Power battery pack that is easy to maintain and repair

Abstract

The present invention relates to the field of batteries, and discloses a power battery pack that is easy to maintain and repair, including a battery pack bottom plate, a battery pack box and a battery pack cover, wherein the battery pack bottom plate is installed on the lower surface of the chassis of the whole vehicle, the battery pack box is installed below the battery pack bottom plate, and the battery pack cover is installed on the lower surface of the battery pack box. A battery cell module assembly is placed in the battery pack box, and the battery cell poles of the battery cell module assembly face the battery pack bottom plate. The battery cell module assembly is fastened and connected to the battery pack bottom plate from the bottom surface to the pole surface by bolts, and a high and low voltage connection assembly is provided on the battery pack bottom plate to connect the total positive and total negative of the battery cell module assembly and the low voltage signal acquisition interface of the module, and a water cooling plate is installed between the battery cell module assembly and the battery pack cover through a connector assembly. The power battery pack that is easy to maintain and repair according to the present invention can be quickly disassembled into single cells with low loss, so that the power battery pack is more meticulous in maintenance and more convenient in repair.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a power battery pack that is easy to maintain and repair. Background Art

[0002] In recent years, the number of electric vehicles in the market has increased, and sales have also increased year by year. In the after-sales service of electric vehicles, the speed and convenience of the maintenance and repair of key components, power batteries, have also received more and more attention. Recently, electric vehicles have frequently caught fire and smoke. One of the main reasons is that the on-board power batteries have not been regularly and carefully maintained, resulting in battery problems and accidents.

[0003] At present, most of the power battery packs on the market are manufactured and assembled by means of a large amount of gluing, bonding and packaging, which makes it impossible to disassemble the battery pack without loss, and it is difficult to perform detailed maintenance on the battery pack. Only the information of the entire battery pack can be roughly detected, and maintenance is also difficult to perform. For example, sometimes a single cell in the battery pack has a problem, resulting in the replacement of the module containing this cell. Therefore, if there is a problem with the power battery of an electric vehicle and it needs to be repaired, it often takes at least a week and at most several months to repair, which reduces the user experience and has a certain impact on the popularity of electric vehicles. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned technology and provide a power battery pack that is easy to maintain and repair, which can be quickly disassembled into single cells with low loss, making the power battery pack more meticulous in maintenance and more convenient in repair.

[0005] To achieve the above-mentioned objectives, the power battery pack designed by the present invention is easy to maintain and repair, comprising a battery pack bottom plate, a battery pack case and a battery pack cover, wherein the battery pack bottom plate is installed on the lower surface of the chassis of the whole vehicle, the battery pack case is installed below the battery pack bottom plate, and the battery pack cover is installed on the lower surface of the battery pack case, a battery cell module assembly is placed in the battery pack case, the battery cell poles of the battery cell module assembly face the battery pack bottom plate, the battery cell module assembly is fastened to the battery pack bottom plate by bolts from the bottom surface to the pole surface, a high and low voltage connection assembly connecting the total positive and total negative of the battery cell module assembly and the low-voltage signal acquisition interface of the module is provided on the battery pack bottom plate, and a water cooling plate is placed between the battery cell module assembly and the battery pack cover.

[0006] Preferably, the battery cell module assembly includes a plurality of battery module combinations, each of the battery module combinations includes two single modules placed side by side, the total positive and total negative of the single modules are respectively located at the two ends of the single modules, wherein one end of the battery module combination is provided with a total positive of the single module and a total negative of another single module, and the total positive and total negative of each battery module combination are connected at this point through a single connecting copper bus, and the other end of the battery module combination is provided with a total negative of the single module and a module low-voltage signal acquisition interface and a total positive and module low-voltage signal acquisition interface of another single module. Because they are all on the same side of the battery module combination, the installation of the high voltage connection assembly and the low voltage acquisition module in the high and low voltage connection assembly is convenient, safety is increased, and costs are saved. The total positive, total negative and module low-voltage signal acquisition interfaces at this point of the battery module combination are connected to the high and low voltage connection assembly.

