Square battery, assembling method and electric device

Abstract

The application relates to a square battery, an assembling method and an electric device, a shell, an opening of the shell, a notch in a side wall of the shell, the notch being communicated with the opening, an electric core in the shell, the electric core comprising a main body and a tab led out from the main body, an electric connecting piece electrically connected with the tab, the electric connecting piece being filled and / or covered at the notch, and a top cover arranged at the opening and sealing the opening.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a square battery, an assembly method, and an electrical device. Background Technology

[0002] Today, lithium-ion batteries, as a green and environmentally friendly new energy source, have advantages such as high reliability, high safety, small size, and light weight, and are now widely used in digital products, electric vehicles, military products and other fields.

[0003] Square batteries typically consist of a casing and a top cover. An opening is located at the top of the casing, and the top cover is positioned over this opening to seal the casing. The battery terminals are usually mounted on the top cover. This design results in significant wasted space between the top of the cell and the top cover, impacting the battery's energy density. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the technical defects of the prior art, which is that the square battery terminals are installed on the top cover, which wastes a lot of space and results in low battery energy density.

[0005] To solve the above-mentioned technical problems, the present invention provides a square battery, comprising: a casing having an opening and a notch on a side wall of the casing communicating with the opening; a battery cell located inside the casing, the battery cell including a body and tabs extending from the body; an electrical connector electrically connected to the tabs, the electrical connector filling and / or covering the notch; and a top cover disposed at the opening and sealing the opening.

[0006] In one embodiment of the present invention, the electrical connector includes a sheet body and a terminal post disposed on the sheet body, one end of the terminal post being electrically connected to the tab, and the sheet body being fixed to the housing.

[0007] In one embodiment of the present invention, a through first mounting hole is formed on the sheet body, the pole post is installed in the first mounting hole, and one end of the pole post electrically connected to the tab is flush with the inner surface of the side wall of the housing.

[0008] In one embodiment of the present invention, a first insulating member is provided between the sheet and the electrode post, the first insulating member being used to insulate the sheet and the electrode post.

[0009] In one embodiment of the present invention, the electrical connector further includes a second insulating member located between the sheet body and the battery cell.

[0010] In one embodiment of the present invention, a groove is formed on the side of the electrode post facing the battery cell, and at least a portion of the electrode tab is accommodated in the groove.

[0011] In one embodiment of the present invention, the electrode includes a positive electrode and a negative electrode; there are two notches, and each notch is provided with an electrical connector; the positive electrode is electrically connected to one of the electrical connectors, and the negative electrode is electrically connected to the other electrical connector.

[0012] In one embodiment of the present invention, the housing is a cuboid structure, and the housing includes: a first sidewall, a second sidewall and a fourth sidewall located on both sides of the first sidewall, and a third sidewall opposite to the first sidewall, wherein the area of ​​the first sidewall is larger than that of the second sidewall; the notch is located on the first sidewall or the third sidewall.

[0013] This invention discloses a method for assembling a square battery, comprising the following steps: obtaining a battery cell and a lead-out tab of the battery cell; obtaining an electrical connector; fixing the lead-out tab to the electrical connector; obtaining a housing, the housing having an opening and a notch on the side wall of the housing communicating with the opening; inserting the battery cell with the electrical connector fixed thereto into the housing through the opening; flipping the electrical connector so that the electrical connector fills and / or covers the notch; fixing the electrical connector to the housing; and installing a top cover at the opening of the housing.

[0014] In one embodiment of the present invention, the electrical connector includes a sheet and a post; the tab is fixed to the post, the electrical connector is flipped so that the sheet is located at the notch; the sheet is fixed to the housing.

[0015] In one embodiment of the present invention, a groove is provided on the pole post; after the end of the electrode tab extends into the groove, the pole post and the electrode tab are fixed.

[0016] This invention discloses a method for assembling a square battery, comprising the following steps: obtaining a housing having an opening and a notch on the side wall of the housing communicating with the opening; obtaining a battery cell with lead-out tabs; obtaining an electrical connector; inserting the battery cell into the housing through the opening, passing the lead-out tab through the notch and fixing it to the electrical connector; flipping the electrical connector so that it fills and / or covers the notch; fixing the electrical connector to the housing; and installing a top cover at the opening of the housing.

