Battery, battery pack, and electric device

Abstract

The present invention provides a battery, a battery pack, and an electric device. The battery comprises: a case, a jelly roll, and an inner tube column. The case is provided with an accommodating cavity. The jelly roll is arranged in the accommodating cavity. The jelly roll is provided with a cavity passing through the jelly roll in the axial direction of the jelly roll. The inner tube column is arranged in the cavity. An end sealing plate is arranged at the bottom end of the inner tube column. The end sealing plate is located in the cavity. The distance between the end sealing plate and the bottom of the jelly roll is greater than 0. The inner tube column is provided with an inner cavity. A heat conducting member is arranged in the inner cavity. The present invention is used for solving the technical problem of poor heat dissipation effect of a battery.

Description

A battery, a battery pack, and an electrical device

[0001] This application claims priority to Chinese Patent Application No. 202410803341.6, filed on June 20, 2024, entitled “A Battery, Battery Pack and Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more particularly to a battery, battery pack, and electrical device. Background Technology

[0003] Batteries are a very common energy storage component that can be used in new energy devices, such as new energy vehicles and drones. As the requirements for battery charging and discharging speeds become higher and higher, the total heat generated by batteries also increases, and the resulting safety issues cannot be ignored.

[0004] Because new energy vehicles continuously engage in fast charging and high-power discharging during charging or driving, heat easily accumulates inside the battery, resulting in poor heat dissipation. This affects the battery's cycle life and safety, thus requiring cooling. Currently, serpentine cooling tubes are typically installed on the side of the battery for heat dissipation. Heat travels from the center of the battery through the coil to the side where it comes into contact with water-cooling pipes for cooling. However, the actual cooling effect is unsatisfactory.

[0005] Therefore, it is urgent to solve the technical problem of poor heat dissipation of batteries. Summary of the Invention

[0006] This invention provides a battery, a battery pack, and an electrical device to solve the technical problem of poor heat dissipation in batteries.

[0007] To achieve the above objectives, the present invention provides a battery comprising:

[0008] A housing having a receiving cavity inside;

[0009] A core, wherein the core is disposed within the accommodating cavity, and the core has an internal cavity extending through the core along its axial direction;

[0010] An inner tube column is disposed within the cavity. An end cap is provided at the bottom end of the inner tube column and is located within the cavity. The distance between the end cap and the bottom of the core is greater than 0. The inner tube column has an inner cavity, and a heat-conducting element is disposed within the inner cavity.

[0011] The battery provided by this invention increases the thermal contact area by setting an inner tube column in the cavity inside the core and a heat-conducting component inside the inner tube column, which helps to dissipate the heat generated inside the core in a timely manner and improves the heat dissipation effect of the battery. In addition, since the distance between the end seal plate and the bottom of the core is greater than 0, there is still space in the depth direction of the cavity that is not occupied by the inner tube column. This space can be used to store electrolyte, preventing problems such as low electrolyte injection efficiency, poor electrolyte wetting of the core, and cycle failure caused by insufficient electrolyte. It can also avoid excessive internal pressure after long-term use of the battery, which may cause safety hazards and improve the safety of battery use.

[0012] In one possible implementation, the ratio of the height L1 of the inner tube within the cavity to the depth L2 of the cavity satisfies: 0.5 ≤ L1 / L2 ≤ 0.8;

[0013] The diameter D1 of the cavity is: 1mm≤D1≤30mm.

[0014] In one possible implementation, the housing includes a housing body and an electrode post disposed on the housing body, an insulating element is disposed between the housing body and the electrode post, the insulating element separates the housing body and the electrode post, a through hole is formed in the electrode post, and one end of the inner tube post relative to the end sealing plate extends through the through hole to the top of the electrode post.

[0015] In one possible implementation, the heat-conducting element includes a first heat-conducting element having a first inner shell, one end of the first inner shell facing the end seal plate being a closed end, and one end of the first inner shell opposite the closed end being an open end. A partition is disposed inside the first inner shell, the partition dividing the interior of the first inner shell into an inlet channel and an outlet channel, and a flow channel is formed between the partition and the closed end of the first inner shell; or...

[0016] The heat-conducting component includes a second heat-conducting component, the second heat-conducting component having a second inner shell, both ends of the second inner shell being closed ends, and the second inner shell being filled with a phase change material; or,

[0017] The thermal conductive component includes a third thermal conductive component, which is a thermally conductive adhesive.

