Exhaust mechanism, battery, battery pack and electric energy equipment

Abstract

The utility model discloses an exhaust mechanism, a battery, a battery pack and electric energy equipment. The exhaust mechanism is used for exhausting to-be-exhausted equipment; the exhaust mechanism comprises a shell and a sealing piece, the shell is provided with a communicating hole, a first inner cavity and an exhaust hole, and the communicating hole, the first inner cavity and the exhaust hole are communicated; the first inner cavity is communicated with an inner cavity of equipment to be exhausted through a communicating hole, and the first inner cavity is communicated with the outside through an exhaust hole; the sealing piece is arranged in the first inner cavity, and the circumferential surface of the sealing piece abuts against the cavity side wall of the first inner cavity to seal at least part of the first inner cavity; and when the gas in the inner cavity of the to-be-exhausted equipment is increased, the gas pressure of the inner cavity of the to-be-exhausted equipment is increased to a preset range, the sealing piece moves so that a gap can be formed between the circumferential surface of the sealing piece and the cavity side wall of the first inner cavity, and the gas is exhausted through the exhaust hole. According to the exhaust mechanism provided by the invention, gas generated in the to-be-exhausted equipment can be exhausted in time through the exhaust mechanism, so that the safety performance of the to-be-exhausted equipment is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an exhaust mechanism, a battery, a battery pack and an electric energy device. Background Art

[0002] During the use of the exhaust equipment provided by the related technology, a certain amount of gas will be generated inside the exhaust equipment. However, the reserved space inside the exhaust equipment is limited. As the gas production increases, the gas pressure inside the exhaust equipment increases. The exhaust equipment is prone to structural damage due to gas expansion, causing safety issues. Utility Model Content

[0003] The purpose of the present application is to provide an exhaust mechanism, a battery, a battery pack and an electric energy device. In the exhaust mechanism provided in the present application, the gas generated inside the exhaust device can be discharged in time through the exhaust mechanism, thereby improving the safety performance of the exhaust device.

[0004] According to a first aspect of the present application, there is provided an exhaust mechanism, which is used to exhaust the equipment to be exhausted; the exhaust mechanism comprises a shell and a sealing member, the shell is provided with a connecting hole, a first inner cavity and an exhaust hole, the connecting hole, the first inner cavity and the exhaust hole are connected; the first inner cavity is connected to the inner cavity of the equipment to be exhausted through the connecting hole, and the first inner cavity is connected to the outside through the exhaust hole; the sealing member is arranged in the first inner cavity, and the peripheral surface of the sealing member abuts against the side wall of the first inner cavity to seal at least part of the first inner cavity; when the gas in the inner cavity of the equipment to be exhausted increases, the gas pressure in the inner cavity of the equipment to be exhausted increases to a preset range, so that a gap is formed between the peripheral surface of the sealing member and the side wall of the first inner cavity, so that the gas is discharged through the exhaust hole.

[0005] In some embodiments, the seal isolates the first inner cavity into a first sub-cavity and a second sub-cavity, the first sub-cavity is connected to the outside through the exhaust hole, the exhaust holes are connected, and the second sub-cavity is connected to the inner cavity of the device to be exhausted through the connecting hole.

[0006] In some embodiments, the exhaust mechanism also includes a limit valve and a first push member, the limit valve and at least part of the first push member are arranged in the first sub-cavity, and the limit valve abuts between the first push member and the sealing member; the side wall of the first sub-cavity is recessed with a accommodating cavity; when the air pressure in the inner cavity of the equipment to be exhausted increases to a preset range, the first push member is used to push against the limit valve so that the limit valve is received in the accommodating cavity, and the sealing member can move relative to the side wall of the first sub-cavity.

[0007] In some embodiments, a stop surface is provided inside the first inner cavity, the stop surface is located on a side of the sealing member facing away from the limit valve, and the stop surface abuts against the sealing member.

[0008] In some embodiments, the first push member includes a first abutting top portion and a first operating portion, the first abutting top portion is arranged in the first sub-cavity, and the first operating portion extends out of the first sub-cavity through the exhaust hole; the limit valve is provided with an abutting inclined surface; the first operating portion is used to drive the first abutting top portion to move, and the first abutting top portion abuts against the abutting inclined surface to make the limit valve movable and accommodated in the accommodating cavity.

[0009] In some embodiments, the exhaust mechanism further includes a first driving member, the first driving member is connected to the first operating part, and the first driving member is used to drive the first operating part to move.

[0010] In some embodiments, the exhaust mechanism further includes a sensor, which is disposed in the second sub-cavity and is used to detect the air pressure value of the second sub-cavity.

[0011] In some embodiments, the exhaust mechanism further includes a second push member, at least a portion of which is disposed in the first sub-cavity, and the second push member can move toward the sealing member to abut against the sealing member so that the sealing member seals the second sub-cavity.

[0012] In some embodiments, the second push member includes a second push top portion and a second operating portion, the second push top portion is disposed in the first sub-cavity, and the second operating portion extends out of the first sub-cavity through the exhaust hole.

[0013] In some embodiments, the exhaust mechanism further includes a second driving member connected to the second operating part, the second driving member being used to drive the second operating part to move, and the second operating part drives the second abutting top to move so that the second abutting top abuts against the sealing member.

