CN219959344U

CN219959344U - Multipolar ear battery structure

Info

Publication number: CN219959344U
Application number: CN202321652979.1U
Authority: CN
Inventors: 蒋水连
Original assignee: Shenzhen Xiongtao Lithium Electricity Co ltd; Shenzhen Center Power Tech Co Ltd
Current assignee: Shenzhen Xiongtao Lithium Electricity Co ltd; Shenzhen Center Power Tech Co Ltd
Priority date: 2023-06-27
Filing date: 2023-06-27
Publication date: 2023-11-03
Anticipated expiration: 2033-06-27

Abstract

The utility model provides a multi-lug battery structure which comprises a cover plate, a battery cell and a shell, wherein the battery cell is arranged in the shell, and the cover plate is arranged on the end face of one end of the shell; the battery cell comprises at least one battery cell unit, a first positive electrode connecting sheet, a second positive electrode connecting sheet and a negative electrode connecting sheet; the first positive electrode connecting sheet is connected with a first positive electrode lug of the battery cell unit; the second positive electrode connecting sheet is connected with a second positive electrode lug of the battery cell unit; the negative electrode connecting sheet is connected with a negative electrode lug of the battery cell unit; the negative electrode lug is arranged between the first positive electrode lug and the second positive electrode lug. The utility model has simple structure and reliable performance, can well balance the current density distribution in the battery, prevent the local overheating in the battery and prevent the accelerated aging of the battery, and is particularly suitable for the structure of a high-capacity battery cell.

Description

Multipolar ear battery structure

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a multi-lug battery structure.

Background

The energy storage device has strong comprehensive frequency modulation capability, quick response, high adjustment speed and high adjustment precision, and can enable the power grid to have stronger flexible adjustment capability and safe and stable level when facing the condition of instantaneous fluctuation of power generation of a new system.

Currently, the top cover of square shell batteries has various structural forms, but basically, current is led out from two ends of the battery through a positive lug and a negative lug, and if the size of the battery is small, it is reasonable to lead out the current in this way. However, with the rise of new energy projects such as energy storage power stations, wind power stations, solar power stations and the like, small-capacity batteries cannot meet production requirements, and large-capacity and long-service-life batteries are required to store energy to meet practical use requirements. When the volume of the battery is large, and the current is led out from two ends of the inside of the winding core, the length of the current collector passing through the current in the battery is long, and the large current can penetrate through the inside of the battery, so that the current collector of the whole battery generates heat, more heat is generated, and the performance of the battery core and the cycle life of the battery core are influenced.

Disclosure of Invention

The embodiment of the utility model provides a multi-lug battery structure, which aims to solve the problems of uneven distribution of current and heat in a battery core, excessive heat generation, local overheating, accelerated battery aging and the like of a large-capacity battery of the traditional battery structure. The utility model has simple structure and reliable performance, can well balance the current density distribution in the battery, prevent the local overheating in the battery and prevent the accelerated aging of the battery.

In order to achieve the above object, an embodiment of the present utility model provides a multi-tab battery structure, including a cover plate, a battery cell and a housing, where the battery cell is disposed in the housing, and the cover plate is disposed on an end face of one end of the housing;

the battery cell comprises at least one battery cell unit, a first positive electrode connecting sheet, a second positive electrode connecting sheet and a negative electrode connecting sheet; the first positive electrode connecting sheet is connected with a first positive electrode lug of the battery cell unit; the second positive electrode connecting sheet is connected with a second positive electrode lug of the battery cell unit; the negative electrode connecting sheet is connected with a negative electrode lug of the battery cell unit; the negative electrode lug is arranged between the first positive electrode lug and the second positive electrode lug.

As a preferred embodiment, the first positive electrode connecting piece is connected to one end of the cover plate, and the second positive electrode connecting piece is connected to the other end of the cover plate.

As a preferred embodiment, the cover plate includes a top cover sheet, a lower plastic sheet, a positive electrode post assembly, and a negative electrode post assembly; the top cover sheet is arranged on the lower plastic sheet and is abutted with the lower plastic sheet; the top cover plate is provided with a positive pole hole and a negative pole hole, the positive pole component is arranged in the positive pole hole, and the positive pole component is connected with the top cover plate; the negative pole post subassembly set up in the negative pole post hole, the negative pole post subassembly with the negative pole connection piece is connected.

As a preferred embodiment, one end of the lower plastic sheet is provided with a first hole, and the other end is provided with a second hole; the first positive electrode connecting sheet passes through the first hole and is connected with the top cover sheet; the second positive electrode connecting piece passes through the second hole and is connected with the top cover piece.

