Lower box body, battery box body, battery pack and electric equipment

Abstract

The utility model belongs to the field of secondary batteries, and particularly relates to a lower box body, a battery box body, a battery pack and electric equipment. The utility model provides a lower box body in order to prevent a structure mutation part of an interlayer supporting piece from being broken in the using process of a battery pack. The lower box body comprises interlayer supporting pieces, longitudinal reinforcing beams are arranged on the interlayer supporting pieces, a bottom layer supporting rod is further arranged between the lowest interlayer supporting piece and the bottom supporting piece, and the two ends of the bottom layer supporting rod are fixedly connected to the longitudinal reinforcing beams of the bottom supporting piece and the lowest interlayer supporting piece respectively; an interlayer supporting rod is arranged between the longitudinal reinforcing beams of every two adjacent interlayer supporting pieces, and the two ends of each interlayer supporting rod are fixedly connected with the longitudinal reinforcing beams of every two adjacent interlayer supporting pieces respectively. The utility model further provides a battery box body comprising the lower box body, a battery pack and electric equipment. The stress borne by the structure sudden change part is reduced through the longitudinal reinforcing beams and the supporting rods, and therefore the structure sudden change part is prevented from being broken.

Description

Technical Field

[0001] The utility model belongs to the field of secondary batteries, and in particular relates to a lower box, a battery box, a battery pack and electrical equipment. Background Art

[0002] As a typical battery pack structure, it includes a battery box and a battery module installed in the battery box, such as Figure 1 As shown, a small module 2 and a large module 1 are installed in the battery box at the same time. The arrangement direction of each layer of battery modules is defined as left and right. The length of the small module 2 in the front-to-back direction is smaller than the length of the large module 1 in the front-to-back direction. The rear end of the small module 2 is flush with the rear end of the large module 1, and structures such as the battery management system are arranged in front of the small module 2.

[0003] like Figure 1-2 As shown, when assembling a battery pack, first, a layer of battery modules is hoisted into the lower case. Next, an interlayer support member 3 is hoisted into the lower case and secured to the lower case. This process is repeated until all battery modules are hoisted into the lower case. The bottommost battery module is placed on the bottom support member of the lower case. A predetermined gap exists between the bottom surface of the interlayer support member 3 and the upper surface of the battery module immediately below it to ensure electrical safety.

[0004] However, in the above battery pack, if Figure 1-2 As shown, the interlayer support member 3 has both a longitudinal long beam 33 corresponding to the large module 1 and a longitudinal short beam 31 corresponding to the small module 2. In the front-to-back direction, the rear ends of the longitudinal long beam 33 and the longitudinal short beam 31 are both connected to the rear crossbeam, the front end of the longitudinal long beam 33 is connected to the large module support crossbeam 392, and the front end of the longitudinal short beam 31 is connected to the small module support crossbeam 391. The large module support crossbeam 392 and the small module support crossbeam 391 are fixedly connected by a connector 32. The connection between the large module support crossbeam 392, the small module support crossbeam 391 and the connector 32 constitutes a structural mutation. During the use of the battery pack, when the battery pack shakes, the stress on the structural mutation is relatively concentrated, making it easy to break. Utility Model Content

[0005] The purpose of the present utility model is to provide a lower box body to solve the technical problem in the prior art that the structural mutation portion of the interlayer support member of the battery pack is easily broken.

[0006] The purpose of the present invention is also to provide a battery box to solve the same technical problem as above.

[0007] The purpose of the present invention is also to provide a battery pack to solve the same technical problem as above.

[0008] The purpose of the present invention is to provide an electrical device to solve the above-mentioned technical problems.

[0009] In order to achieve the above-mentioned purpose, the technical solution of the lower box provided by the utility model is:

[0010] A lower box body comprises a box body and at least one interlayer support member fixedly mounted on the box body, the interlayer support member comprises a large module support beam, a small module support beam and a common support beam, a longitudinal long beam for supporting the large module is provided between the large module support beam and the common support beam, a longitudinal short beam for supporting the small module is provided between the small module support beam and the common support beam, the large module support beam and the small module support beam are connected by a connector, and the connection between the large module support beam, the small module support beam and the connector constitutes a structural mutation part A longitudinal reinforcement beam is provided on the interlayer support member. When the lower box body is in use, the longitudinal reinforcement beam is located between the large module and the small module. A bottom support rod is also provided between the lowest interlayer support member and the bottom support member of the box body. The two ends of the bottom support rod are respectively fixedly connected to the longitudinal reinforcement beams of the bottom support member and the lowest interlayer support member; when the number of interlayer support members is at least two, an interlayer support rod is provided between the longitudinal reinforcement beams of adjacent interlayer support members, and the two ends of the interlayer support rod are respectively fixedly connected to the longitudinal reinforcement beams of the two adjacent interlayer support members.

[0011] Furthermore, a large and small module connecting piece is fixedly installed at the bottom of at least one structural mutation part, and the large and small module connecting piece is provided with a large module connecting through hole and a small module connecting through hole for fasteners to pass through when in use to fix the adjacent large modules and small modules to the large and small module connecting piece respectively.

[0012] Furthermore, at least one large and small module connector constitutes a supporting connector, and the bottom of the supporting connector is also fixedly connected to a supporting connector support rod, the lower end of the supporting connector support rod is fixed on the bottom support member or the longitudinal reinforcement beam, the supporting connector has a structural mutation support surface for supporting the structural mutation part, the supporting connector support rod has a supporting connector support surface for supporting the supporting connector, and the area of ​​the structural mutation support surface is larger than the area of ​​the supporting connector support surface.

[0013] Furthermore, the extension direction of the longitudinal reinforcement beam is defined as the front-to-back direction, there are at least two interlayer support rods, and the setting positions of the interlayer support rods satisfy L2=nL1=nL3, where: L1 is the distance between the interlayer support rod at the rear end and the common support beam, L2 is the distance between the interlayer support rod at the front end and the interlayer support rod at the rear end, L3 is the distance between the interlayer support rod at the front end and the large module support beam, and 2.5≤n≤3.

[0014] Furthermore, each interlayer support member is provided with a through-hole, and each support rod includes a hollow large-diameter section and a small-diameter threaded section at both ends of the hollow large-diameter section. The small-diameter threaded section at the lower end of each support rod is threadedly connected to the bottom support member or the corresponding interlayer support member, and the small-diameter threaded section at the upper end of each support rod is connected with a nut after passing through the through-hole on the corresponding layer support frame. The upper end surface of the hollow large-diameter section constitutes a support surface for supporting the corresponding interlayer support member.

[0015] Furthermore, the supporting connector is provided with a through-hole, and each supporting connector support rod includes a hollow large-diameter section and a small-diameter threaded section at both ends of the hollow large-diameter section. The small-diameter threaded section at the lower end of each supporting connector support rod is respectively threadedly connected to the bottom support member or the corresponding interlayer support member, and the small-diameter threaded section at the upper end of each supporting connector support rod is connected with a nut after passing through the through-hole on the corresponding supporting connector, and the upper end surface of the hollow large-diameter section constitutes the supporting surface of the supporting connector.

[0016] Furthermore, one end of the longitudinal reinforcement beam is connected to the structural mutation portion.

[0017] Furthermore, the extension direction of the longitudinal reinforcement beam is defined as the front-to-back direction, and a front connecting member and a rear connecting member are fixedly installed at the bottom of the interlayer support member. The front connecting member is provided with a front module connecting through-hole for allowing a fastener to pass through when in use to fix the front ends of adjacent battery modules to the front connecting member respectively; the rear connecting member is provided with a rear module connecting through-hole for allowing a fastener to pass through when in use to fix the rear ends of adjacent battery modules to the rear connecting member respectively.