[0018] In one possible implementation, the heat-conducting element is fitted against the inner wall of the cavity; or,

[0019] The space between the heat-conducting component and the inner wall of the cavity is filled with thermally conductive adhesive.

[0020] In one possible implementation, the core includes a first electrode, a second electrode, and a diaphragm stacked and wound together, the diaphragm being spaced between the first electrode and the second electrode;

[0021] A first current collector is also provided between the core and the pole piece, and the pole piece and the first pole piece are electrically connected through the first current collector;

[0022] A second current collector is also provided between the core and the bottom wall of the shell body, and the shell body and the second electrode are electrically connected through the second current collector.

[0023] In one possible implementation, an explosion-proof valve is provided on the bottom wall of the shell body, and the diameter D2 of the explosion-proof valve is: 20mm≤D1≤40mm.

[0024] In one possible implementation, the inner tube is made of a metallic material; when the metallic material of the first or second electrode located on the inner surface of the cavity is different from that of the inner tube, an insulating coating is provided on the outer wall surface of the inner tube; or,

[0025] The inner tubular column is made of insulating and thermally conductive material.

[0026] The present invention also provides a battery pack comprising at least two batteries as described in any one of claims 1-8, wherein the batteries are connected in series or in parallel via conductive elements.

[0027] In one possible implementation, the battery pack further includes a liquid cooling plate disposed on the terminal post of the battery, with an insulating layer between the liquid cooling plate and the terminal post, and the inner tube post of the battery connected to the liquid cooling plate.

[0028] In one possible implementation, the battery's thermal conductive component includes a first thermal conductive component, the open end of the first inner shell of which communicates with the interior of the liquid cooling plate, allowing the coolant inside the liquid cooling plate to circulate through the inlet channel, flow channel, and outlet channel of the first thermal conductive component; or,

[0029] The battery's heat-conducting component includes a second heat-conducting component, which is connected to the liquid cooling plate; or,

[0030] The battery's heat-conducting component includes a third heat-conducting component, and an insulating heat-conducting cover plate is disposed between the third heat-conducting component and the liquid cooling plate.

[0031] The present invention also provides an electrical device, including an electrical device body and the aforementioned battery pack.

[0032] In one possible implementation, the electrical equipment body includes a vehicle.

[0033] The present invention provides a battery, battery pack and electrical equipment that allows the heat at the center of the battery core to be transferred to the liquid cooling plate at the top of the battery through the coolant during fast charging or high-power discharge. This effectively disperses and absorbs the heat generated inside the battery, keeping the battery within a reasonable operating temperature range, ensuring its charging and discharging performance, battery safety and lifespan, and reducing the problem of spontaneous combustion caused by battery overheating in automobiles and other electrical equipment.

[0034] The present invention provides a battery, a battery pack and an electrical device, wherein the inner cavity of the inner tube column is not through hole, so that the space located below the inner tube column in the cavity can store part of the electrolyte, thereby improving the electrolyte injection efficiency, improving the wetting effect of the first and second electrodes of the core with electrolyte, and improving the problem of circulation drop caused by insufficient electrolyte.

[0035] The present invention provides a battery, battery pack, and electrical device that achieves cooling thermal management by simultaneously introducing coolant into the first heat-conducting component inside the core and the liquid cooling plate at the top of the battery. Compared with the traditional cooling method for cylindrical cells, this method can further increase the heat dissipation area of ​​the battery, reduce heat accumulation at the center of the core and the terminal positions, and improve safety issues such as unbalanced discharge, power limitation, accelerated battery aging rate, deterioration of battery cycle life, and even thermal runaway caused by excessive temperature rise and temperature difference under fast charging or high-rate conditions.

[0036] In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by a battery, battery pack, and electrical equipment provided by the embodiments of the present invention, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific embodiments. Attached Figure Description

[0037] Figure 1 is an exploded view of the battery provided in an embodiment of the present invention;

[0038] Figure 2 is a cross-sectional view of the battery provided in an embodiment of the present invention;

[0039] Figure 3 is an enlarged view of the structure at point A in Figure 2;

[0040] Figure 4 is a cross-sectional view of another battery provided in an embodiment of the present invention;

[0041] Figure 5 is a cross-sectional view of another battery provided in an embodiment of the present invention;

