Bipolar battery cell structure capable of being injected with liquid to prevent explosion

Abstract

The utility model relates to an anti-explosion bipolar battery cell structure capable of being injected with liquid, which comprises a first end plate, at least one battery cell unit and a second end plate, and the battery cell unit is arranged between the first end plate and the second end plate; each battery cell unit comprises a first current collector, a cell body, a metal ring sealing ring and a second current collector; the first current collector, the metal ring sealing ring and the second current collector are sequentially stacked to form a sealed cavity, the metal ring sealing ring is arranged on the outer side of the core body in a sleeving mode, and the core body abuts against the first current collector and the second current collector; at least one anti-explosion liquid injection hole is formed in the metal ring sealing ring, and the anti-explosion liquid injection hole is communicated with the sealing cavity. According to the invention, the liquid injection and explosion-proof functions are realized through the metal sealing ring, the process and the function of a conventional lithium battery are better matched, the explosion-proof safety performance of the battery cell is enhanced, and the battery cell has relatively high practicability and economical efficiency and can be produced and used as a general product.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a liquid-fillable explosion-proof bipolar battery cell structure. Background Technology

[0002] With the rise and development of new energy, lithium batteries are being used in more and more scenarios; however, due to the low voltage of a single cell, single cells must be connected in series to form a battery pack for use in any application scenario.

[0003] Traditional battery cell structures typically use electrodes of the same polarity, with both sides of the electrode sharing the same polarity (either both positive or both negative). These electrodes are stacked in parallel to increase capacity, but this does not improve voltage. Furthermore, traditional cell structures generally rely on injection holes in the top cover for electrolyte filling, which can lead to uneven wetting and negatively impact cell performance. Utility Model Content

[0004] Based on this, the present invention provides a liquid-fillable explosion-proof bipolar battery cell structure, which aims to solve the problems of uneven wetting of the battery cell due to the liquid filling method of existing bipolar battery cells through the top cover, which affects the performance of the battery cell, low explosion-proof safety performance of the battery cell, and high manufacturing cost.

[0005] To achieve the above objectives, the present invention proposes the following technical solution: a liquid-fillable explosion-proof bipolar battery cell structure, comprising a first end plate, at least one battery cell unit, and a second end plate, wherein the battery cell unit is disposed between the first end plate and the second end plate;

[0006] Each cell unit includes a first current collector, a core, a metal ring sealing ring, and a second current collector; the first current collector, the metal ring sealing ring, and the second current collector are stacked sequentially to form a sealed cavity, the metal ring sealing ring is sleeved on the outside of the core, and the core abuts against the first current collector and the second current collector respectively.

[0007] The metal ring seal is provided with at least one explosion-proof injection hole, which is connected to the sealing cavity.

[0008] In a preferred embodiment, the metal ring sealing ring includes a metal ring and a sealing ring, with the metal ring being fitted into the sealing ring; the explosion-proof injection hole is disposed inside the metal ring, and the explosion-proof injection hole extends from one side of the metal ring to the other side of the metal ring.

[0009] In a preferred embodiment, a through-hole screw is provided in the explosion-proof injection hole; the end of the through-hole screw near the core is connected to the sealing cavity, and an explosion-proof nut is provided at the end of the through-hole screw away from the core.

[0010] In a preferred embodiment, a sealing washer is provided at one end of the through-hole screw near the explosion-proof nut; the sealing washer is fitted onto the through-hole screw, and the sealing washer abuts against the explosion-proof nut and the metal ring respectively.

[0011] In a preferred embodiment, the through-hole screw is adapted to the explosion-proof injection hole; the through-hole screw is adapted to the explosion-proof nut and the sealing washer respectively; and the metal ring is adapted to the sealing ring.

[0012] In a preferred embodiment, the sealing ring is a U-shaped sealing ring; the opening of the U-shaped sealing ring faces the explosion-proof nut; the side of the U-shaped sealing ring near the core is provided with a first groove that matches the through-hole screw.

[0013] In a preferred embodiment, the first groove surrounds the through-hole screw, and the first groove is adapted to the through-hole screw.

[0014] In a preferred embodiment, the metal ring is provided with a second groove that matches the first groove. The second groove is adapted to the first groove and the through-hole screw respectively. The first groove covers the outside of the second groove, and the through-hole screw passes through the second groove and the first groove in sequence and communicates with the sealing chamber.

[0015] In a preferred embodiment, the metal ring is further provided with a third groove, and the explosion-proof nut and the sealing washer are both accommodated in the third groove, and the explosion-proof nut and the sealing washer are respectively adapted to the third groove.

