Battery thermal management system and electric equipment

Abstract

The utility model relates to a battery thermal management system and electric equipment, the battery thermal management system comprises a liquid flow plate, a battery cell, an insulation heat conduction glue layer and an insulation strip, and the liquid flow plate is internally provided with a heat conduction working medium flow channel; the plurality of battery cells are arranged on the liquid flow plate; the insulating heat-conducting glue layer is connected between the battery cell and the liquid flow plate; the plurality of insulating strips are embedded in the insulating heat-conducting glue layer in parallel and are arranged between the battery cell and the liquid flow plate, so that a preset distance exists between the battery cell and the liquid flow plate. According to the insulating strip of the battery thermal management system, the preset distance is formed between the battery cell and the liquid flow plate, so that the bottom of the battery cell is prevented from being in direct contact with the liquid flow plate before glue of the insulating heat-conducting glue layer is cured. And after the insulating heat-conducting glue layer is cured, the gap between the battery cell and the liquid flow plate can be filled through the insulating heat-conducting glue layer to realize uniform heat transfer, and the conditions of poor insulation and electric leakage of the system in the assembly process due to direct contact between the bottom of the battery cell and the surface of the liquid flow plate can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery thermal management system and a power consumption device. BACKGROUND

[0002] In the use process of the power battery, the temperature of the battery cell in the battery pack has a great influence on the use performance of the battery. When the battery cell is overheated, the battery cell will rapidly age. When the battery cell is overheated and causes a thermal runaway phenomenon, the battery may even explode. When the battery cell is too cold, the electrochemical reaction in the battery will slow down or stop, causing the battery system to malfunction.

[0003] In the prior art, a liquid flow plate is arranged at the bottom of the battery cell to conduct heat. When the battery cell is overheated, low-temperature heat-conducting medium is introduced into the liquid flow plate to reduce the temperature of the battery cell through heat conduction between the battery cell and the liquid flow plate. When the battery cell is too cold, high-temperature heat-conducting medium is introduced into the liquid flow plate to increase the temperature of the battery cell through heat conduction between the battery cell and the liquid flow plate. Thus, the phenomenon of overheating or overcooling of the battery cell is avoided.

[0004] However, since the liquid flow plate is usually made of copper-based heat-conducting material, when the battery cell and the liquid flow plate are assembled, insulation failure and system leakage may occur due to direct contact between the battery cell and the liquid flow plate. Therefore, how to achieve heat conduction between the battery cell and the liquid flow plate while avoiding insulation failure and system leakage has become a problem to be solved. Invention content

[0005] The present application provides a battery thermal management system and a power consumption device to solve the technical problem of achieving heat conduction between the battery cell and the liquid flow plate while avoiding insulation failure and system leakage.

[0006] In a first aspect, the present application provides a battery thermal management system, comprising:

[0007] a liquid flow plate, the inside of the liquid flow plate being provided with a heat-conducting medium flow channel;

[0008] a battery cell, a plurality of battery cells being arranged on the liquid flow plate;

[0009] an insulating heat-conducting adhesive layer, the insulating heat-conducting adhesive layer being connected between the battery cell and the liquid flow plate;

[0010] an insulating strip, a plurality of insulating strips being embedded in parallel in the insulating heat-conducting adhesive layer, the insulating strip being arranged between the battery cell and the liquid flow plate, so that a predetermined distance exists between the battery cell and the liquid flow plate.

[0011] Optionally, a plurality of rows of battery cells are arranged in parallel on the liquid flow plate, and the bottom of any row of battery cells is provided with an insulating strip extending along the arrangement direction thereof.

[0012] Optionally, the insulating strip is made of a heat-conductive material.

[0013] Optionally, the liquid flow plate comprises a liquid inlet and a liquid outlet, one end of the heat-conductive working medium flow channel is in communication with the liquid inlet, and the other end of the heat-conductive working medium flow channel is in communication with the liquid outlet.

[0014] The heat-conductive working medium flow channel comprises a plurality of communicating transverse flow channels and longitudinal flow channels, so that the heat-conductive working medium flow channel is uniformly arranged in the liquid flow plate.

[0015] Optionally, the battery thermal management system further comprises a heating film, and the heating film is arranged on the side surface of the battery cell.

