Battery and electric equipment

Abstract

The utility model discloses a battery, which comprises a battery cell, a battery cover and a battery cover, and is characterized in that the battery cell comprises a main body and tabs connected to the main body; the shell comprises a main body part and a cover body part, the main body part and the cover body part jointly form a storage cavity, the cavity wall of the storage cavity comprises a first wall and a second wall which are oppositely arranged, the battery cell is arranged in the storage cavity, the tab is connected to the first wall and protrudes out of the storage cavity, the second wall comprises a weak part, and the weak part is connected with the battery cell. And the weak part is used for being punctured by the battery cell. The battery provided by the utility model can have relatively high safety.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery and electrical equipment. Background Technology

[0002] In related technologies, battery safety is extremely important. Battery safety testing includes heavy object impact testing, which involves dropping a heavy object (such as a round steel rod or rectangular steel bar) from a certain height onto the battery to observe whether the battery catches fire or explodes.

[0003] When existing batteries are subjected to a heavy impact, the internal cells may deform or break. Furthermore, when a cell breaks, it separates into two parts. One part of the cell, under external force, breaks through the top seal of the aluminum-plastic film, thus leaking out and preventing further compression and short circuits. This effectively prevents the cell from catching fire or exploding. The other part of the cell, however, remains trapped at the bottom of the aluminum-plastic film, continuing to deform and becoming highly susceptible to short circuits, potentially leading to fire or explosion. Consequently, the battery fails the heavy impact test, indicating a lower level of safety. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery that has high safety.

[0005] This utility model also proposes an electrical device.

[0006] The battery according to a first aspect embodiment of the present invention includes:

[0007] A battery cell includes a body and tabs, wherein the tabs are connected to the body;

[0008] The housing includes a main body and a cover, which together form a storage cavity. The cavity wall includes a first wall and a second wall disposed opposite to each other. The battery cell is disposed in the storage cavity. The electrode tab is connected to the first wall and protrudes out of the storage cavity. The second wall includes a weak portion.

[0009] The battery according to the embodiments of this utility model has at least the following beneficial effects: the battery cell is placed in the storage cavity, wherein the electrode tab is connected to the first wall and protrudes outside the storage cavity. When a heavy object impacts the battery, the heavy object may split the battery cell in two. The second wall has a weak point; after the battery cell splits into two parts, one part of the battery cell can break through the first wall and leak out, and the other part of the battery cell can break through the weak point and leak out. This effectively avoids the problem of the battery cell exploding after being squeezed and deformed by the casing, thereby improving the safety of the battery. Specifically, the battery can have a high level of safety.

[0010] In some embodiments of the battery according to this utility model, the weak part is provided as a groove.

[0011] According to some embodiments of the present invention, the second wall of the battery includes an outer layer, a metal layer and a heat-sealing layer stacked sequentially, wherein the outer layer is provided with the groove.

[0012] According to some embodiments of the present invention, the opening of the groove faces away from the battery cell.

[0013] According to some embodiments of the present invention, the outer layer of the battery has a thickness of L1 and the groove depth of L2, where 0 < L2 < L1.

[0014] According to some embodiments of the present invention, the second wall of the battery includes an outer layer, a metal layer and a heat-sealing layer stacked sequentially, wherein the metal layer is provided with the groove.

[0015] According to some embodiments of the present invention, the thickness of the metal layer in the battery is L3, and the depth of the groove is L4, where 0 < L4 ≤ 1 / 3 L3.

[0016] According to some embodiments of the present invention, the battery cell has a size of L5 along the width direction of the battery, and the groove has a size of L6, where 0.7L5≤L6≤1.1L5.

[0017] According to some embodiments of the present invention, the battery cell has a first corner and a second corner at one end near the second wall, and the projection of the first corner and / or the second corner onto the second wall falls within the groove.

[0018] According to some embodiments of the present invention, the battery cell has a size of L7 along its thickness direction, and the groove has a size of L8, where 0.05L7≤L8≤0.8L7.

[0019] The electrical device according to a second aspect embodiment of the present invention includes: a battery according to any one of the first aspect embodiments.

