Battery case and battery

Abstract

The application belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprising a connecting end plate, a shell body and a closing end plate, the shell body being a hollow shell structure comprising two expansion parts and two connecting parts in a cross distribution, the connecting end plate being connected to one side of the two expansion parts, the other side of the expansion part being provided with a first mounting opening, the side of the connecting part close to the connecting end plate being provided with a connecting opening connected with a battery cover plate, the other side of the connecting part away from the connecting end plate being provided with a second mounting opening communicated with the first mounting opening, the first mounting opening and the second mounting opening together constituting a cross-shaped opening structure, the closing end plate comprising two first plate bodies and two second plate bodies, and being connected to the first mounting opening and the second mounting opening respectively. Not only can the volume be increased, but also excellent space adaptation utilization rate can be achieved, effective limiting, stable connection and good protection can be provided.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery casing and a battery. Background Technology

[0002] With the rapid development of electronic devices and energy storage technologies, batteries, as the core energy storage unit, are mainly composed of battery electrode packs, electrolyte, casing, and cover plate. Battery electrode packs, as the core carriers of electrochemical reactions, are formed by winding or stacking positive and negative electrode sheets and separators, which determine the basic capacity and electrochemical performance of the battery. The electrolyte provides a medium for ion conduction and ensures the charging and discharging process. The casing and cover plate together form an external encapsulation structure, which undertakes the functions of accommodating internal components, isolating the external environment, and providing mechanical protection.

[0003] First, the casing provides physical space for the internal battery electrode assembly, electrolyte, and other core components, ensuring the stable assembly and positioning of each component. Second, the casing provides mechanical protection, resisting external impacts, compression, and vibrations to prevent mechanical damage to the internal battery electrode assembly. It also works with the cover plate to achieve a sealed encapsulation, preventing external moisture and dust from entering and ensuring the stability of the internal electrochemical environment of the battery.

[0004] However, existing battery casings generally adopt regular cylindrical or cuboid structures, and capacity can only be increased by proportionally enlarging the overall size of the battery electrode assembly. This not only makes it difficult to adapt to various irregular installation spaces, resulting in a large waste of space and limiting the application flexibility and space utilization of the battery in complex environments, but also, since both the battery electrode assembly and the battery casing are regular shapes, there is no limiting structure between them. When the battery is subjected to external forces such as vibration, impact or drop, the battery electrode assembly is prone to shifting and displacement, resulting in damage to the electrode tabs and poor connection stability and protection. Summary of the Invention

[0005] The purpose of this invention is to provide a battery casing and battery that not only increases volume while having excellent space adaptability and utilization, but also provides effective positioning, connection stability and good protection.

[0006] To achieve this objective, the present invention adopts the following technical solution: On one hand, a battery housing is provided, the battery housing comprising: Connecting end plate; The outer shell body is a hollow shell structure comprising two expansion sections and two connecting sections arranged in a cross shape. The two expansion sections are spaced apart along a first direction, and the two connecting sections are spaced apart along a second direction. A connecting end plate is connected to one side of the two expansion sections along a third direction. The expansion sections are provided with a first mounting opening on the other side along the third direction. The connecting sections are provided with a connecting opening connected to the battery cover on the side of the third direction near the connecting end plate. The connecting sections are provided with a second mounting opening communicating with the first mounting opening on the other side along the third direction away from the connecting end plate. The first mounting opening and the second mounting opening together form a cross-shaped opening structure. A closed end plate, comprising two first plates and two second plates arranged in a cross shape, wherein the first plates are connected to the first mounting opening and the second plates are connected to the second mounting opening, the first direction is the width direction of the outer shell body, the second direction is the height direction of the outer shell body, and the third direction is the length direction of the outer shell body.

[0007] Optionally, the expansion section includes two support panels disposed opposite to each other along the second direction, an intermediate side plate disposed between the two support panels and perpendicular to the connecting end plate, and a connecting side plate connecting the intermediate side plate and the connecting end plate, wherein the connecting side plate is obliquely disposed between the intermediate side plate and the connecting end plate.

[0008] Optionally, the length of the middle side plate along the third direction is K, and the length of the outer shell body along the third direction is E, satisfying 0.6≤K / E≤0.8.

[0009] Optionally, the height dimension of the middle side plate along the second direction is W, and satisfies 25mm≤W≤120mm.

