Battery monomer, battery pack, power utilization device and energy storage device

Abstract

The utility model discloses a single battery, a battery pack, a power utilization device and an energy storage device, and belongs to the technical field of batteries, and the single battery comprises a shell, an anti-explosion valve, a pole, a naked battery cell and a blocking piece. The explosion-proof valve is installed in the shell, the shell wall of the shell is used for installing the explosion-proof valve, and the shell wall is a target shell wall. The pole is mounted on the housing. The naked battery cell is arranged in the shell; the blocking piece is located between the naked battery cell and the target shell wall so as to limit the naked battery cell to make contact with the target shell wall. The explosion-proof valve is arranged on the target shell wall, and the blocking piece is arranged between the target shell wall and the naked battery cell. The blocking piece can inhibit the naked battery cell from getting close to the target shell wall, and when thermal runaway happens to the single battery, gas can smoothly flow to the outside through the anti-explosion valve. According to the embodiment of the invention, the condition that thermal runaway gas is difficult to discharge can be effectively relieved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells, battery units, battery packs, electrical devices and energy storage devices. Background Art

[0002] New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in energy storage, etc. Battery cells are usually equipped with explosion-proof valves to discharge thermal runaway gases in the battery cells.

[0003] In the related art, thermal runaway gas is difficult to discharge. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery cell, a battery pack, an electrical device and an energy storage device to alleviate the situation where thermal runaway gas is difficult to discharge.

[0005] This application is implemented through the following technical solutions.

[0006] A first aspect of an embodiment of the present application provides a battery cell, including:

[0007] shell;

[0008] An explosion-proof valve is installed in the housing, and the housing wall of the housing, the housing wall for installing the explosion-proof valve is a target housing wall;

[0009] A pole, mounted on the housing;

[0010] A bare cell is disposed in the housing, the bare cell has a pole ear, the pole ear is electrically connected to the pole, and the arrangement direction of the explosion-proof valve and the bare cell is a target direction;

[0011] A blocking member is located between the bare battery cell and the target shell wall to limit the bare battery cell from contacting the target shell wall. The blocking member forms a first air channel. The blocking member is connected to the first air channel on opposite sides along a preset direction. The preset direction is arranged crosswise with the target direction.

[0012] In the scheme of the embodiment of the present application, a blocking member is provided between the target shell wall and the bare cell. When thermal runaway occurs inside the battery cell, the bare cell may expand and deform or move upward, thereby blocking the explosion-proof valve, resulting in the inability to discharge the gas inside the shell, making it difficult to discharge the thermal runaway gas. The blocking member can inhibit the bare cell from approaching the target shell wall. When thermal runaway occurs in the battery cell, the gas can flow to the outside through the explosion-proof valve more smoothly through the first airway. The embodiment of the present application can effectively alleviate the situation where the thermal runaway gas is difficult to discharge.

[0013] In one embodiment, the melting point of the barrier element ranges from 200°C to 5000°C.

[0014] In the solution of the embodiment of the present application, the melting point of the barrier is within a suitable range so that when thermal runaway occurs inside the battery cell, the barrier will not be affected by the heat, thereby better inhibiting the bare battery cell from approaching the target shell wall.

[0015] In one embodiment, the blocking member is made of metal.

[0016] In the solution of the embodiment of the present application, the material of the blocking member is metal. The blocking member has high strength and can withstand large loads. In the case of thermal runaway of the battery cell or expansion of external loads, the blocking member can still maintain its original shape well, and the blocking member is relatively stable during operation.

[0017] In one embodiment, the blocking member is made of steel or aluminum.

[0018] In the solution of the embodiment of the present application, the material of the blocking member is steel or aluminum. The material of the blocking member is relatively common and can adapt to the internal working environment of the battery cell, play a role in limiting the contact between the bare battery cell and the target shell wall, and the cost of the battery cell is relatively low.

[0019] In one embodiment, the blocking member is connected to the target shell wall by welding.

[0020] In the solution of the embodiment of the present application, the blocking member is welded to the target shell wall, and the blocking member is fixed relative to the target shell wall, so that the wear between the blocking member and the target shell wall can be alleviated during the operation of the battery cell.

[0021] In one embodiment, the battery cell further includes an insulating member, and along the target direction, the insulating member is located between the blocking member and the bare battery cell.

[0022] In the solution of the embodiment of the present application, the battery cell is further provided with an insulating member, and the insulating member is located between the blocking member and the bare battery cell. The insulating member can alleviate the situation where the bare battery cell directly contacts the blocking member, thereby causing a short circuit.

