Battery pack and electric device

Abstract

The embodiment of the utility model relates to the technical field of batteries, and particularly discloses a battery pack and a power utilization device, and the battery pack comprises a box body which is provided with a containing cavity; the box cover is arranged on one side of the box body in the first direction; the plurality of single batteries are arranged in the accommodating cavity, each single battery comprises a battery body and a pole, the battery body is provided with a first outer wall surface close to the box cover, and the pole is arranged on the first outer wall surface; the electric connecting pieces are electrically connected with the pole columns of the single batteries; the heat conducting piece is arranged on one side of the electric connecting piece in the second direction, the heat conducting piece is arranged opposite to the first outer wall surface, and the heat conducting piece is in heat conducting connection with the first outer wall surface; and the first liquid cooling piece is arranged on one side, far away from the pole, of the electric connecting piece, and the first liquid cooling piece is in heat conduction connection with the electric connecting piece and the heat conduction piece. According to the battery pack, the heat dissipation structure of the single batteries in the battery pack is optimized, the heat dissipation performance of the battery pack is improved, and finally the safety performance of the battery pack is improved.

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, long cycle life, and high safety performance have been widely used and developed. There is an urgent demand for battery packs with larger capacity, greater durability, and improved safety. Liquid cooling systems are a core component of battery packs. Therefore, how to improve the liquid cooling system's heat dissipation and, therefore, the safety performance of battery packs, has become a pressing issue. Utility Model Content

[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 orientation, comprising: a box body provided with a receiving cavity;

[0006] A box cover is arranged on one side of the box body in the first direction;

[0007] A plurality of single cells are arranged in the accommodating cavity, and the single cells include: a battery body and a pole, the battery body has a first outer wall surface arranged near the box cover, and the pole is arranged on the first outer wall surface;

[0008] An electrical connector electrically connected to a pole of a single battery;

[0009] a heat conducting member disposed on a side of the electrical connector close to the first outer wall in the first direction, the heat conducting member being disposed opposite to the first outer wall, and the heat conducting member being thermally connected to the electrical connector and the first outer wall respectively; and

[0010] The liquid cooling unit includes: a first liquid cooling element, which is arranged on a side of the electrical connector away from the pole, and the first liquid cooling element is thermally connected to the electrical connector.

[0011] In addition to or as an alternative to one or more of the features disclosed above, the electrical connector is integrally formed with the thermal conductor.

[0012] In addition to one or more features disclosed above, or as an alternative, it also includes: a first thermally conductive adhesive layer, which is arranged between the thermally conductive component and the first outer wall surface, and the first thermally conductive adhesive layer is thermally connected to the thermally conductive component and the first outer wall surface respectively.

[0013] In addition to or as an alternative to one or more of the features disclosed above, the present invention further includes: a temperature averaging plate disposed between the first liquid cooling element and the electrical connector, wherein the temperature averaging plate is thermally connected to the electrical connector and the first liquid cooling element respectively; and

[0014] The second thermal conductive adhesive layer is arranged between the temperature homogenizing plate and the electrical connector.

[0015] In addition to or as an alternative to one or more features disclosed above, the battery pack further has a second direction and a third direction intersecting the first direction in pairs;

[0016] The battery body further comprises two second outer walls arranged opposite to each other in the third direction, and two third outer walls arranged opposite to each other in the second direction, wherein the first outer wall, the second outer wall and the third outer wall are connected in pairs;

[0017] The liquid cooling unit further includes a second liquid cooling element, which covers at least a portion of the third outer wall surface.

[0018] In addition to or as an alternative to one or more of the features disclosed above, a first liquid cooling channel is defined in the first liquid cooling element, the first liquid cooling channel extends along a third direction, a first liquid inlet and a first liquid outlet are defined on the first liquid cooling element, the first liquid inlet and the first liquid outlet are respectively disposed at opposite ends of the first liquid cooling element in the third direction, and both the first liquid inlet and the first liquid outlet are in communication with the first liquid cooling channel;

[0019] A second liquid-cooling channel is defined in the second liquid-cooling element, the second liquid-cooling channel extending along a third direction. A second liquid inlet and a second liquid outlet are defined on the second liquid-cooling element, the second liquid inlet and the second liquid outlet being disposed at opposite ends of the second liquid-cooling element in the third direction, and both the second liquid inlet and the second liquid outlet being in communication with the second liquid-cooling channel.

[0020] The first liquid inlet and the second liquid outlet are located on the same side in the third direction, the first liquid outlet and the second liquid inlet are located on the same side in the third direction, and the first liquid outlet is communicated with the second liquid inlet.

[0021] 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 second direction;

[0022] The liquid cooling unit further includes a first connecting pipe and a second connecting pipe, wherein the first connecting pipe is connected to the first liquid outlet of the first liquid cooling element and the second liquid inlet of the second liquid cooling element respectively, and the second connecting pipe is connected to the second liquid inlets of two adjacent second liquid cooling elements respectively.

