WO2023202466A1 - 一种电池外壳、电池及电子设备 - Google Patents

一种电池外壳、电池及电子设备 Download PDF

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Publication number
WO2023202466A1
WO2023202466A1 PCT/CN2023/088143 CN2023088143W WO2023202466A1 WO 2023202466 A1 WO2023202466 A1 WO 2023202466A1 CN 2023088143 W CN2023088143 W CN 2023088143W WO 2023202466 A1 WO2023202466 A1 WO 2023202466A1
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WO
WIPO (PCT)
Prior art keywords
side wall
bracket
battery
wall
equal
Prior art date
Application number
PCT/CN2023/088143
Other languages
English (en)
French (fr)
Inventor
汤国胜
梁立维
马陈冲
张剑
欧阳进忠
Original Assignee
比亚迪股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Publication of WO2023202466A1 publication Critical patent/WO2023202466A1/zh

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings; Jackets or wrappings
    • H01M50/102Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings; Jackets or wrappings
    • H01M50/147Lids or covers
    • H01M50/148Lids or covers characterised by their shape
    • H01M50/15Lids or covers characterised by their shape for prismatic or rectangular cells
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings; Jackets or wrappings
    • H01M50/147Lids or covers
    • H01M50/166Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Definitions

  • the present disclosure relates to a battery casing, a battery and an electronic device.
  • a battery casing generally includes a casing and a cover.
  • the end of the casing opening is folded toward the outside of the casing to form a flange, and then the edge of the cover is welded to the flange.
  • the length of the flange that is folded outward is smaller, which results in a smaller weldable area between the flange and the cover.
  • the weldable area between the shell and the cover is further reduced, resulting in A reliable sealing connection cannot be formed between the covers.
  • An object of the present disclosure is to provide a new technical solution for battery casings, batteries and electronic devices.
  • a battery housing includes:
  • a housing having a first side wall and a bottom wall, the first side wall being connected to the bottom wall;
  • a bracket is connected to the inner side of the first side wall
  • the cover body has a second side wall and a top wall, the second side wall is connected to the top wall, the end of the second side wall is in contact with the bracket, and the second side wall is connected to the top wall.
  • a side of the side wall facing the first side wall is sealingly connected to a side of the first side wall facing the second side wall, so that the shell The body and the cover body form a sealed space.
  • the height of the second side wall is H1; the bracket has a first end surface that abuts the second side wall. , the distance from the first end surface to the end of the first side wall away from the bottom wall is H2, where H2 is greater than or equal to 0.1 mm, and H2 is less than or equal to H1.
  • the thickness of the second side wall is T1
  • the thickness of the bracket is T2, where T2 is greater than or equal to T1;
  • the thickness of the bracket is T2.
  • the first side wall and the bottom wall are connected by a first chamfered portion.
  • the radius of the first chamfered portion is R1, where T2 is less than or equal to R1.
  • the second side wall and the top wall are connected by a second chamfered portion, the radius of the second chamfered portion is R2, and the thickness of the second side wall is T1;
  • the first side wall and the bottom wall are connected by a first chamfered portion, and the radius of the first chamfered portion is R1; wherein the sum of R2 and T1 is less than or equal to R1.
  • T1 is greater than 0, and T1 is less than or equal to 100 ⁇ m; T2 is greater than or equal to 30 ⁇ m, and T2 is less than or equal to 120 ⁇ m.
  • the second side wall includes a mounting side wall and an avoidance side wall, the height of the avoidance side wall is less than the height of the installation side wall;
  • a connecting portion is provided on the first side wall, and the avoiding side wall corresponds to the connecting portion to avoid the connecting portion.
  • the number of the brackets is at least two, and the at least two brackets are evenly distributed.
  • the number of the first side walls is four, and the number of the brackets is four; every two One of the brackets is provided at the intersection between two adjacent first side walls.
  • the bracket is made of metal, and the bracket is welded or adhesively connected to the first side wall;
  • the bracket is made of non-metallic material, and is injection-molded on the first side wall; or the bracket is adhesively connected to the first side wall.
  • a battery includes the above-mentioned battery shell, and also includes a pole core.
  • the pole core includes a pole core body and a pole tab; the shell and the cover form a sealed space, and the pole core is arranged in the In the sealed space, one end of the pole tab is disposed on the first side wall, and the other end of the pole tab is electrically connected to the pole core body.
  • an electronic device includes the battery described above.
  • a first side wall is provided on the housing
  • a second side wall is provided on the cover
  • the first side wall faces the second side wall and the second side wall faces the first side.
  • the sealing connection between one side of the side wall increases the sealing area of the housing and the cover, ensuring that a reliable sealing connection can be formed between the housing and the cover.
  • FIG. 1 is a cross-sectional view of a battery housing according to an embodiment of the present disclosure.
  • Figure 2 is a cross-sectional view of a housing according to an embodiment of the present disclosure.
  • Figure 3 is a perspective view of a housing according to an embodiment of the present disclosure.
  • FIG 4 is a top view of a battery housing according to an embodiment of the present disclosure.
  • Figure 5 is a perspective view of a battery housing according to an embodiment of the present disclosure.
  • Figure 6 is a perspective view of a cover according to an embodiment of the present disclosure.
