Battery case and battery

Abstract

The present invention provides a battery case and a battery, which relate to the field of battery technology. The battery case includes a shell body, a welding component and a reinforcing component, the two ends of the shell body are connected by the welding component, the shell body encloses a accommodating space, the reinforcing component and the welding component are located on the same side of the shell body in a first direction, and the reinforcing component protrudes from the inner side wall of the shell body toward the inside of the accommodating space along the first direction. In the battery case of the present invention, the reinforcing component has sufficient strength to support the pole group, thereby preventing the pole group from being scratched. In this way, there is no need to set up an additional side plate, which reduces the manufacturing cost of the battery. At the same time, a gap is formed between the portion of the shell body except for the portion where the reinforcing component is set and the pole group, so that the gas generated by the pole group can be discharged through this gap, reducing the risk of thermal runaway of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery housing and a battery. Background Art

[0002] Lithium-ion power batteries generally include a pole group, a cover plate and a shell; the shell provides a storage space for the pole group, and the cover plate and the shell are welded together to form a closed space, thereby forming a complete battery structure.

[0003] In blade lithium-ion batteries, the shell is usually formed by high-frequency welding or laser welding, and the shell has an open structure on both sides to facilitate welding with the cover plate. In order to prevent the weld from scratching the electrode group, side panels are generally installed inside the shell to support the electrode group. However, the setting of the side panels increases the manufacturing cost of the battery, and the gas generated by the electrode group is not easy to remove, and the risk of thermal runaway of the battery is relatively high. Summary of the invention

[0004] In view of this, the present application provides a battery housing and a battery to solve the problems of increased manufacturing costs of existing batteries and a greater risk of thermal runaway of the battery.

[0005] According to one aspect of the present application, a battery case is provided, the battery case comprising a case body, a welding member and a reinforcing member, the two ends of the case body being connected by the welding member, the case body enclosing a receiving space, the reinforcing member and the welding member being located on the same side of the case body in a first direction, the reinforcing member protruding from the inner side wall of the case body toward the inside of the receiving space along the first direction;

[0006] A ratio of a dimension of the reinforcing member in the first direction to a thickness of the shell is 0.40-3.33.

[0007] Preferably, the dimension of the reinforcing member in the first direction is 0.2 mm-1 mm.

[0008] Preferably, the number of the reinforcing components is two, and the two reinforcing components are respectively located on both sides of the welding component in a second direction, and the second direction is perpendicular to the first direction.

[0009] Preferably, a ratio of a size of the shell body in the second direction to a sum of a size of the reinforcing member in the second direction is 4.00-8.00.

[0010] Preferably, the sum of the dimensions of the reinforcing member in the second direction is 3 mm-8 mm.

[0011] Preferably, the welding component includes a main body, a first welding part and a second welding part, the two ends of the shell body are respectively connected to the two ends of the main body, the first welding part and the second welding part protrude from the main body toward the inside and outside of the accommodating space respectively, and the protruding size of the first welding part relative to the shell body is smaller than the protruding size of the reinforcing component relative to the shell body.

[0012] Preferably, the protruding dimension of the first welding portion relative to the shell body is 0-0.15 mm, and / or the protruding dimension of the second welding portion relative to the shell body is 0-0.5 mm.

[0013] Preferably, a size of the first welding portion in the second direction is 0.5 mm-1 mm, and / or a size of the second welding portion in the second direction is 0.5 mm-1 mm.

[0014] Preferably, the size of the shell body in the first direction is 80mm-150mm, and / or the size of the shell body in the second direction is 12mm-20mm, and / or the size of the shell body in the third direction is 400mm-1000mm, and the third direction is perpendicular to the first direction and the second direction respectively.

[0015] According to another aspect of the present application, a battery is provided, comprising the battery casing as described above.

