Battery pack, energy storage device and energy storage system

Abstract

This application relates to the field of battery manufacturing technology and provides a battery pack, energy storage device, and energy storage system. The battery pack of this application includes a cell assembly, an FPC board disposed on the cell assembly, and a connector and a reinforcing plate disposed on the FPC board. The FPC board has a cell acquisition section connected to each cell of the cell assembly, and a wiring harness connection section connected to a wiring harness within the battery pack. The wiring harness connection section is disposed on a fixed plate at one end of the cell assembly along its length. The reinforcing plate is disposed on the side of the wiring harness connection section facing the fixed plate, and the connector is disposed on the side of the wiring harness connection section away from the reinforcing plate. Along the length of the cell assembly, the connector and the wiring harness connection section are at least partially corresponding. The connector has an interface for inserting a plug for the wiring harness, and the insertion direction of the interface forms an angle α with the battery pack base plate. The battery pack of this application facilitates the insertion and removal of wiring harnesses within the battery pack, thereby improving the assembly efficiency of the battery pack.

Description

Technical Field

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

[0002] With the development of new energy technologies, the structural design of battery packs has also continuously evolved. To improve the energy density within the battery pack, the internal structure design is constantly moving towards compactness. A battery pack generally includes a casing, battery cells, and a battery management system (BMS) assembly. Both the battery cells and the BMS are housed within the casing. The battery cells are connected via conductive components and then connected to the BMS via wiring harnesses.

[0003] The battery management system includes an FPC board, which is used to connect conductive components of the battery cell pack to collect information about the battery cell pack. The FPC board is equipped with connectors that can be plugged into the wiring harness in the battery management system. Due to the influence of the battery pack structure design, the space for plugging and unplugging the connectors and plugs is limited, which is not conducive to improving the assembly efficiency of the battery pack. Utility Model Content

[0004] In view of this, the present application aims to provide a battery pack that improves the assembly efficiency of the battery pack.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] A battery pack includes a cell assembly, an FPC board disposed on the cell assembly, and a connector and a reinforcing plate disposed on the FPC board;

[0007] The FPC board has a cell acquisition part connected to each cell of the cell group, and a wire harness connection part connected to the wire harness in the battery pack. The wire harness connection part is disposed on a fixed plate at one end of the cell group along its length. The reinforcing plate is disposed on the side of the wire harness connection part facing the fixed plate. The connector is disposed on the side of the wire harness connection part away from the reinforcing plate and along the length of the cell group. The connector and the wire harness connection part are at least partially corresponding.

[0008] The connector has an interface for inserting a plug into the wiring harness, and the insertion direction of the interface forms an angle α with the base plate of the battery pack.

[0009] Furthermore, the reinforcing plate is an epoxy board.

[0010] Furthermore, the thickness t of the reinforcing plate satisfies: 1.4 < t < 1.8 mm.

[0011] Furthermore, the FPC board is provided with a first through hole, and the reinforcing plate is provided with a second through hole; the FPC board is assembled onto the fixing plate by fasteners passing through the first through hole and the second through hole.

[0012] Furthermore, the wiring harness includes a trunk and branches; the trunk is provided with a plurality of branches, one end of which is provided with a plug, the plug being pluggably connected to the connector.

[0013] Furthermore, when the plug is inserted into the connector, the branch is angled to the main body; the angle α between the insertion direction of the interface and the bottom plate of the battery pack and the angle β between the branch and the main body satisfy: β≤α.

[0014] Furthermore, the width A of the wire harness connection portion projected along the length direction of the battery cell assembly, the width B of the connector, the length C of the connector, and the included angle α between the insertion direction of the interface and the bottom plate of the battery pack satisfy: B×sinα+C×cosα<A.

[0015] Furthermore, the length L of the branch, the distance D between the connection point of the branch and the plug and the main trunk, and the angle β between the branch and the main trunk satisfy: β=sin -1 (D / L).

[0016] Compared with related technologies, this application has the following advantages:

[0017] (1) The battery pack described in this application, by setting the reinforcing plate, facilitates the strengthening of the FPC board structure, and helps to assist the assembly of the FPC board on the fixing plate and improve the assembly effect of the FPC board. At the same time, by forming an angle α between the insertion direction of the interface and the bottom plate of the battery pack, the connector can be tilted, which facilitates the insertion of the wire harness plug and helps to reduce the wiring on the FPC board for connection with the connector pins, thereby helping to improve the assembly efficiency of the battery pack.

