Battery pack and electric equipment

Abstract

The invention provides a battery pack and electric equipment. The battery pack comprises a battery module and a heat dissipation structure, the battery module comprises at least two battery cell components, and the at least two battery cell components are arranged along a first direction; the battery cell assembly comprises at least two battery cell units, and the at least two battery cell units are arranged along a second direction; in each battery cell assembly, a first heat dissipation structure is arranged between at least two adjacent battery cell units, and the first heat dissipation structure is provided with a first heat dissipation channel communicated with the outside; therefore, the heat dissipation performance and the safety of the battery pack are improved.

Description

[0001] This application is a divisional application of the patent application with application date of January 13, 2025, application number 2025100473408, and invention name “Battery Pack, Battery Pack System and Electrical Equipment”. Technical Field

[0002] The present invention relates to the technical field of batteries, and in particular to a battery pack and electrical equipment. Background Art

[0003] Battery packs have been widely used in electric vehicles, electric motorcycles, electric bicycles, drones and other electric equipment to provide power support for electric equipment.

[0004] A battery pack specifically consists of a housing and a battery module. The battery module, which contains multiple battery cells, is located within the housing. The battery pack generates heat during operation. If the temperature rise of the battery module is excessive and the heat cannot be dissipated in time, thermal runaway can occur in the battery pack, leading to accidents such as fire and explosion. Summary of the Invention

[0005] In view of this, embodiments of the present invention are directed to providing a battery pack and an electrical device to improve the heat dissipation performance and safety performance of the battery pack to a certain extent.

[0006] In a first aspect, the present invention provides a battery pack, comprising a battery module and a heat dissipation structure;

[0007] The battery module includes at least two battery cell assemblies, and the at least two battery cell assemblies are arranged along a first direction; the battery cell assembly includes at least two battery cell units, and at least two of the battery cell units are arranged along a second direction;

[0008] In each of the battery core assemblies, the first heat dissipation structure is provided between at least two adjacent battery core units, and the first heat dissipation structure has a first heat dissipation channel communicating with the outside world;

[0009] The second heat dissipation structure is arranged between two adjacent battery core assemblies, and the second heat dissipation structure has a second heat dissipation channel communicating with the outside; the first heat dissipation channel and the second heat dissipation channel are connected;

[0010] The second heat dissipation structure includes two brackets, which are arranged along the first direction and spliced ​​together. The brackets correspond to the battery cell assemblies one by one, and each bracket is respectively connected to the first heat dissipation structure in the corresponding battery cell assembly; the two brackets jointly define the second heat dissipation channel.

[0011] Optionally, a ventilation hole is provided on the bracket;

[0012] One end of the first heat dissipation channel is in communication with the outside, the other end of the first heat dissipation channel is in communication with the vent, and the vent is in communication with the second heat dissipation channel.

[0013] Optionally, the battery pack further includes a circuit board, and the circuit board is located on one side of the battery module along the third direction;

[0014] A glue potting cavity with an opening facing the circuit board is provided on one side of the bracket facing the circuit board, and a glue potting hole communicating with the glue potting cavity is provided on the bracket.

[0015] Optionally, the bracket includes a main body and a first splicing portion; the first splicing portion is provided on one side of the main body along the first direction;

[0016] The first splicing portion includes an inclined wall and an end wall, one end of the inclined wall is connected to the main body, the other end of the inclined wall extends obliquely away from the main body, and the end wall is connected between the other end of the inclined wall and the main body;

[0017] The inclined wall, the end wall and the main body together define the glue pouring cavity, and the glue pouring hole is provided on the end wall;

[0018] The inclined walls of the two brackets are in contact with each other, and along the second direction, the end walls of the two brackets are arranged opposite to each other.

[0019] Optionally, the bracket includes a main body and a first splicing portion; the first splicing portion is provided on one side of the main body along the first direction;

[0020] The first splicing portion includes an inclined wall and an end wall, one end of the inclined wall is connected to the main body, the other end of the inclined wall extends obliquely away from the main body, and the end wall is connected between the other end of the inclined wall and the main body;

[0021] The inclined walls of the two brackets are arranged in contact with each other, and along the second direction, the end walls of the two brackets are arranged opposite to each other.

[0022] Optionally, the main body is connected to the first heat dissipation structure;

[0023] And / or, a vent is provided on the main body, one end of the first heat dissipation channel is connected to the outside, the other end of the first heat dissipation channel is connected to the vent, and the vent is connected to the second heat dissipation channel;

[0024] And / or, the main body is a plate-shaped structure.

[0025] Optionally, the bracket includes two first splicing portions, and the two first splicing portions are arranged at two ends of the main body along the third direction;

[0026] The projections of the inclined walls of the two first joint portions along the third direction intersect.

[0027] Optionally, the bracket also includes a second splicing portion, the second splicing portion and the first splicing portion are arranged on the same side of the main body along the first direction, and along the third direction, the second splicing portion is located between the two first splicing portions; the second splicing portions of the two brackets are arranged in close contact with each other.

[0028] Optionally, the bracket is provided with a first clamping portion and a second clamping portion, and the first clamping portion and the second clamping portion are arranged at intervals on the bracket;

[0029] The first engaging portion on one of the brackets corresponds to and is matched with the second engaging portion on the other bracket.

[0030] Optionally, one of the first engaging portion and the second engaging portion is a buckle, and the other of the first engaging portion and the second engaging portion is a hole that matches and engages with the buckle;

[0031] And / or, the bracket is provided with an extension arm extending in a direction away from the corresponding battery cell assembly and a positioning groove for the extension arm to be snapped into; the extension arm on one of the brackets is matched and connected with the positioning groove on the other bracket, the first snap-fitting portion is provided on the extension arm, and the second snap-fitting portion is provided in the positioning groove;

[0032] And / or, there are at least two first engaging portions and at least two second engaging portions;

[0033] And / or, the first engaging portion, the second engaging portion and the bracket are integrally formed.

[0034] Optionally, the first heat dissipation structure includes a hollow heat dissipation plate, which is located between two adjacent battery core units; the inner cavity of the heat dissipation plate forms at least a portion of the first heat dissipation channel.

[0035] Optionally, the heat dissipation plate is in thermal contact with the outer surface of the battery cell unit;

[0036] And / or, heat dissipation fins are provided in the inner cavity of the heat dissipation plate;

[0037] There are at least two heat dissipation fins, and at least two of the heat dissipation fins are arranged at intervals along the third direction;

[0038] And / or, the heat dissipation fins and the heat dissipation plate are integrally formed.

[0039] Optionally, the first heat dissipation structure further includes two end plates, which are respectively arranged at two ends of the heat dissipation plate along the first direction, and the two end plates are located on the outside of the battery cell unit along the first direction;

[0040] A through hole is formed on the end plate, and the end of the heat dissipation plate is passed through the through hole.

