Shell structure of battery and single battery

Abstract

The utility model relates to a shell structure of a battery and the battery, comprising a body, at least one end of which is provided with an opening; the extension body comprises an embedding and inserting body and a nesting body, the embedding and inserting body is connected with the opening, the nesting body is provided with at least one nesting opening, and the nesting body can stretch out and draw back in the length direction of the extension body so that the embedding and inserting body can be embedded into the nesting body through the nesting opening; and the body and the extension body can form an accommodating cavity with an adjustable space. According to the utility model, a certain large surface or side surface of the shell structure can be stretched and contracted, so that the internal space of the shell structure can be temporarily expanded when the battery cell enters the shell, the battery cell is prevented from being collided and extruded when entering the shell, and the extrusion of the top cover and the battery cell to the tab is also reduced because no external force is used for pushing the top cover inwards, so that the reliability of the battery cell is improved. The damage to the tabs and the risk of inverted insertion of the tabs are reduced; and the shell design has higher inclusiveness, so that the group margin of the battery is higher, and the energy density of the battery cell is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery shell structure and a battery monomer. Background Art

[0002] The energy density of a battery cell represents the average amount of electrical energy released per unit volume or mass of the battery and is a key indicator of battery performance. For a given electrochemical energy storage device, the ratio of the energy that can be charged to the mass or volume of the energy storage medium is the battery's energy density. The more energy a battery cell delivers per unit weight, the greater its energy density. Therefore, to increase the energy density of a battery cell, the limited space within the housing can be utilized to design the cell dimensions. However, some battery cells requiring high energy density may require the maximum possible space within the housing during design, resulting in a larger group margin. It should be noted that group margin refers to the ratio of the cell diameter to the housing diameter.

[0003] The shortcoming of the existing technology is that during the battery assembly process, since the shell structure is a fixed structure, it is difficult to put the finished battery cell into the shell, causing the battery cell to be squeezed. Excessive squeezing may cause damage to the battery cell, thereby reducing the product yield. Utility Model Content

[0004] To this end, the technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a battery shell structure and a battery cell. The design of the shell structure is mainly achieved by designing the shell to have a "stretchable" structure, so that the space inside the shell is temporarily expanded when the finished battery cell is put into the shell, thereby avoiding squeezing and collision of the battery cell, ensuring the integrity of the battery cell, and improving the performance of the battery cell.

[0005] In order to solve the above technical problems, the utility model provides a battery shell structure, including:

[0006] a body having an opening at at least one end;

[0007] The extension body includes an insert body and a nested body, the insert body is connected to the opening, the nested body has at least one nested opening, and the nested body can be extended and retracted along the length direction of the extension body so that the insert body can be embedded in the nested body through the nested opening; the main body and the extension body can form a space-adjustable accommodating cavity, which is used to accommodate battery cells.

[0008] In one embodiment of the present invention, the inserting body is slidably connected to the nesting body.

[0009] In one embodiment of the present invention, the insertable body includes a plurality of first connecting plates connected in sequence, each of the first connecting plates includes a first hollow shell and a sliding body, the sliding body is embedded in the first hollow shell and is slidably connected to the first hollow shell; the nested body includes a plurality of second connecting plates connected in sequence, and a third connecting plate connecting the same end of the plurality of second connecting plates, each of the second connecting plates includes a second hollow shell, one end of the second hollow shell has the nesting opening, and the second hollow shell can accommodate the first hollow shell.

[0010] In one embodiment of the present invention, a latch is provided at one end of the first hollow shell away from the body, and a slot is provided at one end of the second hollow shell away from the body. When the second hollow shell moves toward the body and moves into contact with the first hollow shell, the latch can be engaged with the slot.

[0011] In one embodiment of the present invention, the length of the sliding body is not greater than the length of the first hollow shell.

[0012] In one embodiment of the present invention, the length of the first hollow shell is equal to the length of the second hollow shell.

[0013] In one embodiment of the present invention, a sealing material is further provided in the first hollow shell.

[0014] In one embodiment of the present invention, the first hollow shell is provided with a discharge port, and the discharge port is used for the sealing material to flow between the first hollow shell and the second hollow shell.

[0015] In one embodiment of the present invention, there are multiple discharge ports, and the multiple discharge ports are symmetrically arranged on both sides of the first hollow shell.

[0016] The present invention also provides a battery cell, comprising a battery cell, a top cover and a battery shell structure as described above, wherein the shell structure has an opening for inserting the battery cell, and the top cover is connected to the opening to close the shell structure.

