CN215989124U - Pin and top cover assembly and battery - Google Patents

Abstract

The utility model relates to the technical field of batteries, and discloses a pin which comprises a pin body and a pole protection sheet. The pin body is the structure of buckling, including fixed connection's first fixed part and second fixed part, and first fixed part can be used for connecting the battery top cap, and the second fixed part can be used for two fixed book cores simultaneously to this realizes that two sides of two book core full utmost point ears are drawn forth, can effectively improve the power supply of battery. In addition, the pole protection sheet is connected to the second fixing part, and a gap is reserved between the pole protection sheet and the first fixing part, so that short circuit caused by the fact that the first fixing part is extruded by the winding core is avoided, and the safety of the battery can be guaranteed. The utility model also discloses a top cover assembly which comprises a battery top cover and the pins, wherein the battery top cover is connected with the two pins so as to be capable of being adapted to the two full-lug winding cores. The utility model also discloses a battery, which comprises two winding cores and a top cover assembly, can effectively reduce the ohmic impedance of the winding cores, improves the power supply power, and is suitable for high-power scenes.

Description

Pin and top cover assembly and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a pin and cover plate assembly and a battery.

Background

With the rapid development of new energy technologies, lithium batteries are widely used in various industries as main energy carriers and power sources, and have higher and higher requirements on lithium batteries, high required capacity, good safety performance and long service life.

At present, the square lithium ion battery mainly comprises a battery shell, a battery cover plate, positive and negative electrode materials, a diaphragm, electrolyte and other components. The positive and negative electrode materials and the current collectors form positive and negative electrode plates, the positive and negative electrode plates and the diaphragm form a battery roll core, the positive electrode plate of the battery is provided with a positive electrode lug, the negative electrode plate of the battery is provided with a negative electrode lug, the roll core is connected with a battery cover plate through the led positive and negative electrode lugs, the roll core is placed in the shell, and the cover plate and the shell are sealed to form the battery. The positive and negative electrode tabs of the battery roll core are led out from the same side and from both sides, and the roll core with the tabs led out from the same side cannot be designed into a full tab, so that higher power cannot be improved under the same condition. Although the full-lug can be adopted for bilateral leading-out, the double-lug structure can only be adopted generally, if the double-lug structure is realized, multiple lugs need to be arranged to be respectively welded with cover plates on two sides, an upper cover plate and a lower cover plate are needed, and the ultrasonic welding mode is complex.

Therefore, a pin and cap assembly and a battery are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

One objective of the present invention is to provide a pin, which can effectively prevent a short circuit of a core package and has good safety performance.

As the conception, the technical scheme adopted by the utility model is as follows:

a pin, comprising:

the lead comprises a lead body, a lead body and a lead frame, wherein the lead body is of a bent structure and comprises a first fixing part and a second fixing part which are fixedly connected, the first fixing part is configured to be capable of being connected with a battery top cover, and the second fixing part is configured to be capable of fixing two winding cores;

the utmost point post screening glass, utmost point post screening glass connect in the second fixed part, and with leave the clearance between the first fixed part.

Optionally, the second fixing portion includes a connecting member and a side plate, the side plate is disposed opposite to the connecting member on two sides, and the side plate can be used for fixing the winding core.

Optionally, the connecting member is a connecting plate or a connecting rod.

The utility model also aims to provide a top cover assembly, which can realize the bilateral extraction of the full pole lug with a double-winding-core structure and effectively improve the power supply power of the battery.

A top cover assembly comprises a battery top cover and two pins, wherein the battery top cover comprises a pole, a lower plastic part, a cover plate, an upper plastic part and a riveting block, the pole comprises a positive pole and a negative pole, the upper plastic part comprises a positive upper plastic part and a negative upper plastic part, the riveting block comprises a positive riveting block and a negative riveting block, and the pins comprise a positive pin and a negative pin;

the positive pole column sequentially penetrates through the positive pole pin, the lower plastic part, the cover plate and the positive pole upper plastic part from bottom to top and is riveted to the positive pole riveting block;

the negative pole post penetrates through the negative pole pin, the lower plastic part, the cover plate and the plastic part on the negative pole in sequence from bottom to top, and the plastic part is riveted on the negative pole to the negative pole riveting block.

Optionally, the upper plastic part is configured to separate the cover plate and the riveting block, the positive upper plastic part is a conductive part, and the negative upper plastic part is an insulating part.

Optionally, the upper plastic part is provided with an installation groove, and the riveting block is arranged in the installation groove.