[0010] Optionally, the width dimension of the connecting end plate along the first direction is L1, and the spacing dimension of the middle side plates of the two expansion parts along the first direction is A1, and satisfies 0.3≤L1 / A1≤0.65.

[0011] Optionally, the connecting part includes two side end plates arranged opposite each other along the first direction and connected to the bearing panel, and a connecting top plate vertically connected between the two side end plates. The width dimension of the connecting top plate along the first direction is L2, and satisfies 8mm≤L1-L2≤30mm.

[0012] Optionally, the distance between the connecting top plates of the two connecting parts along the second direction is A2, and satisfies 40mm≤A2-A1≤150mm.

[0013] Optionally, the distance between the connecting top plate and the connecting end plate of the connecting part along the second direction is F, and satisfies 0.5≤2F / A2≤0.75.

[0014] Optionally, the first plate, the second plate, and the connecting side plate are all provided with mounting through holes for installing explosion-proof valves.

[0015] On the other hand, a battery is provided, the battery including a battery cover, a battery electrode assembly and a battery housing as described in any of the above, wherein the battery cover is connected to each connection opening to close the battery housing, and the battery electrode assembly is placed inside the battery housing.

[0016] The beneficial effects of this invention are: This invention provides a battery casing that employs a split structure composed of a connecting end plate, a housing body, and a closing end plate. The housing body has two expansion sections and two connecting sections arranged in a cross shape, giving the battery casing an overall cross-shaped profile. This allows it to adapt to corresponding cross-shaped or irregularly shaped installation spaces, avoiding the space waste caused by the monotonous shape of traditional regular casings. This effectively improves the space utilization and application flexibility of the battery in complex layout environments. Furthermore, because the two expansion sections are spaced apart along a first direction and the two connecting sections are spaced apart along a second direction, the battery casing maintains the connection interface... Without changing the dimensions, additional internal volume can be obtained by using the expansion sections on both sides, thus increasing the battery capacity without proportionally enlarging the overall size of the battery electrode assembly. This increases the energy density without changing the external installation compatibility. In addition, due to the transitional step structure with a change in cross-sectional shape between the expansion section and the connection section, the corresponding part of the battery electrode assembly can be limited in multiple directions by the inner wall of the casing and the step surface after the battery electrode assembly is installed. When the battery is subjected to external forces such as vibration, impact or drop, the battery electrode assembly is not prone to shifting or displacement, thereby avoiding the pulling damage to the tabs caused by the displacement of the battery electrode assembly, and significantly improving the stability of the internal connection and structural protection of the battery.

[0017] The present invention also provides a battery that, by applying the above-mentioned battery casing, can effectively prevent misalignment after assembly, ensure the stability of the battery structure, improve the safety and reliability of use, and ensure that it can be adapted to installation in irregular spaces while having a large capacity, thus providing better installation flexibility. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the battery casing from the front end view provided by the present invention; Figure 2 This is a structural schematic diagram of the battery casing from the rear end perspective provided by the present invention; Figure 3This is a structural exploded view of the battery casing provided by the present invention; Figure 4 This is a front view plan view of the battery casing provided by the present invention; Figure 5 This is a plan view of the battery casing provided by the present invention, which has a closed end plate. Figure 6 This is a plan view of the battery casing provided by the present invention, showing the side with the connecting end plate.

[0019] In the picture: 100. Install through holes; 1. Connecting end plate; 2. Outer shell body; 21. Expansion section; 211. First mounting opening; 212. Support panel; 213. Middle side plate; 214. Connecting side plate; 22. Connecting part; 221. Connecting opening; 222. Second mounting opening; 223. Side end plate; 224. Connecting top plate; 3. Closed end plate; 31. First plate; 32. Second plate. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] With the rapid development of electronic devices and energy storage technologies, batteries, as the core energy storage unit, are mainly composed of battery electrode packs, electrolyte, casing, and cover plate. Battery electrode packs, as the core carriers of electrochemical reactions, are formed by winding or stacking positive and negative electrode sheets and separators, which determine the basic capacity and electrochemical performance of the battery. The electrolyte provides a medium for ion conduction and ensures the charging and discharging process. The casing and cover plate together form an external encapsulation structure, which undertakes the functions of accommodating internal components, isolating the external environment, and providing mechanical protection.

