A battery pack of single cells arranged in series

Abstract

The application relates to a battery pack with single cells arranged in series, which comprises a box body, a box cover, cells, a circuit protection plate, a charging connector and a discharging connector, and further comprises a lower positioning frame and an upper positioning frame, a plurality of positioning grooves for fixing the cells are arranged on the lower positioning frame and the upper positioning frame, the positioning grooves are arranged in multiple rows, and the two adjacent rows of the positioning grooves are arranged staggeredly, a vertical plate is arranged at the right end in the box body, the circuit protection plate is vertically arranged on the end face of the vertical plate, horizontal electric connection sheets for connecting the cells in the same row of the positioning grooves are arranged on the top surface of the upper positioning frame, longitudinal electric connection sheets for connecting the cells in the two adjacent rows of the positioning grooves are arranged at the end of the upper positioning frame, and positive electrode connection plates and negative electrode connection plates connected with the electrodes of the cells are arranged at the right end of the upper positioning frame. The application belongs to the technical field of the battery pack, and the electric connection sheets are integrated on the upper positioning frame, so that the connecting space occupied by the traditional wire harness is completely saved.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and in particular to a battery pack with single cells connected in series. Background Technology

[0002] In recent years, with the rapid development of new energy vehicles, energy storage systems, and other fields, the performance requirements for power battery packs, as core energy components, have been increasing. However, traditional battery packs still face many technical bottlenecks in practical applications:

[0003] Low space utilization: Existing battery packs mostly use loosely arranged or simply stacked cells, resulting in insufficient internal space utilization and difficulty in improving energy density. Especially in single-cell series structures, the connection space between cells occupies a large area, further limiting the overall capacity of the battery pack.

[0004] Complex connection structure: Traditional solutions rely on numerous wire harnesses or soldering to achieve series / parallel connections between cells, which not only increases internal resistance and heat generation risks but also leads to a higher failure rate due to the excessive number of soldering points. In addition, the complex wiring process reduces production efficiency and increases manufacturing costs.

[0005] Insufficient stability and safety: The single method of cell fixation (such as adhesive or strapping) makes them prone to displacement under vibration or impact, which may cause short circuits or thermal runaway. At the same time, uneven current distribution may lead to localized overheating, further threatening the safety performance of the battery pack.

[0006] Poor maintenance and scalability: The modular design is insufficient, making it difficult to quickly replace damaged cells or circuits, and the existing structure is difficult to flexibly adapt to different capacity requirements.

[0007] Therefore, there is an urgent need for a new type of battery pack solution that can improve energy density, optimize connection structure, enhance stability, and take into account both safety and maintainability. Utility Model Content

[0008] Therefore, it is necessary to provide a battery pack with single cells connected in series, and the specific technical solution is as follows.

[0009] A battery pack with single cells connected in series includes a housing, a cover, cells, a circuit protection board, a charging connector, and a discharging connector. It also includes a lower positioning frame and an upper positioning frame located at the left end of the housing. The lower and upper positioning frames have multiple positioning slots for fixing the cells, arranged in multiple rows with adjacent rows staggered. A vertical plate is located at the right end of the housing, and the circuit protection board is vertically mounted on the end face of the vertical plate. A stepped structure is located at the right end of the cover, and the charging and discharging connectors are vertically mounted on the stepped surface of the stepped structure. The top surface of the upper positioning frame has a transverse connecting piece for connecting cells in the same row of positioning slots in series. The end of the upper positioning frame has a longitudinal connecting piece for connecting cells in adjacent rows of positioning slots in series. Positive and negative electrode connecting plates, connected to the electrodes of the cells, are located on both sides of the right end of the upper positioning frame.

[0010] Furthermore, the horizontal and vertical electrical connectors connect multiple battery cells in the positioning slots in series to form a labyrinthine current transmission trajectory.

[0011] Furthermore, one end of the transverse electrode is provided with a first positive plate, and the other end of the transverse electrode is provided with a first negative L-shaped plate.

[0012] Furthermore, the first positive electrode plate has first slots on both sides, and the top surface of the upper positioning frame has a first limiting plate that is adapted to the two sides of the first positive electrode plate. The inner side of the first limiting plate has a first protrusion that is adapted to the first slot.

[0013] Furthermore, the longitudinal contact plate has a U-shaped plate structure, and the longitudinal contact plate includes a second positive plate and a second negative L-shaped plate, with a longitudinal support plate connecting the second positive plate and the second negative L-shaped plate.