[0023] In addition to one or more of the features disclosed above, or as an alternative, the liquid cooling unit further includes: a plurality of connectors, which are respectively arranged at the end of the first connecting pipe and the end of the second connecting pipe, and the connectors are respectively detachably connected to the first liquid cooling part and the second liquid cooling part.

[0024] In addition to or as an alternative to one or more of the features disclosed above, the connector includes: a connecting body, disposed on any one of the first connecting pipe and the second connecting pipe, and having a connecting channel defined therein; and

[0025] A locking portion, movably disposed on the connecting body;

[0026] The liquid cooling unit further includes: a plurality of connecting parts, the plurality of connecting parts being respectively arranged at the first liquid outlet of the first liquid cooling element and the second liquid inlet of the second liquid cooling element, and the outer surfaces of the connecting parts being provided with locking grooves;

[0027] The connecting portion is embedded in the connecting channel, and the locking portion is arranged in the locking groove to lock the connecting head and the connecting portion.

[0028] In addition to one or more of the features disclosed above, or as an alternative, the connector further comprises: a self-locking portion protruding from the inner wall of the connecting channel, and the self-locking portion abuts against the connecting portion.

[0029] On the other hand, an electrical device is further disclosed. In addition to or instead of one or more of the features disclosed above, the electrical device includes a battery pack as described in any one of the above items, and the battery pack serves as a power supply for the electrical device.

[0030] One of the above technical solutions has the following advantages or beneficial effects: the present application realizes a thermal connection between the pole and the first liquid cooling part through an electrical connector to form a heat dissipation structure of the pole-electrical connector-first liquid cooling part, ensuring that the pole can be fully utilized for heat dissipation when the single cell is working normally. At the same time, a thermal connection is realized between the first liquid cooling part and the first outer wall surface of the single cell through a thermal conductive part to form a heat dissipation structure of the first outer wall surface-thermal conductive part-electrical connector-first liquid cooling part, ensuring that the heat dissipation of the first outer wall surface is achieved by the thermal conductive part when the single cell is working normally, thereby optimizing the heat dissipation structure of the single cell in the battery pack, improving the heat dissipation performance of the battery pack, and ultimately improving the safety performance of the battery pack.

[0031] The present application also arranges a temperature equalizing plate between the first liquid cooling element and the electrical connector so that the heat generated by the single cell during normal operation is evenly conducted between the first liquid cooling element, the electrical connector and the heat conducting element, thereby achieving uniform cooling of the pole and the first outer wall surface of the single cell by the first liquid cooling element, thereby optimizing the liquid cooling effect of the first liquid cooling element and improving 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.

[0032] The present application also ensures that the liquid cooling unit has consistent liquid cooling and heat dissipation effect on each single battery cell by locating the first liquid inlet and the second liquid outlet on the same side in the third direction, and the first liquid outlet and the second liquid inlet on the same side in the third 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.

[0033] The present application utilizes a connecting head to realize quick disassembly and assembly between the first connecting tube and the first liquid cooling component and the second liquid cooling component, and utilizes a connecting head to realize quick disassembly and assembly between the second connecting tube and two adjacent second liquid cooling components, thereby facilitating the overall connection and assembly of the liquid cooling unit, improving the assembly efficiency of the liquid cooling unit, and thereby improving the assembly efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0035] Figure 1 is an exploded structural view of a battery pack provided according to an embodiment of the present application;

[0036] Figure 2 is a three-dimensional structural diagram of a single battery, a first liquid cooling element, and a second liquid cooling element provided according to an embodiment of the present application;

[0037] Figure 3 is a cross-sectional view of a single battery, a first liquid cooling element, and a second liquid cooling element along the AA direction according to an embodiment of the present application;

[0038] Figure 4 yes Figure 3 A partial enlarged view of point E in the middle;

[0039] Figure 5 is a partial cross-sectional view of a single battery, a first liquid cooling element, and a second liquid cooling element along the BB direction according to an embodiment of the present application;

[0040] Figure 6 is a three-dimensional structural view of a single cell provided according to an embodiment of the present application;

[0041] Figure 7 is a three-dimensional structural view of a liquid cooling unit provided according to an embodiment of the present application;

[0042] Figure 8 is a three-dimensional structural view from another perspective of a liquid cooling unit provided in an embodiment of the present application;

[0043] Figure 9 3D structural diagram of the second liquid cooling element, the second connecting pipe and the connector according to an embodiment of the present application;

[0044] Figure 10 is a partial cross-sectional view of the second liquid cooling element, the second connecting pipe, and the connector along the CC direction according to an embodiment of the present application;

[0045] Figure 11 is a partial exploded cross-sectional view of the second liquid cooling element, the second connecting pipe, and the connector along the DD direction according to an embodiment of the present application;

[0046] Figure 12 This is a three-dimensional structural view of the second connecting pipe and the connector provided according to an embodiment of the present application;

[0047] Figure 13 is a cross-sectional view of a first liquid cooling element provided according to an embodiment of the present application;

[0048] Figure 14 is a three-dimensional structural view of a second liquid cooling element provided according to an embodiment of the present application;

[0049] Figure 15 is a cross-sectional view of a second liquid cooling element provided according to an embodiment of the present application.

