Battery and power battery system

Abstract

The utility model discloses a battery and a power battery system, and relates to the technical field of batteries, the battery and power battery system comprises an insulating film, the insulating film covers the peripheral side of a battery cell, and the insulating film extends out of the battery cell towards a top cover and is connected with an insulating assembly; moreover, the shortest vertical distance between the insulating film and the top cover in the length direction is h1, the shortest vertical distance between the insulating film and the overlapping region of the insulating film and the insulating assembly in the length direction is h2, and the parameters meet a preset relationship, so that the battery and the power battery system can avoid the conditions of explosion point and welding failure of the insulating film caused by welding of the top cover; the connection strength of the insulating film and the insulating assembly is ensured, and the condition of battery short circuit caused by lap joint of the battery core and the shell is avoided.

Description

Technical Field

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

[0002] A power battery is a type of battery that provides power to tools. It generally includes a metal casing, a battery cell housed inside the metal casing, and a top cover assembly fixed to the top of the metal casing. The outer periphery of the battery cell is usually covered with a Mylar film to prevent the battery cell from contacting the metal casing and causing a short circuit.

[0003] Currently, top cover assemblies typically consist of a top cover and terminals connected to it. The top cover is connected to an insulating component that mates with the battery cell. The Mylar membrane is welded to the insulating component to fix its position. However, the end of the Mylar membrane facing the top cover extends beyond the end of the battery cell, causing this end to be very close to, or even in contact with, the top cover. This makes it easy to accidentally damage the Mylar membrane during laser welding of the top cover, leading to defects such as chipping and poor welding. Furthermore, because the Mylar membrane is so close to the top cover, the heat generated during laser welding can easily be transferred to it, causing it to shrink. If the shrinkage is excessive, the battery cell may be exposed, leading to insulation failure between the cell and the metal casing, resulting in cell-to-metal contact and a short circuit. Utility Model Content

[0004] The purpose of this invention is to provide a battery and power battery system that, by adjusting the installation position of the insulating film, ensures that the insulating film can cover the battery cell, thereby solving problems such as poor welding of the insulating film and insulation failure that are easily caused by existing battery structures.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A battery comprising:

[0007] An outer casing, wherein an accommodating space is provided inside the outer casing;

[0008] A top cover, which is mounted on the housing to isolate the accommodating space from the external environment;

[0009] A battery cell, wherein the battery cell is disposed within the accommodating space;

[0010] An insulating component is disposed between the top cover and the battery cell;

[0011] An insulating film covers the outer periphery of the battery cell and extends toward the top cover to the outside of the battery cell, connecting with the insulating assembly; and...

[0012] The shortest vertical distance in the longitudinal direction between the insulating film and the top cover is: The shortest vertical distance along the length of the overlapping area between the insulating film and the insulating component is... And the above parameters satisfy: 0.1 .

[0013] Based on the aforementioned battery, this application also provides a power battery system, which includes a busbar and at least two of the aforementioned batteries, wherein the busbar is electrically connected to the two of the aforementioned batteries.

[0014] Compared with the prior art, the battery and power battery system of this application have the following advantages:

[0015] The battery and power battery system of this application adjusts the distance between the insulating film and the top cover to ensure an appropriate gap, thus avoiding situations where the distance between the insulating film and the top cover is too small, thereby preventing the insulating film from exploding or failing due to welding of the top cover. Furthermore, the battery and power battery system adjusts the mating dimensions between the insulating film and the insulating components to ensure sufficient connection area between the insulating film and the insulating components, ensuring the connection strength between the insulating film and the insulating components. Moreover, the mating dimensions between the insulating film and the insulating components also affect the mating dimensions between the insulating film and the battery. By adjusting the mating dimensions between the insulating film and the insulating components, even if the insulating film shrinks due to heat generated by welding of the top cover, the insulating film will not expose the battery cell, thereby preventing the battery cell from overlapping with the casing and causing a short circuit. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the battery in an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the outer casing in an embodiment of this application;

[0018] Figure 3 This is a cross-sectional schematic diagram of the battery in an embodiment of this application;

[0019] Figure 4 yes Figure 3 Enlarged view of A in the middle;

[0020] Figure 5 yes Figure 4 Enlarged view of B in the middle;

[0021] Figure 6 This is a schematic axial cross-sectional view of the battery cell and the cover in an embodiment of this application;

[0022] Figure 7 yes Figure 6 Enlarged view of C in the middle;

[0023] Figure 8 This is a schematic diagram showing the distribution of the connecting and overlapping regions in the embodiments of this application.

