Prismatic battery and mounting process therefor

Abstract

A prismatic battery and a mounting process therefor. The prismatic battery comprises a pre-integrated assembly, a U-shaped plate (2), a stop frame (3), a housing (5), and a cover plate assembly (6). The pre-integrated assembly is integrated with a terminal assembly (1), a cell stack (4) and a tab (7); the terminal assembly (1) is connected to one end of the tab (7), and the end of the tab (7) away from the terminal assembly (1) is connected to one end of the cell stack (4); the cell stack (4) is mounted in the housing (5); the stop frame (3) is located at the end of the cell stack (4) where the terminal assembly (1) is mounted; the U-shaped plate (2) is mounted at the end of the stop frame (3) away from the cell stack (4), and the U-shaped plate (2) is connected to the housing (5); the U-shaped plate (2) is provided with a U-shaped opening (201), and the terminal assembly (1) is embedded in the U-shaped opening (201); and the cover plate assembly (6) is mounted at the end of the housing (5) away from the stop frame (3). The terminal assembly (1), the cell stack (4) and the tab (7) are pre-integrated to obtain the pre-integrated assembly, such that the tab (7) is directly connected to the cell stack (4), thereby reducing the length of the tab (7), improving the space utilization rate of the housing (5), optimizing the utilization of the internal space of the battery, and facilitating an improvement in the energy density of the battery.

Description

Square shell battery and mounting process thereof TECHNICAL FIELD

[0001] The present application belongs to the technical field of batteries, and particularly relates to a square shell battery and a mounting process thereof. BACKGROUND

[0002] With the promotion of high energy density, no memory effect, long single cycle period, high efficiency, clean and pollution-free characteristics of batteries, its application range has been greatly expanded. Especially in the energy storage industry and the power battery industry, the demand for high capacity and high rate charge and discharge of batteries is increasing. However, in the process of increasing the thickness of the battery, we are faced with a series of challenges, including but not limited to heat management problems, material stability, maintenance of cycle life and cost control. In order to cope with these challenges, researchers are constantly exploring new materials, improving battery design and optimizing manufacturing processes in order to achieve safer, more efficient and more economical battery solutions.

[0003] With the continuous progress of science and technology, battery technology has made significant breakthroughs, especially in the improvement of energy density, the elimination of memory effect, the extension of single battery cycle period and the characteristics of high efficiency and clean pollution. These advantages greatly promote the extensive expansion of battery application fields. In the energy storage industry and the power battery industry, the demand for high capacity and high rate charge and discharge capability of batteries is increasingly urgent, which provides new power and direction for the development of battery technology.

[0004] However, in the process of increasing the thickness of the battery, a series of challenges also come with it. At present, when the square shell battery is installed, the tab needs to be extended to the outside of the shell and assembled with the terminal, which indirectly increases the length of the tab, and the tab also occupies part of the space of the shell, reducing the space utilization rate of the shell for mounting the tab.

[0005] In today's rapidly advancing battery technology, the thickness of batteries is gradually increasing to meet the demand for greater capacity and higher performance. However, this trend has also brought about many challenges. For example, in the case of square shell batteries, a specific problem has been encountered in practical applications: in order to connect with external terminals, the tabs of the battery must be extended to the outside of the shell. This design requirement leads to an increase in the length of the tabs, resulting in additional material costs and potential failure risks. Furthermore, the extension of the tabs occupies space inside the battery shell, which directly affects the layout and arrangement of the internal tabs of the battery, thereby reducing the utilization rate of the internal space of the battery shell. This waste of space not only affects the overall performance of the battery, but also may limit the further improvement of the energy density of the battery. SUMMARY

[0006] In order to solve the problems in the background art, the present application proposes a square shell battery and a mounting process thereof.

[0007] To achieve the above object, the present application adopts the following technical solutions:

[0008] A square shell battery comprises a pre-integrated assembly, a U-shaped plate, a stop frame, a shell and a cover plate assembly.