Optionally, an explosion-proof valve and an explosion-proof valve protection sheet are arranged on the battery top cover in an overlapped mode.

Optionally, a liquid injection hole is further formed in the battery top cover.

Optionally, the battery top cap further comprises a sealing element, and the sealing element is sleeved on the pole.

It is another object of the present invention to provide a battery suitable for high power applications, which has good safety performance and long service life.

The battery comprises two winding cores and the top cover assembly, wherein the two winding cores are respectively fixed on an anode tab of the anode pin, and the two winding cores are respectively fixed on a cathode tab of the cathode pin.

The utility model has the beneficial effects that:

the pin provided by the utility model comprises a pin body and a pole protection sheet. The pin body is the structure of buckling, including fixed connection's first fixed part and second fixed part, and first fixed part can be used for connecting the battery top cap, and the second fixed part can be used for two fixed book cores simultaneously to this realizes that the full utmost point ear of two book cores is drawn forth, can effectively improve the power supply power of battery. In addition, the pole protection sheet is connected to the second fixing portion, and a gap is reserved between the pole protection sheet and the first fixing portion, so that short circuit caused by the fact that the first fixing portion is extruded by the winding core is avoided, and safety of the battery is guaranteed.

The top cover assembly provided by the utility model comprises a battery top cover and the two pins. The battery top cover comprises a pole, a lower plastic part, a cover plate, an upper plastic part and a riveting block. Utmost point post includes anodal utmost point post and negative pole utmost point post, goes up the plastic part and includes plastic part on anodal plastic part and the negative pole, and the riveting piece includes anodal riveting piece and negative pole riveting piece, and the pin includes anodal pin and negative pole pin. Specifically, positive pole from the bottom up in proper order with anodal pin, the one end of plastic part, apron down on the one end, the positive pole of plastic part and positive pole riveting piece riveting together, negative pole from the top up in proper order with the other end of negative pole pin, lower plastic part, apron, on the other end of negative pole, plastic part and negative pole riveting piece riveting together. The double-side lead-out of the double-roll core full lug can be realized, and the power supply power of the battery is effectively improved.

The battery provided by the utility model comprises two winding cores and a top cover assembly, wherein positive pole lugs of the two winding cores are respectively fixed on a positive pole pin, and negative pole lugs of the two winding cores are respectively fixed on a negative pole pin. The design of the double-winding-core full-lug can reduce the ohmic impedance of the core package to the greatest extent, improve the power supply power of the battery and be suitable for high-power scenes.

Drawings

Fig. 1 is a schematic structural diagram of a pin according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a pin body according to an embodiment of the utility model;

fig. 3 is a schematic structural diagram of a top cover assembly according to a second embodiment of the present invention.

In the figure:

100. a pin body; 1001. a first fixed part; 1002. a second fixed part; 10021. a connecting member; 10022. a side plate; 200. an electrode post protection sheet;

1. a positive electrode pin; 2. a negative electrode pin; 3. a positive pole column; 4. a negative electrode post; 5. a plastic part is put; 6. a cover plate; 7. applying a plastic part on the positive electrode; 8. applying a plastic part on the negative electrode; 9. a positive riveting block; 10. a negative riveting block; 11. a seal member; 12. an explosion-proof valve; 13. explosion-proof valve protection plate.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

Example one

In the field of power type lithium ion batteries, the multiplying power performance is good, the energy density is high, the safety performance is high, the key focus direction of battery design is provided, the ohmic resistance value of the battery can be greatly reduced by increasing the cross-sectional area of a winding core lug, and the power characteristic of the lithium ion battery can be effectively improved. In view of this, this embodiment provides a pin, can realize two sides of two book core full utmost point ears and draw forth to improve the charge-discharge multiplying power of electric core. In addition, the reliability and safety of the battery are also a technical difficulty and a key point in the manufacturing process of the high-capacity power battery. The pin that this embodiment provided not only is applicable to the two sides of full utmost point ear and draws, still can effectively avoid the core package short circuit that causes because of the core extrusion pin simultaneously, has good security performance.

As shown in fig. 1 and fig. 2, the pin includes a pin body 100 and a terminal protection sheet 200, wherein the pin body 100 is of a bent structure and is mainly used for being fixedly connected to a core, and includes a first fixing portion 1001 and a second fixing portion 1002 which are fixedly connected to each other, and the terminal protection sheet 200 is connected to the second fixing portion 1002 and leaves a gap with the first fixing portion 1001 to prevent the core from extruding the first fixing portion 1001 to cause short circuit of the core package. Optionally, the pole protection sheet 200 is adhered to the second fixing portion 1002, and is parallel to the first fixing portion 1001, and a gap between the two is 1-2 mm.