[0016] In the battery shell of the present application, the reinforcing member and the welding member are located on the same side of the shell body, and the reinforcing member protrudes from the inner side wall of the shell body along the first direction toward the inside of the accommodating space from one side of the accommodating space, and the ratio of the size of the reinforcing member in the first direction to the thickness of the shell is 0.40-3.33, which makes the reinforcing member have sufficient strength to support the pole group, thereby preventing the pole group from being scratched. In this way, there is no need to set up an additional side plate, which reduces the manufacturing cost of the battery. At the same time, a gap is formed between the part of the shell body except for the part where the reinforcing member is set and the pole group, so that the gas generated by the pole group can be discharged through this gap, reducing the risk of thermal runaway of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram showing the three-dimensional structure of a battery housing according to an embodiment of the present invention;

[0019] Figure 2 A cross-sectional view of a battery housing showing an embodiment of the present invention;

[0020] Figure 3 Show Figure 2 A magnified view of part A;

[0021] Figure 4 An exploded view of a battery is shown.

[0022] Icon: 100-shell; 110-shell body; 120-welding component; 121-first welding part; 122-second welding part; 123-main body; 130-reinforcing component; 140-first exhaust channel; 150-second exhaust channel; 160-third exhaust channel; 170-fourth exhaust channel; 200-cover plate; 300-pole group; L1-first direction; L2-second direction; L3-third direction. DETAILED DESCRIPTION

[0023] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0024] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0025] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0026] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0027] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0028] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0029] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0030] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0031] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0032] The following will be combined Figures 1 to 4 The battery housing 100 and the battery of the present invention are described. Figures 1 to 4 In the figure, the first direction L1 is the width direction of the battery, the second direction L2 is the thickness direction of the battery, and the third direction L3 is the length direction of the battery. The first direction L1, the second direction L2 and the third direction L3 are perpendicular to each other.

[0033] According to one aspect of the present application, a battery housing is provided. Figure 1 , Figure 2 and Figure 3 As shown, the battery shell 100 includes a shell body 110, a welding component 120 and a reinforcing component 130. The two ends of the shell body 110 are connected by the welding component 120. The shell body 110 encloses a accommodating space. The reinforcing component 130 and the welding component 120 are located on the same side of the shell body 110 in the first direction L1. The reinforcing component 130 protrudes from the inner side wall of the shell body 110 toward the inside of the accommodating space; the ratio of the protruding size of the reinforcing component 130 from the shell body 100 to the thickness of the shell 100 is 0.40-3.33.

[0034] In the battery shell 100 of the present application, the reinforcing member 130 and the welding member 120 are located on the same side of the shell body 110 in the first direction L1, and the reinforcing member 130 protrudes from the inner side wall of the shell body 110 along the first direction L1 toward the inside of the accommodating space. The ratio of the size of the reinforcing member 130 in the first direction L1 to the thickness of the shell 100 is 0.40-3.33, which makes the reinforcing member 130 have sufficient strength to support the pole group 300, thereby preventing the pole group 300 from being scratched. In this way, there is no need to set up an additional side plate, which reduces the manufacturing cost of the battery. At the same time, a gap is formed between the portion of the shell body 110 except for the portion where the reinforcing member 130 is set and the pole group 300, so that the gas generated by the pole group 300 can be discharged through this gap, reducing the risk of thermal runaway of the battery.

[0035] Optionally, the shell body 110 can be formed by bending a plate, and the two ends of the plate parallel to the fold and close to each other are connected together by high-frequency welding or laser welding to form a tubular structure, and the location of the weld forms the above-mentioned welding member 120. The shell body 110 is surrounded by two opposite openings, and the cover plate 200 described below is covered on the openings to enclose the electrode group 300 in the accommodation space surrounded by the shell body 110.

[0036] Furthermore, the shell body 110 is a structure of uniform thickness, and the thickness of the shell body 110 may be 0.30 mm-0.50 mm. Preferably, the thickness of the shell body 110 is 0.35 mm.

