Battery structure

Abstract

The utility model discloses a battery structure and relates to the technical field of batteries. The battery structure comprises a battery cell group, a lamp panel, a protection plate and an FPC (Flexible Printed Circuit), in the first direction, the protection plate, the battery cell set and the lamp panel are sequentially arranged, and the lamp panel is electrically connected with the protection plate through the FPC. In the battery structure, the lamp panel and the protection plate are separated through the battery main body when being assembled, so that the influence of the protection plate on the lamp panel can be reduced, and the display accuracy of the lamp panel is improved. The lamp panel and the protection plate are electrically connected through the FPC, the FPC is generally thin, the connection positions of the FPC, the lamp panel and the protection plate can be distributed at different positions in the shell of the battery, and compared with the space occupied by redundant wiring needed by the FPC due to assembly and the like in a concentrated mode when the lamp panel and the protection plate are arranged in an attached mode, the space at different positions in the shell can be adaptively utilized, and the reliability of the battery is improved. The utilization rate of the original space is improved, the requirement for additionally arranging an independent space is reduced, and the internal space layout of the battery is optimized.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery structure. Background Technology

[0002] In a current type of battery, there are two components: a light board (such as an LED indicator or display screen) and a protection board (PCB). The light board and the protection board are located on the same side of the battery cell assembly and are connected by wires or a common flexible circuit board. However, the protection board usually integrates a BMS system, which generates electromagnetic field effects that affect the accuracy of the information displayed on the light board, for example, affecting the light board's ability to identify the remaining battery power.

[0003] Therefore, how to improve the accuracy of the light panel display is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a battery structure that can reduce the impact of the protection board on the lamp board and improve the accuracy of the lamp board display.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A battery structure includes a cell assembly, a lamp board, a protection board, and an FPC; in a first direction, the protection board, the cell assembly, and the lamp board are arranged sequentially, and the lamp board is electrically connected to the protection board through the FPC.

[0007] Preferably, the FPC is fixedly connected and / or thermally connected to the outer side of the battery cell assembly.

[0008] Preferably, the FPC extends along the first direction, with a main body section in the middle and two connecting sections at both ends that electrically connect the protection plate and the lamp plate; the two connecting sections are bent at the joints with the main body section and bend in opposite directions relative to the main body section.

[0009] Preferably, the lamp board and the protection board are respectively provided with connectors on the side away from the battery pack in the first direction, and the two ends of the FPC are electrically connected to the corresponding connectors by bending.

[0010] Preferably, the battery cell assembly includes battery cells, each battery cell including a battery cell body and a battery cell tab disposed at one end of the battery cell body in the first direction, the protection plate being connected to the other end of the battery cell tab in the first direction, and a first accommodating space being provided between the battery cell body and the protection plate; one end of the FPC is a protection plate connecting section electrically connected to the protection plate, the protection plate connecting section being a first bending structure, at least a portion of the first bending structure extending into the first accommodating space.

[0011] Preferably, one end of the FPC in the first direction is a protection plate connecting section, a protection plate connector is provided on one side of the protection plate, the protection plate connecting section is electrically connected to the protection plate connector, and the edge of the protection plate is provided with a side groove; the protection plate connecting section has a first connecting portion; the first connecting portion includes a first arm, a second arm, and a third arm, the second arm is located between the first arm and the third arm, the first arm and the third arm are bent toward the same side relative to the second arm, the second arm is embedded in the side groove, and the first arm and the third arm are located on both sides of the protection plate in the first direction.

[0012] Preferably, the protection board is further provided with an output connector, and the output connector and the protection board connector are located on two adjacent edges of the protection board.

[0013] Preferably, the protective plate connecting section further includes a U-shaped second connecting part, the first connecting part and the second connecting part are arranged sequentially along the direction close to the lamp plate and form an S-shaped structure; in the direction perpendicular to the first direction, the second connecting part is provided on one side of the battery cell tab of the battery cell group and is spaced apart from each of the battery cell tabs.

[0014] Preferably, one end of the FPC is a lamp board connection section, and the lamp board is provided with a lamp board connector; the lamp board connection section is a second bent structure that protrudes in the middle toward the direction away from the battery cell assembly, and the free end of the lamp board connection section is electrically connected to the lamp board connector.

[0015] Preferably, it further includes a housing, in which the battery cell assembly, the lamp board, and the FPC are all disposed; a second accommodating space is provided in the housing; in a second direction, the second accommodating space is located on one side of the mating point between the lamp board and the battery cell assembly; at least a portion of the second bent structure extends into the second accommodating space.

[0016] The battery structure provided by this utility model includes a cell assembly, a lamp board, a protection board, and an FPC; in a first direction, the protection board, the cell assembly, and the lamp board are arranged in sequence, and the lamp board is electrically connected to the protection board through the FPC.

