Battery and electric device

Abstract

The present application provides a battery and an electric device. The battery comprises a case, a jelly roll assembly and a cover plate; the case is provided with a mounting cavity, the jelly roll assembly is arranged in the mounting cavity; the cover plate is connected to the case; and at least part of the cover plate protrudes into the mounting cavity and abuts against the jelly roll assembly.

Description

Batteries and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202520282078.0, filed on February 20, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery structure technology, such as batteries and electrical devices. Background Technology

[0003] Batteries are widely used in energy storage systems, transportation, and consumer electronics. A battery mainly consists of a casing, cover, and core. Invention Overview

[0004] In related technologies, battery casings are mostly formed using a grooving process to create grooves that protrude into the internal space of the casing, thus limiting the movement of the winding core. However, during the grooving process, the casing is subjected to a certain degree of stretching, resulting in a thinner surface coating and affecting battery performance.

[0005] In a first aspect, this application provides a battery comprising:

[0006] The housing has a mounting cavity.

[0007] The core assembly is located within the mounting cavity;

[0008] A cover plate, connected to the housing, at least a portion of which protrudes into the mounting cavity and abuts against the core assembly.

[0009] Secondly, this application provides an electrical device, including a battery. Beneficial effects

[0010] The battery provided in this application connects a cover plate and a housing. The protruding structure of the cover plate protrudes into the mounting cavity. Since the winding core assembly is located within the mounting cavity, the protruding structure of the cover plate abuts against the winding core assembly inside the mounting cavity, thereby limiting the positioning of the winding core assembly. In other words, this application can achieve the positioning and fixation of the winding core using only the cover plate, ensuring the installation stability of the winding core assembly. Compared to related technologies that use grooves formed in the housing to limit the winding core assembly, the housing in this application does not need to form grooves, thus avoiding the housing being stretched due to the formation of grooves, preventing the surface coating of the housing from thinning, and improving the battery performance. Attached Figure Description

[0011] Figure 1 is a schematic diagram of the battery structure provided in a specific embodiment of this application;

[0012] Figure 2 is a cross-sectional view of the battery provided in a specific embodiment of this application;

[0013] Figure 3 is a schematic diagram of the welding of the battery provided in a specific embodiment of this application. The black part in the figure is the welding position.

[0014] Figure 4 is an exploded view of the battery structure provided in a specific embodiment of this application;

[0015] Figure 5 is a schematic diagram of the structure of the busbar provided in a specific embodiment of this application. Embodiments of the present invention

[0016] The battery and electrical device of this application are described below with reference to Figures 1 to 5.

[0017] According to an embodiment of the first aspect of this application, as shown in Figures 1, 2, 3 and 4, the battery includes a housing 1, a winding assembly 2 and a cover plate 3. The housing 1 has a mounting cavity 11, the winding assembly 2 is disposed in the mounting cavity 11, and the cover plate 3 is connected to the housing 1. At least a portion of the cover plate 3 protrudes into the mounting cavity 11 and abuts against the winding assembly 2.

[0018] According to the battery embodiment of this application, the cover plate 3 and the housing 1 are connected. The protruding structure of the cover plate 3 protrudes into the mounting cavity 11. Since the winding core assembly 2 is disposed in the mounting cavity 11, the protruding structure of the cover plate 3 abuts against the winding core assembly 2 in the mounting cavity 11, thereby limiting the winding core assembly 2. In other words, this application can use the cover plate 3 to limit and fix the winding core 21, ensuring the installation stability of the winding core assembly 2. Compared with the related technology that uses the groove formed by the housing 1 to limit the winding core assembly 2, the housing 1 of this application does not need to form a groove, thereby avoiding the situation where the housing 1 is stretched due to the formation of the groove, preventing the surface coating of the housing 1 from becoming thinner, and improving the performance of the battery.

