Thermal management system and battery pack

Abstract

The utility model provides a thermal management system and a battery pack. The heat management system comprises a first heat exchange assembly, the first heat exchange assembly comprises at least one liquid inlet pipeline and at least one liquid outlet pipeline, and the liquid inlet pipeline and the liquid outlet pipeline are respectively communicated with the interior of a battery of the battery pack, so that electrolyte can enter the battery from the liquid inlet pipeline and is discharged to the liquid outlet pipeline from the battery. The battery heat management system solves the problems that in the prior art, a battery heat management system is poor in heat exchange effect, and heat exchange is difficult to directly conduct on an electrode assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically, relate to a kind of thermal management system and battery pack. BACKGROUND

[0002] With the development of electric vehicles and the continuous improvement of power system power, the density of battery pack is also increased more than ever, and the demand for fast charging and discharging leads to more heat generated by the battery during high-current charging and discharging. If not cooled in time, the heat continues to accumulate in the battery module, which will cause the battery module to rise and spread unevenly. The internal chemical composition of the battery has poor heat resistance, so it will accelerate the reaction at high temperature, causing the internal structure of the battery to change in quality, and ultimately causing serious safety consequences. At the same time, the battery is not suitable for working in low temperature environment, and low temperature will reduce the activity of the battery. Therefore, an efficient thermal management system is needed to ensure that the battery is within a safe temperature range to prolong the service life of the battery and safety.

[0003] The current thermal management system of square battery on the market is mostly indirect heat exchange through the battery shell, but there is still a gap between the electrode assembly and the battery shell, which will inevitably hinder heat transfer. Especially under the condition of high-rate charging and discharging, the heat accumulated in the battery in a short time is high, and the conventional liquid cooling system also cools the battery shell first and then conducts to the electrode assembly, which is inevitably slower than directly cooling the electrode assembly. At low temperature, the liquid heating system also needs to heat the battery shell first and then transfer the heat to the electrode assembly inside.

[0004] Therefore, the existing battery thermal management system has the problems of poor heat exchange effect and difficulty in directly exchanging heat with the electrode assembly. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a thermal management system and a battery pack to solve the problem of poor heat exchange effect of the battery thermal management system in the prior art and the difficulty in directly exchanging heat with the electrode assembly.

[0006] In order to achieve the above purpose, according to one aspect of the utility model, a thermal management system is provided, which comprises: a first heat exchange assembly, the first heat exchange assembly comprises at least one liquid inlet pipe and at least one liquid outlet pipe, the liquid inlet pipe and the liquid outlet pipe are respectively communicated with the inside of the battery of the battery pack, so that the electrolyte can enter the battery from the liquid inlet pipe and be discharged from the battery to the liquid outlet pipe.

[0007] Further, the number of liquid inlet pipes and the number of liquid outlet pipes are equal and one-to-one corresponding, and the corresponding liquid inlet pipe and liquid outlet pipe are communicated with the same battery.

[0008] Further, the liquid inlet pipe and the liquid outlet pipe corresponding to each other are communicated with two ends of the length direction of the corresponding battery respectively; and / or the liquid inlet pipe and the liquid outlet pipe corresponding to each other are communicated with two ends of one diagonal of the corresponding battery respectively; and / or the liquid inlet pipe and the liquid outlet pipe corresponding to each other are communicated with the top surface of the corresponding battery respectively; and / or the pipe diameters of the liquid inlet pipe and the liquid outlet pipe corresponding to each other are the same.

[0009] Further, the liquid inlet pipe is multiple, and the multiple liquid inlet pipes are arranged at equal intervals along the length direction of the battery pack; and / or the liquid outlet pipe is multiple, and the multiple liquid outlet pipes are arranged at equal intervals along the length direction of the battery pack.

[0010] Further, the first heat exchange assembly further comprises a liquid inlet main pipe and a liquid outlet main pipe communicated with each other, one end of the liquid inlet pipe away from the battery is communicated with the liquid inlet main pipe, and one end of the liquid outlet pipe away from the battery is communicated with the liquid outlet main pipe.

