Battery pack and power device

Abstract

The embodiments of the present application relate to the field of battery technology, and specifically disclose a battery pack and an electrical device, wherein the battery pack includes: a box body having a receiving cavity; a plurality of single cells arranged in the receiving cavity; a box cover arranged on one side of the box body in the second direction; and a first liquid cooling part arranged in the receiving cavity, and the first liquid cooling part is arranged opposite to the single cells. According to the present application, it is limited to the second direction, and along the direction of the first partition toward the first side wall, the distance between each second partition and the first end wall is reduced to reduce the flow resistance of the coolant in the first liquid cooling channel, thereby reducing the pressure drop of the coolant on the side of the first liquid cooling part close to the first end wall, so as to reduce the flow rate of the coolant in the first liquid cooling channel, prolong the flow time of the coolant in the first liquid cooling channel, improve the heat dissipation effect of the first liquid cooling part, and finally improve the safety performance of the battery pack.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] With the rapid development of the new energy industry, battery packs with high energy density, high cycle life and high safety performance have been widely used and developed, and there is an urgent need for battery packs with larger capacity, longer durability and greater safety. The liquid cooling system is one of the cores of the battery pack. Therefore, how to improve the liquid cooling effect of the liquid cooling system and thus improve the safety performance of the battery pack has become an urgent problem to be solved. Summary of the invention

[0003] Embodiments of the present application provide a battery pack and an electrical device to improve the safety performance of the battery pack.

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In one aspect, a battery pack is provided, having a first direction, a second direction, and a third direction intersecting in pairs, including:

[0006] A box body having a containing cavity;

[0007] A plurality of single cells, wherein the plurality of single cells are arranged in the receiving cavity;

[0008] a box cover, disposed on one side of the box body in the second direction; and

[0009] A first liquid cooling element is disposed in the accommodating cavity, and the first liquid cooling element is disposed opposite to the single battery;

[0010] The first liquid cooling member includes a first end wall and a second end wall spaced apart along a first direction, a first side wall and a second side wall spaced apart along a second direction, and two third side walls spaced apart along a third direction, and the first end wall, the second end wall, the first side wall, the second side wall and the third side wall cooperate to enclose a liquid cooling cavity;

[0011] The first liquid-cooling member further includes: a first partition and a plurality of second partitions, the first partition and the plurality of second partitions are both arranged in the liquid-cooling cavity, the first partition and the second partition both extend along the first direction, the plurality of second partitions are arranged at intervals in the second direction, and the first partition is arranged between two of the second partitions, and the first partition and the plurality of second partitions are configured to divide the liquid-cooling cavity into a plurality of first liquid-cooling channels extending along the first direction;

[0012] The distance between the first partition and the first end wall is greater than the distance between the second partition and the first end wall, and in the second direction and along the direction of the first partition toward the first side wall, the distance between each second partition and the first end wall decreases.

[0013] In addition to or as an alternative to one or more features disclosed above, in the second direction, along the direction of the first partitions toward the second side wall, the distance between each second partition and the first end wall decreases.

[0014] In addition to one or more of the features disclosed above, or as an alternative, the distance between the first partition and the second end wall is greater than the distance between the second partition and the second end wall, and in the second direction, and along the direction of the first partition toward the first side wall, the distance between each second partition and the second end wall decreases.

[0015] In addition to or as an alternative to one or more features disclosed above, in the second direction, along the direction of the first partition toward the second side wall, the distance between each second partition and the second end wall decreases.

[0016] In addition to or as an alternative to one or more of the features disclosed above, a first liquid inlet and a first liquid outlet are provided on the first liquid cooling member, the first liquid inlet is arranged close to the first end wall in the first direction, the first liquid outlet is arranged close to the second end wall in the first direction, and the first liquid inlet and the first liquid outlet are both connected to the first liquid cooling channel;

[0017] The coolant enters the first liquid cooling channel through the first liquid inlet and is discharged through the first liquid outlet.

[0018] In addition to or as an alternative to one or more of the features disclosed above, the single battery has two first outer wall surfaces arranged opposite to each other in a first direction, and two second outer wall surfaces arranged opposite to each other in a third direction, and the first outer wall surfaces and the second outer wall surfaces are connected to each other;

[0019] The first liquid cooling element covers the second outer wall surface.

[0020] In addition to one or more of the features disclosed above, or as an alternative, the single battery further has a third outer wall surface facing the box cover in the second direction, and the third outer wall surface is connected to the first outer wall surface and the second outer wall surface respectively;

[0021] The single cell includes: a pole, which is arranged on the third outer wall surface;

[0022] The battery pack further includes: an electrical connector electrically connected to the pole of the single battery; and

[0023] The second liquid cooling member covers a side of the electrical connector away from the pole, and the second liquid cooling member is thermally connected to the electrical connector.

[0024] In addition to one or more of the features disclosed above, or as an alternative, it also includes: a temperature averaging plate, which is arranged between the electrical connector and the second liquid cooling member, and the temperature averaging plate is thermally connected to the electrical connector and the second liquid cooling member respectively.

[0025] In addition to or as an alternative to one or more of the features disclosed above, the invention further includes: a first thermally conductive adhesive layer disposed between the temperature homogenizing plate and the electrical connector; and

[0026] The second heat-conducting adhesive layer is arranged between the electrical connector and the third outer wall surface.

[0027] In addition to one or more of the features disclosed above, or as an alternative, a second liquid cooling channel is provided in the second liquid cooling member, the second liquid cooling channel extends along the first direction, a second liquid inlet and a second liquid outlet are provided on the second liquid cooling member, the second liquid inlet and the second liquid outlet are respectively arranged at two ends of the second liquid cooling member that are arranged opposite to each other in the first direction, and the second liquid inlet and the second liquid outlet are both connected to the second liquid cooling channel, the second liquid outlet is connected to the first liquid inlet, the second liquid inlet and the first liquid outlet are located on the same side in the first direction, and the second liquid outlet and the first liquid inlet are located on the same side in the first direction;

[0028] The coolant enters the second liquid cooling channel through the second liquid inlet, and the coolant from the second liquid cooling channel enters the first liquid cooling channel through the second liquid outlet and the first liquid inlet, and is then discharged through the first liquid outlet.

