Battery thermal management system and battery equipment

Abstract

The invention discloses a battery thermal management system and battery equipment. The battery thermal management system comprises a shell, a panel assembly, a first circulation loop and a second circulation loop. The panel assembly is connected with the shell, the panel assembly and the shell define a containing cavity, the containing cavity is used for containing a battery cell, the panel assembly is provided with a first channel and a second channel, and the first channel is communicated with the containing cavity. The first circulation loop communicates with the first channel, the first circulation loop is filled with a first heat exchange medium, a first heat exchanger is arranged on the first circulation loop, and the first heat exchanger can conduct heat exchange on the first heat exchange medium. And the second circulation loop communicates with the second channel, the second circulation loop is filled with a second heat exchange medium, a second heat exchanger is arranged on the second circulation loop, and the second heat exchanger can conduct heat exchange on the second heat exchange medium. According to the battery thermal management system, the temperature difference between each battery cell and each part of the battery cell is reduced, and the heat exchange capability and the heat exchange efficiency of battery equipment can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries and energy storage devices, and in particular to a battery thermal management system and battery equipment. Background Art

[0002] As the power source of current new energy vehicles, batteries need to operate in an appropriate temperature range. Too low a temperature will affect the performance of the battery. Too high a temperature will affect the safety and life of the battery. Therefore, an effective thermal management system is needed to regulate the temperature of the battery.

[0003] In the related art, the temperature of the battery is controlled by an indirect thermal management method. The heat is transferred to the bottom surface of the battery module through the liquid cooling plate, and then to the bottom surface of the battery cell through the bottom surface of the battery module and the thermal conductive glue inside the battery module, and then from the bottom surface of the battery cell to the top surface of the battery cell. This method has a long heat transfer path, a large temperature gradient in different parts of the battery cell, and a large temperature difference between the top and bottom of the battery cell. A single indirect heat exchange method has the problems of low heat exchange capacity and efficiency, and a slow rate of heat exchange of the battery cell. Summary of the invention

[0004] The main purpose of the present invention is to provide a battery thermal management system and battery equipment, aiming to solve the problems of large temperature difference between different parts of the battery cell, low heat exchange efficiency and slow battery heat exchange rate in a single indirect cooling method.

[0005] In order to achieve the above-mentioned object of the invention, the first aspect of the present invention provides a battery thermal management system.

[0006] Battery thermal management system, including:

[0007] case;

[0008] A panel assembly, wherein the panel assembly is connected to the shell and encloses a receiving cavity with the shell, wherein the receiving cavity is used to receive the battery cell, and the panel assembly is provided with a first channel and a second channel, wherein the first channel is communicated with the receiving cavity;

[0009] a first circulation loop, the first circulation loop being in communication with the first channel and filled with a first heat exchange medium, the first circulation loop being provided with a first heat exchanger, and the first heat exchanger being capable of exchanging heat with the first heat exchange medium; and

[0010] The second circulation loop is connected with the second channel and is filled with a second heat exchange medium. The second circulation loop is provided with a second heat exchanger, and the second heat exchanger can exchange heat with the second heat exchange medium.

[0011] In one embodiment, the panel assembly includes a first plate body and a second plate body, the second plate body is disposed at the bottom of the shell, and the second plate body and the shell enclose the accommodating cavity, the second plate body is provided with the second channel, and the first plate body is provided with the first channel;

[0012] The second plate is disposed between the housing and the first plate.

[0013] In one embodiment, a first liquid inlet is provided on one side of the housing, and the first liquid inlet is communicated with the accommodating cavity and the first circulation loop respectively;

[0014] The first plate body is provided with a first liquid outlet communicated with the first liquid inlet, and the first liquid outlet is communicated with the accommodating cavity and the first circulation loop respectively.

[0015] In one of the embodiments, a second liquid inlet and a second liquid outlet are provided on the second plate body, and the second liquid inlet and the second liquid outlet are both connected to the second circulation loop.

[0016] In one of the embodiments, the second plate body is provided with an extension portion, the extension portion extends from an edge of an outer side wall of the shell, and the second liquid inlet and the second liquid outlet are provided on the extension portion.

[0017] In one embodiment, the battery management system further includes a heat conducting plate, one side of the heat conducting plate is attached to a side of the second plate body facing away from the first plate body, and the other side of the heat conducting plate is used to abut against the battery cell.

