Battery, battery module and energy storage system

Abstract

The utility model discloses a battery, a battery module and an energy storage system, the battery comprises a shell, a battery cell, a top cover and a collector plate, the battery cell is provided with a first tab area and a second tab area, the first tab area and the second tab area are positioned on the same end face of the battery cell, and a gap is formed between the first tab area and the second tab area; the current collector comprises an insulator, a first current collector and a second current collector, the first current collector and the second current collector are separated and connected together through the insulator to form a current collector assembly, the current collector assembly is located between the battery cell and the top cover, and the first current collector and the second current collector are insulated; the first current collector is arranged above the first tab area, the second current collector is arranged above the second tab area, the first current collector is electrically connected with the first tab area, the second current collector is electrically connected with the second tab area, the first current collector is further electrically connected with the first pole, the second current collector is further electrically connected with the second pole, and the top cover covers the opening of the shell.

Description

Technical Field

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

[0002] The battery is a main energy storage component. Specifically, the battery includes a shell, a battery cell disposed in the shell, a current collecting plate, and a top cover matched with an opening of the shell. The tabs of the battery cell are electrically connected to the current collecting plate.

[0003] In the related art, since the positive electrode tab and the negative electrode tab on the battery cell are located at opposite ends of the battery cell in the axial direction, current collecting plates need to be provided at both ends of the battery cell, which results in a larger space for the battery in the axial direction of the battery cell, thereby affecting the energy density of the battery. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a battery, a battery module and an energy storage system, which can improve the energy density of the battery.

[0005] In order to solve the above technical problems, in a first aspect, the utility model provides a battery, comprising a shell, a battery cell, a top cover, and a current collecting plate, wherein the battery cell is installed in the shell, and the battery cell has a first pole lug area and a second pole lug area, wherein the first pole lug area and the second pole lug area are located on the same end surface of the battery cell, and there is a gap between the first pole lug area and the second pole lug area;

[0006] The current collecting plate comprises an insulator, a first current collector and a second current collector, the first current collector and the second current collector are separated and connected together through the insulator to form a current collecting plate assembly, the current collecting plate assembly is located between the battery cell and the top cover, and the first current collector and the second current collector are insulated;

[0007] The first current collector is arranged above the first pole lug area, the second current collector is arranged above the second pole lug area, the first current collector is electrically connected to the first pole lug area, the second current collector is electrically connected to the second pole lug area, the first current collector is also electrically connected to the first pole, the second current collector is also electrically connected to the second pole, and the top cover covers the opening of the shell.

[0008] By making the first pole lug area and the second pole lug area both located on the same end face of the battery cell, and the current collecting plate including the first current collector and the second current collector which are arranged on the insulator and insulated from each other, the electrical connection between the first pole lug area and the first pole column and the second pole lug area and the second pole column is achieved, thereby avoiding the need to respectively arrange two current collecting plates at both ends of the battery cell, thereby reducing the axial space of the battery in the battery cell and improving the energy density of the battery.

[0009] In a possible implementation manner, the insulator is injection molded or snap-fitted with the first current collector and the second current collector to form an integrated current collecting plate.

[0010] In this way, the setting of an integrated current collecting plate is achieved, simplifying the assembly process of the battery.

[0011] In a possible implementation, the first current collector and the first pole lug region, and the second current collector and the second pole lug region are fixed by laser welding, ultrasonic welding, or resistance welding.

[0012] In this way, the first electrode tab region and the first current collector can be welded and fixed, and the second electrode tab region and the second current collector can be welded and fixed.

[0013] In a possible implementation, the first pole is located at the geometric center of the top cover, and the first pole is laser welded, friction welded or riveted to the first current collector.

[0014] In this way, the first pole and the second pole can be quickly distinguished.

[0015] In a possible implementation, a first vent hole is provided on the insulator;

[0016] The first current collector and the second current collector are both provided with a plurality of second vent holes;

[0017] A plurality of grooves are arranged on a surface of the insulator facing the top cover to form a ventilation channel between the insulator and the top cover.

[0018] Since there is a ventilation channel between the insulator and the top cover, and a first ventilation hole is provided on the insulator, on the one hand, during liquid injection, the electrolyte can flow between the top cover and the insulator and between the battery cell and the top cover, thereby improving the liquid injection effect of the battery; on the other hand, by providing a ventilation channel between the insulator and the top cover, the gas can flow between the collecting plate and the top cover, thereby improving the air permeability between the collecting plate and the top cover, and reducing the risk of thermal runaway of the battery; on the other hand, by providing the first ventilation hole on the insulator, air can be passed between the battery cell and the top cover, thereby allowing the gas generated by the battery cell to diffuse to the top cover through the first ventilation hole, thereby increasing the diffusion speed and efficiency of the gas generated by the battery cell, and further reducing the risk of thermal runaway of the battery.

