Batteries and battery packs

Abstract

The application provides a pressing strip and a battery pack. The pressing strip comprises a locking part, a limiting part, a reinforcing part, and a receiving space in the limiting part. The reinforcing part is partially arranged in the receiving space, and the two ends of the reinforcing part extend out of the receiving space and are connected with the locking part. The pressing strip and the battery pack are simple in structure, convenient to manufacture, can effectively constrain the position of the battery cell stack, and improve the stability and safety of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a pressure bar and a battery pack. Background Technology

[0002] A battery pack is a unit composed of multiple stacked battery cells assembled within a casing, used to store and provide electrical energy. To ensure the stability of the stacked cells within the casing, a pressure bar structure is typically used to restrain their position. However, existing pressure bars offer limited constraint on the stacked cells, allowing for displacement and potential safety hazards. Therefore, a more stable pressure bar is urgently needed. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a pressure strip and a battery pack to solve the related problems mentioned in the background art.

[0004] In a first aspect, this application provides a pressure strip, comprising: a locking portion; a limiting portion having an accommodating space; and a reinforcing portion partially disposed within the accommodating space, with both ends of the reinforcing portion extending out of the accommodating space and connected to the locking portion.

[0005] Furthermore, the locking part has a limiting groove on the side away from the limiting part, and a through hole is provided near the bottom of the limiting groove; the end of the reinforcing part extends through the through hole to form a bent part, and the bent part is connected to the limiting groove.

[0006] Furthermore, the reinforcing part includes two oppositely arranged strips, each strip having a bend at both ends along its length; at the same locking part, the ends of the two strips pass through the through hole to form two oppositely arranged bends.

[0007] Furthermore, the limiting part includes two independent limiting structures, which are connected to define the accommodating space between them; each limiting structure includes a first limiting part and a second limiting part connected to each other, the second limiting part being fitted to the reinforcing part, and an included angle being formed between the first limiting part and the second limiting part.

[0008] Furthermore, the top of the second limiting portion is provided with a first blocking portion, which at least partially covers the top surface of the reinforcing portion; and / or, the bottom of the second limiting portion is provided with a second blocking portion, which at least partially covers the bottom surface of the reinforcing portion.

[0009] Furthermore, the first blocking portion includes an upper blocking portion and a lower blocking portion, and the space defined between the upper blocking portion and the lower blocking portion of the two second limiting portions is filled with adhesive.

[0010] Furthermore, the limiting part is constructed as an integrally molded structural component. The limiting part includes a first limiting part and two second limiting parts connected to each other to define the accommodating space among the three. One end of each of the two second limiting parts is connected to the first limiting part, and the other end defines an installation port communicating with the accommodating space. The second limiting parts are fitted to the reinforcing part, and an included angle is formed between the first limiting part and the second limiting parts.

[0011] Furthermore, the limiting part is constructed as an integrally formed structural component. The limiting part includes two connected first limiting parts and one second limiting part. The second limiting part is a U-shaped structure with the opening facing upward, so as to define the accommodating space inside. The opening is constructed as an installation port communicating with the accommodating space. One end of each of the two first limiting parts is connected to the two sides of the opening of the second limiting part. The second limiting part is fitted to the reinforcing part, and an included angle is formed between the first limiting part and the second limiting part.

[0012] Furthermore, the limiting part is constructed as an integrally formed structural component, the limiting part includes a first limiting part and a second limiting part connected to each other, a through hole is formed in the second limiting part along its extension direction to define the accommodating space, one end of the second limiting part is connected to the first limiting part, and an included angle is formed between the first limiting part and the second limiting part.

[0013] Furthermore, both the reinforcing part and the locking part are constructed as metal structural components, and the reinforcing part and the locking part are welded together; the limiting part is constructed as a carbon fiber and glass fiber composite material structural component, and the limiting part and the reinforcing part are bonded and fixed together.

[0014] A second aspect of this application provides a battery pack including a cooperating housing and a top cover. The housing includes an enclosing side beam. The housing contains a cell stack and a pressure strip as described in the first aspect above. The locking portion of the pressure strip is connected to the side beam, and the limiting portion of the pressure strip is disposed between two adjacent cell stacks and cooperates with the top and side surfaces of the cell stacks.

