Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer which comprises a pole and a contact finger, and the pole is provided with a groove; the contact finger is arranged in the groove, the outer wall of the contact finger abuts against the inner wall of the groove, and at least part of the inner wall of the contact finger abuts against the electric connecting piece; the contact finger comprises a first connecting part, a contact finger sheet and a second connecting part which are sequentially connected along the axial direction; at least part of at least one of the first connecting part and the second connecting part is bent in the radial direction to form a bent part. Therefore, laser welding and screw connection are not needed in the connecting process of the pole and the contact finger in the battery monomer, and the connecting part of the contact finger comprises the bending part, so that the structural strength of the connecting part can be improved, and the axial size of the non-bending part area of the connecting part can be reduced as much as possible.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, concretely relates to a battery monomer, a battery provided with the battery monomer and an electric device provided with the battery. BACKGROUND

[0002] Electric vehicles are loved by people because of their simple structure, low noise and little pollution to the environment. The endurance time of electric vehicles is one of the focuses of people. One of the key factors affecting the endurance time of electric vehicles is the capacity of the battery pack carried by the electric vehicles. In order to enable electric vehicles to have more lasting endurance, the number of batteries in the battery pack is increasing.

[0003] In the prior art battery pack, the electrical connection between the pole posts of the series and / or parallel single batteries and the corresponding conductive contact finger pieces is usually realized by laser welding or screw connection. Once laser welding fails or screw connection loosens, it will affect the battery internal resistance and safety, and the battery pack will be scrapped with high probability. UTILITY MODEL CONTENTS

[0004] Therefore, the purpose of the utility model is to provide a battery monomer, which can solve the problems of electrical connection failure between pole posts caused by laser welding and screw connection loosening.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A battery monomer comprises:

[0007] A pole post is provided with a groove.

[0008] A contact finger is arranged in the groove, the outer wall of the contact finger abuts against the inner wall of the groove, and at least part of the inner wall of the contact finger is used for abutting against an electrical connecting piece; the contact finger comprises a first connecting part, a contact finger piece and a second connecting part connected in sequence along an axial direction.

[0009] At least part of at least one of the first connecting part and the second connecting part is radially bent to form a bent part.

[0010] Optionally, in the above battery monomer, the groove comprises a first hole section and a second hole section in sequence from outside to inside along the axial direction.

[0011] At least part of the first connecting part is radially bent outward to form the bent part.

[0012] Wherein:

[0013] The first hole section and the second hole section have equal diameters, the bending part protrudes along the axial direction from the pole column; the contact finger piece abuts against the inner wall of the first hole section and the second hole section;

[0014] Alternatively, the first hole section has a larger diameter than the second hole section, the first connecting part is located in the first hole section, and the contact finger piece abuts against the inner wall of the second hole section.

[0015] Optionally, in the battery monomer, the groove comprises, along the axial direction, a first hole section, a second hole section, and a third hole section in sequence from outside to inside;

[0016] Wherein:

[0017] At least part of the second connecting part is bent radially outward to form the bending part, the second hole section has a smaller diameter than the third hole section, and the second connecting part is located in the third hole section;

[0018] Alternatively, at least part of the second connecting part is bent radially inward to form the bending part, the second hole section has a diameter equal to that of the third hole section, and the second connecting part is located in the third hole section.

[0019] Optionally, in the battery monomer, the size of the bending part along the axial direction is not less than 0.2 mm and not greater than 0.8 mm.

[0020] Optionally, in the battery monomer, the size of the bending part along its bending direction is not less than 0.5 mm and not greater than 3 mm.

[0021] Optionally, in the battery monomer, the angle between the bending direction of the bending part and the axial direction is b, and 80°≤b≤120°; preferably, 85°≤b≤95°.

[0022] Optionally, in the battery monomer, a plurality of contact finger pieces are arranged along the circumference of the contact finger, the contact finger piece is an arc-shaped structure, and the outer contour of the projection of the contact finger piece along the axial direction abuts against the inner wall of the second hole section.

