Battery pack and electric device

Abstract

The utility model provides a kind of battery pack and electrical equipment, comprising: at least one battery component;Liquid cooling plate is set to the side of battery component along first direction;Heat exchange member, and at least part of battery component constitutes contact;Wherein, liquid cooling plate has liquid inlet, liquid outlet and heat exchange runner, and heat exchange runner is communicated between liquid inlet and liquid outlet;In second direction, heat exchange member is spaced apart from liquid inlet;Second direction and first direction intersect.This application is based on the heat exchange of liquid cooling plate and battery component, and heat exchange member is spaced apart from liquid inlet, and the heat exchange member can be heat exchanged with battery component, to adjust the temperature of at least part of battery component contacted with heat exchange member, to reduce the temperature difference of different positions of battery component.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack and electrical equipment. Background Technology

[0002] Currently, in order to effectively solve the thermal management problem of battery packs, liquid cooling plates adapted to the battery components are usually used to adjust the temperature of the battery components.

[0003] In related technologies, liquid cooling plates have heat exchange channels that guide the heat exchange medium along a predetermined path. However, during the heat exchange process with the battery module, there is a temperature difference between the upstream and downstream of the heat exchange channel, which can easily lead to temperature differences at different locations of the battery module. Utility Model Content

[0004] The present invention provides a battery pack and electrical device to at least partially solve the above-mentioned technical problems.

[0005] In a first aspect, embodiments of the present invention provide a battery pack, comprising:

[0006] At least one battery component;

[0007] A liquid cooling plate is disposed on one side of the battery assembly along a first direction;

[0008] The heat exchanger is in contact with at least a portion of the battery assembly;

[0009] The liquid cooling plate has a liquid inlet, a liquid outlet, and a heat exchange channel, wherein the heat exchange channel is connected between the liquid inlet and the liquid outlet.

[0010] In the second direction, the heat exchanger is spaced apart from the liquid inlet; the second direction intersects with the first direction.

[0011] Using the above scheme, based on the heat exchange between the liquid cooling plate and the battery module, a heat exchange component is set at a distance from the liquid inlet. This heat exchange component can exchange heat with the battery module to adjust the temperature of at least a part of the battery module in contact with the heat exchange component, thereby reducing the temperature difference at different locations of the battery module.

[0012] Optionally, in some embodiments of this application, the heat exchanger includes:

[0013] At least two first heat exchange sections are configured to exchange heat with the battery assembly;

[0014] Wherein, at least two first heat exchange sections are arranged at intervals along a third direction, and there is an accommodating space between two adjacent first heat exchange sections, and at least a portion of the battery assembly is disposed in the accommodating space;

[0015] The third direction intersects with the first direction and the second direction, respectively.

[0016] By adopting the above solution, by setting a first heat exchange section and placing at least a portion of the battery assembly in the accommodating space formed by the first heat exchange section, the contact area between the heat exchange component and the battery assembly can be increased, and the mutual positioning of the first heat exchange section and the battery assembly is also beneficial.

[0017] Optionally, in some embodiments of this application, the ratio of the size of the first heat exchange portion to the size of the battery assembly in the first direction ranges from 0.2 to 0.6.

[0018] By adopting the above solution, by limiting the ratio of the dimensions of the first heat exchange part and the battery assembly in the first direction, the heat exchange part and the battery assembly can maintain a suitable heat exchange rate, and interference between the first heat exchange part and other structures of the battery assembly can be avoided.

[0019] Optionally, in some embodiments of this application, in the second direction, the ratio of the size of the first heat exchange portion to the size of the battery assembly ranges from 0.2 to 0.6.

[0020] By adopting the above scheme, and by limiting the ratio of the dimensions of the first heat exchange section and the battery assembly in the second direction, it is possible to ensure the adjustment range of the heat exchange component for the battery assembly while also taking into account the temperature adjustment effect.

[0021] Optionally, in some embodiments of this application, the battery pack further includes:

[0022] The first type of thermally conductive adhesive is at least partially disposed between the first heat exchange section and the battery assembly.

[0023] By adopting the above solution and using the first type of thermally conductive adhesive, the contact area between the first heat exchange section and the battery module can be increased, thereby improving the heat exchange efficiency. At the same time, the first type of thermally conductive adhesive can also play a role in insulation and shock absorption.

[0024] Optionally, in some embodiments of this application, the first heat exchange section includes two heat exchange surfaces disposed opposite each other in the third direction;

[0025] The first type of thermally conductive adhesive includes:

[0026] The first part is located on one of the heat exchange surfaces;

[0027] The second part is another heat exchange surface located in the same first heat exchange section;

[0028] A transition section connects the first part and the second part;

[0029] The transition section is disposed around the transition region between the two heat exchange surfaces.

[0030] By adopting the above scheme, the first part and the second part are respectively positioned to correspond to the two heat exchange surfaces of the first heat exchange section. That is, the same type I thermally conductive adhesive is used on both sides of the first heat exchange section, which improves assembly efficiency. At the same time, the transition part is set to form a smooth transition between the first part and the second part, connecting the first part and the second part into a whole. Under this setting, the type I thermally conductive adhesive has a large contact area with the first heat exchange section, which can improve the stability of the type I thermally conductive adhesive installed on the first heat exchange section.

[0031] Optionally, in some embodiments of this application, in the direction in which the inlet and the outlet are spaced apart, the thermal conductivity of the first type of thermally conductive adhesive near the outlet is greater than or equal to the thermal conductivity of the first type of thermally conductive adhesive near the inlet.

