Pressing structure for CTP battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a compression structure for a CTP battery pack, which comprises a battery box, two opposite inner walls of the battery box are respectively provided with a side limiting plate, a middle pulling plate parallel to the side limiting plates is arranged in the middle of the interior of the battery box, and battery cells are distributed between the side limiting plates and the middle pulling plate. A plurality of middle pressing claws are arranged on the middle pulling plate and press the sides, close to the middle pulling plate, of the battery cells downwards, and a plurality of side pressing claws are arranged on the side limiting plate and press the sides, close to the side limiting plate, of the battery cells downwards. According to the pressing structure for the CTP battery pack disclosed by the utility model, the vertical downward constraint force on each battery cell is uniform, the relative displacement between the battery cells and the box body is ensured not to be generated all the time, and the abnormal battery cells are convenient to replace.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a compression structure for a CTP battery pack. Background Art

[0002] The new power system is evolving rapidly, and energy storage, as an indispensable element, is leading the power industry into a new era. In order to reduce costs, increase efficiency, and improve system safety, the iterative upgrade of energy storage systems is also advancing rapidly.

[0003] At present, the battery plug-in solutions of energy storage equipment integrators mainly include module structure and non-module structure (i.e. CTP (Cell to Pack)). Battery packs with integrated, low-cost, high energy density and other characteristics represented by CTP were first widely used in power battery systems. Now they are widely used in the design of energy storage battery plug-in boxes, which can reduce the floor space of energy storage systems and reduce the cost per kilowatt-hour.

[0004] Since the CTP design abandons traditional structural parts such as end plates, side plates or steel ties, the batteries in the battery compartment are subject to fewer constraints and their strength will be correspondingly weakened. In order to meet the requirements of reducing costs and achieving integration while taking into account structural safety, it is particularly important to effectively fix the batteries and evenly distribute the constraints to each battery cell.

[0005] In addition, in order to meet the vibration and drop requirements of the national standard, the current CTP solution ensures that there is no relative displacement between the battery and the box, does not affect the connection with the pole welding aluminum bar, applies thermal conductive structural glue between the bottom of the battery cell and the box, and fixes the battery cell and the large surface of the battery cell by applying structural glue or double-sided tape, and then uses a long pressure strip in the middle of each row of battery cell top cover to fix it. The use of structural glue in this solution increases the integration cost, and if there is an abnormality in the battery cell in the later stage, the single battery cell cannot be repaired or replaced, and the replacement of the entire plug-in box will bring extremely high after-sales costs. Using a long pressure strip to limit the vertical direction of the battery cell will not make it possible to balance the force on each battery cell. Summary of the invention

[0006] The purpose of the utility model is to address the deficiencies of the above-mentioned technology and provide a clamping structure for a CTP battery pack, so that each battery cell is evenly constrained vertically downward, ensuring that there is no relative displacement between the battery cell and the box body, and facilitating the replacement of abnormal battery cells.

[0007] To achieve the above object, the pressing structure for a CTP battery pack according to the present utility model includes a battery box. On two opposite inner walls of the battery box, there is a side limiting plate respectively. In the middle of the battery box, there is an intermediate pulling plate parallel to the side limiting plates. The battery cells are distributed between the side limiting plates and the intermediate pulling plate. On the intermediate pulling plate, there are intermediate pressing claws which press down one side of the battery cells close to the intermediate pulling plate to restrict the battery cells in the vertical direction. On the side limiting plates, there are several side pressing claws which press down one side of the battery cells close to the side limiting plates to restrict the battery cells in the vertical direction.

[0008] Preferably, at the top of the intermediate pulling plate, there are sheet-shaped pulling rings with the same number as the intermediate pressing claws. On the sheet-shaped pulling rings, there are intermediate pressing claw limiting holes. The intermediate pressing claws include a pressing claw connecting piece and four supporting claws arranged on the pressing claw connecting piece. The four supporting claws are symmetrically arranged with the pressing claw connecting piece as the center. The supporting claws press on the battery cells. On the lower surface of the pressing claw connecting piece, there is a groove for inserting the sheet-shaped pulling ring. In the middle of the pressing claw connecting piece, there is an intermediate pressing claw hook. When the sheet-shaped pulling ring is inserted into the groove, the intermediate pressing claw hook is stuck into the intermediate pressing claw limiting hole to limit the pressing claw connecting piece.

[0009] Preferably, the side pressing claws include a vertical side panel and supporting claws symmetrically arranged on both sides above the side panel. The supporting claws press on the battery cells. On the back of the side panel, there are at least two side pressing claw hooks through a reinforcing rib. At the top of the side limiting plate, there are side pressing claw limiting holes corresponding to the side pressing claw hooks.

