Battery pack and electric device

Abstract

The utility model provides a battery pack and an electric device. The battery pack comprises a box body structure, a battery module, a structural adhesive and a buffer piece, the box body structure comprises a containing cavity composed of a first bottom plate and a first side plate. And the battery module is placed in the accommodating cavity. The battery module comprises a plurality of single batteries, and each single battery comprises a battery cell shell and a battery cell. The battery cell shell comprises a second bottom plate and a second side plate, and the second bottom plate is perpendicular to the second side plate. The structural adhesive is arranged on the first bottom plate and used for bonding the second bottom plate to the first bottom plate. The buffer part is simultaneously adhered to the second bottom plate, the second side plate and the prismatic surface between the second bottom plate and the second side plate, so that one part of the structural adhesive is adhered to the second bottom plate, and the other part of the structural adhesive is adhered to the buffer part, so that the second side plate and the prismatic surface are not in direct contact with the structural adhesive; therefore, the risk of liquid leakage caused by breakage of the battery cell shell and exposure of the battery cell is reduced, the service life of the battery is prolonged, and normal use of an electric device is ensured.

Description

Technical Field

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

[0002] The battery pack in an electric heavy-duty truck or electric bus may include a housing structure and battery modules. The housing houses the battery modules. Each battery module includes multiple battery cells, each of which may include a battery cell and a cell housing. The cell housing encloses and protects the cell, preventing it from being exposed.

[0003] When electric heavy trucks or electric buses are in harsh road conditions such as mines, the battery pack will vibrate for a long time, causing stress concentration at the fixing points of the battery cell shell, thereby causing the battery cell shell to rupture and expose the battery cell, resulting in the risk of leakage, affecting the battery life and the normal use of electrical devices. Utility Model Content

[0004] The present application provides a battery pack and an electrical device to avoid stress concentration problems in the cell shell caused by long-term vibration of the battery pack, thereby extending the life of the battery and ensuring the normal use of the electrical device.

[0005] In the first aspect, the present application provides a battery pack, comprising a box structure, a battery module, structural adhesive and a buffer. The box structure comprises a first bottom plate and a first side plate, and the first bottom plate and a plurality of first side plates constitute a receiving cavity. The battery module is placed in the receiving cavity. The battery module may comprise a plurality of battery cells, each battery cell comprising a cell shell and a cell, the cell shell being used to wrap and protect the cell so that the cell is not exposed. The cell shell comprises a second bottom plate and a second side plate, the second bottom plate and the second side plate being perpendicular to each other. The structural adhesive is provided on the first bottom plate for bonding the second bottom plate to the first bottom plate. The buffer is bonded to the second bottom plate, the second side plate and the edge surface between the second bottom plate and the second side plate at the same time, so that a portion of the structural adhesive is bonded to the second bottom plate and another portion of the structural adhesive is bonded to the buffer.

[0006] The battery provided by the first aspect includes a box structure, a battery module, structural adhesive and a buffer. Structural adhesive is provided on the first bottom plate of the box structure, which is used to bond the second bottom plate to the first bottom plate, thereby ensuring the structural strength of the battery pack under long-term vibration. The battery module includes a plurality of battery cells, and the battery cell shell of the battery cell includes a second bottom plate and a second side plate. The buffer is bonded to the second bottom plate, the second side plate and the edge surface between the second bottom plate and the second side plate at the same time, so that part of the structural adhesive is bonded to the second bottom plate and the other part of the structural adhesive is bonded to the buffer, so that the second side plate and the edge surface are not directly in contact with the structural adhesive, thereby reducing the risk of rupture of the battery cell shell and leakage caused by exposure of the battery cell, extending the life of the battery and ensuring the normal use of the electrical device.

[0007] In a possible design, the buffer is a tape, and the adhesive force of the tape is smaller than the adhesive force of the structural adhesive.

[0008] Based on the description of the above embodiment, the buffer component is set to a tape with an adhesive force smaller than that of the structural adhesive, so that the second side surface and the edge surface will not produce stress concentration problems due to excessive adhesive force, thereby reducing the risk of battery cell shell rupture and battery cell exposure causing leakage, extending the battery life, and ensuring the normal use of electrical devices.

