Battery

Abstract

The utility model discloses a battery, and relates to the technical field of batteries. The battery comprises a shell which is provided with a cavity and an opening communicated with the cavity; the side end cover is arranged on the opening; the pole is arranged on the side end cover; the pole core is arranged in the cavity; wherein the inner bottom surface of the shell is provided with a first supporting part, and the first supporting part is used for supporting the pole core, so that the bottom surface of the pole core is supported, the stress area of the pole core is increased, the pole core on the non-tab side is prevented from inclining due to the gravity of the pole core, the performance of the battery is improved, and the tearing risk of the tab is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery. BACKGROUND

[0002] The battery includes a shell and a pole core arranged in the shell, and the battery includes the pole core and a tab connected with the pole core. When the battery with the same side tab is placed vertically, the tab side of the pole core is connected with the pole core and the end cover, while the non-tab side of the pole core is not connected with the pole core and the bottom of the shell. This will cause the non-tab side of the pole core to tilt and move down under the influence of its own gravity, and the pole core on the non-tab side is in contact with the shell to generate a large force, which affects the performance of the battery.

[0003] In addition, when the battery with the same side tab is placed vertically, the non-tab side of the pole core will move down under the action of gravity without being constrained by external force, and will pull the tab side of the pole core, thereby causing the tab to easily tear. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a battery to solve the technical problem that the non-tab side of the pole core moves down under the influence of its own gravity when the battery is placed vertically, which affects the performance of the pole core, and even pulls the tab side of the pole core, causing the tab to easily tear.

[0005] To achieve the above-mentioned purpose, the utility model provides a battery, which comprises a shell with a cavity and an opening communicating with the cavity, a side end cover arranged on the opening, a pole arranged on the side end cover, and a pole core arranged in the cavity, wherein the inner top surface of the shell has a first support part for supporting the pole core.

[0006] In some embodiments, the first support part includes a first support surface, a first connecting surface and a second connecting surface, the first support surface is arranged parallel to the inner bottom surface, the first connecting surface is connected between the first support surface and the inner bottom surface and located on the side close to the pole, and the second connecting surface is connected between the first support surface and the inner bottom surface and located on the side away from the pole.

[0007] In some embodiments, the first connecting surface and the bottom surface of the pole core have a first included angle, and the first included angle is 0°-45°.

[0008] In some embodiments, the inner top surface of the shell has a second support part, and the first support part and the second support part are used for supporting the pole core.

[0009] In some embodiments, the second support part is located on the side away from the pole, and the number of the first support part and the second support part is multiple.

[0010] In some embodiments, the second support portion includes a second support surface, a third connecting surface, and a fourth connecting surface. The second support surface is arranged parallel to the inner top surface. The third connecting surface is connected between the second support surface and the inner top surface and is located on the side closer to the pole post. The fourth connecting surface is connected between the second support surface and the inner top surface and is located on the side farther away from the pole post.

[0011] In some embodiments, a second included angle is formed between the third connecting surface and the top surface of the pole core, the second included angle being 0° to 45°.

[0012] In some embodiments, the housing has an outer bottom surface opposite to the inner bottom surface and an outer top surface opposite to the inner top surface (104). The inner bottom surface protrudes in the direction close to the pole core to form a first support portion, and the outer bottom surface is recessed at the position corresponding to the first support portion. The inner top surface protrudes in the direction close to the pole core to form a second support portion, and the outer top surface is recessed at the position corresponding to the second support portion.

[0013] In some embodiments, the electrode post includes a positive electrode post and a negative electrode post, both of which are disposed on the side end cover.

[0014] The technical advantage of this utility model is that it provides a battery in which the inner bottom surface of the casing has a first support portion, which supports the electrode core, thereby supporting the bottom surface of the electrode core and increasing the force-bearing area of ​​the electrode core, preventing the electrode core on the non-tab side from tilting due to its own weight, thereby improving the performance of the battery and reducing the risk of tab tearing. Attached Figure Description

[0015] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of a battery side-placed structure provided in an embodiment of this application, mainly showing the structure of a first support portion for supporting the electrode core provided on the inner bottom surface of the housing.

[0017] Figure 2 for Figure 1 A schematic diagram of the middle shell structure.

[0018] Figure 3 for Figure 1 A schematic diagram of the structure of the intermediate electrode core.

[0019] Figure 4 This is a schematic diagram of a battery side-mounted structure provided in an embodiment of this application, mainly showing the structure in which a second support portion for supporting the electrode core is provided on the inner top surface of the housing.

