Power battery pack

Abstract

The invention belongs to the technical field of batteries, and discloses a power battery pack, the power battery pack comprises a plurality of single batteries, a box body assembly and an electric control module, the box body assembly comprises a lower box body and a protective end cover, the lower box body is provided with a containing groove, the protective end cover is arranged at an opening of the containing groove to form a containing cavity for containing the single batteries in the axial direction, and the electric control module is arranged in the containing cavity. The lower box body is further provided with a limiting groove and a glue pouring structure used for communicating the limiting groove with the containing cavity, the electric control module is arranged on the lower box body, a part of the electric control module is contained in the limiting groove, and the electric control module is used for managing the multiple single batteries. The limiting groove and the containing cavity are communicated through the glue pouring structure, so that synchronous fixing and insulating sealing can be performed on the single battery in the containing cavity and the part, contained in the limiting groove, of the electric control module at the same time when the structural glue is poured, the number of parts for fixing and sealing is greatly reduced, the assembly process is simplified, and the assembly efficiency is improved. And the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a power battery pack. Background Art

[0002] At present, new energy vehicles are receiving more and more attention from the society. The cost of electric vehicles is a widely concerned issue among OEMs, battery manufacturers and consumers. Battery packs are a component that accounts for a relatively high proportion of the cost of electric vehicles. Reducing the cost of battery packs plays an extremely important role. Therefore, the market is gradually placing higher and higher requirements on the energy density of battery packs and the space utilization inside the battery packs.

[0003] The vehicle-mounted battery pack is affected by factors such as vibration in its use environment. The single cells and electronic control modules in the vehicle-mounted battery pack may become loose or damaged due to vibration, thereby creating safety hazards during use. Therefore, in order to ensure the safety of the vehicle-mounted battery pack, a large number of fixings and seals are usually provided to fix and insulate the single cells and electronic control modules in the vehicle-mounted battery pack to ensure their safety and protection during use, resulting in a large number of components in the system, which not only increases the manufacturing cost, but also makes the assembly process very cumbersome. Summary of the invention

[0004] The object of the present invention is to provide a power battery pack with a small number of parts, a simple assembly process and a low manufacturing cost.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A power battery pack is provided, the power battery pack comprising:

[0007] Multiple single cells;

[0008] A box assembly, the box assembly comprising a lower box and a protective end cover, one side of the lower box is provided with accommodating grooves corresponding to the plurality of single cells and independent of each other, the protective end cover is arranged at the opening of the accommodating groove to close the accommodating groove to form an accommodating cavity for accommodating the single cells in the axial direction, the side of the lower box away from the protective end cover is also provided with a limiting groove corresponding to the accommodating cavity, the lower box is also provided with a glue injection structure, the glue injection structure is used to connect the limiting groove with the accommodating cavity;

[0009] An electric control module, a part of which is arranged on the lower box body, and another part of which is accommodated in the limiting groove, and the electric control module is used to manage the plurality of single cells.

[0010] Optionally, the glue pouring structure includes a glue guiding groove, a glue injection port and a connecting port, the glue guiding groove is arranged on the groove wall of the accommodating groove, the glue injection port and the connecting port are both arranged in the limiting groove, the glue injection port is used to connect the limiting groove and the accommodating cavity, and the connecting port is used to connect the limiting groove and the glue guiding groove.

[0011] Optionally, the protective end cover includes a closing portion and an abutting portion, the closing portion is arranged at the opening of the accommodating groove to close the accommodating groove, the abutting portion is inserted into the accommodating groove to abut against the single battery, and a glue bin connected to the glue guiding groove is formed between the abutting portion and the groove wall of the accommodating groove.

[0012] Optionally, the glue pouring structure further includes a glue overflow groove, which is disposed on a groove wall of the containing groove and is communicated with the glue bin.

[0013] Optionally, the glue overflow groove and the glue guiding groove are symmetrically distributed on the groove wall of the accommodating groove.

