Battery casing and battery

Abstract

This utility model relates to a battery casing and a battery. The battery casing includes a housing and terminals. The housing includes a main body portion, within which a main receiving cavity is formed. Two protrusions extending outward toward the main receiving cavity are formed on one side of the main body portion, and secondary receiving cavities communicating with the main receiving cavity are formed within the protrusions. At least one of the protrusions is provided with a terminal, which is mounted on one side of the protrusion along the thickness direction of the housing. This structure is beneficial for improving the utilization rate of the internal space of the housing by the electrode assembly, thereby improving the overall space utilization rate of the battery composed of the battery casing. Furthermore, by mounting the terminal on the large surface of the housing, the size of the terminal is not limited by the thickness of the housing. For thinner housings, the terminal can also be designed with appropriate dimensions to meet the welding requirements between the terminal and the tab, ensuring sufficient welding area between the terminal and the tab and improving welding reliability.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery casing and a battery containing the battery casing. Background Technology

[0002] A battery generally consists of a casing and an electrode assembly housed within the casing. The electrode assembly is composed of several positive and negative electrodes and a separator, stacked in an alternating pattern. Terminals are mounted on the side walls of the casing to connect the electrode assembly to an external power source or device. Batteries can serve as power sources for electronic devices (mobile phones, tablets, instruments, etc.). In electronic device applications, batteries are generally characterized by their small size, thinness, and compact structure.

[0003] In related technologies, the outer casing is generally square, and the internal cavity for mounting the electrode assembly is also square. (Refer to...) Figure 1 As shown, the electrode assembly includes a current collector 1' and a tab 2' located at one end of the current collector 1', which is electrically connected to a terminal post on the casing. However, the presence of the tab 2' results in a large gap between the side of the current collector 1' corresponding to the tab 2' and the inner wall of the casing, leading to low space utilization within the casing. Furthermore, with the trend towards thinner and lighter electronic devices, the overall thickness of the battery is also decreasing. Since the terminal post is mounted on the side of the casing in the thickness direction, as the casing thickness decreases, the size of the terminal post also decreases accordingly, making welding between the tab 2' and the terminal post difficult. Alternatively, the small welding area between the terminal post and the tab 2' can lead to breakage. Utility Model Content

[0004] The purpose of this invention is to provide a battery casing and a battery that have high space utilization, facilitate welding of the terminals and tabs, and have high welding reliability.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery casing is provided, comprising:

[0007] A housing, the housing including a main body portion, a main receiving cavity formed therein, two protrusions extending outward toward the main receiving cavity on one side of the main body portion, and a secondary receiving cavity communicating with the main receiving cavity formed within the protrusions;

[0008] The pole is provided on at least one of the protrusions, and the pole is mounted on one side of the protrusion along the thickness direction of the housing.

[0009] Furthermore, the two protrusions are spaced apart along a first direction, and the lengths of the two protrusions in the first direction are L1 and L2, respectively, and L1≠L2.

[0010] Furthermore, the two protrusions are located at opposite ends of the main body along the first direction.

[0011] Furthermore, the electrode post is a positive electrode post, which is disposed on one of the protrusions, and the other protrusion and the main body together form the negative electrode of the battery.

[0012] Furthermore, there are two poles, namely a positive pole and a negative pole, which are respectively disposed on the two protrusions.

[0013] Furthermore, it also includes an insulating element sandwiched between the pole and the protrusion.

[0014] Furthermore, the height of the protrusion relative to the main body is H, where H = 3.0 mm to 6.0 mm.

[0015] Furthermore, the thickness of the shell is T, where T = 1.0 mm to 5.0 mm.

[0016] Furthermore, the housing includes a frame and a cover plate. The frame includes a first frame and a second frame protruding from the first frame. The first frame forms the main receiving cavity, and the first frame forms a first opening communicating with the main receiving cavity on one side along the thickness direction of the housing. The second frame forms the secondary receiving cavity, and the second frame forms a second opening communicating with the secondary receiving cavity on one side along the thickness direction of the housing. The cover plate includes a first flat plate and a second flat plate protruding from the first flat plate. The first flat plate covers the first opening, and the second flat plate covers the second opening.