[0023] In one embodiment, the insulating member is formed with an avoidance groove, the opening of the avoidance groove faces the target shell wall, and the blocking member is at least partially located in the avoidance groove.

[0024] In the solution of the embodiment of the present application, the insulating member is formed with an avoidance groove, and the blocking member is at least partially located in the avoidance groove. The avoidance groove can position the blocking member, and the avoidance groove can reduce the interference between the blocking member and the insulating member, and alleviate the wear of the insulating member by the blocking member during operation, so as to increase the service life of the insulating member.

[0025] In one embodiment, along the preset direction, the groove wall of the avoidance groove covers the blocking member.

[0026] In the solution of the embodiment of the present application, the groove wall of the avoidance groove covers the blocking member, and the avoidance groove can further reduce the movement of the blocking member along the preset direction and alleviate the short circuit between the blocking member and the bare battery cell.

[0027] In one embodiment, the pole is connected to the target shell wall, and the preset direction is the arrangement direction of the explosion-proof valve and the pole; at least one of the blocking members is a first blocking member, and the pole and the corresponding pole ear are both located between the corresponding first blocking member and the explosion-proof valve along the preset direction.

[0028] In the embodiment of the present application, the pole and the corresponding pole lug are located between the corresponding first blocking member and the explosion-proof valve, which can alleviate the situation where the thermal runaway gas is difficult to remove due to the deformation of the bare battery cell on the side of the pole and the corresponding pole lug facing away from the explosion-proof valve.

[0029] In one embodiment, the number of the poles is at least two, each of the poles is correspondingly provided with the pole ear, and along the preset direction, the poles are provided on opposite sides of the explosion-proof valve, and the pole ear and the side of the corresponding pole facing away from the explosion-proof valve are provided with the first blocking member.

[0030] In the embodiment of the present application, the pole ear and the side of the corresponding pole away from the explosion-proof valve are both provided with a first blocking member. Multiple first blocking members can effectively prevent the bare battery cell from approaching the target shell wall along the preset direction. The blocking member has a good blocking effect.

[0031] In one embodiment, the blocking member further forms a second air channel connected to the first air channel, and the second air channel extends along the target direction.

[0032] In the solution of the embodiment of the present application, the blocking member is further formed with a second air channel connected to the first air channel, and the second air channel extends along the arrangement direction of the explosion-proof valve and the bare battery cells. The second air channel can increase the channel for air flow, and increasing the air channel along the arrangement direction of the explosion-proof valve and the bare battery cells can make the gas flow to the explosion-proof valve smoother, thereby increasing the exhaust efficiency.

[0033] In one embodiment, the pole is connected to the target shell wall, the preset direction is the arrangement direction of the explosion-proof valve and the pole, at least one of the blocking members is a second blocking member, along the preset direction, the second blocking member is located between the first blocking member and the explosion-proof valve, and the pole and the corresponding pole ear are located between the first blocking member and the second blocking member.

[0034] In the embodiment of the present application, the second blocking member is located between the first blocking member and the explosion-proof valve, and the pole and the corresponding pole ear are located between the first blocking member and the second blocking member. The second blocking member is supported between the pole and the corresponding pole ear and the explosion-proof valve so that the gas can flow to the explosion-proof valve more smoothly along a preset direction. Furthermore, the second blocking member is located near the explosion-proof valve to further alleviate the situation where the bare battery cell blocks the explosion-proof valve and renders the explosion-proof valve ineffective.

[0035] In one embodiment, the number of the poles is at least two, each of the poles is electrically connected to the corresponding pole lug, and along the preset direction, the poles are arranged on opposite sides of the explosion-proof valve, and at least two of the second blocking members are located on both sides of the explosion-proof valve.

[0036] In the embodiment of the present application, at least two second blocking members are located on both sides of the explosion-proof valve along a preset direction. The plurality of second blocking members can further prevent the bare battery cells from blocking the explosion-proof valve, and the airflow is smooth.

[0037] In one embodiment, the battery cell is in a square shape.

[0038] In the embodiment of the present application, the battery cell is square in shape, and the blocking member, explosion-proof valve, pole ear and pole can be arranged along the length direction of the side length of the battery cell. The arrangement is more convenient and alleviates the interference between the components.

[0039] In one embodiment, the pole is connected to the target shell wall, the preset direction is the arrangement direction of the explosion-proof valve and the pole, and the side wall of the shell along the preset direction is spaced apart from the bare battery cell.

[0040] In the embodiment of the present application, the side wall of the shell is arranged at a distance from the bare battery cell, so that the heat generated by the bare battery cell during operation can be discharged more smoothly, and the heat dissipation performance of the battery cell is better.

