Power battery structure

Abstract

The utility model relates to the field of power batteries, and discloses a power battery structure, which comprises an outer layer structure, a first filling layer, a second filling layer and a battery cell, the inner part of the outer layer structure is provided with a hollow accommodating cavity, and the first filling layer, the second filling layer and the battery cell are filled in the accommodating cavity. The plurality of second filling layers are matched with the first accommodating cavities and are respectively attached and mounted in the first accommodating cavities, second accommodating cavities are formed in the second filling layers, and the battery cells are tightly arranged in the second accommodating cavities. According to the power battery structure disclosed by the utility model, the second filling layer can be used for fixing the battery cell while the performance of the battery structure is met, the second filling layer is taken out during maintenance and disassembly, the integrity of the first filling layer is reserved on the premise that the outer wall of the second filling layer is damaged, and the second filling layer is relatively easy to manufacture due to small volume, so that the production cost is reduced. Therefore, the difficulty of repairing the second filling layer is low, so that the repairing amount and the repairing cost of the whole power battery structure are greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of power batteries, and in particular to a power battery structure. Background Technology

[0002] As the core energy carrier of new energy vehicles, power batteries typically consist of key components such as cells, module integration systems, thermal management systems, and battery management systems (BMS). Based on differences in packaging, mainstream power batteries can be divided into three main categories: cylindrical, prismatic, and pouch batteries. Among them, cylindrical cells are widely used in the electric vehicle field due to their advantages such as high standardization and flexibility in assembly.

[0003] For cylindrical power battery packs assembled using polyester adhesive injection, technical pain points have been exposed in practical applications: the battery pack consists of several cells, and each cell is fixed in place by using structural adhesive. When it is necessary to replace a cell, maintenance personnel usually use tools to remove the cell after damaging the structural adhesive. This process not only easily damages the cell, but also causes a lot of damage to the structural adhesive. In subsequent maintenance, it is basically necessary to refill the structural adhesive, which increases the cost of adhesive and the difficulty of operation. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a power battery structure to solve the problem that the structural adhesive will be damaged during the disassembly and maintenance of existing battery cells.

[0005] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a power battery structure includes an outer layer structure having a hollow accommodating cavity, a first filling layer, a second filling layer, and a battery cell filled in the accommodating cavity. Multiple first accommodating cavities are formed on the first filling layer. Multiple second filling layers are adapted to the first accommodating cavities and are respectively fitted and installed in each of the first accommodating cavities. A second accommodating cavity is formed in the second filling layer. Multiple battery cells are arranged corresponding to the second filling layer and are tightly disposed in the second accommodating cavities.

[0006] Furthermore, the first filler layer is formed by filling with structural adhesive.

[0007] Furthermore, the first filling layer completely fills the accommodating cavity and its top surface is flush with the top surface of the outer structure.

[0008] Furthermore, the plurality of the first receiving cavities are distributed in a rectangular array.

[0009] Furthermore, the first receiving cavity has a cylindrical structure and the first filling layer extends through it along the thickness direction. The shape of the second filling layer is adapted to the first receiving cavity and is tightly attached between the battery cell and the inner wall of the first receiving cavity. The second filling layer is at the same height as the first filling layer.

[0010] Furthermore, the second filler layer is made of a rigid material.

[0011] Furthermore, the second filler layer is made of an adhesive material.

[0012] Furthermore, the outer structure includes a tray and a cover on top of the tray, the accommodating cavity is recessed from the top surface of the tray, and the cover is connected to the top surface of the tray and seals the accommodating cavity.

[0013] Furthermore, the tray includes a square base plate and side plates that are respectively arranged around the four sides of the base plate and protrude upwards. The accommodating cavity is formed by the base plate and each side plate, and the cover is placed on the top of each side plate.

[0014] Furthermore, the top surface of the cover has an undulating arcuate surface.

[0015] The power battery structure of this utility model has at least the following beneficial effects: by setting a second filling layer between the first filling layer and the cell, the second filling layer can fix the cell while meeting the battery structure performance requirements. During maintenance and disassembly, the second filling layer can be removed, and the integrity of the first filling layer is preserved even if the outer wall of the second filling layer is damaged. Since the second filling layer is relatively easier to manufacture and has a smaller volume, it is easier to repair the second filling layer, which greatly reduces the amount and cost of repair for the entire power battery structure. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the power battery structure of this utility model;

[0018] Figure 2 This is a front sectional view of the power battery of this utility model;

[0019] Figure 3 This is an exploded view of the power battery structure of this utility model.

