Cylindrical battery

Abstract

The utility model relates to the technical field of cylindrical batteries, and provides a cylindrical battery which comprises a battery body and a sealing nail, a central hole is formed in the battery body, a liquid injection hole is formed in one end of the battery body, and the liquid injection hole and the central hole are coaxially formed; the sealing nail is connected with the liquid injection hole, the sealing nail is inserted into the center hole from the liquid injection hole, and a hollow channel is formed in the sealing nail. By arranging the sealing nail, the sealing nail extends into the central hole of the battery body, and the sealing nail is provided with the hollow channel, so that the central area of the battery cell is subjected to heat exchange and cooling through the hollow channel in a manner of air heat dissipation or liquid cooling plate cooling in the battery pack. Compared with a traditional sealing nail, the scheme can reduce the temperature of the central area of the battery cell in the using process, and avoids the potential safety hazards such as shortening of the normal service life of the battery cell or thermal runaway caused by thermal accumulation.

Description

TECHNICAL FIELD

[0001] The utility model relates to cylindrical battery technical field, specifically, relate to a cylindrical battery. BACKGROUND

[0002] Cylindrical lithium ion cell in the process of use will produce heat due to electrochemical reaction and other factors, the accumulation of heat will cause the cell temperature to rise, and the cell itself has no cooling structure design, only can slow cooling through natural heat dissipation. At present, the cylindrical lithium ion cell is cooled by air cooling or liquid cooling plate in the battery pack, which only removes heat from the surface, and the continuous electrochemical reaction will still cause the center of the cell to accumulate a certain amount of heat. The temperature at the center position is not obvious, and the high temperature may cause the electrode material to change phase, collapse or have excessive side reactions with the electrolyte, thereby damaging the performance of the electrode material and reducing the actual service life of the cell. At the same time, it also increases the probability of thermal runaway of the cell to some extent, and further causes the risk of fire or explosion. SUMMARY

[0003] The purpose of the utility model includes providing a cylindrical battery, which can reduce the center area temperature of the cell during use, and avoid the safety hazards such as shortening of the normal service life of the cell or thermal runaway caused by heat accumulation.

[0004] The embodiment of the utility model can be realized as follows:

[0005] In a first aspect, the utility model provides a cylindrical battery, comprising:

[0006] A battery body, the battery body is provided with a center hole formed by winding the cell, one end of the battery body is provided with a liquid injection hole, and the liquid injection hole is coaxially arranged with the center hole;

[0007] A sealing nail, the sealing nail is connected with the liquid injection hole, the sealing nail is inserted into the center hole from the liquid injection hole, and the sealing nail is provided with a hollow channel.

[0008] In an optional embodiment, the sealing nail comprises a sealing part and a barrel part connected with each other, the barrel part forms the hollow channel, the sealing part is connected with the liquid injection hole, and the barrel part is inserted into the center hole.

[0009] In an optional embodiment, the height of the barrel part is 45% to 95% of the height of the center hole, and the diameter of the barrel part is 75% to 95% of the diameter of the liquid injection hole.

[0010] In an optional embodiment, the hollow channel comprises a first flow channel and a second flow channel in communication, and the first flow channel and the second flow channel are respectively in communication with the cooling flow channel of the battery pack, so that the cooling liquid circulates in the first flow channel and the second flow channel.

[0011] In an optional embodiment, a partition is arranged in the sealing spike, and the partition is arranged in the hollow channel, so that the partition divides the hollow channel into the first flow channel and the second flow channel in communication.

[0012] In an optional embodiment, the partition is arranged along the extension direction of the hollow channel, and the two sides of the partition are sealingly connected with the inner wall of the sealing spike.

[0013] The partition and the inner bottom wall of the sealing spike are spaced apart, so that a through hole is formed between the partition and the inner bottom wall of the sealing spike.

[0014] In an optional embodiment, the width of the through hole is 50% to 100% of the diameter of the hollow channel, and the length of the through hole is 50% to 200% of the width of the through hole.

