Battery packs, battery pack systems and electrical equipment

Abstract

The present invention provides a battery pack, a battery pack system and an electrical device, wherein the battery pack comprises a battery module, a first heat dissipation structure and a second heat dissipation structure; the battery module comprises at least two battery cell assemblies, and at least two battery cell assemblies are arranged along a first direction; the battery cell assembly comprises at least two battery cell units, and 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 has a first heat dissipation channel connected to the outside; the second heat dissipation structure is arranged between two adjacent battery cell assemblies, and the second heat dissipation structure has a second heat dissipation channel connected to the outside; the first heat dissipation channel and the second heat dissipation channel are connected, and the second heat dissipation structure comprises two brackets, 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, thereby improving the heat dissipation performance and safety of the battery pack.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack, a battery pack system and electrical equipment. Background Art

[0002] 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.

[0003] The battery pack specifically includes: a shell and a battery module. The battery module is located inside the shell and specifically includes multiple battery cells. The battery pack generates heat when it is working. If the temperature rise of the battery module is too large and the heat cannot be dissipated in time, it will cause thermal runaway of the battery pack, which will lead to accidents such as fire and explosion. Summary of the invention

[0004] In view of this, the embodiments of the present invention are directed to providing a battery pack, a battery pack system, and an electrical device, so as to improve the heat dissipation performance and safety performance of the battery pack to a certain extent.

[0005] In a first aspect, the present invention provides a battery pack, including a battery module, a first heat dissipation structure, and a second heat dissipation structure;

[0006] The battery module comprises at least two battery cell assemblies, and the at least two battery cell assemblies are arranged along a first direction; the battery cell assembly comprises at least two battery cell units, and at least two of the battery cell units are arranged along a second direction;

[0007] In each of the battery cell assemblies, the first heat dissipation structure is arranged between at least two adjacent battery cell units, and the first heat dissipation structure has a first heat dissipation channel communicating with the outside;

[0008] 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 connected to the outside; the first heat dissipation channel is connected to the second heat dissipation channel;

[0009] The second heat dissipation structure includes two brackets, which are arranged along the first direction and spliced ​​together, and the brackets correspond to the battery cell assemblies one by one. Each of the brackets 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.

[0010] Optionally, a vent is provided on the bracket;

[0011] 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.

[0012] 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;

[0013] A glue potting cavity with an opening facing the circuit board is arranged on one side of the bracket facing the circuit board, and a glue potting hole communicating with the glue potting cavity is arranged on the bracket.

[0014] Optionally, the bracket includes a main body and a first splicing portion; the first splicing portion is arranged on one side of the main body along the first direction;

[0015] The first joint 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 in a direction away from the main body, and the end wall is connected between the other end of the inclined wall and the main body;

[0016] The inclined wall, the end wall and the main body together define the glue pouring cavity, and the glue pouring hole is arranged on the end wall;

[0017] 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.

[0018] Optionally, the bracket includes a main body and a first splicing portion; the first splicing portion is arranged on one side of the main body along the first direction;

[0019] The first joint 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 in a direction away from the main body, and the end wall is connected between the other end of the inclined wall and the main body;

[0020] The inclined walls of the two brackets are arranged in close contact with each other, and along the second direction, the end walls of the two brackets are arranged opposite to each other.

[0021] Optionally, the main body is connected to the first heat dissipation structure;

[0022] 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;

[0023] And / or, the main body is a plate-like structure.

[0024] Optionally, the bracket includes two first splicing parts, and the two first splicing parts are arranged at two ends of the main body along the third direction;

[0025] The projections of the inclined walls of the two first joint portions along the third direction intersect.

[0026] 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.

[0027] Optionally, a first clamping portion and a second clamping portion are provided on the bracket, and the first clamping portion and the second clamping portion are arranged at intervals on the bracket;

[0028] The first engaging portion on one of the brackets corresponds to and is matched with the second engaging portion on another of the brackets.

[0029] 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 locking hole that matches and engages with the buckle;

[0030] 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 inserted into; the extension arm on one of the brackets is matched and connected with the positioning groove on another of the brackets, the first clamping portion is provided on the extension arm, and the second clamping portion is provided in the positioning groove;

[0031] And / or, the number of the first engaging parts is at least two, and the number of the second engaging parts is at least two;

[0032] And / or, the first engaging portion, the second engaging portion and the bracket are integrally formed.

[0033] Optionally, the first heat dissipation structure includes a hollow heat dissipation plate, which is located between two adjacent battery core units; an inner cavity of the heat dissipation plate forms at least a portion of the first heat dissipation channel.

[0034] Optionally, the heat dissipation plate is in thermal contact with the outer surface of the battery cell unit;

[0035] And / or, heat dissipation fins are arranged in the inner cavity of the heat dissipation plate;

[0036] 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;

[0037] And / or, the heat dissipation fins and the heat dissipation plate are integrally formed.

