Battery pack, battery cluster, and energy storage system device

Abstract

Provided are a battery pack, a battery cluster, and an energy storage system device. The battery pack specifically comprises: at least one battery cell (10) and at least one acquisition connector, wherein the battery cell (10) is connected between two electrodes of the battery pack, and the battery cell (10) is connected to the acquisition connector; the outside of a charged part in the battery pack is covered with a first insulating material (01); and the charged part in the battery pack comprises an electrode of the battery cell (10). The outside of the charged part in the battery pack is covered with the first insulating material (01), and the first insulating material can form an insulating layer between the charged part and an environment, i.e., the charged part is isolated from the environment, so that the battery pack will not be affected by condensation, thus reducing the possibility of electrical safety accidents in the battery pack, thereby improving the electrical safety performance of the battery pack.

Description

Battery pack, battery cluster and energy storage system device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 17, 2023, with application number 202310875689.1 and invention name “A battery pack, battery cluster and energy storage system device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of power electronics technology, and in particular to a battery pack, a battery cluster and an energy storage system device. Background Art

[0003] At present, the box of the liquid-cooled energy storage system adopts a protection level of IP54 or above, and the battery pack inside it usually follows the design method of automotive power batteries, that is, it mostly adopts a sealed shell design with a protection level of IP65 or above, thereby avoiding electrical safety problems caused by condensation inside the battery pack.

[0004] However, once the sealed shell of the battery pack leaks due to process problems or other factors, condensation may occur inside the battery pack, which may lead to electrical safety accidents and reduce the safety performance of the battery pack.

[0005] Therefore, how to improve the safety performance of battery packs is a technical problem that needs to be solved urgently.

[0006] Summary of the Invention

[0007] In view of this, the present invention provides a battery pack, a battery cluster and an energy storage system device to improve the safety performance of the battery pack.

[0008] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0009] A first aspect of the present application provides a battery pack, comprising: at least one battery cell and at least one collection connector;

[0010] The battery cell is connected between the two poles of the battery pack, and the battery cell is connected to the collection connector;

[0011] The outside of the charged part in the battery pack is coated with a first insulating material;

[0012] The charged parts include: electrodes of the battery cell.

[0013] Optionally, the charged part further includes at least one of the following:

[0014] The collection connector and the electrical connector for connecting the battery cells.

[0015] Optionally, it further includes: an internal heat exchange structure; wherein:

[0016] The surface of the internal heat exchange structure is adhered to the surfaces of all the battery cells via a heat-conducting medium.

[0017] Optionally, a second insulating material is coated on the outside of the surface of the battery core that is not adhered to the internal heat exchange structure, and / or a third insulating material is coated on the outside of the surface of the internal heat exchange structure that is not adhered to the battery core.

[0018] Optionally, a fourth insulating material is coated on the outside of the battery core.

[0019] Optionally, an explosion-proof valve is provided on the battery cell.

[0020] Optionally, it further includes: a bearing structure; wherein:

[0021] The battery core is arranged on the supporting structure.

[0022] Optionally, a fifth insulating material is coated on the outside of the bearing structure.

[0023] Optionally, the insulating material is a liquid insulating material.

[0024] Optionally, if the insulating material is a liquid insulating material with fluidity greater than a preset value, the potting cavity is used to allow the insulating material to be coated on the corresponding position after solidification.

[0025] A second aspect of the present application provides a battery cluster, comprising: at least one battery pack according to any one of the first aspects of the present application; wherein:

[0026] The battery pack is connected between two poles of the battery cluster.

[0027] Optionally, if the battery pack is provided with an internal heat exchange structure, the battery cluster further includes: an external heat exchange structure; wherein:

[0028] The cold end of the external heat exchange structure is connected to the cold end of the internal heat dissipation structure in the battery pack, and the hot end of the external heat exchange structure is connected to the hot end of the internal heat dissipation structure in the battery pack.

[0029] A third aspect of the present application provides an energy storage system device, comprising: a housing, at least one power conversion device, and at least one battery cluster according to any one of the second aspects of the present application; wherein:

[0030] The power conversion device and the battery cluster are both arranged inside the housing;

[0031] The first side of the power conversion device is connected to at least one of the battery clusters; the second side of the power conversion device is connected to the electrical port of the energy storage system device.

[0032] Optionally, if the battery cluster includes external heat exchange structures, all of the external heat exchange structures are integrated together.

