Battery shell structure and battery
By designing weak areas and protrusions in the battery casing structure, the problems of reduced energy density and strength redundancy caused by excessive weight of the battery aluminum casing were solved, thereby achieving improved battery energy density and reduced cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-03-31
AI Technical Summary
In existing technologies, the aluminum casing of batteries is relatively heavy, which leads to a decrease in battery energy density and redundancy in strength, resulting in waste of materials and costs.
Weak areas are designed into the battery casing structure and raised sections are formed. By reducing the thickness of the bottom casing, the amount of material used and the weight are reduced, while maintaining the support and protection of the battery cells.
It increases the energy density of the battery, reduces costs, and reduces the amount of materials and weight without affecting the fixation and protection effect.
Smart Images
Figure CN224067741U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power battery technology, specifically to a battery casing structure and a battery. Background Technology
[0002] During the battery module assembly process, a casing structure needs to be set up outside the battery cell to seal and protect it.
[0003] In existing technologies, battery cells are typically enclosed and protected by an aluminum casing, with a top cover, adapter plates, and terminals at the ends of the casing. Among the structural components of a battery module other than the battery cell, the aluminum casing accounts for approximately 60% of the total weight of all structural components.
[0004] As a result, the aluminum casing and other structural components in existing battery modules are relatively heavy during manufacturing, leading to a decrease in battery energy density. Furthermore, since battery modules are typically assembled with an external battery box, which connects and secures to the aluminum casing, the stress on different parts of the aluminum casing varies. Therefore, some areas of the existing aluminum casing structure may have redundant strength, resulting in material and cost waste.
[0005] Therefore, there is an urgent need to provide a battery casing that can solve the problems of the large weight and strength redundancy of the aluminum battery casing in the existing technology, which leads to the reduction of battery energy density and cost waste. Utility Model Content
[0006] The purpose of this application is to provide a battery casing structure and battery that can solve the problems of the large weight and strength redundancy of the aluminum casing of batteries in the prior art, which leads to the reduction of battery energy density and cost waste.
[0007] To achieve the above objectives, in a first aspect, this application provides a battery casing structure with an internal cavity for accommodating a battery cell. The battery casing structure includes a bottom casing and side casings. The side casings are connected to the edge of the bottom casing and, together with the bottom casing, form an accommodating cavity with an open end. A weak region is formed on the upper surface of the bottom casing, which divides the upper surface of the bottom casing into at least one protrusion, the thickness of which is greater than that of the weak region.
[0008] Based on the embodiments described above, during the assembly and use of the battery casing structure, the thickness of a portion of the upper part of the bottom casing is reduced by forming weak areas on the bottom casing. This reduces the material usage and weight of the bottom casing, increases the overall energy density of the battery while reducing costs, and mitigates the problem of material and cost waste caused by strength redundancy. Simultaneously, the protrusions formed by the weak areas retain the original thickness of the bottom casing, thus supporting the bottom of the battery cell when it is assembled into the receiving cavity. Furthermore, when multiple protrusions are formed, they cooperate with each other, making the support for the bottom of the battery cell more stable and reliable. This achieves a reduction in the weight and material usage of the battery casing structure without affecting the original fixing and protective effects of the bottom casing and the overall battery casing structure.
[0009] In some embodiments, at least two protrusions are formed on the bottom shell along a first direction, the first direction corresponding to the length direction of the bottom shell.
[0010] Based on the embodiments described above in this application, during the manufacturing process of battery cells and battery casings, the battery casing and the internal cavity structure typically need to be configured to match the shape and structure of the battery cell. By providing at least two protrusions along the length of the bottom casing, i.e., providing multiple protrusions along the length of the battery cell, the battery cell can be better supported along the length direction, resulting in more stable support.
[0011] In some embodiments, the width of the protrusion gradually decreases from the center of the bottom housing to both sides along a first direction.
[0012] Based on the embodiments described above, during battery use, the battery cell may undergo slight expansion due to internal chemical reactions and heat generation. The expansion and deformation are greater in the center of the cell, decreasing towards the sides. Therefore, by designing the protrusions to gradually decrease in width from the center to both sides, the wider protrusions in the center can better handle the larger expansion and deformation in the center of the cell. The narrower protrusions on both sides correspond to the side areas where the cell deformation is smaller. This ensures effective support for the battery cell while reducing the overall volume and material usage of the protrusions, further reducing strength redundancy and lowering costs.
