Battery monomer assembly, battery device and power utilization device

Abstract

The utility model discloses a battery monomer assembly, a battery device and a power utilization device, and relates to the technical field of batteries. The electrode assembly is located in the shell, the conductive terminal and the pressure relief mechanism are installed on the shell, and the arrangement direction of the pressure relief mechanism and the electrode assembly is a first direction. Mounting plates are arranged on the two opposite sides of the battery unit in the first direction, each mounting plate is provided with an abutting face facing the corresponding battery monomer, the two ends of each battery monomer abut against the abutting faces in the first direction, the mounting plates are provided with receding holes corresponding to the pressure relief mechanisms, the receding holes penetrate through the mounting plates, and openings in one ends of the receding holes are located in the abutting faces. The protection part is connected with the mounting plate, the protection plate is located on one side, deviating from the corresponding single battery, of the abutting surface so as to be spaced from the corresponding pressure relief mechanism, the protection plate is projected in the first direction, and the projection area of the pressure relief mechanism is at least partially located in the projection area of the protection plate. According to the embodiment of the invention, the situation that the pressure relief mechanism is possibly damaged by the protection plate can be reduced.

Description

Technical Field

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

[0002] 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 and other fields. Batteries are usually equipped with a pressure relief mechanism to exhaust the battery in the event of thermal runaway. In order to reduce the premature opening of the pressure relief mechanism during transportation, a protective plate is provided to protect the pressure relief mechanism.

[0003] In the related art, the protective plate may cause damage to the pressure relief mechanism. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery cell assembly, a battery device and an electrical device to alleviate the situation where the protective plate causes damage to the pressure relief mechanism.

[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 assembly, comprising:

[0007] A battery unit, comprising one or at least two battery cells, wherein the battery cell comprises a housing, an electrode assembly located in the housing, and a conductive terminal and a pressure relief mechanism installed on the housing, wherein the conductive terminal is electrically connected to the electrode assembly, and the arrangement direction of the pressure relief mechanism and the electrode assembly is a first direction;

[0008] A mounting plate, wherein the mounting plates are disposed on opposite sides of the battery unit along the first direction, the mounting plates on each side have a contact surface facing the battery unit, and both ends of the battery unit respectively contact the corresponding contact surfaces along the first direction, and the mounting plate has a avoidance hole corresponding to the pressure relief mechanism, the avoidance hole passes through the mounting plate, and an opening of one end of the avoidance hole is located on the contact surface;

[0009] A protective member is located in the avoidance hole, the protective member is connected to the mounting plate, the protective member includes a guard plate, the guard plate is located on the side of the abutment surface away from the corresponding battery cell so as to be spaced apart from the corresponding pressure relief mechanism, and projected along the first direction, the projection area of ​​the pressure relief mechanism is at least partially located within the projection area of ​​the guard plate.

[0010] In the scheme of the embodiment of the present application, the battery cell assembly includes a protective member, and the protective member includes a protective plate. When projected along the first direction, the projection area of ​​the pressure relief mechanism is at least partially located within the projection area of ​​the protective plate, and the protective plate is spaced apart from the corresponding pressure relief mechanism. The protective plate can shield and protect the pressure relief mechanism, reduce the area of ​​the pressure relief mechanism exposed to the outside world, and thus reduce the impact of external shocks on the pressure relief mechanism. The protective plate is located on the side of the abutment surface away from the corresponding battery cell and is spaced apart from the corresponding pressure relief mechanism, which can reduce the direct contact between the protective plate and the pressure relief mechanism to a certain extent, thereby alleviating the damage to the pressure relief mechanism caused by burrs formed when the protective member is formed, and the pressure relief mechanism is more stable during operation.

[0011] In one embodiment, the distance between the guard plate and the corresponding abutting surface along the first direction is a first distance, and the first distance is greater than or equal to 0.2 mm.

[0012] In the solution of the embodiment of the present application, the larger distance between the guard plate and the corresponding abutment surface along the first direction can make the strength of the guard plate higher, and the service life of the guard plate longer, so that it can better protect the pressure relief mechanism.

[0013] In one embodiment, the thickness of the hole wall of the avoidance hole is a first thickness, and the first distance is less than or equal to the first thickness.

[0014] In the solution of the embodiment of the present application, the first distance is less than or equal to the first thickness. The greater thickness of the protective member enables the protective member to have a higher strength, thereby protecting the battery cell and reducing the impact of external impact on the battery cell.

[0015] In one embodiment, the mounting plate has a first surface on a side facing away from the abutting surface, the opening of the other end of the avoidance hole is located on the first surface, the surface of the protective member facing away from the side corresponding to the battery cell is a second surface, and the first surface is flush with the second surface.