[0017] This invention discloses an electrical device, including the aforementioned square battery.

[0018] The square battery of the present invention has the following advantages over the prior art:

[0019] 1. In this invention, a notch is provided on the side wall of the casing. After the electrode tabs of the battery cell are fixed to the electrical connectors, the electrical connectors fill the notch or cover the notch. The terminals of the square battery in this invention are located on the side wall of the battery casing, thus saving battery space and increasing the energy density of the battery. Furthermore, the installation method of the square battery in this invention is simple and improves assembly efficiency.

[0020] 2. In existing technology, after the top cover and terminals are assembled, the battery is assembled on the production line. The laser welding fixation steps between the cell and the top cover are as follows: first, the tabs on the cell are ultrasonically welded to the adapter, and then the adapter is laser welded to the terminals on the top cover, thereby connecting and fixing the cell to the top cover. Since a cell is usually composed of at least two paired cells, both welding positions are located between the gaps of the two individual cells, making it difficult to prevent welding slag from splashing. Moreover, the cleaning of welding slag is generally done manually by visual inspection, which is time-consuming, labor-intensive, and difficult to thoroughly clean. As a result, welding slag can easily get trapped inside the bare cell, causing safety hazards. This invention can eliminate the adapter, and when the fixing method of the tabs and terminals in this invention is welding, it reduces one welding step, which reduces the generation of welding slag and energy loss, and also reduces costs. More importantly, the welding position in this invention is not located between the gaps of the individual cells, so the above problems do not occur.

[0021] 3. In the prior art, the battery cell needs to be connected to the top cover before it is installed in the casing. Since the positive and negative tabs are connected to the same top cover, if one tab has an installation error, it will directly affect the other tab. However, in this invention, the positive and negative tabs are independent and connected to the electrical connectors separately, without interfering with each other.

[0022] 4. Existing top covers have a certain weight. When the top cover is connected to the positive and negative tabs, the top cover is prone to pulling on the tabs during transportation due to gravity, posing a risk of the tabs falling off. However, the electrical connector in this invention is lightweight, which is sufficient to prevent the force from pulling on the tabs, thus ensuring the reliability of the connection between the tabs and the electrical connector throughout the entire installation process.

[0023] 5. In this invention, since a notch is made in the casing and the electrical connector fills and / or covers the notch, and the terminal is installed on the plate, in general, the installation of the terminal does not occupy any internal space of the battery. Therefore, the volume of the battery can be greatly reduced and the energy density of the battery can be improved.

[0024] The assembly method of the square battery of the present invention has the following advantages compared with the prior art:

[0025] The assembly method of the square battery of the present invention is simple, has high assembly accuracy, and produces a battery with high energy density. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the square battery structure of the present invention;

[0027] Figure 2 Schematic diagram of battery cell structure Figure 1 ;

[0028] Figure 3 Schematic diagram of battery cell structure Figure 2 ;

[0029] Figure 4 Schematic diagram of electrical connector structure Figure 1 ;

[0030] Figure 5 Schematic diagram of electrical connector structure Figure 2 ;

[0031] Figure 6 This is a schematic diagram of the structure of the pole and the second insulating component;

[0032] Figure 7 This is a schematic diagram of the shell structure.

[0033] Explanation of reference numerals in the accompanying drawings: 10, housing; 11, first sidewall; 12, second sidewall; 13, opening; 14, notch; 20, top cover; 30, electrical connector; 31, sheet; 32, pole; 321, groove; 33, first insulator; 34, second insulator; 40, battery cell; 41, tab. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0035] Reference Figures 1-7 As shown, this invention discloses a square battery, including a casing 10, a battery cell 40, an electrical connector 30, and a top cover 20. The casing 10 has an opening 13, and a notch 14 is formed on the side wall of the casing 10, communicating with the opening 13. The battery cell 40 is located inside the casing 10, and the battery cell 40 includes a body and a tab 41 extending from the body. The electrical connector 30 is electrically connected to the tab 41, and the electrical connector 30 fills and / or covers the notch 14. The top cover 20 is disposed at the opening 13 and seals the opening 13.