[0013] In some embodiments, the protrusion has a dimension of L1 along the second direction, and the bottom shell has a dimension of L2 along the second direction, where L1 ≥ 1 / 2L2, and the second direction corresponds to the width direction of the bottom shell.
[0014] Based on the embodiments described above, the dimensions of the protrusion along the width direction of the bottom housing are limited by the above-described settings to prevent the protrusion from being too small. When the protrusion is too small, it will result in poor support for the battery cell and also lead to insufficient overall strength of the bottom housing. Therefore, the above-described settings mitigate these problems to a certain extent.
[0015] In some embodiments, the thickness of the protrusion is H1, the thickness of the weak area is H2, and 1 < H1 / H2 ≤ 2.
[0016] Based on the embodiments described above, the thickness ratio between the protrusion and the weak area is limited. This avoids excessive thickness differences between the protrusion and the weak area, thereby reducing the impact on the overall strength of the bottom shell caused by excessive thickness differences. Thus, the strength of the bottom shell is maintained while reducing its weight and material usage.
[0017] In some embodiments, the total area of the protrusions is S1, the total area of the bottom shell is S2, and 0.1≤S1 / S2≤0.85.
[0018] Based on the embodiments described above, the area ratio of the protrusion to the bottom shell is limited. When the area ratio of the protrusion to the bottom shell is too small, most areas of the bottom shell become weak points, leading to low overall strength of the bottom shell and affecting its support and protection of the battery cells. Conversely, when the area ratio of the protrusion to the bottom shell is too large, the weak points become too small, failing to effectively reduce the weight and material usage of the bottom shell. Therefore, limiting the area ratio of the protrusion to the bottom shell helps to avoid these problems to some extent.
[0019] In some embodiments, an arc-shaped transition region is formed between the bottom shell and the side shell, and the radius of the transition region is R. The distance from the edge of the protrusion along the first direction to the side shell is L3, where L3 ≥ R + H1.
[0020] Based on the above embodiments of this application, during the battery casing manufacturing process, when the bottom casing and side casing are integrally formed through bending, an arc-shaped transition area will naturally form at the connection position between the bottom casing and the side casing. At this time, by limiting the distance between the protrusion and the side casing along the length of the bottom casing to be greater than the sum of the radius of the transition area and the thickness of the protrusion, interference between the protrusion and the transition area can be avoided, and interference between the battery cell and the transition area can also be avoided to a certain extent.
[0021] In some embodiments, an arc-shaped transition region is formed between the bottom shell and the side shell, and the radius of the transition region is R. The distance from the edge of the protrusion along the second direction to the side shell is L4, where L4 ≥ R + H1.
[0022] Based on the above embodiments of this application, similarly, by limiting the distance between the protrusion and the side shell in the width direction of the bottom shell to be greater than the sum of the radius of the transition area and the thickness of the protrusion, interference between the protrusion and the transition area can be avoided on the one hand, and interference between the battery cell and the transition area can also be avoided to a certain extent on the other hand.
[0023] In some embodiments, at least one protrusion is symmetrically arranged along a first direction, and at least one protrusion is symmetrically arranged along a second direction, the second direction corresponding to the width direction of the bottom shell.
[0024] Based on the embodiments described above, by symmetrically arranging the protrusions along the length of the bottom shell, the support of the protrusions for the battery cell in the length direction of the bottom shell is made more uniform, thus preventing the battery cell from shifting to one side to a certain extent. Simultaneously, it also makes the overall strength of the bottom shell more uniform in the length direction. Similarly, by symmetrically arranging the protrusions along the width direction of the bottom shell, not only is the support of the protrusions for the battery cell more stable in the width direction of the bottom shell, but it also makes the overall strength of the bottom shell more uniform in the width direction.
[0025] According to a second aspect of this application, a battery is provided, the battery including a cell and the battery housing structure described above, the cell being disposed within a receiving cavity.
[0026] Based on the embodiments described above, the battery provided in this application includes the aforementioned battery casing structure. Through this configuration, during battery manufacturing, the weight and material usage of the bottom casing are reduced by forming a weak area on the bottom casing, thereby reducing the overall weight and material usage of the battery casing, thus increasing the overall energy density of the battery while reducing costs.
