CN219591506U - Battery module, battery thermal management system and electric automobile - Google Patents

Abstract

The utility model discloses a battery module, which comprises at least one row of battery packs; and the heat exchange surface of the heat management assembly is connected with the battery cell of the battery pack, a roundabout heat exchange pipeline is arranged in the heat management assembly, and the heat exchange pipeline is filled with a heat exchange medium so that the heat exchange medium exchanges heat with the battery cell and the phase state change is completed. Meanwhile, a battery thermal management system applying the battery module and an electric automobile applying the battery pack are also disclosed, the problem of low heat exchange efficiency of the existing heat exchange mode is solved, and the requirements of high-rate charge and discharge thermal management of the battery system are met.

Description

Battery module, battery thermal management system and electric automobile

Technical Field

The utility model relates to the field of batteries, in particular to a battery module, a battery thermal management system and an electric automobile.

Background

The power battery belongs to the power core of the electric automobile, and the service performance and the safety of the power battery influence the service performance and the driving mileage of the electric automobile. And the safety, the service performance, the charge and discharge performance and the cycle life of the power battery are affected by temperature.

At present, the power battery is cooled by adopting a convection heat exchange mode, and the heat exchange efficiency of the convection heat exchange mode is low, so that the problem of low cooling effect is caused. Along with the gradual increase of the multiplying power of the power battery, the existing convection heat exchange mode can not meet the high-multiplying power charge and discharge heat management requirement of a battery system.

Disclosure of Invention

In order to overcome at least one defect of the prior art, the utility model provides a battery module, a battery thermal management system and an electric automobile, solves the problem of low heat exchange efficiency of the existing heat exchange mode, and is beneficial to the requirements of high-rate charge and discharge thermal management of the battery system.

The utility model adopts the technical proposal for solving the problems that:

a battery module, comprising:

at least one row of battery packs;

and the heat exchange surface of the heat management assembly is connected with the electric core of the battery pack, a roundabout heat exchange pipeline is arranged in the heat management assembly, and a heat exchange medium is filled in the heat exchange pipeline so that the heat exchange medium exchanges heat with the electric core and the phase change is completed.

In some embodiments of the utility model, a heat-conducting glue is disposed on a heat-exchanging surface of the thermal management component, and the heat-exchanging surface is in heat-conducting connection with the electric core through the heat-conducting glue.

In some embodiments of the utility model, the battery module further comprises an expansion valve assembled and fixed to the thermal management assembly to reduce the temperature and pressure of the heat exchange medium input into the heat exchange line.

In some embodiments of the utility model, the expansion valve is adhesively attached to the input end of the thermal management assembly to seal an assembly gap between the expansion valve and the input end.

In some embodiments of the utility model, the cell has an electrode surface on which an electrode unit is disposed, and a direction perpendicular to the electrode surface is defined as a height direction H of the cell;

the heat exchange pipeline comprises a plurality of guide pipelines, and the guide pipelines are distributed in a way of being arrayed along the height direction H of the battery cell.

In some embodiments of the utility model, the heat exchange pipeline includes at least one first flow guiding pipe and at least one second flow guiding pipe, the pipe diameter of the first flow guiding pipe is larger than the pipe diameter of the second flow guiding pipe, the extending direction of the first flow guiding pipe is consistent with the extending direction of the second flow guiding pipe, and at least one first flow guiding pipe and at least one second flow guiding pipe are distributed along the height direction H of the battery cell.

In some embodiments of the utility model, the heat management assembly comprises a heat exchange pipe, a main current collecting member and a secondary current collecting member, wherein the main current collecting member and the secondary current collecting member are respectively connected to two ends of the heat exchange pipe, a current collecting input port is arranged on the main current collecting member, the current collecting input port is an input end of the heat management assembly, and the current collecting input port is communicated with the heat exchange pipeline.

In some embodiments of the utility model, the battery cell is a cylindrical battery cell, the heat exchange tube is serpentine, so that the heat exchange surface is curved, and the heat exchange surface is in heat conduction connection with a side surface of the battery cell of the battery pack.

