Energy storage device

Abstract

The utility model provides an energy storage device. The energy storage device comprises: a housing having an installation space; the battery core assembly is arranged in the mounting space; the voltage conversion circuit is arranged in the mounting space and is electrically connected with the battery cell assembly; the first heat dissipation mechanism comprises a first heat conduction assembly and a first heat dissipation assembly; the first heat conduction assembly comprises a first heat conduction plate and at least one heat conduction block arranged on the first heat conduction plate; the voltage conversion circuit is arranged on the surface of the side, away from the first heat conduction plate, of the at least one heat conduction block, and the at least one heat conduction block is configured to conduct heat generated by the voltage conversion circuit to the first heat conduction plate; the first heat dissipation assembly is arranged on the surface of the side, away from the at least one heat conduction block, of the first heat conduction plate, and the first heat dissipation assembly is configured to dissipate heat on the first heat conduction plate. The energy storage device can dissipate heat generated by the voltage conversion circuit. And a cooling fan does not need to be arranged, so that noise is reduced, and user experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage technology field especially relates to a kind of energy storage devices. BACKGROUND

[0002] Energy storage device is a kind of small energy storage structure of built-in lithium ion battery, which is used to replace traditional small fuel generator, and its application in people's life is more and more popular, and accordingly, people have high requirements on the performance of energy storage device.

[0003] However, in the process of use, a large amount of heat will be generated by the internal electronic components of the energy storage device, which can easily cause the energy storage device to be damaged due to overheating. UTILITY MODEL CONTENT

[0004] The present application provides an energy storage device, which can solve the problem that a large amount of heat will be generated by the internal electronic components of the energy storage device in the process of use, which can easily cause the energy storage device to be damaged due to overheating.

[0005] To solve the above technical problems, the present application adopts one technical scheme: providing an energy storage device, which comprises: a housing having an installation space; an electric core assembly arranged in the installation space; a voltage conversion circuit arranged in the installation space and electrically connected with the electric core assembly; a first heat dissipation mechanism comprising a first heat conduction assembly and a first heat dissipation assembly; the first heat conduction assembly comprises a first heat conduction plate and at least one heat conduction block arranged on the first heat conduction plate; the voltage conversion circuit is arranged on the side surface of the at least one heat conduction block away from the first heat conduction plate, and the at least one heat conduction block is configured to conduct the heat generated by the voltage conversion circuit to the first heat conduction plate; the first heat dissipation assembly is arranged on the side surface of the first heat conduction plate away from the at least one heat conduction block, and the first heat dissipation assembly is configured to dissipate the heat on the first heat conduction plate.

[0006] In an embodiment of the present application, the first heat dissipation assembly comprises a second heat conduction plate and a heat dissipation pipe, the second heat conduction plate is arranged on the side of the first heat conduction plate away from the at least one heat conduction block; at least part of the heat dissipation pipe is arranged between the first heat conduction plate and the second heat conduction plate and in contact with the first heat conduction plate; and at least one end of the heat dissipation pipe is in communication with the external gas to dissipate the heat on the first heat conduction plate.

[0007] In one embodiment of the present application, the housing has a first side wall and a second side wall relative to each other, the first side wall includes a first high-conductivity heat element; one end of the heat dissipation pipe extends to contact the first high-conductivity heat element; and / or the second side wall includes a second high-conductivity heat element; the other end of the heat dissipation pipe extends to contact the second high-conductivity heat element; wherein, the first high-conductivity heat element and the second high-conductivity heat element are both connected to the external air.

[0008] In one embodiment of the present application, a cooling medium is provided in the heat dissipation pipe, and the cooling medium can be converted back and forth between gaseous state and liquid state to dissipate heat.

[0009] In one embodiment of the present application, the first heat conducting plate includes a heat conducting substrate and a temperature balancing layer; the heat conducting substrate has a first surface and a second surface opposite to each other; the at least one heat conducting block is provided on the first surface of the heat conducting substrate;

[0010] The temperature-averaging layer is provided on the first surface of the heat conducting plate and covers all surfaces of the first surface except the location of the at least one heat conducting block; and / or, the temperature-averaging layer is provided on the second surface of the heat conducting plate and covers the entire second surface.

[0011] In one embodiment of the present application, it further includes:

[0012] A heat shield is provided between the voltage conversion circuit and the battery core assembly and is configured to isolate the heat generated by the voltage conversion circuit from the battery core assembly; wherein the first heat dissipation mechanism is located between the heat shield and the voltage conversion circuit.

[0013] In one embodiment of the present application, the battery cell assembly includes a plurality of battery cells and a plurality of bus bars; the plurality of bus bars are configured to realize series connection and / or parallel connection of the plurality of battery cells;

[0014] The energy storage device also includes a second heat dissipation mechanism, which also includes an insulating plate and a plurality of hydrogel sheets; the insulating plate is attached to the surface of the plurality of busbars facing away from the plurality of battery cells; the plurality of hydrogel sheets are spaced apart on the surface of the insulating plate facing away from the busbars, are connected to the external air, and are configured to dissipate heat from the busbars.

