Battery pack and energy storage device

Abstract

The application relates to the technical field of battery manufacturing, and provides a battery pack and an energy storage device. The battery pack provided by the application comprises a tray assembly and a battery cell module. The tray assembly comprises a bottom plate and a frame arranged on the bottom plate. The battery cell module is arranged in a placing groove formed by the bottom plate and the frame. The bottom plate comprises a plurality of spliced units arranged in sequence along the width direction. The spliced units are spliced together in sequence, and each spliced unit corresponds to at least one battery cell module. The battery pack provided by the application can adjust the size of the bottom plate, is compatible with the requirements of different energy densities, and is conducive to reducing the manufacturing cost of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery pack and energy storage device. Background Technology

[0002] With the development of new energy technologies, in order to match the energy density requirements of different battery packs, the size of the battery pack casing will be adjusted accordingly to adapt to the energy density requirements of different battery packs.

[0003] The lower casing of existing battery packs generally includes side beams and a base plate. When the size of the battery pack casing is adjusted, the base plate is usually made as a single piece. When the size of the base plate needs to be adjusted accordingly, it is often necessary to re-make the mold, which increases the manufacturing cost of the base plate and is not conducive to reducing the manufacturing cost of the battery pack. Utility Model Content

[0004] In view of this, the present application aims to provide a battery pack and energy storage device to reduce the manufacturing cost of the battery pack.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A battery pack, comprising a tray assembly and a cell module; The tray assembly includes a base plate and a frame disposed on the base plate, and the battery cell module is placed in a placement groove formed by the base plate and the frame. The base plate has a plurality of splicing units arranged sequentially along the width direction. Each splicing unit is welded together sequentially, and each splicing unit corresponds to at least one of the battery cell modules.

[0006] Furthermore, the splicing unit includes two substrates arranged opposite each other, and a plurality of reinforcing ribs disposed between the two substrates, with each reinforcing rib being arranged at intervals along the width direction; and / or, both the splicing unit and the frame are made of aluminum profiles.

[0007] Furthermore, the splicing unit is provided with a number of venting holes, and each venting hole is configured to correspond one-to-one with the explosion-proof valve of each battery cell on the battery cell module.

[0008] Furthermore, the battery cell module includes side plates arranged opposite each other along the width direction, and a plurality of battery cell units disposed between the two side plates, wherein each battery cell unit is stacked sequentially along the length direction.

[0009] Furthermore, the battery cell modules are multiple modules arranged along the width direction, and two adjacent battery cell modules share one side plate.

[0010] Furthermore, the side plate is a cold plate; and / or, the battery cell module is glued to the base plate.

[0011] Furthermore, the frame has a front beam; the front beam is provided with at least one of the following: a high-pressure interface, a low-pressure interface, a battery pack explosion-proof valve, a cold plate liquid inlet / outlet interface, an MSD, and a fire-fighting interface.

[0012] Furthermore, it also includes a battery pack cover disposed on the tray assembly, a battery compartment corresponding to the placement slot being formed between the tray assembly and the battery pack cover, and an electrical compartment located in front of the battery compartment along the length direction; the battery pack cover is provided with a maintenance opening corresponding to the electrical compartment, and a detachable maintenance cover plate disposed at the maintenance opening.

[0013] Furthermore, it also includes a BMS; the BMS is located on the side of the maintenance cover facing the electrical compartment.

[0014] Compared with related technologies, this application has the following advantages: (1) The battery pack described in this application can achieve modular production by setting splicing units. The number and length of splicing boards can be increased or decreased according to the number of cell modules. That is, the size of the base plate can be increased or decreased by increasing or decreasing the number of splicing units, thereby meeting the requirements of different energy densities of the battery pack. At the same time, there is no need to re-open the mold, which is conducive to cost reduction.

[0015] (2) By setting the reinforcing ribs between the substrates, the structural strength of the base plate is enhanced, which is conducive to the lightweight design of the base plate. At the same time, the splicing unit and the frame are made of aluminum profiles, which is conducive to the lightweight design of the base plate.

[0016] (3) By setting the exhaust port, it can cooperate with the cell explosion-proof valve to form a pressure relief channel. The exhaust port and the cell explosion-proof valve are set one-to-one, which can individually relieve the pressure of each cell in a specific direction and avoid the chain reaction caused by thermal runaway.

[0017] (4) By making the battery cell module include a side plate and several individual battery cells, the structure is simple, easy to process and assemble, and easy to adapt to different energy density requirements.

[0018] (5) By sharing a side plate between two adjacent battery cell modules, it is beneficial to reduce material costs and contribute to the lightweight design of the battery pack.