[0009] The pre-integrated assembly is integrated with a terminal assembly, a core stack and a tab;

[0010] The terminal assembly is connected to one end of the tab, and the end of the tab away from the terminal assembly is connected to one end of the core stack;

[0011] The core stack is installed in the shell;

[0012] The stop frame is located at the end of the core stack where the terminal assembly is installed;

[0013] The U-shaped plate is installed at the end of the stop frame away from the core stack and is connected to the shell;

[0014] The U-shaped plate is provided with a U-shaped opening, and the terminal assembly is embedded in the U-shaped opening;

[0015] The cover plate assembly is installed at the end of the shell away from the stop frame.

[0016] Preferably, a first inner step is provided at the matching position of the terminal assembly and the U-shaped opening, an outer step is provided at the matching position of the U-shaped opening and the terminal assembly, and the first inner step and the outer step are overlapped.

[0017] Preferably, the height of the first inner step and the outer step is 40% to 50% of the thickness of the U-shaped plate.

[0018] Preferably, a second inner step is provided at the connection position of the U-shaped plate and the shell, and the second inner step is inclined.

[0019] A mounting process for a square shell battery, for the square shell battery described above, comprises the following steps:

[0020] Pre-integrating the terminal assembly, the core stack and the tab to obtain a pre-integrated assembly;

[0021] Installing the stop frame at the end of the core stack and passing the terminal assembly through the stop frame;

[0022] Installing the pre-integrated assembly with the stop frame in the shell;

[0023] Installing the U-shaped plate at the end of the shell and pre-point welding;

[0024] Embedding the terminal assembly in the U-shaped opening and welding.

[0025] Preferably, pre-integrating the terminal assembly, the core stack and the tab to obtain a pre-integrated assembly comprises the following steps:

[0026] welding one end of the tab to the core;

[0027] welding the terminal assembly to the other end of the tab, and bending the tab so that the terminal assembly is vertically placed and perpendicular to the core.

[0028] Preferably, the pre-integrated assembly is installed in the shell, including the following steps:

[0029] The terminal assembly is placed in the U-shaped opening, and welded, including the following steps:

[0030] The terminal assembly is placed in the U-shaped opening, and welded, including the following steps:

[0031] Preferably, the pre-integrated assembly is installed in the shell, including the following steps:

[0032] The pre-integrated assembly is placed in the shell, and the cover assembly is installed at one end of the shell, and the pre-fixing is performed by the cover assembly against one end of the core and the adhesive tape.

[0033] Preferably, the U-shaped plate is installed at the end of the shell and is pre-tack welded, including the following steps:

[0034] The U-shaped plate is assembled from the direction perpendicular to the vertically placed terminal assembly until it reaches the end of the shell and covers the stopper.

[0035] The terminal assembly is placed in the U-shaped opening, and welded, including the following steps:

[0036] The terminal assembly is bent so that the stepped surface of the terminal assembly overlaps the stepped surface of the U-shaped opening, and welding is performed at the overlapping part.

[0037] Advantages of the present application:

[0038] 1、The present application pre-integrates the terminal assembly, the core and the tab to obtain a pre-integrated assembly, so that the tab does not need to pass through the shell to be directly connected to the core, thereby reducing the length of the tab, improving the space utilization of the shell for mounting the tab, optimizing the use of the internal space of the battery, and being beneficial to improving the energy density of the battery.

[0039] 2、In the installation process of the present application, the pre-integrated assembly is installed in the shell as a whole, simplifying the installation process and improving the efficiency.

[0040] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structures indicated in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and the ordinary skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0042] Fig. 1 shows a schematic diagram of the explosion of a square shell battery of the present application;

[0043] Fig. 2 shows a schematic diagram of the structure of a U-shaped plate of the present application;

[0044] Fig. 3 shows a schematic diagram of the structure of a step of a U-shaped plate of the present application;

[0045] Fig. 4 shows a connection relationship diagram of a pre-integrated assembly of the present application;

[0046] Fig. 5 shows a mounting process diagram of a square shell battery of the present application;

[0047] Fig. 6 shows a schematic diagram of a comparison of different ways of tab length;

[0048] Fig. 7 shows a schematic diagram of the assembly of a pre-integrated assembly and a shell;

[0049] Fig. 8 shows an assembly effect diagram of the end of a square shell battery of the present application;

[0050] Fig. 9 shows a welding diagram of a terminal assembly and a tab of the present application.

