Battery cell, battery pack and vehicle

Abstract

The embodiment of the utility model provides a battery cell, a battery pack and a vehicle. Wherein the battery cell comprises a shell, a battery cell body, a pole and an insulating heat conduction piece. The shell is provided with a containing cavity, the battery cell body is arranged in the containing cavity, the battery cell body is provided with a pole lug, the pole column is connected with the pole lug, one part of the insulating heat conduction part is connected with the shell, and the other part of the insulating heat conduction part is connected with the pole column. According to the battery cell disclosed by the utility model, the heat at the position can be timely transferred to the shell and dissipated through the shell through the insulating heat conduction piece arranged between the shell and the pole, so that the problem that the temperature in the battery cell body and the temperature at the joint of the pole and the tab are too high is avoided. Therefore, the battery cell is beneficial to improving the heat dissipation capability and prolonging the service life of the battery pack. Therefore, the battery cell provided by the embodiment of the utility model has the advantages of good heat dissipation effect and long service life.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery core and a battery pack and a vehicle having the battery core. Background Art

[0002] The power battery will generate heat during the charging process. The greater the current passing through the battery cell, the greater the heat generated and the higher the risk of thermal runaway. This is especially true for high-power fast-charging power batteries. The battery pack will generate a lot of heat during the charging process because the pole 3 ， With tab 21 ， The heat generation problem at the connection is more serious than other locations, and the heat at this location is often transferred to the battery body 2 ， Internal (e.g. Figure 1 A shown in ， and housing 1 ， (For example, Figure 1 b shown in ， In particular, the heat is transferred to the middle area of ​​the battery body. For example, Figure 1 In the area a shown in the figure, the heat accumulated in the middle of the battery cell body will cause excessive heat inside the battery due to the slow heat dissipation rate. This will affect the fast charging capability and life of the battery pack. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the utility model provides a battery cell. The battery cell has the advantages of good heat dissipation effect, good fast charging capability and long service life.

[0004] An embodiment of the present invention further provides a battery pack.

[0005] An embodiment of the utility model further provides a vehicle.

[0006] The battery cell of the embodiment of the utility model comprises a shell, a battery cell body, a pole and an insulating heat-conducting member.

[0007] The shell has a accommodating cavity, the battery cell body is arranged in the accommodating cavity, the battery cell body has a pole ear, the pole is connected to the pole ear, a part of the insulating heat conductive part is connected to the shell, and another part of the insulating heat conductive part is connected to the pole to transfer the heat of the pole to the shell.

[0008] Because the heat generation problem at the connection between the pole and the pole ear is more serious than other positions, and the heat there is often transferred to the inside of the battery cell body, further causing heat accumulation inside the battery cell body. The battery cell of the embodiment of the utility model, through the insulating heat conductive part connected between the shell and the pole, relies on the insulating heat conductive part to transfer the heat near the pole to the shell in time, and then discharges the heat released during the charging and discharging process of the battery cell body through the shell. The problem of excessive temperature due to heat accumulation inside the battery cell body and at the connection between the pole and the pole ear is avoided. As a result, the battery cell is conducive to improving the fast charging capability and service life of the battery pack.

[0009] Therefore, the battery cell of the embodiment of the utility model has the advantages of good heat dissipation effect, good fast charging capability and long service life.

[0010] In some embodiments, a heat dissipation area is provided on one side of the pole connected to the pole ear, and the portion of the insulating heat conductive member is attached to the heat dissipation area.

[0011] In some embodiments, there are multiple insulating thermal conductive members, which are arranged spaced apart along the circumference of the shell, and a portion of each insulating thermal conductive member is connected to the shell, and another portion of each insulating thermal conductive member is connected to the pole.

[0012] In some embodiments, the battery core further includes a first thermally conductive adhesive layer, and the first thermally conductive adhesive layer is disposed between the portion of the insulating thermally conductive component and the pole.

[0013] In some embodiments, the battery core further includes a second thermally conductive adhesive layer, and the second thermally conductive adhesive layer is disposed between the other portion of the insulating thermally conductive component and the shell.

[0014] In some embodiments, the insulating heat-conducting member is an insulating material member with a thermal conductivity of 0.8-5.0 W / m·K; and / or the insulating heat-conducting member is a sheet-like structure.