[0015] As described above, the pressure strip and battery pack provided in this application include a locking part, a limiting part, and a reinforcing part. The locking part connects to the side beams of the battery pack, restricting the position of the cell stack in the length direction. The limiting part cooperates with the top and side surfaces of the cell stack in the battery pack, restricting the position of the cell stack in the height and width directions. The limiting part has an accommodating space, and the reinforcing part is partially disposed within the accommodating space. Both ends of the reinforcing part extend out of the accommodating space and connect with the locking part, achieving the effect of strengthening the overall structure. Through the cooperation of the reinforcing part, locking part, and limiting part, the cell stack can be constrained in three directions, reducing the risk of deformation and displacement, thereby improving the stability and safety of the battery pack. This pressure strip and battery pack has a simple structure, is easy to manufacture, and can effectively constrain the position of the cell stack, improving the stability and safety of the battery pack. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the first type of pressure strip in the embodiments of this application.

[0018] Figure 2 for Figure 1 A schematic diagram of the exploded structure of the intermediate pressure bar.

[0019] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle.

[0020] Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure of the intermediate pressure bar.

[0021] Figure 5 This is a schematic diagram of the partial explosion structure of the second type of pressure strip in the embodiments of this application.

[0022] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure of the middle limiting part and the reinforcing part.

[0023] Figure 7 This is a schematic diagram of the partial explosion structure of the third type of pressure strip in the embodiments of this application.

[0024] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure of the middle limiting part and the reinforcing part.

[0025] Figure 9 This is a schematic diagram of the partial explosion structure of the fourth type of pressure strip in the embodiments of this application.

[0026] Figure 10 for Figure 9 A schematic diagram of the cross-sectional structure of the middle limiting part and the reinforcing part.

[0027] Figure 11 This is a schematic diagram of the structure of a battery pack according to an embodiment of this application.

[0028] Figure 12 for Figure 11 A schematic diagram of the cross-sectional structure of the medium-voltage strip and the battery cell stack.

[0029] Reference numerals: 1. Reinforcing part; 1-1. Bending part; 1-2. Strip-shaped part; 2. Limiting part; 2-1. First limiting part; 2-2. Second limiting part; 2-3. First shielding part; 2-4. Second shielding part; 2-5. Upper shielding part; 2-6. Lower shielding part; 2-7. Limiting structure; 2-8. Accommodating space; 3. Locking part; 3-1. Limiting groove; 3-2. Through hole; 3-3. Connecting hole; 4. Cell stack; 5. Housing; 5-1. Side beam. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0031] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] In related technologies, the pressure strips for battery packs often adopt a metal welded structure with a T-shaped or L-shaped cross-section, and their installation is only achieved through embedded plug-in, resulting in significant limitations in terms of three-dimensional spatial constraints. The pressure strip only considers the constraint effect on the cell stack in the height direction, while lacking sufficient constraint force in the horizontal direction. If the cell stack moves horizontally, it will also cause systemic safety hazards, such as the risk of thermal runaway due to cell short circuits.

[0033] The following describes specific embodiments in conjunction with the appendix. Figures 1 to 12 The technical solution of this application will be described in further detail.

[0034] In some embodiments of this application, a pressure strip is provided, including: a locking part 3; a limiting part 2, the limiting part 2 having an accommodating space 2-8; and a reinforcing part 1, the reinforcing part 1 being partially disposed within the accommodating space 2-8, the two ends of the reinforcing part 1 extending out of the accommodating space 2-8 and connected to the locking part 3.

[0035] like Figure 1 The diagram shown is a structural schematic of a pressure strip. The pressure strip includes a reinforcing part 1, a limiting part 2, and a locking part 3. Figure 2 As shown, Figure 1 A schematic diagram of the exploded structure of the intermediate pressure bar. In the diagram, the L direction is the length direction of the reinforcing part 1, the W direction is the width direction of the reinforcing part 1, and the H direction is the height direction of the reinforcing part 1, which is also the height direction of the cell stack 4 in the battery pack.

[0036] The reinforcing part 1 is made of a rigid material, for example, to provide structural strength for the pressure bar. The reinforcing part 1 is a strip-shaped structure, and its length is greater than or equal to the length of the cell stack 4 to ensure the installation of the locking part 3.