[0018] (2) By making the reinforcing board an epoxy board, it is easier to process and manufacture the reinforcing board, and it has good insulation performance and structural strength, avoiding the impact on the FPC board, and making the design and implementation easier.

[0019] (3) By ensuring that the thickness t of the reinforcing plate satisfies: 1.4 < t < 1.8 mm, the thickness of the reinforcing plate is further limited, which helps to ensure the structural strength of the reinforcing plate while reducing the space occupied in the battery pack, making the structure more compact and easier to design and implement.

[0020] (4) The first and second through holes facilitate the assembly of the FPC board and the reinforcing plate onto the fixing plate with fasteners. The structure is simple, easy to process, easy to assemble, and conducive to design implementation.

[0021] (5) By including the main trunk and branches, the wire harness is easy to connect to the corresponding structure in the battery pack. The mating of the plug-to-plug connectors facilitates the connection of the wire harness to the FPC board, making operation easier and design implementation more convenient.

[0022] (6) By ensuring that the angle α between the insertion direction of the interface and the base plate of the battery pack and the angle β between the branch and the main trunk satisfy: β≤α, it is convenient to determine the branch point of the wire harness branch, which is helpful for the structural design of the battery pack and facilitates the design implementation.

[0023] (7) By ensuring that the width A of the wire harness connection part projected along the length direction of the battery pack, the width B of the connector, the length C of the connector, and the angle α between the insertion direction of the interface and the bottom plate of the battery pack satisfy: B×sinα+C×cosα<A, it is convenient to set the insertion direction of the interface according to the size of the connector and the size of the wire harness connection part, ensuring the setting effect of the connector tilt setting, and facilitating the design implementation.

[0024] (8) The length L of the branch, the distance D between the branch and the plug and the main trunk, and the angle β between the branch and the main trunk satisfy: β=sin -1 (D / L) further limits the included angle β, which is beneficial for adapting the included angle α to further adapt the insertion and removal angle, thus facilitating design and implementation.

[0025] This application also proposes an energy storage device, wherein the energy storage device is provided with a battery pack as described above.

[0026] This application also proposes an energy storage system, including the energy storage device described above.

[0027] The energy storage device described in this application includes a battery pack as described above, and the energy storage system includes an energy storage device as described above. Compared with the prior art, it has the same beneficial effects as the battery pack described above, so it will not be described again here. Attached Figure Description

[0028] 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:

[0029] Figure 1 This is a partial structural diagram of the battery pack described in an embodiment of this application;

[0030] Figure 2This is a schematic diagram showing the structural relationship between the FPC board and the wiring harness of the battery pack described in the embodiments of this application;

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Battery cell assembly;

[0033] 2. FPC board; 201. Battery cell acquisition unit; 202. Wiring harness connection unit;

[0034] 3. Connector; 4. Mounting plate; 5. Housing; 6. Data acquisition component;

[0035] 7. Wire harness; 701. Main trunk; 702. Branch;

[0036] 8. Reinforcing plate. Detailed Implementation

[0037] 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.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] An embodiment of the first aspect of this application provides a battery pack that is used in a power device or energy storage device, mainly for storing and releasing electrical energy. The battery pack of this embodiment, with its innovative structural design, facilitates the insertion and removal of wiring harnesses, thereby helping to improve the assembly efficiency of the battery pack.

[0044] In related technologies, with the development of new energy technologies, the structural design of battery packs has also been continuously evolving. To improve the energy density within the battery pack, the internal structural design is constantly moving towards compactness. A battery pack generally includes a casing, battery cell assembly, and a battery management system (BMS) assembly. Both the battery cell assembly and the BMS are housed within the casing. The battery cell assembly is connected via conductive components and then connected to the BMS via wiring harnesses.

[0045] The battery management system includes an FPC board, which is used to connect conductive components of the battery cell pack to collect information about the battery cell pack. The FPC board is equipped with connectors that can be plugged into the wiring harness in the battery management system. Due to the influence of the battery pack structure design, the space for plugging and unplugging the connectors and plugs is limited, which is not conducive to improving the assembly efficiency of the battery pack.

[0046] In view of this, in order to overcome the shortcomings of the related technology, the battery pack of this embodiment combines... Figures 1 to 2 As shown, the overall design includes a battery cell assembly 1, an FPC board 2, and a connector 3 and a reinforcing plate 8 disposed on the FPC board 2.