[0019] In a possible implementation, the first mounting hole and the second mounting hole are respectively located on two opposite sides of a geometric center of the insulator, and the plurality of first ventilation holes are located between the first mounting hole and the second mounting hole.

[0020] Since the gas generated by the battery cell during the cycle is concentrated near the central axis, the gas generated by the battery cell can be quickly diffused by locating the plurality of first vent holes between the first mounting hole and the second mounting hole, thereby further ensuring the safety of battery use.

[0021] In a possible implementation manner, the plurality of first ventilation holes are symmetrically arranged about a geometric center of the insulator.

[0022] By arranging the plurality of first vent holes symmetrically about the geometric center of the insulator, the uniformity of gas diffusion generated by the first vent holes on the battery cell can be improved, thereby further reducing the risk of thermal runaway of the battery.

[0023] In a possible implementation, a plurality of second ventilation holes are disposed on the first current collector and the second current collector.

[0024] By arranging a plurality of second vent holes on both the first current collector and the second current collector, the gas generated at the positions corresponding to the battery cells covered by the first pole lug area and the second pole lug area can be quickly diffused, thereby improving the safety of battery use. At the same time, when the battery is injected with liquid, the electrolyte can be diffused through the first vent holes, thereby improving the effect of battery injection.

[0025] In a possible implementation manner, a plurality of grooves are provided on a surface of the insulator facing the top cover to form the ventilation channel between the insulator and the top cover.

[0026] When the surface of the insulator facing the top cover contacts the top cover, a ventilation channel is formed between the groove and the top cover, and the ventilation channel can allow both gas and electrolyte to pass through. In addition, the groove structure is simple, which is easy to design and process. At the same time, when the surface of the insulator facing the top cover is connected to the top cover, the stability of the installation between the insulator and the top cover can also be guaranteed.

[0027] In a possible implementation, a limiting structure is provided at the geometric center of the insulator;

[0028] The first current collector comprises a current collecting portion and an extending portion connected to each other, the current collecting portion is installed in the first mounting hole and connected to the first pole lug region of the battery cell, and the extending portion extends toward the limiting structure and is at least partially located in the limiting structure;

[0029] The battery further includes a first pole, which extends into the limiting structure toward the end of the battery cell and is connected to the extension portion.

[0030] Since the limiting structure is arranged at the geometric center of the insulator and at least a part of the extension portion is located in the limiting structure, the first pole extends into the limiting structure toward the end of the battery cell and is connected to the extension portion. Therefore, the first pole lug area of ​​the battery cell is electrically connected to the first pole through the collecting portion and the extension portion. That is to say, the current on the first pole lug area of ​​the battery cell can be respectively discharged to the first pole through the collecting portion and the extension portion.

[0031] In addition, since the limiting structure is arranged at the geometric center of the insulator and the first pole extends into the limiting structure toward the end of the battery cell, the first pole is arranged at the geometric center of the insulator. Therefore, during the battery assembly process, the position where the first pole is to be installed can be quickly identified without adding a process for distinguishing the positions of the first pole ear area and the first current collector, thereby improving the efficiency and accuracy of the battery assembly. During the use of the battery, since the first pole is located at the geometric center of the top cover, the situation where the first pole is connected to the external electrode in reverse can be avoided to a large extent.

[0032] In a possible implementation, a first countersunk hole is formed on an end surface of the first pole facing away from the battery cell, and the end of the first pole facing the battery cell is fixed to the extension portion by penetration welding.

[0033] A first countersunk hole is formed through the end surface of the first pole away from the battery core, thereby reducing the thickness of the first pole in the axial direction of the first pole, thereby facilitating welding and fixing of the first pole and the extension portion.

[0034] In addition, since penetration welding has the advantages of high welding strength, good weld quality, and fast welding speed, the end of the pole facing the battery cell and the extension portion are fixed by penetration welding, which can improve the efficiency of fixing the first pole and the extension portion, and at the same time can improve the welding strength between the first pole and the extension portion.

[0035] In a possible implementation, the battery further includes a second electrode;

[0036] The second pole is integrally formed with the second current collector, or the second pole is penetrate-welded to the second current collector by laser welding, friction welding or resistance welding.

[0037] Since the second pole and the second current collector are integrally formed, the number of assembled components of the battery is reduced, the assembly process of the battery is simplified, and the assembly efficiency of the battery is improved.

[0038] In a possible implementation, the battery further includes a second electrode;

[0039] A second countersunk hole is formed on the end surface of the second pole away from the battery cell, and the end surface of the second pole facing the battery cell is fixed to the second current collector by penetration welding.

[0040] The second pole and the second current collector are fixed by penetration welding, which can ensure the connection stability between the second pole and the second current collector. In addition, when the battery is recycled, if the second pole or the second current collector fails or is damaged, only the undamaged second pole or the second current collector needs to be recycled, which improves the recycling effect of the battery.

