Square-shell battery and mounting process thereof

Abstract

The invention belongs to the technical field of batteries, and provides a square-shell battery and a mounting process thereof, and the square-shell battery comprises a pre-integrated assembly, a U-shaped plate, a stop frame, a shell and a cover plate assembly; the pre-integrated component is integrated with a terminal assembly, a laminated core and a tab; the terminal assembly is connected with one end of the tab, and one end of the tab away from the terminal assembly is connected with one end of the stack core; the laminated core is arranged in the shell; the stop frame is positioned at the end part of the laminated core mounting terminal assembly; the U-shaped plate is mounted at one end, far away from the stacked core, of the stop frame and is connected with the shell; the U-shaped plate is provided with a U-shaped opening, and the terminal assembly is embedded into the U-shaped opening; the cover plate assembly is installed at the end, away from the stop frame, of the shell. According to the invention, the pre-integrated assembly is obtained by pre-integrating the terminal assembly, the laminated core and the tab, so that the tab is directly connected with the laminated core without penetrating through the shell, thereby reducing the length of the tab, improving the space utilization rate of the shell for mounting the pole piece, optimizing the utilization of the internal space of the battery, and being beneficial to improving the energy density of the battery.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a square shell battery and an installation process thereof. Background Art

[0002] Driven by the high energy density, no memory effect, long single-cell cycle, high efficiency, cleanliness and pollution-free characteristics of batteries, their application range has been greatly expanded. Especially in the energy storage industry and power battery industry, the demand for high capacity and high-rate charge and discharge of batteries is growing. However, in the process of increasing battery thickness, we face a series of challenges, including but not limited to thermal management issues, material stability, cycle life maintenance and cost control. In order to meet 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 advancement of science and technology, battery technology has made significant breakthroughs, especially in the improvement of energy density, elimination of memory effect, extension of single-cell battery cycle, and high efficiency, cleanliness and pollution-free characteristics. These advantages have greatly promoted the extensive expansion of battery applications. In the energy storage industry and power battery industry, the demand for high capacity and high-rate charge and discharge capabilities of batteries is becoming increasingly urgent, which provides new impetus and direction for the development of battery technology.

[0004] However, as the thickness of the battery increases, a series of challenges also arise. At present, when installing square-shell batteries, the tabs need to be extended outside the shell to assemble with the terminals, which indirectly increases the length of the tabs. At the same time, the tabs also occupy part of the space of the shell, reducing the space utilization of the shell to install the pole pieces.

[0005] As battery technology continues to advance, the thickness of batteries has gradually increased to meet the needs of larger capacity and higher performance. However, this trend has also brought many challenges. Taking square shell batteries as an example, they have encountered a specific problem in practical applications: in order to connect to external terminals, the battery's tabs must extend to the outside of the shell. This design requirement leads to an increase in the length of the tabs, which brings additional material costs and potential risks of failure. Furthermore, the extension of the tabs occupies the space inside the battery shell, which directly affects the layout and arrangement of the pole pieces inside the battery, thereby reducing the utilization rate of the space inside the battery shell. This waste of space not only affects the overall performance of the battery, but may also limit the further improvement of the battery's energy density. Summary of the invention

[0006] In order to solve the problems in the background technology, the present invention provides a square shell battery and an installation process thereof.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

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

[0009] The pre-integrated component integrates a terminal assembly, a stacked core and a tab;

[0010] The terminal assembly is connected to one end of the pole lug, and the end of the pole lug away from the terminal assembly is connected to one end of the stacked core;

[0011] The stacked core is installed in a housing;

[0012] The stop frame is located at the end of the stacked core mounting terminal assembly;

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

[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 mounted on one end of the housing away from the stop frame.

[0016] Preferably, a first inner step is provided at the mating position between the terminal assembly and the U-shaped opening, an outer step is provided at the mating position between the U-shaped opening and the terminal assembly, and the first inner step overlaps the outer step.

[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 between the U-shaped plate and the shell, and the second inner step is inclined.