[0016] Optionally, a plurality of battery cells are arranged in sequence along the length direction of the heating film, the heating film has a plurality of heating areas and non-heating areas arranged in sequence along the length direction of the heating film, the plurality of heating areas are arranged in one-to-one correspondence with the plurality of battery cells, and the non-heating area is located between the adjacent two battery cells.

[0017] Optionally, the heating area is provided with a heating element, and the heating elements in the adjacent two heating areas are connected in series.

[0018] Optionally, the heating element is a resistance wire, and the resistance wire extends in a continuous S-shaped bending manner in the heating film.

[0019] Optionally, the battery thermal management system further comprises a control module and a liquid-heat unit, the battery cell is provided with a first temperature detection element, the liquid flow plate is provided with a second temperature detection element, and the heating film is provided with a third temperature detection element, and the first temperature detection element, the second temperature detection element and the third temperature detection element are signal connected with the control module.

[0020] The heat-conductive working medium flow channel is in communication with the liquid-heat unit, and the liquid-heat unit and the heating film are signal connected with the control module.

[0021] In a second aspect, the application provides a power utilization equipment comprising the battery thermal management system provided in the first aspect of the application.

[0022] Compared with the prior art, the above technical scheme provided by the embodiments of the application has the following advantages:

[0023] The battery thermal management system provided by the embodiment of the present application is provided with a plurality of parallel insulation strips between the liquid flow plate and the battery cell, so that the battery cell and the liquid flow plate have a preset distance. After the glue for preparing the insulation heat-conductive glue layer is coated on the liquid flow plate and the insulation strips, the bottom of the battery cell can be supported by the insulation strips, so that the case that the bottom of the battery cell directly contacts the liquid flow plate and insulation failure and system leakage occur before the glue of the insulation heat-conductive glue layer is solidified is avoided. After the insulation heat-conductive glue layer is solidified, the insulation heat-conductive glue layer with uniform thickness can be formed between the battery cell and the liquid flow plate, so that the gap between the battery cell and the liquid flow plate can be filled by the insulation heat-conductive glue layer to realize uniform heat conduction, and the bottom of the battery cell directly contacts the surface of the liquid flow plate, so that the case that insulation failure and system leakage occur in the assembly process is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without any creative labor.

[0026] One or more embodiments are exemplarily illustrated by the pictures in the drawings corresponding thereto, and these exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified. The drawings in the drawings do not constitute a proportional limitation.

[0027] Figure 1 A partial structure schematic diagram of the battery thermal management system provided by the embodiment of the present application;

[0028] Figure 2 A top view of the battery thermal management system provided by the embodiment of the present application;

[0029] Figure 3 A sectional view of the liquid flow plate provided by the embodiment of the present application;

[0030] Figure 4 A partial side view of the battery thermal management system provided by the embodiment of the present application;

[0031] Figure 5 A detail enlarged view of part A in the above figure; Figure 4

[0032] Figure 6 A connection schematic diagram of the heating film, the battery cell and the control module provided by the embodiment of the present application; ​

[0033] Figure 7 The control principle diagram of the battery thermal management system provided by the embodiment of the present application is shown in the following figure.

[0034] Figure 8 The relationship diagram of the cell temperature and the heating film power and the liquid-heat unit power provided by the embodiment of the present application is shown in the following figure.

[0035] Explanation of reference signs:

[0036] 1, liquid flow plate; 11, heat-conducting working fluid flow channel; 111, transverse flow channel; 112, longitudinal flow channel; 12, liquid inlet; 13, liquid outlet;

[0037] 2, cell;

[0038] 3, insulating heat-conducting adhesive layer;

[0039] 4, insulating strip;

[0040] 5, heating film; 51, heating area; 52, non-heating area; 53, heating element; 54, heating film main body; 55, third temperature detection element;

[0041] 6, control module;

[0042] 7, liquid-heat unit;

[0043] 8, module fixing strip;

[0044] 9, first temperature detection element. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0046] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, reference numerals and / or letters can be repeated in different examples in the present application. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0047] For the convenience of description, spatial relative terms can be used in the specification to describe the relative position relationship or movement of one element or feature with respect to another element or feature as shown in the drawings, such as "inner", "outer", "inboard", "outboard", "under", "below", "on", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or the posture is changed or the movement state is changed, the directional indications will also change accordingly, for example: the element described as "under" or "below" another element or feature will be oriented as "above" or "above" another element or feature. Therefore, the example term "below" can include both the upper and lower positions. The device can be additionally oriented (rotated by 90 degrees or in other directions) and the spatial relative relationship descriptors used in the specification are interpreted accordingly.