[0015] In some embodiments, the thickness of the insulating heat-conducting member is 0.3 mm-2.0 mm; the width of the insulating heat-conducting member is 40 mm-60 mm; and the length of the insulating heat-conducting member is 5 mm-13 mm.

[0016] In some embodiments, the area where the insulating heat conductive member fits the pole is 150 mm 2 -300mm 2 .

[0017] In some embodiments, the area where the insulating heat conductive member fits the housing is 150-300 mm 2 .

[0018] In some embodiments, the shell has an open end that cooperates with the end cover, and the distance between the fitting surface of the shell and the insulating heat conductive component and the open end of the shell is 10 mm-20 mm.

[0019] In some embodiments, the housing has a first heat dissipation surface and a second heat dissipation surface adjacent to each other, the area of ​​the first heat dissipation surface is greater than or equal to the area of ​​the second heat dissipation surface, and the portion of the insulating heat conductive member is connected to the first heat dissipation surface.

[0020] In some embodiments, the battery cell of the present utility model embodiment further includes a cooling element, and the cooling element is arranged on the first heat dissipation surface.

[0021] In some embodiments, the shell body is a heat dissipation metal shell, and the cooling element is a liquid cooling element arranged on the first heat dissipation surface.

[0022] In some embodiments, the insulating heat-conducting member is a thermally conductive silicone sheet.

[0023] In some embodiments, the insulating heat-conducting member includes a heat-conducting sheet and a heat-conducting insulating layer coated on the heat-conducting sheet.

[0024] The battery pack of the embodiment of the utility model may include any of the battery cells described above.

[0025] The vehicle according to the embodiment of the present invention may include the battery pack described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of a battery cell in the related art.

[0027] Figure 2 It is a schematic diagram of the structure of the battery cell of an embodiment of the utility model.

[0028] Figure 3 It is an exploded view of a battery cell according to an embodiment of the utility model.

[0029] Reference numerals:

[0030] Battery cell 100;

[0031] Shell 1; Shell body 11;

[0032] Battery cell body 2; pole ear 21;

[0033] Pole 3; heat dissipation area 31;

[0034] Insulating heat conducting member 4;

[0035] Related technology: Shell 1 ， ; Battery cell body 2 ， ; Tab 21 ，; Pole 3 ， . DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0037] Reference below Figure 2-Figure 3 The battery cell 100, the battery pack and the vehicle according to the embodiment of the present invention are described.

[0038] The battery cell 100 of the embodiment of the utility model comprises a shell 1 , a battery cell body 2 , a pole 3 and an insulating heat-conducting member 4 .

[0039] The shell 1 has a accommodating cavity, the battery cell body 2 is arranged in the accommodating cavity, the battery cell body 2 has a pole ear 21, the pole 3 is connected to the pole ear 21, a part of the insulating heat conductive part 4 is connected to the shell 1, and another part of the insulating heat conductive part 4 is connected to the pole 3 to transfer the heat of the pole 3 to the shell 1.

[0040] The battery cell 100 of the embodiment of the utility model is connected between the shell 1 and the pole 3 by the insulating heat-conducting member 4, and the heat near the pole 3 is timely transferred to the shell 1 by the insulating heat-conducting member 4, and then the heat is transferred to the shell 1 (for example, Figure 2 b shown in the figure) to discharge the heat released during the charging and discharging process of the battery body 2. Avoid the internal part of the battery body 2 (for example, Figure 2 The problem of over-temperature occurs at the connection between the pole 3 and the pole ear 21 due to heat accumulation. Therefore, the battery cell 100 is conducive to improving the fast charging capability and service life of the battery pack.

[0041] Therefore, the battery cell 100 of the embodiment of the utility model has the advantages of good heat dissipation effect, good fast charging capability and long service life.

[0042] Optionally, the battery cell body may be one of a wound core and a laminated core. Figure 2 As shown in , the battery cell body is a winding core.

[0043] like Figure 2 and Figure 3 As shown, the pole 3 is connected to one side of the pole ear 21 (for example, Figure 2The lower surface shown in FIG. 2 is provided with a heat dissipation area 31, and a part of the insulating heat conductive member 4 is attached to the heat dissipation area 31. Because the heat generation problem at the connection between the pole 3 and the pole ear 21 is more serious than that at other positions, the insulating heat conductive member 4 is arranged close to the heat dissipation area 31 of the pole 3, so that the accumulated heat can be dissipated more promptly. As a result, the heat dissipation efficiency at this location is further improved. Furthermore, the battery cell 100 of the embodiment of the utility model has the advantage of further improving the fast charging capability and service life.

