CN220652068U - Shell assembly, battery monomer, battery and power consumption device - Google Patents

Abstract

The application relates to a housing assembly, a battery cell, a battery and an electric device, wherein a suppression part is arranged on the housing assembly and is configured to be capable of contacting with electrolyte inside the housing assembly and suppressing gas generation of the electrolyte when the pressure inside the housing assembly reaches a first threshold value. The suppression portion is arranged on the shell component, when the internal pressure of the battery monomer is overlarge and reaches a first threshold value, the suppression portion is in contact with electrolyte in the battery monomer and suppresses gas production of the electrolyte, and can quickly slow down or suppress continuous gas production of the electrolyte, so that the gas quantity in the battery monomer is fundamentally reduced, the internal pressure of the battery monomer is reduced, and the probability of expansion of the battery monomer caused by overlarge internal pressure of the battery monomer is reduced.

Description

Shell assembly, battery monomer, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to a shell component, a battery monomer, a battery and an electric device.

Background

In the use process of the battery cell, gas is generated when the electrolyte in the battery cell reacts, so that the internal pressure of the battery cell is increased. In order to release pressure from the battery cell, the probability of expansion of the battery cell due to an increase in internal pressure is reduced, and a pressure release mechanism is usually provided on the top cover of the battery cell.

However, the structure of the pressure release mechanism is complex, and after the pressure release mechanism is arranged, the probability that the top cover of the battery monomer enters the battery monomer due to insufficient sealing can be increased, so that the structural stability of the battery monomer is affected.

Disclosure of Invention

Accordingly, it is necessary to provide a case assembly, a battery cell, a battery, and an electric device for solving the problem that the top cover of the conventional battery cell is liable to cause air to enter the inside of the battery cell due to insufficient sealing.

In a first aspect, the present application provides a housing assembly for accommodating an electrode assembly, the housing assembly being provided with a suppression portion configured to be capable of contacting an electrolyte inside the housing assembly and suppressing gassing of the electrolyte when an internal pressure of the housing assembly reaches a first threshold.

Through the structure, when the pressure inside the shell component reaches the first threshold value, the electrolyte inside the shell component can smoothly contact with the inhibition part, and the electrochemical property of the electrolyte is changed through the inhibition part, so that the gas production of the electrolyte is inhibited, the gas production of the electrolyte is fundamentally reduced, the internal gas pressure of the battery is reduced, the probability of the expansion or even the expansion of the battery due to the overlarge internal gas pressure of the battery is reduced, and the structural stability of the battery is improved.

In some embodiments, the suppressing portion includes a receiving chamber and a suppressing agent, the suppressing agent being received in the receiving chamber and capable of suppressing gas generation of the electrolyte;

wherein the containment chamber is configured to enable the inhibitor to enter the interior of the housing assembly when the pressure within the housing assembly reaches a first threshold.

In the above structure, when the pressure inside the housing assembly reaches the first threshold value, the accommodation chamber communicates with the inside of the housing assembly. On the one hand, the accommodating cavity can accommodate a part of gas in the shell assembly, so that a certain pressure relief effect is realized. On the other hand, when a part of the gas in the housing assembly enters the accommodating cavity, a part of the inhibitor in the accommodating cavity can be replaced, so that the inhibitor reacts with the electrolyte in the housing assembly, and further gas generation of the electrolyte is inhibited. Therefore, the inhibitor is matched with the accommodating cavity, so that pressure release inside the shell assembly can be realized, and continuous gas production of electrolyte inside the shell assembly can be inhibited, thereby improving the structural stability of the battery cell.

In some embodiments, the suppression portion further includes a first venting member configured to release the inhibitor within the containment chamber to the interior of the housing assembly when the housing assembly interior pressure reaches a first threshold.

Through first pressure release piece, can make the shell subassembly smoothly with hold the chamber intercommunication when self internal pressure reaches first threshold to release and hold the inside inhibitor of intracavity to the shell subassembly, the inhibitor can restrain electrolyte and continue the gas production with the inside electrolyte reaction of shell subassembly.