[0042] Figure 6 is an exploded view of a battery pack provided in an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached drawings: 10-Shell; 11-Shell body; 12-Electrical post; 121-Through hole; 122-Conductive component; 13-Insulating component; 131-First insulating component; 132-Second insulating component; 14-Accommodating cavity; 15-Bottom wall; 20-Core; 21-Cavity; 22-First electrode; 23-Second electrode; 24-Separator; 30-Inner tube column; 31-End sealing plate; 311-Insulating and heat-conducting cover plate; 32-Inner cavity; 40-Liquid cooling plate; 50-Insulating layer; 60-First current collector; 70-Second current collector; 80-Heat-conducting component; 81-Separator; 82-Flow passage; 90-Explosion-proof valve; 100-Battery. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0045] Among related technologies, there are two common liquid cooling solutions:

[0046] The first method is radial cooling of cylindrical cells: a serpentine water-cooling pipe is installed on the side of the cylindrical cell. Heat travels from the center of the cell, through the core, to the side of the cylindrical cell where it contacts the serpentine water-cooling pipe, thus achieving both cooling and heating functions. However, due to the limited actual contact area between the serpentine water-cooling pipe and the outer circumference of the cylindrical cell, and the long flow path of the coolant within the serpentine water-cooling pipe, the actual cooling effect is poor, and a significant temperature difference still exists between the inside and outside of the cell.

[0047] The second method is axial cooling of cylindrical cells: a water-cooling plate is placed at the bottom of the cell, allowing heat to be transferred downwards along the core to the bottom of the cell casing, where it contacts the water-cooling plate to achieve both cooling and heating of the cylindrical battery. Disadvantages of this axial cooling solution: only the bottom of each cell contacts the water-cooling plate, resulting in a small contact area, approximately 50%–60% of the side cooling area, leading to poor overall cooling performance. Furthermore, placing the water-cooling plate at the bottom of the cell requires it to also serve as a load-bearing structure, or add another layer of structural support, increasing the space occupied in the height direction of the battery. This can negatively impact the interior space layout of a vehicle when the battery is installed.

[0048] In view of this, the present invention provides a battery, battery pack, and electrical device that, by setting an inner tube column in the cavity inside the core and setting a heat-conducting component in the inner tube column, increases the thermal contact area, which helps to dissipate the heat generated inside the core in a timely manner and improves the heat dissipation effect of the battery. In addition, since the distance between the end seal plate and the bottom of the core is greater than 0, there is still space in the depth direction of the cavity that is not occupied by the inner tube column. This space can be used to store electrolyte, preventing problems such as low electrolyte injection efficiency, poor electrolyte wetting of the core, and insufficient electrolyte causing cycle leakage. It can also avoid excessive internal pressure after long-term use of the battery, which could cause safety hazards and improve the safety of battery use.

[0049] The following description, with reference to the accompanying drawings, describes the battery, battery pack, and electrical equipment provided in the embodiments of the present invention.

[0050] The batteries provided in the embodiments of the present invention include, but are not limited to, cylindrical batteries, prismatic batteries, and batteries of other shapes.

[0051] Referring to Figures 1 and 2, the present invention provides a battery 100, comprising: a housing 10, a core 20, and an inner tube 30. The housing 10 has a receiving cavity 14; the core 20 is disposed in the receiving cavity 14, and the core 20 has a cavity 21 extending through the core 20 along its axial direction; the inner tube 30 is disposed in the cavity 21, and an end sealing plate 31 is provided at the bottom end of the inner tube 30, and the end sealing plate 31 is located in the cavity 21. The distance between the end sealing plate 31 and the bottom of the core 20 is greater than 0. The inner tube 30 has an inner cavity 32, and a heat-conducting element 80 is disposed in the inner cavity 32.

[0052] The present invention provides a battery 100, which increases the thermal contact area by setting an inner tube 30 in the cavity 21 inside the core 20 and a heat-conducting element 80 in the inner tube 30, which helps to dissipate the heat generated inside the core 20 in a timely manner and improves the heat dissipation effect of the battery 100. In addition, since the distance between the end sealing plate 31 and the bottom of the core 20 is greater than 0, there is still space in the depth direction of the cavity 21 that is not occupied by the inner tube 30. This space can be used to store electrolyte, preventing problems such as low electrolyte injection efficiency, poor electrolyte wetting of the core 20, and insufficient electrolyte causing cycle leakage. It can also avoid excessive internal pressure of the battery 100 after long-term use, which could cause safety hazards and improve the safety of the battery 100.

[0053] In one possible implementation, the inner tube 30 is made of a metallic material, including but not limited to steel, aluminum, or copper.

