An interlocking battery top cover structure, battery, and manufacturing method

Abstract

This invention provides an interlocking battery top cover structure, a battery, and a manufacturing method, belonging to the field of lithium batteries. The device includes a battery cell, tabs, a top cover, terminal plates, and a sealing structure. The tabs are disposed on top of the battery cell, and the terminal plates are disposed above the battery cell. The terminal plates include a first terminal plate, a second terminal plate, and a third terminal plate. The first and third terminal plates are connected through the second terminal plate to form a groove-shaped structure. A first mounting hole matching the tab is formed on the first terminal plate. The tab passes through the first mounting hole, is bent, and then welded to the terminal plate. The top cover is disposed above the battery cell and has a second mounting hole. The groove-shaped structure matches the second mounting hole. The sealing structure is disposed between the top cover, the battery cell, and the terminal plates. The interlocking battery top cover structure, battery, and manufacturing method provided by this invention can solve the problem of internal short circuits caused by the interlocking of tabs in the prior art.

Description

Technical Field

[0001] This invention relates to the field of lithium batteries, and in particular to an insertable battery top cover structure, a battery, and a method for its preparation. Background Technology

[0002] With the rapid development of lithium batteries, their safety and stability have also received widespread attention.

[0003] In existing lithium battery technologies, the connection between the tabs and the top cover terminals mainly involves welding the tabs to an adapter plate, and then welding the adapter plate to the terminal. This process results in the adapter plate occupying battery space, increasing cost, and raising the cell's internal resistance.

[0004] In existing lithium battery top cover structures, the tabs are bent after welding. Bending also occupies internal height space of the cell and poses a risk of internal short circuit due to the insertion of the tabs. Summary of the Invention

[0005] This invention provides an insertable battery top cover structure, a battery, and a manufacturing method, which solves the problem of internal short circuits caused by inserting the tabs in existing technologies. The technical solution is as follows:

[0006] In a first aspect, an interlocking battery top cover structure includes: a battery cell, tabs, a top cover, terminal plates, and a sealing structure.

[0007] The tab is disposed on the top of the battery cell, and the electrode plate is disposed above the battery cell. The electrode plate includes a first electrode plate, a second electrode plate, and a third electrode plate. The third electrode plate is annular. The first and third electrode plates are horizontally arranged and connected through the second electrode plate to form a groove structure. The first electrode plate has a first mounting hole that matches the tab. The tab passes through the first mounting hole, is bent, and then welded to the electrode plate.

[0008] The top cover is disposed above the battery cell, and a second mounting hole is provided on the top cover. The groove structure matches the second mounting hole, and the sealing structure is disposed between the top cover and the battery cell and the electrode plate.

[0009] Optionally, the sealing structure includes an upper plastic, a lower plastic, and a sealing ring. The lower plastic is disposed between the top cover and the battery cell, the upper plastic is disposed between the third electrode plate and the top cover, and the sealing ring is disposed at the junction of the first electrode plate and the second electrode plate. The two ends of the sealing ring abut against the upper plastic and the lower plastic, respectively.

[0010] Optionally, the third pole plate is covered with a cap.

[0011] Optionally, a filler is provided between the cap and the first pole plate.

[0012] Optionally, a rubber ring is provided in the first mounting hole, and the electrode tab passes through the rubber ring.

[0013] Optionally, multiple electrodes are provided, and multiple first mounting holes are provided accordingly.

[0014] Secondly, a battery includes the aforementioned through-type battery top cover structure and a housing, wherein the housing is a box-shaped structure with an open top, the top cover is disposed on the opening, and the battery cell is disposed in the housing.

[0015] Optionally, the top cover is provided with a liquid injection hole.

[0016] Optionally, an explosion-proof valve is provided on the top cover.

