PTC (Positive Temperature Coefficient) device for battery pack and battery pack assembly with PTC device

Abstract

The invention relates to the field of battery packs, in particular to a PTC (Positive Temperature Coefficient) device for a battery pack and a battery pack assembly with the PTC device, the PTC device comprises a plurality of heating units, and each heating unit comprises a heating mechanism and a supporting mechanism; the heating mechanism is connected to the battery pack shell through the supporting mechanism; the heating mechanism comprises an aluminum plate, and a PTC heating core is arranged on the aluminum plate. The supporting mechanism comprises a supporting plate; the aluminum plate is arranged on the supporting plate; the supporting plate is connected to the battery pack shell; through the use of the PTC device, the battery pack can be heated, and the use effect of the battery pack is ensured; besides, the PTC device disclosed by the invention heats the battery cell structure in the battery pack in a form of matching a PTC with a silica gel pad, so that the heating rate can be well improved, and meanwhile, the PTC device is arranged at the bottom of the battery cell structure, so that the arrangement stability of the battery cell structure in a battery pack shell can be ensured.

Description

Technical Field

[0001] The present invention relates to the field of battery packs, and in particular to a PTC device for a battery pack and a battery pack assembly having the PTC device. Background Art

[0002] Ordinary cars burn gasoline, and their emissions contain a lot of waste gas. New energy vehicles usually refer to cars driven by electricity, which have no emissions and are environmentally friendly. Gradually reduce or even stop the production of fuel vehicles, increase the production of new energy vehicles, and new energy vehicles have become the future development trend.

[0003] Existing new energy electric vehicles do not have engines and need to be powered by batteries to use electricity to drive the vehicle.

[0004] In the prior art, when the temperature of automobile batteries is below 0 degrees Celsius, the discharge and charging effects are very poor, and the battery may even suddenly lose power. Therefore, the use of new energy vehicles in cold areas or in winter is greatly restricted.

[0005] To solve the above problems, the same industry adopts the method of adding a heating film at the bottom of the module to heat the module, such as patent: 201811531673.4-battery module heating film, battery pack and its lower shell and battery pack assembly method.

[0006] But the heating film has the following disadvantages:

[0007] (1) Slow heating rate;

[0008] (2) The heating temperature cannot reach a higher value temporarily;

[0009] (3) Heat dissipates quickly after power failure.

[0010] In order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing battery pack structure. Summary of the invention

[0011] An object of the present invention is to provide a PTC device that can be used for heating a battery pack.

[0012] In order to achieve the above object, the technical solution adopted by the present invention is:

[0013] A PTC device for a battery pack includes a plurality of heating units, each of which includes a heating mechanism and a supporting mechanism; the heating mechanism is connected to a battery pack housing through the supporting mechanism;

[0014] The heating mechanism comprises an aluminum plate, and a PTC heating core is arranged on the aluminum plate;

[0015] The support mechanism includes a support plate; the aluminum plate is arranged on the support plate; and the support plate is connected to the battery pack housing.

[0016] The aluminum plate and the support plate are connected via a plug-in mechanism, which includes a plurality of plug-in parts, each of which includes a plug-in column arranged on the aluminum plate and a plug-in hole arranged on the support plate, and the plug-in column is plugged into the support plate via the plug-in hole.

[0017] The aluminum plate includes a plate body, on which a laying block is provided, and the inside of the laying block is hollow to form a connection channel; the plate body is also provided with a plurality of reinforcing ribs; the plurality of reinforcing ribs are symmetrically distributed on both sides of the laying block; the height of the plug-in column is greater than the thickness of the laying block and the reinforcing ribs.

[0018] The support plate includes a support plate body; the support plate body includes a base plate; lap plates are provided on both sides of the base plate, and each lap plate is connected to the base plate through a connecting plate; the lap plates and the base plate are parallel and staggered with each other; the connecting plate is arranged perpendicular to the base plate and the lap plates.

[0019] A silicone pad is laid on the side of the aluminum plate away from the supporting plate; and supporting foam is arranged between the base plate and the laying block.

