A CTP battery module
By using plastic end plates and oblique busbars in the CTP battery module, combined with the bonding and fixing method of the heating film, the problems of large weight and low energy density of traditional CTP battery modules are solved, and higher energy density and space utilization are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 中汽新能(天津)电池科技有限公司
- Filing Date
- 2025-02-25
- Publication Date
- 2026-07-07
AI Technical Summary
Traditional CTP battery module structures contain many structural components, are heavy, have low energy density, and the diagonal output of the positive and negative electrodes of the cells is not conducive to space utilization.
The system employs plastic end plates for rigid constraint, designs a slanted busbar to change the cell polarity connection, uses a heating film for fixation with fire-retardant rubber pads, integrates multiple functional components, and optimizes the space utilization of the battery system.
It improves the energy density and space utilization of the battery module, achieves a high degree of integration of module structural components, and enhances the safety and insulation performance of the battery system.
Smart Images
Figure CN224472619U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery module structure technology, specifically to a CTP battery module. Background Technology
[0002] Currently, the main power source for new energy vehicles is the battery system. With the popularization and promotion of electric vehicles, various car manufacturers have put forward higher requirements for the energy density and high integration of battery systems.
[0003] CTP is a battery module structure. In traditional CTP battery module structures, the number of series and parallel battery modules increases, the modules become longer, and most of them use traditional end plate and side plate structures to constrain the cells. Then the modules are fixed to the housing mounting beams with bolts. This structure contains more structural components, is heavier, and has a lower energy density. Utility Model Content
[0004] In view of the technical problems of traditional CTP battery module structures, such as having many structural components, heavy weight, and low energy density, the purpose of this utility model is to provide a CTP battery module.
[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:
[0006] A CTP battery module includes a cell unit, a busbar, and an FPC, characterized in that it further includes two plastic end plates installed at both ends of the cell unit for rigidly constraining the cell unit.
[0007] Each of the plastic end plates includes a first and a second embedded nut for mounting and fixing the busbar and the FPC reinforcement plate, three circular through holes for mounting cable ties to fix the wire harness on the side not where the FPC reinforcement plate is installed, three rectangular slots between the slots on both sides of the upper end of the plastic end plate for hoisting and between the slots on both sides of the upper end, two cylindrical variable cross-section stepped slots on the upper end of the plastic end plate for limiting the battery module when it is placed into the box.
[0008] The cell unit is an odd-numbered string of cells stacked together, and the positive and negative terminals of the three cells at one end of the cell unit are reversed. The innermost cell of the three cells is diagonally connected to the adjacent innermost cell through a diagonal busbar to change the direction of the output busbar.
[0009] In this process, foam is attached between the large surfaces of any two adjacent cells.
[0010] The top of the busbar is affixed with a fireproof rubber pad, which covers the busbar and the FPC, and avoids the explosion-proof valve of the battery cell.
[0011] It also includes a heating film, which is pasted on both sides of the battery cell unit, and its heating output end and heating input end are connected to the fireproof rubber pad by pasting.
[0012] The heating film has multiple slots.
[0013] The plastic end plate is bonded to the end face buffer pad between itself and the battery cell unit.
[0014] The battery cell unit has a busbar support frame, a busbar, and an FPC mounted on its shoulder, and both the busbar and the FPC avoid the battery cell explosion-proof valve.
[0015] It also includes a module protective cover, which is snapped into place with a protruding buckle on the plastic end plate to protect the output busbar from being exposed.
[0016] Compared with the prior art, the beneficial effects of this utility model are:
[0017] The plastic end plate in this application integrates multiple functions. It can not only limit the position of the battery cell and suspend the battery module, but also meet the installation and limiting functions of multiple external connectors, thereby achieving a high degree of integration of module structural components and improving the energy density of the module.
[0018] In addition, when stacking cells, the positive and negative pole directions of some cells are changed, and the electrical connection is made by crossing the busbar at an angle, thereby changing the direction of the output busbar and improving the internal space utilization of the battery system.
[0019] In addition, the output and input ends of the heating film are attached to the fireproof rubber pad of the busbar for fixation, which is a simple structure. Attached Figure Description
[0020] Figure 1 The diagram shown is a schematic representation of the overall structure of the battery module provided in this embodiment of the application.
[0021] Figure 2 The diagram shown is an exploded view of the battery module provided in an embodiment of this application.