[0032] By adopting the above solution, when the thermal conductivity of each type of thermally conductive adhesive corresponding to the same heat exchanger is equal, the differences between the types of thermally conductive adhesives can be avoided, and the processing and manufacturing of the type of thermally conductive adhesive can be facilitated.

[0033] When the thermal conductivity of the first type of thermally conductive adhesive near the liquid outlet is greater than that near the liquid inlet, the thermal conductivity between the first type of thermally conductive adhesive near the liquid outlet and the battery module is greater than that between the first type of thermally conductive adhesive near the liquid inlet and the battery module. Thus, the thermal conductivity of the first type of thermally conductive adhesive is matched with the position of its corresponding heat exchange channel, further balancing the temperature difference between different battery modules in the direction of the liquid inlet and liquid outlet spacing.

[0034] Optionally, in some embodiments of this application, the heat exchanger further includes:

[0035] The second heat exchange section is connected to one end of the first heat exchange section so that the first heat exchange section and the second heat exchange section can exchange heat.

[0036] The second heat exchange section is also configured to exchange heat with the outside.

[0037] By adopting the above scheme, the heat of the battery module is transferred to the outside through the cooperation of the second heat exchange section and the first heat exchange section, so as to achieve rapid adjustment of the temperature of the battery module.

[0038] Optionally, in some embodiments of this application, the second heat exchange section is located on the side of the battery assembly away from the liquid inlet;

[0039] And / or, the second heat exchange section is located on the side of the battery assembly away from the liquid outlet.

[0040] By adopting the above solution, by limiting the location of the second heat exchange section to the side of the battery pack away from the liquid inlet, it is possible to avoid the second heat exchange section affecting the arrangement of the liquid inlet and the cell connection components in the battery pack.

[0041] By positioning the second heat exchange section on the side of the battery pack away from the liquid outlet, it is possible to prevent the second heat exchange section from affecting the arrangement of the liquid outlet and the cell connection components in the battery pack.

[0042] Optionally, in some embodiments of this application, the battery pack further includes:

[0043] The cover shall at least cover the battery assembly and the heat exchanger;

[0044] At least a portion of the second heat exchange section is in contact with the box cover.

[0045] By adopting the above solution, the heat of the battery module is conducted to the cover by at least part of the second heat exchange part contacting the cover, and the cover dissipates heat to the external environment, which is conducive to continuous heat exchange between the heat exchange component and the battery module.

[0046] Optionally, in some embodiments of this application, at least two of the first heat exchange units are connected to the same second heat exchange unit.

[0047] By adopting the above scheme, at least two first heat exchange units are connected through the same second heat exchange unit, which facilitates the assembly of heat exchange components and battery modules.

[0048] Optionally, in some embodiments of this application, the thickness of the second heat exchange portion in the second direction is greater than or equal to the thickness of the first heat exchange portion in the third direction.

[0049] By adopting the above solution, by limiting the thickness of the first heat exchange section, the installation space required for the first heat exchange section can be reduced, the impact on the installation spacing between adjacent battery modules can be reduced, and the heat of the battery modules can be quickly transferred from the first heat exchange section to the second heat exchange section. By limiting the thickness of the second heat exchange section, the second heat exchange section can store more heat and provide more stable heat conduction capability.

[0050] Optionally, in some embodiments of this application, the heat exchanger includes a heat pipe.

[0051] By adopting the above scheme, the heat exchange components are made of heat pipes, resulting in high heat transfer efficiency and high reliability without the need for external power drive.

[0052] Optionally, in some embodiments of this application, the battery pack includes:

[0053] At least two Class II thermally conductive adhesives are respectively disposed between the battery assembly and the liquid cooling plate;

[0054] In the heat exchange channel, at least two second-type thermally conductive adhesives are arranged sequentially along the extension path, and the thermal conductivity of the second-type thermally conductive adhesive near the liquid outlet is greater than that of the second-type thermally conductive adhesive near the liquid inlet.

[0055] By adopting the above solution, by limiting the thermal conductivity of the second type of thermally conductive adhesive near the liquid outlet to be greater than that near the liquid inlet, the thermal conductivity of the second type of thermally conductive adhesive is matched with the position of its corresponding heat exchange channel. This can compensate for the loss of heat exchange efficiency caused by the temperature change of the heat exchange medium, thereby balancing the heat exchange efficiency at different positions of the heat exchange channel, improving the temperature uniformity of different areas in the battery pack, and improving the overall performance and service life of the battery pack.

[0056] Optionally, in some embodiments of this application, the thermal conductivity of at least two of the second type of thermally conductive adhesives increases by a preset coefficient difference along the extension path of the heat exchange channel.

[0057] By adopting the above scheme, the thermal conductivity of the second type of thermally conductive adhesive is limited to increase by a preset coefficient difference, so that the thermal conductivity of the second type of thermally conductive adhesive is adapted to the temperature change of the heat exchange medium in the heat exchange channel, further balancing the heat exchange efficiency at different positions in the heat exchange channel and improving the temperature uniformity of different areas in the battery pack.

[0058] Secondly, embodiments of this utility model provide an electrical device, including the battery pack described above. Attached Figure Description

[0059] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 This is a perspective view of a portion of the battery pack provided in an embodiment of this utility model;

[0061] Figure 2 This is a perspective view of a portion of the battery pack provided in an embodiment of the present invention.

