Heat dissipation bracket, battery module and battery pack

Abstract

The present invention provides a heat dissipation bracket, a battery module and a battery pack. The battery module includes a connecting piece. The heat dissipation bracket includes a heat dissipation plate, the heat dissipation plate includes a heat dissipation portion and a mounting portion, the heat dissipation portion and the mounting portion are arranged side by side along the width direction of the heat dissipation plate and are fixedly connected, the heat dissipation portion is provided with a heat dissipation channel, the heat dissipation channel includes a water inlet and a water outlet, the water inlet and the water outlet are respectively located at both ends of the heat dissipation channel; the mounting portion is used to install the connecting piece. The heat dissipation bracket provided by the present invention can achieve heat dissipation of the connecting piece, thereby solving the technical problem of low heat dissipation efficiency of the battery connecting piece in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a heat dissipation bracket, a battery module and a battery pack. Background Art

[0002] As an important energy storage unit, power batteries are widely used in new energy vehicles and other fields. In order to provide sufficient power and voltage, power batteries are generally equipped with more than two battery modules, and each battery module can contain multiple single cells. Multiple battery cells are connected in series or in parallel through connecting plates. When the battery is fast charged, the connecting plate needs to withstand a continuous large current, which will cause the connecting plate to generate a large amount of heat and the temperature to rise rapidly. Most of the connecting plates in the prior art use natural cooling to dissipate heat. This heat dissipation method has low heat dissipation efficiency and will cause the temperature of the connecting plate to be too high, which will affect the performance and life of the battery and may even cause safety accidents. Summary of the invention

[0003] The present invention provides a heat dissipation bracket, a battery module and a battery pack to solve the technical problem of low heat dissipation efficiency of a battery connecting piece in the prior art.

[0004] In order to solve the above problems, in the first aspect, the present invention provides a heat dissipation bracket, which is applied to a battery module. The battery module includes a connecting piece. The heat dissipation bracket includes a heat dissipation plate, the heat dissipation plate includes a heat dissipation portion and a mounting portion, the heat dissipation portion and the mounting portion are arranged side by side along the width direction of the heat dissipation plate and are fixedly connected, the heat dissipation portion is provided with a heat dissipation channel, the heat dissipation channel includes a water inlet and a water outlet, the water inlet and the water outlet are respectively located at two ends of the heat dissipation channel; the mounting portion is used to install the connecting piece.

[0005] In a possible embodiment, the heat sink includes a plurality of sub-heat sinks, which are arranged side by side and fixedly connected along the length direction of the heat sink, and the heat dissipation channel includes a plurality of sub-heat dissipation channels, each of the sub-heat sinks is provided with a sub-heat dissipation channel, and the plurality of sub-heat dissipation channels are arranged at intervals.

[0006] In a possible implementation, the heat dissipation support further includes a coolant, the coolant is located in the heat dissipation channel, and the coolant enters the heat dissipation channel through the water inlet and flows out of the heat dissipation channel through the water outlet.

[0007] In a possible embodiment, the heat sink includes a first side surface, the first side surface is located on a side of the heat dissipation portion away from the mounting portion, the water inlet and the water outlet are both provided on the first side surface and penetrate the first side surface, and the water inlet and the water outlet are spaced apart along the length direction of the first side surface.

[0008] In a possible implementation, the mounting portion is provided with a plurality of mounting holes, the plurality of mounting holes are arranged side by side and at intervals along the length direction of the heat dissipation bracket, and the plurality of mounting holes are used to pass through the poles of the battery module.

[0009] In a possible implementation manner, the heat sink is further provided with an auxiliary heat dissipation channel, the auxiliary heat dissipation channel is provided at the mounting portion and is located between any two adjacent mounting holes, and the auxiliary heat dissipation channel is communicated with the heat dissipation channel.

[0010] In a possible implementation manner, the heat sink is made of plastic.

[0011] In a possible implementation manner, the heat transfer coefficient of the heat dissipation bracket is 200 W / m 2 K~2000W / m 2 K.

[0012] In a possible implementation, the heat dissipation bracket further includes a water supply component, the water supply component is provided with a water supply channel, the water supply component is fixedly connected to the heat dissipation plate, and the water inlet and the water outlet are both connected to the water supply channel.

[0013] In a possible implementation, the water supply channel includes a water inlet channel and a drainage channel, the water inlet channel and the drainage channel are arranged side by side and at intervals along the width direction of the water supply member, the water inlet is connected to the water inlet channel, and the water outlet is connected to the drainage channel.

[0014] In a second aspect, the present invention provides a battery module, comprising a plurality of battery cells, a connecting plate and the above-mentioned heat dissipation bracket, wherein the plurality of battery cells are arranged side by side, the heat dissipation bracket is installed on the battery cells, the connecting plate is installed on the installation portion, and is electrically connected to the poles of the plurality of battery cells.

[0015] In a third aspect, the present invention provides a battery pack comprising the above-mentioned battery module.

[0016] In a fourth aspect, the present invention provides a battery pack, comprising a liquid cooling plate and the above-mentioned heat dissipation bracket, wherein the liquid cooling plate is provided with a flow channel, and the water inlet and the water outlet are both connected to the flow channel.

[0017] In summary, the present invention dissipates heat to the heat sink by providing a heat dissipation channel on the heat sink, and allows the coolant to flow in the heat dissipation channel, thereby dissipating the heat transmitted from the connecting plate and the pole to the heat sink, dissipating the heat of the connecting plate and the pole, and controlling the temperature of the connecting plate, thereby improving the heat dissipation performance of the battery module, avoiding excessive temperatures of the connecting plate and the pole that affect the performance and life of the battery module, and even causing safety accidents, and at the same time, meeting the high-power, short-time fast charging requirements of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the background technology, the drawings required for use in the embodiments of the present invention or the background technology will be described below.