[0019] Understandably, in related technologies, batteries primarily use grooves formed in the housing 1 to limit and fix the core assembly 2. This can easily cause the housing 1 to be stretched during the formation of the grooves, resulting in a thinner surface coating. Furthermore, since the grooves are generally formed on the sidewalls of the housing 1, meaning there is a certain distance between the grooves and the top of the housing 1, the space within the housing 1 available for arranging the core 21 is limited to the space between the grooves and the inner bottom wall of the housing 1, thus restricting the height of the core 21. This application configures at least a portion of the cover plate 3 to protrude into the mounting cavity 11, allowing the cover plate 3 to abut against the core assembly 2 to limit and fix it. Simultaneously, the groove structure of the housing 1 can be eliminated, preventing the housing 1 from being stretched due to the formation of the grooves, preventing the surface coating of the housing 1 from thinning, improving battery performance, and increasing the utilization rate of the internal space of the housing 1, which is beneficial for increasing the height of the core assembly 2.

[0020] In some examples, the cover plate 3 is connected to the opening end of the housing 1.

[0021] In some embodiments, the cover plate 3 is fixedly connected to the housing 1 by welding. For example, the welding may be laser welding, and the welding method may be peripheral welding. It should be noted that this is merely an illustrative example of the connection method between the cover plate 3 and the housing 1, and is not a specific limitation. For example, the cover plate 3 may also be connected to the housing 1 by an interference fit.

[0022] In some embodiments, the inner wall of the housing 1 is welded to the cover plate 3, so that the cover plate 3 is fixedly connected to the inner wall of the housing 1, and the connection between the cover plate 3 and the inner wall of the housing 1 is sealed, thereby ensuring the sealing of the battery.

[0023] In some embodiments, the housing 1 has an opening 12, the core assembly 2 is located between the opening 12 and the inner bottom wall of the housing 1, and the end of the housing 1 facing away from the inner bottom wall is welded to the cover plate 3, so that the cover plate 3 is fixedly connected to the opening end of the housing 1. The cover plate 3 can seal the opening 12 of the housing 1, thus ensuring the airtightness of the battery.

[0024] In some embodiments, the cover plate 3 includes a main body portion 31, a recessed portion 32 and a connecting portion 33 connected in sequence. The connecting portion 33 is connected to the housing 1. The recessed portion 32 protrudes into the mounting cavity 11 relative to the main body portion 31. The recessed portion 32 abuts against the core assembly 2.

[0025] It is understandable that the connecting part 33 is connected to the housing 1 to achieve the connection between the cover plate 3 and the housing 1. The recessed part 32 protrudes into the mounting cavity 11 relative to the main body part 31. When the connecting part 33 is connected to the housing 1, the recessed part 32 abuts against the core assembly 2, and the recessed part 32 can limit and fix the core assembly 2. This allows the cover plate 3 to abut against the core assembly 2 to achieve the limiting and fixing of the core assembly 2. At the same time, the groove structure of the housing 1 can be eliminated, avoiding the housing 1 from being stretched due to the formation of the groove, preventing the surface coating of the housing 1 from becoming thinner, improving the performance of the battery, and also increasing the utilization rate of the internal space of the housing 1, which is beneficial to increasing the height of the core assembly 2.

[0026] In some examples, the side of housing 1 opposite to the inner bottom wall of housing 1 is connected to the connecting part 33.

[0027] In some embodiments, the outer wall of the housing 1 has a planar structure.

[0028] It is understandable that the outer wall of the casing 1 is a planar structure, that is, the casing 1 does not have a groove structure. The outer wall surface of the casing 1 is a complete plane, which means that the surface coating of the casing 1 will not be thinned due to stretching caused by the formation of grooves, thus ensuring the performance of the battery.

[0029] In some embodiments, the inner wall of the housing 1 includes a first connecting surface 13 connected to the cover plate 3, and the first connecting surface 13 is a plane. That is, the connection between the housing 1 and the cover plate 3 is a planar structure. In other words, no groove is formed at the connection between the housing 1 and the cover plate 3, and the surface coating of the housing 1 will not become thin due to stretching caused by the formation of grooves, thus ensuring the performance of the battery.

[0030] In some embodiments, the side of the connecting portion 33 facing away from the main body portion 31 is flush with the outer wall surface of the housing 1. That is, along the radial direction of the mounting cavity 11, the connecting portion 33 does not protrude from the outer wall surface of the housing 1, ensuring the structural flatness of the battery.

[0031] In some embodiments, the side of the recess 32 opposite to the main body 31 abuts against the inner wall surface of the housing 1.

