Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment, and relates to the technical field of batteries. The battery pack comprises a battery monomer and an exhaust assembly, the battery monomer comprises a battery shell with a containing cavity and a battery cell, and the battery cell is arranged in the containing cavity; the exhaust assembly is arranged on one side of the battery shell and is independent from the battery monomers; the exhaust assembly communicates with the containing cavity and is used for releasing gas in the containing cavity. According to the embodiment of the invention, the gas in the accommodating cavity can be discharged in time, so that the gas is prevented from gathering in the accommodating cavity, the abnormal attenuation of the capacity of the single battery is prevented, and the performance and safety of the battery pack are improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of battery, in particular to a battery pack and an electric device. BACKGROUND

[0002] The battery pack is a device for converting chemical energy into electrical energy, which is widely used in new energy vehicles, energy storage power stations and other fields. The battery pack usually includes a shell and a plurality of battery monomers arranged in the shell. A plurality of battery monomers will generate a large amount of gas when working. The gas accumulation in the battery monomer will cause abnormal capacity attenuation of the battery monomer, increase the risk of early opening of the explosion-proof valve, and reduce the performance and safety of the battery monomer. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, embodiments of the present application provide a battery pack and an electric device, which can timely discharge the gas in the accommodation cavity, avoid the accumulation of gas in the accommodation cavity, prevent the abnormal capacity attenuation of the battery monomer, and further improve the performance and safety of the battery pack.

[0004] In order to achieve the above purpose, embodiments of the present application provide the following technical solutions:

[0005] The first aspect of the embodiments of the present application provides a battery pack, which comprises:

[0006] a battery monomer, the battery monomer comprising a battery shell having an accommodation cavity and an electric core, the electric core being arranged in the accommodation cavity;

[0007] an exhaust assembly arranged on one side of the battery shell and independently arranged with the battery monomer; wherein the exhaust assembly is in communication with the accommodation cavity and is used for releasing the gas in the accommodation cavity.

[0008] In a possible implementation manner, the exhaust assembly comprises a liquid supply member, the liquid supply member comprising an inlet and an outlet, the inlet and the outlet being in communication with the accommodation cavity; wherein the liquid supply member is provided with a supplementary electrolyte;

[0009] The supplementary electrolyte in the liquid supply member enters the accommodation cavity through the outlet, and the gas in the accommodation cavity enters the liquid supply member through the inlet.

[0010] In a possible implementation manner, the exhaust assembly further comprises a first flow channel and a second flow channel;

[0011] The outlet is in communication with the accommodation cavity through the first flow channel, and the inlet is in communication with the accommodation cavity through the second flow channel.

[0012] In a possible implementation, the exhaust assembly further comprises a driving member, which is arranged on the first flow channel and / or the second flow channel.

[0013] When the driving member is arranged on the first flow channel, the driving member is configured to drive the additional electrolyte in the liquid supply member.

[0014] When the driving member is arranged on the second flow channel, the driving member is configured to drive the gas in the accommodating cavity of the battery cell.

[0015] In a possible implementation, the driving member is arranged on the second flow channel. In a possible implementation, the battery pack further comprises a controller, which is connected to the driving member.

[0016] In a possible implementation, the battery cell further comprises a first pressure sensor, which is arranged on the battery shell and configured to detect the pressure of the accommodating cavity.

[0017] The first pressure sensor is connected to the controller, and the controller is configured to control the working state of the driving member according to the pressure value of the first pressure sensor.

[0018] In a possible implementation, the liquid supply member is provided with an exhaust one-way valve.

[0019] In a possible implementation, the battery cell comprises a plurality of battery cells, and the exhaust assembly is in communication with the accommodating cavity of each battery cell.

[0020] In a possible implementation, the battery cell comprises a positive electrode plate, a negative electrode plate, and a separator arranged between the positive electrode plate and the negative electrode plate.

[0021] The active material of the positive electrode plate comprises at least one of a lithium-rich lithium-iron material, a lithium-rich lithium-nickel material, a lithium-rich lithium-cobalt material, and a lithium-rich lithium-oxalate material.

[0022] A second aspect of the embodiments of the present application provides a use-electric device, which comprises: a use-electric device and the battery pack of the first aspect, the battery pack being electrically connected to the use-electric device and configured to provide electric energy for the use-electric device.

