Battery cell module assembly structure and CTP battery pack
By incorporating heating elements into the adhesive of the CTP battery pack, the destructive nature of cell module disassembly is resolved, enabling non-destructive disassembly and reducing battery pack maintenance costs.
Patent Information
- Application Number
- CN202520437045.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-13
AI Technical Summary
The existing CTP battery pack cell modules can only be disassembled through destructive methods when they need to be removed, resulting in high replacement costs.
A heating element is placed in the adhesive to heat the adhesive to the peeling temperature, thus enabling non-destructive disassembly of the battery cell module.
This enables non-destructive disassembly of battery cell modules, reducing cell damage, lowering maintenance costs, and improving economic efficiency.
Smart Images
Figure CN223956654U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to CTP battery pack technical field, concretely relates to a kind of battery cell module assembly structure and CTP battery pack. BACKGROUND
[0002] Current power battery integration is higher and higher, volume utilization rate is constantly innovated high, traditional end plate module form is gradually replaced by CTP scheme, and the fixing mode of battery cell is changed from bolt connection between end plate and box to direct adhesive connection at the bottom of battery cell.
[0003] Although the above-mentioned battery cell fixing mode greatly improves the pack assembly rate, due to the strong adhesion of structural adhesive, when the battery cell module needs to be disassembled, destructive disassembly is the only way, which leads to the replacement of the entire battery pack when any battery cell in the battery pack fails, resulting in high replacement cost. UTILITY MODEL CONTENTS
[0004] To solve the problem that the battery cell module of the CTP battery pack in the prior art can only be disassembled destructively, the purpose of the utility model is to provide a battery cell module assembly structure and a CTP battery pack.
[0005] The technical scheme provided by the utility model is as follows:
[0006] In a first aspect, a battery cell module assembly structure includes a battery cell module and a substrate. The battery cell module is bonded to the substrate by an adhesive. A heating element is disposed within the adhesive. The heating element has a flow channel. The adhesive on the side of the heating element close to the battery cell module is in communication with the adhesive on the side of the heating element close to the substrate through the flow channel.
[0007] By arranging the heating element in the adhesive layer, the adhesive strength of the adhesive layer is not reduced. By heating the adhesive with the heating element, the adhesive reaches the peeling temperature, and the battery cell module can be removed, which can minimize damage to the battery cell module, reduce the maintenance cost of the battery pack, and improve economic efficiency.
[0008] As an optional technical scheme of the first aspect, the heating element is provided with a plurality of through holes, and the through holes form the flow channel.
[0009] In this scheme, through holes are provided on the heating element, and the flow channel is formed by the through holes, which can reduce the number of heating elements, facilitate assembly and production, and improve assembly efficiency.
[0010] As an optional technical scheme of the first aspect, the heating element has a plurality of heating elements, and the plurality of heating elements are arranged at intervals, and the gap between adjacent heating elements forms the flow channel.
[0011] Multiple heating elements are provided, which facilitates flexible arrangement of each heating element according to product structure.
[0012] Optionally, the end face of the substrate close to the end face of the battery cell module is denoted as end face K; a plane parallel to the end face K is taken as a projection plane; the projection of the flow channel on the projection plane is denoted as a; the projection of the end face K on the projection plane is denoted as b; the area of the projection a and the area of the projection b satisfy: a / b = 20%~90%.
[0013] In this scheme, the area of the flow channel should not be too small, and the flowability of the adhesive before curing is utilized, so that the adhesive can fill the adhesive application space through the flow channel, thereby improving the bonding strength of the battery cell module. The area ratio of the flow channel should not be too large, so as to avoid slow heating speed of the adhesive due to small heating area of the heating element.
[0014] Optionally, the heating element comprises an electric heating core, and the electric heating core is covered by the packaging film; and the through hole is arranged on the packaging film.
[0015] As an optional technical solution of the first aspect, a limiting piece is further included, which is used to limit the position of the heating element in the adhesive, so that the adhesive application space is formed between the heating element and the battery cell module and between the heating element and the substrate.
[0016] In this embodiment, the limiting piece is arranged to avoid direct contact between the heating element and the battery cell and the substrate, reduce heat loss of the heating element during disassembly, and also prevent the battery cell from being excessively heated and causing thermal runaway of the battery cell.