  • FIG. 7 is a perspective view of a cover with escape side walls according to an embodiment of the present disclosure.
  • FIG. 8 is a cross-sectional view of a cover according to an embodiment of the present disclosure.
  • any specific values are to be construed as illustrative only and not as limiting. Accordingly, other examples of the exemplary embodiments may have different values.
  • the battery housing includes a housing 1, a bracket 3 and a cover 2.
  • the housing 1 has a first side wall 101 and a bottom wall 102.
  • the first side wall 101 is connected to the bottom wall 102;
  • the bracket 3 Connected to the inside of the first side wall 101;
  • the cover 2 has a second side wall 201 and a top wall 202, the second side wall 201 is connected to the top wall 202, the second side wall 201
  • the end of the bracket 3 is in contact with the bracket 3, and the side of the second side wall 201 facing the first side wall 101 is sealingly connected to the side of the first side wall 101 facing the second side wall 201, So that the housing 1 and the cover 2 form a sealed space.
  • a first side wall 101 is provided on the housing 1 and a second side wall 201 is provided on the cover 2.
  • the side of the first side wall 101 facing the second side wall 201 is connected to the second side wall.
  • the sealing connection between the side of 201 facing the first side wall 101 increases the sealing area of the housing 1 and the cover 2, ensuring that a reliable sealing connection can be formed between the housing 1 and the cover 2.
  • the first side wall 101 and the second side wall 201 are connected through laser welding. Since the embodiment of the present disclosure is sealed through the first side wall 101 and the second side wall 201, the welding area between the two is increased.
  • a bracket 3 is provided inside the first side wall 101 of the casing 1 for positioning the cover 2; in the process of forming a sealed connection between the cover 2 and the casing 1
  • first the end of the second side wall 201 of the cover 2 is abutted against the bracket 3, and then the first side wall 101 and the second side wall 201 are sealed and connected by laser welding or other welding methods.
  • the bracket 3 accurately positions the cover 2, thereby helping to ensure the relative position between the first side wall 101 and the second side wall 201, facilitating a sealed connection between the two, improving the process yield, and effectively ensuring The sealing performance of the battery casing.
  • the peripheral edge of the bottom wall 102 extends to one side of the bottom wall 102 to form a first side wall 101 , thereby forming a housing 1 with an opening on one side.
  • a bracket 3 is provided inside the first side wall 101 .
  • the peripheral edge of the top wall 202 extends to one side of the top wall 202 to form a second side wall 201 , thereby forming the cover 2 with an opening on one side.
  • the housing 1 and the cover 2 are fastened relative to each other, so that the end of the second side wall 201 is against the bracket 3 , and the bottom wall 102 is against the bracket 3 .
  • Top walls 202 are opposite.
  • the first side wall 101 and the second side wall 201 are arranged side by side in the thickness direction, and the outer surface of the first side wall 101 facing the second side wall 201 faces the second side wall 201
  • the outer surfaces of the first side walls 101 are in contact with each other.
  • the overlapping portions of the first side wall 101 and the second side wall 201 are sealingly connected through laser welding or gluing, thereby ensuring the sealing performance of the battery casing of the present disclosure.
  • the height of the second side wall 201 is H1; the bracket 3 has a first end surface that is in contact with the second side wall 201, and the first end surface is away from the bottom wall from the first side wall 101.
  • the distance between the ends of 102 is H2, where H2 is greater than or equal to 0.1mm, and H2 is less than or equal to H1.
  • the length of the second side wall 201 extending away from the top wall 202 is H1.
  • the height H1 of the second side wall 201 , the radius of the second chamfer 5 and the thickness of the top wall 202 are the height of the cover 2 .
  • the length of the second side wall 201 extending into the housing 1 is H2.
  • the end of the second side wall 201 abuts the bracket 3 , the end of the first side wall 101 away from the bottom wall 102 does not exceed the end of the second side wall 201 close to the top wall 202 end, and the height of the overlapping portion between the first side wall 101 and the second side wall 201 is at least 0.1 mm.
  • the end of the second side wall 201 when the end of the second side wall 201 is in contact with the bracket 3, the end of the first side wall 101 away from the bottom wall 102 does not exceed the end of the second side wall 201 that is close to the bracket 3.
  • the end of the top wall 202 prevents the end of the first side wall 101 away from the bottom wall 102 from exceeding the end of the second side wall 201 close to the top wall 202, and then the shell 1 and the cover
  • the poor welding between 2 ensures that the battery casing of the present disclosure can have better sealing performance, and can ensure that the battery casing of the present disclosure has better appearance.
  • H1 is greater than or equal to 0.2mm. It is beneficial to further increase the overlapping area between the first side wall 101 and the second side wall 201, ensuring that there is sufficient area between the two for sealing, and ensuring that the battery casing of the present disclosure has reliable sealing performance.
  • the thickness of the second side wall 201 is T1
  • the thickness of the bracket 3 is T2, where T2 is greater than or equal to T1;
  • the thickness of the bracket is T2.
  • the first side wall 101 and the bottom wall 102 are connected by a first chamfer 4.
  • the radius of the first chamfer 4 is R1, where T2 is less than or Equal to R1.