[0017] In this battery structure, the lamp board and protection board are separated by the battery body during assembly, which reduces the impact of the protection board on the lamp board and improves the accuracy of the lamp board display. The lamp board and protection board are electrically connected through an FPC (Flexible Printed Circuit). The FPC is usually thin, and the connection points between the FPC and the lamp board and protection board can be distributed in different locations within the battery casing. Compared to the case where the lamp board and protection board are bonded together, which requires redundant wiring due to assembly and other reasons and thus occupies concentrated space, this structure can adaptably utilize space in different locations within the casing, improving the utilization rate of the original space, reducing the need for additional independent space, optimizing the internal space layout of the battery, and increasing energy density. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 An exploded view of a specific embodiment of the battery structure provided by this utility model;

[0020] Figure 2 This is an internal axonometric view of a specific embodiment of the battery structure provided by this utility model;

[0021] Figure 3 An axonometric view of the FPC before bending and forming, which is a specific embodiment of the battery structure provided by this utility model;

[0022] Figure 4 A first side view of the FPC before bending and forming, which is a specific embodiment of the battery structure provided by this utility model;

[0023] Figure 5 A front view of the FPC before bending and forming, which is a specific embodiment of the battery structure provided by this utility model;

[0024] Figure 6 The second side view of the FPC before bending and forming, which is a specific embodiment of the battery structure provided by this utility model;

[0025] Figure 7 A top view of the protection plate in a specific embodiment of the battery structure provided by this utility model;

[0026] Figure 8 An isometric view of the assembly structure of the protection plate and FPC in a specific embodiment of the battery structure provided by this utility model;

[0027] Figure 9A top view of the assembly structure of the protection plate and FPC in a specific embodiment of the battery structure provided by this utility model;

[0028] Figure 10 A side view of the assembly structure of the protection plate and FPC in a specific embodiment of the battery structure provided by this utility model;

[0029] Figure 11 A side view of the internal structure of a specific embodiment of the battery structure provided by this utility model;

[0030] Figure 12 for Figure 11 Enlarged view of point B;

[0031] Figure 13 A front view of the internal structure of a specific embodiment of the battery structure provided by this utility model;

[0032] Figure 14 for Figure 13 Enlarged view of point A;

[0033] Figure 15 for Figure 13 Enlarged view of point C;

[0034] Figure 16 A top view of the lamp panel in a specific embodiment of the battery structure provided by this utility model;

[0035] Figure 17 An isometric view of the assembly structure of the lamp board and FPC in a specific embodiment of the battery structure provided by this utility model;

[0036] Figure 18 The bottom view of the assembly structure of the lamp board and FPC in a specific embodiment of the battery structure provided by this utility model;

[0037] Figure 19 A front view of the assembly structure of the protection plate and FPC in a specific embodiment of the battery structure provided by this utility model;

[0038] Figure 20 The internal structure of the battery structure provided in this utility model and the side view after the battery cover is assembled;

[0039] Figure 21 for Figure 20 DD cross-section;

[0040] Figure 22 for Figure 21 Enlarged view of point E.

[0041] Figure label:

[0042] Main shell 1, first shell 1-1, second shell 1-2;

[0043] Battery cover 2;

[0044] Protection board 3, protection board base plate 3-1, protection board connector 3-2, output connector 3-3, side groove 3-4;

[0045] FPC4, main body section 4-1, protective plate connecting section 4-2, first connecting part 4-21, first arm 4-211, second arm 4-212, third arm 4-213, second connecting part 4-22, light panel connecting section 4-3, first connecting arm 4-31, second connecting arm 4-32, third connecting arm 4-33, fourth connecting arm 4-34, reinforcing sheet 4-4, gold finger 4-5, FPC base plate 4-6, FPC adhesive backing 4-7;

[0046] Lamp board 5, lamp board base plate 5-1, lamp board connector 5-2, lamp board button 5-3;

[0047] Battery cell 6, battery cell tab 6-1, inter-tab foam 6-2, inter-cell foam 6-3, end foam 6-4, battery cell body 6-5;

[0048] Cell pack 7;

[0049] First direction X, second direction Y, third direction Z. Detailed Implementation

[0050] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0051] The core of this invention is to provide a battery structure that can improve the accuracy of the light panel display.

[0052] For a specific embodiment of the battery structure provided by this utility model, please refer to 1 to 2018. Figure 22 It includes a battery cell assembly 7, a protection board 3, a lamp board 5, and an FPC4 (Flexible Printed Circuit). In the first direction X, the protection board 3, the battery cell assembly 7, and the lamp board 5 are arranged in sequence, and the lamp board 5 is electrically connected to the protection board 3 through the FPC4.

[0053] It should be noted that the first direction X, the second direction Y, and the third direction Z are three different directions. This application embodiment uses the example of two of them being perpendicular to each other for illustration, and should not be construed as limiting this application. In addition, for the convenience of describing the positional relationship between components, in this application embodiment, the first direction X is described as the vertical direction, with the first end of the first direction X being the top end and the second end being the bottom end, and this should not be construed as limiting this application.