[0024] In the diagram, 100 represents the battery; X represents the first direction; Y represents the second direction; Z represents the third direction; 1 represents the outer casing; 1a represents the first end; 1b represents the second end; 2 represents the opening; 3 represents the top cover; 4 represents the battery cell; 5 represents the first insulating component; 6 represents the second insulating component; 7 represents the terminal post; 8 represents the insulating film; 9 represents the overlapping area; and 10 represents the connection area. Detailed Implementation

[0025] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0026] In the description of this utility model, it should be understood that when an element is referred to as "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to or indirectly connected to the other element. The terms "mounted," "connected," and "attached" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0027] In the description of this utility model, it should be understood that the terms "height," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used to indicate the orientation or positional relationship are 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.

[0028] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0029] Example

[0030] refer to Figure 1-8 This application provides a battery 100, which includes a housing 1. The outer contour of the housing 1 is a cuboid columnar structure. The interior of the housing 1 is an accommodating space (not shown in the figure). The housing 1 has openings 2 at both ends in its length direction so that the accommodating space of the housing 1 is connected to the external space.

[0031] It should be noted that the outer casing 1 is typically used to encapsulate components such as the battery cell and electrolyte. In different battery structures, the outer casing 1 may have different shapes and sizes; for example, it can be rectangular, cylindrical, hexagonal prism, etc. Of course, the shape of the outer casing 1 can also be determined according to the specific shape and size of the battery cell. Furthermore, in different battery structures, the material of the outer casing 1 can also be various, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0032] In this embodiment, the outer casing 1 has a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other. The direction in which the two openings 2 of the outer casing 1 are located is the first direction X of the battery 100, that is, the length direction. One end of the outer casing 1 with one opening 2 is the first end 1a of the outer casing 1, and the other end of the outer casing 1 with the other opening 2 is the second end 1b of the outer casing 1. The direction in which the long side of the opening 2 is located is the second direction Y of the battery 100, that is, the width direction. The direction in which the short side of the opening 2 is located is the third direction Z of the battery 100, that is, the thickness direction.

[0033] refer to Figure 1-7 The battery 100 of this embodiment also includes a top cover 3, which is mounted on the first end 1a of the outer casing 1 and extends along the second direction Y. A terminal post 7 is provided on the top cover 3, extending into the interior of the outer casing 1. In the battery 100 of this embodiment, the top cover 3 can be made of a material with a certain hardness and strength (such as aluminum alloy), and it covers the opening 2 of the outer casing 1 to isolate the accommodating space from the external environment. The shape of the top cover 3 generally matches the shape of the outer casing 1 so that the top cover 3 and the outer casing 1 can fit together to isolate the accommodating space from the external environment.

[0034] refer to Figure 1-7The battery 100 in this embodiment also includes a battery cell 4, which is disposed within the casing 1 and electrically connected to the terminal post 7. It is understood that the battery cell 4 is the basic unit of the battery 100, typically used for storing and releasing electrical energy. To achieve this function, the battery cell 4 typically includes a cell body and a tab assembly. The cell body includes a separator and two types of electrodes with opposite polarities, namely a positive electrode and a negative electrode. The cell body operates by the movement of metal ions between the positive and negative electrodes. The cycling process of the battery cell 4 is the process of metal ions moving from the positive electrode to the negative electrode and then from the negative electrode to the positive electrode. The tab assembly includes a positive tab and a negative tab, wherein the positive tab is electrically connected to the positive electrode and the negative tab is electrically connected to the negative electrode. The battery cell 4 achieves charging and discharging through the positive and negative tabs. The separator acts as an insulating layer to prevent short circuits inside the battery caused by contact between the positive and negative electrodes. It also acts as a semi-permeable layer to prevent larger molecules from passing through while allowing smaller charged ions to pass through.

[0035] Positive and negative electrodes are primarily used for loading and transporting active materials. An electrode typically consists of a current collector and an active material layer, with the active material layer coated on the surface of the current collector. If the electrode is a positive electrode, the current collector can be made of aluminum, and the active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. If the electrode is a negative electrode, the current collector can be made of copper, and the active material layer can be made of carbon or silicon, etc.

