Battery and electric equipment

Abstract

The utility model provides a battery and electric equipment. The battery comprises a shell, a roll core assembly and a cover plate, a mounting cavity is formed in the shell, the roll core assembly is arranged in the mounting cavity, the cover plate is connected to the shell, and at least part of the cover plate protrudes towards the interior of the mounting cavity and abuts against the roll core assembly. According to the battery disclosed by the utility model, the roll core can be limited and fixed by utilizing the cover plate, the mounting stability of the roll core assembly is ensured, and compared with the prior art that the roll core assembly is limited by utilizing a rolling groove formed in the shell, the shell disclosed by the invention does not need to form the rolling groove, so that the situation that the shell is stretched due to the formation of the rolling groove is avoided; the surface coating of the shell is prevented from being thinned, and the performance of the battery is improved.

Description

Technical Field

[0001] This application relates to the field of battery structure technology, specifically to batteries and electrical equipment. Background Technology

[0002] Batteries are widely used in energy storage systems, transportation, and consumer electronics. A battery mainly consists of a casing, cover, and core.

[0003] 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. Utility Model Content

[0004] Embodiments of this application provide a battery and an electrical device that can improve the technical problem of thinning of the surface coating of the casing, which affects battery performance.

[0005] In a first aspect, embodiments of this application provide a battery, comprising:

[0006] The housing has a mounting cavity.

[0007] The winding core assembly is disposed 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] In one embodiment, the cover plate includes a main body portion, 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 portion and abuts against the core assembly.

[0010] In one embodiment, the outer sidewall of the housing is a planar structure; and / or, the inner sidewall of the housing includes a first connecting surface connected 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.

[0011] In one embodiment, the side of the recess opposite to the main body abuts against the inner wall surface of the housing.

[0012] In one embodiment, the recess 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.

[0013] In one embodiment, 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.

[0014] In one embodiment, the inner sidewall 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.

[0015] In one embodiment, the core assembly includes a core and a manifold, the manifold being connected to the side of the core opposite to the inner bottom wall of the housing, and at least a portion of the cover plate abutting against the side of the manifold opposite to the core.

[0016] In one embodiment, the manifold includes a first contact portion connected to the cover plate and a second contact portion connected to the tab of the winding core. The first contact portion is made of the same material as the cover plate, and the second contact portion is made of the same material as the tab of the winding core.

[0017] In one embodiment, 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 serving to separate the busbar and the housing.

[0018] In one embodiment, the manifold has a first through hole and a plurality of through holes, the plurality of through holes being arranged around the first through hole, and each through hole including a first hole portion and a second hole portion, the second hole portion being located between the first hole portion and the first through hole;

[0019] Along the direction from the first hole to the first through hole, the cross-sectional area of ​​the second hole gradually decreases.

[0020] In one embodiment, the cover plate has a second through hole, and the battery further includes a seal connected to the side of the cover plate opposite to the winding core assembly, the seal being used to seal the second through hole.

[0021] Secondly, embodiments of this application provide an electrical device including the battery described above.

[0022] The beneficial effects of the embodiments of this application are as follows:

[0023] In the embodiments of this application, the cover plate and the housing are connected. The protruding structure of the cover plate protrudes into the mounting cavity. Since the winding core assembly is located in the mounting cavity, the protruding structure of the cover plate abuts against the winding core assembly in the mounting cavity, thereby limiting the position of the winding core assembly. In other words, this application can use the cover plate to limit and fix the winding core, ensuring the installation stability of the winding core assembly. Compared with the related technology that uses the groove formed by the housing to limit the winding core assembly, the housing of this application does not need to form a groove, thus avoiding the housing being stretched due to the formation of a groove, preventing the surface coating of the housing from becoming thinner, and improving the performance of the battery. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of this application;

[0026] Figure 2 This is a cross-sectional view of the battery provided in an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the battery welding provided in an embodiment of this application, where the black areas represent the welding positions;

[0028] Figure 4 An exploded view of the battery structure provided for an embodiment of this application;

[0029] Figure 5 A schematic diagram of the structure of the busbar provided in an embodiment of this application. Detailed Implementation

[0030] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0031] The following is combined with Figures 1 to 5 This application describes the battery and electrical device.

