Inverted battery cell

Abstract

In the inverted battery cell, a lower shell is of a hollow structure with a top opening; the core package is arranged in the lower shell and comprises a battery cell tab; the top opening is covered with the isolation plastic plate structure, the glue injection groove is concavely formed in the periphery of the upper surface of the isolation plastic plate structure, the tab penetrating groove penetrates through the isolation plastic plate structure so that the battery cell tab can extend out, the sealing cover is connected with the tab penetrating groove in a sealed mode, the liquid injection hole is formed in the isolation plastic plate structure, and the rubber nail is assembled with the liquid injection hole in a matched mode. The anti-explosion valve is arranged on the isolation plastic plate structure; the pole is arranged on the isolation plastic plate structure and is connected with the battery cell tab; the plastic insulating plate is arranged on the isolation plastic plate structure and comprises a pole hole for exposing the pole; and the upper cover plate assembly covers the plastic insulating plate and forms a sealing structure with the lower shell. According to the inverted battery cell, the overall structural stability of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cells, in particular to an inverted cell. Background Art

[0002] Consumers' further demands for long endurance and fast charging of new energy vehicles have put forward higher requirements for the energy density, high-current overcurrent capacity, etc. of vehicle-mounted lithium-ion power batteries. On the other hand, the cell has a large energy density and a harsh working environment, and there will be a safety risk of internal aging and short circuit of the cell in extreme cases. Therefore, manufacturers usually add an explosion-proof valve design to the cell structure, and open the valve under a set pressure to timely discharge the by-product gas inside the cell to prevent the cell from exploding.

[0003] In addition, relying on the CTP design of the battery pack, some manufacturers have proposed an inverted cell solution, that is, integrating the single cell into the pack structure during vehicle installation, and at the same time making the external pole column and the explosion-proof valve opening face down. Based on this, even if a serious side reaction occurs inside the single cell, the electrolyte and gas will spray towards the bottom of the vehicle, thus minimizing the safety risk to the vehicle occupants. When the cell is inverted, the internal electrolyte accumulates at the bottom and submerges the adapter plate area. When the cell is charged and discharged, the adapter plate is welded with the tab and plays a current collecting role, and the local temperature is significantly higher. In order to ensure the performance of the electrolyte during long-term use, a new formulation design is required to increase its high-temperature resistance. The new electrolyte design requires an increase in development and material costs, and the development cycle is also relatively long. When the cell is inverted, the immersion of the electrolyte in the explosion-proof valve position will cause accelerated corrosion in the area, which may lead to the inability of the explosion-proof valve to open normally in extreme cases, increasing the safety risk. The existing solution is to use aerospace-grade anti-corrosion materials in the explosion-proof valve area and perform structural and sealing reinforcement treatments to ensure its normal functionality. The new anti-corrosion materials require an increase in development and material costs, and there is a risk of reduced yield in welding.

[0004] In summary, on the premise of ensuring the perfect safety function of the cell and improving the space utilization rate, how to carry out effective structural design has become an urgent problem to be solved at present.

[0005] The above information disclosed in the background art is only used to enhance the understanding of the background of the present utility model, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide an inverted cell, which solves the problem of excessive electrolyte temperature caused by the immersion of the electrolyte in the adapter plate and pole column positions, and solves the problem of corrosion and abnormal opening of the explosion-proof valve caused by the immersion of the electrolyte in the explosion-proof valve.

[0007] In order to achieve the above purpose, the present utility model provides the following technical solutions:

[0008] An inverted battery cell of the present utility model comprises:

[0009] A lower housing, which is a hollow structure with an open top;

[0010] A battery cell package, which is arranged inside the lower housing, and the battery cell package includes battery cell tabs;

[0011] An isolation plastic plate structure, which covers the open top, and the isolation plastic plate structure includes,

[0012] A glue injection groove, which is recessed at the periphery of the upper surface of the isolation plastic plate structure;

[0013] A tab through groove, which penetrates through the isolation plastic plate structure to extend the battery cell tabs;

[0014] A sealing cover, which is sealingly connected to the tab through groove;

[0015] A liquid injection hole, which is arranged on the isolation plastic plate structure;

[0016] A rubber nail, which is assembled with the liquid injection hole in a matching manner;

[0017] An explosion-proof valve, which is arranged on the isolation plastic plate structure;

[0018] A terminal post, which is arranged on the isolation plastic plate structure and is connected to the battery cell tabs;

[0019] A plastic insulating plate, which is arranged on the isolation plastic plate structure, and the plastic insulating plate includes a terminal post hole exposing the terminal post;

[0020] An upper cover plate assembly, which covers the plastic insulating plate and forms a sealing structure with the lower housing.

