CN218448161U - Cylindrical battery - Google Patents

Abstract

The utility model relates to a battery technology field provides a cylinder battery, include: a cell housing structure; the battery core is arranged in the single battery shell structure and comprises a battery core main body, a first lug and a second lug, the first lug and the second lug which are arranged at intervals extend out from the same end of the battery core main body, and a winding center is formed on the battery core main body; wherein, first utmost point ear and second utmost point ear set up along the circumferential direction at coiling center, and along the radial direction at coiling center, the length of first utmost point ear is greater than the length of second utmost point ear, thereby can make first utmost point ear and second utmost point ear can be on the basis of specific enough overcurrent capacity, also can make and to have certain distance between first utmost point ear and the second utmost point ear, thereby with first utmost point ear and second utmost point ear rational arrangement in electricity core main part, increase the space utilization of electricity core main part, use performance with this improvement cylindrical battery.

Description

Cylindrical battery

Technical Field

The utility model relates to a battery technology field especially relates to a cylinder battery.

Background

In the correlation technique, the cylindrical battery can include the utmost point ear that the interval set up, because utmost point ear structural limitation, the position relation between the adjacent utmost point ear is difficult to control to the unreasonable problem of overall arrangement can appear.

SUMMERY OF THE UTILITY MODEL

The utility model provides a cylindrical battery to improve cylindrical battery's performance.

According to the utility model discloses a first aspect provides a cylindrical battery, include:

a cell housing structure;

the battery core is arranged in the single battery shell structure and comprises a battery core main body, a first lug and a second lug, the first lug and the second lug which are arranged at intervals extend out from the same end of the battery core main body, and a winding center is formed on the battery core main body;

the first pole lug and the second pole lug are arranged along the circumferential direction of the winding center, and the length of the first pole lug is greater than that of the second pole lug along the radial direction of the winding center.

The utility model discloses the cylinder battery includes battery cell housing structure and electric core, electric core sets up in battery cell housing structure, electric core includes the electric core main part, first utmost point ear and second utmost point ear, first utmost point ear and the second utmost point ear through making the interval set up along the circumference direction at coiling center sets up, and on the radial direction at coiling center, the length of first utmost point ear is greater than the length of second utmost point ear, thereby can make first utmost point ear and second utmost point ear can be on the basis of specific enough overcurrent capacity, also can make and to have certain distance between first utmost point ear and the second utmost point ear, thereby with first utmost point ear and the reasonable overall arrangement of second utmost point ear in electric core main part, increase the space utilization of electric core main part, thereby improve cylinder battery's performance.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

FIG. 1 is a schematic diagram of a battery shown in accordance with an exemplary embodiment;

fig. 2 is a schematic diagram illustrating a cell structure of a battery according to an exemplary embodiment;

FIG. 3 is a schematic diagram illustrating a partially unrolled configuration of a jellyroll of a battery according to one exemplary embodiment;

fig. 4 is a graph illustrating an arrangement trend of tab layers of a battery according to an exemplary embodiment.

The reference numerals are explained below:

10. a cell housing structure; 20. an electric core; 21. a cell main body; 211. a winding center; 22. a first tab; 221. a first monolithic tab; 23. a second tab; 231. a second monolithic tab; 24. a third tab; 25. a fourth tab; 30. pole structure.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it should be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in the context of a connection between one element or feature and another element(s), "on," "under," or "inside" or "outside," it can be directly connected to the other element(s) "on," "under" or "inside" or "outside," or indirectly connected to the other element(s) "on," "under" or "inside" or "outside" through intervening elements.

An embodiment of the present invention provides a cylindrical battery, please refer to fig. 1 to fig. 3, the cylindrical battery includes: a battery cell housing structure 10; the battery cell 20 is disposed in the single battery casing structure 10, the battery cell 20 includes a cell main body 21, a first tab 22 and a second tab 23, the first tab 22 and the second tab 23 disposed at intervals extend from the same end of the cell main body 21, and the cell main body 21 is formed with a winding center 211; the first tab 22 and the second tab 23 are arranged along the circumferential direction of the winding center 211, and the length of the first tab 22 is greater than that of the second tab 23 along the radial direction of the winding center 211.

