Low-voltage lithium battery structure

Abstract

The utility model discloses a low pressure lithium cell structure, including upper cover, fixing piece, BMS module and module assembly, the upper cover has an assembly face, a plurality of fixing piece set up on the assembly face, BMS module is fixed on the assembly face through fixing piece, the module assembly includes the electric core main part and negative output pole base, negative output pole base sets up in the electric core main part top and with the negative pole of electric core main part electric connection, B the interface of BMS module is connected with negative output pole base through wiring harness. The utility model discloses through changing the assembly mode of BMS module makes the assembly process of low pressure lithium cell become simple easy operation, therefore, has improved the assembly efficiency and assembly accuracy of low pressure lithium cell, and has saved the production cost of low pressure lithium cell.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage lithium battery technology, specifically a low-voltage lithium battery structure. Background Technology

[0002] Low-voltage lithium batteries are primarily used in automobiles, industrial equipment, energy storage systems, and aerospace, playing a crucial role, especially in traditional gasoline vehicles and new energy vehicles, such as in automotive parking air conditioning systems. However, existing BMS (Battery Monitoring and Management System) for low-voltage lithium batteries used in parking air conditioning systems are typically fixed to a mounting plate on the top of the module or on the side plate of the module using specially designed components. Furthermore, the B-interface of the BMS is connected to the negative terminal of the module via a double-sealed negative terminal cover. This installation method makes the production and assembly process of low-voltage lithium batteries complex, resulting in low assembly efficiency and a high risk of significant errors. Therefore, it is necessary to improve upon the shortcomings of the existing technology. Utility Model Content

[0003] The purpose of this invention is to provide a low-voltage lithium battery structure to solve the technical problems of low assembly efficiency and large assembly error in the existing BMS assembly method of low-voltage lithium batteries.

[0004] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a low-voltage lithium battery structure, including:

[0006] The upper cover has a mounting surface;

[0007] Fasteners, a plurality of said fasteners being disposed on the assembly surface;

[0008] The BMS module is fixed to the assembly surface by the fastener.

[0009] The module assembly includes a battery cell body and a negative output terminal base. The negative output terminal base is disposed on the top of the battery cell body and electrically connected to the negative terminal post of the battery cell body. The B- interface of the BMS module is connected to the negative output terminal base through a wiring harness.

[0010] In some embodiments, the fastener includes nuts and screws, with a plurality of nuts evenly disposed on the mounting surface, each nut having an internal thread in the middle, and a plurality of screws disposed on the top of the BMS module, each screw having an external thread that matches the internal thread on its exterior.

[0011] In one embodiment, the nut and the top cover are integrally formed.

[0012] In some embodiments, a CCS module is also included, which is disposed on both sides of the top of the cell body and connected to the tabs of the cell body.

[0013] In some embodiments, the device further includes retaining rings, a plurality of retaining rings being disposed on the top of the battery cell body, the top cover being provided with a forced start switch, the forced start switch being connected to the BMS module via a wiring harness, and the wiring harness passing through the retaining rings, the plurality of retaining rings defining the wiring path of the wiring harness.

[0014] In some embodiments, the battery cell body includes multiple battery cells, end plates, and strapping. The multiple battery cells are arranged side by side, and two end plates are respectively disposed on the outer surfaces of the battery cells located at both ends. The strapping is tied to the outside of the battery cells and the end plates to fix the multiple battery cells.

[0015] In some embodiments, the cell body further includes a plurality of heat insulation components, with one heat insulation component disposed between each two adjacent cell units.

[0016] In some embodiments, the module assembly further includes a positive output terminal base, which is disposed on the top of the cell body on the side opposite to the negative output terminal base, and the positive output terminal base is electrically connected to the positive terminal post of the cell body.

[0017] In some embodiments, the module assembly further includes a heating film and a pressure strip, the pressure strip being disposed on one side of the battery cell body near the top cover, and the heating film being disposed on one side of the battery cell body away from the top cover.

[0018] In some embodiments, a lower housing is further included, which is fastened to the upper cover to form a receiving cavity for placing the module assembly, and the heating film is disposed between the inner bottom surface of the lower housing and the battery cell body.

[0019] Compared with the prior art, the beneficial effects of this utility model mainly include:

[0020] The low-voltage lithium battery structure provided by this utility model has a BMS module that is fixed to the upper cover by a fastener on the upper cover mounting surface. The module assembly includes a negative output electrode base. Thus, the B-interface of the BMS module can be pre-assembled and connected to the negative output electrode base via a wiring harness. The pre-assembled BMS module is then fixed to the upper cover by the fastener, simplifying the BMS assembly process and significantly improving assembly efficiency and accuracy. Furthermore, by eliminating the need for a secondary negative electrode cover, this utility model also reduces the production cost of the low-voltage lithium battery. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the low-voltage lithium battery described in this utility model;

[0022] Figure 2 yes Figure 1 Exploded view;

[0023] Figure 3 This is a schematic diagram of the structure of the upper cover described in this utility model;

[0024] Figure 4 This is a structural schematic diagram of the module assembly described in this utility model (with a BMS module installed).