[0038] 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 outer sides of the battery cell unit along the first direction;

[0039] The end plate is provided with a through hole, and the end of the heat dissipation plate is inserted into the through hole.

[0040] Optionally, the battery cell unit comprises a battery cell shell and an electrode assembly located in the battery cell shell, and side sealing edges are respectively provided on both sides of the battery cell shell along the first direction;

[0041] 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;

[0042] 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;

[0043] 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.

[0044] Optionally, in each of the battery cell assemblies, a first heat conductive member is disposed between at least two adjacent battery cell units, and the first heat conductive member is in thermal contact with the battery cell units.

[0045] Optionally, the battery core assembly includes at least three battery core units, wherein the first heat dissipation structure is arranged between two adjacent battery core units, and wherein the first heat conductive member is arranged between another two adjacent battery core units;

[0046] And / or, at least two of the first heat conducting members are arranged between two adjacent battery core units, and at least two of the first heat conducting members are arranged at intervals between the two adjacent battery core units;

[0047] And / or, the first heat-conducting member is a heat-conducting foam, and the compression amount a of the heat-conducting foam satisfies: 20%≤a≤80%;

[0048] And / or, a thickness b of the first heat conducting member along the second direction satisfies: 0.7 mm≤b≤2 mm.

[0049] Optionally, a second heat conducting member is provided on the outer surface of the outermost battery core unit along the second direction.

[0050] Optionally, the second heat-conducting member includes a heat-conducting foam disposed on the outer surface of the battery cell unit and a graphite layer disposed at least on a side of the heat-conducting foam away from the battery cell unit;

[0051] And / or, a projection area of ​​the second heat conducting member on the outermost battery cell unit is not less than 1 / 2 of an area of ​​an outer surface of the battery cell unit.

[0052] Optionally, the battery pack further includes a shell;

[0053] The battery module, the first heat dissipation structure and the second heat dissipation structure are located in the housing;

[0054] A first ventilation hole is arranged at a position of the shell corresponding to the first heat dissipation channel, and a second ventilation hole is arranged at a position of the shell corresponding to the second heat dissipation channel.

[0055] In a second aspect, the present invention provides a battery pack system, comprising the battery pack as described above.

[0056] Optionally, the battery pack system further includes an air cooling device;

[0057] The air cooling device is disposed corresponding to the first heat dissipation channel; and / or the air cooling device is disposed corresponding to the second heat dissipation channel.

[0058] In a third aspect, the present invention provides an electrical device, comprising the battery pack as described above, or comprising the battery pack system as described above.

[0059] The battery pack, battery pack system 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, and the battery cell assembly includes at least two battery cell units arranged along a second direction. By setting a first heat dissipation structure and a second heat dissipation structure, the first heat dissipation structure is arranged between at least two adjacent battery cell units. Since the first 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 arranged 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 achieve heat dissipation 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.

[0060] 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.

[0061] 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 ​​and connected, 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, and the two brackets jointly define the second heat dissipation channel. This arrangement allows each bracket to be connected to the first heat dissipation structure in the corresponding battery cell component during assembly, and then the two brackets can be spliced ​​and connected, thereby achieving heat dissipation of the battery pack while improving the convenience of battery pack assembly, and improving the overall stability of the first heat dissipation structure and the second heat dissipation structure, providing further guarantee for good heat dissipation of the battery pack. In addition, during production, the two brackets can be produced by a pair of molds, which is convenient to produce and saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic structural diagram of a battery pack according to an embodiment of the present invention.

[0063] Figure 2 FIG. 1 is an exploded structural diagram of a battery pack according to an embodiment of the present invention.

[0064] Figure 3 It is a schematic structural diagram of a shell body, a first heat dissipation structure, a second heat dissipation structure and a battery module of a battery pack according to an embodiment of the present invention.

[0065] Figure 4 for Figure 3 The corresponding top view of the structure.

[0066] Figure 5 for Figure 4 Enlarged view of the structure at I in the middle.

[0067] Figure 6 for Figure 5 Enlarged view of the structure at C in the middle.

[0068] Figure 7 for Figure 4 A magnified view of the structure at center.

[0069] Figure 8 A schematic diagram of the structure of a battery module, a first heat dissipation structure and a second heat dissipation structure of a battery pack according to an embodiment of the present invention Figure 1 .

[0070] Fig. 9It is a structural schematic diagram of a first heat dissipation structure in a battery pack according to an embodiment of the present invention.

[0071] Fig.10 A schematic diagram of the structure of a battery module, a first heat dissipation structure and a second heat dissipation structure of a battery pack according to an embodiment of the present invention Figure 2 .

[0072] Fig.11 for Fig.10 Enlarged view of the structure at M in the middle.

[0073] Fig.12 It is a structural schematic diagram of a second heat dissipation structure in a battery pack according to an embodiment of the present invention.