[0033] As can be seen from the above technical solution, the present invention provides a battery pack, which specifically includes: at least one battery cell and at least one collection connector; wherein the battery cell is connected between the two poles of the battery pack and is connected to the collection connector; the exterior of the live parts in the battery pack is coated with a first insulating material; and the live parts in the battery pack include the electrodes of the battery cell. Because the exterior of the live parts in the battery pack is coated with the first insulating material, and the first insulating material can form an insulating layer between the live parts and the environment, thus isolating the live parts from the environment, the battery pack is not affected by condensation, thereby reducing the possibility of electrical safety accidents in the battery pack and improving the electrical safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0035] FIG1 is an oblique side view of an embodiment of a battery pack provided in an embodiment of the present application;

[0036] FIG2 is a schematic cross-sectional view of the battery pack shown in FIG1 ;

[0037] FIG3 is an oblique side view of another embodiment of a battery pack provided in an embodiment of the present application;

[0038] FIG4 is a schematic cross-sectional view of the battery pack shown in FIG3 ;

[0039] FIG5 is a cross-sectional schematic diagram of another embodiment of a battery pack provided in an embodiment of the present application;

[0040] FIG6 is a cross-sectional schematic diagram of another embodiment of a battery pack provided in an embodiment of the present application;

[0041] FIG7 is a schematic structural diagram of an energy storage system device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] 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.

[0043] In this application, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0044] To improve the safety performance of a battery pack, an embodiment of the present application provides a battery pack, the specific structure of which can be seen in Figures 1 and 2 . The battery pack specifically includes: at least one battery cell 10 and at least one collection connector (to simplify the diagram, Figures 1 and 2 do not show the collection connector). The connection relationship between the components is as follows:

[0045] The battery cell 10 is connected between the two poles of the battery pack, and the battery cell 10 is connected to the collection connector.

[0046] For example, as shown in Figure 1, the battery pack includes multiple battery cells 10, and all the battery cells 10 are connected in series; for another example, the battery pack includes multiple battery cells 10, and the multiple battery cells 10 are divided into two parts, and each part of the battery cells 10 are connected in series to form a series branch, and the two poles of each series branch are respectively connected to the two poles of the battery pack.

[0047] It should be noted that an explosion-proof valve can be provided on the battery cell to further improve the safety performance of the battery pack.

[0048] The data collection connector is used to collect the current, voltage and temperature of the battery cell 10 .

[0049] Optionally, the collection connector may be a component with its own insulation layer, such as a wiring harness. The collection connector may also be a component without an insulation layer, such as a copper busbar. This is not specifically limited here and may depend on the specific situation.

[0050] It should be noted that the battery pack may include a battery management unit BMU, to which the battery cell 10 is connected via an acquisition connector for monitoring the current, voltage and temperature of the battery cell 10 .

[0051] The outside of the charged part of the battery pack is coated with a first insulating material 01.

[0052] The charged part in the battery pack can be the pole of the battery cell 10; it can also be: the pole of the battery cell 10, and at least one of the following: a collecting connector, an electrical connector 20 for connecting the battery cell 10; there is no specific limitation here, and it can be determined according to the specific situation, and all are within the scope of protection of this application.

[0053] For example, as shown in FIG. 1 or FIG. 2 , the poles of the battery cell 10 and the exterior of the electrical connector 20 for connecting the battery cell 10 are coated with a first insulating material 01 .

[0054] Optionally, the electrical connector 20 for connecting the battery cells 10 can be a component with its own insulation layer, such as a wiring harness. The electrical connector 20 for connecting the battery cells 10 can also be a component without an insulation layer, such as a copper busbar. No specific limitation is made here and it depends on the specific situation.

[0055] Since the outside of the charged parts in the battery pack is coated with the first insulating material 01, and the first insulating material 01 can form an insulating layer between the charged parts in the battery pack and the environment, that is, the charged parts are isolated from the environment, the battery pack will not be affected by condensation, thereby reducing the possibility of electrical safety accidents in the battery pack, thereby improving the electrical safety performance of the battery pack.

[0056] It is worth noting that since the battery pack is not affected by condensation, the battery pack no longer needs to adopt a sealed shell design with a protection level of IP65 or above, thereby avoiding the cumbersome processing and testing processes of high-protection-level sealed shells and complex processes, that is, simplifying the design and reducing the use of overall materials, thereby reducing the overall cost of the battery pack; and, a pressure relief valve, a breathing valve and other pressure balancing structures are required to be added to the outside of the high-protection-level sealed shell to prevent the shell from rupturing, while the battery pack provided in this application does not require the above-mentioned devices, thereby further reducing its own cost.

