Thermal management system and power battery

Abstract

The utility model relates to the technical field of batteries, in particular to a thermal management system and a power battery, and the thermal management system comprises a strip-shaped temperature adjusting component which is internally provided with a temperature adjusting working medium; the number of the temperature conducting components is multiple, and the multiple temperature conducting components are sequentially arranged in the length direction of the temperature adjusting component; each temperature conducting component is provided with a coating part, and the coating part is in contact with at least one wall surface of the temperature adjusting component; the temperature conducting component is in contact with the battery cell, and the temperature of the temperature adjusting working medium can be transmitted to the battery cell through the temperature conducting component to adjust the temperature of the battery cell. According to the thermal management system provided by the invention, the combination of the heat pipe and the conventional cooling pipeline is utilized, so that the temperature regulation requirements of cooling and heating of the battery system are efficiently met, the thermal uniformity is improved, and the number of joints of the heat pipe and the cooling pipeline is greatly reduced, so that the working life of the thermal management system is effectively ensured; and the probability and risk of leakage of the temperature adjusting working medium are reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a thermal management system and a power battery. Background Art

[0002] At present, the thermal management systems of existing battery systems mostly use flat tube cooling. The connection of multiple flat tubes requires multiple brazing or plug-in connections, and there is a certain degree of leakage risk at the welding positions and plug-in connection positions.

[0003] In the industrial and electronic fields, heat pipes are used for cooling. Heat pipes are a highly efficient heat transfer element, also known as "thermal superconductors". They transfer heat through the evaporation and condensation of the working fluid in the pipe. They have extremely high thermal conductivity, which can exceed that of metal materials such as copper and aluminum. However, the solution using heat pipes still has a large number of welding positions and joint positions, and there is a high risk of working fluid leakage. Utility Model Content

[0004] The purpose of the present application is to provide a thermal management system and a power battery, so as to solve the technical problem that the existing thermal management system in the prior art is prone to leakage of working fluid to a certain extent.

[0005] The present application provides a thermal management system, comprising: a temperature regulating component, the temperature regulating component is in a long strip shape, and a temperature regulating medium is arranged in the temperature regulating component;

[0006] A heat-conducting component, wherein the number of the heat-conducting components is plural and the plurality of heat-conducting components are sequentially arranged along the length direction of the temperature-regulating component; each of the heat-conducting components is provided with a covering portion, and the covering portion is in contact with at least one wall surface of the temperature-regulating component;

[0007] The temperature conducting component is in contact with the battery core, and the temperature of the temperature regulating medium can be transferred to the battery core through the temperature conducting component to regulate the temperature of the battery core.

[0008] In the above technical solution, further, a cavity is formed inside the temperature regulating component, and a connecting inlet and a connecting outlet are provided on a side wall of the temperature regulating component;

[0009] The connection inlet and the connection outlet are arranged at the same end of the temperature adjustment component.

[0010] In any of the above technical solutions, further, the temperature conducting component is a heat pipe, and the temperature conducting component has a flat tube structure; the length direction of the temperature conducting component is arranged at an angle to the length direction of the temperature regulating component.

[0011] In any of the above technical solutions, further, the heat conducting component is partially bent and arched to form the covering portion, the shape of the covering portion is adapted to the shape of the temperature regulating component, and the inner wall of the covering portion is in contact with multiple side walls of the temperature regulating component.

[0012] In any of the above technical solutions, further, a bending portion is provided at the end of the heat conducting component, and the bending portion is arranged facing the covering portion.

[0013] The present application also provides a power battery, including the thermal management system described in any of the above technical solutions, and thus has all the beneficial technical effects of the thermal management system, which will not be repeated here.

[0014] The power battery further includes a box body, and the temperature regulating component and the temperature conducting component are both arranged in the box body.

[0015] In the above technical solution, further, the box body at least includes a bottom wall and a side wall, the temperature regulating component is arranged on the bottom wall, and the portion of the temperature conducting component other than the covering portion is in contact with the inner wall surface of the box body.

[0016] In any of the above technical solutions, further, the power battery also includes a plurality of battery cells, and the plurality of battery cells are arranged sequentially in the box along the length direction of the temperature regulating component, two adjacent battery cells are staggered, and at least two wall surfaces of each battery cell are in contact with the temperature conducting component.

