Bipolar battery and method for manufacturing the same

Abstract

The present application relates to a bipolar battery and a manufacturing method thereof. The bipolar battery includes: a battery core having a first battery cell and a second battery cell connected to each other; a battery housing configured to wrap the battery core; and a first sealing wall formed within the battery housing and located between the first battery cell and the second battery cell; wherein the first sealing wall includes a colloid formed between the first battery cell and the second battery cell, a first elastic ring configured to be sleeved on the battery core and located between the first battery cell and the second battery cell, and a first skirt formed on the inner surface of the battery housing and extending around the first elastic ring. The bipolar battery can effectively achieve the sealing between battery cells.

Description

Technical Field

[0001] This application generally relates to the field of batteries, and particularly to a bipolar battery and a manufacturing method thereof. Background Art

[0002] In today's society, batteries have been widely used in various fields. Due to different application scenarios, there are various types of batteries. Among them, as a type of stack battery, the horizontal battery can usually be used as a high-capacity battery because it can contain multiple battery cells, and can be applied to starting of automobiles, ships, construction machinery, airplanes, locomotives, etc., and can also be used in various fields such as energy storage, backup power supplies, and forklifts.

[0003] In a stack battery, it usually includes multiple battery cells (also called battery units), and each battery cell includes a positive electrode plate, a negative electrode plate, and a separator located between the two. The same-polarity electrode plates in a cell (i.e., a battery cell) are connected in parallel, and the battery capacity is determined by the size of the electrode plates, the number of parallel connections, etc.; the positive and negative electrodes between adjacent battery cells are connected in series, and the total voltage of the battery is determined by the number of series-connected battery cells. The electrode plate is composed of a current collector and the active material located thereon. For example, the positive electrode plate is formed by coating the positive active material on the current collector, and the negative electrode plate is formed by coating the negative active material on the current collector.

[0004] For a stack battery, according to whether the positive and negative electrode plates share the current collector, it can be divided into a unipolar battery and a bipolar battery. In a unipolar battery, the current collectors of the positive and negative electrode plates are separated, that is, the current collectors of the positive and negative electrode plates are two separate components. The positive and negative electrode plates of one battery cell in a unipolar battery are isolated from those of another battery cell, and series connection must be achieved through additional welding, with a relatively complex process and poor reliability. In a bipolar battery, its positive and negative electrode plates share the same current collector, and the positive and negative electrode plates sharing the same current collector are respectively located in different battery cells. Therefore, it realizes the series connection between different battery cells by means of the current collector without the need for additional welding. Compared with a unipolar battery, the bipolar battery is more convenient and reliable for achieving series connection.

[0005] Currently, when manufacturing a battery, after installing the bipolar plate on the battery housing and covering the battery top cover, two sealing platforms of the bipolar plate are squeezed to form two sealing walls. The sealing walls are sealingly connected to the inner wall of the battery groove in the battery housing. A glue injection groove is formed between two adjacent sealing walls, and the glue injection groove communicates with the glue groove located between the battery top cover and the inner wall of the battery groove. Thus, resin glue can be injected through the glue groove to achieve the sealing between adjacent battery cells and prevent liquid leakage or gas leakage between adjacent battery cells. However, sometimes the method of achieving sealing in this way may not effectively achieve the sealing between adjacent battery cells, and sometimes three or more sealing platforms still need to be formed to more effectively ensure the complete sealing between adjacent battery cells. Summary of the Invention

[0006] One of the technical problems to be solved by the present application is to overcome the deficiencies in the above-mentioned prior art and provide at least one method for manufacturing a bipolar battery. This method is not only simple in process, high in efficiency, low in cost, and suitable for large-scale production, but also the bipolar battery manufactured according to this method can effectively achieve the sealing between adjacent battery cells of the battery core.

[0007] Some embodiments of the present application provide a bipolar battery, which includes: a battery core having at least one bipolar plate; a first elastic ring having a plurality of holes penetrating its body, which is disposed around the battery core and located between the positive plate and the negative plate of the bipolar plate; a battery groove configured to accommodate the battery core, wherein the inner surface of the battery groove has a first skirt, and the first skirt is configured to extend along the first elastic ring and engage the first elastic ring; and a battery cover configured to cooperate with the battery groove, wherein the inner surface of the battery cover has a second skirt, and the second skirt is configured to extend along the first elastic ring and engage the first elastic ring.

[0008] Some embodiments of the present application provide a bipolar battery, which includes: a battery core having a first battery cell and a second battery cell connected to each other; a battery housing configured to cover the battery core; and a first sealing wall formed in the battery housing and located between the first battery cell and the second battery cell; wherein the first sealing wall includes a colloid formed between the first battery cell and the second battery cell, a first elastic ring configured to be sleeved on the battery core and located between the first battery cell and the second battery cell, and a first skirt formed on the inner surface of the battery housing and extending around the first elastic ring.

[0009] Some embodiments of the present application provide a method for a bipolar battery. The manufacturing method includes: providing a battery core, the battery core including a first battery cell and a second battery cell connected to each other; sleeving an elastic ring around the connection between the first battery cell and the second battery cell of the battery core; placing the battery core into a battery case, wherein the elastic ring sleeved on the battery core cooperates with a first skirt formed on the inner surface of the battery case; and fitting a battery cover with the battery case to form a battery housing covering the battery core, wherein the elastic ring sleeved on the battery core cooperates with a second skirt formed on the inner surface of the battery cover, and wherein, when the battery cover and the battery case cooperate with each other, the first skirt of the battery case and the second skirt of the battery cover cooperate with each other to form an annular space together.

