Battery box and battery pack

Abstract

The application provides a battery box and a battery pack, comprising: a box body provided with two oppositely arranged anti-expansion members, a containing space being arranged between the two anti-expansion members; at least one reinforcing member connected between the two anti-expansion members; at least one end of the reinforcing member being connected with a connecting member, the connecting member being connected with the anti-expansion member on the same side and away from the containing space, and the anti-expansion member being connected with the connecting member. Through the cooperation of the reinforcing member and the connecting member, the force generated by the expansion of the battery module can be effectively dispersed and borne, and the structural stability and safety of the battery box are improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery box and battery pack. Background Technology

[0002] During the use of battery modules, heat is generated due to charging and discharging operations, causing the battery modules to expand. The battery box needs to have an effective anti-expansion structure to cope with this expansion force, so as to prevent the battery modules from being damaged due to excessive expansion, which in turn affects the normal operation of the entire battery system.

[0003] Currently, some battery boxes in related technologies employ anti-expansion structures, mainly composed of two anti-expansion beams and tie rods connecting these two beams. This structure can protect the battery module to a certain extent. When the battery module expands, the interaction between the components disperses and bears the expansion force, thus maintaining the overall structural stability of the battery box.

[0004] However, in this structure, stress concentration occurs at the connection between the tie rod and the anti-expansion beam, which may lead to the tie rod separating from the anti-expansion beam or the connection breaking, thereby threatening the safety and reliability of the battery system. Utility Model Content

[0005] Embodiments of this application provide a battery box and battery pack that can improve the technical problem of stress concentration at the connection between the tie rod and the anti-expansion component.

[0006] In a first aspect, embodiments of this application provide a battery box, comprising: a box body, having two anti-expansion members disposed opposite to each other, with an accommodating space between the two anti-expansion members; at least one reinforcing member connected between the two anti-expansion members; at least one end of the reinforcing member is connected to a connecting member, the connecting member being fixedly connected to the side of the anti-expansion member on which it is located that is away from the accommodating space.

[0007] By combining reinforcing components and connectors, the forces generated by the expansion of the battery module are effectively dispersed and borne, thereby improving the structural stability and safety of the battery box.

[0008] In some embodiments, the connector includes a mounting block, and the side of the anti-expansion member away from the accommodating space is provided with a mounting groove, and the corresponding mounting block is inserted into and fixed to the mounting groove.

[0009] The plug-in installation method simplifies the assembly process, improves installation efficiency, and ensures a stable connection between the connector and the anti-expansion component.

[0010] In some embodiments, the plane parallel to the bottom wall of the housing is used as the cross section, the cross section of the mounting groove is a trapezoidal profile, and the cross section of the mounting block is a trapezoidal surface adapted to the trapezoidal profile.

[0011] The trapezoidal profile design increases the contact area and friction between the mounting block and the mounting groove, preventing the mounting block from wobbling or detaching within the mounting groove and improving the stability of the connection.

[0012] In some embodiments, the trapezoidal profile includes a first side and a second side that are parallel to each other, the first side being shorter than the second side, and the first side being oriented toward the accommodating space.

[0013] The short side facing the accommodating space allows the force on the mounting block within the mounting groove to be distributed more evenly to the anti-expansion component, reducing the risk of structural damage due to excessive stress.

[0014] In some embodiments, the number of reinforcing members is 1-6.

[0015] A reasonable number of reinforcing components can evenly distribute the force generated by the battery module, enhance the strength and stability of the battery box structure, and at the same time avoid increasing the installation difficulty and the overall weight of the battery pack by too many reinforcing components.

[0016] In some embodiments, the reinforcing member is a strip structure extending along the length of the housing 100.

[0017] The strip structure has good tensile strength along its length, which can stably withstand the lateral expansion force generated by the expansion of the battery module and maintain normal connection with the anti-expansion component.