[0015] In an embodiment of the present application, the second heat dissipation mechanism comprises a plurality of hydrogel films and a plurality of third high-conductivity heat dissipation members; an outer wall surface of each of the battery cells is wrapped with a hydrogel film; at least one third high-conductivity heat dissipation member is arranged on a side surface of each of the hydrogel films away from the battery cell; the hydrogel film is configured to conduct the heat generated by the battery cell to the third high-conductivity heat dissipation member; the third high-conductivity heat dissipation member is configured to dissipate the heat on the hydrogel film and fix the battery cell to the shell.

[0016] In an embodiment of the present application, the shell has a third side wall and a fourth side wall arranged oppositely, the third side wall and the fourth side wall are both arranged adjacent to the first side wall; and a ventilation hole is arranged on the third side wall and / or the fourth side wall; the plurality of hydrogel pieces, the hydrogel film and the plurality of third high-conductivity heat dissipation members are all in communication with the external gas through the ventilation hole.

[0017] In an embodiment of the present application, at least one of the first high-conductivity heat dissipation member, the second high-conductivity heat dissipation member and the third high-conductivity heat dissipation member is a high-conductivity plastic member; and / or,

[0018] At least one of the first high-conductivity heat dissipation member, the second high-conductivity heat dissipation member and the third high-conductivity heat dissipation member is provided with a plurality of heat dissipation fins.

[0019] The beneficial effects of the embodiments of the present application are as follows: the energy storage device provided by the embodiments of the present application comprises a shell, a battery cell assembly, a voltage conversion circuit and a first heat conduction mechanism; the shell has a mounting space; the battery cell assembly is arranged in the mounting space; the voltage conversion circuit is arranged in the mounting space and electrically connected to the battery cell assembly; the first heat dissipation mechanism comprises a first heat conduction assembly and a first heat dissipation assembly; the first heat conduction assembly comprises a first heat conduction plate and at least one heat conduction block arranged on the first heat conduction plate; the voltage conversion circuit is arranged on a side surface of the heat conduction block away from the first heat conduction plate, and the heat conduction block is configured to conduct the heat generated by the voltage conversion circuit to the first heat conduction plate; the first heat dissipation assembly is arranged on a side surface of the first heat conduction plate away from the heat conduction block, and the first heat dissipation assembly is configured to dissipate the heat on the first heat conduction plate. In this way, the heat generated by the voltage conversion circuit can be conducted by the heat conduction block and the first heat conduction plate of the first heat conduction assembly, and the heat on the first heat conduction plate can be dissipated by the first heat dissipation assembly, so as to realize heat dissipation of the heat generated by the voltage conversion circuit, thereby reducing the risk of damage of the energy storage device due to overheating. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The overall structure schematic diagram of the energy storage device provided by an embodiment of the present application is shown in the figure;

[0021] Figure 2 The overall structure schematic diagram of the energy storage device provided by an embodiment of the present application is shown in the figure; Figure 1Schematic diagram of the internal structure of the energy storage device shown;

[0022] Figure 3 for Figure 1 A disassembled schematic diagram of the energy storage device shown;

[0023] Figure 4 A schematic structural diagram of a battery cell assembly provided in one embodiment of the present application;

[0024] Figure 5 for Figure 3 A schematic structural diagram of the first heat dissipation mechanism;

[0025] Figure 6 A schematic structural diagram of a second heat dissipation mechanism provided in one embodiment of the present application.

[0026] Description of Reference Numerals

[0027] 1-housing; 11-first high-conductivity heat element; 12-third side wall; 121-ventilation hole; 13-fourth side wall; 2-battery cell assembly; 21-battery cell; 22-bus; 3-voltage conversion circuit; 4-first heat dissipation mechanism; 41-first thermally conductive component; 411-first thermally conductive plate; 412-thermal block; 42-first heat dissipation component; 421-second thermally conductive plate; 422-heat pipe; 4221-bending portion; 5-thermal insulation board; 6-second heat dissipation mechanism; 61-hydrogel film; 62-third high-conductivity heat element; 63-insulating board; 64-hydrogel sheet. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] The terms "first," "second," and "third" in this application are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of such features. In the description of this application, "multiple" means at least two, for example, two, three, etc., unless otherwise specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications also change accordingly. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0030] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] To prevent overheating and burning of energy storage devices during use, cooling fans are typically installed on the devices to dissipate heat from the electronic components within the devices through air cooling. However, these fans generate noise during operation, which can reduce the user experience. Furthermore, in related technologies, energy storage devices typically only dissipate heat from the voltage conversion circuitry, while battery cell components often rely on natural cooling. This can lead to significant heating of the cells at high power rates, making them susceptible to temperature protection and impacting the user experience. Furthermore, the overall cooling efficiency of the energy storage device is low.

