Battery and electric equipment

Abstract

The utility model provides a battery and electric equipment. The battery comprises at least two core packs, each core pack is provided with a positive electrode tab and a negative electrode tab, the positive electrode tabs of the at least two core packs are located on different sides of the battery, and / or the negative electrode tabs of the at least two core packs are located on different sides of the battery. According to the battery disclosed by the invention, the problem of concentration of the welding area is effectively avoided, too high temperature rise of the welding area of the battery can be effectively avoided, and meanwhile, the heating area of the battery is also divided into at least two areas, so that the temperature uniformity of the battery is improved, the situation that the local temperature of the battery is too high can be avoided, and the cycle service life of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery and an electric device. BACKGROUND

[0002] Batteries are widely used in energy storage systems, vehicles, consumer electronics and other fields. When a battery includes multiple cell packs, the tab welding of multiple battery cell packs is a key step in the assembly process of the battery pack. This usually occurs in the production stage of the battery module or battery pack, especially for high-capacity battery packs (such as for electric vehicles, energy storage systems, etc.). This welding needs to ensure that the electrical connection between each battery cell is stable, reliable and safe.

[0003] In the related art, the tab welding area of the battery has a high temperature rise, which causes the local temperature of the battery to be too high. UTILITY MODEL CONTENT

[0004] Embodiments of the present application provide a battery and an electric device, which can improve the technical problem of high temperature rise in the tab welding area of the battery.

[0005] In a first aspect, embodiments of the present application provide a battery, comprising:

[0006] at least two cell packs, each of the cell packs being provided with a positive tab and a negative tab;

[0007] wherein the positive tabs of the at least two cell packs are located on different sides of the battery, and / or the negative tabs of the at least two cell packs are located on different sides of the battery.

[0008] In an embodiment, the positive tab and the negative tab of at least one of the cell packs are located on different sides of the battery; and / or the positive tab of at least one of the cell packs and the negative tab of another of the cell packs are located on different sides of the battery.

[0009] In an embodiment, the positive tabs of different cell packs are located on different sides of the battery; and / or the negative tabs of different cell packs are located on different sides of the battery.

[0010] In an embodiment, the at least two cell packs include a first cell pack and a second cell pack, the first cell pack includes a first connecting surface, the positive tab of the first cell pack and the negative tab of the first cell pack are both arranged on the first connecting surface,

[0011] the second cell pack includes oppositely arranged second and third connecting surfaces, the positive tab of the second cell pack is arranged on the second connecting surface, the negative tab of the second cell pack is arranged on the third connecting surface, and the first connecting surface and the second connecting surface are perpendicular to each other.

[0012] In an embodiment, the radial length of the positive electrode tab of the second core pack is L1, the distance between the positive electrode tab of the second core pack and the first connecting surface along the radial direction of the positive electrode tab of the second core pack is L2, and the width of the second connecting surface is L3, wherein L1+L2=L4, and the ratio of L4 to L3 is between 0.2 and 0.6.

[0013] In an embodiment, the battery comprises a connecting plate, and the connecting plate is electrically connected to different core packs.

[0014] In an embodiment, the connecting plate comprises a body and a pin, and the pin is connected to the body, and the positive electrode tab and the negative electrode tab of part of the core packs are connected to the body, and the positive electrode tab and the negative electrode tab of part of the core packs are connected to the pin.

[0015] In an embodiment, the at least two core packs comprise a first core pack and a second core pack, the pin comprises a first pin and a second pin, the positive electrode tab and the negative electrode tab of the first core pack are connected to the body, the first pin is connected to the positive electrode tab of the second core pack, and the second pin is connected to the negative electrode tab of the second core pack.

[0016] In an embodiment, the first pin is embedded in the positive electrode tab of the second core pack, and / or the second pin is embedded in the negative electrode tab of the second core pack; the positive electrode tab of the second core pack is formed with a first connecting hole, and the first pin is inserted into the first connecting hole; and / or the negative electrode tab of the second core pack is formed with a second connecting hole, and the second pin is inserted into the second connecting hole.