[0036] The working principle of this invention is as follows: a notch 14 is provided on the side wall of the casing 10. After the electrode 41 of the battery cell 40 is fixed to the electrical connector 30, the electrical connector 30 fills the notch 14 or covers the notch 14. In this invention, the electrical connector 30 of the square battery is provided on the side wall of the battery casing 10, thus saving battery space and increasing the energy density of the battery. Furthermore, the installation method of the square battery in this invention is simple and improves assembly efficiency.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] In existing technologies, the welding positions of the tab and the adapter, as well as the welding positions of the terminal and the adapter, are all located between the gaps of two individual battery cells. This makes it difficult to prevent solder slag from splashing, and the cleaning of solder slag is generally done manually by visual inspection, which is time-consuming, labor-intensive, and difficult to completely remove. Consequently, solder slag can easily accumulate inside the battery cells, creating safety hazards. This invention eliminates the adapter, and when the tab 41 and the electrical connector 30 are fixed by welding, one welding step is reduced, which reduces the generation of solder slag and energy loss, and lowers costs. More importantly, the welding positions in this invention are not located between the gaps of individual battery cells, thus avoiding the aforementioned problems.

[0039] It should be noted that, in this invention, the lead-out position of the tab 41 on the main body of the battery cell 40 can be designed according to the position of the notch 14. Usually, the tab 41 can be located on the side of the main body of the battery cell 40. Of course, the tab 41 can also be located on the top of the battery cell 40, so that the tab 41 occupies a small space in the housing 10.

[0040] In some embodiments, the electrical connector 30 includes a sheet 31 and a terminal post 32 disposed on the sheet 31. One end of the terminal post 32 is electrically connected to the tab 41, and the sheet 31 is fixed to the housing 10.

[0041] Furthermore, to further reduce the battery size, a through-hole is formed on the sheet 31 along its thickness direction. The terminal 32 is installed in the first mounting hole, and one end of the terminal 32 that is electrically connected to the tab 41 is flush with the inner surface of the side wall of the housing 10. This avoids the terminal 32 protruding too much towards the cell 40, thus preventing the waste of internal battery space.

[0042] It should be noted that the electrical connection between the terminal 32 and the tab 41 can be direct or indirect, with direct connection being preferred, i.e., eliminating the existing adapter piece. When the tab 32 and the terminal 41 are directly connected, the connection method can be welding or bonding, with welding being preferred. The terminal 32 is fixed to the housing 10 via the sheet 31. The terminal 32 and the sheet 31 can be a separate structure or an integrated structure. Alternatively, the terminal 32 can be fixed directly to the housing 10 without the sheet 31. When the sheet 31 is used, the convenience and accuracy of battery assembly can be improved.

[0043] In this invention, the sheet 31 can be made of either an insulating or a conductive material. When the sheet 31 is made of a conductive material, a first insulating element 33 can be provided between the sheet 31 and the electrode 32 to achieve insulation between them. The first insulating element 33 can be made of rubber or plastic and is arranged around the electrode 32. The first insulating element 33 can be manufactured by injection molding. Specifically, the sheet 31 and the electrode 32 are placed at a predetermined position in the cavity, and a colloid is injected into the gap between the sheet 31 and the electrode 32. After molding, this colloid becomes the first insulating element 33.

[0044] The electrical connector 30 also includes a second insulator 34, which is located between the sheet 31 and the battery cell 40. The function of the second insulator 34 is to prevent electrical conduction between the sheet 31 and the battery cell 40. The material of the second insulator 34 can also be plastic or rubber, as long as it can achieve the insulation effect. Of course, the second insulator 34 can also be an insulating coating or an insulating film, thus ensuring that the second insulator 34 is light and thin and does not occupy the internal space of the battery casing 10.

[0045] The present invention provides a notch 14 in the housing 10, while fixing the sheet 31 and the housing 10, and mounting the electrode 32 on the sheet 31. In general, the mounting of the electrode 32 does not occupy any internal space of the battery. Therefore, the battery volume can be greatly reduced and the energy density of the battery can be improved.

[0046] Typically, the battery cell 40 has a positive tab and a negative tab. The positive tab is welded to the positive terminal 32 and the negative tab is welded to the negative terminal 32.