[0041] A second aspect of the present application provides a battery pack, comprising:

[0042] Box;

[0043] Any of the above-mentioned battery units is arranged inside the box.

[0044] A third aspect of an embodiment of the present application provides an electrical device, including:

[0045] Device body;

[0046] The battery pack described in any of the above items is used to supply power to the device body.

[0047] A fourth aspect of an embodiment of the present application provides an energy storage device, comprising:

[0048] Install the container;

[0049] The battery pack described in any of the above items is arranged in the installation container.

[0050] Utility model effect:

[0051] Through the embodiment of the present application, a barrier is provided between the target shell wall and the bare cell. When thermal runaway occurs inside the battery cell, the bare cell may expand and deform or move upward, thereby blocking the explosion-proof valve, resulting in the inability to discharge the gas inside the shell, making it difficult to discharge the thermal runaway gas. The barrier can inhibit the bare cell from approaching the target shell wall. When thermal runaway occurs in the battery cell, the gas can flow to the outside through the first airway and the explosion-proof valve more smoothly. The embodiment of the present application can effectively alleviate the situation where thermal runaway gas is difficult to discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0053] Figure 1 An exploded view of the structure of a battery cell according to an embodiment of the present application;

[0054] Figure 2 A schematic structural diagram of a battery cell according to a first embodiment of the present application;

[0055] Figure 3 This is a schematic diagram of the structure of a blocking member according to an embodiment of the present application;

[0056] Figure 4 It is a schematic structural diagram of a battery cell according to the second embodiment of the present application.

[0057] Description of Reference Numerals

[0058] 1. Shell; 10. Target shell wall; 2. Explosion-proof valve; 2a. Target direction; 3. Pole; 3a. Preset direction; 4. Bare battery cell; 4a. Pole ear; 4b. Thickness direction; 5. First blocking member; 5a. First air channel; 5b. Second air channel; 5c. Empty slot; 6. Adapter; 7. Second blocking member; 8. Insulating member; 8a. Avoidance groove; 8b. Protrusion. DETAILED DESCRIPTION

[0059] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0062] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0064] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "top", "bottom", "upper", and "lower" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description. They do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0065] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0067] In the related art, the shell wall of the battery cell is provided with an explosion-proof valve. When the battery cell experiences thermal runaway, the gas inside the battery cell can flow to the outside through the explosion-proof valve, thereby alleviating the situation where the battery cell is damaged due to excessive internal air pressure. However, in the case of thermal runaway of the battery cell, the bare battery cell inside the battery cell may expand and deform, or flow upward to block the exhaust channel of the explosion-proof valve, making it difficult for the gas inside the battery cell to flow to the outside through the explosion-proof valve.

[0068] The embodiment of the present application provides a barrier between the bare battery cell 4 and the target shell wall 10 to inhibit the bare battery cell 4 from rising, thereby alleviating the problem of difficulty in discharging the thermal runaway gas.

[0069] The solution of the embodiments of the present application can be applied to, but is not limited to, a battery pack including a battery cell or a battery unit, and can also be applied to an electrical device including a battery cell and a battery pack.

[0070] The present application provides an electrical device, which includes a device body and a battery pack, and the battery pack is used to supply power to the device body.

[0071] An electric device is a device that uses electric energy as energy and realizes corresponding functions by consuming electric energy. For example, the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0072] The main body of the device refers to the main structure that consumes electric energy to achieve the corresponding function. For example, the power-consuming device can be a mobile phone, and the main body of the device is the part that can achieve functions such as communication, and the battery cell or battery pack supplies power to the part that can achieve functions such as communication. For example, the power-consuming device can be a car, and the main body of the device is the part that can be used for people to sit and can be driven on the road, and the battery cell or battery pack supplies power to the part that can be used for people to sit and can be driven on the road.

[0073] A battery pack refers to a device that can output electric energy. For example, electric energy can be output by a battery pack composed of battery cells. For example, electric energy can be output by a battery module composed of battery cells and a battery pack composed of battery modules.

[0074] The electrical device of an embodiment of the present application is taken as an example of a vehicle.

[0075] The vehicle provided in one embodiment of the present application may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery pack is provided inside the vehicle, and the battery pack may be provided at the bottom, head or tail of the vehicle. The battery pack may be used to power the vehicle, for example, the battery pack may be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller may be used to control the battery pack to power the motor. For example, the battery pack may be used for starting, navigating and operating power requirements of the vehicle during driving.

[0076] In some embodiments of the present application, the battery pack can be used not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0077] The present application also provides a battery pack, which includes a mounting shell and a battery cell, wherein the battery cell is disposed inside the mounting shell.