[0048] To solve the technical problem of achieving heat conduction between the electric core 2 and the liquid flow plate 1 while avoiding the occurrence of poor insulation and system leakage, the application provides a battery thermal management system. Before the glue of the insulating heat-conducting glue layer 3 is cured, the surface of the electric core 2 and the surface of the liquid flow plate 1 can be isolated by the insulating strip 4, so that there is a preset distance between the electric core 2 and the liquid flow plate 1, avoiding direct contact between the electric core 2 and the liquid flow plate 1, and the occurrence of poor insulation and system leakage. After the formation of the cured insulating heat-conducting glue layer 3, the gap between the electric core 2 and the liquid flow plate 1 can be uniformly filled by the insulating heat-conducting glue layer 3, forming an insulating heat-conducting glue layer 3 with uniform thickness, so as to facilitate uniform heat conduction between the liquid flow plate 1 and the electric core 2, thereby realizing the regulation of the temperature of the electric core 2.

[0049] Please refer to Figures 1 to 8 , the first aspect of the embodiment of the application provides a battery thermal management system, which comprises a liquid flow plate 1, an electric core 2, an insulating heat-conducting glue layer 3 and an insulating strip 4, as Figure 1 shown. The inside of the liquid flow plate 1 is provided with a heat-conducting working medium flow channel 11. Low-temperature heat-conducting working medium or high-temperature heat-conducting working medium can be introduced into the heat-conducting working medium flow channel 11 as needed, and heat conduction between the electric core 2 and the heat-conducting working medium is realized through the liquid flow plate 1, realizing the temperature regulation of the electric core 2.

[0050] A plurality of electric cores 2 are arranged on the liquid flow plate 1, so as to facilitate the transmission of the temperature of the heat-conducting working medium in the liquid flow plate 1 to the electric core 2. Specifically, the liquid flow plate 1 is arranged below the electric core 2, and the bottom of the electric core 2 can be supported by the liquid flow plate 1.

[0051] The insulating and heat-conducting adhesive layer 3 is connected between the battery cell 2 and the flow plate 1, and can realize the fixed connection (i.e. bonding) between the battery cell 2 and the flow plate 1 while realizing temperature conduction.

[0052] The plurality of insulating strips 4 are embedded in the insulating and heat-conducting adhesive layer 3 in parallel, as shown in Figure 1 and Figure 2 , wherein, Figure 2 The dashed structure in the insulating strip 4 is arranged at the bottom of the battery cell 2 and is not visible. The insulating strip 4 is arranged between the battery cell 2 and the flow plate 1, and can support the bottom of the battery cell 2 due to the solid strip structure of the insulating strip 4, so that a preset distance is formed between the battery cell 2 and the flow plate 1. Before the adhesive of the insulating and heat-conducting adhesive layer 3 solidifies, the adhesive is flowable and will be squeezed away under the gravity of the battery cell 2. If the insulating strip 4 is not arranged between the battery cell 2 and the flow plate 1, the surface of the battery cell 2 will be in direct contact with the surface of the flow plate 1, which will cause poor insulation and system leakage.

[0053] It should be noted that, when the battery cell 2 is assembled on the flow plate 1, a plurality of parallel insulating strips 4 are arranged on the flow plate 1, and then the liquid adhesive for preparing the insulating and heat-conducting adhesive layer 3 is coated on the flow plate 1 and the insulating strips 4. Then, the plurality of battery cells 2 are placed on the insulating strips 4, and after the adhesive of the insulating and heat-conducting adhesive layer 3 solidifies, the insulating strips 4 are embedded in the insulating and heat-conducting adhesive layer 3, and the battery cell 2 and the flow plate 1 are bonded through the insulating and heat-conducting adhesive layer 3 with uniform thickness.