[0044] like Figure 2 and Figure 3 As shown, there are multiple insulating heat-conducting members 4, and the multiple insulating heat-conducting members 4 are arranged at intervals along the circumference of the housing 1, and a part of each insulating heat-conducting member 4 is connected to the housing 1, and the other part of each insulating heat-conducting member 4 is connected to the pole 3. In other words, the multiple insulating heat-conducting members 4 are connected between the housing 1 and the pole 3 at intervals. Since multiple insulating heat-conducting members 4 are provided, the heat dissipation area can be increased, which helps to improve the heat dissipation effect of the pole 3.

[0045] For example, there are two insulating heat-conducting members 4, and each pole 3 and the housing 1 can be arranged opposite to each other along the circumference of the housing 1 (for example, Figure 3 The insulating heat-conducting member 4 (in the front-to-back direction as shown in FIG) dissipates heat.

[0046] The battery cell 100 of the embodiment of the utility model further includes a first thermally conductive adhesive layer, which is disposed between a portion of the insulating thermally conductive member 4 and the pole 3. It can be understood that a portion of the insulating thermally conductive member 4 is bonded to the pole 3 by the thermally conductive adhesive.

[0047] The battery cell 100 of the embodiment of the utility model not only has the advantages of good structural stability and high processing convenience by bonding a part of the insulating heat conductive member 4 to the pole 3 by setting a heat conductive adhesive, but also further improves the heat conduction effect of the bonding point. Therefore, the battery cell 100 not only improves the heat dissipation effect, but also improves the structural stability and processing convenience of the battery cell 100.

[0048] The battery cell 100 of the embodiment of the utility model further includes a second thermally conductive adhesive layer, which is disposed between the other part of the insulating thermally conductive member 4 and the housing 1. It can be understood that the other part of the insulating thermally conductive member 4 is bonded to the inner shell wall of the housing 1 by the thermally conductive adhesive. Similarly, the battery cell 100 has the advantages of good heat dissipation effect, good structural stability and easy processing.

[0049] The insulating heat-conducting member 4 is an insulating material member with a thermal conductivity of 0.8-5.0 W / m·K. Therefore, the insulating heat-conducting member 4 has the advantage of good heat conduction effect.

[0050] Exemplarily, the thermal conductivity of the insulating thermal conductive component 4 can be 0.8 W / m·K, 1.0 W / m·K, 1.5 W / m·K, 2.0 W / m·K, 2.5 W / m·K, 3.0 W / m·K, 3.5 W / m·K, 4.0 W / m·K, 4.5 W / m·K, or 5.0 W / m·K.

[0051] The insulating heat-conducting member 4 is a sheet-like structure because the insulating heat-conducting member 4 with a sheet-like structure has the advantage of a large heat-conducting area, which helps to further improve the heat dissipation capacity of the area.

[0052] Optionally, the insulating heat-conducting member 4 is a flexible heat-conducting sheet. For example, the insulating heat-conducting member 4 is an insulating heat-conducting silicone sheet. Thus, most of the heat can be quickly transferred to the housing 1, and the temperature transferred to the internal position of the battery body 2 can also be reduced, solving the problem of heat accumulation when charging a large current battery 100 (for example, a fast-charging lithium-ion battery), thereby further improving the service life of the battery pack.

[0053] The thickness of the insulating heat-conducting member 4 is 0.3 mm to 2.0 mm. Therefore, the battery cell 100 of the embodiment of the utility model avoids the waste of insulating heat-conducting materials caused by the insulating heat-conducting member 4 being too thick, and also avoids the problem of low structural strength and poor heat dissipation effect caused by the insulating heat-conducting member 4 being too thin. Therefore, the battery cell 100 has the advantages of low processing cost and good heat dissipation effect.

[0054] Exemplarily, the thickness of the insulating heat conductive member 4 is 0.3 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.3 mm, 1.5 mm, 1.8 mm and 2.0 mm.

[0055] The width of the insulating heat conductive member 4 is 40 mm to 60 mm. Therefore, the battery cell 100 of the embodiment of the utility model avoids the waste of insulating heat conductive materials caused by the insulating heat conductive member 4 being too wide, and also avoids the problem of poor heat dissipation effect caused by the insulating heat conductive member 4 being too small. Therefore, the battery cell 100 has the advantages of low processing cost and good heat dissipation effect.