[0036] refer to Figure 1-7 The battery 100 of this embodiment also includes a first insulating member 5 and a second insulating member 6. The first insulating member 5 and the second insulating member 6 constitute the insulating assembly of the battery 100. The first insulating member 5 is disposed between the top cover 3 and the cell 4 and is connected to the end of the top cover 3 facing the cell 4. The first insulating member 5 covers the outer periphery of the terminal post 7 to form an electrical isolation structure between the outer casing 1 and the terminal post 7. The second insulating member 6 is also disposed between the top cover 3 and the cell 4 and is connected to the end of the cell 4 facing the top cover 3. The second insulating member 6 is located outside the first insulating member 5, and the first insulating member 5 is connected to the interior of the second insulating member 6 so that the two are connected and fixed.

[0037] It should be noted that the first insulating member 5 and the second insulating member 6 are merely examples used in this embodiment to illustrate the structure of the insulating component. The construction of the insulating component is not limited to the combination of the first insulating member 5 and the second insulating member 6. Any insulating structure that can form an electrical isolation structure between the cell 4 and the top cover 3 can be used as the insulating component of the battery 100 in this embodiment. For example, the material of the insulating component can be plastic, rubber, etc.

[0038] refer to Figure 4-5An insulating film 8 covers the outer periphery of the battery cell 4. The insulating film 8 extends along the first direction X toward the first end 1a to the outside of the battery cell 4, separating the battery cell 4 from the outer casing 1. It is understood that the insulating component is disposed between the battery cell 4 and the top cover 3. Therefore, after the insulating film 8 extends along the first direction X toward the first end 1a to the outside of the battery cell 4, it will reach the area where the insulating component is arranged. Thus, there will be a partial overlap 9 between the insulating film 8 and the insulating component in the first direction X. Specifically, in this embodiment, the insulating film 8 and the second insulating member 6 have an overlap 9 in the first direction X, and the shortest vertical distance of this overlap 9 in the first direction X is... Furthermore, there is a certain distance between the end of the insulating film 8 facing the top cover 3 and the end of the top cover 3 facing the battery cell 4 in the first direction X. In this embodiment, this distance is defined as the shortest vertical distance between the insulating film 8 and the top cover 3 in the length direction. And the above parameters satisfy:

[0039] ... (1)

[0040] For example, the shortest vertical distance in the length direction between the insulating film 8 and the top cover 3. The shortest vertical distance in the length direction between the overlapping area 8 of the insulating film and the insulating component 9. The ratio of the two based on formula (1) can be one of the following values: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9.

[0041] It should be noted that, due to the influence of the manufacturing process, in some battery 100 structures, the outer contours of the insulating film 8, top cover 3, and insulating components are not flush, resulting in burrs, flash, or other defects. Therefore, in these battery 100 structures, adjusting the shortest vertical distance in the length direction between the insulating film 8 and the top cover 3 is necessary. The shortest vertical distance in the length direction between the overlapping area 8 of the insulating film and the insulating component 9. When adjusting the spacing, areas with burrs, flash, or other defects caused by differences in the manufacturing process should not be included.

[0042] It should be noted that the partial overlap 9 between the insulating film 8 and the insulating component in the first direction X does not necessarily mean that the insulating film 8 and the insulating component are directly connected. For example, in some battery 100 structures, the insulating film 8 is a Mylar film, and the insulating film 8 and the second insulating component 6 are connected and fixed by heat fusion. In this case, the insulating film 8 and the second insulating component 6 are directly bonded together, having a direct connection. However, in some battery 100 structures, the insulating film 8 can also be connected and fixed to the insulating component by adhesive. In this type of battery 100 structure, the insulating film 8 and the insulating component are not directly connected, but there is still a partial overlap 9 between the insulating film 8 and the insulating component in the first direction X, that is, the projections of the insulating film 8 and the insulating component in the third direction Z partially overlap.

[0043] It is understandable that the shortest vertical distance in the length direction between the insulating film 8 and the top cover 3 is... The shortest vertical distance in the length direction between the overlapping area 8 of the insulating film and the insulating component 9. These two factors reflect the fit between the insulating film 8, the battery cell 4, and the top cover 3. If the ratio of these two factors is too small, the welding torch may easily touch the insulating film 8 during the welding of the top cover 3, causing a puncture and affecting the welding quality. This can lead to insufficient connection strength between the top cover 3 and the outer casing 1, making the top cover 3 prone to shaking and affecting the overlap between the tabs and the outer casing 1, resulting in a short circuit in the battery 100. Furthermore, if the welding torch punctures the insulating film 8, it will cause the insulating film 8 to fail, leading to leakage of the battery cell 4 and a short circuit in the battery 100. If the ratio of these two factors is too large, the connection strength between the insulating film 8 and the insulating components may be insufficient, making it easier for the insulating film 8 to separate from the insulating components. Moreover, during the welding of the top cover 3, the heat generated during welding will be transferred to the insulating film 8, causing it to shrink due to heat. After shrinking due to heat, the insulating film 8 may shrink into the area where the battery cell 4 is located, which can also lead to leakage of the battery cell 4 and a short circuit in the battery 100.