[0041] In a possible implementation manner, a surface of the first current collector facing the battery core and a surface of the second current collector facing the battery core are flush.

[0042] Since the surface of the first current collector facing the battery cell needs to be laser welded and fixed to the first pole, and the surface of the second current collector facing the battery cell needs to be laser welded and fixed to the second pole, when the surface of the first current collector facing the battery cell and the surface of the second current collector facing the battery cell are flush, the welding effect of the first current collector and the second current collector can be improved.

[0043] In a second aspect, the utility model further provides a battery module, comprising the battery described in the first aspect.

[0044] Since the battery module includes the battery in the first aspect, the safety of the battery module is improved.

[0045] In a third aspect, the utility model further provides an energy storage system, comprising the battery module described in the second aspect.

[0046] Since the energy storage system includes the battery module in the second aspect, the stability of the operation of the energy storage system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 A schematic diagram of the assembly structure of a battery provided in an embodiment of the utility model;

[0049] Figure 2 A partial exploded view of a battery provided in an embodiment of the utility model;

[0050] Figure 3 An exploded view of a current collecting plate provided in an embodiment of the utility model;

[0051] Figure 4 An exploded view of the current collecting plate and the first pole provided in an embodiment of the utility model;

[0052] Figure 5 A schematic diagram of the structure of the current collecting plate and the first pole assembly provided by an embodiment of the utility model;

[0053] Figure 6 for Figure 5 Sectional view at AA in the middle;

[0054] Figure 7 A schematic structural diagram of a current collecting plate provided by an embodiment of the utility model from one perspective;

[0055] Figure 8 for Figure 5 One of the cross-sectional views at the middle BB;

[0056] Fig. 9 for Figure 5 The second cross-sectional view at the middle BB;

[0057] Fig.10 A schematic structural diagram of a current collecting plate provided by an embodiment of the utility model from another perspective;

[0058] Fig.11 A schematic diagram of the structure of a battery module provided by an embodiment of the utility model;

[0059] Fig.12 A schematic diagram of the structure of an energy storage system provided in an embodiment of the utility model.

[0060] Description of reference numerals:

[0061] 100-battery; 110-housing; 120-cell; 121-first pole lug area; 122-second pole lug area; 130-top cover; 140-collector plate; 141-insulator; 1411-first mounting hole; 1412-second mounting hole; 1413-first vent hole; 1414-groove; 1415-limiting structure; 142-first current collector; 1421-current collector; 1422-extension portion; 143-second current collector; 151-first pole; 1511-first countersunk hole; 152-second pole; 1521-second countersunk hole;

[0062] 200-battery module;

[0063] 300-Energy storage system; 310-Electric energy conversion device; 320-Electricity load. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0065] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0066] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0067] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0068] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0069] The present application is described in detail below through specific embodiments:

[0070] See also Figure 1 , Figure 2 and Figure 3The embodiment of the present application provides a battery 100, which includes a shell 110, a battery cell 120, a top cover 130 and a current collecting plate 140, wherein the shell 110 has an open accommodating cavity; the battery cell 120 is arranged in the accommodating cavity; the top cover 130 covers the opening; the battery cell 120 is installed in the shell, and the battery cell 120 has a first pole ear area 121 and a second pole ear area 122, the first pole ear area 121 and the second pole ear area 122 are located on the same end surface of the battery cell 120, there is a gap between the first pole ear area 121 and the second pole ear area 122 and they are symmetrical about the central axis of the battery cell 120; the current collecting plate includes an insulator 141, a first current collector 142 and a second current collector 143, the insulator 141 is located Between the battery cell 120 and the top cover, a first mounting hole 1411 and a second mounting hole 1412 are provided on the insulator 141, the first current collector 142 is installed in the first mounting hole 1411, and the second current collector 143 is installed in the second mounting hole 1412, and the first mounting hole 1411 and the second mounting hole 1412 are insulated; the first current collector 142 is arranged above the first pole lug area 121, and the second current collector 143 is arranged above the second pole lug area 122, the first current collector 142 is electrically connected to the first pole lug area 121, the second current collector 143 is electrically connected to the second pole lug area 122, the first current collector 142 is also electrically connected to the first pole 151, and the second current collector 143 is also electrically connected to the second pole 152.

[0071] Among them, one of the first pole lug area 121 and the second pole lug area 122 is a positive pole lug, and the other is a negative pole lug, and one of the first pole column 151 and the second pole column 152 is a positive pole lug, and the other is a negative pole column. The insulation between the first mounting hole 1411 and the second mounting hole 1412 means that the first mounting hole 1411 and the second mounting hole 1412 are not connected, and the two are independent holes, and there is a gap between the first mounting hole 1411 and the second mounting hole 1412.

[0072] In addition, the above-mentioned battery 100 includes but is not limited to cylindrical batteries and square batteries. In this embodiment, the structure of the collecting plate 140 is mainly described in detail by taking the cylindrical battery as an example. When the battery 100 is a cylindrical battery, the insulator 141 is a circular structure corresponding to the cylindrical shell 110.