[0009] In a possible design, the adhesive force of the tape is less than 1 MPa.

[0010] Based on the description of the above embodiment, when the bonding force is less than 1 MPa, the second side surface and the edge surface will not produce stress concentration problems due to excessive bonding force, thereby reducing the risk of battery cell shell rupture and battery cell exposure causing leakage, extending the battery life, and ensuring the normal use of electrical devices.

[0011] In one possible design, the adhesive tape includes a first section and a second section that are bent and formed. The first section and the second section are perpendicular to each other. The first section is bonded to the second side panel, and the second section is bonded to the second bottom panel.

[0012] Based on the description of the above embodiment, the adhesive tape includes a first section and a second section that are bent and formed. The first section is bonded to the second side panel, and the second section is bonded to the second bottom panel. This prevents the structural adhesive from adhering to the battery cell housing through the gaps between the adhesive tapes. This prevents stress concentration on the second side surface and edges due to excessive adhesive force, thereby reducing the risk of battery cell housing rupture and battery cell exposure leading to leakage, extending the battery life, and ensuring the normal use of the electrical device.

[0013] In one possible design, the dimension of the adhesive tape in a first direction is greater than or equal to 70 mm, wherein the first direction is the length direction of the battery pack.

[0014] Based on the description of the above embodiment, the dimensions of the first segment and the second segment in the first direction are both greater than or equal to 70 mm, so that the length of the edge surface covered by the tape can be greater than or equal to 70 mm, so that the bottom fillets in the two adjacent battery cell shells are covered by the tape, so that the bottom fillets in the battery cell shell will not cause stress concentration due to excessive adhesion force, thereby reducing the risk of battery cell shell rupture and battery cell exposure causing leakage, extending the life of the battery, and ensuring the normal use of electrical devices.

[0015] In a possible design, the height of the structural adhesive overflowing along the second side plate is greater than or equal to 10 mm, and the height of the structural adhesive overflowing along the second side plate is less than or equal to 15 mm.

[0016] Based on the description of the above embodiment, the height of the structural adhesive overflow along the second side panel is greater than or equal to 10 mm, and the height of the structural adhesive overflow along the second side panel is less than or equal to 15 mm. While ensuring the connection strength between the battery shell and the box body, it does not affect the layout and installation of other components in the box structure.

[0017] In one possible design, the dimension of the first section in the second direction is greater than or equal to 20 mm, and the dimension of the first section in the second direction is less than or equal to 30 mm, wherein the second direction is the height direction of the battery pack.

[0018] Based on the description of the above embodiment, when the dimension of the first segment in the second direction is greater than or equal to 20 mm, and the dimension of the first segment in the second direction is less than or equal to 30 mm, the structural adhesive will not directly contact the second side panel, thereby avoiding the problem of stress concentration on the second side panel, thereby reducing the risk of rupture of the battery cell shell and leakage of the battery cell due to exposure, extending the battery life, and ensuring the normal use of electrical devices.

[0019] In one possible design, the dimension of the second section in the third direction is greater than or equal to 10 mm, and the dimension of the second section in the third direction is less than or equal to 15 mm, where the third direction is the width direction of the battery pack.

[0020] Based on the description of the above embodiment, when the size of the second segment in the third direction is greater than or equal to 10 mm, and the size of the second segment in the third direction is less than or equal to 15 mm, it can not only ensure the connection strength between the battery cell shell and the box structure, but also avoid the problem of stress concentration near the edge surface of the second bottom plate, thereby reducing the risk of battery cell shell rupture and battery cell exposure and leakage, extending the battery life, and ensuring the normal use of electrical devices.

[0021] In a second aspect, the present application provides an electrical device comprising the battery pack described in any one of the above embodiments.

[0022] The beneficial effects of the electrical device provided in the second aspect can be referred to the beneficial effects brought about by the first aspect and the various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 This is an exploded view of the battery pack in an embodiment of the present application.

[0025] Figure 2 This is a partial view of the battery module in an embodiment of the present application.

[0026] Figure 3 for Figure 1 Magnified view of section A.

[0027] Figure 4 This is an exploded view of the battery module, structural adhesive and buffer component in the embodiment of the present application.