[0016] In a preferred embodiment, the explosion-proof nut and the through-hole screw are connected by threads.

[0017] In a preferred embodiment, the explosion-proof nut is provided with a polygonal groove; the bottom of the polygonal groove is provided with explosion-proof markings.

[0018] In a preferred embodiment, the polygonal groove is one of a hexagonal groove, a pentagonal groove, or a square groove.

[0019] In a preferred embodiment, the metal ring has raised ribs on its side surface, and the raised ribs are circumferentially arranged on the side surface of the metal ring; the metal ring is an aluminum ring or a stainless steel ring.

[0020] In a preferred embodiment, the core includes an insulating ring, a first electrode, a second electrode, and a diaphragm; the insulating ring is sleeved on the outside of the diaphragm, the first electrode abuts against one side of the diaphragm, and the second electrode abuts against the other side of the diaphragm; and the insulating ring is sleeved on the outside of the first electrode and the second electrode; the insulating ring abuts against the sealing ring;

[0021] The first electrode is disposed in contact with the first current collector, and the second electrode is disposed in contact with the second current collector.

[0022] In a preferred embodiment, the insulating ring is provided with a circular hole that communicates with the through-hole screw; both sides of the insulating ring are provided with a fourth groove that communicates with the circular hole; each of the fourth grooves has multiple notches on the side away from the sealing ring; the multiple notches are equally spaced.

[0023] In a preferred embodiment, the first electrode is a positive electrode and the second electrode is a negative electrode; or, the first electrode is a negative electrode and the second electrode is a positive electrode.

[0024] In a preferred embodiment, the first current collector abuts against the first end plate, and the second current collector abuts against the second end plate; one side of the first current collector is coated with a first coating, and the other side is coated with a second coating; one side of the second current collector is coated with a first coating, and the other side is coated with a second coating.

[0025] In a preferred embodiment, the first coating is a positive electrode coating and the second coating is a negative electrode coating; or, the first coating is a negative electrode coating and the second coating is a positive electrode coating; the area of ​​the positive electrode coating is smaller than the area of ​​the negative electrode coating.

[0026] In a preferred embodiment, the first end plate, the second end plate, the first current collector, the second current collector, the sealing ring, and the metal ring are all provided with a plurality of bolt holes adapted to the bolts. The plurality of bolt holes are evenly arranged circumferentially, and the bolts are fixed in the bolt holes. Insulating gaskets are provided between the bolts and the first end plate, and between the bolts and the second end plate. An insulating sleeve is fitted over the outside of the bolts.

[0027] In a preferred embodiment, when multiple battery cells are provided, adjacent battery cells are connected in series; two adjacent battery cells share one of the first current collectors or two adjacent battery cells share one of the second current collectors.

[0028] The beneficial effects achieved by this utility model are as follows: This application provides an explosion-proof injection hole on the metal ring seal, achieving both injection and explosion-proof functions through the metal ring seal. This makes the structure of this application more compatible with the processes and functions of conventional lithium batteries, solving the injection process problem of bipolar cells and enhancing the explosion-proof safety performance of the cells. Furthermore, by using a metal ring seal, the material used for the seal can be reduced; the price of the metal ring is far lower than that of a fluororubber seal, achieving effective cost reduction. This application has a simple structure, is easy to install, and is reliable and stable during use, possessing high practicality and economy, and can be produced and used as a general-purpose product. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of a liquid-fillable explosion-proof bipolar battery cell according to an embodiment of the present invention.

[0031] Figure 2 for Figure 1 A partial explosion structure diagram of a liquid-fillable, explosion-proof bipolar battery cell;

[0032] Figure 3 for Figure 2 A schematic diagram of the overall structure of the metal ring seal;

[0033] Figure 4 for Figure 3 A partial cross-sectional structural diagram of the metal ring seal;

[0034] Figure 5 for Figure 3 A schematic diagram of the structure of a metal ring;

[0035] Figure 6 for Figure 3 A schematic diagram of the sealing ring structure;

[0036] Figure 7 for Figure 3 A schematic diagram of the structure of an explosion-proof nut.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, top, bottom, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0042] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0043] Specifically, such as Figures 1 to 5As shown, the present invention proposes the following technical solution: a liquid-fillable explosion-proof bipolar battery cell structure, comprising a first end plate 10, at least one battery cell unit 20 and a second end plate 30, wherein the battery cell unit 20 is disposed between the first end plate 10 and the second end plate 30;

[0044] Each battery cell unit 20 includes a first current collector 21, a core 22, a metal ring sealing ring 23, and a second current collector 24. The first current collector 21, the metal ring sealing ring 23, and the second current collector 24 are stacked sequentially to form a sealed cavity (not shown in the figure). The metal ring sealing ring 23 is sleeved on the outside of the core 22, and the core 22 abuts against the first current collector 21 and the second current collector 24 respectively.