[0019] (6) By making the side plate a cold plate, it is beneficial to heat dissipation of the cell, which helps to improve the performance of the cell and thus improve the quality of the battery pack. At the same time, the cell module is glued to the base plate, which is convenient for assembly and design implementation.

[0020] (7) By arranging at least one of the high-pressure interface, low-pressure interface, battery pack explosion-proof valve, cold plate liquid inlet / outlet interface, MSD and fire-fighting interface on the front beam, maintenance is facilitated and design implementation is made easier.

[0021] (8) By designing the battery compartment and the electrical compartment separately, it is easy to isolate the cell module and the electrical components, avoid mutual interference, and facilitate the maintenance of the internal structure of the battery pack through the setting of maintenance openings and maintenance covers, which is conducive to design implementation.

[0022] (9) By placing the BMS on the maintenance cover, it is convenient to maintain and assemble the BMS. The structure is simple and easy to design and implement.

[0023] This application also proposes an energy storage device, including the battery pack described above.

[0024] The energy storage device described in this application has the same beneficial effects as the battery pack described above compared to the prior art, so it will not be described again here. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the battery pack structure described in an embodiment of this application; Figure 2 This is a schematic diagram of the tray assembly and cell module of the battery pack described in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the tray assembly described in the embodiments of this application; Figure 4 This is a schematic diagram of the internal structure of the base plate described in the embodiments of this application; Explanation of reference numerals in the attached figures: 1. Pallet assembly; 101. Base plate; 102. Frame; 103. Placement slot; 104. Vent hole; 1011. Substrate; 1012. Reinforcing rib; 2. Battery cell module; 201. Single battery cell; 202. Side plate; 3. High-pressure interface; 4. Low-pressure interface; 5. Battery pack explosion-proof valve; 6. Cold plate inlet / outlet interface; 7. MSD; 8. Fire protection interface; 9. Battery pack cover; 901. Maintenance opening; 902. Maintenance cover plate. Detailed Implementation

[0026] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0028] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0030] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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 this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0032] An embodiment of the first aspect of this application provides a battery pack that is used in an energy storage device, mainly for storing and releasing electrical energy. The battery pack in this embodiment, with its innovative structural design, can adapt to the needs of different energy densities, thereby helping to reduce the manufacturing cost of the battery pack.

[0033] In related technologies, with the development of new energy technologies, in order to match the energy density requirements of different battery packs, the size of the battery pack casing will be adjusted accordingly to adapt to the energy density requirements of different battery packs.

[0034] The lower casing of existing battery packs generally includes side beams and a base plate. When the size of the battery pack casing is adjusted, the base plate is usually made as a single piece. When the size of the base plate needs to be adjusted accordingly, it is often necessary to re-make the mold, which increases the manufacturing cost of the base plate and is not conducive to reducing the manufacturing cost of the battery pack.

[0035] In view of this, in order to overcome the shortcomings of the related technology, the battery pack of this embodiment combines... Figures 1 to 3 As shown, the overall design includes a tray assembly 1 and a battery cell module 2.

[0036] The tray assembly 1 includes a base plate 101 and a frame 102 disposed on the base plate 101. The battery cell module 2 is placed in the placement groove 103 formed by the base plate 101 and the frame 102. The base plate 101 has a plurality of splicing units arranged sequentially along the width direction. Each splicing unit is welded together sequentially, and each splicing unit corresponds to at least one battery cell module 2.

[0037] Therefore, by setting up splicing units, modular production can be achieved. The number and length of splicing boards can be increased or decreased according to the number of battery cell modules 2. In other words, the size of the base plate 101 can be increased or decreased by increasing or decreasing the number of splicing units, thereby making it compatible with the needs of different energy densities of battery packs. At the same time, there is no need to re-open molds, which helps to reduce costs.

[0038] Based on the above general introduction, specifically, the battery pack in this embodiment generally includes a tray assembly 1 and a cell module 2.

[0039] The pallet assembly 1 includes a base plate 101 and a frame 102 disposed on the base plate 101. In a specific implementation, the base plate 101 may be rectangular, and the shape of each splicing unit is also rectangular. The frame 102 follows the shape of the base plate 101, and the frame 102 includes four side beams connected end to end in sequence, each side beam being a cuboid beam structure.

[0040] The above splicing unit combination method can be the existing splicing unit combination method (such as welding method, etc.), as long as it can meet the structural strength requirements of the base plate 101 after assembly. When changing the size of the base plate 101 by adding or removing splicing units, the size of each side beam is adjusted accordingly. Since each side beam is a cuboid beam structure, only the length of each side beam needs to be adjusted when adjusting the size of each side beam.