[0014] In some embodiments, the exhaust mechanism further includes an elastic member, which is located between the cavity side of the accommodating cavity and the limit valve; the elastic member can provide elastic force to the limit valve to drive the limit valve to move out of the accommodating cavity.

[0015] A second aspect of the present application provides a battery, the battery comprising the exhaust mechanism provided in the embodiment of the first aspect, the exhaust mechanism being used to exhaust gas inside the battery.

[0016] A third aspect of the present application provides a battery pack, comprising a pack body and a plurality of batteries provided in the embodiment of the second aspect, wherein the plurality of batteries are connected in sequence and installed in the pack body.

[0017] A fourth aspect of the present application provides an electric energy device, the electric energy device comprising a battery pack provided by any embodiment of the third aspect, the battery pack being used to supply power to the electric energy device.

[0018] In the exhaust mechanism provided in the embodiment of the present application, the gas in the inner cavity of the equipment to be exhausted can be discharged in time through the exhaust mechanism, which can avoid structural deformation of the equipment to be exhausted due to gas production and structural damage to the equipment to be exhausted, thereby improving the safety performance of the equipment to be exhausted. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation scheme are briefly introduced below.

[0020] Figure 1 It is a structural schematic diagram of an exhaust mechanism and a device to be exhausted provided in one embodiment of the present application.

[0021] Figure 2 yes Figure 1 Cross-sectional view of the exhaust mechanism and the equipment to be exhausted along line AA.

[0022] Figure 3 yes Figure 1 A cross-sectional view of the exhaust mechanism and the device to be exhausted along line AA in another embodiment.

[0023] Figure 4 It is a cross-sectional view of an exhaust mechanism provided in one embodiment of the present application.

[0024] Figure 5 yes Figure 4 A cross-sectional view of the exhaust mechanism in another embodiment.

[0025] Figure 6 yes Figure 4 A cross-sectional view of the exhaust mechanism in another embodiment.

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of a battery provided in one embodiment of the present application.

[0027] Figure 8 yes Figure 7 Cross-sectional view of the battery along line BB.

[0028] Fig. 9 yes Figure 7 A cross-sectional view of a middle battery along line BB in another embodiment.

[0029] Description of reference numerals:

[0030] 200-device to be exhausted; 100-battery; 10-housing; 101-second inner cavity; 103-first end wall; 104-second end wall; 105-first side wall; 106-second side wall; 107-first bottom wall; 108-first top wall; 109-liquid injection hole; 110-explosion-proof hole; 20-electrode assembly; 21-pole core; 231-positive pole; 232-negative pole; 30-exhaust mechanism; 31-housing; 311-first inner cavity; 3111-first sub-cavity; 3112-second sub-cavity; 3113-accommodation cavity; 3114-stop Block; 3115-stop surface; 312-connecting hole; 313-exhaust hole; 314-gap; 315-second top wall; 316-second bottom wall; 317-peripheral wall; 33-sealing member; 331-rotating part; 332-sealing part; 34-limit valve; 341-abutting inclined surface; 35-first push member; 351-first abutting top part; 352-first operating part; 36-first driving member; 301-sensing member; 37-second push member; 371-second abutting top part; 372-second operating part; 38-second driving member; 39-elastic member. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] In the description of the application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more related listed items.

[0034] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0035] See also Figures 1 to 3 The embodiment of the present application provides an exhaust mechanism 30, and the exhaust mechanism 30 is used to exhaust the equipment 200 to be exhausted.

[0036] The exhaust mechanism 30 includes a shell 31 and a sealing member 33. The shell 31 is provided with a connecting hole 312, a first inner cavity 311 and an exhaust hole 313. The connecting hole 312, the first inner cavity 311 and the exhaust hole 313 are connected. The first inner cavity 311 is connected to the inner cavity of the device to be exhausted 200 through the connecting hole 312, and the first inner cavity 311 is connected to the outside through the exhaust hole 313. The sealing member 33 is arranged in the first inner cavity 311, and the peripheral surface of the sealing member 33 abuts against the side wall of the first inner cavity 311 to seal at least a portion of the first inner cavity 311.

[0037] When the gas in the inner cavity of the exhaust device 200 increases and the gas pressure in the inner cavity of the exhaust device 200 increases to a preset range, the seal 33 moves to form a gap 314 between the circumference of the seal 33 and the side wall of the first inner cavity 311, so that the gas can be discharged through the exhaust hole 313.

[0038] In the exhaust mechanism 30 provided in the embodiment of the present application, the gas in the inner cavity of the exhaust device 200 can be discharged in time through the exhaust mechanism 30, which can avoid structural deformation of the exhaust device 200 due to gas production and structural damage to the exhaust device 200, thereby improving the safety performance of the exhaust device 200. The exhaust mechanism 30 can be applied to a storage tank, a chemical reaction device or a battery, without limitation herein.