[0050] Description of reference numerals:

[0051] 100. Battery pack;

[0052] 110. Box body; 111. Accommodation cavity;

[0053] 120, single cell; 121, battery body; 122, terminal; 1211, first outer wall; 1212, second outer wall; 1213, third outer wall;

[0054] 130. Box cover;

[0055] 140. Liquid cooling unit; 141. First liquid cooling element; 1411. First liquid cooling channel; 1412. First liquid inlet; 1413. First liquid outlet; 142. Second liquid cooling element; 1421. Second liquid cooling channel; 1422. Second liquid inlet; 1423. Second liquid outlet; 143. First connecting pipe; 144. Second connecting pipe; 145. Connector; 1451. Connecting body; 1452. Connecting channel; 1453. Locking portion; 1454. Self-locking portion; 1455. Driving portion; 146. Connecting portion; 1461. Locking groove; 147. Main liquid inlet; 148. Main liquid outlet

[0056] 151. Electrical connector; 152. Heat conducting element;

[0057] 160, first thermal conductive adhesive layer;

[0058] 170, temperature plate;

[0059] 180, second thermal conductive adhesive layer;

[0060] 190. Rubber stopper. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and beneficial effects of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for the purpose of explaining this application and are not intended to limit this application.

[0062] 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0063] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0064] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being 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 the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0065] With the rapid development of the new energy industry, the demand for fast charging and discharging, as well as high-rate charging and discharging, of secondary batteries is increasing, and the heat dissipation requirements of secondary batteries are becoming increasingly stringent. Existing liquid cooling systems in battery packs have poor heat dissipation performance and cannot meet the cooling requirements of secondary batteries at high charge and discharge rates. Furthermore, existing liquid cooling systems in battery packs cool only the outer wall of the secondary battery, further failing to meet the high-rate charging and discharging cooling requirements of secondary batteries.

[0066] In view of this, in the embodiments of this application, reference is made to Figures 1 to 15 , the present application provides a battery pack 100, which is used to solve the above-mentioned problems.

[0067] The battery pack 100 has a first direction Z, a second direction Y, and a third direction X that intersect each other. For example, the battery pack 100 has the first direction Z, the second direction Y, and the third direction X that are perpendicular to each other. "Perpendicular" refers to a state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°.

[0068] Specifically, the battery pack 100 includes a box body 110 , single cells 120 , a box cover 130 , a liquid cooling unit 140 , an electrical connector 151 , and a heat conductor 152 .

[0069] Specifically, the box body 110 is provided with a accommodating cavity 111; the box cover 130 is provided on one side of the box body 110 in the first direction Z to seal the accommodating cavity 111; a plurality of single cells 120 are provided, and the plurality of single cells 120 are all provided in the accommodating cavity 111. For example, 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 second direction X. Specifically, the single cell 120 includes: a battery body 121 and a pole 122, the battery body 121 has a first outer wall surface 1211 provided near the box cover 130, and the pole 122 is provided on the first outer wall surface 1211; the electrical connector 151 is electrically connected to the pole 122 of the single cell 120 to connect two adjacent single cells 120, or to electrically connect the single cell 120 with other electrical components; the heat conductor 152 is provided on the electrical connector 151 at the first The liquid cooling unit 140 is located on a side close to the first outer wall 1211 in the direction Z, and the heat conductive member 152 is arranged opposite to the first outer wall 1211. The heat conductive member 152 is thermally connected to the electrical connector 151 and the first outer wall 1211 respectively. The liquid cooling unit 140 includes: a first liquid cooling member 141, which is arranged on a side of the electrical connector 151 away from the pole 122, and the first liquid cooling member 141 is thermally connected to the electrical connector 151 to achieve liquid cooling and heat dissipation of the single battery 120.

[0070] The battery pack 100 may comprise three layers: cells 120, battery modules, and battery packs. Specifically, the cells 120 are grouped into battery modules, which are then placed within the housing 110 to form the battery pack. Alternatively, the battery pack 100 may comprise two layers: cells 120 and battery packs. Specifically, the cells 120 are placed within the housing 110 to form the battery pack. This is not a specific limitation in this application and may be configured based on actual circumstances, as long as it does not affect the effectiveness of this application.

[0071] The single cell 120 may be a secondary battery, which refers to a single cell that can be recharged to activate the active material after discharge and continue to be used. For example, 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.

[0072] The single battery 120 may be a cylindrical battery, a prismatic battery, a soft-pack battery, or a battery of other shapes.

