Bipolar battery, bipolar battery liquid injection structure, battery pack and electric device

Abstract

The utility model discloses a bipolarity battery, bipolarity battery liquid injection structure, battery package and electrical equipment, the bipolarity battery includes: a plurality of pole pieces and sealing rubber ring, a plurality of pole pieces along the first direction stack setting, be equipped with between any adjacent pole piece sealing rubber ring, sealing rubber ring is formed into closed loop and is limited between adjacent pole piece electrolyte cavity, every pole piece and corresponding sealing rubber ring fixed to make sealing rubber ring form heat pressure mark. Therefore, through adopting the sealing rubber ring of closed loop to the sealing of electrolyte cavity can guarantee the sealing performance of electrolyte cavity, is favorable to reducing the probability of bipolarity battery liquid leakage, has improved the reliability of bipolarity battery.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a bipolar battery, a bipolar battery electrolyte filling structure, a battery pack, and electrical equipment. Background Technology

[0002] In related technologies, bipolar battery packs are thinner and have a larger area. The gaps between adjacent electrodes in the battery pack are often narrow and long, making it difficult for sealant to effectively seal the gaps. As a result, the battery pack is prone to leakage, and there is room for improvement. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a bipolar battery that can ensure the sealing performance of the electrolyte chamber, thereby reducing the probability of leakage in the bipolar battery.

[0004] A bipolar battery according to an embodiment of the present invention includes: a plurality of electrode sheets stacked along a first direction; a sealing ring provided between any adjacent electrode sheets, the sealing ring being formed in a closed loop to define an electrolyte cavity between adjacent electrode sheets, and each electrode sheet and the corresponding sealing ring being fixed so that the sealing ring has a thermal indentation.

[0005] According to the embodiments of the present invention, the bipolar battery uses a closed-loop sealing ring to seal the electrolyte chamber, which can ensure the sealing performance of the electrolyte chamber, reduce the probability of leakage of the bipolar battery, and improve the reliability of the bipolar battery.

[0006] According to some embodiments of the present invention, in the bipolar battery, the minimum distance between the thermal indentation and the edge of the electrode is not less than 2 mm.

[0007] According to some embodiments of the present invention, the bipolar battery includes a first hot indentation spaced apart along a second direction and a second hot indentation spaced apart along a third direction. Adjacent first hot indentations and second hot indentations intersect each other. The first direction is perpendicular to the second direction and the third direction, respectively. The second direction is perpendicular to the third direction.

[0008] According to some embodiments of the present invention, in a bipolar battery, the portion of the sealing ring that overlaps with the heat indentation has a pore closure mark.

[0009] According to some embodiments of the present invention, the bipolar battery has multiple pore closure marks, which are spaced apart on the same side of the bipolar battery.

[0010] According to some embodiments of the present invention, in a bipolar battery, one of the electrode plates is provided with a first tab, and the other electrode plate is provided with a second tab. The portions of the first tab, the second tab, and the sealing ring with the pore closure marks are respectively located on different sides of the bipolar battery.

[0011] According to some embodiments of the present invention, in a bipolar battery, the outer edge of the sealing ring protrudes beyond the edge of the electrode sheet.

[0012] According to some embodiments of the present invention, in a bipolar battery, the sealing ring protrudes 1mm-2mm from the edge of the electrode.

[0013] This invention also proposes a bipolar battery electrolyte filling structure.

[0014] The bipolar battery electrolyte filling structure according to an embodiment of the present invention includes: a bipolar battery, the bipolar battery including a plurality of electrodes and a sealing ring, the plurality of electrodes being stacked along a first direction, the sealing ring being provided between any adjacent electrodes, the sealing ring being formed in a closed loop to define an electrolyte cavity between adjacent electrodes, the sealing ring having an filling side and a sealing side, the sealing side being sealed to the electrodes, and the filling side having a mounting hole; and an electrolyte filling component, the electrolyte filling component being inserted into the mounting hole to be detachably connected to the sealing ring, the electrolyte filling component having an electrolyte filling channel communicating with the electrolyte cavity.

[0015] According to the bipolar battery electrolyte filling structure of this utility model embodiment, by inserting the electrolyte filling component through the mounting hole to be detachably connected with the sealing ring, after the electrolyte filling is completed, the electrolyte filling component can be pulled out of the mounting hole and the sealing ring and the electrode are sealed and connected by hot pressing. This simplifies the electrolyte filling process, enables easy processing of bipolar batteries, and ensures the sealing effect of the sealing ring on the electrolyte cavity, thereby improving the reliability of the bipolar battery.

[0016] According to some embodiments of the present invention, in the bipolar battery electrolyte filling structure, the mounting hole penetrates the sealing ring along the first direction.