  • the thickness of the second side wall 201 is T1, and the thickness of the bracket 3 is T2, where T2 is greater than or equal to T1. That is to say, when the end of the second side wall 201 abuts the bracket 3 , the second side wall 201 can be completely located in the corresponding space of the bracket 3 , that is, the second side wall 201
  • the outer surface of the side away from the first side wall 101 is no farther away from the bracket 3 than the The outer surface of one side of the first side wall 101 is on the inner wall of the battery casing, so that the bracket 3 protrudes from the second side wall 201, or the bracket 3 is flush with the second side wall 201.
  • This embodiment prevents the second side wall 201 from being too thick and occupying the sealing space of the battery case 1. On the contrary, this embodiment can increase the sealing space of the battery case, thereby increasing the energy density of the battery.
  • T1 is greater than 0, and T1 is less than or equal to 100 ⁇ m; T2 is greater than or equal to 30 ⁇ m, and T2 is less than or equal to 120 ⁇ m, which can further increase the sealed space formed by the battery shell, which is beneficial to improving the energy density of the battery.
  • the thickness of the bracket is T2.
  • the first side wall 101 and the bottom wall 102 are connected by a first chamfer 4.
  • the radius of the first chamfer 4 is R1, where T2 is less than or Equal to R1.
  • the cross-section of the first chamfer 4 may be arc-shaped or other shapes, and is a transitional connection part between the first side wall 101 and the bottom wall 102 .
  • the first side wall 101, the first chamfered portion 4 and the bottom wall 102 can be integrally formed.
  • the first side wall 101, the first chamfered portion 4 and the bottom wall 102 are made of Sheet stamping and forming.
  • the radius of the first chamfer 4 is R1, and T2 is less than or equal to R1. That is to say, the outer surface of the bracket 3 away from the first side wall 101 does not exceed the end of the first chamfer 4 away from the first side wall 101 , which can prevent the bracket 3 from exceeding the first chamfered portion 4 .
  • the end of the corner 4 away from the first side wall 101 occupies too much of the sealed space in the battery casing, which can improve the energy density of the battery.
  • the first side wall 101 is a flat plate structure
  • the bottom wall 102 is a flat plate structure
  • the first chamfer 4 is arc-shaped. structure, the first side wall 101, the first chamfer 4 and the bottom wall 102 are integrally formed.
  • the second side wall 201 and the top wall 202 are connected by a second chamfer 5, the radius of the second chamfer 5 is R2, and the second side wall has a radius of R2.
  • the thickness is T1; the first side wall 101 and the bottom wall 102 are connected by a first chamfer 4, and the radius of the first chamfer 4 is R1; where the sum of R2 and T1 is less than or Equal to R1.
  • the second chamfer 5 may be in the shape of an arc, and is a transitional connection part between the second side wall 201 and the top wall 202 .
  • the second side wall 201, the second chamfered portion 5 and the top wall 202 can be integrally formed, such as the second side wall 201, the second chamfered portion 5 and the top wall.
  • 202 is stamped from sheet metal.
  • the thickness of the second side wall 201 is T1
  • the first side wall 101 and the bottom wall 102 are connected by a first chamfer 4
  • the radius of the first chamfer 4 is R1
  • the sum of R2 and T1 is less than or equal to R1. That is to say, the projection of the second side wall 201 and the second chamfered portion 5 on the plane of the bottom wall 102 does not exceed the range of the first chamfered portion 4 . This avoids wasting space in the battery casing and increases the energy density of the battery.
  • Part 5 squeezes the battery core to ensure normal use of the battery.
  • the radius of the second chamfer 5 is R2, R2 is greater than or equal to 0.2mm, and R2 is less than or equal to 1mm, and R1 is greater than or equal to 0.2mm, and R1 is less than or equal to 1mm, so that The first chamfering part 4 and the second chamfering part 5 do not waste space in the battery casing, thereby increasing the energy density of the battery.
  • the size of the first chamfering part 4 and the second chamfering part 5 should be as small as possible.
  • the radii of the first chamfering part 4 and the second chamfering part 5 should be equal. is 0.2mm.
  • the second side wall 201 is a flat-plate structure
  • the top wall 202 is a flat-plate structure
  • the second chamfer 5 is an arc-shaped structure
  • the second side wall 201 , the second chamfered portion 5 and the top wall 202 are integrally formed.
  • the second side wall 201 includes a mounting side wall 6 and an avoidance side wall 7.
  • the height of the avoidance side wall 7 is smaller than the height of the installation side wall 6;
  • a connecting portion 8 is provided on the first side wall 101 , and the avoiding side wall 7 corresponds to the connecting portion 8 to avoid the connecting portion 8 .
  • the first side wall 101 of the housing 1 is provided with a connecting portion 8 such as a liquid injection hole and an electrode assembly. Due to the provision of the connecting portion 8, the first side wall 101 of the connecting portion 8 is connected to the first side wall 101 of the housing 1.
  • the height of the connection between the two side walls 201 decreases, that is, H1 decreases.
  • reducing the height of the avoidance side wall 7 on the second side wall 201 corresponding to the connection part 8 can avoid the avoidance side wall 7 and the connection. Part 8 interferes with each other.
  • H1 when the overall height of the battery shell is less than or equal to 8.5mm, H1 is less than or equal to 1.5mm. In addition, when the overall height of the battery increases, H1 can also increase.
