Case of CTP battery pack, and CTP battery pack

Abstract

The present invention relates to a case of a CTP battery pack, and a CTP battery pack. The case of a CTP battery pack comprises a case body, and a plurality of mounting slots for accommodating battery cell modules therein are formed in the case body; the case of a CTP battery pack further comprises a plurality of transition plates which are respectively arranged in the plurality of mounting slots, the transition plates surround and clamp corresponding battery cell modules, and the transition plates are connected to the case of a CTP battery pack by means of mortise and tenon structures. In the case of a CTP battery pack of the present invention, the transition plates are arranged in the mounting slots, and the transition plates are connected to the case body by means of mortise and tenon structures so as to clamp the battery cell modules, eliminating the need for an adhesive layer used in existing CTP battery packs, thus eliminating an adhesive application process for the battery pack, reducing the complexity of manufacturing the battery pack, and eliminating many procedures in the battery pack production and manufacturing, thereby reducing the manufacturing cost of the CTP battery pack and significantly improving the production efficiency of the battery pack.

Description

A housing for a CTP battery pack and the CTP battery pack itself. Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a CTP battery pack housing and a CTP battery pack. Background Technology

[0002] Against the backdrop of fossil fuel scarcity and increasingly severe environmental pollution, the demand for new energy vehicles, especially electric vehicles, is gradually increasing. As the core component of new energy electric vehicles, the battery system plays a crucial role in safety and range performance. In traditional new energy electric vehicles, battery cell integration often involves integrating cells into battery modules using structural components, and then integrating these modules as subsystems into the overall housing. This integration method requires a large variety and number of parts, resulting in low integration density and low volumetric energy density of the battery pack. With continuous market demand, the energy density requirements for battery packs are increasing, and the cell-to-module-to-pack integration model is no longer sufficient to meet current energy requirements. CTP (Continuously To-Patient) battery pack technology eliminates the module layer in the battery pack. This technical solution can reduce the overall pack weight and number of parts to a certain extent, thereby improving the overall pack energy density.

[0003] The mainstream CTP battery packs on the market today have the structure shown in Figure 1. Their design features mainly involve stacking the cell modules 1' within the mounting groove formed inside the housing using adhesive layers 3', and connecting the housing frame 2' and the horizontal and vertical beams 6' using bolts 5' via forged parts 4'. Compared to the module design, this design can reduce the number of parts at the module level, thereby reducing the integration process of the battery pack to a certain extent, while also improving the energy density of the battery pack. However, this design also has some obvious drawbacks. Summarized from several aspects, the main disadvantages of this design are as follows: 1) This CTP battery pack design requires structural adhesive application during cell and enclosure integration, which increases equipment and production line workstations, thus increasing equipment investment and labor costs; 2) The cost of structural adhesive is relatively high, and the amount of adhesive applied inside the enclosure is very large, which also increases the cost of enclosure integration; 3) The enclosure structural components use forged parts 4' to connect the side beams of the frame 2' to the horizontal and vertical beams 6' with bolts 5', which increases the number of enclosure parts and makes material management more difficult; 4) The structure at the connection points of the enclosure is relatively weak, resulting in a weak overall strength of the battery pack. Summary of the Invention

[0004] Therefore, in order to address the shortcomings of the current CTP battery pack structure, this invention needs to provide a CTP battery pack housing and a CTP battery pack.

[0005] This invention proposes a housing for a CTP battery pack, which includes a housing body having a plurality of mounting slots for accommodating battery cell modules; the housing of the CTP battery pack also includes a plurality of transition plates, which are respectively disposed in the plurality of mounting slots, the transition plates surrounding and clamping the corresponding battery cell modules, and the transition plates are connected to the housing of the CTP battery pack by a mortise and tenon structure.

[0006] The present invention relates to a CTP battery pack whose casing has a transition plate set in the mounting groove. The cell module is clamped when the transition plate is mortised and tenoned with the casing body, replacing the adhesive layer in the existing CTP battery pack. This eliminates the need for applying structural adhesive to the battery pack, reduces the complexity of the battery pack manufacturing process, saves many steps in battery pack production, reduces the manufacturing cost of CTP battery packs, and greatly improves the production speed of battery packs.