[0018] Furthermore, at least one front connecting member is arranged at the bottom of the structural mutation part and constitutes a large and small module connecting member. The front module connecting through hole on the large and small module connecting member is used for fasteners to pass through when in use to fix the adjacent large modules and small modules to the large and small module connecting members respectively.

[0019] Furthermore, at least one large and small module connector constitutes a supporting connector, and the bottom of the supporting connector is also fixedly connected to a supporting connector support rod, the lower end of the supporting connector support rod is fixed on the bottom support member or the longitudinal reinforcement beam, the supporting connector has a structural mutation support surface for supporting the structural mutation part, the supporting connector support rod has a supporting connector support surface for supporting the supporting connector, and the area of ​​the structural mutation support surface is larger than the area of ​​the supporting connector support surface.

[0020] Furthermore, the support connector includes an L-shaped part, a gantry part and a "7"-shaped part. The L-shaped part includes a horizontal plate and a vertical plate. The junction of the horizontal plate and the vertical plate is fixedly connected to the support rod of the support connector. The large module connection through-hole is arranged at the end of the horizontal plate away from the vertical plate, and the small module connection through-hole is arranged at the end of the vertical plate away from the horizontal plate; the gantry part is arranged in the middle of the horizontal plate, and the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box is connected to a longitudinally extending support plate, and a reinforcing beam is arranged between the support plate and the two vertical plates, and the reinforcing beam and the support plate constitute a "7"-shaped part; the upper plate surface of the support plate constitutes the support surface of the support connector; the end of the horizontal plate and the vertical plate away from the gantry part is provided with an upward-folded vertical folding edge; both the support plate and the connecting plate are provided with mounting holes for connecting to the interlayer support members.

[0021] Furthermore, the rear connecting member includes a horizontal plate and a gantry part. The horizontal plate is provided with an upward-folded vertical folded edge at one end close to the lower box body, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates, and the connecting plate is provided with mounting holes for connecting to the interlayer support members; the rear module connection through holes are arranged at both ends of the horizontal plate.

[0022] Furthermore, at least one front connecting member is arranged at the bottom of the structural mutation part and constitutes a front large module connecting member. The front module connecting through hole on the front large module connecting member is used for fasteners to pass through when in use to fix the adjacent two large modules to the front large module connecting member respectively.

[0023] Furthermore, the front large module connecting part includes a horizontal plate, a gantry part and a "7"-shaped part. The end of the horizontal plate close to the lower box body is provided with an upward-folded vertical folded edge, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box body is connected to a longitudinally extending support plate, and a reinforcing beam is provided between the support plate and the two vertical plates, and the reinforcing beam and the support plate constitute a "7"-shaped part; both the support plate and the connecting plate are provided with mounting holes for connecting to the interlayer support members, and the front module connection through holes are arranged at both ends of the horizontal plate.

[0024] The beneficial effects of the lower box provided by the present invention are as follows: the present invention is an improved invention. The longitudinal reinforcement beams arranged between adjacent longitudinal long beams and longitudinal short beams can initially strengthen the structural strength of the interlayer support members and reduce the stress on the structural mutation part; the bottom layer support members are fixedly connected to the bottom support members of the box body by the bottom support rods, and the adjacent interlayer support members are fixedly connected by the interlayer support rods, and each support rod is fixedly connected to the longitudinal reinforcement beams, so that the support rods can indirectly support the structural mutation part through the longitudinal reinforcement beams, thereby improving the overall structural strength of the lower box, reducing the stress on the structural mutation part, and avoiding the fracture of the structural mutation part.

[0025] To achieve the above objectives, the technical solution of the battery box provided by the present invention is:

[0026] A battery box, comprising a lower box and a box cover, wherein the lower box comprises a box body and at least one interlayer support member fixedly mounted on the box body, wherein the interlayer support member comprises a large module support beam, a small module support beam and a common support beam, a longitudinal long beam for supporting the large module is provided between the large module support beam and the common support beam, a longitudinal short beam for supporting the small module is provided between the small module support beam and the common support beam, the large module support beam and the small module support beam are connected by a connecting member, and the connection between the large module support beam, the small module support beam and the connecting member is formed The structure forms a sudden change part, and a longitudinal reinforcement beam is provided on the interlayer support member. When the lower box body is in use, the longitudinal reinforcement beam is located between the large module and the small module. A bottom support rod is also provided between the lowest interlayer support member and the bottom support member of the box body, and the two ends of the bottom support rod are respectively fixedly connected to the longitudinal reinforcement beams of the bottom support member and the lowest interlayer support member; when the number of interlayer support members is at least two, an interlayer support rod is provided between the longitudinal reinforcement beams of adjacent interlayer support members, and the two ends of the interlayer support rod are respectively fixedly connected to the longitudinal reinforcement beams of the two adjacent interlayer support members.

[0027] Furthermore, a large and small module connecting piece is fixedly installed at the bottom of at least one structural mutation part, and the large and small module connecting piece is provided with a large module connecting through hole and a small module connecting through hole for fasteners to pass through when in use to fix the adjacent large modules and small modules to the large and small module connecting piece respectively.

[0028] Furthermore, at least one large and small module connector constitutes a supporting connector, and the bottom of the supporting connector is also fixedly connected to a supporting connector support rod, the lower end of the supporting connector support rod is fixed on the bottom support member or the longitudinal reinforcement beam, the supporting connector has a structural mutation support surface for supporting the structural mutation part, the supporting connector support rod has a supporting connector support surface for supporting the supporting connector, and the area of ​​the structural mutation support surface is larger than the area of ​​the supporting connector support surface.

[0029] Furthermore, the extension direction of the longitudinal reinforcement beam is defined as the front-to-back direction, there are at least two interlayer support rods, and the setting positions of the interlayer support rods satisfy L2=nL1=nL3, where: L1 is the distance between the interlayer support rod at the rear end and the common support beam, L2 is the distance between the interlayer support rod at the front end and the interlayer support rod at the rear end, L3 is the distance between the interlayer support rod at the front end and the large module support beam, and 2.5≤n≤3.

[0030] Furthermore, each interlayer support member is provided with a through-hole, and each support rod includes a hollow large-diameter section and a small-diameter threaded section at both ends of the hollow large-diameter section. The small-diameter threaded section at the lower end of each support rod is threadedly connected to the bottom support member or the corresponding interlayer support member, and the small-diameter threaded section at the upper end of each support rod is connected with a nut after passing through the through-hole on the corresponding layer support frame. The upper end surface of the hollow large-diameter section constitutes a support surface for supporting the corresponding interlayer support member.

[0031] Furthermore, the supporting connector is provided with a through-hole, and each supporting connector support rod includes a hollow large-diameter section and a small-diameter threaded section at both ends of the hollow large-diameter section. The small-diameter threaded section at the lower end of each supporting connector support rod is respectively threadedly connected to the bottom support member or the corresponding interlayer support member, and the small-diameter threaded section at the upper end of each supporting connector support rod is connected with a nut after passing through the through-hole on the corresponding supporting connector, and the upper end surface of the hollow large-diameter section constitutes the supporting surface of the supporting connector.

[0032] Furthermore, one end of the longitudinal reinforcement beam is connected to the structural mutation portion.

[0033] Furthermore, the extension direction of the longitudinal reinforcement beam is defined as the front-to-back direction, and a front connecting member and a rear connecting member are fixedly installed at the bottom of the interlayer support member. The front connecting member is provided with a front module connecting through-hole for allowing a fastener to pass through when in use to fix the front ends of adjacent battery modules to the front connecting member respectively; the rear connecting member is provided with a rear module connecting through-hole for allowing a fastener to pass through when in use to fix the rear ends of adjacent battery modules to the rear connecting member respectively.

