Battery pack and electric device with same

Abstract

The invention discloses a battery pack and a power utilization device with the battery pack, the battery pack comprises a battery cell assembly and a coil, the battery cell assembly comprises a battery cell, the coil is arranged on the periphery of the battery cell assembly in a surrounding mode, and the magnetic field direction of the coil is parallel to the ion movement direction of the battery cell. According to the battery pack provided by the embodiment of the invention, the coil surrounding the periphery of the battery cell is arranged, and the magnetic field direction of the coil is arranged to be parallel to the ion movement direction of the battery cell, so that dendritic growth of foreign matters such as metal lithium and copper can be avoided to a certain extent in the charging and discharging process of the battery cell; therefore, the phenomenon that the diaphragm is punctured in the use process of the battery pack is avoided to a certain extent, the charge-discharge service life of the battery pack is prolonged, and the safety performance of the battery pack is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery pack and an electrical device having the same. Background Art

[0002] In the current market, with the gradual popularization of new energy vehicles, batteries have also been widely used, especially lithium batteries with the characteristics of high energy density, no memory, and long cycle life.

[0003] However, lithium batteries also have some problems during the charging and discharging process, such as capacity attenuation and reduced safety. Among them, a common failure phenomenon of lithium batteries is the formation of lithium dendrites, that is, lithium deposits irregular metal whiskers on the surface or inside the negative electrode, which makes the battery prone to increased internal resistance, decreased capacity and shortened cycle life. In severe cases, it may also cause internal short circuits in the battery and thermal runaway.

[0004] In the prior art, in order to solve the above problems, methods such as improving the electrolyte formula, adding additives, optimizing the charging and discharging conditions, or using a diaphragm with a special structure are usually adopted. However, the above improvement methods cannot fundamentally solve the formation of lithium dendrites, affecting the performance and efficiency of the battery pack. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery pack, which can avoid the growth of dendrites to a certain extent, thereby avoiding the problem of diaphragm puncture during the use of the battery pack to a certain extent, extending the charge and discharge life of the battery pack and improving the safety performance of the battery pack, solving the problem of dendrites being easily formed in the battery pack during use in the prior art.

[0006] The present invention also aims to provide an electrical device having the battery pack.

[0007] A battery pack according to an embodiment of the present invention includes: a cell assembly, the cell assembly including a cell; a coil, the coil is arranged around the periphery of the cell assembly, and the magnetic field direction of the coil is parallel to the ion movement direction of the cell.

[0008] According to the battery pack of the embodiment of the present invention, a coil is arranged around the outer periphery of the battery cell assembly, and the magnetic field direction of the coil is set to be parallel to the ion movement direction of the battery cell in the battery cell assembly. In this way, during the charge and discharge process of the battery cell, the dendritic growth of foreign matter such as metallic lithium and copper can be avoided to a certain extent, thereby avoiding the phenomenon of diaphragm puncture during the use of the battery pack to a certain extent, extending the charge and discharge life of the battery pack and improving the safety performance of the battery pack.

[0009] In some embodiments, the battery cell assembly includes a plurality of the battery cells, the plurality of the battery cells are arranged in an array, and the ion movement directions of the plurality of the battery cells are parallel.

[0010] In some embodiments, the magnetic induction intensity B generated by the coil after being energized is ≥ 200 mT.

[0011] In some embodiments, the battery pack further includes a protection component, wherein the protection component is sleeved on the outer periphery of the battery cell component, and the coil is disposed inside the protection component.

[0012] In some embodiments, the protection component includes: a first protective member, which is sleeved on the periphery of the battery cell assembly; a second protective member, which is sleeved on the periphery of the first protective member at intervals, and a cavity is formed between the first protective member and the second protective member, and the coil is arranged in the cavity and around the first protective member.

[0013] In some embodiments, the first protective member and / or the second protective member is a polytetrafluoroethylene member.

[0014] In some embodiments, the protection assembly further includes a support member, wherein the support member is disposed between the first protection member and the second protection member, and the support member is used to support the first protection member.

[0015] In some embodiments, the battery pack further includes a cooling element for reducing the temperature of the coil.

[0016] In some embodiments, the cooling member comprises a cooling plate, the cooling plate is suitable for being filled with cooling liquid, and the cooling plate is disposed in the cavity.

[0017] In some embodiments, the cooling plate is cooperatively connected to the inner peripheral wall of the second protective member.

[0018] In some embodiments, the battery pack further includes a detection element for detecting the temperature of the coil, and the cooling element is used to adjust the temperature of the coil according to the detection result of the detection element.

[0019] In some embodiments, the detection member is disposed in the cavity.

[0020] In some embodiments, the battery cell assembly further includes a shell, the interior of the shell is hollow to form a receiving cavity, the battery cell is disposed in the receiving cavity, and the protective assembly is sleeved on the outer periphery of the shell.

[0021] In some embodiments, the battery core includes a shell and a pole piece disposed in the shell, and the shell and / or the outer shell are made of paramagnetic material.