[0073] The battery body 121 may include a shell, an electrode assembly, an electrolyte, an end cap and other functional components. The electrolyte may be a conventional electrolyte or a special electrolyte with additives added, and the electrolyte is used to soak the electrode assembly. Among them, the electrode assembly is the component where the electrochemical reaction occurs in the single cell 120, and there may be one or more electrode assemblies. The electrode assembly is mainly formed by stacking or winding a positive electrode sheet, a separator 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 tab. 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 tab is electrically connected to the pole 122 to form a current loop, so that the single cell 120 can be used normally.

[0074] Among them, the above-mentioned pole 122 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.

[0075] The pole 122 can be made of conductive metal or other materials, but is not limited thereto. For example, the pole 122 can be made of metal copper or aluminum, but is not limited thereto.

[0076] Among them, the electrical connector 151 and the heat conductor 152 can be integrally formed, that is, the electrical connector 151 and the heat conductor 152 are an integral structure. For example, the electrical connector 151 and the heat conductor 152 are integrally die-cast, but not limited to this; the electrical connector 151 and the heat conductor 152 can also be separated. When the electrical connector 151 and the heat conductor 152 are separated, the electrical connector 151 and the heat conductor 152 are fixedly connected. For example, the electrical connector 151 is fixedly connected to the heat conductor 152 by welding or other processes. This is not specifically limited in this application and can be specifically set according to actual circumstances. For example, refer to Figure 5 In the present application, the electrical connector 151 and the heat conducting member 152 are integrally formed to facilitate the processing and forming of the electrical connector 151 and the heat conducting member 152 , thereby improving the overall assembly efficiency of the battery pack 100 .

[0077] The electrical connector 151 may be made of, but not limited to, conductive metal or other materials. For example, the electrical connector 151 may be made of, but not limited to, copper or aluminum.

[0078] The heat conducting member 152 may be made of a heat conducting material. For example, the heat conducting member 152 may be made of metal copper or aluminum, but is not limited thereto.

[0079] 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.

[0080] The first liquid cooling element 141 can be formed by forming aluminum material using an aluminum extrusion process.

[0081] As can be understood, the present application realizes a thermal connection between the pole 122 and the first liquid-cooling member 141 through the electrical connector 151 to form a heat dissipation structure of the pole 122-electrical connector 151-first liquid-cooling member 141, ensuring that the pole 122 can be fully utilized for heat dissipation when the single battery 120 is working normally. At the same time, a thermal connection is realized between the first liquid-cooling member 141 and the first outer wall 1211 of the single battery 120 through the thermal conductive member 152 to form a heat dissipation structure of the first outer wall 1211-thermal conductive member 152-electrical connector 151-first liquid-cooling member 141, ensuring that the heat dissipation structure of the single battery 120 in the battery pack 100 is optimized, the heat dissipation performance of the battery pack 100 is improved, and ultimately the safety performance of the battery pack 100 is improved.

[0082] In one embodiment, in order to optimize the heat conduction effect between the heat conducting member 152 and the first outer wall surface 1211, in this application, reference is made to Figures 3 and 4 The battery pack 100 further includes: a first thermally conductive adhesive layer 160, which is disposed between the thermally conductive member 152 and the first outer wall 1211, and the first thermally conductive adhesive layer 160 is thermally connected to the thermally conductive member 152 and the first outer wall 1211 respectively.

[0083] The present application provides a first thermally conductive adhesive layer 160 between the thermally conductive element 152 and the first outer wall surface 1211 to ensure that when the single battery 120 is working normally, the first thermally conductive adhesive layer 160 is used to strengthen the heat transfer between the thermally conductive element 152 and the first outer wall surface 1211, thereby improving the heat conduction efficiency between the thermally conductive element 152 and the first outer wall surface 1211, ensuring that the first liquid cooling element 141 can effectively dissipate heat from the first outer wall surface 1211, improving the liquid cooling heat dissipation effect at the first outer wall surface 1211, and thereby improving the overall heat dissipation effect of the single battery 120.

[0084] The first thermal conductive adhesive layer 160 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.

[0085] In one embodiment, in order to optimize the heat conduction effect between the first liquid cooling element 141 and the electrical connector 151 and the heat conducting element 152, in this application, reference is made to Figures 3 and 4 The battery pack 100 further includes: a temperature averaging plate 170 and a second thermal conductive adhesive layer 180 .

[0086] Specifically, the temperature averaging plate 170 is disposed between the first liquid cooling member 141 and the electrical connector 151 , and the temperature averaging plate 170 is thermally connected to the electrical connector 151 and the first liquid cooling member 141 respectively; the second thermal conductive adhesive layer 180 is disposed between the temperature averaging plate 170 and the electrical connector 151 .

[0087] 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.