[0039] See also Figures 4 to 6 The sealing member 33 includes a rotating portion 331 and a sealing portion 332. The circumference of the rotating portion 331 is rotatably connected to the cavity wall surface of the first inner cavity 311, and the rotating portion 331 can move relative to the cavity wall surface of the first inner cavity 311; the circumference of the sealing portion 332 abuts against the cavity wall surface of the first inner cavity 311, that is, the sealing portion 332 and the cavity wall surface of the first inner cavity 311 have an interference fit, and can isolate the connecting hole 312 and the exhaust hole 313. The rotating portion 331 is fixedly connected to the sealing portion 332, and the rotating portion 331 can drive the sealing portion to move relative to the cavity wall surface of the first inner cavity 311, so that the sealing portion 332 and the cavity wall surface of the first inner cavity 311 have a clearance fit, and the circumference of the sealing portion 332 and the cavity wall surface of the first inner cavity 311 form a gap 314, and the connecting hole 312 and the exhaust hole 313 are connected through the gap 314.

[0040] The sealing member 33 separates the first inner cavity 311 into a first sub-cavity 3111 and a second sub-cavity 3112. The first sub-cavity 3111 is connected to the outside through the exhaust hole 313, and the second sub-cavity 3112 is connected to the inner cavity of the device to be exhausted 200 through the connecting hole 312. On the one hand, the second sub-cavity 3112 is an expansion space of the inner cavity of the device to be exhausted 200, and the gas generated in the inner cavity of the device to be exhausted 200 can enter the second sub-cavity 3112, thereby increasing the reserved space of the device to be exhausted 200; on the other hand, the second sub-cavity 3112 can stabilize the gas pressure and buffer the gas, thereby improving the safety of the device to be exhausted 200.

[0041] In some embodiments, the exhaust mechanism 30 further includes a limit valve 34 and a first push member 35. The limit valve 34 and at least part of the first push member 35 are arranged in the first sub-cavity 3111, and the limit valve 34 abuts between the first push member 35 and the sealing member 33, that is, the first push member 35, the limit valve 34 and the sealing member 33 are arranged in sequence, and the cavity wall surface of the first sub-cavity 3111 is concavely provided with an accommodating cavity 3113.

[0042] When the air pressure in the inner cavity of the exhaust device 200 increases to a preset range, the first push member 35 is used to push against the limit valve 34 so that the limit valve 34 is accommodated in the accommodating cavity 3113, and the limit valve 34 and the sealing member 33 are released from the push, so that the sealing member 33 can move.

[0043] A stop surface 3115 is provided inside the first inner cavity 311. The stop surface 3115 is located on the side of the seal 33 away from the limit valve. The stop surface 3115 abuts against the seal 33 to prevent the limit valve from abutting against the seal 33 and moving toward the second sub-cavity 3112, thereby preventing the sealing connection of the seal 33 from failing. In this embodiment, the cavity side of the first inner cavity 311 is an equal diameter structure, and a stop block 3114 is provided on the cavity side of the second sub-cavity 3112. The stop block 3114 is provided on the side of the seal 33 away from the limit valve, that is, the limit valve 34, the seal 33 and the stop block 3114 are provided in sequence, and the stop surface 3115 is provided on the side of the stop block 3114 facing the seal 33, and the stop surface 3115 abuts against the seal 33.

[0044] In other embodiments, the cavity side of the first inner cavity 311 is a variable diameter structure, the inner diameter of the first sub-cavity 3111 is larger than the inner diameter of the second sub-cavity 3112, and a stop surface 3115 is formed between the first sub-cavity 3111 and the second sub-cavity 3112, and the stop surface 3115 is against the seal 33.

[0045] In some embodiments, the first push member 35 includes a first push-up portion 351 and a first operating portion 352, which are fixedly connected to each other, wherein the first push-up portion 351 is disposed in the first sub-cavity 3111, and the first operating portion 352 extends out of the first sub-cavity 3111 through the exhaust hole 313. The first operating portion 352 extends out of the first sub-cavity 3111 for easy operation.

[0046] The first push member 35 is provided with a first through hole, which passes through the first push top portion 351 and the first operating portion 352, and the first through hole of the first push member 35, the first sub-cavity 3111, and the exhaust hole are connected. The outer side surface of the first operating portion 352 abuts against the hole wall surface of the exhaust hole 313, and the outer side surface of the first push top portion 351 abuts against the cavity side surface of the first sub-cavity 3111. The hole wall surface of the exhaust hole 313 and the cavity side surface of the first sub-cavity 3111 can guide the movement of the first push member 35.

[0047] The limit valve 34 is provided with an abutting inclined surface 341. Specifically, the limit valve 34 is a variable diameter structure, and the outer diameter of the limit valve 34 gradually increases from the first sub-cavity 3111 to the second sub-cavity 3112, and the limit valve 34 forms an abutting inclined surface 341 on one side facing the first abutting top portion 351.

[0048] The first operating portion 352 is used to drive the first abutting portion 351 to move, and the first abutting portion 351 abuts against the abutting inclined surface 341 , so that the limit valve 34 moves and is received in the accommodating chamber 3113 .

[0049] In some embodiments, the exhaust mechanism further includes a first driving member 36, which is connected to the first operating portion 352 and is used to drive the first operating portion 352 to move. In this example, the first driving member 36 is used to drive the first operating portion 352 to move. The first driving member 36 can be, but is not limited to, a motor, an electric motor, etc.

[0050] In some embodiments, the exhaust mechanism 30 further includes a sensing element 301 , which is disposed in the second sub-cavity 3112 . More specifically, the sensing element 301 is installed on the cavity wall of the second sub-cavity 3112 . The sensing element 301 is an air pressure sensor for detecting the air pressure value of the second sub-cavity 3112 .