[0018] In some embodiments, each reinforcing member is connected to two connectors at both ends, with the two connectors respectively connected to the side of the corresponding anti-expansion member away from the accommodating space.

[0019] Each reinforcing member is connected to two ends, which can restrict the expansion resistance on both sides, limit the excessive deformation of the expansion resistance on both sides, and maintain the relative stability of the battery box structure.

[0020] In some embodiments, the anti-expansion member is a plate-shaped structure, with one side of the anti-expansion member fixedly connected to the bottom wall of the box, and the end of the anti-expansion member fixedly connected to the side plate of the box along the width direction.

[0021] The plate structure has a large planar area, which can better distribute the force from the battery module, while also having a certain rigidity to resist the deformation caused by the expansion of the battery module.

[0022] In some embodiments, two anti-expansion members are disposed opposite each other inside the housing along the length direction and are spaced apart from the side plate of the housing along the length direction, with the connecting member located within the space.

[0023] The gap between the anti-expansion component and the side of the housing provides the necessary space for the deformation of the anti-expansion component, enabling it to absorb and dissipate some of the energy generated by the expansion of the battery module through elastic deformation.

[0024] In some embodiments, the two anti-expansion members and the two sides of the housing in the width direction form an accommodating space.

[0025] The enclosed space provides a stable support frame for the battery module, ensuring that the battery module can maintain a relatively fixed position within a normal range of volume changes, and guaranteeing the connection stability between the cells inside the battery module.

[0026] In some embodiments, the mounting groove extends to the top side of the anti-expansion member, and a portion of the mounting block protrudes from the top side of the anti-expansion member and connects to the end of the reinforcement member.

[0027] The mounting groove extends to the top side to facilitate the insertion of the mounting block from above, improving installation convenience; the top side of the mounting block extends and connects to the end of the reinforcement, allowing the reinforcement to cross over the top side of the anti-expansion component, increasing the contact area between the connection part and the inner wall of the mounting groove.

[0028] In some embodiments, the mounting block is detachably connected to the reinforcement.

[0029] The detachable connection method allows for easy adjustment of the position and angle of the mounting block, ensuring precise fit with the mounting slot and improving connection accuracy and stability; it also facilitates the maintenance and repair of the battery box.

[0030] In some embodiments, the mounting block and the end of the reinforcement are connected by bolts.

[0031] Bolted connections have high connection strength and can withstand large tensile and shear forces, ensuring that the mounting block and the reinforcing member will not loosen or separate over a long period of time; at the same time, they are easy to disassemble and maintain.

[0032] In some embodiments, the connector further includes a baffle connected to the mounting block, the baffle being located outside the mounting groove, and the baffle abutting against the side of the anti-expansion member opposite to the accommodating space.

[0033] The baffle enhances the stability of the connection between the mounting block and the anti-expansion component, and can limit the mounting block from moving further away from the accommodating space, thereby improving the overall structural reliability of the battery box.

[0034] In some embodiments, the connector further includes a pad, a portion of which is connected between the mounting block and the groove wall of the mounting groove, and another portion of which is connected between the baffle and the anti-expansion member.

[0035] The pad fills the gap between the mounting block and the mounting groove, preventing external dust, moisture and other impurities from entering the mounting groove and improving the reliability of the battery box; at the same time, it helps to evenly distribute the force generated by the expansion of the battery module.

[0036] Secondly, embodiments of this application provide a battery pack, including the aforementioned battery box; it also includes a battery module disposed in the accommodating space, with a reinforcing member contacting the top side of the battery module.

[0037] The battery box, through the synergistic effect of reinforcing components and anti-expansion components, achieves dual buffering against the expansion force of the battery module, effectively protecting the battery module and improving the overall safety and reliability of the battery pack.