[0032] Based on this, an embodiment of the present application provides an energy storage device that can not only dissipate heat for various electronic components in a voltage conversion circuit without generating noise, but also dissipate heat for battery cell assemblies. The energy storage device has a high heat dissipation utilization rate as a whole.

[0033] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0034] See also Figures 1 to 3 , Figure 1 A schematic diagram of the overall structure of an energy storage device provided in one embodiment of the present application;Figure 2 for Figure 1 Schematic diagram of the internal structure of the energy storage device shown; Figure 3 for Figure 1 A schematic diagram of a disassembled energy storage device is shown. In this embodiment, an energy storage device is provided that can be used for outdoor travel, emergency rescue, medical rescue, outdoor work, and the like. The energy storage device includes a housing 1, a battery cell assembly 2, a voltage conversion circuit 3, and a first heat dissipation mechanism 4.

[0035] The housing 1 has an installation space. The battery cell assembly 2, the voltage conversion circuit 3 and the first heat dissipation mechanism 4 are arranged in the installation space. The battery cell assembly 2 is the main component of the energy storage device and plays the role of storing electrical energy. For details, see Figure 4 , Figure 4 This is a schematic diagram of the structure of a battery cell assembly according to one embodiment of the present application. The battery cell assembly 2 includes multiple battery cells 21 and multiple busbars 22. The multiple battery cells 21 are arranged in a layer, and each battery cell 21 has a positive electrode tab and a negative electrode tab. All busbars 22 are configured to connect the multiple battery cells 21 in series and / or in parallel.

[0036] In one specific embodiment, the busbars 22 include at least one first busbar and at least one second busbar. All first busbars are configured to connect the positive electrode tabs of multiple battery cells 21 in series and / or in parallel; all second busbars are configured to connect the negative electrode tabs of multiple battery cells 21 in series and / or in parallel. The first and second busbars can be made of aluminum alloy.

[0037] The voltage conversion circuit 3 is electrically connected to the battery cell assembly 2 and is used to convert DC power into a constant frequency and constant voltage or a frequency and voltage modulation to enable the input and output of power. The voltage conversion circuit 3 includes a PCB (Printed Circuit Board) and multiple electronic components disposed on the PCB. The PCB has opposing upper and lower surfaces, and the multiple electronic components can be soldered to the upper and / or lower surfaces of the PCB; the multiple electronic components include inductors, capacitors, power tubes, transformers, relays, and the like.

[0038] In one embodiment, the battery cell assembly 2 and the voltage conversion circuit 3 are stacked along the height direction Z of the housing 1; multiple electronic components are located on the side surface of the PCB away from the battery cell assembly 2; the following embodiments of this application all take this as an example.

[0039] Due to the scattered distribution and uneven height of electronic components, the electronic components generate a lot of heat. At present, the more common heat dissipation method in the industry is air cooling. Traditional air cooling is prone to local hot spots. Due to the principle of the wooden barrel end plate, the overall performance of the energy storage device will be affected. In addition, the fan will bring noise during operation. On the other hand, the fan outlet side is hot air. During use, users are prone to hot air hitting their faces, which gives them a poor experience.

[0040] To this end, combined Figure 2 and Figure 5 , Figure 5 for Figure 3 Structural diagram of the first heat dissipation mechanism 4; the embodiment of the present application further enables the energy storage device to include a first heat dissipation mechanism 4, and the first heat dissipation mechanism 4 is configured to dissipate heat generated by the voltage conversion circuit 3.

[0041] like Figure 5 As shown, the first heat dissipation mechanism 4 includes a first heat conducting component 41 and a first heat dissipation component 42. The first heat conducting component 41 includes a first heat conducting plate 411 and at least one heat conducting block 412 provided on the first heat conducting plate 411.

[0042] In one embodiment, there is one heat conducting block 412. In another embodiment, there are multiple heat conducting blocks 412; for example, there are two, three, four, or more heat conducting blocks 412. The multiple heat conducting blocks 412 are spaced apart. The following embodiments of this application use the example of multiple heat conducting blocks 412.

[0043] The voltage conversion circuit 3 is disposed on a surface of the first heat-conducting assembly 41, with the plurality of heat-conducting blocks 412 facing away from the first heat-conducting plate 411. Specifically, the PCB or electronic components of the voltage conversion circuit 3 abut against the heat-conducting blocks 412. All heat-conducting blocks 412 of the first heat-conducting assembly 41 are configured to transfer heat generated by the operation of the plurality of electronic components of the voltage conversion circuit 3 to the first heat-conducting plate 411. The first heat dissipation assembly 42 is disposed on a surface of the first heat-conducting plate 411 facing away from the heat-conducting blocks 412 and is configured to dissipate heat from the first heat-conducting plate 411.

