Battery structure and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a battery structure and electric equipment, the battery structure comprises a shell, a pole group and a first collector plate are arranged in the shell, the inner side end face of the first collector plate is connected with the pole group, the outer side end face of the first collector plate is connected with a pole column, and the pole column penetrates through the top of the shell. An insulating pad is arranged between the peripheral surface of the pole and the shell, and an insulating plate is arranged between the outer side end surface of the first collector plate and the shell; the middle of the first collector plate protrudes to form a boss, a groove matched with the boss is formed in the end face of the inner side of the pole, the boss is located in the groove and welded to the groove, and the projection face of the orthographic projection of the boss on the end face of the outer side of the pole is a welding face. According to the scheme, the middle part of the collector plate of the positive electrode is made into a boss structure, and the pole is made into a closed structure and is not provided with a liquid injection hole, so that the positive projection surfaces of the pole and the boss are welded once during laser welding.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery structure and electrical equipment. BACKGROUND

[0002] Lithium ion battery is a kind of electrochemical energy storage device, and its essence is a concentration cell, also known as "rocking chair battery". When charging, the voltage applied from outside makes lithium ions in the positive electrode deintercalate, flow through the separator to the negative electrode through electrolyte and intercalate, and at the same time, in order to maintain electrical neutrality, the electrons of the positive electrode also flow to the negative electrode through the external circuit; when discharging, lithium ions deintercalate from the negative electrode, flow to the positive electrode through the separator through electrolyte, and the negative electrode electrons also flow to the positive electrode through the external circuit.

[0003] Chinese patent CN202411153939.1 discloses a cylindrical battery, its preparation method and electrical device, relating to the technical field of cylindrical battery. The present application forms a group of first tab areas on the first end of the winding core, each group of first tab areas has a plurality of positive electrode tabs arranged along the radial direction of the winding core; a group of second tab areas are formed on the second end of the winding core, each group of second tab areas has a plurality of negative electrode tabs arranged along the radial direction of the winding core. Compared with full-tab technology, the number of tabs can be greatly reduced, the number of tab die cutting can be reduced, the process can be optimized, and the production efficiency can be improved; the gap between the winding core and the current collector plate can also be increased, which is beneficial to the flow of electrolyte and can improve the wettability of the electrolyte on the pole piece. Compared with conventional multi-tab technology, the number of tabs on the pole piece can be effectively increased, so that the tabs are dispersed on the entire pole piece, which is beneficial to the transmission of electrons during the charging and discharging process of the battery, improves the overcurrent capacity of the battery, reduces the overcurrent temperature rise of the battery, and also reduces the internal resistance of the battery. The battery structure needs to be improved.

[0004] The utility model overcomes the shortcomings of prior art, provides a kind of battery structure and electrical equipment. UTILITY MODEL CONTENTS

[0005] The utility model mainly aims at providing a kind of battery structure, including shell, the shell inside is equipped with pole group and first current collecting plate, the inside end surface of the first current collecting plate is connected with the pole group, the outside end surface of the first current collecting plate is connected with pole, the pole is through the top of the shell, and the insulating pad is equipped between the circumferential surface of the pole and the shell, and the insulating plate is equipped between the outside end surface of the first current collecting plate and the shell;

[0006] The middle part of the first current collecting plate is protruded to form a boss, the inside end surface of the pole is equipped with the groove matched with the boss, the boss is located in the groove, the boss is welded with the groove, and the boss is orthographically projected on the projection surface of the outside end surface of the pole as a welding surface.

[0007] Optionally, the boss is cylindrical, the entrance of the groove is larger than the cross section of the boss, the groove is tapered, and the bottom of the groove is the same size as the top of the boss.

[0008] Optionally, the outer side end surface of the first current collecting plate is provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs are distributed in a circle with the boss as the center.

[0009] Optionally, the first current collecting plate is provided with a plurality of strip-shaped holes, and the plurality of strip-shaped holes are distributed in a circle with the boss as the center.