[0037] A locking part 3 is provided at each end of the reinforcing part 1 along its length. The locking part 3 can be set perpendicular to the reinforcing part 1, and the connection between the locking part 3 and the reinforcing part 1 is, for example, by welding or snap-fit. The locking part 3 is made of a rigid material, for example, to provide structural strength for the pressure strip. The locking part 3 can be connected to the side beam 5-1 of the battery pack housing 5. The side beam 5-1 is set to abut against the side of the cell stack 4. The position of the side beam 5-1 is restricted by the cooperation of the reinforcing part 1 and the locking part 3, thereby restricting the position of the cell stack 4 in the length direction. The locking part 3 provides a restraining force for the expansion of the cells and can effectively absorb and disperse the expansion stress, preventing structural damage caused by local stress concentration.

[0038] The limiting part 2 is made of insulating material, for example, to provide insulation. The cross-sectional shape of the limiting part 2 is, for example, L-shaped or T-shaped. After the reinforcing part 1 is fixed, the limiting part 2 can cooperate with the top and side surfaces of the battery cell stack 4, restricting the position of the battery cell stack 4 in its height and width directions, effectively reducing the risk of deformation and displacement. The limiting part 2 has a receiving space 2-8, which can be formed by grooves, through holes, or structural gaps. The receiving space 2-8 can enclose the reinforcing part 1, providing protection and ensuring the safety of the battery pack.

[0039] The reinforcing part 1, the locking part 3, and the limiting part 2 work together to constrain the cell stack 4 in three directions, jointly resisting the stress generated by external impact and internal electrochemical action. This composite structure significantly improves the structural modes of the battery pack, enhances the overall rigidity, effectively suppresses the structural deformation caused by cell expansion, and improves the cycle life and safety of the battery pack.

[0040] The pressure strip structure is simple and easy to manufacture. It can effectively constrain the position of the cell stack 4 and improve the stability and safety of the battery pack.

[0041] In some embodiments, both the reinforcing part 1 and the locking part 3 are constructed as metal structural components, and the reinforcing part 1 and the locking part 3 are welded together; the limiting part 2 is constructed as a carbon fiber and glass fiber composite material structural component, and the limiting part 2 and the reinforcing part 1 are bonded and fixed together.

[0042] In some technologies, the pressure strip is made entirely of metal, which, while strong, has a high density, increasing the overall weight of the battery pack and hindering lightweight design. If a pressure strip is made of plastic, it is prone to plastic deformation under long-term vibration conditions, leading to limit failure.

[0043] In this embodiment, both the reinforcing part 1 and the locking part 3 are made of metal, such as steel, while the limiting part 2 is made of a carbon fiber and glass fiber composite material. The limiting part 2 can be connected to the reinforcing part 1 using structural adhesive bonding, and it can also be connected to the battery cell stack 4 using adhesive bonding. The high damping characteristics of the composite material can absorb high-frequency vibration energy. Combined with the low-frequency stiffness adjustment of the steel components, this increases the system's modal frequency, reduces the risk of resonance, and achieves weight reduction while ensuring support stiffness.

[0044] In some embodiments, the locking part 3 has a limiting groove 3-1 on the side away from the limiting part 2, and the limiting groove 3-1 has a through hole 3-2 near the bottom of the groove of the limiting part 2; the end of the reinforcing part 1 extends through the through hole 3-2 to form a bent part 1-1, and the bent part 1-1 is connected to the limiting groove 3-1.

[0045] Some technologies use metal welded strips, requiring multi-station welding, resulting in numerous manufacturing steps and significant difficulty in controlling welding deformation, necessitating additional alignment processes. Furthermore, the metal strip must be fully welded before surface insulation can be applied; however, the oxide layer created by welding reduces adhesive strength, increasing the risk of insulation failure.

[0046] This embodiment optimizes the welding structure, such as... Figure 3 As shown, Figure 2 The enlarged structural diagram of the intermediate pressure bar at point A shows that a limiting groove 3-1 is provided on the side of the locking part 3 away from the limiting part 2, and a through hole 3-2 is provided at the bottom of the limiting groove 3-1 near the limiting part 2. The end of the reinforcing part 1 extends through the through hole 3-2 and forms a bent part 1-1 at the end of the reinforcing part 1. The bent part 1-1 cooperates with the limiting groove 3-1, so that the locking part 3 can limit the length of the reinforcing part 1. The reinforcing part 1 can be a steel bar, and the bent part 1-1 can be formed by bending the steel bar after it passes through the through hole 3-2.