[0020] Figure 5 for Figure 4 A schematic diagram of the middle shell structure.

[0021] Figure 6 The structural schematic diagram of the battery placed on the side provided by an embodiment of the present application mainly embodies the structure that the first support part for supporting the pole core is arranged on the inner bottom surface of the shell and the second support part for supporting the pole core is arranged on the inner top surface of the shell.

[0022] The components in the drawings are identified as follows:

[0023] 11 shell; 111 shell body; 112 side end plate; 12 side end cover; 10 cavity; 20 opening;

[0024] 101 inner bottom surface; 102 outer bottom surface; 103 inner top surface; 104 outer top surface;

[0025] 2 pole post; 21 positive pole post; 22 negative pole post;

[0026] 3 pole core; 31 positive pole ear; 32 negative pole ear;

[0027] 4 first support part; 41 first support surface; 42 first connecting surface; 43 second connecting surface;

[0028] 5 second support part; 51 second support surface; 52 third connecting surface; 53 fourth connecting surface. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not 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.

[0030] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] To solve the technical problem that when the battery with the same side of the pole post is placed vertically, the pole core on the non-tab side moves downward due to the gravity of the pole core itself without being constrained by external force, affecting the performance of the pole core, and even pulling the pole core on the tab side, causing the tab to be easily torn. The application provides a battery, comprising a shell, a side end cover, a pole and a pole core, the shell has a cavity and an opening communicating with the cavity; the side end cover is arranged on the opening; the pole is arranged on the side end cover; the pole core is arranged in the cavity. Wherein, the inner bottom surface of the shell has a first supporting part, and the first supporting part is used for supporting the pole core. By supporting the top surface of the pole core through the first supporting part, the stress area of the pole core is increased, and the pole core on the non-tab side is prevented from tilting due to its own gravity, so as to improve the performance of the battery and reduce the risk of tab tearing.

[0034] As shown in Figure 1 The application provides a battery, which has a first direction X, a second direction Y and a third direction intersecting each other. The first direction X is the length direction of the battery, the second direction Y is the thickness direction of the battery, that is, the width direction of the pole core 3, and the third direction (not shown in the figure) is the direction perpendicular to the first direction X and the second direction Y, that is, the stacking direction of the pole core 3.

[0035] As shown in Figure 1As shown, the battery includes a housing 11, a side end cap 12, terminals 2, and an electrode core 3. The housing 11 has a cavity 10 and an opening 20 communicating with the cavity 10. The housing 11 is configured to be placed along a first direction X, that is, the length direction of the housing 11 is parallel to the horizontal direction. The side end cap 12 is disposed within the opening 20. The terminals 2 are disposed on the side end cap 12. The electrode core 3 is disposed within the cavity 10.

[0036] The side end cover 12 may be provided with explosion-proof holes, liquid injection holes, pole holes, etc., so that the pole 2, explosion-proof valve and other components can be installed on the side end cover 12.

[0037] like Figure 1 and Figure 2 As shown, in one embodiment, the housing 11 may include a housing body 111, with one end of the housing body 111 having an opening for mounting the side end cover 12 and the other end having an opening for mounting to the side end plate 112.

[0038] The electrode core 3 may include a positive electrode plate, a negative electrode plate, and a separator, with the positive and negative electrode plates stacked together and the separator disposed between adjacent positive and negative electrode plates. The electrode post 2 may include a positive electrode post 21 and a negative electrode post 22, both of which are disposed on the same side end cap 12.

[0039] The electrode core 3 also includes a positive electrode tab 31 connected to the positive electrode plate and a negative electrode tab 32 connected to the negative electrode plate. Multiple positive electrode tabs 31 are stacked in the third direction to form a positive electrode tab group, and multiple negative electrode tabs 32 are stacked in the third direction to form a negative electrode tab group. The positive electrode tab group and the negative electrode tab group are arranged alternately, and the positive electrode tab group is connected to the positive electrode post 21, and the negative electrode tab group is connected to the negative electrode post 22.

[0040] like Figure 3 As shown, since the electrode core 3 is stacked and placed sideways in the third direction, the electrode core 3 is not constrained by external forces in the second direction Y. The corner of the electrode core 3 on the non-electrode side ( Figure 3 The electrode core 3 (at point A) tilts and moves downwards due to its own gravity. This causes the electrode core 3 on the non-tab side to come into contact with the shell 11 and experience greater stress, affecting the performance of the electrode core 3. It may even cause the right tab of the electrode core 3 to tear under the influence of gravity.

