WO2023050191A1

WO2023050191A1 - Battery case, battery, and electrical device

Info

Publication number: WO2023050191A1
Application number: PCT/CN2021/121816
Authority: WO
Inventors: 江斌; 林礼清
Original assignee: 宁德新能源科技有限公司
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2023-04-06
Also published as: CN115152082A

Abstract

The present application relates to the technical field of energy storage, and provides a battery case, a battery, and an electrical device. The battery case comprises a case body and a top cover covering an opening of the case body; a battery cell is placed in the case body; a reinforcing piece is provided on the bottom wall of the case body; the end of the reinforcing piece facing away from the bottom wall of the case body is connected to the top cover. In the present application, a reinforcing piece is provided in the case body, one end of the reinforcing piece is connected to one of the bottom wall of the case body and the top cover, and the other end of the reinforcing piece passes through the battery cell to be connected to the other one of the bottom wall of the case body and the top cover; in this way, when the battery case is impacted by gas released by the battery cell located in the battery case, the reinforcing piece located between the bottom wall of the case body and the top cover can apply an opposing force to the bottom wall of the case body and the top cover, to prevent the case body from deforming, thereby improving the strength of the case body, and improving the safety of the battery.

Description

Battery case, battery and electrical device

technical field

The present application relates to the technical field of energy storage, and in particular to a battery case, a battery and an electrical device.

Background technique

A battery is a device that converts chemical energy into electrical energy. It is widely used in new energy vehicles, energy storage power stations and other fields. A battery usually includes a battery case and a battery cell inside the battery case. The battery cell is charged and discharged. , will release a large amount of heat and gas. If the gas cannot be discharged from the battery case in time, it will impact the battery case, cause the battery case to expand and deform, and reduce the safety performance of the battery.

Contents of the invention

In view of the above problems, embodiments of the present application provide a battery case, a battery, and an electrical device, which are used to improve the strength of the battery case, thereby improving the safety performance of the battery.

In order to achieve the above purpose, the embodiment of the present application provides the following technical solutions:

The first aspect of the embodiment of the present application provides a battery case, including a case and a top cover covering the opening of the case, the case is used to place the battery cell, and the case is provided with a reinforcing member, One end of the reinforcing member is connected to one of the bottom wall of the housing and the top cover, and the other end of the reinforcing member passes through the battery core and is connected to the bottom wall of the housing and the top cover. Another connection in the top cover.

In this embodiment, the reinforcing member located between the bottom wall and the top cover of the shell can apply a facing force to the bottom wall and the top cover of the shell to prevent the shell from deforming, so as to improve the strength of the shell, and further Improve battery safety performance.

In some embodiments, one end of the reinforcing member is disposed at a central area of the bottom wall of the housing.

In some embodiments, the number of the reinforcing member is at least one.

In some embodiments, there is one reinforcing member, and it is arranged at the center of the bottom wall of the housing.

In some embodiments, one reinforcing member is arranged at the center of the bottom wall of the housing, and the rest of the reinforcing members are arranged at intervals along a first circular track, and the center of the first circular track is connected to the center of the housing. The centers of the bottom walls coincide.

In some embodiments, several of the reinforcement members are arranged at intervals along the second circular track, and the center of the second circular track coincides with the center of the bottom wall of the housing;

Several of the reinforcing members are arranged at intervals along the third circular track, the center of the third circular track coincides with the center of the second circular track, and the diameter of the third circular track is larger than that of the second circular track diameter.

In some embodiments, taking a plane parallel to the bottom wall of the casing as a cross-section, the reinforcement member has a polygonal cross-sectional shape.

In some embodiments, the stiffener has a circular cross-sectional shape.

In some embodiments, the stiffener has a diameter of 0.5 mm to 3 mm.

In some embodiments, the reinforcing member is made of stainless steel or aluminum.

In some embodiments, an insulating layer is provided on the outer surface of the reinforcing member.

A second aspect of the embodiments of the present application provides a battery, including a battery cell and the battery case in the above embodiment, and the battery cell is disposed in the battery case.

In some embodiments, the electric core is provided with a through hole corresponding to the reinforcing member, and the through hole facilitates the passing of the reinforcing member.