[0047] The welding position of the locking part 3 and the reinforcing part 1 can be selected at the side wall where the limiting groove 3-1 abuts against the bending part 1-1, instead of at the through hole 3-2. This makes welding more convenient and eliminates the need for a straightening process. In addition, this method ensures a stable connection, and the oxide layer formed by welding will not interfere with the adhesion between the limiting part 2 and the reinforcing part 1, resulting in better stability.

[0048] In some embodiments, the reinforcing part 1 includes two oppositely arranged strips 1-2, each of the strips 1-2 having a bend 1-1 at both ends along its length; at the same locking part 3, the ends of the two strips 1-2 pass through the through hole 3-2 to form two oppositely arranged bends 1-1.

[0049] like Figure 3 As shown, the reinforcing part 1 includes two oppositely arranged strips 1-2. Thus, at the same locking part 3, the ends of the two strips 1-2 pass through the through hole 3-2, forming two oppositely arranged bent parts 1-1 that cooperate with the limiting groove 3-1, further ensuring the stability of the cooperation between the reinforcing part 1 and the locking part 3.

[0050] In some embodiments, the limiting groove 3-1 is provided with a connecting hole 3-3 on each of the opposite sides along the width direction of the reinforcing part, and the connecting hole 3-3 is used to bolt to the side beam 5-1.

[0051] like Figure 3As shown, the locking part 3 has two connecting holes 3-3, located on opposite sides of the limiting groove 3-1 along the W direction. The connecting holes 3-3 can be bolted to the side beam 5-1 to form a stable mechanical connection interface. This connection method not only ensures the integrity of the structure but also provides bidirectional constraint force for the expansion of the battery cell. When the volume of the battery cell changes, the locking part 3 can effectively absorb and disperse the expansion stress, preventing structural damage caused by local stress concentration.

[0052] In some embodiments, the limiting part 2 includes two independent limiting structures 2-7, which are connected to define the accommodating space 2-8 between them; each limiting structure 2-7 includes a first limiting part 2-1 and a second limiting part 2-2 connected to each other, the second limiting part 2-2 being fitted to the reinforcing part 1, and an included angle being formed between the first limiting part 2-1 and the second limiting part 2-2.

[0053] like Figure 3 As shown, the limiting part 2 includes two independent limiting structures 2-7. Each limiting structure 2-7 can be bonded or snapped into the reinforcing part 1. The two limiting structures 2-7 are connected to define an accommodating space 2-8 between them, which can protect the reinforcing part 1. The two limiting structures 2-7 are arranged opposite to each other, which can limit the battery cell stacks 4 on both sides while protecting the reinforcing part 1.

[0054] The cross-sectional shape of the limiting structure 2-7 is, for example, L-shaped or T-shaped. Each limiting structure 2-7 includes a connected first limiting part 2-1 and a second limiting part 2-2, which can be integrally molded. The second limiting part 2-2 is fitted to the reinforcing part 1 and can cooperate with the side of the cell stack 4, for example, abutting and bonding, to limit the position of the cell stack 4 in the width direction.

[0055] An angle is formed between the first limiting part 2-1 and the second limiting part 2-2, such as 60°, 90°, or 120°, which can cooperate with the top surface of the cell stack 4, for example, abutting and adhering to it, thus limiting the position of the cell stack 4 in the height direction. The angle between the first limiting part 2-1 and the second limiting part 2-2 is preferably 90°, that is, the first limiting part 2-1 is set perpendicular to the reinforcing part 1, which provides a better limiting effect.

[0056] In some embodiments, the top of the second limiting portion 2-2 is provided with a first blocking portion 2-3, the first blocking portion 2-3 at least partially covering the top surface of the reinforcing portion 1; and / or, the bottom of the second limiting portion 2-2 is provided with a second blocking portion 2-4, the second blocking portion 2-4 at least partially covering the bottom surface of the reinforcing portion 1.

[0057] like Figure 3 As shown, the top of the second limiting part 2-2 is provided with a first shielding part 2-3, which is located, for example, at the connection between the first limiting part 2-1 and the second limiting part 2-2. The first shielding part 2-3 can at least partially cover the top surface of the reinforcing part 1, improving insulation performance, and can also constrain the position of the reinforcing part 1. The width of the first shielding part 2-3 is, for example, half the width of the reinforcing part 1. In this way, when the first shielding parts 2-3 of the two limiting structures 2-7 cooperate, they can completely shield the top surface of the reinforcing part 1, further improving insulation performance. When the limiting structure 2-7 is only provided with the first shielding part 2-3, the first shielding part 2-3 and the two second limiting parts 2-2 define an accommodating space 2-8, protecting the reinforcing part 1.

