CN219892261U - Battery cell, battery pack with same and vehicle - Google Patents

Abstract

The embodiment of the utility model provides a battery cell, a battery pack with the battery cell and a vehicle. The battery cell comprises a battery cell body and a tab. The electrode lug comprises an electrode lug body and an extension part, wherein the electrode lug body is connected with the battery cell body, the extension part is connected with the electrode lug body, and the extension part is used for being in contact with the inner wall surface of the battery pack shell so as to promote the heat dissipation rate of the battery cell through the extension part. Therefore, the battery cell provided by the embodiment of the utility model has the advantages of improving the heat dissipation rate of the battery cell and prolonging the service life of the battery cell.

Description

Battery cell, battery pack with same and vehicle

Technical Field

The utility model relates to the technical field of vehicles, in particular to a battery cell, a battery pack with the battery cell and a vehicle.

Background

The battery cell can release a large amount of heat during charging and discharging, the temperature in the battery cell can be increased, the performance of the battery cell and the service life of the battery cell can be influenced when the temperature exceeds a certain temperature, and even the risk of ignition and explosion of the battery cell can be caused at a higher temperature.

The positive and negative lugs of the battery cell are electrically connected with components and parts outside the battery cell through welding, most of heat inside the battery cell is transferred through heat between the pole pieces, most of heat inside the battery cell is transferred through the outer surface of the battery cell to participate in heat exchange, and the other part of heat is transferred to the shell through the lugs, so that the contact between the lugs and the shell is limited, and the problems of low heat conduction efficiency and poor cooling effect exist.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent. To this end, an embodiment of the present utility model proposes a cell. The battery cell has the advantages of improving the heat dissipation rate and prolonging the service life of the battery cell.

The embodiment of the utility model also provides a battery pack.

The embodiment of the utility model also provides a vehicle.

The battery cell provided by the embodiment of the utility model comprises a battery cell body and a tab.

The electrode lug comprises an electrode lug body and an extension part, wherein the electrode lug body is connected with the battery cell body, the extension part is connected with the electrode lug body, and the extension part is used for being in contact with the inner wall surface of the battery pack shell so as to promote the heat dissipation rate of the battery cell through the extension part.

According to the battery cell provided by the embodiment of the utility model, the extending part is arranged in the electrode lug and is contacted with the inner wall surface of the battery pack shell, so that the contact area between the electrode lug and the inner wall surface of the battery pack shell is increased, and the heat exchange rate between the battery cell and the battery pack shell is increased. Therefore, the overall heat dissipation rate of the battery cell and the service life of the battery cell are greatly improved.

In addition, the tab has metal characteristics, has the advantage of high heat dissipation rate, and is beneficial to improving the uniformity of heat in the battery cell. Simultaneously, through extension with the tab body coupling can be with the inside heat (the difference in temperature of the center and the edge of electric core is great) of electric core through the tab conduct to the battery package casing fast on, from this, has further promoted the holistic heat dissipation rate of electric core.

Therefore, the battery cell provided by the embodiment of the utility model has the advantages of improving the heat dissipation rate of the battery cell and prolonging the service life of the battery cell.

In some embodiments, the tab includes a negative tab and a positive tab, each of the negative tab and the positive tab includes the tab body and the extension, the extension of each of the negative tab and the positive tab is in contact with an inner wall surface of the battery pack case.

In some embodiments, the tab includes a negative tab and a positive tab, the negative tab includes the tab body and the extension, and the extension of the negative tab is in contact with an inner wall surface of the battery pack case.

In some embodiments, the battery cell is a laminated battery cell including a plurality of pole pieces, the tab is a plurality of, a plurality of tab and a plurality of pole pieces are arranged in one-to-one correspondence, at least one of the tab has a tab body and an extension, the tab body includes a tab body portion and an external connection portion, the tab body portion is connected with the battery cell body, the external connection portion is used for being connected with an external component, the external connection portion is arranged on one side of the tab body, and the extension is arranged on at least one side of the rest sides of the tab body.

In some embodiments, the battery cell is a winding battery cell, the tab body includes a tab main body portion and an external connection portion that are connected, the tab main body portion is connected with the battery cell body, the external connection portion is used for being connected with an external component, and the external connection portion and the extension portion are oppositely arranged along the height direction of the battery cell.

In some embodiments, the extension and the tab body are a unitary structure.

In some embodiments, the extension is 1mm-3mm beyond the outer edge of the cell body.