[0010] The foregoing summary of the invention and the following embodiments are not intended to limit the present application to any specific embodiment, but are only intended to describe some embodiments of the present application

[0011] The bipolar battery provided according to the present application can effectively achieve the seal between adjacent battery cells, thereby effectively preventing the phenomenon of liquid leakage or gas leakage between adjacent battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to better understand the essence of some embodiments of the present application and the technical problems to be solved, the following embodiments will be referred to in conjunction with the accompanying drawings. In the drawings, like reference numerals represent like components unless the context clearly dictates otherwise.

[0013] Figure 1 A perspective view of the battery core according to some embodiments of the present application;

[0014] Figure 2A A cross-sectional view of the battery core according to some embodiments of the present application;

[0015] Figure 2B A front view of each battery cell in the battery core according to some embodiments of the present application, which shows the connection relationship between the positive and negative single plates and three bipolar plates;

[0016] Figure 2C A top view of each battery cell in the battery core according to some embodiments of the present application;

[0017] Figure 3A A perspective view of sleeving an elastic ring around a battery core according to the method of some embodiments of the present application;

[0018] Figure 3B A side view of sleeving an elastic ring around a battery core according to the method of some embodiments of the present application;

[0019] Figure 3C Schematic cross-sectional view of an elastic loop sleeved on a battery core according to a method of some embodiments of the present application;

[0020] Figure 4 Schematic perspective view of an elastic loop of some embodiments of the present application;

[0021] Figure 5A Schematic perspective view of assembling a battery core, a battery case and a battery cover according to a method of some embodiments of the present application;

[0022] Figure 5B Schematic side view of assembling a battery core, a battery case and a battery cover according to a method of some embodiments of the present application;

[0023] Figure 5C Along Figure 5B Cross-sectional view taken along line A-A in ;

[0024] Figure 6A Schematic perspective view of a combination of a battery core, a battery case and a battery cover of some embodiments of the present application;

[0025] Figure 6B For the cross-sectional view taken along Figure 6A Line B-B in ;

[0026] Figure 6C For the cross-sectional view taken along Figure 6A Line C-C in ;

[0027] Figure 7 Schematic cross-sectional view of injecting resin glue into a battery case according to a method of some embodiments of the present application;

[0028] Figure 8 Schematic perspective view of combining a bus bar, an external terminal and a battery core according to a method of some embodiments of the present application;

[0029] Figure 9 Schematic perspective view of fitting a end cap, a glue hole cover, a battery case and a battery cover according to a method of some embodiments of the present application;

[0030] Figure 10 Schematic perspective view of fitting an acid inlet cover, a pressure relief valve and a pressure relief valve cover to an acid inlet and an acid outlet according to a method of some embodiments of the present application;

[0031] Figure 11A Schematic perspective view of a bipolar battery of some embodiments of the present application; and

[0032] Figure 11B Schematic cross-sectional view of a bipolar battery of some embodiments of the present application. Detailed Description of the Invention

[0033] The following disclosure provides many different embodiments or examples for implementing different features of the provided object. Specific examples of components and arrangements are described below. Of course, these are only examples and are not intended to be restrictive. In this application, references to the formation of a first feature on or over a second feature in the following description may include embodiments in which the first feature is formed in direct contact with the second feature, and may also include embodiments in which additional features may be formed between the first feature and the second feature such that the first feature and the second feature are not in direct contact. Additionally, this application may repeat reference numerals and / or letters in various instances. This repetition is for purposes of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or configurations discussed.

[0034] Embodiments of this application are discussed in detail below. However, it should be understood that this application provides many applicable concepts that can be implemented in a wide variety of specific situations. The specific embodiments discussed are merely illustrative and do not limit the scope of this application.

[0035] A bipolar battery needs to form a sealing structure between adjacent battery cells in its battery core to achieve sealing between adjacent battery cells and prevent liquid or gas leakage between adjacent battery cells. However, in the prior art, it is usually necessary to form multiple sealing structures to ensure complete sealing between adjacent battery cells.

[0036] The following describes a method for manufacturing the bipolar battery 1 of some embodiments of this application.

[0037] First, as Figure 1 shown, a battery core 10 is provided, and the battery core 10 has battery cells 11, 12, 13, 14 arranged in a row and connected to each other. That is, in this embodiment, there are four battery cells. Of course, the battery core 10 may also have other numbers of battery cells (such as two), and reference may be made to the content disclosed in the patent application No. CN202011195672.4.

[0038] Regarding the composition of the battery core 10, as Figure 2A shown, the battery core 10 has a plurality of stacked plates 15 (including bipolar plates, positive single plates, and negative single plates), and the plurality of stacked plates 15 are fixed by a cover plate 17 and a pressure frame 18. The detailed structure and manufacturing method of the battery core 10 can be found in the content disclosed in the patent application No. CN202011195672.4. The following will introduce the key points.

[0039] Since the battery cell 10 has a plurality of plates 15 (including bipolar plates, positive single plates, and negative single plates) stacked on each other, the battery monomers 11, 12, 13, and 14 also include these mutually stacked bipolar plates, positive single plates, and negative single plates at the same time. To more clearly understand the arrangement (stacking) of these bipolar plates and positive and negative single plates, reference can be made to Figure 2B , 2C ( Figure 2B , 2C Only a part of the plurality of plates 15 stacked on each other is shown as an example to illustrate the positional relationship between them). The positive single plate 151 and the negative plate 1512 of the bipolar plate 152 are included in the battery monomer 11 (a separator 150 is provided between the two, the same below); the positive plate 1521 of the bipolar plate 152 and the negative plate 1532 of the bipolar plate 153 are included in the battery monomer 12; the positive plate 1531 of the bipolar plate 153 and the negative plate 1542 of the bipolar plate 154 are included in the battery monomer 13; the positive plate 1541 of the bipolar plate 154 and the negative single plate 155 are included in the battery monomer 14.

