensure that the battery module 103 is attached to the composite cooling plate. The first through hole 105 is opened at the groove bottom of the relief groove 109. The setting of the relief groove 109 thins the material thickness at the first through hole 105. When the battery module 103 is pressure released, the first through hole 105 is more easily broken, thereby achieving the purpose of rapid exhaust.

[0046] In an optional solution of the embodiment, the composite cooling plate further comprises a support plate 110; the support plate 110 is located on the side of the flow channel plate 102 away from the flat plate 101, and the support plate 110 is provided with a second groove 111 matched with the first groove 104, so that the support plate 110 is attached and connected with the flow channel plate 102.

[0047] In the prior art, the flow channel plate is mostly a single-layer plate without other structural support, which causes the weak pressure-bearing capacity of the flow channel plate and cannot meet the requirement of supporting the bottom of the battery module 103. In the embodiment, the support plate 110 is arranged below the flow channel plate 102 to attach with the flow channel plate 102, so as to increase the strength of the flow channel plate 102.

[0048] In an optional solution of the embodiment, one of the support plate 110 and the flow channel plate 102 is provided with at least one mounting protrusion 114, and the other is provided with a mounting hole 115 corresponding to the mounting protrusion 114, the mounting protrusion 114 is arranged in the mounting hole 115 to connect the support plate 110 and the flow channel plate 102.

[0049] In the embodiment, as shown in Figure 2 and Figure 4 , the mounting protrusion 114 of the support plate 110 is assembled with the mounting hole 115 of the flow channel plate to form an integral body, and then is brazed with the flat plate 101. The support plate 110 is made of a high-strength plastic plate, and the melting point temperature of the high-strength plastic plate is higher than the brazing temperature. The support plate 110 is hot riveted through the mounting protrusion 114 and the mounting hole 115 of the flow channel plate. The high-strength plastic plate not only increases the overall strength of the composite cooling plate, but also has a certain buffering capacity.

[0050] In an optional solution of the embodiment, the support plate 110 is provided with a collection groove 112 matched with the second through hole 106, the groove of the collection groove 112 faces the flow channel plate 102, and the collection groove 112 is in communication with the second through hole 106. The collection groove arranged on the support plate 110 can accommodate the gas mixture discharged from the battery module 103, so as to prevent the mixture from overflowing and causing pollution.

[0051] In an optional solution of the embodiment, the collection groove 112 is filled with fire extinguishing agent, and a sealingly connected isolation film 113 is arranged at the groove opening of the collection groove 112 to encapsulate the fire extinguishing agent in the collection groove 112.

[0052] In the embodiment, in a normal state, the fire extinguishing agent is encapsulated in the collection groove 112 by the isolation film 113. When the battery module 103 is in thermal runaway, the high-temperature gas discharged by the explosion-proof valve 118 can melt the isolation film 113, so that the fire extinguishing agent in the collection groove 112 can extinguish the thermal runaway battery module 103. Specifically, the isolation film 113 is about 1 mm away from the groove bottom of the collection groove 112, and the gap therebetween is filled with fire extinguishing agent. The thickness of the isolation film 113 is ≤0.5 mm, and the outer edges of the isolation film 113 are adhesively connected to the inner walls of the collection groove.

[0053] Embodiment Two

[0054] The composite cooling plate in the embodiment two is an improvement on the basis of the above-mentioned embodiment, and the technical content disclosed in the above-mentioned embodiment is not repeatedly described, and the content disclosed in the above-mentioned embodiment also belongs to the content disclosed in the embodiment two.

[0055] Referring to Figure 2 In an optional solution of the embodiment, the side of the planar plate 101 facing the battery module 103 is provided with a heat-conducting pad 116, so that the heat generated by the battery module 103 can be conducted to the underlying planar plate 101 and flow channel plate, thereby achieving the effect of cooling the battery module 103. The heat-conducting pad 116 is provided with a third through hole 117 opposite the area of the explosion-proof valve 118, and the third through hole 117 is in communication with the first through hole 105, i.e., the third through hole 117, the first through hole 105 and the second through hole 106 are in communication in sequence to form an exhaust passage, thereby achieving the effect of pressure relief for the battery module 103.