[0034] Furthermore, at least one front connecting member is arranged at the bottom of the structural mutation part and constitutes a large and small module connecting member. The front module connecting through hole on the large and small module connecting member is used for fasteners to pass through when in use to fix the adjacent large modules and small modules to the large and small module connecting members respectively.

[0035] Furthermore, at least one large and small module connector constitutes a supporting connector, and the bottom of the supporting connector is also fixedly connected to a supporting connector support rod, the lower end of the supporting connector support rod is fixed on the bottom support member or the longitudinal reinforcement beam, the supporting connector has a structural mutation support surface for supporting the structural mutation part, the supporting connector support rod has a supporting connector support surface for supporting the supporting connector, and the area of ​​the structural mutation support surface is larger than the area of ​​the supporting connector support surface.

[0036] Furthermore, the support connector includes an L-shaped part, a gantry part and a "7"-shaped part. The L-shaped part includes a horizontal plate and a vertical plate. The junction of the horizontal plate and the vertical plate is fixedly connected to the support rod of the support connector. The large module connection through-hole is arranged at the end of the horizontal plate away from the vertical plate, and the small module connection through-hole is arranged at the end of the vertical plate away from the horizontal plate; the gantry part is arranged in the middle of the horizontal plate, and the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box is connected to a longitudinally extending support plate, and a reinforcing beam is arranged between the support plate and the two vertical plates, and the reinforcing beam and the support plate constitute a "7"-shaped part; the upper plate surface of the support plate constitutes the support surface of the support connector; the end of the horizontal plate and the vertical plate away from the gantry part is provided with an upward-folded vertical folding edge; both the support plate and the connecting plate are provided with mounting holes for connecting to the interlayer support members.

[0037] Furthermore, the rear connecting member includes a horizontal plate and a gantry part. The horizontal plate is provided with an upward-folded vertical folded edge at one end close to the lower box body, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates, and the connecting plate is provided with mounting holes for connecting to the interlayer support members; the rear module connection through holes are arranged at both ends of the horizontal plate.

[0038] Furthermore, at least one front connecting member is arranged at the bottom of the structural mutation part and constitutes a front large module connecting member. The front module connecting through hole on the front large module connecting member is used for fasteners to pass through when in use to fix the adjacent two large modules to the front large module connecting member respectively.

[0039] Furthermore, the front large module connecting part includes a horizontal plate, a gantry part and a "7"-shaped part. The end of the horizontal plate close to the lower box body is provided with an upward-folded vertical folded edge, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box body is connected to a longitudinally extending support plate, and a reinforcing beam is provided between the support plate and the two vertical plates, and the reinforcing beam and the support plate constitute a "7"-shaped part; both the support plate and the connecting plate are provided with mounting holes for connecting to the interlayer support members, and the front module connection through holes are arranged at both ends of the horizontal plate.

[0040] The battery box provided by the present invention has the following beneficial effects: the present invention is an improved invention. In the battery box, the longitudinal reinforcement beams arranged between adjacent longitudinal long beams and longitudinal short beams can initially strengthen the structural strength of the interlayer support members and reduce the stress on the structural mutation part; the bottom layer support members are fixedly connected to the bottom support members of the box body by the bottom support rods, and the adjacent interlayer support members are fixedly connected by the interlayer support rods, and each support rod is fixedly connected to the longitudinal reinforcement beams, so that the support rods can indirectly support the structural mutation part through the longitudinal reinforcement beams, thereby improving the overall structural strength of the lower box body, reducing the stress on the structural mutation part, and avoiding the fracture of the structural mutation part.

[0041] To achieve the above objectives, the technical solution of the battery pack provided by the present invention is:

[0042] A battery pack comprises a battery box and a battery module installed in the battery box, the battery box comprises a lower box and a box cover, the lower box comprises a box body and at least one interlayer support member fixedly mounted on the box body, the interlayer support member comprises a large module support beam, a small module support beam and a common support beam, a longitudinal long beam for supporting the large module is provided between the large module support beam and the common support beam, a longitudinal short beam for supporting the small module is provided between the small module support beam and the common support beam, the large module support beam and the small module support beam are connected by a connector, and the large module support beam and the small module support beam are connected by a connector. The connection between the supporting crossbeam and the connecting piece constitutes a structural mutation part. A longitudinal reinforcement beam is provided on the interlayer support piece. When the lower box body is in use, the longitudinal reinforcement beam is located between the large module and the small module. A bottom support rod is also provided between the lowest interlayer support piece and the bottom support piece of the box body. The two ends of the bottom support rod are respectively fixedly connected to the longitudinal reinforcement beams of the bottom support piece and the lowest interlayer support piece; when the number of interlayer support pieces is at least two, an interlayer support rod is provided between the longitudinal reinforcement beams of adjacent interlayer support pieces, and the two ends of the interlayer support rod are respectively fixedly connected to the longitudinal reinforcement beams of the two adjacent interlayer support pieces.

[0043] Furthermore, a large and small module connecting piece is fixedly installed at the bottom of at least one structural mutation part, and the large and small module connecting piece is provided with a large module connecting through hole and a small module connecting through hole for fasteners to pass through when in use to fix the adjacent large modules and small modules to the large and small module connecting piece respectively.

[0044] Furthermore, at least one large and small module connector constitutes a supporting connector, and the bottom of the supporting connector is also fixedly connected to a supporting connector support rod, the lower end of the supporting connector support rod is fixed on the bottom support member or the longitudinal reinforcement beam, the supporting connector has a structural mutation support surface for supporting the structural mutation part, the supporting connector support rod has a supporting connector support surface for supporting the supporting connector, and the area of ​​the structural mutation support surface is larger than the area of ​​the supporting connector support surface.

[0045] Furthermore, the extension direction of the longitudinal reinforcement beam is defined as the front-to-back direction, there are at least two interlayer support rods, and the setting positions of the interlayer support rods satisfy L2=nL1=nL3, where: L1 is the distance between the interlayer support rod at the rear end and the common support beam, L2 is the distance between the interlayer support rod at the front end and the interlayer support rod at the rear end, L3 is the distance between the interlayer support rod at the front end and the large module support beam, and 2.5≤n≤3.

[0046] Furthermore, each interlayer support member is provided with a through-hole, and each support rod includes a hollow large-diameter section and a small-diameter threaded section at both ends of the hollow large-diameter section. The small-diameter threaded section at the lower end of each support rod is threadedly connected to the bottom support member or the corresponding interlayer support member, and the small-diameter threaded section at the upper end of each support rod is connected with a nut after passing through the through-hole on the corresponding layer support frame. The upper end surface of the hollow large-diameter section constitutes a support surface for supporting the corresponding interlayer support member.

[0047] Furthermore, the supporting connector is provided with a through-hole, and each supporting connector support rod includes a hollow large-diameter section and a small-diameter threaded section at both ends of the hollow large-diameter section. The small-diameter threaded section at the lower end of each supporting connector support rod is respectively threadedly connected to the bottom support member or the corresponding interlayer support member, and the small-diameter threaded section at the upper end of each supporting connector support rod is connected with a nut after passing through the through-hole on the corresponding supporting connector, and the upper end surface of the hollow large-diameter section constitutes the supporting surface of the supporting connector.

[0048] Furthermore, one end of the longitudinal reinforcement beam is connected to the structural mutation portion.

[0049] Furthermore, the extension direction of the longitudinal reinforcement beam is defined as the front-to-back direction, and a front connecting member and a rear connecting member are fixedly installed at the bottom of the interlayer support member. The front connecting member is provided with a front module connecting through-hole for allowing a fastener to pass through when in use to fix the front ends of adjacent battery modules to the front connecting member respectively; the rear connecting member is provided with a rear module connecting through-hole for allowing a fastener to pass through when in use to fix the rear ends of adjacent battery modules to the rear connecting member respectively.