The battery pack of the embodiment of the utility model comprises a battery pack shell and the battery cell according to any one of the above, wherein the battery cell is arranged in the battery pack shell, and the extension part is in contact with the inner wall surface of the battery pack shell.

In some embodiments, the battery case body includes a case body and an insulation layer provided at an inner wall surface of the case body, the extension being in contact with the insulation layer.

In some embodiments, the shell body is a metal shell.

In some embodiments, the insulating layer is a thermally conductive insulating layer.

In some embodiments, the battery pack further comprises a water cooling system, the water cooling system and the extension being located on the same side of the cell body.

The vehicle of the embodiment of the utility model comprises the battery pack.

Drawings

Fig. 1 is a cross-sectional view of a cell of one embodiment of the present utility model along its height.

Fig. 2 is an enlarged view at a in fig. 1.

Fig. 3 is a cross-sectional view of a cell according to another embodiment of the present utility model along its height.

Fig. 4 is a cross-sectional view of a cell according to yet another embodiment of the present utility model along its height.

Fig. 5 is a cross-sectional view of a single-layered laminated cell of the present utility model.

Reference numerals:

a battery pack 1000;

a cell 100; a battery pack case 200; a case body 201; an insulating layer 202;

a cell body 1;

a tab 2; a tab body 21; a tab main body portion 211; an external connection portion 212; an extension 22.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

The battery cell 100 according to the embodiment of the present utility model, and the battery pack 1000 and the vehicle having the battery cell 100 are described below with reference to fig. 1 to 5.

The battery cell 100 of the embodiment of the utility model comprises a battery cell body 1 and a tab 2.

The tab 2 includes a tab body 21 and an extension 22, the tab body 21 is connected with the battery cell body 1, the extension 22 is connected with the tab body 21, and the extension 22 is used for contacting with an inner wall surface of the battery pack case 200 so as to promote a heat dissipation rate of the battery cell 100 through the extension 22.

According to the battery cell 100 of the embodiment of the utility model, the extension part 22 is arranged in the tab 2, and the extension part 22 is contacted with the inner wall surface of the battery pack shell 200, so that the contact area between the tab 2 and the inner wall surface of the battery pack shell 200 is increased, and the heat exchange rate between the battery cell 100 and the battery pack shell 200 is increased. Therefore, the overall heat dissipation rate of the battery cell 100 and the service life of the battery cell 100 are greatly improved.

In addition, the tab 2 has a metal characteristic, and has the advantage of fast heat dissipation rate, and is beneficial to improving the uniformity of heat inside the battery cell 100. Meanwhile, the extension 22 is connected to the tab body 21, so that heat inside the battery cell 100 (the temperature difference between the center and the edge of the battery cell 100 is large) can be rapidly conducted to the battery pack case 200 through the tab 2. Thereby, the heat dissipation rate of the entire battery cell 100 is further improved.

Therefore, the battery cell 100 of the embodiment of the utility model has the advantages of improving the heat dissipation rate of the battery cell 100 and prolonging the service life of the battery cell 100.

As shown in fig. 1 to 5, the battery cell 100 may be a laminated battery cell 100, the tab body 21 includes a tab main body portion 211 and an external connection portion 212, the tab main body portion 211 is connected with the battery cell body 1, the external connection portion 212 is used for being connected with an external component, the external connection portion 212 is disposed on one side of the tab 2 main body, and the extension portion 22 is disposed on at least one of the remaining sides of the tab 2 main body. Meanwhile, the laminated cell 100 has the advantage of large energy density and pole piece area.

Specifically, the laminated battery cell 100 includes a plurality of pole pieces stacked in the front-rear direction of the battery cell body 1, the tab main body portion 211 having a first side (for example, an upper side shown in fig. 1) and a second side (for example, a lower side shown in fig. 1) disposed opposite to each other in the width direction of the laminate (up-down direction shown in fig. 1), and the tab main body portion 211 having a third side (for example, a left side shown in fig. 1) and a fourth side (for example, a right side shown in fig. 1) disposed opposite to each other in the length direction of the laminate. If the circumscribed portion 212 is disposed on the first side, the extension portion 22 may be disposed on the third side. In addition, the convenience of installation of the battery cell 100 can be improved.

Further, the cell body 1 has an active material region, and the tab main body portion 211 of the tab body 21 is connected to the active material region, and the external portion 212 of the tab body 21 extends out of the active material region and is electrically connected to an external component (a tab).