[0028] Figure 5 This is a structural diagram of a battery module in an embodiment of the present application.

[0029] Figure 6 for Figure 5 Magnified view of part B.

[0030] Description of reference numerals:

[0031] 100-battery pack;

[0032] 1-box structure; 11-first bottom plate; 12-first side plate;

[0033] 2-battery module; 21-cell housing; 211-second bottom plate; 212-second side plate; 213-bottom fillet;

[0034] 3-Structural adhesive;

[0035] 4-buffer; 41-first section; 42-second section;

[0036] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] The terms "comprises", "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover but not exclude other contents. The word "a" or "an" does not exclude the presence of a plurality.

[0040] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0042] The directional words appearing in the following description are all directions shown in the drawings and do not limit the specific structure of this application. For example, in the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting this application.

[0043] In addition, the expressions indicating directions such as the X direction, Y direction, and Z direction used to illustrate the operation and construction of the various components of this embodiment are not absolute but relative, and although these indications are appropriate when the various components are in the positions shown in the figures, when these positions are changed, these directions should be interpreted differently to correspond to the changes.

[0044] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0045] In the description of this application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two (including two).

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, "connected" or "connected" in a mechanical structure can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection via a fixing member, such as a screw, bolt, or other fixing member. A physical connection can also be a detachable connection, such as a mutual snap-fit ​​connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. "Connected" or "connected" in a circuit structure can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as the circuit is interconnected. It can also refer to internal communication between two elements. A signal connection can refer to a signal connection through a circuit or a signal connection through a media medium, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application.

[0047] An electrical device refers to an electrical device that uses electricity to perform specific functions. These devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, and so on. Electric vehicles include electric commercial vehicles, electric passenger vehicles, electric buses, and electric heavy trucks. These devices are connected to a power source to provide various functions or services.

[0048] The battery pack in the electric bus or electric heavy truck may include a box structure and battery modules. The box structure is generally a standard C box. The dimensions of a standard C box are L1060×W630×H240 mm.

[0049] A standard C box can accommodate three battery modules. Each module contains multiple battery cells, each of which includes a cell and a cell housing. The cell housing encloses and protects the cell, preventing it from being exposed. Specifically, the cell housing is fixed within the box structure.

[0050] When the above-mentioned electric buses or electric heavy trucks are used in harsh road conditions such as mines, the battery pack will vibrate for a long time along with the electrical device, resulting in stress concentration at the fixing points of the battery cell shell, thereby causing the battery cell shell to rupture and expose the battery cell, resulting in the risk of leakage, affecting the battery life and affecting the normal use of the electrical device.

[0051] Based on this, the present application provides a battery pack and an electrical device, which, by providing a buffer in the battery, avoids the stress concentration problem of the cell shell caused by long-term vibration of the battery pack, thereby extending the life of the battery and ensuring the normal use of the electrical device. Figures 1-6 Provide specific instructions.

[0052] In the first aspect, the present application provides a battery pack 100, including a box structure 1, a battery module 2, a structural adhesive 3 and a buffer 4. The box structure 1 includes a first bottom plate 11 and a first side plate 12, and the first bottom plate 11 and multiple first side plates 12 form a accommodating cavity. The battery module 2 is placed in the accommodating cavity. The battery module 2 may include multiple battery cells, each battery cell including a battery cell shell 21 and a battery cell, and the battery cell shell 21 is used to wrap and protect the battery cell so that the battery cell is not exposed. The battery cell shell 21 includes a second bottom plate 211 and a second side plate 212, and the second bottom plate 211 and the second side plate 212 are perpendicular to each other. The structural adhesive 3 is arranged on the first bottom plate 11, and is used to bond the second bottom plate 211 to the first bottom plate 11. The buffer member 4 is simultaneously bonded to the second bottom plate 211 , the second side plate 212 and the edge surface between the second bottom plate 211 and the second side plate 212 , so that part of the structural adhesive 3 is bonded to the second bottom plate 211 and the other part of the structural adhesive 3 is bonded to the buffer member 4 .

