Cylindrical battery with built-in protection plate

Abstract

The utility model provides a cylindrical battery with a built-in protection plate, the cylindrical battery comprises a shell part, a battery cell, a CID explosion-proof part and a control part, the bottom of the CID explosion-proof part is connected with the positive electrode of the battery cell, and the edge position of the upper surface of the CID explosion-proof part is provided with an annular bulge; the control part comprises a protection plate and a conduction body, the conduction body is annularly arranged at the edge of the protection plate, an upper conduction area and a lower conduction area are respectively formed on the conduction body at the edge positions of the upper surface and the lower surface of the protection plate, the annular bulge is propped against the lower conduction area, the positive electrode cover is connected to the upper surface of the protection plate, and the shell is connected to the upper conduction area, so that the upper conduction area is connected with the negative electrode of the battery cell. Through the arrangement of the conducting body, a wire does not need to be additionally arranged in the battery to connect the battery cell and the protection plate, the internal structure of the battery is simplified, the internal integration degree of the battery is improved, and meanwhile, when the battery is produced and assembled, the conducting body is used for replacing a traditional wire connection structure, so that the wiring process of the wire is saved, and the production efficiency is improved. And automatic production and assembly of the battery are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, specifically, relate to a cylindrical battery with built-in protection plate. BACKGROUND

[0002] The cylindrical battery is a kind of battery with high capacity, long cycle life and wide use environment temperature, which can be applied to intelligent door lock, electric tool and toy model.

[0003] The existing cylindrical battery is usually provided with explosion-proof valve for quickly releasing gas and internal pressure when the battery pressure abnormally rises due to overcharge, short circuit or thermal runaway, to prevent the battery from violent expansion, explosion or fire, and in order to monitor voltage, current and temperature in real time, further prevent overcharge, overdischarge, short circuit or overcurrent and other abnormal conditions, battery protection plate is usually additionally installed on the battery cell, which leads to the overall volume of the existing cylindrical battery being relatively large, and the internal integration degree being low, and the battery protection plate and the battery cell also need to be connected by additional wires, which makes it difficult to realize the automatic production of the battery. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a cylindrical battery with built-in protection plate.

[0005] The cylindrical battery with built-in protection plate disclosed in the present application comprises a shell member, a battery cell, a CID explosion-proof member and a control member; the shell member comprises an outer shell and a positive cover arranged at one end of the outer shell; the battery cell is arranged in the outer shell, and has a positive electrode and a negative electrode, and the negative electrode of the battery cell is in contact with the bottom of the outer shell; the CID explosion-proof member is arranged in the outer shell, and the bottom of the CID explosion-proof member is connected with the positive electrode of the battery cell, and the edge position of the upper surface of the CID explosion-proof member has an annular protrusion; the control member comprises a protection plate and a conductive body, the conductive body is annularly arranged at the edge of the protection plate, and the conductive body forms an upper conductive area and a lower conductive area at the edge position of the upper and lower surfaces of the protection plate respectively, the annular protrusion abuts against the lower conductive area, the positive cover is connected to the upper surface of the protection plate, and the outer shell is connected to the upper conductive area, so that the upper conductive area is connected with the negative electrode of the battery cell.

[0006] Preferably, the cylindrical battery with built-in protection plate further comprises a conductive ring piece arranged between the CID explosion-proof member and the protection plate, and the upper and lower surfaces of the conductive ring piece abut against the lower conductive area and the annular protrusion respectively.

[0007] Preferably, the protection plate, the conductive ring piece and the CID explosion-proof member form an explosion-proof starting space.

[0008] Preferably, the conductive ring piece is made of positive temperature coefficient thermistor material.

[0009] Preferably, the CID explosion-proof component comprises an insulating sleeve and an explosion-proof valve, the insulating sleeve is arranged in the shell, the explosion-proof valve is arranged on the insulating sleeve, the positive electrode of the battery cell is connected with the bottom of the explosion-proof valve, and the annular protrusion is arranged at the edge of the upper surface of the explosion-proof valve.

