Energy storage device and energy storage system

Abstract

The utility model provides an energy storage device and an energy storage system, and the energy storage device comprises a battery system storage space for storing a battery system, and comprises a battery system heat dissipation unit, the battery system heat dissipation unit is provided with a battery system air inlet, a battery system air outlet and a battery system heat dissipation air duct located between the battery system air inlet and the battery system air outlet; the end portion heat dissipation unit is provided with an end portion air inlet, an end portion air outlet and an end portion air channel located between the end portion air inlet and the end portion air outlet, and when the end portion heat dissipation unit is located at the bottom of the battery system storage space, the energy storage device further comprises a first partition plate; the first partition plate is used for separating the end air inlet and the battery system air inlet. According to the energy storage device and the energy storage system, heat of the energy storage device can be effectively dissipated, and meanwhile the temperature difference in the energy storage device is small.

Description

Technical Field

[0001] The present application mainly relates to the field of electrochemical energy storage technology, and in particular to an energy storage device and an energy storage system. Background Art

[0002] The thermal management solutions in the energy storage industry are mainly divided into air cooling and liquid cooling. Compared with air cooling, liquid cooling has a smaller battery temperature rise, but a larger temperature difference between the battery cells (the temperature difference between the bottom and top of the energy storage cabinet). The air cooling solution is mainly divided into air conditioning cooling, which has a smaller temperature difference than liquid cooling (the temperature difference between the bottom and top of the energy storage cabinet), but a higher temperature rise. Compared with air cooling and liquid cooling, the temperature difference of naturally cooled batteries is smaller, but the temperature rise is larger.

[0003] Conventional liquid cooling and air-conditioning cooling solutions have some disadvantages. The existing liquid cooling solution requires a liquid cooling unit, a liquid cooling plate, and a multi-stage liquid cooling pipeline, which has high material costs. In addition, during the operation of the energy storage cabinet, the power consumption of the cooling machine is high, and the operating cost is high. However, the existing air-cooling solutions all use air conditioning for cooling, so the power consumption of the air conditioning is also relatively high. In addition, conventional battery cells are used in the existing solutions. The thermal management method of air-cooling air conditioning is not enough to keep the battery cells in the energy storage cabinet at an optimal operating temperature, which has a certain impact on the life of the battery cells and the life of the energy storage cabinet. At the same time, the temperature rise of the battery system is greater than the temperature rise of other functional equipment modules in the energy storage cabinet. Therefore, when using a fan for exhaust, there will be a problem of cross-winding, which increases the temperature difference inside the energy storage cabinet, resulting in poor heat dissipation inside the energy storage cabinet and affecting the heat dissipation efficiency of the entire machine. Utility Model Content

[0004] The technical problem to be solved by the present application is to provide an energy storage device and an energy storage system, which can effectively dissipate the heat of the energy storage device while reducing the temperature difference inside the energy storage device.

[0005] To solve the above technical problems, the present application provides an energy storage device, including a battery system, located in a battery system storage space; a battery system heat dissipation unit, located in the battery system storage space, the battery system heat dissipation unit having a battery system air inlet, a battery system air outlet, and a battery system heat dissipation air duct located between the battery system air inlet and the battery system air outlet; and an end heat dissipation unit, located in a space outside the battery system storage space, the end heat dissipation unit having an end air inlet, an end air outlet, and an end air duct located between the end air inlet and the end air outlet, wherein, when the end air inlet and the air inlet of the battery system are the same air inlet passage, the energy storage device also includes a first partition plate, which is used to separate the end air inlet and the battery system air inlet.

[0006] Optionally, the energy storage device further includes a functional equipment module, which is located in a space outside the battery system storage space, and the functional equipment module includes a current conversion system, a battery management system and / or a power distribution system.

[0007] Optionally, when the end air outlet and the battery system air outlet are located in the same air outlet passage, the energy storage device further includes a second partition plate, and the second partition plate is used to separate the end air outlet and the battery system air outlet.

[0008] Optionally, the battery system includes at least two columns of battery modules, and the energy storage device also includes one or more first guide plates located between each two adjacent columns of battery modules, and the first guide plates are used to distribute the gas flow entering the storage space of the battery system from the air inlet of the battery system.

[0009] Optionally, the battery module includes a battery with a calorific value lower than 1.9W and / or a battery cell with a specific heat capacity higher than 1750J / (kg·k).

[0010] Optionally, the battery module includes battery cells having an operating temperature of 25°C to 45°C.

[0011] Optionally, the energy storage device further includes a battery rack located in the battery system storage space, and the battery rack is used to place a plurality of battery modules.