[0007] As a further improvement of the above-mentioned solution of the present invention, the transition plate includes four plates connected end to end in sequence, and at least one plate has a pressure plate extending into the interior of the transition plate connected to its top.

[0008] As a further improvement to the above-mentioned solution of the present invention, pressure plates are connected to the top of two opposite plates of the transition plate, and the two pressure plates are arranged in parallel opposite directions.

[0009] As a further improvement to the above-described solution of the present invention, two clearance grooves are formed on the inner walls of the other two opposite plates of the transition plate.

[0010] As a further improvement of the above-mentioned solution of the present invention, the mortise and tenon structure includes a plurality of tenons formed on the outer surface of the transition plate and distributed circumferentially, and a plurality of tenons formed on the inner sidewall of the mounting groove and distributed circumferentially, wherein the plurality of tenons are respectively mortised into the plurality of tenons.

[0011] As a further improvement of the above-mentioned solution of the present invention, the box body includes a frame, longitudinal beams and transverse beams. The frame includes a left beam, a front beam, a right beam and a rear beam that are welded together end to end in sequence. The longitudinal beams and transverse beams are arranged in a cross shape within the frame to form a plurality of mounting grooves with the frame. The two ends of the longitudinal beams abut against the front beam and the rear beam respectively, and the two ends of the transverse beams abut against the left beam and the right beam respectively. Multiple tenons extending upward from their bottom surfaces are formed on the inner side walls of the left beam, the front beam, the right beam and the rear beam, as well as on the two side walls of the longitudinal beams and the transverse beams.

[0012] As a further improvement to the above-mentioned solution of the present invention, the height of the tenon groove is less than the height of the casing of the CTP battery pack.

[0013] As a further improvement to the above-mentioned solution of the present invention, the box body also includes a bottom guard plate, which is disposed below the frame. The bottom guard plate is connected to the left side beam, front side beam, right side beam, rear side beam, longitudinal beam and transverse beam by multiple bolts.

[0014] The present invention proposes a CTP battery pack, which includes the housing of the CTP battery pack as described above.

[0015] As a further improvement to the above-mentioned solution of the present invention, it also includes a plurality of battery cell modules, which are respectively disposed in a plurality of transition plates.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The CTP battery pack of the present invention uses a transition plate in the mounting groove to clamp the cell module when the transition plate is connected to the body of the pack body with a mortise and tenon joint. This replaces the adhesive layer in the existing CTP battery pack, eliminates the process of applying structural adhesive to the battery pack, reduces the complexity of the battery pack manufacturing process, saves many steps in the production of the battery pack, reduces the manufacturing cost of the CTP battery pack, and greatly improves the production speed of the battery pack.

[0018] 2. The CTP battery pack of the present invention has a casing that is connected to the frame, longitudinal beams, and transverse beams of the casing body by means of a transition plate and mortise and tenon structure. This can fix the longitudinal beams, transverse beams and frame, prevent the cell modules from falling off, and enable the frame to be connected and combined with the longitudinal beams and transverse beams by a single component, thereby improving the strength of the casing at the connection point and the overall strength of the battery pack. It can also facilitate the stacking of cells and apply a pre-tightening force to the cell modules after assembly, which can clamp the cell modules and prevent the cell modules from expanding.

[0019] 3. The transition plate of the present invention replaces the adhesive layer, forgings and other parts in the existing CTP battery pack, reducing the number and types of CTP battery pack parts, making management easier. At the same time, the reduction in the number and types of parts also greatly reduces the manufacturing cost of CTP battery packs. In addition, the reduction in the types of CTP battery pack parts and the elimination of the adhesive coating process also reduce the complexity of the battery pack manufacturing process, saving many steps in battery pack production and greatly improving the production speed of battery packs. Attached Figure Description

[0020] Figure 1 is an exploded view of an existing CTP battery pack;

[0021] Figure 2 is an exploded structural diagram of a CTP battery pack proposed in an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the frame structure in a CTP battery pack according to an embodiment of the present invention;

[0023] Figure 4 is a partial enlarged view of the frame of the box in a CTP battery pack according to an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the structure of the transition plate of the box in a CTP battery pack according to an embodiment of the present invention.