[0016] In the solution of the embodiment of the present application, the first surface is flush with the second surface. The surfaces corresponding to the mounting plate and the protective member are relatively flat as a whole, which can reduce the processing difficulty of the mounting plate and the protective member to a certain extent and increase the manufacturing efficiency of the battery cell assembly.

[0017] In one embodiment, the pressure relief mechanism comprises:

[0018] A mechanism body, mounted on the housing;

[0019] A protective film is covered on the mechanism body, the protective film is located between the mechanism body and the guard plate, and the guard plate and the protective film are arranged at intervals.

[0020] In the solution of the embodiment of the present application, the pressure relief mechanism includes a mechanism body and a protective film. The protective film is located between the mechanism body and the protective plate, and the protective plate is arranged at an interval from the protective film. The protective film can relieve the entry of external dust and water vapor from the mechanism body into the battery cell, thereby affecting the normal operation of the battery cell. Moreover, the strength of the protective film is relatively low, and the arrangement of the protective plate at an interval from the protective film can reduce to a certain extent the situation where the protective plate pierces the protective film during operation, resulting in the failure of the protective film.

[0021] In one embodiment, a notch is formed on the mechanism body. The distance between the notch of the mechanism body and the protective plate is a second distance, and the distance between the maximum deformation position of the mechanism body in the closed state and the notch is a third distance. The second distance is greater than or equal to the third distance.

[0022] In the solution of the embodiment of the present application, the second distance is greater than or equal to the third distance. The maximum deformation amount of the mechanism body in the closed state is less than the distance between the notch and the protective plate. When the pressure inside the battery cell does not reach the rated opening pressure, the deformation of the mechanism body will not break through the protective plate. When the pressure inside the battery cell is greater than the rated opening pressure, the deformation amount of the mechanism body can be greater than the second distance, so that the pressure relief mechanism opens and breaks through the protective plate.

[0023] In one embodiment, the second distance is greater than or equal to 1.3 mm.

[0024] In the solution of the embodiment of the present application, the second distance being greater than or equal to 1.3 mm can reserve a certain space for the deformation of the mechanism body, thereby alleviating the situation where the protective plate is broken through by the battery cell during normal operation.

[0025] In one embodiment, the battery cell assembly further includes a current collector plate. The current collector plate is electrically connected to the conductive terminals of two battery cells respectively. The surface of the current collector plate facing away from the corresponding battery cell is a third surface, and the protective plate is located between the third surface and the abutting surface along the first direction.

[0026] In the solution of the embodiment of the present application, the protective plate is located between the third surface and the abutting surface along the first direction. When the battery cell undergoes thermal runaway, the protective plate can change the spraying direction of the electrolyte inside the battery cell to a certain extent, thereby alleviating the situation where the electrolyte sprays onto the current collector plate and reducing the possibility of short circuit of the battery cell assembly.

[0027] In one embodiment, the protective member is an injection molded part, and the protective member further includes connecting ribs. One end of each connecting rib is connected to the hole wall of the corresponding avoidance hole. The number of the connecting ribs is at least three, and at least three of the connecting ribs are arranged at intervals. One side of the guard plate facing the hole wall of the avoidance hole has a fourth surface and a fifth surface that are connected end to end. The fourth surface is arc-shaped, and the fifth surface is a plane. The other end of the connecting rib is connected to the corresponding fourth surface. Two of the connecting ribs are arranged opposite to each other at both ends along the extending direction of the fifth surface. Both ends of the connecting ribs have a sixth surface flush with the fifth surface. The connecting ribs, the guard plate, and the mounting plate are integrally formed. The connecting ribs are configured to break under the impact of thermal runaway gas on the guard plate.

[0028] In the solution of the embodiment of the present application, the protective member is an injection molded part, and the protective member further includes connecting ribs. One end of each connecting rib is connected to the hole wall of the corresponding avoidance hole. The connecting ribs are configured to break under the impact of thermal runaway gas on the guard plate. During the injection molding process, the injection fluid flows into the cavity corresponding to the guard plate, and the gas in the cavity corresponding to the guard plate can flow out from the cavity corresponding to the connecting ribs. Two of the connecting ribs are arranged opposite to each other at both ends along the extending direction of the fifth surface. It is difficult for bubbles to appear in the area of the cavity corresponding to the guard plate, and the injection liquid can be better filled in the cavity corresponding to the guard plate, thereby reducing the occurrence of bubbles in the guard plate during the molding process.

