Energy storage device

Abstract

The utility model discloses an energy storage device which comprises a box body and an energy storage unit, a first installation cavity is defined by the box body, the energy storage unit is arranged in the first installation cavity, at least part of the cavity wall of the first installation cavity is constructed into a heat exchange wall, and the heat exchange wall is suitable for exchanging heat with the energy storage unit. Therefore, according to the energy storage device provided by the utility model, at least part of the cavity wall of the first mounting cavity is constructed into the heat exchange wall, and the heat exchange wall is suitable for exchanging heat with the energy storage unit, so that the heat exchange effect of the energy storage unit and the box body is realized, the working temperature of the energy storage unit is favorably maintained at a proper working temperature, and the energy storage unit can be kept in a high-power interval; the working performance of the energy storage unit is ensured, and the use performance of the energy storage device is further ensured.

Description

Technical Field

[0001] The utility model relates to the field of energy storage devices, in particular to an energy storage device. Background Art

[0002] In the related art, in the existing energy storage device, the energy storage unit cannot exchange heat with the box, so that during the operation of the energy storage unit, the temperature of the energy storage unit is difficult to be within the appropriate operating temperature range, affecting the working performance of the energy storage unit and further affecting the performance of the energy storage device. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide an energy storage device to achieve the effect of heat exchange between the energy storage unit and the box, which is conducive to maintaining the working temperature of the energy storage unit at a suitable working temperature.

[0004] The energy storage device according to the utility model comprises:

[0005] A box body and an energy storage unit, wherein the box body defines a first installation cavity, the energy storage unit is arranged in the first installation cavity, and the cavity wall of the first installation cavity is at least partially constructed as a heat exchange wall, and the heat exchange wall is suitable for heat exchange with the energy storage unit.

[0006] According to the energy storage device of the utility model, the cavity wall of the first installation cavity is at least partially constructed as a heat exchange wall, and the heat exchange wall is suitable for exchanging heat with the energy storage unit, so as to achieve the effect of heat exchange between the energy storage unit and the box body, which is beneficial to maintaining the working temperature of the energy storage unit at a suitable working temperature, so that the energy storage unit can be maintained in a high power range, ensuring the working performance of the energy storage unit, and then ensuring the performance of the energy storage device.

[0007] In some examples of the present invention, a partition wall is provided in the first installation cavity, and the partition wall divides the first installation cavity into a plurality of independent sub-installation cavities, each of the sub-installation cavities is provided with the energy storage unit, and the partition wall is used for heat exchange with the corresponding energy storage unit.

[0008] In some examples of the present invention, the energy storage unit includes at least one battery pack.

[0009] In some examples of the present invention, the energy storage unit includes at least one energy storage module, and the energy storage module includes a plurality of battery packs.

[0010] In some examples of the present invention, the energy storage device also includes: a heat exchange unit, the heat exchange unit includes a first heat exchange component and a second heat exchange component, the first heat exchange component is arranged in the first installation cavity and exchanges heat with the energy storage unit, and the second heat exchange component exchanges heat with the box body.

[0011] In some examples of the present invention, the first heat exchange component is disposed in each of the sub-mounting cavities.

[0012] In some examples of the present invention, the box body further defines an installation space with at least one end open, and a partial structure of the heat exchange unit is installed in the installation space.

[0013] In some examples of the present invention, the heat exchange unit includes a heat sink, and the heat sink is disposed in the installation space.

[0014] In some examples of the present invention, the installation space is located above the first installation cavity.

[0015] In some examples of the present invention, the installation space is located at the rear side of the first installation cavity.

[0016] In some examples of the present invention, the box body includes a box body frame, the box body frame has a plurality of frame beams, an assembly space is formed in the frame beams, and the second heat exchange element is installed in the assembly space.

[0017] In some examples of the present invention, the energy storage device further includes: a power conversion unit, the box body further defines a second installation cavity, the power conversion unit is disposed in the second installation cavity, and the energy storage unit is electrically connected to the power conversion unit.

[0018] In some examples of the present invention, the housing further defines a third installation cavity, and the heat exchange unit includes a heat exchanger, which is disposed in the third installation cavity.