[0022] In some embodiments, a positioning groove is provided on the bottom wall of the accommodating cavity, and the battery cell is positioned and fitted in the positioning groove.

[0023] In some embodiments, the battery cell assembly further includes a heat exchanger, which exchanges heat with the battery cell and is used to adjust the temperature of the battery cell.

[0024] An electric device according to an embodiment of the present invention comprises the aforementioned battery pack, wherein the battery pack is used to supply power to the electric device.

[0025] According to the electric device of the embodiment of the present invention, by adopting the aforementioned battery pack, the operating performance of the electric device can be ensured while the use safety of the electric device can be improved.

[0026] Additional aspects and advantages of the invention will become apparent from the following description, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 Schematic diagram of a battery pack according to some embodiments of the present invention.

[0029] Figure 2 Schematic diagram of battery cell components according to some embodiments of the present invention.

[0030] Figure 3 This is a schematic diagram of the protection component and the coil in some embodiments of the present invention.

[0031] Figure 4 Schematic diagram of a tray according to some embodiments of the present invention.

[0032] Reference numerals:

[0033] 1000, battery pack;

[0034] 100. Battery cell assembly;

[0035] 110. Battery cell;

[0036] 120, housing; 121, accommodating cavity; 122, positioning groove; 123, tray;

[0037] 200, coil;

[0038] 300, protection assembly; 310, first protection member; 320, second protection member; 330, cavity;

[0039] 400, cooling parts; 500, testing parts. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] The battery pack 1000 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0043] Combination Figure 1 , Figure 2 and Figure 3 As shown, a battery pack 1000 according to an embodiment of the present invention includes: a battery cell assembly 100 and a coil 200 .

[0044] Among them, combined Figure 1 and Figure 2 As shown, the battery cell assembly 100 includes a battery cell 110 .

[0045] Combination Figure 1 , Figure 2 and Figure 3As shown, the coil 200 is arranged around the periphery of the battery cell assembly 100, and the direction of the magnetic field of the coil 200 is parallel to the direction of ion movement of the battery cell 110. Here, it means that the present application arranges the coil 200 around the periphery of the battery cell assembly 100, and sets the direction of the magnetic field of the coil 200 to be parallel to the direction of ion movement of the battery cell 110. When the direction of the magnetic field of the coil 200 is parallel to the direction of movement of the charged ions of the battery cell 110, a micro-magnetic hydrodynamics (micro-MHD) effect is generated, and the current is deflected on the surface of the lithium or copper foreign matter, generating a current component parallel to the current collector and a current component perpendicular to the current collector. The current component parallel to the current collector and the magnetic field perpendicular to the current collector generate the Lorentz force. The microscopic magnetohydrodynamics, due to its limited influence range, generates microscopic eddy currents at fixed positions, thereby redistributing lithium ions. Metal nucleation and growth are more inclined to 2D mode, which inhibits the growth of dendrites. Therefore, it is ultimately possible to effectively avoid the dendritic growth of foreign matter such as metallic lithium and copper during the operation of the battery pack 1000, making it less likely for the diaphragm to be punctured during the use of the battery pack 1000, thereby extending the charge and discharge life of the battery pack 1000, improving the safety performance of the battery pack 1000, and reducing the hazard of short circuits.

[0046] It should be noted that when the coil 200 is energized, the current direction of the coil 200 can induce a magnetic field, wherein the current direction of the coil 200 of the present application can be understood as Figure 3 The dashed arrow in the figure indicates the direction of Figure 3 It can be seen that the coil 200 of the present application can generate a magnetic field perpendicular to the paper surface and outward after being energized.

[0047] In addition, the ion movement direction of the battery cell 110 refers to the direction in which the ions are transmitted between the positive electrode and the negative electrode. Figure 2 In the direction of the solid arrow shown in Figure 2 and Figure 3 As shown, the magnetic field direction of the coil 200 of the present application is parallel to the ion movement direction of the battery core 110 .

[0048] At the same time, by forming the coil 200 as a part of the battery pack 1000 and arranging the coil 200 around the periphery of the battery cell assembly 100, the coil 200 is capable of moving with the battery cell assembly 100. In this way, the coil 200 can be used to provide a repair function during the use of the battery pack 1000, thereby improving the use efficiency of the coil 200 and enhancing the use safety of the battery pack 1000.

[0049] In other words, the battery pack 1000 of the present application can achieve in-situ regulation of the performance of the battery cell 110 during the charging and discharging process, which is a non-destructive regulation solution that does not require destroying the body structure of the battery pack 1000.

[0050] In summary, the present application utilizes the principle that charged particles undergo specific deflection in a magnetic field and that the magnetic field triggers the magnetohydrodynamic (micro-MHD) effect in the fluid to construct an electromagnetically coupled power battery package structure.

[0051] In a specific example, during the charging process of the battery pack 1000 (0.2C~3C AC or DC charging), the coil 200 is energized. When the coil 200 is energized, the current direction of the coil 200 can induce a magnetic field with a constant strength perpendicular to the paper surface and outward. After charging is completed, when the entire vehicle operates normally, the magnetic field remains in a closed state, so as to avoid the dendritic growth of foreign matter such as metallic lithium and copper during the use of the battery pack 1000 to a certain extent, extend the charge and discharge life of the battery pack 1000 and improve the safety performance of the battery pack 1000.

