Heat exchange device, heat exchange system, battery and electric device

Abstract

The embodiment of the utility model provides a heat exchange device, a heat exchange system, a battery and an electric device, and belongs to the technical field of batteries. The heat exchange device is applied to the battery and comprises a heat exchange body, a first heat exchange channel and a second heat exchange channel are formed in the heat exchange body; the inlet end of the expansion valve is connected with the outlet end of the first heat exchange runner, and the outlet end of the expansion valve is connected with the inlet end of the second heat exchange runner; wherein the second heat exchange flow channel comprises an upstream flow channel and a downstream flow channel which are connected in sequence, the upstream flow channel is connected with the outlet end of the expansion valve, the upstream flow channel is used for exchanging heat with the battery monomers, and the downstream flow channel is used for exchanging heat with the first heat exchange flow channel. The upstream flow channel exchanges heat with the single batteries, the temperature uniformity is better, the heat exchange effect is better, the downstream flow channel exchanges heat with the first heat exchange flow channel to reduce the temperature of the front side of the expansion valve, then the temperature of a heat exchange medium at the rear end of the expansion valve is lower, and the heat exchange effect on the single batteries and the energy utilization efficiency are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a heat exchange device, a heat exchange system, a battery and an electrical device. Background Art

[0002] Generally, a cold plate is used in a battery pack to exchange heat for the battery cells. When the heat exchange medium circulating in the cold plate is a heat exchange medium, the heat exchange medium will change from a two-phase state of gas-liquid mixture to a gas phase after flowing into the cold plate. In the two-phase state, the temperature fluctuation is small and the heat exchange effect is stable. However, the heat exchange medium is completely vaporized near the outlet of the cold plate, and the heat exchange medium heats up quickly, resulting in a large temperature difference, which affects the heat exchange effect. Utility Model Content

[0003] The present application provides a heat exchange device, a heat exchange system, a battery and an electrical device to solve the technical problem that the flow channel temperature near the outlet of the cold plate changes quickly and the temperature difference is large, resulting in poor heat exchange effect.

[0004] In a first aspect, an embodiment of the present application provides a heat exchange device, applied to a battery, comprising:

[0005] A heat exchange body is formed with a first heat exchange flow channel and a second heat exchange flow channel;

[0006] an expansion valve, wherein the inlet end of the expansion valve is connected to the outlet end of the first heat exchange channel, and the outlet end of the expansion valve is connected to the inlet end of the second heat exchange channel;

[0007] The second heat exchange channel comprises an upstream channel and a downstream channel connected in sequence, the upstream channel is connected to the outlet end of the expansion valve, the upstream channel is used for heat exchange with the battery cell, and the downstream channel is used for heat exchange with the first heat exchange channel.

[0008] In the above technical scheme, the heat exchange medium in the upstream flow channel is in a two-phase state, and heat is exchanged with the battery cells through the upstream flow channel, which has better temperature uniformity and better heat exchange effect. The heat exchange medium in the downstream flow channel is in a gas phase state, and the residual cold of the heat exchange medium in the downstream flow channel is used to exchange heat with the first heat exchange flow channel to reduce the temperature in front of the expansion valve, thereby making the temperature of the heat exchange medium after passing through the expansion valve lower, thereby improving the heat exchange effect of the upstream flow channel on the battery cells and the overall energy utilization efficiency.

[0009] In some embodiments, the heat exchange body comprises:

[0010] The heat exchange plate has a first surface and a second surface which are arranged opposite to each other;

[0011] A first flow channel plate, which is covered on the first surface, and the first flow channel plate and the first surface define the first heat exchange flow channel;

[0012] The second flow channel plate is covered on the second surface, the second flow channel plate and the second surface define the second heat exchange flow channel, and the area on the first surface corresponding to the upstream flow channel is used for heat exchange with the battery cell, and the first heat exchange flow channel and the downstream flow channel exchange heat through the heat exchange plate.

[0013] In the above technical solution, by arranging the heat exchange plate, the first flow channel plate and the second flow channel plate, the assembly is simple, the production efficiency is high, the occupied space is small and the heat exchange effect is good.

[0014] In some embodiments, the upstream flow channel and the downstream flow channel are sequentially arranged in the length direction of the heat exchange plate, and the first heat exchange flow channel and the downstream flow channel are arranged on both sides back to back in the thickness direction of the heat exchange plate.

[0015] In the above technical solution, the upstream flow channel and the downstream flow channel are arranged in sequence in the length direction of the heat exchange plate, so as to facilitate the corresponding arrangement of the downstream flow channel and the first heat exchange flow channel.

[0016] In some embodiments, the heat exchange plate includes a first heat exchange zone and a second heat exchange zone distributed along the length direction of the heat exchange plate, the first heat exchange flow channel and the downstream flow channel are respectively located on two sides of the first heat exchange zone, and the upstream flow channel is located in the second heat exchange zone, wherein the length direction of the first heat exchange zone extends along the width direction of the heat exchange plate.

[0017] In the above technical solution, the first heat exchange area is arranged on one side in the length direction of the heat exchange plate to facilitate the arrangement of the battery monomers in the second heat exchange area, thereby reducing the influence of the first heat exchange channel on the arrangement of the battery monomers.

[0018] In some embodiments, the inlet end of the second heat exchange channel is arranged close to the first side in the width direction of the heat exchange plate, the end of the upstream channel connected to the downstream channel is arranged close to the second side in the width direction of the heat exchange plate, and the inlet end of the second heat exchange channel and the end of the upstream channel connected to the downstream channel are both arranged close to the first heat exchange area;

[0019] The outlet end of the second heat exchange channel is arranged close to the first side in the width direction of the heat exchange plate, the downstream channel extends along the width direction of the heat exchange plate, and one end of the downstream channel close to the second side in the width direction of the heat exchange plate is bent and connected to the upstream channel.

[0020] In the above technical solution, the flow direction of the second heat exchange channel is reasonably arranged to optimize the heat exchange effect on the battery cell, and the inlet and outlet ends of the second heat exchange channel are centrally arranged to facilitate the installation of the connector and optimize the internal space layout of the battery.

[0021] In some embodiments, the inlet and outlet ends of the first heat exchange channel are both located on the first channel plate, and the inlet and outlet ends of the second heat exchange channel are both located on the first surface.

[0022] In the above technical solution, the inlet and outlet ends of the first heat exchange channel and the second heat exchange channel are arranged on the same side of the heat exchange plate to facilitate the connection of pipelines.

[0023] In some embodiments, the expansion valve is mounted on the first surface.

[0024] In the above technical solution, the expansion valve is integrated on the heat exchange plate to reduce the distance between the expansion valve and the second heat exchange channel, thereby improving the heat exchange effect.

[0025] In some embodiments, a plurality of branch channels are connected in parallel between the inlet and outlet ends of the second heat exchange channel, and the branch channels include a first branch channel belonging to the upstream channel and a second branch channel belonging to the downstream channel.