[0044] Therefore, in this embodiment, the battery 100, by adjusting the spacing between the insulating film 8 and the top cover 3, and the fitting dimensions between the insulating film 8 and the insulating assembly, achieves the shortest vertical distance in the length direction between the insulating film 8 and the top cover 3. The shortest vertical distance in the length direction between the overlapping area 8 of the insulating film and the insulating component 9. The ratio of the two based on formula (1) is in the range of 0.1 to 0.9, so that the insulating film 8 and the top cover 3 can be spaced at an appropriate distance to avoid the spacing between the insulating film 8 and the top cover 3 being too small, thereby avoiding the situation where the insulating film 8 explodes or fails due to the welding of the top cover 3. In addition, the insulating film 8 and the insulating component have sufficient connection area to ensure the connection strength between the insulating film 8 and the insulating component. Even if the insulating film 8 shrinks due to the heat generated by the welding of the top cover 3, the insulating film 8 will not expose the battery cell 4, thereby avoiding the battery cell 4 from overlapping with the casing and causing the battery 100 to short circuit.

[0045] It is understandable that the internal structure of batteries 100 of different specifications will vary, which usually leads to changes in the spacing between the insulating film 8, the top cover 3, and the cell 4, thus affecting... and The value. Therefore and The value is usually taken within a suitable range to meet the assembly requirements of batteries of different specifications.

[0046] For example, as an example of this embodiment, the shortest vertical distance in the length direction between the insulating film 8 and the top cover 3 is... Within a range of 1 to 10 mm, sufficient spacing can be maintained between the insulating film 8 and the top cover 3 to prevent the welding torch from touching the insulating film 8 during welding of the top cover 3, causing a blowout and affecting the welding quality. This could lead to insufficient connection strength between the top cover 3 and the outer shell 1, causing the top cover 3 to wobble easily, affecting the overlap between the tabs and the outer shell 1, causing a short circuit in the battery 100, or puncturing the insulating film 8, causing the insulating film 8 to fail, which could lead to leakage of the battery cell 4 and a short circuit in the battery 100.

[0047] For example, the shortest vertical distance in the length direction between the insulating film 8 and the top cover 3. You can select one of the following values: 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0048] Of course, the shortest vertical distance along the length direction can also be adjusted by the overlapping area 9 of the insulating film 8 and the insulating component. The value of which makes the shortest vertical distance in the length direction between the insulating film 8 and the top cover 3 the minimum distance between them. The shortest vertical distance in the length direction between the overlapping area 8 of the insulating film and the insulating component 9. The two are matched. For example, the shortest vertical distance in the length direction between the overlapping area 9 of the insulating film 8 and the insulating component. Within the range of 1 to 10 mm, sufficient connection area is ensured between the insulating film 8 and the insulating component, ensuring the connection strength between the insulating film 8 and the insulating component, ensuring a tight connection between the insulating film 8 and the insulating component, and preventing shrinkage to the area where the cell 4 is located due to welding heat, which could lead to leakage of the cell 4 and cause the battery 100 to open circuit.

[0049] For example, the shortest vertical distance in the length direction between the overlapping area 9 of the insulating film 8 and the insulating component. You can select one of the following values: 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0050] Understandably, in some battery structures 100, the insulating film 8 is a Mylar film, and the insulating film 8 is connected and fixed to the second insulating component 6 by heat fusion. Therefore, after the insulating film 8 and the second insulating component 6 are connected and fixed, several heat-fused areas will be formed between the insulating film 8 and the second insulating component 6. These heat-fused areas, as connection areas 10, are the connection points between the insulating film 8 and the second insulating component 6, affecting the connection strength between the insulating film 8 and the second insulating component 6.