[0032] It is understandable that the recessed portion 32 is limited by the inner wall surface of the housing 1 and cannot move radially, thereby achieving radial positioning of the cover plate 3 and improving the installation stability of the cover plate 3.

[0033] In some examples, the recess 32 includes a second connecting surface 321 that abuts against the inner wall surface of the housing 1. The shape of the second connecting surface 321 matches the shape of the inner wall surface of the housing 1, so that the recess 32 can fit better against the inner wall surface of the housing 1, thereby improving the sealing performance of the connection between the recess 32 and the inner wall surface of the housing 1.

[0034] In some embodiments, a receiving space 4 is formed between the main body 31 and the core assembly 2.

[0035] It is understandable that a certain amount of gas will be generated during normal operation of the battery. The containment space 4 can contain the gas generated during normal operation of the battery, which can prevent the internal gas pressure from being too high during normal operation of the battery.

[0036] Understandably, the storage space 4 can also hold the electrolyte.

[0037] In some embodiments, a groove 5 is formed on the side of the cover plate 3 opposite to the core assembly 2.

[0038] Understandably, a groove 5 is formed on the side of the cover plate 3 away from the core assembly 2. The groove 5 can reduce the overall weight of the cover plate 3. Moreover, since the groove 5 is on the side of the cover plate 3 away from the core assembly 2, that is, the groove 5 is exposed, it is convenient for users or operating equipment to grip the cover plate 3 using the groove 5.

[0039] In some examples, the groove 5 is formed on the side of the recess 32 away from the core assembly 2, which can reduce the weight of the recess 32.

[0040] It is understandable that the groove 5 is formed on the side of the concave portion 32 away from the core assembly 2, which can avoid the groove 5 affecting the limiting of the core assembly 2. That is, the setting of the groove 5 will not reduce the contact area between the concave portion 32 and the core assembly 2.

[0041] In some embodiments, the core assembly 2 includes a core 21 and a manifold 22, the manifold 22 being connected to the side of the core 21 away from the inner bottom wall of the housing 1, and at least a portion of the cover plate 3 abutting against the side of the manifold 22 away from the core 21.

[0042] It is understood that the busbar 22 is located between the cover plate 3 and the winding core 21, and at least a portion of the cover plate 3 abuts against the side of the busbar 22 away from the winding core 21. The cover plate 3 cooperates with the inner bottom wall of the housing 1 to clamp the busbar 22 and the winding core 21, thus achieving a limiting and fixing effect on them. Consequently, the housing 1 does not need to form a groove, avoiding the stretching that would occur due to the groove formation, preventing the surface coating of the housing 1 from thinning, and improving battery performance. This allows the cover plate 3 to abut against the winding core assembly 2 to achieve a limiting and fixing effect on it. Simultaneously, the groove structure of the housing 1 can be eliminated, preventing the stretching that would occur due to the groove formation, preventing the surface coating of the housing 1 from thinning, improving battery performance, and increasing the utilization rate of the internal space of the housing 1, which is beneficial for increasing the height of the winding core assembly 2.

[0043] In some examples, the recess 32 is fixedly connected to the busbar 22 by welding. Exemplary examples include laser welding, and welding methods such as peripheral welding or partial welding. It should be noted that this is merely an illustrative example of the connection method between the recess 32 and the busbar 22, and is not a specific limitation. For example, the recess 32 can also be connected to the busbar 22 by snap-fit.

[0044] In some embodiments, the busbar 22 includes a first contact portion connected to the cover plate 3 and a second contact portion connected to the tab of the core 21. The first contact portion is made of the same material as the cover plate 3, and the second contact portion is made of the same material as the tab of the core 21.

[0045] It is understandable that the busbar 22 is connected to the cover plate 3 through the first contact part, and the first contact part and the cover plate 3 are made of the same material, which can prevent potential difference corrosion from occurring at the connection between the busbar 22 and the cover plate 3 due to the different materials.

[0046] It is understandable that the busbar 22 is connected to the tab through the second contact part, and the second contact part is made of the same material as the tab, which can prevent potential corrosion at the connection between the busbar 22 and the tab due to different materials.

[0047] In some cases, the material of the second contact is, for example, copper.