[0051] The sensing member 301 can collect the air pressure value of the second sub-chamber 3112. When the air pressure value of the second sub-chamber 3112 is greater than or equal to the first preset air pressure value, the first driving member 36 drives the first operating part 352 to move, and the first operating part 352 drives the first abutting top part 351 to move. The first abutting top part 351 abuts against the limit valve 34, and the limit valve 34 moves into the accommodating chamber 3113 until the limit valve 34 is accommodated in the accommodating chamber 3113. The limit valve 34 and the sealing member 33 release the abutment, and the gas in the second sub-chamber 3112 drives the sealing member 33 to move. The peripheral surface of the sealing member 33 and the side wall of the first inner cavity form a gap 314, and the gas in the second sub-chamber 3112 is discharged through the gap 314, the first sub-chamber 3111 and the exhaust hole 313.

[0052] In some embodiments, the exhaust hole 313 is connected to a gas collecting device via a connecting pipe. The gas collecting device is used to collect gas. The gas passes through a component detection device to analyze the specific composition of the gas inside the exhaust device 200 to be exhausted, providing more reliable data support for the design of the exhaust device 200.

[0053] In some embodiments, the exhaust mechanism 30 also includes a second push member 37, at least part of which is disposed in the first sub-cavity 3111, and the second push member 37 is used to push the seal 33, and the seal 33 is movable. The second push member 37 can move toward the seal 33 to push against the seal 33, so that the seal 33 seals the second sub-cavity 3112.

[0054] Specifically, the second push member 37 includes a second push top portion 371 and a second operating portion 372, which are fixedly connected, wherein the second push top portion 371 is disposed in the first sub-cavity 3111, and the second operating portion 372 extends out of the first sub-cavity 3111 through the exhaust hole 313. The second operating portion 372 extends out of the first sub-cavity 3111 for easy operation.

[0055] The second push member 37 is provided with a second through hole, which penetrates the second push top portion 371 and the second operating portion 372. The second through hole of the second push member 37, the first sub-cavity 3111, and the first through hole of the first push member 35 are connected, and gas can be discharged through the second through hole. The outer side surface of the second operating portion 372 is in contact with the hole wall surface of the first through hole, which can guide the movement of the second push member 37.

[0056] The exhaust mechanism 30 further includes a second driving member 38, which is connected to the second operating portion 372 and is used to drive the second operating portion 372 to move. In this example, the second driving member 38 is used to drive the second operating portion 372 to move, and the second operating portion 372 drives the second abutting portion 371 to move, so that the second abutting portion 371 abuts against the sealing member 33. The second driving member 38 can be, but is not limited to, a motor, an electric motor, etc.

[0057] The sensing member 301 can collect the air pressure value of the second sub-cavity 3112. When the air pressure value of the second sub-cavity 3112 is less than or equal to the second preset air pressure value, the second driving member 38 drives the second operating part 372 to move, the second operating part 372 drives the second abutting top part 371 to move, the second abutting top part 371 abuts the sealing member 33, the sealing member 33 moves, the peripheral surface of the sealing member 33 abuts against the side wall of the first inner cavity, and the sealing member 33 again isolates the first sub-cavity 3111 and the second sub-cavity 3112. Then, the second driving member 38 drives the second operating part 372 to move, the second operating part 372 drives the second abutting top part 371 to move, so that the second push member 37 moves and resets.

[0058] In some embodiments, the exhaust mechanism 30 further includes an elastic member 39, which is disposed in the accommodating chamber 3113, and is located between the side surface of the accommodating chamber 3113 and the limit valve 34. The elastic member 39 can provide elastic force to the limit valve 34 to drive the limit valve 34 to move out of the accommodating chamber 3113. When the limit valve 34 moves into the accommodating chamber 3113, the limit valve 34 presses against the elastic member 39, the elastic member 39 is compressed, and the elastic member 39 has a movement tendency of expansion. The sensing member 301 can collect the air pressure value of the second sub-chamber 3112. When the air pressure value of the second sub-chamber 3112 is less than or equal to the second preset air pressure value, the first driving member 36 drives the first operating part 352 to move, and the first operating part 352 drives the first abutting top part 351 to move. The first abutting top part 351 withdraws from the opening of the accommodating chamber 3113. The elastic member 39 provides elastic force to the limit valve 34. The elastic member 39 drives the limit valve 34 to withdraw from the accommodating chamber 3113, and the limit valve 34 abuts against the sealing member 33.

[0059] The operating method of the exhaust mechanism 30 provided in the embodiment of the present application is as follows:

[0060] The sensing member 301 can collect the air pressure value of the second sub-cavity 3112. When the air pressure value of the second sub-cavity 3112 is greater than or equal to the first preset air pressure value, the first driving member 36 drives the first operating part 352 to move, the first operating part 352 drives the first abutting top part 351 to move, the first abutting top part 351 abuts against the limit valve 34, the limit valve 34 moves into the accommodating cavity 3113, and at the same time, the limit valve 34 abuts against the elastic member 39, the elastic member 39 is compressed, and the elastic member 39 has a movement tendency of expansion. The limit valve 34 and the sealing member 33 are released from abutment, the gas in the second sub-cavity 3112 drives the sealing member 33 to move, the peripheral surface of the sealing member 33 and the cavity side wall of the first inner cavity form a gap 314, and the gas in the second sub-cavity 3112 is discharged through the gap 314 and the second through hole.