[0041] Optionally, the battery cell unit includes a battery cell shell and an electrode assembly located in the battery cell shell, and side seals are respectively provided on both sides of the battery cell shell along the first direction;

[0042] There is a distance between the end plate and the corresponding side edge seal along the first direction, and the distance is not less than 1.5 mm;

[0043] And / or, a first waterproof member is provided between the end plate of the heat dissipation plate member at one end close to the second heat dissipation structure and the second heat dissipation structure;

[0044] And / or, the battery pack includes a shell, the battery module, the first heat dissipation structure and the second heat dissipation structure are located in the shell, and a second waterproof component is provided between the end plate of the heat dissipation plate at one end away from the second heat dissipation structure and the shell.

[0045] Optionally, in each of the battery core assemblies, a second heat conducting member is provided between at least two adjacent battery core units, and the second heat conducting member is in thermal contact with the battery core units.

[0046] Optionally, the battery core assembly includes at least three battery core units, wherein the first heat dissipation structure is provided between two adjacent battery core units, and wherein the second heat conductive member is provided between another two adjacent battery core units;

[0047] And / or, at least two second heat conducting members are provided between two adjacent battery core units, and at least two second heat conducting members are arranged at intervals between two adjacent battery core units;

[0048] And / or, the second heat-conducting member is a heat-conducting foam, and the compression amount a of the heat-conducting foam satisfies: 20%≤a≤80%;

[0049] And / or, a thickness b of the second heat conducting member along the second direction satisfies: 0.7 mm ≤ b ≤ 2 mm.

[0050] Optionally, a first heat conducting member is provided on the outer surface of the outermost battery core unit along the second direction.

[0051] Optionally, the first heat-conducting member includes a heat-conducting foam provided on the outer surface of the battery cell unit and a graphite layer provided at least on a side of the heat-conducting foam facing away from the battery cell unit;

[0052] And / or, a projected area of ​​the first heat conducting member on the outermost battery core unit is not less than 1 / 2 of an area of ​​an outer surface of the battery core unit.

[0053] Optionally, the battery pack further includes a shell;

[0054] The battery module, the first heat dissipation structure and the second heat dissipation structure are located in the housing;

[0055] A first ventilation hole is provided at a position of the housing corresponding to the first heat dissipation channel, and a second ventilation hole is provided at a position of the housing corresponding to the second heat dissipation channel.

[0056] In a second aspect, the present invention provides an electrical device comprising the battery pack as described above, or comprising the battery pack system as described above.

[0057] The battery pack and electrical equipment provided by the present invention are such that the battery module of the battery pack includes at least two battery cell assemblies arranged along a first direction, the battery cell assembly includes at least two battery cell units arranged along a second direction, and a heat dissipation structure is provided between at least two adjacent battery cell units. Since the heat dissipation structure has a first heat dissipation channel connected to the outside world, at least the heat of the battery cell unit can be transferred to the external environment through the first heat dissipation channel; at the same time, the second heat dissipation structure is provided between two adjacent battery cell assemblies. Since the second heat dissipation structure has a second heat dissipation channel connected to the outside world, at least the heat between the battery cell units and adjacent battery cell assemblies can be transferred to the external environment through the second heat dissipation channel. Moreover, the first heat dissipation channel is connected to the second heat dissipation channel. In this way, the battery pack can dissipate heat in multiple directions through the two heat dissipation structures, so that the heat of the battery module can be dissipated in time, the temperature rise of the battery module is reduced, the heat dissipation effect of the battery pack is improved, and the occurrence of thermal runaway of the battery pack is avoided to a certain extent, thereby improving the safety of the battery pack.

[0058] Moreover, since the first heat dissipation channel and the second heat dissipation channel are connected, if one of the first heat dissipation channel and the second heat dissipation channel is accidentally blocked, the heat will be transferred to the external space of the battery pack through the other of the first heat dissipation channel and the second heat dissipation channel, thereby ensuring timely and effective heat dissipation of the battery module and further ensuring the heat dissipation effect.

[0059] At the same time, by making the second heat dissipation structure include two brackets, the two brackets are arranged along the first direction and spliced ​​together, so that the brackets correspond to the battery cell components one by one, and each bracket is respectively connected to the first heat dissipation structure in the corresponding battery cell component. The two brackets jointly define a second heat dissipation channel. This arrangement allows that during assembly, each bracket can be first connected to the first heat dissipation structure in the corresponding battery cell component, and then the two brackets can be spliced ​​together. This improves the convenience of battery pack assembly while achieving heat dissipation for the battery pack, and improves the overall stability of the first and second heat dissipation structures, providing further guarantees for good heat dissipation of the battery pack. In addition, during production, the two brackets can be made using a single mold, which is convenient to produce and saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 Schematic diagram of the structure of a battery pack according to an embodiment of the present invention.

[0061] Figure 2 This is an exploded structural diagram of a battery pack according to an embodiment of the present invention.

[0062] Figure 3 This is a structural schematic diagram of the battery pack shell body, first heat dissipation structure, second heat dissipation structure and battery module according to one embodiment of the present invention.

[0063] Figure 4 for Figure 3 Corresponding top view structural diagram.

[0064] Figure 5 for Figure 4 Enlarged view of the structure at position I.

[0065] Figure 6 for Figure 5 Enlarged view of the structure at point C in the middle.

[0066] Figure 7 for Figure 4 A magnified view of the structure at point A.

[0067] Figure 8 Schematic diagram of the battery module, the first heat dissipation structure and the second heat dissipation structure of the battery pack according to one embodiment of the present invention Figure 1 .

[0068] Figure 9 Schematic diagram of the first heat dissipation structure in a battery pack according to an embodiment of the present invention.

[0069] Figure 10 Schematic diagram of the battery module, the first heat dissipation structure and the second heat dissipation structure of the battery pack according to one embodiment of the present invention Figure 2 .

[0070] Figure 11 for Figure 10 Enlarged view of the structure at M in the middle.

[0071] Figure 12 Schematic diagram of the second heat dissipation structure in a battery pack according to an embodiment of the present invention.

[0072] Figure 13 Schematic diagram of the structure of a bracket in a battery pack according to an embodiment of the present invention.

[0073] Figure 14 This is a schematic diagram of the partial structure of two brackets in a battery pack according to an embodiment of the present invention when they are engaged together.