[0054] The cell assembly 7 is used to store electrical energy and includes one or more cells 6, specifically lithium-ion cells, such as prismatic lithium-ion cells. For example, as... Figure 1 and Figure 2 As shown, in the battery cell assembly 7, multiple battery cells 6 are arranged sequentially along the second direction Y. Inter-cell foam 6-3 is provided between adjacent battery cells 6. The battery cells 6 are bonded to the inter-cell foam 6-3 with double-sided adhesive so that the battery cells 6 are stacked to form the battery cell assembly 7. In the first direction X, the battery cells 6 in the battery cell assembly 7 include a battery cell body 6-5 and a battery cell tab 6-1. The battery cell tab 6-1 is located at the first end of the battery cell body 6-5, and inter-tab foam 6-2 is inserted between adjacent battery cell tabs 6-1. At the second end in the first direction X, end foam 6-4 is attached to the battery cell assembly 7.

[0055] The protection board 3 is located at the top of the cell assembly 7. Specifically, the protection board 3 is welded to the cell tabs 6-1 to form a battery pack with charging and discharging functions. The protection board 3 includes a protection board base plate 3-1 and related functional components located on the protection board base plate 3-1. The protection board 3 can be used to realize functions such as battery status monitoring, battery protection, and battery equalization management. Specifically, it can be a PCB, on which a BMS system (Battery Management System) is integrated.

[0056] For example, such as Figure 2 As shown, during the assembly process, after the battery cells 6 are stacked into battery cell group 7, the battery cell tabs 6-1 are pre-bent and shaped. For example, they are shaped into a 7-like shape using a jig. Then, the protection plate 3 is placed on the battery cell tabs 6-1. Specifically, the nickel sheet of the protection plate 3 can be attached to the battery cell tabs 6-1, and then laser welding is performed to connect the battery cell group 7 and the protection plate 3 together.

[0057] The lamp board 5 is located at the bottom of the battery cell assembly 7, such as... Figure 2 As shown, the system includes a base plate 5-1 and a panel button 5-3 mounted on the base plate 5-1. The panel button 5-3 has control and / or display functions, such as switch control, color switching, and power display. In the first direction X, the panel button 5-3 and the battery pack 7 are located on opposite sides of the base plate 5-1.

[0058] The battery cell assembly 7, lamp board 5, protection board 3, and FPC 4 are housed within a housing, which includes a main housing 1 and a battery cover 2 located at the bottom of the main housing 1. For example, as shown... Figure 1 As shown, in the second direction Y, the main housing 1 includes a first housing 1-1 and a second housing 1-2 that are interlocked for easy assembly and disassembly. During assembly, the lamp board 5 can be locked together with the battery cover 2 first, and then the protection board 3 and the lamp board 5 can be connected through the FPC 4 to assemble the main housing 1 and the battery cover 2, thus completing the outer casing encapsulation and forming a complete battery pack.

[0059] In this embodiment, the battery structure separates the lamp board 5 and the protection board 3 during assembly via the cell assembly 7. This reduces the impact of the protection board 3 on the lamp board 5 and improves the accuracy of the lamp board 5's display. The lamp board 5 and the protection board 3 are electrically connected via an FPC4. The FPC4 is typically thin, and its connection points with the lamp board 5 and the protection board 3 can be distributed in different locations within the battery casing. Compared to the space occupied by redundant wiring required for assembly when the lamp board 5 and the protection board 3 are bonded together, this design allows for adaptive use of space in different locations within the casing, improving the utilization rate of existing space, reducing the need for additional independent space, optimizing the internal space layout of the battery, and increasing energy density.

[0060] Furthermore, such as Figures 3 to 6 As shown, FPC4 is a long, strip-shaped sheet structure, and the substrate of FPC4 can specifically be polyimide. Exemplarily, in the first direction X, FPC4 sequentially includes a main body segment 4-1 and two connecting segments located at both ends of the main body segment 4-1. The two connecting segments are a lamp board connecting segment 4-3 and a protection board connecting segment 4-2. The main body segment 4-1, lamp board connecting segment 4-3, and protection board connecting segment 4-2 can be deformed to achieve corresponding connection or assembly requirements. The protection board connecting segment 4-2 is electrically connected to the protection board 3, and the lamp board connecting segment 4-3 is electrically connected to the lamp board 5. Furthermore, to avoid short circuits, leakage, and other faults between circuits, the areas on the outside of FPC4 where no electrical connection is made are insulated.

[0061] In some embodiments, such as Figure 2 As shown, the main body segment 4-1 and the cell assembly 7 are arranged sequentially along the second direction Y. In this case, after the cells 6 are stacked along the second direction Y to form the cell assembly 7, the FPC4 can be directly connected to one side of the cell assembly 7 along the second direction Y. The main body segment 4-1 is a rectangular sheet structure. In other embodiments, depending on the available space, the FPC4 can also be positioned in other locations or shapes. For example, the FPC4 can be partially located between adjacent cells 6, or partially located on one side of the cell assembly 7 along the second direction Y and partially located on the third direction Z side of the cell assembly 7; the FPC4 can be an S-shaped or L-shaped bent structure.

[0062] In some embodiments, the FPC4 is fixedly connected to the outer surface of the cell assembly 7. For example... Figure 2 As shown, the main body segment 4-1 is located on one side of the battery cell assembly 7 in the second direction Y and is fixedly connected to the outer surface of the battery cell assembly 7. This ensures that the FPC4 remains stationary within the casing during bending or vibration, preventing poor contact, signal attenuation, or open circuits. It also prevents circuit damage caused by external friction or compression of the FPC4, improving the reliability, stability, and anti-interference capability of FPC4 signal transmission, reducing the signal transmission error rate, and enhancing the reliability and mechanical stability of signal transmission. In other embodiments, the main body segment 4-1 and the battery cell assembly 7 can also be configured to be relatively movable.