[0018] In one embodiment, the first channel includes a plurality of first flow channels, and the plurality of first flow channels are arranged along a first direction;

[0019] The second channel includes a plurality of second flow channels, and the plurality of second flow channels are arranged along a second direction, and the first direction intersects with the second direction.

[0020] In one of the embodiments, the battery thermal management system further includes a partition, which is disposed in the shell and is used to isolate two adjacent battery cells. A cavity is defined in the partition and is communicated with the accommodating cavity.

[0021] In one embodiment, the first circulation loop includes a self-circulation loop and a heat exchange loop, the self-circulation loop and the heat exchange loop are connected in parallel, the self-circulation loop is provided with a first solenoid valve, the first solenoid valve is used to control the on-off of the self-circulation loop, the heat exchange loop is provided with the first heat exchanger and the second solenoid valve, the second solenoid valve is used to control the on-off of the heat exchange loop.

[0022] In one embodiment, a first pump assembly is provided on the first circulation loop; and / or

[0023] The second circulation loop is provided with a second pump assembly.

[0024] A second aspect of the present invention provides a battery device, comprising a plurality of battery cells and the above-mentioned battery thermal management system, wherein the plurality of battery cells are arranged in a receiving cavity of the battery thermal management system.

[0025] Beneficial effects:

[0026] In the battery thermal management system of the present invention, the second heat exchange medium circulates in the second circulation loop and the second channel, the second heat exchange medium in the second channel exchanges heat with the battery cell, the second heat exchange medium after heat exchange with the battery cell flows into the second heat exchanger, and the second heat exchanger exchanges heat (cools or heats) the second heat exchange medium, thereby continuously exchanging heat with the battery cell. The first heat exchange medium circulates in the first circulation loop, the first channel and the accommodating chamber. The first heat exchange medium in the accommodating chamber is in direct contact with the battery cell and exchanges heat with the battery cell, the first heat exchange medium after heat exchange with the battery cell flows into the first heat exchanger, and the first heat exchanger exchanges heat with the first heat exchange medium. The first heat exchange medium exchanges heat in contact with the entire battery cell, so that the temperature difference of each part of the battery cell is small. By increasing the direct heat exchange mode of the first circulation loop, the heat exchange capacity and heat exchange efficiency of the battery equipment can be improved, and the rate of heat exchange of the battery cell can be accelerated. By combining the on-off of the first circulation loop, the self-circulation and the on-off of the second circulation loop into a variety of working modes, it is adapted to the different heat load working conditions of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural block diagram of a battery thermal management system according to an embodiment of the present invention.

[0028] Figure 2 It is a schematic structural diagram of a battery thermal management system according to an embodiment of the present invention.

[0029] Figure 3 It is a schematic structural diagram of a shell according to an embodiment of the present invention.

[0030] Figure 4 It is a schematic structural diagram of a second plate body according to an embodiment of the present invention.

[0031] Figure 5 yes Figure 4 Cross-sectional view along the AA direction.

[0032] Figure 6 It is a schematic diagram of the structure inside the first plate body according to an embodiment of the present invention.

[0033] Figure 7It is a schematic diagram of the structure inside the second plate body according to an embodiment of the present invention.

[0034] Figure 8 It is a schematic structural diagram of a battery cell module according to an embodiment of the present invention.

[0035] Fig. 9 It is a schematic structural diagram of a partition according to an embodiment of the present invention.

[0036] in:

[0037] 100, housing; 110, accommodating cavity; 111, battery cell;

[0038] 200, panel assembly; 210, first plate body; 211, first channel; 212, first liquid inlet; 213, first liquid outlet; 220, second plate body; 221, second channel; 222, second liquid inlet; 223, second liquid outlet; 224, extension; 225, through hole; 230, heat conducting plate; 240, partition; 241, cavity; 250, foam;

[0039] 300, first circulation loop; 310, first heat exchanger; 320, self-circulation loop; 321, first solenoid valve; 330, heat exchange loop; 331, second solenoid valve; 340, first pump assembly;

[0040] 400, second circulation loop; 410, second heat exchanger; 420, second pump assembly;

[0041] 500. Cover plate.