[0014] Furthermore, the longitudinal support plate is provided with second slots on both sides, and the top surface of the upper positioning frame is provided with a second limiting plate that is adapted to the two sides of the longitudinal support plate. The inner side of the second limiting plate is provided with a second protrusion that is adapted to the second slot.

[0015] Furthermore, the upper positioning frame has protrusions on both sides of the right end, and electrical connection bolts are provided through the protrusions. The positive and negative electrical connection plates are fixed on the protrusions by the electrical connection bolts. The electrical connection bolts are electrically connected to the positive and negative interfaces located on both sides of the upper end of the circuit protection plate through wires.

[0016] Furthermore, the top surface of the box cover is provided with a recessed groove, and a first handle is hinged in the recessed groove.

[0017] Furthermore, a retractable second handle is provided on the right end face of the box.

[0018] Compared with existing technologies, this utility model has the following beneficial effects:

[0019] The battery pack of this utility model, with its single-cell series configuration, adopts a staggered multi-row positioning slot design, which makes the cell arrangement more compact and effectively improves the space utilization rate by more than 30%. The modular structure of the upper and lower positioning frames ensures the fixing strength while minimizing the occupation of non-functional space. The design of integrating the connector into the upper positioning frame completely eliminates the connection space occupied by traditional wire harnesses. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural view of a battery pack with single cells connected in series according to this utility model;

[0022] Figure 2 This is an exploded view of the internal structure of a battery pack with single cells connected in series according to this utility model.

[0023] Figure 3 This is a top view of the internal structure of the battery pack with single cells connected in series according to this utility model;

[0024] Figure 4 This is an enlarged schematic diagram of the box structure in this utility model;

[0025] Figure 5 This is an enlarged schematic diagram of the structure of the transverse electrical contact piece in this utility model;

[0026] Figure 6 This is an enlarged schematic diagram of the longitudinal electrical connector in this utility model.

[0027] Explanation of reference numerals in the attached drawings: 1. Box body; 2. Box cover; 3. Battery cell; 4. Circuit protection board; 5. Charging connector; 6. Discharging connector; 7. Lower positioning frame; 8. Upper positioning frame; 9. Positioning groove; 10. Vertical plate; 11. Stepped structure; 12. Horizontal connecting piece; 13. Longitudinal connecting piece; 14. Positive electrode connecting plate; 15. Negative electrode connecting plate; 16. First positive electrode plate; 17. First negative electrode L-shaped plate; 18. First slot; 19. First limiting plate; 20. First protrusion; 21. Second positive electrode plate; 22. Second negative electrode L-shaped plate; 23. Longitudinal support plate; 24. Second slot; 25. Second limiting plate; 26. Second protrusion; 27. Boss; 28. Connecting bolt; 29. ​​Sink; 30. First handle; 31. Second handle; 32. Screw hole. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] The embodiments of this utility model will be described below based on its overall structure.

[0030] Reference Figures 1-6As shown, this embodiment provides a battery pack with single cells connected in series, including a housing 1, a housing cover 2, a cell 3, a circuit protection board 4, a charging connector 5, and a discharging connector 6. It also includes a lower positioning frame 7 and an upper positioning frame 8 located at the left end of the housing 1. The lower positioning frame 7 and the upper positioning frame 8 have multiple positioning slots 9 for fixing the cell 3, arranged in multiple rows with adjacent rows staggered. A vertical plate 10 is located at the right end of the housing 1, and the circuit protection board 4 is vertically mounted. On the end face of the upright plate 10, the right end of the cover 2 is provided with a stepped structure 11, and the charging connector 5 and the discharging connector 6 are vertically installed on the stepped surface of the stepped structure 11. The top surface of the upper positioning frame 8 is provided with a horizontal connecting piece 12 that connects the battery cells 3 in the same row of positioning slots 9 in series. The end of the upper positioning frame 8 is provided with a vertical connecting piece 13 that connects the battery cells 3 in two adjacent rows of positioning slots 9 in series. The right side of the upper positioning frame 8 is provided with a positive electrode connecting plate 14 and a negative electrode connecting plate 15 that are connected to the electrodes of the battery cells 3. In the battery pack with single-cell series connection of this utility model, the battery cells 3 are fixed between the lower positioning frame 7 and the upper positioning frame 8 through the positioning slots 9 to form a stable staggered array. The horizontal connecting piece 12 and the vertical connecting piece 13 are directly integrated on the upper positioning frame 8, replacing the traditional wire harness, realizing the series connection of the battery cells, improving the space utilization rate, optimizing the battery cell arrangement density, simplifying the circuit connection, reducing welding points and internal resistance, increasing the energy density by more than 30%, and ensuring that the battery cells are fixed firmly and have enhanced vibration resistance.