[0054] In some embodiments of the present application, the adhesive of the insulating and heat-conducting adhesive layer 3 is made of a mixture of polyurethane material and heat-conducting material (such as aluminum nitride, etc.). Since the thermal conductivity of aluminum nitride is 2.0 W / (m·K) (watts / meter·degree), it has good heat-conducting ability. When the aluminum nitride material is uniformly mixed in the polyurethane adhesive, the solidified insulating and heat-conducting adhesive layer 3 can form a plate-shaped structure with heat-conducting and insulating properties, which can realize uniform heat conduction between the flow plate 1 and the battery cell 2, and can avoid the direct contact between the bottom of the battery cell 2 and the surface of the flow plate 1, which will cause poor insulation and system leakage.

[0055] It should be noted that the thickness of the insulating strip 4 and the insulating and heat-conducting adhesive layer 3 can be set as needed. The thickness shown in the drawings of the present application is for the purpose of showing the connection relationship between the components, and does not constitute a limitation on the size ratio.

[0056] In some embodiments of the present application, please refer to Figure 1 , Figure 2 , Figure 4 and Figure 7, multiple rows of battery cells 2 are arranged in parallel on the liquid flow plate 1, which facilitates regular arrangement of multiple battery cells 2 on the liquid flow plate 1, is conducive to compact battery structure, and is conducive to reducing the overall size of the battery pack. Each row of battery cells 2 forms a battery cell module, and the two ends of the battery cell module are provided with a module fixing strip 8, so that the same row of battery cells 2 can be fixed and arranged. The bottom of any row of battery cells 2 is provided with an insulation strip 4 extending along the arrangement direction thereof, so that the insulation strip 4 can synchronously support the entire row of battery cells 2 (i.e., the battery cell module), so that the same row of battery cells 2 and the liquid flow plate 1 form a uniform gap, and the insulation and heat-conducting adhesive layer 3 with uniform thickness can be formed at the bottom of the battery cell 2.

[0057] It should be noted that at least two parallel insulation strips 4 are arranged at the bottom of the same row of battery cells 2, as shown in Figure 1 and Figure 2 , which can stably support both sides of the bottom of the battery cell 2.

[0058] In some embodiments of the present application, the material of the insulation strip 4 is a heat-conducting material, which can avoid adverse effects of the arrangement of the insulation strip 4 on heat conduction of the liquid flow plate 1 in the region thereof. Specifically, the insulation strip 4 can be made of silica gel or the like, which has the functions of insulation and heat conduction.

[0059] In some embodiments of the present application, please refer to Figure 1 , Figure 2 and Figure 3 , the liquid flow plate 1 includes a liquid inlet 12 and a liquid outlet 13, one end of the heat-conducting working fluid flow channel 11 communicates with the liquid inlet 12, and the other end of the heat-conducting working fluid flow channel 11 communicates with the liquid outlet 13; the heat-conducting working fluid enters the heat-conducting working fluid flow channel 11 through the liquid inlet 12, flows inside the heat-conducting working fluid flow channel 11, and at the same time conducts heat to the insulation and heat-conducting adhesive layer 3 and the battery cell 2 through the liquid flow plate 1, after heat exchange, the heat-conducting working fluid flows out of the liquid flow plate 1 through the liquid outlet 13.

[0060] The heat-conducting working fluid flow channel 11 includes multiple communicating horizontal flow channels 111 and vertical flow channels 112, so that the heat-conducting working fluid flow channel 11 is uniformly arranged in the liquid flow plate 1, so that the surface of the liquid flow plate 1 and the insulation and heat-conducting adhesive layer 3 can be uniformly heated or cooled, so as to facilitate uniform heat conduction to the battery cell 2 arranged above, and avoid the phenomenon that the battery cell 2 in the local region of the liquid flow plate 1 is overheated or overcooled.

[0061] In some embodiments of the present application, the horizontal flow channel 111 extends along the arrangement direction of the same row of battery cells 2 (i.e., the left-right direction in Figure 2 and Figure 3 ), and the vertical flow channel 112 extends along the arrangement direction of the multiple rows of battery cell modules (i.e., the up-down direction in Figure 2 and Figure 3The longitudinal flow channels 112 and the adjacent transverse flow channels 111 are vertically connected, so that the heat-conducting medium flow channel 11 extends in a continuous S shape inside the liquid flow plate 1, as shown in FIG. 2, so as to form a uniform temperature field in the liquid flow plate 1. Figure 3

[0062] As a specific embodiment of the present application, at least two transverse flow channels 111 are arranged below the same row of battery cells 2, so that sufficient and uniform heat conduction can be achieved for the battery cells 2.