[0027] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description
[0028] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the following detailed description to explain the present application, but do not constitute a limitation thereof. In the drawings:
[0029] Figure 1 This is a plan view of the battery casing structure provided in the embodiments of this application.
[0030] Figure 2This is another planar schematic diagram of the battery casing structure provided in the embodiments of this application.
[0031] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.
[0032] Figure 4 yes Figure 2 Enlarged schematic diagram of part B.
[0033] Figure 5 This is an exploded schematic diagram of the battery provided in the embodiments of this application.
[0034] Explanation of reference numerals in the attached figures
[0035] 1. Bottom shell; 11. Weak area; 12. Protrusion; 2. Side shell; 3. Receiving cavity; 4. Transition area; 5. Battery cell; 6. Terminal post; 7. Top cover; 8. Adapter plate. Detailed Implementation
[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0038] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0040] In this application, unless otherwise stated, directional terms such as "first direction," "second direction," and "third direction" are used based on Figure 1 , Figure 2 and Figure 5The XYZ coordinate system is defined in the text. Specifically, the X direction refers to the first direction, the Y direction refers to the second direction, and the Z direction refers to the third direction.
[0041] In the description of this application, it should be noted that, unless otherwise stated, the terms "inner," "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0042] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0043] In existing technologies, battery cells are typically enclosed and protected by an aluminum casing, with a top cover, adapter plates, and terminals at the ends of the casing. Among the structural components of a battery module other than the battery cell, the aluminum casing accounts for approximately 60% of the total weight of all structural components.
[0044] As a result, the aluminum casing and other structural components in existing battery modules are relatively heavy during manufacturing, leading to a decrease in battery energy density. Furthermore, since battery modules are typically assembled with an external battery box, which connects and secures to the aluminum casing, the stress on different parts of the aluminum casing varies. Therefore, some areas of the existing aluminum casing structure may have redundant strength, resulting in material and cost waste.
[0045] Furthermore, the battery casing needs to possess good strength, corrosion resistance, and thermal conductivity, thus requiring the selection of high-performance materials, such as 3003 aluminum-manganese alloy. The combination of these factors results in a higher overall cost for the aluminum casing structure, which in turn leads to a higher battery cost.
[0046] To address the aforementioned problems in the prior art, according to a first aspect of this application, an embodiment of this application provides a battery casing structure, wherein a receiving cavity 3 is formed inside the battery casing structure to accommodate a battery cell 5. (See reference...) Figures 1 to 3As shown, the battery casing structure includes a bottom casing 1 and a side casing 2. The side casing 2 is connected to the edge of the bottom casing 1 and, together with the bottom casing 1, forms a receiving cavity 3 with an opening at one end. A weak area 11 is formed on the upper surface of the bottom casing 1, which divides the upper surface of the bottom casing 1 into multiple protrusions 12, the thickness of which is greater than that of the weak area 11.
[0047] Based on the embodiments described above, during the assembly and use of the battery casing structure, the thickness of a portion of the upper area of the bottom casing 1 is reduced by forming a weak area 11 on the bottom casing 1. This reduces the material usage and weight of the bottom casing 1, increases the overall energy density of the battery while reducing costs, and mitigates the problem of material and cost waste caused by strength redundancy. Simultaneously, the protrusions 12 formed by the weak area 11 retain the original thickness of the bottom casing 1, thus supporting the bottom of the battery cell 5 when it is assembled into the receiving cavity 3. Furthermore, the multiple protrusions 12 cooperate with each other, making the support for the bottom of the battery cell 5 more stable and reliable. Therefore, without affecting the original fixing and protective effects of the bottom casing 1 and the overall battery casing structure, the weight and material usage of the battery casing structure are reduced.
[0048] Specifically, during battery assembly, after the battery cell 5 is assembled into the battery casing to form the battery structure, an external battery box or other structure is usually required for sealing and protection. At this time, the bottom wall of the battery casing is in direct contact with the bottom plate of the battery box or other structures. Therefore, the battery casing is not easily impacted and the possibility of deformation is small, which results in a strength redundancy at the bottom casing 1 position in the battery casing.
[0049] By creating the aforementioned configuration in this application, the strength redundancy of the bottom shell 1 is eliminated by forming a weak area 11 on the bottom shell 1, thereby reducing the strength and material usage of the bottom shell 1, increasing the battery energy density while reducing costs.
