CN220341465U

CN220341465U - Battery structure

Info

Publication number: CN220341465U
Application number: CN202321085363.0U
Authority: CN
Inventors: 任明秀; 徐志国; 李洋; 王健; 朱冠楠; 王成
Original assignee: Shanghai Xuanyi New Energy Development Co ltd
Current assignee: Shanghai Xuanyi New Energy Development Co ltd
Priority date: 2023-05-08
Filing date: 2023-05-08
Publication date: 2024-01-12
Anticipated expiration: 2033-05-08

Abstract

The utility model discloses a battery structure, comprising: the positive electrode plate and the negative electrode plate are alternately stacked, and the positive electrode plate and the negative electrode plate are characterized in that the stacked core is provided with one long side and one short side which are adjacent; further comprises: the first electrode lug is arranged on the long side, and the second electrode lug is arranged on the short side; the first tab is one of a positive tab of the positive plate and a negative tab of the negative plate, and the second tab is the other one of the positive tab of the positive plate and the negative tab of the negative plate. According to the utility model, the positive electrode tab and the negative electrode tab are distributed in two directions, and through spatial distribution, the overcurrent area of the tabs is prolonged, and the heat generation and ohmic internal resistance of the tabs are reduced. The utility model is provided with the cold water pipe, and the cold water pipe is arranged between the electrode lug and the battery body, so that the electrode lug can be cooled in a directional manner.

Description

Battery structure

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery structure.

Background

Along with the improvement of the energy and the volume energy density of the single-layer positive electrode plate and the single-layer negative electrode plate in the single-layer battery, the current passing through the single-layer positive electrode plate and the single-layer negative electrode plate in the single-layer battery is greatly increased. As shown in fig. 1, the conventional soft pack battery has the positive and negative tabs respectively disposed on two sides of the short length of the battery body, and the overcurrent capacity of the tab region cannot be greatly improved while the capacity is increased. Therefore, the insufficient overcurrent capacity at the single-layer current collector and the tab may cause continuous increase in battery polarization, internal resistance and heat increase, which may be more serious under high-rate conditions. In the use process of the composite battery, the thickness of the plating layer of the composite foil is about 3-6 times of that of a normal current collector, so that heat generation of a tab welding area is more serious.

Disclosure of Invention

In view of the above, an object of the present utility model is to provide a battery structure.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a battery structure, comprising: the laminated core comprises a plurality of positive plates and negative plates which are alternately stacked, and a diaphragm is arranged between each positive plate and each negative plate, wherein the laminated core is provided with a long side and a short side which are adjacent; further comprises:

a first tab and a second tab, the first tab being arranged on the long side and the second tab being arranged on the short side;

the first tab is one of a positive tab of the positive plate and a negative tab of the negative plate, and the second tab is the other one of the positive tab of the positive plate and the negative tab of the negative plate.

The above battery structure, wherein the length of the long side is greater than twice the length of the short side.

The above battery structure, wherein, still include: and the packaging film at least comprises a stacked core accommodating area for accommodating the stacked core and a tab accommodating area for accommodating the first tab.

The battery structure comprises two stacked core accommodating areas, wherein the two stacked core accommodating areas are respectively used for accommodating two sides of the stacked core, and the two stacked core accommodating areas are connected or not connected with each other;

the battery structure further comprises two lug accommodating areas, wherein the two lug accommodating areas are respectively arranged on two adjacent sides of the same core accommodating area.

In the battery structure, the packaging film wraps the stacked core to form a first part of the packaging structure, and meanwhile, the packaging film wraps the first tab to form a second part of the packaging structure;

the first part of the packaging structure is connected with the second part of the packaging structure;

the second part of the packaging structure is bent and attached to the surface of the first part of the packaging structure.

The battery structure is characterized in that a water cooling pipe is arranged between the first part of the packaging structure and the second part of the packaging structure.

In the above battery structure, the first tab is a positive tab, and the second tab is a negative tab;

the positive electrode connecting sheet is connected with the positive electrode lug, and the negative electrode connecting sheet is connected with the negative electrode lug.

The battery structure described above, wherein the positive electrode connecting piece is arranged along the long side and is led out from the long side, and the negative electrode connecting piece is arranged along the short side and is led out in a direction parallel to the long side.

In the above battery structure, the first tab protrudes from a long side of the stacked core.

In the above battery structure, the depths of the two stacked core accommodating areas are different, the depth of the deeper stacked core accommodating area is 4mm-9mm, and the depth of the shallower stacked core accommodating area is 0.1mm-2mm; the depth of the tab accommodating area is 0.1mm-2mm.