[0041] Continue to combine Figures 1 to 4As shown, in some exemplary embodiments, this embodiment may, for example, include a splicing unit comprising substrates 1011 arranged vertically opposite each other.

[0042] Among them, a number of reinforcing ribs 1012 are provided between the two base plates 1011, and the reinforcing ribs 1012 are arranged sequentially at intervals along the width direction of the base plate 101. Furthermore, the splicing unit and the frame 102 are all made of aluminum profiles.

[0043] It is understandable that by setting the reinforcing ribs 1012 between the substrates 1011, the structural strength of the base plate 101 is enhanced, and the lightweight design of the base plate 101 is facilitated. At the same time, the splicing unit and the frame 102 are both made of aluminum profiles, which is also beneficial to the lightweight design of the base plate 101.

[0044] In specific implementation, the above substrate 1011 and splicing unit can be integrally formed, and each reinforcing rib 1012 can extend from one end of the splicing unit to the other end, or it can be arranged in segments, as long as it can meet the structural strength requirements of the splicing unit.

[0045] Continue to combine Figures 1 to 4 As shown, in some exemplary embodiments, this embodiment may, for example, provide a plurality of exhaust holes 104 on the splicing unit.

[0046] Each vent hole 104 is configured to correspond one-to-one with the explosion-proof valve of each battery cell on the battery cell module 2.

[0047] It is understandable that by setting the exhaust port 104, it can cooperate with the cell explosion-proof valve to form a pressure relief channel. Moreover, the exhaust port 104 and the cell explosion-proof valve are set one-to-one, which can individually and directionally relieve pressure on each cell to avoid chain reactions caused by thermal runaway.

[0048] In specific implementation, the shape of the exhaust hole 104 on the above splicing unit matches the shape of the cell explosion-proof valve, and when the exhaust hole 104 and the reinforcing rib 1012 of the above splicing unit are set at the same time, the exhaust hole 104 is preferably set between two adjacent reinforcing ribs 1012.

[0049] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, this embodiment may, for example, include side plates 202 arranged opposite each other along the width direction of the base plate 101, and a plurality of individual battery cells 201 disposed between the side plates 202, with each individual battery cell 201 stacked sequentially along the length direction. It is understandable that by making the battery module 2 include a side plate 202 and several battery cells 201, the structure is simple, easy to process and assemble, and easy to adapt to different energy density requirements.

[0050] In practical implementation, each individual battery cell 201 is stacked face-to-face along the length of the base plate 101 to form a battery cell assembly, and side plates 202 are arranged on both sides of the battery cell assembly along the width of the base plate 101. The battery cells and side plates 202 mentioned above can be referenced from the battery cells and side plates 202 in the existing battery cell module 2, and will not be described in detail here.

[0051] Furthermore, the connection method between the above-mentioned individual battery cells 201 can also refer to the connection method of the existing individual battery cells 201 in the battery cell module 2, and will not be elaborated here.

[0052] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, the battery cell module 2 still includes side plates 202 arranged opposite each other along the width direction. In this embodiment, for example, the battery cell module 2 can be a plurality of battery cell modules arranged along the width direction of the base plate 101, with two adjacent battery cell modules 2 sharing one side plate 202.

[0053] It is understandable that by having two adjacent battery cell modules 2 share a side plate 202, it is beneficial to reduce material costs and facilitate the lightweight design of the battery pack.

[0054] In practice, each side plate 202 is arranged at intervals on the base plate 101, and a receiving groove for placing the battery cell is formed between adjacent side plates 202, with each battery cell 201 arranged in the corresponding receiving groove.

[0055] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, the battery cell module 2 includes side plates 202 arranged opposite each other along the width direction. In this embodiment, for example, the side plates 202 can be cold plates, and the battery cell module 2 and the base plate 101 can be glued together.

[0056] It is understandable that by making the side plate 202 a cold plate, it is beneficial to heat dissipation of the battery cell, which helps to improve the performance of the battery cell and thus improve the quality of the battery pack. At the same time, the battery cell module 2 is glued to the base plate 101, which facilitates assembly and design implementation.

[0057] In specific implementation, the liquid inlet and liquid outlet of the upper side plate 202 are preferably arranged on the same side to facilitate the arrangement of the coolant flow pipeline. The upper side plate 202 can be based on the cold plate in the existing battery pack, and will not be described in detail here.

[0058] Continue to combine Figures 1 to 3 As shown, in some of the exemplary embodiments, this embodiment may, for example, have a front beam for the frame 102.