[0010] Optionally, the welding surface is an annular groove, and the outer diameter of the annular groove is matched with the cross section of the boss.

[0011] Optionally, the insulating plate is annular and is provided with a through hole in the middle, the pole passes through the through hole, one end surface of the insulating plate abuts against the first current collecting plate, and the other end surface abuts against the inner side of the top of the shell.

[0012] Optionally, the outer side circumferential surface of the pole is provided with a first limiting groove, the insulating pad is annular and columnar, the outer side circumferential surface of the insulating pad is provided with a second limiting groove, the inner side circumferential surface of the insulating pad is a closed end, the inner side circumferential surface of the insulating pad is tightly clamped into the first limiting groove, the top of the shell is provided with a mounting hole, the pole and the insulating pad are located in the mounting hole, and the edge of the mounting hole is tightly clamped into the second limiting groove.

[0013] Optionally, the bottom of the shell is provided with a bottom cover and a second current collecting plate, the bottom cover is fixedly connected with the shell, the bottom cover is provided with a liquid injection hole, the liquid injection hole is provided with a sealing plug, the bottom cover is provided with a sealing cover, the sealing cover covers the part of the sealing plug located outside the bottom cover, and the sealing cover is sealingly connected with the bottom cover.

[0014] The second current collecting plate is arranged in the shell and located between the bottom cover and the pole group.

[0015] Optionally, the middle part of the second current collecting plate is provided with a liquid inlet hole, a plurality of reinforcing ribs extend from the liquid inlet hole to the periphery, the end surface of the second current collecting plate is provided with a plurality of strip-shaped holes, the strip-shaped holes are located on the two sides of the reinforcing ribs, the circumferential surface of the second current collecting plate extends a connecting surface of a predetermined height perpendicularly to the end surface of the second current collecting plate, and the connecting surface is fixedly connected with the inner wall of the shell.

[0016] The utility model also provides a kind of electric equipment, including above-mentioned battery structure.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The battery structure provided by the utility model makes the middle part of the current collecting plate of the positive pole into a boss structure, and makes the pole post into a closed structure, does not have a liquid injection hole, only needs to weld the orthographic projection face of the pole post and the boss once during laser welding, and the pole post with the liquid injection hole needs to be welded twice during plug sealing of the conventional pole post, the scheme can reduce the welding times, thereby reducing the production time and cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are schematic and not intended to be limiting of the embodiments, and in which like reference numerals refer to like elements in the various figures, unless otherwise specified, the figures are not necessarily to scale, as human limbs would not fit within the small space of a figure.

[0020] Figure 1 For the battery structure embodiment schematic diagram of the utility model;

[0021] Figure 2 For the battery structure embodiment top view of the utility model;

[0022] Figure 3 For the battery structure embodiment cross-sectional view of the utility model;

[0023] Figure 4 For the battery structure embodiment A place local enlarged view of the utility model;

[0024] Figure 5 For the battery structure embodiment B place local enlarged view of the utility model;

[0025] Figure 6 For the battery structure embodiment first current collecting plate schematic diagram of the utility model;

[0026] Figure 7 For the battery structure embodiment bottom cover and second current collecting plate schematic diagram of the utility model.

[0027] REFERENCE SIGNS:

[0028] 1-outer shell;2-pole group;3-first current collecting plate;31-boss;32-stiffener;33-strip hole;4-pole post;41-groove;42-welding surface;43-first limiting groove;5-insulating pad;51-second limiting groove;6-insulating plate;61-through hole;7-second current collecting plate;71-liquid inlet hole;72-connection surface;8-bottom cover;81-sealing plug;82-sealing cover. DETAILED DESCRIPTION

[0029] For the convenience of understanding the utility model, the utility model will be explained in more detail below in combination with the drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in the specification are for illustrative purposes only. In the description of the utility model, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating relative importance, or implying the number of the indicated technical features. Therefore, unless otherwise specified, the features with "first", "second" can explicitly or implicitly include one or more of the features; the meaning of "multiple" is two or more. The term "include" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof can be present or added.