[0074] Among them, 1. battery module; 11. battery cell assembly; 111. battery cell unit; 112. battery cell shell; 113. side seal; 2. first heat dissipation structure; 20. first heat dissipation channel; 21. heat dissipation plate; 211. heat dissipation fin; 22. end plate; 221. through hole; 3. second heat dissipation structure; 30. second heat dissipation channel; 31. bracket; 310. vent; 311. main body; 312. first splicing part; 313. inclined wall; 314. end wall; 315. glue injection hole; 316 , glue filling cavity; 317, second splicing part; 32, first clamping part; 33, second clamping part; 34, extension arm; 35, positioning groove; 4, circuit board; 5, first waterproof part; 6, second waterproof part; 7, second heat-conducting part; 8, first heat-conducting part; 100, shell; 101, shell body; 102, upper cover; 103, first side panel; 104, second side panel; 105, third side panel; 106, fourth side panel; 107, bottom plate; 108, first ventilation hole; 109, second ventilation hole. DETAILED DESCRIPTION

[0075] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments derived by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0076] The battery pack includes a housing, a battery module, and a circuit board, which are housed within the housing. The battery module can include multiple cells, which can be arranged in a predetermined orientation. The circuit board is connected to the battery module and is used, for example, to monitor and manage the battery module's status, which can include information such as current, voltage, and temperature.

[0077] The battery pack generates heat when working. If the heat is not dissipated in time, the battery pack temperature will rise too high and thermal runaway will occur, which will lead to accidents such as fire and explosion.

[0078] Based on this, an embodiment of the present invention provides a battery pack and an electrical device, in which the battery module includes at least two battery cell assemblies, and the battery cell assembly includes at least two battery cell units. A first heat dissipation structure is provided between at least two adjacent battery cell units, and a second heat dissipation structure is provided between two adjacent battery cell assemblies, so that the heat dissipation channels of the first heat dissipation structure and the second heat dissipation structure are connected. Heat dissipation of the battery pack is achieved through the two heat dissipation structures, avoiding problems such as thermal runaway caused by excessive temperature rise of the battery pack, and improving the heat dissipation efficiency and safety of the battery pack.

[0079] The battery pack and the electrical equipment provided by the present invention are described in detail below with reference to specific embodiments in conjunction with the accompanying drawings:

[0080] Reference Figures 1 to 14 As shown, this embodiment provides a battery pack, which may include: a battery module 1, a circuit board 4, a first heat dissipation structure 2 and a second heat dissipation structure 3.

[0081] The battery module 1 includes at least two battery cell assemblies 11, which are arranged along a first direction. Each battery cell assembly 11 includes at least two battery cell units 111, which are arranged along a second direction.

[0082] The circuit board 4 may be located on one side of the battery module 1 along the third direction. The circuit board 4 is electrically connected to the battery module 1 , and can, for example, monitor and manage the current, voltage and other states of the battery module 1 .

[0083] Reference Figure 1 As shown, the first direction in this article is Figure 1 The X direction in the figure can be specifically the length direction of the battery pack. The second direction is, for example, Figure 1 The Y direction in the figure can be specifically the width direction of the battery pack. The third direction is, for example, Figure 1 The Z direction may specifically be the height direction of the battery pack.

[0084] The battery cell unit 111 may specifically include: a battery cell shell 112 and an electrode assembly located in the battery cell shell 112, wherein the electrode assembly may specifically include a positive electrode sheet, a negative electrode sheet and a separator, the positive electrode sheet, the separator and the negative electrode sheet are stacked in sequence, a positive electrode ear is provided on the positive electrode sheet, and a negative electrode ear is provided on the negative electrode sheet.

[0085] The cell housing 112 has a top seal on one side along the third direction. For example, the positive and negative tabs can both extend from the top seal and be connected to the circuit board 4. The cell housing 112 has side seals 113 on both sides along the first direction.

[0086] In each battery cell assembly 11 , a first heat dissipation structure 2 is provided between at least two adjacent battery cell units 111 , and the first heat dissipation structure 2 has a first heat dissipation channel 20 communicating with the outside.

[0087] The second heat dissipation structure 3 is disposed between two adjacent battery core assemblies 11 and has a second heat dissipation channel 30 communicating with the outside, wherein the first heat dissipation channel 20 and the second heat dissipation channel 30 are connected.

[0088] The outside world here can be understood as the external space of the battery pack. The first heat dissipation channel 20, the second heat dissipation channel 30 and the space outside the battery pack can form air convection and exchange heat with the external air. That is, the heat emitted by the battery cell unit 111, the battery cell assembly 11, the circuit board 4 and other components in the battery pack is dissipated to the external space of the battery pack through the first heat dissipation channel 20 and the second heat dissipation channel 30, thereby realizing heat dissipation of the battery pack, reducing the temperature rise of the battery pack, and improving the safety of the battery pack.

[0089] Take a battery cell assembly 11 including three battery cell units 111 arranged along the second direction, where the three battery cell units 111 are the first battery cell unit, the second battery cell unit and the third battery cell unit in sequence as an example for explanation: the first heat dissipation structure 2 can be set only between the first battery cell unit and the second battery cell unit, or only between the second battery cell unit and the third battery cell unit, or both between the first battery cell unit and the second battery cell unit and between the second battery cell unit and the third battery cell unit.

[0090] In a specific implementation, there can be two, three or more battery cell assemblies 11. Taking the battery module 1 including three battery cell assemblies 11, which are the first battery cell assembly, the second battery cell assembly and the third battery cell assembly in sequence as an example, the second heat dissipation structure 3 can be set only between the first battery cell assembly and the second battery cell assembly, or only between the second battery cell assembly and the third battery cell assembly, or both between the first battery cell assembly and the second battery cell assembly and between the second battery cell assembly and the third battery cell assembly as an example.

[0091] The first heat dissipation channel 20 and the second heat dissipation channel 30 are connected. Specifically, for example, at least a portion of the heat within the battery pack is directly transferred to the exterior of the battery pack through the first heat dissipation channel 20. For another example, at least a portion of the heat within the battery pack is directly transferred to the exterior of the battery pack through the second heat dissipation channel 30. For another example, the heat within the battery pack is transferred to the exterior of the battery pack through the first heat dissipation channel 20 and the second heat dissipation channel 30, thereby dissipating heat from the battery pack and improving the safety of the battery pack.

[0092] In a specific implementation, an air cooling device may be provided, which may be a device capable of driving air flow, such as a fan, wherein the air cooling device is provided corresponding to the first heat dissipation channel 20 and / or the air cooling device is provided corresponding to the second heat dissipation channel 30.

[0093] For example, the air cooling device can drive air outside the battery pack into the first heat dissipation channel 20, remove heat from the battery cell units 111, and then flow out of the battery pack through the first heat dissipation channel 20 or the second heat dissipation channel 30. For another example, the air cooling device can drive gas outside the battery pack into the second heat dissipation channel 30, remove heat from the battery pack, and then flow out of the battery pack through the other end of the second heat dissipation channel 30 or through the first heat dissipation channel 20.

[0094] The air cooling device can be in blowing mode or exhaust mode.