As a preferred embodiment, the positive electrode post assembly includes a positive electrode post and a plastic on the positive electrode, the positive electrode post is disposed in the positive electrode post hole, and the positive electrode post is abutted with the top cover sheet; the plastic sleeve on the positive electrode is arranged on the periphery of the positive electrode post, and the plastic on the positive electrode is abutted with the top cover sheet.

As a preferred embodiment, the negative electrode column assembly comprises a negative electrode column, a plastic on the negative electrode, an upper supporting ring and a sealing ring; the sealing ring is arranged in the negative pole column hole, and the negative pole column is arranged on the sealing ring; the upper support ring is sleeved at the bottom end of the negative pole column, and is respectively abutted with the negative pole column and the top cover sheet; the plastic sleeve on the negative electrode is arranged on the periphery of the negative electrode column.

As a preferred implementation mode, the periphery circumference that the lower plastic piece was kept away from to the negative pole post hole is provided with the negative pole boss, the negative pole post set up in the negative pole boss, the plastic set up in on the negative pole the periphery of negative pole boss, just the plastic on the negative pole respectively with the negative pole post go up the support ring the top cap piece, the sealing washer looks butt.

In a preferred embodiment, the plastic on the negative electrode is arranged on the periphery of the negative electrode boss in an injection molding mode.

As a preferred embodiment, the negative electrode post is a post stamped from a copper-aluminum composite material. In the utility model, the pole column parts are all formed by stamping, the processing technology is simple, the preparation efficiency is high, the material cost is low, and the utility model has obvious cost advantages.

As a preferred embodiment, the outer surface of the housing is provided with an insulation shield. Because the top cover plate is connected with the positive pole, the shell body abutted with the top cover plate is positively charged, and therefore, the insulation protection layer is arranged on the outer surface of the shell body, and an effective insulation protection effect can be achieved.

As a preferred embodiment, the multipolar ear cell is a prismatic cell; the battery cell unit is a lithium ion battery cell unit or a sodium ion battery cell unit.

According to the utility model, the negative electrode of the battery cell is arranged in the center of the battery cell, and the positive electrode is led out from two sides of the battery cell, so that the flowing distance of current in the current collector can be effectively reduced, the trend of the current in the current collector is dispersed, the internal resistance of the battery is reduced, and the purpose of reducing the heating value is achieved, thereby improving the energy utilization efficiency of the battery and prolonging the service life of the battery. The battery cell unit adopts a plurality of lugs, so that the current intensity in the current collector can be effectively reduced, the energy is saved, and the utilization efficiency of charge and discharge is improved. The utility model has simple structure and reliable performance, can well balance the current density distribution in the battery, prevent the local overheating in the battery and prevent the accelerated aging of the battery, and is particularly suitable for the structure of a high-capacity battery cell.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the overall structure of a multi-tab battery structure according to an embodiment of the present utility model;

FIG. 2 is an exploded structural schematic view of the multi-lug battery structure of FIG. 1;

FIG. 3 is a schematic view of the internal structure of the multi-tab battery structure of FIG. 1;

FIG. 4 is a schematic diagram of the cell unit of the multi-tab battery structure of FIG. 1;

fig. 5 is a schematic cross-sectional view of the top cover of the multi-tab cell structure of fig. 1 along the long side.

Detailed Description

The following description of the technical solutions in the embodiments of the present utility model will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, back, top, bottom … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indications are correspondingly changed.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

In the battery structure of the embodiment of the utility model, the number of the battery cells can be set according to actual use requirements, and can be set to one, two, three, four or even more. When the battery cell units are provided with a plurality of battery cell units, the battery cell units share one first positive electrode connecting sheet, one second positive electrode connecting sheet and one negative electrode connecting sheet.

Specifically, in the present embodiment, a battery structure provided with two battery cells is taken as an example to describe the battery structure in detail.

As shown in fig. 1 to 4, an embodiment of the present utility model provides a multi-tab battery structure, which includes a cover plate 10, a battery cell 20 and a housing 30, wherein the battery cell 20 is disposed in the housing 30, and the cover plate 10 is disposed on an end surface of one end of the housing 30;

the battery cell 20 comprises two battery cell units 21 (the two battery cell units 21 are symmetrically arranged), a first positive electrode connecting sheet 22, a second positive electrode connecting sheet 23 and a negative electrode connecting sheet 24; the first positive electrode connecting piece 21 is connected with the first positive electrode lugs 211 of the two battery cell units 21; the second positive electrode connecting piece 23 is connected with the second positive electrode lugs 212 of the two battery cell units 21; the negative electrode connecting piece 24 is connected with the negative electrode lugs 213 of the two battery cell units 21; the negative electrode tab 213 is disposed between the first positive electrode tab 211 and the second positive electrode tab 212.