[0041] The corner of the non-electrode side of the electrode core 3 refers to the position of the left side of the electrode core 3 at the connection between the housing 11 and the side end plate 112.

[0042] Therefore, in this embodiment, a support portion is provided on the inner surface of the housing 11 away from the electrode post 2 to support the electrode core 3, increase the force-bearing area of ​​the electrode core 3, avoid stress on the corner of the electrode core 3 on the non-electrode side, improve the battery performance, and reduce the risk of electrode tearing.

[0043] Specifically, in combinationFigure 1 and Figure 2 As shown in

[0044] The shell 11 further has an outer bottom surface 102 opposite to the inner bottom surface 101, the inner bottom surface 101 is convex to form the first support part 4 towards the direction close to the pole core 3, and the outer bottom surface 102 is concave at the position corresponding to the first support part 4. Therefore, the first support part 4 is integrally formed with the shell 11, and the first support part 4 can further reduce the weight of the battery while supporting the pole core 3.

[0045] The first support part 4 is used to support the pole core 3, and it can be understood that there can be a small gap between the first support part 4 and the pole core 3. Alternatively, the first support part 4 abuts to the bottom surface of the pole core 3, so that the pole core 3 can be prevented from shaking in the shell 11, the electrolyte in the shell 11 can be prevented from tilting to one side to affect the cycle performance of the battery, and the performance of the battery can be improved. In addition, the problem of tearing of the tab due to the gravity of the pole core 3 itself can also be avoided.

[0046] The first support part 4 is located away from the pole post 2, so that the first support part 4 can further directly support the pole core 3 on the non-tab side, avoid the pole core 3 on the non-tab side from tilting due to its own gravity, improve the performance of the battery, and reduce the risk of tearing of the tab.

[0047] The distance of the first support part 4 in the first direction X is less than or equal to half of the length of the shell 11 in the first direction X, so that the overall weight of the battery can be reduced while supporting the pole core 3.

[0048] The first support part 4 includes a first support surface 41, a first connecting surface 42, and a second connecting surface 43. The first support surface 41 is arranged parallel to the inner bottom surface 101. The first connecting surface 42 is connected between the first support surface 41 and the inner bottom surface 101, and is located close to the pole post 2. The second connecting surface 43 is connected between the first support surface 41 and the inner bottom surface 101, and is located away from the pole post 2.

[0049] As shown in Figure 2 The first connecting surface 42 is inclinedly connected between the first support surface 41 and the inner bottom surface 101, and the second connecting surface 43 is perpendicularly connected between the first support surface 41 and the inner bottom surface 101, so that the first connecting surface 42 has a guiding effect during assembly, guiding the pole core 3 into the cavity 10 of the shell 11.

[0050] There is a first included angle α between the first connecting surface 42 and the bottom surface of the pole core 3, and the first included angle α is 0° to 45°. It can be understood that the first included angle α (unit: °) can be any one of 0, 10, 15, 20, 25, 30, 35, 40, 45 or a range between any two values.

[0051] The number of first support parts 4 can be multiple, such as 2, 3, 4, 5, 6, 8, 9, 10... The specific number can be set according to the length of the shell 11 and actual needs, and no special limitation is made here.

[0052] In some embodiments, the housing 11 further has an inner top surface 103, and the inner top surface 103 is provided with a second support portion 5 that supports the pole core 3.

[0053] like Figure 4 and Figure 5 As shown, the housing 11 also has an outer top surface (104) opposite to the inner top surface 103. The inner top surface 103 protrudes towards the electrode core 3 to form a second support portion 5, and the outer top surface 104 is recessed at the position corresponding to the second support portion 5. Therefore, the second support portion 5 and the housing 11 are integrally formed. The second support portion 5 can not only support the electrode core 3, but also reduce the weight of the battery.

[0054] The second support portion 5 is used to support the electrode core 3. It is understood that the second support portion 5 abuts against the inner top surface 103 of the electrode core 3, and a small gap may exist between the inner top surface 103 of the housing 11 and the top surface of the electrode core 3. Optionally, the second support portion 5 abuts against the top surface of the electrode core 3, and there may be no gap between the inner bottom surface 101 of the housing 11 and the inner bottom surface 101 of the electrode core 3. This can prevent the electrode core 3 from shaking within the housing 11, and prevent the electrolyte inside the housing 11 from tilting to one side, thus affecting the battery's cycle performance and improving battery performance. Furthermore, it can also prevent the electrode tabs from tearing due to the electrode core 3's own weight.