[0020] The electrical device according to the embodiments of this utility model has at least the following beneficial effects: The battery cell is placed in a storage cavity, wherein the electrode tabs are connected to the first wall and protrude outside the storage cavity. When a heavy object impacts the battery, the object may split the battery cell in two. The second wall has a weak point; after the battery cell splits into two parts, one part can break through the first wall and leak out, and the other part can break through the weak point and leak out. This effectively avoids the problem of the battery cell exploding after being squeezed and deformed by the casing, thereby improving battery safety. Specifically, the battery has high safety. Furthermore, the electrical device with this battery also has high safety.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic diagram of a battery according to some embodiments of the present invention;

[0024] Figure 2 This is a cross-sectional schematic diagram of the second wall in the battery according to the first embodiment of the present invention;

[0025] Figure 3 This is a cross-sectional schematic diagram of the second wall in the battery according to the second embodiment of the present invention;

[0026] Figure 4 This is a cross-sectional schematic diagram of the second wall in the battery according to the third embodiment of the present invention;

[0027] Figure 5 This is a cross-sectional schematic diagram of the second wall in the battery according to the fourth embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the second wall in a battery according to some embodiments of the present invention;

[0029] Figure 7 This is a cross-sectional schematic diagram of the second wall in the battery according to the fifth embodiment of this utility model.

[0030] Figure label:

[0031] Battery 10, cell 100, body 110, tab 120, first corner 130, second corner 140, shell 200, storage cavity 210, first wall 220, second wall 230, weak part 300, outer layer 400, metal layer 500, heat sealing layer 600, groove 700, gap 800. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0036] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0038] In related technologies, battery safety is extremely important. Battery safety testing includes heavy object impact testing, which involves dropping a heavy object (such as a round steel rod or rectangular steel bar) from a certain height onto the battery to observe whether the battery catches fire or explodes.

[0039] When existing batteries are subjected to a heavy impact, the bare cells inside may deform or break. Furthermore, when a cell breaks, it separates into two parts. One part of the cell, under external force, breaks through the top seal of the aluminum-plastic film, thus leaking out from the top of the film and preventing further compression and short circuits, effectively preventing the cell from catching fire or exploding. The other part of the cell remains compressed at the bottom of the aluminum-plastic film, continuing to deform, and is highly susceptible to short circuits, potentially leading to fire or explosion. Consequently, the battery fails the heavy impact test, resulting in low battery safety. Therefore, this application proposes a new type of battery.

[0040] Please refer to Figure 1 In some embodiments, the battery 10 includes a casing 200 and a battery cell 100. The casing 200 includes a main body 110 and a cover, which together form a storage cavity 210. The casing 200 may be made of an aluminum-plastic film. Specifically, after perforating the aluminum-plastic film, the film includes a main body 110 with a cavity and a cover capable of sealing the cavity. The battery cell 100 is then placed into the storage cavity 210, and the cover and main body 110 are heat-sealed to complete the encapsulation of the battery cell 100. The battery cell 100 includes a main body 110 and tabs 120 connected to the main body 110. The tabs 120 include a positive tab 120 and a negative tab 120. The main body 110 includes a positive electrode plate and a negative electrode plate. The positive tab 120 is connected to the positive electrode plate, and the negative tab 120 is connected to the negative electrode plate. This part is prior art and will not be described in detail here.

[0041] The structure of storage cavity 210 is described below. Please refer to [link / reference]. Figure 1 The storage cavity 210 has a first wall 220 and a second wall 230 disposed opposite to each other. A battery cell 100 is disposed in the storage cavity 210, and a tab 120 is connected to the first wall 220 and protrudes outside the storage cavity 210. The storage cavity 210 can be cubic, cuboid, or other shapes. The second wall 230 includes a weak portion 300 for the battery cell 100 to be punctured. Specifically, the battery cell 100 is placed in the storage cavity 210, wherein the tab 120 is connected to the first wall 220 and protrudes outside the storage cavity 210. When a heavy object impacts the battery 10, the heavy object may split the battery cell 100 in two. The second wall 230 has a weak part 300. After the battery cell 100 is split into two parts, one part of the battery cell 100 can break through the first wall 220 and leak out, and the other part of the battery cell 100 can break through the weak part 300 and leak out. This can effectively avoid the problem of the battery cell 100 exploding after compressing the casing 200 and deforming, thereby improving the safety of the battery 10. In particular, the battery 10 has a high degree of safety.

