CTP battery pack and electric vehicle

Abstract

The utility model provides a CTP battery pack and an electric car, which belong to the technical field of batteries, and comprise a beam structure, an end plate and a battery cell which are connected in sequence, the end plate comprises a first side surface and a second side surface, the first side surface is connected with the battery cell, and the second side surface is connected with the beam structure; the second side face comprises a first surface and a second surface, the first surface makes contact with the beam structure, and a gap exists between the second surface and the beam structure. The battery pack comprises a beam structure, an end plate and a battery cell which are connected in sequence, the first side surface comprises a first surface and a second surface, the first surface is in contact with the beam structure, a gap is formed between the second surface and the beam structure, and glue at the bottoms of the battery cells can be extruded to overflow into the gap when the battery cells are grouped into the box body, namely, the glue at the bottom of the box body is adhered, and overflow glue is formed between the outer side of the end plate and the beam body; and an adhesive surface is increased, so that the sticking firmness is improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and specifically relates to a CTP battery pack and an electric vehicle. Background Technology

[0002] Cell-to-pack (CTP) is an advanced battery pack design whose core advantages lie in simplifying the assembly process, increasing energy density, reducing production costs, and enhancing battery reliability. The design philosophy and technological advantages of CTP make it a promising candidate for use in electric vehicles, smartphones, and other mobile devices. With continuous technological advancements and cost reductions, CTP is expected to play an increasingly important role in the future of battery technology.

[0003] However, CTP battery packs currently on the market have the following three common problems: ① After the cells are assembled and placed in the pack, they are generally only glued to the pack body at the bottom, without any other way to fix or limit the cells. Therefore, when CTP battery packs are subjected to vibration, impact, or other conditions, the cells are prone to delamination. ② The end plates of the assembled cells are directly attached to the beam, making it impossible to increase the adhesive surface area through glue overflow. ③ Even if glue overflow is possible, the lack of a properly designed glue-blocking strip leads to uneven glue overflow and weakened adhesion. Utility Model Content

[0004] To address the aforementioned issues, this utility model proposes a CTP battery pack, comprising a beam structure, an end plate, and battery cells connected in sequence.

[0005] The end plate includes a first side and a second side. The first side is connected to the battery cell, and the second side is connected to the beam structure. The second side includes a first surface and a second surface. The first surface is in contact with the beam structure, and there is a gap between the second surface and the beam structure.

[0006] Furthermore, the distance from the first surface to the first side surface is greater than the distance from the second surface to the first side surface.

[0007] Furthermore, the beam structure includes a beam body and a boss structure. The surface of the beam body is provided with the boss structure, which cooperates with the groove on the second side. The groove is located between the first surface and the second surface.

[0008] Furthermore, the beam and the boss structure are integrally formed.

[0009] Furthermore, the beam and the boss structure are fixedly connected.

[0010] Furthermore, a chamfer is provided at the connection between the second surface of the end plate and the lower surface of the end plate.

[0011] Furthermore, the first side is completely in contact with the battery cell.

[0012] Furthermore, the CTP battery pack also includes a housing, in which the beam structure, end plates, and battery cells are all installed, and the beam structure is fixedly connected to the inner surface of the housing.

[0013] Furthermore, there is a gap between the end plate and the battery cell and the bottom surface of the housing.

[0014] An electric vehicle includes a vehicle body and the aforementioned CTP battery pack, wherein the CTP battery pack is installed in the vehicle body.

[0015] The beneficial effects of this utility model are:

[0016] 1. This utility model includes a beam structure, an end plate, and a battery cell connected in sequence; the first side includes a first surface and a second surface, the first surface is in contact with the beam structure, and there is a gap between the second surface and the beam structure. The gap can be used to squeeze the glue at the bottom of the battery cell into the gap when the battery cell (the beam structure, end plate, and battery cell are assembled) is put into the box. That is, in addition to the glue at the bottom of the box, glue will be overflowed on the outside of the end plate and the beam body, which increases the adhesive surface and improves the adhesion.

[0017] 2. The boss structure of this utility model can be completely fitted with the first surface and the groove on the second side (that is, the boss structure is inserted into the groove, and the first surface and the part of the beam body located on the boss structure overlap), so that the beam structure, end plate and battery cell are fitted and connected, improving the connection strength, thereby preventing the beam structure, end plate and battery cell from being dislodged by vibration.

[0018] 3. This utility model features a chamfer at the connection between the second surface and the lower surface of the end plate. The chamfer facilitates the flow of adhesive into the gap between the beam and the second surface.

[0019] 4. The boss structure of the beam structure of this utility model can act as a glue-blocking strip when glue overflows, effectively limiting the height of the overflow and ensuring the uniformity of the overflow.

[0020] 5. A tram according to this utility model includes a vehicle body and a CTP battery pack, wherein the CTP battery pack is installed in the tram, thereby improving the practical safety of the tram.

