CN210074020U

CN210074020U - Cylindrical battery and battery module

Info

Publication number: CN210074020U
Application number: CN201822141419.5U
Authority: CN
Inventors: 许玉林; 龚晓冬; 王爱淑; 娄豫皖; 许袆凡
Original assignee: Suzhou Ankao Energy Co Ltd
Current assignee: Shanghai Qike Network Technology Co ltd
Priority date: 2018-12-20
Filing date: 2018-12-20
Publication date: 2020-02-14
Anticipated expiration: 2028-12-20

Abstract

The application discloses cylindrical battery and battery module, cylindrical battery includes: the battery shell is of a cylindrical structure with an open upper end; the inner core is accommodated in the battery shell; the battery cap is arranged at the opening of the upper end of the battery shell in a sealing way; the battery cap including fixed set up in this battery cap outer terminal surface department and with the electrically conductive end plate of the positive terminal of inner core or the electrically conductive connection of negative pole end, electrically conductive end plate deviates from the lateral surface of inner core is provided with can dismantle electrically conductive connection, be used for carrying out overcurrent or/and overheat protection's battery protection component to this battery with this electrically conductive end plate. The detachable battery protection element is arranged at the electrode end of the battery, when the abnormal conditions of current, voltage or over-high temperature occur in the process of electrifying the battery, the battery can be automatically disconnected from the circuit in time, and the battery protection element can be made into a standard part to be conveniently replaced.

Description

Cylindrical battery and battery module

Technical Field

The application relates to the field of batteries, in particular to a cylindrical battery and a battery module.

Background

As is well known, existing batteries, particularly cylindrical lithium ion batteries, generally comprise:

a battery case with one or two open ends,

an inner core accommodated in the battery case, and

an electrode cap (positive electrode cap or negative electrode cap) closed at the open end of the battery case.

Under the influence of the manufacturing process and the use requirement of the battery, the battery shell is usually in conductive connection with the negative electrode of the inner core, namely the battery shell is the negative electrode output end of the battery, the electrode cap at one open end of the battery shell is usually the positive electrode output end of the battery connected with the positive electrode of the inner core (if the battery shell is in a structure with two open ends, the electrode cap at one end is the negative electrode cap in conductive connection with the battery shell, and the other end is the positive electrode cap; if the battery shell is in a structure with a bottom cylinder with only one open end and the other closed end, the closed end is in conductive connection with the negative electrode of the inner core, and the electrode cap at the open end is the positive electrode cap. It is also contemplated that the positive electrode of the core may be conductively connected to the battery housing and the negative electrode of the core may be conductively connected to the open-ended electrode cap.

In order to prevent the short circuit of the positive electrode and the negative electrode of the battery, when the positive electrode cap is assembled, a sealing ring made of an insulating material is required to be clamped between the positive electrode cap and the battery shell, the sealing ring and the positive electrode cap are pressed and fixed together in a mechanical rolling manner. The sealing ring has the functions of insulating and isolating the battery shell and the positive electrode cap and has the sealing function of preventing electrolyte from overflowing between the battery shell and the positive electrode cap.

However, in the above-mentioned conventional mechanical sealed battery, the battery case, the sealing ring and the positive cap all rely on the inward concave deformation of the battery case to extrude the inner side sealing ring and the positive cap to realize sealing, and the battery case made of metal has certain plasticity, and is inevitably subjected to the radially outward extrusion force of the inner side sealing ring and the positive cap for a long time, so that the radially outward rebound deformation can occur, thereby reducing the radially extrusion force on the sealing ring, resulting in the problem of internal electrolyte leakage due to loose sealing. In addition, in the manufacturing process of the battery with the structure, when radial inward mechanical rolling pressure is applied to the battery shell, the inner positive electrode cap and the sealing ring can apply radial outward reaction force to the battery shell, so that the inward deformation of the battery shell due to rolling is rebounded, and an ideal sealing effect cannot be achieved.

Disclosure of Invention

The purpose of the application is: to the above-mentioned problem, provide a cylindrical battery and battery module, this kind of shape battery electrode end is provided with detachable battery protection component, when the battery current or the too high abnormal condition of temperature appear in the in-process of circular telegram operation, can be automatic in time break off the battery from the circuit, and battery protection component can make the convenient change of standard component moreover.

