Top cover of battery and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a top cover of a battery and the battery, and the top cover comprises a cover plate main body, an insulating part and a pole assembly, at least one through hole is formed in the cover plate main body, the insulating part is arranged at the through hole, the insulating part has elasticity and is of an annular structure, and the outer ring of the insulating part is hermetically connected with the cover plate main body in a mutual insertion manner; the inner ring of the insulating part is hermetically connected with the outer side wall of the pole component in a mutual insertion manner; the pole assembly is provided with a lead-out hole for a battery cell tab to penetrate through, and the pole assembly is used for being welded with the tab penetrating out of the lead-out hole; the battery mainly solves the technical problem that the energy density of the battery is relatively low due to the fact that a top cover in the prior art occupies relatively much space in the battery and a gap for bending a tab exists between the top surface of a battery cell and the top cover.

Description

Technical Field

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

[0002] At present, the outer shell of a lithium-ion battery includes a housing and a top cover. Among them, the battery cells are accommodated in the housing, and the top cover is used to seal the opening on the housing. The top cover is also used to lead out the positive or negative electrode of the battery cells. Specifically, the existing top cover usually includes a pole post boss, a lower plastic, a transfer block and many other components that occupy a relatively large height space, resulting in waste of the internal space of the outer shell, so that the power of the battery under a certain volume is limited. In addition, the tabs led out from the current battery cells are all welded to the bottom of the top cover. When the tabs are welded and the top cover seals the opening of the housing, the tabs will be bent and occupy a part of the internal space of the outer shell. That is, there will be a gap for the tabs to bend between the top surface of the current battery cells and the bottom surface of the top cover. This gap also leads to waste of the internal space of the battery, thus also resulting in the power of the battery under a certain volume being limited and the energy density of the battery not being able to be further improved.

[0003] Therefore, it is necessary to improve the existing technology. Summary of the Utility Model

[0004] The utility model provides a top cover of a battery and a battery, mainly solving the technical problem that the top cover of the existing technology occupies more space inside the battery and there is a gap for the tabs to bend between the top surface of the battery cells and the top cover, resulting in a lower energy density of the battery.

[0005] To achieve the above object, the utility model provides the following technical solutions:

[0006] A top cover of a battery, comprising a cover plate main body, an insulating member and a pole post assembly;

[0007] At least one through hole is provided on the cover plate main body, and the insulating member is provided at the through hole. The insulating member has elasticity and is in a ring structure. The outer ring of the insulating member is sealingly connected to the cover plate main body in an inserted manner, and the inner ring of the insulating member is sealingly connected to the outer side wall of the pole post assembly in an inserted manner;

[0008] The pole post assembly is provided with an extraction hole for the battery cell tab to pass through, and the pole post assembly is used to be welded to the tab passing through the extraction hole.

[0009] In one of the technical solutions, a first annular protrusion is convexly provided on the circumferential hole wall of the through hole, and a first annular groove is provided on the outer ring of the insulating member. The first annular protrusion is inserted into the first annular groove.

[0010] In one of the technical solutions, the inner circle of the insulating member is provided with a circle of second annular protrusions, the outer side wall of the pole assembly is provided with a circle of second annular grooves, and the second annular protrusions are inserted into the second annular grooves.

[0011] In one of the technical solutions, the pole assembly includes a pole body and a transition piece which are connected and both are conductive parts;

[0012] The outer wall of the adapter is sealed and connected to the inner ring of the insulating member by plugging into each other. The adapter is provided with a lead-out hole that penetrates therethrough. The pole body and the adapter are jointly arranged to form a protective space. The side of the adapter facing the pole body is used for welding to the pole ear of the battery cell passing through the lead-out hole. The lead-out hole is connected to the protective space, and the protective space is used to accommodate the pole ear.

[0013] In one of the technical solutions, the adapter is a sheet-like structure, a concave groove is provided on a side of the pole body facing the adapter, and the groove wall of the concave groove and the outer wall of the adapter are jointly formed to form the protection space.

[0014] In one of the technical solutions, a surface of the adapter facing away from the pole body does not exceed the bottom surface of the cover body.

[0015] In one of the technical solutions, an insulating layer is provided on the bottom surface of the cover plate body facing the battery cell.

[0016] In one of the technical solutions, two through holes are provided on the cover plate body, and an insulating member is sealed and connected to each of the two through holes. A pole assembly is sealed and connected to each of the two insulating members, and the polarities of the two pole assemblies are opposite to each other.