[0073] The positions of the first mounting hole 1411 and the second mounting hole 1412 correspond to the positions of the first pole ear area 121 and the second pole ear area 122 of the battery cell 120, respectively. In this embodiment, the first pole ear area 121 and the second pole ear area 122 of the battery cell 120 are located on the end surface of the battery cell 120 facing the top cover 130, and the first pole ear area 121 and the second pole ear area 122 are respectively located on both sides of the center line of the end surface of the battery cell 120 facing the top cover 130. The first pole ear area 121 and the second pole ear area 122 both include multiple layers of pole ears. The first pole ear area 121 and the second pole ear area 122 close to the central axis of the battery cell 120 are located on the end surface of the battery cell 120 facing the top cover 130. The height of the pole lugs in the lug area 122 along the axial direction of the battery cell 120 is relatively low, while the height of the pole lugs in the first pole lug area 121 and the second pole lug area 122 away from the central axis of the battery cell 120 are relatively high. In this way, when the pole lugs of the multi-layer first pole lug area 121 are bent toward the central axis of the battery cell 120, the ends of the pole lugs of the multi-layer first pole lug area 121 after bending can be flush or approximately flush. Similarly, when the pole lugs of the multi-layer second pole lug area 122 are bent toward the central axis of the battery cell 120, the ends of the pole lugs of the multi-layer second pole lug area 122 after bending can be flush or approximately flush.

[0074] Since the insulator 141 is located between the top cover 130 and the battery cell 120, at least a portion of the first current collector 142 is installed in the first installation hole 1411 and is connected to the first pole lug area 121 of the battery cell 120, and at least a portion of the second current collector 143 is installed in the second installation hole 1412 and is connected to the second pole lug area 122 of the battery cell 120. Therefore, the current collecting plate 140 is arranged in the shell 110, and because the first current collector 142 and the second current collector 143 are insulated, it is possible to avoid contact between the first current collector 142 and the second current collector 143, thereby preventing a short circuit between the first pole lug area 121 and the second pole lug area 122.

[0075] In addition, since the first pole lug region 121 and the second pole lug region 122 are located on the same end surface of the battery cell 120, there is a gap between the first pole lug region 121 and the second pole lug region 122 and they are symmetrical about the central axis of the battery cell 120, the first current collector 142 is installed in the first installation hole 1411, and the second current collector 143 is installed in the second installation hole 1412. There is a gap between the first installation hole 1411 and the second installation hole 1412, and the first current collector 142 and the second current collector 143 are insulated. Therefore, when the first pole lug region 121 is set, A current collecting plate is arranged on the end surface of the battery cell 120 having the first and second pole lug areas 121 and 122, and the current collecting plate includes an insulating first current collector 142 and a second current collector 143, which can realize the electrical connection between the first pole lug area 121 and the first pole 151, and the electrical connection between the second pole lug area 122 and the second pole 152. Compared with the solution of respectively arranging pole lugs at both ends of the battery cell 120 in the related art, the number of current collecting plates is reduced, and the installation space occupied by the shell in the axial direction of the battery cell 120 is reduced, thereby improving the energy density of the battery.

[0076] In addition, it should be noted that the first pole lug region 121 and the second pole lug region 122 are both fan-shaped, and the fan-shaped is symmetrical about the central axis of the battery cell 120. Similarly, the first current collector 142 is a fan-shaped corresponding to the first pole lug region 121, and the second current collector 143 is a fan-shaped corresponding to the second pole lug region 122.

[0077] The above-mentioned insulator 141, the first current collector 142 and the second current collector 143 can also be understood as the first current collector 142 and the second current collector 143 are separated and connected together through the insulator 141 to form a current collecting plate assembly, and the current collecting plate assembly composed of the insulator 141, the first current collector 142 and the second current collector 143 is located between the battery cell 120 and the top cover 130, and the current collecting plate assembly here is also the above-mentioned current collecting plate 140.

[0078] In some possible embodiments, the insulator 141 and the first current collector 142 and the second current collector 143 are injection molded or assembled (eg, snap-fitted, riveted, etc.) to form an integrated current collecting plate, thereby realizing the setting of an integrated current collecting plate and facilitating the assembly of the current collecting plate.

[0079] In some possible embodiments, the first current collector 142 and the first pole lug region 121, as well as the second current collector 143 and the second pole lug region 122 are fixed by laser welding, ultrasonic welding or resistance welding, thereby achieving electrical connection between the first current collector 142 and the first pole lug, as well as electrical connection between the second current collector 143 and the second pole lug.

[0080] Among them, the implementation method of electrical connection between the first current collector 142 and the first pole lug area 121 includes but is not limited to the connection method given above. Similarly, the implementation method of electrical connection between the second current collector 143 and the second pole lug area 122 includes but is not limited to the connection method given above.