[0074] Fig.13 It is a schematic diagram of the structure of a bracket in a battery pack according to an embodiment of the present invention.

[0075] Fig.14 It is a schematic diagram of the local structure of two brackets in a battery pack according to an embodiment of the present invention when they are locked together.

[0076] Among them, 1. battery module; 11. battery cell assembly; 111. battery cell unit; 112. battery cell shell; 113. side sealing edge; 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, first heat-conducting part; 8, second heat-conducting part; 100, shell; 101, shell body; 102, upper cover; 103, first side plate; 104, second side plate; 105, third side plate; 106, fourth side plate; 107, bottom plate; 108, first ventilation hole; 109, second ventilation hole. DETAILED DESCRIPTION

[0077] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0078] The battery pack includes: a housing, a battery module and a circuit board, and the battery module and the circuit board are arranged in the housing. The battery module may include multiple battery cells, and the multiple battery cells may be arranged in a preset direction. The circuit board is connected to the battery module, for example, for monitoring and managing the status of the battery module, and the status of the battery module may include, for example, current, voltage, temperature, etc.

[0079] The battery pack will generate heat when working. If the heat cannot be 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.

[0080] Based on this, an embodiment of the present invention provides a battery pack, a battery pack system 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, and heat dissipation of the battery pack is achieved through the two heat dissipation structures, thereby 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.

[0081] The battery pack, battery pack system and electrical equipment provided by the present invention are described in detail below with reference to the accompanying drawings through specific embodiments:

[0082] 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.

[0083] The battery module 1 includes at least two battery cell assemblies 11, and the at least two battery cell assemblies 11 are arranged along the first direction. Each battery cell assembly 11 includes at least two battery cell units 111, and the at least two battery cell units 111 are arranged along the second direction.

[0084] The circuit board 4 may be located on one side of the battery module 1 along the third direction, and the circuit board 4 is electrically connected to the battery module 1 , for example, being able to monitor and manage the current, voltage and other states of the battery module 1 .

[0085] Reference Figure 1 As shown, the first direction in this article is Figure 1 The X direction in the figure may be specifically the length direction of the battery pack. The second direction may be, for example, Figure 1 The Y direction in the figure may be specifically the width direction of the battery pack. The third direction may be, for example, Figure 1 The Z direction may specifically be the height direction of the battery pack.

[0086] 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.

[0087] The battery cell shell 112 has a top sealing edge on one side along the third direction. For example, the positive electrode tab and the negative electrode tab can both extend from the top sealing edge and be connected to the circuit board 4. The battery cell shell 112 has side sealing edges 113 on both sides along the first direction.

[0088] Among them, in each battery cell assembly 11 , a first heat dissipation structure 2 is disposed 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.

[0089] The second heat dissipation structure 3 is disposed between two adjacent battery core assemblies 11, and the second heat dissipation structure 3 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.

[0090] 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 generated 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 achieving heat dissipation of the battery pack, reducing the temperature rise of the battery pack, and improving the safety of the battery pack.

[0091] Taking 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 as an example, it is explained that 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 the first heat dissipation structure 2 can be set 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.

[0092] In specific implementation, there can be two, three or more battery cell assemblies 11. Take 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 for explanation: 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.

[0093] Among them, the first heat dissipation channel 20 and the second heat dissipation channel 30 are connected. Exemplarily, specifically, at least part of the heat in the battery pack is directly transferred to the outside of the battery pack through the first heat dissipation channel 20. For another example, at least part of the heat in the battery pack is directly transferred to the outside of the battery pack through the second heat dissipation channel 30. For another example, the heat in the battery pack flows to the outside of the battery pack through the first heat dissipation channel 20 and the second heat dissipation channel 30, thereby achieving heat dissipation of the battery pack and improving the safety of the battery pack.

[0094] In specific implementation, an air cooling device may be provided, which may be a device such as a fan that can drive air flow. 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.

[0095] For example, the air cooling device can drive the air outside the battery pack into the first heat dissipation channel 20, take away the heat generated by the battery cell unit 111, etc., and flow out of the battery pack from the first heat dissipation channel 20 or the second heat dissipation channel 30. For another example, the air cooling device can drive the gas outside the battery pack into the second heat dissipation channel 30, take away the heat inside the battery pack, and flow out of the battery pack from the other end of the second heat dissipation channel 30 or from the first heat dissipation channel 20.

[0096] The air cooling device can be in a blowing mode or an exhaust mode.

[0097] 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.

[0098] Of course, in other implementations, water cooling can also be used to dissipate heat from the battery pack, that is, a coolant is introduced into the first heat dissipation channel 20 and the second heat dissipation channel 30, and the coolant is, for example, cooling water, and heat exchange with the battery cell unit 111 is achieved through the coolant to absorb the heat in the battery pack and dissipate heat from the battery pack. For example, in order to prevent leakage of the coolant, the first heat dissipation channel 20 and the second heat dissipation channel 30 can be connected only to the outside.