[0017] According to some embodiments of the present invention, in the bipolar battery liquid injection structure, there are multiple sealing rings, and the liquid injection side of the multiple sealing rings is located on the same side of the bipolar battery.

[0018] According to some embodiments of the present invention, in the bipolar battery liquid injection structure, the mounting holes of the plurality of sealing rings are spaced apart along the circumference of the bipolar battery.

[0019] According to some embodiments of the present invention, the liquid injection structure of a bipolar battery includes a tube body, which is inserted into the mounting hole and forms the liquid injection channel. The minimum distance between adjacent mounting holes is greater than or equal to the diameter of the tube body.

[0020] According to some embodiments of the bipolar battery electrolyte filling structure of this utility model, the minimum distance between the mounting hole and the edge of the electrode is L, which satisfies: 3mm≤L≤6mm.

[0021] According to some embodiments of the present invention, the liquid injection structure of a bipolar battery includes a tube body and a limiting part. The tube body passes through the mounting hole and forms the liquid injection channel. The limiting part protrudes from the outer peripheral wall of the tube body and is used for positioning and cooperating with the electrode.

[0022] According to some embodiments of the present invention, in the bipolar battery electrolyte filling structure, the tube body includes an inserted section and an extended section connected together, the limiting section is located between the inserted section and the extended section, the inserted section passes through the mounting hole and its end extends into the electrolyte cavity, and the extended section is located on the outside of the electrode.

[0023] According to some embodiments of the present invention, in the bipolar battery electrolyte filling structure, the end of the insertion section protrudes from the inner wall of the sealing ring.

[0024] According to some embodiments of the present invention, in the bipolar battery electrolyte filling structure, the size of the insertion section protruding from the inner wall of the sealing ring ranges from 2mm to 3mm.

[0025] According to some embodiments of the bipolar battery electrolyte filling structure of this utility model, a protective mesh is provided at one end of the tube body that communicates with the electrolyte chamber.

[0026] According to some embodiments of the bipolar battery liquid injection structure of this utility model, the diameter of the tube body is 1mm-3mm.

[0027] This utility model also proposes a battery pack.

[0028] The battery pack according to an embodiment of the present invention includes a bipolar battery as described in any of the above embodiments.

[0029] According to the battery pack of this utility model embodiment, the bipolar battery has a low probability of leakage and high reliability, which helps to improve the safety of the battery pack.

[0030] This utility model also proposes an electrical device.

[0031] The electrical device according to the embodiments of the present invention includes a bipolar battery according to any of the above embodiments; or a battery pack according to any of the above embodiments.

[0032] According to the embodiments of this utility model, the bipolar battery of the electrical equipment has a low probability of leakage and high reliability, which helps to improve the safety of the battery pack and improve the overall performance of the electrical equipment.

[0033] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0034] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0035] Figure 1 This is a schematic diagram of a bipolar battery according to an embodiment of the present utility model;

[0036] Figure 2 This is a schematic diagram of the hot indentation according to an embodiment of the present utility model;

[0037] Figure 3 This is a schematic diagram of the liquid injection structure of a bipolar battery according to an embodiment of the present invention;

[0038] Figure 4 This is an installation diagram of the bipolar battery liquid injection structure and liquid injection machine according to an embodiment of the present utility model;

[0039] Figure 5 This is an installation diagram of the injection component and sealing ring according to an embodiment of the present utility model;

[0040] Figure 6 This is a schematic diagram of the liquid injection component according to an embodiment of the present utility model;

[0041] Figure 7 This is a schematic diagram of a protective mesh according to an embodiment of the present invention.

[0042] Figure label:

[0043] Bipolar battery electrolyte filling structure 100, first direction F1, second direction F2, third direction F3,

[0044] Bipolar battery 1, electrode 11, first tab 111, second tab 112.

[0045] Sealing ring 12, injection side 121, sealing side 122, heat indentation 123, first heat indentation 1231, second heat indentation 1232, mounting hole 134.

[0046] Liquid injection component 2, tube body 21, insertion section 211, extension section 212, limiting part 22, protective mesh 23.

[0047] Injection machine 200, connector 201. Detailed Implementation

[0048] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0049] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] Hereinafter, with reference to the accompanying drawings, a bipolar battery 1 according to an embodiment of the present invention will be described.

[0052] like Figures 1-7As shown, the bipolar battery 1 according to an embodiment of the present invention includes: a plurality of electrode sheets 11 and a sealing ring 12. The plurality of electrode sheets 11 are stacked along a first direction F1. A sealing ring 12 is provided between any adjacent electrode sheets 11. The sealing ring 12 is formed in a closed loop shape to define an electrolyte cavity between adjacent electrode sheets 11. Each electrode sheet 11 and the corresponding sealing ring 12 are fixed so that the sealing ring 12 has a thermal indentation 123. This improves the sealing performance of the electrolyte cavity, reduces the probability of leakage of the bipolar battery 1, and improves the reliability of the bipolar battery 1.

