Battery and electric device

Abstract

The utility model discloses a kind of battery and electrical equipment, battery includes: shell, with storage cavity, the cavity wall of storage cavity is provided with recess;Battery cell, set in the recess, the recess is located in the thickness direction of the battery cell one side, the groove wall of the recess towards the battery cell is first wall, the first wall includes sequentially connected first area, second area and third area along the length direction of the battery cell, the battery cell includes positive plate and negative plate, the positive plate is located in the outermost side of the thickness direction of the battery cell, the negative plate is protruded relative to the positive plate along the length direction of the battery cell, along the thickness direction of the battery cell, the projection of the second area and the projection of the positive plate all overlap;Two isolation pieces respectively cover the first area and the third area.The battery of the utility model can effectively avoid battery short circuit, with higher security.

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, batteries consist of an aluminum-plastic film and battery cells. The aluminum-plastic film is perforated to form a storage cavity, which allows the battery cells to be placed inside, thus completing the encapsulation of the cells. It is conceivable that the larger the storage cavity, the larger the volume of the battery cells that can be placed, which can effectively improve the energy density of the battery.

[0003] To improve energy density, existing batteries typically thin the aluminum-plastic film. Specifically, this is achieved by thinning or removing the PP layer at the storage cavity location, which increases the space within the storage cavity and thus improves the battery's energy density. A battery cell consists of a positive electrode and a negative electrode, with the negative electrode being larger than the positive electrode. The positive electrode is usually located on the outer edge of the cell. However, after the aluminum-plastic film is thinned or removed, the portion of the negative electrode extending beyond the positive electrode may come into contact with the aluminum layer of the aluminum-plastic film, potentially causing a short circuit in the battery. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery that can effectively prevent short circuits and 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] The housing has a storage cavity, the cavity wall of which is provided with grooves;

[0008] A battery cell is disposed in the groove, the groove being located on one side of the battery cell in the thickness direction. The groove wall facing the battery cell is a first wall, the first wall comprising a first region, a second region, and a third region connected sequentially along the length direction of the battery cell. The battery cell includes a positive electrode and a negative electrode. The positive electrode is located on the outermost side of the battery cell in the thickness direction, and the negative electrode protrudes relative to the positive electrode along the length direction of the battery cell. Along the thickness direction of the battery cell, the projections of the second region and the positive electrode completely overlap.

[0009] Two isolation elements cover the first area and the third area respectively.

[0010] The battery according to the embodiments of this utility model has at least the following beneficial effects: along the length direction of the cell, the negative electrode protrudes relative to the positive electrode, and the cell is located in a groove. The groove can improve the energy density of the battery. The positive electrode is located on the outermost side of the cell and is in contact with the first wall. In the prior art, after the casing is provided with a groove and the negative electrode protrudes relative to the positive electrode, the negative electrode may come into contact with the aluminum layer of the casing, which may cause a short circuit. In this application, the projection of the positive electrode overlaps with the projection of the second region. The positive electrode can isolate most of the negative electrode from the aluminum layer. After the separator covers the first region and the third region respectively, the part of the negative electrode protruding relative to the positive electrode can be isolated by the separator. Thus, the safety of the battery can be improved. Specifically, the battery can effectively avoid battery short circuits and has high safety.

[0011] According to some embodiments of the present invention, the separator in the battery further covers a portion of the second region.

[0012] According to some embodiments of the present invention, the battery separator has a receiving cavity, one end of the battery cell in the longitudinal direction is located in the receiving cavity, the battery cell is connected to the inner surface of the separator, and the first wall is connected to the outer surface of the separator.

[0013] According to some embodiments of the present invention, the separator is adhesive paper, which is wrapped around one end of the battery cell along its length to form the receiving cavity.

[0014] According to some embodiments of the present invention, the thickness of the adhesive tape in the battery is H, where 0.008mm ≤ H ≤ 0.02mm.

[0015] According to some embodiments of the present invention, the groove wall of the battery further includes a second wall, which is connected to the circumferential edge of the first wall. Along the length direction of the battery cell, the distance between the second wall and the positive electrode is L1, and the size of the separator is L2, where L2 > L1.