[0029] In addition to or as an alternative to one or more of the features disclosed above, the first liquid cooling element and the second liquid cooling element are both provided in plurality, and the plurality of first liquid cooling elements and the plurality of second liquid cooling elements are arranged at intervals in the third direction;

[0030] The battery pack also includes: a first connecting pipe and a second connecting pipe, the first connecting pipe is respectively connected to the second liquid outlet of the second liquid cooling element and the first liquid inlet of the first liquid cooling element, and the second connecting pipe is respectively connected to the first liquid inlets of two adjacent first liquid cooling elements.

[0031] In addition to or as an alternative to one or more of the features disclosed above, the first liquid cooling element and the second liquid cooling element are both provided in plurality, and the plurality of first liquid cooling elements and the plurality of second liquid cooling elements are arranged at intervals in the third direction;

[0032] The battery pack also includes: a third connecting pipe, the third connecting pipe has a first connecting port, a second connecting port and a third connecting port connected to each other, the first connecting port is connected to the second liquid outlet of the second liquid cooling component, and the second connecting port and the third connecting port are respectively connected to the first liquid inlet of different first liquid cooling components.

[0033] In addition to one or more of the features disclosed above, or as an alternative, it also includes: a main liquid inlet pipe and a main liquid outlet pipe, the main liquid inlet pipe is connected to the second liquid inlet of the second liquid cooling component, and the main liquid outlet pipe is connected to the first liquid outlet of the first liquid cooling component.

[0034] On the other hand, an electrical device is further disclosed, which, in addition to or instead of one or more of the features disclosed above, includes an electrical body; and a battery pack as described in any of the above items, wherein the battery pack is arranged on the electrical body, and the battery pack serves as a power supply for the electrical body.

[0035] One of the above technical solutions has the following advantages or beneficial effects: the present application is limited in the second direction, and along the direction of the first partition toward the first side wall, the distance between each second partition and the first end wall is reduced to form a buffer space on the side of the first liquid cooling part close to the first end wall, so that the coolant can be buffered on the side close to the first end wall when entering the liquid cooling cavity, thereby reducing the flow resistance of the coolant in the first liquid cooling channel, and then reducing the pressure drop of the coolant on the side of the first liquid cooling part close to the first end wall, so as to reduce the flow rate of the coolant in the first liquid cooling channel, extend the flow time of the coolant in the first liquid cooling channel, so that the coolant in the first liquid cooling part can better liquid-cool the single battery, thereby improving the heat dissipation effect of the first liquid cooling part, and ultimately improving the safety performance of the battery pack.

[0036] The present application also limits that in the second direction, and along the direction of the first partition toward the first side wall, the distance between each second partition and the second end wall is reduced to form a buffer space on the side of the first liquid cooling part close to the second end wall, so that the coolant can be buffered on the side close to the second end wall, thereby further reducing the flow resistance of the coolant in the first liquid cooling channel, reducing the pressure drop of the coolant on the side of the first liquid cooling part close to the second end wall, further reducing the flow rate of the coolant in the first liquid cooling channel, extending the flow time of the coolant in the first liquid cooling channel, so that the coolant in the first liquid cooling part can better liquid-cool the single battery cells, thereby improving the heat dissipation effect of the first liquid cooling part, and ultimately improving the safety performance of the battery pack.

[0037] The present application also arranges a temperature equalizing plate between the first liquid cooling element and the electrical connector and the heat conductive element, so that the heat generated by the single cell during normal operation is evenly conducted between the first liquid cooling element and the electrical connector and the heat conductive element, thereby achieving uniform cooling of the pole and the first outer wall surface of the single cell by the first liquid cooling element, so as to optimize the liquid cooling effect of the first liquid cooling element and improve the heat dissipation performance of the battery pack; at the same time, the temperature equalizing plate is used to overcome the assembly tolerance problem at the pole of the single cell, ensure the flatness of the battery pack on the pole side of the single cell, and facilitate the overall assembly of the battery pack.

[0038] The present application also ensures that the first liquid cooling component and the second liquid cooling component have consistent liquid cooling and heat dissipation effects on each single battery cell by locating the second liquid inlet and the first liquid outlet on the same side in the first direction, thereby ensuring that the temperature of each single battery cell is consistent during normal operation, thereby optimizing the overall liquid cooling and heat dissipation effect of the battery pack and improving the heat dissipation performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0040] Figure 1 is an exploded structural view of a battery pack provided according to an embodiment of the present application;

[0041] Figure 2 is a three-dimensional structural view of a first liquid cooling element provided according to an embodiment of the present application;

[0042] Figure 3 is a cross-sectional view of a first liquid cooling element provided according to an embodiment of the present application;

[0043] Figure 4 is a three-dimensional structural view of a single cell, a first liquid cooling element, and a second liquid cooling element provided according to an embodiment of the present application;

[0044] Figure 5 is a cross-sectional view of a single cell, a first liquid cooling element, and a second liquid cooling element along the AA direction according to an embodiment of the present application;

[0045] Figure 6 yes Figure 5 A partial enlarged view of point B in the middle;

[0046] Figure 7 is a three-dimensional structural view of a single cell provided according to an embodiment of the present application;

[0047] Figure 8 is a three-dimensional structural view of a first liquid cooling element and a second liquid cooling element provided according to an embodiment of the present application;

[0048] Fig. 9 is a three-dimensional structural view of the first liquid cooling element and the second liquid cooling element from another perspective according to an embodiment of the present application;

[0049] Fig.10 is a three-dimensional structural view of a first liquid cooling element and a second liquid cooling element from another perspective according to another embodiment of the present application;

[0050] Fig.11 is a cross-sectional view of a second liquid cooling component provided according to an embodiment of the present application.

