Battery, battery pack and electric equipment

Abstract

The utility model discloses a battery, a battery pack and electric equipment. The battery comprises a first shell and a liquid supplementing mechanism, the first shell is provided with a first accommodating cavity, and the first accommodating cavity can accommodate an electrolyte and a film-forming agent; the liquid supplementing mechanism comprises a second shell and a liquid outlet valve, the second shell is fixedly connected with the first shell, the second shell is provided with a second containing cavity, the second containing cavity can contain the film forming agent, the second containing cavity is communicated with the first containing cavity through a liquid outlet hole, and the liquid outlet hole is blocked by the liquid outlet valve; and the liquid outlet valve can be withdrawn from the liquid outlet hole, so that the second accommodating cavity, the liquid outlet hole and the first accommodating cavity are communicated, and the film-forming agent flows to the first accommodating cavity, so that the concentration of the film-forming agent in the electrolyte is improved. According to the battery provided by the invention, the cycle use frequency of the battery is large, the direct-current internal resistance of the battery is low, and the electrical performance of the battery is good.

Description

Technical Field

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

[0002] In recent years, in order to effectively respond to the challenges of energy crisis and environmental pollution, the world has focused on the development of sustainable energy utilization, and new energy vehicles have attracted global attention.

[0003] Lithium-ion power batteries are the best choice for new energy vehicles at this stage, and are also the most widely used batteries in new energy vehicles. How to improve the electrical performance of lithium-ion power batteries is an issue that needs to be solved urgently. Utility Model Content

[0004] The purpose of the present application is to provide a battery, a battery pack and an electrical device. In the battery provided in the present application, the battery has a large number of cycles, a low DC internal resistance and good electrical performance.

[0005] According to a first aspect of the present application, there is provided a battery, comprising a first shell and a liquid replenishing mechanism; the first shell is provided with a first accommodating chamber, which can accommodate an electrolyte and a film-forming agent; the liquid replenishing mechanism comprises a second shell and a liquid outlet valve, the second shell is fixedly connected to the first shell, the second shell is provided with a second accommodating chamber, which can accommodate the film-forming agent, the second accommodating chamber and the first accommodating chamber are connected through a liquid outlet hole, and the liquid outlet valve blocks the liquid outlet hole; the liquid outlet valve can be evacuated from the liquid outlet hole to connect the second accommodating chamber, the liquid outlet hole and the first accommodating chamber, and the film-forming agent flows to the first accommodating chamber to increase the concentration of the film-forming agent in the electrolyte.

[0006] In some embodiments, the liquid outlet valve includes a driving section and a blocking section, the driving section and the blocking section are fixedly connected, and the blocking section blocks the liquid outlet; the driving section can drive the blocking section to move along the height direction of the battery so that the blocking section is evacuated from the liquid outlet.

[0007] In some embodiments, the blocking section and the wall surface of the liquid outlet hole are connected via a sealing ring.

[0008] In some embodiments, the second shell is further provided with a first connection hole, the first connection hole and the liquid outlet are arranged opposite to each other along the height direction of the battery, and the driving section is arranged in the first connection hole.

[0009] In some embodiments, the driving section is cooperatively connected to the hole wall of the first connecting hole, or the driving section is connected to the hole wall of the first connecting hole through threads, or the driving section is connected to the hole wall of the first connecting hole through a sealing ring.

[0010] In some embodiments, the second shell includes a connecting tube, the connecting tube is provided with a second connecting hole, and the second connecting hole passes through the connecting tube along the height direction of the battery; the connecting tube is fixedly connected to the top surface of the second accommodating cavity, the first connecting hole and the second connecting hole are connected, and the driving section is arranged in the first connecting hole and the second connecting hole.

[0011] In some embodiments, the driving section is cooperatively connected to the hole wall of the second connecting hole, the driving section is connected to the hole wall of the second connecting hole by threads, or the driving section is connected to the hole wall of the second connecting hole by a sealing ring.

[0012] In some embodiments, the fluid replenishing mechanism also includes a first elastic member, which is connected between the sealing section and the top surface of the second accommodating chamber; the first elastic member can provide elastic force to the sealing section to drive the liquid outlet valve to seal the liquid outlet hole.

[0013] In some embodiments, the liquid outlet valve also includes a connecting section, which is arranged in the second accommodating chamber, the connecting section and the driving section are fixedly connected, and the connecting section and the blocking section are relatively arranged along the height direction of the battery; the liquid replenishing mechanism also includes a second elastic member, which is connected between the connecting section and the bottom surface of the second accommodating chamber, and the second elastic member can provide elastic force to the connecting section to drive the liquid outlet valve to block the liquid outlet hole.

[0014] In some embodiments, the liquid outlet valve also includes a magnetic component, which is rotatably connected to the top surface of the second accommodating chamber; the driving section is provided with a third connecting hole, and the third connecting hole is recessed along the height direction of the battery at one end of the driving section facing the top surface of the second accommodating chamber, and the magnetic component is connected to the hole wall surface of the third connecting hole by a thread; an external magnetic device drives the magnetic component to rotate so that the driving section moves along the height direction of the battery.