[0017] Thirdly, a method for fabricating an interlocking battery top cover structure, comprising the aforementioned interlocking battery top cover structure, the steps of which include:

[0018] Step 1: Fit the sealing structure onto the pole plate so that the groove structure is completely covered by the sealing structure;

[0019] Step 2: Match the pole plate to the top cover through the second mounting hole, so that the second mounting hole abuts against the groove structure;

[0020] Step 3: Place the assembled electrode plate, top cover and sealing structure on top of the battery cell, so that the electrode tab matches the first mounting hole;

[0021] Step 4: Pass the electrode tab through the first mounting hole, bend it, and then weld it to the first electrode plate.

[0022] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0023] This invention provides an interlocking battery top cover structure, battery, and manufacturing method. By incorporating a terminal plate, the tabs extend from the top of the battery cell and are welded to the first terminal plate. The battery is then connected to an external electrical device via a third terminal plate for charging and discharging. Compared to traditional technologies that bend the tabs inwards and use connecting pieces to the terminal plate, this invention eliminates the need to bend the tabs inwards, effectively solving the problem of internal short circuits caused by inserting the tabs in the prior art. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall battery structure provided in an embodiment of the present invention;

[0026] Figure 2 This is a side cross-sectional view of the battery structure provided in an embodiment of the present invention;

[0027] Figure 3 This is provided by the embodiments of the present invention. Figure 2 Enlarged view of point A;

[0028] Figure 4 This is a schematic cross-sectional view of the top cover structure provided in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the cross-sectional structure of the pole plate provided in an embodiment of the present invention;

[0030] Figure 6 This is a flowchart of the preparation method provided in the embodiments of the present invention.

[0031] In the diagram: 1-Battery cell; 2-Electrical tab; 3-Top cover; 31-Second mounting hole; 32-Injection hole; 33-Explosion-proof valve; 4-Electrical post plate; 41-First electrode plate; 411-First mounting hole; 42-Second electrode plate; 43-Third electrode plate; 44-Trough structure; 5-Sealing structure; 51-Upper plastic; 52-Lower plastic; 53-Sealing ring; 6-Cap; 7-Filling component; 8-Rubber ring; 9-Housing shell. Detailed Implementation

[0032] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the overall battery structure provided in an embodiment of the present invention; Figure 2 This is a side cross-sectional view of the battery structure provided in an embodiment of the present invention; Figure 3 This is provided by the embodiments of the present invention. Figure 2 Enlarged view of point A; Figure 4 This is a schematic cross-sectional view of the top cover structure provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the pole plate provided in an embodiment of the present invention; Figure 6 This is a flowchart of the preparation method provided in an embodiment of the present invention. Figures 1 to 6 The diagram shows an interlocking battery top cover structure, comprising: a battery cell 1, a tab 2, a top cover 3, a terminal plate 4, and a sealing structure 5. The tab 2 is disposed on top of the battery cell 1, and the terminal plate 4 is disposed above the battery cell 1. The terminal plate 4 includes a first terminal plate 41, a second terminal plate 42, and a third terminal plate 43. The third terminal plate 43 is annular. The first terminal plate 41 and the third terminal plate 43 are horizontally disposed. The first terminal plate 41 and the third terminal plate 42 are connected through the second terminal plate 42 to form a groove structure 44. The first terminal plate 41 has a first mounting hole 411 that matches the tab 2. The tab 2 passes through the first mounting hole 411, is bent, and then welded to the terminal plate 4. The top cover 3 is disposed on top of the battery cell 1, and the top cover 3 has a second mounting hole 31 that matches the groove structure 44. The sealing structure 5 is disposed between the top cover 3 and the battery cell 1 and the terminal plate 4.

[0034] Exemplary, in embodiments of the present invention, such as Figure 1 As shown, the positive and negative electrodes of this battery top cover structure are identical. The sealing structure 5 is fitted onto the terminal plate 4, so that the groove structure 44 is completely covered by the sealing structure 5. The terminal plate 4 is then matched with the top cover 3 through the second mounting hole 31, so that the second mounting hole 31 abuts against the groove structure 44. The assembled terminal plate 4, top cover 3 and sealing structure 5 are placed on top of the cell 1, and the tab 2 is matched and aligned with the first mounting hole 411. Then, the tab 2 is passed through the first mounting hole 411 and bent before being welded to the first terminal plate 41. At this time, the sealing structure 5 is clamped between the top cover 3, terminal plate 4 and cell 1, which is used to insulate the top cover 3 from the terminal plate 4 and cell 1. External electrical equipment can charge and discharge the cell 1 by connecting to the third terminal plate 43. Compared with the traditional battery top cover structure, this structure omits the connecting piece structure, so that external electrical equipment can be directly connected to the third terminal plate 43 for charging and discharging.

