Module-free battery pack

Abstract

The utility model discloses a module-free battery pack which comprises a battery box, a box cover, a plurality of battery cells and a battery cell fixing frame, the battery cells and the battery cell fixing frame are arranged in the battery box, the battery cells are arranged into a plurality of battery cell rows, the battery cell fixing frame is arranged on the outer sides of the battery cell rows in a surrounding mode, and the battery cell rows are tightly pressed in the battery box under the combined action of the battery cell fixing frame and the inner wall of the battery box. Compared with the prior art, due to the fact that processes of stacking and extruding from the battery cells to the modules and the like are not involved, the size of the battery pack is reduced, and the production efficiency of the battery pack is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and in particular relates to a module-free battery pack. Background Art

[0002] In the new energy storage industry, the concept of cell-module-PACK is usually used to manufacture battery packs, but this technical solution is suitable for large-capacity cells (such as 280Ah, 314Ah). Compared with small-capacity cells (such as 100Ah), the modular design not only causes the battery pack to occupy a larger volume, but also has a higher manufacturing cost. Therefore, those skilled in the art are committed to developing a module-free battery pack to meet the demand for small-volume battery packs in the energy storage industry. Utility Model Content

[0003] The utility model aims to provide a module-free battery pack, which can overcome the disadvantage of large volume in the prior art.

[0004] In order to achieve the above technical objectives, the utility model provides a module-free battery pack, including a battery box, a box cover, and a plurality of battery cells and a battery cell fixing frame installed in the battery box, the battery cells are arranged into a plurality of battery cell rows, the battery cell fixing frame is arranged around the outside of the battery cell rows, and the battery cell rows are pressed into the battery box under the joint action of the battery cell fixing frame and the inner wall of the battery box.

[0005] In one embodiment, the battery cell fixing frame includes a first bracket and a second bracket, the length direction of the first bracket is parallel to the length direction of the battery cell row, and the length direction of the second bracket is parallel to the width direction of the battery cell row.

[0006] In one embodiment, the first bracket is provided with a copper bar avoidance groove, and an extension direction of the copper bar avoidance groove is parallel to a length direction of the first bracket.

[0007] In one embodiment, the battery box is provided with heat dissipation holes, fan mounting holes and terminal mounting holes.

[0008] In one embodiment, the battery box includes a mounting portion having an acute angle with the vertical direction, and the mounting portion, the fan mounting hole, and the terminal mounting hole are all arranged on the same side of the battery box.

[0009] In one embodiment, it also includes an insulating sheet attached to the inner wall of the battery box.

[0010] In one embodiment, it also includes a fire protection module installed in the battery box.

[0011] In one embodiment, it further includes a pressure strip installed on the top of the battery cell and an insulating strip installed between the pressure strip and the battery cell.

[0012] In one embodiment, an aluminum bar is further included which is installed on the top of the battery cell.

[0013] In one embodiment, an insulating film is further included which is installed between the battery cells.

[0014] By adopting the above technical solution, the utility model has the following beneficial effects:

[0015] The utility model discloses a module-free battery pack, including a battery box, a box cover, and a plurality of battery cells and a battery cell fixing frame installed in the battery box. The battery cells are arranged into a plurality of battery cell rows, and the battery cell fixing frame is arranged around the outside of the battery cell row. The battery cell row is pressed in the battery box under the joint action of the battery cell fixing frame and the inner wall of the battery box. Compared with the prior art, the utility model does not involve the stacking and extrusion process of the battery cells to the module, so it not only reduces the volume of the battery pack, but also helps to improve the production efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of an assembly structure of a module-free battery pack provided in an embodiment of the utility model;

[0018] Figure 2 for Figure 1 The exploded structural diagram of the assembly structure shown;

[0019] Figure 3 for Figure 1 A schematic diagram of the structure of the battery box in the assembly structure shown;

[0020] Figure 4 for Figure 2 Schematic diagram of the structure of the layering strip at A in the decomposed structure shown.