[0017] In any of the above technical solutions, further, the power battery further includes a heat exchange plate, and the heat exchange plate is provided at least between the temperature conducting component and the battery cell.

[0018] In any of the above technical solutions, further, there are multiple thermal management systems, and multiple battery cells are layered in the box, and each layer of battery cells is correspondingly provided with at least one thermal management system.

[0019] Compared with the prior art, the beneficial effects of this application are:

[0020] The thermal management system provided in the present application includes: a temperature regulating component, which is in the shape of a long strip, and a temperature regulating medium is arranged in the temperature regulating component; a temperature conducting component, a plurality of temperature conducting components, and the plurality of temperature conducting components are arranged sequentially along the length direction of the temperature regulating component; each temperature conducting component is provided with a covering portion, and the covering portion is in contact with at least one wall surface of the temperature regulating component; the temperature conducting component is in contact with the battery cell, and the temperature of the temperature regulating medium can be transferred to the battery cell through the temperature conducting component to regulate the temperature of the battery cell.

[0021] The thermal management system provided in the present application utilizes a combination of heat pipes and conventional cooling pipelines, which not only efficiently realizes the temperature regulation requirements of cooling and heating of the battery system and improves thermal uniformity, but also greatly reduces the number of joints between the heat pipes and the cooling pipelines, thereby effectively ensuring the working life of the thermal management system and reducing the probability and risk of leakage of the temperature regulating fluid.

[0022] The power battery provided in the present application includes the thermal management system described above. Therefore, the thermal management system can fully regulate the temperature of each battery cell to avoid abnormal temperature increase of some battery cells, thereby reducing the risk of thermal runaway of the battery system of the power battery, thereby improving the safety of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the structure of a thermal management system provided in an embodiment of the present application;

[0025] Figure 2 A schematic cross-sectional structure diagram of a temperature regulating component of a thermal management system provided in an embodiment of the present application;

[0026] Figure 3 Another structural schematic diagram of the thermal management system provided in the embodiment of the present application;

[0027] Figure 4 for Figure 3 An enlarged schematic diagram of the thermal management system provided at position A;

[0028] Figure 5 A schematic diagram of a portion of the structure of a power battery provided in an embodiment of the present application;

[0029] Figure 6 A schematic diagram of a cell arrangement structure of a power battery provided in an embodiment of the present application;

[0030] Figure 7 A schematic diagram of another part of the structure of the power battery provided in an embodiment of the present application;

[0031] Figure 8 A schematic diagram of another cell arrangement structure of a power battery provided in an embodiment of the present application.

[0032] Reference numerals:

[0033] 1. Temperature regulating component, 101. Inlet connection, 102. Outlet connection, 103. Cavity, 104. Partition, 2. Temperature conducting component, 201. Covering part, 202. Bending part, 3. Battery cell, 4. Box body, 401. Side wall, 402. Bottom wall, 5. Heat exchange plate. DETAILED DESCRIPTION

[0034] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0035] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0036] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0037] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] Refer to the following Figures 1 to 8 A thermal management system and a power battery according to embodiments of the present application are described.

[0040] First, see Figures 1 to 8As shown, an embodiment of the present application provides a thermal management system, which includes a temperature regulating component 1 and a temperature conducting component 2, wherein the temperature regulating component 1 and the temperature conducting component 2 are arranged alternately, a temperature regulating medium flows in the temperature regulating component 1, and there are multiple temperature conducting components 2. A part of each temperature conducting component 2 is in contact with the temperature regulating component 1, so that the temperature of the liquid medium can be transferred to the temperature conducting component 2, and the temperature conducting component 2 is also in contact with the battery cell 3 of the battery system using the thermal management system, so that the temperature of the temperature conducting component 2 can be transferred to the battery cell 3. By adjusting the temperature of the temperature regulating medium, the battery cell 3 can be cooled or heated to adjust the temperature of the battery cell 3 and avoid excessive temperature changes in the battery cell 3.

