Battery structure and battery pack

Abstract

The utility model discloses a battery structure and a battery pack, the battery structure comprises a battery core assembly, and the battery core assembly comprises a battery core and a tab; the tab comprises a first section and a second section, the first section extends out of the electrical output end along the first direction, the second section is bent relative to the first section and extends along the second direction, the second section and the electrical output end are arranged at an interval, and an insertion interval is formed; and the protection plate is inserted into the insertion interval along the second direction and is clamped between the tab and the periphery of the battery cell, and the protection plate is electrically connected with the tab. The battery pack comprises the battery structure. The second sections of the tabs are bent to form the insertion intervals with the peripheries of the battery cells, and the protection plates are vertically inserted into the insertion intervals, so that the sizes of the battery cells in the plane direction are more compact, the occupied space of the whole battery cells in the battery pack is reduced, more battery cells can be placed in the same shell space of the battery pack, and the service life of the battery pack is prolonged. The capacity and voltage of the battery pack can be improved.

Description

Technical Field

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

[0002] A battery pack is an integrated battery system based on cells, typically containing multiple cells. These cells can be of the same type, such as lithium-ion cells. By connecting multiple cells in series or parallel, the capacity or voltage of the battery pack can be increased. Before connecting individual cells, a certain space (such as a groove) is usually reserved to install a protection board (PCM) to control the battery's input and output. Traditionally, the protection board is bent and pressed flat into the groove on the cell, causing the outer periphery of the protection board to protrude beyond the cell. Because the protection board protrudes, the actual space occupied by each cell increases. Within the limited space of the battery pack casing, the number of cells that can be placed decreases, and the total capacity or voltage of the battery pack will decrease accordingly, making it difficult to meet market demands.

[0003] At the same time, because the size and specifications of the battery pack are specified during the product design stage, if the protection board protrudes and causes the size of the assembled battery cell to exceed the design specifications, it will not meet the product requirements and will need to be reworked, increasing production time and reducing production efficiency. Utility Model Content

[0004] In order to overcome at least one of the defects described in the prior art, the present invention provides a battery structure and battery pack, wherein after the protection board is assembled with the battery cell, the actual space occupied by the battery cell is small, so that more battery cells can be placed in the limited space of the battery pack casing, thereby increasing the battery pack capacity and reducing the probability of rework.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] A battery structure comprising:

[0007] A battery cell assembly, comprising a battery cell and a tab, wherein the battery cell has an electrical output terminal; the tab comprises a first segment and a second segment, the first segment extending out of the electrical output terminal along a first direction, the second segment being bent relative to the first segment and extending along a second direction, the second segment being spaced apart from the electrical output terminal and forming an insertion gap;

[0008] A protection plate is inserted into the insertion interval along the second direction and clamped between the electrode tab and the outer periphery of the battery cell. The protection plate is electrically connected to the electrode tab.

[0009] Furthermore, the sidewall of the insertion interval has an adhesive layer, which is bonded to the outer periphery of the battery cell, and one side of the protection plate is bonded to the battery cell via the adhesive layer.

[0010] Furthermore, a rubber plate is provided in the insertion interval. The rubber plate is inserted vertically into the insertion interval and is located between the protective plate and the electrode tab. The other side of the protective plate is bonded to the electrode tab via the rubber plate.

[0011] Furthermore, the electrode also includes a third section, which is connected to the second section and bent toward the inside of the insertion interval. After bending, the third section and the second section are spaced apart to form a snap-fit ​​groove, and the rubber plate is snapped into the snap-fit ​​groove.

[0012] Furthermore, double-sided adhesive tape is provided on both sides of the adhesive plate, and the double-sided adhesive tape is bonded to the protective plate and the electrode tab respectively.

[0013] Furthermore, an insulating adhesive layer is provided on the outer periphery of the electrical output terminal, and the insulating adhesive layer covers the insertion interval.

[0014] Furthermore, the insulating adhesive layer includes a first insulating adhesive paper, which covers the outer periphery of the electrical output terminal.

[0015] Furthermore, a second insulating paper is provided on both sides of the battery cell, and the second insulating paper is respectively wrapped around both sides of the battery cell.

[0016] Furthermore, it also includes an output terminal that extends into the insertion gap and is electrically connected to the protection board.

[0017] A battery pack, comprising the aforementioned battery structure.