[0015] In an optional embodiment, a clamping groove is arranged on the inner wall of the sealing spike, and the cooling flow channel is detachably connected with the clamping groove.

[0016] In an optional embodiment, the cylindrical battery comprises a cover body and a shell, one end of the cover body and the shell is connected and internally accommodates the battery cell, and a liquid injection hole is arranged at the center of the cover body.

[0017] In an optional embodiment, the cover body is provided with a pressure relief groove.

[0018] The cover body is further provided with an annular mounting groove extending outwardly along the liquid injection hole, and the sealing spike is sealingly connected with the annular mounting groove.

[0019] The cylindrical battery provided by the embodiment of the utility model has the following beneficial effects:

[0020] By arranging the sealing spike, the sealing spike extends into the center hole of the battery body, and the sealing spike is provided with a hollow channel, so that the battery pack can heat exchange and cool the center area of the battery cell by the air cooling or liquid cooling plate cooling mode. Compared with the traditional sealing spike, the present scheme can reduce the temperature of the center area of the battery cell during use, and avoid the safety hazards such as shortening of the normal service life of the battery cell or thermal runaway caused by heat accumulation. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the premise of the drawings.

[0022] Figure 1 The structural schematic diagram of the cylindrical battery from a first perspective is provided for the present embodiment.

[0023] Figure 2 The structural schematic diagram of the bottom of the cylindrical battery is provided for the present embodiment.

[0024] Figure 3 The Figure 2 cross-sectional view of A-A in the middle;

[0025] Figure 4 The Figure 3 partial schematic view of B in the middle;

[0026] Figure 5 The Figure 3 partial schematic view of C in the middle.

[0027] Icon: 010-cylindrical battery; 100-battery body; 110-cover; 111-liquid injection hole; 112-liquid injection part; 113-pressure relief groove; 120-shell; 130-cell; 131-center hole; 140-pole assembly; 150-current collector plate; 200-sealing nail; 210-sealing part; 220-cylinder part; 221-clamping groove; 2211-first clamping groove; 2212-second clamping groove; 230-separation part; 240-hollow channel; 241-first flow channel; 242-second flow channel; 243-through hole. DETAILED DESCRIPTION

[0028] In the related art, the method for cooling the cell is usually to assemble a battery pack and set a cooling means in the battery pack: one is to open an air port in the battery pack to cool by air flow; the other is to set a liquid cooling plate in the battery pack to take away heat by circulating cooling liquid.

[0029] The cylindrical lithium ion cell is cooled by air cooling or liquid cooling plate in the battery pack, which only takes away heat from the surface, and the continuous electrochemical reaction still causes a certain amount of heat to accumulate in the center of the cell, and the cooling effect at the center position is not obvious, and the high temperature at the center position may cause phase change, structure collapse or excessive side reaction with electrolyte of the electrode material, so as to damage the performance of the electrode material and reduce the actual service life of the cell. At the same time, it also increases the probability of thermal runaway of the cell to a certain extent, and further causes the risk of fire or explosion.

[0030] In order to solve the above problems, the utility model provides a cylindrical battery, reduces the center area temperature of electric core in the use process, thereby can improve the problem of shortening of normal use life of electric core or appearing of thermal runaway and other security risks caused by heat accumulation.

[0031] In order to make the purpose, technical scheme and advantage of the embodiments of the utility model more clear, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, obviously, the described embodiments are a part of the embodiments of the utility model, not all the embodiments of the utility model. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0033] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0034] In the description of the utility model, it should be explained that, if the orientation or position relationship indicated by the terms "upper", "lower", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship of the utility model product when it is usually placed, 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, structure and operation, therefore, it cannot be understood as a limitation on the utility model.

[0035] In addition, if the terms "first", "second" and the like appear, they are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0036] It should be explained that, in the case of no conflict, the features in the embodiments of the utility model can be combined with each other.