In some embodiments of the utility model, the battery module includes a plurality of heat management assemblies disposed in parallel, and the plurality of heat management assemblies are connected in parallel, a row of battery packs is disposed between two adjacent heat management assemblies, and two opposite sides of each battery pack are in heat conduction connection with the heat exchange surface of the heat management assembly.

In some embodiments of the utility model, the heat exchange medium is R134A or R1234yf.

The utility model also discloses a battery thermal management system, which comprises the battery module.

The utility model also discloses an electric automobile, which comprises the battery thermal management system.

In summary, the battery module, the battery thermal management system and the electric vehicle provided by the utility model have the following technical effects:

the phase change characteristic of the heat exchange medium is skillfully utilized, and meanwhile, a plurality of heat released by the battery cells of the battery pack in the charge and discharge process can be fully and comprehensively absorbed by matching with the circuitous heat exchange pipeline, and the phase change conversion is completed by utilizing the absorbed plurality of heat, so that the problem of low heat exchange efficiency of the conventional heat exchange mode is solved, and the high-rate charge and discharge heat management requirement of a battery system is met. Meanwhile, the problem of liquid impact caused by incomplete phase change of the heat exchange medium is avoided, so that the service lives of the battery thermal management system and the electric automobile are prolonged, and meanwhile, the safety and stability of the battery module, the battery thermal management system and the electric automobile in the use process are guaranteed.

Drawings

Fig. 1 is an overall structure diagram of a battery module according to the present utility model;

FIG. 2 is a schematic view of a thermal management assembly according to the present utility model;

FIG. 3 is a schematic view of a heat exchange tube in the present utility model;

FIG. 4 is an enlarged partial schematic view of FIG. 3A;

fig. 5 is a structural cross-sectional view of a main current collecting member in the present utility model;

fig. 6 is a structural cross-sectional view of the current collecting member according to the present utility model;

FIG. 7 is a schematic diagram of a cell structure according to the present utility model;

fig. 8 is a flow path diagram of a heat exchange medium in the present utility model.

Icon: 11-battery, 111-cell, 1111-electrode face, 1112-electrode unit, 1113-side, 2-thermal management component, 21-heat exchange face, 22-heat exchange line, 221-flow guide line, 23-heat exchange tube, 24-main current collecting member, 241-main current collecting chamber, 242-current collecting input port, 243-current collecting output port, 244-partition baffle, 25-sub current collecting member, 251-sub current collecting chamber, 3-expansion valve.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 1 and 2, the present utility model discloses a battery module, comprising:

at least one row of battery packs 11;

the heat exchange surface 21 of the heat management assembly 2 is connected with the electric core 111 of the battery pack 11, a roundabout heat exchange pipeline 22 is arranged in the heat management assembly 2, and the heat exchange pipeline 22 is filled with heat exchange medium, so that the heat exchange medium exchanges heat with the electric core 111 and the phase state change is completed.

In this embodiment, the battery pack 11 includes a plurality of electric cells 111, the thermal management assembly 2 is located at one side of the battery pack 11, and the electric cells 111 are arranged along the extending direction of the thermal management assembly 2, that is, the arranging direction of the electric cells 111 is consistent with the extending direction of the thermal management assembly 2, the thermal management assembly 2 is connected with the side 1113 of the electric cells 111, when the electric cells 111 of the battery pack 11 generate heat in the use process, the heat is transferred to the heat exchange medium through the heat exchange surface 21 of the thermal management assembly 2, and finally is quickly absorbed by the heat exchange medium, so as to realize the heat exchange effect of the battery pack 11 and the thermal management assembly 2.