[0062] Figure 3 This is a schematic diagram of the heat exchange channel of the liquid cooling plate in the battery pack provided in an embodiment of the present invention;

[0063] Figure 4 This is an exploded view of a portion of the battery pack provided in an embodiment of this utility model;

[0064] Figure 5 yes Figure 4 Enlarged view of section A;

[0065] Figure 6 This is a three-dimensional schematic diagram of the heat exchange component and the first type of thermally conductive adhesive in the battery pack provided by an embodiment of this utility model;

[0066] Figure 7 yes Figure 6 Enlarged view of section B;

[0067] Figure 8 yes Figure 6 Enlarged view of section C;

[0068] Figure 9 This is a top view of the heat exchange component in the battery pack provided in an embodiment of the present invention;

[0069] Figure 10 This is a side view of a portion of the battery pack provided in an embodiment of the present invention;

[0070] Figure 11 This is a perspective view of the battery pack provided in an embodiment of the present invention;

[0071] Figure 12 This is an exploded view of the battery pack provided in an embodiment of this utility model;

[0072] Figure 13 This is a cross-sectional view of the battery pack provided in an embodiment of this utility model;

[0073] Figure 14 This is a schematic diagram of the structure of the second type of thermally conductive adhesive in the battery pack provided by an embodiment of this utility model.

[0074] Explanation of reference numerals in the attached figures:

[0075] 100. Battery pack;

[0076] 110. Battery assembly; 111. Individual battery cell; 112. Frame; 112a. Binding strap; 112b. Limiting component;

[0077] 120. Liquid cooling plate; 121. Liquid inlet; 122. Liquid outlet; 123. Heat exchange channel; 123a. Channel section;

[0078] 130. Heat exchanger; 131. First heat exchange section; 131a. Heat exchange surface; 132. Second heat exchange section; 130a. Accommodation space;

[0079] 140. Type I thermally conductive adhesive; 141. First part; 142. Second part; 143. Transition section;

[0080] 150. Box lid;

[0081] 160. Type II thermally conductive adhesive;

[0082] 170. Cell connection assembly. Detailed Implementation

[0083] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model.

[0084] In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operating state, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". The terms first, second, third, etc., are used merely as illustrative purposes and do not impose numerical requirements or establish a numerical order.

[0085] In this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.

[0086] Firstly, referring to Figures 1 to 3 This application provides a battery pack 100, including: a battery assembly 110, a liquid cooling plate 120, and a heat exchanger 130.

[0087] The battery assembly 110 is provided with at least one; a liquid cooling plate 120 is disposed on one side of the battery assembly 110 along a first direction; a heat exchanger 130 is in contact with at least a portion of the battery assembly 110 so that the heat exchanger 130 can exchange heat with the battery assembly 110.

[0088] The liquid cooling plate 120 has a liquid inlet 121, a liquid outlet 122 and a heat exchange channel 123, which connects the liquid inlet 121 and the liquid outlet 122. In the second direction, the heat exchange element 130 is spaced apart from the liquid inlet 121. The second direction intersects the first direction, or more specifically, the second direction intersects the first direction at an angle or is perpendicular to each other.

[0089] It is understood that on the projection plane perpendicular to the first direction, the projection of the heat exchange channel 123 at least partially coincides with the projection of the battery assembly 110; and on the extension path of the heat exchange channel 123 from the liquid inlet 121 to the liquid outlet 122, the heat exchange channel 123 can pass through different positions of the battery assembly 110 and different battery assemblies 110; the heat exchange medium flows from the liquid inlet 121 to the liquid outlet 122 under the guidance of the heat exchange channel 123 and exchanges heat with the battery assembly 110. As the temperature of the heat exchange medium rises, it may cause the heat of the heat exchange medium to be transferred to the battery assembly 110 in the reverse direction or the heat exchange rate to decrease, resulting in temperature differences between different positions of the battery assembly 110 or between different battery assemblies 110.

[0090] Based on the above, this embodiment of the application provides a heat exchanger 130 spaced apart from the liquid inlet 121. The heat exchanger 130 exchanges heat with the battery assembly 110 it contacts, which can remove the heat transferred in the reverse direction from the heat exchange medium to the battery assembly 110, or provide additional heat dissipation measures to compensate for the reduced heat exchange rate of the heat exchange channel 123. In the second direction, the number of heat exchangers 130 can be one or at least two, and the number of heat exchangers 130 can be selected according to the design of the battery pack 100.

[0091] Using the above scheme, on the basis of heat exchange between the liquid cooling plate 120 and the battery assembly 110, a heat exchange element 130 is provided at a distance from the liquid inlet 121. The heat exchange element 130 can exchange heat with the battery assembly 110 to adjust the temperature of at least a part of the battery assembly 110 in contact with the heat exchange element 130, thereby reducing the temperature difference at different locations of the battery assembly 110.

[0092] It should be noted that the first direction, indicating the up and down direction, is used here only for the convenience of introducing specific embodiments of this application. There is no absolute correspondence between the first direction and the up and down direction. Similarly, there is no absolute correspondence between the second direction and the front and back direction, and between the third direction and the left and right direction. Furthermore, the first direction, second direction, and third direction of this application are only used to express relative positional relationships; they only indicate approximate locations, not absolute geometric relationships.

[0093] In one example of this application, reference is made to Figure 1The liquid cooling plate 120 is located at the bottom of the battery assembly 110 (that is, the liquid cooling plate 120 is located below the battery assembly 110), and the heat exchanger 130 is spaced apart from the liquid inlet 121 in the front-back direction.

[0094] In some specific embodiments, the battery assembly 110 may be a conventionally bonded battery module, for example, referring to... Figure 5 Multiple individual cells 111 can be bound together into a battery module using a frame 112 (e.g., straps 112a and retaining members 112b), and one or more battery modules can be combined to form a battery pack 100; alternatively, the battery assembly 110 can also eliminate the frame 112, and the individual cells 111 can be directly grouped by bonding or stacking, and multiple individual cells 111 arranged in the second direction can be regarded as a battery assembly 110.