[0023] The battery pack and the electric equipment provided by the embodiment of the present application can realize the same function as the explosion-proof valve through the exhaust assembly, and the exhaust assembly can replace the explosion-proof valve, so that the risk of the explosion-proof valve of the battery monomer opening in advance in the related art does not occur, and the safety of the battery monomer is improved.

[0024] In addition to the technical problems solved by the embodiments of the present application, the technical features constituting the technical solutions, and the beneficial effects brought by the technical features, the other technical problems solved by the battery pack and the electric equipment provided by the embodiments of the present application, the other technical features included in the technical solutions, and the beneficial effects brought by the technical features will be further described in detail in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0026] Figure 1 Structure diagram of the battery pack provided by the embodiment of the present application Figure 1 ;

[0027] Figure 2 Structure diagram of the battery pack provided by the embodiment of the present application Figure 2 ;

[0028] Figure 3 Internal schematic diagram of the battery monomer provided by the embodiment of the present application.

[0029] Explanation of reference signs:

[0030] 100: battery monomer;

[0031] 110: battery shell; 111: accommodating cavity;

[0032] 120: liquid injection hole;

[0033] 130: positive pole;

[0034] 140: negative pole;

[0035] 150: first pressure sensor;

[0036] 160: electric core;

[0037] 200: exhaust assembly;

[0038] 210: liquid supply member;

[0039] 211: outlet;

[0040] 212: inlet;

[0041] 220: first flow channel;

[0042] 230: second flow channel;

[0043] 240: driving member;

[0044] 250: exhaust one-way valve;

[0045] 300: controller. DETAILED DESCRIPTION

[0046] As described in the background, the gas in the battery in the related art is easy to gather, resulting in abnormal capacity attenuation of the battery and early opening of the explosion-proof valve, reducing the performance and safety of the battery. The inventor has found that the reason for this problem is that, on the one hand, the electrolyte will decompose or the electrode material will have a side reaction during the high-temperature or charging and discharging process of the battery, causing the battery to generate gas; on the other hand, in order to prolong the service life of the battery, a lithium-rich material is added to the positive electrode material, and when the lithium-rich material slowly decomposes during the charging and discharging process of the battery, a large amount of gas will also be generated. If the above-mentioned gas gathers in the battery shell, it will cause abnormal capacity attenuation of the battery monomer and increase the risk of early opening of the explosion-proof valve of the battery monomer, reducing the performance and safety of the battery monomer.

[0047] To solve the above technical problems, the embodiments of the present application provide a battery pack and a power utilization device. The exhaust assembly is in communication with the containing cavity and is used to exhaust the gas generated when the battery cell is in a working state to the outside of the battery shell, avoiding the gathering of the gas in the containing cavity, preventing the abnormal capacity attenuation of the battery monomer, and improving the performance of the battery monomer. In addition, the exhaust assembly in the embodiments can achieve the same function as the explosion-proof valve, and the exhaust assembly can be used to replace the explosion-proof valve. In this way, the early opening of the explosion-proof valve of the battery monomer in the related art will not occur, and the safety of the battery monomer is improved.

[0048] In order to make the above objectives, characteristics and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0049] Please refer to the accompanying drawings Figure 1 and the accompanying drawings Figure 2 The embodiments of the present application provide a battery pack, which is used to provide electric energy for an electric device.

[0050] Please refer to the accompanying drawings Figure 3 The battery pack includes a battery monomer 100, and the battery monomer 100 includes a battery shell 110 and an electrode core 160, wherein the battery shell 110 is used to provide a containing space for the electrode core 160 and an electrolyte. For example, the battery shell 110 includes a containing cavity 111, and the electrode core 160 and the electrolyte are both arranged in the containing cavity 111. In the embodiment, the battery shell 110 can be a hollow cuboid, a square or a cylinder, and the material of the battery shell 110 can be aluminum or steel and its alloy, or a plastic material or an aluminum plastic film. The electrode core 160 will generate gas when it is in a working state. It should be understood that the working state can include a normal charging and discharging process, or a decomposition process of a lithium-rich material.

[0051] The electrode core 160 includes a positive electrode sheet, a negative electrode sheet and a separator, and the separator is arranged between the positive electrode sheet and the negative electrode sheet. The battery monomer mainly relies on the movement of metal ions (such as lithium ions) between the positive electrode sheet and the negative electrode sheet to provide electric energy. The material of the separator can be PP or PE, etc.