[0054] When the metal material of the first electrode 22 or the second electrode 23 located on the inner surface of the cavity 21 is different from the metal material of the inner tube column 30, an insulating coating is provided on the outer wall surface of the inner tube column 30. For example, when the electrode located on the inner surface of the cavity 21 is the first electrode 22, and the material of the inner tube column 30 is different from the material of the current collector of the first electrode 22, an insulating coating needs to be provided on the outer wall surface of the inner tube column 30 to achieve an insulating effect. Alternatively, when the electrode located on the inner surface of the cavity 21 is the second electrode 23, and the material of the inner tube column 30 is different from the material of the current collector of the second electrode 23, an insulating coating needs to be provided on the outer wall surface of the inner tube column 30 to achieve an insulating effect.

[0055] When the electrode located on the inner surface of the cavity 21 is the first electrode 22, and the material of the inner tube 30 is the same as the material of the current collector of the first electrode 22, an insulating coating may not be required on the outer wall of the inner tube 30.

[0056] When the electrode located on the inner surface of the cavity 21 is the second electrode 23, and the material of the inner tube 30 is the same as the material of the current collector of the second electrode 23, an insulating coating may not be required on the outer wall of the inner tube 30.

[0057] In other possible implementations, the inner tube 30 may also be made of an insulating and thermally conductive material, such as one or more combinations of polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), and polyimide (PI).

[0058] In one possible implementation, the cavity 21 may be located at the center of the core 20 to improve the heat conduction and dissipation effect at the center of the core 20.

[0059] In one possible implementation, the housing 10 can be a steel or aluminum shell, and the housing 10 can be cylindrical, rectangular, or the like.

[0060] In one possible implementation, the ratio of the height L1 of the inner tube 30 located in the cavity 21 to the depth L2 of the cavity 21 satisfies: 0.5≤L1 / L2≤0.8.

[0061] It is easy to understand that if L1 / L2 is too large, the space left for storing the electrolyte will be smaller, which will not only reduce the electrolyte injection efficiency but also affect the wetting effect of the core 20. Conversely, if L1 / L2 is too small, the height L1 of the inner tube 30 will be too small, which is not conducive to the rapid dissipation of heat generated inside the core 20. This application, by controlling L1 / L2, avoids excessively affecting the electrolyte injection speed, ensuring the electrolyte wetting effect, and also ensures that the heat generated inside the core 20 can be quickly dissipated, thus exhibiting good overall performance.

[0062] In one possible implementation, L1 / L2 could be, for example, 0.5, 0.6, 0.63, 0.7, or 0.8.

[0063] In one possible implementation, the diameter D1 of the cavity 21 is: 1mm≤D1≤30mm.

[0064] In one possible implementation, the diameter D1 of the cavity 21 can be, for example, 1 mm, 5 mm, 10 mm, 20 mm, 25 mm or 30 mm.

[0065] In one possible implementation, the housing 10 includes a housing body 11 and an electrode post 12 disposed on the housing body 11. An insulating member 13 is disposed between the housing body 11 and the electrode post 12, the insulating member 13 separating the housing body 11 and the electrode post 12. A through hole 121 is provided in the electrode post 12, and one end of the inner tube post 30 relative to the end sealing plate 31 extends through the through hole 121 to the top of the electrode post 12.

[0066] The casing body 11 can serve as the negative output terminal, and the terminal 12 as the positive output terminal. The insulating component 13 separates the casing body 11 and the terminal 12, thereby preventing the battery 100 from short-circuiting. Alternatively, the casing body 11 can serve as the positive output terminal, and the terminal 12 as the negative output terminal.

[0067] In one possible implementation, the insulating member 13 includes a first insulating member 131 and a second insulating member 132. The first insulating member 131 includes a first portion and a second portion connected to each other. The first portion is disposed on the side of the pole post 12 facing the core 20, and the second portion is disposed between the outer peripheral surface of the pole post 12 and the opening at the top of the housing body 11, so that the pole post 12 and the housing body 11 are completely separated. The second insulating member 132 may be sleeved on the outer peripheral surface of the inner tube post 30 to separate the outer peripheral surface of the inner tube post 30 from the pole post 12.

[0068] In one possible implementation, referring to FIG4, the heat-conducting component 80 includes a first heat-conducting component having a first inner shell, one end of the first inner shell facing the end sealing plate 31 being a closed end, and the other end of the first inner shell relative to the closed end being an open end, and a partition 81 being provided inside the first inner shell, the partition 81 separating the interior of the first inner shell into an inlet channel and an outlet channel, and a flow passage 82 being formed between the partition 81 and the closed end of the first inner shell.