[0025] First, the casing provides physical space for the internal battery electrode assembly, electrolyte, and other core components, ensuring the stable assembly and positioning of each component. Second, the casing provides mechanical protection, resisting external impacts, compression, and vibrations to prevent mechanical damage to the internal battery electrode assembly. It also works with the cover plate to achieve a sealed encapsulation, preventing external moisture and dust from entering and ensuring the stability of the internal electrochemical environment of the battery.

[0026] However, existing battery casings generally adopt regular cylindrical or cuboid structures, and capacity can only be increased by proportionally enlarging the overall size of the battery electrode assembly. This not only makes it difficult to adapt to various irregular installation spaces, resulting in a large waste of space and limiting the application flexibility and space utilization of the battery in complex environments, but also, since both the battery electrode assembly and the battery casing are regular shapes, there is no limiting structure between them. When the battery is subjected to external forces such as vibration, impact or drop, the battery electrode assembly is prone to shifting and displacement, resulting in damage to the electrode tabs and poor connection stability and protection.

[0027] Therefore, in order to adapt to irregularly shaped installation spaces, increase internal volume, enhance the limiting of battery electrode groups, and ensure stability and protection after assembly, this embodiment provides a battery casing.

[0028] like Figures 1 to 6As shown, the battery casing includes a connecting end plate 1, a housing body 2, and a closed end plate 3. The housing body 2 is a hollow shell structure including two expansion sections 21 and two connecting sections 22 arranged in a cross shape. The two expansion sections 21 are spaced apart along a first direction, and the two connecting sections 22 are spaced apart along a second direction. The connecting end plate 1 is connected to one side of the two expansion sections 21 along a third direction. The other side of the expansion sections 21 along the third direction has a first mounting opening 211. The connecting section 22 has a connecting opening 221 for connecting to the battery cover plate on the side near the connecting end plate 1 along the third direction. A second mounting opening 222, which communicates with the first mounting opening 211, is provided on the other side away from the connecting end plate 1 along a third direction. The first mounting opening 211 and the second mounting opening 222 together form a cross-shaped opening structure. The closed end plate 3 includes two first plates 31 and two second plates 32 distributed in a cross shape. The first plates 31 are connected to the first mounting opening 211, and the second plates 32 are connected to the second mounting opening 222. The first direction is the width direction of the outer shell body 2, the second direction is the height direction of the outer shell body 2, and the third direction is the length direction of the outer shell body 2.

[0029] The battery casing adopts a split structure composed of a connecting end plate 1, a housing body 2, and a closed end plate 3. The housing body 2 has two expansion sections 21 and two connecting sections 22 arranged in a cross shape, giving the battery casing an overall cross-shaped profile. This allows it to adapt to corresponding cross-shaped or irregularly shaped installation spaces, avoiding the space waste caused by the monotonous shape of traditional regular casings. This effectively improves the space utilization and application flexibility of the battery in complex layout environments. Simultaneously, because the two expansion sections 21 are spaced apart along a first direction and the two connecting sections 22 are spaced apart along a second direction, the battery casing maintains the dimensions of the mounting interfaces of the connecting sections 22. Without changing the overall size of the battery electrode assembly, additional internal volume can be obtained by means of the expansion sections 21 on both sides, so the battery capacity can be increased without proportionally increasing the overall size of the battery electrode assembly. This increases the energy density without changing the external installation compatibility. In addition, since there is a transition step structure with a change in cross-sectional shape between the expansion section 21 and the connecting section 22, the corresponding part of the battery electrode assembly can be limited in multiple directions by the inner wall of the shell and the step surface after the battery electrode assembly is installed. When the battery is subjected to external forces such as vibration, impact or drop, the battery electrode assembly is not easy to move or shift, thereby avoiding the pulling damage to the electrode tabs caused by the displacement of the battery electrode assembly, and significantly improving the stability of the internal connection and the structural protection of the battery.

[0030] Optionally, such as Figure 3As shown, the expansion section 21 includes two support panels 212 arranged opposite to each other along the second direction, an intermediate side plate 213 disposed between the two support panels 212 and perpendicular to the connecting end plate 1, and a connecting side plate 214 connecting the intermediate side plate 213 and the connecting end plate 1. The connecting side plate 214 is inclinedly disposed between the intermediate side plate 213 and the connecting end plate 1.