[0020] The meanings of the labels in the attached diagram are as follows:

[0021] Outer structure 1, tray 11, bottom plate 111, side plate 112, cover 12, arc surface 121, accommodating cavity 13, first filling layer 2, first accommodating cavity 21, second filling layer 3, second accommodating cavity 31, battery cell 4. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0024] 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Please refer to Figures 1 to 3 This utility model's power battery structure can be applied to electric vehicles, electric two-wheelers, power tools, and solar energy storage systems to provide a power source. The power battery structure includes a hollow outer layer 1, a first filling layer 2 filled within the outer layer 1, a second filling layer 3 filled within the first filling layer 2, and a battery cell 4 disposed within the second filling layer 3. The outer layer 1 provides sealing and protection to prevent the battery cell 4 from being affected by external factors. The first filling layer 2 completely fills the interior of the outer layer 1, ensuring the battery cell 4 is positioned securely and does not move after installation, thus guaranteeing its safety. The second filling layer 3 fits tightly between the battery cell 4 and the first filling layer 2, further securing the battery cell 4 and filling the gap between them. Simultaneously, the second filling layer 3 provides stress support during battery cell 4 disassembly, protecting the integrity of both the first filling layer 2 and the battery cell 4. The battery cell 4, as the core component of the power battery, is used for charging and discharging. It should be understood that the power battery structure of this utility model is not limited to the structure of this embodiment. The power battery structure may also include a cooling system, etc. The cooling system includes the design of a liquid cooling system and / or an air cooling system to maintain the stability of the battery temperature.

[0027] In this embodiment, the outer structure 1 includes a tray 11 and a cover 12 covering the top of the tray 11. The tray 11 is hollow inside and open at the top. The cover 12 covers the top of the tray 11 to form a cavity 13 between the cover 12 and the tray 11. The cover 12 is connected to the top surface of the tray 11 to ensure the sealing of the cavity 13 and the disassembly of the entire power battery structure. The cavity 13 can be recessed from the top surface of the tray 11 and has a cuboid structure. The cavity 13 can be integrally formed with the tray 11 by injection molding or by cutting. The first filling layer 2, the second filling layer 3, and the battery cell 4 are all installed in the cavity 13 to ensure the compactness of the entire structure. It should be understood that although this embodiment uses a cuboid battery structure as an example, the actual application is not limited to the structure of this embodiment. For example, it can be set into geometric structures such as cylinders or polygonal prisms depending on the application environment and spatial arrangement.

[0028] In this embodiment, the tray 11 includes a square or rectangular base plate 111 and side plates 112 that are respectively arranged around the four sides of the base plate 111 and protrude upwards. The accommodating cavity 13 is formed by the base plate 111 and the side plates 112 and is also rectangular in structure. The adjacent side plates 112 are sealed together, for example, the base plate 111 and the side plates 112 can be integrally formed. The top surfaces of the side plates 112 are flush. A connector is connected to the outer side wall of one of the side plates 112. The connector is used for electrical connection with external circuits and the battery cell 4 for circuit transmission.

[0029] The cover 12 is fitted onto the top of each side plate 112, its shape and size adapted to the base plate 111. The top surface of the cover 12, i.e., the side facing away from the tray 11, has an undulating arc-shaped surface 121 for automotive use. This arc-shaped surface 121 effectively increases the surface area, facilitating heat dissipation and helping the power battery cool down better in high-temperature environments, ensuring stable battery performance. During assembly, after the first filling layer 2, the second filling layer 3, and the battery cell 4 are assembled, the sides of the cover 12 are bonded to the top surfaces of the four side plates 112 using adhesive or similar methods. Adhesive is then applied to the top of each side to achieve a seal for the outer structure 1.

[0030] In this embodiment, the first filling layer 2 is adapted to and filled within the receiving cavity 13, and the first filling layer 2 completely fills the receiving cavity 13, with its top surface flush with the top edges of the side plates 112 of the outer layer structure 1, to ensure the stability of the battery cell 4. The first filling layer 2 is formed by filling with structural adhesive, and can be used after cooling and molding using a mold, or it can be directly cast and cooled within the receiving cavity 13. Multiple first receiving cavities 21 are formed on the first filling layer 2, and each first receiving cavity 21 is adapted to multiple battery cells 4 and the second filling layer 3 to facilitate the formation of a battery module. The first receiving cavities 21 can be formed by inserting a mold with the same structure as the second filling layer 3 into the corresponding position during the casting process of the first filling layer 2. The multiple first receiving cavities 21 are distributed in a rectangular array to ensure that there are regular intervals between each first receiving cavity 21, reducing the mutual influence between the battery cells 4. Each first receiving cavity 21 has a cylindrical structure and a diameter larger than the diameter of the battery cell 4 to facilitate the installation of the battery cell 4. Each of the first receiving cavities 21 penetrates the first filling layer 2 along its thickness direction. It should be noted that in practical applications, a thermal management system, such as a cold plate or cooling pipe for a cooling structure, is usually installed within the first filling layer 2.