[0088] In the present application, a temperature equalizing plate 170 is provided between the first liquid cooling element 141 and the electrical connector 151 so that the heat generated by the single cell 120 during normal operation is evenly conducted between the first liquid cooling element 141, the electrical connector 151, and the heat conducting element 152, thereby achieving uniform cooling of the pole 122 and the first outer wall 1211 of the single cell 120 by the first liquid cooling element 141, thereby optimizing the liquid cooling effect of the first liquid cooling element 141 and improving the heat dissipation performance of the battery pack 100; at the same time, the temperature equalizing plate 170 is used to overcome the assembly tolerance problem at the pole 122 of the single cell 120, ensuring the flatness of the battery pack 100 on the side of the pole 122 of the single cell 120, and facilitating the overall assembly of the battery pack 100.

[0089] At the same time, the present application sets a second thermally conductive adhesive layer 180 between the temperature averaging plate 170 and the electrical connector 151 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 temperature averaging plate 170 and the electrical connector 151, thereby improving the heat conduction efficiency between the temperature averaging plate 170 and the electrical connector 151, so as to ensure that the first liquid cooling part 141 can better perform liquid cooling and heat dissipation on the single cell 120, thereby improving the heat dissipation effect of the single cell 120.

[0090] In one embodiment, referring to Figures 3 and 4 The second thermally conductive adhesive layer 180 is provided with adhesive blocking parts 190 on both sides of the third direction Y to prevent the thermally conductive adhesive at the second thermally conductive adhesive layer 180 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.

[0091] Illustratively, the rubber blocking member 190 may be rubber blocking foam, but is not limited thereto.

[0092] In one embodiment, referring to Figure 2 and Figure 6 The battery body 121 also has two second outer walls 1212 arranged opposite to each other in the third direction X, and two third outer walls 1213 arranged opposite to each other in the second direction Y. The first outer wall 1211, the second outer wall 1212 and the third outer wall 1213 are connected in pairs.

[0093] Specifically, the liquid cooling unit 140 also includes: a second liquid cooling component 142, the second liquid cooling component 142 covers at least a portion of the third outer wall surface 1213, that is, the second liquid cooling component 142 can cover the entire area of the third outer wall surface 1213 to perform liquid cooling and heat dissipation on the third outer wall surface 1213; the second liquid cooling component 142 can also only cover a portion of the third outer wall surface 1213 to perform liquid cooling and heat dissipation on the third outer wall surface 1213. This is not specifically limited in this application and can be selected according to actual circumstances.

[0094] Illustratively, in the present application, the second liquid-cooling element 142 covers a portion of the third outer wall surface 1213 .

[0095] In the present application, the second liquid cooling element 142 covers at least a portion of the third outer wall surface 1213 , so that the second liquid cooling element 142 is used to liquid-cool the third outer wall surface 1213 of the single battery cell 120 . This allows the first liquid cooling element 141 and the second liquid cooling element 142 to liquid-cool different outer wall surfaces of the single battery cell 120 , respectively. This improves the liquid cooling efficiency of the single battery 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 .

[0096] The second liquid cooling element 142 is made of a heat-conducting material. For example, the second liquid cooling element 142 can be made of any one of copper, aluminum or stainless steel, but is not limited thereto.

[0097] The second liquid cooling element 142 can be formed from aluminum material using an aluminum extrusion process.

[0098] A thermally conductive adhesive layer may be provided between the second liquid cooling element 142 and the third outer wall 1213 to improve the heat conduction efficiency between the second liquid cooling element 142 and the third outer wall 1213 , thereby ensuring that the first liquid cooling element 141 can effectively cool the single battery 120 .

[0099] In another embodiment, the second liquid cooling element 142 may further cover the second outer wall 1212 to liquid-cool the second outer wall 1212 of the battery cell 120 .

[0100] In one embodiment, referring to Figures 8 to 15 A first liquid-cooling channel 1411 is defined in the first liquid-cooling element 141 for circulating a coolant. The first liquid-cooling channel 1411 extends along the third direction X. A first liquid inlet 1412 and a first liquid outlet 1413 are defined on the first liquid-cooling element 141. The first liquid inlet 1412 and the first liquid outlet 1413 are respectively disposed at opposite ends of the first liquid-cooling element 141 in the third direction X, and both the first liquid inlet 1412 and the first liquid outlet 1413 are connected to the first liquid-cooling channel 1411.

[0101] A second liquid-cooling channel 1421 is defined in the second liquid-cooling element 142 for circulating cooling liquid. The second liquid-cooling channel 1421 extends along the third direction X. A second liquid inlet 1422 and a second liquid outlet 1423 are defined on the second liquid-cooling element 142. The second liquid inlet 1422 and the second liquid outlet 1423 are respectively disposed at opposite ends of the second liquid-cooling element 142 in the third direction X, and both the second liquid inlet 1422 and the second liquid outlet 1423 are connected to the second liquid-cooling channel 1421.

[0102] Specifically, the first liquid inlet 1412 and the second liquid outlet 1423 are located on the same side in the third direction X, the first liquid outlet 1413 and the second liquid inlet 1422 are located on the same side in the third direction X, and the first liquid outlet 1413 is connected to the second liquid inlet 1422.