[0023] Optionally, in the battery monomer, the contact finger piece has a first side surface and a second side surface from outside to inside along the radial direction;

[0024] The first side surface has a first needle part protruding from the first side surface; the first needle part abuts against the second hole section;

[0025] And / or, the second side surface has a second needle part protruding from the second side surface, and the second needle part can abut against the electrical connecting part.

[0026] A battery comprises:

[0027] a plurality of the above-mentioned battery monomers;

[0028] an electrical connector, poles of two adjacent battery monomers are connected by the electrical connector, the electrical connector is partially protruded on one side close to the poles to form a protruding part, the protruding part is inserted into a groove of the poles respectively, and the protruding part at least abuts against a contact finger piece.

[0029] An electric device comprising the above-mentioned battery.

[0030] From the above technical solution, it can be seen that the utility model discloses a pole is provided with the recess for accommodating the contact finger, the inner wall of recess and the outer wall of contact finger abut, the protruding part of electrical connector and contact finger abut to realize electrical connection, that is, the electrical connection between different battery monomers can be realized through the contact finger and electrical connector of different battery monomers, and the connection process does not need to use laser welding and screw connection, which can improve the safety of battery. And the connecting part of contact finger includes the bending part, which can improve the structural strength of connecting part and can reduce the size of non-bending area of connecting part along the axial direction as far as possible, in the case that the size of contact finger along the axial direction is certain, the size of connecting part along the axial direction is small, which can make the size of contact finger piece as large as possible, increase the contact area of contact finger piece and inner wall of recess, reduce the contact resistance and increase the overcurrent capacity of contact finger piece. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0032] Figure 1 The structure diagram of the contact finger provided by the embodiment of the utility model Figure 1 ;

[0033] Figure 2 The structure diagram of the contact finger provided by the embodiment of the utility model Figure 2 ;

[0034] Figure 3 The partial sectional view of the contact finger provided by the embodiment of the utility model;

[0035] Figure 4 The sectional view of the pole provided by the embodiment of the utility model Figure 1 ;

[0036] Figure 2 The sectional view of the pole provided by the embodiment of the utility model Figure 6 ;

[0037] Figure 7 A structure schematic view of the electric connector provided by the embodiment of the utility model is provided.

[0038] Figures 1 to 7 A structure schematic view of the battery provided by the embodiment of the utility model is provided.

[0039] Among them:

[0040] 1, pole; 11, groove; 12, first hole section; 13, second hole section; 14, third hole section;

[0041] 2, contact finger; 21, first connecting part; 22, contact finger piece; 23, second connecting part; 24, bending part;

[0042] 3, electric connector; 31, protruding part. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0044] In the description of the utility model, it should be explained that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0045] As Figure 4 shown, the embodiment of the utility model provides a kind of battery monomer, can solve the problem that the electric connection between pole 1 is invalid caused by laser welding and screw connection is prone to looseness.