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Top cover; 11. Assembly surface; 12. Forced start switch.

[0027] 2. Fasteners, 21. Nut, 22. Screw,

[0028] 3. BMS module,

[0029] 4. Module assembly; 41. Battery cell body; 411. Individual battery cell; 412. End plate; 413. Bundling strap; 42. Negative output electrode base; 43. Positive output electrode base; 44. Heating film; 45. Pressure strip.

[0030] 5. CCS module,

[0031] 6. Snap ring,

[0032] 7. Lower the box. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] This invention addresses the shortcomings of existing BMS installation methods in low-voltage lithium batteries by proposing a novel low-voltage lithium battery structure. This new structure alters the BMS installation method, thereby improving the assembly efficiency and precision of low-voltage lithium batteries and reducing their production costs.

[0035] It is understood that the low-voltage lithium battery structure provided by this utility model can be used not only for car parking air conditioning, but also for other vehicle equipment such as start-stop systems, audio-visual entertainment, radar, and cameras, including but not limited to 12V, 24V and 48V.

[0036] Please refer to the following: Figures 1-4As shown, the present invention provides a low-voltage lithium battery structure, including a top cover 1, a fixing member 2, a BMS module 3, and a module assembly 4. The top cover 1 has a mounting surface 11; a plurality of fixing members 2 are disposed on the mounting surface 11; the BMS module 3 is fixed on the mounting surface 11 by the fixing members 2; the module assembly 4 includes a cell body 41 and a negative output electrode base 42. The negative output electrode base 42 is disposed on the top of the cell body 41 and electrically connected to the negative electrode post of the cell body 41. The B- interface of the BMS module 3 is connected to the negative output electrode base 42 through a wiring harness.

[0037] This invention, by setting a fixing member 2 on the mounting surface 11 of the upper cover 1, allows the BMS module 3 to be fixedly installed on the upper cover 1. A negative output electrode base 42 is set on one side of the top of the cell body 41. The negative output electrode base 42 is pre-assembled and connected to the B- interface of the BMS module 3 via a wiring harness. The pre-assembled BMS module 3 is then fixed to the upper cover using the fixing member. This simplifies the BMS assembly process and significantly improves assembly efficiency and accuracy. Furthermore, by eliminating the need for a secondary negative electrode cover, this invention also reduces the production cost of low-voltage lithium batteries.

[0038] In one embodiment, the fastener 2 includes nuts 21 and screws 22. A plurality of nuts 21 are evenly disposed on the mounting surface 11, and each nut 21 has an internal thread in the middle. A plurality of screws 22 are disposed on the top of the BMS module 3, and each screw 22 has an external thread that matches the internal thread.

[0039] In the above technical solution, the nut 21 can be welded to the assembly surface 11 or it can be an integrally formed structure with the upper cover 1. In order to ensure the strength of the lithium battery, in the preferred embodiment, the nut 21 adopts an integral structure formed with the upper cover 1 by injection molding. During assembly, the BMS module 3 can be quickly fixed on the upper cover 1 by the cooperation of the screw 22 and the nut 21.

[0040] In one embodiment, the module assembly 4 includes a battery cell body 41, a negative output electrode base 42, a positive output electrode base 43, a heating film 44, and a pressure plate strip 45. The negative output electrode base 42 and the positive output electrode base 43 are respectively disposed on the top two sides of the battery cell body 41. The negative output electrode base 42 is electrically connected to the negative electrode post of the battery cell body 41. The B- interface of the BMS module 3 is connected to the negative output electrode base 42 through a wiring harness. The positive output electrode base 43 is electrically connected to the positive electrode post of the battery cell body 41. The pressure plate strip 45 is disposed on the side of the battery cell body 41 near the top cover 1, and the heating film 46 is disposed on the side of the battery cell body 41 away from the top cover.

[0041] In one embodiment, the battery cell body 41 includes a plurality of battery cell units 411, end plates 412 and binding straps 413. The plurality of battery cell units 411 are arranged side by side, and two end plates 412 are respectively disposed on the outer surfaces of the battery cell units 411 located at both ends. The binding straps 413 are bound to the outside of the battery cell units 411 and the end plates 412 for fixing the plurality of battery cell units 411.

[0042] In one embodiment, the cell body 41 further includes a plurality of heat insulation components, with one heat insulation component disposed between each two adjacent cell units.