[0081] In some possible embodiments, the first pole 151 is located at the geometric center of the top cover, and the first pole 151 is laser welded, friction welded, or riveted to the first current collector 142 , thereby facilitating rapid identification of the first pole 151 and the second pole 152 .

[0082] The welding between the first pole 151 and the first current collector 142 includes but is not limited to the above-mentioned welding methods.

[0083] In some possible embodiments, a plurality of first ventilation holes 1413 are further disposed on the insulator 141 . The insulator 141 is located between the top cover 130 and the battery cell 120 and has a ventilation channel between the insulator 141 and the top cover 130 .

[0084] Since there is a ventilation channel between the insulator 141 and the top cover 130, and a first ventilation hole 1413 is provided on the insulator 141, on the one hand, during liquid injection, the electrolyte can flow between the top cover 130 and the insulator 141 and between the battery cell 120 and the top cover 130, thereby improving the liquid injection effect of the battery 100. On the other hand, by providing a ventilation channel between the insulator 141 and the top cover 130, the gas can flow between the collecting plate 140 and the top cover 130, thereby improving the air permeability between the collecting plate 140 and the top cover 130 and reducing the risk of thermal runaway of the battery 100. On the other hand, by providing the first ventilation hole 1413 on the insulator 141, air can be passed between the battery cell 120 and the top cover 130, so that the gas generated by the battery cell 120 can diffuse to the top cover 130 through the first ventilation hole 1413, thereby increasing the diffusion speed and efficiency of the gas generated by the battery cell 120 and further reducing the risk of thermal runaway of the battery 100.

[0085] In addition, the number of the above-mentioned first ventilation holes 1413 is greater than or equal to two. When the number of the first ventilation holes 1413 is small, for example, when there are two first ventilation holes 1413, the area of ​​the first ventilation holes 1413 is larger. In addition, there is no limitation on the shape of the first ventilation holes 1413. For example, the first ventilation holes 1413 are holes in the shape of square holes, circular holes, elliptical holes, etc.

[0086] It should be noted that the above-mentioned first current collector 142 and the second current collector 143 are insulated, and the method of achieving the insulation of the first current collector 142 and the second current collector 143 includes but is not limited to completely closing the hole walls of the first mounting hole 1411 and the second mounting hole 1412, and the first current collector 142 is installed in the first mounting hole 1411, and the second current collector 143 is installed in the second mounting hole 1412, or, a partition protrusion is protruded on the insulator 141, and the partition protrusion is located between the first current collector 142 and the second current collector 143.

[0087] In some possible embodiments, see Figure 3 The first mounting hole 1411 and the second mounting hole 1412 are respectively located on opposite sides of the geometric center of the insulator 141 , and the plurality of first ventilation holes 1413 are located between the first mounting hole 1411 and the second mounting hole 1412 .

[0088] Since the first pole lug region 121 and the second pole lug region 122 of the battery cell 120 are respectively located on opposite sides of the central axis of the battery cell 120 , the first pole lug region 121 can be welded to the first current collector 142 installed in the first mounting hole 1411 and the second pole lug region 122 can be welded to the second current collector 143 installed in the second mounting hole 1412 through the first mounting hole 1411 and the second mounting hole 1412 are respectively located on opposite sides of the geometric center of the insulator 141 .

[0089] In addition, since the gas generated by the battery cell 120 during the cycle is concentrated near the central axis, the gas generated by the battery cell 120 can be quickly diffused by locating the plurality of first vent holes 1413 between the first mounting hole 1411 and the second mounting hole 1412, thereby further ensuring the safety of the battery 100.

[0090] In some possible embodiments, see Figure 3 , multiple first ventilation holes 1413 are symmetrically arranged about the geometric center of the insulator 141.

[0091] The geometric center of the insulator 141 is coaxial with the central axis of the battery cell 120. Figure 3 The position indicated by the dotted line in A1.

[0092] For example, when there are two first ventilation holes 1413 , the two first ventilation holes 1413 are symmetrical about the geometric center of the insulator 141 , and the central angle between the centers of the two first ventilation holes 1413 is 180°.

[0093] By arranging the plurality of first vent holes 1413 symmetrically about the geometric center of the insulator 141 , the uniformity of gas diffusion generated by the first vent holes 1413 on the battery cell 120 can be improved, thereby further reducing the risk of thermal runaway of the battery 100 .

[0094] In addition, when the electrolyte is injected, the electrolyte can diffuse through the first vent hole 1413, thereby improving the injection effect of the battery 100.

[0095] In another possible embodiment, there are a large number of first ventilation holes 1413 , and the multiple first ventilation holes 1413 form multiple strip structures, and the multiple strip structures are parallel or crossed to improve the uniformity and rapidity of gas diffusion by the multiple first ventilation holes 1413 .

[0096] In some possible embodiments, a plurality of second ventilation holes (not shown in the drawings) are disposed on the first current collector 142 and the second current collector 143 .