[0053] First, such as Figures 1-2 As shown, the bipolar battery 1 includes multiple electrode sheets 11 and sealing rings 12. The multiple electrode sheets 11 are stacked along the first direction F1. The positive active layer and the negative active layer are respectively coated on the side of two adjacent electrode sheets 11 facing each other. The positive active layer and the negative active layer are separated by a separator.

[0054] A sealing ring 12 is provided between any two adjacent electrodes 11. The sealing ring 12 is formed into a closed loop and is fitted onto the outside of the separator. The sealing ring 12 defines an electrolyte chamber between adjacent electrodes 11, which stores electrolyte so that two adjacent electrodes 11 can be combined to form a battery cell. The electrodes 11 can be heat-pressed to the sealing ring 12 to form a heat indentation 123 on the sealing ring 12. The sealing ring 12 and the electrodes 11 are adapted to be sealed together at the heat indentation 123. Thus, the electrolyte chamber can be effectively sealed, improving the reliability of the bipolar battery 1.

[0055] According to the embodiment of the present invention, the bipolar battery 1 uses a closed-loop sealing ring 12 to seal the electrolyte chamber, which can ensure the sealing performance of the electrolyte chamber, reduce the probability of leakage of the bipolar battery 1, and improve the reliability of the bipolar battery 1.

[0056] In some embodiments of this utility model, the minimum distance between the hot indentation 123 and the edge of the electrode 11 can be set to be no less than 2mm, such as 2.5mm, 3mm, etc. This allows the hot indentation 123 to completely overlap with the electrode 11, which helps improve the forming quality of the hot indentation 123, ensures the connection stability between the electrode 11 and the sealing ring 12, and improves the sealing performance of the electrolyte chamber.

[0057] In some embodiments of this utility model, the heat indentation 123 includes a first heat indentation 1231 spaced apart along the second direction F2 and a second heat indentation 1232 spaced apart along the third direction F3. Adjacent first heat indentations 1231 and second heat indentations 1232 are intersected. The first direction F1 is perpendicular to the second direction F2 and the third direction F3 respectively. The second direction F2 and the third direction F3 are perpendicular to each other.

[0058] For example, refer to Figure 2 As shown, the thermal indentation 123 includes a first thermal indentation 1231 and a second thermal indentation 1232. Two first thermal indentations 1231 can be provided, spaced apart along a second direction F2, on both sides of the electrode 11 along the second direction F2. Similarly, two second thermal indentations 1232 can be provided, spaced apart along a third direction F3, on both sides of the electrode 11 along the third direction F3. Adjacent first and second thermal indentations 1231 and 1232 intersect, allowing them to surround the electrolyte cavity for a complete seal. It should be noted that the first direction F1 can be perpendicular to both the second direction F2 and the third direction F3, and the second direction F2 and the third direction F3 can also be perpendicular. This ensures the sealing effect of the electrolyte cavity and improves the reliability of the bipolar battery 1.

[0059] In some embodiments of this utility model, the portion where the sealing ring 12 overlaps with the heat indentation 123 has a pore closure mark. Specifically, as shown... Figures 3-5 As shown, the injection side 121 of the sealing ring 12 is provided with an installation hole 134. The injection component 2 passes through the installation hole 134 to be detachably connected to the sealing ring 12. The injection component 2 is connected to the electrolyte chamber. The injection machine 200 can introduce electrolyte into the electrolyte chamber through the injection component 2. After the injection is completed, the injection component 2 can be pulled out of the installation hole 134. Then, the injection side 121 of the sealing ring 12 is sealed and connected to the electrode 11 by hot pressing. The installation hole 134 is closed. After the installation hole 134 is closed, the sealing ring 12 forms a pore closure mark.

[0060] The above settings can reduce the processing difficulty of the bipolar battery 1 and ensure the sealing performance of the electrolyte chamber, thereby improving the practicality of the bipolar battery 1.

[0061] In some embodiments of this utility model, there are multiple pore closure marks, and these multiple pore closure marks are spaced apart on the same side of the bipolar battery 1. Specifically, as shown... Figures 3-5 As shown, there are multiple sealing rings 12, which are used to define multiple electrolyte chambers with adjacent electrode sheets 11. Each sealing ring 12 has a mounting hole 134. Multiple liquid injection components 2 correspond one-to-one with the multiple mounting holes 134, so that the multiple liquid injection components 2 can communicate with the corresponding electrolyte chambers. The multiple mounting holes 134 are located on the same side of the bipolar battery 1 and are spaced apart. After hot pressing, the multiple mounting holes 134 are closed, and the multiple sealing rings 12 respectively form pore closure marks. The multiple pore closure marks are spaced apart on the same side of the bipolar battery 1.