[0030] In addition, unless otherwise explicitly specified and limited, the terms "mount", "connected", "connected" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements. All technical and scientific terms used in the specification have the same meaning as understood by the person skilled in the art belonging to the technical field of the utility model. The terms used in the specification of the utility model are only for the purpose of describing the specific embodiments, and are not applicable to limit the utility model. The term "and / or" used in the specification includes any and all combinations of one or more related listed items.

[0031] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict between them.

[0032] As Figures 1-7 shown, the battery structure embodiment provided by the utility model is shown.

[0033] Please refer to Figures 1-7 , the embodiment includes a shell 1, the shell 1 inside is equipped with pole group 2 and first current collecting plate 3, the inner side end surface of first current collecting plate 3 is connected with pole group 2, the outer side end surface of first current collecting plate 3 is connected with pole 4, pole 4 penetrates the top of shell 1, and the circumferential surface between pole 4 and shell 1 is provided with insulating pad 5, and the outer side end surface between first current collecting plate 3 and shell 1 is provided with insulating plate 6.

[0034] The middle part of the first current collecting plate 3 is provided with a boss 31, the inner side end face of the pole 4 is provided with a groove 41 matched with the boss 31, the boss 31 is located in the groove 41, the boss 31 is welded with the groove 41, and the normal projection of the boss 31 on the projection face of the outer side end face of the pole 4 is a welding face 42.

[0035] The shell 1 is integrally formed as a sealed structure, and the shell 1 mainly includes a hard shell such as a steel shell, an aluminum shell, and a nickel-plated iron shell, and a soft package such as an aluminum plastic film. The pole 4 is a component for connecting the battery and an external circuit, and the pole 4 is led out from an electrode inside the battery to provide an interface for input and output of current. In a lithium ion battery, the positive and negative poles are respectively connected to the current collectors of the positive and negative electrodes, that is, the first current collecting plate 3 and the second current collecting plate 7 in the embodiment. The pole 4 is usually made of a material with good electrical conductivity and corrosion resistance. A conventional battery pole is usually provided with a liquid injection hole for injecting electrolyte. After the electrolyte is injected, the liquid injection hole needs to be plugged by a plug, and the top and bottom of the plug are welded twice by laser welding. In the embodiment, the liquid injection hole 81 is arranged in the bottom cover of the negative electrode, and the pole 4 of the positive electrode is a sealed end without a liquid injection hole. The welding of the pole 4 and the boss 31 of the first current collecting plate 3 only needs to be welded once on the contact surface, thereby reducing the welding times of the positive pole 4, simplifying the production process, and improving the production efficiency.

[0036] The pole group 2 is a core component of the lithium ion battery, and is usually composed of a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet and the negative electrode sheet are main places for electrochemical reaction of the battery, and the separator is located between the positive and negative electrode sheets to play a role of isolating the positive and negative electrodes, preventing short circuit, and allowing lithium ions to pass. The positive electrode sheet contains positive active material (such as lithium iron phosphate and ternary material), conductive agent (such as carbon black), and binder (such as polyvinylidene fluoride), which are uniformly mixed and coated on an aluminum foil current collector; the negative electrode sheet is mainly composed of negative active material (such as graphite), conductive agent, and binder, which are coated on a copper foil current collector.

[0037] In an embodiment, the boss 31 of the first current collecting plate 3 is cylindrical, the entrance of the groove 41 of the pole 4 is larger than the cross section of the boss 31, and the groove 41 is tapered, so that the boss 31 of the first current collecting plate 3 is assembled with the groove 41 of the pole 4. The bottom surface of the groove 41 is matched with the top surface of the boss 31 in size.