[0095] By providing an air cooling device, the convection between the first heat dissipation channel 20 and / or the second heat dissipation channel 30 and the external air can be further accelerated to quickly remove the heat in the battery pack, thereby achieving rapid heat dissipation of the battery pack.

[0096] Of course, in other implementations, water cooling can also be used to dissipate heat from the battery pack. That is, a coolant, such as cooling water, is passed through the first and second heat dissipation channels 20 and 30. The coolant exchanges heat with the battery cells 111 and other components, absorbing heat from the battery pack and dissipating heat from the battery pack. For example, to prevent leakage of the coolant, the first and second heat dissipation channels 20 and 30 can be connected only to the outside world.

[0097] In a specific implementation, the battery pack may include a housing 100 , which specifically includes a housing body 101 and an upper cover 102 covering the housing body 101 . The battery module 1 , the first heat dissipation structure 2 , the second heat dissipation structure 3 , and the circuit board 4 are located within the housing 100 .

[0098] Reference Figure 1 and Figure 2 As shown, the shell body 101 may specifically include: a first side plate 103 , a second side plate 104 , a third side plate 105 , a fourth side plate 106 and a bottom plate 107 .

[0099] The first side plate 103 and the second side plate 104 are arranged opposite each other along the second direction, the third side plate 105 and the fourth side plate 106 are arranged opposite each other along the first direction, the third side plate 105 is connected to the first side plate 103 and the second side plate 104 respectively, the fourth side plate 106 is connected to the first side plate 103 and the second side plate 104 respectively, and the bottom plate 107 is connected to the bottoms of the first side plate 103, the second side plate 104, the third side plate 105, and the fourth side plate 106. The first side plate 103, the second side plate 104, the third side plate 105, the fourth side plate 106, and the bottom plate 107 together enclose a receiving cavity, and the battery module 1, the circuit board 4, the first heat dissipation structure 2 and the second heat dissipation structure 3 are located in the receiving cavity.

[0100] Specifically, ventilation holes can be opened on the housing 100, and the ventilation holes are connected to the first heat dissipation channel 20 and the second heat dissipation channel 30. Convection between the first heat dissipation channel 20, the second heat dissipation channel 30 and the external ambient air is achieved through the ventilation holes, further improving the heat dissipation efficiency.

[0101] The first ventilation holes 108 can be provided at positions corresponding to the first heat dissipation channels 20 of the housing 100. For example, first ventilation holes 108 can be provided at positions corresponding to the first heat dissipation channels 20 of both the third side panel 105 and the fourth side panel 106. The two first ventilation holes 108 can form the inlet and outlet of the first heat dissipation channels 20, respectively.

[0102] A second ventilation hole 109 may be provided on the housing 100 at a position corresponding to the second heat dissipation channel 30. For example, a second ventilation hole 109 may be provided on both the first side panel 103 and the second side panel 104 at a position corresponding to the second heat dissipation channel 30. The two second ventilation holes 109 may respectively form an inlet and an outlet of the second heat dissipation channel 30.

[0103] Convection between the first heat dissipation channel 20 , the second heat dissipation channel 30 and the external ambient air is achieved through the first ventilation holes 108 and the second ventilation holes 109 , thereby further improving the heat dissipation efficiency.

[0104] The first ventilation hole 108 and the second ventilation hole 109 can be strip-shaped holes, or circular holes, elliptical holes, etc. In addition, the first ventilation hole 108 and the second ventilation hole 109 can be one or more.

[0105] For example, an air cooling device may be provided at the first ventilation hole 108 and an air cooling device may be provided at the second ventilation hole 109 to further increase the air flow rate and thereby further improve the heat dissipation efficiency.

[0106] The battery pack provided in this embodiment comprises a battery module 1 including at least two battery cell assemblies 11 arranged along a first direction, and a battery cell assembly 11 including at least two battery cell units 111 arranged along a second direction. By providing a first heat dissipation structure 2 and a second heat dissipation structure 3, a first heat dissipation structure 2 is provided between at least two adjacent battery cell units 111. Since the first heat dissipation structure 2 has a first heat dissipation channel 20 communicating with the outside world, the heat of at least the battery cell unit 111 can be transferred to the external environment through the first heat dissipation channel 20. At the same time, the second heat dissipation structure 3 is provided between two adjacent battery cell assemblies 11. Since the second heat dissipation structure 3 has a second heat dissipation channel 30 connected to the outside world, at least the heat between the battery cell units 111 and adjacent battery cell assemblies 11 can be transferred to the external environment through the second heat dissipation channel 30. Moreover, the first heat dissipation channel 20 is connected to the second heat dissipation channel 30. In this way, the battery pack can dissipate heat in multiple directions through the two heat dissipation structures, so that the heat of the battery module 1 can be dissipated in time, reducing the temperature rise of the battery module 1, improving the heat dissipation effect of the battery pack, and avoiding thermal runaway of the battery pack to a certain extent, thereby improving the safety of the battery pack.

[0107] In addition, since the first heat dissipation channel 20 and the second heat dissipation channel 30 are connected, if one of the first heat dissipation channel 20 and the second heat dissipation channel 30 is accidentally blocked, the heat will be transferred to the external space of the battery pack through the other of the first heat dissipation channel 20 and the second heat dissipation channel 30, thereby ensuring timely and effective heat dissipation of the battery module 1 and further ensuring the heat dissipation effect.

[0108] Reference Figures 4 to 12 As shown, the second heat dissipation structure 3 includes two brackets 31, which are arranged along the first direction and spliced ​​together. The brackets 31 correspond to the battery cell assemblies 11 one by one, and each bracket 31 is connected to the first heat dissipation structure 2 in the corresponding battery cell assembly 11. The two brackets 31 together define a second heat dissipation channel 30.

[0109] By setting the second heat dissipation structure 3 as two brackets 31, during assembly, the first heat dissipation structure 2 can be placed in each battery cell assembly 11 first, so that the first heat dissipation structure 2 is located between two adjacent battery cell units 111, and then each bracket 31 is first connected to the first heat dissipation structure 2 in the corresponding battery cell assembly 11, and then the two brackets 31 are spliced ​​and connected, thereby improving the convenience of battery pack assembly.

[0110] That is, by setting the second heat dissipation structure 3 as above, the convenience of battery pack assembly is improved while achieving heat dissipation of the battery pack. In addition, during production, the two brackets 31 can be produced by a pair of molds, which is convenient to produce and saves production costs.

[0111] The bracket 31 may be specifically an aluminum bracket or a copper bracket to improve the heat conduction performance of the bracket 31 and thereby improve the heat dissipation efficiency of the battery pack.