[0062] With the above configuration, the liquid injection machine 200 can be connected to multiple liquid injection components 2 at the same time to simultaneously introduce electrolyte into multiple electrolyte chambers, which is beneficial to improve the processing efficiency of the bipolar battery 1. Moreover, the multiple liquid injection components 2 do not interfere with each other, which can improve the molding quality of the bipolar battery 1.

[0063] In some embodiments of this utility model, such as Figures 3-5 As shown, one electrode 11 has a first tab 111, and the other electrode 11 has a second tab 112. The portions of the first tab 111, the second tab 112, and the sealing ring 12 with pore closure marks are located on different sides of the bipolar battery 1. It should be noted that one of the first tab 111 and the second tab 112 is a positive tab, and the other is a negative tab.

[0064] For example, the electrode 11 located on one side of the first direction F1 can have a first tab 111, and the electrode 11 located on the other side of the first direction F1 can have a second tab 112. The first tab 111 and the second tab 112 are located on both sides of the bipolar battery 1 along the second direction F2, and the portion of the sealing ring 12 with the pore closure mark (i.e., the liquid injection side 121 of the sealing ring 12) is located on one side of the bipolar battery 1 along the third direction F3. The first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other. Alternatively, the electrode 11 located on the first direction F1 can be configured to have a first tab 111, and the electrode 11 located on the other side of the first direction F1 can have a second tab 112. The electrode 11 on one side of F1 has a first tab 111, and the electrode 11 on the other side of the first direction F1 has a second tab 112. The first tab 111 is located on one side of the bipolar battery 1 along the second direction F2, and the second tab 112 is located on one side of the bipolar battery 1 along the third direction F3. The part of the sealing ring 12 with the pore closure mark (i.e., the liquid injection side 121 of the sealing ring 12) is located on the other side of the bipolar battery 1 along the second direction F2 (or the third direction F3). The first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other.

[0065] The above settings can prevent the first tab 111 and the second tab 112 from short-circuiting and avoid interference with the liquid injection process, thus improving the design rationality of the bipolar battery 1.

[0066] In some embodiments of this utility model, such as Figure 1 As shown, the outer edge of the sealing ring 12 can be set to protrude beyond the edge of the electrode 11. This allows the sealing ring 12 to fully seal the gap between adjacent electrodes 11, thereby improving the sealing performance of the electrolyte chamber.

[0067] In some embodiments of this utility model, the sealing ring 12 can be set to protrude 1mm-2mm from the edge of the electrode 11, such as 1mm, 1.2mm, 1.5mm, 1.7mm, 2mm, etc. This setting ensures the sealing effect of the sealing ring 12 and prevents the sealing ring 12 from being too large, which would affect the assembly of the bipolar battery 1, thus improving the design rationality of the bipolar battery 1.

[0068] This utility model also proposes a bipolar battery liquid injection structure 100.

[0069] like Figures 1-7 As shown, the bipolar battery electrolyte filling structure 100 according to an embodiment of the present invention includes: a bipolar battery 1 and an electrolyte filling component 2. The bipolar battery 1 includes a plurality of electrode sheets 11 and a sealing ring 12. The plurality of electrode sheets 11 are stacked along a first direction F1. A sealing ring 12 is provided between any adjacent electrode sheets 11. The sealing ring 12 is formed in a closed loop to define an electrolyte cavity between adjacent electrode sheets 11. The sealing ring 12 has an electrolyte filling side 121 and a sealing side 122. The sealing side 122 is sealed and connected to the electrode sheet 11. The electrolyte filling side 121 is provided with a mounting hole 134. The electrolyte filling component 2 passes through the mounting hole 134 to be detachably connected to the sealing ring 12. The electrolyte filling component 2 has an electrolyte filling channel communicating with the electrolyte cavity.

[0070] First, such as Figures 1-5 As shown, the bipolar battery liquid injection structure 100 includes a bipolar battery 1 and a liquid injection component 2. The bipolar battery 1 includes a plurality of electrode sheets 11 and a sealing ring 12. The plurality of electrode sheets 11 are stacked along a first direction F1. A positive active layer and a negative active layer are respectively coated on the side of two adjacent electrode sheets 11 facing each other. The positive active layer and the negative active layer are separated by a separator.