[0014] Optionally, the protective end cover is further provided with an exhaust cavity penetrating the abutting portion, and the closed portion is provided with a weakening structure on one side facing the abutting portion, the thickness of the weakening structure is smaller than the thickness of other parts of the protective end cover, and the weakening structure is located in the area of ​​the closed portion covered by the exhaust cavity.

[0015] Optionally, the electric control module includes a collection board group and a BMS assembly, the BMS assembly is arranged on the upper surface of the lower box body, a part of the collection board group is integrated on the upper surface of the lower box body and electrically connected to the BMS assembly, and another part of the collection board group is integrated in the limiting groove and electrically connected to the single battery.

[0016] Optionally, the electric control module further includes a temperature sensor, a mounting through hole is provided on a side of the lower box body facing the BMS assembly, one side of the temperature sensor is connected to the BMS assembly, and the other side of the temperature sensor passes through the mounting through hole and abuts against the single battery.

[0017] Optionally, the box assembly further includes a box upper cover, which is disposed on a side of the BMS assembly facing away from the lower box, a mounting slot is provided on a side of the lower box facing the box upper cover, and a plug-in protrusion is provided on a side of the box upper cover facing the lower box, and the plug-in protrusion is inserted into the mounting slot.

[0018] Optionally, the collection plate group and the lower box are integrated into an integral structure by injection molding.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a power battery pack, which accommodates a part of an electric control module arranged on a lower box body in a limiting groove, and provides a glue injection structure for connecting a receiving cavity and the limiting groove on the lower box body, so that when performing a glue injection operation, the structural glue can be simultaneously filled in the limiting groove and the receiving cavity through the glue injection structure, thereby achieving synchronous fixation and insulation sealing of a single battery located in the receiving cavity and a part of the electric control module accommodated in the limiting groove. Compared with a traditional battery pack, the number of components used for insulation and fixation is reduced, which not only reduces the manufacturing cost by reducing the number of components, but also simplifies the steps of the assembly process by reducing the number of components, thereby improving the efficiency of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural exploded diagram of the power battery pack provided by the present invention;

[0022] Figure 2 It is a structural assembly diagram of the power battery pack provided by the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the lower box body in the power battery pack provided by the present invention;

[0024] Figure 4 It is a schematic diagram of the planar structure of the lower box body in the power battery pack provided by the present invention;

[0025] Figure 5 It is a schematic diagram of the connection structure between a single cell and a structural adhesive in a power battery pack provided by the present invention;

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the protective end cover in the power battery pack provided by the present invention;

[0027] Figure 7 It is a partial structural schematic diagram of a BMS assembly with a temperature sensor integrated in the power battery pack provided by the present invention.

[0028] In the figure:

[0029] 1. Single battery;

[0030] 2. Box assembly; 21. Lower box; 211. Accommodating groove; 212. Limiting groove; 213. Glue guide groove; 214. Glue injection port; 215. Connecting port; 216. Glue overflow groove; 217. Installation slot; 22. Protective end cover; 221. Closing part; 222. Abutting part; 223. Exhaust cavity; 224. Weakened structure; 23. Box upper cover; 231. Insertion protrusion;

[0031] 3. Electric control module; 31. Acquisition board group; 311. Series bar; 312. BMS positive input bar; 313. BMS positive output bar; 314. BMS negative input bar; 315. BMS negative output bar; 32. BMS assembly; 33. Temperature sensor;

[0032] 4. Structural adhesive; 41. First limiting column; 42. Bottom adhesive ring; 43. Second limiting column. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] At present, new energy vehicles are receiving more and more attention from the society. The cost of electric vehicles is a widely concerned issue among OEMs, battery manufacturers and consumers. Battery packs are a component that accounts for a relatively high proportion of the cost of electric vehicles. Reducing the cost of battery packs plays an extremely important role. Therefore, the market is gradually placing higher and higher requirements on the energy density of battery packs and the space utilization inside the battery packs.