[0047] Both the positive terminal 32 and the negative terminal 32 can be insulated from the housing; alternatively, one terminal 32 can be electrically connected to the housing 10, while the other terminal 32 is insulated from the housing 10, which means that the housing 10 can be energized.

[0048] In one embodiment, there is only one notch 14, and both the positive terminal 32 and the negative terminal 32 are located at the notch 14. The advantage of this structure is that the design of the housing 10 only requires one notch 14, and the positive terminal 32 and the negative terminal 32 can share a single sheet 31, which facilitates processing.

[0049] In another embodiment, there are two notches 14, each notch 14 corresponding to an electrical connector 30. The positive tab 41 is electrically connected to the terminal 32 of one of the electrical connectors 30, and the negative tab 41 is electrically connected to the terminal 32 of the other electrical connector 30. This design has three advantages: First, since the two electrical connectors 30 are set separately, the installation error of one tab 41 or terminal 32 will not affect the other tab 41 or terminal 32, thus improving assembly accuracy. Furthermore, since both electrical connectors 30 are fixed with the housing 10 as a reference, the structural strength and assembly accuracy of the battery can be further improved. Second, since the two electrical connectors 30 are designed separately, the positions of the two notches 14 and the installation positions of the positive and negative terminals can be flexibly designed, providing high flexibility. Third, since the positive and negative terminals 32 are light, they are sufficient to generate a pulling force on the tab 41, ensuring the connection reliability of the tab 41 and terminal 32 throughout the installation process.

[0050] To improve welding performance and increase the structural strength of the battery, the sheet 31 and the casing 10 can be made of the same material, such as both being made of aluminum. Furthermore, the sheet 31 has a contoured structure to mimic the notch 14, allowing the sheet 31 to either fill or cover the notch 14. To facilitate assembly and fixation between the sheet 31 and the casing 10, the sheet 31 can be snapped onto the casing 10 first, and then welded to the casing 10 for final fixation.

[0051] To further reduce the internal space of the battery and increase energy density, a groove 321 is formed on the side of the terminal 32 facing the cell 40, and at least part of the tab 41 is accommodated in the groove 321. In this way, the tab 41 will not occupy too much battery space. Combining the structural design described above, a through first mounting hole is formed on the sheet 31 along the thickness direction. The terminal 32 is installed in the first mounting hole, and the end of the terminal 32 that is electrically connected to the tab 41 is flush with the inner surface of the side wall of the housing 10. With this structural cooperation, in this invention, neither the tab 41 nor the terminal 32 occupies the internal space of the battery housing 10, resulting in high energy density.

[0052] The housing 10 has a cuboid structure and includes: a first sidewall 11, a second sidewall 12 and a fourth sidewall located on both sides of the first sidewall 11, and a third sidewall opposite to the first sidewall 11. The area of ​​the first sidewall 11 is larger than that of the second sidewall 12. A notch 14 is located on either the first sidewall 11 or the third sidewall. Since this invention is a square battery, placing the notch 14 on the large surface of the battery facilitates processing and assembly.

[0053] The assembly method of the square battery in this invention will be described in detail below.

[0054] Example 1

[0055] This invention discloses a method for assembling a square battery, comprising the following steps:

[0056] Obtain the battery cell 40 and the lead tab 41 of the battery cell 40. Here, the lead position of the lead tab 41 on the main body of the battery cell 40 can be designed according to the position of the notch 14. Usually, the position of the lead tab 41 can be located on the side of the main body of the battery cell 40. Of course, the lead tab 41 can also be located on the top of the battery cell 40, so that the lead tab 41 occupies a small space in the housing 10.

[0057] Obtain an electrical connector 30, which includes a sheet 31 and a terminal 32. The sheet 31 and the terminal 32 are connected. Alternatively, the sheet 31 can be omitted, and the terminal 32 can be directly fixed to the housing 10. When the sheet 31 is used, the convenience and accuracy of battery assembly can be improved.