In some embodiments, the housing assembly includes a case in which the electrode assembly is received, and a top cover covering the case;

wherein, hold the chamber and form in the top cap inside.

Through the structure, when the internal pressure of the shell reaches the first threshold value, the accommodating cavity can be communicated with the interior of the shell at the first time under the action of the internal air pressure of the shell, so that the gas in the shell and the inhibitor in the accommodating cavity are rapidly replaced, and pressure relief and gas production inhibition are realized.

In some embodiments, the strength of the containment chamber walls is not less than the strength of the housing. Therefore, after the gas in the shell enters the accommodating cavity, the probability of cracking of the accommodating cavity due to overlarge pressure can be reduced, and the structural strength of the accommodating cavity is improved.

In some embodiments, a side wall of the accommodating cavity facing the interior of the housing is provided with a first opening, the first pressure release member is arranged at the first opening in a sealing manner, and the first pressure release member is configured to be ruptured when the pressure in the interior of the housing reaches a first threshold value so as to release the inhibitor in the accommodating cavity into the interior of the housing through the first opening.

Through the structure, when the internal pressure of the shell is lower than a first threshold value, the internal part of the shell is isolated from the accommodating cavity through the first pressure relief piece. When the pressure in the shell reaches or is higher than a first threshold, the first pressure release piece can be rapidly broken under the action of the pressure, so that the shell is communicated with the accommodating cavity, and the gas in the shell and the inhibitor in the accommodating cavity can be rapidly replaced, so that pressure release and gas production inhibition are realized.

In some embodiments, the housing assembly further includes a second venting member configured to be actuatable to vent the housing assembly internal pressure when the housing assembly internal pressure reaches a second threshold;

wherein the first threshold is less than the second threshold.

Through setting up the second pressure release piece to the second threshold value of second pressure release piece is greater than first threshold value, makes the inside pressure of shell subassembly at first carry out preliminary pressure release through holding the chamber, and the inside gas of shell subassembly is replaced with holding intracavity inhibitor, makes smooth reaction between the inside electrolyte of inhibitor and shell subassembly in order to restrain electrolyte gas production. In addition, the second venting member may be configured to further vent the housing assembly as the pressure within the housing assembly continues to increase and reach a second threshold.

In a second aspect, the present application also provides a battery cell including a housing assembly as described above and an electrode assembly housed inside the housing assembly.

In a third aspect, the present application also provides a battery comprising a battery cell as described above.

In a fourth aspect, the present application also provides an electrical device comprising a battery as described above.

Above-mentioned shell subassembly, battery monomer, battery and power consumption device sets up the suppression portion on shell subassembly, and when the inside pressure of battery monomer is too big to reach first threshold value, the suppression portion contacts with the inside electrolyte of battery monomer and suppresses electrolyte gas production, can slow down or suppress the electrolyte to continue to produce gas rapidly, fundamentally reduces the inside gas volume of battery monomer, reduces the inside atmospheric pressure of battery monomer, thereby reduces the probability that the battery monomer leads to the battery monomer to expand because of inside atmospheric pressure is too big.

Drawings

Fig. 1 is a schematic structural view of a battery cell according to one or more embodiments.

FIG. 2 is a top view of a top cover according to one or more embodiments.

FIG. 3 is a side cross-sectional view of a top cover according to one or more embodiments.

Fig. 4 is a partial enlarged view at a in fig. 3.

Reference numerals illustrate: 100. a battery cell; 10. a housing assembly; 20. an electrode assembly; 11. a suppressing section; 12. a housing; 13. a top cover; 14. a second pressure relief piece; 111. a receiving chamber; 112. a first pressure relief piece; 113. a first opening; 114. a liquid injection hole; 131. and a second opening.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that these terms "first," "second," if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

It will be understood that if an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and other fields. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

The battery is composed of one or more battery monomers which are connected in series or in parallel or in series-parallel connection, wherein the series-parallel connection refers to both series connection and parallel connection. The battery cell is the smallest unit constituting the battery, and the battery cell further includes a case, a top cap, and an electrode assembly. The case and the top cover enclose together to form a closed environment for accommodating an electrode assembly, which is a component of the electrochemical reaction occurring in the battery cell. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet.