[0041] Specifically, the thermostat component 1 is a long tubular structure. Preferably, the thermostat component 1 has a flat tube structure. The radial cross-section of the thermostat component 1 is rectangular or waist-shaped. The interior of the thermostat component 1 is hollow to form a cavity 103 for filling a thermostat medium and for the thermostat medium to flow. The side wall 401 of the thermostat component 1 is provided with a connecting inlet 101 and a connecting outlet 102. The connecting inlet 101 and the connecting outlet 102 are respectively connected to the flow cavity. The connecting inlet 101 is used to inject the thermostat medium into the cavity 103, and the connecting outlet 102 is used to allow the thermostat medium in the cavity 103 to flow out, thereby realizing the replacement and circulation of the thermostat medium. It should be noted that the thermostat medium in this embodiment can be water or other common coolants.

[0042] Preferably, the connection inlet 101 and the connection outlet 102 are arranged at the same end of the temperature control component 1. More preferably, the connection inlet 101 and the connection outlet 102 are arranged on different walls of the temperature control component 1. Such an arrangement makes it convenient to arrange the temperature control component 1 in the battery system. On the other hand, when the temperature control medium has a certain pressure, it can ensure that the temperature control medium has a longer flow path in the temperature control component 1, so as to improve the uniformity of the temperature of the temperature control medium at various positions in the temperature control component 1, thereby ensuring the heat transfer effect and efficiency between each temperature conducting component 2 and the temperature control component 1.

[0043] More preferably, a baffle 104 is provided in the temperature control component 1, and the length of the baffle 104 extends along the length direction of the temperature control component 1. The baffle 104 separates the cavity 103 in the temperature control component 1 into left and right sub-cavities, and the two sub-cavities are connected at one end away from the connecting inlet 101 and the connecting outlet 102, and one of the sub-cavities is connected to the connecting inlet 101, and the other sub-cavity is connected to the connecting outlet 102, so that the temperature control medium flowing into the cavity 103 through the connecting inlet 101 can be directed to flow toward the connecting outlet 102, thereby increasing the orderliness of the flow of the temperature control medium in the temperature control component 1.

[0044] Furthermore, there are multiple heat-conducting components 2, and the multiple heat-conducting components 2 are arranged at intervals along the length direction of the temperature-adjusting component 1, and the multiple temperature-adjusting components 1 have the same structure. In this embodiment, the temperature-adjusting component 1 is specifically a heat pipe with sealed ends at both ends, which has a good heat conduction effect with the temperature-adjusting component 1 and can efficiently absorb the temperature of the temperature-adjusting medium to adjust its own temperature. Preferably, the heat-conducting component 2 is a flat tube, and the length direction of the heat-conducting component 2 is arranged at an angle to the length direction of the temperature-adjusting component 1. Preferably, multiple heat-conducting components 2 are arranged in parallel and at intervals in sequence, and each heat-conducting component 2 is arranged perpendicular to the temperature-adjusting component 1.

[0045] Furthermore, the heat conducting component 2 is partially bent and arched to form a covering portion 201, which has a U-shaped structure. The spatial shape defined by the covering portion 201 is adapted to the shape of the temperature regulating component 1, so that the covering portion 201 can cover the temperature regulating component 1 to keep the heat conducting component 2 and the temperature regulating component 1 fixed, and the covering portion 201 contacts the wall surface of the temperature regulating component 1 to achieve heat transfer between the heat conducting component 2 and the temperature regulating component 1. Figure 4 In the perspective shown, the covering portion 201 is in contact with two large surfaces and one side surface located at the top of the temperature regulating member 1, that is, the covering portion 201 is in contact with three sides of the temperature regulating member 1 at the same time, thereby increasing the contact area between the temperature conducting member 2 and the temperature regulating member 1 to ensure the heat transfer efficiency between the two. Preferably, the covering portion 201 is arranged in the middle position of the temperature conducting member 2.

[0046] Preferably, the fitting position between the covering portion 201 and the temperature regulating component 1 is filled with thermally conductive adhesive, which can fix the two to ensure the stability between the temperature regulating component 1 and the temperature conducting component 2, and can also fill the gap between the two, thereby increasing the heat exchange capacity between the temperature regulating component 1 and the temperature conducting component 2.