[0050] Furthermore, it should be noted that this application reduces the material usage and cost of the bottom shell 1 by forming a weak area 11 on the bottom shell 1, while the structure of the side shell 2 is not specifically limited. However, it should be understood that in other embodiments of this application, the material usage and cost of the side shell 2 can also be reduced by forming weak parts on the side shell 2, thereby further improving the battery energy density and reducing strength redundancy. In the specific production and processing process, the design can be flexibly adjusted according to the specific assembly method of the battery and the resulting different stress conditions at different positions of the side shell 2, and this application does not impose specific limitations on this.
[0051] refer to Figure 1As shown in some embodiments of this application, at least two protrusions 12 may be formed on the bottom shell 1 along a first direction, the first direction corresponding to the length direction of the bottom shell 1.
[0052] Based on the embodiments described above in this application, during the manufacturing process of the battery cell 5 and the battery casing, the battery casing and the internal cavity 3 structure are typically designed to match the shape and structure of the battery cell 5. By providing at least two protrusions 12 along the length of the bottom casing 1, that is, by providing multiple protrusions 12 along the length of the battery cell 5, the battery cell 5 can be better supported along the length direction, resulting in more stable support.
[0053] Specifically, by sequentially providing two or more protrusions 12 along the length of the battery cell 5, such as three, four, five, six or more, the battery cell 5 is supported sequentially along its length, thereby improving the stability of the support and strengthening the bottom shell 1.
[0054] In this application, the width and other dimensions of the protrusion 12 can be set in any suitable way.
[0055] In some embodiments of this application, multiple protrusions 12 may be configured to have the same size, that is, the length and width of the protrusions 12 are both set to be the same.
[0056] Based on the above embodiments of this application, multiple protrusions 12 are provided in the same way, which not only facilitates production and processing, but also makes the support of the protrusions 12 for the battery cell 5 more balanced and stable.
[0057] In some embodiments of this application, the plurality of protrusions 12 may be configured to be inclined relative to the length or width direction of the bottom housing 1.
[0058] Specifically, the multiple protrusions 12 can be inclined in the same direction. For example, the multiple protrusions 12 are all angled with the width direction of the bottom shell 1.
[0059] Alternatively, the multiple protrusions 12 can be inclined in different directions. For example, the multiple protrusions 12 are symmetrical along the length of the bottom shell 1. In this case, the multiple protrusions 12 on one side are set at a certain angle with the width direction of the bottom shell 1, such as 30°, while the multiple protrusions 12 on the other side are set at the opposite angle with the width direction of the bottom shell 1, i.e., -30°.
[0060] Based on the embodiments described above, the angle of the protrusion 12 can be arbitrarily and appropriately set according to different structures and methods of the battery cell 5, so that the protrusion 12 can better support the battery cell. The specific setting can be made according to actual conditions, and this application does not impose any specific limitations on it.
[0061] Or, refer to Figure 1 As shown, in some other embodiments of this application, the width of the protrusion 12 can gradually decrease from the middle of the bottom housing 1 to both sides along the first direction.
[0062] Based on the embodiments described above, during battery use, the battery cell 5 may undergo slight expansion due to internal chemical reactions and heat generation. The expansion deformation is greater in the middle of the battery cell 5, and smaller towards the sides. Therefore, by setting the width of the protrusion to gradually decrease from the middle to both sides, compared to a protrusion 12 with the same size, the wider protrusion 12 in the middle can better handle the larger expansion deformation in the middle of the battery cell 5. The narrower protrusion 12 on both sides corresponds to the side areas of the battery cell 5 with smaller deformation. This ensures effective support for the battery cell 5 while reducing the overall volume and material usage of the protrusion 12, further reducing strength redundancy and lowering costs.
[0063] Specifically, during battery use, expansion and deformation occur due to heat generation and other reasons. In the middle of cell 5, heat is more difficult to dissipate, and the expansion within cell 5 extends outwards, resulting in greater expansion and deformation in the middle compared to the sides. Consequently, after cell 5 is assembled into the receiving cavity 3, the pressure on the middle of the bottom casing 1 during expansion and deformation is greater than on the sides. However, through the aforementioned design, the protrusion 12 near the middle of cell 5 has a larger area, providing greater strength and thus offering greater support during expansion and deformation.