[0046] Firstly, the battery monomer comprises a pole 1 and a contact finger 2, wherein the pole 1 is provided with a groove 11; the contact finger 2 is arranged in the groove 11, the outer wall of the contact finger 2 abuts against the inner wall of the groove 11, and at least part of the inner wall of the contact finger 2 is used to abut against the electrical connector 3, that is, part of the inner wall of the contact finger 2 abuts against the electrical connector 3; or all of the inner wall of the contact finger 2 abuts against the electrical connector 3; the contact finger 2 comprises a first connecting part 21, a contact finger sheet 22 and a second connecting part 23 connected in sequence in the axial direction; wherein at least part of at least one of the first connecting part 21 and the second connecting part 23 is radially bent to form a bent part 24. That is, the first connecting part 21 has part of the bent part 24 and part of the unbent part, and the second connecting part 23 does not have the bent part 24; or the first connecting part 21 has a bent part 24 along one circumference in the radial direction, and the second connecting part 23 does not have the bent part 24; or the first connecting part 21 does not have the bent part 24, and the second connecting part 23 has part of the bent part 24 and part of the unbent part; or the first connecting part 21 does not have the bent part 24, and the second connecting part 23 has a bent part 24 along one circumference in the radial direction; or the first connecting part 21 and the second connecting part 23 both have part of the bent part 24 and part of the unbent part; or the first connecting part 21 and the second connecting part 23 both have a bent part 24 along one circumference in the radial direction. It should be noted that when the bent part 24 is partially bent, the bent part 24 is uniformly arranged along the circumferential direction of the contact finger 2, but it is not limited thereto, and the specific arrangement of the bent part 24 can be designed according to actual needs by those skilled in the art. In addition, the bending direction of the bent part 24 can be inwardly bent in the radial direction, or outwardly bent in the radial direction. The contact finger 2 can connect the electrical connector 3, and the electrical connection between different battery monomers can be realized by connecting the electrical connector 3 through the respective contact fingers 2.

[0047] It can be seen that the utility model discloses a battery monomer's pole post 1 is provided with the recess 11 for accommodating the contact finger 2, and the inner wall of the recess 11 and the outer wall of the contact finger 2 abut, and the convex part 31 of the electric connecting piece 3 and the contact finger 2 abut to realize electric connection, that is, the electric connection between different battery monomers can be realized through the electric connection of the contact finger 2 and the electric connecting piece 3 of each battery monomer, and the connection process does not need to use laser welding and screw connection, and the safety of the battery can be improved. And the connecting part of the contact finger 2 includes the bending part 24, and the structure can improve the structural strength of the connecting part. Compared with the prior art, the battery monomers are electrically connected through the electric connecting piece 3, and specifically, the electric connecting piece 3 and the pole post 1 of the battery monomer are electrically connected through the contact finger 2, and the contact finger 2 includes the contact finger sheet 22 and the upper connecting part and the lower connecting part connecting the contact finger sheet 22. The connecting part can connect multiple contact finger sheets 22, and since the position of the contact finger sheet 22 in the pole post 1 needs to be ensured, the contact finger sheet 22 is prevented from being deflected and deformed, and the height of the connecting part cannot be too small. At present, the battery technology develops towards the direction of high energy density, and in order to reduce the cost of the pole post 1 and improve the space utilization, the thickness of the positive and negative pole posts 1 should be as small as possible, and since the upper connecting part and the lower connecting part exist, the height of the contact finger sheet 22 accounts for a small proportion of the total height, and the space of the pole post in the height direction is greatly wasted, for example, the total height of the contact finger 2 is 3.5mm, the upper and lower connecting parts are each 0.7mm high, and the contact finger sheet 22 is actually only 2.1mm, accounting for 60% of the total height. However, if the thickness of the pole post and the height of the contact finger are compressed at the same time, the contact area of the pole post and the contact finger 2 will be reduced, and the overcurrent capacity will be affected. The scheme can reduce the size of the non-bending area of the connecting part along the axial direction as much as possible, and under the condition that the size of the contact finger 2 along the axial direction is certain, the size of the connecting part along the axial direction is small, so that the size of the contact finger sheet 22 is as large as possible, the contact area of the contact finger sheet 22 and the inner wall of the recess 11 can be increased, the contact resistance can be reduced, and the overcurrent capacity of the contact finger sheet 22 can be increased.