[0011] Further, in the flow path of the electrolyte, in any two adjacent liquid inlet pipes and / or any two adjacent liquid outlet pipes, the pipe diameter of one closer to the connection between the liquid inlet main pipe and the liquid outlet main pipe is smaller than the pipe diameter of one farther away from the connection between the liquid inlet main pipe and the liquid outlet main pipe.

[0012] Further, the heat management system further comprises a driving pump, the liquid inlet main pipe and the liquid outlet main pipe are communicated through the driving pump; and / or at least one liquid supplementing port is arranged on the liquid inlet main pipe and / or the liquid outlet main pipe.

[0013] Further, the heat management system further comprises a second heat exchange assembly, at least a part of the second heat exchange assembly is arranged on the outer surface of the battery, and the second heat exchange assembly exchanges heat with the first heat exchange assembly and / or the battery.

[0014] Further, the second heat exchange assembly comprises at least two side cold plates, the two side cold plates are arranged on the two sides of the battery oppositely, and at least a part of the liquid inlet main pipe and at least a part of the liquid outlet main pipe are arranged on the side of the side cold plate away from the battery corresponding to different side cold plates.

[0015] According to another aspect of the utility model, a battery pack is provided, which comprises the heat management system.

[0016] According to the technical scheme of the utility model, the heat management system in the application comprises a first heat exchange assembly and a second heat exchange assembly, the first heat exchange assembly comprises at least one liquid inlet pipe and at least one liquid outlet pipe, the liquid inlet pipe and the liquid outlet pipe are communicated with the inside of the battery of the battery pack respectively, so that the electrolyte can enter the battery from the liquid inlet pipe and be discharged from the battery to the liquid outlet pipe, at least a part of the second heat exchange assembly is arranged on the outer surface of the battery, and the second heat exchange assembly exchanges heat with the first heat exchange assembly and / or the battery.

[0017] When the heat management system in the present application is used, since the heat management system has the first heat exchange assembly, and the first heat exchange assembly has at least one liquid inlet pipeline and at least one liquid outlet pipeline, the heat management system can realize circulation of the electrolyte in the battery through the first heat exchange assembly, that is, the electrolyte can be discharged from the battery through the liquid outlet pipeline and re-enter the inside of the battery through the liquid inlet pipeline. Therefore, in the present application, through circulation of the electrolyte between the first heat exchange assembly and the battery, heat release or heat absorption of the electrolyte can be realized, and heat exchange of the electrode assembly through the electrolyte can be realized, so that the heat exchange effect on the electrode assembly can be improved. Compared with the prior art in which heat exchange of the outer surface of the battery is used to realize heat exchange of the electrolyte and the electrode assembly in the battery, the heat exchange effect of the heat management system in the present application is better. Therefore, the heat management system in the present application effectively solves the problem of poor heat exchange effect of the battery heat management system and difficulty in directly heat exchanging the electrode assembly in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof serve to explain the present application. The present application is not intended to be unduly limited by such exemplary embodiments.

[0019] Fig. 1 A schematic view of the position relationship between the heat management system and the battery according to one specific embodiment of the present application is shown.

[0020] Fig. 2 A schematic view of the position relationship between the second heat exchange assembly of the heat management system and the battery according to one specific embodiment of the present application is shown.

[0021] Fig. 3 A schematic view of the position relationship between the first heat exchange assembly of the heat management system and the driving pump according to one specific embodiment of the present application is shown.

[0022] Among them, the above drawings include the following reference signs:

[0023] 10, first heat exchange assembly; 11, liquid inlet pipeline; 12, liquid outlet pipeline; 13, liquid inlet main pipeline; 14, liquid outlet main pipeline; 20, battery; 30, second heat exchange assembly; 40, driving pump; 50, liquid supplement port. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0026] In the utility model, in the case that no opposite statement is made, the orientation words such as "upper, lower, top, bottom" used are generally for the direction shown in the drawing, or for the vertical, perpendicular or gravity direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner, outer relative to the contour of each component itself, but the above orientation words are not used to limit the utility model.