[0047] The FPC board 2 is disposed on the cell assembly 1. The FPC board 2 has a cell acquisition part 201 connected to each cell of the cell assembly 1, and a wire harness connection part 202 connected to the wire harness 7 in the battery pack. The wire harness connection part 202 is disposed on a fixing plate 4 at one end of the length direction of the cell assembly 1. A reinforcing plate 8 is disposed on the side of the wire harness connection part 202 facing the fixing plate 4. A connector 3 is disposed on the side of the wire harness connection part 202 away from the reinforcing plate 8. Along the length direction of the cell assembly 1, the connector 3 and the wire harness connection part 202 are at least partially corresponding. The connector 3 has an interface for inserting a plug of the wire harness 7. The insertion direction of the interface forms an angle α with the bottom plate of the battery pack.

[0048] Therefore, by setting the reinforcing plate 8, the structural strength of the FPC board 2 is enhanced, and the assembly of the FPC board 2 on the fixing plate 4 is facilitated, and the assembly effect of the FPC board 2 is improved. At the same time, the insertion direction of the interface forms an angle α with the battery pack base plate, which allows the connector 3 to be set at an angle, which facilitates the mating of the plug of the wire harness 7, and helps to reduce the wiring on the FPC board 2 used for connecting to the pins of the connector 3, thereby helping to improve the assembly efficiency of the battery pack.

[0049] Based on the above general introduction, specifically, the battery pack in this embodiment, as an exemplary implementation, generally includes a housing 5.

[0050] The aforementioned housing 5 typically has a base plate and side beams. The base plate serves as the base of the battery pack, and the side beams enclose the base plate, forming an accommodating space within the housing 5. Furthermore, the housing 5 generally also includes crossbeams and longitudinal beams that separate the cell packs 1. These beams divide the accommodating space within the housing 5 into multiple spaces for accommodating the cell packs 1, with each cell pack 1 corresponding to its designated space. The arrangement of the housing 5 and its related structures can be referenced from the existing battery pack housings and their related structures, and will not be elaborated upon further here.

[0051] In practical implementation, the FPC board 2 is typically part of the battery management system of the battery pack, used to collect information from the cell group 1 and feed it back to the battery management system for monitoring the status of the cell group 1. The cell acquisition unit 201 of the FPC board 2 is connected to the cell group 1 via the acquisition component 6. The specific configuration of the acquisition component 6 can be referenced from the acquisition structure configuration of the FPC board 2 and cell group 1 in existing battery packs (such as the configuration of nickel plate connecting to the battery plate, etc.), and will not be elaborated here.

[0052] In practical implementation, the fixing plate 4 mentioned above can be, for example, the end plate of the cell assembly 1 or the crossbeams and longitudinal beams within the battery pack. The specific form can be determined by combining the specific arrangement of the cell assembly 1 within the battery pack. The specific corresponding form of the fixing plate 4 mentioned above can be referenced from the existing arrangement of the FPC board 2 on the cell assembly 1 in the battery pack, and will not be elaborated here.

[0053] The connector 3 typically has a terminal block and a plug-in end. The plugging / plugging direction of the connector 3 corresponds to the direction of the connection between the plug-in end and the terminal block. The terminal block of the connector 3 can be directly soldered onto the FPC board 2, and the pins of the terminal block are connected to the traces on the FPC board 2. The connector 3 is at least partially corresponding to the wire harness connection part 202, that is, the projection area of ​​the connector 3 along the thickness direction of the connector 3 is located within the projection area of ​​the wire harness connection part 202 along the thickness direction of the connector 3.

[0054] In some exemplary embodiments, taking the reinforcement plate 8 inside the battery pack as an example, this embodiment may make the reinforcement plate 8 an epoxy board.

[0055] It is understandable that by making the reinforcing plate 8 an epoxy board, it is easier to process and manufacture the reinforcing plate 8, and it has good insulation performance and structural strength, avoiding the impact on the FPC board 2, and facilitating the design and implementation.

[0056] In specific implementation, the shape of the reinforcing plate 8 can be rectangular, for example. The projection area of ​​the reinforcing plate 8 in the length direction of the cell assembly 1 is located within the projection area of ​​the wire harness connection part 202. Specifically, the reinforcing plate 8 can be, for example, an FR4 epoxy board. Of course, in addition to the above-mentioned reinforcing plate 8 being an FR4 epoxy board, the reinforcing plate 8 can also be made of other materials with similar physical properties and chemical forms, as long as it has insulation properties and sufficient structural strength to support the FPC board 2.