In some embodiments, one end of the reinforcing member is fixedly connected to the bottom wall of the housing, and the other end of the reinforcing member passes through the through hole and is fixedly connected to the top cover.

In some embodiments, one end of the reinforcing member is welded on the bottom wall of the casing, and the other end of the reinforcing member passes through the through hole and is welded on the top cover.

A third aspect of the embodiments of the present application provides an electrical device, including the battery in the above embodiments.

In a battery case, a battery, and an electrical device provided in an embodiment of the present application, by providing a reinforcing member in the housing, one end of the reinforcing member is connected to one of the bottom wall and the top cover of the housing, and the other end of the reinforcing member Passes through the cell and connects to the other of the bottom wall and top cover of the case, so that the battery case is located between the bottom wall and the top cover of the case when impacted by the gas released by the cells located in the battery case The reinforcing member can apply opposing force to the bottom wall and the top cover of the casing to prevent deformation of the casing, so as to improve the strength of the casing, thereby improving the safety performance of the battery.

Description of drawings

FIG. 1 is a perspective view of a battery case provided in an embodiment of the present application;

Figure 2 is an exploded view of the battery case provided by the embodiment of the present application;

Fig. 3 is a layout diagram 1 of the reinforcing member provided by the embodiment of the present application;

Figure 4 is the second layout of the reinforcement provided by the embodiment of the present application;

Figure 5 is the third layout diagram of the reinforcement provided by the embodiment of the present application;

FIG. 6 is a perspective view of a battery provided in an embodiment of the present application;

Figure 7 is an exploded view of the battery provided in the embodiment of the present application;

Fig. 8 is a top view of the battery provided by the embodiment of the present application;

Fig. 9 is a sectional view along the direction A-A in Fig. 8

FIG. 10 is an enlarged schematic diagram of area B in FIG. 9 .

Wherein, the reference signs are explained as follows:

100: battery;

10: Battery case:

11: shell;

111: bottom wall;

112: side wall;

113: pole structure;

114: liquid injection port;

115: liquid injection plug;

12: top cover;

13: reinforcement;

14: The first circular trajectory;

15: The second circular trajectory;

16: The third circular trajectory;

20: cell;

21: through hole;

22: sub-cell;

221: the first pole piece;

222: the second pole piece;

223: isolation film;

23: reinforcement plate;

24: Extreme ears.

Detailed ways

As described in the background technology, in the related art, there is a problem of thermal expansion and deformation of the battery case. The inventors have found that the reason for this problem is that the battery case is usually made of thinner aluminum material, resulting in the strength of the battery case. Low, when the battery cells in the battery case are charged or discharged, a lot of heat and gas will be generated, which will impact the battery case, causing deformation of the battery case and reducing the safety performance of the battery.

In order to solve the above-mentioned technical problems, the embodiment of the present application provides a battery case, a battery and an electrical device. By providing a reinforcing member in the housing, one end of the reinforcing member is connected to one of the bottom wall and the top cover of the housing. , the other end of the reinforcing member passes through the cell and is connected with the other of the bottom wall and the top cover of the case, so that when the battery case is impacted by the gas released by the cell located in the battery case, it is located at the bottom of the case The reinforcing member between the wall and the top cover can exert opposing forces on the bottom wall and the top cover of the casing to prevent deformation of the casing, so as to improve the strength of the casing and further improve the safety performance of the battery.

In order to make the above objects, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.

The embodiment of the present application provides an electric device, which may include a battery 100, and the battery 100 is used to provide electric energy to the electric device. The electric device in the embodiment of the present application may be a vehicle, for example: the vehicle may be a fuel Automobiles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.

In addition, the electrical device can also be other energy storage devices, such as mobile phones, portable devices, notebook computers, electric toys, electric tools, ships and spacecraft, etc., wherein the spacecraft can include airplanes, rockets, space shuttles or spaceships .

The batteries described in the embodiments of the present invention are not limited to be applicable to the above-described power-consuming devices, but for the sake of brevity, the following embodiments are described by taking a mobile phone as an example.

Exemplarily, a mobile phone may include a main body of the mobile phone and a battery disposed in the main body of the mobile phone, wherein the battery is electrically connected to the circuit board of the main body of the mobile phone to provide power for the circuit board to ensure the normal use of the mobile phone.