[0012] Optionally, the energy storage device also includes one or more exhaust fans, which are connected to the battery system air outlet and / or the end air outlet, and are used to extract gas from the battery system storage space and / or the space outside the battery system storage space. The exhaust fans include axial flow fans, centrifugal fans and / or cross flow fans.

[0013] Optionally, the energy storage device further includes a second guide plate, a first end surface of the second guide plate is close to the area where the exhaust fan is located, and the second guide plate is used to guide the gas extracted from the battery system storage space to the exhaust fan.

[0014] Optionally, the energy storage device also includes one or more blowers, which are connected to the end air inlet and / or the battery system air inlet, and are used to provide gas for heat dissipation to the energy storage device. The blowers include axial flow fans, centrifugal fans and / or cross flow fans.

[0015] In order to solve the above technical problems, the present application provides an energy storage system, comprising one or more energy storage devices as described above.

[0016] Compared with the prior art, the present application can effectively dissipate the heat inside the energy storage device by performing fan heat dissipation after the battery system charging and discharging process is completed, and can achieve low power consumption of the whole machine, thereby reducing the cost of the energy storage device. At the same time, the present application can distribute the gas flow entering the energy storage device through the setting of the first guide plate to achieve the effect of uniform heat dissipation, and better discharge the heat dissipation gas from the energy storage device through the setting of the second guide plate, thereby improving the heat dissipation efficiency of the whole machine. Furthermore, the present application sets up two heat dissipation units, and separates the air inlet or outlet of the heat dissipation unit by a partition, thereby separating the heat dissipation of the battery system from the heat dissipation of other functional equipment modules, so that the temperature difference of the energy storage device will not increase because the temperature rise of the battery system is greater than the temperature rise of other functional equipment modules, thereby maintaining the temperature difference inside the energy storage device within a smaller range, which is beneficial to increasing the life of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present application. In the accompanying drawings:

[0018] Figure 1 is a side view of an energy storage system and an energy storage device therein in one embodiment of the present application;

[0019] Figure 2 This application is Figure 1 A front view of an energy storage system and an energy storage device therein in the embodiment shown;

[0020] Figure 3 is a side view of an energy storage system and an energy storage device therein in another embodiment of the present application;

[0021] Figure 4 is a side view of an energy storage system and an energy storage device therein in another embodiment of the present application;

[0022] Figure 5 This application is Figure 4 A front view of an energy storage system and an energy storage device therein in the embodiment shown;

[0023] Figure 6 is a side view of an energy storage system and an energy storage device therein in another embodiment of the present application;

[0024] Figure 7 This application is Figure 6 A front view of an energy storage system and an energy storage device therein in the illustrated embodiment.

[0025] Reference numerals

[0026] Battery System Cooling Unit 101

[0027] End cooling unit 105

[0028] Battery system storage space S1

[0029] Battery system air inlet 102

[0030] Battery system air outlet 103

[0031] Battery system cooling duct 104

[0032] Space S2 outside the battery system storage space S1

[0033] End air inlet 106

[0034] End air outlet 107

[0035] Bottom air duct 108

[0036] First partition plate 109

[0037] The second partition plate 110

[0038] Battery System111

[0039] The first guide plate 112

[0040] Exhaust fan 113

[0041] Air inlet passage L1

[0042] Air outlet L2

[0043] Battery module 300 DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0045] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0046] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0047] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0048] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0049] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0050] This application refers to Figure 1 and Figure 2 An energy storage system 100 is proposed, comprising one or more energy storage devices 10, wherein the energy storage device 10 comprises a battery system storage space S1 for storing a plurality of battery systems 111 and a space S2 outside the battery system storage space S1, wherein the battery system storage space S1 is used to store the battery system 111, the battery system comprises a plurality of columns of battery modules 300, and the space S2 outside the battery system storage space S1 is used to store a functional device module 11. In this embodiment, the functional device module 11 is a current conversion system (PCS (Power Control System)), and in other embodiments of the present application, the functional device module 11 also comprises a battery management system (BMS (Battery Management System)) and / or a power distribution system.

[0051] In this embodiment, the energy storage device 10 further includes a battery system heat dissipation unit 101 and an end heat dissipation unit 105. Specifically, the battery system heat dissipation unit 101 is located in the battery system storage space S1, and the battery system heat dissipation unit 101 has a battery system air inlet 102, a battery system air outlet 103, and a battery system heat dissipation air duct 104 located between the battery system air inlet 102 and the battery system air outlet 103. The end heat dissipation unit 105 is located in the space S2 outside the battery system storage space S1, and the end heat dissipation unit 105 has an end air inlet 106, an end air outlet 107, and an end air duct 108 located between the end air inlet 106 and the end air outlet 107. Exemplarily, the end air outlet 107 can be located at any position on the energy storage device 10.