[0051] Description of reference numerals:

[0052] 100. Battery pack;

[0053] 110, box body; 111, accommodating chamber;

[0054] 120, single cell; 121, first outer wall; 122, second outer wall; 123, third outer wall; 124, pole;

[0055] 130. Box cover;

[0056] 141, first liquid cooling member; 1411, first end wall; 1412, second end wall; 1413, first side wall; 1414, third side wall; 1415, liquid cooling chamber; 14151, first liquid cooling channel; 14161, first partition; 14162, second partition; 1417, first liquid inlet; 1418, first liquid outlet; 1419, second side wall; 142, second liquid cooling member; 1421, second liquid cooling channel; 1422, second liquid inlet; 1423, second liquid outlet; 143, first connecting pipe; 144, second connecting pipe; 145, third connecting pipe; 1451, first connecting port; 1452, second connecting port; 1453, third connecting port; 146, total liquid inlet pipe; 147, total liquid outlet pipe;

[0057] 150. Electrical connectors;

[0058] 160. Temperature balancing board;

[0059] 170, a first thermally conductive adhesive layer;

[0060] 180, a second thermal conductive adhesive layer;

[0061] 190. Rubber stopper. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0063] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0064] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0066] With the rapid development of the new energy industry, the demand for fast charging and discharging, and high-rate charging and discharging of battery packs is increasing, which brings higher and higher heat dissipation requirements. In existing battery packs, heat dissipation elements are only arranged on a single surface of the battery to dissipate heat. For example, square batteries, blade batteries, and cylindrical batteries all dissipate heat through the bottom, top, or side wall, with a small heat dissipation area. The existing liquid cooling plate has uneven heat dissipation, which further affects the heat dissipation effect of the battery pack and cannot meet the cooling requirements of high-rate charging and discharging of the battery, affecting the safety performance of the battery pack.

[0067] In order to solve the above problems, in the embodiments of the present application, refer to Figures 1 to 11 The present application provides a battery pack 100, which is used to solve the above-mentioned problems.

[0068] The battery pack 100 has a first direction X, a second direction Z, and a third direction Y that intersect each other. For example, the battery pack 100 has a first direction X, a second direction Z, and a third direction Y that are perpendicular to each other. Here, "perpendicular" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°.

[0069] Specifically, the battery pack 100 includes a box body 110 , single cells 120 , a box cover 130 and a first liquid cooling element 141 .

[0070] Specifically, the box body 110 has a accommodating cavity 111; a plurality of single cells 120 are provided, and the plurality of single cells 120 are arranged in the accommodating cavity 111. Exemplarily, the plurality of single cells 120 are arranged in sequence in the third direction Y to form a battery pack, and the plurality of battery packs are arranged in sequence in the first direction X; the box cover 130 is arranged on one side of the box body 110 in the second direction Z to seal the accommodating cavity 111; the first liquid cooling component 141 is arranged in the accommodating cavity 111, and the first liquid cooling component 141 is arranged opposite to the single cell 120 to achieve liquid cooling and heat dissipation of the single cell 120.

[0071] The battery pack 100 may be a battery pack 100 with three layers of single cells 120-battery module-battery pack, that is, the single cells 120 are first grouped into battery modules, and then the battery modules are placed in the box 110 to form a battery pack; or a battery pack 100 with two layers of single cells 120-battery pack, that is, the single cells 120 are directly placed in the box 110 to form a battery pack. This is not specifically limited in this application, and can be specifically set according to actual circumstances, as long as it does not affect the effect of this application.

[0072] The box body 110 is made of common steel or aluminum, but is not limited thereto.

[0073] The single cell 120 may be a secondary battery, which refers to a single cell that can be used continuously by activating active materials by charging after the single cell is discharged. Exemplarily, the single cell 120 may be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery or a nickel cadmium battery, but is not limited thereto.

[0074] The single battery 120 may be a cylindrical battery, a prismatic battery, a soft-pack battery, or a battery of other shapes.

[0075] The single cell 120 may include a shell, an electrode assembly, an electrolyte, an end cap, a pole and other functional components. The electrolyte may be a conventional electrolyte or a special electrolyte with additives added thereto, and the electrolyte is used to wet the electrode assembly. Among them, the electrode assembly is a component in the single cell 120 where an electrochemical reaction occurs, and the electrode assembly may be one or more. The electrode assembly is mainly formed by stacking or winding a positive electrode sheet, a diaphragm and a negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active substances constitute the electrode body, and the parts of the positive electrode sheet and the negative electrode sheet without active substances each constitute a pole ear. During the charge and discharge process of the single cell 120, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the pole ear is electrically connected to the pole to form a current loop, so that the single cell 120 can be used normally.

[0076] The first liquid cooling element 141 is made of a heat-conducting material. For example, the first liquid cooling element 141 can be made of any one of copper, aluminum or stainless steel, but is not limited thereto.

[0077] The first liquid cooling element 141 can be formed by forming aluminum material using an aluminum extrusion process.

[0078] Specifically, refer to Figures 2 to 3 The first liquid cooling member 141 includes: a first end wall 1411 , a second end wall 1412 , a first side wall 1413 , a second side wall 1419 , a third side wall 1414 , a first partition 14161 , and a second partition 14162 .

[0079] The first end wall 1411 and the second end wall 1412 are arranged at intervals along the first direction X, the first side wall 1413 and the second side wall 1419 are arranged at intervals along the second direction Z, two third side walls 1414 are provided, and the two third side walls 1414 are arranged at intervals along the third direction Y, and the first end wall 1411, the second end wall 1412, the first side wall 1413, the second side wall 1419 and the third side wall 1414 cooperate to enclose a liquid cooling chamber 1415.