[0019] Figure 1 is a schematic diagram of the exploded structure of the battery pack provided by the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the tray in the battery pack shown in the figure;

[0021] Figure 3 yes Figure 1 A schematic diagram of the exploded structure of the battery module in the battery pack shown;

[0022] Figure 4 is a schematic structural diagram of a heat dissipation bracket provided by a first embodiment of the present invention;

[0023] Figure 5 yes Figure 4 A schematic cross-sectional structure diagram of the heat dissipation bracket shown;

[0024] Figure 6 yes Figure 4 A partial structural schematic diagram of the heat dissipation bracket shown;

[0025] Figure 7 yes Figure 4 A schematic diagram of a partial cross-sectional structure of the heat dissipation bracket shown;

[0026] Figure 8 is a schematic structural diagram of a heat dissipation bracket provided by a second embodiment of the present invention;

[0027] Fig. 9 is a partial structural schematic diagram of a heat dissipation bracket provided in a third embodiment of the present invention;

[0028] Fig.10 is a schematic structural diagram of a heat dissipation bracket provided by a fourth embodiment of the present invention;

[0029] Fig.11 yes Fig.10 A schematic cross-sectional structure diagram of the heat dissipation bracket shown;

[0030] Fig.12 yes Fig.10 A schematic structural diagram of the water supply component in the heat dissipation bracket is shown. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present invention.

[0032] See also Figure 1 , Figure 1It is a schematic diagram of the exploded structure of the battery pack 200 provided by the present invention.

[0033] The battery pack 200 includes but is not limited to lithium-ion secondary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries. In this embodiment, there is no specific restriction on the type of the battery pack 200. The battery pack 200 can be applied to electrical equipment to provide power and power for the electrical equipment. Electrical equipment includes but is not limited to vehicles, ships, spacecraft, electric toys and electric tools. The vehicle can be a new energy vehicle, a pure electric vehicle, a hybrid vehicle or an extended-range vehicle. The embodiment of the present invention does not specifically limit electrical equipment.

[0034] The battery pack 200 in this embodiment is of a large module type. In other embodiments, the battery pack 200 may also be of a CTB (Cell To Body) type. Among them, the large module type battery pack 200 is composed of a plurality of battery modules 100, and the battery module 100 is composed of a plurality of battery cells 20 connected in series or in parallel. CTB refers to the technology of directly installing the battery cells 20 on the chassis of the vehicle, integrating the battery into the overall design of the vehicle body, and integrating the battery body.

[0035] For ease of description, a large module type battery pack 200 is used as an example for description. At the same time, for ease of description, the length direction of the battery pack 200 is defined as the X direction, the width direction is defined as the Y direction, and the height direction is defined as the Z direction. The X direction, the Y direction, and the Z direction are perpendicular to each other.

[0036] Please also read Figure 1 and Figure 2 , Figure 2 yes Figure 1 A schematic structural diagram of the tray 40 in the battery pack 200 is shown.

[0037] The battery pack 200 includes a tray 40, a battery module 100, a protective plate 50, a sealing cover 60, a distribution box 51 and a control system 52. In this embodiment, the material of the tray 40 is aluminum alloy. In other embodiments, the tray 40 may also be other metal materials. The tray 40 includes a first bottom plate 41, a side beam 42, a first middle beam 43 and a second middle beam 44. The first bottom plate 41 is rectangular. In this embodiment, the first bottom plate 41 is a liquid cooling plate. That is, a flow channel is provided inside the first bottom plate 41. The water inlet 401 and the water outlet 402 of the flow channel are provided on the side of the first bottom plate 41. The coolant enters the flow channel located on the first bottom plate 41 from the water inlet 401, and then flows out from the water outlet 402, thereby achieving heat dissipation of the first bottom plate 41.

[0038] In this embodiment, the side beam 42 is a return frame formed by welding an extruded profile. The side beam 42 includes a first expansion beam 421, a second expansion beam 422, a first longitudinal beam 423 and a second longitudinal beam 424. The first expansion beam 421 and the second expansion beam 422 are arranged opposite to each other and parallel to the Y direction. The first longitudinal beam 423 and the second longitudinal beam 424 are arranged opposite to each other and parallel to the X direction, and the first longitudinal beam 423 and the second longitudinal beam 424 are connected between the first expansion beam 421 and the second expansion beam 422. The side beam 42 is vertically connected to the first bottom plate 41, and is enclosed with the first bottom plate 41 to form a receiving cavity 45. In this embodiment, the side beam 42 and the first bottom plate 41 are fixedly connected by friction stir welding. In some other embodiments, the side beam 42 and the first bottom plate 41 can also be fixedly connected by a sealing ring and a mechanical fastener. The mechanical fastener can specifically be a rivet or a bolt. Alternatively, the side beam 42 and the first bottom plate 41 can also be fixedly connected by bonding.

[0039] The first center beam 43 is connected between the first expansion beam 421 and the second expansion beam 422, and is parallel to and spaced apart from the first longitudinal beam 423 and the second longitudinal beam 424. That is, the first center beam 43 is parallel to the X direction. The second center beam 44 is connected between the first longitudinal beam 423 and the second longitudinal beam 424, and is parallel to and spaced apart from the first expansion beam 421 and the second expansion beam 422, and the second center beam 44 is vertically arranged with the first center beam 43. That is, the second center beam 44 is parallel to the Y direction. The first center beam 43 and the second center beam 44 divide the receiving cavity 45 into four sub-receiving cavities 451. Each sub-receiving cavity 451 is used to receive the battery module 100.

[0040] The tray 40 further includes an extension body 46. The extension body 46 is disposed on the side of the tray 40 and is fixedly connected to the second expansion beam 422. The extension body 46 and the second expansion beam 422 enclose a power distribution accommodating cavity 47. The power distribution box 51 and the control system 52 are installed in the power distribution accommodating cavity 47 and are fixedly connected to the tray 40.

[0041] In this embodiment, there are four battery modules 100. One battery module 100 is contained in a sub-containing cavity 451. A thermally conductive structural adhesive is provided between the battery module 100 and the first bottom plate 41. The thermally conductive structural adhesive is bonded between the surface of the first bottom plate 41 and the battery module 100 to fix the battery module 100 to the first bottom plate 41. At the same time, the heat of the battery module 100 can be transferred to the first bottom plate 41 through the thermally conductive structural adhesive to achieve heat dissipation of the battery module 100. In one embodiment, a thermally conductive structural adhesive may also be provided between the battery module 100 and the side beam 42 to enhance the stability of the connection between the battery module 100 and the tray 40.

