Battery end cover and battery

Abstract

The utility model relates to the field of battery structures, in particular to a battery end cover and a battery. The battery end cover is mounted at an opening in one side of the battery shell and comprises a first cover plate; a tab connecting part is arranged on the inner side of the first cover plate, the tab connecting part is connected with a first tab at the end part of a battery cell so as to enable the first cover plate to be electrified, and the electrified polarity of the first cover plate is the same as that of the first tab. According to the battery end cover provided by the invention, a collector plate and a pole structure in the prior art are omitted, the occupation of the space of a battery shell is reduced, and the space utilization rate is improved; and the number of parts of the device is small, the manufacturing process is simple, and the production and manufacturing cost of the battery is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery structure, and in particular to a battery end cover and a battery. Background Art

[0002] In the prior art, the current collector of a cylindrical battery is generally led out of the end cap through the pole, which occupies a large space, and the current collector is usually assembled into the shell in a folded manner, which reduces the space utilization rate of the shell. The existing cylindrical battery has a large number of end parts, a complex manufacturing process, and a high cost. Utility Model Content

[0003] The purpose of the present application is to provide a battery end cover and a battery, which are used to electrically connect to a pole ear on one side of the battery, which can reduce the space occupied by the battery casing and the number of battery end components, improve space utilization, and reduce the production cost of the battery.

[0004] The present application provides a battery end cover, which is installed on a side opening of a battery housing, and the battery end cover includes a first cover plate;

[0005] A tab connection portion is provided on the inner side of the first cover plate, and the tab connection portion is connected to the first tab at the end of the battery cell to charge the first cover plate, and the polarity of the charge of the first cover plate is the same as the polarity of the charge of the first tab.

[0006] In the above technical solution, further, the tab connection portion includes a plurality of connection protrusions, and the plurality of connection protrusions are radially distributed on the inner side of the first cover plate;

[0007] The connecting protrusion is in a long strip shape, and the length direction of the connecting protrusion is the radius direction of the first cover plate.

[0008] In the above technical solution, further, the connecting protrusion is formed by applying pressure from the outer side of the first cover plate, and the thickness of the connecting protrusion is smaller than the main body thickness of the first cover plate.

[0009] In the above technical solution, further, the first cover plate is formed with a groove corresponding to the outer side of the pressure application area, and the thickness of the groove bottom area is between 0.1 mm and 1 mm.

[0010] In the above technical solution, further, a pressure relief hole is opened in the middle of the first cover plate, and the plurality of connecting protrusions are located in the circumference of the pressure relief hole;

[0011] An explosion-proof valve is installed at the inner end of the pressure relief hole, and an explosion-proof valve protection sheet is installed at the outer end of the pressure relief hole.

[0012] In the above technical solution, further, an annular reinforcement protrusion is provided on the inner side of the first cover plate, and a plurality of connecting protrusions are arranged around the circumference of the annular reinforcement protrusion; the protruding height of the annular reinforcement protrusion is less than or equal to the protruding height of the connecting protrusion;

[0013] The annular reinforcement protrusion is arranged around the circumference of the pressure relief hole, and a first sinking platform is formed between the annular reinforcement protrusion and the edge of the pressure relief hole, and the first sinking platform is used to install the explosion-proof valve.

[0014] In the above technical solution, further, a second sink is provided at the outer hole edge of the pressure relief hole, and the second sink is used to fix the explosion-proof valve protection plate.

[0015] In the above technical solution, further, the inner circumferential edge of the first cover plate is provided with a circle of step surface, and the inner side surface of the first cover plate is chamfered to transition with the step surface.

[0016] The present application also provides a battery, comprising the battery end cover described in the above solution.