[0099] 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 in the housing 100.

[0100] Reference Figure 1 and Figure 2As 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 .

[0101] The first side plate 103 and the second side plate 104 are arranged opposite to each other along the second direction, the third side plate 105 and the fourth side plate 106 are arranged opposite to 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 bottom 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 and the fourth side plate 106 and the bottom plate 107 are enclosed together to form 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.

[0102] 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.

[0103] The first ventilation holes 108 may be provided at positions of the housing 100 corresponding to the first heat dissipation channel 20. For example, the first ventilation holes 108 may be provided at positions of the third side plate 105 and the fourth side plate 106 corresponding to the first heat dissipation channel 20. The two first ventilation holes 108 may respectively form the inlet and outlet of the first heat dissipation channel 20.

[0104] The second ventilation holes 109 may be provided at positions corresponding to the second heat dissipation channel 30 of the housing 100, for example, the second ventilation holes 109 may be provided at positions corresponding to the second heat dissipation channel 30 of the first side plate 103 and the second side plate 104. The two second ventilation holes 109 may respectively form the inlet and the outlet of the second heat dissipation channel 30.

[0105] The first ventilation holes 108 and the second ventilation holes 109 enable convection between the first heat dissipation channel 20 , the second heat dissipation channel 30 and the external ambient air, thereby further improving the heat dissipation efficiency.

[0106] The first ventilation hole 108 and the second ventilation hole 109 may be bar-shaped holes, or circular holes, elliptical holes, etc. In addition, the first ventilation hole 108 and the second ventilation hole 109 may be one or more.

[0107] Exemplarily, 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 thus further improve the heat dissipation efficiency.

[0108] 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 arranging a first heat dissipation structure 2 and a second heat dissipation structure 3, a first heat dissipation structure 2 is arranged between at least two adjacent battery cell units 111. Since the first heat dissipation structure 2 has a first heat dissipation channel 20 connected to the outside, at least the heat of the battery cell unit 111 can be transferred to the outside environment through the first heat dissipation channel 20. At the same time, the second heat dissipation structure 3 is arranged 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, at least the heat between the battery cell unit 111 and the adjacent battery cell components 11 can be transferred to the external environment through the second heat dissipation channel 30, and 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, the temperature rise of the battery module 1 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.

[0109] 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.

[0110] 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, and the brackets 31 correspond to the battery cell assemblies 11 one by one, and each bracket 31 is respectively 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.

[0111] 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.

[0112] That is to say, 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.

[0113] The bracket 31 may specifically be an aluminum bracket or a copper bracket to improve the thermal conductivity of the bracket 31 and thereby improve the heat dissipation efficiency of the battery pack.

[0114] In some embodiments, reference Figures 10 to 12 As shown, a vent 310 is provided 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 .

[0115] That is to say, the first heat dissipation channel 20 and the second heat dissipation channel 30 are connected through the vent 310, so that the structure is simple and the design is convenient, and the heat dissipation path is shorter, so that the heat can be quickly discharged to the outside of the battery pack.

[0116] Specifically, the first heat dissipation structures 2 corresponding to two adjacent battery core assemblies 11 can also be connected through the vents 310. Fig.10 For example, the first heat dissipation channel 20 of the first heat dissipation structure 2 on the right is connected to the first heat dissipation channel 20 of the first heat dissipation structure 2 on the left 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.

[0117] In some embodiments, a glue potting cavity 316 with an opening toward the circuit board is disposed 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 disposed on the bracket 31 .

[0118] 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 whole structure is inverted, and then glue is poured into the glue filling hole 315, and the glue enters the glue filling cavity 316 and then flows onto the circuit board 4, thereby achieving glue sealing of the circuit board 4.

[0119] By setting the glue injection hole 315 on the bracket 31, the structure of the bracket 31 itself is effectively utilized, so that the bracket 31 not only plays a role in heat dissipation, but also plays a role in glue injection. Among them, the glue injection cavity 316 provides a guide for the flow of the colloid, which to a certain extent prevents the colloid from flowing out, and improves the convenience of glue injection.

[0120] 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.

[0121] 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 in a direction 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 fit together, and along the second direction, the end walls 314 of the two brackets 31 are arranged opposite to each other.

[0122] Such a configuration plays a role of splicing guide to a certain extent, making the splicing of the two brackets 31 more convenient.

[0123] 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.

[0124] This arrangement makes the area of ​​the end wall 314 relatively larger, and the glue injection hole 315 is arranged on the end wall 314, which is conducive to setting the glue injection hole 315 larger, thereby ensuring the flow rate and flow rate of the colloid and improving the glue injection efficiency. In addition, the inclined arrangement of the inclined wall 313 also plays a role in guiding the glue to a certain extent, further improving the glue injection efficiency and convenience of glue injection.