As shown in fig. 7, the battery cell 111 has an electrode surface 1111, an electrode unit 1112 is disposed on the electrode surface 1111, and a direction perpendicular to the electrode surface 1111 is defined as a height direction H of the battery cell 111, where the electrode unit 1112 is preferably a positive electrode assembly, may be a negative electrode assembly, or the electrode unit 1112 includes a positive electrode assembly and a negative electrode assembly. The heat exchange pipeline 22 inside the thermal management assembly 2 is detoured along the height direction H of the electric core 111, at this time, after the heat exchange medium is conveyed into the heat exchange pipeline 22 inside the thermal management assembly 2, the heat exchange medium flows along the arrangement direction of the electric cores 111, and during the flowing process of the heat exchange medium, the heat released by part of the electric cores 111 is absorbed and taken away at the same time. Then, the heat exchange medium flows by a certain height along the height direction H of the battery cells 111 under the guidance of the heat exchange pipeline 22, flows back along the arrangement direction of the battery cells 111, absorbs and takes away part of the heat remained by the battery cells 111 again, flows according to the above-mentioned detour path until the reciprocal detour path can reach the side 1113 of the whole covering battery cells 111 along the height direction H of the battery cells 111, so as to achieve the purpose of absorbing the heat released by the battery cells 111 more comprehensively.

It should be noted that the heat exchange medium preferably flows around from bottom to top, so that the heat exchange medium can more fully absorb the heat of the electric core 111, and the utilization rate and the heat exchange rate of the heat exchange medium are improved. Of course, the heat exchange medium may also flow around from top to bottom.

It should also be noted that the heat exchange medium is preferably R134A or R1234yf, the heat exchange medium R134A is tetrafluoroethane, and the medium-low temperature environment-friendly refrigerant has the environment-friendly effect of destroying the ozone layer, and the safety performance of being nonflammable, non-explosive, nontoxic, non-irritating and non-corrosive. In addition, the heat exchange medium R1234yf is tetrafluoropropene, and belongs to an environment-friendly refrigerant with system performance superior to that of R134A. The heat exchange media R134A and R1234yf have good refrigeration effect and stability, and meanwhile, the service life is long, the service stability of the battery module and the battery pack can be ensured, and the heat exchange media R134A and R1234yf also accord with the relevant regulations of the automobile in the aspect of cooling, and can be widely applied to electric automobiles.

In summary, under the cooperation of the heat exchange medium and the circuitous heat exchange pipeline 22, the heat released by each cell 111 of the battery pack 11 can be absorbed more fully and comprehensively, and when the heat exchange medium outputs the heat exchange pipeline 22, the heat exchange medium also completes the phase change process. And the heat of the battery pack 11 is taken away by utilizing the latent heat generated during the phase change of the heat exchange medium to cool the battery pack, so that the heat exchange efficiency is greatly improved compared with a convection heat exchange mode, and the battery module which is charged and discharged at higher multiplying power is favorably kept in a normal or optimal use state.

More importantly, the circuitous heat exchange line 22 better covers each cell 111 of the battery pack 11 and exchanges heat with the cells 111. The characteristic that the temperature is almost unchanged in the phase change process of the heat exchange medium is matched, so that the temperature balance of each cell 111 of the battery pack 11 can be guaranteed to the greatest extent, the temperature difference between the cells 111 is reduced, and the battery module is stably maintained in an optimal working temperature range.

As a preferred mode of the present utility model, the heat exchange surface 21 of the thermal management assembly 2 is provided with a heat conducting glue, and the heat exchange surface 21 is in heat conducting connection with the electric core 111 through the heat conducting glue. Specifically, the connection between the thermal management assembly 2 and the electrical core 111 is more stable by using the viscosity of the heat-conducting adhesive, and meanwhile, defects (such as gaps, holes, recesses, etc.) existing on the heat exchange surface 21 can be filled, so that the contact area between the heat exchange surface 21 and the electrical core 111 is larger. In addition, the heat of the battery cell 111 can be stably transferred to the thermal management assembly 2 by utilizing the good heat conduction property of the heat conduction adhesive, and then the heat is absorbed by the heat exchange medium in the thermal management assembly 2.

As a preferred mode of the present utility model, referring specifically to fig. 1 and 2, the battery module further includes an expansion valve 3, and the expansion valve 3 is assembled and fixed to the thermal management assembly 2 to reduce the temperature and pressure of the heat exchange medium inputted into the heat exchange pipe 22.