[0063] Specifically, FPC4 is bonded and fixed to the outer surface of the cell assembly 7. For example... Figure 2 and Figure 3 As shown, FPC4 includes an FPC base plate 4-6 and an FPC adhesive 4-7 disposed on one side of the FPC base plate 4-6 in the second direction Y. The main body segment 4-1 is bonded to the battery cell assembly 7 by the FPC adhesive 4-7, facilitating assembly. Optionally, the FPC adhesive 4-7 is a high-temperature resistant double-sided adhesive, such as the 3M series, for example, 3M9448. Furthermore, FPC4 is fully bonded to the battery cell assembly 7 by the FPC adhesive 4-7, specifically, the entire side of the main body segment 4-1 near the battery cell assembly 7 in the second direction Y is bonded to the battery cell assembly 7. Additionally, the adhesive layer thickness of the FPC adhesive 4-7 is preferably ≤0.1mm to avoid excessive adhesive layer affecting heat dissipation. In other embodiments, the main body segment 4-1 and the outer side of the battery cell assembly 7 can also be fixedly connected by welding, snap-fitting, or other methods.

[0064] In some embodiments, the FPC4 is thermally connected to the outer surface of the cell assembly 7. This thermal connection means that the cell assembly 7 can conduct heat to the FPC4 through the connection point, allowing the FPC4 to further dissipate heat outwards. This fully utilizes the metal or other materials in the FPC4 with good heat dissipation capabilities, thereby improving the heat dissipation capacity of the cell assembly 7. Furthermore, when the cell assembly 7 is simultaneously thermally connected and fixedly connected to the FPC, the connector used for the fixed connection is preferably a connector with good thermal conductivity; alternatively, different areas of the cell assembly 7 may be thermally connected and fixedly connected to the FPC4 separately.

[0065] Specifically, to achieve thermally conductive connection, the battery cell 6 can be pre-treated by cleaning its surface and applying thermally conductive silicone grease. The battery cell 6 then adheres to the main body segment 4-1 via the silicone grease, allowing heat transfer to the main body segment 4-1. At this time, the heat from the battery cell assembly 7 is evenly conducted to the main body segment 4-1 through the casing of the battery cell 6, reducing the local temperature rise of the battery cell 6 by more than 10°C. Furthermore, the side of the main body segment 4-1 closest to the battery cell assembly 7 can be fully fitted to the outer surface of the battery cell assembly 7 to increase the heat transfer area.

[0066] In some embodiments, the FPC4 has a segmented shielding layer inside, with both ends of the shielding layer grounded to the protection plate 3. Optionally, the shielding layer is a copper foil shielding layer, and the shielding layer can be segmented in the first direction X. In the FPC4, segmented shielding layers are provided on both sides of the signal line, and the shielding layers are connected to the FPC grounding terminal through through holes. Based on the segmented shielding layer, crosstalk of long-distance signal lines can be reduced, and the risk of cracking due to bending can be avoided when the shielding layer is set as a whole.

[0067] In some embodiments, to achieve the connection between FPC4 and the lamp board 5 and the protection board 3, FPC4 extends along the first direction X, and its two ends are respectively bent by one or more bends to approach and correspond to the protection board 3 and the lamp board 5 for electrical connection. For example... Figure 1 As shown, the protection board connection section 4-2 of the connection protection board 3 at one end of FPC4 is a first bending structure, and the lamp board connection section 4-3 of the connection lamp board 5 at the other end is a second bending structure. While adapting to the position requirements of electrical connection, the bending can provide redundancy and provide the buffer required for assembly.

[0068] Specifically, such as Figure 19 As shown, the joints of the lamp board connecting section 4-3 and the protection board connecting section 4-2 with the main body section 4-1 are bent, and bent in opposite directions relative to the main body section 4-1. Compared to bending both joints to the same side, this reduces electromagnetic effects within the battery pack and minimizes interference with the overall communication and signal transmission of the battery pack. Furthermore, the bending at each joint of the lamp board connecting section 4-3 and the protection board connecting section 4-2 with the main body section 4-1 creates a crease, which can be considered the boundary between the two connecting sections and the main body section 4-1.

[0069] by Figure 19 Taking FPC4 as an example, the left and right directions in the diagram correspond to the second direction Y. The lamp panel connecting section 4-3 and the protective plate connecting section 4-2 are bent in multiple ways. For the first bend closest to the main body section 4-1, the protective plate connecting section 4-2 and the lamp panel connecting section 4-3 bend towards both sides in the second direction Y. For example, the protective plate connecting section 4-2 bends to the right, forming crease a with the main body section 4-1, and the lamp panel connecting section 4-3 bends to the left, forming crease b with the main body section 4-1. The part of the protective plate connecting section 4-2 closest to the main body section 4-1, and the parts of the main body section 4-1 and the lamp panel connecting section 4-3 closest to the main body section 4-1 generally form a Z-shaped structure, and the bend angle can be 90° or other angles.

