Energy storage device and electric device

Abstract

This application discloses an energy storage device and an electrical device. The energy storage device includes a first housing, a second housing, a battery module, and an equalization connector. The first housing has a mounting hole that penetrates the inner and outer surfaces of the first housing. The second housing is connected to the first housing, and the second housing and the first housing form a receiving cavity. The battery module is housed in the receiving cavity and includes multiple individual cells. The equalization connector is installed in the mounting hole and is electrically connected to the multiple individual cells of the battery module.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more specifically, to an energy storage device and electrical equipment including the energy storage device. Background Technology

[0002] Related technologies typically employ balancing techniques to adjust the state of multiple individual cells within a battery pack, ensuring a relatively balanced charge level among the cells and thus guaranteeing the overall performance and lifespan of the battery pack. However, the efficiency of the balancing operation in these technologies needs further improvement. Summary of the Invention

[0003] This application provides an energy storage device and electrical equipment to improve the efficiency of manual balancing to a certain extent.

[0004] The energy storage device of this application embodiment includes a first housing, a second housing, a battery module, and an equalization connector. The first housing has a mounting hole that penetrates the inner and outer surfaces of the first housing. The second housing is connected to the first housing, and the second housing and the first housing form a receiving cavity. The battery module is housed in the receiving cavity and includes multiple individual batteries. The equalization connector is installed in the mounting hole and is electrically connected to the multiple individual batteries of the battery module.

[0005] The energy storage device of this application embodiment provides an equalization connector on the first outer shell of the battery pack. The equalization connector is connected to multiple individual cells of the battery module, so that when performing manual equalization, there is no need to remove the first and second outer shells. The external equalizer can be directly connected to the equalization connector to equalize the voltage of individual cells with large voltage differences in the battery pack, which significantly improves the efficiency of manual equalization.

[0006] Optionally, an external equalizer is also included for mechanically and electrically connecting the equalization connector.

[0007] Optionally, the external equalizer is plugged into the equalization connector.

[0008] In this embodiment of the application, the external equalizer and the equalization connector are designed to be connected by a plug-in method, which facilitates the connection by the operator and can improve the equalization efficiency.

[0009] Optionally, it further includes: a battery management system and a first sampling component, the first sampling component being electrically connected to a plurality of the individual cells and electrically connected to the battery management system; wherein, the balancing connector is electrically connected to the first sampling component, and the balancing connector is arranged in parallel with the battery management system.

[0010] In the embodiments of this application, the equalization connector is electrically connected to the first sampling component, and the equalization connector is connected in parallel with the battery management system. On the one hand, the equalization connector can use the existing first sampling component of the battery pack to connect with the individual battery cells without the need to set up an additional equalization circuit, thus avoiding excessive space occupation of the battery pack and saving costs. On the other hand, the equalization connector is connected in parallel with the battery management system, and the addition of the equalization connector will not affect the battery management system's own functions and roles.

[0011] Optionally, the first sampling component includes a sampling circuit board, a plurality of first conductive sheets and a first electrical connector, one end of each first conductive sheet being electrically connected to the sampling circuit board and the other end being electrically connected to the single battery cell; one end of the first electrical connector being electrically connected to the sampling circuit board and the other end being electrically connected to the battery management system; wherein, the equalization connector is electrically connected to the first electrical connector.

[0012] In the embodiments of this application, by improving the first electrical connector, the equalization connector can be incorporated into the first sampling component, which requires minimal modification to the first sampling component and has a low modification cost.

[0013] Optionally, the first electrical connector is a flexible circuit board or a wire harness.

[0014] In the embodiments of this application, the first electrical connector is a flexible circuit board or wire harness, which facilitates adjustment of the shape and / or position of the first electrical connector to fit the space inside the battery pack.

[0015] Optionally, it further includes a battery management system, a first sampling component, and a second sampling component. The first sampling component is electrically connected to a plurality of the individual cells and is also electrically connected to the battery management system. The second sampling component is electrically connected to a plurality of the individual cells and is also electrically connected to the equalization connector.