[0017] The above technical solution of the utility model has the following advantages compared with the prior art:

[0018] The shell structure of a battery described in the present invention includes a main body and an extension body. The main body and the extension body cooperate to form a space-adjustable accommodation cavity, in which the battery cell is accommodated. The extension body includes an inserting body and a nesting body, wherein the nesting body has a nesting opening, and the nesting body can move along the length direction of the extension body, so that the inserting body is embedded in the nesting body through the nesting opening. With such a configuration, compared with the traditional shell, a large surface or side surface of the shell structure of the present invention can stretch and shrink, so that when the battery cell enters the shell, the internal space of the shell structure can be temporarily expanded, thereby avoiding collision and extrusion of the battery cell when entering the shell. Moreover, since there is no external force to push the top cover inward, the top cover and the battery cell are also reduced. The extrusion of the pole ear by the top cover and the battery cell is reduced, reducing the damage to the pole ear and the risk of the pole ear being inserted upside down; the shell design has greater inclusiveness, so that the battery group margin is higher, which is conducive to improving the energy density of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the utility model easier to understand, the utility model is further described in detail below based on the specific embodiments of the utility model in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the present utility model.

[0021] Figure 2 yes Figure 1 Schematic diagram of the top view structure.

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the second hollow shell along its thickness direction in a preferred embodiment of the present invention.

[0023] Figure 4 It is a schematic cross-sectional structural diagram of the first hollow shell, the sliding body and the sealing material in a preferred embodiment of the present utility model.

[0024] Figure 5 It is a schematic cross-sectional structural diagram of the sliding body and the first hollow shell in a preferred embodiment of the present utility model.

[0025] Figure 6 It is a schematic cross-sectional structural diagram of a preferred embodiment of the present invention in which the first hollow shell and the second hollow shell are completely nested.

[0026] Explanation of the reference numerals in the specification: 1. Main body; 2. Extension body; 20. Nesting opening; 21. Inserting body; 210. First hollow shell; 2101. Fastener; 2102. Discharge port; 2103. Sealing material; 211. Sliding body; 22. Nesting body; 220. Second hollow shell; 2201. Slot. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0028] Example 1

[0029] Reference Figure 1 and Figure 3 As shown, the present invention discloses a battery shell structure, comprising a body 1 , wherein at least one end of the body 1 has an opening.

[0030] The housing structure further includes an extension body 2 , which includes an inserting body 21 and a nesting body 22 , wherein the inserting body 21 is connected to the opening.

[0031] The nested body 22 has at least one nesting opening 20. The nested body 22 is capable of extending and contracting along the length of the extension body 2, allowing the inserting body 21 to be inserted into the nested body 22 through the nesting opening 20. The length of the extension body 2 can also be considered the extension and contraction direction of the housing structure. The interior of the nested body 22 is hollow to accommodate the movement of the inserting body 21 within the nested body 22 along the extension and contraction direction.

[0032] The main body 1 and the extension body 2 cooperate to form a receiving cavity with adjustable space, and the receiving cavity is used to accommodate the battery cell.

[0033] It can be seen from this that the shell structure of a battery to be protected by the present invention includes a main body and an extension body, the main body and the extension body cooperate to form a space-adjustable accommodation cavity, the battery cell is accommodated in the accommodation cavity, the extension body includes an inserting body and a nesting body, wherein the nesting body has a nesting opening, and the nesting body can move along the length direction of the extension body, so that the inserting body is embedded in the nesting body through the nesting opening. With such a configuration, compared with the traditional shell, a large surface or side surface of the shell structure of the present invention can stretch and shrink, so that when the battery cell enters the shell, the internal space of the shell structure can be temporarily expanded, thereby avoiding collision and extrusion of the battery cell when entering the shell, and since there is no external force to push the top cover inward, the top cover and the battery cell are also reduced. The extrusion of the tabs by the top cover and the battery cell is reduced, reducing the damage to the tabs and the risk of inverted insertion of the tabs; the shell design has greater inclusiveness, so that the battery group margin is higher, which is conducive to improving the energy density of the battery cell.

[0034] Combine Figure 2As shown, in order to make the movement of the insert 21 in the nested body 22 smoother, the insert 21 is slidably connected to the nested body 22. As a preferred embodiment, a slide rail design can be used between the insert 21 and the nested body 22 to ensure smoothness during relative movement. Specifically, the slide rail structure can include a slide groove and a slider. The slide groove can be provided on the surface of the insert 21 that contacts the nested body 22, and the nested body 22 is provided with a slider that matches the slide groove; of course, the slide groove can also be provided on the surface of the nested body 22 that contacts the insert 21, and the insert 21 is provided with a slider that matches the slide groove; in some other embodiments, the nested body 22 can be provided with both a slide groove and a slider, and the insert 21 is provided with a slider and a slide groove that match the nested body 22.

