CN218414931U

CN218414931U - Battery module liquid cooling apron, battery package and car

Info

Publication number: CN218414931U
Application number: CN202222500542.8U
Authority: CN
Inventors: 王美祥; 薛从文
Original assignee: Linkdata New Energy Co Ltd
Current assignee: Linkdata New Energy Co Ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2023-01-31
Anticipated expiration: 2032-09-21

Abstract

The utility model discloses a battery module liquid cooling apron, include: the liquid cooling plate is provided with a refrigerant channel, a liquid inlet and a liquid outlet which are communicated with the refrigerant channel, and is configured to be in contact type heat exchange connection with the battery cell; further comprising: the heat insulation pressure relief pipe is lined on the inner cover surface of the liquid cooling plate, is provided with a pressure relief channel and comprises a pipe bottom plate; the pipe bottom plate and the liquid cooling plate are respectively arranged at two sides of the pressure relief channel; the tube bottom plate is provided with a weak area; the weak area is configured to be separated from the tube bottom plate by thermal runaway jet impact, and the pressure relief channel is configured to guide the thermal runaway jet discharged from the battery cell. The utility model also discloses a battery package of including battery module liquid cooling apron to and the car including the battery package.

Description

Battery module liquid cooling apron, battery package and car

Technical Field

The utility model relates to a lithium ion battery technical field, concretely relates to battery module liquid cooling apron, battery package and car.

Background

The battery is one of the main power sources of the new energy automobile. The main structure of the battery pack comprises a battery module, a mechanism system, an electrical system and a thermal management system. Wherein, mechanism's system includes upper cover, tray, metal support, end plate etc. and the thermal management system who commonly uses mainly is four types: air cooling, water cooling, liquid cooling and phase change materials.

In traditional battery package structure, upper cover and liquid cooling plate independent setting. In the improved technical scheme, the liquid cooling plate with the refrigerant flow channel is directly used as the upper cover so as to reduce the Z-direction space occupied by the upper cover plate and the liquid cooling plate. The liquid cooling plate usually uses water as a cooling medium. The defects of the water-cooling upper cover are as follows: a large amount of heat and harmful gas that can give out when the battery thermal runaway, the high temperature gas that erupts from electric core explosion-proof valve can pierce through whole liquid cold drawing, and then influences other electric cores on every side.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an one of the purpose lies in overcoming the defect that exists among the prior art, provides a battery module liquid cooling apron, and liquid cooling board strengthens each other with thermal-insulated pressure relief pipe two parts, improves the thermal runaway protective capacities of battery system to electric core.

In order to realize the technical effect, the utility model discloses a technical scheme does: the utility model provides a battery module liquid cooling apron, includes:

the liquid cooling plate is provided with a refrigerant channel, a liquid inlet and a liquid outlet which are communicated with the refrigerant channel, and is configured to have an inner cover surface in contact type heat exchange connection with the battery cell; further comprising:

the heat insulation pressure relief pipe is lined on the inner cover surface of the liquid cooling plate, is provided with a pressure relief channel and comprises a pipe bottom plate; the pipe bottom plate and the liquid cooling plate are respectively arranged on two sides of the pressure relief channel, and the pipe bottom plate is provided with a weak area; the weak area is configured to be separated from the tube bottom plate by thermal runaway jet impact, and the pressure relief channel is configured to guide the thermal runaway jet discharged from the battery cell.

The preferred technical scheme is that the heat insulation pressure relief pipe is fixedly connected with the liquid cooling plate.

The preferable technical scheme is that the heat-insulation pressure-relief pipe further comprises a pipe top groove, the pipe top groove is connected with the pipe bottom plate in a sealing mode, and the pressure-relief channel is arranged between the pipe top groove and the pipe bottom plate.

The preferable technical scheme is that the pipe top groove comprises a groove structure layer, and the groove structure layer is integrally connected with the liquid cooling plate.

The preferable technical scheme is that a heat insulation layer is arranged on the inner wall of the heat insulation pressure relief pipe.

The preferred technical scheme does, the weak area is provided with the attenuate connecting portion.

The preferable technical scheme is that the thinning connecting part comprises an annular thinning groove and at least two linear thinning grooves; one end of the linear thinning groove is communicated with the annular thinning groove, and the other end of the linear thinning groove is intersected with the central area of the annular thinning groove.

The preferable technical scheme is that a convex rib is arranged in the refrigerant channel and arranged on the surface of the heat insulation and pressure relief pipe.

A second object of the present invention is to provide a battery pack, which includes the above-mentioned liquid cooling cover plate for battery module.

The third object of the present invention is to provide a car, including the above-mentioned battery pack.