[0080] There are multiple second partitions 14162, multiple first partitions 14161 are arranged in the liquid cooling cavity 1415, the first partition 14161 and the multiple second partitions 14162 are both arranged in the liquid cooling cavity 1415, the first partition 14161 and the second partition 14162 are both extended along the first direction X, the multiple second partitions 14162 are arranged at intervals in the second direction Z, and the first partition 14161 is arranged between two of the second partitions 14162, the first partition 14161 and the multiple second partitions 14162 are configured to divide the liquid cooling cavity 1415 into multiple first liquid cooling channels 14151 extending along the first direction X, and the first liquid cooling channels 14151 are used for circulation of cooling liquid.

[0081] There may be only one first partition 14161, and the first partition 14161 may be disposed between any two adjacent second partitions 14162. There may also be multiple first partitions 14161, the lengths of the multiple first partitions 14161 in the first direction X are the same, and the multiple first partitions 14161 are disposed between any two adjacent second partitions 14162.

[0082] Specifically, the distance between the first partition 14161 and the first end wall 1411 is greater than the distance between the second partition 14162 and the first end wall 1411 . Specifically, in the second direction Z, and along the direction of the first partition 14161 toward the first side wall 1413, the distance between each second partition 14162 and the first end wall 1411 is reduced, that is, a buffer space is formed on the side of the first liquid-cooling component 141 close to the first end wall 1411, so that the coolant can be buffered on the side close to the first end wall 1411 when entering the liquid-cooling cavity 1415, thereby reducing the flow resistance of the coolant in the first liquid-cooling channel 14151, and further reducing the pressure drop of the coolant on the side of the first liquid-cooling component 141 close to the first end wall 1411, so as to reduce the flow rate of the coolant in the first liquid-cooling channel 14151, extend the flow time of the coolant in the first liquid-cooling channel 14151, so that the coolant in the first liquid-cooling component 141 can better liquid-cool the single battery 120, thereby improving the heat dissipation effect of the first liquid-cooling component 141, and ultimately improving the safety performance of the battery pack 100.

[0083] Further, in one embodiment, referring to Figures 2 to 3 In the second direction Z, along the direction of the first partition 14161 toward the second side wall 1419, the distance between each second partition 14162 and the first end wall 1411 is reduced, so as to further form an arc-shaped buffer space on the side of the first liquid-cooling member 141 close to the first end wall 1411, so that the coolant can be buffered on the side close to the first end wall 1411 when entering the liquid-cooling cavity 1415, thereby improving the buffering effect of the coolant on the side of the first liquid-cooling member 141 close to the first end wall 1411, thereby The flow resistance of the coolant in the first liquid-cooling channel 14151 is reduced, and the pressure drop of the coolant on the side of the first liquid-cooling component 141 close to the first end wall 1411 is reduced, so as to reduce the flow rate of the coolant in the first liquid-cooling channel 14151 and extend the flow time of the coolant in the first liquid-cooling channel 14151, so that the coolant in the first liquid-cooling component 141 can better liquid-cool the single battery 120, thereby improving the heat dissipation effect of the first liquid-cooling component 141 and ultimately improving the safety performance of the battery pack 100.

[0084] In another embodiment, the buffer space on the side of the first liquid-cooling part 141 close to the first end wall 1411 is not limited to the above-mentioned structure. Other buffer structures may include, for example, the first partition 14161 is disposed between the second partition 14162 and the first side wall 1413, and the distance between each second partition 14162 and the first end wall 1411 is reduced along the direction of the first partition 14161 toward the second side wall 1419; or, the first partition 14161 is disposed between the second partition 14162 and the second side wall 1419, and the distance between each second partition 14162 and the first end wall 1411 is reduced along the direction of the first partition 14161 toward the first side wall 1413, but is not limited thereto. An arc-shaped buffer space may also be formed on the side of the first liquid-cooling part 141 close to the first end wall 1411 to achieve the above-mentioned effect, which should also be regarded as an embodiment of the present application.

[0085] In one embodiment, referring to Figures 2 to 3 , the distance between the first partition 14161 and the second end wall 1412 is greater than the distance between the second partition 14162 and the second end wall 1412, and in the second direction Z, and along the direction of the first partition 14161 toward the first side wall 1413, the distance between each second partition 14162 and the second end wall 1412 decreases, that is, a buffer space is formed on the side of the first liquid cooling member 141 close to the second end wall 1412, so that the coolant can be buffered on the side close to the second end wall 1412, thereby The flow resistance of the coolant in the first liquid-cooling channel 14151 is further reduced, and the pressure drop of the coolant on the side of the first liquid-cooling component 141 close to the second end wall 1412 is reduced, so as to further reduce the flow rate of the coolant in the first liquid-cooling channel 14151 and extend the flow time of the coolant in the first liquid-cooling channel 14151, so that the coolant in the first liquid-cooling component 141 can better liquid-cool the single battery 120, thereby improving the heat dissipation effect of the first liquid-cooling component 141 and ultimately improving the safety performance of the battery pack 100.

[0086] Further, in one embodiment, referring to Figures 2 to 3In the second direction Z, along the direction of the first partition 14161 toward the second side wall 1419, the distance between each second partition 14162 and the second end wall 1412 is reduced, so as to further form an arc-shaped buffer space on the side of the first liquid-cooling member 141 close to the second end wall 1412, so that the coolant can be buffered on the side close to the second end wall 1412 when entering the liquid-cooling cavity 1415, thereby improving the buffering effect of the coolant on the side of the first liquid-cooling member 141 close to the second end wall 1412, and further The flow resistance of the coolant in the first liquid-cooling channel 14151 is reduced, and the pressure drop of the coolant on the side of the first liquid-cooling component 141 close to the second end wall 1412 is reduced to reduce the flow rate of the coolant in the first liquid-cooling channel 14151 and extend the flow time of the coolant in the first liquid-cooling channel 14151, so that the coolant in the first liquid-cooling component 141 can better liquid-cool the single battery 120, thereby improving the heat dissipation effect of the first liquid-cooling component 141 and ultimately improving the safety performance of the battery pack 100.