[0051] In the drawings: 1, terminal assembly; 101, first inner step; 2, U-shaped plate; 201, U-shaped opening; 202, outer step; 203, second inner step; 3, stop frame; 4, core stack; 5, shell; 6, cover plate assembly; 7, tab. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by the ordinary skilled in the art without any creative effort are within the protection scope of the present application.

[0053] A square shell battery, as shown in FIG. 1, comprises a terminal assembly 1, a U-shaped plate 2, a stop frame 3, a core stack 4, a shell 5, and a cover assembly 6. As shown in FIG. 4, the terminal assembly 1 is connected with a tab 7, and the tab 7 is connected with one end of the core stack 4 away from the terminal assembly 1. Moreover, the terminal assembly 1, the core stack 4, and the tab 7 can be pre-integrated into a pre-integrated assembly, which is conducive to subsequent installation.

[0054] In addition, the core stack 4 is installed in the shell 5, and the stop frame 3 is located at the end of the core stack 4 where the terminal assembly 1 is installed. The U-shaped plate 2 is installed at the end of the stop frame 3 away from the core stack 4 and is connected with the shell 5. The U-shaped plate 2 is provided with a U-shaped opening 201, and the terminal assembly 1 is embedded in the U-shaped opening 201. The cover assembly 6 is installed at the end of the shell 5 away from the stop frame 3.

[0055] It should be noted that in the design scheme of FIG. 1, the terminal assembly 1 can be directly connected with the core stack 4 through the tab 7, which effectively saves the internal space of the shell 5. At the same time, the U-shaped opening 201 can limit the position of the terminal assembly 1, and the U-shaped opening 201 is also conducive to installation, improving the installation efficiency.

[0056] In order to avoid mutual interference of the parts of the square shell battery during installation, steps or chamfers need to be provided at specific positions. For example, in FIG. 4, a first inner step 101 is provided at the matching position of the terminal assembly 1 and the U-shaped opening 201. In FIG. 2, an outer step 202 is provided at the matching position of the U-shaped opening 201 and the terminal assembly 1. During installation, the first inner step 101 and the outer step 202 can be overlapped. In FIG. 3, a second inner step 203 is provided at the connecting position of the U-shaped plate 2 and the shell 5, and the second inner step 203 is inclined. In addition, the height of the first inner step 101 and the outer step 202 is 40% to 50% of the thickness of the U-shaped plate 2.

[0057] It should be noted that in the above structure, by providing steps or chamfers at specific positions, such as the first inner step 101 and the outer step 202, the mutual interference of the parts of the square shell battery during installation can be effectively avoided, thereby improving the assembly efficiency and precision. In addition, the overlapping design of the first inner step 101 and the outer step 202 ensures the stable matching of the terminal assembly 1 and the U-shaped opening 201, and enhances the structural stability of the battery assembly. The inclined setting of the second inner step 203 helps to guide the correct connection of the U-shaped plate 2 and the shell 5. Therefore, the above design features not only optimize the installation process of the battery assembly, but also improve the overall performance and reliability of the battery.

[0058] It should be further noted that the material of the substrate on the terminal assembly 1 can be the same as that of the U-shaped plate 2, which can be a metal material such as steel, aluminum, or a plastic material. The substrate step structure cooperates with the U-shaped plate 2 and the shell.

[0059] Further, in addition to the U-shaped port 201, other shapes can be used to adapt the parts of the prismatic battery to avoid interference. Here are some examples:

[0060] (1) V-shaped port: A V-shaped port is provided on the U-shaped plate 2. When the terminal assembly 1 is fitted, the corresponding part of the terminal assembly 1 can be designed to match the shape of the V-shaped port, ensuring stability during installation and reducing interference.

[0061] (2) L-shaped port: An L-shaped port is provided on the U-shaped plate 2, and the terminal assembly 1 or related parts are designed in an L shape to adapt to the structure of the L-shaped port, thereby achieving stable installation.