[0059] The front beam is equipped with at least one of the following: high-pressure interface 3, low-pressure interface 4, battery pack explosion-proof valve 5, cold plate liquid inlet / outlet interface 6, MSD7 (Manual Service Disconnect) and fire-fighting interface 8.

[0060] It is understandable that arranging at least one of the high-pressure interface 3, low-pressure interface 4, battery pack explosion-proof valve 5, cold plate liquid inlet / outlet interface 6, MSD7 and fire-fighting interface 8 on the front beam facilitates maintenance and design implementation.

[0061] In practical implementation, the high-voltage interface 3, the pressure-resistant interface, the battery pack explosion-proof valve 5, the cold plate inlet / outlet interface 6, the MSD7, and the fire-fighting interface 8 are all located on the front beam. The high-voltage interface 3 can be, for example, a high-voltage socket, and the low-voltage interface 4 can be, for example, a low-voltage socket. The MSD7 is a high-voltage connector with a fuse. The high-voltage interface 3, the pressure-resistant interface, the battery pack explosion-proof valve 5, the cold plate inlet / outlet interface 6, the MSD7, and the fire-fighting interface 8 can all be derived from existing battery pack structures and will not be elaborated further here.

[0062] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, this embodiment may, for example, include a battery pack cover 9 disposed on the tray assembly 1.

[0063] The battery compartment, which is formed by the tray assembly 1 and the battery pack cover 9, is located in front of the battery compartment along the length of the base plate 101. The battery pack cover 9 is provided with a maintenance opening 901 corresponding to the electrical compartment and a maintenance cover 902 that is detachably provided at the maintenance opening 901.

[0064] It is understandable that by designing the battery compartment and the electrical compartment separately, it is beneficial to isolate the cell module 2 and the electrical components, avoid mutual interference, and facilitate the maintenance of the internal structure of the battery pack through the setting of maintenance opening 901 and maintenance cover 902, which is conducive to the design implementation.

[0065] In practical implementation, the maintenance cover 902 can be hinged to the battery pack cover 9 and bolted to it to close the maintenance opening 901. When it needs to be opened, the bolts can be removed. The connection between the tray assembly 1 and the battery pack cover 9 can be based on existing connection methods between the battery pack cover 9 and the tray assembly 1 (such as bolt connection), and will not be described in detail here.

[0066] Continue to combine Figures 1 to 3As shown, in some exemplary embodiments, taking the battery pack cover 9 having a maintenance opening 901 and a maintenance cover 902 as an example, this embodiment may, for example, include a BMS (BATTERY MANAGEMENT SYSTEM) in the battery pack, wherein the BMS is located on the side of the maintenance cover 902 facing the electrical compartment.

[0067] Understandably, by placing the BMS on the maintenance cover 902, it is convenient to maintain and assemble the BMS, and the structure is simple and easy to design and implement.

[0068] In practical implementation, the structural form of the BMS described above can be referenced from the structural form of the BMS in existing battery packs, and will not be elaborated further here. The BMS can be mounted on the maintenance cover 902, for example, using bolts.

[0069] It is worth noting that, for the battery pack of this embodiment, based on the above exemplary implementations, in specific implementation, as a preferred embodiment, it may include, for example, a tray assembly 1, a cell module 2, and a battery pack cover 9.

[0070] The tray assembly 1 includes a base plate 101 and a frame 102 disposed on the base plate 101. The battery pack cover 9 is disposed on the tray assembly 1, and the cell module 2 is disposed between the tray assembly 1 and the battery pack cover 9. The base plate 101 has a plurality of splicing units arranged sequentially along the width direction of the base plate 101. Each splicing unit is sequentially welded together, and each splicing unit corresponds to each cell module 2.

[0071] The splicing unit includes two substrates 1011 arranged vertically opposite each other, and several reinforcing ribs 1012 disposed between the two substrates 1011. The reinforcing ribs 1012 are arranged at intervals along the width direction. The splicing unit is provided with several vent holes 104, and each vent hole 104 corresponds to a cell explosion-proof valve on the cell module 2. Both the splicing unit and the frame 102 are made of aluminum profile.

[0072] The battery cell module 2 consists of multiple modules arranged along the width direction of the base plate 101. Each battery cell module 2 includes side plates 202 arranged opposite each other along the width direction of the base plate 101, and several battery cell units 201 disposed between the two side plates 202. Each battery cell unit 201 is stacked sequentially along the length direction of the base plate 101, and two connected battery cell modules 2 share a side plate 202. The side plate 202 is a cold plate, and the battery cell module 2 is glued to the base plate 101.