[0125] In some embodiments, the main body 311 is connected to the first heat dissipation structure 2. By connecting the main body 311 to the first heat dissipation structure 2, the convenience of connection is improved. Exemplarily, a first mounting hole is provided on the main body 311, and a second mounting hole is provided on the first heat dissipation structure 2. The main body 311 is connected to the first heat dissipation structure 2 by screws, bolts, etc. that are inserted through the first mounting hole and the second mounting hole. Alternatively, the main body 311 is connected to the first heat dissipation structure 2 by a snap-fit ​​connection.

[0126] Specifically, the main body 311 can be set as a plate-like structure, so that while achieving heat dissipation, it is convenient to connect the main body 311 with the first heat dissipation structure 2. In addition, when the space between two adjacent battery core components 11 remains unchanged, the area of ​​the second heat dissipation channel 30 can be increased, thereby improving the heat dissipation efficiency.

[0127] 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 arranged at two ends of the main body 311 along the third direction.

[0128] The projections of the inclined walls 313 of the two first splicing portions 312 of the bracket 31 along the third direction may intersect.

[0129] 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.

[0130] 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, thus further improving the overall stability of the second heat dissipation structure 3 .

[0131] In some embodiments, the first joint 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 .

[0132] 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 .

[0133] 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 .

[0134] Among them, the second joint parts 317 of the two brackets 31 are arranged in a close relationship. Such an arrangement further improves the stability of the cooperation of the two brackets 31, and further improves the overall stability of the second heat dissipation structure 3. Moreover, the second joint parts 317 of the two brackets 31 can divide the second heat dissipation air duct into two sub-air ducts arranged along the third direction, which can guide the flow direction of the wind to a certain extent, increase the heat exchange contact area, and further improve the heat dissipation efficiency.

[0135] In some embodiments, the second joint 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 .

[0136] 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 manufactured using only one mold, which is convenient to manufacture and saves manufacturing costs.

[0137] Reference Figure 12 to Figure 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 another bracket 31 and is matched and engaged.

[0138] 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, which further improves the convenience of assembly.

[0139] Exemplarily, 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, for example.

[0140] Exemplarily, 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. Fig.12 and Fig.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 .

[0141] Exemplarily, 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 snap-connected together.

[0142] 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.

[0143] Specifically, one of the first snap-fitting portion 32 and the second snap-fitting portion 33 can be a buckle, and the other of the first snap-fitting portion 32 and the second snap-fitting portion 33 can be a hole that matches the buckle. When the two brackets 31 are fitted together, the buckle is just inserted into the corresponding hole, thereby realizing the snap-fitting of the two brackets 31, and the connection is convenient and reliable.

[0144] In some embodiments, the first engaging portion 32 and the second engaging portion 33 may be integrally formed with the bracket 31 .

[0145] In this way, the structural strength of the entire bracket 31 can be improved, thereby improving the structural strength of the entire second heat dissipation structure 3 .

[0146] 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 inserted into. The extension arm 34 on one of the brackets 31 is matched and connected with the positioning groove 35 on the other bracket 31, the first clamping portion 32 is provided on the extension arm 34, and the second clamping portion 33 is provided in the positioning groove 35.

[0147] That is to say, when the two brackets 31 are assembled together, the extension arm 34 is exactly located in the positioning groove 35 to achieve 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 to achieve 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.

[0148] Exemplarily, the first engaging portion 32 is, for example, a engaging hole, and the second engaging portion 33 is a buckle. The engaging hole is disposed on the extension arm 34 , and the buckle is disposed in the positioning groove 35 .

[0149] In some embodiments, for any bracket 31 , there are at least two first engaging portions 32 and at least two second engaging portions 33 .

[0150] 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.

[0151] For example, two extension arms 34 and one positioning groove 35 are disposed on the first splicing portion 312 of one of the brackets 31 , and two positioning grooves 35 and one extension arm 34 are disposed on the first splicing portion 312 of the other bracket 31 .

[0152] Reference Figures 2 to 9 As shown, the first heat dissipation structure 2 includes a hollow heat dissipation plate 21, and 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 part of the first heat dissipation channel 20.

[0153] 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.

[0154] Exemplarily, the heat dissipation plate 21 is, for example, an aluminum plate, which can further improve the heat dissipation effect.

[0155] In some embodiments, the heat dissipation plate 21 is in thermal contact with the outer surface of the battery cell unit 111 .

[0156] In this way, the heat of the battery cell unit 111 can be directly transferred to the heat dissipation plate 21, and the 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.

[0157] The heat conductive contact here specifically can 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 the heat of the battery cell unit 111 to the heat dissipation plate 21.

[0158] Combination Figure 1 , Figure 8 and Fig. 9 As shown, in some embodiments, a heat dissipation fin 211 is disposed 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 the heat dissipation efficiency.

[0159] Specifically, there may be at least two heat dissipation fins 211, and at least two heat dissipation fins 211 may be arranged at intervals 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.

