Battery, battery module, battery pack and energy storage system

Abstract

The utility model provides a battery, a battery module, a battery pack and an energy storage system, and relates to the technical field of energy. The battery module provided by the utility model comprises a plurality of batteries and a busbar, each battery comprises a cover plate and a battery shell, the cover plate covers the battery shell, the cover plate comprises a pole and a through hole, a part of the pole is located in the through hole of the cover plate, the other part of the pole is located in the battery shell, and the pole is lower than the surface, deviating from the battery shell, of the cover plate. In addition, in any two adjacent batteries, one pole of one battery is electrically connected with one pole of the other battery through a busbar. In the battery module provided by the invention, the pole of the battery extends into the battery shell from the through hole, so that the risk of short circuit caused by exposure of the pole can be reduced. Besides, when the pole columns of any two adjacent batteries of the battery module are connected, the corresponding pole columns can be led out to one side, deviating from the battery shell, of the cover plate through the busbar, so that the convenience of connection between the pole columns of the adjacent batteries can be improved.

Description

Technical Field

[0001] The present application relates to the field of energy technology, and in particular to a battery, a battery module, a battery pack and an energy storage system. Background Art

[0002] As a green power source, secondary batteries (such as lithium batteries) are widely used in the field of new energy due to their advantages such as high energy density, long cycle life, no memory effect, low self-discharge rate and stable electrochemical properties.

[0003] At present, in order to meet the power demand in different scenarios, multiple batteries are usually connected in series or in parallel to form a battery module to provide the required voltage, capacity and power. When connecting multiple batteries, the current mainstream solution is to connect the battery poles and busbars by laser welding to achieve circuit conduction of each battery. The above connection scheme has low cost and high production efficiency. However, in the battery module formed by the laser welding scheme, if a single battery is abnormal, the abnormal battery cannot be disassembled and replaced separately, which makes the entire battery module unusable, resulting in a waste of resources. Utility Model Content

[0004] The present application provides a battery, a battery module, a battery pack and an energy storage system to achieve detachable connection between batteries, thereby improving the maintainability and recycling rate of the battery module and reducing the cost of the battery pack and the energy storage system.

[0005] In the first aspect, the present application provides a battery module, which includes a plurality of batteries and a busbar, wherein the plurality of batteries are arranged side by side, and each battery includes a cover plate and a battery shell, wherein the cover plate is covered on the battery shell. The cover plate includes a pole and a through hole, wherein a portion of the pole is located in the through hole of the cover plate and another portion of the pole is located in the battery shell, and a surface of another portion of the pole portion that is away from the pole is lower than a surface of the cover plate that is away from the battery shell. In addition, in any two adjacent batteries, a pole of one battery is electrically connected to a pole of another battery through a busbar. In the battery module provided by the present application, a portion of the pole of the battery is located in the through hole of the cover plate, which can improve the sealing of the battery to reduce the risk of battery leakage. In addition, another portion of the pole of the battery is located in the battery shell, and since the surface of another portion of the pole portion that is away from the pole is lower than the surface of the cover plate that is away from the battery shell, the pole of the battery is arranged in a manner that is recessed into the battery shell, which is conducive to reducing the risk of short circuit caused by the exposure of the pole. When connecting the poles of any two adjacent batteries in the battery module provided by the present application, the corresponding poles can be led out to the side of the cover plate away from the battery shell through the bus, so that the poles of the two adjacent batteries can be electrically connected through the same bus, which is conducive to improving the convenience of connection between the poles of adjacent batteries and increasing the flow area between the connected batteries to reduce the continuous impedance of the current flowing between the connected batteries, thereby helping to reduce the power consumption of the battery module.

[0006] In a possible implementation of the present application, the diameter of another part of the pole is greater than the diameter of a part of the pole. In addition, the battery module also includes an insulating plug and a connector, the insulating plug passes through the through hole of the cover plate, and the insulating plug abuts against the surface of another part of the pole that is away from the pole. In the present application, the electrical connection between the connector and the pole can be multiple, for example, the bus includes a through hole, the insulating plug also includes a through hole, and the through hole of the bus is arranged opposite to the through hole of the insulating plug, then the connector can be passed through the through hole of the bus and the through hole of the insulating plug in sequence and then electrically connected to the pole. In this way, the arrangement of the connector can be relatively simple, and it is convenient to realize the electrical connection between the bus and the connector, so that the electrical connection between the bus and the pole can be realized, so that the pole can be led out to the side of the cover plate away from the battery shell through the bus. And this design method also provides the possibility of separate disassembly of the batteries in the battery module, which is conducive to improving the maintainability and recycling rate of the battery module. In a possible implementation of the present application, the diameter of the through hole of the busbar is greater than or equal to the diameter of the through hole of the insulating plug. This helps to improve the efficiency of the connector passing through the through hole of the busbar and the through hole of the insulating plug in sequence, thereby helping to improve the assembly efficiency of the battery in the battery module.