[0017] Furthermore, the housing includes a surrounding plate and two cover plates. The surrounding plate includes a first surrounding plate and a second surrounding plate protruding from the first surrounding plate. The first surrounding plate forms the main receiving cavity, and the first surrounding plate forms first openings communicating with the main receiving cavity on both sides along the thickness direction of the housing. The second surrounding plate forms the secondary receiving cavity, and the second surrounding plate forms second openings communicating with the secondary receiving cavity on both sides along the thickness direction of the housing. The cover plates include a first flat plate and a second flat plate protruding from the first flat plate. The two first flat plates respectively cover the two first openings, and the two second flat plates respectively cover the two second openings.

[0018] A battery is also provided, including an electrode assembly and a battery casing. The electrode assembly includes an electrode body and a positive electrode tab and a negative electrode tab disposed on the electrode body. The electrode body is housed in a main receiving cavity, and the positive electrode tab and the negative electrode tab are respectively housed in two secondary receiving cavities.

[0019] Furthermore, it also includes a protective plate, which is inserted between the two protrusions.

[0020] The advantages of this utility model compared to the prior art are:

[0021] This utility model discloses a battery casing and a battery. By providing two protrusions on one side of the main body, the entire casing adopts a U-shaped structure. The overall shape of the main and secondary receiving cavities inside the casing matches the shape of the electrode assembly; that is, the current collector in the electrode assembly is installed in the main receiving cavity, and the electrode tabs in the electrode assembly are installed in the secondary receiving cavity. This structure helps to improve the utilization rate of the internal space of the casing by the electrode assembly, thereby improving the overall space utilization rate of the battery composed of this casing. Furthermore, by mounting the terminals on the large surface of the casing, the size of the terminals is not limited by the thickness of the casing. For thinner casings, the terminals can also be designed with appropriate dimensions to meet the welding requirements between the terminals and the tabs, ensuring sufficient welding area between the terminals and the tabs and improving welding reliability. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of an electrode assembly in the prior art.

[0024] Figure 2 This is a schematic diagram of the battery casing according to an embodiment of the present invention.

[0025] Figure 3 This is an exploded view of the battery casing according to an embodiment of the present invention.

[0026] Figure 4 This is an exploded view of the battery casing according to another embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the pole of an embodiment of the present utility model.

[0028] Figure 6 This is a schematic diagram of the insulating component according to an embodiment of the present invention.

[0029] Figure 7 This is a schematic diagram of a battery according to an embodiment of the present invention.

[0030] Figure 1 middle:

[0031] 1′ Current collector; 2′ Electrode;

[0032] Figures 2 to 7 middle:

[0033] 1. Housing; 11. Main body; 110. Main receiving cavity; 12. Protrusion; 120. Secondary receiving cavity; 121. First protrusion; 122. Second protrusion; 123. Mounting hole; 13. Groove; 14. Enclosure; 141. First enclosure; 142. Second enclosure; 15. Cover plate; 151. First flat plate; 152. Second flat plate; 16. Frame; 161. First frame; 162. Second frame; 2. Pole post; 21. Connecting post; 22. Adapter plate; 3. Insulating component; 31. Outer insulating sheet; 32. Inner insulating sheet; 33. Through hole; 4. Protective plate. Detailed Implementation

[0034] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 2 and Figure 3 As shown, this utility model provides a battery casing, including a housing 1 and an electrode post 2. The housing 1 has a cavity structure, and its interior is used to accommodate an electrode assembly. The electrode post 2 is mounted on the housing 1 and electrically connected to the electrode assembly, allowing the electrode assembly to be connected to an external power source or electrical device via the electrode post 2. The housing 1 includes a main body 11 and a protrusion 12, which are integrally formed. A main receiving cavity 110 is formed inside the main body 11, which is used to accommodate current collectors in the electrode assembly. A protrusion 12 extending outward toward the main receiving cavity 110 is formed on one side of the main body 11. Alternatively, the protrusion 12 protrudes from one side of the main body 11, with the end of the protrusion 12 facing away from the main body 11 being a free end, extending in a direction away from the main receiving cavity 110. There are two protrusions 12, spaced apart on one side of the main body 11. A secondary receiving cavity 120 is formed within the protrusion 12, which communicates with the main receiving cavity 110. The secondary receiving cavity 120 is used to receive the tabs in the electrode assembly. At least one of the protrusions 12 is provided with an electrode post 2, which is mounted on one side of the protrusion 12 along the thickness direction (Y direction in the figure), that is, the protrusion 12 is located on the large surface of the housing 1.