[0017] In the above technical solution, further, it also includes an end cap assembly, a battery housing and a battery cell;

[0018] The battery end cover is connected to an opening at one end of the battery casing; the end cover assembly includes a second cover plate, a current collecting plate and a pole mounted on the second cover plate; the second cover plate is connected to an opening at the other end of the battery casing; the current collecting plate is connected to a second pole ear of the battery cell, and the current collecting plate is connected to the pole; the current collecting plate, the pole and the second cover plate are insulated and connected.

[0019] Compared with the prior art, the beneficial effects of this application are:

[0020] The battery end cover provided in the present application omits the current collecting plate and the pole structure in the prior art, reduces the space occupied by the battery casing, and improves the space utilization rate; and the number of parts of the device is small, the manufacturing process is simple, and the production cost of the battery is reduced.

[0021] The present application also provides a battery, including the battery end cover described in the above solution. Based on the above analysis, it can be seen that the battery also has the above beneficial effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 A first structural schematic diagram of a battery end cover provided in this application;

[0024] Figure 2 A second structural schematic diagram of a battery end cover provided in this application;

[0025] Figure 3 A third structural schematic diagram of a battery end cover provided in this application;

[0026] Figure 4 A schematic diagram of the structure of the battery provided in this application.

[0027] In the figure: 101-first cover plate; 102-ear connection portion; 103-first ear; 104-battery housing; 105-battery cell; 106-second cover plate; 107-collector plate; 108-pole column; 109-connecting protrusion; 110-groove; 111-pressure relief hole; 112-explosion-proof valve; 113-explosion-proof valve protection sheet; 114-annular reinforcement protrusion; 115-first sinking platform; 116-second sinking platform; 117-step surface; 118-insertion portion; 119-lap edge; 120-second ear. DETAILED DESCRIPTION

[0028] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] Embodiment 1

[0032] See also Figures 1 to 4 As shown, the battery end cover provided in the present application is installed on a side opening of the battery housing 104, and the battery end cover includes a first cover plate 101, and a pole ear connecting portion 102 is provided on the inner side of the first cover plate 101, and the pole ear connecting portion 102 is connected to the first pole ear 103 at the end of the battery cell 105 to charge the first cover plate 101, and the polarity of the charge of the first cover plate 101 is the same as the polarity of the charge of the first pole ear 103.

[0033] Specifically, for Figure 4 For the cylindrical battery shown in FIG. 1 , both ends of the battery housing 104 are provided with openings, but the battery end cover is only provided at one of the openings. Figure 4 As shown, the first cover plate 101 is connected to the opening on the left side of the battery housing 104 by laser welding. A battery cell 105 is installed in the battery housing 104, and a first pole lug 103 with a first polarity electricity is led out from the left side of the battery cell 105. The pole lug connecting portion 102 of the first cover plate 101 is connected to the first pole lug 103 with a first polarity electricity, so that the first cover plate 101 also carries the first polarity electricity. The first cover plate 101 is connected to the battery housing 104, and the battery housing 104 also carries the first polarity electricity.

[0034] Figure 4 The end cap assembly disclosed in the prior art is installed at the right opening of the battery housing 104, and the end cap assembly includes a second cover plate 106, a current collecting plate 107 and a pole 108, and the current collecting plate 107 and the pole 108 are installed on the second cover plate 106. The second cover plate 106 is installed at the opening on the right side of the battery housing 104 so that the second cover plate 106 also carries the first polarity electricity. The second pole lug 120 carrying the second polarity electricity is led out from the right side of the battery cell 105, and the current collecting plate 107 is connected to the second pole lug 120 carrying the second polarity electricity, and the current collecting plate 107 leads the second polarity electricity through the pole 108. Since the current collecting plate 107 and the pole 108 are insulated from the second cover plate 106, it can be ensured that the battery is not short-circuited.

[0035] The battery end cover provided in the present application omits the current collecting plate 107 and the pole 108 structure in the prior art, reduces the space occupied by the battery housing 104, and improves the space utilization rate; and the number of parts of the device is small, the manufacturing process is simple, and the production cost of the battery is reduced.

