Battery and electric equipment

Abstract

The utility model discloses a battery, which comprises a battery module, a conductive piece and a protective seat, and a connecting piece serving as a positive electrode or a negative electrode is outwards led out from the battery module; the protective seat comprises a protective shell and a supporting piece arranged in the protective shell, and the supporting piece is provided with a supporting surface; the connecting piece and the conductive piece are connected with each other in the protective shell and are fixed on the supporting surface of the supporting piece, the supporting surface protrudes relative to the protective shell, gaps are reserved between the connecting piece and the protective shell and between the conductive piece and the protective shell, a conductive main body in the conductive piece is a hard metal component, and the conductive main body is made of metal. The conductive piece is used for leading the connecting piece outwards to a preset position; the technical problem that the safety of an existing battery structure needs to be improved in a high-voltage environment is mainly solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] At present, the connecting piece serving as the positive or negative electrode on the battery module is connected to a soft copper busbar to achieve the purpose of being led outward. A protective seat is usually provided at the connection between the connecting piece and the soft copper busbar. The protective seat is used to cover the exposed ends of the connecting piece and the copper busbar on the battery module to prevent the battery from short circuiting and improve the safety of operators when installing or maintaining the battery.

[0003] The existing soft copper busbar and connecting piece have a large contact area with the outer shell of the protective seat after being connected, which will cause the soft copper busbar and the connecting piece to accumulate a large amount of heat at the protective seat. When in a high-voltage discharge or high-voltage charging environment (such as the charging and discharging process of new energy vehicles), the heat accumulated in the protective seat may cause the battery module to have thermal runaway. The accumulated heat will also be transmitted to the external BDU module, making the temperature of the BDU module easily exceed the preset temperature range. In addition, the soft copper busbar has a high internal resistance due to its long length, so the heat generated by the soft copper busbar itself is also high, which is easy to cause the battery module to have thermal runaway or cause the external BDU module to malfunction. In addition, the soft copper busbar has a high manufacturing cost due to its complex processing technology, and the structural strength of the soft copper busbar is low, and it is easy to move when it is vibrated. The soft copper busbar is easy to be torn off when it moves.

[0004] As can be seen from the above, the existing structure of connecting the soft copper busbar and the connecting piece with a protective seat has certain safety hazards. How to improve the safety of battery use under high-voltage environment is a technical problem in the current battery field. Utility Model Content

[0005] The utility model aims to provide a battery, which mainly solves the technical problem that the safety of the existing battery structure needs to be improved under high-voltage environment.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A battery, comprising a battery module, a conductive member and a protective seat, wherein a connecting piece serving as a positive electrode or a negative electrode is led outward from the battery module;

[0008] The protective seat includes a protective shell and a support member arranged in the protective shell, and the support member has a support surface; the connecting piece and the conductive member are connected to each other in the protective shell and fixed on the support surface of the support member, and the support surface is raised relative to the protective shell, so that there is a gap between the connecting piece and the conductive member and the protective shell, and the conductive body inside the conductive member is a hard metal component, and the conductive member is used to lead the connecting piece outward to a preset position.

[0009] In one of the technical solutions, the conductive part includes a conductive body and a plastic-dipped sleeve and mica paper wrapped in sequence on the outer wall of the conductive body, the conductive part exposes the conductive body at the end position, the conductive body is connected to the connecting piece in the protective shell and fixed on the supporting surface of the supporting part.

[0010] In one of the technical solutions, at least one bent energy absorbing portion is provided on the conductive member.

[0011] In one of the technical solutions, the battery further includes a box body, the battery module, the conductive member and the protective seat are all placed in the box body, and foam is provided at the bottom of the conductive member, and the foam is against the box body.

