Battery cover plate and battery

Abstract

The invention provides a battery cover plate and a battery, relates to the technical field of batteries, and aims to optimize the structure of the battery cover plate to a certain extent, reduce the difficulty in the battery assembly process and improve the operation efficiency. The battery cover plate provided by the invention is used for a battery and comprises a positive electrode cover plate assembly and a negative electrode cover plate assembly, the positive cover plate assembly comprises a positive cover plate and a positive pole, and the negative cover plate comprises a negative cover plate and a negative pole; the positive pole is hermetically connected with the positive cover plate, one end of the positive pole is connected with a positive tab of the battery, the other end of the positive pole protrudes out of one side, deviating from the positive tab, of the positive cover plate, one end of the negative pole is connected with a negative tab of the battery, and the other end of the negative pole protrudes out of one side, deviating from the negative tab, of the negative cover plate; and the positive electrode cover plate and the negative electrode cover plate are in butt joint and cover an opening formed by a shell of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cover and a battery. Background Art

[0002] With the development of new energy vehicles, the application of batteries in vehicles has become more popular. Usually, the batteries used in vehicles include components such as a casing, a battery cell and a cover plate. A sealed cavity can be formed through the sealed connection between the cover plate and the casing to provide a carrying space for the battery cell and the electrolyte.

[0003] At present, the battery forming process needs to complete the assembly processes such as battery cell forming, connection between the tab and the pole, connection between the pole and the cover, and connection between the cover and the shell. Usually, the connection between the tab and the pole, the pole and the cover, and the cover and the shell are mostly achieved by welding. However, since the battery cell includes a positive tab and a negative tab, when the welding of one tab is completed, the welding difficulty of the other tab will increase. Not only is it easy to have problems of missed welding or over-welding, but also the efficiency of the welding operation is greatly reduced.

[0004] Therefore, there is an urgent need to provide a battery cover and a battery to solve the problems existing in the prior art to a certain extent. Summary of the invention

[0005] The object of the present invention is to provide a battery cover and a battery, so as to optimize the battery cover structure to a certain extent, reduce the difficulty of the battery assembly process, and improve the operation efficiency.

[0006] A battery cover provided by the present invention is used for a battery, comprising a positive cover assembly and a negative cover assembly; the positive cover assembly comprises a positive cover and a positive pole column, and the negative cover comprises a negative cover and a negative pole column; the positive pole column is sealed and connected to the positive cover, and one end of the positive pole column is connected to the positive pole ear of the battery, and the other end protrudes from the side of the positive cover away from the positive pole ear, and one end of the negative pole column is connected to the negative pole ear of the battery, and the other end protrudes from the side of the negative cover away from the negative pole ear; the positive cover and the negative cover are connected to each other and sealed to the opening formed by the battery shell.

[0007] Among them, the positive electrode column includes a first electrode column part and a first sealing part, and the negative electrode column includes a second electrode column part and a second sealing part; one end of the first electrode column part passes through the positive electrode cover plate and is connected to the first sealing part, and the first sealing part is sealed to the positive electrode cover plate; one end of the second electrode column part passes through the negative electrode cover plate and is connected to the second sealing part, and the second sealing part is sealed to the negative electrode cover plate.

[0008] Specifically, the positive electrode cover plate assembly also includes a first lead-out plate, and the negative electrode cover plate assembly also includes a second lead-out plate; one end of the first lead-out plate is connected to the positive electrode tab, and the other end is connected to the first pole column; one end of the second lead-out plate is connected to the negative electrode tab, and the other end is connected to the second pole column.

[0009] Furthermore, the battery cover provided by the present invention also includes a first inner connecting plate and a second inner connecting plate; one end of the first inner connecting plate is connected to the positive electrode tab, and the other end is connected to one end of the first lead-out plate, and the other end of the first lead-out plate is connected to the positive electrode column; one end of the second inner connecting plate is connected to the negative electrode tab, and the other end is connected to one end of the second lead-out plate, and the other end of the second lead-out plate is connected to the negative electrode column.

