CN219350394U - Single battery and power battery pack - Google Patents

Abstract

The utility model provides a single battery and a power battery pack, wherein the single battery comprises a pole column, a connecting sheet, a pole lug and a heat conduction structure; the connecting piece comprises a pole connecting part, a protecting part and a pole lug connecting part, wherein the protecting part is positioned between the pole connecting part and the pole lug connecting part, the pole connecting part is welded with the pole, and the pole lug connecting part is welded with the pole lug; the heat conduction structure is coated on the outer side of the protection part so as to conduct out heat of the protection part. In the process of high-current transmission, the heat conducting structure can conduct out the heat of the protection part and radiate the heat into the external environment, so that the temperature of the protection part is effectively reduced, the temperature rise of the connecting sheet is reduced, the normal transmission of current is ensured, the swelling phenomenon is avoided, and the safety of the single battery in the charging and discharging process is improved.

Description

Single battery and power battery pack

Technical Field

The utility model relates to the technical field of heat dissipation of single batteries, in particular to a single battery and a power battery pack.

Background

The ion battery comprises a battery core and a shell wrapped outside the battery core, wherein the battery core is a main body part of the ion battery, and the battery core is electrically connected with a pole on the shell through a connecting sheet, so that the charge and discharge functions of the ion battery are realized.

When the ion battery works, current flows through the connecting sheet, the temperature of the connecting sheet gradually rises along with the increase of the working time, and particularly when the current is overlarge due to the occurrence of adverse conditions such as short circuit and the like, the temperature of the connecting sheet rapidly rises, the phenomenon of short circuit is easily caused by the overlarge temperature of the connecting sheet, and the explosion of the battery is easily caused, so that serious potential safety hazards are caused.

However, in the current ion battery on the market, air cooling and the like are generally utilized to cool the battery core, so that the cooling of the connecting sheet part is often ignored, and the safety of the battery in the working process cannot be effectively ensured.

Disclosure of Invention

In view of this, the utility model provides a single battery and a power battery pack, which at least solves the problem that the temperature of a connecting sheet is high and safety accidents are easy to cause in the working process of the existing single battery.

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

the utility model provides a single battery, which comprises a pole, a connecting sheet, a pole lug and a heat conduction structure, wherein the pole lug is connected with the connecting sheet;

the connecting piece comprises a pole connecting part, a protecting part and a pole lug connecting part, wherein the protecting part is positioned between the pole connecting part and the pole lug connecting part, the pole connecting part is welded with the pole, and the pole lug connecting part is welded with the pole lug;

the heat conduction structure is coated on the outer side of the protection part so as to conduct out heat of the protection part.

Optionally, the thermally conductive structure comprises a thermally conductive housing;

the heat conduction shell is internally provided with a hollow cavity, and the protection part is embedded in the hollow cavity.

Optionally, the heat conducting structure further comprises a heat conducting medium;

the heat conducting medium is coated outside the heat conducting shell or filled inside the heat conducting shell.

Optionally, an accommodating structure is arranged outside the heat conducting shell, and the heat conducting medium is arranged in the accommodating structure.

Optionally, the accommodating structure is a hollow boss, and the heat conducting medium is filled in the hollow boss.

Optionally, the accommodating structure is a groove, and the heat conducting medium is filled in the groove.

Optionally, the surface of the heat conducting shell is provided with an opening so that the hollow cavity is communicated with the outside.

Optionally, the surface of the heat conducting shell is provided with radiating fins, and the radiating fins are distributed in an array.

Optionally, a fuse protection structure is provided in a central region of the protection portion.

The utility model also provides a power battery pack, which comprises the single battery of any one of the above.

Compared with the prior art, the single battery and the power battery pack have the following advantages:

the single battery comprises the pole, the connecting sheet, the pole lug and the heat conducting structure, wherein the connecting sheet comprises the pole lug connecting part, the protecting part and the pole lug connecting part, the protecting part is positioned between the pole lug connecting part and the pole lug connecting part, the pole lug connecting part is welded with the pole lug, and the pole lug connecting part is welded with the pole lug, so that the current transmission between the pole lug and the pole lug can be realized through the connecting sheet, and the charging and discharging functions of the single battery are realized. The heat conduction structure is coated on the outer side of the protection part, so that heat of the protection part can be led out and emitted to the external environment, the temperature of the protection part is effectively reduced, the temperature rise of the connecting sheet is reduced, normal current transmission is ensured, the swelling phenomenon is avoided, and the safety of the single battery charging and discharging process is improved.