[0069] In one possible implementation, the two side walls of the partition 81 are respectively connected to the opposite inner walls of the first inner shell, so that the liquid inlet channel and the liquid outlet channel extend along the axial direction of the core 20. This helps to increase the flow path length of the coolant entering the first inner shell, increase the contact time and contact area between the coolant and the first inner shell, and carry out sufficient heat exchange, thereby improving the heat dissipation effect and ensuring the stability of the entire battery 100 structure.

[0070] In one possible implementation, referring to FIG6, the heat conductor 80 includes a second heat conductor having a second inner shell, both ends of which are closed ends, and the second inner shell is filled with a phase change material.

[0071] In this example, both ends of the second inner shell have covers, and the edges of the covers are connected to the side walls of the second inner shell, so that both ends of the second inner shell are closed ends, thereby sealing the phase change material inside the second inner shell.

[0072] When the second inner shell is filled with phase change material, the heat generated by the core 20 is transferred to the phase change material. The phase change material absorbs heat and changes from a liquid state to a gaseous state or a gas-liquid mixture, which lowers the temperature of the core 20. The phase change material then comes into contact with the liquid cooling plate 40 through the second inner shell. The phase change material exchanges heat with the coolant flowing inside the liquid cooling plate 40, which dissipates heat and changes from a gaseous state or a gas-liquid mixture to a liquid state. This cycle is repeated to achieve the effect of cooling the core 20 and preventing heat from accumulating inside the core 20, thereby improving the safety of the core 20 in use.

[0073] In this example, cooling efficiency can be improved by using a phase change material to cool the coupled liquid cooling plate 40, thereby enhancing the performance and safety of the battery 100. The phase change material can be any existing material, and is not specifically limited here; for example, it could be paraffin or a composite phase change material.

[0074] In one possible implementation, referring to Figure 5, the thermally conductive element 80 includes a third thermally conductive element, which is a thermally conductive adhesive. In this example, the thermally conductive adhesive is filled within the inner cavity 32 of the inner tube column 30, eliminating the need for a first or second inner shell within the inner cavity of the inner tube column 30. This simplifies the structure of the battery 100 and effectively reduces the internal temperature of the battery 100, preventing overheating and thus improving the safety of the battery 100.

[0075] In one possible implementation, the open end of the first inner shell is used to communicate with the interior of the liquid cooling plate 40, so that the coolant inside the liquid cooling plate 40 circulates through the inlet channel, the flow channel 82, and the outlet channel. Referring to Figure 4, the arrow inside the first inner shell indicates the flow direction of the coolant. This structure enables the first inner shell and the liquid cooling plate 40 to be simultaneously supplied with coolant for mixed cooling thermal management, which can further increase the heat dissipation area of ​​the battery 100 and reduce the heat accumulation at the center of the core 20 and the position of the terminal post 12. This can improve the problems of excessive temperature rise and temperature difference of the battery 100 caused by fast charging or high-rate operation, as well as the problems of unbalanced discharge, power limitation, and accelerated aging rate of the battery 100, thereby improving the cycle life of the battery 100 and solving the safety problem of thermal runaway caused by the inability to dissipate heat in the core 20 in a timely and effective manner.

[0076] In one possible implementation, the second heat-conducting element is used to connect with the liquid cooling plate 40. One end of the second heat-conducting element is connected to the outer wall of the liquid cooling plate 40 for heat exchange. The coolant flowing inside the liquid cooling plate 40 continuously carries away the heat conducted by the second heat-conducting element, thereby achieving the effect of heat dissipation for the inside of the core 20.

[0077] In one possible implementation, the heat-conducting element 80 is fitted against the inner wall of the cavity 32.

[0078] In one possible implementation, thermally conductive adhesive is used to fill the gap between the heat-conducting element 80 and the inner wall of the inner cavity 32. The thermally conductive adhesive filling the gap between the heat-conducting element 80 and the inner wall of the inner cavity 32 improves the adhesion between the heat-conducting element 80 and the inner tube 30, thereby enhancing heat conduction.

[0079] In one possible implementation, referring to Figures 2 and 3, the core 20 includes a first electrode 22, a second electrode 23, and a diaphragm 24 stacked and wound together, with the diaphragm 24 spaced between the first electrode 22 and the second electrode 23; a first current collector 60 is also provided between the core 20 and the pole post 12, and the pole post 12 and the first electrode 22 are electrically connected through the first current collector 60; a second current collector 70 is also provided between the core 20 and the bottom wall 15 of the shell body 11, and the shell body 11 and the second electrode 23 are electrically connected through the second current collector 70.