[0038] Further, the outer side end face of the first current collecting plate 3 is provided with a plurality of reinforcing ribs 32, and the plurality of reinforcing ribs 31 are distributed in a circle with the boss 31 as the center. The reinforcing ribs 31 are used to enhance the strength of the first current collecting plate 3. In addition, the first current collecting plate 3 is provided with a plurality of strip-shaped holes 33, and the plurality of strip-shaped holes 33 are distributed in a circle with the boss 31 as the center. The strip-shaped holes 33 are used to disperse the stress generated when the first current collecting plate 3 is welded with the pole 4.

[0039] Further, the welding surface 42 of the pole 4 is a ring-shaped groove, the outer diameter of which matches the cross-sectional size of the boss 31, and the ring-shaped groove is used to limit the welding area, and the first current collector plate 3 is used to collect and conduct the current generated by the battery reaction, and the current is conducted to the external circuit through the pole 4 to realize the output and utilization of the electric energy.

[0040] In an embodiment, the insulating plate 6 is ring-shaped, has a through hole 61 in the middle through which the pole 4 passes, and abuts against the first current collector plate 3 at one end and against the inner side of the top of the shell 1 at the other end. The insulating plate 6 is designed separately from the pole 4, which makes the production process easier to assemble. The insulating plate 6 is used to separate the shell 1 and the first current collector plate 3 to prevent short circuit, and also protects the battery structure from being rubbed and pressed by the internal components of the battery due to external force and vibration, thereby protecting the integrity of the battery structure.

[0041] In an embodiment, the outer side of the pole 4 is provided with a first limiting groove 43, the insulating pad 5 is ring-shaped and columnar, the outer side of the insulating pad 5 is provided with a second limiting groove 51, the inner side of the insulating pad 5 is closed, and the inner side of the insulating pad 5 is tightly clamped into the first limiting groove 43. The top of the shell 1 is provided with a mounting hole, the pole 4 and the insulating pad 5 are located in the mounting hole, and the edge of the mounting hole is tightly clamped into the second limiting groove 43, so that the shell 1 remains in a sealed state. The insulating pad 5 is used to isolate the pole 4 and the shell 1 to avoid short circuit.

[0042] In an embodiment, the bottom of the shell 1 is provided with a bottom cover 8 and a second current collector plate 7. The bottom cover 8 is fixedly connected to the shell 1, is provided with a liquid injection hole, and is provided with a sealing plug 81 in the liquid injection hole. The bottom cover 8 is provided with a sealing cover 82, which covers the part of the sealing plug 81 located outside the bottom cover 8, and the sealing cover 82 is sealingly connected to the bottom cover 8. The second current collector plate 7 is located inside the shell 1, between the bottom cover 8 and the pole group 2, and is used to collect and conduct the current.

[0043] Specifically, the second current collector plate 7 is provided with a liquid inlet hole 71 in the middle, a plurality of reinforcing ribs extending from the liquid inlet hole 71, and a plurality of strip-shaped holes in the end face of the second current collector plate 7, which are located on both sides of the reinforcing ribs. The peripheral surface of the second current collector plate 7 extends a predetermined height of the connecting surface 72 perpendicular to the end face of the second current collector plate 7, and the connecting surface 72 is fixedly connected to the inner wall of the shell 1, which can be connected by welding. The reinforcing ribs and the strip-shaped holes have similar effects as the reinforcing ribs 32 and the strip-shaped holes 33 of the first current collector plate 3.

[0044] The electrolyte is injected into the inside of the battery shell 1 through the injection hole, and the electrolyte is a key component of the lithium ion battery and is a medium for ion transmission between the positive and negative electrodes in the battery.

[0045] The utility model further provides a kind of electric equipment embodiment, including above-mentioned battery structure embodiment, electric equipment can be battery pack, new energy automobile, 3C electronic product etc.