[0012] In one technical solution, the battery includes a plurality of conductive members, and the plurality of conductive members include a first conductive member and a second conductive member;

[0013] A plurality of connecting plates are led out from the battery module, and the plurality of connecting plates include a total positive connecting plate and a total negative connecting plate, the total positive connecting plate is connected to the first conductive member, and the total negative connecting plate is connected to the second conductive member;

[0014] The protective seat is provided at at least one of the positions where the total positive connecting plate is connected to the first conductive member and the positions where the total negative connecting plate is connected to the second conductive member.

[0015] In one of the technical solutions, the battery includes a plurality of protective seats, and the plurality of protective seats include a first protective seat and a second protective seat;

[0016] The total positive connecting plate and the first conductive member are interconnected in the first protective seat and fixed on the support surface in the first protective seat, and the total negative connecting plate and the second conductive member are interconnected in the second protective seat and fixed on the support surface in the second protective seat.

[0017] In one of the technical solutions, the battery includes multiple conductive parts, the multiple conductive parts include a third conductive part, the battery module includes at least two interconnected battery modules, the battery module has the connecting piece extended outward, and among the two connected battery modules, the connecting piece on one of the battery modules is connected to the connecting piece on the other battery module through the third conductive part, and the protective seat is provided at the connection between the third conductive part and at least one of the connected connecting pieces.

[0018] In one of the technical solutions, a third protective seat is provided at the first end of the third conductive member, and a fourth protective seat is provided at the second end of the third conductive member away from the first end;

[0019] The first end of the third conductive member and the connecting piece on an adjacent battery module are interconnected in the third protective seat and fixed on the support surface in the third protective seat, and the second end of the third conductive member and the connecting piece on another adjacent battery module are interconnected in the fourth protective seat and fixed on the support surface in the fourth protective seat.

[0020] In one of the technical solutions, the battery also includes a BDU module, a discharge interface and a charging interface. The first conductive member and the second conductive member are both electrically connected to the BDU module. The positive and negative electrodes on the discharge interface and the positive and negative electrodes on the charging interface are both electrically connected to the BDU module through hard metal parts. The outer walls of each of the hard metal parts are wrapped with a plastic-impregnated sleeve and mica paper in sequence.

[0021] The present application also provides an electrical device, comprising a battery as described in any of the above technical solutions.

[0022] Compared with the prior art, the battery provided by the utility model has at least the following beneficial effects:

[0023] This solution uses a hard conductive part to connect the connecting piece of the battery module to lead the positive or negative electrode on the battery module outward. The hard conductive part has a higher structural strength than the traditional soft copper busbar and will not break due to movement, thereby improving the safety of the battery; secondly, the length of the hard conductive part leading outward can be made shorter than that of the traditional soft copper busbar, reducing the internal resistance of the battery, that is, reducing the heat generated by the battery per unit time, thereby reducing the heat conducted into the battery module or the external BDU module, reducing the risk of thermal runaway of the battery module and reducing the risk of the BDU module being damaged due to excessive heat. The risk of failure is reduced, thereby further improving the safety of the battery; further, after the conductive member of the present solution and the connecting piece on the battery module are connected in the protective shell, a gap is left between the protective shell, so that a large amount of heat will not accumulate at the connection between the conductive member and the connecting piece of the battery module, that is, the risk of thermal runaway of the battery module is further reduced and the risk of failure of the BDU module due to excessive heat is further reduced, thereby further improving the safety of the battery; in addition, since the processing technology of the hard conductive member is simpler than that of the soft copper busbar, its manufacturing cost is lower than that of the soft copper busbar, thereby reducing the production cost of the battery;

[0024] In summary, this solution can greatly improve the safety of the battery during high-voltage charging and discharging, and can also reduce the production cost of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A schematic diagram of the structure of a battery provided in Example 1 of the present application;

[0027] Figure 2 for Figure 1 an exploded view of the structure shown;

[0028] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0029] Figure 4 This is a schematic diagram of the structure of the conductive member and the foam provided in Example 1 of the present application;

[0030] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0031] Figure 6 A schematic diagram of the structure of a battery provided in Example 2 of the present application;

[0032] Figure 7 for Figure 6 The schematic diagram of the structure of the battery shown is after adding the BDU module, the discharge interface and the charging interface;

[0033] Figure 8 for Figure 7 A partial enlarged view of point C in the middle.