[0020] A battery pack assembly, comprising a battery pack shell; the battery pack shell comprises a battery pack frame, the battery pack frame is provided with the PTC device; the battery cell structure is arranged on the PTC device and fixed on the battery pack frame; the battery pack frame comprises an external frame, the external frame comprises four external side beams, the four external side beams are sequentially connected to form a U-shaped distribution; each of the external side beams comprises a side beam body; the side beam body is hollow inside to form a material reduction channel; the side beam body comprises a longitudinal side beam and a transverse side beam; the transverse side beam is staggered with the longitudinal side beam;

[0021] The battery pack frame also includes a central support beam, which includes a central beam body. The central beam body is hollow inside to form a central material reduction channel; the central beam body includes a central longitudinal beam and a central cross beam; the central longitudinal beam is arranged perpendicular to the central cross beam, and the vertical cross section of the central beam body is an inverted T shape; the lower end surface of the central cross beam and the lower end surface of the transverse side beam are on the same plane.

[0022] When adjacent external side beams are overlapped, a clamping groove is provided at the end of one external side beam, and the transverse side beam in the other external side beam is clamped on the adjacent external side beam through the clamping groove; the clamping groove is at the same height as the transverse side beam.

[0023] The battery cell structure includes multiple battery cell modules; the multiple battery cell modules are distributed in the battery pack shell; the battery cell module includes a battery cell unit, and the end of the battery cell unit is provided with a module end plate, and the module end plate is connected to the battery pack shell through a fastening component, and the fastening component includes a connecting bolt; the connecting bolt passes through the module end plate and is fixedly connected to the battery pack shell; the battery pack also includes a bridging mechanism, and the bridging mechanism includes a bridging plate, and the bridging plate is overlapped on at least two battery cell modules; the fastening component passes through the bridging plate and is connected to the corresponding battery cell module.

[0024] The bridge plate includes a longitudinal connecting plate; a transverse support plate is provided on the longitudinal connecting plate, and the bridge plate is overlapped on the module end plate of the corresponding battery cell module through the transverse support plate; the longitudinal connecting plate and the transverse support plate are arranged perpendicular to each other; positioning grooves are provided at the corners of the module end plate; the transverse support plate of each bridge plate is embedded in the positioning groove of the adjacent module end plate; the longitudinal connecting plate is attached to the outer side of the module end plate.

[0025] A connector is provided on at least one external side beam in the battery pack shell; the connector is connected to the external side beam through a connecting plate assembly; the connecting plate assembly includes a connecting plate body, and a rivet nut is provided on the connecting plate body; a mounting through hole is provided on the external side beam; the connector is connected to the external side beam through the connecting plate assembly.

[0026] The advantages of the present invention are:

[0027] The invention discloses a PTC device for a battery pack and a battery pack assembly having the PTC device.

[0028] The present invention can heat the battery pack by using the PTC device, thereby ensuring the use effect of the battery pack.

[0029] In addition, the PTC device disclosed in the present invention heats the battery cell structure in the battery pack by combining PTC and silicone pad, which can greatly improve the heating rate. At the same time, the PTC device is arranged at the bottom of the battery cell structure, which can also ensure the stability of the battery cell structure in the battery pack shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0031] Figure 1 It is a schematic diagram of the structure of the PTC device in the present invention.

[0032] Figure 2 It is a schematic diagram of the structure of the aluminum plate in the present invention.

[0033] Figure 3 It is a partial enlarged view of the aluminum plate in the present invention.

[0034] Figure 4 It is a structural schematic diagram of the support plate in the present invention.

[0035] Figure 5 It is a side view of the heating unit in the present invention.

[0036] Figure 6 It is a schematic diagram of the structure of the battery pack assembly in the present invention.

[0037] Figure 7 It is a structural schematic diagram of a battery core structure connected with a fastening component in the present invention.

[0038] Figure 8 for Figure 7 A partial enlarged view of the .

[0039] Fig. 9 It is a schematic structural diagram of the external side beam with a connector from the first perspective in the present invention.

[0040] Fig.10 It is a structural schematic diagram of the external side beam with a connector from a second viewing angle in the present invention.

[0041] Fig.11 It is a schematic structural diagram of the external side beam in the present invention.

[0042] Fig.12 It is a structural schematic diagram of the connecting plate assembly in the present invention from a first viewing angle.