[0029] In one embodiment, the protective member is an injection molded part, and the protective member further includes connecting ribs. One end of each connecting rib is connected to the hole wall of the corresponding avoidance hole. The number of the connecting ribs is at least three, and at least three of the connecting ribs are arranged at intervals; the connecting ribs, the guard plate, and the mounting plate are integrally formed. The connecting ribs are configured to break under the impact of thermal runaway gas on the guard plate. The width of the connecting rib is greater than or equal to the difference between the thickness of the guard plate and 0.5 mm, and the width of the connecting rib is less than or equal to the sum of the thickness of the guard plate and 1 mm.

[0030] In the solution of the embodiment of the present application, the protective member is an injection molded part, and the protective member further includes connecting ribs. The width of the connecting rib is greater than or equal to the difference between the thickness of the guard plate and 0.5 mm, and the width of the connecting rib is less than or equal to the sum of the thickness of the guard plate and 1 mm. When the width of the connecting rib is within a suitable range, it can ensure that the injection fluid can flow smoothly in the cavity corresponding to the connecting rib, and during the working process, the connecting rib can break better under the impact of thermal runaway gas.

[0031] In the second aspect of the embodiment of the present application, a battery device is provided, including:

[0032] A box body;

[0033] The battery cell assembly described in any one of the above, located inside the box body.

[0034] A third aspect of an embodiment of the present application provides an electrical device, including:

[0035] Device body;

[0036] Any of the above-mentioned battery devices is used to supply power to the device body.

[0037] Utility Model Effect

[0038] The battery cell assembly of the embodiment of the present application includes a protective member, and the protective member includes a protective plate. When projected along the first direction, the projection area of ​​the pressure relief mechanism is at least partially located within the projection area of ​​the protective plate, and the protective plate is spaced apart from the corresponding pressure relief mechanism. The protective plate can shield and protect the pressure relief mechanism, reduce the area of ​​the pressure relief mechanism exposed to the outside world, and thus reduce the impact of external shocks on the pressure relief mechanism. The protective plate is located on the side of the abutment surface away from the corresponding battery cell and is spaced apart from the corresponding pressure relief mechanism, which can reduce the direct contact between the protective plate and the pressure relief mechanism to a certain extent, thereby alleviating the damage to the pressure relief mechanism caused by burrs formed when the protective member is formed, and the pressure relief mechanism is more stable during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 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:

[0040] Figure 1 A simplified structural diagram of a battery cell assembly according to an embodiment of the present application;

[0041] Figure 2 It is a schematic diagram of the assembly of the battery unit and the mounting plate of an embodiment of the present application;

[0042] Figure 3 for Figure 2 A partial enlarged view of the middle position A;

[0043] Figure 4 A simplified structural diagram of a mounting plate according to an embodiment of the present application;

[0044] Figure 5 for Figure 4 A partial enlarged view of the middle position B;

[0045] Figure 6 This is a schematic diagram of the assembly of the protective member and the mounting plate of an embodiment of the present application;

[0046] Figure 7 for Figure 6 A partial enlarged view of the middle position C;

[0047] Figure 8 This is a schematic diagram of the assembly of the guard plate and the connecting rib in the embodiment of the present application.

[0048] Explanation of the reference numerals in the drawings

[0049] 1. Battery unit; 10. Battery cell; 100. Outer shell; 101. Conductive terminal; 102. Pressure relief mechanism; 1020. Mechanism body; 1020a. Score; 1021. Protective film; 2. Mounting plate; 2a. Contact surface; 2b. Avoidance hole; 2c. First surface; 3. Protective member; 3a. Second surface; 30. Guard plate; 30a. Fourth surface; 30b. Fifth surface; 31. Connecting rib; 31a. Sixth surface; 4. Current collector plate; 4a. Third surface. Detailed implementation manners

[0050] Next, embodiments of the technical solutions of the present application will be described in detail with reference to the drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of the present application, technical terms such as "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 quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0053] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In the related art, during the transportation or operation of the battery cell assembly, the pressure relief mechanism may be impacted by the outside world and open the valve prematurely. It is necessary to set a protective plate inside the battery cell assembly to protect the pressure relief mechanism. Usually, the protective plate and the pressure relief mechanism abut against each other. The protective plate may have burrs or protrusions due to the low manufacturing precision, which may cause wear and tear on the pressure relief mechanism, and even damage the pressure relief mechanism.

[0058] In the embodiment of the present application, the protective plate 30 is arranged on the side of the abutting surface 2a away from the corresponding battery cell 10 so as to be spaced apart from the corresponding pressure relief mechanism 102 to alleviate the direct contact between the protective plate 30 and the pressure relief mechanism 102, thereby reducing the possibility that the protective plate 30 may cause damage to the pressure relief mechanism 102.