Specifically, the first fixing portion 1001 and the second fixing portion 1002 are integrally molded. The first fixing portion 1001 can be used to connect to a battery top cover, and therefore, a through hole is further formed in the first fixing portion 1001, so that the first fixing portion 1001 and the battery top cover can be riveted together by a riveting member included in the battery top cover. The second fixing portion 1002 can be used for connecting a winding core, that is, the second fixing portion 1002 can be welded to a winding core tab. Certainly, in order to realize the connection between the pins and the winding core, the pins need to include two pins, namely, the two pins are the anode pin 1 and the cathode pin 2, that is, the second fixing portion 1002 is provided with two pins, the second fixing portion 1002 of the anode pin 1 is connected to the anode tab of the winding core in a welding manner, and the second fixing portion 1002 of the cathode pin 2 is connected to the cathode tab of the winding core in a welding manner. In addition, the second fixing portion 1002 of the pin provided in this embodiment can be fixedly connected to two winding cores at the same time, that is, the second fixing portion 1002 of the positive electrode pin 1 can be welded to the positive electrode tabs of the two winding cores, and the second fixing portion 1002 of the negative electrode pin 2 is welded to the negative electrode tabs of the two winding cores.

In order to connect the second fixing portion 1002 with two winding cores, in this embodiment, the second fixing portion 1002 is composed of two side plates 10022 and a connecting member 10021, wherein the two side plates 10022 are disposed oppositely at two sides of the connecting member 10021. When the second fixing portion 1002 is connected to the core tab, one core tab is welded to one side plate 10022. Optionally, ultrasonic welding is used between the core tab and the side plate 10022, and two or more welding imprints are provided to prevent powder falling due to excessive vibration energy of ultrasonic welding of a single welding imprint.

In this embodiment, connecting piece 10021 is the connecting plate to make second fixed part 1002 be U type structure, two roll core parallel arrangement in connecting plate width direction's both ends, the width of connecting plate and the thickness looks adaptation of rolling up the core. Of course, in other embodiments, the connecting member 10021 can also be a connecting rod, and two ends of the connecting rod are respectively connected to the two side plates 10022. Alternatively, more than one connecting rod may be provided to secure the stability of the second fixing portion 1002.

Example two

The present embodiment provides a cap assembly, which comprises a battery cap and two aforementioned pins. As shown in fig. 3, the battery top cap includes a terminal post, a lower plastic member 5, a cover plate 6, an upper plastic member, and a rivet block. Utmost point post includes anodal utmost point post 3 and negative pole utmost point post 4, goes up plastic part and includes plastic part 7 on the positive pole and plastic part 8 on the negative pole, and the riveting piece includes anodal riveting piece 9 and negative pole riveting piece 10, and the pin includes anodal pin 1 and negative pole pin 2. Specifically, the positive electrode post 3 rivets the positive electrode pin 1, one end of the lower plastic part 5, one end of the cover plate 6, the positive electrode upper plastic part 7 and the positive electrode riveting block 9 together from bottom to top in sequence, and the negative electrode post 4 rivets the negative electrode pin 2, the other end of the lower plastic part 5, the other end of the cover plate 6, the negative electrode upper plastic part 8 and the negative electrode riveting block 10 together from top to bottom in sequence.

In addition, the battery top cap further includes a sealing member 11, which enhances the sealing effect of the battery top cap. Two sealing elements 11 are arranged, one sealing element 11 is sleeved on the positive pole post 3, and the other sealing element 11 is sleeved on the negative pole post 4.

In this embodiment, the cover plate 6 and the riveting block are separated by the upper plastic part, that is, the positive upper plastic part 7 is sandwiched between the cover plate 6 and the positive riveting block 9, and the negative upper plastic part 8 is sandwiched between the cover plate 6 and the negative riveting block 10. The negative pole plastic part 8 is an insulating part, and the negative pole plastic part 8 is preferably made of insulating PPS material, so that the negative pole riveting block 10 and the cover plate 6 can be kept insulated. The positive pole plastic part 7 is a conductive part, the positive pole plastic part 7 is preferably made of conductive PPS (polyphenylene sulfide), and the positive pole riveting block 9 and the cover plate 6 can keep conductive, so that the connection of the positive pole plastic part 7, the cover plate 6, the positive pole post 3 and the battery aluminum shell is realized, a high potential state can be kept, and the battery aluminum shell is prevented from being corroded.

