Inverted extremely-simple battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to an inverted extremely-simple battery cell. The battery comprises a cover plate, a shell, a core package and an elastic flow passing body, wherein the cover plate is provided with a pole; the cover plate and the shell are integrally formed, and a mounting space allowing the core package to be inserted therein is formed in the cover plate and the shell; the core cladding is arranged in the mounting space, one end of the elastic flow passing body in the elastic direction is welded with the core cladding, and the other end of the elastic flow passing body abuts against the pole; and the locking piece is used for driving the core cladding to move towards the direction close to the pole so as to compress the elastic fluid. According to the present invention, the elastic flow-passing body is adopted to replace the tab and the adapter sheet in the traditional cell, the cover body and the shell are designed to be the integrated structure, the cover body and the shell are inversely installed during the installation, and the core package abuts against the cover body so as to effectively reduce the distance between the core package and the cover plate, such that the ratio of the active material can be increased, and the N / P ratio and the energy density of the cell can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a flip type minimal electric core. BACKGROUND

[0002] The existing electric core is formed by stamping the electric core shell, and then the cover plate is stamped and assembled, and then the electric core is laser welded together. This method requires pre-welding of the tab, laser welding of the tab and adapter piece, and laser welding of the electric core adapter piece on the electric core pole. This traditional method has many welding procedures, is complex, has high investment cost, low N / P of the electric core, and low energy density, which has begun to restrict the further improvement of the performance of the electric core.

[0003] The patent document with publication number CN220914505U discloses a lithium battery, which includes a shell, a cover plate detachably covering the shell and having a pole thereon, a roll core disposed in the shell and having a tab thereon, and an elastic overflow body. The elastic overflow body is disposed between the cover plate and the roll core, one end of the elastic overflow body is disposed on the end of the pole facing the roll core, the other end of the elastic overflow body abuts on the tab, and the elastic overflow body is elastically deformed under pressure.

[0004] In the prior art, the roll core tab and the cover plate pole are connected by the elastic overflow body, which replaces the adapter piece to avoid the problem of damage caused by bending of the adapter piece. However, it still cannot effectively improve the performance of the electric core. The inventor analyzes the reason as follows: the cover plate and the shell are still separate, so first, when the cover plate is installed to the shell, the tab on the roll core is indispensable in order to ensure that the elastic overflow body provided on the cover plate can be in electrical communication with the roll core, otherwise there may be a problem that the elastic overflow body abuts on the non-active part of the roll core, such as the separator, and the electrical communication is not smooth or even impossible. The existence of the roll core tab, on the one hand, makes it consistent with the traditional electric core, and the tab still occupies the internal space and weight of the electric core, so that the proportion of active material participating in energy storage cannot be improved, thereby the N / P ratio and energy density of the electric core cannot be improved. On the other hand, it at least includes welding of the roll core and the tab, welding of the cover plate and the elastic overflow body, and the welding points are more, so that the internal resistance of the electric core cannot be reduced, which also affects the energy efficiency. Second, in order to install the cover plate, the shell needs to reserve a space for installing the cover plate, and the height of this installation space cannot be adjusted or compressed, so that the filling space of the active material cannot be improved, and the energy density cannot be improved. UTILITY MODEL CONTENTS

[0005] The utility model solves the above problems and provides a flip type minimal electric core which can effectively improve the N / P ratio and energy density of the electric core.

[0006] The technical scheme for solving the problem of the utility model discloses provides an inverted type minimal electric core, including cover plate, shell, core package and elastic fluid, the cover plate is equipped with the pole; The cover plate and the shell are integrally formed, the cover plate and the shell form the installation space that can be inserted to the core package in, the core package is arranged in the installation space, and the elastic fluid elastic direction one end and the core package are welded, and the other end and the pole abut; Still include for driving the core package to the direction of being close to the pole moves, so that the locking piece of elastic fluid compression.

[0007] As the preferred utility model, the shell is provided with an opening for inserting the core package at one end away from the cover plate, and a bottom plate for sealing the opening.

[0008] As the preferred utility model, the bottom plate forms the locking piece.

[0009] As the preferred utility model, the locking piece includes a connecting hole provided on the bottom plate and an abutting column inserted into the connecting hole, and the core package abuts against the abutting column.

[0010] As the preferred utility model, the connecting hole and the abutting column are threadedly connected.

[0011] As the preferred utility model, the bottom plate is provided with a plurality of connecting holes, and the plurality of connecting holes are symmetrically arranged with the center axis of the core package as the center axis.

