Lithium ion battery cover and battery thereof

Abstract

The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery cover which comprises a polished aluminum sheet, a positive pole, a negative pole, an anti-explosion valve and lower plastic cement, the positive pole and the negative pole are fixed on the polished aluminum sheet in an injection molding and riveting mode, and at least one pole module is connected with the polished aluminum sheet in an insulating mode. A liquid injection hole and an anti-explosion valve hollow hole site are formed in the light aluminum sheet, a grating corresponding to the anti-explosion valve is arranged on the lower portion of the lower plastic, a lower plastic extension plate is arranged at the bottom of the lower plastic, a plurality of flow guide holes are formed in the lower plastic extension plate and correspond to the grating, and supporting ribs are fixed to the two sides of each flow guide hole. An exhaust space is formed between the lower part of the grid and the lower plastic extension plate through the supporting ribs. According to the structure, through the design that a layer of lower plastic is added to the battery cover, a circulating gap is reserved for the first layer of explosion-proof valve opening, smooth flowing of gas is guaranteed, the opening stability of the explosion-proof valve is improved, and the explosion-proof valve can be exploded under normal opening pressure.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lithium ion battery technical field, concretely relates to a lithium ion battery cover and battery thereof. BACKGROUND

[0002] With the development of electric vehicles, people's requirements for the capacity, charging and discharging speed and safety of the battery are higher and higher; among them, the increase of capacity will inevitably lead to the increase of the volume of the battery cell, that is, the increase of the size of the battery cell, and the problem that the strength of the cover plate of the battery cell is accompanied by the increase of the size of the battery cell; especially the middle position of the cover plate, the installation of the hollow space of the explosion-proof valve is superimposed, the strength is the weakest, and the deformation is most likely to occur; when the internal pressure is too large due to the out-of-control gas generation in the working process of the battery cell, the cover plate will be deformed upward; it is very likely that the explosion-proof valve and the cover plate will be deformed due to the deformation of the explosion-proof valve and the cover plate, resulting in failure, and the risk of leakage of the battery cell explosion-proof valve not being opened.

[0003] A lithium ion power battery cover is disclosed in Chinese patent (publication number: CN210325871U), which comprises a cover plate base material provided with a liquid injection hole one, two pole column through holes one, an explosion-proof valve hole one, an insulation support, two pole columns and an explosion-proof valve; the upper end surface of the cover plate base material is provided with pole column through hole bosses around the two pole column through holes one, the upper end surface of the cover plate base material is provided with explosion-proof valve through hole bosses around the explosion-proof valve hole one, the lower end surface of the cover plate base material is provided with liquid injection through hole bosses around the liquid injection hole one, and the lower end surface of the cover plate base material is further provided with a reinforcing support device; the reinforcing support device comprises a plurality of bent reinforcing ribs, a plurality of circular reinforcing ribs and a plurality of straight reinforcing ribs; the insulation support is provided with a liquid injection hole two, two pole column through holes two and an explosion-proof valve hole two corresponding to the liquid injection hole one, the two pole column through holes one and the explosion-proof valve hole one of the cover plate base material in sequence, and the insulation support is fixed to the lower end surface of the cover plate base material. In the patent, the lower plastic layer has only one layer of design, which will block the opening position of the lower plastic layer below the explosion-proof valve (that is, the position of the insulation support grid 18 in the patent) after the pole group is put into the shell, resulting in poor gas flow, so that the explosion-proof valve may not be opened at the specified value, thereby failing to play a timely protection role. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a lithium ion battery cover and battery thereof, solving the problems in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] The utility model provides a kind of lithium ion battery cover, including light aluminum sheet, positive pole, negative pole, explosion-proof valve and lower plastic, positive pole, negative pole are fixed on light aluminum sheet by injection molding, riveting mode, and at least one pole module is insulatedly connected with light aluminum sheet, there is injection hole and explosion-proof valve openwork hole position on light aluminum sheet, explosion-proof valve is aluminum material sheet structure, by welding to explosion-proof valve openwork hole position, the lower portion of lower plastic is equipped with the grating corresponding with explosion-proof valve, it is characterized in that: the bottom of lower plastic is equipped with lower plastic extension plate, the lower plastic extension plate is equipped with a plurality of flow guide holes, the flow guide hole is corresponding with the grating, the flow guide hole is fixed with support rib on both sides, support rib makes grating lower portion and lower plastic extension plate between having exhaust space. By changing battery cover and increasing the design of a layer of lower plastic, the first layer explosion-proof valve opening is left out gap, ensure that the flow of gas is unobstructed, improve the opening stability of explosion-proof valve, so that it can be under normal opening pressure burst.