[0071] A sealing ring 12 is provided between any two adjacent electrode sheets 11. The sealing ring 12 is formed into a closed loop and is sleeved on the outside of the separator. The sealing ring 12 is used to define an electrolyte chamber between adjacent electrode sheets 11. The electrolyte chamber stores electrolyte so that two adjacent electrode sheets 11 can be combined to form a battery unit.

[0072] The sealing ring 12 has an injection side 121 and a sealing side 122. The sealing side 122 of the sealing ring 12 can be heat-pressed to seal the electrode 11 to seal the electrolyte chamber facing the sealing side 122. The injection side 121 of the sealing ring 12 is provided with a mounting hole 134. The injection component 2 is matched with the mounting hole 134 and is inserted into the mounting hole 134 to be detachably connected to the sealing ring 12. The injection component 2 has an injection channel, and the end of the injection component 2 can extend into the electrolyte chamber to communicate with the electrolyte chamber. The injection machine 200 can be connected to the injection component 2 through the insertion pipe 201 and introduce electrolyte into the electrolyte chamber through the injection channel.

[0073] In the specific processing, the liquid injection component 2 is first inserted into the mounting hole 134 to connect the liquid injection component 2 with the sealing ring 12. The sealing ring 12 with the liquid injection component 2 can be stacked with the electrode 11, and the sealing side 122 of the sealing ring 12 is sealed and connected to the electrode 11 by hot pressing. Then, the insertion pipe 201 of the liquid injection machine 200 can be inserted and connected to the liquid injection component 2 so that the liquid injection machine 200 can inject electrolyte into the electrolyte chamber through the liquid injection channel. After the liquid injection is completed, the liquid injection machine 200 can be removed from the liquid injection component 2, and the liquid injection component 2 can be pulled out of the mounting hole 134 to close the mounting hole 134. Finally, the liquid injection side 121 of the sealing ring 12 is sealed and connected to the electrode 11 by hot pressing, and the mounting hole 134 is closed. After the mounting hole 134 is closed, the sealing ring 12 forms a pore closure mark, thereby completing the processing of the bipolar battery 1.

[0074] It should be noted that the heat indentation 123 corresponding to the liquid injection side 121 of the sealing ring 12 can be either the second heat indentation 1232 or the first heat indentation 1231. This utility model does not limit this.

[0075] The above-mentioned configuration allows for simplified processing of the bipolar battery 1 and ensures the sealing effect of the sealing ring 12 on the electrolyte chamber, thereby improving the reliability of the bipolar battery 1.

[0076] According to the bipolar battery electrolyte filling structure 100 of this utility model embodiment, by passing the electrolyte filling component 2 through the mounting hole 134 to be detachably connected with the sealing ring 12, after the electrolyte filling is completed, the electrolyte filling component 2 can be pulled out of the mounting hole 134 and the sealing ring 12 and the electrode 11 can be sealed and connected by hot pressing. This simplifies the electrolyte filling process, enables the simple processing of the bipolar battery 1, and ensures the sealing effect of the sealing ring 12 on the electrolyte cavity, thereby improving the reliability of the bipolar battery 1.

[0077] In some embodiments of this utility model, such as Figure 5As shown, a mounting hole 134 can be provided to penetrate the sealing ring 12 along the first direction F1. The liquid injection component 2 can extend from one side of the sealing ring 12 to the other side along the first direction through the mounting hole 134, thereby being detachably connected to the sealing ring 12.

[0078] With the above settings, when the liquid injection component 2 is pulled out of the mounting hole 134, the gap size formed by the closing of the mounting hole 134 can be smaller, so that the sealing ring 12 has better sealing performance after hot pressing, thereby improving the reliability of the bipolar battery 1.

[0079] In some embodiments of this utility model, there are multiple sealing rings 12, and the liquid injection side 121 of the multiple sealing rings 12 is located on the same side of the bipolar battery 1.

[0080] For example, refer to Figures 3-5 As shown, there are multiple sealing rings 12, which define multiple electrolyte chambers with adjacent electrode sheets 11. Each sealing ring 12 has a liquid injection side 121, and multiple liquid injection components 2 correspond one-to-one with the liquid injection sides 121 of the multiple sealing rings 12, so that the multiple liquid injection components 2 can communicate with their respective electrolyte chambers. The liquid injection sides 121 of the multiple sealing rings 12 can be located on the same side of the bipolar battery 1, so that the multiple liquid injection components 2 can be located on the same side of the bipolar battery 1.

[0081] With the above settings, the liquid injection machine 200 can be connected to multiple liquid injection components 2 at the same time, so that the liquid injection machine 200 can simultaneously inject electrolyte into multiple electrolyte chambers, which can improve the processing efficiency of the bipolar battery 1 and reduce costs.