[0053] The box structure 1 may include a first bottom plate 11 and a plurality of first side plates 12. Figure 1 As shown, the box structure 1 includes a first bottom plate 11 and four first side plates 12. The four sides of the first bottom plate 11 are respectively connected to the bottom edges of the four first side plates 12, so that the four first side plates 12 and the first bottom plate 11 form a receiving cavity. The battery module 2 can be placed and fixed in this receiving cavity, so that the box structure 1 provides physical protection for the battery module 2, ensuring that the battery module 2 can operate safely under different environmental conditions.

[0054] Battery module 2 is composed of multiple battery cells connected in series or parallel to form a larger battery unit. The connection of multiple battery cells increases the voltage or capacity of battery module 2 to meet different application requirements. Battery cells are the basic units that convert chemical energy into electrical energy.

[0055] The battery cell may include a battery cell and a battery cell housing 21. The battery cell housing 21 is used to wrap and protect the battery cell so that the battery cell is not exposed and the electrolyte in the battery cell is prevented from leaking, thereby affecting the charge and discharge reaction of the battery.

[0056] Specifically, the cell housing 21 includes a second bottom plate 211 and a plurality of second side plates 212. Figure 2As shown, the cell housing 21 includes a second bottom plate 211 and four second side plates 212. The four sides of the second bottom plate 211 are connected to the bottom edges of the four second side plates 212, forming a receiving cavity with the four second side plates 212 and the second bottom plate 211. The battery cell can be placed and fixed in this receiving cavity without being exposed, ensuring that the battery cell can stably perform charge and discharge reactions in a closed environment.

[0057] Furthermore, the battery module 2 can be fixed in the accommodating cavity of the box structure 1 by means of structural adhesive 3. Specifically, Figure 3 As shown, the structural adhesive 3 is arranged on the first bottom plate 11 , and the second bottom plate 211 is pressed against the structural adhesive 3 , so that the battery module 2 composed of multiple battery cells can be fixed in the accommodating cavity of the box structure 1 .

[0058] Optionally, the structural adhesive 3 may be a thermally conductive structural adhesive, so that the structural adhesive 3 has both adhesiveness and thermal conductivity, and can dissipate heat for the battery module 2 while fixing the battery module 2 .

[0059] In order to adapt to the long-term vibration of the battery pack 100, the amount of structural adhesive 3 can be increased so that the structural adhesive 3 overflows from the second bottom plate 211 to the second side plate 212, thereby increasing the connection area between the box structure 1 and the battery module 2, and increasing the connection strength between the box structure 1 and the battery module 2, thereby ensuring the structural strength of the battery pack 100 under long-term vibration.

[0060] There is a second side plate 212 facing the first side plate 12 in each row of battery cells near the first side plate 12. Furthermore, when the structural adhesive 3 overflows from the second bottom plate 211 onto the second side plate 212, the edge surface between the second bottom plate 211 and the second side plate 212 is also coated with the structural adhesive 3, so that there is adhesion on the second bottom plate 211, the second side plate 212 and the above-mentioned edge surfaces.

[0061] In related art, multiple fixing points exist between the cell housing 21 and the box structure 1, establishing a rigid connection between the cell housing 21 and the box structure 1. Therefore, when the locations of the fixing points correspond to the locations of the second side panel 212 and / or the edge surfaces, the adhesive force applied by the structural adhesive 3 to the second side panel 212 and / or the edge surfaces can cause stress concentration at the second side panel 212 and / or the edge surfaces, potentially causing the cell housing 21 to rupture, exposing the cell and creating a risk of leakage, shortening the battery life, and affecting the normal use of electrical devices.

[0062] Based on this, Figure 3The illustrated buffer member 4 is simultaneously bonded to the second bottom plate 211, the second side plate 212, and the edge surface between the second bottom plate 211 and the second side plate 212, so that a portion of the structural adhesive 3 is bonded to the second bottom plate 211, while another portion of the structural adhesive 3 is bonded to the buffer member 4. This prevents the second side plate 212 and the aforementioned edge surface from directly contacting the structural adhesive 3. Consequently, when the fixing points between the cell housing 21 and the box structure 1 correspond to the positions of the second side plate 212 and / or the aforementioned edge surface, the bonding force of the second side plate 212 and / or the aforementioned edge surface is relatively low, thus avoiding stress concentration at the second side plate 212 and / or the aforementioned edge surface. This reduces the risk of the cell housing 21 rupturing, exposing the cell and causing leakage, thereby extending the battery life and ensuring the normal use of the electrical device.