The technical scheme of the application is as follows:

a cylindrical battery comprising:

the battery shell is of a cylindrical structure with an open upper end;

the inner core is accommodated in the battery shell; and

a battery cap, which is arranged at the opening of the upper end of the battery shell in a closed manner, and is provided with an inner end surface facing the inner core and an outer end surface facing away from the inner core;

the battery cap including fixed set up in this battery cap outer terminal surface department and with the electrically conductive end plate of the positive terminal of inner core or the electrically conductive connection of negative pole end, electrically conductive end plate deviates from the lateral surface of inner core is provided with can dismantle electrically conductive connection, be used for carrying out overcurrent or/and overheat protection's battery protection component to this battery with this electrically conductive end plate.

On the basis of the technical scheme, the cylindrical battery also comprises the following preferable scheme:

the battery protection element includes:

a housing, and

the circuit board is fixed in the shell and is provided with a current protection circuit or/and a temperature protection circuit;

the shell comprises a first conductive part facing the conductive end plate and a second conductive part deviating from the conductive end plate, the circuit board is connected in series between the first conductive part and the second conductive part, and the first conductive part is detachably and conductively connected with the conductive end plate.

The conductive end plate is made of metal, the first conductive part comprises at least one pin, and the pin is fixed with the conductive end plate through laser welding.

The conductive end plate is made of metal, an inwards-concave threaded blind hole is formed in the outer side face, facing the battery protection element, of the conductive end plate, and the first conductive part is detachably and conductively connected with the conductive end plate through a screw locked in the threaded blind hole.

The first conductive part comprises three pins corresponding to the three threaded blind holes respectively, and the screw penetrates through the pins and is locked into the threaded blind holes.

The first conductive part comprises a threaded column extending towards the conductive end plate, an inward-concave threaded blind hole is formed in the outer side surface of the conductive end plate, and the threaded column is locked into the threaded blind hole.

The casing orientation the inside portion of electrically conductive end plate is open structure, electrically conductive end plate orientation battery protection component's lateral surface system has inside sunken cavity, the circuit board embedding in the cavity.

The battery cap further includes:

the metal cover plate is circular, the outer edge of the metal cover plate is welded and fixed with the upper end open edge of the battery case, and three first through holes which are distributed in a triangular shape are formed in the metal cover plate;

the three sealing sleeves are respectively arranged in the first through holes in a penetrating mode;

the inner sealing gasket is attached to the inner side of the metal cover plate, three second through holes are formed in the inner sealing gasket, and the lower ends of the three sealing sleeves respectively extend into the three second through holes;

the outer sealing gasket is attached to the outer side of the metal cover plate, three third through holes are formed in the outer sealing gasket, and the upper ends of the three sealing gaskets respectively extend into the three third through holes; and

and the three metal rivets are respectively arranged in the three seal sleeves in a penetrating manner, the metal cover plate, the inner seal gasket, the outer seal gasket and the conductive end plate are riveted and fixed together, and the anode or the cathode of the inner core is connected with the metal rivets through a conductor.

A battery module, comprising:

the battery clamp is provided with a battery inserting hole which is communicated up and down;

the battery series connection piece is embedded in the battery insertion hole; and

the upper-layer battery and the lower-layer battery are respectively arranged on the upper side and the lower side of the battery clamp, the negative electrode end/positive electrode end of the upper-layer battery is inserted into the battery insertion hole from the upper orifice of the battery insertion hole and is electrically connected with the battery series sheet, and the positive electrode end/negative electrode end of the lower-layer battery is inserted into the battery insertion hole from the lower orifice of the battery insertion hole and is electrically connected with the battery series sheet;

the lower layer battery adopts the structure of the cylindrical battery, and the battery protection element on the lower layer battery is connected in series between the conductive end plate and the battery series connection piece.

Preferably, the battery protection element is welded and fixed with the battery series connection piece; the upper layer battery also adopts the structure of the cylindrical battery, and the battery protection element on the upper layer battery is arranged at the upper end of the upper layer battery.

The application has the advantages that:

1. this kind of cylindrical battery of this application has held a battery protection component that can dismantle at positive terminal or negative pole end external connection, when this battery access circuit to consumer supplied power, if appear during the extreme electric current of battery or the high abnormal conditions of temperature, battery protection component can the broken circuit, guarantees the power consumption safety.

2. The battery protection element is arranged outside the battery but not inside the battery, so that the heat dissipation performance is better, and the service life of the battery is long.