[0057] This embodiment further provides another implementation of a battery pack, which is the same as the above implementation in this embodiment, except that: in this implementation, the outside of the battery cell 10 is coated with a fourth insulating material.

[0058] Another embodiment of the present application provides another embodiment of a battery pack. The specific structure thereof can be seen in Figures 1 to 4. Based on the above embodiment, it further includes: an internal heat exchange structure 30. The connection relationship between this device and other devices is specifically described as follows:

[0059] The surface of the internal heat exchange structure 30 is adhered to the surfaces of all the battery cells 10 via a heat-conducting medium. The internal heat exchange structure 30 is used to perform heat exchange with the battery cells 10 to cool the battery cells 10 .

[0060] For example, as shown in FIG1 , all the battery cells 10 are arranged in a rectangle, and the upper surface of the internal heat exchange structure 30 is in contact with the lower surfaces of all the battery cells 10 via a heat-conducting medium.

[0061] Optionally, the heat-conducting medium may be a heat-conducting structural adhesive or a heat-conducting pad. In practical applications, this includes but is not limited to the above, and is not specifically limited here, and all fall within the scope of protection of this application.

[0062] Optionally, the internal heat exchange structure 30 can be a liquid cooling plate, that is, the battery pack adopts liquid cooling. In practical applications, this includes but is not limited to this. For example, the internal heat exchange structure 30 is an air cooling structure. No specific limitation is made here and it can be determined according to the specific situation. It is all within the scope of protection of this application.

[0063] This embodiment also provides another embodiment of the battery pack, which is the same as the above embodiment in this embodiment, except that: in this embodiment, as shown in Figure 3 or Figure 4, the outside of the surface of the battery cell 10 that is not adhered to the internal heat exchange structure 30 is coated with a second insulating material 02, and / or the outside of the surface of the internal heat exchange structure 30 that is not adhered to the battery cell 10 is coated with a third insulating material.

[0064] Another embodiment of the present application provides another implementation of the battery pack, the specific structure of which can be seen in Figures 1 to 4. On the basis of the above implementation, it also includes: a supporting structure 40; wherein the battery cell 10 is arranged on the supporting structure 40.

[0065] This embodiment also provides another implementation of the battery pack, which is the same as the above implementation in this embodiment, except that: as shown in FIG. 5 , in this implementation, the outside of the supporting structure 40 is coated with a fifth insulating material 03 .

[0066] In any of the above embodiments, the insulating material may be a solid insulating material or a liquid insulating material, which is not specifically limited here and may be determined according to specific circumstances, and all fall within the scope of protection of this application.

[0067] If the insulating material is a liquid insulating material, the insulating material can be a liquid insulating material with fluidity greater than a preset value, or a liquid insulating material with fluidity less than a preset value. No specific limitation is made here and it can be determined according to the specific situation, and all are within the scope of protection of this application.

[0068] It should be noted that the preset value is the critical value of the fluidity of the liquid insulating material, that is, if the fluidity is greater than the preset value, it indicates that the fluidity of the liquid insulating material is strong, and if the fluidity is less than the preset value, it indicates that the fluidity of the liquid insulating material is weak.

[0069] If the insulating material is a liquid insulating material with a fluidity less than a preset value, the liquid insulating material can be directly applied to the corresponding position, and an insulating layer can be formed after solidification; if the insulating material is a liquid insulating material with a fluidity greater than a preset value, as shown in Figure 6, through the encapsulation cavity 50, the insulating material can be coated on the corresponding position after solidification, thereby forming an insulating layer.

[0070] For example, as shown in FIG. 6 , all the battery cells 10 are arranged in a rectangle, and the potting cavity 50 is disposed on the top of all the battery cells 10 .

[0071] It should be noted that the process of forming an insulating layer at the corresponding position through the potting cavity 50 is: first, the potting cavity 50 is set at the corresponding position, and then a liquid insulating material with fluidity greater than a preset value is injected into the potting cavity 50, and finally, the insulating layer can be formed after the liquid insulating material is completely solidified.

[0072] Optionally, the encapsulation cavity 50 may be a prefabricated mold or a prefabricated structural component. In practical applications, this includes but is not limited to the above. No specific limitation is made here and it may be determined according to the specific circumstances. All of these are within the scope of protection of this application.

[0073] It should be noted that the potting cavity 50 can be a detachable part, that is, the potting cavity 50 can be removed after the liquid insulating material is completely solidified; the potting cavity 50 can also be a non-detachable part, that is, the potting cavity 50 cannot be removed after the liquid insulating material is completely solidified; no specific limitation is made here, and it can be determined according to the specific circumstances, and all are within the scope of protection of this application.