[0052] In this embodiment, in the energy storage device 10, the end air inlet 106 and the battery system air inlet 102 are in the same air inlet passage L1 (that is, the end air inlet 106 and the battery system air inlet adopt the same air source for air intake), and the energy storage device 10 also includes a first partition plate 109, which is used to separate the end air inlet 106 and the battery system air inlet 102.

[0053] Preferably, the energy storage device 10 performs heat dissipation after the battery system 111 is charged and discharged. When the energy storage device 10 starts to dissipate heat, in the battery system heat dissipation unit 101, gas can enter the battery system storage space S1 through the battery system air inlet 102 and flow along the battery system heat dissipation duct 104 (the gas flow direction is as follows: Figure 1 The gas may enter the space S2 outside the battery system storage space S1 through the end air inlet 106 and flow along the end air duct 108 (the gas flow direction is shown in FIG. 1 ). Figure 1 Middle Arrow or Figure 3 ). Figure 1 In the illustrated embodiment, due to the provision of the first partition plate 109, the gas entering the energy storage device 10 through the end air inlet 106 and the battery system air inlet 102 is isolated, and cross-flow of the gas entering the battery system heat dissipation unit 101 and the end heat dissipation unit 105 is avoided, thereby controlling the temperature difference inside the energy storage device 10 within a smaller range.

[0054] Further references Figure 2 In this embodiment, the battery system 111 includes at least two columns of battery modules 300, and the energy storage device 10 further includes a first guide plate 112 located between each two adjacent columns of battery modules 300. The first guide plate 112 is used to distribute the gas flow entering the battery system storage space S1 from the battery system air inlet 102. Exemplarily, the energy storage device 10 may include a battery module 300 and a plurality of first guide plates 112, but the present application is not limited thereto.

[0055] On the other hand, the battery system 111 includes several columns of battery modules 300, and the battery modules 300 may include batteries with a calorific value lower than 1.9w and / or battery cells with a specific heat capacity higher than 1750J / (kg·k) (not shown). The battery module 300 may also include high temperature resistant battery cells, wherein the operating temperature of the high temperature resistant battery cells is 25°C to 45°C. The energy storage device 10 dissipates heat after the battery system 111 completes the charging and discharging process. During the charging and discharging process of the battery system 111, the energy storage device 10 relies on the natural heat dissipation of the cabinet surface. The use of high temperature resistant batteries can enable the energy storage device 10 to maintain a small temperature difference inside the cabinet during the charging and discharging process.

[0056] Preferably, in this embodiment, the energy storage device 10 further includes a battery rack (not shown) located in the battery system storage space S1 , and the battery rack is used to place a plurality of battery modules 300 .

[0057] Reference Figure 3 , Figure 3An energy storage system 200 is proposed, including an energy storage device 20. Since the components in the energy storage device 20 have the same structure and function as the components in the energy storage device 10, the same reference numerals are used. Figure 3 As shown, in this embodiment, the end air outlet 107 may also be located at the bottom of the energy storage device 20 , while in other embodiments of the present application, the end air outlet 107 may be adaptively adjusted according to the position of the end air inlet 106 .

[0058] Reference Figure 4-5 , Figure 4 and Figure 5 FIG. 3 shows an energy storage system 300 in another embodiment of the present application, including a schematic diagram of the structure of an energy storage device 30. Since the components in the energy storage device 30 have the same structure and function as the components in the energy storage device 10, the same reference numerals are used. Figure 4 and Figure 5 In the illustrated embodiment, the end heat dissipation unit 105 can also be located at the top of the battery system storage space S1 in the energy storage device 30. At this time, the end air outlet 107 and the battery system air outlet 103 are in the same air outlet passage L2 (i.e., the air outlet directions of the end air outlet 107 and the battery system air outlet 103 are the same or adjacent), and the energy storage device 30 also includes a second partition plate 110, which is used to separate the end air outlet 107 and the battery system air outlet 103. The provision of the second partition plate 110 can prevent the gas discharged from the end air outlet 107 from returning to the interior of the energy storage device 30 through the exhaust fan 113, so that the temperature difference inside the energy storage device 30 is maintained within a smaller range. The heat dissipation process of the energy storage device 30 can refer to the heat dissipation process of the energy storage device 10, and no further details are given here.

[0059] In various embodiments of the present application, the energy storage device includes the energy storage devices 10, 20 and 30 described above, each including two exhaust fans 113, and the exhaust fans 113 can be located at the top, back, side or bottom of the energy storage device 10. Figure 1 and Figure 2 as well as Figure 3 to Figure 5 In the multiple embodiments of the present invention, the exhaust fan 113 is located at the top of the energy storage device, and in the Figure 6-7 In the energy storage device of the energy storage system in the illustrated multiple embodiments, the exhaust fan 113 is located at the back of the energy storage device. Figure 6-7 The energy storage system 400 in another embodiment of the present application is shown, including a schematic diagram of the structure of the energy storage device 40. In multiple embodiments of the present application, no matter where the exhaust fan 113 is located on the energy storage device, the exhaust fan 113 is connected to the battery system air outlet 103. When heat dissipation begins, the exhaust fan 113 is used to extract the gas in the battery system storage space S1 and discharge it through the battery system air outlet 103.