[0042] The distribution box 51 and the control system 52 are both installed in the distribution accommodating cavity 47 and fixedly connected to the tray 40. The distribution box 51 is electrically connected to the battery module 100. The distribution box 51 is used to convert and distribute the power of the battery pack 200, and transmit the power of the battery pack 200 to the electrical components of the whole vehicle. The control system 52 is electrically connected to the distribution box 51, and is also electrically connected to the electrical components of the whole vehicle. The control system 52 is used to monitor the status of the battery pack 200, and control the working status of the distribution box 51 according to the status of the battery pack 200. In addition, the control system 52 is also used to receive instructions from the whole vehicle, and control the working status of the distribution box 51 and the battery pack 200 through the instructions, such as the output voltage of the battery pack 200, the charging and discharging of the battery pack 200, the power distribution of the battery pack 200, etc.

[0043] The sealing cover 60 covers the open side of the tray 40 and is sealed with the tray 40 to close the receiving cavity 45. A cooling channel is provided in the sealing cover 60, and a coolant is provided in the cooling channel. That is, the sealing cover 60 can be designed as a liquid cooling plate structure. While realizing the sealing function, the sealing cover 60 can also dissipate heat for the battery module 100, thereby improving the heat dissipation performance of the battery pack 200, and further improving the fast charging capability of the battery pack 200.

[0044] The guard plate 50 is located on the outside of the tray 40 and is fixedly connected to the first bottom plate 41, and the guard plate 50 is located on the side of the tray 40 away from the sealing cover 60. In this embodiment, the guard plate 50 is fixedly connected to the tray 40 by mechanical fasteners. Specifically, the mechanical fasteners may be rivets or bolts, etc. In other embodiments, the guard plate 50 may also be fixedly connected to the tray 40 by structural adhesive. The guard plate 50 protects the tray 40 and the battery module 100 mounted on the tray 40, and can prevent the battery pack 200 from being damaged by external forces.

[0045] In one embodiment, the battery pack 200 further includes a liquid cooling plate (not shown). A cooling channel is provided in the liquid cooling plate, and a coolant is provided in the cooling channel. The liquid cooling plate is provided between the battery module 100 and the sealing cover 60, and the liquid cooling plate is fixedly connected to the battery module 100 through the thermal conductive adhesive 30 in the battery module 100. The heat generated by the battery module 100 can be transferred to the liquid cooling plate through the thermal conductive adhesive 30, and then transferred to the outside through the sealing cover 60.

[0046] See also Figure 3 , Figure 3 yes Figure 1 A schematic diagram of the exploded structure of the battery module 100 in the battery pack 200 is shown.

[0047] The battery module 100 includes a battery cell 20, a thermally conductive adhesive 30, a first thermal insulation member 31, a second thermal insulation member 32, a protective cover 33, a circuit board 34, a first heat dissipation bracket 10a, a second heat dissipation bracket (not shown), a first connecting piece 35a and a second connecting piece (not shown).

[0048] In this embodiment, there are multiple battery cells 20. Each battery cell 20 includes a battery body 21, a positive electrode column 22 and a negative electrode column 23. The positive electrode column 22 and the negative electrode column 23 are respectively located on opposite sides of the battery body 21 and are electrically connected to the battery body 21. The length direction of the battery cell 20 is parallel to the Y direction. Multiple battery cells 20 are arranged side by side along the X direction. Moreover, in this embodiment, on the same side of the battery cell 20, the polarity of the electrode column of any battery cell 20 is opposite to the polarity of the electrode column of the adjacent battery cell 20. That is to say, on the same side of the battery module 100, the positive electrode column 22 and the negative electrode column 23 of multiple battery cells 20 are staggered. For example, when there are four battery cells 20, the positive electrode column 22 of the first battery cell 20, the negative electrode column 23 of the second battery cell 20, the positive electrode column 22 of the third battery cell 20 and the negative electrode column 23 of the fourth battery cell 20 are located on the same side, and the negative electrode column 23 of the first battery cell 20, the positive electrode column 22 of the second battery cell 20, the negative electrode column 23 of the third battery cell 20 and the positive electrode column 22 of the fourth battery cell 20 are located on the other side.

[0049] In this embodiment, the first thermal insulation member 31 is aerogel. The thickness of the first thermal insulation member 31 is 0.5 mm to 4 mm. Specifically, the thickness of the first thermal insulation member 31 can be adjusted according to the system, parameters, thermal diffusion and other requirements of the battery cell 20. In other embodiments, the first thermal insulation member 31 can also be a sponge or other porous materials. There are multiple first thermal insulation members 31. A first thermal insulation member 31 is provided between each two adjacent battery cells 20. In this embodiment, by providing the first thermal insulation member 31 between two adjacent battery cells 20, it can play a role of heat insulation, and at the same time it can also absorb the expansion of the battery cell 20 and play a buffering and protective role for the battery cell 20.

[0050] The first heat dissipation bracket 10a and the second heat dissipation bracket are respectively arranged on opposite sides of the length direction of the battery cell 20, and are fixedly connected to the battery cell 20. The connecting piece 35 includes a first connecting piece 35a and a second connecting piece. The first connecting piece 35a and the second connecting piece are both made of metal. The first connecting piece 35a is installed on the first heat dissipation bracket 10a and is electrically connected to the positive electrode column 22 or the negative electrode column 23 of the battery cell 20. The second connecting piece is installed on the second heat dissipation bracket and is electrically connected to the positive electrode column 22 or the negative electrode column 23 of the battery cell 20. The first connecting piece 35a and the second connecting piece can be fixedly connected and electrically connected to the positive electrode column 22 or the negative electrode column 23 of the battery cell 20 by laser welding, so that multiple battery cells 20 are connected in series. In other embodiments, multiple battery cells 20 can also be connected in parallel through the first connecting piece 35a and the second connecting piece, or a mixed connection of series and parallel.

[0051] In this embodiment, the circuit board 34 is a flexible printed circuit board (FPC). In other embodiments, the circuit board 34 may also be a printed circuit board (PCB). The circuit board 34 is mounted on the first connecting piece 35a and is electrically connected to the first connecting piece 35a. In addition, the first circuit board 34 is also electrically connected to the control system 52. The circuit board 34 is used to monitor and measure the voltage and temperature of the battery module 100, and the control system 52 of the battery pack 200 transmits information.