[0035] The present invention provides an insertable battery top cover structure, which, by setting an electrode plate 4, extends the tab 2 from the top of the cell 1 and welds it to the outside of the cell 1 and the first electrode plate 41. The tab 2 then extends from the top of the cell 1 and is welded to the first electrode plate 41. It is then connected to an external electrical device for charging and discharging through a third electrode plate 43. Compared with the conventional technology that bends the tab 2 into the cell 1 and sets a connecting piece to connect it to the electrode plate 4, the insertable battery top cover structure, battery and manufacturing method provided by the present invention do not require bending the tab 2 into the cell 1, which can effectively solve the problem of internal short circuit caused by inserting the tab in the prior art.

[0036] Optionally, the sealing structure 5 includes an upper plastic 51, a lower plastic 52, and a sealing ring 53. The lower plastic 52 is disposed between the top cover 3 and the battery cell 1, the upper plastic 51 is disposed between the third electrode plate 43 and the top cover 3, and the sealing ring 53 is disposed at the junction of the first electrode plate 41 and the second electrode plate 42. The two ends of the sealing ring 53 abut against the upper plastic 51 and the lower plastic 52, respectively.

[0037] For example, in this embodiment of the invention, by setting the sealing structure into a three-section structure, it is easier for operators to assemble. Since the sealing structure 5 needs to insulate and isolate the top cover 3 from the battery cell 1, the overall shape of the sealing structure 5 is relatively complex, and the operation of assembling the sealing structure 5 may be relatively complicated. By decomposing the sealing structure 5 into three separate structures, namely the upper plastic 51, the lower plastic 52 and the sealing ring 53, it is easier for operators to assemble. This not only improves the ease of operation of this plug-in battery top cover structure, but also improves production efficiency.

[0038] Optionally, the third pole plate 43 is covered with a cap 6.

[0039] For example, in this embodiment of the invention, the first electrode plate 41, the second electrode plate 42 and the third electrode plate 43 form an upward-opening box-shaped structure. The electrode tab 2 is located at the bottom of the box-shaped structure. By covering the top of the box-shaped structure with a cap 6, the electrode tab 2 can be placed in a closed environment after assembly, providing certain physical protection and dust and water resistance to the electrode tab 2, thereby improving the stability of this plug-in battery top cover structure.

[0040] Optionally, a filler 7 is provided between the cap 6 and the first pole plate 41.

[0041] For example, in this embodiment of the invention, since a box-shaped structure is formed between the first electrode plate 41 and the third electrode plate 43, there is still a large space after the tab 2 is welded to the first electrode plate 41. By setting the filler 7 in this space, after the cap 6 is installed, the tab 2 is pressed tightly onto the first electrode plate 41 by the filler 7, making the connection between the tab 2 and the first electrode plate 41 more stable, thereby further improving the stability of this plug-in battery top cover structure.

[0042] Optionally, a rubber ring 8 is provided inside the first mounting hole 411, and the electrode tab 2 passes through the rubber ring 8.

[0043] For example, in this embodiment of the invention, the tab 2 needs to pass through the first mounting hole 411 for welding. For ease of installation, there is still a large gap in the first mounting hole 411 after the tab 2 passes through. By providing a rubber ring 8 in the first mounting hole 411, the tab 2 is stably fixed in the first mounting hole 411 after passing through the rubber ring 8, preventing the disconnection phenomenon caused by the tab 2 shaking in the first mounting hole 411, thereby further improving the stability of this plug-in battery top cover structure.