[0007] In addition, in a possible implementation of the present application, the pole may further include a threaded hole, and the threaded hole of the pole is arranged opposite to the through hole of the insulating plug. The connector includes an external thread, and the connector can be screwed and locked with the threaded hole of the pole after passing through the through hole of the busbar and the through hole of the insulating plug. This is conducive to improving the contact reliability between the connector and the pole, and can improve the reliability of the electrical connection and mechanical connection between the busbar and the pole, thereby helping to improve the structural reliability of the battery module.

[0008] In a possible implementation of the present application, the through hole of the insulating plug may also be a threaded hole, and the connector may also be screwed and locked with the through hole of the insulating plug to improve the connection reliability between the connector and the battery. In addition, the pole may not be provided with a threaded hole, but only needs to make the connector reliably contact the pole, which is conducive to simplifying the processing technology of the pole.

[0009] In the present application, the busbar and the pole can also be electrically connected in other ways. In one possible implementation, the busbar includes a recessed portion and a connecting portion, the recessed portion is located in the through hole of the cover plate, the recessed portion abuts against the surface of another part of the pole that is away from the pole, and the connecting portion is located on the surface of the cover plate away from the battery shell. In addition, the battery module also includes an insulating plug, which is installed in the through hole of the cover plate, and the recessed portion is located between the insulating plug and the pole, so that the recessed portion of the busbar abuts against the pole. In this way, while realizing the electrical connection between the busbar and the pole, the connection method between the busbar and the pole can also be effectively simplified, thereby simplifying the structure of the battery module. And this design method also provides the possibility of separate disassembly of the batteries in the battery module, which is conducive to improving the maintainability and recycling rate of the battery module.

[0010] In order to achieve a detachable connection between the insulating plug and the through hole of the cover plate, in a possible implementation of the present application, the through hole of the cover plate is a threaded hole, the insulating plug includes an external thread, and the insulating plug and the through hole of the cover plate are screwed and locked, so that the insulating plug and the through hole of the cover plate are detachably connected by threaded connection, which is conducive to improving the convenience of connection between the two.

[0011] In a possible implementation of the present application, the end of the insulating plug facing away from the battery shell may also be provided with a screw-in groove, so as to facilitate screwing the insulating plug into the through hole of the cover plate or screwing the insulating plug out of the through hole.

[0012] In a possible implementation of the present application, along the arrangement direction from the cover plate to the battery shell, the length of the insulating plug may be less than or equal to the hole depth of the through hole of the cover plate, so that the insulating plug can be fully accommodated in the through hole of the cover plate by adjusting the size of the insulating plug, which can avoid the insulating plug being exposed and occupying the installation space of the battery module.

[0013] In a possible implementation of the present application, the battery further includes a cell, which is contained in a battery case. In addition, the cell includes a tab, and another portion of the pole is welded to the tab. Thus, the busbar and the tab are electrically connected, and the circuit between two adjacent batteries is conducted through the busbar.

[0014] In addition, since the diameter of a portion of the pole is smaller than the diameter of another portion of the pole, the area of ​​the pole used for connecting with the pole lug can be larger, thereby improving the convenience of connecting the two.

[0015] In a second aspect, the present application further provides a battery pack, which includes a housing and the battery module described in the first aspect, wherein the battery module is accommodated in the housing. In the battery pack provided in the present application, since the battery module has a low life cycle cost and a relatively reliable structure and charge-discharge performance, it is beneficial to reduce the cost of the battery pack over its entire life cycle and improve the reliability of the structure and charge-discharge performance of the battery pack.

[0016] In the third aspect, the present application also provides an energy storage system, which includes an energy storage converter and an energy storage cabinet, wherein the energy storage cabinet includes one or more battery packs as described in the second aspect, and the energy storage converter is electrically connected to the energy storage cabinet, and is used to convert the AC power output by the external power supply into DC power and then provide it to the energy storage cabinet, or to convert the DC power from the energy storage cabinet into AC power and output it to an external device. The battery pack of the energy storage system has a low life cycle cost, and the structure and charging and discharging performance are relatively reliable, so the cost of the energy storage system is low and the operating reliability is good.

[0017] In a fourth aspect, the present application further provides a battery, the battery comprising a cover plate, a battery shell and a battery cell, and the cover plate is covered on the battery shell. Among them, the cover plate comprises a pole and a through hole, part of the pole is located in the through hole of the cover plate and the other part of the pole is located in the battery shell, and the surface of the other part of the pole part away from the pole is lower than the surface of the cover plate away from the battery shell. In addition, the other part of the pole is welded to the pole ear of the battery cell. In the battery provided in the present application, part of the pole of the battery is located in the through hole of the cover plate, which can improve the sealing of the battery to reduce the risk of battery leakage. In addition, since the surface of the other part of the pole part away from the pole is lower than the surface of the cover plate away from the battery shell, the pole of the battery is arranged in a manner of being recessed into the battery shell, and the other part of the pole located in the battery shell is electrically connected to the pole ear of the battery cell, which is conducive to reducing the risk of short circuit caused by exposure of the pole.