[0031] By setting up an expansion section 21 consisting of a support panel 212, an intermediate side plate 213, and a connecting side plate 214, and by tilting the connecting side plate 214 between the intermediate side plate 213 and the connecting end plate 1, the connecting side plate 214 can be used to limit the battery electrode assembly, preventing the battery electrode assembly from moving around in the battery casing and ensuring the stability after assembly.

[0032] Optionally, mounting holes 100 for installing explosion-proof valves are provided on the first plate 31, the second plate 32, and the connecting side plate 214. By providing mounting holes 100 for installing explosion-proof valves on the first plate 31, the second plate 32, and the connecting side plate 214, pressure can be released quickly and promptly in all areas of the battery casing, preventing excessive internal pressure and explosion during thermal runaway, thus ensuring high safety and reliability.

[0033] Optionally, such as Figure 3 and Figure 4 As shown, the length of the middle side plate 213 along the third direction is K, and the length of the outer shell body 2 along the third direction is E, and satisfies 0.6≤K / E≤0.8.

[0034] By limiting the ratio of the length K of the intermediate side plate 213 along the third direction to the length E of the outer casing 2 along the third direction, such that it satisfies 0.6≤K / E≤0.8, it can prevent the intermediate side plate 213 from being too short due to an excessively small ratio, resulting in insufficient space for battery electrode expansion in the third direction of the expansion section 21, which would make it difficult to meet the power supply demand. On the other hand, it can also avoid the intermediate side plate 213 from being too long due to an excessively large ratio, which would cause the connecting side plate 214 and the connecting end plate 1 to become parallel, making the installation through hole 100 for installing the explosion-proof valve on the connecting side plate 214 too close to the battery cover plate connected to the connection opening 221, which would easily damage the battery cover plate in the event of thermal runaway.

[0035] The ratio of the length dimension K of the middle side plate 213 along the third direction to the length dimension E of the outer shell body 2 along the third direction can be any value between 0.6 and 0.8 or any range between two values, such as 0.6, 0.65, 0.7, 0.72, 0.75, 0.78, 0.8, etc.

[0036] Optionally, such as Figure 3 and Figure 5As shown, the height dimension of the middle side plate 213 along the second direction is W, and it satisfies 25mm≤W≤120mm.

[0037] By limiting the height dimension W of the middle side plate 213 along the second direction to satisfy 25mm≤W≤120mm, it can prevent insufficient space for battery electrode expansion section 21 along the second direction due to W being too small, making it difficult to meet the power supply demand. It can also avoid the volume of the connection section 22 being compressed due to W being too large, resulting in the connection opening 221 used for setting the battery cover being too small, and the area of ​​the battery cover not being able to meet the overcurrent demand.

[0038] The height dimension W of the middle side plate 213 along the second direction can be any value between 25mm and 120mm or any range between two values, such as 25mm, 40mm, 60mm, 80mm, 100mm, 110mm, 120mm, etc.

[0039] In this embodiment, in order to verify the effect of the above parameter limitations on the battery casing provided in this embodiment, as shown in Table 1, four sets of embodiments and four sets of comparative examples are provided for verification.

[0040] Table 1 A comparison of Examples 1 to 4 with Comparative Examples 1 to 2 reveals that when the ratio of the length dimension K of the intermediate side plate 213 along the third direction to the length dimension E of the outer shell body 2 along the third direction is less than the minimum value in the range 0.6≤K / E≤0.8, the intermediate side plate 213 is too short, resulting in insufficient space for the expansion section 21 along the third direction for expanding the battery electrode assembly, making it difficult to meet the energy supply requirements. When the ratio of the length dimension K of the intermediate side plate 213 along the third direction to the length dimension E of the outer shell body 2 along the third direction is greater than the maximum value in the range 0.6≤K / E≤0.8, the connecting side plate 214 and the connecting end plate 1 tend to be parallel, causing the mounting through hole 100 for installing the explosion-proof valve on the connecting side plate 214 to be too close to the battery cover plate connected to the connecting opening 221, which can easily damage the battery cover plate in the event of thermal runaway.