[0026] In the above technical solution, a plurality of branch flow channels are provided to shorten the flow channel lengths at the inlet and outlet ends of the second heat exchange flow channel and increase the coverage area of ​​the second heat exchange flow channel.

[0027] In some embodiments, a distance between two adjacent first branch flow channels is greater than a distance between two adjacent second branch flow channels.

[0028] In the above technical solution, by setting different intervals between branch channels, the coverage area of ​​the upstream channel is increased and the coverage area of ​​the downstream channel is reduced, thereby optimizing the spatial layout.

[0029] In some embodiments, the first branch channel includes a plurality of first sub-segments and second sub-segments connected in sequence, the first sub-segments extend along the length direction of the heat exchange body, the plurality of first sub-segments are spaced apart along the width direction of the heat exchange body, the second sub-segments extend along the width direction of the heat exchange body, the first first sub-segment is connected to the outlet end of the expansion valve, one ends of two adjacent first sub-segments are connected through the second sub-segment, and the last first sub-segment is connected to the inlet end of the second branch channel.

[0030] In some embodiments, the number of the first sub-segments is N, the number of the second sub-segments is N-1, N is an even number, and N≥2.

[0031] In some embodiments, the second branch channel includes a main section extending along the width direction of the heat exchange body and a connecting section extending along the length direction of the heat exchange body, one end of the connecting section is connected to the first branch channel, the other end of the connecting section is connected to one end of the main section, and the other end of the main section is connected to the outlet end of the second heat exchange channel.

[0032] In some embodiments, the first heat exchange channel includes a plurality of first sub-channels extending along the width direction of the heat exchange body and distributed along the length direction of the heat exchange body, the plurality of first sub-channels are connected end to end, and the first sub-channels correspond to the main body section of the second branch channel.

[0033] In some embodiments, the flow areas of the branch channels are the same.

[0034] In some embodiments, the second heat exchange channel also includes a first confluence channel and a second confluence channel, the ends of the plurality of branch channels are connected in parallel between the first confluence channel and the second confluence channel, the inlet end of the second heat exchange channel is arranged at the first confluence channel, and the outlet end of the second heat exchange channel is arranged at the second confluence channel.

[0035] In the above technical solution, by providing a converging channel, the connection of multiple branch channels is facilitated, and the channel layout is simplified.

[0036] In some embodiments, the inlet end of the second heat exchange channel is located between 1 / 4 and 3 / 4 of the length of the first confluence channel, and the outlet end of the second heat exchange channel is located between 1 / 4 and 3 / 4 of the length of the second confluence channel.

[0037] In the above technical solution, by limiting the positions of the inlet and outlet ends of the second heat exchange flow channel, the flow distribution in the multiple branch flow channels is made relatively uniform, thereby improving the heat exchange uniformity.

[0038] In some embodiments, the flow area of ​​the first heat exchange channel near the outlet end is greater than the flow area of ​​the first heat exchange channel near the inlet end.

[0039] In the above technical solution, the flow area of ​​the first heat exchange flow channel is adjusted so that the heat exchange medium expands slightly before flowing into the expansion valve, thereby improving the subsequent expansion effect when passing through the expansion valve, thereby improving the heat exchange effect.

[0040] In some embodiments, the heat exchange body comprises:

[0041] a first flow channel tube, wherein the first heat exchange flow channel is formed in the first flow channel tube;

[0042] A second flow channel tube, in which the second heat exchange flow channel is formed, the second flow channel tube is arranged on one side of the first flow channel tube in the thickness direction, the portion of the second flow channel tube corresponding to the downstream flow channel exchanges heat with the first flow channel tube, and the portion of the second flow channel tube corresponding to the upstream flow channel is used for exchanging heat with the battery cell on the side facing the first flow channel tube.

[0043] In a second aspect, an embodiment of the present application provides a heat exchange system, which is applied to a battery. The heat exchange system includes:

[0044] The heat exchange device as described in any one of the first aspects;

[0045] A compressor, wherein an inlet end of the compressor is connected to an outlet end of the second heat exchange flow channel;

[0046] A condenser, wherein the inlet end of the condenser is connected to the outlet end of the compressor, and the outlet end of the condenser is connected to the inlet end of the first heat exchange channel.

[0047] In the above technical scheme, the heat exchange medium in the upstream flow channel of the heat exchange device is in a two-phase state, and heat is exchanged with the battery cell through the upstream flow channel, so that the temperature uniformity is better and the heat exchange effect is better. The heat exchange medium in the downstream flow channel is in a gas phase state, and the residual cold capacity of the heat exchange medium in the downstream flow channel is used to exchange heat with the first heat exchange flow channel to reduce the temperature in front of the expansion valve, thereby making the temperature of the heat exchange medium after passing through the expansion valve lower, thereby improving the heat exchange effect of the upstream flow channel on the battery cell and the overall energy utilization efficiency, and improving the durability of the compressor and the thermal management effect on the battery.

[0048] In a third aspect, an embodiment of the present application provides a battery, comprising:

[0049] Box;

[0050] A plurality of battery cells, wherein the plurality of battery cells are installed in the box;

[0051] As described in the second aspect, the heat exchange system is installed in the box body and is used for exchanging heat with the multiple battery cells.

[0052] In the above technical solution, the working stability of the battery cells and the battery is improved by using the heat exchange system as described in the second aspect.

[0053] In a fourth aspect, an embodiment of the present application provides an electrical device, including:

[0054] The battery as described in the third aspect is used to supply power to the electrical device.

[0055] In the above technical solution, by using the battery as described in the third aspect, the working stability of the electrical device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0057] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0058] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0059] Figure 3 A schematic diagram of the structure of a heat exchange device provided in some embodiments of the present application;

[0060] Figure 4 An exploded view of the structure of a heat exchange device provided in some embodiments of the present application;

[0061] Figure 5 A schematic diagram of the structure of a first heat exchange channel provided in some embodiments of the present application;

[0062] Figure 6 A schematic diagram of the structure of a second heat exchange channel provided in some embodiments of the present application;

[0063] Figure 7 A schematic diagram of the structure of an expansion valve provided in some embodiments of the present application.

[0064] Reference numerals:

[0065] Vehicle 1, battery 10, motor 20, controller 30;

[0066] Box body 11, first box body 111, second box body 112;

[0067] Battery cell 12;

[0068] Heat exchange device 13, heat exchange plate 131, first surface 1311, second surface 1312, second inlet 1313, second outlet 1314, first flow channel plate 132, first groove 1321, first heat exchange flow channel 1322, first sub-flow channel 13221, first inlet 1323, first outlet 1324, second flow channel plate 133, second groove 1331, second heat exchange flow channel 1332, first branch flow channel 13321, first sub-segment 13321a, second sub-segment 13321b, second branch flow channel 13322, main section 13322a, connecting section 13322b, first confluence channel 13323, second confluence channel 13324, expansion valve 134. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0070] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0071] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0072] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0074] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0075] The battery cells mentioned in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. The battery cells may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0076] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0077] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0078] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0079] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety and cycle life.