3. The battery protection element is arranged outside the battery and is detachably connected with the battery body, and when the battery protection element is damaged or loses efficacy, the battery protection element can be easily detached and replaced, so that the battery is convenient to maintain.

4. The battery protection element consists of a shell and a circuit board fixed in the shell, and can be made into a standard component to replace the damaged or failed battery protection element on the old battery at any time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is an exploded schematic view of a cylindrical battery according to an embodiment of the present disclosure;

fig. 2 is a second exploded schematic view of a cylindrical battery according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a cylindrical battery according to an embodiment of the present invention;

FIG. 4 is an enlarged view of the portion X of FIG. 3;

fig. 5 is an exploded schematic view of a cylindrical battery according to a second embodiment of the present application;

fig. 6 is a schematic structural diagram of a battery module according to a third embodiment of the present application;

wherein: a-an upper battery, B-a lower battery, 1-a battery shell, 2-a battery clamp, 201-a battery insertion hole, 3-a conductive end plate, 301-a cavity, 302-a threaded blind hole, 4-a battery protection element, 401-a shell, 401 a-a first conductive part, 401B-a second conductive part, 402-a circuit board, 5-a metal cover plate, 501-a first through hole, 6-a sealing sleeve, 7-an inner sealing gasket, 701-a second through hole, 8-an outer sealing gasket, 801-a third through hole, 9-a metal rivet and 10-a battery series sheet.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.

One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.

Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

The first embodiment is as follows: cylindrical battery

Fig. 1 to 4 show a specific embodiment of such a cylindrical battery of the present application, which also includes, as in the case of a conventional cylindrical battery: the battery comprises a cylindrical battery case 1 with an open structure at the upper end and the lower end, an inner core (a winding core) accommodated in the battery case, and a positive electrode cap and a negative electrode cap which are respectively arranged at the upper open end and the lower open end of the battery case 1 in a sealing manner. The positive electrode cap is electrically connected with the positive electrode of the inner core and is arranged at the opening of the upper end of the battery shell 18; the negative electrode cap is electrically connected with the negative electrode of the inner core and is arranged at the lower end opening of the battery shell 1. And the negative electrode cap is directly welded and fixed with the battery shell 1, and the negative electrode cap and the battery shell 1 are electrically connected, so that the battery shell 1 is also the negative electrode output end of the battery besides the negative electrode cap. Obviously, the positive electrode cap and the negative electrode cap are both the battery cap of the battery.

It should be noted that some cylindrical batteries have a battery case with a bottomed cylindrical structure having only one end open and the other end closed, and such batteries need only be provided with a battery end cap at the open end.

The key improvement of this embodiment is that the positive electrode cap includes a conductive end plate 3 fixedly disposed on an outer end surface of the positive electrode cap, and the conductive end plate is conductively connected to the positive electrode end of the inner core. The outer side surface of the conductive end plate 3, which is far away from the inner core, is fixedly provided with a battery protection element 4, and the battery protection element is detachably and electrically connected with the conductive end plate 3 and is used for performing overcurrent protection or/and overheat protection on the battery. In the present embodiment, the battery protection element 4 has both overcurrent and overheat protection functions for the battery.

The battery protection element 4 specifically includes a case 401 and a circuit board 402, wherein the circuit board 402 is fixed in the case 401, and a current protection circuit and a temperature protection circuit are integrated on the circuit board 402.

The current protection circuit and the temperature protection circuit can adopt various structural forms, and are very common in the field of electricity, such as a PTC element, and the specific circuit structure does not relate to the design point of the application, so that the detailed description is omitted.

Further, case 401 includes first conductive portion 401a facing conductive end plate 3 and second conductive portion 401b facing away from conductive end plate 3, and first conductive portion 401a and second conductive portion 401b are insulated and separated from each other without being directly connected. The wiring board 402 is connected in series between the first conductive part 401a and the second conductive part 401 b. The portion of the battery protection element 4 detachably conductively connected to the conductive end plate 3 is specifically the first conductive portion 401 a.

When the cylindrical battery access electric equipment supplies power to the electric equipment, the current in the inner core flows to the conductive end plate 3, the first conductive part 401a, the circuit board with the protection circuit 402, and the second conductive part 401b in this order, and then flows to the electric equipment. Once the protection circuitry on the circuit board 402 senses an excessive current or temperature, the protection circuitry on the circuit board 402 quickly opens the power supply circuit of the battery, specifically the circuit between the first conductive portion 401a and the second conductive portion 401 b.