[0082] In some embodiments of this utility model, such as Figures 3-4 As shown, mounting holes 134 of multiple sealing rings 12 can be spaced apart circumferentially along the bipolar battery 1, so that multiple liquid injection components 2 can be arranged spaced apart circumferentially along the bipolar battery 1. This avoids the multiple liquid injection components 2 from stacking together along the first direction F1, thus preventing excessive local deformation of the bipolar battery 1 during the liquid injection process, improving the structural stability of the bipolar battery 1, and making it easier for the liquid injection machine 200 to connect with the liquid injection components 2, reducing the processing difficulty of the bipolar battery 1.

[0083] In some embodiments of this utility model, such as Figures 4-5As shown, the injection component 2 includes a tube body 21, which passes through a mounting hole 134 and forms an injection channel. The minimum distance between adjacent mounting holes 134 is greater than or equal to the diameter of the tube body 21. For example, the minimum distance between adjacent mounting holes 134 can be set to be equal to the diameter of the tube body 21; or, the minimum distance between adjacent mounting holes 134 can be set to 1.2 times the diameter of the tube body 21; or, the minimum distance between adjacent mounting holes 134 can be set to 1.5 times the diameter of the tube body 21.

[0084] The above settings allow for a suitable spacing between multiple liquid injection components 2, which helps reduce local deformation of the bipolar battery 1 during the liquid injection process and provides sufficient operating space so that the liquid injection machine 200 can be more easily connected to the liquid injection components 2, thus improving the practicality of the bipolar battery liquid injection structure 100.

[0085] In some embodiments of this utility model, such as Figures 3-5 As shown, one electrode 11 has a first tab 111, and the other electrode 11 has a second tab 112. The first tab 111, the second tab 112, and the liquid injection side 121 of the sealing ring 12 are located on different sides of the bipolar battery 1. It should be noted that one of the first tab 111 and the second tab 112 is a positive tab, and the other is a negative tab.

[0086] For example, the electrode 11 located on one side of the first direction F1 can have a first tab 111, and the electrode 11 located on the other side of the first direction F1 can have a second tab 112. The first tab 111 and the second tab 112 are located on both sides of the bipolar battery 1 along the second direction F2, and the liquid injection side 121 of the sealing ring 12 is located on one side of the bipolar battery 1 along the third direction F3. The first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other. Alternatively, the electrode 11 located on the first direction F1 can have a first tab 111. The electrode 11 on one side of F1 has a first tab 111, and the electrode 11 on the other side of the first direction F1 has a second tab 112. The first tab 111 is located on one side of the bipolar battery 1 along the second direction F2, and the second tab 112 is located on one side of the bipolar battery 1 along the third direction F3. The liquid injection side 121 of the sealing ring 12 is located on the other side of the bipolar battery 1 along the second direction F2 (or the third direction F3). The first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other.

[0087] The above settings can prevent the first tab 111 and the second tab 112 from short-circuiting and avoid interference with the liquid injection process, thus improving the design rationality of the bipolar battery 1.

[0088] In some embodiments of this utility model, such as Figure 5As shown, the minimum distance between the mounting hole 134 and the edge of the electrode 11 can be set to L, satisfying: 3mm≤L≤6mm. That is, the minimum distance L between the mounting hole 134 and the edge of the electrode 11 can be set to be greater than or equal to 3mm and less than or equal to 6mm, such as 3mm, 4mm, 5mm, 6mm, etc.

[0089] By adopting the above configuration, the impact of the mounting hole 134 on the structural stability of the sealing ring 12 can be reduced, thereby improving the sealing performance of the sealing ring 12. Furthermore, the mounting hole 134 can be positioned within the coverage area of ​​the heat indentation 123, allowing the sealing ring 12 to seal the mounting hole 134 after heat pressing, thus further improving the sealing performance of the sealing ring 12.

[0090] In some embodiments of this utility model, the liquid injection component 2 includes a tube body 21 and a limiting part 22. The tube body 21 passes through the mounting hole 134 and forms a liquid injection channel. The limiting part 22 protrudes from the outer peripheral wall of the tube body 21 and is used for positioning and cooperating with the electrode 11.

[0091] For example, refer to Figures 5-6 As shown, the liquid injection component 2 includes a tube body 21 and a limiting part 22. The tube body 21 can be constructed as a cylindrical tube. The tube body 21 is matched with the mounting hole 134 and is used to pass through the mounting hole 134 with its end extending into the electrolyte chamber. A liquid injection channel is formed inside the tube body 21, which communicates with the electrolyte chamber. The limiting part 22 is connected to the outer peripheral wall of the tube body 21 and protrudes outward. The limiting part 22 is used to limit and cooperate with the electrode 11 to achieve precise positioning between the liquid injection component 2 and the bipolar battery 1. Preferably, the limiting part 22 can be constructed as a ring.