[0047] Furthermore, the two ends of the thermal conductive member 2 are folded upward or downward to form a bending portion 202, the bulging direction of the covering portion 201 is upward, and the bending portion 202 is arranged parallel or approximately parallel to the covering portion 201. The bending portion 202 is formed at the end of the thermal conductive member 2, which, on the one hand, makes it easy for the thermal conductive member 2 to fit and fix with the box 4 described below, and on the other hand, forms a U-shaped loading interval between the bending portion 202 and the covering portion 201, which is convenient for placing the battery cell 3. After the battery cell 3 is placed in the loading interval, the bending portion 202, the covering portion 201, and the portion between the bending portion 202 and the covering portion 201 of the thermal conductive member 2 can all contact with the battery cell 3, thereby increasing the heat exchange area between the thermal conductive member 2 and the battery cell 3, and ensuring the temperature regulation effect and efficiency of the battery cell 3.

[0048] To sum up, the thermal management system provided in the present application utilizes a combination of heat pipes and conventional cooling pipelines, which not only efficiently realizes the temperature regulation requirements of cooling and heating of the battery system and improves thermal uniformity, but also greatly reduces the number of joints between the heat pipes and cooling pipelines, thereby effectively ensuring the working life of the thermal management system and reducing the probability and risk of leakage of the temperature regulating fluid.

[0049] Second, see Figures 5 to 8 As shown, an embodiment of the present application further provides a power battery, including the thermal management system described in any of the above embodiments, and thus has all the beneficial technical effects of the thermal management system, which will not be repeated here.

[0050] Furthermore, the present thermal management system further comprises a box body 4, which comprises at least a bottom wall 402 and a side wall 401. In addition, the box body 4 further comprises necessary components such as a top cover (not shown in the figure). There are four side walls 401, which are sequentially connected end to end and arranged on the bottom wall 402. Preferably, the side wall 401 and the bottom wall 402 have an integral structure.

[0051] The temperature regulating component 1 is fixed in the box body 4. Preferably, the overall shape of the temperature regulating component 1 is a rectangular parallelepiped. One large surface of the temperature regulating component 1 is fixed to the bottom wall 402 of the box body 4, or one side surface of the temperature regulating component 1 with a middle area is fixed to the bottom wall 402. The parts of the temperature conducting component 2 located on both sides of the covering portion 201 extend toward the side wall 401 of the box body 4, and the parts of the temperature conducting component 2 located on both sides of the covering portion 201 are respectively in contact with the inner wall surface of the bottom wall 402 of the box body 4 or the inner wall surface of the top cover, and the end of the temperature conducting component 2 is folded upward or downward so that the bending portion 202 can be in contact with the inner wall surface of the side wall 401. Preferably, thermal conductive glue is coated between the temperature conducting component 2 and the bottom wall 402 or the top cover, and between the bending portion 202 and the side wall 401 to ensure the stability of each temperature conducting component 2 in the box body 4.

[0052] Furthermore, the power battery also includes a heat exchange plate 5, and a heat exchange plate 5 is arranged between the temperature conducting component 2 and the battery cell 3. Specifically, the heat exchange plate 5 can be arranged on the side of the bending portion 202 facing the battery cell 3. The fixing method can be but is not limited to gluing, welding, etc. After the battery cells 3 are assembled, the heat exchange plate 5 contacts multiple battery cells 3 in each column. Preferably, a heat exchange plate 5 is also arranged between the temperature conducting component 2 and the bottom wall 402, and between the bending portion 202 and the side wall 401. By arranging the heat exchange plate 5, the edge of the battery system of the power battery, the side of the temperature conducting component 2 and / or the battery cell 3 module can be cooled or heated, thereby increasing the temperature adjustment range of the thermal management system and the power battery and the comprehensiveness of the temperature adjustment, thereby improving the safety of the power battery.

[0053] Furthermore, the power battery also includes a plurality of battery cells 3, and the plurality of battery cells 3 can be arranged in a plurality of columns and layers in the box body 4. Preferably, the plurality of battery cells 3 in each column are arranged sequentially along the length direction of the temperature regulating component 1. It should be noted that, in the embodiment, the number of the temperature regulating components 1 is at least one. When the number of the temperature regulating components 1 is more than one, all the temperature regulating components 1 are arranged in parallel and spaced apart, and all the temperature regulating components 1 are arranged sequentially in the box body 4 along the extension direction of the temperature conducting component 2, and each temperature regulating component 1 is correspondingly configured with a plurality of temperature conducting components 2, and battery cells 3 are arranged on both sides of each temperature regulating component 1, or on both sides of each covering portion 201.