[0007] Preferably, the single module includes a plurality of fixing frames for placing single battery cells, the fixing frames include an upper fixing frame wrapping the upper end of the battery cell and a lower fixing frame wrapping the lower end of the battery cell, side protection plates are provided on the two narrow sides of the battery cell, and latches are provided on the upper and lower ends of the side protection plates, the downward frame opening of the upper fixing frame is provided with a slot matching the latch, and the upward frame opening of the lower fixing frame is provided with a slot matching the latch, and the two ends of the side protection plate are inserted into the upper fixing frame and the lower fixing frame through the latch and the slot, the fixing frames are placed side by side to form a fixing frame group, the fixing frame group is located at the upper fixing frame position and is wrapped with a steel tie, and the fixing frame group is located at the lower fixing frame position and is wrapped with a steel tie, and the steel tie is locked with long bolts and nuts.

[0008] Preferably, the monomer module is provided with an adapter device for electrically connecting the battery cells, the adapter device includes a welding assembly and an adapter assembly, the adapter assembly includes an adapter plate and a plurality of collection plate pins installed on the adapter plate by rotary rivets, the tail of the adapter plate is connected to a plurality of plug-in plates, the plug-in plates are bent downward to be parallel to the adapter plate, the welding assembly includes a welding portion welded to the battery cell pole and a connecting portion connected to the adapter assembly, the connecting portion is provided with a spring sheet and an adapter upper aluminum sheet in sequence from bottom to top, the connecting portion, the spring sheet and the adapter upper aluminum sheet are fixedly connected by four double-headed rivets arranged at four corners, the middle portion of the spring sheet is concave to form a spring sheet groove, a gap is left between the bottom of the spring sheet groove and the connecting portion, and the distance of the gap is less than the distance of the gap. The thickness of the plug at the bottom of the adapter assembly, the center position of the spring groove is provided with a protrusion for fixing one end of the spring, the other end of the spring is sleeved with a positioning pin, the upper aluminum sheet of the adapter is provided with a first positioning hole that cooperates with the positioning pin, and the adapter assembly is provided with a second positioning hole corresponding to the first positioning hole. The welding assembly is welded to the battery cell pole and is taken out together with the battery cell when the battery cell needs to be replaced and maintained. The adapter assembly is compacted with the welding assembly using the positioning pin and the spring, and can be directly taken down when the battery cell is replaced and can be reused. Using this device, any single battery cell in the module can be taken out separately with low loss for maintenance or repair, thereby not affecting the use of other normal battery cells in the module, reducing costs, making maintenance more precise, and improving repair efficiency.

[0009] Preferably, the high and low voltage connection assembly is crimped with the total positive, total negative and module low voltage signal acquisition interfaces of the battery module combination by elastic means without the need for bolts.

[0010] Preferably, a plurality of guide posts and guide grooves are provided on the two wide sides of the upper fixed frame, and the two adjacent upper fixed frames are connected by the cooperation of the guide posts and the guide grooves. The guide posts and the guide grooves can make installation more convenient and have a certain anti-fool and anti-error effect. A low-voltage collection sheet pad is provided in the middle of the upper surface of the upper fixed frame, and a low-voltage collection integrated sheet for collecting various information of the module can be placed after grouping. An exhaust hole is provided under the low-voltage collection sheet pad, and when there is exhaust gas from the battery cell, it can be discharged smoothly to reduce safety hazards. A plurality of heat dissipation holes are provided on the side protective plate, and the diameter of the heat dissipation hole is small The thickness of the battery cell is 1.5mm, which can prevent large foreign particles from entering the module and scratching the blue film of the battery cell while ensuring that the heat dissipation is not affected, thereby reducing the risk of module short circuit. The lower surface of the lower fixed frame is concave, and its function is to leave space for placing heat-conducting materials between the bottom of the battery cell and the water-cooling plate, so that the battery cell can dissipate heat better and increase safety. Fixed end plates are provided at both ends of the fixed frame group, and a plurality of guide columns and guide grooves are provided on the side of the fixed end plate facing the fixed frame group. The fixed end plate is fixed to the fixed frame group through the cooperation of the guide columns and the guide grooves, which can effectively protect the battery module combination.