[0040] From the above, it can be understood that each adjacent battery monomer will have at least one common bipolar plate. The positive and negative plate connection parts of the bipolar plate separate two adjacent battery monomers, and the adjacent battery monomers are electrically connected via the connection part. In some embodiments of the present application, the adjacent battery monomers 11 and 12 simultaneously have the bipolar plate 152. The connection part 1520 connecting the negative plate 1512 and the positive plate 1521 of the bipolar plate 152 is located between the adjacent battery monomers 11 and 12, and the adjacent battery monomers 11 and 12 are electrically connected to each other via the connection part 1520. In some embodiments of the present application, the adjacent battery monomers 12 and 13 simultaneously have the bipolar plate 153. The connection part 1530 connecting the negative plate 1532 and the positive plate 1531 of the bipolar plate 153 is located between the adjacent battery monomers 12 and 13, and the adjacent battery monomers 12 and 13 are electrically connected to each other via the connection part 1530. In some embodiments of the present application, the adjacent battery monomers 13 and 14 simultaneously have the bipolar plate 154. The connection part 1540 connecting the negative plate 1542 and the positive plate 1541 of the bipolar plate 154 is located between the adjacent battery monomers 13 and 14, and the adjacent battery monomers 13 and 14 are electrically connected to each other via the connection part 1540.

[0041] Refer again to Figure 2A, a plurality of electrode plates 15 stacked on each other in the battery cell 10 form battery monomers 11, 12, 13, 14 that are connected to each other. In some embodiments of the present application, a glue injection groove 111 is formed at one end adjacent to the battery monomer 11, a glue injection groove 112 is formed between the battery monomer 11 and the battery monomer 12, a glue injection groove 131 is formed between the battery monomer 13 and the battery monomer 14, and a glue injection groove 141 is formed at one end adjacent to the battery monomer 14; in some embodiments of the present application, the glue injection groove 111 is jointly formed by the ends of the single electrode plates and / or double electrode plates stacked on each other in the battery monomer 11, the glue injection groove 112 is jointly formed by the connecting portion of the double electrode plates jointly owned by the adjacent battery monomers 11, 12 and the ends of the single electrode plates stacked together, the glue injection groove 121 is jointly formed by the connecting portion of the double electrode plates jointly owned by the adjacent battery monomers 12, 13 and the ends of the single electrode plates stacked together, the glue injection groove 131 is jointly formed by the connecting portion of the double electrode plates jointly owned by the adjacent battery monomers 13, 14 and the ends of the single electrode plates stacked together, and the glue injection groove 141 is jointly formed by the ends of the single electrode plates and / or double electrode plates stacked on each other in the battery monomer 14. In some embodiments of the present application, one end of the battery monomer 11 has a wire 118 extending outward, and one end of the battery monomer 14 has a wire 148 extending outward.

[0042] As Figures 3A - 3C shown, elastic rings 21, 22, 23, 24, 25 are provided and sleeved on the battery cell 10; as Figure 4 shown, in some embodiments of the present application, the elastic rings 21, 22, 23, 24, 25 have holes 210, 220, 230, 240, 250 penetrating through their bodies; in some embodiments of the present application, the elastic rings 21, 22, 23, 24, 25 include rubber materials or foamed elastic materials.

[0043] Referring to Figure 3A and 3B 3C, the elastic ring 21 is sleeved on the battery cell 10 and adjacent to the end 110 of the battery monomer 11. In some embodiments of the present application, the elastic ring 21 can be generally aligned with the glue injection groove 111.

[0044] The elastic ring 22 is sleeved on the battery cell 10 and located between the adjacent battery monomers 11 and 12. In some embodiments of the present application, the elastic ring 22 can be generally aligned with the glue injection groove 112; furthermore, since the elastic ring 22 is sleeved on the battery cell 10 and located between the adjacent battery monomers 11 and 12, the elastic ring 22 is disposed around the connecting portion of the double electrode plates jointly owned by the adjacent battery monomers 11 and 12 (i.e., between the positive electrode plate and the negative electrode plate of the double electrode plate). In other words, the elastic ring 22 is generally located at the connection of the double electrode plates jointly owned by the adjacent battery monomers 11 and 12.

[0045] The elastic ring 23 is sleeved on the battery core 10 and is located between the adjacent battery cells 12 and 13. In some embodiments of the present application, the elastic ring 23 can be substantially aligned with the glue injection groove 121. Moreover, since the elastic ring 23 is sleeved on the battery core 10 and is located between the adjacent battery cells 12 and 13, the elastic ring 23 is disposed around the connecting portion of the bipolar plate shared by the adjacent battery cells 12 and 13 (i.e., between the positive plate and the negative plate of the bipolar plate). In other words, the elastic ring 23 is substantially located at the connection of the bipolar plate shared by the adjacent battery cells 12 and 13.

[0046] The elastic ring 24 is sleeved on the battery core 10 and is located between the adjacent battery cells 13 and 14. In some embodiments of the present application, the elastic ring 24 can be substantially aligned with the glue injection groove 131. Moreover, since the elastic ring 24 is sleeved on the battery core 10 and is located between the adjacent battery cells 13 and 14, the elastic ring 24 is disposed around the connecting portion of the bipolar plate shared by the adjacent battery cells 13 and 14 (i.e., between the positive plate and the negative plate of the bipolar plate). In other words, the elastic ring 24 is substantially located at the connection of the bipolar plate shared by the adjacent battery cells 13 and 14.