[0045] The metal ring sealing ring 23 is provided with at least one explosion-proof injection hole 231, and the explosion-proof injection hole 231 is connected to the sealing cavity.

[0046] For a preferred embodiment, please refer to Figures 3 to 5 The metal ring sealing ring 23 includes a metal ring 232 and a sealing ring 233, with the metal ring 232 being fitted into the sealing ring 233; the explosion-proof injection hole 231 is disposed inside the metal ring 232, and the explosion-proof injection hole 231 extends from one side of the metal ring 232 to the other side of the metal ring 232.

[0047] In a preferred embodiment, a through-hole screw 40 is provided in the explosion-proof injection hole 231; the end of the through-hole screw 40 near the core 22 is connected to the sealing cavity, and the end of the through-hole screw 40 away from the core 22 is provided with an explosion-proof nut 50.

[0048] In a preferred embodiment, a sealing washer 60 is provided at one end of the through-hole screw 40 near the explosion-proof nut 50; the sealing washer 60 is sleeved on the through-hole screw 40, and the sealing washer 60 abuts against the explosion-proof nut 50 and the metal ring 232 respectively.

[0049] In a preferred embodiment, the through-hole screw 40 is adapted to the explosion-proof injection hole 231; the through-hole screw 40 is adapted to the explosion-proof nut 50 and the sealing washer 60 respectively; and the metal ring 232 is adapted to the sealing ring 233.

[0050] As a preferred embodiment, such as Figure 6As shown, the sealing ring 233 is a U-shaped sealing ring; the opening of the U-shaped sealing ring faces the explosion-proof nut 50; the U-shaped sealing ring has a first groove 2331 that matches the through-hole screw 40 on the side near the core 22.

[0051] In a preferred embodiment, the first groove 2331 is provided to surround the through-hole screw 40, and the first groove 2331 is adapted to the through-hole screw 40.

[0052] As a preferred embodiment, such as Figure 5 As shown, the metal ring 232 is provided with a second groove 2321 that is adapted to the first groove 2331. The second groove 2321 is adapted to the first groove 2331 and the through-hole screw 40 respectively. The first groove 2331 covers the outside of the second groove 2321. The through-hole screw 40 passes through the second groove 2321 and the first groove 2331 in sequence and communicates with the sealed chamber.

[0053] In a preferred embodiment, the metal ring 232 is further provided with a third groove 2322, and the explosion-proof nut 50 and the sealing washer 60 are both accommodated in the third groove 2322, and the explosion-proof nut 50 and the sealing washer 60 are respectively adapted to the third groove 2322.

[0054] In a preferred embodiment, the explosion-proof nut 50 and the through-hole screw 40 are connected by threads.

[0055] As a preferred embodiment, such as Figure 7 As shown, the explosion-proof nut 50 is provided with a polygonal groove 51; the bottom of the polygonal groove 51 is provided with explosion-proof grooves 52.

[0056] In a preferred embodiment, the polygonal groove 51 is one of a hexagonal groove, a pentagonal groove, or a square groove. Specifically, in this embodiment, the polygonal groove 51 is a hexagonal groove.

[0057] The explosion-proof nut has a hexagonal groove for easy tightening with a hexagonal tool. At the same time, the bottom of the groove is engraved with explosion-proof marks, making it the weakest point in each cavity. When the battery cell generates a large amount of gas, the gas is released by breaking through the explosion-proof marks on the explosion-proof nut through the through hole of the through-hole screw, thus achieving the explosion-proof function.

[0058] In a preferred embodiment, the metal ring 232 has raised ribs 2323 on its side surface, the raised ribs 2323 being circumferentially arranged on the side surface of the metal ring 232; the metal ring 232 is an aluminum ring or a stainless steel ring. In this embodiment, two raised ribs 2323 are provided, and the metal ring 232 is an aluminum ring. By providing raised ribs 2323, the sealing pressure between the metal ring and the sealing ring is increased, resulting in a stronger seal.

[0059] As a preferred embodiment, such as Figure 2 As shown, the core 22 includes an insulating ring 221, a first electrode 222, a second electrode 223, and a diaphragm 224; the insulating ring 221 is sleeved on the outside of the diaphragm 224, the first electrode 222 abuts against one side of the diaphragm 224, and the second electrode 223 abuts against the other side of the diaphragm 224; the insulating ring 221 is sleeved on the outside of the first electrode 222 and the second electrode 223; the insulating ring 221 abuts against the sealing ring 233.