[0062] (3) Semi-circular port: A semi-circular port is provided on the U-shaped plate 2, and the terminal assembly 1 or related parts are designed in a semi-circular shape to adapt to the structure of the semi-circular port, ensuring smooth installation and reducing interference.

[0063] When designing these shapes, the size, shape, and mechanical requirements during installation of the parts need to be considered to ensure that the functional requirements are met while also achieving smooth installation of the parts and long-term stable operation.

[0064] As shown in Figure 5, it is an installation process for a prismatic battery, which is used for the prismatic battery described above, including the following steps:

[0065] S1: Pre-integrate the terminal assembly 1, the core stack 4, and the tab 7 to obtain a pre-integrated assembly.

[0066] S2: Install the stopper frame 3 at the end of the core stack 4, and make the terminal assembly 1 pass through the stopper frame 3.

[0067] S3: Install the pre-integrated assembly with the stopper frame 3 in the shell 5.

[0068] S4: Install the U-shaped plate 2 at the end of the shell 5 and perform pre-point welding.

[0069] S5: Embed the terminal assembly 1 into the U-shaped port 201 and perform welding.

[0070] As shown in Figure 6, Figure 6(a) corresponds to the process of S1, which directly welds the core 4 with the terminal assembly 1. Figure 6(b) corresponds to the traditional process, in which the tab 7 needs to pass through the shell 5 to connect with the external terminal assembly 1, and the shell 5 needs more space to place the tab 7. Therefore, as can be seen from Figure 6, if the traditional structure is adopted, the shell 5 needs to be assembled first, and then the terminal assembly 1 is assembled, so that the terminal assembly 1 needs to be outside the shell 5, and in the extreme case, it is close to the shell 5. The internal core 4 needs longer tabs 7 to extend out to weld with the terminal assembly 1. After the longer tab 7 is bent and assembled, more internal space is needed to store the tab 7. After adopting the scheme of Figure 6(a), the terminal assembly 1 can be welded before the core 4 or the roll core is put into the shell, so that the distance between the core 4 or the roll core and the terminal assembly 1 is shortened, and the length of the tab 7 is shortened. Under the same internal space condition, the size of the tab can be lengthened, and the space used to store the long tab in the traditional design can be used to fill the tab, so that the capacity is increased. At the same time, since the terminal assembly 1 is much smaller than the mouth of the shell 5, the core 4 or the roll core with the welded terminal assembly 1 is easy to enter the shell, which can be realized in the process.

[0071] For example, as shown in Figures 7 and 9, in S1, the terminal assembly 1, the core 4 and the tab 7 are pre-integrated to obtain a pre-integrated assembly, including the following steps:

[0072] S101: weld one end of the tab 7 with the core 4;

[0073] S102: weld the terminal assembly 1 with the other end of the tab 7, and bend the tab 7, so that the terminal assembly 1 is vertically placed and perpendicular to the core 4.

[0074] For example, in S2, the stop frame 3 is installed at the end of the core 4, and the terminal assembly 1 passes through the stop frame 3, including the following steps:

[0075] Wrap the stop frame 3 around the terminal assembly 1, so that the stop frame 3 is pressed on the core 4;

[0076] Wrap the core 4 and the stop frame 3 with a Mylar film, and heat the Mylar film and the stop frame 3 to fix them.

[0077] For example, in S3, the pre-integrated assembly with the installed stop frame 3 is installed in the shell 5, including the following steps:

[0078] Place the pre-integrated assembly in the shell 5, and install the cover assembly 6 at one end of the shell 5, so that the cover assembly 6 abuts against one end of the core 4, and is pre-fixed with adhesive tape.

[0079] For example, in S4, the U-shaped plate 2 is installed at the end of the shell 5 and is pre-point welded, including the following steps:

[0080] The U-shaped plate 2 is assembled from the direction perpendicular to the vertically placed terminal assembly 1 until reaching the end of the shell 5 and covering the stopper 3.