  • the number of the brackets 3 is one and the bracket 3 is annular. Bracket 3.
  • the bracket 3 is an integral, annular structure.
  • the bracket 3 with this structure can provide a more precise positioning for the cover 2 and reduce the difficulty of assembly.
  • the bracket 3 can pass between the cover 2 and the housing 1.
  • the bracket 3 of the overall structure can also function as a reinforcing rib to offset the thermal deformation caused by welding.
  • the bracket 3 with an integral structure is more suitable for larger batteries, because when the battery size is larger, the casing 1 will be stretched and twisted, and the bracket 3 with an integral structure can resist tensile deformation.
  • the number of the brackets 3 is at least two, and the at least two brackets 3 are evenly distributed.
  • the brackets 3 exhibit a discretely distributed structure, that is, the brackets 3 are not an integral annular structure, the brackets 3 are small in size, and multiple brackets 3 are evenly spaced among each other.
  • the bracket 3 with such a structure is more suitable for batteries with smaller sizes, because when the size of the battery is smaller, the casing 1 will not be stretched, twisted and deformed. It is more convenient to choose a bracket 3 with discrete distribution and smaller size to process and use better materials. Less, which helps reduce costs.
  • the number of the first side walls 101 is four, and the number of the brackets 3 is four; one is provided at the intersection between every two adjacent first side walls 101 . Said bracket 3.
  • each bracket 3 is connected to two adjacent first side walls 101 , which can improve the strength of the housing 1 while supporting the second side walls 201 .
  • the bracket 3 is made of metal, and the bracket 3 is welded or adhesively connected to the first side wall 101 .
  • the welded connection can achieve a stronger and more reliable connection effect.
  • the bracket 3 is made of non-metallic material and is injection-molded on the first side wall 101; or the bracket 3 is adhesively connected to the first side wall 101.
  • a battery includes the above-mentioned battery casing, and also includes a pole core.
  • the pole core includes a pole core body and pole tabs; the housing 1 and the cover 2 form a sealed space, and the pole core is arranged In the sealed space; one end of the pole tab is disposed on the first side wall 101, and the other end of the pole tab is connected to the pole core body. Electrical connection.