[0052] As can be seen from the above structure, the battery pack 1000 of the embodiment of the present invention is provided with a coil 200 surrounding the outer periphery of the battery cell assembly 100, and the magnetic field direction of the coil 200 is set to be parallel to the ion movement direction of the battery cell 110 in the battery cell assembly 100. In this way, during the charging and discharging process of the battery cell 110, the coil 200 can be used to avoid the dendritic growth of foreign matter such as metallic lithium and copper to a certain extent, thereby avoiding the phenomenon of diaphragm puncture during the use of the battery pack 1000 to a certain extent, thereby extending the charging and discharging life of the battery pack 1000 and improving the safety performance of the battery pack 1000.

[0053] At the same time, by setting the coil 200 in the battery pack 1000, the coil 200 can be used in real time to provide a repair function during the use of the battery pack 1000, thereby improving the use efficiency of the coil 200 and enhancing the use safety of the battery pack 1000.

[0054] It can be understood that compared with the prior art, the present application sets a coil 200 in the battery pack 1000, and sets the magnetic field direction of the coil 200 to be parallel to the ion movement direction of the battery cell 110, so as to realize the real-time use of the coil 200 to provide a repair function during the use of the battery pack 1000, to avoid the phenomenon of diaphragm puncture during the use of the battery pack 1000 to a certain extent, to extend the charge and discharge life of the battery pack 1000 and to improve the safety performance of the battery pack 1000.

[0055] It should be noted that when the direction of charge movement is perpendicular to the direction of the magnetic field, a macroscopic magnetohydrodynamic effect is generated. This large Lorentz force causes the ions to deflect in a specific direction, resulting in a denser surface, which may lead to the continuous deposition of metal ions at a certain site, accelerating the growth of dendrites. In view of the above theory's requirements for electrolyte fluidity, the battery cell 110 of the present application is a non-gel battery and a non-solid-state battery, and is mainly a lithium-ion battery injected with an electrolyte.

[0056] In some embodiments, Figure 2 As shown, the battery cell assembly 100 includes a plurality of battery cells 110, and the plurality of battery cells 110 are arranged in an array, and the ion movement directions of the plurality of battery cells 110 are parallel. Among them, by configuring the battery cell assembly 100 to include a plurality of battery cells 110, the cooperation of the plurality of battery cells 110 is conducive to increasing the capacity of the battery pack 1000 and improving the working performance of the battery pack 1000.

[0057] At the same time, by setting the ion movement directions of multiple battery cells 110 to be parallel, the ion movement directions of multiple battery cells 110 can be made parallel to the magnetic field direction of the coil 200, which is beneficial to using the coil 200 to effectively avoid the dendritic growth of foreign matter such as metallic lithium and copper during the use of the battery pack 1000, making it less likely for the diaphragm to be punctured during the use of the battery pack 1000, thereby extending the charge and discharge life of the battery pack 1000, improving the safety performance of the battery pack 1000, and reducing the hazard of short circuits.

[0058] It should be noted that the multiple battery cells 110 of the battery cell assembly 100 can be arranged as single cells or in a module form, and no specific limitation is made here.

[0059] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0060] In some embodiments, the magnetic induction intensity B generated after the coil 200 is energized is ≥ 200mT. Studies have shown that the growth of dendrites can be positively affected when the magnetic induction intensity B generated after the coil 200 is energized is ≥ 200mT. Therefore, by setting the magnetic induction intensity B generated after the coil 200 is energized to be greater than or equal to 200mT, the dendritic growth of foreign matter such as metallic lithium and copper can be avoided to a certain extent, making it less likely for the diaphragm to be pierced during the use of the battery pack 1000, extending the charge and discharge life of the battery pack 1000, improving the safety performance of the battery pack 1000, and reducing the risk of short circuits.

[0061] In some embodiments, the magnetic induction intensity B generated by the coil 200 after being energized is 200 mT, 300 mT, or 400 mT.

[0062] However, it should be noted that due to the different sizes and formulation systems of the battery cell 110, in the specific example, the magnetic induction intensity B generated after the coil 200 is energized may need to be adjusted according to the experimental results of the battery cell 110. At the same time, since B = μNI / Le (where μ is the magnetic permeability; N is the number of turns of the coil 200; I is the current of the coil 200; Le is the magnetic path length), the magnetic induction intensity generated after the coil 200 is energized can be changed by adjusting the number of turns of the coil 200, the current size and / or the effective path length.

[0063] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, the battery pack 1000 further includes a protection component 300, which is sleeved on the outer periphery of the battery cell component 100, and the coil 200 is disposed in the protection component 300. While the coil 200 is disposed on the outer periphery of the battery cell component 100, the protection component 300 can also be used to protect the battery cell component 100 and the coil 200.