[0047] The elastic ring 25 is sleeved on the battery core 10 and is adjacent to the end portion 140 of the battery cell 14. In some embodiments of the present application, the elastic ring 25 can be substantially aligned with the glue injection groove 141.

[0048] Next, as shown in Figure 5A 、 5B 、5C, a battery slot 31 and a battery cover 32 are provided. Figure 6A 、 6B 、6C shows an embodiment in which the battery core 10 of the present application is placed in the battery slot 31 and the battery cover 32 is sealed. In some embodiments of the present application, the battery slot 31 and the battery cover 32 are part of the battery housing of the bipolar battery of the present application. The battery slot 31 is configured to accommodate the battery core 10 therein. In some embodiments of the present application, when the battery core 10 is accommodated in the battery slot 31, the two opposite side surfaces 101, 103 and the bottom surface 105 of the battery core 10 will be covered by the battery slot 31 (reference can be made to Figure 6C ).

[0049] The inner surface of the battery case 31 has a plurality of skirts 311, 313, 315, 317, and 319 that project and extend on the inner surface. When the battery cell 10 is received in the battery case 31, the skirts 311, 313, 315, 317, and 319 of the battery case 31 respectively substantially surround and are sleeved on the elastic rings 21, 22, 23, 24, and 25 of the battery cell 10, and cooperate with the elastic rings 21, 22, 23, 24, and 25 (reference can be made to Figure 6B , 6C ); in certain embodiments of the present application, the skirts 311, 313, 315, 317, and 319 are configured to engage the elastic rings 21, 22, 23, 24, and 25 on the battery cell 10; in certain embodiments of the present application, the skirts 311, 313, 315, 317, and 319 are configured to embed the elastic rings 21, 22, 23, 24, and 25 into the skirts 311, 313, 315, 317, and 319. Since the elastic rings 21, 22, 23, 24, and 25 are elastic, they can undergo elastic deformation when being embedded into the skirts 311, 313, 315, 317, and 319, thereby contributing to the formation of a good sealing structure.

[0050] In certain embodiments of the present application, the battery cover 32 is configured to cooperate with the battery case 31. In certain embodiments, the battery cover 32 can be pressed down to be combined with the battery case 31. In certain embodiments of the present application, the battery cover 32 can be heat-sealed and welded to the battery case 31. After the battery cover 32 cooperates with the battery case 31 that has received the battery cell 10, the top surface 107 of the battery cell 10 will be covered by the battery cover 32 (reference can be made to Figure 6C ).

[0051] The inner surface of the battery cover 32 has a plurality of skirts 321, 323, 325, 327, and 329 that project and extend on the inner surface. When the battery cover 32 cooperates with the battery case 31 that has received the battery cell 10, the skirts 321, 323, 325, 327, and 329 of the battery cover 32 respectively substantially surround and are sleeved on the elastic rings 21, 22, 23, 24, and 25 of the battery cell 10, and cooperate with the elastic rings 21, 22, 23, 24, and 25 (reference can be made to Figure 6B , 6C ); in certain embodiments of the present application, the skirts 321, 323, 325, 327, and 329 are configured to engage the elastic rings 21, 22, 23, 24, and 25 on the battery cell 10; in certain embodiments of the present application, the skirts 321, 323, 325, 327, and 329 are configured to embed the elastic rings 21, 22, 23, 24, and 25 into the skirts 321, 323, 325, 327, and 329.

[0052] In certain embodiments of the present application, each of the skirts 311, 313, 315, 317, and 319 of the battery case 31 has a U-shaped groove structure in cross-section, and each of the skirts 321, 323, 325, 327, and 329 of the battery cover 32 has a U-shaped groove structure in cross-section. When the battery cover 32 and the battery case 31 cooperate with each other, the skirts 311, 313, 315, 317, and 319 of the battery case 31 cooperate with the skirts 321, 323, 325, 327, and 329 of the battery cover 32 respectively, and the mutually cooperating upper and lower skirts 311, 313, 315, 317, and 319 and skirts 321, 323, 325, 327, and 329 can jointly form a plurality of annular spaces. As Figure 6C shown, the skirt 315 of the battery case 31 and the skirt 325 of the battery cover 32 cooperate with each other and jointly form an annular space.

[0053] The bottom surface 310 of the battery case 31 has a plurality of glue injection holes 3115, 3135, 3155, 3175, 3195 (reference can be made to Figure 5B , 5C ). In certain embodiments of the present application, the positions of the glue injection holes 3115, 3135, 3155, 3175, 3195 roughly align with the skirts 311, 313, 315, 317, 319 of the battery case 31 respectively. The battery cover 32 has a plurality of pairs of glue outlet holes 3215, 3235, 3255, 3275, 3295 (reference can be made to Figure 5A , 5B , 5C). In certain embodiments of the present application, the positions of the pairs of glue outlet holes 3215, 3235, 3255, 3275, 3295 roughly align with the skirts 311, 313, 315, 317, 319 of the battery case 31 respectively. Furthermore, as described above, the mutually cooperating upper and lower skirts 311, 313, 315, 317, and 319 and skirts 321, 323, 325, 327, and 329 can jointly form a plurality of annular spaces, and the glue injection holes 3115, 3135, 3155, 3175, 3195 and the pairs of glue outlet holes 3215, 3235, 3255, 3275, 3295 are configured to communicate with a plurality of annular spaces jointly formed by the skirts 311, 313, 315, 317, and 319 and the skirts 321, 323, 325, 327, and 329 respectively.

[0054] As Figure 6A , 6B shown, in certain embodiments of the present application, the battery case 31 has acid inlet ports 312, 314, 316, 318, and the battery cover 32 has acid outlet ports 322, 324, 326, 328.