[0016] In the embodiments of this application, the equalization connector is electrically connected to multiple individual cells through a second sampling component. The second sampling component is different from the first sampling component. Thus, the second sampling component can be designed to withstand a larger current, thereby increasing the equalization current, shortening the equalization time, and improving the equalization efficiency.

[0017] Optionally, the second sampling component includes an equalization circuit board, a plurality of second conductive sheets and a second electrical connector, one end of each second conductive sheet being electrically connected to the equalization circuit board and the other end being electrically connected to the individual battery; one end of the second electrical connector being electrically connected to the equalization circuit board and the other end being electrically connected to the equalization connector.

[0018] Optionally, the second electrical connector is a flexible circuit board or a wire harness.

[0019] In the embodiments of this application, the second electrical connector is a flexible circuit board or wire harness, which facilitates adjustment of the shape and / or position of the second electrical connector to fit the space inside the battery pack.

[0020] Optionally, it also includes a cover, which is detachably attached to the outer surface of the first housing and covers the equalization connector.

[0021] In the embodiments of this application, by providing a cover that covers the equalization connector, on the one hand, the cover can protect the equalization connector and prevent damage caused by foreign objects impacting the equalization connector; on the other hand, the cover can also prevent external dust and / or moisture from entering the equalization connector and / or the battery pack.

[0022] Optionally, the number of equalizing connectors and the number of battery modules are both multiple and equal, and the multiple equalizing connectors are electrically connected to the multiple battery modules respectively.

[0023] The electrical equipment in this application embodiment includes the energy storage device described above, which is used to supply power to the electrical equipment. Attached Figure Description

[0024] Figure 1 The diagram shown is a structural schematic of a residential energy storage system.

[0025] Figure 2 The diagram shown is an exploded view of a battery pack.

[0026] Figure 3 What is shown is Figure 2 A magnified view of the area at point X1.

[0027] Figure 4 What is shown is Figure 2 A magnified view of the area at X2 in the middle.

[0028] Figure 5 The diagram shown is a schematic of the equalization connector being integrated into the first sampling component.

[0029] Figure 6 The diagram shows the equalization connector connecting to a single cell via the second sampling component.

[0030] Figure 7 The diagram shown is a schematic diagram of the electrical equipment used in an embodiment of this application. Detailed Implementation

[0031] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0032] It is understood that the terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0033] Since the energy people need is highly time- and space-dependent, in order to make rational use of energy and improve energy efficiency, it is necessary to use a medium or device to store one form of energy in the same way or by converting it into another form of energy, and then release it in a specific form of energy based on future application needs.

[0034] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0035] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, enabling load matching of electrical energy in time and space, enhancing the absorption capacity of renewable energy, and playing a significant role in grid system backup, alleviating peak load power supply pressure, and peak regulation and frequency regulation.

[0036] (2) Small and medium-sized energy storage cabinets used in commercial and industrial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in residential energy storage scenarios primarily operate under the "peak shaving and valley filling" mode. Because there are significant price differences in electricity consumption during peak and off-peak periods, users with energy storage devices typically charge the cabinets / boxes during off-peak hours to reduce costs; during peak hours, they release the stored electricity for use, thus saving on electricity bills. Furthermore, in remote areas and regions prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices effectively provides backup power for users and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0037] This explanation will take the residential energy storage scenario in user-side energy storage as an example. Figure 1A residential energy storage system is illustrated, comprising an energy storage device 1, a power conversion device 2 (such as a photovoltaic panel), and user loads 3 (such as streetlights, household appliances, etc.). The energy storage device 1 is a small energy storage box that can be wall-mounted to an outdoor wall. Specifically, the power conversion device 2 can convert solar energy into electrical energy during periods of low electricity prices and store it through the energy storage device 1, then supply it to the user loads 3 during periods of high electricity prices, or supply it to the user loads 3 during power outages / power interruptions.