[0052] The protective cover 33 includes a first protective cover 33a and a second protective cover (not shown). The first protective cover 33a and the second protective cover are respectively located on opposite sides of the battery module 100 in the Y direction. The first protective cover 33a is buckled on the side of the first heat dissipation bracket 10a facing away from the battery cell 20, and is fixedly connected to the first heat dissipation bracket 10a, and the first connecting piece 35a and the circuit board 34 are located between the first heat dissipation bracket 10a and the first protective cover 33a. The second protective cover is buckled on the side of the second heat dissipation bracket facing away from the battery cell 20, and is fixedly connected to the second heat dissipation bracket, and the second connecting piece is located between the second heat dissipation bracket and the second protective cover. The first protective cover 33a protects the first connecting piece 35a and the battery cell 20, and the second protective cover protects the second connecting piece and the battery cell 20. At the same time, when the battery module 100 is installed on the tray 40, the first protective cover 33a and the second protective cover insulate the battery module 100 from the tray 40, thereby preventing the battery module 100 from leaking electricity.

[0053] The second thermal insulation member 32 is an insulating thermal insulation board. The second thermal insulation member 32 is disposed on the outer side of the battery cells 20 located at the two end positions among the multiple battery cells 20, that is, the second thermal insulation member 32 is located at the opposite sides of the battery module 100. When the battery module 100 is installed on the tray 40, the second thermal insulation member 32 is located between the outermost battery cells 20 and the tray 40, so that the battery module 100 and the tray 40 can be insulated, and the heat of the battery module 100 can be prevented from being transferred to the tray 40, causing the temperature of the tray 40 to be too high.

[0054] The first heat dissipation bracket 10a and the second heat dissipation bracket may have the same structure or may have different structures. For the convenience of description, the first heat dissipation bracket 10a or the second heat dissipation bracket may be referred to as the heat dissipation bracket 10. When the first heat dissipation bracket 10a and the second heat dissipation bracket have different structures, one of the first heat dissipation bracket 10a and the second heat dissipation bracket is the heat dissipation bracket 10. When the first heat dissipation bracket 10a and the second heat dissipation bracket have the same structure, the first heat dissipation bracket 10a and the second heat dissipation bracket are both the heat dissipation bracket 10.

[0055] In this embodiment, the first heat dissipation bracket 10a and the second heat dissipation bracket have the same structure, and the heat dissipation bracket 10 is taken as a specific embodiment for description below.

[0056] See also Figure 4 and Figure 5 , Figure 4 is a schematic structural diagram of a heat dissipation bracket 10 provided in a first embodiment of the present invention, Figure 5 yes Figure 4 A schematic cross-sectional structure diagram of the heat dissipation bracket 10 is shown.

[0057] The heat dissipation support 10 includes a heat dissipation plate 11. It can be understood that the heat dissipation plate 11 in this embodiment is the heat dissipation support 10. The heat dissipation plate 11 includes a first side surface 111, a second side surface 112, a first surface 113 and a second surface 114. The first side surface 111 and the second side surface 112 are arranged opposite to each other and are respectively located on opposite sides of the width direction (Z direction) of the heat dissipation plate 11. The first surface 113 and the second surface 114 are arranged opposite to each other and are respectively located on opposite sides of the thickness direction (Y direction) of the heat dissipation plate 11. The heat dissipation plate 11 also includes a heat dissipation portion 115 and a mounting portion 116. The heat dissipation portion 115 and the mounting portion 116 are arranged side by side and fixedly connected along the width direction (Z direction) of the heat dissipation plate 11. Among them, the first side surface 111 is located on the side of the heat dissipation portion 115 away from the mounting portion 116, and the second side surface 112 is located on the side of the mounting portion 116 away from the heat dissipation portion 115.

[0058] The heat dissipation portion 115 is provided with a heat dissipation channel 13, and the heat dissipation channel 13 includes a water inlet 131 and a water outlet 132, and the water inlet 131 and the water outlet 132 are respectively located at both ends of the heat dissipation channel 13. In this embodiment, the water inlet 131 and the water outlet 132 are fixedly connected to the sealing cover 60 and communicate with the flow channel in the sealing cover 60. The coolant in the sealing cover 60 flows into the heat dissipation channel 13 through the water inlet 131, and flows back to the sealing cover 60 through the water outlet 132, thereby realizing the circulation of the coolant.

[0059] In other embodiments, when the battery pack 200 includes a liquid cooling plate, the water inlet 131 and the water outlet 132 may also be connected to the flow channel in the liquid cooling plate. The coolant in the liquid cooling plate flows into the heat dissipation flow channel 13 through the water inlet 131, and flows back to the liquid cooling plate through the water outlet 132, thereby realizing the circulation of the coolant.

[0060] The mounting portion 116 is used to mount the connecting piece 35. The heat generated by the connecting piece 35 and the pole of the battery cell 20 is first transmitted to the heat sink 11, so that the temperature of the heat sink 11 increases. The coolant enters the heat dissipation channel 13 through the water inlet 131, exchanges heat with the heat sink 11, absorbs the heat transmitted from the connecting piece 35 and the pole of the battery cell 20 to the heat sink 11, and reduces the temperature of the heat sink 11. Then the coolant flows out from the water outlet 132, thereby achieving heat dissipation of the connecting piece 35 and the pole of the battery cell 20.

[0061] In this embodiment, by providing a heat dissipation channel 13 in the heat dissipation portion 115 of the heat dissipation plate 11, heat dissipation of the connecting plate 35 and the poles of the battery cell 20 can be achieved, and the temperature of the connecting plate 35 can be controlled, thereby improving the heat dissipation performance of the battery module 100, avoiding excessive temperatures of the connecting plate 35 and the poles that affect the performance and life of the battery module 100, and even causing safety accidents. At the same time, the high-power, short-time fast charging requirements of the battery module 100 can also be met.