The utility model discloses the cylindrical battery of an embodiment includes battery cell housing structure 10 and electric core 20, electric core 20 sets up in battery cell housing structure 10, electric core 20 includes electric core main part 21, first utmost point ear 22 and second utmost point ear 23, through making first utmost point ear 22 and the second utmost point ear 23 that the interval set up along the circumference direction setting of coiling center 211, and on the radial direction of coiling center 211, the length of first utmost point ear 22 is greater than the length of second utmost point ear 23, thereby can make first utmost point ear 22 and second utmost point ear 23 can be on the basis of specific enough overcurrent capacity, also can make and to have certain distance between first utmost point ear 22 and the second utmost point ear 23, thereby rationally arrange first utmost point ear 22 and second utmost point ear 23 on electric core main part 21, increase electric core main part 21's space utilization, use performance with this improvement cylindrical battery.

It is noted that the cylindrical battery includes a cell and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding a stacking part, and the stacking part comprises a first pole piece, a partition and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. And the polarities of the first pole piece and the second pole piece can be interchanged. The first pole piece and the second pole piece are coated with active materials.

The cylindrical battery can be a winding battery, that is, a first pole piece, a second pole piece with an opposite electrical property to the first pole piece, and a diaphragm piece arranged between the first pole piece and the second pole piece are wound to obtain a winding battery core. After the winding type battery cell is formed, a winding center 211 is formed in the middle of the battery cell main body 21, and the winding center 211 may be a circular hole, for example, when the first pole piece and the second pole piece are a positive pole piece and a negative pole piece, respectively, a positive pole tab and a negative pole tab may also be formed on the first pole piece and the second pole piece, respectively.

The first tab 22 and the second tab 23 may be formed on the first pole piece and the second pole piece, respectively, so that the first tab 22 and the second tab 23 form a positive tab and a negative tab, respectively, and the length of the first tab 22 is greater than that of the second tab 23 along the radial direction of the winding center 211, on the basis of ensuring that the first tab 22 has sufficient overcurrent capacity, the insulation distance between the first tab 22 and the second tab 23 may be conveniently controlled, for example, one side of the first tab 22 away from the winding center 211 and one side of the second tab 23 away from the winding center 211 are on the same ring of the battery cell 20, at this time, the other side of the first tab 22 close to the winding center 211 may be closer to the winding center 211 than the other side of the second tab 23 close to the winding center 211, so that the insulation distance between the first tab 22 and the second tab 23 may be increased, and the risk of insulation failure of the first tab 22 and the second tab 23 is avoided.

The first tab 22 and the second tab 23 may be formed on the first pole piece or the second pole piece simultaneously, at this time, the first tab 22 and the second tab 23 arranged at an interval may form a positive pole tab or a negative pole tab simultaneously, and in the radial direction of the winding center 211, the length of the first tab 22 is greater than that of the second tab 23, so that the first tab 22 and the second tab 23 can be more reasonably arranged on the cell main body 21, thereby increasing the overcurrent capacity of the first tab 22 and the second tab 23.

The radial direction of the winding center 211 may include a plurality, and the length of the first tab 22 may be taken in a first radial direction of the winding center 211, and the length of the second tab 23 may be taken in a second radial direction of the winding center 211. Further, the length of the first tab 22 may be considered as a distance from one side of the first tab 22 close to the winding center 211 to the other side of the first tab 22 away from the winding center 211, and the length of the second tab 23 may be considered as a distance from one side of the second tab 23 close to the winding center 211 to the other side of the second tab 23 away from the winding center 211. The radial direction of the winding center 211 is represented as a direction from the center of the winding center 211 toward the circumferential outer edge of the cell main body 21.

