CN220021529U - Bare cell structure and battery pack - Google Patents

Abstract

The utility model provides a bare cell structure and a battery pack, and relates to the technical field of batteries, wherein the bare cell structure comprises a bare cell body, a plurality of lugs are arranged on the bare cell body, and a notch is arranged on each lug; when the bare cell body is connected with the other bare cell body, a plurality of lugs on the bare cell body are in one-to-one correspondence with a plurality of lugs on the other bare cell body, the notch on each lug is combined with the notch on the other corresponding lug to form a connecting port, and the current collecting plate is partially exposed out of the connecting port and is welded with the current collecting plate and the pole through the connecting port to form a first welding point. Through setting up the breach, form the connector, be convenient for utmost point post and collector plate welding have overcome utmost point ear widening and the outstanding degree reduction and lead to the defect that the welding space is not enough for when two bare cell body are connected, the welding between utmost point post and the collector plate has sufficient welding space, and then has guaranteed that the group battery of combination becomes can have compacter overall structure.

Description

Bare cell structure and battery pack

Technical Field

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

Background

The bare cell in the prior art comprises a positive electrode tab and a negative electrode tab, and as shown in fig. 1, the connection between the two bare cells is realized through a current collecting plate and a top cover. The positive electrode tab of the bare cell is connected with the positive electrode tab of the other bare cell through a positive electrode current collecting plate, the negative electrode tab of the bare cell is connected with the negative electrode tab of the other bare cell through a negative electrode current collecting plate, and the positive electrode post and the negative electrode post of the top cover are respectively connected with the positive electrode current collecting plate and the negative electrode current collecting plate in a laser welding mode so as to realize connection between the two bare cells.

However, in the bare cell structure in the prior art, when the bare cell structure is connected, due to the fact that the size of the top cover adopted is larger, and the distance between corresponding lugs on two bare cells is larger, the structure is not compact enough, and the overall size of the assembled battery is larger.

Therefore, a new bare cell structure is provided, which has wider tabs with smaller protruding degree, when two bare cells are connected with each other to form a battery pack, the distance between the corresponding tabs on the two bare cells is closer, and then a top cover with more compact size can be adopted, so that the whole structure of the formed battery pack is more compact. However, when the bare cell structure is assembled into a battery pack, the electrode posts on the top cover have a small welding space when being welded with the current collecting plate due to the fact that the width dimension of the electrode lugs is larger and the distance between the corresponding electrode lugs is closer, and further improvement is needed.

Disclosure of Invention

In view of this, this description embodiment provides a naked electric core structure and group battery, through the improvement to the structure for two naked electric cores can reserve sufficient space for the welding of utmost point post and current collector between corresponding utmost point ear when connecting, improves the problem that utmost point post and current collector welding space are not enough.

The embodiment of the specification provides the following technical scheme:

the embodiment of the specification provides a bare cell structure, which comprises a bare cell body, wherein a plurality of lugs are arranged on the bare cell body, and each lug is provided with a notch;

when the bare cell body and the other bare cell body are connected through the current collecting plate and the top cover, a plurality of lugs on the bare cell body and a plurality of lugs on the other bare cell body are in one-to-one correspondence, gaps on each lug are combined with gaps on the other corresponding lug to form a connecting port, the current collecting plate is partially exposed out of the connecting port, the current collecting plate and the pole post are welded through the connecting port to form a first welding point, and the connecting port and the pole post are correspondingly arranged in the direction perpendicular to the top cover.

Through the technical scheme, the notch is formed in the lug, and then when two bare cell bodies are connected, the notch between the corresponding two lugs can be combined to form the connecting port for the pole to pass through, so that the pole and the current collecting plate are convenient to weld and fix, the defect that the welding space is insufficient due to the fact that the pole is widened and the protruding degree is reduced is overcome, the welding between the pole and the current collecting plate has sufficient welding space when the two bare cell bodies are connected, and further the battery pack formed by combining can have a more compact integral structure.

Preferably, the regions of the tabs corresponding to the two sides of the notch are respectively used for welding with the current collecting plate;

when the two bare cell bodies are connected, the corresponding lugs are in a mutually approaching, abutting or overlapping state, and the current collecting plate is welded with the regions, corresponding to the two sides of the notch, on the lugs to form a second welding point.

Through the technical scheme, when the two bare cell bodies are connected and combined, the second welding spots formed by welding the electrode lugs and the current collecting plate are respectively positioned at two sides of the notch, so that at least part of the area of the first welding spot is surrounded by the second welding spots, the current path between the two bare cell bodies is shortened, and the resistance of the battery pack formed by the two bare cell bodies is smaller.