[0051] refer to Figure 8 The connecting area 10 is located within the overlapping area 9 of the insulating film 8 and the insulating component, at the end of the insulating film 8 facing the top cover 3. Therefore, during the welding of the top cover 3, the connecting area 10 is more susceptible to shrinkage and deformation due to the heat generated during welding. To ensure the connection strength between the insulating film 8 and the second insulating component 6, it is appropriate to maintain a certain distance between the connecting area 10 and the top cover 3. However, if the distance between the connecting area 10 and the top cover 3 is too great, it will compress the arrangement space of the connecting area 10, resulting in an insufficient area of ​​the connecting area 10, which in turn leads to insufficient connection strength between the insulating film 8 and the second insulating component 6. Therefore, the shortest vertical distance in the length direction between the connecting area 10 and the top cover 3 is... It should be controlled within a suitable range. As an example of this embodiment, the shortest vertical distance in the length direction between the connecting area 10 and the top cover 3 is... Within the range of 2 to 18 mm, ensure that the connection area between the insulating film 8 and the insulating component is within a suitable range, so that the connection between the insulating film 8 and the second insulating component 6 is stable, and avoid the connection area 10 being too close to the welding position, which would affect the stability of the connection between the insulating film 8 and the second insulating component 6.

[0052] For example, the shortest vertical distance in the length direction between the connecting area 10 and the top cover 3. You can select one of the following sizes: 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, or 18mm.

[0053] It should be noted that the insulating component is located between the battery cell 4 and the top cover 3, and is usually adapted to the end of the battery cell 4. Therefore, the insulating film 8 covers the outer periphery of the battery cell 4 and is also arranged around the insulating component. In this way, the connection area 10 formed by the interconnection of the insulating film 8 and the insulating component is often arranged along the outer periphery of the battery cell 4 to ensure that the insulating film 8 and the second insulating component 6 are firmly connected.

[0054] Furthermore, to ensure the connection strength between the insulating film 8 and the second insulating element 6, the connection area 10 is typically an elongated region. It is understood that if the connection area 10 occupies an insufficient proportion within the overlapping area 9, it can easily affect the connection strength between the insulating film 8 and the second insulating element 6; conversely, if the connection area 10 occupies an excessive proportion within the overlapping area 9, the insulation 8 is prone to tearing. Therefore, to ensure that the connection area 10 occupies a certain proportion within the overlapping area 9, and that the area of ​​the connection area 10 is sufficient to meet the connection requirements between the insulating film 8 and the second insulating element 6, as an example of this embodiment, the total area of ​​the overlapping area 9 is... The total area of ​​connected region 10 is And the above parameters satisfy: For example, the total area of ​​overlapping region 9 is The total area of ​​connecting region 10 is The ratio between the two can be one of the following values: 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, or 0.8.

[0055] Of course, in this example, the total area of ​​overlapping region 9 is adjusted to... The total area of ​​connecting region 10 is The ratio of the two ensures that the connection strength between the insulating film 8 and the second insulating component 6 meets the connection requirements. Therefore, in this example of the battery 100 structure, the area of ​​the overlap region 9 between the insulating film 8 and the insulating component can be smaller than in other battery 100 structures. The shortest vertical distance in the length direction between the insulating film 8 and the top cover 3 is... The shortest vertical distance in the length direction between the overlapping area 8 of the insulating film and the insulating component 9. It can be satisfied:

[0056] ,……(2)

[0057] This also enables the battery 100 structure in this example to achieve the following: a suitable distance between the insulating film 8 and the top cover 3, so as to avoid the insulating film 8 being too small, thereby avoiding the situation where the insulating film 8 explodes or fails due to the welding of the top cover 3. In addition, the insulating film 8 and the insulating component have sufficient connection area to ensure the connection strength between the insulating film 8 and the insulating component. Even if the insulating film 8 shrinks due to the heat generated by the welding of the top cover 3, the insulating film 8 will not expose the battery cell 4, thereby avoiding the battery cell 4 from overlapping with the casing and causing a short circuit in the battery 100.

[0058] For example, the shortest vertical distance in the length direction between the insulating film 8 and the top cover 3. The shortest vertical distance in the length direction between the overlapping area 8 of the insulating film and the insulating component 9. The ratio of the two based on formula (2) can be one of the following values: 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9.