[0046] In conclusion, the battery structure provided by the utility model is made into boss structure in the middle of the current collector plate of positive pole, and the pole post is made into closed structure, without injection hole, only the orthographic projection surface of pole post and boss needs to be welded once when laser welding, while the pole post with injection hole needs to be welded twice when sealing by plug pin, the present scheme can reduce welding times, thereby reduce production time and cost.

[0047] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than limit them; under the idea of the utility model, technical features in the above embodiments or different embodiments can also be combined, steps can be implemented in any order, and there are many other changes of different aspects of the utility model as described above, which are not provided in details for simplicity; although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of technical features; and these modifications or replacements do not make the essence of corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A battery structure, characterized by, The battery structure comprises a shell, a pole group and a first current collecting plate inside the shell, an inner side end surface of the first current collecting plate is connected with the pole group, an outer side end surface of the first current collecting plate is connected with a pole post, the pole post penetrates through a top of the shell, an insulating pad is arranged between a peripheral surface of the pole post and the shell, and an insulating plate is arranged between the outer side end surface of the first current collecting plate and the shell. A middle part of the first current collecting plate is protruded to form a boss, an inner side end surface of the pole post is provided with a groove matched with the boss, the boss is located in the groove, the boss and the groove are welded, and a normal projection of the boss on a projection surface of the outer side end surface of the pole post is a welding surface.

2. The battery structure of claim 1, wherein The boss is cylindrical, an entrance of the groove is larger than a cross section of the boss, the groove is tapered, and a bottom surface of the groove is matched with a top surface of the boss in size.

3. The battery structure of claim 1, wherein The outer side end surface of the first current collecting plate is provided with a plurality of reinforcing ribs, and the reinforcing ribs are distributed in a circle with the boss as a center.

4. The battery structure of claim 1, wherein The first current collecting plate is provided with a plurality of strip-shaped holes, and the strip-shaped holes are distributed in a circle with the boss as a center.

5. The battery structure of claim 1, wherein The welding surface is an annular groove, and an outer diameter of the annular groove is matched with a cross section of the boss in size.

6. The battery structure of claim 1, wherein The insulating plate is annular and is provided with a through hole in a middle part, the pole post penetrates through the through hole, one end surface of the insulating plate abuts against the first current collecting plate, and the other end surface abuts against an inner side of the top of the shell.

7. The battery structure of claim 1, wherein An outer side peripheral surface of the pole post is provided with a first limiting groove, the insulating pad is annular and columnar, an outer side peripheral surface of the insulating pad is provided with a second limiting groove, an inner side peripheral surface of the insulating pad is a closed end, the inner side peripheral surface of the insulating pad is tightly clamped into the first limiting groove, the top of the shell is provided with a mounting hole, the pole post and the insulating pad are located in the mounting hole, and an edge of the mounting hole is tightly clamped into the second limiting groove.

8. The battery structure of claim 1, wherein, A bottom cover and a second current collecting plate are arranged at a bottom of the shell, the bottom cover is fixedly connected with the shell, the bottom cover is provided with a liquid injection hole, a sealing plug is arranged in the liquid injection hole, the bottom cover is provided with a sealing cover, the sealing cover covers a part of the sealing plug located outside the bottom cover, and the sealing cover is sealingly connected with the bottom cover. The second current collecting plate is arranged inside the shell and between the bottom cover and the pole group.

9. The battery structure of claim 8, wherein, A middle part of the second current collecting plate is provided with a liquid inlet hole, a plurality of reinforcing ribs are extended from the liquid inlet hole to all directions, an end surface of the second current collecting plate is provided with a plurality of strip-shaped holes, the strip-shaped holes are located on both sides of the reinforcing ribs, a peripheral surface of the second current collecting plate is extended to a connecting surface of a predetermined height perpendicularly to the end surface of the second current collecting plate, and the connecting surface is fixedly connected with an inner wall of the shell.

10. An electric device, characterized by The battery structure comprises the battery structure according to any one of claims 1 to 9.

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