[0050] Furthermore, at least one front connecting member is arranged at the bottom of the structural mutation part and constitutes a large and small module connecting member. The front module connecting through hole on the large and small module connecting member is used for fasteners to pass through when in use to fix the adjacent large modules and small modules to the large and small module connecting members respectively.

[0051] Furthermore, at least one large and small module connector constitutes a supporting connector, and the bottom of the supporting connector is also fixedly connected to a supporting connector support rod, the lower end of the supporting connector support rod is fixed on the bottom support member or the longitudinal reinforcement beam, the supporting connector has a structural mutation support surface for supporting the structural mutation part, the supporting connector support rod has a supporting connector support surface for supporting the supporting connector, and the area of ​​the structural mutation support surface is larger than the area of ​​the supporting connector support surface.

[0052] Furthermore, the support connector includes an L-shaped part, a gantry part and a "7"-shaped part. The L-shaped part includes a horizontal plate and a vertical plate. The junction of the horizontal plate and the vertical plate is fixedly connected to the support rod of the support connector. The large module connection through-hole is arranged at the end of the horizontal plate away from the vertical plate, and the small module connection through-hole is arranged at the end of the vertical plate away from the horizontal plate; the gantry part is arranged in the middle of the horizontal plate, and the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box is connected to a longitudinally extending support plate, and a reinforcing beam is arranged between the support plate and the two vertical plates, and the reinforcing beam and the support plate constitute a "7"-shaped part; the upper plate surface of the support plate constitutes the support surface of the support connector; the end of the horizontal plate and the vertical plate away from the gantry part is provided with an upward-folded vertical folding edge; both the support plate and the connecting plate are provided with mounting holes for connecting to the interlayer support members.

[0053] Furthermore, the rear connecting member includes a horizontal plate and a gantry part. The horizontal plate is provided with an upward-folded vertical folded edge at one end close to the lower box body, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates, and the connecting plate is provided with mounting holes for connecting to the interlayer support members; the rear module connection through holes are arranged at both ends of the horizontal plate.

[0054] Furthermore, at least one front connecting member is arranged at the bottom of the structural mutation part and constitutes a front large module connecting member. The front module connecting through hole on the front large module connecting member is used for fasteners to pass through when in use to fix the adjacent two large modules to the front large module connecting member respectively.

[0055] Furthermore, the front large module connecting part includes a horizontal plate, a gantry part and a "7"-shaped part. The end of the horizontal plate close to the lower box body is provided with an upward-folded vertical folded edge, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box body is connected to a longitudinally extending support plate, and a reinforcing beam is provided between the support plate and the two vertical plates, and the reinforcing beam and the support plate constitute a "7"-shaped part; both the support plate and the connecting plate are provided with mounting holes for connecting to the interlayer support members, and the front module connection through holes are arranged at both ends of the horizontal plate.

[0056] Furthermore, the top-layer battery modules are fixedly connected via top-layer connectors.

[0057] The beneficial effects of the battery pack provided by the present invention are as follows: the present invention is an improved invention. The longitudinal reinforcing beams provided between adjacent longitudinal long beams and longitudinal short beams can preliminarily strengthen the structural strength of the interlayer support members and reduce the stress on the structural mutation part; the bottom layer support rods are used to fix the lowest interlayer support member with the bottom support member of the box body, and the interlayer support rods are used to fix the adjacent interlayer support members, and each support rod is fixedly connected to the longitudinal reinforcing beams, so that the support rods can indirectly support the structural mutation part through the longitudinal reinforcing beams, thereby improving the overall structural strength of the lower box body, reducing the stress on the structural mutation part, and avoiding the fracture of the structural mutation part. When the battery pack shakes, the support rods and the longitudinal reinforcing beams can effectively reduce the deformation of the structural mutation part, that is, reduce the stress on the structural mutation part, and avoid the fracture of the structural mutation part.

[0058] To achieve the above-mentioned purpose, the technical solution of the electrical equipment provided by the present utility model is:

[0059] An electrical device includes a battery pack, the battery pack includes a battery box and a battery module installed in the battery box, the battery box includes a lower box and a box cover, the lower box includes a box body and at least one interlayer support member fixedly installed on the box body, the interlayer support member has a large module support beam, a small module support beam and a common support beam, a longitudinal long beam for supporting the large module is provided between the large module support beam and the common support beam, a longitudinal short beam for supporting the small module is provided between the small module support beam and the common support beam, the large module support beam and the small module support beam are connected by a connector, and the large module support beam , the connection between the small module support beam and the connecting piece constitutes a structural mutation part, a longitudinal reinforcement beam is provided on the interlayer support piece, and the longitudinal reinforcement beam is located between the large module and the small module when the lower box is in use, and a bottom support rod is also provided between the lowest interlayer support piece and the bottom support piece of the box body, and the two ends of the bottom support rod are respectively fixedly connected to the longitudinal reinforcement beams of the bottom support piece and the lowest interlayer support piece; when the number of interlayer support pieces is at least two, interlayer support rods are provided between the longitudinal reinforcement beams of adjacent interlayer support pieces, and the two ends of the interlayer support rod are respectively fixedly connected to the longitudinal reinforcement beams of the two adjacent interlayer support pieces.

[0060] Furthermore, a large and small module connecting piece is fixedly installed at the bottom of at least one structural mutation part, and the large and small module connecting piece is provided with a large module connecting through hole and a small module connecting through hole for fasteners to pass through when in use to fix the adjacent large modules and small modules to the large and small module connecting piece respectively.

[0061] Furthermore, at least one large and small module connector constitutes a supporting connector, and the bottom of the supporting connector is also fixedly connected to a supporting connector support rod, the lower end of the supporting connector support rod is fixed on the bottom support member or the longitudinal reinforcement beam, the supporting connector has a structural mutation support surface for supporting the structural mutation part, the supporting connector support rod has a supporting connector support surface for supporting the supporting connector, and the area of ​​the structural mutation support surface is larger than the area of ​​the supporting connector support surface.

[0062] Furthermore, the extension direction of the longitudinal reinforcement beam is defined as the front-to-back direction, there are at least two interlayer support rods, and the setting positions of the interlayer support rods satisfy L2=nL1=nL3, where: L1 is the distance between the interlayer support rod at the rear end and the common support beam, L2 is the distance between the interlayer support rod at the front end and the interlayer support rod at the rear end, L3 is the distance between the interlayer support rod at the front end and the large module support beam, and 2.5≤n≤3.

[0063] Furthermore, each interlayer support member is provided with a through-hole, and each support rod includes a hollow large-diameter section and a small-diameter threaded section at both ends of the hollow large-diameter section. The small-diameter threaded section at the lower end of each support rod is threadedly connected to the bottom support member or the corresponding interlayer support member, and the small-diameter threaded section at the upper end of each support rod is connected with a nut after passing through the through-hole on the corresponding layer support frame. The upper end surface of the hollow large-diameter section constitutes a support surface for supporting the corresponding interlayer support member.

[0064] Furthermore, the supporting connector is provided with a through-hole, and each supporting connector support rod includes a hollow large-diameter section and a small-diameter threaded section at both ends of the hollow large-diameter section. The small-diameter threaded section at the lower end of each supporting connector support rod is respectively threadedly connected to the bottom support member or the corresponding interlayer support member, and the small-diameter threaded section at the upper end of each supporting connector support rod is connected with a nut after passing through the through-hole on the corresponding supporting connector, and the upper end surface of the hollow large-diameter section constitutes the supporting surface of the supporting connector.

[0065] Furthermore, one end of the longitudinal reinforcement beam is connected to the structural mutation portion.