[0058] like Figure 3 As shown, the bottom of the second limiting part 2-2 is provided with a second shielding part 2-4. The second shielding part 2-4 can at least partially cover the bottom surface of the reinforcing part 1, which can also improve the insulation performance and constrain the position of the reinforcing part 1. The width of the second shielding part 2-4 can also be half the width of the reinforcing part 1. In this way, when the second shielding parts 2-4 of the two limiting structures 2-7 cooperate, they can completely shield the bottom surface of the reinforcing part 1, further improving the insulation performance. When the limiting structure 2-7 is only provided with the second shielding part 2-4, the second shielding part 2-4 and the two second limiting parts 2-2 define the accommodating space 2-8, protecting the reinforcing part 1.

[0059] When the first shielding part 2-3 and the second shielding part 2-4 are provided at the same time, the first shielding part 2-3, the second shielding part 2-4 and the two second limiting parts 2-2 together define the accommodating space 2-8, which can constrain the reinforcing part 1 and improve stability and insulation.

[0060] In some embodiments, the first blocking portion 2-3 includes an upper blocking portion 2-5 and a lower blocking portion 2-6, and the space defined between the upper blocking portion 2-5 and the lower blocking portion 2-6 of the two second limiting portions 2-2 is filled with adhesive.

[0061] The number of the first blocking parts 2-3 is, for example, one or more. Figure 4 As shown, the first shielding part 2-3 includes an upper shielding part 2-5 and a lower shielding part 2-6. The lower shielding part 2-6 can be disposed against the reinforcing part 1. The upper shielding part 2-5 can also block impurities from entering the accommodating space 2-8 and reduce the amount of material used and the weight of the pressure strip.

[0062] like Figure 4 As shown, the space defined between the upper blocking part 2-5 and the lower blocking part 2-6 of the two second limiting parts 2-2 is filled with glue, which can make the two limiting structures 2-7 firmly bonded and effectively protect the reinforcing part 1.

[0063] In some embodiments, the limiting part 2 is constructed as an integrally formed structural component. The limiting part 2 includes a first limiting part 2-1 and two second limiting parts 2-2 connected to each other to define the accommodating space 2-8. One end of each of the two second limiting parts 2-2 is connected to the first limiting part 2-1, and the other end defines an installation port communicating with the accommodating space 2-8. The second limiting parts 2-2 are fitted to the reinforcing part 1, and an included angle is formed between the first limiting part 2-1 and the second limiting parts 2-2.

[0064] like Figure 5 The diagram shown is a partial exploded view of a pressure strip. The limiting part 2 is constructed as a one-piece molded structure, making it easier to manufacture. The limiting part 2 includes a first limiting part 2-1 and two second limiting parts 2-2 connected together, defining an accommodating space 2-8 between the three, as shown. Figure 5 As shown, the accommodating space 2-8 is a through-slot structure with the opening facing downwards. One end of each of the two second limiting parts 2-2 is connected to the first limiting part 2-1, which can protect the reinforcing part 1 and prevent impurities from entering the accommodating space 2-8. The other end defines an installation port that communicates with the accommodating space 2-8, which facilitates the installation of the reinforcing part 1.

[0065] like Figure 6 As shown, Figure 5 A cross-sectional schematic diagram of the intermediate pressure strip. An angle is formed between the first limiting part 2-1 and the second limiting part 2-2, such as 60°, 90°, or 120°. The first limiting part 2-1 can mate with the top surface of the cell stack 4, for example, abutting and adhering to it, restricting the position of the cell stack 4 in the height direction. The second limiting part 2-2 is fitted to the reinforcing part 1, and the second limiting part 2-2 can mate with the side surface of the cell stack 4, for example, abutting and adhering to it, restricting the position of the cell stack 4 in the width direction.

[0066] In some embodiments, the limiting part 2 is constructed as an integrally formed structural component. The limiting part 2 includes two connected first limiting parts 2-1 and a second limiting part 2-2. The second limiting part 2-2 is a U-shaped structure with its opening facing upward, so as to define the accommodating space 2-8 inside. The opening is constructed as an installation port communicating with the accommodating space 2-8. One end of each of the two first limiting parts 2-1 is connected to the two sides of the opening of the second limiting part 2-2 respectively. The second limiting part 2-2 is fitted to the reinforcing part 1. An included angle is formed between the first limiting part 2-1 and the second limiting part 2-2.