[0019] In some examples of the present invention, the energy storage device also includes: a power distribution and busbar unit, which is arranged in the third installation cavity, and the power distribution and busbar unit includes a power distribution module and a busbar module, the power distribution module is connected to the power conversion unit of the energy storage device, and the busbar module is connected between the power conversion unit and an external device.

[0020] In some examples of the present invention, the second installation cavity is communicated with the third installation cavity.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1It is an energy storage device according to the first embodiment of the utility model;

[0024] Figure 2 It is an energy storage device according to the second embodiment of the utility model;

[0025] Figure 3 It is an energy storage device according to the third embodiment of the utility model;

[0026] Figure 4 This is an energy storage device according to the fourth embodiment of the utility model.

[0027] Reference numerals:

[0028] Energy storage device 100; box body 1; box body frame 10; frame beam 11; partition wall 12;

[0029] Energy storage unit 2; battery pack 20; energy storage module 21;

[0030] First mounting cavity 31; sub-mounting cavity 310; second mounting cavity 32; third mounting cavity 33; mounting space 34;

[0031] Power conversion unit 4. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] Reference below Figure 1-Figure 4 Description: According to an embodiment of the utility model, the energy storage device 100 includes a housing 1 and an energy storage unit 2. The housing 1 defines a first installation cavity 31. The energy storage unit 2 is disposed in the first installation cavity 31. The cavity wall of the first installation cavity 31 is at least partially constructed as a heat exchange wall, which is suitable for exchanging heat with the energy storage unit 2.

[0034] In some embodiments, when the energy storage unit 2 is installed in the first installation cavity 31 , the energy storage unit 2 is attached to or adjacent to the heat exchange wall so that the energy storage unit 2 is suitable for heat exchange with the heat exchange wall to achieve the heat exchange effect between the energy storage unit 2 and the box body 1 .

[0035] In some embodiments, when the operating temperature of the energy storage unit 2 is higher than the suitable operating temperature and the temperature of the box 1 is lower than the operating temperature of the energy storage unit 2, heat is exchanged with the energy storage unit 2 through the heat exchange wall so that the box 1 absorbs the heat of the energy storage unit 2 to lower the temperature of the energy storage unit 2, thereby reducing the operating temperature of the energy storage unit 2 to a suitable operating temperature.

[0036] In some embodiments, when the operating temperature of the energy storage unit 2 is lower than the suitable operating temperature and the temperature of the cabinet 1 is higher than the operating temperature of the energy storage unit 2, heat is exchanged with the energy storage unit 2 through the heat exchange wall so that the energy storage unit 2 absorbs the heat of the cabinet 1 to increase the temperature of the energy storage unit 2, thereby increasing the operating temperature of the energy storage unit 2 to the suitable operating temperature.

[0037] By exchanging heat between the energy storage unit 2 and the heat exchange wall, the heat exchange effect between the energy storage unit 2 and the box body 1 is achieved, which is beneficial for maintaining the working temperature of the energy storage unit 2 at a suitable working temperature, so that the energy storage unit 2 can be kept in a high power range, ensuring the working performance of the energy storage unit 2, and then ensuring the performance of the energy storage device 100.

[0038] In some embodiments, the housing 1 may have a heat exchange flow channel, wherein at least a portion of the heat exchange flow channel is arranged on the heat exchange wall. When the heat exchange medium flows through the heat exchange flow channel, the heat of the heat exchange medium is exchanged with the heat exchange wall. The heat exchange medium can transfer the heat from other areas of the housing 1 to the heat exchange wall, or the heat of the heat exchange wall is dispersedly transferred to other areas of the housing 1 through the heat exchange medium, and the energy storage unit 2 exchanges heat with the heat exchange wall, thereby achieving the effect of heat exchange between the energy storage unit 2 and the housing 1.

[0039] In some embodiments, the heat exchange wall is constructed as a partial structure of the housing 1 , and the energy storage unit 2 directly exchanges heat with the heat exchange wall, thereby also achieving the effect of heat exchange between the energy storage unit 2 and the housing 1 .