[0044] This solution allows heat generated by the voltage conversion circuit 3 to be conducted through the heat-conducting block 412 and first heat-conducting plate 411 of the first heat-conducting assembly 41. The heat on the first heat-conducting plate 411 is then dissipated away from the first heat-dissipating assembly 42, thereby dissipating the heat generated by the voltage conversion circuit 3 and reducing the risk of damage to the energy storage device due to overheating. Furthermore, the energy storage device produces low noise during the heat dissipation process, improving the user experience and providing a more compact layout.

[0045] In some embodiments, the first heat conducting plate 411 includes a heat conducting substrate and a temperature balancing layer (not shown). The heat conducting substrate has a first surface and a second surface opposite to each other; all heat conducting blocks 412 are disposed on the first surface of the heat conducting substrate.

[0046] In one embodiment, the temperature-averaging layer is disposed on the first surface of the thermally conductive substrate and covers all surfaces of the first surface except for the location of the thermally conductive block 412. It should be noted that the temperature-averaging layer contacts the circumferential edge of the thermally conductive block 412 to ensure uniform heat distribution across all locations of the thermally conductive substrate. Of course, a certain gap may exist between the temperature-averaging layer and the circumferential edge of the thermally conductive block 412 to prevent the temperature-averaging layer from being pulled up during replacement of the thermally conductive block 412, thereby affecting the subsequent temperature-averaging effect.

[0047] In another embodiment, a temperature-uniform layer is provided on the second surface of the heat-conducting substrate and covers the entire second surface. In this way, the temperature-uniform layer can achieve uniform heat distribution on the first heat-conducting plate 411 to reduce the risk of local hot spots.

[0048] Of course, in other embodiments, the temperature-averaging layer can be provided on the first surface of the thermally conductive substrate and cover all surfaces of the first surface except where the thermally conductive block 412 is located; and the temperature-averaging layer can be provided on the second surface of the thermally conductive substrate and cover the entire second surface.

[0049] The thermally conductive substrate may be an aluminum plate or a copper sheet. The thermally conductive block 412 may be an aluminum block or a copper block. The temperature balancing layer may be a graphene thermally conductive sheet or a graphene thermally conductive film, or an ultra-thin vapor chamber (VC). The thermally conductive substrate and the temperature balancing layer may be integrally formed.

[0050] In some embodiments, a thermally conductive gasket and thermally conductive silicone cloth (not shown) are provided between the thermally conductive block 412 and the electronic components of the voltage conversion circuit 3. The thermally conductive gasket facilitates heat transfer between the voltage conversion circuit 3 and the thermally conductive block 412 and fills the gap. The thermally conductive silicone cloth insulates the voltage conversion circuit 3 from the thermally conductive block 412, thereby transferring heat from the voltage conversion circuit 3 to the first thermally conductive plate 411.

[0051] In some embodiments, combined Figure 5 The first heat dissipation assembly 42 includes a second heat conducting plate 421 and a heat dissipation pipe 422. The second heat conducting plate 421 is disposed on a side of the first heat conducting plate 411 that faces away from the heat conducting block 412. At least a portion of the heat dissipation pipe 422 is disposed between the first heat conducting plate 411 and the second heat conducting plate 421, and contacts the first heat conducting plate 411 and the second heat conducting plate 421, respectively; thus, heat from the first heat conducting plate 411 can be transferred to the heat dissipation pipe 422. Specifically, at least one end of the heat dissipation pipe 422 is in communication with the outside air to dissipate heat from the first heat conducting plate 411.

[0052] In some embodiments, the first heat conducting plate 411 and the second heat conducting plate 421 are both plate-shaped; the second heat conducting plate 421 is stacked on the side of the first heat conducting plate 411 facing away from the heat conducting block 412. In some specific embodiments, the second heat conducting plate 421 and the first heat conducting plate 411 can be connected and fixed by other fixing members to ensure that at least a portion of the heat pipe 422 is always in contact with the first heat conducting plate 411 and the second heat conducting plate 421, respectively, thereby ensuring that heat from the first heat conducting plate 411 can be transferred to the second heat conducting plate 421 through the heat pipe 422. Of course, the second heat conducting plate 421 and the first heat conducting plate 411 can also be clamped and fixed by the battery cell assembly 2 and the voltage conversion circuit 3.

[0053] In one embodiment, a cooling medium (not shown) is provided within the heat pipe 422. The cooling medium can switch back and forth between a gaseous state and a liquid state to dissipate heat. Thus, the cooling medium absorbs heat during the transition from liquid to gas and dissipates the heat during the transition from gas to liquid. The cooling medium can be a fluorinated liquid or water, for example.

[0054] In one embodiment, a surface of the second heat conducting plate 421 facing the first heat conducting plate 411 is provided with a receiving groove, and a portion of the heat dissipation pipe 422 is press-fitted into the receiving groove.