[0080] In this design, one of the first electrode 22 and the second electrode 23 is a positive electrode, and the other is a negative electrode. The positive electrode includes a positive current collector, the surface of which has a coated area and an empty foil area. The coated area is coated with a positive electrode coating, and the empty foil area is connected to a positive electrode tab. The positive current collector can be made of aluminum foil. The negative electrode includes a negative current collector, part of which is coated with a negative electrode coating, and the surface of the uncoated negative current collector is connected to a negative electrode tab. The negative current collector can be made of copper foil.

[0081] After the positive and negative electrodes are cut, stacked, or flattened, the positive electrode is electrically connected to the first current collector 60 via laser welding, achieving electrical conductivity between the positive electrode and the first current collector 60. Similarly, the negative electrode is electrically connected to the second current collector 70 via laser welding, achieving electrical conductivity between the negative electrode and the second current collector 70. The first current collector 60 is connected to the terminal post 12 via laser welding. After high-temperature baking and open negative pressure liquid injection, the second current collector 70 is laser welded to the bottom wall 15 of the casing body 11 for encapsulation, resulting in the battery 100.

[0082] In one possible implementation, the diaphragm 24 is a microporous membrane, for example, it may be a polyolefin-based membrane.

[0083] In one possible implementation, referring to Figures 2 and 3, an explosion-proof valve 90 is provided on the bottom wall 15 of the housing body 11. The diameter D2 of the explosion-proof valve 90 is 20mm ≤ D1 ≤ 40mm. The wall thickness of the explosion-proof valve 90 is less than the thickness of the bottom wall 15 of the housing body 11, so that if the internal and external pressure difference of the battery 100 is too large, the battery 100 will burst through the explosion-proof valve 90.

[0084] In one possible implementation, the diameter of the explosion-proof valve 90 can be, for example, 20mm, 22mm, 25mm, 27mm, 30mm, 31mm, 35mm, 37mm or 40mm.

[0085] When a short circuit occurs inside the battery 100, causing thermal runaway, the grooves on the explosion-proof valve will break under the action of the internal and external pressure difference, which can effectively achieve thermal and electrical separation and improve the safety of the power battery 100.

[0086] The present invention also provides a battery pack comprising at least two of the aforementioned batteries 100, which are connected in series or parallel via conductive elements 122. The conductive elements 122 may be, for example, tabs, which are welded to the outer surface of the terminal post 12, enabling the positive output terminals of multiple batteries 100 to be connected in series or parallel. Similarly, the top of the casing body 11 is also connected in parallel or series via tabs, enabling the connection of the negative output terminals of the batteries 100. Thermally conductive adhesive is filled between the terminal post 12 after the tabs are welded and the liquid cooling plate 40, which increases the stability and thermal conductivity of the connection between the terminal post 12 and the liquid cooling plate 40.

[0087] In one possible implementation, the present invention provides a battery pack comprising a plurality of the aforementioned batteries 100, wherein the housings 10 of the plurality of batteries 100 may be arranged side by side in several rows, and the plurality of batteries 100 are connected to a liquid cooling plate 40, thereby achieving the effect of heat dissipation for each battery 100 when the coolant in the liquid cooling plate 40 circulates.

[0088] In one possible implementation, referring to FIG6, the battery pack further includes a liquid cooling plate 40 disposed on the terminal post 12, with an insulating layer 50 disposed between the liquid cooling plate 40 and the terminal post 12, and the inner tube post 30 of the battery 100 connected to the liquid cooling plate 40.

[0089] In one possible implementation, a buckle is provided at one end of the inner tube column 30 relative to the end sealing plate 31, and a slot is provided on the side of the liquid cooling plate 40 facing the liquid cooling plate 40. By snapping the buckle into the slot, one end of the inner tube column 30 relative to the end sealing plate 31 is detachably connected to the liquid cooling plate 40, so that the liquid cooling plate 40 can be disassembled and connected.

[0090] In one possible implementation, the insulating layer 50 can be an insulating varnish coated on the surface of the liquid cooling plate 40, which serves to insulate between the liquid cooling plate 40 and the electrode post 12. Compared to a structure in which insulating adhesive is applied between the liquid cooling plate 40 and the electrode post 12, this can prevent insulation failure between the liquid cooling plate 40 and the electrode post 12 due to uneven application of the structural adhesive.