[0080] In general power batteries, in order to make the battery obtain sufficient power, multiple battery cells in the battery box are usually stacked in an arrangement. However, the battery cells will generate a lot of heat during the continuous charging and discharging process, which will cause the internal temperature of the battery to rise, and the structure of multiple battery cells stacked will aggravate this phenomenon, which will seriously affect the performance and service life of the battery, and even cause the battery to have a large safety hazard during use, which is not conducive to the safety of consumers. Therefore, in the prior art, a cold plate is usually set inside the battery to exchange heat for the battery cells. When the heat exchange medium circulating in the cold plate is a heat exchange medium, the heat exchange medium will change from a two-phase state of gas-liquid mixture to a gas phase after flowing into the cold plate. In the two-phase state, the temperature fluctuation is small and the heat exchange effect is stable. At the position close to the outlet of the cold plate, the heat exchange medium is completely gasified, and the temperature rise rate of the heat exchange medium is fast, resulting in a large temperature difference change, so that the heat exchange effect of the cold plate for the battery cells near the outlet position is poor, affecting the overall heat exchange effect.

[0081] Based on the above considerations, in order to solve the technical problem that the flow channel temperature near the outlet of the cold plate changes quickly and the temperature difference is large, resulting in poor heat exchange effect. This application designs a heat exchange device, which is formed with a first heat exchange flow channel and a second heat exchange flow channel. The heat exchange device also includes: an expansion valve, the outlet end of the first heat exchange flow channel is connected to the inlet end of the expansion valve, and the outlet end of the expansion valve is connected to the inlet end of the second heat exchange flow channel; the second heat exchange flow channel includes an upstream flow channel and a downstream flow channel connected in sequence from the inlet end to the outlet end, the upstream flow channel is used for heat exchange with the battery cell, and the downstream flow channel is used for heat exchange with the first heat exchange flow channel.

[0082] In a heat exchange device of this structure, the upstream flow channel is closer to the expansion valve, so that the heat exchange medium in the upstream flow channel is in a two-phase state, and heat exchange with the battery cell through the upstream flow channel has better temperature uniformity and better heat exchange effect. The heat exchange medium in the downstream flow channel is in a gas phase state, and the residual cold capacity of the heat exchange medium in the downstream flow channel is used to exchange heat with the first heat exchange flow channel to reduce the temperature in front of the expansion valve, thereby making the temperature of the heat exchange medium after passing through the expansion valve lower, thereby improving the heat exchange effect of the upstream flow channel on the battery cell and the overall energy utilization efficiency.

[0083] The battery disclosed in the embodiment of the present application can be used in, but is not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery thermal management system disclosed in the present application and batteries etc. can be used to form the electrical device, which is conducive to improving the scope of application of the battery thermal management system and reducing the difficulty of assembling the battery thermal management system.

[0084] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0085] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device in an embodiment of the present application.

[0086] like Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 20, a controller 30 and a battery 10 may be arranged inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 20. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0087] In order to meet different power usage requirements, the battery 10 may include a plurality of battery cells 12 , wherein the plurality of battery cells 12 may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series connection and parallel connection.

[0088] like Figure 2As shown, it is an exploded view of the structure of a battery 10 of an embodiment of the present application. The battery 10 includes a box body 11 and a plurality of battery cells 12, and the battery cells 12 are used to be accommodated in the box body 11. Among them, the box body 11 is used to provide an assembly space for the battery cells 12, and the box body 11 can adopt a variety of structures. In some embodiments, the box body 11 may include a first box body 111 and a second box body 112, and the first box body 111 and the second box body 112 cover each other, and the first box body 111 and the second box body 112 jointly define an assembly space for accommodating the battery cells 12. The second box body 112 can be a hollow structure with one end open, and the first box body 111 can be a plate-like structure. The first box body 111 covers the open side of the second box body 112, so that the first box body 111 and the second box body 112 jointly define an assembly space; the first box body 111 and the second box body 112 can also be hollow structures with one side open, and the open side of the first box body 111 covers the open side of the second box body 112. Of course, the box body 11 formed by the first box body 111 and the second box body 112 can be in various shapes, such as a cylinder, a cuboid, etc.

[0089] In the battery 10, multiple battery cells 12 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 12 are connected in series and in parallel. Multiple battery cells 12 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 12 is accommodated in the box 11; of course, the battery 10 can also be a battery module formed by connecting multiple battery cells 12 in series, in parallel, or in a mixed connection, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery 10 may also include other structures, for example, the battery 10 may also include a converging component for realizing electrical connection between multiple battery cells 12.

[0090] Each battery cell 12 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 12 may be cylindrical, flat, rectangular, or in other shapes.

[0091] According to some embodiments of the present application, the present application provides a thermal management system, which is applied to a battery 10 , and the thermal management system includes a heat exchange device 13 , a compressor, and a condenser.

[0092] According to some embodiments of the present application, Figure 3-Figure 7 As shown, the present application also provides a heat exchange device 13, which is applied to the battery 10. Figure 5 It may also be a structural schematic diagram of the first flow channel plate 132 provided in the embodiment of the present application. To facilitate the understanding of the first heat exchange flow channel 1322, the first heat exchange flow channel 1322 that can be formed by the first flow channel plate 132 is marked and described; Figure 6It can also be a structural schematic diagram of the second flow channel plate 133 provided in the embodiment of the present application. To facilitate the understanding of the second heat exchange flow channel 1332, the second heat exchange flow channel 1332 that can be formed by the second flow channel plate 133 is marked and described.

[0093] The heat exchange device 13 includes a heat exchange body, which is formed with a first heat exchange channel 1322 and a second heat exchange channel 1332. The heat exchange device 13 also includes an expansion valve 134, the inlet end of the expansion valve 134 is connected to the outlet end of the first heat exchange channel 1322, and the outlet end of the expansion valve 134 is connected to the inlet end of the second heat exchange channel 1332. The inlet end of the compressor is connected to the outlet end of the second heat exchange channel 1332, the inlet end of the condenser is connected to the outlet end of the compressor, and the outlet end of the condenser is connected to the inlet end of the first heat exchange channel 1322.