[0092] The above settings ensure that the liquid injection component 2 is installed in place, so that the liquid injection component 2 can stably inject electrolyte into the electrolyte cavity, which is beneficial to improving the processing quality of the bipolar battery 1.

[0093] In some embodiments of this utility model, such as Figures 5-6 As shown, the tube body 21 includes an inserted section 211 and an extended section 212 connected together. A limiting part 22 is located between the inserted section 211 and the extended section 212. The inserted section 211 passes through the mounting hole 134 and its end extends into the electrolyte chamber. The extended section 212 is located outside the electrode 11 and is used to connect with the insertion tube 201 of the liquid injection machine 200 to achieve the connection between the liquid injection machine 200 and the liquid injection component 2. It should be noted that the diameter of the inserted section 211 and the diameter of the extended section 212 can be the same or different.

[0094] The above settings ensure the connection stability between the injection unit 2 and the injection machine 200, so that the injection machine 200 can inject electrolyte into the electrolyte chamber more stably, which is beneficial to improving the practicality of the bipolar battery injection structure 100.

[0095] In some embodiments of this utility model, such as Figure 5 As shown, the end of the insertion section 211 can be configured to protrude from the inner wall of the sealing ring 12. This prevents the end of the injection component 2 from contacting the sealing ring 12, which would cause electrolyte to flow into the gap between the sealing ring 12 and the electrode 11. This improves the thermal pressing quality of the injection side 121 of the sealing ring 12 and enhances the reliability of the bipolar battery 1.

[0096] In some embodiments of this utility model, the size of the inner wall of the insertion section 211 protruding from the sealing ring 12 can be set to be in the range of 2mm-3mm. That is, the size of the inner wall of the insertion section 211 protruding from the sealing ring 12 can be greater than or equal to 2mm and less than or equal to 3mm, such as 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, etc.

[0097] The above configuration can prevent the liquid injection component 2 from coming into contact with the separator, positive electrode active layer and negative electrode active layer, which is beneficial to improving the processing quality of the bipolar battery 1.

[0098] In some embodiments of this utility model, such as Figure 7 As shown, a protective mesh 23 can be provided at the end of the tube body 21 that communicates with the electrolyte chamber. The protective mesh 23 is used to buffer the electrolyte flowing into the electrolyte chamber. This can reduce the impact of the electrolyte on the active layer on the electrode 11, which is beneficial to improving the processing quality of the bipolar battery 1.

[0099] In some embodiments of this utility model, the diameter of the tube body 21 can be set to 1mm-3mm. That is, the diameter of the tube body 21 can be greater than or equal to 1mm and less than or equal to 3mm, such as 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc. Through the above settings, the injection efficiency of the injection component 2 can be guaranteed, and the size of the tube body 21 can be avoided from being too large, which would cause the size of the mounting hole 134 to be too large, thus ensuring the sealing performance of the sealing ring 12.

[0100] This utility model also proposes a battery pack.

[0101] The battery pack according to the present invention includes a bipolar battery 1 according to any of the above embodiments.

[0102] According to the battery pack of this utility model embodiment, the bipolar battery 1 has a low probability of leakage and high reliability, which helps to improve the safety of the battery pack.

[0103] This utility model also proposes an electrical device.

[0104] The electrical device according to the embodiments of this utility model includes a bipolar battery 1 according to any of the above embodiments or a battery pack according to any of the above embodiments. It should be noted that the electrical device can be a device for new energy vehicles, hybrid vehicles, etc.

[0105] According to the embodiments of the present invention, the bipolar battery 1 of the electrical equipment has a low probability of leakage and high reliability, which helps to improve the safety of the battery pack and enhance the overall performance of the electrical equipment.

[0106] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," 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, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0107] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A bipolar battery (1), characterized in that, include: Multiple electrodes (11) are stacked along a first direction (F1); A sealing ring (12) is provided between any adjacent electrode (11). The sealing ring (12) is formed in a closed loop shape to define an electrolyte cavity between adjacent electrode (11). Each electrode (11) and the corresponding sealing ring (12) are fixed so that the sealing ring (12) has a heat indentation (123).

2. The bipolar battery (1) according to claim 1, characterized in that, The minimum distance between the hot indentation (123) and the edge of the electrode (11) is not less than 2 mm.

3. The bipolar battery (1) according to claim 1, characterized in that, The heat indentation (123) includes a first heat indentation (1231) spaced apart along a second direction (F2) and a second heat indentation (1232) spaced apart along a third direction (F3). Adjacent first heat indentations (1231) and second heat indentations (1232) intersect each other. The first direction (F1) is perpendicular to the second direction (F2) and the third direction (F3) respectively. The second direction (F2) and the third direction (F3) are perpendicular to each other.