The utility model adopts the technology, so that compared with the prior art, the utility model has the positive effects that:

(1) According to the utility model, the positive electrode tab and the negative electrode tab are distributed in two directions, and through spatial distribution, the overcurrent area of the tabs is prolonged, and the heat generation and ohmic internal resistance of the tabs are reduced.

(2) The utility model is provided with the cold water pipe, and the cold water pipe is arranged between the electrode lug and the battery body, so that the electrode lug can be cooled in a directional manner.

(3) The utility model distributes the positive electrode tab and the negative electrode tab in two adjacent directions, avoids the simultaneous arrangement of the tabs on two long side sides, has higher strength and is not easy to damage in the transferring process

Drawings

Fig. 1 is a schematic diagram of the prior art of the present utility model.

Fig. 2 is a schematic view of a stacked core of the cell structure of the present utility model.

Fig. 3 is an exploded schematic view of a stacked core of the battery structure of the present utility model.

Fig. 4 is a schematic view of a stacked core of the cell structure of the present utility model.

Fig. 5 is a schematic view of the development of the aluminum plastic film of the present utility model.

Fig. 6 is a schematic view of an aluminum plastic film package of the present utility model.

Fig. 7 is a schematic view of a cold water pipe of the present utility model.

In the accompanying drawings: 1. stacking the cores; 2. a positive plate; 3. a negative electrode sheet; 4. a diaphragm; 5. a long side; 6. short side; 7. a first tab; 8. a second lug; 9. packaging films; 10. a core stack receiving area; 11. a tab receiving area; 12. a first portion of the package structure; 13. a second portion of the package structure; 14. a cold water pipe; 15. a positive electrode connecting sheet; 16. a negative electrode connecting sheet; 17. welding and printing; 18. positive electrode tab glue; 19. negative electrode tab glue; 20. a positive electrode tab pit; 21. a negative electrode tab pit; 22. positive electrode connecting piece pits; 23. and sealing the area.

Detailed Description

The utility model is further described below with reference to the drawings and specific examples, which are not intended to be limiting.

Example 1

Fig. 2 is a schematic view of a stacked core of the cell structure of the present utility model; fig. 3 is an exploded schematic view of a stacked core of the cell structure of the present utility model; fig. 4 is a schematic view of a stacked core of the cell structure of the present utility model; FIG. 5 is a schematic view of the development of an aluminum plastic film of the present utility model; FIG. 6 is a schematic diagram of an aluminum plastic film package of the present utility model; fig. 7 is a schematic view of a cold water pipe of the present utility model, referring to fig. 2 to 7, showing a battery structure of a preferred embodiment, comprising: the laminated core 1, the laminated core 1 comprises a plurality of alternately stacked positive electrode plates 2 and negative electrode plates 3, a diaphragm 4 is arranged between each positive electrode plate 2 and each negative electrode plate 3, and the laminated core 1 is provided with a long side 5 and a short side 6 which are adjacent; further comprises: a first tab 7 and a second tab 8, the first tab 7 being arranged on the long side 5 and the second tab 8 being arranged on the short side 6; the first tab 7 is one of the positive tab 2 and the negative tab of the negative tab 3, and the second tab 8 is the other of the positive tab 2 and the negative tab of the negative tab 3.

Fig. 2 to 3 show schematic diagrams of positive electrode plates 2 and negative electrode plates 3 stacked alternately, wherein a separator 4 is disposed between each positive electrode plate 2 and the adjacent negative electrode plate 3, and fig. 2 shows a plurality of groups of structures shown in fig. 3 stacked.

In a preferred embodiment, the separator 4 is used to isolate the positive and negative electrode sheets 2, 3 and to prevent electrons in the stack 1 from freely passing through, allowing ions in the electrolyte to pass freely between the positive and negative electrodes.

In a preferred embodiment, the positive electrode tab and the negative electrode tab are arranged in two directions, and further, the extending direction of the positive electrode tab and the extending direction of the negative electrode tab are perpendicular, so that the over-current area of the tabs can be prolonged through spatial distribution, and the over-current heat generation and ohmic internal resistance of the tabs are reduced. The electrode lugs on the side surface of the longer side of the battery improve the overcurrent area of the current collector, and the cooling system is arranged in the area when the follow-up modules are arranged due to the difference between the thickness of the electrode lugs and the thickness of the stacked core 1, so that the temperature rise of the battery core can be further effectively and directionally reduced.