[0017] In a second aspect, embodiments of the present application provide a power-using device comprising the battery described above.

[0018] The embodiments of the present application have the following beneficial effects:

[0019] In the embodiments of the present application, by arranging the positive electrode tabs of the at least two core packs on different sides, and also arranging the negative electrode tabs of the at least two core packs on different sides, when welding the electrode tabs of different core packs, there are at least two welding areas, and the at least two welding areas are located on different sides of the battery, effectively avoiding the problem of concentrated welding areas, effectively avoiding the problem of excessively high temperature rise of the welding area of the battery, and also dividing the heating area of the battery into at least two, improving the temperature uniformity of the battery, avoiding the problem of excessively high local temperature of the battery, and being beneficial to increasing the cycle service life of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0021] Figure 1 is a structural schematic diagram of a battery provided by an embodiment of the present application;

[0022] Figure 2 is a structural schematic diagram of a first core pack provided by an embodiment of the present application;

[0023] Figure 3 is one of structural schematic diagrams of a second core pack provided by an embodiment of the present application;

[0024] Figure 4 is a partial structural schematic diagram of a battery provided by an embodiment of the present application;

[0025] Figure 5 is another structural schematic diagram of a second core pack provided by an embodiment of the present application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments only constitute some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as “upper” and “lower” generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and “inner” and “outer” refer to the contour of the device.

[0027] The battery and the electric device of the present application will be described below in combination with Figures 1 to 5

[0028] According to the embodiments of the first aspect of the present application, the battery comprises at least two core packs 1, each core pack 1 is provided with a positive electrode tab 11 and a negative electrode tab 12. Figure 1 Figure 4 The positive electrode tabs 11 of the at least two core packs 1 are located at different sides of the battery, and / or the negative electrode tabs 12 of the at least two core packs 1 are located at different sides of the battery.

[0029] The positive electrode tabs 11 of the at least two core packs 1 are located at different sides of the battery, and / or the negative electrode tabs 12 of the at least two core packs 1 are located at different sides of the battery.

[0030] ​​According to the battery of the embodiment of the present application, by arranging the positive electrode tabs 11 of the at least two core packs 1 on different sides, and arranging the negative electrode tabs 12 of the at least two core packs 1 on different sides, when welding the tabs of different core packs 1, there are at least two welding areas, the at least two welding areas are located on different sides of the battery, which effectively avoids the problem of concentrated welding areas, can effectively avoid the temperature rise of the welding area of the battery being too high, at the same time, the heating area of the battery is also divided into at least two, which improves the temperature uniformity of the battery, can avoid the situation that the local temperature of the battery is too high, and is beneficial to increasing the cycle life of the battery.

[0031] It can be understood that in the related art, the positive electrode tabs and the negative electrode tabs of the battery are concentrated on the same side, when welding the tabs of different core packs 1, the welding areas are concentrated on the same side, and in the working process of the battery, the welding areas will heat, which is easy to cause the temperature rise of the welding area of the tabs of the battery being too high, especially when the rate of the battery is high and the charging and discharging speed is fast, which causes the local temperature of the battery to be too high, and shortens the cycle life of the battery.

[0032] The present application arranges the tabs of different core packs 1 on different sides of the battery, so that when welding the tabs of different core packs 1, there are at least two welding areas, which avoids the concentration of welding areas. When the battery works, the at least two welding areas can simultaneously dissipate heat, effectively preventing the temperature rise of the welding area being too high, improving the heat dissipation efficiency of the battery, avoiding the local temperature of the battery being too high, improving the temperature uniformity of the battery, and increasing the cycle life of the battery. That is, the structural design of the present application enables the battery to improve the rate without the temperature rise being too high, so that the battery can be used as a fast-charging battery.