[0048] In specific implementation, the groove 11 includes a first hole section 12 and a second hole section 13 in sequence from the outside to the inside along the axial direction; it should be noted that in the direction from the inside to the outside, the inside refers to the direction closer to the battery cell and the outside refers to the direction away from the battery cell. At least a portion of the first connecting portion 21 is bent radially outward to form a bent portion 24; the first hole segment 12 and the second hole segment 13 have equal diameters, and the bent portion 24 protrudes axially from the pole post 1; the finger piece 22 abuts against the inner walls of the first hole segment 12 and the second hole segment 13, and the force of the interaction between the two abuts enables the finger 2 to not detach from the groove 11 without external force; or, the diameter of the first hole segment 12 is larger than the diameter of the second hole segment 13, the first connecting portion 21 is located inside the first hole segment 12, so that the surface of the pole post 1 can be flush, or in other words, the first connecting portion 21 at least does not protrude from the pole post 1, the finger piece 22 abuts against the inner wall of the second hole segment 13, and the force of the interaction between the two abuts enables the finger 2 to not detach from the groove 11 without external force. It should be noted that at least a portion of the first connecting portion 21 is bent outward in the radial direction to form a bent portion 24; that is, the first connecting portion 21 has a bent portion 24 that is partially bent outward in the radial direction and a portion that is not bent; or, the first connecting portion 21 has a bent portion 24 that is bent outward in the radial direction for one circumference.

[0049] In specific implementation, the groove 11, from the outside to the inside along the axial direction, includes a first hole section 12, a second hole section 13, and a third hole section 14; wherein: see details Figure 5 At least a portion of the second connecting portion 23 is bent radially outward to form a bent portion 24. The diameter of the second hole segment 13 is smaller than the diameter of the third hole segment 14. The second connecting portion 23 is located within the third hole segment 14, which can prevent the contact finger 2 from dislodging from the pole post 1 under external force. It should be noted that at least a portion of the second connecting portion 23 is bent radially outward to form a bent portion 24; that is, the second connecting portion 23 has a partially bent portion 24 and a partially unbent portion; or, the second connecting portion 23 has a bent portion 24 that is radially circumferential and radially outward. The bent portion 24 of the second connecting portion 23 is difficult to insert into the third hole segment 14, and the third hole segment 14 on the pole post 1 is relatively difficult to process. Alternatively, see details. Figure 7 At least a portion of the second connecting portion 23 is bent radially inward to form a bent portion 24. The diameter of the second hole segment 13 is equal to the diameter of the third hole segment 14, and the second connecting portion 23 is located within the third hole segment 14. In this case, the third hole segment 14 is not needed to accommodate the bent portion 24 of the second connecting portion 23, facilitating the entry of the second connecting portion 23 into the groove 11. However, the finger 2 is more easily dislodged from the pole post 1 under external force. It should be noted that at least a portion of the second connecting portion 23 is bent radially inward to form the bent portion 24; that is, the second connecting portion 23 has a partially bent portion 24 and a partially unbent portion; or, the second connecting portion 23 has a bent portion 24 that is radially circumferential and radially inward.

[0050] In specific implementation, the size of the bending portion 24 along the axial direction is not less than 0.2 mm and not more than 0.8 mm. The size of the bending portion 24 along the axial direction can be any one of 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, etc. The size of the bending portion 24 along the axial direction not only avoids being too thin to deform easily and not good at fixing the contact finger piece 22, but also avoids being too thick to occupy too much height of the contact finger 2 and reduce the contact area of the contact finger piece 22 and the pole 1. However, the specific size of the bending portion 24 along the axial direction can be designed according to actual needs by those skilled in the art.

[0051] In specific implementation, the size of the bending portion 24 along the bending direction thereof is not less than 0.5 mm and not more than 3 mm. The size of the bending portion 24 along the bending direction thereof can be any one of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. The size of the bending portion 24 along the bending direction thereof not only avoids being too wide to cause design redundancy and waste of materials, but also avoids being too narrow to cause the contact finger piece 22 to deform and deviate easily. However, the specific size of the bending portion 24 along the bending direction thereof can be designed according to actual needs by those skilled in the art.

[0052] In specific implementation, the angle between the bending direction of the bending portion 24 and the axial direction is b, and 80°≤b≤120°, preferably 85°≤b≤95°. b can be any one of 85°, 90°, 95°, etc. The angle b not only avoids the bending portion 24 being broken due to small thickness when b is less than 85°, but also avoids the bending portion 24 occupying too much space in the height direction when b is greater than 95°.