[0011] Preferably, the number of the plugs matches the number of series and parallel connections of the battery cells, and the number of the acquisition sheet pins is equal to the number of the plugs. Different forms such as two-link, three-link, five-link, six-link, etc. can be designed according to actual needs, as long as the number of the plugs and the number of acquisition sheet pins are increased or decreased.

[0012] Preferably, a module cover is provided on the upper surface of the single module, the module cover has the functions of insulation, pressure resistance and flame retardancy, and protects the electrical connection part of the battery module combination. The module cover is connected to the upper fixed frame by a snap-fit ​​structure.

[0013] Preferably, the battery pack box is provided with an explosion-proof vent valve and a connector assembly.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The entire battery pack is manufactured without structural adhesive, and all connections are fastened with bolts and nuts, which is convenient and quick. Especially when maintenance and repair are required, it greatly shortens the time, improves efficiency, saves costs, improves user experience, and also promotes the popularization of electric vehicles;

[0016] 2. The electrical connection part of the module adopts a combination of traditional welding and innovative transfer, so that the battery cells in the module can be taken out separately. In this way, problems can be found more accurately during maintenance and repair, which greatly reduces the loss, reduces the cost, improves the maintenance and repair efficiency, and greatly reduces the maintenance and repair time;

[0017] 3. The single cell can be disassembled quickly and with low loss, making the power battery pack more meticulous in maintenance and more convenient in repair;

[0018] 4. When the battery pack is installed on the vehicle, it is inverted, that is, the upper cover faces the ground, and the bottom plate is fastened to the place where the battery pack is placed on the chassis of the vehicle. When repairing the battery pack, there is no need to remove the entire battery pack. You only need to lift the vehicle and remove the upper cover from the bottom of the vehicle to inspect and repair the inside of the battery pack, which is convenient and quick;

[0019] 5. Breaking the battery pack box into smaller pieces will make the manufacturing of the box simpler and the transportation of the box more convenient. The combination of the two can greatly save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a power battery pack that is easy to maintain and repair according to the present invention;

[0021] Figure 2 This is a schematic diagram of the present invention being installed on the lower surface of a vehicle chassis;

[0022] Figure 3 for Figure 1 Installation diagram of the CEC core module assembly;

[0023] Figure 4 for Figure 3 Schematic diagram of total positive and negative of the battery module combination;

[0024] Figure 5 for Figure 3 Schematic diagram of the structure of the medium monomer module;

[0025] Figure 6 for Figure 5 The structural diagram of the fixed frame in the figure;

[0026] Figure 7 for Figure 5 Schematic diagram of the pole connection of the battery cell;

[0027] Figure 8 for Figure 7 A schematic diagram of the structure of the intermediate transfer assembly;

[0028] Fig. 9 for Figure 8 Exploded view of the transfer assembly;

[0029] Fig.10 for Figure 7 Schematic diagram of the structure of the welding assembly;

[0030] Fig.11 for Fig.10 Exploded view of a welded assembly.

[0031] The components in the figure are numbered as follows:

[0032] Battery pack bottom plate 1, battery pack box 2, battery pack cover 3, battery cell module assembly 4, total positive 5, total negative 6, module low voltage signal acquisition interface 7, high and low voltage connection assembly 8, connector assembly 9, water cooling plate 10, battery module combination 11, single module 12, single connection copper bar 13, battery cell 14, fixed frame 15, upper fixed frame 16, lower fixed frame 17, side protection plate 18, pin 19, slot 20, fixed frame group 21, steel tie 22, adapter 23, welding assembly 24, adapter assembly 25, adapter plate 26, spin rivet 27, collection plate pin 28, insert 29, welding part 30, connecting part 31, spring 32, adapter upper aluminum plate 33, double-head rivet 34, spring groove 35, spring 36, locating pin 37, first locating hole 38, second locating hole 39, guide column 40, guide groove 41, low-pressure collection plate pad 42, exhaust hole 43, heat dissipation hole 44, fixed end plate 45, module cover 46, explosion-proof air valve 47, bolt 48. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the power battery pack of the present invention is easy to maintain and repair, including a battery pack bottom plate 1, a battery pack case 2 and a battery pack cover 3, the battery pack bottom plate 1 is installed on the lower surface of the whole vehicle chassis, the battery pack case 2 is installed below the battery pack bottom plate 1, the battery pack case 2 is provided with an explosion-proof vent valve 47 and a connector assembly 9, the battery pack cover 3 is installed on the lower surface of the battery pack case 2, a battery cell module assembly 4 is placed in the battery pack case 2, the battery cell poles of the battery cell module assembly 4 face the battery pack bottom plate 1, the battery cell module assembly 4 is fastened to the battery pack bottom plate 1 from the bottom surface to the pole surface by bolts 48, the battery pack bottom plate 1 is provided with a high and low voltage connection assembly 8 connecting the total positive 5 and the total negative 6 of the battery cell module assembly 4 and the module low voltage signal acquisition interface 7, and a water cooling plate 10 is placed between the battery cell module assembly 1 and the battery pack cover 3.

[0035] like Figure 1 As shown, the battery module assembly 4 includes a plurality of battery module combinations 11, combined with Figure 3 As shown, each battery module assembly 11 includes two single modules 12 placed side by side, combined with Figure 4As shown, the total positive 5 and total negative 6 of the monomer module 12 are respectively located at the two ends of the monomer module 12, wherein one end of the battery module combination 11 is provided with a total positive 5 of a monomer module 12 and a total negative 6 of another monomer module 12, and the total positive 5 and total negative 6 of each battery module combination 11 are connected by a monomer connection copper bar 13, and the other end of the battery module combination 11 is provided with a total negative 6 of a monomer module 12 and a module low-voltage signal acquisition interface 7 and a total positive 5 and a module low-voltage signal acquisition interface 7 of another monomer module 12, and the total positive 5, total negative 6 and module low-voltage signal acquisition interface 7 of the battery module combination 11 are connected to the high-low voltage connection assembly 8, and the high-low voltage connection assembly 8 and the total positive 5, total negative 6 and module low-voltage signal acquisition interface 7 of the battery module combination 11 are crimped by an elastic device. In addition, in this embodiment, a module cover 46 is provided on the upper surface of the monomer module 12, and the module cover 46 is connected to the upper fixed frame 16 by a snap-fit ​​structure.

[0036] Combination Figure 5 and Figure 6 As shown, the single module 12 includes a plurality of fixing frames 15 for placing single battery cells 14, the fixing frames 15 include an upper fixing frame 16 wrapping the upper end of the battery cell 14 and a lower fixing frame 17 wrapping the lower end of the battery cell 14, side protection plates 18 are provided on the two narrow sides of the battery cell 14, and latches 19 are provided at the upper and lower ends of the side protection plates 18, a slot 20 matching the latch 19 is provided on the downward frame opening of the upper fixing frame 16, and a slot 20 matching the latch 19 is provided on the upward frame opening of the lower fixing frame 17, and both ends of the side protection plate 18 are inserted into the upper fixing frame 16 and the lower fixing frame 17 through the latch 19 and the slot 20, and the fixing frames 15 are placed side by side to form a fixing frame group 21, and the fixing frame group 21 is located at the upper fixing frame 16 and is wrapped with a steel tie 22, and the fixing frame group 21 is located at the lower fixing frame 17 and is wrapped with a steel tie 22, and the steel tie 22 is locked with long bolts and nuts.

[0037] Among them, a plurality of guide columns 40 and guide grooves 41 are provided on the two wide sides of the upper fixed frame 16, and the two adjacent upper fixed frames 16 are connected by the cooperation of the guide columns 40 and the guide grooves 41. A low-pressure collection plate pad 42 is provided in the middle of the upper surface of the upper fixed frame 16, and an exhaust hole 43 is provided below the low-pressure collection plate pad 42. A plurality of heat dissipation holes 44 are provided on the side protection plate 18, and the diameter of the heat dissipation holes 44 is less than 1.5 mm. The lower surface of the lower fixed frame 17 is concave, and fixed end plates 45 are provided at both ends of the fixed frame group 21. A plurality of guide columns 40 and guide grooves 41 are provided on the side of the fixed end plate 45 facing the fixed frame group 21, and the fixed end plate 45 is fixed to the fixed frame group 21 by the cooperation of the guide columns 40 and the guide grooves 41.