[0094] To facilitate understanding of the technical solution, the circulation path and state changes of the heat exchange medium between various components are explained starting from the inlet end of the compressor:

[0095] 1) The gaseous heat exchange medium enters the compressor from the inlet end, is compressed by the compressor and becomes a high-temperature and high-pressure gaseous heat exchange medium, and flows out from the outlet end of the compressor;

[0096] 2) The high-temperature and high-pressure gaseous heat exchange medium flows into the condenser from the inlet end of the condenser, and the heat exchange medium is condensed and liquefied through the condenser, so that the heat exchange medium is transformed from a high-temperature and high-pressure gaseous state to a high-pressure liquid state, and the temperature of the heat exchange medium is reduced to a certain extent, and then flows out from the outlet end of the condenser;

[0097] 3) The high-temperature and high-pressure liquid heat exchange medium enters the first heat exchange channel 1322 from the inlet end of the first heat exchange channel 1322 and flows out from the outlet end of the first heat exchange channel 1322;

[0098] 4) The high-temperature and high-pressure liquid heat exchange medium enters the expansion valve 134 from the inlet section of the expansion valve 134. When passing through the expansion valve 134, the heat exchange medium expands rapidly, and the temperature and pressure decrease and change into a two-phase state of gas-liquid mixture, and flows out from the outlet end of the expansion valve 134;

[0099] 5) The low-temperature and low-pressure two-phase heat exchange medium enters the second heat exchange flow channel 1332 from the inlet section of the second heat exchange flow channel 1332, exchanges heat with the battery cell 12 in the second heat exchange flow channel 1332, absorbs heat and gasifies during this process, and gradually changes from a gas-liquid mixed two-phase state to a saturated gas state, and the low-temperature and low-pressure gaseous heat exchange medium flows out from the outlet end of the second heat exchange flow channel 1332;

[0100] 6) The low-temperature and low-pressure gaseous heat exchange medium circulates back to the inlet of the compressor, completing a cycle.

[0101] In this embodiment, the second heat exchange flow channel 1332 includes an upstream flow channel and a downstream flow channel connected in sequence, wherein the upstream flow channel is connected to the outlet end of the expansion valve 134, the upstream flow channel is used to exchange heat with the battery cell 12, and the downstream flow channel is used to exchange heat with the first heat exchange flow channel 1322. Figure 6 As shown, the second heat exchange channel 1332 is Figure 6 The area indicated by A is the upstream flow channel. Figure 6 The area indicated by B is the downstream flow channel.

[0102] After the heat exchange medium enters the second heat exchange channel 1332 from the expansion valve 134, it first flows through the upstream channel and then flows through the downstream channel, so that the heat exchange medium in the upstream channel is in a two-phase state of gas-liquid mixture. Through the upstream channel, heat is exchanged with the battery cell 12, the latent heat of the heat exchange medium increases, and the sensible heat remains basically unchanged, so that the heat exchange capacity of the heat exchange medium is stable, the temperature is uniform, and the heat exchange effect on the battery cells 12 at various positions is uniform.

[0103] When flowing to the downstream flow channel, the heat exchange medium has been completely transformed into gaseous saturated steam. At this time, if the heat exchange medium continues to absorb heat, the sensible heat will increase rapidly, the temperature changes quickly, and the heat exchange effect at different positions is poor. Therefore, the downstream flow channel is not used to exchange heat with the battery cell 12 to improve the overall temperature uniformity and usage stability.

[0104] It can be understood that although the heat exchange medium in the downstream flow channel has been completely transformed into a gaseous state, it is still in a low temperature and low pressure state.

[0105] In this embodiment, the downstream flow channel is used to exchange heat with the first heat exchange flow channel 1322. By exchanging heat with the first heat exchange flow channel 1322 through the downstream flow channel, on the one hand, when the heat exchange medium in the downstream flow channel is not suitable for exchanging heat with the battery cell 12, the residual cold capacity of the heat exchange medium in the downstream flow channel can be used to reduce the temperature of the high-temperature and high-pressure liquid heat exchange medium in the first heat exchange flow channel 1322, and the heat exchange medium is cooled before entering the expansion valve 134, so that the temperature of the heat exchange medium after passing through the expansion valve 134 is lower, the heat exchange effect of the upstream flow channel is better, and the energy utilization efficiency is improved; on the other hand, the temperature of the high-temperature heat exchange medium in the first heat exchange flow channel 1322 can be used to heat the heat exchange medium in the downstream flow channel, so that the heat exchange medium in the downstream flow channel can fully absorb heat and vaporize, and the heat exchange medium can be fully vaporized before returning to the compressor, thereby protecting the compressor and improving the stability and durability of the heat exchange system.

[0106] According to the heat exchange device 13 provided in the embodiment of the present application, the heat exchange medium in the upstream flow channel is in a two-phase state, and heat is exchanged with the battery cell 12 through the upstream flow channel, so that the temperature uniformity is better and the heat exchange effect is better. The heat exchange medium in the downstream flow channel is in a gas phase state, and the residual cold capacity of the heat exchange medium in the downstream flow channel is used to exchange heat with the first heat exchange flow channel 1322 to reduce the temperature in front of the expansion valve 134, thereby making the temperature of the heat exchange medium after passing through the expansion valve 134 lower, thereby improving the heat exchange effect of the upstream flow channel on the battery cell 12 and the overall energy utilization efficiency.

[0107] The heat exchange system provided according to the embodiment of the present application includes, in addition to the technical effects of the above-mentioned heat exchange device 13, by using the heat exchange device 13 as described above, the durability of the compressor and the thermal management effect of the battery 10 are improved.

[0108] According to some embodiments of the present application, Figure 3-Figure 6 As shown, the heat exchange body may include a heat exchange plate 131 , a first flow channel plate 132 and a second flow channel plate 133 .

[0109] The heat exchange plate 131 may have a first surface 1311 and a second surface 1312 that are arranged opposite to each other in the thickness direction thereof, the first flow channel plate 132 may be covered on the first surface 1311, and the first flow channel plate 132 may define a first heat exchange flow channel 1322 with the first surface 1311; the second flow channel plate 133 may be covered on the second surface 1312, and the second flow channel plate 133 may define a second heat exchange flow channel 1332 with the second surface 1312, and the area on the first surface 1311 corresponding to the upstream flow channel is used for heat exchange of the battery cell 12, and the first heat exchange flow channel 1322 exchanges heat with the downstream flow channel through the heat exchange plate 131. The first flow channel plate 132, the second flow channel plate 133 and the heat exchange plate 131 may be brazed with steel plates to form an integral body, which is simple to produce and process, thin in thickness, small in space occupied and good in heat exchange effect.

[0110] The first flow channel plate 132 may be provided with a first groove 1321 that is recessed in a direction away from the heat exchange plate 131, and the first groove 1321 and the first surface 1311 define a first heat exchange flow channel 1322. The second flow channel plate 133 may be provided with a second groove 1331 that is recessed in a direction away from the heat exchange plate 131, and the second groove 1331 and the second surface 1312 define a second heat exchange flow channel 1332. The heat exchange plate 131 may be provided with a plane in the area of ​​the first surface 1311 that is away from the upstream flow channel, so as to facilitate the contact and heat exchange of the battery cell 12 and facilitate the installation of the battery cell 12.

[0111] The first heat exchange channel 1322 exchanges heat with the downstream channel through the heat exchange plate 131, so that the heat exchange medium in the first heat exchange channel 1322 exchanges heat with the heat exchange medium in the downstream channel.

[0112] According to the embodiment of the present application, by providing the heat exchange plate 131 , the first flow channel plate 132 and the second flow channel plate 133 , the assembly is simple, the production efficiency is high, the occupied space is small and the heat exchange effect is good.