[0070] Specifically, such as Figure 1As shown, each crease position of the first bending structure and the second bending structure adopts a rounded corner structure. Through the arc transition of the rounded corner, it is possible to avoid the fracture of the copper foil in the FPC4 caused by right-angle bending, and solve the problem of mechanical stress concentration caused by the bending of the FPC4. In addition, at each end of the FPC4, the crease positions can be arranged in sequence along the direction away from the main body section 4-1.

[0071] Specifically, as Figure 2 shown, on the side of the lamp board 5 and the protection board 3 away from the battery cell group 7 in the first direction X, there are respectively connectors electrically connecting the FPC4, specifically, the protection board connector 3-2 on the protection board 3 and the lamp board connector 5-2 on the lamp board 5. The protection board connector 3-2 and the lamp board connector 5-2 are micro-connectors and can be correspondingly surface-mounted on the lamp board 5 or the protection board 3. At this time, both ends of the FPC4 are bent to be electrically connected to the protection board connector 3-2 and the lamp board connector 5-2. During assembly, both ends of the FPC4 can be correspondingly wound around to the side of the lamp board 5 and the protection board 3 away from the battery cell group 7 along the direction away from the main body section 4-1 for assembly. The assembly space is sufficient, reducing the interference of the battery cell group 7, and the assembly difficulty can be reduced.

[0072] Specifically, to improve the assembly efficiency, the protection board connector 3-2 and / or the lamp board connector 5-2 has an anti-misassembly structure. For example, structures such as asymmetric buckles, positioning posts, and guide grooves can be used to constrain the connection positions of the protection board connection section 4-2 and the lamp board connection section 4-3. When both ends of the FPC4 are inserted into the corresponding protection board connector 3-2 and lamp board connector 5-2, they can be automatically aligned, reducing the manual calibration time, ensuring the stability of the assembly of the FPC4 and the connector, improving the assembly efficiency and production yield, simplifying the assembly process, and reducing the production cost.

[0073] For example, positioning protrusions that cooperate with the positioning grooves on the corresponding connectors can be provided at the ends of the FPC4. Specifically, they can be provided on the two edges of the FPC4 in the third direction Z, such as Figure 6 in which the two ends of the FPC are generally in a middle-character shape structure, so as to visually confirm that the assembly of the FPC4 and the connector is in place through the cooperation of the positioning protrusions and the positioning grooves.

[0074] Specifically, on the protection board connection section 4-2 and the lamp board connection section 4-3, to achieve electrical connection, as Figure 4 and Figure 5 shown, the protection board connection section 4-2 and the lamp board connection section 4-3 are respectively provided with gold fingers 4-5. Specifically, the gold fingers 4-5 can be inserted into the corresponding protection board connector 3-2 or lamp board connector 5-2 for electrical connection.

[0075] In addition, the protection board connection section 4-2 and the lamp board connection section 4-3 are also equipped with reinforcing plates 4-4. Reinforcing plates 4-4 enhance the mechanical properties of the protection board connection section 4-2 and the lamp board connection section 4-3, improve the reliability of the electrical connection, facilitate the insertion and removal of the gold fingers 4-5, and reduce frictional damage during the insertion and removal of the FPC4. For example... Figure 3 As shown, on the two connecting sections 4-2 (protection board connecting section) and 4-3 (lamp board connecting section), a gold finger 4-5 is provided on one side in the second direction Y to enable electrical connection with the corresponding connector, and a reinforcing piece 4-4 is provided on the other side in the second direction Y for reinforcement. Optionally, the reinforcing piece 4-4 is a PI (polyimide) reinforcing piece, which has excellent mechanical strength and insulation properties, ensuring the reliability of FPC4 in complex environments, and has a low density, resulting in weight reduction.

[0076] Specifically, after the outer casing is encapsulated, the protective plate connecting section 4-2 and the lamp board connecting section 4-3 at both ends of the FPC4 are two bent structures with a gap between them and the inner wall of the outer casing to avoid pressure. For example, the gap is ≥1mm. In addition, in the main body section 4-1, since the shape is usually more regular, for example, the main body section 4-1 is a straight sheet structure parallel to the first direction X, which makes it easy to set a shape that matches it on the inner wall of the outer casing. It can be attached to the inner wall of the outer casing or not.

[0077] Furthermore, on the protection plate 3, such as Figures 7 to 14 As shown, a protection board connector 3-2, specifically a BTB connector, is disposed on the end face of the protection board 3 away from the battery cell assembly 7 in the first direction X, to electrically connect to the FPC4. Specifically, it can electrically connect to the protection board connection segment 4-2 of the protection board 3. Of course, in other embodiments, the protection board connector 3-2 can also be disposed on the end face of the protection board 3 near the battery cell assembly 7 in the first direction X.