[0016] According to some embodiments of the present invention, the size of the separator along the length of the cell is L2, and the size of the negative electrode protruding from one end relative to the positive electrode is L3, where L2 > L3.

[0017] According to some embodiments of the present invention, the battery housing includes a heat-sealing layer, a metal layer, and an outer layer stacked together, wherein the heat-sealing layer is provided with the groove.

[0018] According to some embodiments of the present invention, the battery housing includes a heat-sealing layer, a metal layer, and an outer layer stacked together, wherein the heat-sealing layer and the metal layer together define the groove.

[0019] The electrical device according to the second aspect of the present invention includes the battery described in 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: Along the length of the battery cell, the negative electrode protrudes relative to the positive electrode, and the battery cell is located in a groove. The groove arrangement can improve the energy density of the battery. The positive electrode is located on the outermost side of the battery cell and contacts the first wall. In the prior art, after the casing has a groove and the negative electrode protrudes relative to the positive electrode, the negative electrode may contact the aluminum layer of the casing, which may lead to a short circuit. In this application, the projection of the positive electrode overlaps with the projection of the second region. The positive electrode can isolate most of the negative electrode from the aluminum layer. After the separator covers the first and third regions respectively, the portion of the negative electrode protruding relative to the positive electrode can be isolated by the separator, thus improving battery safety. Specifically, the battery can effectively avoid short circuits and 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 the first embodiment of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

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

[0026] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0027] Figure 5 This is a partial schematic diagram of the battery according to the first embodiment of the present invention;

[0028] Figure 6 This is a partial schematic diagram of the battery according to the second embodiment of the present invention.

[0029] Figure label:

[0030] Battery 10, casing 100, storage cavity 110, groove 120, first wall 130, first zone 140, second zone 150, third zone 160, second wall 170, cell 200, positive electrode 300, negative electrode 400, separator 500, receiving cavity 510, heat sealing layer 600, metal layer 700, outer layer 800. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In related technologies, batteries consist of an aluminum-plastic film and battery cells. The aluminum-plastic film is perforated to form a storage cavity, which allows the battery cells to be placed inside, thus completing the encapsulation of the cells. It is conceivable that the larger the storage cavity, the larger the volume of the battery cells that can be placed, which can effectively improve the energy density of the battery.

[0037] To improve energy density, existing batteries typically thin the aluminum-plastic film. Specifically, this is achieved by thinning or removing the PP layer at the storage cavity location, which increases the storage cavity space and thus improves the battery's energy density. The battery cell includes a positive electrode and a negative electrode, with the negative electrode being larger than the positive electrode. The positive electrode is usually located on the outer side of the cell. However, after thinning or removing the aluminum-plastic film, the portion of the negative electrode extending beyond the positive electrode may come into contact with the aluminum layer of the aluminum-plastic film, potentially causing a short circuit. For example, if the PP layer is only 5µm thick after thinning, the insulation effect between the negative electrode and the aluminum layer is poor; conversely, if the PP layer is completely thin, there is a risk of direct contact between the negative electrode and the aluminum layer. Therefore, this application proposes a battery.