[0010] Preferably, the explosion-proof valve comprises a first explosion-proof component and a second explosion-proof component, the first explosion-proof component is arranged at the bottom of the insulating sleeve and connected with the positive electrode of the battery cell, and the second explosion-proof component is arranged in the insulating sleeve and connected with the upper surface of the first explosion-proof component, and the annular protrusion is arranged at the edge of the upper surface of the second explosion-proof component.

[0011] Preferably, the second explosion-proof component further comprises a recess, the annular protrusion is arranged outside the recess, and the bottom of the recess is connected with the upper surface of the first explosion-proof component.

[0012] Preferably, the recess is spot-welded with the upper surface of the first explosion-proof component.

[0013] Preferably, the battery cell and the CID explosion-proof component have a gas buffer space.

[0014] Preferably, the positive electrode cover comprises a cover cap and a positive electrode column, the positive electrode column is arranged on the cover cap, the cover cap is arranged on the upper surface of the protection plate and forms a component protection cavity, and the positive electrode column is connected with the upper surface of the protection plate.

[0015] The beneficial effects of the present application are that: the through body is arranged around the edge of the protection plate and forms the upper and lower conduction zones at the edge positions of the upper and lower surfaces of the protection plate, the positive electrode of the battery cell is connected with the CID explosion-proof component, the CID explosion-proof component is connected with the lower conduction zone through the annular protrusion, the shell is connected with the upper conduction zone, and the shell is connected with the negative electrode of the battery cell, so that the upper conduction zone is connected with the negative electrode of the battery cell, that is, the upper conduction zone is equivalent to the positive electrode of the protection plate, and the lower conduction zone is equivalent to the negative electrode of the protection plate. Through the arrangement of the through body, the additional wires for connecting the battery cell and the protection plate in the battery are not needed, the internal structure of the battery is simplified, the integration of the battery is improved, and when the battery is produced and assembled, the wire connection process is saved by using the through body to replace the traditional wire connection structure, the automatic production and assembly of the battery are facilitated, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0017] Figure 1 It is a structure schematic view of the cylindrical battery with the built-in protection plate in the embodiment;

[0018] Figure 2 It is an explosion view of the cylindrical battery with the built-in protection plate in the embodiment;

[0019] Figure 3 A cross-sectional view of a cylindrical battery with built-in protection plate in an embodiment;

[0020] Figure 4 A structural schematic view of a positive cover and a control member in an embodiment;

[0021] Figure 5 A structural schematic view of a control member in an embodiment;

[0022] Figure 6 An exploded view of a CID explosion-proof member in an embodiment;

[0023] Figure 7 A structural schematic view of a conducting ring in an embodiment.

[0024] Reference Signs:

[0025] 1, housing member; 11, outer shell; 111, groove; 12, positive cover; 121, cap; 122, positive post; 2, battery cell; 3, CID explosion-proof member; 31, insulating sleeve; 32, explosion-proof valve; 321, first explosion-proof assembly; 322, second explosion-proof assembly; 3221, annular protrusion; 3222, recess; 4, control member; 41, protection plate; 42, conducting body; 5, conducting ring. DETAILED DESCRIPTION

[0026] Embodiments of the present application will be described below with reference to the drawings. Many practical details are described in the following description for the sake of understanding and illustration. However, it should be understood that these practical details are not intended to limit the present application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, for the sake of simplicity, some conventional structures and components are not shown in the drawings.

[0027] It should be noted that all directional references, such as upper, lower, left, right, front, rear, etc., are in relation to the specific embodiment shown in the drawings and are used only for the purpose of explanation and illustration. These directional references are not intended to limit the application.

[0028] In addition, the descriptions such as "first", "second" and the like in the present application are only for the purpose of description, and do not mean to indicate or imply the order or sequence, nor to limit the present application, which are merely to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0029] In order to further understand the application content, characteristics and effects of the present application, the following examples are given, and the detailed description is as follows with reference to the accompanying drawings.