[0017] In one of the technical solutions, the top cover also includes an explosion-proof valve assembly, the cover plate body is provided with a through hole, and the explosion-proof valve assembly includes a protective net, an explosion-proof valve body and a protective sheet which are arranged in sequence from the inside to the outside and are all connected to the cover plate body; the protective net and the explosion-proof valve body are both arranged in the hole, and the protective net does not exceed the bottom surface of the cover plate body.

[0018] The present application also provides a battery, comprising a shell, a battery cell and the top cover described above, wherein the shell is provided with an open mounting groove, the battery cell is accommodated in the mounting groove, the cover plate body seals the notch of the mounting groove, and the pole assembly is electrically connected to the pole ear led out from the battery cell.

[0019] Compared with the prior art, the top cover of the battery provided by the utility model has at least the following beneficial effects:

[0020] With this solution, the tab led out from the battery cell can pass through the lead-out hole on the terminal assembly and be connected to the terminal assembly, so that the tab does not need to be welded to the bottom of the top cover. That is, there is no need to set a gap for the tab to bend between the top surface of the battery cell and the bottom surface of the top cover. Therefore, the battery cell can be made higher and closer to the bottom surface of the top cover, and thus the power of the battery under a certain volume can be increased, that is, the energy density of the battery can be improved.

[0021] Secondly, compared with the traditional top cover including components such as lower plastic, terminal boss, and adapter block that occupy more space, the structure of the top cover of this solution is simpler and thinner, reducing the space occupied by the top cover inside the battery. Therefore, the space utilization rate inside the battery is greatly improved, and there is more space to increase the height of the battery cell, thereby further increasing the power of the battery under a certain volume, that is, further improving the energy density of the battery.

[0022] In addition, by designing the outer ring of the insulating part and the main body of the cover plate, and the inner ring of the insulating part and the outer side wall of the terminal assembly to be sealed and connected by means of mutual insertion, the sealing performance between the terminal assembly and the main body of the cover plate is improved, the risk of external substances entering the battery from the through hole is reduced, and at the same time, the fixing reliability of the terminal assembly relative to the main body of the cover plate is also improved. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of a battery provided by an embodiment of the present application;

[0025] Figure 2 For Figure 1 The exploded view of the structure of the battery shown;

[0026] Figure 3 For Figure 1 The cross-sectional view of the battery at the terminal position shown;

[0027] Figure 4 For Figure 3 The partial enlarged view at A in;

[0028] Figure 5 It is a schematic structural diagram of the top cover provided by an embodiment of the present application;

[0029] Figure 6 For Figure 5Partial enlarged view at B in [the figure];

[0030] Figure 7 is Figure 1 Cross-sectional view of the battery shown at the position of the explosion-proof valve assembly;

[0031] Figure 8 is Figure 7 Partial enlarged view at C in [the figure].

[0032] Reference numerals:

[0033] 10. Top cover; 20. Housing; 201. Mounting groove; 30. Battery cell; 301. Tab;

[0034] 1. Cover body; 11. Through hole; 12. First annular protrusion; 13. Hole position;

[0035] 2. Insulating member; 21. First annular groove; 22. Second annular protrusion;

[0036] 3. Terminal assembly; 31. Terminal body; 311. Concave groove; 32. Adapter; 321. Lead-out hole; 322. Second annular groove; 33. Protection space;

[0037] 4. Explosion-proof valve assembly; 41. Protection net; 42. Explosion-proof valve body; 43. Protection piece; 5. Insulating layer. Detailed implementation manners

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0040] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 should not be construed as a limitation to the present application.

[0041] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0042] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0043] Please refer to Figures 1 to 4 , an embodiment of the present utility model provides a battery, including a top cover 10, a housing 20 and an electric core 30. Among them, an open installation groove 201 is provided in the housing 20, and the electric core 30 is transferred into the installation groove 201. One or more electric cores 30 can be accommodated in the installation groove 201. Among them, the top cover 10 includes a connected cover plate main body 1 and a pole column assembly 3. The cover plate main body 1 and the housing 20 are welded and sealed at the notch of the installation groove 201 to prevent external substances from entering the installation groove 201. The pole tabs 301 led out from the electric core 30 and the pole column assembly 3 are electrically connected by welding. In other words, the pole column assembly 3 functions to lead out the electrode serving as the positive or negative pole on the electric core 30 outward, so as to realize the function that the internal electric core 30 can discharge externally or the external power supply can charge the internal electric core 30.