The conductive end plate 3 is made of metal, preferably aluminum. The first conductive part 401a includes three pins distributed in an equilateral triangle, and each pin is fixed to the conductive end plate 3 by laser welding. When the battery protection element 4 is damaged and needs to be replaced, the welding part of the pin and the conductive end plate 3 can be cut by laser, so that the battery protection element 4 can be detached from the conductive end plate 3. The aforementioned connection by "laser welding" can therefore also be understood as a detachable connection.

In order to reduce the size of the battery, the present embodiment provides an open structure on the inner side of the casing 401 facing the conductive end plate 3, and forms an inwardly recessed cavity 301 on the outer side of the conductive end plate 3 facing the battery protection element 4, and the circuit board 402 (a part of the circuit board) is embedded in the cavity 301.

The battery cap comprises the conductive end plate 3, a metal cover plate 5, a sealing sleeve 6, an inner sealing gasket 7, an outer sealing gasket 8 and a metal rivet 9. Wherein:

the metal cover plate 5 is circular, the outer edge of the metal cover plate 5 is welded and fixed with the upper open edge of the battery case 1 in a sealing manner, and three first through holes 501 distributed in an equilateral triangle shape are formed in the metal cover plate 5.

The number of the sealing sleeves 6 is three, and the three sealing sleeves 6 are respectively arranged in the three first through holes 501 in a penetrating manner.

The inner seal gasket 7 is arranged on the inner side of the metal cover plate 5 in an attached manner, three second through holes 701 distributed in an equilateral triangle shape are formed in the inner seal gasket 7, and the lower end portions of the three seal sleeves 6 respectively extend into the three second through holes 701.

The outer sealing gasket 8 is arranged on the outer side of the metal cover plate 5 in an abutting mode, three third through holes 801 distributed in an equilateral triangle mode are formed in the outer sealing gasket 8, and the upper ends of the three sealing sleeves 6 respectively extend into the three third through holes 801.

The metal rivets 9 are arranged in three, the three metal rivets 9 are respectively arranged in the three sealing sleeves 6 in a penetrating way, and the metal cover plate 5, the inner sealing gasket 7, the outer sealing gasket 8 and the conductive end plate 3 are riveted and fixed together along the axial direction of the battery case. The positive pole of the inner core is connected with the metal rivet 9 through a conductor (tab).

It can be seen that the inner seal 7, the outer seal 8 and the seal sleeve 6 are tightly attached to the corresponding battery components under the riveting action of the metal rivet 9, so as to insulate and separate the metal cover plate 5 connected with the negative electrode of the battery, the metal rivet 9 connected with the positive electrode of the battery and the conductive end plate 3, and form a seal to prevent the electrolyte from overflowing from the vicinity of the seal sleeve 6.

Example two: cylindrical battery

Fig. 5 shows another embodiment of the cylindrical battery of the present application, which is similar in structure to the cylindrical battery of the first embodiment described above, with the only difference that:

in this embodiment, first conductive part 401a of the case of battery protection element 4 is not welded to conductive end plate 3, but screwed to conductive end plate 3 by screw 11.

Specifically, the outer side surface of the conductive end plate 3 (i.e., the side facing the battery protection element 4) is provided with three threaded blind holes 302 distributed in an equilateral triangle. The first conductive part 401a of the housing 401 also includes three pins distributed in an equilateral triangle shape in the first embodiment, the three pins are respectively disposed in the three threaded blind holes, and the screws 11 (three in total) are inserted through the three pins and locked into the threaded blind holes.

When the battery protection element 4 is damaged or fails and needs to be replaced, the above-described screws are turned on, thereby detaching the battery protection element 4 from the conductive end plate 3.

Of course, a threaded post may be directly integrally disposed on the first conductive portion 401a of the housing, a threaded blind hole recessed inwards and corresponding to the threaded post is formed on the outer side surface of the conductive end plate 3, and the threaded post is locked into the threaded blind hole, so as to detachably connect the battery protection element 4 and the conductive end plate 3.

Example three: battery module

Fig. 6 shows one specific embodiment of such a battery module of the present application. The module also includes a battery holder 2, a battery series piece 10, an upper layer battery a, and a lower layer battery B, as in the conventional battery module.