[0038] Please refer to Figures 1 to 6In some embodiments, the battery 10 includes a housing 100, a battery cell 200, and a separator 500. The housing 100 has a storage cavity 110, and the shape of the housing 100 can be a cube or a cuboid, as can the shape of the storage cavity 110. A groove 120 is provided in the cavity wall of the storage cavity 110. The groove 120 can be square or rectangular. Providing the groove 120 in the cavity wall of the storage cavity 110 effectively thins the cavity wall, thereby increasing the space of the storage cavity 110 and improving the energy density of the battery 10. The battery cell 200 is disposed in the groove 120, which is located on one side of the battery cell 200 in the thickness direction. Two grooves 120 can be provided, located on opposite sides of the battery cell 200 in the thickness direction. Placing the battery cell 200 in the groove 120 increases the energy density of the battery 10. The groove wall of the groove 120 facing the battery cell 200 is a first wall 130. The first wall 130 may be the bottom wall of the groove 120. The first wall 130 includes a first region 140, a second region 150, and a third region 160 connected sequentially along the length of the cell 200. The first region 140 and the third region 160 are respectively connected to the two ends of the second region 150. The cell 200 includes a positive electrode 300 and a negative electrode 400, with the positive electrode 300 located on the outermost side in the thickness direction of the cell 200. Specifically, the cell 200 may be formed by stacking and winding the positive electrode 300 and the negative electrode 400, with the positive electrode 300 located on the outermost layer 800 of the cell 200 after winding. The cell 200 may also be formed by alternately stacking multiple positive electrode 300s and negative electrode 400s, with two of the multiple positive electrode 300s located on opposite sides in the thickness direction of the cell 200. The negative electrode 400 protrudes relative to the positive electrode 300 along the length of the cell 200; that is, the width of the negative electrode 400 is greater than the width of the positive electrode 300. Along the thickness direction of the cell 200, the projections of the second region 150 and the positive electrode 300 completely overlap. Two insulating members 500 cover the first region 140 and the third region 160, respectively.Specifically, along the length of the cell 200, the negative electrode 400 protrudes relative to the positive electrode 300. The cell 200 is located in the groove 120. The groove 120 can improve the energy density of the battery 10. The positive electrode 300 is located on the outermost side of the cell 200 and is in contact with the first wall 130. In the prior art, after the casing 100 is provided with the groove 120 and the negative electrode 400 protrudes relative to the positive electrode 300, the negative electrode 400 may come into contact with the aluminum layer of the casing 100, which may cause a short circuit in the battery 10. In this application, the projection of the positive electrode 300 overlaps with the projection of the second region 150. The positive electrode 300 can isolate most of the negative electrode 400 from the aluminum layer. After the separator 500 covers the first region 140 and the third region 160 respectively, the part of the negative electrode 400 protruding relative to the positive electrode 300 can be isolated by the separator 500. In this way, the safety of the battery 10 can be improved. Specifically, battery 10 can effectively prevent short circuits and has high safety.

[0039] Furthermore, after the groove 120 is formed on the cavity wall of the storage chamber 110, the thickness of the first wall 130 of the groove 120 can be the sum of the thickness of the heat-sealing layer 600, the thickness of the metal layer 700, and the thickness of the outer layer 800. Alternatively, the thickness of the first wall 130 can also be the sum of the thickness of the metal layer 700 and the outer layer 800. While forming the groove 120 can increase the energy density of the battery 10, the cell 200 is located within the groove 120, making it easy for the negative electrode 400 to short-circuit with the aluminum layer, thus causing safety issues. In this application, along the thickness direction of the cell 200, the projection of the second region 150 and the projection of the positive electrode 300 completely overlap. That is, the positive electrode 300 can completely cover the second region 150, which can effectively prevent the second region 150 from contacting the negative electrode 400. Furthermore, the two insulating elements 500 cover the first region 140 and the third region 160 respectively. In this way, the first region 140, the second region 150 and the third region 160 are isolated from the negative electrode 400 by the combined action of the positive electrode 300 and the insulating elements 500, which can effectively avoid the problem of short circuit.

[0040] Specifically, the two separators 500 can respectively cover the first region 140 and the third region 160. However, due to manufacturing precision limitations, there may be a discrepancy between the projections of the second region 150 and the positive electrode 300. This could cause the portion of the negative electrode 400 protruding from the positive electrode 300 to contact the second region 150. To further improve the safety performance of the battery 10, the separators 500 can cover a portion of the second region 150. Please refer to [the relevant documentation / reference]. Figure 1 and Figure 2 In some embodiments, the isolation element 500 also covers a portion of the second zone 150.

[0041] Furthermore, in some embodiments, the cell 200 being disposed in the groove 120 specifically means that the positive electrode 300 located on the outermost layer 800 of the cell 200 is disposed in the groove 120, and the portion of the negative electrode 400 protruding from the positive electrode 300 overlaps the edge of the groove 120. The heat-sealing layer 600 at the overlap of the negative electrode 400 is not thinned, thus it can have better insulation performance and there is no need to provide an insulating member 500.