[0017] Specifically, the limiting piece comprises an upper limiting strip and a lower limiting strip; the lower limiting strip is arranged between the heating element and the substrate; and the upper limiting strip is arranged between the heating element and the battery cell module.
[0018] Under the limiting action of the upper limiting strip and the lower limiting strip, the heating element will not sink to contact the substrate, nor will it float to contact the battery cell module.
[0019] Specifically, the lower limiting strip is bonded with the heating element and the substrate, respectively; and the upper limiting strip is bonded with the heating element. By using glue bonding, the assembly parts can be reduced, and the battery pack assembly rate can be improved.
[0020] The second aspect is a CTP battery pack, which comprises a box body and the battery cell module assembly structure of the first aspect or any one of the technical solutions of the first aspect; and the battery cell module assembly structure is installed in the box body.
[0021] Optionally, the substrate is a liquid cooling plate. The heating element is not only used when disassembling the battery module, but also can cooperate with the liquid cooling plate to quickly heat the battery cell in low-temperature charging and driving conditions, so that the battery cell operates at a reasonable temperature and the service life of the battery cell is improved.
[0022] Compared with the prior art, the technical scheme has the beneficial effects that:
[0023] The heating element heats the adhesive to the peeling temperature, so that the battery cell module can be taken out. Compared with the traditional mechanical forced disassembly method, the scheme will not damage the battery cell, and the module can be taken out completely. Compared with using a liquid cooling plate to heat the adhesive to the peeling temperature, the heating element arranged in the adhesive can heat all the adhesive to the peeling temperature more quickly. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 It is an exploded view of the CTP battery pack in an embodiment of the application;
[0025] Figure 2 It is a schematic view of the CTP battery pack when the battery cell module is removed in an embodiment of the application;
[0026] Figure 3 It is a schematic view of the heating element when the surface encapsulation film is removed in an embodiment of the application;
[0027] Figure 4 It is a schematic view of the upper limiting strip arranged on the heating element in an embodiment of the application;
[0028] Figure 5 It is a sectional view of the battery cell module assembly structure in an embodiment of the application;
[0029] Figure 6 It is a schematic view of the glue applying space provided in the battery cell module assembly structure in an embodiment of the application;
[0030] Figure 7 It is a disassembly flowchart of the battery cell module in an embodiment of the application.
[0031] Explanation of reference numerals in the schematic view:
[0032] Battery cell module 101, base plate 102, box body 103, upper limiting strip 104-1, lower limiting strip 104-2, adhesive 105;
[0033] Heating element 200, encapsulation film 201, through hole 202, electric heating core 203, wire harness terminal 204. DETAILED DESCRIPTION
[0034] In order to further understand the content of the utility model, the utility model is described in detail in combination with the drawings and embodiments.
[0035] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.
[0036] In one embodiment, such as Figure 1 , 5 As shown in Figure 6, this application proposes a cell module assembly structure, including a cell module 101, a substrate 102, and a heating element 200. The substrate 102 can be a liquid cooling plate. It should be noted that the substrate 102 is not limited to a liquid cooling plate; other materials that can be connected to the cell module 101 of an existing CTP battery pack are also applicable to this application, and will not be elaborated further here. The liquid cooling plate has cooling fluid channels inside, which cool the cell module 101 through the liquid medium. Existing technologies also include heating devices to raise the temperature of the cell module 101 by heating the liquid medium, maintaining its operating temperature within an ideal range. This is relatively mature in existing technologies and will not be elaborated further here.
[0037] The battery cell module 101 and the substrate 102 are arranged at intervals. The interval arrangement here means that the lower end surface of the battery cell module 101 and the upper end surface of the substrate 102 are not in direct contact. An adhesive space is formed between them. The battery cell module 101 and the substrate 102 are fixed by injecting adhesive 105.
[0038] In this embodiment, the heating element 200 is disposed inside the adhesive 105, and the heating element 200 has a flow channel. The adhesive 105 separated by the heating element 200 can be kept flowing through the flow channel. During adhesive injection, the adhesive flows through the flow channel, thereby filling the injection space. In addition, the flow channel allows the adhesive 105 to remain as a whole, preventing it from being delaminated by the heating element 200, thereby ensuring the structural strength of the battery pack.