[0064] Among them, when the protection component 300 is used to protect the battery cell assembly 100, it can prevent external foreign matter from damaging the battery cell assembly 100 to a certain extent, extend the service life of the battery cell assembly 100, and help improve the safety of the battery cell assembly 100; when the protection component 300 is used to protect the coil 200, the service life of the coil 200 can be extended.

[0065] In a specific embodiment, by placing the coil 200 in the protective component 300, on the one hand, some magnetic materials outside the magnetic field can be prevented from being sucked into the coil 200, thereby improving the performance of the coil 200. On the other hand, it can also prevent leakage of the battery core 110 or corrosion of the coil 200 by acids, alkalis and other substances, thereby extending the service life of the coil 200.

[0066] That is to say, by disposing the coil 200 in the protection component 300 , the coil 200 can be disposed around the outer periphery of the battery cell component 100 , and the performance of the coil 200 can be improved and the service life of the coil 200 can be extended.

[0067] In some embodiments, one end of the protection component 300 is open, so that the protection component 300 can be sleeved on the outer periphery of the battery cell component 100 to reduce the difficulty of assembling the protection component 300 and the battery cell component 100 .

[0068] In a specific example, the battery cell assembly 100 can be pushed into the protection assembly 300 through the opening, so that the protection assembly 300 is sleeved on the outer periphery of the battery cell assembly 100 .

[0069] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, the protection component 300 includes a first protection member 310 and a second protection member 320, and the first protection member 310 is sleeved on the outer periphery of the battery cell assembly 100. The protection component 300 is sleeved on the outer periphery of the battery cell assembly 100, and the difficulty of matching the protection component 300 with the battery cell assembly 100 is reduced, so that the coil 200 is conveniently arranged around the outer periphery of the battery cell assembly 100, so as to use the coil 200 to extend the charge and discharge life of the battery pack 1000 and improve the safety performance of the battery pack 1000.

[0070] In the description of the present invention, features defined as “first” or “second” may explicitly or implicitly include one or more such features, and are used to distinguish and describe the features, without any distinction in order or importance.

[0071] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, the second protective member 320 is sleeved at intervals on the outer periphery of the first protective member 310, a cavity 330 is formed between the first protective member 310 and the second protective member 320, and the coil 200 is arranged in the cavity 330 and arranged around the first protective member 310. Here, it means that when the second protective member 320 is sleeved at intervals on the outer periphery of the first protective member 310, a cavity 330 is formed between the first protective member 310 and the second protective member 320, and the coil 200 is arranged in the cavity 330 and arranged around the first protective member 310. Since the first protective member 310 is sleeved on the outer periphery of the battery cell assembly 100, the coil 200 can be arranged around the outer periphery of the battery cell assembly 100, reducing the difficulty of matching the coil 200 with the battery cell assembly 100, so that it is convenient to use the coil 200 to extend the charge and discharge life of the battery pack 1000 and improve the safety performance of the battery pack 1000.

[0072] At the same time, by placing the coil 200 in the cavity 330 , the difficulty of assembling the coil 200 and the protection component 300 can be reduced, so that the protection component 300 can be used to protect the coil 200 , improve the performance of the coil 200 , and extend the service life of the coil 200 .

[0073] In summary, the present application adopts the principle that the coil 200 can generate a magnetic field when energized, constructs a cavity 330 on the periphery of the battery cell assembly 100, and places the coil 200 in the cavity 330, and by adjusting the current intensity and the number of turns of the coil 200, the magnetic induction intensity generated after the coil 200 is energized is adjusted, so as to avoid the dendritic growth of foreign matter such as metallic lithium and copper to a certain extent, so that the problem of diaphragm puncture is not likely to occur during the use of the battery pack 1000, thereby extending the charge and discharge life of the battery pack 1000 and improving the safety performance of the battery pack 1000.

[0074] At the same time, in addition to the stable magnetic field, alternating current can be introduced to derive an alternating magnetic field to meet the needs of different power systems.

[0075] In some embodiments, the first protective member 310 and / or the second protective member 320 is a polytetrafluoroethylene member. Here, it means that the first protective member 310 is a polytetrafluoroethylene member; or the second protective member 320 is a polytetrafluoroethylene member; or the first protective member 310 and the second protective member 320 are both polytetrafluoroethylene members.

[0076] When the first protective member 310 is a polytetrafluoroethylene member, since the first protective member 310 is sleeved on the outer periphery of the battery cell assembly 100 , it can prevent leakage of the battery cell 110 or corrosion of the coil 200 by acids, alkalis and other substances to a certain extent, thereby extending the service life of the coil 200 .

[0077] When the second protective member 320 is a polytetrafluoroethylene member, it can prevent some magnetic substances outside the magnetic field from being sucked into the coil 200 to a certain extent and affect the performance of the coil 200, thereby further improving the performance of the coil 200.