[0053] In specific implementation, a plurality of contact finger pieces 22 are arranged along the circumferential direction of the contact finger 2. The contact finger piece 22 is an arc-shaped structure, but is not limited thereto. The contact finger piece 22 can also be a broken line type structure. The outer contour of the projection of the contact finger piece 22 along the axial direction abuts against the inner wall of the second hole segment 13. As long as the specific structure of the contact finger piece 22 can ensure abutting against the inner wall of the second hole segment 13, and the contact finger 2 can not be separated from the groove 11 by the interaction force generated between the two under the condition of no external force, the specific structure shape of the contact finger piece 22 and the number and arrangement form thereof can be designed according to actual needs by those skilled in the art.

[0054] In specific implementation, the contact finger piece 22 has a first side surface and a second side surface from the outside to the inside along the radial direction; the first side surface has a first needle portion protruding from the first side surface; the first needle portion abuts against the second hole segment 13; and

[0055] Or, the second side has a second needle part protruding from the second side, and the second needle part can abut against the first needle part to enhance the connection strength between the contact finger piece and the pole, and improve the current carrying capacity.

[0056] For details ​ The utility model embodiment provides a kind of battery, including multiple above-mentioned battery monomer and electric connector 3, and the pole 1 in adjacent two battery monomers is connected by electric connector 3, and electric connector 3 is locally protruding to form protruding part 31 on the side close to pole 1, protruding part 31 is inserted into the recess 11 of pole 1 respectively, protruding part 31 at least abuts against contact finger piece 22, and the abutment connection of both is realized electric connection, and abutment connection can avoid both to separate under no external force, and compared with welding, the connection form is more convenient and safe.Electric connector 3 connects two poles 1, so that the protruding part 31 on electric connector 3 also includes two, i.e.the pole 1 of two battery monomers needing electric connector 3 connection corresponds to respective protruding part 31.It needs to be explained that the pole 1 in adjacent two battery monomers can be pole 1 of different polarity also can be pole 1 of same polarity.In addition, the battery of multiple battery monomers and electric connector 3 composition can be battery pack also can be battery module.

[0057] It can be seen that the utility model embodiment provides the pole 1 of battery, is provided with the recess 11 for accommodating contact finger 2, the inner wall of recess 11 and the outer wall of contact finger 2 abut, and the protruding part 31 of electric connector 3 and contact finger 2 abut to realize electric connection, i.e.different battery monomers are connected by respective contact finger 2 and electric connector 3, and the electric connection between different battery monomers can be realized, and the connection process does not need to use laser welding and screw connection, and the safety of battery can be improved.And the connecting portion of contact finger 2 includes bending portion 24, which can improve the structural strength of the connecting portion, and can minimize the size of the non-bending area of the connecting portion along the axial direction.Under the condition that the size of contact finger 2 along the axial direction is constant, the size of the connecting portion along the axial direction is small, which can make the size of contact finger piece 22 as large as possible, increase the contact area of contact finger piece 22 and the inner wall of recess 11, reduce the contact resistance, and increase the overcurrent capacity of contact finger piece 22.

[0058] The utility model embodiment provides a kind of electric device, including above-mentioned battery.

[0059] The electric device is not particularly limited, and can include but is not limited to: a notebook computer, a pen input type computer, a mobile computer, an electronic book player, a portable telephone, a portable facsimile machine, a portable copying machine, a portable printer, a head-mounted stereo headphone, a video recorder, a liquid crystal television, a portable cleaner, a portable CD player, a mini disc, a transceiver, an electronic notepad, a calculator, a memory card, a portable recorder, a radio, a backup power supply, a motor, an automobile, a motorcycle, a power-assisted bicycle, a bicycle, an illuminating appliance, a toy, a game machine, a clock, a power tool, a flash light, a camera, a household large storage battery and a lithium ion capacitor, etc.