[0067] like Figure 7The diagram shows a partial exploded view of a pressure strip. The limiting part 2 is a one-piece molded structure, making it easier to manufacture. The limiting part 2 includes two connected first limiting parts 2-1 and one second limiting part 2-2. The second limiting part 2-2 is a U-shaped structure with its opening facing upwards, defining an accommodating space 2-8 within it. The opening is a mounting port that communicates with the accommodating space 2-8, facilitating the installation of the reinforcing part 1. One end of each of the two first limiting parts 2-1 is connected to both sides of the opening of the second limiting part 2-2 to protect the reinforcing part 1 and prevent impurities from entering the accommodating space 2-8.

[0068] like Figure 8 As shown, Figure 7 A cross-sectional schematic diagram of the intermediate pressure strip. An angle is formed between the first limiting part 2-1 and the second limiting part 2-2, such as 60°, 90°, or 120°. The first limiting part 2-1 can mate with the top surface of the cell stack 4, for example, abutting and adhering to it, restricting the position of the cell stack 4 in the height direction. The second limiting part 2-2 is fitted to the reinforcing part 1, and the second limiting part 2-2 can mate with the side surface of the cell stack 4, for example, abutting and adhering to it, restricting the position of the cell stack 4 in the width direction.

[0069] In some embodiments, the limiting part 2 is constructed as an integrally formed structural component. The limiting part 2 includes a first limiting part 2-1 and a second limiting part 2-2 connected to each other. A through hole is formed in the second limiting part 2-2 along its extension direction to define the accommodating space 2-8. One end of the second limiting part 2-2 is connected to the first limiting part 2-1. An included angle is formed between the first limiting part 2-1 and the second limiting part 2-2.

[0070] like Figure 9 The diagram shown is a partial exploded view of a pressure strip. The limiting part 2 is a one-piece molded structure, making it easier to manufacture. The limiting part 2 includes a first limiting part 2-1 and a second limiting part 2-2 connected to each other. A through hole is formed in the second limiting part 2-2 along its extension direction to define an accommodating space 2-8. The extension direction is the L direction. The accommodating space 2-8 accommodates the reinforcing part 1, achieving all-round protection. In terms of manufacturing process, the limiting part 2 and the reinforcing part 1 can be manufactured separately, and then the reinforcing part 1 can be inserted into the through hole to make the pressure strip. Alternatively, the reinforcing part 1 and the limiting part 2 can be extruded simultaneously to make the pressure strip. The specific method is not limited.

[0071] like Figure 10 As shown, Figure 9A cross-sectional schematic diagram of the intermediate pressure strip. One end of the second limiting part 2-2 is connected to the first limiting part 2-1. An angle is formed between the first limiting part 2-1 and the second limiting part 2-2, such as 60°, 90°, or 120°. The first limiting part 2-1 can cooperate with the top surface of the cell stack 4, for example, by abutting and adhering to it, thus limiting the position of the cell stack 4 in the height direction. The second limiting part 2-2 can cooperate with the side surface of the cell stack 4, for example, by abutting and adhering to it, thus limiting the position of the cell stack 4 in the width direction.

[0072] In some embodiments of this application, a battery pack is provided, including a housing 5 and a top cover. The housing 5 includes an enclosing side beam 5-1. The housing 5 is provided with a cell stack 4 and a pressure strip as described in any of the above embodiments. The locking part 3 of the pressure strip is connected to the side beam 5-1. The limiting part 2 of the pressure strip is disposed between two adjacent cell stacks 4 and cooperates with the top surface and side surface of the cell stack 4.

[0073] like Figure 11 The diagram shows a schematic of a battery pack. The battery pack includes a housing 5 and a top cover. The housing 5 includes side beams 5-1 forming a receiving space, within which multiple battery cell stacks 4 are arranged. Each battery cell stack 4 is composed of multiple battery cells stacked together. Pressure strips are provided between the battery cell stacks 4.

[0074] The locking part 3 of the pressure strip is connected to the side beam 5-1. The side beam 5-1 is made of insulating material and can be provided with a mounting groove. The locking part 3 is located in the mounting groove to avoid direct contact with the battery cell stack 4, thus providing insulation. The mounting groove can be provided with mounting holes, which mate with the connecting holes 3-3 of the locking part 3 for bolt connection.