[0078] In some embodiments, to avoid damage to the connection location, such as Figure 7 and Figure 9 As shown, the edge of the protective plate 3 is provided with a side groove 3-4, and the connecting section 4-2 of the protective plate has a U-shaped first connecting part 4-21. The first connecting part 4-21 is fastened to the protective plate 3, that is, the groove surface of the first connecting part 4-21 is fastened to the protective plate 3, and the middle part of the first connecting part 4-21 is embedded in the side groove 3-4. At this time, the first connecting part 4-21 can be prevented from being damaged by the outer shell due to the avoidance of the side groove 3-4.

[0079] To elaborate, with Figure 14For example, the first connecting part 4-21 includes a first arm 4-211, a second arm 4-212, and a third arm 4-213. The second arm 4-212 is located between the first arm 4-211 and the third arm 4-213, and the first arm 4-211 and the third arm 4-213 are bent towards the same side relative to the second arm 4-212. The second arm 4-212 is embedded in the side groove 3-4, and the first arm 4-211 and the third arm 4-213 are located on both sides of the protective plate 3 in the first direction X. The third arm 4-213 is directly electrically connected to the protective plate connector 3-2. In addition, as needed, the first arm 4-211, the second arm 4-212, and the third arm 4-213 can be flat sheets or curved sheets.

[0080] Specifically, such as Figure 7 As shown, the side groove 3-4 is formed at one edge of the protective plate 3 in the second direction Y, and is located in the middle of the edge in the third direction Z, forming a U-shaped groove. This prevents the outer shell from pressing against the first connecting part 4-21 in the second direction Y. In addition, the side groove 3-4 can be milled.

[0081] Furthermore, the depth of the side groove 3-4 should not be less than the thickness of the FPC4 so as to fully accommodate the FPC4 in the second direction Y. For example, the depth of the side groove 3-4 (specifically the dimension in the second direction Y) is less than the thickness of the protective plate 3 (specifically the dimension in the first direction X), for example, 1 / 3 to 1 / 2 of the thickness of the protective plate 3, to adapt to the thickness of the FPC4 and ensure that the first connecting part 4-21 is fully embedded in the second direction Y and will not protrude from the protective plate 3 in the second direction Y, thus avoiding the FPC4 being pressed by the inner wall of the outer shell when it is bent, and improving the integration of the protective plate 3 and the FPC4.

[0082] Specifically, the protection board connector 3-2 is disposed on the end face of the protection board 3 away from the battery cell assembly 7 in the first direction X, near the side groove 3-4. For example... Figure 7 As shown, along the second direction Y, the side groove 3-4 and the protective plate connector 3-2 are arranged in sequence.

[0083] In some embodiments, such as Figure 9 As shown, the board surface is left empty within a set range around the protection board connector 3-2. "Empty" means that no components are placed within this range. The set range can be set as needed, for example, within a range of 3mm, which can protect the stability of the signal of the protection board connector 3-2.

[0084] In some embodiments, an output connector 3-3 is provided on the protection board 3. The output connector 3-3 and the protection board connector 3-2 are located on two adjacent sides of the protection board 3, so that the FPC4 can be as close as possible to the negative terminal of the output connector 3-3 on the protection board 3, ensuring a shorter current transmission path and thus making signal transmission more efficient.

[0085] It should be noted that the positional relationship between output connector 3-3 and protection board connector 3-2 is not limited to this. When selecting the installation location, to ensure that protection board connector 3-2 is as close as possible to the negative terminal of output connector 3-3, after other structures on protection board 3 are assembled, the location closest to the negative terminal of output connector 3-3 can be selected from the remaining space. In other words, depending on the actual space constraints, output connector 3-3 and protection board connector 3-2 may also be located on opposite sides or on the same side of protection board 3.

[0086] In some embodiments, such as Figure 8 As shown, the protective plate connecting section 4-2 also includes a U-shaped second connecting portion 4-22. The first connecting portion 4-21 and the second connecting portion 4-22 are arranged sequentially along the direction closest to the lamp panel 5 in the first direction X, and the first connecting portion 4-21 and the second connecting portion 4-22 form an S-shaped structure. That is, the concave and convex directions of the first connecting portion 4-21 and the second connecting portion 4-22 are opposite, and at this time, as... Figure 14 As shown, the second connecting portion 4-22, the first connecting portion 4-21, and the portion of the main body segment 4-1 connecting to the second connecting portion 4-22 form a zigzag bending structure. In this case, the second connecting portion 4-22 can provide redundant length, ensuring that the FPC4 has sufficient buffering at the protective plate connecting segment 4-2. In other embodiments, the second connecting portion 4-22 can also be a triangular, S-shaped, or other shaped structure.

[0087] Specifically, a first accommodating space is provided between the battery cell body 6-5 and the protection plate 3, mainly located in the space between the battery cell body 6-5 and the protection plate 3 that is not occupied by the battery cell tab 6-1. At least a portion of the first bending structure extends into the first accommodating space; for example, the second connecting portion 4-22 extends into the first accommodating space to avoid compression damage between it and the outer casing, thereby improving the utilization rate of the space between the battery cell body 6-5 and the protection plate 3.