[0061] When the air pressure value of the second sub-cavity 3112 is less than or equal to the second preset air pressure value, the second driving member 38 drives the second operating part 372 to move, the second operating part 372 drives the second abutting top part 371 to move, the second abutting top part 371 abuts against the sealing member 33, the sealing member 33 moves, the peripheral surface of the sealing member 33 abuts against the side wall of the first inner cavity, and the sealing member 33 isolates the first sub-cavity 3111 and the second sub-cavity 3112 again. Then the first driving member 36 drives the first operating part 352 to move, the first operating part 352 drives the first abutting top part 351 to move, the first abutting top part 351 withdraws from the opening of the accommodating cavity 3113, the elastic member 39 provides elastic force to the limit valve 34, the elastic member 39 drives the limit valve 34 to withdraw from the accommodating cavity 3113, and the limit valve 34 abuts against the sealing member 33. Then the second driving member 38 drives the second operating part 372 to move, the second operating part 372 drives the second abutting top part 371 to move, so that the second push member 37 moves and resets.

[0062] See also Figures 7 to 9 The exhaust device 200 is a battery 100, and the battery 100 includes but is not limited to soft-pack batteries, blade batteries, square batteries, cylindrical batteries, prismatic batteries, etc., and is also suitable for various battery packs and battery electrical devices.

[0063] In the battery, a certain amount of gas is produced by chemical or electrochemical reactions between the electrode material and the electrolyte inside the battery shell. With the continuous use of the battery, the gas production and gas production rate inside the battery are getting faster and faster. On the one hand, the battery shell is usually a closed design, and the space reserved inside the battery shell is limited. During use, if the generated gas cannot be removed in time, it is easy to cause the air pressure inside the battery shell to be too high. The battery shell is prone to structural deformation or even damage due to gas production, which causes safety problems. On the other hand, as the air pressure inside the battery shell continues to rise, the gas will push open the explosion-proof valve, and the electrolyte and other substances inside the battery shell may be discharged with the gas, which will cause irreversible performance degradation of the battery. The battery may have the risk of short circuit, short circuit or even spontaneous combustion and explosion. On the third hand, the stress generated by the gas may cause damage to the electrode assembly, thereby affecting the electrical performance and cycle life of the battery.

[0064] The battery 100 provided in the embodiment of the present application includes a shell 10, an electrode assembly 20 and a venting mechanism 30, wherein the electrode assembly 20 includes a pole core 21, the pole core 21 is made of an electrode material, and the venting mechanism 30 is used to discharge the gas inside the battery 100. The shell 10 is provided with a second inner cavity 101, and the electrolyte and the pole core 21 are arranged in the second inner cavity 101. The shell 31 and the shell 10 are fixedly connected. Among them, the shell 31 is arranged opposite to the liquid level of the electrolyte, that is, the hole wall surface of the connecting hole 312 is arranged opposite to the liquid level of the electrolyte, so as to avoid the electrolyte blocking the connecting hole 312.

[0065] During the calendar use of the battery 100, the electrolyte and the pole core 21 undergo chemical or electrochemical reactions, and a certain amount of gas is generated in the second inner cavity 101. With the continuous use of the battery 100, the gas production amount and gas production rate of the second inner cavity 101 become faster and faster, and the air pressure value of the second inner cavity 101 gradually increases until the gas in the second inner cavity 101 increases the air pressure of the second inner cavity 101 to a preset range, and the gas in the second inner cavity 101 can drive the seal 33 to move, so that the peripheral surface of the seal 33 and the side wall of the first inner cavity 311 have a gap 314, and the exhaust hole 313, the gap 314 and the connecting hole 312 are connected to each other, so that the gas in the second inner cavity 101 is discharged through the exhaust hole 313.

[0066] In the battery 100 provided in the present application, the gas in the second inner cavity 101 can be discharged in time through the exhaust mechanism 30. On the one hand, the outer shell 10 of the battery 100 can be prevented from being deformed due to gas generation, and the structural damage to the battery 100 can be avoided, thereby improving the safety performance of the battery 100; on the other hand, the stress generated by the gas can be prevented from damaging the electrode assembly 20, which is beneficial to improving the electrical performance and cycle life of the battery 100.

[0067] For the convenience of description, the Y-axis direction is defined as the thickness direction of the battery 100, the Z-axis direction is defined as the height direction of the battery 100, and the X-axis is defined as the length direction of the battery 100, and the X-axis, Y-axis, and Z-axis are perpendicular to each other. The directional words such as "up", "top", "bottom", "bottom", "left", and "right" mentioned in the description of the embodiments of the present application are described based on the directions shown in the accompanying drawings, with the positive direction of the Z-axis being "up" and "top", the negative direction of the Z-axis being "bottom", the positive direction of the X-axis being "right", and the negative direction of the X-axis being "left", which does not form a limitation on the battery 100 in the actual application scenario. The "same", "equal", "consistent", or "parallel" used herein are all allowed to have a certain tolerance.