Preferably, the bare cell body is provided with two lugs, namely a positive pole lug and a negative pole lug;

the notch on the positive electrode tab is a positive electrode notch, and the notch on the negative electrode tab is a negative electrode notch.

Preferably, the notch is arranged at one end of the electrode lug far away from the bare cell body and is positioned at the center of the electrode lug.

Preferably, the distance from the bottom of the notch to the bottom of the tab is 1:4-4:1.

Preferably, the distance from the bottom of the notch to the bottom of the tab is 1:1.

Preferably, the width of the notch/the width of the tab is 1:4-1:2.

Preferably, the width of the notch/the width of the tab is 1:3.

Preferably, the distance from the bottom of the notch to the bottom of the tab is 5-30mm.

Preferably, the width of the notch is 5-50mm.

Preferably, the width of the tab is 40-200mm.

According to the technical scheme, the position of the first welding spot is not influenced by the size of the lug any more, so that the welding area, the overcurrent area and the heat dissipation area can be increased by increasing the width of the lug;

the current collecting plates are respectively provided with 4 notches in the length direction and the width direction, so that the weight reduction is carried out as much as possible on the premise of not affecting the overcurrent capacity of the current collecting plates. The embodiment of the specification also provides a battery pack, which comprises a top cover, a current collecting plate and any bare cell structure.

Preferably, the plurality of lugs on the bare cell body are in one-to-one corresponding butt joint with the plurality of lugs on the other bare cell body;

four second welding spots are formed between the current collecting plate and the two corresponding lugs through welding, two second welding spots are distributed on each lug, and the two second welding spots are symmetrically distributed on two sides of the flat plate end of the lug corresponding to the notch.

Preferably, the plurality of tabs on the bare cell body are in one-to-one correspondence with the plurality of tabs on the other bare cell body, and the opposite end of each tab and the other corresponding tab has at least a partial overlapping area;

two second welding spots are formed between the current collecting plate and the two corresponding lugs through welding, and the two second welding spots are symmetrically distributed on two sides of the overlapping area corresponding to the notch.

Compared with the prior art, the beneficial effects that above-mentioned at least one technical scheme that this description embodiment adopted can reach include at least:

through setting up the breach on the utmost point ear, and then when two bare cell bodies are connected, the breach between corresponding two utmost point ears can be made up and form the connector that supplies the utmost point post to pass through, be convenient for utmost point post and collector plate welded fastening, overcome utmost point ear widening and the defect that the protruding degree reduces and lead to the welding space not enough, make two bare cell bodies when connecting, can adopt the tab that the width is bigger to get better current collecting ability, also realized that welding between utmost point post and the collector plate has sufficient welding space, and then guaranteed that the group battery of group's that makes up can have more compact overall structure, make the bare cell structure that adopts long and narrow square battery top cap to connect more nimble in the design, the performance is more superior;

another technical effect of the design of the current collecting plate notch and the design of the tab notch is that the light weight of the whole battery cell can be realized on the premise of possibly guaranteeing current collecting.

Drawings

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

FIG. 1 is a schematic diagram of a bare cell in the prior art;

fig. 2 is a schematic diagram of a bare cell structure according to a first embodiment of the present utility model;

fig. 3 is another schematic view of a bare cell structure according to the first embodiment of the utility model;

fig. 4 is a schematic view of a battery pack according to a first embodiment of the present utility model;

fig. 5 is an exploded view showing the overall structure of a battery pack according to a first embodiment of the present utility model;

fig. 6 is a schematic view showing a partial structure of a battery pack according to a first embodiment of the present utility model;

FIG. 7 is an enlarged schematic view of a partial structure at A in FIG. 6;

fig. 8 is a schematic view showing the overall structure of a battery pack according to the first embodiment of the present utility model;

fig. 9 is another partial schematic structure of a battery pack according to the first embodiment of the present utility model;

FIG. 10 is an enlarged schematic view of a partial structure at B in FIG. 9;

fig. 11 is a schematic diagram of a bare cell structure according to a second embodiment of the present utility model;

fig. 12 is a schematic view showing a partial structure of a battery pack according to a second embodiment of the present utility model;

FIG. 13 is an enlarged schematic view of a partial structure at C in FIG. 12;

fig. 14 is a schematic view showing another partial structure of a battery pack according to a second embodiment of the present utility model;

FIG. 15 is an enlarged schematic view of the partial structure at D in FIG. 14;

fig. 16 is a schematic view showing the overall structure of a battery pack according to a second embodiment of the present utility model;

fig. 17 is an exploded view showing the overall structure of a battery pack according to a second embodiment of the present utility model.