[0015] A second aspect of the present application provides a battery pack, which includes a housing and the battery provided by the first aspect, wherein a plurality of the batteries are connected in sequence and installed in the housing.

[0016] A third aspect of the present application provides an electric device, the electric device comprising the battery pack provided in the second aspect above, the battery pack being used to supply power to the electric device.

[0017] In the battery provided in the embodiment of the present application, the battery includes a first shell and a liquid replenishing mechanism, the first shell is provided with a first accommodating chamber, and the electrolyte and the film-forming agent are injected into the first accommodating chamber of the first shell. The liquid replenishing mechanism includes a second shell and a liquid outlet valve, the second shell is fixedly connected to the first shell, the second shell is provided with a second accommodating chamber, and the film-forming agent is injected into the second accommodating chamber of the second shell, the second accommodating chamber and the first accommodating chamber are connected through a liquid outlet hole, and the liquid outlet valve blocks the liquid outlet hole.

[0018] Compared with the battery provided by the related art, the concentration of the film former in the electrolyte in the first receiving chamber is low, and the electrolyte reacts electrochemically with the relatively low concentration of the film former to form a SEI film on the negative electrode of the battery. Compared with the SEI film formed in the battery provided by the related art, the thickness of the SEI film formed on the negative electrode of the battery in this embodiment is small, so the metal ions in the electrolyte can easily pass through the relatively small SEI film, thereby reducing the DC internal resistance of the battery, and the discharge rate performance (or charge rate performance) is good, and thus the battery performance is good.

[0019] When the film-forming agent in the electrolyte in the first accommodation chamber is gradually consumed, the concentration of the film-forming agent in the electrolyte gradually decreases. When the concentration of the film-forming agent in the electrolyte decreases to a concentration threshold, the liquid outlet valve can be withdrawn from the liquid outlet hole to connect the second accommodation chamber, the liquid outlet hole and the first accommodation chamber, and the film-forming agent in the second accommodation chamber flows to the first accommodation chamber, the film-forming agent is mixed with the electrolyte, the concentration of the film-forming agent in the electrolyte increases, and the film-forming agent and the electrolyte continue to undergo an electrochemical reaction to form a new SEI film to repair the damaged SEI film, further increasing the number of cycles of the battery.

[0020] In the battery provided in the present application, the battery has a large number of cycle uses, a low DC internal resistance, and a good electrical performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of a battery provided in one embodiment of the present application.

[0023] Figure 2 yes Figure 1 A cross-sectional view of the battery along line AA.

[0024] Figure 3 yes Figure 2 Cross-sectional view of the battery in the refilling state.

[0025] Figure 4 yes Figure 1 Schematic diagram of the three-dimensional structure of the fluid replenishment mechanism.

[0026] Figure 5 It is a cross-sectional view of a fluid replenishment mechanism provided in another embodiment of the present application.

[0027] Figure 6 yes Figure 5 A cross-sectional view of the fluid replenishment mechanism in the fluid replenishment state.

[0028] Figure 7 It is a cross-sectional view of a fluid replenishment mechanism provided in another embodiment of the present application.

[0029] Figure 8 It is a cross-sectional view of a fluid replenishment mechanism provided in another embodiment of the present application.

[0030] Fig. 9 It is a cross-sectional view of a fluid replenishment mechanism provided in another embodiment of the present application.

[0031] Fig.10 yes Fig. 9 A cross-sectional view of the fluid replenishment mechanism in the fluid replenishment state.

[0032] Description of reference numerals:

[0033] 100-battery; 10-first shell; 101-first accommodating chamber; 103-first end wall; 104-second end wall; 105-first side wall; 106-second side wall; 107-first bottom wall; 108-first top wall; 1081-installation groove; 109-liquid injection hole; 110-explosion-proof hole; 20-electrode assembly; 21-pole core; 231-positive pole; 232-negative pole; 30-liquid replenishing mechanism; 31- Second shell; 311-second accommodating chamber; 312-second top wall; 3121-first connecting hole; 313-second bottom wall; 314-peripheral wall; 315-connecting tube; 3151-second connecting hole; 32-liquid outlet hole; 33-liquid outlet valve; 331-driving section; 3311-third connecting hole; 332-sealing section; 333-connecting section; 334-magnetic member; 34-first elastic member; 35-second elastic member. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] In the electrochemical system of the battery, a certain concentration of film-forming agent is mixed with the electrolyte, and an electrochemical reaction occurs under certain conditions to form a solid electrolyte interface (SEI film) at the negative electrode of the battery. The film-forming agent can be vinylene carbonate (VC) and other auxiliary materials, and the film-forming agent can also be a combination of one or more film-forming agents, which is not limited here.

[0039] The high concentration of film former reacts electrochemically with the electrolyte to form a thicker SEI film at the negative electrode of the electrode assembly, thereby increasing the number of battery cycles and extending the battery life. In addition, during the use of the battery, the SEI film will continue to be damaged and repaired. The high concentration of film former reacts electrochemically with the electrolyte to continuously repair the damaged SEI film, further increasing the number of battery cycles.

