Low-voltage lithium battery pack structure and lithium battery pack

Abstract

The utility model discloses a low pressure lithium cell pack structure and lithium cell package, low pressure lithium cell pack structure includes upper cover assembly, box body assembly and electric core module, the upper cover assembly inside contains the insert of integral moulding with it, the box body assembly inside has the cavity of placing, electric core module sets up in the cavity of placing and with the cavity of placing interference fit, the upper cover assembly cover is located the opening end of box body assembly and with box body assembly detachable connection, and the electric core module is connected with the upper cover assembly through part insert. The utility model solves the technical problem of the present low pressure lithium cell pack package assembly process cumbersome, production cost is higher and the volume of group after is bigger.

Description

Technical Field

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

[0002] In the traditional production process of low-voltage lithium batteries, there are many complex assembly steps. For example, the cell modules are usually connected to the box and the box cover using some standardized connectors, which makes the production process cumbersome, labor-intensive, and costly, and is not conducive to automation and mass production. At the same time, the existing installation method leaves a large gap between the cell module and the box, resulting in low space utilization of the box and a large overall size of the assembled pack, which is not conducive to its application in other devices. Utility Model Content

[0003] In view of this, the present invention proposes a low-voltage lithium battery pack structure and a lithium battery pack to solve the technical problems of cumbersome assembly process, high production cost and large size after assembly of existing low-voltage lithium battery packs.

[0004] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This utility model provides a low-voltage lithium battery pack structure, including: A top cover assembly, wherein the top cover assembly contains an insert integrally formed therewith; A housing assembly, wherein the housing assembly has an internal storage cavity; A battery cell module is disposed in the placement cavity and is interference-fitted with the placement cavity. The upper cover assembly is disposed on the opening end of the housing assembly and is detachably connected to the housing assembly. The battery cell module is connected to the upper cover assembly through part of the insert.

[0005] In some embodiments, the insert includes positive and negative copper busbars, which are connected to the positive and negative terminals of the battery cell module by bolts.

[0006] In some embodiments, the insert further includes a positioning post, and the Pack structure further includes a BMS circuit board. The BMS circuit board is mounted in the upper cover assembly via the positioning post, and the P+ and P- terminals of the BMS circuit board are respectively connected to the positive and negative copper busbars via bolts. The positive and negative terminals of the battery cell module are respectively connected to the positive and negative terminals of the BMS circuit board.

[0007] In some embodiments, the insert further includes a positive mounting hole and a negative mounting hole, which correspond to the positive and negative terminals of the battery cell module and the BMS circuit board, respectively.

[0008] In some embodiments, the Pack structure further includes two small covers, which are respectively installed in the positive electrode mounting hole and the negative electrode mounting hole.

[0009] In some embodiments, a thermally conductive adhesive layer is laid on the surface of the cavity wall of the placement cavity, and the thermally conductive adhesive layer is wrapped around the outside of the battery cell module.

[0010] In some embodiments, a groove is provided at the location where the thermally conductive adhesive layer is laid in the placement cavity, and the groove is filled with sealant.

[0011] In some embodiments, the battery module includes a carrier, a battery cell, and foam. A plurality of battery cells are stacked, and a plurality of foams are disposed between each pair of adjacent battery cells. The carrier is fixed to one end of the battery cell and is connected to the insert.

[0012] In some embodiments, the battery cell module further includes an FPCB circuit board and a PC insulation board, which are mounted on the carrier.

[0013] In addition, this utility model also provides a lithium battery pack, which has the low-voltage lithium battery pack structure provided by this utility model above.

[0014] Compared with the prior art, the beneficial effects of this utility model mainly include: The low-voltage lithium battery pack structure provided by this utility model has an upper cover assembly that is an injection-molded part containing inserts. It has a simple structure, low cost, and high strength. The placement cavity of the cell module and the housing assembly is interference-fitted and connected to the upper cover assembly through inserts. Thus, the assembly process of the low-voltage lithium battery pack structure provided by this utility model is simple, improving assembly efficiency, reducing labor intensity, and lowering production costs. At the same time, the gap between the cell module and the housing assembly is reduced, thereby reducing the overall volume of the assembled pack structure, which is beneficial for subsequent application in other devices. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the low-voltage lithium battery pack described in this utility model; Figure 2 yes Figure 1 Exploded view; Figure 3 This is a structural schematic diagram of the upper cover assembly described in this utility model; Figure 4 This is another structural schematic diagram of the upper cover assembly described in this utility model; Figure 5 This is a structural schematic diagram of the housing assembly described in this utility model; Figure 6 This is a schematic diagram of the structure of the battery cell module described in this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Top cover assembly; 11. Positioning post; 12. Positive electrode mounting hole; 13. Negative electrode mounting hole; 2. Housing assembly; 3. Battery cell module; 31. Carrier; 32. Battery cell; 33. Foam; 34. FPCB circuit board; 35. PC insulation board; 4. BMS circuit board; 5. Thermal conductive adhesive layer; 6. Sealing adhesive layer. Detailed Implementation