[0036] In an optional solution of this embodiment, the tab connection portion 102 includes a plurality of connection protrusions 109 , and the plurality of connection protrusions 109 are radially distributed on the inner side of the first cover plate 101 . Figure 1 5 connecting protrusions 109 are shown in the figure. The connecting protrusions 109 of the present application are not limited to the number shown in the figure, and can be set to 2, 3, etc. according to actual conditions. Each connecting protrusion 109 is in a long strip shape, and the length direction of the connecting protrusion 109 is the radius direction of the first cover plate 101. Specifically, the height a of the connecting protrusion 109 is 0.1 mm to 1 mm higher than the inner surface of the first cover plate 101.

[0037] In this embodiment, the pole ear connecting portion 102 is a connecting protrusion 109 formed on the inner side of the first cover plate 101. When the first cover plate 101 is buckled at the opening of the battery housing 104, the protruding structure of the connecting protrusion 109 can apply a clamping force to the first pole ear 103, so that the first pole ear 103 and the connecting protrusion 109 are firmly welded, thereby avoiding the first pole ear 103 with a softer texture from not fitting tightly with the first cover plate 101 and affecting the welding quality.

[0038] Furthermore, the first pole tab 103 led out of the battery cell 105 can be welded with the connecting protrusion 109 after being bent, and the bending direction of the first pole tab 103 is the radial direction of the circular first cover plate 101, and the length direction of the connecting protrusion 109 is also the radial direction of the first cover plate 101, which can make the contact area between the first pole tab 103 and the connecting protrusion 109 larger. The radial distribution of multiple connecting protrusions 109 can make the first pole tabs 103 at each position be welded with the corresponding connecting protrusion 109 after being bent. And the design of equidistant arrangement of the connecting protrusions 109 can prevent the problem of failure caused by uneven force distribution after welding of the first cover plate 101, and improve the strength of the first cover plate 101.

[0039] In the optional solution of this embodiment, Figure 2 and Figure 3As shown, the connection protrusion 109 is formed by pressing the outer side of the first cover plate 101, and the first cover plate 101 has a groove 110 formed on the outer side of the pressure area, and the thickness of the connection protrusion 109 is less than the main body thickness of the first cover plate 101. Specifically, a plurality of connection protrusions 109 are formed by stamping from the outer side of the first cover plate 101, and the stamping causes the material to stretch, so that the thickness at the position of the connection protrusion 109 becomes thinner. When the connection protrusion 109 is connected to the first pole ear 103 by laser penetration welding, the thickness of the penetration welding can be reduced, which further reduces the welding difficulty and improves the welding stability.

[0040] Specifically, the bottom area of ​​the groove 110 is a planar structure, and the position of the connecting protrusion 109 corresponding to the bottom of the groove is also a planar structure, so that a flat welding area is formed here and can be attached to the first pole tab 103. The thickness b of the bottom area of ​​the groove 110 is between 0.1 mm and 1 mm, which can effectively reduce the thickness of the penetration welding, thereby reducing the welding difficulty and improving the welding stability.

[0041] In an optional solution of this embodiment, a circular pressure relief hole 111 is opened in the middle of the first cover plate 101, and a plurality of connecting protrusions 109 are located around the pressure relief hole 111; a circular explosion-proof valve 112 is welded and installed on the inner side of the pressure relief hole 111, and a circular explosion-proof valve protection sheet 113 is bonded and installed on the outer side of the pressure relief hole 111. When the battery has thermal runaway, a large amount of smoke generated inside can be discharged through the explosion-proof valve 112.

[0042] In an optional scheme of this embodiment, an annular reinforcement protrusion 114 (which can be formed by accumulation of processed materials) is provided on the inner side of the first cover plate 101, and a plurality of connecting protrusions 109 are arranged around the circumference of the annular reinforcement protrusion 114; the protruding height c of the annular reinforcement protrusion 114 is less than or equal to the protruding height of the connecting protrusion 109; the annular reinforcement protrusion 114 is arranged around the circumference of the pressure relief hole 111, and a first sinker 115 is formed between the annular reinforcement protrusion 114 and the edge of the pressure relief hole 111, and the first sinker 115 is used to install the explosion-proof valve 112.