[0041] A comparison of Examples 1 to 4 with Comparative Examples 3 to 4 reveals that when the height W of the middle side plate 213 along the second direction is less than the minimum value of the range 25mm≤W≤120mm, the space for expanding the capacity of the battery electrode group in the expansion part 21 along the second direction is insufficient, making it difficult to meet the power supply requirements; when the height W of the middle side plate 213 along the second direction is greater than the maximum value of the range 25mm≤W≤120mm, the volume of the connecting part 22 is compressed, resulting in the connecting opening 221 used for setting the battery cover being too small, and the area of ​​the battery cover cannot meet the overcurrent requirements.

[0042] Optionally, such as Figure 3 and Figure 6 As shown, the width dimension of the connecting end plate 1 along the first direction is L1, and the spacing dimension of the middle side plates 213 of the two expansion parts 21 along the first direction is A1, and satisfies 0.3≤L1 / A1≤0.65.

[0043] By limiting the ratio of the width L1 of the connecting end plate 1 along the first direction to the spacing A1 of the middle side plates 213 of the two expansion sections 21 along the first direction, such that 0.3≤L1 / A1≤0.65, it can prevent the width of the connecting end plate 1 along the first direction from being too small due to an excessively small ratio, which would result in an excessively short spacing between the expansion sections 21 on both sides of the connecting end plate 1. This would cause the mounting through hole 100 for installing the explosion-proof valve on the connecting side plate 214 to be too close to the battery cover plate connected to the connecting opening 221, which would easily damage the battery cover plate in the event of thermal runaway. On the other hand, it can also prevent the connecting end plate 1 from being too long and narrow due to an excessively large ratio, which would result in poor structural strength and easy breakage.

[0044] The ratio of the width L1 of the connecting end plate 1 along the first direction to the spacing A1 of the middle side plates 213 of the two expansion sections 21 along the first direction can be any value between 0.3 and 0.65 or any range between two values, such as 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, etc.

[0045] Optionally, such as Figure 3 and Figure 6 As shown, the connecting part 22 includes two side end plates 223 that are arranged opposite to each other along the first direction and connected to the bearing panel 212, and a connecting top plate 224 that is vertically connected between the two side end plates 223. The width dimension of the connecting top plate 224 along the first direction is L2, and satisfies 8mm≤L1-L2≤30mm.

[0046] By limiting the difference between the width dimension L1 of the connecting end plate 1 along the first direction and the width dimension L2 of the connecting top plate 224 along the first direction, such that it satisfies 8mm≤L1-L2≤30mm, it can prevent the connecting opening 221 from being too large due to the difference being too small, resulting in dimensional redundancy in the corresponding battery cover and high manufacturing cost. It can also avoid the space in the connecting part 22 for battery electrode expansion being insufficient due to the difference being too large, making it difficult to meet the power supply demand.

[0047] The difference between the width dimension L1 of the connecting end plate 1 along the first direction and the width dimension L2 of the connecting top plate 224 along the first direction can be any value between 8mm and 30mm or any two values, such as 8mm, 10mm, 15mm, 20mm, 25mm, 28mm, 30mm, etc.

[0048] In this embodiment, in order to verify the effect of the above parameter limitations on the battery casing provided in this embodiment, as shown in Table 2, four sets of embodiments and four sets of comparative examples are provided for verification.

[0049] Table 2 A comparison of Examples 5 to 8 with Comparative Examples 5 to 6 reveals that when the ratio of the width L1 of the connecting end plate 1 along the first direction to the spacing A1 of the middle side plates 213 of the two expansion portions 21 along the first direction is less than the minimum value in the range 0.3≤L1 / A1≤0.65, the width of the connecting end plate 1 along the first direction is too small, resulting in the spacing between the expansion portions 21 on both sides of the connecting end plate 1 being too short. This causes the mounting through hole 100 for installing the explosion-proof valve on the connecting side plate 214 to be too close to the battery cover plate connected to the connecting opening 221, which can easily damage the battery cover plate in the event of thermal runaway. When the ratio of the width L1 of the connecting end plate 1 along the first direction to the spacing A1 of the middle side plates 213 of the two expansion portions 21 along the first direction is greater than the maximum value in the range 0.3≤L1 / A1≤0.65, the connecting end plate 1 is too long and narrow, resulting in poor structural strength and easy breakage.