The power battery pack of the present utility model has the same or similar advantages as those of the aforementioned single batteries in the prior art, and is not described herein.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic view showing an appearance of a single battery connecting piece in the embodiment;

fig. 2 is a schematic cross-sectional view of a single cell connecting piece in the embodiment;

fig. 3 is a schematic view showing an appearance of a heat conductive housing in the present embodiment;

fig. 4 is a schematic cross-sectional view of a heat conductive housing in the present embodiment;

fig. 5 is a schematic view showing an external appearance of a boss provided on the outside of the heat conductive housing in the present embodiment;

FIG. 6 is a schematic cross-sectional view of a boss provided on the outside of a heat conductive housing in the present embodiment;

fig. 7 is a schematic view showing an external appearance of a heat conductive housing with a groove;

FIG. 8 is a schematic cross-sectional view of a heat conductive housing with grooves on the outside of the housing;

fig. 9 is an external view schematically showing a split heat conductive housing in the present embodiment;

fig. 10 is a schematic cross-sectional view of a split heat conductive housing in this embodiment;

fig. 11 is a schematic diagram of a heat-conducting shell with a heat-dissipating fin structure in the present embodiment;

fig. 12 is a schematic cross-sectional view of a heat-conducting shell with a heat-dissipating fin structure in the present embodiment;

fig. 13 is a schematic view of a connecting piece in this embodiment.

Reference numerals illustrate:

the heat-conducting device comprises a 1-connecting sheet, a 2-heat-conducting shell, a 3-heat-conducting medium, a 10-protecting part, a 101-fusing protecting structure, a 11-pole connecting part, a 12-pole lug connecting part, a 21-hollow cavity, a 22-boss, a 221-accommodating cavity, a 23-groove, a 24-opening and a 25-radiating fin.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. 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.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present utility model may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

It should be appreciated that reference throughout this specification to "one embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present utility model. Thus, the appearances of the phrase "in one embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The following describes a single battery and a power battery pack provided by the utility model in detail by listing specific examples.

Referring to fig. 1, an embodiment of the present utility model provides a single battery, including a pole, a connecting piece 1, a pole ear and a heat conducting structure; the connecting piece 1 comprises a pole connecting part 11, a protecting part 10 and a pole lug connecting part 12, wherein the protecting part 10 is positioned between the pole connecting part 11 and the pole lug connecting part 12, the pole connecting part 11 is welded with the pole, and the pole lug connecting part 12 is welded with the pole lug; the heat conducting structure is wrapped on the outer side of the protection part 10 to conduct out the heat of the protection part 10.

Specifically, the battery cell includes utmost point post, connection piece 1, utmost point ear and heat conduction structure, and the utmost point post is the battery cell and carries out the contact point of charge-discharge in-process, including anodal post and negative pole post, and the utmost point ear carries out the passageway of electric current transmission for battery cell in-process with the utmost point post, also includes anodal ear and negative pole ear, and connection piece 1 is a conducting strip in essence, has better electrically conductive function, and connection piece 1 includes utmost point post connecting portion 11, protection portion 10 and utmost point ear connecting portion 12, and protection portion 10 is located between utmost point post connecting portion 11 and the utmost point ear connecting portion 12. The pole connection part 11 is used for welding with the pole, and the pole lug connection part 12 is used for welding with the pole lug, and it should be noted that in the welding process, the positive pole corresponds to the positive pole lug, and the negative pole corresponds to the negative pole lug. In the discharging process of the single battery, the current in the battery core flows to the connecting sheet 1 through the lug, then flows to the pole through the connecting sheet 1, and the pole is electrically connected with external equipment, so that the external equipment is charged; in the single battery charging process, external equipment is electrically connected with the pole, and current of the external equipment flows to the connecting sheet 1 through the pole, then flows to the lug through the connecting sheet 1, and charges the battery cell through the lug. In addition, in practical application, the battery cell still includes rigid casing, like aluminum alloy, steel alloy casing etc. has in the casing and holds the chamber, and the electric core is located and is held the intracavity, and the casing can effectively avoid steam, fog, dust etc. to get into and hold the intracavity to play better guard action to holding the electric core in the chamber.