[0019] A square shell battery installation process, used for the square shell battery mentioned above, comprises the following steps:

[0020] Pre-integrate the terminal assembly, the stacked core and the tab to obtain a pre-integrated component;

[0021] Install the stop frame at the end of the stacked core and pass the terminal assembly through the stop frame;

[0022] Installing the pre-integrated assembly with the stop bracket installed in the housing;

[0023] Install the U-shaped plate at the end of the shell and perform pre-spot welding;

[0024] Insert the terminal assembly into the U-shaped opening and perform welding.

[0025] Preferably, the terminal assembly, the stacked core and the tab are pre-integrated to obtain a pre-integrated component, comprising the following steps:

[0026] Weld one end of the pole ear to the stacked core;

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

[0028] Preferably, the stop frame is installed at the end of the stacked core, and the terminal assembly is passed through the stop frame, including the following steps:

[0029] Put the stop frame over the terminal assembly so that the stop frame presses on the stacked core;

[0030] The stacked core and the stop frame are wrapped with Mylar film, and the Mylar film and the stop frame are fixed by hot stamping.

[0031] Preferably, installing the pre-integrated assembly with the stop bracket in the housing comprises the following steps:

[0032] Place the pre-integrated component in the shell, install the cover assembly at one end of the shell, use the cover assembly to press against one end of the stacked core, and pre-fix it with tape.

[0033] Preferably, the U-shaped plate is mounted on the end of the shell and pre-spot welded, comprising the following steps:

[0034] Assemble the U-shaped plate perpendicular to the vertically placed terminal assembly until it reaches the end of the housing and covers the stop frame.

[0035] Preferably, the terminal assembly is embedded in the U-shaped opening and welded, comprising the following steps:

[0036] Bend the tabs so that the step surface of the terminal assembly overlaps the step surface of the U-shaped opening, and weld at the overlap.

[0037] Beneficial effects of the present invention:

[0038] 1. The present invention pre-integrates the terminal assembly, the stacked 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 stacked core, thereby reducing the length of the tab and improving the space utilization rate of the shell for installing the pole piece, optimizing the utilization of the internal space of the battery, and being conducive to improving the energy density of the battery;

[0039] 2. In the installation process of the present invention, the pre-integrated components are installed in the housing as a whole, which simplifies the installation process and improves efficiency.

[0040] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A schematic diagram of an explosion of a square shell battery of the present invention is shown;

[0043] Figure 2 A schematic diagram of the structure of the U-shaped plate of the present invention is shown;

[0044] Figure 3 A schematic structural diagram of a step of a U-shaped plate of the present invention is shown;

[0045] Figure 4 A connection diagram of the pre-integrated components of the present invention is shown;

[0046] Figure 5 A diagram showing the installation process of a square-shell battery of the present invention is shown;

[0047] Figure 6 A schematic diagram comparing the lengths of the tabs in different ways is shown;

[0048] Figure 7 A schematic diagram of assembling the pre-integrated component and the housing is shown;

[0049] Figure 8 The figure shows the assembly effect of the end of the square shell battery of the present invention;

[0050] Fig. 9 The terminal assembly and the pole ear welding diagram of the present invention are shown.

[0051] In the figure: 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. stacked core; 5. housing; 6. cover plate assembly; 7. pole ear. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] A square shell battery, such as Figure 1 As shown, it includes a terminal assembly 1, a U-shaped plate 2, a stop frame 3, a stacked core 4, a housing 5 and a cover assembly 6. Figure 4 It can be seen that the terminal assembly 1 is connected with a tab 7, and the end of the tab 7 away from the terminal assembly 1 is connected to one end of the stacked core 4. Moreover, the terminal assembly 1, the stacked core 4 and the tab 7 can be pre-integrated into a pre-integrated component, which is convenient for subsequent installation.