[0062] In this embodiment, the heat sink 11 is a plastic part. The material of the heat sink 11 can be polypropylene (PP), polyethylene (PE) or polyvinyl chloride (PVC), etc., and there is no specific restriction on the material of the heat sink 11. The heat sink 11 can be prepared by injection molding or other molding methods.

[0063] The heat sink 11 is a long strip-shaped plate-like structure. In the present embodiment, the heat sink 11 includes a plurality of sub-heat sinks 12. The structure of each sub-heat sink 12 is substantially the same. In the present embodiment, the plurality of sub-heat sinks 12 are arranged in sequence along the X direction, and two adjacent sub-heat sinks 12 are fixedly connected by snapping. In some other embodiments, two adjacent sub-heat sinks 12 may also be fixedly connected by bonding or melting, or may be fixedly connected by mechanical fasteners, such as bolts or rivets.

[0064] See also Figure 6 , Figure 6 yes Figure 4 A partial structural schematic diagram of the heat dissipation bracket 10 is shown.

[0065] Each sub-heat sink 12 includes a second bottom plate 121, a first side plate 122, a second side plate 123, a third side plate 124, a first partition 125, a second partition 126, and a third partition 127. The second bottom plate 121 includes a first sub-side surface 1211, a second sub-side surface 1212, a third sub-side surface 1213, a fourth sub-side surface 1214, a first sub-surface 1215, and a second sub-surface 1216. The first sub-side surface 1211 and the second sub-side surface 1212 are arranged opposite to each other and are respectively located on opposite sides of the width direction (Z direction) of the sub-heat sink 12. The third sub-side surface 1213 and the fourth sub-side surface 1214 are arranged opposite to each other and are respectively located on opposite sides of the width direction (X direction) of the sub-heat sink 12. The first sub-surface 1215 and the second sub-surface 1216 are arranged opposite to each other and are respectively located on opposite sides of the thickness direction (Y direction) of the sub-heat sink 12. The second bottom plate 121 also includes a sub-mounting portion 1217 and a sub-heat sink portion 1218. The sub-mounting portion 1217 and the sub-heat dissipation portion 1218 are arranged side by side and fixedly connected along the width direction of the sub-heat dissipation plate 12. The first sub-side surface 1211 is located on the side of the sub-heat dissipation portion 1218 away from the sub-mounting portion 1217, and the second sub-side surface 1212 is located on the side of the sub-mounting portion 1217 away from the sub-heat dissipation portion 1218.

[0066] Each sub-mounting portion 1217 is provided with a mounting hole 128 and an auxiliary mounting hole 129. There are multiple mounting holes 128 and auxiliary mounting holes 129, and they penetrate the first sub-surface 1215 and the second sub-surface 1216. Multiple mounting holes 128 are arranged side by side and at intervals along the X direction. Multiple auxiliary mounting holes 129 are arranged side by side and at intervals along the X direction. The auxiliary mounting holes 129 and the mounting holes 128 are arranged at intervals along the Z direction, and the auxiliary mounting holes 129 are located between the mounting holes 128 and the second sub-side surface 1212. Multiple mounting holes 128 are used to install the poles of the battery cell 20, and multiple auxiliary mounting holes 129 are used to avoid the injection parts or other structural parts of the battery cell 20.

[0067] The first side plate 122 is connected to the third sub-side surface 1213, and the second side plate 123 is connected to the fourth sub-side surface 1214. The first side plate 122 and the second side plate 123 are arranged in parallel and extend in opposite directions. The first side plate 122 extends in a direction away from the second sub-surface 1216, and the second side plate 123 extends in a direction away from the first sub-surface 1215. The third side plate 124 is connected to the second sub-side surface. One end of the third side plate 124 is connected to the first side plate 122, and the third side plate 124 extends in a direction away from the second sub-surface 1216.

[0068] The first partition 125 is provided on the second sub-surface 1216 and is located between the sub-mounting portion 1217 and the sub-heat dissipation portion 1218. The first partition 125 is perpendicular to the second sub-surface 1216, and the length direction of the first partition 125 is parallel to the X direction. The second partition 126 is provided on the second sub-surface 1216 and is located between the mounting hole 128 and the auxiliary mounting hole 129. The second partition 126 is parallel to the first partition 125 and is arranged at intervals. There are multiple third partitions 127. Multiple third partitions 127 are perpendicularly provided on the second sub-surface 1216 and are perpendicularly connected between the first partition 125 and the second partition 126. In this embodiment, a third partition 127 is provided between every two mounting holes 128. That is, there are two mounting holes 128 between two adjacent third partitions 127. The second bottom plate 121, the first partition 125, the second partition 126 and the third partition 127 are enclosed to form multiple installation spaces. The installation space is used to install the connecting piece 35. Specifically, one installation space is used to install one sub-connection piece 35 in the connection piece 35 .

[0069] See also Figure 7 , Figure 7 yes Figure 4 A partial cross-sectional structural schematic diagram of the heat dissipation bracket 10 is shown.

[0070] Each sub-heat dissipation portion 1218 is provided with a sub-heat dissipation channel 14. A plurality of sub-heat dissipation channels 14 together constitute the heat dissipation channel 13. The sub-heat dissipation channel 14 includes a sub-main body channel 141, a sub-water inlet channel 142 and a sub-water outlet channel 143. The sub-main body channel 141 is in the shape of an elongated strip, and the extension direction of the sub-main body channel 141 is parallel to the X direction. That is, the sub-main body channel 141 extends along the length direction of the heat dissipation plate 11. One end of the sub-water inlet channel 142 is connected and communicated with the sub-main body channel 141, and the other end extends toward the first sub-side surface 1211 and protrudes from the first sub-side surface 1211. The extension direction of the sub-water inlet channel 142 is parallel to the Z direction. That is, the extension direction of the sub-water inlet channel 142 is perpendicular to the extension direction of the sub-main body channel 141. The sub-outlet flow channel 143 and the sub-inlet flow channel 142 are located on the same side of the sub-main body flow channel 141, and the sub-outlet flow channel 143 is parallel to and spaced from the sub-inlet flow channel 142. One end of the sub-outlet flow channel 143 is connected to and communicates with the sub-main body flow channel 141, and the other end extends toward the first sub-side surface 1211 and protrudes from the first sub-side surface 1211. In this embodiment, the extension direction of the sub-outlet flow channel 143 is parallel to the Z direction, that is, perpendicular to the extension direction of the sub-main body flow channel 141.