[0103] It can be understood that the coolant enters the first liquid cooling channel 1411 through the first liquid inlet 1412 , and the coolant from the first liquid cooling channel 1411 enters the second liquid cooling channel 1421 through the first liquid outlet 1413 and the second liquid inlet 1422 , and is discharged through the second liquid outlet 1423 .

[0104] The coolant has the lowest temperature when it is delivered to the first liquid inlet 1412. When the coolant flows to the first liquid outlet 1413 and the second liquid inlet 1422, the coolant temperature increases due to heat exchange with the single battery 120 in the first liquid-cooling channel 1411. When the coolant flows to the second liquid outlet 1423, the coolant temperature increases again due to heat exchange with the single battery 120 in the second liquid-cooling channel 1421.

[0105] The present application ensures that the liquid cooling unit 140 has a consistent liquid cooling and heat dissipation effect 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.

[0106] In one embodiment, referring to Figures 7 and 8Multiple first liquid cooling elements 141 and multiple second liquid cooling elements 142 are provided, and the multiple first liquid cooling elements 141 and the multiple second liquid cooling elements 142 are arranged at intervals in the second direction Y. In this application, by providing multiple first liquid cooling elements 141 and multiple second liquid cooling elements 142, the multiple first liquid cooling elements 141 and the multiple second liquid cooling elements 142 are used to jointly cool the single battery cells 120, thereby improving the cooling effect of the liquid cooling unit 140 and further improving the heat dissipation performance of the battery pack 100.

[0107] Specifically, the liquid cooling unit 140 further includes a first connecting pipe 143 and a second connecting pipe 144. The first connecting pipe 143 is connected to the first liquid outlet 1413 of the first liquid cooling element 141 and the second liquid inlet 1422 of the second liquid cooling element 142, respectively. The second connecting pipe 144 is connected to the second liquid inlets 1422 of two adjacent second liquid cooling elements 142, respectively. In this application, the first connecting pipe 143 enables communication between the first and second liquid cooling channels 1411 and 1421, and the second connecting pipe 144 enables communication between two adjacent second liquid cooling channels 1421. While ensuring the flow of coolant, this simple structure allows for communication between the liquid cooling channels, facilitating overall assembly of the battery pack and reducing production costs. Furthermore, the small footprint of the first and second connecting pipes 143 and 144 reduces the overall footprint of the liquid cooling unit 140, thereby optimizing the overall layout of the battery pack 100 and making it more compact.

[0108] In another embodiment, the liquid cooling unit 140 may further be provided with a three-way pipe to achieve communication between the first liquid cooling element 141 and the plurality of second liquid cooling elements 142 .

[0109] In one embodiment, in order to realize the rapid disassembly and assembly between components, in this application, reference is made to Figures 8 to 12 The liquid cooling unit 140 further includes: a plurality of connectors 145, which are respectively arranged at the end of the first connecting tube 143 and the end of the second connecting tube 144, and the connectors 145 are detachably connected to the first liquid-cooling member 141 and the second liquid-cooling member 142, respectively, so as to utilize the connectors 145 to realize quick disassembly and assembly between the first connecting tube 143 and the first liquid-cooling member 141 and the second liquid-cooling member 142, and to realize quick disassembly and assembly between the second connecting tube 144 and two adjacent second liquid-cooling members 142, thereby facilitating the overall connection and assembly of the liquid cooling unit 140, improving the assembly efficiency of the liquid cooling unit 140, and thereby improving the assembly efficiency of the battery pack 100.

[0110] In one embodiment, referring to Figures 10 to 12 The connecting head 145 includes a connecting body 1451 and a locking portion 1453 .

[0111] The connecting body 1451 is arranged on either the first connecting tube 143 or the second connecting tube 144 , that is, the connecting body 1451 can be arranged on the first connecting tube 143 , and the connecting body 1451 can also be arranged on the second connecting tube 144 ; a connecting channel 1452 is opened in the connecting body 1451 ; the locking portion 1453 is movably arranged on the connecting body 1451 .

[0112] The liquid cooling unit 140 further includes a plurality of connecting portions 146 , which are respectively disposed at the first liquid outlet 1413 of the first liquid cooling element 141 and the second liquid inlet 1422 of the second liquid cooling element 142 . Locking grooves 1461 are defined on outer surfaces of the connecting portions 146 .

[0113] Specifically, the connecting portion 146 is embedded in the connecting channel 1452, and the locking portion 1453 is disposed in the locking groove 1461 to lock the connecting head 145 with the connecting portion 146. The connecting head 145 further includes a driving portion 1455, which is connected to the locking portion 1453 and partially disposed outside the connecting body 1451. The driving portion 1455 is used to drive the locking portion 1453 to move.