[0038] In conjunction with the aforementioned energy storage methods using physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 1 includes at least one set of chemical batteries. The chemical elements within these batteries serve as the energy storage medium, and the charging and discharging process is achieved through the chemical reactions or changes in the storage medium. Simply put, electrical energy generated from solar or wind power is stored in at least one set of chemical batteries through the chemical reactions or changes in the storage medium. When external power consumption reaches its peak, the stored energy is released through the chemical reactions or changes in the storage medium for use, or transferred to areas with power shortages.

[0039] This application provides an energy storage device 1, which may be, but is not limited to, a battery pack, an energy storage box, or an energy storage system. The following description uses a battery pack as an example of the energy storage device 1.

[0040] like Figure 2 As shown, the energy storage device 1 in this application embodiment includes a first housing 110, a second housing 120, a battery module 200, and a battery management system 510 (BMS).

[0041] The first outer shell 110 and the second outer shell 120 are connected, and the first outer shell 110 and the second outer shell 120 form a receiving cavity 130, in which the battery module 200 and the battery management system 510 are housed. To ensure the sealing of the receiving cavity 130, a sealing element may be provided at the connection between the first outer shell 110 and the second outer shell 120.

[0042] The shape in which the first outer shell 110 and the second outer shell 120 are connected can be determined according to the shape of the battery module 200. For example, in the embodiment of this application, the first outer shell 110 and the second outer shell 120 are connected to form a hollow cuboid, but this is not a limitation.

[0043] As an example, both the first housing 110 and the second housing 120 are cuboid in shape and each has an opening on one side. The opening of the first housing 110 is opposite to the opening of the second housing 120, and the first housing 110 and the second housing 120 are connected to form a receiving cavity 130 for accommodating the battery module 200 and the battery management system 510.

[0044] Of course, in other embodiments, the first outer shell 110 is a cuboid with an opening, and the second outer shell 120 is plate-shaped. The second outer shell 120 is fastened to the opening of the first outer shell 110 so that the first outer shell 110 and the second outer shell 120 form a receiving cavity 130 for accommodating the battery module 200 and the battery management system 510.

[0045] In one embodiment, the first housing 110 and the second housing 120 may be connected by bolts, but this is not a limitation. For example, the first housing 110 and the second housing 120 may also be connected by riveting.

[0046] Please continue reading. Figure 2 The battery module 200 is housed within the receiving cavity 130. This application does not limit the number of battery modules 200; for example, there can be one or more battery modules 200, where "multiple" refers to two or more. For ease of explanation, the length direction of the battery module 200 is defined as the first direction D1, the width direction as the second direction D2, and the height direction as the third direction D3. In this embodiment, the number of battery modules 200 is two, and the two battery modules 200 are arranged side-by-side along the second direction D2.

[0047] The battery module 200 includes multiple individual battery cells 210, which are arranged side-by-side along a first direction D1. Each individual battery cell 210 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc. The individual battery cell 210 can be cylindrical, flat, cuboid, etc., and this application does not impose any limitations on its shape.

[0048] The battery module 200 includes multiple individual battery cells 210 that can be connected in series, parallel, or a hybrid connection. A hybrid connection refers to a connection that includes both series and parallel connections. Of course, when there are multiple battery modules 200, they can be connected in series, parallel, or a hybrid connection.

[0049] The battery module 200 may also include two end plates 220, which are respectively disposed on both sides of the plurality of individual cells 210 along the first direction D1.

[0050] like Figure 2As shown, the first housing 110 may include a base plate 111, two first side plates 112, and two second side plates 113. The base plate 111 is disposed at the bottom of the battery module 200. The two first side plates 112 are disposed opposite each other along a second direction D2 and are respectively connected to both sides of the base plate 111 along the second direction D2. The two second side plates 113 are disposed opposite each other along a first direction D1 and are respectively connected to both sides of the base plate 111 along the first direction D1, and each second side plate 113 is connected to the two first side plates 112 at both ends along the second direction D2. The two second side plates 113 are located on opposite sides of the two end plates 220 along the first direction D1.