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0045] In the description of the present invention, 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, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] like Figures 1 to 3As shown, in some embodiments, a battery thermal management system includes a housing 100, a panel assembly 200, a first circulation loop 300, and a second circulation loop 400. The panel assembly 200 is connected to the housing 100, and encloses a housing cavity 110 with the housing 100. The housing cavity 110 is used to accommodate a battery cell 111. The panel assembly 200 is provided with a first channel 211 and a second channel 221, and the first channel 211 is connected to the housing cavity 110. The first circulation loop 300 is connected to the first channel 211, and the first circulation loop 300 is filled with a first heat exchange medium. The first circulation loop 300 is provided with a first heat exchanger 310, and the first heat exchanger 310 can exchange heat with the first heat exchange medium. The second circulation loop 400 is connected to the second channel 221, and the second circulation loop 400 is filled with a second heat exchange medium. The second circulation loop 400 is provided with a second heat exchanger 410, and the second heat exchanger 410 can exchange heat with the second heat exchange medium.

[0048] It should be noted that the second heat exchange medium circulates in the second circulation loop 400 and the second channel 221, and the second heat exchange medium in the second channel 221 exchanges heat with the battery cell 111. After the heat exchange with the battery cell 111, the second heat exchange medium flows into the second heat exchanger 410, and the second heat exchanger 410 exchanges heat (cools or heats) with the second heat exchange medium, thereby continuously exchanging heat with the battery cell 111. This method is an indirect heat exchange method. The first heat exchange medium circulates in the first circulation loop 300, the first channel 211 and the accommodating chamber 110. The first heat exchange medium in the accommodating chamber 110 is in direct contact with the battery cell 111 (that is, the battery cell 111 is immersed in the first heat exchange medium), and exchanges heat with the battery cell 111. After the heat exchange with the battery cell 111, the first heat exchange medium flows into the first heat exchanger 310, and the first heat exchanger 310 can exchange heat with the first heat exchange medium. The first heat exchange medium exchanges heat in contact with the entire battery cell 111, so that the temperature difference of each part of the battery cell 111 is small. By adding the direct heat exchange mode of the first circulation loop 300, the heat exchange efficiency of the battery cell 111 can be improved, and the heat exchange rate of the battery cell 111 can be accelerated.

[0049] During operation, the battery cell 111 is immersed in the first heat exchange medium, and the heat generated by the battery cell 111 can be directly transferred to the first heat exchange medium. The first heat exchange medium that absorbs the heat flows into the first channel 211 on the panel assembly 200, and flows into the first circulation loop 300 from the first channel 211. The first heat exchanger 310 exchanges heat with the first heat exchange medium, and after reducing the temperature of the first heat exchange medium, the first heat exchange medium returns to the accommodating chamber 110 to continue to absorb the heat of the battery cell 111, forming the first circulation loop 300. Alternatively, the first heat exchange medium does not pass through the first heat exchanger 310, but directly returns to the accommodating chamber 110 through the first solenoid valve 320, forming a self-circulation mode of the first circulation loop 300.

[0050] The heat generated by the battery cell 111 is transferred to the panel assembly 200. The second heat exchange medium in the second channel 221 on the panel assembly 200 absorbs the heat and then enters the second circulation loop 400. In the second circulation loop 400, the second heat exchanger 410 exchanges heat with the second heat exchange medium and dissipates the heat, thereby reducing the temperature of the second heat exchange medium. The cooled second heat exchange medium returns to the second channel 221 and continues to absorb the heat generated by the battery cell 111, forming the second circulation loop 400.

[0051] Specifically, the panel assembly 200 may be a cold plate assembly.

[0052] Specifically, the first heat exchange medium may be an electrically insulating immersion liquid, the first heat exchange medium may be silicone oil, vegetable oil or fluorinated liquid, etc. The second heat exchange medium may be a common coolant, such as a water-ethylene glycol solution.

[0053] Specifically, the first heat exchanger 310 may be a first heater and a first condenser. The first heater may be a PTC heater. The PTC heater is a positive temperature coefficient (Positive Temperature Coefficient) heater. The PTC heater mainly works by utilizing the characteristics of a PTC thermistor.

[0054] Specifically, the second heat exchanger 410 may also be a second heater and a second condenser.