[0087] In another embodiment, the buffer space on the side of the first liquid-cooling part 141 close to the second end wall 1412 is not limited to the above-mentioned structure. Other buffer structures, for example, the first partition 14161 is arranged between the second partition 14162 and the first side wall 1413, and the distance between each second partition 14162 and the second end wall 1412 is reduced along the direction of the first partition 14161 toward the second side wall 1419; or, the first partition 14161 is arranged between the second partition 14162 and the second side wall 1419, and the distance between each second partition 14162 and the second end wall 1412 is reduced along the direction of the first partition 14161 toward the first side wall 1413, but not limited to this, an arc-shaped buffer space can also be formed on the side of the first liquid-cooling part 141 close to the second end wall 1412 to achieve the above-mentioned effect, which should also be regarded as an embodiment of the present application.

[0088] In one embodiment, referring to Figures 2 to 3 A first liquid inlet 1417 and a first liquid outlet 1418 are provided on the first liquid cooling member 141. The first liquid inlet 1417 is arranged close to the first end wall 1411 in the first direction X, that is, an arc-shaped buffer space is formed at the first liquid inlet 1417 of the first liquid cooling member 141. The first liquid outlet 1418 is arranged close to the second end wall 1412 in the first direction X, that is, an arc-shaped buffer space is formed at the first liquid outlet 1418 of the first liquid cooling member 141, so as to reduce the flow resistance of the coolant in the first liquid cooling channel 14151, reduce the flow rate of the coolant in the first liquid cooling channel 14151, and extend the flow time of the coolant in the first liquid cooling channel 14151, so that the coolant in the first liquid cooling member 141 can better perform liquid cooling and heat dissipation on the single battery 120, thereby improving the heat dissipation effect of the first liquid cooling member 141, and finally improving the safety performance of the battery pack 100.

[0089] The first liquid inlet 1417 and the first liquid outlet 1418 are both connected to the first liquid cooling channel 14151 . The cooling liquid enters the first liquid cooling channel 14151 through the first liquid inlet 1417 and is discharged through the first liquid outlet 1418 .

[0090] In one embodiment, referring to Figures 4 to 7 The single cell 120 has two first outer wall surfaces 121 arranged opposite to each other in the first direction X, and two second outer wall surfaces 122 arranged opposite to each other in the third direction Y, and the first outer wall surface 121 and the second outer wall surface 122 are connected to each other; the first liquid cooling component 141 covers the second outer wall surface 122, so that the first liquid cooling component 141 is used to perform liquid cooling on the second outer wall surface 122 of the single cell 120 to dissipate heat, thereby improving the liquid cooling efficiency of the single cell 120, thereby improving the liquid cooling efficiency of the battery pack 100, reducing the temperature rise of the battery pack 100 during normal operation, and improving the safety performance of the battery pack 100.

[0091] A thermally conductive adhesive layer may be provided between the first liquid cooling element 141 and the second outer wall surface 122 to optimize the thermal conductivity between the two, thereby improving the heat conduction efficiency between the first liquid cooling element 141 and the second outer wall surface 122, and ensuring that the first liquid cooling element 141 can better perform liquid cooling on the single battery 120.

[0092] In another embodiment, the first liquid cooling element 141 may also cover the first outer wall surface 121 of the single battery 120 to liquid-cool the first outer wall surface 121 of the single battery 120 to dissipate heat.

[0093] In one embodiment, referring to Figures 4 to 7 The single battery 120 further has a third outer wall surface 123 facing the box cover 130 in the second direction Z, and the third outer wall surface 123 is connected to the first outer wall surface 121 and the second outer wall surface 122 respectively.

[0094] Specifically, the single battery 120 includes a pole 124 , and the pole 124 is disposed on the third outer wall surface 123 .

[0095] Specifically, in order to improve the liquid cooling performance of the battery pack 100, in the present application, the battery pack 100 also includes: an electrical connector 150 and a second liquid cooler 142; the electrical connector 150 is electrically connected to the poles 124 of two adjacent single batteries 120 respectively; the second liquid cooler 142 covers the side of the electrical connector 150 away from the pole 124, and the second liquid cooler 142 is thermally connected to the electrical connector 150.

[0096] Among them, the above-mentioned pole 124 is considered to be a positive pole, and can also be a negative pole. There is no specific limitation in this application and it can be selected according to actual circumstances.

[0097] The pole 124 can be made of conductive metal or other materials, but is not limited thereto. For example, the pole 124 can be made of metal copper or aluminum, but is not limited thereto.

[0098] The electrical connector 150 may be made of conductive metal or other materials, but is not limited thereto. For example, the electrical connector 150 may be made of metal copper or aluminum, but is not limited thereto.

[0099] The second liquid cooling member 142 is made of a heat-conducting material. For example, the second liquid cooling member 142 may be made of any one of copper, aluminum or stainless steel, but is not limited thereto.

[0100] The second liquid cooling member 142 can be formed by forming an aluminum material using an aluminum extrusion process.

[0101] It can be understood that the present application forms a heat dissipation structure of pole 124-electrical connector 150-second liquid cooling member 142 by setting a second liquid cooling member 142 to be thermally connected with the electrical connector 150, so as to ensure that the pole 124 can be fully utilized for heat dissipation when the single cell 120 is working normally, so that the second liquid cooling member 142 can be used to liquid-cool the single cell 120, so that the first liquid cooling member 141 and the second liquid cooling member 142 can respectively perform liquid cooling on different outer wall surfaces of the single cell 120, thereby further improving the liquid cooling efficiency of the single cell 120, and then improving the liquid cooling efficiency of the battery pack 100, reducing the temperature rise of the battery pack 100 during normal operation, and improving the safety performance of the battery pack 100.