[0071] In some other embodiments, the extension direction of the sub-body flow channel 141 may also have a small deviation from the X direction. The angle between the extension direction of the sub-inlet flow channel 142 and the extension direction of the sub-body flow channel 141 may also be an acute angle or an obtuse angle, as long as the extension direction of the sub-inlet flow channel 142 intersects with the extension direction of the sub-body flow channel 141. The angle between the extension direction of the sub-outlet flow channel 143 and the extension direction of the sub-body flow channel 141 may also be an acute angle or an obtuse angle, as long as the extension direction of the sub-outlet flow channel 143 intersects with the extension direction of the sub-body flow channel 141 and is spaced apart from the sub-inlet flow channel 142.

[0072] Please also read Figure 6In this embodiment, the sub-heat dissipation plate 12 further includes a first protrusion 101 and a second protrusion 102. A through groove is provided in the first protrusion 101 and the second protrusion 102. The first protrusion 101 and the second protrusion 102 are both provided on the first sub-side surface 1211, and the through groove of the first protrusion 101 is communicated with the sub-water inlet channel 142, and the through groove of the second protrusion 102 is communicated with the sub-water outlet channel 143. It can be understood that the through groove of the first protrusion 101 is a part of the sub-water inlet channel 142, and the opening of the through groove of the first protrusion 101 at one end away from the sub-water inlet channel 142 is the sub-water inlet 144 of the sub-heat dissipation channel 14. The through groove of the second protrusion 102 is a part of the sub-water outlet channel 143, and the opening of the through groove of the second protrusion 102 at one end away from the sub-water outlet channel 143 is the sub-water outlet 145 of the sub-heat dissipation channel 14. The first protrusion 101 and the second protrusion 102 are both used to be fixedly connected to an external water supply structure. It is understandable that the external water supply structure can be a liquid cooling plate or a sealing cover 60 provided with a flow channel.

[0073] In this embodiment, by providing the first protrusion 101 and the second protrusion 102 on the first side 111, the sub-heat dissipation channel 14 can be easily connected with the channel in the external water supply structure, thereby improving the stability and sealing of the connection between the water supply structure and the sub-heat dissipation plate 12 and reducing the process difficulty.

[0074] In other embodiments, the sub-water inlet 144 and the sub-water outlet 145 of the sub-heat dissipation channel 14 may also be directly disposed on the first sub-side surface 1211 to simplify the structure of the heat dissipation plate 11 .

[0075] Please also read Figure 4 and Figure 5 In this embodiment, there are five sub-heat sinks 12. The structures of the five sub-heat sinks 12 may be completely the same or slightly different. Specifically, the number of mounting holes 128 and the number of auxiliary mounting holes 129 of the five sub-heat sinks 12 may be slightly different. The structure of each sub-heat sink 12 may be adaptively adjusted according to the number and arrangement direction of the battery cells 20 in the battery module 100.

[0076] The first sub-side surfaces 1211 of the plurality of sub-heat sinks 12 together constitute the first side surface 111 of the heat sink 11, the second sub-side surfaces 1212 of the plurality of sub-heat sinks 12 together constitute the second side surface 112 of the heat sink 11, the first sub-surfaces 1215 of the plurality of sub-heat sinks 12 together constitute the first surface 113 of the heat sink 11, and the second sub-surfaces 1216 of the plurality of sub-heat sinks 12 together constitute the second surface 114 of the heat sink 11. The sub-heat sinks 1218 of the plurality of sub-heat sinks 12 together constitute the heat sink 115 of the heat sink 11, and the sub-mounting portions 1217 of the plurality of sub-heat sinks 12 together constitute the mounting portion 116 of the heat sink 11.

[0077] Please also read Figure 3 , the heat dissipation bracket 10 is applied to the battery module 100. The heat dissipation bracket 10 (the first heat dissipation bracket 10a) is installed on the side of the battery cell 20 and is fixedly connected to the battery cell 20. Among them, the first surface 113 faces the battery cell 20, the pole of the battery cell 20 is located in the mounting hole 128, and one pole corresponds to one mounting hole 128. The first protrusion 101 and the second protrusion 102 are fixedly connected to the external water supply structure, and the sub-heat dissipation channel 14 is connected to the channel of the external water supply structure. In this embodiment, the external water supply structure is a sealing cover 60. In other embodiments, the external water supply structure can also be a liquid cooling plate. The first connecting piece 35a is located in the installation space, and is electrically and fixedly connected to the pole, so as to realize the series or parallel connection of multiple battery cells 20. At the same time, the first connecting piece 35a is also fixedly connected to the heat dissipation plate 11 to improve the stability of the connection between the connecting piece 35 and the pole.

[0078] When current passes through the first connecting piece 35a and the pole, the first connecting piece 35a and the pole generate heat and transfer the heat to the heat sink 11. The coolant in the external water supply structure enters the corresponding sub-heat sink 14 through the sub-water inlets 144 of the multiple sub-heat sinks 14, exchanges heat with the heat sink 11, absorbs the heat transferred from the connecting piece 35 and the pole to the heat sink 11, and reduces the temperature of the heat sink 11. Then, the coolant after absorbing the heat enters the external water supply structure from the sub-water outlets 145 corresponding to the sub-heat sink 14, thereby realizing the circulation of the coolant and heat dissipation of the connecting piece 35 and the pole.

[0079] In this embodiment, by setting a plurality of sub-heat dissipation channels 14 on the heat dissipation plate 11, the cooling liquid is forced to circulate, and the connecting piece 35 and the pole are cooled by the plurality of sub-heat dissipation channels 14 at the same time, so that the temperature of the connecting piece 35 can be controlled, the heat dissipation performance of the battery module 100 can be improved, and the temperature of the connecting piece 35 and the pole can be prevented from being too high, which may affect the performance and life of the battery module 100, and even cause safety accidents. At the same time, the high-power and short-time fast charging requirements of the battery module 100 can also be met. The heat dissipation coefficient of the heat dissipation bracket 10 provided in this embodiment is 200W / m 2 K~2000W / m 2 K.