[0055] In some embodiments, the battery thermal management system further includes a cover plate 500 . The cover plate 500 is disposed on the top of the housing 100 and seals the accommodating cavity 110 .

[0056] like Figures 4 to 7 As shown, in some embodiments, the panel assembly 200 includes a first plate 210 and a second plate 220. The second plate 220 is disposed at the bottom of the housing 100, and the second plate 220 and the housing 100 enclose a receiving cavity 110. The second plate 220 is provided with a second channel 221, and the first plate 210 is provided with a first channel 211. The second plate 220 is disposed between the housing 100 and the first plate 210. That is, the second plate 220 can indirectly dissipate heat for the battery cell 111 in the housing 100, and can also dissipate heat for the first heat exchange medium in the first plate 210. When the heat of the battery cell 111 is too large, in addition to the first heat exchanger 310 cooling the first heat exchange medium, the second plate 220 can also indirectly cool the first heat exchange medium and the battery cell 111, thereby improving the cooling effect of the battery cell 111.

[0057] Specifically, a through hole 225 is formed on the second plate 220 . The through hole 225 connects the accommodating chamber 110 and the first channel 211 . The first heat exchange medium in the accommodating chamber 110 enters the first channel 211 through the through hole 225 .

[0058] Specifically, the first plate body 210 and the second plate body 220 may be welded into one body.

[0059] Specifically, both the first plate body 210 and the second plate body 220 may be cooling plates.

[0060] Specifically, the first plate body 210 is a lower plate, and the second plate body 220 is an upper plate.

[0061] In some embodiments, the battery thermal management system includes a first circulation loop 300 including a self-circulation loop 320 and a heat exchange loop 330, the self-circulation loop 320 and the heat exchange loop 330 are connected in parallel, the self-circulation loop 320 is provided with a first solenoid valve 321, the first solenoid valve 321 is used to control the on-off of the self-circulation loop 320, and the heat exchange loop 330 is provided with a first heat exchanger 310 and a second solenoid valve 331, the second solenoid valve 331 is used to control the on-off of the heat exchange loop 330. When the first solenoid valve 321 is opened and the second solenoid valve 331 is closed, the first heat exchange medium circulates through the accommodating chamber 110, the first channel 211 and the self-circulation loop 320. When the first solenoid valve 321 is closed and the second solenoid valve 331 is opened, the first heat exchange medium circulates through the accommodating chamber 110, the first channel 211 and the heat exchange loop 330.

[0062] In other embodiments, the second solenoid valve 331 may not be provided on the heat exchange loop 330. When the first solenoid valve 321 is opened, the flow resistance of the first heat exchange medium in the self-circulation loop 320 is smaller than the flow resistance of the heat exchange loop 330, so that the first heat exchange medium circulates in the accommodating chamber 110, the first channel 211 and the self-circulation loop 320. When the first solenoid valve 321 is closed, the first heat exchange medium circulates in the accommodating chamber 110, the first channel 211 and the heat exchange loop 330.

[0063] Specifically, a first pump assembly 340 is disposed on the first circulation loop 300 , and a second pump assembly 420 is disposed on the second circulation loop 400 .

[0064] It should be noted that the first pump assembly 340 can control the opening and closing of the first circulation loop 300. When the first pump assembly 340 is turned on, the pressure in the first circulation loop 300 is increased so that the first heat exchange medium can circulate in the first circulation loop 300, and the first circulation loop 300 is in an open state. When the first pump assembly 340 is turned off, the first heat exchange medium cannot circulate in the first circulation loop 300, and the first circulation loop 300 is in a closed state.

[0065] The second pump assembly 420 can control the opening and closing of the second circulation loop 400. When the second pump assembly 420 is turned on, the pressure in the second circulation loop 400 is increased so that the second heat exchange medium can circulate in the second circulation loop 400, and the second circulation loop 400 is in an open state. When the second pump assembly 420 is turned off, the second heat exchange medium cannot circulate in the second circulation loop 400, and the second circulation loop 400 is in a closed state.

[0066] The self-circulation loop 320, the heat exchange loop 330, and the second circulation loop 400 of the first circulation loop 300 can be jointly regulated by the first solenoid valve 321, the second solenoid valve 331, the first pump assembly 340, and the second pump assembly 420. According to the different temperatures of the battery cells 111, different working modes of the first circulation loop 300 and the second circulation loop 400 are turned on, so that the temperature of the battery cells 111 is regulated within a reasonable range.