[0057] In some exemplary embodiments, taking the reinforcing plate 8 as an epoxy board as an example, this embodiment may make the thickness t of the reinforcing plate 8 satisfy: 1.4 < t < 1.8 mm.

[0058] It is understandable that by ensuring that the thickness t of the reinforcing plate 8 satisfies 1.4 < t < 1.8 mm, the thickness of the reinforcing plate 8 is further limited, which helps to ensure the structural strength of the reinforcing plate 8 while reducing the space occupied in the battery pack, making the structure more compact and easier to design and implement.

[0059] Combination Figure 1 and Figure 2 As shown, in some exemplary embodiments, this embodiment may, for example, have a first through hole on the FPC board 2 and a second through hole on the reinforcing plate 8, and the FPC board 2 is assembled onto the fixing plate 4 by fasteners passing through the first and second through holes.

[0060] It is understandable that the setting of the first and second through holes facilitates the assembly of the FPC board 2 and the reinforcing plate 8 onto the fixing plate 4 with fasteners. The structure is simple, easy to process, easy to assemble, and conducive to design and implementation.

[0061] In specific implementation, the above fasteners can be, for example, bolts. The fixing plate 4 is provided with bolt holes corresponding to the first through hole and the second through hole. The bolts pass through the first through hole and the second through hole and are screwed into the bolt holes. The FPC plate 2 is assembled on the fixing plate 4. At this time, the reinforcing plate 8 is located between the FPC plate 2 and the fixing plate 4.

[0062] Continue to combine Figure 1 and Figure 2 As shown, in some exemplary embodiments, this embodiment may, for example, make the harness 7 include a trunk 701 and a branch 702.

[0063] The main trunk 701 has multiple branches 702, and one end of one branch 702 has a plug that can be plugged into the connector 3.

[0064] It is understandable that by including a main trunk 701 and a branch 702 in the wiring harness 7, it is convenient to connect the wiring harness 7 to the corresponding structure in the battery pack, and the mating arrangement of the plug-to-plug connector 3 facilitates the connection of the wiring harness 7 to the FPC board 2, making operation easier and design implementation more convenient.

[0065] In practical implementation, the number of branches 702 of the wiring harness 7 can, for example, match at least the number of battery cell groups 1. Each branch 702 of each battery cell group 1 has a plug for connecting to the connector 3, and the plug is inserted into the connector 3. The connection method of the plug and the connector 3 can be referenced from the connection method of the wiring harness 7 plug and the connector 3 in the existing battery pack, and will not be described in detail here. Furthermore, the arrangement of the wiring harness 7 in the battery pack can also be referenced from the arrangement of the wiring harness 7 in the existing battery pack, and will not be described in detail here either.

[0066] Continue to combine Figure 1 and Figure 2 As shown, taking the wire harness 7 including the main trunk 701 and the branch 702 as an example, this embodiment allows the branch 702 to be angled relative to the main trunk 701 when the plug is inserted into the connector 3.

[0067] Among them, the angle α between the insertion direction of the interface and the battery pack base plate and the angle β between the branch 702 and the main trunk 701 satisfy: β≤α.

[0068] It is understandable that by ensuring that the angle α between the insertion direction of the interface and the base plate of the battery pack is equal to the angle β between the branch 702 and the main trunk 701, β≤α, it is easier to determine the branch 702 point of the wire harness 7 branch 702, which is helpful for the structural design of the battery pack and facilitates the design implementation.

[0069] In practice, in order to ensure the insertion and removal of the plug and connector 3, the length of branch 702 is usually slightly longer than the distance from the branch 702 point to the connector 3. This allows the wire harness 7 to be in a state of no tension, so that it can droop slightly under its own weight, thus avoiding the plug from pulling on branch 702 after it is inserted into connector 3.

[0070] Continue to combine Figures 1 to 2 As shown, in some exemplary embodiments, the angle α between the insertion direction of the interface and the battery pack base plate and the angle β between the branch 702 and the main trunk 701 satisfy β≤α. For example, in this embodiment, the width A projected along the length direction of the wire harness connection 202, the width B of the connector 3, the length C of the connector 3, and the angle α between the insertion direction of the interface and the battery pack base plate satisfy: the width A projected along the length direction of the wire harness connection 202, the width B of the connector 3, the length C of the connector 3, and the angle α between the insertion direction of the interface and the battery pack base plate satisfy: B×sinα+C×cosα<A.