[0037] In the embodiments of the present application, Figure 3As shown, the welding member 120 includes a main body 123, a first welding part 121 and a second welding part 122, and the main body 123, the first welding part 121 and the second welding part 122 are all in the shape of a cuboid. The two ends of the shell body 110 are respectively connected to the two ends of the main body 123, the first welding part 121 protrudes from the main body 123 toward the inside of the accommodation space, and the second welding part 122 protrudes from the main body 123 toward the outside of the accommodation space. The size of the first welding part 121 protruding relative to the shell body 110 is smaller than the size of the reinforcing member 130 protruding relative to the shell body 110. The first welding part 121 and the second welding part 122 protrude toward the inside and outside of the accommodation space, respectively, which makes the thickness of the entire welding member 120 greater than the thickness of the shell body 110, increases the structural strength of the welding member 120, thereby reducing the risk of the battery shell 100 being broken at the welding member 120, and improving the service life of the battery. At the same time, the protruding dimension of the first welding portion 121 relative to the shell body 110 is smaller than the protruding dimension of the reinforcing member 130 relative to the shell body 110 , which can prevent the first welding portion 121 from scratching the electrode group 300 and improve the service life of the battery.

[0038] Optionally, the protrusion dimension of the first welding portion 121 relative to the shell body 110 is 0-0.15 mm, and the protrusion dimension of the second welding portion 122 relative to the shell body 110 is 0-0.5 mm. In other words, the size of the first welding portion 121 in the first direction L1 is 0-0.15mm, for example, the size of the first welding portion 121 in the first direction L1 is 0.03mm, 0.05mm, 0.06mm, 0.09mm, 0.1mm, 0.13mm or 0.15mm, etc. The first welding portion 121 with the above size can avoid interference between the first welding portion 121 and the electrode group 300, thereby avoiding damage to the electrode group 300, thereby improving the service life of the battery; the size of the second welding portion 122 in the first direction L1 is 0-0.5mm, for example, the size of the second welding portion 122 in the first direction L1 is 0.05mm, 0.1mm, 0.13mm, 0.19mm, 0.2mm, 0.3mm, 0.4mm, 0.45mm or 0.5mm, and the second welding portion 122 with the above size can improve the structural strength of the welding component 120, and at the same time can avoid interference between the second welding portion 122 and other external structures.

[0039] In the embodiment of the present application, the number of the reinforcing members 130 is two, and the two reinforcing members 130 are respectively located on both sides of the welding member 120 in the second direction L2. The two reinforcing members 130 can support the pole group 300, and enable the first exhaust channel 140, the second exhaust channel 150, the third exhaust channel 160 and the fourth exhaust channel 170 to be formed between the battery housing 100 and the pole group 300, so that the gas generated by the pole group 300 inside the battery housing 100 can be smoothly discharged through the first exhaust channel 140, the second exhaust channel 150, the third exhaust channel 160 and the fourth exhaust channel 170, thereby reducing the risk of thermal runaway of the battery and improving the operating safety of the battery.

[0040] Optionally, the dimension h of the reinforcing member 130 in the first direction L1 is 0.2 mm-1 mm, for example, the dimension h of the reinforcing member 130 in the first direction L1 is 0.2 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.44 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm, so that the structural strength of the reinforcing member 130 can be ensured, and then the supporting force of the reinforcing member 130 on the pole group can be ensured, thereby avoiding the interference between the welding member 120 and the pole group 300, and improving the service life of the battery. At the same time, the reinforcing member 130 is in the above-mentioned size, which can ensure the size of the first exhaust channel 140, the second exhaust channel 150, the third exhaust channel 160 and the fourth exhaust channel 170 formed between the pole group 300 and the shell body 110 in the first direction L1, and ensure that the gas generated by the pole group 300 can be discharged smoothly, reducing the risk of thermal runaway of the battery and improving the operating safety of the battery.

[0041] In the embodiment of the present application, the ratio of the size of the shell body 110 in the second direction L2 to the size of the reinforcing member 130 in the second direction L2 is 4.00-8.00. In this way, the welding member 120 has a sufficient length in the second direction L2, ensuring the support force of the reinforcing member 130 on the electrode group 300, thereby avoiding interference between the welding member 120 and the electrode group 300, and improving the service life of the battery.