Specifically, after flowing through the orifice of the expansion valve 3, the heat exchange medium with relatively high temperature and pressure is converted into an atomized state with low temperature and low pressure by the throttling action of the orifice. In this way, on the one hand, the liquid heat exchange medium entering the heat exchange pipeline 22 can be effectively ensured to be in a low-temperature and low-pressure state, the optimal refrigeration effect is realized, and the heat exchange efficiency of the battery cell 111 is improved.

On the other hand, the flow rate of the heat exchange medium input into the heat exchange pipeline 22 can be effectively controlled, so that the risk that the output heat exchange medium cannot be completely converted into a gaseous state due to overlarge flow rate, the heat exchange medium is conveyed to the compressor to generate liquid impact is avoided, the consumption shortage of the heat exchange medium due to overlarge flow rate is avoided, and the refrigeration effect of the heat management assembly 2 is reduced.

Therefore, the expansion valve 3 is matched with the circuitous heat exchange pipeline 22, so that the output heat exchange medium can be further effectively ensured to complete the phase change conversion, the output heat exchange medium is completely in a gaseous state, the service life of a battery pack applying the battery module and the service life of an electric device using the battery pack are further prolonged, and the service performance of the battery pack and the service performance of the electric device can be further improved.

It should be noted that the expansion valve 3 may be a mechanical thermal expansion valve or an electronic expansion valve. The expansion valve 3 may be an H-type thermal expansion valve or a T-type thermal expansion valve.

As a further aspect of the utility model, the expansion valve 3 is adhesively connected to the input of the thermal management assembly 2. In this way, the expansion valve 3 is installed and fixed on the thermal management assembly 2 by using the viscosity of the colloid, compared with the traditional installation mode adopting bolts, the installation method saves a large number of parts of bolts and reduces the installation procedures of the bolts. Meanwhile, the assembly gap between the expansion valve 3 and the input end is sealed, so that the assembly tightness between the expansion valve 3 and the thermal management assembly 2 is ensured.

As a preferred embodiment of the present utility model, referring to fig. 1 and 2, the heat exchange tube 22 includes a plurality of flow guiding tubes 221, and the plurality of flow guiding tubes 221 are arranged along the height direction H of the battery cell 111.

Specifically, the cross section of the diversion conduit 221 may be circular or square. Each of the guide ducts 221 has the same shape and the same size. The wall of each guide pipe 221 near the cell 111 is defined as a heat exchange wall, and the heat exchange wall is used for performing heat exchange with the cell 111. It should be noted that when the heat exchange pipeline 22 is located between the two rows of battery packs 11, each flow guiding pipe is provided with two heat exchange pipe walls, and the two heat exchange pipe walls are arranged oppositely. The tube wall between two adjacent guide tubes 221 is defined as a supporting tube wall, and the supporting tube wall is used for supporting stress between two heat exchange tube walls, that is, the structural strength of the heat exchange tube 22 is enhanced. In this way, the heat exchange medium is ensured to flow smoothly and smoothly inside each diversion pipeline 221, so that the heat exchange medium and the battery cell 111 can perform stable geothermal exchange. At the same time, the risk that the heat management assembly 2 is deformed or damaged by the extrusion of the two rows of battery packs 11 or the battery packs 11 and 11 components (such as the battery box body) during the assembly process is avoided.

As another preferred mode of the present utility model, the heat exchange pipeline 22 includes at least one first flow guiding pipe and at least one second flow guiding pipe, the pipe diameter of the first flow guiding pipe is larger than the pipe diameter of the second flow guiding pipe, where the pipe diameter refers to the length of the first flow guiding pipe and the second flow guiding pipe along the height direction H of the electrical core 111, that is, the cross-sectional area of the first flow guiding pipe is larger than the cross-sectional area of the second flow guiding pipe, the extending direction of the first flow guiding pipe is consistent with the extending direction of the second flow guiding pipe, and at least one first flow guiding pipe and at least one second flow guiding pipe are arranged and distributed along the height direction H of the electrical core 111.