[0071] It is understandable that by ensuring that the width A of the wire harness connection part 202 projected along the length direction of the battery cell assembly 1, the width B of the connector 3, the length C of the connector 3, and the included angle α between the insertion direction of the interface and the bottom plate of the battery pack satisfy: B×sinα+C×cosα<A, it is convenient to set the insertion direction of the interface according to the size of the connector 3 and the size of the wire harness connection part 202, ensuring the setting effect of the connector 3 being tilted, and facilitating design implementation.

[0072] In practical implementation, the dimensions represented by width A, width B, length C, and included angle α above can be referenced. Figure 2 The dimensions and positions shown can be measured correspondingly on the specific structure. In this embodiment... Figure 2 The dimensions and positions shown are for structural explanation only and do not represent the actual structural form in the implementation.

[0073] Continue to combine Figures 1 to 2As shown, in some exemplary embodiments, the angle α between the insertion direction of the interface and the battery pack base plate and the angle β between the branch 702 and the main trunk 701 satisfy β≤α. For example, in this embodiment, the length L of the branch 702, the distance D between the connection point of the branch 702 and the plug and the main trunk 701, and the angle β between the branch 702 and the main trunk 701 satisfy β=sinα. -1 (D / L).

[0074] It is understood that the length L of the branch 702, the distance D between the connection point of the branch 702 and the plug and the main trunk 701, and the angle β between the branch 702 and the main trunk 701 satisfy: β=sin -1 (D / L) further limits the included angle β, which is beneficial for adapting the included angle α to further adapt the insertion and removal angle, thus facilitating design and implementation.

[0075] In practical implementation, the dimensions and positions represented by the length L, spacing D, and included angle β above can be referenced. Figure 2 The dimensions and positions shown can be measured accordingly on the specific structure. This embodiment summarizes... Figure 2 The dimensions and positions shown are for structural explanation only and do not represent the actual structural form in the implementation.

[0076] It is worth noting that, regarding the battery pack of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figure 1 and Figure 2 As shown, it generally includes a housing 5.

[0077] The housing 5 contains a cell assembly 1, an FPC board 2, a connector 3, and a reinforcing plate 8. The FPC board 2 has a cell acquisition section 201 connected to each cell of the cell assembly 1, and a wiring harness connection section 202 connected to the wiring harness 7 in the battery pack. The wiring harness connection section 202 is located on a fixing plate 4 at one end of the length direction of the cell assembly 1. The reinforcing plate 8 is located on the side of the wiring harness connection section 202 facing the fixing plate 4. The connector 3 is located on the side of the wiring harness connection section 202 away from the reinforcing plate 8. Along the length direction of the cell assembly 1, the connector 3 and the wiring harness connection section 202 are at least partially corresponding. The connector 3 has an interface for inserting a plug for the wiring harness 7, and the insertion direction of the interface forms an angle α with the bottom plate of the battery pack.

[0078] The reinforcing plate 8 is an FR4 epoxy board, and its thickness t satisfies the condition: 1.4 < t < 1.8 mm. The FPC board 2 has a first through hole, and the reinforcing plate 8 has a second through hole. The FPC board 2 is assembled onto the fixing plate 4 by fasteners passing through the first and second through holes. The fasteners are bolts.

[0079] The wiring harness 7 includes a main trunk 701 and branches 702. The main trunk 701 has multiple branches 702, one end of which has a plug that can be plugged into and detached from the connector 3. The angle α between the insertion direction of the interface and the battery pack base plate, and the angle β between the branch 702 and the main trunk 701, satisfy: β ≤ α.

[0080] The width A of the wire harness connection part 202 projected along the length direction of the cell group 1, the width B of the connector 3, the length C of the connector 3, and the included angle α between the insertion direction of the interface and the bottom plate of the battery pack satisfy the following: the width A of the wire harness connection part 202 projected along the length direction of the cell group 1, the width B of the connector 3, the length C of the connector 3, and the included angle α between the insertion direction of the interface and the bottom plate of the battery pack satisfy: B×sinα+C×cosα<A.

[0081] Among them, the length L of branch 702, the distance D between the connection point of branch 702 and the plug and the main trunk 701, and the angle β between branch 702 and the main trunk 701 satisfy: β=sin -1 (D / L).

[0082] In the preferred embodiment of the above-mentioned muffler assembly, the specific configuration and arrangement of the FPC board 2, the fixing plate 4, the battery cell acquisition part 201, and the wire harness connection part 202 can still be referred to the descriptions in the above-mentioned exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the FPC board 2, the fixing plate 4, the battery cell acquisition part 201, and the wire harness connection part 202 can also be referred to the descriptions in the above-mentioned exemplary embodiments.