[0078] The present application also provides a battery unit, which includes at least two battery cells and one or at least two bars. The bars are electrically connected to two different battery cells, respectively. Exemplarily, the number of battery cells can be multiple, and the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are both connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells is placed in a box. Of course, multiple battery cells can be first connected in series, in parallel, or in mixed connection to form a battery module, and the multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and the whole formed by the multiple battery modules connected in series, in parallel, or in mixed connection is placed in the box. The battery pack may also include other structures. For example, the battery pack may also include a busbar component for realizing electrical connection between multiple battery cells.

[0079] The present application also provides an energy storage device, which includes a mounting container and a battery pack, wherein the battery pack is disposed in the mounting container.

[0080] This application also provides a battery cell, see Figures 1 to 4 The battery cell includes a shell 1, an explosion-proof valve 2, a pole 3, a bare cell 4 and a blocking member. The explosion-proof valve 2 is installed in the shell 1, and the shell wall of the shell 1, in which the explosion-proof valve 2 is installed, is the target shell wall 10. The pole 3 is installed in the shell 1. The bare cell 4 is arranged in the shell 1, and the bare cell 4 has a pole ear 4a, which is electrically connected to the pole 3, and the arrangement direction of the explosion-proof valve 2 and the bare cell 4 is the target direction 2a. The blocking member is located between the bare cell 4 and the target shell wall 10 to limit the bare cell 4 from contacting the target shell wall 10.

[0081] A battery cell is a basic unit that can realize the mutual conversion between chemical energy and electrical energy.

[0082] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0083] In the embodiment of the present application, the battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., but the embodiment of the present application is not limited to this.

[0084] Exemplarily, the present application does not limit the type of the bare battery cell 4 , and the bare battery cell 4 may be a square wound battery cell or a laminated battery cell.

[0085] The explosion-proof valve 2 refers to a component used to prevent the battery cell from exploding under abnormal circumstances. The valve of the explosion-proof valve 2 can remain closed under a certain pressure, and the valve opens when the internal gas pressure of the battery cell reaches a certain level to release the gas.

[0086] For example, see Figure 1 , the preset direction 3a is arranged perpendicular to the thickness direction 4b of the bare battery cell 4.

[0087] For example, see Figure 1 , the preset direction 3a is arranged perpendicular to the target direction 2a.

[0088] For example, see Figure 4 The length direction of the blocking member is arranged along the thickness direction 4b of the bare battery core 4.

[0089] Exemplarily, the battery cell further includes an adapter plate 6, which is respectively connected to the pole 3 and the corresponding second electrical connection.

[0090] In the solution of the embodiment of the present application, a blocking member is provided between the target shell wall 10 and the bare cell 4. When thermal runaway occurs inside the battery cell, the bare cell 4 may expand and deform or move upward, thereby blocking the explosion-proof valve 2, causing the gas inside the outer shell 1 to be unable to be discharged, making it difficult for the thermal runaway gas to be discharged. The blocking member can inhibit the bare cell 4 from approaching the target shell wall 10, and when thermal runaway occurs in the battery cell, the gas can flow to the outside through the first airway 5a and the explosion-proof valve 2 more smoothly. The embodiment of the present application can effectively alleviate the situation where the thermal runaway gas is difficult to discharge.

[0091] Exemplarily, the outer surface of the barrier is provided with an insulating coating.

[0092] Exemplarily, the insulating coating may be a spray coating of Teflon, epoxy resin, phenolic resin, polyethylene terephthalate, polypropylene, ceramic, or the like.

[0093] In one embodiment, the blocking member is made of metal.

[0094] In the solution of the embodiment of the present application, the material of the blocking member is metal. The blocking member has high strength and can withstand large loads. In the case of thermal runaway of the battery cell or expansion of external loads, the blocking member can still maintain its original shape well, and the blocking member is relatively stable during operation.

[0095] It is understandable that the present application is not limited to the material of the blocking member being metal. Exemplarily, the material of the blocking member is hard ceramic, quartz or other special fire-resistant and wear-resistant materials.

[0096] In one embodiment, the blocking member is made of steel or aluminum.

[0097] In the solution of the embodiment of the present application, the material of the blocking member is steel or aluminum. The material of the blocking member is relatively common and can adapt to the internal working environment of the battery cell, play a role in limiting the contact between the bare battery cell 4 and the target shell wall 10, and the cost of the battery cell is relatively low.

[0098] In one embodiment, the melting point of the barrier member ranges from 200°C to 5000°C.