[0055] As Figure 7As shown, resin glue is injected from the glue injection holes 3115, 3135, 3155, 3175, and 3195 of the battery case 31. In some embodiments of the present application, the resin glue is injected from the glue injection hole 3115 into the annular space jointly formed by the skirt 311 of the battery case 31 and the skirt 321 of the battery cover 32. The resin glue can enter the glue injection groove 111 adjacent to the end 110 of the battery cell 11 through the holes 210 in the elastic ring 21 that cooperates with the skirt 311 of the battery case 31 and the skirt 321 of the battery cover 32 (reference can be made to Figure 4 ). Further, the excess resin glue can overflow through the paired glue outlet holes 3215. Since the glue outlet holes 3215 are arranged in pairs, the injected resin glue can be evenly and quickly flowed into the annular space and / or the glue injection groove 111. After the glue injection is completed, the injected resin glue, the elastic ring 21, the skirt 311 of the battery case 31, and the skirt 321 of the battery cover 32 are configured to jointly form a sealing wall adjacent to the end 110 of the battery cell 11.

[0056] In some embodiments of the present application, the resin glue is injected from the glue injection hole 3135 into the annular space jointly formed by the skirt 313 of the battery case 31 and the skirt 323 of the battery cover 32. The resin glue can enter the glue injection groove 112 located between the battery cell 11 and the battery cell 12 through the holes 220 in the elastic ring 22 that cooperates with the skirt 313 of the battery case 31 and the skirt 323 of the battery cover 32 (reference can be made to Figure 4 ). Further, the excess resin glue can overflow through the paired glue outlet holes 3235. Since the glue outlet holes 3235 are arranged in pairs, the injected resin glue can be evenly and quickly flowed into the annular space and / or the glue injection groove 112. After the glue injection is completed, the injected resin glue, the elastic ring 22, the skirt 313 of the battery case 31, and the skirt 323 of the battery cover 32 are configured to jointly form a sealing wall located between the battery cell 11 and the battery cell 12.

[0057] In some embodiments of the present application, the resin glue is injected from the glue injection hole 3155 into the annular space jointly formed by the skirt 315 of the battery case 31 and the skirt 325 of the battery cover 32. The resin glue can enter the glue injection groove 111 adjacent to the end 110 of the battery cell 11 through the holes 210 in the elastic ring 21 that cooperates with the skirt 315 of the battery case 31 and the skirt 325 of the battery cover 32 (reference can be made to Figure 4)It enters the glue injection groove 121 located between the battery cells 12 and 13; further, the excess resin glue can overflow through the paired glue outlet holes 3255. Since the glue outlet holes 3255 are arranged in pairs, the injected resin glue can be evenly and quickly flowed into the annular space and / or the glue injection groove 121. After the glue injection is completed, the injected resin glue, the elastic ring 23, the skirt 315 of the battery case 31 and the skirt 325 of the battery cover 32 are configured to jointly form a sealing wall located between the battery cells 12 and 13.

[0058] In some embodiments of the present application, the resin glue is injected from the glue injection hole 3175 into the annular space jointly formed by the skirt 317 of the battery case 31 and the skirt 327 of the battery cover 32. The resin glue can pass through the hole 240 in the elastic ring 24 that cooperates with the skirt 317 of the battery case 31 and the skirt 327 of the battery cover 32 (for reference Figure 4 )It enters the glue injection groove 131 located between the battery cells 11 and 12; further, the excess resin glue can overflow through the paired glue outlet holes 3275. Since the glue outlet holes 3275 are arranged in pairs, the injected resin glue can be evenly and quickly flowed into the annular space and / or the glue injection groove 131. After the glue injection is completed, the injected resin glue, the elastic ring 24, the skirt 317 of the battery case 31 and the skirt 327 of the battery cover 32 are configured to jointly form a sealing wall located between the battery cells 13 and 11.

[0059] In some embodiments of the present application, the resin glue is injected from the glue injection hole 3195 into the annular space jointly formed by the skirt 319 of the battery case 31 and the skirt 329 of the battery cover 32. The resin glue can pass through the hole 250 in the elastic ring 25 that cooperates with the skirt 319 of the battery case 31 and the skirt 329 of the battery cover 32 (for reference Figure 4 )It enters the glue injection groove 141 adjacent to the end 140 of the battery cell 14; further, the excess resin glue can overflow through the paired glue outlet holes 3295. Since the glue outlet holes 3295 are arranged in pairs, the injected resin glue can be evenly and quickly flowed into the annular space and / or the glue injection groove 141. After the glue injection is completed, the injected resin glue, the elastic ring 25, the skirt 319 of the battery case 31 and the skirt 329 of the battery cover 32 are configured to jointly form a sealing wall adjacent to the end 140 of the battery cell 14.

[0060] The sealing walls adjacent to the end 110 of the battery cell 11 and the sealing wall located between the battery cell 11 and the battery cell 12, together with the battery case 31 and the battery cover 32, jointly form a sealed space containing the battery cell 11. The sealing wall located between the battery cell 11 and the battery cell 12 and the sealing wall located between the battery cell 12 and the battery cell 13, together with the battery case 31 and the battery cover 32, jointly form a sealed space containing the battery cell 12. The sealing wall located between the battery cell 12 and the battery cell 13 and the sealing wall located between the battery cell 13 and the battery cell 14, together with the battery case 31 and the battery cover 32, jointly form a sealed space containing the battery cell 13. The sealing wall located between the battery cell 13 and the battery cell 14 and the sealing wall adjacent to the end 140 of the battery cell 14, together with the battery case 31 and the battery cover 32, jointly form a sealed space containing the battery cell 14. These sealed spaces are not in fluid communication with each other due to the barrier of these sealing walls.