[0102] In one embodiment, in order to optimize the heat conduction effect between the second liquid cooling element 142 and the electrical connector 150, in the present application, reference is made to Figures 5 and 6 The battery pack 100 further includes: a temperature averaging plate 160 , which is disposed between the electrical connector 150 and the second liquid cooling member 142 , and the temperature averaging plate 160 is thermally connected to the electrical connector 150 and the second liquid cooling member 142 , respectively.

[0103] The present application arranges a temperature equalizing plate 160 between the second liquid cooling member 142 and the electrical connector 150 so that the heat generated by the single cell 120 during normal operation is evenly conducted between the second liquid cooling member 142 and the electrical connector 150, thereby achieving uniform cooling of the pole 124 of the single cell 120 by the second liquid cooling member 142, thereby optimizing the liquid cooling effect of the second liquid cooling member 142 and improving the heat dissipation performance of the battery pack 100; at the same time, the temperature equalizing plate 160 is used to overcome the assembly tolerance problem at the pole 124 of the single cell 120, thereby ensuring the flatness of the battery pack 100 on one side of the pole 124 of the single cell 120, and facilitating the overall assembly of the battery pack 100.

[0104] In one embodiment, in order to optimize the heat conduction effect between the temperature plate 160 and the electrical connector 150, and between the electrical connector 150 and the single battery 120, in this application, reference is made to Figures 5 and 6 The battery pack 100 further includes: a first thermal conductive adhesive layer 170 and a second thermal conductive adhesive layer 180 .

[0105] Specifically, the first thermally conductive adhesive layer 170 is arranged between the temperature averaging plate 160 and the electrical connector 150, and the first thermally conductive adhesive layer 170 is thermally connected to the temperature averaging plate 160 and the electrical connector 150 respectively; the second thermally conductive adhesive layer 180 is arranged between the electrical connector 150 and the third outer wall surface 123, and the second thermally conductive adhesive layer 180 is thermally connected to the electrical connector 150 and the third outer wall surface 123 respectively.

[0106] The first thermally conductive adhesive layer 170 may be made of any one of silicone thermally conductive adhesive, polyurethane thermally conductive adhesive, silicone potting adhesive thermally conductive adhesive or acrylic thermally conductive adhesive, but is not limited thereto.

[0107] The second thermal conductive adhesive layer 180 may be made of any one of silicone thermal conductive adhesive, polyurethane thermal conductive adhesive, silicone potting adhesive thermal conductive adhesive or acrylic thermal conductive adhesive, but is not limited thereto.

[0108] The materials of the first thermal conductive adhesive layer 170 and the second thermal conductive adhesive layer 180 may be the same or different, and this application does not make any specific limitation thereto, and the materials may be specifically configured according to actual circumstances.

[0109] It can be understood that the present application sets a first thermally conductive adhesive layer 170 between the temperature equalizing plate 160 and the electrical connector 150 to ensure that when the single cell 120 works normally, the first thermally conductive adhesive layer 170 is used to strengthen the heat transfer between the temperature equalizing plate 160 and the electrical connector 150, thereby improving the heat conduction efficiency between the temperature equalizing plate 160 and the electrical connector 150, so as to ensure that the second liquid cooling component 142 can better perform liquid cooling on the single cell 120 and improve the heat dissipation effect of the single cell 120.

[0110] At the same time, the present application sets a second thermally conductive adhesive layer 180 between the electrical connector 150 and the third outer wall surface 123 to ensure that when the single cell 120 works normally, the second thermally conductive adhesive layer 180 is used to strengthen the heat transfer between the electrical connector 150 and the third outer wall surface 123, thereby improving the heat conduction efficiency between the electrical connector 150 and the third outer wall surface 123, so as to ensure that the second liquid cooling component 142 can better dissipate heat from the third outer wall surface 123, thereby improving the liquid cooling heat dissipation effect at the third outer wall surface 123, and thereby improving the overall heat dissipation effect of the single cell 120.

[0111] In one embodiment, referring to Figures 5 and 6The first thermally conductive adhesive layer 170 is provided with adhesive blocking members 190 on both sides of the third direction Y to prevent the thermally conductive adhesive at the first thermally conductive adhesive layer 170 from overflowing to other components in the battery pack 100, thereby ensuring the normal assembly of the battery pack 100 and the normal use of the battery pack 100.

[0112] Exemplarily, the rubber blocking member 190 may be rubber blocking foam, but is not limited thereto.

[0113] In one embodiment, referring to Figure 2 , Figure 3 , Figures 8 to 11 A second liquid cooling channel 1421 is provided in the second liquid cooling member 142. The second liquid cooling channel 1421 is used for circulating the cooling liquid. The second liquid cooling channel 1421 extends along the first direction X. A second liquid inlet 1422 and a second liquid outlet 1423 are provided on the second liquid cooling member 142. The second liquid inlet 1422 and the second liquid outlet 1423 are respectively arranged at two ends of the second liquid cooling member 142 that are opposite to each other in the first direction X. The second liquid inlet 1422 and the second liquid outlet 1423 are both connected to the second liquid cooling channel 1421, and the second liquid outlet 1423 is connected to the first liquid inlet 1417.

[0114] Specifically, the second liquid inlet 1422 and the first liquid outlet 1418 are located on the same side in the first direction X, and the second liquid outlet 1423 and the first liquid inlet 1417 are located on the same side in the first direction X.

[0115] Specifically, the coolant enters the second liquid cooling channel 1421 through the second liquid inlet 1422 , and the coolant from the second liquid cooling channel 1421 enters the first liquid cooling channel 14151 through the second liquid outlet 1423 and the first liquid inlet 1417 , and is then discharged through the first liquid outlet 1418 .