[0060] The first electrode 222 is disposed in contact with the first current collector 21, and the second electrode 223 is disposed in contact with the second current collector 24.

[0061] In a preferred embodiment, the insulating ring 221 is provided with a circular hole 2211 communicating with the through-hole screw 40; both sides of the insulating ring 221 are provided with a fourth groove 2212 communicating with the circular hole 2211; each of the fourth grooves 2212 is provided with a plurality of notches 2213 on the side away from the sealing ring 233; the plurality of notches 2213 are arranged at equal intervals.

[0062] In a preferred embodiment, the first electrode 222 is a positive electrode and the second electrode 223 is a negative electrode; or, the first electrode 222 is a negative electrode and the second electrode 223 is a positive electrode.

[0063] In a preferred embodiment, the first current collector 21 abuts against the first end plate 10, and the second current collector 24 abuts against the second end plate 30; one side of the first current collector 21 is coated with a first coating (not shown in the figure), and the other side is coated with a second coating (not shown in the figure); one side of the second current collector 24 is coated with a first coating (not shown in the figure), and the other side is coated with a second coating (not shown in the figure).

[0064] In a preferred embodiment, the first coating is a positive electrode coating and the second coating is a negative electrode coating; or, the first coating is a negative electrode coating and the second coating is a positive electrode coating; the area of ​​the positive electrode coating is smaller than the area of ​​the negative electrode coating. This ensures that the positive electrode is completely covered by the negative electrode.

[0065] In this embodiment of the application, when the first electrode is a positive electrode and the second electrode is a negative electrode, the coating of the first current collector near the first electrode is a negative electrode coating, and the coating of the first current collector near the first end plate is a positive electrode coating; the coating of the second current collector near the second electrode is a positive electrode coating, and the coating of the second current collector near the second end plate is a negative electrode coating.

[0066] When the first electrode is a negative electrode and the second electrode is a positive electrode, the coating of the first current collector near the first electrode is a positive electrode coating, and the coating of the first current collector near the first end plate is a negative electrode coating; the coating of the second current collector near the second electrode is a negative electrode coating, and the coating of the second current collector near the second end plate is a positive electrode coating.

[0067] In a preferred embodiment, the first end plate 10, the second end plate 30, the first current collector 21, the second current collector 24, the sealing ring 233, and the metal ring 232 are each provided with a plurality of bolt holes A that are adapted to the bolt 70. The plurality of bolt holes A are evenly arranged circumferentially, and the bolt 70 is fixed in the bolt hole A. An insulating gasket 80 is provided between the bolt 70 and the first end plate 10 and between the bolt 70 and the second end plate 30. The outer side of the bolt 70 is sleeved on the insulating sleeve 71.

[0068] In a preferred embodiment, when multiple battery cells 20 are provided, adjacent battery cells 20 are connected in series; two adjacent battery cells 20 share one of the first current collectors 21 or two adjacent battery cells 20 share one of the second current collectors 24.

[0069] Two adjacent cell units 20 may be connected in series by sharing one of the first current collectors 21; or, two adjacent cell units 20 may be connected in series by sharing one of the second current collectors 24.

[0070] In this embodiment, four battery cells are connected in series. End plates at both ends press the sealing rings of each sealed cavity together to ensure the airtightness of each cavity. The two end plates are locked together with bolts and insulating gaskets. Insulating sleeves are fitted onto the sides of the bolts to prevent short circuits between the sealed cavities. A diaphragm separates the positive and negative electrodes and is fixed by an insulating ring to prevent diaphragm displacement that could lead to a short circuit. The bipolar battery cell structure in this application is cylindrical; in other embodiments, the battery cell structure can also be cuboid, cubic, or polygonal.

[0071] Before electrolyte injection, the explosion-proof nut and sealing ring are not installed after the cell structure is assembled. The through-hole screw is secured in the first groove of the sealing ring and the explosion-proof injection hole, while the first groove of the sealing ring is secured in the second groove of the metal ring, thus fixing the through-hole screw. Simultaneously, the metal ring is secured within the sealing ring, thus insulating the metal ring, the current collector, and the positive and negative electrodes within the internal cavity. During electrolyte injection, the electrolyte enters the cell through the through-hole screw and the round hole of the insulating ring. After the cell has solidified and the air is released, the sealing gasket is tightened and sealed by the internal thread of the explosion-proof nut and the external thread of the through-hole screw.