[0055] Specifically, the heat pipe 422 is brazed and pressed into the receiving groove, ensuring full contact with the second heat conducting plate 421. Optionally, in this embodiment, the number of heat pipes 422 can be two, three, or more, and the second heat conducting plate 421 is provided with a plurality of receiving grooves equal to the number of heat pipes 422, with the plurality of receiving grooves spaced apart. This arrangement ensures that each heat pipe 422 is in heat exchange with the battery cell assembly 2, further improving the overall heat dissipation efficiency of the battery cell assembly 2.

[0056] The heat dissipation pipe 422 includes a clamping portion and a bending portion 4221; the clamping portion is located between the first heat conducting plate 411 and the second heat conducting plate 421, the bending portion 4221 is connected to the clamping portion, and the bending portion 4221 bends from the clamping portion toward the first heat conducting plate 411 to form one end of the heat dissipation pipe 422. Specifically, as Figure 5 As shown, the heat dissipation pipe 422 may have a bent portion 4221 ; in this embodiment, one end of the clamping portion away from the bent portion 4221 forms the other end of the heat dissipation pipe 422 ; this embodiment of the present application takes this as an example.

[0057] Of course, in other embodiments, the heat dissipation pipe 422 may also have two bent portions 4221 , and the two bent portions 4221 are respectively connected to the two ends of the clamping portion and respectively form the two ends of the heat dissipation pipe 422 .

[0058] Combine Figure 1 and Figure 3 The housing 1 has a first sidewall and a second sidewall facing each other. In one embodiment, the first sidewall of the housing 1 includes a first highly conductive heat element 11, and one end of the heat pipe 422 extends to contact the first highly conductive heat element 11, thereby dissipating heat from the heat pipe 422 through the first highly conductive heat element 11. Specifically, a bent portion 4221 of the heat pipe 422 abuts the first highly conductive heat element 11, thereby increasing the contact area between the heat pipe 422 and the first highly conductive heat element 11 and improving heat dissipation efficiency.

[0059] In one embodiment, the second sidewall of the housing 1 includes a second highly conductive heat member (not shown). The other end of the heat pipe 422 extends to contact the second highly conductive heat member, dissipating heat from the heat pipe 422 through the second highly conductive heat member. Specifically, the other bent portion 4221 of the heat pipe 422 abuts the second highly conductive heat member, increasing the contact area between the heat pipe 422 and the second highly conductive heat member and further improving the heat dissipation efficiency of the heat pipe 422.

[0060] In another embodiment, the first side wall of the housing 1 includes a first high-conductivity heat element 11, and one end of the heat pipe 422 extends to contact the first high-conductivity heat element 11; and the second side wall of the housing 1 includes a second high-conductivity heat element (not shown), and the other end of the heat pipe 422 extends to contact the second high-conductivity heat element, so as to dissipate the heat on the heat pipe 422 through the first high-conductivity heat element 11 and the second high-conductivity heat element.

[0061] It should be noted that the thermal conductivity of the high-conductivity heat dissipation element involved in this application is not less than 20W / mk, such as 20W / mk, 25W / mk, 30W / mk, 35W / mk, 40W / mk, 45W / mk, 50W / mk, 60W / mk, 70W / mk, 80W / mk, etc. In this way, the heat dissipation capacity can be further improved.

[0062] In some embodiments, at least one of the first high-conductivity heat sink 11 and the second high-conductivity heat sink is a highly conductive plastic. Compared to highly conductive metal or other structural components, plastic components are lighter, resulting in a lighter overall energy storage device structure, which can improve user experience. The highly conductive plastic used in this application is a polymer matrix material uniformly filled with a thermally conductive filler to improve its thermal conductivity.

[0063] In one embodiment, at least one of the first high-conductivity heat element 11 and the second high-conductivity heat element is provided with a plurality of heat dissipation fins, thereby increasing the heat dissipation area, accelerating the heat dissipation, and improving the heat dissipation effect.

[0064] The following describes the entire process of the first heat dissipation mechanism 4 dissipating heat for the voltage conversion circuit 3 .

[0065] The heat dissipation pipe 422 is embedded under the first heat conducting plate 411. When the heat of the voltage conversion circuit 3 is transferred to the heat conducting block 412, the heat on the heat conducting block 412 is transferred to the first heat conducting plate 411. The first heat conducting plate 411 then transfers the heat to the heat dissipation pipe 422. The cooling medium in the heat dissipation pipe 422 is heated, undergoes a phase change and gasifies, thereby absorbing the heat of the voltage conversion circuit 3. The cooling medium in the heat dissipation pipe 422 changes into gas after the phase change, expands and moves to the end of the heat dissipation pipe 422. The end of the heat dissipation pipe 422 is directly connected to the first high-conductivity heat member 11 on the first side wall of the shell 1. Direct or indirect contact, since the first high-conductivity heat element 11 is connected to the external air, the high-temperature gas at the end of the heat dissipation pipe 422 transfers heat to the first high-conductivity heat element 11 of the shell 1, and the first high-conductivity heat element 11 transfers the heat transferred by the heat dissipation pipe 422 through convection heat exchange with the external air to achieve heat dissipation of the high-temperature gas inside the heat dissipation pipe 422, and condenses the high-temperature gas inside the heat dissipation pipe 422 into liquid, and the liquid then flows back to the clamping part through gravity and the capillary structure inside the heat dissipation pipe 422, thereby realizing the circulation of the entire cooling medium, thereby ensuring efficient heat dissipation of the voltage conversion circuit 3.