[0040] Therefore, according to the energy storage device 100 of the embodiment of the utility model, the cavity wall of the first installation cavity 31 is at least partially constructed as a heat exchange wall, and the heat exchange wall is suitable for exchanging heat with the energy storage unit 2, so as to achieve the effect of heat exchange between the energy storage unit 2 and the box body 1, which is beneficial to maintain the working temperature of the energy storage unit 2 at a suitable working temperature, so that the energy storage unit 2 can be maintained in a high power range, ensuring the working performance of the energy storage unit 2, and then ensuring the performance of the energy storage device 100.

[0041] In some embodiments, in combination Figure 1-Figure 4 As shown, the length direction of the energy storage device 100 is Figure 1-Figure 4 The X direction shown in FIG. 1 and the height direction of the energy storage device 100 are Figure 1-Figure 4 The Z direction shown in .

[0042] In some embodiments of the present invention, Figure 1-Figure 4 As shown, a partition wall 12 is provided in the first installation cavity 31 , and the partition wall 12 divides the first installation cavity 31 into a plurality of independent sub-installation cavities 310 . An energy storage unit 2 is provided in each sub-installation cavity 310 , and the partition wall 12 is used for heat exchange with the corresponding energy storage unit 2 .

[0043] In some embodiments, at least one energy storage unit 2 may be disposed in each first installation cavity 31, and since two adjacent sub-installation cavities 310 are separated by a partition wall 12, the multiple sub-installation cavities 310 are independent of each other, so that when an energy storage unit 2 located in a different sub-installation cavity 310 fails (for example, thermal runaway occurs in the energy storage unit 2), the failed energy storage unit 2 can be prevented from affecting the energy storage units 2 in other sub-installation cavities 310, thereby facilitating improving the safety of the energy storage device 100.

[0044] In some embodiments, the energy storage unit 2 exchanges heat with the partition wall 12, which is beneficial for maintaining the operating temperature of the energy storage unit 2 at a suitable operating temperature, and the partition wall 12 can be constructed as a partial structure of the box body 1 to achieve the effect of heat exchange between the energy storage unit 2 and the box body 1, which can further help maintain the operating temperature of the energy storage unit 2 at a suitable operating temperature and ensure the performance of the energy storage device 100.

[0045] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the energy storage unit 2 includes at least one battery pack 20, that is, one energy storage unit 2 may include one battery pack 20, or one energy storage unit 2 may include multiple battery packs 20. The battery pack 20 is used to store and release electrical energy. The more battery packs 20 the energy storage unit 2 has, the more electrical energy the energy storage unit 2 can store. Therefore, the number of battery packs 20 of the energy storage unit 2 can be specifically set according to the actual use requirements of the energy storage device 100, so that the energy storage device 100 can meet different use requirements.

[0046] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the energy storage unit 2 includes at least one energy storage module 21, and the energy storage module 21 includes multiple battery packs 20, that is, one energy storage unit 2 may include one energy storage module 21, or one energy storage unit 2 may include multiple energy storage modules 21, and one energy storage module 21 includes multiple battery packs 20. In addition, in combination Figure 3 and Figure 4 As shown, a plurality of battery packs 20 are combined to form an energy storage module 21, so that the plurality of battery packs 20 are combined to form a whole, which is not only convenient for the energy storage unit 2 to be installed in the box 1, but also convenient for the transportation of the energy storage unit 2. In some embodiments of the present utility model, such as Figure 1-Figure 4 As shown, the energy storage device 100 further includes a heat exchange unit, which includes a first heat exchange component and a second heat exchange component. The first heat exchange component is disposed in the first installation cavity 31 and exchanges heat with the energy storage unit 2, and the second heat exchange component exchanges heat with the box body.

[0047] In some embodiments, the first heat exchanger is disposed on the partition wall 12, so that in the length direction of the energy storage device 100, the first heat exchanger is located between two adjacent energy storage units 2, so that the first heat exchanger can simultaneously exchange heat with the two adjacent energy storage units 2. In some embodiments, the first heat exchanger is embedded in the partition wall 12, so that in the length direction of the energy storage device 100, the first heat exchanger exchanges heat with the two adjacent energy storage units 2 through the surfaces on both sides of the partition wall 12, respectively, so as to achieve the effect that the first heat exchanger can simultaneously exchange heat with the two adjacent energy storage units 2, which is conducive to the working temperatures of the two adjacent energy storage units 2 being close to each other, and avoiding a large temperature difference between the two adjacent energy storage units 2. In addition, by embedding the first heat exchanger in the partition wall 12, not only can the heat exchange between the first heat exchanger and the energy storage unit 2 be guaranteed, but also the first heat exchanger can be prevented from occupying the space used to arrange the energy storage unit 2, which is conducive to the arrangement of the energy storage unit 2.