[0010] Furthermore, the positive electrode cover plate and the negative electrode cover plate are both made of plastic material, the first inner connecting plate is made of aluminum alloy material, when the battery is a lithium-ion battery, the second inner connecting plate is made of copper or copper alloy, and when the battery is a sodium-ion battery, the second inner connecting plate is made of aluminum or aluminum alloy.

[0011] Wherein, a mounting groove is formed on the positive electrode cover plate, and an explosion-proof valve is arranged in the mounting groove; and a liquid injection hole is formed on the negative electrode cover plate.

[0012] Specifically, the battery cover provided by the present invention further includes a positioning member, one end of which is connected to an end of the positive cover away from the positive pole, and the other end of which is connected to an end of the negative cover away from the negative pole.

[0013] Compared with the prior art, the battery cover provided by the present invention has the following advantages:

[0014] The battery cover provided by the present invention is used for a battery, and comprises a positive cover assembly and a negative cover assembly; the positive cover assembly comprises a positive cover and a positive pole column, and the negative cover comprises a negative cover and a negative pole column; the positive pole column is sealedly connected to the positive cover, and one end of the positive pole column is connected to the positive pole ear of the battery, and the other end protrudes from the side of the positive cover away from the positive pole ear, and one end of the negative pole column is connected to the negative pole ear of the battery, and the other end protrudes from the side of the negative cover away from the negative pole ear; the positive cover and the negative cover are connected to each other and sealed to form an opening formed by a battery shell.

[0015] From this analysis, it can be seen that by connecting the positive electrode post on the positive cover plate and the negative electrode post on the negative cover plate, the electrical connection between the positive electrode cover plate assembly and the positive electrode tab of the battery cell in the battery and the electrical connection between the negative electrode cover plate assembly and the negative electrode tab of the battery cell can be achieved.

[0016] Since the positive electrode cover plate and the negative electrode cover plate in the present application are two separate independent structures, during welding, the positive electrode post and the positive electrode tab as well as the negative electrode post and the negative electrode tab can be welded separately without affecting or interfering with each other.

[0017] After the corresponding welding of the positive electrode ear and the positive electrode column, as well as the negative electrode ear and the negative electrode column is completed, the positive electrode cover plate and the negative electrode cover plate are welded to each other, and finally welded to the battery shell to complete the formation of the overall battery, which can reduce the difficulty of the battery assembly process to a certain extent and improve the work efficiency.

[0018] In addition, the present invention also provides a battery, including a battery cell, a shell and the above-mentioned battery cover; the battery cell is arranged in the shell, and the shell forms an open part, the battery cover is sealed on the open part of the shell, and is sealed and connected to the shell.

[0019] Among them, a plurality of baffle parts are provided in the shell, and the plurality of baffle parts divide the shell into a plurality of accommodating cavities, and the battery cells are arranged in a one-to-one correspondence with the accommodating cavities; the battery cover plates are arranged in a one-to-one correspondence with the accommodating cavities, and a plurality of the battery cover plates are spliced.

[0020] Specifically, a positioning portion is formed on the edge of the shell, and the edge of the battery cover plate matches with the positioning portion and is embedded in the positioning portion.

[0021] When welding a battery using the battery cover provided by the present application, the positive electrode post connected to the positive electrode cover and the negative electrode post connected to the negative electrode cover can be independently welded to the positive electrode tab and the negative electrode tab of the corresponding battery cell, thereby achieving non-interference in the welding process, thereby reducing the difficulty of welding, improving work efficiency, and improving the welding quality to a certain extent, thereby ensuring the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the overall structure of a battery cover provided by an embodiment of the present invention;

[0024] Figure 2 A schematic structural diagram of a battery cover from a first perspective provided by an embodiment of the present invention;

[0025] Figure 3A schematic diagram of the connection between the positioning member in the battery cover plate and the positive electrode cover plate and the negative electrode cover plate provided in an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the connection between the battery cover and the battery cell provided in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the structure of a battery cover plate and a battery cell after welding provided by an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the structure of a battery cell and a battery cover plate in a state where the battery cell and the battery cover plate enter a shell according to an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of the structure of a battery housing provided in an embodiment of the present invention;

[0030] Figure 8 A schematic diagram of the cooperation between a battery cover and a shell in a battery provided in an embodiment of the present invention.