In one embodiment, the length difference between the first tab 22 and the second tab 23 is 0.2mm-10mm, so that the first tab 22 and the second tab 23 are reasonably arranged on the cell body 21, the space utilization rate of the cell body 21 is increased, and the insulation distance between the first tab 22 and the second tab 23 can be reasonably controlled, thereby improving the safety use performance of the battery.

The difference in length between the first tab 22 and the second tab 23 may be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 9.6mm, 9.7mm, 9.8mm, 9.9mm, or 10mm, and so forth.

In one embodiment, in combination with fig. 3, the first tab 22 and the second tab 23 may be formed on the first pole piece and the second pole piece, respectively, and the structure shown in fig. 3 is a structure in which the first pole piece and the second pole piece are stacked, so that it can be seen that the first single tab 221 of the first tab 22 is drawn first and the second single tab 231 of the second tab 23 is drawn later, and therefore, after the first tab 22 and the second tab 23 are formed by winding, the first tab 22 can be brought closer to the winding center 211, and therefore, the length of the first tab 22 can be made greater than the length of the second tab 23 in the radial direction of the winding center 211.

In one embodiment, the first tab 22 includes a plurality of first single tabs 221, the second tab 23 includes a plurality of second single tabs 231, and the number of the first single tabs 221 is greater than that of the second single tabs 231 in a radial direction of the winding center 211, so that the length of the first tab 22 can be made greater than that of the second tab 23, thereby increasing the overcurrent capacity of the first tab 22.

The plurality of first single tabs 221 can be folded to form the first tab 22, and the plurality of second single tabs 231 can be folded to form the second tab 23, so that the length of the first tab 22 can be ensured to be greater than that of the second tab 23 after the plurality of first single tabs 221 and the plurality of second single tabs 231 are folded.

In one embodiment, in the radial direction of the winding center 211, the first tab 22 includes a plurality of first monolithic tabs 221, the second tab 23 includes a plurality of second monolithic tabs 231, the tightness of the plurality of first monolithic tabs 221 is greater than the tightness of the plurality of second monolithic tabs 231, and the length of the first tab 22 is greater than the length of the second tab 23, so that the first tab 22 may have higher connection strength compared with the second tab 23, and the overcurrent capacity of the first tab 22 may be stronger, so that problems such as insufficient solder and the like do not easily occur, and the connection stability of the first tab 22 and the electrode lead-out structure may be ensured.

In one embodiment, the first tab 22 includes a plurality of first one-piece tabs 221, the second tab 23 includes a plurality of second one-piece tabs 231, the number of the first one-piece tabs 221 is not greater than the number of the second one-piece tabs 231, and the tightness of the plurality of first one-piece tabs 221 is less than the tightness of the plurality of second one-piece tabs 231 in a radial direction of the winding center 211, so that the length of the first tab 22 can also be made greater than the length of the second tab 23. By controlling the tightness of the first single-sheet tabs 221 and the second single-sheet tabs 231, the length of the first tab 22 can be greater than that of the second tab 23 under the condition of inconsistent quantity, and the condition that the quantity of the first single-sheet tabs 221 is too large can be avoided to a certain extent, so that the problem that the weight of the battery cell 20 is too large is caused.

In one embodiment, in the radial direction of the winding center 211, the first tab 22 includes a plurality of first single tabs 221, the second tab 23 includes a plurality of second single tabs 231, and the length of at least one first single tab 221 of the plurality of first single tabs 221 is greater than the length of the second single tab 231, so that the length of the first tab 22 is also greater than the length of the second tab 23, that is, the first single tab 221 with the greater length can be drawn toward the winding center 211 when drawn, so that the first single tab 221 can extend toward a position close to the winding center 211, thereby increasing the length dimension of the first tab 22 in the radial direction of the winding center 211.

The length of the first single-sheet tab 221 is the length of the first single-sheet tab 221 along the leading-out direction thereof, the length of the second single-sheet tab 231 is the length of the second single-sheet tab 231 along the leading-out direction thereof, the plurality of first single-sheet tabs 221 need to be folded to form the first tab 22, and correspondingly, the plurality of second single-sheet tabs 231 need to be folded to form the second tab 23.