[0031] The second filling layer 3 can be made of a rigid material, such as metal, structural adhesive after cooling and molding, or other adhesive materials. In this embodiment, the second filling layer 3 is made of adhesive material. The shape of the second filling layer 3 is adapted to the first receiving cavity 21. The second filling layer 3 is tightly attached between the battery cell 4 and the inner wall of the first receiving cavity 21, and the two ends of the second filling layer 3 are flush with the top and bottom sides of the first filling layer 2, respectively, and are at the same height as the first filling layer 2. Therefore, the overall structure of the second filling layer 3 is cylindrical and is fitted into the corresponding first receiving cavity 21. A second receiving cavity 31 is formed in the second filling layer 3, which is axially connected. The shape and size of the second receiving cavity 31 are consistent with the shape and size of the battery cell 4, so as to fix the battery cell 4. During manufacturing and assembly, the battery cell 4 can be installed in the first receiving cavity 21, and liquid adhesive or semi-solid adhesive can be poured into the gap between the battery cell 4 and the first receiving cavity 21 until it solidifies to form the second filling layer 3, so that the cross-section of the second filling layer 3 is annular.

[0032] In the embodiment shown, the number of battery cells 4 is the same as the number of second filling layers 3, and each second receiving cavity 31 is provided with a battery cell 4, and the battery cells 4 are tightly attached between the second filling layers 3.

[0033] Based on the above embodiments, the assembly or molding method of the power battery structure of this utility model is as follows: after injecting structural adhesive into the mold of the first filling layer 2 until it cools and solidifies, the molded first filling layer 2 is installed in the accommodating cavity 13, and the battery cell 4 is installed in each of the first accommodating cavities 21 in sequence, leaving a gap between the first accommodating cavity 21 and the battery cell 4, and then injecting structural adhesive into this gap until it cools and solidifies to form the second filling layer 3. In this way, the battery cell 4 is fixed and forms a double support.

[0034] Compared with the prior art, the power battery structure of this utility model has the following advantages: After the first filling layer 2 forms a basic support, the second filling layer 3 is added to further fix the battery cell 4. When it is necessary to disassemble the battery cell 4, only a prying tool is needed to apply force to the second filling layer 3 between the first filling layer 2 and the second filling layer 3. By applying force to the second filling layer 3, the second filling layer 3 is gradually pried up. During this process, the prying tool is supported on the first filling layer 2 and will not be excessively damaged. Even if local damage occurs due to supporting the prying tool, it can be repaired locally without the need for overall recasting, which greatly reduces maintenance costs. The second filling layer 3 is small and made of hard materials or structural adhesive, so it is easy to repair or recast, which greatly reduces labor intensity and cost compared with the traditional method. The rectangular array distribution of the first receiving cavity 21 and the battery cell 4 makes the distribution and heat dispersion more uniform. The setting of the arc surface 121 increases the surface area of ​​the cover, which is more conducive to heat dissipation.

[0035] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A power cell structure, characterized by, include: An outer structure having a hollow accommodating cavity inside; A first filling layer is filled within the receiving cavity, and a plurality of first receiving cavities are formed on the first filling layer; A second filling layer, adapted to accommodate multiple first receiving cavities and respectively fitted into each of the first receiving cavities, forming a second receiving cavity within the second filling layer; and The battery cell is configured in multiple ways corresponding to the second filling layer and is tightly disposed within the second receiving cavity.

2. The power cell structure of claim 1, wherein: The first filler layer is formed by filling with structural adhesive.

3. The power cell structure of claim 2, wherein: The first filling layer fills the accommodating cavity and its top surface is flush with the top surface of the outer structure.

4. The power cell structure of claim 2, wherein: The multiple first receiving cavities are distributed in a rectangular array.

5. The power cell structure of claim 4, wherein: The first receiving cavity has a cylindrical structure and the first filling layer extends through it along the thickness direction. The shape of the second filling layer is adapted to the first receiving cavity and is tightly attached between the battery cell and the inner wall of the first receiving cavity. The second filling layer is at the same height as the first filling layer.

6. The power cell structure of claim 5, wherein: The second filler layer is made of a rigid material.

7. The power cell structure of claim 5, wherein: The second filler layer is made of adhesive material.

8. The power cell structure of claim 1, wherein: The outer structure includes a tray and a cover on top of the tray. The accommodating cavity is recessed from the top surface of the tray, and the cover is connected to the top surface of the tray and seals the accommodating cavity.

9. The power cell structure of claim 8, wherein: The tray includes a square base plate and side plates that are respectively arranged around the four sides of the base plate and protrude upwards. The accommodating cavity is formed by the base plate and each side plate, and the cover is placed on the top of each side plate.

10. The power cell structure of claim 8, wherein: The top surface of the cover has an undulating arc-shaped surface.

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