[0091] In one possible implementation, the heat-conducting component 80 of the battery 100 includes a first heat-conducting component. The open end of the first inner shell of the first heat-conducting component communicates with the interior of the liquid cooling plate 40, allowing the coolant inside the liquid cooling plate 40 to circulate through the inlet channel, flow channel 82, and outlet channel of the first heat-conducting component. This liquid cooling system, utilizing the coolant flowing within the liquid cooling plate 40, helps improve heat dissipation at the center of the battery 100 and provides better safety during use.

[0092] In one possible implementation, the heat-conducting element 80 of the battery 100 includes a second heat-conducting element connected to the liquid cooling plate 40. When the phase change material filled in the second heat-conducting element is utilized, the heat generated by the winding core 20 is transferred to the phase change material. The phase change material absorbs heat and changes from a liquid state to a gaseous state or a gas-liquid mixture, thereby reducing the temperature of the winding core 20. The phase change material then contacts the liquid cooling plate 40 through the second inner shell, and exchanges heat with the coolant flowing inside the liquid cooling plate 40, causing the phase change material to dissipate heat and change from a gaseous state or a gas-liquid mixture to a liquid state. This cycle is repeated to achieve the effect of cooling the winding core 20, preventing heat from accumulating inside the winding core 20, and thus improving the safety of the winding core 20 in use.

[0093] In one possible implementation, the heat-conducting component 80 of the battery 100 includes a third heat-conducting component, and an insulating heat-conducting cover plate 311 is disposed between the third heat-conducting component and the liquid cooling plate 40. Heat is transferred between the third heat-conducting component and the liquid cooling plate 40 through the insulating heat-conducting cover plate 311, thereby achieving the effect of heat dissipation.

[0094] The present invention also provides an electrical device, including an electrical device body and the aforementioned battery pack.

[0095] In one possible implementation, the electrical equipment includes, but is not limited to, intelligent electric products such as drones and driverless vehicles, or power tools.

[0096] In one possible implementation, the electrical equipment itself includes a vehicle, such as an electric vehicle or a hybrid vehicle.

[0097] The present invention provides a battery, a battery pack and an electrical device, wherein the inner cavity 32 of the inner tube column 30 is not through hole, so that the space located below the inner tube column 30 in the cavity 21 can store part of the electrolyte, thereby improving the electrolyte injection efficiency, improving the wetting effect of the first electrode 22 and the second electrode 23 of the core 20 with electrolyte, and improving the problem of cycle drop caused by insufficient electrolyte.

[0098] The present invention provides a battery, battery pack, and electrical device that achieves cooling thermal management by simultaneously introducing coolant into the first heat-conducting component inside the core 20 and the liquid cooling plate 40 at the top of the battery. Compared with the traditional cooling method for cylindrical cells, this method can further increase the heat dissipation area of ​​the battery and reduce heat accumulation at the center of the core 20 and the terminal post 12. This can improve safety issues such as unbalanced discharge, power limitation, accelerated battery aging rate, and deteriorated cycle life caused by excessive temperature rise and temperature difference under fast charging or high-rate conditions, which can lead to thermal runaway.

[0099] The present invention provides a battery, battery pack, and electrical device. By setting an inner tube column 30 in the cavity 21 inside the core 20, setting a heat-conducting component 80 in the inner tube column 30, and setting a liquid cooling plate 40 on the terminal post 12, the heat inside the core 20 can be transferred to the liquid cooling plate 40 on the top of the battery through the coolant during fast charging or high-power discharge. This can effectively disperse and absorb the heat generated inside the battery, keep the battery within a reasonable operating temperature range, ensure its charging and discharging performance, battery safety and lifespan, and reduce the problem of spontaneous combustion caused by battery overheating in new energy vehicles.

[0100] It should be noted that the numerical values ​​and ranges involved in this application are approximate values. Due to the influence of the manufacturing process, there may be a certain range of errors, which can be considered negligible by those skilled in the art.

[0101] In the description of this invention, it should be understood that the terms "center," "length," "width," "thickness," "top," "bottom," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," "outer," "axial," and "circumferential," etc., used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the indicated position or component must have a specific orientation, or a specific structure and operation, and therefore should not be construed as a limitation of this invention.

[0102] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0103] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0104] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions 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 invention.

Claims

1. A battery, characterized in that, include: A housing (10) having a receiving cavity (14) inside; The core (20) is disposed in the accommodating cavity (14) and the core (20) has a cavity (21) extending through the core (20) along the axial direction of the core (20); An inner tube column (30) is disposed in the cavity (21). An end sealing plate (31) is provided at the bottom end of the inner tube column (30) and the end sealing plate (31) is located in the cavity (21). The distance between the end sealing plate (31) and the bottom of the core (20) is greater than 0. The inner tube column (30) has an inner cavity (32) inside and a heat-conducting element (80) is disposed in the inner cavity (32).