[0056] Exemplarily, the width of the insulating heat conductive member 4 is 40 mm, 42 mm, 45 mm, 48 mm, 50 mm, 52 mm, 55 mm, 58 mm and 60 mm.

[0057] The length of the insulating heat conductive member 4 is 5 mm to 13 mm. Thus, the waste of insulating heat conductive materials caused by the insulating heat conductive member 4 being too long is avoided, and the problem of small heat conductive surface and poor installation convenience caused by the insulating heat conductive member 4 being too short is also avoided. Therefore, the battery cell 100 has the advantages of low processing cost and good heat dissipation effect.

[0058] Exemplarily, the lengths of the insulating heat conductive member 4 are 5.0 mm, 5.2 mm, 5.5 mm, 5.8 mm, 6.0 mm, 7.0 mm, 8.0 mm, 9.0 mm, 10.0 mm, 11.0 mm, 12.0 mm, 12.5 mm and 13 mm.

[0059] The area where the insulating heat-conducting member 4 and the pole 3 fit together is 150mm 2 -300mm 2 Therefore, the battery cell 100 of the embodiment of the utility model avoids the problem of interference with the installation of the pole ear 21 caused by the insulating heat conductive member 4 and the pole 3 being too large, and further avoids the problem of poor heat dissipation effect caused by the insulating heat conductive member 4 and the pole 3 being too small. Therefore, the battery cell 100 has the advantages of high installation convenience and good heat dissipation effect.

[0060] The area where the insulating heat-conducting member 4 fits the housing 1 is 150-300 mm 2 Similarly, the battery cell 100 has the advantages of high installation convenience and good heat dissipation effect.

[0061] For example, the area where the insulating heat-conducting member 4 fits the housing 1 is 150 mm 2 、170mm 2 、190mm 2 , 210mm 2 , 230mm 2 , 250mm 2 、270mm 2 、290mm 2 and 300mm 2 .

[0062] For example, Figure 2 and Figure 3 As shown, the housing 1 has an open end that matches the end cover, and the contact surface between the housing 1 and the insulating heat-conducting member 4 is 0.1 m from the open end of the housing 1 ( Figure 2 The distance between the housing 1 and the insulating heat-conducting member 4 and the upper end thereof is 10 mm to 20 mm. This avoids the problem of waste of insulating heat-conducting materials caused by the distance between the fitting surface of the housing 1 and the insulating heat-conducting member 4 and the side of the mating end cap being too large, and further avoids the problem of poor heat dissipation effect caused by the distance being too small. As a result, the battery cell 100 has the advantages of high installation convenience and good heat dissipation effect.

[0063] Furthermore, the fitting surface between the insulating heat-conducting member 4 and the shell 1 is in a strip shape, and the fitting surface and the inner wall of the aluminum shell can be connected in a straight line.

[0064] Specifically, the distance between the portion of the insulating heat-conducting member 4 and the end of the housing 1 where the end cap is installed is 10mm-20mm. For example, the end cap is arranged at one end of the housing 1, the pole 3 is arranged on the end cap, and the distance between the fitting surface of the housing 1 and the insulating heat-conducting member 4 and the side of the mating end cap is 10mm-20mm. Exemplarily, the distance between the fitting surface of the housing 1 and the insulating heat-conducting member 4 and the side of the mating end cap can be 10mm, 12mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm and 20mm.

[0065] like Figure 2 and Figure 3 As shown, the shell 1 includes a shell body 11, which has a first heat dissipation surface and a second heat dissipation surface adjacent to each other. The area of ​​the first heat dissipation surface is greater than or equal to the area of ​​the second heat dissipation surface, and a part of the insulating heat conductive member 4 is connected to the first heat dissipation surface.

[0066] The battery core 100 of the embodiment of the utility model can improve the heat dissipation effect by connecting a part of the insulating heat-conducting member 4 to the first heat dissipation surface (larger surface).

[0067] The battery cell 100 of the embodiment of the utility model further includes a cooling member (not shown), which is disposed on the first heat dissipation surface. The battery cell 100 of the embodiment of the utility model improves the first heat dissipation surface and the heat dissipation effect by the cooling member. Therefore, the battery cell 100 has the advantage of good heat dissipation effect.