[0038] The beneficial effects of the embodiments of this application are as follows:

[0039] In the embodiments of this application, when the anti-expansion member is subjected to expansion force and tends to deform outward, the reinforcing member has a limiting effect on the anti-expansion member through the connecting member. The two are mutually squeezed. Since the connecting member is set on the back of the anti-expansion member, the force exerted by the connecting member on the anti-expansion member in the direction of the accommodating space can be more evenly distributed to the entire anti-expansion member, thereby reducing the risk of structural damage due to excessive stress and improving the stability of the connection. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a perspective view of the battery box provided in an embodiment of this application;

[0042] Figure 2 This is a top view of the battery box provided in an embodiment of this application;

[0043] Figure 3 This is an embodiment of the present application. Figure 2 Schematic diagram of section AA;

[0044] Figure 4 This is an embodiment of the present application. Figure 3 A magnified view of a portion of point C in the middle;

[0045] Figure 5 This is an embodiment of the present application. Figure 3 Schematic diagram of the BB section;

[0046] Figure 6 This is an embodiment of the present application. Figure 5 A magnified view of a portion of point D in the middle;

[0047] In the diagram: 100, housing; 110, anti-expansion component; 111, mounting groove; 200, reinforcing component; 201, connecting component; 210, mounting block; 220, bolt; 213, baffle; 214, pad. Detailed Implementation

[0048] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0049] Currently, some battery boxes in related technologies employ anti-expansion structures, mainly composed of two anti-expansion beams and tie rods connecting these two beams. This structure can protect the battery module to a certain extent. When the battery module expands, the interaction between the components disperses and bears the expansion force, thus maintaining the overall structural stability of the battery box.

[0050] However, in this structure, stress concentration occurs at the connection between the tie rod and the anti-expansion beam, which may lead to the tie rod separating from the anti-expansion beam or the connection breaking, thereby threatening the safety and reliability of the battery system.

[0051] Regarding the above technical issues, firstly, refer to Figure 1 , Figure 2 , Figure 3 This application provides a battery box, including: a box body 100, with two anti-expansion members 110 disposed opposite to each other, and an accommodating space between the two anti-expansion members 110; at least one reinforcing member 200 connected between the two anti-expansion members 110; at least one end of the reinforcing member 200 is connected to a connecting member 201, and the connecting member 201 is fixedly connected to the side of the anti-expansion member 110 on its side away from the accommodating space.

[0052] Optionally, the connection between the connector 201 and the anti-expansion component 110 can be achieved by applying adhesive, bolting, or welding.

[0053] In this embodiment, during normal operation of the battery module, when the battery module expands and generates expansion force, this expansion force is directly transmitted to the anti-expansion members 110 located on both sides of the battery module's length. At this time, the anti-expansion members 110 on both sides absorb the battery's expansion force through their own elastic deformation, playing a certain buffering role. At the same time, since the reinforcing member 200 is connected between the two anti-expansion members 110 and contacts the top side of the battery module, the reinforcing member 200 also absorbs the battery's expansion force through its own elastic deformation, further mitigating the impact of the battery module's expansion. That is, the battery box achieves dual buffering of the battery module's expansion force through the synergistic effect of the anti-expansion members 110 and the reinforcing member 200.

[0054] Furthermore, when the anti-expansion member 110 is subjected to expansion force and tends to deform outward, the reinforcing member 200, through the connecting member 201, restricts the expansion of the member 110, and the two are mutually compressed. Since the connecting member 201 is located on the back of the anti-expansion member 110, the force exerted by the connecting member 201 on the expansion member 110 in the direction of the accommodating space can be more evenly distributed across the entire anti-expansion member 110, thereby reducing the risk of structural damage due to excessive stress and improving the stability of the connection.

[0055] In some embodiments, reference Figure 4 , Figure 6 The connector 201 includes a mounting block 210. The anti-expansion member 110 has a mounting groove 111 on the side away from the accommodating space. The corresponding mounting block 210 is inserted into and fixed with the mounting groove 111.

[0056] Optionally, after the mounting block 210 is inserted into the mounting groove 111, it can be fixed by applying glue, bolting, or welding.