[0018] In summary, the battery structure and battery pack provided by this utility model have the following technical effects: by bending the second section of the tab relative to the first section, the second section forms an insertion gap with the outer periphery of the cell. The protection plate can be inserted into the insertion gap along the second direction (i.e., the vertical direction), changing the installation direction of the protection plate. This makes the cell size more compact in the planar direction, avoiding the probability of the protection plate protruding from the edge of the cell due to flat pressure. This reduces the overall space occupied by the cell in the battery pack. Thus, more cells can be placed in the same battery pack casing space, which can increase the capacity and voltage of the battery pack, indirectly improving the pass rate of the battery pack and reducing the probability of rework. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0020] Figure 2This is a schematic diagram of the structure of this utility model;

[0021] Figure 3 This is an exploded view of the structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the battery cell structure in this utility model;

[0023] The meanings of the reference numerals in the attached figures are as follows:

[0024] 10. Battery cell; 11. Electrical output terminal; 12. Electrode; 121. Second section; 122. Third section; 123. Snap-on slot; 13. Insertion interval; 14. Adhesive layer; 15. First insulating tape; 16. Second insulating tape; 20. Protection board; 21. Output terminal; 30. Adhesive plate. Detailed Implementation

[0025] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation 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.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0028] Example 1,

[0029] See Figures 1 to 4 This utility model discloses a battery structure, including a cell assembly and a protection plate 20. The cell assembly includes a cell 10 and a tab 12. The cell 10 has an electrical output terminal 11. The tab 12 includes a first segment and a second segment 121. The first segment extends out of the electrical output terminal 11 along a first direction. The second segment 121 is bent relative to the first segment and extends along a second direction. The second segment 121 is spaced apart from the electrical output terminal 11 and forms an insertion space 13. The protection plate 20 is inserted into the insertion space 13 along the second direction and clamped between the tab 12 and the outer periphery of the cell 10. The protection plate 20 is electrically connected to the tab 12.

[0030] Based on the above structure, the first section of the tab 12 is the connection point of the tab 12 to the electrical output terminal 11 (the root of the tab 12), while the second section 121 of the tab 12 is the extension of the tab 12 protruding from the edge of the cell 10 (e.g., Figure 4 As shown in the figure, the following explanation takes the first direction as the horizontal direction and the second direction as the vertical direction as an example. During assembly, the first section of the tab 12 (i.e., the root of the tab 12) is led out along the first direction (horizontal direction), and the second section 121 is bent toward the second direction (i.e., the vertical direction). After the second section 121 is bent, it can form an insertion gap 13 with the outer periphery of the cell 10. Then, the protection plate 20 is inserted vertically (i.e., along the second direction) into the insertion gap 13, so that the protection plate 20 is vertically clamped between the tab 12 and the outer periphery of the cell 10, so as to prevent the protection plate 20 from shifting in the horizontal direction and prevent it from arbitrarily protruding from the edge of the cell 10, so that the size of the cell 10 in the planar direction is more compact.

[0031] Specifically, compared to connecting the protection plate 20 to the tab 12 in a flat pressing manner, which easily causes the protection plate 20 to protrude in the planar direction (length and width) of the battery cell 10, resulting in a relatively large planar space occupied by the battery cell 10 during assembly, in this embodiment, the protection plate 20 is vertically inserted into the insertion interval 13 and clamped between the tab 12 and the outer periphery of the battery cell 10, so that the protection plate 20 is less likely to protrude from the edge of the battery cell 10 in the horizontal direction, thus reducing the horizontal space occupied by the battery cell 10; in addition, the insertion interval 13 is like a customized "slot", and the protection plate 20 is precisely inserted as a "card", with the tab 12 and the outer periphery of the battery cell 10 limiting the position on both sides, thereby ensuring the positional stability of the protection plate 20, making it less likely to shift after installation, and reducing the probability of the protection plate 20 protruding from the edge of the battery cell 10 due to displacement;

[0032] Meanwhile, since the cell 10 usually has a certain amount of space in the vertical direction to accommodate the protection plate 20, inserting the protection plate 20 vertically changes its installation direction. In the vertical direction, the size of the protection plate 20 can better utilize the space that might otherwise be wasted in the height direction of the cell 10, making it less likely for the protection plate 20 to protrude from the edge of the cell 10 in the height direction. Since the protection plate 20 no longer protrudes from the edge of the cell 10, the space occupied by each cell 10 in the battery pack layout is effectively controlled, making the size of the cell 10 more compact in the planar direction. This reduces the overall space occupied by the cell 10 in the battery pack, allowing multiple cells 10 to be arranged more closely. Thus, more cells 10 can be placed in the same battery pack casing space, which can increase the capacity and voltage of the battery pack.