[0035] refer to Figure 4 、 Figure 5 as well as Figure 6 As shown, as a preferred embodiment, the insert body 21 includes a plurality of first connecting plates connected in sequence, each of the first connecting plates includes a first hollow shell 210 and a sliding body 211, the sliding body 211 is embedded in the first hollow shell 210, and the sliding body 211 is slidably connected to the first hollow shell 210, and the sliding body 211 can move along the telescopic direction.

[0036] The nested body 22 includes a plurality of second connecting plates connected in sequence, and a third connecting plate connecting the same end of the plurality of second connecting plates. Each of the second connecting plates includes a second hollow shell 220. One end of the second hollow shell 220 has the nesting opening 20. The second hollow shell 220 can accommodate the first hollow shell 210.

[0037] Since the housing structure is a square structure, in order to improve the consistency of the housing structure, the inserting body 21 includes four first connecting plates connected in sequence, and the nesting body 22 includes four second connecting plates connected in sequence.

[0038] according to Figure 5 as well as Figure 6 As shown, in order to enable the first hollow shell 210 to be stably connected to the second hollow shell 220, a latch 2101 is provided at the end of the first hollow shell 210 away from the body 1, and a slot 2201 is provided at the end of the second hollow shell 220 away from the body 1. When the second hollow shell 220 moves toward the body 1 and moves until it contacts the first hollow shell 210, the latch 2101 can be engaged with the slot 2201 to clamp the second hollow shell 220 and the first hollow shell 210 to each other.

[0039] As a preferred embodiment, two of the fasteners 2101 are provided, and the two fasteners 2101 are symmetrically arranged on the edge of the first hollow shell 210. The fasteners 2101 are configured to have a protrusion facing the second hollow shell 220, so that the fasteners 2101 can better cooperate with the slots 2201.

[0040] Correspondingly, since there are two fasteners 2101, the number of the slots 2201 is configured to be consistent with the number of the fasteners 2101, so that the two slots 2201 are symmetrically arranged on the inner wall of the second hollow shell 220, and the shape of the slots 2201 is configured to match the fasteners 2101. With such a configuration, when the second hollow shell 220 is driven to slide along the telescopic direction, it can achieve a tight snap connection with the first hollow shell 210 after sliding to the extreme position, thereby ensuring the stability of the connection between the first hollow shell 210 and the second hollow shell 220 and avoiding shaking.

[0041] It should be noted that in order for the sliding body 211 to be well accommodated inside the first hollow shell 210 when one end of the sliding body 211 moves to abut against the first hollow shell 210 , the length of the sliding body 211 is not greater than that of the first hollow shell 210 .

[0042] As a preferred embodiment, in order to ensure the consistency of the structure of the extension body 2, improve the sealing performance, and ensure that the first hollow shell 210 and the second hollow shell 220 are adapted to each other, the length of the first hollow shell 210 is set to be equal to the length of the second hollow shell 220.

[0043] It should be noted that due to the "movability" of the telescopic shell surface, a gap is generated when the telescopic shell surface contacts other shell surfaces. Therefore, compared to traditional shells, the shell structure of the present invention has higher requirements for airtightness. When the second hollow shell 220 moves to completely fit within the first hollow shell 210, the first hollow shell 210 and the second hollow shell 220 can be welded by laser welding to achieve a sealing effect. In this way, it is possible to ensure good sealing between the first hollow shell 210 and the second hollow shell 220 and improve the structural strength.

[0044] Example 2

[0045] The laser welding method used in Example 1 may pose a risk of damaging the battery cells during actual production. For example, "laser leakage" may occur during the welding process, causing certain damage to the battery cells and thus reducing the product yield. Therefore, unlike Example 1, in this embodiment, a sealing material 2103 is used for filling to achieve a sealing effect and prevent gas exchange.

[0046] refer to Figure 4 、 Figure 5 as well as Figure 6 As shown, a sealing material 2103 is further provided in the first hollow shell 210 . Specifically, the first hollow shell 210 is provided with a discharge port 2102 , and the discharge port 2102 is used for the sealing material 2103 to flow between the first hollow shell 210 and the second hollow shell 220 .

[0047] Combine Figure 5 As shown, to ensure uniformity in the flow of the sealing material 2103 between the first hollow housing 210 and the second hollow housing 220, a plurality of discharge ports 2102 are provided, and the plurality of discharge ports 2102 are symmetrically arranged on both sides of the first hollow housing 210. Specifically, the plurality of discharge ports 2102 are evenly spaced and arranged on the first hollow housing 210, and the arrangement direction of the plurality of discharge ports 2102 on each side is perpendicular to the expansion and contraction direction.