[0095] In some specific implementations, refer to Figure 3 The heat exchange channel 123 includes at least two channel segments 123a, which are arranged in the left-right direction. Each channel segment 123a corresponds to at least one battery module 110. More specifically, the heat exchange channel 123 is S-shaped. Of course, different shapes of the heat exchange channel 123 can be selected according to the arrangement of the battery module 110 or the heat exchange requirements.

[0096] In some embodiments of this application, reference is made to Figure 2 and Figure 3 The heat exchanger 130 is disposed at the junction of adjacent flow channel sections 123a and contacts at least one battery assembly 110. More specifically, in the second direction, only one heat exchanger 130 may be provided.

[0097] In some other embodiments of this application, at least two heat exchangers 130 may be provided in the second direction. The heat exchange rates of each heat exchanger 130 may be consistent, or the heat exchange rates may be adjusted accordingly based on their distance from the liquid inlet 121 to further reduce the temperature difference. It should be understood that the number and heat exchange rate of the heat exchangers 130 can be selected according to the temperature adjustment requirements.

[0098] In some embodiments of this application, reference is made to Figure 6 The heat exchanger 130 includes: a first heat exchange section 131.

[0099] See again Figure 4 and Figure 6 At least two first heat exchange sections 131 are provided, and the first heat exchange sections 131 are configured to exchange heat with the battery assembly 110; the at least two first heat exchange sections 131 are spaced apart along a third direction, and there is an accommodating space 130a between adjacent first heat exchange sections 131, as shown in the reference. Figure 5At least a portion of the battery assembly 110 is disposed in the accommodating space 130a; the third direction intersects the first direction and the second direction respectively, and more specifically, the third direction intersects the first direction and the second direction at an angle or is perpendicular to each other.

[0100] It is understood that one or at least two battery modules 110 may be disposed in the accommodating space 130a between two adjacent first heat exchange sections 131. The first heat exchange section 131 may be in contact with at least one battery cell in the battery module 110.

[0101] By adopting the above solution, by setting the first heat exchange part 131 and placing at least a portion of the battery assembly 110 in the accommodating space 130a formed by the first heat exchange part 131, the contact area between the heat exchange part 130 and the battery assembly 110 can be increased, and the mutual positioning of the first heat exchange part 131 and the battery assembly 110 is also beneficial.

[0102] In one example of this application, reference is made to Figure 4 and Figure 5 At least two sets of battery components 110 are arranged in the left-right direction; in the same heat exchanger 130, two first heat exchange parts 131 located at the edge are arranged on the outer side of the entire at least two battery components 110, while at least one first heat exchange part 131 located in the middle is inserted between the two battery components 110.

[0103] In some embodiments of this application, reference is made to Figure 13 In the first direction, the ratio of the size H1 of the first heat exchange section 131 to the size H2 of the battery assembly 110 ranges from 0.2 to 0.6.

[0104] It is understandable that the ratio of the dimensions of the first heat exchange part 131 and the battery assembly 110 in the first direction affects the contact area of ​​the first heat exchange part 131 and the battery assembly 110 in the first direction. If the ratio of the dimensions of the first heat exchange part 131 and the battery assembly 110 in the first direction is too small, the heat exchange rate between the first heat exchange part 131 and the battery assembly 110 is limited and cannot meet the temperature adjustment requirements of the battery assembly 110. If the ratio of the dimensions of the first heat exchange part 131 and the battery assembly 110 in the first direction is too large, it will cause the part of the battery assembly 110 in contact with the first heat exchange part 131 to dissipate heat excessively, resulting in the temperature of this part being significantly lower than the temperature of other parts of the battery assembly 110. Furthermore, if the size of the first heat exchange part 131 is too large, it is also easy to interfere with other structures of the battery assembly 110, such as the strap 112a.

[0105] In the first direction, the ratio of the size H1 of the first heat exchange section 131 to the size H2 of the battery assembly 110 can be at least one of 0.2 to 0.25, 0.25 to 0.3, 0.3 to 0.35, 0.35 to 0.4, 0.4 to 0.45, 0.45 to 0.5, 0.5 to 0.55, and 0.55 to 0.6.

[0106] By adopting the above solution, by limiting the ratio of the dimensions of the first heat exchange part 131 and the battery assembly 110 in the first direction, the heat exchange part 130 and the battery assembly 110 can maintain a suitable heat exchange rate, and other structural interference between the first heat exchange part 131 and the battery assembly 110 can be avoided.

[0107] In one example of this application, in the first direction (up and down direction), the ratio of the size H1 of the first heat exchange part 131 to the size H2 of the battery assembly 110 ranges from 0.3 to 0.45, further optimizing the heat exchange efficiency between the heat exchange part 130 and the battery assembly 110.

[0108] In some embodiments of this application, reference is made to Figure 9 and Figure 10 In the second direction, the ratio of the size L1 of the first heat exchange section 131 to the size L2 of the battery assembly 110 ranges from 0.2 to 0.6.

[0109] It is understandable that the size of the first heat exchange section 131 in the second direction affects the contact range between the heat exchange element 130 and the battery assembly 110, that is, the number of battery cells 111 that the heat exchange element 130 can contact. When the ratio of the size of the first heat exchange section 131 to the size of the battery assembly 110 in the second direction is too small, the contact range between the first heat exchange section 131 and the battery assembly 110 is limited, and the temperature adjustment range of the battery assembly 110 is small. When the ratio of the size of the first heat exchange section 131 to the size of the battery assembly 110 in the second direction is too large, the first heat exchange section 131 contacts more battery cells 111, and the temperature adjustment of the first heat exchange section 131 for each battery cell 111 is limited, resulting in a poor adjustment effect.