[0160] The heat dissipation fins 211 and the heat dissipation plate 21 can be integrally formed, which is more convenient to manufacture and improves the structural strength of the entire first heat dissipation structure 2 .

[0161] Reference Figures 4 to 9 As shown, the first heat dissipation structure 2 further includes two end plates 22, which are disposed at two ends of the heat dissipation plate 21 along the first direction, and the two end plates 22 are located on the outer side of the battery cell unit 111 along the first direction. A through hole 221 is formed on the end plate 22, and the end of the heat dissipation plate 21 is penetrated through the through hole 221.

[0162] On the one hand, this arrangement 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, and the connection is 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.

[0163] Reference Figure 6 As shown, in some embodiments, the end plate 22 and the corresponding side sealing edge 113 have a spacing F along the first direction.

[0164] In this way, for example, when the battery pack is hit, the gap between the end plate 22 and the side sealing edge 113 can play a buffering role when the battery pack is hit, effectively protecting the battery cell unit 111, avoiding the battery cell unit 111 from being damaged or exploded by the impact, and improving the safety of the battery pack. On the other hand, such a setting can also prevent the side sealing edge 113 from contacting with the end plate 22 and causing a short circuit to a certain extent.

[0165] Specifically, the distance F between the end plate 22 and the corresponding side edge seal 113 along the first direction may be set to be no less than 1.5 mm.

[0166] 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.

[0167] Such an arrangement can further enhance the impact buffering effect, achieve protection for the battery cell unit 111 , and further avoid the side sealing edge 113 from contacting the end plate 22 .

[0168] Continue to refer to Figure 6 As shown, in some embodiments, a first waterproof member 5 is disposed 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 .

[0169] Exemplarily, the first waterproof member 5 may be sandwiched between the end plate 22 and the main body 311 .

[0170] 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.

[0171] 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 .

[0172] The first waterproof member 5 can be specifically a heat-conducting foam, so that the sealing between the end plate 22 and the second heat dissipation structure 3 is improved, and the thermal conductivity between the end plate 22 and the second heat dissipation structure 3 is also improved, thereby improving the overall heat dissipation effect of the battery pack.

[0173] 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 .

[0174] 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 and short circuit 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.

[0175] Exemplarily, 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 may be sandwiched between the end plate 22 and the side plate of the housing 100 .

[0176] 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.

[0177] The second waterproof member 6 can be specifically made of thermally conductive foam, which can improve the sealing between the end plate 22 and the housing 100 and the thermal conductivity between the end plate 22 and the housing 100, so that the heat is 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.

[0178] Of course, in other implementations, the first waterproof component 5 and the second waterproof component 6 may also be sealing rubber rings, etc.

[0179] Reference Figure 4 and Figure 5 As shown, in some embodiments, in each battery cell assembly 11 , a first heat conducting member 7 is disposed between at least two adjacent battery cell units 111 , and the first heat conducting member 7 is in thermal contact with the battery cell units 111 .

[0180] In this way, the heat generated by the battery cell unit 111 is transferred to the first 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 .

[0181] For example, the first heat-conducting member 7 can be a heat-conducting foam. The heat-conducting foam not only conducts heat to the battery cell 111, but also buffers the expansion of the battery cell 111 due to its own elasticity, thereby protecting the battery cell 111 to a certain extent and improving the safety of the battery pack.

[0182] In some embodiments, the compression amount a of the thermally conductive foam may be set to: 20%≤a≤80%. Exemplarily, the compression amount a may be 20%, 30%, 40%, 50%, 60%, 70%, or 80%.

[0183] By setting the compression amount of the thermally conductive foam within the above range to ensure the deformability of the first thermally conductive member 7, the thermally conductive foam can better match the gap between adjacent battery cells 111 and better fit the battery cells 111, thereby further improving the heat dissipation effect.

[0184] In a specific implementation, if the thickness of the first heat-conducting member 7 is set too small, the heat-conducting effect will be affected. However, if the thickness of the first heat-conducting member 7 is set too thick, the thickness of the entire battery cell assembly 11 will be increased, thereby causing the thickness of the battery pack to be too large. Based on this, refer to Figure 5 As shown, in some embodiments, the thickness b of the first heat conducting member 7 along the second direction can specifically satisfy: 0.7 mm≤b≤2 mm.

[0185] 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.

[0186] By setting the thickness of the first 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.

[0187] Of course, in other implementations, the first heat-conducting member 7 may also be a heat-conducting colloid or the like.

[0188] In some embodiments, at least two first heat-conducting members 7 are disposed between two adjacent battery core units 111 , and the at least two first heat-conducting members 7 are arranged at intervals between two adjacent battery core units 111 .

[0189] This further increases the contact area between the battery cell unit 111 and the first heat conducting member 7 , further improving the heat dissipation effect.