[0043] Fig.13 It is a structural schematic diagram of the connecting plate assembly in the present invention from a second viewing angle.

[0044] Fig.14 It is a structural schematic diagram of the connecting plate body in the present invention.

[0045] Fig.15 It is a schematic diagram of the structure of the rivet nut in the present invention.

[0046] Fig.16 It is a schematic diagram of the structure of the battery pack frame in the present invention.

[0047] Fig.17 This is a schematic diagram of the structure of the battery pack frame in the present invention without the external side beam on one side.

[0048] The marks in the above figure are:

[0049] 1. PTC device, 2. Battery pack shell, 3. Battery cell structure, 4. Bridge plate, 5. Connecting bolts. DETAILED DESCRIPTION

[0050] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0051] A PTC device for a battery pack includes a plurality of heating units 1-1, each of which includes a heating mechanism and a supporting mechanism; the heating mechanism is connected to a battery pack housing 2 via the supporting mechanism; the present invention can heat the battery pack by using the PTC device 1 to ensure the use effect of the battery pack.

[0052] The plurality of heating units 1 - 1 are distributed at intervals.

[0053] The PTC device 1 disclosed in the present invention is mainly used to heat the battery cell structure 3 in the battery pack.

[0054] The PTC device 1 disclosed in the present invention comprises a plurality of heating units 1-1, each of which comprises a heating mechanism and a supporting mechanism; the heating mechanism is connected to the battery pack shell 2 via the supporting mechanism; the heating mechanism heats up when powered on to achieve a temperature increase operation on the battery cell structure 3, and the supporting mechanism has one function of supporting the heating mechanism and another function of supporting the battery cell, while better ensuring the contact stability between the battery cell structure 3 and the heating mechanism.

[0055] In the present invention, the heating mechanism comprises an aluminum plate 12, on which a PTC heating core is disposed; in the present invention, the PTC heating core may be a PTC heating core with an electrode at one end; and it is energized to generate heat during subsequent use.

[0056] In addition, the use of the aluminum plate 12 in the present invention enables the heating mechanism to have good thermal conductivity, and the supporting mechanism in the present invention includes a supporting plate 11; the aluminum plate 12 is arranged on the supporting plate 11; the supporting plate 11 is connected to the battery pack shell 2; the supporting plate 11 is a connecting member and a supporting member, which is convenient for supporting and placing the battery cell structure 3.

[0057] Furthermore, in the present invention, the aluminum plate 12 and the support plate 11 are connected via a plug-in mechanism. The provision of the plug-in mechanism can achieve installation and fixation between the aluminum plate 12 and the support plate 11, and at the same time, facilitate installation and positioning of the aluminum plate 12. Because in actual design, the length of the aluminum plate 12 is shorter than the support plate 11, if no additional fixing mechanism is added, the aluminum plate 12 will deviate or shake in the battery pack shell 2, causing abnormal noise in the battery pack. In order to avoid the above-mentioned problem, the present invention is provided with a plug-in mechanism, which plays a good limiting role and avoids installation positioning of the aluminum plate 12.

[0058] Specifically, the plug-in mechanism in the present invention includes a plurality of plug-in parts. The arrangement of the plug-in parts enables the aluminum plate 12 to be plugged into the support plate 11. Such a design can achieve the connection between the aluminum plate 12 and the support plate 11 and facilitate the limitation of the position of the aluminum plate 12 itself.

[0059] In addition, in the present invention, each of the plug-in parts includes a plug-in column 124 arranged on the aluminum plate 12 and a plug-in hole arranged on the support plate 11, and the plug-in column 124 is plugged into the support plate 11 through the plug-in hole; generally, at least two plug-in parts are provided on the aluminum plate 12, and each plug-in part is distributed at intervals. The plug-in column 124 can be a stepped column structure or a smooth cylindrical structure, which can be selected according to needs.

[0060] Furthermore, in the present invention, the aluminum plate 12 includes a plate body 121, which is the main structure of the aluminum plate 12, and a laying block 122 is provided on the plate body 121. The laying block 122 is a raised block, which can not only ensure the structural strength of the aluminum plate 12, but also can be used for the placement and protection of the PTC heating core. Specifically, in the present invention, the laying block 122 is hollow inside to form a connecting channel 123; the connecting channel 123 provides a place for placing the PTC heating core.