[0052] It should be noted that the active material of the positive electrode sheet in the embodiment can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc., or a lithium-rich material. For example, the active material of the positive electrode sheet includes at least one of a lithium-rich lithium iron phosphate material (Li5FeO4), a lithium-rich lithium nickelate material (Li2NiO2), a lithium-rich lithium cobaltate material (LiCoO2) and a lithium-rich lithium oxalate material (Li2C2O4). Alternatively, the active material of the positive electrode sheet can be one of the above materials, or a combination of two or more. For example, the active material of the positive electrode sheet is a lithium-rich lithium iron phosphate material (Li5FeO4), wherein the addition amount of the lithium-rich material is 0.3%-5%, i.e. lithium iron phosphate: lithium-rich material = 100:0.3-5, and the positive material and the positive lithium-rich material are coated on an aluminum foil as an active material to form a positive electrode sheet. 1+x CoO2) and a lithium-rich lithium oxalate material (Li2C2O4). Alternatively, the active material of the positive electrode sheet can be one of the above materials, or a combination of two or more. For example, the active material of the positive electrode sheet is a lithium-rich lithium iron phosphate material (Li5FeO4), wherein the addition amount of the lithium-rich material is 0.3%-5%, i.e. lithium iron phosphate: lithium-rich material = 100:0.3-5, and the positive material and the positive lithium-rich material are coated on an aluminum foil as an active material to form a positive electrode sheet.

[0053] The active material of the negative electrode is coated on the copper foil to form a negative electrode tab. Among them, the active material of the negative electrode can be graphite. A plurality of positive electrode tabs and a plurality of negative electrode tabs are alternately stacked in sequence, any adjacent positive electrode tab and negative electrode tab are separated by a separator, and after injecting an electrolyte, a lithium ion battery is formed.

[0054] In the embodiment, the above-mentioned material is used as the active material of the positive electrode tab, the lithium-rich material does not need to be decomposed at high pressure, and can be decomposed at a voltage lower than the upper limit of the battery use voltage 3.8V; on the one hand, the lithium-rich material in the battery charging and discharging process can slowly decompose and release active lithium, supplement the active lithium lost in the use process of the battery monomer, and prolong the service life of the battery monomer. On the other hand, the voltage of the battery pack during use is low, which can better protect the structural stability of the lithium-rich material during decomposition, and reduce the side reactions between the decomposition products of the lithium-rich material and the electrolyte.

[0055] Since the active material of the positive electrode tab does not decompose during the preparation of the battery monomer, but slowly decomposes and releases capacity during the use of the battery pack, on the one hand, the preparation of the battery monomer 100 can be compatible with the existing lithium battery production line, without the need for production line modification, thereby reducing the preparation cost of the battery monomer. On the other hand, when designing the excess ratio of the capacity of the negative electrode, the capacity of the lithium-rich material does not need to be calculated, which can reduce the amount of active material of the negative electrode tab and reduce the cost of the battery. It should be understood that the excess ratio in the embodiment = the capacity of the negative electrode tab per unit area / the capacity of the positive electrode tab per unit area (not including lithium-rich material) ≥1.10.

[0056] Please continue to refer to the accompanying Figure 1 The battery monomer 100 further comprises a liquid injection hole 120, which is arranged on the battery shell 110 and communicates with the accommodation cavity. In this way, the electrolyte can be injected into the accommodation cavity through the liquid injection hole 120.

[0057] It should be noted that the battery monomer 100 further comprises a sealing member (not shown in the figure), which is arranged in the liquid injection hole 120 and can effectively seal the liquid injection hole 120 to prevent the electrolyte from leaking from the liquid injection hole. This not only ensures the stability of the electrolyte in the battery monomer, but also avoids the pollution and damage of the electrolyte leakage to the external environment of the battery monomer. In addition, the sealing member can also prevent external air and moisture from entering the inside of the battery shell 110 through the liquid injection hole 120, thereby reducing the risk of unnecessary chemical reactions in the battery monomer, and improving the safety and reliability of the battery monomer.

[0058] The battery monomer 100 further comprises a positive pole 130 and a negative pole 140, the positive pole 130 is electrically connected with the positive pole tab of the battery cell, and the negative pole 140 is electrically connected with the negative pole tab of the battery cell to output electric energy. Wherein, the positive pole 130 and the negative pole 140 are both arranged in the battery shell 110 and oppositely arranged. In this way, the battery can be more easily electrically connected and installed in actual application, simplifying the battery assembly and maintenance process. The battery pack provided in the embodiment of the application further comprises an exhaust assembly 200, the exhaust assembly 200 is arranged on one side of the battery shell 110 and independently arranged with the battery monomer 100.