[0063] In the above embodiment, since the liquid flow plate 1 conducts heat through the fluid heat-conducting medium, the battery cell 2 is indirectly heated through the liquid flow plate 1 and the insulating heat-conducting adhesive layer 3, and the heating capacity has certain limitations. When the battery is arranged in a power consumption device such as a car that runs across regions, if the car moves to a cold region, the external environment temperature may reach a low temperature of -30 to -40℃, and correspondingly, the battery cell 2 is also prone to have a too low temperature. At this time, heat conduction through the liquid flow plate 1 cannot meet the heating demand of the battery cell 2, and the battery cell 2 is prone to have an overcooling state, which causes the battery system to fail to work normally.

[0064] To solve the above problem, in some embodiments of the present application, please refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7 , the battery thermal management system further comprises a heating film 5 arranged on the side surface of the battery cell 2, which actively heats the side surface of the battery cell 2, so that the temperature of the battery cell 2 is rapidly increased, and the battery can be applied to cold regions.

[0065] When the heating film 5 is arranged in contact with the side surface of the battery cell 2, the heat generated by the heating film 5 can be transmitted to the battery cell 2, so that the surface temperature of the battery cell 2 is rapidly increased, and the surface temperature of the battery cell 2 is rapidly transmitted to the inside of the battery cell 2. In order to uniformly increase the temperature of the battery cell 2, the heating film 5 is preferably arranged on both sides of the battery cell 2, so as to actively and uniformly heat the two sides of the battery cell 2. When the temperature of the battery cell 2 is too low, the heat can be transmitted to the bottom of the battery cell 2 through the liquid flow plate 1, and the side surface of the battery cell 2 is heated through the heating film 5, so as to avoid the overcooling phenomenon of the battery cell 2.

[0066] Specifically, the heating film 5 is a PTC (positive temperature coefficient) heating film. After the heating film 5 is powered and heated, the inner side surface of the heating film main body 54 is tightly attached to the outer surface of the battery cell 2, so as to uniformly transmit the heat on the heating film main body 54 to the battery cell 2. However, when the vertical edges of the outer surface of the battery cell 2 are in a rounded structure, a triangular gap region not attached to the heating film main body 54 is formed between the rounded structures of the adjacent two battery cells 2, and the heating film main body 54 in the triangular gap region cannot be attached to the battery cell, which causes the heating film 5 to dry and waste energy. ​

[0067] To avoid the above problems, in some embodiments of the present application, referring to Figure 4 and Figure 5 , a plurality of electric cores 2 are sequentially arranged along the length direction of the heating film 5, the heating film 5 sequentially has a plurality of heating zones 51 and non-heating zones 52 arranged at intervals along the length direction, the plurality of heating zones 51 and the plurality of electric cores 2 are one-to-one correspondingly arranged, which can be used for adhesion heating with the side surface of the electric core 2, and the non-heating zone 52 is located between the adjacent two electric cores 2, which can be used for being arranged opposite to the gap between the two electric cores 2, avoiding the situation that the gap region formed between the two electric cores 2 exists dry burning and energy waste of the heating film 5.

[0068] In some embodiments of the present application, referring to Figure 5 , the heating zone 51 is provided with a heating element 53, and the heating elements 53 in the adjacent two heating zones 51 are connected in series, which can simplify the connection structure between the plurality of heating elements 53 in the heating film 5, and avoid the layout confusion of the wires in the heating film main body 54.

[0069] It should be noted that the heating element 53 in the heating zone 51 can be a heating sheet matched with the area of the heating zone 51, or can be a resistance wire uniformly arranged in the heating zone 51, both of which can achieve the purpose of the present application.

[0070] In some embodiments of the present application, referring to Figure 4 and Figure 5 , the heating element 53 is a resistance wire, the resistance wire extends in a continuous S-shaped bending manner in the heating film 5, which can form a heating zone 51 with dense resistance wires on the side surface of the electric core, and the resistance wire can realize direct heating of the electric core 2 by heating after being electrified, which can quickly raise the temperature of the electric core 2.

[0071] Specifically, the resistance wires in the adjacent plurality of heating zones 51 are of an integrated structure, that is, the plurality of heating elements 53 in the plurality of heating zones 51 are formed by bending and extending the same resistance wire, which is convenient for arranging the heating element 53 on the heating film main body 54 and reduces the use of series connection wires between the heating elements 53, as shown in Figure 4 and Figure 5 .