[0040] However, the metal ions in the electrolyte cannot easily pass through the thick SEI film, which increases the DC internal resistance of the battery, further increasing the heating of the battery due to ohmic impedance and reducing the discharge rate performance (or charge rate performance) of the battery.

[0041] If the initial concentration of the film-forming agent added is low, the low-concentration film-forming agent reacts electrochemically with the electrolyte to form a thin SEI film at the negative electrode of the electrode assembly. The metal ions in the electrolyte can easily pass through the thin SEI film. Therefore, the DC internal resistance of the battery is low and the battery has good discharge rate performance (or charge rate performance). However, during the use of the battery, when the film-forming agent in the electrolyte is gradually consumed, the concentration of the film-forming agent gradually decreases, the film-forming agent does not react electrochemically with the electrolyte, and the SEI film cannot be formed. The SEI film is constantly damaged, reducing the number of battery cycles.

[0042] Therefore, how to increase the number of battery cycles while reducing the DC internal resistance of the battery is a problem that needs to be solved in this application.

[0043] See also Figures 1 to 3 , the embodiment of the present application provides a battery 100. 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. The X-axis, the Y-axis, and the Z-axis are perpendicular to each other.

[0044] The directional terms such as "upper", "top", "lower", "bottom", "left", and "right" mentioned in the description of the embodiments of the present application are described based on the directions shown in the drawings, with the positive direction of the Z axis being "upper" and "top", the negative direction of the Z axis being "lower" and "bottom", the positive direction of the X axis being "right", and the negative direction of the X axis being "left", and they do not constitute a limitation on the actual application scenario of the battery 100. The terms "same", "equal", "consistent", or "parallel" used herein are all allowed to have certain tolerances.

[0045] The battery 100 includes a first shell 10 , an electrode assembly 20 and a liquid replenishing mechanism 30 , wherein the electrode assembly 20 includes a pole core 21 , and the pole core 21 includes a positive electrode and a negative electrode.

[0046] The first housing 10 is provided with a first accommodating chamber 101, and the pole core 21 is arranged in the first accommodating chamber 101. The first accommodating chamber 101 can accommodate electrolyte and film-forming agent. The liquid replenishing mechanism 30 includes a second housing 31 and a liquid outlet valve 33. The second housing 31 is fixedly connected to the first housing 10. The second housing 31 is provided with a second accommodating chamber 311. The second accommodating chamber 311 can accommodate the film-forming agent.

[0047] like Figure 2 and Figure 3As shown, the second accommodating chamber 311 is connected to the first accommodating chamber 101 through the liquid outlet 32, and the liquid outlet valve 33 blocks the liquid outlet 32. The liquid outlet valve 33 can be withdrawn from the liquid outlet 32 ​​to connect the second accommodating chamber 311, the liquid outlet 32 ​​and the first accommodating chamber 101, and the film-forming agent in the second accommodating chamber 311 flows to the first accommodating chamber 101, and the film-forming agent is mixed with the electrolyte to increase the concentration of the film-forming agent in the electrolyte.

[0048] In this embodiment, an electrolyte and a film-forming agent are injected into the first accommodating chamber 101 of the first shell 10, and a film-forming agent is injected into the second accommodating chamber 311 of the second shell 31. Compared with the battery provided by the related art, the concentration of the film-forming agent in the electrolyte in the first accommodating chamber 101 is low, and the electrolyte reacts electrochemically with the relatively low concentration of the film-forming agent to form a SEI film on the negative electrode of the pole core 21. Compared with the SEI film formed in the battery provided by the related art, the SEI film formed on the negative electrode of the pole core 21 in this embodiment has a small thickness, so the metal ions in the electrolyte can easily pass through the relatively small thickness of the SEI film, thereby reducing the DC internal resistance of the battery 100, and the discharge rate performance (or charging rate performance) is good, and thus the performance of the battery 100 is good.

[0049] During the use of the calendar, when the film-forming agent in the electrolyte in the first accommodating chamber 101 is gradually consumed, the concentration of the film-forming agent in the electrolyte gradually decreases. When the concentration of the film-forming agent in the electrolyte is reduced to the concentration threshold, at this time, the liquid outlet valve 33 is withdrawn from the liquid outlet 32 ​​to connect the second accommodating chamber 311, the liquid outlet 32 ​​and the first accommodating chamber 101, and the film-forming agent in the second accommodating chamber 311 flows to the first accommodating chamber 101, the film-forming agent is mixed with the electrolyte, and the concentration of the film-forming agent in the electrolyte is increased. The film-forming agent and the electrolyte continue to react electrochemically to form a new SEI film to repair the damaged SEI film, further increasing the number of cycles of the battery. Therefore, the battery 100 provided in this embodiment can reduce the DC internal resistance of the battery while increasing the number of cycles of the battery, and the performance of the battery 100 is high. The above-mentioned concentration threshold refers to the concentration of the film-forming agent in the electrolyte when the film-forming agent and the electrolyte do not react electrochemically under certain conditions.