Reference numerals: 1. a tab; 101. a positive electrode tab; 102. a negative electrode tab; 2. a notch; 201. a positive electrode notch; 202. a negative electrode notch; 3. a first welding spot; 4. a second welding spot; 5. a current collecting plate; 501. a positive electrode current collecting plate; 502. a negative electrode current collecting plate; 6. a top cover; 7. a pole; 701. a positive electrode post; 702. a negative electrode post; 8. a connection port; 9. a bare cell body.

Detailed Description

Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. 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 is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, apparatus may be implemented and/or methods practiced using any number and aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.

It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the present utility model may be practiced without these specific details.

In the prior art, when the bare cell structure is connected, the adopted top cover is larger in size, and the relative distance between corresponding lugs on two bare cells is larger, so that the structure is not compact enough, and the overall size of the assembled battery is larger.

Therefore, a new bare cell structure is provided, which has wider tabs with smaller protruding degree, when two bare cells are connected with each other to form a battery pack, the distance between the corresponding tabs on the two bare cells is closer, and then a top cover with more compact size can be adopted, so that the whole structure of the formed battery pack is more compact. However, when the bare cell structure is assembled into a battery pack, the electrode posts on the top cover have a small welding space when being welded with the current collecting plate due to the fact that the width dimension of the electrode lugs is larger and the distance between the corresponding electrode lugs is closer, and further improvement is needed.

In view of the above, the inventor carries out structural improvement through the bare cell, so that when two bare cells are connected, enough space can be reserved for welding of the pole and the current collecting plate between corresponding pole lugs, and the problem of insufficient welding space of the pole and the current collecting plate is solved.

The following describes the technical scheme provided by each embodiment of the present utility model with reference to the accompanying drawings.

Example 1

As shown in fig. 2 to 3, the embodiment of the present disclosure provides a bare cell structure including a bare cell body 9.

One end of the bare cell body 9 is provided with a plurality of tabs 1, and each tab 1 is provided with a notch 2.

More specifically, the number of the tabs 1 on the bare cell body 9 is two, namely a positive tab 101 and a negative tab 102. The notch 2 on the positive electrode tab 101 is a positive electrode notch 201, and the notch 2 on the negative electrode tab 102 is a negative electrode notch 202.

Further, the notch 2 is disposed at one end of the tab 1 far away from the bare cell body 9, and is located at the center of the tab 1.

In other embodiments, the notch 2 may be disposed in other areas of the end of the tab 1 away from the bare cell body 9, and may be disposed off-center.

Specifically, the distance from the bottom of the notch 2 to the bottom of the tab 1/the width of the notch 2 is 1:4-4:1.

Preferably, the distance from the bottom of the notch 2 to the bottom of the tab 1/the width of the notch 2 is 1:1.

Specifically, the width of the notch 2/the width of the tab 1 is 1:4-1:2.

Preferably, the width of the notch 2/the width of the tab 1 is 1:3.

The distance from the bottom of the notch 2 to the bottom of the tab 1 is 5-30mm, the width of the notch 2 is 5-50mm, and the width of the tab 1 is 40-200mm.

As shown in fig. 4 to 8, when actually two bare cell bodies 9 are connected to form a battery pack, the connection between the two bare cell bodies 9 is achieved through the current collecting plate 5 and the top cover 6. Wherein, a plurality of tabs 1 on one bare cell body 9 and a plurality of tabs 1 on the other bare cell body 9 are arranged in one-to-one correspondence, and the notch 2 on each tab 1 is combined with the notch 2 on the other corresponding tab 1 to form a connecting port 8. The connection port 8 and the pole 7 are correspondingly arranged in the direction perpendicular to the top cover 6, the current collecting plate 5 is partially exposed out of the connection port 8, and the current collecting plate 5 and the pole 7 are welded and fixed through the connection port 8 so as to form a first welding point 3.