[0021] In the inverted battery cell described above, the isolation plastic plate structure is connected to the bottom surface of the plastic insulating plate.

[0022] In the inverted battery cell described above, a recess for accommodating the folded battery cell tabs is provided on one side of the tab through groove.

[0023] In the inverted battery cell described above, the upper cover plate assembly is provided with a boss aligned with the terminal post hole.

[0024] In the inverted battery cell described above, the boss is provided with a central hole adapted to the terminal post.

[0025] In the inverted battery cell described above, the plastic insulating plate and the upper cover plate assembly are respectively provided with pressure relief holes aligned with the explosion-proof valve.

[0026] In the inverted battery cell described above, the plastic insulating plate and the upper cover plate assembly are respectively provided with diversion holes aligned with the liquid injection hole.

[0027] In the described inverted battery cell, the sealing cover includes a protrusion facing the ear through groove.

[0028] In the described inverted battery cell, the rubber plug includes a disc adapted to the liquid injection hole and a rod body extending from the disc.

[0029] In the described inverted battery cell, the inverted battery cell has a square structure.

[0030] In the above technical solution, the inverted battery cell provided by the present utility model has the following beneficial effects: For the inverted battery cell, the electrolyte is isolated from the adapter plate and the explosion-proof valve, avoiding the technical requirements for high-temperature-resistant electrolyte and corrosion-proof explosion-proof valve, reducing the cost of the battery cell; making full use of the spare space inside the battery cell, without increasing the extra height in the longitudinal direction, saving space; the isolation plastic plate structure fixes the ear and supports the core package when the battery cell is inverted, improving the overall structural stability of the battery cell to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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 required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is an exploded structural schematic diagram of the inverted battery cell of the present utility model.

[0033] Figure 2 It is a structural schematic diagram of the isolation plastic plate of the inverted battery cell of the present utility model.

[0034] Figure 3 It is a bottom view schematic diagram of the isolation plastic plate of the inverted battery cell of the present utility model.

[0035] Figure 4 It is a structural schematic diagram of the sealing cover of the inverted battery cell of the present utility model.

[0036] Figure 5 It is a structural schematic diagram of the rubber plug of the inverted battery cell of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0042] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a direct connection, or an indirect connection through an intermediate medium, and may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0044] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0045] As Figures 1-5 shown, in one embodiment, an inverted battery cell of the present utility model includes

[0046] A lower housing 501, which is a hollow structure with an open top;

[0047] A battery cell package, which is arranged inside the lower housing 501, and the battery cell package includes battery cell tabs;

[0048] An isolation plastic plate structure 401, which covers the open top, and the isolation plastic plate structure 401 includes

[0049] A glue injection groove 402, which is recessed at the periphery of the upper surface of the isolation plastic plate structure 401;

[0050] A tab through groove 404, which penetrates through the isolation plastic plate structure 401 to extend the battery cell tabs;

[0051] A sealing cover 403, which is sealingly connected to the tab through groove 404;

[0052] A liquid injection hole 406, which is arranged on the isolation plastic plate structure 401;

[0053] A rubber nail 405, which is assembled with the liquid injection hole 406 in a matching manner;

[0054] The explosion-proof valve 407 is provided on the isolation plastic plate structure 401;

[0055] The pole column 301 is provided on the isolation plastic plate structure 401 and connected to the cell pole ear;

[0056] The plastic insulating plate 201 is provided on the isolation plastic plate structure 401, and the plastic insulating plate 201 includes a pole column hole exposing the pole column 301;

[0057] The upper cover plate assembly 101 covers the plastic insulating plate 201 and forms a sealing structure with the lower housing 501.

[0058] In a preferred embodiment of the inverted cell, the isolation plastic plate structure 401 is connected to the bottom surface of the plastic insulating plate 201.

[0059] In a preferred embodiment of the inverted cell, a recess for accommodating the folded cell pole ear is provided on one side of the pole ear through slot 404.

[0060] In a preferred embodiment of the inverted cell, the upper cover plate assembly 101 is provided with a boss aligned with the pole column hole.

[0061] In a preferred embodiment of the inverted cell, the boss is provided with a central hole adapted to the pole column.

[0062] In a preferred embodiment of the inverted cell, the plastic insulating plate 201 and the upper cover plate assembly 101 are respectively provided with pressure relief holes aligned with the explosion-proof valve 407.

[0063] In a preferred embodiment of the inverted cell, the plastic insulating plate 201 and the upper cover plate assembly 101 are respectively provided with diversion holes aligned with the liquid injection hole 406.

[0064] In a preferred embodiment of the inverted cell, the sealing cover 403 includes a protrusion facing the pole ear through slot 404.