[0099] Illustratively, the melting point of the barrier is 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, 800°C, 1000°C, 2000°C, 3000°C, 4000°C or 5000°C.

[0100] It is understandable that the melting point of the barrier can be obtained through experiments using instruments such as a differential thermal analyzer.

[0101] In the embodiment of the present application, the melting point of the barrier is within a suitable range so that when thermal runaway occurs inside the battery cell, the barrier will not be affected by the heat, thereby better inhibiting the bare battery cell 4 from approaching the target shell wall 10.

[0102] In one embodiment, the blocking member is connected to the target shell wall 10 by welding.

[0103] In the solution of the embodiment of the present application, the blocking member is welded to the target shell wall 10. The blocking member is fixed relative to the target shell wall 10. During the operation of the battery cell, the wear between the blocking member and the target shell wall 10 can be alleviated.

[0104] It is to be understood that the present application is not limited to the blocking member being connected to the target shell wall 10 by welding.

[0105] It is understandable that the embodiment of the present application is not limited to the blocking member being fixedly connected to the target shell wall 10. Exemplarily, the blocking member is movably located between the target shell wall 10 and the bare battery cell 4.

[0106] In one embodiment, the battery cell further includes an insulating member 8 , and along the target direction 2 a , the insulating member 8 is located between the blocking member and the bare battery cell 4 .

[0107] Exemplarily, the insulating member 8 is made of rubber or polyurethane.

[0108] In the solution of the embodiment of the present application, the battery cell is further provided with an insulating member 8, and the insulating member 8 is located between the blocking member and the bare battery cell 4. The insulating member 8 can alleviate the situation where the bare battery cell 4 directly contacts the blocking member, thereby causing a short circuit.

[0109] In one embodiment, please refer to Figure 4 A protrusion 8 b is formed on the side of the insulating member 8 facing away from the explosion-proof valve 2 , and the protrusion 8 b abuts against the bare battery cell 4 .

[0110] In the solution of the embodiment of the present application, a protrusion 8b is formed on the side of the insulating member 8 facing away from the explosion-proof valve 2, and the protrusion 8b abuts against the bare battery cell 4. The protrusion 8b can abut against the bare battery cell 4, which can reduce the movement of the bare battery cell 4 when the battery cell is in the working state. Furthermore, the protrusion 8b can reserve a certain installation space for the tab 4a of the bare battery cell 4, reducing the wear between the tab 4a and the insulating member 8.

[0111] It is understandable that the embodiments of the present application are not limited to the insulating member 8 being formed with the protrusion 8b abutting against the bare battery cell 4. Exemplarily, along the arrangement direction of the insulating member 8 and the bare battery cell 4, the insulating member 8 and the bare battery cell 4 are arranged at intervals.

[0112] In one embodiment, the pole 3 is connected to the target shell wall 10, the arrangement direction of the explosion-proof valve 2 and the pole 3 is a preset direction 3a, the number of protrusions 8b is at least two, and multiple protrusions 8b are arranged at intervals along the preset direction 3a, and the pole 3 and the corresponding pole ear 4a are located between two adjacent protrusions 8b along the preset direction 3a.

[0113] In the solution of the embodiment of the present application, the number of protrusions 8b is at least two, and the multiple protrusions 8b can be supported relatively stably between the insulating member 8 and the bare battery cell 4, which can further alleviate the wear between the tab 4a and the insulating member 8.

[0114] It is to be understood that the present application is not limited to the number of protrusions 8b being at least two. For example, the number of protrusions 8b is single.

[0115] In one embodiment, the insulating member 8 is formed with an avoidance groove 8a, the opening of the avoidance groove 8a faces the target shell wall 10, and the blocking member is at least partially located in the avoidance groove 8a.

[0116] In the solution of the embodiment of the present application, the insulating member 8 is formed with an avoidance groove 8a, and the blocking member is at least partially located in the avoidance groove 8a. The avoidance groove 8a can position the blocking member, and the avoidance groove 8a can reduce the interference between the blocking member and the insulating member 8, and alleviate the wear of the insulating member 8 by the blocking member during operation, so as to increase the service life of the insulating member 8.

[0117] In one embodiment, along the preset direction 3a, the groove wall of the avoidance groove 8a covers the blocking member.

[0118] In the solution of the embodiment of the present application, the groove wall of the avoidance groove 8a covers the blocking member, and the avoidance groove 8a can further reduce the movement of the blocking member along the preset direction 3a and alleviate the short circuit between the blocking member and the bare battery cell 4.

[0119] In one embodiment, the insulating member 8 is connected to a side of the target shell wall 10 facing the bare battery core 4 .

[0120] Exemplarily, the insulating member 8 is fixedly connected to the target shell wall 10 .