[0088] Specifically, in the direction perpendicular to the first direction X, such as Figure 13As shown, in the second direction Y, the second connecting part 4-22 is located on one side of the cell tab 6-1 of the cell assembly 7. At this time, the second connecting part 4-22 is positioned below the protective plate 3 near the cell tab 6-1, that is, on the top sealing edge of the cell 6. This prevents interference with the top sealing edge. Furthermore, the second connecting part 4-22 protrudes towards the cell tab 6-1, utilizing the remaining space between the protective plate 3 and the cell 6, excluding the space occupied by the cell tab 6-1. This reduces the space occupied in the casing and improves space utilization. Simultaneously, the second connecting part 4-22 is spaced from each cell tab 6-1 to prevent the cell tab 6-1 from being affected by heat generation, ensuring that the FPC4 and each cell tab 6-1 do not come into contact with each other, thus guaranteeing their reliability and preventing mutual compression damage. Figure 14 As shown, in the second direction Y, the second connecting part 4-22 is spaced apart from each cell electrode tab 6-1, and the minimum distance is at least 4mm; Figure 12 As shown, on the third direction Z, the second connecting part 4-22 is spaced apart from each cell tab 6-1, and the minimum distance is at least 2mm.

[0089] Furthermore, on lamp panel 5, such as Figures 15 to 22 As shown, a lamp board connector 5-2, specifically a BTB connector, is provided on the end face of the FPC4 away from the battery cell assembly 7 in the first direction X. The lamp board connection section 4-3 at one end of the FPC4 in the first direction X is electrically connected to the lamp board connector 5. Of course, in other embodiments, the lamp board connector 5-2 can also be provided on the end face of the lamp board 5 in the first direction X near the battery cell assembly 7.

[0090] Specifically, such as Figure 15 As shown, the lamp board connecting section 4-3 is a second bent structure that protrudes in the middle towards the direction away from the battery cell assembly 7. The free end of the lamp board connecting section 4-3 is electrically connected to the lamp board connector 5-2. The protrusion in the middle of the lamp board connecting section 4-3 is mainly relative to the main body section 4-1, protruding towards the side away from the battery cell assembly 7 in the second direction Y. The free end of the lamp board connecting section 4-3, that is, the end away from the main body section 4-1, is electrically connected to the lamp board connector 5. At this time, the lamp board connecting section 4-3 does not occupy the space between the lamp board 5 and the battery cell assembly 7, and can make full use of the original remaining space in the housing. At the same time, it can ensure that the lamp board connecting section 4-3 has sufficient redundant length, thereby ensuring that the FPC4 has sufficient safe buffer.

[0091] Specifically, to accommodate the second bending structure, such as Figure 22As shown, a second accommodating space is provided in the casing. More specifically, the second accommodating space is located in the battery cover 2, and at least a portion of the second bent structure extends into the second accommodating space, which can improve the utilization rate of the space in the casing. Specifically, in the second direction Y, the second accommodating space is located on one side of the mating point between the lamp panel 5 and the cell assembly 7. This mating point mainly refers to the portion of the cell assembly 7 near the lamp panel 5, the space between the cell assembly 7 and the lamp panel 5, and the portion of the lamp panel 5 near the cell assembly 7.

[0092] Specifically, after the housing is assembled, the lamp panel connecting section 4-3 is spaced apart from the housing, for example... Figure 15 As shown, the distance between the lamp board connecting section 4-3 and the rib in the battery cover 2 is at least 3mm to ensure that the lamp board connecting section 4-3 is not squeezed by the outer shell.

[0093] Specifically, such as Figure 15 As shown, the lamp board connecting segment 4-3 is formed by multiple bends. In the first direction X, away from the main body segment 4-1, the lamp board connecting segment 4-3 sequentially includes a first connecting arm 4-31, a second connecting arm 4-32, a third connecting arm 4-33, and a fourth connecting arm 4-34. The first connecting arm 4-31 is bent away from the main body segment 4-1 in a direction away from the battery cell assembly 7. The second connecting arm 4-32, the third connecting arm 4-33, and the fourth connecting arm 4-34 are bent towards the battery cell assembly 7 in sequence. The second connecting arm 4-32 is parallel to the first direction X, and the third connecting arm 4-33 is inclined relative to the first direction X, thus the lamp board connecting segment 4-3 is generally trapezoidal in shape. The fourth connecting arm 4-34 is directly electrically connected to the lamp board connector 5-2 on the lamp board 5. Of course, in other embodiments, the lamp board connecting segment 4-3 can also be configured as a triangular, S-shaped, or U-shaped bending structure as needed.

[0094] Specifically, no other structures are placed on the lamp board 5 within the safe distance from the lamp board connector 5-2 to ensure the stability of the circuit design and thus make the signal transmission more stable. For example, the lamp board 5 is provided with a lamp board button 5-3 and a connecting through hole for connecting the battery cover 2 or the main housing 1. The lamp board connector 5-2 is spaced apart from the lamp board button 5-3 and the connecting through hole.