[0037] The overall structure, working principle and technical effects of the cylindrical battery 010 provided by the utility model will be described in detail below through embodiments and in conjunction with the drawings.

[0038] Please refer to Figure 1 The cylindrical battery 010 provided by the utility model is applied in a battery pack.

[0039] Please refer to Figure 1 The utility model provides a cylindrical battery 010, including battery body 100 and sealing nail 200, the inside of battery body 100 is equipped with center hole 131, and one end of battery body 100 is equipped with liquid injection hole 111, and liquid injection hole 111 is coaxial with center hole 131, sealing nail 200 is connected with liquid injection hole 111, and sealing nail 200 inserts into center hole 131 from liquid injection hole 111, and sealing nail 200 is equipped with hollow passage 240.

[0040] It can be understood that by setting sealing nail 200, sealing nail 200 extends into the center hole 131 of the battery body 100, and the sealing nail 200 is provided with a hollow passage 240, so that the battery pack is cooled by air cooling or liquid cooling plate, and the center area of the battery cell 130 is cooled by the hollow passage 240. Compared with the conventional sealing nail 200, the present scheme can reduce the center area temperature of the battery cell 130 during use, and avoid the safety hazards such as shortening of the normal service life of the battery cell 130 or thermal runaway caused by heat accumulation.

[0041] In the embodiment, the cylindrical battery 010 includes the battery body 100.

[0042] Among them, the battery body 100 is provided with the center hole 131 wound by the battery cell 130, and one end of the battery body 100 is provided with the liquid injection hole 111 coaxially arranged with the center hole 131.

[0043] In the embodiment, please refer to Figures 1-3 The cylindrical battery 010 includes a cover body 110, a shell 120 and a battery cell 130, one end of the cover body 110 and the shell 120 is connected and internally accommodates the battery cell 130; the center of the cover body 110 is provided with a liquid injection hole 111 for injecting electrolyte.

[0044] Among them, please refer to Figure 3 The battery cell 130 forms a cylindrical center hole 131 in the process of winding.

[0045] Among them, please refer to Figure 2 The cover body 110 is a disc structure, and the outer edge of the cover body 110 is welded and sealed with the mouth of the shell 120 to connect, so that the battery cell 130 is isolated from the outside world, and failure caused by the influence of the external environment is avoided; the cover body 110 extends along the liquid injection hole 111 to the center hole 131 and has an annular liquid injection part 112.

[0046] Optionally, please refer to Figure 2 The cover body 110 is provided with a pressure relief groove 113, and the pressure relief groove 113 is arranged along the disc structure of the cover body 110 and has an arc structure.

[0047] Optionally, please refer toFigure 4 The cover 110 is further provided with an annular mounting groove extending outward along the liquid injection hole 111, the annular mounting groove is recessed, and the sealing part 210 of the sealing spike 200 is sealingly connected with the annular mounting groove.

[0048] Optionally, referring to Figure 3 The cylindrical battery 010 further comprises a pole assembly 140, the pole assembly 140 is arranged at the top end of the shell 120, the cover 110 is arranged at the bottom end of the shell 120, the battery cell 130 is provided with a positive electrode lug at the top end, and the pole assembly 140 is weldingly connected with the positive electrode lug.

[0049] Optionally, referring to Figure 3 The cylindrical battery 010 further comprises a current collector 150, the current collector 150 is arranged between the top end and the bottom end of the battery cell 130 and the shell 120.

[0050] In this embodiment, the cylindrical battery 010 comprises a sealing spike 200.

[0051] Optionally, referring to Figure 3 The sealing spike 200 is connected with the liquid injection hole 111, the sealing spike 200 is inserted into the center hole 131 from the liquid injection hole 111, and the sealing spike 200 is provided with a hollow passage 240.

[0052] In one embodiment, the cooling mode of the battery pack through air heat dissipation is to cool the center area of the battery cell 130 through the hollow passage 240. The sealing spike 200 comprises a sealing part 210 and a barrel part 220 connected with each other, the barrel part 220 forms a columnar hollow passage 240, the sealing part 210 is connected with the liquid injection hole 111, and the barrel part 220 is inserted into the center hole 131.