[0061] At the same time, in the present invention, a plurality of reinforcing ribs 126 are also provided on the plate body 121; the plurality of reinforcing ribs 126 are symmetrically distributed on both sides of the paving block 122; the setting of the reinforcing ribs 126 has one function of increasing the structural strength of the aluminum plate 12, and another function of providing a good support to prevent the aluminum plate 12 from tipping over laterally.

[0062] At the same time, in the present invention, the height of the plug-in column 124 is greater than the thickness of the laying block 122 and the reinforcing rib 126; such a setting allows the plug-in column 124 to be plugged into the groove of the bottom guard plate 23 to ensure the supporting force of the lower end of the aluminum plate 12.

[0063] Furthermore, in the present invention, the support plate 11 includes a support plate body; the support plate body is the main structure of the support plate 11, and in the present invention, the support plate body includes a substrate 111; lap plates 112 are provided on both sides of the substrate 111, and each lap plate 112 is connected to the substrate 111 through a connecting plate 113; the lap plates 112 and the substrate 111 are parallel and staggered to each other; the connecting plate 113 is arranged perpendicular to the substrate 111 and the lap plates 112 at the same time; in the present invention, the lap plates 112 on both sides are in contact with the aluminum plate 12 to play a good supporting role, and the coordinated use of the substrate 111, the connecting plate 113 and the lap plates 112 makes the support plate 11 an inverted "X"-shaped structure, that is, the support does not form a groove structure, which is convenient for the placement and arrangement of the laying blocks 122 and the reinforcing ribs 126 on the aluminum plate 12, and at the same time, it is also convenient for the placement and arrangement of the heating mechanism.

[0064] Furthermore, in the present invention, a silicone pad is laid on the side of the plate body 121 of the aluminum plate 12 away from the support plate 11; the silicone pad can not only play a good supporting and buffering role, but the silicone pad disclosed in the present invention is also a thermally conductive silicone pad, which optimizes heat transfer.

[0065] In addition, in the present invention, a supporting foam 125 is provided between the base plate 111 and the laying block 122 ; the supporting foam 125 plays a good supporting and protective role, and at the same time avoids rigid collision between the aluminum plate 12 and the supporting plate 11 .

[0066] A battery pack assembly includes a battery pack shell 2; the battery pack shell 2 includes a battery pack frame, and the battery pack frame is provided with the PTC device 1; the battery cell structure 3 is arranged on the PTC device 1 and fixed on the battery pack frame; the PTC device 1 disclosed in the present invention heats the battery cell structure 3 in the battery pack in the form of a PTC plus a silicone pad, which can greatly improve the heating rate. At the same time, the PTC device 1 is arranged at the bottom of the battery cell structure 3, and the stability of the arrangement of the battery cell structure 3 in the battery pack shell 2 can also be ensured.

[0067] In the present invention, the basic function of the PTC device 1 is to heat the battery cell structure 3 to ensure that the battery pack has a good use effect in winter; another function is to play a good supporting role to ensure the stability of the arrangement of the battery cell structure 3 in the battery pack shell 2.

[0068] In the present invention, the battery pack assembly mainly includes a battery pack shell 2; the battery pack shell 2 is an external protective structure of the battery pack assembly, and the main body is a box structure.

[0069] In the present invention, the battery pack housing 2 includes a battery pack frame, which is the main structure of the battery pack housing 2. A bottom guard plate 23 is provided at the bottom of the battery pack frame, and a box cover is provided at the upper end of the battery pack frame.

[0070] At the same time, the battery pack frame described in the present invention includes an external frame, and the external frame includes four external side beams 21, and the four external side beams 21 are connected in sequence to form a U-shaped distribution; in the present invention, the four external side beams 21 are connected in sequence to form a frame structure with a horizontal projection of a U-shaped shape; the external side beams 21 disclosed in the present invention are rolled profiles, and their own structural strength is relatively large, which is beneficial to ensure the overall structural strength of the shell mechanism. At the same time, in the present invention, the sizes of the four external side beams 21 are designed according to needs, and generally two relatively parallel external side beams 21 have the same size; during actual assembly, the outer shell mechanism can be designed as a cuboid structure or a cube structure; it can be specifically designed according to needs.