[0042] Furthermore, in the prior art, when the cover and the main body 110 are heat-sealed, three sealing edges are formed on the main body 110: two side sealing edges and one top sealing edge. The two side sealing edges are located on both sides of the storage cavity 210 in the width direction, and the top sealing edge is located on one side of the storage cavity 210 in the length direction. When the battery cell 100 breaks in two under external impact, the impact will cause the battery cell 100 to move. The strength of the top sealing edge is less than the strength of the casing 200 itself. Therefore, one part of the battery cell 100 is easy to leak out from the top sealing edge, but the other part of the battery cell 100 is not easy to leak out from the bottom of the casing 200, thus they are squeezed together and are prone to explosion. After providing a weak part 300 on the second wall 230 in this application, the strength of the second wall 230 can be effectively reduced, so that the battery cell 100 can easily puncture the second wall 230 and leak out. In addition, the weak part 300 can also encapsulate the battery cell 100 when the battery 10 is in normal use.

[0043] Furthermore, the specific structure of the second wall 230, including the weak section 300, is described below. Please refer to [reference needed]. Figure 2 In some embodiments, the weak portion 300 is configured as a groove 700. Specifically, the weak portion 300 can be configured as a groove 700, which can reduce the thickness of the second wall 230, thereby indirectly weakening the strength of the second portion and making it easier for the battery cell 100 to puncture.

[0044] Furthermore, the specific structure of the second wall 230 is described below; please refer to [the relevant documentation]. Figure 2 and Figure 3 In some embodiments, the second wall 230 includes an outer layer 400, a metal layer 500, and a heat-sealing layer 600 stacked sequentially. The housing 200 can be an aluminum-plastic film, the outer layer 400 can be a nylon layer, the metal layer 500 can be an aluminum layer, and the heat-sealing layer 600 can be a PP layer. The second wall 230 is provided with a groove 700, specifically, the outer layer 400 is provided with a groove 700. By providing a groove 700 on the outer layer 400, the thickness of the outer layer 400 can be effectively reduced, thus lowering its strength and making it easier for the battery cell 100 to puncture it. After the outer layer 400 is provided with a groove 700, and the housing 200 is heat-sealed, the metal layer 500 and the heat-sealing layer 600 fill the groove 700, thereby forming a groove 700 on the heat-sealing layer 600. Furthermore, in addition to providing the groove 700 on the outer layer 400, another way to reduce the strength of the second wall 230 is to reduce the thickness of the outer layer 400, so that the thickness of the outer layer 400 constituting the second wall 230 is less than the thickness of the outer layer 400 constituting the first wall 220.

[0045] Further, please refer to Figure 2In some embodiments, the opening of the groove 700 faces away from the cell 100. Specifically, having the opening of the groove 700 facing away from the cell 100 facilitates the cell 100 puncturing the second wall 230, thereby improving the safety of the battery 10. In other embodiments, the opening of the groove 700 may face towards the cell 100. Furthermore, having the opening of the groove 700 facing away from the cell 100 also facilitates processing on the outer layer 400; that is, after the housing 200 is manufactured, the groove 700 can be machined on the outer surface of the outer layer 400.

[0046] Further, please refer to Figure 2 In some embodiments, the thickness of the outer layer 400 is L1, and the depth of the groove 700 is L2, where 0 < L2 < L1. Specifically, the depth of the groove 700 can be 1 / 2, 1 / 3, or 1 / 4 of the thickness of the outer layer 400, etc. If the depth of the groove 700 is much greater than the thickness of the outer layer 400, the outer layer 400 will be too thin, which may result in poor sealing of the casing 200 and affect the safety and stability of the battery 10. Therefore, the depth of the groove 700 cannot be too large, otherwise it will affect the performance of the battery 10.