[0112] In some embodiments, reference Figures 10 to 12 As shown, a vent 310 is opened on the bracket 31 , wherein one end of the first heat dissipation channel 20 is connected to the outside, the other end of the first heat dissipation channel 20 is connected to the vent 310 , and the vent 310 is connected to the second heat dissipation channel 30 .

[0113] That is, the first heat dissipation channel 20 and the second heat dissipation channel 30 are connected through the vent 310 , which has a simple structure and convenient design, and shortens the heat dissipation path, so that heat can be quickly discharged to the outside of the battery pack.

[0114] Specifically, the first heat dissipation structures 2 corresponding to two adjacent battery core assemblies 11 can also be connected through the vents 310. Figure 10 For example, the first heat dissipation channel 20 of the first heat dissipation structure 2 on the right side is connected to the first heat dissipation channel 20 of the first heat dissipation structure 2 on the left side through the vent 310, that is, convection can also be achieved between the first heat dissipation channels on the left and right sides, further improving the heat dissipation efficiency of the battery pack.

[0115] In some embodiments, a glue potting cavity 316 with an opening toward the circuit board is provided on a side of the bracket 31 facing the circuit board, and a glue potting hole 315 communicating with the glue potting cavity 316 is provided on the bracket 31 .

[0116] After the battery module 1, the circuit board 4, the first heat dissipation structure 2 and the second heat dissipation structure 3 are installed together, the entire structure is inverted, and then glue is poured into the glue hole 315. The glue enters the glue cavity 316 and then flows onto the circuit board 4, thereby achieving glue sealing of the circuit board 4.

[0117] By providing the glue injection hole 315 on the bracket 31, the structure of the bracket 31 is effectively utilized, so that the bracket 31 not only serves as a heat dissipation function, but also serves as a glue injection function. Among them, the glue injection cavity 316 provides a guide for the flow of the glue, which to a certain extent prevents the glue from flowing out, and improves the convenience of glue injection.

[0118] In some embodiments, the bracket 31 includes a main body portion 311 and a first splicing portion 312. The first splicing portion 312 is disposed on one side of the main body portion 311 along the first direction.

[0119] The first joint portion 312 includes an inclined wall 313 and an end wall 314. One end of the inclined wall 313 is connected to the main body 311, and the other end of the inclined wall 313 extends obliquely away from the main body 311. The end wall 314 is connected between the other end of the inclined wall 313 and the main body 311. The inclined walls 313 of the two brackets 31 are in contact with each other, and the end walls 314 of the two brackets 31 are arranged opposite each other along the second direction.

[0120] This arrangement plays a role of splicing guide to a certain extent, making the splicing of the two brackets 31 more convenient.

[0121] The inclined wall 313, the end wall 314 and the main body 311 define a glue injection cavity 316, and the glue injection hole 315 is provided on the end wall 314. Exemplarily, the inclined wall 313, the end wall 314 and the main body 311 together form a substantially triangular structure.

[0122] This arrangement makes the end wall 314 relatively larger in area. Disposing the glue injection hole 315 on the end wall 314 facilitates the larger size of the glue injection hole 315, thereby ensuring the flow rate and velocity of the glue and improving glue injection efficiency. Furthermore, the inclined arrangement of the inclined wall 313 also serves to guide the glue flow to a certain extent, further improving glue injection efficiency and convenience.

[0123] In some embodiments, the main body 311 is connected to the first heat dissipation structure 2. Connecting the main body 311 to the first heat dissipation structure 2 improves connection convenience. For example, the main body 311 is provided with a first mounting hole, and the first heat dissipation structure 2 is provided with a second mounting hole. The main body 311 is connected to the first heat dissipation structure 2 using screws, bolts, etc. inserted through the first and second mounting holes. Alternatively, the main body 311 is connected to the first heat dissipation structure 2 using a snap-fit ​​connection.

[0124] Specifically, the main body 311 can be configured as a plate-like structure, which facilitates the connection between the main body 311 and the first heat dissipation structure 2 while achieving heat dissipation. In addition, while the space between two adjacent battery cell assemblies 11 remains unchanged, the area of ​​the second heat dissipation channel 30 can be increased, thereby improving heat dissipation efficiency.

[0125] Reference Figures 10 to 13 As shown, in some embodiments, the bracket 31 includes two first splicing portions 312 , and the two first splicing portions 312 are disposed at two ends of the main body 311 along the third direction.

[0126] The projections of the inclined walls 313 of the two first splicing portions 312 of the bracket 31 along the third direction may intersect.

[0127] This arrangement makes the center of gravity of the bracket 31 more evenly distributed, thereby improving the heat dissipation effect and the stability of the bracket 31, thereby improving the stability of the entire second heat dissipation structure 3 and the stability of the battery pack.

[0128] The first splicing portions 312 of the two brackets 31 correspond to each other, and the two corresponding first splicing portions 312 are arranged in close contact with each other, which further improves the overall stability of the second heat dissipation structure 3.

[0129] In some embodiments, the first splicing portion 312 can be integrally formed with the main body portion 311 , which makes manufacturing and assembly more convenient and improves the structural strength of the entire bracket 31 .

[0130] Further, continue to refer to Figures 10 to 13 The bracket 31 may further include a second splicing portion 317 , the second splicing portion 317 and the first splicing portion 312 are arranged on the same side of the main body 311 along the first direction, and along the third direction, the second splicing portion 317 is located between the two first splicing portions 312 .

[0131] By providing the second splicing portion 317 , the structural strength of the bracket 31 is further improved, thereby improving the structural strength of the second heat dissipation structure 3 .

[0132] The second joints 317 of the two brackets 31 are arranged in close contact. This arrangement further improves the stability of the two brackets 31, thereby further improving the overall stability of the second heat dissipation structure 3. Furthermore, the second joints 317 of the two brackets 31 can divide the second heat dissipation duct into two sub-ducts arranged along the third direction. This can guide the air flow to a certain extent, increase the heat exchange contact area, and further improve heat dissipation efficiency.

[0133] In some embodiments, the second splicing portion 317 can be integrally formed with the main body portion 311 , which makes manufacturing and assembly more convenient and improves the structural strength of the entire bracket 31 .

[0134] In addition, by integrally forming the first splicing portion 312 and the second splicing portion 317 with the main body 311, the bracket 31 including the main body 311, the first splicing portion 312 and the second splicing portion 317 can be made using only one mold, which facilitates production and saves production costs.

[0135] Reference Figures 12 to 14 As shown, the bracket 31 is provided with a first engaging portion 32 and a second engaging portion 33, which are arranged at intervals on the bracket 31. The first engaging portion 32 on one bracket 31 corresponds to the second engaging portion 33 on the other bracket 31 and is matched and engaged.

[0136] In this way, the two brackets 31 can be spliced ​​together through the cooperation of the first clamping portion 32 and the second clamping portion 33, further improving the convenience of assembly.