[0078] When the first protective member 310 and the second protective member 320 are both polytetrafluoroethylene members, the present application is equivalent to adding a polytetrafluoroethylene unfilled cavity on the periphery of the battery cell assembly 100, which can be well insulated, so that the cavity 330 can withstand the impact of high voltage electricity, so that the coil 200 can generate a higher magnetic induction intensity after being energized, thereby ensuring the working performance of the coil 200 to a certain extent.

[0079] At the same time, when the first protective member 310 and the second protective member 320 are both polytetrafluoroethylene members, the following advantages are also achieved:

[0080] First, polytetrafluoroethylene can withstand corrosion from strong acids, strong alkalis and organic solvents and is almost insoluble in any solvents, thus ensuring chemical corrosion resistance of the protective component 300, thereby ensuring the performance of the protective component 300 and extending the service life of the protective component 300.

[0081] Second: Since the operating temperature range of polytetrafluoroethylene is between -200°C and 260°C, the operating temperature can reach 300°C for a short time, thereby improving the high temperature resistance of the protection component 300, so that the cavity 330 can also remain stable in a high temperature environment.

[0082] Third: During the movement of the vehicle, the coil 200 may rub against or collide with the first protective member 310 and the second protective member 320. Since the friction coefficient of polytetrafluoroethylene is extremely low, by setting the first protective member 310 and the second protective member 320 to be polytetrafluoroethylene members, the long service life of the coil 200 can be ensured, and the coil 200 can be used for a long time under high temperature and high speed conditions, thereby extending the service life of the coil 200.

[0083] Fourth: Because polytetrafluoroethylene is an insulating material, the coil 200 can work under high voltage electricity, which becomes the prerequisite for the controllable magnetic field.

[0084] In summary, by configuring the first protective member 310 and the second protective member 320 to be polytetrafluoroethylene members, the coil 200 can be guaranteed to work long-term, safely and stably.

[0085] Of course, in some other embodiments, the first protection member 310 and the second protection member 320 may also be ordinary plastic members.

[0086] In some embodiments, the protection assembly 300 further includes a support member (not shown in the figure), which is disposed between the first protection member 310 and the second protection member 320, and is used to support the first protection member 310. This improves the position stability of the first protection member 310, thereby stabilizing the relative position of the first protection member 310 and the second protection member 320 disposed at intervals, so as to form a stable cavity 330 between the first protection member 310 and the second protection member 320, so that the coil 200 can be disposed in the cavity 330, thereby ensuring the working performance of the coil 200 to a certain extent.

[0087] In some embodiments, the support member is a support plate, which is disposed on opposite sides of the first protective member 310 and fixedly connected to the second protective member 320, so as to realize supporting the first protective member 310 by the support member, improve the position stability of the first protective member 310, and reduce the difficulty of supporting the first protective member 310.

[0088] In some embodiments, Figure 1 As shown, the battery pack 1000 further includes a cooling member 400, which is used to reduce the temperature of the coil 200. It should be noted that when the magnetic induction intensity generated by the coil 200 after being energized is large, there may be a problem of heat dissipation. By providing the cooling member 400 to reduce the temperature of the coil 200, it is possible to avoid serious heat generation of the coil 200 when it is energized to a certain extent, reduce safety risks, and help extend the service life of the coil 200.

[0089] In some embodiments, in combination Figure 1 and Figure 3 As shown, the cooling member 400 includes a cooling plate, the cooling plate is suitable for being filled with a coolant, and the cooling plate is arranged in the cavity 330. Among them, by configuring the cooling member 400 to include a cooling plate and filling the cooling plate with a coolant, the cooling member 400 is used to reduce the temperature of the coil 200, thereby reducing the difficulty of adjusting the temperature of the coil 200, so that the temperature of the coil 200 during operation can be maintained within a suitable temperature range, thereby extending the service life of the coil 200.

[0090] At the same time, since the coil 200 is disposed in the cavity 330, by disposing the cooling plate in the cavity 330, the cooling plate can be disposed close to the coil 200, so that the temperature of the coil 200 can be reduced by using the cooling plate, thereby reducing the difficulty of temperature regulation of the coil 200.

[0091] In a specific example, when the cooling plate is disposed in the cavity 330 , the cooling plate is used to reduce the temperature of the detection cavity 330 , ensure the stability of the temperature inside the cavity 330 , so as to achieve the purpose of reducing the temperature of the coil 200 and reduce the difficulty of adjusting the temperature of the coil 200 .

[0092] In addition, by arranging the cooling plate in the cavity 330, the first protective member 310 and the second protective member 320 can cooperate to protect the cooling plate, thereby extending the service life of the cooling plate.

[0093] In some embodiments, the cooling plate is connected with the inner peripheral wall of the second protective member 320. Here, when the cooling plate is arranged in the cavity 330, the cooling plate is connected with the inner peripheral wall of the second protective member 320, so that the cooling plate can be supported by the second protective member 320, the position stability of the cooling plate can be improved, and the performance of the cooling plate can be improved to a certain extent.

[0094] In some embodiments, the cooling plate is fixedly connected to the inner peripheral wall of the second protective member 320 to increase the connection strength between the cooling plate and the second protective member 320 and improve the position stability of the cooling plate.