[0042] Further, please refer to Figure 3 and Figure 4 In some embodiments, the separator 500 has a receiving cavity 510, and one end of the battery cell 200 along its length is located in the receiving cavity 510. Specifically, the cross-sectional shape of one end of the battery cell 200 along its length can be rectangular. After one end of the battery cell 200 along its length is located in the receiving cavity 510, both ends of the positive electrode 300 and the negative electrode 400 are located in the receiving cavity 510, which can effectively prevent the negative electrode 400 from contacting the housing 100. The battery cell 200 is connected to the inner surface of the separator 500, and the first wall 130 is connected to the outer surface of the separator 500. Specifically, the connection of the battery cell 200 to the inner surface of the separator 500 means that after one end of the battery cell 200 along its length is located in the receiving cavity 510, the battery cell 200 and the cavity wall of the receiving cavity 510 are connected. The first wall 130 being connected to the outer surface of the isolator 500 specifically means that after the isolator 500 accommodates part of the battery cell 200, the surface opposite to the accommodating cavity 510 is connected to the first wall 130. For example, one isolator 500 is connected to the first region 140 of the first wall 130, and another isolator 500 is connected to the third region 160 of the first wall 130.

[0043] Further, the specific structure of the insulating member 500 is described below. In some embodiments, the insulating member 500 is adhesive tape, which is wrapped around one end of the battery cell 200 along its length to form a receiving cavity 510. Specifically, by wrapping the adhesive tape around one end of the battery cell 200 along its length, the adhesive tape forms a receiving cavity 510, which can effectively wrap one end of the battery cell 200 along its length and achieve the effect of isolation. In addition, besides adhesive tape, the insulating member 500 can also be formed by spraying it onto one end of the battery cell 200 along its length, for example, by spraying an insulating material onto one end of the battery cell 200 along its length. In other embodiments, the insulating material can also be sprayed onto the first wall 130, for example, onto the first region 140, the second region 150, and the third region 160. Alternatively, adhesive tape can be bonded to the first wall 130 to form the insulating member 500.

[0044] Furthermore, in some embodiments, the thickness of the adhesive tape is H, where 0.008 mm ≤ H ≤ 0.02 mm. Specifically, the thickness of the adhesive tape can be 0.008 mm, 0.009 mm, 0.01 mm, 0.015 mm, 0.018 mm, or 0.02 mm. When the thickness of the adhesive tape is less than 0.008 mm, the insulating effect of the adhesive tape is poor; when the thickness of the adhesive tape is greater than 0.02 mm, the thickness of the adhesive tape is too large, resulting in material waste and excessive space occupation.

[0045] Further, please refer to Figure 2 In some embodiments, the groove wall of the groove 120 further includes a second wall 170. The first wall 130 can be the bottom wall of the groove 120, and the second wall 170 can be the side wall of the groove 120. The second wall 170 is connected to the circumferential edge of the first wall 130. Along the length direction of the cell 200, the distance between the second wall 170 and the positive electrode 300 is L1, and the size of the separator 500 is L2, where L2 > L1. The distance between the second wall 170 and the positive electrode 300 specifically refers to the closest distance between the second wall 170 and the positive electrode 300. If L1 is greater than L2, the separator 500 may not be able to completely cover the portion of the negative electrode 400 protruding from the positive electrode 300, which may reduce the safety of the battery 10. If L1 equals L2, the separator 500 can cover the portion of the negative electrode 400 protruding from the positive electrode 300, but this requires higher processing precision, which increases additional costs.

[0046] Further, please refer to Figure 2 In some embodiments, along the length of the cell 200, the size of the separator 500 is L2, and the protrusion of the negative electrode 400 relative to the positive electrode 300 is L3, where L2 > L3. Specifically, when the protrusion of the negative electrode 400 relative to the positive electrode 300 is smaller than the size of the separator 500, this can reduce the requirements for processing accuracy and improve processing efficiency. Furthermore, the setting of L2 being greater than L3 can effectively ensure that the separator 500 isolates the negative electrode 400 from the first wall 130, which can further improve the safety performance of the battery 10.

[0047] Furthermore, the specific structure of the housing 100 is described below; please refer to [the relevant documentation]. Figure 2In some embodiments, the housing 100 includes a heat-sealing layer 600, a metal layer 700, and an outer layer 800 stacked together, with the heat-sealing layer 600 having a groove 120. The heat-sealing layer 600 can be made of PP, the metal layer 700 can be made of aluminum, and the outer layer 800 can be made of nylon. The groove 120 on the heat-sealing layer 600 increases the volume of the storage cavity 110, thereby increasing the energy density of the battery 10. Specifically, the groove 120 on the heat-sealing layer 600 can be provided by thinning the heat-sealing layer 600; for example, if the original thickness of the heat-sealing layer 600 is 30 μm, the thickness can be reduced to 10 μm. Alternatively, when thinning the heat-sealing layer 600, more than 75% of its thickness can be removed.