[0190] In a specific implementation, at least two first 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 first heat conducting members 7 are arranged between two adjacent battery core units 111 along the second direction.

[0191] 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 first heat conducting member 7 is disposed between another two adjacent battery cell units 111 .

[0192] Such an arrangement improves the overall heat dissipation effect of the battery cell assembly 11 , wherein the battery cell unit 111 located in the middle can achieve heat exchange not only with the first heat dissipation structure 2 , but also with the first heat conducting member 7 , further improving the heat dissipation efficiency.

[0193] For example, for any battery core assembly 11 , along the second direction, the first heat dissipation structures 2 and the first heat conducting members 7 may be alternately arranged.

[0194] For example, when the first heat-conducting member 7 is a heat-conducting foam, the above arrangement can not only improve the heat dissipation effect, but also play a role of expansion buffer to a certain extent, and play a certain protective role for the battery cell unit 111 and the first heat dissipation structure 2.

[0195] Reference Fig.10 As shown, in some embodiments, a second heat conducting member 8 is disposed on the outer surface of the outermost battery cell unit 111 along the second direction.

[0196] In this way, the heat of the outermost battery cell unit 111 can be transferred to the second heat-conducting member 8 , further improving the heat dissipation performance of the outermost battery cell unit 111 .

[0197] In some embodiments, the second 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 away from the battery cell unit 111 .

[0198] 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.

[0199] In some embodiments, the projection area of ​​the second 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 .

[0200] In this way, the contact area between the battery cell unit 111 and the second 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 .

[0201] Of course, in other implementations, the second heat-conducting member 8 may also be a heat-conducting colloid or the like.

[0202] An embodiment of the present invention further provides a battery pack system, including a battery pack.

[0203] 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, which will not be described one by one here, and the details can be referred to the description of the above embodiment.

[0204] The battery pack system may further include an air cooling device, and details may refer to the description of the above embodiment.

[0205] 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, an unmanned aerial vehicle, etc.

[0206] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0207] In this article, 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 such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0208] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: It comprises a battery module (1), a first heat dissipation structure (2) and a second heat dissipation structure (3); 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 at least two of the battery cell units (111) are arranged along a second direction; In each of the battery cell assemblies (11), the first heat dissipation structure (2) is arranged 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; The second heat dissipation structure (3) is arranged between two adjacent battery core assemblies (11), and the second heat dissipation structure (3) has a second heat dissipation channel (30) communicating with the outside; the first heat dissipation channel (20) and the second heat dissipation channel (30) are connected; The second heat dissipation structure (3) comprises two brackets (31), the two brackets (31) 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 respectively connected to the first heat dissipation structure (2) in the corresponding battery cell assembly (11); the two brackets (31) together define the second heat dissipation channel (30).

2. The battery pack according to claim 1, characterized in that: The bracket (31) is provided with a ventilation hole (310); One end of the first heat dissipation channel (20) is in communication with the outside, the other end of the first heat dissipation channel (20) is in communication with the vent (310), and the vent (310) is in communication with the second heat dissipation channel (30).

3. The battery pack according to claim 1, characterized in that: The battery pack further comprises a circuit board (4), wherein the circuit board (4) is located on one side of the battery module (1) along the third direction; A glue potting cavity (316) opening toward the circuit board (4) is provided on a side of the bracket (31) facing the circuit board (4), and a glue potting hole (315) communicating with the glue potting cavity (316) is provided on the bracket (31).

4. The battery pack according to claim 3, characterized in that: The bracket (31) comprises a main body portion (311) and a first splicing portion (312); the first splicing portion (312) is arranged on one side of the main body portion (311) along the first direction; The first joint portion (312) comprises an inclined wall (313) and an end wall (314); one end of the inclined wall (313) is connected to the main body (311); the other end of the inclined wall (313) extends obliquely in a direction away from the main body (311); and the end wall (314) is connected between the other end of the inclined wall (313) and the main body (311); The inclined wall (313), the end wall (314) and the main body (311) together define the glue pouring cavity (316), and the glue pouring hole (315) is provided on the end wall (314); The inclined walls (313) of the two brackets (31) are fitted together, and along the second direction, the end walls (314) of the two brackets (31) are arranged opposite to each other.

5. The battery pack according to claim 1, characterized in that: The bracket (31) comprises a main body portion (311) and a first splicing portion (312); the first splicing portion (312) is arranged on one side of the main body portion (311) along the first direction; The first joint portion (312) comprises an inclined wall (313) and an end wall (314); one end of the inclined wall (313) is connected to the main body (311); the other end of the inclined wall (313) extends obliquely in a direction away from the main body (311); and 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 arranged in close contact with each other, and along the second direction, the end walls (314) of the two brackets (31) are arranged opposite to each other.