[0039] When the battery cell module 101 is assembled, the battery terminals face upwards and the substrate 102 is located below the battery cell module 101. At this time, the heating element 200 is disposed between the battery cell module 101 and the substrate 102. The adhesive 105 on the side of the heating element 200 near the battery cell module 101 (i.e., the upper side of the heating element) and the adhesive 105 on the side of the heating element 200 near the substrate 102 (i.e., the lower side of the heating element) are connected through a flow channel.
[0040] It should be noted that the adhesive 105 can be a structural adhesive, a thermally conductive structural adhesive, or other adhesives commonly used in existing CTP battery packs. Such adhesives need to meet the requirement that their adhesive strength decreases after the temperature rises, so that the cell module 101 can be separated from the substrate 102.
[0041] For the arrangement of the heating element in the adhesive 105, please refer to the following two implementation schemes:
[0042] (1) such as Figures 2-4 As shown, the heating element 200 has multiple through holes 202, which form a flow channel. In this case, only one sheet-shaped heating element 200 is often needed to meet the requirements, thus reducing the number of heating elements, facilitating assembly and production, and improving assembly efficiency.
[0043] (2) There are multiple heating elements 200 (not shown in the figure). The multiple heating elements 200 are arranged at intervals. At this time, there are gaps between adjacent heating elements 200, and a flow channel can be formed through these gaps. When the lower end of the battery cell module 101 has a protrusion, this arrangement can also arrange heating elements in the adhesive 105 corresponding to the protrusion.
[0044] When the flow channel area is small, the adhesive flow on both sides of the heating element 200 is poor, and the separation of the adhesive layer by the heating element will be aggravated, which will reduce the structural strength of the battery pack. When the flow channel area is large, it means that the heating area of the heating element is reduced, which is not conducive to heating the adhesive and raising its temperature.
[0045] Therefore, as an optional implementation, the end face of the substrate 102 closest to the cell module 101 is denoted as end face K. A plane parallel to end face K is taken as the projection plane, the projection of the flow channel onto the projection plane is denoted as a, and the projection of end face K onto the projection plane is denoted as b. The area of projection a and the area of projection b satisfy: a / b = 20%~90%.
[0046] In this implementation scheme, the area of the flow channel is appropriate, which allows the adhesive to fill the application space by utilizing its fluidity before curing, while also ensuring the bonding strength of the battery cell module. It also avoids the adhesive heating rate being too slow due to an insufficient heating area of the heating element.
[0047] For the structure of the heating element, in an embodiment, as shown in Figure 3 the heating element 200 includes a packaging film 201, and an electric heating core 203 is arranged inside the packaging film 201. The electric heating core 203 can be a whole piece, which is arranged in the packaging film 201 through bending. The electric heating core 203 can also be multiple pieces, which are arranged in the packaging film 201 in series (not shown in the figure). The wire harness terminal 204 of the electric heating core 203 extends outside the electric core module 101, and when it is necessary to remove a certain electric core module 101, the wire harness terminal 204 of the corresponding heating element is connected to electricity.
[0048] The packaging film 201 can use a PI film, and other heat-resistant films in the prior art are also suitable for the present application.
[0049] The through hole 202 is arranged on the packaging film 201, and attention is paid to avoiding the through hole 202 from the electric heating core 203 during processing.
[0050] In an embodiment, other schemes are the same as the above-mentioned embodiment, and the difference lies in, as shown in Figures 1-6 a limiting piece is further included. By arranging the limiting piece, the position of the heating element 200 in the adhesive 105 can be fixed, so that the adhesive space is formed between the heating element 200 and the electric core module 101 and between the heating element 200 and the substrate 102. The limiting piece can also avoid the direct contact between the heating element 200 and the electric core and the substrate, reduce the heat loss of the heating element during disassembly, and also prevent the electric core from being excessively heated and causing thermal runaway of the electric core.
[0051] Specifically, the limiting piece includes an upper limiting strip 104-1 and a lower limiting strip 104-2. The lower limiting strip 104-2 is arranged between the heating element 200 and the substrate 102, and the lower limiting strip 104-2 supports the heating element 200 from the lower side to avoid the sinking of the heating element 200 and the contact with the substrate. The upper limiting strip 104-1 is arranged between the heating element 200 and the electric core module 101 to avoid the floating of the heating element 200 and the contact with the electric core.