[0050] A comparison of Examples 5 to 8 with Comparative Examples 7 to 8 reveals that when the difference between the width dimension L1 of the connecting end plate 1 along the first direction and the width dimension L2 of the connecting top plate 224 along the first direction is less than the minimum value of the range 8mm≤L1-L2≤30mm, the connecting opening 221 is too large, resulting in dimensional redundancy in the corresponding battery cover and high manufacturing costs. When the difference between the width dimension L1 of the connecting end plate 1 along the first direction and the width dimension L2 of the connecting top plate 224 along the first direction is greater than the maximum value of the range 8mm≤L1-L2≤30mm, the space within the connecting portion 22 for expanding the battery electrode assembly is insufficient, making it difficult to meet the energy supply requirements.

[0051] Optionally, such as Figure 3 and Figure 6 As shown, the spacing between the connecting top plates 224 of the two connecting parts 22 along the second direction is A2, and satisfies 40mm≤A2-A1≤150mm.

[0052] By limiting the difference between the spacing dimension A2 of the connecting top plate 224 of the two connecting parts 22 along the second direction and the spacing dimension A1 of the middle side plate 213 of the two expansion parts 21 along the first direction, so that it satisfies 40mm≤A2-A1≤150mm, it can prevent the size of the connecting part 22 along the second direction from being too small due to the difference being too small, resulting in insufficient area of ​​the connecting opening 221 for setting the battery cover, and the area of ​​the battery cover not being able to meet the overcurrent requirements. It can also avoid the imbalance of the size ratio between the connecting part 22 and the expansion part 21 due to the difference being too large, which would make the battery casing difficult to process.

[0053] The difference between the spacing dimension A2 of the connecting top plate 224 of the two connecting parts 22 along the second direction and the spacing dimension A1 of the middle side plate 213 of the two expansion parts 21 along the first direction can be any value between 40mm and 150mm or any range between two values, such as 40mm, 60mm, 80mm, 100mm, 120mm, 140mm, 150mm, etc.

[0054] Optionally, such as Figure 3 and Figure 6 As shown, the distance between the connecting top plate 224 of the connecting part 22 and the connecting end plate 1 along the second direction is F, and satisfies 0.5≤2F / A2≤0.75.

[0055] By limiting the ratio of twice the distance F between the connecting top plate 224 of the connecting part 22 and the connecting end plate 1 along the second direction to the distance A2 between the connecting top plates 224 of the two connecting parts 22 along the second direction, such that 0.5≤2F / A2≤0.75, it can prevent the solid area of ​​the connecting end plate 1 along the second direction from being too narrow due to an excessively small ratio, resulting in poor structural strength and easy breakage. It can also avoid the connecting end plate 1 compressing the area of ​​the connecting opening 221 used to install the battery cover due to an excessively large ratio, resulting in the area of ​​the battery cover used for current passage not meeting the usage requirements.

[0056] The ratio of twice the distance F between the connecting top plate 224 of the connecting part 22 and the connecting end plate 1 along the second direction to the distance A2 between the connecting top plates 224 of the two connecting parts 22 along the second direction can be any value between 0.5 and 0.75 or any two values, such as 0.5, 0.55, 0.6, 0.65, 0.7, 0.72, 0.75, etc.

[0057] In this embodiment, in order to verify the effect of the above parameter limitations on the battery casing provided in this embodiment, as shown in Table 3, four sets of embodiments and four sets of comparative examples are provided for verification.

[0058] Table 3 A comparison of Examples 9 to 12 with Comparative Examples 9 to 10 reveals that when the difference between the spacing A2 of the connecting top plates 224 of the two connecting parts 22 along the second direction and the spacing A1 of the middle side plates 213 of the two expansion parts 21 along the first direction is less than the minimum value of the range 40mm≤A2-A1≤150mm, the size of the connecting part 22 along the second direction is too small, resulting in insufficient area for the connecting opening 221 to accommodate the battery cover, and the area of ​​the battery cover cannot meet the overcurrent requirements; when the difference between the spacing A2 of the connecting top plates 224 of the two connecting parts 22 along the second direction and the spacing A1 of the middle side plates 213 of the two expansion parts 21 along the first direction is greater than the maximum value of the range 40mm≤A2-A1≤150mm, the size ratio of the connecting part 22 and the expansion part 21 is unbalanced, resulting in high processing difficulty and difficulty in processing the battery casing.