[0116] It can be understood that the temperature of the coolant is lowest when it is transported to the second liquid inlet 1422. When the coolant flows to the second liquid outlet 1423 and the first liquid inlet 1417, the coolant temperature increases due to the heat exchange between the coolant and the single battery 120 in the second liquid cooling channel 1421. When the coolant flows to the first liquid outlet 1418, the coolant temperature increases again due to the heat exchange between the coolant and the single battery 120 in the first liquid cooling channel 14151.

[0117] The present application ensures that the first liquid cooling component 141 and the second liquid cooling component 142 have consistent liquid cooling and heat dissipation effects on each single battery 120, thereby ensuring that the temperature of each single battery 120 is consistent during normal operation, thereby optimizing the overall liquid cooling and heat dissipation effect of the battery pack 100, and improving the heat dissipation performance of the battery pack 100.

[0118] In one embodiment, referring to Figures 8 to 10 , a plurality of the first liquid cooling members 141 and the second liquid cooling members 142 are provided, and the plurality of first liquid cooling members 141 and the plurality of second liquid cooling members 142 are arranged at intervals in the third direction Y. In the present application, a plurality of first liquid cooling members 141 and a plurality of second liquid cooling members 142 are provided to jointly dissipate liquid heat of the single battery 120 by using the plurality of first liquid cooling members 141 and the plurality of second liquid cooling members 142 to improve the liquid cooling effect of the battery pack 100, thereby improving the heat dissipation performance of the battery pack 100.

[0119] Specifically, refer to Figures 8 to 9 The battery pack 100 further includes: a first connecting tube 143 and a second connecting tube 144, the first connecting tube 143 is respectively connected to the second liquid outlet 1423 of the second liquid cooling element 142 and the first liquid inlet 1417 of the first liquid cooling element 141, and the second connecting tube 144 is respectively connected to the first liquid inlets 1417 of two adjacent first liquid cooling elements 141.

[0120] The present application realizes the connection between the first liquid-cooling channel 14151 and the second liquid-cooling channel 1421 through the first connecting tube 143, and realizes the connection between two adjacent first liquid-cooling channels 14151 through the second connecting tube 144. While ensuring the flow direction of the coolant, the connection between the liquid-cooling channels is realized with a simple structure, which facilitates the overall assembly of the battery pack and reduces the production cost. At the same time, the first connecting tube 143 and the second connecting tube 144 occupy little space, thereby optimizing the overall layout of the battery pack 100 and making the overall layout of the battery pack 100 more reasonable and compact.

[0121] In one embodiment, in the present application, both ends of the first connecting tube 143 and both ends of the second connecting tube 144 may also be provided with quickly detachable connectors to enable quick disassembly and assembly between the first connecting tube 143 and the second liquid cooling component 142 and the first liquid cooling component 141, thereby improving the assembly efficiency of the battery pack 100.

[0122] In another embodiment, referring to Figure 8 and Fig.10The first liquid cooling element 141 and the second liquid cooling element 142 are both provided in plurality, and the plurality of first liquid cooling elements 141 and the plurality of second liquid cooling elements 142 are arranged at intervals in the third direction Y.

[0123] Specifically, the battery pack 100 also includes: a third connecting tube 145, the third connecting tube 145 has a first connecting port 1451, a second connecting port 1452 and a third connecting port 1453 that are connected to each other, the first connecting port 1451 is connected to the second liquid outlet 1423 of the second liquid cooling component 142, and the second connecting port 1452 and the third connecting port 1453 are respectively connected to the first liquid inlet 1417 of different first liquid cooling components 141.

[0124] The present application sets a third connecting tube 145 to achieve communication between the first liquid-cooling channel 14151 and multiple second liquid-cooling channels 1421. While ensuring the flow direction of the coolant, a simple structure is used to achieve communication between the liquid-cooling channels, which facilitates the overall assembly of the battery pack and reduces production costs. At the same time, it simplifies the connection structure between the first liquid-cooling component 141 and the second liquid-cooling component 142, improves the connection and assembly efficiency between the first liquid-cooling component 141 and the second liquid-cooling component 142, and thus improves the assembly efficiency of the battery pack 100.

[0125] Specifically, the first connecting port 1451 , the second connecting port 1452 and the third connecting port 1453 of the third connecting tube 145 may be provided with quickly detachable connectors to enable quick disassembly and assembly between the third connecting tube 145 , the second liquid cooling component 142 and the first liquid cooling component 141 , thereby improving the assembly efficiency of the battery pack 100 .

[0126] In one embodiment, referring to Figure 8 The battery pack 100 further includes: a main liquid inlet pipe 146 and a main liquid outlet pipe 147 , the main liquid inlet pipe 146 is connected to the second liquid inlet port 1422 of the second liquid cooling element 142 , and the main liquid outlet pipe 147 is connected to the first liquid outlet port 1418 of the first liquid cooling element 141 .

[0127] Among them, the main liquid inlet pipe 146 and the main liquid outlet pipe 147 are both connected to the liquid storage device outside the battery pack 100, and the liquid storage device is used to provide cooling liquid.

[0128] Specifically, the coolant in the liquid storage device is transported to the main liquid inlet pipe 146, and the coolant from the main liquid inlet pipe 146 enters the second liquid cooling channel 1421 through the second liquid inlet port 1422, so as to circulate in the second liquid cooling channel 1421 for liquid cooling and heat dissipation, and the coolant from the second liquid cooling channel 1421 enters the first liquid cooling channel 14151 through the second liquid outlet port 1423 and the first liquid inlet port 1417, so as to circulate in the first liquid cooling channel 14151 for liquid cooling and heat dissipation, and is discharged to the main liquid outlet pipe 147 through the first liquid outlet port 1418, and the coolant from the main liquid outlet pipe 147 is discharged to the liquid storage device to form a liquid cooling cycle.