[0036] It is understood that the housing 1 includes a main body 11 and two protrusions 12 disposed on one side of the main body 11, making the entire housing 1 have a U-shaped structure. The overall shape of the main receiving cavity 110 and the secondary receiving cavity 120 inside the housing 1 matches the shape of the electrode assembly, that is, the current collector in the electrode assembly is installed in the main receiving cavity 110, and the electrode tab in the electrode assembly is installed in the secondary receiving cavity 120. This structure is beneficial to improving the occupancy rate of the electrode assembly in the internal space of the housing 1, thereby improving the overall space utilization rate of the battery composed of the battery casing. In addition, by mounting the electrode post 2 on the large surface of the housing 1, the size of the electrode post 2 is not limited by the thickness of the housing 1. For a thinner housing 1, the electrode post 2 can also be designed with appropriate dimensions to meet the welding requirements between the electrode post 2 and the electrode tab, ensuring that there is a sufficient welding area between the electrode post 2 and the electrode tab, and improving welding reliability.

[0037] Specifically, there are two protrusions 12, which are spaced apart along a first direction (X direction in the figure) on one side of the main body 11. The two protrusions 12 are a first protrusion 121 and a second protrusion 122. The length of the first protrusion 121 in the first direction is L1, and the length of the second protrusion 122 in the first direction is L2, where L1 ≠ L2. In this embodiment, the length L1 of the first protrusion 121 is greater than the length L2 of the second protrusion 122. The two protrusions 12 correspond to the positive and negative electrodes of the battery. Because the lengths of the two protrusions 12 in the first direction are different, the two protrusions 12 are of different sizes, which serves as a foolproof mechanism, facilitating the identification of the two protrusions 12 during manufacturing and preventing incorrect assembly of the positive and negative electrode tabs in the electrode assembly.

[0038] Specifically, the battery casing includes a terminal post 2. Terminal post 2 is the positive terminal post, disposed on the first protrusion 121. The second protrusion 122 and the main body 11 together form the negative terminal of the battery. It is understood that the positive terminal post is mounted on the first protrusion 121, and insulation is required between the positive terminal post and the first protrusion 121. The positive terminal post is electrically connected to the positive tab in the electrode assembly. The negative tab in the electrode assembly is connected to the inner wall of the second protrusion 122, making the entire casing 1 the negative terminal of the battery. Since the first protrusion 121 is relatively large, mounting the positive terminal post on the first protrusion 121 provides sufficient installation space. Of course, if the size of the second protrusion 122 meets the installation requirements, the positive terminal post can also be mounted on the second protrusion 122, correspondingly connecting the negative tab in the electrode assembly to the inner wall of the first protrusion 121. In another alternative embodiment, the number of pole posts 2 can be set to two, with the two pole posts 2 respectively mounted on the two protrusions 12, and the two pole posts 2 respectively connected to the positive and negative tabs in the electrode assembly, so that the two pole posts 2 respectively form a positive pole post and a negative pole post.

[0039] Specifically, two protrusions 12 are located at opposite ends of the main body 11 along a first direction. The housing 1 has an overall cuboid structure, with the main body 11 being the main component of the housing 1. The length direction of the main body 11 is the Z direction shown in the figure, the width direction is the X direction shown in the figure, and the thickness direction is the Y direction shown in the figure. Two protrusions 12 are disposed at one end of the length direction of the main body 11, and the two protrusions 12 are spaced apart along the width direction (i.e., the first direction) of the main body 11. The two protrusions 12 are located at opposite ends of the main body 11 along its width direction. This structure forms a groove 13 between the two protrusions 12 and the main body 11, which can be used to accommodate other electronic devices. Of course, in some embodiments, the protrusions 12 can also be disposed at non-end positions on the main body 11 to accommodate the tab positions in the electrode assembly.

[0040] Specifically, the two protrusions 12 protrude from the main body 11 at the same height, meaning the distance between the free ends of the two protrusions 12 and the main body 11 is the same. The height of the protrusion 12 relative to the main body 11 is H, where H = 3.0 mm to 6.0 mm. The height H of the protrusion 12 is the straight-line distance from the side of the main body 11 facing the protrusion 12 to the free end of the protrusion 12. The height of the protrusion 12 is matched with the length of the tab in the electrode assembly. Furthermore, the height of the protrusion 12 is controlled between 3.0 mm and 6.0 mm to provide sufficient space on the protrusion 12 for mounting the electrode post 2. In this embodiment, the height dimension H of the protrusion 12 is within the range of, but is not limited to, 3.0mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.25mm, 4.5mm, 4.75mm, 5.0mm, 5.25mm, 5.5mm, 5.75mm and 6.0mm.

