CN215184190U - Square lithium battery - Google Patents

Abstract

The utility model relates to a battery technology field provides a square lithium cell, including casing, top cap, coiling electricity core and first heat-conducting piece. Be equipped with anodal pin and negative pole pin on the top cap, lay in the outside of coiling electric core along the big face direction of coiling electric core in first heat-conducting piece to, the relative both ends of first heat-conducting piece are connected respectively in anodal pin and negative pole pin. Through having add first heat conduction spare, the work heat production that is about to convolute electric core is scattered in vertical direction through first heat conduction spare to, in order to guarantee the installation stability of first heat conduction spare, connect the relative both ends of first heat conduction spare respectively on anodal pin and negative pole pin, simultaneously, also increase the heat dissipation way of first heat conduction spare, promptly, first heat conduction spare still can be through anodal pin and negative pole pin with the work heat production transmission of coiling electrical property to the outside. In conclusion, the heat dissipation capacity of the winding battery cell is greatly improved by additionally arranging the first heat-conducting piece.

Description

Square lithium battery

Technical Field

The utility model relates to the technical field of batteries, especially, provide a square lithium cell.

Background

The square lithium battery mainly has two assembling modes: lamination and winding, wherein, the winding type square lithium battery has the advantages of high energy density, high power density and the like, but when in use, especially in the rapid charging and discharging process, a large amount of heat is generated, and if the heat is not dissipated in time, safety problems and even explosion can be caused. The existing winding battery core of the square lithium battery in the market at present has slow heat dissipation in the direction vertical to the upper top cover, so that the large-area central temperature of the inner winding core of the winding battery core is higher.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a square lithium cell aims at solving the poor problem of coiling electricity core heat dissipation of current square lithium cell.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a square lithium battery, includes the casing, the lid locates the top cap of casing and locates the coiling electric core in the casing, is equipped with on the top cap to stretch into in the casing and connect in the anodal pin and the negative pole pin of the utmost point ear of coiling electric core, and square lithium battery still includes first heat-conducting piece, and first heat-conducting piece lays in the outside of coiling electric core on the big face direction of coiling electric core to, the relative both ends of first heat-conducting piece are connected respectively in anodal pin and negative pole pin.

The utility model has the advantages that: the utility model provides a square lithium cell has add first heat conduction spare, and, lay first heat conduction spare in the outside of coiling electric core, the work heat production that is about to coil electric core is effluvized in vertical direction through first heat conduction spare, and, in order to guarantee the installation stability of first heat conduction spare, connect the relative both ends of first heat conduction spare respectively on anodal pin and negative pole pin, and simultaneously, also increase the heat dissipation approach of first heat conduction spare, namely, first heat conduction spare still can be through anodal pin and negative pole pin with the work heat production transmission of coiling electrical property to the outside. In conclusion, the heat dissipation capacity of the winding battery cell is greatly improved by additionally arranging the first heat-conducting piece.

In one embodiment, the square lithium battery further comprises a plurality of second heat conducting members, and each second heat conducting member is arranged in the winding core.

Through adopting above-mentioned technical scheme, each second heat-conducting piece sets up in the coiling electricity core, and like this, the work heat production of coiling electricity core inside passes to outside at vertical direction through each second heat-conducting piece, further improves the heat-sinking capability of coiling electricity core.

In one embodiment, the second heat-conducting members are arranged at intervals in the wound cell in a direction perpendicular to the large face of the wound cell.

By adopting the technical scheme, the specific arrangement form of the second heat-conducting pieces is determined, namely the second heat-conducting pieces are arranged in the winding battery cell at intervals in the direction perpendicular to the large surface of the winding battery cell and are parallel to the first heat-conducting pieces, so that the contact area between each second heat-conducting piece and the winding battery cell is larger, and the heat dissipation capacity of the winding battery cell in the vertical direction is further improved.

In one embodiment, the first heat conducting member is provided with a first notch structure for avoiding welding marks of the tab and the corresponding pin of the winding battery core.

Through adopting above-mentioned technical scheme, utilize first breach structure to dodge the utmost point ear of coiling electric core and the seal area that welds that corresponds the pin, make things convenient for first heat-conducting piece installation.

In one embodiment, the second heat conducting member is provided with a second notch structure for avoiding the winding battery core.