[0038] The vehicle-mounted battery pack is affected by factors such as vibration in its use environment. The single cells and electronic control modules in the vehicle-mounted battery pack may become loose or damaged due to vibration, thereby creating safety hazards during use. Therefore, in order to ensure the safety of the vehicle-mounted battery pack, a large number of fixings and seals are usually provided to fix and insulate the single cells and electronic control modules in the vehicle-mounted battery pack to ensure their safety and protection during use, resulting in a large number of components in the system, which not only increases the manufacturing cost, but also makes the assembly process very cumbersome.

[0039] Therefore, in order to reduce manufacturing costs, simplify assembly processes, and improve assembly efficiency, this embodiment provides a power battery pack.

[0040] like Figures 1 to 7 As shown, the power battery pack includes a plurality of single cells 1, a box assembly 2 and an electronic control module 3. The box assembly 2 includes a lower box 21 and a protective end cover 22. One side of the lower box 21 is provided with accommodating grooves 211 corresponding to the plurality of single cells 1 and independent of each other. The protective end cover 22 is arranged at the opening of the accommodating groove 211 to close the accommodating groove 211 to form an accommodating cavity for accommodating the single cells 1 along the axial direction. A limiting groove 212 corresponding to the accommodating cavity is also arranged on the side of the lower box 21 away from the protective end cover 22. The lower box 21 is also provided with a glue injection structure, which is used to connect the limiting groove 212 with the accommodating cavity. The electronic control module 3 is arranged on the lower box 21, and a part of the electronic control module 3 is accommodated in the limiting groove 212. The electronic control module 3 is used to manage the plurality of single cells 1.

[0041] The power battery pack accommodates a part of the electric control module 3 arranged on the lower box 21 in the limiting groove 212, and provides a glue injection structure for connecting the accommodating cavity and the limiting groove 212 on the lower box 21, so that when performing the glue injection operation, the structural glue 4 can be simultaneously filled in the limiting groove 212 and the accommodating cavity through the glue injection structure, so as to achieve synchronous fixation and insulation sealing of the single battery 1 located in the accommodating cavity and the part of the electric control module 3 accommodated in the limiting groove 212, thereby reducing the number of parts used for insulation and fixation compared with the traditional battery pack, not only reducing the production cost by reducing the number of parts, but also streamlining the steps of the assembly process by reducing the number of parts, thereby improving the assembly efficiency. In this embodiment, the single battery 1 in the power battery pack is a 12V large cylindrical battery.

[0042] Alternatively, if Figure 3 , Figure 4 , Figure 5 As shown, the glue pouring structure includes a glue guiding groove 213, a glue injection port 214 and a connecting port 215. The glue guiding groove 213 is arranged on the groove wall of the accommodating groove 211, and the glue injection port 214 and the connecting port 215 are both arranged in the limiting groove 212. The glue injection port 214 is used to connect the limiting groove 212 and the accommodating cavity, and the connecting port 215 is used to connect the limiting groove 212 and the glue guiding groove 213. By arranging a glue injection port 214 and a connecting port 215 in the limiting groove 212, and arranging a glue guiding groove 213 connected with the limiting groove 212 through the connecting port 215 on the groove wall of the receiving groove 211, when the structural glue 4 is injected, the structural glue 4 fixes and insulates the end of the single battery 1 through the glue injection port 214 and then overflows into the limiting groove 212, and then flows along the limiting groove 212 through the connecting port 215 and finally flows into the glue guiding groove 213. On the one hand, the glue guiding groove 213 guides the flow of the structural glue 4 inside the receiving cavity, and on the other hand, after the glue injection is completed, the structural glue 4 solidifies in the glue guiding groove 213, and a first limiting column 41 is formed to limit the single battery 1 accommodated in the receiving cavity to prevent the single battery 1 from shifting in the receiving cavity. The number of the glue guiding grooves 213 can be freely set according to the requirements. In the present embodiment, two glue guiding grooves 213 are provided in each accommodating cavity, and each glue guiding groove 213 is provided with a connecting port 215 connected with the limiting groove 212 .