[0113] According to some embodiments of the present application, Figure 3-Figure 6 As shown, the upstream flow channel and the downstream flow channel can be arranged in sequence in the length direction of the heat exchange plate 131, and the first heat exchange flow channel 1322 and the downstream flow channel can be arranged back to back on both sides in the thickness direction of the heat exchange plate 131.

[0114] The upstream flow channel and the downstream flow channel are sequentially arranged in the length direction of the heat exchange plate 131 to facilitate the corresponding installation of the first flow channel plate 132 and optimize the flow channel layout.

[0115] It can be understood that the back-to-back setting means that the area covered by the first heat exchange channel 1322 on the first surface 1311 corresponds to the area covered by the downstream channel on the second surface 1312, and does not mean that the flow path of the first heat exchange channel 1322 and the flow path of the downstream channel are completely consistent. However, the flow path of the first heat exchange channel 1322 and the flow path of the downstream channel are at least partially corresponding to each other to improve the heat exchange effect between the first heat exchange channel 1322 and the downstream channel.

[0116] According to some embodiments of the present application, Figure 3-Figure 6 As shown, the heat exchange plate 131 may include a first heat exchange zone and a second heat exchange zone distributed along the length direction of the heat exchange plate 131, the first heat exchange channel 1322 and the downstream channel may be respectively located on two sides of the first heat exchange zone, and the upstream channel may be located in the second heat exchange zone, wherein the length direction of the first heat exchange zone may extend along the width direction of the heat exchange plate 131.

[0117] In this embodiment, by dividing the heat exchange plate 131 into a first heat exchange area and a second heat exchange area distributed along the length direction of the heat exchange plate 131 , the area division is clear and the space utilization rate is high, which is convenient for installation layout when assembled with the battery cell 12 .

[0118] The first surface 1311 of the first heat exchange zone of the heat exchange plate 131 and the first flow channel plate 132 form a first heat exchange channel 1322, the second surface 1312 of the first heat exchange zone of the heat exchange plate 131 and the second flow channel plate 133 form a downstream channel, and the second surface 1312 of the second heat exchange zone of the heat exchange plate 131 and the second flow channel plate 133 form an upstream channel.

[0119] The first heat exchange zone can be used for heat exchange between the first heat exchange channel 1322 and the downstream channel, and the second heat exchange zone can be used for heat exchange between the upstream channel and the battery cell 12. The length direction of the first heat exchange zone extends along the width direction of the heat exchange plate 131, and the length direction of the heat exchange plate 131 intersects with the width direction of the heat exchange plate 131, so as to reduce the space occupied by the first heat exchange zone in the length direction of the heat exchange plate 131, and facilitate the arrangement of multiple battery cells 12 in the second heat exchange zone.

[0120] According to the embodiment of the present application, the first heat exchange zone is arranged on one side of the heat exchange plate 131 in the length direction of the heat exchange plate 131, so as to facilitate the arrangement of the battery cells 12 in the second heat exchange zone and reduce the influence of the first heat exchange channel 1322 on the arrangement of the battery cells 12.

[0121] According to some embodiments of the present application, Figure 4 and Figure 6 As shown, the inlet end of the second heat exchange channel 1332 can be arranged close to the first side in the width direction of the heat exchange plate 131, and the end where the upstream channel is connected to the downstream channel can be arranged close to the second side in the width direction of the heat exchange plate 131, and the inlet end of the second heat exchange channel 1332 and the end where the upstream channel is connected to the downstream channel are both arranged close to the first heat exchange zone; the outlet end of the second heat exchange channel 1332 is arranged close to the first side in the width direction of the heat exchange plate 131, the downstream channel extends along the width direction of the heat exchange plate 131, and the end of the downstream channel close to the second side in the width direction of the heat exchange plate 131 is connected to the upstream channel by a bend.

[0122] In this embodiment, the inlet end of the second heat exchange channel 1332 and the end where the upstream channel is connected to the downstream channel are respectively arranged on the first side and the second side in the width direction of the heat exchange plate, so that the overall flow direction of the heat exchange medium in the upstream channel flows along the first side in the width direction of the heat exchange plate to the second side in the width direction of the heat exchange plate. For example, the upstream channel can be as follows: Figure 6 The bending type setting shown in the figure is used to increase the coverage area of ​​the upstream flow channel in the first heat exchange zone. In other examples, the upstream flow channel can also be bent in other ways, which is not limited here.

[0123] In this embodiment, the inlet end of the second heat exchange channel 1332 and one end connecting the upstream channel and the downstream channel are both arranged on the side of the first heat exchange zone close to the second heat exchange zone to facilitate the connection between the upstream channel and the downstream channel.

[0124] Furthermore, the downstream flow channel may extend along the width direction of the heat exchange plate 131. For example, Figure 6The overall flow direction of the middle and downstream flow channels is linear, which reduces the space occupied by the downstream flow channels, wherein one end of the downstream flow channel close to the second side in the width direction of the heat exchange plate 131 is connected to the upstream flow channel in a bend, and the outlet end of the second heat exchange flow channel 1332 is arranged close to the first side in the width direction of the heat exchange plate 131, so that the inlet end of the second heat exchange flow channel 1332 and the outlet end of the second heat exchange flow channel 1332 are arranged close to each other, which facilitates the centralized arrangement of pipe joints and optimizes the spatial layout.

[0125] According to some embodiments of the present application, Figure 4 As shown, the inlet and outlet ends of the first heat exchange channel 1322 may both be located on the first channel plate 132 , and the inlet and outlet ends of the second heat exchange channel 1332 may both be located on the first surface 1311 .

[0126] Two through holes may be provided on the surface of the first flow channel plate 132 facing away from the heat exchange plate 131. The two through holes on the first flow channel plate 132 are respectively a first inlet 1323 and a first outlet 1324. The first inlet 1323 forms an inlet end of the first heat exchange flow channel 1322, and the first outlet 1324 forms an outlet end of the first heat exchange flow channel 1322. Moreover, the first inlet 1323 and the first outlet 1324 are both arranged close to the first side in the width direction of the heat exchange plate 131.

[0127] Two through holes may also be provided on the heat exchange plate 131, and the through holes may connect the first surface 1311 and the second surface 1312 of the heat exchange plate 131. The two through holes on the heat exchange plate 131 are respectively the second inlet 1313 and the second outlet 1314. The second inlet 1313 may form the inlet end of the second heat exchange channel 1332, and the second outlet 1314 may form the outlet end of the second heat exchange channel 1332. The two through holes on the heat exchange plate 131 are staggered with the first channel plate 132 to facilitate pipeline connection.

[0128] According to the embodiment of the present application, by arranging the inlet and outlet ends of the first heat exchange channel 1322 and the second heat exchange channel 1332 on the same side of the heat exchange plate 131, it is convenient to arrange the pipe joints and connect the pipes.