[0081] Exemplarily, the terminal assembly 1 is embedded into the U-shaped opening 201 and welded, including the following steps:

[0082] The tab 7 is bent so that the stepped surface of the terminal assembly 1 is overlapped on the stepped surface of the U-shaped opening 201 and welded at the overlapped position, and finally a schematic diagram of the battery end is obtained as shown in FIG. 8.

[0083] Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A prismatic battery, characterized by, The pre-integrated assembly, the U-shaped plate (2), the stop frame (3), the shell (5) and the cover plate assembly (6); The pre-integrated assembly is integrated with the terminal assembly (1), the core (4) and the tab (7); The terminal assembly (1) is connected with one end of the tab (7), and the other end of the tab (7) is connected with one end of the core (4); The core (4) is installed in the shell (5); The stop frame (3) is located at the end of the core (4) where the terminal assembly (1) is installed; The U-shaped plate (2) is installed at the end of the stop frame (3) away from the core (4) and is connected with the shell (5); The U-shaped plate (2) is provided with a U-shaped opening (201), and the terminal assembly (1) is embedded in the U-shaped opening (201); The cover plate assembly (6) is installed at the end of the shell (5) away from the stop frame (3).

2. A prismatic cell according to claim 1, wherein The first inner step (101) is provided at the matching position of the terminal assembly (1) and the U-shaped opening (201), the outer step (202) is provided at the matching position of the U-shaped opening (201) and the terminal assembly (1), and the first inner step (101) and the outer step (202) are overlapped.

3. A prismatic cell according to claim 2, wherein The height of the first inner step (101) and the outer step (202) is 40%-50% of the thickness of the U-shaped plate (2).

4. A prismatic cell according to claim 2, wherein The second inner step (203) is provided at the connecting position of the U-shaped plate (2) and the shell (5), and the second inner step (203) is inclined.

5. A mounting process for a prismatic battery according to any one of claims 1 to 4, characterized by, The steps include: Pre-integrating the terminal assembly (1), the core (4) and the tab (7) to obtain a pre-integrated assembly; Installing the stop frame (3) at the end of the core (4) and making the terminal assembly (1) pass through the stop frame (3); Installing the pre-integrated assembly with the stop frame (3) in the shell (5); Installing the U-shaped plate (2) at the end of the shell (5) and pre-point welding; Embedding the terminal assembly (1) in the U-shaped opening (201) and welding.

6. The process of claim 5, wherein the process further comprises: Pre-integrating the terminal assembly (1), the core (4) and the tab (7) to obtain a pre-integrated assembly, including the following steps: Welding one end of the tab (7) to the core (4); Welding the terminal assembly (1) to the other end of the tab (7) and bending the tab (7) to make the terminal assembly (1) stand vertically and be perpendicular to the core (4).

7. The process of claim 6, wherein the process further comprises: Installing the stop frame (3) at the end of the core (4) and making the terminal assembly (1) pass through the stop frame (3), including the following steps: Sleeving the stop frame (3) over the terminal assembly (1) to make the stop frame (3) press on the core (4); Wrapping the core (4) and the stop frame (3) with Mylar film and heat sealing the Mylar film and the stop frame (3) to fix them.

8. The process of claim 6, wherein the process further comprises: Installing the pre-integrated assembly with the stop frame (3) in the shell (5), including the following steps: Placing the pre-integrated assembly in the shell (5) and installing the cover plate assembly (6) at one end of the shell (5) to press against one end of the core (4) through the cover plate assembly (6) and pre-fixing with adhesive tape.

9. The process of claim 6, wherein, Installing the U-shaped plate (2) at the end of the shell (5) and pre-point welding, including the following steps: The U-shaped plate (2) is assembled from the direction perpendicular to the vertically placed terminal assembly (1) until the end of the shell (5) and covers the stopper frame (3).

10. The process of claim 6-9, wherein the process is characterized by, The terminal assembly (1) is embedded into the U-shaped opening (201) and welded, including the following steps: The tab (7) is bent so that the stepped surface of the terminal assembly (1) overlaps the stepped surface of the U-shaped opening (201), and welding is performed at the overlapping part.

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