The drawing direction of the first single tab 221 may be considered as an extending direction of the first single tab 221 after the first single tab 221 is straightened, and correspondingly, the drawing direction of the second single tab 231 may be considered as an extending direction of the second single tab 231 after the second single tab 231 is straightened, and the extending direction of the first single tab 221 and the extending direction of the second single tab 231 are both parallel to the axial direction of the winding center 211.

It should be noted that, in the radial direction of the winding center 211, the length of the first tab 22 is greater than that of the second tab 23, and the lengths of the first tab 22 and the second tab 23 may be controlled by controlling the tightness between the single tabs, or the lengths of the first tab 22 and the second tab 23 may be controlled by controlling the number of the single tabs, or the lengths of the first tab 22 and the second tab 23 may be controlled by controlling the lengths of the single tabs in the lead-out direction thereof.

The tightness between the one-piece tabs may be regarded as a pressing force formed between the adjacent two one-piece tabs, which is relatively small and thus small, and the tightness is relatively large when the pressing force between the adjacent two one-piece tabs is relatively large, for example, when the first tab 22 is formed by the three first one-piece tabs 221 and the second tab 23 is formed by the three second one-piece tabs 231, the pressing force between the three first one-piece tabs 221 may be made relatively small and the pressing force between the three second one-piece tabs 231 may be made relatively large, so that the tightness between the three first one-piece tabs 221 may be made smaller than the tightness between the three second one-piece tabs 231, whereby the length of the first tab 22 may be made larger than the length of the second tab 23 in the radial direction of the winding center 211.

For example, when the first tab 22 is formed by three first single tabs 221 and the second tab 23 is formed by three second single tabs 231, the lengths of the three first single tabs 221 in the lead-out direction thereof are greater than the lengths of the three second single tabs 231 in the lead-out direction thereof, and at this time, when the three first single tabs 221 are folded, the three first single tabs 221 may be integrally extended toward the winding center 211, and correspondingly, the three second single tabs 231 may also be integrally extended toward the winding center 211, but since the lengths of the first single tabs 221 in the lead-out direction thereof are greater than the lengths of the second single tabs 231 in the lead-out direction thereof, the extension lengths of the three first single tabs 221 in the direction toward the winding center 211 may be greater than the extension lengths of the three second single tabs 231 in the direction toward the winding center 211, and therefore, the length of the first tab 22 in the radial direction along the winding center 211 may be greater than the length of the second tab 23.

In some embodiments, it is not excluded that the thickness of the first one-piece tab 221 may be greater than that of the second one-piece tab 231, and thus, even though the number of the first one-piece tabs 221 and the number of the second one-piece tabs 231 are identical, the tightness of the first one-piece tab 221 and the tightness of the second one-piece tab 231 are identical, and the length of the first one-piece tab 221 and the length of the second one-piece tab 231 are identical, it is still possible to ensure that the length of the first tab 22 is greater than the length of the second tab 23 in the radial direction of the winding center 211.

In one embodiment, the first tab 22 and the second tab 23 have the same polarity, i.e., the first tab 22 and the second tab 23 may form a positive tab or a negative tab at the same time.

In one embodiment, the first and second tabs 22, 23 are of opposite polarity, i.e., one of the first and second tabs 22, 23 forms a positive tab and the other forms a negative tab.

In one embodiment, the first tab 22 forms a part of a positive tab, and the positive tab includes a plurality of positive tab layers disposed at intervals along the winding direction of the cell main body 21, and the distance between adjacent positive tab layers gradually increases, then gradually decreases, and finally gradually increases, and the tab layers include one or more positive single-piece tabs, so that a first tab 22 with a longer length can be formed on the cell main body 21.