When the electrode assembly is accommodated in a closed environment formed by the case and the top cover, it is necessary to fill the inside of the case with an electrolyte and allow the electrolyte to sufficiently infiltrate the electrode assembly so that the electrode assembly can undergo an electrochemical reaction.

In the use process of the battery cell, with the occurrence of electrochemical reaction, a large amount of gas is generated in the electrolyte inside the battery cell in the reaction process, so that the internal pressure of the battery cell is increased. When the cell internal pressure increases to a certain threshold, the cell may be expanded.

Based on this, it is generally necessary to provide a pressure release mechanism in the structure of the battery cell, and when the internal pressure of the battery cell is too high, the pressure release mechanism can be opened under the action of air pressure, thereby realizing the pressure release inside the battery cell.

However, when the gas inside the battery cell is discharged from the pressure release mechanism, the electrolyte inside the battery cell also follows the gas to be discharged from the pressure release mechanism, resulting in leakage of the electrolyte or pollution to other battery cells around which the battery cell normally operates. In order to reduce the probability of electrolyte flushing out and contaminating other battery cells, a check valve with a complex structure is usually required to be adopted in the structure of a pressure release mechanism on the battery cell. The introduction of the check valve with a complex structure can increase the risk that the external air flows into the battery cell due to insufficient sealing of the pressure release mechanism, and the structural stability of the battery cell is affected.

In order to solve the problem that the pressure release mechanism is used for realizing the pressure release inside the battery monomer in the current battery monomer structure, the air tightness inside the battery monomer is easily influenced due to the fact that the pressure release mechanism is complex in structure, so that external air is caused to flow into the battery monomer, one or more embodiments of the application provide a shell component, a suppression part is arranged on the shell component, when the internal pressure of the battery monomer is overlarge and reaches a first threshold value, the suppression part is in contact with electrolyte inside the battery monomer and suppresses the gas production of the electrolyte, the gas production of the electrolyte can be rapidly slowed down or suppressed, the gas quantity inside the battery monomer is fundamentally reduced, the internal air pressure of the battery monomer is reduced, and the probability of the expansion of the battery monomer caused by the overlarge internal air pressure of the battery monomer is reduced.

Referring to fig. 1 and 2, an embodiment of the present application provides a housing assembly 10 for accommodating an electrode assembly 20, where a suppressing portion 11 is disposed on the housing assembly 10, and the suppressing portion 11 is configured to be capable of contacting with an electrolyte inside the housing assembly 10 and suppressing gas generation of the electrolyte when a pressure inside the housing assembly 10 reaches a first threshold.

The case assembly 10 is a hollow case 12 structure that can be used to house the electrode assembly 20. The housing assembly 10 may include a housing 12 and a top cover 13, wherein the housing 12 is hollow, and an opening communicating with the interior of the housing 12 is formed in the housing 12. The top cover 13 may be hermetically disposed at the opening so as to form a closed environment for accommodating the electrode assembly 20 together with the inside of the case 12.

The suppressing portion 11 is a member that can react with the electrolyte after coming into contact with the electrolyte to change the electrochemical properties of the electrolyte, thereby achieving the effect of suppressing gas generation in the electrolyte. When the housing assembly 10 includes the case 12 and the top cover 13, the suppressing portion 11 may be disposed on the case 12, the top cover 13, or both the case 12 and the top cover 13. It will be appreciated that the specific setting position of the suppressing portion 11 may be adjusted according to the actual situation, so that when the pressure inside the housing assembly 10 reaches the first threshold, the electrolyte inside the housing assembly 10 can contact with the suppressing portion 11 more quickly and more conveniently, thereby suppressing the gas generation of the electrolyte.

Further, the first threshold value refers to a pressure value or a pressure range that enables the electrolyte inside the housing assembly 10 to contact the suppressing portion 11, that is, when the internal pressure of the housing assembly 10 reaches or exceeds the first threshold value, the electrolyte inside the housing assembly 10 can smoothly contact the suppressing portion 11, and the electrochemical properties of the electrolyte are changed by the suppressing portion 11, thereby achieving the purpose of suppressing gas generation of the electrolyte.