[0053] It can be understood that, in the cooling mode of the battery pack through air heat dissipation, air enters the hollow passage 240 of the sealing spike 200 and exchanges heat with the center area of the battery cell 130, so as to cool the center area of the battery cell 130.

[0054] In another embodiment, referring to Figure 3 The cooling mode of the battery pack through a liquid cooling plate is to cool the center area of the battery cell 130 through the hollow passage 240. The hollow passage 240 comprises a first flow channel 241 and a second flow channel 242 connected with each other, the first flow channel 241 and the second flow channel 242 are respectively connected with the cooling flow channel of the battery pack, so that the cooling liquid circulates in the first flow channel 241 and the second flow channel 242.

[0055] In this embodiment, referring to Figures 3-5The sealing nail 200 comprises a sealing part 210, a barrel part 220 and a partition part 230, the barrel part 220 forms a hollow channel 240 in a column shape, the sealing part 210 is connected with the liquid injection hole 111, and the barrel part 220 is inserted into the center hole 131.

[0056] The partition part 230 is arranged in the hollow channel 240, so that the partition part 230 divides the hollow channel 240 into the first flow channel 241 and the second flow channel 242.

[0057] Optionally, referring to Figures 3-5 The partition part 230 is in a rectangular plate shape, and is arranged along the extension direction of the hollow channel 240, the two sides of the partition part 230 are sealingly connected with the inner wall of the barrel part 220 of the sealing nail 200, so that the partition part 230 divides the hollow channel 240 into the first flow channel 241 and the second flow channel 242. The partition part 230 and the inner bottom wall of the barrel part 220 of the sealing nail 200 are spaced apart, so that a through hole 243 is formed between the partition part 230 and the inner bottom wall of the barrel part 220 of the sealing nail 200, and the first flow channel 241 and the second flow channel 242 are communicated through the through hole 243.

[0058] Optionally, the width of the through hole 243 is 50% to 100% of the diameter of the hollow channel 240, and the length of the through hole 243 is 50% to 200% of the width of the through hole 243.

[0059] Optionally, referring to Figure 4 The inner wall of the barrel part 220 of the sealing nail 200 is provided with a clamping groove 221, and the cooling flow channel is detachably connected with the clamping groove 221. The clamping groove 221 is divided into a first clamping groove 2211 and a second clamping groove 2212 by the partition part 230, the first clamping groove 2211 is located in the first flow channel 241, the second clamping groove 2212 is located in the second flow channel 242, and the first clamping groove 2211 and the second clamping groove 2212 are respectively detachably connected with the cooling flow channel.

[0060] In an embodiment, the connection between the cooling flow channel and the clamping groove 221 can be provided with a threaded structure, and the sealing nail 200 and the cooling channel are connected together by means of screwing the knob. Of course, in other embodiments, the cooling flow channel and the clamping groove 221 can also be detachably connected by clamping or the like.

[0061] It can be understood that the cooling liquid in the liquid cooling channel of the battery pack flows from the first channel, flows back to the liquid cooling channel from the second flow channel 242 after passing through the through hole 243, so that the first flow channel 241 and the second flow channel 242 circulate the cooling liquid with the liquid cooling channel. In this way, the cooling liquid is circulated to absorb the heat of the center area of the battery cell 130 during the normal use of the cylindrical battery 010 and carry it out to achieve heat exchange and cooling.

[0062] Optionally, the cooling liquid can be a water-containing cooling liquid, such as a water-glycol mixture, and can also be a water-free cooling liquid, such as a glycol cooling liquid. The specific type is not limited as long as the heat of the battery cell 130 during operation can be absorbed.

[0063] Optionally, please refer to Figure 2 The sealing part 210 is in a ring structure, and the sealing nail 200 of the ring structure is sealingly connected to the ring-shaped mounting groove on the cover 110 through welding.