[0137] For example, for one of the brackets 31 , the first engaging portion 32 and the second engaging portion 33 on the bracket 31 may be arranged at intervals along the second direction.

[0138] For example, the first engaging portion 32 and the second engaging portion 33 may be provided on the first splicing portion 312 or on the second splicing portion 317, or both the first splicing portion 312 and the second splicing portion 317 are provided with the first engaging portion 32 and the second engaging portion 33. Figure 12 and Figure 14 As shown, when the two brackets 31 are assembled, the first engaging portion 32 on the left bracket 31 is matched and engaged with the second engaging portion 33 on the right bracket 31 , and the second engaging portion 33 on the left bracket 31 is matched and engaged with the first engaging portion 32 on the right bracket 31 .

[0139] For example, when assembling the battery pack, the first heat dissipation structure 2 is first placed between two adjacent battery cell units 111 of each battery cell assembly 11, and then each bracket 31 is respectively connected to the first heat dissipation structure 2 in the corresponding battery cell assembly 11, and then the two brackets 31 are spliced ​​together so that the two brackets 31 are snapped together.

[0140] This embodiment makes the assembly of the battery pack more convenient by configuring the second heat dissipation structure 3 as two brackets 31. Compared with the solution of configuring the second heat dissipation structure 3 as an integral bracket structure, this configuration of this embodiment makes the connection between the bracket 31 and the first heat dissipation structure 2 more convenient.

[0141] Specifically, one of the first snap-fitting portion 32 and the second snap-fitting portion 33 can be a snap-fitting portion, and the other of the first snap-fitting portion 32 and the second snap-fitting portion 33 can be a snap-fitting hole that matches the snap-fitting portion. When the two brackets 31 are fitted together, the snap-fitting portion can be snapped into the corresponding snap-fitting hole, thereby realizing the snap-fitting of the two brackets 31, and the connection is convenient and reliable.

[0142] In some embodiments, the first engaging portion 32 and the second engaging portion 33 may be integrally formed with the bracket 31 .

[0143] This can improve the structural strength of the entire bracket 31 , and further improve the structural strength of the entire second heat dissipation structure 3 .

[0144] Reference Figures 10 to 14As shown, the bracket 31 is provided with an extension arm 34 extending in a direction away from the corresponding battery cell assembly 11 and a positioning groove 35 for the extension arm 34 to be engaged. The extension arm 34 on one bracket 31 is matched with the positioning groove 35 on the other bracket 31, the first engaging portion 32 is provided on the extension arm 34, and the second engaging portion 33 is provided in the positioning groove 35.

[0145] That is to say, when the two brackets 31 are put together, the extension arm 34 is exactly located in the positioning groove 35, realizing the first repositioning. At the same time, the first clamping portion 32 on the extension arm 34 is matched and engaged with the second clamping portion 33 in the positioning groove 35, realizing the second repositioning, thereby improving the clamping stability of the two brackets 31 and providing a guarantee for good heat dissipation of the battery pack.

[0146] Exemplarily, the first engaging portion 32 is a locking hole, and the second engaging portion 33 is a buckle. The locking hole is provided on the extension arm 34 , and the buckle is provided in the positioning groove 35 .

[0147] In some embodiments, for any bracket 31 , there are at least two first engaging portions 32 and at least two second engaging portions 33 .

[0148] In this way, positioning can be achieved from multiple positions of the bracket 31, further improving the engagement stability of the two brackets 31 and the structural stability of the battery pack.

[0149] For example, two extension arms 34 and a positioning slot 35 are provided on the first splicing portion 312 of one bracket 31 , and two positioning slots 35 and an extension arm 34 are provided on the first splicing portion 312 of the other bracket 31 .

[0150] Reference Figures 2 to 9 As shown, the first heat dissipation structure 2 includes a hollow heat dissipation plate 21, which is located between two adjacent battery core units 111. The inner cavity of the heat dissipation plate 21 forms at least a portion of the first heat dissipation channel 20.

[0151] In this way, the heat of the battery cell unit 111 is transferred to the outside through the first heat dissipation channel 20 on the heat dissipation plate 21, and heat exchange is achieved with the external air, thereby achieving heat dissipation of the battery cell unit 111 and the like.

[0152] Exemplarily, the heat dissipation plate 21 is, for example, an aluminum plate, which can further improve the heat dissipation effect.

[0153] In some embodiments, the heat dissipation plate 21 is in thermal contact with the outer surface of the battery cell unit 111 .

[0154] In this way, the heat of the battery cell unit 111 can be directly transferred to the heat dissipation plate 21, and heat is transferred to the outside through heat exchange with the cooling medium entering the first heat dissipation channel 20, thereby cooling the battery cell unit 111 and further improving the heat dissipation efficiency.

[0155] The heat conductive contact here can specifically be direct contact between the heat dissipation plate 21 and the outer surface of the battery cell unit 111. Alternatively, a heat conductive structure such as heat conductive foam or heat conductive glue can be provided between the heat dissipation plate 21 and the outer surface of the battery cell unit 111 to transfer heat from the battery cell unit 111 to the heat dissipation plate 21.

[0156] Combine Figure 1 、 Figure 8 and Figure 9 As shown, in some embodiments, heat dissipation fins 211 are provided in the inner cavity of the heat dissipation plate 21. This can increase the contact area between the heat dissipation plate 21 and the cooling medium passing through the first heat dissipation channel 20, thereby improving heat dissipation efficiency.

[0157] Specifically, there may be at least two heat dissipation fins 211, which are spaced apart along the third direction, so as to further increase the contact area between the heat dissipation plate 21 and the cooling medium and further improve the heat dissipation efficiency.

[0158] The heat dissipation fins 211 and the heat dissipation plate 21 can be integrally formed, which makes the manufacturing more convenient and improves the structural strength of the entire first heat dissipation structure 2.

[0159] Reference Figures 4 to 9 As shown, the first heat dissipation structure 2 further includes two end plates 22, which are disposed at both ends of the heat dissipation plate 21 along the first direction and are located outside the battery cell unit 111 along the first direction. A through hole 221 is formed in the end plate 22, and the end of the heat dissipation plate 21 is inserted into the through hole 221.

[0160] This arrangement, on the one hand, enables the two end plates 22 to limit the entire first heat dissipation structure 2 in the first direction, thereby improving the stability of the heat dissipation plate 21. On the other hand, the connection with the second heat dissipation structure 3 and the shell 100 can be achieved through the end plates 22, making the connection more convenient. For example, one of the end plates 22 is connected to the side plate of the shell 100, and the other end plate 22 is connected to the bracket 31. Exemplarily, mounting holes are provided on the main body 311 of the end plate 22 and the bracket 31, and the end plate 22 can be specifically connected to the main body 311 of the bracket 31 by bolts passing through the corresponding mounting holes. Exemplarily, mounting holes are provided on the side plates of the end plate 22 and the shell 100, and the end plate 22 and the side plates of the shell 100 are connected by bolts passing through the corresponding mounting holes.