[0067] For example, when the first pump assembly 340 and the first solenoid valve 321 are turned on, and the second pump assembly 420 and the second solenoid valve 331 are turned off, the first heat exchange medium flows in the accommodating chamber 110, the first channel 211 and the self-circulating loop 320, and a self-circulating temperature equalization mode is realized. That is, a working mode for realizing automatic and balanced temperature distribution of the battery cell 111 is realized, so that the heat in the battery cell 111 can be automatically transferred and redistributed between different parts, thereby achieving the purpose of temperature uniformity and controlling the temperature difference at different positions of the battery cell 111 to a minimum value.

[0068] When the battery cell 111 is in a state of high-rate fast charging, the first pump assembly 340, the second pump assembly 420, the second solenoid valve 331, the first condenser and the second condenser are turned on, and the first solenoid valve 321 is closed. The first heat exchange medium of the heat exchange loop 330 and the second heat exchange medium of the second circulation loop cool the battery cell at the same time, greatly improving the heat dissipation capacity of the battery cell 111 to cool down the battery cell 111 in the highest temperature state.

[0069] When the first solenoid valve 321, the first pump assembly 340, and the second pump assembly 420 are opened and the second solenoid valve 331 is closed, the first heat exchange medium self-circulates to equalize the temperature of the battery cell 111, and the second heat exchange medium heats or cools the battery cell 111. While regulating the temperature of the battery cell 111, it can also ensure that the temperature difference of the battery cell 111 is at a small value.

[0070] When the temperature control range of the battery cell 111 is small, the first circulation loop 300 or the second circulation loop 400 can be opened alone. That is, the first pump assembly 340 and the first heat exchanger 310 are opened alone and the first solenoid valve 321 is closed, or the second heat exchanger 410 and the second pump assembly 420 are opened alone to meet the heat dissipation requirements of the smaller heat load condition.

[0071] In some embodiments, a first pump assembly 340 is disposed on the first circulation loop 300. The first pump assembly 340 is used to provide pressure for the first heat exchange medium to circulate between the accommodating chamber 110, the first channel 211 and the first circulation loop 300.

[0072] In some embodiments, a second pump assembly 420 is disposed on the second circulation loop 400. The second pump assembly 420 is used to provide pressure for the second heat exchange medium to circulate between the second channel 221 and the second circulation loop 400.

[0073] In other embodiments, an electronic expansion valve, a condenser, a compressor and a gas-liquid separator are sequentially arranged on the second circulation loop 400. That is, the second circulation loop 400 is connected in series with the air conditioning loop to improve heat exchange efficiency and reduce energy consumption.

[0074] In other embodiments, a radiator and a motor are provided on the first circulation loop 300 .

[0075] like Figure 3 As shown, in some embodiments, a first liquid inlet 212 is provided on one side of the housing 100. The first liquid inlet 212 is respectively connected to the accommodating chamber 110 and the first circulation loop 300. The first plate 210 is provided with a first liquid outlet 213 connected to the first liquid inlet 212, and the first liquid outlet 213 is respectively connected to the accommodating chamber 110 and the first circulation loop 300. The first heat exchange medium enters the accommodating chamber 110 from the first liquid inlet 212, and flows from the accommodating chamber 110 into the first circulation loop 300 through the first liquid outlet 213.

[0076] Specifically, the first liquid inlet 212 and the first liquid outlet 213 may be circular in shape to fit a circular pipe.

[0077] Specifically, the first liquid inlet 212 is disposed on the inner side wall of the top of the housing 100 , so that the first heat exchange medium can enter the accommodating cavity 110 from the first liquid inlet 212 and immerse the battery cell 111 .

[0078] like Figure 2 As shown, in some embodiments, the second plate body 220 is provided with a second liquid inlet 222 and a second liquid outlet 223 that are connected. The second liquid inlet 222 and the second liquid outlet 223 are both connected to the second circulation loop 400. The second heat exchange medium enters the second channel 221 from the second liquid inlet 222, and the second heat exchange medium in the second channel 221 flows into the second circulation loop 400 through the second liquid outlet 223.

[0079] Specifically, the first liquid inlet 212 and the first liquid outlet 213 may be circular in shape to fit a circular pipe.