[0041] Specifically, the thickness of the shell 1 is T, where T = 1.0 mm to 5.0 mm. In this embodiment, the value range of the thickness T of the shell 1 includes, but is not limited to, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, and 5.0 mm.

[0042] Specifically, refer to Figure 3 , Figure 5 and Figure 6As shown, the battery casing also includes an insulating component 3, which is sandwiched between the terminal post 2 and the protrusion 12, so that the terminal post 2 and the entire casing 1 are insulated and isolated by the insulating component 3. In this embodiment, the first protrusion 121 is provided with the terminal post 2 and the insulating component 3, and the second protrusion 122 is directly used as the negative terminal of the battery. The terminal post 2 is installed on the first protrusion 121 by riveting. Correspondingly, the first protrusion 121 is provided with a mounting hole 123 on one side along the thickness direction of the casing 1. The secondary receiving cavity 120 in the first protrusion 121 communicates with the outside of the casing 1 through the mounting hole 123, and the mounting hole 123 is used to pass through the terminal post 2 and the insulating component 3. The terminal post 2 includes a connecting post 21 and an adapter plate 22 provided at both ends of the connecting post 21. The connecting post 21 has a cylindrical structure, and the adapter plate 22 has a circular plate structure. The entire terminal post 2 has an "I" shaped structure. Correspondingly, the insulating component 3 is also configured with an "I"-shaped structure. The insulating component 3 includes an outer insulating sheet 31 and an inner insulating sheet 32 ​​arranged in parallel and spaced apart. The outer insulating sheet 31 and the inner insulating sheet 32 ​​are connected and fixed by an insulating post. The insulating component 3 is provided with a through hole 33, which passes through the outer insulating sheet 31, the inner insulating sheet 32, and the insulating post. The insulating component 3 passes through the mounting hole 123 of the first protrusion 121, and the side wall of the first protrusion 121 is sandwiched between the outer insulating sheet 31 and the inner insulating sheet 32. The outer insulating sheet 31 abuts against the outer side surface of the first protrusion 121, and the inner insulating sheet 32 ​​abuts against the inner side surface of the first protrusion 121. The connecting post 21 passes through the through hole 33, and the two adapter plates 22 abut against the outer insulating sheet 31 and the inner insulating sheet 32, respectively. This structure allows the adapter plate 22 located outside the first protrusion 121 to be insulated from the first protrusion 121 by the outer insulating sheet 31, the adapter plate 22 located inside the first protrusion 121 to be insulated from the first protrusion 121 by the inner insulating sheet 32, and the connecting post 21 to be insulated from the first protrusion 121 by the insulating post, thereby achieving insulation isolation between the pole post 2 and the first protrusion 121 by the insulating member 3.

[0043] In another embodiment, the insulating member 3 is configured with a "T"-shaped structure, that is, the insulating member 3 includes an insulating post and an outer insulating sheet 31 disposed at one end of the insulating post, and a through hole 33 penetrates the outer insulating sheet 31 and the insulating post. In this embodiment, the first protrusion 121 is provided with the electrode post 2 and the insulating member 3, and the second protrusion 122 is directly used as the negative terminal of the battery. The electrode post 2 is installed on the first protrusion 121 by plugging and fixing. Correspondingly, the first protrusion 121 is provided with a mounting hole 123 on one side along the thickness direction of the housing 1, and the secondary receiving cavity 120 in the first protrusion 121 communicates with the outside of the housing 1 through the mounting hole 123. The mounting hole 123 is used to pass through the electrode post 2 and the insulating member 3. The electrode post 2 has a "T"-shaped structure and is installed on the first protrusion 121 by plugging and fixing. The electrode post 2 includes a connecting post 21 and an adapter plate 22 disposed at one end of the connecting post 21. The insulating post in the insulating component 3 passes through the mounting hole 123 of the first protrusion 121, and the outer insulating sheet 31 abuts against the outer surface of the first protrusion 121. The connecting post 21 passes through the through hole 33, and the adapter plate 22 abuts against the outer insulating sheet 31. This structure allows the adapter plate 22 to be insulated from the first protrusion 121 by the outer insulating sheet 31, and the connecting post 21 to be insulated from the first protrusion 121 by the insulating post, thereby achieving insulation isolation between the pole post 2 and the first protrusion 121 through the insulating component 3.