[0051] It is understood that the energy storage device 1 in this embodiment may further include a cold plate, which may be disposed at the bottom or top of the battery module 200. Alternatively, cold plates may be disposed at both the bottom and top of the battery module 200. The cold plate can exchange heat with the heat generated by the battery module 200 to improve the performance and safety of the energy storage device 1.

[0052] The cold plate can be a liquid-cooled plate or a direct-cooled plate, and this application does not limit it.

[0053] Please continue reading. Figure 2 The battery management system 510 is disposed within the receiving cavity 130 formed by the first housing 110 and the second housing 120. Of course, in other embodiments, the battery management system 510 may also be disposed outside the receiving cavity 130. In this embodiment, the battery management system 510 is disposed between the corresponding end plate 220 and the second side plate 113.

[0054] A battery management system 510 is a device or system used to monitor and control a battery module 200. It is a critical component in battery applications, designed to ensure the safety, performance, and lifespan of the battery module 200. A battery management system 510 typically includes the following functions and components:

[0055] Battery Monitoring and Measurement: The BMS monitors various parameters of the battery module 200 in real time, such as voltage, current, and temperature, using sensors or other measuring devices. This monitoring data can be used to assess the battery's status, health condition, and performance.

[0056] Balance control: The BMS can control the charging and discharging differences between individual cells in the battery module 200 through balancing methods, such as passive balancing, active balancing or dynamic balancing, in order to maintain the balanced state of the battery module 200.

[0057] Charge and discharge control: The BMS can monitor and control the charging and discharging process of the battery module 200 to prevent overcharging or over-discharging and ensure the safety and effectiveness of charging and discharging.

[0058] Temperature Management: The BMS can monitor and control the temperature of the battery module 200. When the temperature exceeds the safe range, measures can be taken to dissipate heat or reduce the charging and discharging rate to protect the safety and lifespan of the battery module 200.

[0059] Fault Diagnosis and Protection: The BMS can detect faults or abnormalities in the battery module 200 and take protective measures, such as disconnecting circuits and issuing alarms. It can also record and analyze fault data to facilitate fault diagnosis and preventative measures.

[0060] Communication and Data Management: The BMS can communicate with external systems or devices, such as vehicle control systems and energy management systems. It can provide real-time data transmission, monitoring, and remote control functions to support system integration and management.

[0061] First, it's important to clarify that battery balancing refers to adjusting the charge levels of each individual cell 210 within a battery module 200, composed of multiple individual cells 210, to achieve a relatively balanced state. This is because during use, inconsistencies between individual cells 210, such as differences in internal resistance and capacity, can lead to uneven charging and discharging, thus reducing the performance and lifespan of the battery module 200. Battery balancing resolves these internal imbalances within the battery module 200, improving its overall performance and lifespan, ensuring normal operation, and reducing the risk of battery failure.

[0062] Existing battery equalization methods are generally divided into passive equalization and active equalization, with passive equalization being one of the simplest. It achieves this by connecting an equalization resistor in series with each battery. When the voltage of one battery is higher than that of the others, the excess charge flows through the equalization resistor, reducing the voltage of that battery to the same level as the others. Passive equalization is relatively simple, but its efficiency is low.

[0063] Active balancing is a more complex balancing method that uses circuitry or electronics to actively regulate the state of charge and discharge of each battery. A common active balancing method uses switched capacitors to achieve balancing by transferring charge from higher-voltage batteries to lower-voltage batteries.

[0064] like Figure 2 and Figure 3 As shown, the energy storage device 1 in this embodiment further includes a first sampling component 520, which is electrically connected to multiple individual battery cells 210 and to a battery management system 510. The battery management system 510 can monitor various parameters of the battery module 200 in real time, such as voltage, current, and temperature, through the first sampling component 520.

[0065] In one embodiment, the first sampling component 520 includes a sampling circuit board 521, a plurality of first conductive sheets 522, and a first electrical connector 523. The sampling circuit board 521 can be disposed on top of the battery module 200. One end of each first conductive sheet 522 is electrically connected to the sampling circuit board 521, and the other end is electrically connected to a single battery cell 210. One end of the first electrical connector 523 is electrically connected to the sampling circuit board 521, and the other end of the first electrical connector 523 is electrically connected to the battery management system 510.