[0061] As Figure 8 shown, busbars 41, 45 and terminals 43, 47 are further provided. In some embodiments of the present application, the terminal 43 has an L-shaped structure 431. One end of the L-shaped structure 431 is connected to the busbar 41, and the other end of the L-shaped structure 431 has an externally projecting end 433 that protrudes upward; in some embodiments of the present application, the terminal 47 has an L-shaped structure 471. One end of the L-shaped structure 471 is connected to the busbar 41, and the other end of the L-shaped structure 471 has an externally projecting end 473 that protrudes upward.

[0062] The interconnected busbar 41 and terminal 43 are disposed adjacent to the end 110 of the battery cell 11 and are electrically connected to the outwardly extending wire 118; in some embodiments of the present application, the busbar 41, the terminal 43 and the wire 118 are welded together. The interconnected busbar 45 and terminal 47 are disposed adjacent to the end 140 of the battery cell 14 and are electrically connected to the outwardly extending wire 148; in some embodiments of the present application, the busbar 45, the terminal 47 and the wire 148 are welded together. In addition, the externally projecting end 433 of the terminal 43 is configured to protrude upward from the battery cover 32. Therefore, the externally projecting end 433 of the terminal 43 can be externally exposed from the battery cover 32; the externally projecting end 473 of the terminal 47 is configured to protrude upward from the battery cover 32. Therefore, the externally projecting end 473 of the terminal 47 can be externally exposed from the battery cover 32.

[0063] As Figure 9As shown, end caps 35, 37 and a plurality of glue hole caps 38 are further provided. The end cap 35 is configured to cooperate with the battery cell compartment 31 and the battery cover 32 to cover one end of the battery cell 10. In some embodiments of the present application, the end cap 35 covers the end 110 of the battery cell unit 11 of the battery cell 10 and simultaneously covers the bus bar 41 adjacent to the end 110 of the battery cell unit 11. The end cap 37 is configured to cooperate with the battery cell compartment 31 and the battery cover 32 to cover the other end of the battery cell 10. In some embodiments of the present application, the end cap 37 covers the end 140 of the battery cell unit 14 of the battery cell 10 and simultaneously covers the bus bar 45 adjacent to the end 140 of the battery cell unit 14.

[0064] In addition, the plurality of glue hole caps 38 are configured to cover the glue injection holes 3115, 3135, 3155, 3175, 3195 and the paired glue outlet holes 3215, 3235, 3255, 3275, 3295.

[0065] After the end caps 35, 37 and a plurality of glue hole caps 38 respectively seal the two ends of the battery cell 10 and the glue injection holes 3115, 3135, 3155, 3175, 3195 and the glue outlet holes 3215, 3235, 3255, 3275, 3295, acid is injected into the battery tank 31 through the acid inlets 312, 314, 316, 318. In some embodiments of the present application, the acid is injected into the sealed space containing the battery cell 11 through the acid inlet 312, and the acid injected into the sealed space will not further flow outwards because the space has a sealing wall adjacent to the end 110 of the battery cell 11 and a sealing wall located between the battery cell 11 and the battery cell 12, nor will it flow into the sealed space containing the battery cell 12. In some embodiments of the present application, the acid is injected into the sealed space containing the battery cell 12 through the acid inlet 314, and the acid injected into the sealed space will not further flow into the sealed space containing the battery cell 11 and / or the sealed space containing the battery cell 13 because the sealed space has a sealing wall located between the battery cell 11 and the battery cell 12 and a sealing wall located between the battery cell 12 and the battery cell 13. In some embodiments of the present application, the acid is injected into the sealed space containing the battery cell 13 through the acid inlet 316, and the acid injected into the sealed space will not further flow into the sealed space containing the battery cell 12 and / or the sealed space containing the battery cell 14 because the sealed space has a sealing wall located between the battery cell 12 and the battery cell 13 and a sealing wall located between the battery cell 13 and the battery cell 14. In some embodiments of the present application, the acid is injected into the sealed space containing the battery cell 14 through the acid inlet 318, and the acid injected into the sealed space will not further flow outwards and / or flow into the sealed space containing the battery cell 13 because the space has a sealing wall adjacent to the end 140 of the battery cell 14 and a sealing wall located between the battery cell 13 and the battery cell 14.

[0066] As Figure 10 shown, an acid inlet cap 70, a relief valve 71 and a relief valve cap 72 are further provided. After the acid is injected into the battery tank 31 through the acid inlets 312, 314, 316, 318, a plurality of acid inlet caps 70 are used to respectively seal the acid inlets 312, 314, 316, 318, and a plurality of relief valves 71 are respectively installed in the acid outlet holes 322, 324, 326, 328, and the relief valve cap 72 and the relief valve 71 are cooperated with each other.

[0067] Figure 11A For the bipolar battery 1 manufactured by the above manufacturing method, Figure 11B For Figure 11ASchematic cross-sectional view of the bipolar battery 1 shown. In some embodiments of the present application, the resin glue injected into the glue injection groove 111, the elastic ring 21, the skirt 311 of the battery case 31, and the skirt 321 of the battery cover 32 are configured to jointly form a sealing wall adjacent to the end 110 of the battery cell 11; the resin glue injected into the glue injection groove 112, the elastic ring 22, the skirt 313 of the battery case 31, and the skirt 323 of the battery cover 32 are configured to jointly form a sealing wall located between the battery cell 11 and the battery cell 12; the resin glue injected into the glue injection groove 121, the elastic ring 23, the skirt 315 of the battery case 31, and the skirt 325 of the battery cover 32 are configured to jointly form a sealing wall located between the battery cell 12 and the battery cell 13; the resin glue injected into the glue injection groove 131, the elastic ring 24, the skirt 317 of the battery case 31, and the skirt 327 of the battery cover 32 are configured to jointly form a sealing wall located between the battery cell 13 and the battery cell 14; the resin glue injected into the glue injection groove 141, the elastic ring 25, the skirt 319 of the battery case 31, and the skirt 329 of the battery cover 32 are configured to jointly form a sealing wall adjacent to the end 140 of the battery cell 14, and the above-mentioned sealing walls are configured to achieve sealing between adjacent battery cells, preventing liquid leakage or gas leakage between adjacent battery cells.