[0059] It is understandable that the connection area 10 within the overlapping area 9 can be arranged continuously or intermittently. Taking hot-melt welding as an example, the welding torch can move continuously along the outer periphery of the battery cell 4, thereby forming a continuously extending connection area 10 within the overlapping area 9. The welding torch can also move intermittently along the outer periphery of the battery cell 4, thereby forming spaced connection areas 10 within the overlapping area 9. In this case, refer to... Figure 8 There are multiple connection areas 10, which are arranged at intervals within the overlapping area 9. In the case of multiple connection areas 10 arranged within the overlapping area 9, to avoid mutual interference between adjacent connection areas 10 and affecting the welding quality, the spacing between two adjacent connection areas 10 in the outer circumferential direction of the battery 100 is L, and L is within the range of 0.5 to 60 mm. This ensures that the spacing between adjacent connection areas 10 is appropriate, thereby ensuring a uniform distribution of the connection position between the insulating film 8 and the second insulating component 6, and avoiding stress concentration in localized areas of the insulating film 8 that could lead to tearing.

[0060] For example, the distance L between two adjacent connection regions 10 in the outer periphery direction of the battery 100 can be one of the following values: 0.5mm, 0.6mm, 1mm, 10mm, 20mm, 30mm, 40mm, 50mm, 55mm, and 60mm.

[0061] Based on the aforementioned battery 100, this embodiment also provides a power battery system, which includes a busbar and at least two of the aforementioned batteries 100, wherein the busbar is electrically connected to the terminals 7 of the two batteries 100. Since this power battery system possesses any of the aforementioned batteries 100, it also possesses the advantages of the aforementioned batteries 100.

[0062] In summary, the embodiments of this application provide a battery 100 and a power battery system. By adjusting the distance between the insulating film 8 and the top cover 3, a suitable distance is maintained between the insulating film 8 and the top cover 3 to avoid the insulating film 8 becoming too small, thus preventing the welding of the top cover 3 from causing explosions or welding failures. Furthermore, by adjusting the mating dimensions between the insulating film 8 and the insulating components, the battery 100 and the power battery system ensure sufficient connection area between the insulating film 8 and the insulating components, guaranteeing the connection strength between the insulating film 8 and the insulating components. Moreover, the mating dimensions between the insulating film 8 and the insulating components also affect the mating dimensions between the insulating film 8 and the battery 100. By adjusting the mating dimensions between the insulating film 8 and the insulating components, even if the insulating film 8 shrinks due to heat generated by the welding of the top cover 3, the insulating film 8 will not expose the battery cell 4, thereby preventing the battery cell 4 from overlapping with the casing and causing a short circuit in the battery 100.

[0063] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery, characterized in that, include: An outer casing, wherein an accommodating space is provided inside the outer casing; A top cover, which is mounted on the housing to isolate the accommodating space from the external environment; A battery cell, wherein the battery cell is disposed within the accommodating space; An insulating component is disposed between the top cover and the battery cell; An insulating film covers the outer periphery of the battery cell and extends toward the top cover to the outside of the battery cell, connecting with the insulating assembly; and... The shortest vertical distance in the length direction between the insulating film and the top cover is h1, and the shortest vertical distance in the length direction between the overlapping areas of the insulating film and the insulating component is h2, and the above parameters satisfy:

2. The battery according to claim 1, characterized in that, The shortest vertical distance h1 between the insulating film and the top cover in the length direction is in the range of 1 to 10 mm.

3. The battery according to claim 1, characterized in that, The shortest vertical distance h2 in the length direction between the overlapping area of ​​the insulating film and the insulating component is in the range of 1 to 10 mm.

4. The battery according to claim 1, characterized in that, The insulating film and the insulating component are interconnected to form a connection area. The shortest vertical distance between the connection area and the top cover in the length direction is h3, and h3 is in the range of 2 to 18 mm.

5. The battery according to claim 4, characterized in that, The connection area is an elongated strip-shaped area, and the connection area extends along the outer periphery of the battery cell.

6. The battery according to claim 4, characterized in that, The number of connection regions is multiple, and the multiple connection regions are arranged at intervals within the overlapping area.

7. The battery according to claim 4, characterized in that, The total area of ​​the overlapping region is S1, the total area of ​​the connecting region is S2, and the above parameters satisfy:

8. The battery according to any one of claims 5-7, characterized in that, The shortest vertical distance h1 in the length direction between the insulating film and the top cover, and the shortest vertical distance h2 in the length direction between the overlapping areas of the insulating film and the insulating component, satisfy the following:

9. The battery according to claim 8, characterized in that, The distance between two adjacent connection regions in the outer peripheral direction of the battery is L, and L is in the range of 0.5 to 60 mm.

10. A power battery system, characterized in that, It includes a bus and at least two batteries as described in any one of claims 1-9, wherein the bus is electrically connected to the two batteries.

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