[0121] In the solution of the embodiment of the present application, the insulating member 8 is connected to the side of the target shell wall 10 facing the bare battery cell 4, which can alleviate the relative sliding of the insulating member 8 relative to the target shell wall 10 during the operation of the battery cell, thereby causing the bare battery cell 4 to short-circuit with the target shell wall 10.

[0122] In one embodiment, the pole 3 is connected to the target shell wall 10, and the preset direction 3a is the arrangement direction of the explosion-proof valve 2 and the pole 3; at least one blocking member is a first blocking member 5, and the pole 3 and the corresponding pole ear 4a are both located between the corresponding first blocking member 5 and the explosion-proof valve 2 along the preset direction 3a.

[0123] In the embodiment of the present application, the pole 3 and the corresponding pole ear 4a are both located between the corresponding first blocking member 5 and the explosion-proof valve 2, which can alleviate the situation where the thermal runaway gas is difficult to remove due to the deformation of the bare battery cell 4 on the side of the pole 3 and the corresponding pole ear 4a facing away from the explosion-proof valve 2.

[0124] In one embodiment, please refer to Figure 3 The number of the first air passages 5 a is at least two, and all the first air passages 5 a corresponding to each blocking member are arranged at intervals from each other.

[0125] It can be understood that the first air channel 5a extends along the preset direction 3a, so that the airflow can pass through the blocking member along the preset direction 3a.

[0126] In the solution of the embodiment of the present application, the number of the first air passages 5a is at least two. Multiple first air passages 5a can speed up the efficiency of airflow passing through the blocking member, and the airflow can be discharged from the explosion-proof valve 2 to the outside quickly, thereby alleviating the rapid increase of air pressure inside the housing 1.

[0127] It is to be understood that the present application is not limited to the number of the first air passages 5a being at least two. Exemplarily, the number of the first air passage 5a is one.

[0128] In one embodiment, please refer to Figure 3 The blocking member is further formed with a second air passage 5b communicating with the first air passage 5a, and the second air passage 5b extends along the target direction 2a.

[0129] Exemplarily, there are multiple second air passages 5 b, and the multiple second air passages 5 b are arranged at intervals.

[0130] In the solution of the embodiment of the present application, the blocking member is further formed with a second air channel 5b connected to the first air channel 5a, and the second air channel 5b extends along the arrangement direction of the explosion-proof valve 2 and the bare battery cell 4. The second air channel 5b can increase the channel for air flow, and increasing the air channel along the arrangement direction of the explosion-proof valve 2 and the bare battery cell 4 can make the gas flow to the explosion-proof valve 2 smoother, thereby increasing the exhaust efficiency.

[0131] In one embodiment, please refer to Figure 3 The blocking member is formed with an empty groove 5c, the empty groove 5c is open on a side away from the bare battery cell 4, and the first air channel 5a and the second air channel 5b are both connected to the empty groove 5c.

[0132] In the embodiment of the present application, the blocking member is formed with an empty groove 5c, and the relatively low weight of the blocking member can increase the overall weight of the battery cell, thereby increasing the energy density of the battery cell.

[0133] It is understandable that the present application is not limited to the blocking member having the empty groove 5c. Exemplarily, the blocking member is block-shaped, the first air channel 5a penetrates the blocking member along the preset direction 3a, and the second air channel 5b penetrates the blocking member along the arrangement direction of the explosion-proof valve 2 and the bare battery cell 4.

[0134] In one embodiment, please refer to Figure 4 The number of poles 3 is at least two, each pole 3 is correspondingly provided with a pole ear 4a, and poles 3 are provided on opposite sides of the explosion-proof valve 2 along the preset direction 3a, and the pole ear 4a and the side of the corresponding pole 3 away from the explosion-proof valve 2 are provided with a first blocking member 5.

[0135] Exemplarily, along the preset direction 3 a , a plurality of first blocking members 5 are arranged symmetrically along the center line of the battery cell.

[0136] In the embodiment of the present application, the pole ear 4a and the side of the corresponding pole 3 away from the explosion-proof valve 2 are both provided with a first blocking member 5. The plurality of first blocking members 5 can effectively prevent the bare battery cell 4 from approaching the target shell wall 10 along the preset direction 3a. The blocking member has a good blocking effect.

[0137] It is understandable that the present application is not limited to the first blocking member 5 being provided on both the pole ear 4a and the side of the corresponding pole column 3 facing away from the explosion-proof valve 2. Exemplarily, the number of the first blocking member 5 is single, and the first blocking member 5 is located on the side of one of the pole columns 3 and the corresponding pole ear 4a facing away from the explosion-proof valve 2.