[0044] Please refer to Figures 1 to 6 , the top cover 10 further includes an insulating member 2. Among them, at least one through hole 11 is provided on the cover plate main body 1, and the above-mentioned insulating member 2 is provided at the through hole 11. The insulating member 2 has elasticity, and the insulating member 2 is in a ring structure. The insulating member 2 is arranged between the cover plate main body 1 and the pole column assembly 3. The insulating member 2 is used to separate the cover plate main body 1 and the pole column assembly 3 and seal the through hole 11, so that the cover plate main body 1 is not charged or has the opposite polarity to that of the pole column assembly 3. For specific understanding, please refer to the following two paragraphs:

[0045] Two through holes 11 can be provided on the cover plate main body 1, and an insulating member 2 is sealed at each through hole 11. A pole column assembly 3 is hermetically connected to each of the two insulating members 2, so that there are two pole column assemblies 3 on the top cover 10, and the polarities of the two pole column assemblies 3 are opposite. That is, one of the pole column assemblies 3 leads out the positive pole of the internal electric core 30, and the other pole column assembly 3 leads out the negative pole of the internal electric core 30. The housing 20 of the battery with such a structure is usually designed to be not charged.

[0046] Only one through hole 11 can also be provided on the cover plate main body 1, and the housing 20 is set to be charged, and the polarity of the housing 20 is opposite to that of the pole column assembly 3 located at the through hole 11.

[0047] Please refer to again together Figures 1 to 6 , a lead-out hole 321 is provided on the pole column assembly 3, and the tab 301 of at least one battery cell 30 passes through the lead-out hole 321 and is welded to the pole column assembly 3 to achieve electrical connection between the pole column assembly 3 and the tab 301 of the battery cell 30. When there are multiple battery cells 30 inside the battery, the tabs 301 of the same polarity of the multiple battery cells 30 can all pass through the same lead-out hole 321 and be welded to the same pole column assembly 3. By providing the lead-out hole 321 on the pole column assembly 3, the tab 301 does not need to be welded to the bottom of the top cover 10, that is, there is no need to provide a gap for the tab 301 to bend between the top surface of the battery cell 30 and the bottom surface of the top cover 10, so that the battery cell 30 can be made higher and closer to the bottom surface of the top cover 10, and thus the power of the battery under a certain volume can be increased, that is, the energy density of the battery can be increased. Compared with the traditional top cover including components such as lower plastic, pole column boss, and adapter block that occupy more space, the structure of the above-mentioned top cover 10 is simpler and thinner at the same time, reducing the space occupied by the top cover 10 inside the battery, thereby greatly improving the space utilization rate inside the battery, and there can be more space for increasing the height of the battery cell 30, thereby further increasing the power of the battery under a certain volume, that is, further increasing the energy density of the battery.

[0048] Please refer to together Figures 3 to 6 , the outer ring of the insulating part 2 is hermetically connected to the cover body 1 in an interlocking manner, and the inner ring of the insulating part 2 is hermetically connected to the outer side wall of the pole column assembly 3 in an interlocking manner. Specifically, a first annular protrusion 12 protrudes from the circumferential hole wall of the through hole 11, and a first annular groove 21 is provided on the outer ring of the insulating part 2. The first annular protrusion 12 is inserted into the first annular groove 21 to achieve sealing between the insulating part 2 and the cover body 1; a second annular protrusion 22 protrudes from the inner ring of the insulating part 2, and a second annular groove 322 is provided on the outer side wall of the pole column assembly 3. The second annular protrusion 22 is inserted into the second annular groove 322 to achieve sealing between the insulating part 2 and the pole column assembly 3. Through such design, the reliability of the insulating part 2 in sealing between the pole column assembly 3 and the cover body 1 can be improved, the risk of external substances entering the battery through the through hole 11 can be reduced, and at the same time, the firmness of the pole column assembly 3 fixed relative to the cover body 1 can also be improved. In addition, through the design of the insulating part 2, while the insulating part 2 can seal the pole column assembly 3 and the cover body 1, the thickness of the insulating part 2 is relatively thin, and the relatively thin insulating part 2 does not occupy the space inside the battery, which is beneficial to improving the power and energy density of the battery.