[0060] Finally, it should be noted that the terminology used herein, such as first and second, is merely used to differentiate one entity or operation from another entity or operation and does not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0061] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between various embodiments can be referred to each other.

[0062] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application should not be limited to the embodiments shown herein, but should be consistent with the widest scope of principles and novel features disclosed herein.

Claims

1. A battery cell, characterized by, Comprise: a pole column (1) provided with a groove (11); a contact finger (2) arranged in the groove (11), an outer wall of the contact finger (2) abutting against an inner wall of the groove (11), and at least part of an inner wall of the contact finger (2) being arranged to abut against an electrical connector (3); the contact finger (2) comprises, in sequence along an axial direction, a first connecting portion (21), a contact finger piece (22), and a second connecting portion (23); wherein at least part of at least one of the first connecting portion (21) and the second connecting portion (23) is bent radially to form a bent portion (24).

2. The battery cell of claim 1, wherein, The groove (11) comprises, in sequence along the axial direction from outside to inside, a first hole section (12), a second hole section (13); At least part of the first connecting portion (21) is bent radially outward to form the bent portion (24); wherein: the first hole section (12) and the second hole section (13) have equal diameters, the bent portion (24) protrudes from the pole column (1) along the axial direction, and the contact finger piece (22) abuts against the inner walls of the first hole section (12) and the second hole section (13); or, the diameter of the first hole section (12) is greater than the diameter of the second hole section (13), the first connecting portion (21) is located in the first hole section (12), and the contact finger piece (22) abuts against the inner wall of the second hole section (13).

3. The battery cell according to claim 1 or 2, characterized in that, The groove (11) comprises, in sequence along the axial direction from outside to inside, a first hole section (12), a second hole section (13), and a third hole section (14); wherein: at least part of the second connecting portion (23) is bent radially outward to form the bent portion (24), the diameter of the second hole section (13) is smaller than the diameter of the third hole section (14), and the second connecting portion (23) is located in the third hole section (14); or, at least part of the second connecting portion (23) is bent radially inward to form the bent portion (24), the diameter of the second hole section (13) is equal to the diameter of the third hole section (14), and the second connecting portion (23) is located in the third hole section (14).

4. The battery cell of claim 1, wherein, The size of the bent portion (24) along the axial direction is not less than 0.2 mm and not more than 0.8 mm.

5. The battery cell of claim 1, wherein, The size of the bent portion (24) along its bending direction is not less than 0.5 mm and not more than 3 mm.

6. The battery cell of claim 1, wherein, The angle between the bending direction of the bent portion (24) and the axial direction is b, and 80°≤b≤120°.

7. The battery cell of claim 6, wherein, 85°≤b≤95°。 8. The battery cell of claim 3, wherein, A plurality of contact finger pieces (22) are arranged along the circumference of the contact finger (2), the contact finger piece (22) is an arc-shaped structure, and the outer contour of the projection of the contact finger piece (22) along the axial direction abuts against the inner wall of the second hole section (13).

9. The battery cell of claim 3, wherein, The contact finger piece (22) has a first side and a second side from outside to inside along the radial direction; the first side has a first needle portion protruding from the first side, and the first needle portion abuts against the second hole section (13); and / or, the second side has a second needle portion protruding from the second side, and the second needle portion can abut against the electrical connector (3).

10. A battery, characterized by Comprise: A plurality of the battery cell according to any one of claims 1-9; An electrical connector (3) is used to connect the pole posts (1) of two adjacent battery cells, the electrical connector (3) is partially protruded to form a protruding part (31) near one side of the pole post (1), the protruding part (31) is inserted into the groove (11) of the pole post (1) respectively, and the protruding part (31) at least abuts against the contact finger (22).

11. An electrical device, characterized by The battery according to claim 10.

Images