[0056] Embodiment Three

[0057] The embodiment three of the application provides a battery pack, which comprises a battery module 103 and a composite cooling plate according to any one of the above-mentioned embodiments, and the side of the battery module 103 facing the composite cooling plate is provided with an explosion-proof valve 118. The composite cooling plate can cool the battery module 103, and when the explosion-proof valve discharges gas, the gas can be discharged through the composite cooling plate to relieve the pressure of the battery module 103, thereby coping with the situation of thermal runaway of the battery pack.

[0058] It should be noted that the above-mentioned embodiments are only used to illustrate but not to limit the technical solutions of the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still make modifications to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application. In addition, those skilled in the art can understand that the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments, although some embodiments include certain features rather than other features included in other embodiments.

Claims

1. A composite cooling plate, disposed on the side of a battery module (103) having an explosion-proof valve (118), for cooling the battery module (103), characterized in that, The composite cooling plate includes a flat plate (101) and a flow channel plate (102); The flow channel plate (102) is provided with a first groove (104) facing the battery module (103); the planar plate (101) is located between the battery module (103) and the flow channel plate (102), and the planar plate (101) covers the first groove (104) to form a flow channel; The planar plate (101) has a first through-hole (105), and the flow channel plate (102) has a second through-hole (106). The first through-hole (105) and the second through-hole (106) are connected and are both opposite to the area of ​​the explosion-proof valve (118) of the battery module (103).

2. The composite cooling plate according to claim 1, characterized in that, The first through-hole (105) includes a perforation portion (107) and a connecting portion (108); The number of the perforated portions (107) is multiple, and the multiple perforated portions (107) correspond one-to-one with the multiple explosion-proof valves (118) of the battery module (103); The two adjacent perforated portions (107) are connected by the connecting portion (108).

3. The composite cooling plate according to claim 2, characterized in that, The perforated portion (107) is circular; And / or the connecting portion (108) is in the shape of a broken line.

4. The composite cooling plate according to claim 1, characterized in that, The planar plate (101) is provided with a clearance groove (109) on the side facing the battery module (103). The opening of the clearance groove (109) is opposite to the area of ​​the explosion-proof valve (118). The first through-hole (105) is opened at the bottom of the clearance groove (109).

5. The composite cooling plate according to claim 1, characterized in that, It also includes a support plate (110); The support plate (110) is located on the side of the flow channel plate (102) away from the flat plate (101), and the support plate (110) is provided with a second groove (111) adapted to the first groove (104) so ​​that the support plate (110) and the flow channel plate (102) are in close contact.

6. The composite cooling plate according to claim 5, characterized in that, The support plate (110) is provided with a collection groove (112) adapted to the second through opening (106). The opening of the collection groove (112) faces the flow channel plate (102), and the collection groove (112) is correspondingly connected to the second through opening (106).

7. The composite cooling plate according to claim 6, characterized in that, The collection tank (112) is filled with fire extinguishing agent, and a sealed isolation membrane (113) is provided at the opening of the collection tank (112) to encapsulate the fire extinguishing agent in the collection tank (112).

8. The composite cooling plate according to claim 5, characterized in that, One of the support plate (110) and the flow channel plate (102) is provided with at least one mounting protrusion (114), and the other is provided with a corresponding mounting hole (115). The mounting protrusion (114) is placed in the mounting hole (115) to connect the support plate (110) and the flow channel plate (102).

9. The composite cooling plate according to claim 1, characterized in that, A thermal pad (116) is provided on the side of the flat plate (101) facing the battery module (103). The thermal pad (116) has a third through-hole (117). The third through-hole (117) is opposite to the area of ​​the explosion-proof valve (118). The third through-hole (117) is connected to the first through-hole (105).

10. A battery pack, characterized in that, It includes a battery module (103) and a composite cooling plate as described in any one of claims 1 to 9, wherein an explosion-proof valve (118) is provided on the side of the battery module (103) facing the composite cooling plate.

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