[0066] In one embodiment, combined Figure 3 The energy storage device further includes a heat shield 5 disposed between the voltage conversion circuit 3 and the battery cell assembly 2. The heat shield 5 is configured to isolate the heat generated by the battery cell assembly 2 from the voltage conversion circuit 3. The first heat dissipation mechanism 4 is located between the heat shield 5 and the voltage conversion circuit 3. The provision of the heat shield 5 reduces the heat invasion of the battery cell assembly 2 by the heat generated by the voltage conversion circuit 3, thereby reducing the impact on the battery cell assembly 2.

[0067] The heat insulation board 5 may be an aerogel board, heat insulation foam or mica sheet, etc.

[0068] In the related art, the battery cell 21 mostly adopts natural heat dissipation. Under high rate, the battery cell 21 generates serious heat. The battery cell 21 is easily temperature-protected, which affects the user experience. Among them, the discharge rate of the battery cell 21 exceeding 1C is called high rate discharge. For this reason, in one embodiment, combined with Figure 2 and Figure 3 The energy storage device further includes a second heat dissipation mechanism 6 , which is disposed in the installation space and configured to dissipate the heat generated by the battery cell 21 .

[0069] like Figure 3As shown, the second heat dissipation mechanism 6 includes multiple hydrogel films 61 and multiple third highly conductive thermal elements 62. The outer wall of each battery cell 21 is wrapped with a hydrogel film 61; it is understood that the hydrogel films 61 are in contact with the surface of the battery cell 21, and at least one third highly conductive thermal element 62 is provided on the side of each hydrogel film 61 facing away from the battery cell 21. The hydrogel films 61 are configured to conduct heat generated by the battery cell 21 to the corresponding third highly conductive thermal element 62. The third highly conductive thermal element 62 is configured to dissipate heat from the hydrogel films 61 and secure the battery cell 21 to the housing 1.

[0070] That is to say, the third high-conductivity heat dissipation element 62 can fix the battery cells 21 on the one hand; on the other hand, the high-conductivity heat dissipation element itself has a high thermal conductivity, which also increases the heat transfer effect and can reduce the temperature difference between the battery cells 21.

[0071] In one embodiment, two third high-conductivity heat dissipators 62 are correspondingly provided for each battery cell 21 . The two third high-conductivity heat dissipators 62 are respectively sleeved on the outside of the hydrogel film 61 and located at opposite ends of the battery cell 21 to fix the two ends of the battery cell 21 on the housing 1 .

[0072] Specifically, in this embodiment, the hydrogel film 61 is attached to the outer surface of the battery cell 21. When the battery cell 21 is charging or discharging, the heat generated by the battery cell 21 is transferred to the hydrogel film 61. The water vapor inside the hydrogel film 61 undergoes a phase change and vaporizes, thereby absorbing the heat generated by the battery cell 21 and dissipating it to the surface of the battery cell 21. The heat absorbed by the hydrogel film 61 is then transferred to the third high-conductivity heat element 62, which dissipates the heat evenly through its inherent thermal conductivity.

[0073] The hydrogel film 61 can cover the entire outer surface of the battery cell 21. The third highly conductive thermal member 62 dissipates heat while securing the battery cell 21 to the housing 1. In one embodiment, a third highly conductive thermal member 62 is respectively mounted on the positive and negative terminals of the battery cell 21 to secure the positive and negative terminals of the battery cell 21 to the housing 1.

[0074] The third high-conductivity heat dissipation element 62 may also be a high-conductivity plastic component to further reduce the weight of the energy storage device and enhance user experience.

[0075] In one embodiment, the third high-conductivity heat element 62 may also be provided with a plurality of heat dissipation fins to increase the heat dissipation area of ​​the third high-conductivity heat element 62 , accelerate heat dissipation, and improve the heat dissipation effect.

[0076] In a specific embodiment, combining Figure 3The shell 1 further has a third side wall 12 and a fourth side wall 13 oppositely arranged, the third side wall 12 is connected to the first side wall and the second side wall respectively, the fourth side wall 13 is also connected to the first side wall and the second side wall respectively, and the first side wall, the third side wall 12, the second side wall and the fourth side wall 13 are sequentially connected in order and surround to form a mounting space. In a specific embodiment, a plurality of ventilation holes 121 are formed in the third side wall 12 and / or the fourth side wall 13; the plurality of hydrogel films 61 and the plurality of third high-thermal-conductivity and high-thermal-dissipation members 62 are in communication with the external gas through the ventilation holes 121, thereby ensuring the natural convection of the energy storage device, improving the heat exchange of the battery cell assembly 2, and achieving the cooling effect of the battery cell assembly 2.