[0030] Referring to Figures 1-3 , Figure 1 The structure diagram of the cylindrical battery with built-in protection plate in the embodiment, Figure 2 The exploded view of the cylindrical battery with built-in protection plate in the embodiment, Figure 3 The cross-sectional view of the cylindrical battery with built-in protection plate in the embodiment, the cylindrical battery with built-in protection plate in the embodiment includes a shell member 1, an electric core 2, a CID explosion-proof member 3 and a control member 4. The shell member 1 includes an outer shell 11 and a positive cover 12 arranged at one end of the outer shell 11. The electric core 2 is arranged in the outer shell 11, the electric core 2 has a positive electrode and a negative electrode, and the negative electrode of the electric core 2 is in contact with the bottom of the outer shell 11. The CID explosion-proof member 3 is arranged in the outer shell 11, the bottom of the CID explosion-proof member 3 is connected with the positive electrode of the electric core 2, and the edge position of the upper surface of the CID explosion-proof member 3 has a ring-shaped protrusion 3221. The control member 4 includes a protection plate 41 and a conductive body 42, the conductive body 42 is annularly arranged at the edge of the protection plate 41, and the conductive body 42 forms an upper conductive area and a lower conductive area at the edge position of the upper and lower surfaces of the protection plate 41 respectively, the ring-shaped protrusion 3221 abuts against the lower conductive area, the positive cover 12 is connected to the upper surface of the protection plate 41, and the outer shell 11 is connected to the upper conductive area, so that the upper conductive area is connected with the negative electrode of the electric core 2.

[0031] Referring to Figure 4 and Figure 5 , Figure 4 The structure diagram of the positive cover and the control member in the embodiment, Figure 5For the structural schematic diagram of the control member in the embodiment, the cylindrical battery with the built-in protection plate in the embodiment can be applied to smart door locks, power tools, toy models, etc. for energy supply. Since the conductive body 42 is wrapped around the edge of the protection plate 41 and forms an upper conductive area and a lower conductive area at the edge positions of the upper and lower surfaces of the protection plate 41 respectively, the positive electrode of the battery cell 2 is connected with the CID explosion-proof member 3, the CID explosion-proof member 3 is connected with the lower conductive area through the annular protrusion 3221, the shell 11 is connected with the upper conductive area, and the shell 11 is connected with the negative electrode of the battery cell 2, so that the upper conductive area is connected with the negative electrode of the battery cell 2, that is, the upper conductive area is equivalent to the positive electrode of the protection plate 41, and the lower conductive area is equivalent to the negative electrode of the protection plate 41. Through the arrangement of the conductive body 42, it is not necessary to additionally arrange a wire inside the battery to connect the battery cell 2 and the protection plate 41, which simplifies the internal structure of the battery and improves the integration of the battery. At the same time, when the battery is produced and assembled, since the conductive body 41 is used to replace the traditional structure of wire connection, the wire connection process is saved, which is convenient for automatic production and assembly of the battery and improves the production efficiency. Specifically, the protection plate 41 is a BMS control plate, and the upper surface of the protection plate 41 is integrated with control chips, capacitors, inductors and other components. Further, the positive electrode cover 12 includes a cover cap 121 and a positive electrode column 122, the positive electrode column 122 is arranged on the cover cap 121, the cover cap 121 is arranged on the upper surface of the protection plate 41 and forms a component protection cavity, and the positive electrode column 122 is connected to the upper surface of the protection plate 41. Through the arrangement of the cover cap 121, the component protection cavity can be formed on the upper surface of the protection plate 41, and the components on the upper surface of the protection plate 41 can be accommodated in the component protection cavity.