[0055] The second support 5 is located on the side away from the electrode post 2. In this way, the second support 5 can further support the electrode core 3 on the non-electrode side directly, so as to abut the electrode core 3 against the inner top surface of the housing 11, thereby fixing the electrode core 3 inside the housing 11, preventing the electrode core 3 on the non-electrode side from tilting due to its own weight, thereby improving the performance of the battery and reducing the risk of electrode tearing.

[0056] The distance of the second support 5 in the first direction X is less than or equal to half the length of the housing 11 in the first direction X, so that the overall weight of the battery can be reduced when the electrode core 3 is brought into contact.

[0057] The second support portion 5 includes a second support surface 51, a third connecting surface 52, and a fourth connecting surface 53. The second support surface 51 is arranged parallel to the inner top surface 103. The third connecting surface 52 connects the second support surface 51 and the inner top surface 103 and is located on the side closer to the pole post 2. The fourth connecting surface 53 connects the second support surface 51 and the inner top surface 103 and is located on the side farther away from the pole post 2.

[0058] Combination Figure 4 and Figure 5 As shown, the first connecting surface 42 is inclinedly connected between the second supporting surface 51 and the inner top surface 103, and the second connecting surface 43 is vertically connected between the second supporting surface 51 and the inner top surface 103. Thus, during the assembly process, the third connecting surface 52 has a guiding function, guiding the pole core 3 into the cavity 10 of the housing 11.

[0059] The third connecting surface 52 and the top surface of the pole core 3 have a second included angle β, which is 0° to 45°. It can be understood that the second included angle β (unit: °) can be any one of 0, 10, 15, 20, 25, 30, 35, 40, 45 or a range between any two values.

[0060] The number of second support parts 5 can be multiple, such as 2, 3, 4, 5, 6, 8, 9, 10... The specific number can be set according to the length of the shell 11 and actual needs, and no special limitation is made here.

[0061] like Figure 6 As shown, in some embodiments, a first support portion 4 can be provided on the inner bottom surface 101 of the housing 11 and a second support portion 5 can be provided on the inner top surface 103. In this way, the electrode core 3 on the non-tab side can be supported in the second direction Y, further increasing the force-bearing area of ​​the electrode core 3, preventing the electrode core 3 from shaking, thereby improving the battery performance and reducing the risk of tab tearing.

[0062] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0063] The battery provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized by, The battery comprises: a shell having a cavity and an opening communicating with the cavity; a side end cover arranged on the opening; a pole arranged on the side end cover; and a pole core arranged in the cavity; wherein an inner bottom surface of the shell has a first support portion for supporting the pole core, and the first support portion is located away from the pole.

2. The battery according to claim 1, wherein the first support portion comprises a first support surface, a first connecting surface and a second connecting surface, the first support surface is arranged parallel to the inner bottom surface, the first connecting surface is connected between the first support surface and the inner bottom surface and located close to the pole, and the second connecting surface is connected between the first support surface and the inner bottom surface and located away from the pole.

3. The battery according to claim 2, wherein the first connecting surface and a bottom surface of the pole core form a first included angle, and the first included angle is 0°-45°.

4. The battery according to any one of claims 1-3, wherein an inner top surface of the shell has a second support portion, and the first support portion and the second support portion are used for supporting the pole core.

5. The battery according to claim 4, wherein the second support portion is located away from the pole; the number of the first support portion and the second support portion is plural.

6. The battery according to claim 4, wherein the second support portion comprises a second support surface, a third connecting surface and a fourth connecting surface, the second support surface is arranged parallel to the inner top surface, the third connecting surface is connected between the second support surface and the inner top surface and located close to the pole, and the fourth connecting surface is connected between the second support surface and the inner top surface and located away from the pole.

7. The battery according to claim 6, wherein the third connecting surface and a top surface of the pole core form a second included angle, and the second included angle is 0°-45°.

8. The battery according to claim 4, wherein the shell has an outer bottom surface opposite to the inner bottom surface and an outer top surface opposite to the inner top surface, the inner bottom surface is convex towards the pole core to form the first support portion, and the outer bottom surface is concave at a position corresponding to the first support portion; the inner top surface is convex towards the pole core to form the second support portion, and the outer top surface is concave at a position corresponding to the second support portion.

9. The battery according to claim 4, wherein the pole comprises a positive pole and a negative pole, and the positive pole and the negative pole are arranged on the side end cover. ​

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