[0064] Furthermore, the phrase "the width of the protrusion 12 can gradually decrease" in this application can refer to either the width of the protrusion 12 decreasing sequentially to both sides, meaning that there is a difference in width between any two adjacent protrusions 12, or it can refer to the width of the protrusion 12 decreasing in stages to both sides, for example, the width of every two protrusions 12 being the same. The specific setting can be flexibly configured according to the actual situation, and this application does not impose any specific restrictions on it.
[0065] refer to Figure 1 As shown, in some embodiments of this application, at least one protrusion 12 may be symmetrically arranged along a first direction, and at least one protrusion 12 may be symmetrically arranged along a second direction, the second direction corresponding to the width direction of the bottom shell 1.
[0066] Based on the embodiments described above, by symmetrically arranging the protrusions 12 along the length direction of the bottom housing 1, the support of the protrusions 12 for the battery cell 5 along the length direction of the bottom housing 1 is made more uniform, thus preventing the battery cell 5 from shifting to one side to a certain extent. Simultaneously, it also makes the overall strength of the bottom housing 1 more uniform in the length direction. Similarly, by symmetrically arranging the protrusions 12 along the width direction of the bottom housing 1, not only is the support of the protrusions 12 for the battery cell 5 more stable in the width direction of the bottom housing 1, but it also makes the overall strength of the bottom housing 1 more uniform in the width direction.
[0067] Specifically, based on the above description of this application, a plurality of protrusions 12 are formed on the bottom shell 1 along the first direction. Therefore, when an even number of protrusions 12 are formed, the aforementioned "protrusions 12 are symmetrically arranged along the first direction" can refer to the plurality of protrusions 12 on both sides being symmetrically arranged with the center line of the bottom shell 1 in the first direction as the center. When an odd number of protrusions 12 are provided, the aforementioned "protrusions 12 are symmetrically arranged along the first direction" can mean that the middle protrusion 12 is symmetrical with the center line of the bottom shell 1 in the first direction as the center, while the other protrusions 12 on both sides are symmetrically arranged.
[0068] Furthermore, along the second direction, only one set of protrusions 12 can be provided, i.e., all protrusions 12 are arranged in a row along the first direction, or two or more sets of protrusions 12 can be provided. When only one set of protrusions 12 is provided along the second direction, the above-mentioned "protrusions 12 are symmetrically arranged along the second direction" can mean that the protrusions 12 themselves are symmetrical about the centerline of the bottom shell 1 in the second direction. Similarly, when an even number of protrusions 12 are provided in the second direction, it can mean that the multiple sets of protrusions 12 on both sides are symmetrically arranged with respect to each other. When three or more odd number of protrusions 12 are provided in the second direction, the middle set of protrusions 12 is symmetrically arranged with respect to itself, while the multiple sets of protrusions 12 on both sides are symmetrically arranged with respect to each other.
[0069] It should be noted that during assembly, the battery cell 5 is typically assembled into the receiving cavity 3 along a third direction, which corresponds to the height direction of the battery cell 5, i.e., the height direction of the receiving cavity 3. The aforementioned first direction corresponds to the length direction of the receiving cavity 3 as well as the length direction of the bottom housing 1, and the second direction corresponds to the width direction of the receiving cavity 3 as well as the width direction of the receiving cavity 3.
[0070] Meanwhile, the "length direction of the battery cell 5" in this application specifically refers to the length direction of the side of the battery cell 5 that is in contact with the bottom housing 1 after the battery cell 5 is assembled into the receiving cavity 3, that is, the first direction. Similarly, the "width direction of the battery cell 5" mentioned above also specifically refers to the width direction of the side of the battery cell 5 that is in contact with the bottom housing 1, that is, the second direction.
[0071] refer to Figure 1 As shown in some embodiments of this application, the size of the protrusion 12 along the second direction is L1, and the size of the bottom shell 1 along the second direction is L2, then L1≥1 / 2L2.
[0072] Based on the above embodiments of this application, the dimensions of the protrusion 12 along the width direction of the bottom housing 1 are limited by the above-described settings to prevent the protrusion 12 from being too small along the width direction of the bottom housing 1. When the size of the protrusion 12 is too small, on the one hand, the support effect of the protrusion 12 on the battery cell 5 will be poor, and on the other hand, the overall strength of the bottom housing 1 will be too low. Therefore, the above-described settings avoid the above problems to a certain extent.
[0073] refer to Figure 2 and Figure 3 As shown in some embodiments of this application, the thickness of the protrusion 12 is H1, and the thickness of the weak area 11 is H2, then 1 < H1 / H2 ≤ 2.