[0032] Referring to Figure 6 , Figure 6 For the explosion view of the CID explosion-proof member in the embodiment, preferably, the CID explosion-proof member 3 includes an insulating sleeve 31 and an explosion-proof valve 32, the insulating sleeve 31 is arranged in the shell 11, and the explosion-proof valve 32 is arranged in the insulating sleeve 31. The positive electrode of the battery cell 2 is connected with the bottom of the explosion-proof valve 32, and the annular protrusion 3221 is arranged at the edge position of the upper surface of the explosion-proof valve 32. Through the arrangement of the explosion-proof valve 32, the gas and internal pressure can be quickly released when the pressure of the battery abnormally rises due to overcharge, short circuit or thermal runaway, so as to prevent the battery from expanding violently, exploding or catching fire, and improve the safety of the battery. Since the explosion-proof valve 32 in the embodiment is made of conductive material and is electrically connected with the positive electrode of the battery cell 2 and the lower conductive area respectively, through the arrangement of the insulating sleeve 31, the explosion-proof valve 32 can be isolated from the shell 11, so as to avoid the direct contact between the explosion-proof valve 32 and the shell 11, which causes the short circuit of the battery. Further, the battery cell 2 and the CID explosion-proof member 3 have a gas buffer space. Since the battery cell 2 often generates gas during formation, the gas buffer space is arranged to reserve space for the gas generated during the formation of the battery cell 2, so as to avoid the excessive pressure between the battery cell 2 and the CID explosion-proof member 3 caused by the gas generated during the formation, thereby avoiding the leakage of the battery cell 2 or the premature activation of the explosion-proof valve.

[0033] With reference back Figure 6 Preferably, the explosion-proof valve 32 comprises a first explosion-proof component 321 and a second explosion-proof component 322. The first explosion-proof component 321 is arranged at the bottom of the insulating sleeve 31 and connected with the positive electrode of the battery cell 2. The second explosion-proof component 322 is arranged in the insulating sleeve 31 and connected with the upper surface of the first explosion-proof component 321. An annular protrusion 3221 is arranged at the edge of the upper surface of the second explosion-proof component 322. In specific applications, the first explosion-proof component 321 is a substrate, and the second explosion-proof component 322 is an explosion-proof sheet. The first explosion-proof component 321 and the second explosion-proof component 322 are connected by laser spot welding. It can be understood that when the pressure in the battery abnormally rises to the starting pressure of the explosion-proof valve 32 due to overcharging, short circuit or thermal runaway, the gas will push up the second explosion-proof component 322, causing the second explosion-proof component 322 to deform and protrude upward, i.e., the spot welding connection between the first explosion-proof component 321 and the second explosion-proof component 322 is disconnected. The upward protruding second explosion-proof component 322 contacts the middle position of the bottom of the protection plate 41 and lifts up the protection plate 41, so that the annular protrusion 3221 is separated from the lower conductive area. Since the edge of the bottom of the protection plate 41 is the lower conductive area, and the middle position of the bottom of the protection plate 41 is not conductive, after the deformation of the second explosion-proof component 322 lifts up the protection plate 41, the protection plate 41 can be disconnected from the battery cell 2, preventing the battery cell 2 from continuing to discharge and improving the safety of the battery. In particular, the starting pressure of the explosion-proof valve 32 in this embodiment is 9.5-11KG or 0.95-1.1mPa.

[0034] With reference back Figure 6 Preferably, the second explosion-proof component 322 further comprises a recessed portion 3222, and the annular protrusion 3221 is arranged around the recessed portion 3222. The bottom of the recessed portion 3222 is connected with the upper surface of the first explosion-proof component 321. In specific applications, in the normal use state of the battery, the annular protrusion 3221 is in contact with the lower conductive area, and the recessed portion 3222 is opposite to the middle position of the bottom of the protection plate 41 but does not contact it. When the pressure in the battery abnormally rises due to overcharging, short circuit or thermal runaway, the explosion-proof valve 32 is activated, i.e., the originally downward recessed recessed portion 3222 connected with the upper surface of the first explosion-proof component 321 deforms, the spot welding connection between the recessed portion 3222 and the upper surface of the first explosion-proof component 321 is disconnected and the recessed portion 3222 protrudes upward to lift up the protection plate 41, so that the annular protrusion 3221 is separated from the lower conductive area, thereby disconnecting the protection plate 41 from the battery cell 2 and preventing the battery cell 2 from continuing to discharge. In particular, the recessed portion 3222 is spot welded with the upper surface of the first explosion-proof component 321.