[0047] Furthermore, in addition to providing a groove 700 on the outer layer 400, a groove 700 can also be provided on the metal layer 500. For details, please refer to... Figure 4 and Figure 5In some embodiments, the second wall 230 includes an outer layer 400, a metal layer 500, and a heat-sealing layer 600 stacked sequentially, with the metal layer 500 having a groove 700. After the metal layer 500 has the groove 700, and the housing 200 is heat-sealed, the outer layer 400 and the heat-sealing layer 600 fill the groove 700, thereby forming the groove 700 on the heat-sealing layer 600 or the outer layer 400. The metal layer 500 can be an aluminum layer. Having the groove 700 on the metal layer 500 reduces its strength, making it easier for the battery cell 100 to puncture the second wall 230. The shape of the groove 700 is not specifically limited; it can be rectangular, elliptical, square, or oblong, etc. In other embodiments, the groove 700 can also be formed on the heat-sealing layer 600. Alternatively, the thickness of the second wall 230 can be reduced so that the thickness of the second wall 230 is less than the thickness of the first wall 220. Specifically, reducing the thickness of the second wall 230 can be achieved by reducing the thickness of the outer layer 400, or reducing the thickness of the metal layer 500, or reducing the thickness of the heat-sealing layer 600, or simultaneously reducing the thicknesses of the outer layer 400 and the metal layer 500, or simultaneously reducing the thicknesses of the outer layer 400, the metal layer 500, and the heat-sealing layer 600.

[0048] Furthermore, in some embodiments, please refer to Figure 4 The thickness of the metal layer 500 is L3, and the depth of the groove 700 is L4, where 0 < L4 ≤ 1 / 3 L3. Specifically, the depth of the groove 700 can be 1 / 4, 1 / 5, or 1 / 3 of the thickness of the metal layer 500. If the depth of the groove 700 is greater than one-third of the thickness of the metal layer 500, the metal layer 500 will be too thin, which may result in poor sealing of the casing 200 or lower structural strength of the casing 200, affecting the safety and stability of the battery 10. Therefore, the depth of the groove 700 cannot be too large, otherwise it will affect the performance of the battery 10.

[0049] Furthermore, in some embodiments, along the length of the battery 10, the projection of the cell 100 falls within the projection range of the groove 700. That is, in the width direction of the battery 10, the area of ​​the groove 700 is larger than the area of ​​the cell 100. When the area of ​​the groove 700 is larger than the area of ​​the cell 100, this can effectively ensure that the end face of the cell 100 can fully abut against the groove 700, thereby puncturing the second wall 230. Specifically, the area of ​​the groove 700 being larger than the area of ​​the cell 100 can mean that the length of the groove 700 is greater than the width of the cell 100, and the width of the groove 700 is greater than the thickness of the cell 100. Conversely, if along the length of the battery 10, the projection of the cell 100 is larger than the projection of the groove 700, then the cell 100 may abut against the part of the second wall 230 with higher strength, thus failing to puncture the second wall 230.

[0050] In some embodiments, along the width direction of the battery 10, the size of the cell 100 is L5, and the size of the groove 700 is L6, where 0.7L5 ≤ L6 ≤ 1.1L5. Specifically, L6 is equal to 0.7L5, 0.8L5, 0.9L5, or 1.1L5. When L6 is less than 0.7L5, the width of the groove 700 is too small, which may cause the cell 100 to be unable to quickly puncture the groove 700. When L6 is greater than 1.1L5, the width of the groove 700 is too large, which may reduce the strength of the casing 200 and cause the battery 10 to leak under normal circumstances.

[0051] In some embodiments, along the thickness direction of the battery 10, the size of the cell 100 is L7, and the size of the groove 700 is L8, where 0.05L7 ≤ L8 ≤ 0.8L7. Specifically, L8 is equal to 0.05L7, 0.08L7, 0.1L7, 0.5L7, 0.6L7, or 0.8L7. When L8 is less than 0.05L7, the thickness of the groove 700 is too small, which may cause the cell 100 to be unable to quickly puncture the groove 700. When L8 is greater than 0.8L7, the thickness of the groove 700 is too large, which may reduce the strength of the casing 200 and cause the battery 10 to leak under normal circumstances.