[0052] For the connection mode of the limiting strip, preferably, the lower limiting strip 104-2 is bonded with the heating element 200 and the substrate 102 respectively. The upper limiting strip 104-1 is bonded with the heating element 200. Since the upper limiting strip 104-1 is not connected with the electric core, it is easier to remove the electric core.
[0053] In an embodiment, the present application also proposes a CTP battery pack, which includes a box body 103 and the electric core module assembly structure in any one of the above-mentioned embodiments, and the electric core module assembly structure is installed in the box body 103. This is relatively mature in the prior art, and will not be described here.
[0054] Preferably, the substrate 102 is a liquid cooling plate. The liquid cooling plate is connected to the box in various ways, such as FDS nail connection, bolt connection, welding, etc., which will not be described and limited here.
[0055] When it is necessary to disassemble the battery pack and replace the cell module, as shown in Figure 7 , first remove the box cover, module, electrical accessories and other parts, then power on the heating element 200 corresponding to the cell module to be removed. After the heating element 200 is powered on, the adhesive temperature rises. When the adhesive temperature rises to the falling temperature, use a suction cup disassembly tool to suck the cell module to be removed, then lift the cell module, thereby disassembling the cell module to be removed.
[0056] The above describes the utility model and its embodiments in a schematic manner, which is not restrictive. The embodiments shown in the drawings are only one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this, without departing from the creative purpose of the utility model, similar structural modes and embodiments can be designed without creativity, which should belong to the protection scope of the utility model.
Claims
1. An electric cell module assembly structure, characterized in that: comprising an electric cell module (101) and a substrate (102); wherein the electric cell module (101) and the substrate (102) are bonded by an adhesive (105); the adhesive (105) is provided with a heating element (200); the heating element (200) has a flow channel, and the adhesive (105) on the side of the heating element (200) close to the electric cell module (101) and the adhesive (105) on the side of the heating element (200) close to the substrate (102) are communicated through the flow channel.
2. The electric cell module assembly structure according to claim 1, characterized in that: the heating element (200) is provided with a plurality of through holes (202), and the through holes (202) form the flow channel.
3. The electric cell module assembly structure according to claim 1, characterized in that: the heating element (200) has a plurality of, and the plurality of heating elements (200) are arranged at intervals, and the gap between adjacent heating elements (200) forms the flow channel.
4. The electric cell module assembly structure according to claim 2 or 3, characterized in that: the end face of the substrate (102) close to the electric cell module (101) is denoted as end face K; a plane parallel to the end face K is taken as a projection plane; the projection of the flow channel on the projection plane is denoted as a; the projection of the end face K on the projection plane is denoted as b; and the area of the projection a and the area of the projection b satisfy: a / b=20%~90%.
5. The electric cell module assembly structure according to claim 2, characterized in that: the heating element (200) comprises an electric heating core (203), and the electric heating core (203) is covered by an encapsulation film (201); and the through holes (202) are arranged on the encapsulation film (201).
6. The electric cell module assembly structure according to claim 1, characterized in that: further comprising a limiting piece for limiting the position of the heating element (200) in the adhesive (105), so that the adhesive space is formed between the heating element (200) and the electric cell module (101) and between the heating element (200) and the substrate (102).
7. The electric cell module assembly structure according to claim 6, characterized in that: the limiting piece comprises an upper limiting strip (104-1) and a lower limiting strip (104-2); wherein, the lower limiting strip (104-2) is arranged between the heating element (200) and the substrate (102); and the upper limiting strip (104-1) is arranged between the heating element (200) and the electric cell module (101).
8. The electric cell module assembly structure according to claim 7, characterized in that: the lower limiting strip (104-2) is bonded with the heating element (200) and the substrate (102) respectively.
9. The electric cell module assembly structure according to claim 7, characterized in that: the upper limiting strip (104-1) is bonded with the heating element (200).
10. The CTP battery pack according to claim 9, characterized in that: further comprising the electric cell module assembly structure according to any one of claims 1-9; and the electric cell module assembly structure is installed in a box (103).
11. The CTP battery pack according to claim 10, characterized in that: 10. A CTP battery pack comprising a box (103), characterized in that: The substrate (102) is a liquid-cooled plate.