[0129] The present application provides a main liquid inlet pipe 146 and a main liquid outlet pipe 147 to achieve synchronous control of multiple first liquid cooling components 141 and second liquid cooling components 142 , thereby improving the cooling control efficiency of the first liquid cooling components 141 and the second liquid cooling components 142 .

[0130] On the other hand, in an embodiment of the present application, the present application also provides an electrical device, including: an electrical body; and a battery pack 100 as described in any of the above embodiments, the battery pack 100 is arranged on the electrical body, and the battery pack 100 serves as a power supply for the electrical body.

[0131] Among them, electrical devices may include but are not limited to mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0132] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery pack having a first direction, a second direction and a third direction intersecting each other, characterized in that: include: A box body having a containing cavity; A box cover, arranged on one side of the box body in the second direction; A plurality of single cells, the plurality of single cells are arranged in the accommodating cavity, the single cells further have a third outer wall surface facing the box cover in the second direction, the single cells include: a pole, arranged on the third outer wall surface; An electrical connector, the electrical connector being electrically connected to the pole of the single battery; A first liquid cooling element is disposed in the accommodating cavity, and the first liquid cooling element is disposed opposite to the single battery; a second liquid cooling element, covering a side of the electrical connector away from the pole, and the second liquid cooling element is thermally connected to the electrical connector; and A temperature averaging plate is disposed between the electrical connector and the second liquid cooling element, and the temperature averaging plate is thermally connected to the electrical connector and the second liquid cooling element respectively; The first liquid cooling member includes a first end wall and a second end wall spaced apart along the first direction, a first side wall and a second side wall spaced apart along the second direction, and two third side walls spaced apart along the third direction, wherein the first end wall, the second end wall, the first side wall, the second side wall and the third side wall cooperate to enclose a liquid cooling cavity; The first liquid-cooling member further includes: a first partition and a plurality of second partitions, the first partition and the plurality of second partitions are both arranged in the liquid-cooling cavity, the first partition and the second partition both extend along the first direction, the plurality of second partitions are arranged at intervals in the second direction, and the first partition is arranged between two of the second partitions, the first partition and the plurality of second partitions are configured to divide the liquid-cooling cavity into a plurality of first liquid-cooling channels extending along the first direction; The distance between the first partition and the first end wall is greater than the distance between the second partition and the first end wall, and in the second direction and along the direction of the first partition toward the first side wall, the distance between each second partition and the first end wall decreases; A first liquid inlet and a first liquid outlet are provided on the first liquid cooling member, and the first liquid inlet and the first liquid outlet are both connected to the first liquid cooling channel; A second liquid cooling channel is provided in the second liquid cooling member, the second liquid cooling channel extends along the first direction, a second liquid inlet and a second liquid outlet are provided on the second liquid cooling member, the second liquid inlet and the second liquid outlet are respectively arranged at two opposite ends of the second liquid cooling member in the first direction, and the second liquid inlet and the second liquid outlet are both connected to the second liquid cooling channel, the second liquid outlet is connected to the first liquid inlet, the second liquid inlet and the first liquid outlet are located on the same side in the first direction, and the second liquid outlet and the first liquid inlet are located on the same side in the first direction; The coolant enters the second liquid-cooling channel through the second liquid inlet, and the coolant from the second liquid-cooling channel enters the first liquid-cooling channel through the second liquid outlet and the first liquid inlet, and is discharged through the first liquid outlet; A plurality of the first liquid cooling element and a plurality of the second liquid cooling element are provided, and the plurality of the first liquid cooling elements and the plurality of the second liquid cooling elements are arranged at intervals in the third direction; The battery pack further includes: a first connecting pipe and a second connecting pipe, the first connecting pipe is respectively connected to the second liquid outlet of the second liquid cooling element and the first liquid inlet of the first liquid cooling element, and the second connecting pipe is respectively connected to the first liquid inlets of two adjacent first liquid cooling elements.

2. The battery pack according to claim 1, characterized in that: In the second direction, along the direction from the first partitions toward the second side wall, the distance between each of the second partitions and the first end wall decreases.

3. The battery pack according to claim 1, wherein: The distance between the first partition and the second end wall is greater than the distance between the second partition and the second end wall, and in the second direction and along the direction of the first partition toward the first side wall, the distance between each second partition and the second end wall decreases.

4. The battery pack according to claim 3, characterized in that: In the second direction, along the direction from the first partitions toward the second side wall, the distance between each of the second partitions and the second end wall decreases.

5. The battery pack according to claim 3, characterized in that: The first liquid inlet is arranged close to the first end wall in the first direction, and the first liquid outlet is arranged close to the second end wall in the first direction; The coolant enters the first liquid cooling channel through the first liquid inlet and is then discharged through the first liquid outlet.

6. The battery pack according to claim 5, characterized in that: The single battery has two first outer wall surfaces arranged opposite to each other in the first direction, and two second outer wall surfaces arranged opposite to each other in the third direction, and the first outer wall surfaces and the second outer wall surfaces are connected to each other; The first liquid cooling member covers the second outer wall surface.

7. The battery pack according to claim 1, characterized in that: Also includes: A first thermally conductive adhesive layer is disposed between the temperature averaging plate and the electrical connector; as well as The second thermally conductive adhesive layer is disposed between the electrical connector and the third outer wall surface.

8. The battery pack according to claim 1, wherein: Also includes: A total liquid inlet pipe and a total liquid outlet pipe, wherein the total liquid inlet pipe is connected to the second liquid inlet of the second liquid cooling component, and the total liquid outlet pipe is connected to the first liquid outlet of the first liquid cooling component.

9. An electrical device, characterized in that: include: Electricity-consuming entity; as well as The battery pack according to any one of claims 1 to 8, wherein the battery pack is arranged on the power-consuming body, and the battery pack serves as a power supply for the power-consuming body.

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