In a preferred embodiment, the length of the long side 5 is greater than twice the length of the short side 6.

In a preferred embodiment, further comprising: the packaging film 9, the packaging film 9 includes at least a core stack accommodating region 10 for accommodating the core stack and a tab accommodating region 11 for accommodating the first tab 7.

Further, the encapsulation film 9 is an aluminum plastic film.

In a preferred embodiment, the encapsulation film 9 comprises two core receiving areas 10, the two core receiving areas 10 being intended to receive two sides of the core 1, respectively, the two core receiving areas 10 being connected or disconnected to each other.

Further, as shown in fig. 5, two core receiving areas 10 are snapped to enclose the core 1.

In a preferred embodiment, the packaging film 9 further comprises two tab receiving areas 11, the two tab receiving areas 11 being arranged on adjacent sides of the same core receiving area 10, respectively.

Further, the two tab accommodation areas 11 are a positive tab pit 20 and a negative tab pit 21, respectively, for accommodating the positive tab and the negative tab, respectively.

In a preferred embodiment, the packaging film 9 wraps around the stacked core 1 to form a packaging structure first portion 12, while the packaging film 9 wraps around the first tab to form a packaging structure second portion 13;

further, the package structure first portion 12 and the package structure second portion 13 are connected;

further, the second portion 13 of the package structure is bent and attached to the surface of the first portion 12 of the package structure.

In a preferred embodiment, the second portion 13 of the packaging structure is bent and attached to the surface of the first portion 12 of the packaging structure, that is, the packaged first tab 7 is attached to the side surface of the packaged laminated core 1, so as to reduce the space occupied by the first tab 7.

In a preferred embodiment, a water cooling tube 14 is provided between the first part 12 of the encapsulation structure and the second part 13 of the encapsulation structure.

The foregoing is merely a preferred embodiment of the present utility model, and is not intended to limit the embodiments and the protection scope of the present utility model.

The present utility model has the following embodiments based on the above description:

in a further embodiment of the present utility model, the first tab 7 is a positive tab, and the second tab 8 is a negative tab.

Further, the positive electrode connection piece 15 is connected to the positive electrode tab, and the negative electrode connection piece 16 is connected to the negative electrode tab.

In a preferred embodiment, the positive tab is provided with a weld 17.

In a preferred embodiment, the positive plate 2 is made of a composite foil, and the weld 17 is obtained by roll welding.

In a further embodiment of the utility model, the positive connection piece 15 is arranged along the long side 5 and leads out from the long side 5, and the negative connection piece 16 is arranged along the short side 6 and leads out in a direction parallel to the long side 5.

In a preferred embodiment, as shown in fig. 4, on the long side 5 where the positive tab is located, the positive tab 15 extends in the direction of the long side 5, the negative tab is located on the short side 6, and the negative tab 16 is located in the direction of the short side 6 and leads out in a direction parallel to the long side 5.

Further, as shown in fig. 6, the negative electrode tab 16 protrudes outside the packaging film 9, and the positive electrode tab 15 also extends outside the packaging film 9 on the same side as the negative electrode tab 16.

Further, the positive electrode tab pit 20 and the negative electrode tab pit 21 on the encapsulation film 9 correspond to the positions of the positive electrode tab and the negative electrode tab, respectively, and the negative electrode tab pit 21 extends from the core stack accommodating region 10 to the outside of the encapsulation film 9; the encapsulating film 9 further includes: positive electrode tab well 22, positive electrode tab well 22 extends from positive electrode tab well 20 to the outside of encapsulation film 9 on the same side as negative electrode tab well 21 for receiving positive electrode tab 15.

In a further embodiment of the utility model, the first tab 7 protrudes from the long side 5 of the core stack 1.

In a further embodiment of the utility model, the two core receiving areas 10 are different in depth, the deeper one of the core receiving areas 10 is 4mm-9mm in depth, and the shallower one of the core receiving areas 10 is 0.1mm-2mm in depth; the tab receiving area 11 has a depth of 0.1mm to 2mm.

In a preferred embodiment, the encapsulation film 9 forms a sealing ring around the stack 1, the first tab 7 and a portion of the second tab 8, the encapsulation film 9 forming a sealing region 23 within the sealing ring.

As shown in fig. 6, at least a portion of the positive connection tab 15 and at least a portion of the negative connection tab 16 protrude beyond the seal area 23.