[0063] In summary, the battery pack 100 provided in the present application includes a box structure 1, a battery module 2, structural adhesive 3 and a buffer 4. Structural adhesive 3 is provided on the first bottom plate 11 of the box structure 1, which is used to bond the second bottom plate 211 to the first bottom plate 11, thereby ensuring the structural strength of the battery pack 100 under long-term vibration. The battery module 2 includes a plurality of battery cells, and the battery cell shell 21 of the battery cell includes a second bottom plate 211 and a second side plate 212. The buffer 4 is bonded to the second bottom plate 211, the second side plate 212 and the edge surface between the second bottom plate 211 and the second side plate 212 at the same time, so that part of the structural adhesive 3 is bonded to the second bottom plate 211 and the other part of the structural adhesive 3 is bonded to the buffer 4, so that the second side plate 212 and the edge surface are not directly in contact with the structural adhesive 3, thereby reducing the risk of the battery cell shell 21 rupture and the risk of leakage caused by the battery cell exposure, extending the battery life, and ensuring the normal use of electrical devices.

[0064] In some embodiments, the buffer member 4 is a tape, and the adhesive force of the tape is less than the adhesive force of the structural adhesive 3 .

[0065] Adhesive tape is a widely used office product that is typically made up of two parts: a backing material (paper, plastic, cloth, etc.) and an adhesive. The backing material can be made of materials such as paper, plastic, and cloth, while the adhesive provides the stickiness that allows the tape to stick to various surfaces.

[0066] Structural adhesive 3 and adhesive tape differ significantly in their uses, performance, and application methods. Structural adhesive 3 is primarily used for bonding structural components subject to heavy loads. It offers high strength, peel resistance, and impact resistance, making it suitable for bonding similar or dissimilar materials such as metals, ceramics, plastics, rubber, and wood. Adhesive tape, on the other hand, is suitable for applications requiring lower bond strength but requiring greater ease and automation, such as carton sealing, protection during production, and securing plastic components in electronic products.

[0067] According to the above content, the adhesive force of the tape is smaller than that of the structural adhesive 3, so that the second side surface and edge surface in direct contact with the tape will not cause stress concentration due to excessive adhesive force.

[0068] Specifically, the tape may include but is not limited to masking tape, insulating tape, pressure-sensitive tape, etc.

[0069] To sum up, the buffer member 4 is set as a tape with an adhesive force smaller than that of the structural adhesive 3, so that the second side surface and the edge surface will not produce stress concentration problems due to excessive adhesive force, thereby reducing the risk of rupture of the battery cell shell 21 and leakage of the battery cell due to exposure, extending the life of the battery and ensuring the normal use of the electrical device.

[0070] In some embodiments, the adhesive force of the tape is less than 1 MPa.

[0071] Adhesion refers to the force between two or more objects that are held together by glue, tape or other adhesives. The unit of adhesion is megapascals (MPa).

[0072] When the bonding force is less than 1 MPa, the second side surface and the edge surface will not produce stress concentration problems due to excessive bonding force, thereby reducing the risk of the battery cell shell 21 breaking and the battery cell being exposed and leaking, extending the battery life and ensuring the normal use of the electrical device.

[0073] In some embodiments, as Figure 4 As shown, the adhesive tape includes a first section 41 and a second section 42 that are bent and formed. The first section 41 and the second section 42 are perpendicular to each other. The first section 41 is bonded to the second side panel 212. The second section 42 is bonded to the second bottom panel 211.

[0074] Specifically, the bending process means that the first section 41 and the second section 42 are continuous and integrated. Therefore, when the first section 41 is bonded to the second side panel 212 and the second section 42 is bonded to the second bottom panel 211, the edge surface between the second side panel 212 and the second bottom panel 211 is also bonded to the adhesive tape, leaving no gaps between the second side panel 212, the edge surface, and the second bottom panel 211. This prevents the structural adhesive 3 from bonding to the cell housing 21 through these gaps. This prevents stress concentration on the second side surface and the edge surface due to excessive bonding force, thereby reducing the risk of cell housing 21 rupture and battery cell exposure and leakage, extending the battery life, and ensuring the normal use of electrical devices.