[0054] Furthermore, as described above, the plurality of battery cells 3 may be arranged in multiple layers, and each layer of battery cells 3 is provided with temperature regulating components 1 and temperature conducting components 2 corresponding to the number of rows of battery cells 3 in the layer.

[0055] Preferably, in each column of battery cells 3, two adjacent battery cells 3 are staggered, and the battery cells 3 at odd positions are staggered with the battery cells 3 at even positions. More preferably, the large surface of each battery cell 3 faces the side wall 401 of the box body 4, and the end surface of the battery cell 3 with the smallest area faces the other two side walls 401 of the box body 4. The two side edges of the battery cell 3 with the middle area are distributed in the vertical direction, one of the side edges is fixed to the bottom wall 402 of the box body 4, and the other side edge faces the top cover of the box body 4. Between two adjacent battery cells 3, there is a height difference between the side edges facing the top cover to form a step portion. Preferably, the height of the step portion is adapted to the thickness of the thermal conductive component 2, such as Figures 5 to 8 As shown, such an arrangement enables a corresponding thermal conductive component 2 to be arranged in each step portion, and since the thermal conductive component 2 is provided with a bending portion 202 that is folded upward or downward, each thermal conductive component 2 can be in contact with one of the side edges with a central area and the two end faces with the smallest area of ​​the battery cell 3, thereby increasing the contact area between the thermal conductive component 2 and the battery cell 3, thereby increasing the heat exchange area and heat exchange efficiency with the battery cell 3.

[0056] To sum up, the power battery provided in the present application can fully regulate the temperature of each battery cell through the above-mentioned thermal management system to avoid abnormal temperature increase of some battery cells, thereby reducing the risk of thermal runaway of the battery system of the power battery and improving the safety of the power battery.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A thermal management system, characterized in that: include: A temperature regulating component, wherein the temperature regulating component is in the shape of an elongated strip and a temperature regulating medium is arranged inside the temperature regulating component; A heat-conducting component, wherein the number of the heat-conducting components is plural and the plurality of heat-conducting components are sequentially arranged along the length direction of the temperature-regulating component; each of the heat-conducting components is provided with a covering portion, and the covering portion is in contact with at least one wall surface of the temperature-regulating component; The temperature conducting component is in contact with the battery core, and the temperature of the temperature regulating medium can be transferred to the battery core through the temperature conducting component to regulate the temperature of the battery core.

2. The thermal management system according to claim 1, characterized in that: A cavity is formed inside the temperature regulating component, and a connecting inlet and a connecting outlet are provided on a side wall of the temperature regulating component; The connection inlet and the connection outlet are arranged at the same end of the temperature adjustment component.

3. The thermal management system according to claim 1, characterized in that: The temperature conducting component is a heat pipe, and the temperature conducting component has a flat tube structure; the length direction of the temperature conducting component is arranged at an angle with the length direction of the temperature regulating component.

4. The thermal management system according to claim 1, characterized in that: The heat conducting component is partially bent and arched to form the covering portion, the shape of the covering portion is matched with the shape of the temperature regulating component, and the inner wall of the covering portion is in contact with a plurality of side walls of the temperature regulating component.

5. The thermal management system according to claim 1, characterized in that: A bending portion is disposed at an end of the heat conducting member, and the bending portion is disposed facing the covering portion.

6. A power battery, characterized in that: A thermal management system comprising any one of claims 1 to 5; The power battery further includes a box body, and the temperature regulating component and the temperature conducting component are both arranged in the box body.

7. The power battery according to claim 6, characterized in that: The box body at least comprises a bottom wall and a side wall, and the temperature regulating component is arranged on the bottom wall; and a portion of the temperature conducting component other than the covering portion is in contact with an inner wall surface of the box body.

8. The power battery according to claim 6, characterized in that: The power battery further comprises a plurality of battery cells, which are sequentially arranged in the box along the length direction of the temperature regulating component, two adjacent battery cells are staggered, and at least two wall surfaces of each battery cell are in contact with the temperature conducting component.

9. The power battery according to claim 8, characterized in that: The power battery further includes a heat exchange plate, and the heat exchange plate is disposed at least between the temperature conducting component and the battery core.

10. The power battery according to claim 8, characterized in that: There are multiple thermal management systems, and multiple battery cells are arranged in layers in the box, and each layer of battery cells is correspondingly provided with at least one thermal management system.

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