[0074] Based on the embodiments described above in this application, the thickness ratio between the protrusion 12 and the weak area 11 is limited. This avoids excessive thickness difference between the protrusion 12 and the weak area 11, thereby reducing the impact on the overall strength of the bottom shell 1 caused by excessive thickness difference. Thus, the strength of the bottom shell 1 is maintained while reducing its weight and material usage.
[0075] Furthermore, in this application, since the protrusions 12 are formed by creating a weak area 11 on the bottom housing 1, the thickness of the protrusions 12 mentioned above is the original thickness of the bottom housing 1. In this case, the thickness of each protrusion 12 is usually consistent, which also facilitates the stable assembly of the battery cell 5 later.
[0076] Specifically, in the actual production and processing process, the specific ratio between the thickness of the protrusion 12 and the thickness of the weak area can be set to multiple specific values such as 1.1, 1.3, 1.5, 1.8 and 2, and this application does not impose specific restrictions on this.
[0077] refer to Figure 1 As shown in some embodiments of this application, the total area of the protrusion 12 is S1, and the total area of the bottom shell 1 is S2, then 0.1≤S1 / S2≤0.85.
[0078] Based on the embodiments described above, the area ratio of the protrusion 12 to the bottom housing 1 is limited. When the area ratio of the protrusion 12 to the bottom housing 1 is too small, most of the area on the bottom housing 1 becomes a weak area 11. This results in low overall strength of the bottom housing 1 and also affects its support and protection of the battery cell 5. Conversely, when the area ratio of the protrusion 12 to the bottom housing 1 is too large, the area of the weak area 11 becomes too small, making it impossible to effectively reduce the weight and material usage of the bottom housing 1. Therefore, limiting the area ratio of the protrusion 12 to the bottom housing 1 helps to avoid these problems to some extent.
[0079] In the specific production and processing process, the ratio between the total area of the protrusion and the area of the bottom shell can be set to multiple specific values such as 0.1, 0.3, 0.5, 0.7 and 0.85, and this application does not impose specific restrictions on this.
[0080] Specifically, during battery assembly, the battery cell 5 is assembled into the receiving cavity 3, at which point the bottom of the battery cell 5 contacts the surface of the protrusion 12. When the battery cell 5 is placed upright, its weight directly acts on the protrusion 12. Therefore, if the area of the protrusion 12 is too small, the pressure per unit area at the contact point between the battery cell 5 and the protrusion 12 will increase. This may damage the bottom of the battery cell 5 and increase the strength requirements for the protrusion 12. Therefore, by limiting the area of the protrusion 12 as described above, we avoid making the protrusion 12 too small, thus preventing the area of the protrusion 12 from being too small relative to the area of the bottom shell 1, given a fixed area of the bottom shell 1, thereby avoiding the aforementioned problems.
[0081] refer to Figures 1 to 4 As shown, in some embodiments of this application, an arc-shaped transition region 4 is formed between the bottom shell 1 and the side shell 2, and the radius of the transition region 4 is R. The distance from the edge of the protrusion 12 along the first direction to the side shell 2 is L3, where L3 ≥ R + H1.
[0082] Based on the above embodiments of this application, during the battery casing manufacturing process, when the bottom casing 1 and the side casing 2 are integrally formed through bending, an arc-shaped transition region 4 will naturally form at the connection position between the bottom casing 1 and the side casing. At this time, by limiting the distance between the protrusion 12 and the side casing 2 in the length direction of the bottom casing 1 to be greater than the sum of the radius of the transition region 4 and the thickness of the protrusion 12, interference between the protrusion 12 and the transition region 4 can be avoided, and interference between the battery cell 5 and the transition region 4 can also be avoided to a certain extent.
[0083] Further reference Figure 1 and Figure 4As shown, in some embodiments of this application, an arc-shaped transition region 4 is formed between the bottom shell 1 and the side shell 2, and the radius of the transition region 4 is R. The distance from the edge of the protrusion 12 along the second direction to the side shell 2 is L4, where L4 ≥ R + H1.
[0084] Based on the above embodiments of this application, similarly, by limiting the distance between the protrusion 12 and the side shell 2 in the width direction of the bottom shell 1 to be greater than the sum of the radius of the transition region 4 and the thickness of the protrusion 12, interference between the protrusion 12 and the transition region 4 can be avoided on the one hand, and interference between the battery cell 5 and the transition region 4 can also be avoided to a certain extent on the other hand.