[0007] Preferably, the height of the support rib is higher than the thickness of the grating, after the lower plastic extension plate is fixed on the bottom of the lower plastic, the two support ribs are located on both sides of the grating and connected with the lower plastic.

[0008] Preferably, the distance between the two support ribs is less than the width of the grating, after the lower plastic extension plate is fixed on the bottom of the lower plastic, the two support ribs are connected with the bottom of the grating.

[0009] Preferably, one end of the lower plastic extension plate is hinged to one end of the lower plastic, and the other end of the lower plastic extension plate has a buckle.

[0010] Preferably, both ends of the lower plastic extension plate are provided with buckles, and the buckles are connected with the buckle holes at both ends of the lower plastic, respectively.

[0011] Preferably, the height of the support rib is at least 0.5mm greater than the thickness of the grating.

[0012] Preferably, the bottom of the lower plastic extension plate is provided with a flow guide structure, and the flow guide structure is located directly below the injection hole on the light aluminum sheet.

[0013] Preferably, the flow guide structure includes a U-shaped flow guide plate, a through hole and a flow guide hole, the through hole is provided on the lower plastic extension plate, both ends of the U-shaped flow guide plate are fixed on both ends of the through hole, and the flow guide hole is located on both sides of the U-shaped flow guide plate and communicates with the through hole.

[0014] Preferably, the U-shaped flow guide plate is arranged along the length direction of the lower plastic extension plate, and the flow guide hole faces the width direction of the lower plastic extension plate.

[0015] The utility model discloses still disclose a kind of batteries, including pole group main body and battery shell, pole group main body is installed in the battery shell, the upper portion of the battery shell is equipped with the lithium ion battery cover of the lithium ion battery cover.

[0016] The utility model discloses the beneficial effect is: when the abnormality of electric core leads to the gas production inside electric core, the pressure is too high, double lower plastic structure can guarantee the smooth of electric core internal gas, guaranteed the stability of explosion-proof valve opening, to improve the security of electric core;While can be applied in the design of inverted electric core after considering the corrosion reduction of explosion-proof valve. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the exploded view of the utility model;

[0018] Figure 2 It is the reverse view of the lower plastic of the utility model;

[0019] Figure 3 It is the reverse view of the lower plastic extension plate of the utility model;

[0020] Figure 4 It is the front view of the lower plastic extension plate of the utility model;

[0021] Figure 5 It is the main view of the utility model installed on battery shell;

[0022] Figure 6 It is Figure 5 the enlarged view of A in the middle;

[0023] Figure 7 It is Figure 5 the enlarged view of B in the middle;

[0024] Figure 8 It is the gas flow state schematic view of the utility model;

[0025] Figure 9 It is the gas flow state schematic view of prior art;

[0026] The drawings are explained as follows:

[0027] 1: battery cover plate;11, light aluminum sheet;111, light aluminum sheet positive pole through hole;112, light aluminum sheet negative pole through hole;12, positive pole column;13, negative pole column;14, sealing ring;15, positive pole injection molding;16, negative pole injection molding;17, explosion-proof valve;18, explosion-proof valve paste;19, lower plastic;191, lower plastic extension plate;1911, flow guide hole;192, lower plastic positive pole through hole;193, lower plastic negative pole through hole;194, buckle;195, card hole;2: pole group main body;21, support rib;22, exhaust space;23, flow guide structure;231, U-shaped flow guide plate;232, through hole;233, flow guide hole;3: battery shell. Detailed Implementation

[0028] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixed connection," and "fixed connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings and preferred embodiments.