[0068] In the embodiment of the present application, the housing 10 includes two end walls, two side walls, a first bottom wall 107 and a first top wall 108. The two end walls are respectively a first end wall 103 and a second end wall 104, and the two side walls are respectively a first side wall 105 and a second side wall 106. The first end wall 103 and the second end wall 104 are opposite to each other along the Y-axis direction, the first side wall 105 and the second side wall 106 are opposite to each other along the X-axis direction, and the first bottom wall 107 and the first top wall 108 are opposite to each other along the Z-axis direction. The first side wall 105 and the second side wall 106 are both perpendicular to the first end wall 103, the second end wall 104 and the first end wall 103 are parallel to each other, the edge of the first bottom wall 107 sequentially connects the first end wall 103, the first side wall 105, the second end wall 104 and the second side wall 106 at one end along the negative direction of the Z axis, the first bottom wall 107, the first end wall 103, the first side wall 105, the second end wall 104 and the second side wall 106 enclose a second inner cavity 101 of the shell 10, the first end wall 103, the first side wall 105, the second end wall 104 and the second side wall 106 at one end along the positive direction of the Z axis form an opening, the above opening is connected to the second inner cavity 101 of the shell 10, the edge of the first top wall 108 sequentially connects the first end wall 103, the first side wall 105, the second end wall 104 and the second side wall 106 at one end along the positive direction of the Z axis to block the above opening.

[0069] The housing 10 is a rectangular structure, the battery 100 is a square battery, and the outer surface of the housing 10 is regular, so that the structure of the battery 100 is more compact, and multiple batteries can be connected in sequence conveniently. In other embodiments, the housing 10 can also be a cylindrical structure, a conical structure, or a structure of other shapes, and the battery 100 is a cylindrical battery, a conical battery, etc., which is not limited here.

[0070] In some embodiments, the housing 10 is provided with a liquid injection hole 109, which is provided on the first top wall 108 and passes through the upper surface and the lower surface of the first top wall 108. The electrolyte is injected into the second inner cavity 101 of the battery 100 through the liquid injection hole 109. The liquid injection hole 109 is used to install a sealing plug, and the sealing plug is used to block the liquid injection hole 109.

[0071] In some embodiments, the housing 10 is further provided with an explosion-proof hole 110, which is provided on the first top wall 108, and the explosion-proof hole 110 runs through the upper surface and the lower surface of the first top wall 108, and the explosion-proof hole 110 is used to install an explosion-proof valve and a protective sheet to prevent the battery 100 from exploding and improve the safety performance of the battery 100. The exhaust mechanism 30 can also be provided in the explosion-proof hole 110.

[0072] The electrode assembly 20 also includes two pole ears (not shown in the figure) and two pole posts. The two pole ears include a positive pole ear and a negative pole ear, and the positive pole ear and the negative pole ear are respectively fixedly connected to the pole core 21. The two pole posts are respectively a positive pole post 231 and a negative pole post 232, one end of the positive pole post 231 is connected to the positive pole ear, and the other end of the positive pole post 231 extends out of the shell 10, and the other end of the positive pole post 231 can be connected to the negative pole post of other batteries; one end of the negative pole post 232 is connected to the negative pole ear, and the other end of the negative pole post 232 extends out of the shell 10, and the other end of the negative pole post 232 can be connected to the positive pole post of other batteries.

[0073] Please combine Figure 4 The housing 31 includes a second top wall 315, a second bottom wall 316 and a peripheral wall 317. The second top wall 315 and the second bottom wall 316 are spaced and opposite to each other along the height direction of the battery 100. The second top wall 315 is arranged in the positive direction of the Z axis relative to the second bottom wall 316. The side of the peripheral wall 317 along the positive direction of the Z axis is connected to the edge of the second top wall 315. The side of the peripheral wall 317 along the negative direction of the Z axis is connected to the edge of the second bottom wall 316. The second top wall 315, the second bottom wall 316 and the peripheral wall 317 enclose a first inner cavity 311. The housing 31 of this embodiment is a cylindrical structure. In other embodiments, the housing 31 can also be a rectangular structure, a conical structure or other structures, which are not limited here.

[0074] In the embodiment of the present application, the first top wall 108 of the housing 10 and the second top wall 315 of the shell 31 are fixedly connected, and the first top wall 108 and the second top wall 315 are abutted against each other and sealed. The exhaust hole 313 is provided on the first top wall 108 and the second top wall 315, and the exhaust hole 313 passes through the first top wall 108 and the second top wall 315. The connecting hole 312 is provided on the second bottom wall 316, and the connecting hole 312 passes through the second bottom wall 316. Of course, the connecting hole 312 can also be provided on the peripheral wall 317 of the shell 31, and the connecting hole 312 passes through the peripheral wall 317. Along the height direction of the battery 100, the hole wall surface of the connecting hole 312 is provided in the negative direction of the Z axis relative to the sealing member 33.

[0075] In other embodiments, the first top wall 108 of the housing 10 and the second bottom wall 316 of the shell 31 are fixedly connected, and the first top wall 108 and the second bottom wall 316 are abutted against each other and sealed. The connecting hole 312 is provided on the first top wall 108 and the second bottom wall 316, and the connecting hole 312 passes through the first top wall 108 and the second bottom wall 316. The exhaust hole 313 is provided on the second top wall 315, and the exhaust hole 313 passes through the second top wall 315. Of course, the exhaust hole 313 can also be provided on the peripheral wall 317 of the shell 31, and the exhaust hole 313 passes through the peripheral wall 317. Along the height direction of the battery 100, the hole wall surface of the exhaust hole 313 is provided in the positive direction of the Z axis relative to the sealing member 33.