[0110] In this embodiment, in the second direction, the ratio of the size L1 of the first heat exchange section 131 to the size L2 of the battery assembly 110 can be at least one of 0.2 to 0.25, 0.25 to 0.3, 0.3 to 0.35, 0.35 to 0.4, 0.4 to 0.45, 0.45 to 0.5, 0.5 to 0.55, and 0.55 to 0.6.

[0111] By adopting the above solution, by limiting the ratio of the dimensions of the first heat exchange section 131 and the battery assembly 110 in the second direction, it is possible to ensure the adjustment range of the heat exchange section 130 on the battery assembly 110 while also taking into account the temperature adjustment effect.

[0112] In one example of this application, in the second direction (front-back direction), the ratio of the size L1 of the first heat exchange part 131 to the size L2 of the battery assembly 110 ranges from 1 / 3 to 1 / 2, which can further optimize the adjustment range and adjustment effect of the heat exchange part 130.

[0113] In some specific implementation methods, refer to Figure 4 and Figure 5 The battery assembly 110 also includes individual battery cells 111 and limiting members 112b. In the first direction, multiple individual battery cells 111 are located between two limiting members 112b. Therefore, the size of the battery assembly 110 in the first direction can be the overall size of the multiple individual battery cells 111 and the two limiting members 112b.

[0114] In some embodiments of this application, reference is made to Figures 5 to 7 The battery pack 100 also includes a first type of thermally conductive adhesive 140. At least a portion of the first type of thermally conductive adhesive 140 is disposed between the first heat exchange section 131 and the battery assembly 110.

[0115] It is understandable that the first type of thermally conductive adhesive 140, as the heat transfer medium between the first heat exchange section 131 and the battery assembly 110, can effectively compensate for the uneven contact caused by the uneven surface of the battery assembly 110.

[0116] By adopting the above solution and using the first type of thermally conductive adhesive 140, the contact area between the first heat exchange section 131 and the battery assembly 110 can be increased, thereby enhancing the heat exchange efficiency. At the same time, the first type of thermally conductive adhesive 140 can also play a role in insulation and shock absorption.

[0117] In some specific embodiments, the first type of thermally conductive adhesive 140 can be pre-formed and then installed onto the first heat exchange part 131 or the battery assembly 110. The first type of thermally conductive adhesive 140 can also be formed by potting. The formation and assembly method of the first type of thermally conductive adhesive 140 can be selected according to design requirements.

[0118] In some embodiments of this application, reference is made to Figures 6 to 8 The first heat exchange section 131 includes two heat exchange surfaces 131a arranged opposite each other in the third direction.

[0119] The first type of thermally conductive adhesive 140 includes: a first part 141, a second part 142, and a transition part 143.

[0120] The first part 141 is located on one of the heat exchange surfaces 131a; the second part 142 is located on the other heat exchange surface 131a of the same first heat exchange part 131; the transition part 143 is connected between the first part 141 and the second part 142; the transition part 143 is arranged around the transition area between the two heat exchange surfaces 131a.

[0121] By adopting the above scheme, the first part 141 and the second part 142 are respectively positioned to correspond to the two heat exchange surfaces 131a of the first heat exchange part 131. That is, the same first type of thermally conductive adhesive 140 is used on both sides of the first heat exchange part 131, which improves assembly efficiency. At the same time, the transition part 143 forms a smooth transition between the first part 141 and the second part 142, connecting the first part 141 and the second part 142 into a whole. Under this configuration, the first type of thermally conductive adhesive 140 has a large contact area with the first heat exchange part 131, which can improve the stability of the first type of thermally conductive adhesive 140 installed on the first heat exchange part 131.

[0122] In one example of this application, reference is made to Figure 7 In the same heat exchanger 130, the first portion 141 and the second portion 142 of the heat exchanger 130 in contact with the first heat exchanger 131 located in the middle have equal lengths. However, for the first heat exchanger 131 located at the edge, referring to... Figure 8 The portion of the first type of thermally conductive adhesive 140 that is in contact with the heat exchange surface 131a of the battery assembly 110 is defined as the first portion 141, and the portion of the first type of thermally conductive adhesive 140 that is in contact with the heat exchange surface 131a away from the battery assembly 110 is defined as the second portion 142. Since the heat exchange surface 131a away from the battery assembly 110 does not contact the battery assembly 110, the length of the second portion 142 in the first heat exchange portion 131 located at the edge is less than the length of the first portion 141, which can reduce the amount of the first type of thermally conductive adhesive 140 used.

[0123] In some embodiments of this application, the thickness of the first type of thermally conductive adhesive 140 ranges from 0.8 mm to 1.2 mm.

[0124] In some embodiments of this application, reference is made to Figure 1 , Figure 3 and Figure 6 The inlet 121 and outlet 122 are spaced apart along a third direction upward, and the thermal conductivity of each type of thermally conductive adhesive 140 corresponding to the same heat exchanger 130 is equal. In this way, the differences between the types of thermally conductive adhesives 140 can be reduced, which facilitates the processing and manufacturing of the type of thermally conductive adhesives 140.

[0125] In some other embodiments of this application, in the direction in which the inlet 121 and the outlet 122 are spaced apart, the thermal conductivity of the first type of thermally conductive adhesive 140 near the outlet 122 is greater than that of the first type of thermally conductive adhesive 140 near the inlet 121.