[0059] The emissions from the battery cells 10 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the isolation membrane, high-temperature and high-pressure gas generated by the reaction, flames, and the like.

[0060] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell 10 assemblies for providing voltage and capacity. The battery cell 10 assembly may include multiple battery cells 10, and the multiple battery cells 10 are connected in series, in parallel or in mixed connection through a busbar component.

[0061] In some embodiments, a Battery Cell Assembly generally consists of multiple battery cells 10 arranged; as an example, the Battery Cell Assembly can be a Battery Module, which is formed by arranging and fixing multiple battery cells 10 into an independent module. As an example, the Battery Module can be formed by bundling multiple battery cells 10 with cable ties.

[0062] In some embodiments, the battery device can be a battery Pack, which includes a box body and one or more Battery Cell Assemblies, and the Battery Cell Assemblies are accommodated in the box body.

[0063] As an example, the Battery Cell Assembly can be a Battery Module, and the Battery Cell Assembly can be accommodated in the box body by fixing the Battery Module in the box body.

[0064] As an example, the Battery Cell Assembly can also be accommodated in the box body by directly fixing multiple battery cells 10 to the box body.

[0065] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the Battery Cell Assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0066] As an example, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the Battery Cell Assembly.

[0067] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beam and longitudinal beam of the vehicle.

[0068] In some embodiments, the battery device refers to an energy storage device, which includes a box body, and at least one side of the box body is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0069] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells 10 and battery devices, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0070] An embodiment of the present application further provides an electrical device, which includes a device body and a battery device, and the battery device is used to supply power to the device body.

[0071] The battery cell 10 assembly of the embodiment of the present application is shown in FIG. Figures 1 to 8 The battery cell 10 assembly includes a battery unit 1, a mounting plate 2 and a protective member 3. The battery unit 10 includes one or at least two battery units 10, and the battery unit 10 includes a housing 100, an electrode assembly located in the housing 100, and a conductive terminal 101 and a pressure relief mechanism 102 installed on the housing 100. The conductive terminal 101 is electrically connected to the electrode assembly, and the arrangement direction of the pressure relief mechanism 102 and the electrode assembly is a first direction. The battery unit 1 is provided with mounting plates 2 on both opposite sides along the first direction, and each mounting plate 2 has an abutment surface 2a facing the battery unit 10. Both ends of the battery unit 10 abut against the corresponding abutment surface 2a along the first direction, and the mounting plate 2 has an avoidance hole 2b corresponding to the pressure relief mechanism 102. The avoidance hole 2b passes through the mounting plate 2, and the opening of one end of the avoidance hole 2b is located on the abutment surface 2a. The protective member 3 is located in the avoidance hole 2b, and the protective member 3 is connected to the mounting plate 2. The protective member 3 includes a guard plate 30. The guard plate 30 is located on the side of the abutting surface 2a away from the corresponding battery cell 10 so as to be spaced apart from the corresponding pressure relief mechanism 102. When projected along the first direction, the projection area of ​​the pressure relief mechanism 102 is at least partially located within the projection area of ​​the guard plate 30.

[0072] The housing 100 refers to a structure for supporting the electrode assembly and the pressure relief mechanism 102 .

[0073] In some embodiments, the housing 100 may be a sealed structure or a non-sealed structure. As an example, when the housing 100 is a non-sealed structure, the housing 100 plays a role in protecting the electrode assembly, and a sealed bag is further included between the housing 100 and the electrode assembly, and the sealed bag is used to package the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bagged insulating member or an aluminum-plastic film.

[0074] The conductive terminal 101 refers to a structure of the electrode assembly used to electrically connect to an external structure.

[0075] By way of example, the conductive terminal 101 may be a pole.

[0076] The pressure relief mechanism 102 is a structure that opens when thermal runaway occurs inside the battery cell 10 to discharge the gas inside the housing 100 .

[0077] Exemplarily, the pressure relief mechanism 102 is an explosion-proof valve.

[0078] The mounting plate 2 is a structure for relatively fixing the plurality of battery cells 10 .

[0079] The protective member 3 refers to a structure for shielding the pressure relief mechanism 102 of the battery cell 10.

[0080] It can be understood that the present application does not limit the number of pressure relief mechanisms 102. Exemplarily, pressure relief mechanisms 102 are formed at both opposite ends of the battery cell 10 along the first direction, or a pressure relief mechanism 102 is formed at one of the two opposite ends of the battery cell 10 along the first direction. When pressure relief mechanisms 102 are formed at both opposite ends of the battery cell 10 along the first direction, protective members 3 are correspondingly provided for both pressure relief mechanisms 102.