In the winding direction of the electric core main body 21, the positive electrode tab includes a plurality of positive electrode tab layers arranged at intervals, that is, each ring of the positive electrode tab may include one positive electrode tab layer or at least two positive electrode tab layers, for example, when the positive electrode tab may only include one first electrode tab 22 with a longer length, the position of the positive electrode tab near the winding center 211 may be provided with one positive electrode tab layer on the ring, in this process, because the radius of each ring is gradually increased, the distance between the adjacent positive electrode tab layers is gradually increased first. And after coiling to certain number of turns, can be provided with a plurality of spaced positive pole utmost point ear layers on the round, in this process, have a positive pole utmost point ear layer to have a plurality of positive pole utmost point ear layers by the round, although the radius on corresponding circle has increased, but the distance between the adjacent positive pole utmost point ear layer has a process that reduces, however, along with the radius of every circle behind increases gradually, consequently the distance between the adjacent positive pole utmost point ear layer increases gradually again at last, can form a longer first utmost point ear 22 of length in this process, and can form the utmost point ear of shorter length.

In one embodiment, the second tab 23 forms a part of a negative tab, and the negative tab includes a plurality of negative tab layers arranged at intervals along the winding direction of the cell main body 21, the distance between adjacent negative tab layers gradually increases, then gradually decreases, and finally gradually increases, and the negative tab layers include one or more negative single-sheet tabs, so that at least one second tab 23 with a shorter length can be formed on the cell main body 21.

In the winding direction of the electric core main body 21, the negative electrode tab includes a plurality of negative electrode tab layers arranged at intervals, that is, each ring of the negative electrode tab may include one negative electrode tab layer or at least two negative electrode tab layers, for example, when the negative electrode tab may only include a second electrode tab 23 with a shorter length, the position of the negative electrode tab close to the winding center 211 may be provided with one negative electrode tab layer in one ring, in this process, because the radius of each ring is gradually increased, the distance between adjacent negative electrode tab layers is first gradually increased. And after winding to a certain number of turns, a plurality of spaced negative pole tab layers can be arranged on one turn, in the process, one negative pole tab layer is arranged on one turn to a plurality of negative pole tab layers, although the radius on the corresponding turn is increased, the distance between the adjacent negative pole tab layers can be reduced, however, the distance between the adjacent negative pole tab layers is gradually increased along with the radius of each turn, and therefore, the distance between the adjacent negative pole tab layers is finally gradually increased, in the process, a tab with a longer length can be formed, and a second tab 23 with a relatively shorter length can be formed.

In one embodiment, the first tab 22 forms a portion of a positive tab, the second tab 23 forms a portion of a negative tab, and the battery cell 20 is formed by winding a winding unit, wherein the winding unit includes a plurality of tab layers arranged at intervals along a winding direction of the battery cell main body 21, a distance between adjacent tab layers gradually increases, then gradually decreases, and finally gradually increases, and the tab layers include one or more single-piece tabs.

The winding unit may include a positive electrode sheet and a negative electrode sheet, which are stacked, and a separator may be disposed between the positive electrode sheet and the negative electrode sheet. The winding unit comprises a plurality of tab layers arranged at intervals, each tab layer comprises an anode tab layer and a cathode tab layer, the anode tab layer can be provided with a plurality of anode tab layers arranged at intervals, the cathode tab layer can be provided with a plurality of cathode tab layers arranged at intervals, the winding unit is straightened, and the anode tab layer and the cathode tab layer are arranged at intervals and are staggered, the distance between the anode tab layer and the cathode tab layer is gradually increased firstly and then gradually reduced finally, and finally, the distance between the anode tab layer and the cathode tab layer is gradually increased finally, so that a first tab 22 with longer length can be formed on the electric core main body 21, a second tab 23 with shorter length and other tabs are formed, and the limitation is not made here.