[0095] The battery structure assembly process in this embodiment includes: connecting the battery cells 6 together with double-sided adhesive and inter-cell foam 6-3 to form a battery cell group 7; then welding the protection board 3 to the battery cell tabs 6-1 of the battery cell group 7 to form a battery pack with charging and discharging functions; then attaching the end foam 6-4 and inserting the inter-tab foam 6-2; then locking the lamp board 5 to the battery cover 2; then connecting the FPC 4 to the protection board 3 and the lamp board 5 respectively; attaching the large surface of the FPC 4 to the large surface of the battery cell 6, specifically, one end of the FPC 4 can be connected to the lamp board 5 through the lamp board connector; bending the FPC 4 along the large surface of the battery cell 6 and attaching it to the battery cell 6; inserting the other end of the FPC 4 into the side groove of the protection board 3 and completing the docking through the protection board connector; then assembling the first shell 1-1, the second shell 1-2, and the battery cover 2 to form a complete battery pack. After the outer shell is sealed, gaps are left between the bent sections at both ends of the FPC 4 and the inner wall of the outer shell to avoid pressure.

[0096] It should be noted that when an element is referred to as "fixing" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as "connecting" another element, it can be directly connected to the other element or there may be an intervening element. Furthermore, in the description of this utility model, unless otherwise stated, "multiple," "multiple roots," and "multiple groups" mean two or more.

[0097] The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0098] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0099] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0100] The battery structure provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A battery structure, characterized in that, It includes a battery cell assembly (7), a lamp board (5), a protection board (3), and an FPC (4); in the first direction (X), the protection board (3), the battery cell assembly (7), and the lamp board (5) are arranged in sequence, and the lamp board (5) is electrically connected to the protection board (3) through the FPC (4).

2. The battery structure according to claim 1, characterized in that, The FPC (4) is fixedly connected and / or thermally connected to the outer side of the battery cell assembly (7).

3. The battery structure according to claim 1, characterized in that, The FPC (4) extends along the first direction (X), with the main body section (4-1) in the middle and two connecting sections at both ends that are electrically connected to the protection plate (3) and the lamp plate (5); the two connecting sections are bent at the joints with the main body section (4-1) and bend in the opposite direction to the main body section (4-1).

4. The battery structure according to claim 1, characterized in that, The lamp board (5) and the protection board (3) are respectively provided with connectors on the side away from the battery pack (7) in the first direction (X), and the two ends of the FPC (4) are electrically connected to the corresponding connectors by bending.

5. The battery structure according to any one of claims 1 to 4, characterized in that, The battery cell assembly (7) includes a battery cell (6), each battery cell (6) includes a battery cell body (6-5) and a battery cell tab (6-1) disposed at one end of the battery cell body (6-5) in the first direction (X), the protection plate (3) is connected to the other end of the battery cell tab (6-1) in the first direction (X), and a first accommodating space is left between the battery cell body (6-5) and the protection plate (3); One end of the FPC (4) is a protection board connection segment (4-2) electrically connected to the protection board (3). The protection board connection segment (4-2) is a first bending structure, and at least a portion of the first bending structure extends into the first accommodating space.

6. The battery structure according to any one of claims 1 to 4, characterized in that, The FPC (4) has a protection board connection section (4-2) at one end in the first direction (X), and a protection board connector (3-2) is provided on one side of the protection board (3). The protection board connection section (4-2) is electrically connected to the protection board connector (3-2), and the edge of the protection board (3) is provided with a side groove (3-4). The protective plate connecting section (4-2) has a first connecting part (4-21); the first connecting part (4-21) includes a first arm body (4-211), a second arm body (4-212) and a third arm body (4-213), the second arm body (4-212) is located between the first arm body (4-211) and the third arm body (4-213), the first arm body (4-211) and the third arm body (4-213) are bent toward the same side relative to the second arm body (4-212), the second arm body (4-212) is embedded in the side groove (3-4), and the first arm body (4-211) and the third arm body (4-213) are located on both sides of the protective plate (3) in the first direction (X).

7. The battery structure according to claim 6, characterized in that, The protection plate (3) is also provided with an output connector (3-3), and the output connector (3-3) and the protection plate connector (3-2) are located on two adjacent sides of the protection plate (3).

8. The battery structure according to claim 6, characterized in that, The protective board connecting section (4-2) further includes a U-shaped second connecting part (4-22). The first connecting part (4-21) and the second connecting part (4-22) are arranged sequentially along the direction close to the lamp board (5) and form an S-shaped structure. In the direction perpendicular to the first direction (X), the second connecting part (4-22) is located on one side of the battery cell tab (6-1) of the battery cell group (7) and is spaced apart from each of the battery cell tabs (6-1).

9. The battery structure according to any one of claims 1 to 4, characterized in that, One end of the FPC (4) is a lamp board connecting section (4-3), and the lamp board (5) is provided with a lamp board connector (5-2); the lamp board connecting section (4-3) is a second bent structure that protrudes in the middle in a direction away from the battery cell group (7), and the free end of the lamp board connecting section (4-3) is electrically connected to the lamp board connector (5-2).

10. The battery structure according to claim 9, characterized in that, It also includes a housing, in which the battery cell assembly (7), the lamp board (5) and the FPC (4) are all disposed; a second accommodating space is provided in the housing; in the second direction (Y), the second accommodating space is located on one side of the joint between the lamp board (5) and the battery cell assembly (7); at least a portion of the second bent structure extends into the second accommodating space.

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