  • the pole tab includes a first pole tab and a second pole tab. One end of the pole is disposed on the first side wall 101 , which means that one end of the first pole is directly connected to the first side wall 101 , and the second pole is connected through the first side wall 101 Part 8 is connected to the pole.
  • the battery according to the embodiment of the present disclosure has better sealing performance and can have higher energy density.
  • an electronic device includes the battery described above.
  • the battery on the electronic device according to the embodiment of the present disclosure has better sealing performance and higher energy density, so that the electronic device has a longer service life.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

一种电池外壳、电池及电子设备。该电池外壳包括壳体,壳体具有第一侧壁和底壁,第一侧壁与底壁连接;支架,支架连接在第一侧壁的内侧;盖体,盖体具有第二侧壁和顶壁,第二侧壁与顶壁连接,第二侧壁的端部与支架抵接,并且第二侧壁朝向第一侧壁的一面与第一侧壁朝向第二侧壁的一面密封连接。

Description

一种电池外壳、电池及电子设备
本公开要求于2022年04月20日提交中国专利局,申请号为202220922155.0,申请名称为“一种电池外壳、电池及电子设备”的中国专利申请的优先权,其全部内容通过引用结合在本公开中。
技术领域
本公开涉及一种电池外壳、电池及电子设备。
背景技术
现有技术中,电池的外壳一般包括壳体和盖体,壳体开口处的端部向壳体外侧翻折形成凸缘,然后将盖体的边缘与凸缘之间焊接。为了保证电池整体具有较小的占用空间,凸缘向外翻折的长度较小,这使凸缘与盖体之间的可焊接面积较小。且由于壳体和盖体的尺寸公差、二者之间的装配公差以及焊接的光波动公差等多种因素使壳体和盖体之间的可焊接区域面积进一步减小,从而导致壳体和盖体之间不能形成可靠的密封连接。
因此,需要提供一种新的技术方案,以解决上述技术问题。
发明内容
本公开的一个目的是提供一种电池外壳、电池及电子设备的新技术方案。
根据本公开的第一方面,提供了一种电池外壳。该电池外壳包括:
壳体,所述壳体具有第一侧壁和底壁,所述第一侧壁与所述底壁连接;
支架,所述支架连接在所述第一侧壁的内侧;
盖体,所述盖体具有第二侧壁和顶壁,所述第二侧壁与所述顶壁连接,所述第二侧壁的端部与所述支架抵接,并且所述第二侧壁朝向所述第一侧壁的一面与所述第一侧壁朝向所述第二侧壁的一面密封连接,以使所述壳 体和所述盖体围设形成密封空间。
可选地,沿所述顶壁至所述第二侧壁的端部的方向,所述第二侧壁的高度为H1;所述支架具有与所述第二侧壁抵接的第一端面,所述第一端面至所述第一侧壁远离所述底壁的端部的距离为H2,其中,H2大于或者等于0.1mm,且H2小于或者等于H1。
可选地,所述第二侧壁的厚度为T1,所述支架的厚度为T2,其中,T2大于或者等于T1;
和/或,
所述支架的厚度为T2,所述第一侧壁和所述底壁之间通过第一倒角部连接,所述第一倒角部的半径为R1,其中,T2小于或者等于R1。
可选地,所述第二侧壁和所述顶壁之间通过第二倒角部连接,所述第二倒角部的半径为R2,所述第二侧壁的厚度为T1;所述第一侧壁和所述底壁之间通过第一倒角部连接,所述第一倒角部的半径为R1;其中,R2与T1之和小于或者等于R1。
可选地,T1大于0,且T1小于或者等于100μm;T2大于或者等于30μm,且T2小于或者等于120μm。
可选地,所述第二侧壁包括安装侧壁和避让侧壁,所述避让侧壁的高度小于所述安装侧壁的高度;
所述第一侧壁上设置有连接部,所述避让侧壁与所述连接部相对应以避让所述连接部。
可选地,所述支架的数量为至少两个,且至少两个所述支架均匀分布。
可选地,所述第一侧壁的数量为4个,所述支架的数量为四个;每两 个相邻第一侧壁之间交界的位置处均设置有一个所述支架。
可选地,所述支架为金属材质,所述支架与所述第一侧壁焊接连接或者粘接连接;
或者,
所述支架为非金属材质,所述支架注塑设置在所述第一侧壁上;或者所述支架与所述第一侧壁粘接连接。
根据本公开的第二方面,提供了一种电池。所述电池包括以上所述的电池外壳,还包括极芯,所述极芯包括极芯本体和极耳;所述壳体和所述盖体围合形成密封空间,所述极芯设置在所述密封空间内;所述极耳的一端设置在所述第一侧壁上,且所述极耳的另一端与所述极芯本体电连接。
根据本公开的第三方面,提供了一种电子设备。所述电子设备包括以上所述的电池。