Through the above structure, when the pressure inside the housing assembly 10 reaches the first threshold, the electrolyte inside the housing assembly 10 can smoothly contact with the inhibition portion 11, and the electrochemical property of the electrolyte is changed by the inhibition portion 11, so that the gas production of the electrolyte is inhibited, the gas production of the electrolyte is fundamentally reduced, the internal air pressure of the battery cell 100 is reduced, the probability of the expansion of the battery cell 100 due to the excessive internal air pressure of the battery cell 100 is reduced, and the structural stability of the battery cell 100 is improved.

As shown in fig. 1, 2 and 3, in some embodiments, the suppressing portion 11 includes a receiving chamber 111 and a suppressing agent (not shown) that is received in the receiving chamber 111 and is capable of suppressing gas generation of the electrolyte. Wherein the receiving chamber 111 is configured to enable the inhibitor to enter the interior of the housing assembly 10 when the pressure within the housing assembly 10 reaches a first threshold.

The inhibitor is a substance that can be mixed with an electrolyte and react with the electrolyte to change the electrochemical properties of the electrolyte, thereby inhibiting gas generation in the electrolyte. The inhibitor can specifically realize the purpose of inhibiting gas production of the electrolyte by reacting with the electrolyte, increasing the consistency of the electrolyte, or increasing the migration resistance of lithium ions in the electrolyte.

In particular, the inhibitor may include one or more of a vinyl carbonate/dimethyl carbonate solution of lithium hexafluorophosphate, a vinyl carbonate/dimethyl carbonate solution of lithium tetrafluoroborate, silica. When the inhibitor is mixed with the electrolyte, the inhibitor reacts with the electrolyte, so that the gas production rate of the electrolyte can be slowed down, and the internal pressure of the battery cell 100 can be reduced. In addition, after the inhibitor reacts with the electrolyte, the performance of the battery cell 100 against impact short-circuit can be improved, and the conductivity of the battery cell 100 is reduced, so that the internal resistance of the battery cell 100 is changed, and the battery cell 100 with excessive internal pressure can be rapidly detected from the outside by measuring the resistance of the battery cell 100, thereby being accurately replaced.

Further, the accommodating chamber 111 may be formed inside the housing assembly 10, i.e., the accommodating chamber 111 is opened on the housing assembly 10. Of course, the receiving cavity 111 may be an external cavity structure independent of the housing assembly 10.

When the internal pressure of the housing assembly 10 reaches a first threshold, the receiving chamber 111 may be opened under the impact of the pressure, and the receiving chamber 111 communicates with the inside of the housing assembly 10. At this time, since the pressure inside the housing assembly 10 is greater than the pressure inside the accommodating chamber 111, part of the gas inside the housing assembly 10 enters into the accommodating chamber 111, and part of the inhibitor inside the accommodating chamber 111 is displaced.

A portion of the inhibitor entering the interior of the housing assembly 10 contacts and reacts with the electrolyte within the housing assembly 10, inhibiting gas production from the electrolyte, such that gas production from the electrolyte is reduced. At the same time, as the pressure inside the housing assembly 10 and the pressure inside the accommodating chamber 111 are gradually balanced, no displacement occurs between the gas inside the housing assembly 10 and the suppressant inside the accommodating chamber 111, so that an equilibrium state is formed inside the housing assembly 10 and inside the accommodating chamber 111.

As the cell 100 continues to circulate, the pressure within the cell 100 periodically increases or decreases as the expansion force changes, and during each cycle, when a differential air pressure develops between the interior of the housing assembly 10 and the receiving chamber 111, a portion of the air within the housing assembly 10 will enter the receiving chamber 111, displacing a portion of the inhibitor until all of the inhibitor within the receiving chamber 111 enters the interior of the housing assembly 10.