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

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

[0056] In order to avoid interference between the parts of the square battery during installation, steps or chamfers need to be set at specific locations. Figure 4 In the embodiment, a first inner step 101 is provided at the mating position between the terminal assembly 1 and the U-shaped opening 201. Figure 2 In the embodiment, an outer step 202 is provided at the place where the U-shaped opening 201 and the terminal assembly 1 cooperate. During installation, the first inner step 101 and the outer step 202 can overlap. Figure 3 In the embodiment, the second inner step 203 is provided at the connection between 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 setting steps or chamfers at specific positions, such as the first inner step 101 and the outer step 202, the mutual interference of the various parts of the square shell battery during the installation process can be effectively avoided, thereby improving the assembly efficiency and accuracy. In addition, the overlapping design of the first inner step 101 and the outer step 202 ensures the stable fit between 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 between 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 explained 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 matches the U-shaped plate 2 and the housing.

[0059] Furthermore, in addition to the U-shaped opening 201, other shapes may be used to adapt to the parts of the square-shell battery to avoid mutual interference. The following are some embodiments:

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

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

[0062] (3) Semicircular opening: A semicircular opening is provided on the U-shaped plate 2, and the terminal assembly 1 or related parts are designed to be semicircular to adapt to the structure of the semicircular opening to ensure smooth installation and reduce interference.

[0063] When designing these shapes, it is necessary to consider the size and shape of the parts as well as the mechanical requirements during installation to ensure that the parts can be installed smoothly and work stably for a long time while meeting the functional requirements.

[0064] like Figure 5 As shown, a square shell battery installation process is used for the square shell battery mentioned above, comprising the following steps:

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

[0066] S2: Install the stop frame 3 at the end of the stacked core 4 and pass the terminal assembly 1 through the stop frame 3.

[0067] S3: Install the pre-integrated assembly with the stop bracket 3 in the housing 5 .

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

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

[0070] like Figure 6 As shown, Figure 6 (a) corresponds to the process of S1, in which the stacked core 4 is directly welded to the terminal assembly 1. Figure 6(b) corresponds to the traditional process, in which the tab 7 needs to pass through the housing 5 to connect with the external terminal assembly 1, and the housing 5 needs more space to place the tab 7. Figure 6 It can be seen that if the traditional structure is used, the housing 5 needs to be assembled first, and then the terminal assembly 1 is assembled. In this way, the terminal assembly 1 needs to be outside the housing 5, and in the extreme case, it is also close to the housing 5. The internal stacked core 4 needs a longer tab 7 to extend out and be welded with the terminal assembly 1. After the longer tab 7 is bent and assembled, more internal space is required to store the tab 7. Figure 6 After the scheme (a), the terminal assembly 1 can be welded before the stacked core 4 or the wound core is put into the shell, so that the distance between the stacked core 4 or the wound core and the terminal assembly 1 will be shortened, and the length of the required pole ear 7 will be shortened. Under the same internal space, the size of the pole piece can be lengthened, and part of the space used to store the long pole ear in the traditional design can be used to fill the pole piece, thus increasing the capacity. At the same time, since the terminal assembly 1 is much smaller than the mouth of the shell 5, the stacked core 4 or the wound core welded to the terminal assembly 1 is easy to put into the shell, which can be achieved from a process point of view.

[0071] Exemplary, combined Figure 7 and Fig. 9 It can be seen that in S1, the terminal assembly 1, the stacked core 4 and the tab 7 are pre-integrated to obtain a pre-integrated component, including the following steps:

[0072] S101: welding one end of the tab 7 to the stacked core 4;

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

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

[0075] Put the stop frame 3 on the terminal assembly 1 so that the stop frame 3 is pressed on the stacked core 4;

[0076] The stacked core 4 and the stop frame 3 are wrapped with Mylar film, and the Mylar film and the stop frame 3 are fixed by hot stamping.

[0077] Exemplarily, in S3, the pre-integrated assembly with the stop frame 3 installed in the housing 5 includes the following steps:

[0078] The pre-integrated component is placed in the housing 5, and the cover plate assembly 6 is installed at one end of the housing 5, and the cover plate assembly 6 is pressed against one end of the stacked core 4 and pre-fixed with tape.

[0079] Exemplarily, in S4, the U-shaped plate 2 is mounted on the end of the shell 5 and pre-spot welded, including the following steps:

[0080] The U-shaped plate 2 is assembled from a direction perpendicular to the vertically placed terminal assembly 1 until it reaches the end of the housing 5 and covers the stop frame 3 .