在本公开实施例中,通过在壳体上设置有第一侧壁,在盖体上设置有第二侧壁,将第一侧壁朝向第二侧壁的一面与第二侧壁朝向第一侧壁的一面之间密封连接,增大了壳体和盖体密封处的面积,保证了壳体和盖体之间能够形成可靠的密封连接。
通过以下参照附图对本公开的示例性实施例的详细描述,本公开的其它特征及其优点将会变得清楚。
附图说明
构成说明书的一部分的附图描述了本公开的实施例,并且连同说明书一起用于解释本公开的原理。
图1是根据本公开实施例电池外壳的剖面图。
图2是根据本公开实施例壳体的剖面图。
图3是根据本公开实施例壳体的立体图。
图4是根据本公开实施例电池外壳的俯视图。
图5是根据本公开实施例电池外壳的立体图。
图6是根据本公开实施例盖体的立体图。
图7是根据本公开实施例具有避让侧壁的盖体的立体图。
图8是根据本公开实施例盖体的剖面图。
附图标记:
1、壳体;101、第一侧壁;102、底壁;2、盖体;201、第二侧壁;
202、顶壁;3、支架;4、第一倒角部;5、第二倒角部;6、安装侧壁;7、避让侧壁;8、连接部。
具体实施方式
现在将参照附图来详细描述本公开的各种示例性实施例。应注意到:除非另外具体说明,否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本公开的范围。
以下对至少一个示例性实施例的描述实际上仅仅是说明性的,决不作为对本公开及其应用或使用的任何限制。
对于相关领域普通技术人员已知的技术和设备可能不作详细讨论,但在适当情况下,所述技术和设备应当被视为说明书的一部分。
在这里示出和讨论的所有例子中,任何具体值应被解释为仅仅是示例性的,而不是作为限制。因此,示例性实施例的其它例子可以具有不同的值。
应注意到:相似的标号和字母在下面的附图中表示类似项,因此,一旦某一项在一个附图中被定义,则在随后的附图中不需要对其进行进一步讨论。
根据本公开的一个实施例,如图1至图6所示,提供了一种电池外壳。该电池外壳包括壳体1、支架3和盖体2,所述壳体1具有第一侧壁101和底壁102,所述第一侧壁101与所述底壁102连接;所述支架3连接在所述第一侧壁101的内侧;所述盖体2具有第二侧壁201和顶壁202,所述第二侧壁201与所述顶壁202连接,所述第二侧壁201的端部与所述支架3抵接,并且所述第二侧壁201朝向所述第一侧壁101的一面与所述第一侧壁101朝向所述第二侧壁201的一面密封连接,以使所述壳体1和所述盖体2围设形成密封空间。
本公开实施例通过在壳体1上设置有第一侧壁101,在盖体2上设置有第二侧壁201,将第一侧壁101朝向第二侧壁201的一面与第二侧壁201朝向第一侧壁101的一面之间密封连接,增大了壳体1和盖体2密封处的面积,保证了壳体1和盖体2之间能够形成可靠的密封连接。比如,第一侧壁101和第二侧壁201之间通过激光焊接连接,由于本公开实施例通过第一侧壁101和第二侧壁201密封连接,增大了二者之间的焊接区域,即使出现壳体1和盖体2的尺寸公差、二者之间的装配公差以及焊接的光波动公差等因素,也能够使盖体2和壳体1之间具有足够的区域进行焊接,保证盖体2和壳体1形成的密封空间的密封性能。同时能够降低焊接精度要求,降低加工制备难度。
另外,在本公开实施例提供的电池外壳中,壳体1的第一侧壁101内侧处设置了用于对盖体2定位的支架3;在盖体2与壳体1形成密封连接的过程中,首先将盖体2的第二侧壁201端部抵接于支架3上,然后再通过激光焊接等焊接方式将第一侧壁101与第二侧壁201进行密封连接。支架3对盖体2起到精准的定位作用,从而有利于确保第一侧壁101和第二侧壁201之间的相对位置,便于二者之间进行密封连接,提升制程良率,有效保证该电池外壳的密封性能。
在一具体的实施方式中,如图3所示,所述底壁102周缘向所述底壁102一侧延伸形成第一侧壁101,进而形成一侧具有敞口的壳体1。在第一侧壁101的内侧设置有支架3。如图6所示,所述顶壁202的周缘向所述顶壁202的一侧延伸形成第二侧壁201,进而形成一侧具有敞口的盖体2。如图1所示,将所述壳体1和所述盖体2敞口相对扣合,使所述第二侧壁201的端部与所述支架3相抵,所述底壁102与所述顶壁202相对。所述第一侧壁101和所述第二侧壁201在厚度方向上并列设置,且所述第一侧壁101朝向所述第二侧壁201的外表面与所述第二侧壁201朝向所述第一侧壁101的外表面相接触。通过激光焊接或者胶粘等方式将所述第一侧壁101和所述第二侧壁201重叠的部分密封连接,确保了本公开的电池外壳的密封性能。
在一个实施例中,沿所述顶壁202至所述第二侧壁201的端部的方向, 所述第二侧壁201的高度为H1;所述支架3具有与所述第二侧壁201抵接的第一端面,所述第一端面至所述第一侧壁101远离所述底壁102的端部的距离为H2,其中,H2大于或者等于0.1mm,且H2小于或者等于H1。
也就是说,如图8所示,所述第二侧壁201向远离所述顶壁202方向延伸的长度为H1。其中,所述第二侧壁201的高度H1、所述第二倒角部5的半径和所述顶壁202的厚度之和为所述盖体2的高度。所述第二侧壁201的端部与所述支架3相抵接时,所述第二侧壁201伸入所述壳体1内的长度为H2。在第二侧壁201的端部与所述支架3抵接时,所述第一侧壁101远离所述底壁102的端部不超过所述第二侧壁201靠近所述顶壁202的端部,且使第一侧壁101与第二侧壁201之间重叠的部分的高度至少为0.1mm。
本实施例中,在第二侧壁201的端部与所述支架3抵接时,所述第一侧壁101远离所述底壁102的端部不超过所述第二侧壁201靠近所述顶壁202端部,避免了所述第一侧壁101远离所述底壁102的端部超过所述第二侧壁201靠近所述顶壁202端部,进而出现壳体1与盖体2之间焊接不良的情况,确保了本公开的电池外壳能够具有较佳的密封性能,且能够确保本公开的电池外壳具有较佳的外观表现力。