[0114] Specifically, the connection head 145 and the connection portion 146 have two states: locked and unlocked. When the first liquid cooling member 141, the second liquid cooling member 142, the first connecting pipe 143 and the second connecting pipe 144 need to be assembled into an integral structure, the staff first embeds the connection portion 146 in the connection channel 1452 of the connection head 145 to achieve the preliminary assembly between the connection portion 146 and the connection head 145. Secondly, the staff drives the locking portion 1453 toward the direction close to the locking groove 1461 through the driving portion 1455 to drive the locking portion 1453 to move toward the locking groove 1461. 1453 is located in the locking groove 1461 of the connecting part 146, and the connecting head 145 and the connecting part 146 are in a locked state, so that the locking between the connecting head 145 and the connecting part 146 is achieved through the cooperation between the locking part 1453 and the locking groove 1461, so that the connection between the first liquid cooling part 141 and the first connecting tube 143, between the second liquid cooling part 142 and the first connecting tube 143, and between the second liquid cooling part 142 and the second connecting tube 144 is fixed, ensuring the normal use of the liquid cooling unit 140 and facilitating the subsequent normal assembly of the battery pack 100.

[0115] When it is necessary to disassemble and separate the first liquid cooling member 141 and the first connecting pipe 143, the second liquid cooling member 142 and the first connecting pipe 143, and the second liquid cooling member 142 and the second connecting pipe 144, the staff first drives the locking portion 1453 to move away from the locking groove 1461 through the driving portion 1455, so as to drive the locking portion 1453 to move to the outside of the locking groove 1461 of the connecting portion 146, and the locking portion 1453 and the locking groove 1461 are in a separated state, that is, the connecting head 145 and the connecting portion 146 are separated. The two are in an unlocked state to achieve unlocking between the connecting head 145 and the connecting part 146. Secondly, the staff moves the connecting part 146 to the outside of the connecting channel 1452 of the connecting head 145 to separate the connecting part 146 from the connecting head 145, thereby achieving rapid disassembly between the first liquid cooling part 141 and the first connecting pipe 143, between the second liquid cooling part 142 and the first connecting pipe 143, and between the second liquid cooling part 142 and the second connecting pipe 144, which is convenient for subsequent maintenance and replacement of parts in the liquid cooling unit 140.

[0116] In one embodiment, referring to Figures 10 to 12 Connector 145 further includes a self-locking portion 1454 protruding from the inner wall of connecting channel 1452 and abutting against connecting portion 146. The present application provides self-locking portion 1454 to further securely connect connector 145 to connecting portion 146, thereby ensuring the normal operation of liquid cooling unit 140.

[0117] The self-locking portion 1454 and the connecting body 1451 can be integrally formed, that is, the self-locking portion 1454 and the connecting body 1451 are a one-piece structure; the self-locking portion 1454 and the connecting body 1451 can also be provided separately and fixedly connected thereto, for example, the self-locking portion 1454 is fixedly connected to the connecting body 1451 by a process such as welding. This is not specifically limited in this application and can be specifically configured according to actual circumstances. For example, in this application, the self-locking portion 1454 and the connecting body 1451 are integrally formed to facilitate the processing and molding of the connector 145.

[0118] In one embodiment, referring to Figure 7 The liquid cooling unit 140 further includes: a main liquid inlet pipe 147 and a main liquid outlet pipe 148 , the main liquid inlet pipe 147 is connected to the first liquid inlet 1412 of the first liquid cooling element 141 , and the main liquid outlet pipe 148 is connected to the second liquid outlet 1423 of the second liquid cooling element 142 .

[0119] Among them, the main liquid inlet pipe 147 and the main liquid outlet pipe 148 are both connected to the liquid storage device outside the battery pack 100, and the liquid storage device is used to provide cooling liquid.

[0120] Specifically, the coolant in the liquid storage device is transported to the main liquid inlet pipe 147, and the coolant from the main liquid inlet pipe 147 enters the first liquid cooling channel 1411 through the first liquid inlet 1412, so as to circulate in the first liquid cooling channel 1411 for liquid cooling and heat dissipation, and the coolant from the first liquid cooling channel 1411 enters the second liquid cooling channel 1421 through the first liquid outlet 1413 and the second liquid inlet 1422, so as to circulate in the second liquid cooling channel 1421 for liquid cooling and heat dissipation, and is then discharged to the main liquid outlet pipe 148 through the second liquid outlet 1423. The coolant from the main liquid outlet pipe 148 is then discharged to the liquid storage device to form a liquid cooling cycle.

[0121] The present application provides a main liquid inlet pipe 147 and a main liquid outlet pipe 148 to achieve synchronous control of multiple first liquid cooling elements 141 and second liquid cooling elements 142, thereby improving the cooling control efficiency of the liquid cooling unit 140. In another embodiment, the present application also provides an electrical device including a battery pack 100 as described in any of the above embodiments, wherein the battery pack 100 serves as a power supply for the electrical device.