In the practical application process, because the notch 2 is arranged on the tab 1, when the two bare cell bodies 9 are connected, the electrode post 7 and the current collecting plate 5 can be welded and fixed through the connecting port 8, the defect that the welding space is insufficient due to the widening of the tab 1 and the reduction of the distance between the corresponding tabs 1 is overcome, and the sufficient space is formed in the welding between the electrode post 7 and the current collecting plate 5 when the two bare cell bodies 9 are connected, so that the assembled battery can have a more compact integral structure. Furthermore, the welding space between the pole 7 and the current collecting plate 5 is influenced by the width of the pole lug 1 and the distance between the corresponding pole lugs 1, so that the width of the pole lug 1 can be freely adjusted according to actual requirements, the wider size can ensure that the pole lug 1 provides stronger current collecting capability when being welded with the current collecting plate 5, and the welding area, the heat radiating area and the overcurrent area are more sufficient.

Further, when the two bare cell bodies 9 are connected to form a battery pack, the corresponding tabs 1 on the two bare cell bodies 9 are in a state of approaching, abutting or overlapping each other, and the current collecting plate 5 is welded with the regions corresponding to the two sides of the notch 2 on the tab 1 to form the second welding spot 4. Therefore, at least part of the area of the first welding spot 3 is wrapped by the second welding spot 4, the distance between the first welding spot 3 and the second welding spot 4 is shorter, the formed current path is shorter, and when the two bare cell bodies 9 are combined to form the battery pack, the current path of the battery pack is shorter and the resistance is smaller.

The embodiment of the present disclosure further provides a battery pack, as shown in fig. 4 to 10, including a top cover 6, a current collecting plate 5, and two bare cell structures as described in any one of the above.

The electrode lugs 1 on the bare cell body 9 are in one-to-one corresponding abutting state with the electrode lugs 1 on the other bare cell body 9.

In other embodiments, the plurality of tabs 1 on the bare cell body 9 are in one-to-one correspondence with the plurality of tabs 1 on the other bare cell body 9, and opposite ends of each tab 1 and the corresponding tab 1 are in a state of being close to each other.

More specifically, the part of the tab 1 close to the bare cell body 9 is a flat plate end, and the part of the tab 1 far away from the bare cell body 9 is an inclined surface end. When the two bare cell bodies 9 are connected with each other, the inclined plane ends of the two corresponding tabs 1 are in a mutually abutting state. Wherein the notch 2 is located at the center of the bevel end and the flat end.

Further, there are two current collecting plates 5, namely, a positive current collecting plate 501 and a negative current collecting plate 502. The top cover 6 is also provided with two poles 7, namely a positive pole 701 and a negative pole 702. The positive electrode post 701 and the positive electrode current collecting plate 501 are welded and fixed through a connecting port 8 formed by two positive electrode gaps 201, and a first welding spot 3 is formed. The negative electrode post 702 and the negative electrode current collecting plate 502 are welded and fixed through a connecting port 8 formed by two negative electrode gaps 202, and a first welding spot 3 is formed.

Four second welding spots 4 are formed between the positive electrode current collecting plate 501 and the two positive electrode lugs 101 in a conformal manner through welding, two second welding spots 4 are distributed on each positive electrode lug 101, and the two second welding spots 4 on the positive electrode lugs 101 are respectively located at positions of the flat plate ends corresponding to two sides of the notch 2.

Four second welding spots 4 are formed between the negative electrode current collecting plate 502 and the two negative electrode lugs 102 in a conformal manner through welding, two second welding spots 4 are distributed on each negative electrode lug 102, and the two second welding spots 4 on the negative electrode lugs 102 are respectively located at positions of the flat plate ends corresponding to two sides of the notch 2.

The current collecting plate 5 in fig. 9 is provided with 4 notches in the length and width directions, respectively, in order to reduce the weight as much as possible without affecting the current passing capability of the current collecting plate 5.

According to the battery pack provided by the embodiment of the specification, the gaps 2 are formed in the pole lugs 1 in a combined mode to form the connecting ports 8, so that the pole posts 7 and the current collecting plates 5 are in sufficient space welding, the first welding spots 3 formed by welding are surrounded by the pole lugs 1 and the second welding spots 4 formed by welding the current collecting plates 5, on one hand, the problem of insufficient welding space is solved, on the other hand, the distance between the first welding spots 3 and the second welding spots 4 is smaller, and when a current path is formed, the current path is shorter, and the resistance of the battery pack is ensured to be smaller. Furthermore, the structure can lead the battery pack with the long and narrow square battery top cover to be more flexible in design and better in performance.

Example two

The difference from the first embodiment is that, as shown in fig. 11 to 17, the plurality of tabs 1 on the bare cell body 9 are in one-to-one correspondence with the plurality of tabs 1 on the other bare cell body 9, and each tab 1 has at least a partial overlapping area with the opposite end of the other corresponding tab 1.