[0097] The plurality of second ventilation holes may be distributed at the edges, the middle, etc. of the first current collector 142 and the second current collector 143 .

[0098] By providing a plurality of second vent holes on both the first current collector 142 and the second current collector 143, the gas generated at the positions corresponding to the battery cells 120 covered by the first pole lug area 121 and the second pole lug area 122 can be quickly diffused, thereby improving the safety of the battery 100. At the same time, when the battery 100 is injected with liquid, the electrolyte can be diffused through the first vent hole 1413, thereby improving the injection effect of the battery 100.

[0099] In some possible embodiments, see Figure 3 A plurality of grooves 1414 are provided on the surface of the insulator 141 facing the top cover 130 to form a ventilation channel between the insulator 141 and the top cover 130 .

[0100] When the surface of the insulator 141 facing the top cover 130 is in contact with the top cover 130, a ventilation channel is formed between the groove 1414 and the top cover 130, and the ventilation channel can allow both gas and electrolyte to pass through. In addition, the groove 1414 has a simple structure and is easy to design and process. At the same time, when the surface of the insulator 141 facing the top cover 130 is connected to the top cover 130, the stability of the installation between the insulator 141 and the top cover 130 can also be ensured.

[0101] There is no strict limitation on the width, shape, and setting position of the groove 1414. For example, a plurality of grooves 1414 are provided between the four edges of the insulator 141 and the first mounting hole 1411 and the second mounting hole 1412, and the grooves 1414 penetrate the outer peripheral wall of the insulator 141 and the hole walls of the first mounting hole 1411 and the second mounting hole 1412. The surface of the first current collector 142 in the first mounting hole 1411 facing the top cover 130 is lower than the surface of the insulator 141 facing the top cover 130, and the surface of the second current collector 143 in the second mounting hole 1412 facing the top cover 130 is lower than the surface of the insulator 141 facing the top cover 130. In this way, when the surface of the insulator 141 facing the top cover 130 is tightly fitted with the top cover 130, the gas or electrolyte can diffuse between the insulator 141 and the top cover 130 through the grooves 1414.

[0102] In some possible embodiments, see Figure 3 , Figure 4 and Figure 5 A limiting structure 1415 is provided at the geometric center of the insulator 141; the first current collector 142 includes a current collecting portion 1421 and an extension portion 1422 which are connected to each other, the current collecting portion 1421 is installed in the first installation hole 1411, and the extension portion 1422 extends toward the limiting structure 1415 and is at least partially located in the limiting structure 1415; the battery 100 also includes a first pole 151, which extends into the limiting structure 1415 toward the end of the battery cell 120 and is connected to the extension portion 1422.

[0103] Since the limiting structure 1415 is arranged at the geometric center of the insulator 141, and at least a part of the extension portion 1422 is located in the limiting structure 1415, the first pole 151 extends into the limiting structure 1415 toward the end of the battery cell 120 and is connected to the extension portion 1422. Therefore, the first pole lug area 121 of the battery cell 120 is electrically connected to the first pole 151 through the collecting portion 1421 and the extension portion 1422. That is to say, the current on the first pole lug area 121 of the battery cell 120 can be respectively discharged to the first pole 151 through the collecting portion 1421 and the extension portion 1422.

[0104] In addition, since the limiting structure 1415 is arranged at the geometric center of the insulator 141, the first pole 151 extends into the limiting structure 1415 toward the end of the battery cell 120. Therefore, the first pole 151 is arranged at the geometric center of the insulator 141. Therefore, during the assembly process of the battery 100, the position where the first pole 151 is to be installed can be quickly identified, and there is no need to add a process for distinguishing the positions of the first pole ear area 121 and the first current collector 142, thereby improving the efficiency and accuracy of the assembly of the battery 100. When the battery 100 is in use, since the first pole 151 is located at the geometric center of the top cover 130, the situation where the first pole 151 is connected to the external electrode in reverse can be avoided to a large extent.

[0105] It should be noted here that the above-mentioned limiting structure 1415 can be a blind hole or a through hole, and the surface of the collecting portion 1421 protrudes toward the surface of the battery cell 120 and the surface of the insulator 141 toward the battery cell 120, so as to facilitate the welding of the collecting portion 1421 and the first pole ear area 121. In addition, optionally, taking the limiting structure 1415 as a limiting through hole as an example, the extension portion 1422 is located at the end of the limiting through hole facing the battery cell 120, or, a supporting plate is provided on the insulator 141, and the supporting plate is located at the end of the limiting through hole facing the battery cell 120, and a through hole that is connected to and coaxial with the limiting through hole is provided on the supporting plate, and the extension portion 1422 located in the limiting through hole is located in contact with the surface of the top cover 130 toward one side of the battery cell 120, so that the supporting plate supports the extension portion 1422, thereby ensuring the welding effect between the extension portion 1422 and the first pole 151.