[0161] Reference Figure 6 As shown, in some embodiments, the end plate 22 and the corresponding side sealing edge 113 have a distance F along the first direction.

[0162] On the one hand, when the battery pack is impacted, the spacing between the end plate 22 and the side seal 113 acts as a buffer, effectively protecting the battery cells 111 and preventing damage or explosion, thereby improving the safety of the battery pack. On the other hand, this arrangement can also, to a certain extent, prevent the side seal 113 from contacting the end plate 22 and causing a short circuit.

[0163] Specifically, the distance F between the end plate 22 and the corresponding side sealing edge 113 along the first direction can be set to be no less than 1.5 mm.

[0164] Exemplarily, the spacing F can be 1.5 mm, 1.55 mm, 1.6 mm, 1.65 mm, 1.7 mm, 1.75 mm, or 1.8 mm.

[0165] Such an arrangement can further enhance the impact buffering effect, protect the battery cell unit 111 , and further prevent the side sealing edge 113 from coming into contact with the end plate 22 .

[0166] Continue to refer to Figure 6 As shown, in some embodiments, a first waterproof member 5 is provided between the end plate 22 of the heat dissipation plate 21 at one end close to the second heat dissipation structure 3 and the second heat dissipation structure 3 .

[0167] Illustratively, the first waterproof member 5 may be sandwiched between the end plate 22 and the main body 311 .

[0168] By providing the first waterproof component 5, impurities such as moisture can be prevented from entering the battery cell unit 111 from between the end plate 22 and the second heat dissipation structure 3, thereby avoiding the risks of corrosion, short circuit, etc. of the battery cell unit 111 when it comes into contact with water, thereby protecting the battery cell unit 111 and improving the safety of the battery pack.

[0169] The first waterproof member 5 can be made of, for example, an elastic material. Since it has a certain elastic buffering effect, it can improve the sealing and waterproofing effect while also compensating for the assembly error between the end plate 22 and the second heat dissipation structure 3 .

[0170] The first waterproof member 5 can be specifically made of thermally conductive foam, which can improve the sealing between the end plate 22 and the second heat dissipation structure 3 while also improving the thermal conductivity between the end plate 22 and the second heat dissipation structure 3, thereby improving the overall heat dissipation effect of the battery pack.

[0171] Reference Figure 7As shown, in some embodiments, a second waterproof member 6 is provided between the end plate 22 of the heat dissipation plate 21 at one end away from the second heat dissipation structure 3 and the housing 100 .

[0172] By providing the second waterproof component 6, impurities such as moisture can be prevented from entering the battery cell unit 111 from between the end plate 22 and the side plate of the shell 100, thereby avoiding the risks of corrosion, short circuit, etc. of the battery cell unit 111 when it comes into contact with water, thereby protecting the battery cell unit 111 and improving the safety of the battery pack.

[0173] For example, when the end plate 22 and the side plate of the housing 100 are connected together by fasteners such as bolts or screws, the second waterproof member 6 can be sandwiched between the end plate 22 and the side plate of the housing 100 .

[0174] The second waterproof member 6 can be made of, for example, an elastic material. Due to its elastic buffering effect, it can improve the sealing and waterproofing effect while also better matching the gap between the end plate 22 and the housing 100 to compensate for assembly errors.

[0175] The second waterproof member 6 can be made of thermally conductive foam. This improves the sealing between the end plate 22 and the housing 100 while also improving the thermal conductivity between the end plate 22 and the housing 100, allowing heat to be transferred to the housing 100 and then dissipated to the outside of the battery pack, thereby improving the overall heat dissipation effect of the battery pack.

[0176] Of course, in other implementations, the first waterproof component 5 and the second waterproof component 6 can also be sealing rubber rings, etc.

[0177] Reference Figure 4 and Figure 5 As shown, in some embodiments, in each battery cell assembly 11 , a second heat conducting member 7 is provided between at least two adjacent battery cell units 111 , and the second heat conducting member 7 is in thermal contact with the battery cell units 111 .

[0178] In this way, the heat generated by the battery cell unit 111 is transferred to the second heat conducting member 7 , thereby reducing the heat of the battery cell unit 111 , preventing the battery cell unit 111 from overheating, and further improving the heat dissipation efficiency of the battery cell unit 111 .

[0179] For example, the second heat conducting member 7 can be a thermally conductive foam. The thermally conductive foam not only conducts heat to the battery cell 111, but also, due to its elasticity, acts as a buffer when the battery cell 111 expands during charging and discharging, providing a certain degree of protection for the battery cell 111 and improving the safety of the battery pack.

[0180] In some embodiments, the compression amount a of the thermally conductive foam may be set to: 20%≤a≤80%. For example, the compression amount a may be 20%, 30%, 40%, 50%, 60%, 70%, or 80%.

[0181] By setting the compression amount of the thermal conductive foam within the above range to ensure the deformability of the second thermal conductive member 7, the thermal conductive foam can better match the gap between adjacent battery cells 111 and better fit with the battery cells 111, thereby further improving the heat dissipation effect.

[0182] In specific implementation, if the thickness of the second heat conducting member 7 is set too small, it will affect the heat conduction effect. However, if the thickness of the second heat conducting member 7 is set too thick, the thickness of the entire battery cell assembly 11 will increase, thereby causing the battery pack to be too thick. Based on this, refer to Figure 5 As shown, in some embodiments, the thickness b of the second heat conducting member 7 along the second direction can specifically satisfy the following: 0.7 mm ≤ b ≤ 2 mm.

[0183] Exemplarily, the thickness b can be 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.3 mm, 1.35 mm, 1.5 mm, 1.8 mm, or 2.0 mm.

[0184] By setting the thickness of the second heat conducting member 7 within the above range, the heat dissipation effect on the battery cell unit 111 is ensured while ensuring that the battery cell assembly 11 is not too thick.

[0185] Of course, in other implementations, the second heat-conducting member 7 may also be a heat-conducting colloid, etc.

[0186] In some embodiments, at least two second heat conducting members 7 are disposed between two adjacent battery core units 111 , and the at least two second heat conducting members 7 are arranged at intervals between the two adjacent battery core units 111 .

[0187] This further increases the contact area between the battery cell unit 111 and the second heat conducting member 7 , further improving the heat dissipation effect.

[0188] In a specific implementation, at least two second heat conducting members 7 are arranged between two adjacent battery core units 111 along the first direction, for example. For another example, at least two second heat conducting members 7 are arranged between two adjacent battery core units 111 along the second direction.