[0031] In the figure: 1-positive electrode cover; 101-positive electrode column; 1011-first electrode column; 1012-first sealing portion; 102-explosion-proof valve; 2-negative electrode cover; 201-negative electrode column; 2011-second electrode column; 2012-second sealing portion; 202-liquid injection hole; 3-positioning member; 4-first lead-out plate; 5-second lead-out plate; 6-first internal connecting plate; 7-second internal connecting plate; 8-shell; 801-baffle portion; 802-accommodating chamber; 803-positioning portion; 9-battery cell. DETAILED DESCRIPTION

[0032] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0033] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0037] For ease of description, spatial relative terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0038] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0039] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0040] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present application.

[0041] like Figure 1-Figure 5 As shown, the present invention provides a battery cover, which is used for a battery, including a positive cover 1 component and a negative cover 2 component; the positive cover 1 component includes a positive cover 1 and a positive pole column 101, and the negative cover 2 includes a negative cover 2 and a negative pole column 201; the positive pole column 101 is sealed and connected to the positive cover 1, and one end of the positive pole column 101 is connected to the positive pole ear of the battery, and the other end protrudes from the side of the positive cover 1 away from the positive pole ear, and one end of the negative pole column 201 is connected to the negative pole ear of the battery, and the other end protrudes from the side of the negative cover 2 away from the negative pole ear; the positive cover 1 and the negative cover 2 are connected to each other and sealed to the opening formed by the battery shell 8.

[0042] Compared with the prior art, the battery cover provided by the present invention has the following advantages:

[0043] The battery cover provided by the present invention can realize the electrical connection between the positive electrode cover 1 assembly and the positive electrode tab of the battery cell 9 in the battery, and the electrical connection between the negative electrode cover 2 assembly and the negative electrode tab of the battery cell 9, by connecting the positive electrode pole 101 on the positive electrode cover 1 and connecting the negative electrode pole 201 on the negative electrode cover 2.

[0044] Since the positive electrode cover plate 1 and the negative electrode cover plate 2 in the present application are two separate independent structures, during welding, the positive electrode column 101 and the positive electrode tab as well as the negative electrode column 201 and the negative electrode tab can be welded separately without affecting or interfering with each other.

[0045] After the corresponding welding of the positive electrode tab and the positive electrode column 101 as well as the negative electrode tab and the negative electrode column 201 is completed, the positive electrode cover plate 1 and the negative electrode cover plate 2 are welded together, and finally welded to the battery shell 8 to complete the formation of the overall battery, thereby reducing the difficulty of the battery assembly process to a certain extent and improving the operating efficiency.

[0046] It can be understood that the positive electrode cover plate 1 and the negative electrode cover plate 2 in the present application are split structures, and the connection between the two can be achieved by welding. After the positive electrode cover plate 1 and the negative electrode cover plate 2 are welded, they are welded to the shell 8 to ensure the integrity of the battery cover plate.

[0047] Optionally, as in 2 combined Figure 3 As shown, the positive electrode column 101 in the present application includes a first electrode column portion 1011 and a first sealing portion 1012, and the negative electrode column 201 includes a second electrode column portion 2011 and a second sealing portion 2012; one end of the first electrode column portion 1011 passes through the positive electrode cover plate 1 and is connected to the first sealing portion 1012, and the first sealing portion 1012 is sealed and connected to the positive electrode cover plate 1; one end of the second electrode column portion 2011 passes through the negative electrode cover plate 2 and is connected to the second sealing portion 2012, and the second sealing portion 2012 is sealed and connected to the negative electrode cover plate 2.