[0083] The battery pack in this embodiment adopts the above design. The reinforcement plate 8 is set to enhance the structural strength of the FPC board 2 and help to assemble the FPC board 2 on the fixing plate 4, thereby improving the assembly effect of the FPC board 2. At the same time, the insertion direction of the interface forms an angle α with the bottom plate of the battery pack, which makes the connector 3 tilted, facilitating the insertion of the plug of the wire harness 7 and helping to reduce the wiring on the FPC board 2 for connecting to the pins of the connector 3, thus helping to improve the assembly efficiency of the battery pack.

[0084] An embodiment of the second aspect of this application provides an energy storage device that includes a battery pack as described above.

[0085] In the energy storage device of this embodiment, the battery pack, as an energy storage unit, is typically connected to the energy storage device's management system after being connected to other battery packs. The connection method between the battery pack and the energy storage device's management system, as well as other related structures of the energy storage device, can all be referenced from corresponding forms in existing energy storage devices, and will not be elaborated further here.

[0086] The energy storage device of this embodiment improves the arrangement of the FPC board 2 by setting the battery pack as described above, and facilitates the insertion and connection of the plug and interface of the wiring harness 7, thereby improving the assembly efficiency of the battery pack and the assembly efficiency of the energy storage device.

[0087] An embodiment of the third aspect of this application provides an energy storage system that includes the energy storage device described above.

[0088] In the energy storage system of this embodiment, the above-mentioned energy storage device serves as the core component of the energy storage system and is generally connected to other related structures within the energy storage system. The connection methods between the above-mentioned energy storage device and other related structures in the energy storage system can be referenced from the connection methods between energy storage devices and other related structures in existing energy storage systems, and will not be elaborated further here.

[0089] The energy storage system of this embodiment improves the arrangement effect of FPC board 2 by setting the energy storage device as described above, and facilitates the plug and interface of wire harness 7, thereby helping to improve the assembly efficiency of battery pack, the assembly efficiency of energy storage device, and the assembly efficiency of energy storage system.

[0090] 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: It includes a battery cell assembly, an FPC board disposed on the battery cell assembly, and a connector and a reinforcing plate disposed on the FPC board; The FPC board has a cell acquisition part connected to each cell of the cell group, and a wire harness connection part connected to the wire harness in the battery pack. The wire harness connection part is disposed on a fixed plate at one end of the cell group along its length. The reinforcing plate is disposed on the side of the wire harness connection part facing the fixed plate. The connector is disposed on the side of the wire harness connection part away from the reinforcing plate and along the length of the cell group. The connector and the wire harness connection part are at least partially corresponding. The connector has an interface for inserting a plug into the wiring harness, and the insertion direction of the interface forms an angle α with the base plate of the battery pack.

2. The battery pack according to claim 1, characterized in that: The reinforcing plate is an epoxy board.

3. The battery pack according to claim 2, characterized in that: The thickness t of the reinforcing plate satisfies: 1.4 < t < 1.8 mm.

4. The battery pack according to claim 1, characterized in that: The FPC board is provided with a first through hole, and the reinforcing board is provided with a second through hole; The FPC board is assembled onto the mounting plate by fasteners passing through the first and second through holes.

5. The battery pack according to any one of claims 1-4, characterized in that: The harness includes a trunk and branches; The main trunk has multiple branches, and one of the branches has a plug at its end, which is pluggably connected to the connector.

6. The battery pack according to claim 5, characterized in that: When the plug is inserted into the connector, the branch is angled relative to the main body; The angle α between the insertion direction of the interface and the base plate of the battery pack and the angle β between the branch and the main trunk satisfy: β≤α.

7. The battery pack according to claim 6, characterized in that: The width A of the wire harness connection portion projected along the length direction of the battery cell assembly, the width B of the connector, the length C of the connector, and the included angle α between the insertion direction of the interface and the battery pack base plate satisfy: B×sinα+C×cosα <A。 8. The battery pack according to claim 6, characterized in that: The length L of the branch, the distance D between the branch and the plug and the main trunk, and the angle β between the branch and the main trunk satisfy: β=sin -1 (D / L).

9. An energy storage device, characterized in that: The energy storage device includes a battery pack as described in any one of claims 1 to 8.

10. An energy storage system, characterized in that: Includes the energy storage device described in claim 9.

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