[0044] Optionally, multiple tabs 2 are provided, and multiple first mounting holes 411 are provided accordingly.

[0045] For example, in this embodiment of the invention, by providing multiple tabs 2 and multiple first mounting holes 411, multiple tabs 2 can be led out from the battery cell 1 to connect with external devices, so that a larger volume battery cell 1 can be manufactured during the manufacturing process, thereby increasing the capacity of the battery cell 1 and improving the battery capacity of this plug-in battery top cover structure.

[0046] A battery includes the aforementioned plug-in battery top cover structure, and also includes a housing 9, which is a box-shaped structure with an open top, with a top cover 3 covering the opening, and a battery cell 1 disposed in the housing 9.

[0047] For example, in this embodiment of the invention, the battery cell 1 is disposed in the housing 9, which can provide physical protection for the battery cell 1. When the battery cell 1 is subjected to physical impact, the housing 9 can reduce the impact force on the battery cell 1, thereby ensuring the normal operation of the battery cell 1 and further improving the stability of this plug-in battery top cover structure.

[0048] Optionally, the top cover 3 is provided with an injection hole 32.

[0049] For example, in this embodiment of the invention, after the top cover 3 and the housing 9 are assembled, a sealed space is formed inside the battery. By providing an injection hole 32 on the top cover 3, it is convenient to inject electrolyte into the housing 9 after the top cover 3 is installed and sealed. After the injection is completed, the injection hole 32 is then sealed, so that a sealed space is formed inside the battery. By providing an injection hole 32, the ease of operation of this plug-in battery top cover structure is further improved.

[0050] Optionally, an explosion-proof valve 33 is provided on the top cover 3.

[0051] For example, in this embodiment of the invention, an explosion-proof valve 33 is provided. The fundamental cause of thermal runaway of the battery cell 1 is the accumulation of heat due to exothermic side reactions inside the battery cell 1. The rate of heat exchange between the battery cell 1 and the outside is less than the rate of heat accumulation, causing the temperature to rise continuously until it reaches the ignition point temperature, leading to combustion and explosion. To prevent thermal runaway accidents and avoid pressure imbalance between the inside and outside of the battery structure, and considering that a large amount of toxic gas will be generated instantaneously when a lithium battery catches fire, it is necessary to release the gas in a timely and directional manner. The explosion-proof valve 33 can achieve the requirements of maintaining the pressure balance between the inside and outside of the battery structure and directional gas release, serving as a passive safety protection measure to prevent thermal runaway of the battery system. By setting the explosion-proof valve 33, the safety performance of this plug-in battery top cover structure is improved.

[0052] A method for fabricating an interlocking battery top cover structure, comprising the aforementioned interlocking battery top cover structure, the steps of which include:

[0053] S1: The sealing structure 5 is fitted onto the pole plate 4, so that the groove structure 44 is completely covered by the sealing structure 5.

[0054] S2: Match the pole plate 4 with the top cover 3 through the second mounting hole 31, so that the second mounting hole 31 abuts against the groove structure 44.

[0055] S3: Place the assembled pole plate 4, top cover 3 and sealing structure 5 on top of the cell 1 so that the tab 2 matches the first mounting hole 411.

[0056] S4: Pass the tab 2 through the first mounting hole 411 and bend it before welding it to the first pole plate 41.

[0057] Specifically, in this embodiment of the invention, a sealing ring 53 is fitted onto the junction of the first electrode plate 41 and the second electrode plate 42, an upper plastic 51 is fitted onto the junction of the third electrode plate 43 and the second electrode plate 42, and a lower plastic 52 is fitted onto the edge of the first electrode plate 41, so that the groove structure 44 is completely covered by the sealing structure 5. The sealing structure 5 and the electrode plate 4 are inserted into the top cover 3 through the second mounting hole 31, so that the second mounting hole 31 abuts against the groove structure 44, thereby insulating the top cover 3 from the electrode plate 4. The assembled electrode plate 4, top cover 3, and sealing structure 5 are placed on top of the battery cell 1, so that the lower plastic 52 insulating the top cover 3 from the battery cell 1, and the tab 2 matches the first mounting hole 411. A rubber ring 8 is installed in the first mounting hole 411. The electrode lug 2 is passed through the rubber ring 8 and bent from the top of the box-shaped structure formed by the opening of the first electrode plate 41, the second electrode plate 42 and the third electrode plate 43. It is then welded to the first electrode plate 41. The filler 7 is placed in the box-shaped structure and the cap 6 is placed on the third electrode plate 43. The cap 6 compresses the filler 7, so that the filler 7 completely compresses the electrode lug 2 to fit the first electrode plate 41. The cap 6 is then welded to the third electrode plate 43 to fix the whole device.