在一个实施例中,H1大于或者等于0.2mm。有利于进一步增大第一侧壁101和第二侧壁201之间重叠的区域,确保二者之间有足够的区域进行密封,保证本公开的电池外壳具有可靠的密封性能。
在一个实施例中,所述第二侧壁201的厚度为T1,所述支架3的厚度为T2,其中,T2大于或者等于T1;
和/或,
所述支架的厚度为T2,所述第一侧壁101和所述底壁102之间通过第一倒角部4连接,所述第一倒角部4的半径为R1,其中,T2小于或者等于R1。
所述第二侧壁201的厚度为T1,所述支架3的厚度为T2,其中,T2大于或者等于T1。也就是说,在第二侧壁201的端部抵接在所述支架3上时,能够使第二侧壁201完全位于所述支架3相对应的空间内,即所述第二侧壁201远离所述第一侧壁101的一侧外表面不超过所述支架3远离所 述第一侧壁101的一侧外表面,在电池外壳内壁上,使支架3凸出于第二侧壁201,或者使支架3与第二侧壁201平齐。
本实施例避免了第二侧壁201过厚而占用了电池壳体1的密封空间,相反,本实施例能够增大电池外壳的密封空间,从而提高电池的能量密度。
在一个实施例中,T1大于0,且T1小于或者等于100μm;T2大于或者等于30μm,且T2小于或者等于120μm,能够进一步增大电池外壳形成的密封空间,有利于提高电池的能量密度。
所述支架的厚度为T2,所述第一侧壁101和所述底壁102之间通过第一倒角部4连接,所述第一倒角部4的半径为R1,其中,T2小于或者等于R1。其中,所述第一倒角部4的截面可以为圆弧状等形状,是所述第一侧壁101和所述底壁102之间过渡连接的部分。所述第一侧壁101、所述第一倒角部4和所述底壁102可以一体成型,比如所述第一侧壁101、所述第一倒角部4和所述底壁102由板材冲压成型。
所述第一倒角部4的半径为R1,T2小于或者等于R1。也就是说,所述支架3远离所述第一侧壁101的外表面不超过所述第一倒角部4远离所述第一侧壁101的一端,能够避免所述支架3超过第一倒角部4远离所述第一侧壁101的一端而过多占用电池外壳内的密封空间,能够提高电池的能量密度。
如图1和图2所示,在一个具体实施方式中,所述第一侧壁101为平板状结构,所述底壁102为平板状结构,所述第一倒角部4为圆弧状结构,所述第一侧壁101、所述第一倒角部4和所述底壁102一体成型。
在一个实施例中,所述第二侧壁201和所述顶壁202之间通过第二倒角部5连接,所述第二倒角部5的半径为R2,所述第二侧壁的厚度为T1;所述第一侧壁101和所述底壁102之间通过第一倒角部4连接,所述第一倒角部4的半径为R1;其中,R2与T1之和小于或者等于R1。
所述第二倒角部5可以为圆弧状等形状,是所述第二侧壁201和所述顶壁202之间过渡连接的部分。所述第二侧壁201、所述第二倒角部5和所述顶壁202之间可以一体成型,比如所述第二侧壁201、所述第二倒角部5和所述顶壁202由板材冲压成型。
所述第二侧壁201的厚度为T1,所述第一侧壁101和所述底壁102之间通过第一倒角部4连接,所述第一倒角部4的半径为R1,其中,R2与T1之和小于或者等于R1。也就是说,第二侧壁201和第二倒角部5在所述底壁102所在平面上的投影不超过所述第一倒角部4的范围。避免了电池外壳内的空间浪费,增大了电池的能量密度。同时,使设置在所述底壁102上的电池极芯等部件不会与所述第二侧壁201和所述第二倒角部5发生干涉,避免第二侧壁201和第二倒角部5挤压电池卷芯,确保电池的正常使用。
在一个实施例中,所述第二倒角部5的半径为R2,R2大于或者等于0.2mm,且R2小于或者等于1mm,同时,R1大于或者等于0.2mm,且R1小于或者等于1mm,使所述第一倒角部4和所述第二倒角部5不会使电池外壳内的空间浪费,进而增大了电池的能量密度。其中,所述第一倒角部4和所述第二倒角部5的尺寸应尽可能的小,比如,使所述第一倒角部4和所述第二倒角部5的半径均为0.2mm。
在一个具体实施方式中,所述第二侧壁201为平板状结构,所述顶壁202为平板状结构,所述第二倒角部5为圆弧状结构,所述第二侧壁201、所述第二倒角部5和所述顶壁202一体成型。
在一个实施例中,如图7所示,所述第二侧壁201包括安装侧壁6和避让侧壁7,所述避让侧壁7的高度小于所述安装侧壁6的高度;所述第一侧壁101上设置有连接部8,所述避让侧壁7与所述连接部8相对应以避让所述连接部8。
也就是说,在壳体1的第一侧壁101上会设置有如注液孔和电极组件等连接部8,而由于设置连接部8的原因,设置连接部8的第一侧壁101与第二侧壁201连接的高度减小,即H1减小,此时,将与连接部8相对应的第二侧壁201上的避让侧壁7的高度减小,能够避免避让侧壁7与连接部8相干涉。
其中,当电池外壳的整体高度小于或者等于8.5mm时,H1小于等于1.5mm,另外,当电池整体的高度增大时,H1也可以增大。
在一个实施例中,所述支架3设置的数量为一个且所述支架3为环形 支架3。
在该具体的例子中,支架3是一个整体的、呈环形的结构,这样结构的支架3可以为盖体2提供更加精准的定位、降低装配难度,同时可以在盖体2与壳体1通过激光焊接时避免激光焊接漏光而烫伤该电池外壳内设置的极芯。并且整体结构的支架3还可以起到加强筋的作用,抵消焊接产生的热变形。整体结构的支架3比较适用于尺寸较大的电池,因为电池尺寸较大时壳体1会有拉伸扭曲变形的情况,整体结构的支架3可以起到抵抗拉伸形变的作用。
在一个实施例中,所述支架3的数量为至少两个,且至少两个所述支架3均匀分布。
在该具体的例子中,支架3呈现出离散分布的结构,即支架3不是一个整体的环状结构,支架3的尺寸较小,多个支架3之间均匀间隔分布。这样结构的支架3比较适用于尺寸较小的电池,因为电池的尺寸较小时,壳体1不会出现拉伸扭曲变形的情况,选择离散分布且尺寸较小的支架3加工比较便利且材料使用较少,有利于降低成本。