[0034] Among them, the reference numerals in the figure are:

[0035] 1. Battery module; 10. Battery cell; 11. Connecting piece; 111. First through hole; 12. Total positive connecting piece; 13. Total negative connecting piece;

[0036] 2. Conductive member; 21. Conductive body; 211. Second through hole; 22. Plastic-impregnated sleeve; 23. Mica paper; 24. Bend portion; 25. First conductive member; 26. Second conductive member; 27. Third conductive member;

[0037] 3. Protective seat; 31. Protective shell; 311. Protective upper shell; 312. Protective lower shell; 32. Support member; 321. Support surface; 322. Threaded hole; 33. First protective seat; 34. Second protective seat; 35. Third protective seat; 36. Fourth protective seat;

[0038] 4. Foam; 5. BDU module; 6. Discharge interface; 7. Charging interface; 8. Hard metal parts; 100. Battery module; 200. Series structure. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0041] It should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0044] Embodiment 1

[0045] Please also read Figures 1 to 3 The present embodiment provides a battery, comprising a battery module 1, a conductive member 2 and a protective seat 3, wherein a connecting piece 11 as a positive electrode or a negative electrode is led outward from the battery module 1, the protective seat 3 comprises a protective shell 31 and a support member 32, the support member 32 is arranged inside the protective shell 31, a support surface 321 is provided on the support member 32, the connecting piece 11 on the battery module 1 and the conductive member 2 are connected in the protective shell 31 and fixed on the support surface 321 of the support member 32, the conductive member 2 is used to lead the connecting piece 11 of the battery module 1 outward to a preset position (for example, to other batteries, or to an external BDU module), the protective shell 31 can protect the part where the connecting piece 11 and the conductive member 2 are connected, on the one hand, the risk of battery short circuit can be reduced, and on the other hand, it can avoid the occurrence of safety accidents caused by accidental touch during installation or disassembly maintenance by operators, thereby improving the safety of operators.

[0046] In this embodiment, the conductive body 21 inside the conductive member 2 is a hard metal component (such as copper with good conductivity). Compared with the traditional soft copper busbar, the hard conductive member 2 has a higher structural strength and will not break due to vibration, thereby improving the safety of the battery. Secondly, the length of the hard conductive member 2 extending outward can be made shorter than that of the traditional soft copper busbar, reducing the internal resistance of the battery, that is, reducing the heat generated by the battery per unit time, thereby reducing the heat conducted to the battery module 1 or the external BDU module, reducing the risk of thermal runaway of the battery module 1 and reducing the risk of failure of the BDU module due to excessive heat, thereby further improving the safety of the battery. In addition, since the processing technology of the hard conductive member 2 is simpler than that of the soft copper busbar, its manufacturing cost is lower than that of the soft copper busbar, thereby reducing the production cost of the battery.

[0047] Please also read Figure 4 and Figure 5 The conductive part 2 specifically includes a conductive body 21 and a plastic-dipped sleeve 22 and mica paper 23 which are sequentially wrapped around the outer wall of the conductive body 21. The plastic-dipped sleeve 22 has good insulation properties, further reducing the risk of short circuit of the battery module 1. The mica paper 23 has good insulation and heat insulation properties, preventing a large amount of external heat from being conducted into the battery module 1 through the conductive part 2, thereby further improving the safety of the battery. Specifically, the conductive part 2 exposes the conductive body 21 at the end position, and the conductive body 21 is interconnected with the connecting piece 1 in the protective shell 31 and fixed on the supporting surface 321 of the above-mentioned support member 32. In addition, when the length of the conductive part 2 is relatively long, a piece of foam 4 can be bonded to the bottom of the conductive part 2. The foam 4 can absorb the energy of the conductive part 2 when it is vibrated, thereby improving the reliability of the connection between the conductive part 2 and the connecting piece 11. In addition, at least one bending portion 24 can be provided on the conductive member 2, and the bending portion 24 can absorb the internal stress of the conductive member 2 when deformed, and can eliminate the assembly tolerance between the conductive member 2 and the connecting piece 11, thereby improving the reliability of the connection between the conductive member 2 and the connecting piece 11.