[0068] Furthermore, the shell body 11 is a heat dissipation metal shell, and the cooling element can be a liquid cooling element arranged on the first heat dissipation surface. Because the cooling element is arranged on the first heat dissipation surface (larger heat dissipation surface) of the heat dissipation metal shell, it is helpful to dissipate the heat accumulated on the shell body 11 in time through the cooling element, thereby avoiding the accumulation of heat at the pole ear 21 and the pole 3. Thus, the heat dissipation effect is further improved. For example, the shell body 11 can be a copper shell, an iron shell, an aluminum shell, a stainless steel shell, an aluminum alloy shell, etc.

[0069] The insulating heat-conducting member 4 is a heat-conducting silicone sheet. Since the heat-conducting silicone sheet is generally a universal heat-conducting pad, the thermal resistance is relatively small and the cost is low. Therefore, the battery cell 100 of the embodiment of the utility model has the advantages of good heat dissipation effect and low cost.

[0070] The embodiments of the present invention are not limited thereto. For example, in other embodiments, the insulating heat-conducting member 4 includes a heat-conducting sheet and a heat-conducting insulating layer coated on the heat-conducting sheet.

[0071] The battery pack according to the embodiment of the present invention may include a housing 1 and a battery cell 100 according to any one of the above items.

[0072] Therefore, the battery pack of the embodiment of the utility model has the advantages of good heat dissipation effect and long service life.

[0073] The vehicle of the embodiment of the utility model comprises the battery pack described above. Therefore, the vehicle of the embodiment of the utility model has the advantages of good heat dissipation effect and long service life.

[0074] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0075] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0076] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0078] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0079] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A battery cell, characterized in that: include: A housing having a receiving cavity; A battery cell body, the battery cell body is arranged in the accommodating cavity, and the battery cell body has a pole ear; A pole, the pole being connected to the pole lug; and, An insulating heat-conducting member, a portion of which is connected to the shell, and another portion of which is connected to the pole.

2. The battery cell according to claim 1, characterized in that: A heat dissipation area is provided on one side of the pole connected to the pole ear, and the part of the insulating heat conductive member is attached to the heat dissipation area; And / or, there are multiple insulating heat-conducting parts, and the multiple insulating heat-conducting parts are arranged at intervals along the circumference of the shell, and a part of each of the insulating heat-conducting parts is connected to the shell, and another part of each of the insulating heat-conducting parts is connected to the pole.

3. The battery cell according to claim 1, characterized in that: It also includes a first thermally conductive adhesive layer, which is arranged between the portion of the insulating thermally conductive member and the pole; And / or, further comprising a second thermally conductive adhesive layer, wherein the second thermally conductive adhesive layer is arranged between the other part of the insulating thermally conductive component and the shell.

4. The battery cell according to claim 1, characterized in that: The insulating heat-conducting member is an insulating material member with a thermal conductivity of 0.8-5.0 W / m·K; And / or, the insulating heat-conducting member is a sheet-like structure; And / or, the thickness of the insulating heat-conducting member is 0.3 mm-2.0 mm; the width of the insulating heat-conducting member is 40 mm-60 mm; the length of the insulating heat-conducting member is 5 mm-13 mm.

5. The battery cell according to claim 1, characterized in that: The area where the insulating heat-conducting part and the pole are attached is 150mm 2 -300mm 2 ; And / or, the area where the insulating heat-conducting member fits the housing is 150-300 mm 2 ; And / or, the shell has an open end that cooperates with the end cover, and the distance between the fitting surface of the shell and the insulating heat-conducting member and the open end of the shell is 10 mm-20 mm.

6. The battery cell according to claim 1, characterized in that: The housing has a first heat dissipation surface and a second heat dissipation surface adjacent to each other, the area of ​​the first heat dissipation surface is greater than or equal to the area of ​​the second heat dissipation surface, and the portion of the insulating heat conductive member is connected to the first heat dissipation surface.

7. The battery cell according to claim 6, characterized in that: It also includes a cooling element, which is arranged on the first heat dissipation surface.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The insulating heat-conducting component is a heat-conducting silicone sheet; or, the insulating heat-conducting component includes a heat-conducting sheet and a heat-conducting insulating layer coated on the heat-conducting sheet.

9. A battery pack, characterized in that: Comprising a battery cell according to any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising a battery pack according to claim 9.

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