[0012] As the preferred utility model, the center axis of at least one connecting hole coincides with the center axis of the elastic fluid.

[0013] As the preferred utility model, the bottom plate and the shell are welded, and at least one connecting hole forms a lithium supplementing liquid injection hole.

[0014] As the preferred utility model, the elastic fluid includes an abutting piece for abutting against the pole and an elastic member arranged between the core package and the abutting piece.

[0015] As the preferred utility model, the cover plate is provided with an explosion-proof valve area.

[0016] The utility model discloses the beneficial effect:

[0017] 1. In this application, first, the elastic fluid is directly welded on the core package. Compared with the prior art, the core package and the elastic fluid abut and need to be additionally provided with the setting mode of the tab. The pre-welding ensures the electrical communication of the core package and the elastic fluid, so the setting of the tab can be cancelled at this time, that is, the elastic fluid directly replaces the traditional tab and the adapter piece in the battery. Under the same size of the battery, the height size and weight required by the compressible elastic fluid in the battery are reduced compared with the traditional tab and the adapter piece, so that the proportion of active material in the battery can be improved, thereby effectively improving the N / P ratio and energy density of the battery. At the same time, based on the omission of the tab and the setting of the elastic fluid, more than two batch laser weldings are saved in the application compared with the traditional battery, the welding points are reduced to reduce the internal resistance of the battery, the energy loss is reduced, and the energy efficiency of the battery can be further improved.

[0018] Secondly, on the basis of directly welding the elastic fluid on the core package, the cover and the shell are designed as an integrated structure, and the core package is tightly abutted against the cover during installation. Compared with the prior art, the elastic fluid can be effectively compressed (in the prior art, due to the fixed height of the reserved cover installation space and the fixed distance between the cover and the core package, the elastic fluid cannot be completely compressed, but may still expand to connect the cover pole and the core package), further reducing the height size occupied by the elastic fluid to improve the proportion of active material and improve the energy density of the battery; at the same time, the elastic vibration of the elastic fluid can be limited, and the damage caused by vibration during use of the battery can be reduced.

[0019] 2. In some embodiments, the locking member is arranged on the bottom plate, and the elastic fluid is compressed by driving the core package. Compared with the prior art, the structure of the pole is not affected, the subsequent use of the pole is not affected, and the compression of the elastic fluid is ensured to reduce the occupied space and ensure the pressure and flow of the elastic fluid between the cover pole and the core package. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure diagram of an inverted minimalist battery;

[0021] Figure 2 It is a structure diagram of another perspective of an inverted minimalist battery;

[0022] Figure 3 It is a structure diagram of a core package and an elastic fluid in an inverted minimalist battery;

[0023] In the figure: cover plate 1, pole 11, explosion-proof valve area 12, shell 2, bottom plate 3, core package 4, elastic fluid 41, abutting piece 411, elastic member 412. DETAILED DESCRIPTION

[0024] The technical scheme of the utility model will be further described in conjunction with the drawings of the utility model, but the utility model is not limited to these embodiments.

[0025] An inverted type minimal electric core, as shown in Figure 1 and Figure 2 , comprises a core package 4 and a shell for sealing the core package 4.

[0026] The shell comprises a cover plate 1, a shell body 2 and a bottom plate 3, in the prior art, the shell body 2 and the bottom plate 3 are usually integrally formed, the core package 4 is inserted into the shell, and then the cover plate 1 is welded; in the present application, the structure of the shell is adjusted, the shell body 2 and the cover plate 1 are integrally formed, the core package 4 is inserted into the shell, and then the bottom plate 3 is installed, so it is an inverted type electric core.

[0027] The cover plate 1 is provided with a pole 11, the pole 11 penetrates through the cover plate 1, one end of the pole 11 faces the shell body 2 and is used for subsequent communication with the core package 4, the other end of the pole 11 faces outward and is used for subsequent communication with an external circuit, so that the core package 4 can communicate with the external circuit through the pole 11. The mode of arranging the pole 11 is not limited, and the conventional riveting fixation in the prior art can be adopted, and the specific installation mode will not be described herein; the number of the poles 11 is not limited, and usually includes positive poles and negative poles. In addition, the cover plate 1 is also provided with an anti-explosion valve area 12 consistent with the conventional electric core, and the structure is consistent with the prior art, which will not be described herein.

[0028] The structure of the core package 4 is not limited and can be consistent with the prior art, and it is usually formed by winding a positive plate, a negative plate and a diaphragm; the shape of the core package 4 is not limited and can be square or cylindrical.