[0081] It can be understood that the guard plate 30 is located on the side of the abutting surface 2a away from the corresponding battery cell 10 and is arranged at an interval from the corresponding pressure relief mechanism 102. A stepped surface is formed between the guard plate 30 and the abutting surface 2a, and stress concentration is likely to occur at the corner of the stepped surface. When a thermal runaway occurs inside the battery cell 10, the thermal runaway gas can easily push open the guard plate 30.

[0082] Exemplarily, the first direction is the direction shown by the arrow R1 in the figure.

[0083] In the solution of the embodiment of the present application, the battery cell 10 assembly includes a protective member 3. The protective member 3 includes a guard plate 30. When projected along the first direction, at least part of the projection area of the pressure relief mechanism 102 is located within the projection area of the guard plate 30, and the guard plate 30 is arranged at an interval from the corresponding pressure relief mechanism 102. The guard plate 30 can shield and protect the pressure relief mechanism 102, reduce the area of the pressure relief mechanism 102 exposed to the outside, and thus reduce the influence of external impacts on the pressure relief mechanism 102. The guard plate 30 is located on the side of the abutting surface 2a away from the corresponding battery cell 10 and is arranged at an interval from the corresponding pressure relief mechanism 102, which can reduce the direct contact between the guard plate 30 and the pressure relief mechanism 102 to a certain extent, thereby alleviating the damage to the pressure relief mechanism 102 caused by the burrs formed during the molding of the protective member 3, and making the pressure relief mechanism 102 more stable during the working process.

[0084] In one embodiment, please refer to Figure 4 and Figure 5 , the distance between the guard plate 30 and the corresponding abutting surface 2a along the first direction is a first distance, and the first distance is greater than or equal to 0.2 mm.

[0085] Exemplarily, the magnitude of the first distance is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1.0 mm.

[0086] It can be understood that the first distance can be measured by a vernier caliper in an environment of normal temperature and pressure.

[0087] Exemplarily, the first distance is Figure 5The distance shown by dimension D1.

[0088] In the solution of the embodiment of the present application, the larger distance between the guard plate 30 and the corresponding abutment surface 2a along the first direction can make the strength of the guard plate 30 higher, and the service life of the guard plate 30 is longer, so that the pressure relief mechanism 102 can be better protected. Furthermore, the guard plate 30 will form burrs during the manufacturing process due to factors such as processing accuracy, and it is not necessary for the product itself to form burrs. The first distance is greater than or equal to 0.2, which can be greater than the length of most burrs, thereby further reducing the damage of the burrs to the pressure relief mechanism 102.

[0089] It is understandable that the embodiments of the present application do not limit the size of the first distance.

[0090] In one embodiment, please refer to Figure 5 The thickness of the hole wall of the avoidance hole 2b is the first thickness, and the first distance is less than or equal to the first thickness.

[0091] Exemplarily, the first distance is the first thickness or

[0092] For example, the first thickness is Figure 5 Medium size D2 shown.

[0093] In the solution of the embodiment of the present application, the first distance is less than or equal to the first thickness. The greater thickness of the protective member 3 enables the protective member 3 to have a higher strength, thereby protecting the battery cell 1 and reducing the impact of external impact on the battery cell 1 .

[0094] It is understandable that the embodiments of the present application do not limit the ratio between the first distance and the first thickness, and the first distance only needs to be smaller than the first thickness.

[0095] In one embodiment, please refer to Figure 5 The mounting plate 2 has a first surface 2c on the side away from the abutting surface 2a, the opening of the other end of the avoidance hole 2b is located on the first surface 2c, the surface of the protective member 3 on the side away from the corresponding battery cell 10 is a second surface 3a, and the first surface 2c is flush with the second surface 3a.

[0096] In the embodiment of the present application, the first surface 2c is flush with the second surface 3a. The surfaces corresponding to the mounting plate 2 and the protective member 3 are relatively flat as a whole, which can reduce the processing difficulty of the mounting plate 2 and the protective member 3 to a certain extent and increase the manufacturing efficiency of the battery cell 10 assembly.

[0097] It can be understood that the embodiments of the present application do not limit the first surface 2c and the second surface 3a to be flush. Exemplarily, along the first direction, the second surface 3a is located between the first surface 2c and the corresponding abutting surface 2a.