[0068] According to the above, the embodiments of the present application can effectively achieve the sealing between adjacent battery cells in the battery core of the bipolar battery, and indeed prevent liquid leakage or gas leakage between adjacent battery cells.

[0069] References to "some embodiments", "partial embodiments", "one embodiment", "another example", "example", "specific example", or "partial example" throughout the specification mean that at least one embodiment or example in the present application includes the specific features, structures, or characteristics described in that embodiment or example. Therefore, descriptions such as "in some embodiments", "in embodiments", "in one embodiment", "in another example", "in an example", "in a specific example", or "example" that appear throughout the specification do not necessarily refer to the same embodiments or examples in the present application.

[0070] Although the present application has been described and illustrated with reference to specific embodiments thereof, such description and illustration do not limit the present application. Those skilled in the art will clearly understand that various changes can be made without departing from the true spirit and scope of the present application, and equivalent components can be substituted within the embodiments. The drawings are not necessarily drawn to scale. Due to variables in the manufacturing process and so on, there may be differences between the artistic reproduction and the actual device in the present application. There may be other embodiments of the present application that are not specifically described. The present specification and the drawings should be regarded as illustrative rather than restrictive. Modifications can be made to adapt a particular situation, material, composition of matter, substance, method, or process to the objectives, spirit, and scope of the present application. All such modifications fall within the scope of the present application.

Claims

1. A bipolar battery, comprising: a battery core having at least one bipolar plate; a first elastic ring having a plurality of holes penetrating its body, and surrounding the battery core and located between the positive and negative plates of the bipolar plate; a battery case configured to accommodate the battery core, wherein an inner surface of the battery case has a first skirt, and wherein the first skirt is configured to extend along the first elastic ring and cooperate with the first elastic ring; and a battery cover configured to cooperate with the battery case, wherein an inner surface of the battery cover has a second skirt, and wherein the second skirt is configured to extend along the first elastic ring and cooperate with the first elastic ring, wherein the first skirt and the second skirt together form an annular space, the first elastic ring is located within the annular space, and wherein a resin adhesive is injected into the annular space, the holes in the first elastic ring, and the space between the positive and negative plates of the bipolar plate, so that the first skirt, the second skirt, the first elastic ring, and the resin adhesive together form a sealing wall.

2. The bipolar battery according to claim 1, wherein the first elastic ring comprises a rubber material or a foamed elastic material.

3. The bipolar battery according to claim 1, wherein the first skirt has a groove structure, and the second skirt also has a groove structure.

4. The bipolar battery according to claim 3, wherein the first skirt and the second skirt are configured to cooperate with each other, and wherein the groove structure of the first skirt and the groove structure of the second skirt cooperate with each other to form an annular space.

5. The bipolar battery according to claim 1, wherein the battery case has a first through hole and the battery cover has a second through hole, wherein the position of the first through hole is aligned with the first skirt of the battery case, and the position of the second through hole is aligned with the second skirt of the battery cover.

6. The bipolar battery according to claim 5, wherein the battery cover further has a third through hole, and wherein the position of the third through hole is aligned with the second skirt of the battery cover.

7. The bipolar battery according to claim 1, wherein the battery case is configured to cover opposite first and second surfaces of the battery core and a third surface connected to the first and second surfaces, and wherein the battery cover is configured to cover a fourth surface of the battery core opposite to the third surface.

8. The bipolar battery according to claim 7, further comprising two end caps configured to cooperate with the battery case and the battery cover and configured to cover a first end face of the battery core and a second end face opposite to the first end face, respectively.

9. The bipolar battery as claimed in claim 8 further includes a first bus bar and a first terminal connected to the first bus bar, and a second bus bar and a second terminal connected to the second bus bar, wherein the first bus bar is adjacent to the first end face of the battery core, the second bus bar is adjacent to the second end face of the battery core, and the first and second bus bars are electrically connected to the battery core and are covered by the two end caps, and wherein the first terminal and the second terminal are exposed from the battery cover.

10. The bipolar battery as claimed in claim 9, wherein the first terminal further has an L-shaped structure, one end of the L-shaped structure is connected to the first bus bar, and the other end of the L-shaped structure is configured to expose the first terminal from the battery cover, and wherein the second terminal further has an L-shaped structure, one end of the L-shaped structure is connected to the second bus bar, and the other end of the L-shaped structure is configured to expose the second terminal from the battery cover.

11. The bipolar battery as claimed in claim 1 further includes a second elastic ring and a third elastic ring, wherein the second elastic ring has a plurality of holes penetrating through its body, is disposed around the battery core and is adjacent to the first end face of the battery core, the third elastic ring has a plurality of holes penetrating through its body, is disposed around the battery core and is adjacent to the second end face opposite to the first end face of the battery core, and wherein the battery case has a second skirt and a third skirt protruding from its inner surface, the second skirt is adjacent to the first end face of the battery core and is configured to extend along the second elastic ring and engage with the second elastic ring, the third skirt is adjacent to the second end face of the battery core and is configured to extend along the third elastic ring and engage with the third elastic ring, and wherein the battery cover has a fourth skirt and a fifth skirt protruding from its inner surface, the fourth skirt is adjacent to the first end face of the battery core and is configured to extend along the second elastic ring and engage with the second elastic ring, the fifth skirt is adjacent to the second end face of the battery core and is configured to extend along the third elastic ring and engage with the third elastic ring; a resin adhesive is injected into the annular space formed by the second skirt and the fourth skirt and the holes of the second elastic ring, so that the second skirt, the fourth skirt, the second elastic ring and the resin adhesive together form a sealing wall; a resin adhesive is injected into the annular space formed by the third skirt and the fifth skirt and the holes of the third elastic ring, so that the third skirt, the fifth skirt, the third elastic ring and the resin adhesive together form a sealing wall.