4. The bipolar battery (1) according to claim 1, characterized in that, The portion of the sealing ring (12) that overlaps with the heat indentation (123) has a pore closure mark.

5. The bipolar battery (1) according to claim 4, characterized in that, The pore closure marks are multiple, and the multiple pore closure marks are spaced apart on the same side of the bipolar battery (1).

6. The bipolar battery (1) according to claim 4, characterized in that, One of the electrode plates (11) is provided with a first tab (111), and the other electrode plate (11) is provided with a second tab (112). The portions of the first tab (111), the second tab (112), and the sealing ring (12) with the pore closure marks are respectively located on different sides of the bipolar battery (1).

7. The bipolar battery (1) according to any one of claims 1-6, characterized in that, The outer edge of the sealing ring (12) protrudes beyond the edge of the electrode (11).

8. The bipolar battery (1) according to claim 7, characterized in that, The sealing ring (12) protrudes 1mm-2mm from the edge of the electrode (11).

9. A bipolar battery liquid injection structure (100), characterized in that, include: A bipolar battery (1) includes a plurality of electrode sheets (11) and a sealing ring (12). The plurality of electrode sheets (11) are stacked along a first direction (F1). The sealing ring (12) is provided between any adjacent electrode sheets (11). The sealing ring (12) is formed in a closed loop to define an electrolyte cavity between adjacent electrode sheets (11). The sealing ring (12) has an injection side (121) and a sealing side (122). The sealing side (122) is sealed to the electrode sheet (11). The injection side (121) is provided with a mounting hole (134). The liquid injection component (2) is inserted into the mounting hole (134) and detachably connected to the sealing ring (12). The liquid injection component (2) has a liquid injection channel communicating with the electrolyte chamber.

10. The bipolar battery liquid injection structure (100) according to claim 9, characterized in that, The mounting hole (134) passes through the sealing ring (12) along the first direction (F1).

11. The bipolar battery liquid injection structure (100) according to claim 9, characterized in that, There are multiple sealing rings (12), and the liquid injection side (121) of the multiple sealing rings (12) is located on the same side of the bipolar battery (1).

12. The bipolar battery liquid injection structure (100) according to claim 11, characterized in that, The mounting holes (134) of the plurality of sealing rings (12) are spaced apart along the circumference of the bipolar battery (1).

13. The bipolar battery liquid injection structure (100) according to claim 12, characterized in that, The liquid injection component (2) includes a tube body (21), which passes through the mounting hole (134) and forms the liquid injection channel. The minimum distance between adjacent mounting holes (134) is greater than or equal to the diameter of the tube body (21).

14. The bipolar battery liquid injection structure (100) according to claim 9, characterized in that, The minimum distance between the mounting hole (134) and the edge of the electrode (11) is L, which satisfies: 3mm≤L≤6mm.

15. The bipolar battery liquid injection structure (100) according to any one of claims 9-14, characterized in that, The liquid injection component (2) includes a tube body (21) and a limiting part (22). The tube body (21) passes through the mounting hole (134) and forms the liquid injection channel. The limiting part (22) protrudes from the outer peripheral wall of the tube body (21) and is used for positioning and cooperating with the electrode (11).

16. The bipolar battery liquid injection structure (100) according to claim 15, characterized in that, The tube body (21) includes an inserted section (211) and an extended section (212) connected together. The limiting part (22) is located between the inserted section (211) and the extended section (212). The inserted section (211) passes through the mounting hole (134) and its end extends into the electrolyte chamber. The extended section (212) is located on the outside of the electrode (11).

17. The bipolar battery liquid injection structure (100) according to claim 16, characterized in that, The end of the insertion section (211) protrudes from the inner wall of the sealing ring (12).

18. The bipolar battery liquid injection structure (100) according to claim 17, characterized in that, The size of the insertion section (211) protruding from the inner wall of the sealing ring (12) ranges from 2mm to 3mm.

19. The bipolar battery liquid injection structure (100) according to claim 15, characterized in that, A protective mesh (23) is provided at one end of the tube body (21) that is connected to the electrolyte chamber.

20. The bipolar battery liquid injection structure (100) according to claim 15, characterized in that, The diameter of the tube body (21) is 1mm-3mm.

21. A battery pack, characterized in that, Includes the bipolar battery (1) according to any one of claims 1-8.

22. An electrical appliance, characterized in that, Includes the bipolar battery (1) according to any one of claims 1-8; or the battery pack according to claim 21.

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