[0049] Please refer to together Figures 3 to 6The pole assembly 3 specifically includes a pole body 31 and an adapter 32, both of which are metal conductive parts, wherein the above-mentioned second annular groove 322 is arranged on the outer wall of the adapter 32, that is, the outer wall side of the adapter 32 and the inner ring of the insulating part 2 are sealed and connected in a plug-in manner, and the above-mentioned lead-out hole 321 is arranged in the middle of the adapter 32, and the lead-out hole 321 runs through the entire adapter 32, and the pole body 31 is welded on the top surface of the adapter 32 facing away from the battery cell 30, and the pole body 31 and the adapter 32 are jointly enclosed to form a protective space 33, and this protective space 33 and the lead-out hole 321 are interconnected, and the pole ear 301 on the battery cell 30 is located in the protective space 33 after passing through the lead-out hole 321. In fact, the pole ear 301 on the battery cell 30 is welded on the side of the adapter 32 facing the pole body 31 (that is, the top surface of the adapter 32). It can be seen that by designing the pole assembly 3 as a pole body 31 and an adapter 32 that are connected separately, a protective space 33 for protecting the pole lug 301 can be formed, thereby solving the problem that the pole lug 301 is easily damaged by external forces.

[0050] Optionally, see Figure 4 The adapter 32 is a flat sheet structure, and a concave groove 311 is provided on one side of the pole body 31 facing the adapter 32. The groove wall of the concave groove 311 and the outer wall surface of the adapter 32 are jointly formed to form the above-mentioned protection space 33. Through such a design, while realizing the formation of the protection space 33, it is also helpful to weld the pole ear 301 of the battery cell 30 firmly to the top surface of the adapter 32. After the pole ear 301 is welded to the adapter 32, the pole body 31 is covered on the top surface of the adapter 32 and welded to the adapter 32 to prevent the pole ear 301 from being exposed to the outside.

[0051] Optionally, refer again to Figure 4 The side of the adapter 32 facing away from the pole body 31 and the side of the insulating member 2 facing away from the pole body 31 do not exceed the bottom surface of the cover body 1, so that the top cover 10 does not occupy the space in the installation groove 201, which is conducive to freeing up more space for the battery cell 30, thereby improving the battery power and energy density.

[0052] Preferably, in order to increase the power, the top surface of the battery cell 30 of this solution is equivalent to being very close to the bottom surface of the top cover 10 or even directly against the bottom surface of the top cover 10. In order to solve the problem that the bottom surface of the cover body 1 is directly in contact with the battery cell 30, causing the cover body 1 to be charged and easily cause a short circuit, an insulating layer 5 can be provided on the bottom surface of the cover body 1 facing the battery cell 30. The thickness of the insulating layer 5 is preferably 0.001mm-0.5mm. The insulating layer 5 can be realized by applying insulating paint on the bottom surface of the cover body 1, or the insulating layer 5 can also be an insulating component located between the cover body 1 and the battery cell 30.

[0053] Please also readFigure 1 , Figure 2 , Figure 7 and Figure 8 The top cover 10 also includes an explosion-proof valve assembly 4. A through hole 13 is set on the cover body 1. The explosion-proof valve assembly 4 is set at the hole 13 and is used to allow the battery to exhaust gas from the hole 13 in time when thermal runaway occurs, thereby reducing the risk of battery explosion. The explosion-proof valve assembly 4 specifically includes a protective net 41, an explosion-proof valve body 42 and a protective sheet 43 which are arranged in sequence from the inside to the outside and are all fixedly connected to the cover plate body 1. The explosion-proof valve body 42 is arranged in the hole 13. When thermal runaway occurs inside the battery, the gas inside the battery will break through the explosion-proof valve body 42, thereby venting and relieving the gas and pressure to the outside. The mesh holes inside the protective net 41 can allow the gas inside the battery to pass through and act on the explosion-proof valve body 42, thereby realizing the basic explosion-proof function. The protective net 41 also plays a role in supporting the explosion-proof valve body 42 to prevent the explosion-proof valve body 42 from falling into the battery after breaking and easily causing a short circuit. The protective sheet 43 is used to prevent external objects from acting on the explosion-proof valve body 42 and causing the explosion-proof valve body 42 to break, that is, to prevent the explosion-proof valve body 42 from breaking when the battery has not thermal runaway, thereby ensuring that the battery has a higher safety and reducing the risk of battery leakage. Preferably, the protective net 41 of the present solution is also arranged in the hole 13, and the protective net 41 does not exceed the bottom surface of the cover body 1 facing the battery cell 30, so that the top cover 10 does not occupy the space inside the mounting groove 201, and the top surface of the battery cell 30 can be as close to the bottom surface of the top cover 10 as possible or even fit with the bottom surface of the top cover 10, thereby increasing the power of the battery under a certain volume, that is, the energy density of the battery can be increased.