The battery 100 may include a battery case 10 and a battery cell 20 disposed in the battery case 10, wherein the battery cell 20 is provided with a through hole 21 along its thickness direction, and the through hole 21 facilitates the penetration of the reinforcing member 13 located in the battery case 10. set up.

As shown in Figures 1 and 2, the battery case 10 includes a case 11 and a top cover 12 covering the opening of the case 11, the case 11 is used to place the battery cell 20, wherein the case 11 can be an integral structure , can also be a split structure, and when the shell 11 has an integrated structure, the manufacturing process of the shell 11 can be simplified and the difficulty of assembly can be reduced.

Continuing to refer to FIG. 2, when the housing 11 is a split structure, the housing 11 may include a bottom wall 111 and a side wall 112 disposed on the bottom wall 111, wherein the side wall 112 may be fixed by welding or bonding Connected to the bottom wall 111, this embodiment sets the housing 11 as a split structure, so that the area enclosed between the side wall 112 and the bottom wall 111 can be actually adjusted according to the size of the battery cell 20, thereby improving the housing 11 application flexibility.

It should be understood that, in this embodiment, the side wall 112 may be an integral ring structure, or may be a split structure, which is not specifically limited in this embodiment.

There is a reinforcement 13 inside the housing 11 , one end of the reinforcement 13 is connected to one of the bottom wall 111 of the housing 11 and the top cover 12 , and the other end of the reinforcement 13 passes through the through hole 21 of the cell 20 and connects to the housing The bottom wall 111 of 11 is connected to the other of the top cover 12. For example, taking the orientation shown in FIG. After passing through the through hole 21 of the cell 20 from bottom to top, it is connected to the top cover 12; for another example, after one end of the reinforcement member 13 is connected to the top cover 12, the other end of the reinforcement member 13 passes through the cell from top to bottom. The through hole 21 of 20 is then connected to the bottom wall of the housing 11 .

It should be noted that the through hole 21 of the battery cell 20 can also facilitate the electrolytic solution to infiltrate the electrode piece of the battery cell 20 , thereby improving the performance of the battery 100 .

Wherein, the position and number of the through holes 21 are respectively matched with the position and number of the reinforcing member 13, for example, when the number of the reinforcing member 13 is one, and the reinforcing member 13 is arranged on the bottom wall of the housing 11 111 at the center, the through hole 21 needs to be set at the center of the cell 20 .

In this embodiment, by providing a reinforcing member 13 in the housing 11, one end of the reinforcing member 13 is connected to one of the bottom wall 111 of the housing 11 and the top cover 12, and the other end of the reinforcing member 13 passes through the battery core 20 Afterwards, it is connected with the other one of the bottom wall 111 and the top cover 12 of the housing 11, so that when the battery case 10 is impacted by the gas released from the battery cell 20 in the battery case 10, the bottom wall 111 and the top cover of the housing 11 The reinforcement 13 between the covers 12 can exert opposing force on the bottom wall 111 of the casing 11 and the top cover 12 to prevent the casing 11 from being deformed, so as to improve the strength of the casing 11 and further improve the safety performance of the battery 100 .

In some embodiments, one end of the reinforcing member 13 is fixedly connected to the bottom wall 111 of the casing 11, and the other end of the reinforcing member 13 is fixedly connected to the top cover 12 after passing through the through hole 21, that is, one end of the reinforcing member 13 can be first It is fixedly connected to the bottom wall 111 of the housing 11, and then the battery cell 20 is placed in the housing 11, and the other end of the reinforcing member 13 is fixedly connected to the top cover 12 after passing through the through hole 21 of the battery core 20, for example, One end of the reinforcing member 13 can be fixedly connected to the bottom wall 111 of the casing 11 by welding, and the other end of the reinforcing member 13 can be fixedly connected to the top cover 12 by welding after passing through the through hole 21 of the battery cell 20, and The edge of the top cover 12 is fixedly connected with the top edge of the casing 11 to realize the assembly of the battery cell 20 and the battery casing 10 .

When the other end of the reinforcing member 13 is fixedly connected with the top cover 12 by welding, an accommodation hole can be formed in the area of the top cover 12 and the reinforcing member 13, so that the other end of the reinforcing member 13 is located behind the receiving hole. Way to weld the reinforcement 13 in the receiving hole.