[0017] 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.

[0018] like Figure 1-2 As shown, this utility model provides a low-voltage lithium battery pack structure, including a top cover assembly 1, a housing assembly 2, and a cell module 3. The top cover assembly 1 contains an insert integrally formed therewith; the housing assembly 2 has a placement cavity inside; the cell module 3 is disposed in the placement cavity and is interference-fitted with the placement cavity; the top cover assembly 1 covers the opening end of the housing assembly 2 and is detachably connected to the housing assembly 2; the cell module 3 is connected to the top cover assembly 1 through part of the insert.

[0019] The low-voltage lithium battery pack structure provided by this utility model involves assembling the top cover assembly 1, the housing assembly 2, and the cell module 3 separately during assembly. Since the top cover assembly 1 is an injection-molded part containing inserts, the cell module 3 can be directly connected via these inserts. This results in a simple structure, low cost, and high strength, improving assembly efficiency, reducing labor intensity, and lowering production costs. The placement cavity between the cell module 3 and the housing assembly 2 is an interference fit, thus reducing the gap between the cell module 3 and the housing assembly 2, thereby reducing the overall size of the assembled pack structure and facilitating its application in other devices.

[0020] In one embodiment, the top cover assembly 1 is an integral injection-molded structure with embedded inserts, the inserts including positive and negative copper busbars, which are connected to the positive and negative terminals of the battery cell module 3 by bolts.

[0021] In one embodiment, such as Figure 3As shown, the insert also includes a positioning post 11, and the Pack structure also includes a BMS circuit board 4. The BMS circuit board 4 is installed in the upper cover assembly 1 through the positioning post 11, and the P+ end and P- end of the BMS circuit board 4 are respectively connected to the positive and negative copper busbars by bolts. The positive and negative terminals of the battery cell module 3 are respectively connected to the positive and negative terminals of the BMS circuit board 4.

[0022] In one embodiment, such as Figure 4 As shown, the insert also includes a positive mounting hole 12 and a negative mounting hole 13, which correspond to the positive and negative terminals of the battery cell module 3 and the BMS circuit board 4, respectively.

[0023] In one embodiment, the Pack structure further includes two small covers, which are respectively installed in the positive electrode mounting hole 12 and the negative electrode mounting hole 13, and can meet the IP67 level of dust and water resistance.

[0024] In one embodiment, such as Figure 2 As shown, the cavity wall surface of the placement cavity is covered with a thermally conductive adhesive layer 5, which wraps around the outside of the battery cell module 3. The battery cell module 3 is fixed to the housing assembly 2 through the thermally conductive adhesive layer 5.

[0025] In one embodiment, an adhesive groove is formed at the location where the thermally conductive adhesive layer 5 is laid in the placement cavity, and the adhesive groove is filled with sealant, such as... Figure 2 The sealant layer 6 is shown outside the thermally conductive adhesive layer 5.

[0026] In one embodiment, the height of the thermally conductive adhesive layer 5 is one-third of the height of the battery cell module 3.

[0027] In one embodiment, such as Figure 5 As shown, the housing assembly 2 is also an integrated injection-molded structure containing inserts.

[0028] In one embodiment, such as Figure 6 As shown, the battery module 3 includes a carrier 31, a battery cell 32, and foam 33. Multiple battery cells 32 are stacked, and multiple foams 33 are respectively disposed between each two adjacent battery cells 32. The carrier 31 is fixed to one end of the battery cell 32, and the carrier 31 is connected to the insert.

[0029] In one embodiment, the battery module 3 further includes an FPCB circuit board 34 and a PC insulation board 35, which are mounted on the carrier 31.