[0018] In a possible implementation of the present application, the battery further includes an insulating plug, which passes through the through hole of the cover plate and abuts against the surface of another part of the pole that is away from the pole. This can effectively prevent the through hole of the cover plate from being deformed, thereby improving the structural reliability of the battery.

[0019] In the present application, the pole of the battery can be led to the outside of the battery shell through the bus. Specifically, the battery also includes a bus and a connector. The bus includes a through hole, and the insulating plug also includes a through hole. The through hole of the bus is arranged opposite to the through hole of the insulating plug. Then, the connector can pass through the through hole of the bus and the through hole of the insulating plug in sequence and then be electrically connected to the pole. In this way, the arrangement of the connector is relatively simple, and it is convenient to realize the electrical connection between the bus and the connector, so that the electrical connection between the bus and the pole can be realized, so that the pole can be led out to the side of the cover plate away from the battery shell through the bus. And this design method also provides the possibility of separate disassembly of the battery, which is conducive to improving the maintainability and recycling rate of the battery module using the battery.

[0020] In a possible implementation of the present application, the diameter of the through hole of the busbar is greater than or equal to the diameter of the through hole of the insulating plug. This helps to improve the efficiency of the connector passing through the through hole of the busbar and the through hole of the insulating plug in sequence, thereby helping to improve the efficiency of assembling the battery into a battery module.

[0021] In addition, in a possible implementation of the present application, the pole may further include a threaded hole, and the threaded hole of the pole is arranged opposite to the through hole of the insulating plug. The connector includes an external thread, and the connector can be screwed and locked with the threaded hole of the pole after passing through the through hole of the busbar and the through hole of the insulating plug. This is conducive to improving the contact reliability between the connector and the pole, and can improve the reliability of the electrical connection and mechanical connection between the busbar and the pole, thereby helping to improve the structural reliability of the battery module.

[0022] In a possible implementation of the present application, the through hole of the insulating plug may also be a threaded hole, and the connector may also be screwed and locked with the through hole of the insulating plug to improve the connection reliability between the connector and the battery. In addition, the pole may not be provided with a threaded hole, but only needs to make the connector reliably contact the pole, which is conducive to simplifying the processing technology of the pole.

[0023] In the present application, the busbar and the pole can also be electrically connected in other ways. In one possible implementation, the busbar includes a recessed portion and a connecting portion, the recessed portion is located in the through hole of the cover plate, the recessed portion abuts against the surface of another part of the pole that is away from the pole, and the connecting portion is located on the surface of the cover plate away from the battery shell. In addition, the battery module also includes an insulating plug, which is installed in the through hole of the cover plate, and the recessed portion is located between the insulating plug and the pole, so that the recessed portion of the busbar abuts against the pole. In this way, while realizing the electrical connection between the busbar and the pole, the connection method between the busbar and the pole can also be effectively simplified, thereby simplifying the structure of the battery. And this design method also provides the possibility of disassembling a single battery, which is conducive to improving the maintainability and recycling rate of the battery.

[0024] In order to achieve a detachable connection between the insulating plug and the through hole of the cover plate, in a possible implementation of the present application, the through hole of the cover plate is a threaded hole, the insulating plug includes an external thread, and the insulating plug and the through hole of the cover plate are screwed and locked, so that the insulating plug and the through hole of the cover plate are detachably connected by threaded connection, which is conducive to improving the convenience of connection between the two.

[0025] In a possible implementation of the present application, the end of the insulating plug facing away from the battery shell may also be provided with a screw-in groove, so as to facilitate screwing the insulating plug into the through hole of the cover plate or screwing the insulating plug out of the through hole.

[0026] In a possible implementation of the present application, along the arrangement direction from the cover plate to the battery shell, the length of the insulating plug may be less than or equal to the hole depth of the through hole of the cover plate, so that the insulating plug can be fully accommodated in the through hole of the cover plate by adjusting the size of the insulating plug, which can avoid the insulating plug being exposed and occupying the installation space of the battery module.

[0027] In a possible implementation of the present application, the diameter of a portion of the pole is smaller than the diameter of another portion of the pole, so that the area of ​​the pole used for connecting with the pole lug is larger, thereby improving the convenience of connecting the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0029] Figure 2 for Figure 1 AA cross-sectional view of the battery shown in;

[0030] Figure 3 A schematic structural diagram of an end portion of an insulating plug provided in an embodiment of the present application;

[0031] Figure 4 for Figure 2 An exploded view of the connection components of the battery shown in;

[0032] Figure 5 The embodiments of the present application include Figure 2 A schematic diagram of the structure of a battery pack of the battery shown;

[0033] Figure 6 Another schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0034] Figure 7 for Figure 6 BB cross-sectional view of the battery shown in;

[0035] Figure 8 The embodiments of the present application include Figure 6 A schematic diagram of the structure of a battery pack of the battery shown;

[0036] Fig. 9 A schematic diagram of the structure of an energy storage cabinet provided in an embodiment of the present application.