[0029] In order to communicate the core package 4 with the pole 11 on the cover plate 1 and thus communicate with the external circuit, the conventional electric core will weld a tab on the pole of the core package 4, and then weld a switching piece on the tab. In the present application, as shown in Figure 1 , the structure of the tab and the switching piece is replaced by an elastic fluid 41, one end of the elastic fluid 41 in the elastic direction is welded on the core package 4, and at least one welding process is saved. The welding position of the elastic fluid 41 on the core package 4 is consistent with the position of the core package 4 originally used for welding the tab. The number of the elastic fluid 41 is consistent with the number of the poles 11, and usually two are provided for abutting the positive poles and the negative poles.

[0030] The elastic fluid 41 refers to a structure capable of elastic deformation in the elastic direction and having a fluid passing function, which is made of materials such as nickel and aluminum which have good conductivity and are easy to weld, and can be in the shape of a spiral spring or a columnar spring. In other embodiments of the elastic fluid 41, it can also be Figure 3As shown, the elastic overfluid 41 includes an abutting piece 411 and an elastic piece 412 arranged between the core pack 4 and the abutting piece 411, both of which are made of a material with good electrical conductivity and are integrally formed without welding points. The abutting piece 411 has an area substantially the same as the bottom area of the pole 11, which provides a large abutting area and ensures the communication between the elastic overfluid 41 and the pole 11; the elastic piece 412 provides an elastic effect, adjusts the gap difference between the core pack 4 and the pole 11, and thus effectively guarantees the pressure and overfluid. The elastic piece 412 can be a spring with an outer diameter slightly smaller than the diameter of the abutting piece 311, the central axis of which coincides with the central axis of the abutting piece 411; or a plurality of springs with extremely small outer diameters, which are arranged in a ring around the center of the abutting piece 411. The former is preferred, because the elastic piece 412 has fewer welding points with the core pack 4 and a large area, which makes it easier to control the welding quality and reduces the possibility of false welding or poor contact; and the current distribution is more uniform, reducing the influence of local resistance.

[0031] When the cell is inverted, the core pack 4 is inserted into the mounting space formed by the integrally formed cover plate 1 and the shell 2 from bottom to top in the direction of Figure 1 , and the free end of the elastic overfluid 41 at the top of the core pack 4 can abut against one end of the pole 11 facing the shell 2, thereby communicating with the pole 11. Continuing to move the core pack 4 upward can compress the elastic overfluid 41, which on the one hand further adjusts the gap difference between the core pack 4 and the pole 11 to guarantee the pressure and overfluid; and on the other hand compresses the space between the core pack 4 and the pole 11. Under the same size of the shell, the compression of the space between the core pack 4 and the pole 11 means that the space for accommodating the core pack 4 can be increased, a larger core pack 4 can be used, the proportion of active material can be increased, and the N / P ratio and energy density of the battery cell can be improved.

[0032] The structure of the locking piece is not limited. In some embodiments of the locking piece, the bottom plate 3 of the shell can be directly used as the locking piece. Specifically, after the core pack 4 is inserted into the mounting space, the bottom plate 3 is further inserted, the bottom end of the core pack 4 abuts against the bottom plate 3, the bottom plate 3 is driven to move toward the pole 11 to move the core pack 4, and after the elastic overfluid 41 is appropriately compressed, the side edge of the bottom plate 3 is welded and sealed with the shell 2. In order to ensure the accuracy of the moving direction of the bottom plate 3 and thus the accuracy of the compression direction of the elastic overfluid 41, a guide groove parallel to the elastic direction of the elastic overfluid 41 in the length direction can be arranged in the shell 2, and a guide block inserted into the guide groove can be arranged on the bottom plate 3.

[0033] In other embodiments of the locking piece, such as Figure 1 and Figure 2As shown, the bottom plate 3 serves as a fixed structure, and the locking member includes a connecting hole arranged on the bottom plate 3 and an abutting column 5 inserted into the connecting hole, and the core pack 4 abuts against the abutting column 5. Specifically, after the core pack 4 is inserted into the installation space, the bottom plate 3 is first installed and then welded and sealed with the shell 2; then the abutting column 5 is inserted into the connecting hole, one end of the abutting column 5 passes through the connecting hole and abuts against the core pack 4, and the abutting column 5 drives the core pack 4 to move towards the polar column 11 to compress the elastic overflow member 41.