[0025] Reference numerals: 1. Mounting groove; 2. Battery cell module; 3. Transition plate; 4. Pressure plate; 5. Clearance groove; 6. Tenon; 7. Mortise and tenon; 8. Longitudinal beam; 9. Cross beam; 10. Left side beam; 11. Front beam; 12. Right side beam; 13. Rear beam; 14. Bottom guard plate; 15. Bolt. Detailed Implementation

[0026] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0027] 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 in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0028] Referring to Figure 2, this embodiment proposes a CTP battery pack, which includes a housing and four cell modules 2. The housing includes a housing body and four transition plates 3. The housing body includes a frame, longitudinal beams 8, transverse beams 9 and a bottom protective plate 14.

[0029] Referring to Figure 3, in this embodiment, the frame has a square frame structure, including a left beam 10, a front beam 11, a right beam 12, and a rear beam 13 that are welded together end to end. The longitudinal beams 8 and the transverse beams 9 are arranged in a cross shape inside the frame. The two ends of the longitudinal beams 8 are respectively abutted against the front beams 11 and the rear beams 13, and the two ends of the transverse beams 9 are respectively abutted against the left beams 10 and the right beams 12. The longitudinal beams 8, the transverse beams 9 and the frame form four square mounting grooves 1. Referring to Figure 4, in this embodiment, the left beam 10, front beam 11, right beam 12, and rear beam 13 have the same height. The longitudinal beam 8 and transverse beam 9 have the same height, and their heights are less than those of the left beam 10, front beam 11, right beam 12, and rear beam 13. Multiple tenons 7 are formed on the inner walls of the left beam 10, front beam 11, right beam 12, and rear beam 13, spaced apart along their length direction (e.g., the Y direction in Figure 3) and extending upwards from their bottom surfaces. Similarly, multiple tenons 7 are formed on the side walls of the longitudinal beam 8 and transverse beam 9, spaced apart along their length direction (the length direction of the transverse beam 9 is the Y direction in Figure 3, and the length direction of the longitudinal beam 8 is the X direction in Figure 3) and extending upwards from their bottom surfaces. Thus, multiple tenons 7 are formed on the inner walls of each mounting groove 1. In this embodiment, all tenons 7 have the same height, and their heights are less than those of the longitudinal beam 8 and transverse beam 9.

[0030] Four transition plates 3 are respectively installed in four mounting slots 1. Referring to Figure 5, in this embodiment, the transition plates 3 have a square ring structure. Each transition plate 3 includes four plates connected end to end in sequence. Multiple tenons 6 are arranged at intervals along the length direction on the outer side wall of each plate. The tenons 6 are adapted to the mortises 7. The multiple tenons 6 on the outside of the transition plate 3 are respectively mortised into the multiple mortises 7 on the inner side wall of the corresponding mounting slot 1. This allows the transition plate 3 to be connected to the frame of the box through the mortise and tenon structure formed by the multiple tenons 6 and the multiple mortises 7, which can prevent the transition plate 3 from falling off. The transition plate 3 is completely constrained in the X, Y, and Z directions (refer to Figure 2, where the X, Y, and Z directions are perpendicular to each other). During installation, the transition plate 3 is inserted into the mounting slot 1 from the bottom, and each tenon 6 is inserted into the mortise 7 from the bottom of the corresponding mortise 7. In this embodiment, in each transition plate 3, the top of two oppositely arranged plates is connected to a pressure plate 4 extending into the interior of the transition plate 3, and the two pressure plates 4 are arranged in parallel opposite directions; the inner sidewalls of the other two oppositely arranged plates are formed with two clearance grooves 5, and the two clearance grooves 5 on one plate are respectively corresponding to the two clearance grooves 5 on the other plate.

[0031] Four battery cell modules 2 are respectively installed within four transition plates 3. The battery cell modules 2 extend into the transition plates 3 from the bottom. Two pressure plates 4 on the transition plates 3 press down on the top of the corresponding battery cell modules 2. The pressure plates 4 provide directional restriction to the top of the battery cell modules 2 in the Z-direction to prevent the battery cell modules 2 from falling off. The structure of the clearance groove 5 on the transition plates 3 facilitates clearance of the clamps of the battery cell modules 2 during installation. Under the clamping force of the clamps, the battery cell modules 2 can be clamped. After the clamps release the battery cell modules 2, the battery cell modules 2 can be completely confined within the internal space of the transition plates 3 to prevent the battery cell modules from expanding.