[0066] The first conductive sheet 522 can be electrically connected to the individual battery 210 via the busbar 230. In detail, the battery module 200 includes multiple individual batteries 210 connected through multiple busbars 230. One busbar 230 is welded to the adjacent positive and negative electrodes of two adjacent individual batteries 210, and the first conductive sheet 522 is welded to the busbar 230.

[0067] It is understood that the sampling circuit board 521 can be a rigid circuit board or a flexible circuit board, and this application does not limit it.

[0068] The sampling circuit board 521 and the first electrical connector 523, as well as the first electrical connector 523 and the battery management system 510, can be connected by a connector assembly, which facilitates disassembly and assembly.

[0069] In one embodiment, the first electrical connector 523 can be a circuit board or a wire harness. When the first electrical connector 523 is a circuit board, the circuit board can be a flexible circuit board. The flexible circuit board or wire harness of the first electrical connector 523 facilitates adjustment of its shape and / or position to fit within the space of the battery pack.

[0070] It should be noted that in related technologies, when manually balancing the battery pack, the first outer shell 110 and the second outer shell 120 of the battery pack need to be removed, and the first electrical connector 523 needs to be removed from the battery management system 510. Manual balancing is then performed using the existing first sampling component 520 of the battery pack (including the sampling circuit board 521, the first conductive sheet 522, and the first electrical connector 523). On the one hand, due to limitations in the current carrying capacity of the first sampling component 520 (e.g., connector assemblies and wiring harnesses have low current carrying capacity), the first sampling component 520 can only handle a small current value during voltage balancing. When dealing with battery packs with large capacities, the balancing time will be very long. On the other hand, since balancing requires disassembling and reassembling the first outer shell 110, the second outer shell 120, the first electrical connector 523, and the battery management system 510, the disassembly and reassembly time consumes a significant amount of balancing time, which is detrimental to improving balancing efficiency. Furthermore, frequent disassembly and reassembly can affect the airtightness between the first outer shell 110 and the second outer shell 120, thereby affecting the reliability of the battery pack.

[0071] Based on this, this application provides an energy storage device 1 that can improve the efficiency of manual balancing. For example... Figure 4 As shown, the first housing 110 has a mounting hole 110a that penetrates both the inner and outer surfaces of the first housing 110. The inner surface refers to the surface facing the battery module 200, and the outer surface refers to the surface facing away from the battery module 200. The equalization connector 300 is mounted within the mounting hole 110a and is electrically connected to multiple individual battery cells 210 of the battery module 200.

[0072] The energy storage device 1 of this application embodiment provides an equalization connector 300 on the first outer shell 110 of the battery pack. The equalization connector 300 is connected to multiple individual cells 210 of the battery module 200. This allows for manual equalization without removing the first outer shell 110 and the second outer shell 120. The external equalizer 400 can be directly connected to the equalization connector 300 to equalize the voltage of individual cells 210 with large voltage differences within the battery pack, significantly improving the efficiency of manual equalization.

[0073] like Figure 2 and Figure 4 As shown, mounting hole 110a is provided on one of the second side plates 113 of the first housing 110, and mounting hole 110a penetrates the second side plate 113 along the first direction D1.

[0074] The number of equalizing connectors 300 and the number of battery modules 200 can both be multiple and equal, with multiple equalizing connectors 300 correspondingly electrically connected to multiple battery modules 200. That is, multiple individual cells 210 included in the battery module 200 electrically connected to the equalizing connector 300 can be equalized through one equalizing connector 300.

[0075] In practical applications, when the battery management system 510 detects that the voltage of a certain single cell 210 is too high, it can find the equalization connector 300 corresponding to the single cell 210 through the interface definition. Then, the external equalizer 400 connects to the equalization connector 300 to perform voltage equalization so that the voltage difference of multiple single cells 210 is kept basically consistent. Finally, the battery pack is charged as a whole.

[0076] Of course, in other embodiments, the energy storage device 1 may also be provided with only one equalization connector 300, and the equalization connector 300 is electrically connected to the individual battery cells 210 included in the multiple battery modules 200.