[0075] like Figure 12 As shown, Figure 11 A cross-sectional schematic diagram of the interaction between the pressure strip and the cell stack 4. The limiting part 2 of the pressure strip is set between two adjacent cell stacks 4, which can limit the cell stacks 4 on both sides. The limiting part 2 cooperates with the cell stack 4. Its first limiting part 2-1 can abut and adhere to the top surface of the cell stack 4, and its second limiting part 2-2 can abut and adhere to the side surface of the cell stack 4, thereby achieving overall constraint on the cell stack 4 in three directions.

[0076] The battery pack has a strong structural stability and a long service life.

[0077] Battery packs can be used in electrical devices, including vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0078] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0079] Furthermore, given that details have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that embodiments of this application may be practiced without these details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0080] Although this application has been described in conjunction with embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0081] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A pressure strip, characterized in that, include: Locking part; A limiting part, wherein the limiting part has an accommodating space; A reinforcing part is partially disposed within the accommodating space, with both ends of the reinforcing part extending out of the accommodating space and connected to the locking part.

2. The pressure strip according to claim 1, characterized in that, The locking part has a limiting groove on the side away from the limiting part, and a through hole is provided near the bottom of the limiting groove; the end of the reinforcing part extends through the through hole to form a bent part, and the bent part is connected to the limiting groove.

3. The pressure strip according to claim 2, characterized in that, The reinforcing part includes two oppositely arranged strips, each strip having a bend at both ends along its length; at the same locking part, the ends of the two strips pass through the through hole to form two oppositely arranged bends.

4. The pressure strip according to claim 1, characterized in that, The limiting part includes two independent limiting structures, which are connected to define the accommodating space between them; each limiting structure includes a first limiting part and a second limiting part connected to each other, the second limiting part being fitted to the reinforcing part, and an included angle being formed between the first limiting part and the second limiting part.

5. The pressure strip according to claim 4, characterized in that, The second limiting part has a first blocking part at the top, which at least partially covers the top surface of the reinforcing part; and / or, the second limiting part has a second blocking part at the bottom, which at least partially covers the bottom surface of the reinforcing part.

6. The pressure strip according to claim 5, characterized in that, The first blocking portion includes an upper blocking portion and a lower blocking portion, and the space defined between the upper blocking portion and the lower blocking portion of the two second limiting portions is filled with adhesive.

7. The pressure strip according to claim 1, characterized in that, The limiting part is constructed as an integrally molded structural component. The limiting part includes a first limiting part and two second limiting parts connected to each other to define the accommodating space among the three. One end of each of the two second limiting parts is connected to the first limiting part, and the other end defines an installation port that communicates with the accommodating space. The second limiting parts are fitted to the reinforcing part, and an included angle is formed between the first limiting part and the second limiting parts.

8. The pressure strip according to claim 1, characterized in that, The limiting part is constructed as an integrally molded structural component. The limiting part includes two connected first limiting parts and one second limiting part. The second limiting part is a U-shaped structure with the opening facing upward, so as to define the accommodating space inside. The opening is constructed as an installation port connected to the accommodating space. One end of each of the two first limiting parts is connected to the two sides of the opening of the second limiting part. The second limiting part is fitted to the reinforcing part. An included angle is formed between the first limiting part and the second limiting part.

9. The pressure strip according to claim 1, characterized in that, The limiting part is constructed as an integrally formed structural component. The limiting part includes a first limiting part and a second limiting part connected to each other. A through hole is formed in the second limiting part along its extension direction to define the accommodating space. One end of the second limiting part is connected to the first limiting part, and an included angle is formed between the first limiting part and the second limiting part.

10. The pressure strip according to claim 1, characterized in that, Both the reinforcing part and the locking part are constructed as metal structural components, and the reinforcing part and the locking part are welded together; the limiting part is constructed as a carbon fiber and glass fiber composite material structural component, and the limiting part and the reinforcing part are bonded and fixed together.

11. A battery pack, characterized in that, The device includes a housing and a top cover. The housing includes enclosing side beams. The housing contains a cell stack and a pressure strip as described in any one of claims 1-10. The locking part of the pressure strip is connected to the side beams. The limiting part of the pressure strip is disposed between two adjacent cell stacks and cooperates with the top and side surfaces of the cell stacks.

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