Wherein:

the battery holder 2 (also referred to as a battery holder) is made of an insulating plastic material and has a substantially rectangular shape, and the battery holder 2 is provided with a battery insertion hole 201 that penetrates vertically. The battery cartridge hole 201 has an upper orifice and a lower orifice facing away from each other.

The battery series connection piece 10 is a commonly used eight-claw spring plate made of steel or aluminum, and is composed of a round bottom plate and eight spring claws arranged on the periphery of the bottom plate, and the battery series connection piece 10 is embedded in the battery insertion hole 201.

The upper layer battery A and the lower layer battery B are respectively arranged at the upper side and the lower side of the battery clamp 2. The negative end of the upper battery A is inserted into the battery insertion hole 201 from the upper orifice and is electrically connected with the battery series sheet 10, and the positive end of the lower battery B is inserted into the battery insertion hole 201 from the lower orifice and is electrically connected with the battery series sheet 10. The series connection of the upper layer cell a and the lower layer cell B is thus achieved by means of the cell series sheet 10. Further, the upper cells a are connected in parallel via a parallel network not shown in the drawing, and the lower cells B are also connected in parallel.

The upper cells a are connected in parallel via a parallel network, not shown, and the lower cells B are also connected in parallel.

The key improvement of this embodiment is that the lower layer battery B has the same structure as the cylindrical battery of the first embodiment (or the second embodiment). The cell protection members 4 on the lower cells B are connected in series between the conductive end plates 3 and the cell series sheets 2.

Further, second conductive part 401b of case 401 of battery protection element 4 is welded and fixed to the bottom plate of battery serial sheet 2. And the lower end (negative end) of the upper battery a is surrounded and clamped by eight elastic claws on the battery series connection piece 10.

The same as the conventional battery module design is: in order to improve the structural stability of the battery module, a circle of inner flange protruding radially inwards is formed on the hole wall of the axial middle part of the battery insertion hole 201, and the battery series connection piece 10 and the lower layer battery B are respectively positioned on the upper side and the lower side of the inner flange and are welded and fixed. Specifically, the second conductive part of the upper case 601 of the lower cell B is welded and fixed to the bottom plate of the cell serial sheet.

If an overcurrent or overheat fault occurs in a certain lower battery B in fig. 6, the battery protection element 4 therein acts to cut off the electrical connection between the positive terminal thereof and the battery series connection piece 10, so that the battery is isolated from the power supply circuit alone and no longer supplies power to the outside, and the rest batteries still supply power to operate normally.

In consideration of the fact that in practical use, a battery holder 2 is generally further mounted on the upper end (i.e., the positive terminal) of the upper-layer battery a, thereby assembling a larger-capacity battery module. In order to make the upper battery a have separate overcurrent and overheat protection functions, it is preferable that the upper battery a also adopts the cylindrical battery structure described in the first embodiment (or the second embodiment). In this case, the battery protection element 4 on the upper layer battery a is located at the upper end of the upper layer battery a (i.e., the end facing away from the battery series sheet 10 in fig. 6).

Obviously, in fig. 6, the upper end of the lower cell B may be the negative electrode, and correspondingly, the lower end of the upper cell a may be the positive electrode. That is, the battery protection element 4 may be connected in series to the negative terminal of the battery instead of the positive terminal in the first and second embodiments.

It should be noted that some battery modules have only one battery layer, i.e. the batteries are arranged on only one side of the battery holder, and the batteries are coupled to each other purely in parallel. Some battery modules are constructed with multiple layers of cells, each having only one cell, which are coupled to each other purely in series.

The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.

Claims

1. A cylindrical battery comprising:

the battery shell (1), the said battery shell (1) is the open cylindrical structure of upper end;

the inner core is accommodated in the battery shell (1); and

a battery cap which is arranged at the opening of the upper end of the battery shell (1) in a closed mode and is provided with an inner end face facing the inner core and an outer end face deviating from the inner core;

the battery cap is characterized by comprising a conductive end plate (3) fixedly arranged on the outer end face of the battery cap and electrically connected with the positive end or the negative end of the inner core, wherein the conductive end plate (3) deviates from the outer side face of the inner core, and a battery protection element (4) which is detachably and electrically connected with the conductive end plate (3) and used for overcurrent or/and overheat protection of the battery is arranged on the outer side face of the inner core.