[0077] In some embodiments, the heat of the battery cell 21 can also be further conducted to the bus bar 22 through the tab thereof. To this end, in combination with Figure 3 and Figure 6 , Figure 6 FIG. 2 is a structural schematic diagram of a second heat dissipation mechanism 6 provided by an embodiment of the present application; the second heat dissipation mechanism 6 further includes an insulating plate 63 and a plurality of hydrogel pieces 64, the insulating plate 63 is attached to the side surface of the plurality of bus bars 22 away from the plurality of battery cells 21; the plurality of hydrogel pieces 64 are arranged at intervals on the side surface of the insulating plate 63 away from the bus bars 22, and are in communication with the external gas, and are configured to dissipate the heat on the bus bars 22. It should be noted that, here, the plurality of bus bars 22 can be the first bus bar or the second bus bar described above. In an embodiment, the plurality of bus bars 22 refer to the bus bars 22 located between the battery cell 21 and the heat insulation plate 5.

[0078] The above scheme can insulate the bus bars 22 and the hydrogel pieces 64 through the insulating plate 63, and conduct the heat on the bus bars 22 to the hydrogel pieces 64 through the insulating plate 63, so as to achieve the dissipation of the heat of the battery cell 21.

[0079] Among them, the bus bar piece and the insulating plate 63 can be integrally formed and directly attached to the bus bar 22 through the insulating plate 63, thereby solving the problem of insulation between the bus bar 22 and the hydrogel piece 64 under the premise of ensuring heat dissipation, and reducing the installation process.

[0080] Among them, the hydrogel piece 64 can also be in communication with the external gas through the ventilation hole 121 on the third side wall 12 and / or the fourth side wall 13. The insulating plate 63 can be a PC (Polycarbonate) insulating sheet or a PVC (Polyvinylchloride) insulating sheet. When the hydrogel film 61 or the hydrogel piece 64 covers the heat source, the water in the hydrogel film 61 or the hydrogel piece 64 will evaporate quickly and quickly take away the heat, reducing the temperature of the heat source. When the electronic components are not working, the hydrogel film 61 or the hydrogel piece 64 can spontaneously absorb water vapor from the surrounding environment to supplement its own water, realizing recycling.

[0081] In this embodiment, the heat generated by the battery cell 21 is transferred to the busbar 22 through the tab of the battery cell 21, and the water gel sheet 64 takes away the heat transferred by the battery cell 21 to the busbar 22, achieving the effect of further heat dissipation of the battery cell 21. Among them, when the battery cell 21 stops charging and discharging, the water gel film 61 and the water gel sheet 64 on the battery cell 21 absorb water vapor in the environment through the ventilation hole 121 on the third side wall 12 and / or the fourth side wall 13 to supplement the lost medium in the charging and discharging process, so as to ensure the sustainable heat dissipation effect of the next charging and discharging cycle.

[0082] The above-mentioned battery cell assembly 2 has a double-layer heat dissipation effect through the water gel film 61 on the surface of the battery cell 21 and the water gel sheet 64 on the busbar 22.

[0083] The energy storage device provided in this embodiment includes a shell 1, a battery cell assembly 2, a voltage conversion circuit 3, and a first heat dissipation mechanism; the shell 1 has a mounting space; the battery cell assembly 2 is arranged in the mounting space; the voltage conversion circuit 3 is arranged in the mounting space and electrically connected with the battery cell assembly 2; the first heat dissipation mechanism 4 includes a first heat conduction assembly 41 and a first heat dissipation assembly 42; the first heat conduction assembly 41 includes a first heat conduction plate 411 and at least one heat conduction block 412 arranged on the first heat conduction plate 411; the voltage conversion circuit 3 is arranged on the side surface of the heat conduction block 412 away from the first heat conduction plate 411, and all the heat conduction blocks 412 are configured to conduct the heat generated by the voltage conversion circuit 3 to the first heat conduction plate 411; the first heat dissipation assembly 42 is arranged on the side surface of the first heat conduction plate 411 away from the heat conduction block 412, and the first heat dissipation assembly 42 is configured to dissipate the heat on the first heat conduction plate 411. In this way, the heat generated by the voltage conversion circuit 3 can be conducted through the first heat conduction assembly 41, and the heat on the first heat conduction plate 411 can be dissipated through the first heat dissipation assembly 42, so as to achieve heat dissipation of the heat generated by the voltage conversion circuit 3, thereby reducing the risk of damage of the energy storage device due to overheating. The energy storage device can effectively dissipate heat without the need to set a heat dissipation fan, thereby reducing noise and improving user experience.