[0050] Please still refer to Figures 1 to 3 The first 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.

[0051] 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 to form the first accommodating cavity 101 of the first 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-mentioned opening is connected to the first accommodating cavity 101 of the first shell 10, and 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-mentioned opening.

[0052] The first shell 10 is a rectangular structure, and the outer surface of the first shell 10 is regular, making the structure of the battery 100 more compact and convenient for connecting multiple batteries in sequence. In other embodiments, the first shell 10 can also be a cylindrical structure, a conical structure or other shapes, which are not limited here.

[0053] In some embodiments, the first housing 10 is provided with a liquid injection hole 109, and the liquid injection hole 109 passes through the upper surface and the lower surface of the first top wall 108. The electrolyte is injected into the first receiving 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.

[0054] In some embodiments, the first housing 10 is further provided with an explosion-proof hole 110, 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 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.

[0055] The electrode assembly 20 also includes two tabs (not shown in the figure) and two poles. The two tabs include a positive tab and a negative tab, and the positive tab and the negative tab are respectively fixedly connected to the pole core 21. The two poles are respectively a positive pole 231 and a negative pole 232, one end of the positive pole 231 is connected to the positive tab, and the other end of the positive pole 231 extends out of the first shell 10, and the other end of the positive pole 231 can be connected to the negative pole of other batteries; one end of the negative pole 232 is connected to the negative tab, and the other end of the negative pole 232 extends out of the first shell 10, and the other end of the negative pole 232 can be connected to the positive pole of other batteries.

[0056] Please also read Figure 4The second shell 31 includes a second top wall 312, a second bottom wall 313 and a peripheral wall 314. The second top wall 312 and the second bottom wall 313 are spaced apart and opposite to each other along the height direction of the battery 100. The top wall is arranged in the positive direction of the Z axis relative to the second bottom wall 313. One side of the peripheral wall 314 along the positive direction of the Z axis is connected to the edge of the second top wall 312, and one side of the peripheral wall 314 along the negative direction of the Z axis is connected to the edge of the second bottom wall 313. The second top wall 312, the second bottom wall 313 and the peripheral wall 314 enclose a second accommodating cavity 311.

[0057] The second shell 31 of the present embodiment is a cylindrical structure. In other examples, the second shell 31 may also be a rectangular structure, a conical structure or other structures, which are not limited here.

[0058] In some embodiments, the second bottom wall 313 of the second shell 31 is fixedly connected to the first top wall 108 of the first shell 10, and the liquid outlet 32 ​​is provided on the second bottom wall 313 and the first top wall 108. The liquid outlet 32 ​​penetrates the second bottom wall 313 and the first top wall 108 along the height direction of the battery 100, and the second accommodating chamber 311 is connected to the first accommodating chamber 101 through the liquid outlet 32. The liquid outlet valve 33 blocks the liquid outlet 32, that is, the outer peripheral surface of the liquid outlet valve 33 abuts against the hole wall surface of the liquid outlet 32 ​​to isolate the first accommodating chamber 101 from the second accommodating chamber 311. The liquid outlet valve 33 can be evacuated from the liquid outlet 32, and the second accommodating chamber 311, the liquid outlet 32 ​​and the first accommodating chamber 101 are connected. The negative direction of the Z axis is the same as the gravity direction. The film-forming agent in the second accommodating chamber 311 flows to the first accommodating chamber 101 by its own gravity and mixes with the electrolyte, thereby increasing the concentration of the film-forming agent in the electrolyte.

[0059] The liquid outlet valve 33 can block the liquid outlet hole 32 again, the second accommodating chamber 311 is isolated from the first accommodating chamber 101, and the film-forming agent in the second accommodating chamber 311 no longer flows to the first accommodating chamber 101. Similarly, the liquid outlet valve 33 can replenish the film-forming agent to the first accommodating chamber 101 once or multiple times, and can effectively control the volume of the film-forming agent flowing to the first accommodating chamber 101, thereby controlling the concentration of the film-forming agent in the electrolyte, and thereby controlling the thickness of the SEI film on the negative electrode in the electrode core 21.

[0060] In some embodiments, the first top wall 108 is provided with a mounting groove 1081, and the mounting groove 1081 penetrates the first top wall 108 along the height direction of the battery 100, that is, the mounting groove 1081 penetrates the upper surface and the lower surface of the first top wall 108. The second shell 31 is fixed to the mounting groove 1081, that is, the peripheral wall 314 of the second shell 31 abuts against the peripheral surface of the groove of the mounting groove 1081, so that the second shell 31 and the first shell 10 are fixedly connected. The liquid outlet 32 ​​is provided on the second bottom wall 313 of the second shell 31, and the liquid outlet 32 ​​penetrates the upper surface and the lower surface of the second bottom wall 313 along the height direction of the battery 100, and the second accommodating cavity 311 and the first accommodating cavity 101 are connected through the liquid outlet 32.