[0106] Typically, the first pole 151 and the first current collector 142 are fixed by welding. There are multiple specific welding processes. For example, the process for welding the first pole 151 and the first current collector 142 includes but is not limited to fusion welding (such as gas welding, arc welding, electroslag welding, plasma arc welding, electron beam welding, laser welding, etc.), pressure welding (such as resistance welding, friction welding, cold pressure welding, diffusion welding, etc.), etc. This embodiment mainly takes penetration welding as an example for detailed description.

[0107] In some possible embodiments, in combination with reference Figure 4 , Figure 5 and Figure 6 A first countersunk hole 1511 is formed on the end surface of the first pole 151 facing away from the battery cell 120 , and the end of the first pole 151 facing the battery cell 120 is penetrated and fixed to the extension portion 1422 by welding.

[0108] A first countersunk hole 1511 is formed through the end surface of the first pole 151 away from the battery cell 120 , thereby reducing the thickness of the first pole 151 in the axial direction of the first pole 151 , thereby facilitating welding and fixing of the first pole 151 and the extension portion 1422 .

[0109] In addition, since penetration welding has the advantages of high welding strength, good weld quality, and fast welding speed, the end of the first pole 151 facing the battery cell 120 is fixed to the extension portion 1422 by penetration welding, which can improve the efficiency of fixing the first pole 151 and the extension portion 1422, and at the same time can improve the welding strength between the first pole 151 and the extension portion 1422.

[0110] After completing the penetration welding of the first pole 151 and the extension portion 1422, the first countersunk hole 1511 can be closed, such as by pouring glue into the first countersunk hole 1511, or welding an aluminum cover at the opening of the first countersunk hole 1511 to close the first countersunk hole 1511. Of course, the first countersunk hole 1511 can also be left unprocessed, and technicians in this field can select corresponding processing according to actual needs.

[0111] Continuing to use the limiting structure 1415 as an example of the limiting through hole to illustrate the assembly relationship between the extension portion and the limiting through hole, in some possible embodiments, see Figure 7 The edge of the extension portion 1422 away from the collecting portion 1421 abuts against the hole wall of the limiting through hole.

[0112] Since the extension portion 1422 is away from the edge of the collecting portion 1421 and abuts against the wall of the limiting through hole, the extension portion 1422 completely covers the opening at one end of the limiting through hole, thereby ensuring the area of ​​the extension portion 1422 in the limiting through hole, and further ensuring the welding area between the first pole 151 and the extension portion 1422, thereby improving the performance of the battery 100.

[0113] The above description is about the arrangement of the first pole 151 , and the battery 100 further includes a second pole 152 , which will be described below by way of example.

[0114] The second pole 152 is provided in a variety of structures. In a possible embodiment, referring to Figure 5 and Figure 8 The second pole 152 is integrally formed with the second current collector 143 , or the second pole 152 is laser welded, friction welded, resistance welded, or penetration welded to the second current collector 143 .

[0115] The second pole 152 is integrally formed with the second current collector 143 . It should be understood that the second pole 152 is formed by protruding from the surface of the second current collector 143 toward the top cover 130 , or the second pole 152 is integrally formed and injection-molded on the surface of the second current collector 143 toward the top cover 130 .

[0116] Since the second pole 152 and the second current collector 143 are integrally formed, the number of assembly components of the battery 100 is reduced, the assembly process of the battery 100 is simplified, and the assembly efficiency of the battery 100 is improved.

[0117] In another possible structure, see Fig. 9 A second countersunk hole 1521 is opened on the end surface of the second pole 152 away from the battery cell 120, and the end surface of the second pole 152 facing the battery cell 120 is fixed to the second current collector 143 by penetration welding.

[0118] In this embodiment, the second pole 152 and the second current collector 143 are fixed by penetration welding, which can ensure the connection stability between the second pole 152 and the second current collector 143. In addition, when the battery 100 is recycled, if the second pole 152 or the second current collector 143 fails or is damaged, only the undamaged second pole 152 or the second current collector 143 needs to be recycled, thereby improving the recycling effect of the battery 100.

[0119] In some possible embodiments, in combination with Figure 8 and Fig.10 , the surface of the first current collector 142 facing the battery cell 120 and the surface of the second current collector 143 facing the battery cell 120 are flush.

[0120] Since the surface of the first current collector 142 facing the battery cell 120 needs to be laser welded and fixed to the first pole 151, and the surface of the second current collector 143 facing the battery cell 120 needs to be laser welded and fixed to the second pole 152, when the surface of the first current collector 142 facing the battery cell 120 and the surface of the second current collector 143 facing the battery cell 120 are flush, the welding effect of the first current collector 142 and the second current collector 143 can be improved.

[0121] See also Fig.11 The embodiment of the present application further provides a battery module 200, and the battery module 200 includes the battery 100 in the above embodiment.