[0048] Since the battery cover and the shell 8 need to form a sealed cavity structure after the battery is formed, the positive electrode column 101 in the present application includes a first electrode column portion 1011 and a first sealing portion 1012, and the negative electrode column 201 includes a second electrode column portion 2011 and a second sealing portion 2012, and the first sealing portion 1012 and the second sealing portion 2012 in the present application are both sealing rings, and are correspondingly sleeved on the first electrode column portion 1011 and the second electrode column portion 2011, so that when the first electrode column portion 1011 is installed correspondingly to the positive electrode cover 1 and the second electrode column portion 2011 is installed correspondingly to the negative electrode cover 2, the first sealing portion 1012 and the second sealing portion 2012 can be compressed, thereby realizing a sealed connection between the first electrode column portion 1011 and the positive electrode cover 1 and the second electrode column portion 2011 and the negative electrode cover 2, thereby ensuring the sealing performance of the overall battery cover.

[0049] It should be additionally explained here that the positive electrode column 101 and the negative electrode column 201 mentioned above in the present application can also be directly sealed and connected with the positive electrode cover plate 1 and the negative electrode cover plate 2 by nano injection molding.

[0050] Alternatively, if Figure 2-Figure 4 As shown, the positive electrode cover plate 1 assembly in the present application also includes a first lead-out plate 4, and the negative electrode cover plate 2 assembly also includes a second lead-out plate 5; one end of the first lead-out plate 4 is connected to the positive electrode tab, and the other end is connected to the first pole column portion 1011; one end of the second lead-out plate 5 is connected to the negative electrode tab, and the other end is connected to the second pole column portion 2011.

[0051] Since the positive electrode tab and the negative electrode tab of the battery cell 9 are both in a sheet-like structure after integration, by further connecting the first lead-out sheet 4 to the positive electrode column 101 and the second lead-out sheet 5 to the negative electrode column 201, the welding area between the positive electrode tab and the negative electrode tab can be increased, thereby further reducing the welding difficulty.

[0052] It is understandable that during welding, one end of the first lead-out piece 4 is first welded to the positive electrode tab, and then the other end of the first lead-out piece 4 is welded to the positive electrode post 101 , so that electrical connection between the positive electrode tab and the positive electrode post 101 can be achieved through the first lead-out piece 4 .

[0053] Correspondingly, one end of the second lead-out piece 5 is first welded to the negative electrode tab, and then the other end of the second lead-out piece 5 is welded to the negative electrode post 201 , so that electrical connection between the negative electrode tab and the negative electrode post 201 can be achieved through the second lead-out piece 5 .

[0054] Furthermore, if Figure 4 As shown, the battery cover provided by the present invention also includes a first inner connecting plate 6 and a second inner connecting plate 7; one end of the first inner connecting plate 6 is connected to the positive electrode tab, and the other end is connected to one end of the first lead-out plate 4, and the other end of the first lead-out plate 4 is connected to the positive electrode column 101; one end of the second inner connecting plate 7 is connected to the negative electrode tab, and the other end is connected to one end of the second lead-out plate 5, and the other end of the second lead-out plate 5 is connected to the negative electrode column 201.

[0055] By further adding the first inner connecting sheet 6 and the second inner connecting sheet 7 between the positive electrode column 101 and the first lead-out sheet 4 and the negative electrode column 201 and the second lead-out sheet 5, the welding area can be further increased, so that the positive electrode cover plate 1 and the negative electrode cover plate 2 can be welded at a position farther away from the positive electrode tab and the negative electrode tab, and the positive electrode cover plate 1 and the negative electrode cover plate 2 can be placed in a position such as Figure 4 Welding is performed in the flipped state shown, so that the entire welding process is carried out in an exposed state, which can make the welding process simpler and the welding degree easier to control, thereby improving work efficiency while ensuring welding quality.

[0056] Optionally, the positive electrode cover plate 1 and the negative electrode cover plate 2 in the present application are both made of plastic material, the first inner connecting plate 6 is made of aluminum alloy material, when the battery is a lithium-ion battery, the second inner connecting plate 7 is made of copper or copper alloy, and when the battery is a sodium-ion battery, the second inner connecting plate 7 is made of aluminum or aluminum alloy.