[0043] In this embodiment, the first cover plate 101 is heightened around the inner side of the pressure relief hole 111 (i.e., the annular reinforcement protrusion 114), that is, a first low-positioned sink 115 is formed at the inner hole edge of the pressure relief hole 111, and the explosion-proof valve 112 is installed on the first sink 115 so that the explosion-proof valve 112 can be embedded in the first cover plate 101, thereby forming a flat installation structure. If the first sink 115 is opened around the pressure relief hole 111 with low strength of the first cover plate 101, the thickness of this position will be reduced, which will affect the strength of the first cover plate 101.

[0044] In an optional solution of this embodiment, a second recessed platform 116 is provided at the outer edge of the pressure relief hole 111, and the second recessed platform 116 is used to fix the explosion-proof valve protection sheet 113 so that the explosion-proof valve protection sheet 113 can be embedded in the first cover plate 101, thereby forming a flat installation structure.

[0045] Embodiment 2

[0046] The battery end cover in the second embodiment is an improvement on the above embodiment, and the technical contents disclosed in the above embodiment will not be described repeatedly, and the contents disclosed in the above embodiment also belong to the contents disclosed in the second embodiment.

[0047] In an optional solution of this embodiment, a circle of stepped surface 117 is provided on the inner circumferential edge of the first cover plate 101, thereby forming an inserting portion 118 and an overlapping edge 119, the inserting portion 118 is embedded in the battery housing 104, and the overlapping edge 119 overlaps the shell wall of the battery housing 104. The inner side surface of the first cover plate 101 and the stepped surface 117 are chamfered to make it easier to assemble the inserting portion 118 into the battery housing 104.

[0048] Embodiment 3

[0049] Embodiment 3 of the present application provides a battery, including a battery end cover of any of the above embodiments, and thus has all the beneficial technical effects of the battery end cover of any of the above embodiments, which will not be elaborated here.

[0050] In an optional solution of this embodiment, the battery further includes an end cap assembly, a battery housing 104 and a battery cell 105. The battery end cap is connected to an opening at one end of the battery housing 104 by laser welding. The end cap assembly includes a second cover plate 106, a current collecting plate 107 mounted on the second cover plate 106, and a pole 108. The second cover plate 106 is connected to the other end opening of the battery housing 104 by laser welding, and a sealing aluminum nail is welded to the injection hole mounting sink opened in the second cover plate 106 to seal the injection hole. The battery end cap, the battery housing 104 and the second cover plate 106 are charged with a first polarity.

[0051] The collecting plate 107 is folded and welded to the second pole lug 120 of the cylindrical winding core, and the collecting plate 107 is connected to the pole 108, so that the pole 108 carries the second polarity electricity, so that the second polarity electricity can be led out. Since the collecting plate 107, the pole 108 and the second cover plate 106 are insulated and connected, the battery can be protected from short circuit.

[0052] The implementation steps of the battery are as follows:

[0053] 1. Welding of the battery end cover and the battery housing 104: The step surface 117 of the first cover plate 101 abuts against the open end surface of the battery housing 104, and laser welding is performed along the outer side to connect the battery housing 104 and the first cover plate 101.

[0054] 2. Preparation of winding core: The winding core is prepared according to the processes of film making and winding. The first pole tabs 103 and the second pole tabs 120 on both sides of the winding core can be flattened with multiple pole tabs or flattened with all pole tabs.

[0055] 3. Welding the second electrode tab 120 with the second polarity electricity: The second electrode tab 120 with the second polarity electricity is placed upward, and the current collecting plate 107 is welded to the second electrode tab 120 with the second polarity electricity.