[0066] Furthermore, the extension direction of the longitudinal reinforcement beam is defined as the front-to-back direction, and a front connecting member and a rear connecting member are fixedly installed at the bottom of the interlayer support member. The front connecting member is provided with a front module connecting through-hole for allowing a fastener to pass through when in use to fix the front ends of adjacent battery modules to the front connecting member respectively; the rear connecting member is provided with a rear module connecting through-hole for allowing a fastener to pass through when in use to fix the rear ends of adjacent battery modules to the rear connecting member respectively.

[0067] Furthermore, at least one front connecting member is arranged at the bottom of the structural mutation part and constitutes a large and small module connecting member. The front module connecting through hole on the large and small module connecting member is used for fasteners to pass through when in use to fix the adjacent large modules and small modules to the large and small module connecting members respectively.

[0068] Furthermore, at least one large and small module connector constitutes a supporting connector, and the bottom of the supporting connector is also fixedly connected to a supporting connector support rod, the lower end of the supporting connector support rod is fixed on the bottom support member or the longitudinal reinforcement beam, the supporting connector has a structural mutation support surface for supporting the structural mutation part, the supporting connector support rod has a supporting connector support surface for supporting the supporting connector, and the area of ​​the structural mutation support surface is larger than the area of ​​the supporting connector support surface.

[0069] Furthermore, the support connector includes an L-shaped part, a gantry part and a "7"-shaped part. The L-shaped part includes a horizontal plate and a vertical plate. The junction of the horizontal plate and the vertical plate is fixedly connected to the support rod of the support connector. The large module connection through-hole is arranged at the end of the horizontal plate away from the vertical plate, and the small module connection through-hole is arranged at the end of the vertical plate away from the horizontal plate; the gantry part is arranged in the middle of the horizontal plate, and the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box is connected to a longitudinally extending support plate, and a reinforcing beam is arranged between the support plate and the two vertical plates, and the reinforcing beam and the support plate constitute a "7"-shaped part; the upper plate surface of the support plate constitutes the support surface of the support connector; the end of the horizontal plate and the vertical plate away from the gantry part is provided with an upward-folded vertical folding edge; both the support plate and the connecting plate are provided with mounting holes for connecting to the interlayer support members.

[0070] Furthermore, the rear connecting member includes a horizontal plate and a gantry part. The horizontal plate is provided with an upward-folded vertical folded edge at one end close to the lower box body, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates, and the connecting plate is provided with mounting holes for connecting to the interlayer support members; the rear module connection through holes are arranged at both ends of the horizontal plate.

[0071] Furthermore, at least one front connecting member is arranged at the bottom of the structural mutation part and constitutes a front large module connecting member. The front module connecting through hole on the front large module connecting member is used for fasteners to pass through when in use to fix the adjacent two large modules to the front large module connecting member respectively.

[0072] Furthermore, the front large module connecting part includes a horizontal plate, a gantry part and a "7"-shaped part. The end of the horizontal plate close to the lower box body is provided with an upward-folded vertical folded edge, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box body is connected to a longitudinally extending support plate, and a reinforcing beam is provided between the support plate and the two vertical plates, and the reinforcing beam and the support plate constitute a "7"-shaped part; both the support plate and the connecting plate are provided with mounting holes for connecting to the interlayer support members, and the front module connection through holes are arranged at both ends of the horizontal plate.

[0073] Furthermore, the top-layer battery modules are fixedly connected via top-layer connectors.

[0074] The beneficial effects of the electrical equipment provided by the present invention are as follows: the present invention is an improved invention. The longitudinal reinforcing beams provided between adjacent longitudinal long beams and longitudinal short beams can preliminarily strengthen the structural strength of the interlayer support members and reduce the stress on the structural mutation part; the bottom layer support rods are used to fix the lowest interlayer support member to the bottom support member of the box body, and the interlayer support rods are used to fix the adjacent interlayer support members, and each support rod is fixedly connected to the longitudinal reinforcing beams, so that the support rods can indirectly support the structural mutation part through the longitudinal reinforcing beams, thereby improving the overall structural strength of the lower box body, reducing the stress on the structural mutation part, and avoiding the fracture of the structural mutation part. When the electrical equipment is in motion, the battery pack shakes, and the support rods and the longitudinal reinforcing beams can effectively reduce the deformation of the structural mutation part, that is, reduce the stress on the structural mutation part, and avoid the fracture of the structural mutation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1 Schematic diagram of the structure of stacked battery modules in the prior art (the lower box is not shown);

[0076] Figure 2 for Figure 1 Schematic diagram of the structure of the middle layer support member;

[0077] Figure 3 This is a schematic structural diagram of an interlayer support member in a specific embodiment of the battery pack of the present invention;

[0078] Figure 4 This is a schematic diagram of the structure of the battery modules after stacking in a specific embodiment of the battery pack of the present invention (the lower box is not shown);

[0079] Figure 5 This is a structural diagram of the auxiliary support rod in a specific embodiment of the battery pack of the present utility model;

[0080] Figure 6 for Figure 5 Schematic diagram of the structure of the middle support connector;

[0081] Figure 7 for Figure 5 Schematic diagram of the structure of the middle and front bottom support connector;

[0082] Figure 8 for Figure 5 A schematic structural diagram of the first rear connecting member;

[0083] Figure 9 for Figure 5 A diagram showing the locations of support rods between support members in adjacent layers;

[0084] Figure 10 for Figure 5 Schematic diagram of the structure of the middle support rod.

[0085] Description of reference numerals:

[0086] 1. Large module; 2. Small module; 3. Interlayer support; 31. Longitudinal short beam; 32. Connector; 33. Longitudinal long beam; 34. Transverse reinforcement beam; 35. Longitudinal reinforcement beam; 36. Liquid cooling plate mounting beam; 37. Threaded hole; 38. First through-hole; 391. Small module support beam; 392. Large module support beam; 393. Common support beam; 4. Front top connector; 5. Support connector; 51. Large module connection through-hole; 52. Small module connection through-hole; 53. Second through-hole; 54. First mounting hole; 55. Support surface of supporting connector; 6. Front large module connector; 61. Through-hole one; 62. Second mounting hole; 71. Bottom layer support rod; 72. Interlayer support rod; 73. Support connector support rod; 74. Small-diameter threaded section; 75. Hollow large-diameter section; 751. Stress joint; 752. Tool socket; 8. Rear connector; 81. Through-hole two; 82. Third mounting hole; 9. Rear top layer connector; 10. Bottom support member. DETAILED DESCRIPTION

[0087] In order to solve the problems in the background technology, the core inventive concept of the present utility model is: by preliminarily strengthening the structural strength of the interlayer support members by setting longitudinal reinforcing beams between adjacent longitudinal long beams and longitudinal short beams, the interlayer support members and the bottom support members are connected as a whole through support rods, and the support rods are fixedly connected to the longitudinal reinforcing beams, so that the support rods can indirectly support the structural mutation part through the longitudinal reinforcing beams, thereby improving the overall structural strength of the lower box body, reducing the stress on the structural mutation part, and avoiding the fracture of the structural mutation part.

[0088] The present invention is further described in detail below with reference to the embodiments.

[0089] Specific embodiments of the battery pack provided by the utility model:

[0090] Reference Figure 1-10As shown, the interlayer support member 3 has a large module support beam 392, a small module support beam 391 and a common support beam 393. A longitudinal long beam 33 for supporting the large module 1 is provided between the large module support beam 392 and the common support beam 393. A longitudinal short beam 31 for supporting the small module 2 is provided between the small module support beam 391 and the common support beam 393. The large module support beam 392 and the small module support beam 391 are connected by a connecting member 32, and the connection between the large module support beam 392, the small module support beam 391 and the connecting member 32 constitutes a structural mutation part.