[0037] Reference numerals:

[0038] 1000-battery pack; 10001-housing; 100-battery module; 10-battery; 1-cover; 101-pole; 101a-part of the pole;

[0039] 101b- another part of the pole; 1011- threaded hole; 102- through hole; 1021- groove; 2- battery shell; 3- battery cell; 301- pole ear;

[0040] 4-connection assembly; 401-insulation plug; 4011-screw groove; 4012-through hole; 402-bus; 4021-through hole; 4022-recess;

[0041] 4023-connecting part; 403-connecting piece; 2000-energy storage cabinet. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted. The words expressing position and direction described in the embodiments of the present application are all illustrated by taking the accompanying drawings as examples, but changes may be made as needed, and the changes made are all included in the scope of protection of the present application. The drawings of the embodiments of the present application are only used to illustrate the relative position relationship, and they do not represent the true proportion.

[0043] It should be noted that specific details are described in the following description to facilitate understanding of the present application. However, the present application can be implemented in a variety of other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific implementation methods disclosed below.

[0044] In order to facilitate the understanding of the battery provided in the embodiments of the present application, its application scenario is first introduced below. During the use of electronic equipment, a power supply device is usually required to power it. At present, various types of electronic equipment, such as consumer electronic products (such as mobile phones, tablets or wearable devices) and electric vehicles, etc., can usually choose secondary batteries such as lithium-ion batteries, lead-acid batteries, sodium batteries, magnesium batteries, aluminum batteries and potassium batteries as power supply devices. In addition, batteries are also used as basic units for energy storage systems such as energy storage base stations to realize charging and discharging functions. In this application, secondary batteries (rechargeable batteries) are also called rechargeable batteries, power batteries or storage batteries, which refer to batteries that can be activated by charging after the battery is discharged and continue to be used. In the following embodiments of the present application, unless otherwise specified, the batteries mentioned refer to secondary batteries.

[0045] At present, according to the different power requirements in different application scenarios, multiple batteries are usually connected in series or in parallel to form a battery pack to provide suitable voltage, capacity and power. At present, the mainstream solution for connecting multiple batteries in the industry is laser welding, that is, the conduction of the circuit between batteries is achieved by welding the battery poles to the busbars. This connection solution has low cost and high production efficiency. However, since the laser welding process is irreversible, once multiple batteries are formed into a battery pack using this solution, it is impossible to disassemble and replace a single battery. If there is an abnormality in a single battery in the battery pack, the entire battery pack will be unusable, resulting in a waste of resources. In addition, the quality of laser welding will be affected by laser power, defocus, laser rate, busbar material, etc., and in the process of laser welding of batteries, there are also problems such as battery thermal shock, welding slag splashing, and stress that cannot be released after the battery pack is formed, which makes the quality of the formed battery pack uncontrollable.

[0046] In view of this, the battery provided by the present application is configured such that the pole is recessed into the battery shell, so that the batteries of the battery module are electrically connected through a bus bar detachably connected to the pole, thereby realizing detachable connection between the batteries, which is conducive to improving the maintainability and recycling rate of the battery module formed by connecting multiple batteries, so as to reduce the cost of the entire life cycle of the battery module, and further reduce the cost of the electronic device or energy storage system using the battery module. To facilitate the understanding of the battery provided in the embodiment of the present application, its specific structure is described in detail below in conjunction with the accompanying drawings.

[0047] Reference Figure 1 , Figure 1 A schematic diagram of the structure of a battery 10 provided in an embodiment of the present application. The battery 10 comprises a cover plate 1 and a battery shell 2, wherein the cover plate 1 is disposed on one end of the battery shell 2.

[0048] In addition, refer to Figure 2 , Figure 2 for Figure 1 AA cross-sectional view of the battery 10 shown in . The cover plate 1 includes two poles 101. For the convenience of explanation, the two poles 101 can be defined as a first pole and a second pole, respectively. Among them, the first pole is a positive pole, and the second pole is a negative pole, or the first pole is a negative pole, and the second pole is a positive pole. In addition, in the embodiment of the present application, the material of the first pole and the second pole is not limited, and the material of the first pole and the second pole can be the same, or the material of the first pole and the second pole is different.

[0049] Continue to refer to Figure 2 , the cover plate 1 further includes two through holes 102, and along the arrangement direction from the cover plate 1 to the battery shell 2, the two through holes 102 are arranged one by one with the two poles 101. Part 101a of each pole is located in the corresponding through hole 102 of the cover plate 1, and the other part 101b of each pole is located in the battery shell 2. In addition, as Figure 2 As shown, the surface of the other part 101b of the part 101a of each pole away from the pole is lower than the surface of the cover plate 1 away from the battery case 2. This can improve the sealing of the battery 10 to reduce the risk of leakage of the battery 10, and also help to avoid the risk of short circuit caused by the exposure of the pole 101, so as to improve the safety of the battery 10.