[0059] It should be noted that the independent arrangement in the embodiment can be understood as that the exhaust assembly 200 is an independent component and is not the explosion-proof valve of the battery monomer 100. In a possible example, the exhaust assembly 200 can be arranged on the battery shell 110, for example, can be connected with the battery shell 110 by means of sticking or adsorbing. In another possible example, the exhaust assembly 200 is not arranged on the battery shell 110, for example, the exhaust assembly 200 is arranged in a spaced manner with the battery shell 110.

[0060] The exhaust assembly 200 is in communication with the containing cavity 111 and is used for releasing the gas in the containing cavity 111 to discharge the gas generated when the battery cell 160 is in a working state to the outside of the battery shell 110, avoiding the gas gathering in the battery shell 110, thereby preventing the abnormal capacity attenuation of the battery monomer 100 and improving the performance of the battery monomer 100.

[0061] In addition, the exhaust assembly 200 can realize the same function as the explosion-proof valve in the embodiment, therefore, the explosion-proof valve can be replaced by the exhaust assembly 200, and the explosion-proof valve does not need to be arranged on the battery monomer, which can reduce the preparation cost of the battery monomer 100 and also can not appear the risk of the explosion-proof valve of the battery monomer being opened in advance in the related art, thereby improving the safety of the battery monomer 100.

[0062] Exemplarily, the exhaust assembly 200 comprises a liquid supply member 210, the liquid supply member 210 is provided with a supplementary electrolyte. For example, the liquid supply member 210 can comprise a liquid supply tank with an inner cavity, and the liquid supply tank is provided with a supplementary electrolyte.

[0063] Wherein, the liquid supply member 210 comprises an inlet 212 and an outlet 211, for example, the inlet 212 and the outlet 211 are oppositely arranged to attach the supplementary electrolyte. Figure 1 As an example of the orientation shown, the inlet 212 is arranged on the left side of the liquid supply member 210, and the outlet 211 is arranged on the right side of the liquid supply member 210.

[0064] The supplementary electrolyte in the liquid supply member 210 enters the containing cavity through the outlet 211, and the gas in the containing cavity enters the liquid supply member 210 through the inlet 212, so as to complete the replacement of the gas in the containing cavity of the battery shell 110. In this way, on the one hand, the electrolyte in the containing cavity of the battery shell 110 can be effectively supplemented, the sufficiency of the electrolyte is ensured, and the normal performance of the battery monomer 100 is maintained; on the other hand, while the supplementary electrolyte is added into the containing cavity, the gas generated inside the battery monomer 100 is also helped to be discharged, the gas is prevented from gathering in the containing cavity, and then the abnormal capacity attenuation of the battery monomer is prevented, the performance of the battery monomer is improved, and the risk that the explosion-proof valve of the battery monomer in the related art is opened in advance is also avoided, the safety of the battery monomer is improved, and then the safety of the battery pack is improved. On the other hand, the design of the liquid supply member 210 makes the supplement of the electrolyte and the discharge of the gas more convenient, simplifies the maintenance and maintenance process of the battery pack, and improves the maintainability of the battery pack.

[0065] In order to realize the communication between the outlet 211 and the containing cavity 111, and the communication between the inlet 212 and the containing cavity 111, the exhaust assembly 200 provided in the embodiment further includes a first flow pipe 220 and a second flow pipe 230.

[0066] The outlet 211 communicates with the containing cavity 111 through the first flow pipe 220, and the inlet 212 communicates with the containing cavity 111 through the second flow pipe 230. In the embodiment, the first flow pipe 220 communicates the outlet 211 of the liquid supply member 210 with the containing cavity 111, so that the supplementary electrolyte can be accurately delivered into the containing cavity of the battery shell 110, the effective supplement of the electrolyte is ensured, and the normal working performance of the battery monomer is maintained.

[0067] The second flow pipe 230 communicates the inlet 212 of the liquid supply member 210 with the containing cavity 111, so that the gas in the containing cavity 111 can be efficiently discharged into the liquid supply member 210, the replacement of the gas in the containing cavity 111 is realized, the gas is prevented from gathering, and the internal pressure of the battery shell 110 is reduced.