[0080] See also Figure 8 , Figure 8 1 is a schematic structural diagram of a heat dissipation bracket 10 provided in a second embodiment of the present invention.

[0081] This embodiment and Figure 4The difference between the illustrated embodiments is that the heat sink 11 in this embodiment is an integrally formed part, and the heat dissipation channel 13 is one. In this embodiment, the heat dissipation channel 13 includes a main channel 133, a water inlet channel 134, and a water outlet channel 135. The water inlet channel 134 and the water outlet channel 135 are respectively connected to the opposite ends of the main channel 133, and are vertically connected to the main channel 133, and the water inlet channel 134 and the water outlet channel 135 are both located on the same side of the main channel 133. The water inlet 131 and the water outlet 132 of the heat dissipation channel 13 are both located on the side of the heat sink 11 close to the first side 111.

[0082] The heat sink 11 is fixedly connected to the external water supply structure, and the heat dissipation channel 13 is connected to the channel in the external water supply structure. The coolant in the external water supply structure enters the water inlet channel 134 through the water inlet 131, and flows to the main flow channel 133, exchanges heat with the heat dissipation part 115 of the heat sink 11, absorbs the heat transmitted to the heat sink 11 by the connecting piece 35 and the pole, and reduces the temperature of the heat sink 11. Then, the coolant after absorbing the heat flows from the main flow channel 133 to the water outlet channel 135, and enters the external water supply structure through the water outlet 132, thereby realizing the circulation of the coolant and heat dissipation of the connecting piece 35 and the pole.

[0083] In this embodiment, the heat sink 11 is an integrally formed part, and the heat dissipation channel 13 is one, which can simplify the structure of the heat dissipation bracket 10 and save costs while ensuring the heat dissipation performance of the heat dissipation bracket 10.

[0084] See also Fig. 9 , Fig. 9 It is a partial structural diagram of a heat dissipation bracket 10 provided in the third embodiment of the present invention.

[0085] This embodiment and Figure 4 The difference of the embodiment shown is that in this embodiment, the heat sink 11 is further provided with an auxiliary flow channel 15. There are multiple auxiliary flow channels 15. An auxiliary flow channel 15 is provided between each two adjacent mounting holes 128, each auxiliary flow channel 15 is connected to the sub-heat dissipation flow channel 14, and the ends of the multiple auxiliary flow channels 15 away from the sub-heat dissipation flow channel 14 are connected to each other.

[0086] The coolant enters the sub-inlet channel 142 through the sub-inlet 144 and flows to the sub-main channel 141. After part of the coolant exchanges heat with the heat dissipation portion 115 of the heat sink 11, it flows to the sub-outlet channel 143. Part of the coolant is diverted from the sub-main channel 141 to the auxiliary channel 15, exchanges heat with the mounting portion 116, then flows back to the sub-main channel 141, and then flows to the sub-outlet channel 143, and then flows out from the sub-outlet channel 143 through the sub-outlet 145, thereby realizing the circulation of the coolant and achieving heat dissipation of the heat sink 11, the connecting piece 35 and the pole.

[0087] In this embodiment, by providing the auxiliary flow channel 15 on the mounting portion 116 , the flow area of ​​the coolant can be increased, thereby increasing the heat dissipation area, and further improving the heat dissipation efficiency of the heat dissipation bracket 10 .

[0088] See also Fig.10 and Fig.11 , Fig.10 is a schematic structural diagram of a heat dissipation bracket 10 provided in a fourth embodiment of the present invention, Fig.11 yes Fig.10 A schematic cross-sectional structure diagram of the heat dissipation bracket 10 is shown.

[0089] This embodiment and Figure 4 The difference of the illustrated embodiment is that the heat dissipation bracket 10 illustrated in this embodiment further includes a water supply member 16. The heat dissipation plate 11 is fixedly connected to the water supply member 16 and communicates with the heat dissipation channel 13 in the heat dissipation plate 11. The water supply member 16 is used to provide cooling liquid to the heat dissipation channel 13 to realize the circulation of the cooling liquid.

[0090] Please also read Fig.12 , Fig.12 yes Fig.10 A schematic structural diagram of the water supply component 16 in the heat dissipation bracket 10 is shown.

[0091] The water supply member 16 is a long tubular structure. The material of the water supply member 16 can be plastic, or rubber, etc. The water supply member 16 includes a first end face 161, a second end face 162, an upper surface 163 and a lower surface 164. The first end face 161 and the second end face 162 are arranged opposite to each other and are respectively located at opposite ends of the length direction (X direction) of the water supply member 16. The upper surface 163 and the lower surface 164 are arranged opposite to each other and are respectively located at opposite ends of the thickness direction (Z direction) of the water supply member 16.

[0092] The water supply member 16 is provided with a water supply channel 165. In the present embodiment, there are two water supply channels 165. The two water supply channels 165 are respectively a water inlet channel 166 and a drainage channel 167. The water inlet channel 166 and the drainage channel 167 are arranged side by side and spaced apart along the width direction (Y direction) of the water supply member 16, and the opposite ends of the water supply channel 165 and the drainage channel 167 both pass through the first end face 161 and the second end face 162. The lower surface 164 is provided with a plurality of first through holes and second through holes (not shown). The plurality of first through holes pass through the lower surface 164 and are connected to the water supply channel 165, and the plurality of first through holes correspond one-to-one to the first protrusions 101 of the plurality of sub-heat sinks 12. The plurality of second through holes pass through the lower surface 164 and are connected to the drainage channel 167, and the plurality of second through holes correspond one-to-one to the second protrusions 102 of the plurality of sub-heat sinks 12.

[0093] The water supply member 16 is installed on the heat sink 11. The lower surface 164 faces the first side surface 111, and the extension direction of the water supply member 16 is roughly consistent with the extension direction of the first side surface 111. The multiple first through holes correspond to the multiple first protrusions 101 one by one, and each first protrusion 101 is installed in the corresponding first through hole and fixedly connected and sealed to the water supply member 16. The water inlet channel 166 is connected to the sub-water inlet channels 142 of the multiple sub-heat dissipation channels 14. The multiple second through holes correspond to the multiple second protrusions 102 one by one, and each second protrusion 102 is installed in the corresponding second through hole and fixedly connected and sealed to the water supply member 16. The drainage channel 167 is connected to the sub-water outlet channels 143 of the multiple sub-heat dissipation channels 14.