[0057] In this embodiment, when assembling the battery box, the mounting blocks 210 at both ends of the reinforcing member 200 are aligned with the mounting grooves 111 on the anti-expansion member 110. The mounting blocks 210 and the mounting grooves 111 are tightly fitted by plugging them in. Through the relative squeezing action between the mounting blocks 210 and the mounting grooves 111, a stable connection between the reinforcing member 200 and the anti-expansion member 110 is achieved, which improves the installation efficiency and reduces the installation cost.

[0058] Furthermore, since the mounting groove 111 is located on the back of the anti-expansion member 110, the force exerted by the mounting block 210 on the mounting groove 111 is more easily transmitted to the entire anti-expansion member 110, rather than the mounting groove 111 itself restricting the mounting block 210, thus improving the connection stability.

[0059] In some embodiments, reference Figure 6The mounting groove 111 has a trapezoidal profile with a plane parallel to the bottom wall of the box 100 as the cross section, and the mounting block 210 has a trapezoidal surface that matches the trapezoidal profile.

[0060] In this embodiment, when the mounting blocks 210 at both ends of the reinforcing member 200 are inserted into the mounting grooves 111 on the anti-expansion member 110, the mounting blocks 210 fit together with the trapezoidal contour of the mounting grooves 111 by means of their trapezoidal surfaces, thereby achieving a reliable connection between the reinforcing member 200 and the anti-expansion member 110.

[0061] Furthermore, the trapezoidal surface design increases the contact area and friction between the mounting block 210 and the mounting groove 111, which can prevent the mounting block 210 from shaking or falling off in the mounting groove 111, thereby significantly enhancing the stability of the connection between the reinforcing member 200 and the anti-expansion member 110 and improving the overall reliability of the battery box structure.

[0062] In some embodiments, reference Figure 6 The trapezoidal profile includes a first side and a second side that are parallel to each other. The first side is shorter than the second side and is oriented toward the accommodating space.

[0063] In this embodiment, when the anti-expansion member 110 is subjected to expansion force and tends to deform outward, the mounting block 210, through the mounting groove 111, restricts the anti-expansion member 110, and the two are mutually compressed. Furthermore, due to the trapezoidal profile with its short side facing the accommodating space, i.e., the two inclined sides of the mounting block 210 gradually decrease towards the accommodating space, the force on the mounting block 210 within the mounting groove 111 is decomposed and transmitted along the inclined and short sides of the trapezoid, distributing more evenly to the anti-expansion member 110, thereby reducing the risk of structural damage due to excessive stress. Simultaneously, this force distribution also helps the mounting block 210 maintain a tight fit with the mounting groove 111, further improving the stability of the connection.

[0064] In some embodiments, reference Figure 1 , Figure 2 The number of reinforcing parts 200 is 1-6.

[0065] In this embodiment, setting multiple reinforcing members 200 can more evenly distribute the force generated by the battery module, enhancing the strength and stability of the entire battery box structure. However, too many reinforcing members 200 will increase the operation steps and difficulty during installation, reduce installation efficiency, and also increase the overall weight of the battery pack. Therefore, it needs to be limited to a suitable range.

[0066] In some embodiments, reference Figure 1 , Figure 2 The reinforcing member 200 is a strip structure extending along the length of the box body 100. For example, the reinforcing member 200 can be a strip-shaped I-beam structure.

[0067] In this embodiment, the reinforcing member 200 adopts a strip structure. Utilizing the mechanical properties of the strip structure in terms of its good tensile strength along its length, when the battery module expands and generates lateral expansion force, which is transmitted to the reinforcing member 200 and its two ends are stretched, it can stably withstand these forces, maintain normal connection with the anti-expansion member, and buffer the expansion force of the battery module, thus ensuring the stability of the overall structure of the battery box.