[0068] Please continue to refer to the accompanying drawings Figure 1 The exhaust assembly 200 provided in the embodiment further includes a driving member 240. The driving member 240 is arranged on the first flow pipe 220 and / or the second flow pipe 230. In an example, when the number of the driving member 240 is one, the driving member 240 is arranged on one of the first flow pipe 220 and the second flow pipe 230. For example, the driving member 240 is arranged on the second flow pipe 230. In another example, when the number of the driving member 240 is two, the two driving members 240 are arranged on the first flow pipe 220 and the second flow pipe 230 respectively. In addition, the driving member 240 can be a driving pump.

[0069] When the driving member 240 is arranged in the first flow channel 220, it is used to drive the supplement electrolyte in the liquid supply member 210. In this way, the driving member 240 can push the supplement electrolyte to enter the accommodating cavity 111 in time and effectively, improve the delivery efficiency of the supplement electrolyte, and ensure that the supplement electrolyte can be quickly and uniformly supplemented into the accommodating cavity 111.

[0070] When the driving member 240 is arranged in the second flow channel 230, it is used to drive the gas in the accommodating cavity 111 of the battery monomer 100. In this way, the driving member 240 can push the gas in the accommodating cavity 111 to enter the liquid supply member 210 via the second flow channel 230, so as to form a certain negative pressure in the accommodating cavity 111, and then make the supplement electrolyte enter the accommodating cavity 111 in time and effectively via the first flow channel 220, so as to ensure that the accommodating cavity 111 has sufficient electrolyte.

[0071] It should be noted that when the driving members 240 are arranged on the first flow channel 220 and the second flow channel 230 at the same time, the two driving members 240 can work at the same time and can act in concert. They not only promote the rapid supplement of the electrolyte, but also accelerate the circulation of the electrolyte in the battery pack, which is helpful to maintain the uniformity and stability of the electrolyte.

[0072] In a possible implementation, the battery pack further includes a controller 300, and the controller 300 is connected with the driving member 240. By connecting the controller 300 with the driving member 240 and controlling the driving member 240, the process of supplementing the electrolyte into the battery shell 110 can be automated, without manual intervention, which improves the automation degree and operation convenience of the battery pack and reduces the errors and inconvenience caused by manual operation. In addition, the controller 300 can accurately adjust the working parameters of the driving member 240, such as the flow and the pressure, so as to ensure that the flow and speed of the supplement electrolyte meet the actual needs of the battery, avoid excessive or insufficient situations, and ensure the appropriate and uniform distribution of the electrolyte in the battery shell 110.

[0073] It should be noted that the control program of the controller for the starting time of the driving member 240 can be set according to experience or with the aid of other components.

[0074] Please refer to the accompanying drawings Figure 2 For example, the battery monomer 100 further includes a first pressure sensor 150, which is arranged in the battery shell 110 and is used to detect the pressure of the accommodating cavity.

[0075] The first pressure sensor 150 is connected with the controller 300, and the controller 300 is configured to control the working state of the driving member 240 according to the pressure value of the first pressure sensor 150. It should be noted that the working state of the driving member 240 can include the opening time of the driving member 240 and the working parameter of the driving member 240.

[0076] In the embodiment, the controller 300 can receive the pressure value of the first pressure sensor 150, and determine whether the driving member 240 needs to be started according to the pressure value. For example, the controller 300 can compare the pressure value of the first pressure sensor 150 with a preset pressure value. If the pressure value of the first pressure sensor 150 is greater than the preset pressure value, the driving member 240 can be started, so that the supplement electrolyte in the liquid supply member 210 is transported into the battery shell 110 to displace the gas in the battery shell 110.

[0077] In this way, the controller 300 intelligently determines whether the driving member 240 needs to be started according to the pressure value provided by the first pressure sensor 150, so as to realize the automatic control of the driving member 240 and improve the intelligent degree and operation convenience of the system. In addition, the controller 300 can record the pressure data of the first pressure sensor 150, so as to facilitate subsequent analysis and optimization and help improve the design and performance of the battery pack.

[0078] It should be understood that the preset pressure value in the above embodiment should be a safety threshold slightly lower than the opening pressure of the explosion-proof valve of the battery monomer 100, so as to ensure that measures can be taken in time for adjustment before the pressure approaches a dangerous level, so as to improve the safety and stability of the battery pack. The specific preset pressure value can be optimized and determined according to the design parameters and working conditions of the battery pack.