[0038] like Figure 7As shown, the single module 12 is provided with a switching device 23 for electrically connecting the battery cell 14, and the switching device 23 includes a welding component 24 and a switching component 25. Figure 8 and Fig. 9 As shown, the adapter assembly 25 includes an adapter plate 26 and a plurality of acquisition plate pins 28 mounted on the adapter plate 26 by means of a rivet 27. A plurality of plug-in plates 29 are connected to the tail of the adapter plate 26. The number of plug-in plates 29 matches the number of series and parallel connections of the battery cells 14. The number of acquisition plate pins 28 and plug-in plates 29 is equal. In this embodiment, the number of acquisition plate pins 28 and plug-in plates 29 are both 4. The plug-in plates 29 are bent downward to be parallel to the adapter plate 26. Fig.10 and Fig.11 As shown, the welding assembly 24 includes a welding portion 30 welded on the battery cell pole and a connecting portion 31 connected to the adapter assembly 25. The connecting portion 31 is provided with a spring sheet 32 ​​and an adapter upper aluminum sheet 33 from bottom to top in sequence. The connecting portion 31, the spring sheet 32 ​​and the adapter upper aluminum sheet 33 are fixedly connected by four double-headed rivets 34 arranged at four corners. The middle part of the spring sheet 32 ​​is concave to form a spring sheet groove 35. A gap is left between the bottom of the spring sheet groove 35 and the connecting portion 31. The distance of the gap is less than the thickness of the plug 29 at the bottom of the adapter assembly 25. A protrusion is provided at the center of the spring sheet groove 35 to fix one end of the spring 36. A positioning pin 37 is sleeved on the other end of the spring 36. A first positioning hole 38 cooperating with the positioning pin 37 is opened on the adapter upper aluminum sheet 33, and a second positioning hole 39 corresponding to the first positioning hole 38 is opened on the adapter assembly 25.

[0039] When this embodiment is used, the battery pack bottom plate 1, the battery pack box 2 and the battery pack cover 3 are connected by bolts, and the protection level of IP67 and above is achieved by technological means. When the battery pack is installed on the whole vehicle, it is inverted, that is, the battery pack cover 3 faces the ground, and the battery pack bottom plate 1 is fastened to the place where the battery pack is placed on the chassis of the whole vehicle. In this way, when repairing the battery pack, it is not necessary to disassemble the entire battery pack. You only need to lift the car, and people can remove the battery pack cover 3 under the car, and then you can check and repair the inside of the battery pack, which is convenient and quick. In addition, in this embodiment, the total positive 5 and total negative 6 at one end of the two single modules 12 in the battery module combination 11 are first connected in series with a single connection copper bar 13 before packaging, and the high and low voltage connection assembly 8 is fixed on the battery pack bottom plate 1 at the beginning. After the battery module combination 11 is installed and fastened on the battery pack bottom plate 1, its total positive 5 and total negative 6 high-voltage output ends can be pressed. When installing the adapter device 23, insert the insert 29 into the gap between the bottom of the spring groove 35 in the welding component 24 and the connecting portion 31, and the second positioning hole 39 on the adapter component 25 cooperates with the positioning pin 37 in the welding component 24. When the adapter component 25 is pushed into the welding component 24 from the side, the positioning pin 37 pops out from the first positioning hole 38 and the second positioning hole 39, indicating that the assembly is successful.

[0040] The disassembly process of this embodiment is as follows: If the power battery pack in the present invention needs maintenance and repair, first use technical means to detect which single module 12 in the battery pack has a problem, then the car can be lifted up, the maintenance switch can be turned on, and a person can remove the battery pack cover 3 from the bottom of the car, and the other parts are left on the car. Then the high-voltage electrical connection bolts and the fixing bolts at the four corners on the single module 12 are removed, so that a single problematic single module 12 can be taken out, and then further detection can be made of which battery cell in the module has a problem, and then tools can be used to remove the adapter part on the electrical connection device, and the single battery cell can be taken out for repair or replacement, which is convenient and fast, with low loss rate and cost saving.