[0073] The frame 102 has a front beam, on which are provided a high-pressure interface 3, a pressure-resistant interface, a battery pack explosion-proof valve 5, a cold plate liquid inlet / outlet interface 6, an MSD 7, and a fire-fighting interface 8. A battery compartment with a corresponding placement slot 103 is formed between the tray assembly 1 and the battery pack cover 9, and an electrical compartment located in front of the battery compartment along the length of the base plate 101. The battery pack cover 9 has a maintenance opening 901 corresponding to the electrical compartment. A maintenance cover 902 is detachably provided on the maintenance opening 901. A BMS is provided on the maintenance cover 902, and the BMS is located on the side of the maintenance cover 902 facing the electrical compartment.

[0074] In the preferred embodiment of the battery pack above, the specific settings and arrangements of the tray assembly 1, the cell module 2, the base plate 101 and the frame 102, etc., can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the tray assembly 1, the cell module 2, the base plate 101 and the frame 102, etc., can also be referred to the descriptions in the above exemplary embodiments.

[0075] The battery pack in this embodiment adopts the above design. Through the setting of splicing units, modular production can be achieved. The number and length of splicing boards can be increased or decreased according to the number of cell modules 2. That is, the size of the base plate 101 can be increased or decreased by increasing or decreasing the number of splicing units, thereby being compatible with the requirements of different energy densities of the battery pack. At the same time, there is no need to re-open molds, which is beneficial to cost reduction.

[0076] An embodiment of the second aspect of this application provides an energy storage device that includes a battery pack as described above.

[0077] In the energy storage device of this embodiment, the battery pack is used as an energy storage unit and is generally connected to the relevant structures in the energy storage device. The connection form between the battery pack and the relevant structures in the energy storage device, as well as the setting form of the relevant structures in the energy storage device, can all be referred to the connection form and setting form in existing energy storage devices, and will not be described in detail here.

[0078] The energy storage device in this embodiment, through the battery pack setup described above and the splicing unit setup, can achieve modular production. The number and length of the splicing plates can be increased or decreased according to the number of cell modules 2. That is, the size of the base plate 101 can be increased or decreased by increasing or decreasing the number of splicing units, thereby being compatible with the requirements of different energy densities of the battery pack. At the same time, there is no need to re-open the mold, which is beneficial to cost reduction.

[0079] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A battery pack, characterized in that: Includes tray assemblies and battery cell modules; The tray assembly includes a base plate and a frame disposed on the base plate, and the battery cell module is placed in a placement groove formed by the base plate and the frame. The base plate has a plurality of splicing units arranged sequentially along the width direction. Each splicing unit is welded together sequentially, and each splicing unit corresponds to at least one of the battery cell modules.

2. The battery pack according to claim 1, characterized in that: The splicing unit includes two substrates arranged opposite each other, and a plurality of reinforcing ribs disposed between the two substrates, wherein the reinforcing ribs are arranged at intervals along the width direction; and / or, Both the splicing unit and the frame are made of aluminum profiles.

3. The battery pack according to claim 1, characterized in that: The splicing unit is provided with a number of vent holes, and each vent hole is set in correspondence with each cell explosion-proof valve on the cell module.

4. The battery pack according to claim 1, characterized in that: The battery cell module includes side plates arranged opposite each other along the width direction, and a plurality of battery cell units disposed between the two side plates, wherein each battery cell unit is stacked sequentially along the length direction.

5. The battery pack according to claim 4, characterized in that: The battery cell modules are multiple modules arranged along the width direction, and two adjacent battery cell modules share one side plate.

6. The battery pack according to claim 4, characterized in that: The side panel is a cold-rolled steel plate; and / or, The battery cell module is glued to the base plate.

7. The battery pack according to claim 1, characterized in that: The frame has a front beam; The front beam is equipped with at least one of the following: a high-pressure interface, a low-pressure interface, a battery pack explosion-proof valve, a cold plate liquid inlet / outlet interface, an MSD, and a fire-fighting interface.

8. The battery pack according to any one of claims 1 to 7, characterized in that: It also includes a battery pack cover disposed on the tray assembly, a battery compartment corresponding to the placement slot formed between the tray assembly and the battery pack cover, and an electrical compartment located in front of the battery compartment along the length direction; The battery pack cover has a maintenance opening corresponding to the electrical compartment, and a detachable maintenance cover plate located at the maintenance opening.

9. The battery pack according to claim 8, characterized in that: Also includes BMS; The BMS is located on the side of the maintenance cover facing the electrical compartment.

10. An energy storage device, characterized in that: The battery pack includes any one of claims 1 to 9.

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