The reinforcing member 13 can also be fixedly connected with the bottom wall 111 and the top cover 12 of the housing 11 through other connection methods, for example, one end of the reinforcing member 13 can be bonded to the bottom wall 111 of the housing 11, and the other end of the reinforcing member 13 One end passes through the cell 20 and is welded on the top cover 12. For another example, one end of the reinforcing member 13 can be welded to the bottom wall 111 of the casing 11, and the other end of the reinforcing member 13 can pass through the cell 20 and then bonded to the top cover 12. On the top cover 12 , for another example, two ends of the reinforcing member 13 are bonded to the bottom wall 111 and the top cover 12 respectively.

In this embodiment, by fixing the two ends of the reinforcing member 13 on the bottom wall 111 and the top cover 12 of the housing 11, the connection strength between the reinforcing member 13 and the housing 11 can be increased, and the deformation of the housing 11 can be prevented. , improve the strength of the casing 11 , and further improve the safety performance of the battery 100 .

In some embodiments, the reinforcing member 13 can be disposed at the central area of the bottom wall 111 of the casing 11. In view of the large amount of heat or gas generated by the battery cell 20 at the central position of the battery case 10, the heat or gas is not easy to Released to the outside of the battery case 10, the area where the battery case 10 is likely to deform is mainly located at the center. Therefore, in this embodiment, the reinforcing member 13 is arranged at the central area of the bottom wall 111, which can increase the deformation of the case 11. The strength of the area can also ensure the volumetric energy density of the battery 100 .

In this embodiment, the volumetric energy density of the battery refers to: for a given electrochemical energy storage device, the volume ratio of the charged energy to the energy storage medium. If the volume of the battery becomes larger, the volume energy density of the battery will be reduced, and the energy of the battery will be reduced.

It should be noted that when the battery cell 20 includes a plurality of sub-cells 22 , at this time, the central area can be understood as an area with a certain radius centered on the middlemost sub-cell 22 . When the cell is a stacked cell, the central area can be understood as the center of the stacked cell as the origin, and a certain radius area. If the distance between the center of the cell and the edge of the cell is H, a certain radius can be understood as 1/3-1/2H.

There is at least one reinforcing member 13 , for example, as shown in FIG. 3 , there may be one reinforcing member 13 , and the reinforcing member 13 is arranged at the center of the bottom wall 111 of the casing 11 . For another example, the number of reinforcing pieces 13 can also be multiple, and the arrangement of multiple reinforcing pieces 13 can be described through the following two implementations. It should be noted that the following two implementations are only Two possible ways are given as examples, rather than limiting the arrangement of the reinforcing member.

As a feasible embodiment of the reinforcement, one of the reinforcements 13 is arranged at the center of the bottom wall 111 of the housing 11, and the rest of the reinforcements 13 are arranged at intervals along the first circular track 14, and the center of the first circular track 14 It coincides with the center of the bottom wall 111 of the casing 11 .

Exemplarily, as shown in FIG. 4 , the number of reinforcements 13 is five, one reinforcement 13 is arranged at the center of the bottom wall 111 of the housing 11 , and the remaining four reinforcements 13 are spaced apart along the first circular track 14 set up.

Wherein, the first circular trajectory 14 may be a circular trajectory or a rectangular trajectory, which is not specifically limited in this embodiment.

In this embodiment, by distributing several reinforcing members 13 in a ring shape, the strength of the casing 11 can be increased to the greatest extent, preventing the casing 11 from being bulged and deformed, thereby improving the safety performance of the battery 100 .

As another possible embodiment of the reinforcement, several reinforcements 13 are arranged at intervals along the second circular track 15 , and the center of the second circular track 15 coincides with the center of the bottom wall 111 of the casing 11 .

Several reinforcing pieces 13 are arranged at intervals along the third circular track 16 , the center of the third circular track 16 coincides with the center of the second circular track 15 , and the diameter of the third circular track 16 is larger than that of the second circular track 15 .

Exemplarily, as shown in FIG. 5 , the number of reinforcements 13 is eight, four reinforcements 13 are arranged at intervals along the second annular track 15, and four reinforcements 13 are arranged at intervals along the third annular track 16, so that more Each reinforcing member 13 presents two annular configurations.