[0032] The bottom protective plate 14 is located below the frame, and is connected to the left beam 10, front beam 11, right beam 12, rear beam 13, longitudinal beam 8, and transverse beam 9 by multiple bolts 15. After the bottom protective plate 14 is installed, it restricts the bottom of the cell module 2 and transition plate 3 in the Z direction, preventing the cell module 2 and transition plate 3 from falling off.

[0033] In this embodiment, during the assembly of the CTP battery pack, four transition plates 3 are first aligned with four mounting slots 1, and multiple tenons 6 on the transition plates 3 are aligned with multiple mortises 7 on the inner wall of the mounting slots 1. Then, pressure is applied to the transition plates 3 so that the multiple tenons 6 are engaged in the multiple mortises 7, thereby completely binding the transition plates 3 within the corresponding mounting slots 1. Then, the cell modules 2 are clamped using a clamp, with the clamp claws corresponding to the clearance slots 5 of the transition plates 3 and extending into the corresponding clearance slots 5, so that the clamp claws are disengaged from the cell modules 2, and the cell modules 2 are completely bound within the internal space of the transition plates 3. After the four cell modules 2 are installed, the bottom protective plate 14 is placed at the bottom of the frame, and the bottom protective plate 14 is connected to the left beam 10, the front beam 11, the right beam 12, the rear beam 13, the longitudinal beam 8, and the transverse beam 9 using bolts 15.

[0034] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0035] 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 in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] 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.

[0037] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A housing for a CTP battery pack, comprising a housing body having a plurality of mounting slots (1) for accommodating battery cell modules (2); characterized in that, The CTP battery pack housing also includes several transition plates (3), which are respectively set in several mounting slots (1). The transition plates (3) surround and clamp the corresponding cell modules (2), and the transition plates (3) are connected to the CTP battery pack housing by mortise and tenon structure.

2. The housing of the CTP battery pack according to claim 1, characterized in that, The transition plate (3) includes four plates connected end to end in sequence, and at least one plate has a pressure plate (4) extending into the interior of the transition plate (3) connected to its top.

3. The housing of the CTP battery pack according to claim 2, characterized in that, The top of two opposite plates of the transition plate (3) is connected to a pressure plate (4), and the two pressure plates (4) are arranged in parallel opposite directions.

4. The housing of the CTP battery pack according to claim 3, characterized in that, The other two opposing inner walls of the transition plate (3) each have two clearance grooves (5).

5. The housing of the CTP battery pack according to claim 1, characterized in that, The mortise and tenon structure includes multiple tenons (6) formed on the outer surface of the transition plate (3) and distributed circumferentially, and multiple mortises (7) formed on the inner sidewall of the mounting groove (1) and distributed circumferentially, with the multiple tenons (6) being mortised into the multiple mortises (7).

6. The housing of the CTP battery pack according to claim 5, characterized in that, The box body includes a frame, longitudinal beams (8) and transverse beams (9). The frame includes a left side beam (10), a front side beam (11), a right side beam (12) and a rear side beam (13) that are welded together end to end. The longitudinal beams (8) and transverse beams (9) are arranged in a cross shape inside the frame to form several mounting grooves (1). The two ends of the longitudinal beams (8) abut against the front side beams (11) and the rear side beams (13) respectively, and the two ends of the transverse beams (9) abut against the left side beams (10) and the right side beams (12) respectively. Multiple tenons (7) extending upward from their bottom surfaces are formed on the inner side walls of the left side beams (10), the front side beams (11), the right side beams (12) and the rear side beams (13), as well as on the two side walls of the longitudinal beams (8) and the transverse beams (9).

7. The housing of the CTP battery pack according to claim 6, characterized in that, The height of the tenon (7) is less than the height of the casing of the CTP battery pack.

8. The housing of the CTP battery pack according to claim 6, characterized in that, The box body also includes a bottom guard plate (14), which is located below the frame. The bottom guard plate (14) is connected to the left side beam (10), the front side beam (11), the right side beam (12), the rear side beam (13), the longitudinal beam (8), and the transverse beam (9) by multiple bolts (15).

9. A CTP battery pack, characterized in that, It includes the housing of the CTP battery pack as described in any one of claims 1-7.

10. The CTP battery pack according to claim 9, characterized in that, It also includes several battery cell modules (2), which are respectively set in several transition plates (3).

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