[0032] According to the embodiments of the first aspect of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 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.

[0033] 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.

[0034] 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.

[0035] In some examples, the cover plate 3 is connected to the open end of the housing 1.

[0036] 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.

[0037] Specifically, 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.

[0038] Specifically, 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, ensuring the airtightness of the battery.

[0039] 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.

[0040] 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.

[0041] In some examples, the side of housing 1 opposite to the inner bottom wall of housing 1 is connected to the connecting part 33.

[0042] Specifically, the outer wall of shell 1 is a planar structure.

[0043] 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.

[0044] Specifically, the inner wall of the housing 1 includes a first connecting surface 13 that connects 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 be thinned due to stretching caused by the formation of grooves, thus ensuring the performance of the battery.

[0045] Specifically, 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 will not protrude from the outer wall surface of the housing 1, ensuring the structural flatness of the battery.

[0046] Specifically, the side of the recessed portion 32 that is away from the main body portion 31 abuts against the inner wall surface of the housing 1.

[0047] 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.

[0048] 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.

[0049] Specifically, a receiving space 4 is formed between the main body 31 and the core assembly 2.

[0050] It is understandable that a certain amount of gas will be generated during normal operation of the battery. The containment space 4 can be used to 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.

[0051] Understandably, the containment space 4 can also be used to contain the electrolyte.

[0052] Specifically, a groove 5 is formed on the side of the cover plate 3 opposite to the core assembly 2.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] It is understandable that the busbar 22 is connected to the tab through the second contact part, and the second contact part and the tab are made of the same material, which can prevent potential corrosion at the connection between the busbar 22 and the tab due to different materials.

[0062] In some cases, the material of the second contact is, for example, copper.

[0063] 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.

[0064] In some embodiments, the busbar 22 is spaced apart from the housing 1.

[0065] Understandably, by spacing the busbar 22 and the housing 1 apart, 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 battery's insulation.

[0066] In some embodiments, the battery further includes an insulating separator disposed between the busbar 22 and the housing 1, the insulating separator serving to separate the busbar 22 and the housing 1.

[0067] 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.

[0068] 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 be used to accommodate the insulating separator, so that the insulating separator can be set between the busbar 22 and the housing 1.

[0069] In some examples, the insulating separator is, for example, insulating tape or insulating pad.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In some examples, the ratio of the length to the width of the through hole 222 is between 8 and 9.

[0077] In some embodiments, the cover plate 3 is formed with a second through hole 34.

[0078] 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.

[0079] 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.

[0080] Specifically, the battery also includes a seal 7, which is connected to the side of the cover plate 3 away from the winding core assembly 2. The seal 7 is used to seal the second through hole 34, ensuring the airtightness of the cover plate 3.

[0081] 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.

[0082] 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 partial welding.

[0083] In some examples, the seal 7 is fixed to the second through hole 34 by adhesive bonding.

[0084] According to an embodiment of the second aspect of this application, the electrical device includes the battery described above.

[0085] 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.

[0086] 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.

[0087] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery, characterized in that, include: 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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 facing away from the inner bottom wall is welded to the cover plate.

8. The battery according to any one of claims 1 to 6, characterized in that, 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, characterized in that, The manifold includes a first contact portion connected to the cover plate and a second contact portion connected to the tab of the winding core. The first contact portion is made of the same material as the cover plate, and the second contact portion is made of the same material as the tab of the winding core.

10. The battery according to claim 8, characterized in that, 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 used to separate the busbar and the housing.

11. The battery according to claim 8, characterized in that, 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. Along the direction from the first hole to the first through hole, the cross-sectional area of ​​the second hole gradually decreases.

12. The battery according to any one of claims 1 to 6, characterized in that, 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 used to seal the second through hole.

13. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1 to 12.

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