[0010] Preferably, on the back of the side panel, there is a positioning pin through a reinforcing rib. At the top of the side limiting plate, there is a positioning hole corresponding to the positioning pin.

[0011] Preferably, the positioning pin is located in the middle of the side pressing claw hooks.

[0012] Preferably, the intermediate pulling plate is integrally welded to the battery box, and the side limiting plates are integrally welded to the battery box.

[0013] Preferably, the lower part of the side panel extends to form a spacer plate, which serves to electrically isolate the battery cells from the side limiting plates.

[0014] Preferably, one intermediate pressing claw presses one battery cell on each side of the intermediate pulling plate.

[0015] Preferably, one side pressing claw presses two adjacent battery cells.

[0016] Preferably, the contact surface between the supporting claws and the battery cells is a plane, which increases the contact surface and disperses the binding force to the top cover of the battery cells.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. The downward binding force on the battery cells is more uniform. Compared with the traditional long pressure strip used in CTP, there will be no situation where the middle battery cells have no binding force and the two end battery cells are pressed too tightly;

[0019] 2. The shoulders of the battery cells are tightly pressed. There is no pressure strip in the middle of the battery cell top cover, which does not affect the abnormal exhaust of the explosion-proof valve, does not interfere with other structural parts, does not affect the use of the current mainstream CCS (integrated busbar), and is safer;

[0020] 3. The middle pressure claw and the side pressure claw also play a role in electrically isolating the two side battery cells;

[0021] 4. Ensure that when the battery cells vibrate in the vertical direction, there is no relative displacement between the battery cells and the battery box, and the connecting aluminum busbars are not damaged;

[0022] 5. The support claws have elastic deformation, and the height difference between the battery cells can be adjusted. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the pressing structure for the CTP battery pack of the utility model;

[0024] Figure 2 is Figure 1 a schematic structural diagram of the middle pull plate in

[0025] Figure 3 is Figure 1 a schematic structural diagram of the middle pressure claw in

[0026] Figure 4 is Figure 1 a schematic structural diagram of the middle pressure claw from another perspective in

[0027] Figure 5 is Figure 1 a schematic structural diagram of the battery box and the side limit plate in

[0028] Figure 6 is Figure 1 a schematic structural diagram of the side pressure claw in

[0029] The reference numerals of each component in the figure are as follows:

[0030] Battery box 1, side limit plate 2, middle pull plate 3, battery cell 4, middle pressure claw 5, side pressure claw 6, sheet-shaped pull ring 7, middle pressure claw limit hole 8, pressure claw connecting piece 9, support claw 10, groove 11, middle pressure claw hook 12, side panel 13, reinforcing rib 14, side pressure claw hook 15, side pressure claw limit hole 16, positioning pin 17, positioning hole 18, spacer 19. Detailed Embodiment

[0031] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] As Figures 1 to 6 shown, a pressing structure for a CTP battery pack includes a battery box 1. Each of the two opposite inner walls of the battery box 1 is provided with a side limiting plate 2. A middle pulling plate 3 parallel to the side limiting plate 2 is provided in the middle of the battery box 1. The battery cells 4 are distributed between the side limiting plate 2 and the middle pulling plate 3. A middle pressing claw 5 is provided on the middle pulling plate 3, and the middle pressing claw 5 presses down the side of the battery cell 4 close to the middle pulling plate 3. A plurality of side pressing claws 6 are provided on the side limiting plate 2, and the side pressing claws 6 press down the side of the battery cell 4 close to the side limiting plate 2.

[0035] Among them, as Figure 1As shown in FIG. 4, at the top of the middle pull plate 3, there are sheet-shaped pull rings 7 with the same number as the middle press claws 5. On the sheet-shaped pull rings 7, there are middle press claw limit holes 8. The middle press claw 5 includes a press claw connecting piece 9 and four support claws 10 provided on the press claw connecting piece 9. The four support claws 10 are symmetrically arranged with the press claw connecting piece 9 as the center. The support claws 10 press on the battery cell 4. On the lower surface of the press claw connecting piece 9, there is a groove 11 for inserting the sheet-shaped pull ring 7. In the middle of the press claw connecting piece 9, there is a middle press claw hook 12. When the sheet-shaped pull ring 7 is inserted into the groove 11, the middle press claw hook 12 is snapped into the middle press claw limit hole 8 to limit the press claw connecting piece 9. The press claw connecting piece 9 can isolate the battery cells 4 on both sides, so as to avoid electrical insulation problems between the battery cells 4 on both sides.

[0036] As Figures 5 to 6 shown, the side press claw 6 includes a vertical side panel 13 and support claws 10 symmetrically arranged on both sides above the side panel 13. The support claws 10 press on the battery cell 4. On the back of the side panel 13, there are two side press claw hooks 15 provided through a reinforcing rib 14. At the top of the side limit plate 2, there are side press claw limit holes 16 corresponding to the side press claw hooks 15.