[0032] like Figure 1 As shown, this utility model provides a structure composed of several parts, including an aluminum sheet 11, a positive electrode post 12, a negative electrode post 13, a sealing ring 14, a positive electrode injection molding 15, a negative electrode injection molding 16, an explosion-proof valve 17, an explosion-proof valve sticker 18, and a lower plastic sheet 19. In this structure, the positive electrode post 12 and the negative electrode post 13 pass sequentially through the lower plastic sheet's positive electrode through-hole 192 and negative electrode through-hole 193, and the aluminum sheet's positive electrode through-hole 111 and negative electrode through-hole 112, respectively. After assembling and fixing the lower plastic sheet 19, the sealing ring 14, the positive electrode post 12, the negative electrode post 13, and the aluminum sheet 11, the positive electrode injection molding 15 and the negative electrode injection molding 16 are used for fixation and positioning.

[0033] In order to ensure the gas flow of the lower plastic bottom, the lower plastic bottom is provided with a lower plastic extension plate 191, and a plurality of flow guide holes 1911 are arranged on the lower plastic extension plate, the flow guide holes correspond to the grating 20, and the flow guide holes are fixed with support ribs 21 on both sides, and the support ribs make the grating lower part and the lower plastic extension plate have an exhaust space 22. By changing the battery cover and adding a layer of lower plastic design, a gap for the first layer of explosion-proof valve opening hole is left for circulation, which ensures the smooth flow of gas and improves the opening stability of the explosion-proof valve, so that it can be blown at the normal opening pressure.

[0034] As an embodiment of the support rib, the height of the support rib is higher than the thickness of the grating, and after the lower plastic extension plate is fixed on the lower plastic bottom, the two support ribs are located on both sides of the grating and connected with the lower plastic, that is, the two support ribs are supported on the bottom of the lower plastic, and a certain space is supported between the grating and the lower plastic extension plate. Specifically, the height of the support rib is at least 0.5 mm greater than the thickness of the grating, so as to ensure sufficient support. The support rib is thickened, and a wall thickness of 1 mm is used to strengthen the support.

[0035] As another embodiment of the support rib, the distance between the two support ribs is less than the width of the grating, and after the lower plastic extension plate is fixed on the lower plastic bottom, the two support ribs are connected with the bottom of the grating. That is, the two support ribs are supported on the bottom of the grating, and compared with the first embodiment, the support rib is shorter, and a certain space can also be left between the grating and the lower plastic extension plate.

[0036] As an embodiment of the buckle structure, one end of the lower plastic extension plate is hinged with one end of the lower plastic, and the other end of the lower plastic extension plate is provided with a buckle 194, which is connected with the buckle hole 195 of the other end of the lower plastic. That is, one end of the lower plastic extension plate is connected with the lower plastic, and there is a connecting part between the two, and rotating the lower plastic extension plate can buckle the other side on the bottom of the lower plastic.

[0037] As another embodiment of the buckle structure, both ends of the lower plastic extension plate are provided with buckles, and the buckles are connected with the buckle holes of both ends of the lower plastic. That is, both ends of the lower plastic extension plate are provided with buckles, and the lower plastic extension plate and the lower plastic are separate, and can be fixed together through the buckles.

[0038] Further, in order to avoid the electrolyte from washing the pole piece, the bottom of the lower plastic extension plate is provided with a flow guide structure 23 located directly below the liquid injection hole of the aluminum sheet. By providing a barrier and flow guide structure below, direct washing of the electrolyte on the pole piece during liquid injection is avoided. Specifically, the flow guide structure includes a U-shaped flow guide plate 231, a through hole 232, and a flow guide hole 233, the through hole is provided on the lower plastic extension plate, both ends of the U-shaped flow guide plate are fixed on both ends of the through hole, and the flow guide hole is located on both sides of the U-shaped flow guide plate and communicates with the through hole. The electrolyte first impacts the flow guide plate and then flows into the pole piece from the flow guide holes on both sides, so that direct washing of the electrolyte on the pole piece can be avoided. In the embodiment, the U-shaped flow guide plate is arranged along the length direction of the lower plastic extension plate, and the flow guide holes are directed towards the width direction of the lower plastic extension plate.