[0076] In other embodiments, the first top wall 108 of the housing 10 is provided with a mounting hole, and the housing 31 is fixed to the mounting hole, that is, the outer side wall of the housing 31 abuts against the hole wall surface of the mounting hole and is sealed. The exhaust hole 313 is provided on the second top wall 315, and the exhaust hole 313 passes through the second top wall 315. The connecting hole 312 is provided on the second bottom wall 316, and the connecting hole 312 passes through the second bottom wall 316. Of course, the connecting hole 312 can also be provided on the peripheral wall 317 of the housing 31, and the connecting hole 312 passes through the peripheral wall 317. Along the height direction of the battery 100, the hole wall surface of the connecting hole 312 is set in the negative direction of the Z axis relative to the sealing member 33. The exhaust hole 313 can also be provided on the peripheral wall 317 of the housing 31, and the exhaust hole 313 passes through the peripheral wall 317. Along the height direction of the battery 100, the hole wall surface of the connecting hole 312 is set in the positive direction of the Z axis relative to the sealing member 33.

[0077] The batteries provided in the embodiments of the present application include but are not limited to blade batteries, cylindrical batteries, square batteries, etc. In order to further compare the use effect of the present application, the present application is implemented by illustrative cases of different types of batteries by conditions such as whether an exhaust mechanism is set and air pressure difference. The above-mentioned air pressure difference refers to the difference between the internal air pressure value of the battery and the standard atmospheric pressure value. The greater the air pressure difference, the greater the internal air pressure value of the battery.

[0078] The exhaust mechanism provided in the embodiments of the present application is applicable to various positive and negative electrode systems. The embodiments of the present application respectively select lithium iron manganese phosphate batteries and ternary lithium batteries for simultaneous evaluation. These embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0079] During the battery test, the battery cycle life is tested according to the test method of cycle life in GB / T 31486-2015. The test environment is 45°C high temperature conditions. A full charge and discharge of the battery is considered as one cycle. The capacity retention rate is calculated by dividing the discharge capacity of each cycle by the discharge capacity of the first cycle. The direct current internal resistance (DCIR) test is to discharge the battery to 50% SOC and then discharge it at 1.5C for 30s. The DCIR value is calculated as 1.5C The difference between the final discharge voltage E2 of 30s and the final standby voltage E1 before 1.5C discharge is divided by the current value of 1.5C, and the DCIR growth rate = (DCIR1-DCIR0) / DCIR0*100, where DCIR0 is the initial DCIR value, and DCIR1 is the DCIR value at the end of the test. The internal air pressure value of the battery equipped with an exhaust mechanism is obtained according to the collection of the sensing component, and the designated battery is exhausted under a certain air pressure value condition according to the air pressure value collected by the sensing component. There is no data on the internal air pressure value of the battery not equipped with an exhaust mechanism. It should be understood that the battery in the comparative example is not equipped with an exhaust mechanism, and the air pressure difference in the battery in the comparative example should be greater than the air pressure difference in the battery in the embodiment.

[0080] Examples 1 to 10, Comparative Examples 1 and 2 are based on ternary lithium batteries. In Examples 1 to 5 and Comparative Example 1, the exhaust mechanism is applied to square batteries, while in Examples 6 to 10 and Comparative Example 2, the exhaust mechanism is applied to cylindrical batteries.

[0081] Table 1 Electrical performance test of the embodiments and comparative examples in ternary lithium batteries

[0082]

[0083]

[0084] Examples 11 to 15 and Comparative Example 3 use lithium manganese iron phosphate battery materials as research objects, and the exhaust mechanism is applied to square batteries.

[0085] Table 2 Electrical performance test of the embodiments and comparative examples in lithium manganese iron phosphate batteries

[0086]

[0087] Tables 1 and 2 show that, whether it is a square battery or a cylindrical battery, whether it is a ternary lithium battery or a lithium iron manganese phosphate battery, the gas production inside the battery has a very important impact on the electrical performance of the battery. The greater the difference in the gas pressure inside the battery, the faster the battery capacity retention rate decays and the faster the DCIR increases. This result is mainly due to the fact that the generated gas is stored inside the battery and continues to accumulate, resulting in a large pressure stress on the electrode assembly, which easily damages the surface structure of the electrode assembly, thereby reducing the electrical performance of the battery.

[0088] An embodiment of the present application further provides a battery pack, which includes a pack body and a plurality of batteries 100 , wherein the plurality of batteries 100 are connected in sequence and installed in the pack body.

[0089] The embodiment of the present application also provides an electric energy device, which includes a battery pack, and the battery pack is used to power the electric energy device. For example, the electric energy device can be a vehicle, and the battery pack is used to power the controller of the vehicle. The battery pack can also be used to power the central control display screen of the vehicle or the audio equipment of the vehicle. The electric energy device can also be an aircraft, a ship, an energy storage cabinet or other equipment, which is not limited by the embodiment of the present application.

[0090] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea.