[0071] In addition, in the present invention, the external side beams 21 are connected by welding, or by a detachable connection.

[0072] At the same time, in the present invention, each of the external side beams 21 includes a side beam body 2011; the side beam body 2011 is hollow inside to form a material reduction channel; this makes the external side beam 21 equivalent to an internal hollow box structure, which is beneficial to the overall lightweight of the battery pack.

[0073] In the present invention, the side beam body 2011 includes a longitudinal side beam 211 and a transverse side beam 212; the transverse side beam 212 is distributed on the side of the longitudinal side beam 211. This arrangement makes the side beam body 2011 as a whole similar to an L-shaped structure. This arrangement not only facilitates the overlapping of the battery cell mechanism during subsequent use, but also facilitates the overlapping of the subsequent PTC device.

[0074] In addition, it should be noted that the transverse side beam 212 and the longitudinal side beam 211 described in the present invention are staggered; the staggered distribution here mainly refers to the lower end surface of the transverse side beam 212 close to the bottom guard plate 23 of the battery pack assembly and the lower end surface of the longitudinal side beam 211 close to the bottom guard plate 23 of the battery pack are on two planes; this forms a step at the connection between the transverse side beam 212 and the longitudinal side beam 211, thereby forming a placement space, which is convenient for the overlap of the support plate 11 on the battery pack frame, while also avoiding affecting the flatness of the bottom of the battery pack, and avoiding the bottom guard plate 23 from tilting due to the setting of the support plate 11; at the same time, the step formed above can also be used for installation limiting the end of the support plate 11.

[0075] In addition, the above-mentioned transverse side beams 212 also play a good overlapping role, which facilitates the overlapping installation of the battery cell structure 3 and the support plate 11.

[0076] In addition, the battery pack frame described in the present invention also includes a middle support beam, which plays a role of middle pressure reinforcement to ensure the middle structural strength of the battery pack frame.

[0077] At the same time, the middle support beam in the present invention includes a middle beam body 204, and the middle beam body 204 is hollow inside to form a middle material reduction channel; such a configuration also makes the middle support beam a box structure with a hollow interior, thereby achieving lightweight of the middle support beam.

[0078] At the same time, in the present invention, the middle beam 204 includes a middle longitudinal beam 241 and a middle cross beam 242; the middle longitudinal beam 241 is arranged perpendicular to the middle cross beam 242, and the vertical cross section of the middle beam 204 is an inverted T shape; based on such a setting, a stepped platform is formed at both ends of the middle beam 204, and such a setting facilitates the overlapping installation of the battery cell mechanism; at the same time, it also facilitates the overlapping installation of the subsequent BDU assembly or BMS assembly.

[0079] In addition, in the present invention, the lower end surface of the middle cross beam 242 and the lower end surface of the transverse side beam 212 are on the same plane; such a setting can avoid the setting of the middle cross beam 242 and cause the support plate 11 to be arranged tilted, which is beneficial to ensure the flatness of the battery pack.

[0080] Furthermore, in the present invention, when adjacent external side beams 21 are overlapped, a clamping groove 213 is provided at the end of one external side beam 21, and the transverse side beam 212 in the other external side beam 21 is clamped on the adjacent external side beam 21 through the clamping groove 213; based on such a setting, the overlapping installation between the external side beams 21 can be achieved, which can not only ensure the stability of the installation between the external side beams 21, but also increase the contact area between the external side beams 21, and better ensure the stability of the connection of the external side beams 21. In the subsequent connection, the adjacent external side beams 21 are connected by welding, thereby ensuring the stability of the connection between the external side beams 21.

[0081] At the same time, in the present invention, the snap-in groove 213 is at the same height as the transverse side beam 212; based on such a setting, the present invention facilitates the snap-in between adjacent external side beams 21, while ensuring the flatness of the bottom of the battery pack frame composed of the external side beams 21, so that the external side beams 21 have obvious mutual positioning effect.