[0027] In order to solve the problem that the heat exchange effect of the battery thermal management system is poor and it is difficult to directly heat exchange the electrode assembly in the prior art, a thermal management system and a battery pack are provided.

[0028] And the battery pack in the application has the following thermal management system.

[0029] The thermal management system in the application comprises a first heat exchange assembly 10, the first heat exchange assembly 10 comprises at least one liquid inlet pipeline 11 and at least one liquid outlet pipeline 12, and the liquid inlet pipeline 11 and the liquid outlet pipeline 12 are respectively communicated with the inside of the battery 20 of the battery pack, so that the electrolyte can enter the battery 20 from the liquid inlet pipeline 11 and be discharged from the battery 20 to the liquid outlet pipeline 12.

[0030] The thermal management system in the application further comprises a second heat exchange assembly 30, at least a part of the second heat exchange assembly 30 is arranged on the outer surface of the battery 20, and the second heat exchange assembly 30 exchanges heat with the first heat exchange assembly 10 and / or the battery 20.

[0031] As Figs. 1 to 3As shown, when the thermal management system in the present application is used, since the first heat exchange assembly 10 is provided and the first heat exchange assembly 10 has at least one liquid inlet pipeline 11 and at least one liquid outlet pipeline 12, the thermal management system can realize the circulation of the electrolyte in the battery 20 through the first heat exchange assembly 10, that is, the electrolyte can be discharged from the battery 20 through the liquid outlet pipeline 12 and re-enter the inside of the battery 20 through the liquid inlet pipeline 11. Therefore, in the present application, the heat release or absorption of the electrolyte and the heat exchange of the electrode assembly by the electrolyte can be realized through the circulation of the electrolyte between the first heat exchange assembly 10 and the battery 20, so that the heat exchange effect of the electrode assembly can be improved. Compared with the prior art, the heat exchange effect of the thermal management system in the present application is better, which realizes the heat exchange of the electrolyte and the electrode assembly in the battery 20 through the heat exchange of the outer surface of the battery 20. Further, since the thermal management system in the present application also has the second heat exchange assembly 30, and the second heat exchange assembly 30 can exchange heat with the first heat exchange assembly 10, in the present application, the cooling and heating of the electrolyte by the first heat exchange assembly 10 can be improved through the heat exchange between the second heat exchange assembly 30 and the first heat exchange assembly 10, so that the cooled electrolyte can cool the electrode assembly or the heated electrolyte can heat the electrode assembly. Therefore, the thermal management system in the present application effectively solves the problem of poor heat exchange effect of the battery thermal management system and the difficulty of directly heat exchanging the electrode assembly in the prior art.

[0032] It should be noted that in the present application, when the second heat exchange assembly 30 is not used to heat exchange the first heat exchange assembly 10, other heat exchange devices can be added to heat exchange the first heat exchange assembly 10, so as to realize the cooling or heating of the electrolyte. At the same time, in the present application, generally, when the battery pack is applied in a low temperature environment, the electrolyte is heated, and generally, the electrolyte is cooled.

[0033] Optionally, the number of the liquid inlet pipes 11 and the number of the liquid outlet pipes 12 are equal and one-to-one corresponding, and the corresponding liquid inlet pipe 11 and the corresponding liquid outlet pipe 12 are both in communication with the same battery 20. In the present application, for the same battery 20 in the battery pack, generally one liquid inlet pipe 11 and one liquid outlet pipe 12 are corresponding, so as to realize the circulation of the electrolyte among the liquid inlet pipe 11, the battery 20 and the liquid outlet pipe 12. Of course, according to the actual use and design, the number relationship among the battery 20, the liquid inlet pipe 11 and the liquid outlet pipe 12 can be adjusted adaptively, that is, one battery 20 corresponds to multiple liquid inlet pipes 11 and multiple liquid outlet pipes 12, or one battery 20 corresponds to multiple liquid inlet pipes 11 and one liquid outlet pipe 12, or one battery 20 corresponds to one liquid inlet pipe 11 and multiple liquid outlet pipes 12. However, it should be noted that each battery 20 of the battery pack needs to be provided with a liquid inlet pipe 11 and a liquid outlet pipe 12, instead of only one of the liquid inlet pipe 11 and the liquid outlet pipe 12.