[0059] A comparison of Examples 9 to 12 with Comparative Examples 11 to 12 reveals that when the ratio of twice the distance F between the connecting top plate 224 of the connecting part 22 and the connecting end plate 1 along the second direction to the distance A2 between the connecting top plates 224 of the two connecting parts 22 along the second direction is less than the minimum value in the range 0.5 ≤ 2F / A2 ≤ 0.75, the solid area of ​​the connecting end plate 1 along the second direction is too narrow, resulting in poor structural strength and making it prone to breakage. When the ratio of twice the distance F between the connecting top plate 224 of the connecting part 22 and the connecting end plate 1 along the second direction to the distance A2 between the connecting top plates 224 of the two connecting parts 22 along the second direction is greater than the maximum value in the range 0.5 ≤ 2F / A2 ≤ 0.75, the connecting end plate 1 compresses the area of ​​the connecting opening 221 used for setting the battery cover, causing the area of ​​the battery cover used for current passage to not meet the usage requirements.

[0060] In this embodiment, a battery is also provided, comprising a battery cover, battery electrode assembly, and the aforementioned battery casing. A battery cover is connected to each connection opening 221 to seal the battery casing, and the battery electrode assembly is placed inside the battery casing. By utilizing the aforementioned battery casing, this battery effectively prevents misalignment after assembly, ensuring structural stability and improving safety and reliability. Furthermore, it allows for installation in irregularly shaped spaces while maintaining a large capacity, offering greater installation flexibility.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery casing, characterized in that, The battery casing includes: Connecting end plate; The outer shell body is a hollow shell structure comprising two expansion sections and two connecting sections arranged in a cross shape. The two expansion sections are spaced apart along a first direction, and the two connecting sections are spaced apart along a second direction. A connecting end plate is connected to one side of the two expansion sections along a third direction. The expansion sections are provided with a first mounting opening on the other side along the third direction. The connecting sections are provided with a connecting opening connected to the battery cover on the side of the third direction near the connecting end plate. The connecting sections are provided with a second mounting opening communicating with the first mounting opening on the other side along the third direction away from the connecting end plate. The first mounting opening and the second mounting opening together form a cross-shaped opening structure. A closed end plate, comprising two first plates and two second plates arranged in a cross shape, wherein the first plates are connected to the first mounting opening and the second plates are connected to the second mounting opening, the first direction is the width direction of the outer shell body, the second direction is the height direction of the outer shell body, and the third direction is the length direction of the outer shell body.

2. The battery casing according to claim 1, characterized in that, The expansion section includes two support panels arranged opposite each other along the second direction, an intermediate side plate disposed between the two support panels and perpendicular to the connecting end plate, and a connecting side plate connecting the intermediate side plate and the connecting end plate. The connecting side plate is obliquely disposed between the intermediate side plate and the connecting end plate.

3. The battery casing according to claim 2, characterized in that, The length of the middle side plate along the third direction is K, and the length of the outer shell body along the third direction is E, satisfying 0.6≤K / E≤0.

8.

4. The battery casing according to claim 2, characterized in that, The height dimension of the middle side plate along the second direction is W, and it satisfies 25mm≤W≤120mm.

5. The battery casing according to claim 2, characterized in that, The width dimension of the connecting end plate along the first direction is L1, and the distance dimension between the middle side plates of the two expansion parts along the first direction is A1, and satisfies 0.3≤L1 / A1≤0.

65.

6. The battery casing according to claim 5, characterized in that, The connecting part includes two side end plates arranged opposite each other along the first direction and connected to the bearing panel, and a connecting top plate vertically connected between the two side end plates. The width dimension of the connecting top plate along the first direction is L2, and satisfies 8mm≤L1-L2≤30mm.

7. The battery casing according to claim 6, characterized in that, The distance between the connecting top plates of the two connecting parts along the second direction is A2, and satisfies 40mm≤A2-A1≤150mm.

8. The battery casing according to claim 7, characterized in that, The distance between the connecting top plate and the connecting end plate of the connecting part along the second direction is F, and satisfies 0.5≤2F / A2≤0.

75.

9. The battery casing according to claim 2, characterized in that, The first plate, the second plate, and the connecting side plate are all provided with mounting through holes for installing explosion-proof valves.

10. A battery, characterized in that, The battery includes a battery cover, a battery electrode assembly, and a battery housing as described in any one of claims 1-9. The battery cover is connected to each of the connection openings to close the battery housing, and the battery electrode assembly is placed inside the battery housing.

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