[0054] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A battery top cover, characterized in that: It comprises a cover plate body (1), an insulating member (2) and a pole assembly (3); The cover plate body (1) is provided with at least one through hole (11) extending therethrough, the insulating member (2) is provided at the through hole (11), the insulating member (2) is elastic and has an annular structure, the outer ring of the insulating member (2) is sealedly connected to the cover plate body (1) in a plug-in manner, and the inner ring of the insulating member (2) is sealedly connected to the outer wall of the pole assembly (3) in a plug-in manner; The pole assembly (3) is provided with a lead-out hole (321) for the pole lug of the power core to pass through, and the pole assembly (3) is used to be connected to the pole lug passing through the lead-out hole (321); The pole assembly (3) comprises a pole body (31) and a transition piece (32) which are connected and both are conductive parts; The outer wall of the adapter (32) is sealed and connected to the inner ring of the insulating member (2) in a plug-in manner; the adapter (32) is provided with a lead-out hole (321) that penetrates therethrough; the pole body (31) and the adapter (32) are jointly arranged to form a protective space (33); a side of the adapter (32) facing the pole body (31) is used for welding with a pole ear of the battery cell that passes through the lead-out hole (321); the lead-out hole (321) is communicated with the protective space (33); and the protective space (33) is used to accommodate the pole ear.

2. The top cover of the battery as claimed in claim 1, characterized in that: A first annular protrusion (12) is convexly provided on a peripheral hole wall of the through hole (11), and a first annular groove (21) is provided on the outer ring of the insulating member (2), wherein the first annular protrusion (12) is inserted into the first annular groove (21).

3. The top cover of the battery as claimed in claim 1, characterized in that: The inner ring of the insulating member (2) is provided with a circle of second annular protrusions (22), the outer side wall of the pole assembly (3) is provided with a circle of second annular grooves (322), and the second annular protrusions (22) are inserted into the second annular grooves (322).

4. The top cover of the battery as claimed in claim 1, characterized in that: The adapter (32) is a sheet-like structure, and a concave groove (311) is provided on one side of the pole body (31) facing the adapter (32), and the groove wall of the concave groove (311) and the outer wall of the adapter (32) are jointly arranged to form the protection space (33).

5. The top cover of the battery as claimed in claim 1, characterized in that: A side of the adapter (32) facing away from the pole body (31) and a side of the insulating member (2) facing away from the pole body (31) both do not extend beyond the bottom surface of the cover plate body (1).

6. The top cover of the battery as claimed in claim 1, characterized in that: An insulating layer (5) is provided on the bottom surface of the cover plate body (1) facing the battery core.

7. The top cover of the battery as claimed in claim 1, characterized in that: The cover plate body (1) is provided with two through holes (11), each of the two through holes (11) is sealedly connected to an insulating member (2), each of the two insulating members (2) is sealedly connected to a pole assembly (3), and the polarities of the two pole assemblies (3) are opposite to each other.

8. The top cover of the battery as claimed in claim 1, characterized in that: The top cover also includes an explosion-proof valve assembly (4); a through hole (13) is provided on the cover plate body (1); the explosion-proof valve assembly (4) includes a protection net (41), an explosion-proof valve body (42) and a protection sheet (43) which are arranged in sequence from the inside to the outside and are all connected to the cover plate body (1); the protection net (41) and the explosion-proof valve body (42) are both arranged in the hole (13), and the protection net (41) does not extend beyond the bottom surface of the cover plate body (1).

9. A battery, characterized in that: It comprises a shell (20), a battery cell (30) and a top cover (10) according to any one of claims 1 to 8, wherein the shell (20) is provided with an open mounting groove (201), the battery cell (30) is accommodated in the mounting groove (201), the cover body (1) seals the notch of the mounting groove (201), and the pole assembly (3) is electrically connected to the pole ear (301) led out from the battery cell (30).

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