[0044] In an alternative embodiment, refer to Figure 3 As shown, the housing 1 includes a frame 16 and a cover plate 15. The frame 16 is used to accommodate the electrode assembly, and the cover plate 15 is placed on the frame 16 to close it. The frame 16 includes a first frame 161 and a second frame 162 protruding from the first frame 161. The first frame 161 corresponds to the main body 11, and a main receiving cavity 110 is formed within the first frame 161. Along the thickness direction of the housing 1, a first opening communicating with the main receiving cavity 110 is formed on one side of the first frame 161. The second frame 162 corresponds to the protrusion 12, and a secondary receiving cavity 120 is formed within the second frame 162. Along the thickness direction of the housing 1, a second opening communicating with the secondary receiving cavity 120 is formed on one side of the second frame 162. The first opening and the second opening communicate with each other. The cover plate 15 has a flat plate structure, and the shape of the cover plate 15 matches the overall shape of the first opening and the second opening. The cover plate 15 includes a first flat plate 151 and a second flat plate 152 protruding from the first flat plate 151. The first flat plate 151 and the second flat plate 152 are integral structures. The first flat plate 151 covers the first opening to form the main body 11, and the second flat plate 152 covers the second opening to form the protrusion 12. Correspondingly, the pole post 2 is mounted on the second flat plate 152. In this embodiment, the housing 1 can be disassembled into two parts for processing. That is, during the manufacturing process, the frame 16 and the cover plate 15 are processed separately, and then the cover plate 15 is welded to the frame 16 to form the housing 1.

[0045] In another alternative embodiment, refer to Figure 4 As shown, the housing 1 includes a surrounding plate 14 and two cover plates 15. The surrounding plate 14 is used to accommodate the electrode assembly, and the cover plates 15 are placed on the surrounding plate 14 to close it. The surrounding plate 14 includes a first surrounding plate 141 and a second surrounding plate 142 protruding from the first surrounding plate 141. The first surrounding plate 141 corresponds to the main body 11, and a main receiving cavity 110 is formed within the first surrounding plate 141. Along the thickness direction of the housing 1, two opposite sides of the first surrounding plate 141 form a first opening communicating with the main receiving cavity 110. The second surrounding plate 142 corresponds to the protrusion 12, and a secondary receiving cavity 120 is formed within the second surrounding plate 142. Along the thickness direction of the housing 1, two opposite sides of the second surrounding plate 142 form a second opening communicating with the secondary receiving cavity 120. The first opening and the second opening are located on the same side of the housing 1. The cover plate 15 has a flat plate structure, and the shape of the cover plate 15 matches the overall shape of the first opening and the second opening. The cover plate 15 includes a first flat plate 151 and a second flat plate 152 protruding from the first flat plate 151. The first flat plate 151 and the second flat plate 152 are integral structures. The two first flat plates 151 respectively cover the two first openings to form the main body 11, and the two second flat plates 152 respectively cover the two second openings to form protrusions 12. Correspondingly, the pole post 2 is mounted on one of the second flat plates 152. In this embodiment, the housing 1 can be disassembled into three parts for processing. That is, during the manufacturing process, the surrounding plate 14 and the two cover plates 15 are processed first, and then the cover plates 15 are welded to both sides of the surrounding plate 14 to form the housing 1.

[0046] like Figure 2 , Figure 3 and Figure 7 As shown, this utility model also provides a battery, including a battery casing and an electrode assembly. The battery casing includes a housing 1 and a terminal post 2 mounted on the housing 1. A main receiving cavity 110 and a secondary receiving cavity 120 are formed inside the housing 1. The electrode assembly includes a current collector and a positive electrode tab and a negative electrode tab disposed at one end of the current collector. The shape of the current collector matches the shape of the main receiving cavity 110, and the current collector is installed within the main receiving cavity 110. The positive electrode tab and the negative electrode tab are respectively housed within the two secondary receiving cavities 120. The terminal post 2 is a positive electrode post, and the terminal post 2 is electrically connected to the positive electrode tab. The entire housing 1 forms the negative electrode of the battery, and the negative electrode tab is connected to the inner wall of the second protrusion 122. It should be noted that the electrode assembly is composed of several positive electrode plates, negative electrode plates, and separators stacked alternately, and the corresponding current collector includes positive electrode plates, negative electrode plates, and separators stacked together.