Optionally, go up and be equipped with the mounting groove on the plastic part, plastic part 7 supports to lean on one side of anodal riveting piece 9 to be equipped with first mounting groove on the positive pole promptly to make anodal riveting piece 9 can block locate in first mounting groove, and plastic part 8 supports to be equipped with the second mounting groove on one side of negative pole riveting piece 10 on the negative pole, so that negative pole riveting piece 10 can block locates in the second mounting groove.

Optionally, an explosion-proof valve 12 and an explosion-proof valve protection plate 13 are arranged on the top cover of the battery to balance the pressure accumulated in the battery during the charging and discharging process, so as to avoid the self-explosion of the battery. Specifically, the explosion-proof valve 12 and the explosion-proof valve protection sheet 13 are sequentially stacked, the explosion-proof valve 12 is connected with one side of the battery top cover to cover an explosion-proof hole formed in the battery top cover, and the explosion-proof valve protection sheet 13 is pressed in the explosion-proof hole.

Optionally, a liquid injection hole is further formed in the top cover of the battery, and is used for injecting electrolyte into the battery.

EXAMPLE III

This embodiment provides a battery, including two book cores and as above the top cap subassembly, the anodal utmost point ear of two book cores is fixed in anodal pin 1 respectively, and the negative pole utmost point ear of two book cores then is fixed in negative pole pin 2 respectively. The roll core of this embodiment rolls up the core for full utmost point ear, can need not consider utmost point ear dislocation when convoluteing, can improve greatly and convolute accent quick-witted efficiency, and the design that the core was rolled up to full utmost point ear can furthest reduce the ohmic impedance of core package simultaneously, improves the power supply of battery, is applicable to the high power scene.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the utility model, which changes and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (10)

1. A pin, comprising:

the lead body (100) is of a bent structure and comprises a first fixing part (1001) and a second fixing part (1002) which are fixedly connected, wherein the first fixing part (1001) is configured to be capable of being connected with a battery top cover, and the second fixing part (1002) is configured to be capable of fixing two winding cores;

utmost point post protecting sheet (200), utmost point post protecting sheet (200) connect in second fixed part (1002), and with leave the clearance between first fixed part (1001).

2. A pin according to claim 1, characterized in that said second fixing portion (1002) comprises a connector (10021) and a side plate (10022), said side plate (10022) being disposed opposite to each other on both sides of said connector (10021), said side plate (10022) being able to be used for fixing said winding core.

3. A pin according to claim 2, characterized in that said connector (10021) is a connecting plate or a connecting rod.

4. A top cap assembly, comprising a battery top cap and two pins according to any one of claims 1 to 3, the battery top cap comprising a post comprising a positive post (3) and a negative post (4), a lower plastic (5), a cover plate (6), an upper plastic and a riveting block, the upper plastic comprising a positive upper plastic (7) and a negative upper plastic (8), the riveting block comprising a positive riveting block (9) and a negative riveting block (10), the pins comprising a positive pin (1) and a negative pin (2);

the positive pole column (3) sequentially penetrates through the positive pin (1), the lower plastic part (5), the cover plate (6) and the positive upper plastic part (7) from bottom to top and is riveted on the positive riveting block (9);

the negative pole post (4) penetrates through the negative pole pin (2) from bottom to top in sequence, the lower plastic part (5), the cover plate (6) and the negative pole upper plastic part (8) are riveted on the negative pole riveting block (10).

5. The top cap assembly according to claim 4, wherein the upper plastic is configured to separate the cover plate (6) and the rivet block, the upper positive plastic (7) being a conductive piece, and the upper negative plastic (8) being an insulating piece.

6. The assembly of claim 4, wherein the upper plastic member has a mounting groove formed therein, and the rivet block is disposed in the mounting groove.

7. The top cap assembly of claim 4, wherein an explosion-proof valve (12) and an explosion-proof valve protection sheet (13) are provided on the battery top cap in an overlapping manner.

8. The lid assembly of claim 4, wherein the battery lid further comprises a pour hole.

9. The cap assembly of claim 4, wherein the battery cap further comprises a sealing member (11), the sealing member (11) being disposed around the terminal post.

10. A battery comprising two winding cores and a top cover assembly according to any one of claims 4 to 9, wherein the positive tabs of the two winding cores are respectively fixed to the positive pins (1), and the negative tabs of the two winding cores are respectively fixed to the negative pins (2).

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