[0048] In some embodiments, the second heat exchange element exchanges heat with the housing 1 so that all devices installed in the housing 1 can achieve the effect of heat exchange, which is beneficial to eliminating the temperature difference between all devices installed in the housing 1, so that the internal space of the housing 1 can be in an environment with a balanced temperature, which is beneficial to improving the working performance of the energy storage device 100. In addition, since the second heat exchange element is integrated with the housing 1, it can avoid the second heat exchange element occupying the internal space of the housing 1, thereby greatly improving the internal space utilization of the housing 1.

[0049] In some embodiments of the utility model, a first heat exchange component is provided in each sub-installation cavity 310, so that the heat exchange unit can exchange heat for each energy storage unit 2 arranged in the energy storage device 100, so that the operating temperature of each energy storage unit 2 is within a suitable temperature range, so that the energy storage unit 2 can be maintained in a high power range, thereby ensuring the working performance of the energy storage unit 2.

[0050] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the housing 1 further defines an installation space 34 with at least one end open, and part of the structure of the heat exchange unit is installed in the installation space 34. The installation space 34 can be located on the top of the housing 1 and / or the peripheral wall of the housing 1, as shown in FIG. Figure 1-Figure 4 As shown, in some embodiments of the present invention, the installation space 34 is located at the top of the box body 1 for illustration, but the present invention is not limited to this. The installation space 34 can be located on the peripheral wall of the box body 1, or the box body 1 has multiple installation spaces 34, and the multiple installation spaces 34 can be located on the top and peripheral wall of the box body 1 respectively, or the multiple installation spaces 34 are all located on the top of the box body 1 or the peripheral wall of the box body 1.

[0051] like Figure 1-Figure 4As shown, the installation space 34 is located at the top of the box body 1 , that is, the installation space 34 is located above the first installation cavity 31 , or the installation space 34 is located on the peripheral wall of the box body 1 , and the installation space 34 can be located at the rear side of the first installation cavity 31 .

[0052] In some embodiments, the installation space 34 is constructed as a groove structure, part of the structure of the installation space 34 is located inside the box body 1, and the open end of the installation space 34 is coplanar with a side surface of the box body 1, so that the installation space 34 can be connected to the environment, so that part of the structure of the heat exchange unit installed in the installation space 34 can exchange heat with the air, so that the heat exchange medium flowing through the heat exchange unit can release heat in the process of flowing through the installation space 34, so as to release the heat in the heat exchange medium to the environment and reduce the temperature of the heat exchange medium.

[0053] In some embodiments, during the operation of the heat exchange unit, the heat exchange medium flows along the flow path of the heat exchange unit. During the flow of the heat exchange medium, the heat exchange effect of the heat exchange unit is achieved through the heat absorption and heat release of the heat exchange medium.

[0054] For example, when the energy storage device 100 is in a high temperature environment, the energy storage unit 2 and other devices installed in the box body 1 are affected by the ambient temperature, and there is a risk that the operating temperature of the energy storage unit 2 and other devices installed in the box body 1 is higher than the appropriate temperature range. Therefore, under the action of the heat exchange unit, the low-temperature heat exchange medium is driven to the first heat exchange element and the second heat exchange element. In the process of the low-temperature heat exchange medium flowing through the first heat exchange element and the second heat exchange element respectively, the heat exchange medium absorbs the heat generated by the energy storage unit 2 and other devices installed in the box body 1, so that the operating temperature of the energy storage unit 2 and other devices installed in the box body 1 is within a suitable temperature range, ensuring the working performance of the energy storage unit 2 and other devices installed in the box body 1, and then the heat exchange medium flowing through the first heat exchange element and the second heat exchange element flows through the installation space 34 along the flow path of the heat exchange unit. In the process of the heat exchange medium flowing through the installation space 34, the heat exchange medium exchanges heat with the air in the environment, so that the heat exchange medium releases heat to the environment, thereby reducing the temperature of the heat exchange medium.