[0077] In one embodiment, the energy storage device 1 further includes an external equalizer 400 (e.g., Figure 5 and Figure 6 ), a balanced connector 300 for mechanical and electrical connections.

[0078] An external equalizer 400 is a device used to equalize the voltage of individual cells 210 within a battery pack. The external equalizer 400 is typically independent of the battery pack and can be installed separately next to the battery pack or in another suitable location. The function of the external equalizer 400 is to monitor and adjust the voltage differences between the different individual cells 210 in the battery pack to ensure that the state of charge of each individual cell 210 remains balanced. Through the external equalizer 400, the charging and discharging process of each individual cell 210 in the battery pack can be precisely controlled, avoiding problems caused by uneven charging and discharging of some individual cells 210, such as capacity imbalance and shortened lifespan. The external equalizer 400 typically has multiple channels, each corresponding to one individual cell 210, and achieves its equalization function by monitoring voltage differences and the release / absorption of charge.

[0079] In one embodiment, the external equalizer 400 is plugged into the equalizer connector 300. Designing the external equalizer 400 and equalizer connector 300 to connect via a plug-in connection facilitates connection by the operator and thus improves equalization efficiency.

[0080] like Figure 5 As shown, as an example, the equalization connector 300 is electrically connected to the first sampling component 520, and the equalization connector 300 is connected in parallel with the battery management system 510. It should be noted that... Figure 5 The diagram is intended to show the connection between the equalization connector 300 and the first sampling component 520. The four individual cells 210 shown in the diagram should not be interpreted as the battery module 200 consisting of only four individual cells 210.

[0081] In this embodiment, the equalization connector 300 is electrically connected to the first sampling component 520, and the equalization connector 300 is connected in parallel with the battery management system 510. On the one hand, the equalization connector 300 can be connected to the individual battery 210 using the existing first sampling component 520 in the battery pack, without the need to set up an additional equalization circuit, thus avoiding excessive space occupation in the battery pack and saving costs. On the other hand, the equalization connector 300 is connected in parallel with the battery management system 510, and the addition of the equalization connector 300 will not affect the battery management system 510's own functions and roles.

[0082] As an example, the equalization connector 300 can be electrically connected to the first electrical connector 523. For instance, when the first electrical connector 523 is a wire harness, it can include a main path and two branch paths, with the two branch paths connected in parallel and one end of each branch path connected to one end of the main path. The other end of the main path can be provided with a connector for connection to the sampling circuit board 521, and the other end of each branch path can be provided with a connector so that the two branch paths can be connected to the battery management system 510 and the equalization connector 300, respectively.

[0083] In this embodiment of the application, by improving the first electrical connector 523, the equalization connector 300 can be incorporated into the first sampling component 520, which requires minimal modification to the first sampling component 520 and has a low modification cost.

[0084] like Figure 6 As shown, in a modified embodiment, the equalization connector 300 may not be connected to the first sampling component 520, but instead connected to the single battery cell 210 via the second sampling component 540. The first sampling component 520 and the second sampling component 540 are different.

[0085] In detail, the energy storage device 1 also includes a second sampling component 540, which is electrically connected to a plurality of individual cells 210 and electrically connected to an equalization connector 300.

[0086] In this embodiment of the application, the equalization connector 300 is electrically connected to multiple individual battery cells 210 through the second sampling component 540. The second sampling component 540 is different from the first sampling component 520. Thus, the second sampling component 540 can be designed to withstand a larger current, thereby increasing the equalization current, shortening the equalization time, and improving the equalization efficiency.

[0087] Please continue reading. Figure 6 In one embodiment, the second sampling component 540 may include an equalization circuit board 541, a plurality of second conductive sheets 542, and a second electrical connector 543. The equalization circuit board 541 may be disposed on top of the battery module 200, and further, the equalization circuit board 541 and the sampling circuit board 521 may be stacked. One end of each second conductive sheet 542 is electrically connected to the equalization circuit board 541, and the other end of each second conductive sheet 542 is electrically connected to the individual battery cell 210. One end of the second electrical connector 543 is electrically connected to the equalization circuit board 541, and the other end is electrically connected to the equalization connector 300.