[0064] Optionally, the height of the cylinder part 220 is 45% to 95% of the height of the center hole 131, and the diameter of the cylinder part 220 is 75% to 95% of the diameter of the liquid injection hole 111.

[0065] The working principle and process of the cylindrical battery 010 provided in the embodiment of the utility model are as follows: the cooling liquid in the liquid cooling channel of the battery pack flows into the first channel, flows back into the liquid cooling channel from the second flow channel 242 after the through hole 243, so that the first flow channel 241 and the second flow channel 242 circulate and flow the cooling liquid. In this way, the cooling liquid circulation is used to absorb the heat of the center area of the battery cell 130 during normal use of the cylindrical battery 010 and take it out to realize heat exchange and cooling.

[0066] In summary, the cylindrical battery 010 provided in the embodiment of the utility model is provided with the sealing nail 200, the sealing nail 200 extends into the center hole 131 of the battery body 100, and the sealing nail 200 is provided with the hollow channel 240, so that the center area of the battery cell 130 is cooled by the hollow channel 240 in the air cooling or liquid cooling plate cooling mode in the battery pack. Compared with the conventional sealing nail 200, the present scheme can reduce the temperature of the center area of the battery cell 130 during use, and avoid the safety hazards such as shortening of the normal service life of the battery cell 130 or thermal runaway caused by heat accumulation.

[0067] The above is only a specific implementation manner of the utility model, but the protection scope of the utility model is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A cylindrical battery, characterized by comprising: The application relates to a cylindrical battery. The battery body is internally provided with a center hole formed by winding an electric core, and one end of the battery body is provided with a liquid injection hole coaxial with the center hole. The sealing nail is connected with the liquid injection hole, and the sealing nail is inserted into the center hole from the liquid injection hole.

2. The cylindrical battery according to claim 1, characterized by The sealing nail comprises a sealing part and a barrel part connected with each other, the barrel part forms the hollow channel, the sealing part is connected with the liquid injection hole, and the barrel part is inserted into the center hole.

3. The cylindrical battery according to claim 2, characterized by, The height of the barrel part is 45%-95% of the height of the center hole, and the diameter of the barrel part is 75%-95% of the diameter of the liquid injection hole.

4. The cylindrical battery according to claim 1, characterized by, The hollow channel comprises a first flow channel and a second flow channel connected with each other, the first flow channel and the second flow channel are respectively connected with the cooling flow channel of the battery pack, so that the cooling liquid circulates in the first flow channel and the second flow channel.

5. The cylindrical battery according to claim 4, characterized by The sealing nail is internally provided with a partition part, the partition part is arranged in the hollow channel, so that the partition part divides the hollow channel into the first flow channel and the second flow channel connected with each other.

6. The cylindrical battery according to claim 5, characterized by The partition part is arranged along the extension direction of the hollow channel, and the two sides of the partition part are sealingly connected with the inner wall of the sealing nail. The partition part and the inner bottom wall of the sealing nail are spaced apart, so that a through hole is formed between the partition part and the inner bottom wall of the sealing nail.

7. The cylindrical battery according to claim 6, characterized by The width of the through hole is 50%-100% of the diameter of the hollow channel, and the length of the through hole is 50%-200% of the width of the through hole.

8. The cylindrical battery according to claim 4, wherein The inner wall of the sealing nail is provided with a clamping groove, and the cooling flow channel is detachably connected with the clamping groove.

9. The cylindrical battery according to claim 1, wherein The cylindrical battery comprises a cover body and a shell, one end of the cover body and the shell is connected and internally accommodates the electric core, and the center of the cover body is provided with a liquid injection hole.

10. The cylindrical battery according to claim 9, characterized by The cover body is provided with a pressure relief groove. The cover body is further provided with an annular mounting groove extending outward along the liquid injection hole, and the sealing nail is sealingly connected with the annular mounting groove.

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