As shown in fig. 1, the connection piece 1 is provided with a protection part 10, and the protection part 10 is dedicated for transmitting large current of the single battery in the charge and discharge process, so as to ensure the reliability of current transmission and avoid the overcurrent phenomenon of the connection piece 1. However, since the current is repeatedly transferred through the connecting piece 1, the temperature of the connecting piece 1 is easily increased, especially, the temperature of the protecting part 10 for large current transfer is increased more quickly, the temperature of the connecting piece 1 is increased more, the normal transfer of the current is affected by the excessively high temperature, the conditions such as short circuit and the like are caused, the bulge phenomenon of the welding part of the connecting piece 1 is possibly caused, and even the explosion of a single battery is caused, so that serious potential safety hazards are caused. In order to avoid the occurrence of the above phenomenon, in this embodiment, the outside of the protection portion 10 is coated with a heat conducting structure, and the heat conducting structure can conduct out the heat of the protection portion 10 and emit the heat to the external environment, so as to effectively reduce the temperature of the protection portion 10, and after the temperature of the protection portion 10 is reduced, the temperature rise of the connecting piece 1 is correspondingly reduced, so that the normal transmission of the current can be ensured, the swelling phenomenon at the welding position is avoided, and the safety of the charging and discharging process of the single battery is improved.

The single battery comprises a pole, a connecting sheet 1, a pole lug and a heat conducting structure, wherein the connecting sheet 1 comprises a pole lug connecting part 11, a protecting part 10 and a pole lug connecting part 12, the protecting part 10 is positioned between the pole lug connecting part 11 and the pole lug connecting part 12, the pole lug connecting part 11 is welded with the pole lug, and the pole lug connecting part 12 is welded with the pole lug, so that the current transmission between the pole lug and the pole lug can be realized through the connecting sheet 1, namely the charge and discharge functions of the single battery are realized. The heat conduction structure is coated on the outer side of the protection part 10, so that heat of the protection part 10 can be led out and emitted to the external environment, thereby effectively reducing the temperature of the protection part 10, reducing the temperature rise of the connecting sheet 1, ensuring normal current transmission, avoiding the occurrence of swelling phenomenon and improving the safety of the single battery in the charging and discharging process.

Optionally, referring to fig. 2 to 4, the thermally conductive structure comprises a thermally conductive housing 2; the heat conduction shell 2 is internally provided with a hollow cavity 21, and the protection part 10 is embedded in the hollow cavity 21.

Specifically, the heat conduction structure comprises a heat conduction shell 2, wherein the heat conduction shell 2 has certain strength, is not easy to deform and has certain load impact resistance. Meanwhile, the heat conducting shell 2 is processed by insulating materials, such as a plastic shell, a silica gel shell and the like, so as to avoid short circuit between the heat conducting shell 2 and the connecting sheet 1. As shown in fig. 4, the heat conducting shell 2 is provided with a hollow cavity 21 inside, the protecting part 10 of the connecting sheet 1 is embedded in the hollow cavity 21, and the size of the hollow cavity 21 is set according to the size of the protecting part 10, so that the heat conducting shell 2 stably fixes the protecting part 10 in the hollow cavity 21, thereby the heat conducting structure plays a role in heat conduction and heat dissipation on the protecting part 10, and meanwhile, the stability of the connecting sheet 1 can be enhanced, the reliability of current transmission between the tab and the pole is improved, and the reliability of the charging and discharging process of the single battery is further improved.

Optionally, referring to fig. 4, the heat conducting structure further comprises a heat conducting medium 3; the heat conducting medium 3 is coated outside the heat conducting shell 2 or filled inside the heat conducting shell 2.

Specifically, as shown in fig. 4, on the basis of the heat conducting shell 2, the heat conducting structure further includes a heat conducting medium 3, and the heat conducting medium 3 has a better heat conducting property, and may be formed by processing any one or more heat conducting materials such as heat conducting paraffin, heat conducting graphite, heat conducting gel, heat conducting silicone grease, polyethylene glycol, etc., and the specific material composition of the heat conducting medium 3 is not limited in this embodiment. The heat conducting medium 3 is wrapped outside the heat conducting shell 2 or filled inside the heat conducting shell 2, so as to further strengthen the heat conducting effect and improve the heat radiating efficiency of the heat conducting structure to the connecting sheet 1.