[0048] In this embodiment, the present scheme also designs the supporting surface 321 on the supporting member 32 in the protective seat 3 to protrude relative to the protective shell 31, so that when the conductive member 2 and the connecting piece 11 on the battery module 1 are connected in the protective shell 31, a gap is left between the protective shell 31, so that a large amount of heat will not accumulate at the connection between the conductive member 2 and the connecting piece 11 of the battery module 1, which further reduces the risk of thermal runaway of the battery module 1 and further reduces the risk of failure of the BDU module due to excessive heat, thereby further improving the safety of the battery.

[0049] In this embodiment, a screw (not shown in the figure) is provided in the protective shell 31, and a threaded hole 322 penetrating the supporting surface 321 is provided on the support member 32. The threaded hole 322 is used to connect with the screw, and a first through hole 111 is provided on the connecting piece 11, and a second through hole 211 is provided on the conductive piece 2. During installation, the conductive piece 2 and the connecting piece 11 can be fixed on the supporting surface 321 by passing the screw through the first through hole 111 and the second through hole 211 and then connecting the screw in the threaded hole 322.

[0050] In this embodiment, the protective shell 31 specifically includes a detachably connected protective upper shell 311 and a protective lower shell 312, the support member 32 is embedded and fixed on the protective lower shell 312, the support surface 321 on the support member 32 protrudes upward by 1mm relative to the protective lower shell 312, and the protective upper shell 311 is used to cover the part where the connecting piece 11 and the conductive member 2 are connected to each other. When installing, the connecting piece 11 and the conductive member 2 are first fixed on the protective lower shell 312, and then the protective upper shell 311 is buckled on the protective lower shell 312, so that the connecting piece 11 and the conductive member 2 can be protected.

[0051] In summary, the battery using this solution can greatly improve the safety of the battery during high-voltage charging and discharging, and can also reduce the production cost of the battery.

[0052] Embodiment 2

[0053] Please also read Figures 6 to 8 The present embodiment provides another battery. The battery of the present embodiment includes a plurality of conductive members 2 with the same structure and a plurality of protective seats 3 with the same structure. The plurality of conductive members 2 include at least a first conductive member 25 and a second conductive member 26. The plurality of protective seats 3 include at least a first protective seat 33 and a second protective seat 34. The battery module 1 includes a plurality of battery cells 10 connected in series in sequence. A total positive connecting piece 12 is led outward from the electrode of the first battery cell 10. A total negative connecting piece 13 is led outward from the motor of the last battery cell 10. The total positive connecting piece 12 and the first conductive member 25 are interconnected in the first protective seat 33 and fixed on a support surface 321 in the first protective seat 33. The total negative connecting piece 13 and the second conductive member 26 are interconnected in the second protective seat 34 and fixed on a support surface 321 in the second protective seat 34. In other words, the first conductive member 25 is used to lead out the total positive pole of the battery module 1, and the second conductive member 26 is used to lead out the total negative pole of the battery module 1, and a large amount of heat will not accumulate in the first protective seat 33 and the second protective seat 34, so as to reduce the risk of thermal runaway of the battery module 1.