[0129] According to some embodiments of the present application, Figure 3 , Figure 4 and Figure 7 As shown, the expansion valve 134 can be installed on the first surface 1311.

[0130] In this embodiment, the expansion valve 134 is installed on the first surface 1311 of the heat exchange plate 131 so that the expansion valve 134 is integrated on the surface of the heat exchange plate 131, thereby shortening the distance between the outlet end of the expansion valve 134 and the inlet end of the second heat exchange channel 1332. After the heat exchange medium flows out of the expansion valve 134, it directly enters the upstream channel, thereby reducing energy loss and achieving a better heat exchange effect.

[0131] According to the embodiment of the present application, the expansion valve 134 is integrated on the heat exchange plate 131 to reduce the distance between the expansion valve 134 and the second heat exchange channel 1332 and improve the heat exchange effect.

[0132] In other embodiments, the expansion valve 134 can be installed inside or outside the box body 11, and the inlet end of the expansion valve 134 is connected to the outlet end of the first heat exchange channel 1322 through a pipeline, and the outlet end of the expansion valve 134 is connected to the inlet end of the second heat exchange channel 1332 through a pipeline, so as to facilitate the installation and arrangement of the heat exchange device 13, optimize the internal space design of the box body 11, and facilitate the integral brazing of the heat exchange plate 131, the first channel plate 132 and the second channel plate 133.

[0133] According to some embodiments of the present application, Figure 4 and Figure 6 As shown, a plurality of branch channels may be connected in parallel between the inlet and outlet ends of the second heat exchange channel 1332, and the branch channels include a first branch channel 13321 belonging to the upstream channel and a second branch channel 13322 belonging to the downstream channel.

[0134] In this embodiment, the second heat exchange channel 1332 is composed of a plurality of branch channels, and the plurality of branch channels are arranged in parallel. By setting a plurality of branch channels, the flow distance of the heat exchange medium between the inlet and outlet of the second heat exchange channel 1332 can be shortened under the same total heat exchange area to improve the heat exchange effect. The number of branch channels is not limited here, and can be two, three, four or more than four, which is determined according to various parameters. For example, Figure 6 There are four tributaries.

[0135] According to some embodiments of the present application, Figure 6 As shown, the distance between two adjacent first branch channels 13321 may be greater than the distance between two adjacent second branch channels 13322 .

[0136] In this embodiment, the coverage area of ​​the upstream channel is increased by increasing the distance between two adjacent first branch channels 13321, and the coverage area of ​​the downstream channel is reduced by reducing the distance between two adjacent second branch channels 13322, thereby optimizing the spatial layout and improving the heat exchange efficiency and effect.

[0137] According to some embodiments of the present application, Figure 6As shown, the first branch channel 13321 may include a plurality of first sub-segments 13321a and second sub-segments 13321b connected in sequence, the first sub-segment 13321a extends along the length direction of the heat exchange body, the plurality of first sub-segments 13321a are spaced apart along the width direction of the heat exchange body, the second sub-segment 13321b extends along the width direction of the heat exchange body, the first first sub-segment 13321a is connected to the outlet end of the expansion valve 134, one end of two adjacent first sub-segments 13321a is connected through the second sub-segment 13321b, and the last first sub-segment 13321a is connected to the inlet end of the second branch channel 13322.

[0138] In this embodiment, the first branch flow channel 13321 is arranged in a circuitous shape, which optimizes the flow channel layout, facilitates the connection between the flow channels and effectively covers the heat exchange area.

[0139] According to some embodiments of the present application, the number of the first sub-segments 13321a may be N, the number of the second sub-segments 13321b may be N-1, N may be an even number, and N≥2. By setting N≥2, the first branch channel 13321 is arranged to bend at least once, so as to increase the coverage area of ​​the first branch channel 13321 and to cover the heat exchange area with the battery cell. For example, Figure 6 In the embodiment, the number of the first sub-segments 13321a can be 4, the number of the second sub-segments 13321b can be 3, and the first branch channel 13321 meanders three times.

[0140] According to some embodiments of the present application, Figure 6 As shown, the second branch channel 13322 includes a main section 13322a extending along the width direction of the heat exchange body and a connecting section 13322b extending along the length direction of the heat exchange body, one end of the connecting section 13322b is connected to the first branch channel 13321, the other end of the connecting section 13322b is connected to one end of the main section 13322a, and the other end of the main section 13322a is connected to the outlet end of the second heat exchange channel 1332.

[0141] In this embodiment, multiple main sections 13322a are distributed along the length direction of the heat exchange body. The main section 13322a extending along the width direction of the heat exchange body is set to minimize the space occupied by the downstream flow channel, and the connecting section 13322b is set to facilitate connection with the first branch flow channel 13321.

[0142] According to some embodiments of the present application, Figure 4 and Figure 5As shown, the first heat exchange channel 1322 includes a plurality of first sub-channels 13221 extending along the width direction of the heat exchange body and distributed along the length direction of the heat exchange body. The plurality of first sub-channels 13221 are connected end to end, and the first sub-channels 13221 correspond to the main section 13322a of the second branch channel 13322.

[0143] In this embodiment, the first heat exchange channel 1322 may include a plurality of first sub-channels 13221 extending along the width direction of the heat exchange body and distributed along the length direction of the heat exchange body. The plurality of first sub-channels 13221 are connected end to end along the flow direction and are connected in series to form the first heat exchange channel 1322. By setting the plurality of first sub-channels 13221 connected in series, the flow length of the first heat exchange channel 1322 is extended, the heat exchange effect of the first heat exchange channel 1322 is improved, and the temperature of the heat exchange medium passing through the first heat exchange channel 1322 is reduced as much as possible.

[0144] In some embodiments, Figure 4-Figure 6 As shown, the number of first sub-channels 13221 can be the same as the number of branch channels 13321, wherein multiple first sub-channels 13221 can be made to correspond one-to-one with the main sections 13322a of multiple second branch channels 13322, thereby improving the heat exchange effect between the first heat exchange channel 1322 and the downstream channel.

[0145] According to some embodiments of the present application, the flow area of ​​each branch channel can be the same, and the flow area of ​​the first branch channel 13321 and the second branch channel 13322 in a single branch channel can be the same, so that the flow rate of the heat exchange medium in each branch channel is relatively uniform, thereby improving the uniformity of heat exchange.

[0146] In this embodiment, the width of the branch channel can be 6mm-10mm, specifically, the width of the branch channel can be 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm or other values ​​between 6mm-10mm. The height of the branch channel can be 2mm-4mm, specifically, the height of the branch channel can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm or other values ​​between 2mm-4mm. The wall thickness of the branch channel can be 1mm-2mm, specifically, the wall thickness of the branch channel can be 1mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 2mm or other values ​​between 1mm-2mm.

[0147] According to some embodiments of the present application, Figure 6As shown, the second heat exchange channel 1332 also includes a first convergence channel 13323 and a second convergence channel 13324, the ends of multiple branch channels are connected in parallel between the first convergence channel 13323 and the second convergence channel 13324, the inlet end of the second heat exchange channel 1332 is arranged at the first convergence channel 13323, and the outlet end of the second heat exchange channel 1332 is arranged at the second convergence channel 13324.