[0057] The positive electrode cover plate 1 and the negative electrode cover plate 2 are made of plastic material, which can improve the insulation performance between the positive electrode column 101 and the negative electrode column 201 on the one hand, and on the other hand, the welding of the positive electrode cover plate 1 and the negative electrode cover plate 2 and the welding of the positive electrode cover plate 1 and the negative electrode cover plate 2 to form the battery cover plate and the shell 8 can be achieved by hot melt welding, making the welding process simpler and more efficient.

[0058] The first inner connecting plate 6 in the present application is preferably made of 1060 aluminum, and the second inner connecting plate 7 is preferably made of pure copper, and further preferably, the copper surface is nickel-plated, and the thickness of the nickel layer can be 1um-20um.

[0059] Alternatively, if Figure 1 Combination Figure 5 As shown, a mounting groove is formed on the positive electrode cover plate 1 in the present application, and an explosion-proof valve 102 is arranged in the mounting groove; and a liquid injection hole 202 is formed on the negative electrode cover plate 2.

[0060] The mounting groove formed on the positive electrode cover plate 1 can provide a stable mounting position for the explosion-proof valve 102 , and the explosion-proof valve 102 can release pressure in time when the battery has thermal runaway, thereby avoiding the risk of battery explosion to a certain extent.

[0061] Preferably, the explosion-proof valve 102 in the present application is an explosion-proof membrane, which is made of polyolefin and can be laser welded or hot-pressed sealed with the positive electrode cover plate 1 .

[0062] The injection hole 202 formed on the negative electrode cover 2 can facilitate the injection of electrolyte into the shell 8. Accordingly, by forming the injection hole 202 on the negative electrode cover 2 and arranging the explosion-proof valve 102 on the positive electrode cover 1, mutual influence and interference between the two can be avoided, thereby ensuring the stable use of the entire battery.

[0063] Alternatively, if Figure 1 Combination Figure 3 and Figure 4 As shown, the battery cover provided by the present invention also includes a positioning member 3, one end of the positioning member 3 is connected to the end of the positive cover 1 away from the positive pole 101, and the other end of the positioning member 3 is connected to the end of the negative cover 2 away from the negative pole 201.

[0064] Since a single battery cell 9 is formed with a positive electrode tab and a negative electrode tab, by further connecting a positioning component 3 between the positive cover plate 1 and the negative cover plate 2, that is, at one end of the positive cover plate 1 away from the positive electrode column 101 and at one end of the negative cover plate 2 away from the negative electrode column 201, the relative positions of the positive electrode tab and the negative electrode tab and between the positive cover plate 1 and the negative electrode cover plate 2 after welding can be limited, thereby avoiding the problem of movement of the positive cover plate 1 and the negative electrode cover plate 2 to a certain extent, resulting in open welding or damage to the tabs.

[0065] It should be noted here that the thickness of the positioning member 3 in the present application is greater than the overall thickness of the positive cover plate 1 and the first lead-out piece 4, so that after the positioning member 3 is connected to the positive cover plate 1 and the negative cover plate 2, the end of the positioning member 3 away from the positive cover plate 1 and the negative cover plate 2 can be closer to the battery cell 9, thereby ensuring the limiting and stabilizing effect between the battery cell 9 and the battery cover plate.

[0066] Preferably, the positioning member 3 in the present application is a rectangular frame structure, which can reduce the structural weight to the greatest extent.

[0067] In addition, if Figure 6 As shown, the present invention also provides a battery, including a battery cell 9, a shell 8 and the above-mentioned battery cover; the battery cell 9 is arranged in the shell 8, and the shell 8 is formed with an open part, the battery cover is sealed on the open part of the shell 8, and is sealed and connected to the shell 8.

[0068] When welding a battery using the battery cover provided by the present application, the positive electrode post 101 connected to the positive electrode cover 1 and the negative electrode post 201 connected to the negative electrode cover 2 can be independently welded to the positive electrode tab and the negative electrode tab of the corresponding battery cell 9, thereby achieving non-interference in the welding process, thereby reducing the difficulty of welding, improving work efficiency, and improving the welding quality to a certain extent, thereby ensuring the safety of the battery.