[0058] The tab 41 is welded to the terminal post 32. In another embodiment, a groove 321 is formed on the terminal post 32. After the end of the tab 41 extends into the groove 321, the terminal post 32 and the tab 41 are welded to each other. Here, the tab 41 is at least partially accommodated in the groove 321. In this way, the tab 41 does not occupy too much battery space, improving the space utilization of the battery. In addition, the tab 41 and the terminal post 32 can also be fixed by adhesive bonding, for example, using a highly viscous conductive adhesive.

[0059] Obtain the housing 10, which has an opening 13 and a notch 14 on its side wall, which communicates with the opening 13.

[0060] The battery cell 40, with the terminal post 32 welded to it, is inserted into the housing 10 through the opening 13. The electrical connector 30 is then flipped over so that it fills and / or covers the notch 14. Here, because the notch 14 is made in the housing 10, and the electrical connector 30 fills and / or covers the notch 14, and the terminal post 32 is mounted on the sheet 31, the mounting of the terminal post 32 does not occupy any internal space of the battery. Therefore, the battery volume can be greatly reduced, and the energy density of the battery can be increased.

[0061] The sheet 31 is fixed to the housing 10. Here, the sheet 31 and the housing 10 can be fixed by welding or bonding, preferably by welding so that the sheet 31 seals the notch 14 of the housing 10.

[0062] A top cover 20 is installed at the opening 13 of the housing 10. At this time, since the battery terminals 32 are located on the side wall, the top space is reduced, thus increasing the energy density.

[0063] The advantages of the assembly method of the present invention are:

[0064] Firstly, in this invention, since the side of the housing 10 is provided with a notch 14, and the electrical connector 30 fills and / or covers the notch 14, and the electrode post 32 is disposed on the sheet body 31, it can be ensured that the electrode post 32 and the sheet body 31 do not occupy the internal space of the battery, and the tab 41 is directly connected to the electrode post 32, which further reduces the internal space of the battery and improves the energy density.

[0065] Secondly, the assembly method of the present invention is simple, simplifying the existing battery installation method.

[0066] Thirdly, since the gap between the battery cell 40 and the housing 10 is small, it is impossible to install the electrode post 32 onto the notch 14 from inside the housing 10. Therefore, the present invention provides a notch 14 and a sheet 31 that mates with the notch 14, which facilitates the installation of the electrode post 32.

[0067] Example 2

[0068] This invention discloses a method for assembling a square battery, comprising the following steps:

[0069] Obtain the housing 10, which has an opening 13 and a notch 14 on its side wall, which communicates with the opening 13.

[0070] Obtain battery cell 40 and lead tab 41 of battery cell 40.

[0071] An electrical connector 30 is obtained, which includes a plate 31 and a pole 32, and the plate 31 and the pole 32 are insulated from each other.

[0072] The battery cell 40 is inserted into the housing 10 through the opening 13, and the tab 41 is passed through the notch 14 and then welded to the terminal post 32 for fixation. Alternatively, the tab 41 and the terminal post 32 can also be fixed by adhesive bonding.

[0073] Flip the electrical connector 30 so that it fills and / or covers the notch 14.

[0074] Fix the sheet 31 to the housing 10.

[0075] Install the top cover 20 at the opening 13 at the housing 10.

[0076] The difference between the assembly methods in the two embodiments described above is as follows: In Embodiment 1, the tab 41 of the battery cell 40 is first connected to the terminal post 32, then the battery cell 40 is installed into the housing 10, and finally, the sheet 31 is welded and fixed to the notch 14. In Embodiment 2, the battery cell 40 is first installed into the housing 10, then the tab 41 of the battery cell 40 is passed through the notch 14 and connected to the terminal post 32, and finally, the sheet 31 is fixed to the notch 14. Both assembly methods can realize the assembly of the square battery in this invention, and technicians can choose the corresponding assembly method according to their needs.

[0077] This invention discloses an electrical device including the aforementioned square battery. The main design feature of this invention lies in the structural improvement of the battery itself. Other structural aspects of the electrical device, such as its electrical connections and mechanical components, will not be elaborated upon. The electrical device can be various types of devices, such as automobiles, mobile phones, computers, ships, spacecraft, electric toys, and power tools, etc.

[0078] The embodiments of the present invention do not impose any special limitations on the above-mentioned electrical equipment.