[0050] The battery 10 provided in the embodiment of the present application also includes a battery cell 3, which is contained in a battery shell 2. The battery cell 3 includes a tab 301. Specifically, the battery cell 3 includes a positive tab and a negative tab. The positive tab is electrically connected to the positive pole post, and the negative tab is electrically connected to the negative pole post. Among them, the positive tab and the positive pole post can be connected by welding, but not limited to, and the two can be directly connected or indirectly connected through a connector. Similarly, the negative tab and the negative pole post can also be connected by welding, and the two can be directly connected or indirectly connected through a connector.

[0051] You can continue to refer to Figure 2 In the embodiment of the present application, the diameter of the other part 101b of each pole is larger than the diameter of the part 101a of the pole. In this way, the area of ​​the pole 101 for connecting with the corresponding pole lug 301 can be larger, thereby improving the convenience of connecting the two.

[0052] Since the pole 101 of the battery 10 is recessed into the battery shell 2 in the embodiment of the present application, in order to make the pole 101 of the battery 10 play a connecting role, a connector electrically connected to the pole 101 can be provided to achieve the purpose of leading the pole 101 out of the battery shell 2. Figure 2In the battery 10 shown, a connection assembly 4 is also provided corresponding to each pole 101, and each connection assembly 4 is detachably connected to the cover plate 1. Since the connection relationship between each connection assembly 4 and the corresponding pole 101 is the same, Figure 2 Only one of the connection components 4 and the corresponding pole 101 are shown.

[0053] The connection assembly 4 includes an insulating plug 401, a busbar 402, and a connector 403, wherein the insulating plug 401 passes through the through hole 102, and the insulating plug 401 abuts against the surface of the part 101a of the pole away from the other part 101b of the pole. In addition, the insulating plug 401 and the through hole 102 are detachably connected. In a specific implementation, the through hole 102 may include an internal thread, and the insulating plug 401 may include an external thread, so that the external thread of the insulating plug 401 and the internal thread of the through hole 102 can be screwed and locked, so that the insulating plug 401 and the through hole 102 are detachably connected by threaded connection.

[0054] It is understandable that, along the arrangement direction of the cover plate 1 and the battery shell 2, the length of the insulating plug 401 may be less than or equal to the hole depth of the through hole 102, so that the insulating plug 401 can be completely accommodated in the through hole 102 of the cover plate 1 by adjusting the size of the insulating plug 401, which can prevent the insulating plug 401 from being exposed and occupying the installation space of the battery 10. In addition, in the embodiment of the present application, the material of the insulating plug 401 can be, but is not limited to, rubber, etc., so as to prevent the insulating plug 401 from being electrically connected to the pole 101.

[0055] In addition, in order to facilitate screwing the insulating plug 401 into the through hole 102, the end of the insulating plug 401 away from the battery shell 2 may also be provided with a screwing groove 4011. Figure 3 , Figure 3 A schematic diagram of the structure of the end of the insulating plug 401 provided in the embodiment of the present application. The screwing groove 4011 of the insulating plug 401 can be, for example, an inner hexagonal groove, so that the insulating plug 401 can be screwed into the above-mentioned Figure 2 The through hole 102 shown in FIG. 1 or the insulating plug 401 is screwed out of the through hole 102 to achieve a detachable connection between the insulating plug 401 and the through hole 102 .

[0056] The above embodiment is only an exemplary description of the specific implementation method of the detachable connection between the insulating plug 401 and the through hole 102. In other possible embodiments of the present application, the detachable connection between the insulating plug 401 and the through hole 102 can be achieved by interference fitting the insulating plug 401 and the through hole 102, and providing a pull-out piece and other structures on the insulating plug 401. Of course, any other possible setting method can also be used to achieve the detachable connection between the insulating plug 401 and the through hole 102. They will not be introduced one by one here, but they should all be understood to fall within the protection scope of the embodiments of the present application.

[0057] Reference Figure 4 , Figure 4 for Figure 2 The busbar 402 is located on the side of the cover plate 1 away from the battery housing 2, wherein the busbar 402 can be electrically connected to the pole 101 of the battery 10 and can play a role in electrically connecting the pole 101 of the battery 10 with other structures. Figure 4 As shown, the busbar 402 includes a through hole 4021, and the insulating plug 401 includes a through hole 4012. The through hole 4021 of the busbar 402 is arranged opposite to the through hole 4012 of the insulating plug 401, and the aperture of the through hole 4021 of the busbar 402 is greater than or equal to the aperture of the through hole 4012 of the insulating plug 401. In addition, in the embodiment of the present application, the connector 403 sequentially passes through the first through hole 4021 and the second through hole 4012 and then contacts the pole 101, thereby achieving electrical connection between the connector 403 and the pole 101.