[0148] By providing the first confluence channel 13323 and the second confluence channel 13324, the ends of the branch channels are interconnected, so as to centrally distribute the heat exchange medium in the branch channels. Figure 6 In the figure, the first confluence channel 13323 extends along the width direction of the heat exchange body so as to facilitate the connection between the first confluence channel 13323 and the first first sub-segment 13321a of each first branch channel 13321, and the second confluence channel 13324 extends along the length direction of the heat exchange body so as to facilitate the connection between the second confluence channel 13324 and the main segment 13322a of each second branch channel 13322.

[0149] According to some embodiments of the present application, Figure 6 As shown, the inlet end of the second heat exchange channel 1332 can be located between 1 / 4 and 3 / 4 of the length direction of the first confluence channel 13323, and the outlet end of the second heat exchange channel 1332 can be located between 1 / 4 and 3 / 4 of the length direction of the second confluence channel 13324.

[0150] By setting the inlet end of the second heat exchange channel 1332 between 1 / 4 and 3 / 4 of the length of the first confluence channel 13323, the heat exchange medium can be relatively evenly distributed to multiple branch channels after entering the first confluence channel 13323, thereby improving the uniformity of the heat exchange medium flow in each branch channel. By setting the outlet end of the second heat exchange channel 1332 between 1 / 4 and 3 / 4 of the length of the second confluence channel 13324, the heat exchange medium in each branch channel can flow out, and the flow resistance of each branch channel can be reasonably distributed, thereby improving uniformity.

[0151] For example, in Figure 6 In the embodiment, the first subsection 13321a of the first branch channel 13321 is provided with four arranged along the width direction of the heat exchange body, the inlet end of the second heat exchange channel 1332 corresponds to the third first subsection 13321a, the main body end 13322a of the second branch channel 13322 is provided with four arranged along the length direction of the heat exchange body, the outlet end of the second heat exchange channel 1332 corresponds to the third main body section 13322a, and the third main body section 13322a and the third first subsection 13321a belong to the same branch channel. According to some embodiments of the present application, such as Figure 5As shown, the flow area of ​​the first heat exchange channel 1322 near the outlet end may be greater than the flow area of ​​the first heat exchange channel 1322 near the inlet end.

[0152] In this embodiment, by changing the flow area of ​​the first heat exchange channel 1322, when the heat exchange medium flows from the inlet end to the outlet end in the first heat exchange channel 1322, the pressure is reduced due to the increase in the flow area, so that the heat exchange medium expands slightly to a certain extent before entering the expansion valve 134, thereby improving the expansion effect of the subsequent heat exchange medium when passing through the expansion valve 134, thereby improving the heat exchange effect.

[0153] Among them, the outlet end of the first heat exchange channel 1322 is arranged in the first sub-channel 13221 close to one end of the second heat exchange zone among the multiple first sub-channels 13221. By setting the flow area of ​​the first sub-channel 13221 close to one end of the second heat exchange zone to be larger than that of other first sub-channels 13221, the heat exchange medium expands when flowing through the first sub-channel 13221 close to one end of the second heat exchange zone.

[0154] According to some embodiments of the present application, the heat exchange body may include a first flow channel tube and a second flow channel tube.

[0155] A first heat exchange channel 1322 may be formed in the first channel tube, and a second heat exchange channel 1332 may be formed in the second channel tube. The second channel tube is arranged on one side of the first channel tube in the thickness direction. The part of the second channel tube corresponding to the downstream channel exchanges heat with the first channel tube, and the part of the second channel tube corresponding to the upstream channel is used for heat exchange for the battery cell on the side facing the first channel tube.

[0156] In this embodiment, the first flow channel tube and the second flow channel tube can be formed by extruding and bending or splicing aluminum profiles, and the first flow channel tube and the second flow channel tube are assembled into a heat exchange body by welding or bolting. The production efficiency is high, the structural strength is high, and the arrangement is flexible.

[0157] According to some embodiments of the present application, the present application also provides a battery 10, which includes a case 11, multiple battery cells 12 and a thermal management system of any of the above schemes, the multiple battery cells 12 are installed in the case 11, and the thermal management system is installed in the case 11 for exchanging heat with the multiple battery cells 12.

[0158] It should be noted that, in this embodiment, the first heat exchange channel 1322 and the downstream channel of the heat exchange device 13 can be arranged inside the box body 11 or outside the box body 11, and there is no specific limitation.

[0159] By using any of the above technical solutions in the thermal management system of the battery 10 , the working stability of the battery cells 12 and the battery 10 is improved.

[0160] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 10 of any of the above schemes, and the battery 10 is used to provide electrical energy to the electrical device.

[0161] The electric device may be any of the above-mentioned devices or systems using the battery 10. By using the battery 10 of any of the above solutions, the working stability of the electric device is higher.

[0162] According to some embodiments of the present application, see Figure 3-Figure 7 As shown, the present application provides a heat exchange device 13 , which includes a heat exchange plate 131 , a first flow channel plate 132 , a second flow channel plate 133 and an expansion valve 134 .

[0163] The heat exchange plate 131 has a first surface 1311 and a second surface 1312 that are opposite to each other in the thickness direction thereof.

[0164] The first flow channel plate 132 is covered on the first surface 1311, and the first flow channel plate 132 is provided with a first groove 1321 recessed in a direction away from the heat exchange plate 131, the first groove 1321 and the first surface 1311 define a first heat exchange flow channel 1322, and a first inlet 1323 and a first outlet 1324 are provided on the surface of the first flow channel plate 132 away from the heat exchange plate 131, the first inlet 1323 forms an inlet end of the first heat exchange flow channel 1322, and the first outlet 1324 forms an outlet end of the first heat exchange flow channel 1322.

[0165] The second flow channel plate 133 is covered on the second surface 1312, and the second flow channel plate 133 is provided with a second groove 1331 recessed along the direction away from the heat exchange plate 131, the second groove 1331 and the second surface 1312 define a second heat exchange flow channel 1332, and the heat exchange plate 131 is provided with a second inlet 1313 and a second outlet 1314, the second inlet 1313 forms an inlet end of the second heat exchange flow channel 1332, and the second outlet 1314 forms an outlet end of the second heat exchange flow channel 1332.

[0166] Among them, the second heat exchange channel 1332 includes an upstream channel and a downstream channel connected in sequence from the inlet end to the outlet end of the second heat exchange channel 1332, and the area corresponding to the upstream channel of the first surface 1311 of the heat exchange plate 131 is used to exchange heat for the battery cell 12, and the part of the downstream channel is opposite to the first heat exchange channel 1322 in the thickness direction of the heat exchange plate 131.

[0167] The expansion valve 134 is installed on the first surface 1311 of the heat exchange plate 131 , and the inlet end of the expansion valve 134 is connected to the first outlet 1324 , and the outlet end of the expansion valve 134 is connected to the second inlet 1313 .