[0054] In this embodiment, the plurality of conductive members 2 further include a plurality of third conductive members 27, and the plurality of protective seats 3 further include a plurality of third protective seats 35 and a plurality of fourth protective seats 36. Specifically, the plurality of battery cells 10 are divided into a plurality of battery modules 100, and each battery module 100 has two connecting pieces 11 led outwardly, one of the connecting pieces 11 led out of each battery module 100 is used as a positive electrode, and the other connecting piece 11 led out of each battery module 100 is used as a negative electrode. In other words, one of the connecting pieces 11 led out of the first battery module 100 is used as the above-mentioned total positive connecting piece 12, and one of the connecting pieces 11 led out of the last battery module 100 is used as the above-mentioned total negative connecting piece 13. More specifically, a series structure 200 is connected between two adjacent groups of battery modules 100, and each series structure 200 includes the above-mentioned third conductive member 27, a third protective seat 35 and a fourth protective seat 36, wherein one end of the third conductive member 27 is mutually connected with the connecting piece 11 on an adjacent group of battery modules 100 in the third protective seat 35 and fixed on the supporting surface 321 in the third protective seat 35, and the other end of the third conductive member 27 is mutually connected with the connecting piece 11 on another adjacent group of battery modules 100 in the fourth protective seat 36 and fixed on the supporting surface 321 of the fourth protective seat 36, and the polarities of the connecting pieces 11 connected at both ends of the third conductive member 27 are opposite, so that the third conductive member 27 can connect the two adjacent groups of battery modules 100 in series. By setting up multiple series structures 200, all battery modules 100 are connected in series in sequence.

[0055] Preferably, in this embodiment, the multiple battery cells 10 of this embodiment are divided into four groups of battery modules 100, each group of battery modules 100 includes a plurality of battery cells 10 connected in series and arranged in sequence along a first direction (i.e., the Y-axis direction), and the multiple groups of battery modules 100 are arranged in sequence along a second direction (i.e., the X-axis direction), wherein the X-axis direction and the Y-axis direction are preferably perpendicular to each other.

[0056] Please also read Figure 7 and Figure 8The battery of this embodiment also includes a BDU module 5 (the full name of BDU in English is Battery Distribution Unit, and the Chinese name of BDU is Battery Cut-off Unit), a discharge interface 6 and a charging interface 7. The first conductive member 25 and the second conductive member 26 mentioned above are both electrically connected to the BDU module 5. The positive and negative electrodes on the discharge interface 6 and the positive and negative electrodes on the charging interface 7 are both electrically connected to the BDU module 5 through a hard metal member 8, so that the BDU module 5 can serve as a bridge connecting the battery module 1, external electrical appliances and external power sources. A plurality of relays are arranged in the BDU module 5, and the plurality of relays jointly control the power-on and power-off process, the pre-charging process and the charging process of the battery module 1 in the high-voltage electrical circuit. Among them, the outer wall of each hard metal member 8 is also wrapped with a plastic-impregnated sleeve and mica paper in sequence to reduce the heat conducted by the hard metal member 8 into the BDU module 5, reduce the risk of failure of the BDU module 5, and thus improve the safety of the battery.

[0057] In summary, the battery of this embodiment also has the advantage of extremely high safety in a high-voltage charging and discharging environment.

[0058] Embodiment 3

[0059] This embodiment provides an electrical device, including an electrical device and the battery described in Embodiment 1 or Embodiment 2. The electrical device and the battery are electrically connected, and the battery supplies power to the electrical device. The electrical device may be a new energy vehicle. Since the battery has high safety, the safety of the electrical device is also improved.

[0060] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A battery, characterized in that: It comprises a battery module (1), a conductive member (2) and a protective seat (3), wherein a connecting piece (11) serving as a positive electrode or a negative electrode is led outward from the battery module (1); The protective seat (3) comprises a protective shell (31) and a support member (32) arranged in the protective shell (31), wherein the support member (32) has a support surface (321); the connecting piece (11) and the conductive member (2) are mutually connected in the protective shell (31) and fixed on the support surface (321) of the support member (32), wherein the support surface (321) is protruding relative to the protective shell (31), so that a gap is left between the connecting piece (11) and the conductive member (2) and the protective shell (31); the conductive body (21) inside the conductive member (2) is a hard metal component, and the conductive member (2) is used to lead the connecting piece (11) outward to a preset position.