[0069] Alternatively, if Figure 6 Combination Figure 7 As shown, a plurality of baffle portions 801 are provided in the shell 8, and the plurality of baffle portions 801 divide the shell 8 into a plurality of accommodating cavities 802, and the battery cells 9 are arranged in a one-to-one correspondence with the accommodating cavities 802; the battery cover plates are arranged in a one-to-one correspondence with the accommodating cavities 802, and a plurality of battery cover plates are spliced ​​together.

[0070] The shell 8 in the present application can be a single cavity, but preferably, by arranging a plurality of baffle portions 801 in the shell 8, the space in the shell 8 can be divided into a plurality of accommodating cavities 802, and by arranging the battery cells 9 and the accommodating cavities 802 in one-to-one correspondence, the baffle portions 801 can be used to separate adjacent battery cells 9, thereby ensuring the independence of each battery cell 9 in the shell 8, improving the degree of separation between the battery cells 9, achieving high voltage characteristics, and improving the safety of the battery.

[0071] It should be noted that the baffle portion 801 in the present application can be formed integrally with the housing 8, or the connection between the baffle portion 801 and the housing 8 can be achieved by welding. The intervals between the multiple baffle portions 801 in the present application are the same, and they are arranged parallel to each other, so that the size of each accommodating cavity 802 can be consistent, thereby achieving stable loading of the battery cell 9.

[0072] Here we need to further explain that Figure 6 As shown, since the battery in the present application includes a plurality of battery cells 9, and the positive electrode and the negative electrode between two adjacent battery cells 9 are connected in series, therefore, in two adjacent battery covers, the positive electrode cover plate 1 of one battery cover plate is connected to the negative electrode cover plate 2 of the other battery cover plate, and the negative electrode cover plate 2 is connected to the positive electrode cover plate 1 of the other battery cover plate, thereby forming a Figure 6In the assembly state shown, the positive electrodes and negative electrodes of adjacent battery cells 9 are connected in series.

[0073] It can be understood that the above-mentioned two adjacent battery cover plates in the present application are mainly for a split battery cover plate structure, that is, a positive electrode cover plate 1 corresponds to the positive electrode of a battery cell 9, and a negative electrode cover plate 2 corresponds to the negative electrode of a battery cell 9, and in some cases there are two or more battery cells 9 in parallel, and when in parallel, the positive electrodes of the battery cells 9 are located on the same side, accordingly, one positive electrode cover plate 1 can correspond to the positive electrodes of two or more battery cells 9, and in this case, the positive electrode cover plate 1 and the negative electrode cover plate 2 are also split structures.

[0074] The positive electrode cover plate 1 and the negative electrode cover plate 2 in the present application can also form an integrated structure, such as Figure 4 As shown, when it is an integrated structure, the layout on the overall cover is still designed according to the specific arrangement of the battery cells 9, that is, the positive electrode corresponds to the positive electrode, and the negative electrode corresponds to the negative electrode, which will not be repeated here.

[0075] Preferably, the shell 8 in the present application is made of plastic material, and the material of the shell 8 is consistent with the material of the battery cover, so as to ensure the stability of the welding between the shell 8 and the battery cover.

[0076] Accordingly, the shell 8 and battery cover made of plastic not only have good insulation performance, but also the plastic material has lower cost and is simpler to process. The connection between the battery cover and the shell 8 is easier and lighter.

[0077] It should be noted here that, since electrolyte needs to be injected into the cavity after the shell 8 and the battery cover are sealed and connected in the present application, the plastic in the present application can be an electrolyte-resistant plastic, and the electrolyte-resistant plastic can be polypropylene, polyethylene terephthalate, polyphenylene sulfide or modified polypropylene, modified polyethylene terephthalate, modified polyphenylene sulfide and other materials.

[0078] Alternatively, if Figure 8 As shown, a positioning portion 803 is formed on the edge of the shell 8 in the present application, and the edge of the battery cover is matched with the positioning portion 803 and embedded in the positioning portion 803.