[0138] In one embodiment, please refer to Figure 2 and Figure 4 , the pole 3 is connected to the target shell wall 10, and the preset direction 3a is the arrangement direction of the explosion-proof valve 2 and the pole 3; at least one blocking member is a second blocking member 7, and along the preset direction 3a, the second blocking member 7 is located between the first blocking member 5 and the explosion-proof valve 2, and the pole 3 and the corresponding pole ear 4a are located between the first blocking member 5 and the second blocking member 7.

[0139] Exemplarily, when projected along the arrangement direction of the explosion-proof valve 2 and the bare battery cells 4 , the outer contour of the second blocking member 7 is connected to the outer contour of the explosion-proof valve 2 .

[0140] In the embodiment of the present application, the second blocking member 7 is located between the first blocking member 5 and the explosion-proof valve 2, and the pole 3 and the corresponding pole lug 4a are located between the first blocking member 5 and the second blocking member 7. The second blocking member 7 is supported between the pole 3 and the corresponding pole lug 4a and the explosion-proof valve 2, so that the gas can flow smoothly along the preset direction 3a to the explosion-proof valve 2. Furthermore, the second blocking member 7 is located near the explosion-proof valve 2, which can further alleviate the situation where the bare battery cell 4 blocks the explosion-proof valve 2 and makes the explosion-proof valve 2 ineffective.

[0141] In one embodiment, please refer to Figure 4 There are at least two poles 3, each pole 3 is electrically connected to the corresponding pole ear 4a, poles 3 are arranged on opposite sides of the explosion-proof valve 2 along the preset direction 3a, and at least two second blocking members 7 are located on both sides of the explosion-proof valve 2.

[0142] In the embodiment of the present application, along the preset direction 3a, at least two second blocking members 7 are located on both sides of the explosion-proof valve 2. The multiple second blocking members 7 can further prevent the bare battery cell 4 from blocking the explosion-proof valve 2, and the airflow is smooth.

[0143] It is understandable that the present application is not limited to at least two second blocking members 7 being located on both sides of the explosion-proof valve 2. Exemplarily, the number of the second blocking members 7 is single.

[0144] In one embodiment, please refer to Figure 1 , the shape of the battery cell is square.

[0145] Exemplarily, when projected along the thickness direction 4 b of the bare battery cell 4 , the projected area of ​​the battery cell is a rectangle, and the blocking member, the pole lug 4 a , the pole 3 and the explosion-proof valve 2 are arranged along the long side of the rectangle.

[0146] In the embodiment of the present application, the battery cell is square in shape, and the blocking member, explosion-proof valve 2, pole ear 4a and pole 3 can be arranged along the length direction of the side length of the battery cell. The arrangement is more convenient and alleviates the interference between the components.

[0147] It is to be understood that the present application is not limited to the battery cell being in a square shape. Exemplarily, the battery cell is a cylindrical battery.

[0148] In one embodiment, the pole 3 is connected to the target shell wall 10, the preset direction 3a is the arrangement direction of the explosion-proof valve 2 and the pole 3, and the side wall of the shell 1 along the preset direction 3a is spaced apart from the bare battery cell 4.

[0149] In the embodiment of the present application, the side wall of the housing 1 is spaced apart from the bare battery cell 4 , so that the heat generated by the bare battery cell 4 during operation can be discharged more smoothly, and the heat dissipation performance of the battery cell is better.

[0150] It is understandable that the embodiments of the present application are not limited to the bare battery core 4 being spaced apart from the side wall of the housing 1. Exemplarily, the bare battery core 4 is fitted to the side wall of the housing 1.