In the above-described structure, when the pressure inside the housing assembly 10 reaches the first threshold value, the accommodation chamber 111 communicates with the inside of the housing assembly 10. In one aspect, the receiving cavity 111 is capable of receiving a portion of the gas in the housing assembly 10 to achieve a certain pressure relief. On the other hand, when a part of the gas in the housing assembly 10 enters the accommodating chamber 111, a part of the inhibitor in the accommodating chamber 111 can be replaced, so that the inhibitor reacts with the electrolyte in the housing assembly 10, and the electrolyte is inhibited from continuously generating gas. Therefore, the inhibitor and the accommodating cavity 111 are matched with each other, so that the pressure release inside the housing assembly 10 can be realized, and the electrolyte inside the housing assembly 10 can be inhibited from continuously generating gas, thereby improving the structural stability of the battery cell 100.

Furthermore, the inhibitor may be in the form of a solid, liquid or gas. In order to improve the displacement efficiency between the inhibitor and the gas inside the housing assembly 10, the inhibitor may be provided as a liquid or gas having high fluidity, so that the inhibitor may be more smoothly displaced from the gas, thereby rapidly reacting with the electrolyte.

As shown in fig. 3 and 4, in some embodiments, the suppression portion 11 further includes a first venting member 112, the first venting member 112 being configured to release the suppression agent within the containment chamber 111 to the interior of the housing assembly 10 when the pressure within the housing assembly 10 reaches a first threshold.

Specifically, the first pressure release member 112 is a structure capable of isolating the interior of the housing assembly 10 from the accommodating chamber 111 when the pressure inside the housing assembly 10 does not reach the first threshold value, and communicating the interior of the housing assembly 10 with the accommodating chamber 111 when the pressure inside the housing assembly 10 reaches the first threshold value, so that the inhibitor in the accommodating chamber 111 can smoothly enter the interior of the housing assembly 10.

Further, the first venting member 112 may be a weakened portion formed on the wall of the housing cavity 111, such that when the pressure inside the housing assembly 10 reaches the first threshold value, the gas inside the housing assembly 10 can first flush the first venting member 112, thereby placing the housing cavity 111 in communication with the interior of the housing assembly 10, thereby releasing the inhibitor inside the housing cavity 111 into the interior of the housing assembly 10.

The first pressure relief member 112 may also be provided as another pressure relief structure, such as a pressure relief valve, which opens under the impact of the gas inside the housing assembly 10 when the pressure inside the housing assembly 10 reaches a first threshold value, thereby placing the accommodating chamber 111 in communication with the interior of the housing assembly 10, thereby releasing the inhibitor inside the accommodating chamber 111 to the interior of the housing assembly 10.

Through the first pressure release part 112, the housing assembly 10 can be smoothly communicated with the accommodating cavity 111 when the internal pressure of the housing assembly 10 reaches a first threshold value, so that the inhibitor in the accommodating cavity 111 is released to the interior of the housing assembly 10, and the inhibitor reacts with electrolyte in the housing assembly 10 to inhibit the electrolyte from continuously generating gas.

Referring again to fig. 1 and 3, in some embodiments, the housing assembly 10 includes a case 12 and a top cover 13, the electrode assembly 20 is accommodated in the case 12, and the top cover 13 covers the case 12. Wherein the receiving chamber 111 is formed inside the top cover 13.

Specifically, the case 12 and the top cover 13 together enclose a closed environment for accommodating the electrode assembly 20, and an electrolyte is filled inside the case 12 so that the electrode assembly 20 can be immersed in the electrolyte.

The tabs of the electrode assembly 20 are connected to the electrode terminals on the top cap 13, and are drawn out from the electrode terminals on the top cap 13. Therefore, the battery cell 100 is generally placed in a state in which the top cover 13 is upward during use. At this time, when the air pressure inside the case 12 reaches a first threshold value, the air first impinges on the top cover 13.

Based on this, in order to allow the housing 12 internal pressure to reach the first threshold value, the housing chamber 111 can communicate with the housing 12 interior more quickly, thereby releasing the inhibitor into the housing 12 interior more smoothly, and the housing chamber 111 is provided on the top cover 13. Specifically, the accommodating chamber 111 is opened inside the top cover 13, and the first pressure release member 112 is disposed toward the inside of the housing 12.