[0098] In one embodiment, please refer to Figure 3 , the pressure relief mechanism 102 includes a mechanism body 1020 and a protective film 1021. The mechanism body 1020 is installed on the housing 100. The protective film 1021 covers the mechanism body 1020. The protective film 1021 is located between the mechanism body 1020 and the protection plate 30, and the protection plate 30 is arranged at an interval from the protective film 1021.

[0099] The protective film 1021 refers to a structure for blocking foreign matters from entering the battery cell 10 through the mechanism body 1020.

[0100] In the solution of the embodiment of the present application, the pressure relief mechanism 102 includes a mechanism body 1020 and a protective film 1021. The protective film 1021 is located between the mechanism body 1020 and the protection plate 30, and the protection plate 30 is arranged at an interval from the protective film 1021. The protective film 1021 can prevent external dust and water vapor from entering the battery cell 10 through the mechanism body 1020, thereby affecting the normal operation of the battery cell 10. Moreover, the strength of the protective film 1021 is relatively low, and the arrangement of the protection plate 30 at an interval from the protective film 1021 can reduce the situation that the protection plate 30 pierces the protective film 1021 during operation, resulting in the failure of the protective film 1021 to a certain extent.

[0101] It can be understood that the embodiments of the present application do not limit whether the pressure relief mechanism 102 is provided with the protective film 1021.

[0102] In one embodiment, please refer to Figure 3 , a notch 1020a is formed on the mechanism body 1020. The distance between the notch 1020a of the mechanism body 1020 and the protection plate 30 is a second distance, and the distance between the maximum deformation position of the mechanism body 1020 in the closed state and the notch 1020a is a third distance. The second distance is greater than or equal to the third distance.

[0103] In the solution of the embodiment of the present application, the second distance is greater than or equal to the third distance. The maximum deformation amount of the mechanism body 1020 in the closed state is less than the distance between the notch 1020a and the protection plate 30. When the pressure inside the battery cell 10 does not reach the rated opening pressure, the deformation of the mechanism body 1020 will not break through the protection plate 30. When the pressure inside the battery cell 10 is greater than the rated opening pressure, the deformation amount of the mechanism body 1020 can be greater than the second distance, so that the pressure relief mechanism 102 opens and breaks through the protection plate 30.

[0104] It is understandable that the embodiments of the present application do not limit the relationship between the second distance and the third distance.

[0105] In one embodiment, the second distance is greater than or equal to 1.3 mm.

[0106] Exemplarily, the magnitude of the second distance is equal to 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2.0 mm.

[0107] Exemplarily, the second distance is as Figure 3 shown by dimension D3 in

[0108] It is understandable that the second distance can be measured by a vernier caliper in an environment of normal temperature and pressure.

[0109] In the solution of the embodiments of the present application, the second distance being greater than or equal to 1.3 mm can reserve a certain space for the deformation of the mechanism body 1020, thereby alleviating the situation that the battery cell 10 pushes open the protection plate 30 under normal working conditions.

[0110] In one embodiment, please refer to Figure 2 and Figure 3 , the battery cell 10 assembly further includes a current collector plate 4, the current collector plate 4 is electrically connected to the conductive terminals 101 of two battery cells 10 respectively, the surface of the current collector plate 4 facing away from the corresponding battery cell 10 is the third surface 4a, and the protection plate 30 is located between the third surface 4a and the abutting surface 2a along the first direction.

[0111] The current collector plate 4 refers to a conductive component for connecting the battery cells 10. Its main function is to connect the battery cells 10 in series or parallel forms during the manufacturing process of the energy storage battery to meet the voltage and capacity requirements of different battery cell 10 assemblies.

[0112] In the solution of the embodiments of the present application, the protection plate 30 is located between the third surface 4a and the abutting surface 2a along the first direction. When the battery cell 10 undergoes thermal runaway, the protection plate 30 can change the spraying direction of the electrolyte inside the battery cell 10 to a certain extent, thereby alleviating the situation that the electrolyte sprays onto the current collector plate 4 and reducing the possibility of short circuit of the battery cell 10 assembly.

[0113] It is understandable that the embodiments of the present application do not limit the protection plate 30 to be located between the third surface 4a and the abutting surface 2a along the first direction. Exemplarily, along the first direction, the protection plate 30 is located on the side of the third surface 4a away from the abutting surface 2a.