[0048] Furthermore, the following describes another structure of the housing 100; please refer to [reference needed]. Figure 5 and Figure 6 In some embodiments, the housing 100 includes a heat-sealing layer 600, a metal layer 700, and an outer layer 800 stacked together, with the heat-sealing layer 600 and the metal layer 700 jointly defining a groove 120. That is, after the heat-sealing layer 600 is completely removed, the heat-sealing layer 600 can form the second wall 170 of the groove 120, and the metal layer 700 can form the first wall 130 of the groove 120, which can significantly improve the energy density of the battery 10.

[0049] In some embodiments, the electrical device includes the battery 10 of any of the above embodiments. Along the length of the cell 200, the negative electrode 400 protrudes relative to the positive electrode 300. The cell 200 is located in the groove 120. The groove 120 can improve the energy density of the battery 10. The positive electrode 300 is located on the outermost side of the cell 200 and is in contact with the first wall 130. In the prior art, after the casing 100 is provided with the groove 120 and the negative electrode 400 protrudes relative to the positive electrode 300, the negative electrode 400 may come into contact with the aluminum layer of the casing 100, which may cause a short circuit in the battery 10. In this application, the projection of the positive electrode 300 overlaps with the projection of the second region 150. The positive electrode 300 can isolate most of the negative electrode 400 from the aluminum layer. After the separator 500 covers the first region 140 and the third region 160 respectively, the part of the negative electrode 400 protruding relative to the positive electrode 300 can be isolated by the separator 500. In this way, the safety of the battery 10 can be improved. Specifically, the battery 10 effectively prevents short circuits and has a high level of safety. Furthermore, electrical devices equipped with this battery 10 also have a high level of safety.

[0050] 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: The housing has a storage cavity, the cavity wall of which is provided with grooves; A battery cell is disposed in the groove, the groove being located on one side of the battery cell in the thickness direction. The groove wall facing the battery cell is a first wall, the first wall comprising a first region, a second region, and a third region connected sequentially along the length direction of the battery cell. The battery cell includes a positive electrode and a negative electrode. The positive electrode is located on the outermost side of the battery cell in the thickness direction, and the negative electrode protrudes relative to the positive electrode along the length direction of the battery cell. Along the thickness direction of the battery cell, the projections of the second region and the positive electrode completely overlap. Two isolation elements cover the first area and the third area respectively.

2. The battery according to claim 1, characterized in that, The isolation element also covers a portion of the second zone.

3. The battery according to claim 1, characterized in that, The insulating member has a receiving cavity, one end of the battery cell along its length is located in the receiving cavity, the battery cell is connected to the inner surface of the insulating member, and the first wall is connected to the outer surface of the insulating member.

4. The battery according to claim 3, characterized in that, The insulating element is adhesive tape, which is wrapped around one end of the battery cell along its length to form the receiving cavity.

5. The battery according to claim 4, characterized in that, The thickness of the adhesive tape is H, where 0.008mm ≤ H ≤ 0.02mm.

6. The battery according to claim 1, characterized in that, The groove wall also includes a second wall, which is connected to the circumferential edge of the first wall. Along the length of the cell, the distance between the second wall and the positive electrode is L1, and the size of the separator is L2, where L2 > L1.

7. The battery according to claim 1, characterized in that, Along the length of the battery cell, the size of the separator is L2, and the size of the negative electrode protruding from one end relative to the positive electrode is L3, where L2 > L3.

8. The battery according to claim 1, characterized in that, The housing includes a heat-sealing layer, a metal layer, and an outer layer stacked together, and the heat-sealing layer is provided with the groove.

9. The battery according to claim 1, characterized in that, The housing includes a heat-sealing layer, a metal layer, and an outer layer stacked together, wherein the heat-sealing layer and the metal layer together define the groove.

10. Electrical equipment, characterized in that, Includes the battery as described in any one of claims 1 to 9.

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