[0034] Preferably, the number of the batteries 20, the number of the liquid inlet pipes 11 and the number of the liquid outlet pipes 12 are equal and one-to-one corresponding.

[0035] Optionally, the corresponding liquid inlet pipe 11 and the corresponding liquid outlet pipe 12 are respectively in communication with both ends of the length direction of the corresponding battery 20.

[0036] Optionally, the corresponding liquid inlet pipe 11 and the corresponding liquid outlet pipe 12 are respectively in communication with both ends of one diagonal line of the corresponding battery 20.

[0037] Optionally, the corresponding liquid inlet pipe 11 and the corresponding liquid outlet pipe 12 are respectively in communication with the top surface of the corresponding battery 20.

[0038] For the above-mentioned arrangement, from the aspect of use performance, it is mainly to ensure that the electrolyte in the battery 20 can be more fully circulated, so as to ensure the cooling effect of the electrode assembly and ensure that the internal temperature of the battery 20 is more uniform. From the internal structure of the battery pack, it is mainly to reasonably utilize the internal structure of the battery pack, so as to realize the miniaturization design of the battery pack and reduce the space occupied by the battery pack. Of course, for the connection position of the liquid inlet pipe 11 and the liquid outlet pipe 12 with the battery 20, it can be adaptively adjusted according to the actual design requirement.

[0039] Optionally, the pipe diameter of the liquid inlet pipe 11 and the liquid outlet pipe 12 corresponding to each other is the same. When the battery 20 corresponds to the liquid inlet pipe 11 and the liquid outlet pipe 12 one by one, by such arrangement, it can be ensured that the electrolyte in the battery 20 is in a state of dynamic balance, or in other words, the electrolyte in the battery 20 will not increase or decrease at a certain time, thereby effectively ensuring the use performance of the battery 20 and will not affect the service life of the battery 20.

[0040] Preferably, the end of the liquid inlet pipe 11 communicated with the battery 20 and the end of the liquid outlet pipe 12 communicated with the battery 20 extend into the interior of the battery 20 from the top of the battery 20 and extend towards the bottom surface of the battery 20. By such arrangement, it can be ensured that the electrolyte in the battery 20 can participate in the circulation among the liquid inlet pipe 11, the battery 20 and the liquid outlet pipe 12 as much as possible, thereby ensuring the use performance of the thermal management system.

[0041] Optionally, the liquid inlet pipe 11 is a plurality of liquid inlet pipes 11, and the plurality of liquid inlet pipes 11 are arranged equidistantly along the length direction of the battery pack; the liquid outlet pipe 12 is a plurality of liquid outlet pipes 12, and the plurality of liquid outlet pipes 12 are arranged equidistantly along the length direction of the battery pack. By such arrangement, it can be ensured that the overall structure of the thermal management system is more regular, thereby reducing the internal space of the battery pack occupied by the thermal management system.

[0042] In one specific embodiment of the present application, the liquid inlet pipe 11 and the liquid outlet pipe 12 corresponding to each other are communicated with the two ends of the length direction of the corresponding battery 20 respectively. And the liquid inlet pipe 11 and the liquid outlet pipe 12 corresponding to each other are communicated with the two ends of one diagonal line of the corresponding battery 20 respectively. At the same time, the liquid inlet pipe 11 and the liquid outlet pipe 12 corresponding to each other are communicated with the top surface of the corresponding battery 20 respectively. That is, the liquid inlet pipe 11 and the liquid outlet pipe 12 are arranged at the two ends of one diagonal line of the top surface of the battery 20 respectively. And after the liquid inlet pipe 11 and the liquid outlet pipe 12 enter the interior of the battery 20 from the top surface of the battery 20 respectively, they continue to extend towards the bottom surface of the battery 20 and have an electrolyte flowing gap between the bottom inner surface of the battery 20.