[0095] The fixed connection between the cooling plate and the inner wall of the second protective member 320 mentioned here may be bonding, clamping, etc.

[0096] At the same time, by connecting the cooling plate with the inner wall of the second protective member 320, the cooling plate can be prevented from occupying the space on the periphery of the first protective member 310 to a certain extent, so as to facilitate the arrangement of the coil 200 on the periphery of the first protective member 310 and reduce the difficulty of arranging the coil 200.

[0097] In some embodiments, Figure 1 As shown, the battery pack 1000 further includes a detection member 500, which detects the temperature of the coil 200, and the cooling member 400 is used to adjust the temperature of the coil 200 according to the detection result of the detection member 500. Thus, the temperature of the coil 200 can be accurately adjusted, so that the temperature of the coil 200 can be maintained within a suitable temperature range when powered on, and the working performance of the coil 200 can be improved while the service life of the coil 200 can be extended.

[0098] It should be noted that the detection element 500 mentioned here can be understood as a temperature sensing device, such as a temperature sensor or a thermometer, etc. The temperature of the coil 200 is detected by using the temperature sensor or the thermometer to adjust the temperature of the coil 200, reduce the difficulty of detecting the temperature of the coil 200, and improve the accuracy of the detection, thereby extending the service life of the coil 200.

[0099] In some embodiments, the battery pack 1000 also includes a controller (not shown in the figure), which is electrically connected to the cooling element 400 and the detection element 500, respectively. The detection element 500 is used to detect the temperature of the coil 200 in real time and send the detected result to the controller. When the controller determines that the temperature of the coil 200 is high, the controller controls the cooling element 400 to work, so as to utilize the cooling element 400 to reduce the temperature of the coil 200.

[0100] In a specific example, when the temperature of the coil 200 is ≥80°C, the controller controls the cooling member 400 to turn on to cool the coil 200; when the temperature of the coil 200 is ≤30°C, the controller controls the cooling member 400 to exit cooling, thereby reducing the use cost of the cooling member 400 and extending the service life of the coil 200.

[0101] In some embodiments, in combination Figure 1 and Figure 3 As shown, the detection member 500 is disposed in the cavity 330. Since the coil 200 is disposed in the cavity 330, by disposing the detection member 500 in the cavity 330, the detection member 500 can be disposed close to the coil 200, so that it is convenient to use the detection member 500 to detect the temperature of the coil 200, and the difficulty of detecting the temperature of the coil 200 is reduced.

[0102] At the same time, by disposing the detection member 500 in the cavity 330 , the first protection member 310 and the second protection member 320 can cooperate to protect the detection member 500 , thereby extending the service life of the detection member 500 .

[0103] It should be noted that, since the coil 200 is located in the cavity 330 , when the detection element 500 is disposed in the cavity 330 , the detection element 500 can be directly used to detect the temperature of the cavity 330 , thereby achieving the purpose of detecting the temperature of the coil 200 and reducing the difficulty of detecting the temperature of the coil 200 .

[0104] Among them, when the detection component 500 is used to detect the temperature of the cavity 330, when it is detected that the temperature of the cavity 330 is ≥80°C, the controller controls the cooling component 400 to turn on to cool the cavity 330, so as to achieve the purpose of cooling the coil 200; when the temperature of the coil 200 is ≤30°C, the controller controls the cooling component 400 to exit cooling.

[0105] In some embodiments, in combination Figure 1 and Figure 3 As shown, the detection member 500 is disposed on the inner peripheral wall of the second protective member 320 and is fixedly connected to the inner peripheral wall of the second protective member 320. While the detection member 500 is disposed in the cavity 330, the second protective member 320 can also be used to support the detection member 500, thereby improving the position stability of the detection member 500 and improving the detection performance of the detection member 500 to a certain extent.

[0106] The fixed connection between the detection member 500 and the inner peripheral wall of the second protection member 320 mentioned here may be bonding, clamping, etc.

[0107] At the same time, by arranging the detection member 500 on the inner wall of the second protective member 320, it is also possible to avoid the detection member 500 occupying the space on the periphery of the first protective member 310 to a certain extent, so as to facilitate the arrangement of the coil 200 on the periphery of the first protective member 310 and reduce the difficulty of arranging the coil 200.

[0108] In some embodiments, in combination Figure 1 and Figure 2 As shown, the battery cell assembly 100 further includes a housing 120, the interior of the housing 120 is hollow to form a receiving cavity 121, the battery cell 110 is disposed in the receiving cavity 121, and the protection assembly 300 is sleeved on the outer periphery of the housing 120. Among them, by arranging the battery cell 110 in the receiving cavity 121, the battery cell 110 can be arranged in the housing 120, so as to realize the protection and support of the battery cell 110 by the housing 120, extend the service life of the battery cell 110, improve the position stability of the battery cell 110, and ensure the working performance of the battery cell 110 to a certain extent.