[0033] In some examples, the positive electrode tabs 11 of the at least two core packs 1 are located on different sides of the battery, which means that the extension directions of the positive electrode tabs 11 of the at least two core packs 1 are different. The negative electrode tabs 12 of the at least two core packs 1 are located on different sides of the battery, which means that the extension directions of the negative electrode tabs 12 of the at least two core packs 1 are different.

[0034] In some examples, the positive electrode tabs 11 of the at least two core packs 1 are located on different sides of the battery, which means that the positive electrode tabs 11 of all the core packs 1 can be located on different sides of the battery, or the positive electrode tabs 11 of part of the core packs 1 can be located on different sides of the battery.

[0035] In some examples, the negative electrode tabs 12 of the at least two core packs 1 are located on different sides of the battery, which means that the negative electrode tabs 12 of all the core packs 1 can be located on different sides of the battery, or the negative electrode tabs 12 of part of the core packs 1 can be located on different sides of the battery.

[0036] In some examples, the positive and negative tabs 11 and 12 of different core packs 1 can be located on the same side or on different sides. For example, at least two core packs 1 include a first core pack 13 and a second core pack 14, and the positive tab 11 of the first core pack 13 and the negative tab 12 of the second core pack 14 can be located on different sides of the battery or on the same side of the battery.

[0037] For example, the positive tabs 11 of at least two core packs 1 are located on different sides of the battery, and specifically, the positive tabs 11 of some core packs 1 are located on the upper side of the battery, and the positive tabs 11 of some core packs 1 are located on the left or right side of the battery. The negative tabs 12 of at least two core packs 1 are located on different sides of the battery, and specifically, the negative tabs 12 of some core packs 1 are located on the upper side of the battery, and the negative tabs 12 of some core packs 1 are located on the left or right side of the battery.

[0038] In some embodiments, the positive and negative tabs 11 and 12 of at least one core pack 1 are located on different sides of the battery.

[0039] It can be understood that by locating the positive and negative tabs 11 and 12 of at least one core pack 1 on different sides of the battery, i.e., the positive and negative tabs 11 and 12 of the core pack 1 are located on different sides of the core pack 1, when welding the tabs of the core pack 1 to the tabs of other core packs 1, the welding positions of the positive and negative tabs 11 and 12 of the core pack 1 are located on different sides, so that there are at least two welding areas in the battery, thereby avoiding the problem of concentrated welding areas, effectively avoiding excessive temperature rise of the welding areas of the battery, and at the same time, the heating areas of the battery are also divided into at least two, improving the temperature uniformity of the battery, avoiding the occurrence of excessive local temperature of the battery, and being beneficial to increasing the cycle life of the battery.

[0040] In some embodiments, the positive tab 11 of at least one core pack 1 and the negative tab 12 of another core pack 1 are located on different sides of the battery.

[0041] It can be understood that by locating the positive tabs 11 of some core packs 1 and the negative tabs 12 of some core packs 1 on different sides of the battery, when welding the tabs of different core packs 1, the welding positions of the positive tabs 11 of some core packs 1 and the welding positions of the negative tabs 12 of some core packs 1 are located on different sides, so that there are at least two welding areas in the battery, thereby avoiding the problem of concentrated welding areas, effectively avoiding excessive temperature rise of the welding areas of the battery, and at the same time, the heating areas of the battery are also divided into at least two, improving the temperature uniformity of the battery, avoiding the occurrence of excessive local temperature of the battery, and being beneficial to increasing the cycle life of the battery.

[0042] Exemplarily, the at least two core packs 1 include a first core pack 13 and a second core pack 14, and the positive electrode tab 11 of the first core pack 13 and the positive electrode tab 11 of the second core pack 14 are located on different sides of the battery.

[0043] In some embodiments, the positive electrode tabs 11 of different core packs 1 are located on different sides of the battery.