[0037] In addition, a spacer 19 is formed by extending the lower part of the side panel 13, which can isolate the battery cell 4 and the side limit plate 2, and avoid insulation problems caused by the contact between the battery cell 4 and the metal part.

[0038] At the same time, in this embodiment, on the back of the side panel 13, there is a positioning pin 17 provided through a reinforcing rib 14. At the top of the side limit plate 2, there is a positioning hole 18 corresponding to the positioning pin 17. The positioning pin 17 is located in the middle of the side press claw hooks 15.

[0039] In this embodiment, the middle pull plate 3 is a sheet metal structure and is integrally welded to the battery box 1, which can enhance the structural strength of the battery box 1. The side limit plate 2 is a sheet metal structure and is integrally welded to the battery box 1, which can enhance the structural strength of the battery box 1.

[0040] In this embodiment, one middle press claw 5 presses one battery cell 4 on each side of the middle pull plate 3, and one side press claw 6 presses two adjacent battery cells 4. In other embodiments, other distribution ratios can also be used.

[0041] In this embodiment, the contact surface between the support claw 10 and the battery cell 4 is a plane, which can increase the contact area with the top cover of the battery cell 1 as much as possible and disperse the binding force to the top cover.

[0042] In order to improve the strength, in this embodiment, a thickening and strengthening design is also made at the connection between the support claw and the press claw connecting piece 9, and a thickening and strengthening design is made at the connection between the support claw and the side panel 13.

[0043] In this embodiment, both the middle pressing claw 5 and the side pressing claw 6 are injection molded from high-elastic plastic. Compared with the traditional long pressing strip of CTP using high-strength steel, there is no need to consider the impact on electrical insulation performance.

[0044] When this embodiment is in use, press down the middle pressing claw 5 to insert the sheet-shaped pull ring 7 into the groove 11. Then, the middle pressing claw hook 12 is snapped into the middle pressing claw limiting hole 8 to limit the pressing claw connecting piece 9, forming a constrained space to fix the battery cell 4 inside and complete the pressing of the battery cell 4. At this time, the middle pressing claw hook 12 and the middle pressing claw limiting hole 8 are snapped together to form a detachable assembly. When disassembly is required, separate the middle pressing claw hook 12 from the middle pressing claw limiting hole 8, and then the middle pressing claw 5 can be removed, and further the battery cell 4 can be removed.

[0045] Similarly, press down the side pressing claw 6 to insert the side pressing claw hook 15 into the side pressing claw limiting hole 16. The side pressing claw hook 15 and the side pressing claw limiting hole 16 are snapped together to form a detachable assembly. When disassembly is required, separate the side pressing claw hook 15 from the side pressing claw limiting hole 16, and then the side pressing claw 6 can be removed, and further the battery cell 4 can be removed.

[0046] The pressing structure of the present utility model for the CTP battery pack has a more uniform downward binding force on the battery cell 4. Compared with the traditional long pressing strip of CTP, there will be no situation where the middle battery cell 4 has no binding force and the two-end battery cells 4 are pressed too tightly; the shoulders of the battery cell 4 are pressed, and there is no pressing strip in the middle of the battery cell 4 top cover, which does not affect the abnormal exhaust of the explosion-proof valve, does not interfere with other structural components, does not affect the use of the current mainstream CCS (integrated busbar), and is safer; the middle pressing claw 5 and the side pressing claw 6 also play a role in electrically isolating the two-side battery cells 4; it is ensured that when the battery cell 4 vibrates in the vertical direction, there is no relative displacement between the battery cell 4 and the battery box 1, and the connecting aluminum bar is not damaged; the supporting claw 10 elastically deforms to adjust the height difference between the battery cells 4.

[0047] Here, it should be noted that the description of the above technical solutions is exemplary. This specification can be embodied in different forms and should not be construed as limited to the technical solutions described herein. On the contrary, providing these descriptions will make the disclosure of the present utility model thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present utility model are only limited by the scope of the claims.

[0048] The shapes, sizes, ratios, angles, and numbers disclosed for various aspects of this specification and the claims are only examples. Therefore, this specification and the claims are not limited to the details shown. In the following description, when the detailed description of related known functions or configurations is determined to unnecessarily obscure the key points of this specification and the claims, the detailed description will be omitted.

[0049] When using the terms "comprising", "having", and "including" described in this specification, unless otherwise stated, it may also have another part or other parts, and the terms used may generally be singular but may also represent plural forms.