[0074] Specifically, the first insulating material, the third insulating material, the fourth insulating material, and the fifth insulating material can be polyurethane potting glue, silicone rubber, UV potting glue, epoxy resin, or even hot melt potting glue; in practical applications, including but not limited to these, no specific limitations are made here, and it can be determined according to the specific circumstances, and all are within the scope of protection of this application.

[0075] Specifically, the fourth insulating material can be polyurethane potting glue or silicone rubber, UV potting glue, epoxy resin, insulating glue, blue film, or even hot melt potting glue; in practical applications, including but not limited to these, no specific limitations are made here, and it can be determined according to the specific circumstances, all within the scope of protection of this application.

[0076] Another embodiment of the present application provides a battery cluster, which specifically includes: at least one battery pack provided by the above embodiment; wherein the battery pack is connected between two poles of the battery cluster.

[0077] For example, a battery cluster includes multiple battery packs, all of which are connected in series; for another example, a battery cluster includes multiple battery packs, which are divided into two parts, and each part of the battery packs is connected in series to form a series branch, and the two poles of each series branch are respectively connected to the two poles of the battery cluster.

[0078] This embodiment also provides another implementation of the battery cluster, which is applicable to the case where an internal heat exchange structure 30 is provided in the battery pack. Based on the above implementation, this implementation also includes: an external heat exchange structure.

[0079] The cold end of the external heat exchange structure is connected to the cold end of the internal heat dissipation structure in the battery pack, and the hot end of the external heat exchange structure is connected to the hot end of the internal heat dissipation structure in the battery pack; during operation, the cooling medium exchanges heat with the external connection through the external heat exchange structure, releasing its own heat to the external connection; then, the cooling medium flows into the internal heat exchange structure 30, exchanges heat with the battery cell through the internal heat exchange structure 30, and takes away the heat of the battery cell; finally, the cooling medium flows back to the external heat exchange structure.

[0080] If the internal heat exchange structure 30 can be a liquid cooling plate, the cooling medium is a liquid cooling medium, such as water. If the internal heat exchange structure 30 can be an air-cooled heat dissipation structure, the cooling medium is air.

[0081] It should be noted that, in actual applications, the battery cluster includes a battery cluster management unit CMU, which is communicated with the BMU in the battery pack to monitor the current, voltage and temperature of the battery pack. In addition, in this embodiment, the CMU can also be communicated with the external heat exchange structure to regulate the heat exchange speed between the cooling medium and the external connection and the flow rate of the cooling medium.

[0082] In addition, the CMU can be split into a temperature control module for monitoring the temperature of the battery pack and a control module for monitoring the current and voltage of the battery pack. In practical applications, including but not limited to this differential method, no specific limitation is made here and it can be determined according to the specific situation. It is all within the scope of protection of this application.

[0083] Another embodiment of the present application provides an energy storage system device, the specific structure of which can be seen in FIG7 , specifically comprising: a housing 101 , at least one power conversion device 102 , and at least one battery cluster 103 as provided in the above embodiment of the present application; the connection relationship between the various components is specifically described as follows:

[0084] The power conversion device 102 and the battery cluster 103 are both disposed inside the housing 101 .

[0085] All battery clusters 103 may be disposed in an independent space within the housing 101, as shown in FIG7 , or may be disposed in the same space within the housing 101 as other components. This is not specifically limited here and may be determined based on specific circumstances, all of which fall within the scope of protection of this application. It is preferred that all battery clusters 103 be disposed in an independent space within the housing 101 to ensure that the battery clusters 103 and other components do not interfere with each other.

[0086] A first side of the power conversion device 102 is connected to at least one battery cluster 103 ; a second side of the power conversion device 102 is connected to an electrical port of the energy storage system device.

[0087] In practical applications, all CMUs may be integrated together or provided separately, which is not specifically limited here and may be determined according to specific circumstances, all of which fall within the scope of protection of this application.

[0088] All power conversion devices 102 and all CMUs can be arranged in an independent space within the housing 101, or they can be arranged in the same space within the housing 101 with other devices; this is not specifically limited here and can be determined according to specific circumstances, all of which are within the scope of protection of this application; it is preferred that the power conversion devices 102 and CMUs are arranged in an independent space within the housing 101 to ensure that the power conversion devices 102, CMUs and other devices do not affect each other.

[0089] If the CMU in the battery cluster 103 is split into a temperature control module and a control module, all temperature modules can be integrated into a temperature control unit, and all control modules can be integrated into a control unit; alternatively, all temperature modules and all control units can be integrated together; this is not specifically limited here and can be determined based on specific circumstances, all of which fall within the scope of protection of this application.