The utility model has the advantages and beneficial effects that:

the heat-insulation pressure-relief pipe liner in the liquid cooling cover plate of the battery module is arranged below the liquid cooling plate, when the battery core is out of control due to heat, pressure generated by heat flow gas ejected from the battery core explosion-proof valve impacts a weak area, the weak area forms a pressure-relief opening in a pipe bottom plate, and an ejection object out of control due to heat enters a pressure-relief channel and is exhausted directionally along the pressure-relief channel;

the impact force applied to the heat pressure release pipe in the pressure release process is dispersed through the lining surface of the heat pressure release pipe and the liquid cooling plate, and the thermal runaway protection capability of the battery system to the battery cell is favorably improved.

Drawings

FIG. 1 is a schematic perspective view of a liquid-cooled cover plate of a battery module according to an embodiment;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic perspective view of a liquid-cooled cover plate of the battery module according to an embodiment;

FIG. 4 is a partial enlarged view of B in FIG. 3;

FIG. 5 is a schematic structural view of a battery pack according to an embodiment;

in the figure: 1. a liquid-cooled plate; 11. a refrigerant channel; 12. a rib is protruded;

2. a heat-insulating pressure relief pipe; 21. a pressure relief channel; 22. a tube bottom plate; 221. a weakened area; 2211. an annular thinning groove; 2212. a linear thinning groove; 222. a plate main body portion; 23. a pipe top groove; 231. a slot structure layer; 232. a thermal insulation layer;

3. a heat-conducting adhesive layer; 4. an explosion-proof valve; 5. a bus bar.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

In the description of the present invention, it should be further noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

Examples

As shown in fig. 1-4, the liquid cooling cover plate of the battery module in the embodiment includes a liquid cooling plate 1, the liquid cooling plate 1 is provided with a cooling medium channel 11, and a liquid inlet and a liquid outlet (not shown in the figure) communicated with the cooling medium channel 11, and the liquid cooling plate 1 is configured such that an inner cover surface is in contact type heat exchange connection with the battery core; the liquid cooling plate is characterized by further comprising a heat insulation pressure relief pipe 2, wherein the heat insulation pressure relief pipe 2 is lined on the inner cover surface of the liquid cooling plate 1, the heat insulation pressure relief pipe 2 is provided with a pressure relief channel 21, the heat insulation pressure relief pipe 2 comprises a pipe bottom plate 22, and the pipe bottom plate 22 and the liquid cooling plate 1 are respectively arranged on the lower side and the upper side of the pressure relief channel 21; the tube bottom plate 22 is provided with a weakened area 221; the weakened region 221 is configured to separate from the tube bottom plate 22 upon impact with a thermal runaway spray, and the pressure relief channel 21 is configured to direct the thermal runaway spray exiting the cell.

The liquid cooling plate 1 uses liquid as a cooling medium, the liquid cooling medium can be selected from water, mineral oil and other insulated known liquid cooling media, the temperature rising cooling medium flowing out from the liquid outlet is subjected to temperature reduction treatment through a circulating pipeline connected with a water pump and a condenser, and then flows back to the cooling medium channel 11 through the liquid inlet. The liquid cooling plate is provided with an outer cover surface and an inner cover surface, and the inner cover surface is arranged towards the electric core in the battery pack; the outer cover surface is used for bearing other vehicle body structural parts which are in compression joint with the battery pack.

The impact force of the thermal runaway jet acts on the heat insulation pressure relief pipe 2 and is transmitted to the liquid cooling plate 1, so that the abutting area of the two parts is gradually enlarged in the lining structure of the liquid cooling plate 1 and the heat insulation pressure relief pipe 2, and the impact stress is favorably dispersed. Optionally, the heat-insulation pressure-relief pipe 2 is a square pipe, and further, the pipe wall of the square pipe comprises a first pipe wall and a second pipe wall which are paired, and the side length corresponding to the first pipe wall on the cross section of the square pipe is larger than the side length corresponding to the second pipe wall. Tube bottom plate 22 is a first tube wall. Optionally, the side walls of the heat-insulating pressure-releasing pipe 2 are integrally connected, or the periphery of the pipe is formed by enclosing more than two parts in a sealing connection manner.

The weakened area 221 is configured to form a pressure relief vent in tube base 22 that accommodates the passage of a thermal runaway jet. The tube bottom plate 22 is composed of a weak area 221 and a plate main body part 222, the weak area 221 is in a block shape, and optionally, a pressure relief opening is formed by enclosing the plate main body part 222 and the tube bottom plate 22, or the whole weak area 221 is completely separated from the tube bottom plate 22 to form the pressure relief opening, or the weak area 221 is broken to form the pressure relief opening.