[0035] Preferably, the cylindrical battery with the built-in protection plate further comprises a conducting ring 5, which is arranged between the CID explosion-proof element 3 and the protection plate 41, and the upper and lower surfaces of the conducting ring 5 abut against the lower conducting area and the annular protrusion 3221 respectively. By arranging the conducting ring 5, an auxiliary connecting member is arranged between the lower conducting area and the annular protrusion 3221, and the contact stability between the lower conducting area and the annular protrusion 3221 is improved. Furthermore, the conducting ring 5 has a central hole in the middle, that is, the lower surface of the protection plate 41, the central hole of the conducting ring 5 and the upper surface of the recessed portion 3222 form an explosion-proof starting space, which reserves space for the upward protrusion of the recessed portion 3222 for the subsequent starting of the explosion-proof valve 32.

[0036] With reference to Figure 7 , Figure 7 The structure of the conducting ring in the embodiment is shown in the schematic view. Preferably, the conducting ring 5 is made of a positive temperature coefficient thermistor material. In specific applications, the conducting ring 5 in the embodiment is equivalent to a positive temperature coefficient thermistor. When the battery is short-circuited, overcharged or over-discharged, the resistance of the conducting ring 5 will increase sharply with the temperature (positive temperature coefficient effect), thereby limiting the current and avoiding the out-of-control temperature in the battery. Moreover, when the temperature in the battery or the environment abnormally rises, the resistance of the conducting ring 5 will automatically increase, thereby reducing the working current and preventing thermal runaway, that is, the secondary protection function is realized in the case of overcurrent, short circuit, over-temperature and the like. Of course, in other embodiments, if the above functions are not required, a nickel ring or other metal ring can be used to replace the conducting ring to reduce the production cost.

[0037] With reference to Figures 1-3 Preferably, the outer surface of the shell 11 is provided with a groove 111. By arranging the groove 111, the inner wall of the groove 111 corresponding to the groove 111 forms an inner convex structure, which can not only fix the battery cell 2, but also serve as a bearing point of the CID explosion-proof element 3, that is, the explosion-proof valve 32 is arranged in the insulating sleeve 31, the conducting ring 5 is arranged on the upper surface of the explosion-proof valve 32, the protection plate 41 is arranged on the upper surface of the conducting ring 5, and the positive cover 12 is arranged on the upper surface of the protection plate 41. The inner convex structure supports the insulating sleeve 31.

[0038] In summary, since the conducting body 42 is arranged around the edge of the protection plate 41 and forms the upper conducting area and the lower conducting area at the edge position of the upper and lower surfaces of the protection plate 41 respectively, the positive electrode of the battery cell 2 is connected with the CID explosion-proof device 3, the CID explosion-proof device 3 is connected with the lower conducting area through the annular protrusion 3221, the shell 11 is connected with the upper conducting area, the shell 11 is connected with the negative electrode of the battery cell 2, so that the upper conducting area is connected with the negative electrode of the battery cell 2, that is, the upper conducting area is equivalent to the positive electrode of the protection plate 41, and the lower conducting area is equivalent to the negative electrode of the protection plate 41. Through the arrangement of the conducting body 42, it is not necessary to additionally arrange a wire to connect the battery cell 2 and the protection plate 41 in the battery, which simplifies the internal structure of the battery and improves the integration of the battery. At the same time, since the conducting body 41 is used to replace the traditional wire connection structure during the production and assembly of the battery, the wire connection process is saved, the automatic production and assembly of the battery is facilitated, and the production efficiency is improved.