[0082] Furthermore, in the present invention, the battery cell structure 3 includes multiple battery cell modules 31; the multiple battery cell modules 31 are distributed in the battery pack shell 2; the specific number and arrangement of the battery cell modules 31 can be designed according to needs; in the present invention, the battery cell module 31 includes a battery cell unit, and a module end plate 32 is provided at the end of the battery cell unit, and the module end plate 32 is connected to the battery pack shell 2 through a fastening component. The setting of the fastening component allows the battery cell module 31 to be directly fixed on the battery pack shell 2, thereby ensuring the stability of the arrangement of the battery cell module 31 in the battery pack.

[0083] In addition, in the present invention, one end of the battery cell module 31 is overlapped on the transverse side beam 212 of the external side beam 21 arranged at one end, and the other end is overlapped on the middle cross beam 242; subsequently, each module end plate 32 in each battery cell module 31 is fixed to the corresponding transverse side beam 212 or the middle cross beam 242 by at least two fastening components; such a design facilitates the fixed installation of the battery cell structure 3 in the battery pack shell 2.

[0084] In the present invention, the fastening component includes a connecting bolt 5; the connecting bolt 5 passes through the module end plate 32 and is fixedly connected to the battery pack shell 2; a through hole is provided on the module end plate 32, and the connecting bolt 5 passes through the through hole on the module end plate 32 in the longitudinal direction and is connected to the battery pack shell 2.

[0085] Furthermore, the battery pack in the present invention also includes a bridging mechanism. The setting of the bridging mechanism plays a good connection role and ensures a stable connection between adjacent or at least two battery cell modules 31.

[0086] In the present invention, the bridging mechanism includes a bridging plate 4, which is overlapped on at least two battery cell modules 31; the fastening component passes through the bridging plate 4 and is connected to the corresponding battery cell module 31; the bridging plate 4 is a plate structure, which plays a good bridging and connecting role, and facilitates the fixed connection between adjacent battery cell modules 31; based on such a setting, the integrity of the battery cell structure 3 is guaranteed.

[0087] In addition, in the present invention, the bridging plate 4 includes a longitudinal connecting plate 42; a transverse supporting plate 41 is provided on the longitudinal connecting plate 42. In the present invention, the longitudinal connecting plate 42 is used for overlapping between the battery modules 31, and cooperates with the fastening components to realize the installation and fixation of the battery module 31.

[0088] At the same time, in the present invention, the bridging plate 4 is overlapped on the module end plate 32 of the corresponding battery module 31 through the transverse support plate 41; the longitudinal connecting plate 42 and the transverse support plate 41 are arranged perpendicular to each other; the longitudinal connecting plate 42 is attached to the outer side of the module end plate 32; the bridge plate of the present invention is an inverted L-shaped plate structure, which plays a good longitudinal and transverse limiting role, and can ensure the accurate assembly of adjacent or relative battery modules 31; and ensure the accuracy of the assembly position of the battery module 31.

[0089] Furthermore, in the present invention, positioning grooves 33 are provided at the corners of the module end plates 32; the transverse support plates 41 of each bridging plate 4 are embedded in the positioning grooves 33 of the adjacent module end plates 32; the positioning grooves 33 are an installation slot structure, which is convenient for lateral positioning of the transverse support plates 41 to avoid shaking of the battery cell module 31.

[0090] Furthermore, in the present invention, a connector 22 is provided on at least one external side beam 21 in the battery pack shell 2; the connector 22 is connected to the external side beam 21 through a connecting plate assembly 202; the connecting plate assembly 202 includes a connecting plate body 2021, and a rivet nut 2022 is provided on the connecting plate body 2021; a mounting through hole is provided on the external side beam 21; the connector 22 is connected to the external side beam 21 through the connecting plate assembly 202; the connecting plate assembly 202 of the present invention acts as a connector and a bridge, which facilitates the installation of the connector 22 on the corresponding external side beam 21.

[0091] In the present invention, a connector 22 is provided on the external side beam 21 at the front end and the rear end of the battery; in the present invention, the connector 22 is connected to the external side beam 21 through a connecting plate assembly 202; the connecting plate assembly 202 includes a connecting plate body 2021, and a rivet nut 2022 is provided on the connecting plate body 2021; a mounting through hole is provided on the external side beam 21; the connector 22 is connected to the external side beam 21 through the connecting plate assembly 202; the present invention provides a good bridging effect through the setting of the connecting plate assembly 202, which facilitates the connection of the connector 22 to the external side beam 21; at the same time, the present invention can avoid the trouble of directly connecting the connector 22 to the external side beam 21 through the setting of the connecting plate assembly 202.