[0021] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 An isometric perspective view of a partial structure of a CTP battery pack according to an embodiment of the present invention is shown.

[0024] Figure 2 A front view schematic diagram of a partial structure of the CTP battery pack according to an embodiment of the present invention is shown.

[0025] Figure 3 A side view schematic diagram of a partial structure of the CTP battery pack according to an embodiment of the present invention is shown.

[0026] Figure 4 An isometric perspective view of the beam structure and end plate of the CTP battery pack according to an embodiment of the present invention is shown.

[0027] Figure 5 The diagram shows a front view of the beam structure and end plate of the CTP battery pack according to an embodiment of the present invention.

[0028] Figure 6 A side view schematic diagram of the beam structure and end plate of the CTP battery pack according to an embodiment of the present invention is shown.

[0029] Figure 7 An axonometric perspective view of the beam structure of the CTP battery pack according to an embodiment of the present invention is shown.

[0030] Figure 8 An isometric perspective view of the end plate of the CTP battery pack according to an embodiment of the present invention is shown.

[0031] Figure 9 This diagram shows a front view of the end plate of the CTP battery pack according to an embodiment of the present invention.

[0032] Figure 10 A side view of the end plate of the CTP battery pack according to an embodiment of the present invention is shown.

[0033] Figure 11 A schematic diagram showing the direction of adhesive overflow in a CTP battery pack according to an embodiment of the present invention is shown.

[0034] Figure 12 A schematic diagram of the overall structure of the CTP battery pack according to an embodiment of the present invention is shown.

[0035] In the diagram, 1 is the beam structure; 11 is the beam body; and 12 is the boss structure.

[0036] 2. End plate; 21. First side surface; 22. Second side surface; 221. First surface; 222. Groove; 223. Second surface;

[0037] 3. Battery cell; 4. Housing. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] In the description of this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples and features of different embodiments or examples described in this utility model without contradiction.

[0040] Example 1,

[0041] refer to Figure 1 , Figure 1 An isometric perspective view of a partial structure of a CTP battery pack according to an embodiment of the present invention is shown. A CTP battery pack includes a beam structure 1, an end plate 2, and battery cells 3 connected in sequence.

[0042] The end plate 2 includes a first side 21 and a second side 22. The first side 21 is connected to the battery cell 3, and the second side 22 is connected to the beam structure 1. The second side 22 includes a first surface 221 and a second surface 223 (see reference). Figure 9 and Figure 10 The first surface 221 is in contact with the beam structure 1, and there is a gap between the second surface 223 and the beam structure 1.

[0043] Specifically, end plate 2 is a solid structure, and the first side 21 is a vertical flat plate. The first side 21 is glued to the large surface of the battery cell 3 (see reference). Figure 2 and Figure 3The beam structure 1 and end plate 2 of this utility model are simple in structure and easy to process. The end plate 2 and the battery cell 3 can be connected to the end side or both sides of the beam structure 1, thus realizing multiple connection functions.

[0044] In this embodiment of the invention, the distance from the first surface 221 to the first side surface 21 is greater than the distance from the second surface 223 to the first side surface 21.

[0045] refer to Figure 7 The beam structure 1 includes a beam body 11 and a boss structure 12. The boss structure 12 is provided on the surface of the beam body 11, and the boss structure 12 mates with the groove 222 on the second side surface 22 (see reference). Figure 4 , Figure 5 and Figure 6 The groove 222 is located between the first surface 221 and the second surface 223. Specifically, the internal cavity of the beam 11 is not limited; it can be a solid or formed into different cavities according to actual needs. The boss structure 12 can be completely fitted with the first surface 221 and the groove 222 of the second side 22 (i.e., the boss structure 12 is inserted into the groove 222, and the first surface 221 overlaps with the part of the beam 11 located on the boss structure 12), so that the beam structure 1 and the end plate 2 are fitted and connected, and the end plate 2 is glued to the large surface of the battery cell 3.

[0046] In the above embodiments, another optional implementation is that the beam 11 and the boss structure 12 are integrally formed. That is, the beam 11 and the boss structure 12 are formed by casting.

[0047] In the above embodiments, another optional implementation is that the beam 11 and the boss structure 12 are fixedly connected. That is, the beam 11 and the boss structure 12 can be two components connected by rivets, bolts, adhesives, or the like.

[0048] refer to Figure 8 The connection between the second surface 223 and the lower surface of the end plate 2 is chamfered. The chamfer facilitates the flow of adhesive into the gap between the beam 11 and the second surface 223.

[0049] In this embodiment of the invention, the first side 21 is completely attached to the battery cell 3. Specifically, the battery cell 3 is fixedly connected by adhesive bonding between the first side 21 and the large surface of the battery cell 3.