[0079] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A square battery, characterized in that, include: The shell (10) has an opening (13) and a notch (14) is provided on the side wall of the shell (10), and the notch (14) communicates with the opening (13); The battery cell (40) is located inside the housing (10) and includes a main body and tabs (41) extending from the main body. Electrical connector (30) is electrically connected to tab (41), electrical connector (30) fills and / or covers notch (14), electrical connector (30) includes sheet (31) and pole (32) disposed on sheet (31), one end of pole (32) is electrically connected to tab (41), sheet (31) is fixed to housing (10); Top cover (20) is provided at the opening (13) and seals the opening (13).

2. The square battery according to claim 1, characterized in that, A through first mounting hole is formed on the plate (31), and the pole (32) is installed in the first mounting hole. The end of the pole (32) that is electrically connected to the tab (41) is flush with the inner surface of the side wall of the housing (10).

3. The square battery according to claim 1, characterized in that, A first insulating element (33) is provided between the plate (31) and the pole (32), and the first insulating element (33) is used to insulate the plate (31) and the pole (32).

4. The square battery according to claim 1, characterized in that, The electrical connector (30) further includes a second insulating member (34) located between the sheet (31) and the battery cell (40).

5. The square battery according to claim 1, characterized in that, A groove (321) is provided on the side of the electrode post (32) facing the cell (40), and at least part of the tab (41) is accommodated in the groove (321).

6. The square battery according to claim 1, characterized in that, The electrode tab (41) includes a positive electrode tab and a negative electrode tab; There are two notches (14), and each notch (14) is provided with an electrical connector (30); The positive electrode tab is electrically connected to one of the electrical connectors (30), and the negative electrode tab is electrically connected to the other electrical connector (30).

7. The square battery according to claim 1, characterized in that, The shell (10) is a cuboid structure, and the shell (10) includes: a first sidewall (11), a second sidewall (12) and a fourth sidewall located on both sides of the first sidewall (11), and a third sidewall opposite to the first sidewall (11). The area of ​​the first sidewall (11) is larger than that of the second sidewall (12). The notch (14) is located on the first sidewall (11) or the third sidewall.

8. A method for assembling a square battery, used for assembling the square battery according to any one of claims 1 to 7, characterized in that, Includes the following steps: Obtain the battery cell (40) and the lead-out tab (41) of the battery cell (40); Obtain electrical connector (30); Secure the electrode tab (41) to the electrical connector (30); Obtain a housing (10), the housing (10) has an opening (13), and a notch (14) is provided on the side wall of the housing (10), the notch (14) is connected to the opening (13); Insert the battery cell (40) with the fixed electrical connector (30) into the housing (10) through the opening (13), and flip the electrical connector (30) so that the electrical connector (30) fills and / or covers the notch (14); Secure the electrical connector (30) to the housing (10); Install a top cover (20) at the opening (13) of the housing (10).

9. The assembly method of the square battery according to claim 8, characterized in that, The electrical connector (30) includes a plate (31) and a terminal (32); Fix the tab (41) to the pole (32), and flip the electrical connector (30) so that the plate (31) is located at the notch (14); Fix the sheet (31) to the shell (10).

10. The assembly method of the square battery according to claim 8, characterized in that, A groove (321) is provided on the pole post (32); After the end of the tab (41) extends into the groove (321), the pole post (32) is fixed to the tab (41).

11. A method for assembling a square battery, used for assembling the square battery according to any one of claims 1 to 7, characterized in that, Includes the following steps: Obtain a housing (10), the housing (10) has an opening (13), and a notch (14) is provided on the side wall of the housing (10), the notch (14) is connected to the opening (13); Obtain the battery cell (40) and the lead-out tab (41) of the battery cell (40); Obtain electrical connector (30); Insert the battery cell (40) into the housing (10) through the opening (13), and fix the electrode tab (41) through the notch (14) to the electrical connector (30); Flip the electrical connector (30) so that the electrical connector (30) fills and / or covers the notch (14); Secure the electrical connector (30) to the housing (10); Install a top cover (20) at the opening (13) of the housing (10).

12. An electrical appliance, characterized in that, Includes the square battery as described in any one of claims 1-7.

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