In this embodiment, by distributing a plurality of reinforcing members 13 on circular tracks with different diameters, the strength of the casing 11 can be fully increased, and the expansion and deformation of the casing 11 can be avoided, thereby improving the safety performance and reliability of the battery 100 .

It should be noted that the number of reinforcing pieces 13 distributed along the second circular track 15 may be different from the number of reinforcing pieces 13 distributed along the third circular track 16, for example, the reinforcing pieces on the second circular track 15 The number of 13 may be three, and the number of reinforcements 13 on the third circular track 16 may be five.

In addition, the distances between adjacent reinforcing pieces 13 on the same circular track may be equal or unequal, which is not specifically limited in this embodiment.

In some embodiments, taking a plane parallel to the bottom wall 111 of the casing 11 as a cross-section, the cross-sectional shape of the reinforcing member 13 is polygonal or circular, for example, the cross-sectional shape of the reinforcing member 13 is rectangular or circular.

In this embodiment, by making the cross-sectional shape of the reinforcing member 13 a regular shape, the preparation of the reinforcing member can be facilitated and the production cost can be reduced.

In addition, the reinforcing member 13 can also have an irregular shape, which can be designed according to actual needs.

It should be noted that the reinforcing member 13 can be configured as a separate body from the bottom wall 111 of the housing 11 as described in the above embodiments, or can be a protrusion integrally formed directly with the housing 11 .

In some embodiments, the material of the reinforcing member 13 may include aluminum or stainless steel. Compared with iron, the weight of the reinforcing member 13 can be reduced, thereby increasing the mass energy density of the battery and improving the performance of the battery.

In some embodiments, if the diameter of the reinforcing member 13 is less than 0.5 mm, on the one hand, it will increase the difficulty of preparing the reinforcing member 13, and on the other hand, it will reduce the strength of the reinforcing member 13. During use, the reinforcing member is prone to deformation and difficult to Play a supporting function; if the diameter of the reinforcing member 13 is greater than 3mm, the quality and volume of the reinforcing member 13 will be increased, and the energy density of the battery will be reduced. Therefore, in this embodiment, the diameter of the reinforcing member 13 is set between 0.5mm and 3mm During this time, the strength of the casing 11 can be increased, and the energy density of the battery can also be avoided from being reduced.

In some embodiments, as shown in FIG. 6 , a pole structure 113 can also be provided on the side wall 112 of the housing 11 , and the pole structure 113 is used to connect with the tabs of the battery cell 20 to transfer the electric energy of the battery cell 20 transmitted to the electrical device.

Further, as shown in FIG. 7, a liquid injection port 114 and a liquid injection plug 115 detachably connected to the liquid injection port 114 are also provided on the side wall 112 of the housing 11, so that the liquid can be injected into the housing through the liquid injection port 114. Electrolyte is injected to realize the function of the battery.

The liquid injection plug 115 is used to block the liquid injection port 114 to prevent the electrolyte in the housing 11 from leaking out of the housing 11 and ensure the safety and service life of the battery 100 .

Wherein, the liquid injection plug 115 can be connected to the liquid injection port 114 by thread, or can be connected to the liquid injection port 114 by snap-fitting.

In some embodiments, since the reinforcing member 13 needs to pass through the electric core 20, an insulating layer is provided on the outer surface of the reinforcing member 13, and the insulating layer may be an insulating coating coated on the outer surface of the reinforcing member 13 Alternatively, the protective glue can protect the reinforcing member 13 by setting the insulating coating and the protective layer, prevent the electrolyte from corroding the reinforcing member 13, and improve the service life of the reinforcing member 13 .

In some embodiments, as shown in FIG. 9 and FIG. 10 , the cell 20 may include a laminated structure, for example, the cell 20 may include a plurality of sub-cells 22 stacked, wherein each sub-cell 22 is It includes a first pole piece 221 , an isolation film 223 and a second pole piece 222 which are stacked.

The isolation film 223 is arranged between the adjacent first pole piece 221 and the second pole piece 222, and is used to realize the insulation setting between the first pole piece 221 and the second pole piece 222, wherein, the material of the isolation film 223 can be For PP or PE etc.