[0080] In some embodiments, the second plate 220 is provided with an extension portion 224. The extension portion 224 extends from the outer wall edge of the housing 100, and the extension portion 224 is provided with a second liquid inlet 222 and a second liquid outlet 223.

[0081] It should be noted that the second liquid inlet 222 and the second liquid outlet 223 are arranged on the extension portion 224 to avoid the space occupation and structural complexity problems that may be caused by the arrangement of interfaces on the housing 100 or other parts. The extension portion 224 extending from the edge of the outer wall of the housing 100 provides an independent installation position for the liquid inlet and the liquid outlet, which is convenient for connection with external pipelines and does not affect the space utilization inside the housing 100.

[0082] like Figure 8 As shown, in some embodiments, the battery management system further includes a heat conducting plate 230 . One side of the heat conducting plate 230 is attached to the side of the second plate 220 away from the first plate 210 , and the other side of the heat conducting plate 230 is used to abut against the battery cell 111 .

[0083] Specifically, the other side of the heat conducting plate 230 is used to abut the bottom of the battery cell 111. The first plate 210 contacts the bottom of the battery cell 111 through the heat conducting plate 230 to transfer heat, thereby enhancing the heat exchange capacity between the first plate 210 and the bottom of the battery cell 111 and improving the heat exchange efficiency.

[0084] Specifically, the heat conducting plate 230 may be a heat conducting adhesive.

[0085] like Figure 6 and Figure 7 As shown, in some embodiments, the first channel 211 includes a plurality of first flow channels. The plurality of first flow channels are arranged along a first direction. The second channel 221 includes a plurality of second flow channels, and the plurality of second flow channels are arranged along a second direction. The first direction intersects with the second direction. The Y-axis direction is the first direction. The X-axis direction is the second direction.

[0086] When the battery cell 111 generates heat during operation, the heat is transferred to the panel assembly 200. The first heat exchange medium in the first flow channel and the second heat exchange medium in the second flow channel flow in their respective flow channels to absorb heat. Since the first direction intersects with the second direction, the first heat exchange medium and the second heat exchange medium flow in different directions, forming a cross heat exchange state. The cross heat exchange method can make heat transfer and dissipate more quickly in different directions, thereby improving heat exchange efficiency.

[0087] Specifically, the first direction and the second direction are arranged vertically. That is, the first flow channel and the second flow channel are arranged vertically. The vertically arranged first flow channel and the second flow channel enable the first heat exchange medium and the second heat exchange medium to flow in different directions, thereby optimizing the heat exchange path. Heat can be quickly taken away from multiple directions, thereby avoiding local accumulation of heat and improving temperature uniformity and heat exchange effectiveness.

[0088] like Figure 8 and Fig. 9 As shown, in some embodiments, the battery thermal management system further includes a partition 240. The partition 240 is disposed in the housing 100, and is used to isolate two adjacent battery cells 111. A cavity 241 is provided in the partition 240, and the cavity 241 is communicated with the accommodating cavity 110.

[0089] It should be noted that when the battery cell 111 generates heat during operation, the heat will be transferred to the first heat exchange medium in the accommodating chamber 110. Since the cavity 241 in the partition 240 is connected to the accommodating chamber 110, the first heat exchange medium can flow between the cavity 241 and the accommodating chamber 110. During the flow process, the first heat exchange medium takes away the heat from around the battery cell 111, thereby achieving thermal management of the battery cell 111. The heat exchange efficiency can be optimized by reasonably designing the structure of the cavity 241 and the flow path of the heat exchange medium.

[0090] Specifically, the cavity 241 can be provided in plurality. The plurality of cavities 241 are arranged at intervals along the length direction of the partition 240. The plurality of cavities 241 greatly increases the contact area between the partition 240 and the first heat exchange medium, so that more heat can be absorbed and transferred by the first heat exchange medium, thereby improving the heat exchange efficiency. Compared with a single cavity 241, the plurality of cavities 241 can more comprehensively cover the space around the battery cell 111, making the thermal management more uniform and effective.

[0091] Specifically, the shape and size of the separator 240 are adapted to the battery cell 111 .

[0092] Specifically, the thickness of the partition 240 may be 1 to 5 mm.