12. The bipolar battery as claimed in claim 11, wherein the battery case has a fourth through hole and a fifth through hole, and the battery cover has a sixth through hole and a seventh through hole, wherein the positions of the fourth through hole and the fifth through hole are respectively aligned with the second skirt and the third skirt of the battery case, and the positions of the sixth through hole and the seventh through hole are respectively aligned with the fourth skirt and the fifth skirt of the battery cover.

13. The bipolar battery according to claim 11, wherein the second skirt has a groove structure, the third skirt has a groove structure, the fourth skirt has a groove structure, and the fifth skirt has a groove structure.

14. A bipolar battery comprising: a battery core having a first battery cell and a second battery cell connected to each other, and a glue injection groove formed between the first battery cell and the second battery cell; a battery housing configured to cover the battery core; and a first sealing wall formed within the battery housing and located between the first battery cell and the second battery cell; wherein the first sealing wall includes a colloid formed between the first battery cell and the second battery cell, a first elastic ring configured to be sleeved on the battery core and located between the first battery cell and the second battery cell, and a first skirt formed on the inner surface of the battery housing and extending around the first elastic ring, and wherein the first elastic ring is generally aligned with the glue injection groove between the first battery cell and the second battery cell, and the first elastic ring has a plurality of holes penetrating through its body, and the colloid enters the glue injection groove through the holes.

15. The bipolar battery according to claim 14, wherein the first skirt is configured to engage the first elastic ring.

16. The bipolar battery according to claim 14, wherein the first sealing wall is configured to achieve sealing between the first battery cell and the second battery cell.

17. The bipolar battery according to claim 14, wherein the battery housing has a first surface and a second surface opposite the first surface, wherein the first surface has a first through hole and the second surface has a second through hole, wherein the position of the first through hole is aligned with the first skirt of the battery housing, and the position of the second through hole is aligned with the first skirt of the battery housing.

18. The bipolar battery according to claim 14, wherein the battery housing has a first surface and a second surface opposite the first surface, wherein the first surface of the battery housing has a pair of first through holes and the second surface of the battery housing has a second through hole, wherein the positions of the pair of first through holes are respectively aligned with the first skirt of the battery housing, and the position of the second through hole is aligned with the first skirt of the battery housing.

19. The bipolar battery according to claim 14, further comprising a second sealing wall, wherein the second sealing wall is formed within the battery housing and adjacent to a first end of the battery core, and includes a colloid formed at the first end, a second elastic ring configured to be sleeved on the battery core and adjacent to the first end of the battery core, and a second skirt formed on the inner surface of the battery housing and extending around the second elastic ring, and wherein the first end of the battery core has a glue injection groove, the second elastic ring is generally aligned with the glue injection groove at the first end of the battery core, and the second elastic ring has a plurality of holes penetrating through its body, and the colloid formed at the first end enters the glue injection groove through the holes.

20. The bipolar battery according to claim 19, wherein the first surface of the battery housing has a pair of third through-holes and the second surface of the battery housing has a fourth through-hole, wherein the positions of the pair of third through-holes are respectively aligned with the second skirt of the battery housing, and the position of the fourth through-hole is aligned with the second skirt of the battery housing.

21. A method of manufacturing a bipolar battery; Providing a battery core, the battery core including a first battery cell and a second battery cell connected to each other; Placing an elastic ring around the connection between the first battery cell and the second battery cell of the battery core, wherein the elastic ring has a plurality of holes penetrating through its body; Placing the battery core into a battery slot, wherein the elastic ring sleeved on the battery core cooperates with a first skirt formed on the inner surface of the battery slot; and Cooperating a battery cover with the battery slot to form a battery housing covering the battery core, wherein the elastic ring member sleeved on the battery core cooperates with a second skirt formed on the inner surface of the battery cover, and wherein, When the battery cover and the battery slot cooperate with each other, the first skirt of the battery slot and the second skirt of the battery cover cooperate with each other to form an annular space together; And Injecting resin glue into the annular space and allowing the resin glue to enter the holes, so that the injected resin glue and the elastic ring, the first skirt of the battery slot, and the second skirt of the battery cover jointly form a sealing wall adjacent to the ends of the first battery cell and the second battery cell.

22. The method according to claim 21, wherein the battery slot has a glue injection hole communicating with the annular space, and wherein the colloid is injected between the first battery cell and the second battery cell from the glue injection hole.

23. The method according to claim 22, wherein the battery cover includes a glue outlet hole communicating with the annular space, and wherein a part of the colloid overflows through the glue outlet hole.

24. The method according to claim 22, wherein the colloid, the first skirt, the second skirt, and the elastic ring are configured such that a first space containing the first battery cell in the battery housing and a second space containing the second battery cell in the battery housing are separated from each other.

25. The method according to claim 24, wherein the battery slot has a first acid inlet communicating with the first space and a second acid inlet communicating with the second space, and wherein acid liquid is injected into the first space and the second space through the first acid inlet and the second acid inlet respectively.

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