2. The battery according to claim 1, characterized in that, The ratio of the height L1 of the inner tube (30) located in the cavity (21) to the depth L2 of the cavity (21) satisfies: 0.5≤L1 / L2≤0.8; The diameter D1 of the cavity (21) is: 1mm≤D1≤30mm.

3. The battery according to claim 1, characterized in that, The housing (10) includes a housing body (11) and an electrode post (12) disposed on the housing body (11). An insulating member (13) is disposed between the housing body (11) and the electrode post (12). The insulating member (13) separates the housing body (11) and the electrode post (12). A through hole (121) is provided in the electrode post (12). One end of the inner tube post (30) relative to the end sealing plate (31) extends to the top of the electrode post (12) through the through hole (121).

4. The battery according to claim 1, characterized in that, The heat-conducting component (80) includes a first heat-conducting component having a first inner shell. One end of the first inner shell facing the end cap (31) is a closed end, and the other end of the first inner shell relative to the closed end is an open end. A partition (81) is provided inside the first inner shell, dividing the interior of the first inner shell into an inlet channel and an outlet channel. A flow channel (82) is formed between the partition (81) and the closed end of the first inner shell; or... The heat-conducting component (80) includes a second heat-conducting component, the second heat-conducting component having a second inner shell, both ends of the second inner shell being closed ends, and the second inner shell being filled with a phase change material; or, The thermal conductive component (80) includes a third thermal conductive component, which is a thermally conductive adhesive.

5. The battery according to claim 1, characterized in that, The heat-conducting element (80) is in contact with the inner wall of the inner cavity (32); or, The space between the heat-conducting component (80) and the inner wall of the inner cavity (32) is filled with thermally conductive adhesive.

6. The battery according to claim 3, characterized in that, The core (20) includes a first electrode (22), a second electrode (23) and a diaphragm (24) stacked and wound together, wherein the diaphragm (24) is disposed between the first electrode (22) and the second electrode (23); A first current collector (60) is also provided between the core (20) and the pole post (12), and the pole post (12) and the first pole piece (22) are electrically connected through the first current collector (60); A second current collector (70) is also provided between the core (20) and the bottom wall (15) of the shell body (11), and the shell body (11) and the second electrode (23) are electrically connected through the second current collector (70).

7. The battery according to claim 3, characterized in that, An explosion-proof valve (90) is provided on the bottom wall (15) of the shell body (11), and the diameter D2 of the explosion-proof valve (90) is: 20mm≤D1≤40mm.

8. The battery according to claim 6, characterized in that, The inner tube (30) is made of metal. When the metal material of the first electrode (22) or the second electrode (23) located on the inner surface of the cavity (21) is different from the metal material of the inner tube (30), an insulating coating is provided on the outer wall surface of the inner tube (30); or, The inner tube column (30) is made of insulating and thermally conductive material.

9. A battery pack, characterized in that, It includes at least two batteries (100) as described in any one of claims 1-8, wherein the batteries (100) are connected in series or in parallel via conductive elements (122).

10. The battery pack according to claim 9, characterized in that, It also includes a liquid cooling plate (40), which is disposed on the terminal post (12) of the battery (100). An insulating layer (50) is disposed between the liquid cooling plate (40) and the terminal post (12). The inner tube post (30) of the battery (100) is connected to the liquid cooling plate (40).

11. The battery pack according to claim 10, characterized in that, The heat-conducting component (80) of the battery (100) includes a first heat-conducting component, the open end of the first inner shell of the first heat-conducting component being in communication with the interior of the liquid cooling plate (40) so that the coolant inside the liquid cooling plate (40) circulates to the inlet channel, the flow channel (82) and the outlet channel of the first heat-conducting component; or, The heat-conducting component (80) of the battery (100) includes a second heat-conducting component, which is connected to the liquid cooling plate (40); or, The heat-conducting component (80) of the battery (100) includes a third heat-conducting component, and an insulating heat-conducting cover plate (311) is provided between the third heat-conducting component and the liquid cooling plate (40).

12. An electrical appliance, characterized in that, It includes the electrical equipment body and the battery pack as described in any one of claims 9-11.

13. The electrical equipment according to claim 12, characterized in that, The electrical equipment body includes a car.

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