[0055] After the heat exchange medium flows through the installation space 34 along the flow path of the heat exchange unit, the heat exchange medium flows to the first heat exchange element and the second heat exchange element respectively along the flow path of the heat exchange unit, and in the process of the heat exchange medium flowing from the installation space 34 to the first heat exchange element and the second heat exchange element, the heat exchange unit can further process the heat exchange medium so that the temperature of the heat exchange medium is reduced again. Therefore, when the heat exchange medium flows through the first heat exchange element and the second heat exchange element respectively, the heat exchange medium can absorb more heat and improve the working performance of the heat exchange unit.

[0056] For example, when the energy storage device 100 is in a low-temperature environment, the energy storage unit 2 and other devices installed in the box body 1 are affected by the ambient temperature, and there is a risk that the operating temperature of the energy storage unit 2 and other devices installed in the box body 1 is lower than the appropriate temperature range. Therefore, under the action of the heat exchange unit, the high-temperature heat exchange medium is driven to the first heat exchange element and the second heat exchange element. In the process that the high-temperature heat exchange medium flows through the first heat exchange element and the second heat exchange element respectively, the energy storage unit 2 and other devices installed in the box body 1 absorb the heat of the heat exchange medium, so that the operating temperature of the energy storage unit 2 and other devices installed in the box body 1 is within a suitable temperature range, ensuring the working performance of the energy storage unit 2 and other devices installed in the box body 1, and then the heat exchange medium can circulate along the flow path of the heat exchange unit through the first heat exchange element and the second heat exchange element, and before the heat exchange medium flows through the first heat exchange element and the second heat exchange element again, the heat exchange unit can process the heat exchange medium to increase the temperature of the heat exchange medium, thereby ensuring that the operating temperature of the energy storage unit 2 and other devices installed in the box body 1 is within a suitable temperature range.

[0057] In some embodiments of the present invention, the heat exchange unit may include a heat sink, which is disposed in the installation space 34, so that when the heat exchange medium flows through the heat sink, the heat exchange medium can exchange heat with the air, so that the heat can be released to the environment to reduce the temperature of the heat exchange medium. In some embodiments, the heat sink is configured as a heat sink fin, which has a large heat dissipation area, which is conducive to improving the heat dissipation effect of the heat sink.

[0058] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the box body 1 may include a box body frame 10, the box body frame 10 has a plurality of frame beams 11, an assembly space is formed in the frame beams 11, and the second heat exchange component is installed in the assembly space to achieve the effect of integrating the second heat exchange component with the box body 1, which can avoid the second heat exchange component occupying the internal space of the box body 1, greatly improve the internal space utilization of the box body 1, so that a larger number of energy storage units 2 can be arranged in the limited internal space of the box body 1, thereby improving the energy density of the energy storage device 100.

[0059] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the energy storage device 100 further includes a power conversion unit 4 , the housing 1 further defines a second installation cavity 32 , the power conversion unit 4 is disposed in the second installation cavity 32 , and the energy storage unit 2 is connected to the power conversion unit 4 .

[0060] The energy storage unit 2 is used to store and release electric energy, and the energy storage unit 2 is electrically connected to the power conversion unit 4, so that when the energy storage unit 2 is used to store electric energy, the power conversion unit 4 converts the alternating current output by the power supply device into direct current and inputs it into the energy storage unit 2 for storage, and when the energy storage unit 2 releases electric energy, the power conversion unit 4 converts the direct current output by the energy storage unit 2 into alternating current and outputs it, and a second installation cavity 32 for installing the power conversion unit 4 is formed in the box body 1, so that the power conversion unit 4 can be installed in the box body 1, so that the energy storage unit 2 and the power conversion unit 4 can be directly connected through a wiring harness, and both are arranged in the box body 1. Compared with the prior art, the indirect connection between the energy storage unit 2 and the power conversion unit 4 can be avoided, and the connection interface set due to the indirect connection between the energy storage unit 2 and the power conversion unit 4 can be effectively reduced, and the required wiring harness for the indirect connection between the energy storage unit 2 and the power conversion unit 4 can also be reduced, thereby reducing the cost.