[0092] In the traditional installation method, the rivet nut 2022 is generally directly connected to the external side beam 21. The rivet nut 2022 is easy to fail or be damaged during the transportation or processing of the shell structure, and the damage of the rivet nut 2022 will affect the installation of the connector 22 on the external side beam 21; however, after the shell structure in the battery pack is welded, due to its large size, larger equipment is required for rework, and the tooling size requirements are high, which means it is not easy to rework.

[0093] Therefore, in the traditional use process, the damaged area of ​​the rivet nut 2022 is mostly sealed with glue. This operation method will increase the working hours and material costs and cause waste of resources.

[0094] Moreover, the next step of gluing can only be carried out after the glue is cured, which seriously affects the efficiency of product rework. If the glue after rework is unevenly applied or affected by gravity, there will be problems with poor sealing.

[0095] Therefore, in order to solve the above-mentioned problem, the present invention connects the connector 22 and the external side beam 21 through a connecting plate assembly 202. Even when a rivet nut 2022 is damaged, the overall size of the connecting plate assembly 202 is small, which is convenient for rework and maintenance on the machine tool and replacement of a new rivet nut 2022.

[0096] In the present invention, the connecting plate assembly 202 includes a connecting plate body 2021, on which a rivet nut 2022 is provided; the external side beam 21 is provided with a mounting through hole 211; the connector 22 is connected to the external side beam 21 through the connecting plate assembly 202; in the present invention, the connecting plate body 2021 is a flat plate structure, and a nut mounting hole is provided on the connecting plate body 121, and the rivet nut 2022 is connected in the nut mounting hole; subsequently, the mounting through hole 211 on the external side beam 21 is passed through the plug-in bolt 201 to connect with the rivet nut 2022 on the connecting plate assembly 202, thereby realizing the connection of the connecting plate assembly 202 on the external side beam 21; at the same time, the connector 22 can also be directly connected to the external side beam 21 through the plug-in bolt 201.

[0097] At the same time, in order to ensure the sealing between the connecting plate assembly 202 and the external side beam 21, a sealing gasket is provided on the connecting plate body 2021 in the present invention, and the sealing gasket is attached to the connecting plate body 2021. The setting of the sealing gasket plays a good connection sealing role, thereby ensuring the sealing between the connecting plate assembly 202 and the external side beam 21.

[0098] At the same time, in the present invention, the rivet nut 2022 includes a nut body 2-1, and a nut head 2-2 is provided on the nut body 2-1; the outer diameter of the nut head 2-2 is larger than the outer diameter of the nut body 2-1 at the maximum point; the vertical cross-section of the rivet nut 2022 is T-shaped; a sealing layer is provided at the connection between the nut head 2-2 and the nut body 2-1; the T-shaped structure of the rivet nut 2022 itself has a limiting function, which ensures the stability of the arrangement of the rivet nut 2022 on the connecting plate body 2021; at the same time, the sealing layer 2-3 is arranged at the connection between the nut head 2-2 and the nut body 2-1, and when the rivet nut 2022 is deformed later, the sealing layer 2-3 can fill the gap between the rivet nut 2022 and the connecting plate body 2021, thereby optimizing the sealing effect; in addition, in the present invention, the nut head 2-2 plays a good blocking and limiting role, thereby avoiding excessive extrusion pressure between the connecting plate body 2021 and the external side beam 21 during subsequent assembly, thereby causing the sealing gasket to lose its elasticity.

[0099] At the same time, in the present invention, the connection between the components is generally achieved by using the cooperation between the connecting bolt 5 and the rivet nut 2022 to achieve the installation and fixation between the two components.

[0100] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A PTC device for a battery pack, characterized in that: It includes a plurality of heating units, each of which includes a heating mechanism and a supporting mechanism; the heating mechanism is connected to the battery pack housing through the supporting mechanism; The heating mechanism comprises an aluminum plate, and a PTC heating core is arranged on the aluminum plate; The support mechanism includes a support plate; the aluminum plate is arranged on the support plate; and the support plate is connected to the battery pack housing.