[0151] In one embodiment, please refer to Figures 1 to 4The battery cell includes a shell 1, an explosion-proof valve 2, a pole 3, a bare cell 4 and a blocking member. The explosion-proof valve 2 is installed in the shell 1, and the shell wall of the shell 1, the shell wall for installing the explosion-proof valve 2 is the target shell wall 10. The pole 3 is connected to the target shell wall 10. The bare cell 4 is arranged in the shell 1, and the bare cell 4 has a pole ear 4a, and the pole ear 4a is electrically connected to the pole 3. The arrangement direction of the explosion-proof valve 2 and the bare cell 4 is the target direction 2a. The blocking member is located between the bare cell 4 and the target shell wall 10 to limit the contact between the bare cell 4 and the target shell wall 10. The blocking member is formed with a first air channel 5a, and the blocking member is connected to the first air channel 5a on opposite sides of the preset direction 3a, and the preset direction 3a is arranged crosswise with the target direction 2a. The material of the blocking member is metal. The blocking member is welded to the target shell wall 10. The battery cell also includes an insulating member 8, and the blocking member is located on the side of the insulating member 8 away from the bare battery cell 4 along the arrangement direction of the explosion-proof valve 2 and the bare battery cell 4. A protrusion 8b is formed on the side of the insulating member 8 away from the explosion-proof valve 2, and the protrusion 8b abuts against the bare battery cell 4. The number of protrusions 8b is at least two, and multiple protrusions 8b are arranged at intervals along the preset direction 3a, and the pole 3 and the corresponding pole ear 4a are located between two adjacent protrusions 8b. The protrusion 8b is formed with an avoidance groove 8a, the opening of the avoidance groove 8a faces the target shell wall 10, and the blocking member is at least partially located in the avoidance groove 8a. The insulating member 8 is connected to the side of the target shell wall 10 facing the bare battery cell 4. The melting point of the blocking member ranges from 200°C to 5000°C. The shape of the battery cell is square.

[0152] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope.

Claims

1. A battery cell, characterized in that: include: shell; An explosion-proof valve is installed in the housing, and the housing wall of the housing, the housing wall for installing the explosion-proof valve is a target housing wall; A pole, mounted on the housing; A bare cell is disposed in the housing, the bare cell has a pole ear, the pole ear is electrically connected to the pole, and the arrangement direction of the explosion-proof valve and the bare cell is a target direction; A blocking member is located between the bare battery cell and the target shell wall to limit the bare battery cell from contacting the target shell wall. The blocking member forms a first air channel. The blocking member is connected to the first air channel on opposite sides along a preset direction. The preset direction is arranged crosswise with the target direction.

2. The battery cell according to claim 1, characterized in that: The melting point of the barrier member ranges from 200°C to 5000°C.

3. The battery cell according to claim 2, characterized in that: The blocking member is made of metal.

4. The battery cell according to claim 3, characterized in that: The blocking member is made of steel or aluminum.

5. The battery cell according to claim 3, characterized in that: The blocking member is connected to the target shell wall by welding.

6. The battery cell according to claim 3, characterized in that: The battery cell further includes an insulating member, and along the target direction, the insulating member is located between the blocking member and the bare battery cell.

7. The battery cell according to claim 6, characterized in that: The insulating member is formed with an escape groove, the opening of the escape groove faces the target shell wall, and the blocking member is at least partially located in the escape groove.

8. The battery cell according to claim 7, characterized in that: Along the preset direction, the groove wall of the avoidance groove covers the blocking member.

9. The battery cell according to claim 1, characterized in that: The pole is connected to the target shell wall, and the preset direction is the arrangement direction of the explosion-proof valve and the pole; at least one of the blocking members is a first blocking member, and the pole and the corresponding pole ear are both located between the corresponding first blocking member and the explosion-proof valve along the preset direction.

10. The battery cell according to claim 9, characterized in that: The number of the poles is at least two, each of the poles is correspondingly provided with the pole ear, and along the preset direction, the poles are provided on opposite sides of the explosion-proof valve, and the pole ear and the side of the corresponding pole away from the explosion-proof valve are provided with the first blocking member.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The blocking member further forms a second air passage communicating with the first air passage, and the second air passage extends along the target direction.

12. The battery cell according to claim 9, characterized in that: The pole is connected to the target shell wall, the preset direction is the arrangement direction of the explosion-proof valve and the pole, at least one of the blocking members is a second blocking member, along the preset direction, the second blocking member is located between the first blocking member and the explosion-proof valve, and the pole and the corresponding pole ear are located between the first blocking member and the second blocking member.

13. The battery cell according to claim 12, characterized in that: The number of the poles is at least two, each of the poles is electrically connected to the corresponding pole lug, and the poles are arranged on opposite sides of the explosion-proof valve along the preset direction, and at least two of the second blocking members are located on both sides of the explosion-proof valve.

14. The battery cell according to any one of claims 1 to 10, characterized in that: The battery cell is in a square shape.

15. The battery cell according to any one of claims 1 to 10, characterized in that: The pole is connected to the target shell wall, the preset direction is the arrangement direction of the explosion-proof valve and the pole, and the side wall of the shell along the preset direction is spaced apart from the bare battery cell.

16. A battery pack, characterized in that: include: Box; The battery cell according to any one of claims 1 to 15, arranged inside the box.

17. An electrical device, characterized in that: include: Device body; The battery pack according to claim 16 is used to supply power to the device body.

18. An energy storage device, characterized in that: include: Install the container; The battery pack according to claim 16 is disposed in the mounting container.

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