[0072] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0073] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0074] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A liquid-fillable, explosion-proof bipolar battery cell structure, characterized in that, It includes a first end plate, at least one battery cell unit, and a second end plate, wherein the battery cell unit is disposed between the first end plate and the second end plate; Each cell unit includes a first current collector, a core, a metal ring sealing ring, and a second current collector; the first current collector, the metal ring sealing ring, and the second current collector are stacked sequentially to form a sealed cavity, the metal ring sealing ring is sleeved on the outside of the core, and the core abuts against the first current collector and the second current collector respectively. The metal ring seal is provided with at least one explosion-proof injection hole, which is connected to the sealing cavity.

2. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 1, characterized in that, The metal ring sealing ring includes a metal ring and a sealing ring, with the metal ring being fitted into the sealing ring; the explosion-proof injection hole is disposed inside the metal ring, and the explosion-proof injection hole extends from one side of the metal ring to the other side of the metal ring.

3. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 2, characterized in that, A through-hole screw is provided inside the explosion-proof injection hole; the end of the through-hole screw near the core is connected to the sealing cavity, and an explosion-proof nut is provided at the end of the through-hole screw away from the core.

4. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 3, characterized in that, A sealing washer is provided at one end of the through-hole screw near the explosion-proof nut; the sealing washer is fitted onto the through-hole screw, and the sealing washer abuts against the explosion-proof nut and the metal ring respectively.

5. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 4, characterized in that, The sealing ring is a U-shaped sealing ring; the opening of the U-shaped sealing ring faces the explosion-proof nut; the U-shaped sealing ring has a first groove on the side near the core that matches the through-hole screw.

6. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 5, characterized in that, The first groove surrounds the through-hole screw, and the first groove is adapted to fit the through-hole screw; The metal ring is provided with a second groove that matches the first groove. The second groove is adapted to the first groove and the through-hole screw respectively. The first groove covers the outside of the second groove. The through-hole screw passes through the second groove and the first groove in sequence and is connected to the sealing cavity.

7. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 6, characterized in that, The metal ring is also provided with a third groove, and the explosion-proof nut and the sealing washer are both housed in the third groove, and the explosion-proof nut and the sealing washer are respectively adapted to the third groove.

8. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 3, characterized in that, The explosion-proof nut is connected to the through-hole screw by a thread; The explosion-proof nut is provided with polygonal grooves; the bottom of the polygonal grooves is provided with explosion-proof markings.

9. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 2, characterized in that, The metal ring has raised ribs on its side surface, and the raised ribs are circumferentially arranged on the side surface of the metal ring; the metal ring is an aluminum ring or a stainless steel ring.

10. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 2, characterized in that, The core includes an insulating ring, a first electrode, a second electrode, and a diaphragm; the insulating ring is sleeved on the outside of the diaphragm, the first electrode abuts against one side of the diaphragm, and the second electrode abuts against the other side of the diaphragm; the insulating ring is sleeved on the outside of the first electrode and the second electrode; the insulating ring abuts against the sealing ring; The first electrode is disposed in contact with the first current collector, and the second electrode is disposed in contact with the second current collector.

11. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 10, characterized in that, The insulating ring has a circular hole that communicates with the through-hole screw; both sides of the insulating ring have a fourth groove that communicates with the circular hole; each fourth groove has multiple notches on the side away from the sealing ring; the multiple notches are evenly spaced.

12. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 10, characterized in that, The first electrode is a positive electrode and the second electrode is a negative electrode; or, the first electrode is a negative electrode and the second electrode is a positive electrode. The first current collector abuts against the first end plate, and the second current collector abuts against the second end plate; one side of the first current collector is coated with a first coating, and the other side is coated with a second coating; one side of the second current collector is coated with a first coating, and the other side is coated with a second coating.

13. The liquid-fillable explosion-proof bipolar battery cell structure according to claim 12, characterized in that, The first coating is a positive electrode coating, and the second coating is a negative electrode coating; or, the first coating is a negative electrode coating, and the second coating is a positive electrode coating; the area of ​​the positive electrode coating is smaller than the area of ​​the negative electrode coating. The first end plate, the second end plate, the first current collector, the second current collector, the sealing ring, and the metal ring are all provided with a plurality of bolt holes adapted to the bolts. The plurality of bolt holes are evenly arranged circumferentially, and the bolts are fixed in the bolt holes. Insulating gaskets are provided between the bolts and the first end plate and between the bolts and the second end plate. An insulating sleeve is fitted over the outside of the bolts. When there are multiple battery cells, adjacent battery cells are connected in series; two adjacent battery cells share one of the first current collectors or two adjacent battery cells share one of the second current collectors.

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