2. The cylindrical battery according to claim 1, wherein the battery protection member (4) comprises:

a housing (401), and

a circuit board (402) fixed in the shell (401) and provided with a current protection circuit or/and a temperature protection circuit;

the shell (401) comprises a first conductive part (401a) facing the conductive end plate (3) and a second conductive part (401b) facing away from the conductive end plate (3), the circuit board (402) is connected in series between the first conductive part (401a) and the second conductive part (401b), and the first conductive part (401a) is detachably and conductively connected with the conductive end plate (3).

3. The cylindrical battery according to claim 2, wherein the conductive end plate (3) is made of a metal material, and the first conductive part (401a) comprises at least one pin, and the pin is fixed to the conductive end plate (3) by laser welding.

4. The cylindrical battery according to claim 2, wherein the conductive end plate (3) is made of a metal material, and an outer side surface of the conductive end plate (3) facing the battery protection element (4) is formed with an inwardly recessed threaded blind hole, and the first conductive portion (401a) is detachably and electrically connected to the conductive end plate (3) by means of a screw locked into the threaded blind hole.

5. The cylindrical battery according to claim 4, wherein there are three blind threaded holes, and the three blind threaded holes are distributed in an equilateral triangle, and the first conductive part (401a) includes three pins corresponding to the three blind threaded holes, respectively, through which the screw is locked into the blind threaded holes.

6. The cylindrical battery according to claim 2, wherein the first conductive portion (401a) comprises a threaded post extending in the direction of the conductive end plate (3), and the outer side surface of the conductive end plate (3) is formed with an inwardly recessed threaded blind hole into which the threaded post is locked.

7. The cylindrical battery according to any one of claims 2 to 6, wherein the inner side of the casing (401) facing the conductive end plate (3) is open, the outer side of the conductive end plate (3) facing the battery protection element (4) is provided with an inwardly recessed cavity (301), and the circuit board (402) is embedded in the cavity (301).

8. The cylindrical battery according to claim 1, wherein the battery cap further comprises:

the battery case comprises a metal cover plate (5), wherein the metal cover plate (5) is circular, the outer edge of the metal cover plate is welded and fixed with an upper open edge of the battery case (1), and three first through holes (501) distributed in a triangular shape are formed in the metal cover plate (5);

three sealing sleeves (6), and the three sealing sleeves (6) are respectively arranged in the first through holes (501) in a penetrating manner;

the inner sealing gasket (7) is attached to the inner side of the metal cover plate (5), three second through holes (701) are formed in the inner sealing gasket (7), and the lower ends of the three sealing sleeves (6) extend into the three second through holes (701) respectively;

the outer sealing gasket (8) is attached to the outer side of the metal cover plate (5), three third through holes (801) are formed in the outer sealing gasket (8), and the upper ends of the three sealing sleeves (6) extend into the three third through holes (801) respectively; and

the three metal rivets (9) are respectively arranged in the three seal sleeves (6) in a penetrating mode, the metal cover plate (5), the inner sealing gasket (7), the outer sealing gasket (8) and the conductive end plate (3) are fixedly riveted together, and the positive pole or the negative pole of the inner core is connected with the metal rivets (9) through conductors.

9. A battery module, comprising:

the battery clamp (2), wherein the battery clamp (2) is provided with a battery inserting hole (201) which is communicated up and down;

the battery series connection piece (10), the battery series connection piece (10) is embedded in the battery insertion hole (201); and

the upper-layer battery (A) and the lower-layer battery (B) are respectively arranged on the upper side and the lower side of the battery clamp (2), the negative end/positive end of the upper-layer battery (A) is inserted into the battery insertion hole (201) from the upper orifice of the battery insertion hole (201) and is in conductive connection with the battery serial sheet (10), and the positive end/negative end of the lower-layer battery (B) is inserted into the battery insertion hole (201) from the lower orifice of the battery insertion hole (201) and is in conductive connection with the battery serial sheet (10);

characterized in that the lower cell (B) adopts the cylindrical cell structure according to any one of claims 1 to 8, and the cell protection element (4) on the lower cell (B) is connected in series between the conductive end plate (3) and the cell series connection sheet (10).

10. The battery module according to claim 9, wherein the battery protection member (4) is welded and fixed to the battery series connection tab (10); the upper layer battery (a) also adopts the structure of the cylindrical battery as defined in any one of claims 1 to 8, and the battery protection element (4) on the upper layer battery (a) is provided at the upper end of the upper layer battery (a).