[0048] During the assembly process, after the battery cell is inserted into the shell, a force F is applied along the expansion and contraction direction. When the sliding body 211 is driven to move, during the continuous movement, the overlapping area of ​​the first hollow shell 210 and the second hollow shell 220 gradually increases and moves to touch the bottom of the first hollow shell 210. At this time, the end of the first hollow shell 210 where the fastener 2102 is located is flush with the bottom of the second hollow shell 220. At this time, the force F applied to the sliding body 211 disappears, the fastener 2102 is clamped with the slot 2201, and the sealing material 2103 flows out along the discharge port 2102 in succession, thereby filling the second hollow shell 220 to achieve a dense effect. The fastener 2102 cooperates with the fastening structure of the slot 2201, and then the top cover at the other end is welded to further strengthen the first hollow shell 210 and the second hollow shell 220, thereby improving the overall airtightness while ensuring the high strength of the overall structure.

[0049] Example 3

[0050] The present invention further provides a battery cell, comprising a battery cell, a top cover, and a battery housing structure as described in Embodiment 1 or 2. The housing structure has an opening for inserting the battery cell, and the top cover is connected to the opening to close the housing structure.

[0051] From this, it can be seen that the battery cell protected by this utility model has a retractable shell structure. During assembly, when the battery cell is inserted into the shell, the space inside the shell can be temporarily expanded, thereby preventing the battery cell from being squeezed and impacted, ensuring the integrity of the battery cell and improving its performance. Furthermore, it can reduce damage to the tabs and the risk of tabs being inserted upside down. The shell design has greater inclusiveness, thereby increasing the battery group margin and facilitating the improvement of the battery cell's energy density.

[0052] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0053] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0054] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0055] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A battery housing structure, characterized in that: include, A body (1) having an opening at at least one end; An extension body (2) comprises an inserting body (21) and a nesting body (22), wherein the inserting body (21) is connected to the opening, the nesting body (22) has at least one nesting opening (20), and the nesting body (22) can be extended and retracted along the length direction of the extension body (2) so that the inserting body (21) is embedded in the nesting body (22) through the nesting opening (20); the main body (1) and the extension body (2) can form a space-adjustable accommodating cavity, and the accommodating cavity is used to accommodate a battery cell.

2. The battery housing structure according to claim 1, wherein: The inserting body (21) is slidably connected to the nesting body (22).

3. A battery housing structure according to claim 1 or 2, characterized in that: The inserting body (21) includes a plurality of first connecting plates connected in sequence, each of the first connecting plates includes a first hollow shell (210) and a sliding body (211), the sliding body (211) is embedded in the first hollow shell (210) and is slidably connected to the first hollow shell (210); the nesting body (22) includes a plurality of second connecting plates connected in sequence, and a third connecting plate connected to the same end of the plurality of second connecting plates, each of the second connecting plates includes a second hollow shell (220), one end of the second hollow shell (220) has the nesting opening (20), and the second hollow shell (220) can accommodate the first hollow shell (210).

4. The battery housing structure according to claim 3, wherein: A latching member (2101) is provided at one end of the first hollow shell (210) away from the body (1), and a latching slot (2201) is provided at one end of the second hollow shell (220) away from the body (1); when the second hollow shell (220) moves toward the body (1) and moves until it contacts the first hollow shell (210), the latching member (2101) can be latched in the latching slot (2201).

5. The battery housing structure according to claim 3, characterized in that: The length of the sliding body (211) is not greater than the length of the first hollow shell (210).

6. The battery housing structure according to claim 3, characterized in that: The length of the first hollow shell (210) is equal to the length of the second hollow shell (220).

7. The battery housing structure according to claim 3, characterized in that: A sealing material (2103) is further provided in the first hollow shell (210).

8. The battery casing structure according to claim 7, characterized in that: The first hollow shell (210) is provided with a discharge port (2102), and the discharge port (2102) is used for the sealing material (2103) to flow between the first hollow shell (210) and the second hollow shell (220).

9. The battery casing structure according to claim 8, characterized in that: There are multiple discharge ports (2102), and the multiple discharge ports (2102) are symmetrically arranged on both sides of the first hollow shell (210).

10. A battery cell, characterized in that: A battery shell structure comprising a battery cell, a top cover and a battery as claimed in any one of claims 1 to 9, wherein the shell structure has an opening for inserting the battery cell, and the top cover is connected to the opening to close the shell structure.

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