[0039] The utility model discloses still a kind of battery, including pole group main body 2 and battery shell 3, pole group main body is installed in the battery shell, the upper portion of the battery shell is equipped with the lithium ion battery cover 1 as shown in Figure Figure 9 As shown, the battery cover in current design can produce gas when thermal safety fails, and the gas is discharged through the lower gasket opening below the explosion-proof valve. Since the cell is too close to the gasket, the exhaust is not smooth. Figure 8 As shown, the battery cover in the utility model design can discharge gas through the lower plastic extension plate (191) on both sides and the opening when thermal safety fails, and the gas flow is stronger than the existing design.

[0040] In addition, the design can also be applied to inverted cell design. If the existing design cover is used after the cell is inverted, it is more likely to block the flow of gas to the explosion-proof valve, so the design can make the opening pressure of the inverted cell more stable. However, it should be noted that the position of the explosion-proof valve in the longitudinal direction of the inverted cell needs to be paid attention to in order to prevent the influence of electrolyte corrosion on the opening pressure of the explosion-proof valve.

[0041] For those skilled in the art, without departing from the principles of the utility model, a number of improvements and refinements can be made, which should also be considered within the scope of protection of the utility model.

Claims

1. A lithium-ion battery cover, comprising an aluminum sheet, a positive terminal post, a negative terminal post, an explosion-proof valve, and a lower plastic layer, wherein the positive and negative terminal posts are fixed to the aluminum sheet by injection molding and riveting, and at least one terminal post module is insulated from the aluminum sheet; the aluminum sheet has an injection hole and a perforated hole for the explosion-proof valve; the explosion-proof valve is a thin aluminum sheet structure welded to the perforated hole; the lower part of the lower plastic layer has a grille corresponding to the explosion-proof valve; characterized in that: The bottom of the lower plastic section is provided with a lower plastic extension plate, and the lower plastic extension plate is provided with a plurality of guide holes. The guide holes correspond to the grille, and support ribs are fixed on both sides of the guide holes. The support ribs provide an exhaust space between the lower part of the grille and the lower plastic extension plate.

2. The lithium-ion battery cover according to claim 1, characterized in that: The height of the support rib is higher than the thickness of the grid. After the lower plastic extension plate is fixed to the bottom of the lower plastic, the two support ribs are located on both sides of the grid and connected to the lower plastic.

3. The lithium-ion battery cover according to claim 1, characterized in that: The distance between the two support ribs is less than the width of the grid. After the lower plastic extension plate is fixed to the bottom of the lower plastic, the two support ribs are connected to the bottom of the grid.

4. The lithium-ion battery cover according to claim 1, characterized in that: One end of the lower plastic extension plate is hinged to one end of the lower plastic, and the other end of the lower plastic extension plate has a buckle, which is connected to the buckle hole at the other end of the lower plastic.

5. The lithium-ion battery cover according to claim 1, characterized in that: Both ends of the lower plastic extension plate are provided with buckles, which are connected to the buckle holes at both ends of the lower plastic plate.

6. The lithium-ion battery cover according to claim 2, characterized in that: The height of the support rib is at least 0.5 mm greater than the thickness of the grid.

7. The lithium-ion battery cover according to claim 1, characterized in that: The bottom of the lower plastic extension plate is provided with a flow guiding structure, which is located directly below the injection hole on the aluminum sheet.

8. The lithium-ion battery cover according to claim 7, characterized in that: The flow guiding structure includes a U-shaped flow guiding plate, a through hole, and a flow guiding hole. The through hole is disposed on the lower plastic extension plate. The two ends of the U-shaped flow guiding plate are fixed to the two ends of the through hole. The flow guiding hole is located on both sides of the U-shaped flow guiding plate and communicates with the through hole.

9. The lithium-ion battery cover according to claim 8, characterized in that: The U-shaped guide plate is arranged along the length of the lower plastic extension plate, and the guide hole faces the width of the lower plastic extension plate.

10. A battery, comprising an electrode assembly body and a battery casing, wherein the electrode assembly body is housed within the battery casing, characterized in that: The upper part of the battery casing is equipped with a lithium-ion battery cover as described in any one of claims 1-9.

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