The utility model is not limited in this regard and, for example, in other embodiments, the same pole piece may have multiple extensions 22. For example, as shown in fig. 3, if the circumscribed portion 212 is disposed on the first side, the two extension portions 22 may also be disposed on the third side and the fourth side oppositely. For example, as shown in fig. 4, the extension 22 may also be provided on the second side, the third side, and the fourth side. Thereby, the contact area between the tab 2 and the inner wall surface of the battery pack case 200 can be further increased.

The tab 2 includes a negative electrode tab and a positive electrode tab, each of which includes a tab body 21 and an extension 22, and the extension 22 of each of which is in contact with the inner wall surface of the battery pack case 200.

Alternatively, the laminated battery cell 100 includes a plurality of pole pieces stacked in the front-rear direction of the battery cell body 1 (the laminated battery cell 100 is alternately disposed with positive and negative pole pieces), and accordingly, the plurality of tabs 2 are plural, the plurality of tabs 2 are arranged in one-to-one correspondence with the plurality of pole pieces, and at least one of the plurality of tabs 2 has the tab body 21 and the extension portion 22. It is understood that a part of the plurality of tabs 2 may have the extension 22, or each tab 2 may have the extension 22.

Further, the extending portion 22 of the positive tab and the extending portion 22 of the negative tab may be disposed on different sides of the corresponding tab main body portion 211, or may be disposed on the same side of the corresponding tab main body portion 211. Specifically, for example, the extension 22 of the positive tab is correspondingly disposed on the third side of the tab body portion 211, and the extension 22 of the negative tab is disposed on the fourth side and/or the second side of the tab body portion 211.

The negative electrode lugs (according to a serial-parallel connection scheme) can be electrically connected with the total negative electrode outlet and the bus; the positive lugs (according to the serial-parallel connection scheme) can be electrically connected with the total positive electrode and the bus bar, and the total negative electrode, the bus bar and the total positive electrode are all metal pieces with good conductivity.

The present utility model is not limited thereto, and for example, in other embodiments, the negative electrode tab includes a tab body 21 and an extension 22, and the extension 22 of the negative electrode tab contacts the inner wall surface of the battery pack case 200. It is understood that only the negative electrode tab has the extension 22, and the positive electrode tab is not provided with the extension 22.

Further, the extension 22 of one portion of the negative electrode tab may be disposed on the same side of the corresponding tab main body portion 211 as the extension 22 of the other portion of the negative electrode tab. For example, the extension 22 of the negative electrode tab of the one part is correspondingly disposed on the third side of the tab main body 211, and the extension 22 of the negative electrode tab of the other part is disposed on the third side of the tab main body 211. The extension 22 of one part of the negative electrode tab may be provided on a different side of the corresponding tab main body 211 from the extension 22 of the other part of the negative electrode tab. For example, the extension 22 of the negative electrode tab of the one part is correspondingly disposed on the third side of the tab main body 211, and the extension 22 of the negative electrode tab of the other part is disposed on the fourth side and/or the second side of the tab main body 211.

Alternatively, the negative tab may be an extended copper foil.

For example, in other embodiments, the battery cell 100 may be a wound battery cell 100 (not shown), and the tab body 21 includes a tab main body 211 and a fixing portion connected to each other, where the fixing portion and the extending portion 22 are disposed opposite to each other along the height direction of the battery cell 100. Therefore, the device has the advantage of simple structure.

As shown in fig. 5, the extension 22 and the tab body 21 are of a unitary structure. Therefore, the device has the advantage of high installation and production convenience.

The extension 22 may extend 1mm-3mm beyond the outer edge of the cell body 1.

The cell 100 according to the embodiment of the present utility model may extend 1mm-3mm beyond the outer edge of the cell body 1 through the extension 22. The problem that the poor contact with the inner wall surface of the battery pack case 200 is caused by too little extension 22 exceeding the outer edge of the battery cell body 1 can be avoided, and the problem that the assembly interference exists due to too much extension 22 exceeding the outer edge of the battery cell body 1 can be avoided.

For example, the extension 22 may extend 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.3mm, 2.5mm, 2.6mm, 2.8mm, or 3.0mm beyond the outer edge of the cell body 1.

As shown in fig. 1 to 5, a battery pack 1000 according to an embodiment of the present utility model includes the battery cell 100 in any one of the above embodiments. The battery cell 100 is disposed in the battery pack case 200, and the extension 22 contacts the inner wall surface of the battery pack case 200. Therefore, the battery pack 1000 of the embodiment of the utility model has the advantages of improving the heat dissipation rate of the battery cell 100 and prolonging the service life of the battery cell 100.