In another embodiment, as shown in fig. 1-2, the heat-insulating pressure-relief tube 2 is fixedly connected to the liquid-cooled panel 1. The fixedly connected heat insulation pressure relief pipe 2 and the liquid cooling plate 1 form a more stable reinforcing structure. The connection between the two parts is a detachable fixed connection or a non-detachable fixed connection. The detachable connection is for example bolted connection, riveting, and the non-detachable connection can be selected as welding, or the thermal insulation pressure relief pipe 2 and the liquid cooling plate 1 are an integral section.

In another embodiment, as shown in fig. 2, the heat insulation and pressure relief pipe 2 further comprises a pipe top groove 23, the pipe top groove 23 is connected with the pipe bottom plate 22 in a sealing manner, and the pressure relief channel 21 is arranged between the pipe top groove 23 and the pipe bottom plate 22. The pipe top tank 23 includes a tank structure layer 231, and the tank structure layer 231 is integrally connected to the liquid cooling plate 1. The groove surface of the pipe top groove 23 is directly impacted by thermal runaway jet and also used as an integrated reinforcing rib of the liquid cooling plate 1; compared with two split components, the integrated tank structure layer 231 occupies a small space with the liquid cooling plate 1, is beneficial to saving the space in the battery pack, reduces the number of battery system parts and assembly steps, and is beneficial to reducing the cost.

In the figure, the layer thickness of the groove structure layer 231 is larger than that of the liquid cooling plate 1, and the layer thickness of the groove structure layer 231 is specifically determined according to the burst pressure value of the thermal runaway jet.

In another embodiment, shown in figure 2, the inner wall of the tube top channel 23 is provided with insulation 232. The groove structural layer 231 of body coupling is the metal material with liquid cooling plate 1 usually, and metal intensification is fast and heat conduction is rapid under the same difference in temperature condition, and insulating layer 232 does benefit to and maintains the temperature of groove structural layer 231 and liquid cooling plate 1 at predetermined lower within range under the thermal runaway condition, further alleviates the influence of electric core thermal runaway to other electric cores in the same module. The material of the thermal insulation layer can be selected from known silicon dioxide aerogel, high silicon oxygen cotton, superfine glass cotton, foam cotton, plastic foam and the like.

The tube bottom plate 22 is also made of a plate material having both temperature resistance and heat insulation properties, and a layer structure including a groove structure layer 231 and a heat insulation layer 232 in the tube top groove 23 can be selected.

In another embodiment, shown in fig. 3-4, the weakened area 221 is provided with a thinned connection. The thickness of the reduced connecting portion is smaller than the thickness of the plate main body portion. Optionally, the plate thicknesses of the plate main body portion and the thinning connecting portion are constant values, or the thickness of the thinning connecting portion gradually decreases from the side to the middle plate thickness, for example, the surface of the thinning connecting portion is a V-shaped groove or a trapezoidal groove recessed in the plate main body portion. The thinning connection part is arranged on the outer surface of the tube bottom plate 22 facing the battery cell and/or on the inner surface of the tube bottom plate 22 facing the tube top groove 23, and is only arranged on the outer surface of the tube bottom plate 22 in the figure.

As shown in fig. 4, in another embodiment, the thinning connection includes an annular thinning groove 2211 and at least two linear thinning grooves 2212; one end of the linear thinning groove 2212 communicates with the annular thinning groove 2211, and the other end meets at the central region of the annular thinning groove 2211. Further, the thinning joint includes at least three linear thinning grooves 2212 therein. Alternatively, the thinning joint may include at least three linear thinning grooves 2212 that meet, the linear thinning grooves 2212 being equiangularly spaced around the periphery of the meeting point. The linear thinning groove may be selected from an arc shape or a linear shape without particular limitation.

The center area may be selected to be any point within the ring of the annular thinning groove 2211, preferably the center point. The number of linear thinning grooves 2212 can be two, four, five or even more. Four linear thinning grooves 2212 are arranged in the annular thinning groove 2211 in a cross shape, and the annular thinning groove 2211 is in a long hole shape. In the assembly structure of the battery pack, the cross intersection point of the linear thinning grooves 2212 is preferably concentrically arranged with the battery cell explosion-proof valve, the thermal runaway jet of the battery cell explosion-proof valve is intensively acted on the cross intersection point, the weak area is torn along the linear thinning grooves 2212 by the cross intersection point, and the included angle part between the linear thinning grooves 2212 is folded into the heat insulation pressure relief pipe 2.