[0088] The second conductive sheet 542 can be connected to the single cell 210 via the busbar 230.

[0089] It is understood that the equalization circuit board 541 can be a rigid circuit board or a flexible circuit board, and this application does not limit it.

[0090] The equalization circuit board 541 and the second electrical connector 543, as well as the second electrical connector 543 and the equalization connector 300, can be connected by a connector assembly, which facilitates disassembly and assembly.

[0091] In one embodiment, the second electrical connector 543 is a circuit board or a wiring harness. When the second electrical connector 543 is a circuit board, the circuit board can be a flexible circuit board. The flexible circuit board or wiring harness of the second electrical connector 543 facilitates adjustment of its shape and / or position to fit within the space of the battery pack.

[0092] Please return to the reference. Figure 2 The energy storage device 1 also includes a cover 600, which is detachably connected to the outer surface of the first housing 110 and covers the equalization connector 300. When voltage equalization of the individual cells in the battery pack is not required, the cover 600 is connected to the outer surface of the first housing 110 and covers the equalization connector 300. When voltage equalization of the individual cells in the battery pack is required, the cover 600 can be removed.

[0093] In the embodiments of this application, by providing a cover 600 that covers the equalization connector 300, on the one hand, the cover 600 can protect the equalization connector 300 and prevent damage caused by external objects impacting the equalization connector 300; on the other hand, the cover 600 can also prevent external dust and / or moisture from entering the equalization connector 300 and / or the battery pack.

[0094] like Figure 7 As shown, this application also provides an electrical device 4, which includes the energy storage device 1 described in the above embodiments, and the energy storage device 1 supplies power to the electrical device 4.

[0095] Among them, electrical equipment 4 may include, but is not limited to: vehicles, household appliances, industrial equipment, etc.

[0096] It is understood that the various embodiments / implementations provided in this application can be combined with each other without creating contradictions, and will not be described one by one here.

[0097] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0098] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the application.

[0099] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the claims. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0100] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application examples.

Claims

1. An energy storage device, characterized in that, include: A first housing has mounting holes that penetrate the inner and outer surfaces of the first housing; A second outer shell is connected to the first outer shell, and the second outer shell and the first outer shell form a receiving cavity; A battery module is housed within the receiving cavity and includes multiple individual battery cells; An equalization connector is installed in the mounting hole and electrically connected to multiple individual cells of the battery module; The equalization connector is used for mechanical and electrical connection with an external equalizer; Battery management system; The first sampling component includes a sampling circuit board, a plurality of first conductive sheets, and a first electrical connector. One end of each first conductive sheet is electrically connected to the sampling circuit board, and the other end is electrically connected to the individual battery cell. The first electrical connector includes a main circuit and two parallel branch circuits. One end of the main circuit is provided with a first connector for electrical connection to the sampling circuit board. The other end of the main circuit is electrically connected to one end of each of the two branch circuits. The other ends of the two branch circuits are respectively provided with second connectors for electrical connection to the battery management system and the equalization connector.

2. The energy storage device according to claim 1, characterized in that, It also includes an external equalizer for mechanically and electrically connecting the equalizer connector.

3. The energy storage device according to claim 2, characterized in that, The external equalizer is plugged into the equalization connector.

4. The energy storage device according to claim 1, characterized in that, The first electrical connector is a flexible circuit board or wire harness.

5. The energy storage device according to claim 1, characterized in that, Also includes: The cover is detachably attached to the outer surface of the first housing and covers the equalization connector.

6. The energy storage device according to claim 1, characterized in that, The number of equalizing connectors and the number of battery modules are both multiple and equal, and the multiple equalizing connectors are electrically connected to the multiple battery modules respectively.

7. An electrical appliance, characterized in that, The device includes the energy storage device according to any one of claims 1 to 6, wherein the energy storage device is used to supply power to the electrical equipment.

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