[0094] The coolant in the water inlet channel 166 flows from the first through hole to the sub-water inlet 144 of the corresponding sub-heat dissipation channel 14, then flows from the sub-water inlet 144 to the sub-water inlet channel 142 of the corresponding sub-heat dissipation channel 14, and then flows from the sub-water inlet channel 142 to the sub-main body channel 141, exchanges heat with the heat dissipation plate 11, absorbs the heat transmitted to the heat dissipation plate 11 from the connecting piece 35 and the pole of the battery cell 20, and reduces the temperature of the heat dissipation plate 11. Then, the coolant flows from the sub-main body channel 141 to the sub-water outlet channel 143, and flows to the corresponding second through hole through the sub-water outlet 145, and then flows into the drainage channel 167, thereby realizing the circulation of the coolant and transmitting the heat of the heat dissipation plate 11 to the outside.

[0095] In this embodiment, by providing a water supply member 16, and by providing coolant to the heat dissipation channel 13 separately through the water supply member 16, the flow rate of the coolant in the heat dissipation channel 13 can be ensured to be uniform, so that the heat dissipation of the heat dissipation plate 11 is uniform, and the heat dissipation performance of the heat dissipation bracket 10 is improved. In addition, by providing a water inlet channel 166 and a water outlet channel 167 in the water supply member 16, the coolant before absorbing heat can be separated from the coolant after absorbing heat, so that the temperature of the coolant entering the heat dissipation channel 13 from the water inlet 131 can be kept low, and the heat exchange rate between the coolant and the heat dissipation plate 11 can be improved, and the heat dissipation efficiency of the heat dissipation bracket 10 can be improved.

[0096] In other embodiments, there may be one water supply channel 165. The sub-water inlet channels 142 and the sub-water outlet channels 143 of the plurality of sub-heat dissipation channels 14 are all connected to the water supply channel 165. The coolant in the water supply channel 165 enters the sub-heat dissipation channel 14 from the sub-water inlet 144 of each sub-heat dissipation channel 14, and then flows back to the water supply channel 165 from the corresponding sub-water outlet 145.

[0097] The above are only some embodiments and implementations of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A heat dissipation bracket, applied to a battery module, wherein the battery module comprises a connecting piece and a battery cell, wherein a plurality of the battery cells are arranged side by side, and the connecting piece is electrically connected to the poles of the plurality of the battery cells, wherein: The heat dissipation bracket includes a heat dissipation plate, the heat dissipation plate includes a heat dissipation portion and a mounting portion, the heat dissipation portion and the mounting portion are arranged side by side along the width direction of the heat dissipation plate and are fixedly connected, the heat dissipation portion is provided with a heat dissipation channel, the heat dissipation channel includes a water inlet and a water outlet, the water inlet and the water outlet are respectively located at two ends of the heat dissipation channel; the mounting portion is used to install the connecting plate and the poles of the plurality of battery cells.

2. The heat dissipation bracket according to claim 1, characterized in that: The heat sink includes a plurality of sub-heat sinks, which are arranged side by side and fixedly connected along the length direction of the heat sink. The heat dissipation channel includes a plurality of sub-heat dissipation channels, each of the sub-heat sinks is provided with one sub-heat dissipation channel, and the plurality of sub-heat dissipation channels are arranged at intervals.

3. The heat dissipation bracket according to claim 1, characterized in that: The heat dissipation support also includes a coolant, which is located in the heat dissipation channel. The coolant enters the heat dissipation channel from the water inlet and flows out of the heat dissipation channel from the water outlet.

4. The heat dissipation bracket according to claim 1, characterized in that: The heat sink includes a first side surface, which is located on a side of the heat dissipation portion away from the mounting portion. The water inlet and the water outlet are both arranged on the first side surface and penetrate the first side surface, and the water inlet and the water outlet are spaced apart along the length direction of the first side surface.

5. The heat dissipation bracket according to claim 1, characterized in that: The mounting portion is provided with a plurality of mounting holes, and the plurality of mounting holes are arranged side by side and at intervals along the length direction of the heat dissipation bracket, and the plurality of mounting holes are used to pass through the poles of the battery module.

6. The heat dissipation bracket according to claim 5, characterized in that: The heat sink is further provided with an auxiliary heat dissipation channel, which is provided at the mounting portion and located between any two adjacent mounting holes, and the auxiliary heat dissipation channel is communicated with the heat dissipation channel.

7. The heat dissipation bracket according to claim 1, characterized in that: The heat sink is made of plastic.

8. The heat dissipation bracket according to claim 1, characterized in that: The heat transfer coefficient of the heat dissipation bracket is 200W / m 2 K~2000W / m 2 K.

9. The heat dissipation support according to any one of claims 1 to 8, characterized in that: The heat dissipation bracket also includes a water supply component, which is provided with a water supply channel. The water supply component is fixedly connected to the heat dissipation plate, and the water inlet and the water outlet are both connected to the water supply channel.

10. The heat dissipation bracket according to claim 9, characterized in that: The water supply channel includes a water inlet channel and a drainage channel, the water inlet channel and the drainage channel are arranged side by side and at intervals along the width direction of the water supply member, the water inlet is communicated with the water inlet channel, and the water outlet is communicated with the drainage channel.

11. A battery module, characterized in that: It comprises a plurality of battery cells, a connecting piece and the heat dissipation bracket according to any one of claims 1 to 10, wherein the plurality of battery cells are arranged side by side, the heat dissipation bracket is mounted on the battery cells, the connecting piece is mounted on the mounting portion and is electrically connected to the poles of the plurality of battery cells.

12. A battery pack, characterized in that: Comprising the battery module as claimed in claim 11.

13. A battery pack, characterized in that: It comprises a liquid cooling plate and the heat dissipation bracket according to any one of claims 1 to 8, wherein the liquid cooling plate is provided with a flow channel, and the water inlet and the water outlet are both connected to the flow channel.

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