In a further embodiment of the present utility model, the positive electrode tab glue 18 is disposed on the positive electrode connecting piece 15, and the positive electrode tab glue 18 is disposed at the sealing area 23 of the positive electrode connecting piece 15 extending out of the packaging film 9; the negative electrode tab glue 19 is arranged on the negative electrode connecting sheet 16, and the negative electrode tab glue 19 is arranged at the seal area 23 of the negative electrode connecting sheet 16 extending out of the packaging film 9.

In a preferred embodiment, the positive and negative electrode tab adhesives 18, 19 act as a seal such that the seal is a sealed space even though at least a portion of the positive and negative electrode tabs 15, 16 extend beyond the seal area 23.

Example 2

Preferably, as a preferred embodiment, in embodiment 2, on the basis of embodiment 1, the positive electrode sheet 2 is made of a composite foil, the welding mark 17 and the positive electrode tab (i.e., the first tab 7) are obtained by roll welding, and the positive electrode connecting sheet 15 is welded with the positive electrode tab by laser welding. The negative electrode tab 16 is welded to the negative electrode tab (i.e., the second tab 8) by ultrasonic welding. The laminated core 1 is obtained in a lamination mode, and the positive electrode tab and the negative electrode tab are arranged on two adjacent side surfaces of the laminated core 1. The positive electrode tab paste 18 was encapsulated with the encapsulation film 9 at the positive electrode tab well 20, and the negative electrode tab paste 19 was encapsulated with the encapsulation film 9 at the negative electrode tab well 21, to obtain the battery of example 2.

Comparative example 1

In this comparative example 1, the positive electrode tab 2 was a composite foil, the weld 17 and the positive electrode tab were obtained by roll welding, and the positive electrode connecting tab 15 was welded to the positive electrode tab by laser welding. The negative electrode tab 16 is welded to the negative electrode tab by ultrasonic welding. The laminated core 1 is obtained by lamination, and the positive electrode tab and the negative electrode tab are arranged on two opposite side surfaces of the laminated core 1. The positive electrode tab paste 18 was sealed with the sealing film 9 at the positive electrode tab hole 20, and the negative electrode tab paste 19 was sealed with the sealing film 9 at the negative electrode tab hole 21, to obtain the battery of comparative example 1.

The batteries of example 2 and comparative example 1 were subjected to resistance and electrical property tests, and the results were as follows:

it can be seen that, using the same time, the ac internal resistance of the present application is lower than that of the battery in fig. 1; the temperature rise at the tab of the present application is lower than that of the battery in fig. 1.

Therefore, the structure of the battery lug area overcurrent capacity can be increased, the heat generation of the battery core can be directionally reduced, and the volume energy density of the module can be improved.

The foregoing is merely illustrative of the preferred embodiments of the present utility model and is not intended to limit the embodiments and scope of the present utility model, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present utility model, and are intended to be included in the scope of the present utility model.

Claims

1. A battery structure comprising a stacked core, wherein the stacked core comprises a plurality of positive plates and negative plates which are alternately stacked, and a diaphragm is arranged between each positive plate and each negative plate; further comprises:

2. The battery structure of claim 1, wherein the length of the long side is greater than twice the length of the short side.

3. The battery structure as in claim 1, further comprising: and the packaging film at least comprises a stacked core accommodating area for accommodating the stacked core and a tab accommodating area for accommodating the first tab.

4. A battery structure according to claim 3, comprising two said core-receiving regions for receiving both sides of said core, respectively, said core-receiving regions being connected or disconnected to each other;

the electrode lug containing areas are respectively arranged on two adjacent sides of the same stacked core containing area.

5. The battery structure of claim 3, wherein the encapsulation film encapsulates the stack to form a first portion of an encapsulation structure and the encapsulation film encapsulates the first tab to form a second portion of an encapsulation structure;

6. The battery structure of claim 5, wherein a water-cooled tube is disposed between the first portion of the enclosure and the second portion of the enclosure.

7. The battery structure of claim 1, wherein the first tab is a positive tab and the second tab is a negative tab;

8. The battery structure according to claim 7, wherein the positive electrode tab is arranged along and drawn from the long side, and the negative electrode tab is arranged along and drawn from the short side in a direction parallel to the long side.

9. The battery structure of claim 1, wherein the first tab protrudes from a long side of the stack.

10. A battery structure according to claim 3, wherein the two core-receiving regions are different in depth, the deeper one of the core-receiving regions being 4mm to 9mm in depth, and the shallower one of the core-receiving regions being 0.1mm to 2mm in depth; the depth of the tab accommodating area is 0.1mm-2mm.