[0047] Specifically, the battery also includes a protection board 4, which is a PCB board. The protection board 4 is electrically connected to the electrode assembly through the terminal posts 2 and the casing 1. The protection board 4 serves to monitor the charge and discharge of the entire battery. A groove 13 is formed between the two protrusions 12 in the battery casing and the main body 11. The protection board 4 is inserted between the two protrusions 12, that is, the protection board 4 is inserted and fixed to the groove 13. This structure utilizes the groove 13 to install and fix the protection board 4, and also allows the protection board 4 to occupy the internal space of the groove 13, making the overall battery structure more compact and improving the space utilization rate of the battery in the corresponding electronic product.

[0048] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery housing, characterized by include: The housing (1) includes a main body (11) with a main receiving cavity (110) formed therein. Two protrusions (12) extending outward toward the main receiving cavity (110) are formed on one side of the main body (11). A secondary receiving cavity (120) communicating with the main receiving cavity (110) is formed in the protrusions (12). The pole (2) is provided on at least one of the protrusions (12), and the pole (2) is mounted on one side of the protrusion (12) along the thickness direction of the housing (1).

2. The battery case of claim 1, wherein, The two protrusions (12) are spaced apart along a first direction, and the lengths of the two protrusions (12) in the first direction are L1 and L2, respectively, and L1 ≠ L2.

3. The battery case of claim 2, wherein, The two protrusions (12) are located at both ends of the main body (11) along the first direction.

4. The battery case of claim 1, wherein, The electrode post (2) is a positive electrode post, which is disposed on one of the protrusions (12), and the other protrusion (12) and the main body (11) together form the negative electrode of the battery.

5. The battery case of claim 1, wherein, There are two poles (2), one positive pole and one negative pole, which are respectively disposed on the two protrusions (12).

6. The battery case of claim 1, wherein, It also includes an insulating element (3), which is sandwiched between the pole post (2) and the protrusion (12).

7. The battery case of claim 1, wherein, The height of the protrusion (12) relative to the main body (11) is H, where H = 3.0 mm to 6.0 mm.

8. The battery case of claim 1, wherein, The thickness of the shell (1) is T, where T = 1.0 mm to 5.0 mm.

9. The battery case according to any one of claims 1 to 8, wherein The housing (1) includes a frame (16) and a cover plate (15). The frame (16) includes a first frame (161) and a second frame (162) protruding from the first frame (161). The first frame (161) forms the main receiving cavity (110). The first frame (161) forms a first opening communicating with the main receiving cavity (110) on one side along the thickness direction of the housing (1). The second frame (162) forms the secondary receiving cavity (120). The second frame (162) forms a second opening communicating with the secondary receiving cavity (120) on one side along the thickness direction of the housing (1). The cover plate (15) includes a first flat plate (151) and a second flat plate (152) protruding from the first flat plate (151). The first flat plate (151) covers the first opening, and the second flat plate (152) covers the second opening.

10. The battery case according to any one of claims 1 to 8, wherein The housing (1) includes a surrounding plate (14) and two cover plates (15). The surrounding plate (14) includes a first surrounding plate (141) and a second surrounding plate (142) protruding from the first surrounding plate (141). The main receiving cavity (110) is formed in the first surrounding plate (141). The first surrounding plate (141) forms a first opening communicating with the main receiving cavity (110) on both sides along the thickness direction of the housing (1). The secondary receiving cavity (120) is formed in the second surrounding plate (142). The second surrounding plate (142) forms a second opening communicating with the secondary receiving cavity (120) on both sides along the thickness direction of the housing (1). The cover plate (15) includes a first flat plate (151) and a second flat plate (152) protruding from the first flat plate (151). The two first flat plates (151) respectively cover the two first openings, and the two second flat plates (152) respectively cover the two second openings.

11. A battery, characterized by The battery includes an electrode assembly and a battery casing as described in any one of claims 1 to 10. The electrode assembly includes an electrode body and a positive tab and a negative tab disposed on the electrode body. The electrode body is housed in a main receiving cavity (110), and the positive tab and the negative tab are respectively housed in two secondary receiving cavities (120).

12. The battery of claim 11, wherein, It also includes a protective plate (4), which is inserted between two protrusions (12).

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