[0091] To facilitate understanding of the technical solution of the present invention, in the present invention, the extension direction of the longitudinal reinforcement beam 35 is defined as the front-rear direction, and both the longitudinal short beam 31 and the longitudinal long beam 33 extend along the front-rear direction.

[0092] Reference Figure 1-10 As shown, the crossbeam of the interlayer support member 3 is a hollow crossbeam, the leftmost and rightmost ends of the hollow crossbeam are open, and the structural strength is relatively low. In order to improve the structural strength, sealing plates for sealing the openings can be welded at the leftmost and rightmost ends of the hollow crossbeam.

[0093] In reference Figure 1-2 On the basis of Figure 3-10 As shown, the battery pack includes a battery box and a battery module installed in the battery box, and the battery box includes a lower box body and a box cover.

[0094] like Figure 3-10 As shown, as a specific embodiment, the battery pack includes three layers of battery modules. The lower box includes a box body and two interlayer support members 3 fixedly mounted on the box body. The interlayer support members 3 are provided with longitudinal reinforcement beams 35. The longitudinal reinforcement beams 35 are located between adjacent longitudinal long beams 33 and longitudinal short beams 31, so that the longitudinal reinforcement beams 35 are located between the large module 1 and the small module 2 when the lower box is in use. A bottom support rod 71 is also provided between the lowest interlayer support member 3 and the bottom support member 10 of the box body. The two ends of the bottom support rod 71 are respectively fixedly connected to the bottom support member 10 and the longitudinal reinforcement beam 35 of the lowest interlayer support member 3. An interlayer support rod 72 is provided between the longitudinal reinforcement beams 35 of adjacent interlayer support members 3. The two ends of the interlayer support rod 72 are respectively fixedly connected to the longitudinal reinforcement beams 35 of the two adjacent interlayer support members 3. The bottom support rod 71 and the interlayer support rod 72 can be exactly the same support rods. One end of the longitudinal reinforcement beam 35 is connected to the structural mutation portion to better improve the structural strength of the interlayer support member 3 and reduce the stress on the structural mutation portion.

[0095] Of course, in other specific embodiments, there can be only one interlayer support member 3, in which case the lower box does not include the interlayer support rod 72; alternatively, there can be three or more interlayer support members 3, with an interlayer support rod 72 provided between any two adjacent interlayer support members 3; alternatively, the front end of the longitudinal reinforcement beam 35 can be connected to a non-structural break on the large module support beam or the small module support beam. The number of battery module layers is one greater than the number of shelf support frames.

[0096] The longitudinal reinforcement beams 35 disposed between adjacent longitudinal long beams 33 and longitudinal short beams 31 can initially strengthen the structural strength of the interlayer support members 3 and reduce the stress on the structural mutation part. The bottom support rods 71 ​​are used to securely connect the lowest interlayer support member 3 to the bottom support member 10 of the box body, and the interlayer support rods 72 are used to securely connect the adjacent interlayer support members 3. Each support rod is securely connected to the longitudinal reinforcement beams 35, thereby enabling the support rods to indirectly support the structural mutation part through the longitudinal reinforcement beams 35, thereby improving the overall structural strength of the lower box body, reducing the stress on the structural mutation part, and preventing the structural mutation part from breaking. When the battery pack shakes, the support rods and the longitudinal reinforcement beams 35 can effectively reduce the deformation of the structural mutation part, that is, reduce the stress on the structural mutation part, and prevent the structural mutation part from breaking.

[0097] like Figure 3-10 As shown, in order to further avoid the fracture of the structural mutation part, as a specific embodiment, the bottom of the interlayer support member 3 is also fixedly mounted with a front connecting member and a rear connecting member 8. The front connecting member is provided with a front module connecting through hole for fasteners to pass through when in use to fix the front ends of adjacent battery modules to the front connecting member. Figure 6 The large module connecting through hole 51 and the small module connecting through hole 52 constitute the front module connecting through hole. Figure 7 The through hole 61 in the middle also constitutes the front module connection through hole; the rear connecting member 8 is provided with a rear module connection through hole for fasteners to pass through when in use to fix the rear ends of adjacent battery modules to the rear connecting member 8, and the rear module connection through hole is Figure 8 The through hole 2 81 is shown in FIG.

[0098] like Figure 3-10 As shown, at least one front connecting member (specifically Figure 4-5 The upper one of the two front connectors is located at the bottom of the structural abrupt change and constitutes a large and small module connector. The front module connection through-holes on the large and small module connectors are used to pass fasteners through to securely connect the adjacent large and small modules 1 and 2 to the connectors, respectively. At least one large and small module connector constitutes a support connector 5. The large module connection through-holes 51 and the small module connection through-holes 52 on the support connector 5 constitute the module connection through-holes.

[0099] like Figure 5-8 As shown, as a specific embodiment, each connecting member (including the front connecting member and the rear connecting member 8) is fixedly connected to the interlayer support member 3 through the corresponding first mounting hole 54, the second mounting hole 62, the third mounting hole 82 and fasteners. Of course, in other specific embodiments, each connecting member can also be fixed to the corresponding interlayer support member 3 by pin connection or the like.

[0100] When manufacturing the battery pack, the large module 1, the connector, and the small module 2 can be fixedly connected together using common fasteners such as screws or pins, and the connector can be fixedly connected to the interlayer support member 3 using common fasteners such as screws or pins. Compared to the technical solution in which the battery modules are not connected to each other and the battery modules are not fixed to the interlayer support member 3, when the battery pack shakes, the large module 1 and the small module 2 shake in the vertical direction to a smaller extent, which can prevent the battery module from suddenly colliding with the interlayer support member 3 and exerting impact force on the structural mutation, thereby reducing the maximum stress at the structural mutation and better preventing the structural mutation from breaking.

[0101] In particular, when the battery pack is used in an electric vehicle, the body of the electric vehicle supports the bottom of the battery pack, and the top-layer battery module is the farthest away from the bottom of the battery pack. When the body of the vehicle shakes, the top-layer battery module in the battery pack shakes the most in the up and down directions. Preferably, the top-layer battery modules are fixedly connected by top-layer connectors (including front top-layer connectors 4 and rear top-layer connectors 9). Compared with the technical solution in which the top-layer battery modules are not connected, the top-layer battery modules are connected as a whole, which can effectively reduce the shaking amplitude of the top-layer battery module, reduce the maximum stress at the structural mutation part, and better avoid the fracture of the structural mutation part.

[0102] However, in other embodiments, Figure 1-2 The same thing as the background art shown is that there is no fixed connection between the battery modules on the same layer.

[0103] like Figure 3-10 As shown, to further enhance the structural strength at the structural discontinuity and reduce the stress on the structural discontinuity, as a specific embodiment, at least one connector constitutes a support connector 5. A support connector support rod 73 is further fixedly connected to the bottom of the support connector 5. The lower end of the support connector support rod 73 is fixed to the bottom support member 10 or the longitudinal reinforcement beam 35. The support connector 5 has a structural discontinuity support surface for supporting the structural discontinuity. The support connector support rod 73 has a support connector support surface 55 for supporting the support connector 5. The area of ​​the structural discontinuity support surface is larger than that of the support connector support surface 55. The support connector 5 increases the supported area of ​​the structural discontinuity, thereby better preventing the structural discontinuity from fracture.

[0104] exist Figure 4-5 In the figure, the battery modules have three layers, and the battery modules on the bottom layer are all large modules 1, the number of supporting connectors 5 is one, and the number of supporting connector support rods 73 is also one; in order to reduce the shaking amplitude of the battery modules on the bottom layer, the battery modules on the bottom layer are fixedly connected by the front large module connector 6 and the rear bottom layer connector.