[0068] A strip-shaped I-beam structure is used as the reinforcing member 200, which has good mechanical properties in the height direction. During the expansion of the battery module, the reinforcing member 200 is subjected not only to tensile forces but also to forces that could cause it to bend. The I-beam structure can effectively disperse these forces, enhance the bending resistance of the reinforcing member 200 in the height direction, further improve the performance of the reinforcing member 200 against the expansion force of the battery module, and enhance the safety and reliability of the battery system.

[0069] In some embodiments, reference Figure 1 , Figure 2 Each reinforcing member 200 has a connector 201 at both ends, and the two connectors 201 are respectively connected to the side of the corresponding anti-expansion member 110 away from the accommodating space.

[0070] In this embodiment, each reinforcing member 200 is connected to a connecting member 201 at both ends, and the two connecting members 201 are respectively connected to the side of the corresponding anti-expansion member 110 away from the accommodating space, so that when the battery module expands, the reinforcing member 200 can restrict the anti-expansion members 110 on both sides.

[0071] Since the two ends of the reinforcing member 200 are connected to the anti-expansion members 110 on both sides through the connector 201, the reinforcing member 200 is a tie rod structure, which can restrict the anti-expansion members 110 on both sides, and can limit the excessive deformation of the anti-expansion members 110 on both sides, so that the entire battery box structure can remain relatively stable when the battery module expands.

[0072] In some embodiments, reference Figure 1 , Figure 2 The anti-expansion component 110 is a plate-shaped structure. One side of the anti-expansion component 110 is fixedly connected to the bottom wall of the box 100, and the end of the anti-expansion component 110 is fixedly connected to the side plate of the box 100 along the width direction.

[0073] Because the anti-expansion component 110 is a plate-shaped structure, it has a large planar area. When subjected to lateral expansion force, the large planar surface of the plate-shaped structure can better cooperate with the mounting groove 111, dispersing the force from the battery module more widely. At the same time, in the direction perpendicular to the plate surface, the plate-shaped structure has a certain rigidity, which can resist the deformation tendency caused by the expansion of the battery module and maintain the relative stability of its own structure.

[0074] The plate structure has multiple hollow buffer cavities inside. When lateral expansion force is transmitted to the anti-expansion component 110, these hollow buffer cavities can deform to a certain extent. During the deformation process, the hollow buffer cavities can absorb and consume part of the expansion force, converting and dispersing the energy of the force, thereby further reducing the force borne by the anti-expansion component 110 and reducing the risk of damage due to excessive force.

[0075] In some embodiments, reference Figure 1 , Figure 2 Two anti-expansion members 110 are disposed opposite each other inside the housing 100 along the length direction and are spaced apart from the side plate of the housing along the length direction, and the connector 201 is located within the space.

[0076] In this embodiment, during the assembly of the battery box, the connector needs to be accurately installed on the side of the anti-expansion component 110 away from the accommodating space to achieve a stable connection and force transmission. By setting a gap between the anti-expansion component 110 and the side of the box, installation space is provided for the connector 201 used to connect the reinforcing component 200 and the anti-expansion component 110. Simultaneously, when the battery module expands, the anti-expansion component 110 will be subjected to a large lateral force and tend to deform. The reserved gap provides the necessary space for the deformation of the anti-expansion component 110. The anti-expansion component 110 can undergo a certain degree of elastic deformation within this space, absorbing and dissipating some of the energy generated by the expansion of the battery module through its own deformation.

[0077] In some embodiments, reference Figure 1 , Figure 2 The two anti-expansion components 110 and the two sides of the box body 100 in the width direction form an accommodating space.

[0078] In this embodiment, the two side edges of the housing 100 in the width direction serve as the other two boundaries of the accommodating space, cooperating with the anti-expansion member 110 to provide a foundation for the installation and fixation of the anti-expansion member 110. The accommodating space enclosed by the two anti-expansion members 110 and the side edges of the housing provides a stable support frame for the battery module, ensuring that the battery module can maintain a relatively fixed position within the normal volume change range and guaranteeing the connection stability between the cells inside the battery module.