[0043] Alternatively, if Figure 6 As shown, the protective end cover 22 includes a closing portion 221 and an abutting portion 222. The closing portion 221 is arranged at the opening of the receiving groove 211 to close the receiving groove 211. The abutting portion 222 is inserted into the receiving groove 211 to abut against the single battery 1. A glue bin connected to the glue guide groove 213 is formed between the abutting portion 222 and the groove wall of the receiving groove 211. By using the closing portion 221 and the abutting portion 222 to form the protective end cover 22, the protective end cover 22 can seal the opening of the receiving groove 211 on the one hand, and limit and fix the single battery 1 through the abutting portion 222 on the other hand, so as to prevent the single battery 1 from shifting in the receiving groove 211. At the same time, a glue tank connected to the glue guide groove 213 is formed between the abutment portion 222 and the groove wall of the accommodating groove 211, so that when pouring glue, the structural glue 4 flows into the glue tank and forms a bottom glue ring 42 after solidification. On the one hand, the protective end cover 22 is connected and fixed in the accommodating groove 211 to achieve the connection between the protective end cover 22 and the lower box body 21, and on the other hand, it can also play the role of insulation protection and buffer protection.

[0044] Alternatively, if Figure 3 , Figure 4 , Figure 5As shown, the glue filling structure also includes a glue overflow groove 216, which is provided on the groove wall of the receiving groove 211 and is connected to the glue bin. By providing the glue overflow groove 216 connected to the glue bin on the side wall of the receiving groove 211, on the one hand, the flow of the structural glue 4 overflowing from the glue bin in the internal flow of the receiving cavity is guided, and on the other hand, after the glue filling is completed, the structural glue 4 solidifies in the glue overflow groove 216, and a second limiting column 43 will be formed, which cooperates with the first limiting column 41 formed by the structural glue 4 solidifying in the glue guide groove 213, so as to strengthen the strength of limiting the single battery 1 accommodated in the receiving cavity. Among them, the number of the glue overflow grooves 216 can be freely set according to the needs. In this embodiment, the number of the glue overflow grooves 216 and the number of the glue guide grooves 213 are consistent, and two are provided.

[0045] Alternatively, if Figure 3 , Figure 4 , Figure 5 As shown, the overflowing glue groove 216 and the glue guiding groove 213 are symmetrically distributed on the groove wall of the receiving groove 211. By symmetrically distributing the overflowing glue groove 216 and the glue guiding groove 213 on the groove wall of the receiving groove 211, the first limiting pillar 41 and the second limiting pillar 43 formed after the structural glue 4 solidifies in the overflowing glue groove 216 and the glue guiding groove 213 are evenly distributed on the outside of the single battery 1, thereby ensuring the uniformity of the force applied to the single battery 1.

[0046] Alternatively, if Figure 6 As shown, the protective end cover 22 is also provided with an exhaust cavity 223 that passes through the abutment portion 222, and a weakening structure 224 is provided on the side of the closing portion 221 facing the abutment portion 222. The thickness of the weakening structure 224 is less than the thickness of other parts of the protective end cover 22, and the weakening structure 224 is located in the area of ​​the closing portion 221 covered by the exhaust cavity 223. By providing an exhaust cavity 223 penetrating the abutment portion 222 on the protective end cover 22, when the single cell 1 has thermal runaway, the exhaust cavity 223 is used to guide the high-pressure and high-temperature gas rushing out of the single cell 1, and a weakening structure 224 is provided in the area of ​​the abutment portion 222 covered by the exhaust cavity 223. Since the thickness of the weakening structure 224 is less than the thickness of other parts of the protective end cover 22, the structural strength at the weakening structure 224 is relatively weak, so that the high-temperature and high-pressure gas can be discharged into the external environment by breaking through the weakening structure 224, and when the temperature and pressure of the high-temperature and high-pressure gas are relatively high, the high-temperature and high-pressure gas will also melt the bottom rubber ring 42 located outside the abutment portion 222, resulting in a reduction in the strength of the connection between the protective end cover 22 and the lower box body 21, so that when the weakening structure 224 does not meet the discharge requirements, the high-temperature and high-pressure gas can directly break through the protective end cover 22 to further improve the discharge capacity, thereby playing a double protection role. In this embodiment, the weakening structure 224 is an annular groove provided on the closed portion 221.