More specifically, there is a partial overlap region between the opposite ends of the two positive electrode tabs 101, and there is a partial overlap region between the opposite ends of the two negative electrode tabs 102. The connection port 8 formed by the two positive electrode notches 201 is located on the overlapping area of the two positive electrode tabs 101, and the connection port 8 formed by the two negative electrode notches 202 is located on the overlapping area of the two negative electrode tabs 102.

The positive electrode current collecting plate 501 is welded with the two positive electrode lugs 101, two second welding spots 4 are formed in a conformal manner, the two second welding spots 4 are located on the overlapping area of the two positive electrode lugs 101, the two second welding spots 4 are symmetrically distributed about the connection ports 8 formed by the two positive electrode gaps 201, and the distribution direction of the two second welding spots 4 is perpendicular to the distribution direction of the two positive electrode lugs 101.

The cathode current collecting plate 502 is welded with the two cathode tabs 102, two second welding spots 4 are formed in a conformal manner, the two second welding spots 4 are located on the overlapping area of the two cathode tabs 102, the two second welding spots 4 are symmetrically distributed about the connection ports 8 formed by the two cathode gaps 202, and the distribution direction of the two second welding spots 4 is perpendicular to the distribution direction of the two cathode tabs 102.

The current collecting plate 5 in fig. 15 is provided with 4 notches in the length and width directions, respectively, in order to reduce the weight as much as possible without affecting the current passing capability of the current collecting plate 5.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment focuses on differences from other embodiments.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (14)

1. The bare cell structure is characterized by comprising a bare cell body, wherein a plurality of lugs are arranged on the bare cell body, and each lug is provided with a notch;

when the bare cell body and the other bare cell body are connected through the current collecting plate and the top cover, a plurality of lugs on the bare cell body and a plurality of lugs on the other bare cell body are in one-to-one correspondence, gaps on each lug are combined with gaps on the other corresponding lug to form a connecting port, the current collecting plate is partially exposed out of the connecting port, the current collecting plate and the pole post are welded through the connecting port to form a first welding point, and the connecting port and the pole post are correspondingly arranged in the direction perpendicular to the top cover.

2. The bare cell structure according to claim 1, wherein the regions of the tabs corresponding to both sides of the notch are respectively used for welding with a current collecting plate;

when the two bare cell bodies are connected, the corresponding lugs are in a mutually approaching, abutting or overlapping state, and the current collecting plate is welded with the regions, corresponding to the two sides of the notch, on the lugs to form a second welding point.

3. The bare cell structure according to claim 1, wherein the bare cell body has two tabs, namely a positive tab and a negative tab;

the notch on the positive electrode tab is a positive electrode notch, and the notch on the negative electrode tab is a negative electrode notch.

4. The bare cell structure according to claim 1, wherein the notch is disposed at an end of the tab away from the bare cell body and is located at a central position of the tab.

5. The bare cell structure according to claim 1, wherein the distance from the bottom of the notch to the bottom of the tab/width of the notch is 1:4-4:1.

6. The bare cell structure according to claim 5, wherein the gap bottom to tab bottom distance/gap width is 1:1.

7. The bare cell structure of claim 1 wherein the width of the gap/width of the tab is 1:4 to 1:2.

8. The bare cell structure of claim 7 wherein the width of the gap/width of the tab is 1:3.

9. The bare cell structure according to claim 5 or 6, wherein the distance from the bottom of the notch to the bottom of the tab is 5-30mm.

10. The bare cell structure according to claim 6 or 8, wherein the notch has a width of 5-50mm.

11. The bare cell structure according to claim 7 or 8, wherein the width of the tab is 40-200mm.

12. A battery comprising a top cover, a current collector and two bare cell structures according to any one of claims 1-7.

13. The battery pack according to claim 12, wherein a plurality of tabs on the bare cell body are in one-to-one corresponding abutment with a plurality of tabs on another bare cell body;

four second welding spots are formed between the current collecting plate and the two corresponding lugs through welding, two second welding spots are distributed on each lug, and the two second welding spots are symmetrically distributed on two sides of the flat plate end of the lug corresponding to the notch.

14. The battery pack of claim 13, wherein a plurality of tabs on the bare cell body are in one-to-one correspondence with a plurality of tabs on another bare cell body, and opposite ends of each tab and another corresponding tab have at least partial overlapping areas;

two second welding spots are formed between the current collecting plate and the two corresponding lugs through welding, and the two second welding spots are symmetrically distributed on two sides of the overlapping area corresponding to the notch.