[0105] However, in other specific embodiments, reference Figure 4-5 As shown, the battery module at the bottom layer may also include a large module 1 and a small module 2. In this case, a support connector rod 73 may be provided between the two interlayer support members 3, and a support connector 5 may be fixedly installed at the bottom of the structural mutation portion of the lowest interlayer support member 3, and another support connector rod 73 may be provided between the support connector 5 and the bottom support member 10.

[0106] like Figure 4-8 As shown, the front connecting member includes a front large module connecting member 6 and a supporting connecting member 5, and there are two rear connecting members 8.

[0107] like Figure 6 As shown, the support connector 5 includes an L-shaped part, a gantry part and a "7"-shaped part. The L-shaped part includes a horizontal plate and a vertical plate. The junction of the horizontal plate and the vertical plate is fixedly connected to the support rod 73 of the support connector. The large module connection through hole 51 is set at the end of the horizontal plate away from the vertical plate, and the small module connection through hole 52 is set at the end of the vertical plate away from the horizontal plate; the gantry part is set in the middle of the horizontal plate, and the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box is connected to a longitudinally extending support plate, and a reinforcing beam is provided between the support plate and the two vertical plates, and the reinforcing beam and the support plate constitute a "7"-shaped part; the upper plate surface of the support plate constitutes the support surface 55 of the support connector; the end of the horizontal plate and the vertical plate away from the gantry part is provided with an upward-folded vertical folding edge; the support plate and the connecting plate are both provided with a first mounting hole 54 for connecting to the interlayer support member 3, which has a simple structure, high strength and small space occupation.

[0108] like Figure 7 As shown, the front large module connecting member 6 includes a horizontal plate, a gantry part and a "7"-shaped part. The end of the horizontal plate close to the lower box body is provided with an upward-folded vertical folded edge, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box body is connected to a longitudinally extending support plate, and a reinforcing beam is provided between the support plate and the two vertical plates, and the reinforcing beam and the support plate constitute a "7"-shaped part; the support plate and the connecting plate are both provided with a second mounting hole 62 for connecting to the interlayer support member 3, and the front module connecting through hole (i.e., through hole 61) is arranged at both ends of the horizontal plate, which has a simple structure, high strength and small space occupation.

[0109] like Figure 8 As shown, the rear connecting member 8 includes a horizontal plate and a gantry part. The horizontal plate is provided with an upwardly folded vertical folded edge at one end close to the lower box body, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates, and the connecting plate is provided with a third mounting hole 82 for connecting to the interlayer support member; the rear module connecting through hole (i.e., through hole 2 81) is arranged at both ends of the horizontal plate, which has a simple structure, high strength and small space occupation.

[0110] However, in other specific implementations, flexible steel strips may also be used to securely connect adjacent modules and the interlayer support members 3 with bolts and nuts, respectively.

[0111] In order to better strengthen the structural strength of the lower box, such as Figure 5 and Figure 9 As shown, the number of interlayer support rods 72 is two, and the setting position of the interlayer support rods 72 satisfies L2=nL1=nL3, where: L1 is the distance between the interlayer support rod 72 at the rear end and the beam at the rear end of the interlayer support member 3, L2 is the distance between the interlayer support rod 72 at the front end and the interlayer support rod 72 at the rear end, L3 is the distance between the interlayer support rod 72 at the front end and the beam at the front end of the interlayer support member 3, 2.5≤n≤3, preferably 2.5, 2.67 or 3.

[0112] When 2.5≤n≤3, the structural strength of the lower box is the highest and the structural mutation part is least likely to break; but in other specific embodiments, three, four or more roots can be set, and n can also be any number such as 1 or 4, as long as the structural strength of the lower box can be guaranteed to meet the use requirements, and there is no need to increase the structural strength of the lower box indefinitely.

[0113] In order to facilitate the installation of the support rod, as a specific implementation method, Figure 3-10As shown, each interlayer support member 3 is provided with a perforation, and each support rod (including the bottom support rod 71, the interlayer support rod 72, and the support connector support rod 73) includes a hollow large-diameter section 75 and small-diameter threaded sections 74 located at both ends of the hollow large-diameter section 75. The small-diameter threaded section 74 at the lower end of each bottom support rod 71 is threadedly connected to the bottom support member 10, the small-diameter threaded section 74 at the lower end of each interlayer support rod 72 is threadedly connected to the corresponding interlayer support member 3, and the small-diameter threaded section 74 at the lower end of each support connector support rod 73 is threadedly connected to the bottom support member 10 or the corresponding interlayer support 3. The small-diameter threaded section 74 at the upper end of each bottom-level support rod 71 and inter-level support rod 72 passes through the first through-hole 38 of the corresponding layer support frame and is then connected to a nut. The upper end surface of the hollow large-diameter section 75 of each bottom-level support rod 71 and inter-level support rod 72 constitutes a support surface for supporting the corresponding inter-level support member 3. The small-diameter threaded section 74 at the upper end of each support-connecting member support rod 73 passes through the second through-hole 53 of the corresponding support-connecting member 5 and is then connected to a nut. The upper end surface of the hollow large-diameter section 75 constitutes the support surface 55 of the support-connecting member. The small-diameter threaded section 74 facilitates the installation of the support rod. Preferably, stress slits 751 are machined at both ends of the hollow large-diameter section 75 to avoid stress concentration at both ends of the hollow large-diameter section 75. A tool insertion hole 752 is also machined on the outer circumference of the hollow large-diameter section 75. Inserting a tool into the tool insertion hole 752 facilitates the screwing of the support rod.

[0114] However, in other specific embodiments, both ends of the support rod can be fixedly connected to the corresponding structure (bottom support member, shelf support frame or support connector 5) by pinning, welding or the like.

[0115] Reference Figure 1-10 As shown, a transverse reinforcement beam 34 may also be provided on the interlayer support member 3 to further increase the structural strength of the transverse reinforcement beam 34 .

[0116] In assembly Figure 3-10 For a battery pack with three-layer battery modules, refer to the following steps for assembly:

[0117] Step S1, installing the bottom support rod 71 on the bottom support member 10;

[0118] Step S2: Install the bottom liquid cooling plate;

[0119] Step S3: Install the bottom battery module;

[0120] Step S4: Using connectors to securely connect the bottom battery module;

[0121] Step S5: installing an interlayer support member 3;

[0122] Step S6: Install the interlayer support rods 72 and the support connector support rods 73 through the threaded holes 37 of the interlayer support members 3, and install the liquid cooling plate through the liquid cooling plate mounting beams 36 of the interlayer support members 3;

[0123] Step S7: Installing the middle battery module and corresponding connectors;

[0124] Step S8: Install another interlayer support member 3, and install the liquid cooling plate through the liquid cooling plate mounting beam 36 of the interlayer support member 3;

[0125] Step S9: Install the top battery module and corresponding connectors.

[0126] When the battery module has two, four, or other layers, the battery pack can be assembled according to the above steps. Of course, according to actual needs, components such as liquid cooling plates and connectors can also be omitted.

[0127] The specific embodiment of the lower box provided by the utility model is as follows:

[0128] The specific structure of the lower box in this embodiment is the same as that of the lower box in the specific embodiment of the battery pack of the present invention, and will not be repeated here.

[0129] The specific embodiment of the battery box provided by the utility model is as follows:

[0130] The specific structure of the battery box in this embodiment is the same as the structure of the battery box in the specific embodiment of the battery pack of the present invention, and will not be repeated here.

[0131] Specific embodiments of the electrical equipment provided by the utility model:

[0132] The electrical equipment includes a battery pack. The specific structure of the battery pack is the same as that of the battery pack in the specific embodiment of the battery pack of the present invention, and will not be repeated here.