When the air pressure inside the casing 12 reaches the first threshold value, the air inside the casing 12 first impacts the first venting member 112 upward, so that the first venting member 112 is rapidly opened to communicate the inside of the casing 12 with the accommodating chamber 111. Therefore, the gas in the shell 12 can enter the accommodating cavity 111 at the first time and can be smoothly replaced with the inhibitor in the accommodating cavity 111, so that the purposes of pressure relief and gas generation inhibition are realized.

It will be appreciated that when the battery cell 100 is placed in other states (not with the top cover 13 facing upward), the receiving chamber 111 may also be formed in one of the upwardly disposed side walls of the housing 12, and the first venting member 112 may be disposed toward the interior of the housing 12, so that the first venting member 112 can timely open and release the inhibitor in the receiving chamber 111 when the pressure inside the housing 12 reaches the first threshold.

Through the above structure, when the internal pressure of the casing 12 reaches the first threshold, the accommodating cavity 111 can be communicated with the inside of the casing 12 at the first time under the action of the internal air pressure of the casing 12, so that the gas in the casing 12 and the inhibitor in the accommodating cavity 111 can be rapidly replaced, and pressure release and gas production inhibition can be realized.

In some embodiments, the strength of the cavity wall of the receiving cavity 111 is not less than the strength of the housing 12.

When the housing chamber 111 communicates with the inside of the housing 12, since the pressure inside the housing 12 is greater than the pressure inside the housing chamber 111, the gas inside the housing 12 enters the housing chamber 111, causing the pressure inside the housing chamber 111 to rapidly increase. Accordingly, the strength of the wall of the accommodating chamber 111 is set to be not smaller than the strength of the housing 12, so that the probability of cracking of the accommodating chamber 111 due to excessive pressure after the gas in the housing 12 enters the accommodating chamber 111 can be reduced, and the structural strength of the accommodating chamber 111 can be improved.

As shown in fig. 4, in some embodiments, a side wall of the accommodating chamber 111 facing the interior of the housing 12 is provided with a first opening 113, and the first venting member 112 is hermetically disposed in the first opening 113, and the first venting member 112 is configured to be able to rupture when the pressure inside the housing 12 reaches a first threshold value, so as to release the inhibitor inside the accommodating chamber 111 into the interior of the housing 12 through the first opening 113.

The first pressure relief piece 112 may be provided as a pressure relief piece or a pressure relief membrane and is sealingly provided at the first opening 113. Specifically, the first pressure relief piece 112 may be provided as an aluminum film or a copper film, but is not limited thereto. The first threshold value specifically refers to the burst pressure of the first relief 112, i.e., the first relief 112 ruptures at a pressure at or above the first threshold value.

When the internal pressure of the case 12 is lower than the first threshold value, the first venting member 112 is sealingly disposed at the first opening 113, thereby isolating the interior of the case 12 from the receiving chamber 111. When the pressure inside the casing 12 reaches or exceeds the first threshold, the first pressure release member 112 is ruptured by the pressure, and communication between the inside of the casing 12 and the accommodation chamber 111 is achieved through the first opening 113.

At this time, a part of the gas in the case 12 enters the accommodating chamber 111 under the action of the air pressure difference, so that the inhibitor in a part of the accommodating chamber 111 is replaced, and the pressure release is realized, and the inhibitor reacts with the electrolyte in the case 12 to inhibit the gas generation of the electrolyte.

With the above structure, the inside of the case 12 is isolated from the accommodation chamber 111 by the first pressure release member 112 when the pressure inside the case 12 is lower than the first threshold value. When the pressure inside the casing 12 reaches or exceeds the first threshold, the first pressure release member 112 can be rapidly ruptured under the pressure action, so as to communicate the inside of the casing 12 with the containing cavity 111, and the gas inside the casing 12 and the inhibitor in the containing cavity 111 can be rapidly replaced, thereby realizing pressure release and inhibiting gas production.