[0021] Description of reference numerals:

[0022] 1. Battery box; 2. Box cover; 3. Battery cell; 4. Battery cell fixing frame; 5. Pressure strip; 6. Fan; 7. Terminal block; 8. Battery management unit; 9. Aluminum busbar;

[0023] 11. Heat dissipation hole; 12. Fan mounting hole; 13. Terminal mounting hole; 14. Mounting part; 15. Wire harness avoidance slot;

[0024] 41. a first bracket; 42. a second bracket;

[0025] 411, copper bar avoidance groove;

[0026] 51. Fixing holes. DETAILED DESCRIPTION

[0027] The specific embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0030] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0031] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0032] See also Figure 1 , Figure 2, an embodiment of the utility model provides a module-free battery pack, which includes a battery box 1, a box cover 2 and a battery cell 3, wherein the battery cell 3 is installed in the battery box 1, and the box cover 2 is installed on the top of the battery box 1. It should be noted that the battery cell 3 mentioned here refers to the core component that provides power to equipment such as power supplies or power tools. It is the main part of the battery and plays the role of storing and releasing electrical energy. The battery cell 3 is generally composed of a positive electrode, a negative electrode, an electrolyte and a diaphragm, etc., and can store and release electrical energy in a chemical reaction. In the discharge state, a chemical reaction occurs between the positive electrode and the negative electrode, the positive electrode active material loses electrons and combines with ions in the electrolyte to form a compound, and the negative electrode receives electrons, thereby forming an electric current. In the charging state, the opposite reaction occurs. The external power supply supplies current, transfers electrons from the negative electrode to the positive electrode, and the compound is reduced to its original form.

[0033] In some embodiments, in order to increase the capacity of the battery pack, the number of battery cells 3 can be multiple. In the present embodiment, the number of battery cells 3 is twenty-four. Specifically, the twenty-four battery cells 3 are arranged into a plurality of battery cell rows in the battery box 1 so as to better occupy the space in the battery box 1. Compared with the prior art, the utility model does not involve the stacking and extrusion of the battery cells 3 to the module and the like, and eliminates the end plate at the end of the battery pack, which is not only beneficial to reduce the volume of the battery pack, but also beneficial to improve the production efficiency of the battery pack. It should be noted that in order to prevent short circuits between the battery cells 3, in the present embodiment, an insulating film (not shown in the figure) can also be provided between the twenty-four battery cells 3, which is beneficial to ensure the safety of the battery pack in use. Preferably, the capacity of the battery cell 3 is within 100Ah.

[0034] In this embodiment, in order to stably fix the battery cell 3 to ensure sufficient heat dissipation, the battery pack also includes a battery cell fixing frame 4. The battery cell fixing frame 4 is in the shape of a long strip and is arranged around the outside of the battery cell row. Specifically, the battery cell fixing frame 4 includes a first bracket 41 and a second bracket 42, wherein the length direction of the first bracket 41 is parallel to the length direction of the battery cell row, and the length direction of the second bracket 42 is parallel to the width direction of the battery cell row. In this way, when the battery cells 3 are arranged in a certain order in the battery box 1, the battery cell row formed by them can be pressed in the battery box 1 under the joint action of the battery cell fixing frame 4 and the inner wall of the battery box 1, which is beneficial to ensure the normal operation of the battery pack. It should be noted that, relative to the second bracket 42, since the arrangement position of the input and output copper bars of the battery pack is closer to the first bracket 41, in order to avoid affecting the insulation withstand voltage parameters due to the close distance, the first bracket 41 is provided with a copper bar avoidance groove 411, and the extension direction of the copper bar avoidance groove 411 is parallel to the length direction of the first bracket 41. In this way, when the input and output copper bars of the battery pack are electrically connected to the positive and negative electrodes of the battery cells 3 respectively, the copper bar avoidance groove 411 is provided on the first bracket 41, so that the copper bar can cross the top of the first bracket 41, and the insulation withstand voltage parameters of the first bracket 41 are within the expected design range.

[0035] like Figure 3 As shown, the battery box 1 is a box structure, and a receiving space with an opening facing upward is formed in the middle, which is beneficial for accommodating a large number of battery cells 3. It should be noted that, for the purpose of heat dissipation, the battery box 1 is provided with heat dissipation holes 11. Specifically, the number of the heat dissipation holes 11 is multiple, and they are distributed on the side wall of the battery box 1 at a certain interval, so as to improve the heat dissipation efficiency of the battery cells 3.