[0061] The mounting groove 1081 includes a first sub-groove and a second sub-groove, the first sub-groove and the second sub-groove are connected along the height direction of the battery 100, the inner diameter of the first sub-groove is larger than the inner diameter of the second sub-groove, and a mounting surface is formed between the first sub-groove and the second sub-groove. The first sub-groove is recessed in the upper surface of the first top wall 108, and the second sub-groove is recessed in the bottom surface of the first sub-groove. The second sub-groove runs through the bottom surface of the second sub-groove and the lower surface of the first top wall 108, and the above-mentioned mounting surface is also the bottom surface of the first sub-groove. The second bottom wall 313 of the second shell 31 is fixedly connected to the above-mentioned mounting surface, and the peripheral wall 314 of the second shell 31 abuts against the peripheral surface of the first sub-groove, so that the installation of the first shell 10 and the second shell 31 is more secure.

[0062] The second accommodating chamber 311, the liquid outlet hole 32, the second sub-trough, and the first accommodating chamber 101 are connected, and the liquid outlet valve 33 blocks the liquid outlet hole 32; the liquid outlet valve 33 can be withdrawn from the liquid outlet hole 32, and the second accommodating chamber 311, the liquid outlet hole 32, the second sub-trough, and the first accommodating chamber 101 are connected, and the film-forming agent in the second accommodating chamber 311 flows to the first accommodating chamber 101 by its own gravity and mixes with the electrolyte.

[0063] In other embodiments, the second bottom wall 313 of the second shell 31 is fixedly connected to the first side wall 105 of the first shell 10, the negative direction of the X-axis is the same as the direction of gravity, the liquid outlet 32 ​​is provided on the second bottom wall 313 and the first side wall 105, the liquid outlet 32 ​​penetrates the second bottom wall 313 and the first side wall 105 along the length direction of the battery 100, and the second accommodating cavity 311 and the first accommodating cavity 101 are connected through the liquid outlet 32.

[0064] In other embodiments, the second bottom wall 313 of the second shell 31 is fixedly connected to the second side wall 106 of the first shell 10, the positive direction of the X-axis is the same as the direction of gravity, the liquid outlet 32 ​​is provided on the second bottom wall 313 and the second side wall 106, the liquid outlet 32 ​​penetrates the second bottom wall 313 and the second side wall 106 along the length direction of the battery 100, and the second accommodating chamber 311 and the first accommodating chamber 101 are connected through the liquid outlet 32.

[0065] In other embodiments, the second bottom wall 313 of the second shell 31 is fixedly connected to the first end wall 103 of the first shell 10, the positive direction of the Y-axis is the same as the direction of gravity, the liquid outlet 32 ​​is provided on the second bottom wall 313 and the first end wall 103, the liquid outlet 32 ​​penetrates the second bottom wall 313 and the first end wall 103 along the width direction of the battery 100, and the second accommodating cavity 311 and the first accommodating cavity 101 are connected through the liquid outlet 32.

[0066] In other embodiments, the second bottom wall 313 of the second shell 31 may also be fixedly connected to the second end wall 104 of the first shell 10, the negative direction of the Y-axis is the same as the direction of gravity, the liquid outlet 32 ​​is provided on the second bottom wall 313 and the second end wall 104, the liquid outlet 32 ​​passes through the second bottom wall 313 and the second end wall 104 along the width direction of the battery 100, and the second accommodating chamber 311 and the first accommodating chamber 101 are connected through the liquid outlet 32.

[0067] See also Figures 2 to 4 In this embodiment, the liquid outlet valve 33 includes a driving section 331 and a blocking section 332. The driving section 331 and the blocking section 332 are fixedly connected. The blocking section 332 blocks the liquid outlet hole 32. The driving section 331 can drive the blocking section 332 to move along the height direction of the battery 100 so that the blocking section 332 is evacuated from the liquid outlet hole 32.

[0068] The blocking section 332 is connected to the wall surface of the liquid outlet hole 32 via a sealing ring. Specifically, a sealing ring is provided on the outer peripheral surface of the blocking section 332, or a sealing ring is provided on the wall surface of the liquid outlet hole 32, or a sealing ring is provided on the outer peripheral surface of the blocking section 332 and the wall surface of the liquid outlet hole 32. By providing the sealing ring, the film-forming agent in the second shell 31 can be prevented from leaking out of the liquid outlet hole 32.

[0069] The second top wall 312 of the second shell 31 is provided with a first connection hole 3121, which passes through the upper surface and the lower surface of the second top wall 312 along the height direction of the battery 100. The first connection hole 3121 and the liquid outlet hole 32 are arranged opposite to each other along the height direction of the battery 100, and the driving section 331 is arranged in the first connection hole 3121.

[0070] Exemplarily, the driving section 331 is cooperatively connected with the hole wall surface of the first connecting hole 3121, the outer diameter of the driving section 331 is less than or equal to the hole diameter of the first connecting hole 3121, the driving section 331 can move in the first connecting hole 3121 along the height direction of the battery 100, and the driving section 331 can drive the blocking section 332 to move along the height direction of the battery 100 so that the blocking section 332 is evacuated from the liquid outlet 32.