[0090] The temperature control unit and the control unit can be set up separately and independently, or they can be set up together in an independent control, or they can be set up in the same space with other devices. There is no specific limitation here, and it can be determined according to the specific situation, all of which are within the scope of protection of this application.

[0091] If the battery cluster 103 includes an external heat exchange structure, all external heat exchange structures can be integrated together or provided separately. This is not specifically limited here and can be determined according to the specific circumstances. All of these are within the scope of protection of this application. If all external heat exchange structures are integrated together and all temperature modules are integrated into a temperature control unit, all external heat exchange structures are integrated into the temperature control unit.

[0092] For example, as shown in Figure 7, all temperature modules are integrated into a temperature control unit 104, all external heat exchange structures are integrated into the temperature control unit 104, and all control modules are integrated into a control unit 105. The temperature control unit 104 is arranged in an independent space inside the shell 101, which can be called: a temperature control unit cabin 111; all battery clusters 103 are arranged in another independent space inside the shell 101, which can be called: a battery cabin 112; all power conversion devices 102 and control units 105 are arranged in another independent space, which can be called: a battery cabin 113.

[0093] Since the battery packs in the battery cluster 103 are those provided in the above-mentioned embodiments, and the battery packs provided in the above-mentioned embodiments are not affected by condensation, the battery packs in the energy storage system device can be removed from the shells, and the energy storage system device does not require additional equipment to maintain the air humidity in the energy storage system device within a reasonable range. Therefore, the energy storage system device reduces its own energy consumption and improves its own efficiency. In addition, the fire-fighting action of the energy storage system device is faster and the energy density is higher.

[0094] For the above description of the disclosed embodiments, the features recorded in the various embodiments in this specification can be replaced or combined with each other, so that professionals in this field can implement or use this application. The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above with a preferred embodiment, it is not used to limit the present invention. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A battery pack, characterized in that: include: at least one battery cell and at least one collection connector; The battery cell is connected between the two poles of the battery pack, and the battery cell is connected to the collection connector; The outside of the charged part in the battery pack is coated with a first insulating material; The charged parts include: electrodes of the battery cell.

2. The battery pack according to claim 1, characterized in that: The charged part further comprises at least one of the following: The collection connector is an electrical connector that realizes the connection of the battery cells.

3. The battery pack according to claim 1, characterized in that: Also includes: Internal heat exchange structure; wherein: The surface of the internal heat exchange structure is adhered to the surfaces of all the battery cells through a heat-conducting medium.

4. The battery pack according to claim 3, characterized in that: The surface of the battery core that is not adhered to the internal heat exchange structure is coated with a second insulating material, and / or the surface of the internal heat exchange structure that is not adhered to the battery core is coated with a third insulating material.

5. The battery pack according to claim 1, characterized in that: The battery core is coated with a fourth insulating material on the outside.

6. The battery pack according to claim 1, characterized in that: An explosion-proof valve is arranged on the battery core.

7. The battery pack according to claim 1, characterized in that: Also includes: Load-bearing structure; wherein: The battery core is arranged on the supporting structure.

8. The battery pack according to claim 7, characterized in that: The outside of the bearing structure is coated with a fifth insulating material.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The insulating material is a liquid insulating material.

10. The battery pack according to claim 9, characterized in that: If the insulating material is a liquid insulating material with fluidity greater than a preset value, the potting cavity is used to allow the insulating material to be coated at the corresponding position after solidification.

11. A battery cluster, characterized in that: include: At least one battery pack according to any one of claims 1 to 10; wherein: The battery pack is connected between two electrodes of the battery cluster.

12. The battery cluster according to claim 11, characterized in that: If the battery pack is provided with an internal heat exchange structure, the battery cluster further comprises: an external heat exchange structure; wherein: The cold end of the external heat exchange structure is connected to the cold end of the internal heat dissipation structure in the battery pack, and the hot end of the external heat exchange structure is connected to the hot end of the internal heat dissipation structure in the battery pack.

13. An energy storage system device, characterized in that: include: A housing, at least one power conversion device and at least one battery cluster as claimed in claim 11 or 12; wherein: The power conversion device and the battery cluster are both arranged inside the housing; The first side of the power conversion device is connected to at least one of the battery clusters; the second side of the power conversion device is connected to the electrical port of the energy storage system device.

14. The energy storage system device according to claim 13, characterized in that: If the battery cluster includes an external heat exchange structure, all of the external heat exchange structures are integrated together.

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