[0043] In one specific embodiment of the present application, the first heat exchange assembly 10 further comprises a liquid inlet main pipe 13 and a liquid outlet main pipe 14 communicated with each other, and the end of the liquid inlet pipe 11 away from the battery 20 is communicated with the liquid inlet main pipe 13, and the end of the liquid outlet pipe 12 away from the battery 20 is communicated with the liquid outlet main pipe 14. That is, in the present application, the electrolyte can enter different liquid inlet pipes 11 through the liquid inlet main pipe 13, and then enter different batteries 20. At the same time, for different batteries 20, the electrolyte in the interior thereof enters the liquid outlet main pipe 14 through different liquid outlet pipes 12, and then enters the liquid inlet main pipe 13 from the liquid outlet main pipe 14, thereby realizing the circulation of the electrolyte between the first heat exchange assembly 10 and different batteries 20.

[0044] Optionally, in the flow path of the electrolyte, the pipe diameter of one of any two adjacent liquid inlet pipes 11 and / or any two adjacent liquid outlet pipes 12 closer to the connection between the liquid inlet main pipe 13 and the liquid outlet main pipe 14 is smaller than the pipe diameter of one of any two adjacent liquid inlet pipes 11 and / or any two adjacent liquid outlet pipes 12 farther away from the connection between the liquid inlet main pipe 13 and the liquid outlet main pipe 14. That is, for different liquid inlet pipes 11, the farther the liquid inlet pipe 11 is from the end of the liquid inlet main pipe 13 connected to the liquid outlet main pipe 14 in the length direction of the liquid inlet main pipe 13, the larger the diameter of the liquid inlet pipe 11. And for different liquid outlet pipes 12, the farther the liquid inlet pipe 11 is from the end of the liquid inlet main pipe 13 connected to the liquid outlet main pipe 14 in the length direction of the liquid outlet main pipe 14, the larger the diameter of the liquid inlet pipe 11. In the present application, since the plurality of liquid inlet pipes 11 and the liquid inlet main pipe 13, and the plurality of liquid outlet pipes 12 and the liquid outlet main pipe 14 are in a parallel relationship, the above-mentioned setting mode can improve the uniformity of the electrolyte flow, thereby ensuring that the flow of electrolyte into or out of each battery 20 is the same, and further ensuring that the temperature between different batteries 20 is more uniform, to ensure the use performance and service life of the battery pack.

[0045] Optionally, as shown in Fig. 3 The heat management system further comprises a driving pump 40, and the liquid inlet main pipe 13 and the liquid outlet main pipe 14 are communicated through the driving pump 40. By such a setting, it can be ensured that the circulation of the electrolyte between the battery 20 and the first heat exchange assembly 10 is smoother, thereby ensuring the use performance of the heat management system.

[0046] Optionally, as shown in Fig. 3 The liquid inlet main pipe 13 and / or the liquid outlet main pipe 14 is provided with at least one liquid supplement port 50. After the battery 20 is used for a period of time, the electrolyte of the battery 20 will be consumed, and the decrease of the electrolyte will cause the electrochemical performance of the battery 20 to decrease and the service life to attenuate, so that the liquid supplement port 50 is provided to supplement the electrolyte to the battery 20 through the liquid supplement port 50, thereby improving the service life of the battery 20.

[0047] Optionally, the second heat exchange assembly 30 comprises at least two side cold plates, the two side cold plates are oppositely arranged on two sides of the battery 20, and at least a part of the liquid inlet main pipe 13 and at least a part of the liquid outlet main pipe 14 are arranged on the side of the side cold plate away from the battery 20 corresponding to different side cold plates. And in one specific embodiment of the present application, the liquid inlet main pipe 13 and the liquid outlet main pipe 14 respectively have a U-shaped pipe segment adhered to the corresponding side cold plate through a heat-conducting adhesive, thereby prolonging the flow path of the liquid inlet main pipe 13 and the liquid outlet main pipe 14 and the contact area with the side cold plate, and further improving the heat exchange effect of the electrolyte.

[0048] Of course, the second heat exchange assembly 30 in the application can also include a bottom surface cold plate arranged at the bottom of the battery 20.