It should be noted that, in conjunction with fig. 4, fig. 4 may be represented as an arrangement trend graph of the positive electrode tab layers, where X may be represented as an extending direction of the plurality of positive electrode tab layers, Y is represented as a distance between adjacent positive electrode tab layers, and S shows a variation trend of the distance between the positive electrode tab layers. Correspondingly, fig. 4 may also be represented as an arrangement trend graph of the negative electrode tab layers, where X may be an extending direction of the plurality of negative electrode tab layers, Y is a distance between adjacent negative electrode tab layers, and S shows a variation trend of the distance between the negative electrode tab layers.

Accordingly, fig. 4 may also be represented as an arrangement trend graph of the tab layers of the winding unit, wherein X may be represented as an extending direction of the plurality of tab layers, Y is represented as a distance between adjacent tab layers, and S shows a variation trend of the distance between the tab layers.

Fig. 4 can be used to show the trend of the three different distances, which is explained without considering the specific distance value, and is only used to show the trend of the distance.

In one embodiment, as shown in fig. 2, the number of the second tabs 23 is two, and the first tab 22 is located between the two second tabs 23, so that the overcurrent capacity of the second tabs 23 can be ensured on the basis of ensuring that the second tabs 23 have a reliable insulation distance from the first tab 22.

In one embodiment, as shown in fig. 2, the battery cell 20 further includes a third tab 24, the polarity of the third tab 24 is the same as that of the second tab 23, and the length of the third tab 24 is greater than that of the second tab 23 along the radial direction of the winding center 211, so that the overcurrent capacity of the second tab 23 and the third tab 24 with the same polarity can be further increased, and the connection strength with the electrode lead-out structure can be improved.

In one embodiment, as shown in fig. 2, the battery cell 20 further includes two fourth tabs 25, the polarity of the fourth tab 25 is the same as that of the first tab 22, the third tab 24 is located between the two fourth tabs 25, and the length of the fourth tab 25 is smaller than that of the first tab 22 in the radial direction of the winding center 211, so that reliable insulation capability can be provided between the fourth tab 25 and the third tab 24 on the basis of ensuring that the first tab 22 and the fourth tab 25 have reliable overcurrent capability.

In one embodiment, the distances between the first tab 22, the second tab 23, the third tab 24 and the fourth tab 25 from the winding center 211 are all greater than 0. The first tab 22 and the fourth tab 25 have the same polarity, while the first tab 22 and the third tab 24 have the same polarity, and the first tab 22 and the second tab 23 have opposite polarities.

In one embodiment, the first tab 22 and the second tab 23 are arranged along the circumferential direction of the winding center 211, which is not only simple in structure, but also can ensure that the first tab 22 and the second tab 23 have reliable overcurrent capacity on the basis of ensuring the insulation gap between the first tab 22 and the second tab 23.

As shown in connection with fig. 2, the first tab 22, the second tab 23, the fourth tab 25, the third tab 24, the fourth tab 25, and the second tab 23 may be disposed at intervals in a circumferential direction of the winding center 211 such that the first tab 22 and the two fourth tabs 25 are used to form a positive electrode tab, and the two second tabs 23 and the third tabs 24 may be used to form a negative electrode tab, or the first tab 22 and the two fourth tabs 25 are used to form a negative electrode tab, and the two second tabs 23 and the third tabs 24 may be used to form a positive electrode tab.

In one embodiment, the area of the end surface of the first tab 22 away from the cell main body 21 is larger than the area of the end surface of the second tab 23 away from the cell main body 21, so that a larger contact area between the first tab 22 and the electrode lead-out structure can be achieved, thereby increasing the overcurrent capacity between the first tab 22 and the electrode lead-out structure.

The area of the end surface of the first tab 22 away from the cell main body 21 is larger than the area of the end surface of the fourth tab 25 away from the cell main body 21, and the area of the end surface of the third tab 24 away from the cell main body 21 is larger than the area of the end surface of the second tab 23 away from the cell main body 21.