[0071] Exemplarily, the first connection hole 3121 is a threaded hole, that is, the hole wall of the first connection hole 3121 is provided with an internal thread, the driving section 331 is a screw, at least the circumference of the driving section 331 is provided with an external thread, and the driving section 331 is connected to the hole wall of the first connection hole 3121 through the cooperation of the internal thread and the external thread. The driving section 331 rotates around its axial centerline, and the driving section 331 can move along the height direction of the battery 100. The driving section 331 can drive the blocking section 332 to move along the height direction of the battery 100, so that the blocking section 332 is evacuated from the liquid outlet 32.

[0072] Exemplarily, the driving section 331 is connected to the hole wall of the first connection hole 3121 through a sealing ring. Specifically, the outer peripheral surface of the driving section 331 is provided with a sealing ring, or the hole wall of the first connection hole 3121 is provided with a sealing ring, or the outer peripheral surface of the driving section 331 and the hole wall of the first connection hole 3121 are both provided with sealing rings. The driving section 331 can move along the height direction of the battery 100 in the first connection hole 3121, and the driving section 331 can drive the blocking section 332 to move along the height direction of the battery 100, so that the blocking section 332 is evacuated from the liquid outlet 32. By providing a sealing ring, external contaminants can be prevented from entering the second accommodating chamber 311, thereby avoiding contamination of the film-forming agent.

[0073] In this example, the outer diameter of the driving section 331 is smaller than the outer diameter of the blocking section 332, and the driving section 331 can move along the positive direction of the Z axis, and the driving section 331 drives the blocking section 332 to move along the positive direction of the Z axis, so that the blocking section 332 is evacuated from the liquid outlet 32; the driving section 331 can also move along the negative direction of the Z axis, and the driving section 331 drives the blocking section 332 to move along the negative direction of the Z axis, so that the blocking section 332 is evacuated from the liquid outlet 32. In other examples, the outer diameter of the driving section 331 is equal to or greater than the outer diameter of the blocking section 332, and the driving section 331 can move along the positive direction of the Z axis, and the driving section 331 drives the blocking section 332 to move along the positive direction of the Z axis, so that the blocking section 332 is evacuated from the liquid outlet 32.

[0074] See also Figure 5 and Figure 6In this embodiment, the second shell 31 further includes a connecting cylinder 315, and the connecting cylinder 315 is provided with a second connecting hole 3151, and the second connecting hole 3151 penetrates the connecting cylinder along the height direction of the battery 100. The connecting cylinder 315 is arranged in the second accommodating cavity 311, and the connecting cylinder 315 has a fixed end and a free end, and the fixed end and the free end are respectively arranged at opposite sides of the connecting cylinder 315 along the height direction thereof, and the second connecting hole 3151 penetrates the fixed end and the free end. The fixed end of the connecting cylinder 315 is fixedly connected to the cavity top surface of the second accommodating cavity 311, and the free end of the connecting cylinder 315 is opposite to the cavity bottom surface of the second accommodating cavity 311, the first connecting hole 3121 is connected with the second connecting hole 3151 along the height direction of the battery 100, and the driving section 331 is arranged at the first connecting hole 3121 and the second connecting hole 3151. The connecting tube 315 plays a guiding role, and the driving section 331 is not easy to shake when moving along the height direction of the battery 100, so the blocking section 332 can be evacuated from the liquid outlet 32 ​​more smoothly; in addition, the blocking section 332 can block the liquid outlet 32 ​​again more smoothly, and the operation is more convenient.

[0075] Exemplarily, the driving section 331 is cooperatively connected with the wall surface of the second connecting hole 3151, the outer diameter of the driving section 331 is less than or equal to the aperture of the second connecting hole 3151, the driving section 331 can move in the second connecting hole 3151 along the height direction of the battery 100, and the driving section 331 can drive the blocking section 332 to move along the height direction of the battery 100 so that the blocking section 332 is evacuated from the liquid outlet 32.

[0076] Exemplarily, the second connection hole 3151 is a threaded hole, that is, the hole wall of the second connection hole 3151 is provided with an internal thread, the driving section 331 is a screw, at least the circumference of the driving section 331 is provided with an external thread, and the driving section 331 is connected to the hole wall of the second connection hole 3151 through the cooperation of the internal thread and the external thread. The driving section 331 rotates around its axial centerline, and the driving section 331 can move along the height direction of the battery 100. The driving section 331 can drive the blocking section 332 to move along the height direction of the battery 100, so that the blocking section 332 is evacuated from the liquid outlet 32.

[0077] Exemplarily, the driving section 331 is connected to the hole wall surface of the second connection hole 3151 through a sealing ring. Specifically, a sealing ring is provided on the outer peripheral surface of the driving section 331, or a sealing ring is provided on the hole wall surface of the second connection hole 3151, or a sealing ring is provided on the outer peripheral surface of the driving section 331 and the hole wall surface of the second connection hole 3151. The driving section 331 can move in the second connection hole 3151 along the height direction of the battery 100, and the driving section 331 can drive the blocking section 332 to move along the height direction of the battery 100, so that the blocking section 332 is evacuated from the liquid outlet 32.