[0041] The power battery pack of the present invention is easy to maintain and repair. The entire battery pack is manufactured without structural adhesive and is fastened with bolts and nuts, which is convenient and quick. Especially when maintenance and repair are needed, the time is greatly shortened, the efficiency is improved, the cost is saved, the user experience is improved, and the popularization of electric vehicles is also promoted. The electrical connection part of the module adopts a combination of traditional welding and innovative switching, so that the battery cells in the module can be taken out separately, so that in the process of maintenance and repair, problems can be found more accurately, the loss therein is greatly reduced, the cost is reduced, the maintenance and repair efficiency is improved, and the maintenance and repair time is greatly reduced. In addition , the single battery cell can be disassembled quickly with low loss, making the power battery pack more meticulous in maintenance and more convenient in repair; in the present invention, the battery pack is installed on the whole vehicle in an inverted form, that is, the upper cover faces the ground, and the bottom plate is fastened to the place where the battery pack is placed on the chassis of the whole vehicle. When repairing the battery pack, there is no need to disassemble the entire battery pack. It is only necessary to lift the vehicle and remove the upper cover from the bottom of the vehicle, so that the inside of the battery pack can be inspected and repaired, which is convenient and quick; and the battery pack box is broken into parts, which is simpler for the manufacture of the box and more convenient for the transportation of the box. The combination of the two can greatly save costs.