[0114] In one embodiment, please refer to Figures 6 to 8, the protective member 3 is an injection-molded part. The protective member 3 further includes connecting ribs 31. One end of each connecting rib 31 is connected to the hole wall of the corresponding avoidance hole 2b. The number of the connecting ribs 31 is at least three, and the at least three connecting ribs 31 are arranged at intervals. One side of the guard plate 30 facing the hole wall of the avoidance hole 2b has a fourth surface 30a and a fifth surface 30b that are connected end to end. The fourth surface 30a is arc-shaped, and the fifth surface 30b is a plane. The other end of the connecting rib 31 is connected to the corresponding fourth surface 30a. Two of the connecting ribs 31 are arranged opposite to each other at both ends along the extending direction of the fifth surface 30b. The two end connecting ribs 31 have a sixth surface 31a flush with the fifth surface 30b. The connecting ribs 31, the guard plate 30, and the mounting plate 2 are integrally formed. The connecting ribs 31 are configured to break under the impact of the thermal runaway gas on the guard plate 30.

[0115] An injection-molded part refers to an injection-molded product produced by an injection molding machine using the injection molding process.

[0116] Exemplarily, when projected along the first direction, the shape of the projected area of the guard plate 30 is semi-circular or semi-elliptical.

[0117] In the solution of the embodiment of the present application, the protective member 3 is an injection-molded part. The protective member 3 further includes connecting ribs 31. One end of each connecting rib 31 is connected to the hole wall of the corresponding avoidance hole 2b. The connecting ribs 31 are configured to break under the impact of the thermal runaway gas on the guard plate 30. During the injection molding process, the injection fluid flows into the cavity corresponding to the guard plate 30, and the gas in the cavity corresponding to the guard plate 30 can flow out from the cavity corresponding to the connecting rib 31. Two of the connecting ribs 31 are arranged opposite to each other at both ends along the extending direction of the fifth surface 30b. In the cavity corresponding to the guard plate 30, it is difficult to have areas where air bubbles are difficult to discharge. The injection liquid can better fill the cavity corresponding to the guard plate 30, thereby reducing the occurrence of air bubbles in the guard plate 30 during the molding process.

[0118] It can be understood that the present application does not limit the number of the connecting ribs 31 and the positions of the connecting ribs 31 relative to the fourth surface 30a and the fifth surface 30b. Exemplarily, all the connecting ribs 31 are arranged at intervals along the circumferential direction of the fourth surface 30a.

[0119] It can be understood that when the protective member 3 includes the connecting ribs 31, the connecting members are respectively connected to the guard plate 30 and the mounting plate 2. When the protective member 3 only includes the guard plate 30, the guard plate 30 is connected to the mounting plate 2.

[0120] In one embodiment, please refer to Figures 6 to 8, the protective member 3 is an injection molded part. The protective member 3 further includes connecting ribs 31. One end of each connecting rib 31 is connected to the hole wall of the corresponding avoidance hole 2b. The number of the connecting ribs 31 is at least three, and at least three connecting ribs 31 are arranged at intervals; the connecting ribs 31, the guard plate 30 and the mounting plate 2 are integrally formed. The connecting ribs 31 are configured to break under the impact of the thermal runaway gas on the guard plate 30. The width of the connecting rib 31 is greater than or equal to the difference between the thickness of the guard plate 30 and 0.5 mm, and the width of the connecting rib 31 is less than or equal to the sum of the thickness of the guard plate 30 and 1 mm.

[0121] Exemplarily, the width of the connecting rib 31 is h1, and the thickness of the guard plate 30 is h2. The value of h1 is h2 - 0.5, h2 - 0.4, h2 - 0.3, h2, h2 + 0.2, h2 + 0.4, h2 + 0.6, h2 + 0.8 or h2 + 1.0.

[0122] Exemplarily, the thickness of the connecting rib 31 is greater than or equal to the thickness of the guard plate 30.

[0123] Exemplarily, the thickness of the connecting rib 31 is less than or equal to the thickness of the hole wall of the avoidance hole 2b.

[0124] Exemplarily, the material of the connecting rib 31 is polycarbonate, a mixture of acrylonitrile - styrene - butadiene copolymer and polycarbonate, nylon 6 material, or a mixture of glass fiber reinforced material and nylon 6.

[0125] In the solution of the embodiment of the present application, the protective member 3 is an injection molded part. The protective member 3 further includes connecting ribs 31. The width of the connecting rib 31 is greater than or equal to the difference between the thickness of the guard plate 30 and 0.5 mm, and the width of the connecting rib 31 is less than or equal to the sum of the thickness of the guard plate 30 and 1 mm. When the width of the connecting rib 31 is within a suitable range, it can ensure that the injection molding fluid can flow smoothly in the cavity corresponding to the connecting rib 31, and during the working process, the connecting rib 31 can break well under the impact of the thermal runaway gas.

[0126] It can be understood that the embodiment of the present application does not limit the relationship between the width of the connecting rib 31 and the thickness of the guard plate 30.