[0075] According to the description of the above embodiment, the adhesive tape includes a first section 41 and a second section 42 that are bent and formed. The first section 41 is bonded to the second side panel 212, and the second section 42 is bonded to the second bottom panel 211. This prevents the structural adhesive 3 from adhering to the battery cell housing 21 through the gaps between the adhesive tapes. This prevents stress concentration on the second side surface and edges due to excessive adhesive force, thereby reducing the risk of rupture of the battery cell housing 21 and leakage of the exposed battery cells, extending the battery life, and ensuring the normal use of the electrical device.

[0076] In some embodiments, as Figure 2 and Figure 4 As shown, the size of the adhesive tape in the first direction X is greater than or equal to 70 mm. The first direction X is the length direction of the battery pack 100 .

[0077] Among them, Figure 5 and Figure 6 As shown, the battery module 2 includes multiple battery cells. Each battery cell has an edge facet between the second bottom plate 211 and the second side plate 212, and a bottom fillet 213 between the edge faces. Due to the manufacturing process of the battery cell housing 21, the bottom fillet 213 is the most vulnerable point in the battery cell housing 21, which is prone to cracking. Furthermore, the multiple battery cells are arranged along the first direction X, with the width between two adjacent battery cells being greater than or equal to 60 mm.

[0078] To sum up, the dimensions of the first section 41 and the second section 42 in the first direction X are both greater than or equal to 70 mm, so that the length of the edge surface covered by the tape can be greater than or equal to 70 mm, so that the bottom fillets 213 in the two adjacent battery cell shells 21 are covered by the tape, so that the bottom fillets 213 in the battery cell shell 21 will not cause stress concentration due to excessive adhesion force, thereby reducing the risk of rupture of the battery cell shell 21 and leakage of the battery cell, extending the life of the battery, and ensuring the normal use of the electrical device.

[0079] In some embodiments, as Figure 2 and Figure 4 As shown, the height of the structural adhesive 3 overflowing along the second side plate 212 is greater than or equal to 10 mm, and the height of the structural adhesive 3 overflowing along the second side plate 212 is less than or equal to 15 mm.

[0080] The greater the overflow height of the structural adhesive 3 along the second side plate 212 , the higher the connection strength between the battery cell housing 21 and the box structure 1 .

[0081] If the height of the structural adhesive 3 overflowing along the second side plate 212 is too large, it will affect the layout and installation of other components in the box structure 1.

[0082] Based on this, the height of the structural adhesive 3 overflowing along the second side panel 212 is greater than or equal to 10 mm, and the height of the structural adhesive 3 overflowing along the second side panel 212 is less than or equal to 15 mm, while ensuring the connection strength between the battery shell and the box body, it does not affect the layout and installation of other components in the box structure 1.

[0083] In some embodiments, as Figure 2 and Figure 4 As shown, the dimension of the first section 41 in the second direction Y is greater than or equal to 20 mm, and the dimension of the first section 41 in the second direction Y is less than or equal to 30 mm. The second direction Y is the height direction of the battery pack 100 .

[0084] The second direction Y is the height direction of the battery pack 100 and is also the height direction of the structural adhesive 3 overflowing along the second side panel 212. Therefore, the dimension of the first segment 41 in the second direction Y needs to be larger than the height of the structural adhesive 3 overflowing along the second side panel 212 to prevent the structural adhesive 3 from directly contacting the second side panel 212, thereby avoiding stress concentration on the second side panel 212.

[0085] Based on the height of the structural adhesive 3 overflowing along the second side plate 212 and in combination with relevant experimental data, the following conclusions can be drawn:

[0086] When the dimension of the first section 41 in the second direction Y is greater than or equal to 20 mm, and the dimension of the first section 41 in the second direction Y is less than or equal to 30 mm, the structural adhesive 3 will not directly contact the second side plate 212, thereby avoiding the problem of stress concentration on the second side plate 212, thereby reducing the risk of rupture of the battery cell shell 21 and leakage of the battery cell due to exposure, extending the battery life, and ensuring the normal use of electrical devices.