Claims

1. A power battery pack that is easy to maintain and repair, comprising a battery pack bottom plate (1), a battery pack box (2) and a battery pack upper cover (3), characterized in that: The battery pack bottom plate (1) is mounted on the lower surface of the vehicle chassis, the battery pack case (2) is mounted below the battery pack bottom plate (1), the battery pack upper cover (3) is mounted on the lower surface of the battery pack case (2), a battery cell module assembly (4) is placed in the battery pack case (2), the battery cell poles of the battery cell module assembly (4) face the battery pack bottom plate (1), the battery cell module assembly (4) is fastened to the battery pack bottom plate (1) from the bottom surface to the pole surface by bolts, the battery pack bottom plate (1) is provided with a high and low voltage connection assembly (8) connecting the total positive (5) and total negative (6) of the battery cell module assembly (4) and the module low voltage signal acquisition interface (7), and a water cooling plate (10) is placed between the battery cell module assembly (1) and the battery pack upper cover (3); The battery cell module assembly (4) comprises a plurality of battery module combinations (11), each of the battery module combinations (11) comprising two single modules (12) placed side by side, the total positive (5) and the total negative (6) of the single module (12) being located at the two ends of the single module (12), respectively, wherein one end of the battery module combination (11) is provided with the total positive (5) of the single module (12) and the total negative (6) of the other single module (12), and each of the battery module combinations (11) is provided with the total positive (5) of the single module (12) and the total negative (6) of the other single module (12). ) the total positive (5) and the total negative (6) are connected via a single-cell connection copper bar (13); the other end of the battery module assembly (11) is provided with a total negative (6) of the single-cell module (12) and a module low-voltage signal acquisition interface (7) and another total positive (5) and a module low-voltage signal acquisition interface (7) of the single-cell module (12); the total positive (5), the total negative (6) and the module low-voltage signal acquisition interface (7) of the battery module assembly (11) are connected to the high- and low-voltage connection assembly (8); The single module (12) comprises a plurality of fixing frames (15) for placing single battery cells (14), the fixing frames (15) comprising an upper fixing frame (16) wrapping the upper end of the battery cell (14) and a lower fixing frame (17) wrapping the lower end of the battery cell (14), side protection plates (18) are provided on both narrow sides of the battery cell (14), and latches (19) are provided at both upper and lower ends of the side protection plates (18), a slot (20) cooperating with the latch (19) is provided at a downward frame opening of the upper fixing frame (16), and a slot (20) cooperating with the latch (19) is provided at an upward frame opening of the lower fixing frame (17). A slot (20) cooperating with the latch (19) is provided on the frame opening, and the two ends of the side protection plate (18) are inserted into the upper fixed frame (16) and the lower fixed frame (17) through the latch (19) and the slot (20). The fixed frames (15) are placed side by side to form a fixed frame group (21). The fixed frame group (21) is located at the position of the upper fixed frame (16) and is wrapped with a steel tie (22). The fixed frame group (21) is located at the position of the lower fixed frame (17) and is wrapped with a steel tie (22). The steel tie (22) is locked with a long bolt and a nut. The monomer module (12) is provided with an adapter device (23) for electrically connecting the battery cell (14), the adapter device (23) comprising a welding assembly (24) and an adapter assembly (25), the adapter assembly (25) comprising an adapter sheet (26) and a plurality of collection sheet plugs (28) mounted on the adapter sheet (26) by means of riveting rivets (27), the tail of the adapter sheet (26) being connected with a plurality of plugs (29), the plugs (29) being bent downward to be parallel to the adapter sheet (26), the welding assembly (24) comprising a welding portion (30) welded on the battery cell pole and a connecting portion (31) connected to the adapter assembly (25), the connecting portion (31) being provided with a spring sheet (32) and an adapter upper aluminum sheet (33) in sequence from bottom to top, the connecting portion (31) The part (31), the spring sheet (32) and the transition upper aluminum sheet (33) are fixedly connected by four double-headed rivets (34) arranged at four corners. The middle part of the spring sheet (32) is concave to form a spring sheet groove (35). A gap is left between the bottom of the spring sheet groove (35) and the connecting part (31). The distance of the gap is less than the thickness of the insert (29) at the lower part of the transition component (25). A protrusion for fixing one end of a spring (36) is provided at the center position of the spring sheet groove (35). The other end of the spring (36) is sleeved with a positioning pin (37). A first positioning hole (38) cooperating with the positioning pin (37) is opened on the transition upper aluminum sheet (33), and a second positioning hole (39) corresponding to the first positioning hole (38) is opened on the transition component (25); The high and low voltage connection assembly (8) is crimped with the total positive (5), total negative (6) and module low voltage signal acquisition interface (7) of the battery module combination (11) via an elastic device.

2. The power battery pack that is easy to maintain and repair according to claim 1 is characterized in that: A plurality of guide columns (40) and guide grooves (41) are provided on both wide sides of the upper fixed frame (16), and two adjacent upper fixed frames (16) are connected by the cooperation of the guide columns (40) and the guide grooves (41). A low-pressure collection plate pad (42) is provided in the middle of the upper surface of the upper fixed frame (16), and an exhaust hole (43) is provided below the low-pressure collection plate pad (42). A plurality of heat dissipation holes (44) are provided on the side protection plate (18), and the diameter of the heat dissipation hole (44) is less than 1.5 mm. The lower surface of the lower fixed frame (17) is concave. Fixed end plates (45) are provided at both ends of the fixed frame group (21), and a plurality of guide columns (40) and guide grooves (41) are provided on a side of the fixed end plate (45) facing the fixed frame group (21), and the fixed end plate (45) is fixed to the fixed frame group (21) by the cooperation of the guide columns (40) and the guide grooves (41).

3. The power battery pack that is easy to maintain and repair according to claim 1 is characterized in that: The number of the plug-ins (29) matches the number of series-parallel connections of the battery cells (14), and the number of the acquisition sheet plug pins (28) is equal to the number of the plug-ins (29).

4. The power battery pack that is easy to maintain and repair according to claim 1 is characterized in that: The upper surface of the single module (12) is provided with a module upper cover (46), and the module upper cover (46) is connected to the upper fixing frame (16) by means of a snap-fit ​​structure.

5. The power battery pack that is easy to maintain and repair according to claim 1 is characterized in that: The battery pack box (2) is provided with an explosion-proof vent valve (47) and a connector assembly (9).

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