[0058] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0059] The above description is merely an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A plug-in battery top cover structure, characterized in that, include: The battery cell (1), tabs (2), top cover (3), terminal plate (4), and sealing structure (5). The tab (2) is disposed on the top of the cell (1), and the electrode plate (4) is disposed above the cell (1). The electrode plate (4) includes a first electrode plate (41), a second electrode plate (42), and a third electrode plate (43). The third electrode plate (43) is annular. The first electrode plate (41) and the third electrode plate (43) are horizontally disposed. The first electrode plate (41) and the third electrode plate (43) are connected through the second electrode plate (42) to form a groove structure (44). The first electrode plate (41) has a first mounting hole (411) that matches the tab (2). The tab (2) penetrates the first mounting hole (411), is bent, and then welded to the electrode plate (4). The top cover (3) is placed on top of the battery cell (1). The top cover (3) has a second mounting hole (31). The groove structure (44) matches the second mounting hole (31). The sealing structure (5) is disposed between the top cover (3), the battery cell (1), and the electrode plate (4). The third pole plate (43) is covered with a cap (6), and a filler (7) is provided between the cap (6) and the first pole plate (41) to press the electrode ear (2) onto the first pole plate (41). A rubber ring (8) is provided in the first mounting hole (411), and the electrode ear (2) passes through the rubber ring (8) to fix the electrode ear (2) stably in the first mounting hole (411) and prevent the electrode ear (2) from shaking and causing disconnection.

2. The plug-in battery top cover structure according to claim 1, characterized in that, The sealing structure (5) includes an upper plastic (51), a lower plastic (52), and a sealing ring (53). The lower plastic (52) is disposed between the top cover (3) and the battery cell (1). The upper plastic (51) is disposed between the third electrode plate (43) and the top cover (3). The sealing ring (53) is disposed at the junction of the first electrode plate (41) and the second electrode plate (42). The two ends of the sealing ring (53) abut against the upper plastic (51) and the lower plastic (52) respectively.

3. The interlocking battery top cover structure according to claim 1, characterized in that, The electrode tab (2) is provided in multiple ways, and the first mounting hole (411) is provided in multiple ways.

4. A battery, comprising the insertable battery top cover structure as described in any one of claims 1 to 3, characterized in that, It also includes a housing (9), which is a box-shaped structure with an opening at the top. The top cover (3) is placed on the opening, and the battery cell (1) is disposed in the housing (9).

5. A battery according to claim 4, characterized in that, The top cover (3) is provided with a liquid injection hole (32).

6. A battery according to claim 4, characterized in that, An explosion-proof valve (33) is provided on the top cover (3).

7. A method for manufacturing an interlocking battery top cover structure, comprising the interlocking battery top cover structure as described in any one of claims 1 to 3, wherein the steps include: Step 1: Place the sealing structure (5) onto the pole plate (4) so ​​that the groove structure (44) is completely covered by the sealing structure (5); Step 2: Match the pole plate (4) with the top cover (3) through the second mounting hole (31) so that the second mounting hole (31) abuts against the groove structure (44); Step 3: Place the assembled pole plate (4), top cover (3) and sealing structure (5) on top of the battery cell (1) so that the tab (2) matches the first mounting hole (411); Step 4: Pass the tab (2) through the first mounting hole (411) and bend it before welding it to the first pole plate (41).

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