As shown in fig. 1 and 2, the battery pack case 200 includes a case body 201 and an insulating layer 202, the insulating layer 202 is provided on an inner wall surface of the case body 201, and the extension 22 is in contact with the insulating layer 202.

According to the battery pack 1000 of the embodiment of the utility model, the battery pack shell 200 is divided into the shell body 201 and the insulating layer 202, and the insulating layer 202 can prevent the extension part 22 from discharging through the shell, so that the safety of the battery pack 1000 is improved.

Optionally, an insulating layer 202 is coated or sprayed on the inner wall surface of the case body 201. This has a problem of high work efficiency.

The case body 201 is a metal case. For example, the case body 201 may be a rectangular aluminum case. Thus, the structure has the advantage of high structural strength.

The insulating layer 202 is a thermally conductive insulating layer. This has the advantage of further improving the heat dissipation effect of the battery pack 1000. The plurality of extending portions 22 may or may not be welded together and then are in direct contact with the insulating layer 202, and after the heat is generated inside the battery cell 100, the battery cell 100 is in direct contact with the casing through the extending portions 22 (the negative copper foil) and the heat conductive insulating gel. Therefore, the heat exchange efficiency of the battery cell 100 and the battery pack case 200 can be significantly improved.

The battery pack 1000 also includes a water cooling system (not shown) on the same side of the cell body 1 as the extension 22. It will be appreciated that the extension 22 corresponds to the water cooling system.

According to the battery pack 1000 of the embodiment of the utility model, the water cooling system is arranged, the water cooling system and the extension part 22 are positioned on the same side of the battery cell body 1, and heat on the extension part 22 can be rapidly emitted through the water cooling system. Therefore, the heat dissipation device has the advantages of further improving the heat dissipation rate and prolonging the service life.

Specifically, for example, if the extension 22 may be disposed on the third side, the water cooling system is correspondingly disposed on the third side.

The vehicle of the embodiment of the utility model includes the battery pack 1000 according to any one of the above. Therefore, the vehicle of the embodiment of the utility model has the advantages of improving the heat dissipation rate of the battery cell 100 and prolonging the service life of the battery cell 100.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or in communication with each other, or in interaction with each other, unless explicitly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.

Claims (11)

1. A cell, comprising:

a cell body; and

the electrode lug comprises an electrode lug body and an extension part, wherein the electrode lug body is connected with the battery cell body, the extension part is connected with the electrode lug body, and the extension part is used for being in contact with the inner wall surface of the battery pack shell so as to promote the heat dissipation rate of the battery cell through the extension part.

2. The cell of claim 1, wherein the tab comprises a negative tab comprising the tab body and the extension, the extension of the negative tab being in contact with an inner wall surface of the battery pack housing.

3. The cell of claim 2, wherein the tab comprises a negative tab and a positive tab, each of the negative tab and the positive tab comprising the tab body and the extension, the extension of each of the negative tab and the positive tab being in contact with an inner wall surface of the battery pack case.

4. The battery cell of claim 1, wherein the battery cell is a laminated battery cell comprising a plurality of pole pieces, the plurality of pole lugs are arranged in a one-to-one correspondence, at least one of the plurality of pole lugs has a pole lug body and an extension, the pole lug body comprises a pole lug main body portion and an external connection portion, the pole lug main body portion is connected with the battery cell body, the external connection portion is used for being connected with an external component, the external connection portion is arranged on one side of the pole lug main body, and the extension is arranged on at least one of the other sides of the pole lug main body.

5. The battery cell according to claim 1, wherein the battery cell is a winding battery cell, the tab body comprises a tab main body part and an external connection part, the tab main body part is connected with the battery cell body, the external connection part is used for being connected with an external component, and the external connection part and the extension part are oppositely arranged along the height direction of the battery cell.

6. The cell of claim 1, wherein the extension and the tab body are of unitary construction; and/or the extension exceeds the outer edge of the battery cell body by 1mm-3mm.

7. A battery pack comprising a battery pack case and the cell according to any one of claims 1 to 6, the cell being disposed in the battery pack case, the extension being in contact with an inner wall surface of the battery pack case.

8. The battery pack according to claim 7, wherein the battery pack case includes a case body and an insulating layer provided on an inner wall surface of the case body, the extension portion being in contact with the insulating layer.

9. The battery pack of claim 8, wherein the case body is a metal case; and/or, the insulating layer is a heat conduction insulating layer.

10. The battery pack of claim 7, further comprising a water cooling system, the water cooling system and the extension being located on the same side of the cell body.

11. A vehicle characterized by comprising a battery pack according to any one of claims 7-10.