6. The battery pack according to claim 5, characterized in that: The main body (311) is connected to the first heat dissipation structure (2); And / or, a vent (310) is provided on the main body (311), one end of the first heat dissipation channel (20) is in communication with the outside, the other end of the first heat dissipation channel (20) is in communication with the vent (310), and the vent (310) is in communication with the second heat dissipation channel (30); And / or, the main body (311) is a plate-shaped structure.

7. The battery pack according to claim 5, characterized in that: The bracket (31) comprises two first splicing portions (312), and the two first splicing portions (312) are arranged at two ends of the main body (311) along the third direction; The inclined walls (313) of the two first joint portions (312) intersect in their projections along the third direction.

8. The battery pack according to claim 7, characterized in that: The bracket (31) further comprises a second splicing portion (317), wherein 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); the second splicing portions (317) of the two brackets (31) are arranged to fit together.

9. The battery pack according to claim 1, characterized in that: The bracket (31) is provided with a first clamping portion (32) and a second clamping portion (33), and the first clamping portion (32) and the second clamping portion (33) are arranged at intervals on the bracket (31); The first engaging portion (32) on one of the brackets (31) corresponds one to one with the second engaging portion (33) on the other of the brackets (31) and is matched and engaged.

10. The battery pack according to claim 9, characterized in that: One of the first clamping portion (32) and the second clamping portion (33) is a buckle, and the other of the first clamping portion (32) and the second clamping portion (33) is a clamping hole that matches and engages with the buckle; And / or, 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 inserted into; the extension arm (34) on one of the brackets (31) is matched and connected with the positioning groove (35) on another of the brackets (31), the first clamping portion (32) is provided on the extension arm (34), and the second clamping portion (33) is provided in the positioning groove (35); And / or, there are at least two first engaging portions (32) and at least two second engaging portions (33); And / or, the first clamping portion (32), the second clamping portion (33) and the bracket (31) are integrally formed.

11. The battery pack according to claim 1, characterized in that: The first heat dissipation structure (2) comprises a hollow heat dissipation plate (21), the heat dissipation plate (21) being 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).

12. The battery pack according to claim 11, characterized in that: The heat dissipation plate (21) is in thermal contact with the outer surface of the battery cell unit (111); And / or, a heat dissipation fin (211) is 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.

13. The battery pack according to claim 11, characterized in that: The first heat dissipation structure (2) further comprises two end plates (22), the two end plates (22) being 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; The end plate (22) is provided with a through hole (221), and the end of the heat dissipation plate (21) is inserted into the through hole (221).

14. The battery pack according to claim 13, 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 two sides of the battery cell shell (112) along the first direction; The end plate (22) and the corresponding side edge seal (113) have a spacing along the first direction, and the spacing is not less than 1.5 mm; And / or, a first waterproof member (5) is provided between the end plate (22) at one end of the heat dissipation plate member (21) close to the second heat dissipation structure (3) and the second heat dissipation structure (3); And / or, the battery pack comprises a shell (100), the battery module (1), the first heat dissipation structure (2) and the second heat dissipation structure (3) are located in the shell (100), and a second waterproof member (6) is provided between the end plate (22) at one end of the heat dissipation plate (21) away from the second heat dissipation structure (3) and the shell (100).

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

16. The battery pack according to claim 15, characterized in that: The battery cell assembly (11) comprises at least three battery cell units (111), wherein the first heat dissipation structure (2) is arranged between two adjacent battery cell units (111), and wherein the first heat conducting member (7) is arranged between another two adjacent battery cell units (111); and / or, at least two of the first heat conducting members (7) are arranged between two adjacent battery core units (111), and at least two of the first heat conducting members (7) are arranged at intervals between the two adjacent battery core units (111); And / or, the first 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 first heat conducting member (7) along the second direction satisfies: 0.7 mm ≤ b ≤ 2 mm.

17. The battery pack according to claim 1, characterized in that: A second heat conducting member (8) is provided on the outer surface of the outermost battery core unit (111) along the second direction.

18. The battery pack according to claim 17, characterized in that: The second 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); And / or, the projection area of ​​the second 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).

19. The battery pack according to any one of claims 1 to 18, characterized in that: The battery pack also includes a housing (100); The battery module (1), the first heat dissipation structure (2) and the second heat dissipation structure (3) are located inside the housing (100); A first ventilation hole (108) is provided at a position of the housing (100) corresponding to the first heat dissipation channel (20), and a second ventilation hole (109) is provided at a position of the housing (100) corresponding to the second heat dissipation channel (30).

20. A battery pack system, characterized in that: Comprising a battery pack as claimed in any one of claims 1 to 19.

21. The battery pack system according to claim 20, characterized in that: The battery pack system also includes an air cooling device; The air cooling device is arranged corresponding to the first heat dissipation channel (20); and / or the air cooling device is arranged corresponding to the second heat dissipation channel (30).

22. An electrical equipment, characterized in that: Includes a battery pack as described in any one of claims 1 to 19, or includes a battery pack system as described in claim 20 or 21.

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