在一个实施例中,所述第一侧壁101的数量为4个,所述支架3的数量为四个;每两个相邻第一侧壁101之间交界的位置处均设置有一个所述支架3。
如图3所示,每个支架3均与相邻的两个第一侧壁101连接,在支撑所述第二侧壁201的同时,能够提高所述壳体1的强度。
在一个实施例中,所述支架3为金属材质,所述支架3与所述第一侧壁101焊接连接或者粘接连接,其中,焊接连接可以达到更加牢固可靠的连接效果。
或者,所述支架3为非金属材质,所述支架3注塑设置在所述第一侧壁101上;或者所述支架3与所述第一侧壁101粘接连接。
根据本公开的第二方面,提供了一种电池。所述电池包括以上所述的电池外壳,还包括极芯,所述极芯包括极芯本体和极耳;所述壳体1和所述盖体2围合形成密封空间,所述极芯设置在所述密封空间内;所述极耳的一端设置在所述第一侧壁101上,且所述极耳的另一端与所述极芯本体 电连接。在本申请中,所述极耳包括第一极耳和第二极耳。所述极耳的一端设置在所述第一侧壁101上,是指第一极耳一端直接与所述第一侧壁101连接,所述第二极耳通过第一侧壁101上的连接部8与极柱连接。本公开实施例的电池具有较佳的密封性能,且能够具有较高的能量密度。
根据本公开的第三方面,提供了一种电子设备。所述电子设备包括以上所述的电池。本公开实施例的电子设备上的电池具有较佳的密封性能,且具有较高的能量密度,使电子设备具有较长的使用寿命。
上文实施例中重点描述的是各个实施例之间的不同,各个实施例之间不同的优化特征只要不矛盾,均可以组合形成更优的实施例,考虑到行文简洁,在此则不再赘述。
虽然已经通过示例对本公开的一些特定实施例进行了详细说明,但是本领域的技术人员应该理解,以上示例仅是为了进行说明,而不是为了限制本公开的范围。本领域的技术人员应该理解,可在不脱离本公开的范围和精神的情况下,对以上实施例进行修改。本公开的范围由所附权利要求来限定。

Claims (11)

  1. 一种电池外壳,包括:
    壳体(1),所述壳体(1)具有第一侧壁(101)和底壁(102),所述第一侧壁(101)与所述底壁(102)连接;
    支架(3),所述支架(3)连接在所述第一侧壁(101)的内侧;
    盖体(2),所述盖体(2)具有第二侧壁(201)和顶壁(202),所述第二侧壁(201)与所述顶壁(202)连接,所述第二侧壁(201)的端部与所述支架(3)抵接,并且所述第二侧壁(201)朝向所述第一侧壁(101)的一面与所述第一侧壁(101)朝向所述第二侧壁(201)的一面密封连接,以使所述壳体(1)和所述盖体(2)围设形成密封空间。
  2. 根据权利要求1所述的电池外壳,其中,沿所述顶壁(202)至所述第二侧壁(201)的端部的方向,所述第二侧壁(201)的高度为H1;所述支架(3)具有与所述第二侧壁(201)抵接的第一端面,所述第一端面至所述第一侧壁(101)远离所述底壁(102)的端部的距离为H2,其中,H2大于或者等于0.1mm,且H2小于或者等于H1。
  3. 根据权利要求1或2所述的电池外壳,其中,所述第二侧壁(201)的厚度为T1,所述支架(3)的厚度为T2,其中,T2大于或者等于T1;
    和/或,
    所述支架(3)的厚度为T2,所述第一侧壁(101)和所述底壁(102)之间通过第一倒角部(4)连接,所述第一倒角部(4)的半径为R1,其中,T2小于或者等于R1。
  4. 根据权利要求1-3任一项所述的电池外壳,其中,所述第二侧壁(201)和所述顶壁(202)之间通过第二倒角部(5)连接,所述第二倒角部(5)的半径为R2,所述第二侧壁(201)的厚度为T1;所述第一侧壁(101)和 所述底壁(102)之间通过第一倒角部(4)连接,所述第一倒角部(4)的半径为R1;其中,R2与T1之和小于或者等于R1。
  5. 根据权利要求1-4任一项所述的电池外壳,其中,T1大于0,且T1小于或者等于100μm;T2大于或者等于30μm,且T2小于或者等于120μm。
  6. 根据权利要求1-5任一项所述的电池外壳,其中,所述第二侧壁(201)包括安装侧壁(6)和避让侧壁(7),所述避让侧壁(7)的高度小于所述安装侧壁(6)的高度;
    所述第一侧壁(101)上设置有连接部(8),所述避让侧壁(7)与所述连接部(8)相对应以避让所述连接部(8)。
  7. 根据权利要求1-6任一项所述的电池外壳,其中,所述支架(3)的数量为至少两个,且至少两个所述支架(3)均匀分布。
  8. 根据权利要求1-7任一项所述的电池外壳,其中,所述第一侧壁(101)的数量为4个,所述支架(3)的数量为四个;每两个相邻第一侧壁(101)之间交界的位置处均设置有一个所述支架(3)。
  9. 根据权利要求1-8任一项所述的电池外壳,其中,所述支架(3)为金属材质,所述支架(3)与所述第一侧壁(101)焊接连接或者粘接连接;
    或者,
    所述支架(3)为非金属材质,所述支架(3)注塑设置在所述第一侧壁(101)上;或者所述支架(3)与所述第一侧壁(101)粘接连接。
  10. 一种电池,其中,所述电池包括如权利要求1-9中任一项所述的电池外壳,还包括极芯,所述极芯包括极芯本体和极耳;所述壳体(1)和所述盖体(2)围合形成密封空间,所述极芯设置在所述密封空间内;所述极 耳的一端设置在所述第一侧壁(101)上,且所述极耳的另一端与所述极芯本体电连接。
  11. 一种电子设备,其中,所述电子设备包括如权利要求10所述的电池。
PCT/CN2023/088143 2022-04-20 2023-04-13 一种电池外壳、电池及电子设备 WO2023202466A1 (zh)

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