[0031] Specifically, the lateral and longitudinal connecting plates 12 and 13 connect multiple battery cells 3 within the positioning slots 9 in series to form a labyrinthine current transmission trajectory. In this embodiment, the current flows through a specific path (lateral + longitudinal series) of the connecting plates, optimizing the current distribution, balancing the battery cell load, avoiding localized overheating, and improving the safety and lifespan of the battery pack.

[0032] Specifically, one end of the transverse electrode 12 is provided with a first positive plate 16, and the other end of the transverse electrode 12 is provided with a first negative L-shaped plate 17. The first positive plate 16 of the transverse electrode 12 is welded and fixed to the positive electrode protrusion at the top of the battery cell 3, and the first negative L-shaped plate 17 of the transverse electrode 12 is welded and fixed to the negative plate at the top of an adjacent battery cell 3.

[0033] Specifically, the first positive electrode plate 16 has first slots 18 on both sides, and the top surface of the upper positioning frame 8 has a protruding first limiting plate 19 that adapts to the two sides of the first positive electrode plate 16. The inner side of the first limiting plate 19 has a first protruding strip 20 that matches the first slots 18. In this embodiment, the top surface of the upper positioning frame 8 has a through hole communicating with the positioning groove 9. The first positive electrode plate 16 is connected to the positive electrode of the battery cell, and the first negative electrode L-shaped plate 17 is connected to the negative electrode of the adjacent battery cell, realizing series connection. The slots and limiting structure ensure accurate positioning of the connector; simplify the assembly process, avoid displacement of the connector, reduce contact resistance, and improve conductivity.

[0034] Specifically, the longitudinal contact plate 13 has a U-shaped plate structure. The longitudinal contact plate 13 includes a second positive plate 21 and a second negative L-shaped plate 22. A longitudinal support plate 23 is connected between the second positive plate 21 and the second negative L-shaped plate 22. The longitudinal support plate 23 is connected to the top surface of the upper positioning frame 8. The upper positioning frame 8 has an insulating structure.

[0035] Specifically, the longitudinal support plate 23 has second slots 24 on both sides, and the top surface of the upper positioning frame 8 has a protruding second limiting plate 25 that adapts to the two sides of the longitudinal support plate 23. The inner side of the second limiting plate 25 has a second protruding strip 26 that matches the second slots 24. In this embodiment, the longitudinal connecting piece 13 connects multiple rows of battery cells, completing multi-row series connection, optimizing the connection of multiple rows of battery cells, reducing the use of wiring harnesses, improving structural compactness, and reducing the failure rate.

[0036] Specifically, refer to Figure 3 and Figure 4 As shown, the upper positioning frame 8 has protrusions 27 on both sides of the right end, and electrical connection bolts 28 are provided through the protrusions 27 to fix the positive terminal plate 14 and the negative terminal plate 15 on the protrusions 27. The electrical connection bolts 28 are electrically connected to the positive and negative terminals located on both sides of the upper end of the circuit protection plate 4 through wires. The top of the upright plate 10 has screw holes 32, and the upright plate 10 has an insulating mounting plate. The circuit protection plate 4 is fixed to the insulating mounting plate by bolts. The top of the insulating mounting plate is bent to form a bent plate that connects to the top surface of the upright plate 10. The bent plate is connected to the screw holes 32 by bolts.

[0037] Specifically, refer to Figure 1 As shown, the top surface of the cover 2 is provided with a recess 29, and a first handle 30 is hinged within the recess 29; a retractable second handle 31 is provided on the right end face of the body 1. The entire battery pack can be lifted by either the first handle 30 or the second handle 31. The handles facilitate handling, enhance portability and assembly efficiency, and improve user convenience.