In addition, a liquid injection hole 114 is further formed in a side wall of the accommodating cavity 111, which faces away from the inside of the shell 12, and a sealing element is arranged in the liquid injection hole 114 in a sealing manner. The filling hole 114 is used for filling the inhibitor into the accommodating cavity 111, and after the inhibitor is filled, the sealing member is sealed and arranged in the filling hole 114, so that a sealed space is formed in the accommodating cavity 111.

As shown in fig. 3, in some embodiments, the housing assembly 10 further includes a second venting member 14, the second venting member 14 being configured to be actuated to vent the housing assembly 10 internal pressure when the housing assembly 10 internal pressure reaches a second threshold. Wherein the first threshold is less than the second threshold.

The second venting member 14 may be configured as a rupture disc located on the top cover 13, and in particular, a second opening 131 may be formed in the top cover 13, and the second venting member 14 is sealingly disposed in the second opening 131. The second threshold value specifically refers to the burst pressure of the second venting member 14, i.e., the second venting member 14 ruptures at a pressure at or above the second threshold value.

When the internal pressure of the casing 12 is lower than the second threshold value, the second pressure relief piece 14 is sealingly disposed at the second opening 131. When the pressure inside the casing 12 reaches or exceeds the first threshold, the second pressure release member 14 is ruptured by the pressure so that the inside of the casing 12 communicates with the outside through the second opening 131, thereby releasing the pressure inside the casing 12.

Further, since the first threshold is smaller than the second threshold, that is, the pressure inside the casing 12 will reach the first threshold first, the first venting member 112 will break first, so that a portion of the gas inside the casing 12 and a portion of the inhibitor inside the containing cavity 111 will be displaced, so that on one hand, the venting inside the casing 12 is achieved, and on the other hand, the inhibitor reacts with the electrolyte inside the casing 12 to inhibit the gas production of the electrolyte.

After the inhibitors in the receiving chamber 111 all enter the interior of the case 12 and all react with the electrolyte, if the battery cell 100 continues to circulate, its internal pressure continues to increase to the second threshold, the second pressure relief piece 14 actuates and relieves the pressure inside the housing assembly 10.

Specifically, the second pressure relief 14 and the accommodation chamber 111 are provided independently of each other, i.e., the second pressure relief 14 and the accommodation chamber 111 do not interfere with each other. Thus, when the pressure inside the casing 12 reaches the second threshold, the second pressure relief piece 14 can operate normally and achieve pressure relief inside the casing 12.

By providing the second venting member 14, and the second threshold of the second venting member 14 is greater than the first threshold, the pressure inside the housing assembly 10 can be initially relieved through the accommodating cavity 111, and the gas inside the housing assembly 10 is replaced with the inhibitor inside the accommodating cavity 111, so that the inhibitor reacts smoothly with the electrolyte inside the housing assembly 10 to inhibit the gas production of the electrolyte. In addition, the second venting member 14 may be capable of further venting the housing assembly 10 as the pressure within the housing assembly 10 continues to increase and reach a second threshold.

As shown in fig. 1, based on the same concept as the above-described case assembly 10, the present application also provides a battery cell 100 including the case assembly 10 as described above and an electrode assembly 20 accommodated inside the case assembly 10.

Based on the same concept as the battery cell 100 described above, the present application also provides a battery including the battery cell 100 described above.

Based on the same concept as the above battery, the present application provides an electric device including the battery as described above.

According to one or more embodiments, the internal pressure of the battery cell 100 gradually increases as the battery cell 100 is used. When the internal pressure of the battery cell 100 reaches a first threshold value, the first venting member 112 is first ruptured by the impact of the gas, placing the receiving chamber 111 in communication with the interior of the case 12. Since the pressure inside the housing 12 is greater than the pressure inside the accommodating chamber 111, a part of the gas inside the housing 12 enters the accommodating chamber 111 by the pressure difference, so that a part of the inhibitor inside the accommodating chamber 111 is displaced inside the housing 12. Thereby, the pressure of a part of the gas in the case 12 is released.