[0078] See also Figure 7In some embodiments, the fluid replenishing mechanism 30 includes a first elastic member 34 , which is located in the second accommodating cavity 311 , and the first elastic member 34 is connected between the blocking section 332 and the top surface of the second accommodating cavity 311 .

[0079] The driving section 331 moves along the positive direction of the Z axis, and the driving section 331 drives the blocking section 332 to move along the positive direction of the Z axis, and the blocking section 332 withdraws from the liquid outlet 32. During the movement of the blocking section 332 along the positive direction of the Z axis, the blocking section 332 abuts against the first elastic member 34, and the first elastic member 34 contracts. The first elastic member 34 has an expansion movement tendency, and the first elastic member 34 can provide elastic force to the blocking section 332, that is, the first elastic member 34 abuts against the blocking section 332, so that the blocking section 332 moves along the negative direction of the Z axis, and the blocking section 332 blocks the liquid outlet 32 ​​again.

[0080] The driving section 331 moves along the negative direction of the Z axis, and the driving section 331 drives the blocking section 332 to move along the negative direction of the Z axis, and the blocking section 332 withdraws from the liquid outlet 32. During the movement of the blocking section 332 along the negative direction of the Z axis, the blocking section 332 drives the first elastic member 34 to expand, and the first elastic member 34 has a contraction movement tendency. The first elastic member 34 can provide elastic force to the blocking section 332, that is, the first elastic member 34 drives the blocking section 332 to move along the positive direction of the Z axis, and the blocking section 332 blocks the liquid outlet 32 ​​again.

[0081] See also Figure 8 In some embodiments, the liquid outlet valve 33 further includes a connecting section 333, which is disposed in the second accommodating chamber 311, the connecting section 333 and the driving section 331 are fixedly connected, and the connecting section 333 and the blocking section 332 are disposed opposite to each other along the height direction of the battery 100. The liquid replenishing mechanism 30 further includes a second elastic member 35, which is located in the second accommodating chamber 311, and is connected between the connecting section 333 and the bottom surface of the second accommodating chamber 311.

[0082] The driving section 331 moves along the positive direction of the Z axis, and the driving section 331 drives the blocking section 332 and the connecting section 333 to move along the positive direction of the Z axis, and the blocking section 332 withdraws from the liquid outlet 32. During the movement of the connecting section 333 along the positive direction of the Z axis, the connecting section 333 drives the second elastic member 35 to expand, and the second elastic member 35 has a contraction movement tendency. The second elastic member 35 can provide elastic force to the connecting section 333, that is, the second elastic member 35 drives the connecting section 333 to move along the negative direction of the Z axis, and the connecting section 333 drives the driving section 331 and the blocking section 332 to move along the negative direction of the Z axis, and the blocking section 332 blocks the liquid outlet 32 ​​again.

[0083] The driving section 331 moves along the negative direction of the Z axis, and the driving section 331 drives the blocking section 332 and the connecting section 333 to move along the negative direction of the Z axis, and the blocking section 332 withdraws from the liquid outlet 32. During the movement of the connecting section 333 along the negative direction of the Z axis, the connecting section 333 abuts against the second elastic member 35, and the second elastic member 35 contracts. The second elastic member 35 has an expansion movement tendency, and the second elastic member 35 can provide elastic force to the connecting section 333, that is, the second elastic member 35 abuts against the connecting section 333, so that the driving section 331 and the blocking section 332 move along the positive direction of the Z axis, and the blocking section 332 blocks the liquid outlet 32 ​​again.

[0084] See also Fig. 9 and Fig.10 In some embodiments, the liquid outlet valve 33 further includes a magnetic member 334, which is rotatably connected to the top surface of the second accommodating chamber 311. The driving section 331 is provided with a third connection hole 3311, which is recessed along the height direction of the battery 100 at one end of the driving section 331 facing the top surface of the second accommodating chamber 311. In this embodiment, the second top wall 312 is not provided with a first connection hole 3121 to prevent external contaminants from entering the second accommodating chamber 311 and avoid contamination.

[0085] The magnetic member 334 is connected to the hole wall of the third connection hole 3311 through a threaded connection. Specifically, the outer peripheral surface of the magnetic member 334 is provided with an external thread, the third connection hole 3311 is a threaded hole, the hole wall of the third connection hole 3311 is provided with an internal thread, and the driving section 331 is connected to the hole wall of the third connection hole 3311 through the matching of the internal thread and the external thread. The magnetic member 334 is made of a magnetic material, and the external magnetic device can drive the magnetic member 334 to rotate around the circumferential center line of the magnetic member 334, and the driving section 331 can move along the height direction of the battery 100. The driving section 331 can drive the blocking section 332 to move along the height direction of the battery 100, so that the blocking section 332 is evacuated from the liquid outlet 32.