[0022] Figure 3 The diagram shown is a schematic diagram of the cell stacking structure provided in an embodiment of this application;
[0023] Figure 4 The diagram shown is a schematic diagram of the plastic end plate structure provided in an embodiment of this application;
[0024] Figure 5 The diagram shown is a schematic diagram of the module protective cover structure provided in an embodiment of this application;
[0025] Figure 6The diagram shown is a schematic diagram of the bus installation structure provided in an embodiment of this application;
[0026] Figure 7 The diagram shown is a schematic diagram of the inclined busbar structure provided in an embodiment of this application;
[0027] Figure 8 The diagram shown is a schematic diagram of the heating film structure provided in an embodiment of this application;
[0028] In the figure, 1 is a plastic end plate; 1-1 is a first embedded nut; 1-2 is a second embedded nut; 1-3 is a circular through hole; 1-4 is a slot; 1-5 is a rectangular slot; 1-6 is a cylindrical variable cross-section stepped slot; 1-7 is a buckle; 2 is an end face buffer pad; 3 is a battery cell; 4 is foam between battery cells; 5 is a busbar support frame; 6 is a busbar; 7 is an FPC; 8 is a fireproof rubber pad; 9 is a module protective cover; 10 is a heating film; 31 are three battery cells; 61 is a slanted busbar; 62 is an output busbar; 71 is an FPC reinforcing plate; 32 is a battery cell explosion-proof valve; 101 is a heating output end; 102 is a heating input end; 11-1 is a first bolt; 11-2 is a second bolt. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0031] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.
[0032] Please see Figures 1-8 The diagram shows the structure of an embodiment provided by this utility model. Example 1
[0033] This embodiment provides a CTP battery module, including a cell unit, a busbar 6, an FPC 7, and two plastic end plates 1 installed at both ends of the cell unit for rigidly constraining the cell unit.
[0034] Specifically, in a preferred embodiment, the plastic end plate 1 is provided with the following specific structure:
[0035] The plastic end plate 1 has multiple embedded nuts for installing and fixing the busbar 6 and the FPC reinforcing plate 71. Three circular through holes 1-3 are located on the side of the plastic end plate 1 not where the FPC reinforcing plate is installed, for installing cable ties to secure the wire harness. The upper end of the plastic end plate 1 has a slot 1-4 on each side and three rectangular slots 1-5 in the middle of both sides for hoisting, used to install the clamps of the module hoisting fixture, which compress the module along its length. The plastic end plate 1 also has two cylindrical variable cross-section stepped slots 1-6, used to limit the module's position when it enters the box. During hoisting, the cylindrical variable cross-section stepped slots 1-6 match the pins on the box mounting beam to limit the module's position within the box. While there are two cylindrical variable cross-section stepped slots 1-6 on the plastic end plate, only one is used in practice. The design described above is to ensure that the plastic end plate can accommodate multiple modules in different positions.
[0036] The plastic end plate provided in this embodiment integrates multiple functions. It can not only limit the position of the battery cell and suspend the module, but also meet the installation and limiting functions of multiple external connectors, realizing the integration of module structural components. Example 2
[0037] Traditionally, busbars are connected in series and parallel within the module. For odd-numbered series modules like 1P19S, the traditional output busbars output diagonally. This output can sometimes hinder high-voltage connections between modules and reduce the internal space utilization of the battery system. This application provides the following embodiment structure:
[0038] By changing the positive and negative terminals of the three cells 31 at one end of the battery cell unit, a diagonal busbar 61 is designed to connect two adjacent cells 3 diagonally as shown in the figure, thereby changing the direction of the output busbar 62 and improving the internal space utilization of the battery system. At the same time, the diagonal busbar 61 also meets the requirements of avoiding the cell explosion-proof valve. Example 3
[0039] Traditional CTP battery systems with heating functions are fixed by snapping the heating film at the wire outlet, which affects the space utilization of the battery system.
[0040] In this embodiment, a fireproof rubber pad 8 is attached to the top of the busbar 6, covering the busbar and FPC, and avoiding the cell explosion-proof valve 32. This protects the busbar and FPC from effective insulation from the box cover at high temperatures, preventing heat conduction to the box cover. Avoiding the cell explosion-proof valve can prevent heat from spreading to adjacent cells in the event of thermal runaway of a single cell, thus preventing thermal runaway of the battery system.
[0041] The heating film 10 is adhered to both sides of the module, and the heating output end 101 and the heating input end 102 are fixed to the fireproof rubber pad 8 by adhesive. The heating film 10 has multiple slots; during the cell expansion process, the slots can be stretched or even torn open to ensure that the heating resistance wire can be stably adhered to the cell and prevent the heating film from burning out. This embodiment modifies the heating film wire fixing method, improving the space utilization of the battery system.
[0042] It should be noted that the assembly method of the battery module provided in this application is as follows:
[0043] In this embodiment, the battery module has a series-parallel number of 1P19S cells, with an odd number of cells in the series. The number of cells can be increased or decreased according to the requirements of the battery system, but the overall design remains unchanged when the number of cells in the series is odd.