[0044] It can be understood that, by arranging the positive electrode tabs 11 of different core packs 1 on different sides, the welding positions of the positive electrode tabs 11 of different core packs 1 are located on different sides when welding the tabs of different core packs 1, so that the battery has at least two welding areas, thereby avoiding the problem of concentrated welding areas, effectively avoiding the temperature rise of the welding areas of the battery being too high, and at the same time, the heating areas of the battery are also divided into at least two, improving the temperature uniformity of the battery, which can avoid the situation of the local temperature of the battery being too high, and is beneficial to increasing the cycle life of the battery.

[0045] Exemplarily, the at least two core packs 1 include a first core pack 13 and a second core pack 14, and the positive electrode tab 11 of the first core pack 13 and the positive electrode tab 11 of the second core pack 14 are located on different sides of the battery.

[0046] In some embodiments, the negative electrode tabs 12 of different core packs 1 are located on different sides of the battery.

[0047] It can be understood that, by arranging the negative electrode tabs 12 of different core packs 1 on different sides, the welding positions of the negative electrode tabs 12 of different core packs 1 are located on different sides when welding the tabs of different core packs 1, so that the battery has at least two welding areas, thereby avoiding the problem of concentrated welding areas, effectively avoiding the temperature rise of the welding areas of the battery being too high, and at the same time, the heating areas of the battery are also divided into at least two, improving the temperature uniformity of the battery, which can avoid the situation of the local temperature of the battery being too high, and is beneficial to increasing the cycle life of the battery.

[0048] Exemplarily, the at least two core packs 1 include a first core pack 13 and a second core pack 14, and the negative electrode tab 12 of the first core pack 13 and the negative electrode tab 12 of the second core pack 14 are located on different sides of the battery.

[0049] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 3 , the at least two core packs 1 include a first core pack 13 and a second core pack 14, the first core pack 13 includes a first connecting surface 131, and the positive electrode tab 11 of the first core pack 13 and the negative electrode tab 12 of the first core pack 13 are both arranged on the first connecting surface 131,

[0050] The second core pack 14 comprises a second connecting surface 141 and a third connecting surface 142 arranged oppositely, the positive electrode tab 11 of the second core pack 14 is arranged on the second connecting surface 141, and the negative electrode tab 12 of the second core pack 14 is arranged on the third connecting surface 142, and the first connecting surface 131 and the second connecting surface 141 are perpendicular to each other.

[0051] It can be understood that the positive electrode tab 11 of the second core pack 14 is located on the second connecting surface 141, and the second connecting surface 141 is perpendicular to the first connecting surface 131, so that the positive electrode tab 11 of the second core pack 14 and the tab of the first core pack 13 are located on different sides; the negative electrode tab 12 of the second core pack 14 is located on the third connecting surface 142, and the third connecting surface 142 is perpendicular to the first connecting surface 131, so that the negative electrode tab 12 of the second core pack 14 and the tab of the first core pack 13 are located on different sides; at the same time, since the second connecting surface 141 and the third connecting surface 142 are arranged oppositely, the positive electrode tab 11 and the negative electrode tab 12 of the second core pack 14 are also located on different sides. Further, the battery has multiple tab welding areas, avoiding the problem of concentrated welding areas, effectively avoiding the temperature rise of the welding area of the battery being too high, and at the same time, the heating area of the battery is also divided into at least two, improving the temperature uniformity of the battery, which can avoid the situation that the local temperature of the battery is too high, and is beneficial to increase the cycle service life of the battery.

[0052] In some embodiments, as Figure 3 and Figure 5 , the radial length of the positive electrode tab 11 of the second core pack 14 is L1, the distance between the positive electrode tab 11 of the second core pack 14 and the first connecting surface 131 along the radial direction of the positive electrode tab 11 of the second core pack 14 is L2, and the width of the second connecting surface 141 is L3, wherein L1+L2=L4, and the ratio of L4 to L3 is between 0.2 and 0.6.