[0065] In a preferred embodiment of the inverted cell, the rubber nail 405 includes a disc adapted to the liquid injection hole 406 and a rod body extending from the disc.

[0066] In a preferred embodiment of the inverted cell, the inverted cell is of a square structure.

[0067] In one embodiment, the pole column includes a transfer piece and a column body provided on the transfer piece.

[0068] In one embodiment, the depth of the glue injection groove 402 should be higher than the thickness of the bottom of the adapter so that the isolation plastic plate structure 401 is connected to the bottom surface of the plastic insulating plate 201; the sealing cover 403 and the pole ear groove 404 cooperate with each other in structure, and maintain longitudinal consistency with the pole and the adapter in spatial position; the rubber nail 405 and the injection hole 406 cooperate with each other in structure, and maintain longitudinal consistency with the injection perforation in the upper cover plate assembly 101 and the plastic insulating plate 201 in spatial position; the explosion-proof valve 407 maintains longitudinal consistency with the injection perforation in the upper cover plate assembly 101 and the plastic insulating plate 201 in spatial position.

[0069] The specific assembly method is as follows:

[0070] The upper cover assembly 101, the plastic insulating plate 201, and the pole are pre-assembled into an integral structure in a longitudinal alignment; the rubber nail 405 and the injection hole 406 are pre-assembled, and the center rod passes through the opening of the injection hole 406; the length of the center rod is greater than the thickness of the insulating plastic plate to ensure that the bottom is not sealed when the battery cell is upright, and the battery cell can be vented normally when it is formed; when the battery cell is inverted, it fits with the annular area at the bottom of the injection hole 406 to prevent the electrolyte from leaking out; the lower shell 501 and the core package lead out the battery cell tabs, pass through the tab slots 404 and are folded. Figure 2 Glue is dispensed on the surface of the recessed folded battery cell tab in the shaded area shown, and then the sealing cover 403 is matched with it and sealed by high-temperature curing; the lead-out battery cell tab and the bottom of the adapter are welded normally; the glue injection groove 402 is glued and brought into contact with the plastic insulating plate 201 and sealed by high-temperature curing; the external laser welding between the upper cover plate and the lower shell 501 is completed, and the overall structure of the battery cell is formed; the normal battery cell is placed upright for subsequent liquid injection, formation, and external sealing nail welding processes, after which the battery cell can be arranged externally.

[0071] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0072] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An inverted battery cell, characterized in that: These include, A lower shell, which is a hollow structure with an open top; A core package, which is arranged in the lower shell, and the core package includes a battery cell tab; An isolation plastic plate structure is covered on the top opening, and the isolation plastic plate structure includes: The glue injection groove is recessed on the periphery of the upper surface of the isolation plastic plate structure. The tab groove is penetrated through the isolation plastic plate structure to extend the tab of the battery cell. A sealing cover, which is sealed and connected to the tab groove, The injection hole is provided in the isolation plastic plate structure, A rubber nail, which is adapted to be assembled with the injection hole, An explosion-proof valve, which is arranged on the isolation plastic plate structure; A pole, which is arranged on the isolation plastic plate structure and connected to the battery cell pole ear; A plastic insulating plate, which is arranged on the isolation plastic plate structure, and the plastic insulating plate includes a pole hole exposing the pole; An upper cover plate assembly covers the plastic insulating plate and forms a sealing structure with the lower shell.

2. An inverted battery cell according to claim 1, characterized in that: The isolation plastic board structure is connected to the bottom surface of the plastic insulation board.

3. An inverted battery cell according to claim 1, characterized in that: A recess for accommodating the folded battery cell tab is provided on one side of the tab slot.

4. An inverted battery cell according to claim 1, characterized in that: The upper cover plate assembly is provided with a boss aligned with the pole hole.

5. An inverted battery cell according to claim 4, characterized in that: The boss is provided with a central hole adapted to the pole.

6. An inverted battery cell according to claim 1, characterized in that: The plastic insulating plate and the upper cover plate assembly are respectively provided with pressure relief holes aligned with the explosion-proof valve.

7. An inverted battery cell according to claim 1, characterized in that: The plastic insulating plate and the upper cover plate assembly are respectively provided with flow guide holes aligned with the liquid injection holes.

8. An inverted battery cell according to claim 1, characterized in that: The sealing cover comprises a protrusion facing the tab penetration groove.

9. The inverted battery cell according to claim 1, characterized in that: The rubber nail comprises a disc adapted to the liquid injection hole and a rod body extending from the disc.

10. The inverted battery cell according to claim 1, characterized in that: The inverted battery cell has a square structure.

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