[0048] In some examples, the busbar 22 is made of composite metal, and the material of the part of the busbar 22 that contacts the cover plate 3 is the same as the material of the cover plate 3. The material of the part of the busbar 22 that contacts the tab of the core 21 is the same as the material of the tab of the core 21.

[0049] In some embodiments, the busbar 22 is spaced apart from the housing 1.

[0050] It is understandable that by setting the busbar 22 and the housing 1 at an interval, direct contact between the busbar 22 and the housing 1 can be avoided, preventing short circuits between the positive and negative terminals of the battery and ensuring the insulation of the battery.

[0051] In some embodiments, the battery further includes an insulating separator disposed between the busbar 22 and the housing 1, the insulating separator being configured to separate the busbar 22 and the housing 1.

[0052] It is understandable that the insulating separator is placed between the busbar 22 and the housing 1 so that the insulating separator can insulate and separate the busbar 22 and the housing 1, avoid electrical connection between the busbar 22 and the housing 1, prevent short circuit between the positive and negative terminals of the battery, and ensure the insulation of the battery.

[0053] It is understandable that the busbar 22 and the housing 1 are spaced apart, that is, a gap 6 is formed between the busbar 22 and the housing 1. The gap 6 can accommodate the insulating separator, so that the insulating separator can be set between the busbar 22 and the housing 1.

[0054] In some examples, the insulating separator is, for example, insulating tape or insulating pad.

[0055] In some embodiments, the manifold 22 is formed with a first through hole 221 and a plurality of through holes 222. The plurality of through holes 222 are arranged around the first through hole 221. The through hole 222 includes a first hole portion 2221 and a second hole portion 2222. The second hole portion 2222 is located between the first hole portion 2221 and the first through hole 221.

[0056] Along the direction from the first hole 2221 to the first through hole 221, the cross-sectional area of ​​the second hole 2222 gradually decreases.

[0057] It is understandable that by forming multiple through holes 222 in the busbar 22, when the battery experiences thermal runaway, the structure between the through holes 222 and the first through hole 221 will break under the impact of high-temperature gas, thereby causing the busbar 22 to unfold and the high-temperature gas to be discharged through the busbar 22.

[0058] It is understandable that the part of the through hole 222 near the first through hole 221 is the second hole portion 2222. The cross-sectional area of ​​the second hole portion 2222 is set to gradually decrease, that is, the end of the through hole 222 near the first through hole 221 is a pointed structure. Therefore, when the battery experiences thermal runaway, the stress at the end of the through hole 222 near the first through hole 221 is more concentrated, which is conducive to the structural breakage between the through hole 222 and the first through hole 221.

[0059] In some examples, the busbar 22 includes a partition 223 located between the first through hole 221 and the through hole 222. When the battery experiences thermal runaway, the partition 223 will break under the action of the high-temperature gas generated by the battery thermal runaway.

[0060] In some examples, the busbar 22 includes a plurality of pressure relief plates 224, with a through hole 222 formed between two adjacent pressure relief plates 224. When the battery experiences thermal runaway, the pressure relief plates 224 will fold under the impact of the high-temperature gas generated by the battery thermal runaway, causing the busbar 22 to unfold, thereby allowing the high-temperature gas generated by the battery thermal runaway to be discharged through the busbar 22.

[0061] In some examples, the ratio of the length to the width of the through hole 222 is between 8 and 9.

[0062] In some embodiments, the cover plate 3 is formed with a second through hole 34.

[0063] It is understandable that by providing a second through hole 34 in the cover plate 3 that communicates with the mounting cavity 11, liquid can be injected into the mounting cavity 11 through the second through hole 34.

[0064] It is understandable that when the battery experiences thermal runaway, the high-temperature gas generated by the thermal runaway can be discharged through the second through-hole 34 to relieve the pressure of the battery.

[0065] In some embodiments, the battery further includes a seal 7 connected to the side of the cover plate 3 away from the winding core assembly 2. The seal 7 is configured to seal the second through hole 34, thereby ensuring the airtightness of the cover plate 3.

[0066] Understandably, the seal 7 can seal the second through hole 34 to prevent electrolyte leakage from the second through hole 34 during normal battery use, thus ensuring the stability of the battery.