[0087] In some embodiments, as Figure 2 and Figure 4 As shown, the dimension of the second segment 42 in the third direction Z is greater than or equal to 10 mm, and the dimension of the second segment 42 in the third direction Z is less than or equal to 15 mm. The third direction Z is the width direction of the battery pack 100 .

[0088] The greater the overflow height of the structural adhesive 3 along the second side plate 212 , the higher the connection strength between the battery cell housing 21 and the box structure 1 .

[0089] If the height of the structural adhesive 3 overflowing along the second side plate 212 is too large, it will affect the layout and installation of other components in the box structure 1.

[0090] The bonding area of ​​the structural adhesive 3 on the first bottom surface is greater than 85% to ensure the connection strength between the cell housing 21 and the box structure 1. Therefore, the dimension of the second segment 42 in the third direction Z cannot be too large, so as to avoid insufficient bonding area for the structural adhesive 3, thereby affecting the connection strength between the cell housing 21 and the box structure 1. Furthermore, the dimension of the second segment 42 in the third direction Z cannot be too small, so as to avoid stress concentration near the edge surface of the second bottom plate 211.

[0091] Based on this, when the size of the second section 42 in the third direction Z is greater than or equal to 10 mm, and the size of the second section 42 in the third direction Z is less than or equal to 15 mm, it can not only ensure the connection strength between the battery cell shell 21 and the box structure 1, but also avoid the problem of stress concentration near the edge surface of the second bottom plate 211, thereby reducing the risk of rupture of the battery cell shell 21 and exposure of the battery cell to cause leakage, extending the battery life, and ensuring the normal use of electrical devices.

[0092] In a second aspect, the present application provides an electrical device, comprising the battery pack 100 according to any one of the above embodiments.

[0093] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0094] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: Box structure, battery module, structural adhesive and buffer parts; The box structure includes a first bottom plate and a first side plate, wherein the first bottom plate and a plurality of the first side plates form a receiving cavity; The battery module is placed in the accommodating cavity; The battery module includes a plurality of battery cells, each of which includes a battery cell shell and a battery cell, wherein the battery cell shell is used to wrap and protect the battery cell so that the battery cell is not exposed; The battery cell housing includes a second bottom plate and a second side plate, and the second bottom plate and the second side plate are perpendicular to each other; The structural adhesive is provided on the first bottom plate and is used to bond the second bottom plate to the first bottom plate; The buffer is simultaneously bonded to the second bottom plate, the second side plate and the edge surface between the second bottom plate and the second side plate, so that part of the structural adhesive is bonded to the second bottom plate and the other part of the structural adhesive is bonded to the buffer.

2. The battery pack according to claim 1, wherein: The buffer member is adhesive tape; The adhesive force of the adhesive tape is smaller than the adhesive force of the structural adhesive.

3. The battery pack according to claim 2, wherein: The adhesive force of the adhesive tape is less than 1 MPa.

4. The battery pack according to claim 2, wherein: The adhesive tape includes a first section and a second section that are bent and formed; The first section and the second section are perpendicular to each other; The first section is bonded to the second side panel; The second section is bonded to the second bottom plate.

5. The battery pack according to claim 4, characterized in that: The size of the adhesive tape in the first direction is greater than or equal to 70 mm; The first direction is the length direction of the battery pack.

6. The battery pack according to claim 4, characterized in that: The height of the structural adhesive overflowing along the second side panel is greater than or equal to 10 mm, and the height of the structural adhesive overflowing along the second side panel is less than or equal to 15 mm.

7. The battery pack according to claim 4, characterized in that: The dimension of the first segment in the second direction is greater than or equal to 20 mm, and the dimension of the first segment in the second direction is less than or equal to 30 mm; The second direction is the height direction of the battery pack.

8. The battery pack according to claim 4, characterized in that: The dimension of the second segment in the third direction is greater than or equal to 10 mm, and the dimension of the second segment in the third direction is less than or equal to 15 mm; Wherein, the third direction is the width direction of the battery pack.

9. An electrical device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 8.

Images