[0036] Furthermore, for the purpose of installing the fan 6, the battery box 1 is further provided with a fan installation hole 12. In some embodiments, the number of the fan installation holes 12 may be multiple, and in this embodiment, the number of the fan installation holes 12 is two.

[0037] Furthermore, for the purpose of installing the wiring terminals 7 , the battery box 1 is also provided with terminal installation holes 13 , which are beneficial for ensuring that the positive and negative electrodes of the battery cells 3 are electrically connected to the wiring terminals 7 through the input and output copper busbars, respectively.

[0038] Furthermore, in order to install the battery management unit 8, the battery box 1 includes a mounting portion 14 which is acutely angled with the vertical direction. The mounting portion 14 is wedge-shaped, and is arranged on the same side of the battery box 1 as the fan mounting hole 12 and the terminal mounting hole 13. Specifically, the mounting portion 14 extends from the bottom of the battery box 1 toward the top of the battery box 1 in a direction away from the battery box 1. In this way, when the battery management unit 8 is installed on the mounting portion 14, since the mounting portion 14 has a certain inclination angle relative to the vertical direction, it is beneficial to facilitate the plugging and unplugging of the wiring harness connected between the battery management unit 8 and the battery cell 3. It should be noted that the battery management unit 8 mentioned here refers to the component responsible for real-time monitoring, control and protection of the battery pack to ensure efficient, safe and reliable operation of the battery system.

[0039] Furthermore, the battery box 1 is also provided with a wire harness avoidance groove 15, the extension direction of which is parallel to the length direction of the first bracket 41, and is arranged on the same side of the battery box 1 as the fan mounting hole 12, the terminal mounting hole 13 and the mounting portion 14, which is beneficial to facilitate the connection of the wire harness to the battery management unit 8.

[0040] In this embodiment, in order to prevent short circuit, the battery pack also includes an insulating sheet (not marked in the figure) attached to the inner wall of the battery box 1. Specifically, the insulating sheet mentioned here can refer to a PC insulating sheet, because PC (polycarbonate) is a more high-end and thermally stable plastic material, its molecular chain structure is compact and orderly, has good heat resistance, cold resistance and electrical insulation performance, and can maintain excellent performance under extreme temperature conditions.

[0041] In some embodiments, for emergency firefighting considerations, the battery pack further includes a firefighting module installed in the battery box 1. Specifically, the firefighting module mentioned here may refer to an aerogel firefighting module.

[0042] In this embodiment, in order to further fix the battery cell 3, the battery pack also includes a pressure strip 5 installed on the top of the battery cell 3 and an insulating strip (not shown in the figure) installed between the pressure strip 5 and the battery cell 3, wherein one end of the pressure strip 5 is fixedly connected to the inner wall of the battery box 1, and the other end is fixedly connected to the first bracket 41. When the insulating strip and the pressure strip 5 are installed on the top of the battery cell 3 in sequence, since there is an insulating strip between the battery cell 3 and the pressure strip 5, it is also beneficial to prevent the pressure strip 5 from wearing through the blue film of the battery cell 3 and causing a short circuit. Specifically, the insulating strip mentioned here can refer to a silicone strip.

[0043] like Figure 4 As shown, for the convenience of fixing the wire harness, the pressure strip 5 is provided with a fixing hole 51. Specifically, there can be a plurality of fixing holes 51, and the arrangement of the plurality of fixing holes 51 is consistent with the direction of the wire harness, so as to ensure that the direction of the wire harness meets the expected requirements.

[0044] In this embodiment, the battery pack further includes an aluminum bar 9 mounted on the top of the battery cells 3 to achieve series connection between the battery cells 3. Compared with the prior art solution of using copper bars for series connection, the utility model can significantly reduce the manufacturing cost of the battery pack.