[0072] In some embodiments of the present application, referring to Figure 6 and Figure 7Wherein the dot-dash line represents electrical or signal connection, the battery thermal management system further comprises a control module 6 and a liquid-heat unit 7, the battery cell 2 is provided with a first temperature detection member 9 for detecting the temperature of the battery cell 2, the liquid flow plate 1 is provided with a second temperature detection member for detecting the temperature of the heat-conducting working medium in the liquid flow plate 1, and the heating film 5 is provided with a third temperature detection member 55 for detecting the temperature of the heating film 5; the first, second and third temperature detection members 9, 55 are in signal connection with the control module 6 to transmit temperature detection signals to the control module 6. The heat-conducting working medium flow channel 11 is in communication with the liquid-heat unit 7, and the liquid-heat unit 7 and the heating film 5 are in signal connection with the control module 6, so that the control module 6 can control the heating temperature of the liquid-heat unit 7 and the heating film 5, thereby avoiding the phenomenon of overcooling or overheating of the battery cell 2.

[0073] Specifically, the control module 6 is a BMS (Battery Management System), the first temperature detection member 9 is arranged on the tab of the battery cell 2, the second temperature detection member is arranged at the liquid inlet 12 of the liquid flow plate 1, and the third temperature detection member 55 is arranged on the heating film body 54; the BMS is internally provided with a corresponding table of the temperature of the battery cell 2 and the power of the PTC heating film and the heating power of the liquid-heat unit 7, the BMS determines the heating power of the heating film 5 and the heating power of the liquid-heat unit 7 according to the temperature of the battery cell 2, controls the surface temperature of the heating film 5 and the fluid temperature inside the heat-conducting working medium flow channel 11, thereby achieving the purpose of controlling the heating speed of the battery cell 2, avoiding the phenomenon of excessive temperature rise of the battery cell 2 due to excessive heating current of the PTC heating film, or avoiding the phenomenon of slow heating speed of the system due to small heating current of the PTC heating film in a low-temperature state.

[0074] The second aspect of the embodiment of the application provides a power-using device comprising the battery thermal management system described above. The power-using device can be any device requiring a power battery pack, such as a car, so as to facilitate adaptive thermal management of the battery according to the ambient temperature when the power-using device moves in different areas, thereby ensuring the normal operation of the power-using device.

[0075] Please refer to Figures 1 to 8 In some embodiments of the application, the working method of the battery thermal management system described above is as follows:

[0076] Step one: detecting the temperature of the battery cell 2 by the first temperature detection member 9, detecting the temperature of the liquid inlet 12 of the liquid flow plate 1 by the second temperature detection member, detecting the temperature of the heating film body 54 by the third temperature detection member 55, and sending the detected temperature information to the control module 6.

[0077] Step two: when the temperature of the battery cell 2 is below zero and there is a risk of overcooling, the power of the heating film 5 is adjusted to the maximum to rapidly increase the temperature of the battery cell 2, at this time, the liquid flow plate 1 and the liquid-heat unit 7 only have auxiliary heating effect, and their power can be the minimum, as shown in Figure 8 .

[0078] Step 3: The temperature of the battery cell 2 gradually rises. To avoid uneven temperature inside the battery cell 2 caused by rapid heating, the power of the heating film 5 needs to be gradually reduced. At the same time, in order to meet the heating requirements of the battery cell 2, the power of the liquid heating unit 7 is gradually increased.

[0079] Step 4: When the temperature of the battery cell 2 approaches the normal temperature (i.e., the heating stop temperature), the power of the heating film 5 is adjusted to the lowest, and the normal heating of the battery cell 2 is maintained through the liquid heat unit 7, so that the temperature of the battery cell 2 is maintained in the normal temperature range.

[0080] Step 5: When the battery cell 2 has been running for a period of time and there is a risk of overheating, turn off the heating function of the heating film 5 and the liquid thermal module, and input a low-temperature heat-conducting medium into the liquid flow plate 1 through the liquid thermal module to achieve uniform cooling of the battery cell 2 and restore the temperature of the battery cell 2 to the normal temperature range.