[0109] At the same time, by sleeved the protection component 300 on the periphery of the outer shell 120, the protection component 300 can be sleeved on the periphery of the battery cell assembly 100. While utilizing the protection component 300 to protect the battery cell assembly 100, the coil 200 can also be arranged around the periphery of the battery cell assembly 100, which is beneficial to utilizing the coil 200 to extend the charge and discharge life of the battery pack 1000 and improve the safety performance of the battery pack 1000.

[0110] In some embodiments, the shell 120 is made of paramagnetic material. Since the paramagnetic material has a weak shielding ability against magnetic fields, it will not affect the magnetic field on the migration of ions inside the battery cell 110, thereby preventing the shell 120 from affecting the magnetic field to inhibit the growth of dendrites of foreign bodies such as metal lithium and copper.

[0111] In some embodiments, the shell 120 may be made of aluminum, so that the shell 120 becomes a paramagnetic material.

[0112] Among them, the relative magnetic permeability of aluminum μr≈1.00002.

[0113] Of course, in some other embodiments, the housing 120 may also be a plastic part.

[0114] In some embodiments, the battery cell 110 includes a shell and a pole piece disposed in the shell, and the shell of the battery cell 110 is a paramagnetic material. This can prevent the shell of the battery cell 110 from affecting the magnetic field on the migration of ions inside the battery cell 110 to a certain extent, thereby preventing the shell of the battery cell 110 from affecting the magnetic field to inhibit the growth of dendrites of foreign bodies such as metal lithium and copper.

[0115] In some embodiments, the shell of the battery cell 110 may be made of aluminum-plastic film and aluminum, so that the shell of the battery cell 110 becomes a paramagnetic material.

[0116] In some embodiments, in combination Figure 1 , Figure 2 and Figure 4 As shown, the bottom wall of the accommodating cavity 121 is provided with a positioning groove 122, and the battery cell 110 is positioned and matched in the positioning groove 122. On the one hand, the difficulty of assembling the battery cell 110 can be reduced, and on the other hand, the positioning groove 122 can be used to limit and fix the position of the battery cell 110, thereby improving the position stability of the battery cell 110.

[0117] In some embodiments, in combination Figure 1 , Figure 2 and Figure 4 As shown, the housing 120 includes a tray 123, which is disposed in the accommodating cavity 121 and on the bottom wall of the accommodating cavity 121, and a positioning groove 122 is provided on the tray 123. The positioning groove 122 is provided on the bottom wall of the accommodating cavity 121, and the difficulty of forming the positioning groove 122 is reduced.

[0118] In some embodiments, the tray 123 may be formed as an integral piece with the bottom wall of the accommodating cavity 121 , so that the tray 123 is formed as a part of the side wall of the housing 120 , thereby reducing the difficulty of fixing the tray 123 .

[0119] In other embodiments, the tray 123 may be formed as a separate part from the bottom wall of the accommodating cavity 121 , so that the tray 123 and the side wall of the housing 120 are formed as a separate part, thereby reducing the difficulty of molding the tray 123 .

[0120] In some embodiments, during the assembly of the battery cell 110, the battery cell 110 is positioned and fitted in the positioning groove 122, and the ion movement direction of the battery cell 110 is perpendicular to the paper surface, and the magnetic field direction of the coil 200 is also perpendicular to the paper surface. This placement method can realize the influence of the above-mentioned micro magnetohydrodynamics (micro-MHD) to achieve the use of the coil 200 to avoid the dendritic growth of foreign matter such as metallic lithium and copper, extend the charge and discharge life of the battery pack 1000 and improve the safety performance of the battery pack 1000.

[0121] In some embodiments, the battery cell assembly 100 further includes a heat exchanger (not shown in the figure), which exchanges heat with the battery cell 110 and is used to adjust the temperature of the battery cell 110. This allows the temperature of the battery cell 110 to be maintained within a suitable temperature range during operation, thereby extending the life of the battery cell 110, improving the safety of the battery cell 110, and ensuring the working performance of the battery cell 110 to a certain extent, thereby ensuring the working performance of the battery cell 110, and thus ensuring the working performance of the battery pack 1000.

[0122] The adjusting the temperature of the battery cell 110 mentioned here includes increasing the temperature of the battery cell 110 and decreasing the temperature of the battery cell 110 .

[0123] In a specific example, when the temperature of the battery cell 110 is higher than a preset temperature range, the heat exchange element is used to lower the temperature of the battery cell 110; when the temperature of the battery cell 110 is lower than the preset temperature range, the heat exchange element is used to increase the temperature of the battery cell 110 so that the temperature of the battery cell 110 can be maintained within an appropriate temperature range.

[0124] In some embodiments, the heat exchange element is a heat exchange tube or a heat exchange plate, and the heat exchange tube or the heat exchange plate is filled with a heat exchange medium (such as a refrigerant), and the heat exchange medium exchanges heat with the battery cell 110 to adjust the temperature of the battery cell 110.

[0125] In some embodiments, the battery cell assembly 100 also includes a BMS (Battery Management System), which is used to intelligently manage and maintain the battery cell 110, prevent the battery cell 110 from being overcharged and over-discharged, extend the service life of the battery cell 110 and monitor the status of the battery cell 110.