Through adopting above-mentioned technical scheme, utilize second breach structure to dodge coiling electric core, make things convenient for the second heat-conducting piece to insert or extract in coiling electric core.

In one embodiment, the square lithium battery further comprises a third heat conducting member, and the third heat conducting member is arranged on the outer side of the winding battery core along a direction perpendicular to the large surface of the winding battery core.

Through adopting above-mentioned technical scheme, increase the quantity of the heat conduction piece in the coiling electricity core outside, specifically, the direction of laying of third heat conduction piece is perpendicular to each other with the side of laying of first heat conduction piece.

In one embodiment, the third heat-conducting member is connected to the adjacent first heat-conducting member.

Through adopting above-mentioned technical scheme, the third heat-conducting piece is except self heat dissipation, still can transmit the work heat production of coiling electricity core to the outside through first heat-conducting piece.

In one embodiment, the square lithium battery further comprises a heat conducting glue structure, one end of the heat conducting glue structure is connected to the positive electrode pin and/or the negative electrode pin, and the other end of the heat conducting glue structure is abutted against the inner side of the bottom of the shell.

Through adopting above-mentioned technical scheme, utilize the heat conduction adhesive construction to improve the heat-conduction efficiency of anodal pin and negative pole pin to, the heat of anodal pin and negative pole pin is dispersed to the outside through the heat conduction adhesive construction by the bottom of casing.

In one embodiment, the heat conducting glue structure comprises a heat conducting glue body used for abutting against the shell and a heat conducting connecting part which is formed by the heat conducting glue body protruding outwards and used for connecting the positive electrode pin and/or the negative electrode pin.

By adopting the technical scheme, specifically, the heat-conducting glue main body of the heat-conducting glue structure is abutted against the bottom of the shell, and the heat-conducting connecting part is connected with the positive pin and/or the negative pin.

In one embodiment, the first heat conducting member and/or the second heat conducting member are connected to the heat conducting gel structure.

By adopting the technical scheme, the heat on the first heat-conducting piece and/or the second heat-conducting piece can also provide a heat-conducting glue structure to be transferred to the outside of the shell.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a cross-sectional view of a square lithium battery according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a square lithium battery according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a square lithium battery according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a winding core, a first heat conducting member and a second heat conducting member of a square lithium battery provided in an embodiment of the present invention;

fig. 5 is a cross-sectional view of a winding core, a first heat conducting member, a second heat conducting member, and a third heat conducting member of a square lithium battery according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a winding core, a first heat conducting member, a second heat conducting member, and a third heat conducting member of a square lithium battery according to an embodiment of the present invention;

fig. 7 is a front view of a first heat conducting member of a square lithium battery according to an embodiment of the present invention;

fig. 8 is a front view of a second heat conducting member of a square lithium battery according to an embodiment of the present invention;

fig. 9 is a front view of a third heat conducting member of a square lithium battery according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

the battery comprises a shell 10, a top cover 20, a winding battery cell 30, a positive electrode pin 41, a negative electrode pin 42, a first heat conducting piece 50, a second heat conducting piece 60, a straight portion 31, a transition portion 32, a first notch structure 51, a second notch structure 61, a third heat conducting piece 70, a heat conducting glue structure 80, a heat conducting glue main body 81 and a heat conducting connecting portion 82.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Generally, a winding core of a square lithium battery is to place one side of a side face of a wound end in a casing filled with an electrolyte, so that the winding core is in a placing direction, that is, heat dissipation in a vertical direction is poor, and thus, the winding core is not beneficial to a rapid charging and discharging process, and therefore, in view of the above problems, the present application provides a square lithium battery, specifically please refer to the following embodiments:

referring to fig. 1, fig. 2 and fig. 4, the square lithium battery of the present application includes a casing 10, a top cover 20 covering the casing 10, and a winding battery cell 30 disposed in the casing 10, wherein the top cover 20 is provided with a positive electrode pin 41 and a negative electrode pin 42 extending into the casing 10 and connected to tabs of the winding battery cell 30. Here, the top cover 20 and the case 10 form a sealed space for accommodating the wound battery cell 30, the space is filled with an electrolyte, the wound battery cell 30 is formed by stacking and winding a negative electrode sheet, a separator, and a positive electrode sheet, therefore, a tab of the wound battery cell 30 leads out a polarity of the corresponding electrode sheet, and the positive electrode pin 41 and the negative electrode pin 42 on the top cover 20 are correspondingly connected. On the basis, the square lithium battery further includes a first heat conduction member 50, the first heat conduction member 50 is disposed outside the winding battery core 30 along the large-area direction of the winding battery core 30, and opposite ends of the first heat conduction member 50 are respectively connected to the positive electrode pin 41 and the negative electrode pin 42. The wound battery cell 30 is square or oval, i.e. the outline of the wound battery cell has an aspect ratio, so that the large surface of the wound battery cell 30 refers to the larger cross section of the two cross sections of the wound battery cell 30, and then the large surface direction of the wound battery cell 30 refers to the direction of the plane parallel or coplanar with the large cross section, and of course, the small surface direction of the wound battery cell 30 refers to the direction of the plane parallel or coplanar with the smaller cross section. In this way, the first heat conducting member 50 is disposed around the outside of the winding battery cell 30 to exchange heat with the winding battery cell 30, and two opposite sides of the first heat conducting member 50 are respectively connected to the positive electrode pin 41 and the negative electrode pin 42 to form a fixing structure, so as to ensure that the first heat conducting member 50 can abut against the outside of the winding battery cell 30, and finally, heat generated by the operation of the winding battery cell 30 is conducted to the outside through the first heat conducting member 50, the positive electrode pin 41 and the negative electrode pin 42.

The utility model provides a square lithium battery, through addding first heat-conducting piece 50, and, lay first heat-conducting piece 50 in the outside of coiling electric core 30, the work heat production that is about to coil electric core 30 is effluvized in vertical direction through first heat-conducting piece 50, and, in order to guarantee first heat-conducting piece 50's installation stability, connect first heat-conducting piece 50's relative both ends respectively on anodal pin 41 and negative pole pin 42, and simultaneously, also increase first heat-conducting piece 50's heat dissipation way, namely, first heat-conducting piece 50 still can transmit the work heat production of coiling electrical property to the outside through anodal pin 41 and negative pole pin 42. In summary, the heat dissipation capability of the winding core 30 is greatly improved by adding the first heat-conducting member 50.

The first heat conducting member 50 is adapted to the end side surface of the winding core 30, i.e. is plate-shaped or sheet-shaped, and may be made of a material having a heat conducting effect, such as heat conducting silicone rubber, metal, and the like.

In one embodiment, the number of the first heat-conducting members 50 is one, and the first heat-conducting members 50 are disposed on one end side of the wound battery cell 30 parallel to the large-area direction. Of course, according to practical requirements, as shown in fig. 4, the number of the first heat conduction members 50 is two, and the two first heat conduction members 50 are respectively disposed on two end sides of the wound electric core 30 parallel to the large-area direction, that is, the two first heat conduction members 50 are disposed in parallel and spaced from each other, which is two mounting manners of the first heat conduction members 50.

Referring to fig. 4, in an embodiment, the square lithium battery further includes a plurality of second heat-conducting members 60, and each second heat-conducting member 60 is disposed in the winding core 30. It can be understood that the heat generated by the operation in the winding core 30 also needs to be quickly transferred to the outside, and the electrolyte simply flowing in the horizontal direction is far from sufficient, and the electrolyte in the middle of the winding core 30 tends to have a low content. Therefore, each second heat conduction member 60 is disposed inside the wound battery cell 30, so that the heat generated by the operation inside the wound battery cell 30 is transferred to the outside in the vertical direction through each second heat conduction member 60, further improving the heat dissipation capability of the wound battery cell 30. Since the winding core 30 includes the straight portion 31 parallel to the large-plane direction and the transition portion 32 connecting opposite ends of the straight portion 31. Therefore, the second heat-conductive member 60 can be selected at the straight portion 31 in the disposed position; alternatively, at the transition 32; alternatively, it is provided at both the straight portion 31 and the transition portion 32.