[0052] In some embodiments, the end of the battery cell 100 near the second wall 230 has a first corner 130 and a second corner 140, the projections of the first corner 130 and / or the second corner 140 onto the second wall 230 falling within the groove 700. Specifically, "the projections of the first corner 130 and / or the second corner 140 onto the second wall 230 falling within the groove 700" means that the projection of the first corner 130 onto the second wall 230 falls within the groove 700, or the projection of the second corner 140 onto the second wall 230 falls within the groove 700, or both the projections of the first corner 130 and the second corner 140 onto the second wall 230 fall within the groove 700. This arrangement facilitates the first corner 130 or the second corner 140 abutting against the groove 700, thereby quickly puncturing the groove 700 and improving the safety of the battery 10.

[0053] Furthermore, in addition to setting the weak part 300 as a groove 700, the weak part 300 can also be set as a gap 800. For details, please refer to... Figure 6 and Figure 7 In some embodiments, the second wall 230 includes an outer layer 400, a metal layer 500, and a heat-sealing layer 600 stacked sequentially. The outer layer 400 has a weak portion 300, which is configured as a gap 800. Specifically, configuring the weak portion 300 as a gap 800 means that a gap 800 is machined into the second wall 230, for example, by cutting to form the weak portion 300. This method provides a lower-strength area on the second wall 230 for the battery cell 100, making it easier for the battery cell 100 to puncture it, thus improving the safety of the battery 10. Configuring the weak portion 300 as a gap 800 can also involve forming a scratch on the second wall 230, thereby reducing the strength of the outer layer 400.

[0054] Further, please refer to Figure 6 and Figure 7 In some embodiments, the thickness of the outer layer 400 is L1, and the depth of the gap 800 is L5, where L5 ≤ 1 / 2 L1. Specifically, the depth of the gap 800 can be 1 / 6, 1 / 7, or 1 / 5 of the thickness of the outer layer 400. If the depth of the gap 800 is too deep, it will cause the outer layer 400 to fail completely, and the outer layer 400 will not be able to protect the battery 10 well, resulting in low reliability of the battery 10.

[0055] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery, characterized in that, include: A battery cell includes a body and tabs, wherein the tabs are connected to the body; The housing includes a main body and a cover, which together form a storage cavity. The cavity wall includes a first wall and a second wall disposed opposite to each other. The battery cell is disposed in the storage cavity. The electrode tab is connected to the first wall and protrudes out of the storage cavity. The second wall includes a weak portion.

2. The battery according to claim 1, characterized in that, The weak part is configured as a groove.

3. The battery according to claim 2, characterized in that, The second wall comprises an outer layer, a metal layer, and a heat-sealing layer stacked sequentially, wherein the outer layer is provided with the groove.

4. The battery according to claim 3, characterized in that, The opening of the groove faces away from the battery cell.

5. The battery according to claim 3, characterized in that, The outer layer has a thickness of L1, and the groove has a depth of L2, where 0 < L2 < L1.

6. The battery according to claim 2, characterized in that, The second wall comprises an outer layer, a metal layer, and a heat-sealing layer stacked sequentially, wherein the metal layer is provided with the groove.

7. The battery according to claim 6, characterized in that, The thickness of the metal layer is L3, and the depth of the groove is L4, where 0 < L4 ≤ 1 / 3L3.

8. The battery according to claim 2, characterized in that, Along the width direction of the battery, the size of the cell is L5, and the size of the groove is L6, where 0.7L5≤L6≤1.1L5.

9. The battery according to claim 2, characterized in that, The battery cell has a first corner and a second corner at one end near the second wall, and the projection of the first corner and / or the second corner onto the second wall falls within the groove.

10. The battery according to claim 2, characterized in that, Along the thickness direction of the battery, the size of the cell is L7, the size of the groove is L8, and 0.05L7≤L8≤0.8L7.

11. Electrical equipment, characterized in that, Includes the battery as described in any one of claims 1 to 10.

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