[0061] And the power conversion unit 4 is installed in the housing 1, and the power conversion unit 4 can indirectly exchange heat with the second heat exchange member through the housing 1. In some embodiments, in some embodiments of the utility model, the second heat exchange member is a heat exchange tube, and when the heat exchange medium flows through the second heat exchange member, the heat exchange medium indirectly exchanges heat with the housing 1, so that the operating temperature of the device installed in the housing 1 (for example: energy storage unit 2, power conversion unit 4, etc.) is within a suitable temperature range, so that the device installed in the housing 1 can be maintained in a high power range, and the working performance of the device installed in the housing 1 is guaranteed.

[0062] In some embodiments of the present invention, Figure 1-Figure 4 As shown, along the height direction of the energy storage device 100, taking the first installation cavity 31 being arranged above the second installation cavity 32 as an example, when the energy storage unit 2 is installed in the first installation cavity 31 and the power conversion unit 4 is installed in the second installation cavity 32, in the height direction of the energy storage device 100, the energy storage unit 2 is arranged above the power conversion unit 4, so as to facilitate the connection between the energy storage unit 2 and the power conversion unit 4, which is beneficial to reduce the use of consumables of the wiring harness required for the connection between the energy storage unit 2 and the power conversion unit 4.

[0063] In addition, in the height direction of the energy storage device 100, the first installation cavity 31 is arranged above the second installation cavity 32, so that the power conversion unit 4 can be arranged close to the bottom of the energy storage device 100, so that the wiring harness for connecting the power conversion unit 4 and the external device can be arranged at the bottom of the energy storage device 100.

[0064] It should be noted that, in some embodiments of the present invention, the first installation cavity 31 is arranged above the second installation cavity 32 for explanation, but the present invention is not limited to this. Along the height direction of the energy storage device 100, the second installation cavity 32 can be arranged above the first installation cavity 31, so that when the energy storage unit 2 and the power conversion unit 4 are both installed in the box body 1, the power conversion unit 4 is arranged above the energy storage unit 2 in the height direction of the energy storage device 100.

[0065] The spatial arrangement relationship between the first installation cavity 31 and the second installation cavity 32 in the housing 1 can be specifically arranged according to actual needs, so as to facilitate the connection between the power conversion unit 4 arranged in the second installation cavity 32 and an external device (eg, a power supply device, a power-consuming device).

[0066] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the housing 1 may further define a third installation cavity 33 , and the heat exchange unit includes a heat exchanger, which is disposed in the third installation cavity 33 .

[0067] In some embodiments, the heat exchange unit also includes a valve body, the heat exchanger has a medium outlet and a medium inlet, the valve body has a first interface, a second interface and a third interface, the first interface is selectively connected to the second interface and the third interface, the first heat exchange element and the second heat exchange element are connected between the medium inlet and the first interface, the heat dissipation element is connected between the second interface and the medium inlet, and the third interface is connected to the medium inlet.

[0068] In some embodiments, the valve body can be constructed as a three-way valve, and the first interface is selectively connected to the second interface and the third interface. It can also be understood that when the first interface is connected to the second interface, the first interface is disconnected from the third interface, or when the first interface is connected to the third interface, the first interface is disconnected from the second interface.

[0069] In some embodiments, when the operating temperature of the energy storage unit 2 and other devices installed in the box body 1 is in a high temperature state, in the flow path of the heat exchange unit, the heat exchange medium forms a low temperature state after passing through the heat exchanger, and the heat exchange medium is discharged from the medium outlet of the heat exchanger and flows to the first heat exchange element and the second heat exchange element respectively. In the process of the heat exchange medium flowing through the first heat exchange element and the second heat exchange element respectively, since the temperature of the heat exchange medium is in a low temperature state compared to the operating temperature of the energy storage unit 2 and other devices installed in the box body 1, the heat exchange medium can absorb the heat of the heat exchange medium absorbed by the energy storage unit 2 and other devices installed in the box body 1.