Referring to fig. 4, in one embodiment, the second thermal-conductive members 60 are disposed at intervals in the wound battery cell 30 along a direction perpendicular to the large surface of the wound battery cell 30. It is understood that, in this case, each second heat-conducting member 60 is disposed at the straight portion 31 of the wound battery cell 30, and in this case, the second heat-conducting member 60 is plate-shaped or sheet-shaped, and the material of the second heat-conducting member 60 is the same as that of the first heat-conducting member 50, but may be different from that of the first heat-conducting member 50

In one embodiment, each of the second heat-conducting members 60 is disposed in the wound battery cell 30 along the large-area direction of the wound battery cell 30. It is understood that each second heat-conducting member 60 is disposed at the transition portion 32 of the wound battery cell 30. If the winding core 30 is a winding core 30 with a square cross section, the transition portion 32 is also in a straight state, and at this time, the second heat conducting member 60 is in a plate shape or a sheet shape. If the winding core 30 has an oval cross section, the transition portion 32 has a curvature, and at this time, the second heat-conducting member 60 also needs to have a curvature adapted to the curvature.

In one embodiment, each of the second heat-conducting members 60 is disposed at the straight portion 31 and the transition portion 32 of the wound battery cell 30. It is understood that, in this case, the shape of the second heat-conducting member 60 is adapted to the kind of the currently wound battery cell 30, i.e., to the shape of the different portions, so as to reduce the change of the shape of the wound battery cell 30 by the second heat-conducting member 60.

Referring to fig. 7, in one embodiment, the first heat-conducting member 50 is formed with a first notch structure 51. By adopting the above technical scheme, the tab of the winding battery cell 30 and the welding area corresponding to the pin are avoided by using the first notch structure 51, so that the first heat-conducting piece 50 is convenient to mount. Here, the first notch structure 51 may be a square notch, but may be a notch having another shape.

Referring to fig. 8, in an embodiment, the second heat-conducting member 60 is formed with a second notch structure 61. By adopting the above technical scheme, the second notch structure 61 is utilized to avoid the winding battery cell 30, so that the second heat-conducting member 60 can be conveniently pulled out of or inserted into the winding battery cell 30. Here, the second notch structure 61 may be a square notch, but may be a notch having another shape.

Referring to fig. 5, 6 and 9, in an embodiment, the square lithium battery further includes a third heat-conducting member 70, and the third heat-conducting member 70 is disposed outside the winding cell 30 in a direction perpendicular to a large surface of the winding cell 30. It is understood that the wound electric core 30 has two other end sides perpendicular to the large surface direction in addition to the end side parallel to the large surface direction, wherein the third heat-conducting member 70 is disposed on the end side perpendicular to the large surface direction, or one third heat-conducting member 70 is disposed on both end sides thereof, according to the actual use requirement. In this way, the number of heat conductive members outside the wound battery cell 30 is increased, thereby further improving the heat dissipation capability of the wound battery cell 30. Specifically, if the winding core 30 is a winding core 30 with a square cross section, the transition portion 32 is also in a straight state, and at this time, the third heat conduction member 70 is in a plate shape or a sheet shape. If the winding core 30 has an oval cross section, the transition portion 32 has a curvature, and at this time, the third heat conduction member 70 also needs to have a curvature matching with the curvature.

Referring to fig. 6 and 7, in one embodiment, the third heat-conducting member 70 is connected to the adjacent first heat-conducting member 50. By adopting the above technical solution, the third heat conducting member 70 can radiate heat itself, and can transmit heat generated by the winding of the battery cell 30 to the outside through the first heat conducting member 50. And, by connecting the adjacent first heat conduction members 50, the connection stability of the third heat conduction member 70 at the outside of the wound battery cell 30 can also be improved. Specifically, the opposite end sides of the third heat conduction member 70 are respectively connected to the adjacent first heat conduction members 50, that is, the two first heat conduction members 50 and the two third heat conduction members 70 enclose to form an enclosing structure adapted to the outline of the wound battery cell 30.

Referring to fig. 3, in an embodiment, the square lithium battery further includes a thermal conductive paste structure 80, one end of the thermal conductive paste structure 80 is connected to the positive electrode pin 41 and/or the negative electrode pin 42, and the other end of the thermal conductive paste structure 80 abuts against the inner side of the bottom of the case 10. It can be understood that, the connection between the first heat conduction member 50 and the positive pin 41 and the negative pin 42 results in an excessively high heat load on the positive pin 41 and the negative pin 42, and therefore, by adopting the above technical solution, the heat conduction glue structure 80 is utilized to transfer the heat of the positive pin 41 and the negative pin 42 to the bottom of the casing 10, and then the heat is diffused to the outside from the casing 10, so that the heat conduction efficiency of the positive pin 41 and the negative pin 42 is greatly improved.