[0079] The battery cover in the present application can also be made of modified laser-transmitting plastic, so that laser welding between the battery cover and the housing 8 can be achieved. In order to further improve the positioning effect of the housing 8 on the battery cover, the present application forms a positioning portion 803 at the edge of the housing 8, so that a rectangular fixing groove can be formed to position the battery cover.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cover for a battery, characterized in that: It includes a positive electrode cover plate assembly and a negative electrode cover plate assembly; The positive electrode cover plate assembly includes a positive electrode cover plate and a positive electrode column, and the negative electrode cover plate includes a negative electrode cover plate and a negative electrode column; The positive electrode column is sealed and connected to the positive electrode cover plate, and one end of the positive electrode column is connected to the positive electrode ear of the battery, and the other end protrudes from the side of the positive electrode cover plate away from the positive electrode ear, and one end of the negative electrode column is connected to the negative electrode ear of the battery, and the other end protrudes from the side of the negative electrode cover plate away from the negative electrode ear; The positive electrode cover plate and the negative electrode cover plate are connected to each other and cover the opening formed by the battery shell.

2. The battery cover according to claim 1, characterized in that: The positive electrode column includes a first electrode column portion and a first sealing portion, and the negative electrode column includes a second electrode column portion and a second sealing portion; One end of the first pole portion passes through the positive electrode cover plate and is connected to the first sealing portion, and the first sealing portion is sealed and connected to the positive electrode cover plate; One end of the second pole portion passes through the negative electrode cover plate and is connected to the second sealing portion, and the second sealing portion is sealed and connected to the negative electrode cover plate.

3. The battery cover according to claim 2, characterized in that: The positive electrode cover plate assembly further includes a first lead-out plate, and the negative electrode cover plate assembly further includes a second lead-out plate; One end of the first lead-out piece is connected to the positive electrode tab, and the other end is connected to the first pole portion; One end of the second lead-out piece is connected to the negative electrode tab, and the other end is connected to the second pole column.

4. The battery cover according to claim 3, characterized in that: Also includes a first inner connecting sheet and a second inner connecting sheet; One end of the first inner connecting piece is connected to the positive electrode tab, and the other end is connected to one end of the first lead-out piece, and the other end of the first lead-out piece is connected to the positive electrode column; One end of the second inner connecting piece is connected to the negative electrode tab, and the other end is connected to one end of the second lead-out piece, and the other end of the second lead-out piece is connected to the negative electrode column.

5. The battery cover according to claim 4, characterized in that: The positive electrode cover plate and the negative electrode cover plate are both made of plastic material, the first inner connecting plate is made of aluminum alloy material, when the battery is a lithium ion battery, the second inner connecting plate is made of copper or copper alloy, when the battery is a sodium ion battery, the second inner connecting plate is made of aluminum or aluminum alloy.

6. The battery cover according to claim 1, characterized in that: A mounting groove is formed on the positive electrode cover plate, and an explosion-proof valve is arranged in the mounting groove; A liquid injection hole is formed on the negative electrode cover plate.

7. The battery cover according to claim 1, characterized in that: It also includes a positioning component, one end of which is connected to an end of the positive electrode cover plate away from the positive electrode column, and the other end of the positioning component is connected to an end of the negative electrode cover plate away from the negative electrode column.

8. A battery, characterized in that: A battery comprising a battery cell, a housing and a battery cover as claimed in any one of claims 1 to 7; The battery core is arranged in the shell, and the shell is formed with an open portion. The battery cover is sealed on the open portion of the shell and is sealed and connected with the shell.

9. The battery according to claim 8, characterized in that A plurality of baffles are provided in the shell, and the plurality of baffles divide the shell into a plurality of accommodating chambers, and the battery cells are arranged in a one-to-one correspondence with the accommodating chambers; The battery cover plates are arranged in one-to-one correspondence with the accommodating cavities, and a plurality of the battery cover plates are spliced ​​together.

10. The battery according to claim 8, characterized in that A positioning portion is formed on the edge of the shell, and the edge of the battery cover plate matches with the positioning portion and is embedded in the positioning portion.

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