[0085] Furthermore, it should be noted that this application does not impose specific limitations on the shape of the protrusion 12. In actual production and processing, the protrusion 12 can be set to various shapes, including circles, rectangles, and triangles. The specific shape can be set according to factors such as processing technology. This application does not impose specific limitations on this.
[0086] Furthermore, since the protrusion 12 can be configured with any suitable shape, the statement "the distance L3 from the edge of the protrusion 12 along the first direction to the side housing 2" in this application refers to the closest distance from the edge of the protrusion 12 in the first direction to the side housing 2. Similarly, the statement "the distance L4 from the edge of the protrusion 12 along the second direction to the side housing 2" refers to the closest distance from the edge of the protrusion 12 in the second direction to the side housing 2.
[0087] Based on the above technical solution, according to the second aspect of this application, a battery is provided, with reference to... Figure 5 As shown, the battery includes a cell 5 and the aforementioned battery casing structure, with the cell 5 disposed within the receiving cavity 3.
[0088] Based on the embodiments described above, the battery provided in this application includes the aforementioned battery casing structure. Through this configuration, during battery manufacturing, the weight and material usage of the bottom casing 1 are reduced by forming a weak area 11 on the bottom casing 1, thereby reducing the overall weight and material usage of the battery casing, thus increasing the overall energy density of the battery while reducing costs.
[0089] Furthermore, it should be noted that the specific structure of the battery in this application is not limited to the components mentioned above. (Reference) Figure 5 As shown in some embodiments of this application, various components, including terminals 6, top covers 7, and adapter plates 8, may be set during the battery assembly process. The specific components can be set according to the actual situation, and this application does not impose any specific restrictions on them.
[0090] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application.
[0091] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.
[0092] Furthermore, various different implementations of this application can be combined in any way, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.
Claims
1. A battery casing structure having an internal cavity for accommodating battery cells, characterized in that, The battery housing structure comprises: a bottom housing; a side housing connected to the edge of the bottom housing and cooperating with the bottom housing to form the accommodating cavity with an open end; wherein a weak area is formed on the upper surface of the bottom housing, the weak area separates the upper surface of the bottom housing into at least one protruding part, and the thickness of the protruding part is greater than that of the weak area.
2. The battery case structure according to claim 1, wherein At least two protruding parts are formed on the bottom housing along a first direction, and the first direction corresponds to the length direction of the bottom housing.
3. The battery case structure according to claim 2, wherein The width of the protruding part gradually decreases from the middle to both sides of the bottom housing along the first direction.
4. The battery case structure according to any one of claims 1 to 3, characterized by, The size of the protruding part along a second direction is L1, and the size of the bottom housing along the second direction is L2, L1≥1 / 2L2. The second direction corresponds to the width direction of the bottom housing.
5. The battery case structure according to any one of claims 1 to 3, characterized by, The thickness of the protruding part is H1, and the thickness of the weak area is H2, 1 6. The battery case structure according to any one of claims 1 to 3, characterized by, The total area of the protruding part is S1, and the total area of the bottom housing is S2, 0.1≤S1 / S2≤0.
85.
7. The battery case structure according to any one of claims 1 to 3, characterized by, An arc-shaped transition area is formed between the bottom housing and the side housing, and the radius of the transition area is R; The distance between the edge of the protruding part along the first direction and the side housing is L3, L3≥R+H1. The first direction corresponds to the length direction of the bottom housing.
8. The battery case structure according to any one of claims 1 to 3, characterized by, An arc-shaped transition area is formed between the bottom housing and the side housing, and the radius of the transition area is R; The distance between the edge of the protruding part along the second direction and the side housing is L4, L4≥R+H1. The second direction corresponds to the width direction of the bottom housing.
9. The battery case structure according to any one of claims 1 to 3, characterized by, At least one protruding part is symmetrically arranged along a first direction, and at least one protruding part is symmetrically arranged along a second direction, the first direction corresponds to the length direction of the bottom housing, and the second direction corresponds to the width direction of the bottom housing.
10. A battery, characterized by The battery comprises: a battery cell; and The battery housing structure according to any one of claims 1-9, wherein the battery cell is arranged in the accommodating cavity.