[0086] The external magnetic device can also drive the magnetic part 334 to rotate in the opposite direction around the circumferential center line of the magnetic part 334, and the driving section 331 can move along the height direction of the battery 100. The driving section 331 can drive the blocking section 332 to move along the height direction of the battery 100, so that the blocking section 332 blocks the liquid outlet 32 ​​again.

[0087] An embodiment of the present application further provides a battery pack, which includes a housing and a plurality of batteries 100 , wherein the plurality of batteries 100 are connected in sequence and installed in the housing.

[0088] The embodiment of the present application also provides an electric device, which includes a battery pack, and the battery pack is used to power the electric device. For example, the electric device may be a vehicle controller, and the battery pack is used to power the vehicle controller. The electric device may also be a central control display screen or an audio device, and the battery pack is used to power the central control display screen or an audio device. The electric device may also be other devices, and the embodiment of the present application is not limited thereto.

[0089] The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model; at the same time, for general technicians in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A battery, characterized in that: The battery comprises a first shell and a liquid replenishing mechanism; the first shell is provided with a first accommodating cavity, and the first accommodating cavity can accommodate an electrolyte and a film-forming agent; The liquid replenishing mechanism includes a second shell and a liquid outlet valve. The second shell is fixedly connected to the first shell. The second shell is provided with a second accommodating chamber. The second accommodating chamber can accommodate the film-forming agent. The second accommodating chamber and the first accommodating chamber are connected through a liquid outlet hole. The liquid outlet valve blocks the liquid outlet hole. The liquid outlet valve can be withdrawn from the liquid outlet hole to connect the second accommodating chamber, the liquid outlet hole and the first accommodating chamber. The film-forming agent in the second accommodating chamber flows to the first accommodating chamber to increase the concentration of the film-forming agent in the electrolyte.

2. The battery according to claim 1, characterized in that The liquid outlet valve includes a driving section and a blocking section, wherein the driving section and the blocking section are fixedly connected, and the blocking section blocks the liquid outlet hole; the driving section can drive the blocking section to move along the height direction of the battery so that the blocking section is evacuated from the liquid outlet hole.

3. The battery according to claim 2, characterized in that The blocking section and the hole wall surface of the liquid outlet hole are connected via a sealing ring.

4. The battery according to claim 2, characterized in that The second shell is further provided with a first connection hole, the first connection hole and the liquid outlet are arranged opposite to each other along the height direction of the battery, and the driving section is arranged in the first connection hole.

5. The battery according to claim 4, characterized in that The driving section is connected to the hole wall of the first connecting hole in a cooperative manner, or the driving section is connected to the hole wall of the first connecting hole through threads, or the driving section is connected to the hole wall of the first connecting hole through a sealing ring.

6. The battery according to claim 4, characterized in that The second shell includes a connecting tube, the connecting tube is provided with a second connecting hole, and the second connecting hole passes through the connecting tube along the height direction of the battery; the connecting tube is fixedly connected to the top surface of the second accommodating cavity, the first connecting hole and the second connecting hole are connected, and the driving section is arranged in the first connecting hole and the second connecting hole.

7. The battery according to claim 6, characterized in that The driving section is cooperatively connected to the hole wall surface of the second connecting hole, the driving section is connected to the hole wall surface of the second connecting hole by threads, or the driving section is connected to the hole wall surface of the second connecting hole by a sealing ring.

8. The battery according to claim 4 or 6, characterized in that: The liquid replenishing mechanism also includes a first elastic member, which is connected between the blocking section and the top surface of the second accommodating chamber; the first elastic member can provide elastic force to the blocking section to drive the liquid outlet valve to block the liquid outlet hole.

9. The battery according to claim 4 or 6, characterized in that: The liquid outlet valve further includes a connecting section, which is disposed in the second accommodating chamber, the connecting section is fixedly connected to the driving section, and the connecting section and the blocking section are disposed opposite to each other along a height direction of the battery; The liquid replenishing mechanism also includes a second elastic member, which is connected between the connecting section and the bottom surface of the second accommodating chamber. The second elastic member can provide elastic force to the connecting section to drive the liquid outlet valve to block the liquid outlet hole.

10. The battery according to claim 2, characterized in that The liquid outlet valve further comprises a magnetic member, and the magnetic member is rotatably connected to the top surface of the second accommodating chamber; The driving section is provided with a third connecting hole, and the third connecting hole is recessed along the height direction of the battery at one end of the driving section facing the top surface of the second accommodating cavity, and the magnetic part is connected to the hole wall surface of the third connecting hole by a thread; an external magnetic device drives the magnetic part to rotate so that the driving section moves along the height direction of the battery.

11. A battery pack, characterized in that: The battery pack comprises a housing and a plurality of batteries according to any one of claims 1 to 10, wherein the plurality of batteries are connected in sequence and installed in the housing.

12. An electrical equipment, characterized in that: The electric device comprises the battery pack as claimed in claim 11, and the battery pack is used to supply power to the electric device.

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