[0050] refer to Figure 12 The CTP battery pack also includes a housing 4, in which the beam structure 1, end plates 2, and battery cells 3 are all installed, and the beam structure 1 is fixedly connected to the inner surface of the housing 4. End plates 2 and battery cells 3 can be connected to one side or opposite sides of the beam structure 1 to form the CTP battery pack. Figure 12This is one embodiment of the present utility model, wherein three beam structures 1 are installed in the housing 4, and end plates 2 and battery cells 3 are respectively installed on the inner sides of the two side beam structures 1, and end plates 2 and battery cells 3 are respectively installed on both sides of the middle beam structure 1. The above embodiment is one embodiment of the present utility model and is not intended to limit it.

[0051] refer to Figure 11 , Figure 11 In the diagram, A represents the direction of adhesive overflow. There is a gap between the end plate 2 and the battery cell 3 and the bottom surface of the housing 4. This gap is used to glue the end plate 2 and the battery cell 3 to the bottom surface inside the housing 4.

[0052] Specifically, a gap is left between the outer second surface 223 of the second side 22 and the beam 11. When the assembled battery cells (beam structure 1, end plate 2, and battery cell 3) are placed into the housing 4, the glue at the bottom of the battery cell 3 will be squeezed and overflow into the gap between the outer second surface 223 of the second side 22 and the beam 11. That is, in addition to the glue at the bottom of the housing 4, glue overflow will form between the outer side of the end plate 2 and the beam 11, increasing the adhesive surface. The boss structure 12 of the beam structure 1 can act as a glue-blocking strip when glue overflows, effectively limiting the glue overflow height and ensuring the uniformity of glue overflow. The present invention has multiple functions, including the interlocking connection between the beam structure 1 and the end plate 2, the glue overflow function on the outer side of the end plate 2, and the glue overflow height limitation function of the boss structure 12.

[0053] The assembly of this utility model includes the following steps:

[0054] Step 1: End plates 2 are distributed at one or both ends of the stacked cells 3. The first side 21 of the end plate 2 is glued to the large surface of the stacked cells 3 to form the grouped cells of the CTP battery pack.

[0055] Step 2: The group of battery cells is inserted into the housing 4 through the tooling until the first surface 221 and groove 222 on the outer side of the end plate 2 are completely fitted with the boss structure 12 of the beam structure 1, so that the beam structure 1, the end plate 2 and the battery cell 3 are fitted and connected.

[0056] Step 3: After the battery cells are placed into the box, the glue at the bottom of the battery cell 3 will be squeezed out into the gap between the beam structure 1 and the second surface 223 of the end plate 2, forming an overflow glue surface in the gap between the side of the beam structure 1 and the second surface 223 of the end plate 2.

[0057] Step 4: When glue overflows from the end plate 2, the boss structure 12 of the beam structure 1 acts as a glue-blocking strip, effectively limiting the height of the overflow and ensuring the uniformity of the overflow.

[0058] Example 2,

[0059] An electric vehicle includes a vehicle body and a CTP battery pack of Embodiment 1, wherein the CTP battery pack is installed in the vehicle body. This improves the practical safety of the electric vehicle.

[0060] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0061] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A CTP battery pack characterized by, The CTP battery pack comprises a beam structure (1), an end plate (2) and a battery cell (3) connected in sequence. The end plate (2) comprises a first side (21) and a second side (22), the first side (21) is connected with the battery cell (3), and the second side (22) is connected with the beam structure (1); the second side (22) comprises a first surface (221) and a second surface (223), the first surface (221) is in contact with the beam structure (1), and a gap exists between the second surface (223) and the beam structure (1).

2. The CTP battery pack of claim 1, wherein, The distance from the first surface (221) to the first side (21) is greater than the distance from the second surface (223) to the first side (21).

3. The CTP battery pack of claim 1, wherein, The beam structure (1) comprises a beam body (11) and a boss structure (12), the surface of the beam body (11) is provided with the boss structure (12), the boss structure (12) is matched with the groove (222) of the second side (22), and the groove (222) is located between the first surface (221) and the second surface (223).

4. The CTP battery pack of claim 3, wherein, The beam body (11) and the boss structure (12) are integrally formed.

5. The CTP battery pack of claim 3, wherein, The beam body (11) and the boss structure (12) are fixedly connected.

6. The CTP battery pack of claim 1, wherein, The second surface (223) of the end plate (2) and the lower surface of the end plate (2) are provided with a chamfer.

7. The CTP battery pack of claim 1, wherein, The first side (21) is completely attached to the battery cell (3).

8. A CTP battery pack according to any one of claims 1-7, characterized in that, The CTP battery pack further comprises a box body (4), the beam structure (1), the end plate (2) and the battery cell (3) are all installed in the box body (4), and the beam structure (1) is fixedly connected with the inner surface of the box body (4).

9. The CTP battery pack of claim 8, wherein, The end plate (2) and the battery cell (3) have a gap with the bottom surface of the box body (4).

10. An electric vehicle, characterized by The CTP battery pack comprises a vehicle body and the CTP battery pack according to any one of claims 1-9, and the CTP battery pack is installed in the vehicle body.

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