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

[0082] Bend the tab 7 so that the step surface of the terminal assembly 1 overlaps the step surface of the U-shaped opening 201, and weld at the overlap, and finally obtain the following Figure 8 Schematic diagram of the battery terminals shown.

[0083] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions 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 invention.

Claims

1. A square shell battery, characterized in that: It comprises a pre-integrated component, a U-shaped plate (2), a stop frame (3), a housing (5) and a cover plate assembly (6); The pre-integrated component integrates a terminal assembly (1), a stacked core (4) and a tab (7); The terminal assembly (1) is connected to one end of the pole lug (7), and the end of the pole lug (7) away from the terminal assembly (1) is connected to one end of the stacked core (4); The stacked core (4) is installed in a housing (5); The stop frame (3) is located at the end of the stacked core (4) mounting terminal assembly (1); The U-shaped plate (2) is mounted on an end of the stop frame (3) away from the stacked core (4) and 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); The cover plate assembly (6) is mounted on an end of the housing (5) away from the stop frame (3).

2. A square shell battery according to claim 1, characterized in that: A first inner step (101) is provided at the mating position between the terminal assembly (1) and the U-shaped opening (201), an outer step (202) is provided at the mating position between 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 square shell battery according to claim 2, characterized in that: The heights of the first inner step (101) and the outer step (202) are 40% to 50% of the thickness of the U-shaped plate (2).

4. A square shell battery according to claim 2, characterized in that: A second inner step (203) is provided at the connection between the U-shaped plate (2) and the shell (5), and the second inner step (203) is arranged at an inclination.

5. A square shell battery installation process, used for the square shell battery according to any one of claims 1 to 4, characterized in that: The following steps are involved: Pre-integrating the terminal assembly (1), the stacked core (4) and the tab (7) to obtain a pre-integrated component; Install the stop frame (3) at the end of the stacked core (4), and allow the terminal assembly (1) to pass through the stop frame (3); Installing the pre-integrated assembly with the stop frame (3) in the housing (5); Installing the U-shaped plate (2) at the end of the shell (5) and pre-spot welding; Insert the terminal assembly (1) into the U-shaped opening (201) and perform welding.

6. A square shell battery installation process according to claim 5, characterized in that: Pre-integrating the terminal assembly (1), the stacked core (4) and the tab (7) to obtain a pre-integrated component includes the following steps: Welding one end of the pole ear (7) to the stacked core (4); The terminal assembly (1) is welded to the other end of the tab (7), and the tab (7) is bent so that the terminal assembly (1) is placed vertically and perpendicular to the stacked core (4).

7. A square shell battery installation process according to claim 6, characterized in that: The stop frame (3) is installed at the end of the stacked core (4), and the terminal assembly (1) is passed through the stop frame (3), including the following steps: Put the stop frame (3) on the terminal assembly (1) so that the stop frame (3) is pressed on the stacked core (4); The stacked core (4) and the stop frame (3) are wrapped with Mylar film, and the Mylar film and the stop frame (3) are fixed by hot stamping.

8. The installation process of a square shell battery according to claim 6, characterized in that: The pre-integrated assembly with the stop frame (3) installed in the housing (5) comprises the following steps: The pre-integrated component is placed in a shell (5), and a cover plate assembly (6) is installed at one end of the shell (5). The cover plate assembly (6) is pressed against one end of the stacked core (4) and is pre-fixed with adhesive tape.

9. The installation process of a square shell battery according to claim 6, characterized in that: The U-shaped plate (2) is mounted on the end of the shell (5) and pre-spot welded, comprising the following steps: The U-shaped plate (2) is assembled perpendicularly to the vertically placed terminal assembly (1) until it reaches the end of the housing (5) and covers the stop frame (3).

10. A square shell battery installation process according to any one of claims 6-9, characterized in that: The terminal assembly (1) is inserted into the U-shaped opening (201) and welded, comprising the following steps: The pole lug (7) is bent so that the step surface of the terminal assembly (1) overlaps the step surface of the U-shaped opening (201), and welding is performed at the overlap.

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