[0070] After the heat exchange medium flows through the first heat exchange element and the second heat exchange element for heat exchange, the heat exchange medium flows into the valve body from the first interface, and the first interface is connected to the second interface, so that the heat exchange medium flows to the heat sink through the valve body. In the process of the heat exchange medium flowing through the heat sink, the heat exchange medium exchanges heat with the air in the environment, so that the heat exchange medium releases heat to the environment, thereby reducing the temperature of the heat exchange medium. Then, the heat exchange medium flows from the heat sink to the heat exchanger, and flows into the heat exchanger from the medium inlet. The heat exchanger further reduces the temperature of the heat exchange medium, so that the heat exchange medium forms a low-temperature state after passing through the heat exchanger. Then, the heat exchange medium can be discharged from the heat exchanger through the medium outlet and flow into the first heat exchange element and the second heat exchange element respectively. Therefore, when the operating temperature of the energy storage unit 2 and other devices installed in the box body 1 is in a high-temperature state, the effect of the heat exchange medium circulating along the flow path of the heat exchange unit is achieved.

[0071] In some embodiments, when the operating temperature of the energy storage unit 2 and other devices installed in the housing 1 is in a low temperature state, in the flow path of the heat exchange unit, the heat exchange medium forms a high temperature state after passing through the heat exchanger, and the heat exchange medium is discharged from the medium outlet of the heat exchanger and flows to the first heat exchange element and the second heat exchange element respectively. In the process of the heat exchange medium flowing through the first heat exchange element and the second heat exchange element respectively, since the temperature of the heat exchange medium is in a high temperature state compared to the operating temperature of the energy storage unit 2 and other devices installed in the housing 1, the heat exchange medium can release heat to the energy storage unit 2 and other devices installed in the housing 1.

[0072] In addition, when the valve body is in this working state, the first interface is connected to the third interface, so that the heat exchange medium flows to the heat exchanger after flowing through the first heat exchange element and the second heat exchange element respectively, and the heat exchange medium flows back to the heat exchanger through the medium inlet. Under the action of the heat exchanger, the heat exchange medium can form a high temperature state again, and then the heat exchange medium can be discharged from the heat exchanger through the medium outlet and flow into the first heat exchange element and the second heat exchange element respectively. Therefore, when the operating temperature of the energy storage unit 2 and other devices installed in the box body 1 is in a low temperature state, the effect of the heat exchange medium circulating along the flow path of the heat exchange unit is achieved.

[0073] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the energy storage device 100 may further include a power distribution and convergence unit, which is disposed in the third installation cavity 33. The power distribution and convergence unit includes a power distribution module and a convergence module. The power distribution module is connected to the power conversion unit 4, and the convergence module is connected between the power conversion unit 4 and an external device.

[0074] In some embodiments, when the energy storage unit 2 is used to release electric energy, the power conversion unit 4 converts the direct current output by the energy storage unit 2 into alternating current, so that the electric energy output by the energy storage unit 2 is transmitted to the external device in sequence along the power conversion unit 4 and the junction module, thereby achieving the effect that the energy storage device 100 is used to provide electric energy to the external device, and the power distribution module can control the voltage, current, etc. of the electric energy output from the power conversion unit 4.

[0075] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the second installation cavity 32 and the third installation cavity 33 are in communication, so that the power conversion unit 4 installed in the second installation cavity 32 is connected to the power distribution bus unit installed in the third installation cavity 33 .

[0076] In some embodiments of the present invention, Figure 1-Figure 4 As shown, along the length direction of the energy storage device 100, the third installation cavity 33 is located on the same side of the first installation cavity 31 and the second installation cavity 32, wherein the third installation cavity 33 is suitable for communicating with the second installation cavity 32, so as to facilitate the connection between the power conversion unit 4 installed in the second installation cavity 32 and the distribution bus unit installed in the third installation cavity 33.