[0126] It is understandable that during the heat exchange process between the heat exchange medium in the heat exchange channel 123 and the battery module 110, the temperature of the heat exchange medium changes, and the temperature of the heat exchange medium is higher closer to the liquid outlet 122, which can easily cause a temperature difference between different battery modules 110. At this time, if the first type of thermally conductive adhesive 140 corresponding to each first heat exchange section 131 adopts the same thermal conductivity, it will not improve the temperature difference between different battery modules 110.

[0127] By adopting the above scheme, by limiting the thermal conductivity of the first type of thermally conductive adhesive 140 near the liquid outlet 122 to be greater than that of the first type of thermally conductive adhesive 140 near the liquid inlet 121, the heat transfer efficiency between the first type of thermally conductive adhesive 140 near the liquid outlet 122 and the battery module 110 is greater than that between the first type of thermally conductive adhesive 140 near the liquid inlet 121 and the battery module 110. Thus, the thermal conductivity of the first type of thermally conductive adhesive 140 is adapted to the position of its corresponding heat exchange channel 123, further balancing the temperature difference between different battery modules 110 in the direction in which the liquid inlet 121 and the liquid outlet 122 are spaced apart.

[0128] It should be noted that the first type of thermally conductive adhesive 140 achieves different thermal conductivity coefficients by varying the amount of thermally conductive filler used. The manufacturing method of the first type of thermally conductive adhesive 140 has been disclosed in related technologies and will not be repeated here.

[0129] In one example of this application, reference is made to Figure 1 and Figure 3 The inlet 121 and outlet 122 are spaced apart along a third direction.

[0130] In some embodiments of this application, reference is made to Figure 6 and Figure 9 The heat exchanger 130 also includes a second heat exchange section 132.

[0131] The second heat exchange section 132 is connected to one end of the first heat exchange section 131 so that the first heat exchange section 131 and the second heat exchange section 132 can exchange heat; the second heat exchange section 132 is also configured to exchange heat with the outside.

[0132] It is understandable that the external part here could be the cover 150 of the battery pack 100 or other heat dissipation structures of the battery pack 100.

[0133] By adopting this scheme, the heat of the battery assembly 110 is transferred to the outside through the cooperation of the second heat exchange section 132 and the first heat exchange section 131, so as to achieve rapid adjustment of the temperature of the battery assembly 110.

[0134] In some embodiments of this application, reference is made to Figure 1 , Figure 2 and Figure 4The second heat exchange section 132 is located on the side of the battery assembly 110 away from the liquid inlet 121.

[0135] By adopting the above solution, by limiting the second heat exchange section 132 to the side of the battery assembly 110 away from the liquid inlet 121, the second heat exchange section 132 can be prevented from affecting the arrangement of the liquid inlet 121 and the cell contact system (CCS) in the battery pack 100.

[0136] In some embodiments of this application, reference is made to Figure 1 , Figure 2 and Figure 4 The second heat exchange section 132 is located on the side of the battery assembly 110 away from the liquid outlet 122.

[0137] By adopting the above solution, by limiting the second heat exchange section 132 to the side of the battery assembly 110 away from the liquid outlet 122, the second heat exchange section 132 can be prevented from affecting the arrangement of the liquid outlet 122 and the cell contact system (CCS) in the battery pack 100.

[0138] It should be noted that, in the third direction, the liquid inlet 121 and the liquid outlet 122 correspond to different positions of the second heat exchange section 132. In other words, at least two sets of battery assemblies 110 are provided in the third direction, wherein one set of battery assemblies 110 is located between the liquid inlet 121 and the second heat exchange section 132, and the other set of battery assemblies 110 is located between the liquid outlet 122 and the second heat exchange section 132.

[0139] In one example of this application, reference is made to Figure 1 , Figure 2 and Figure 4 The first heat exchange section 131 extends from the second heat exchange section 132 toward the liquid inlet 121 or the liquid outlet 122.

[0140] In some other embodiments of this application, the second heat exchange section 132 may be located on the side opposite to the liquid cooling plate 120, or more specifically, the second heat exchange section 132 may be located on top of the battery assembly 110.

[0141] In some embodiments of this application, reference is made to Figures 11 to 13 The battery pack 100 also includes a cover 150. The cover 150 covers at least the battery assembly 110 and the heat exchanger 130; at least a portion of the second heat exchanger 132 is in contact with the cover 150.

[0142] It is understood that the cover 150 is located outside the battery assembly 110 and the heat exchanger 130 to isolate the battery assembly 110 and the heat exchanger 130 from the outside.

[0143] By adopting the above solution, at least a portion of the second heat exchange part 132 contacts the cover 150, and the heat of the battery assembly 110 is conducted to the cover 150, and the cover 150 dissipates heat to the external environment, which is conducive to continuous heat exchange between the heat exchange part 130 and the battery assembly 110.

[0144] It should be noted that the heat dissipation of the case cover 150 can be achieved using conventional heat dissipation methods, such as air cooling and liquid cooling, which will not be elaborated here.

[0145] In some specific embodiments, the second heat exchange section 132 may be in direct contact with the cover 150, or indirect contact through a thermally conductive material (such as thermally conductive adhesive).

[0146] In some embodiments of this application, reference is made to Figure 6 and Figure 9 At least two first heat exchange sections 131 are connected to the same second heat exchange section 132.

[0147] By adopting the above scheme, at least two first heat exchange units 131 are connected through the same second heat exchange unit 132, which facilitates the assembly of the heat exchange unit 130 and the battery assembly 110.