[0058] In addition, the connector 403 can be used to press the busbar 402 against the insulating plug 401, so that the insulating plug 401 can support the busbar 402 and make the busbar 402 reliably contact the connector 403, so that the busbar 402 can achieve reliable electrical connection with the pole 101 through the connector 403. In the embodiment of the present application, there are many ways for the connector 403 to apply a pressing force to the busbar 402, such as Figure 2 In the battery shown, the pole 101 includes a threaded hole 1011, and the threaded hole 1011 of the pole 101 is arranged opposite to the through hole 4012 of the insulating plug 401. In addition, the connecting member 403 is a structural member including an external thread such as a bolt, so that the connection between the connecting member 403 and the pole 101 can be achieved by screwing and locking the connecting member 403 with the threaded hole 1011 of the pole 101, and at the same time, the connecting member 403 presses the bus 402 toward the insulating plug 401 to achieve reliable contact between the connecting member 403 and the bus 402.

[0059] It can be understood that in the embodiment of the present application, the pole 101 of the battery 10 is electrically connected to the bus 402 through the connector 403, which is beneficial to increase the contact area between the pole 101 and the bus 402, thereby increasing the flow area between the battery 10 and the bus 402, and reducing the continuous impedance between the battery 10 and the bus 402, thereby reducing the energy loss of the battery 10.

[0060] exist Figure 2 In the battery shown, the through hole 4021 of the busbar 402 and the through hole 4012 of the insulating plug 401 may both be light holes, so as to simplify the structure of the connection assembly 4. Alternatively, if the through hole 4021 of the busbar 402 is a light hole and the through hole 4012 of the insulating plug 401 is a threaded hole, the connector 403 may also be screwed and locked with the through hole 4012 of the insulating plug 401, which is conducive to improving the structural reliability of the connection assembly 4. In addition, when the through hole 4012 of the insulating plug 401 is a threaded hole, the pole 101 may not be provided with a threaded hole. In this case, it is only necessary to make the connector 403 able to reliably contact with the pole 101, which is conducive to simplifying the processing technology of the pole 101.

[0061] Reference Figure 5 , Figure 5 The embodiments of the present application include Figure 2 A schematic diagram of the structure of a battery module 100 of a battery 10 shown in FIG. The battery module 100 includes a plurality of batteries 10 arranged side by side. Figure 5 It can be seen that, by using the battery 10 provided in the above embodiment of the present application, the size of the busbar 402 and the number of through holes 4021 of the busbar 402 can be adjusted to achieve electrical connection between the poles 101 of any two adjacent batteries 10 by making the poles 101 of the two batteries 10 share a busbar 402, for example, the positive pole of one battery 10 in the two adjacent batteries 10 is electrically connected to the negative pole of the other battery 10 through the busbar 402, thereby realizing the series connection of the two batteries 10. In addition, the battery 10 in the battery module 100 can also be connected to an electrical device through the busbar 402. Since in the battery 10 provided in the embodiment of the present application, the connecting assembly 4 is detachably connected to the pole 101, it provides the possibility of separate disassembly and replacement of the battery 10 in the battery module 100, thereby improving the maintainability and recycling rate of the battery module 100, which can be conducive to reducing the cost of the full life cycle of the battery module 100.

[0062] Furthermore, since in the process of using the batteries 10 provided in the present application to form a battery module 100, the batteries 10 are electrically connected by mechanical connection, it can effectively avoid the influence of welding on the quality of the battery module 100, so that the quality of the battery module 100 can be controlled, thereby effectively improving the reliability of the structure and charging and discharging performance of the battery module 100.

[0063] It is worth mentioning that Figure 5 Only the case where two batteries 10 are connected in series is shown. When two or more batteries 10 are connected in series or in parallel or both in series and in parallel, all of them can be referred to. Figure 5 The battery 10 is connected in the manner shown in the figure, which will not be described in detail here.

[0064] Based on the design principle of the battery 10 provided in the above embodiment of the present application, some adaptive deformations can be made to the specific structure of the battery 10. Figure 6 , Figure 6 This is another schematic diagram of the structure of the battery 10 provided in the embodiment of the present application. The main difference from the battery 10 provided in the above embodiment is that: Figure 6 In the battery 10 shown, the connection assembly 4 only includes a bus bar 402 and an insulating plug 401 , which can simplify the structure of the battery 10 .

[0065] Figure 6 When the battery 10 is specifically configured, refer to Figure 7 , Figure 7 for Figure 6 The BB cross-sectional view of the battery 10 is shown in FIG. The hole wall of the through hole 102 of the cover plate 1 may be provided with a groove 1021, and part of the busbar 402 may be accommodated in the groove 1021. Figure 6 and Figure 7 The busbar 402 includes a recessed portion 4022 and a connecting portion 4023. The recessed portion 4022 is located in the through hole 102 of the cover plate 1, and the recessed portion 4022 abuts against the surface of the part 101a of the pole away from the other part 101b of the pole. In addition, the connecting portion 4023 is located on the surface of the cover plate 1 away from the battery shell 2, so that the pole 101 is led out to the outside of the battery shell 2 through the busbar 402, so as to realize the electrical connection between the pole 101 of the battery 10 and other structures.

[0066] in 6 and Figure 7 In the battery 10 shown, the insulating plug 401 is installed in the through hole 102 of the cover plate 1, and the insulating plug 401 and the through hole 102 are detachably connected. The connection method can refer to any of the above embodiments and will not be described in detail here.