[0030] The assembly process of the low-voltage lithium battery pack structure provided by this utility model is as follows: The battery cells 32, foam 33, and carrier 31 are grouped together, and heating films and other materials can be placed between the battery cells 32. After the battery cells 32 are stacked, the carrier 31 is installed, and the battery cell tabs are rolled. Then, laser welding equipment is used to weld the battery cell tabs 32 to the carrier 31 and the FPCB circuit board 34. Finally, the PC insulating board 35 is attached to complete the prefabrication of the battery cell module 3. After that, the BMS circuit board 4 is slowly inserted along the positioning post 11 on the inside of the upper cover assembly 1, and the positive and negative copper busbars of the upper cover assembly 1 are connected to the P+ and P- copper busbars of the BMS circuit board 4 using M5 nuts to complete the prefabrication of the upper cover assembly 1. 1 / A thermally conductive adhesive layer 5 is formed by the A / B component thermally conductive structural adhesive of height 3. The battery cell module 3 is placed in the placement cavity. Then, using a glue applicator, epoxy resin sealant is injected into the glue tank of the housing assembly 2 to form a sealing layer 6. The top cover assembly 1 is then assembled to the housing assembly 2 along the positioning post 11. The top cover assembly 1 and the housing assembly 2 are connected using M4 bolts. After connection, the positive and negative copper busbars of the battery cell module 3 and the positive and negative copper busbars of the BMS circuit board 4 can be connected by bolts through the positive mounting hole 12 and negative mounting hole 13 reserved on the top cover. Finally, two small covers are installed at the positive mounting hole 12 and negative mounting hole 13 to complete the assembly of the entire package.

[0031] In addition, this utility model also provides a lithium battery pack, which has the low-voltage lithium battery pack structure provided by this utility model above.

[0032] 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 pack structure, characterized in that, include: A top cover assembly, wherein the top cover assembly contains an insert integrally formed therewith; A housing assembly, wherein the housing assembly has an internal storage cavity; A battery cell module is disposed in the placement cavity and is interference-fitted with the placement cavity. The upper cover assembly is disposed on the opening end of the housing assembly and is detachably connected to the housing assembly. The battery cell module is connected to the upper cover assembly through part of the insert.

2. The low-voltage lithium battery pack structure according to claim 1, characterized in that, The insert includes positive and negative copper busbars, which are connected to the positive and negative terminals of the battery cell module by bolts.

3. The low-voltage lithium battery pack structure according to claim 2, characterized in that, The insert also includes a positioning post, and the Pack structure also includes a BMS circuit board. The BMS circuit board is installed in the upper cover assembly through the positioning post, and the P+ and P- ends of the BMS circuit board are respectively connected to the positive and negative copper busbars by bolts. The positive and negative terminals of the battery cell module are respectively connected to the positive and negative terminals of the BMS circuit board.

4. The low-voltage lithium battery pack structure according to claim 3, characterized in that, The insert also includes a positive mounting hole and a negative mounting hole, which correspond to the positive and negative terminals of the battery cell module and the BMS circuit board, respectively.

5. The low-voltage lithium battery pack structure according to claim 4, characterized in that, The Pack structure also includes two small covers, which are respectively installed in the positive electrode mounting hole and the negative electrode mounting hole.

6. The low-voltage lithium battery pack structure according to claim 1, characterized in that, The cavity wall surface of the placement cavity is covered with a thermally conductive adhesive layer, which wraps around the outside of the battery cell module.

7. The low-voltage lithium battery pack structure according to claim 6, characterized in that, A groove is provided at the location where the thermally conductive adhesive layer is laid in the placement cavity, and the groove is filled with sealant.

8. The low-voltage lithium battery pack structure according to claim 1, characterized in that, The battery module includes a carrier, a battery cell, and foam. Multiple battery cells are stacked together, and multiple foams are disposed between each pair of adjacent battery cells. The carrier is fixed to one end of the battery cell and is connected to the insert.

9. The low-voltage lithium battery pack structure according to claim 8, characterized in that, The battery cell module also includes an FPCB circuit board and a PC insulation board, which are mounted on the carrier.

10. A lithium battery pack, characterized in that, The lithium battery pack has a low-voltage lithium battery pack structure as described in any one of claims 1-9.

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