[0079] In some embodiments, reference Figure 4 The mounting groove 111 extends to the top side of the anti-expansion member 110, and a portion of the mounting block 210 extends out from the top side of the anti-expansion member 110 and connects to the end of the reinforcement member 200.

[0080] In this embodiment, when assembling the battery box, the mounting block 210 needs to be embedded into the mounting groove 111 on the anti-expansion member 110. Since the mounting groove 111 extends to the top side, the mounting block 210 can be easily inserted into the mounting groove 111 from above. The top side of the mounting block 210 extends and connects to the end of the reinforcing member 200, allowing the reinforcing member 200 to extend across the top side of the anti-expansion member 110. This ensures that after the mounting block 210 is embedded in the mounting groove 111, a larger portion of it can make close contact with the inner wall of the mounting groove 111.

[0081] In some embodiments, reference Figure 4 The mounting block 210 and the reinforcing member 200 are detachably connected.

[0082] In this embodiment, during battery box assembly, since the mounting block 210 and the reinforcing member 200 are detachable, the operator can first independently install the mounting block 210 into the mounting groove 111 of the anti-expansion member 110. This facilitates adjustment of the position and angle of the mounting block 210, ensuring precise alignment with the mounting groove 111, thereby guaranteeing a high degree of connection accuracy and stability between the mounting block 210 and the anti-expansion member 110. After the mounting block 210 is installed in place on the anti-expansion member 110, the connection operation between the reinforcing member 200 and the mounting block 210 is then performed. The detachable connection method provides sufficient space and operational convenience for connecting the reinforcing member 200, ensuring connection quality.

[0083] In some embodiments, reference Figure 4 The mounting block 210 and the end of the reinforcing member 200 are connected by bolts 220.

[0084] In this embodiment, the bolted connection has high connection strength and can withstand large tensile and shear forces. This ensures that the mounting block 210 and the reinforcing member 200 will not loosen or separate under long-term exposure to these forces. Furthermore, when maintenance or repair of the battery box is required, the reinforcing member 200 can be removed from the mounting block 210 simply by using appropriate tools to unscrew the bolts 220, saving maintenance time and costs.

[0085] In some embodiments, reference Figure 4 , Figure 6 The connector 201 also includes a baffle 213, which is connected to the mounting block 210. The baffle 213 is located outside the mounting groove 111 and abuts against the side of the anti-expansion member 110 away from the accommodating space.

[0086] In this embodiment, when the mounting block 210 is embedded into the mounting groove 111 on the anti-expansion member 110, the baffle 213 moves closer to the side of the anti-expansion member 110 away from the receiving space as the mounting block 210 approaches it. When the mounting block 210 is installed in the mounting groove 111, the baffle 213 is in close contact with this side of the anti-expansion member 110, enhancing the stability of the connection between the mounting block 210 and the anti-expansion member 110. Under conditions such as battery module expansion, the force generated by the battery module is transmitted to the mounting groove 111 and the mounting block 210 through the anti-expansion member 110. At this time, the baffle 213 increases the contact area between the mounting block and the anti-expansion member 110, which can limit the mounting block 210 from moving further away from the receiving space.

[0087] In some embodiments, reference Figure 4 , Figure 6 The connector 201 also includes a pad 214, a part of which is connected between the mounting block 210 and the groove wall of the mounting groove 111, and another part of which is connected between the baffle 213 and the anti-expansion member 110.

[0088] In this embodiment, during the actual installation process, gaps inevitably exist between the mounting block 210 and the mounting groove 111, and between the baffle 213 and the anti-expansion component 110. The pad 214 covers the contact surface between the two, which can fill these gaps and prevent external dust, moisture and other impurities from entering the mounting groove 111, thereby improving the reliability of the battery box.