It should be noted that in this embodiment, the polarity of the first pole piece 221 and the second pole piece 222 are opposite, and the first pole piece 221 can be an anode pole piece or a cathode pole piece. For the convenience of description, the following implementation The examples are all described by taking the first pole piece as an anode pole piece, the second pole piece as a cathode pole piece, and the battery as a lithium battery as examples.

The first pole piece 221 includes a first current collector and a first diaphragm, wherein the number of the first diaphragm is two, and the two first diaphragms are respectively arranged on the upper surface and the lower surface of the first current collector, In addition, the material of the first current collector may be aluminum, and the material of the first diaphragm may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide.

The second pole piece 222 includes a second current collector and a second diaphragm, wherein the number of the second diaphragm can be two, and the two second diaphragms can be respectively arranged on the upper surface and the lower surface of the second current collector , wherein the material of the second current collector is copper, and the material of the second membrane includes carbon or silicon.

Continuing to refer to FIG. 7 , the battery cell 20 also includes a tab 24, one end of the tab 24 is used to connect with the current collectors of the first pole piece 221 and the second pole piece 222, and the other end of the tab 24 is used to connect with the pole structure 113, so as to realize the charging and discharging function of the battery cell.

In some embodiments, as shown in FIG. 9 , a reinforcement plate 23 is also provided on the battery cell 20 , and one end of the reinforcement plate 23 is flush with the upper top surface of the battery cell 20 along a direction perpendicular to the bottom wall 111 of the housing 11 , the other end of the reinforcing plate 23 is flush with the lower bottom surface of the battery core 20 .

In this embodiment, the reinforcement plate 23 is used to support the side of the battery cell 20 to improve the strength of the battery cell 20 .

Each embodiment or implementation manner in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. mean that the embodiments are combined A specific feature, structure, material, or characteristic described or exemplified is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims

A battery case, characterized in that it includes a case and a top cover covering the opening of the case, and the case is used to place batteries;

A reinforcing member is provided inside the housing, one end of the reinforcing member is connected to one of the bottom wall of the housing and the top cover, and the other end of the reinforcing member passes through the battery core and is connected to the The bottom wall of the housing is connected to the other of the top covers.
The battery case according to claim 1, wherein one end of the reinforcing member is disposed at a central area of the bottom wall of the case.
The battery case according to claim 1, characterized in that there are multiple reinforcement members.
The battery case according to claim 1, wherein there is one reinforcing member, and it is arranged at the center of the bottom wall of the case.
The battery case according to claim 3, wherein one of the reinforcing members is arranged at the center of the bottom wall of the housing, and the rest of the reinforcing members are arranged at intervals along a first annular track, and the first annular The center of the track coincides with the center of the bottom wall of the housing.
The battery case according to claim 3, wherein several of the reinforcing members are arranged at intervals along the second circular track, and the center of the second circular track coincides with the center of the bottom wall of the casing;

Several reinforcement members are arranged at intervals along the third circular track, the center of the third circular track coincides with the center of the second circular track, and the diameter of the third circular track is larger than that of the second circular track diameter.
The battery case according to any one of claims 1-6, wherein, taking a plane parallel to the bottom wall of the case as a cross-section, the cross-sectional shape of the reinforcing member is a polygon, or, the The cross-sectional shape of the stiffener is annular.
The battery case according to claim 7, wherein the reinforcement member has a diameter of 0.5 mm to 3 mm;

The material of the reinforcing member includes stainless steel or aluminum.
The battery case according to any one of claims 1-6, wherein an insulating layer is provided on an outer surface of the reinforcing member.
A battery, characterized in that it comprises a battery cell and the battery case according to any one of claims 1-9, the battery cell is arranged in the battery case;

The electric core is provided with a through hole corresponding to the reinforcing member along its thickness direction, and the through hole is convenient for the reinforcing member to pass through.
The battery according to claim 10, wherein one end of the reinforcing member is fixedly connected to the bottom wall of the casing, and the other end of the reinforcing member passes through the through hole and is fixed to the top cover connect.
The battery according to claim 11, wherein one end of the reinforcing member is welded on the bottom wall of the casing, and the other end of the reinforcing member is welded on the top cover.
An electric device, characterized by comprising the battery according to claim 12.