Specifically, the cross-sectional shape of the first flow guide tube and the cross-sectional shape of the second flow guide tube may be rectangular, or elliptical, or in the shape of a waist-shaped hole. In this way, the heat exchange medium can be ensured to flow smoothly and smoothly inside each diversion pipeline 221, so that the heat exchange medium and the battery cell 111 can perform stable geothermal exchange. The risk of deformation or pressure loss of the heat exchange line 22 by the compression of the two rows of battery packs 11 or between the battery packs 11 and 11 components during assembly of the thermal management assembly 2 is also avoided. As a preferred mode of the present utility model, referring to fig. 2 to 6, the thermal management assembly 2 includes a heat exchange tube 23, a primary current collecting member 24 and a secondary current collecting member 25, wherein the primary current collecting member 24 and the secondary current collecting member 25 are respectively connected to two ends of the heat exchange tube 23, a current collecting input port 242 is disposed on the primary current collecting member 24, the current collecting input port 242 is an input end of the thermal management assembly 2, and the current collecting input port 242 is in communication with the heat exchange tube 22.

Specifically, the main current collecting member 24 is further provided with a current collecting output port 243, wherein the current collecting output port 243 is an output end of the thermal management assembly 2, and then the heat exchange medium is input into the heat exchange pipeline 22 from the expansion valve 3 of the current collecting input port 242, flows along the extending path of the heat exchange pipeline 22, exchanges heat with the battery cell 111, and finally is output from the current collecting output port 243.

The main collecting member 24 is provided with a main collecting chamber 241 inside, and a separation baffle 244 is further provided in the main collecting chamber 241, and the separation baffle 244 is located between the collecting output 243 and the collecting input 242, so that the main collecting chamber 241 is separated into a collecting output cavity communicating with the collecting output 243 and a collecting input cavity communicating with the collecting input 242, and the collecting output cavity and the collecting input cavity are independent from each other. A secondary flow collecting chamber 251 is arranged in the secondary flow collecting member 25, a plurality of flow guiding pipelines 221 are arranged in the heat exchange pipe fitting 23, the flow guiding pipelines 221 communicated with the flow collecting output cavity are defined as flow guiding output pipes, the flow guiding pipelines 221 communicated with the flow collecting input cavity are flow guiding input pipes, and then the flow collecting input cavity, the flow guiding input pipes, the secondary flow collecting chamber 251, the flow guiding output pipes and the flow collecting output cavity sequentially form a roundabout heat exchange pipeline 22.

At this time, the heat exchange medium is throttled by the expansion valve 3 and then is input into the manifold input cavity, and under the blocking effect of the partition baffle 244, the heat exchange medium does not flow into the manifold output cavity, but is guided to the guiding input pipe, flows to the slave manifold chamber 251 along the guiding input pipe, flows to the guiding output pipe under the buffering and guiding effects of the slave manifold chamber 251, and is conveyed to the manifold output cavity along the guiding output pipe, and finally, the thermal management assembly 2 is output from the manifold output port 243.

It should be noted that, depending on the number of turns of the heat exchange line 22, the number of dividing baffles 244 provided in the main collecting chamber 241 may be two, three, four, etc., and a plurality of dividing baffles 244 are provided in parallel, and each of the plurality of dividing baffles 244 is located between the collecting output 243 and the collecting input 242, and two adjacent dividing baffles 244 divide the main collecting chamber 241 to form a first transition chamber. Further, a plurality of drainage baffles are arranged in parallel, and the plurality of drainage baffles are separated from the collecting chamber 251 to form a plurality of second transition chambers. Defining the diversion pipeline 221 communicated with the first transition cavity as a transition conveying pipe, and connecting and communicating the first transition cavity with the second transition cavity through the transition conveying pipe.

It should be further noted that, when the heat exchange tube 23 is provided with the first flow guide pipe and the second flow guide pipe, the bypass heat exchange tube 22 can also be formed by matching the first flow guide pipe, the second flow guide pipe, the manifold input cavity, the manifold cavity 251 and the manifold output cavity, and the communication manner and the flow path of the heat exchange medium are referred to the above flow guide pipe 221, which is not repeated here. The manifold input cavity can be provided with a first flow guide pipe and a second flow guide pipe, or the manifold input cavity can be provided with a first flow guide pipe and two second flow guide pipes, or the manifold input cavity can be provided with two first flow guide pipes and a second flow guide pipe, and the number ratio of the first flow guide pipe to the second flow guide pipe can be adjusted according to the actual structural design.