[0079] In a possible implementation, the liquid supply member 210 is provided with an exhaust one-way valve 250. When the internal pressure of the liquid supply member 210 rises, the exhaust one-way valve 250 can be automatically opened to exhaust the excess gas, so as to prevent the internal pressure of the liquid supply member 210 from being too high and ensure the safety and stability of the battery pack.

[0080] In addition, the setting of the exhaust one-way valve 250 allows the gas to be exhausted in one direction, so as to prevent external air or other gas from entering the inside of the liquid supply member 210 in the opposite direction, thereby avoiding the supplement electrolyte from being contaminated or oxidized and maintaining the purity and stability of the supplement electrolyte.

[0081] In the embodiment of the application, the exhaust one-way valve 250 can be arranged on the top surface of the liquid supply member 210, or arranged on the side surface of the liquid supply member 210. Alternatively, the top surface and the side surface of the liquid supply member 210 can be provided with the exhaust one-way valve 250.

[0082] It needs to be understood that the gas will also carry the electrolyte in the battery shell 110 when entering the liquid supply 210 along the second flow channel 230 and the inlet 212. Therefore, the exhaust one-way valve 250 is arranged on the top surface of the liquid supply 210 in the embodiment, or in other words, the exhaust one-way valve 250 is arranged on the side surface of the liquid supply 210 close to the top surface, so that the liquid in the liquid supply 210 can be prevented from overflowing as much as possible, and the safety of the battery pack is improved.

[0083] The opening state of the exhaust one-way valve 250 can be controlled by the controller 300. For example, the liquid supply 210 is also provided with a second pressure sensor connected with the controller 300; wherein the second pressure sensor is used to detect the pressure value in the liquid supply 210, and the controller 300 can control whether the exhaust one-way valve 250 is opened according to the pressure value of the second pressure sensor.

[0084] In a possible implementation, the battery monomer 100 includes multiple, that is, the number of battery monomers 100 is multiple, and the multiple battery monomers 100 can be connected in series, in parallel or in series-parallel to form a battery module.

[0085] The exhaust assembly 200 is in communication with the containing cavity 111 of each battery monomer 100. In the embodiment, the multiple battery monomers 100 are connected in series, in parallel or in series-parallel to form a battery module, and the exhaust assembly 200 is in communication with the containing cavity 111 of each battery monomer 100, so that the distribution of the replenished electrolyte and the effective gas replacement of each battery monomer can be balanced, the overall performance and safety can be improved, the service life of the battery pack can be prolonged, and the stability of the battery pack can be enhanced.

[0086] In addition, the exhaust assembly 200 is in communication with each battery monomer 100, so that the battery management system (BMS) can independently monitor and manage each battery monomer 100, optimize the charging and discharging process, balance the voltage and capacity difference between the battery monomers 100, and improve the management efficiency of the battery module.

[0087] In the embodiment, the active material of the positive electrode tab of each battery monomer will produce gas in the decomposition process, and when the internal gas pressure of the battery shell 110 reaches a certain range, the controller 300 controls the driving member 240 to start, and the electrolyte in the battery shell 110 circulates to take away the gas in the battery shell 110 through gas-liquid exchange, so that the gas in the battery shell 110 is avoided from gathering, the influence of the increase of the internal gas pressure of the battery monomer on the stability of the battery pack is avoided, and the disintegration safety risk of the battery pack caused by insufficient structural strength is reduced. In addition, the gas can also be prevented from entering the tab, the lithium precipitation is prevented, and the service life of the battery monomer is improved.

[0088] The embodiment of the present application further provides a power utilization device, comprising a power utilization apparatus and the battery pack described in any of the above embodiments, and the battery pack is electrically connected with the power utilization apparatus, and is used for providing electric energy for the power utilization apparatus.

[0089] The power utilization device in the embodiment of the present application can be a vehicle, for example: the vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. Correspondingly, the power utilization apparatus can be a driving mechanism of the vehicle, or can be a control system of the vehicle.

[0090] In addition, the power utilization device can also be other energy storage apparatuses, such as a mobile phone, a portable device, a notebook computer, an electric toy, an electric tool, a ship and a spacecraft, etc., wherein the spacecraft can include an airplane, a rocket, a space shuttle or a spaceship.

[0091] Since the power utilization device in the embodiment includes the battery pack described in any of the above embodiments, the power utilization device includes the battery pack structure and the beneficial effects, and the embodiment will not be described here.