[0168] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0169] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A heat exchange device, applied to a battery, characterized in that: include: A heat exchange body is formed with a first heat exchange flow channel and a second heat exchange flow channel; an expansion valve, wherein the inlet end of the expansion valve is connected to the outlet end of the first heat exchange channel, and the outlet end of the expansion valve is connected to the inlet end of the second heat exchange channel; The second heat exchange channel comprises an upstream channel and a downstream channel connected in sequence, the upstream channel is connected to the outlet end of the expansion valve, the upstream channel is used for heat exchange with the battery cell, and the downstream channel is used for heat exchange with the first heat exchange channel.

2. The heat exchange device according to claim 1, characterized in that: The heat exchange body comprises: The heat exchange plate has a first surface and a second surface which are arranged opposite to each other; A first flow channel plate, which is covered on the first surface, and the first flow channel plate and the first surface define the first heat exchange flow channel; The second flow channel plate is covered on the second surface, the second flow channel plate and the second surface define the second heat exchange flow channel, and the area on the first surface corresponding to the upstream flow channel is used for heat exchange with the battery cell, and the first heat exchange flow channel and the downstream flow channel exchange heat through the heat exchange plate.

3. The heat exchange device according to claim 2, characterized in that: The upstream flow channel and the downstream flow channel are sequentially arranged in the length direction of the heat exchange plate, and the first heat exchange flow channel and the downstream flow channel are arranged back to back on both sides in the thickness direction of the heat exchange plate.

4. The heat exchange device according to claim 3, characterized in that: The heat exchange plate includes a first heat exchange zone and a second heat exchange zone distributed along the length direction of the heat exchange plate, the first heat exchange flow channel and the downstream flow channel are respectively located on two sides of the first heat exchange zone, and the upstream flow channel is located in the second heat exchange zone, wherein the length direction of the first heat exchange zone extends along the width direction of the heat exchange plate.

5. The heat exchange device according to claim 4, characterized in that: The inlet end of the second heat exchange channel is arranged close to the first side in the width direction of the heat exchange plate, the end of the upstream channel connected to the downstream channel is arranged close to the second side in the width direction of the heat exchange plate, and the end of the upstream channel connected to the downstream channel and the inlet end of the second heat exchange channel are both arranged close to the first heat exchange area; The outlet end of the second heat exchange channel is arranged close to the first side in the width direction of the heat exchange plate, the downstream channel extends along the width direction of the heat exchange plate, and one end of the downstream channel close to the second side in the width direction of the heat exchange plate is bent and connected to the upstream channel.

6. The heat exchange device according to claim 2, characterized in that: The inlet and outlet ends of the first heat exchange channel are both located on the first channel plate, and the inlet and outlet ends of the second heat exchange channel are both located on the first surface.

7. The heat exchange device according to claim 6, characterized in that: The expansion valve is mounted on the first surface.

8. The heat exchange device according to any one of claims 1 to 7, characterized in that: A plurality of branch channels are connected in parallel between the inlet and outlet ends of the second heat exchange channel, and the branch channels include a first branch channel belonging to the upstream channel and a second branch channel belonging to the downstream channel.

9. The heat exchange device according to claim 8, characterized in that: The distance between two adjacent first branch flow channels is greater than the distance between two adjacent second branch flow channels.

10. The heat exchange device according to claim 8, characterized in that: The first branch channel includes a plurality of first sub-segments and second sub-segments connected in sequence, the first sub-segments extend along the length direction of the heat exchange body, the plurality of first sub-segments are spaced apart along the width direction of the heat exchange body, the second sub-segments extend along the width direction of the heat exchange body, the first first sub-segment is connected to the outlet end of the expansion valve, one ends of two adjacent first sub-segments are connected through the second sub-segment, and the last first sub-segment is connected to the inlet end of the second branch channel.

11. The heat exchange device according to claim 10, characterized in that: The number of the first sub-segments is N, the number of the second sub-segments is N-1, N is an even number, and N≥2.

12. The heat exchange device according to claim 8, characterized in that: The second branch channel includes a main section extending along the width direction of the heat exchange body and a connecting section extending along the length direction of the heat exchange body, one end of the connecting section is connected to the first branch channel, the other end of the connecting section is connected to one end of the main section, and the other end of the main section is connected to the outlet end of the second heat exchange channel.

13. The heat exchange device according to claim 12, characterized in that: The first heat exchange channel includes a plurality of first sub-channels extending along the width direction of the heat exchange body and distributed along the length direction of the heat exchange body. The plurality of first sub-channels are connected end to end, and the first sub-channels correspond to the main body section of the second branch channel.

14. The heat exchange device according to claim 8, characterized in that: The flow areas of the branch channels are the same.

15. The heat exchange device according to claim 8, characterized in that: The second heat exchange channel also includes a first confluence channel and a second confluence channel, the ends of the plurality of branch channels are connected in parallel between the first confluence channel and the second confluence channel, the inlet end of the second heat exchange channel is arranged at the first confluence channel, and the outlet end of the second heat exchange channel is arranged at the second confluence channel.

16. The heat exchange device according to claim 15, characterized in that: The inlet end of the second heat exchange channel is located between 1 / 4 and 3 / 4 of the length of the first confluence channel, and the outlet end of the second heat exchange channel is located between 1 / 4 and 3 / 4 of the length of the second confluence channel.

17. The heat exchange device according to any one of claims 1 to 7, characterized in that: The flow area of ​​the first heat exchange channel near the outlet end is greater than the flow area of ​​the first heat exchange channel near the inlet end.

18. The heat exchange device according to claim 1, characterized in that: The heat exchange body comprises: a first flow channel tube, wherein the first heat exchange flow channel is formed in the first flow channel tube; A second flow channel tube, in which the second heat exchange flow channel is formed, the second flow channel tube is arranged on one side of the first flow channel tube in the thickness direction, the portion of the second flow channel tube corresponding to the downstream flow channel exchanges heat with the first flow channel tube, and the portion of the second flow channel tube corresponding to the upstream flow channel is used for exchanging heat with the battery cell on the side facing the first flow channel tube.

19. A heat exchange system, applied to a battery, characterized in that: The heat exchange system comprises: The heat exchange device according to any one of claims 1 to 18; A compressor, wherein an inlet end of the compressor is connected to an outlet end of the second heat exchange flow channel; A condenser, wherein the inlet end of the condenser is connected to the outlet end of the compressor, and the outlet end of the condenser is connected to the inlet end of the first heat exchange channel.

20. A battery, characterized in that: include: Box; A plurality of battery cells, wherein the plurality of battery cells are installed in the box; The heat exchange system as claimed in claim 19, wherein the heat exchange system is installed in the box and is used to exchange heat with the plurality of battery cells.

21. An electrical device, characterized in that: include: The battery as claimed in claim 20, wherein the battery is used to power the electrical device.

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