[0127] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell component, characterized in that, include: A battery unit, comprising one or at least two battery cells, wherein the battery cell comprises a housing, an electrode assembly located in the housing, and a conductive terminal and a pressure relief mechanism installed on the housing, wherein the conductive terminal is electrically connected to the electrode assembly, and the arrangement direction of the pressure relief mechanism and the electrode assembly is a first direction; A mounting plate, wherein the mounting plates are disposed on opposite sides of the battery unit along the first direction, the mounting plates on each side have a contact surface facing the battery unit, and both ends of the battery unit respectively contact the corresponding contact surfaces along the first direction, and the mounting plate has a avoidance hole corresponding to the pressure relief mechanism, the avoidance hole passes through the mounting plate, and an opening of one end of the avoidance hole is located on the contact surface; A protective member is located in the avoidance hole, the protective member is connected to the mounting plate, the protective member includes a guard plate, the guard plate is located on the side of the abutment surface away from the corresponding battery cell so as to be spaced apart from the corresponding pressure relief mechanism, and projected along the first direction, the projection area of ​​the pressure relief mechanism is at least partially located within the projection area of ​​the guard plate.

2. The battery cell assembly according to claim 1, wherein, The distance between the guard plate and the corresponding abutment surface along the first direction is a first distance, and the first distance is greater than or equal to 0.2 mm.

3. The battery cell assembly according to claim 2, wherein, The thickness of the hole wall of the avoidance hole is a first thickness, and the first distance is less than or equal to 1 / 3 of the first thickness.

4. The battery cell assembly according to claim 3, characterized in that, The mounting plate has a first surface on a side away from the abutting surface, the opening of the other end of the avoidance hole is located on the first surface, the surface of the protective member away from the side corresponding to the battery cell is a second surface, and the first surface is flush with the second surface.

5. The battery cell assembly according to any one of claims 1 to 4, characterized in that The pressure relief mechanism comprises: A mechanism body, mounted on the housing; A protective film is covered on the mechanism body, the protective film is located between the mechanism body and the guard plate, and the guard plate and the protective film are arranged at intervals.

6. The battery cell assembly according to claim 5, characterized in that, A notch is formed on the mechanism body, the distance between the notch of the mechanism body and the guard plate is the second distance, the distance between the maximum deformation position of the mechanism body in a closed state and the notch is the third distance, and the second distance is greater than or equal to the third distance.

7. The battery cell assembly according to claim 6, characterized in that, The second distance is greater than or equal to 1.3 mm.

8. The battery cell assembly according to claim 6, wherein The battery cell assembly also includes a current collecting plate, which is electrically connected to the conductive terminals of the two battery cells respectively. The surface of the current collecting plate facing away from the corresponding battery cell is a third surface, and the protective plate is located between the third surface and the abutting surface along the first direction.

9. The battery cell assembly according to any one of claims 1 to 4, characterized in that The protective member is an injection molded part. The protective member further includes connecting ribs. One end of each connecting rib is connected to the hole wall corresponding to the avoidance hole. The number of the connecting ribs is at least three, and at least three of the connecting ribs are arranged at intervals. One side of the guard plate facing the hole wall of the avoidance hole has a fourth surface and a fifth surface that are connected end to end. The fourth surface is arc-shaped, and the fifth surface is a plane. The other end of the connecting rib is connected to the corresponding fourth surface. Two of the connecting ribs are arranged opposite to each other at both ends along the extending direction of the fifth surface. The two ends of the connecting ribs have a sixth surface flush with the fifth surface. The connecting ribs, the guard plate, and the mounting plate are integrally formed. The connecting ribs are configured to break under the impact of the thermal runaway gas on the guard plate.

10. The battery cell assembly according to any one of claims 1 to 4, characterized in that, The protective member is an injection molded part. The protective member further includes connecting ribs. One end of each connecting rib is connected to the hole wall corresponding to the avoidance hole. The number of the connecting ribs is at least three, and at least three of the connecting ribs are arranged at intervals; the connecting ribs, the guard plate, and the mounting plate are integrally formed. The connecting ribs are configured to break under the impact of the thermal runaway gas on the guard plate. The width of the connecting rib is greater than or equal to the difference between the thickness of the guard plate and 0.5 mm, and the width of the connecting rib is less than or equal to the sum of the thickness of the guard plate and 1 mm.

11. A battery device, characterized in that, Comprising: A box body; The battery cell assembly according to any one of claims 1 to 10, located inside the box body.

12. An electrical device, characterized in that, Comprising: A device main body; The battery device according to claim 11, configured to supply power to the device main body.

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