[0189] In some embodiments, the battery cell assembly 11 includes at least three battery cell units 111 , wherein a first heat dissipation structure 2 is disposed between two adjacent battery cell units 111 , and wherein a second heat conducting member 7 is disposed between another two adjacent battery cell units 111 .

[0190] This arrangement improves the overall heat dissipation effect of the battery cell assembly 11, wherein the battery cell unit 111 located in the middle can not only achieve heat exchange with the first heat dissipation structure 2, but also achieve heat exchange with the second heat conducting member 7, further improving the heat dissipation efficiency.

[0191] For example, for any battery core assembly 11 , the first heat dissipation structures 2 and the second heat conducting members 7 may be alternately arranged along the second direction.

[0192] For example, when the second heat conducting member 7 is a heat conducting foam, the above arrangement can not only improve the heat dissipation effect, but also play an expansion buffering role to a certain extent, and play a certain protective role for the battery cell unit 111 and the first heat dissipation structure 2.

[0193] Reference Figure 10 As shown, in some embodiments, a first heat conducting member 8 is provided on the outer surface of the outermost battery cell unit 111 along the second direction.

[0194] In this way, the heat of the outermost battery cell unit 111 can be transferred to the first heat conducting member 8 , further improving the heat dissipation performance of the outermost battery cell unit 111 .

[0195] In some embodiments, the first heat conducting member 8 may specifically include: a heat conducting foam disposed on the outer surface of the battery cell unit 111 and a graphite layer disposed at least on a side of the heat conducting foam facing away from the battery cell unit 111 .

[0196] Due to the good thermal conductivity of graphite, the heat dissipation effect of the battery cell unit 111 is further improved by arranging a graphite layer on the thermally conductive foam.

[0197] In some embodiments, the projection area of ​​the first heat conducting member 8 on the outermost battery cell unit 111 is not less than ½ of the area of ​​the outer surface of the battery cell unit 111 .

[0198] In this way, the contact area between the battery cell unit 111 and the first heat conducting member 8 can be further ensured, thereby increasing the heat conducting area and improving the heat dissipation effect of the battery cell unit 111 .

[0199] Of course, in other implementations, the first heat-conducting member 8 may also be a heat-conducting colloid, etc.

[0200] An embodiment of the present invention further provides a battery pack system, including a battery pack.

[0201] The battery pack in this embodiment has the same specific structure and implementation principle as the battery pack provided in the above embodiment, and can bring the same or similar technical effects. They will not be described one by one here, and the details can be referred to the description of the above embodiment.

[0202] The battery pack system may further include an air cooling device, for which details may refer to the description of the above embodiment.

[0203] This embodiment also provides an electrical device, which includes a battery pack. The battery pack can be used as a power source or energy storage unit for the electrical device. The electrical device can be, but is not limited to, a pure electric vehicle, a hybrid electric vehicle, an electric bicycle, an electric motorcycle, a drone, etc.

[0204] In this document, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication 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 the specific circumstances. In addition, the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this 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 to this application.

[0205] In this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0206] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: It comprises a battery module (1) and a heat dissipation structure (2); The battery module (1) comprises at least two battery cell assemblies (11), and the at least two battery cell assemblies (11) are arranged along a first direction; the battery cell assembly (11) comprises at least two battery cell units (111), and the at least two battery cell units (111) are arranged along a second direction; In each of the battery cell assemblies (11), the heat dissipation structure (2) is provided between at least two adjacent battery cell units (111), the heat dissipation structure (2) having a first heat dissipation channel (20) communicating with the outside, and a first heat conducting member (8) is provided on the outer surface of the outermost battery cell unit (111) along the second direction, the projected area of ​​the first heat conducting member (8) on the outermost battery cell unit (111) is not less than 1 / 2 of the area of ​​the outer surface of the battery cell unit (111).

2. The battery pack according to claim 1, wherein: The heat dissipation structure (2) comprises a hollow heat dissipation plate (21), wherein the heat dissipation plate (21) is located between two adjacent battery core units (111); the inner cavity of the heat dissipation plate (21) forms at least a portion of the first heat dissipation channel (20).

3. The battery pack according to claim 2, wherein: The heat dissipation plate (21) is in thermal contact with the outer surface of the battery core unit (111); And / or, heat dissipation fins (211) are provided in the inner cavity of the heat dissipation plate (21); There are at least two heat dissipation fins (211), and at least two of the heat dissipation fins (211) are arranged at intervals along the third direction; And / or, the heat dissipation fins (211) and the heat dissipation plate (21) are integrally formed.

4. The battery pack according to claim 2, wherein: The heat dissipation structure (2) further comprises two end plates (22), the two end plates (22) being respectively arranged at two ends of the heat dissipation plate (21) along the first direction, and the two end plates (22) being located on the outside of the battery cell unit (111) along the first direction; A through hole (221) is provided on the end plate (22), and the end of the heat dissipation plate (21) is passed through the through hole (221).

5. The battery pack according to claim 4, characterized in that: The battery cell unit (111) comprises a battery cell shell (112) and an electrode assembly located in the battery cell shell (112), and side sealing edges (113) are respectively provided on both sides of the battery cell shell (112) along the first direction; The end plate (22) and the corresponding side sealing edge (113) have a spacing along the first direction, and the spacing is not less than 1.5 mm.

6. The battery pack according to claim 1, wherein: In each of the battery core assemblies (11), a second heat conducting member (7) is provided between at least two adjacent battery core units (111), and the second heat conducting member (7) is in thermal contact with the battery core units (111).

7. The battery pack according to claim 6, characterized in that: The battery core assembly (11) comprises at least three battery core units (111), wherein the heat dissipation structure (2) is provided between two adjacent battery core units (111), and wherein the second heat conducting member (7) is provided between another two adjacent battery core units (111); And / or, at least two second heat-conducting members (7) are provided between two adjacent battery core units (111), and at least two second heat-conducting members (7) are arranged at intervals between two adjacent battery core units (111).

8. The battery pack according to claim 6, wherein: The battery core assembly (11) comprises at least three battery core units (111), wherein the heat dissipation structure (2) is provided between two adjacent battery core units (111), and wherein the second heat conducting member (7) is provided between another two adjacent battery core units (111); The second heat-conducting member (7) is a heat-conducting foam, and the compression amount a of the heat-conducting foam satisfies: 20%≤a≤80%; And / or, the thickness b of the second heat conducting member (7) along the second direction satisfies: 0.7 mm ≤ b ≤ 2 mm.

9. The battery pack according to claim 1, wherein: The first heat-conducting member (8) comprises a heat-conducting foam arranged on the outer surface of the battery cell unit (111) and a graphite layer arranged at least on a side of the heat-conducting foam facing away from the battery cell unit (111).

10. An electrical device, characterized in that: Comprising the battery pack according to any one of claims 1 to 9.

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