[0126] It should be noted that due to the introduction of the magnetic field in the battery pack 1000, the BMS and the like need to be shielded from the magnetic field to ensure the normal operation of the components. Therefore, in some embodiments, protective devices such as a magnetic shielding protective cover and a magnetic shielding coating are installed at the BMS to protect the BMS.

[0127] In addition, the battery cell 110 of the present application may be a lithium metal battery, a lithium oxygen battery, a lithium sulfur battery, a sodium ion battery, etc.

[0128] The following describes an electric device according to an embodiment of the present invention.

[0129] An electric device according to an embodiment of the present invention includes a battery pack 1000 , and the battery pack 1000 is used to supply power to the electric device.

[0130] The battery pack 1000 is the aforementioned battery pack 1000 , and the specific structure of the battery pack 1000 is not described in detail herein.

[0131] It can be seen from the above structure that the electric device according to the embodiment of the present invention adopts the aforementioned battery pack 1000 to ensure the working performance of the electric device and improve the safety of the electric device.

[0132] It should be noted that the electrical devices of the present application include but are not limited to vehicles, ships, spacecraft, etc.

[0133] Among them, when the electrical device is a vehicle, the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.

[0134] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0135] Other components of the battery pack 1000 and the electrical device having the same according to the embodiment of the present invention, such as the specific structure inside the battery pack 1000, the specific structure and cooling principle of the cooling element 400, and the specific structure and heat exchange principle of the heat exchange element, are known to ordinary technicians in the field and will not be described in detail here.

[0136] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0137] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A battery cell assembly (100), the battery cell assembly (100) comprising a battery cell (110); A coil (200) is arranged around the outer periphery of the battery core assembly (100), and the magnetic field direction of the coil (200) is parallel to the ion movement direction of the battery core (110).

2. The battery pack according to claim 1, characterized in that: The battery cell assembly (100) comprises a plurality of battery cells (110), the plurality of battery cells (110) are arranged in an array, and the ion movement directions of the plurality of battery cells (110) are parallel.

3. The battery pack according to claim 1, characterized in that: The magnetic induction intensity B generated by the coil (200) after being energized is ≥200 mT.

4. The battery pack according to claim 1, characterized in that: It also includes a protection component (300), wherein the protection component (300) is sleeved on the outer periphery of the battery core component (100), and the coil (200) is arranged inside the protection component (300).

5. The battery pack according to claim 4, characterized in that: The protection component (300) comprises: A first protective member (310), the first protective member (310) being sleeved on the outer periphery of the battery cell assembly (100); A second protective member (320), wherein the second protective member (320) is spaced apart and sleeved on the outer periphery of the first protective member (310), a cavity (330) is formed between the first protective member (310) and the second protective member (320), and the coil (200) is arranged in the cavity (330) and around the first protective member (310).

6. The battery pack according to claim 5, characterized in that: The first protective member (310) and / or the second protective member (320) is a polytetrafluoroethylene member.

7. The battery pack according to claim 5, characterized in that: The protection component (300) further comprises a support member, wherein the support member is arranged between the first protection member (310) and the second protection member (320), and the support member is used to support the first protection member (310).

8. The battery pack according to claim 5, characterized in that: Also included is a cooling member (400) for reducing the temperature of the coil (200).

9. The battery pack according to claim 8, characterized in that: The cooling element (400) comprises a cooling plate, the cooling plate is suitable for being filled with cooling liquid, and the cooling plate is arranged in the cavity (330).

10. The battery pack according to claim 9, characterized in that: The cooling plate is cooperatively connected to the inner peripheral wall of the second protective member (320).

11. The battery pack according to claim 8, characterized in that: It also includes a detection member (500) for detecting the temperature of the coil (200), and the cooling member (400) is used to adjust the temperature of the coil (200) according to the detection result of the detection member (500).

12. The battery pack according to claim 11, characterized in that: The detection element (500) is disposed in the cavity (330).

13. The battery pack according to claim 4, characterized in that: The battery cell assembly (100) further comprises a housing (120), the interior of the housing (120) being hollow to form a receiving cavity (121), the battery cell (110) being arranged in the receiving cavity (121), and the protection assembly (300) being sleeved on the outer circumference of the housing (120).

14. The battery pack according to claim 13, characterized in that: The battery core (110) comprises a shell and a pole piece arranged in the shell, and the shell and / or the outer shell (120) are made of paramagnetic material.

15. The battery pack according to claim 13, characterized in that: The bottom wall of the accommodating cavity (121) is provided with a positioning groove (122), and the battery cell (110) is positioned and fitted in the positioning groove (122).

16. The battery pack according to any one of claims 1 to 15, characterized in that: The battery cell assembly (100) further comprises a heat exchange component, the heat exchange component performs heat exchange with the battery cell (110), and the heat exchange component is used to adjust the temperature of the battery cell (110).

17. An electrical device, characterized in that: It comprises a battery pack according to any one of claims 1 to 16, wherein the battery pack is used to supply power to the electrical device.

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