[0092] The embodiments or implementations in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be mutually referred to.

[0093] It should be noted that the terms "one embodiment", "an embodiment", "exemplary embodiment", "some embodiments", etc. in the specification mean that the described embodiment can include a specific feature, structure or property, but not necessarily every embodiment includes the specific feature, structure or property. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or property is described in combination with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or property in combination with other embodiments described explicitly or implicitly.

[0094] Generally, the terms should be understood at least partly by the use in the context. For example, at least partly according to the context, the term "one or more" used in the specification can be used to describe any feature, structure or property in the singular sense, or can be used to describe a combination of features, structures or properties in the plural sense. Similarly, at least partly according to the context, terms such as "a" or "said" can be understood as conveying singular usage or conveying plural usage.

[0095] The terms "first", "second", "third", "fourth", and the like in the description and in the claims of the present application, and above depicted figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of these terms herein is merely for distinguishing between the similar objects and the same can be referenced to other terms. It is expressly agreed that all of the claims herein equally encompass various permutations and combinations of the technical solutions described herein.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. Such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A battery cell (100), the battery cell (100) comprising a battery core (160) and a battery housing (110) having a receiving cavity (111), the battery core (160) being disposed in the receiving cavity (111); An exhaust assembly (200) is provided on one side of the battery housing (110) and is independently provided with the battery cell (100); wherein the exhaust assembly (200) is in communication with the accommodating cavity (111) and is used to release gas in the accommodating cavity (111).

2. The battery pack according to claim 1, wherein: The exhaust assembly (200) includes a liquid supply component (210), the liquid supply component (210) includes an inlet (212) and an outlet (211), and the inlet (212) and the outlet (211) are both in communication with the accommodating cavity (111); wherein the liquid supply component (210) is provided with supplementary electrolyte; The supplementary electrolyte in the liquid supply component (210) enters the accommodating chamber (111) via the outlet (211), and the gas in the accommodating chamber (111) enters the liquid supply component (210) via the inlet (212).

3. The battery pack according to claim 2, wherein: The exhaust assembly (200) further includes a first flow conduit (220) and a second flow conduit (230); The outlet (211) is in communication with the accommodating chamber via the first circulation conduit (220), and the inlet (212) is in communication with the accommodating chamber via the second circulation conduit (230).

4. The battery pack according to claim 3, wherein: The exhaust assembly (200) further includes a driving member (240), wherein the driving member (240) is disposed on the first flow pipe (220) and / or the second flow pipe (230); When the driving member (240) is arranged in the first circulation pipe (220), it is used to provide power to replenish the electrolyte in the liquid supply member (210); When the driving member (240) is arranged in the second circulation pipe (230), it is used to provide power to the gas in the accommodating cavity (111) of the battery cell (100).

5. The battery pack according to claim 4, characterized in that: The driving member (240) is arranged on the second circulation pipe (230).

6. The battery pack according to claim 4 or 5, characterized in that: The battery pack further includes a controller (300), and the controller (300) is connected to the driving member (240).

7. The battery pack according to claim 6, characterized in that: The battery cell (100) further includes a first pressure sensor (150), the first pressure sensor (150) being arranged on the battery housing (110) and being used to detect the pressure of the accommodating cavity (111); The first pressure sensor (150) is connected to the controller (300), and the controller (300) is used to control the working state of the driving member (240) according to the pressure value of the first pressure sensor (150).

8. The battery pack according to any one of claims 2 to 5, characterized in that: The liquid supply component (210) is provided with an exhaust one-way valve (250).

9. The battery pack according to any one of claims 1 to 5, characterized in that: The battery cells (100) include a plurality of battery cells, and the exhaust assembly (200) is respectively communicated with the accommodating cavity (111) of each battery cell (100).

10. The battery pack according to any one of claims 1 to 5, characterized in that: The battery cell comprises a positive electrode sheet, a negative electrode sheet and a separator arranged between the positive electrode sheet and the negative electrode sheet; The active material of the positive electrode plate includes at least one of a lithium-rich lithium ferrite material, a lithium-rich lithium nickelate material, a lithium-rich lithium cobaltate material and a lithium-rich lithium oxalate material.

11. An electrical device, characterized in that: It comprises an electric device and the battery pack according to any one of claims 1 to 10, wherein the battery pack is electrically connected to the electric device and is used to provide electrical energy to the electric device.

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