Optionally, a containing structure is provided on the outside of the heat conducting housing 2, and the heat conducting medium 3 is provided in the containing structure.

Specifically, in combination with the foregoing embodiment, the connection piece 1 is provided with the protection portion 10, the protection portion 10 is dedicated to carrying out the transmission of heavy current, in the battery cell charge-discharge process, the protection portion 10 is higher than other positions of connection piece 1, based on this, set up the accommodation structure in the outside of heat conduction casing 2, heat conduction medium 3 is all filled in the accommodation structure, thereby strengthen the heat conduction effect of heat conduction structure to the protection portion 10, reduce the temperature rise of protection portion 10 fast, after the temperature rise of protection portion 10 descends, the temperature rise of connection piece 1 reduces thereupon, thereby can guarantee the normal transmission of electric current, promote the security of battery cell charge-discharge process. Meanwhile, the heat conducting medium 3 is arranged in the accommodating structure, so that the stability of the heat conducting medium 3 can be maintained, and the phenomenon that the heat conducting medium 3 flows and overflows after being heated and melted is avoided, and the heat conducting effect is influenced.

Alternatively, referring to fig. 5 and 6, the receiving structure is a hollow boss 22, and the heat conducting medium 3 is filled in the hollow boss 22.

Specifically, as shown in fig. 5 and 6, the accommodating structure is a hollow boss 22, and the hollow boss 22 may be disposed on one side of the heat conducting housing 2, or may be disposed on two opposite sides of the heat conducting housing 2, so that the structure of the form disposed on one side is simple, the processing is convenient, the material cost can be saved to a certain extent, the heat conducting effect of the form disposed on two sides is better, and the heat dissipation and cooling of the protection part 10 are more facilitated. In the specific embodiment, the person skilled in the art can determine the heat dissipation requirement of the protection part 10 and the processing cost, and the present embodiment is not limited. As shown in fig. 6, schematic diagrams of the hollow bosses 22 disposed on opposite sides of the heat conductive housing 2 are shown, and as shown in fig. 6, the heat conductive medium 3 is filled in the hollow bosses 22 and covers the surface of the hollow cavity 21 of the heat conductive housing 2, so that efficient heat conduction can be performed on the protection portion 10 in the hollow cavity 21, and the temperature rise of the connecting sheet 1 can be effectively reduced.

Alternatively, referring to fig. 7 and 8, the receiving structure is a groove 23, and the heat conductive medium 3 is filled in the groove 23.

Specifically, as shown in fig. 7 and 8, the accommodating structure is a groove 23, and the groove 23 may be disposed along a single side of the heat conducting housing 2, or may be disposed on two sides of the heat conducting housing 2, and similarly, the advantages of being disposed on a single side and on two sides are similar to those of the hollow boss 22 described above, and will not be repeated herein. In the specific embodiment, the person skilled in the art can determine the heat dissipation requirement of the protection part 10 and the processing cost, and the present embodiment is not limited. As shown in fig. 8, the grooves 23 are shown on two opposite sides of the heat conducting shell 2, and as shown in fig. 8, the heat conducting medium 3 is filled in the grooves 23 and covers the surface of the hollow cavity 21 of the heat conducting shell 2, so that the protection part 10 in the hollow cavity 21 can conduct heat efficiently, and the temperature rise of the connecting sheet 1 can be effectively reduced.

In combination with the foregoing embodiment, the hollow boss 22 has a good tightness, and is good in dimensional stability for the heat conducting medium 3, and there is no risk of overflowing the heat conducting medium 3, but its processing difficulty and processing cost are correspondingly high. The structure of the groove 23 is simpler, the processing difficulty and the processing cost are lower, but the dimensional stability of the heat conducting medium 3 is poorer, and the heat conducting medium 3 still has the risk of overflowing. As to what form the housing structure is specifically arranged in, a person skilled in the art may select the dimensional stability of the heat conducting medium and the processing cost in a comprehensive manner, and this embodiment is not limited.

Alternatively, referring to fig. 9 and 10, the surface of the heat conductive housing 2 is provided with an opening 24 to allow the hollow cavity 21 to communicate with the outside.