[0148] In one example of this application, a plurality of first heat exchange sections 131 are arranged in the left-right direction in the second heat exchange section 132, and the distance between two adjacent first heat exchange sections 131 can be set accordingly based on the size of the battery assembly 110.

[0149] In some other embodiments of this application, each first heat exchanger 131 may also be connected to only one second heat exchanger 132, that is, each heat exchanger 130 is composed of only one first heat exchanger 131 and one second heat exchanger 132. In such a structure, in order to adapt to at least two battery assemblies 110 in the left and right directions, multiple heat exchangers 130 can be provided in the left and right directions.

[0150] In some embodiments of this application, reference is made to Figure 9 The thickness T2 of the second heat exchange section 132 in the second direction is greater than or equal to the thickness T1 of the first heat exchange section 131 in the third direction.

[0151] By adopting the above solution, by limiting the thickness of the first heat exchange part 131, the installation space required for the first heat exchange part 131 can be reduced, the impact on the installation distance between adjacent battery components 110 can be reduced, and the heat of the battery components 110 can be quickly transferred from the first heat exchange part 131 to the second heat exchange part 132. By limiting the thickness of the second heat exchange part 132, the second heat exchange part 132 can store more heat and provide more stable heat conduction capability.

[0152] In some embodiments of this application, the heat exchanger 130 includes a heat pipe. More specifically, the heat pipe includes a shell and a porous material, such as sintered metal powder, disposed inside the shell. The structure of the heat pipe has been disclosed in related technologies and will not be described in detail here.

[0153] It can be understood that the first heat exchange section 131 constitutes the evaporation section of the heat pipe, while the second heat exchange section 132 constitutes the condensation section of the heat pipe. When the first heat exchange section 131 is heated, the liquid working fluid inside evaporates and vaporizes. The vaporized working fluid flows to the second heat exchange section 132 under the pressure difference between the second heat exchange section 132 and the first heat exchange section 131. In the second heat exchange section 132, heat is released to the cover 150 and condenses into liquid working fluid. Under the capillary force provided by the porous material inside the heat pipe, the liquid working fluid flows back to the first heat exchange section 131. This cycle is repeated to realize the transfer of heat from the first heat exchange section 131 to the second heat exchange section 132.

[0154] By adopting the above scheme, the heat exchanger 130 is made of heat pipes, which has a high heat transfer effect and does not require external power drive, thus having high reliability.

[0155] In other embodiments of this application, the heat exchanger 130 may also be another liquid cooling plate 120 or other thermally conductive materials (such as phase change thermally conductive insulating materials, high thermal conductivity rubber, etc.).

[0156] During the heat exchange process between the heat exchange medium in the heat exchange channel 123 and the battery module 110, the temperature of the heat exchange medium changes, and the temperature of the heat exchange medium is higher closer to the liquid outlet 122, resulting in a decrease in heat exchange efficiency. In other words, there are differences in the heat exchange efficiency between the heat exchange medium and the battery module 110 at different locations in the heat exchange channel 123. In some embodiments of this application, reference is made to... Figure 14 The battery pack 100 includes: a second type of thermally conductive adhesive 160.

[0157] At least two second-type thermally conductive adhesives 160 are respectively disposed between the battery assembly 110 and the liquid cooling plate 120; on the extension path of the heat exchange channel 123, at least two second-type thermally conductive adhesives 160 are arranged in sequence, and the thermal conductivity of the second-type thermally conductive adhesive 160 near the liquid outlet 122 is greater than that of the second-type thermally conductive adhesive 160 near the liquid inlet 121.

[0158] It is understandable that the thermal conductivity of two adjacent second-type thermally conductive adhesives 160 is different along the extension path of the heat exchange channel 123; or along the extension path of the heat exchange channel 123, a preset number of adjacent second-type thermally conductive adhesives 160 are used as a group of thermally conductive adhesives, and the thermal conductivity of each second-type thermally conductive adhesive 160 in each group is the same, while the thermal conductivity of the group of thermally conductive adhesives near the liquid outlet 122 is greater than that of the other group of thermally conductive adhesives near the liquid inlet 121.

[0159] By limiting the thermal conductivity of the second type of thermally conductive adhesive 160 near the liquid outlet 122 to be greater than that near the liquid inlet 121, the thermal conductivity of the second type of thermally conductive adhesive 160 is made compatible with the position of its corresponding heat exchange channel 123. This can compensate for the loss of heat exchange efficiency caused by the temperature change of the heat exchange medium, thereby balancing the heat exchange efficiency at different positions of the heat exchange channel 123, improving the temperature uniformity of different areas in the battery pack 100, and improving the overall performance and service life of the battery pack 100.

[0160] It should be noted that the second type of thermally conductive adhesive 160 achieves different thermal conductivity coefficients by varying the amount of thermally conductive filler used. The manufacturing method of the second type of thermally conductive adhesive 160 has been disclosed in related technologies and will not be repeated here.

[0161] In one example of this application, on a projection plane perpendicular to the first direction, the projection of the second type of thermally conductive adhesive 160 at least partially overlaps with the projection of the flow channel segment 123a. More specifically, each flow channel segment 123a may correspond to 2 to 6 types of second type thermally conductive adhesive 160.

[0162] In some embodiments of this application, along the extension path of the heat exchange channel 123, the thermal conductivity of at least two second-type thermally conductive adhesives 160 increases by a preset coefficient difference.

[0163] It is understandable that the thermal conductivity of two adjacent second-type thermally conductive adhesives 160 is different along the extension path of the heat exchange channel 123.