[0093] Specifically, the material of the partition plate 240 may be a material with high thermal conductivity. The partition plate 240 may be an aluminum partition plate 240 .

[0094] In some embodiments, the battery thermal management system further includes a foam 250. The foam 250 is disposed on a side of the battery cell 111 away from the partition 240. The foam 250 has a certain elasticity and softness. When the battery cell 111 is working or subjected to external forces, the foam 250 can buffer and absorb the expansion space of the battery cell 111, thereby reducing the mechanical impact and vibration of the battery cell 111.

[0095] Specifically, the foam 250 may be provided in plurality, and the plurality of foams 250 are provided in one-to-one correspondence with the plurality of battery cells 111 .

[0096] In other embodiments, a battery device includes a plurality of battery cells 111 and a battery thermal management system, and the plurality of battery cells 111 are disposed in a receiving cavity 110 of the battery thermal management system.

[0097] Specifically, the battery device can be used as a power battery.

[0098] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery thermal management system, characterized in that: include: case; A panel assembly, wherein the panel assembly is connected to the shell and encloses a receiving cavity with the shell, wherein the receiving cavity is used to receive the battery cell, and the panel assembly is provided with a first channel and a second channel, wherein the first channel is communicated with the receiving cavity; a first circulation loop, the first circulation loop being in communication with the first channel and filled with a first heat exchange medium, the first circulation loop being provided with a first heat exchanger, and the first heat exchanger being capable of exchanging heat with the first heat exchange medium; and The second circulation loop is connected with the second channel and is filled with a second heat exchange medium. The second circulation loop is provided with a second heat exchanger, and the second heat exchanger can exchange heat with the second heat exchange medium.

2. The battery thermal management system according to claim 1, characterized in that: The panel assembly includes a first plate body and a second plate body, the second plate body is arranged at the bottom of the shell, and the second plate body and the shell enclose the accommodating cavity, the second plate body is provided with the second channel, and the first plate body is provided with the first channel; The second plate is disposed between the housing and the first plate.

3. The battery thermal management system according to claim 2, characterized in that: A first liquid inlet is provided on one side of the shell, and the first liquid inlet is communicated with the accommodating cavity and the first circulation loop respectively; The first plate body is provided with a first liquid outlet communicated with the first liquid inlet, and the first liquid outlet is communicated with the accommodating cavity and the first circulation loop respectively.

4. The battery thermal management system according to claim 2, characterized in that: The second plate body is provided with a second liquid inlet and a second liquid outlet which are in communication with each other. The second liquid inlet and the second liquid outlet are both in communication with the second circulation loop.

5. The battery thermal management system according to claim 4, characterized in that: The second plate body is provided with an extension portion, the extension portion extends from the edge of the outer side wall of the shell, and the second liquid inlet and the second liquid outlet are provided on the extension portion.

6. The battery thermal management system according to claim 2, characterized in that: The battery management system further includes a heat conducting plate, one side of which is attached to a side of the second plate body away from the first plate body, and the other side of the heat conducting plate is used to abut against the battery cell.

7. The battery thermal management system according to claim 1, characterized in that: The first channel includes a plurality of first flow channels, and the plurality of first flow channels are arranged along a first direction; The second channel includes a plurality of second flow channels, and the plurality of second flow channels are arranged along a second direction, and the first direction intersects with the second direction.

8. The battery thermal management system according to claim 1, characterized in that: The battery thermal management system further includes a partition, which is disposed in the shell and is used to isolate two adjacent battery cells. A cavity is defined in the partition, and the cavity is communicated with the accommodating cavity.

9. The battery thermal management system according to claim 1, characterized in that: The first circulation loop includes a self-circulation loop and a heat exchange loop, which are connected in parallel. The self-circulation loop is provided with a first solenoid valve, which is used to control the on-off of the self-circulation loop. The heat exchange loop is provided with the first heat exchanger and the second solenoid valve, which is used to control the on-off of the heat exchange loop.

10. The battery thermal management system according to claim 1, characterized in that: The first circulation loop is provided with a first pump assembly; and / or The second circulation loop is provided with a second pump assembly.

11. A battery device, characterized in that: It comprises a plurality of battery cells and the battery thermal management system according to any one of claims 1 to 10, wherein the plurality of battery cells are arranged in a receiving cavity of the battery thermal management system.

Images