It should be noted that, taking the battery cell 20 in fig. 2 as an example, the first tab 22 and the two fourth tabs 25 are used to form a positive tab, and the two second tabs 23 and the third tabs 24 may be used to form a negative tab, at this time, along the winding direction of the battery cell main body 21, the positive tab includes a plurality of positive tab layers arranged at intervals, and a distance between adjacent positive tab layers gradually increases, then gradually decreases, and finally gradually increases, along the winding direction of the battery cell main body 21, the negative tab includes a plurality of negative tab layers arranged at intervals, and a distance between adjacent negative tab layers gradually increases, then gradually decreases, and finally gradually increases, so that after the battery cell 20 is formed by winding, the battery cell 20 as shown in fig. 2 may be formed.

In one embodiment, as shown in fig. 1, the cylindrical battery further includes a pole structure 30, the pole structure 30 may be disposed on the single battery housing structure 10, the battery cell 20 may be electrically connected to the pole structure 30, for example, a first tab 22 of the battery cell 20 may be electrically connected to the pole structure 30, the pole structure 30 may be disposed in an insulating manner with respect to the single battery housing structure 10, and a second tab 23 of the battery cell 20 may be electrically connected to the single battery housing structure 10.

The cylindrical battery may include two pole structures 30, and the first tab 22 and the second tab 23 of the battery cell 20 may be electrically connected to the two pole structures 30, respectively.

In one embodiment, the battery cell housing structure 10 may include a cover plate on which the terminal post structure 30 may be disposed and a housing member formed with a receiving space, so that effective protection of the battery cell 20 is achieved after the cover plate and the housing member are connected. The cover plate and the housing member may be welded, or the cover plate and the housing member may be riveted.

An embodiment of the utility model also provides a group battery, including foretell cylinder battery.

The utility model discloses the cylinder battery of group battery of an embodiment includes battery cell housing structure 10 and electric core 20, electric core 20 sets up in battery cell housing structure 10, electric core 20 includes electric core main part 21, first utmost point ear 22 and second utmost point ear 23, through making first utmost point ear 22 and the second utmost point ear 23 that the interval set up along the circumference direction setting of coiling center 211, and on the radial direction of coiling center 211, the length of first utmost point ear 22 is greater than the length of second utmost point ear 23, thereby can make first utmost point ear 22 and second utmost point ear 23 can be on the basis of specific enough overcurrent capacity, also can make and to have certain distance between first utmost point ear 22 and the second utmost point ear 23, thereby with first utmost point ear 22 and the reasonable overall arrangement of second utmost point ear 23 on electric core main part 21, increase electric core main part 21's space utilization, use performance with this improvement group battery.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module comprises a plurality of cylindrical batteries, and the battery module also comprises a bracket, wherein the batteries can be fixed on the bracket.

The battery pack comprises a plurality of cylindrical batteries and a box body, and the box body is used for fixing the cylindrical batteries.

It should be noted that, the battery package includes the cylinder battery, and the cylinder battery can be a plurality of, and a plurality of cylinder batteries set up in the box. Wherein, a plurality of cylinder batteries can form and install in the box behind the battery module. Or, a plurality of cylinder batteries can directly set up in the box, need not to carry out in groups a plurality of cylinder batteries promptly, utilize the box to fix a plurality of cylinder batteries.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the disclosure is limited only by the appended claims.

Claims (15)

1. A cylindrical battery, comprising:

a cell housing structure (10);

the battery cell (20) is arranged in the single battery shell structure (10), the battery cell (20) comprises a cell main body (21), a first pole lug (22) and a second pole lug (23), the first pole lug (22) and the second pole lug (23) which are arranged at intervals extend out from the same end of the cell main body (21), and a winding center (211) is formed on the cell main body (21);

the first pole lug (22) and the second pole lug (23) are arranged along the circumferential direction of the winding center (211), and the length of the first pole lug (22) is greater than that of the second pole lug (23) along the radial direction of the winding center (211).

2. The cylindrical battery according to claim 1, wherein the difference in length between the first tab (22) and the second tab (23) is 0.2mm-10mm.