[0042] Alternatively, if Figure 3 As shown, the dimension I of the reinforcing member 130 in the second direction L2 is 3 mm-8 mm. For example, the dimension I of the reinforcing member 130 in the second direction L2 can be 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.3 mm, 6 mm, 6.7 mm, 7 mm or 8 mm. The reinforcing member 130 whose dimension in the second direction L2 is within the above range has sufficient strength to ensure the support force for the electrode group 300, thereby avoiding interference between the welding member 120 and the electrode group 300, and improving the service life of the battery.

[0043] In addition, the strength of the battery housing 100 can be improved by providing a reinforcing member 130. In order to clarify the effect of the reinforcing member 130 on improving the strength of the battery housing 100, the bursting pressure of the battery housing 100 can be tested. Specifically, 5 test groups can be selected, each test group includes a battery housing 100 provided with a reinforcing member 130 in the present application and a battery housing without a reinforcing member, and the 10 battery housings in the 5 test groups have the same size and thickness. During the test, the battery housings in the 5 test groups are clamped and sealed around the opening of the battery housing using a pressure tester, and then inflated to a certain pressure until the housing bursts. The bursting pressures of the 5 test groups are as follows:

[0044]

[0045] After the reinforcing member 130 is added, the burst value of the housing is further improved, and the strength of the battery housing 100 is increased.

[0046] In addition, as the dimension h of the reinforcing member 130 in the first direction L1 and the dimension I in the second direction L2 increase, the strength of the battery housing 100 increases. In order to clarify the effect of the increase in the dimension h of the reinforcing member 130 in the first direction L1 and the dimension I in the second direction L2 on the strength of the battery housing 100, the bursting pressure of the battery housing 100 can be tested. Specifically, 10 test groups can be selected, each test group includes a battery housing 100 provided with a reinforcing member 130 in the present application, and the 10 battery housings in the 10 test groups have the same size and thickness, and the dimension h of the reinforcing member 130 in the first direction L1 and the dimension I in the second direction L2 are different. The bursting pressures of the 10 test groups are as follows:

[0047]

[0048] As the dimension h of the reinforcing member 130 in the first direction L1 and the dimension I in the second direction L2 increase, the battery housing 100 gradually increases. When the dimension h of the reinforcing member 130 in the first direction L1 is 0.6 mm and the dimension I in the second direction L2 is 6 mm, the bursting pressure of the battery housing 100 increases slowly. If the dimension h of the reinforcing member 130 in the first direction L1 and the dimension I in the second direction L2 continue to increase, the bursting pressure of the battery housing 100 remains almost unchanged. Therefore, the dimension h of the battery housing 100 in the first direction L1 is preferably 0.6 mm, and the dimension I of the reinforcing member 130 in the second direction L2 is preferably 6 mm.

[0049] In the embodiment of the present application, the size of the shell body 110 in the first direction L1 is 80mm-150mm, for example, the size of the shell body 110 in the first direction L1 can be 50mm, 85mm, 90mm, 92mm, 100mm, 105mm, 110mm, 120mm, 130mm, 140mm or 150mm; the size of the shell body 110 in the second direction L2 is 12mm-24mm, for example, the size of the shell body 110 in the second direction L2 can be The size of the shell body 110 in the third direction L3 is 400mm-1000mm. For example, the size of the shell body 110 in the third direction L3 can be 400mm, 450mm, 500mm, 570mm, 600mm, 650mm, 700mm, 800mm, 900mm or 1000mm.

[0050] Preferably, the size of the shell body 110 in the first direction L1 is 120 mm, the size of the shell body 110 in the second direction L2 is 16 mm, and the size of the shell body 110 in the third direction L3 is 500 mm.

[0051] It should be noted that although Figure 3 , an embodiment in which the cross-section of the reinforcing member 130 is rectangular is shown (in this case, the reinforcing member 130 is in the shape of a cuboid), however, in the entity of the battery housing 100, the shape of the reinforcing member 130 is not limited thereto, and the reinforcing member 130 may be any strip structure that can support the electrode group 300, for example, the cross-section of the reinforcing member 130 may be in the shape of a triangle, a rhombus, a hexagon, or the like.