[0067] It is understandable that in Figure 7In the battery 10 shown, since the recessed portion 4022 of the busbar 402 is located between the insulating plug 401 and the pole 101, the insulating plug 401 can press the recessed portion 4022 of the busbar 402 toward the pole 101 after being installed in the through hole 102, so that the recessed portion 4022 of the busbar 402 contacts the pole 101, thereby achieving electrical connection between the busbar 402 and the pole 101. Since in the battery 10, the pole 101 directly contacts the busbar 402, the contact area between the pole 101 and the busbar 402 is large, which is conducive to increasing the flow area between the battery 10 and the busbar 402, and reducing the continuous impedance between the battery 10 and the busbar 402, thereby reducing the energy loss of the battery 10.

[0068] Figure 6 and Figure 7 The other structures of the battery 10 shown can be arranged with reference to any of the above embodiments, and will not be described in detail here.

[0069] Reference Figure 8 , Figure 8 The embodiments of the present application include Figure 6 A schematic diagram of the structure of a battery module 100 of a battery 10 is shown. Figure 8 It can be seen that by using the battery 10 provided in the present application, the size of the busbar 402 can be adjusted so that the poles 101 of the two batteries 10 can be electrically connected by making the poles 101 of the two batteries 10 share one busbar 402, thereby realizing the electrical connection between the two batteries 10. In addition, the battery 10 in the battery module 100 can also be connected to electrical equipment and the like through the busbar 402. Since in the battery 10 provided in the embodiment of the present application, the connecting assembly 4 is detachably connected to the pole 101, it provides the possibility of separate disassembly and replacement of the battery 10 in the battery module 100, thereby improving the maintainability and recycling rate of the battery module 100, which can help reduce the cost of the full life cycle of the battery module 100.

[0070] Furthermore, since in the process of using the batteries 10 provided in the present application to form a battery module 100, the batteries 10 are electrically connected by mechanical connection, it can effectively avoid the influence of welding on the quality of the battery module 100, so that the quality of the battery module 100 can be controlled, thereby effectively improving the reliability of the structure and charging and discharging performance of the battery module 100.

[0071] It is worth mentioning that Figure 8 Only two batteries 10 are connected in series. When two or more batteries 10 are connected in series or in parallel or both, they can be referred to as Figure 8 The battery 10 is connected in the manner shown in the figure, which will not be described in detail here.

[0072] In addition, in the above embodiments of the present application, the battery 10 includes a connection component 4 as an example to introduce its structure and the connection of multiple batteries 10 to form a battery module 100. In some possible embodiments of the present application, the battery 10 includes a partial structure in the connection component 4, for example, the battery 10 includes an insulating plug 401, and the bus 402 and the connector 403 in the connection component 4 belong to the battery module 100 formed by assembling multiple batteries 10. Alternatively, in some other possible embodiments of the present application, the battery 10 does not include the connection component 4, and the connection component 4 belongs to the battery module 100 formed by assembling multiple batteries 10. The above is only some exemplary descriptions of the structure of the battery 10 and the battery module 100 provided in the present application. On this basis, the adaptive deformation of the structure of the battery 10 and the battery module 100 should be understood to fall within the protection scope of the present application.

[0073] The battery module 100 provided in the embodiment of the present application can form a battery pack 1000, and the battery pack 1000 can be applied to an energy storage system, which can include an energy storage converter and an energy storage cabinet. Fig. 9 , Fig. 9 A schematic diagram of the structure of an energy storage cabinet 2000 provided in an embodiment of the present application. The energy storage cabinet 2000 includes one or more battery packs 1000 , and the battery pack 1000 also includes a housing 10001 . The battery module 100 in the above embodiment can be accommodated in the housing 10001 .

[0074] In addition, the energy storage converter can be electrically connected to the battery pack 1000 of the energy storage cabinet 2000, and the energy storage converter is used to convert the AC power output by the external power supply into DC power and then provide it to the battery pack 1000, or convert the DC power from the battery pack 1000 into AC power and output it to an external device. Since the battery 10 of the battery module 100 in the battery pack 1000 provided in the embodiment of the present application can be disassembled and replaced individually, it can improve the maintainability and recycling rate of the battery pack 1000, thereby reducing the full life cycle cost of the battery pack 1000, which is conducive to reducing the cost of the energy storage system.

[0075] In addition, the energy storage system may also include a battery management system, which can effectively detect parameters such as the temperature, state of charge, and health status of the battery pack 1000 in the energy storage cabinet 2000, and can also effectively regulate the charging and discharging functions of the battery pack 1000, thereby ensuring the normal operation of the energy storage system.

[0076] The battery 10 provided in the above embodiment of the present application can also be applied to a power supply system, in which the battery 10 can also be provided in the form of a battery module 100 or a battery pack 1000. In addition, the power supply system can also include a power generation device. The power generation device is electrically connected to the battery 10, and the power generation device can be used to store the electric energy generated by the power generation device in the battery 10. By applying the above battery 10, the cost of the power supply system can be effectively reduced.