[0033] More specifically, due to the dimensional deviation caused by the protrusion of the protection plate 20, the finished product can easily exceed the designed width and length standards. During the quality inspection of the battery assembly, once dimensional problems such as excessive width or length are found, rework is required. Rework means readjusting the position of the protection plate 20 or modifying the battery pack structure, which increases production costs and processing time. Therefore, after using the battery structure in this embodiment, the protection plate 20 is less likely to protrude from the outer periphery of the battery cell 10 after assembly with the battery cell 10, so that the overall space occupied by the battery cell 10 is effectively controlled, indirectly reducing the probability of rework and improving production efficiency.

[0034] Furthermore, an adhesive layer 14 is provided on the sidewall of the insertion interval 13. The adhesive layer 14 is bonded to the outer periphery of the battery cell 10, and one side of the protection plate 20 is bonded to the battery cell 10 via the adhesive layer 14.

[0035] Specifically, by having an adhesive layer 14 on the side wall of the insertion interval 13, the protective board 20 can be more firmly connected to the outer periphery of the battery cell 10 through the adhesive layer 14 after being inserted into the insertion interval 13, making it less prone to loosening. This reduces the probability of the protective board 20 shifting and protruding from the edge of the battery cell 10, and indirectly reduces the probability of rework caused by the protective board 20 shifting and protruding from the edge of the battery cell 10.

[0036] It should be noted that the adhesive layer 14 can be formed by double-sided adhesive tape or high-temperature tape applied to the outer periphery of the battery cell 10, or by applying a layer of epoxy adhesive or silicone liquid adhesive to the outer periphery of the battery cell 10, so that the protection board 20 can be bonded to the outer periphery of the battery cell 10 after being inserted into the insertion interval 13, resulting in a more stable structure.

[0037] More specifically, a glue plate 30 is provided in the insertion interval 13. During assembly, the glue plate 30 can be placed on the side of the insertion interval 13 away from the glue layer 14. That is, the glue plate 30 is bonded to the tab 12 so that after the protective plate 20 is inserted into the insertion interval 13, both sides of the protective plate 20 can be glued together, making it more stable after installation and less prone to displacement.

[0038] It should be noted that the adhesive sheet 30 can also be formed by double-sided adhesive, or a plate-like structure can be set up with glue or adhesive stickers applied to both sides of the plate to make the adhesive sheet 30 sticky, so as to bond the protective plate 20.

[0039] Preferably, the adhesive plate 30 in this example has double-sided adhesive on both sides, which makes the protective plate 20 and the tab 12 more firmly bonded.

[0040] Furthermore, the tab 12 also includes a third segment 122, which is connected to the second segment 121 and bent toward the inside of the insertion interval 13. After the third segment 122 is bent, it forms a snap-fit ​​groove 123 with the second segment 121 at intervals, and the rubber plate 30 is snapped into the snap-fit ​​groove 123.

[0041] Specifically, the adhesive plate 30 is snapped into the snap-fit ​​groove 123 formed by the interval between the third section 122 and the second section 121. After the protection plate 20 and the adhesive plate 30 are bonded together, the protective plate 20 can be more firmly fixed in the insertion interval 13 due to the stable position of the adhesive plate 30, providing a more stable foundation for the connection between the protection plate 20 and the battery cell 10.

[0042] Furthermore, an insulating adhesive layer is provided on the outer periphery of the electrical output terminal 11, which covers the insertion interval 13.

[0043] Specifically, during assembly, after the protection board 20 is inserted into the insertion interval 13, in order to prevent current leakage at the outer periphery of the connection between the protection board 20 and the battery cell 10, this embodiment also provides an insulating adhesive layer on the outer periphery of the electrical output terminal 11 to reduce the probability of current leakage and improve the safety performance of the battery cell 10.

[0044] It should be noted that the insulating adhesive layer can be adhesive paper covering the outer periphery of the electrical output terminal 11. For example, a layer of high-temperature adhesive, such as silicone high-temperature adhesive, polyimide high-temperature adhesive, or inorganic high-temperature adhesive, can be applied to the adhesive paper when it is in a liquid state. Then, it can be wrapped around the outer periphery of the electrical output terminal 11. After the adhesive solidifies, it can adhere to the outside of the electrical output terminal 11 to cover the insertion space 13 and achieve insulation. Of course, liquid high-temperature adhesive can also be directly applied to the outer periphery of the electrical output terminal 11. After it solidifies, an insulating adhesive layer can also be formed on the outer periphery of the electrical output terminal 11.