[0122] Among them, electrical devices can be 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.

[0123] The above steps are merely provided to help understand the method, structure, and core concept of the present application. A person skilled in the art may make several improvements and modifications to the present application without departing from the principles of the present application, and such 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 intersecting direction, characterized in that: include: The box body is provided with a receiving cavity; a box cover, arranged on one side of the box body in the first direction; A plurality of single cells are arranged in the accommodating cavity, and the single cells include: a battery body and a pole, the battery body has a first outer wall surface arranged close to the box cover, and the pole is arranged on the first outer wall surface; an electrical connector electrically connected to the electrode of the single battery; a heat conducting member disposed on a side of the electrical connector close to the first outer wall in the first direction, the heat conducting member being disposed opposite to the first outer wall, and the heat conducting member being thermally connected to the electrical connector and the first outer wall respectively; and The liquid cooling unit includes: a first liquid cooling element, which is arranged on a side of the electrical connector away from the pole, and the first liquid cooling element is thermally connected to the electrical connector.

2. The battery pack according to claim 1, wherein: Also includes: The first thermally conductive adhesive layer is disposed between the thermally conductive component and the first outer wall surface, and the first thermally conductive adhesive layer is thermally connected to the thermally conductive component and the first outer wall surface respectively.

3. The battery pack according to claim 1, wherein: Also includes: a temperature averaging plate, disposed between the first liquid-cooling element and the electrical connector, and the temperature averaging plate being thermally connected to the electrical connector and the first liquid-cooling element respectively; as well as A second thermally conductive adhesive layer is provided between the temperature homogenizing plate and the electrical connector.

4. The battery pack according to claim 1, wherein: The electrical connector and the heat conducting member are integrally formed.

5. The battery pack according to any one of claims 1 to 4, wherein: The battery pack further has a second direction and a third direction intersecting the first direction in pairs; The battery body further comprises two second outer walls arranged opposite to each other in the third direction, and two third outer walls arranged opposite to each other in the second direction, wherein the first outer walls, the second outer walls and the third outer walls are connected in pairs; The liquid cooling unit further includes a second liquid cooling element, wherein the second liquid cooling element covers at least a portion of the third outer wall surface.

6. The battery pack according to claim 5, wherein: A first liquid cooling channel is defined in the first liquid cooling element, the first liquid cooling channel extending along the third direction, a first liquid inlet and a first liquid outlet are defined on the first liquid cooling element, the first liquid inlet and the first liquid outlet are respectively disposed at opposite ends of the first liquid cooling element in the third direction, and both the first liquid inlet and the first liquid outlet are in communication with the first liquid cooling channel; A second liquid-cooling channel is defined in the second liquid-cooling element, the second liquid-cooling channel extending along the third direction, a second liquid inlet and a second liquid outlet are defined on the second liquid-cooling element, the second liquid inlet and the second liquid outlet are respectively disposed at opposite ends of the second liquid-cooling element in the third direction, and the second liquid inlet and the second liquid outlet are both in communication with the second liquid-cooling channel; The first liquid inlet and the second liquid outlet are located on the same side in the third direction, the first liquid outlet and the second liquid inlet are located on the same side in the third direction, and the first liquid outlet is communicated with the second liquid inlet.

7. The battery pack according to claim 6, wherein: A plurality of the first liquid-cooling elements and a plurality of the second liquid-cooling elements 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 second direction; The liquid cooling unit further includes: a first connecting pipe and a second connecting pipe, the first connecting pipe being connected to the first liquid outlet of the first liquid cooling element and the second liquid inlet of the second liquid cooling element respectively, and the second connecting pipe being connected to the second liquid inlets of two adjacent second liquid cooling elements respectively.

8. The battery pack according to claim 7, wherein: The liquid cooling unit further includes: a plurality of connectors, which are respectively provided at the ends of the first connecting pipe and the second connecting pipe, and the connectors are respectively detachably connected to the first liquid cooling component and the second liquid cooling component.

9. The battery pack according to claim 8, wherein: The connector includes: a connecting body, which is arranged on any one of the first connecting pipe and the second connecting pipe, and a connecting channel is opened in the connecting body; and a locking portion, movably disposed on the connecting body; The liquid cooling unit further includes: a plurality of connecting parts, the plurality of connecting parts being respectively provided at the first liquid outlet of the first liquid cooling element and the second liquid inlet of the second liquid cooling element, and the outer surfaces of the connecting parts being provided with locking grooves; The connecting portion is embedded in the connecting channel, and the locking portion is disposed in the locking groove to lock the connecting head and the connecting portion.

10. The battery pack according to claim 9, wherein: The connector further comprises a self-locking portion protruding from the inner wall of the connecting channel, and the self-locking portion abuts against the connecting portion.

11. An electrical device, characterized in that: The battery pack comprises the battery pack according to any one of claims 1 to 10, wherein the battery pack serves as a power supply for the electrical device.

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