[0164] By adopting the above scheme, the thermal conductivity of the second type of thermally conductive adhesive 160 is limited to increase by a preset coefficient difference, so that the thermal conductivity of the second type of thermally conductive adhesive 160 is adapted to the temperature change of the heat exchange medium in the heat exchange channel 123, further balancing the heat exchange efficiency at different positions in the heat exchange channel 123 and improving the temperature uniformity of different areas in the battery pack 100.

[0165] In some specific implementations, the preset coefficient is 0.2W / mK to 0.8W / mK. Under such a preset coefficient, the temperature change of the heat exchange medium can be better matched, and the amount of the second type of thermally conductive adhesive 160 can be better controlled.

[0166] In one example of this application, reference is made to Figure 14 Along the extension path of the heat exchange channel 123, the second type of thermally conductive adhesive 160 between the liquid inlet 121 and the liquid outlet 122 are sequentially numbered as N1, N2, N3, N4...Ni, where i is the total number of the second type of thermally conductive adhesive 160. N1 is closest to the liquid inlet 121, while Ni is closest to the liquid outlet 122. The difference in thermal conductivity between two adjacent second type of thermally conductive adhesives 160 is 0.5W / mK.

[0167] In one example of this application, reference is made to Figure 14 The thermal conductivity of N1 is 1.5 W / mK, that of N2 is 2 W / mK, that of N3 is 2.5 W / mK, that of N4 is 3 W / mK, and so on, while that of Ni is 7 W / mK.

[0168] Secondly, this application provides an electrical device including the battery pack 100 as described above. This electrical device possesses all the beneficial effects of the aforementioned battery pack, which will not be elaborated upon here.

[0169] In some specific implementations, the electrical equipment in this application embodiment may be a vehicle, an electrical cabinet, or the like.

[0170] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery pack, characterized in that, include: At least one battery component; A liquid cooling plate is disposed on one side of the battery assembly along a first direction; The heat exchanger is in contact with at least a portion of the battery assembly; The liquid cooling plate has a liquid inlet, a liquid outlet, and a heat exchange channel, wherein the heat exchange channel is connected between the liquid inlet and the liquid outlet. In the second direction, the heat exchanger is spaced apart from the liquid inlet; the second direction intersects with the first direction.

2. The battery pack according to claim 1, characterized in that, The heat exchanger includes: At least two first heat exchange sections are configured to exchange heat with the battery assembly; Wherein, at least two first heat exchange sections are arranged at intervals along a third direction, and there is an accommodating space between two adjacent first heat exchange sections, and at least a portion of the battery assembly is disposed in the accommodating space; The third direction intersects with the first direction and the second direction, respectively.

3. The battery pack according to claim 2, characterized in that, In the first direction, the ratio of the size of the first heat exchange section to the size of the battery assembly ranges from 0.2 to 0.

6.

4. The battery pack according to claim 2, characterized in that, In the second direction, the ratio of the size of the first heat exchange section to the size of the battery assembly ranges from 0.2 to 0.

6.

5. The battery pack according to claim 2, characterized in that, The battery pack also includes: The first type of thermally conductive adhesive is at least partially disposed between the first heat exchange section and the battery assembly.

6. The battery pack according to claim 5, characterized in that, The first heat exchange section includes two heat exchange surfaces arranged opposite each other in a third direction; The first type of thermally conductive adhesive includes: The first part is located on one of the heat exchange surfaces; The second part is another heat exchange surface located in the same first heat exchange section; A transition section connects the first part and the second part; The transition section is disposed around the transition region between the two heat exchange surfaces.

7. The battery pack according to claim 5, characterized in that, In the direction in which the inlet and the outlet are spaced apart, the thermal conductivity of the first type of thermally conductive adhesive near the outlet is greater than or equal to the thermal conductivity of the first type of thermally conductive adhesive near the inlet.

8. The battery pack according to claim 2, characterized in that, The heat exchanger also includes: The second heat exchange section is connected to one end of the first heat exchange section so that the first heat exchange section and the second heat exchange section can exchange heat. The second heat exchange section is also configured to exchange heat with the outside.

9. The battery pack according to claim 8, characterized in that, The second heat exchange section is located on the side of the battery assembly away from the liquid inlet; And / or, the second heat exchange section is located on the side of the battery assembly away from the liquid outlet.

10. The battery pack according to claim 8, characterized in that, The battery pack also includes: The cover shall at least cover the battery assembly and the heat exchanger; At least a portion of the second heat exchange section is in contact with the box cover.

11. The battery pack according to claim 8, characterized in that, At least two of the first heat exchange sections are connected to the same second heat exchange section.

12. The battery pack according to claim 8, characterized in that, The thickness of the second heat exchange part in the second direction is greater than or equal to the thickness of the first heat exchange part in the third direction.

13. The battery pack according to any one of claims 1 to 12, characterized in that, The heat exchanger includes a heat pipe.

14. The battery pack according to any one of claims 1 to 12, characterized in that, The battery pack includes: At least two Class II thermally conductive adhesives are respectively disposed between the battery assembly and the liquid cooling plate; In the heat exchange channel, at least two second-type thermally conductive adhesives are arranged sequentially along the extension path, and the thermal conductivity of the second-type thermally conductive adhesive near the liquid outlet is greater than that of the second-type thermally conductive adhesive near the liquid inlet.

15. The battery pack according to claim 14, characterized in that, Along the extension path of the heat exchange channel, the thermal conductivity of at least two of the second type of thermally conductive adhesives increases by a preset coefficient difference.

16. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 15.

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