[0053] It can be understood that if the ratio of L4 to L3 is less than 0.2, it means that the distance between the positive electrode tab 11 of the second core pack 14 and the first connecting surface 131 is close, and the distance between the tab welding area at the first connecting surface 131 and the welding area of the positive electrode tab 11 of the second core pack 14 is close, which is not conducive to heat dissipation of the battery; if the ratio of L4 to L3 is greater than 0.6, it means that the distance between the positive electrode tab 11 of the second core pack 14 and the first connecting surface 131 is far, which is not convenient for connecting the tab of the first core pack 13 and the positive electrode tab 11 of the second core pack 14. Therefore, the ratio of L4 to L3 is set to be between 0.2 and 0.6 in the present application, so as to ensure the spacing between the tab welding area at the first connecting surface 131 and the welding area of the positive electrode tab 11 of the second core pack 14, avoid the situation that the temperature of the battery is too high, and also ensure the convenience of connecting the tab of the first core pack 13 and the positive electrode tab 11 of the second core pack 14.

[0054] In some examples, when the positive electrode tab 11 of the second core pack 14 is in a cylindrical structure, L1 is the diameter of the positive electrode tab 11 of the second core pack 14.

[0055] In some embodiments, the battery comprises a connecting plate 2, the connecting plate 2 electrically connecting the different core packs 1.

[0056] It can be understood that the tabs of the different core packs 1 are electrically connected by the connecting plate 2 to connect the different core packs 1 together to form the battery.

[0057] For example, the positive electrode tab 11 and the negative electrode tab 12 of the core pack 1 are both welded to the connecting plate 2.

[0058] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 3 , the connecting plate 2 comprises a body 21 and a pin 22, the pin 22 is connected to the body 21, part of the positive electrode tab 11 and the negative electrode tab 12 of the core pack 1 are connected to the body 21, and part of the positive electrode tab 11 and the negative electrode tab 12 of the core pack 1 are connected to the pin 22, thereby achieving the connection of the tabs of the different core packs 1.

[0059] In some embodiments, the at least two core packs 1 comprise a first core pack 13 and a second core pack 14, the pin 22 comprises a first pin 221 and a second pin 222, the positive electrode tab 11 and the negative electrode tab 12 of the first core pack 13 are both connected to the body 21, the first pin 221 is connected to the positive electrode tab 11 of the second core pack 14, and the second pin 222 is connected to the negative electrode tab 12 of the second core pack 14.

[0060] It can be understood that the positive electrode tab 11 of the second core pack 14 is connected to the body 21 by the first pin 221, and the negative electrode tab 12 of the second core pack 14 is connected to the body 21 by the second pin 222, thereby achieving the connection of the first core pack 13 and the second core pack 14.

[0061] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 3 , the first pin 221 is embedded in the positive electrode tab 11 of the second core pack 14, and / or the second pin 222 is embedded in the negative electrode tab 12 of the second core pack 14.

[0062] It can be understood that the first pin 221 is embedded in the positive electrode tab 11 of the second core pack 14, which improves the connection stability of the first pin 221 and the positive electrode tab 11 of the second core pack 14. The second pin 222 is embedded in the negative electrode tab 12 of the second core pack 14, which can improve the connection stability of the second pin 222 and the negative electrode tab 12 of the second core pack 14.

[0063] In some embodiments, the positive electrode tab 11 of the second core pack 14 is formed with a first connecting hole, and the first pin 221 is inserted into the first connecting hole; and / or, the negative electrode tab 12 of the second core pack 14 is formed with a second connecting hole, and the second pin 222 is inserted into the second connecting hole, thereby improving the connection stability of the first pin 221 and the positive electrode tab 11 of the second core pack 14, and improving the connection stability of the second pin 222 and the negative electrode tab 12 of the second core pack 14.

[0064] According to the embodiments of the second aspect of the present application, the electric device includes the above-mentioned battery.