[0077] In addition, it should be noted that the first installation cavity 31 is relatively independent of the second installation cavity 32 and the third installation cavity 33. For example, when the energy storage unit 2 installed in the first installation cavity 31 is connected to the power conversion unit 4 installed in the second installation cavity 32, the energy storage unit 2 and the power conversion unit 4 can be connected through a wiring harness, while the first installation cavity 31 and the second installation cavity 32 are not connected in space, so that the first installation cavity 31 and the second installation cavity 32 are relatively independent, so that when the energy storage unit 2 fails (for example: the energy storage unit 2 has thermal runaway), it can effectively avoid the risk caused by the failure of the energy storage unit 2 from affecting the power conversion unit 4, thereby reducing the risk of damage to the power conversion unit 4. Similarly, the first installation cavity 31 and the third installation cavity 33 are not connected in space, so they are not repeated.

[0078] In some embodiments, the box body 1 may further include a cover, which is assembled with the box body frame 10. The cover and the box body frame 10 jointly define the internal space of the box body 1 and the installation space 34. The internal space of the box body 1 is relatively independent of the installation space 34, wherein the internal space of the box body 1 may include a first installation cavity 31, a second installation cavity 32 and a third installation cavity 33.

[0079] In some embodiments, the heat exchanger, the valve body and the power distribution bus unit are all arranged in the third installation cavity 33, which is beneficial to the internal space arrangement of the box body 1, so that the internal space arrangement of the box body 1 is more compact.

[0080] In some embodiments, along the height direction of the box body 1, the heat exchanger and the valve body are arranged above the power distribution bus unit, but the utility model is not limited thereto, and the heat exchanger and the valve body can also be arranged below the power distribution bus unit.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An energy storage device, characterized in that: include: A box body and an energy storage unit, wherein the box body defines a first installation cavity, the energy storage unit is arranged in the first installation cavity, and the cavity wall of the first installation cavity is at least partially constructed as a heat exchange wall, and the heat exchange wall is suitable for heat exchange with the energy storage unit.

2. The energy storage device according to claim 1, characterized in that: The first installation cavity has a partition wall therein, and the partition wall divides the first installation cavity into a plurality of independent sub-installation cavities. Each of the sub-installation cavities is provided with the energy storage unit, and the partition wall is used for heat exchange with the corresponding energy storage unit.

3. The energy storage device according to claim 1, characterized in that: The energy storage unit includes at least one battery pack.

4. The energy storage device according to claim 1, characterized in that: The energy storage unit includes at least one energy storage module, and the energy storage module includes a plurality of battery packs.

5. The energy storage device according to claim 2, characterized in that: Also includes: A heat exchange unit, the heat exchange unit includes a first heat exchange component and a second heat exchange component, the first heat exchange component is arranged in the first installation cavity and exchanges heat with the energy storage unit, and the second heat exchange component exchanges heat with the box body.

6. The energy storage device according to claim 5, characterized in that: The first heat exchange component is disposed in each of the sub-mounting cavities.

7. The energy storage device according to claim 5, characterized in that: The box body further defines an installation space with at least one end open, and a partial structure of the heat exchange unit is installed in the installation space.

8. The energy storage device according to claim 7, characterized in that: The heat exchange unit includes a heat sink, and the heat sink is arranged in the installation space.

9. The energy storage device according to claim 7, characterized in that: The installation space is located above the first installation cavity.

10. The energy storage device according to claim 7, characterized in that: The installation space is located at the rear side of the first installation cavity.

11. The energy storage device according to any one of claims 5 to 10, characterized in that: The box body includes a box body frame, the box body frame has a plurality of frame beams, an assembly space is formed in the frame beams, and the second heat exchange element is installed in the assembly space.

12. The energy storage device according to claim 1, characterized in that: Also includes: The power conversion unit, the box body further defines a second installation cavity, the power conversion unit is arranged in the second installation cavity, and the energy storage unit is electrically connected to the power conversion unit.

13. The energy storage device according to claim 12, characterized in that: Also includes: The heat exchange unit, the box body also defines a third installation cavity, the heat exchange unit includes a heat exchanger, and the heat exchanger is arranged in the third installation cavity.

14. The energy storage device according to claim 13, characterized in that: Also includes: A power distribution and convergence unit is arranged in the third installation cavity, and the power distribution and convergence unit includes a power distribution module and a convergence module. The power distribution module is connected to the power conversion unit of the energy storage device, and the convergence module is connected between the power conversion unit and an external device.

15. The energy storage device according to claim 13, characterized in that: The second installation cavity is communicated with the third installation cavity.

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