[0060] In this embodiment, the energy storage device 10 further includes a second guide plate (not shown), a first end surface of the second guide plate (not shown) is close to the area where the exhaust fan 113 is located, and the second guide plate 114 is placed obliquely to guide the gas extracted from the battery system storage space S1 to the fan. Exemplarily, in other embodiments of the present application, the number of exhaust fans may be one or more, and the exhaust fan 113 may be an axial flow fan, a centrifugal fan and / or a cross flow fan.

[0061] This embodiment is preferred, and any embodiment provided in the present application may also include one or more blowers (not shown), which may be connected to the end air inlet and / or the battery system air inlet to provide gas for heat dissipation for the energy storage device.

[0062] The present application can effectively dissipate heat inside the energy storage device by using a fan to dissipate heat after the battery system charge and discharge process is completed, and can achieve low power consumption of the entire device, thereby reducing the cost of the energy storage device. Furthermore, the present application sets up two heat dissipation units, and separates the air inlet or outlet of the heat dissipation unit by a partition, thereby separating the heat dissipation of the battery system from the heat dissipation of other functional equipment modules, so that the temperature difference of the energy storage device will not increase because the temperature rise of the battery system is greater than the temperature rise of other functional equipment modules, thereby maintaining the temperature difference inside the energy storage device within a smaller range, which is beneficial to improving the life of the battery system.

[0063] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0064] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0065] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0066] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0067] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. An energy storage device, characterized in that: include: A battery system, located in the battery system storage space; A battery system heat dissipation unit, located in the battery system storage space, wherein the battery system heat dissipation unit has a battery system air inlet, a battery system air outlet, and a battery system heat dissipation air duct located between the battery system air inlet and the battery system air outlet; as well as an end heat dissipation unit, located in a space outside the battery system storage space, the end heat dissipation unit having an end air inlet, an end air outlet, and an end air duct located between the end air inlet and the end air outlet, Wherein, when the end air inlet and the air inlet of the battery system are located in the same air inlet passage, the energy storage device further includes a first partition plate, and the first partition plate is used to separate the end air inlet and the air inlet of the battery system.

2. The energy storage device according to claim 1, characterized in that It also includes a functional equipment module, which is located in a space outside the battery system storage space, and the functional equipment module includes a current conversion system, a battery management system and / or a power distribution system.

3. The energy storage device according to claim 1, characterized in that: When the end air outlet and the battery system air outlet are located in the same air outlet passage, the energy storage device further includes a second partition plate, and the second partition plate is used to separate the end air outlet and the battery system air outlet.

4. The energy storage device according to claim 1, characterized in that: The battery system includes at least two columns of battery modules, and the energy storage device also includes one or more first guide plates located between each two adjacent columns of the battery modules, and the first guide plates are used to distribute the gas flow entering the battery system storage space from the battery system air inlet.

5. The energy storage device according to claim 4, characterized in that: The battery module includes a battery with a calorific value lower than 1.9W and / or a battery cell with a specific heat capacity higher than 1750J / (kg·k).

6. The energy storage device according to claim 4, characterized in that: The battery module includes a battery cell monomer with an operating temperature of 25°C to 45°C.

7. The energy storage device according to claim 4, characterized in that: It also includes a battery rack located in the battery system storage space, and the battery rack is used to place the battery module.

8. The energy storage device according to claim 1, characterized in that: It also includes one or more exhaust fans, which are connected to the battery system air outlet and / or the end air outlet, and are used to extract gas from the battery system storage space and / or the space outside the battery system storage space. The exhaust fans include axial flow fans, centrifugal fans and / or cross flow fans.

9. The energy storage device according to claim 8, characterized in that: The energy storage device further includes a second guide plate, a first end surface of which is close to the area where the exhaust fan is located, and the second guide plate is used to guide the gas extracted from the battery system storage space to the exhaust fan.

10. The energy storage device according to claim 1, characterized in that: It also includes one or more blowers, which are connected to the end air inlet and / or the battery system air inlet, and are used to provide gas for heat dissipation to the energy storage device. The blower includes an axial flow fan, a centrifugal fan and / or a cross flow fan.

11. An energy storage system, characterized in that: include: One or more energy storage devices as claimed in any one of claims 1 to 10.

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