[0047] Optionally, the electric control module 3 includes a collection board group 31 and a BMS assembly 32, wherein the BMS assembly 32 is disposed on the upper surface of the lower box 21, a portion of the collection board group 31 is integrated on the upper surface of the lower box 21 and is electrically connected to the BMS assembly 32, and another portion of the collection board group 31 is accommodated in the limiting groove 212 and is electrically connected to the single cell 1. By accommodating the collection board group 31 for collecting information of the single cell 1 in the limiting groove 212, the position of the collection board group 31 is fixed after the injection of glue, thereby preventing the collection board group 31 from being dislocated due to external factors, resulting in the inability to accurately obtain the information of the single cell 1.

[0048] In this embodiment, the acquisition board group 31 includes a series bar 311, a BMS positive input bar 312, a BMS positive output bar 313, a BMS negative input bar 314 and a BMS negative output bar 315, wherein the series bar 311 is used to realize the conduction of multiple single cells 1, and the BMS positive input bar 312 and the BMS negative input bar 314 are both used to connect the series bar 311 with the BMS assembly 32, and then the BMS positive output bar 313 and the BMS negative output bar 315 connect the BMS assembly 32 with external devices. In addition, the acquisition board group 31 and the lower box 21 are injection molded into an integrated structure, so that the acquisition board group 31 and the lower box 21 are integrated into one by the injection molding process, and the receiving groove 211, the limit groove 212 and the glue injection structure connecting the limit groove 212 and the receiving cavity can also be directly constructed on the lower box 21.

[0049] Alternatively, if Figure 7 As shown, the electric control module 3 also includes a temperature sensor 33. A mounting through hole is provided on one side of the lower case 21 facing the BMS assembly 32. One side of the temperature sensor 33 is connected to the BMS assembly 32, and the other side of the temperature sensor 33 passes through the mounting through hole and abuts against the single battery 1. By integrating the temperature sensor 33 on the BMS assembly 32 and passing the other end of the temperature sensor 33 directly through the mounting through hole on the lower case 21, the temperature of the single battery 1 is directly collected, the connection harness is omitted, the connection cost is reduced, and the space requirement is reduced, making the structure more compact.

[0050] In this embodiment, a thermally conductive structural adhesive is applied to the side of the temperature sensor 33 that contacts the single cell 1 , which can not only connect and fix the temperature sensor 33 to the single cell 1 , but also quickly transfer the heat from the single cell 1 to the temperature sensor 33 through the thermally conductive structural adhesive.

[0051] Alternatively, if Figure 1As shown, the box assembly 2 also includes a box upper cover 23, which is arranged on the side of the BMS assembly 32 facing away from the lower box 21, and a mounting slot 217 is provided on the side of the lower box 21 facing the box upper cover 23, and a plug-in protrusion 231 is provided on the side of the box upper cover 23 facing the lower box 21, and the plug-in protrusion 231 is inserted into the mounting slot 217. On the one hand, a box upper cover 23 is provided on the side of the BMS assembly 32 facing away from the lower box 21, so as to protect the BMS assembly 32 and prevent the BMS assembly 32 from being exposed to the outside and damaged. On the other hand, a mounting slot 217 is provided on the lower box 21, and a plug-in protrusion 231 is provided on the box upper cover 23, so that the plug-in protrusion 231 is plugged into the mounting slot 217, thereby assembling the lower box 21 and the box upper cover 23 conveniently, and the lower box 21 and the box upper cover 23 are connected more tightly, thereby improving the sealing after the two are connected.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A power battery pack, characterized in that: The power battery pack comprises: A plurality of single cells (1); A box assembly (2), the box assembly (2) comprising a lower box (21) and a protective end cover (22), one side of the lower box (21) being provided with accommodating grooves (211) corresponding to a plurality of the single cells (1) and being independent of each other, the protective end cover (22) being arranged at the opening of the accommodating groove (211) to close the accommodating groove (211) so as to form an accommodating cavity for accommodating the single cells (1) along the axial direction, the side of the lower box (21) facing away from the protective end cover (22) being provided with a limiting groove (212) corresponding to the accommodating cavity, the lower box (21) being provided with a glue injection structure, the glue injection structure being used to connect the limiting groove (212) with the accommodating cavity; An electric control module (3), the electric control module (3) being arranged on the lower box body (21), a part of the electric control module (3) being accommodated in the limiting groove (212), and the electric control module (3) being used to manage the plurality of single cells (1).