[0045] Preferably, the insulating adhesive layer in this embodiment includes a first insulating adhesive paper 15. During assembly, the first insulating adhesive paper 15 is used to cover the outer periphery of the electrical output terminal 11. Specifically, the first insulating adhesive paper 15 can be an insulating adhesive paper such as epoxy resin or silicone.

[0046] More specifically, in order to further reduce the risk of internal current leakage of the battery cell 10, a second insulating adhesive paper 16 is provided on both sides of the battery cell 10. The second insulating adhesive paper 16 covers both sides of the battery cell 10. Similarly, the second insulating adhesive paper 16 can also be an existing epoxy adhesive or silicone adhesive paper with insulating properties.

[0047] In addition, in order to effectively output the electrical energy inside the battery cell 10, this embodiment also provides an output terminal 21. The output terminal 21 is an FPC (flexible printed circuit board) and is connected to the protection board 20 within the insertion and mounting interval 13. This can effectively transmit various signals inside the battery to external devices and provide a stable interface for the battery's electrical energy output.

[0048] Example 2,

[0049] A battery pack, comprising the battery structure of Example 1.

[0050] Based on the above structure, the battery pack in this embodiment is composed of multiple batteries containing the battery structure in Embodiment 1. Since the space occupied by each cell 10 is effectively controlled, the size of the cell 10 in the planar direction is more compact, reducing the overall space occupied by the cell 10 in the battery pack. This allows multiple cells 10 to be arranged more closely, so that more cells 10 can be placed in the same battery pack casing space to improve the capacity and voltage of the entire battery pack.

[0051] More specifically, because the protection board 20 does not easily protrude from the outer periphery of the battery cell 10 after being assembled with the battery cell 10, the overall space occupied by the battery cell 10 is effectively controlled, which indirectly reduces the probability of rework in the later stage and improves production efficiency.

[0052] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A battery structure, characterized in that, include: A battery cell assembly, comprising a battery cell and a tab, wherein the battery cell has an electrical output terminal; the tab comprises a first segment and a second segment, the first segment extending out of the electrical output terminal along a first direction, the second segment being bent relative to the first segment and extending along a second direction, the second segment being spaced apart from the electrical output terminal and forming an insertion gap; A protection plate is inserted into the insertion interval along the second direction and clamped between the electrode tab and the outer periphery of the battery cell. The protection plate is electrically connected to the electrode tab.

2. The battery structure as described in claim 1, characterized in that, The sidewall of the insertion interval has an adhesive layer, which is bonded to the outer periphery of the battery cell, and one side of the protection plate is bonded to the battery cell via the adhesive layer.

3. The battery structure as described in claim 2, characterized in that, The insertion interval is also provided with a rubber plate, which is inserted vertically into the insertion interval and located between the protective plate and the electrode tab. The other side of the protective plate is bonded to the electrode tab via the rubber plate.

4. The battery structure as described in claim 3, characterized in that, The electrode also includes a third section, which is connected to the second section and bent toward the inside of the insertion interval. After bending, the third section and the second section are spaced apart to form a snap-fit ​​groove, and the rubber plate is snapped into the snap-fit ​​groove.

5. The battery structure as described in claim 3, characterized in that, The adhesive plate has double-sided adhesive tape on both sides, which is bonded to the protective plate and the electrode tab respectively.

6. The battery structure according to any one of claims 1-5, characterized in that, An insulating adhesive layer is also provided on the outer periphery of the electrical output terminal, and the insulating adhesive layer covers the insertion interval.

7. The battery structure as described in claim 6, characterized in that, The insulating adhesive layer includes a first insulating adhesive paper, which covers the outer periphery of the electrical output terminal.

8. The battery structure according to any one of claims 1-5, characterized in that, The battery cell has a second insulating paper on both sides, and the second insulating paper covers both sides of the battery cell respectively.

9. The battery structure according to any one of claims 1-5, characterized in that, It also includes an output terminal that extends into the insertion gap and is electrically connected to the protection board.

10. A battery pack, characterized in that, Includes the battery structure as described in any one of claims 1-9.

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