2. The battery according to claim 1, characterized in that The conductive member (2) comprises a conductive body (21) and a plastic-impregnated sleeve (22) and mica paper (23) sequentially wrapped around the outer wall of the conductive body (21); the conductive member (2) exposes the conductive body (21) at an end position; the conductive body (21) is connected to the connecting piece (11) in the protective shell (31) and fixed on a supporting surface (321) of the supporting member (32).

3. The battery according to claim 1, characterized in that The conductive member (2) is provided with at least one bent energy absorbing portion (24).

4. The battery according to claim 1, characterized in that The battery further comprises a box body, wherein the battery module (1), the conductive member (2) and the protective seat (3) are all placed in the box body, and a foam (4) is arranged at the bottom of the conductive member (2), and the foam (4) abuts against the box body.

5. The battery according to claim 1, characterized in that The battery comprises a plurality of conductive members (2), wherein the plurality of conductive members (2) comprises a first conductive member (25) and a second conductive member (26); A plurality of connecting plates (11) are led out from the battery module (1), the plurality of connecting plates (11) comprising a total positive connecting plate (12) and a total negative connecting plate (13), the total positive connecting plate (12) is connected to the first conductive member (25), and the total negative connecting plate (13) is connected to the second conductive member (26); The protective seat (3) is provided at at least one of the positions where the total positive connecting piece (12) and the first conductive member (25) are connected to each other and the positions where the total negative connecting piece (13) and the second conductive member (26) are connected to each other.

6. The battery according to claim 5, characterized in that The battery comprises a plurality of protective seats (3), wherein the plurality of protective seats (3) comprise a first protective seat (33) and a second protective seat (34); The total positive connecting piece (12) and the first conductive member (25) are interconnected in the first protective seat (33) and fixed on a supporting surface (321) in the first protective seat (33); the total negative connecting piece (13) and the second conductive member (26) are interconnected in the second protective seat (34) and fixed on a supporting surface (321) in the second protective seat (34).

7. The battery according to claim 1, characterized in that The battery comprises a plurality of conductive members (2), the plurality of conductive members (2) comprising a third conductive member (27), the battery module (1) comprising at least two interconnected battery modules (100), the battery module (100) having the connecting piece (11) extending outward, and in the two connected battery modules (100), the connecting piece (11) on one of the battery modules (100) is connected to the connecting piece (11) on the other of the battery modules (100) via the third conductive member (27), and the protective seat (3) is provided at the connection between the third conductive member (27) and at least one of the connected connecting pieces (11).

8. The battery according to claim 7, characterized in that A third protective seat (35) is provided at the first end of the third conductive member (27), and a fourth protective seat (36) is provided at the second end of the third conductive member (27) away from the first end; The first end of the third conductive member (27) and the connecting piece (11) on an adjacent battery module (100) are mutually connected in the third protective seat (35) and fixed on a supporting surface (321) in the third protective seat (35); the second end of the third conductive member (27) and the connecting piece (11) on another adjacent battery module (100) are mutually connected in the fourth protective seat (36) and fixed on a supporting surface (321) in the fourth protective seat (36).

9. The battery according to claim 5, characterized in that The battery further comprises a BDU module (5), a discharge interface (6) and a charging interface (7); the first conductive member (25) and the second conductive member (26) are both electrically connected to the BDU module (5); the positive electrode and the negative electrode on the discharge interface (6) and the positive electrode and the negative electrode on the charging interface (7) are both electrically connected to the BDU module (5) via a hard metal member (8); and the outer wall of each of the hard metal members (8) is wrapped with a plastic-impregnated sleeve and mica paper in sequence.

10. An electrical device, characterized in that: A battery comprising any one of claims 1 to 9.

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