Specifically, as shown in fig. 9 and 10, the surface of the heat conducting housing 2 is provided with an opening 24, the hollow cavity 21 can be communicated with the outside by the opening 24, the protection part 10 is embedded in the hollow cavity 21, and after the hollow cavity 21 is communicated with the outside, heat generated by the protection part 10 can be emitted from the opening 24, so that heat dissipation and temperature reduction of the protection part 10 are realized.

Alternatively, referring to fig. 10 and 11, the surface of the heat conductive housing 2 is provided with heat dissipation fins 25, and the heat dissipation fins 25 are distributed in an array.

Specifically, as shown in fig. 10 and 11, the surface of the heat conducting shell 2 is provided with heat dissipating fins 25, the heat dissipating fins 25 are distributed in an array, the number of the heat dissipating fins 25, the height of the heat dissipating fins 25, and the distance between two adjacent heat dissipating fins 25 affect the heat conducting efficiency of the heat conducting shell 2, and the heat conducting efficiency of the heat conducting shell 2 is higher when the number of the heat dissipating fins 25 is higher and the distance is higher, however, the space occupied by the heat dissipating fins 25 is larger when the height of the heat dissipating fins 25 is higher, and meanwhile, the number of the heat dissipating fins 25 and the distance are inversely related when the area of the heat conducting shell 2 is constant.

Alternatively, referring to fig. 13, a center region of the protection part 10 is provided with a fuse protection structure 101.

Specifically, as shown in fig. 13, the fuse protection structure 101 is provided in the central region of the protection unit 10, and when the current passing through the protection unit 10 is excessive, the fuse protection structure 101 can cut off the current by itself, thereby providing overload protection. In a specific embodiment, the fuse protection structure 101 may be a fuse, and the design difficulty is low and the processing cost is low.

The embodiment of the utility model also provides a power battery pack which comprises the single battery.

Specifically, the power battery pack is provided with the single battery, and the single battery can realize better heat dissipation in the charging and discharging process, so that the power battery pack can be ensured to continuously and reliably work in the process of supplying power to the electric automobile or in the process of charging the power battery pack from a power station, the risk of short circuit or explosion caused by overhigh temperature in the power battery pack is avoided, and the safety in the charging and discharging process of the power battery pack is improved.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.

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, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. The single battery is characterized by comprising a pole column, a connecting sheet (1), a pole lug and a heat conducting structure;

the connecting piece comprises a pole connecting part (11), a protecting part (10) and a pole lug connecting part (12), wherein the protecting part (10) is positioned between the pole connecting part (11) and the pole lug connecting part (12), the pole connecting part (11) is welded with the pole, and the pole lug connecting part (12) is welded with the pole lug;

the heat conducting structure is coated on the outer side of the protection part (10) so as to conduct out heat of the protection part (10).

2. The cell according to claim 1, wherein the thermally conductive structure comprises a thermally conductive housing (2);

the heat conduction shell (2) is internally provided with a hollow cavity (21), and the protection part (10) is embedded in the hollow cavity (21).

3. The cell according to claim 2, wherein the thermally conductive structure further comprises a thermally conductive medium (3);

the heat conducting medium (3) is coated outside the heat conducting shell (2) or filled inside the heat conducting shell (2).

4. A single cell according to claim 3, wherein the heat conducting housing (2) is provided externally with a receiving structure, the heat conducting medium (3) being provided in the receiving structure.

5. The unit cell according to claim 4, characterized in that the receiving structure is a hollow boss (22), and the heat conducting medium (3) is filled in the hollow boss (22).

6. The unit cell according to claim 4, characterized in that the receiving structure is a groove (23), and the heat conducting medium (3) is filled in the groove (23).

7. The unit cell according to claim 2, characterized in that the surface of the heat conductive housing (2) is provided with an opening (24) to allow the hollow cavity (21) to communicate with the outside.

8. The unit cell according to claim 2, characterized in that the surface of the heat conductive housing (2) is provided with heat radiating fins (25), the heat radiating fins (25) being distributed in an array.

9. The unit cell according to claim 1, characterized in that the central region of the protection part (10) is provided with a fuse protection structure (101).

10. A power battery pack comprising the single battery according to any one of claims 1 to 9.

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