[0133] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A lower box body, comprising a box body and at least one interlayer support member fixedly mounted on the box body, wherein the interlayer support member comprises a large module support beam, a small module support beam and a common support beam, a longitudinal long beam for supporting the large module is provided between the large module support beam and the common support beam, a longitudinal short beam for supporting the small module is provided between the small module support beam and the common support beam, the large module support beam and the small module support beam are connected by a connector, and the connection between the large module support beam, the small module support beam and the connector constitutes a structural mutation portion, characterized in that: A longitudinal reinforcement beam is provided on the interlayer support member, and the longitudinal reinforcement beam is located between the large module and the small module when the lower box body is in use. A bottom support rod is also provided between the lowest interlayer support member and the bottom support member of the box body, and the two ends of the bottom support rod are respectively fixedly connected to the longitudinal reinforcement beams of the bottom support member and the lowest interlayer support member; when the number of interlayer support members is at least two, an interlayer support rod is provided between the longitudinal reinforcement beams of adjacent interlayer support members, and the two ends of the interlayer support rod are respectively fixedly connected to the longitudinal reinforcement beams of the two adjacent interlayer support members.

2. The lower box according to claim 1, characterized in that: A large and small module connecting piece is fixedly installed at the bottom of at least one structural mutation part, and the large and small module connecting piece is provided with a large module connecting through hole and a small module connecting through hole for fasteners to pass through when in use to fix the adjacent large modules and small modules to the large and small module connecting piece respectively.

3. The lower box according to claim 2, characterized in that: At least one large and small module connector constitutes a supporting connector, and the bottom of the supporting connector is also fixedly connected to a supporting connector support rod, the lower end of the supporting connector support rod is fixed on the bottom support member or the longitudinal reinforcement beam, and the supporting connector has a structural mutation support surface for supporting the structural mutation part, and the supporting connector support rod has a supporting connector support surface for supporting the supporting connector, and the area of ​​the structural mutation support surface is larger than the area of ​​the supporting connector support surface.

4. The lower box according to any one of claims 1 to 3, characterized in that: The longitudinal reinforcement beam is defined as extending in the front-to-back direction. There are at least two interlayer support rods, and the interlayer support rods are positioned to meet the following requirements: ， Where: L 1 is the distance between the rearmost interlayer support rod and the common support beam, L 2 is the distance between the frontmost interlayer support rod and the rearmost interlayer support rod, L 3 is the distance between the frontmost interlayer support rod and the large module support beam. .

5. The lower box according to claim 1 or 2, characterized in that: Each interlayer support member is provided with a through-hole, and each support rod includes a hollow large-diameter section and small-diameter threaded sections at both ends of the hollow large-diameter section. The small-diameter threaded section at the lower end of each support rod is threadedly connected to the bottom support member or the corresponding interlayer support member, and the small-diameter threaded section at the upper end of each support rod is connected with a nut after passing through the through-hole on the corresponding layer support frame. The upper end surface of the hollow large-diameter section constitutes a support surface for supporting the corresponding interlayer support member.

6. The lower box according to claim 3, characterized in that: The supporting connector is provided with a through-hole, and each supporting connector support rod includes a hollow large-diameter section and a small-diameter threaded section at both ends of the hollow large-diameter section. The small-diameter threaded section at the lower end of each supporting connector support rod is respectively threadedly connected to the bottom support member or the corresponding interlayer support member. The small-diameter threaded section at the upper end of each supporting connector support rod is connected with a nut after passing through the through-hole on the corresponding supporting connector, and the upper end surface of the hollow large-diameter section constitutes the supporting surface of the supporting connector.

7. The lower box according to any one of claims 1 to 3, characterized in that: One end of the longitudinal reinforcement beam is connected to the structural mutation part.

8. The lower box according to claim 1, characterized in that: The extension direction of the longitudinal reinforcement beam is defined as the front-to-back direction, and a front connecting member and a rear connecting member are also fixedly installed at the bottom of the interlayer support member. The front connecting member is provided with a front module connecting through-hole for allowing a fastener to pass through when in use to fix the front ends of adjacent battery modules to the front connecting member respectively; the rear connecting member is provided with a rear module connecting through-hole for allowing a fastener to pass through when in use to fix the rear ends of adjacent battery modules to the rear connecting member respectively.

9. The lower box according to claim 8, characterized in that: At least one front connecting member is arranged at the bottom of the structural mutation part and constitutes a large and small module connecting member. The front module connecting through hole on the large and small module connecting member is used for fasteners to pass through when in use to fix the adjacent large modules and small modules to the large and small module connecting members respectively.

10. The lower box according to claim 9, characterized in that: At least one large and small module connector constitutes a supporting connector, and the bottom of the supporting connector is also fixedly connected to a supporting connector support rod, the lower end of the supporting connector support rod is fixed on the bottom support member or the longitudinal reinforcement beam, and the supporting connector has a structural mutation support surface for supporting the structural mutation part, and the supporting connector support rod has a supporting connector support surface for supporting the supporting connector, and the area of ​​the structural mutation support surface is larger than the area of ​​the supporting connector support surface.

11. The lower box according to claim 3 or 10, characterized in that: The support connector includes an L-shaped part, a gantry part and a "7"-shaped part. The L-shaped part includes a horizontal plate and a vertical plate. The junction of the horizontal plate and the vertical plate is fixedly connected to the support rod of the support connector. The large module connection through-hole is arranged at the end of the horizontal plate away from the vertical plate, and the small module connection through-hole is arranged at the end of the vertical plate away from the horizontal plate; the gantry part is arranged in the middle of the horizontal plate, and the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box is connected to a longitudinally extending support plate, and a reinforcing beam is arranged between the support plate and the two vertical plates, and the reinforcing beam and the support plate constitute a "7"-shaped part; the upper plate surface of the support plate constitutes the support surface of the support connector; the end of the horizontal plate and the vertical plate away from the gantry part is provided with an upward-folded vertical folding edge; the support plate and the connecting plate are both provided with mounting holes for connecting to the interlayer support members.

12. The lower box according to any one of claims 8 to 10, characterized in that: The rear connecting part includes a horizontal plate and a gantry part. The horizontal plate is provided with an upward-folded vertical folded edge at one end close to the lower box body, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates, and the connecting plate is provided with mounting holes for connecting to the interlayer support members; the rear module connection through holes are arranged at both ends of the horizontal plate.

13. The lower box according to any one of claims 8 to 10, characterized in that: At least one front connecting member is arranged at the bottom of the structural mutation part and constitutes a front large module connecting member. The front module connecting through hole on the front large module connecting member is used for fasteners to pass through when in use to fix the adjacent two large modules to the front large module connecting member respectively.

14. The lower box according to claim 13, characterized in that: The front large module connecting parts include a horizontal plate, a gantry part and a "7"-shaped part. The end of the horizontal plate close to the lower box body is provided with an upward-folded vertical folded edge, and the gantry part is arranged at the other end of the horizontal plate; the gantry part includes two vertical plates and a connecting plate connected to the top of the two vertical plates; the end of the connecting plate close to the middle of the lower box body is connected to a longitudinally extending support plate, and a reinforcing beam is provided between the support plate and the two vertical plates. The reinforcing beam and the support plate form a "7"-shaped part; both the support plate and the connecting plate are provided with mounting holes for connecting to the interlayer support members, and the front module connection through holes are arranged at both ends of the horizontal plate.

15. A battery box, comprising a lower box body and a box cover, characterized in that: The lower box body is the lower box body described in any one of claims 1-14.

16. A battery pack comprising a battery box and a battery module installed in the battery box, characterized in that: The battery case is the battery case according to claim 15.

17. The battery pack according to claim 16, wherein: The top-layer battery modules are fixedly connected by top-layer connectors.

18. An electrical device comprising a battery pack, characterized in that: The battery pack is the battery pack according to claim 16 or 17.

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