[0044] To assemble this CTP battery module, firstly, the modules are stacked along their length. The plastic end plate 1, end face buffer pad 2, battery cells 3, and inter-cell foam 4 are stacked sequentially. The end face buffer pad 2 is attached between the plastic end plate 1 and the battery cell 3. Along the thickness direction of the battery cells, the cells are arranged in a single row, with inter-cell foam 4 attached between the large surfaces of two cells. When stacking the four battery cells 31 on the left, it is important to ensure that the positive and negative terminals are reversed sequentially to avoid short circuits when installing the busbar.
[0045] The battery module uses a plastic end plate 1 to rigidly constrain the battery cell 3. The end plate is made of plastic to ensure the insulation performance between the casing and the battery cell. The plastic end plate 1 has multiple embedded nuts for installing and fixing the busbar and the FPC reinforcing plate 71.
[0046] After stacking, busbar support frame 5, busbar 6, and FPC7 are installed on the shoulder of cell 3. Busbar 6 and FPC7 both avoid the cell explosion-proof valve 32. By reversing the positive and negative terminals of the three cells 31 on the left, a diagonal busbar 61 is designed to connect two adjacent cells diagonally. Then, busbars 6 are connected in series and parallel, thereby changing the direction of the output busbar 62. At the same time, the openings of the output busbars 62 on both sides must be aligned with the holes of the first embedded nut 1-1 on the plastic end plate. Then, the busbars are welded to the cell terminals by laser welding to complete the electrical connection of the cells.
[0047] The FPC (Flexible Printed Circuit Board) reinforcing plate 71 is bolted to the second embedded nut 1-2 of the plastic end plate by bolts 11-1. The nickel sheet on the FPC is welded to the busbar to realize the voltage and temperature sampling of each cell.
[0048] The top of the busbar is covered with fireproof rubber pad 8. The fireproof rubber pad 8 avoids the explosion-proof valve 32 of the battery cell, and at the same time can provide insulation protection for the busbar 6 and block the high temperature conduction of the busbar, thus playing a role in fireproofing, heat insulation and insulation.
[0049] There are two strings of heating film 10, which are respectively glued to the two sides of the module to provide the function of heating the battery cell. The heating film has no mounting point on the plastic end plate 1. The heating output end 101 and the heating input end 102 need to be folded upward and glued to the fireproof rubber pad 8 to achieve fixation.
[0050] Finally, when connecting the modules, the output busbar is fixed to the plastic end plate using the second bolt 11-2, and the module protective cover 9 is snapped into place with the protruding clips 1-7 on the plastic end plate 1. The module protective cover 9 protects the output busbar 62 from exposure and provides insulation protection.
[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A CTP battery module, comprising a cell unit, a busbar (6), and an FPC (7), characterized in that, It also includes two plastic end plates (1) installed at both ends of the battery cell unit for rigidly constraining the battery cell unit.
2. The CTP battery module according to claim 1, characterized in that, Each of the plastic end plates (1) includes a first embedded nut (1-1) and a second embedded nut (1-2) for mounting and fixing the busbar (6) and the FPC reinforcing plate (71), three circular through holes (1-3) for mounting cable ties to fix the wire harness on the side not where the FPC reinforcing plate (71) is installed, slots (1-4) for hoisting and set on both sides of the upper end of the plastic end plate (1) and three rectangular slots (1-5) between the two sides of the upper end, and two cylindrical variable cross-section stepped slots (1-6) set on the upper end of the plastic end plate (1) for limiting the battery module when the battery module is put into the box.
3. A CTP battery module according to claim 1, characterized in that, The cell unit is an odd-numbered string of cells (3) stacked together, and the positive and negative poles of the three cells (31) at one end of the cell unit are reversed. The inner cell (31) and its adjacent inner cell are connected diagonally across the busbar (61) to change the direction of the output busbar (62).
4. A CTP battery module according to claim 3, characterized in that, Foam between any two adjacent cells is attached (4).
5. A CTP battery module according to claim 1, characterized in that, A fireproof rubber pad (8) is attached to the top of the busbar (6) to cover the busbar (6) and the FPC (7) and to avoid the cell explosion-proof valve (32).
6. A CTP battery module according to claim 5, characterized in that, It also includes a heating film (10), which is pasted on both sides of the battery cell unit. Its heating output end (101) and heating input end (102) are connected to the fireproof rubber pad (8) by pasting.
7. A CTP battery module according to claim 6, characterized in that, The heating film (10) has multiple slots.
8. A CTP battery module according to claim 1, characterized in that, The plastic end plate (1) is bonded to the end face buffer pad (2) between the cell unit and the end face buffer pad (2).
9. A CTP battery module according to claim 1, characterized in that, The battery cell unit is equipped with a busbar support frame (5), a busbar (6) and an FPC (7) on its shoulder, and both the busbar (6) and the FPC (7) avoid the battery cell explosion-proof valve (32).
10. A CTP battery module according to claim 1, characterized in that, It also includes a module protective cover (9), which is snapped into place with the protruding buckles (1-7) on the plastic end plate (1) to protect the output busbar (62) from being exposed.