[0050] It should be noted that although the terms "first", "second", "top", "bottom", "one side", "the other side", "one end", "the other end", etc. may appear and be used in this specification to describe various different components, these components and parts should not be limited by these terms. These terms are only used to distinguish one component and part from another component and part. For example, without departing from the scope of this specification, the first component may be referred to as the second component, and similarly, the second component may be referred to as the first component. In certain cases, the components at the top and bottom can also be swapped or converted with each other; the components at one end and the other end may have the same or different properties from each other.

[0051] When describing the positional relationship, for example, when the positional order is described as "on...", "above...", "below...", and "next to...", unless words or terms such as "exactly" or "directly" are used, otherwise it may include the cases where there is no contact or contact between them. If it is mentioned that the first element is located "on" the second element, it does not mean that the first element must be located above the second element in the figure. The upper and lower parts of the said component will change according to the change of the observation angle and orientation. Therefore, in the drawings or in the actual structure, if the situation where the first element is located "on" the second element is involved, it may include the situation where the first element is located "below" the second element and the situation where the first element is located "above" the second element. When describing the time relationship, unless "exactly" or "directly" is used, when describing "after", "subsequent", "then", and "before", it may include the situation where the steps are not consecutive. The features of the various embodiments of the present invention can be partially or fully combined or spliced with each other, and can be implemented in various different structures as can be fully understood by those skilled in the art. The embodiments of the present invention can be implemented independently of each other, or can be implemented together in a mutually dependent relationship.

[0052] Finally, it should be noted that the above embodiments are only relatively representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and there can be many variations. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A pressing structure for a CTP battery pack, comprising a battery box (1), characterized in that: On each of two opposite inner walls of the battery box (1), there is provided a side limiting plate (2). In the middle of the interior of the battery box (1), there is provided an intermediate pull plate (3) parallel to the side limiting plate (2). The battery cells (4) are distributed between the side limiting plate (2) and the intermediate pull plate (3). On the intermediate pull plate (3), there are provided intermediate pressing claws (5). The intermediate pressing claws (5) press down one side of the battery cells (4) close to the intermediate pull plate (3). On the side limiting plate (2), there are provided a plurality of side pressing claws (6). The side pressing claws (6) press down one side of the battery cells (4) close to the side limiting plate (2). At the top of the intermediate pull plate (3), there are provided sheet-shaped pull rings (7) having the same number as the intermediate pressing claws (5). On the sheet-shaped pull rings (7), there are provided intermediate pressing claw limiting holes (8). The intermediate pressing claws (5) include claw connecting members (9) and four supporting claws (10) provided on the claw connecting members (9). The four supporting claws (10) are symmetrically arranged with the claw connecting member (9) as the center. The supporting claws (10) press on the battery cells (4). On the lower surface of the claw connecting member (9), there is provided a groove (11) for inserting the sheet-shaped pull ring (7). In the middle of the claw connecting member (9), there is provided an intermediate pressing claw hook (12). After the sheet-shaped pull ring (7) is inserted into the groove (11), the intermediate pressing claw hook (12) is engaged with the intermediate pressing claw limiting hole (8) to limit the claw connecting member (9). The side pressing claws (6) include vertical side panels (13) and supporting claws (10) symmetrically arranged on both sides above the side panels (13). The supporting claws (10) press on the battery cells (4). On the back surface of the side panel (13), there are provided at least two side pressing claw hooks (15) through a reinforcing rib (14). At the top of the side limiting plate (2), there are provided side pressing claw limiting holes (16) corresponding to the side pressing claw hooks (15).

2. The pressing structure for a CTP battery pack according to claim 1, wherein: On the back surface of the side panel (13), there is provided a positioning pin (17) through a reinforcing rib (14). At the top of the side limiting plate (2), there is provided a positioning hole (18) corresponding to the positioning pin (17).

3. The pressing structure for the CTP battery pack according to claim 2, wherein: The positioning pin (17) is located in the middle of the side pressing claw hooks (15).

4. The pressing structure for a CTP battery pack according to claim 1, wherein: The intermediate pull plate (3) is integrally welded to the battery box (1), and the side limiting plate (2) is integrally welded to the battery box (1).

5. The pressing structure for a CTP battery pack as described in claim 1, characterized in that: The lower part of the side panel (13) extends to form a spacer plate (19).

6. The pressing structure for a CTP battery pack according to claim 1, wherein: One intermediate pressing claw (5) presses one battery cell (4) on each side of the intermediate pull plate (3).

7. The pressing structure for the CTP battery pack according to claim 1, characterized in that: One side pressing claw (6) presses two adjacent battery cells (4).

8. The pressing structure for the CTP battery pack according to claim 1, characterized in that: The contact surface of the supporting claw (10) and the battery cell (4) is a plane.

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