2. A PTC device for a battery pack according to claim 1, characterized in that: The aluminum plate and the support plate are connected via a plug-in mechanism, which includes a plurality of plug-in parts, each of which includes a plug-in column arranged on the aluminum plate and a plug-in hole arranged on the support plate, and the plug-in column is plugged into the support plate via the plug-in hole.

3. A PTC device for a battery pack according to claim 1, characterized in that: The aluminum plate includes a plate body, on which a laying block is provided, and the inside of the laying block is hollow to form a connection channel; the plate body is also provided with a plurality of reinforcing ribs; the plurality of reinforcing ribs are symmetrically distributed on both sides of the laying block; the height of the plug-in column is greater than the thickness of the laying block and the reinforcing ribs.

4. A PTC device for a battery pack according to claim 3, characterized in that: The support plate includes a support plate body; the support plate body includes a base plate; lap plates are provided on both sides of the base plate, and each lap plate is connected to the base plate through a connecting plate; the lap plates and the base plate are parallel and staggered with each other; the connecting plate is arranged perpendicular to the base plate and the lap plates.

5. A PTC device for a battery pack according to claim 4, characterized in that: A silicone pad is laid on the side of the aluminum plate away from the supporting plate; and supporting foam is arranged between the base plate and the laying block.

6. A battery pack assembly, characterized in that: The battery pack comprises a battery pack shell; the battery pack shell comprises a battery pack frame, and the battery pack frame is provided with a PTC device as claimed in claims 1 to 5; the battery cell structure is arranged on the PTC device and fixed on the battery pack frame; the battery pack frame comprises an external frame, and the external frame comprises four external side beams, and the four external side beams are connected in sequence to form a U-shaped distribution; Each of the external side beams comprises a side beam body; the inside of the side beam body is hollow to form a material reduction channel; the side beam body comprises a longitudinal side beam and a transverse side beam; the transverse side beam and the longitudinal side beam are staggered; The battery pack frame further includes a middle support beam, the middle support beam includes a middle beam body, the middle beam body is hollow inside to form a middle material reduction channel; the middle beam body includes a middle longitudinal beam and a middle cross beam; the middle longitudinal beam is arranged perpendicular to the middle cross beam, and the middle beam body has an inverted T-shaped vertical section; The lower end surface of the middle cross beam and the lower end surface of the transverse side beam are in the same plane.

7. A battery pack assembly according to claim 6, characterized in that: When adjacent external side beams are overlapped, a clamping groove is provided at the end of one external side beam, and the transverse side beam in the other external side beam is clamped on the adjacent external side beam through the clamping groove; the clamping groove is at the same height as the transverse side beam.

8. The battery pack assembly according to claim 6, characterized in that: The battery cell structure includes multiple battery cell modules; the multiple battery cell modules are distributed in the battery pack shell; the battery cell module includes a battery cell unit, and the end of the battery cell unit is provided with a module end plate, and the module end plate is connected to the battery pack shell through a fastening component, and the fastening component includes a connecting bolt; the connecting bolt passes through the module end plate and is fixedly connected to the battery pack shell; the battery pack also includes a bridging mechanism, and the bridging mechanism includes a bridging plate, and the bridging plate is overlapped on at least two battery cell modules; the fastening component passes through the bridging plate and is connected to the corresponding battery cell module.

9. A battery pack assembly according to claim 8, characterized in that: The bridge plate includes a longitudinal connecting plate; a transverse support plate is provided on the longitudinal connecting plate, and the bridge plate is overlapped on the module end plate of the corresponding battery cell module through the transverse support plate; the longitudinal connecting plate and the transverse support plate are arranged perpendicular to each other; positioning grooves are provided at the corners of the module end plate; the transverse support plate of each bridge plate is embedded in the positioning groove of the adjacent module end plate; the longitudinal connecting plate is attached to the outer side of the module end plate.

10. A battery pack assembly according to claim 6, characterized in that: A connector is provided on at least one external side beam of the battery pack housing; the connector is connected to the external side beam via a connecting plate assembly; the connecting plate assembly includes a connecting plate body, and a rivet nut is provided on the connecting plate body; The external side beam is provided with a mounting through hole; the connector is connected to the external side beam through a connecting plate assembly.

Images