In the present embodiment, the two battery cells 21 are symmetrically disposed on both sides of the first positive electrode tab 22 (the second positive electrode tab 23 or the negative electrode tab 24).

As a preferred embodiment, the first positive electrode connection piece 22 is connected to one end of the cover plate 10, and the second positive electrode connection piece 23 is connected to the other end of the cover plate 10.

In the embodiment of the utility model, the cathode lug 213 is arranged between the first cathode lug 211 and the second cathode lug 212, so that the cathode of the battery cell unit 21 is led out from two sides, the flowing distance of current in the current collector can be effectively reduced, the trend of the current in the current collector is dispersed, the internal resistance of the battery is reduced, and the heat productivity is reduced, thereby improving the energy use efficiency of the battery and prolonging the service life of the battery.

As a preferred embodiment, referring to fig. 2 and 5, the cover plate 10 includes a top cover plate 11, a lower plastic plate 12, a positive electrode post assembly 13 and a negative electrode post assembly 14; the top cover sheet 11 is arranged on the lower plastic sheet 12, and the top cover sheet 11 is abutted with the lower plastic sheet 12; the top cover sheet 11 is provided with a positive pole hole 111 and a negative pole hole 112, the positive pole component 13 is arranged in the positive pole hole 111, and the positive pole component 13 is connected with the top cover sheet 11; the negative electrode post assembly 14 is disposed in the negative electrode post hole 112, and the negative electrode post assembly 14 is connected to the negative electrode connecting piece 24.

As a preferred embodiment, the lower plastic sheet 12 is provided with a first hole 121 at one end and a second hole 122 at the other end; the first positive electrode connecting piece 22 is connected with the top cover piece 11 through the first hole 121; the second positive electrode connection piece 23 is connected to the top cover piece 11 through the second hole 122.

As a preferred embodiment, the positive electrode post assembly 13 includes a positive electrode post 131 and a plastic on the positive electrode 132, the positive electrode post 131 is disposed in the positive electrode post hole 111, and the positive electrode post 131 abuts against the top cover sheet 11; the plastic 132 on the positive electrode is sleeved on the periphery of the positive electrode post 131, and the plastic 132 on the positive electrode is abutted to the top cover sheet 11.

Thus, the positive pole 131 is directly welded on the top cover sheet 11, and the plastic 132 on the positive pole is coated and injection-molded on the outer side of the positive pole 131, so as to play a role in insulation protection. By connecting the first positive electrode connecting piece 22 and the second positive electrode connecting piece 23 with the top cover piece 11, the top cover piece 11 plays a role of a conductor, and current led out by the first positive electrode connecting piece 22 and the second positive electrode connecting piece 23 is collected to the positive electrode column 131 and led out by the positive electrode column 131.

As a preferred embodiment, the negative electrode post assembly 14 includes a negative electrode post 141, a negative electrode upper plastic 142, an upper support ring 143, and a sealing ring 144; the sealing ring 144 is disposed in the negative electrode column hole 112, and the negative electrode column 141 is disposed on the sealing ring 144; the upper supporting ring 143 is sleeved at the bottom end of the negative pole column 141, and the upper supporting ring 143 is respectively abutted against the negative pole column 141 and the top cover sheet 11; the plastic 142 is sleeved on the periphery of the negative pole column 141.

As a preferred embodiment, the negative electrode post hole 112 is circumferentially provided with a negative electrode boss 1121 away from the outer periphery of the lower plastic sheet 12, the negative electrode post 141 is disposed in the negative electrode boss 1121, the negative electrode upper plastic 142 is disposed on the outer periphery of the negative electrode boss 1121, and the negative electrode upper plastic 142 is respectively abutted against the negative electrode post 141, the upper support ring 143, the top cover sheet 11 and the sealing ring 144.

In a preferred embodiment, the plastic 142 on the negative electrode is disposed on the outer periphery of the negative electrode boss 1121 by injection molding.

By providing the negative electrode boss 1121, the function of fixing the negative electrode column 141 can be achieved, and the upper support ring 143 and the negative electrode boss 1121 are generally connected by laser welding. The negative electrode plastic 142 is typically a thermoplastic, and may be PPS, PE, PP, ABS, nylon, LCP, PVC, or the like.

In a preferred embodiment, the negative electrode post 141 is a post punched from a copper-aluminum composite material. In the utility model, the pole column parts are all formed by stamping, the processing technology is simple, the preparation efficiency is high, the material cost is low, and the utility model has obvious cost advantages.