[0067] In some examples, the seal 7 is fixed to the second through hole 34 by welding. The welding can be laser welding, and the welding method can be peripheral welding or local welding.

[0068] In some examples, the seal 7 is fixed to the second through hole 34 by adhesive bonding.

[0069] According to an embodiment of the second aspect of this application, the electrical device includes a battery.

[0070] According to the embodiments of this application, the electrical device connects the cover plate 3 and the housing 1. The protruding structure of the cover plate 3 protrudes into the mounting cavity 11. Since the core assembly 2 is located in the mounting cavity 11, the protruding structure of the cover plate 3 abuts against the core assembly 2 in the mounting cavity 11, thereby limiting the position of the core assembly 2. In other words, this application can use the cover plate 3 to limit and fix the core 21, ensuring the installation stability of the core assembly 2. Compared with the related technology that uses the groove formed by the housing 1 to limit the core assembly 2, the housing 1 of this application does not need to form a groove, thus avoiding the situation where the housing 1 is stretched due to the formation of the groove, preventing the surface coating of the housing 1 from becoming thinner, improving the performance of the battery, and thus ensuring the performance of the electrical device.

[0071] It should be noted that electrical equipment can be vehicles, aircraft, or household appliances. It is important to note that the above examples are merely illustrative and do not impose any specific limitations on the types of electrical equipment used.

Claims

1. A battery, comprising: The housing has a mounting cavity. The winding core assembly is disposed within the mounting cavity; A cover plate, connected to the housing, at least a portion of which protrudes into the mounting cavity and abuts against the core assembly.

2. The battery according to claim 1, wherein, The cover plate includes a main body, a recessed portion, and a connecting portion connected in sequence. The connecting portion is connected to the housing. The recessed portion protrudes into the mounting cavity relative to the main body and abuts against the core assembly.

3. The battery according to claim 2, wherein, The outer side wall of the housing is a planar structure; and / or, the inner side wall of the housing includes a first connecting surface that connects to the cover plate, the first connecting surface being planar; and / or, the side of the connecting portion opposite to the main body is flush with the outer wall surface of the housing.

4. The battery according to claim 2, wherein, The concave portion on the side opposite to the main body abuts against the inner wall surface of the housing.

5. The battery according to claim 4, wherein, The recessed portion includes a second connecting surface that abuts against the inner wall surface of the housing, the shape of the second connecting surface matching the shape of the inner wall surface of the housing.

6. The battery according to claim 2, wherein, A receiving space is formed between the main body and the core assembly; and / or, a groove is formed on the side of the cover plate opposite to the core assembly.

7. The battery according to any one of claims 1 to 6, wherein, The inner wall of the housing is welded to the cover plate; And / or, the housing has an opening, the core assembly is located between the opening and the inner bottom wall of the housing, and the end of the housing opposite to the inner bottom wall is welded to the cover plate.

8. The battery according to any one of claims 1 to 6, wherein, The core assembly includes a core and a manifold, the manifold being connected to the side of the core away from the inner bottom wall of the housing, and at least a portion of the cover plate abutting against the side of the manifold away from the core.

9. The battery according to claim 8, wherein, The manifold includes a first contact portion connected to the cover plate and a second contact portion connected to the tabs of the winding core, wherein... The first contact portion is made of the same material as the cover plate; and / or, The second contact portion is made of the same material as the tab of the winding core.

10. The battery according to claim 8, wherein, The busbar is spaced apart from the housing; and / or, the battery further includes an insulating separator disposed between the busbar and the housing, the insulating separator being configured to separate the busbar and the housing.

11. The battery according to claim 8, wherein, The manifold has a first through hole and a plurality of through holes. The plurality of through holes are arranged around the first through hole. Each through hole includes a first hole portion and a second hole portion, with the second hole portion located between the first hole portion and the first through hole.

12. The battery according to claim 11, wherein, Along the direction from the first hole to the first through hole, the cross-sectional area of ​​the second hole gradually decreases.

13. The battery according to any one of claims 1 to 6, wherein, The cover plate has a second through hole, and the battery also includes a sealing element connected to the side of the cover plate away from the winding core assembly. The sealing element is configured to seal the second through hole.

14. An electrical appliance comprising a battery as described in any one of claims 1 to 13.

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