[0089] Furthermore, the filling of the pad 214 makes the contact between the mounting block 210 and the mounting groove 111 tighter and more stable. When subjected to the force generated by the expansion of the battery module, the pad 214 can help to evenly distribute these forces.

[0090] Secondly, embodiments of this application provide a battery pack, including the aforementioned battery box; it also includes a battery module disposed in the accommodating space, with the reinforcing member 200 contacting the top side of the battery module. The battery pack has the same technical effects as the aforementioned battery box, and will not be described again.

[0091] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery box, characterized in that, include: The housing (100) is provided with two anti-expansion members (110) arranged opposite to each other, and an accommodating space is provided between the two anti-expansion members (110); At least one reinforcing member (200) is connected between the two anti-expansion members (110); At least one end of the reinforcing member (200) is connected to a connector (201), and the connector (201) is fixedly connected to the side of the anti-expansion member (110) on the side away from the accommodating space.

2. The battery box according to claim 1, characterized in that, The connector (201) includes a mounting block (210), and the anti-expansion member (110) is provided with a mounting groove (111) on the side away from the accommodating space. The mounting block (210) is inserted into and fixed with the mounting groove (111).

3. The battery box according to claim 2, characterized in that, With the plane parallel to the bottom wall of the box (100) as the cross section, the cross section of the mounting groove (111) is a trapezoidal outline, and the cross section of the mounting block (210) is a trapezoidal surface adapted to the trapezoidal outline.

4. The battery box according to claim 3, characterized in that, The trapezoidal profile includes a first side and a second side that are parallel to each other. The first side is shorter than the second side and is oriented toward the accommodating space. The trapezoidal surface is adapted to the trapezoidal profile.

5. The battery box according to any one of claims 1 to 4, characterized in that, The number of the reinforcing members (200) is 1-6.

6. The battery box according to any one of claims 1 to 4, characterized in that, The reinforcing member (200) is a strip structure extending along the length of the box body (100).

7. The battery box according to any one of claims 1 to 4, characterized in that, Each of the reinforcing members (200) has a connector (201) at both ends, and the two connectors (201) are respectively connected to the side of the anti-expansion member (110) away from the accommodating space.

8. The battery box according to any one of claims 1 to 4, characterized in that, The anti-expansion component (110) is a plate structure. One side of the anti-expansion component (110) is fixedly connected to the bottom wall of the box (100). The end of the anti-expansion component (110) is fixedly connected to the side plate of the box (100) along the width direction.

9. The battery box according to claim 8, characterized in that, Two anti-expansion members (110) are disposed opposite each other inside the housing (100) along the length direction and are spaced apart from the side plate of the housing (100) along the length direction, and the connector (201) is located within the space.

10. The battery box according to any one of claims 2-4, characterized in that, The mounting groove (111) extends to the top side of the anti-expansion member (110), and a portion of the mounting block (210) extends out from the top side of the anti-expansion member (110) and connects to the end of the reinforcement member (200).

11. The battery box according to claim 10, characterized in that, The mounting block (210) is detachably connected to the reinforcing member (200).

12. The battery box according to claim 11, characterized in that, The mounting block (210) is connected to the end of the reinforcing member (200) by bolts (220).

13. The battery box according to any one of claims 2-4, characterized in that, The connector (201) further includes a baffle (213), which is connected to the mounting block (210). The baffle (213) is located outside the mounting groove (111) and abuts against the side of the anti-expansion member (110) away from the accommodating space.

14. The battery box according to claim 13, characterized in that, The connector (201) also includes a pad (214), a portion of which is connected between the mounting block (210) and the groove wall of the mounting groove (111), and another portion of which is connected between the baffle (213) and the anti-expansion member (110).

15. A battery pack, characterized in that, It includes a battery box as described in any one of claims 1-14; it also includes a battery module disposed in the accommodating space, wherein the reinforcing member (200) contacts the top side of the battery module.

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