Specifically, referring to fig. 3, in one embodiment, the thermal conductive adhesive structure 80 includes a thermal conductive adhesive body 81 and a thermal conductive connection portion 82 formed by the thermal conductive adhesive body 81 protruding outward. As can be understood, the heat conductive adhesive main body 81 of the heat conductive adhesive structure 80 abuts against the bottom of the housing 10 to ensure that a necessary connection relationship is formed between the heat conductive adhesive main body and the housing 10, and the heat conductive connection portion 82 is connected to the positive electrode pin 41; alternatively, the negative pin 42 is connected; alternatively, the positive pin 41 and the negative pin 42 are both connected.

In one embodiment, the first thermal conduction member 50 and/or the second thermal conduction member 60 are connected to the thermal conductive adhesive structure 80. It is understood that the first heat conduction member 50 partially overlaps the heat conductive adhesive structure 80 in the arrangement direction, and therefore, the first heat conduction member 50 can also transmit the heat generated by the operation of winding the battery cell 30 to the outside from the bottom of the casing 10 through the heat conductive adhesive structure 80. Specifically, opposite sides of the first heat conduction member 50 are connected to the heat conduction connection portion 82 of the heat conduction adhesive structure 80, that is, the contact heat conduction connection portion 82 transfers heat to the bottom of the housing 10, or the bottom of the first heat conduction member 50 is connected to the heat conduction adhesive main body 81, that is, it directly transfers heat to the bottom of the housing 10 by contacting the heat conduction adhesive main body 81. Similarly, the second heat conducting member 60 is partially overlapped with the heat conducting adhesive structure 80 in the arrangement direction, and therefore, the second heat conducting member 60 can also transmit the heat generated by the winding of the battery cell 30 to the outside from the bottom of the casing 10 through the heat conducting adhesive structure 80. Specifically, the bottom of the second heat conduction member 60 is connected to the heat conduction paste body 81, i.e., it directly transfers heat to the bottom of the housing 10 by contacting the heat conduction paste body 81.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a square lithium battery, includes that casing, lid are located the top cap of casing and locating coiling electric core in the casing, be equipped with on the top cap stretch into in the casing and connect in the anodal pin and the negative pole pin of the utmost point ear of coiling electric core, its characterized in that: the square lithium battery further comprises a first heat-conducting piece, the first heat-conducting piece is arranged on the outer side of the winding battery cell along the large-face direction of the winding battery cell, and the two opposite ends of the first heat-conducting piece are respectively connected to the positive electrode pin and the negative electrode pin.

2. A lithium prismatic battery according to claim 1, characterized in that: the square lithium battery also comprises a plurality of second heat-conducting pieces, and each second heat-conducting piece is arranged in the winding electric core.

3. A lithium prismatic battery according to claim 2, characterized in that: the second heat conducting pieces are arranged in the winding electric core at intervals along the direction perpendicular to the large surface of the winding electric core.

4. A lithium prismatic battery according to claim 1, characterized in that: and a first notch structure used for avoiding welding marks of the lug of the winding battery cell and the corresponding pin is arranged on the first heat conducting piece.

5. A lithium prismatic battery according to claim 3, characterized in that: and a second notch structure for avoiding the winding battery cell is arranged on the second heat conducting piece.

6. A lithium prismatic battery according to claim 1 or 2, characterized in that: the square lithium battery further comprises a third heat-conducting piece, and the third heat-conducting piece is arranged on the outer side of the winding battery cell along the direction perpendicular to the large surface of the winding battery cell.

7. A lithium prismatic battery according to claim 6, characterized in that: the third heat-conducting member is connected to the adjacent first heat-conducting member.

8. A lithium prismatic battery according to claim 2, characterized in that: the square lithium battery further comprises a heat conducting glue structure, one end of the heat conducting glue structure is connected to the positive electrode pin and/or the negative electrode pin, and the other end of the heat conducting glue structure is abutted to the inner side of the bottom of the shell.

9. A lithium prismatic battery according to claim 8, characterized in that: the heat-conducting glue structure comprises a heat-conducting glue main body used for abutting against the shell and a heat-conducting connecting part formed by the heat-conducting glue main body protruding outwards and used for connecting the anode pin and/or the cathode pin.

10. A lithium prismatic battery according to claim 8, characterized in that: the first heat conducting piece and/or the second heat conducting piece are/is connected to the heat conducting glue structure.

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