[0084] Of course, in other embodiments, if factors such as noise and hot air on the face are not considered, the energy storage device of the present application can further be provided with a fan to improve the heat dissipation efficiency.

[0085] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An energy storage device, characterized in that: include: a housing having a mounting space; A battery cell assembly is arranged in the installation space; A voltage conversion circuit is provided in the installation space and is electrically connected to the battery cell assembly; The first heat dissipation mechanism includes a first heat conducting assembly and a first heat dissipation assembly; the first heat conducting assembly includes a first heat conducting plate and at least one heat conducting block disposed on the first heat conducting plate; the voltage conversion circuit is disposed on a surface of the at least one heat conducting block facing away from the first heat conducting plate, and the at least one heat conducting block is configured to conduct heat generated by the voltage conversion circuit to the first heat conducting plate; The first heat dissipation component is disposed on a surface of the first heat conducting plate that is away from the at least one heat conducting block, and the first heat dissipation component is configured to dissipate heat on the first heat conducting plate.

2. The energy storage device according to claim 1, characterized in that The first heat dissipation assembly includes a second heat conducting plate and a heat dissipation pipe, wherein the second heat conducting plate is arranged on a side of the first heat conducting plate away from the at least one heat conducting block; at least a portion of the heat dissipation pipe is arranged between the first heat conducting plate and the second heat conducting plate and contacts the first heat conducting plate; and at least one end of the heat dissipation pipe is connected to the external air to dissipate the heat on the first heat conducting plate.

3. The energy storage device according to claim 2, characterized in that The housing has a first side wall and a second side wall opposite to each other, the first side wall includes a first high-conductivity heat member; one end of the heat pipe extends to contact the first high-conductivity heat member; and / or, The second side wall includes a second high-conductivity heat dissipation element; the other end of the heat dissipation pipe extends to contact the second high-conductivity heat dissipation element; wherein the first high-conductivity heat dissipation element and the second high-conductivity heat dissipation element are both in communication with the external air.

4. The energy storage device according to claim 2, characterized in that A cooling medium is provided in the heat dissipation pipe, and the cooling medium can be converted back and forth between gaseous state and liquid state to dissipate heat.

5. The energy storage device according to claim 1, characterized in that The first heat conducting plate comprises a heat conducting substrate and a temperature balancing layer; the heat conducting substrate has a first surface and a second surface opposite to each other; the at least one heat conducting block is provided on the first surface of the heat conducting substrate; The temperature-uniform layer is provided on the first surface of the thermally conductive substrate and covers all surfaces of the first surface except where the at least one thermally conductive block is located; And / or, the temperature-uniform layer is provided on the second surface of the thermally conductive substrate and covers the entire second surface.

6. The energy storage device according to claim 1, characterized in that Also includes: A heat shield is provided between the voltage conversion circuit and the battery core assembly and is configured to isolate the heat generated by the voltage conversion circuit from the battery core assembly; wherein the first heat dissipation mechanism is located between the heat shield and the voltage conversion circuit.

7. The energy storage device according to any one of claims 1 to 6, characterized in that: The battery cell assembly includes a plurality of battery cells and a plurality of bus bars; the plurality of bus bars are configured to realize the series connection and / or parallel connection of the plurality of battery cells; The energy storage device also includes a second heat dissipation mechanism, which also includes an insulating plate and a plurality of hydrogel sheets; the insulating plate is attached to the surface of the plurality of busbars facing away from the plurality of battery cells; the plurality of hydrogel sheets are spaced apart on the surface of the insulating plate facing away from the busbars, are connected to the external air, and are configured to dissipate heat from the busbars.

8. The energy storage device according to claim 7, characterized in that The second heat dissipation mechanism includes multiple hydrogel films and multiple third high-conductivity heat dissipation components; the outer wall surface of each battery cell is wrapped with a hydrogel film; each hydrogel film is provided with at least one third high-conductivity heat dissipation component on the side surface facing away from the battery cell; the hydrogel film is configured to conduct the heat generated by the battery cell to the third high-conductivity heat dissipation component; the third high-conductivity heat dissipation component is configured to dissipate the heat on the hydrogel film and fix the battery cell to the casing.

9. The energy storage device according to claim 8, characterized in that The shell has a third side wall and a fourth side wall arranged opposite to each other, and the third side wall and the fourth side wall are both arranged adjacent to the first side wall of the shell; and ventilation holes are opened on the third side wall and / or the fourth side wall; the multiple hydrogel sheets, the hydrogel membrane and the multiple third high-conductivity thermal components are all connected to the external air through the ventilation holes.

10. The energy storage device according to claim 8, characterized in that: At least one of the first high-conductivity heat sink, the second high-conductivity heat sink, and the third high-conductivity heat sink is a high-conductivity plastic part; and / or, At least one of the first high-conductivity heat sink, the second high-conductivity heat sink, and the third high-conductivity heat sink is provided with a plurality of heat dissipation fins.

Images