A part of the inhibitor entering the inside of the casing 12 reacts with the electrolyte inside the casing 12 to inhibit the gas production of the electrolyte, so that the gas production of the electrolyte is reduced. At the same time, as the pressure inside the housing 12 and the pressure inside the accommodating chamber 111 are gradually balanced, no displacement is performed between the gas inside the housing 12 and the inhibitor inside the accommodating chamber 111, and the inside of the housing 12 and the inside of the accommodating chamber 111 are in an equilibrium state.

As the cell 100 continues to circulate, the pressure inside the cell 100 periodically increases or decreases with the expansion force, and during each cycle, when a pressure difference is formed between the inside of the housing 12 and the accommodating chamber 111, a portion of the gas inside the housing 12 enters the accommodating chamber 111, thereby displacing a portion of the inhibitor until all of the inhibitor in the accommodating chamber 111 enters the inside of the housing 12.

At this time, if the battery cell 100 continues to circulate, the internal pressure of the battery cell 100 continues to increase, and when the second threshold is reached, the second pressure release member 14 is actuated to release the pressure inside the housing 12, so as to realize further pressure release of the battery cell 100, thereby reducing the probability of expansion of the battery cell 100 due to excessive internal pressure.

Furthermore, one or more embodiments of the present application include at least the following benefits:

1. when the accommodating cavity 111 is communicated with the inside of the shell 12, as the pressure inside the shell 12 is larger than the pressure inside the accommodating cavity 111, a part of gas inside the shell 12 enters the accommodating cavity 111 under the action of pressure difference, so that the preliminary pressure relief inside the shell 12 is realized;

2. after the inhibitor in the accommodating cavity 111 enters the shell 12, the inhibitor reacts with electrolyte in the shell 12, and the purposes of increasing the consistency of the electrolyte or increasing the migration resistance of lithium ions in the electrolyte are realized through the reaction, so that the gas production of the electrolyte is inhibited, and the pressure in the battery cell 100 is radically reduced;

3. when the inhibitor reacts with the electrolyte, the electrochemical property of the electrolyte is changed, so that the internal resistance state of the battery cell 100 can be changed, the internal pressure of the battery cell 100 is not required to be measured, and the battery cell 100 with excessive internal pressure can be rapidly identified by directly measuring the resistance of the battery cell 100, so that the battery cell can be accurately replaced.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. A housing assembly for housing an electrode assembly, the housing assembly having a suppression portion disposed thereon, the suppression portion being configured to be capable of contacting an electrolyte within the housing assembly and suppressing gassing of the electrolyte when an internal pressure of the housing assembly reaches a first threshold.

2. The housing assembly of claim 1, wherein the suppressing portion comprises a receiving cavity and a suppressing agent, the suppressing agent being received in the receiving cavity and capable of suppressing gas generation of the electrolyte;

wherein the containment chamber is configured to enable the suppressant to enter the enclosure assembly when the enclosure assembly internal pressure reaches the first threshold.

3. The housing assembly of claim 2, wherein the suppression portion further comprises a first venting member configured to release the inhibitor within the containment chamber to the interior of the housing assembly when the housing assembly interior pressure reaches the first threshold.

4. The housing assembly of claim 3, wherein the housing assembly comprises a case and a top cover, the electrode assembly being housed within the case, the top cover covering the case;

wherein, hold the chamber and form in the top cap is inside.

5. The housing assembly of claim 4, wherein the strength of the containment chamber walls is not less than the strength of the shell.

6. The housing assembly of claim 5, wherein a side of the receiving chamber facing the interior of the housing defines a first opening, the first pressure relief member being sealingly disposed in the first opening, the first pressure relief member being configured to rupture when the housing interior pressure reaches the first threshold to release the inhibitor within the receiving chamber into the housing interior through the first opening.

7. The housing assembly of claim 1, further comprising a second venting member configured to be actuatable to vent the housing assembly internal pressure when the housing assembly internal pressure reaches a second threshold;

wherein the first threshold is less than the second threshold.

8. A battery cell comprising the housing assembly of any one of claims 1-7 and an electrode assembly housed within the housing assembly.

9. A battery comprising the battery cell of claim 8.

10. An electrical device comprising the battery of claim 9.