[0038] Specific usage process:

[0039] Multiple horizontal contact plates 12 and vertical contact plates 13 are installed on the upper positioning frame 8 to form a maze-like, meandering installation trajectory. The battery cell 3 is inserted into the positioning slot 9 of the lower positioning frame 7, which covers and fixes the upper positioning frame 8. This allows the multiple horizontal contact plates 12 and vertical contact plates 13 on the upper positioning frame 8 to quickly connect each battery cell 3 in series. The horizontal contact plates 12 and vertical contact plates 13 are then connected and fixed to the positive and negative terminals of the battery cell 3 by welding.

[0040] The circuit protection board 4 is fixed on the upright plate 10, and the positive terminal board 14 and the negative terminal board 15 are connected by the electrical connection bolt 28 and wires.

[0041] The fixed charging 5 and discharging connector 6 on the cover 2 are connected to the charging and discharging interface of the circuit protection board 4 by wires. The cover 2 is then connected to the box body 1 and locked by bolts.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The above embodiments only illustrate one or more implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery pack with single cells connected in series, comprising a housing (1), a cover (2), cells (3), a circuit protection board (4), a charging connector (5), and a discharging connector (6), characterized in that, It also includes a lower positioning frame (7) and an upper positioning frame (8) provided at the left end of the housing (1). The lower positioning frame (7) and the upper positioning frame (8) are provided with multiple positioning slots (9) for fixing the battery cell (3). The multiple positioning slots (9) are arranged in multiple rows, and adjacent rows of positioning slots (9) are staggered. The right end of the housing (1) is provided with a vertical plate (10). The circuit protection board (4) is vertically installed on the end face of the vertical plate (10). The right end of the housing cover (2) is provided with a stepped structure (11). The charging connector (5) and the discharging connector (6) are vertically installed on the stepped surface of the stepped structure (11); the top surface of the upper positioning frame (8) is provided with a horizontal connecting piece (12) that connects the battery cells (3) in the same row of positioning slots (9) in series; the end of the upper positioning frame (8) is provided with a vertical connecting piece (13) that connects the battery cells (3) in two adjacent rows of positioning slots (9) in series; the right side of the upper positioning frame (8) is provided with a positive electrode connecting plate (14) and a negative electrode connecting plate (15) that are connected to the electrodes of the battery cells (3).

2. A battery pack with single cells connected in series according to claim 1, characterized in that, The horizontal contact plate (12) and the vertical contact plate (13) connect the multiple battery cells (3) in the positioning slots (9) in series to form a labyrinthine current transmission trajectory.

3. A battery pack with single cells connected in series according to claim 2, characterized in that, One end of the transverse electrode plate (12) is provided with a first positive plate (16), and the other end of the transverse electrode plate (12) is provided with a first negative L-shaped plate (17).

4. A battery pack with single cells connected in series according to claim 3, characterized in that, The first positive electrode plate (16) has a first slot (18) on both sides. The top surface of the upper positioning frame (8) has a first limiting plate (19) that is adapted to both sides of the first positive electrode plate (16). The inner side of the first limiting plate (19) has a first protrusion (20) that is adapted to the first slot (18).

5. A battery pack with single cells connected in series according to claim 4, characterized in that, The longitudinal contact plate (13) has a U-shaped plate structure. The longitudinal contact plate (13) includes a second positive plate (21) and a second negative L-shaped plate (22). A longitudinal support plate (23) is connected between the second positive plate (21) and the second negative L-shaped plate (22).

6. A battery pack with single cells connected in series according to claim 5, characterized in that, The longitudinal support plate (23) has a second slot (24) on both sides. The upper positioning frame (8) has a second limiting plate (25) protruding from its top surface, which is adapted to the two sides of the longitudinal support plate (23). The inner side of the second limiting plate (25) is provided with a second protrusion (26) that is adapted to the second slot (24).

7. A battery pack with single cells connected in series according to any one of claims 1-6, characterized in that, The upper positioning frame (8) has protrusions (27) on both sides of the right end. A power connection bolt (28) is provided on the protrusion (27). The positive terminal plate (14) and the negative terminal plate (15) are fixed on the protrusion (27) by the power connection bolt (28). The power connection bolt (28) is electrically connected to the positive and negative terminals located on both sides of the upper end of the circuit protection board (4) by a wire.

8. A battery pack with single cells connected in series according to claim 7, characterized in that, The top surface of the box cover (2) is provided with a recess (29), and a first handle (30) is hinged in the recess (29).

9. A battery pack with single cells connected in series according to claim 8, characterized in that, The right end face of the box (1) is provided with a retractable second handle (31).

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