As a preferred mode of the present utility model, referring to fig. 1, 2 and 3, the battery cell 111 is a cylindrical battery cell 111, the heat exchange tube 23 is serpentine, so that the heat exchange surface 21 is curved, and the heat exchange surface 21 is thermally connected to the side 1113 of the battery cell 111 of the battery pack 11. In this way, the contact area between the heat exchange surface 21 and the side 1113 of the battery cell 111 is increased, so that heat generated by the battery cell 111 can be fully absorbed by the heat exchange medium in the heat exchange pipe fitting 23, the cooling effect of the battery cell 111 is ensured, and the risk of thermal runaway of the battery pack 11 is effectively avoided.

As a preferred mode of the present utility model, as shown in fig. 1, the battery module includes a plurality of heat management assemblies 2 arranged in parallel, and the plurality of heat management assemblies 2 are connected in parallel, a row of battery packs 11 is disposed between two adjacent heat management assemblies 2, and two opposite sides of each battery pack 11 are in heat conduction connection with the heat exchange surface 21 of the heat management assembly 2.

By the arrangement, the battery cells 111 can uniformly dissipate heat to the heat-exchanging surfaces 21 on opposite sides, so that the purpose of balanced heat dissipation is achieved, the heat dissipation efficiency of each row of battery PACKs 11 is improved, the optimal use state of each row of battery PACKs 11 is ensured, the occupied space of the battery module can be effectively reduced, and the space inside the battery PACK occupied by the thermal management assembly 2 is effectively saved.

In addition, when the heat management components 2 are connected in parallel and the heat exchange medium is supplied by external conveying, the heat management components 2 are filled with the heat exchange medium at the same time, so that the flow dividing effect is achieved, the purpose of uniform supply of the heat exchange medium is ensured, and the unexpected effect of reducing the flow resistance of the liquid cooling system is achieved.

Second embodiment

Based on the above disclosed battery module, the inventors also disclose a battery thermal management system using the above battery module.

In this embodiment, the battery thermal management system includes a compressor and a condensing unit, where the condensing unit may be a condenser or a heat exchanger. The expansion valve 3 of the battery module is communicated with the output end of the condensing part through a first pipeline, the input end of the condensing part is communicated with the output end of the compressor through a second pipeline, and the input end of the compressor is communicated with the current collecting output port 243 of the battery module through a third pipeline.

In this way, the compressor is used as a power source of the battery thermal management system, the heat exchange medium in a low-pressure gas state is compressed to form a high-pressure gas state and is conveyed to the condensing part, the condensing part condenses the heat exchange medium in the high-pressure gas state to form a high-pressure liquid state and is conveyed to the battery module, when the heat exchange medium flows through the expansion valve 3 of the battery module, the high-pressure liquid state heat exchange medium is changed into a low-pressure liquid state through the throttling and depressurization function of the expansion valve 3 so as to better cool the battery pack 11, the battery pack 11 is regulated to be in an optimal temperature range, and the heat exchange medium is evaporated to form a low-pressure gas state after absorbing a large amount of heat and is conveyed back to the compressor.

In summary, the battery thermal management system can realize the purpose of self-circulation cooling with few pumps or no pumps, and compared with the traditional thermal management mode, the battery thermal management system reduces the use of parts such as a water pump, a battery cooler, a cooling liquid pipeline and the like, and realizes the effects of energy conservation and environmental protection. Meanwhile, the phase change characteristic of the heat exchange medium is matched, so that the heat management efficiency of the battery heat management system and the electric device is further improved, and the temperature uniformity in the battery pack is further effectively ensured.

Third embodiment

The inventor also discloses an electric automobile, including above-mentioned battery package.