[0049] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0050] 1. Effectively solve the problem of poor heat exchange effect of the battery thermal management system in the prior art, and the problem of difficult direct heat exchange of the electrode assembly.

[0051] 2. Simple structure and stable performance.

[0052] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the utility model.

[0053] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0054] It should be noted that the terms "first", "second" and the like in the specification and claims of the application and the above-described drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein.

[0055] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A thermal management system, characterized by, The heat management system comprises: a first heat exchange assembly (10) comprising at least one liquid inlet pipe (11) and at least one liquid outlet pipe (12), the liquid inlet pipe (11) and the liquid outlet pipe (12) being respectively communicated with the inside of a battery (20) of a battery pack, so that the electrolyte can enter the battery (20) from the liquid inlet pipe (11) and be discharged from the battery (20) to the liquid outlet pipe (12).

2. The thermal management system of claim 1, wherein, The number of the liquid inlet pipes (11) and the number of the liquid outlet pipes (12) are equal and one-to-one corresponding, and the corresponding liquid inlet pipe (11) and the corresponding liquid outlet pipe (12) are both communicated with the same battery (20).

3. The heat management system according to claim 2, wherein the corresponding liquid inlet pipe (11) and the corresponding liquid outlet pipe (12) are respectively communicated with two ends of the length direction of the corresponding battery (20); and / or the corresponding liquid inlet pipe (11) and the corresponding liquid outlet pipe (12) are respectively communicated with two ends of one diagonal line of the corresponding battery (20); and / or the corresponding liquid inlet pipe (11) and the corresponding liquid outlet pipe (12) are respectively communicated with the top surface of the corresponding battery (20); and / or the pipe diameters of the corresponding liquid inlet pipe (11) and the corresponding liquid outlet pipe (12) are the same.

4. The heat management system according to claim 1, wherein the liquid inlet pipes (11) are multiple, and the multiple liquid inlet pipes (11) are arranged at equal intervals along the length direction of the battery pack; and / or the liquid outlet pipes (12) are multiple, and the multiple liquid outlet pipes (12) are arranged at equal intervals along the length direction of the battery pack.

5. The thermal management system of any one of claims 1 to 4, wherein, The first heat exchange assembly (10) further comprises a liquid inlet main pipe (13) and a liquid outlet main pipe (14) communicated with each other, one end of the liquid inlet pipe (11) away from the battery (20) is communicated with the liquid inlet main pipe (13), and one end of the liquid outlet pipe (12) away from the battery (20) is communicated with the liquid outlet main pipe (14).

6. The thermal management system of claim 5, wherein, In the flow path of the electrolyte, in any two adjacent liquid inlet pipes (11) and / or any two adjacent liquid outlet pipes (12), the pipe diameter of one closer to the connection between the liquid inlet main pipe (13) and the liquid outlet main pipe (14) is smaller than the pipe diameter of the other farther away from the connection between the liquid inlet main pipe (13) and the liquid outlet main pipe (14).

7. The heat management system according to claim 5, wherein the heat management system further comprises a driving pump (40), the liquid inlet main pipe (13) and the liquid outlet main pipe (14) are communicated through the driving pump (40); and / or at least one liquid supplementing port (50) is arranged on the liquid inlet main pipe (13) and / or the liquid outlet main pipe (14).

8. The thermal management system of claim 5, wherein, The heat management system further comprises a second heat exchange assembly (30), at least a part of the second heat exchange assembly (30) is arranged on an outer surface of the battery (20), and the second heat exchange assembly (30) exchanges heat with the first heat exchange assembly (10) and / or the battery (20).

9. The thermal management system of claim 8, wherein, The second heat exchange assembly (30) comprises at least two side cold plates, two side cold plates are arranged oppositely on two sides of the battery (20), and at least a part of the liquid inlet main pipeline (13) and at least a part of the liquid outlet main pipeline (14) are arranged on a side of the side cold plate away from the battery (20) respectively.

10. A battery pack, characterized by, The heat management system comprises any one of claims 1 to 9.

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