[0122] Among them, the battery 100 in the embodiment of the present application can have the same structure as any of the batteries 100 in the above embodiments, and can bring the same or similar beneficial effects. For details, please refer to the description in the above embodiments, and the embodiment of the present application will not be repeated here.

[0123] In addition, optionally, the battery module 200 includes a protective shell and a plurality of batteries 100 disposed in the protective shell, and the plurality of batteries 100 are connected in parallel or in series.

[0124] In addition, since the battery module 200 in this embodiment includes the battery 100 in the above embodiment, the safety of the battery module 200 is improved.

[0125] See also Fig.12 The embodiment of the present application further provides an energy storage system 300, which includes the battery module 200 in the above embodiment.

[0126] Specifically, the energy storage system 300 includes an electric energy conversion device 310, an electric load 320 and the battery module 200 in the above embodiment. The electric energy conversion device 310 is used to convert other forms of energy into electric energy. The battery module 200 can store at least part of the electric energy converted by the electric energy conversion device 310. The battery module 200 is also used to provide electric energy to the electric load 320. For example, the electric load 320 is household appliances and street lights. When the power grid is disconnected or there is a power outage, the battery module 200 supplies power to the household appliances and street lights.

[0127] In addition, the electric energy conversion device 310 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electric energy.

[0128] In this embodiment, the battery module 200 in the energy storage system 300 is the battery module 200 in the above embodiment. Therefore, the battery module 200 in this embodiment has the technical effect of the battery module 200 in the above embodiment. Since the above embodiment has fully explained the technical effect of the battery module 200, it will not be repeated here.

[0129] In addition, since the energy storage system includes the battery module in the above embodiment, the stability of the operation of the energy storage system is improved.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery, comprising a shell, a battery cell, a top cover, and a current collecting plate, characterized in that: The battery cell is installed in the shell, and the battery cell has a first pole lug area and a second pole lug area, the first pole lug area and the second pole lug area are located on the same end surface of the battery cell, and there is a gap between the first pole lug area and the second pole lug area; The current collecting plate comprises an insulator, a first current collector and a second current collector, the first current collector and the second current collector are separated and connected together through the insulator to form a current collecting plate assembly, the current collecting plate assembly is located between the battery cell and the top cover, and the first current collector and the second current collector are insulated; The first current collector is arranged above the first pole lug area, the second current collector is arranged above the second pole lug area, the first current collector is electrically connected to the first pole lug area, the second current collector is electrically connected to the second pole lug area, the first current collector is also electrically connected to the first pole, the second current collector is also electrically connected to the second pole, and the top cover covers the opening of the shell.

2. The battery according to claim 1, characterized in that The insulator is injection molded or assembled with the first current collector and the second current collector to form an integrated current collecting plate assembly.

3. The battery according to claim 1, characterized in that The first current collector and the first pole lug region, as well as the second current collector and the second pole lug region, are fixed by laser welding, ultrasonic welding or resistance welding.

4. The battery according to claim 1, characterized in that The first pole is located at the geometric center of the top cover, and the first pole is laser welded, friction welded or riveted to the first current collector.

5. The battery according to claim 1, characterized in that The insulator is provided with a first vent hole; The first current collector and the second current collector are both provided with a plurality of second vent holes; A plurality of grooves are arranged on a surface of the insulator facing the top cover to form a ventilation channel between the insulator and the top cover.

6. The battery according to claim 5, characterized in that The insulator is provided with a first mounting hole and a second mounting hole, the first current collector is mounted in the first mounting hole, and the second current collector is mounted in the second mounting hole; The first mounting hole and the second mounting hole are respectively located on two opposite sides of the geometric center of the insulator, and the plurality of first ventilation holes are located between the first mounting hole and the second mounting hole.

7. The battery according to claim 6, characterized in that A limited position structure is arranged at the geometric center of the insulator; The first current collector comprises a current collecting portion and an extending portion connected to each other, the current collecting portion is installed in the first mounting hole and connected to the first pole lug region of the battery cell, and the extending portion extends toward the limiting structure and is at least partially located in the limiting structure; The first pole extends into the limiting structure toward the end of the battery core and is connected to the extension portion.

8. The battery according to claim 7, characterized in that A first countersunk hole is formed on the end surface of the first pole facing away from the battery cell, and the end of the first pole facing the battery cell is fixed to the extension portion by penetration welding.

9. The battery according to any one of claims 1 to 8, characterized in that: The second pole and the second current collector are integrally formed; or, The second pole is laser welded, friction welded, resistance welded or penetration welded to the second current collector.

10. The battery according to any one of claims 1 to 8, characterized in that A surface of the first current collector facing the battery core is flush with a surface of the second current collector facing the battery core.

11. A battery module, characterized in that: A battery comprising the battery according to any one of claims 1 to 10.

12. An energy storage system, characterized in that: Comprising the battery module as claimed in claim 11.

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