Specifically, the heat management assembly 2 can fully absorb the heat of each cell 111 of the battery module, so that the battery module and the battery pack are always in the optimal use state, and stable power supply is provided for the electric automobile. And a large amount of heat can be fully changed into overheated gas phase after being fully absorbed by the heat exchange medium, so that the liquid impact risk of the compressor of the electric automobile is reduced, the energy consumption ratio of the electric automobile is reduced, and the cruising ability, the safety performance and the service life of the electric automobile are improved. Meanwhile, the weight of the electric automobile can be reduced, and the purpose of light weight design of the electric automobile is achieved.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (12)

1. A battery module, comprising:

at least one row of battery packs (11);

the battery pack comprises a battery pack (11) and a heat management assembly (2), wherein a heat exchange surface (21) of the heat management assembly (2) is connected with a battery cell (111) of the battery pack (11), a roundabout heat exchange pipeline (22) is arranged in the heat management assembly (2), and a heat exchange medium is filled in the heat exchange pipeline (22) so that the heat exchange medium exchanges heat with the battery cell (111) and changes in phase state.

2. The battery module according to claim 1, wherein: the heat exchange surface (21) of the heat management assembly (2) is provided with heat conducting glue, and the heat exchange surface (21) is in heat conducting connection with the battery cell (111) through the heat conducting glue.

3. The battery module according to claim 1, wherein: and the expansion valve (3) is assembled and fixed on the thermal management assembly (2), so that the temperature and the pressure of the heat exchange medium input into the heat exchange pipeline (22) are reduced.

4. The battery module according to claim 3, wherein: the expansion valve (3) is adhesively connected to the input of the thermal management assembly (2).

5. The battery module according to claim 1, wherein: the battery cell (111) is provided with an electrode surface (1111), an electrode unit (1112) is arranged on the electrode surface (1111), and a direction perpendicular to the electrode surface (1111) is defined as a height direction H of the battery cell (111);

the heat exchange pipeline (22) comprises a plurality of guide pipelines (221), and the guide pipelines (221) are distributed in an arrangement mode along the height direction H of the battery cell (111).

6. The battery module according to claim 1, wherein: the heat exchange pipeline (22) comprises at least one first guide pipe and at least one second guide pipe, the pipe diameter of the first guide pipe is larger than that of the second guide pipe, the extending direction of the first guide pipe is consistent with that of the second guide pipe, and at least one first guide pipe and at least one second guide pipe are distributed in an arrangement mode along the height direction H of the battery cell (111).

7. The battery module according to any one of claims 1 to 6, wherein: the heat management assembly (2) comprises a heat exchange pipe fitting (23), a main current collecting component (24) and a secondary current collecting component (25), wherein the main current collecting component (24) and the secondary current collecting component (25) are respectively connected to two ends of the heat exchange pipe fitting (23), a current collecting input port (242) is arranged on the main current collecting component (24), the current collecting input port (242) is an input end of the heat management assembly (2), and the current collecting input port (242) is communicated with the heat exchange pipeline (22).

8. The battery module according to claim 7, wherein: the battery cell (111) is a cylindrical battery cell (111), the heat exchange pipe fitting (23) is in a serpentine shape, so that the heat exchange surface (21) is in a curved surface shape, and the heat exchange surface (21) is in heat conduction connection with the side surface (1113) of the battery cell (111) of the battery pack (11).

9. The battery module according to any one of claims 1 to 6, wherein: the solar heat management system comprises a plurality of heat management assemblies (2) which are arranged in parallel, wherein the plurality of heat management assemblies (2) are connected in parallel, a row of battery packs (11) is arranged between every two adjacent heat management assemblies (2), and two opposite sides of each battery pack (11) are in heat conduction connection with a heat exchange surface (21) of each heat management assembly (2).

10. The battery module according to claim 1 or 2 or 3 or 4, wherein: the heat exchange medium is R134A or R1234yf.

11. A battery thermal management system, characterized by: comprising a battery module according to any one of claims 1 to 10.

12. An electric automobile, characterized in that: comprising the battery thermal management system of claim 11.