In another embodiment, as shown in fig. 1, a rib 12 is provided in the refrigerant channel 11, the rib 12 is connected between the top plate of the liquid cooling plate 1 and the pipe top groove 23, and the heat insulation pressure relief pipe 2 is lined below at least one rib 12. The ribs 12 in the coolant channel 11 not only enhance the mechanical strength of the liquid-cooled plate 1, separate the coolant channel 11 of the liquid-cooled plate 1, and guide the coolant to flow along a predetermined path, but also serve as reinforcing ribs for the heat insulation and pressure relief pipe 2. As shown in the figure, the extending direction of the ribs 12 coincides with the longitudinal direction of the heat insulation and pressure release pipe 2, and the heat insulation and pressure release pipe 2 is lined below the two ribs 12. Instead of enhancing the heat insulation and pressure relief pipe, the rib 12 may be connected to the pipe top groove 23 only and spaced apart from the top plate of the liquid cooling plate 1.

The reinforcing function of the convex rib 12 on the heat insulation and pressure relief pipe 2 is local pipe section reinforcing or whole heat insulation and pressure relief pipe 2 reinforcing. As an alternative to enhancing the heat insulation and pressure release pipe 2, the extending direction of the convex rib 12 and the length direction of the heat insulation and pressure release pipe 2 may be perpendicular or form an acute included angle therebetween. Further, the rib 12 is opposite to the weak area 221.

As shown in fig. 5, the battery pack of the embodiment includes the liquid-cooled cover plate of the battery module of the above embodiment. Besides the structure of the above embodiment, the liquid cooling cover plate of the battery module further includes necessary connecting members, the liquid cooling cover plate of the battery module is detachably and fixedly connected with the tray through the connecting members, and the connecting members are of known structures, including but not limited to bolted connections. In the structure of the battery pack, a liquid cooling plate 1 is in contact type heat exchange connection with a heating part of a battery module through a heat-conducting adhesive layer 3, and the heating part comprises but is not limited to a bus bar 5; the weak area of the heat insulation pressure relief pipe 2 is opposite to the explosion-proof valve 4 of the battery cell up and down.

An embodiment is an automobile including the battery pack of the above embodiment. The liquid cooling cover plate of the battery module needs to have enough structural strength to support the relevant parts such as the seat of the whole vehicle.

The working process of the liquid cooling cover plate of the battery module is as follows:

when the battery core works normally, heat of a bus bar of the heating part and the like is transferred to the liquid cooling plate through the heat conducting adhesive layer to exchange heat with a refrigerant in the liquid cooling plate, so that the heating part of the bus bar and the like is maintained in a preset working temperature range;

when the battery core is out of control due to heat, the pressure generated by the heat flow gas ejected by the battery core explosion-proof valve breaks the weak area of the heat insulation pressure relief pipe, and the heat flow gas enters the pressure relief channel to carry out directional exhaust; the influence of heat flow gas or flame in the pressure relief channel on the water cooling plate, the battery cell upper cover, the pole, the busbar and the like is small through heat conduction, heat convection and heat radiation, so that the normal battery cell in the same battery pack is protected.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a battery module liquid cooling apron, includes:

the liquid cooling plate is provided with a refrigerant channel, a liquid inlet and a liquid outlet which are communicated with the refrigerant channel, and the liquid cooling plate is configured in a way that the inner cover surface is in contact type heat exchange connection with the battery cell; it is characterized by also comprising:

2. The liquid-cooled cover plate for a battery module according to claim 1, wherein the heat-insulating pressure relief pipe is fixedly connected with the liquid-cooled plate.

3. The liquid-cooled cover plate for battery modules according to claim 1, wherein the heat-insulating and pressure-releasing pipe further comprises a pipe top groove, the pipe top groove is connected with the pipe bottom plate in a sealing manner, and the pressure-releasing channel is arranged between the pipe top groove and the pipe bottom plate.

4. The liquid cooled cover plate for a battery module of claim 3, wherein the tube top groove comprises a groove structure layer integrally connected to the liquid cooled plate.

5. The battery module liquid-cooled cover plate according to claim 1, wherein the inner wall of the heat-insulating pressure relief pipe is provided with a heat-insulating layer.

6. The liquid-cooled cover plate for battery modules as recited in claim 1, wherein the weakened area is provided with a thinned connecting portion.

7. The battery module liquid cooled cover plate of claim 6, wherein the thinned connecting portion comprises an annular thinned groove and at least two linear thinned grooves; one end of the linear thinning groove is communicated with the annular thinning groove, and the other end of the linear thinning groove is intersected with the central area of the annular thinning groove.

8. The liquid-cooled cover plate for battery modules according to claim 1, wherein a rib is disposed in the coolant channel, and the rib is disposed on a surface of the heat-insulating pressure-relief pipe.

9. A battery pack, comprising the liquid cooling cover plate of any one of claims 1 to 8.

10. An automobile comprising the battery pack according to claim 9.