3. The cylindrical battery according to claim 1, wherein the first tab (22) comprises a plurality of first single-piece tabs (221) and the second tab (23) comprises a plurality of second single-piece tabs (231) in a radial direction of the winding center (211), and the number of the first single-piece tabs (221) is greater than the number of the second single-piece tabs (231).

4. The cylindrical battery according to claim 1, wherein the first tab (22) comprises a plurality of first one-piece tabs (221) and the second tab (23) comprises a plurality of second one-piece tabs (231) in a radial direction of the winding center (211), and a tightness of the plurality of first one-piece tabs (221) is greater than a tightness of the plurality of second one-piece tabs (231).

5. The cylindrical battery according to claim 1, wherein the first tab (22) comprises a plurality of first one-piece tabs (221) and the second tab (23) comprises a plurality of second one-piece tabs (231) in a radial direction of the winding center (211), the number of the first one-piece tabs (221) is not more than the number of the second one-piece tabs (231), and the tightness of the plurality of first one-piece tabs (221) is less than the tightness of the plurality of second one-piece tabs (231).

6. The cylindrical battery according to claim 1, wherein the first tab (22) comprises a plurality of first one-piece tabs (221), the second tab (23) comprises a plurality of second one-piece tabs (231), and a length of at least one of the first one-piece tabs (221) among the plurality of first one-piece tabs (221) is greater than a length of the second one-piece tab (231), in a radial direction of the winding center (211);

the length of the first single-sheet tab (221) is the length of the first single-sheet tab (221) along the leading-out direction of the first single-sheet tab, and the length of the second single-sheet tab (231) is the length of the second single-sheet tab (231) along the leading-out direction of the second single-sheet tab.

7. Cylindrical battery according to claim 1, characterized in that the first tab (22) and the second tab (23) are of the same polarity.

8. Cylindrical battery according to claim 1, characterized in that the first tab (22) and the second tab (23) are of opposite polarity.

9. The cylindrical battery according to claim 8, wherein the first tab (22) forms a part of a positive tab, and the positive tab comprises a plurality of positive tab layers arranged at intervals along the winding direction of the cell main body (21), and the distance between the adjacent positive tab layers is gradually increased, gradually decreased and gradually increased, and the tab layers comprise one or more positive single-piece tabs.

10. The cylindrical battery as claimed in claim 9, wherein the second tab (23) forms a part of a negative tab, and the negative tab comprises a plurality of negative tab layers arranged at intervals along the winding direction of the cell main body (21), the distance between the adjacent negative tab layers is gradually increased, then gradually decreased, and finally gradually increased, and the negative tab layers comprise one or more negative single-sheet tabs.

11. The cylindrical battery according to claim 8, wherein the first tab (22) forms a portion of a positive tab, the second tab (23) forms a portion of a negative tab, the battery cell (20) is formed by winding a winding unit, the winding unit comprises a plurality of tab layers arranged at intervals along a winding direction of the battery cell main body (21), a distance between the adjacent tab layers is gradually increased, then gradually decreased, and finally gradually increased, and the tab layers comprise one or more single tabs.

12. The cylindrical battery according to any one of claims 8 to 11, wherein the number of the second tabs (23) is two, and the first tab (22) is located between the two second tabs (23).

13. The cylindrical battery according to claim 10, wherein the battery core (20) further comprises a third tab (24), the polarity of the third tab (24) is the same as that of the second tab (23), and the length of the third tab (24) is greater than that of the second tab (23) in the radial direction of the winding center (211).

14. The cylindrical battery according to claim 13, wherein the battery core (20) further comprises two fourth tabs (25), the polarity of the fourth tabs (25) is the same as that of the first tabs (22), the third tabs (24) are located between the two fourth tabs (25), and the length of the fourth tabs (25) is smaller than that of the first tabs (22) along the radial direction of the winding center (211).

15. The cylindrical battery according to one of claims 1 to 11, wherein the area of the end face of the first tab (22) facing away from the cell body (21) is greater than the area of the end face of the second tab (23) facing away from the cell body (21).

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