[0056] 4. Welding the first pole ear 103 with the first polarity charge: The first pole ear 103 with the first polarity charge at the other end of the winding core is placed into the battery housing 104 toward the first cover plate 101, and the first pole ear 103 with the first polarity charge is placed upward, and the first pole ear 103 and the first cover plate 101 are welded by laser penetration along the groove 110 of the first cover plate 101.

[0057] 5. Inserting into the shell: fold the current collecting plate 107, and the stepped surface around the second cover plate 106 abuts against the opening of the battery shell 104, and the outer edge is laser welded to connect the battery shell 104 and the second cover plate 106;

[0058] 6. Liquid injection, formation, and sealing: Inject electrolyte into the battery housing 104 from the liquid injection hole of the second cover plate 106. After the formation is completed, seal the battery by welding sealing pins to the mounting sink outside the through hole to complete the battery preparation.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In addition, a person skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means being within the scope of the present application and forming different embodiments.

Claims

1. A battery end cover, mounted on a side opening of a battery housing, characterized in that: The battery end cover comprises a first cover plate; A tab connection portion is provided on the inner side of the first cover plate, and the tab connection portion is connected to the first tab at the end of the battery cell to charge the first cover plate, and the polarity of the charge of the first cover plate is the same as the polarity of the charge of the first tab.

2. The battery end cover according to claim 1, characterized in that: The tab connection portion includes a plurality of connection protrusions, and the plurality of connection protrusions are radially distributed on the inner side of the first cover plate; The connecting protrusion is in a long strip shape, and the length direction of the connecting protrusion is the radius direction of the first cover plate.

3. The battery end cover according to claim 2, characterized in that: The connecting protrusion is formed by applying pressure from the outer side of the first cover plate, and the thickness of the connecting protrusion is smaller than the main body thickness of the first cover plate.

4. The battery end cover according to claim 3, characterized in that: The first cover plate is formed with a groove corresponding to the outer side of the pressure application area, and the thickness of the groove bottom area is between 0.1 mm and 1 mm.

5. The battery end cover according to claim 2, characterized in that: A pressure relief hole is opened in the middle of the first cover plate, and a plurality of connecting protrusions are located in the circumference of the pressure relief hole; An explosion-proof valve is installed at the inner end of the pressure relief hole, and an explosion-proof valve protection sheet is installed at the outer end of the pressure relief hole.

6. The battery end cover according to claim 5, characterized in that: An annular reinforcement protrusion is provided on the inner side of the first cover plate, and a plurality of connecting protrusions are arranged around the circumference of the annular reinforcement protrusion; the protruding height of the annular reinforcement protrusion is less than or equal to the protruding height of the connecting protrusion; The annular reinforcement protrusion is arranged around the circumference of the pressure relief hole, and a first sinking platform is formed between the annular reinforcement protrusion and the edge of the pressure relief hole, and the first sinking platform is used to install the explosion-proof valve.

7. The battery end cover according to claim 5, characterized in that: A second sinking platform is arranged at the outer hole edge of the pressure relief hole, and the second sinking platform is used for fixing the explosion-proof valve protection sheet.

8. The battery end cover according to claim 1, characterized in that: The inner circumferential edge of the first cover plate is provided with a circle of step surface, and the inner side surface of the first cover plate is chamfered to transition with the step surface.

9. A battery, characterized in that: A battery end cover comprising the battery end cover as claimed in any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that Also includes an end cap assembly, a battery casing and a battery cell; The battery end cover is connected to an opening at one end of the battery casing; the end cover assembly includes a second cover plate, a current collecting plate and a pole mounted on the second cover plate; the second cover plate is connected to an opening at the other end of the battery casing; the current collecting plate is connected to a second pole ear of the battery cell, and the current collecting plate is connected to the pole; the current collecting plate, the pole and the second cover plate are insulated and connected.

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