[0043] In this embodiment, the end plate 412 is made of extruded profile and can be compatible with multiple battery cells 411 of the same size. The end plate 413 is provided with mounting holes for installation with the lower housing 7 and the pressure strip 45. Foam is provided between each battery cell 411. The pressure strip 45 is made of Q235 material.

[0044] In this embodiment, the positive output base 43 is provided with a positive adapter bar and a positive output bar, and the BMS module 3 is provided with a connection bar and a negative output bar. The positive output bar and the negative output bar are respectively connected to the positive terminal and the negative terminal on the upper cover 1.

[0045] In one embodiment, the low-voltage lithium battery further includes a CCS module 5 manufactured by a vacuum forming process. The CCS module 5 is disposed on both sides of the top of the cell body 41 and connected to the tabs of the cell body 41.

[0046] In this embodiment, the CCS module 5 is made using a vacuum forming + wire harness solution. A communication CAN point is set on the outside of the wire harness tail end. Its nickel sheet does not need to be additionally soldered. Only the busbar and the electrode tab need to be soldered, which saves labor costs.

[0047] In one embodiment, the low-voltage lithium battery further includes retaining rings 6, and multiple retaining rings 6 are disposed on the top of the cell body 41. The top cover 1 is provided with a forced start switch 12, which is connected to the BMS module 3 through a wiring harness. The wiring harness passes through the retaining rings 6, that is, the multiple retaining rings 6 define the routing path of the wiring harness. Compared with the existing communication wiring harnesses which have no restricted routing path, the wiring in this embodiment is clear and not easy to be pressed.

[0048] In one embodiment, the low-voltage lithium battery further includes a lower housing 7, which is fastened to the upper cover 1 to form a receiving cavity for placing the module assembly 4, and the heating film 44 is disposed between the inner bottom surface of the lower housing 7 and the cell body 41.

[0049] In summary, the low-voltage lithium battery structure provided by this utility model simplifies the assembly process by changing the assembly method of the BMS module 5, thereby improving the assembly efficiency and accuracy of the low-voltage lithium battery and saving on the production cost of the low-voltage lithium battery.

[0050] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A low-voltage lithium battery structure, characterized in that, include: The upper cover has a mounting surface; Fasteners, a plurality of said fasteners being disposed on the assembly surface; The BMS module is fixed to the assembly surface by the fastener. The module assembly includes a battery cell body and a negative output terminal base. The negative output terminal base is disposed on the top of the battery cell body and electrically connected to the negative terminal post of the battery cell body. The B- interface of the BMS module is connected to the negative output terminal base through a wiring harness.

2. The low-voltage lithium battery structure according to claim 1, characterized in that, The fastener includes nuts and screws. A plurality of nuts are evenly arranged on the mounting surface, and each nut has an internal thread in the middle. A plurality of screws are arranged on the top of the BMS module, and each screw has an external thread that matches the internal thread.

3. The low-voltage lithium battery structure according to claim 2, characterized in that, The nut and the top cover are integrally formed.

4. The low-voltage lithium battery structure according to claim 1, characterized in that, It also includes a CCS module, which is disposed on both sides of the top of the cell body and connected to the tabs of the cell body.

5. The low-voltage lithium battery structure according to claim 1, characterized in that, It also includes retaining rings, a plurality of retaining rings being disposed on the top of the battery cell body, the top cover being provided with a forced start switch, the forced start switch being connected to the BMS module via a wiring harness, and the wiring harness passing through the retaining rings, the plurality of retaining rings defining the wiring path of the wiring harness.

6. The low-voltage lithium battery structure according to claim 1, characterized in that, The battery cell body includes multiple battery cell units, end plates, and strapping straps. The multiple battery cell units are arranged side by side, and two end plates are respectively disposed on the outer surfaces of the battery cell units located at both ends. The strapping straps are tied to the outside of the battery cell units and the end plates to fix the multiple battery cell units.

7. The low-voltage lithium battery structure according to claim 6, characterized in that, The battery cell body also includes multiple heat insulation components, with one heat insulation component disposed between each two adjacent battery cell units.

8. The low-voltage lithium battery structure according to claim 1, characterized in that, The module assembly also includes a positive output electrode base, which is disposed on the top of the battery cell body on the side opposite to the negative output electrode base, and the positive output electrode base is electrically connected to the positive electrode post of the battery cell body.

9. The low-voltage lithium battery structure according to claim 1, characterized in that, The module assembly also includes a heating film and a pressure strip. The pressure strip is disposed on one side of the battery cell body near the top cover, and the heating film is disposed on one side of the battery cell body away from the top cover.

10. The low-voltage lithium battery structure according to claim 9, characterized in that, It also includes a lower housing, which is fastened to the upper cover to form a receiving cavity for placing the module assembly, and the heating film is disposed between the inner bottom surface of the lower housing and the battery cell body.

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