2. The power battery pack according to claim 1, characterized in that: The glue pouring structure comprises a glue guiding groove (213), a glue injection port (214) and a communication port (215); the glue guiding groove (213) is arranged on the groove wall of the containing groove (211); the glue injection port (214) and the communication port (215) are both arranged in the limiting groove (212); the glue injection port (214) is used to connect the limiting groove (212) and the containing cavity; the communication port (215) is used to connect the limiting groove (212) and the glue guiding groove (213).

3. The power battery pack according to claim 2, characterized in that: The protective end cover (22) comprises a closing portion (221) and an abutting portion (222); the closing portion (221) is arranged at the opening of the receiving groove (211) to close the receiving groove (211); the abutting portion (222) is inserted into the receiving groove (211) to abut against the single battery (1); a glue bin connected to the glue guide groove (213) is formed between the abutting portion (222) and the groove wall of the receiving groove (211).

4. The power battery pack according to claim 3, characterized in that: The glue pouring structure further comprises a glue overflow groove (216), wherein the glue overflow groove (216) is arranged on the groove wall of the containing groove (211) and is connected to the glue bin.

5. The power battery pack according to claim 4, characterized in that: The glue overflow groove (216) and the glue guide groove (213) are symmetrically distributed on the groove wall of the containing groove (211).

6. The power battery pack according to claim 3, characterized in that: The protective end cover (22) is also provided with an exhaust cavity (223) penetrating the abutting portion (222); a weakening structure (224) is provided on the side of the closing portion (221) facing the abutting portion (222); the thickness of the weakening structure (224) is smaller than the thickness of other parts of the protective end cover (22); and the weakening structure (224) is located in the area of ​​the closing portion (221) covered by the exhaust cavity (223).

7. The power battery pack according to claim 1, characterized in that: The electric control module (3) comprises a collection board group (31) and a BMS assembly (32); the BMS assembly (32) is arranged on the upper surface of the lower box (21); a portion of the collection board group (31) is integrated on the upper surface of the lower box (21) and is electrically connected to the BMS assembly (32); another portion of the collection board group (31) is accommodated in the limiting groove (212) and is electrically connected to the single battery (1).

8. The power battery pack according to claim 7, characterized in that: The electric control module (3) further comprises a temperature sensor (33); a mounting through hole is provided on a side of the lower box (21) facing the BMS assembly (32); one side of the temperature sensor (33) is connected to the BMS assembly (32); and the other side of the temperature sensor (33) passes through the mounting through hole and abuts against the single battery (1).

9. The power battery pack according to claim 7, characterized in that: The box assembly (2) further comprises a box upper cover (23), wherein the box upper cover (23) is arranged on a side of the BMS assembly (32) facing away from the lower box (21), a mounting slot (217) is provided on a side of the lower box (21) facing the box upper cover (23), and a plug-in protrusion (231) is provided on a side of the box upper cover (23) facing the lower box (21), and the plug-in protrusion (231) is inserted into the mounting slot (217).

10. The power battery pack according to claim 7, characterized in that: The collection plate group (31) and the lower box body (21) are injection-molded and integrated into an integral structure.

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