Claims

1. An exhaust mechanism, characterized in that: The exhaust mechanism is used to exhaust the equipment (200) to be exhausted; the exhaust mechanism (30) comprises a shell (31) and a sealing member (33); the shell (31) is provided with a connecting hole (312), a first inner cavity (311) and an exhaust hole (313); the connecting hole (312), the first inner cavity (311) and the exhaust hole (313) are in communication; the first inner cavity (311) is in communication with the inner cavity of the equipment (200) to be exhausted through the connecting hole (312), and the first inner cavity (311) is in communication with the outside through the exhaust hole (313); the sealing member (33) is arranged in the first inner cavity (311), and the peripheral surface of the sealing member (33) abuts against the side wall of the first inner cavity (311) to seal at least a part of the first inner cavity (311); When the gas in the inner cavity of the device to be exhausted (200) increases so that the gas pressure in the inner cavity of the device to be exhausted (200) increases to a preset range, the sealing member (33) moves so that a gap (314) is formed between the peripheral surface of the sealing member (33) and the side wall of the first inner cavity (311), so that the gas is exhausted through the exhaust hole (313).

2. The exhaust mechanism according to claim 1, characterized in that: The sealing member (33) separates the first inner cavity (311) into a first sub-cavity (3111) and a second sub-cavity (3112); the first sub-cavity (3111) is connected to the outside through the exhaust hole (313); and the second sub-cavity (3112) is connected to the inner cavity of the device to be exhausted (200) through the connecting hole (312).

3. The exhaust mechanism according to claim 2, characterized in that: The exhaust mechanism further comprises a limit valve (34) and a first push member (35); the limit valve (34) and at least a portion of the first push member (35) are arranged in the first sub-cavity (3111); the limit valve (34) abuts between the first push member (35) and the sealing member (33); and a receiving cavity (3113) is concavely provided on a side wall of the first sub-cavity (3111); When the air pressure in the inner cavity of the exhaust device (200) increases to a preset range, the first push member (35) is used to push against the limit valve (34) so ​​that the limit valve (34) is accommodated in the accommodating cavity (3113) so that the sealing member (33) can move relative to the side wall of the first sub-cavity (3111).

4. The exhaust mechanism according to claim 3, characterized in that: A stop surface (3115) is provided inside the first inner cavity (311), and the stop surface (3115) is located on a side of the sealing member (33) facing away from the limit valve (34), and the stop surface (3115) abuts against the sealing member (33).

5. The exhaust mechanism according to claim 3, characterized in that: The first push member (35) comprises a first push top portion (351) and a first operating portion (352); the first push top portion (351) is arranged in the first sub-cavity (3111); the first operating portion (352) extends out of the first sub-cavity (3111) through the exhaust hole (313); the limit valve (34) is provided with a contact inclined surface (341); the first operating portion (352) is used to drive the first push top portion (351) to move, and the first push top portion (351) contacts the contact inclined surface (341) to enable the limit valve (34) to move and be accommodated in the accommodating cavity (3113).

6. The exhaust mechanism according to claim 5, characterized in that: The exhaust mechanism further comprises a first driving member (36), wherein the first driving member (36) is connected to the first operating part (352), and the first driving member (36) is used to drive the first operating part (352) to move.

7. The exhaust mechanism according to claim 2, characterized in that: The exhaust mechanism further comprises a sensing element (301), wherein the sensing element (301) is arranged in the second sub-cavity (3112), and the sensing element (301) is used to detect the air pressure value of the second sub-cavity (3112).

8. The exhaust mechanism according to claim 2, characterized in that: The exhaust mechanism also includes a second push member (37), at least a portion of which is disposed in the first sub-cavity (3111), and the second push member (37) can move toward the sealing member (33) to push against the sealing member (33) so that the sealing member (33) seals the second sub-cavity (3112).

9. The exhaust mechanism according to claim 8, characterized in that: The second push member (37) comprises a second push top portion (371) and a second operating portion (372); the second push top portion (371) is arranged in the first sub-cavity (3111); and the second operating portion (372) extends out of the first sub-cavity (3111) through the exhaust hole (313).

10. The exhaust mechanism according to claim 9, characterized in that: The exhaust mechanism also includes a second driving member (38), the second driving member (38) being connected to the second operating part (372), the second driving member (38) being used to drive the second operating part (372) to move, and the second operating part (372) drives the second abutting top part (371) to move, so that the second abutting top part (371) abuts against the sealing member (33).

11. The exhaust mechanism according to claim 3, characterized in that: The exhaust mechanism also includes an elastic member (39), and the elastic member (39) is located between the cavity side of the accommodating cavity (3113) and the limit valve (34); the elastic member (39) can provide elastic force to the limit valve (34) to drive the limit valve (34) to move out of the accommodating cavity (3113).

12. A battery, characterized in that: The battery comprises the exhaust mechanism according to any one of claims 1 to 11, and the exhaust mechanism is used to exhaust the gas inside the battery.

13. A battery pack, characterized in that: The battery pack includes a pack body and a plurality of batteries as claimed in claim 12, wherein the plurality of batteries are connected in sequence and installed in the pack body.

14. An electric energy device, characterized in that: The electric energy device comprises the battery pack as claimed in claim 13, and the battery pack is used to supply power to the electric energy device.

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