[0034] The number and position of the connecting holes are not limited, and in some embodiments, the bottom plate 3 is provided with a plurality of connecting holes, and the plurality of connecting holes are arranged symmetrically with the central axis of the core pack 4 as the central axis. For example, when the core pack 4 is square, two connecting holes can be arranged, and the two connecting holes are symmetrically arranged with the central axis of the core pack 4 as the central axis, and then the abutting columns 5 in the two connecting holes jointly move the core pack 4, which can ensure the balance of the driving of the core pack 4 and play the role of secondary leveling of the core pack 4. Four connecting holes can also be arranged, and two of the connecting holes are symmetrically arranged with the central axis of the core pack 4 as the central axis.

[0035] In the embodiments in which a plurality of connecting holes are arranged, in some embodiments, the central axes of the two connecting holes are respectively in the same straight line as the central axes of the two elastic overflow members 41, so that the moving direction of the abutting column 5 coincides with the compression direction of the elastic overflow member 41, to ensure the accuracy of the compression of the elastic overflow member 41.

[0036] In the embodiments in which a plurality of connecting holes are arranged, in some embodiments, at least one connecting hole forms a lithium supplementing and liquid injecting hole. Specifically, during installation, the core pack 4 is first driven by the abutting columns 5 in the other connecting holes, and after being driven to a suitable position, lithium is supplemented and liquid is injected into the shell through the remaining connecting hole, and then the abutting column 5 is inserted into the connecting hole to abut and seal, and this connecting hole can play the role of lithium supplementing and liquid injecting.

[0037] The structure of the abutting column 5 is not limited, and in some embodiments, the abutting column 5 can be a character-shaped. In other embodiments, the abutting column 5 is T-shaped, including an insertion part for insertion into the connecting hole and a mounting part left outside the shell. A sealing ring is arranged between the mounting part and the bottom plate 3 to prevent liquid leakage. On this basis, in some embodiments, the control connecting hole is also T-shaped, and includes a wide mouth with a relatively wide diameter and a narrow mouth with a relatively narrow diameter in sequence from the bottom plate 3 to the shell 2, and when the insertion part of the abutting column 5 is inserted into the narrow mouth, the mounting part can be inserted into the wide mouth, which is convenient for welding and also avoids affecting the flatness of the appearance of the battery cell due to the protrusion of the mounting part from the bottom plate 3.

[0038] The movable connection mode of the connecting hole and the abutting column 5 is not limited, and in some embodiments, the connecting hole and the abutting column 5 are threadedly connected, and the abutting column 5 is fixed by the threaded structure.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. An inverted minimal cell, comprising a cover plate (1), a shell (2), a core package (4), and an elastic overfluid (41), the cover plate (1) being provided with a pole (11); characterized in that: the cover plate (1) is integrally formed with the shell (2), and the cover plate (1) and the shell (2) form an installation space for inserting the core package (4) therein; the core package (4) is arranged in the installation space, and one end of the elastic overfluid (41) in an elastic direction is welded to the core package (4) and the other end abuts against the pole (11); further comprising a locking member for driving the core package (4) to move towards the pole (11) so as to compress the elastic overfluid (41).

2. The inverted minimal cell of claim 1, wherein: an opening for inserting the core package (4) is arranged at an end of the shell (2) away from the cover plate (1), and a bottom plate (3) is arranged for sealing the opening.

3. The inverted minimal cell of claim 2, wherein: the bottom plate (3) forms the locking member.

4. The inverted minimal cell of claim 2, wherein: the locking member comprises a connecting hole arranged in the bottom plate (3) and an abutting column (5) inserted into the connecting hole, and the core package (4) abuts against the abutting column (5).

5. The inverted minimal cell of claim 4, wherein: the connecting hole is threadedly connected with the abutting column (5).

6. The inverted minimal cell of claim 4, wherein: the bottom plate (3) is provided with a plurality of connecting holes, and the plurality of connecting holes are symmetrically arranged with the center axis of the core package (4) as the center axis.

7. The inverted minimal cell of claim 4 or 6, wherein: the center axis of at least one connecting hole coincides with the center axis of the elastic overfluid (41).

8. The inverted minimal cell of claim 4 or 6, wherein: the bottom plate (3) is welded to the shell (2), and at least one connecting hole forms a lithium supplementing liquid injection hole.

9. The inverted minimal cell of claim 1, wherein: the elastic overfluid (41) comprises an abutting piece (411) for abutting against the pole (11) and an elastic member (412) arranged between the core package (4) and the abutting piece (411).

10. The inverted minimal cell of claim 1, wherein: the cover plate (1) is provided with an explosion-proof valve area (12).

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