[0039] The above is only an embodiment of the present application and is not used to limit the present application. The present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. An inner protection sheet-equipped cylindrical battery characterized by comprising: The application relates to a battery, which comprises the following parts: a housing part (1) comprising an outer shell (11) and a positive cover (12) arranged at one end of the outer shell (11); an electric core (2) arranged in the outer shell (11), wherein the electric core (2) has a positive pole and a negative pole, and the negative pole of the electric core (2) is in contact connection with the bottom of the outer shell (11); a CID explosion-proof part (3) arranged in the outer shell (11), wherein the bottom of the CID explosion-proof part (3) is connected with the positive pole of the electric core (2), and the edge position of the upper surface of the CID explosion-proof part (3) is provided with a ring-shaped protrusion (3221); a control part (4) comprising a protection plate (41) and a conducting body (42), wherein the conducting body (42) is arranged around the edge of the protection plate (41), the edge position of the upper and lower surfaces of the conducting body (42) forms an upper conducting area and a lower conducting area respectively, the ring-shaped protrusion (3221) abuts against the lower conducting area, the positive cover (12) is connected with the upper surface of the protection plate (41), and the outer shell (11) is connected with the upper conducting area, so that the upper conducting area is connected with the negative pole of the electric core (2). The battery further comprises a conducting ring piece (5) arranged between the CID explosion-proof part (3) and the protection plate (41), and the upper and lower surfaces of the conducting ring piece (5) abut against the lower conducting area and the ring-shaped protrusion (3221) respectively.

2. The cylindrical battery with a built-in protection plate according to claim 1, characterized by, An explosion-proof starting space is formed among the protection plate (41), the conducting ring piece (5) and the CID explosion-proof part (3).

3. The cylindrical battery with a built-in protection plate according to claim 2, characterized by, The conducting ring piece (5) is made of a positive temperature coefficient thermistor material.

4. The cylindrical battery with a built-in protection plate according to claim 2, characterized by, The CID explosion-proof part (3) comprises an insulating sleeve (31) and an explosion-proof valve (32), the insulating sleeve (31) is arranged in the outer shell (11), the explosion-proof valve (32) is arranged in the insulating sleeve (31), the positive pole of the electric core (2) is connected with the bottom of the explosion-proof valve (32), and the ring-shaped protrusion (3221) is arranged at the edge position of the upper surface of the explosion-proof valve (32).

5. The protection-board-embedded cylindrical battery according to claim 1, wherein The explosion-proof valve (32) comprises a first explosion-proof assembly (321) and a second explosion-proof assembly (322), the first explosion-proof assembly (321) is arranged at the bottom of the insulating sleeve (31) and connected with the positive pole of the electric core (2), the second explosion-proof assembly (322) is arranged in the insulating sleeve (31) and connected with the upper surface of the first explosion-proof assembly (321), and the edge position of the upper surface of the second explosion-proof assembly (322) is provided with a ring-shaped protrusion (3221).

6. The cylindrical battery with a built-in protection plate according to claim 5, characterized by, The second explosion-proof assembly (322) further comprises a recessed part (3222), the ring-shaped protrusion (3221) is arranged outside the recessed part (3222), and the bottom of the recessed part (3222) is connected with the upper surface of the first explosion-proof assembly (321).

7. The cylindrical battery with a built-in protection plate according to claim 6, characterized by, The recessed part (3222) is connected with the upper surface of the first explosion-proof assembly (321) through spot welding.

8. The cylindrical battery with a built-in protection plate according to claim 7, characterized by, The electric core (2) and the CID explosion-proof part (3) have a gas buffer space.

9. The protection-board-embedded cylindrical battery according to claim 1, wherein ​ 10. The cylindrical battery with a built-in protection plate according to claim 1, characterized by, The positive electrode cover (12) comprises a cover cap (121) and a positive electrode post (122), the positive electrode post (122) is arranged on the cover cap (121), the cover cap (121) is arranged on the upper surface of the protection plate (41) and forms a component protection cavity, and the positive electrode post (122) is connected to the upper surface of the protection plate (41).

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