[0065] According to the electric device of the embodiments of the present application, by arranging the positive electrode tabs 11 of the at least two core packs 1 on different sides, and also arranging the negative electrode tabs 12 of the at least two core packs 1 on different sides, when welding the tabs of different core packs 1, there will be at least two welding areas, and the at least two welding areas are located on different sides of the battery, effectively avoiding the problem of concentrated welding areas, and effectively avoiding the problem of excessively high temperature rise of the welding areas of the battery, thereby improving the use safety of the electric device. At the same time, the heating areas of the battery are also divided into at least two, thereby improving the temperature uniformity of the battery, avoiding the problem of excessively high local temperature of the battery, and being beneficial to increasing the cycle life of the battery.

[0066] It should be noted that the electric device can be a vehicle, an aircraft, or a household appliance. It should be noted that the foregoing is only an example of the electric device, and does not specially limit the electric device.

[0067] The embodiments of the present application are described in detail above, and the specific examples are applied to the principles and implementation modes of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description of the embodiments should not be understood as a limitation of the present application.

Claims

1. A battery, characterized by, The battery comprises: at least two core packs, each of which is provided with a positive electrode tab and a negative electrode tab; wherein the positive electrode tabs of at least two of the core packs are located on different sides of the battery, and / or the negative electrode tabs of at least two of the core packs are located on different sides of the battery.

2. The battery of claim 1, wherein, The positive electrode tab and the negative electrode tab of at least one of the core packs are located on different sides of the battery; and / or the positive electrode tab of at least one of the core packs is located on a different side of the battery from the negative electrode tab of another core pack.

3. The battery of claim 1, wherein, The positive electrode tabs of different core packs are located on different sides of the battery; and / or the negative electrode tabs of different core packs are located on different sides of the battery.

4. The battery according to any one of claims 1 to 3, characterized in that, The at least two core packs comprise a first core pack and a second core pack, the first core pack comprises a first connecting surface, the positive electrode tab of the first core pack and the negative electrode tab of the first core pack are both arranged on the first connecting surface, the second core pack comprises oppositely arranged second and third connecting surfaces, the positive electrode tab of the second core pack is arranged on the second connecting surface, and the negative electrode tab of the second core pack is arranged on the third connecting surface, and the first connecting surface is perpendicular to the second connecting surface.

5. The battery of claim 4, wherein, The radial length of the positive electrode tab of the second core pack is L1, the distance between the positive electrode tab of the second core pack and the first connecting surface along the radial direction of the positive electrode tab of the second core pack is L2, and the width of the second connecting surface is L3, wherein L1+L2=L4, and the ratio of L4 to L3 is between 0.2 and 0.

6.

6. The battery according to any one of claims 1 to 3, characterized in that, The battery comprises a connecting plate electrically connected to different core packs.

7. The battery of claim 6, wherein, The connecting plate comprises a body and a pin, the pin is connected to the body, and the positive electrode tabs and the negative electrode tabs of some of the core packs are both connected to the body, and the positive electrode tabs and the negative electrode tabs of some of the core packs are both connected to the pin.

8. The battery of claim 7, wherein, The at least two core packs comprise a first core pack and a second core pack, the pin comprises a first pin and a second pin, the positive electrode tab and the negative electrode tab of the first core pack are both connected to the body, the first pin is connected to the positive electrode tab of the second core pack, and the second pin is connected to the negative electrode tab of the second core pack.

9. The battery of claim 8, wherein, The first pin is embedded in the positive electrode tab of the second core pack, and / or the second pin is embedded in the negative electrode tab of the second core pack; the positive electrode tab of the second core pack is formed with a first connecting hole, and the first pin is inserted into the first connecting hole; and / or the negative electrode tab of the second core pack is formed with a second connecting hole, and the second pin is inserted into the second connecting hole.

10. An electric device, characterized by The battery comprises the battery as claimed in any one of claims 1 to 9.

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