[0052] Optionally, the battery housing 100 of the present application may be a housing of a blade battery or a housing of other types of batteries.

[0053] In the battery housing of the present application, the reinforcing member 130 has sufficient strength to support the pole group 300, thereby preventing the pole group 300 from being scratched. In this way, there is no need to set up additional side plates, which reduces the manufacturing cost of the battery. At the same time, a gap is formed between the portion of the shell body 110 except for the portion where the reinforcing member 130 is set and the pole group 300, so that the gas generated by the pole group 300 can be discharged through this gap, reducing the risk of thermal runaway of the battery.

[0054] According to another aspect of the present application, a battery is provided, such as Figure 4 As shown, the battery includes the battery housing 100 mentioned above.

[0055] Furthermore, if Figure 4As shown, the battery also includes a pole group 300, and the pole group 300 can be installed in the accommodation space enclosed by the battery shell 100 through the opening formed by the battery shell 100. The two reinforcing members 130 of the battery shell 100 can support the pole group 300, so that there is a gap between the pole group 300 and the welding member 120, which can prevent the pole group 300 from being scratched. At the same time, there is no need to set a side plate in the battery, which reduces the manufacturing cost of the battery. At the same time, the first exhaust channel 140, the second exhaust channel 150, the third exhaust channel 160 and the fourth exhaust channel 170 are enclosed between the pole group 300 and the shell body 110, so that the gas generated by the pole group 300 can be discharged through the first exhaust channel 140, the second exhaust channel 150, the third exhaust channel 160 and the fourth exhaust channel 170, reducing the risk of thermal runaway of the battery.

[0056] In addition, if Figure 4 As shown, the battery further includes two cover plates 200 , which are respectively a positive electrode cover plate and a negative electrode cover plate. The two cover plates 200 are respectively covered on two side openings formed by the battery housing 100 .

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery housing, characterized in that: The battery case comprises a shell body, a welding member and a reinforcing member, wherein two ends of the shell body are connected by the welding member, the shell body encloses a receiving space, the reinforcing member and the welding member are located on the same side of the shell body in a first direction, and the reinforcing member protrudes from the inner side wall of the shell body toward the inside of the receiving space along the first direction; The ratio of the dimension of the reinforcing member in the first direction to the thickness of the shell is 0.40-3.33; The number of the reinforcing components is two, and the two reinforcing components are respectively located on both sides of the welding component in a second direction, and the second direction is perpendicular to the first direction; The welding component includes a main body, a first welding part and a second welding part. The two ends of the shell body are respectively connected to the two ends of the main body. The first welding part and the second welding part protrude from the main body toward the inside and outside of the accommodating space respectively. The protruding size of the first welding part relative to the shell body is smaller than the protruding size of the reinforcing component relative to the shell body.

2. The battery housing according to claim 1, characterized in that: The dimension of the reinforcing member in the first direction is 0.2 mm-1 mm.

3. The battery housing according to claim 1, characterized in that: A ratio of a size of the shell body in the second direction to a sum of a size of the reinforcing member in the second direction is 4.00-8.

00.

4. The battery case according to claim 3, characterized in that: The sum of the dimensions of the reinforcing member in the second direction is 3 mm to 8 mm.

5. The battery housing according to claim 1, characterized in that: The protruding dimension of the first welding portion relative to the shell body is 0-0.15 mm, and / or the protruding dimension of the second welding portion relative to the shell body is 0-0.5 mm.

6. The battery case according to claim 1, characterized in that: A size of the first welding portion in the second direction is 0.5 mm-1 mm, and / or a size of the second welding portion in the second direction is 0.5 mm-1 mm.

7. The battery housing according to any one of claims 3 to 6, characterized in that: The size of the shell body in the first direction is 80mm-150mm, and / or the size of the shell body in the second direction is 12mm-20mm, and / or the size of the shell body in a third direction is 400mm-1000mm, and the third direction is perpendicular to the first direction and the second direction respectively.

8. A battery, characterized in that: The battery comprises the battery casing according to any one of claims 1 to 7.

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