In this embodiment, the top cover sheet 11 is further provided with an explosion-proof valve hole 113; an explosion-proof valve assembly 15 is disposed adjacent the negative electrode column assembly 14 and a liquid injection hole 16 is disposed adjacent the positive electrode column assembly 13. The explosion-proof valve assembly 15 includes an explosion-proof valve protection patch 151 and an explosion-proof valve 152, the explosion-proof valve 152 is disposed in the explosion-proof valve hole 113, and the explosion-proof valve protection patch 151 is disposed on a side surface of the explosion-proof valve 152 away from the lower plastic sheet 12.

As a preferred embodiment, the outer surface of the housing 30 is provided with an insulation protection layer (not shown). Because the top cover plate is connected with the positive pole, the shell body abutted with the top cover plate is positively charged, and therefore, the insulation protection layer is arranged on the outer surface of the shell body, and an effective insulation protection effect can be achieved. The insulating protective layer can be arranged according to actual use, and can be PP or an insulating electrolyte corrosion resistant material such as PPS. The shell 30 can be formed by laser welding after an aluminum plate is folded; the molding can also be realized by adopting a high-frequency welding mode after folding; or extrusion molding can be adopted; or may be stretch-formed.

It will be appreciated that in other embodiments, if the cell does need to be made longer, the number of positive and negative posts may be increased for the purpose of balancing the current in the current collector.

As a preferred embodiment, the multipolar ear cell is a prismatic cell; the battery cell unit 21 is a lithium ion battery cell unit or a sodium ion battery cell unit.

In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. The multi-lug battery structure is characterized by comprising a cover plate, a battery cell and a shell, wherein the battery cell is arranged in the shell, and the cover plate is arranged on the end face of one end of the shell;

2. The multi-tab battery structure of claim 1 wherein the first positive connection tab is connected to one end of the cover plate and the second positive connection tab is connected to the other end of the cover plate.

3. The multi-tab battery structure of claim 2 wherein the cover plate comprises a top cover plate, a lower plastic sheet, a positive electrode post assembly and a negative electrode post assembly; the top cover sheet is arranged on the lower plastic sheet and is abutted with the lower plastic sheet; the top cover plate is provided with a positive pole hole and a negative pole hole, the positive pole component is arranged in the positive pole hole, and the positive pole component is connected with the top cover plate; the negative pole post subassembly set up in the negative pole post hole, the negative pole post subassembly with the negative pole connection piece is connected.

4. The multi-tab battery structure of claim 3 wherein the lower plastic sheet is provided with a first aperture at one end and a second aperture at the other end; the first positive electrode connecting sheet passes through the first hole and is connected with the top cover sheet; the second positive electrode connecting piece passes through the second hole and is connected with the top cover piece.

5. The multi-tab battery structure of claim 4, wherein the positive electrode post assembly comprises a positive electrode post and a positive electrode top plastic, the positive electrode post being disposed within the positive electrode post hole, the positive electrode post being in abutment with the top cap piece; the plastic sleeve on the positive electrode is arranged on the periphery of the positive electrode post, and the plastic on the positive electrode is abutted with the top cover sheet.

6. The multi-polar ear cell structure of claim 5, wherein the negative electrode post assembly comprises a negative electrode post, a negative electrode upper plastic, an upper support ring, and a sealing ring; the sealing ring is arranged in the negative pole column hole, and the negative pole column is arranged on the sealing ring; the upper support ring is sleeved at the bottom end of the negative pole column, and is respectively abutted with the negative pole column and the top cover sheet; the plastic sleeve on the negative electrode is arranged on the periphery of the negative electrode column.

7. The multi-polar ear cell structure of claim 6, wherein the outer circumference of the negative pole post hole away from the lower plastic piece is provided with a negative pole boss, the negative pole post is arranged in the negative pole boss, the negative pole upper plastic is arranged at the outer circumference of the negative pole boss, and the negative pole upper plastic is respectively abutted with the negative pole post, the upper support ring, the top cover plate and the sealing ring.

8. The multi-polar ear cell structure of claim 7, wherein the negative electrode upper plastic is disposed on the outer periphery of the negative electrode boss by injection molding;

the negative pole post is a pole post obtained by punching a copper-aluminum composite material.

9. The multi-tab battery structure of claim 1, wherein the outer surface of the housing is provided with an insulating protective layer.

10. The multi-tab battery structure of claim 1 wherein the multi-tab battery is a prismatic battery; the battery cell unit is a lithium ion battery cell unit or a sodium ion battery cell unit.