[0045] To facilitate understanding of the present invention, the following is a brief description of the general assembly process:

[0046] First, install the fan 6, terminal 7, battery management unit 8, and fire protection module at the preset corresponding positions on the battery box 1 by screws, and then paste the insulating sheet on the inner wall of the battery box 1. Next, put the battery cell 3 into the battery box 1 in the manner of positive and negative poles in series, and then use the battery cell fixing frame 4 to fix the left and front of the battery cell 3. Then, after sticking the insulating strip on the explosion-proof valve position of the battery cell 3, install the pressure strip 5 above the insulating strip to avoid direct contact between the pressure strip 5 and the battery cell 3, and prevent the pressure strip 5 from wearing the blue film of the battery cell 3 and causing a short circuit. At this time, one end of the pressure strip 5 is fixed on the battery box 1, and the other end is fixed on the first bracket 41. Then use laser welding to weld the aluminum bar 9 to the top of the battery cell 3, and then fix the positive and negative poles of the terminal 7 to the total positive and total negative of the battery cell 3 through the total positive and total negative copper bars. Then, the relevant wire harnesses are fixed to the top of the pressure strip 5 and the aluminum row 9, and one end of the collection wire harness is passed through the wire harness avoidance slot 15 of the battery box 1 to be inserted into the interface of the battery management unit 8. Finally, the box cover 2 is installed on the top of the battery box 1.

[0047] Compared with the prior art, the utility model has the following beneficial effects:

[0048] The utility model discloses a module-free battery pack, including a battery box 1, a box cover 2, and a plurality of battery cells 3 and a battery cell fixing frame 4 installed in the battery box 1. The battery cells 3 are arranged into a plurality of battery cell rows, and the battery cell fixing frame 4 is arranged around the outside of the battery cell row. The battery cell row is pressed in the battery box 1 under the joint action of the battery cell fixing frame 4 and the inner wall of the battery box 1. Compared with the prior art, the utility model does not involve the stacking and extrusion process of the battery cells 3 to the module, so it not only reduces the volume of the battery pack, but also helps to improve the production efficiency of the battery pack.

[0049] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A module-free battery pack, characterized in that: The invention comprises a battery box (1), a box cover (2), a plurality of battery cells (3) and a battery cell fixing frame (4) installed in the battery box (1), wherein the battery cells (3) are arranged into a plurality of battery cell rows, the battery cell fixing frame (4) is arranged around the outside of the battery cell rows, and the battery cell rows are pressed tightly in the battery box (1) under the combined action of the battery cell fixing frame (4) and the inner wall of the battery box (1).

2. The module-free battery pack according to claim 1, characterized in that: The battery cell fixing frame (4) comprises a first bracket (41) and a second bracket (42); the length direction of the first bracket (41) is parallel to the length direction of the battery cell row, and the length direction of the second bracket (42) is parallel to the width direction of the battery cell row.

3. The module-free battery pack according to claim 2, characterized in that: The first bracket (41) is provided with a copper bar avoidance groove (411), and the extension direction of the copper bar avoidance groove (411) is parallel to the length direction of the first bracket (41).

4. The module-free battery pack according to claim 1, characterized in that: The battery box (1) is provided with a heat dissipation hole (11), a fan mounting hole (12) and a terminal mounting hole (13).

5. The module-free battery pack according to claim 4, characterized in that: The battery box (1) comprises a mounting portion (14) having an acute angle with the vertical direction, and the mounting portion (14) and the fan mounting hole (12) and the terminal mounting hole (13) are all arranged on the same side of the battery box (1).

6. The module-free battery pack according to claim 1, characterized in that: It also includes an insulating sheet adhered to the inner wall of the battery box (1).

7. The module-free battery pack according to claim 1, wherein: It also includes a fire protection module installed in the battery box (1).

8. The module-free battery pack according to claim 1, wherein: It also includes a pressure strip (5) installed on the top of the battery core (3) and an insulating strip installed between the pressure strip (5) and the battery core (3).

9. The module-free battery pack according to claim 1, wherein: It also includes an aluminum row (9) installed on the top of the battery core (3).

10. The module-free battery pack according to claim 1, wherein: It also includes an insulating film installed between the battery cells (3).

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