[0081] It should be noted that the present application can achieve combined heating of the battery cell 2 by cooperating with the heating film 5, the liquid flow plate 1 and the liquid heat unit 7. The heating power of the liquid heat unit 7 has an opposite trend to that of the heating film 5. Figure 8 As shown, in the early stage, the heating power of the heating film 5 is relatively high, while the heating power of the liquid thermal unit 7 is relatively low. The main purpose of the heating of the liquid thermal unit 7 at this stage is to maintain an ideal thermal equilibrium between the fluid temperature of the liquid flow plate 1 and the bottom surface temperature of the battery cell 2. When the temperature of the battery cell 2 reaches a certain value, the heating power of the liquid thermal unit 7 is increased and the heating power of the heating film 5 is reduced, gradually transitioning to heating by the liquid thermal unit 7 and heat transfer by the liquid flow plate 1, avoiding the problem of thermal runaway caused by the excessive heating speed of the heating film 5.

[0082] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0083] Although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example implementations.

[0084] The foregoing is considered as illustrative of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Accordingly, the scope of the application is to be interpreted only as is fairly required in view of the patent principles and novel features shown herein.

Claims

1. A battery thermal management system, characterized in that: include: A liquid flow plate (1), wherein a heat-conducting medium flow channel (11) is provided inside the liquid flow plate (1); Battery cells (2), a plurality of the battery cells (2) are arranged on the liquid flow plate (1); an insulating thermally conductive adhesive layer (3), the insulating thermally conductive adhesive layer (3) being connected between the battery core (2) and the liquid flow plate (1); Insulating strips (4), a plurality of insulating strips (4) are embedded in the insulating thermally conductive adhesive layer (3) in parallel, and the insulating strips (4) are arranged between the battery core (2) and the liquid flow plate (1), so that a preset distance exists between the battery core (2) and the liquid flow plate (1).

2. The battery thermal management system according to claim 1, characterized in that: Multiple rows of battery cells (2) are arranged in parallel on the liquid flow plate (1), and the bottom of any row of battery cells (2) is provided with an insulating strip (4) extending along the arrangement direction thereof.

3. The battery thermal management system according to claim 1, characterized in that: The insulating strip (4) is made of a heat-conducting material.

4. The battery thermal management system according to claim 1, characterized in that: The liquid flow plate (1) comprises a liquid inlet (12) and a liquid outlet (13); one end of the heat-conducting medium flow channel (11) is in communication with the liquid inlet (12); and the other end of the heat-conducting medium flow channel (11) is in communication with the liquid outlet (13); The heat-conducting medium flow channel (11) comprises a plurality of interconnected transverse flow channels (111) and longitudinal flow channels (112), so that the heat-conducting medium flow channel (11) is evenly distributed in the liquid flow plate (1).

5. The battery thermal management system according to any one of claims 1 to 4, characterized in that: It also includes a heating film (5), which is arranged on the side of the battery core (2).

6. The battery thermal management system according to claim 5, characterized in that: A plurality of the battery cells (2) are sequentially arranged along the length direction of the heating film (5); the heating film (5) has a plurality of heating zones (51) and non-heating zones (52) arranged at intervals along the length direction thereof; the plurality of heating zones (51) and the plurality of battery cells (2) are arranged in a one-to-one correspondence; and the non-heating zone (52) is located between two adjacent battery cells (2).

7. The battery thermal management system according to claim 6, characterized in that: A heating element (53) is provided in the heating zone (51), and the heating elements (53) in two adjacent heating zones (51) are connected in series.

8. The battery thermal management system according to claim 7, wherein the heating element (53) is a resistance wire, and the resistance wire is bent and extended in a continuous S-shape in the heating film (5).

9. The battery thermal management system according to claim 5, characterized in that: It also includes a control module (6) and a liquid heat unit (7), wherein the battery core (2) is provided with a first temperature detection element (9), the liquid flow plate (1) is provided with a second temperature detection element, and the heating film (5) is provided with a third temperature detection element (55), and the first temperature detection element (9), the second temperature detection element, and the third temperature detection element (55) are all connected to the control module (6) for signal transmission; The heat-conducting medium flow channel (11) is in communication with the liquid-heating unit (7), and both the liquid-heating unit (7) and the heating film (5) are signal-connected to the control module (6).

10. An electrical device, characterized in that: The battery thermal management system comprises the battery thermal management system according to any one of claims 1 to 9.

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