[0077] In a specific embodiment, the power supply system may be a large power station or a micro power station, wherein the micro power station may be located in an industrial park or a community. Alternatively, the power supply system may also be a household power supply system or a power supply system for equipment such as a vehicle.

[0078] The power generation equipment can be, but is not limited to, photovoltaic power generation equipment, wind power generation equipment, etc., and the embodiments of the present application do not limit the specific type of the power generation equipment. In addition, in practical applications, the power generation equipment and the battery 10 can also be connected through a distribution cabinet. The distribution cabinet may include a DC-AC conversion device, or may also include devices such as a transformer, so as to effectively transmit the electric energy generated by the power generation equipment to the battery 10 for storage. In the specific setting, the number and type of devices in the distribution cabinet can be reasonably set according to actual needs, and the embodiments of the present application do not limit this.

[0079] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery module, characterized in that: It comprises a plurality of batteries and a busbar, wherein the plurality of batteries are arranged side by side, each of the batteries comprises a cover plate and a battery shell, wherein the cover plate is arranged on the battery shell, wherein: The cover plate includes a pole and a through hole, a portion of the pole is located in the through hole of the cover plate and another portion of the pole is located in the battery shell, and a surface of the portion of the pole facing away from the other portion of the pole is lower than a surface of the cover plate facing away from the battery shell; In any two adjacent batteries, one pole of one battery is electrically connected to one pole of the other battery through the bus bar.

2. The battery module according to claim 1, characterized in that: The diameter of another portion of the pole is greater than the diameter of the portion of the pole; The battery module also includes an insulating plug and a connecting piece, the insulating plug passes through the through hole of the cover plate, and the insulating plug abuts against the surface of a portion of the pole that is away from another portion of the pole; the bus bar includes a through hole, and the insulating plug includes a through hole, the through hole of the bus bar and the through hole of the insulating plug are arranged opposite to each other, and the connecting piece passes through the through hole of the bus bar and the through hole of the insulating plug in sequence to be electrically connected to the pole.

3. The battery module according to claim 2, characterized in that: The aperture of the through hole of the bus bar is greater than or equal to the aperture of the through hole of the insulating plug.

4. The battery module according to claim 2 or 3, characterized in that: The pole comprises a threaded hole, and the threaded hole of the pole is arranged opposite to the through hole of the insulating plug; the connecting piece comprises an external thread, and the connecting piece is screwed and locked with the threaded hole of the pole.

5. The battery module according to any one of claims 2 to 4, characterized in that: The through hole of the insulating plug is a threaded hole, and the connecting piece is screwed and locked with the through hole of the insulating plug.

6. The battery module according to claim 1, characterized in that: The busbar comprises a recessed portion and a connecting portion, wherein the recessed portion is located in the through hole of the cover plate, the recessed portion abuts against a surface of a portion of the pole away from another portion of the pole, and the connecting portion is located on a surface of the cover plate away from the battery shell; The battery module further includes an insulating plug, which is installed in the through hole of the cover plate, and the recessed portion is located between the insulating plug and the pole.

7. The battery module according to any one of claims 2 to 6, characterized in that: The through hole of the cover plate is a threaded hole, the insulating plug comprises an external thread, and the insulating plug is screwed and locked with the through hole of the cover plate.

8. The battery module according to claim 7, characterized in that: The end of the insulating plug facing away from the battery shell further includes a screw-on groove.

9. The battery module according to any one of claims 2 to 8, characterized in that: Along the arrangement direction from the cover plate to the battery shell, the length of the insulating plug is less than or equal to the hole depth of the through hole of the cover plate.

10. The battery module according to any one of claims 1 to 9, characterized in that: The battery further comprises a battery cell, which is accommodated in the battery shell; the battery cell comprises a pole ear, and another part of the pole is welded to the pole ear.

11. A battery pack, characterized in that: The invention comprises a housing and a battery module according to any one of claims 1 to 10, wherein the battery module is accommodated in the housing.

12. An energy storage system, characterized in that: It comprises an energy storage inverter and an energy storage cabinet, wherein the energy storage cabinet comprises one or more battery packs as claimed in claim 11, and the energy storage inverter is electrically connected to the energy storage cabinet, and is used to convert the alternating current output by an external power supply into direct current and then provide it to the energy storage cabinet, or to convert the direct current from the energy storage cabinet into alternating current and output it to an external device.

13. A battery, characterized in that: It includes a cover plate, a battery shell and a battery cell, wherein the battery cell is accommodated in the battery shell, and the cover plate is disposed on the battery shell, wherein: The cover plate includes a pole and a through hole, part of the pole is located in the through hole of the cover plate and another part of the pole is located in the battery shell, a surface of the part of the pole away from the other part of the pole is lower than a surface of the cover plate away from the battery shell; the other part of the pole is welded to the pole ear of the battery cell.

14. The battery according to claim 13, characterized in that The battery further includes an insulating plug, which passes through the through hole of the cover plate and abuts against a surface of a portion of the electrode post which faces away from another portion of the electrode post.

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